1 /* X86-64 specific support for 64-bit ELF
2 Copyright 2000 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 #include "elf/x86-64.h"
28 /* We use only the RELA entries. */
31 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
32 #define MINUS_ONE (~ (bfd_vma) 0)
34 /* The relocation "howto" table. Order of fields:
35 type, size, bitsize, pc_relative, complain_on_overflow, special_function,
36 name, partial_inplace, src_mask, dst_pack, pcrel_offset */
37 static reloc_howto_type x86_64_elf_howto_table[] = {
38 HOWTO(R_X86_64_NONE, 0,0, 0,false,0,complain_overflow_dont, 0, "R_X86_64_NONE", false,0x00000000,0x00000000,false),
39 HOWTO(R_X86_64_64, 0,4,64,false,0,complain_overflow_bitfield,0, "R_X86_64_64", false,MINUS_ONE ,MINUS_ONE ,false),
40 HOWTO(R_X86_64_PC32, 0,4,32,true ,0,complain_overflow_signed ,0, "R_X86_64_PC32", false,0xffffffff,0xffffffff,true),
41 HOWTO(R_X86_64_GOT32, 0,4,32,false,0,complain_overflow_signed ,0, "R_X86_64_GOT32", false,0xffffffff,0xffffffff,false),
42 HOWTO(R_X86_64_PLT32, 0,4,32,true ,0,complain_overflow_signed ,0, "R_X86_64_PLT32", false,0xffffffff,0xffffffff,true),
43 HOWTO(R_X86_64_COPY, 0,4,32,false,0,complain_overflow_bitfield,0, "R_X86_64_COPY", false,0xffffffff,0xffffffff,false),
44 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),
45 HOWTO(R_X86_64_RELATIVE ,0,4,64,false,0,complain_overflow_bitfield,0,"R_X86_64_RELATIVE",false,MINUS_ONE ,MINUS_ONE ,false),
46 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),
47 HOWTO(R_X86_64_GOTPCREL, 0,4,32,true, 0,complain_overflow_signed ,0, "R_X86_64_PCREL", false,0xffffffff,0xffffffff,true),
48 HOWTO(R_X86_64_32, 0,4,32,false,0,complain_overflow_unsigned,0, "R_X86_64_32", false,0xffffffff,0xffffffff,false),
49 HOWTO(R_X86_64_32S, 0,4,32,false,0,complain_overflow_signed, 0, "R_X86_64_32S", false,0xffffffff,0xffffffff,false),
50 HOWTO(R_X86_64_16, 0,1,16,false,0,complain_overflow_bitfield,0, "R_X86_64_16", false,0xffff ,0xffff, false),
51 HOWTO(R_X86_64_PC16, 0,1,16,true ,0,complain_overflow_bitfield,0, "R_X86_64_PC16", false,0xffff ,0xffff, true),
52 HOWTO(R_X86_64_8, 0,0, 8,false,0,complain_overflow_signed ,0, "R_X86_64_8", false,0xff ,0xff, false),
53 HOWTO(R_X86_64_PC8, 0,0, 8,true ,0,complain_overflow_signed ,0, "R_X86_64_PC8", false,0xff ,0xff, true),
56 /* Map BFD relocs to the x86_64 elf relocs. */
57 struct elf_reloc_map {
58 bfd_reloc_code_real_type bfd_reloc_val;
59 unsigned char elf_reloc_val;
62 static CONST struct elf_reloc_map x86_64_reloc_map[] =
64 { BFD_RELOC_NONE, R_X86_64_NONE, },
65 { BFD_RELOC_64, R_X86_64_64, },
66 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
67 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
68 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
69 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
70 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
71 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
72 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
73 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
74 { BFD_RELOC_32, R_X86_64_32, },
75 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
76 { BFD_RELOC_16, R_X86_64_16, },
77 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
78 { BFD_RELOC_8, R_X86_64_8, },
79 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
82 static reloc_howto_type *elf64_x86_64_reloc_type_lookup
83 PARAMS ((bfd *, bfd_reloc_code_real_type));
84 static void elf64_x86_64_info_to_howto
85 PARAMS ((bfd *, arelent *, Elf64_Internal_Rela *));
86 static struct bfd_link_hash_table *elf64_x86_64_link_hash_table_create
88 static boolean elf64_x86_64_relocate_section
89 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
90 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
92 /* Given a BFD reloc type, return a HOWTO structure. */
93 static reloc_howto_type *
94 elf64_x86_64_reloc_type_lookup (abfd, code)
95 bfd *abfd ATTRIBUTE_UNUSED;
96 bfd_reloc_code_real_type code;
99 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
102 if (x86_64_reloc_map[i].bfd_reloc_val == code)
103 return &x86_64_elf_howto_table[(int)
104 x86_64_reloc_map[i].elf_reloc_val];
109 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
112 elf64_x86_64_info_to_howto (abfd, cache_ptr, dst)
113 bfd *abfd ATTRIBUTE_UNUSED;
115 Elf64_Internal_Rela *dst;
119 r_type = ELF64_R_TYPE (dst->r_info);
120 BFD_ASSERT (r_type < (unsigned int) R_X86_64_max);
121 cache_ptr->howto = &x86_64_elf_howto_table[r_type];
122 BFD_ASSERT (r_type == cache_ptr->howto->type);
125 /* Hash table functions - these will be used by dynamic linking code and
126 right now they are needed to keep ld happy. */
128 /* x86_64 ELF linker hash table. */
130 struct elf64_x86_64_link_hash_table {
131 struct elf_link_hash_table root;
134 /* Get the X86-64 ELF linker hash table from a link_info structure. */
136 #define elf64_x86_64_hash_table(p) \
137 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
139 /* Create an X86-64 ELF linker hash table. */
141 static struct bfd_link_hash_table *
142 elf64_x86_64_link_hash_table_create (abfd)
145 struct elf64_x86_64_link_hash_table *ret;
147 ret = ((struct elf64_x86_64_link_hash_table *)
148 bfd_alloc (abfd, sizeof (struct elf64_x86_64_link_hash_table)));
149 if (ret == (struct elf64_x86_64_link_hash_table *) NULL)
152 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
153 _bfd_elf_link_hash_newfunc))
155 bfd_release (abfd, ret);
159 return &ret->root.root;
163 elf64_x86_64_elf_object_p (abfd)
166 /* Set the right machine number for an x86-64 elf64 file. */
167 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
171 /* Relocate an x86_64 ELF section. */
174 elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
175 contents, relocs, local_syms, local_sections)
177 struct bfd_link_info *info;
179 asection *input_section;
181 Elf_Internal_Rela *relocs;
182 Elf_Internal_Sym *local_syms;
183 asection **local_sections;
186 Elf_Internal_Shdr *symtab_hdr;
187 struct elf_link_hash_entry **sym_hashes;
188 bfd_vma *local_got_offsets;
190 Elf_Internal_Rela *rel;
191 Elf_Internal_Rela *relend;
193 dynobj = elf_hash_table (info)->dynobj;
194 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
195 sym_hashes = elf_sym_hashes (input_bfd);
196 local_got_offsets = elf_local_got_offsets (input_bfd);
203 relend = relocs + input_section->reloc_count;
204 for (; rel < relend; rel++)
207 reloc_howto_type *howto;
208 unsigned long r_symndx;
209 struct elf_link_hash_entry *h;
210 Elf_Internal_Sym *sym;
213 bfd_reloc_status_type r;
216 r_type = ELF64_R_TYPE (rel->r_info);
218 if ((indx = (unsigned) r_type) >= R_X86_64_max)
220 bfd_set_error (bfd_error_bad_value);
223 howto = x86_64_elf_howto_table + indx;
225 r_symndx = ELF64_R_SYM (rel->r_info);
227 if (info->relocateable)
229 /* This is a relocateable link. We don't have to change
230 anything, unless the reloc is against a section symbol,
231 in which case we have to adjust according to where the
232 section symbol winds up in the output section. */
233 if (r_symndx < symtab_hdr->sh_info)
235 sym = local_syms + r_symndx;
236 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
238 sec = local_sections[r_symndx];
239 rel->r_addend += sec->output_offset + sym->st_value;
246 /* This is a final link. */
250 if (r_symndx < symtab_hdr->sh_info)
252 sym = local_syms + r_symndx;
253 sec = local_sections[r_symndx];
254 relocation = (sec->output_section->vma
260 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
261 while (h->root.type == bfd_link_hash_indirect
262 || h->root.type == bfd_link_hash_warning)
263 h = (struct elf_link_hash_entry *) h->root.u.i.link;
264 if (h->root.type == bfd_link_hash_defined
265 || h->root.type == bfd_link_hash_defweak)
267 sec = h->root.u.def.section;
268 if (sec->output_section == NULL)
270 (*_bfd_error_handler)
271 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
272 bfd_get_filename (input_bfd), h->root.root.string,
273 bfd_get_section_name (input_bfd, input_section));
277 relocation = (h->root.u.def.value
278 + sec->output_section->vma
279 + sec->output_offset);
281 else if (h->root.type == bfd_link_hash_undefweak)
285 if (! ((*info->callbacks->undefined_symbol)
286 (info, h->root.root.string, input_bfd,
287 input_section, rel->r_offset,
288 (!info->shared || info->no_undefined
289 || ELF_ST_VISIBILITY (h->other)))))
294 /* This function should support shared objects, but don't. */
298 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
299 contents, rel->r_offset,
300 relocation, rel->r_addend);
302 if (r != bfd_reloc_ok)
307 case bfd_reloc_outofrange:
309 case bfd_reloc_overflow:
314 name = h->root.root.string;
317 name = bfd_elf_string_from_elf_section (input_bfd,
323 name = bfd_section_name (input_bfd, sec);
325 if (! ((*info->callbacks->reloc_overflow)
326 (info, name, howto->name, (bfd_vma) 0,
327 input_bfd, input_section, rel->r_offset)))
337 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
338 #define TARGET_LITTLE_NAME "elf64-x86-64"
339 #define ELF_ARCH bfd_arch_i386
340 #define ELF_MACHINE_CODE EM_X86_64
341 #define ELF_MAXPAGESIZE 0x100000
342 #define elf_info_to_howto elf64_x86_64_info_to_howto
343 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
344 #define elf_backend_object_p elf64_x86_64_elf_object_p
345 #define elf_backend_relocate_section elf64_x86_64_relocate_section
346 #define bfd_elf64_bfd_link_hash_table_create elf64_x86_64_link_hash_table_create
348 #include "elf64-target.h"