| 1 | /* OS ABI variant handling for GDB. |
| 2 | |
| 3 | Copyright (C) 2001-2015 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 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, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | |
| 22 | #include "osabi.h" |
| 23 | #include "arch-utils.h" |
| 24 | #include "gdbcmd.h" |
| 25 | #include "command.h" |
| 26 | |
| 27 | #include "elf-bfd.h" |
| 28 | |
| 29 | #ifndef GDB_OSABI_DEFAULT |
| 30 | #define GDB_OSABI_DEFAULT GDB_OSABI_UNKNOWN |
| 31 | #endif |
| 32 | |
| 33 | /* State for the "set osabi" command. */ |
| 34 | static enum { osabi_auto, osabi_default, osabi_user } user_osabi_state; |
| 35 | static enum gdb_osabi user_selected_osabi; |
| 36 | static const char *gdb_osabi_available_names[GDB_OSABI_INVALID + 3] = { |
| 37 | "auto", |
| 38 | "default", |
| 39 | "none", |
| 40 | NULL |
| 41 | }; |
| 42 | static const char *set_osabi_string; |
| 43 | |
| 44 | /* Names associated with each osabi. */ |
| 45 | |
| 46 | struct osabi_names |
| 47 | { |
| 48 | /* The "pretty" name. */ |
| 49 | |
| 50 | const char *pretty; |
| 51 | |
| 52 | /* The triplet regexp, or NULL if not known. */ |
| 53 | |
| 54 | const char *regexp; |
| 55 | }; |
| 56 | |
| 57 | /* This table matches the indices assigned to enum gdb_osabi. Keep |
| 58 | them in sync. */ |
| 59 | static const struct osabi_names gdb_osabi_names[] = |
| 60 | { |
| 61 | { "none", NULL }, |
| 62 | |
| 63 | { "SVR4", NULL }, |
| 64 | { "GNU/Hurd", NULL }, |
| 65 | { "Solaris", NULL }, |
| 66 | { "GNU/Linux", "linux(-gnu)?" }, |
| 67 | { "FreeBSD a.out", NULL }, |
| 68 | { "FreeBSD ELF", NULL }, |
| 69 | { "NetBSD a.out", NULL }, |
| 70 | { "NetBSD ELF", NULL }, |
| 71 | { "OpenBSD ELF", NULL }, |
| 72 | { "Windows CE", NULL }, |
| 73 | { "DJGPP", NULL }, |
| 74 | { "Irix", NULL }, |
| 75 | { "HP/UX ELF", NULL }, |
| 76 | { "HP/UX SOM", NULL }, |
| 77 | { "QNX Neutrino", NULL }, |
| 78 | { "Cygwin", NULL }, |
| 79 | { "AIX", NULL }, |
| 80 | { "DICOS", NULL }, |
| 81 | { "Darwin", NULL }, |
| 82 | { "Symbian", NULL }, |
| 83 | { "OpenVMS", NULL }, |
| 84 | { "LynxOS178", NULL }, |
| 85 | { "Newlib", NULL }, |
| 86 | { "SDE", NULL }, |
| 87 | |
| 88 | { "<invalid>", NULL } |
| 89 | }; |
| 90 | |
| 91 | const char * |
| 92 | gdbarch_osabi_name (enum gdb_osabi osabi) |
| 93 | { |
| 94 | if (osabi >= GDB_OSABI_UNKNOWN && osabi < GDB_OSABI_INVALID) |
| 95 | return gdb_osabi_names[osabi].pretty; |
| 96 | |
| 97 | return gdb_osabi_names[GDB_OSABI_INVALID].pretty; |
| 98 | } |
| 99 | |
| 100 | /* See osabi.h. */ |
| 101 | |
| 102 | const char * |
| 103 | osabi_triplet_regexp (enum gdb_osabi osabi) |
| 104 | { |
| 105 | if (osabi >= GDB_OSABI_UNKNOWN && osabi < GDB_OSABI_INVALID) |
| 106 | return gdb_osabi_names[osabi].regexp; |
| 107 | |
| 108 | return gdb_osabi_names[GDB_OSABI_INVALID].regexp; |
| 109 | } |
| 110 | |
| 111 | /* Lookup the OS ABI corresponding to the specified target description |
| 112 | string. */ |
| 113 | |
| 114 | enum gdb_osabi |
| 115 | osabi_from_tdesc_string (const char *name) |
| 116 | { |
| 117 | int i; |
| 118 | |
| 119 | for (i = 0; i < ARRAY_SIZE (gdb_osabi_names); i++) |
| 120 | if (strcmp (name, gdb_osabi_names[i].pretty) == 0) |
| 121 | { |
| 122 | /* See note above: the name table matches the indices assigned |
| 123 | to enum gdb_osabi. */ |
| 124 | enum gdb_osabi osabi = (enum gdb_osabi) i; |
| 125 | |
| 126 | if (osabi == GDB_OSABI_INVALID) |
| 127 | return GDB_OSABI_UNKNOWN; |
| 128 | else |
| 129 | return osabi; |
| 130 | } |
| 131 | |
| 132 | return GDB_OSABI_UNKNOWN; |
| 133 | } |
| 134 | |
| 135 | /* Handler for a given architecture/OS ABI pair. There should be only |
| 136 | one handler for a given OS ABI each architecture family. */ |
| 137 | struct gdb_osabi_handler |
| 138 | { |
| 139 | struct gdb_osabi_handler *next; |
| 140 | const struct bfd_arch_info *arch_info; |
| 141 | enum gdb_osabi osabi; |
| 142 | void (*init_osabi)(struct gdbarch_info, struct gdbarch *); |
| 143 | }; |
| 144 | |
| 145 | static struct gdb_osabi_handler *gdb_osabi_handler_list; |
| 146 | |
| 147 | void |
| 148 | gdbarch_register_osabi (enum bfd_architecture arch, unsigned long machine, |
| 149 | enum gdb_osabi osabi, |
| 150 | void (*init_osabi)(struct gdbarch_info, |
| 151 | struct gdbarch *)) |
| 152 | { |
| 153 | struct gdb_osabi_handler **handler_p; |
| 154 | const struct bfd_arch_info *arch_info = bfd_lookup_arch (arch, machine); |
| 155 | const char **name_ptr; |
| 156 | |
| 157 | /* Registering an OS ABI handler for "unknown" is not allowed. */ |
| 158 | if (osabi == GDB_OSABI_UNKNOWN) |
| 159 | { |
| 160 | internal_error |
| 161 | (__FILE__, __LINE__, |
| 162 | _("gdbarch_register_osabi: An attempt to register a handler for " |
| 163 | "OS ABI \"%s\" for architecture %s was made. The handler will " |
| 164 | "not be registered"), |
| 165 | gdbarch_osabi_name (osabi), |
| 166 | bfd_printable_arch_mach (arch, machine)); |
| 167 | return; |
| 168 | } |
| 169 | |
| 170 | gdb_assert (arch_info); |
| 171 | |
| 172 | for (handler_p = &gdb_osabi_handler_list; *handler_p != NULL; |
| 173 | handler_p = &(*handler_p)->next) |
| 174 | { |
| 175 | if ((*handler_p)->arch_info == arch_info |
| 176 | && (*handler_p)->osabi == osabi) |
| 177 | { |
| 178 | internal_error |
| 179 | (__FILE__, __LINE__, |
| 180 | _("gdbarch_register_osabi: A handler for OS ABI \"%s\" " |
| 181 | "has already been registered for architecture %s"), |
| 182 | gdbarch_osabi_name (osabi), |
| 183 | arch_info->printable_name); |
| 184 | /* If user wants to continue, override previous definition. */ |
| 185 | (*handler_p)->init_osabi = init_osabi; |
| 186 | return; |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | (*handler_p) = XNEW (struct gdb_osabi_handler); |
| 191 | (*handler_p)->next = NULL; |
| 192 | (*handler_p)->arch_info = arch_info; |
| 193 | (*handler_p)->osabi = osabi; |
| 194 | (*handler_p)->init_osabi = init_osabi; |
| 195 | |
| 196 | /* Add this OS ABI to the list of enum values for "set osabi", if it isn't |
| 197 | already there. */ |
| 198 | for (name_ptr = gdb_osabi_available_names; *name_ptr; name_ptr ++) |
| 199 | { |
| 200 | if (*name_ptr == gdbarch_osabi_name (osabi)) |
| 201 | return; |
| 202 | } |
| 203 | *name_ptr++ = gdbarch_osabi_name (osabi); |
| 204 | *name_ptr = NULL; |
| 205 | } |
| 206 | \f |
| 207 | |
| 208 | /* Sniffer to find the OS ABI for a given file's architecture and flavour. |
| 209 | It is legal to have multiple sniffers for each arch/flavour pair, to |
| 210 | disambiguate one OS's a.out from another, for example. The first sniffer |
| 211 | to return something other than GDB_OSABI_UNKNOWN wins, so a sniffer should |
| 212 | be careful to claim a file only if it knows for sure what it is. */ |
| 213 | struct gdb_osabi_sniffer |
| 214 | { |
| 215 | struct gdb_osabi_sniffer *next; |
| 216 | enum bfd_architecture arch; /* bfd_arch_unknown == wildcard */ |
| 217 | enum bfd_flavour flavour; |
| 218 | enum gdb_osabi (*sniffer)(bfd *); |
| 219 | }; |
| 220 | |
| 221 | static struct gdb_osabi_sniffer *gdb_osabi_sniffer_list; |
| 222 | |
| 223 | void |
| 224 | gdbarch_register_osabi_sniffer (enum bfd_architecture arch, |
| 225 | enum bfd_flavour flavour, |
| 226 | enum gdb_osabi (*sniffer_fn)(bfd *)) |
| 227 | { |
| 228 | struct gdb_osabi_sniffer *sniffer; |
| 229 | |
| 230 | sniffer = XNEW (struct gdb_osabi_sniffer); |
| 231 | sniffer->arch = arch; |
| 232 | sniffer->flavour = flavour; |
| 233 | sniffer->sniffer = sniffer_fn; |
| 234 | |
| 235 | sniffer->next = gdb_osabi_sniffer_list; |
| 236 | gdb_osabi_sniffer_list = sniffer; |
| 237 | } |
| 238 | \f |
| 239 | |
| 240 | enum gdb_osabi |
| 241 | gdbarch_lookup_osabi (bfd *abfd) |
| 242 | { |
| 243 | struct gdb_osabi_sniffer *sniffer; |
| 244 | enum gdb_osabi osabi, match; |
| 245 | int match_specific; |
| 246 | |
| 247 | /* If we aren't in "auto" mode, return the specified OS ABI. */ |
| 248 | if (user_osabi_state == osabi_user) |
| 249 | return user_selected_osabi; |
| 250 | |
| 251 | /* If we don't have a binary, just return unknown. The caller may |
| 252 | have other sources the OSABI can be extracted from, e.g., the |
| 253 | target description. */ |
| 254 | if (abfd == NULL) |
| 255 | return GDB_OSABI_UNKNOWN; |
| 256 | |
| 257 | match = GDB_OSABI_UNKNOWN; |
| 258 | match_specific = 0; |
| 259 | |
| 260 | for (sniffer = gdb_osabi_sniffer_list; sniffer != NULL; |
| 261 | sniffer = sniffer->next) |
| 262 | { |
| 263 | if ((sniffer->arch == bfd_arch_unknown /* wildcard */ |
| 264 | || sniffer->arch == bfd_get_arch (abfd)) |
| 265 | && sniffer->flavour == bfd_get_flavour (abfd)) |
| 266 | { |
| 267 | osabi = (*sniffer->sniffer) (abfd); |
| 268 | if (osabi < GDB_OSABI_UNKNOWN || osabi >= GDB_OSABI_INVALID) |
| 269 | { |
| 270 | internal_error |
| 271 | (__FILE__, __LINE__, |
| 272 | _("gdbarch_lookup_osabi: invalid OS ABI (%d) from sniffer " |
| 273 | "for architecture %s flavour %d"), |
| 274 | (int) osabi, |
| 275 | bfd_printable_arch_mach (bfd_get_arch (abfd), 0), |
| 276 | (int) bfd_get_flavour (abfd)); |
| 277 | } |
| 278 | else if (osabi != GDB_OSABI_UNKNOWN) |
| 279 | { |
| 280 | /* A specific sniffer always overrides a generic sniffer. |
| 281 | Croak on multiple match if the two matches are of the |
| 282 | same class. If the user wishes to continue, we'll use |
| 283 | the first match. */ |
| 284 | if (match != GDB_OSABI_UNKNOWN) |
| 285 | { |
| 286 | if ((match_specific && sniffer->arch != bfd_arch_unknown) |
| 287 | || (!match_specific && sniffer->arch == bfd_arch_unknown)) |
| 288 | { |
| 289 | internal_error |
| 290 | (__FILE__, __LINE__, |
| 291 | _("gdbarch_lookup_osabi: multiple %sspecific OS ABI " |
| 292 | "match for architecture %s flavour %d: first " |
| 293 | "match \"%s\", second match \"%s\""), |
| 294 | match_specific ? "" : "non-", |
| 295 | bfd_printable_arch_mach (bfd_get_arch (abfd), 0), |
| 296 | (int) bfd_get_flavour (abfd), |
| 297 | gdbarch_osabi_name (match), |
| 298 | gdbarch_osabi_name (osabi)); |
| 299 | } |
| 300 | else if (sniffer->arch != bfd_arch_unknown) |
| 301 | { |
| 302 | match = osabi; |
| 303 | match_specific = 1; |
| 304 | } |
| 305 | } |
| 306 | else |
| 307 | { |
| 308 | match = osabi; |
| 309 | if (sniffer->arch != bfd_arch_unknown) |
| 310 | match_specific = 1; |
| 311 | } |
| 312 | } |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | return match; |
| 317 | } |
| 318 | |
| 319 | |
| 320 | /* Return non-zero if architecture A can run code written for |
| 321 | architecture B. */ |
| 322 | static int |
| 323 | can_run_code_for (const struct bfd_arch_info *a, const struct bfd_arch_info *b) |
| 324 | { |
| 325 | /* BFD's 'A->compatible (A, B)' functions return zero if A and B are |
| 326 | incompatible. But if they are compatible, it returns the 'more |
| 327 | featureful' of the two arches. That is, if A can run code |
| 328 | written for B, but B can't run code written for A, then it'll |
| 329 | return A. |
| 330 | |
| 331 | struct bfd_arch_info objects are singletons: that is, there's |
| 332 | supposed to be exactly one instance for a given machine. So you |
| 333 | can tell whether two are equivalent by comparing pointers. */ |
| 334 | return (a == b || a->compatible (a, b) == a); |
| 335 | } |
| 336 | |
| 337 | |
| 338 | void |
| 339 | gdbarch_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 340 | { |
| 341 | struct gdb_osabi_handler *handler; |
| 342 | |
| 343 | if (info.osabi == GDB_OSABI_UNKNOWN) |
| 344 | { |
| 345 | /* Don't complain about an unknown OSABI. Assume the user knows |
| 346 | what they are doing. */ |
| 347 | return; |
| 348 | } |
| 349 | |
| 350 | for (handler = gdb_osabi_handler_list; handler != NULL; |
| 351 | handler = handler->next) |
| 352 | { |
| 353 | if (handler->osabi != info.osabi) |
| 354 | continue; |
| 355 | |
| 356 | /* If the architecture described by ARCH_INFO can run code for |
| 357 | the architcture we registered the handler for, then the |
| 358 | handler is applicable. Note, though, that if the handler is |
| 359 | for an architecture that is a superset of ARCH_INFO, we can't |
| 360 | use that --- it would be perfectly correct for it to install |
| 361 | gdbarch methods that refer to registers / instructions / |
| 362 | other facilities ARCH_INFO doesn't have. |
| 363 | |
| 364 | NOTE: kettenis/20021027: There may be more than one machine |
| 365 | type that is compatible with the desired machine type. Right |
| 366 | now we simply return the first match, which is fine for now. |
| 367 | However, we might want to do something smarter in the future. */ |
| 368 | /* NOTE: cagney/2003-10-23: The code for "a can_run_code_for b" |
| 369 | is implemented using BFD's compatible method (a->compatible |
| 370 | (b) == a -- the lowest common denominator between a and b is |
| 371 | a). That method's definition of compatible may not be as you |
| 372 | expect. For instance the test "amd64 can run code for i386" |
| 373 | (or more generally "64-bit ISA can run code for the 32-bit |
| 374 | ISA"). BFD doesn't normally consider 32-bit and 64-bit |
| 375 | "compatible" so it doesn't succeed. */ |
| 376 | if (can_run_code_for (info.bfd_arch_info, handler->arch_info)) |
| 377 | { |
| 378 | (*handler->init_osabi) (info, gdbarch); |
| 379 | return; |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | warning |
| 384 | ("A handler for the OS ABI \"%s\" is not built into this configuration\n" |
| 385 | "of GDB. Attempting to continue with the default %s settings.\n", |
| 386 | gdbarch_osabi_name (info.osabi), |
| 387 | info.bfd_arch_info->printable_name); |
| 388 | } |
| 389 | \f |
| 390 | /* Limit on the amount of data to be read. */ |
| 391 | #define MAX_NOTESZ 128 |
| 392 | |
| 393 | /* Return non-zero if NOTE matches NAME, DESCSZ and TYPE. If |
| 394 | *SECTSIZE is non-zero, then this reads that many bytes from |
| 395 | the start of the section and clears *SECTSIZE. */ |
| 396 | |
| 397 | static int |
| 398 | check_note (bfd *abfd, asection *sect, char *note, unsigned int *sectsize, |
| 399 | const char *name, unsigned long descsz, unsigned long type) |
| 400 | { |
| 401 | unsigned long notesz; |
| 402 | |
| 403 | if (*sectsize) |
| 404 | { |
| 405 | if (!bfd_get_section_contents (abfd, sect, note, 0, *sectsize)) |
| 406 | return 0; |
| 407 | *sectsize = 0; |
| 408 | } |
| 409 | |
| 410 | /* Calculate the size of this note. */ |
| 411 | notesz = strlen (name) + 1; |
| 412 | notesz = ((notesz + 3) & ~3); |
| 413 | notesz += descsz; |
| 414 | notesz = ((notesz + 3) & ~3); |
| 415 | |
| 416 | /* If this assertion triggers, increase MAX_NOTESZ. */ |
| 417 | gdb_assert (notesz <= MAX_NOTESZ); |
| 418 | |
| 419 | /* Check whether SECT is big enough to comtain the complete note. */ |
| 420 | if (notesz > bfd_section_size (abfd, sect)) |
| 421 | return 0; |
| 422 | |
| 423 | /* Check the note name. */ |
| 424 | if (bfd_h_get_32 (abfd, note) != (strlen (name) + 1) |
| 425 | || strcmp (note + 12, name) != 0) |
| 426 | return 0; |
| 427 | |
| 428 | /* Check the descriptor size. */ |
| 429 | if (bfd_h_get_32 (abfd, note + 4) != descsz) |
| 430 | return 0; |
| 431 | |
| 432 | /* Check the note type. */ |
| 433 | if (bfd_h_get_32 (abfd, note + 8) != type) |
| 434 | return 0; |
| 435 | |
| 436 | return 1; |
| 437 | } |
| 438 | |
| 439 | /* Generic sniffer for ELF flavoured files. */ |
| 440 | |
| 441 | void |
| 442 | generic_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect, void *obj) |
| 443 | { |
| 444 | enum gdb_osabi *osabi = obj; |
| 445 | const char *name; |
| 446 | unsigned int sectsize; |
| 447 | char *note; |
| 448 | |
| 449 | name = bfd_get_section_name (abfd, sect); |
| 450 | sectsize = bfd_section_size (abfd, sect); |
| 451 | |
| 452 | /* Limit the amount of data to read. */ |
| 453 | if (sectsize > MAX_NOTESZ) |
| 454 | sectsize = MAX_NOTESZ; |
| 455 | |
| 456 | /* We lazily read the section data here. Since we use |
| 457 | BFD_DECOMPRESS, we can't use bfd_get_section_contents on a |
| 458 | compressed section. But, since note sections are not compressed, |
| 459 | deferring the reading until we recognize the section avoids any |
| 460 | error. */ |
| 461 | note = alloca (sectsize); |
| 462 | |
| 463 | /* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */ |
| 464 | if (strcmp (name, ".note.ABI-tag") == 0) |
| 465 | { |
| 466 | /* GNU. */ |
| 467 | if (check_note (abfd, sect, note, §size, "GNU", 16, NT_GNU_ABI_TAG)) |
| 468 | { |
| 469 | unsigned int abi_tag = bfd_h_get_32 (abfd, note + 16); |
| 470 | |
| 471 | switch (abi_tag) |
| 472 | { |
| 473 | case GNU_ABI_TAG_LINUX: |
| 474 | *osabi = GDB_OSABI_LINUX; |
| 475 | break; |
| 476 | |
| 477 | case GNU_ABI_TAG_HURD: |
| 478 | *osabi = GDB_OSABI_HURD; |
| 479 | break; |
| 480 | |
| 481 | case GNU_ABI_TAG_SOLARIS: |
| 482 | *osabi = GDB_OSABI_SOLARIS; |
| 483 | break; |
| 484 | |
| 485 | case GNU_ABI_TAG_FREEBSD: |
| 486 | *osabi = GDB_OSABI_FREEBSD_ELF; |
| 487 | break; |
| 488 | |
| 489 | case GNU_ABI_TAG_NETBSD: |
| 490 | *osabi = GDB_OSABI_NETBSD_ELF; |
| 491 | break; |
| 492 | |
| 493 | default: |
| 494 | warning (_("GNU ABI tag value %u unrecognized."), abi_tag); |
| 495 | break; |
| 496 | } |
| 497 | return; |
| 498 | } |
| 499 | |
| 500 | /* FreeBSD. */ |
| 501 | if (check_note (abfd, sect, note, §size, "FreeBSD", 4, |
| 502 | NT_FREEBSD_ABI_TAG)) |
| 503 | { |
| 504 | /* There is no need to check the version yet. */ |
| 505 | *osabi = GDB_OSABI_FREEBSD_ELF; |
| 506 | return; |
| 507 | } |
| 508 | |
| 509 | return; |
| 510 | } |
| 511 | |
| 512 | /* .note.netbsd.ident notes, used by NetBSD. */ |
| 513 | if (strcmp (name, ".note.netbsd.ident") == 0 |
| 514 | && check_note (abfd, sect, note, §size, "NetBSD", 4, NT_NETBSD_IDENT)) |
| 515 | { |
| 516 | /* There is no need to check the version yet. */ |
| 517 | *osabi = GDB_OSABI_NETBSD_ELF; |
| 518 | return; |
| 519 | } |
| 520 | |
| 521 | /* .note.openbsd.ident notes, used by OpenBSD. */ |
| 522 | if (strcmp (name, ".note.openbsd.ident") == 0 |
| 523 | && check_note (abfd, sect, note, §size, "OpenBSD", 4, |
| 524 | NT_OPENBSD_IDENT)) |
| 525 | { |
| 526 | /* There is no need to check the version yet. */ |
| 527 | *osabi = GDB_OSABI_OPENBSD_ELF; |
| 528 | return; |
| 529 | } |
| 530 | |
| 531 | /* .note.netbsdcore.procinfo notes, used by NetBSD. */ |
| 532 | if (strcmp (name, ".note.netbsdcore.procinfo") == 0) |
| 533 | { |
| 534 | *osabi = GDB_OSABI_NETBSD_ELF; |
| 535 | return; |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | static enum gdb_osabi |
| 540 | generic_elf_osabi_sniffer (bfd *abfd) |
| 541 | { |
| 542 | unsigned int elfosabi; |
| 543 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
| 544 | |
| 545 | elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; |
| 546 | |
| 547 | switch (elfosabi) |
| 548 | { |
| 549 | case ELFOSABI_NONE: |
| 550 | case ELFOSABI_GNU: |
| 551 | /* When the EI_OSABI field in the ELF header is ELFOSABI_NONE |
| 552 | (0), then the ELF structures in the file are conforming to |
| 553 | the base specification for that machine (there are no |
| 554 | OS-specific extensions). In order to determine the real OS |
| 555 | in use, we must look for OS-specific notes. |
| 556 | |
| 557 | The same applies for ELFOSABI_GNU: this can mean GNU/Hurd, |
| 558 | GNU/Linux, and possibly more. */ |
| 559 | bfd_map_over_sections (abfd, |
| 560 | generic_elf_osabi_sniff_abi_tag_sections, |
| 561 | &osabi); |
| 562 | break; |
| 563 | |
| 564 | case ELFOSABI_FREEBSD: |
| 565 | osabi = GDB_OSABI_FREEBSD_ELF; |
| 566 | break; |
| 567 | |
| 568 | case ELFOSABI_NETBSD: |
| 569 | osabi = GDB_OSABI_NETBSD_ELF; |
| 570 | break; |
| 571 | |
| 572 | case ELFOSABI_SOLARIS: |
| 573 | osabi = GDB_OSABI_SOLARIS; |
| 574 | break; |
| 575 | |
| 576 | case ELFOSABI_HPUX: |
| 577 | /* For some reason the default value for the EI_OSABI field is |
| 578 | ELFOSABI_HPUX for all PA-RISC targets (with the exception of |
| 579 | GNU/Linux). We use HP-UX ELF as the default, but let any |
| 580 | OS-specific notes override this. */ |
| 581 | osabi = GDB_OSABI_HPUX_ELF; |
| 582 | bfd_map_over_sections (abfd, |
| 583 | generic_elf_osabi_sniff_abi_tag_sections, |
| 584 | &osabi); |
| 585 | break; |
| 586 | |
| 587 | case ELFOSABI_OPENVMS: |
| 588 | osabi = GDB_OSABI_OPENVMS; |
| 589 | break; |
| 590 | } |
| 591 | |
| 592 | if (osabi == GDB_OSABI_UNKNOWN) |
| 593 | { |
| 594 | /* The FreeBSD folks have been naughty; they stored the string |
| 595 | "FreeBSD" in the padding of the e_ident field of the ELF |
| 596 | header to "brand" their ELF binaries in FreeBSD 3.x. */ |
| 597 | if (memcmp (&elf_elfheader (abfd)->e_ident[8], |
| 598 | "FreeBSD", sizeof ("FreeBSD")) == 0) |
| 599 | osabi = GDB_OSABI_FREEBSD_ELF; |
| 600 | } |
| 601 | |
| 602 | return osabi; |
| 603 | } |
| 604 | \f |
| 605 | static void |
| 606 | set_osabi (char *args, int from_tty, struct cmd_list_element *c) |
| 607 | { |
| 608 | struct gdbarch_info info; |
| 609 | |
| 610 | if (strcmp (set_osabi_string, "auto") == 0) |
| 611 | user_osabi_state = osabi_auto; |
| 612 | else if (strcmp (set_osabi_string, "default") == 0) |
| 613 | { |
| 614 | user_selected_osabi = GDB_OSABI_DEFAULT; |
| 615 | user_osabi_state = osabi_user; |
| 616 | } |
| 617 | else if (strcmp (set_osabi_string, "none") == 0) |
| 618 | { |
| 619 | user_selected_osabi = GDB_OSABI_UNKNOWN; |
| 620 | user_osabi_state = osabi_user; |
| 621 | } |
| 622 | else |
| 623 | { |
| 624 | int i; |
| 625 | |
| 626 | for (i = 1; i < GDB_OSABI_INVALID; i++) |
| 627 | { |
| 628 | enum gdb_osabi osabi = (enum gdb_osabi) i; |
| 629 | |
| 630 | if (strcmp (set_osabi_string, gdbarch_osabi_name (osabi)) == 0) |
| 631 | { |
| 632 | user_selected_osabi = osabi; |
| 633 | user_osabi_state = osabi_user; |
| 634 | break; |
| 635 | } |
| 636 | } |
| 637 | if (i == GDB_OSABI_INVALID) |
| 638 | internal_error (__FILE__, __LINE__, |
| 639 | _("Invalid OS ABI \"%s\" passed to command handler."), |
| 640 | set_osabi_string); |
| 641 | } |
| 642 | |
| 643 | /* NOTE: At some point (true multiple architectures) we'll need to be more |
| 644 | graceful here. */ |
| 645 | gdbarch_info_init (&info); |
| 646 | if (! gdbarch_update_p (info)) |
| 647 | internal_error (__FILE__, __LINE__, _("Updating OS ABI failed.")); |
| 648 | } |
| 649 | |
| 650 | static void |
| 651 | show_osabi (struct ui_file *file, int from_tty, struct cmd_list_element *c, |
| 652 | const char *value) |
| 653 | { |
| 654 | if (user_osabi_state == osabi_auto) |
| 655 | fprintf_filtered (file, |
| 656 | _("The current OS ABI is \"auto\" " |
| 657 | "(currently \"%s\").\n"), |
| 658 | gdbarch_osabi_name (gdbarch_osabi (get_current_arch ()))); |
| 659 | else |
| 660 | fprintf_filtered (file, _("The current OS ABI is \"%s\".\n"), |
| 661 | gdbarch_osabi_name (user_selected_osabi)); |
| 662 | |
| 663 | if (GDB_OSABI_DEFAULT != GDB_OSABI_UNKNOWN) |
| 664 | fprintf_filtered (file, _("The default OS ABI is \"%s\".\n"), |
| 665 | gdbarch_osabi_name (GDB_OSABI_DEFAULT)); |
| 666 | } |
| 667 | \f |
| 668 | extern initialize_file_ftype _initialize_gdb_osabi; /* -Wmissing-prototype */ |
| 669 | |
| 670 | void |
| 671 | _initialize_gdb_osabi (void) |
| 672 | { |
| 673 | if (strcmp (gdb_osabi_names[GDB_OSABI_INVALID].pretty, "<invalid>") != 0) |
| 674 | internal_error |
| 675 | (__FILE__, __LINE__, |
| 676 | _("_initialize_gdb_osabi: gdb_osabi_names[] is inconsistent")); |
| 677 | |
| 678 | /* Register a generic sniffer for ELF flavoured files. */ |
| 679 | gdbarch_register_osabi_sniffer (bfd_arch_unknown, |
| 680 | bfd_target_elf_flavour, |
| 681 | generic_elf_osabi_sniffer); |
| 682 | |
| 683 | /* Register the "set osabi" command. */ |
| 684 | add_setshow_enum_cmd ("osabi", class_support, gdb_osabi_available_names, |
| 685 | &set_osabi_string, |
| 686 | _("Set OS ABI of target."), |
| 687 | _("Show OS ABI of target."), |
| 688 | NULL, set_osabi, show_osabi, |
| 689 | &setlist, &showlist); |
| 690 | user_osabi_state = osabi_auto; |
| 691 | } |