| 1 | /* ARM 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/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 * |
| 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 * |
| 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 |
| 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 |
| 150 | bfd_mach_o_arm_canonicalize_one_reloc (bfd * abfd, |
| 151 | struct mach_o_reloc_info_external * raw, |
| 152 | arelent * res, |
| 153 | asymbol ** syms, |
| 154 | arelent * res_base) |
| 155 | { |
| 156 | bfd_mach_o_reloc_info reloc; |
| 157 | |
| 158 | if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms)) |
| 159 | { |
| 160 | fprintf (stderr, "ARm 1\n"); |
| 161 | return FALSE; |
| 162 | } |
| 163 | |
| 164 | if (reloc.r_scattered) |
| 165 | { |
| 166 | switch (reloc.r_type) |
| 167 | { |
| 168 | case BFD_MACH_O_ARM_RELOC_PAIR: |
| 169 | /* PR 21813: Check for a corrupt PAIR reloc at the start. */ |
| 170 | if (res == res_base) |
| 171 | { |
| 172 | _bfd_error_handler (_("\ |
| 173 | malformed mach-o ARM reloc pair: reloc is first reloc")); |
| 174 | return FALSE; |
| 175 | } |
| 176 | if (reloc.r_length == 2) |
| 177 | { |
| 178 | res->howto = &arm_howto_table[7]; |
| 179 | res->address = res[-1].address; |
| 180 | return TRUE; |
| 181 | } |
| 182 | else if (reloc.r_length == 1) |
| 183 | { |
| 184 | res->howto = &arm_howto_table[10]; |
| 185 | res->address = res[-1].address; |
| 186 | return TRUE; |
| 187 | } |
| 188 | _bfd_error_handler (_("\ |
| 189 | malformed mach-o ARM reloc pair: invalid length: %d"), reloc.r_length); |
| 190 | return FALSE; |
| 191 | |
| 192 | case BFD_MACH_O_ARM_RELOC_SECTDIFF: |
| 193 | if (reloc.r_length == 2) |
| 194 | { |
| 195 | res->howto = &arm_howto_table[5]; |
| 196 | return TRUE; |
| 197 | } |
| 198 | else if (reloc.r_length == 1) |
| 199 | { |
| 200 | res->howto = &arm_howto_table[8]; |
| 201 | return TRUE; |
| 202 | } |
| 203 | _bfd_error_handler (_("\ |
| 204 | malformed mach-o ARM sectdiff reloc: invalid length: %d"), reloc.r_length); |
| 205 | return FALSE; |
| 206 | |
| 207 | case BFD_MACH_O_ARM_RELOC_LOCAL_SECTDIFF: |
| 208 | if (reloc.r_length == 2) |
| 209 | { |
| 210 | res->howto = &arm_howto_table[6]; |
| 211 | return TRUE; |
| 212 | } |
| 213 | else if (reloc.r_length == 1) |
| 214 | { |
| 215 | res->howto = &arm_howto_table[9]; |
| 216 | return TRUE; |
| 217 | } |
| 218 | _bfd_error_handler (_("\ |
| 219 | malformed mach-o ARM local sectdiff reloc: invalid length: %d"), |
| 220 | reloc.r_length); |
| 221 | return FALSE; |
| 222 | |
| 223 | case BFD_MACH_O_ARM_RELOC_HALF_SECTDIFF: |
| 224 | switch (reloc.r_length) |
| 225 | { |
| 226 | case 2: /* :lower16: for movw arm. */ |
| 227 | res->howto = &arm_howto_table[12]; |
| 228 | return TRUE; |
| 229 | case 3: /* :upper16: for movt arm. */ |
| 230 | res->howto = &arm_howto_table[14]; |
| 231 | return TRUE; |
| 232 | } |
| 233 | _bfd_error_handler (_("\ |
| 234 | malformed mach-o ARM half sectdiff reloc: invalid length: %d"), |
| 235 | reloc.r_length); |
| 236 | return FALSE; |
| 237 | |
| 238 | default: |
| 239 | break; |
| 240 | } |
| 241 | } |
| 242 | else |
| 243 | { |
| 244 | switch (reloc.r_type) |
| 245 | { |
| 246 | case BFD_MACH_O_ARM_RELOC_VANILLA: |
| 247 | switch ((reloc.r_length << 1) | reloc.r_pcrel) |
| 248 | { |
| 249 | case 0: /* len = 0, pcrel = 0 */ |
| 250 | res->howto = &arm_howto_table[2]; |
| 251 | return TRUE; |
| 252 | case 2: /* len = 1, pcrel = 0 */ |
| 253 | res->howto = &arm_howto_table[1]; |
| 254 | return TRUE; |
| 255 | case 3: /* len = 1, pcrel = 1 */ |
| 256 | res->howto = &arm_howto_table[4]; |
| 257 | return TRUE; |
| 258 | case 4: /* len = 2, pcrel = 0 */ |
| 259 | res->howto = &arm_howto_table[0]; |
| 260 | return TRUE; |
| 261 | case 5: /* len = 2, pcrel = 1 */ |
| 262 | res->howto = &arm_howto_table[3]; |
| 263 | return TRUE; |
| 264 | default: |
| 265 | _bfd_error_handler (_("\ |
| 266 | malformed mach-o ARM vanilla reloc: invalid length: %d (pcrel: %d)"), |
| 267 | reloc.r_length, reloc.r_pcrel); |
| 268 | return FALSE; |
| 269 | } |
| 270 | break; |
| 271 | |
| 272 | case BFD_MACH_O_ARM_RELOC_BR24: |
| 273 | if (reloc.r_length == 2 && reloc.r_pcrel == 1) |
| 274 | { |
| 275 | res->howto = &arm_howto_table[11]; |
| 276 | return TRUE; |
| 277 | } |
| 278 | break; |
| 279 | |
| 280 | case BFD_MACH_O_THUMB_RELOC_BR22: |
| 281 | if (reloc.r_length == 2 && reloc.r_pcrel == 1) |
| 282 | { |
| 283 | res->howto = &arm_howto_table[16]; |
| 284 | return TRUE; |
| 285 | } |
| 286 | break; |
| 287 | |
| 288 | case BFD_MACH_O_ARM_RELOC_HALF: |
| 289 | if (reloc.r_pcrel == 0) |
| 290 | switch (reloc.r_length) |
| 291 | { |
| 292 | case 0: /* :lower16: for movw arm. */ |
| 293 | res->howto = &arm_howto_table[12]; |
| 294 | return TRUE; |
| 295 | case 1: /* :upper16: for movt arm. */ |
| 296 | res->howto = &arm_howto_table[14]; |
| 297 | return TRUE; |
| 298 | } |
| 299 | break; |
| 300 | |
| 301 | case BFD_MACH_O_ARM_RELOC_PAIR: |
| 302 | if (res[-1].howto == &arm_howto_table[12] |
| 303 | && reloc.r_length == 0) |
| 304 | { |
| 305 | /* Pair for :lower16: of movw arm. */ |
| 306 | res->howto = &arm_howto_table[13]; |
| 307 | /* This reloc contains the other half in its r_address field. */ |
| 308 | res[-1].addend += (res->address & 0xffff) << 16; |
| 309 | res->address = res[-1].address; |
| 310 | return TRUE; |
| 311 | } |
| 312 | else if (res[-1].howto == &arm_howto_table[14] |
| 313 | && reloc.r_length == 1) |
| 314 | { |
| 315 | /* Pair for :upper16: of movt arm. */ |
| 316 | res->howto = &arm_howto_table[15]; |
| 317 | /* This reloc contains the other half in its r_address field. */ |
| 318 | res[-1].addend += res->address & 0xffff; |
| 319 | res->address = res[-1].address; |
| 320 | return TRUE; |
| 321 | } |
| 322 | break; |
| 323 | |
| 324 | default: |
| 325 | break; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | _bfd_error_handler (_("\ |
| 330 | malformed mach-o ARM reloc: unknown reloc type: %d"), reloc.r_length); |
| 331 | return FALSE; |
| 332 | } |
| 333 | |
| 334 | static reloc_howto_type * |
| 335 | bfd_mach_o_arm_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 336 | bfd_reloc_code_real_type code) |
| 337 | { |
| 338 | unsigned int i; |
| 339 | |
| 340 | for (i = 0; i < sizeof (arm_howto_table) / sizeof (*arm_howto_table); i++) |
| 341 | if (code == arm_howto_table[i].type) |
| 342 | return &arm_howto_table[i]; |
| 343 | return NULL; |
| 344 | } |
| 345 | |
| 346 | static reloc_howto_type * |
| 347 | bfd_mach_o_arm_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 348 | const char *name ATTRIBUTE_UNUSED) |
| 349 | { |
| 350 | return NULL; |
| 351 | } |
| 352 | |
| 353 | #define TARGET_NAME arm_mach_o_vec |
| 354 | #define TARGET_STRING "mach-o-arm" |
| 355 | #define TARGET_ARCHITECTURE bfd_arch_arm |
| 356 | #define TARGET_PAGESIZE 4096 |
| 357 | #define TARGET_BIG_ENDIAN 0 |
| 358 | #define TARGET_ARCHIVE 0 |
| 359 | #define TARGET_PRIORITY 0 |
| 360 | #include "mach-o-target.c" |