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- /* ft32-specific support for 32-bit ELF.
- Copyright (C) 2013-2022 Free Software Foundation, Inc.
- Copied from elf32-moxie.c which is..
- Copyright (C) 2009-2022 Free Software Foundation, Inc.
- Free Software Foundation, Inc.
- This file is part of BFD, the Binary File Descriptor library.
- 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 "sysdep.h"
- #include "bfd.h"
- #include "libbfd.h"
- #include "elf-bfd.h"
- #include "elf/ft32.h"
- #include "opcode/ft32.h"
- static bool debug_relax = false;
- static bfd_reloc_status_type
- bfd_elf_ft32_diff_reloc (bfd *, arelent *, asymbol *, void *,
- asection *, bfd *, char **);
- static reloc_howto_type ft32_elf_howto_table [] =
- {
- /* This reloc does nothing. */
- HOWTO (R_FT32_NONE, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 32, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_NONE", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- /* A 32 bit absolute relocation. */
- HOWTO (R_FT32_32, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 32, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_32", /* name */
- false, /* partial_inplace */
- 0x00000000, /* src_mask */
- 0xffffffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_FT32_16, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 16, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_16", /* name */
- false, /* partial_inplace */
- 0x00000000, /* src_mask */
- 0x0000ffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_FT32_8, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 8, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_8", /* name */
- false, /* partial_inplace */
- 0x00000000, /* src_mask */
- 0x000000ff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_FT32_10, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 10, /* bitsize */
- false, /* pc_relative */
- 4, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_10", /* name */
- false, /* partial_inplace */
- 0x00000000, /* src_mask */
- 0x00003ff0, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_FT32_20, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 20, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_20", /* name */
- false, /* partial_inplace */
- 0x00000000, /* src_mask */
- 0x000fffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_FT32_17, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 17, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_17", /* name */
- false, /* partial_inplace */
- 0x00000000, /* src_mask */
- 0x0001ffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_FT32_18, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 18, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_18", /* name */
- false, /* partial_inplace */
- 0x00000000, /* src_mask */
- 0x0003ffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_FT32_RELAX, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 10, /* bitsize */
- false, /* pc_relative */
- 4, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_RELAX", /* name */
- false, /* partial_inplace */
- 0x00000000, /* src_mask */
- 0x00000000, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_FT32_SC0, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 10, /* bitsize */
- false, /* pc_relative */
- 4, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_SC0", /* name */
- false, /* partial_inplace */
- 0x00000000, /* src_mask */
- 0x00000000, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_FT32_SC1, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 22, /* bitsize */
- true, /* pc_relative */
- 7, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_SC1", /* name */
- true, /* partial_inplace */
- 0x07ffff80, /* src_mask */
- 0x07ffff80, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_FT32_15, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 15, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_FT32_15", /* name */
- false, /* partial_inplace */
- 0x00000000, /* src_mask */
- 0x00007fff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_FT32_DIFF32, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 32, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_ft32_diff_reloc, /* special_function */
- "R_FT32_DIFF32", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffffffff, /* dst_mask */
- false), /* pcrel_offset */
- };
- /* Map BFD reloc types to FT32 ELF reloc types. */
- struct ft32_reloc_map
- {
- bfd_reloc_code_real_type bfd_reloc_val;
- unsigned int ft32_reloc_val;
- };
- static const struct ft32_reloc_map ft32_reloc_map [] =
- {
- { BFD_RELOC_NONE, R_FT32_NONE },
- { BFD_RELOC_32, R_FT32_32 },
- { BFD_RELOC_16, R_FT32_16 },
- { BFD_RELOC_8, R_FT32_8 },
- { BFD_RELOC_FT32_10, R_FT32_10 },
- { BFD_RELOC_FT32_20, R_FT32_20 },
- { BFD_RELOC_FT32_17, R_FT32_17 },
- { BFD_RELOC_FT32_18, R_FT32_18 },
- { BFD_RELOC_FT32_RELAX, R_FT32_RELAX },
- { BFD_RELOC_FT32_SC0, R_FT32_SC0 },
- { BFD_RELOC_FT32_SC1, R_FT32_SC1 },
- { BFD_RELOC_FT32_15, R_FT32_15 },
- { BFD_RELOC_FT32_DIFF32, R_FT32_DIFF32 },
- };
- /* Perform a diff relocation. Nothing to do, as the difference value is
- already written into the section's contents. */
- static bfd_reloc_status_type
- bfd_elf_ft32_diff_reloc (bfd *abfd ATTRIBUTE_UNUSED,
- arelent *reloc_entry ATTRIBUTE_UNUSED,
- asymbol *symbol ATTRIBUTE_UNUSED,
- void *data ATTRIBUTE_UNUSED,
- asection *input_section ATTRIBUTE_UNUSED,
- bfd *output_bfd ATTRIBUTE_UNUSED,
- char **error_message ATTRIBUTE_UNUSED)
- {
- return bfd_reloc_ok;
- }
- static reloc_howto_type *
- ft32_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
- bfd_reloc_code_real_type code)
- {
- unsigned int i;
- for (i = 0; i < sizeof (ft32_reloc_map) / sizeof (ft32_reloc_map[0]); i++)
- if (ft32_reloc_map [i].bfd_reloc_val == code)
- return & ft32_elf_howto_table [ft32_reloc_map[i].ft32_reloc_val];
- return NULL;
- }
- static reloc_howto_type *
- ft32_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
- {
- unsigned int i;
- for (i = 0;
- i < sizeof (ft32_elf_howto_table) / sizeof (ft32_elf_howto_table[0]);
- i++)
- if (ft32_elf_howto_table[i].name != NULL
- && strcasecmp (ft32_elf_howto_table[i].name, r_name) == 0)
- return &ft32_elf_howto_table[i];
- return NULL;
- }
- /* Set the howto pointer for an FT32 ELF reloc. */
- static bool
- ft32_info_to_howto_rela (bfd *abfd,
- arelent *cache_ptr,
- Elf_Internal_Rela *dst)
- {
- unsigned int r_type;
- r_type = ELF32_R_TYPE (dst->r_info);
- if (r_type >= (unsigned int) R_FT32_max)
- {
- /* xgettext:c-format */
- _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
- abfd, r_type);
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- cache_ptr->howto = & ft32_elf_howto_table [r_type];
- return cache_ptr->howto != NULL;
- }
- /* Relocate an FT32 ELF section.
- The RELOCATE_SECTION function is called by the new ELF backend linker
- to handle the relocations for a section.
- The relocs are always passed as Rela structures; if the section
- actually uses Rel structures, the r_addend field will always be
- zero.
- This function is responsible for adjusting the section contents as
- necessary, and (if using Rela relocs and generating a relocatable
- output file) adjusting the reloc addend as necessary.
- This function does not have to worry about setting the reloc
- address or the reloc symbol index.
- LOCAL_SYMS is a pointer to the swapped in local symbols.
- LOCAL_SECTIONS is an array giving the section in the input file
- corresponding to the st_shndx field of each local symbol.
- The global hash table entry for the global symbols can be found
- via elf_sym_hashes (input_bfd).
- When generating relocatable output, this function must handle
- STB_LOCAL/STT_SECTION symbols specially. The output symbol is
- going to be the section symbol corresponding to the output
- section, which means that the addend must be adjusted
- accordingly. */
- static int
- ft32_elf_relocate_section (bfd *output_bfd,
- struct bfd_link_info *info,
- bfd *input_bfd,
- asection *input_section,
- bfd_byte *contents,
- Elf_Internal_Rela *relocs,
- Elf_Internal_Sym *local_syms,
- asection **local_sections)
- {
- Elf_Internal_Shdr *symtab_hdr;
- struct elf_link_hash_entry **sym_hashes;
- Elf_Internal_Rela *rel;
- Elf_Internal_Rela *relend;
- symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
- sym_hashes = elf_sym_hashes (input_bfd);
- relend = relocs + input_section->reloc_count;
- for (rel = relocs; rel < relend; rel ++)
- {
- reloc_howto_type *howto;
- unsigned long r_symndx;
- Elf_Internal_Sym *sym;
- asection *sec;
- struct elf_link_hash_entry *h;
- bfd_vma relocation;
- bfd_reloc_status_type r;
- const char *name;
- int r_type;
- r_type = ELF32_R_TYPE (rel->r_info);
- r_symndx = ELF32_R_SYM (rel->r_info);
- howto = ft32_elf_howto_table + r_type;
- h = NULL;
- sym = NULL;
- sec = NULL;
- if (r_symndx < symtab_hdr->sh_info)
- {
- sym = local_syms + r_symndx;
- sec = local_sections [r_symndx];
- relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
- name = bfd_elf_string_from_elf_section
- (input_bfd, symtab_hdr->sh_link, sym->st_name);
- name = name == NULL ? bfd_section_name (sec) : name;
- }
- else
- {
- bool unresolved_reloc, warned, ignored;
- RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
- r_symndx, symtab_hdr, sym_hashes,
- h, sec, relocation,
- unresolved_reloc, warned, ignored);
- name = h->root.root.string;
- }
- if (sec != NULL && discarded_section (sec))
- RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
- rel, 1, relend, howto, 0, contents);
- if (bfd_link_relocatable (info))
- continue;
- switch (howto->type)
- {
- case R_FT32_SC0:
- {
- unsigned int insn;
- int offset;
- unsigned int code15[2];
- insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
- ft32_split_shortcode (insn, code15);
- offset = (int)relocation;
- offset += (int)(rel->r_addend - rel->r_offset);
- offset -= (input_section->output_section->vma +
- input_section->output_offset);
- if ((offset < -1024) || (offset >= 1024))
- {
- r = bfd_reloc_outofrange;
- break;
- }
- code15[0] |= ((offset / 4) & 511);
- insn = ft32_merge_shortcode (code15);
- bfd_put_32 (input_bfd, insn, contents + rel->r_offset);
- }
- r = bfd_reloc_ok;
- break;
- case R_FT32_SC1:
- {
- unsigned int insn;
- int offset;
- unsigned int code15[2];
- insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
- ft32_split_shortcode (insn, code15);
- offset = (int)relocation;
- offset += (int)(rel->r_addend - rel->r_offset);
- offset -= (input_section->output_section->vma +
- input_section->output_offset);
- if ((offset < -1024) || (offset >= 1024))
- {
- r = bfd_reloc_outofrange;
- break;
- }
- code15[1] |= ((offset / 4) & 511);
- insn = ft32_merge_shortcode (code15);
- bfd_put_32 (input_bfd, insn, contents + rel->r_offset);
- }
- r = bfd_reloc_ok;
- break;
- case R_FT32_DIFF32:
- r = bfd_reloc_ok;
- break;
- default:
- r = _bfd_final_link_relocate (howto, input_bfd, input_section,
- contents, rel->r_offset,
- relocation, rel->r_addend);
- break;
- }
- if (r != bfd_reloc_ok)
- {
- const char * msg = NULL;
- switch (r)
- {
- case bfd_reloc_overflow:
- (*info->callbacks->reloc_overflow)
- (info, (h ? &h->root : NULL), name, howto->name,
- (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
- break;
- case bfd_reloc_undefined:
- (*info->callbacks->undefined_symbol)
- (info, name, input_bfd, input_section, rel->r_offset, true);
- break;
- case bfd_reloc_outofrange:
- msg = _("internal error: out of range error");
- break;
- case bfd_reloc_notsupported:
- msg = _("internal error: unsupported relocation error");
- break;
- case bfd_reloc_dangerous:
- msg = _("internal error: dangerous relocation");
- break;
- default:
- msg = _("internal error: unknown error");
- break;
- }
- if (msg)
- (*info->callbacks->warning) (info, msg, name, input_bfd,
- input_section, rel->r_offset);
- }
- }
- return true;
- }
- /* Relaxation. */
- static bool
- ft32_reloc_shortable
- (bfd * abfd,
- asection * sec,
- Elf_Internal_Sym * isymbuf ATTRIBUTE_UNUSED,
- bfd_byte * contents,
- bfd_vma pc ATTRIBUTE_UNUSED,
- Elf_Internal_Rela * irel,
- unsigned int * sc)
- {
- Elf_Internal_Shdr *symtab_hdr ATTRIBUTE_UNUSED;
- bfd_vma symval;
- enum elf_ft32_reloc_type r_type;
- reloc_howto_type *howto = NULL;
- unsigned int insn;
- int offset;
- bfd_vma dot, value;
- r_type = ELF32_R_TYPE (irel->r_info);
- howto = &ft32_elf_howto_table [r_type];
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- /* Get the value of the symbol referred to by the reloc. */
- if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
- {
- /* A local symbol. */
- Elf_Internal_Sym *isym;
- asection *sym_sec;
- isym = isymbuf + ELF32_R_SYM (irel->r_info);
- sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
- symval = isym->st_value;
- /* If the reloc is absolute, it will not have
- a symbol or section associated with it. */
- if (sym_sec)
- symval += sym_sec->output_section->vma
- + sym_sec->output_offset;
- }
- else
- {
- unsigned long indx;
- struct elf_link_hash_entry *h;
- /* An external symbol. */
- indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
- h = elf_sym_hashes (abfd)[indx];
- BFD_ASSERT (h != NULL);
- if (h->root.type != bfd_link_hash_defined
- && h->root.type != bfd_link_hash_defweak)
- /* This appears to be a reference to an undefined
- symbol. Just ignore it--it will be caught by the
- regular reloc processing. */
- return false;
- symval = (h->root.u.def.value
- + h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset);
- }
- switch (r_type)
- {
- case R_FT32_8:
- case R_FT32_10:
- case R_FT32_16:
- case R_FT32_20:
- case R_FT32_RELAX:
- if (symval != 0)
- return false;
- insn = bfd_get_32 (abfd, contents + irel->r_offset);
- insn |= ((symval + irel->r_addend) << howto->bitpos) & howto->dst_mask;
- return ft32_shortcode (insn, sc);
- case R_FT32_18:
- insn = bfd_get_32 (abfd, contents + irel->r_offset);
- /* Get the address of this instruction. */
- dot = (sec->output_section->vma
- + sec->output_offset + irel->r_offset);
- value = symval + irel->r_addend;
- offset = (value - dot) / 4;
- if ((dot > 0x8c) && (-256 <= offset) && (offset < 256))
- {
- switch (insn)
- {
- case 0x00200000: *sc = (3 << 13) | (0 << 9); return true;
- case 0x00280000: *sc = (3 << 13) | (1 << 9); return true;
- case 0x00600000: *sc = (3 << 13) | (2 << 9); return true;
- case 0x00680000: *sc = (3 << 13) | (3 << 9); return true;
- case 0x00a00000: *sc = (3 << 13) | (4 << 9); return true;
- case 0x00a80000: *sc = (3 << 13) | (5 << 9); return true;
- case 0x00e00000: *sc = (3 << 13) | (6 << 9); return true;
- case 0x00e80000: *sc = (3 << 13) | (7 << 9); return true;
- case 0x01200000: *sc = (3 << 13) | (8 << 9); return true;
- case 0x01280000: *sc = (3 << 13) | (9 << 9); return true;
- case 0x01600000: *sc = (3 << 13) | (10 << 9); return true;
- case 0x01680000: *sc = (3 << 13) | (11 << 9); return true;
- case 0x01a00000: *sc = (3 << 13) | (12 << 9); return true;
- case 0x01a80000: *sc = (3 << 13) | (13 << 9); return true;
- case 0x00300000: *sc = (3 << 13) | (14 << 9); return true;
- case 0x00340000: *sc = (3 << 13) | (15 << 9); return true;
- default:
- break;
- }
- }
- break;
- default:
- break;
- }
- return false;
- }
- /* Returns whether the relocation type passed is a diff reloc. */
- static bool
- elf32_ft32_is_diff_reloc (Elf_Internal_Rela *irel)
- {
- return (ELF32_R_TYPE (irel->r_info) == R_FT32_DIFF32);
- }
- /* Reduce the diff value written in the section by count if the shrinked
- insn address happens to fall between the two symbols for which this
- diff reloc was emitted. */
- static bool
- elf32_ft32_adjust_diff_reloc_value (bfd *abfd,
- struct bfd_section *isec,
- Elf_Internal_Rela *irel,
- bfd_vma symval,
- bfd_vma shrinked_insn_address,
- int count)
- {
- unsigned char * reloc_contents = NULL;
- unsigned char * isec_contents = elf_section_data (isec)->this_hdr.contents;
- bfd_signed_vma x = 0;
- bfd_vma sym2_address;
- bfd_vma sym1_address;
- bfd_vma start_address;
- bfd_vma end_address;
- if (isec_contents == NULL)
- {
- if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents))
- return false;
- elf_section_data (isec)->this_hdr.contents = isec_contents;
- }
- reloc_contents = isec_contents + irel->r_offset;
- /* Read value written in object file. */
- switch (ELF32_R_TYPE (irel->r_info))
- {
- case R_FT32_DIFF32:
- x = bfd_get_signed_32 (abfd, reloc_contents);
- break;
- default:
- return false;
- }
- /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written
- into the object file at the reloc offset. sym2's logical value is
- symval (<start_of_section>) + reloc addend. Compute the start and end
- addresses and check if the shrinked insn falls between sym1 and sym2. */
- sym2_address = symval + irel->r_addend;
- sym1_address = sym2_address - x;
- /* Don't assume sym2 is bigger than sym1 - the difference
- could be negative. Compute start and end addresses, and
- use those to see if they span shrinked_insn_address. */
- start_address = sym1_address < sym2_address ? sym1_address : sym2_address;
- end_address = sym1_address > sym2_address ? sym1_address : sym2_address;
- if (shrinked_insn_address >= start_address
- && shrinked_insn_address < end_address)
- {
- /* Reduce the diff value by count bytes and write it back into section
- contents. */
- bfd_signed_vma new_diff = x < 0 ? x + count : x - count;
- if (sym2_address > shrinked_insn_address)
- irel->r_addend -= count;
- switch (ELF32_R_TYPE (irel->r_info))
- {
- case R_FT32_DIFF32:
- bfd_put_signed_32 (abfd, new_diff & 0xFFFFFFFF, reloc_contents);
- break;
- default:
- return false;
- }
- }
- return true;
- }
- static bool
- elf32_ft32_adjust_reloc_if_spans_insn (bfd *abfd,
- asection *isec,
- Elf_Internal_Rela *irel, bfd_vma symval,
- bfd_vma shrinked_insn_address,
- bfd_vma shrink_boundary,
- int count)
- {
- if (elf32_ft32_is_diff_reloc (irel))
- {
- if (!elf32_ft32_adjust_diff_reloc_value (abfd, isec, irel,
- symval,
- shrinked_insn_address,
- count))
- return false;
- }
- else
- {
- bfd_vma reloc_value = symval + irel->r_addend;
- bool addend_within_shrink_boundary =
- (reloc_value <= shrink_boundary);
- bool reloc_spans_insn =
- (symval <= shrinked_insn_address
- && reloc_value > shrinked_insn_address
- && addend_within_shrink_boundary);
- if (! reloc_spans_insn)
- return true;
- irel->r_addend -= count;
- if (debug_relax)
- printf ("Relocation's addend needed to be fixed \n");
- }
- return true;
- }
- /* Delete some bytes from a section while relaxing. */
- static bool
- elf32_ft32_relax_delete_bytes (struct bfd_link_info *link_info, bfd * abfd,
- asection * sec, bfd_vma addr, int count)
- {
- Elf_Internal_Shdr *symtab_hdr;
- unsigned int sec_shndx;
- bfd_byte *contents;
- Elf_Internal_Rela *irel, *irelend;
- bfd_vma toaddr;
- Elf_Internal_Sym *isym;
- Elf_Internal_Sym *isymend;
- struct elf_link_hash_entry **sym_hashes;
- struct elf_link_hash_entry **end_hashes;
- struct elf_link_hash_entry **start_hashes;
- unsigned int symcount;
- Elf_Internal_Sym *isymbuf = NULL;
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
- contents = elf_section_data (sec)->this_hdr.contents;
- toaddr = sec->size;
- irel = elf_section_data (sec)->relocs;
- irelend = irel + sec->reloc_count;
- /* Actually delete the bytes. */
- memmove (contents + addr, contents + addr + count,
- (size_t) (toaddr - addr - count));
- sec->size -= count;
- /* Adjust all the relocs. */
- for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
- /* Get the new reloc address. */
- if ((irel->r_offset > addr && irel->r_offset < toaddr))
- irel->r_offset -= count;
- /* The reloc's own addresses are now ok. However, we need to readjust
- the reloc's addend, i.e. the reloc's value if two conditions are met:
- 1.) the reloc is relative to a symbol in this section that
- is located in front of the shrinked instruction
- 2.) symbol plus addend end up behind the shrinked instruction.
- The most common case where this happens are relocs relative to
- the section-start symbol.
- This step needs to be done for all of the sections of the bfd. */
- {
- struct bfd_section *isec;
- for (isec = abfd->sections; isec; isec = isec->next)
- {
- bfd_vma symval;
- bfd_vma shrinked_insn_address;
- if (isec->reloc_count == 0)
- continue;
- shrinked_insn_address = (sec->output_section->vma
- + sec->output_offset + addr - count);
- irel = elf_section_data (isec)->relocs;
- /* PR 12161: Read in the relocs for this section if necessary. */
- if (irel == NULL)
- irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, true);
- for (irelend = irel + isec->reloc_count; irel < irelend; irel++)
- {
- /* Read this BFD's local symbols if we haven't done
- so already. */
- if (isymbuf == NULL && symtab_hdr->sh_info != 0)
- {
- isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (isymbuf == NULL)
- isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
- symtab_hdr->sh_info, 0,
- NULL, NULL, NULL);
- if (isymbuf == NULL)
- return false;
- }
- /* Get the value of the symbol referred to by the reloc. */
- if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
- {
- /* A local symbol. */
- asection *sym_sec;
- isym = isymbuf + ELF32_R_SYM (irel->r_info);
- sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
- symval = isym->st_value;
- /* If the reloc is absolute, it will not have
- a symbol or section associated with it. */
- if (sym_sec == sec)
- {
- symval += sym_sec->output_section->vma
- + sym_sec->output_offset;
- if (debug_relax)
- printf ("Checking if the relocation's "
- "addend needs corrections.\n"
- "Address of anchor symbol: 0x%x \n"
- "Address of relocation target: 0x%x \n"
- "Address of relaxed insn: 0x%x \n",
- (unsigned int) symval,
- (unsigned int) (symval + irel->r_addend),
- (unsigned int) shrinked_insn_address);
- if (symval <= shrinked_insn_address
- && (symval + irel->r_addend) > shrinked_insn_address)
- {
- /* If there is an alignment boundary, we only need to
- adjust addends that end up below the boundary. */
- bfd_vma shrink_boundary = (toaddr
- + sec->output_section->vma
- + sec->output_offset);
- if (debug_relax)
- printf
- ("Relocation's addend needed to be fixed \n");
- if (!elf32_ft32_adjust_reloc_if_spans_insn (abfd, isec,
- irel, symval,
- shrinked_insn_address,
- shrink_boundary,
- count))
- return false;
- }
- }
- /* else reference symbol is absolute. No adjustment needed. */
- }
- /* else...Reference symbol is extern. No need for adjusting
- the addend. */
- }
- }
- }
- /* Adjust the local symbols defined in this section. */
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- isym = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (isym)
- {
- for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
- {
- if (isym->st_shndx == sec_shndx
- && isym->st_value > addr && isym->st_value < toaddr)
- isym->st_value -= count;
- }
- }
- /* Now adjust the global symbols defined in this section. */
- symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
- - symtab_hdr->sh_info);
- sym_hashes = start_hashes = elf_sym_hashes (abfd);
- end_hashes = sym_hashes + symcount;
- for (; sym_hashes < end_hashes; sym_hashes++)
- {
- struct elf_link_hash_entry *sym_hash = *sym_hashes;
- /* The '--wrap SYMBOL' option is causing a pain when the object file,
- containing the definition of __wrap_SYMBOL, includes a direct
- call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
- the same symbol (which is __wrap_SYMBOL), but still exist as two
- different symbols in 'sym_hashes', we don't want to adjust
- the global symbol __wrap_SYMBOL twice.
- This check is only relevant when symbols are being wrapped. */
- if (link_info->wrap_hash != NULL)
- {
- struct elf_link_hash_entry **cur_sym_hashes;
- /* Loop only over the symbols whom been already checked. */
- for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
- cur_sym_hashes++)
- /* If the current symbol is identical to 'sym_hash', that means
- the symbol was already adjusted (or at least checked). */
- if (*cur_sym_hashes == sym_hash)
- break;
- /* Don't adjust the symbol again. */
- if (cur_sym_hashes < sym_hashes)
- continue;
- }
- if ((sym_hash->root.type == bfd_link_hash_defined
- || sym_hash->root.type == bfd_link_hash_defweak)
- && sym_hash->root.u.def.section == sec
- && sym_hash->root.u.def.value > addr
- && sym_hash->root.u.def.value < toaddr)
- sym_hash->root.u.def.value -= count;
- }
- return true;
- }
- /* Return TRUE if LOC can be a target of a branch, jump or call. */
- static bool
- elf32_ft32_relax_is_branch_target (struct bfd_link_info *link_info,
- bfd * abfd, asection * sec,
- bfd_vma loc)
- {
- Elf_Internal_Shdr *symtab_hdr;
- Elf_Internal_Rela *irel, *irelend;
- Elf_Internal_Sym *isym;
- Elf_Internal_Sym *isymbuf = NULL;
- bfd_vma symval;
- struct bfd_section *isec;
- struct elf_link_hash_entry **sym_hashes;
- struct elf_link_hash_entry **end_hashes;
- struct elf_link_hash_entry **start_hashes;
- unsigned int symcount;
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- /* Now we check for relocations pointing to ret. */
- for (isec = abfd->sections; isec; isec = isec->next)
- {
- irel = elf_section_data (isec)->relocs;
- if (irel == NULL)
- irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, true);
- irelend = irel + isec->reloc_count;
- for (; irel < irelend; irel++)
- {
- /* Read this BFD's local symbols if we haven't done
- so already. */
- if (isymbuf == NULL && symtab_hdr->sh_info != 0)
- {
- isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (isymbuf == NULL)
- isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
- symtab_hdr->sh_info, 0,
- NULL, NULL, NULL);
- if (isymbuf == NULL)
- return false;
- }
- /* Get the value of the symbol referred to by the reloc. */
- if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
- {
- /* A local symbol. */
- asection *sym_sec;
- isym = isymbuf + ELF32_R_SYM (irel->r_info);
- sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
- symval = isym->st_value;
- /* If the reloc is absolute, it will not have
- a symbol or section associated with it. */
- if (sym_sec == sec)
- {
- symval += sym_sec->output_section->vma
- + sym_sec->output_offset;
- if (debug_relax)
- printf ("0x%x: Address of anchor symbol: 0x%x "
- "Address of relocation target: 0x%x \n",
- (unsigned int) irel->r_offset,
- (unsigned int) symval,
- (unsigned int) (symval + irel->r_addend));
- if ((irel->r_addend) == loc)
- return true;
- }
- }
- }
- }
- symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
- - symtab_hdr->sh_info);
- sym_hashes = start_hashes = elf_sym_hashes (abfd);
- end_hashes = sym_hashes + symcount;
- for (; sym_hashes < end_hashes; sym_hashes++)
- {
- struct elf_link_hash_entry *sym_hash = *sym_hashes;
- /* The '--wrap SYMBOL' option is causing a pain when the object file,
- containing the definition of __wrap_SYMBOL, includes a direct
- call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
- the same symbol (which is __wrap_SYMBOL), but still exist as two
- different symbols in 'sym_hashes', we don't want to adjust
- the global symbol __wrap_SYMBOL twice.
- This check is only relevant when symbols are being wrapped. */
- if (link_info->wrap_hash != NULL)
- {
- struct elf_link_hash_entry **cur_sym_hashes;
- /* Loop only over the symbols whom been already checked. */
- for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
- cur_sym_hashes++)
- /* If the current symbol is identical to 'sym_hash', that means
- the symbol was already adjusted (or at least checked). */
- if (*cur_sym_hashes == sym_hash)
- break;
- /* Don't adjust the symbol again. */
- if (cur_sym_hashes < sym_hashes)
- continue;
- }
- if ((sym_hash->root.type == bfd_link_hash_defined
- || sym_hash->root.type == bfd_link_hash_defweak)
- && sym_hash->root.u.def.section == sec
- && sym_hash->root.u.def.value == loc)
- return true;
- }
- return false;
- }
- static bool
- ft32_elf_relax_section (bfd *abfd,
- asection *sec,
- struct bfd_link_info *link_info,
- bool *again)
- {
- Elf_Internal_Rela * free_relocs = NULL;
- Elf_Internal_Rela * internal_relocs;
- Elf_Internal_Rela * irelend;
- Elf_Internal_Rela * irel;
- bfd_byte * contents = NULL;
- Elf_Internal_Shdr * symtab_hdr;
- Elf_Internal_Sym * isymbuf = NULL;
- /* Assume nothing changes. */
- *again = false;
- /* We don't have to do anything for a relocatable link, if
- this section does not have relocs, or if this is not a
- code section. */
- if (bfd_link_relocatable (link_info)
- || (sec->flags & SEC_RELOC) == 0
- || sec->reloc_count == 0
- || (sec->flags & SEC_CODE) == 0)
- return true;
- /* Get the section contents. */
- if (elf_section_data (sec)->this_hdr.contents != NULL)
- contents = elf_section_data (sec)->this_hdr.contents;
- /* Go get them off disk. */
- else
- {
- if (! bfd_malloc_and_get_section (abfd, sec, &contents))
- goto error_return;
- elf_section_data (sec)->this_hdr.contents = contents;
- }
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- /* Read this BFD's local symbols if we haven't done so already. */
- if (isymbuf == NULL && symtab_hdr->sh_info != 0)
- {
- isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (isymbuf == NULL)
- isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
- symtab_hdr->sh_info, 0,
- NULL, NULL, NULL);
- if (isymbuf == NULL)
- goto error_return;
- symtab_hdr->contents = (unsigned char *) isymbuf;
- }
- internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
- link_info->keep_memory);
- if (internal_relocs == NULL)
- goto error_return;
- if (! link_info->keep_memory)
- free_relocs = internal_relocs;
- /* Walk through them looking for relaxing opportunities. */
- irelend = internal_relocs + sec->reloc_count;
- /* Test every adjacent pair of relocs. If both have shortcodes,
- fuse them and delete the relocs. */
- irel = internal_relocs;
- while (irel < irelend - 1)
- {
- Elf_Internal_Rela * irel_next = irel + 1;
- unsigned int sc0, sc1;
- bfd_vma pc;
- pc = irel->r_offset;
- if (((pc + 4) == (irel_next->r_offset))
- && ft32_reloc_shortable (abfd, sec, isymbuf, contents, pc, irel,
- &sc0)
- && ft32_reloc_shortable (abfd, sec, isymbuf, contents, pc,
- irel_next, &sc1)
- && !elf32_ft32_relax_is_branch_target (link_info, abfd, sec,
- irel_next->r_offset))
- {
- unsigned int code30 = (sc1 << 15) | sc0;
- unsigned int code27 = code30 >> 3;
- unsigned int code3 = code30 & 7;
- static const unsigned char pat3[] = {2, 3, 4, 5, 6, 9, 10, 14};
- unsigned int pattern = pat3[code3];
- unsigned int fused = (pattern << 27) | code27;
- /* Move second reloc to same place as first. */
- irel_next->r_offset = irel->r_offset;
- /* Change both relocs to R_FT32_NONE. */
- if (ELF32_R_TYPE (irel->r_info) == R_FT32_18)
- {
- irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
- R_FT32_SC0);
- }
- else
- {
- irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
- R_FT32_NONE);
- }
- if (ELF32_R_TYPE (irel_next->r_info) == R_FT32_18)
- {
- irel_next->r_info = ELF32_R_INFO (ELF32_R_SYM (irel_next->r_info),
- R_FT32_SC1);
- }
- else
- {
- irel_next->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
- R_FT32_NONE);
- }
- /* Replace the first insn with the fused version. */
- bfd_put_32 (abfd, fused, contents + irel->r_offset);
- /* Delete the second insn. */
- if (!elf32_ft32_relax_delete_bytes (link_info, abfd, sec,
- irel->r_offset + 4, 4))
- goto error_return;
- /* That will change things, so, we should relax again.
- Note that this is not required, and it may be slow. */
- *again = true;
- irel += 2;
- }
- else
- {
- irel += 1;
- }
- }
- if (isymbuf != NULL
- && symtab_hdr->contents != (unsigned char *) isymbuf)
- {
- if (! link_info->keep_memory)
- free (isymbuf);
- else
- /* Cache the symbols for elf_link_input_bfd. */
- symtab_hdr->contents = (unsigned char *) isymbuf;
- }
- if (contents != NULL
- && elf_section_data (sec)->this_hdr.contents != contents)
- {
- if (! link_info->keep_memory)
- free (contents);
- else
- /* Cache the section contents for elf_link_input_bfd. */
- elf_section_data (sec)->this_hdr.contents = contents;
- }
- if (elf_section_data (sec)->relocs != internal_relocs)
- free (internal_relocs);
- return true;
- error_return:
- free (free_relocs);
- return true;
- }
- #define ELF_ARCH bfd_arch_ft32
- #define ELF_MACHINE_CODE EM_FT32
- #define ELF_MAXPAGESIZE 0x1
- #define TARGET_LITTLE_SYM ft32_elf32_vec
- #define TARGET_LITTLE_NAME "elf32-ft32"
- #define elf_info_to_howto_rel NULL
- #define elf_info_to_howto ft32_info_to_howto_rela
- #define elf_backend_relocate_section ft32_elf_relocate_section
- #define elf_backend_can_gc_sections 1
- #define elf_backend_rela_normal 1
- #define bfd_elf32_bfd_reloc_type_lookup ft32_reloc_type_lookup
- #define bfd_elf32_bfd_reloc_name_lookup ft32_reloc_name_lookup
- #define bfd_elf32_bfd_relax_section ft32_elf_relax_section
- #include "elf32-target.h"
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