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- // aarch64.cc -- aarch64 target support for gold.
- // Copyright (C) 2014-2022 Free Software Foundation, Inc.
- // Written by Jing Yu <jingyu@google.com> and Han Shen <shenhan@google.com>.
- // This file is part of gold.
- // This program is free software; you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation; either version 3 of the License, or
- // (at your option) any later version.
- // This program is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- // You should have received a copy of the GNU General Public License
- // along with this program; if not, write to the Free Software
- // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
- // MA 02110-1301, USA.
- #include "gold.h"
- #include <cstring>
- #include <map>
- #include <set>
- #include "elfcpp.h"
- #include "dwarf.h"
- #include "parameters.h"
- #include "reloc.h"
- #include "aarch64.h"
- #include "object.h"
- #include "symtab.h"
- #include "layout.h"
- #include "output.h"
- #include "copy-relocs.h"
- #include "target.h"
- #include "target-reloc.h"
- #include "target-select.h"
- #include "tls.h"
- #include "freebsd.h"
- #include "nacl.h"
- #include "gc.h"
- #include "icf.h"
- #include "aarch64-reloc-property.h"
- // The first three .got.plt entries are reserved.
- const int32_t AARCH64_GOTPLT_RESERVE_COUNT = 3;
- namespace
- {
- using namespace gold;
- template<int size, bool big_endian>
- class Output_data_plt_aarch64;
- template<int size, bool big_endian>
- class Output_data_plt_aarch64_standard;
- template<int size, bool big_endian>
- class Target_aarch64;
- template<int size, bool big_endian>
- class AArch64_relocate_functions;
- // Utility class dealing with insns. This is ported from macros in
- // bfd/elfnn-aarch64.cc, but wrapped inside a class as static members. This
- // class is used in erratum sequence scanning.
- template<bool big_endian>
- class AArch64_insn_utilities
- {
- public:
- typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
- static const int BYTES_PER_INSN;
- // Zero register encoding - 31.
- static const unsigned int AARCH64_ZR;
- static unsigned int
- aarch64_bit(Insntype insn, int pos)
- { return ((1 << pos) & insn) >> pos; }
- static unsigned int
- aarch64_bits(Insntype insn, int pos, int l)
- { return (insn >> pos) & ((1 << l) - 1); }
- // Get the encoding field "op31" of 3-source data processing insns. "op31" is
- // the name defined in armv8 insn manual C3.5.9.
- static unsigned int
- aarch64_op31(Insntype insn)
- { return aarch64_bits(insn, 21, 3); }
- // Get the encoding field "ra" of 3-source data processing insns. "ra" is the
- // third source register. See armv8 insn manual C3.5.9.
- static unsigned int
- aarch64_ra(Insntype insn)
- { return aarch64_bits(insn, 10, 5); }
- static bool
- is_adr(const Insntype insn)
- { return (insn & 0x9F000000) == 0x10000000; }
- static bool
- is_adrp(const Insntype insn)
- { return (insn & 0x9F000000) == 0x90000000; }
- static bool
- is_mrs_tpidr_el0(const Insntype insn)
- { return (insn & 0xFFFFFFE0) == 0xd53bd040; }
- static unsigned int
- aarch64_rm(const Insntype insn)
- { return aarch64_bits(insn, 16, 5); }
- static unsigned int
- aarch64_rn(const Insntype insn)
- { return aarch64_bits(insn, 5, 5); }
- static unsigned int
- aarch64_rd(const Insntype insn)
- { return aarch64_bits(insn, 0, 5); }
- static unsigned int
- aarch64_rt(const Insntype insn)
- { return aarch64_bits(insn, 0, 5); }
- static unsigned int
- aarch64_rt2(const Insntype insn)
- { return aarch64_bits(insn, 10, 5); }
- // Encode imm21 into adr. Signed imm21 is in the range of [-1M, 1M).
- static Insntype
- aarch64_adr_encode_imm(Insntype adr, int imm21)
- {
- gold_assert(is_adr(adr));
- gold_assert(-(1 << 20) <= imm21 && imm21 < (1 << 20));
- const int mask19 = (1 << 19) - 1;
- const int mask2 = 3;
- adr &= ~((mask19 << 5) | (mask2 << 29));
- adr |= ((imm21 & mask2) << 29) | (((imm21 >> 2) & mask19) << 5);
- return adr;
- }
- // Retrieve encoded adrp 33-bit signed imm value. This value is obtained by
- // 21-bit signed imm encoded in the insn multiplied by 4k (page size) and
- // 64-bit sign-extended, resulting in [-4G, 4G) with 12-lsb being 0.
- static int64_t
- aarch64_adrp_decode_imm(const Insntype adrp)
- {
- const int mask19 = (1 << 19) - 1;
- const int mask2 = 3;
- gold_assert(is_adrp(adrp));
- // 21-bit imm encoded in adrp.
- uint64_t imm = ((adrp >> 29) & mask2) | (((adrp >> 5) & mask19) << 2);
- // Retrieve msb of 21-bit-signed imm for sign extension.
- uint64_t msbt = (imm >> 20) & 1;
- // Real value is imm multiplied by 4k. Value now has 33-bit information.
- int64_t value = imm << 12;
- // Sign extend to 64-bit by repeating msbt 31 (64-33) times and merge it
- // with value.
- return ((((uint64_t)(1) << 32) - msbt) << 33) | value;
- }
- static bool
- aarch64_b(const Insntype insn)
- { return (insn & 0xFC000000) == 0x14000000; }
- static bool
- aarch64_bl(const Insntype insn)
- { return (insn & 0xFC000000) == 0x94000000; }
- static bool
- aarch64_blr(const Insntype insn)
- { return (insn & 0xFFFFFC1F) == 0xD63F0000; }
- static bool
- aarch64_br(const Insntype insn)
- { return (insn & 0xFFFFFC1F) == 0xD61F0000; }
- // All ld/st ops. See C4-182 of the ARM ARM. The encoding space for
- // LD_PCREL, LDST_RO, LDST_UI and LDST_UIMM cover prefetch ops.
- static bool
- aarch64_ld(Insntype insn) { return aarch64_bit(insn, 22) == 1; }
- static bool
- aarch64_ldst(Insntype insn)
- { return (insn & 0x0a000000) == 0x08000000; }
- static bool
- aarch64_ldst_ex(Insntype insn)
- { return (insn & 0x3f000000) == 0x08000000; }
- static bool
- aarch64_ldst_pcrel(Insntype insn)
- { return (insn & 0x3b000000) == 0x18000000; }
- static bool
- aarch64_ldst_nap(Insntype insn)
- { return (insn & 0x3b800000) == 0x28000000; }
- static bool
- aarch64_ldstp_pi(Insntype insn)
- { return (insn & 0x3b800000) == 0x28800000; }
- static bool
- aarch64_ldstp_o(Insntype insn)
- { return (insn & 0x3b800000) == 0x29000000; }
- static bool
- aarch64_ldstp_pre(Insntype insn)
- { return (insn & 0x3b800000) == 0x29800000; }
- static bool
- aarch64_ldst_ui(Insntype insn)
- { return (insn & 0x3b200c00) == 0x38000000; }
- static bool
- aarch64_ldst_piimm(Insntype insn)
- { return (insn & 0x3b200c00) == 0x38000400; }
- static bool
- aarch64_ldst_u(Insntype insn)
- { return (insn & 0x3b200c00) == 0x38000800; }
- static bool
- aarch64_ldst_preimm(Insntype insn)
- { return (insn & 0x3b200c00) == 0x38000c00; }
- static bool
- aarch64_ldst_ro(Insntype insn)
- { return (insn & 0x3b200c00) == 0x38200800; }
- static bool
- aarch64_ldst_uimm(Insntype insn)
- { return (insn & 0x3b000000) == 0x39000000; }
- static bool
- aarch64_ldst_simd_m(Insntype insn)
- { return (insn & 0xbfbf0000) == 0x0c000000; }
- static bool
- aarch64_ldst_simd_m_pi(Insntype insn)
- { return (insn & 0xbfa00000) == 0x0c800000; }
- static bool
- aarch64_ldst_simd_s(Insntype insn)
- { return (insn & 0xbf9f0000) == 0x0d000000; }
- static bool
- aarch64_ldst_simd_s_pi(Insntype insn)
- { return (insn & 0xbf800000) == 0x0d800000; }
- // Classify an INSN if it is indeed a load/store. Return true if INSN is a
- // LD/ST instruction otherwise return false. For scalar LD/ST instructions
- // PAIR is FALSE, RT is returned and RT2 is set equal to RT. For LD/ST pair
- // instructions PAIR is TRUE, RT and RT2 are returned.
- static bool
- aarch64_mem_op_p(Insntype insn, unsigned int *rt, unsigned int *rt2,
- bool *pair, bool *load)
- {
- uint32_t opcode;
- unsigned int r;
- uint32_t opc = 0;
- uint32_t v = 0;
- uint32_t opc_v = 0;
- /* Bail out quickly if INSN doesn't fall into the load-store
- encoding space. */
- if (!aarch64_ldst (insn))
- return false;
- *pair = false;
- *load = false;
- if (aarch64_ldst_ex (insn))
- {
- *rt = aarch64_rt (insn);
- *rt2 = *rt;
- if (aarch64_bit (insn, 21) == 1)
- {
- *pair = true;
- *rt2 = aarch64_rt2 (insn);
- }
- *load = aarch64_ld (insn);
- return true;
- }
- else if (aarch64_ldst_nap (insn)
- || aarch64_ldstp_pi (insn)
- || aarch64_ldstp_o (insn)
- || aarch64_ldstp_pre (insn))
- {
- *pair = true;
- *rt = aarch64_rt (insn);
- *rt2 = aarch64_rt2 (insn);
- *load = aarch64_ld (insn);
- return true;
- }
- else if (aarch64_ldst_pcrel (insn)
- || aarch64_ldst_ui (insn)
- || aarch64_ldst_piimm (insn)
- || aarch64_ldst_u (insn)
- || aarch64_ldst_preimm (insn)
- || aarch64_ldst_ro (insn)
- || aarch64_ldst_uimm (insn))
- {
- *rt = aarch64_rt (insn);
- *rt2 = *rt;
- if (aarch64_ldst_pcrel (insn))
- *load = true;
- opc = aarch64_bits (insn, 22, 2);
- v = aarch64_bit (insn, 26);
- opc_v = opc | (v << 2);
- *load = (opc_v == 1 || opc_v == 2 || opc_v == 3
- || opc_v == 5 || opc_v == 7);
- return true;
- }
- else if (aarch64_ldst_simd_m (insn)
- || aarch64_ldst_simd_m_pi (insn))
- {
- *rt = aarch64_rt (insn);
- *load = aarch64_bit (insn, 22);
- opcode = (insn >> 12) & 0xf;
- switch (opcode)
- {
- case 0:
- case 2:
- *rt2 = *rt + 3;
- break;
- case 4:
- case 6:
- *rt2 = *rt + 2;
- break;
- case 7:
- *rt2 = *rt;
- break;
- case 8:
- case 10:
- *rt2 = *rt + 1;
- break;
- default:
- return false;
- }
- return true;
- }
- else if (aarch64_ldst_simd_s (insn)
- || aarch64_ldst_simd_s_pi (insn))
- {
- *rt = aarch64_rt (insn);
- r = (insn >> 21) & 1;
- *load = aarch64_bit (insn, 22);
- opcode = (insn >> 13) & 0x7;
- switch (opcode)
- {
- case 0:
- case 2:
- case 4:
- *rt2 = *rt + r;
- break;
- case 1:
- case 3:
- case 5:
- *rt2 = *rt + (r == 0 ? 2 : 3);
- break;
- case 6:
- *rt2 = *rt + r;
- break;
- case 7:
- *rt2 = *rt + (r == 0 ? 2 : 3);
- break;
- default:
- return false;
- }
- return true;
- }
- return false;
- } // End of "aarch64_mem_op_p".
- // Return true if INSN is mac insn.
- static bool
- aarch64_mac(Insntype insn)
- { return (insn & 0xff000000) == 0x9b000000; }
- // Return true if INSN is multiply-accumulate.
- // (This is similar to implementaton in elfnn-aarch64.c.)
- static bool
- aarch64_mlxl(Insntype insn)
- {
- uint32_t op31 = aarch64_op31(insn);
- if (aarch64_mac(insn)
- && (op31 == 0 || op31 == 1 || op31 == 5)
- /* Exclude MUL instructions which are encoded as a multiple-accumulate
- with RA = XZR. */
- && aarch64_ra(insn) != AARCH64_ZR)
- {
- return true;
- }
- return false;
- }
- }; // End of "AArch64_insn_utilities".
- // Insn length in byte.
- template<bool big_endian>
- const int AArch64_insn_utilities<big_endian>::BYTES_PER_INSN = 4;
- // Zero register encoding - 31.
- template<bool big_endian>
- const unsigned int AArch64_insn_utilities<big_endian>::AARCH64_ZR = 0x1f;
- // Output_data_got_aarch64 class.
- template<int size, bool big_endian>
- class Output_data_got_aarch64 : public Output_data_got<size, big_endian>
- {
- public:
- typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
- Output_data_got_aarch64(Symbol_table* symtab, Layout* layout)
- : Output_data_got<size, big_endian>(),
- symbol_table_(symtab), layout_(layout)
- { }
- // Add a static entry for the GOT entry at OFFSET. GSYM is a global
- // symbol and R_TYPE is the code of a dynamic relocation that needs to be
- // applied in a static link.
- void
- add_static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym)
- { this->static_relocs_.push_back(Static_reloc(got_offset, r_type, gsym)); }
- // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object
- // defining a local symbol with INDEX. R_TYPE is the code of a dynamic
- // relocation that needs to be applied in a static link.
- void
- add_static_reloc(unsigned int got_offset, unsigned int r_type,
- Sized_relobj_file<size, big_endian>* relobj,
- unsigned int index)
- {
- this->static_relocs_.push_back(Static_reloc(got_offset, r_type, relobj,
- index));
- }
- protected:
- // Write out the GOT table.
- void
- do_write(Output_file* of) {
- // The first entry in the GOT is the address of the .dynamic section.
- gold_assert(this->data_size() >= size / 8);
- Output_section* dynamic = this->layout_->dynamic_section();
- Valtype dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
- this->replace_constant(0, dynamic_addr);
- Output_data_got<size, big_endian>::do_write(of);
- // Handling static relocs
- if (this->static_relocs_.empty())
- return;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
- gold_assert(parameters->doing_static_link());
- const off_t offset = this->offset();
- const section_size_type oview_size =
- convert_to_section_size_type(this->data_size());
- unsigned char* const oview = of->get_output_view(offset, oview_size);
- Output_segment* tls_segment = this->layout_->tls_segment();
- gold_assert(tls_segment != NULL);
- AArch64_address aligned_tcb_address =
- align_address(Target_aarch64<size, big_endian>::TCB_SIZE,
- tls_segment->maximum_alignment());
- for (size_t i = 0; i < this->static_relocs_.size(); ++i)
- {
- Static_reloc& reloc(this->static_relocs_[i]);
- AArch64_address value;
- if (!reloc.symbol_is_global())
- {
- Sized_relobj_file<size, big_endian>* object = reloc.relobj();
- const Symbol_value<size>* psymval =
- reloc.relobj()->local_symbol(reloc.index());
- // We are doing static linking. Issue an error and skip this
- // relocation if the symbol is undefined or in a discarded_section.
- bool is_ordinary;
- unsigned int shndx = psymval->input_shndx(&is_ordinary);
- if ((shndx == elfcpp::SHN_UNDEF)
- || (is_ordinary
- && shndx != elfcpp::SHN_UNDEF
- && !object->is_section_included(shndx)
- && !this->symbol_table_->is_section_folded(object, shndx)))
- {
- gold_error(_("undefined or discarded local symbol %u from "
- " object %s in GOT"),
- reloc.index(), reloc.relobj()->name().c_str());
- continue;
- }
- value = psymval->value(object, 0);
- }
- else
- {
- const Symbol* gsym = reloc.symbol();
- gold_assert(gsym != NULL);
- if (gsym->is_forwarder())
- gsym = this->symbol_table_->resolve_forwards(gsym);
- // We are doing static linking. Issue an error and skip this
- // relocation if the symbol is undefined or in a discarded_section
- // unless it is a weakly_undefined symbol.
- if ((gsym->is_defined_in_discarded_section()
- || gsym->is_undefined())
- && !gsym->is_weak_undefined())
- {
- gold_error(_("undefined or discarded symbol %s in GOT"),
- gsym->name());
- continue;
- }
- if (!gsym->is_weak_undefined())
- {
- const Sized_symbol<size>* sym =
- static_cast<const Sized_symbol<size>*>(gsym);
- value = sym->value();
- }
- else
- value = 0;
- }
- unsigned got_offset = reloc.got_offset();
- gold_assert(got_offset < oview_size);
- typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype;
- Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset);
- Valtype x;
- switch (reloc.r_type())
- {
- case elfcpp::R_AARCH64_TLS_DTPREL64:
- x = value;
- break;
- case elfcpp::R_AARCH64_TLS_TPREL64:
- x = value + aligned_tcb_address;
- break;
- default:
- gold_unreachable();
- }
- elfcpp::Swap<size, big_endian>::writeval(wv, x);
- }
- of->write_output_view(offset, oview_size, oview);
- }
- private:
- // Symbol table of the output object.
- Symbol_table* symbol_table_;
- // A pointer to the Layout class, so that we can find the .dynamic
- // section when we write out the GOT section.
- Layout* layout_;
- // This class represent dynamic relocations that need to be applied by
- // gold because we are using TLS relocations in a static link.
- class Static_reloc
- {
- public:
- Static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym)
- : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(true)
- { this->u_.global.symbol = gsym; }
- Static_reloc(unsigned int got_offset, unsigned int r_type,
- Sized_relobj_file<size, big_endian>* relobj, unsigned int index)
- : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(false)
- {
- this->u_.local.relobj = relobj;
- this->u_.local.index = index;
- }
- // Return the GOT offset.
- unsigned int
- got_offset() const
- { return this->got_offset_; }
- // Relocation type.
- unsigned int
- r_type() const
- { return this->r_type_; }
- // Whether the symbol is global or not.
- bool
- symbol_is_global() const
- { return this->symbol_is_global_; }
- // For a relocation against a global symbol, the global symbol.
- Symbol*
- symbol() const
- {
- gold_assert(this->symbol_is_global_);
- return this->u_.global.symbol;
- }
- // For a relocation against a local symbol, the defining object.
- Sized_relobj_file<size, big_endian>*
- relobj() const
- {
- gold_assert(!this->symbol_is_global_);
- return this->u_.local.relobj;
- }
- // For a relocation against a local symbol, the local symbol index.
- unsigned int
- index() const
- {
- gold_assert(!this->symbol_is_global_);
- return this->u_.local.index;
- }
- private:
- // GOT offset of the entry to which this relocation is applied.
- unsigned int got_offset_;
- // Type of relocation.
- unsigned int r_type_;
- // Whether this relocation is against a global symbol.
- bool symbol_is_global_;
- // A global or local symbol.
- union
- {
- struct
- {
- // For a global symbol, the symbol itself.
- Symbol* symbol;
- } global;
- struct
- {
- // For a local symbol, the object defining the symbol.
- Sized_relobj_file<size, big_endian>* relobj;
- // For a local symbol, the symbol index.
- unsigned int index;
- } local;
- } u_;
- }; // End of inner class Static_reloc
- std::vector<Static_reloc> static_relocs_;
- }; // End of Output_data_got_aarch64
- template<int size, bool big_endian>
- class AArch64_input_section;
- template<int size, bool big_endian>
- class AArch64_output_section;
- template<int size, bool big_endian>
- class AArch64_relobj;
- // Stub type enum constants.
- enum
- {
- ST_NONE = 0,
- // Using adrp/add pair, 4 insns (including alignment) without mem access,
- // the fastest stub. This has a limited jump distance, which is tested by
- // aarch64_valid_for_adrp_p.
- ST_ADRP_BRANCH = 1,
- // Using ldr-absolute-address/br-register, 4 insns with 1 mem access,
- // unlimited in jump distance.
- ST_LONG_BRANCH_ABS = 2,
- // Using ldr/calculate-pcrel/jump, 8 insns (including alignment) with 1
- // mem access, slowest one. Only used in position independent executables.
- ST_LONG_BRANCH_PCREL = 3,
- // Stub for erratum 843419 handling.
- ST_E_843419 = 4,
- // Stub for erratum 835769 handling.
- ST_E_835769 = 5,
- // Number of total stub types.
- ST_NUMBER = 6
- };
- // Struct that wraps insns for a particular stub. All stub templates are
- // created/initialized as constants by Stub_template_repertoire.
- template<bool big_endian>
- struct Stub_template
- {
- const typename AArch64_insn_utilities<big_endian>::Insntype* insns;
- const int insn_num;
- };
- // Simple singleton class that creates/initializes/stores all types of stub
- // templates.
- template<bool big_endian>
- class Stub_template_repertoire
- {
- public:
- typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
- // Single static method to get stub template for a given stub type.
- static const Stub_template<big_endian>*
- get_stub_template(int type)
- {
- static Stub_template_repertoire<big_endian> singleton;
- return singleton.stub_templates_[type];
- }
- private:
- // Constructor - creates/initializes all stub templates.
- Stub_template_repertoire();
- ~Stub_template_repertoire()
- { }
- // Disallowing copy ctor and copy assignment operator.
- Stub_template_repertoire(Stub_template_repertoire&);
- Stub_template_repertoire& operator=(Stub_template_repertoire&);
- // Data that stores all insn templates.
- const Stub_template<big_endian>* stub_templates_[ST_NUMBER];
- }; // End of "class Stub_template_repertoire".
- // Constructor - creates/initilizes all stub templates.
- template<bool big_endian>
- Stub_template_repertoire<big_endian>::Stub_template_repertoire()
- {
- // Insn array definitions.
- const static Insntype ST_NONE_INSNS[] = {};
- const static Insntype ST_ADRP_BRANCH_INSNS[] =
- {
- 0x90000010, /* adrp ip0, X */
- /* ADR_PREL_PG_HI21(X) */
- 0x91000210, /* add ip0, ip0, :lo12:X */
- /* ADD_ABS_LO12_NC(X) */
- 0xd61f0200, /* br ip0 */
- 0x00000000, /* alignment padding */
- };
- const static Insntype ST_LONG_BRANCH_ABS_INSNS[] =
- {
- 0x58000050, /* ldr ip0, 0x8 */
- 0xd61f0200, /* br ip0 */
- 0x00000000, /* address field */
- 0x00000000, /* address fields */
- };
- const static Insntype ST_LONG_BRANCH_PCREL_INSNS[] =
- {
- 0x58000090, /* ldr ip0, 0x10 */
- 0x10000011, /* adr ip1, #0 */
- 0x8b110210, /* add ip0, ip0, ip1 */
- 0xd61f0200, /* br ip0 */
- 0x00000000, /* address field */
- 0x00000000, /* address field */
- 0x00000000, /* alignment padding */
- 0x00000000, /* alignment padding */
- };
- const static Insntype ST_E_843419_INSNS[] =
- {
- 0x00000000, /* Placeholder for erratum insn. */
- 0x14000000, /* b <label> */
- };
- // ST_E_835769 has the same stub template as ST_E_843419
- // but we reproduce the array here so that the sizeof
- // expressions in install_insn_template will work.
- const static Insntype ST_E_835769_INSNS[] =
- {
- 0x00000000, /* Placeholder for erratum insn. */
- 0x14000000, /* b <label> */
- };
- #define install_insn_template(T) \
- const static Stub_template<big_endian> template_##T = { \
- T##_INSNS, sizeof(T##_INSNS) / sizeof(T##_INSNS[0]) }; \
- this->stub_templates_[T] = &template_##T
- install_insn_template(ST_NONE);
- install_insn_template(ST_ADRP_BRANCH);
- install_insn_template(ST_LONG_BRANCH_ABS);
- install_insn_template(ST_LONG_BRANCH_PCREL);
- install_insn_template(ST_E_843419);
- install_insn_template(ST_E_835769);
- #undef install_insn_template
- }
- // Base class for stubs.
- template<int size, bool big_endian>
- class Stub_base
- {
- public:
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
- typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
- static const AArch64_address invalid_address =
- static_cast<AArch64_address>(-1);
- static const section_offset_type invalid_offset =
- static_cast<section_offset_type>(-1);
- Stub_base(int type)
- : destination_address_(invalid_address),
- offset_(invalid_offset),
- type_(type)
- {}
- ~Stub_base()
- {}
- // Get stub type.
- int
- type() const
- { return this->type_; }
- // Get stub template that provides stub insn information.
- const Stub_template<big_endian>*
- stub_template() const
- {
- return Stub_template_repertoire<big_endian>::
- get_stub_template(this->type());
- }
- // Get destination address.
- AArch64_address
- destination_address() const
- {
- gold_assert(this->destination_address_ != this->invalid_address);
- return this->destination_address_;
- }
- // Set destination address.
- void
- set_destination_address(AArch64_address address)
- {
- gold_assert(address != this->invalid_address);
- this->destination_address_ = address;
- }
- // Reset the destination address.
- void
- reset_destination_address()
- { this->destination_address_ = this->invalid_address; }
- // Get offset of code stub. For Reloc_stub, it is the offset from the
- // beginning of its containing stub table; for Erratum_stub, it is the offset
- // from the end of reloc_stubs.
- section_offset_type
- offset() const
- {
- gold_assert(this->offset_ != this->invalid_offset);
- return this->offset_;
- }
- // Set stub offset.
- void
- set_offset(section_offset_type offset)
- { this->offset_ = offset; }
- // Return the stub insn.
- const Insntype*
- insns() const
- { return this->stub_template()->insns; }
- // Return num of stub insns.
- unsigned int
- insn_num() const
- { return this->stub_template()->insn_num; }
- // Get size of the stub.
- int
- stub_size() const
- {
- return this->insn_num() *
- AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
- }
- // Write stub to output file.
- void
- write(unsigned char* view, section_size_type view_size)
- { this->do_write(view, view_size); }
- protected:
- // Abstract method to be implemented by sub-classes.
- virtual void
- do_write(unsigned char*, section_size_type) = 0;
- private:
- // The last insn of a stub is a jump to destination insn. This field records
- // the destination address.
- AArch64_address destination_address_;
- // The stub offset. Note this has difference interpretations between an
- // Reloc_stub and an Erratum_stub. For Reloc_stub this is the offset from the
- // beginning of the containing stub_table, whereas for Erratum_stub, this is
- // the offset from the end of reloc_stubs.
- section_offset_type offset_;
- // Stub type.
- const int type_;
- }; // End of "Stub_base".
- // Erratum stub class. An erratum stub differs from a reloc stub in that for
- // each erratum occurrence, we generate an erratum stub. We never share erratum
- // stubs, whereas for reloc stubs, different branch insns share a single reloc
- // stub as long as the branch targets are the same. (More to the point, reloc
- // stubs can be shared because they're used to reach a specific target, whereas
- // erratum stubs branch back to the original control flow.)
- template<int size, bool big_endian>
- class Erratum_stub : public Stub_base<size, big_endian>
- {
- public:
- typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
- typedef AArch64_insn_utilities<big_endian> Insn_utilities;
- typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
- static const int STUB_ADDR_ALIGN;
- static const Insntype invalid_insn = static_cast<Insntype>(-1);
- Erratum_stub(The_aarch64_relobj* relobj, int type,
- unsigned shndx, unsigned int sh_offset)
- : Stub_base<size, big_endian>(type), relobj_(relobj),
- shndx_(shndx), sh_offset_(sh_offset),
- erratum_insn_(invalid_insn),
- erratum_address_(this->invalid_address)
- {}
- ~Erratum_stub() {}
- // Return the object that contains the erratum.
- The_aarch64_relobj*
- relobj()
- { return this->relobj_; }
- // Get section index of the erratum.
- unsigned int
- shndx() const
- { return this->shndx_; }
- // Get section offset of the erratum.
- unsigned int
- sh_offset() const
- { return this->sh_offset_; }
- // Get the erratum insn. This is the insn located at erratum_insn_address.
- Insntype
- erratum_insn() const
- {
- gold_assert(this->erratum_insn_ != this->invalid_insn);
- return this->erratum_insn_;
- }
- // Set the insn that the erratum happens to.
- void
- set_erratum_insn(Insntype insn)
- { this->erratum_insn_ = insn; }
- // For 843419, the erratum insn is ld/st xt, [xn, #uimm], which may be a
- // relocation spot, in this case, the erratum_insn_ recorded at scanning phase
- // is no longer the one we want to write out to the stub, update erratum_insn_
- // with relocated version. Also note that in this case xn must not be "PC", so
- // it is safe to move the erratum insn from the origin place to the stub. For
- // 835769, the erratum insn is multiply-accumulate insn, which could not be a
- // relocation spot (assertion added though).
- void
- update_erratum_insn(Insntype insn)
- {
- gold_assert(this->erratum_insn_ != this->invalid_insn);
- switch (this->type())
- {
- case ST_E_843419:
- gold_assert(Insn_utilities::aarch64_ldst_uimm(insn));
- gold_assert(Insn_utilities::aarch64_ldst_uimm(this->erratum_insn()));
- gold_assert(Insn_utilities::aarch64_rd(insn) ==
- Insn_utilities::aarch64_rd(this->erratum_insn()));
- gold_assert(Insn_utilities::aarch64_rn(insn) ==
- Insn_utilities::aarch64_rn(this->erratum_insn()));
- // Update plain ld/st insn with relocated insn.
- this->erratum_insn_ = insn;
- break;
- case ST_E_835769:
- gold_assert(insn == this->erratum_insn());
- break;
- default:
- gold_unreachable();
- }
- }
- // Return the address where an erratum must be done.
- AArch64_address
- erratum_address() const
- {
- gold_assert(this->erratum_address_ != this->invalid_address);
- return this->erratum_address_;
- }
- // Set the address where an erratum must be done.
- void
- set_erratum_address(AArch64_address addr)
- { this->erratum_address_ = addr; }
- // Later relaxation passes of may alter the recorded erratum and destination
- // address. Given an up to date output section address of shidx_ in
- // relobj_ we can derive the erratum_address and destination address.
- void
- update_erratum_address(AArch64_address output_section_addr)
- {
- const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
- AArch64_address updated_addr = output_section_addr + this->sh_offset_;
- this->set_erratum_address(updated_addr);
- this->set_destination_address(updated_addr + BPI);
- }
- // Comparator used to group Erratum_stubs in a set by (obj, shndx,
- // sh_offset). We do not include 'type' in the calculation, because there is
- // at most one stub type at (obj, shndx, sh_offset).
- bool
- operator<(const Erratum_stub<size, big_endian>& k) const
- {
- if (this == &k)
- return false;
- // We group stubs by relobj.
- if (this->relobj_ != k.relobj_)
- return this->relobj_ < k.relobj_;
- // Then by section index.
- if (this->shndx_ != k.shndx_)
- return this->shndx_ < k.shndx_;
- // Lastly by section offset.
- return this->sh_offset_ < k.sh_offset_;
- }
- void
- invalidate_erratum_stub()
- {
- gold_assert(this->erratum_insn_ != invalid_insn);
- this->erratum_insn_ = invalid_insn;
- }
- bool
- is_invalidated_erratum_stub()
- { return this->erratum_insn_ == invalid_insn; }
- protected:
- virtual void
- do_write(unsigned char*, section_size_type);
- private:
- // The object that needs to be fixed.
- The_aarch64_relobj* relobj_;
- // The shndx in the object that needs to be fixed.
- const unsigned int shndx_;
- // The section offset in the obejct that needs to be fixed.
- const unsigned int sh_offset_;
- // The insn to be fixed.
- Insntype erratum_insn_;
- // The address of the above insn.
- AArch64_address erratum_address_;
- }; // End of "Erratum_stub".
- // Erratum sub class to wrap additional info needed by 843419. In fixing this
- // erratum, we may choose to replace 'adrp' with 'adr', in this case, we need
- // adrp's code position (two or three insns before erratum insn itself).
- template<int size, bool big_endian>
- class E843419_stub : public Erratum_stub<size, big_endian>
- {
- public:
- typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
- E843419_stub(AArch64_relobj<size, big_endian>* relobj,
- unsigned int shndx, unsigned int sh_offset,
- unsigned int adrp_sh_offset)
- : Erratum_stub<size, big_endian>(relobj, ST_E_843419, shndx, sh_offset),
- adrp_sh_offset_(adrp_sh_offset)
- {}
- unsigned int
- adrp_sh_offset() const
- { return this->adrp_sh_offset_; }
- private:
- // Section offset of "adrp". (We do not need a "adrp_shndx_" field, because we
- // can obtain it from its parent.)
- const unsigned int adrp_sh_offset_;
- };
- template<int size, bool big_endian>
- const int Erratum_stub<size, big_endian>::STUB_ADDR_ALIGN = 4;
- // Comparator used in set definition.
- template<int size, bool big_endian>
- struct Erratum_stub_less
- {
- bool
- operator()(const Erratum_stub<size, big_endian>* s1,
- const Erratum_stub<size, big_endian>* s2) const
- { return *s1 < *s2; }
- };
- // Erratum_stub implementation for writing stub to output file.
- template<int size, bool big_endian>
- void
- Erratum_stub<size, big_endian>::do_write(unsigned char* view, section_size_type)
- {
- typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
- const Insntype* insns = this->insns();
- uint32_t num_insns = this->insn_num();
- Insntype* ip = reinterpret_cast<Insntype*>(view);
- // For current implemented erratum 843419 and 835769, the first insn in the
- // stub is always a copy of the problematic insn (in 843419, the mem access
- // insn, in 835769, the mac insn), followed by a jump-back.
- elfcpp::Swap<32, big_endian>::writeval(ip, this->erratum_insn());
- for (uint32_t i = 1; i < num_insns; ++i)
- elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]);
- }
- // Reloc stub class.
- template<int size, bool big_endian>
- class Reloc_stub : public Stub_base<size, big_endian>
- {
- public:
- typedef Reloc_stub<size, big_endian> This;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
- // Branch range. This is used to calculate the section group size, as well as
- // determine whether a stub is needed.
- static const int MAX_BRANCH_OFFSET = ((1 << 25) - 1) << 2;
- static const int MIN_BRANCH_OFFSET = -((1 << 25) << 2);
- // Constant used to determine if an offset fits in the adrp instruction
- // encoding.
- static const int MAX_ADRP_IMM = (1 << 20) - 1;
- static const int MIN_ADRP_IMM = -(1 << 20);
- static const int BYTES_PER_INSN = 4;
- static const int STUB_ADDR_ALIGN;
- // Determine whether the offset fits in the jump/branch instruction.
- static bool
- aarch64_valid_branch_offset_p(int64_t offset)
- { return offset >= MIN_BRANCH_OFFSET && offset <= MAX_BRANCH_OFFSET; }
- // Determine whether the offset fits in the adrp immediate field.
- static bool
- aarch64_valid_for_adrp_p(AArch64_address location, AArch64_address dest)
- {
- typedef AArch64_relocate_functions<size, big_endian> Reloc;
- int64_t adrp_imm = (Reloc::Page(dest) - Reloc::Page(location)) >> 12;
- return adrp_imm >= MIN_ADRP_IMM && adrp_imm <= MAX_ADRP_IMM;
- }
- // Determine the stub type for a certain relocation or ST_NONE, if no stub is
- // needed.
- static int
- stub_type_for_reloc(unsigned int r_type, AArch64_address address,
- AArch64_address target);
- Reloc_stub(int type)
- : Stub_base<size, big_endian>(type)
- { }
- ~Reloc_stub()
- { }
- // The key class used to index the stub instance in the stub table's stub map.
- class Key
- {
- public:
- Key(int type, const Symbol* symbol, const Relobj* relobj,
- unsigned int r_sym, int32_t addend)
- : type_(type), addend_(addend)
- {
- if (symbol != NULL)
- {
- this->r_sym_ = Reloc_stub::invalid_index;
- this->u_.symbol = symbol;
- }
- else
- {
- gold_assert(relobj != NULL && r_sym != invalid_index);
- this->r_sym_ = r_sym;
- this->u_.relobj = relobj;
- }
- }
- ~Key()
- { }
- // Return stub type.
- int
- type() const
- { return this->type_; }
- // Return the local symbol index or invalid_index.
- unsigned int
- r_sym() const
- { return this->r_sym_; }
- // Return the symbol if there is one.
- const Symbol*
- symbol() const
- { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; }
- // Return the relobj if there is one.
- const Relobj*
- relobj() const
- { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; }
- // Whether this equals to another key k.
- bool
- eq(const Key& k) const
- {
- return ((this->type_ == k.type_)
- && (this->r_sym_ == k.r_sym_)
- && ((this->r_sym_ != Reloc_stub::invalid_index)
- ? (this->u_.relobj == k.u_.relobj)
- : (this->u_.symbol == k.u_.symbol))
- && (this->addend_ == k.addend_));
- }
- // Return a hash value.
- size_t
- hash_value() const
- {
- size_t name_hash_value = gold::string_hash<char>(
- (this->r_sym_ != Reloc_stub::invalid_index)
- ? this->u_.relobj->name().c_str()
- : this->u_.symbol->name());
- // We only have 4 stub types.
- size_t stub_type_hash_value = 0x03 & this->type_;
- return (name_hash_value
- ^ stub_type_hash_value
- ^ ((this->r_sym_ & 0x3fff) << 2)
- ^ ((this->addend_ & 0xffff) << 16));
- }
- // Functors for STL associative containers.
- struct hash
- {
- size_t
- operator()(const Key& k) const
- { return k.hash_value(); }
- };
- struct equal_to
- {
- bool
- operator()(const Key& k1, const Key& k2) const
- { return k1.eq(k2); }
- };
- private:
- // Stub type.
- const int type_;
- // If this is a local symbol, this is the index in the defining object.
- // Otherwise, it is invalid_index for a global symbol.
- unsigned int r_sym_;
- // If r_sym_ is an invalid index, this points to a global symbol.
- // Otherwise, it points to a relobj. We used the unsized and target
- // independent Symbol and Relobj classes instead of Sized_symbol<32> and
- // Arm_relobj, in order to avoid making the stub class a template
- // as most of the stub machinery is endianness-neutral. However, it
- // may require a bit of casting done by users of this class.
- union
- {
- const Symbol* symbol;
- const Relobj* relobj;
- } u_;
- // Addend associated with a reloc.
- int32_t addend_;
- }; // End of inner class Reloc_stub::Key
- protected:
- // This may be overridden in the child class.
- virtual void
- do_write(unsigned char*, section_size_type);
- private:
- static const unsigned int invalid_index = static_cast<unsigned int>(-1);
- }; // End of Reloc_stub
- template<int size, bool big_endian>
- const int Reloc_stub<size, big_endian>::STUB_ADDR_ALIGN = 4;
- // Write data to output file.
- template<int size, bool big_endian>
- void
- Reloc_stub<size, big_endian>::
- do_write(unsigned char* view, section_size_type)
- {
- typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
- const uint32_t* insns = this->insns();
- uint32_t num_insns = this->insn_num();
- Insntype* ip = reinterpret_cast<Insntype*>(view);
- for (uint32_t i = 0; i < num_insns; ++i)
- elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]);
- }
- // Determine the stub type for a certain relocation or ST_NONE, if no stub is
- // needed.
- template<int size, bool big_endian>
- inline int
- Reloc_stub<size, big_endian>::stub_type_for_reloc(
- unsigned int r_type, AArch64_address location, AArch64_address dest)
- {
- int64_t branch_offset = 0;
- switch(r_type)
- {
- case elfcpp::R_AARCH64_CALL26:
- case elfcpp::R_AARCH64_JUMP26:
- branch_offset = dest - location;
- break;
- default:
- gold_unreachable();
- }
- if (aarch64_valid_branch_offset_p(branch_offset))
- return ST_NONE;
- if (aarch64_valid_for_adrp_p(location, dest))
- return ST_ADRP_BRANCH;
- // Always use PC-relative addressing in case of -shared or -pie.
- if (parameters->options().output_is_position_independent())
- return ST_LONG_BRANCH_PCREL;
- // This saves 2 insns per stub, compared to ST_LONG_BRANCH_PCREL.
- // But is only applicable to non-shared or non-pie.
- return ST_LONG_BRANCH_ABS;
- }
- // A class to hold stubs for the ARM target. This contains 2 different types of
- // stubs - reloc stubs and erratum stubs.
- template<int size, bool big_endian>
- class Stub_table : public Output_data
- {
- public:
- typedef Target_aarch64<size, big_endian> The_target_aarch64;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
- typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
- typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
- typedef Reloc_stub<size, big_endian> The_reloc_stub;
- typedef typename The_reloc_stub::Key The_reloc_stub_key;
- typedef Erratum_stub<size, big_endian> The_erratum_stub;
- typedef Erratum_stub_less<size, big_endian> The_erratum_stub_less;
- typedef typename The_reloc_stub_key::hash The_reloc_stub_key_hash;
- typedef typename The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to;
- typedef Stub_table<size, big_endian> The_stub_table;
- typedef Unordered_map<The_reloc_stub_key, The_reloc_stub*,
- The_reloc_stub_key_hash, The_reloc_stub_key_equal_to>
- Reloc_stub_map;
- typedef typename Reloc_stub_map::const_iterator Reloc_stub_map_const_iter;
- typedef Relocate_info<size, big_endian> The_relocate_info;
- typedef std::set<The_erratum_stub*, The_erratum_stub_less> Erratum_stub_set;
- typedef typename Erratum_stub_set::iterator Erratum_stub_set_iter;
- Stub_table(The_aarch64_input_section* owner)
- : Output_data(), owner_(owner), reloc_stubs_size_(0),
- erratum_stubs_size_(0), prev_data_size_(0)
- { }
- ~Stub_table()
- { }
- The_aarch64_input_section*
- owner() const
- { return owner_; }
- // Whether this stub table is empty.
- bool
- empty() const
- { return reloc_stubs_.empty() && erratum_stubs_.empty(); }
- // Return the current data size.
- off_t
- current_data_size() const
- { return this->current_data_size_for_child(); }
- // Add a STUB using KEY. The caller is responsible for avoiding addition
- // if a STUB with the same key has already been added.
- void
- add_reloc_stub(The_reloc_stub* stub, const The_reloc_stub_key& key);
- // Add an erratum stub into the erratum stub set. The set is ordered by
- // (relobj, shndx, sh_offset).
- void
- add_erratum_stub(The_erratum_stub* stub);
- // Find if such erratum exists for any given (obj, shndx, sh_offset).
- The_erratum_stub*
- find_erratum_stub(The_aarch64_relobj* a64relobj,
- unsigned int shndx, unsigned int sh_offset);
- // Find all the erratums for a given input section. The return value is a pair
- // of iterators [begin, end).
- std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter>
- find_erratum_stubs_for_input_section(The_aarch64_relobj* a64relobj,
- unsigned int shndx);
- // Compute the erratum stub address.
- AArch64_address
- erratum_stub_address(The_erratum_stub* stub) const
- {
- AArch64_address r = align_address(this->address() + this->reloc_stubs_size_,
- The_erratum_stub::STUB_ADDR_ALIGN);
- r += stub->offset();
- return r;
- }
- // Finalize stubs. No-op here, just for completeness.
- void
- finalize_stubs()
- { }
- // Look up a relocation stub using KEY. Return NULL if there is none.
- The_reloc_stub*
- find_reloc_stub(The_reloc_stub_key& key)
- {
- Reloc_stub_map_const_iter p = this->reloc_stubs_.find(key);
- return (p != this->reloc_stubs_.end()) ? p->second : NULL;
- }
- // Relocate reloc stubs in this stub table. This does not relocate erratum stubs.
- void
- relocate_reloc_stubs(const The_relocate_info*,
- The_target_aarch64*,
- Output_section*,
- unsigned char*,
- AArch64_address,
- section_size_type);
- // Relocate an erratum stub.
- void
- relocate_erratum_stub(The_erratum_stub*, unsigned char*);
- // Update data size at the end of a relaxation pass. Return true if data size
- // is different from that of the previous relaxation pass.
- bool
- update_data_size_changed_p()
- {
- // No addralign changed here.
- off_t s = align_address(this->reloc_stubs_size_,
- The_erratum_stub::STUB_ADDR_ALIGN)
- + this->erratum_stubs_size_;
- bool changed = (s != this->prev_data_size_);
- this->prev_data_size_ = s;
- return changed;
- }
- protected:
- // Write out section contents.
- void
- do_write(Output_file*);
- // Return the required alignment.
- uint64_t
- do_addralign() const
- {
- return std::max(The_reloc_stub::STUB_ADDR_ALIGN,
- The_erratum_stub::STUB_ADDR_ALIGN);
- }
- // Reset address and file offset.
- void
- do_reset_address_and_file_offset()
- { this->set_current_data_size_for_child(this->prev_data_size_); }
- // Set final data size.
- void
- set_final_data_size()
- { this->set_data_size(this->current_data_size()); }
- private:
- // Relocate one reloc stub.
- void
- relocate_reloc_stub(The_reloc_stub*,
- const The_relocate_info*,
- The_target_aarch64*,
- Output_section*,
- unsigned char*,
- AArch64_address,
- section_size_type);
- private:
- // Owner of this stub table.
- The_aarch64_input_section* owner_;
- // The relocation stubs.
- Reloc_stub_map reloc_stubs_;
- // The erratum stubs.
- Erratum_stub_set erratum_stubs_;
- // Size of reloc stubs.
- off_t reloc_stubs_size_;
- // Size of erratum stubs.
- off_t erratum_stubs_size_;
- // data size of this in the previous pass.
- off_t prev_data_size_;
- }; // End of Stub_table
- // Add an erratum stub into the erratum stub set. The set is ordered by
- // (relobj, shndx, sh_offset).
- template<int size, bool big_endian>
- void
- Stub_table<size, big_endian>::add_erratum_stub(The_erratum_stub* stub)
- {
- std::pair<Erratum_stub_set_iter, bool> ret =
- this->erratum_stubs_.insert(stub);
- gold_assert(ret.second);
- this->erratum_stubs_size_ = align_address(
- this->erratum_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN);
- stub->set_offset(this->erratum_stubs_size_);
- this->erratum_stubs_size_ += stub->stub_size();
- }
- // Find if such erratum exists for given (obj, shndx, sh_offset).
- template<int size, bool big_endian>
- Erratum_stub<size, big_endian>*
- Stub_table<size, big_endian>::find_erratum_stub(
- The_aarch64_relobj* a64relobj, unsigned int shndx, unsigned int sh_offset)
- {
- // A dummy object used as key to search in the set.
- The_erratum_stub key(a64relobj, ST_NONE,
- shndx, sh_offset);
- Erratum_stub_set_iter i = this->erratum_stubs_.find(&key);
- if (i != this->erratum_stubs_.end())
- {
- The_erratum_stub* stub(*i);
- gold_assert(stub->erratum_insn() != 0);
- return stub;
- }
- return NULL;
- }
- // Find all the errata for a given input section. The return value is a pair of
- // iterators [begin, end).
- template<int size, bool big_endian>
- std::pair<typename Stub_table<size, big_endian>::Erratum_stub_set_iter,
- typename Stub_table<size, big_endian>::Erratum_stub_set_iter>
- Stub_table<size, big_endian>::find_erratum_stubs_for_input_section(
- The_aarch64_relobj* a64relobj, unsigned int shndx)
- {
- typedef std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter> Result_pair;
- Erratum_stub_set_iter start, end;
- The_erratum_stub low_key(a64relobj, ST_NONE, shndx, 0);
- start = this->erratum_stubs_.lower_bound(&low_key);
- if (start == this->erratum_stubs_.end())
- return Result_pair(this->erratum_stubs_.end(),
- this->erratum_stubs_.end());
- end = start;
- while (end != this->erratum_stubs_.end() &&
- (*end)->relobj() == a64relobj && (*end)->shndx() == shndx)
- ++end;
- return Result_pair(start, end);
- }
- // Add a STUB using KEY. The caller is responsible for avoiding addition
- // if a STUB with the same key has already been added.
- template<int size, bool big_endian>
- void
- Stub_table<size, big_endian>::add_reloc_stub(
- The_reloc_stub* stub, const The_reloc_stub_key& key)
- {
- gold_assert(stub->type() == key.type());
- this->reloc_stubs_[key] = stub;
- // Assign stub offset early. We can do this because we never remove
- // reloc stubs and they are in the beginning of the stub table.
- this->reloc_stubs_size_ = align_address(this->reloc_stubs_size_,
- The_reloc_stub::STUB_ADDR_ALIGN);
- stub->set_offset(this->reloc_stubs_size_);
- this->reloc_stubs_size_ += stub->stub_size();
- }
- // Relocate an erratum stub.
- template<int size, bool big_endian>
- void
- Stub_table<size, big_endian>::
- relocate_erratum_stub(The_erratum_stub* estub,
- unsigned char* view)
- {
- // Just for convenience.
- const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
- gold_assert(!estub->is_invalidated_erratum_stub());
- AArch64_address stub_address = this->erratum_stub_address(estub);
- // The address of "b" in the stub that is to be "relocated".
- AArch64_address stub_b_insn_address;
- // Branch offset that is to be filled in "b" insn.
- int b_offset = 0;
- switch (estub->type())
- {
- case ST_E_843419:
- case ST_E_835769:
- // The 1st insn of the erratum could be a relocation spot,
- // in this case we need to fix it with
- // "(*i)->erratum_insn()".
- elfcpp::Swap<32, big_endian>::writeval(
- view + (stub_address - this->address()),
- estub->erratum_insn());
- // For the erratum, the 2nd insn is a b-insn to be patched
- // (relocated).
- stub_b_insn_address = stub_address + 1 * BPI;
- b_offset = estub->destination_address() - stub_b_insn_address;
- AArch64_relocate_functions<size, big_endian>::construct_b(
- view + (stub_b_insn_address - this->address()),
- ((unsigned int)(b_offset)) & 0xfffffff);
- break;
- default:
- gold_unreachable();
- break;
- }
- estub->invalidate_erratum_stub();
- }
- // Relocate only reloc stubs in this stub table. This does not relocate erratum
- // stubs.
- template<int size, bool big_endian>
- void
- Stub_table<size, big_endian>::
- relocate_reloc_stubs(const The_relocate_info* relinfo,
- The_target_aarch64* target_aarch64,
- Output_section* output_section,
- unsigned char* view,
- AArch64_address address,
- section_size_type view_size)
- {
- // "view_size" is the total size of the stub_table.
- gold_assert(address == this->address() &&
- view_size == static_cast<section_size_type>(this->data_size()));
- for(Reloc_stub_map_const_iter p = this->reloc_stubs_.begin();
- p != this->reloc_stubs_.end(); ++p)
- relocate_reloc_stub(p->second, relinfo, target_aarch64, output_section,
- view, address, view_size);
- }
- // Relocate one reloc stub. This is a helper for
- // Stub_table::relocate_reloc_stubs().
- template<int size, bool big_endian>
- void
- Stub_table<size, big_endian>::
- relocate_reloc_stub(The_reloc_stub* stub,
- const The_relocate_info* relinfo,
- The_target_aarch64* target_aarch64,
- Output_section* output_section,
- unsigned char* view,
- AArch64_address address,
- section_size_type view_size)
- {
- // "offset" is the offset from the beginning of the stub_table.
- section_size_type offset = stub->offset();
- section_size_type stub_size = stub->stub_size();
- // "view_size" is the total size of the stub_table.
- gold_assert(offset + stub_size <= view_size);
- target_aarch64->relocate_reloc_stub(stub, relinfo, output_section,
- view + offset, address + offset, view_size);
- }
- // Write out the stubs to file.
- template<int size, bool big_endian>
- void
- Stub_table<size, big_endian>::do_write(Output_file* of)
- {
- off_t offset = this->offset();
- const section_size_type oview_size =
- convert_to_section_size_type(this->data_size());
- unsigned char* const oview = of->get_output_view(offset, oview_size);
- // Write relocation stubs.
- for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin();
- p != this->reloc_stubs_.end(); ++p)
- {
- The_reloc_stub* stub = p->second;
- AArch64_address address = this->address() + stub->offset();
- gold_assert(address ==
- align_address(address, The_reloc_stub::STUB_ADDR_ALIGN));
- stub->write(oview + stub->offset(), stub->stub_size());
- }
- // Write erratum stubs.
- unsigned int erratum_stub_start_offset =
- align_address(this->reloc_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN);
- for (typename Erratum_stub_set::iterator p = this->erratum_stubs_.begin();
- p != this->erratum_stubs_.end(); ++p)
- {
- The_erratum_stub* stub(*p);
- stub->write(oview + erratum_stub_start_offset + stub->offset(),
- stub->stub_size());
- }
- of->write_output_view(this->offset(), oview_size, oview);
- }
- // AArch64_relobj class.
- template<int size, bool big_endian>
- class AArch64_relobj : public Sized_relobj_file<size, big_endian>
- {
- public:
- typedef AArch64_relobj<size, big_endian> This;
- typedef Target_aarch64<size, big_endian> The_target_aarch64;
- typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
- typedef Stub_table<size, big_endian> The_stub_table;
- typedef Erratum_stub<size, big_endian> The_erratum_stub;
- typedef typename The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter;
- typedef std::vector<The_stub_table*> Stub_table_list;
- static const AArch64_address invalid_address =
- static_cast<AArch64_address>(-1);
- AArch64_relobj(const std::string& name, Input_file* input_file, off_t offset,
- const typename elfcpp::Ehdr<size, big_endian>& ehdr)
- : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr),
- stub_tables_()
- { }
- ~AArch64_relobj()
- { }
- // Return the stub table of the SHNDX-th section if there is one.
- The_stub_table*
- stub_table(unsigned int shndx) const
- {
- gold_assert(shndx < this->stub_tables_.size());
- return this->stub_tables_[shndx];
- }
- // Set STUB_TABLE to be the stub_table of the SHNDX-th section.
- void
- set_stub_table(unsigned int shndx, The_stub_table* stub_table)
- {
- gold_assert(shndx < this->stub_tables_.size());
- this->stub_tables_[shndx] = stub_table;
- }
- // Entrance to errata scanning.
- void
- scan_errata(unsigned int shndx,
- const elfcpp::Shdr<size, big_endian>&,
- Output_section*, const Symbol_table*,
- The_target_aarch64*);
- // Scan all relocation sections for stub generation.
- void
- scan_sections_for_stubs(The_target_aarch64*, const Symbol_table*,
- const Layout*);
- // Whether a section is a scannable text section.
- bool
- text_section_is_scannable(const elfcpp::Shdr<size, big_endian>&, unsigned int,
- const Output_section*, const Symbol_table*);
- // Convert regular input section with index SHNDX to a relaxed section.
- void
- convert_input_section_to_relaxed_section(unsigned shndx)
- {
- // The stubs have relocations and we need to process them after writing
- // out the stubs. So relocation now must follow section write.
- this->set_section_offset(shndx, -1ULL);
- this->set_relocs_must_follow_section_writes();
- }
- // Structure for mapping symbol position.
- struct Mapping_symbol_position
- {
- Mapping_symbol_position(unsigned int shndx, AArch64_address offset):
- shndx_(shndx), offset_(offset)
- {}
- // "<" comparator used in ordered_map container.
- bool
- operator<(const Mapping_symbol_position& p) const
- {
- return (this->shndx_ < p.shndx_
- || (this->shndx_ == p.shndx_ && this->offset_ < p.offset_));
- }
- // Section index.
- unsigned int shndx_;
- // Section offset.
- AArch64_address offset_;
- };
- typedef std::map<Mapping_symbol_position, char> Mapping_symbol_info;
- protected:
- // Post constructor setup.
- void
- do_setup()
- {
- // Call parent's setup method.
- Sized_relobj_file<size, big_endian>::do_setup();
- // Initialize look-up tables.
- this->stub_tables_.resize(this->shnum());
- }
- virtual void
- do_relocate_sections(
- const Symbol_table* symtab, const Layout* layout,
- const unsigned char* pshdrs, Output_file* of,
- typename Sized_relobj_file<size, big_endian>::Views* pviews);
- // Count local symbols and (optionally) record mapping info.
- virtual void
- do_count_local_symbols(Stringpool_template<char>*,
- Stringpool_template<char>*);
- private:
- // Fix all errata in the object, and for each erratum, relocate corresponding
- // erratum stub.
- void
- fix_errata_and_relocate_erratum_stubs(
- typename Sized_relobj_file<size, big_endian>::Views* pviews);
- // Try to fix erratum 843419 in an optimized way. Return true if patch is
- // applied.
- bool
- try_fix_erratum_843419_optimized(
- The_erratum_stub*, AArch64_address,
- typename Sized_relobj_file<size, big_endian>::View_size&);
- // Whether a section needs to be scanned for relocation stubs.
- bool
- section_needs_reloc_stub_scanning(const elfcpp::Shdr<size, big_endian>&,
- const Relobj::Output_sections&,
- const Symbol_table*, const unsigned char*);
- // List of stub tables.
- Stub_table_list stub_tables_;
- // Mapping symbol information sorted by (section index, section_offset).
- Mapping_symbol_info mapping_symbol_info_;
- }; // End of AArch64_relobj
- // Override to record mapping symbol information.
- template<int size, bool big_endian>
- void
- AArch64_relobj<size, big_endian>::do_count_local_symbols(
- Stringpool_template<char>* pool, Stringpool_template<char>* dynpool)
- {
- Sized_relobj_file<size, big_endian>::do_count_local_symbols(pool, dynpool);
- // Only erratum-fixing work needs mapping symbols, so skip this time consuming
- // processing if not fixing erratum.
- if (!parameters->options().fix_cortex_a53_843419()
- && !parameters->options().fix_cortex_a53_835769())
- return;
- const unsigned int loccount = this->local_symbol_count();
- if (loccount == 0)
- return;
- // Read the symbol table section header.
- const unsigned int symtab_shndx = this->symtab_shndx();
- elfcpp::Shdr<size, big_endian>
- symtabshdr(this, this->elf_file()->section_header(symtab_shndx));
- gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
- // Read the local symbols.
- const int sym_size =elfcpp::Elf_sizes<size>::sym_size;
- gold_assert(loccount == symtabshdr.get_sh_info());
- off_t locsize = loccount * sym_size;
- const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
- locsize, true, true);
- // For mapping symbol processing, we need to read the symbol names.
- unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link());
- if (strtab_shndx >= this->shnum())
- {
- this->error(_("invalid symbol table name index: %u"), strtab_shndx);
- return;
- }
- elfcpp::Shdr<size, big_endian>
- strtabshdr(this, this->elf_file()->section_header(strtab_shndx));
- if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB)
- {
- this->error(_("symbol table name section has wrong type: %u"),
- static_cast<unsigned int>(strtabshdr.get_sh_type()));
- return;
- }
- const char* pnames =
- reinterpret_cast<const char*>(this->get_view(strtabshdr.get_sh_offset(),
- strtabshdr.get_sh_size(),
- false, false));
- // Skip the first dummy symbol.
- psyms += sym_size;
- typename Sized_relobj_file<size, big_endian>::Local_values*
- plocal_values = this->local_values();
- for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
- {
- elfcpp::Sym<size, big_endian> sym(psyms);
- Symbol_value<size>& lv((*plocal_values)[i]);
- AArch64_address input_value = lv.input_value();
- // Check to see if this is a mapping symbol. AArch64 mapping symbols are
- // defined in "ELF for the ARM 64-bit Architecture", Table 4-4, Mapping
- // symbols.
- // Mapping symbols could be one of the following 4 forms -
- // a) $x
- // b) $x.<any...>
- // c) $d
- // d) $d.<any...>
- const char* sym_name = pnames + sym.get_st_name();
- if (sym_name[0] == '$' && (sym_name[1] == 'x' || sym_name[1] == 'd')
- && (sym_name[2] == '\0' || sym_name[2] == '.'))
- {
- bool is_ordinary;
- unsigned int input_shndx =
- this->adjust_sym_shndx(i, sym.get_st_shndx(), &is_ordinary);
- gold_assert(is_ordinary);
- Mapping_symbol_position msp(input_shndx, input_value);
- // Insert mapping_symbol_info into map whose ordering is defined by
- // (shndx, offset_within_section).
- this->mapping_symbol_info_[msp] = sym_name[1];
- }
- }
- }
- // Fix all errata in the object and for each erratum, we relocate the
- // corresponding erratum stub (by calling Stub_table::relocate_erratum_stub).
- template<int size, bool big_endian>
- void
- AArch64_relobj<size, big_endian>::fix_errata_and_relocate_erratum_stubs(
- typename Sized_relobj_file<size, big_endian>::Views* pviews)
- {
- typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
- unsigned int shnum = this->shnum();
- const Relobj::Output_sections& out_sections(this->output_sections());
- for (unsigned int i = 1; i < shnum; ++i)
- {
- The_stub_table* stub_table = this->stub_table(i);
- if (!stub_table)
- continue;
- std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter>
- ipair(stub_table->find_erratum_stubs_for_input_section(this, i));
- Erratum_stub_set_iter p = ipair.first, end = ipair.second;
- typename Sized_relobj_file<size, big_endian>::View_size&
- pview((*pviews)[i]);
- AArch64_address view_offset = 0;
- if (pview.is_input_output_view)
- {
- // In this case, write_sections has not added the output offset to
- // the view's address, so we must do so. Currently this only happens
- // for a relaxed section.
- unsigned int index = this->adjust_shndx(i);
- const Output_relaxed_input_section* poris =
- out_sections[index]->find_relaxed_input_section(this, index);
- gold_assert(poris != NULL);
- view_offset = poris->address() - pview.address;
- }
- while (p != end)
- {
- The_erratum_stub* stub = *p;
- // Double check data before fix.
- gold_assert(pview.address + view_offset + stub->sh_offset()
- == stub->erratum_address());
- // Update previously recorded erratum insn with relocated
- // version.
- Insntype* ip =
- reinterpret_cast<Insntype*>(
- pview.view + view_offset + stub->sh_offset());
- Insntype insn_to_fix = ip[0];
- stub->update_erratum_insn(insn_to_fix);
- // First try to see if erratum is 843419 and if it can be fixed
- // without using branch-to-stub.
- if (!try_fix_erratum_843419_optimized(stub, view_offset, pview))
- {
- // Replace the erratum insn with a branch-to-stub.
- AArch64_address stub_address =
- stub_table->erratum_stub_address(stub);
- unsigned int b_offset = stub_address - stub->erratum_address();
- AArch64_relocate_functions<size, big_endian>::construct_b(
- pview.view + view_offset + stub->sh_offset(),
- b_offset & 0xfffffff);
- }
- // Erratum fix is done (or skipped), continue to relocate erratum
- // stub. Note, when erratum fix is skipped (either because we
- // proactively change the code sequence or the code sequence is
- // changed by relaxation, etc), we can still safely relocate the
- // erratum stub, ignoring the fact the erratum could never be
- // executed.
- stub_table->relocate_erratum_stub(
- stub,
- pview.view + (stub_table->address() - pview.address));
- // Next erratum stub.
- ++p;
- }
- }
- }
- // This is an optimization for 843419. This erratum requires the sequence begin
- // with 'adrp', when final value calculated by adrp fits in adr, we can just
- // replace 'adrp' with 'adr', so we save 2 jumps per occurrence. (Note, however,
- // in this case, we do not delete the erratum stub (too late to do so), it is
- // merely generated without ever being called.)
- template<int size, bool big_endian>
- bool
- AArch64_relobj<size, big_endian>::try_fix_erratum_843419_optimized(
- The_erratum_stub* stub, AArch64_address view_offset,
- typename Sized_relobj_file<size, big_endian>::View_size& pview)
- {
- if (stub->type() != ST_E_843419)
- return false;
- typedef AArch64_insn_utilities<big_endian> Insn_utilities;
- typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
- E843419_stub<size, big_endian>* e843419_stub =
- reinterpret_cast<E843419_stub<size, big_endian>*>(stub);
- AArch64_address pc =
- pview.address + view_offset + e843419_stub->adrp_sh_offset();
- unsigned int adrp_offset = e843419_stub->adrp_sh_offset ();
- Insntype* adrp_view =
- reinterpret_cast<Insntype*>(pview.view + view_offset + adrp_offset);
- Insntype adrp_insn = adrp_view[0];
- // If the instruction at adrp_sh_offset is "mrs R, tpidr_el0", it may come
- // from IE -> LE relaxation etc. This is a side-effect of TLS relaxation that
- // ADRP has been turned into MRS, there is no erratum risk anymore.
- // Therefore, we return true to avoid doing unnecessary branch-to-stub.
- if (Insn_utilities::is_mrs_tpidr_el0(adrp_insn))
- return true;
- // If the instruction at adrp_sh_offset is not ADRP and the instruction before
- // it is "mrs R, tpidr_el0", it may come from LD -> LE relaxation etc.
- // Like the above case, there is no erratum risk any more, we can safely
- // return true.
- if (!Insn_utilities::is_adrp(adrp_insn) && adrp_offset)
- {
- Insntype* prev_view =
- reinterpret_cast<Insntype*>(
- pview.view + view_offset + adrp_offset - 4);
- Insntype prev_insn = prev_view[0];
- if (Insn_utilities::is_mrs_tpidr_el0(prev_insn))
- return true;
- }
- /* If we reach here, the first instruction must be ADRP. */
- gold_assert(Insn_utilities::is_adrp(adrp_insn));
- // Get adrp 33-bit signed imm value.
- int64_t adrp_imm = Insn_utilities::
- aarch64_adrp_decode_imm(adrp_insn);
- // adrp - final value transferred to target register is calculated as:
- // PC[11:0] = Zeros(12)
- // adrp_dest_value = PC + adrp_imm;
- int64_t adrp_dest_value = (pc & ~((1 << 12) - 1)) + adrp_imm;
- // adr -final value transferred to target register is calucalted as:
- // PC + adr_imm
- // So we have:
- // PC + adr_imm = adrp_dest_value
- // ==>
- // adr_imm = adrp_dest_value - PC
- int64_t adr_imm = adrp_dest_value - pc;
- // Check if imm fits in adr (21-bit signed).
- if (-(1 << 20) <= adr_imm && adr_imm < (1 << 20))
- {
- // Convert 'adrp' into 'adr'.
- Insntype adr_insn = adrp_insn & ((1u << 31) - 1);
- adr_insn = Insn_utilities::
- aarch64_adr_encode_imm(adr_insn, adr_imm);
- elfcpp::Swap<32, big_endian>::writeval(adrp_view, adr_insn);
- return true;
- }
- return false;
- }
- // Relocate sections.
- template<int size, bool big_endian>
- void
- AArch64_relobj<size, big_endian>::do_relocate_sections(
- const Symbol_table* symtab, const Layout* layout,
- const unsigned char* pshdrs, Output_file* of,
- typename Sized_relobj_file<size, big_endian>::Views* pviews)
- {
- // Relocate the section data.
- this->relocate_section_range(symtab, layout, pshdrs, of, pviews,
- 1, this->shnum() - 1);
- // We do not generate stubs if doing a relocatable link.
- if (parameters->options().relocatable())
- return;
- // This part only relocates erratum stubs that belong to input sections of this
- // object file.
- if (parameters->options().fix_cortex_a53_843419()
- || parameters->options().fix_cortex_a53_835769())
- this->fix_errata_and_relocate_erratum_stubs(pviews);
- Relocate_info<size, big_endian> relinfo;
- relinfo.symtab = symtab;
- relinfo.layout = layout;
- relinfo.object = this;
- // This part relocates all reloc stubs that are contained in stub_tables of
- // this object file.
- unsigned int shnum = this->shnum();
- The_target_aarch64* target = The_target_aarch64::current_target();
- for (unsigned int i = 1; i < shnum; ++i)
- {
- The_aarch64_input_section* aarch64_input_section =
- target->find_aarch64_input_section(this, i);
- if (aarch64_input_section != NULL
- && aarch64_input_section->is_stub_table_owner()
- && !aarch64_input_section->stub_table()->empty())
- {
- Output_section* os = this->output_section(i);
- gold_assert(os != NULL);
- relinfo.reloc_shndx = elfcpp::SHN_UNDEF;
- relinfo.reloc_shdr = NULL;
- relinfo.data_shndx = i;
- relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<size>::shdr_size;
- typename Sized_relobj_file<size, big_endian>::View_size&
- view_struct = (*pviews)[i];
- gold_assert(view_struct.view != NULL);
- The_stub_table* stub_table = aarch64_input_section->stub_table();
- off_t offset = stub_table->address() - view_struct.address;
- unsigned char* view = view_struct.view + offset;
- AArch64_address address = stub_table->address();
- section_size_type view_size = stub_table->data_size();
- stub_table->relocate_reloc_stubs(&relinfo, target, os, view, address,
- view_size);
- }
- }
- }
- // Determine if an input section is scannable for stub processing. SHDR is
- // the header of the section and SHNDX is the section index. OS is the output
- // section for the input section and SYMTAB is the global symbol table used to
- // look up ICF information.
- template<int size, bool big_endian>
- bool
- AArch64_relobj<size, big_endian>::text_section_is_scannable(
- const elfcpp::Shdr<size, big_endian>& text_shdr,
- unsigned int text_shndx,
- const Output_section* os,
- const Symbol_table* symtab)
- {
- // Skip any empty sections, unallocated sections or sections whose
- // type are not SHT_PROGBITS.
- if (text_shdr.get_sh_size() == 0
- || (text_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0
- || text_shdr.get_sh_type() != elfcpp::SHT_PROGBITS)
- return false;
- // Skip any discarded or ICF'ed sections.
- if (os == NULL || symtab->is_section_folded(this, text_shndx))
- return false;
- // Skip exception frame.
- if (strcmp(os->name(), ".eh_frame") == 0)
- return false ;
- gold_assert(!this->is_output_section_offset_invalid(text_shndx) ||
- os->find_relaxed_input_section(this, text_shndx) != NULL);
- return true;
- }
- // Determine if we want to scan the SHNDX-th section for relocation stubs.
- // This is a helper for AArch64_relobj::scan_sections_for_stubs().
- template<int size, bool big_endian>
- bool
- AArch64_relobj<size, big_endian>::section_needs_reloc_stub_scanning(
- const elfcpp::Shdr<size, big_endian>& shdr,
- const Relobj::Output_sections& out_sections,
- const Symbol_table* symtab,
- const unsigned char* pshdrs)
- {
- unsigned int sh_type = shdr.get_sh_type();
- if (sh_type != elfcpp::SHT_RELA)
- return false;
- // Ignore empty section.
- off_t sh_size = shdr.get_sh_size();
- if (sh_size == 0)
- return false;
- // Ignore reloc section with unexpected symbol table. The
- // error will be reported in the final link.
- if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx())
- return false;
- gold_assert(sh_type == elfcpp::SHT_RELA);
- unsigned int reloc_size = elfcpp::Elf_sizes<size>::rela_size;
- // Ignore reloc section with unexpected entsize or uneven size.
- // The error will be reported in the final link.
- if (reloc_size != shdr.get_sh_entsize() || sh_size % reloc_size != 0)
- return false;
- // Ignore reloc section with bad info. This error will be
- // reported in the final link.
- unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_info());
- if (text_shndx >= this->shnum())
- return false;
- const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
- const elfcpp::Shdr<size, big_endian> text_shdr(pshdrs +
- text_shndx * shdr_size);
- return this->text_section_is_scannable(text_shdr, text_shndx,
- out_sections[text_shndx], symtab);
- }
- // Scan section SHNDX for erratum 843419 and 835769.
- template<int size, bool big_endian>
- void
- AArch64_relobj<size, big_endian>::scan_errata(
- unsigned int shndx, const elfcpp::Shdr<size, big_endian>& shdr,
- Output_section* os, const Symbol_table* symtab,
- The_target_aarch64* target)
- {
- if (shdr.get_sh_size() == 0
- || (shdr.get_sh_flags() &
- (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) == 0
- || shdr.get_sh_type() != elfcpp::SHT_PROGBITS)
- return;
- if (!os || symtab->is_section_folded(this, shndx)) return;
- AArch64_address output_offset = this->get_output_section_offset(shndx);
- AArch64_address output_address;
- if (output_offset != invalid_address)
- output_address = os->address() + output_offset;
- else
- {
- const Output_relaxed_input_section* poris =
- os->find_relaxed_input_section(this, shndx);
- if (!poris) return;
- output_address = poris->address();
- }
- // Update the addresses in previously generated erratum stubs. Unlike when
- // we scan relocations for stubs, if section addresses have changed due to
- // other relaxations we are unlikely to scan the same erratum instances
- // again.
- The_stub_table* stub_table = this->stub_table(shndx);
- if (stub_table)
- {
- std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter>
- ipair(stub_table->find_erratum_stubs_for_input_section(this, shndx));
- for (Erratum_stub_set_iter p = ipair.first; p != ipair.second; ++p)
- (*p)->update_erratum_address(output_address);
- }
- section_size_type input_view_size = 0;
- const unsigned char* input_view =
- this->section_contents(shndx, &input_view_size, false);
- Mapping_symbol_position section_start(shndx, 0);
- // Find the first mapping symbol record within section shndx.
- typename Mapping_symbol_info::const_iterator p =
- this->mapping_symbol_info_.lower_bound(section_start);
- while (p != this->mapping_symbol_info_.end() &&
- p->first.shndx_ == shndx)
- {
- typename Mapping_symbol_info::const_iterator prev = p;
- ++p;
- if (prev->second == 'x')
- {
- section_size_type span_start =
- convert_to_section_size_type(prev->first.offset_);
- section_size_type span_end;
- if (p != this->mapping_symbol_info_.end()
- && p->first.shndx_ == shndx)
- span_end = convert_to_section_size_type(p->first.offset_);
- else
- span_end = convert_to_section_size_type(shdr.get_sh_size());
- // Here we do not share the scanning code of both errata. For 843419,
- // only the last few insns of each page are examined, which is fast,
- // whereas, for 835769, every insn pair needs to be checked.
- if (parameters->options().fix_cortex_a53_843419())
- target->scan_erratum_843419_span(
- this, shndx, span_start, span_end,
- const_cast<unsigned char*>(input_view), output_address);
- if (parameters->options().fix_cortex_a53_835769())
- target->scan_erratum_835769_span(
- this, shndx, span_start, span_end,
- const_cast<unsigned char*>(input_view), output_address);
- }
- }
- }
- // Scan relocations for stub generation.
- template<int size, bool big_endian>
- void
- AArch64_relobj<size, big_endian>::scan_sections_for_stubs(
- The_target_aarch64* target,
- const Symbol_table* symtab,
- const Layout* layout)
- {
- unsigned int shnum = this->shnum();
- const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
- // Read the section headers.
- const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(),
- shnum * shdr_size,
- true, true);
- // To speed up processing, we set up hash tables for fast lookup of
- // input offsets to output addresses.
- this->initialize_input_to_output_maps();
- const Relobj::Output_sections& out_sections(this->output_sections());
- Relocate_info<size, big_endian> relinfo;
- relinfo.symtab = symtab;
- relinfo.layout = layout;
- relinfo.object = this;
- // Do relocation stubs scanning.
- const unsigned char* p = pshdrs + shdr_size;
- for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
- {
- const elfcpp::Shdr<size, big_endian> shdr(p);
- if (parameters->options().fix_cortex_a53_843419()
- || parameters->options().fix_cortex_a53_835769())
- scan_errata(i, shdr, out_sections[i], symtab, target);
- if (this->section_needs_reloc_stub_scanning(shdr, out_sections, symtab,
- pshdrs))
- {
- unsigned int index = this->adjust_shndx(shdr.get_sh_info());
- AArch64_address output_offset =
- this->get_output_section_offset(index);
- AArch64_address output_address;
- if (output_offset != invalid_address)
- {
- output_address = out_sections[index]->address() + output_offset;
- }
- else
- {
- // Currently this only happens for a relaxed section.
- const Output_relaxed_input_section* poris =
- out_sections[index]->find_relaxed_input_section(this, index);
- gold_assert(poris != NULL);
- output_address = poris->address();
- }
- // Get the relocations.
- const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
- shdr.get_sh_size(),
- true, false);
- // Get the section contents.
- section_size_type input_view_size = 0;
- const unsigned char* input_view =
- this->section_contents(index, &input_view_size, false);
- relinfo.reloc_shndx = i;
- relinfo.data_shndx = index;
- unsigned int sh_type = shdr.get_sh_type();
- unsigned int reloc_size;
- gold_assert (sh_type == elfcpp::SHT_RELA);
- reloc_size = elfcpp::Elf_sizes<size>::rela_size;
- Output_section* os = out_sections[index];
- target->scan_section_for_stubs(&relinfo, sh_type, prelocs,
- shdr.get_sh_size() / reloc_size,
- os,
- output_offset == invalid_address,
- input_view, output_address,
- input_view_size);
- }
- }
- }
- // A class to wrap an ordinary input section containing executable code.
- template<int size, bool big_endian>
- class AArch64_input_section : public Output_relaxed_input_section
- {
- public:
- typedef Stub_table<size, big_endian> The_stub_table;
- AArch64_input_section(Relobj* relobj, unsigned int shndx)
- : Output_relaxed_input_section(relobj, shndx, 1),
- stub_table_(NULL),
- original_contents_(NULL), original_size_(0),
- original_addralign_(1)
- { }
- ~AArch64_input_section()
- { delete[] this->original_contents_; }
- // Initialize.
- void
- init();
- // Set the stub_table.
- void
- set_stub_table(The_stub_table* st)
- { this->stub_table_ = st; }
- // Whether this is a stub table owner.
- bool
- is_stub_table_owner() const
- { return this->stub_table_ != NULL && this->stub_table_->owner() == this; }
- // Return the original size of the section.
- uint32_t
- original_size() const
- { return this->original_size_; }
- // Return the stub table.
- The_stub_table*
- stub_table()
- { return stub_table_; }
- protected:
- // Write out this input section.
- void
- do_write(Output_file*);
- // Return required alignment of this.
- uint64_t
- do_addralign() const
- {
- if (this->is_stub_table_owner())
- return std::max(this->stub_table_->addralign(),
- static_cast<uint64_t>(this->original_addralign_));
- else
- return this->original_addralign_;
- }
- // Finalize data size.
- void
- set_final_data_size();
- // Reset address and file offset.
- void
- do_reset_address_and_file_offset();
- // Output offset.
- bool
- do_output_offset(const Relobj* object, unsigned int shndx,
- section_offset_type offset,
- section_offset_type* poutput) const
- {
- if ((object == this->relobj())
- && (shndx == this->shndx())
- && (offset >= 0)
- && (offset <=
- convert_types<section_offset_type, uint32_t>(this->original_size_)))
- {
- *poutput = offset;
- return true;
- }
- else
- return false;
- }
- private:
- // Copying is not allowed.
- AArch64_input_section(const AArch64_input_section&);
- AArch64_input_section& operator=(const AArch64_input_section&);
- // The relocation stubs.
- The_stub_table* stub_table_;
- // Original section contents. We have to make a copy here since the file
- // containing the original section may not be locked when we need to access
- // the contents.
- unsigned char* original_contents_;
- // Section size of the original input section.
- uint32_t original_size_;
- // Address alignment of the original input section.
- uint32_t original_addralign_;
- }; // End of AArch64_input_section
- // Finalize data size.
- template<int size, bool big_endian>
- void
- AArch64_input_section<size, big_endian>::set_final_data_size()
- {
- off_t off = convert_types<off_t, uint64_t>(this->original_size_);
- if (this->is_stub_table_owner())
- {
- this->stub_table_->finalize_data_size();
- off = align_address(off, this->stub_table_->addralign());
- off += this->stub_table_->data_size();
- }
- this->set_data_size(off);
- }
- // Reset address and file offset.
- template<int size, bool big_endian>
- void
- AArch64_input_section<size, big_endian>::do_reset_address_and_file_offset()
- {
- // Size of the original input section contents.
- off_t off = convert_types<off_t, uint64_t>(this->original_size_);
- // If this is a stub table owner, account for the stub table size.
- if (this->is_stub_table_owner())
- {
- The_stub_table* stub_table = this->stub_table_;
- // Reset the stub table's address and file offset. The
- // current data size for child will be updated after that.
- stub_table_->reset_address_and_file_offset();
- off = align_address(off, stub_table_->addralign());
- off += stub_table->current_data_size();
- }
- this->set_current_data_size(off);
- }
- // Initialize an Arm_input_section.
- template<int size, bool big_endian>
- void
- AArch64_input_section<size, big_endian>::init()
- {
- Relobj* relobj = this->relobj();
- unsigned int shndx = this->shndx();
- // We have to cache original size, alignment and contents to avoid locking
- // the original file.
- this->original_addralign_ =
- convert_types<uint32_t, uint64_t>(relobj->section_addralign(shndx));
- // This is not efficient but we expect only a small number of relaxed
- // input sections for stubs.
- section_size_type section_size;
- const unsigned char* section_contents =
- relobj->section_contents(shndx, §ion_size, false);
- this->original_size_ =
- convert_types<uint32_t, uint64_t>(relobj->section_size(shndx));
- gold_assert(this->original_contents_ == NULL);
- this->original_contents_ = new unsigned char[section_size];
- memcpy(this->original_contents_, section_contents, section_size);
- // We want to make this look like the original input section after
- // output sections are finalized.
- Output_section* os = relobj->output_section(shndx);
- off_t offset = relobj->output_section_offset(shndx);
- gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx));
- this->set_address(os->address() + offset);
- this->set_file_offset(os->offset() + offset);
- this->set_current_data_size(this->original_size_);
- this->finalize_data_size();
- }
- // Write data to output file.
- template<int size, bool big_endian>
- void
- AArch64_input_section<size, big_endian>::do_write(Output_file* of)
- {
- // We have to write out the original section content.
- gold_assert(this->original_contents_ != NULL);
- of->write(this->offset(), this->original_contents_,
- this->original_size_);
- // If this owns a stub table and it is not empty, write it.
- if (this->is_stub_table_owner() && !this->stub_table_->empty())
- this->stub_table_->write(of);
- }
- // Arm output section class. This is defined mainly to add a number of stub
- // generation methods.
- template<int size, bool big_endian>
- class AArch64_output_section : public Output_section
- {
- public:
- typedef Target_aarch64<size, big_endian> The_target_aarch64;
- typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
- typedef Stub_table<size, big_endian> The_stub_table;
- typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
- public:
- AArch64_output_section(const char* name, elfcpp::Elf_Word type,
- elfcpp::Elf_Xword flags)
- : Output_section(name, type, flags)
- { }
- ~AArch64_output_section() {}
- // Group input sections for stub generation.
- void
- group_sections(section_size_type, bool, Target_aarch64<size, big_endian>*,
- const Task*);
- private:
- typedef Output_section::Input_section Input_section;
- typedef Output_section::Input_section_list Input_section_list;
- // Create a stub group.
- void
- create_stub_group(Input_section_list::const_iterator,
- Input_section_list::const_iterator,
- Input_section_list::const_iterator,
- The_target_aarch64*,
- std::vector<Output_relaxed_input_section*>&,
- const Task*);
- }; // End of AArch64_output_section
- // Create a stub group for input sections from FIRST to LAST. OWNER points to
- // the input section that will be the owner of the stub table.
- template<int size, bool big_endian> void
- AArch64_output_section<size, big_endian>::create_stub_group(
- Input_section_list::const_iterator first,
- Input_section_list::const_iterator last,
- Input_section_list::const_iterator owner,
- The_target_aarch64* target,
- std::vector<Output_relaxed_input_section*>& new_relaxed_sections,
- const Task* task)
- {
- // Currently we convert ordinary input sections into relaxed sections only
- // at this point.
- The_aarch64_input_section* input_section;
- if (owner->is_relaxed_input_section())
- gold_unreachable();
- else
- {
- gold_assert(owner->is_input_section());
- // Create a new relaxed input section. We need to lock the original
- // file.
- Task_lock_obj<Object> tl(task, owner->relobj());
- input_section =
- target->new_aarch64_input_section(owner->relobj(), owner->shndx());
- new_relaxed_sections.push_back(input_section);
- }
- // Create a stub table.
- The_stub_table* stub_table =
- target->new_stub_table(input_section);
- input_section->set_stub_table(stub_table);
- Input_section_list::const_iterator p = first;
- // Look for input sections or relaxed input sections in [first ... last].
- do
- {
- if (p->is_input_section() || p->is_relaxed_input_section())
- {
- // The stub table information for input sections live
- // in their objects.
- The_aarch64_relobj* aarch64_relobj =
- static_cast<The_aarch64_relobj*>(p->relobj());
- aarch64_relobj->set_stub_table(p->shndx(), stub_table);
- }
- }
- while (p++ != last);
- }
- // Group input sections for stub generation. GROUP_SIZE is roughly the limit of
- // stub groups. We grow a stub group by adding input section until the size is
- // just below GROUP_SIZE. The last input section will be converted into a stub
- // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond
- // after the stub table, effectively doubling the group size.
- //
- // This is similar to the group_sections() function in elf32-arm.c but is
- // implemented differently.
- template<int size, bool big_endian>
- void AArch64_output_section<size, big_endian>::group_sections(
- section_size_type group_size,
- bool stubs_always_after_branch,
- Target_aarch64<size, big_endian>* target,
- const Task* task)
- {
- typedef enum
- {
- NO_GROUP,
- FINDING_STUB_SECTION,
- HAS_STUB_SECTION
- } State;
- std::vector<Output_relaxed_input_section*> new_relaxed_sections;
- State state = NO_GROUP;
- section_size_type off = 0;
- section_size_type group_begin_offset = 0;
- section_size_type group_end_offset = 0;
- section_size_type stub_table_end_offset = 0;
- Input_section_list::const_iterator group_begin =
- this->input_sections().end();
- Input_section_list::const_iterator stub_table =
- this->input_sections().end();
- Input_section_list::const_iterator group_end = this->input_sections().end();
- for (Input_section_list::const_iterator p = this->input_sections().begin();
- p != this->input_sections().end();
- ++p)
- {
- section_size_type section_begin_offset =
- align_address(off, p->addralign());
- section_size_type section_end_offset =
- section_begin_offset + p->data_size();
- // Check to see if we should group the previously seen sections.
- switch (state)
- {
- case NO_GROUP:
- break;
- case FINDING_STUB_SECTION:
- // Adding this section makes the group larger than GROUP_SIZE.
- if (section_end_offset - group_begin_offset >= group_size)
- {
- if (stubs_always_after_branch)
- {
- gold_assert(group_end != this->input_sections().end());
- this->create_stub_group(group_begin, group_end, group_end,
- target, new_relaxed_sections,
- task);
- state = NO_GROUP;
- }
- else
- {
- // Input sections up to stub_group_size bytes after the stub
- // table can be handled by it too.
- state = HAS_STUB_SECTION;
- stub_table = group_end;
- stub_table_end_offset = group_end_offset;
- }
- }
- break;
- case HAS_STUB_SECTION:
- // Adding this section makes the post stub-section group larger
- // than GROUP_SIZE.
- gold_unreachable();
- // NOT SUPPORTED YET. For completeness only.
- if (section_end_offset - stub_table_end_offset >= group_size)
- {
- gold_assert(group_end != this->input_sections().end());
- this->create_stub_group(group_begin, group_end, stub_table,
- target, new_relaxed_sections, task);
- state = NO_GROUP;
- }
- break;
- default:
- gold_unreachable();
- }
- // If we see an input section and currently there is no group, start
- // a new one. Skip any empty sections. We look at the data size
- // instead of calling p->relobj()->section_size() to avoid locking.
- if ((p->is_input_section() || p->is_relaxed_input_section())
- && (p->data_size() != 0))
- {
- if (state == NO_GROUP)
- {
- state = FINDING_STUB_SECTION;
- group_begin = p;
- group_begin_offset = section_begin_offset;
- }
- // Keep track of the last input section seen.
- group_end = p;
- group_end_offset = section_end_offset;
- }
- off = section_end_offset;
- }
- // Create a stub group for any ungrouped sections.
- if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION)
- {
- gold_assert(group_end != this->input_sections().end());
- this->create_stub_group(group_begin, group_end,
- (state == FINDING_STUB_SECTION
- ? group_end
- : stub_table),
- target, new_relaxed_sections, task);
- }
- if (!new_relaxed_sections.empty())
- this->convert_input_sections_to_relaxed_sections(new_relaxed_sections);
- // Update the section offsets
- for (size_t i = 0; i < new_relaxed_sections.size(); ++i)
- {
- The_aarch64_relobj* relobj = static_cast<The_aarch64_relobj*>(
- new_relaxed_sections[i]->relobj());
- unsigned int shndx = new_relaxed_sections[i]->shndx();
- // Tell AArch64_relobj that this input section is converted.
- relobj->convert_input_section_to_relaxed_section(shndx);
- }
- } // End of AArch64_output_section::group_sections
- AArch64_reloc_property_table* aarch64_reloc_property_table = NULL;
- // The aarch64 target class.
- // See the ABI at
- // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
- template<int size, bool big_endian>
- class Target_aarch64 : public Sized_target<size, big_endian>
- {
- public:
- typedef Target_aarch64<size, big_endian> This;
- typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
- Reloc_section;
- typedef Relocate_info<size, big_endian> The_relocate_info;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
- typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
- typedef Reloc_stub<size, big_endian> The_reloc_stub;
- typedef Erratum_stub<size, big_endian> The_erratum_stub;
- typedef typename Reloc_stub<size, big_endian>::Key The_reloc_stub_key;
- typedef Stub_table<size, big_endian> The_stub_table;
- typedef std::vector<The_stub_table*> Stub_table_list;
- typedef typename Stub_table_list::iterator Stub_table_iterator;
- typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
- typedef AArch64_output_section<size, big_endian> The_aarch64_output_section;
- typedef Unordered_map<Section_id,
- AArch64_input_section<size, big_endian>*,
- Section_id_hash> AArch64_input_section_map;
- typedef AArch64_insn_utilities<big_endian> Insn_utilities;
- const static int TCB_SIZE = size / 8 * 2;
- Target_aarch64(const Target::Target_info* info = &aarch64_info)
- : Sized_target<size, big_endian>(info),
- got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
- got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
- rela_irelative_(NULL), copy_relocs_(elfcpp::R_AARCH64_COPY),
- got_mod_index_offset_(-1U),
- tlsdesc_reloc_info_(), tls_base_symbol_defined_(false),
- stub_tables_(), stub_group_size_(0), aarch64_input_section_map_()
- { }
- // Scan the relocations to determine unreferenced sections for
- // garbage collection.
- void
- gc_process_relocs(Symbol_table* symtab,
- Layout* layout,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int data_shndx,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- size_t local_symbol_count,
- const unsigned char* plocal_symbols);
- // Scan the relocations to look for symbol adjustments.
- void
- scan_relocs(Symbol_table* symtab,
- Layout* layout,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int data_shndx,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- size_t local_symbol_count,
- const unsigned char* plocal_symbols);
- // Finalize the sections.
- void
- do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
- // Return the value to use for a dynamic which requires special
- // treatment.
- uint64_t
- do_dynsym_value(const Symbol*) const;
- // Relocate a section.
- void
- relocate_section(const Relocate_info<size, big_endian>*,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- unsigned char* view,
- typename elfcpp::Elf_types<size>::Elf_Addr view_address,
- section_size_type view_size,
- const Reloc_symbol_changes*);
- // Scan the relocs during a relocatable link.
- void
- scan_relocatable_relocs(Symbol_table* symtab,
- Layout* layout,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int data_shndx,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- size_t local_symbol_count,
- const unsigned char* plocal_symbols,
- Relocatable_relocs*);
- // Scan the relocs for --emit-relocs.
- void
- emit_relocs_scan(Symbol_table* symtab,
- Layout* layout,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int data_shndx,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- size_t local_symbol_count,
- const unsigned char* plocal_syms,
- Relocatable_relocs* rr);
- // Relocate a section during a relocatable link.
- void
- relocate_relocs(
- const Relocate_info<size, big_endian>*,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
- unsigned char* view,
- typename elfcpp::Elf_types<size>::Elf_Addr view_address,
- section_size_type view_size,
- unsigned char* reloc_view,
- section_size_type reloc_view_size);
- // Return the symbol index to use for a target specific relocation.
- // The only target specific relocation is R_AARCH64_TLSDESC for a
- // local symbol, which is an absolute reloc.
- unsigned int
- do_reloc_symbol_index(void*, unsigned int r_type) const
- {
- gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC);
- return 0;
- }
- // Return the addend to use for a target specific relocation.
- uint64_t
- do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
- // Return the PLT section.
- uint64_t
- do_plt_address_for_global(const Symbol* gsym) const
- { return this->plt_section()->address_for_global(gsym); }
- uint64_t
- do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
- { return this->plt_section()->address_for_local(relobj, symndx); }
- // This function should be defined in targets that can use relocation
- // types to determine (implemented in local_reloc_may_be_function_pointer
- // and global_reloc_may_be_function_pointer)
- // if a function's pointer is taken. ICF uses this in safe mode to only
- // fold those functions whose pointer is defintely not taken.
- bool
- do_can_check_for_function_pointers() const
- { return true; }
- // Return the number of entries in the PLT.
- unsigned int
- plt_entry_count() const;
- //Return the offset of the first non-reserved PLT entry.
- unsigned int
- first_plt_entry_offset() const;
- // Return the size of each PLT entry.
- unsigned int
- plt_entry_size() const;
- // Create a stub table.
- The_stub_table*
- new_stub_table(The_aarch64_input_section*);
- // Create an aarch64 input section.
- The_aarch64_input_section*
- new_aarch64_input_section(Relobj*, unsigned int);
- // Find an aarch64 input section instance for a given OBJ and SHNDX.
- The_aarch64_input_section*
- find_aarch64_input_section(Relobj*, unsigned int) const;
- // Return the thread control block size.
- unsigned int
- tcb_size() const { return This::TCB_SIZE; }
- // Scan a section for stub generation.
- void
- scan_section_for_stubs(const Relocate_info<size, big_endian>*, unsigned int,
- const unsigned char*, size_t, Output_section*,
- bool, const unsigned char*,
- Address,
- section_size_type);
- // Scan a relocation section for stub.
- template<int sh_type>
- void
- scan_reloc_section_for_stubs(
- const The_relocate_info* relinfo,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- const unsigned char* view,
- Address view_address,
- section_size_type);
- // Relocate a single reloc stub.
- void
- relocate_reloc_stub(The_reloc_stub*, const Relocate_info<size, big_endian>*,
- Output_section*, unsigned char*, Address,
- section_size_type);
- // Get the default AArch64 target.
- static This*
- current_target()
- {
- gold_assert(parameters->target().machine_code() == elfcpp::EM_AARCH64
- && parameters->target().get_size() == size
- && parameters->target().is_big_endian() == big_endian);
- return static_cast<This*>(parameters->sized_target<size, big_endian>());
- }
- // Scan erratum 843419 for a part of a section.
- void
- scan_erratum_843419_span(
- AArch64_relobj<size, big_endian>*,
- unsigned int,
- const section_size_type,
- const section_size_type,
- unsigned char*,
- Address);
- // Scan erratum 835769 for a part of a section.
- void
- scan_erratum_835769_span(
- AArch64_relobj<size, big_endian>*,
- unsigned int,
- const section_size_type,
- const section_size_type,
- unsigned char*,
- Address);
- protected:
- void
- do_select_as_default_target()
- {
- gold_assert(aarch64_reloc_property_table == NULL);
- aarch64_reloc_property_table = new AArch64_reloc_property_table();
- }
- // Add a new reloc argument, returning the index in the vector.
- size_t
- add_tlsdesc_info(Sized_relobj_file<size, big_endian>* object,
- unsigned int r_sym)
- {
- this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym));
- return this->tlsdesc_reloc_info_.size() - 1;
- }
- virtual Output_data_plt_aarch64<size, big_endian>*
- do_make_data_plt(Layout* layout,
- Output_data_got_aarch64<size, big_endian>* got,
- Output_data_space* got_plt,
- Output_data_space* got_irelative)
- {
- return new Output_data_plt_aarch64_standard<size, big_endian>(
- layout, got, got_plt, got_irelative);
- }
- // do_make_elf_object to override the same function in the base class.
- Object*
- do_make_elf_object(const std::string&, Input_file*, off_t,
- const elfcpp::Ehdr<size, big_endian>&);
- Output_data_plt_aarch64<size, big_endian>*
- make_data_plt(Layout* layout,
- Output_data_got_aarch64<size, big_endian>* got,
- Output_data_space* got_plt,
- Output_data_space* got_irelative)
- {
- return this->do_make_data_plt(layout, got, got_plt, got_irelative);
- }
- // We only need to generate stubs, and hence perform relaxation if we are
- // not doing relocatable linking.
- virtual bool
- do_may_relax() const
- { return !parameters->options().relocatable(); }
- // Relaxation hook. This is where we do stub generation.
- virtual bool
- do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*);
- void
- group_sections(Layout* layout,
- section_size_type group_size,
- bool stubs_always_after_branch,
- const Task* task);
- void
- scan_reloc_for_stub(const The_relocate_info*, unsigned int,
- const Sized_symbol<size>*, unsigned int,
- const Symbol_value<size>*,
- typename elfcpp::Elf_types<size>::Elf_Swxword,
- Address Elf_Addr);
- // Make an output section.
- Output_section*
- do_make_output_section(const char* name, elfcpp::Elf_Word type,
- elfcpp::Elf_Xword flags)
- { return new The_aarch64_output_section(name, type, flags); }
- private:
- // The class which scans relocations.
- class Scan
- {
- public:
- Scan()
- : issued_non_pic_error_(false)
- { }
- inline void
- local(Symbol_table* symtab, Layout* layout, Target_aarch64* target,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int data_shndx,
- Output_section* output_section,
- const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
- const elfcpp::Sym<size, big_endian>& lsym,
- bool is_discarded);
- inline void
- global(Symbol_table* symtab, Layout* layout, Target_aarch64* target,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int data_shndx,
- Output_section* output_section,
- const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
- Symbol* gsym);
- inline bool
- local_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
- Target_aarch64<size, big_endian>* ,
- Sized_relobj_file<size, big_endian>* ,
- unsigned int ,
- Output_section* ,
- const elfcpp::Rela<size, big_endian>& ,
- unsigned int r_type,
- const elfcpp::Sym<size, big_endian>&);
- inline bool
- global_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
- Target_aarch64<size, big_endian>* ,
- Sized_relobj_file<size, big_endian>* ,
- unsigned int ,
- Output_section* ,
- const elfcpp::Rela<size, big_endian>& ,
- unsigned int r_type,
- Symbol* gsym);
- private:
- static void
- unsupported_reloc_local(Sized_relobj_file<size, big_endian>*,
- unsigned int r_type);
- static void
- unsupported_reloc_global(Sized_relobj_file<size, big_endian>*,
- unsigned int r_type, Symbol*);
- inline bool
- possible_function_pointer_reloc(unsigned int r_type);
- void
- check_non_pic(Relobj*, unsigned int r_type);
- bool
- reloc_needs_plt_for_ifunc(Sized_relobj_file<size, big_endian>*,
- unsigned int r_type);
- // Whether we have issued an error about a non-PIC compilation.
- bool issued_non_pic_error_;
- };
- // The class which implements relocation.
- class Relocate
- {
- public:
- Relocate()
- : skip_call_tls_get_addr_(false)
- { }
- ~Relocate()
- { }
- // Do a relocation. Return false if the caller should not issue
- // any warnings about this relocation.
- inline bool
- relocate(const Relocate_info<size, big_endian>*, unsigned int,
- Target_aarch64*, Output_section*, size_t, const unsigned char*,
- const Sized_symbol<size>*, const Symbol_value<size>*,
- unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
- section_size_type);
- private:
- inline typename AArch64_relocate_functions<size, big_endian>::Status
- relocate_tls(const Relocate_info<size, big_endian>*,
- Target_aarch64<size, big_endian>*,
- size_t,
- const elfcpp::Rela<size, big_endian>&,
- unsigned int r_type, const Sized_symbol<size>*,
- const Symbol_value<size>*,
- unsigned char*,
- typename elfcpp::Elf_types<size>::Elf_Addr);
- inline typename AArch64_relocate_functions<size, big_endian>::Status
- tls_gd_to_le(
- const Relocate_info<size, big_endian>*,
- Target_aarch64<size, big_endian>*,
- const elfcpp::Rela<size, big_endian>&,
- unsigned int,
- unsigned char*,
- const Symbol_value<size>*);
- inline typename AArch64_relocate_functions<size, big_endian>::Status
- tls_ld_to_le(
- const Relocate_info<size, big_endian>*,
- Target_aarch64<size, big_endian>*,
- const elfcpp::Rela<size, big_endian>&,
- unsigned int,
- unsigned char*,
- const Symbol_value<size>*);
- inline typename AArch64_relocate_functions<size, big_endian>::Status
- tls_ie_to_le(
- const Relocate_info<size, big_endian>*,
- Target_aarch64<size, big_endian>*,
- const elfcpp::Rela<size, big_endian>&,
- unsigned int,
- unsigned char*,
- const Symbol_value<size>*);
- inline typename AArch64_relocate_functions<size, big_endian>::Status
- tls_desc_gd_to_le(
- const Relocate_info<size, big_endian>*,
- Target_aarch64<size, big_endian>*,
- const elfcpp::Rela<size, big_endian>&,
- unsigned int,
- unsigned char*,
- const Symbol_value<size>*);
- inline typename AArch64_relocate_functions<size, big_endian>::Status
- tls_desc_gd_to_ie(
- const Relocate_info<size, big_endian>*,
- Target_aarch64<size, big_endian>*,
- const elfcpp::Rela<size, big_endian>&,
- unsigned int,
- unsigned char*,
- const Symbol_value<size>*,
- typename elfcpp::Elf_types<size>::Elf_Addr,
- typename elfcpp::Elf_types<size>::Elf_Addr);
- bool skip_call_tls_get_addr_;
- }; // End of class Relocate
- // Adjust TLS relocation type based on the options and whether this
- // is a local symbol.
- static tls::Tls_optimization
- optimize_tls_reloc(bool is_final, int r_type);
- // Get the GOT section, creating it if necessary.
- Output_data_got_aarch64<size, big_endian>*
- got_section(Symbol_table*, Layout*);
- // Get the GOT PLT section.
- Output_data_space*
- got_plt_section() const
- {
- gold_assert(this->got_plt_ != NULL);
- return this->got_plt_;
- }
- // Get the GOT section for TLSDESC entries.
- Output_data_got<size, big_endian>*
- got_tlsdesc_section() const
- {
- gold_assert(this->got_tlsdesc_ != NULL);
- return this->got_tlsdesc_;
- }
- // Create the PLT section.
- void
- make_plt_section(Symbol_table* symtab, Layout* layout);
- // Create a PLT entry for a global symbol.
- void
- make_plt_entry(Symbol_table*, Layout*, Symbol*);
- // Create a PLT entry for a local STT_GNU_IFUNC symbol.
- void
- make_local_ifunc_plt_entry(Symbol_table*, Layout*,
- Sized_relobj_file<size, big_endian>* relobj,
- unsigned int local_sym_index);
- // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
- void
- define_tls_base_symbol(Symbol_table*, Layout*);
- // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
- void
- reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout);
- // Create a GOT entry for the TLS module index.
- unsigned int
- got_mod_index_entry(Symbol_table* symtab, Layout* layout,
- Sized_relobj_file<size, big_endian>* object);
- // Get the PLT section.
- Output_data_plt_aarch64<size, big_endian>*
- plt_section() const
- {
- gold_assert(this->plt_ != NULL);
- return this->plt_;
- }
- // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769. For
- // ST_E_843419, we need an additional field for adrp offset.
- void create_erratum_stub(
- AArch64_relobj<size, big_endian>* relobj,
- unsigned int shndx,
- section_size_type erratum_insn_offset,
- Address erratum_address,
- typename Insn_utilities::Insntype erratum_insn,
- int erratum_type,
- unsigned int e843419_adrp_offset=0);
- // Return whether this is a 3-insn erratum sequence.
- bool is_erratum_843419_sequence(
- typename elfcpp::Swap<32,big_endian>::Valtype insn1,
- typename elfcpp::Swap<32,big_endian>::Valtype insn2,
- typename elfcpp::Swap<32,big_endian>::Valtype insn3);
- // Return whether this is a 835769 sequence.
- // (Similarly implemented as in elfnn-aarch64.c.)
- bool is_erratum_835769_sequence(
- typename elfcpp::Swap<32,big_endian>::Valtype,
- typename elfcpp::Swap<32,big_endian>::Valtype);
- // Get the dynamic reloc section, creating it if necessary.
- Reloc_section*
- rela_dyn_section(Layout*);
- // Get the section to use for TLSDESC relocations.
- Reloc_section*
- rela_tlsdesc_section(Layout*) const;
- // Get the section to use for IRELATIVE relocations.
- Reloc_section*
- rela_irelative_section(Layout*);
- // Add a potential copy relocation.
- void
- copy_reloc(Symbol_table* symtab, Layout* layout,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int shndx, Output_section* output_section,
- Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc)
- {
- unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
- this->copy_relocs_.copy_reloc(symtab, layout,
- symtab->get_sized_symbol<size>(sym),
- object, shndx, output_section,
- r_type, reloc.get_r_offset(),
- reloc.get_r_addend(),
- this->rela_dyn_section(layout));
- }
- // Information about this specific target which we pass to the
- // general Target structure.
- static const Target::Target_info aarch64_info;
- // The types of GOT entries needed for this platform.
- // These values are exposed to the ABI in an incremental link.
- // Do not renumber existing values without changing the version
- // number of the .gnu_incremental_inputs section.
- enum Got_type
- {
- GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
- GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
- GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
- GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair
- };
- // This type is used as the argument to the target specific
- // relocation routines. The only target specific reloc is
- // R_AARCh64_TLSDESC against a local symbol.
- struct Tlsdesc_info
- {
- Tlsdesc_info(Sized_relobj_file<size, big_endian>* a_object,
- unsigned int a_r_sym)
- : object(a_object), r_sym(a_r_sym)
- { }
- // The object in which the local symbol is defined.
- Sized_relobj_file<size, big_endian>* object;
- // The local symbol index in the object.
- unsigned int r_sym;
- };
- // The GOT section.
- Output_data_got_aarch64<size, big_endian>* got_;
- // The PLT section.
- Output_data_plt_aarch64<size, big_endian>* plt_;
- // The GOT PLT section.
- Output_data_space* got_plt_;
- // The GOT section for IRELATIVE relocations.
- Output_data_space* got_irelative_;
- // The GOT section for TLSDESC relocations.
- Output_data_got<size, big_endian>* got_tlsdesc_;
- // The _GLOBAL_OFFSET_TABLE_ symbol.
- Symbol* global_offset_table_;
- // The dynamic reloc section.
- Reloc_section* rela_dyn_;
- // The section to use for IRELATIVE relocs.
- Reloc_section* rela_irelative_;
- // Relocs saved to avoid a COPY reloc.
- Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
- // Offset of the GOT entry for the TLS module index.
- unsigned int got_mod_index_offset_;
- // We handle R_AARCH64_TLSDESC against a local symbol as a target
- // specific relocation. Here we store the object and local symbol
- // index for the relocation.
- std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
- // True if the _TLS_MODULE_BASE_ symbol has been defined.
- bool tls_base_symbol_defined_;
- // List of stub_tables
- Stub_table_list stub_tables_;
- // Actual stub group size
- section_size_type stub_group_size_;
- AArch64_input_section_map aarch64_input_section_map_;
- }; // End of Target_aarch64
- template<>
- const Target::Target_info Target_aarch64<64, false>::aarch64_info =
- {
- 64, // size
- false, // is_big_endian
- elfcpp::EM_AARCH64, // machine_code
- false, // has_make_symbol
- false, // has_resolve
- false, // has_code_fill
- false, // is_default_stack_executable
- true, // can_icf_inline_merge_sections
- '\0', // wrap_char
- "/lib/ld.so.1", // program interpreter
- 0x400000, // default_text_segment_address
- 0x10000, // abi_pagesize (overridable by -z max-page-size)
- 0x1000, // common_pagesize (overridable by -z common-page-size)
- false, // isolate_execinstr
- 0, // rosegment_gap
- elfcpp::SHN_UNDEF, // small_common_shndx
- elfcpp::SHN_UNDEF, // large_common_shndx
- 0, // small_common_section_flags
- 0, // large_common_section_flags
- NULL, // attributes_section
- NULL, // attributes_vendor
- "_start", // entry_symbol_name
- 32, // hash_entry_size
- elfcpp::SHT_PROGBITS, // unwind_section_type
- };
- template<>
- const Target::Target_info Target_aarch64<32, false>::aarch64_info =
- {
- 32, // size
- false, // is_big_endian
- elfcpp::EM_AARCH64, // machine_code
- false, // has_make_symbol
- false, // has_resolve
- false, // has_code_fill
- false, // is_default_stack_executable
- false, // can_icf_inline_merge_sections
- '\0', // wrap_char
- "/lib/ld.so.1", // program interpreter
- 0x400000, // default_text_segment_address
- 0x10000, // abi_pagesize (overridable by -z max-page-size)
- 0x1000, // common_pagesize (overridable by -z common-page-size)
- false, // isolate_execinstr
- 0, // rosegment_gap
- elfcpp::SHN_UNDEF, // small_common_shndx
- elfcpp::SHN_UNDEF, // large_common_shndx
- 0, // small_common_section_flags
- 0, // large_common_section_flags
- NULL, // attributes_section
- NULL, // attributes_vendor
- "_start", // entry_symbol_name
- 32, // hash_entry_size
- elfcpp::SHT_PROGBITS, // unwind_section_type
- };
- template<>
- const Target::Target_info Target_aarch64<64, true>::aarch64_info =
- {
- 64, // size
- true, // is_big_endian
- elfcpp::EM_AARCH64, // machine_code
- false, // has_make_symbol
- false, // has_resolve
- false, // has_code_fill
- false, // is_default_stack_executable
- true, // can_icf_inline_merge_sections
- '\0', // wrap_char
- "/lib/ld.so.1", // program interpreter
- 0x400000, // default_text_segment_address
- 0x10000, // abi_pagesize (overridable by -z max-page-size)
- 0x1000, // common_pagesize (overridable by -z common-page-size)
- false, // isolate_execinstr
- 0, // rosegment_gap
- elfcpp::SHN_UNDEF, // small_common_shndx
- elfcpp::SHN_UNDEF, // large_common_shndx
- 0, // small_common_section_flags
- 0, // large_common_section_flags
- NULL, // attributes_section
- NULL, // attributes_vendor
- "_start", // entry_symbol_name
- 32, // hash_entry_size
- elfcpp::SHT_PROGBITS, // unwind_section_type
- };
- template<>
- const Target::Target_info Target_aarch64<32, true>::aarch64_info =
- {
- 32, // size
- true, // is_big_endian
- elfcpp::EM_AARCH64, // machine_code
- false, // has_make_symbol
- false, // has_resolve
- false, // has_code_fill
- false, // is_default_stack_executable
- false, // can_icf_inline_merge_sections
- '\0', // wrap_char
- "/lib/ld.so.1", // program interpreter
- 0x400000, // default_text_segment_address
- 0x10000, // abi_pagesize (overridable by -z max-page-size)
- 0x1000, // common_pagesize (overridable by -z common-page-size)
- false, // isolate_execinstr
- 0, // rosegment_gap
- elfcpp::SHN_UNDEF, // small_common_shndx
- elfcpp::SHN_UNDEF, // large_common_shndx
- 0, // small_common_section_flags
- 0, // large_common_section_flags
- NULL, // attributes_section
- NULL, // attributes_vendor
- "_start", // entry_symbol_name
- 32, // hash_entry_size
- elfcpp::SHT_PROGBITS, // unwind_section_type
- };
- // Get the GOT section, creating it if necessary.
- template<int size, bool big_endian>
- Output_data_got_aarch64<size, big_endian>*
- Target_aarch64<size, big_endian>::got_section(Symbol_table* symtab,
- Layout* layout)
- {
- if (this->got_ == NULL)
- {
- gold_assert(symtab != NULL && layout != NULL);
- // When using -z now, we can treat .got.plt as a relro section.
- // Without -z now, it is modified after program startup by lazy
- // PLT relocations.
- bool is_got_plt_relro = parameters->options().now();
- Output_section_order got_order = (is_got_plt_relro
- ? ORDER_RELRO
- : ORDER_RELRO_LAST);
- Output_section_order got_plt_order = (is_got_plt_relro
- ? ORDER_RELRO
- : ORDER_NON_RELRO_FIRST);
- // Layout of .got and .got.plt sections.
- // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
- // ...
- // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
- // .gotplt[1] reserved for ld.so (resolver)
- // .gotplt[2] reserved
- // Generate .got section.
- this->got_ = new Output_data_got_aarch64<size, big_endian>(symtab,
- layout);
- layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
- (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
- this->got_, got_order, true);
- // The first word of GOT is reserved for the address of .dynamic.
- // We put 0 here now. The value will be replaced later in
- // Output_data_got_aarch64::do_write.
- this->got_->add_constant(0);
- // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
- // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
- // even if there is a .got.plt section.
- this->global_offset_table_ =
- symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
- Symbol_table::PREDEFINED,
- this->got_,
- 0, 0, elfcpp::STT_OBJECT,
- elfcpp::STB_LOCAL,
- elfcpp::STV_HIDDEN, 0,
- false, false);
- // Generate .got.plt section.
- this->got_plt_ = new Output_data_space(size / 8, "** GOT PLT");
- layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
- (elfcpp::SHF_ALLOC
- | elfcpp::SHF_WRITE),
- this->got_plt_, got_plt_order,
- is_got_plt_relro);
- // The first three entries are reserved.
- this->got_plt_->set_current_data_size(
- AARCH64_GOTPLT_RESERVE_COUNT * (size / 8));
- // If there are any IRELATIVE relocations, they get GOT entries
- // in .got.plt after the jump slot entries.
- this->got_irelative_ = new Output_data_space(size / 8,
- "** GOT IRELATIVE PLT");
- layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
- (elfcpp::SHF_ALLOC
- | elfcpp::SHF_WRITE),
- this->got_irelative_,
- got_plt_order,
- is_got_plt_relro);
- // If there are any TLSDESC relocations, they get GOT entries in
- // .got.plt after the jump slot and IRELATIVE entries.
- this->got_tlsdesc_ = new Output_data_got<size, big_endian>();
- layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
- (elfcpp::SHF_ALLOC
- | elfcpp::SHF_WRITE),
- this->got_tlsdesc_,
- got_plt_order,
- is_got_plt_relro);
- if (!is_got_plt_relro)
- {
- // Those bytes can go into the relro segment.
- layout->increase_relro(
- AARCH64_GOTPLT_RESERVE_COUNT * (size / 8));
- }
- }
- return this->got_;
- }
- // Get the dynamic reloc section, creating it if necessary.
- template<int size, bool big_endian>
- typename Target_aarch64<size, big_endian>::Reloc_section*
- Target_aarch64<size, big_endian>::rela_dyn_section(Layout* layout)
- {
- if (this->rela_dyn_ == NULL)
- {
- gold_assert(layout != NULL);
- this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
- layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
- elfcpp::SHF_ALLOC, this->rela_dyn_,
- ORDER_DYNAMIC_RELOCS, false);
- }
- return this->rela_dyn_;
- }
- // Get the section to use for IRELATIVE relocs, creating it if
- // necessary. These go in .rela.dyn, but only after all other dynamic
- // relocations. They need to follow the other dynamic relocations so
- // that they can refer to global variables initialized by those
- // relocs.
- template<int size, bool big_endian>
- typename Target_aarch64<size, big_endian>::Reloc_section*
- Target_aarch64<size, big_endian>::rela_irelative_section(Layout* layout)
- {
- if (this->rela_irelative_ == NULL)
- {
- // Make sure we have already created the dynamic reloc section.
- this->rela_dyn_section(layout);
- this->rela_irelative_ = new Reloc_section(false);
- layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
- elfcpp::SHF_ALLOC, this->rela_irelative_,
- ORDER_DYNAMIC_RELOCS, false);
- gold_assert(this->rela_dyn_->output_section()
- == this->rela_irelative_->output_section());
- }
- return this->rela_irelative_;
- }
- // do_make_elf_object to override the same function in the base class. We need
- // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
- // store backend specific information. Hence we need to have our own ELF object
- // creation.
- template<int size, bool big_endian>
- Object*
- Target_aarch64<size, big_endian>::do_make_elf_object(
- const std::string& name,
- Input_file* input_file,
- off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr)
- {
- int et = ehdr.get_e_type();
- // ET_EXEC files are valid input for --just-symbols/-R,
- // and we treat them as relocatable objects.
- if (et == elfcpp::ET_EXEC && input_file->just_symbols())
- return Sized_target<size, big_endian>::do_make_elf_object(
- name, input_file, offset, ehdr);
- else if (et == elfcpp::ET_REL)
- {
- AArch64_relobj<size, big_endian>* obj =
- new AArch64_relobj<size, big_endian>(name, input_file, offset, ehdr);
- obj->setup();
- return obj;
- }
- else if (et == elfcpp::ET_DYN)
- {
- // Keep base implementation.
- Sized_dynobj<size, big_endian>* obj =
- new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr);
- obj->setup();
- return obj;
- }
- else
- {
- gold_error(_("%s: unsupported ELF file type %d"),
- name.c_str(), et);
- return NULL;
- }
- }
- // Scan a relocation for stub generation.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::scan_reloc_for_stub(
- const Relocate_info<size, big_endian>* relinfo,
- unsigned int r_type,
- const Sized_symbol<size>* gsym,
- unsigned int r_sym,
- const Symbol_value<size>* psymval,
- typename elfcpp::Elf_types<size>::Elf_Swxword addend,
- Address address)
- {
- const AArch64_relobj<size, big_endian>* aarch64_relobj =
- static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object);
- Symbol_value<size> symval;
- if (gsym != NULL)
- {
- const AArch64_reloc_property* arp = aarch64_reloc_property_table->
- get_reloc_property(r_type);
- if (gsym->use_plt_offset(arp->reference_flags()))
- {
- // This uses a PLT, change the symbol value.
- symval.set_output_value(this->plt_address_for_global(gsym));
- psymval = &symval;
- }
- else if (gsym->is_undefined())
- {
- // There is no need to generate a stub symbol if the original symbol
- // is undefined.
- gold_debug(DEBUG_TARGET,
- "stub: not creating a stub for undefined symbol %s in file %s",
- gsym->name(), aarch64_relobj->name().c_str());
- return;
- }
- }
- // Get the symbol value.
- typename Symbol_value<size>::Value value = psymval->value(aarch64_relobj, 0);
- // Owing to pipelining, the PC relative branches below actually skip
- // two instructions when the branch offset is 0.
- Address destination = static_cast<Address>(-1);
- switch (r_type)
- {
- case elfcpp::R_AARCH64_CALL26:
- case elfcpp::R_AARCH64_JUMP26:
- destination = value + addend;
- break;
- default:
- gold_unreachable();
- }
- int stub_type = The_reloc_stub::
- stub_type_for_reloc(r_type, address, destination);
- if (stub_type == ST_NONE)
- return;
- The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx);
- gold_assert(stub_table != NULL);
- The_reloc_stub_key key(stub_type, gsym, aarch64_relobj, r_sym, addend);
- The_reloc_stub* stub = stub_table->find_reloc_stub(key);
- if (stub == NULL)
- {
- stub = new The_reloc_stub(stub_type);
- stub_table->add_reloc_stub(stub, key);
- }
- stub->set_destination_address(destination);
- } // End of Target_aarch64::scan_reloc_for_stub
- // This function scans a relocation section for stub generation.
- // The template parameter Relocate must be a class type which provides
- // a single function, relocate(), which implements the machine
- // specific part of a relocation.
- // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
- // SHT_REL or SHT_RELA.
- // PRELOCS points to the relocation data. RELOC_COUNT is the number
- // of relocs. OUTPUT_SECTION is the output section.
- // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
- // mapped to output offsets.
- // VIEW is the section data, VIEW_ADDRESS is its memory address, and
- // VIEW_SIZE is the size. These refer to the input section, unless
- // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
- // the output section.
- template<int size, bool big_endian>
- template<int sh_type>
- void inline
- Target_aarch64<size, big_endian>::scan_reloc_section_for_stubs(
- const Relocate_info<size, big_endian>* relinfo,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* /*output_section*/,
- bool /*needs_special_offset_handling*/,
- const unsigned char* /*view*/,
- Address view_address,
- section_size_type)
- {
- typedef typename Reloc_types<sh_type,size,big_endian>::Reloc Reltype;
- const int reloc_size =
- Reloc_types<sh_type,size,big_endian>::reloc_size;
- AArch64_relobj<size, big_endian>* object =
- static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object);
- unsigned int local_count = object->local_symbol_count();
- gold::Default_comdat_behavior default_comdat_behavior;
- Comdat_behavior comdat_behavior = CB_UNDETERMINED;
- for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
- {
- Reltype reloc(prelocs);
- typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
- unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
- unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
- if (r_type != elfcpp::R_AARCH64_CALL26
- && r_type != elfcpp::R_AARCH64_JUMP26)
- continue;
- section_offset_type offset =
- convert_to_section_size_type(reloc.get_r_offset());
- // Get the addend.
- typename elfcpp::Elf_types<size>::Elf_Swxword addend =
- reloc.get_r_addend();
- const Sized_symbol<size>* sym;
- Symbol_value<size> symval;
- const Symbol_value<size> *psymval;
- bool is_defined_in_discarded_section;
- unsigned int shndx;
- const Symbol* gsym = NULL;
- if (r_sym < local_count)
- {
- sym = NULL;
- psymval = object->local_symbol(r_sym);
- // If the local symbol belongs to a section we are discarding,
- // and that section is a debug section, try to find the
- // corresponding kept section and map this symbol to its
- // counterpart in the kept section. The symbol must not
- // correspond to a section we are folding.
- bool is_ordinary;
- shndx = psymval->input_shndx(&is_ordinary);
- is_defined_in_discarded_section =
- (is_ordinary
- && shndx != elfcpp::SHN_UNDEF
- && !object->is_section_included(shndx)
- && !relinfo->symtab->is_section_folded(object, shndx));
- // We need to compute the would-be final value of this local
- // symbol.
- if (!is_defined_in_discarded_section)
- {
- typedef Sized_relobj_file<size, big_endian> ObjType;
- if (psymval->is_section_symbol())
- symval.set_is_section_symbol();
- typename ObjType::Compute_final_local_value_status status =
- object->compute_final_local_value(r_sym, psymval, &symval,
- relinfo->symtab);
- if (status == ObjType::CFLV_OK)
- {
- // Currently we cannot handle a branch to a target in
- // a merged section. If this is the case, issue an error
- // and also free the merge symbol value.
- if (!symval.has_output_value())
- {
- const std::string& section_name =
- object->section_name(shndx);
- object->error(_("cannot handle branch to local %u "
- "in a merged section %s"),
- r_sym, section_name.c_str());
- }
- psymval = &symval;
- }
- else
- {
- // We cannot determine the final value.
- continue;
- }
- }
- }
- else
- {
- gsym = object->global_symbol(r_sym);
- gold_assert(gsym != NULL);
- if (gsym->is_forwarder())
- gsym = relinfo->symtab->resolve_forwards(gsym);
- sym = static_cast<const Sized_symbol<size>*>(gsym);
- if (sym->has_symtab_index() && sym->symtab_index() != -1U)
- symval.set_output_symtab_index(sym->symtab_index());
- else
- symval.set_no_output_symtab_entry();
- // We need to compute the would-be final value of this global
- // symbol.
- const Symbol_table* symtab = relinfo->symtab;
- const Sized_symbol<size>* sized_symbol =
- symtab->get_sized_symbol<size>(gsym);
- Symbol_table::Compute_final_value_status status;
- typename elfcpp::Elf_types<size>::Elf_Addr value =
- symtab->compute_final_value<size>(sized_symbol, &status);
- // Skip this if the symbol has not output section.
- if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION)
- continue;
- symval.set_output_value(value);
- if (gsym->type() == elfcpp::STT_TLS)
- symval.set_is_tls_symbol();
- else if (gsym->type() == elfcpp::STT_GNU_IFUNC)
- symval.set_is_ifunc_symbol();
- psymval = &symval;
- is_defined_in_discarded_section =
- (gsym->is_defined_in_discarded_section()
- && gsym->is_undefined());
- shndx = 0;
- }
- Symbol_value<size> symval2;
- if (is_defined_in_discarded_section)
- {
- std::string name = object->section_name(relinfo->data_shndx);
- if (comdat_behavior == CB_UNDETERMINED)
- comdat_behavior = default_comdat_behavior.get(name.c_str());
- if (comdat_behavior == CB_PRETEND)
- {
- bool found;
- typename elfcpp::Elf_types<size>::Elf_Addr value =
- object->map_to_kept_section(shndx, name, &found);
- if (found)
- symval2.set_output_value(value + psymval->input_value());
- else
- symval2.set_output_value(0);
- }
- else
- {
- if (comdat_behavior == CB_ERROR)
- issue_discarded_error(relinfo, i, offset, r_sym, gsym);
- symval2.set_output_value(0);
- }
- symval2.set_no_output_symtab_entry();
- psymval = &symval2;
- }
- this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval,
- addend, view_address + offset);
- } // End of iterating relocs in a section
- } // End of Target_aarch64::scan_reloc_section_for_stubs
- // Scan an input section for stub generation.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::scan_section_for_stubs(
- const Relocate_info<size, big_endian>* relinfo,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- const unsigned char* view,
- Address view_address,
- section_size_type view_size)
- {
- gold_assert(sh_type == elfcpp::SHT_RELA);
- this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>(
- relinfo,
- prelocs,
- reloc_count,
- output_section,
- needs_special_offset_handling,
- view,
- view_address,
- view_size);
- }
- // Relocate a single reloc stub.
- template<int size, bool big_endian>
- void Target_aarch64<size, big_endian>::
- relocate_reloc_stub(The_reloc_stub* stub,
- const The_relocate_info*,
- Output_section*,
- unsigned char* view,
- Address address,
- section_size_type)
- {
- typedef AArch64_relocate_functions<size, big_endian> The_reloc_functions;
- typedef typename The_reloc_functions::Status The_reloc_functions_status;
- typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
- Insntype* ip = reinterpret_cast<Insntype*>(view);
- int insn_number = stub->insn_num();
- const uint32_t* insns = stub->insns();
- // Check the insns are really those stub insns.
- for (int i = 0; i < insn_number; ++i)
- {
- Insntype insn = elfcpp::Swap<32,big_endian>::readval(ip + i);
- gold_assert(((uint32_t)insn == insns[i]));
- }
- Address dest = stub->destination_address();
- switch(stub->type())
- {
- case ST_ADRP_BRANCH:
- {
- // 1st reloc is ADR_PREL_PG_HI21
- The_reloc_functions_status status =
- The_reloc_functions::adrp(view, dest, address);
- // An error should never arise in the above step. If so, please
- // check 'aarch64_valid_for_adrp_p'.
- gold_assert(status == The_reloc_functions::STATUS_OKAY);
- // 2nd reloc is ADD_ABS_LO12_NC
- const AArch64_reloc_property* arp =
- aarch64_reloc_property_table->get_reloc_property(
- elfcpp::R_AARCH64_ADD_ABS_LO12_NC);
- gold_assert(arp != NULL);
- status = The_reloc_functions::template
- rela_general<32>(view + 4, dest, 0, arp);
- // An error should never arise, it is an "_NC" relocation.
- gold_assert(status == The_reloc_functions::STATUS_OKAY);
- }
- break;
- case ST_LONG_BRANCH_ABS:
- // 1st reloc is R_AARCH64_PREL64, at offset 8
- elfcpp::Swap<64,big_endian>::writeval(view + 8, dest);
- break;
- case ST_LONG_BRANCH_PCREL:
- {
- // "PC" calculation is the 2nd insn in the stub.
- uint64_t offset = dest - (address + 4);
- // Offset is placed at offset 4 and 5.
- elfcpp::Swap<64,big_endian>::writeval(view + 16, offset);
- }
- break;
- default:
- gold_unreachable();
- }
- }
- // A class to handle the PLT data.
- // This is an abstract base class that handles most of the linker details
- // but does not know the actual contents of PLT entries. The derived
- // classes below fill in those details.
- template<int size, bool big_endian>
- class Output_data_plt_aarch64 : public Output_section_data
- {
- public:
- typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
- Reloc_section;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
- Output_data_plt_aarch64(Layout* layout,
- uint64_t addralign,
- Output_data_got_aarch64<size, big_endian>* got,
- Output_data_space* got_plt,
- Output_data_space* got_irelative)
- : Output_section_data(addralign), tlsdesc_rel_(NULL), irelative_rel_(NULL),
- got_(got), got_plt_(got_plt), got_irelative_(got_irelative),
- count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
- { this->init(layout); }
- // Initialize the PLT section.
- void
- init(Layout* layout);
- // Add an entry to the PLT.
- void
- add_entry(Symbol_table*, Layout*, Symbol* gsym);
- // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
- unsigned int
- add_local_ifunc_entry(Symbol_table* symtab, Layout*,
- Sized_relobj_file<size, big_endian>* relobj,
- unsigned int local_sym_index);
- // Add the relocation for a PLT entry.
- void
- add_relocation(Symbol_table*, Layout*, Symbol* gsym,
- unsigned int got_offset);
- // Add the reserved TLSDESC_PLT entry to the PLT.
- void
- reserve_tlsdesc_entry(unsigned int got_offset)
- { this->tlsdesc_got_offset_ = got_offset; }
- // Return true if a TLSDESC_PLT entry has been reserved.
- bool
- has_tlsdesc_entry() const
- { return this->tlsdesc_got_offset_ != -1U; }
- // Return the GOT offset for the reserved TLSDESC_PLT entry.
- unsigned int
- get_tlsdesc_got_offset() const
- { return this->tlsdesc_got_offset_; }
- // Return the PLT offset of the reserved TLSDESC_PLT entry.
- unsigned int
- get_tlsdesc_plt_offset() const
- {
- return (this->first_plt_entry_offset() +
- (this->count_ + this->irelative_count_)
- * this->get_plt_entry_size());
- }
- // Return the .rela.plt section data.
- Reloc_section*
- rela_plt()
- { return this->rel_; }
- // Return where the TLSDESC relocations should go.
- Reloc_section*
- rela_tlsdesc(Layout*);
- // Return where the IRELATIVE relocations should go in the PLT
- // relocations.
- Reloc_section*
- rela_irelative(Symbol_table*, Layout*);
- // Return whether we created a section for IRELATIVE relocations.
- bool
- has_irelative_section() const
- { return this->irelative_rel_ != NULL; }
- // Return the number of PLT entries.
- unsigned int
- entry_count() const
- { return this->count_ + this->irelative_count_; }
- // Return the offset of the first non-reserved PLT entry.
- unsigned int
- first_plt_entry_offset() const
- { return this->do_first_plt_entry_offset(); }
- // Return the size of a PLT entry.
- unsigned int
- get_plt_entry_size() const
- { return this->do_get_plt_entry_size(); }
- // Return the reserved tlsdesc entry size.
- unsigned int
- get_plt_tlsdesc_entry_size() const
- { return this->do_get_plt_tlsdesc_entry_size(); }
- // Return the PLT address to use for a global symbol.
- uint64_t
- address_for_global(const Symbol*);
- // Return the PLT address to use for a local symbol.
- uint64_t
- address_for_local(const Relobj*, unsigned int symndx);
- protected:
- // Fill in the first PLT entry.
- void
- fill_first_plt_entry(unsigned char* pov,
- Address got_address,
- Address plt_address)
- { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
- // Fill in a normal PLT entry.
- void
- fill_plt_entry(unsigned char* pov,
- Address got_address,
- Address plt_address,
- unsigned int got_offset,
- unsigned int plt_offset)
- {
- this->do_fill_plt_entry(pov, got_address, plt_address,
- got_offset, plt_offset);
- }
- // Fill in the reserved TLSDESC PLT entry.
- void
- fill_tlsdesc_entry(unsigned char* pov,
- Address gotplt_address,
- Address plt_address,
- Address got_base,
- unsigned int tlsdesc_got_offset,
- unsigned int plt_offset)
- {
- this->do_fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base,
- tlsdesc_got_offset, plt_offset);
- }
- virtual unsigned int
- do_first_plt_entry_offset() const = 0;
- virtual unsigned int
- do_get_plt_entry_size() const = 0;
- virtual unsigned int
- do_get_plt_tlsdesc_entry_size() const = 0;
- virtual void
- do_fill_first_plt_entry(unsigned char* pov,
- Address got_addr,
- Address plt_addr) = 0;
- virtual void
- do_fill_plt_entry(unsigned char* pov,
- Address got_address,
- Address plt_address,
- unsigned int got_offset,
- unsigned int plt_offset) = 0;
- virtual void
- do_fill_tlsdesc_entry(unsigned char* pov,
- Address gotplt_address,
- Address plt_address,
- Address got_base,
- unsigned int tlsdesc_got_offset,
- unsigned int plt_offset) = 0;
- void
- do_adjust_output_section(Output_section* os);
- // Write to a map file.
- void
- do_print_to_mapfile(Mapfile* mapfile) const
- { mapfile->print_output_data(this, _("** PLT")); }
- private:
- // Set the final size.
- void
- set_final_data_size();
- // Write out the PLT data.
- void
- do_write(Output_file*);
- // The reloc section.
- Reloc_section* rel_;
- // The TLSDESC relocs, if necessary. These must follow the regular
- // PLT relocs.
- Reloc_section* tlsdesc_rel_;
- // The IRELATIVE relocs, if necessary. These must follow the
- // regular PLT relocations.
- Reloc_section* irelative_rel_;
- // The .got section.
- Output_data_got_aarch64<size, big_endian>* got_;
- // The .got.plt section.
- Output_data_space* got_plt_;
- // The part of the .got.plt section used for IRELATIVE relocs.
- Output_data_space* got_irelative_;
- // The number of PLT entries.
- unsigned int count_;
- // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These
- // follow the regular PLT entries.
- unsigned int irelative_count_;
- // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
- // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
- // indicates an offset is not allocated.
- unsigned int tlsdesc_got_offset_;
- };
- // Initialize the PLT section.
- template<int size, bool big_endian>
- void
- Output_data_plt_aarch64<size, big_endian>::init(Layout* layout)
- {
- this->rel_ = new Reloc_section(false);
- layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
- elfcpp::SHF_ALLOC, this->rel_,
- ORDER_DYNAMIC_PLT_RELOCS, false);
- }
- template<int size, bool big_endian>
- void
- Output_data_plt_aarch64<size, big_endian>::do_adjust_output_section(
- Output_section* os)
- {
- os->set_entsize(this->get_plt_entry_size());
- }
- // Add an entry to the PLT.
- template<int size, bool big_endian>
- void
- Output_data_plt_aarch64<size, big_endian>::add_entry(Symbol_table* symtab,
- Layout* layout, Symbol* gsym)
- {
- gold_assert(!gsym->has_plt_offset());
- unsigned int* pcount;
- unsigned int plt_reserved;
- Output_section_data_build* got;
- if (gsym->type() == elfcpp::STT_GNU_IFUNC
- && gsym->can_use_relative_reloc(false))
- {
- pcount = &this->irelative_count_;
- plt_reserved = 0;
- got = this->got_irelative_;
- }
- else
- {
- pcount = &this->count_;
- plt_reserved = this->first_plt_entry_offset();
- got = this->got_plt_;
- }
- gsym->set_plt_offset((*pcount) * this->get_plt_entry_size()
- + plt_reserved);
- ++*pcount;
- section_offset_type got_offset = got->current_data_size();
- // Every PLT entry needs a GOT entry which points back to the PLT
- // entry (this will be changed by the dynamic linker, normally
- // lazily when the function is called).
- got->set_current_data_size(got_offset + size / 8);
- // Every PLT entry needs a reloc.
- this->add_relocation(symtab, layout, gsym, got_offset);
- // Note that we don't need to save the symbol. The contents of the
- // PLT are independent of which symbols are used. The symbols only
- // appear in the relocations.
- }
- // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
- // the PLT offset.
- template<int size, bool big_endian>
- unsigned int
- Output_data_plt_aarch64<size, big_endian>::add_local_ifunc_entry(
- Symbol_table* symtab,
- Layout* layout,
- Sized_relobj_file<size, big_endian>* relobj,
- unsigned int local_sym_index)
- {
- unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size();
- ++this->irelative_count_;
- section_offset_type got_offset = this->got_irelative_->current_data_size();
- // Every PLT entry needs a GOT entry which points back to the PLT
- // entry.
- this->got_irelative_->set_current_data_size(got_offset + size / 8);
- // Every PLT entry needs a reloc.
- Reloc_section* rela = this->rela_irelative(symtab, layout);
- rela->add_symbolless_local_addend(relobj, local_sym_index,
- elfcpp::R_AARCH64_IRELATIVE,
- this->got_irelative_, got_offset, 0);
- return plt_offset;
- }
- // Add the relocation for a PLT entry.
- template<int size, bool big_endian>
- void
- Output_data_plt_aarch64<size, big_endian>::add_relocation(
- Symbol_table* symtab, Layout* layout, Symbol* gsym, unsigned int got_offset)
- {
- if (gsym->type() == elfcpp::STT_GNU_IFUNC
- && gsym->can_use_relative_reloc(false))
- {
- Reloc_section* rela = this->rela_irelative(symtab, layout);
- rela->add_symbolless_global_addend(gsym, elfcpp::R_AARCH64_IRELATIVE,
- this->got_irelative_, got_offset, 0);
- }
- else
- {
- gsym->set_needs_dynsym_entry();
- this->rel_->add_global(gsym, elfcpp::R_AARCH64_JUMP_SLOT, this->got_plt_,
- got_offset, 0);
- }
- }
- // Return where the TLSDESC relocations should go, creating it if
- // necessary. These follow the JUMP_SLOT relocations.
- template<int size, bool big_endian>
- typename Output_data_plt_aarch64<size, big_endian>::Reloc_section*
- Output_data_plt_aarch64<size, big_endian>::rela_tlsdesc(Layout* layout)
- {
- if (this->tlsdesc_rel_ == NULL)
- {
- this->tlsdesc_rel_ = new Reloc_section(false);
- layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
- elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
- ORDER_DYNAMIC_PLT_RELOCS, false);
- gold_assert(this->tlsdesc_rel_->output_section()
- == this->rel_->output_section());
- }
- return this->tlsdesc_rel_;
- }
- // Return where the IRELATIVE relocations should go in the PLT. These
- // follow the JUMP_SLOT and the TLSDESC relocations.
- template<int size, bool big_endian>
- typename Output_data_plt_aarch64<size, big_endian>::Reloc_section*
- Output_data_plt_aarch64<size, big_endian>::rela_irelative(Symbol_table* symtab,
- Layout* layout)
- {
- if (this->irelative_rel_ == NULL)
- {
- // Make sure we have a place for the TLSDESC relocations, in
- // case we see any later on.
- this->rela_tlsdesc(layout);
- this->irelative_rel_ = new Reloc_section(false);
- layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
- elfcpp::SHF_ALLOC, this->irelative_rel_,
- ORDER_DYNAMIC_PLT_RELOCS, false);
- gold_assert(this->irelative_rel_->output_section()
- == this->rel_->output_section());
- if (parameters->doing_static_link())
- {
- // A statically linked executable will only have a .rela.plt
- // section to hold R_AARCH64_IRELATIVE relocs for
- // STT_GNU_IFUNC symbols. The library will use these
- // symbols to locate the IRELATIVE relocs at program startup
- // time.
- symtab->define_in_output_data("__rela_iplt_start", NULL,
- Symbol_table::PREDEFINED,
- this->irelative_rel_, 0, 0,
- elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
- elfcpp::STV_HIDDEN, 0, false, true);
- symtab->define_in_output_data("__rela_iplt_end", NULL,
- Symbol_table::PREDEFINED,
- this->irelative_rel_, 0, 0,
- elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
- elfcpp::STV_HIDDEN, 0, true, true);
- }
- }
- return this->irelative_rel_;
- }
- // Return the PLT address to use for a global symbol.
- template<int size, bool big_endian>
- uint64_t
- Output_data_plt_aarch64<size, big_endian>::address_for_global(
- const Symbol* gsym)
- {
- uint64_t offset = 0;
- if (gsym->type() == elfcpp::STT_GNU_IFUNC
- && gsym->can_use_relative_reloc(false))
- offset = (this->first_plt_entry_offset() +
- this->count_ * this->get_plt_entry_size());
- return this->address() + offset + gsym->plt_offset();
- }
- // Return the PLT address to use for a local symbol. These are always
- // IRELATIVE relocs.
- template<int size, bool big_endian>
- uint64_t
- Output_data_plt_aarch64<size, big_endian>::address_for_local(
- const Relobj* object,
- unsigned int r_sym)
- {
- return (this->address()
- + this->first_plt_entry_offset()
- + this->count_ * this->get_plt_entry_size()
- + object->local_plt_offset(r_sym));
- }
- // Set the final size.
- template<int size, bool big_endian>
- void
- Output_data_plt_aarch64<size, big_endian>::set_final_data_size()
- {
- unsigned int count = this->count_ + this->irelative_count_;
- unsigned int extra_size = 0;
- if (this->has_tlsdesc_entry())
- extra_size += this->get_plt_tlsdesc_entry_size();
- this->set_data_size(this->first_plt_entry_offset()
- + count * this->get_plt_entry_size()
- + extra_size);
- }
- template<int size, bool big_endian>
- class Output_data_plt_aarch64_standard :
- public Output_data_plt_aarch64<size, big_endian>
- {
- public:
- typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
- Output_data_plt_aarch64_standard(
- Layout* layout,
- Output_data_got_aarch64<size, big_endian>* got,
- Output_data_space* got_plt,
- Output_data_space* got_irelative)
- : Output_data_plt_aarch64<size, big_endian>(layout,
- size == 32 ? 4 : 8,
- got, got_plt,
- got_irelative)
- { }
- protected:
- // Return the offset of the first non-reserved PLT entry.
- virtual unsigned int
- do_first_plt_entry_offset() const
- { return this->first_plt_entry_size; }
- // Return the size of a PLT entry
- virtual unsigned int
- do_get_plt_entry_size() const
- { return this->plt_entry_size; }
- // Return the size of a tlsdesc entry
- virtual unsigned int
- do_get_plt_tlsdesc_entry_size() const
- { return this->plt_tlsdesc_entry_size; }
- virtual void
- do_fill_first_plt_entry(unsigned char* pov,
- Address got_address,
- Address plt_address);
- virtual void
- do_fill_plt_entry(unsigned char* pov,
- Address got_address,
- Address plt_address,
- unsigned int got_offset,
- unsigned int plt_offset);
- virtual void
- do_fill_tlsdesc_entry(unsigned char* pov,
- Address gotplt_address,
- Address plt_address,
- Address got_base,
- unsigned int tlsdesc_got_offset,
- unsigned int plt_offset);
- private:
- // The size of the first plt entry size.
- static const int first_plt_entry_size = 32;
- // The size of the plt entry size.
- static const int plt_entry_size = 16;
- // The size of the plt tlsdesc entry size.
- static const int plt_tlsdesc_entry_size = 32;
- // Template for the first PLT entry.
- static const uint32_t first_plt_entry[first_plt_entry_size / 4];
- // Template for subsequent PLT entries.
- static const uint32_t plt_entry[plt_entry_size / 4];
- // The reserved TLSDESC entry in the PLT for an executable.
- static const uint32_t tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4];
- };
- // The first entry in the PLT for an executable.
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<32, false>::
- first_plt_entry[first_plt_entry_size / 4] =
- {
- 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
- 0x90000010, /* adrp x16, PLT_GOT+0x8 */
- 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
- 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
- 0xd61f0220, /* br x17 */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- };
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<32, true>::
- first_plt_entry[first_plt_entry_size / 4] =
- {
- 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
- 0x90000010, /* adrp x16, PLT_GOT+0x8 */
- 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
- 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
- 0xd61f0220, /* br x17 */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- };
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<64, false>::
- first_plt_entry[first_plt_entry_size / 4] =
- {
- 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
- 0x90000010, /* adrp x16, PLT_GOT+16 */
- 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
- 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
- 0xd61f0220, /* br x17 */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- };
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<64, true>::
- first_plt_entry[first_plt_entry_size / 4] =
- {
- 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
- 0x90000010, /* adrp x16, PLT_GOT+16 */
- 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
- 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
- 0xd61f0220, /* br x17 */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- };
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<32, false>::
- plt_entry[plt_entry_size / 4] =
- {
- 0x90000010, /* adrp x16, PLTGOT + n * 4 */
- 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
- 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
- 0xd61f0220, /* br x17. */
- };
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<32, true>::
- plt_entry[plt_entry_size / 4] =
- {
- 0x90000010, /* adrp x16, PLTGOT + n * 4 */
- 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
- 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
- 0xd61f0220, /* br x17. */
- };
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<64, false>::
- plt_entry[plt_entry_size / 4] =
- {
- 0x90000010, /* adrp x16, PLTGOT + n * 8 */
- 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
- 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
- 0xd61f0220, /* br x17. */
- };
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<64, true>::
- plt_entry[plt_entry_size / 4] =
- {
- 0x90000010, /* adrp x16, PLTGOT + n * 8 */
- 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
- 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
- 0xd61f0220, /* br x17. */
- };
- template<int size, bool big_endian>
- void
- Output_data_plt_aarch64_standard<size, big_endian>::do_fill_first_plt_entry(
- unsigned char* pov,
- Address got_address,
- Address plt_address)
- {
- // PLT0 of the small PLT looks like this in ELF64 -
- // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
- // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
- // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
- // symbol resolver
- // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
- // GOTPLT entry for this.
- // br x17
- // PLT0 will be slightly different in ELF32 due to different got entry
- // size.
- memcpy(pov, this->first_plt_entry, this->first_plt_entry_size);
- Address gotplt_2nd_ent = got_address + (size / 8) * 2;
- // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
- // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
- // FIXME: This only works for 64bit
- AArch64_relocate_functions<size, big_endian>::adrp(pov + 4,
- gotplt_2nd_ent, plt_address + 4);
- // Fill in R_AARCH64_LDST8_LO12
- elfcpp::Swap<32, big_endian>::writeval(
- pov + 8,
- ((this->first_plt_entry[2] & 0xffc003ff)
- | ((gotplt_2nd_ent & 0xff8) << 7)));
- // Fill in R_AARCH64_ADD_ABS_LO12
- elfcpp::Swap<32, big_endian>::writeval(
- pov + 12,
- ((this->first_plt_entry[3] & 0xffc003ff)
- | ((gotplt_2nd_ent & 0xfff) << 10)));
- }
- // Subsequent entries in the PLT for an executable.
- // FIXME: This only works for 64bit
- template<int size, bool big_endian>
- void
- Output_data_plt_aarch64_standard<size, big_endian>::do_fill_plt_entry(
- unsigned char* pov,
- Address got_address,
- Address plt_address,
- unsigned int got_offset,
- unsigned int plt_offset)
- {
- memcpy(pov, this->plt_entry, this->plt_entry_size);
- Address gotplt_entry_address = got_address + got_offset;
- Address plt_entry_address = plt_address + plt_offset;
- // Fill in R_AARCH64_PCREL_ADR_HI21
- AArch64_relocate_functions<size, big_endian>::adrp(
- pov,
- gotplt_entry_address,
- plt_entry_address);
- // Fill in R_AARCH64_LDST64_ABS_LO12
- elfcpp::Swap<32, big_endian>::writeval(
- pov + 4,
- ((this->plt_entry[1] & 0xffc003ff)
- | ((gotplt_entry_address & 0xff8) << 7)));
- // Fill in R_AARCH64_ADD_ABS_LO12
- elfcpp::Swap<32, big_endian>::writeval(
- pov + 8,
- ((this->plt_entry[2] & 0xffc003ff)
- | ((gotplt_entry_address & 0xfff) <<10)));
- }
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<32, false>::
- tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
- {
- 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
- 0x90000002, /* adrp x2, 0 */
- 0x90000003, /* adrp x3, 0 */
- 0xb9400042, /* ldr w2, [w2, #0] */
- 0x11000063, /* add w3, w3, 0 */
- 0xd61f0040, /* br x2 */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- };
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<32, true>::
- tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
- {
- 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
- 0x90000002, /* adrp x2, 0 */
- 0x90000003, /* adrp x3, 0 */
- 0xb9400042, /* ldr w2, [w2, #0] */
- 0x11000063, /* add w3, w3, 0 */
- 0xd61f0040, /* br x2 */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- };
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<64, false>::
- tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
- {
- 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
- 0x90000002, /* adrp x2, 0 */
- 0x90000003, /* adrp x3, 0 */
- 0xf9400042, /* ldr x2, [x2, #0] */
- 0x91000063, /* add x3, x3, 0 */
- 0xd61f0040, /* br x2 */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- };
- template<>
- const uint32_t
- Output_data_plt_aarch64_standard<64, true>::
- tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
- {
- 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
- 0x90000002, /* adrp x2, 0 */
- 0x90000003, /* adrp x3, 0 */
- 0xf9400042, /* ldr x2, [x2, #0] */
- 0x91000063, /* add x3, x3, 0 */
- 0xd61f0040, /* br x2 */
- 0xd503201f, /* nop */
- 0xd503201f, /* nop */
- };
- template<int size, bool big_endian>
- void
- Output_data_plt_aarch64_standard<size, big_endian>::do_fill_tlsdesc_entry(
- unsigned char* pov,
- Address gotplt_address,
- Address plt_address,
- Address got_base,
- unsigned int tlsdesc_got_offset,
- unsigned int plt_offset)
- {
- memcpy(pov, tlsdesc_plt_entry, plt_tlsdesc_entry_size);
- // move DT_TLSDESC_GOT address into x2
- // move .got.plt address into x3
- Address tlsdesc_got_entry = got_base + tlsdesc_got_offset;
- Address plt_entry_address = plt_address + plt_offset;
- // R_AARCH64_ADR_PREL_PG_HI21
- AArch64_relocate_functions<size, big_endian>::adrp(
- pov + 4,
- tlsdesc_got_entry,
- plt_entry_address + 4);
- // R_AARCH64_ADR_PREL_PG_HI21
- AArch64_relocate_functions<size, big_endian>::adrp(
- pov + 8,
- gotplt_address,
- plt_entry_address + 8);
- // R_AARCH64_LDST64_ABS_LO12
- elfcpp::Swap<32, big_endian>::writeval(
- pov + 12,
- ((this->tlsdesc_plt_entry[3] & 0xffc003ff)
- | ((tlsdesc_got_entry & 0xff8) << 7)));
- // R_AARCH64_ADD_ABS_LO12
- elfcpp::Swap<32, big_endian>::writeval(
- pov + 16,
- ((this->tlsdesc_plt_entry[4] & 0xffc003ff)
- | ((gotplt_address & 0xfff) << 10)));
- }
- // Write out the PLT. This uses the hand-coded instructions above,
- // and adjusts them as needed. This is specified by the AMD64 ABI.
- template<int size, bool big_endian>
- void
- Output_data_plt_aarch64<size, big_endian>::do_write(Output_file* of)
- {
- const off_t offset = this->offset();
- const section_size_type oview_size =
- convert_to_section_size_type(this->data_size());
- unsigned char* const oview = of->get_output_view(offset, oview_size);
- const off_t got_file_offset = this->got_plt_->offset();
- gold_assert(got_file_offset + this->got_plt_->data_size()
- == this->got_irelative_->offset());
- const section_size_type got_size =
- convert_to_section_size_type(this->got_plt_->data_size()
- + this->got_irelative_->data_size());
- unsigned char* const got_view = of->get_output_view(got_file_offset,
- got_size);
- unsigned char* pov = oview;
- // The base address of the .plt section.
- typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
- // The base address of the PLT portion of the .got section.
- typename elfcpp::Elf_types<size>::Elf_Addr gotplt_address
- = this->got_plt_->address();
- this->fill_first_plt_entry(pov, gotplt_address, plt_address);
- pov += this->first_plt_entry_offset();
- // The first three entries in .got.plt are reserved.
- unsigned char* got_pov = got_view;
- memset(got_pov, 0, size / 8 * AARCH64_GOTPLT_RESERVE_COUNT);
- got_pov += (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT;
- unsigned int plt_offset = this->first_plt_entry_offset();
- unsigned int got_offset = (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT;
- const unsigned int count = this->count_ + this->irelative_count_;
- for (unsigned int plt_index = 0;
- plt_index < count;
- ++plt_index,
- pov += this->get_plt_entry_size(),
- got_pov += size / 8,
- plt_offset += this->get_plt_entry_size(),
- got_offset += size / 8)
- {
- // Set and adjust the PLT entry itself.
- this->fill_plt_entry(pov, gotplt_address, plt_address,
- got_offset, plt_offset);
- // Set the entry in the GOT, which points to plt0.
- elfcpp::Swap<size, big_endian>::writeval(got_pov, plt_address);
- }
- if (this->has_tlsdesc_entry())
- {
- // Set and adjust the reserved TLSDESC PLT entry.
- unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
- // The base address of the .base section.
- typename elfcpp::Elf_types<size>::Elf_Addr got_base =
- this->got_->address();
- this->fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base,
- tlsdesc_got_offset, plt_offset);
- pov += this->get_plt_tlsdesc_entry_size();
- }
- gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
- gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
- of->write_output_view(offset, oview_size, oview);
- of->write_output_view(got_file_offset, got_size, got_view);
- }
- // Telling how to update the immediate field of an instruction.
- struct AArch64_howto
- {
- // The immediate field mask.
- elfcpp::Elf_Xword dst_mask;
- // The offset to apply relocation immediate
- int doffset;
- // The second part offset, if the immediate field has two parts.
- // -1 if the immediate field has only one part.
- int doffset2;
- };
- static const AArch64_howto aarch64_howto[AArch64_reloc_property::INST_NUM] =
- {
- {0, -1, -1}, // DATA
- {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16
- {0xffffe0, 5, -1}, // LD [23:5]-imm19
- {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi
- {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi
- {0x3ffc00, 10, -1}, // ADD [21:10]-imm12
- {0x3ffc00, 10, -1}, // LDST [21:10]-imm12
- {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14
- {0xffffe0, 5, -1}, // CONDB [23:5]-imm19
- {0x3ffffff, 0, -1}, // B [25:0]-imm26
- {0x3ffffff, 0, -1}, // CALL [25:0]-imm26
- };
- // AArch64 relocate function class
- template<int size, bool big_endian>
- class AArch64_relocate_functions
- {
- public:
- typedef enum
- {
- STATUS_OKAY, // No error during relocation.
- STATUS_OVERFLOW, // Relocation overflow.
- STATUS_BAD_RELOC, // Relocation cannot be applied.
- } Status;
- typedef AArch64_relocate_functions<size, big_endian> This;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
- typedef Relocate_info<size, big_endian> The_relocate_info;
- typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
- typedef Reloc_stub<size, big_endian> The_reloc_stub;
- typedef Stub_table<size, big_endian> The_stub_table;
- typedef elfcpp::Rela<size, big_endian> The_rela;
- typedef typename elfcpp::Swap<size, big_endian>::Valtype AArch64_valtype;
- // Return the page address of the address.
- // Page(address) = address & ~0xFFF
- static inline AArch64_valtype
- Page(Address address)
- {
- return (address & (~static_cast<Address>(0xFFF)));
- }
- private:
- // Update instruction (pointed by view) with selected bits (immed).
- // val = (val & ~dst_mask) | (immed << doffset)
- template<int valsize>
- static inline void
- update_view(unsigned char* view,
- AArch64_valtype immed,
- elfcpp::Elf_Xword doffset,
- elfcpp::Elf_Xword dst_mask)
- {
- typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
- Valtype* wv = reinterpret_cast<Valtype*>(view);
- Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
- // Clear immediate fields.
- val &= ~dst_mask;
- elfcpp::Swap<valsize, big_endian>::writeval(wv,
- static_cast<Valtype>(val | (immed << doffset)));
- }
- // Update two parts of an instruction (pointed by view) with selected
- // bits (immed1 and immed2).
- // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
- template<int valsize>
- static inline void
- update_view_two_parts(
- unsigned char* view,
- AArch64_valtype immed1,
- AArch64_valtype immed2,
- elfcpp::Elf_Xword doffset1,
- elfcpp::Elf_Xword doffset2,
- elfcpp::Elf_Xword dst_mask)
- {
- typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
- Valtype* wv = reinterpret_cast<Valtype*>(view);
- Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
- val &= ~dst_mask;
- elfcpp::Swap<valsize, big_endian>::writeval(wv,
- static_cast<Valtype>(val | (immed1 << doffset1) |
- (immed2 << doffset2)));
- }
- // Update adr or adrp instruction with immed.
- // In adr and adrp: [30:29] immlo [23:5] immhi
- static inline void
- update_adr(unsigned char* view, AArch64_valtype immed)
- {
- elfcpp::Elf_Xword dst_mask = (0x3 << 29) | (0x7ffff << 5);
- This::template update_view_two_parts<32>(
- view,
- immed & 0x3,
- (immed & 0x1ffffc) >> 2,
- 29,
- 5,
- dst_mask);
- }
- // Update movz/movn instruction with bits immed.
- // Set instruction to movz if is_movz is true, otherwise set instruction
- // to movn.
- static inline void
- update_movnz(unsigned char* view,
- AArch64_valtype immed,
- bool is_movz)
- {
- typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
- Valtype* wv = reinterpret_cast<Valtype*>(view);
- Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
- const elfcpp::Elf_Xword doffset =
- aarch64_howto[AArch64_reloc_property::INST_MOVW].doffset;
- const elfcpp::Elf_Xword dst_mask =
- aarch64_howto[AArch64_reloc_property::INST_MOVW].dst_mask;
- // Clear immediate fields and opc code.
- val &= ~(dst_mask | (0x3 << 29));
- // Set instruction to movz or movn.
- // movz: [30:29] is 10 movn: [30:29] is 00
- if (is_movz)
- val |= (0x2 << 29);
- elfcpp::Swap<32, big_endian>::writeval(wv,
- static_cast<Valtype>(val | (immed << doffset)));
- }
- public:
- // Update selected bits in text.
- template<int valsize>
- static inline typename This::Status
- reloc_common(unsigned char* view, Address x,
- const AArch64_reloc_property* reloc_property)
- {
- // Select bits from X.
- Address immed = reloc_property->select_x_value(x);
- // Update view.
- const AArch64_reloc_property::Reloc_inst inst =
- reloc_property->reloc_inst();
- // If it is a data relocation or instruction has 2 parts of immediate
- // fields, you should not call pcrela_general.
- gold_assert(aarch64_howto[inst].doffset2 == -1 &&
- aarch64_howto[inst].doffset != -1);
- This::template update_view<valsize>(view, immed,
- aarch64_howto[inst].doffset,
- aarch64_howto[inst].dst_mask);
- // Do check overflow or alignment if needed.
- return (reloc_property->checkup_x_value(x)
- ? This::STATUS_OKAY
- : This::STATUS_OVERFLOW);
- }
- // Construct a B insn. Note, although we group it here with other relocation
- // operation, there is actually no 'relocation' involved here.
- static inline void
- construct_b(unsigned char* view, unsigned int branch_offset)
- {
- update_view_two_parts<32>(view, 0x05, (branch_offset >> 2),
- 26, 0, 0xffffffff);
- }
- // Do a simple rela relocation at unaligned addresses.
- template<int valsize>
- static inline typename This::Status
- rela_ua(unsigned char* view,
- const Sized_relobj_file<size, big_endian>* object,
- const Symbol_value<size>* psymval,
- AArch64_valtype addend,
- const AArch64_reloc_property* reloc_property)
- {
- typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
- Valtype;
- typename elfcpp::Elf_types<size>::Elf_Addr x =
- psymval->value(object, addend);
- elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view,
- static_cast<Valtype>(x));
- return (reloc_property->checkup_x_value(x)
- ? This::STATUS_OKAY
- : This::STATUS_OVERFLOW);
- }
- // Do a simple pc-relative relocation at unaligned addresses.
- template<int valsize>
- static inline typename This::Status
- pcrela_ua(unsigned char* view,
- const Sized_relobj_file<size, big_endian>* object,
- const Symbol_value<size>* psymval,
- AArch64_valtype addend,
- Address address,
- const AArch64_reloc_property* reloc_property)
- {
- typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
- Valtype;
- Address x = psymval->value(object, addend) - address;
- elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view,
- static_cast<Valtype>(x));
- return (reloc_property->checkup_x_value(x)
- ? This::STATUS_OKAY
- : This::STATUS_OVERFLOW);
- }
- // Do a simple rela relocation at aligned addresses.
- template<int valsize>
- static inline typename This::Status
- rela(
- unsigned char* view,
- const Sized_relobj_file<size, big_endian>* object,
- const Symbol_value<size>* psymval,
- AArch64_valtype addend,
- const AArch64_reloc_property* reloc_property)
- {
- typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
- Valtype* wv = reinterpret_cast<Valtype*>(view);
- Address x = psymval->value(object, addend);
- elfcpp::Swap<valsize, big_endian>::writeval(wv,static_cast<Valtype>(x));
- return (reloc_property->checkup_x_value(x)
- ? This::STATUS_OKAY
- : This::STATUS_OVERFLOW);
- }
- // Do relocate. Update selected bits in text.
- // new_val = (val & ~dst_mask) | (immed << doffset)
- template<int valsize>
- static inline typename This::Status
- rela_general(unsigned char* view,
- const Sized_relobj_file<size, big_endian>* object,
- const Symbol_value<size>* psymval,
- AArch64_valtype addend,
- const AArch64_reloc_property* reloc_property)
- {
- // Calculate relocation.
- Address x = psymval->value(object, addend);
- return This::template reloc_common<valsize>(view, x, reloc_property);
- }
- // Do relocate. Update selected bits in text.
- // new val = (val & ~dst_mask) | (immed << doffset)
- template<int valsize>
- static inline typename This::Status
- rela_general(
- unsigned char* view,
- AArch64_valtype s,
- AArch64_valtype addend,
- const AArch64_reloc_property* reloc_property)
- {
- // Calculate relocation.
- Address x = s + addend;
- return This::template reloc_common<valsize>(view, x, reloc_property);
- }
- // Do address relative relocate. Update selected bits in text.
- // new val = (val & ~dst_mask) | (immed << doffset)
- template<int valsize>
- static inline typename This::Status
- pcrela_general(
- unsigned char* view,
- const Sized_relobj_file<size, big_endian>* object,
- const Symbol_value<size>* psymval,
- AArch64_valtype addend,
- Address address,
- const AArch64_reloc_property* reloc_property)
- {
- // Calculate relocation.
- Address x = psymval->value(object, addend) - address;
- return This::template reloc_common<valsize>(view, x, reloc_property);
- }
- // Calculate (S + A) - address, update adr instruction.
- static inline typename This::Status
- adr(unsigned char* view,
- const Sized_relobj_file<size, big_endian>* object,
- const Symbol_value<size>* psymval,
- Address addend,
- Address address,
- const AArch64_reloc_property* /* reloc_property */)
- {
- AArch64_valtype x = psymval->value(object, addend) - address;
- // Pick bits [20:0] of X.
- AArch64_valtype immed = x & 0x1fffff;
- update_adr(view, immed);
- // Check -2^20 <= X < 2^20
- return (size == 64 && Bits<21>::has_overflow((x))
- ? This::STATUS_OVERFLOW
- : This::STATUS_OKAY);
- }
- // Calculate PG(S+A) - PG(address), update adrp instruction.
- // R_AARCH64_ADR_PREL_PG_HI21
- static inline typename This::Status
- adrp(
- unsigned char* view,
- Address sa,
- Address address)
- {
- AArch64_valtype x = This::Page(sa) - This::Page(address);
- // Pick [32:12] of X.
- AArch64_valtype immed = (x >> 12) & 0x1fffff;
- update_adr(view, immed);
- // Check -2^32 <= X < 2^32
- return (size == 64 && Bits<33>::has_overflow((x))
- ? This::STATUS_OVERFLOW
- : This::STATUS_OKAY);
- }
- // Calculate PG(S+A) - PG(address), update adrp instruction.
- // R_AARCH64_ADR_PREL_PG_HI21
- static inline typename This::Status
- adrp(unsigned char* view,
- const Sized_relobj_file<size, big_endian>* object,
- const Symbol_value<size>* psymval,
- Address addend,
- Address address,
- const AArch64_reloc_property* reloc_property)
- {
- Address sa = psymval->value(object, addend);
- AArch64_valtype x = This::Page(sa) - This::Page(address);
- // Pick [32:12] of X.
- AArch64_valtype immed = (x >> 12) & 0x1fffff;
- update_adr(view, immed);
- return (reloc_property->checkup_x_value(x)
- ? This::STATUS_OKAY
- : This::STATUS_OVERFLOW);
- }
- // Update mov[n/z] instruction. Check overflow if needed.
- // If X >=0, set the instruction to movz and its immediate value to the
- // selected bits S.
- // If X < 0, set the instruction to movn and its immediate value to
- // NOT (selected bits of).
- static inline typename This::Status
- movnz(unsigned char* view,
- AArch64_valtype x,
- const AArch64_reloc_property* reloc_property)
- {
- // Select bits from X.
- Address immed;
- bool is_movz;
- typedef typename elfcpp::Elf_types<size>::Elf_Swxword SignedW;
- if (static_cast<SignedW>(x) >= 0)
- {
- immed = reloc_property->select_x_value(x);
- is_movz = true;
- }
- else
- {
- immed = reloc_property->select_x_value(~x);;
- is_movz = false;
- }
- // Update movnz instruction.
- update_movnz(view, immed, is_movz);
- // Do check overflow or alignment if needed.
- return (reloc_property->checkup_x_value(x)
- ? This::STATUS_OKAY
- : This::STATUS_OVERFLOW);
- }
- static inline bool
- maybe_apply_stub(unsigned int,
- const The_relocate_info*,
- const The_rela&,
- unsigned char*,
- Address,
- const Sized_symbol<size>*,
- const Symbol_value<size>*,
- const Sized_relobj_file<size, big_endian>*,
- section_size_type);
- }; // End of AArch64_relocate_functions
- // For a certain relocation type (usually jump/branch), test to see if the
- // destination needs a stub to fulfil. If so, re-route the destination of the
- // original instruction to the stub, note, at this time, the stub has already
- // been generated.
- template<int size, bool big_endian>
- bool
- AArch64_relocate_functions<size, big_endian>::
- maybe_apply_stub(unsigned int r_type,
- const The_relocate_info* relinfo,
- const The_rela& rela,
- unsigned char* view,
- Address address,
- const Sized_symbol<size>* gsym,
- const Symbol_value<size>* psymval,
- const Sized_relobj_file<size, big_endian>* object,
- section_size_type current_group_size)
- {
- if (parameters->options().relocatable())
- return false;
- typename elfcpp::Elf_types<size>::Elf_Swxword addend = rela.get_r_addend();
- Address branch_target = psymval->value(object, 0) + addend;
- int stub_type =
- The_reloc_stub::stub_type_for_reloc(r_type, address, branch_target);
- if (stub_type == ST_NONE)
- return false;
- const The_aarch64_relobj* aarch64_relobj =
- static_cast<const The_aarch64_relobj*>(object);
- const AArch64_reloc_property* arp =
- aarch64_reloc_property_table->get_reloc_property(r_type);
- gold_assert(arp != NULL);
- // We don't create stubs for undefined symbols, but do for weak.
- if (gsym
- && !gsym->use_plt_offset(arp->reference_flags())
- && gsym->is_undefined())
- {
- gold_debug(DEBUG_TARGET,
- "stub: looking for a stub for undefined symbol %s in file %s",
- gsym->name(), aarch64_relobj->name().c_str());
- return false;
- }
- The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx);
- gold_assert(stub_table != NULL);
- unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
- typename The_reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend);
- The_reloc_stub* stub = stub_table->find_reloc_stub(stub_key);
- gold_assert(stub != NULL);
- Address new_branch_target = stub_table->address() + stub->offset();
- typename elfcpp::Swap<size, big_endian>::Valtype branch_offset =
- new_branch_target - address;
- typename This::Status status = This::template
- rela_general<32>(view, branch_offset, 0, arp);
- if (status != This::STATUS_OKAY)
- gold_error(_("Stub is too far away, try a smaller value "
- "for '--stub-group-size'. The current value is 0x%lx."),
- static_cast<unsigned long>(current_group_size));
- return true;
- }
- // Group input sections for stub generation.
- //
- // We group input sections in an output section so that the total size,
- // including any padding space due to alignment is smaller than GROUP_SIZE
- // unless the only input section in group is bigger than GROUP_SIZE already.
- // Then an ARM stub table is created to follow the last input section
- // in group. For each group an ARM stub table is created an is placed
- // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
- // extend the group after the stub table.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::group_sections(
- Layout* layout,
- section_size_type group_size,
- bool stubs_always_after_branch,
- const Task* task)
- {
- // Group input sections and insert stub table
- Layout::Section_list section_list;
- layout->get_executable_sections(§ion_list);
- for (Layout::Section_list::const_iterator p = section_list.begin();
- p != section_list.end();
- ++p)
- {
- AArch64_output_section<size, big_endian>* output_section =
- static_cast<AArch64_output_section<size, big_endian>*>(*p);
- output_section->group_sections(group_size, stubs_always_after_branch,
- this, task);
- }
- }
- // Find the AArch64_input_section object corresponding to the SHNDX-th input
- // section of RELOBJ.
- template<int size, bool big_endian>
- AArch64_input_section<size, big_endian>*
- Target_aarch64<size, big_endian>::find_aarch64_input_section(
- Relobj* relobj, unsigned int shndx) const
- {
- Section_id sid(relobj, shndx);
- typename AArch64_input_section_map::const_iterator p =
- this->aarch64_input_section_map_.find(sid);
- return (p != this->aarch64_input_section_map_.end()) ? p->second : NULL;
- }
- // Make a new AArch64_input_section object.
- template<int size, bool big_endian>
- AArch64_input_section<size, big_endian>*
- Target_aarch64<size, big_endian>::new_aarch64_input_section(
- Relobj* relobj, unsigned int shndx)
- {
- Section_id sid(relobj, shndx);
- AArch64_input_section<size, big_endian>* input_section =
- new AArch64_input_section<size, big_endian>(relobj, shndx);
- input_section->init();
- // Register new AArch64_input_section in map for look-up.
- std::pair<typename AArch64_input_section_map::iterator,bool> ins =
- this->aarch64_input_section_map_.insert(
- std::make_pair(sid, input_section));
- // Make sure that it we have not created another AArch64_input_section
- // for this input section already.
- gold_assert(ins.second);
- return input_section;
- }
- // Relaxation hook. This is where we do stub generation.
- template<int size, bool big_endian>
- bool
- Target_aarch64<size, big_endian>::do_relax(
- int pass,
- const Input_objects* input_objects,
- Symbol_table* symtab,
- Layout* layout ,
- const Task* task)
- {
- gold_assert(!parameters->options().relocatable());
- if (pass == 1)
- {
- // We don't handle negative stub_group_size right now.
- this->stub_group_size_ = abs(parameters->options().stub_group_size());
- if (this->stub_group_size_ == 1)
- {
- // Leave room for 4096 4-byte stub entries. If we exceed that, then we
- // will fail to link. The user will have to relink with an explicit
- // group size option.
- this->stub_group_size_ = The_reloc_stub::MAX_BRANCH_OFFSET -
- 4096 * 4;
- }
- group_sections(layout, this->stub_group_size_, true, task);
- }
- else
- {
- // If this is not the first pass, addresses and file offsets have
- // been reset at this point, set them here.
- for (Stub_table_iterator sp = this->stub_tables_.begin();
- sp != this->stub_tables_.end(); ++sp)
- {
- The_stub_table* stt = *sp;
- The_aarch64_input_section* owner = stt->owner();
- off_t off = align_address(owner->original_size(),
- stt->addralign());
- stt->set_address_and_file_offset(owner->address() + off,
- owner->offset() + off);
- }
- }
- // Scan relocs for relocation stubs
- for (Input_objects::Relobj_iterator op = input_objects->relobj_begin();
- op != input_objects->relobj_end();
- ++op)
- {
- The_aarch64_relobj* aarch64_relobj =
- static_cast<The_aarch64_relobj*>(*op);
- // Lock the object so we can read from it. This is only called
- // single-threaded from Layout::finalize, so it is OK to lock.
- Task_lock_obj<Object> tl(task, aarch64_relobj);
- aarch64_relobj->scan_sections_for_stubs(this, symtab, layout);
- }
- bool any_stub_table_changed = false;
- for (Stub_table_iterator siter = this->stub_tables_.begin();
- siter != this->stub_tables_.end() && !any_stub_table_changed; ++siter)
- {
- The_stub_table* stub_table = *siter;
- if (stub_table->update_data_size_changed_p())
- {
- The_aarch64_input_section* owner = stub_table->owner();
- uint64_t address = owner->address();
- off_t offset = owner->offset();
- owner->reset_address_and_file_offset();
- owner->set_address_and_file_offset(address, offset);
- any_stub_table_changed = true;
- }
- }
- // Do not continue relaxation.
- bool continue_relaxation = any_stub_table_changed;
- if (!continue_relaxation)
- for (Stub_table_iterator sp = this->stub_tables_.begin();
- (sp != this->stub_tables_.end());
- ++sp)
- (*sp)->finalize_stubs();
- return continue_relaxation;
- }
- // Make a new Stub_table.
- template<int size, bool big_endian>
- Stub_table<size, big_endian>*
- Target_aarch64<size, big_endian>::new_stub_table(
- AArch64_input_section<size, big_endian>* owner)
- {
- Stub_table<size, big_endian>* stub_table =
- new Stub_table<size, big_endian>(owner);
- stub_table->set_address(align_address(
- owner->address() + owner->data_size(), 8));
- stub_table->set_file_offset(owner->offset() + owner->data_size());
- stub_table->finalize_data_size();
- this->stub_tables_.push_back(stub_table);
- return stub_table;
- }
- template<int size, bool big_endian>
- uint64_t
- Target_aarch64<size, big_endian>::do_reloc_addend(
- void* arg, unsigned int r_type, uint64_t) const
- {
- gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC);
- uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
- gold_assert(intarg < this->tlsdesc_reloc_info_.size());
- const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
- const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
- gold_assert(psymval->is_tls_symbol());
- // The value of a TLS symbol is the offset in the TLS segment.
- return psymval->value(ti.object, 0);
- }
- // Return the number of entries in the PLT.
- template<int size, bool big_endian>
- unsigned int
- Target_aarch64<size, big_endian>::plt_entry_count() const
- {
- if (this->plt_ == NULL)
- return 0;
- return this->plt_->entry_count();
- }
- // Return the offset of the first non-reserved PLT entry.
- template<int size, bool big_endian>
- unsigned int
- Target_aarch64<size, big_endian>::first_plt_entry_offset() const
- {
- return this->plt_->first_plt_entry_offset();
- }
- // Return the size of each PLT entry.
- template<int size, bool big_endian>
- unsigned int
- Target_aarch64<size, big_endian>::plt_entry_size() const
- {
- return this->plt_->get_plt_entry_size();
- }
- // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::define_tls_base_symbol(
- Symbol_table* symtab, Layout* layout)
- {
- if (this->tls_base_symbol_defined_)
- return;
- Output_segment* tls_segment = layout->tls_segment();
- if (tls_segment != NULL)
- {
- // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
- symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
- Symbol_table::PREDEFINED,
- tls_segment, 0, 0,
- elfcpp::STT_TLS,
- elfcpp::STB_LOCAL,
- elfcpp::STV_HIDDEN, 0,
- Symbol::SEGMENT_START,
- true);
- }
- this->tls_base_symbol_defined_ = true;
- }
- // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::reserve_tlsdesc_entries(
- Symbol_table* symtab, Layout* layout)
- {
- if (this->plt_ == NULL)
- this->make_plt_section(symtab, layout);
- if (!this->plt_->has_tlsdesc_entry())
- {
- // Allocate the TLSDESC_GOT entry.
- Output_data_got_aarch64<size, big_endian>* got =
- this->got_section(symtab, layout);
- unsigned int got_offset = got->add_constant(0);
- // Allocate the TLSDESC_PLT entry.
- this->plt_->reserve_tlsdesc_entry(got_offset);
- }
- }
- // Create a GOT entry for the TLS module index.
- template<int size, bool big_endian>
- unsigned int
- Target_aarch64<size, big_endian>::got_mod_index_entry(
- Symbol_table* symtab, Layout* layout,
- Sized_relobj_file<size, big_endian>* object)
- {
- if (this->got_mod_index_offset_ == -1U)
- {
- gold_assert(symtab != NULL && layout != NULL && object != NULL);
- Reloc_section* rela_dyn = this->rela_dyn_section(layout);
- Output_data_got_aarch64<size, big_endian>* got =
- this->got_section(symtab, layout);
- unsigned int got_offset = got->add_constant(0);
- rela_dyn->add_local(object, 0, elfcpp::R_AARCH64_TLS_DTPMOD64, got,
- got_offset, 0);
- got->add_constant(0);
- this->got_mod_index_offset_ = got_offset;
- }
- return this->got_mod_index_offset_;
- }
- // Optimize the TLS relocation type based on what we know about the
- // symbol. IS_FINAL is true if the final address of this symbol is
- // known at link time.
- template<int size, bool big_endian>
- tls::Tls_optimization
- Target_aarch64<size, big_endian>::optimize_tls_reloc(bool is_final,
- int r_type)
- {
- // If we are generating a shared library, then we can't do anything
- // in the linker
- if (parameters->options().shared())
- return tls::TLSOPT_NONE;
- switch (r_type)
- {
- case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
- case elfcpp::R_AARCH64_TLSDESC_LD_PREL19:
- case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21:
- case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
- case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
- case elfcpp::R_AARCH64_TLSDESC_OFF_G1:
- case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC:
- case elfcpp::R_AARCH64_TLSDESC_LDR:
- case elfcpp::R_AARCH64_TLSDESC_ADD:
- case elfcpp::R_AARCH64_TLSDESC_CALL:
- // These are General-Dynamic which permits fully general TLS
- // access. Since we know that we are generating an executable,
- // we can convert this to Initial-Exec. If we also know that
- // this is a local symbol, we can further switch to Local-Exec.
- if (is_final)
- return tls::TLSOPT_TO_LE;
- return tls::TLSOPT_TO_IE;
- case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
- // These are Local-Dynamic, which refer to local symbols in the
- // dynamic TLS block. Since we know that we generating an
- // executable, we can switch to Local-Exec.
- return tls::TLSOPT_TO_LE;
- case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1:
- case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
- case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19:
- // These are Initial-Exec relocs which get the thread offset
- // from the GOT. If we know that we are linking against the
- // local symbol, we can switch to Local-Exec, which links the
- // thread offset into the instruction.
- if (is_final)
- return tls::TLSOPT_TO_LE;
- return tls::TLSOPT_NONE;
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC:
- // When we already have Local-Exec, there is nothing further we
- // can do.
- return tls::TLSOPT_NONE;
- default:
- gold_unreachable();
- }
- }
- // Returns true if this relocation type could be that of a function pointer.
- template<int size, bool big_endian>
- inline bool
- Target_aarch64<size, big_endian>::Scan::possible_function_pointer_reloc(
- unsigned int r_type)
- {
- switch (r_type)
- {
- case elfcpp::R_AARCH64_ADR_PREL_PG_HI21:
- case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC:
- case elfcpp::R_AARCH64_ADD_ABS_LO12_NC:
- case elfcpp::R_AARCH64_ADR_GOT_PAGE:
- case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
- {
- return true;
- }
- }
- return false;
- }
- // For safe ICF, scan a relocation for a local symbol to check if it
- // corresponds to a function pointer being taken. In that case mark
- // the function whose pointer was taken as not foldable.
- template<int size, bool big_endian>
- inline bool
- Target_aarch64<size, big_endian>::Scan::local_reloc_may_be_function_pointer(
- Symbol_table* ,
- Layout* ,
- Target_aarch64<size, big_endian>* ,
- Sized_relobj_file<size, big_endian>* ,
- unsigned int ,
- Output_section* ,
- const elfcpp::Rela<size, big_endian>& ,
- unsigned int r_type,
- const elfcpp::Sym<size, big_endian>&)
- {
- // When building a shared library, do not fold any local symbols.
- return (parameters->options().shared()
- || possible_function_pointer_reloc(r_type));
- }
- // For safe ICF, scan a relocation for a global symbol to check if it
- // corresponds to a function pointer being taken. In that case mark
- // the function whose pointer was taken as not foldable.
- template<int size, bool big_endian>
- inline bool
- Target_aarch64<size, big_endian>::Scan::global_reloc_may_be_function_pointer(
- Symbol_table* ,
- Layout* ,
- Target_aarch64<size, big_endian>* ,
- Sized_relobj_file<size, big_endian>* ,
- unsigned int ,
- Output_section* ,
- const elfcpp::Rela<size, big_endian>& ,
- unsigned int r_type,
- Symbol* gsym)
- {
- // When building a shared library, do not fold symbols whose visibility
- // is hidden, internal or protected.
- return ((parameters->options().shared()
- && (gsym->visibility() == elfcpp::STV_INTERNAL
- || gsym->visibility() == elfcpp::STV_PROTECTED
- || gsym->visibility() == elfcpp::STV_HIDDEN))
- || possible_function_pointer_reloc(r_type));
- }
- // Report an unsupported relocation against a local symbol.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::Scan::unsupported_reloc_local(
- Sized_relobj_file<size, big_endian>* object,
- unsigned int r_type)
- {
- gold_error(_("%s: unsupported reloc %u against local symbol"),
- object->name().c_str(), r_type);
- }
- // We are about to emit a dynamic relocation of type R_TYPE. If the
- // dynamic linker does not support it, issue an error.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::Scan::check_non_pic(Relobj* object,
- unsigned int r_type)
- {
- gold_assert(r_type != elfcpp::R_AARCH64_NONE);
- switch (r_type)
- {
- // These are the relocation types supported by glibc for AARCH64.
- case elfcpp::R_AARCH64_NONE:
- case elfcpp::R_AARCH64_COPY:
- case elfcpp::R_AARCH64_GLOB_DAT:
- case elfcpp::R_AARCH64_JUMP_SLOT:
- case elfcpp::R_AARCH64_RELATIVE:
- case elfcpp::R_AARCH64_TLS_DTPREL64:
- case elfcpp::R_AARCH64_TLS_DTPMOD64:
- case elfcpp::R_AARCH64_TLS_TPREL64:
- case elfcpp::R_AARCH64_TLSDESC:
- case elfcpp::R_AARCH64_IRELATIVE:
- case elfcpp::R_AARCH64_ABS32:
- case elfcpp::R_AARCH64_ABS64:
- return;
- default:
- break;
- }
- // This prevents us from issuing more than one error per reloc
- // section. But we can still wind up issuing more than one
- // error per object file.
- if (this->issued_non_pic_error_)
- return;
- gold_assert(parameters->options().output_is_position_independent());
- object->error(_("requires unsupported dynamic reloc; "
- "recompile with -fPIC"));
- this->issued_non_pic_error_ = true;
- return;
- }
- // Return whether we need to make a PLT entry for a relocation of the
- // given type against a STT_GNU_IFUNC symbol.
- template<int size, bool big_endian>
- bool
- Target_aarch64<size, big_endian>::Scan::reloc_needs_plt_for_ifunc(
- Sized_relobj_file<size, big_endian>* object,
- unsigned int r_type)
- {
- const AArch64_reloc_property* arp =
- aarch64_reloc_property_table->get_reloc_property(r_type);
- gold_assert(arp != NULL);
- int flags = arp->reference_flags();
- if (flags & Symbol::TLS_REF)
- {
- gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
- object->name().c_str(), arp->name().c_str());
- return false;
- }
- return flags != 0;
- }
- // Scan a relocation for a local symbol.
- template<int size, bool big_endian>
- inline void
- Target_aarch64<size, big_endian>::Scan::local(
- Symbol_table* symtab,
- Layout* layout,
- Target_aarch64<size, big_endian>* target,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int data_shndx,
- Output_section* output_section,
- const elfcpp::Rela<size, big_endian>& rela,
- unsigned int r_type,
- const elfcpp::Sym<size, big_endian>& lsym,
- bool is_discarded)
- {
- if (is_discarded)
- return;
- typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
- Reloc_section;
- unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
- // A local STT_GNU_IFUNC symbol may require a PLT entry.
- bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
- if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
- target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
- switch (r_type)
- {
- case elfcpp::R_AARCH64_NONE:
- break;
- case elfcpp::R_AARCH64_ABS32:
- case elfcpp::R_AARCH64_ABS16:
- if (parameters->options().output_is_position_independent())
- {
- gold_error(_("%s: unsupported reloc %u in pos independent link."),
- object->name().c_str(), r_type);
- }
- break;
- case elfcpp::R_AARCH64_ABS64:
- // If building a shared library or pie, we need to mark this as a dynmic
- // reloction, so that the dynamic loader can relocate it.
- if (parameters->options().output_is_position_independent())
- {
- Reloc_section* rela_dyn = target->rela_dyn_section(layout);
- rela_dyn->add_local_relative(object, r_sym,
- elfcpp::R_AARCH64_RELATIVE,
- output_section,
- data_shndx,
- rela.get_r_offset(),
- rela.get_r_addend(),
- is_ifunc);
- }
- break;
- case elfcpp::R_AARCH64_PREL64:
- case elfcpp::R_AARCH64_PREL32:
- case elfcpp::R_AARCH64_PREL16:
- break;
- case elfcpp::R_AARCH64_ADR_GOT_PAGE:
- case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
- case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15:
- // The above relocations are used to access GOT entries.
- {
- Output_data_got_aarch64<size, big_endian>* got =
- target->got_section(symtab, layout);
- bool is_new = false;
- // This symbol requires a GOT entry.
- if (is_ifunc)
- is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
- else
- is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
- if (is_new && parameters->options().output_is_position_independent())
- target->rela_dyn_section(layout)->
- add_local_relative(object,
- r_sym,
- elfcpp::R_AARCH64_RELATIVE,
- got,
- object->local_got_offset(r_sym,
- GOT_TYPE_STANDARD),
- 0,
- false);
- }
- break;
- case elfcpp::R_AARCH64_MOVW_UABS_G0: // 263
- case elfcpp::R_AARCH64_MOVW_UABS_G0_NC: // 264
- case elfcpp::R_AARCH64_MOVW_UABS_G1: // 265
- case elfcpp::R_AARCH64_MOVW_UABS_G1_NC: // 266
- case elfcpp::R_AARCH64_MOVW_UABS_G2: // 267
- case elfcpp::R_AARCH64_MOVW_UABS_G2_NC: // 268
- case elfcpp::R_AARCH64_MOVW_UABS_G3: // 269
- case elfcpp::R_AARCH64_MOVW_SABS_G0: // 270
- case elfcpp::R_AARCH64_MOVW_SABS_G1: // 271
- case elfcpp::R_AARCH64_MOVW_SABS_G2: // 272
- if (parameters->options().output_is_position_independent())
- {
- gold_error(_("%s: unsupported reloc %u in pos independent link."),
- object->name().c_str(), r_type);
- }
- break;
- case elfcpp::R_AARCH64_LD_PREL_LO19: // 273
- case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274
- case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275
- case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276
- case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277
- case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278
- case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284
- case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285
- case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286
- case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299
- break;
- // Control flow, pc-relative. We don't need to do anything for a relative
- // addressing relocation against a local symbol if it does not reference
- // the GOT.
- case elfcpp::R_AARCH64_TSTBR14:
- case elfcpp::R_AARCH64_CONDBR19:
- case elfcpp::R_AARCH64_JUMP26:
- case elfcpp::R_AARCH64_CALL26:
- break;
- case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
- case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
- {
- tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
- optimize_tls_reloc(!parameters->options().shared(), r_type);
- if (tlsopt == tls::TLSOPT_TO_LE)
- break;
- layout->set_has_static_tls();
- // Create a GOT entry for the tp-relative offset.
- if (!parameters->doing_static_link())
- {
- Output_data_got_aarch64<size, big_endian>* got =
- target->got_section(symtab, layout);
- got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
- target->rela_dyn_section(layout),
- elfcpp::R_AARCH64_TLS_TPREL64);
- }
- else if (!object->local_has_got_offset(r_sym,
- GOT_TYPE_TLS_OFFSET))
- {
- Output_data_got_aarch64<size, big_endian>* got =
- target->got_section(symtab, layout);
- got->add_local(object, r_sym, GOT_TYPE_TLS_OFFSET);
- unsigned int got_offset =
- object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET);
- const elfcpp::Elf_Xword addend = rela.get_r_addend();
- gold_assert(addend == 0);
- got->add_static_reloc(got_offset, elfcpp::R_AARCH64_TLS_TPREL64,
- object, r_sym);
- }
- }
- break;
- case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
- {
- tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
- optimize_tls_reloc(!parameters->options().shared(), r_type);
- if (tlsopt == tls::TLSOPT_TO_LE)
- {
- layout->set_has_static_tls();
- break;
- }
- gold_assert(tlsopt == tls::TLSOPT_NONE);
- Output_data_got_aarch64<size, big_endian>* got =
- target->got_section(symtab, layout);
- got->add_local_pair_with_rel(object,r_sym, data_shndx,
- GOT_TYPE_TLS_PAIR,
- target->rela_dyn_section(layout),
- elfcpp::R_AARCH64_TLS_DTPMOD64);
- }
- break;
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC:
- {
- layout->set_has_static_tls();
- bool output_is_shared = parameters->options().shared();
- if (output_is_shared)
- gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
- object->name().c_str(), r_type);
- }
- break;
- case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
- {
- tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
- optimize_tls_reloc(!parameters->options().shared(), r_type);
- if (tlsopt == tls::TLSOPT_NONE)
- {
- // Create a GOT entry for the module index.
- target->got_mod_index_entry(symtab, layout, object);
- }
- else if (tlsopt != tls::TLSOPT_TO_LE)
- unsupported_reloc_local(object, r_type);
- }
- break;
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
- break;
- case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
- case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
- {
- tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
- optimize_tls_reloc(!parameters->options().shared(), r_type);
- target->define_tls_base_symbol(symtab, layout);
- if (tlsopt == tls::TLSOPT_NONE)
- {
- // Create reserved PLT and GOT entries for the resolver.
- target->reserve_tlsdesc_entries(symtab, layout);
- // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
- // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
- // entry needs to be in an area in .got.plt, not .got. Call
- // got_section to make sure the section has been created.
- target->got_section(symtab, layout);
- Output_data_got<size, big_endian>* got =
- target->got_tlsdesc_section();
- unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
- if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
- {
- unsigned int got_offset = got->add_constant(0);
- got->add_constant(0);
- object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
- got_offset);
- Reloc_section* rt = target->rela_tlsdesc_section(layout);
- // We store the arguments we need in a vector, and use
- // the index into the vector as the parameter to pass
- // to the target specific routines.
- uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
- void* arg = reinterpret_cast<void*>(intarg);
- rt->add_target_specific(elfcpp::R_AARCH64_TLSDESC, arg,
- got, got_offset, 0);
- }
- }
- else if (tlsopt != tls::TLSOPT_TO_LE)
- unsupported_reloc_local(object, r_type);
- }
- break;
- case elfcpp::R_AARCH64_TLSDESC_CALL:
- break;
- default:
- unsupported_reloc_local(object, r_type);
- }
- }
- // Report an unsupported relocation against a global symbol.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::Scan::unsupported_reloc_global(
- Sized_relobj_file<size, big_endian>* object,
- unsigned int r_type,
- Symbol* gsym)
- {
- gold_error(_("%s: unsupported reloc %u against global symbol %s"),
- object->name().c_str(), r_type, gsym->demangled_name().c_str());
- }
- template<int size, bool big_endian>
- inline void
- Target_aarch64<size, big_endian>::Scan::global(
- Symbol_table* symtab,
- Layout* layout,
- Target_aarch64<size, big_endian>* target,
- Sized_relobj_file<size, big_endian> * object,
- unsigned int data_shndx,
- Output_section* output_section,
- const elfcpp::Rela<size, big_endian>& rela,
- unsigned int r_type,
- Symbol* gsym)
- {
- // A STT_GNU_IFUNC symbol may require a PLT entry.
- if (gsym->type() == elfcpp::STT_GNU_IFUNC
- && this->reloc_needs_plt_for_ifunc(object, r_type))
- target->make_plt_entry(symtab, layout, gsym);
- typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
- Reloc_section;
- const AArch64_reloc_property* arp =
- aarch64_reloc_property_table->get_reloc_property(r_type);
- gold_assert(arp != NULL);
- switch (r_type)
- {
- case elfcpp::R_AARCH64_NONE:
- break;
- case elfcpp::R_AARCH64_ABS16:
- case elfcpp::R_AARCH64_ABS32:
- case elfcpp::R_AARCH64_ABS64:
- {
- // Make a PLT entry if necessary.
- if (gsym->needs_plt_entry())
- {
- target->make_plt_entry(symtab, layout, gsym);
- // Since this is not a PC-relative relocation, we may be
- // taking the address of a function. In that case we need to
- // set the entry in the dynamic symbol table to the address of
- // the PLT entry.
- if (gsym->is_from_dynobj() && !parameters->options().shared())
- gsym->set_needs_dynsym_value();
- }
- // Make a dynamic relocation if necessary.
- if (gsym->needs_dynamic_reloc(arp->reference_flags()))
- {
- if (!parameters->options().output_is_position_independent()
- && gsym->may_need_copy_reloc())
- {
- target->copy_reloc(symtab, layout, object,
- data_shndx, output_section, gsym, rela);
- }
- else if (r_type == elfcpp::R_AARCH64_ABS64
- && gsym->type() == elfcpp::STT_GNU_IFUNC
- && gsym->can_use_relative_reloc(false)
- && !gsym->is_from_dynobj()
- && !gsym->is_undefined()
- && !gsym->is_preemptible())
- {
- // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
- // symbol. This makes a function address in a PIE executable
- // match the address in a shared library that it links against.
- Reloc_section* rela_dyn =
- target->rela_irelative_section(layout);
- unsigned int r_type = elfcpp::R_AARCH64_IRELATIVE;
- rela_dyn->add_symbolless_global_addend(gsym, r_type,
- output_section, object,
- data_shndx,
- rela.get_r_offset(),
- rela.get_r_addend());
- }
- else if (r_type == elfcpp::R_AARCH64_ABS64
- && gsym->can_use_relative_reloc(false))
- {
- Reloc_section* rela_dyn = target->rela_dyn_section(layout);
- rela_dyn->add_global_relative(gsym,
- elfcpp::R_AARCH64_RELATIVE,
- output_section,
- object,
- data_shndx,
- rela.get_r_offset(),
- rela.get_r_addend(),
- false);
- }
- else
- {
- check_non_pic(object, r_type);
- Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>*
- rela_dyn = target->rela_dyn_section(layout);
- rela_dyn->add_global(
- gsym, r_type, output_section, object,
- data_shndx, rela.get_r_offset(),rela.get_r_addend());
- }
- }
- }
- break;
- case elfcpp::R_AARCH64_PREL16:
- case elfcpp::R_AARCH64_PREL32:
- case elfcpp::R_AARCH64_PREL64:
- // This is used to fill the GOT absolute address.
- if (gsym->needs_plt_entry())
- {
- target->make_plt_entry(symtab, layout, gsym);
- }
- break;
- case elfcpp::R_AARCH64_MOVW_UABS_G0: // 263
- case elfcpp::R_AARCH64_MOVW_UABS_G0_NC: // 264
- case elfcpp::R_AARCH64_MOVW_UABS_G1: // 265
- case elfcpp::R_AARCH64_MOVW_UABS_G1_NC: // 266
- case elfcpp::R_AARCH64_MOVW_UABS_G2: // 267
- case elfcpp::R_AARCH64_MOVW_UABS_G2_NC: // 268
- case elfcpp::R_AARCH64_MOVW_UABS_G3: // 269
- case elfcpp::R_AARCH64_MOVW_SABS_G0: // 270
- case elfcpp::R_AARCH64_MOVW_SABS_G1: // 271
- case elfcpp::R_AARCH64_MOVW_SABS_G2: // 272
- if (parameters->options().output_is_position_independent())
- {
- gold_error(_("%s: unsupported reloc %u in pos independent link."),
- object->name().c_str(), r_type);
- }
- // Make a PLT entry if necessary.
- if (gsym->needs_plt_entry())
- {
- target->make_plt_entry(symtab, layout, gsym);
- // Since this is not a PC-relative relocation, we may be
- // taking the address of a function. In that case we need to
- // set the entry in the dynamic symbol table to the address of
- // the PLT entry.
- if (gsym->is_from_dynobj() && !parameters->options().shared())
- gsym->set_needs_dynsym_value();
- }
- break;
- case elfcpp::R_AARCH64_LD_PREL_LO19: // 273
- case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274
- case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275
- case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276
- case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277
- case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278
- case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284
- case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285
- case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286
- case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299
- {
- if (gsym->needs_plt_entry())
- target->make_plt_entry(symtab, layout, gsym);
- // Make a dynamic relocation if necessary.
- if (gsym->needs_dynamic_reloc(arp->reference_flags()))
- {
- if (parameters->options().output_is_executable()
- && gsym->may_need_copy_reloc())
- {
- target->copy_reloc(symtab, layout, object,
- data_shndx, output_section, gsym, rela);
- }
- }
- break;
- }
- case elfcpp::R_AARCH64_ADR_GOT_PAGE:
- case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
- case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15:
- {
- // The above relocations are used to access GOT entries.
- // Note a GOT entry is an *address* to a symbol.
- // The symbol requires a GOT entry
- Output_data_got_aarch64<size, big_endian>* got =
- target->got_section(symtab, layout);
- if (gsym->final_value_is_known())
- {
- // For a STT_GNU_IFUNC symbol we want the PLT address.
- if (gsym->type() == elfcpp::STT_GNU_IFUNC)
- got->add_global_plt(gsym, GOT_TYPE_STANDARD);
- else
- got->add_global(gsym, GOT_TYPE_STANDARD);
- }
- else
- {
- // If this symbol is not fully resolved, we need to add a dynamic
- // relocation for it.
- Reloc_section* rela_dyn = target->rela_dyn_section(layout);
- // Use a GLOB_DAT rather than a RELATIVE reloc if:
- //
- // 1) The symbol may be defined in some other module.
- // 2) We are building a shared library and this is a protected
- // symbol; using GLOB_DAT means that the dynamic linker can use
- // the address of the PLT in the main executable when appropriate
- // so that function address comparisons work.
- // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
- // again so that function address comparisons work.
- if (gsym->is_from_dynobj()
- || gsym->is_undefined()
- || gsym->is_preemptible()
- || (gsym->visibility() == elfcpp::STV_PROTECTED
- && parameters->options().shared())
- || (gsym->type() == elfcpp::STT_GNU_IFUNC
- && parameters->options().output_is_position_independent()))
- got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
- rela_dyn, elfcpp::R_AARCH64_GLOB_DAT);
- else
- {
- // For a STT_GNU_IFUNC symbol we want to write the PLT
- // offset into the GOT, so that function pointer
- // comparisons work correctly.
- bool is_new;
- if (gsym->type() != elfcpp::STT_GNU_IFUNC)
- is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
- else
- {
- is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
- // Tell the dynamic linker to use the PLT address
- // when resolving relocations.
- if (gsym->is_from_dynobj()
- && !parameters->options().shared())
- gsym->set_needs_dynsym_value();
- }
- if (is_new)
- {
- rela_dyn->add_global_relative(
- gsym, elfcpp::R_AARCH64_RELATIVE,
- got,
- gsym->got_offset(GOT_TYPE_STANDARD),
- 0,
- false);
- }
- }
- }
- break;
- }
- case elfcpp::R_AARCH64_TSTBR14:
- case elfcpp::R_AARCH64_CONDBR19:
- case elfcpp::R_AARCH64_JUMP26:
- case elfcpp::R_AARCH64_CALL26:
- {
- if (gsym->final_value_is_known())
- break;
- if (gsym->is_defined() &&
- !gsym->is_from_dynobj() &&
- !gsym->is_preemptible())
- break;
- // Make plt entry for function call.
- target->make_plt_entry(symtab, layout, gsym);
- break;
- }
- case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // General dynamic
- {
- tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
- optimize_tls_reloc(gsym->final_value_is_known(), r_type);
- if (tlsopt == tls::TLSOPT_TO_LE)
- {
- layout->set_has_static_tls();
- break;
- }
- gold_assert(tlsopt == tls::TLSOPT_NONE);
- // General dynamic.
- Output_data_got_aarch64<size, big_endian>* got =
- target->got_section(symtab, layout);
- // Create 2 consecutive entries for module index and offset.
- got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
- target->rela_dyn_section(layout),
- elfcpp::R_AARCH64_TLS_DTPMOD64,
- elfcpp::R_AARCH64_TLS_DTPREL64);
- }
- break;
- case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local dynamic
- {
- tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
- optimize_tls_reloc(!parameters->options().shared(), r_type);
- if (tlsopt == tls::TLSOPT_NONE)
- {
- // Create a GOT entry for the module index.
- target->got_mod_index_entry(symtab, layout, object);
- }
- else if (tlsopt != tls::TLSOPT_TO_LE)
- unsupported_reloc_local(object, r_type);
- }
- break;
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local dynamic
- break;
- case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
- case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial executable
- {
- tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
- optimize_tls_reloc(gsym->final_value_is_known(), r_type);
- if (tlsopt == tls::TLSOPT_TO_LE)
- break;
- layout->set_has_static_tls();
- // Create a GOT entry for the tp-relative offset.
- Output_data_got_aarch64<size, big_endian>* got
- = target->got_section(symtab, layout);
- if (!parameters->doing_static_link())
- {
- got->add_global_with_rel(
- gsym, GOT_TYPE_TLS_OFFSET,
- target->rela_dyn_section(layout),
- elfcpp::R_AARCH64_TLS_TPREL64);
- }
- if (!gsym->has_got_offset(GOT_TYPE_TLS_OFFSET))
- {
- got->add_global(gsym, GOT_TYPE_TLS_OFFSET);
- unsigned int got_offset =
- gsym->got_offset(GOT_TYPE_TLS_OFFSET);
- const elfcpp::Elf_Xword addend = rela.get_r_addend();
- gold_assert(addend == 0);
- got->add_static_reloc(got_offset,
- elfcpp::R_AARCH64_TLS_TPREL64, gsym);
- }
- }
- break;
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC: // Local executable
- layout->set_has_static_tls();
- if (parameters->options().shared())
- gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
- object->name().c_str(), r_type);
- break;
- case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
- case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: // TLS descriptor
- {
- target->define_tls_base_symbol(symtab, layout);
- tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
- optimize_tls_reloc(gsym->final_value_is_known(), r_type);
- if (tlsopt == tls::TLSOPT_NONE)
- {
- // Create reserved PLT and GOT entries for the resolver.
- target->reserve_tlsdesc_entries(symtab, layout);
- // Create a double GOT entry with an R_AARCH64_TLSDESC
- // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
- // entry needs to be in an area in .got.plt, not .got. Call
- // got_section to make sure the section has been created.
- target->got_section(symtab, layout);
- Output_data_got<size, big_endian>* got =
- target->got_tlsdesc_section();
- Reloc_section* rt = target->rela_tlsdesc_section(layout);
- got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
- elfcpp::R_AARCH64_TLSDESC, 0);
- }
- else if (tlsopt == tls::TLSOPT_TO_IE)
- {
- // Create a GOT entry for the tp-relative offset.
- Output_data_got<size, big_endian>* got
- = target->got_section(symtab, layout);
- got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
- target->rela_dyn_section(layout),
- elfcpp::R_AARCH64_TLS_TPREL64);
- }
- else if (tlsopt != tls::TLSOPT_TO_LE)
- unsupported_reloc_global(object, r_type, gsym);
- }
- break;
- case elfcpp::R_AARCH64_TLSDESC_CALL:
- break;
- default:
- gold_error(_("%s: unsupported reloc type in global scan"),
- aarch64_reloc_property_table->
- reloc_name_in_error_message(r_type).c_str());
- }
- return;
- } // End of Scan::global
- // Create the PLT section.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::make_plt_section(
- Symbol_table* symtab, Layout* layout)
- {
- if (this->plt_ == NULL)
- {
- // Create the GOT section first.
- this->got_section(symtab, layout);
- this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
- this->got_irelative_);
- layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
- (elfcpp::SHF_ALLOC
- | elfcpp::SHF_EXECINSTR),
- this->plt_, ORDER_PLT, false);
- // Make the sh_info field of .rela.plt point to .plt.
- Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
- rela_plt_os->set_info_section(this->plt_->output_section());
- }
- }
- // Return the section for TLSDESC relocations.
- template<int size, bool big_endian>
- typename Target_aarch64<size, big_endian>::Reloc_section*
- Target_aarch64<size, big_endian>::rela_tlsdesc_section(Layout* layout) const
- {
- return this->plt_section()->rela_tlsdesc(layout);
- }
- // Create a PLT entry for a global symbol.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::make_plt_entry(
- Symbol_table* symtab,
- Layout* layout,
- Symbol* gsym)
- {
- if (gsym->has_plt_offset())
- return;
- if (this->plt_ == NULL)
- this->make_plt_section(symtab, layout);
- this->plt_->add_entry(symtab, layout, gsym);
- }
- // Make a PLT entry for a local STT_GNU_IFUNC symbol.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::make_local_ifunc_plt_entry(
- Symbol_table* symtab, Layout* layout,
- Sized_relobj_file<size, big_endian>* relobj,
- unsigned int local_sym_index)
- {
- if (relobj->local_has_plt_offset(local_sym_index))
- return;
- if (this->plt_ == NULL)
- this->make_plt_section(symtab, layout);
- unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
- relobj,
- local_sym_index);
- relobj->set_local_plt_offset(local_sym_index, plt_offset);
- }
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::gc_process_relocs(
- Symbol_table* symtab,
- Layout* layout,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int data_shndx,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- size_t local_symbol_count,
- const unsigned char* plocal_symbols)
- {
- typedef Target_aarch64<size, big_endian> Aarch64;
- typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
- Classify_reloc;
- if (sh_type == elfcpp::SHT_REL)
- {
- return;
- }
- gold::gc_process_relocs<size, big_endian, Aarch64, Scan, Classify_reloc>(
- symtab,
- layout,
- this,
- object,
- data_shndx,
- prelocs,
- reloc_count,
- output_section,
- needs_special_offset_handling,
- local_symbol_count,
- plocal_symbols);
- }
- // Scan relocations for a section.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::scan_relocs(
- Symbol_table* symtab,
- Layout* layout,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int data_shndx,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- size_t local_symbol_count,
- const unsigned char* plocal_symbols)
- {
- typedef Target_aarch64<size, big_endian> Aarch64;
- typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
- Classify_reloc;
- if (sh_type == elfcpp::SHT_REL)
- {
- gold_error(_("%s: unsupported REL reloc section"),
- object->name().c_str());
- return;
- }
- gold::scan_relocs<size, big_endian, Aarch64, Scan, Classify_reloc>(
- symtab,
- layout,
- this,
- object,
- data_shndx,
- prelocs,
- reloc_count,
- output_section,
- needs_special_offset_handling,
- local_symbol_count,
- plocal_symbols);
- }
- // Return the value to use for a dynamic which requires special
- // treatment. This is how we support equality comparisons of function
- // pointers across shared library boundaries, as described in the
- // processor specific ABI supplement.
- template<int size, bool big_endian>
- uint64_t
- Target_aarch64<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
- {
- gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
- return this->plt_address_for_global(gsym);
- }
- // Finalize the sections.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::do_finalize_sections(
- Layout* layout,
- const Input_objects*,
- Symbol_table* symtab)
- {
- const Reloc_section* rel_plt = (this->plt_ == NULL
- ? NULL
- : this->plt_->rela_plt());
- layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
- this->rela_dyn_, true, false);
- // Emit any relocs we saved in an attempt to avoid generating COPY
- // relocs.
- if (this->copy_relocs_.any_saved_relocs())
- this->copy_relocs_.emit(this->rela_dyn_section(layout));
- // Fill in some more dynamic tags.
- Output_data_dynamic* const odyn = layout->dynamic_data();
- if (odyn != NULL)
- {
- if (this->plt_ != NULL
- && this->plt_->output_section() != NULL
- && this->plt_ ->has_tlsdesc_entry())
- {
- unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
- unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
- this->got_->finalize_data_size();
- odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
- this->plt_, plt_offset);
- odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
- this->got_, got_offset);
- }
- }
- // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
- // the .got section.
- Symbol* sym = this->global_offset_table_;
- if (sym != NULL)
- {
- uint64_t data_size = this->got_->current_data_size();
- symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
- // If the .got section is more than 0x8000 bytes, we add
- // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
- // bit relocations have a greater chance of working.
- if (data_size >= 0x8000)
- symtab->get_sized_symbol<size>(sym)->set_value(
- symtab->get_sized_symbol<size>(sym)->value() + 0x8000);
- }
- if (parameters->doing_static_link()
- && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
- {
- // If linking statically, make sure that the __rela_iplt symbols
- // were defined if necessary, even if we didn't create a PLT.
- static const Define_symbol_in_segment syms[] =
- {
- {
- "__rela_iplt_start", // name
- elfcpp::PT_LOAD, // segment_type
- elfcpp::PF_W, // segment_flags_set
- elfcpp::PF(0), // segment_flags_clear
- 0, // value
- 0, // size
- elfcpp::STT_NOTYPE, // type
- elfcpp::STB_GLOBAL, // binding
- elfcpp::STV_HIDDEN, // visibility
- 0, // nonvis
- Symbol::SEGMENT_START, // offset_from_base
- true // only_if_ref
- },
- {
- "__rela_iplt_end", // name
- elfcpp::PT_LOAD, // segment_type
- elfcpp::PF_W, // segment_flags_set
- elfcpp::PF(0), // segment_flags_clear
- 0, // value
- 0, // size
- elfcpp::STT_NOTYPE, // type
- elfcpp::STB_GLOBAL, // binding
- elfcpp::STV_HIDDEN, // visibility
- 0, // nonvis
- Symbol::SEGMENT_START, // offset_from_base
- true // only_if_ref
- }
- };
- symtab->define_symbols(layout, 2, syms,
- layout->script_options()->saw_sections_clause());
- }
- return;
- }
- // Perform a relocation.
- template<int size, bool big_endian>
- inline bool
- Target_aarch64<size, big_endian>::Relocate::relocate(
- const Relocate_info<size, big_endian>* relinfo,
- unsigned int,
- Target_aarch64<size, big_endian>* target,
- Output_section* ,
- size_t relnum,
- const unsigned char* preloc,
- const Sized_symbol<size>* gsym,
- const Symbol_value<size>* psymval,
- unsigned char* view,
- typename elfcpp::Elf_types<size>::Elf_Addr address,
- section_size_type /* view_size */)
- {
- if (view == NULL)
- return true;
- typedef AArch64_relocate_functions<size, big_endian> Reloc;
- const elfcpp::Rela<size, big_endian> rela(preloc);
- unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info());
- const AArch64_reloc_property* reloc_property =
- aarch64_reloc_property_table->get_reloc_property(r_type);
- if (reloc_property == NULL)
- {
- std::string reloc_name =
- aarch64_reloc_property_table->reloc_name_in_error_message(r_type);
- gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
- _("cannot relocate %s in object file"),
- reloc_name.c_str());
- return true;
- }
- const Sized_relobj_file<size, big_endian>* object = relinfo->object;
- // Pick the value to use for symbols defined in the PLT.
- Symbol_value<size> symval;
- if (gsym != NULL
- && gsym->use_plt_offset(reloc_property->reference_flags()))
- {
- symval.set_output_value(target->plt_address_for_global(gsym));
- psymval = &symval;
- }
- else if (gsym == NULL && psymval->is_ifunc_symbol())
- {
- unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
- if (object->local_has_plt_offset(r_sym))
- {
- symval.set_output_value(target->plt_address_for_local(object, r_sym));
- psymval = &symval;
- }
- }
- const elfcpp::Elf_Xword addend = rela.get_r_addend();
- // Get the GOT offset if needed.
- // For aarch64, the GOT pointer points to the start of the GOT section.
- bool have_got_offset = false;
- int got_offset = 0;
- int got_base = (target->got_ != NULL
- ? (target->got_->current_data_size() >= 0x8000
- ? 0x8000 : 0)
- : 0);
- switch (r_type)
- {
- case elfcpp::R_AARCH64_MOVW_GOTOFF_G0:
- case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC:
- case elfcpp::R_AARCH64_MOVW_GOTOFF_G1:
- case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC:
- case elfcpp::R_AARCH64_MOVW_GOTOFF_G2:
- case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC:
- case elfcpp::R_AARCH64_MOVW_GOTOFF_G3:
- case elfcpp::R_AARCH64_GOTREL64:
- case elfcpp::R_AARCH64_GOTREL32:
- case elfcpp::R_AARCH64_GOT_LD_PREL19:
- case elfcpp::R_AARCH64_LD64_GOTOFF_LO15:
- case elfcpp::R_AARCH64_ADR_GOT_PAGE:
- case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
- case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15:
- if (gsym != NULL)
- {
- gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
- got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - got_base;
- }
- else
- {
- unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
- gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
- got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
- - got_base);
- }
- have_got_offset = true;
- break;
- default:
- break;
- }
- typename Reloc::Status reloc_status = Reloc::STATUS_OKAY;
- typename elfcpp::Elf_types<size>::Elf_Addr value;
- switch (r_type)
- {
- case elfcpp::R_AARCH64_NONE:
- break;
- case elfcpp::R_AARCH64_ABS64:
- if (!parameters->options().apply_dynamic_relocs()
- && parameters->options().output_is_position_independent()
- && gsym != NULL
- && gsym->needs_dynamic_reloc(reloc_property->reference_flags())
- && !gsym->can_use_relative_reloc(false))
- // We have generated an absolute dynamic relocation, so do not
- // apply the relocation statically. (Works around bugs in older
- // Android dynamic linkers.)
- break;
- reloc_status = Reloc::template rela_ua<64>(
- view, object, psymval, addend, reloc_property);
- break;
- case elfcpp::R_AARCH64_ABS32:
- if (!parameters->options().apply_dynamic_relocs()
- && parameters->options().output_is_position_independent()
- && gsym != NULL
- && gsym->needs_dynamic_reloc(reloc_property->reference_flags()))
- // We have generated an absolute dynamic relocation, so do not
- // apply the relocation statically. (Works around bugs in older
- // Android dynamic linkers.)
- break;
- reloc_status = Reloc::template rela_ua<32>(
- view, object, psymval, addend, reloc_property);
- break;
- case elfcpp::R_AARCH64_ABS16:
- if (!parameters->options().apply_dynamic_relocs()
- && parameters->options().output_is_position_independent()
- && gsym != NULL
- && gsym->needs_dynamic_reloc(reloc_property->reference_flags()))
- // We have generated an absolute dynamic relocation, so do not
- // apply the relocation statically. (Works around bugs in older
- // Android dynamic linkers.)
- break;
- reloc_status = Reloc::template rela_ua<16>(
- view, object, psymval, addend, reloc_property);
- break;
- case elfcpp::R_AARCH64_PREL64:
- reloc_status = Reloc::template pcrela_ua<64>(
- view, object, psymval, addend, address, reloc_property);
- break;
- case elfcpp::R_AARCH64_PREL32:
- reloc_status = Reloc::template pcrela_ua<32>(
- view, object, psymval, addend, address, reloc_property);
- break;
- case elfcpp::R_AARCH64_PREL16:
- reloc_status = Reloc::template pcrela_ua<16>(
- view, object, psymval, addend, address, reloc_property);
- break;
- case elfcpp::R_AARCH64_MOVW_UABS_G0:
- case elfcpp::R_AARCH64_MOVW_UABS_G0_NC:
- case elfcpp::R_AARCH64_MOVW_UABS_G1:
- case elfcpp::R_AARCH64_MOVW_UABS_G1_NC:
- case elfcpp::R_AARCH64_MOVW_UABS_G2:
- case elfcpp::R_AARCH64_MOVW_UABS_G2_NC:
- case elfcpp::R_AARCH64_MOVW_UABS_G3:
- reloc_status = Reloc::template rela_general<32>(
- view, object, psymval, addend, reloc_property);
- break;
- case elfcpp::R_AARCH64_MOVW_SABS_G0:
- case elfcpp::R_AARCH64_MOVW_SABS_G1:
- case elfcpp::R_AARCH64_MOVW_SABS_G2:
- reloc_status = Reloc::movnz(view, psymval->value(object, addend),
- reloc_property);
- break;
- case elfcpp::R_AARCH64_LD_PREL_LO19:
- reloc_status = Reloc::template pcrela_general<32>(
- view, object, psymval, addend, address, reloc_property);
- break;
- case elfcpp::R_AARCH64_ADR_PREL_LO21:
- reloc_status = Reloc::adr(view, object, psymval, addend,
- address, reloc_property);
- break;
- case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC:
- case elfcpp::R_AARCH64_ADR_PREL_PG_HI21:
- reloc_status = Reloc::adrp(view, object, psymval, addend, address,
- reloc_property);
- break;
- case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC:
- case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC:
- case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC:
- case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC:
- case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC:
- case elfcpp::R_AARCH64_ADD_ABS_LO12_NC:
- reloc_status = Reloc::template rela_general<32>(
- view, object, psymval, addend, reloc_property);
- break;
- case elfcpp::R_AARCH64_CALL26:
- if (this->skip_call_tls_get_addr_)
- {
- // Double check that the TLSGD insn has been optimized away.
- typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
- Insntype insn = elfcpp::Swap<32, big_endian>::readval(
- reinterpret_cast<Insntype*>(view));
- gold_assert((insn & 0xff000000) == 0x91000000);
- reloc_status = Reloc::STATUS_OKAY;
- this->skip_call_tls_get_addr_ = false;
- // Return false to stop further processing this reloc.
- return false;
- }
- // Fall through.
- case elfcpp::R_AARCH64_JUMP26:
- if (Reloc::maybe_apply_stub(r_type, relinfo, rela, view, address,
- gsym, psymval, object,
- target->stub_group_size_))
- break;
- // Fall through.
- case elfcpp::R_AARCH64_TSTBR14:
- case elfcpp::R_AARCH64_CONDBR19:
- reloc_status = Reloc::template pcrela_general<32>(
- view, object, psymval, addend, address, reloc_property);
- break;
- case elfcpp::R_AARCH64_ADR_GOT_PAGE:
- gold_assert(have_got_offset);
- value = target->got_->address() + got_base + got_offset;
- reloc_status = Reloc::adrp(view, value + addend, address);
- break;
- case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
- gold_assert(have_got_offset);
- value = target->got_->address() + got_base + got_offset;
- reloc_status = Reloc::template rela_general<32>(
- view, value, addend, reloc_property);
- break;
- case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15:
- {
- gold_assert(have_got_offset);
- value = target->got_->address() + got_base + got_offset + addend -
- Reloc::Page(target->got_->address() + got_base);
- if ((value & 7) != 0)
- reloc_status = Reloc::STATUS_OVERFLOW;
- else
- reloc_status = Reloc::template reloc_common<32>(
- view, value, reloc_property);
- break;
- }
- case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
- case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
- case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
- case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
- case elfcpp::R_AARCH64_TLSDESC_CALL:
- reloc_status = relocate_tls(relinfo, target, relnum, rela, r_type,
- gsym, psymval, view, address);
- break;
- // These are dynamic relocations, which are unexpected when linking.
- case elfcpp::R_AARCH64_COPY:
- case elfcpp::R_AARCH64_GLOB_DAT:
- case elfcpp::R_AARCH64_JUMP_SLOT:
- case elfcpp::R_AARCH64_RELATIVE:
- case elfcpp::R_AARCH64_IRELATIVE:
- case elfcpp::R_AARCH64_TLS_DTPREL64:
- case elfcpp::R_AARCH64_TLS_DTPMOD64:
- case elfcpp::R_AARCH64_TLS_TPREL64:
- case elfcpp::R_AARCH64_TLSDESC:
- gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
- _("unexpected reloc %u in object file"),
- r_type);
- break;
- default:
- gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
- _("unsupported reloc %s"),
- reloc_property->name().c_str());
- break;
- }
- // Report any errors.
- switch (reloc_status)
- {
- case Reloc::STATUS_OKAY:
- break;
- case Reloc::STATUS_OVERFLOW:
- gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
- _("relocation overflow in %s"),
- reloc_property->name().c_str());
- break;
- case Reloc::STATUS_BAD_RELOC:
- gold_error_at_location(
- relinfo,
- relnum,
- rela.get_r_offset(),
- _("unexpected opcode while processing relocation %s"),
- reloc_property->name().c_str());
- break;
- default:
- gold_unreachable();
- }
- return true;
- }
- template<int size, bool big_endian>
- inline
- typename AArch64_relocate_functions<size, big_endian>::Status
- Target_aarch64<size, big_endian>::Relocate::relocate_tls(
- const Relocate_info<size, big_endian>* relinfo,
- Target_aarch64<size, big_endian>* target,
- size_t relnum,
- const elfcpp::Rela<size, big_endian>& rela,
- unsigned int r_type, const Sized_symbol<size>* gsym,
- const Symbol_value<size>* psymval,
- unsigned char* view,
- typename elfcpp::Elf_types<size>::Elf_Addr address)
- {
- typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
- Output_segment* tls_segment = relinfo->layout->tls_segment();
- const elfcpp::Elf_Xword addend = rela.get_r_addend();
- const AArch64_reloc_property* reloc_property =
- aarch64_reloc_property_table->get_reloc_property(r_type);
- gold_assert(reloc_property != NULL);
- const bool is_final = (gsym == NULL
- ? !parameters->options().shared()
- : gsym->final_value_is_known());
- tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
- optimize_tls_reloc(is_final, r_type);
- Sized_relobj_file<size, big_endian>* object = relinfo->object;
- int tls_got_offset_type;
- switch (r_type)
- {
- case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // Global-dynamic
- {
- if (tlsopt == tls::TLSOPT_TO_LE)
- {
- if (tls_segment == NULL)
- {
- gold_assert(parameters->errors()->error_count() > 0
- || issue_undefined_symbol_error(gsym));
- return aarch64_reloc_funcs::STATUS_BAD_RELOC;
- }
- return tls_gd_to_le(relinfo, target, rela, r_type, view,
- psymval);
- }
- else if (tlsopt == tls::TLSOPT_NONE)
- {
- tls_got_offset_type = GOT_TYPE_TLS_PAIR;
- // Firstly get the address for the got entry.
- typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
- if (gsym != NULL)
- {
- gold_assert(gsym->has_got_offset(tls_got_offset_type));
- got_entry_address = target->got_->address() +
- gsym->got_offset(tls_got_offset_type);
- }
- else
- {
- unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
- gold_assert(
- object->local_has_got_offset(r_sym, tls_got_offset_type));
- got_entry_address = target->got_->address() +
- object->local_got_offset(r_sym, tls_got_offset_type);
- }
- // Relocate the address into adrp/ld, adrp/add pair.
- switch (r_type)
- {
- case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
- return aarch64_reloc_funcs::adrp(
- view, got_entry_address + addend, address);
- break;
- case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
- return aarch64_reloc_funcs::template rela_general<32>(
- view, got_entry_address, addend, reloc_property);
- break;
- default:
- gold_unreachable();
- }
- }
- gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
- _("unsupported gd_to_ie relaxation on %u"),
- r_type);
- }
- break;
- case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local-dynamic
- {
- if (tlsopt == tls::TLSOPT_TO_LE)
- {
- if (tls_segment == NULL)
- {
- gold_assert(parameters->errors()->error_count() > 0
- || issue_undefined_symbol_error(gsym));
- return aarch64_reloc_funcs::STATUS_BAD_RELOC;
- }
- return this->tls_ld_to_le(relinfo, target, rela, r_type, view,
- psymval);
- }
- gold_assert(tlsopt == tls::TLSOPT_NONE);
- // Relocate the field with the offset of the GOT entry for
- // the module index.
- typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
- got_entry_address = (target->got_mod_index_entry(NULL, NULL, NULL) +
- target->got_->address());
- switch (r_type)
- {
- case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
- return aarch64_reloc_funcs::adrp(
- view, got_entry_address + addend, address);
- break;
- case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
- return aarch64_reloc_funcs::template rela_general<32>(
- view, got_entry_address, addend, reloc_property);
- break;
- default:
- gold_unreachable();
- }
- }
- break;
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local-dynamic
- {
- AArch64_address value = psymval->value(object, 0);
- if (tlsopt == tls::TLSOPT_TO_LE)
- {
- if (tls_segment == NULL)
- {
- gold_assert(parameters->errors()->error_count() > 0
- || issue_undefined_symbol_error(gsym));
- return aarch64_reloc_funcs::STATUS_BAD_RELOC;
- }
- }
- switch (r_type)
- {
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
- return aarch64_reloc_funcs::movnz(view, value + addend,
- reloc_property);
- break;
- case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
- case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
- return aarch64_reloc_funcs::template rela_general<32>(
- view, value, addend, reloc_property);
- break;
- default:
- gold_unreachable();
- }
- // We should never reach here.
- }
- break;
- case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
- case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial-exec
- {
- if (tlsopt == tls::TLSOPT_TO_LE)
- {
- if (tls_segment == NULL)
- {
- gold_assert(parameters->errors()->error_count() > 0
- || issue_undefined_symbol_error(gsym));
- return aarch64_reloc_funcs::STATUS_BAD_RELOC;
- }
- return tls_ie_to_le(relinfo, target, rela, r_type, view,
- psymval);
- }
- tls_got_offset_type = GOT_TYPE_TLS_OFFSET;
- // Firstly get the address for the got entry.
- typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
- if (gsym != NULL)
- {
- gold_assert(gsym->has_got_offset(tls_got_offset_type));
- got_entry_address = target->got_->address() +
- gsym->got_offset(tls_got_offset_type);
- }
- else
- {
- unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
- gold_assert(
- object->local_has_got_offset(r_sym, tls_got_offset_type));
- got_entry_address = target->got_->address() +
- object->local_got_offset(r_sym, tls_got_offset_type);
- }
- // Relocate the address into adrp/ld, adrp/add pair.
- switch (r_type)
- {
- case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
- return aarch64_reloc_funcs::adrp(view, got_entry_address + addend,
- address);
- break;
- case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
- return aarch64_reloc_funcs::template rela_general<32>(
- view, got_entry_address, addend, reloc_property);
- default:
- gold_unreachable();
- }
- }
- // We shall never reach here.
- break;
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC:
- case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12:
- case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC:
- {
- gold_assert(tls_segment != NULL);
- AArch64_address value = psymval->value(object, 0);
- if (!parameters->options().shared())
- {
- AArch64_address aligned_tcb_size =
- align_address(target->tcb_size(),
- tls_segment->maximum_alignment());
- value += aligned_tcb_size;
- switch (r_type)
- {
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
- case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
- return aarch64_reloc_funcs::movnz(view, value + addend,
- reloc_property);
- default:
- return aarch64_reloc_funcs::template
- rela_general<32>(view,
- value,
- addend,
- reloc_property);
- }
- }
- else
- gold_error(_("%s: unsupported reloc %u "
- "in non-static TLSLE mode."),
- object->name().c_str(), r_type);
- }
- break;
- case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
- case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
- case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
- case elfcpp::R_AARCH64_TLSDESC_CALL:
- {
- if (tlsopt == tls::TLSOPT_TO_LE)
- {
- if (tls_segment == NULL)
- {
- gold_assert(parameters->errors()->error_count() > 0
- || issue_undefined_symbol_error(gsym));
- return aarch64_reloc_funcs::STATUS_BAD_RELOC;
- }
- return tls_desc_gd_to_le(relinfo, target, rela, r_type,
- view, psymval);
- }
- else
- {
- tls_got_offset_type = (tlsopt == tls::TLSOPT_TO_IE
- ? GOT_TYPE_TLS_OFFSET
- : GOT_TYPE_TLS_DESC);
- int got_tlsdesc_offset = 0;
- if (r_type != elfcpp::R_AARCH64_TLSDESC_CALL
- && tlsopt == tls::TLSOPT_NONE)
- {
- // We created GOT entries in the .got.tlsdesc portion of the
- // .got.plt section, but the offset stored in the symbol is the
- // offset within .got.tlsdesc.
- got_tlsdesc_offset = (target->got_tlsdesc_->address()
- - target->got_->address());
- }
- typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
- if (gsym != NULL)
- {
- gold_assert(gsym->has_got_offset(tls_got_offset_type));
- got_entry_address = target->got_->address()
- + got_tlsdesc_offset
- + gsym->got_offset(tls_got_offset_type);
- }
- else
- {
- unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
- gold_assert(
- object->local_has_got_offset(r_sym, tls_got_offset_type));
- got_entry_address = target->got_->address() +
- got_tlsdesc_offset +
- object->local_got_offset(r_sym, tls_got_offset_type);
- }
- if (tlsopt == tls::TLSOPT_TO_IE)
- {
- return tls_desc_gd_to_ie(relinfo, target, rela, r_type,
- view, psymval, got_entry_address,
- address);
- }
- // Now do tlsdesc relocation.
- switch (r_type)
- {
- case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
- return aarch64_reloc_funcs::adrp(view,
- got_entry_address + addend,
- address);
- break;
- case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
- case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
- return aarch64_reloc_funcs::template rela_general<32>(
- view, got_entry_address, addend, reloc_property);
- break;
- case elfcpp::R_AARCH64_TLSDESC_CALL:
- return aarch64_reloc_funcs::STATUS_OKAY;
- break;
- default:
- gold_unreachable();
- }
- }
- }
- break;
- default:
- gold_error(_("%s: unsupported TLS reloc %u."),
- object->name().c_str(), r_type);
- }
- return aarch64_reloc_funcs::STATUS_BAD_RELOC;
- } // End of relocate_tls.
- template<int size, bool big_endian>
- inline
- typename AArch64_relocate_functions<size, big_endian>::Status
- Target_aarch64<size, big_endian>::Relocate::tls_gd_to_le(
- const Relocate_info<size, big_endian>* relinfo,
- Target_aarch64<size, big_endian>* target,
- const elfcpp::Rela<size, big_endian>& rela,
- unsigned int r_type,
- unsigned char* view,
- const Symbol_value<size>* psymval)
- {
- typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
- typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
- Insntype* ip = reinterpret_cast<Insntype*>(view);
- Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip);
- Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1);
- Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2);
- if (r_type == elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC)
- {
- // This is the 2nd relocs, optimization should already have been
- // done.
- gold_assert((insn1 & 0xfff00000) == 0x91400000);
- return aarch64_reloc_funcs::STATUS_OKAY;
- }
- // The original sequence is -
- // 90000000 adrp x0, 0 <main>
- // 91000000 add x0, x0, #0x0
- // 94000000 bl 0 <__tls_get_addr>
- // optimized to sequence -
- // d53bd040 mrs x0, tpidr_el0
- // 91400000 add x0, x0, #0x0, lsl #12
- // 91000000 add x0, x0, #0x0
- // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
- // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
- // have to change "bl tls_get_addr", which does not have a corresponding tls
- // relocation type. So before proceeding, we need to make sure compiler
- // does not change the sequence.
- if(!(insn1 == 0x90000000 // adrp x0,0
- && insn2 == 0x91000000 // add x0, x0, #0x0
- && insn3 == 0x94000000)) // bl 0
- {
- // Ideally we should give up gd_to_le relaxation and do gd access.
- // However the gd_to_le relaxation decision has been made early
- // in the scan stage, where we did not allocate any GOT entry for
- // this symbol. Therefore we have to exit and report error now.
- gold_error(_("unexpected reloc insn sequence while relaxing "
- "tls gd to le for reloc %u."), r_type);
- return aarch64_reloc_funcs::STATUS_BAD_RELOC;
- }
- // Write new insns.
- insn1 = 0xd53bd040; // mrs x0, tpidr_el0
- insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12
- insn3 = 0x91000000; // add x0, x0, #0x0
- elfcpp::Swap<32, big_endian>::writeval(ip, insn1);
- elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2);
- elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3);
- // Calculate tprel value.
- Output_segment* tls_segment = relinfo->layout->tls_segment();
- gold_assert(tls_segment != NULL);
- AArch64_address value = psymval->value(relinfo->object, 0);
- const elfcpp::Elf_Xword addend = rela.get_r_addend();
- AArch64_address aligned_tcb_size =
- align_address(target->tcb_size(), tls_segment->maximum_alignment());
- AArch64_address x = value + aligned_tcb_size;
- // After new insns are written, apply TLSLE relocs.
- const AArch64_reloc_property* rp1 =
- aarch64_reloc_property_table->get_reloc_property(
- elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12);
- const AArch64_reloc_property* rp2 =
- aarch64_reloc_property_table->get_reloc_property(
- elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12);
- gold_assert(rp1 != NULL && rp2 != NULL);
- typename aarch64_reloc_funcs::Status s1 =
- aarch64_reloc_funcs::template rela_general<32>(view + 4,
- x,
- addend,
- rp1);
- if (s1 != aarch64_reloc_funcs::STATUS_OKAY)
- return s1;
- typename aarch64_reloc_funcs::Status s2 =
- aarch64_reloc_funcs::template rela_general<32>(view + 8,
- x,
- addend,
- rp2);
- this->skip_call_tls_get_addr_ = true;
- return s2;
- } // End of tls_gd_to_le
- template<int size, bool big_endian>
- inline
- typename AArch64_relocate_functions<size, big_endian>::Status
- Target_aarch64<size, big_endian>::Relocate::tls_ld_to_le(
- const Relocate_info<size, big_endian>* relinfo,
- Target_aarch64<size, big_endian>* target,
- const elfcpp::Rela<size, big_endian>& rela,
- unsigned int r_type,
- unsigned char* view,
- const Symbol_value<size>* psymval)
- {
- typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
- typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
- Insntype* ip = reinterpret_cast<Insntype*>(view);
- Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip);
- Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1);
- Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2);
- if (r_type == elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC)
- {
- // This is the 2nd relocs, optimization should already have been
- // done.
- gold_assert((insn1 & 0xfff00000) == 0x91400000);
- return aarch64_reloc_funcs::STATUS_OKAY;
- }
- // The original sequence is -
- // 90000000 adrp x0, 0 <main>
- // 91000000 add x0, x0, #0x0
- // 94000000 bl 0 <__tls_get_addr>
- // optimized to sequence -
- // d53bd040 mrs x0, tpidr_el0
- // 91400000 add x0, x0, #0x0, lsl #12
- // 91000000 add x0, x0, #0x0
- // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
- // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
- // have to change "bl tls_get_addr", which does not have a corresponding tls
- // relocation type. So before proceeding, we need to make sure compiler
- // does not change the sequence.
- if(!(insn1 == 0x90000000 // adrp x0,0
- && insn2 == 0x91000000 // add x0, x0, #0x0
- && insn3 == 0x94000000)) // bl 0
- {
- // Ideally we should give up gd_to_le relaxation and do gd access.
- // However the gd_to_le relaxation decision has been made early
- // in the scan stage, where we did not allocate a GOT entry for
- // this symbol. Therefore we have to exit and report an error now.
- gold_error(_("unexpected reloc insn sequence while relaxing "
- "tls gd to le for reloc %u."), r_type);
- return aarch64_reloc_funcs::STATUS_BAD_RELOC;
- }
- // Write new insns.
- insn1 = 0xd53bd040; // mrs x0, tpidr_el0
- insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12
- insn3 = 0x91000000; // add x0, x0, #0x0
- elfcpp::Swap<32, big_endian>::writeval(ip, insn1);
- elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2);
- elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3);
- // Calculate tprel value.
- Output_segment* tls_segment = relinfo->layout->tls_segment();
- gold_assert(tls_segment != NULL);
- AArch64_address value = psymval->value(relinfo->object, 0);
- const elfcpp::Elf_Xword addend = rela.get_r_addend();
- AArch64_address aligned_tcb_size =
- align_address(target->tcb_size(), tls_segment->maximum_alignment());
- AArch64_address x = value + aligned_tcb_size;
- // After new insns are written, apply TLSLE relocs.
- const AArch64_reloc_property* rp1 =
- aarch64_reloc_property_table->get_reloc_property(
- elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12);
- const AArch64_reloc_property* rp2 =
- aarch64_reloc_property_table->get_reloc_property(
- elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12);
- gold_assert(rp1 != NULL && rp2 != NULL);
- typename aarch64_reloc_funcs::Status s1 =
- aarch64_reloc_funcs::template rela_general<32>(view + 4,
- x,
- addend,
- rp1);
- if (s1 != aarch64_reloc_funcs::STATUS_OKAY)
- return s1;
- typename aarch64_reloc_funcs::Status s2 =
- aarch64_reloc_funcs::template rela_general<32>(view + 8,
- x,
- addend,
- rp2);
- this->skip_call_tls_get_addr_ = true;
- return s2;
- } // End of tls_ld_to_le
- template<int size, bool big_endian>
- inline
- typename AArch64_relocate_functions<size, big_endian>::Status
- Target_aarch64<size, big_endian>::Relocate::tls_ie_to_le(
- const Relocate_info<size, big_endian>* relinfo,
- Target_aarch64<size, big_endian>* target,
- const elfcpp::Rela<size, big_endian>& rela,
- unsigned int r_type,
- unsigned char* view,
- const Symbol_value<size>* psymval)
- {
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
- typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
- typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
- AArch64_address value = psymval->value(relinfo->object, 0);
- Output_segment* tls_segment = relinfo->layout->tls_segment();
- AArch64_address aligned_tcb_address =
- align_address(target->tcb_size(), tls_segment->maximum_alignment());
- const elfcpp::Elf_Xword addend = rela.get_r_addend();
- AArch64_address x = value + addend + aligned_tcb_address;
- // "x" is the offset to tp, we can only do this if x is within
- // range [0, 2^32-1]
- if (!(size == 32 || (size == 64 && (static_cast<uint64_t>(x) >> 32) == 0)))
- {
- gold_error(_("TLS variable referred by reloc %u is too far from TP."),
- r_type);
- return aarch64_reloc_funcs::STATUS_BAD_RELOC;
- }
- Insntype* ip = reinterpret_cast<Insntype*>(view);
- Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip);
- unsigned int regno;
- Insntype newinsn;
- if (r_type == elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21)
- {
- // Generate movz.
- regno = (insn & 0x1f);
- newinsn = (0xd2a00000 | regno) | (((x >> 16) & 0xffff) << 5);
- }
- else if (r_type == elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC)
- {
- // Generate movk.
- regno = (insn & 0x1f);
- gold_assert(regno == ((insn >> 5) & 0x1f));
- newinsn = (0xf2800000 | regno) | ((x & 0xffff) << 5);
- }
- else
- gold_unreachable();
- elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
- return aarch64_reloc_funcs::STATUS_OKAY;
- } // End of tls_ie_to_le
- template<int size, bool big_endian>
- inline
- typename AArch64_relocate_functions<size, big_endian>::Status
- Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_le(
- const Relocate_info<size, big_endian>* relinfo,
- Target_aarch64<size, big_endian>* target,
- const elfcpp::Rela<size, big_endian>& rela,
- unsigned int r_type,
- unsigned char* view,
- const Symbol_value<size>* psymval)
- {
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
- typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
- typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
- // TLSDESC-GD sequence is like:
- // adrp x0, :tlsdesc:v1
- // ldr x1, [x0, #:tlsdesc_lo12:v1]
- // add x0, x0, :tlsdesc_lo12:v1
- // .tlsdesccall v1
- // blr x1
- // After desc_gd_to_le optimization, the sequence will be like:
- // movz x0, #0x0, lsl #16
- // movk x0, #0x10
- // nop
- // nop
- // Calculate tprel value.
- Output_segment* tls_segment = relinfo->layout->tls_segment();
- gold_assert(tls_segment != NULL);
- Insntype* ip = reinterpret_cast<Insntype*>(view);
- const elfcpp::Elf_Xword addend = rela.get_r_addend();
- AArch64_address value = psymval->value(relinfo->object, addend);
- AArch64_address aligned_tcb_size =
- align_address(target->tcb_size(), tls_segment->maximum_alignment());
- AArch64_address x = value + aligned_tcb_size;
- // x is the offset to tp, we can only do this if x is within range
- // [0, 2^32-1]. If x is out of range, fail and exit.
- if (size == 64 && (static_cast<uint64_t>(x) >> 32) != 0)
- {
- gold_error(_("TLS variable referred by reloc %u is too far from TP. "
- "We Can't do gd_to_le relaxation.\n"), r_type);
- return aarch64_reloc_funcs::STATUS_BAD_RELOC;
- }
- Insntype newinsn;
- switch (r_type)
- {
- case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
- case elfcpp::R_AARCH64_TLSDESC_CALL:
- // Change to nop
- newinsn = 0xd503201f;
- break;
- case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
- // Change to movz.
- newinsn = 0xd2a00000 | (((x >> 16) & 0xffff) << 5);
- break;
- case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
- // Change to movk.
- newinsn = 0xf2800000 | ((x & 0xffff) << 5);
- break;
- default:
- gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
- r_type);
- gold_unreachable();
- }
- elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
- return aarch64_reloc_funcs::STATUS_OKAY;
- } // End of tls_desc_gd_to_le
- template<int size, bool big_endian>
- inline
- typename AArch64_relocate_functions<size, big_endian>::Status
- Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_ie(
- const Relocate_info<size, big_endian>* /* relinfo */,
- Target_aarch64<size, big_endian>* /* target */,
- const elfcpp::Rela<size, big_endian>& rela,
- unsigned int r_type,
- unsigned char* view,
- const Symbol_value<size>* /* psymval */,
- typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address,
- typename elfcpp::Elf_types<size>::Elf_Addr address)
- {
- typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
- typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
- // TLSDESC-GD sequence is like:
- // adrp x0, :tlsdesc:v1
- // ldr x1, [x0, #:tlsdesc_lo12:v1]
- // add x0, x0, :tlsdesc_lo12:v1
- // .tlsdesccall v1
- // blr x1
- // After desc_gd_to_ie optimization, the sequence will be like:
- // adrp x0, :tlsie:v1
- // ldr x0, [x0, :tlsie_lo12:v1]
- // nop
- // nop
- Insntype* ip = reinterpret_cast<Insntype*>(view);
- const elfcpp::Elf_Xword addend = rela.get_r_addend();
- Insntype newinsn;
- switch (r_type)
- {
- case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
- case elfcpp::R_AARCH64_TLSDESC_CALL:
- // Change to nop
- newinsn = 0xd503201f;
- elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
- break;
- case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
- {
- return aarch64_reloc_funcs::adrp(view, got_entry_address + addend,
- address);
- }
- break;
- case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
- {
- // Set ldr target register to be x0.
- Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip);
- insn &= 0xffffffe0;
- elfcpp::Swap<32, big_endian>::writeval(ip, insn);
- // Do relocation.
- const AArch64_reloc_property* reloc_property =
- aarch64_reloc_property_table->get_reloc_property(
- elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC);
- return aarch64_reloc_funcs::template rela_general<32>(
- view, got_entry_address, addend, reloc_property);
- }
- break;
- default:
- gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
- r_type);
- gold_unreachable();
- }
- return aarch64_reloc_funcs::STATUS_OKAY;
- } // End of tls_desc_gd_to_ie
- // Relocate section data.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::relocate_section(
- const Relocate_info<size, big_endian>* relinfo,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- unsigned char* view,
- typename elfcpp::Elf_types<size>::Elf_Addr address,
- section_size_type view_size,
- const Reloc_symbol_changes* reloc_symbol_changes)
- {
- typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
- typedef Target_aarch64<size, big_endian> Aarch64;
- typedef typename Target_aarch64<size, big_endian>::Relocate AArch64_relocate;
- typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
- Classify_reloc;
- gold_assert(sh_type == elfcpp::SHT_RELA);
- // See if we are relocating a relaxed input section. If so, the view
- // covers the whole output section and we need to adjust accordingly.
- if (needs_special_offset_handling)
- {
- const Output_relaxed_input_section* poris =
- output_section->find_relaxed_input_section(relinfo->object,
- relinfo->data_shndx);
- if (poris != NULL)
- {
- Address section_address = poris->address();
- section_size_type section_size = poris->data_size();
- gold_assert((section_address >= address)
- && ((section_address + section_size)
- <= (address + view_size)));
- off_t offset = section_address - address;
- view += offset;
- address += offset;
- view_size = section_size;
- }
- }
- gold::relocate_section<size, big_endian, Aarch64, AArch64_relocate,
- gold::Default_comdat_behavior, Classify_reloc>(
- relinfo,
- this,
- prelocs,
- reloc_count,
- output_section,
- needs_special_offset_handling,
- view,
- address,
- view_size,
- reloc_symbol_changes);
- }
- // Scan the relocs during a relocatable link.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::scan_relocatable_relocs(
- Symbol_table* symtab,
- Layout* layout,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int data_shndx,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- size_t local_symbol_count,
- const unsigned char* plocal_symbols,
- Relocatable_relocs* rr)
- {
- typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
- Classify_reloc;
- typedef gold::Default_scan_relocatable_relocs<Classify_reloc>
- Scan_relocatable_relocs;
- gold_assert(sh_type == elfcpp::SHT_RELA);
- gold::scan_relocatable_relocs<size, big_endian, Scan_relocatable_relocs>(
- symtab,
- layout,
- object,
- data_shndx,
- prelocs,
- reloc_count,
- output_section,
- needs_special_offset_handling,
- local_symbol_count,
- plocal_symbols,
- rr);
- }
- // Scan the relocs for --emit-relocs.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::emit_relocs_scan(
- Symbol_table* symtab,
- Layout* layout,
- Sized_relobj_file<size, big_endian>* object,
- unsigned int data_shndx,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- bool needs_special_offset_handling,
- size_t local_symbol_count,
- const unsigned char* plocal_syms,
- Relocatable_relocs* rr)
- {
- typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
- Classify_reloc;
- typedef gold::Default_emit_relocs_strategy<Classify_reloc>
- Emit_relocs_strategy;
- gold_assert(sh_type == elfcpp::SHT_RELA);
- gold::scan_relocatable_relocs<size, big_endian, Emit_relocs_strategy>(
- symtab,
- layout,
- object,
- data_shndx,
- prelocs,
- reloc_count,
- output_section,
- needs_special_offset_handling,
- local_symbol_count,
- plocal_syms,
- rr);
- }
- // Relocate a section during a relocatable link.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::relocate_relocs(
- const Relocate_info<size, big_endian>* relinfo,
- unsigned int sh_type,
- const unsigned char* prelocs,
- size_t reloc_count,
- Output_section* output_section,
- typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
- unsigned char* view,
- typename elfcpp::Elf_types<size>::Elf_Addr view_address,
- section_size_type view_size,
- unsigned char* reloc_view,
- section_size_type reloc_view_size)
- {
- typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
- Classify_reloc;
- gold_assert(sh_type == elfcpp::SHT_RELA);
- gold::relocate_relocs<size, big_endian, Classify_reloc>(
- relinfo,
- prelocs,
- reloc_count,
- output_section,
- offset_in_output_section,
- view,
- view_address,
- view_size,
- reloc_view,
- reloc_view_size);
- }
- // Return whether this is a 3-insn erratum sequence.
- template<int size, bool big_endian>
- bool
- Target_aarch64<size, big_endian>::is_erratum_843419_sequence(
- typename elfcpp::Swap<32,big_endian>::Valtype insn1,
- typename elfcpp::Swap<32,big_endian>::Valtype insn2,
- typename elfcpp::Swap<32,big_endian>::Valtype insn3)
- {
- unsigned rt1, rt2;
- bool load, pair;
- // The 2nd insn is a single register load or store; or register pair
- // store.
- if (Insn_utilities::aarch64_mem_op_p(insn2, &rt1, &rt2, &pair, &load)
- && (!pair || (pair && !load)))
- {
- // The 3rd insn is a load or store instruction from the "Load/store
- // register (unsigned immediate)" encoding class, using Rn as the
- // base address register.
- if (Insn_utilities::aarch64_ldst_uimm(insn3)
- && (Insn_utilities::aarch64_rn(insn3)
- == Insn_utilities::aarch64_rd(insn1)))
- return true;
- }
- return false;
- }
- // Return whether this is a 835769 sequence.
- // (Similarly implemented as in elfnn-aarch64.c.)
- template<int size, bool big_endian>
- bool
- Target_aarch64<size, big_endian>::is_erratum_835769_sequence(
- typename elfcpp::Swap<32,big_endian>::Valtype insn1,
- typename elfcpp::Swap<32,big_endian>::Valtype insn2)
- {
- uint32_t rt;
- uint32_t rt2 = 0;
- uint32_t rn;
- uint32_t rm;
- uint32_t ra;
- bool pair;
- bool load;
- if (Insn_utilities::aarch64_mlxl(insn2)
- && Insn_utilities::aarch64_mem_op_p (insn1, &rt, &rt2, &pair, &load))
- {
- /* Any SIMD memory op is independent of the subsequent MLA
- by definition of the erratum. */
- if (Insn_utilities::aarch64_bit(insn1, 26))
- return true;
- /* If not SIMD, check for integer memory ops and MLA relationship. */
- rn = Insn_utilities::aarch64_rn(insn2);
- ra = Insn_utilities::aarch64_ra(insn2);
- rm = Insn_utilities::aarch64_rm(insn2);
- /* If this is a load and there's a true(RAW) dependency, we are safe
- and this is not an erratum sequence. */
- if (load &&
- (rt == rn || rt == rm || rt == ra
- || (pair && (rt2 == rn || rt2 == rm || rt2 == ra))))
- return false;
- /* We conservatively put out stubs for all other cases (including
- writebacks). */
- return true;
- }
- return false;
- }
- // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::create_erratum_stub(
- AArch64_relobj<size, big_endian>* relobj,
- unsigned int shndx,
- section_size_type erratum_insn_offset,
- Address erratum_address,
- typename Insn_utilities::Insntype erratum_insn,
- int erratum_type,
- unsigned int e843419_adrp_offset)
- {
- gold_assert(erratum_type == ST_E_843419 || erratum_type == ST_E_835769);
- The_stub_table* stub_table = relobj->stub_table(shndx);
- gold_assert(stub_table != NULL);
- if (stub_table->find_erratum_stub(relobj,
- shndx,
- erratum_insn_offset) == NULL)
- {
- const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
- The_erratum_stub* stub;
- if (erratum_type == ST_E_835769)
- stub = new The_erratum_stub(relobj, erratum_type, shndx,
- erratum_insn_offset);
- else if (erratum_type == ST_E_843419)
- stub = new E843419_stub<size, big_endian>(
- relobj, shndx, erratum_insn_offset, e843419_adrp_offset);
- else
- gold_unreachable();
- stub->set_erratum_insn(erratum_insn);
- stub->set_erratum_address(erratum_address);
- // For erratum ST_E_843419 and ST_E_835769, the destination address is
- // always the next insn after erratum insn.
- stub->set_destination_address(erratum_address + BPI);
- stub_table->add_erratum_stub(stub);
- }
- }
- // Scan erratum for section SHNDX range [output_address + span_start,
- // output_address + span_end). Note here we do not share the code with
- // scan_erratum_843419_span function, because for 843419 we optimize by only
- // scanning the last few insns of a page, whereas for 835769, we need to scan
- // every insn.
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::scan_erratum_835769_span(
- AArch64_relobj<size, big_endian>* relobj,
- unsigned int shndx,
- const section_size_type span_start,
- const section_size_type span_end,
- unsigned char* input_view,
- Address output_address)
- {
- typedef typename Insn_utilities::Insntype Insntype;
- const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
- // Adjust output_address and view to the start of span.
- output_address += span_start;
- input_view += span_start;
- section_size_type span_length = span_end - span_start;
- section_size_type offset = 0;
- for (offset = 0; offset + BPI < span_length; offset += BPI)
- {
- Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset);
- Insntype insn1 = ip[0];
- Insntype insn2 = ip[1];
- if (is_erratum_835769_sequence(insn1, insn2))
- {
- Insntype erratum_insn = insn2;
- // "span_start + offset" is the offset for insn1. So for insn2, it is
- // "span_start + offset + BPI".
- section_size_type erratum_insn_offset = span_start + offset + BPI;
- Address erratum_address = output_address + offset + BPI;
- gold_info(_("Erratum 835769 found and fixed at \"%s\", "
- "section %d, offset 0x%08x."),
- relobj->name().c_str(), shndx,
- (unsigned int)(span_start + offset));
- this->create_erratum_stub(relobj, shndx,
- erratum_insn_offset, erratum_address,
- erratum_insn, ST_E_835769);
- offset += BPI; // Skip mac insn.
- }
- }
- } // End of "Target_aarch64::scan_erratum_835769_span".
- // Scan erratum for section SHNDX range
- // [output_address + span_start, output_address + span_end).
- template<int size, bool big_endian>
- void
- Target_aarch64<size, big_endian>::scan_erratum_843419_span(
- AArch64_relobj<size, big_endian>* relobj,
- unsigned int shndx,
- const section_size_type span_start,
- const section_size_type span_end,
- unsigned char* input_view,
- Address output_address)
- {
- typedef typename Insn_utilities::Insntype Insntype;
- // Adjust output_address and view to the start of span.
- output_address += span_start;
- input_view += span_start;
- if ((output_address & 0x03) != 0)
- return;
- section_size_type offset = 0;
- section_size_type span_length = span_end - span_start;
- // The first instruction must be ending at 0xFF8 or 0xFFC.
- unsigned int page_offset = output_address & 0xFFF;
- // Make sure starting position, that is "output_address+offset",
- // starts at page position 0xff8 or 0xffc.
- if (page_offset < 0xff8)
- offset = 0xff8 - page_offset;
- while (offset + 3 * Insn_utilities::BYTES_PER_INSN <= span_length)
- {
- Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset);
- Insntype insn1 = ip[0];
- if (Insn_utilities::is_adrp(insn1))
- {
- Insntype insn2 = ip[1];
- Insntype insn3 = ip[2];
- Insntype erratum_insn;
- unsigned insn_offset;
- bool do_report = false;
- if (is_erratum_843419_sequence(insn1, insn2, insn3))
- {
- do_report = true;
- erratum_insn = insn3;
- insn_offset = 2 * Insn_utilities::BYTES_PER_INSN;
- }
- else if (offset + 4 * Insn_utilities::BYTES_PER_INSN <= span_length)
- {
- // Optionally we can have an insn between ins2 and ins3
- Insntype insn_opt = ip[2];
- // And insn_opt must not be a branch.
- if (!Insn_utilities::aarch64_b(insn_opt)
- && !Insn_utilities::aarch64_bl(insn_opt)
- && !Insn_utilities::aarch64_blr(insn_opt)
- && !Insn_utilities::aarch64_br(insn_opt))
- {
- // And insn_opt must not write to dest reg in insn1. However
- // we do a conservative scan, which means we may fix/report
- // more than necessary, but it doesn't hurt.
- Insntype insn4 = ip[3];
- if (is_erratum_843419_sequence(insn1, insn2, insn4))
- {
- do_report = true;
- erratum_insn = insn4;
- insn_offset = 3 * Insn_utilities::BYTES_PER_INSN;
- }
- }
- }
- if (do_report)
- {
- unsigned int erratum_insn_offset =
- span_start + offset + insn_offset;
- Address erratum_address =
- output_address + offset + insn_offset;
- create_erratum_stub(relobj, shndx,
- erratum_insn_offset, erratum_address,
- erratum_insn, ST_E_843419,
- span_start + offset);
- }
- }
- // Advance to next candidate instruction. We only consider instruction
- // sequences starting at a page offset of 0xff8 or 0xffc.
- page_offset = (output_address + offset) & 0xfff;
- if (page_offset == 0xff8)
- offset += 4;
- else // (page_offset == 0xffc), we move to next page's 0xff8.
- offset += 0xffc;
- }
- } // End of "Target_aarch64::scan_erratum_843419_span".
- // The selector for aarch64 object files.
- template<int size, bool big_endian>
- class Target_selector_aarch64 : public Target_selector
- {
- public:
- Target_selector_aarch64();
- virtual Target*
- do_instantiate_target()
- { return new Target_aarch64<size, big_endian>(); }
- };
- template<>
- Target_selector_aarch64<32, true>::Target_selector_aarch64()
- : Target_selector(elfcpp::EM_AARCH64, 32, true,
- "elf32-bigaarch64", "aarch64_elf32_be_vec")
- { }
- template<>
- Target_selector_aarch64<32, false>::Target_selector_aarch64()
- : Target_selector(elfcpp::EM_AARCH64, 32, false,
- "elf32-littleaarch64", "aarch64_elf32_le_vec")
- { }
- template<>
- Target_selector_aarch64<64, true>::Target_selector_aarch64()
- : Target_selector(elfcpp::EM_AARCH64, 64, true,
- "elf64-bigaarch64", "aarch64_elf64_be_vec")
- { }
- template<>
- Target_selector_aarch64<64, false>::Target_selector_aarch64()
- : Target_selector(elfcpp::EM_AARCH64, 64, false,
- "elf64-littleaarch64", "aarch64_elf64_le_vec")
- { }
- Target_selector_aarch64<32, true> target_selector_aarch64elf32b;
- Target_selector_aarch64<32, false> target_selector_aarch64elf32;
- Target_selector_aarch64<64, true> target_selector_aarch64elfb;
- Target_selector_aarch64<64, false> target_selector_aarch64elf;
- } // End anonymous namespace.
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