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