1 /* Intel i386 Mach-O support for BFD.
2 Copyright (C) 2009-2021 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/reloc.h"
27
28 #define bfd_mach_o_object_p bfd_mach_o_i386_object_p
29 #define bfd_mach_o_core_p bfd_mach_o_i386_core_p
30 #define bfd_mach_o_mkobject bfd_mach_o_i386_mkobject
31
32 static bfd_cleanup
bfd_mach_o_i386_object_p(bfd * abfd)33 bfd_mach_o_i386_object_p (bfd *abfd)
34 {
35 return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_I386);
36 }
37
38 static bfd_cleanup
bfd_mach_o_i386_core_p(bfd * abfd)39 bfd_mach_o_i386_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_I386);
43 }
44
45 static bool
bfd_mach_o_i386_mkobject(bfd * abfd)46 bfd_mach_o_i386_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;
55 mdata->header.cputype = BFD_MACH_O_CPU_TYPE_I386;
56 mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_X86_ALL;
57 mdata->header.byteorder = BFD_ENDIAN_LITTLE;
58 mdata->header.version = 1;
59
60 return true;
61 }
62
63 static reloc_howto_type i386_howto_table[]=
64 {
65 /* 0 */
66 HOWTO(BFD_RELOC_32, 0, 2, 32, false, 0,
67 complain_overflow_bitfield,
68 NULL, "32",
69 false, 0xffffffff, 0xffffffff, false),
70 HOWTO(BFD_RELOC_16, 0, 1, 16, false, 0,
71 complain_overflow_bitfield,
72 NULL, "16",
73 false, 0xffff, 0xffff, false),
74 HOWTO(BFD_RELOC_8, 0, 0, 8, false, 0,
75 complain_overflow_bitfield,
76 NULL, "8",
77 false, 0xff, 0xff, false),
78 HOWTO(BFD_RELOC_32_PCREL, 0, 2, 32, true, 0,
79 complain_overflow_bitfield,
80 NULL, "DISP32",
81 false, 0xffffffff, 0xffffffff, true),
82 /* 4 */
83 HOWTO(BFD_RELOC_16_PCREL, 0, 1, 16, true, 0,
84 complain_overflow_bitfield,
85 NULL, "DISP16",
86 false, 0xffff, 0xffff, true),
87 HOWTO(BFD_RELOC_MACH_O_SECTDIFF, 0, 2, 32, false, 0,
88 complain_overflow_bitfield,
89 NULL, "SECTDIFF_32",
90 false, 0xffffffff, 0xffffffff, false),
91 HOWTO(BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 2, 32, false, 0,
92 complain_overflow_bitfield,
93 NULL, "LSECTDIFF_32",
94 false, 0xffffffff, 0xffffffff, false),
95 HOWTO(BFD_RELOC_MACH_O_PAIR, 0, 2, 32, false, 0,
96 complain_overflow_bitfield,
97 NULL, "PAIR_32",
98 false, 0xffffffff, 0xffffffff, false),
99 /* 8 */
100 HOWTO(BFD_RELOC_MACH_O_SECTDIFF, 0, 1, 16, false, 0,
101 complain_overflow_bitfield,
102 NULL, "SECTDIFF_16",
103 false, 0xffff, 0xffff, false),
104 HOWTO(BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 1, 16, false, 0,
105 complain_overflow_bitfield,
106 NULL, "LSECTDIFF_16",
107 false, 0xffff, 0xffff, false),
108 HOWTO(BFD_RELOC_MACH_O_PAIR, 0, 1, 16, false, 0,
109 complain_overflow_bitfield,
110 NULL, "PAIR_16",
111 false, 0xffff, 0xffff, false),
112 };
113
114 static bool
bfd_mach_o_i386_canonicalize_one_reloc(bfd * abfd,struct mach_o_reloc_info_external * raw,arelent * res,asymbol ** syms,arelent * res_base)115 bfd_mach_o_i386_canonicalize_one_reloc (bfd * abfd,
116 struct mach_o_reloc_info_external * raw,
117 arelent * res,
118 asymbol ** syms,
119 arelent * res_base)
120 {
121 bfd_mach_o_reloc_info reloc;
122
123 if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms))
124 return false;
125
126 if (reloc.r_scattered)
127 {
128 switch (reloc.r_type)
129 {
130 case BFD_MACH_O_GENERIC_RELOC_PAIR:
131 /* PR 21813: Check for a corrupt PAIR reloc at the start. */
132 if (res == res_base)
133 return false;
134 if (reloc.r_length == 2)
135 {
136 res->howto = &i386_howto_table[7];
137 res->address = res[-1].address;
138 return true;
139 }
140 else if (reloc.r_length == 1)
141 {
142 res->howto = &i386_howto_table[10];
143 res->address = res[-1].address;
144 return true;
145 }
146 return false;
147 case BFD_MACH_O_GENERIC_RELOC_SECTDIFF:
148 if (reloc.r_length == 2)
149 {
150 res->howto = &i386_howto_table[5];
151 return true;
152 }
153 else if (reloc.r_length == 1)
154 {
155 res->howto = &i386_howto_table[8];
156 return true;
157 }
158 return false;
159 case BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF:
160 if (reloc.r_length == 2)
161 {
162 res->howto = &i386_howto_table[6];
163 return true;
164 }
165 else if (reloc.r_length == 1)
166 {
167 res->howto = &i386_howto_table[9];
168 return true;
169 }
170 return false;
171 default:
172 break;
173 }
174 }
175 else
176 {
177 switch (reloc.r_type)
178 {
179 case BFD_MACH_O_GENERIC_RELOC_VANILLA:
180 switch ((reloc.r_length << 1) | reloc.r_pcrel)
181 {
182 case 0: /* len = 0, pcrel = 0 */
183 res->howto = &i386_howto_table[2];
184 return true;
185 case 2: /* len = 1, pcrel = 0 */
186 res->howto = &i386_howto_table[1];
187 return true;
188 case 3: /* len = 1, pcrel = 1 */
189 res->howto = &i386_howto_table[4];
190 return true;
191 case 4: /* len = 2, pcrel = 0 */
192 res->howto = &i386_howto_table[0];
193 return true;
194 case 5: /* len = 2, pcrel = 1 */
195 res->howto = &i386_howto_table[3];
196 return true;
197 default:
198 return false;
199 }
200 default:
201 break;
202 }
203 }
204 return false;
205 }
206
207 static bool
bfd_mach_o_i386_swap_reloc_out(arelent * rel,bfd_mach_o_reloc_info * rinfo)208 bfd_mach_o_i386_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
209 {
210 rinfo->r_address = rel->address;
211 switch (rel->howto->type)
212 {
213 case BFD_RELOC_32:
214 case BFD_RELOC_32_PCREL:
215 case BFD_RELOC_16:
216 case BFD_RELOC_16_PCREL:
217 case BFD_RELOC_8:
218 rinfo->r_scattered = 0;
219 rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_VANILLA;
220 rinfo->r_pcrel = rel->howto->pc_relative;
221 rinfo->r_length = rel->howto->size; /* Correct in practice. */
222 if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
223 {
224 rinfo->r_extern = 0;
225 rinfo->r_value =
226 (*rel->sym_ptr_ptr)->section->output_section->target_index;
227 }
228 else
229 {
230 rinfo->r_extern = 1;
231 rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
232 }
233 break;
234 case BFD_RELOC_MACH_O_SECTDIFF:
235 rinfo->r_scattered = 1;
236 rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_SECTDIFF;
237 rinfo->r_pcrel = 0;
238 rinfo->r_length = rel->howto->size;
239 rinfo->r_extern = 0;
240 rinfo->r_value = rel->addend;
241 break;
242 case BFD_RELOC_MACH_O_LOCAL_SECTDIFF:
243 rinfo->r_scattered = 1;
244 rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF;
245 rinfo->r_pcrel = 0;
246 rinfo->r_length = rel->howto->size;
247 rinfo->r_extern = 0;
248 rinfo->r_value = rel->addend;
249 break;
250 case BFD_RELOC_MACH_O_PAIR:
251 rinfo->r_address = 0;
252 rinfo->r_scattered = 1;
253 rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_PAIR;
254 rinfo->r_pcrel = 0;
255 rinfo->r_length = rel->howto->size;
256 rinfo->r_extern = 0;
257 rinfo->r_value = rel->addend;
258 break;
259 default:
260 return false;
261 }
262 return true;
263 }
264
265 static reloc_howto_type *
bfd_mach_o_i386_bfd_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)266 bfd_mach_o_i386_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
267 bfd_reloc_code_real_type code)
268 {
269 unsigned int i;
270
271 for (i = 0; i < sizeof (i386_howto_table) / sizeof (*i386_howto_table); i++)
272 if (code == i386_howto_table[i].type)
273 return &i386_howto_table[i];
274 return NULL;
275 }
276
277 static reloc_howto_type *
bfd_mach_o_i386_bfd_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * name ATTRIBUTE_UNUSED)278 bfd_mach_o_i386_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
279 const char *name ATTRIBUTE_UNUSED)
280 {
281 return NULL;
282 }
283
284 static bool
bfd_mach_o_i386_print_thread(bfd * abfd,bfd_mach_o_thread_flavour * thread,void * vfile,char * buf)285 bfd_mach_o_i386_print_thread (bfd *abfd, bfd_mach_o_thread_flavour *thread,
286 void *vfile, char *buf)
287 {
288 FILE *file = (FILE *)vfile;
289
290 switch (thread->flavour)
291 {
292 case BFD_MACH_O_x86_THREAD_STATE:
293 if (thread->size < (8 + 16 * 4))
294 return false;
295 fprintf (file, " x86_THREAD_STATE:\n");
296 fprintf (file, " flavor: 0x%08lx count: 0x%08lx\n",
297 (unsigned long)bfd_get_32 (abfd, buf + 0),
298 (unsigned long)bfd_get_32 (abfd, buf + 4));
299 fprintf (file, " eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n",
300 (unsigned long)bfd_get_32 (abfd, buf + 8),
301 (unsigned long)bfd_get_32 (abfd, buf + 12),
302 (unsigned long)bfd_get_32 (abfd, buf + 16),
303 (unsigned long)bfd_get_32 (abfd, buf + 20));
304 fprintf (file, " edi: %08lx esi: %08lx ebp: %08lx esp: %08lx\n",
305 (unsigned long)bfd_get_32 (abfd, buf + 24),
306 (unsigned long)bfd_get_32 (abfd, buf + 28),
307 (unsigned long)bfd_get_32 (abfd, buf + 32),
308 (unsigned long)bfd_get_32 (abfd, buf + 36));
309 fprintf (file, " ss: %08lx flg: %08lx eip: %08lx cs: %08lx\n",
310 (unsigned long)bfd_get_32 (abfd, buf + 40),
311 (unsigned long)bfd_get_32 (abfd, buf + 44),
312 (unsigned long)bfd_get_32 (abfd, buf + 48),
313 (unsigned long)bfd_get_32 (abfd, buf + 52));
314 fprintf (file, " ds: %08lx es: %08lx fs: %08lx gs: %08lx\n",
315 (unsigned long)bfd_get_32 (abfd, buf + 56),
316 (unsigned long)bfd_get_32 (abfd, buf + 60),
317 (unsigned long)bfd_get_32 (abfd, buf + 64),
318 (unsigned long)bfd_get_32 (abfd, buf + 68));
319 return true;
320 case BFD_MACH_O_x86_FLOAT_STATE:
321 if (thread->size < 8)
322 return false;
323 fprintf (file, " x86_FLOAT_STATE:\n");
324 fprintf (file, " flavor: 0x%08lx count: 0x%08lx\n",
325 (unsigned long)bfd_get_32 (abfd, buf + 0),
326 (unsigned long)bfd_get_32 (abfd, buf + 4));
327 return true;
328 case BFD_MACH_O_x86_EXCEPTION_STATE:
329 if (thread->size < 8 + 3 * 4)
330 return false;
331 fprintf (file, " x86_EXCEPTION_STATE:\n");
332 fprintf (file, " flavor: 0x%08lx count: 0x%08lx\n",
333 (unsigned long)bfd_get_32 (abfd, buf + 0),
334 (unsigned long)bfd_get_32 (abfd, buf + 4));
335 fprintf (file, " trapno: %08lx err: %08lx faultaddr: %08lx\n",
336 (unsigned long)bfd_get_32 (abfd, buf + 8),
337 (unsigned long)bfd_get_32 (abfd, buf + 12),
338 (unsigned long)bfd_get_32 (abfd, buf + 16));
339 return true;
340 default:
341 break;
342 }
343 return false;
344 }
345
346 static const mach_o_section_name_xlat text_section_names_xlat[] =
347 {
348 { ".symbol_stub", "__symbol_stub",
349 SEC_CODE | SEC_LOAD, BFD_MACH_O_S_SYMBOL_STUBS,
350 BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
351 0},
352 { ".picsymbol_stub", "__picsymbol_stub",
353 SEC_CODE | SEC_LOAD, BFD_MACH_O_S_SYMBOL_STUBS,
354 BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
355 0},
356 { NULL, NULL, 0, 0, 0, 0}
357 };
358
359 static const mach_o_section_name_xlat data_section_names_xlat[] =
360 {
361 /* The first two are recognized by i386, but not emitted for x86 by
362 modern GCC. */
363 { ".non_lazy_symbol_pointer", "__nl_symbol_ptr",
364 SEC_DATA | SEC_LOAD, BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
365 BFD_MACH_O_S_ATTR_NONE, 2},
366 { ".lazy_symbol_pointer", "__la_symbol_ptr",
367 SEC_DATA | SEC_LOAD, BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
368 BFD_MACH_O_S_ATTR_NONE, 2},
369 { ".lazy_symbol_pointer2", "__la_sym_ptr2",
370 SEC_DATA | SEC_LOAD, BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
371 BFD_MACH_O_S_ATTR_NONE, 2},
372 { ".lazy_symbol_pointer3", "__la_sym_ptr3",
373 SEC_DATA | SEC_LOAD, BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
374 BFD_MACH_O_S_ATTR_NONE, 2},
375 { NULL, NULL, 0, 0, 0, 0}
376 };
377
378 static const mach_o_section_name_xlat import_section_names_xlat[] =
379 {
380 { ".picsymbol_stub3", "__jump_table",
381 SEC_CODE | SEC_LOAD, BFD_MACH_O_S_SYMBOL_STUBS,
382 BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS
383 | BFD_MACH_O_S_SELF_MODIFYING_CODE,
384 6},
385 { ".non_lazy_symbol_pointer_x86", "__pointers",
386 SEC_DATA | SEC_LOAD, BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
387 BFD_MACH_O_S_ATTR_NONE, 2},
388 { NULL, NULL, 0, 0, 0, 0}
389 };
390
391 const mach_o_segment_name_xlat mach_o_i386_segsec_names_xlat[] =
392 {
393 { "__TEXT", text_section_names_xlat },
394 { "__DATA", data_section_names_xlat },
395 { "__IMPORT", import_section_names_xlat },
396 { NULL, NULL }
397 };
398
399 #define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_i386_canonicalize_one_reloc
400 #define bfd_mach_o_swap_reloc_out bfd_mach_o_i386_swap_reloc_out
401 #define bfd_mach_o_print_thread bfd_mach_o_i386_print_thread
402
403 #define bfd_mach_o_tgt_seg_table mach_o_i386_segsec_names_xlat
404 #define bfd_mach_o_section_type_valid_for_tgt NULL
405
406 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_i386_bfd_reloc_type_lookup
407 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_i386_bfd_reloc_name_lookup
408
409 #define TARGET_NAME i386_mach_o_vec
410 #define TARGET_STRING "mach-o-i386"
411 #define TARGET_ARCHITECTURE bfd_arch_i386
412 #define TARGET_PAGESIZE 4096
413 #define TARGET_BIG_ENDIAN 0
414 #define TARGET_ARCHIVE 0
415 #define TARGET_PRIORITY 0
416 #include "mach-o-target.c"
417