1 /* BFD support for the ARM processor 2 Copyright (C) 1994-2016 Free Software Foundation, Inc. 3 Contributed by Richard Earnshaw (rwe (at) pegasus.esprit.ec.org) 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #include "sysdep.h" 23 #include "bfd.h" 24 #include "libbfd.h" 25 #include "libiberty.h" 26 27 /* This routine is provided two arch_infos and works out which ARM 28 machine which would be compatible with both and returns a pointer 29 to its info structure. */ 30 31 static const bfd_arch_info_type * 32 compatible (const bfd_arch_info_type *a, const bfd_arch_info_type *b) 33 { 34 /* If a & b are for different architecture we can do nothing. */ 35 if (a->arch != b->arch) 36 return NULL; 37 38 /* If a & b are for the same machine then all is well. */ 39 if (a->mach == b->mach) 40 return a; 41 42 /* Otherwise if either a or b is the 'default' machine 43 then it can be polymorphed into the other. */ 44 if (a->the_default) 45 return b; 46 47 if (b->the_default) 48 return a; 49 50 /* So far all newer ARM architecture cores are 51 supersets of previous cores. */ 52 if (a->mach < b->mach) 53 return b; 54 else if (a->mach > b->mach) 55 return a; 56 57 /* Never reached! */ 58 return NULL; 59 } 60 61 static struct 62 { 63 unsigned int mach; 64 char * name; 65 } 66 processors[] = 67 { 68 { bfd_mach_arm_2, "arm2" }, 69 { bfd_mach_arm_2a, "arm250" }, 70 { bfd_mach_arm_2a, "arm3" }, 71 { bfd_mach_arm_3, "arm6" }, 72 { bfd_mach_arm_3, "arm60" }, 73 { bfd_mach_arm_3, "arm600" }, 74 { bfd_mach_arm_3, "arm610" }, 75 { bfd_mach_arm_3, "arm7" }, 76 { bfd_mach_arm_3, "arm710" }, 77 { bfd_mach_arm_3, "arm7500" }, 78 { bfd_mach_arm_3, "arm7d" }, 79 { bfd_mach_arm_3, "arm7di" }, 80 { bfd_mach_arm_3M, "arm7dm" }, 81 { bfd_mach_arm_3M, "arm7dmi" }, 82 { bfd_mach_arm_4T, "arm7tdmi" }, 83 { bfd_mach_arm_4, "arm8" }, 84 { bfd_mach_arm_4, "arm810" }, 85 { bfd_mach_arm_4, "arm9" }, 86 { bfd_mach_arm_4, "arm920" }, 87 { bfd_mach_arm_4T, "arm920t" }, 88 { bfd_mach_arm_4T, "arm9tdmi" }, 89 { bfd_mach_arm_4, "sa1" }, 90 { bfd_mach_arm_4, "strongarm"}, 91 { bfd_mach_arm_4, "strongarm110" }, 92 { bfd_mach_arm_4, "strongarm1100" }, 93 { bfd_mach_arm_XScale, "xscale" }, 94 { bfd_mach_arm_ep9312, "ep9312" }, 95 { bfd_mach_arm_iWMMXt, "iwmmxt" }, 96 { bfd_mach_arm_iWMMXt2, "iwmmxt2" }, 97 { bfd_mach_arm_unknown, "arm_any" } 98 }; 99 100 static bfd_boolean 101 scan (const struct bfd_arch_info *info, const char *string) 102 { 103 int i; 104 105 /* First test for an exact match. */ 106 if (strcasecmp (string, info->printable_name) == 0) 107 return TRUE; 108 109 /* Next check for a processor name instead of an Architecture name. */ 110 for (i = sizeof (processors) / sizeof (processors[0]); i--;) 111 { 112 if (strcasecmp (string, processors [i].name) == 0) 113 break; 114 } 115 116 if (i != -1 && info->mach == processors [i].mach) 117 return TRUE; 118 119 /* Finally check for the default architecture. */ 120 if (strcasecmp (string, "arm") == 0) 121 return info->the_default; 122 123 return FALSE; 124 } 125 126 #define N(number, print, default, next) \ 127 { 32, 32, 8, bfd_arch_arm, number, "arm", print, 4, default, compatible, \ 128 scan, bfd_arch_default_fill, next } 129 130 static const bfd_arch_info_type arch_info_struct[] = 131 { 132 N (bfd_mach_arm_2, "armv2", FALSE, & arch_info_struct[1]), 133 N (bfd_mach_arm_2a, "armv2a", FALSE, & arch_info_struct[2]), 134 N (bfd_mach_arm_3, "armv3", FALSE, & arch_info_struct[3]), 135 N (bfd_mach_arm_3M, "armv3m", FALSE, & arch_info_struct[4]), 136 N (bfd_mach_arm_4, "armv4", FALSE, & arch_info_struct[5]), 137 N (bfd_mach_arm_4T, "armv4t", FALSE, & arch_info_struct[6]), 138 N (bfd_mach_arm_5, "armv5", FALSE, & arch_info_struct[7]), 139 N (bfd_mach_arm_5T, "armv5t", FALSE, & arch_info_struct[8]), 140 N (bfd_mach_arm_5TE, "armv5te", FALSE, & arch_info_struct[9]), 141 N (bfd_mach_arm_XScale, "xscale", FALSE, & arch_info_struct[10]), 142 N (bfd_mach_arm_ep9312, "ep9312", FALSE, & arch_info_struct[11]), 143 N (bfd_mach_arm_iWMMXt, "iwmmxt", FALSE, & arch_info_struct[12]), 144 N (bfd_mach_arm_iWMMXt2, "iwmmxt2", FALSE, & arch_info_struct[13]), 145 N (bfd_mach_arm_unknown, "arm_any", FALSE, NULL) 146 }; 147 148 const bfd_arch_info_type bfd_arm_arch = 149 N (0, "arm", TRUE, & arch_info_struct[0]); 150 151 /* Support functions used by both the COFF and ELF versions of the ARM port. */ 152 153 /* Handle the merging of the 'machine' settings of input file IBFD 154 and an output file OBFD. These values actually represent the 155 different possible ARM architecture variants. 156 Returns TRUE if they were merged successfully or FALSE otherwise. */ 157 158 bfd_boolean 159 bfd_arm_merge_machines (bfd *ibfd, bfd *obfd) 160 { 161 unsigned int in = bfd_get_mach (ibfd); 162 unsigned int out = bfd_get_mach (obfd); 163 164 /* If the output architecture is unknown, we now have a value to set. */ 165 if (out == bfd_mach_arm_unknown) 166 bfd_set_arch_mach (obfd, bfd_arch_arm, in); 167 168 /* If the input architecture is unknown, 169 then so must be the output architecture. */ 170 else if (in == bfd_mach_arm_unknown) 171 /* FIXME: We ought to have some way to 172 override this on the command line. */ 173 bfd_set_arch_mach (obfd, bfd_arch_arm, bfd_mach_arm_unknown); 174 175 /* If they are the same then nothing needs to be done. */ 176 else if (out == in) 177 ; 178 179 /* Otherwise the general principle that a earlier architecture can be 180 linked with a later architecture to produce a binary that will execute 181 on the later architecture. 182 183 We fail however if we attempt to link a Cirrus EP9312 binary with an 184 Intel XScale binary, since these architecture have co-processors which 185 will not both be present on the same physical hardware. */ 186 else if (in == bfd_mach_arm_ep9312 187 && (out == bfd_mach_arm_XScale 188 || out == bfd_mach_arm_iWMMXt 189 || out == bfd_mach_arm_iWMMXt2)) 190 { 191 _bfd_error_handler (_("\ 192 error: %B is compiled for the EP9312, whereas %B is compiled for XScale"), 193 ibfd, obfd); 194 bfd_set_error (bfd_error_wrong_format); 195 return FALSE; 196 } 197 else if (out == bfd_mach_arm_ep9312 198 && (in == bfd_mach_arm_XScale 199 || in == bfd_mach_arm_iWMMXt 200 || in == bfd_mach_arm_iWMMXt2)) 201 { 202 _bfd_error_handler (_("\ 203 error: %B is compiled for the EP9312, whereas %B is compiled for XScale"), 204 obfd, ibfd); 205 bfd_set_error (bfd_error_wrong_format); 206 return FALSE; 207 } 208 else if (in > out) 209 bfd_set_arch_mach (obfd, bfd_arch_arm, in); 210 /* else 211 Nothing to do. */ 212 213 return TRUE; 214 } 215 216 typedef struct 217 { 218 unsigned char namesz[4]; /* Size of entry's owner string. */ 219 unsigned char descsz[4]; /* Size of the note descriptor. */ 220 unsigned char type[4]; /* Interpretation of the descriptor. */ 221 char name[1]; /* Start of the name+desc data. */ 222 } arm_Note; 223 224 static bfd_boolean 225 arm_check_note (bfd *abfd, 226 bfd_byte *buffer, 227 bfd_size_type buffer_size, 228 const char *expected_name, 229 char **description_return) 230 { 231 unsigned long namesz; 232 unsigned long descsz; 233 unsigned long type; 234 char * descr; 235 236 if (buffer_size < offsetof (arm_Note, name)) 237 return FALSE; 238 239 /* We have to extract the values this way to allow for a 240 host whose endian-ness is different from the target. */ 241 namesz = bfd_get_32 (abfd, buffer); 242 descsz = bfd_get_32 (abfd, buffer + offsetof (arm_Note, descsz)); 243 type = bfd_get_32 (abfd, buffer + offsetof (arm_Note, type)); 244 descr = (char *) buffer + offsetof (arm_Note, name); 245 246 /* Check for buffer overflow. */ 247 if (namesz + descsz + offsetof (arm_Note, name) > buffer_size) 248 return FALSE; 249 250 if (expected_name == NULL) 251 { 252 if (namesz != 0) 253 return FALSE; 254 } 255 else 256 { 257 if (namesz != ((strlen (expected_name) + 1 + 3) & ~3)) 258 return FALSE; 259 260 if (strcmp (descr, expected_name) != 0) 261 return FALSE; 262 263 descr += (namesz + 3) & ~3; 264 } 265 266 /* FIXME: We should probably check the type as well. */ 267 (void) type; 268 269 if (description_return != NULL) 270 * description_return = descr; 271 272 return TRUE; 273 } 274 275 #define NOTE_ARCH_STRING "arch: " 276 277 bfd_boolean 278 bfd_arm_update_notes (bfd *abfd, const char *note_section) 279 { 280 asection * arm_arch_section; 281 bfd_size_type buffer_size; 282 bfd_byte * buffer; 283 char * arch_string; 284 char * expected; 285 286 /* Look for a note section. If one is present check the architecture 287 string encoded in it, and set it to the current architecture if it is 288 different. */ 289 arm_arch_section = bfd_get_section_by_name (abfd, note_section); 290 291 if (arm_arch_section == NULL) 292 return TRUE; 293 294 buffer_size = arm_arch_section->size; 295 if (buffer_size == 0) 296 return FALSE; 297 298 if (!bfd_malloc_and_get_section (abfd, arm_arch_section, &buffer)) 299 goto FAIL; 300 301 /* Parse the note. */ 302 if (! arm_check_note (abfd, buffer, buffer_size, NOTE_ARCH_STRING, & arch_string)) 303 goto FAIL; 304 305 /* Check the architecture in the note against the architecture of the bfd. */ 306 switch (bfd_get_mach (abfd)) 307 { 308 default: 309 case bfd_mach_arm_unknown: expected = "unknown"; break; 310 case bfd_mach_arm_2: expected = "armv2"; break; 311 case bfd_mach_arm_2a: expected = "armv2a"; break; 312 case bfd_mach_arm_3: expected = "armv3"; break; 313 case bfd_mach_arm_3M: expected = "armv3M"; break; 314 case bfd_mach_arm_4: expected = "armv4"; break; 315 case bfd_mach_arm_4T: expected = "armv4t"; break; 316 case bfd_mach_arm_5: expected = "armv5"; break; 317 case bfd_mach_arm_5T: expected = "armv5t"; break; 318 case bfd_mach_arm_5TE: expected = "armv5te"; break; 319 case bfd_mach_arm_XScale: expected = "XScale"; break; 320 case bfd_mach_arm_ep9312: expected = "ep9312"; break; 321 case bfd_mach_arm_iWMMXt: expected = "iWMMXt"; break; 322 case bfd_mach_arm_iWMMXt2: expected = "iWMMXt2"; break; 323 } 324 325 if (strcmp (arch_string, expected) != 0) 326 { 327 strcpy ((char *) buffer + (offsetof (arm_Note, name) 328 + ((strlen (NOTE_ARCH_STRING) + 3) & ~3)), 329 expected); 330 331 if (! bfd_set_section_contents (abfd, arm_arch_section, buffer, 332 (file_ptr) 0, buffer_size)) 333 { 334 (*_bfd_error_handler) 335 (_("warning: unable to update contents of %s section in %s"), 336 note_section, bfd_get_filename (abfd)); 337 goto FAIL; 338 } 339 } 340 341 free (buffer); 342 return TRUE; 343 344 FAIL: 345 if (buffer != NULL) 346 free (buffer); 347 return FALSE; 348 } 349 350 351 static struct 352 { 353 const char * string; 354 unsigned int mach; 355 } 356 architectures[] = 357 { 358 { "armv2", bfd_mach_arm_2 }, 359 { "armv2a", bfd_mach_arm_2a }, 360 { "armv3", bfd_mach_arm_3 }, 361 { "armv3M", bfd_mach_arm_3M }, 362 { "armv4", bfd_mach_arm_4 }, 363 { "armv4t", bfd_mach_arm_4T }, 364 { "armv5", bfd_mach_arm_5 }, 365 { "armv5t", bfd_mach_arm_5T }, 366 { "armv5te", bfd_mach_arm_5TE }, 367 { "XScale", bfd_mach_arm_XScale }, 368 { "ep9312", bfd_mach_arm_ep9312 }, 369 { "iWMMXt", bfd_mach_arm_iWMMXt }, 370 { "iWMMXt2", bfd_mach_arm_iWMMXt2 }, 371 { "arm_any", bfd_mach_arm_unknown } 372 }; 373 374 /* Extract the machine number stored in a note section. */ 375 unsigned int 376 bfd_arm_get_mach_from_notes (bfd *abfd, const char *note_section) 377 { 378 asection * arm_arch_section; 379 bfd_size_type buffer_size; 380 bfd_byte * buffer; 381 char * arch_string; 382 int i; 383 384 /* Look for a note section. If one is present check the architecture 385 string encoded in it, and set it to the current architecture if it is 386 different. */ 387 arm_arch_section = bfd_get_section_by_name (abfd, note_section); 388 389 if (arm_arch_section == NULL) 390 return bfd_mach_arm_unknown; 391 392 buffer_size = arm_arch_section->size; 393 if (buffer_size == 0) 394 return bfd_mach_arm_unknown; 395 396 if (!bfd_malloc_and_get_section (abfd, arm_arch_section, &buffer)) 397 goto FAIL; 398 399 /* Parse the note. */ 400 if (! arm_check_note (abfd, buffer, buffer_size, NOTE_ARCH_STRING, & arch_string)) 401 goto FAIL; 402 403 /* Interpret the architecture string. */ 404 for (i = ARRAY_SIZE (architectures); i--;) 405 if (strcmp (arch_string, architectures[i].string) == 0) 406 { 407 free (buffer); 408 return architectures[i].mach; 409 } 410 411 FAIL: 412 if (buffer != NULL) 413 free (buffer); 414 return bfd_mach_arm_unknown; 415 } 416 417 bfd_boolean 418 bfd_is_arm_special_symbol_name (const char * name, int type) 419 { 420 /* The ARM compiler outputs several obsolete forms. Recognize them 421 in addition to the standard $a, $t and $d. We are somewhat loose 422 in what we accept here, since the full set is not documented. */ 423 if (!name || name[0] != '$') 424 return FALSE; 425 if (name[1] == 'a' || name[1] == 't' || name[1] == 'd') 426 type &= BFD_ARM_SPECIAL_SYM_TYPE_MAP; 427 else if (name[1] == 'm' || name[1] == 'f' || name[1] == 'p') 428 type &= BFD_ARM_SPECIAL_SYM_TYPE_TAG; 429 else if (name[1] >= 'a' && name[1] <= 'z') 430 type &= BFD_ARM_SPECIAL_SYM_TYPE_OTHER; 431 else 432 return FALSE; 433 434 return (type != 0 && (name[2] == 0 || name[2] == '.')); 435 } 436 437
