| 1 | /* AArch-64 Mach-O support for BFD. |
| 2 | Copyright (C) 2015-2020 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 const bfd_target * |
| 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 const bfd_target * |
| 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 bfd_boolean |
| 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 bfd_boolean |
| 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 * |
| 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 * |
| 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 |