1 /* AArch-64 Mach-O support for BFD.
2 Copyright (C) 2015-2021 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/arm64.h"
27
28 #define bfd_mach_o_object_p bfd_mach_o_arm64_object_p
29 #define bfd_mach_o_core_p bfd_mach_o_arm64_core_p
30 #define bfd_mach_o_mkobject bfd_mach_o_arm64_mkobject
31
32 #define bfd_mach_o_canonicalize_one_reloc \
33 bfd_mach_o_arm64_canonicalize_one_reloc
34 #define bfd_mach_o_swap_reloc_out NULL
35
36 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_arm64_bfd_reloc_type_lookup
37 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_arm64_bfd_reloc_name_lookup
38
39 #define bfd_mach_o_print_thread NULL
40 #define bfd_mach_o_tgt_seg_table NULL
41 #define bfd_mach_o_section_type_valid_for_tgt NULL
42
43 static bfd_cleanup
bfd_mach_o_arm64_object_p(bfd * abfd)44 bfd_mach_o_arm64_object_p (bfd *abfd)
45 {
46 return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_ARM64);
47 }
48
49 static bfd_cleanup
bfd_mach_o_arm64_core_p(bfd * abfd)50 bfd_mach_o_arm64_core_p (bfd *abfd)
51 {
52 return bfd_mach_o_header_p (abfd, 0,
53 BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_ARM64);
54 }
55
56 static bool
bfd_mach_o_arm64_mkobject(bfd * abfd)57 bfd_mach_o_arm64_mkobject (bfd *abfd)
58 {
59 bfd_mach_o_data_struct *mdata;
60
61 if (!bfd_mach_o_mkobject_init (abfd))
62 return false;
63
64 mdata = bfd_mach_o_get_data (abfd);
65 mdata->header.magic = BFD_MACH_O_MH_MAGIC;
66 mdata->header.cputype = BFD_MACH_O_CPU_TYPE_ARM64;
67 mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_ARM64_ALL;
68 mdata->header.byteorder = BFD_ENDIAN_LITTLE;
69 mdata->header.version = 1;
70
71 return true;
72 }
73
74 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
75 #define MINUS_ONE (~ (bfd_vma) 0)
76
77 static reloc_howto_type arm64_howto_table[]=
78 {
79 /* 0 */
80 HOWTO (BFD_RELOC_64, 0, 4, 64, false, 0,
81 complain_overflow_bitfield,
82 NULL, "64",
83 false, MINUS_ONE, MINUS_ONE, false),
84 HOWTO (BFD_RELOC_32, 0, 2, 32, false, 0,
85 complain_overflow_bitfield,
86 NULL, "32",
87 false, 0xffffffff, 0xffffffff, false),
88 HOWTO (BFD_RELOC_16, 0, 1, 16, false, 0,
89 complain_overflow_bitfield,
90 NULL, "16",
91 false, 0xffff, 0xffff, false),
92 HOWTO (BFD_RELOC_8, 0, 0, 8, false, 0,
93 complain_overflow_bitfield,
94 NULL, "8",
95 false, 0xff, 0xff, false),
96 /* 4 */
97 HOWTO (BFD_RELOC_64_PCREL, 0, 4, 64, true, 0,
98 complain_overflow_bitfield,
99 NULL, "DISP64",
100 false, MINUS_ONE, MINUS_ONE, true),
101 HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, true, 0,
102 complain_overflow_bitfield,
103 NULL, "DISP32",
104 false, 0xffffffff, 0xffffffff, true),
105 HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, true, 0,
106 complain_overflow_bitfield,
107 NULL, "DISP16",
108 false, 0xffff, 0xffff, true),
109 HOWTO (BFD_RELOC_AARCH64_CALL26, 0, 2, 26, true, 0,
110 complain_overflow_bitfield,
111 NULL, "BRANCH26",
112 false, 0x03ffffff, 0x03ffffff, true),
113 /* 8 */
114 HOWTO (BFD_RELOC_AARCH64_ADR_HI21_PCREL, 12, 2, 21, true, 0,
115 complain_overflow_signed,
116 NULL, "PAGE21",
117 false, 0x1fffff, 0x1fffff, true),
118 HOWTO (BFD_RELOC_AARCH64_LDST16_LO12, 1, 2, 12, true, 0,
119 complain_overflow_signed,
120 NULL, "PGOFF12",
121 false, 0xffe, 0xffe, true),
122 HOWTO (BFD_RELOC_MACH_O_ARM64_ADDEND, 0, 2, 32, false, 0,
123 complain_overflow_signed,
124 NULL, "ADDEND",
125 false, 0xffffffff, 0xffffffff, false),
126 HOWTO (BFD_RELOC_MACH_O_SUBTRACTOR32, 0, 2, 32, false, 0,
127 complain_overflow_bitfield,
128 NULL, "SUBTRACTOR32",
129 false, 0xffffffff, 0xffffffff, false),
130 /* 12 */
131 HOWTO (BFD_RELOC_MACH_O_SUBTRACTOR64, 0, 4, 64, false, 0,
132 complain_overflow_bitfield,
133 NULL, "SUBTRACTOR64",
134 false, MINUS_ONE, MINUS_ONE, false),
135 HOWTO (BFD_RELOC_MACH_O_ARM64_GOT_LOAD_PAGE21, 12, 2, 21, true, 0,
136 complain_overflow_signed,
137 NULL, "GOT_LD_PG21",
138 false, 0x1fffff, 0x1fffff, true),
139 HOWTO (BFD_RELOC_MACH_O_ARM64_GOT_LOAD_PAGEOFF12, 1, 2, 12, true, 0,
140 complain_overflow_signed,
141 NULL, "GOT_LD_PGOFF12",
142 false, 0xffe, 0xffe, true),
143 HOWTO (BFD_RELOC_MACH_O_ARM64_POINTER_TO_GOT, 0, 2, 32, true, 0,
144 complain_overflow_bitfield,
145 NULL, "PTR_TO_GOT",
146 false, 0xffffffff, 0xffffffff, true),
147 };
148
149 static bool
bfd_mach_o_arm64_canonicalize_one_reloc(bfd * abfd,struct mach_o_reloc_info_external * raw,arelent * res,asymbol ** syms,arelent * res_base ATTRIBUTE_UNUSED)150 bfd_mach_o_arm64_canonicalize_one_reloc (bfd * abfd,
151 struct mach_o_reloc_info_external * raw,
152 arelent * res,
153 asymbol ** syms,
154 arelent * res_base ATTRIBUTE_UNUSED)
155 {
156 bfd_mach_o_reloc_info reloc;
157
158 res->address = bfd_get_32 (abfd, raw->r_address);
159 if (res->address & BFD_MACH_O_SR_SCATTERED)
160 {
161 /* Only non-scattered relocations. */
162 return false;
163 }
164
165 /* The value and info fields have to be extracted dependent on target
166 endian-ness. */
167 bfd_mach_o_swap_in_non_scattered_reloc (abfd, &reloc, raw->r_symbolnum);
168
169 if (reloc.r_type == BFD_MACH_O_ARM64_RELOC_ADDEND)
170 {
171 if (reloc.r_length == 2 && reloc.r_pcrel == 0)
172 {
173 res->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
174 res->addend = reloc.r_value;
175 res->howto = &arm64_howto_table[10];
176 return true;
177 }
178 return false;
179 }
180
181 if (!bfd_mach_o_canonicalize_non_scattered_reloc (abfd, &reloc, res, syms))
182 return false;
183
184 switch (reloc.r_type)
185 {
186 case BFD_MACH_O_ARM64_RELOC_UNSIGNED:
187 switch ((reloc.r_length << 1) | reloc.r_pcrel)
188 {
189 case 0: /* len = 0, pcrel = 0 */
190 res->howto = &arm64_howto_table[3];
191 return true;
192 case 2: /* len = 1, pcrel = 0 */
193 res->howto = &arm64_howto_table[2];
194 return true;
195 case 3: /* len = 1, pcrel = 1 */
196 res->howto = &arm64_howto_table[6];
197 return true;
198 case 4: /* len = 2, pcrel = 0 */
199 res->howto = &arm64_howto_table[1];
200 return true;
201 case 5: /* len = 2, pcrel = 1 */
202 res->howto = &arm64_howto_table[5];
203 return true;
204 case 6: /* len = 3, pcrel = 0 */
205 res->howto = &arm64_howto_table[0];
206 return true;
207 case 7: /* len = 3, pcrel = 1 */
208 res->howto = &arm64_howto_table[4];
209 return true;
210 default:
211 return false;
212 }
213 break;
214 case BFD_MACH_O_ARM64_RELOC_SUBTRACTOR:
215 if (reloc.r_pcrel)
216 return false;
217 switch (reloc.r_length)
218 {
219 case 2:
220 res->howto = &arm64_howto_table[11];
221 return true;
222 case 3:
223 res->howto = &arm64_howto_table[12];
224 return true;
225 default:
226 return false;
227 }
228 break;
229 case BFD_MACH_O_ARM64_RELOC_BRANCH26:
230 if (reloc.r_length == 2 && reloc.r_pcrel == 1)
231 {
232 res->howto = &arm64_howto_table[7];
233 return true;
234 }
235 break;
236 case BFD_MACH_O_ARM64_RELOC_PAGE21:
237 if (reloc.r_length == 2 && reloc.r_pcrel == 1)
238 {
239 res->howto = &arm64_howto_table[8];
240 return true;
241 }
242 break;
243 case BFD_MACH_O_ARM64_RELOC_PAGEOFF12:
244 if (reloc.r_length == 2 && reloc.r_pcrel == 0)
245 {
246 res->howto = &arm64_howto_table[9];
247 return true;
248 }
249 break;
250 case BFD_MACH_O_ARM64_RELOC_GOT_LOAD_PAGE21:
251 if (reloc.r_length == 2 && reloc.r_pcrel == 1)
252 {
253 res->howto = &arm64_howto_table[13];
254 return true;
255 }
256 break;
257 case BFD_MACH_O_ARM64_RELOC_GOT_LOAD_PAGEOFF12:
258 if (reloc.r_length == 2 && reloc.r_pcrel == 0)
259 {
260 res->howto = &arm64_howto_table[14];
261 return true;
262 }
263 break;
264 case BFD_MACH_O_ARM64_RELOC_POINTER_TO_GOT:
265 if (reloc.r_length == 2 && reloc.r_pcrel == 1)
266 {
267 res->howto = &arm64_howto_table[15];
268 return true;
269 }
270 break;
271 default:
272 break;
273 }
274 return false;
275 }
276
277 static reloc_howto_type *
bfd_mach_o_arm64_bfd_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)278 bfd_mach_o_arm64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
279 bfd_reloc_code_real_type code)
280 {
281 unsigned int i;
282
283 for (i = 0;
284 i < sizeof (arm64_howto_table) / sizeof (*arm64_howto_table);
285 i++)
286 if (code == arm64_howto_table[i].type)
287 return &arm64_howto_table[i];
288 return NULL;
289 }
290
291 static reloc_howto_type *
bfd_mach_o_arm64_bfd_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * name ATTRIBUTE_UNUSED)292 bfd_mach_o_arm64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
293 const char *name ATTRIBUTE_UNUSED)
294 {
295 return NULL;
296 }
297
298 #define TARGET_NAME aarch64_mach_o_vec
299 #define TARGET_STRING "mach-o-arm64"
300 #define TARGET_ARCHITECTURE bfd_arch_aarch64
301 #define TARGET_PAGESIZE 4096
302 #define TARGET_BIG_ENDIAN 0
303 #define TARGET_ARCHIVE 0
304 #define TARGET_PRIORITY 0
305 #include "mach-o-target.c"
306
307 #undef TARGET_NAME
308 #undef TARGET_STRING
309 #undef TARGET_ARCHIVE
310 #undef TARGET_PRIORITY
311