1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
|
/* ARM Mach-O support for BFD.
Copyright (C) 2015-2021 Free Software Foundation, Inc.
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "libiberty.h"
#include "mach-o.h"
#include "mach-o/arm.h"
#define bfd_mach_o_object_p bfd_mach_o_arm_object_p
#define bfd_mach_o_core_p bfd_mach_o_arm_core_p
#define bfd_mach_o_mkobject bfd_mach_o_arm_mkobject
#define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_arm_canonicalize_one_reloc
#define bfd_mach_o_swap_reloc_out NULL
#define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_arm_bfd_reloc_type_lookup
#define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_arm_bfd_reloc_name_lookup
#define bfd_mach_o_print_thread NULL
#define bfd_mach_o_tgt_seg_table NULL
#define bfd_mach_o_section_type_valid_for_tgt NULL
static bfd_cleanup
bfd_mach_o_arm_object_p (bfd *abfd)
{
return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_ARM);
}
static bfd_cleanup
bfd_mach_o_arm_core_p (bfd *abfd)
{
return bfd_mach_o_header_p (abfd, 0,
BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_ARM);
}
static bool
bfd_mach_o_arm_mkobject (bfd *abfd)
{
bfd_mach_o_data_struct *mdata;
if (!bfd_mach_o_mkobject_init (abfd))
return false;
mdata = bfd_mach_o_get_data (abfd);
mdata->header.magic = BFD_MACH_O_MH_MAGIC;
mdata->header.cputype = BFD_MACH_O_CPU_TYPE_ARM;
mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_ARM_ALL;
mdata->header.byteorder = BFD_ENDIAN_LITTLE;
mdata->header.version = 1;
return true;
}
static reloc_howto_type arm_howto_table[]=
{
/* 0 */
HOWTO (BFD_RELOC_32, 0, 2, 32, false, 0,
complain_overflow_bitfield,
NULL, "32",
false, 0xffffffff, 0xffffffff, false),
HOWTO (BFD_RELOC_16, 0, 1, 16, false, 0,
complain_overflow_bitfield,
NULL, "16",
false, 0xffff, 0xffff, false),
HOWTO (BFD_RELOC_8, 0, 0, 8, false, 0,
complain_overflow_bitfield,
NULL, "8",
false, 0xff, 0xff, false),
HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, true, 0,
complain_overflow_bitfield,
NULL, "DISP32",
false, 0xffffffff, 0xffffffff, true),
/* 4 */
HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, true, 0,
complain_overflow_bitfield,
NULL, "DISP16",
false, 0xffff, 0xffff, true),
HOWTO (BFD_RELOC_MACH_O_SECTDIFF, 0, 2, 32, false, 0,
complain_overflow_bitfield,
NULL, "SECTDIFF_32",
false, 0xffffffff, 0xffffffff, false),
HOWTO (BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 2, 32, false, 0,
complain_overflow_bitfield,
NULL, "LSECTDIFF_32",
false, 0xffffffff, 0xffffffff, false),
HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 32, false, 0,
complain_overflow_bitfield,
NULL, "PAIR_32",
false, 0xffffffff, 0xffffffff, false),
/* 8 */
HOWTO (BFD_RELOC_MACH_O_SECTDIFF, 0, 1, 16, false, 0,
complain_overflow_bitfield,
NULL, "SECTDIFF_16",
false, 0xffff, 0xffff, false),
HOWTO (BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 1, 16, false, 0,
complain_overflow_bitfield,
NULL, "LSECTDIFF_16",
false, 0xffff, 0xffff, false),
HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 1, 16, false, 0,
complain_overflow_bitfield,
NULL, "PAIR_16",
false, 0xffff, 0xffff, false),
HOWTO (BFD_RELOC_ARM_PCREL_CALL, 2, 2, 24, true, 0,
complain_overflow_signed,
NULL, "BR24",
false, 0x00ffffff, 0x00ffffff, true),
/* 12 */
HOWTO (BFD_RELOC_ARM_MOVW, 0, 2, 16, false, 0,
complain_overflow_dont,
NULL, "MOVW",
false, 0x000f0fff, 0x000f0fff, false),
HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 16, false, 0,
complain_overflow_bitfield,
NULL, "PAIR_W",
false, 0x000f0fff, 0x000f0fff, false),
HOWTO (BFD_RELOC_ARM_MOVT, 0, 2, 16, false, 0,
complain_overflow_bitfield,
NULL, "MOVT",
false, 0x000f0fff, 0x000f0fff, false),
HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 16, false, 0,
complain_overflow_bitfield,
NULL, "PAIR_T",
false, 0x000f0fff, 0x000f0fff, false),
/* 16 */
HOWTO (BFD_RELOC_THUMB_PCREL_BLX, 2, 2, 24, true, 0,
complain_overflow_signed,
NULL, "TBR22",
false, 0x07ff2fff, 0x07ff2fff, true)
};
static bool
bfd_mach_o_arm_canonicalize_one_reloc (bfd * abfd,
struct mach_o_reloc_info_external * raw,
arelent * res,
asymbol ** syms,
arelent * res_base)
{
bfd_mach_o_reloc_info reloc;
if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms))
return false;
if (reloc.r_scattered)
{
switch (reloc.r_type)
{
case BFD_MACH_O_ARM_RELOC_PAIR:
/* PR 21813: Check for a corrupt PAIR reloc at the start. */
if (res == res_base)
{
_bfd_error_handler (_("malformed mach-o ARM reloc pair: "
"reloc is first reloc"));
return false;
}
if (reloc.r_length == 2)
{
res->howto = &arm_howto_table[7];
res->address = res[-1].address;
return true;
}
else if (reloc.r_length == 1)
{
res->howto = &arm_howto_table[10];
res->address = res[-1].address;
return true;
}
_bfd_error_handler (_("malformed mach-o ARM reloc pair: "
"invalid length: %d"), reloc.r_length);
return false;
case BFD_MACH_O_ARM_RELOC_SECTDIFF:
if (reloc.r_length == 2)
{
res->howto = &arm_howto_table[5];
return true;
}
else if (reloc.r_length == 1)
{
res->howto = &arm_howto_table[8];
return true;
}
_bfd_error_handler (_("malformed mach-o ARM sectdiff reloc: "
"invalid length: %d"), reloc.r_length);
return false;
case BFD_MACH_O_ARM_RELOC_LOCAL_SECTDIFF:
if (reloc.r_length == 2)
{
res->howto = &arm_howto_table[6];
return true;
}
else if (reloc.r_length == 1)
{
res->howto = &arm_howto_table[9];
return true;
}
_bfd_error_handler (_("malformed mach-o ARM local sectdiff reloc: "
"invalid length: %d"),
reloc.r_length);
return false;
case BFD_MACH_O_ARM_RELOC_HALF_SECTDIFF:
switch (reloc.r_length)
{
case 2: /* :lower16: for movw arm. */
res->howto = &arm_howto_table[12];
return true;
case 3: /* :upper16: for movt arm. */
res->howto = &arm_howto_table[14];
return true;
}
_bfd_error_handler (_("malformed mach-o ARM half sectdiff reloc: "
"invalid length: %d"),
reloc.r_length);
return false;
default:
break;
}
}
else
{
switch (reloc.r_type)
{
case BFD_MACH_O_ARM_RELOC_VANILLA:
switch ((reloc.r_length << 1) | reloc.r_pcrel)
{
case 0: /* len = 0, pcrel = 0 */
res->howto = &arm_howto_table[2];
return true;
case 2: /* len = 1, pcrel = 0 */
res->howto = &arm_howto_table[1];
return true;
case 3: /* len = 1, pcrel = 1 */
res->howto = &arm_howto_table[4];
return true;
case 4: /* len = 2, pcrel = 0 */
res->howto = &arm_howto_table[0];
return true;
case 5: /* len = 2, pcrel = 1 */
res->howto = &arm_howto_table[3];
return true;
default:
_bfd_error_handler (_("malformed mach-o ARM vanilla reloc: "
"invalid length: %d (pcrel: %d)"),
reloc.r_length, reloc.r_pcrel);
return false;
}
break;
case BFD_MACH_O_ARM_RELOC_BR24:
if (reloc.r_length == 2 && reloc.r_pcrel == 1)
{
res->howto = &arm_howto_table[11];
return true;
}
break;
case BFD_MACH_O_THUMB_RELOC_BR22:
if (reloc.r_length == 2 && reloc.r_pcrel == 1)
{
res->howto = &arm_howto_table[16];
return true;
}
break;
case BFD_MACH_O_ARM_RELOC_HALF:
if (reloc.r_pcrel == 0)
switch (reloc.r_length)
{
case 0: /* :lower16: for movw arm. */
res->howto = &arm_howto_table[12];
return true;
case 1: /* :upper16: for movt arm. */
res->howto = &arm_howto_table[14];
return true;
}
break;
case BFD_MACH_O_ARM_RELOC_PAIR:
if (res == res_base)
{
_bfd_error_handler (_("malformed mach-o ARM reloc pair: "
"reloc is first reloc"));
return false;
}
if (res[-1].howto == &arm_howto_table[12]
&& reloc.r_length == 0)
{
/* Pair for :lower16: of movw arm. */
res->howto = &arm_howto_table[13];
/* This reloc contains the other half in its r_address field. */
res[-1].addend += (res->address & 0xffff) << 16;
res->address = res[-1].address;
return true;
}
else if (res[-1].howto == &arm_howto_table[14]
&& reloc.r_length == 1)
{
/* Pair for :upper16: of movt arm. */
res->howto = &arm_howto_table[15];
/* This reloc contains the other half in its r_address field. */
res[-1].addend += res->address & 0xffff;
res->address = res[-1].address;
return true;
}
break;
default:
break;
}
}
_bfd_error_handler (_("malformed mach-o ARM reloc: "
"unknown reloc type: %d"), reloc.r_length);
return false;
}
static reloc_howto_type *
bfd_mach_o_arm_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = 0; i < sizeof (arm_howto_table) / sizeof (*arm_howto_table); i++)
if (code == arm_howto_table[i].type)
return &arm_howto_table[i];
return NULL;
}
static reloc_howto_type *
bfd_mach_o_arm_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *name ATTRIBUTE_UNUSED)
{
return NULL;
}
#define TARGET_NAME arm_mach_o_vec
#define TARGET_STRING "mach-o-arm"
#define TARGET_ARCHITECTURE bfd_arch_arm
#define TARGET_PAGESIZE 4096
#define TARGET_BIG_ENDIAN 0
#define TARGET_ARCHIVE 0
#define TARGET_PRIORITY 0
#include "mach-o-target.c"
|
