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8d88c4ca NC |
1 | /* X86-64 specific support for 64-bit ELF |
2 | Copyright 2000 Free Software Foundation, Inc. | |
3 | Contributed by Jan Hubicka <jh@suse.cz>. | |
4 | ||
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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. */ | |
20 | ||
21 | #include "bfd.h" | |
22 | #include "sysdep.h" | |
23 | #include "libbfd.h" | |
24 | #include "elf-bfd.h" | |
25 | ||
26 | #include "elf/x86-64.h" | |
27 | ||
28 | /* We use only the RELA entries. */ | |
29 | #define USE_RELA | |
30 | ||
31 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ | |
32 | #define MINUS_ONE (~ (bfd_vma) 0) | |
33 | ||
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 */ | |
8da6118f | 37 | static reloc_howto_type x86_64_elf_howto_table[] = { |
8d88c4ca NC |
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), | |
54 | }; | |
55 | ||
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; | |
60 | }; | |
61 | ||
62 | static CONST struct elf_reloc_map x86_64_reloc_map[] = | |
63 | { | |
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, }, | |
80 | }; | |
81 | ||
8d88c4ca NC |
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 | |
87 | PARAMS ((bfd *)); | |
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 **)); | |
91 | ||
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; | |
97 | { | |
98 | unsigned int i; | |
99 | for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); | |
100 | i++) | |
101 | { | |
102 | if (x86_64_reloc_map[i].bfd_reloc_val == code) | |
8da6118f KH |
103 | return &x86_64_elf_howto_table[(int) |
104 | x86_64_reloc_map[i].elf_reloc_val]; | |
8d88c4ca NC |
105 | } |
106 | return 0; | |
107 | } | |
108 | ||
8d88c4ca | 109 | /* Given an x86_64 ELF reloc type, fill in an arelent structure. */ |
8da6118f | 110 | |
8d88c4ca NC |
111 | static void |
112 | elf64_x86_64_info_to_howto (abfd, cache_ptr, dst) | |
113 | bfd *abfd ATTRIBUTE_UNUSED; | |
114 | arelent *cache_ptr; | |
115 | Elf64_Internal_Rela *dst; | |
116 | { | |
117 | unsigned r_type; | |
118 | ||
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); | |
123 | } | |
124 | ||
125 | /* Hash table functions - these will be used by dynamic linking code and | |
126 | right now they are needed to keep ld happy. */ | |
127 | ||
128 | /* x86_64 ELF linker hash table. */ | |
129 | ||
8da6118f | 130 | struct elf64_x86_64_link_hash_table { |
8d88c4ca NC |
131 | struct elf_link_hash_table root; |
132 | }; | |
133 | ||
8d88c4ca NC |
134 | /* Get the X86-64 ELF linker hash table from a link_info structure. */ |
135 | ||
136 | #define elf64_x86_64_hash_table(p) \ | |
137 | ((struct elf64_x86_64_link_hash_table *) ((p)->hash)) | |
138 | ||
139 | /* Create an X86-64 ELF linker hash table. */ | |
140 | ||
141 | static struct bfd_link_hash_table * | |
142 | elf64_x86_64_link_hash_table_create (abfd) | |
143 | bfd *abfd; | |
144 | { | |
145 | struct elf64_x86_64_link_hash_table *ret; | |
146 | ||
147 | ret = ((struct elf64_x86_64_link_hash_table *) | |
8da6118f | 148 | bfd_alloc (abfd, sizeof (struct elf64_x86_64_link_hash_table))); |
8d88c4ca NC |
149 | if (ret == (struct elf64_x86_64_link_hash_table *) NULL) |
150 | return NULL; | |
151 | ||
152 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, | |
153 | _bfd_elf_link_hash_newfunc)) | |
154 | { | |
155 | bfd_release (abfd, ret); | |
156 | return NULL; | |
157 | } | |
158 | ||
159 | return &ret->root.root; | |
160 | } | |
161 | ||
162 | boolean | |
163 | elf64_x86_64_elf_object_p (abfd) | |
164 | bfd *abfd; | |
165 | { | |
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); | |
168 | return true; | |
169 | } | |
170 | ||
171 | /* Relocate an x86_64 ELF section. */ | |
172 | ||
173 | static boolean | |
174 | elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, | |
175 | contents, relocs, local_syms, local_sections) | |
176 | bfd *output_bfd; | |
177 | struct bfd_link_info *info; | |
178 | bfd *input_bfd; | |
179 | asection *input_section; | |
180 | bfd_byte *contents; | |
181 | Elf_Internal_Rela *relocs; | |
182 | Elf_Internal_Sym *local_syms; | |
183 | asection **local_sections; | |
184 | { | |
185 | bfd *dynobj; | |
186 | Elf_Internal_Shdr *symtab_hdr; | |
187 | struct elf_link_hash_entry **sym_hashes; | |
188 | bfd_vma *local_got_offsets; | |
189 | asection *sreloc; | |
190 | Elf_Internal_Rela *rel; | |
191 | Elf_Internal_Rela *relend; | |
192 | ||
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); | |
197 | ||
198 | sreloc = NULL; | |
199 | if (dynobj != NULL) | |
200 | abort (); | |
201 | ||
202 | rel = relocs; | |
203 | relend = relocs + input_section->reloc_count; | |
204 | for (; rel < relend; rel++) | |
205 | { | |
206 | int r_type; | |
207 | reloc_howto_type *howto; | |
208 | unsigned long r_symndx; | |
209 | struct elf_link_hash_entry *h; | |
210 | Elf_Internal_Sym *sym; | |
211 | asection *sec; | |
212 | bfd_vma relocation; | |
213 | bfd_reloc_status_type r; | |
214 | unsigned int indx; | |
215 | ||
216 | r_type = ELF64_R_TYPE (rel->r_info); | |
217 | ||
218 | if ((indx = (unsigned) r_type) >= R_X86_64_max) | |
8da6118f KH |
219 | { |
220 | bfd_set_error (bfd_error_bad_value); | |
221 | return false; | |
222 | } | |
8d88c4ca NC |
223 | howto = x86_64_elf_howto_table + indx; |
224 | ||
225 | r_symndx = ELF64_R_SYM (rel->r_info); | |
226 | ||
227 | if (info->relocateable) | |
8da6118f KH |
228 | { |
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) | |
234 | { | |
235 | sym = local_syms + r_symndx; | |
236 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
237 | { | |
238 | sec = local_sections[r_symndx]; | |
239 | rel->r_addend += sec->output_offset + sym->st_value; | |
240 | } | |
241 | } | |
242 | ||
243 | continue; | |
244 | } | |
8d88c4ca NC |
245 | |
246 | /* This is a final link. */ | |
247 | h = NULL; | |
248 | sym = NULL; | |
249 | sec = NULL; | |
250 | if (r_symndx < symtab_hdr->sh_info) | |
8da6118f KH |
251 | { |
252 | sym = local_syms + r_symndx; | |
253 | sec = local_sections[r_symndx]; | |
254 | relocation = (sec->output_section->vma | |
255 | + sec->output_offset | |
256 | + sym->st_value); | |
257 | } | |
8d88c4ca | 258 | else |
8da6118f KH |
259 | { |
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) | |
266 | { | |
267 | sec = h->root.u.def.section; | |
268 | if (sec->output_section == NULL) | |
269 | { | |
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)); | |
274 | relocation = 0; | |
275 | } | |
276 | else | |
277 | relocation = (h->root.u.def.value | |
278 | + sec->output_section->vma | |
279 | + sec->output_offset); | |
280 | } | |
281 | else if (h->root.type == bfd_link_hash_undefweak) | |
282 | relocation = 0; | |
283 | else | |
284 | { | |
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))))) | |
290 | return false; | |
291 | relocation = 0; | |
292 | } | |
293 | } | |
8d88c4ca NC |
294 | /* This function should support shared objects, but don't. */ |
295 | if (info->shared) | |
8da6118f | 296 | abort (); |
8d88c4ca NC |
297 | |
298 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
8da6118f KH |
299 | contents, rel->r_offset, |
300 | relocation, rel->r_addend); | |
8d88c4ca NC |
301 | |
302 | if (r != bfd_reloc_ok) | |
8da6118f KH |
303 | { |
304 | switch (r) | |
305 | { | |
306 | default: | |
307 | case bfd_reloc_outofrange: | |
308 | abort (); | |
309 | case bfd_reloc_overflow: | |
310 | { | |
311 | const char *name; | |
312 | ||
313 | if (h != NULL) | |
314 | name = h->root.root.string; | |
315 | else | |
316 | { | |
317 | name = bfd_elf_string_from_elf_section (input_bfd, | |
318 | symtab_hdr->sh_link, | |
319 | sym->st_name); | |
320 | if (name == NULL) | |
321 | return false; | |
322 | if (*name == '\0') | |
323 | name = bfd_section_name (input_bfd, sec); | |
324 | } | |
325 | if (! ((*info->callbacks->reloc_overflow) | |
326 | (info, name, howto->name, (bfd_vma) 0, | |
327 | input_bfd, input_section, rel->r_offset))) | |
328 | return false; | |
329 | } | |
330 | break; | |
331 | } | |
332 | } | |
8d88c4ca NC |
333 | } |
334 | return true; | |
335 | } | |
336 | ||
8d88c4ca NC |
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 | |
347 | ||
348 | #include "elf64-target.h" |