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- /* M16C/M32C specific support for 32-bit ELF.
- Copyright (C) 2005-2022 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/m32c.h"
- #include "libiberty.h"
- /* Forward declarations. */
- static reloc_howto_type * m32c_reloc_type_lookup
- (bfd *, bfd_reloc_code_real_type);
- static bool m32c_info_to_howto_rela
- (bfd *, arelent *, Elf_Internal_Rela *);
- static int m32c_elf_relocate_section
- (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
- static bool m32c_elf_check_relocs
- (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
- static bool m32c_elf_relax_delete_bytes (bfd *, asection *, bfd_vma, int);
- #ifdef DEBUG
- char * m32c_get_reloc (long reloc);
- void dump_symtab (bfd *, void *, void *);
- #endif
- static bool m32c_elf_relax_section
- (bfd *abfd, asection *sec, struct bfd_link_info *link_info, bool *again);
- static bfd_reloc_status_type m32c_apply_reloc_24
- (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
- static reloc_howto_type m32c_elf_howto_table [] =
- {
- /* This reloc does nothing. */
- HOWTO (R_M32C_NONE, /* type */
- 0, /* rightshift */
- 3, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_M32C_NONE", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- /* GCC intentionally overflows these next two in order to work
- around limitations in the addressing modes, so don't complain
- about overflow. */
- HOWTO (R_M32C_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_M32C_16", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_M32C_24, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 24, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- m32c_apply_reloc_24, /* special_function */
- "R_M32C_24", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_M32C_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_M32C_32", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffffffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_M32C_8_PCREL, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 8, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_M32C_8_PCREL", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_M32C_16_PCREL, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 16, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_M32C_16_PCREL", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_M32C_8, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 8, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_unsigned, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_M32C_8", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_M32C_LO16, /* 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_M32C_LO16", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_M32C_HI8, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 8, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_M32C_HI8", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_M32C_HI16, /* 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_M32C_HI16", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_M32C_RL_JUMP, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_M32C_RL_JUMP", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_M32C_RL_1ADDR, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_M32C_RL_1ADDR", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_M32C_RL_2ADDR, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_M32C_RL_2ADDR", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- };
- /* Map BFD reloc types to M32C ELF reloc types. */
- struct m32c_reloc_map
- {
- bfd_reloc_code_real_type bfd_reloc_val;
- unsigned int m32c_reloc_val;
- };
- static const struct m32c_reloc_map m32c_reloc_map [] =
- {
- { BFD_RELOC_NONE, R_M32C_NONE },
- { BFD_RELOC_16, R_M32C_16 },
- { BFD_RELOC_24, R_M32C_24 },
- { BFD_RELOC_32, R_M32C_32 },
- { BFD_RELOC_8_PCREL, R_M32C_8_PCREL },
- { BFD_RELOC_16_PCREL, R_M32C_16_PCREL },
- { BFD_RELOC_8, R_M32C_8 },
- { BFD_RELOC_LO16, R_M32C_LO16 },
- { BFD_RELOC_HI16, R_M32C_HI16 },
- { BFD_RELOC_M32C_HI8, R_M32C_HI8 },
- { BFD_RELOC_M32C_RL_JUMP, R_M32C_RL_JUMP },
- { BFD_RELOC_M32C_RL_1ADDR, R_M32C_RL_1ADDR },
- { BFD_RELOC_M32C_RL_2ADDR, R_M32C_RL_2ADDR }
- };
- static reloc_howto_type *
- m32c_reloc_type_lookup
- (bfd * abfd ATTRIBUTE_UNUSED,
- bfd_reloc_code_real_type code)
- {
- unsigned int i;
- for (i = ARRAY_SIZE (m32c_reloc_map); i--;)
- if (m32c_reloc_map [i].bfd_reloc_val == code)
- return & m32c_elf_howto_table [m32c_reloc_map[i].m32c_reloc_val];
- return NULL;
- }
- static reloc_howto_type *
- m32c_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
- {
- unsigned int i;
- for (i = 0;
- i < sizeof (m32c_elf_howto_table) / sizeof (m32c_elf_howto_table[0]);
- i++)
- if (m32c_elf_howto_table[i].name != NULL
- && strcasecmp (m32c_elf_howto_table[i].name, r_name) == 0)
- return &m32c_elf_howto_table[i];
- return NULL;
- }
- /* Set the howto pointer for an M32C ELF reloc. */
- static bool
- m32c_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_M32C_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 = & m32c_elf_howto_table [r_type];
- return true;
- }
- /* Apply R_M32C_24 relocations. We have to do this because it's not a
- power-of-two size, and the generic code may think it overruns the
- section if it's right at the end.
- Must return something other than bfd_reloc_continue to avoid the
- above problem. Typical return values include bfd_reloc_ok or
- bfd_reloc_overflow.
- */
- static bfd_reloc_status_type m32c_apply_reloc_24 (bfd *abfd ATTRIBUTE_UNUSED,
- arelent *reloc_entry,
- asymbol *symbol,
- void *vdata_start ATTRIBUTE_UNUSED,
- asection *input_section,
- bfd *ibfd ATTRIBUTE_UNUSED,
- char **error_msg ATTRIBUTE_UNUSED)
- {
- bfd_vma relocation;
- bfd_reloc_status_type s;
- s = bfd_elf_generic_reloc (abfd, reloc_entry, symbol,
- vdata_start,
- input_section, ibfd, error_msg);
- if (s != bfd_reloc_continue)
- return s;
- /* Get symbol value. (Common symbols are special.) */
- if (bfd_is_com_section (symbol->section))
- relocation = 0;
- else
- relocation = symbol->value;
- relocation += symbol->section->output_offset;
- /* Add in supplied addend. */
- relocation += reloc_entry->addend;
- reloc_entry->addend = relocation;
- reloc_entry->address += input_section->output_offset;
- return bfd_reloc_ok;
- }
- /* Relocate an M32C ELF section.
- There is some attempt to make this function usable for many architectures,
- both USE_REL and USE_RELA ['twould be nice if such a critter existed],
- if only to serve as a learning tool.
- 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
- m32c_elf_relocate_section
- (bfd * output_bfd ATTRIBUTE_UNUSED,
- 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;
- asection *splt;
- symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
- sym_hashes = elf_sym_hashes (input_bfd);
- relend = relocs + input_section->reloc_count;
- splt = elf_hash_table (info)->splt;
- 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 = NULL;
- int r_type;
- r_type = ELF32_R_TYPE (rel->r_info);
- /* These are only used for relaxing; we don't actually relocate
- anything with them, so skip them. */
- if (r_type == R_M32C_RL_JUMP
- || r_type == R_M32C_RL_1ADDR
- || r_type == R_M32C_RL_2ADDR)
- continue;
- r_symndx = ELF32_R_SYM (rel->r_info);
- howto = m32c_elf_howto_table + ELF32_R_TYPE (rel->r_info);
- h = NULL;
- sym = NULL;
- sec = NULL;
- relocation = 0;
- if (r_symndx < symtab_hdr->sh_info)
- {
- sym = local_syms + r_symndx;
- sec = local_sections [r_symndx];
- relocation = (sec->output_section->vma
- + sec->output_offset
- + sym->st_value);
- name = bfd_elf_string_from_elf_section
- (input_bfd, symtab_hdr->sh_link, sym->st_name);
- name = sym->st_name == 0 ? bfd_section_name (sec) : name;
- }
- else
- {
- h = sym_hashes [r_symndx - symtab_hdr->sh_info];
- if (info->wrap_hash != NULL
- && (input_section->flags & SEC_DEBUGGING) != 0)
- h = ((struct elf_link_hash_entry *)
- unwrap_hash_lookup (info, input_bfd, &h->root));
- while (h->root.type == bfd_link_hash_indirect
- || h->root.type == bfd_link_hash_warning)
- h = (struct elf_link_hash_entry *) h->root.u.i.link;
- name = h->root.root.string;
- if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- {
- sec = h->root.u.def.section;
- relocation = (h->root.u.def.value
- + sec->output_section->vma
- + sec->output_offset);
- }
- else if (h->root.type == bfd_link_hash_undefweak)
- ;
- else if (!bfd_link_relocatable (info))
- (*info->callbacks->undefined_symbol) (info, h->root.root.string,
- input_bfd, input_section,
- rel->r_offset, true);
- }
- 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))
- {
- /* This is a relocatable link. We don't have to change
- anything, unless the reloc is against a section symbol,
- in which case we have to adjust according to where the
- section symbol winds up in the output section. */
- if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
- rel->r_addend += sec->output_offset;
- continue;
- }
- switch (ELF32_R_TYPE (rel->r_info))
- {
- case R_M32C_16:
- {
- bfd_vma *plt_offset;
- if (h != NULL)
- plt_offset = &h->plt.offset;
- else
- plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
- /* printf("%s: rel %x plt %d\n", h ? h->root.root.string : "(none)",
- relocation, *plt_offset);*/
- if (relocation <= 0xffff)
- {
- /* If the symbol is in range for a 16-bit address, we should
- have deallocated the plt entry in relax_section. */
- BFD_ASSERT (*plt_offset == (bfd_vma) -1);
- }
- else
- {
- /* If the symbol is out of range for a 16-bit address,
- we must have allocated a plt entry. */
- BFD_ASSERT (*plt_offset != (bfd_vma) -1);
- /* If this is the first time we've processed this symbol,
- fill in the plt entry with the correct symbol address. */
- if ((*plt_offset & 1) == 0)
- {
- unsigned int x;
- x = 0x000000fc; /* jmpf */
- x |= (relocation << 8) & 0xffffff00;
- bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
- *plt_offset |= 1;
- }
- relocation = (splt->output_section->vma
- + splt->output_offset
- + (*plt_offset & -2));
- if (name)
- {
- char *newname = bfd_malloc (strlen(name)+5);
- strcpy (newname, name);
- strcat(newname, ".plt");
- _bfd_generic_link_add_one_symbol (info,
- input_bfd,
- newname,
- BSF_FUNCTION | BSF_WEAK,
- splt,
- (*plt_offset & -2),
- 0,
- 1,
- 0,
- 0);
- }
- }
- }
- break;
- case R_M32C_HI8:
- case R_M32C_HI16:
- relocation >>= 16;
- break;
- }
- #if 0
- printf ("relocate %s at %06lx relocation %06lx addend %ld ",
- m32c_elf_howto_table[ELF32_R_TYPE(rel->r_info)].name,
- rel->r_offset + input_section->output_section->vma + input_section->output_offset,
- relocation, rel->r_addend);
- {
- int i;
- for (i=0; i<4; i++)
- printf (" %02x", contents[rel->r_offset+i]);
- printf ("\n");
- }
- #endif
- switch (ELF32_R_TYPE(rel->r_info))
- {
- case R_M32C_24:
- /* Like m32c_apply_reloc_24, we must handle this one separately. */
- relocation += rel->r_addend;
- /* Sanity check the address. */
- if (rel->r_offset + 3
- > bfd_get_section_limit_octets (input_bfd, input_section))
- r = bfd_reloc_outofrange;
- else
- {
- bfd_put_8 (input_bfd, relocation & 0xff, contents + rel->r_offset);
- bfd_put_8 (input_bfd, (relocation >> 8) & 0xff, contents + rel->r_offset + 1);
- bfd_put_8 (input_bfd, (relocation >> 16) & 0xff, contents + rel->r_offset + 2);
- 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 = (const char *) 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;
- }
- /* We support 16-bit pointers to code above 64k by generating a thunk
- below 64k containing a JMP instruction to the final address. */
- static bool
- m32c_elf_check_relocs
- (bfd * abfd,
- struct bfd_link_info * info,
- asection * sec,
- const Elf_Internal_Rela * relocs)
- {
- Elf_Internal_Shdr * symtab_hdr;
- struct elf_link_hash_entry ** sym_hashes;
- const Elf_Internal_Rela * rel;
- const Elf_Internal_Rela * rel_end;
- bfd_vma *local_plt_offsets;
- asection *splt;
- bfd *dynobj;
- if (bfd_link_relocatable (info))
- return true;
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- sym_hashes = elf_sym_hashes (abfd);
- local_plt_offsets = elf_local_got_offsets (abfd);
- splt = NULL;
- dynobj = elf_hash_table(info)->dynobj;
- rel_end = relocs + sec->reloc_count;
- for (rel = relocs; rel < rel_end; rel++)
- {
- struct elf_link_hash_entry *h;
- unsigned long r_symndx;
- bfd_vma *offset;
- r_symndx = ELF32_R_SYM (rel->r_info);
- if (r_symndx < symtab_hdr->sh_info)
- h = NULL;
- else
- {
- h = sym_hashes[r_symndx - symtab_hdr->sh_info];
- while (h->root.type == bfd_link_hash_indirect
- || h->root.type == bfd_link_hash_warning)
- h = (struct elf_link_hash_entry *) h->root.u.i.link;
- }
- switch (ELF32_R_TYPE (rel->r_info))
- {
- /* This relocation describes a 16-bit pointer to a function.
- We may need to allocate a thunk in low memory; reserve memory
- for it now. */
- case R_M32C_16:
- if (dynobj == NULL)
- elf_hash_table (info)->dynobj = dynobj = abfd;
- splt = elf_hash_table (info)->splt;
- if (splt == NULL)
- {
- flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
- | SEC_IN_MEMORY | SEC_LINKER_CREATED
- | SEC_READONLY | SEC_CODE);
- splt = bfd_make_section_anyway_with_flags (dynobj, ".plt",
- flags);
- elf_hash_table (info)->splt = splt;
- if (splt == NULL
- || !bfd_set_section_alignment (splt, 1))
- return false;
- }
- if (h != NULL)
- offset = &h->plt.offset;
- else
- {
- if (local_plt_offsets == NULL)
- {
- size_t size;
- unsigned int i;
- size = symtab_hdr->sh_info * sizeof (bfd_vma);
- local_plt_offsets = (bfd_vma *) bfd_alloc (abfd, size);
- if (local_plt_offsets == NULL)
- return false;
- elf_local_got_offsets (abfd) = local_plt_offsets;
- for (i = 0; i < symtab_hdr->sh_info; i++)
- local_plt_offsets[i] = (bfd_vma) -1;
- }
- offset = &local_plt_offsets[r_symndx];
- }
- if (*offset == (bfd_vma) -1)
- {
- *offset = splt->size;
- splt->size += 4;
- }
- break;
- }
- }
- return true;
- }
- /* This must exist if dynobj is ever set. */
- static bool
- m32c_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED,
- struct bfd_link_info *info)
- {
- bfd *dynobj = elf_hash_table (info)->dynobj;
- asection *splt = elf_hash_table (info)->splt;
- /* As an extra sanity check, verify that all plt entries have
- been filled in. */
- if (dynobj != NULL && splt != NULL)
- {
- bfd_byte *contents = splt->contents;
- unsigned int i, size = splt->size;
- for (i = 0; i < size; i += 4)
- {
- unsigned int x = bfd_get_32 (dynobj, contents + i);
- BFD_ASSERT (x != 0);
- }
- }
- return true;
- }
- static bool
- m32c_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
- struct bfd_link_info *info)
- {
- bfd *dynobj;
- asection *splt;
- if (bfd_link_relocatable (info))
- return true;
- dynobj = elf_hash_table (info)->dynobj;
- if (dynobj == NULL)
- return true;
- splt = elf_hash_table (info)->splt;
- BFD_ASSERT (splt != NULL);
- splt->contents = (bfd_byte *) bfd_zalloc (dynobj, splt->size);
- if (splt->contents == NULL)
- return false;
- return true;
- }
- /* Function to set the ELF flag bits. */
- static bool
- m32c_elf_set_private_flags (bfd *abfd, flagword flags)
- {
- elf_elfheader (abfd)->e_flags = flags;
- elf_flags_init (abfd) = true;
- return true;
- }
- /* Merge backend specific data from an object file to the output
- object file when linking. */
- static bool
- m32c_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
- {
- bfd *obfd = info->output_bfd;
- flagword old_flags, old_partial;
- flagword new_flags, new_partial;
- bool error = false;
- char new_opt[80];
- char old_opt[80];
- new_opt[0] = old_opt[0] = '\0';
- new_flags = elf_elfheader (ibfd)->e_flags;
- old_flags = elf_elfheader (obfd)->e_flags;
- #ifdef DEBUG
- _bfd_error_handler
- ("old_flags = 0x%.8x, new_flags = 0x%.8x, init = %s, filename = %s",
- old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no",
- bfd_get_filename (ibfd));
- #endif
- if (!elf_flags_init (obfd))
- {
- /* First call, no flags set. */
- elf_flags_init (obfd) = true;
- elf_elfheader (obfd)->e_flags = new_flags;
- }
- else if (new_flags == old_flags)
- /* Compatible flags are ok. */
- ;
- else /* Possibly incompatible flags. */
- {
- /* Warn if different cpu is used (allow a specific cpu to override
- the generic cpu). */
- new_partial = (new_flags & EF_M32C_CPU_MASK);
- old_partial = (old_flags & EF_M32C_CPU_MASK);
- if (new_partial == old_partial)
- ;
- else
- {
- switch (new_partial)
- {
- default: strcat (new_opt, " -m16c"); break;
- case EF_M32C_CPU_M16C: strcat (new_opt, " -m16c"); break;
- case EF_M32C_CPU_M32C: strcat (new_opt, " -m32c"); break;
- }
- switch (old_partial)
- {
- default: strcat (old_opt, " -m16c"); break;
- case EF_M32C_CPU_M16C: strcat (old_opt, " -m16c"); break;
- case EF_M32C_CPU_M32C: strcat (old_opt, " -m32c"); break;
- }
- }
- /* Print out any mismatches from above. */
- if (new_opt[0])
- {
- error = true;
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: compiled with %s and linked with modules compiled with %s"),
- ibfd, new_opt, old_opt);
- }
- new_flags &= ~ EF_M32C_ALL_FLAGS;
- old_flags &= ~ EF_M32C_ALL_FLAGS;
- /* Warn about any other mismatches. */
- if (new_flags != old_flags)
- {
- error = true;
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: uses different e_flags (%#x) fields"
- " than previous modules (%#x)"),
- ibfd, new_flags, old_flags);
- }
- }
- if (error)
- bfd_set_error (bfd_error_bad_value);
- return !error;
- }
- static bool
- m32c_elf_print_private_bfd_data (bfd *abfd, void *ptr)
- {
- FILE *file = (FILE *) ptr;
- flagword flags;
- BFD_ASSERT (abfd != NULL && ptr != NULL);
- /* Print normal ELF private data. */
- _bfd_elf_print_private_bfd_data (abfd, ptr);
- flags = elf_elfheader (abfd)->e_flags;
- fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags);
- switch (flags & EF_M32C_CPU_MASK)
- {
- default: break;
- case EF_M32C_CPU_M16C: fprintf (file, " -m16c"); break;
- case EF_M32C_CPU_M32C: fprintf (file, " -m32c"); break;
- }
- fputc ('\n', file);
- return true;
- }
- /* Return the MACH for an e_flags value. */
- static int
- elf32_m32c_machine (bfd *abfd)
- {
- switch (elf_elfheader (abfd)->e_flags & EF_M32C_CPU_MASK)
- {
- case EF_M32C_CPU_M16C: return bfd_mach_m16c;
- case EF_M32C_CPU_M32C: return bfd_mach_m32c;
- }
- return bfd_mach_m16c;
- }
- static bool
- m32c_elf_object_p (bfd *abfd)
- {
- bfd_default_set_arch_mach (abfd, bfd_arch_m32c,
- elf32_m32c_machine (abfd));
- return true;
- }
-
- #ifdef DEBUG
- void
- dump_symtab (bfd * abfd, void *internal_syms, void *external_syms)
- {
- size_t locsymcount;
- Elf_Internal_Sym *isymbuf;
- Elf_Internal_Sym *isymend;
- Elf_Internal_Sym *isym;
- Elf_Internal_Shdr *symtab_hdr;
- bool free_internal = 0, free_external = 0;
- char * st_info_str;
- char * st_info_stb_str;
- char * st_other_str;
- char * st_shndx_str;
- if (! internal_syms)
- {
- internal_syms = bfd_malloc (1000);
- free_internal = 1;
- }
- if (! external_syms)
- {
- external_syms = bfd_malloc (1000);
- free_external = 1;
- }
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- locsymcount = symtab_hdr->sh_size / get_elf_backend_data(abfd)->s->sizeof_sym;
- if (free_internal)
- isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
- symtab_hdr->sh_info, 0,
- internal_syms, external_syms, NULL);
- else
- isymbuf = internal_syms;
- isymend = isymbuf + locsymcount;
- for (isym = isymbuf ; isym < isymend ; isym++)
- {
- switch (ELF_ST_TYPE (isym->st_info))
- {
- case STT_FUNC:
- st_info_str = "STT_FUNC";
- break;
- case STT_SECTION:
- st_info_str = "STT_SECTION";
- break;
- case STT_FILE:
- st_info_str = "STT_FILE";
- break;
- case STT_OBJECT:
- st_info_str = "STT_OBJECT";
- break;
- case STT_TLS:
- st_info_str = "STT_TLS";
- break;
- default:
- st_info_str = "";
- }
- switch (ELF_ST_BIND (isym->st_info))
- {
- case STB_LOCAL:
- st_info_stb_str = "STB_LOCAL";
- break;
- case STB_GLOBAL:
- st_info_stb_str = "STB_GLOBAL";
- break;
- default:
- st_info_stb_str = "";
- }
- switch (ELF_ST_VISIBILITY (isym->st_other))
- {
- case STV_DEFAULT:
- st_other_str = "STV_DEFAULT";
- break;
- case STV_INTERNAL:
- st_other_str = "STV_INTERNAL";
- break;
- case STV_PROTECTED:
- st_other_str = "STV_PROTECTED";
- break;
- default:
- st_other_str = "";
- }
- switch (isym->st_shndx)
- {
- case SHN_ABS:
- st_shndx_str = "SHN_ABS";
- break;
- case SHN_COMMON:
- st_shndx_str = "SHN_COMMON";
- break;
- case SHN_UNDEF:
- st_shndx_str = "SHN_UNDEF";
- break;
- default:
- st_shndx_str = "";
- }
- printf ("isym = %p st_value = %lx st_size = %lx st_name = (%lu) %s "
- "st_info = (%d) %s %s st_other = (%d) %s st_shndx = (%d) %s\n",
- isym,
- (unsigned long) isym->st_value,
- (unsigned long) isym->st_size,
- isym->st_name,
- bfd_elf_string_from_elf_section (abfd, symtab_hdr->sh_link,
- isym->st_name),
- isym->st_info, st_info_str, st_info_stb_str,
- isym->st_other, st_other_str,
- isym->st_shndx, st_shndx_str);
- }
- if (free_internal)
- free (internal_syms);
- if (free_external)
- free (external_syms);
- }
- char *
- m32c_get_reloc (long reloc)
- {
- if (0 <= reloc && reloc < R_M32C_max)
- return m32c_elf_howto_table[reloc].name;
- else
- return "";
- }
- #endif /* DEBUG */
- /* Handle relaxing. */
- /* A subroutine of m32c_elf_relax_section. If the global symbol H
- is within the low 64k, remove any entry for it in the plt. */
- struct relax_plt_data
- {
- asection *splt;
- bool *again;
- };
- static bool
- m32c_relax_plt_check (struct elf_link_hash_entry *h, void * xdata)
- {
- struct relax_plt_data *data = (struct relax_plt_data *) xdata;
- if (h->plt.offset != (bfd_vma) -1)
- {
- bfd_vma address;
- if (h->root.type == bfd_link_hash_undefined
- || h->root.type == bfd_link_hash_undefweak)
- address = 0;
- else
- address = (h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset
- + h->root.u.def.value);
- if (address <= 0xffff)
- {
- h->plt.offset = -1;
- data->splt->size -= 4;
- *data->again = true;
- }
- }
- return true;
- }
- /* A subroutine of m32c_elf_relax_section. If the global symbol H
- previously had a plt entry, give it a new entry offset. */
- static bool
- m32c_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata)
- {
- bfd_vma *entry = (bfd_vma *) xdata;
- if (h->plt.offset != (bfd_vma) -1)
- {
- h->plt.offset = *entry;
- *entry += 4;
- }
- return true;
- }
- static bool
- m32c_elf_relax_plt_section (asection *splt,
- struct bfd_link_info *info,
- bool *again)
- {
- struct relax_plt_data relax_plt_data;
- bfd *ibfd;
- /* Assume nothing changes. */
- *again = false;
- if (bfd_link_relocatable (info))
- return true;
- /* Quick check for an empty plt. */
- if (splt->size == 0)
- return true;
- /* Map across all global symbols; see which ones happen to
- fall in the low 64k. */
- relax_plt_data.splt = splt;
- relax_plt_data.again = again;
- elf_link_hash_traverse (elf_hash_table (info), m32c_relax_plt_check,
- &relax_plt_data);
- /* Likewise for local symbols, though that's somewhat less convenient
- as we have to walk the list of input bfds and swap in symbol data. */
- for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link.next)
- {
- bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
- Elf_Internal_Shdr *symtab_hdr;
- Elf_Internal_Sym *isymbuf = NULL;
- unsigned int idx;
- if (! local_plt_offsets)
- continue;
- symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
- if (symtab_hdr->sh_info != 0)
- {
- isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (isymbuf == NULL)
- isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
- symtab_hdr->sh_info, 0,
- NULL, NULL, NULL);
- if (isymbuf == NULL)
- return false;
- }
- for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
- {
- Elf_Internal_Sym *isym;
- asection *tsec;
- bfd_vma address;
- if (local_plt_offsets[idx] == (bfd_vma) -1)
- continue;
- isym = &isymbuf[idx];
- if (isym->st_shndx == SHN_UNDEF)
- continue;
- else if (isym->st_shndx == SHN_ABS)
- tsec = bfd_abs_section_ptr;
- else if (isym->st_shndx == SHN_COMMON)
- tsec = bfd_com_section_ptr;
- else
- tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
- address = (tsec->output_section->vma
- + tsec->output_offset
- + isym->st_value);
- if (address <= 0xffff)
- {
- local_plt_offsets[idx] = -1;
- splt->size -= 4;
- *again = true;
- }
- }
- if (isymbuf != NULL
- && symtab_hdr->contents != (unsigned char *) isymbuf)
- {
- if (! info->keep_memory)
- free (isymbuf);
- else
- {
- /* Cache the symbols for elf_link_input_bfd. */
- symtab_hdr->contents = (unsigned char *) isymbuf;
- }
- }
- }
- /* If we changed anything, walk the symbols again to reallocate
- .plt entry addresses. */
- if (*again && splt->size > 0)
- {
- bfd_vma entry = 0;
- elf_link_hash_traverse (elf_hash_table (info),
- m32c_relax_plt_realloc, &entry);
- for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link.next)
- {
- bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
- unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
- unsigned int idx;
- if (! local_plt_offsets)
- continue;
- for (idx = 0; idx < nlocals; ++idx)
- if (local_plt_offsets[idx] != (bfd_vma) -1)
- {
- local_plt_offsets[idx] = entry;
- entry += 4;
- }
- }
- }
- return true;
- }
- static int
- compare_reloc (const void *e1, const void *e2)
- {
- const Elf_Internal_Rela *i1 = (const Elf_Internal_Rela *) e1;
- const Elf_Internal_Rela *i2 = (const Elf_Internal_Rela *) e2;
- if (i1->r_offset == i2->r_offset)
- return 0;
- else
- return i1->r_offset < i2->r_offset ? -1 : 1;
- }
- #define OFFSET_FOR_RELOC(rel) m32c_offset_for_reloc (abfd, rel, symtab_hdr, shndx_buf, intsyms)
- static bfd_vma
- m32c_offset_for_reloc (bfd *abfd,
- Elf_Internal_Rela *rel,
- Elf_Internal_Shdr *symtab_hdr,
- bfd_byte *shndx_buf ATTRIBUTE_UNUSED,
- Elf_Internal_Sym *intsyms)
- {
- bfd_vma symval;
- /* Get the value of the symbol referred to by the reloc. */
- if (ELF32_R_SYM (rel->r_info) < symtab_hdr->sh_info)
- {
- /* A local symbol. */
- Elf_Internal_Sym *isym;
- asection *ssec;
- isym = intsyms + ELF32_R_SYM (rel->r_info);
- ssec = bfd_section_from_elf_index (abfd, isym->st_shndx);
- symval = isym->st_value;
- if (ssec)
- symval += ssec->output_section->vma
- + ssec->output_offset;
- }
- else
- {
- unsigned long indx;
- struct elf_link_hash_entry *h;
- /* An external symbol. */
- indx = ELF32_R_SYM (rel->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 0;
- symval = (h->root.u.def.value
- + h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset);
- }
- return symval;
- }
- static int bytes_saved = 0;
- static int bytes_to_reloc[] = {
- R_M32C_NONE,
- R_M32C_8,
- R_M32C_16,
- R_M32C_24,
- R_M32C_32
- };
- /* What we use the bits in a relax reloc addend (R_M32C_RL_*) for. */
- /* Mask for the number of relocs associated with this insn. */
- #define RLA_RELOCS 0x0000000f
- /* Number of bytes gas emitted (before gas's relaxing) */
- #define RLA_NBYTES 0x00000ff0
- /* If the displacement is within the given range and the new encoding
- differs from the old encoding (the index), then the insn can be
- relaxed to the new encoding. */
- typedef const struct {
- int bytes;
- unsigned int max_disp;
- unsigned char new_encoding;
- } EncodingTable;
- static EncodingTable m16c_addr_encodings[] = {
- { 0, 0, 0 }, /* R0 */
- { 0, 0, 1 }, /* R1 */
- { 0, 0, 2 }, /* R2 */
- { 0, 0, 3 }, /* R3 */
- { 0, 0, 4 }, /* A0 */
- { 0, 0, 5 }, /* A1 */
- { 0, 0, 6 }, /* [A0] */
- { 0, 0, 7 }, /* [A1] */
- { 1, 0, 6 }, /* udsp:8[A0] */
- { 1, 0, 7 }, /* udsp:8[A1] */
- { 1, 0, 10 }, /* udsp:8[SB] */
- { 1, 0, 11 }, /* sdsp:8[FB] */
- { 2, 255, 8 }, /* udsp:16[A0] */
- { 2, 255, 9 }, /* udsp:16[A1] */
- { 2, 255, 10 }, /* udsp:16[SB] */
- { 2, 0, 15 }, /* abs:16 */
- };
- static EncodingTable m16c_jmpaddr_encodings[] = {
- { 0, 0, 0 }, /* R0 */
- { 0, 0, 1 }, /* R1 */
- { 0, 0, 2 }, /* R2 */
- { 0, 0, 3 }, /* R3 */
- { 0, 0, 4 }, /* A0 */
- { 0, 0, 5 }, /* A1 */
- { 0, 0, 6 }, /* [A0] */
- { 0, 0, 7 }, /* [A1] */
- { 1, 0, 6 }, /* udsp:8[A0] */
- { 1, 0, 7 }, /* udsp:8[A1] */
- { 1, 0, 10 }, /* udsp:8[SB] */
- { 1, 0, 11 }, /* sdsp:8[FB] */
- { 3, 255, 8 }, /* udsp:20[A0] */
- { 3, 255, 9 }, /* udsp:20[A1] */
- { 2, 255, 10 }, /* udsp:16[SB] */
- { 2, 0, 15 }, /* abs:16 */
- };
- static EncodingTable m32c_addr_encodings[] = {
- { 0, 0, 0 }, /* [A0] */
- { 0, 0, 1 }, /* [A1] */
- { 0, 0, 2 }, /* A0 */
- { 0, 0, 3 }, /* A1 */
- { 1, 0, 0 }, /* udsp:8[A0] */
- { 1, 0, 1 }, /* udsp:8[A1] */
- { 1, 0, 6 }, /* udsp:8[SB] */
- { 1, 0, 7 }, /* sdsp:8[FB] */
- { 2, 255, 4 }, /* udsp:16[A0] */
- { 2, 255, 5 }, /* udsp:16[A1] */
- { 2, 255, 6 }, /* udsp:16[SB] */
- { 2, 127, 7 }, /* sdsp:16[FB] */
- { 3, 65535, 8 }, /* udsp:24[A0] */
- { 3, 65535, 9 }, /* udsp:24[A1] */
- { 3, 65535, 15 }, /* abs24 */
- { 2, 0, 15 }, /* abs16 */
- { 0, 0, 16 }, /* R2 */
- { 0, 0, 17 }, /* R3 */
- { 0, 0, 18 }, /* R0 */
- { 0, 0, 19 }, /* R1 */
- { 0, 0, 20 }, /* */
- { 0, 0, 21 }, /* */
- { 0, 0, 22 }, /* */
- { 0, 0, 23 }, /* */
- { 0, 0, 24 }, /* */
- { 0, 0, 25 }, /* */
- { 0, 0, 26 }, /* */
- { 0, 0, 27 }, /* */
- { 0, 0, 28 }, /* */
- { 0, 0, 29 }, /* */
- { 0, 0, 30 }, /* */
- { 0, 0, 31 }, /* */
- };
- static bool
- m32c_elf_relax_section (bfd *abfd,
- asection *sec,
- struct bfd_link_info *link_info,
- bool *again)
- {
- Elf_Internal_Shdr *symtab_hdr;
- Elf_Internal_Shdr *shndx_hdr;
- Elf_Internal_Rela *internal_relocs;
- Elf_Internal_Rela *free_relocs = NULL;
- Elf_Internal_Rela *irel, *irelend, *srel;
- bfd_byte * contents = NULL;
- bfd_byte * free_contents = NULL;
- Elf_Internal_Sym *intsyms = NULL;
- Elf_Internal_Sym *free_intsyms = NULL;
- bfd_byte *shndx_buf = NULL;
- int machine;
- if (is_elf_hash_table (link_info->hash)
- && abfd == elf_hash_table (link_info)->dynobj
- && (sec->flags & SEC_LINKER_CREATED) != 0
- && strcmp (sec->name, ".plt") == 0)
- return m32c_elf_relax_plt_section (sec, link_info, again);
- /* Assume nothing changes. */
- *again = false;
- machine = elf32_m32c_machine (abfd);
- /* 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;
- symtab_hdr = & elf_symtab_hdr (abfd);
- if (elf_symtab_shndx_list (abfd))
- shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr;
- else
- shndx_hdr = NULL;
- /* 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;
- /* Read this BFD's symbols. */
- /* Get cached copy if it exists. */
- if (symtab_hdr->contents != NULL)
- {
- intsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
- }
- else
- {
- intsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL);
- symtab_hdr->contents = (bfd_byte *) intsyms;
- }
- if (shndx_hdr && shndx_hdr->sh_size != 0)
- {
- size_t amt;
- if (_bfd_mul_overflow (symtab_hdr->sh_info,
- sizeof (Elf_External_Sym_Shndx), &amt))
- {
- bfd_set_error (bfd_error_file_too_big);
- goto error_return;
- }
- if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0)
- goto error_return;
- shndx_buf = _bfd_malloc_and_read (abfd, amt, amt);
- if (shndx_buf == NULL)
- goto error_return;
- shndx_hdr->contents = shndx_buf;
- }
- /* Get a copy of the native relocations. */
- internal_relocs = (_bfd_elf_link_read_relocs
- (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
- link_info->keep_memory));
- if (internal_relocs == NULL)
- goto error_return;
- if (! link_info->keep_memory)
- free_relocs = internal_relocs;
- /* The RL_ relocs must be just before the operand relocs they go
- with, so we must sort them to guarantee this. */
- qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
- compare_reloc);
- /* Walk through them looking for relaxing opportunities. */
- irelend = internal_relocs + sec->reloc_count;
- for (irel = internal_relocs; irel < irelend; irel++)
- {
- bfd_vma symval;
- unsigned char *insn, *gap, *einsn;
- bfd_vma pc;
- bfd_signed_vma pcrel;
- int relax_relocs;
- int gap_size;
- int new_type;
- int posn;
- int enc;
- EncodingTable *enctbl;
- EncodingTable *e;
- if (ELF32_R_TYPE(irel->r_info) != R_M32C_RL_JUMP
- && ELF32_R_TYPE(irel->r_info) != R_M32C_RL_1ADDR
- && ELF32_R_TYPE(irel->r_info) != R_M32C_RL_2ADDR)
- continue;
- srel = irel;
- /* There will always be room for the relaxed insn, since it is smaller
- than the one it would replace. */
- BFD_ASSERT (irel->r_offset < sec->size);
- insn = contents + irel->r_offset;
- relax_relocs = irel->r_addend % 16;
- /* Ok, we only have three relocs we care about, and they're all
- fake. The lower four bits of the addend is always the number
- of following relocs (hence the qsort above) that are assigned
- to this opcode. The next 8 bits of the addend indicates the
- number of bytes in the insn. We use the rest of them
- ourselves as flags for the more expensive operations (defines
- above). The three relocs are:
- RL_JUMP: This marks all direct jump insns. We check the
- displacement and replace them with shorter jumps if
- they're in range. We also use this to find JMP.S
- insns and manually shorten them when we delete bytes.
- We have to decode these insns to figure out what to
- do.
- RL_1ADDR: This is a :G or :Q insn, which has a single
- "standard" operand. We have to extract the type
- field, see if it's a wide displacement, then figure
- out if we can replace it with a narrow displacement.
- We don't have to decode these insns.
- RL_2ADDR: Similarly, but two "standard" operands. Note that
- r_addend may still be 1, as standard operands don't
- always have displacements. Gas shouldn't give us one
- with zero operands, but since we don't know which one
- has the displacement, we check them both anyway.
- These all point to the beginning of the insn itself, not the
- operands.
- Note that we only relax one step at a time, relying on the
- linker to call us repeatedly. Thus, there is no code for
- JMP.A->JMP.B although that will happen in two steps.
- Likewise, for 2ADDR relaxes, we do one operand per cycle.
- */
- /* Get the value of the symbol referred to by the reloc. Just
- in case this is the last reloc in the list, use the RL's
- addend to choose between this reloc (no addend) or the next
- (yes addend, which means at least one following reloc). */
- srel = irel + (relax_relocs ? 1 : 0);
- symval = OFFSET_FOR_RELOC (srel);
- /* Setting gap_size nonzero is the flag which means "something
- shrunk". */
- gap_size = 0;
- gap = NULL;
- new_type = ELF32_R_TYPE(srel->r_info);
- pc = sec->output_section->vma + sec->output_offset
- + srel->r_offset;
- pcrel = symval - pc + srel->r_addend;
- if (machine == bfd_mach_m16c)
- {
- /* R8C / M16C */
- switch (ELF32_R_TYPE(irel->r_info))
- {
- case R_M32C_RL_JUMP:
- switch (insn[0])
- {
- case 0xfe: /* jmp.b */
- if (pcrel >= 2 && pcrel <= 9)
- {
- /* Relax JMP.B -> JMP.S. We need to get rid of
- the following reloc though. */
- insn[0] = 0x60 | (pcrel - 2);
- new_type = R_M32C_NONE;
- irel->r_addend = 0x10;
- gap_size = 1;
- gap = insn + 1;
- }
- break;
- case 0xf4: /* jmp.w */
- /* 128 is allowed because it will be one byte closer
- after relaxing. Likewise for all other pc-rel
- jumps. */
- if (pcrel <= 128 && pcrel >= -128)
- {
- /* Relax JMP.W -> JMP.B */
- insn[0] = 0xfe;
- insn[1] = 0;
- new_type = R_M32C_8_PCREL;
- gap_size = 1;
- gap = insn + 2;
- }
- break;
- case 0xfc: /* jmp.a */
- if (pcrel <= 32768 && pcrel >= -32768)
- {
- /* Relax JMP.A -> JMP.W */
- insn[0] = 0xf4;
- insn[1] = 0;
- insn[2] = 0;
- new_type = R_M32C_16_PCREL;
- gap_size = 1;
- gap = insn + 3;
- }
- break;
- case 0xfd: /* jsr.a */
- if (pcrel <= 32768 && pcrel >= -32768)
- {
- /* Relax JSR.A -> JSR.W */
- insn[0] = 0xf5;
- insn[1] = 0;
- insn[2] = 0;
- new_type = R_M32C_16_PCREL;
- gap_size = 1;
- gap = insn + 3;
- }
- break;
- }
- break;
- case R_M32C_RL_2ADDR:
- /* xxxx xxxx srce dest [src-disp] [dest-disp]*/
- enctbl = m16c_addr_encodings;
- posn = 2;
- enc = (insn[1] >> 4) & 0x0f;
- e = & enctbl[enc];
- if (srel->r_offset == irel->r_offset + posn
- && e->new_encoding != enc
- && symval <= e->max_disp)
- {
- insn[1] &= 0x0f;
- insn[1] |= e->new_encoding << 4;
- gap_size = e->bytes - enctbl[e->new_encoding].bytes;
- gap = insn + posn + enctbl[e->new_encoding].bytes;
- new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes];
- break;
- }
- if (relax_relocs == 2)
- srel ++;
- posn += e->bytes;
- goto try_1addr_16;
- case R_M32C_RL_1ADDR:
- /* xxxx xxxx xxxx dest [disp] */
- enctbl = m16c_addr_encodings;
- posn = 2;
- /* Check the opcode for jumps. We know it's safe to
- do this because all 2ADDR insns are at least two
- bytes long. */
- enc = insn[0] * 256 + insn[1];
- enc &= 0xfff0;
- if (enc == 0x7d20
- || enc == 0x7d00
- || enc == 0x7d30
- || enc == 0x7d10)
- {
- enctbl = m16c_jmpaddr_encodings;
- }
- try_1addr_16:
- /* srel, posn, and enc must be set here. */
- symval = OFFSET_FOR_RELOC (srel);
- enc = insn[1] & 0x0f;
- e = & enctbl[enc];
- if (srel->r_offset == irel->r_offset + posn
- && e->new_encoding != enc
- && symval <= e->max_disp)
- {
- insn[1] &= 0xf0;
- insn[1] |= e->new_encoding;
- gap_size = e->bytes - enctbl[e->new_encoding].bytes;
- gap = insn + posn + enctbl[e->new_encoding].bytes;
- new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes];
- break;
- }
- break;
- } /* Ends switch (reloc type) for m16c. */
- }
- else /* machine == bfd_mach_m32c */
- {
- /* M32CM / M32C */
- switch (ELF32_R_TYPE(irel->r_info))
- {
- case R_M32C_RL_JUMP:
- switch (insn[0])
- {
- case 0xbb: /* jmp.b */
- if (pcrel >= 2 && pcrel <= 9)
- {
- int p = pcrel - 2;
- /* Relax JMP.B -> JMP.S. We need to get rid of
- the following reloc though. */
- insn[0] = 0x4a | ((p << 3) & 0x30) | (p & 1);
- new_type = R_M32C_NONE;
- irel->r_addend = 0x10;
- gap_size = 1;
- gap = insn + 1;
- }
- break;
- case 0xce: /* jmp.w */
- if (pcrel <= 128 && pcrel >= -128)
- {
- /* Relax JMP.W -> JMP.B */
- insn[0] = 0xbb;
- insn[1] = 0;
- new_type = R_M32C_8_PCREL;
- gap_size = 1;
- gap = insn + 2;
- }
- break;
- case 0xcc: /* jmp.a */
- if (pcrel <= 32768 && pcrel >= -32768)
- {
- /* Relax JMP.A -> JMP.W */
- insn[0] = 0xce;
- insn[1] = 0;
- insn[2] = 0;
- new_type = R_M32C_16_PCREL;
- gap_size = 1;
- gap = insn + 3;
- }
- break;
- case 0xcd: /* jsr.a */
- if (pcrel <= 32768 && pcrel >= -32768)
- {
- /* Relax JSR.A -> JSR.W */
- insn[0] = 0xcf;
- insn[1] = 0;
- insn[2] = 0;
- new_type = R_M32C_16_PCREL;
- gap_size = 1;
- gap = insn + 3;
- }
- break;
- }
- break;
- case R_M32C_RL_2ADDR:
- /* xSSS DDDx DDSS xxxx [src-disp] [dest-disp]*/
- einsn = insn;
- posn = 2;
- if (einsn[0] == 1)
- {
- /* prefix; remove it as far as the RL reloc is concerned. */
- einsn ++;
- posn ++;
- }
- enctbl = m32c_addr_encodings;
- enc = ((einsn[0] & 0x70) >> 2) | ((einsn[1] & 0x30) >> 4);
- e = & enctbl[enc];
- if (srel->r_offset == irel->r_offset + posn
- && e->new_encoding != enc
- && symval <= e->max_disp)
- {
- einsn[0] &= 0x8f;
- einsn[0] |= (e->new_encoding & 0x1c) << 2;
- einsn[1] &= 0xcf;
- einsn[1] |= (e->new_encoding & 0x03) << 4;
- gap_size = e->bytes - enctbl[e->new_encoding].bytes;
- gap = insn + posn + enctbl[e->new_encoding].bytes;
- new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes];
- break;
- }
- if (relax_relocs == 2)
- srel ++;
- posn += e->bytes;
- goto try_1addr_32;
- case R_M32C_RL_1ADDR:
- /* xxxx DDDx DDxx xxxx [disp] */
- einsn = insn;
- posn = 2;
- if (einsn[0] == 1)
- {
- /* prefix; remove it as far as the RL reloc is concerned. */
- einsn ++;
- posn ++;
- }
- enctbl = m32c_addr_encodings;
- try_1addr_32:
- /* srel, posn, and enc must be set here. */
- symval = OFFSET_FOR_RELOC (srel);
- enc = ((einsn[0] & 0x0e) << 1) | ((einsn[1] & 0xc0) >> 6);
- e = & enctbl[enc];
- if (srel->r_offset == irel->r_offset + posn
- && e->new_encoding != enc
- && symval <= e->max_disp)
- {
- einsn[0] &= 0xf1;
- einsn[0] |= (e->new_encoding & 0x1c) >> 1;
- einsn[1] &= 0x3f;
- einsn[1] |= (e->new_encoding & 0x03) << 6;
- gap_size = e->bytes - enctbl[e->new_encoding].bytes;
- gap = insn + posn + enctbl[e->new_encoding].bytes;
- new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes];
- break;
- }
- break;
- } /* Ends switch (reloc type) for m32c. */
- }
- if (gap_size == 0)
- continue;
- *again = true;
- srel->r_info = ELF32_R_INFO (ELF32_R_SYM (srel->r_info), new_type);
- /* Note that we've changed the relocs, section contents, etc. */
- elf_section_data (sec)->relocs = internal_relocs;
- free_relocs = NULL;
- elf_section_data (sec)->this_hdr.contents = contents;
- free_contents = NULL;
- symtab_hdr->contents = (bfd_byte *) intsyms;
- free_intsyms = NULL;
- bytes_saved += gap_size;
- if (! m32c_elf_relax_delete_bytes(abfd, sec, gap - contents, gap_size))
- goto error_return;
- } /* next relocation */
- free (free_relocs);
- free_relocs = NULL;
- if (free_contents != NULL)
- {
- if (! link_info->keep_memory)
- free (free_contents);
- /* Cache the section contents for elf_link_input_bfd. */
- else
- elf_section_data (sec)->this_hdr.contents = contents;
- free_contents = NULL;
- }
- if (shndx_buf != NULL)
- {
- shndx_hdr->contents = NULL;
- free (shndx_buf);
- }
- if (free_intsyms != NULL)
- {
- if (! link_info->keep_memory)
- free (free_intsyms);
- /* Cache the symbols for elf_link_input_bfd. */
- else
- {
- symtab_hdr->contents = NULL /* (unsigned char *) intsyms*/;
- }
- free_intsyms = NULL;
- }
- return true;
- error_return:
- free (free_relocs);
- free (free_contents);
- if (shndx_buf != NULL)
- {
- shndx_hdr->contents = NULL;
- free (shndx_buf);
- }
- free (free_intsyms);
- return false;
- }
- /* Delete some bytes from a section while relaxing. */
- static bool
- m32c_elf_relax_delete_bytes (bfd *abfd,
- asection *sec,
- bfd_vma addr,
- int count)
- {
- Elf_Internal_Shdr *symtab_hdr;
- Elf_Internal_Shdr *shndx_hdr;
- int sec_shndx;
- bfd_byte *contents;
- Elf_Internal_Rela *irel;
- Elf_Internal_Rela *irelend;
- bfd_vma toaddr;
- Elf_Internal_Sym *isym;
- Elf_Internal_Sym *isymend;
- Elf_Internal_Sym *intsyms;
- Elf_External_Sym_Shndx *shndx_buf;
- Elf_External_Sym_Shndx *shndx;
- struct elf_link_hash_entry ** sym_hashes;
- struct elf_link_hash_entry ** end_hashes;
- unsigned int symcount;
- 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;
- if (ELF32_R_TYPE(irel->r_info) == R_M32C_RL_JUMP
- && irel->r_addend == 0x10 /* one byte insn, no relocs */
- && irel->r_offset + 1 < addr
- && irel->r_offset + 7 > addr)
- {
- bfd_vma disp;
- unsigned char *insn = &contents[irel->r_offset];
- disp = *insn;
- /* This is a JMP.S, which we have to manually update. */
- if (elf32_m32c_machine (abfd) == bfd_mach_m16c)
- {
- if ((*insn & 0xf8) != 0x60)
- continue;
- disp = (disp & 7);
- }
- else
- {
- if ((*insn & 0xce) != 0x4a)
- continue;
- disp = ((disp & 0x30) >> 3) | (disp & 1);
- }
- if (irel->r_offset + disp + 2 >= addr+count)
- {
- disp -= count;
- if (elf32_m32c_machine (abfd) == bfd_mach_m16c)
- {
- *insn = (*insn & 0xf8) | disp;
- }
- else
- {
- *insn = (*insn & 0xce) | ((disp & 6) << 3) | (disp & 1);
- }
- }
- }
- }
- /* Adjust the local symbols defined in this section. */
- symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
- intsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
- isym = intsyms;
- isymend = isym + symtab_hdr->sh_info;
- sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
- if (elf_symtab_shndx_list (abfd))
- {
- shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr;
- shndx_buf = (Elf_External_Sym_Shndx *) shndx_hdr->contents;
- }
- else
- {
- shndx_hdr = NULL;
- shndx_buf = NULL;
- }
- shndx = shndx_buf;
- for (; isym < isymend; isym++, shndx = (shndx ? shndx + 1 : NULL))
- {
- /* If the symbol is in the range of memory we just moved, we
- have to adjust its value. */
- if ((int) isym->st_shndx == sec_shndx
- && isym->st_value > addr
- && isym->st_value < toaddr)
- {
- isym->st_value -= count;
- }
- /* If the symbol *spans* the bytes we just deleted (i.e. it's
- *end* is in the moved bytes but it's *start* isn't), then we
- must adjust its size. */
- if ((int) isym->st_shndx == sec_shndx
- && isym->st_value < addr
- && isym->st_value + isym->st_size > addr
- && isym->st_value + isym->st_size < toaddr)
- {
- isym->st_size -= 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 = 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;
- if (sym_hash &&
- (sym_hash->root.type == bfd_link_hash_defined
- || sym_hash->root.type == bfd_link_hash_defweak)
- && sym_hash->root.u.def.section == sec)
- {
- if (sym_hash->root.u.def.value > addr
- && sym_hash->root.u.def.value < toaddr)
- {
- sym_hash->root.u.def.value -= count;
- }
- if (sym_hash->root.u.def.value < addr
- && sym_hash->root.u.def.value + sym_hash->size > addr
- && sym_hash->root.u.def.value + sym_hash->size < toaddr)
- {
- sym_hash->size -= count;
- }
- }
- }
- return true;
- }
- /* This is for versions of gcc prior to 4.3. */
- static unsigned int
- _bfd_m32c_elf_eh_frame_address_size (bfd *abfd,
- const asection *sec ATTRIBUTE_UNUSED)
- {
- if ((elf_elfheader (abfd)->e_flags & EF_M32C_CPU_MASK) == EF_M32C_CPU_M16C)
- return 2;
- return 4;
- }
- #define ELF_ARCH bfd_arch_m32c
- #define ELF_MACHINE_CODE EM_M32C
- #define ELF_MACHINE_ALT1 EM_M32C_OLD
- #define ELF_MAXPAGESIZE 0x100
- #if 0
- #define TARGET_BIG_SYM m32c_elf32_vec
- #define TARGET_BIG_NAME "elf32-m32c"
- #else
- #define TARGET_LITTLE_SYM m32c_elf32_vec
- #define TARGET_LITTLE_NAME "elf32-m32c"
- #endif
- #define elf_info_to_howto_rel NULL
- #define elf_info_to_howto m32c_info_to_howto_rela
- #define elf_backend_object_p m32c_elf_object_p
- #define elf_backend_relocate_section m32c_elf_relocate_section
- #define elf_backend_check_relocs m32c_elf_check_relocs
- #define elf_backend_object_p m32c_elf_object_p
- #define elf_symbol_leading_char ('_')
- #define elf_backend_always_size_sections \
- m32c_elf_always_size_sections
- #define elf_backend_finish_dynamic_sections \
- m32c_elf_finish_dynamic_sections
- #define elf_backend_can_gc_sections 1
- #define elf_backend_eh_frame_address_size _bfd_m32c_elf_eh_frame_address_size
- #define bfd_elf32_bfd_reloc_type_lookup m32c_reloc_type_lookup
- #define bfd_elf32_bfd_reloc_name_lookup m32c_reloc_name_lookup
- #define bfd_elf32_bfd_relax_section m32c_elf_relax_section
- #define bfd_elf32_bfd_set_private_flags m32c_elf_set_private_flags
- #define bfd_elf32_bfd_merge_private_bfd_data m32c_elf_merge_private_bfd_data
- #define bfd_elf32_bfd_print_private_bfd_data m32c_elf_print_private_bfd_data
- #include "elf32-target.h"
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