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author | Nick Clifton <nickc@redhat.com> | 2000-11-30 19:16:54 +0000 |
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committer | Nick Clifton <nickc@redhat.com> | 2000-11-30 19:16:54 +0000 |
commit | 8d88c4ca53bf3be481587f21611576ff82f38ed5 (patch) | |
tree | f88d76c0bcfe6592dd0e356e8d6196fc1c084d49 /bfd/elf64-x86-64.c | |
parent | abf1d184bdd1ddb2e6c4d9d95e3807cbe9fd5c26 (diff) | |
download | fsf-binutils-gdb-8d88c4ca53bf3be481587f21611576ff82f38ed5.zip fsf-binutils-gdb-8d88c4ca53bf3be481587f21611576ff82f38ed5.tar.gz fsf-binutils-gdb-8d88c4ca53bf3be481587f21611576ff82f38ed5.tar.bz2 |
Add support for x86_64-*-linux-gnu* target
Diffstat (limited to 'bfd/elf64-x86-64.c')
-rw-r--r-- | bfd/elf64-x86-64.c | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c new file mode 100644 index 0000000..09aecf9 --- /dev/null +++ b/bfd/elf64-x86-64.c @@ -0,0 +1,353 @@ +/* X86-64 specific support for 64-bit ELF + Copyright 2000 Free Software Foundation, Inc. + Contributed by Jan Hubicka <jh@suse.cz>. + +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/x86-64.h" + +/* We use only the RELA entries. */ +#define USE_RELA + +/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ +#define MINUS_ONE (~ (bfd_vma) 0) + +/* The relocation "howto" table. Order of fields: + type, size, bitsize, pc_relative, complain_on_overflow, special_function, + name, partial_inplace, src_mask, dst_pack, pcrel_offset */ +static reloc_howto_type x86_64_elf_howto_table[] = +{ + HOWTO(R_X86_64_NONE, 0,0, 0,false,0,complain_overflow_dont, 0, "R_X86_64_NONE", false,0x00000000,0x00000000,false), + HOWTO(R_X86_64_64, 0,4,64,false,0,complain_overflow_bitfield,0, "R_X86_64_64", false,MINUS_ONE ,MINUS_ONE ,false), + HOWTO(R_X86_64_PC32, 0,4,32,true ,0,complain_overflow_signed ,0, "R_X86_64_PC32", false,0xffffffff,0xffffffff,true), + HOWTO(R_X86_64_GOT32, 0,4,32,false,0,complain_overflow_signed ,0, "R_X86_64_GOT32", false,0xffffffff,0xffffffff,false), + HOWTO(R_X86_64_PLT32, 0,4,32,true ,0,complain_overflow_signed ,0, "R_X86_64_PLT32", false,0xffffffff,0xffffffff,true), + HOWTO(R_X86_64_COPY, 0,4,32,false,0,complain_overflow_bitfield,0, "R_X86_64_COPY", false,0xffffffff,0xffffffff,false), + HOWTO(R_X86_64_GLOB_DAT, 0,4,64,false,0,complain_overflow_bitfield,0,"R_X86_64_GLOB_DAT",false,MINUS_ONE ,MINUS_ONE ,false), + HOWTO(R_X86_64_RELATIVE ,0,4,64,false,0,complain_overflow_bitfield,0,"R_X86_64_RELATIVE",false,MINUS_ONE ,MINUS_ONE ,false), + HOWTO(R_X86_64_JUMP_SLOT,0,4,64,false,0,complain_overflow_bitfield,0,"R_X86_64_JUMP_SLOT",false,MINUS_ONE,MINUS_ONE ,false), + HOWTO(R_X86_64_GOTPCREL, 0,4,32,true, 0,complain_overflow_signed ,0, "R_X86_64_PCREL", false,0xffffffff,0xffffffff,true), + HOWTO(R_X86_64_32, 0,4,32,false,0,complain_overflow_unsigned,0, "R_X86_64_32", false,0xffffffff,0xffffffff,false), + HOWTO(R_X86_64_32S, 0,4,32,false,0,complain_overflow_signed, 0, "R_X86_64_32S", false,0xffffffff,0xffffffff,false), + HOWTO(R_X86_64_16, 0,1,16,false,0,complain_overflow_bitfield,0, "R_X86_64_16", false,0xffff ,0xffff, false), + HOWTO(R_X86_64_PC16, 0,1,16,true ,0,complain_overflow_bitfield,0, "R_X86_64_PC16", false,0xffff ,0xffff, true), + HOWTO(R_X86_64_8, 0,0, 8,false,0,complain_overflow_signed ,0, "R_X86_64_8", false,0xff ,0xff, false), + HOWTO(R_X86_64_PC8, 0,0, 8,true ,0,complain_overflow_signed ,0, "R_X86_64_PC8", false,0xff ,0xff, true), +}; + +/* Map BFD relocs to the x86_64 elf relocs. */ +struct elf_reloc_map { + bfd_reloc_code_real_type bfd_reloc_val; + unsigned char elf_reloc_val; +}; + +static CONST struct elf_reloc_map x86_64_reloc_map[] = +{ + { BFD_RELOC_NONE, R_X86_64_NONE, }, + { BFD_RELOC_64, R_X86_64_64, }, + { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, + { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, + { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, + { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, + { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, + { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, + { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, + { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, + { BFD_RELOC_32, R_X86_64_32, }, + { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, + { BFD_RELOC_16, R_X86_64_16, }, + { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, + { BFD_RELOC_8, R_X86_64_8, }, + { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, +}; + + +static reloc_howto_type *elf64_x86_64_reloc_type_lookup + PARAMS ((bfd *, bfd_reloc_code_real_type)); +static void elf64_x86_64_info_to_howto + PARAMS ((bfd *, arelent *, Elf64_Internal_Rela *)); +static struct bfd_link_hash_table *elf64_x86_64_link_hash_table_create + PARAMS ((bfd *)); +static boolean elf64_x86_64_relocate_section + PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, + Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); + +/* Given a BFD reloc type, return a HOWTO structure. */ +static reloc_howto_type * +elf64_x86_64_reloc_type_lookup (abfd, code) + bfd *abfd ATTRIBUTE_UNUSED; + bfd_reloc_code_real_type code; +{ + unsigned int i; + for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); + i++) + { + if (x86_64_reloc_map[i].bfd_reloc_val == code) + return &x86_64_elf_howto_table[(int) + x86_64_reloc_map[i].elf_reloc_val]; + } + return 0; +} + + +/* Given an x86_64 ELF reloc type, fill in an arelent structure. */ +static void +elf64_x86_64_info_to_howto (abfd, cache_ptr, dst) + bfd *abfd ATTRIBUTE_UNUSED; + arelent *cache_ptr; + Elf64_Internal_Rela *dst; +{ + unsigned r_type; + + r_type = ELF64_R_TYPE (dst->r_info); + BFD_ASSERT (r_type < (unsigned int) R_X86_64_max); + cache_ptr->howto = &x86_64_elf_howto_table[r_type]; + BFD_ASSERT (r_type == cache_ptr->howto->type); +} + +/* Hash table functions - these will be used by dynamic linking code and + right now they are needed to keep ld happy. */ + +/* x86_64 ELF linker hash table. */ + +struct elf64_x86_64_link_hash_table +{ + struct elf_link_hash_table root; +}; + + +/* Get the X86-64 ELF linker hash table from a link_info structure. */ + +#define elf64_x86_64_hash_table(p) \ + ((struct elf64_x86_64_link_hash_table *) ((p)->hash)) + +/* Create an X86-64 ELF linker hash table. */ + +static struct bfd_link_hash_table * +elf64_x86_64_link_hash_table_create (abfd) + bfd *abfd; +{ + struct elf64_x86_64_link_hash_table *ret; + + ret = ((struct elf64_x86_64_link_hash_table *) + bfd_alloc (abfd, sizeof (struct elf64_x86_64_link_hash_table))); + if (ret == (struct elf64_x86_64_link_hash_table *) NULL) + return NULL; + + if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, + _bfd_elf_link_hash_newfunc)) + { + bfd_release (abfd, ret); + return NULL; + } + + return &ret->root.root; +} + +boolean +elf64_x86_64_elf_object_p (abfd) + bfd *abfd; +{ + /* Set the right machine number for an x86-64 elf64 file. */ + bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); + return true; +} + +/* Relocate an x86_64 ELF section. */ + +static boolean +elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, + contents, relocs, local_syms, local_sections) + bfd *output_bfd; + struct bfd_link_info *info; + bfd *input_bfd; + asection *input_section; + bfd_byte *contents; + Elf_Internal_Rela *relocs; + Elf_Internal_Sym *local_syms; + asection **local_sections; +{ + bfd *dynobj; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + bfd_vma *local_got_offsets; + asection *sreloc; + Elf_Internal_Rela *rel; + Elf_Internal_Rela *relend; + + dynobj = elf_hash_table (info)->dynobj; + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + local_got_offsets = elf_local_got_offsets (input_bfd); + + sreloc = NULL; + if (dynobj != NULL) + abort (); + + rel = relocs; + relend = relocs + input_section->reloc_count; + for (; rel < relend; rel++) + { + int r_type; + reloc_howto_type *howto; + unsigned long r_symndx; + struct elf_link_hash_entry *h; + Elf_Internal_Sym *sym; + asection *sec; + bfd_vma relocation; + bfd_reloc_status_type r; + unsigned int indx; + + r_type = ELF64_R_TYPE (rel->r_info); + + if ((indx = (unsigned) r_type) >= R_X86_64_max) + { + bfd_set_error (bfd_error_bad_value); + return false; + } + howto = x86_64_elf_howto_table + indx; + + r_symndx = ELF64_R_SYM (rel->r_info); + + if (info->relocateable) + { + /* This is a relocateable 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. */ + 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); + } + 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; + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + sec = h->root.u.def.section; + if (sec->output_section == NULL) + { + (*_bfd_error_handler) + (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), + bfd_get_filename (input_bfd), h->root.root.string, + bfd_get_section_name (input_bfd, input_section)); + relocation = 0; + } + else + 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, + (!info->shared || info->no_undefined + || ELF_ST_VISIBILITY (h->other))))) + return false; + relocation = 0; + } + } + /* This function should support shared objects, but don't. */ + if (info->shared) + abort(); + + r = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, rel->r_offset, + relocation, rel->r_addend); + + if (r != bfd_reloc_ok) + { + switch (r) + { + default: + case bfd_reloc_outofrange: + abort (); + case bfd_reloc_overflow: + { + const char *name; + + if (h != NULL) + name = h->root.root.string; + else + { + name = bfd_elf_string_from_elf_section (input_bfd, + symtab_hdr->sh_link, + sym->st_name); + if (name == NULL) + return false; + if (*name == '\0') + name = bfd_section_name (input_bfd, sec); + } + if (! ((*info->callbacks->reloc_overflow) + (info, name, howto->name, (bfd_vma) 0, + input_bfd, input_section, rel->r_offset))) + return false; + } + break; + } + } + } + return true; +} + + +#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec +#define TARGET_LITTLE_NAME "elf64-x86-64" +#define ELF_ARCH bfd_arch_i386 +#define ELF_MACHINE_CODE EM_X86_64 +#define ELF_MAXPAGESIZE 0x100000 +#define elf_info_to_howto elf64_x86_64_info_to_howto +#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup +#define elf_backend_object_p elf64_x86_64_elf_object_p +#define elf_backend_relocate_section elf64_x86_64_relocate_section +#define bfd_elf64_bfd_link_hash_table_create elf64_x86_64_link_hash_table_create + +#include "elf64-target.h" |