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70f80edf JT |
1 | /* OS ABI variant handling for GDB. |
2 | Copyright 2001, 2002 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "defs.h" | |
309367d4 | 22 | #include "gdb_string.h" |
70f80edf JT |
23 | #include "osabi.h" |
24 | ||
25 | #include "elf-bfd.h" | |
26 | ||
27 | ||
28 | /* This table matches the indices assigned to enum gdb_osabi. Keep | |
29 | them in sync. */ | |
30 | static const char * const gdb_osabi_names[] = | |
31 | { | |
32 | "<unknown>", | |
33 | ||
34 | "SVR4", | |
35 | "GNU/Hurd", | |
36 | "Solaris", | |
37 | "OSF/1", | |
38 | "GNU/Linux", | |
39 | "FreeBSD a.out", | |
40 | "FreeBSD ELF", | |
41 | "NetBSD a.out", | |
42 | "NetBSD ELF", | |
43 | "Windows CE", | |
1029b7fa MK |
44 | "DJGPP", |
45 | "NetWare", | |
b96d0a4e | 46 | "Irix", |
daa66587 | 47 | "LynxOS", |
e64f66d1 | 48 | "Interix", |
70f80edf JT |
49 | |
50 | "ARM EABI v1", | |
51 | "ARM EABI v2", | |
52 | "ARM APCS", | |
53 | ||
54 | "<invalid>" | |
55 | }; | |
56 | ||
57 | const char * | |
58 | gdbarch_osabi_name (enum gdb_osabi osabi) | |
59 | { | |
60 | if (osabi >= GDB_OSABI_UNKNOWN && osabi < GDB_OSABI_INVALID) | |
61 | return gdb_osabi_names[osabi]; | |
62 | ||
63 | return gdb_osabi_names[GDB_OSABI_INVALID]; | |
64 | } | |
65 | ||
66 | /* Handler for a given architecture/OS ABI pair. There should be only | |
67 | one handler for a given OS ABI each architecture family. */ | |
68 | struct gdb_osabi_handler | |
69 | { | |
70 | struct gdb_osabi_handler *next; | |
71 | enum bfd_architecture arch; | |
72 | enum gdb_osabi osabi; | |
73 | void (*init_osabi)(struct gdbarch_info, struct gdbarch *); | |
74 | }; | |
75 | ||
76 | static struct gdb_osabi_handler *gdb_osabi_handler_list; | |
77 | ||
78 | void | |
79 | gdbarch_register_osabi (enum bfd_architecture arch, enum gdb_osabi osabi, | |
80 | void (*init_osabi)(struct gdbarch_info, | |
81 | struct gdbarch *)) | |
82 | { | |
83 | struct gdb_osabi_handler **handler_p; | |
84 | ||
85 | /* Registering an OS ABI handler for "unknown" is not allowed. */ | |
86 | if (osabi == GDB_OSABI_UNKNOWN) | |
87 | { | |
88 | internal_error | |
89 | (__FILE__, __LINE__, | |
90 | "gdbarch_register_osabi: An attempt to register a handler for " | |
91 | "OS ABI \"%s\" for architecture %s was made. The handler will " | |
92 | "not be registered", | |
93 | gdbarch_osabi_name (osabi), | |
94 | bfd_printable_arch_mach (arch, 0)); | |
95 | return; | |
96 | } | |
97 | ||
98 | for (handler_p = &gdb_osabi_handler_list; *handler_p != NULL; | |
99 | handler_p = &(*handler_p)->next) | |
100 | { | |
101 | if ((*handler_p)->arch == arch | |
102 | && (*handler_p)->osabi == osabi) | |
103 | { | |
104 | internal_error | |
105 | (__FILE__, __LINE__, | |
106 | "gdbarch_register_osabi: A handler for OS ABI \"%s\" " | |
107 | "has already been registered for architecture %s", | |
108 | gdbarch_osabi_name (osabi), | |
109 | bfd_printable_arch_mach (arch, 0)); | |
110 | /* If user wants to continue, override previous definition. */ | |
111 | (*handler_p)->init_osabi = init_osabi; | |
112 | return; | |
113 | } | |
114 | } | |
115 | ||
116 | (*handler_p) | |
117 | = (struct gdb_osabi_handler *) xmalloc (sizeof (struct gdb_osabi_handler)); | |
118 | (*handler_p)->next = NULL; | |
119 | (*handler_p)->arch = arch; | |
120 | (*handler_p)->osabi = osabi; | |
121 | (*handler_p)->init_osabi = init_osabi; | |
122 | } | |
123 | \f | |
124 | ||
125 | /* Sniffer to find the OS ABI for a given file's architecture and flavour. | |
126 | It is legal to have multiple sniffers for each arch/flavour pair, to | |
127 | disambiguate one OS's a.out from another, for example. The first sniffer | |
128 | to return something other than GDB_OSABI_UNKNOWN wins, so a sniffer should | |
129 | be careful to claim a file only if it knows for sure what it is. */ | |
130 | struct gdb_osabi_sniffer | |
131 | { | |
132 | struct gdb_osabi_sniffer *next; | |
133 | enum bfd_architecture arch; /* bfd_arch_unknown == wildcard */ | |
134 | enum bfd_flavour flavour; | |
135 | enum gdb_osabi (*sniffer)(bfd *); | |
136 | }; | |
137 | ||
138 | static struct gdb_osabi_sniffer *gdb_osabi_sniffer_list; | |
139 | ||
140 | void | |
141 | gdbarch_register_osabi_sniffer (enum bfd_architecture arch, | |
142 | enum bfd_flavour flavour, | |
143 | enum gdb_osabi (*sniffer_fn)(bfd *)) | |
144 | { | |
145 | struct gdb_osabi_sniffer *sniffer; | |
146 | ||
147 | sniffer = | |
148 | (struct gdb_osabi_sniffer *) xmalloc (sizeof (struct gdb_osabi_sniffer)); | |
149 | sniffer->arch = arch; | |
150 | sniffer->flavour = flavour; | |
151 | sniffer->sniffer = sniffer_fn; | |
152 | ||
153 | sniffer->next = gdb_osabi_sniffer_list; | |
154 | gdb_osabi_sniffer_list = sniffer; | |
155 | } | |
156 | \f | |
157 | ||
158 | enum gdb_osabi | |
159 | gdbarch_lookup_osabi (bfd *abfd) | |
160 | { | |
161 | struct gdb_osabi_sniffer *sniffer; | |
162 | enum gdb_osabi osabi, match; | |
163 | int match_specific; | |
164 | ||
165 | match = GDB_OSABI_UNKNOWN; | |
166 | match_specific = 0; | |
167 | ||
168 | for (sniffer = gdb_osabi_sniffer_list; sniffer != NULL; | |
169 | sniffer = sniffer->next) | |
170 | { | |
171 | if ((sniffer->arch == bfd_arch_unknown /* wildcard */ | |
172 | || sniffer->arch == bfd_get_arch (abfd)) | |
173 | && sniffer->flavour == bfd_get_flavour (abfd)) | |
174 | { | |
175 | osabi = (*sniffer->sniffer) (abfd); | |
176 | if (osabi < GDB_OSABI_UNKNOWN || osabi >= GDB_OSABI_INVALID) | |
177 | { | |
178 | internal_error | |
179 | (__FILE__, __LINE__, | |
180 | "gdbarch_lookup_osabi: invalid OS ABI (%d) from sniffer " | |
181 | "for architecture %s flavour %d", | |
182 | (int) osabi, | |
183 | bfd_printable_arch_mach (bfd_get_arch (abfd), 0), | |
184 | (int) bfd_get_flavour (abfd)); | |
185 | } | |
186 | else if (osabi != GDB_OSABI_UNKNOWN) | |
187 | { | |
188 | /* A specific sniffer always overrides a generic sniffer. | |
189 | Croak on multiple match if the two matches are of the | |
190 | same class. If the user wishes to continue, we'll use | |
191 | the first match. */ | |
192 | if (match != GDB_OSABI_UNKNOWN) | |
193 | { | |
194 | if ((match_specific && sniffer->arch != bfd_arch_unknown) | |
195 | || (!match_specific && sniffer->arch == bfd_arch_unknown)) | |
196 | { | |
197 | internal_error | |
198 | (__FILE__, __LINE__, | |
199 | "gdbarch_lookup_osabi: multiple %sspecific OS ABI " | |
200 | "match for architecture %s flavour %d: first " | |
201 | "match \"%s\", second match \"%s\"", | |
202 | match_specific ? "" : "non-", | |
203 | bfd_printable_arch_mach (bfd_get_arch (abfd), 0), | |
204 | (int) bfd_get_flavour (abfd), | |
205 | gdbarch_osabi_name (match), | |
206 | gdbarch_osabi_name (osabi)); | |
207 | } | |
208 | else if (sniffer->arch != bfd_arch_unknown) | |
209 | { | |
210 | match = osabi; | |
211 | match_specific = 1; | |
212 | } | |
213 | } | |
214 | else | |
215 | { | |
216 | match = osabi; | |
217 | if (sniffer->arch != bfd_arch_unknown) | |
218 | match_specific = 1; | |
219 | } | |
220 | } | |
221 | } | |
222 | } | |
223 | ||
224 | return match; | |
225 | } | |
226 | ||
227 | void | |
228 | gdbarch_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch, | |
229 | enum gdb_osabi osabi) | |
230 | { | |
231 | struct gdb_osabi_handler *handler; | |
232 | bfd *abfd = info.abfd; | |
233 | const struct bfd_arch_info *arch_info = gdbarch_bfd_arch_info (gdbarch); | |
234 | ||
235 | if (osabi == GDB_OSABI_UNKNOWN) | |
236 | { | |
01fc4e33 AC |
237 | /* Don't complain about an unknown OSABI. Assume the user knows |
238 | what they are doing. */ | |
70f80edf JT |
239 | return; |
240 | } | |
241 | ||
242 | for (handler = gdb_osabi_handler_list; handler != NULL; | |
243 | handler = handler->next) | |
244 | { | |
245 | if (handler->arch == bfd_get_arch (abfd) | |
246 | && handler->osabi == osabi) | |
247 | { | |
248 | (*handler->init_osabi) (info, gdbarch); | |
249 | return; | |
250 | } | |
251 | } | |
252 | ||
253 | /* We assume that if GDB_MULTI_ARCH is less than GDB_MULTI_ARCH_TM | |
254 | that an ABI variant can be supported by overriding definitions in | |
255 | the tm-file. */ | |
256 | if (GDB_MULTI_ARCH > GDB_MULTI_ARCH_PARTIAL) | |
257 | fprintf_filtered | |
258 | (gdb_stderr, | |
259 | "A handler for the OS ABI \"%s\" is not built into this " | |
260 | "configuration of GDB. " | |
261 | "Attempting to continue with the default %s settings", | |
262 | gdbarch_osabi_name (osabi), | |
263 | bfd_printable_arch_mach (arch_info->arch, arch_info->mach)); | |
264 | } | |
265 | \f | |
266 | ||
267 | /* Generic sniffer for ELF flavoured files. */ | |
268 | ||
269 | void | |
270 | generic_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect, void *obj) | |
271 | { | |
272 | enum gdb_osabi *os_ident_ptr = obj; | |
273 | const char *name; | |
274 | unsigned int sectsize; | |
275 | ||
276 | name = bfd_get_section_name (abfd, sect); | |
277 | sectsize = bfd_section_size (abfd, sect); | |
278 | ||
279 | /* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */ | |
280 | if (strcmp (name, ".note.ABI-tag") == 0 && sectsize > 0) | |
281 | { | |
282 | unsigned int name_length, data_length, note_type; | |
283 | char *note; | |
284 | ||
285 | /* If the section is larger than this, it's probably not what we are | |
286 | looking for. */ | |
287 | if (sectsize > 128) | |
288 | sectsize = 128; | |
289 | ||
290 | note = alloca (sectsize); | |
291 | ||
292 | bfd_get_section_contents (abfd, sect, note, | |
293 | (file_ptr) 0, (bfd_size_type) sectsize); | |
294 | ||
295 | name_length = bfd_h_get_32 (abfd, note); | |
296 | data_length = bfd_h_get_32 (abfd, note + 4); | |
297 | note_type = bfd_h_get_32 (abfd, note + 8); | |
298 | ||
299 | if (name_length == 4 && data_length == 16 && note_type == NT_GNU_ABI_TAG | |
300 | && strcmp (note + 12, "GNU") == 0) | |
301 | { | |
302 | int os_number = bfd_h_get_32 (abfd, note + 16); | |
303 | ||
304 | switch (os_number) | |
305 | { | |
306 | case GNU_ABI_TAG_LINUX: | |
307 | *os_ident_ptr = GDB_OSABI_LINUX; | |
308 | break; | |
309 | ||
310 | case GNU_ABI_TAG_HURD: | |
311 | *os_ident_ptr = GDB_OSABI_HURD; | |
312 | break; | |
313 | ||
314 | case GNU_ABI_TAG_SOLARIS: | |
315 | *os_ident_ptr = GDB_OSABI_SOLARIS; | |
316 | break; | |
317 | ||
318 | default: | |
319 | internal_error | |
320 | (__FILE__, __LINE__, | |
321 | "generic_elf_osabi_sniff_abi_tag_sections: unknown OS number %d", | |
322 | os_number); | |
323 | } | |
324 | return; | |
325 | } | |
326 | else if (name_length == 8 && data_length == 4 | |
327 | && note_type == NT_FREEBSD_ABI_TAG | |
328 | && strcmp (note + 12, "FreeBSD") == 0) | |
329 | { | |
330 | /* XXX Should we check the version here? Probably not | |
331 | necessary yet. */ | |
332 | *os_ident_ptr = GDB_OSABI_FREEBSD_ELF; | |
333 | } | |
334 | return; | |
335 | } | |
336 | ||
337 | /* .note.netbsd.ident notes, used by NetBSD. */ | |
338 | if (strcmp (name, ".note.netbsd.ident") == 0 && sectsize > 0) | |
339 | { | |
340 | unsigned int name_length, data_length, note_type; | |
341 | char *note; | |
342 | ||
343 | /* If the section is larger than this, it's probably not what we are | |
344 | looking for. */ | |
345 | if (sectsize > 128) | |
346 | sectsize = 128; | |
347 | ||
348 | note = alloca (sectsize); | |
349 | ||
350 | bfd_get_section_contents (abfd, sect, note, | |
351 | (file_ptr) 0, (bfd_size_type) sectsize); | |
352 | ||
353 | name_length = bfd_h_get_32 (abfd, note); | |
354 | data_length = bfd_h_get_32 (abfd, note + 4); | |
355 | note_type = bfd_h_get_32 (abfd, note + 8); | |
356 | ||
357 | if (name_length == 7 && data_length == 4 && note_type == NT_NETBSD_IDENT | |
358 | && strcmp (note + 12, "NetBSD") == 0) | |
359 | { | |
360 | /* XXX Should we check the version here? Probably not | |
361 | necessary yet. */ | |
362 | *os_ident_ptr = GDB_OSABI_NETBSD_ELF; | |
363 | } | |
364 | return; | |
365 | } | |
366 | } | |
367 | ||
368 | static enum gdb_osabi | |
369 | generic_elf_osabi_sniffer (bfd *abfd) | |
370 | { | |
371 | unsigned int elfosabi; | |
372 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; | |
373 | ||
374 | elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; | |
375 | ||
376 | switch (elfosabi) | |
377 | { | |
378 | case ELFOSABI_NONE: | |
379 | /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the | |
380 | file are conforming to the base specification for that machine | |
381 | (there are no OS-specific extensions). In order to determine the | |
382 | real OS in use we must look for OS notes that have been added. */ | |
383 | bfd_map_over_sections (abfd, | |
384 | generic_elf_osabi_sniff_abi_tag_sections, | |
385 | &osabi); | |
386 | break; | |
387 | ||
388 | case ELFOSABI_FREEBSD: | |
389 | osabi = GDB_OSABI_FREEBSD_ELF; | |
390 | break; | |
391 | ||
392 | case ELFOSABI_NETBSD: | |
393 | osabi = GDB_OSABI_NETBSD_ELF; | |
394 | break; | |
395 | ||
396 | case ELFOSABI_LINUX: | |
397 | osabi = GDB_OSABI_LINUX; | |
398 | break; | |
399 | ||
400 | case ELFOSABI_HURD: | |
401 | osabi = GDB_OSABI_HURD; | |
402 | break; | |
403 | ||
404 | case ELFOSABI_SOLARIS: | |
405 | osabi = GDB_OSABI_SOLARIS; | |
406 | break; | |
407 | } | |
408 | ||
bb21884d MK |
409 | if (osabi == GDB_OSABI_UNKNOWN) |
410 | { | |
411 | /* The FreeBSD folks have been naughty; they stored the string | |
412 | "FreeBSD" in the padding of the e_ident field of the ELF | |
413 | header to "brand" their ELF binaries in FreeBSD 3.x. */ | |
414 | if (strcmp (&elf_elfheader (abfd)->e_ident[8], "FreeBSD") == 0) | |
415 | osabi = GDB_OSABI_FREEBSD_ELF; | |
416 | } | |
417 | ||
70f80edf JT |
418 | return osabi; |
419 | } | |
420 | \f | |
421 | ||
422 | void | |
423 | _initialize_gdb_osabi (void) | |
424 | { | |
425 | if (strcmp (gdb_osabi_names[GDB_OSABI_INVALID], "<invalid>") != 0) | |
426 | internal_error | |
427 | (__FILE__, __LINE__, | |
428 | "_initialize_gdb_osabi: gdb_osabi_names[] is inconsistent"); | |
429 | ||
430 | /* Register a generic sniffer for ELF flavoured files. */ | |
431 | gdbarch_register_osabi_sniffer (bfd_arch_unknown, | |
432 | bfd_target_elf_flavour, | |
433 | generic_elf_osabi_sniffer); | |
434 | } |