1/* BFD support for the ARM processor 2 Copyright (C) 1994-2017 Free Software Foundation, Inc. 3 Contributed by Richard Earnshaw (rwe@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 31static const bfd_arch_info_type * 32compatible (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 61static struct 62{ 63 unsigned int mach; 64 char * name; 65} 66processors[] = 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 100static bfd_boolean 101scan (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 130static 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 148const 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 158bfd_boolean 159bfd_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 /* xgettext: c-format */ 192 _bfd_error_handler (_("\ 193error: %B is compiled for the EP9312, whereas %B is compiled for XScale"), 194 ibfd, obfd); 195 bfd_set_error (bfd_error_wrong_format); 196 return FALSE; 197 } 198 else if (out == bfd_mach_arm_ep9312 199 && (in == bfd_mach_arm_XScale 200 || in == bfd_mach_arm_iWMMXt 201 || in == bfd_mach_arm_iWMMXt2)) 202 { 203 /* xgettext: c-format */ 204 _bfd_error_handler (_("\ 205error: %B is compiled for the EP9312, whereas %B is compiled for XScale"), 206 obfd, ibfd); 207 bfd_set_error (bfd_error_wrong_format); 208 return FALSE; 209 } 210 else if (in > out) 211 bfd_set_arch_mach (obfd, bfd_arch_arm, in); 212 /* else 213 Nothing to do. */ 214 215 return TRUE; 216} 217 218typedef struct 219{ 220 unsigned char namesz[4]; /* Size of entry's owner string. */ 221 unsigned char descsz[4]; /* Size of the note descriptor. */ 222 unsigned char type[4]; /* Interpretation of the descriptor. */ 223 char name[1]; /* Start of the name+desc data. */ 224} arm_Note; 225 226static bfd_boolean 227arm_check_note (bfd *abfd, 228 bfd_byte *buffer, 229 bfd_size_type buffer_size, 230 const char *expected_name, 231 char **description_return) 232{ 233 unsigned long namesz; 234 unsigned long descsz; 235 unsigned long type; 236 char * descr; 237 238 if (buffer_size < offsetof (arm_Note, name)) 239 return FALSE; 240 241 /* We have to extract the values this way to allow for a 242 host whose endian-ness is different from the target. */ 243 namesz = bfd_get_32 (abfd, buffer); 244 descsz = bfd_get_32 (abfd, buffer + offsetof (arm_Note, descsz)); 245 type = bfd_get_32 (abfd, buffer + offsetof (arm_Note, type)); 246 descr = (char *) buffer + offsetof (arm_Note, name); 247 248 /* Check for buffer overflow. */ 249 if (namesz + descsz + offsetof (arm_Note, name) > buffer_size) 250 return FALSE; 251 252 if (expected_name == NULL) 253 { 254 if (namesz != 0) 255 return FALSE; 256 } 257 else 258 { 259 if (namesz != ((strlen (expected_name) + 1 + 3) & ~3)) 260 return FALSE; 261 262 if (strcmp (descr, expected_name) != 0) 263 return FALSE; 264 265 descr += (namesz + 3) & ~3; 266 } 267 268 /* FIXME: We should probably check the type as well. */ 269 (void) type; 270 271 if (description_return != NULL) 272 * description_return = descr; 273 274 return TRUE; 275} 276 277#define NOTE_ARCH_STRING "arch: " 278 279bfd_boolean 280bfd_arm_update_notes (bfd *abfd, const char *note_section) 281{ 282 asection * arm_arch_section; 283 bfd_size_type buffer_size; 284 bfd_byte * buffer; 285 char * arch_string; 286 char * expected; 287 288 /* Look for a note section. If one is present check the architecture 289 string encoded in it, and set it to the current architecture if it is 290 different. */ 291 arm_arch_section = bfd_get_section_by_name (abfd, note_section); 292 293 if (arm_arch_section == NULL) 294 return TRUE; 295 296 buffer_size = arm_arch_section->size; 297 if (buffer_size == 0) 298 return FALSE; 299 300 if (!bfd_malloc_and_get_section (abfd, arm_arch_section, &buffer)) 301 goto FAIL; 302 303 /* Parse the note. */ 304 if (! arm_check_note (abfd, buffer, buffer_size, NOTE_ARCH_STRING, & arch_string)) 305 goto FAIL; 306 307 /* Check the architecture in the note against the architecture of the bfd. */ 308 switch (bfd_get_mach (abfd)) 309 { 310 default: 311 case bfd_mach_arm_unknown: expected = "unknown"; break; 312 case bfd_mach_arm_2: expected = "armv2"; break; 313 case bfd_mach_arm_2a: expected = "armv2a"; break; 314 case bfd_mach_arm_3: expected = "armv3"; break; 315 case bfd_mach_arm_3M: expected = "armv3M"; break; 316 case bfd_mach_arm_4: expected = "armv4"; break; 317 case bfd_mach_arm_4T: expected = "armv4t"; break; 318 case bfd_mach_arm_5: expected = "armv5"; break; 319 case bfd_mach_arm_5T: expected = "armv5t"; break; 320 case bfd_mach_arm_5TE: expected = "armv5te"; break; 321 case bfd_mach_arm_XScale: expected = "XScale"; break; 322 case bfd_mach_arm_ep9312: expected = "ep9312"; break; 323 case bfd_mach_arm_iWMMXt: expected = "iWMMXt"; break; 324 case bfd_mach_arm_iWMMXt2: expected = "iWMMXt2"; break; 325 } 326 327 if (strcmp (arch_string, expected) != 0) 328 { 329 strcpy ((char *) buffer + (offsetof (arm_Note, name) 330 + ((strlen (NOTE_ARCH_STRING) + 3) & ~3)), 331 expected); 332 333 if (! bfd_set_section_contents (abfd, arm_arch_section, buffer, 334 (file_ptr) 0, buffer_size)) 335 { 336 _bfd_error_handler 337 /* xgettext: c-format */ 338 (_("warning: unable to update contents of %s section in %s"), 339 note_section, bfd_get_filename (abfd)); 340 goto FAIL; 341 } 342 } 343 344 free (buffer); 345 return TRUE; 346 347 FAIL: 348 if (buffer != NULL) 349 free (buffer); 350 return FALSE; 351} 352 353 354static struct 355{ 356 const char * string; 357 unsigned int mach; 358} 359architectures[] = 360{ 361 { "armv2", bfd_mach_arm_2 }, 362 { "armv2a", bfd_mach_arm_2a }, 363 { "armv3", bfd_mach_arm_3 }, 364 { "armv3M", bfd_mach_arm_3M }, 365 { "armv4", bfd_mach_arm_4 }, 366 { "armv4t", bfd_mach_arm_4T }, 367 { "armv5", bfd_mach_arm_5 }, 368 { "armv5t", bfd_mach_arm_5T }, 369 { "armv5te", bfd_mach_arm_5TE }, 370 { "XScale", bfd_mach_arm_XScale }, 371 { "ep9312", bfd_mach_arm_ep9312 }, 372 { "iWMMXt", bfd_mach_arm_iWMMXt }, 373 { "iWMMXt2", bfd_mach_arm_iWMMXt2 }, 374 { "arm_any", bfd_mach_arm_unknown } 375}; 376 377/* Extract the machine number stored in a note section. */ 378unsigned int 379bfd_arm_get_mach_from_notes (bfd *abfd, const char *note_section) 380{ 381 asection * arm_arch_section; 382 bfd_size_type buffer_size; 383 bfd_byte * buffer; 384 char * arch_string; 385 int i; 386 387 /* Look for a note section. If one is present check the architecture 388 string encoded in it, and set it to the current architecture if it is 389 different. */ 390 arm_arch_section = bfd_get_section_by_name (abfd, note_section); 391 392 if (arm_arch_section == NULL) 393 return bfd_mach_arm_unknown; 394 395 buffer_size = arm_arch_section->size; 396 if (buffer_size == 0) 397 return bfd_mach_arm_unknown; 398 399 if (!bfd_malloc_and_get_section (abfd, arm_arch_section, &buffer)) 400 goto FAIL; 401 402 /* Parse the note. */ 403 if (! arm_check_note (abfd, buffer, buffer_size, NOTE_ARCH_STRING, & arch_string)) 404 goto FAIL; 405 406 /* Interpret the architecture string. */ 407 for (i = ARRAY_SIZE (architectures); i--;) 408 if (strcmp (arch_string, architectures[i].string) == 0) 409 { 410 free (buffer); 411 return architectures[i].mach; 412 } 413 414 FAIL: 415 if (buffer != NULL) 416 free (buffer); 417 return bfd_mach_arm_unknown; 418} 419 420bfd_boolean 421bfd_is_arm_special_symbol_name (const char * name, int type) 422{ 423 /* The ARM compiler outputs several obsolete forms. Recognize them 424 in addition to the standard $a, $t and $d. We are somewhat loose 425 in what we accept here, since the full set is not documented. */ 426 if (!name || name[0] != '$') 427 return FALSE; 428 if (name[1] == 'a' || name[1] == 't' || name[1] == 'd') 429 type &= BFD_ARM_SPECIAL_SYM_TYPE_MAP; 430 else if (name[1] == 'm' || name[1] == 'f' || name[1] == 'p') 431 type &= BFD_ARM_SPECIAL_SYM_TYPE_TAG; 432 else if (name[1] >= 'a' && name[1] <= 'z') 433 type &= BFD_ARM_SPECIAL_SYM_TYPE_OTHER; 434 else 435 return FALSE; 436 437 return (type != 0 && (name[2] == 0 || name[2] == '.')); 438} 439 440