1 /* Intel x86-64 Mach-O support for BFD.
2 Copyright (C) 2010-2023 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "libbfd.h"
24 #include "libiberty.h"
25 #include "mach-o.h"
26 #include "mach-o/x86-64.h"
27
28 #define bfd_mach_o_object_p bfd_mach_o_x86_64_object_p
29 #define bfd_mach_o_core_p bfd_mach_o_x86_64_core_p
30 #define bfd_mach_o_mkobject bfd_mach_o_x86_64_mkobject
31
32 static bfd_cleanup
33 bfd_mach_o_x86_64_object_p (bfd *abfd)
34 {
35 return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_X86_64);
36 }
37
38 static bfd_cleanup
39 bfd_mach_o_x86_64_core_p (bfd *abfd)
40 {
41 return bfd_mach_o_header_p (abfd, 0,
42 BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_X86_64);
43 }
44
45 static bool
46 bfd_mach_o_x86_64_mkobject (bfd *abfd)
47 {
48 bfd_mach_o_data_struct *mdata;
49
50 if (!bfd_mach_o_mkobject_init (abfd))
51 return false;
52
53 mdata = bfd_mach_o_get_data (abfd);
54 mdata->header.magic = BFD_MACH_O_MH_MAGIC_64;
55 mdata->header.cputype = BFD_MACH_O_CPU_TYPE_X86_64;
56 mdata->header.cpusubtype =
57 BFD_MACH_O_CPU_SUBTYPE_X86_ALL | BFD_MACH_O_CPU_SUBTYPE_LIB64;
58 mdata->header.byteorder = BFD_ENDIAN_LITTLE;
59 mdata->header.version = 2;
60
61 return true;
62 }
63
64 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
65 #define MINUS_ONE (~ (bfd_vma) 0)
66
67 static reloc_howto_type x86_64_howto_table[]=
68 {
69 /* 0 */
70 HOWTO(BFD_RELOC_64, 0, 8, 64, false, 0,
71 complain_overflow_bitfield,
72 NULL, "64",
73 false, MINUS_ONE, MINUS_ONE, false),
74 HOWTO(BFD_RELOC_32, 0, 4, 32, false, 0,
75 complain_overflow_bitfield,
76 NULL, "32",
77 false, 0xffffffff, 0xffffffff, false),
78 HOWTO(BFD_RELOC_32_PCREL, 0, 4, 32, true, 0,
79 complain_overflow_bitfield,
80 NULL, "DISP32",
81 false, 0xffffffff, 0xffffffff, true),
82 HOWTO(BFD_RELOC_MACH_O_X86_64_PCREL32_1, 0, 4, 32, true, 0,
83 complain_overflow_bitfield,
84 NULL, "DISP32_1",
85 false, 0xffffffff, 0xffffffff, true),
86 /* 4 */
87 HOWTO(BFD_RELOC_MACH_O_X86_64_PCREL32_2, 0, 4, 32, true, 0,
88 complain_overflow_bitfield,
89 NULL, "DISP32_2",
90 false, 0xffffffff, 0xffffffff, true),
91 HOWTO(BFD_RELOC_MACH_O_X86_64_PCREL32_4, 0, 4, 32, true, 0,
92 complain_overflow_bitfield,
93 NULL, "DISP32_4",
94 false, 0xffffffff, 0xffffffff, true),
95 HOWTO(BFD_RELOC_MACH_O_X86_64_BRANCH32, 0, 4, 32, true, 0,
96 complain_overflow_bitfield,
97 NULL, "BRANCH32",
98 false, 0xffffffff, 0xffffffff, true),
99 HOWTO(BFD_RELOC_MACH_O_X86_64_GOT_LOAD, 0, 4, 32, true, 0,
100 complain_overflow_bitfield,
101 NULL, "GOT_LOAD",
102 false, 0xffffffff, 0xffffffff, true),
103 /* 8 */
104 HOWTO(BFD_RELOC_MACH_O_SUBTRACTOR32, 0, 4, 32, false, 0,
105 complain_overflow_bitfield,
106 NULL, "SUBTRACTOR32",
107 false, 0xffffffff, 0xffffffff, false),
108 HOWTO(BFD_RELOC_MACH_O_SUBTRACTOR64, 0, 8, 64, false, 0,
109 complain_overflow_bitfield,
110 NULL, "SUBTRACTOR64",
111 false, MINUS_ONE, MINUS_ONE, false),
112 HOWTO(BFD_RELOC_MACH_O_X86_64_GOT, 0, 4, 32, true, 0,
113 complain_overflow_bitfield,
114 NULL, "GOT",
115 false, 0xffffffff, 0xffffffff, true),
116 HOWTO(BFD_RELOC_MACH_O_X86_64_BRANCH8, 0, 1, 8, true, 0,
117 complain_overflow_bitfield,
118 NULL, "BRANCH8",
119 false, 0xff, 0xff, true),
120 /* 12 */
121 HOWTO(BFD_RELOC_MACH_O_X86_64_TLV, 0, 4, 32, true, 0,
122 complain_overflow_bitfield,
123 NULL, "TLV",
124 false, 0xffffffff, 0xffffffff, true),
125 };
126
127 static bool
128 bfd_mach_o_x86_64_canonicalize_one_reloc (bfd * abfd,
129 struct mach_o_reloc_info_external * raw,
130 arelent * res,
131 asymbol ** syms,
132 arelent * res_base ATTRIBUTE_UNUSED)
133 {
134 bfd_mach_o_reloc_info reloc;
135
136 if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms))
137 return false;
138
139 /* On x86-64, scattered relocs are not used. */
140 if (reloc.r_scattered)
141 return false;
142
143 switch (reloc.r_type)
144 {
145 case BFD_MACH_O_X86_64_RELOC_UNSIGNED:
146 if (reloc.r_pcrel)
147 return false;
148 switch (reloc.r_length)
149 {
150 case 2:
151 res->howto = &x86_64_howto_table[1];
152 return true;
153 case 3:
154 res->howto = &x86_64_howto_table[0];
155 return true;
156 default:
157 return false;
158 }
159 case BFD_MACH_O_X86_64_RELOC_SIGNED:
160 if (reloc.r_length == 2 && reloc.r_pcrel)
161 {
162 res->howto = &x86_64_howto_table[2];
163 return true;
164 }
165 break;
166 case BFD_MACH_O_X86_64_RELOC_BRANCH:
167 if (!reloc.r_pcrel)
168 return false;
169 switch (reloc.r_length)
170 {
171 case 2:
172 res->howto = &x86_64_howto_table[6];
173 return true;
174 default:
175 return false;
176 }
177 break;
178 case BFD_MACH_O_X86_64_RELOC_GOT_LOAD:
179 if (reloc.r_length == 2 && reloc.r_pcrel && reloc.r_extern)
180 {
181 res->howto = &x86_64_howto_table[7];
182 return true;
183 }
184 break;
185 case BFD_MACH_O_X86_64_RELOC_GOT:
186 if (reloc.r_length == 2 && reloc.r_pcrel && reloc.r_extern)
187 {
188 res->howto = &x86_64_howto_table[10];
189 return true;
190 }
191 break;
192 case BFD_MACH_O_X86_64_RELOC_SUBTRACTOR:
193 if (reloc.r_pcrel)
194 return false;
195 switch (reloc.r_length)
196 {
197 case 2:
198 res->howto = &x86_64_howto_table[8];
199 return true;
200 case 3:
201 res->howto = &x86_64_howto_table[9];
202 return true;
203 default:
204 return false;
205 }
206 break;
207 case BFD_MACH_O_X86_64_RELOC_SIGNED_1:
208 if (reloc.r_length == 2 && reloc.r_pcrel)
209 {
210 res->howto = &x86_64_howto_table[3];
211 return true;
212 }
213 break;
214 case BFD_MACH_O_X86_64_RELOC_SIGNED_2:
215 if (reloc.r_length == 2 && reloc.r_pcrel)
216 {
217 res->howto = &x86_64_howto_table[4];
218 return true;
219 }
220 break;
221 case BFD_MACH_O_X86_64_RELOC_SIGNED_4:
222 if (reloc.r_length == 2 && reloc.r_pcrel)
223 {
224 res->howto = &x86_64_howto_table[5];
225 return true;
226 }
227 break;
228 case BFD_MACH_O_X86_64_RELOC_TLV:
229 if (reloc.r_length == 2 && reloc.r_pcrel && reloc.r_extern)
230 {
231 res->howto = &x86_64_howto_table[12];
232 return true;
233 }
234 break;
235 default:
236 return false;
237 }
238 return false;
239 }
240
241 static bool
242 bfd_mach_o_x86_64_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
243 {
244 rinfo->r_address = rel->address;
245 rinfo->r_scattered = 0;
246 switch (rel->howto->type)
247 {
248 case BFD_RELOC_32:
249 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
250 rinfo->r_pcrel = 0;
251 rinfo->r_length = 2;
252 break;
253 case BFD_RELOC_64:
254 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
255 rinfo->r_pcrel = 0;
256 rinfo->r_length = 3;
257 break;
258 case BFD_RELOC_32_PCREL:
259 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED;
260 rinfo->r_pcrel = 1;
261 rinfo->r_length = 2;
262 break;
263 case BFD_RELOC_MACH_O_X86_64_PCREL32_1:
264 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_1;
265 rinfo->r_pcrel = 1;
266 rinfo->r_length = 2;
267 break;
268 case BFD_RELOC_MACH_O_X86_64_PCREL32_2:
269 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_2;
270 rinfo->r_pcrel = 1;
271 rinfo->r_length = 2;
272 break;
273 case BFD_RELOC_MACH_O_X86_64_PCREL32_4:
274 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_4;
275 rinfo->r_pcrel = 1;
276 rinfo->r_length = 2;
277 break;
278 case BFD_RELOC_MACH_O_X86_64_BRANCH32:
279 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_BRANCH;
280 rinfo->r_pcrel = 1;
281 rinfo->r_length = 2;
282 break;
283 case BFD_RELOC_MACH_O_SUBTRACTOR32:
284 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
285 rinfo->r_pcrel = 0;
286 rinfo->r_length = 2;
287 break;
288 case BFD_RELOC_MACH_O_SUBTRACTOR64:
289 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
290 rinfo->r_pcrel = 0;
291 rinfo->r_length = 3;
292 break;
293 case BFD_RELOC_MACH_O_X86_64_GOT:
294 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT;
295 rinfo->r_pcrel = 1;
296 rinfo->r_length = 2;
297 break;
298 case BFD_RELOC_MACH_O_X86_64_GOT_LOAD:
299 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT_LOAD;
300 rinfo->r_pcrel = 1;
301 rinfo->r_length = 2;
302 break;
303 case BFD_RELOC_MACH_O_X86_64_TLV:
304 rinfo->r_type = BFD_MACH_O_X86_64_RELOC_TLV;
305 rinfo->r_pcrel = 1;
306 rinfo->r_length = 2;
307 break;
308 default:
309 return false;
310 }
311 if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
312 {
313 rinfo->r_extern = 0;
314 rinfo->r_value =
315 (*rel->sym_ptr_ptr)->section->output_section->target_index;
316 }
317 else
318 {
319 rinfo->r_extern = 1;
320 rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
321 }
322 return true;
323 }
324
325 static reloc_howto_type *
326 bfd_mach_o_x86_64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
327 bfd_reloc_code_real_type code)
328 {
329 unsigned int i;
330
331 for (i = 0;
332 i < sizeof (x86_64_howto_table) / sizeof (*x86_64_howto_table);
333 i++)
334 if (code == x86_64_howto_table[i].type)
335 return &x86_64_howto_table[i];
336 return NULL;
337 }
338
339 static reloc_howto_type *
340 bfd_mach_o_x86_64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
341 const char *name ATTRIBUTE_UNUSED)
342 {
343 return NULL;
344 }
345
346 static bool
347 bfd_mach_o_section_type_valid_for_x86_64 (unsigned long val)
348 {
349 if (val == BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS
350 || val == BFD_MACH_O_S_LAZY_SYMBOL_POINTERS
351 || val == BFD_MACH_O_S_SYMBOL_STUBS)
352 return false;
353 return true;
354 }
355
356 /* We want to bump the alignment of some sections. */
357 static const mach_o_section_name_xlat text_section_names_xlat[] =
358 {
359 { ".eh_frame", "__eh_frame",
360 SEC_READONLY | SEC_DATA | SEC_LOAD, BFD_MACH_O_S_COALESCED,
361 BFD_MACH_O_S_ATTR_LIVE_SUPPORT
362 | BFD_MACH_O_S_ATTR_STRIP_STATIC_SYMS
363 | BFD_MACH_O_S_ATTR_NO_TOC, 3},
364 { NULL, NULL, 0, 0, 0, 0}
365 };
366
367 const mach_o_segment_name_xlat mach_o_x86_64_segsec_names_xlat[] =
368 {
369 { "__TEXT", text_section_names_xlat },
370 { NULL, NULL }
371 };
372
373 #define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_x86_64_canonicalize_one_reloc
374 #define bfd_mach_o_swap_reloc_out bfd_mach_o_x86_64_swap_reloc_out
375
376 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_x86_64_bfd_reloc_type_lookup
377 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_x86_64_bfd_reloc_name_lookup
378 #define bfd_mach_o_print_thread NULL
379 #define bfd_mach_o_tgt_seg_table mach_o_x86_64_segsec_names_xlat
380 #define bfd_mach_o_section_type_valid_for_tgt bfd_mach_o_section_type_valid_for_x86_64
381
382 #define TARGET_NAME x86_64_mach_o_vec
383 #define TARGET_STRING "mach-o-x86-64"
384 #define TARGET_ARCHITECTURE bfd_arch_i386
385 #define TARGET_PAGESIZE 4096
386 #define TARGET_BIG_ENDIAN 0
387 #define TARGET_ARCHIVE 0
388 #define TARGET_PRIORITY 0
389 #include "mach-o-target.c"