| /* M16C/M32C specific support for 32-bit ELF. |
| Copyright (C) 2005 |
| 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| #include "bfd.h" |
| #include "sysdep.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 void m32c_info_to_howto_rela |
| (bfd *, arelent *, Elf_Internal_Rela *); |
| static bfd_boolean m32c_elf_relocate_section |
| (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **); |
| static bfd_boolean m32c_elf_gc_sweep_hook |
| (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *); |
| static asection * m32c_elf_gc_mark_hook |
| (asection *, struct bfd_link_info *, Elf_Internal_Rela *, struct elf_link_hash_entry *, Elf_Internal_Sym *); |
| static bfd_boolean m32c_elf_check_relocs |
| (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *); |
| static bfd_boolean m32c_elf_relax_delete_bytes (bfd *, asection *, bfd_vma, int); |
| #ifdef DEBUG |
| static char * m32c_get_reloc (long reloc); |
| #endif |
| static bfd_boolean m32c_elf_relax_section |
| (bfd *abfd, asection *sec, struct bfd_link_info *link_info, bfd_boolean *again); |
| |
| |
| static reloc_howto_type m32c_elf_howto_table [] = |
| { |
| /* This reloc does nothing. */ |
| HOWTO (R_M32C_NONE, /* type */ |
| 0, /* rightshift */ |
| 0, /* 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_NONE", /* name */ |
| FALSE, /* partial_inplace */ |
| 0, /* src_mask */ |
| 0, /* dst_mask */ |
| FALSE), /* pcrel_offset */ |
| |
| HOWTO (R_M32C_16, /* type */ |
| 0, /* rightshift */ |
| 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 16, /* bitsize */ |
| FALSE, /* pc_relative */ |
| 0, /* bitpos */ |
| complain_overflow_bitfield, /* complain_on_overflow */ |
| bfd_elf_generic_reloc, /* special_function */ |
| "R_M32C_16", /* name */ |
| FALSE, /* partial_inplace */ |
| 0, /* src_mask */ |
| 0x0000ffff, /* 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_bitfield, /* complain_on_overflow */ |
| bfd_elf_generic_reloc, /* special_function */ |
| "R_M32C_24", /* name */ |
| FALSE, /* partial_inplace */ |
| 0, /* src_mask */ |
| 0x00ffffff, /* 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 */ |
| 0x000000ff, /* 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 */ |
| 0, /* 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 */ |
| 0x000000ff, /* 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 */ |
| 0x0000ffff, /* 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 */ |
| 0x000000ff, /* 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 */ |
| 0x0000ffff, /* 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 } |
| }; |
| |
| 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; |
| } |
| |
| /* Set the howto pointer for an M32C ELF reloc. */ |
| |
| static void |
| m32c_info_to_howto_rela |
| (bfd * abfd ATTRIBUTE_UNUSED, |
| arelent * cache_ptr, |
| Elf_Internal_Rela * dst) |
| { |
| unsigned int r_type; |
| |
| r_type = ELF32_R_TYPE (dst->r_info); |
| BFD_ASSERT (r_type < (unsigned int) R_M32C_max); |
| cache_ptr->howto = & m32c_elf_howto_table [r_type]; |
| } |
| |
| |
| |
| /* 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 bfd_boolean |
| 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; |
| bfd *dynobj; |
| asection *splt; |
| |
| symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| sym_hashes = elf_sym_hashes (input_bfd); |
| relend = relocs + input_section->reloc_count; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| splt = NULL; |
| if (dynobj != NULL) |
| splt = bfd_get_section_by_name (dynobj, ".plt"); |
| |
| 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); |
| |
| r_symndx = ELF32_R_SYM (rel->r_info); |
| |
| if (info->relocatable) |
| { |
| /* 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 (r_symndx < symtab_hdr->sh_info) |
| { |
| sym = local_syms + r_symndx; |
| |
| if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| { |
| sec = local_sections [r_symndx]; |
| rel->r_addend += sec->output_offset + sym->st_value; |
| } |
| } |
| |
| continue; |
| } |
| |
| /* This is a final link. */ |
| howto = m32c_elf_howto_table + ELF32_R_TYPE (rel->r_info); |
| h = NULL; |
| sym = NULL; |
| sec = NULL; |
| |
| 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 = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; |
| } |
| 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; |
| |
| 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) |
| { |
| relocation = 0; |
| } |
| else |
| { |
| if (! ((*info->callbacks->undefined_symbol) |
| (info, h->root.root.string, input_bfd, |
| input_section, rel->r_offset, TRUE))) |
| return FALSE; |
| relocation = 0; |
| } |
| } |
| |
| 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)); |
| } |
| } |
| break; |
| |
| case R_M32C_HI8: |
| case R_M32C_HI16: |
| relocation >>= 16; |
| break; |
| } |
| |
| r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| contents, rel->r_offset, relocation, |
| rel->r_addend); |
| |
| if (r != bfd_reloc_ok) |
| { |
| const char * msg = (const char *) NULL; |
| |
| switch (r) |
| { |
| case bfd_reloc_overflow: |
| r = 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: |
| r = 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) |
| r = info->callbacks->warning |
| (info, msg, name, input_bfd, input_section, rel->r_offset); |
| |
| if (! r) |
| return FALSE; |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| /* Return the section that should be marked against GC for a given |
| relocation. */ |
| |
| static asection * |
| m32c_elf_gc_mark_hook |
| (asection * sec, |
| struct bfd_link_info * info ATTRIBUTE_UNUSED, |
| Elf_Internal_Rela * rel, |
| struct elf_link_hash_entry * h, |
| Elf_Internal_Sym * sym) |
| { |
| if (h != NULL) |
| { |
| switch (ELF32_R_TYPE (rel->r_info)) |
| { |
| default: |
| switch (h->root.type) |
| { |
| case bfd_link_hash_defined: |
| case bfd_link_hash_defweak: |
| return h->root.u.def.section; |
| |
| case bfd_link_hash_common: |
| return h->root.u.c.p->section; |
| |
| default: |
| break; |
| } |
| } |
| } |
| else |
| { |
| if (!(elf_bad_symtab (sec->owner) |
| && ELF_ST_BIND (sym->st_info) != STB_LOCAL) |
| && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) |
| && sym->st_shndx != SHN_COMMON)) |
| { |
| return bfd_section_from_elf_index (sec->owner, sym->st_shndx); |
| } |
| } |
| |
| return NULL; |
| } |
| |
| /* Update the got entry reference counts for the section being removed. */ |
| |
| static bfd_boolean |
| m32c_elf_gc_sweep_hook |
| (bfd * abfd ATTRIBUTE_UNUSED, |
| struct bfd_link_info * info ATTRIBUTE_UNUSED, |
| asection * sec ATTRIBUTE_UNUSED, |
| const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED) |
| { |
| 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 bfd_boolean |
| 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; |
| struct elf_link_hash_entry ** sym_hashes_end; |
| const Elf_Internal_Rela * rel; |
| const Elf_Internal_Rela * rel_end; |
| bfd_vma *local_plt_offsets; |
| asection *splt; |
| bfd *dynobj; |
| |
| if (info->relocatable) |
| 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; |
| |
| sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); |
| if (!elf_bad_symtab (abfd)) |
| sym_hashes_end -= symtab_hdr->sh_info; |
| |
| 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; |
| if (splt == NULL) |
| { |
| splt = bfd_get_section_by_name (dynobj, ".plt"); |
| if (splt == NULL) |
| { |
| splt = bfd_make_section (dynobj, ".plt"); |
| if (splt == NULL |
| || ! bfd_set_section_flags (dynobj, splt, |
| (SEC_ALLOC |
| | SEC_LOAD |
| | SEC_HAS_CONTENTS |
| | SEC_IN_MEMORY |
| | SEC_LINKER_CREATED |
| | SEC_READONLY |
| | SEC_CODE)) |
| || ! bfd_set_section_alignment (dynobj, 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 bfd_boolean |
| m32c_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED, |
| struct bfd_link_info *info) |
| { |
| bfd *dynobj; |
| asection *splt; |
| |
| /* As an extra sanity check, verify that all plt entries have |
| been filled in. */ |
| |
| if ((dynobj = elf_hash_table (info)->dynobj) != NULL |
| && (splt = bfd_get_section_by_name (dynobj, ".plt")) != 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 bfd_boolean |
| m32c_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, |
| struct bfd_link_info *info) |
| { |
| bfd *dynobj; |
| asection *splt; |
| |
| if (info->relocatable) |
| return TRUE; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| if (dynobj == NULL) |
| return TRUE; |
| |
| splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 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 bfd_boolean |
| 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 bfd_boolean |
| m32c_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) |
| { |
| flagword old_flags, old_partial; |
| flagword new_flags, new_partial; |
| bfd_boolean 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%.8lx, new_flags = 0x%.8lx, 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) |
| (_("%s: compiled with %s and linked with modules compiled with %s"), |
| bfd_get_filename (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) |
| (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"), |
| bfd_get_filename (ibfd), (long)new_flags, (long)old_flags); |
| } |
| } |
| |
| if (error) |
| bfd_set_error (bfd_error_bad_value); |
| |
| return !error; |
| } |
| |
| |
| static bfd_boolean |
| m32c_elf_print_private_bfd_data (bfd *abfd, PTR 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:"), (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 bfd_boolean |
| m32c_elf_object_p (bfd *abfd) |
| { |
| bfd_default_set_arch_mach (abfd, bfd_arch_m32c, |
| elf32_m32c_machine (abfd)); |
| return TRUE; |
| } |
| |
| |
| #ifdef DEBUG |
| static 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; |
| bfd_boolean 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"; |
| case STT_SECTION: st_info_str = "STT_SECTION"; |
| case STT_SRELC: st_info_str = "STT_SRELC"; |
| case STT_FILE: st_info_str = "STT_FILE"; |
| case STT_OBJECT: st_info_str = "STT_OBJECT"; |
| case STT_TLS: st_info_str = "STT_TLS"; |
| default: st_info_str = ""; |
| } |
| switch (ELF_ST_BIND (isym->st_info)) |
| { |
| case STB_LOCAL: st_info_stb_str = "STB_LOCAL"; |
| case STB_GLOBAL: st_info_stb_str = "STB_GLOBAL"; |
| default: st_info_stb_str = ""; |
| } |
| switch (ELF_ST_VISIBILITY (isym->st_other)) |
| { |
| case STV_DEFAULT: st_other_str = "STV_DEFAULT"; |
| case STV_INTERNAL: st_other_str = "STV_INTERNAL"; |
| case STV_PROTECTED: st_other_str = "STV_PROTECTED"; |
| default: st_other_str = ""; |
| } |
| switch (isym->st_shndx) |
| { |
| case SHN_ABS: st_shndx_str = "SHN_ABS"; |
| case SHN_COMMON: st_shndx_str = "SHN_COMMON"; |
| case SHN_UNDEF: st_shndx_str = "SHN_UNDEF"; |
| 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); |
| } |
| |
| static 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; |
| bfd_boolean *again; |
| }; |
| |
| static bfd_boolean |
| m32c_relax_plt_check (struct elf_link_hash_entry *h, |
| PTR xdata) |
| { |
| struct relax_plt_data *data = (struct relax_plt_data *) xdata; |
| |
| if (h->root.type == bfd_link_hash_warning) |
| h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| |
| 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 bfd_boolean |
| m32c_relax_plt_realloc (struct elf_link_hash_entry *h, |
| PTR xdata) |
| { |
| bfd_vma *entry = (bfd_vma *) xdata; |
| |
| if (h->root.type == bfd_link_hash_warning) |
| h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| |
| if (h->plt.offset != (bfd_vma) -1) |
| { |
| h->plt.offset = *entry; |
| *entry += 4; |
| } |
| |
| return TRUE; |
| } |
| |
| static bfd_boolean |
| m32c_elf_relax_plt_section (bfd *dynobj, |
| asection *splt, |
| struct bfd_link_info *info, |
| bfd_boolean *again) |
| { |
| struct relax_plt_data relax_plt_data; |
| bfd *ibfd; |
| |
| /* Assume nothing changes. */ |
| *again = FALSE; |
| |
| if (info->relocatable) |
| return TRUE; |
| |
| /* We only relax the .plt section at the moment. */ |
| if (dynobj != elf_hash_table (info)->dynobj |
| || strcmp (splt->name, ".plt") != 0) |
| 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; |
| } |
| |
| struct relax_reloc_s |
| { |
| int machine; |
| int opcode_mask; |
| bfd_vma opcode; /* original opcode or insn part */ |
| int relax_backward; /* lbound */ |
| int relax_forward; /* hbound */ |
| int value_shift; |
| int mask; |
| int new_opcode; /* new opcode */ |
| int old_reloc; /* old relocation */ |
| int new_reloc; /* new relocation */ |
| int use_pcrel; |
| int delete_n; /* # bytes differ between original and new */ |
| }; |
| static struct relax_reloc_s relax_reloc [] = |
| { |
| #if 0 |
| { |
| bfd_mach_m16c, |
| 0xff, |
| 0xfc, /* jmp.a */ |
| -32768, |
| 32767, |
| 2, |
| 0xffffff00, |
| 0xf4, /* jmp.w */ |
| R_M32C_8_ELABEL24, |
| R_M32C_8_PCREL16, |
| 1, |
| 1, |
| }, |
| { |
| bfd_mach_m32c, |
| 0xff, |
| 0xcc, /* jmp.a */ |
| -32768, |
| 32767, |
| 2, |
| 0xffffff00, |
| 0xce, /* jmp.w */ |
| R_M32C_8_ELABEL24, |
| R_M32C_8_PCREL16, |
| 1, |
| 1, |
| }, |
| { |
| bfd_mach_m32c, |
| 0xff, |
| 0xcd, /* jsr.a */ |
| -32768, |
| 32767, |
| 2, |
| 0xffffff00, |
| 0xcf, /* jsr.w */ |
| R_M32C_8_ELABEL24, |
| R_M32C_8_PCREL16, |
| 1, |
| 1, |
| }, |
| { |
| bfd_mach_m16c, |
| 0xff, |
| 0xf4, /* jmp.w */ |
| -128, |
| 127, |
| 2, |
| 0xffffff00, |
| 0xfe, /* jmp.b */ |
| R_M32C_8_PCREL16, |
| R_M32C_8_PCREL8, |
| 1, |
| 1, |
| }, |
| { |
| bfd_mach_m32c, |
| 0xff, |
| 0xce, /* jmp.w */ |
| -128, |
| 127, |
| 2, |
| 0xffffff00, |
| 0xbb, /* jmp.b */ |
| R_M32C_8_PCREL16, |
| R_M32C_8_PCREL8, |
| 1, |
| 1, |
| }, |
| { |
| bfd_mach_m32c, |
| 0xc0f6, |
| 0x8096, /* dest */ |
| 0, |
| 0xffff, |
| 3, |
| 0xffff3fff, |
| 0xc000, /* abs16 */ |
| R_M32C_24_ABS24, |
| R_M32C_24_ABS16, |
| 0, |
| 1, |
| }, |
| { |
| bfd_mach_m32c, |
| 0xc0f6, |
| 0x80a6, /* dest */ |
| 0, |
| 0xffff, |
| 4, |
| 0xffff3fff, |
| 0xc000, /* abs16 */ |
| R_M32C_32_ABS24, |
| R_M32C_32_ABS16, |
| 0, |
| 1, |
| }, |
| { |
| bfd_mach_m32c, |
| 0xc0f6, |
| 0x80b6, /* dest */ |
| 0, |
| 0xffff, |
| 5, |
| 0xffff3fff, |
| 0xc000, /* abs16 */ |
| R_M32C_40_ABS24, |
| R_M32C_40_ABS16, |
| 0, |
| 1, |
| }, |
| { |
| bfd_mach_m32c, |
| 0x30f0, |
| 0x20b0, /* src */ |
| 0, |
| 0xffff, |
| 2, |
| 0xffffcfff, |
| 0x3000, /* abs16 */ |
| R_M32C_16_ABS24, |
| R_M32C_16_ABS16, |
| 0, |
| 1, |
| }, |
| { |
| bfd_mach_m32c, |
| 0xc086, |
| 0x8086, /* dest */ |
| 0, |
| 0xffff, |
| 2, |
| 0xffff3fff, |
| 0xc000, /* abs16 */ |
| R_M32C_16_ABS24, |
| R_M32C_16_ABS16, |
| 0, |
| 1, |
| }, |
| #endif |
| { |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| } |
| }; |
| static bfd_boolean |
| m32c_elf_relax_section |
| (bfd * abfd, |
| asection * sec, |
| struct bfd_link_info * link_info, |
| bfd_boolean * 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; |
| bfd_byte * contents = NULL; |
| bfd_byte * free_contents = NULL; |
| Elf32_External_Sym *extsyms = NULL; |
| Elf32_External_Sym *free_extsyms = NULL; |
| Elf_External_Sym_Shndx *shndx_buf = NULL; |
| int machine; |
| |
| if (abfd == elf_hash_table (link_info)->dynobj |
| && strcmp (sec->name, ".plt") == 0) |
| return m32c_elf_relax_plt_section (abfd, 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 (link_info->relocatable |
| || (sec->flags & SEC_RELOC) == 0 |
| || sec->reloc_count == 0 |
| || (sec->flags & SEC_CODE) == 0) |
| return TRUE; |
| |
| /* Relaxing doesn't quite work right yet. */ |
| return TRUE; |
| |
| symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr; |
| |
| /* Get a copy of the native relocations. */ |
| internal_relocs = (_bfd_elf_link_read_relocs |
| (abfd, sec, (PTR) 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; |
| |
| /* Walk through them looking for relaxing opportunities. */ |
| irelend = internal_relocs + sec->reloc_count; |
| |
| for (irel = internal_relocs; irel < irelend; irel++) |
| { |
| bfd_vma symval; |
| bfd_vma insn; |
| bfd_vma pc; |
| bfd_signed_vma pcrel_value; |
| bfd_vma addend; |
| int to_delete; |
| int i; |
| |
| /* Get the section contents. */ |
| if (contents == NULL) |
| { |
| 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 if we haven't done so already. */ |
| if (extsyms == NULL) |
| { |
| /* Get cached copy if it exists. */ |
| if (symtab_hdr->contents != NULL) |
| extsyms = (Elf32_External_Sym *) symtab_hdr->contents; |
| else |
| { |
| bfd_size_type amt = symtab_hdr->sh_size; |
| |
| /* Go get them off disk. */ |
| extsyms = (Elf32_External_Sym *) bfd_malloc (amt); |
| if (extsyms == NULL) |
| goto error_return; |
| free_extsyms = extsyms; |
| if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 |
| || bfd_bread (extsyms, amt, abfd) != amt) |
| goto error_return; |
| symtab_hdr->contents = (bfd_byte *) extsyms; |
| } |
| |
| if (shndx_hdr->sh_size != 0) |
| { |
| bfd_size_type amt; |
| |
| amt = symtab_hdr->sh_info; |
| amt *= sizeof (Elf_External_Sym_Shndx); |
| shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt); |
| if (shndx_buf == NULL) |
| goto error_return; |
| if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0 |
| || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt) |
| goto error_return; |
| shndx_hdr->contents = (bfd_byte *) shndx_buf; |
| } |
| } |
| |
| /* 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. */ |
| Elf32_External_Sym *esym; |
| Elf_External_Sym_Shndx *shndx; |
| Elf_Internal_Sym isym; |
| |
| esym = extsyms + ELF32_R_SYM (irel->r_info); |
| shndx = shndx_buf + (shndx_buf ? ELF32_R_SYM (irel->r_info) : 0); |
| bfd_elf32_swap_symbol_in (abfd, esym, shndx, &isym); |
| |
| symval = (isym.st_value |
| + sec->output_section->vma |
| + 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. */ |
| continue; |
| |
| symval = (h->root.u.def.value |
| + h->root.u.def.section->output_section->vma |
| + h->root.u.def.section->output_offset); |
| } |
| |
| /* 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 - 2); |
| |
| insn = bfd_get_16 (abfd, contents + irel->r_offset + 0); |
| |
| addend = irel->r_addend; |
| for (i = 0; relax_reloc[i].machine; i++) |
| { |
| #ifdef DEBUG |
| _bfd_error_handler ("insn %x %d mask %x opcode %x =%x\n", |
| insn, i, relax_reloc[i].opcode_mask, |
| relax_reloc[i].opcode, |
| (insn & relax_reloc[i].opcode_mask) == relax_reloc[i].opcode); |
| #endif |
| if (!(machine == relax_reloc[i].machine |
| && (insn & relax_reloc[i].opcode_mask) == relax_reloc[i].opcode |
| && (relax_reloc[i].old_reloc |
| == (int) ELF32_R_TYPE(irel->r_info)))) |
| continue; |
| |
| /* At this point we've confirmed we have a matching insn. Now |
| ensure the operand is in range. */ |
| if (relax_reloc[i].use_pcrel) |
| { |
| pc = sec->output_section->vma + sec->output_offset |
| + irel->r_offset; |
| pcrel_value = symval - pc; |
| #ifndef USE_REL /* put in for learning purposes */ |
| pcrel_value += addend; |
| #else |
| addend = bfd_get_signed_16 (abfd, contents + irel->r_offset + 2); |
| pcrel_value += addend; |
| #endif |
| } |
| else |
| pcrel_value = symval; |
| |
| if (pcrel_value >= relax_reloc[i].relax_backward |
| && pcrel_value < relax_reloc[i].relax_forward + 2) |
| { |
| /* We can relax to a shorter operand. */ |
| insn = (insn & relax_reloc[i].mask) | relax_reloc[i].new_opcode; |
| |
| to_delete = relax_reloc[i].delete_n; |
| |
| /* Rewrite the insn. */ |
| bfd_put_16 (abfd, insn, contents + irel->r_offset); |
| |
| /* Set the new reloc type. */ |
| irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| relax_reloc[i].new_reloc); |
| irel->r_addend = pcrel_value; |
| } |
| else |
| continue; |
| |
| #ifdef DEBUG |
| _bfd_error_handler ("insn %x pc %x index %d mask %x shift %d delete %d\n" |
| "old reloc %s new reloc %s", |
| insn, sec->output_section->vma |
| + sec->output_offset + irel->r_offset + 2, |
| i, relax_reloc[i].opcode_mask, |
| relax_reloc[i].value_shift, to_delete, |
| m32c_get_reloc (relax_reloc[i].old_reloc), |
| m32c_get_reloc (relax_reloc[i].new_reloc)); |
| #endif |
| |
| /* 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 *) extsyms; |
| free_extsyms = NULL; |
| |
| /* Delete TO_DELETE bytes of data. */ |
| if (! m32c_elf_relax_delete_bytes |
| (abfd, sec, irel->r_offset + relax_reloc[i].value_shift, |
| to_delete)) |
| goto error_return; |
| } /* next relax_reloc */ |
| } /* next relocation */ |
| |
| if (free_relocs != NULL) |
| { |
| 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_extsyms != NULL) |
| { |
| if (! link_info->keep_memory) |
| free (free_extsyms); |
| /* Cache the symbols for elf_link_input_bfd. */ |
| else |
| symtab_hdr->contents = NULL /* (unsigned char *) extsyms*/; |
| |
| free_extsyms = NULL; |
| } |
| /* elf_link_input_bfd expects internal syms. */ |
| symtab_hdr->contents = NULL; |
| |
| return TRUE; |
| |
| error_return: |
| if (free_relocs != NULL) |
| free (free_relocs); |
| if (free_contents != NULL) |
| free (free_contents); |
| if (shndx_buf != NULL) |
| { |
| shndx_hdr->contents = NULL; |
| free (shndx_buf); |
| } |
| if (free_extsyms != NULL) |
| free (free_extsyms); |
| return FALSE; |
| } |
| |
| /* Delete some bytes from a section while relaxing. */ |
| |
| static bfd_boolean |
| 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; |
| Elf_Internal_Rela *irelalign; |
| bfd_vma toaddr; |
| Elf32_External_Sym *esym; |
| Elf32_External_Sym *esymend; |
| Elf32_External_Sym *extsyms; |
| 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; |
| |
| symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| extsyms = (Elf32_External_Sym *) symtab_hdr->contents; |
| shndx_hdr = & elf_tdata (abfd)->symtab_shndx_hdr; |
| shndx_buf = (Elf_External_Sym_Shndx *) shndx_hdr->contents; |
| sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| contents = elf_section_data (sec)->this_hdr.contents; |
| |
| /* The deletion must stop at the next ALIGN reloc for an aligment |
| power larger than the number of bytes we are deleting. */ |
| irelalign = NULL; |
| 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 (irel->r_addend > addr && irel->r_addend < toaddr) |
| irel->r_addend -= count; |
| } |
| |
| /* Adjust the local symbols defined in this section. */ |
| shndx = shndx_buf; |
| esym = extsyms; |
| esymend = esym + symtab_hdr->sh_info; |
| for (; esym < esymend; esym++, shndx = (shndx ? shndx + 1 : NULL)) |
| { |
| Elf_Internal_Sym isym; |
| Elf_External_Sym_Shndx dummy; |
| |
| bfd_elf32_swap_symbol_in (abfd, esym, shndx, &isym); |
| |
| if ((int) isym.st_shndx == sec_shndx |
| && isym.st_value > addr |
| && isym.st_value < toaddr) |
| { |
| isym.st_value -= count; |
| bfd_elf32_swap_symbol_out (abfd, &isym, (PTR) esym, (PTR) & dummy); |
| } |
| } |
| |
| /* 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); |
| // sym_hashes += symtab_hdr->sh_info; |
| 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 |
| && sym_hash->root.u.def.value > addr |
| && sym_hash->root.u.def.value < toaddr) |
| sym_hash->root.u.def.value -= count; |
| } |
| |
| return TRUE; |
| } |
| |
| |
| #define ELF_ARCH bfd_arch_m32c |
| #define ELF_MACHINE_CODE EM_M32C |
| #define ELF_MAXPAGESIZE 0x1000 |
| |
| #if 0 |
| #define TARGET_BIG_SYM bfd_elf32_m32c_vec |
| #define TARGET_BIG_NAME "elf32-m32c" |
| #else |
| #define TARGET_LITTLE_SYM bfd_elf32_m32c_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_gc_mark_hook m32c_elf_gc_mark_hook |
| #define elf_backend_gc_sweep_hook m32c_elf_gc_sweep_hook |
| #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 bfd_elf32_bfd_reloc_type_lookup m32c_reloc_type_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" |