1 /* ARM Mach-O support for BFD.
2 Copyright (C) 2015-2016 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 "mach-o.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "libiberty.h"
26 #include "mach-o/arm.h"
27
28 #define bfd_mach_o_object_p bfd_mach_o_arm_object_p
29 #define bfd_mach_o_core_p bfd_mach_o_arm_core_p
30 #define bfd_mach_o_mkobject bfd_mach_o_arm_mkobject
31
32 #define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_arm_canonicalize_one_reloc
33 #define bfd_mach_o_swap_reloc_out NULL
34 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_arm_bfd_reloc_type_lookup
35 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_arm_bfd_reloc_name_lookup
36
37 #define bfd_mach_o_print_thread NULL
38 #define bfd_mach_o_tgt_seg_table NULL
39 #define bfd_mach_o_section_type_valid_for_tgt NULL
40
41 static const bfd_target *
bfd_mach_o_arm_object_p(bfd * abfd)42 bfd_mach_o_arm_object_p (bfd *abfd)
43 {
44 return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_ARM);
45 }
46
47 static const bfd_target *
bfd_mach_o_arm_core_p(bfd * abfd)48 bfd_mach_o_arm_core_p (bfd *abfd)
49 {
50 return bfd_mach_o_header_p (abfd, 0,
51 BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_ARM);
52 }
53
54 static bfd_boolean
bfd_mach_o_arm_mkobject(bfd * abfd)55 bfd_mach_o_arm_mkobject (bfd *abfd)
56 {
57 bfd_mach_o_data_struct *mdata;
58
59 if (!bfd_mach_o_mkobject_init (abfd))
60 return FALSE;
61
62 mdata = bfd_mach_o_get_data (abfd);
63 mdata->header.magic = BFD_MACH_O_MH_MAGIC;
64 mdata->header.cputype = BFD_MACH_O_CPU_TYPE_ARM;
65 mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_ARM_ALL;
66 mdata->header.byteorder = BFD_ENDIAN_LITTLE;
67 mdata->header.version = 1;
68
69 return TRUE;
70 }
71
72 static reloc_howto_type arm_howto_table[]=
73 {
74 /* 0 */
75 HOWTO (BFD_RELOC_32, 0, 2, 32, FALSE, 0,
76 complain_overflow_bitfield,
77 NULL, "32",
78 FALSE, 0xffffffff, 0xffffffff, FALSE),
79 HOWTO (BFD_RELOC_16, 0, 1, 16, FALSE, 0,
80 complain_overflow_bitfield,
81 NULL, "16",
82 FALSE, 0xffff, 0xffff, FALSE),
83 HOWTO (BFD_RELOC_8, 0, 0, 8, FALSE, 0,
84 complain_overflow_bitfield,
85 NULL, "8",
86 FALSE, 0xff, 0xff, FALSE),
87 HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, TRUE, 0,
88 complain_overflow_bitfield,
89 NULL, "DISP32",
90 FALSE, 0xffffffff, 0xffffffff, TRUE),
91 /* 4 */
92 HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, TRUE, 0,
93 complain_overflow_bitfield,
94 NULL, "DISP16",
95 FALSE, 0xffff, 0xffff, TRUE),
96 HOWTO (BFD_RELOC_MACH_O_SECTDIFF, 0, 2, 32, FALSE, 0,
97 complain_overflow_bitfield,
98 NULL, "SECTDIFF_32",
99 FALSE, 0xffffffff, 0xffffffff, FALSE),
100 HOWTO (BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 2, 32, FALSE, 0,
101 complain_overflow_bitfield,
102 NULL, "LSECTDIFF_32",
103 FALSE, 0xffffffff, 0xffffffff, FALSE),
104 HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 32, FALSE, 0,
105 complain_overflow_bitfield,
106 NULL, "PAIR_32",
107 FALSE, 0xffffffff, 0xffffffff, FALSE),
108 /* 8 */
109 HOWTO (BFD_RELOC_MACH_O_SECTDIFF, 0, 1, 16, FALSE, 0,
110 complain_overflow_bitfield,
111 NULL, "SECTDIFF_16",
112 FALSE, 0xffff, 0xffff, FALSE),
113 HOWTO (BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 1, 16, FALSE, 0,
114 complain_overflow_bitfield,
115 NULL, "LSECTDIFF_16",
116 FALSE, 0xffff, 0xffff, FALSE),
117 HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 1, 16, FALSE, 0,
118 complain_overflow_bitfield,
119 NULL, "PAIR_16",
120 FALSE, 0xffff, 0xffff, FALSE),
121 HOWTO (BFD_RELOC_ARM_PCREL_CALL, 2, 2, 24, TRUE, 0,
122 complain_overflow_signed,
123 NULL, "BR24",
124 FALSE, 0x00ffffff, 0x00ffffff, TRUE),
125 /* 12 */
126 HOWTO (BFD_RELOC_ARM_MOVW, 0, 2, 16, FALSE, 0,
127 complain_overflow_dont,
128 NULL, "MOVW",
129 FALSE, 0x000f0fff, 0x000f0fff, FALSE),
130 HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 16, FALSE, 0,
131 complain_overflow_bitfield,
132 NULL, "PAIR_W",
133 FALSE, 0x000f0fff, 0x000f0fff, FALSE),
134 HOWTO (BFD_RELOC_ARM_MOVT, 0, 2, 16, FALSE, 0,
135 complain_overflow_bitfield,
136 NULL, "MOVT",
137 FALSE, 0x000f0fff, 0x000f0fff, FALSE),
138 HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 16, FALSE, 0,
139 complain_overflow_bitfield,
140 NULL, "PAIR_T",
141 FALSE, 0x000f0fff, 0x000f0fff, FALSE),
142 /* 16 */
143 HOWTO (BFD_RELOC_THUMB_PCREL_BLX, 2, 2, 24, TRUE, 0,
144 complain_overflow_signed,
145 NULL, "TBR22",
146 FALSE, 0x07ff2fff, 0x07ff2fff, TRUE)
147 };
148
149 static bfd_boolean
bfd_mach_o_arm_canonicalize_one_reloc(bfd * abfd,struct mach_o_reloc_info_external * raw,arelent * res,asymbol ** syms)150 bfd_mach_o_arm_canonicalize_one_reloc (bfd *abfd,
151 struct mach_o_reloc_info_external *raw,
152 arelent *res, asymbol **syms)
153 {
154 bfd_mach_o_reloc_info reloc;
155
156 if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms))
157 return FALSE;
158
159 if (reloc.r_scattered)
160 {
161 switch (reloc.r_type)
162 {
163 case BFD_MACH_O_ARM_RELOC_PAIR:
164 if (reloc.r_length == 2)
165 {
166 res->howto = &arm_howto_table[7];
167 res->address = res[-1].address;
168 return TRUE;
169 }
170 else if (reloc.r_length == 1)
171 {
172 res->howto = &arm_howto_table[10];
173 res->address = res[-1].address;
174 return TRUE;
175 }
176 return FALSE;
177 case BFD_MACH_O_ARM_RELOC_SECTDIFF:
178 if (reloc.r_length == 2)
179 {
180 res->howto = &arm_howto_table[5];
181 return TRUE;
182 }
183 else if (reloc.r_length == 1)
184 {
185 res->howto = &arm_howto_table[8];
186 return TRUE;
187 }
188 return FALSE;
189 case BFD_MACH_O_ARM_RELOC_LOCAL_SECTDIFF:
190 if (reloc.r_length == 2)
191 {
192 res->howto = &arm_howto_table[6];
193 return TRUE;
194 }
195 else if (reloc.r_length == 1)
196 {
197 res->howto = &arm_howto_table[9];
198 return TRUE;
199 }
200 return FALSE;
201 case BFD_MACH_O_ARM_RELOC_HALF_SECTDIFF:
202 switch (reloc.r_length)
203 {
204 case 2: /* :lower16: for movw arm. */
205 res->howto = &arm_howto_table[12];
206 return TRUE;
207 case 3: /* :upper16: for movt arm. */
208 res->howto = &arm_howto_table[14];
209 return TRUE;
210 }
211 return FALSE;
212 default:
213 return FALSE;
214 }
215 }
216 else
217 {
218 switch (reloc.r_type)
219 {
220 case BFD_MACH_O_ARM_RELOC_VANILLA:
221 switch ((reloc.r_length << 1) | reloc.r_pcrel)
222 {
223 case 0: /* len = 0, pcrel = 0 */
224 res->howto = &arm_howto_table[2];
225 return TRUE;
226 case 2: /* len = 1, pcrel = 0 */
227 res->howto = &arm_howto_table[1];
228 return TRUE;
229 case 3: /* len = 1, pcrel = 1 */
230 res->howto = &arm_howto_table[4];
231 return TRUE;
232 case 4: /* len = 2, pcrel = 0 */
233 res->howto = &arm_howto_table[0];
234 return TRUE;
235 case 5: /* len = 2, pcrel = 1 */
236 res->howto = &arm_howto_table[3];
237 return TRUE;
238 default:
239 return FALSE;
240 }
241 break;
242 case BFD_MACH_O_ARM_RELOC_BR24:
243 if (reloc.r_length == 2 && reloc.r_pcrel == 1)
244 {
245 res->howto = &arm_howto_table[11];
246 return TRUE;
247 }
248 else
249 return FALSE;
250 break;
251 case BFD_MACH_O_THUMB_RELOC_BR22:
252 if (reloc.r_length == 2 && reloc.r_pcrel == 1)
253 {
254 res->howto = &arm_howto_table[16];
255 return TRUE;
256 }
257 else
258 return FALSE;
259 break;
260 case BFD_MACH_O_ARM_RELOC_HALF:
261 if (reloc.r_pcrel == 0)
262 switch (reloc.r_length)
263 {
264 case 0: /* :lower16: for movw arm. */
265 res->howto = &arm_howto_table[12];
266 return TRUE;
267 case 1: /* :upper16: for movt arm. */
268 res->howto = &arm_howto_table[14];
269 return TRUE;
270 }
271 return FALSE;
272 case BFD_MACH_O_ARM_RELOC_PAIR:
273 if (res[-1].howto == &arm_howto_table[12]
274 && reloc.r_length == 0)
275 {
276 /* Pair for :lower16: of movw arm. */
277 res->howto = &arm_howto_table[13];
278 /* This reloc contains the other half in its r_address field. */
279 res[-1].addend += (res->address & 0xffff) << 16;
280 res->address = res[-1].address;
281 return TRUE;
282 }
283 else if (res[-1].howto == &arm_howto_table[14]
284 && reloc.r_length == 1)
285 {
286 /* Pair for :upper16: of movt arm. */
287 res->howto = &arm_howto_table[15];
288 /* This reloc contains the other half in its r_address field. */
289 res[-1].addend += res->address & 0xffff;
290 res->address = res[-1].address;
291 return TRUE;
292 }
293 return FALSE;
294 default:
295 return FALSE;
296 }
297 }
298 }
299
300 static reloc_howto_type *
bfd_mach_o_arm_bfd_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)301 bfd_mach_o_arm_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
302 bfd_reloc_code_real_type code)
303 {
304 unsigned int i;
305
306 for (i = 0; i < sizeof (arm_howto_table) / sizeof (*arm_howto_table); i++)
307 if (code == arm_howto_table[i].type)
308 return &arm_howto_table[i];
309 return NULL;
310 }
311
312 static reloc_howto_type *
bfd_mach_o_arm_bfd_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * name ATTRIBUTE_UNUSED)313 bfd_mach_o_arm_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
314 const char *name ATTRIBUTE_UNUSED)
315 {
316 return NULL;
317 }
318
319 #define TARGET_NAME arm_mach_o_vec
320 #define TARGET_STRING "mach-o-arm"
321 #define TARGET_ARCHITECTURE bfd_arch_arm
322 #define TARGET_PAGESIZE 4096
323 #define TARGET_BIG_ENDIAN 0
324 #define TARGET_ARCHIVE 0
325 #define TARGET_PRIORITY 0
326 #include "mach-o-target.c"
327