Commit | Line | Data |
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70f80edf | 1 | /* OS ABI variant handling for GDB. |
533f1d8f | 2 | |
ecd75fc8 | 3 | Copyright (C) 2001-2014 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 | 21 | |
70f80edf | 22 | #include "osabi.h" |
b00a8037 DJ |
23 | #include "arch-utils.h" |
24 | #include "gdbcmd.h" | |
25 | #include "command.h" | |
70f80edf JT |
26 | |
27 | #include "elf-bfd.h" | |
28 | ||
b00a8037 DJ |
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; | |
70f80edf JT |
43 | |
44 | /* This table matches the indices assigned to enum gdb_osabi. Keep | |
45 | them in sync. */ | |
46 | static const char * const gdb_osabi_names[] = | |
47 | { | |
b00a8037 | 48 | "none", |
70f80edf JT |
49 | |
50 | "SVR4", | |
51 | "GNU/Hurd", | |
52 | "Solaris", | |
70f80edf JT |
53 | "GNU/Linux", |
54 | "FreeBSD a.out", | |
55 | "FreeBSD ELF", | |
56 | "NetBSD a.out", | |
57 | "NetBSD ELF", | |
d33b9831 | 58 | "OpenBSD ELF", |
70f80edf | 59 | "Windows CE", |
1029b7fa | 60 | "DJGPP", |
b96d0a4e | 61 | "Irix", |
a09a320d JB |
62 | "HP/UX ELF", |
63 | "HP/UX SOM", | |
83461b86 | 64 | "QNX Neutrino", |
1762d96d | 65 | "Cygwin", |
1f82754b | 66 | "AIX", |
a15c5c83 | 67 | "DICOS", |
a80b95ba | 68 | "Darwin", |
78664fa3 | 69 | "Symbian", |
34864976 | 70 | "OpenVMS", |
d5367fe1 | 71 | "LynxOS178", |
cf0dbd6f | 72 | "Newlib", |
1762d96d | 73 | |
70f80edf JT |
74 | "<invalid>" |
75 | }; | |
76 | ||
77 | const char * | |
78 | gdbarch_osabi_name (enum gdb_osabi osabi) | |
79 | { | |
80 | if (osabi >= GDB_OSABI_UNKNOWN && osabi < GDB_OSABI_INVALID) | |
81 | return gdb_osabi_names[osabi]; | |
82 | ||
83 | return gdb_osabi_names[GDB_OSABI_INVALID]; | |
84 | } | |
85 | ||
08d16641 PA |
86 | /* Lookup the OS ABI corresponding to the specified target description |
87 | string. */ | |
88 | ||
89 | enum gdb_osabi | |
90 | osabi_from_tdesc_string (const char *name) | |
91 | { | |
92 | int i; | |
93 | ||
94 | for (i = 0; i < ARRAY_SIZE (gdb_osabi_names); i++) | |
95 | if (strcmp (name, gdb_osabi_names[i]) == 0) | |
96 | { | |
97 | /* See note above: the name table matches the indices assigned | |
98 | to enum gdb_osabi. */ | |
99 | enum gdb_osabi osabi = (enum gdb_osabi) i; | |
100 | ||
101 | if (osabi == GDB_OSABI_INVALID) | |
102 | return GDB_OSABI_UNKNOWN; | |
103 | else | |
104 | return osabi; | |
105 | } | |
106 | ||
107 | return GDB_OSABI_UNKNOWN; | |
108 | } | |
109 | ||
70f80edf JT |
110 | /* Handler for a given architecture/OS ABI pair. There should be only |
111 | one handler for a given OS ABI each architecture family. */ | |
112 | struct gdb_osabi_handler | |
113 | { | |
114 | struct gdb_osabi_handler *next; | |
05816f70 | 115 | const struct bfd_arch_info *arch_info; |
70f80edf JT |
116 | enum gdb_osabi osabi; |
117 | void (*init_osabi)(struct gdbarch_info, struct gdbarch *); | |
118 | }; | |
119 | ||
120 | static struct gdb_osabi_handler *gdb_osabi_handler_list; | |
121 | ||
122 | void | |
05816f70 MK |
123 | gdbarch_register_osabi (enum bfd_architecture arch, unsigned long machine, |
124 | enum gdb_osabi osabi, | |
70f80edf JT |
125 | void (*init_osabi)(struct gdbarch_info, |
126 | struct gdbarch *)) | |
127 | { | |
128 | struct gdb_osabi_handler **handler_p; | |
05816f70 | 129 | const struct bfd_arch_info *arch_info = bfd_lookup_arch (arch, machine); |
b00a8037 | 130 | const char **name_ptr; |
70f80edf JT |
131 | |
132 | /* Registering an OS ABI handler for "unknown" is not allowed. */ | |
133 | if (osabi == GDB_OSABI_UNKNOWN) | |
134 | { | |
135 | internal_error | |
136 | (__FILE__, __LINE__, | |
e2e0b3e5 | 137 | _("gdbarch_register_osabi: An attempt to register a handler for " |
70f80edf | 138 | "OS ABI \"%s\" for architecture %s was made. The handler will " |
e2e0b3e5 | 139 | "not be registered"), |
70f80edf | 140 | gdbarch_osabi_name (osabi), |
05816f70 | 141 | bfd_printable_arch_mach (arch, machine)); |
70f80edf JT |
142 | return; |
143 | } | |
144 | ||
05816f70 MK |
145 | gdb_assert (arch_info); |
146 | ||
70f80edf JT |
147 | for (handler_p = &gdb_osabi_handler_list; *handler_p != NULL; |
148 | handler_p = &(*handler_p)->next) | |
149 | { | |
05816f70 | 150 | if ((*handler_p)->arch_info == arch_info |
70f80edf JT |
151 | && (*handler_p)->osabi == osabi) |
152 | { | |
153 | internal_error | |
154 | (__FILE__, __LINE__, | |
e2e0b3e5 AC |
155 | _("gdbarch_register_osabi: A handler for OS ABI \"%s\" " |
156 | "has already been registered for architecture %s"), | |
70f80edf | 157 | gdbarch_osabi_name (osabi), |
05816f70 | 158 | arch_info->printable_name); |
70f80edf JT |
159 | /* If user wants to continue, override previous definition. */ |
160 | (*handler_p)->init_osabi = init_osabi; | |
161 | return; | |
162 | } | |
163 | } | |
164 | ||
165 | (*handler_p) | |
166 | = (struct gdb_osabi_handler *) xmalloc (sizeof (struct gdb_osabi_handler)); | |
167 | (*handler_p)->next = NULL; | |
05816f70 | 168 | (*handler_p)->arch_info = arch_info; |
70f80edf JT |
169 | (*handler_p)->osabi = osabi; |
170 | (*handler_p)->init_osabi = init_osabi; | |
b00a8037 DJ |
171 | |
172 | /* Add this OS ABI to the list of enum values for "set osabi", if it isn't | |
173 | already there. */ | |
174 | for (name_ptr = gdb_osabi_available_names; *name_ptr; name_ptr ++) | |
175 | { | |
176 | if (*name_ptr == gdbarch_osabi_name (osabi)) | |
177 | return; | |
178 | } | |
179 | *name_ptr++ = gdbarch_osabi_name (osabi); | |
180 | *name_ptr = NULL; | |
70f80edf JT |
181 | } |
182 | \f | |
183 | ||
0df8b418 | 184 | /* Sniffer to find the OS ABI for a given file's architecture and flavour. |
70f80edf JT |
185 | It is legal to have multiple sniffers for each arch/flavour pair, to |
186 | disambiguate one OS's a.out from another, for example. The first sniffer | |
187 | to return something other than GDB_OSABI_UNKNOWN wins, so a sniffer should | |
188 | be careful to claim a file only if it knows for sure what it is. */ | |
189 | struct gdb_osabi_sniffer | |
190 | { | |
191 | struct gdb_osabi_sniffer *next; | |
192 | enum bfd_architecture arch; /* bfd_arch_unknown == wildcard */ | |
193 | enum bfd_flavour flavour; | |
194 | enum gdb_osabi (*sniffer)(bfd *); | |
195 | }; | |
196 | ||
197 | static struct gdb_osabi_sniffer *gdb_osabi_sniffer_list; | |
198 | ||
199 | void | |
200 | gdbarch_register_osabi_sniffer (enum bfd_architecture arch, | |
201 | enum bfd_flavour flavour, | |
202 | enum gdb_osabi (*sniffer_fn)(bfd *)) | |
203 | { | |
204 | struct gdb_osabi_sniffer *sniffer; | |
205 | ||
206 | sniffer = | |
207 | (struct gdb_osabi_sniffer *) xmalloc (sizeof (struct gdb_osabi_sniffer)); | |
208 | sniffer->arch = arch; | |
209 | sniffer->flavour = flavour; | |
210 | sniffer->sniffer = sniffer_fn; | |
211 | ||
212 | sniffer->next = gdb_osabi_sniffer_list; | |
213 | gdb_osabi_sniffer_list = sniffer; | |
214 | } | |
215 | \f | |
216 | ||
217 | enum gdb_osabi | |
218 | gdbarch_lookup_osabi (bfd *abfd) | |
219 | { | |
220 | struct gdb_osabi_sniffer *sniffer; | |
221 | enum gdb_osabi osabi, match; | |
222 | int match_specific; | |
223 | ||
b00a8037 DJ |
224 | /* If we aren't in "auto" mode, return the specified OS ABI. */ |
225 | if (user_osabi_state == osabi_user) | |
226 | return user_selected_osabi; | |
227 | ||
08d16641 PA |
228 | /* If we don't have a binary, just return unknown. The caller may |
229 | have other sources the OSABI can be extracted from, e.g., the | |
230 | target description. */ | |
b00a8037 | 231 | if (abfd == NULL) |
08d16641 | 232 | return GDB_OSABI_UNKNOWN; |
4be87837 | 233 | |
70f80edf JT |
234 | match = GDB_OSABI_UNKNOWN; |
235 | match_specific = 0; | |
236 | ||
237 | for (sniffer = gdb_osabi_sniffer_list; sniffer != NULL; | |
238 | sniffer = sniffer->next) | |
239 | { | |
240 | if ((sniffer->arch == bfd_arch_unknown /* wildcard */ | |
241 | || sniffer->arch == bfd_get_arch (abfd)) | |
242 | && sniffer->flavour == bfd_get_flavour (abfd)) | |
243 | { | |
244 | osabi = (*sniffer->sniffer) (abfd); | |
245 | if (osabi < GDB_OSABI_UNKNOWN || osabi >= GDB_OSABI_INVALID) | |
246 | { | |
247 | internal_error | |
248 | (__FILE__, __LINE__, | |
e2e0b3e5 AC |
249 | _("gdbarch_lookup_osabi: invalid OS ABI (%d) from sniffer " |
250 | "for architecture %s flavour %d"), | |
70f80edf JT |
251 | (int) osabi, |
252 | bfd_printable_arch_mach (bfd_get_arch (abfd), 0), | |
253 | (int) bfd_get_flavour (abfd)); | |
254 | } | |
255 | else if (osabi != GDB_OSABI_UNKNOWN) | |
256 | { | |
257 | /* A specific sniffer always overrides a generic sniffer. | |
258 | Croak on multiple match if the two matches are of the | |
259 | same class. If the user wishes to continue, we'll use | |
260 | the first match. */ | |
261 | if (match != GDB_OSABI_UNKNOWN) | |
262 | { | |
263 | if ((match_specific && sniffer->arch != bfd_arch_unknown) | |
264 | || (!match_specific && sniffer->arch == bfd_arch_unknown)) | |
265 | { | |
266 | internal_error | |
267 | (__FILE__, __LINE__, | |
e2e0b3e5 | 268 | _("gdbarch_lookup_osabi: multiple %sspecific OS ABI " |
70f80edf | 269 | "match for architecture %s flavour %d: first " |
e2e0b3e5 | 270 | "match \"%s\", second match \"%s\""), |
70f80edf JT |
271 | match_specific ? "" : "non-", |
272 | bfd_printable_arch_mach (bfd_get_arch (abfd), 0), | |
273 | (int) bfd_get_flavour (abfd), | |
274 | gdbarch_osabi_name (match), | |
275 | gdbarch_osabi_name (osabi)); | |
276 | } | |
277 | else if (sniffer->arch != bfd_arch_unknown) | |
278 | { | |
279 | match = osabi; | |
280 | match_specific = 1; | |
281 | } | |
282 | } | |
283 | else | |
284 | { | |
285 | match = osabi; | |
286 | if (sniffer->arch != bfd_arch_unknown) | |
287 | match_specific = 1; | |
288 | } | |
289 | } | |
290 | } | |
291 | } | |
292 | ||
08d16641 | 293 | return match; |
70f80edf JT |
294 | } |
295 | ||
6cfae0bc JB |
296 | |
297 | /* Return non-zero if architecture A can run code written for | |
298 | architecture B. */ | |
299 | static int | |
300 | can_run_code_for (const struct bfd_arch_info *a, const struct bfd_arch_info *b) | |
301 | { | |
302 | /* BFD's 'A->compatible (A, B)' functions return zero if A and B are | |
303 | incompatible. But if they are compatible, it returns the 'more | |
304 | featureful' of the two arches. That is, if A can run code | |
305 | written for B, but B can't run code written for A, then it'll | |
306 | return A. | |
307 | ||
5f724446 AC |
308 | struct bfd_arch_info objects are singletons: that is, there's |
309 | supposed to be exactly one instance for a given machine. So you | |
310 | can tell whether two are equivalent by comparing pointers. */ | |
6cfae0bc JB |
311 | return (a == b || a->compatible (a, b) == a); |
312 | } | |
313 | ||
314 | ||
70f80edf | 315 | void |
4be87837 | 316 | gdbarch_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch) |
70f80edf | 317 | { |
05816f70 | 318 | struct gdb_osabi_handler *handler; |
70f80edf | 319 | |
4be87837 | 320 | if (info.osabi == GDB_OSABI_UNKNOWN) |
70f80edf | 321 | { |
01fc4e33 AC |
322 | /* Don't complain about an unknown OSABI. Assume the user knows |
323 | what they are doing. */ | |
70f80edf JT |
324 | return; |
325 | } | |
326 | ||
327 | for (handler = gdb_osabi_handler_list; handler != NULL; | |
328 | handler = handler->next) | |
329 | { | |
4be87837 | 330 | if (handler->osabi != info.osabi) |
05816f70 MK |
331 | continue; |
332 | ||
6cfae0bc JB |
333 | /* If the architecture described by ARCH_INFO can run code for |
334 | the architcture we registered the handler for, then the | |
335 | handler is applicable. Note, though, that if the handler is | |
336 | for an architecture that is a superset of ARCH_INFO, we can't | |
337 | use that --- it would be perfectly correct for it to install | |
338 | gdbarch methods that refer to registers / instructions / | |
339 | other facilities ARCH_INFO doesn't have. | |
05816f70 | 340 | |
6cfae0bc | 341 | NOTE: kettenis/20021027: There may be more than one machine |
05816f70 MK |
342 | type that is compatible with the desired machine type. Right |
343 | now we simply return the first match, which is fine for now. | |
344 | However, we might want to do something smarter in the future. */ | |
5f724446 AC |
345 | /* NOTE: cagney/2003-10-23: The code for "a can_run_code_for b" |
346 | is implemented using BFD's compatible method (a->compatible | |
347 | (b) == a -- the lowest common denominator between a and b is | |
348 | a). That method's definition of compatible may not be as you | |
ce2826aa | 349 | expect. For instance the test "amd64 can run code for i386" |
5f724446 | 350 | (or more generally "64-bit ISA can run code for the 32-bit |
ce2826aa AC |
351 | ISA"). BFD doesn't normally consider 32-bit and 64-bit |
352 | "compatible" so it doesn't succeed. */ | |
931758af | 353 | if (can_run_code_for (info.bfd_arch_info, handler->arch_info)) |
70f80edf JT |
354 | { |
355 | (*handler->init_osabi) (info, gdbarch); | |
356 | return; | |
357 | } | |
358 | } | |
359 | ||
e481341f JB |
360 | warning |
361 | ("A handler for the OS ABI \"%s\" is not built into this configuration\n" | |
362 | "of GDB. Attempting to continue with the default %s settings.\n", | |
363 | gdbarch_osabi_name (info.osabi), | |
364 | info.bfd_arch_info->printable_name); | |
70f80edf JT |
365 | } |
366 | \f | |
a49d618c MK |
367 | /* Limit on the amount of data to be read. */ |
368 | #define MAX_NOTESZ 128 | |
369 | ||
ea9f10bb TT |
370 | /* Return non-zero if NOTE matches NAME, DESCSZ and TYPE. If |
371 | *SECTSIZE is non-zero, then this reads that many bytes from | |
372 | the start of the section and clears *SECTSIZE. */ | |
a49d618c MK |
373 | |
374 | static int | |
ea9f10bb | 375 | check_note (bfd *abfd, asection *sect, char *note, unsigned int *sectsize, |
a49d618c MK |
376 | const char *name, unsigned long descsz, unsigned long type) |
377 | { | |
378 | unsigned long notesz; | |
379 | ||
ea9f10bb TT |
380 | if (*sectsize) |
381 | { | |
382 | if (!bfd_get_section_contents (abfd, sect, note, 0, *sectsize)) | |
383 | return 0; | |
384 | *sectsize = 0; | |
385 | } | |
386 | ||
a49d618c MK |
387 | /* Calculate the size of this note. */ |
388 | notesz = strlen (name) + 1; | |
389 | notesz = ((notesz + 3) & ~3); | |
390 | notesz += descsz; | |
391 | notesz = ((notesz + 3) & ~3); | |
392 | ||
393 | /* If this assertion triggers, increase MAX_NOTESZ. */ | |
394 | gdb_assert (notesz <= MAX_NOTESZ); | |
395 | ||
396 | /* Check whether SECT is big enough to comtain the complete note. */ | |
397 | if (notesz > bfd_section_size (abfd, sect)) | |
398 | return 0; | |
399 | ||
400 | /* Check the note name. */ | |
401 | if (bfd_h_get_32 (abfd, note) != (strlen (name) + 1) | |
402 | || strcmp (note + 12, name) != 0) | |
403 | return 0; | |
404 | ||
405 | /* Check the descriptor size. */ | |
406 | if (bfd_h_get_32 (abfd, note + 4) != descsz) | |
407 | return 0; | |
408 | ||
409 | /* Check the note type. */ | |
410 | if (bfd_h_get_32 (abfd, note + 8) != type) | |
411 | return 0; | |
412 | ||
413 | return 1; | |
414 | } | |
70f80edf JT |
415 | |
416 | /* Generic sniffer for ELF flavoured files. */ | |
417 | ||
418 | void | |
419 | generic_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect, void *obj) | |
420 | { | |
a49d618c | 421 | enum gdb_osabi *osabi = obj; |
70f80edf JT |
422 | const char *name; |
423 | unsigned int sectsize; | |
a49d618c | 424 | char *note; |
70f80edf JT |
425 | |
426 | name = bfd_get_section_name (abfd, sect); | |
427 | sectsize = bfd_section_size (abfd, sect); | |
428 | ||
a49d618c MK |
429 | /* Limit the amount of data to read. */ |
430 | if (sectsize > MAX_NOTESZ) | |
431 | sectsize = MAX_NOTESZ; | |
70f80edf | 432 | |
ea9f10bb TT |
433 | /* We lazily read the section data here. Since we use |
434 | BFD_DECOMPRESS, we can't use bfd_get_section_contents on a | |
435 | compressed section. But, since note sections are not compressed, | |
436 | deferring the reading until we recognize the section avoids any | |
437 | error. */ | |
a49d618c | 438 | note = alloca (sectsize); |
70f80edf | 439 | |
a49d618c MK |
440 | /* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */ |
441 | if (strcmp (name, ".note.ABI-tag") == 0) | |
442 | { | |
443 | /* GNU. */ | |
ea9f10bb | 444 | if (check_note (abfd, sect, note, §size, "GNU", 16, NT_GNU_ABI_TAG)) |
70f80edf | 445 | { |
a49d618c | 446 | unsigned int abi_tag = bfd_h_get_32 (abfd, note + 16); |
70f80edf | 447 | |
a49d618c | 448 | switch (abi_tag) |
70f80edf JT |
449 | { |
450 | case GNU_ABI_TAG_LINUX: | |
a49d618c | 451 | *osabi = GDB_OSABI_LINUX; |
70f80edf JT |
452 | break; |
453 | ||
454 | case GNU_ABI_TAG_HURD: | |
a49d618c | 455 | *osabi = GDB_OSABI_HURD; |
70f80edf JT |
456 | break; |
457 | ||
458 | case GNU_ABI_TAG_SOLARIS: | |
a49d618c | 459 | *osabi = GDB_OSABI_SOLARIS; |
70f80edf JT |
460 | break; |
461 | ||
261de166 | 462 | case GNU_ABI_TAG_FREEBSD: |
a49d618c | 463 | *osabi = GDB_OSABI_FREEBSD_ELF; |
261de166 | 464 | break; |
a49d618c | 465 | |
261de166 | 466 | case GNU_ABI_TAG_NETBSD: |
a49d618c | 467 | *osabi = GDB_OSABI_NETBSD_ELF; |
261de166 | 468 | break; |
a49d618c | 469 | |
70f80edf | 470 | default: |
3e43a32a MS |
471 | internal_error (__FILE__, __LINE__, |
472 | _("generic_elf_osabi_sniff_abi_tag_sections: " | |
473 | "unknown OS number %d"), | |
a49d618c | 474 | abi_tag); |
70f80edf JT |
475 | } |
476 | return; | |
477 | } | |
a49d618c MK |
478 | |
479 | /* FreeBSD. */ | |
ea9f10bb TT |
480 | if (check_note (abfd, sect, note, §size, "FreeBSD", 4, |
481 | NT_FREEBSD_ABI_TAG)) | |
70f80edf | 482 | { |
a49d618c MK |
483 | /* There is no need to check the version yet. */ |
484 | *osabi = GDB_OSABI_FREEBSD_ELF; | |
485 | return; | |
70f80edf | 486 | } |
a49d618c | 487 | |
70f80edf JT |
488 | return; |
489 | } | |
a49d618c | 490 | |
70f80edf | 491 | /* .note.netbsd.ident notes, used by NetBSD. */ |
a49d618c | 492 | if (strcmp (name, ".note.netbsd.ident") == 0 |
ea9f10bb | 493 | && check_note (abfd, sect, note, §size, "NetBSD", 4, NT_NETBSD_IDENT)) |
70f80edf | 494 | { |
a49d618c MK |
495 | /* There is no need to check the version yet. */ |
496 | *osabi = GDB_OSABI_NETBSD_ELF; | |
70f80edf JT |
497 | return; |
498 | } | |
597684c5 | 499 | |
642d8300 MK |
500 | /* .note.openbsd.ident notes, used by OpenBSD. */ |
501 | if (strcmp (name, ".note.openbsd.ident") == 0 | |
ea9f10bb TT |
502 | && check_note (abfd, sect, note, §size, "OpenBSD", 4, |
503 | NT_OPENBSD_IDENT)) | |
642d8300 MK |
504 | { |
505 | /* There is no need to check the version yet. */ | |
506 | *osabi = GDB_OSABI_OPENBSD_ELF; | |
507 | return; | |
508 | } | |
509 | ||
597684c5 | 510 | /* .note.netbsdcore.procinfo notes, used by NetBSD. */ |
a49d618c | 511 | if (strcmp (name, ".note.netbsdcore.procinfo") == 0) |
597684c5 | 512 | { |
a49d618c | 513 | *osabi = GDB_OSABI_NETBSD_ELF; |
597684c5 MK |
514 | return; |
515 | } | |
70f80edf JT |
516 | } |
517 | ||
518 | static enum gdb_osabi | |
519 | generic_elf_osabi_sniffer (bfd *abfd) | |
520 | { | |
521 | unsigned int elfosabi; | |
522 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; | |
523 | ||
524 | elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; | |
525 | ||
526 | switch (elfosabi) | |
527 | { | |
528 | case ELFOSABI_NONE: | |
59adf69e | 529 | case ELFOSABI_GNU: |
533f1d8f MK |
530 | /* When the EI_OSABI field in the ELF header is ELFOSABI_NONE |
531 | (0), then the ELF structures in the file are conforming to | |
532 | the base specification for that machine (there are no | |
533 | OS-specific extensions). In order to determine the real OS | |
efae1d92 JB |
534 | in use, we must look for OS-specific notes. |
535 | ||
536 | The same applies for ELFOSABI_GNU: this can mean GNU/Hurd, | |
537 | GNU/Linux, and possibly more. */ | |
70f80edf JT |
538 | bfd_map_over_sections (abfd, |
539 | generic_elf_osabi_sniff_abi_tag_sections, | |
540 | &osabi); | |
541 | break; | |
542 | ||
543 | case ELFOSABI_FREEBSD: | |
544 | osabi = GDB_OSABI_FREEBSD_ELF; | |
545 | break; | |
546 | ||
547 | case ELFOSABI_NETBSD: | |
548 | osabi = GDB_OSABI_NETBSD_ELF; | |
549 | break; | |
550 | ||
70f80edf JT |
551 | case ELFOSABI_SOLARIS: |
552 | osabi = GDB_OSABI_SOLARIS; | |
553 | break; | |
a09a320d JB |
554 | |
555 | case ELFOSABI_HPUX: | |
533f1d8f MK |
556 | /* For some reason the default value for the EI_OSABI field is |
557 | ELFOSABI_HPUX for all PA-RISC targets (with the exception of | |
558 | GNU/Linux). We use HP-UX ELF as the default, but let any | |
559 | OS-specific notes override this. */ | |
a09a320d | 560 | osabi = GDB_OSABI_HPUX_ELF; |
533f1d8f MK |
561 | bfd_map_over_sections (abfd, |
562 | generic_elf_osabi_sniff_abi_tag_sections, | |
563 | &osabi); | |
a09a320d | 564 | break; |
34864976 TG |
565 | |
566 | case ELFOSABI_OPENVMS: | |
567 | osabi = GDB_OSABI_OPENVMS; | |
568 | break; | |
70f80edf JT |
569 | } |
570 | ||
bb21884d MK |
571 | if (osabi == GDB_OSABI_UNKNOWN) |
572 | { | |
573 | /* The FreeBSD folks have been naughty; they stored the string | |
574 | "FreeBSD" in the padding of the e_ident field of the ELF | |
575 | header to "brand" their ELF binaries in FreeBSD 3.x. */ | |
1731e543 | 576 | if (memcmp (&elf_elfheader (abfd)->e_ident[8], |
6062517a | 577 | "FreeBSD", sizeof ("FreeBSD")) == 0) |
bb21884d MK |
578 | osabi = GDB_OSABI_FREEBSD_ELF; |
579 | } | |
580 | ||
70f80edf JT |
581 | return osabi; |
582 | } | |
583 | \f | |
b00a8037 DJ |
584 | static void |
585 | set_osabi (char *args, int from_tty, struct cmd_list_element *c) | |
586 | { | |
587 | struct gdbarch_info info; | |
70f80edf | 588 | |
b00a8037 DJ |
589 | if (strcmp (set_osabi_string, "auto") == 0) |
590 | user_osabi_state = osabi_auto; | |
591 | else if (strcmp (set_osabi_string, "default") == 0) | |
592 | { | |
593 | user_selected_osabi = GDB_OSABI_DEFAULT; | |
594 | user_osabi_state = osabi_user; | |
595 | } | |
596 | else if (strcmp (set_osabi_string, "none") == 0) | |
597 | { | |
598 | user_selected_osabi = GDB_OSABI_UNKNOWN; | |
599 | user_osabi_state = osabi_user; | |
600 | } | |
601 | else | |
602 | { | |
603 | int i; | |
5cc80db3 | 604 | |
b00a8037 DJ |
605 | for (i = 1; i < GDB_OSABI_INVALID; i++) |
606 | if (strcmp (set_osabi_string, gdbarch_osabi_name (i)) == 0) | |
607 | { | |
608 | user_selected_osabi = i; | |
609 | user_osabi_state = osabi_user; | |
610 | break; | |
611 | } | |
612 | if (i == GDB_OSABI_INVALID) | |
613 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 614 | _("Invalid OS ABI \"%s\" passed to command handler."), |
b00a8037 DJ |
615 | set_osabi_string); |
616 | } | |
617 | ||
618 | /* NOTE: At some point (true multiple architectures) we'll need to be more | |
619 | graceful here. */ | |
620 | gdbarch_info_init (&info); | |
621 | if (! gdbarch_update_p (info)) | |
e2e0b3e5 | 622 | internal_error (__FILE__, __LINE__, _("Updating OS ABI failed.")); |
b00a8037 DJ |
623 | } |
624 | ||
b9362cc7 | 625 | static void |
7ab04401 AC |
626 | show_osabi (struct ui_file *file, int from_tty, struct cmd_list_element *c, |
627 | const char *value) | |
b00a8037 DJ |
628 | { |
629 | if (user_osabi_state == osabi_auto) | |
7ab04401 | 630 | fprintf_filtered (file, |
3e43a32a MS |
631 | _("The current OS ABI is \"auto\" " |
632 | "(currently \"%s\").\n"), | |
e17c207e | 633 | gdbarch_osabi_name (gdbarch_osabi (get_current_arch ()))); |
b00a8037 | 634 | else |
7ab04401 AC |
635 | fprintf_filtered (file, _("The current OS ABI is \"%s\".\n"), |
636 | gdbarch_osabi_name (user_selected_osabi)); | |
b00a8037 DJ |
637 | |
638 | if (GDB_OSABI_DEFAULT != GDB_OSABI_UNKNOWN) | |
7ab04401 AC |
639 | fprintf_filtered (file, _("The default OS ABI is \"%s\".\n"), |
640 | gdbarch_osabi_name (GDB_OSABI_DEFAULT)); | |
b00a8037 DJ |
641 | } |
642 | \f | |
b9362cc7 AC |
643 | extern initialize_file_ftype _initialize_gdb_osabi; /* -Wmissing-prototype */ |
644 | ||
70f80edf JT |
645 | void |
646 | _initialize_gdb_osabi (void) | |
647 | { | |
648 | if (strcmp (gdb_osabi_names[GDB_OSABI_INVALID], "<invalid>") != 0) | |
649 | internal_error | |
650 | (__FILE__, __LINE__, | |
e2e0b3e5 | 651 | _("_initialize_gdb_osabi: gdb_osabi_names[] is inconsistent")); |
70f80edf JT |
652 | |
653 | /* Register a generic sniffer for ELF flavoured files. */ | |
654 | gdbarch_register_osabi_sniffer (bfd_arch_unknown, | |
655 | bfd_target_elf_flavour, | |
656 | generic_elf_osabi_sniffer); | |
b00a8037 | 657 | |
b00a8037 | 658 | /* Register the "set osabi" command. */ |
7ab04401 | 659 | add_setshow_enum_cmd ("osabi", class_support, gdb_osabi_available_names, |
3e43a32a MS |
660 | &set_osabi_string, |
661 | _("Set OS ABI of target."), | |
662 | _("Show OS ABI of target."), | |
663 | NULL, set_osabi, show_osabi, | |
7ab04401 | 664 | &setlist, &showlist); |
b00a8037 | 665 | user_osabi_state = osabi_auto; |
70f80edf | 666 | } |