Commit | Line | Data |
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70f80edf | 1 | /* OS ABI variant handling for GDB. |
533f1d8f | 2 | |
28e7fd62 | 3 | Copyright (C) 2001-2013 Free Software Foundation, Inc. |
70f80edf JT |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
70f80edf JT |
10 | (at your option) any later version. |
11 | ||
a9762ec7 | 12 | This program is distributed in the hope that it will be useful, |
70f80edf JT |
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. | |
a9762ec7 | 16 | |
70f80edf | 17 | You should have received a copy of the GNU General Public License |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
70f80edf JT |
19 | |
20 | #include "defs.h" | |
05816f70 MK |
21 | |
22 | #include "gdb_assert.h" | |
309367d4 | 23 | #include "gdb_string.h" |
05816f70 | 24 | |
70f80edf | 25 | #include "osabi.h" |
b00a8037 DJ |
26 | #include "arch-utils.h" |
27 | #include "gdbcmd.h" | |
28 | #include "command.h" | |
70f80edf JT |
29 | |
30 | #include "elf-bfd.h" | |
31 | ||
b00a8037 DJ |
32 | #ifndef GDB_OSABI_DEFAULT |
33 | #define GDB_OSABI_DEFAULT GDB_OSABI_UNKNOWN | |
34 | #endif | |
35 | ||
36 | /* State for the "set osabi" command. */ | |
37 | static enum { osabi_auto, osabi_default, osabi_user } user_osabi_state; | |
38 | static enum gdb_osabi user_selected_osabi; | |
39 | static const char *gdb_osabi_available_names[GDB_OSABI_INVALID + 3] = { | |
40 | "auto", | |
41 | "default", | |
42 | "none", | |
43 | NULL | |
44 | }; | |
45 | static const char *set_osabi_string; | |
70f80edf JT |
46 | |
47 | /* This table matches the indices assigned to enum gdb_osabi. Keep | |
48 | them in sync. */ | |
49 | static const char * const gdb_osabi_names[] = | |
50 | { | |
b00a8037 | 51 | "none", |
70f80edf JT |
52 | |
53 | "SVR4", | |
54 | "GNU/Hurd", | |
55 | "Solaris", | |
56 | "OSF/1", | |
57 | "GNU/Linux", | |
58 | "FreeBSD a.out", | |
59 | "FreeBSD ELF", | |
60 | "NetBSD a.out", | |
61 | "NetBSD ELF", | |
d33b9831 | 62 | "OpenBSD ELF", |
70f80edf | 63 | "Windows CE", |
1029b7fa | 64 | "DJGPP", |
b96d0a4e | 65 | "Irix", |
e64f66d1 | 66 | "Interix", |
a09a320d JB |
67 | "HP/UX ELF", |
68 | "HP/UX SOM", | |
83461b86 | 69 | "QNX Neutrino", |
1762d96d | 70 | "Cygwin", |
1f82754b | 71 | "AIX", |
a15c5c83 | 72 | "DICOS", |
a80b95ba | 73 | "Darwin", |
78664fa3 | 74 | "Symbian", |
34864976 | 75 | "OpenVMS", |
d5367fe1 | 76 | "LynxOS178", |
cf0dbd6f | 77 | "Newlib", |
1762d96d | 78 | |
70f80edf JT |
79 | "<invalid>" |
80 | }; | |
81 | ||
82 | const char * | |
83 | gdbarch_osabi_name (enum gdb_osabi osabi) | |
84 | { | |
85 | if (osabi >= GDB_OSABI_UNKNOWN && osabi < GDB_OSABI_INVALID) | |
86 | return gdb_osabi_names[osabi]; | |
87 | ||
88 | return gdb_osabi_names[GDB_OSABI_INVALID]; | |
89 | } | |
90 | ||
08d16641 PA |
91 | /* Lookup the OS ABI corresponding to the specified target description |
92 | string. */ | |
93 | ||
94 | enum gdb_osabi | |
95 | osabi_from_tdesc_string (const char *name) | |
96 | { | |
97 | int i; | |
98 | ||
99 | for (i = 0; i < ARRAY_SIZE (gdb_osabi_names); i++) | |
100 | if (strcmp (name, gdb_osabi_names[i]) == 0) | |
101 | { | |
102 | /* See note above: the name table matches the indices assigned | |
103 | to enum gdb_osabi. */ | |
104 | enum gdb_osabi osabi = (enum gdb_osabi) i; | |
105 | ||
106 | if (osabi == GDB_OSABI_INVALID) | |
107 | return GDB_OSABI_UNKNOWN; | |
108 | else | |
109 | return osabi; | |
110 | } | |
111 | ||
112 | return GDB_OSABI_UNKNOWN; | |
113 | } | |
114 | ||
70f80edf JT |
115 | /* Handler for a given architecture/OS ABI pair. There should be only |
116 | one handler for a given OS ABI each architecture family. */ | |
117 | struct gdb_osabi_handler | |
118 | { | |
119 | struct gdb_osabi_handler *next; | |
05816f70 | 120 | const struct bfd_arch_info *arch_info; |
70f80edf JT |
121 | enum gdb_osabi osabi; |
122 | void (*init_osabi)(struct gdbarch_info, struct gdbarch *); | |
123 | }; | |
124 | ||
125 | static struct gdb_osabi_handler *gdb_osabi_handler_list; | |
126 | ||
127 | void | |
05816f70 MK |
128 | gdbarch_register_osabi (enum bfd_architecture arch, unsigned long machine, |
129 | enum gdb_osabi osabi, | |
70f80edf JT |
130 | void (*init_osabi)(struct gdbarch_info, |
131 | struct gdbarch *)) | |
132 | { | |
133 | struct gdb_osabi_handler **handler_p; | |
05816f70 | 134 | const struct bfd_arch_info *arch_info = bfd_lookup_arch (arch, machine); |
b00a8037 | 135 | const char **name_ptr; |
70f80edf JT |
136 | |
137 | /* Registering an OS ABI handler for "unknown" is not allowed. */ | |
138 | if (osabi == GDB_OSABI_UNKNOWN) | |
139 | { | |
140 | internal_error | |
141 | (__FILE__, __LINE__, | |
e2e0b3e5 | 142 | _("gdbarch_register_osabi: An attempt to register a handler for " |
70f80edf | 143 | "OS ABI \"%s\" for architecture %s was made. The handler will " |
e2e0b3e5 | 144 | "not be registered"), |
70f80edf | 145 | gdbarch_osabi_name (osabi), |
05816f70 | 146 | bfd_printable_arch_mach (arch, machine)); |
70f80edf JT |
147 | return; |
148 | } | |
149 | ||
05816f70 MK |
150 | gdb_assert (arch_info); |
151 | ||
70f80edf JT |
152 | for (handler_p = &gdb_osabi_handler_list; *handler_p != NULL; |
153 | handler_p = &(*handler_p)->next) | |
154 | { | |
05816f70 | 155 | if ((*handler_p)->arch_info == arch_info |
70f80edf JT |
156 | && (*handler_p)->osabi == osabi) |
157 | { | |
158 | internal_error | |
159 | (__FILE__, __LINE__, | |
e2e0b3e5 AC |
160 | _("gdbarch_register_osabi: A handler for OS ABI \"%s\" " |
161 | "has already been registered for architecture %s"), | |
70f80edf | 162 | gdbarch_osabi_name (osabi), |
05816f70 | 163 | arch_info->printable_name); |
70f80edf JT |
164 | /* If user wants to continue, override previous definition. */ |
165 | (*handler_p)->init_osabi = init_osabi; | |
166 | return; | |
167 | } | |
168 | } | |
169 | ||
170 | (*handler_p) | |
171 | = (struct gdb_osabi_handler *) xmalloc (sizeof (struct gdb_osabi_handler)); | |
172 | (*handler_p)->next = NULL; | |
05816f70 | 173 | (*handler_p)->arch_info = arch_info; |
70f80edf JT |
174 | (*handler_p)->osabi = osabi; |
175 | (*handler_p)->init_osabi = init_osabi; | |
b00a8037 DJ |
176 | |
177 | /* Add this OS ABI to the list of enum values for "set osabi", if it isn't | |
178 | already there. */ | |
179 | for (name_ptr = gdb_osabi_available_names; *name_ptr; name_ptr ++) | |
180 | { | |
181 | if (*name_ptr == gdbarch_osabi_name (osabi)) | |
182 | return; | |
183 | } | |
184 | *name_ptr++ = gdbarch_osabi_name (osabi); | |
185 | *name_ptr = NULL; | |
70f80edf JT |
186 | } |
187 | \f | |
188 | ||
0df8b418 | 189 | /* Sniffer to find the OS ABI for a given file's architecture and flavour. |
70f80edf JT |
190 | It is legal to have multiple sniffers for each arch/flavour pair, to |
191 | disambiguate one OS's a.out from another, for example. The first sniffer | |
192 | to return something other than GDB_OSABI_UNKNOWN wins, so a sniffer should | |
193 | be careful to claim a file only if it knows for sure what it is. */ | |
194 | struct gdb_osabi_sniffer | |
195 | { | |
196 | struct gdb_osabi_sniffer *next; | |
197 | enum bfd_architecture arch; /* bfd_arch_unknown == wildcard */ | |
198 | enum bfd_flavour flavour; | |
199 | enum gdb_osabi (*sniffer)(bfd *); | |
200 | }; | |
201 | ||
202 | static struct gdb_osabi_sniffer *gdb_osabi_sniffer_list; | |
203 | ||
204 | void | |
205 | gdbarch_register_osabi_sniffer (enum bfd_architecture arch, | |
206 | enum bfd_flavour flavour, | |
207 | enum gdb_osabi (*sniffer_fn)(bfd *)) | |
208 | { | |
209 | struct gdb_osabi_sniffer *sniffer; | |
210 | ||
211 | sniffer = | |
212 | (struct gdb_osabi_sniffer *) xmalloc (sizeof (struct gdb_osabi_sniffer)); | |
213 | sniffer->arch = arch; | |
214 | sniffer->flavour = flavour; | |
215 | sniffer->sniffer = sniffer_fn; | |
216 | ||
217 | sniffer->next = gdb_osabi_sniffer_list; | |
218 | gdb_osabi_sniffer_list = sniffer; | |
219 | } | |
220 | \f | |
221 | ||
222 | enum gdb_osabi | |
223 | gdbarch_lookup_osabi (bfd *abfd) | |
224 | { | |
225 | struct gdb_osabi_sniffer *sniffer; | |
226 | enum gdb_osabi osabi, match; | |
227 | int match_specific; | |
228 | ||
b00a8037 DJ |
229 | /* If we aren't in "auto" mode, return the specified OS ABI. */ |
230 | if (user_osabi_state == osabi_user) | |
231 | return user_selected_osabi; | |
232 | ||
08d16641 PA |
233 | /* If we don't have a binary, just return unknown. The caller may |
234 | have other sources the OSABI can be extracted from, e.g., the | |
235 | target description. */ | |
b00a8037 | 236 | if (abfd == NULL) |
08d16641 | 237 | return GDB_OSABI_UNKNOWN; |
4be87837 | 238 | |
70f80edf JT |
239 | match = GDB_OSABI_UNKNOWN; |
240 | match_specific = 0; | |
241 | ||
242 | for (sniffer = gdb_osabi_sniffer_list; sniffer != NULL; | |
243 | sniffer = sniffer->next) | |
244 | { | |
245 | if ((sniffer->arch == bfd_arch_unknown /* wildcard */ | |
246 | || sniffer->arch == bfd_get_arch (abfd)) | |
247 | && sniffer->flavour == bfd_get_flavour (abfd)) | |
248 | { | |
249 | osabi = (*sniffer->sniffer) (abfd); | |
250 | if (osabi < GDB_OSABI_UNKNOWN || osabi >= GDB_OSABI_INVALID) | |
251 | { | |
252 | internal_error | |
253 | (__FILE__, __LINE__, | |
e2e0b3e5 AC |
254 | _("gdbarch_lookup_osabi: invalid OS ABI (%d) from sniffer " |
255 | "for architecture %s flavour %d"), | |
70f80edf JT |
256 | (int) osabi, |
257 | bfd_printable_arch_mach (bfd_get_arch (abfd), 0), | |
258 | (int) bfd_get_flavour (abfd)); | |
259 | } | |
260 | else if (osabi != GDB_OSABI_UNKNOWN) | |
261 | { | |
262 | /* A specific sniffer always overrides a generic sniffer. | |
263 | Croak on multiple match if the two matches are of the | |
264 | same class. If the user wishes to continue, we'll use | |
265 | the first match. */ | |
266 | if (match != GDB_OSABI_UNKNOWN) | |
267 | { | |
268 | if ((match_specific && sniffer->arch != bfd_arch_unknown) | |
269 | || (!match_specific && sniffer->arch == bfd_arch_unknown)) | |
270 | { | |
271 | internal_error | |
272 | (__FILE__, __LINE__, | |
e2e0b3e5 | 273 | _("gdbarch_lookup_osabi: multiple %sspecific OS ABI " |
70f80edf | 274 | "match for architecture %s flavour %d: first " |
e2e0b3e5 | 275 | "match \"%s\", second match \"%s\""), |
70f80edf JT |
276 | match_specific ? "" : "non-", |
277 | bfd_printable_arch_mach (bfd_get_arch (abfd), 0), | |
278 | (int) bfd_get_flavour (abfd), | |
279 | gdbarch_osabi_name (match), | |
280 | gdbarch_osabi_name (osabi)); | |
281 | } | |
282 | else if (sniffer->arch != bfd_arch_unknown) | |
283 | { | |
284 | match = osabi; | |
285 | match_specific = 1; | |
286 | } | |
287 | } | |
288 | else | |
289 | { | |
290 | match = osabi; | |
291 | if (sniffer->arch != bfd_arch_unknown) | |
292 | match_specific = 1; | |
293 | } | |
294 | } | |
295 | } | |
296 | } | |
297 | ||
08d16641 | 298 | return match; |
70f80edf JT |
299 | } |
300 | ||
6cfae0bc JB |
301 | |
302 | /* Return non-zero if architecture A can run code written for | |
303 | architecture B. */ | |
304 | static int | |
305 | can_run_code_for (const struct bfd_arch_info *a, const struct bfd_arch_info *b) | |
306 | { | |
307 | /* BFD's 'A->compatible (A, B)' functions return zero if A and B are | |
308 | incompatible. But if they are compatible, it returns the 'more | |
309 | featureful' of the two arches. That is, if A can run code | |
310 | written for B, but B can't run code written for A, then it'll | |
311 | return A. | |
312 | ||
5f724446 AC |
313 | struct bfd_arch_info objects are singletons: that is, there's |
314 | supposed to be exactly one instance for a given machine. So you | |
315 | can tell whether two are equivalent by comparing pointers. */ | |
6cfae0bc JB |
316 | return (a == b || a->compatible (a, b) == a); |
317 | } | |
318 | ||
319 | ||
70f80edf | 320 | void |
4be87837 | 321 | gdbarch_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch) |
70f80edf | 322 | { |
05816f70 | 323 | struct gdb_osabi_handler *handler; |
70f80edf | 324 | |
4be87837 | 325 | if (info.osabi == GDB_OSABI_UNKNOWN) |
70f80edf | 326 | { |
01fc4e33 AC |
327 | /* Don't complain about an unknown OSABI. Assume the user knows |
328 | what they are doing. */ | |
70f80edf JT |
329 | return; |
330 | } | |
331 | ||
332 | for (handler = gdb_osabi_handler_list; handler != NULL; | |
333 | handler = handler->next) | |
334 | { | |
4be87837 | 335 | if (handler->osabi != info.osabi) |
05816f70 MK |
336 | continue; |
337 | ||
6cfae0bc JB |
338 | /* If the architecture described by ARCH_INFO can run code for |
339 | the architcture we registered the handler for, then the | |
340 | handler is applicable. Note, though, that if the handler is | |
341 | for an architecture that is a superset of ARCH_INFO, we can't | |
342 | use that --- it would be perfectly correct for it to install | |
343 | gdbarch methods that refer to registers / instructions / | |
344 | other facilities ARCH_INFO doesn't have. | |
05816f70 | 345 | |
6cfae0bc | 346 | NOTE: kettenis/20021027: There may be more than one machine |
05816f70 MK |
347 | type that is compatible with the desired machine type. Right |
348 | now we simply return the first match, which is fine for now. | |
349 | However, we might want to do something smarter in the future. */ | |
5f724446 AC |
350 | /* NOTE: cagney/2003-10-23: The code for "a can_run_code_for b" |
351 | is implemented using BFD's compatible method (a->compatible | |
352 | (b) == a -- the lowest common denominator between a and b is | |
353 | a). That method's definition of compatible may not be as you | |
ce2826aa | 354 | expect. For instance the test "amd64 can run code for i386" |
5f724446 | 355 | (or more generally "64-bit ISA can run code for the 32-bit |
ce2826aa AC |
356 | ISA"). BFD doesn't normally consider 32-bit and 64-bit |
357 | "compatible" so it doesn't succeed. */ | |
931758af | 358 | if (can_run_code_for (info.bfd_arch_info, handler->arch_info)) |
70f80edf JT |
359 | { |
360 | (*handler->init_osabi) (info, gdbarch); | |
361 | return; | |
362 | } | |
363 | } | |
364 | ||
e481341f JB |
365 | warning |
366 | ("A handler for the OS ABI \"%s\" is not built into this configuration\n" | |
367 | "of GDB. Attempting to continue with the default %s settings.\n", | |
368 | gdbarch_osabi_name (info.osabi), | |
369 | info.bfd_arch_info->printable_name); | |
70f80edf JT |
370 | } |
371 | \f | |
a49d618c MK |
372 | /* Limit on the amount of data to be read. */ |
373 | #define MAX_NOTESZ 128 | |
374 | ||
ea9f10bb TT |
375 | /* Return non-zero if NOTE matches NAME, DESCSZ and TYPE. If |
376 | *SECTSIZE is non-zero, then this reads that many bytes from | |
377 | the start of the section and clears *SECTSIZE. */ | |
a49d618c MK |
378 | |
379 | static int | |
ea9f10bb | 380 | check_note (bfd *abfd, asection *sect, char *note, unsigned int *sectsize, |
a49d618c MK |
381 | const char *name, unsigned long descsz, unsigned long type) |
382 | { | |
383 | unsigned long notesz; | |
384 | ||
ea9f10bb TT |
385 | if (*sectsize) |
386 | { | |
387 | if (!bfd_get_section_contents (abfd, sect, note, 0, *sectsize)) | |
388 | return 0; | |
389 | *sectsize = 0; | |
390 | } | |
391 | ||
a49d618c MK |
392 | /* Calculate the size of this note. */ |
393 | notesz = strlen (name) + 1; | |
394 | notesz = ((notesz + 3) & ~3); | |
395 | notesz += descsz; | |
396 | notesz = ((notesz + 3) & ~3); | |
397 | ||
398 | /* If this assertion triggers, increase MAX_NOTESZ. */ | |
399 | gdb_assert (notesz <= MAX_NOTESZ); | |
400 | ||
401 | /* Check whether SECT is big enough to comtain the complete note. */ | |
402 | if (notesz > bfd_section_size (abfd, sect)) | |
403 | return 0; | |
404 | ||
405 | /* Check the note name. */ | |
406 | if (bfd_h_get_32 (abfd, note) != (strlen (name) + 1) | |
407 | || strcmp (note + 12, name) != 0) | |
408 | return 0; | |
409 | ||
410 | /* Check the descriptor size. */ | |
411 | if (bfd_h_get_32 (abfd, note + 4) != descsz) | |
412 | return 0; | |
413 | ||
414 | /* Check the note type. */ | |
415 | if (bfd_h_get_32 (abfd, note + 8) != type) | |
416 | return 0; | |
417 | ||
418 | return 1; | |
419 | } | |
70f80edf JT |
420 | |
421 | /* Generic sniffer for ELF flavoured files. */ | |
422 | ||
423 | void | |
424 | generic_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect, void *obj) | |
425 | { | |
a49d618c | 426 | enum gdb_osabi *osabi = obj; |
70f80edf JT |
427 | const char *name; |
428 | unsigned int sectsize; | |
a49d618c | 429 | char *note; |
70f80edf JT |
430 | |
431 | name = bfd_get_section_name (abfd, sect); | |
432 | sectsize = bfd_section_size (abfd, sect); | |
433 | ||
a49d618c MK |
434 | /* Limit the amount of data to read. */ |
435 | if (sectsize > MAX_NOTESZ) | |
436 | sectsize = MAX_NOTESZ; | |
70f80edf | 437 | |
ea9f10bb TT |
438 | /* We lazily read the section data here. Since we use |
439 | BFD_DECOMPRESS, we can't use bfd_get_section_contents on a | |
440 | compressed section. But, since note sections are not compressed, | |
441 | deferring the reading until we recognize the section avoids any | |
442 | error. */ | |
a49d618c | 443 | note = alloca (sectsize); |
70f80edf | 444 | |
a49d618c MK |
445 | /* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */ |
446 | if (strcmp (name, ".note.ABI-tag") == 0) | |
447 | { | |
448 | /* GNU. */ | |
ea9f10bb | 449 | if (check_note (abfd, sect, note, §size, "GNU", 16, NT_GNU_ABI_TAG)) |
70f80edf | 450 | { |
a49d618c | 451 | unsigned int abi_tag = bfd_h_get_32 (abfd, note + 16); |
70f80edf | 452 | |
a49d618c | 453 | switch (abi_tag) |
70f80edf JT |
454 | { |
455 | case GNU_ABI_TAG_LINUX: | |
a49d618c | 456 | *osabi = GDB_OSABI_LINUX; |
70f80edf JT |
457 | break; |
458 | ||
459 | case GNU_ABI_TAG_HURD: | |
a49d618c | 460 | *osabi = GDB_OSABI_HURD; |
70f80edf JT |
461 | break; |
462 | ||
463 | case GNU_ABI_TAG_SOLARIS: | |
a49d618c | 464 | *osabi = GDB_OSABI_SOLARIS; |
70f80edf JT |
465 | break; |
466 | ||
261de166 | 467 | case GNU_ABI_TAG_FREEBSD: |
a49d618c | 468 | *osabi = GDB_OSABI_FREEBSD_ELF; |
261de166 | 469 | break; |
a49d618c | 470 | |
261de166 | 471 | case GNU_ABI_TAG_NETBSD: |
a49d618c | 472 | *osabi = GDB_OSABI_NETBSD_ELF; |
261de166 | 473 | break; |
a49d618c | 474 | |
70f80edf | 475 | default: |
3e43a32a MS |
476 | internal_error (__FILE__, __LINE__, |
477 | _("generic_elf_osabi_sniff_abi_tag_sections: " | |
478 | "unknown OS number %d"), | |
a49d618c | 479 | abi_tag); |
70f80edf JT |
480 | } |
481 | return; | |
482 | } | |
a49d618c MK |
483 | |
484 | /* FreeBSD. */ | |
ea9f10bb TT |
485 | if (check_note (abfd, sect, note, §size, "FreeBSD", 4, |
486 | NT_FREEBSD_ABI_TAG)) | |
70f80edf | 487 | { |
a49d618c MK |
488 | /* There is no need to check the version yet. */ |
489 | *osabi = GDB_OSABI_FREEBSD_ELF; | |
490 | return; | |
70f80edf | 491 | } |
a49d618c | 492 | |
70f80edf JT |
493 | return; |
494 | } | |
a49d618c | 495 | |
70f80edf | 496 | /* .note.netbsd.ident notes, used by NetBSD. */ |
a49d618c | 497 | if (strcmp (name, ".note.netbsd.ident") == 0 |
ea9f10bb | 498 | && check_note (abfd, sect, note, §size, "NetBSD", 4, NT_NETBSD_IDENT)) |
70f80edf | 499 | { |
a49d618c MK |
500 | /* There is no need to check the version yet. */ |
501 | *osabi = GDB_OSABI_NETBSD_ELF; | |
70f80edf JT |
502 | return; |
503 | } | |
597684c5 | 504 | |
642d8300 MK |
505 | /* .note.openbsd.ident notes, used by OpenBSD. */ |
506 | if (strcmp (name, ".note.openbsd.ident") == 0 | |
ea9f10bb TT |
507 | && check_note (abfd, sect, note, §size, "OpenBSD", 4, |
508 | NT_OPENBSD_IDENT)) | |
642d8300 MK |
509 | { |
510 | /* There is no need to check the version yet. */ | |
511 | *osabi = GDB_OSABI_OPENBSD_ELF; | |
512 | return; | |
513 | } | |
514 | ||
597684c5 | 515 | /* .note.netbsdcore.procinfo notes, used by NetBSD. */ |
a49d618c | 516 | if (strcmp (name, ".note.netbsdcore.procinfo") == 0) |
597684c5 | 517 | { |
a49d618c | 518 | *osabi = GDB_OSABI_NETBSD_ELF; |
597684c5 MK |
519 | return; |
520 | } | |
70f80edf JT |
521 | } |
522 | ||
523 | static enum gdb_osabi | |
524 | generic_elf_osabi_sniffer (bfd *abfd) | |
525 | { | |
526 | unsigned int elfosabi; | |
527 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; | |
528 | ||
529 | elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; | |
530 | ||
531 | switch (elfosabi) | |
532 | { | |
533 | case ELFOSABI_NONE: | |
59adf69e | 534 | case ELFOSABI_GNU: |
533f1d8f MK |
535 | /* When the EI_OSABI field in the ELF header is ELFOSABI_NONE |
536 | (0), then the ELF structures in the file are conforming to | |
537 | the base specification for that machine (there are no | |
538 | OS-specific extensions). In order to determine the real OS | |
efae1d92 JB |
539 | in use, we must look for OS-specific notes. |
540 | ||
541 | The same applies for ELFOSABI_GNU: this can mean GNU/Hurd, | |
542 | GNU/Linux, and possibly more. */ | |
70f80edf JT |
543 | bfd_map_over_sections (abfd, |
544 | generic_elf_osabi_sniff_abi_tag_sections, | |
545 | &osabi); | |
546 | break; | |
547 | ||
548 | case ELFOSABI_FREEBSD: | |
549 | osabi = GDB_OSABI_FREEBSD_ELF; | |
550 | break; | |
551 | ||
552 | case ELFOSABI_NETBSD: | |
553 | osabi = GDB_OSABI_NETBSD_ELF; | |
554 | break; | |
555 | ||
70f80edf JT |
556 | case ELFOSABI_SOLARIS: |
557 | osabi = GDB_OSABI_SOLARIS; | |
558 | break; | |
a09a320d JB |
559 | |
560 | case ELFOSABI_HPUX: | |
533f1d8f MK |
561 | /* For some reason the default value for the EI_OSABI field is |
562 | ELFOSABI_HPUX for all PA-RISC targets (with the exception of | |
563 | GNU/Linux). We use HP-UX ELF as the default, but let any | |
564 | OS-specific notes override this. */ | |
a09a320d | 565 | osabi = GDB_OSABI_HPUX_ELF; |
533f1d8f MK |
566 | bfd_map_over_sections (abfd, |
567 | generic_elf_osabi_sniff_abi_tag_sections, | |
568 | &osabi); | |
a09a320d | 569 | break; |
34864976 TG |
570 | |
571 | case ELFOSABI_OPENVMS: | |
572 | osabi = GDB_OSABI_OPENVMS; | |
573 | break; | |
70f80edf JT |
574 | } |
575 | ||
bb21884d MK |
576 | if (osabi == GDB_OSABI_UNKNOWN) |
577 | { | |
578 | /* The FreeBSD folks have been naughty; they stored the string | |
579 | "FreeBSD" in the padding of the e_ident field of the ELF | |
580 | header to "brand" their ELF binaries in FreeBSD 3.x. */ | |
1731e543 | 581 | if (memcmp (&elf_elfheader (abfd)->e_ident[8], |
6062517a | 582 | "FreeBSD", sizeof ("FreeBSD")) == 0) |
bb21884d MK |
583 | osabi = GDB_OSABI_FREEBSD_ELF; |
584 | } | |
585 | ||
70f80edf JT |
586 | return osabi; |
587 | } | |
588 | \f | |
b00a8037 DJ |
589 | static void |
590 | set_osabi (char *args, int from_tty, struct cmd_list_element *c) | |
591 | { | |
592 | struct gdbarch_info info; | |
70f80edf | 593 | |
b00a8037 DJ |
594 | if (strcmp (set_osabi_string, "auto") == 0) |
595 | user_osabi_state = osabi_auto; | |
596 | else if (strcmp (set_osabi_string, "default") == 0) | |
597 | { | |
598 | user_selected_osabi = GDB_OSABI_DEFAULT; | |
599 | user_osabi_state = osabi_user; | |
600 | } | |
601 | else if (strcmp (set_osabi_string, "none") == 0) | |
602 | { | |
603 | user_selected_osabi = GDB_OSABI_UNKNOWN; | |
604 | user_osabi_state = osabi_user; | |
605 | } | |
606 | else | |
607 | { | |
608 | int i; | |
5cc80db3 | 609 | |
b00a8037 DJ |
610 | for (i = 1; i < GDB_OSABI_INVALID; i++) |
611 | if (strcmp (set_osabi_string, gdbarch_osabi_name (i)) == 0) | |
612 | { | |
613 | user_selected_osabi = i; | |
614 | user_osabi_state = osabi_user; | |
615 | break; | |
616 | } | |
617 | if (i == GDB_OSABI_INVALID) | |
618 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 619 | _("Invalid OS ABI \"%s\" passed to command handler."), |
b00a8037 DJ |
620 | set_osabi_string); |
621 | } | |
622 | ||
623 | /* NOTE: At some point (true multiple architectures) we'll need to be more | |
624 | graceful here. */ | |
625 | gdbarch_info_init (&info); | |
626 | if (! gdbarch_update_p (info)) | |
e2e0b3e5 | 627 | internal_error (__FILE__, __LINE__, _("Updating OS ABI failed.")); |
b00a8037 DJ |
628 | } |
629 | ||
b9362cc7 | 630 | static void |
7ab04401 AC |
631 | show_osabi (struct ui_file *file, int from_tty, struct cmd_list_element *c, |
632 | const char *value) | |
b00a8037 DJ |
633 | { |
634 | if (user_osabi_state == osabi_auto) | |
7ab04401 | 635 | fprintf_filtered (file, |
3e43a32a MS |
636 | _("The current OS ABI is \"auto\" " |
637 | "(currently \"%s\").\n"), | |
e17c207e | 638 | gdbarch_osabi_name (gdbarch_osabi (get_current_arch ()))); |
b00a8037 | 639 | else |
7ab04401 AC |
640 | fprintf_filtered (file, _("The current OS ABI is \"%s\".\n"), |
641 | gdbarch_osabi_name (user_selected_osabi)); | |
b00a8037 DJ |
642 | |
643 | if (GDB_OSABI_DEFAULT != GDB_OSABI_UNKNOWN) | |
7ab04401 AC |
644 | fprintf_filtered (file, _("The default OS ABI is \"%s\".\n"), |
645 | gdbarch_osabi_name (GDB_OSABI_DEFAULT)); | |
b00a8037 DJ |
646 | } |
647 | \f | |
b9362cc7 AC |
648 | extern initialize_file_ftype _initialize_gdb_osabi; /* -Wmissing-prototype */ |
649 | ||
70f80edf JT |
650 | void |
651 | _initialize_gdb_osabi (void) | |
652 | { | |
653 | if (strcmp (gdb_osabi_names[GDB_OSABI_INVALID], "<invalid>") != 0) | |
654 | internal_error | |
655 | (__FILE__, __LINE__, | |
e2e0b3e5 | 656 | _("_initialize_gdb_osabi: gdb_osabi_names[] is inconsistent")); |
70f80edf JT |
657 | |
658 | /* Register a generic sniffer for ELF flavoured files. */ | |
659 | gdbarch_register_osabi_sniffer (bfd_arch_unknown, | |
660 | bfd_target_elf_flavour, | |
661 | generic_elf_osabi_sniffer); | |
b00a8037 | 662 | |
b00a8037 | 663 | /* Register the "set osabi" command. */ |
7ab04401 | 664 | add_setshow_enum_cmd ("osabi", class_support, gdb_osabi_available_names, |
3e43a32a MS |
665 | &set_osabi_string, |
666 | _("Set OS ABI of target."), | |
667 | _("Show OS ABI of target."), | |
668 | NULL, set_osabi, show_osabi, | |
7ab04401 | 669 | &setlist, &showlist); |
b00a8037 | 670 | user_osabi_state = osabi_auto; |
70f80edf | 671 | } |