Commit | Line | Data |
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c906108c | 1 | /* GDB routines for manipulating the minimal symbol tables. |
ecd75fc8 | 2 | Copyright (C) 1992-2014 Free Software Foundation, Inc. |
c906108c SS |
3 | Contributed by Cygnus Support, using pieces from other GDB modules. |
4 | ||
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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 |
c5aa993b | 10 | (at your option) any later version. |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b | 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/>. */ |
c906108c SS |
19 | |
20 | ||
21 | /* This file contains support routines for creating, manipulating, and | |
22 | destroying minimal symbol tables. | |
23 | ||
24 | Minimal symbol tables are used to hold some very basic information about | |
25 | all defined global symbols (text, data, bss, abs, etc). The only two | |
26 | required pieces of information are the symbol's name and the address | |
27 | associated with that symbol. | |
28 | ||
29 | In many cases, even if a file was compiled with no special options for | |
30 | debugging at all, as long as was not stripped it will contain sufficient | |
31 | information to build useful minimal symbol tables using this structure. | |
c5aa993b | 32 | |
c906108c SS |
33 | Even when a file contains enough debugging information to build a full |
34 | symbol table, these minimal symbols are still useful for quickly mapping | |
35 | between names and addresses, and vice versa. They are also sometimes used | |
025bb325 | 36 | to figure out what full symbol table entries need to be read in. */ |
c906108c SS |
37 | |
38 | ||
39 | #include "defs.h" | |
9227b5eb | 40 | #include <ctype.h> |
0e9f083f | 41 | #include <string.h> |
c906108c SS |
42 | #include "symtab.h" |
43 | #include "bfd.h" | |
0ba1096a | 44 | #include "filenames.h" |
c906108c SS |
45 | #include "symfile.h" |
46 | #include "objfiles.h" | |
47 | #include "demangle.h" | |
7ed49443 JB |
48 | #include "value.h" |
49 | #include "cp-abi.h" | |
42848c96 | 50 | #include "target.h" |
71c25dea TT |
51 | #include "cp-support.h" |
52 | #include "language.h" | |
529480d0 | 53 | #include "cli/cli-utils.h" |
c906108c SS |
54 | |
55 | /* Accumulate the minimal symbols for each objfile in bunches of BUNCH_SIZE. | |
56 | At the end, copy them all into one newly allocated location on an objfile's | |
34643a32 | 57 | per-BFD storage obstack. */ |
c906108c SS |
58 | |
59 | #define BUNCH_SIZE 127 | |
60 | ||
61 | struct msym_bunch | |
c5aa993b JM |
62 | { |
63 | struct msym_bunch *next; | |
64 | struct minimal_symbol contents[BUNCH_SIZE]; | |
65 | }; | |
c906108c SS |
66 | |
67 | /* Bunch currently being filled up. | |
68 | The next field points to chain of filled bunches. */ | |
69 | ||
70 | static struct msym_bunch *msym_bunch; | |
71 | ||
72 | /* Number of slots filled in current bunch. */ | |
73 | ||
74 | static int msym_bunch_index; | |
75 | ||
76 | /* Total number of minimal symbols recorded so far for the objfile. */ | |
77 | ||
78 | static int msym_count; | |
79 | ||
b19686e0 | 80 | /* See minsyms.h. */ |
9227b5eb JB |
81 | |
82 | unsigned int | |
83 | msymbol_hash_iw (const char *string) | |
84 | { | |
85 | unsigned int hash = 0; | |
b8d56208 | 86 | |
9227b5eb JB |
87 | while (*string && *string != '(') |
88 | { | |
529480d0 | 89 | string = skip_spaces_const (string); |
9227b5eb | 90 | if (*string && *string != '(') |
375f3d86 | 91 | { |
59d7bcaf | 92 | hash = SYMBOL_HASH_NEXT (hash, *string); |
375f3d86 DJ |
93 | ++string; |
94 | } | |
9227b5eb | 95 | } |
261397f8 | 96 | return hash; |
9227b5eb JB |
97 | } |
98 | ||
b19686e0 | 99 | /* See minsyms.h. */ |
9227b5eb JB |
100 | |
101 | unsigned int | |
102 | msymbol_hash (const char *string) | |
103 | { | |
104 | unsigned int hash = 0; | |
b8d56208 | 105 | |
9227b5eb | 106 | for (; *string; ++string) |
59d7bcaf | 107 | hash = SYMBOL_HASH_NEXT (hash, *string); |
261397f8 | 108 | return hash; |
9227b5eb JB |
109 | } |
110 | ||
111 | /* Add the minimal symbol SYM to an objfile's minsym hash table, TABLE. */ | |
984ac464 | 112 | static void |
9227b5eb JB |
113 | add_minsym_to_hash_table (struct minimal_symbol *sym, |
114 | struct minimal_symbol **table) | |
115 | { | |
116 | if (sym->hash_next == NULL) | |
117 | { | |
f56f77c1 | 118 | unsigned int hash |
efd66ac6 | 119 | = msymbol_hash (MSYMBOL_LINKAGE_NAME (sym)) % MINIMAL_SYMBOL_HASH_SIZE; |
b8d56208 | 120 | |
9227b5eb JB |
121 | sym->hash_next = table[hash]; |
122 | table[hash] = sym; | |
123 | } | |
124 | } | |
125 | ||
0729fd50 DB |
126 | /* Add the minimal symbol SYM to an objfile's minsym demangled hash table, |
127 | TABLE. */ | |
128 | static void | |
129 | add_minsym_to_demangled_hash_table (struct minimal_symbol *sym, | |
130 | struct minimal_symbol **table) | |
131 | { | |
132 | if (sym->demangled_hash_next == NULL) | |
133 | { | |
efd66ac6 | 134 | unsigned int hash = msymbol_hash_iw (MSYMBOL_SEARCH_NAME (sym)) |
3e43a32a | 135 | % MINIMAL_SYMBOL_HASH_SIZE; |
b8d56208 | 136 | |
0729fd50 DB |
137 | sym->demangled_hash_next = table[hash]; |
138 | table[hash] = sym; | |
139 | } | |
140 | } | |
141 | ||
c906108c SS |
142 | /* Look through all the current minimal symbol tables and find the |
143 | first minimal symbol that matches NAME. If OBJF is non-NULL, limit | |
72a5efb3 DJ |
144 | the search to that objfile. If SFILE is non-NULL, the only file-scope |
145 | symbols considered will be from that source file (global symbols are | |
146 | still preferred). Returns a pointer to the minimal symbol that | |
c906108c SS |
147 | matches, or NULL if no match is found. |
148 | ||
149 | Note: One instance where there may be duplicate minimal symbols with | |
150 | the same name is when the symbol tables for a shared library and the | |
151 | symbol tables for an executable contain global symbols with the same | |
d73f140a JB |
152 | names (the dynamic linker deals with the duplication). |
153 | ||
154 | It's also possible to have minimal symbols with different mangled | |
155 | names, but identical demangled names. For example, the GNU C++ v3 | |
156 | ABI requires the generation of two (or perhaps three) copies of | |
157 | constructor functions --- "in-charge", "not-in-charge", and | |
158 | "allocate" copies; destructors may be duplicated as well. | |
159 | Obviously, there must be distinct mangled names for each of these, | |
160 | but the demangled names are all the same: S::S or S::~S. */ | |
c906108c | 161 | |
3b7344d5 TT |
162 | struct bound_minimal_symbol |
163 | lookup_minimal_symbol (const char *name, const char *sfile, | |
164 | struct objfile *objf) | |
c906108c SS |
165 | { |
166 | struct objfile *objfile; | |
7c7b6655 TT |
167 | struct bound_minimal_symbol found_symbol = { NULL, NULL }; |
168 | struct bound_minimal_symbol found_file_symbol = { NULL, NULL }; | |
169 | struct bound_minimal_symbol trampoline_symbol = { NULL, NULL }; | |
c906108c | 170 | |
261397f8 DJ |
171 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
172 | unsigned int dem_hash = msymbol_hash_iw (name) % MINIMAL_SYMBOL_HASH_SIZE; | |
9227b5eb | 173 | |
71c25dea TT |
174 | int needtofreename = 0; |
175 | const char *modified_name; | |
176 | ||
c906108c | 177 | if (sfile != NULL) |
9f37bbcc | 178 | sfile = lbasename (sfile); |
c906108c | 179 | |
025bb325 | 180 | /* For C++, canonicalize the input name. */ |
71c25dea TT |
181 | modified_name = name; |
182 | if (current_language->la_language == language_cplus) | |
183 | { | |
184 | char *cname = cp_canonicalize_string (name); | |
b8d56208 | 185 | |
71c25dea TT |
186 | if (cname) |
187 | { | |
188 | modified_name = cname; | |
189 | needtofreename = 1; | |
190 | } | |
191 | } | |
192 | ||
c906108c | 193 | for (objfile = object_files; |
7c7b6655 | 194 | objfile != NULL && found_symbol.minsym == NULL; |
c5aa993b | 195 | objfile = objfile->next) |
c906108c | 196 | { |
7c7b6655 TT |
197 | struct minimal_symbol *msymbol; |
198 | ||
56e3f43c | 199 | if (objf == NULL || objf == objfile |
15d123c9 | 200 | || objf == objfile->separate_debug_objfile_backlink) |
c906108c | 201 | { |
9227b5eb JB |
202 | /* Do two passes: the first over the ordinary hash table, |
203 | and the second over the demangled hash table. */ | |
0729fd50 | 204 | int pass; |
9227b5eb | 205 | |
7c7b6655 | 206 | for (pass = 1; pass <= 2 && found_symbol.minsym == NULL; pass++) |
c906108c | 207 | { |
0729fd50 DB |
208 | /* Select hash list according to pass. */ |
209 | if (pass == 1) | |
34643a32 | 210 | msymbol = objfile->per_bfd->msymbol_hash[hash]; |
0729fd50 | 211 | else |
34643a32 | 212 | msymbol = objfile->per_bfd->msymbol_demangled_hash[dem_hash]; |
0729fd50 | 213 | |
7c7b6655 | 214 | while (msymbol != NULL && found_symbol.minsym == NULL) |
c906108c | 215 | { |
3567439c DJ |
216 | int match; |
217 | ||
218 | if (pass == 1) | |
71c25dea | 219 | { |
559a7a62 JK |
220 | int (*cmp) (const char *, const char *); |
221 | ||
222 | cmp = (case_sensitivity == case_sensitive_on | |
223 | ? strcmp : strcasecmp); | |
efd66ac6 | 224 | match = cmp (MSYMBOL_LINKAGE_NAME (msymbol), |
559a7a62 | 225 | modified_name) == 0; |
71c25dea | 226 | } |
3567439c | 227 | else |
71c25dea | 228 | { |
559a7a62 | 229 | /* The function respects CASE_SENSITIVITY. */ |
efd66ac6 | 230 | match = MSYMBOL_MATCHES_SEARCH_NAME (msymbol, |
71c25dea TT |
231 | modified_name); |
232 | } | |
233 | ||
3567439c | 234 | if (match) |
c906108c | 235 | { |
0729fd50 DB |
236 | switch (MSYMBOL_TYPE (msymbol)) |
237 | { | |
238 | case mst_file_text: | |
239 | case mst_file_data: | |
240 | case mst_file_bss: | |
6314a349 | 241 | if (sfile == NULL |
0ba1096a | 242 | || filename_cmp (msymbol->filename, sfile) == 0) |
7c7b6655 TT |
243 | { |
244 | found_file_symbol.minsym = msymbol; | |
245 | found_file_symbol.objfile = objfile; | |
246 | } | |
0729fd50 DB |
247 | break; |
248 | ||
249 | case mst_solib_trampoline: | |
250 | ||
251 | /* If a trampoline symbol is found, we prefer to | |
025bb325 | 252 | keep looking for the *real* symbol. If the |
0729fd50 | 253 | actual symbol is not found, then we'll use the |
025bb325 | 254 | trampoline entry. */ |
7c7b6655 TT |
255 | if (trampoline_symbol.minsym == NULL) |
256 | { | |
257 | trampoline_symbol.minsym = msymbol; | |
258 | trampoline_symbol.objfile = objfile; | |
259 | } | |
0729fd50 DB |
260 | break; |
261 | ||
262 | case mst_unknown: | |
263 | default: | |
7c7b6655 TT |
264 | found_symbol.minsym = msymbol; |
265 | found_symbol.objfile = objfile; | |
0729fd50 DB |
266 | break; |
267 | } | |
c906108c | 268 | } |
9227b5eb | 269 | |
0729fd50 DB |
270 | /* Find the next symbol on the hash chain. */ |
271 | if (pass == 1) | |
272 | msymbol = msymbol->hash_next; | |
273 | else | |
274 | msymbol = msymbol->demangled_hash_next; | |
9227b5eb | 275 | } |
c906108c SS |
276 | } |
277 | } | |
278 | } | |
71c25dea TT |
279 | |
280 | if (needtofreename) | |
281 | xfree ((void *) modified_name); | |
282 | ||
c906108c | 283 | /* External symbols are best. */ |
7c7b6655 | 284 | if (found_symbol.minsym != NULL) |
c906108c SS |
285 | return found_symbol; |
286 | ||
287 | /* File-local symbols are next best. */ | |
7c7b6655 | 288 | if (found_file_symbol.minsym != NULL) |
c906108c SS |
289 | return found_file_symbol; |
290 | ||
291 | /* Symbols for shared library trampolines are next best. */ | |
7c7b6655 TT |
292 | return trampoline_symbol; |
293 | } | |
294 | ||
295 | /* See minsyms.h. */ | |
c906108c | 296 | |
7c7b6655 TT |
297 | struct bound_minimal_symbol |
298 | lookup_bound_minimal_symbol (const char *name) | |
299 | { | |
3b7344d5 | 300 | return lookup_minimal_symbol (name, NULL, NULL); |
c906108c SS |
301 | } |
302 | ||
b19686e0 | 303 | /* See minsyms.h. */ |
f8eba3c6 TT |
304 | |
305 | void | |
306 | iterate_over_minimal_symbols (struct objfile *objf, const char *name, | |
307 | void (*callback) (struct minimal_symbol *, | |
308 | void *), | |
309 | void *user_data) | |
310 | { | |
311 | unsigned int hash; | |
312 | struct minimal_symbol *iter; | |
313 | int (*cmp) (const char *, const char *); | |
314 | ||
315 | /* The first pass is over the ordinary hash table. */ | |
316 | hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; | |
34643a32 | 317 | iter = objf->per_bfd->msymbol_hash[hash]; |
f8eba3c6 TT |
318 | cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp); |
319 | while (iter) | |
320 | { | |
efd66ac6 | 321 | if (cmp (MSYMBOL_LINKAGE_NAME (iter), name) == 0) |
f8eba3c6 TT |
322 | (*callback) (iter, user_data); |
323 | iter = iter->hash_next; | |
324 | } | |
325 | ||
326 | /* The second pass is over the demangled table. */ | |
327 | hash = msymbol_hash_iw (name) % MINIMAL_SYMBOL_HASH_SIZE; | |
34643a32 | 328 | iter = objf->per_bfd->msymbol_demangled_hash[hash]; |
f8eba3c6 TT |
329 | while (iter) |
330 | { | |
efd66ac6 | 331 | if (MSYMBOL_MATCHES_SEARCH_NAME (iter, name)) |
f8eba3c6 TT |
332 | (*callback) (iter, user_data); |
333 | iter = iter->demangled_hash_next; | |
334 | } | |
335 | } | |
336 | ||
b19686e0 | 337 | /* See minsyms.h. */ |
c5aa993b | 338 | |
3b7344d5 | 339 | struct bound_minimal_symbol |
5520a790 | 340 | lookup_minimal_symbol_text (const char *name, struct objfile *objf) |
c906108c SS |
341 | { |
342 | struct objfile *objfile; | |
343 | struct minimal_symbol *msymbol; | |
3b7344d5 TT |
344 | struct bound_minimal_symbol found_symbol = { NULL, NULL }; |
345 | struct bound_minimal_symbol found_file_symbol = { NULL, NULL }; | |
c906108c | 346 | |
72a5efb3 DJ |
347 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
348 | ||
c906108c | 349 | for (objfile = object_files; |
3b7344d5 | 350 | objfile != NULL && found_symbol.minsym == NULL; |
c5aa993b | 351 | objfile = objfile->next) |
c906108c | 352 | { |
56e3f43c | 353 | if (objf == NULL || objf == objfile |
15d123c9 | 354 | || objf == objfile->separate_debug_objfile_backlink) |
c906108c | 355 | { |
34643a32 | 356 | for (msymbol = objfile->per_bfd->msymbol_hash[hash]; |
3b7344d5 | 357 | msymbol != NULL && found_symbol.minsym == NULL; |
72a5efb3 | 358 | msymbol = msymbol->hash_next) |
c906108c | 359 | { |
efd66ac6 | 360 | if (strcmp (MSYMBOL_LINKAGE_NAME (msymbol), name) == 0 && |
0875794a JK |
361 | (MSYMBOL_TYPE (msymbol) == mst_text |
362 | || MSYMBOL_TYPE (msymbol) == mst_text_gnu_ifunc | |
363 | || MSYMBOL_TYPE (msymbol) == mst_file_text)) | |
c906108c SS |
364 | { |
365 | switch (MSYMBOL_TYPE (msymbol)) | |
366 | { | |
367 | case mst_file_text: | |
3b7344d5 TT |
368 | found_file_symbol.minsym = msymbol; |
369 | found_file_symbol.objfile = objfile; | |
c906108c SS |
370 | break; |
371 | default: | |
3b7344d5 TT |
372 | found_symbol.minsym = msymbol; |
373 | found_symbol.objfile = objfile; | |
c906108c SS |
374 | break; |
375 | } | |
376 | } | |
377 | } | |
378 | } | |
379 | } | |
380 | /* External symbols are best. */ | |
3b7344d5 | 381 | if (found_symbol.minsym) |
c906108c SS |
382 | return found_symbol; |
383 | ||
384 | /* File-local symbols are next best. */ | |
3b7344d5 | 385 | return found_file_symbol; |
c906108c SS |
386 | } |
387 | ||
b19686e0 | 388 | /* See minsyms.h. */ |
907fc202 UW |
389 | |
390 | struct minimal_symbol * | |
391 | lookup_minimal_symbol_by_pc_name (CORE_ADDR pc, const char *name, | |
392 | struct objfile *objf) | |
393 | { | |
394 | struct objfile *objfile; | |
395 | struct minimal_symbol *msymbol; | |
396 | ||
397 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; | |
398 | ||
399 | for (objfile = object_files; | |
400 | objfile != NULL; | |
401 | objfile = objfile->next) | |
402 | { | |
403 | if (objf == NULL || objf == objfile | |
15d123c9 | 404 | || objf == objfile->separate_debug_objfile_backlink) |
907fc202 | 405 | { |
34643a32 | 406 | for (msymbol = objfile->per_bfd->msymbol_hash[hash]; |
907fc202 UW |
407 | msymbol != NULL; |
408 | msymbol = msymbol->hash_next) | |
409 | { | |
77e371c0 | 410 | if (MSYMBOL_VALUE_ADDRESS (objfile, msymbol) == pc |
efd66ac6 | 411 | && strcmp (MSYMBOL_LINKAGE_NAME (msymbol), name) == 0) |
907fc202 UW |
412 | return msymbol; |
413 | } | |
414 | } | |
415 | } | |
416 | ||
417 | return NULL; | |
418 | } | |
419 | ||
b19686e0 | 420 | /* See minsyms.h. */ |
c5aa993b | 421 | |
3b7344d5 | 422 | struct bound_minimal_symbol |
aa1ee363 | 423 | lookup_minimal_symbol_solib_trampoline (const char *name, |
aa1ee363 | 424 | struct objfile *objf) |
c906108c SS |
425 | { |
426 | struct objfile *objfile; | |
427 | struct minimal_symbol *msymbol; | |
3b7344d5 | 428 | struct bound_minimal_symbol found_symbol = { NULL, NULL }; |
c906108c | 429 | |
72a5efb3 DJ |
430 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
431 | ||
c906108c | 432 | for (objfile = object_files; |
3b7344d5 | 433 | objfile != NULL; |
c5aa993b | 434 | objfile = objfile->next) |
c906108c | 435 | { |
56e3f43c | 436 | if (objf == NULL || objf == objfile |
15d123c9 | 437 | || objf == objfile->separate_debug_objfile_backlink) |
c906108c | 438 | { |
34643a32 | 439 | for (msymbol = objfile->per_bfd->msymbol_hash[hash]; |
3b7344d5 | 440 | msymbol != NULL; |
72a5efb3 | 441 | msymbol = msymbol->hash_next) |
c906108c | 442 | { |
efd66ac6 | 443 | if (strcmp (MSYMBOL_LINKAGE_NAME (msymbol), name) == 0 && |
c906108c | 444 | MSYMBOL_TYPE (msymbol) == mst_solib_trampoline) |
3b7344d5 TT |
445 | { |
446 | found_symbol.objfile = objfile; | |
447 | found_symbol.minsym = msymbol; | |
448 | return found_symbol; | |
449 | } | |
c906108c SS |
450 | } |
451 | } | |
452 | } | |
453 | ||
3b7344d5 | 454 | return found_symbol; |
c906108c SS |
455 | } |
456 | ||
77e371c0 TT |
457 | /* A helper function that makes *PC section-relative. This searches |
458 | the sections of OBJFILE and if *PC is in a section, it subtracts | |
459 | the section offset and returns true. Otherwise it returns | |
460 | false. */ | |
461 | ||
462 | static int | |
463 | frob_address (struct objfile *objfile, CORE_ADDR *pc) | |
464 | { | |
465 | struct obj_section *iter; | |
466 | ||
467 | ALL_OBJFILE_OSECTIONS (objfile, iter) | |
468 | { | |
469 | if (*pc >= obj_section_addr (iter) && *pc < obj_section_endaddr (iter)) | |
470 | { | |
471 | *pc -= obj_section_offset (iter); | |
472 | return 1; | |
473 | } | |
474 | } | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
c906108c SS |
479 | /* Search through the minimal symbol table for each objfile and find |
480 | the symbol whose address is the largest address that is still less | |
00878c6e PP |
481 | than or equal to PC, and matches SECTION (which is not NULL). |
482 | Returns a pointer to the minimal symbol if such a symbol is found, | |
483 | or NULL if PC is not in a suitable range. | |
484 | Note that we need to look through ALL the minimal symbol tables | |
485 | before deciding on the symbol that comes closest to the specified PC. | |
486 | This is because objfiles can overlap, for example objfile A has .text | |
487 | at 0x100 and .data at 0x40000 and objfile B has .text at 0x234 and | |
488 | .data at 0x40048. | |
c906108c | 489 | |
2eaf8d2a DJ |
490 | If WANT_TRAMPOLINE is set, prefer mst_solib_trampoline symbols when |
491 | there are text and trampoline symbols at the same address. | |
492 | Otherwise prefer mst_text symbols. */ | |
493 | ||
7cbd4a93 | 494 | static struct bound_minimal_symbol |
77e371c0 | 495 | lookup_minimal_symbol_by_pc_section_1 (CORE_ADDR pc_in, |
714835d5 | 496 | struct obj_section *section, |
2eaf8d2a | 497 | int want_trampoline) |
c906108c SS |
498 | { |
499 | int lo; | |
500 | int hi; | |
501 | int new; | |
502 | struct objfile *objfile; | |
503 | struct minimal_symbol *msymbol; | |
504 | struct minimal_symbol *best_symbol = NULL; | |
7cbd4a93 TT |
505 | struct objfile *best_objfile = NULL; |
506 | struct bound_minimal_symbol result; | |
2eaf8d2a | 507 | enum minimal_symbol_type want_type, other_type; |
c906108c | 508 | |
2eaf8d2a DJ |
509 | want_type = want_trampoline ? mst_solib_trampoline : mst_text; |
510 | other_type = want_trampoline ? mst_text : mst_solib_trampoline; | |
00878c6e PP |
511 | |
512 | /* We can not require the symbol found to be in section, because | |
96225718 DJ |
513 | e.g. IRIX 6.5 mdebug relies on this code returning an absolute |
514 | symbol - but find_pc_section won't return an absolute section and | |
515 | hence the code below would skip over absolute symbols. We can | |
516 | still take advantage of the call to find_pc_section, though - the | |
517 | object file still must match. In case we have separate debug | |
518 | files, search both the file and its separate debug file. There's | |
519 | no telling which one will have the minimal symbols. */ | |
520 | ||
00878c6e | 521 | gdb_assert (section != NULL); |
96225718 | 522 | |
15d123c9 TG |
523 | for (objfile = section->objfile; |
524 | objfile != NULL; | |
525 | objfile = objfile_separate_debug_iterate (section->objfile, objfile)) | |
c906108c | 526 | { |
77e371c0 TT |
527 | CORE_ADDR pc = pc_in; |
528 | ||
c906108c | 529 | /* If this objfile has a minimal symbol table, go search it using |
c5aa993b JM |
530 | a binary search. Note that a minimal symbol table always consists |
531 | of at least two symbols, a "real" symbol and the terminating | |
532 | "null symbol". If there are no real symbols, then there is no | |
025bb325 | 533 | minimal symbol table at all. */ |
c906108c | 534 | |
34643a32 | 535 | if (objfile->per_bfd->minimal_symbol_count > 0) |
c906108c | 536 | { |
29e8a844 DJ |
537 | int best_zero_sized = -1; |
538 | ||
34643a32 | 539 | msymbol = objfile->per_bfd->msymbols; |
c906108c | 540 | lo = 0; |
34643a32 | 541 | hi = objfile->per_bfd->minimal_symbol_count - 1; |
c906108c SS |
542 | |
543 | /* This code assumes that the minimal symbols are sorted by | |
544 | ascending address values. If the pc value is greater than or | |
545 | equal to the first symbol's address, then some symbol in this | |
546 | minimal symbol table is a suitable candidate for being the | |
547 | "best" symbol. This includes the last real symbol, for cases | |
548 | where the pc value is larger than any address in this vector. | |
549 | ||
550 | By iterating until the address associated with the current | |
551 | hi index (the endpoint of the test interval) is less than | |
552 | or equal to the desired pc value, we accomplish two things: | |
553 | (1) the case where the pc value is larger than any minimal | |
554 | symbol address is trivially solved, (2) the address associated | |
555 | with the hi index is always the one we want when the interation | |
556 | terminates. In essence, we are iterating the test interval | |
557 | down until the pc value is pushed out of it from the high end. | |
558 | ||
025bb325 | 559 | Warning: this code is trickier than it would appear at first. */ |
c906108c | 560 | |
77e371c0 TT |
561 | if (frob_address (objfile, &pc) |
562 | && pc >= MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[lo])) | |
c906108c | 563 | { |
77e371c0 | 564 | while (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi]) > pc) |
c906108c | 565 | { |
025bb325 MS |
566 | /* pc is still strictly less than highest address. */ |
567 | /* Note "new" will always be >= lo. */ | |
c906108c | 568 | new = (lo + hi) / 2; |
77e371c0 TT |
569 | if ((MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[new]) >= pc) |
570 | || (lo == new)) | |
c906108c SS |
571 | { |
572 | hi = new; | |
573 | } | |
574 | else | |
575 | { | |
576 | lo = new; | |
577 | } | |
578 | } | |
579 | ||
580 | /* If we have multiple symbols at the same address, we want | |
c5aa993b JM |
581 | hi to point to the last one. That way we can find the |
582 | right symbol if it has an index greater than hi. */ | |
34643a32 | 583 | while (hi < objfile->per_bfd->minimal_symbol_count - 1 |
77e371c0 TT |
584 | && (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi]) |
585 | == MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi + 1]))) | |
c906108c SS |
586 | hi++; |
587 | ||
29e8a844 DJ |
588 | /* Skip various undesirable symbols. */ |
589 | while (hi >= 0) | |
590 | { | |
591 | /* Skip any absolute symbols. This is apparently | |
592 | what adb and dbx do, and is needed for the CM-5. | |
593 | There are two known possible problems: (1) on | |
594 | ELF, apparently end, edata, etc. are absolute. | |
595 | Not sure ignoring them here is a big deal, but if | |
596 | we want to use them, the fix would go in | |
597 | elfread.c. (2) I think shared library entry | |
598 | points on the NeXT are absolute. If we want | |
599 | special handling for this it probably should be | |
600 | triggered by a special mst_abs_or_lib or some | |
601 | such. */ | |
602 | ||
712f90be | 603 | if (MSYMBOL_TYPE (&msymbol[hi]) == mst_abs) |
29e8a844 DJ |
604 | { |
605 | hi--; | |
606 | continue; | |
607 | } | |
608 | ||
609 | /* If SECTION was specified, skip any symbol from | |
610 | wrong section. */ | |
611 | if (section | |
612 | /* Some types of debug info, such as COFF, | |
613 | don't fill the bfd_section member, so don't | |
614 | throw away symbols on those platforms. */ | |
efd66ac6 | 615 | && MSYMBOL_OBJ_SECTION (objfile, &msymbol[hi]) != NULL |
714835d5 | 616 | && (!matching_obj_sections |
efd66ac6 | 617 | (MSYMBOL_OBJ_SECTION (objfile, &msymbol[hi]), |
e27d198c | 618 | section))) |
29e8a844 DJ |
619 | { |
620 | hi--; | |
621 | continue; | |
622 | } | |
623 | ||
2eaf8d2a DJ |
624 | /* If we are looking for a trampoline and this is a |
625 | text symbol, or the other way around, check the | |
177b42fe | 626 | preceding symbol too. If they are otherwise |
2eaf8d2a DJ |
627 | identical prefer that one. */ |
628 | if (hi > 0 | |
629 | && MSYMBOL_TYPE (&msymbol[hi]) == other_type | |
630 | && MSYMBOL_TYPE (&msymbol[hi - 1]) == want_type | |
631 | && (MSYMBOL_SIZE (&msymbol[hi]) | |
632 | == MSYMBOL_SIZE (&msymbol[hi - 1])) | |
77e371c0 TT |
633 | && (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi]) |
634 | == MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi - 1])) | |
efd66ac6 TT |
635 | && (MSYMBOL_OBJ_SECTION (objfile, &msymbol[hi]) |
636 | == MSYMBOL_OBJ_SECTION (objfile, &msymbol[hi - 1]))) | |
2eaf8d2a DJ |
637 | { |
638 | hi--; | |
639 | continue; | |
640 | } | |
641 | ||
29e8a844 DJ |
642 | /* If the minimal symbol has a zero size, save it |
643 | but keep scanning backwards looking for one with | |
644 | a non-zero size. A zero size may mean that the | |
645 | symbol isn't an object or function (e.g. a | |
646 | label), or it may just mean that the size was not | |
647 | specified. */ | |
648 | if (MSYMBOL_SIZE (&msymbol[hi]) == 0 | |
649 | && best_zero_sized == -1) | |
650 | { | |
651 | best_zero_sized = hi; | |
652 | hi--; | |
653 | continue; | |
654 | } | |
655 | ||
f7a6bb70 DJ |
656 | /* If we are past the end of the current symbol, try |
657 | the previous symbol if it has a larger overlapping | |
658 | size. This happens on i686-pc-linux-gnu with glibc; | |
659 | the nocancel variants of system calls are inside | |
660 | the cancellable variants, but both have sizes. */ | |
661 | if (hi > 0 | |
662 | && MSYMBOL_SIZE (&msymbol[hi]) != 0 | |
77e371c0 | 663 | && pc >= (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi]) |
f7a6bb70 | 664 | + MSYMBOL_SIZE (&msymbol[hi])) |
77e371c0 | 665 | && pc < (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi - 1]) |
f7a6bb70 DJ |
666 | + MSYMBOL_SIZE (&msymbol[hi - 1]))) |
667 | { | |
668 | hi--; | |
669 | continue; | |
670 | } | |
671 | ||
29e8a844 DJ |
672 | /* Otherwise, this symbol must be as good as we're going |
673 | to get. */ | |
674 | break; | |
675 | } | |
676 | ||
677 | /* If HI has a zero size, and best_zero_sized is set, | |
678 | then we had two or more zero-sized symbols; prefer | |
679 | the first one we found (which may have a higher | |
680 | address). Also, if we ran off the end, be sure | |
681 | to back up. */ | |
682 | if (best_zero_sized != -1 | |
683 | && (hi < 0 || MSYMBOL_SIZE (&msymbol[hi]) == 0)) | |
684 | hi = best_zero_sized; | |
685 | ||
686 | /* If the minimal symbol has a non-zero size, and this | |
687 | PC appears to be outside the symbol's contents, then | |
688 | refuse to use this symbol. If we found a zero-sized | |
689 | symbol with an address greater than this symbol's, | |
690 | use that instead. We assume that if symbols have | |
691 | specified sizes, they do not overlap. */ | |
692 | ||
693 | if (hi >= 0 | |
694 | && MSYMBOL_SIZE (&msymbol[hi]) != 0 | |
77e371c0 | 695 | && pc >= (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi]) |
29e8a844 DJ |
696 | + MSYMBOL_SIZE (&msymbol[hi]))) |
697 | { | |
698 | if (best_zero_sized != -1) | |
699 | hi = best_zero_sized; | |
700 | else | |
701 | /* Go on to the next object file. */ | |
702 | continue; | |
703 | } | |
704 | ||
c906108c | 705 | /* The minimal symbol indexed by hi now is the best one in this |
c5aa993b | 706 | objfile's minimal symbol table. See if it is the best one |
025bb325 | 707 | overall. */ |
c906108c | 708 | |
c906108c SS |
709 | if (hi >= 0 |
710 | && ((best_symbol == NULL) || | |
77e371c0 TT |
711 | (MSYMBOL_VALUE_RAW_ADDRESS (best_symbol) < |
712 | MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi])))) | |
c906108c SS |
713 | { |
714 | best_symbol = &msymbol[hi]; | |
7cbd4a93 | 715 | best_objfile = objfile; |
c906108c SS |
716 | } |
717 | } | |
718 | } | |
719 | } | |
7cbd4a93 TT |
720 | |
721 | result.minsym = best_symbol; | |
722 | result.objfile = best_objfile; | |
723 | return result; | |
c906108c SS |
724 | } |
725 | ||
7cbd4a93 | 726 | struct bound_minimal_symbol |
714835d5 | 727 | lookup_minimal_symbol_by_pc_section (CORE_ADDR pc, struct obj_section *section) |
2eaf8d2a | 728 | { |
00878c6e PP |
729 | if (section == NULL) |
730 | { | |
731 | /* NOTE: cagney/2004-01-27: This was using find_pc_mapped_section to | |
732 | force the section but that (well unless you're doing overlay | |
733 | debugging) always returns NULL making the call somewhat useless. */ | |
734 | section = find_pc_section (pc); | |
735 | if (section == NULL) | |
7cbd4a93 TT |
736 | { |
737 | struct bound_minimal_symbol result; | |
738 | ||
739 | memset (&result, 0, sizeof (result)); | |
740 | return result; | |
741 | } | |
00878c6e | 742 | } |
2eaf8d2a DJ |
743 | return lookup_minimal_symbol_by_pc_section_1 (pc, section, 0); |
744 | } | |
745 | ||
b19686e0 | 746 | /* See minsyms.h. */ |
c906108c | 747 | |
7cbd4a93 | 748 | struct bound_minimal_symbol |
fba45db2 | 749 | lookup_minimal_symbol_by_pc (CORE_ADDR pc) |
c906108c | 750 | { |
7cbd4a93 TT |
751 | struct obj_section *section = find_pc_section (pc); |
752 | ||
753 | if (section == NULL) | |
754 | { | |
755 | struct bound_minimal_symbol result; | |
756 | ||
757 | memset (&result, 0, sizeof (result)); | |
758 | return result; | |
759 | } | |
760 | return lookup_minimal_symbol_by_pc_section_1 (pc, section, 0); | |
c906108c | 761 | } |
0d5392b8 | 762 | |
0875794a JK |
763 | /* Return non-zero iff PC is in an STT_GNU_IFUNC function resolver. */ |
764 | ||
765 | int | |
766 | in_gnu_ifunc_stub (CORE_ADDR pc) | |
767 | { | |
7cbd4a93 | 768 | struct bound_minimal_symbol msymbol = lookup_minimal_symbol_by_pc (pc); |
0875794a | 769 | |
7cbd4a93 | 770 | return msymbol.minsym && MSYMBOL_TYPE (msymbol.minsym) == mst_text_gnu_ifunc; |
0875794a JK |
771 | } |
772 | ||
07be84bf JK |
773 | /* See elf_gnu_ifunc_resolve_addr for its real implementation. */ |
774 | ||
775 | static CORE_ADDR | |
776 | stub_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
777 | { | |
778 | error (_("GDB cannot resolve STT_GNU_IFUNC symbol at address %s without " | |
779 | "the ELF support compiled in."), | |
780 | paddress (gdbarch, pc)); | |
781 | } | |
782 | ||
783 | /* See elf_gnu_ifunc_resolve_name for its real implementation. */ | |
784 | ||
785 | static int | |
786 | stub_gnu_ifunc_resolve_name (const char *function_name, | |
787 | CORE_ADDR *function_address_p) | |
788 | { | |
789 | error (_("GDB cannot resolve STT_GNU_IFUNC symbol \"%s\" without " | |
790 | "the ELF support compiled in."), | |
791 | function_name); | |
792 | } | |
793 | ||
0e30163f JK |
794 | /* See elf_gnu_ifunc_resolver_stop for its real implementation. */ |
795 | ||
796 | static void | |
797 | stub_gnu_ifunc_resolver_stop (struct breakpoint *b) | |
798 | { | |
799 | internal_error (__FILE__, __LINE__, | |
800 | _("elf_gnu_ifunc_resolver_stop cannot be reached.")); | |
801 | } | |
802 | ||
803 | /* See elf_gnu_ifunc_resolver_return_stop for its real implementation. */ | |
804 | ||
805 | static void | |
806 | stub_gnu_ifunc_resolver_return_stop (struct breakpoint *b) | |
807 | { | |
808 | internal_error (__FILE__, __LINE__, | |
809 | _("elf_gnu_ifunc_resolver_return_stop cannot be reached.")); | |
810 | } | |
811 | ||
07be84bf JK |
812 | /* See elf_gnu_ifunc_fns for its real implementation. */ |
813 | ||
814 | static const struct gnu_ifunc_fns stub_gnu_ifunc_fns = | |
815 | { | |
816 | stub_gnu_ifunc_resolve_addr, | |
817 | stub_gnu_ifunc_resolve_name, | |
0e30163f JK |
818 | stub_gnu_ifunc_resolver_stop, |
819 | stub_gnu_ifunc_resolver_return_stop, | |
07be84bf JK |
820 | }; |
821 | ||
822 | /* A placeholder for &elf_gnu_ifunc_fns. */ | |
823 | ||
824 | const struct gnu_ifunc_fns *gnu_ifunc_fns_p = &stub_gnu_ifunc_fns; | |
825 | ||
b19686e0 | 826 | /* See minsyms.h. */ |
0d5392b8 | 827 | |
7cbd4a93 TT |
828 | struct bound_minimal_symbol |
829 | lookup_minimal_symbol_and_objfile (const char *name) | |
0d5392b8 | 830 | { |
7cbd4a93 | 831 | struct bound_minimal_symbol result; |
0d5392b8 TT |
832 | struct objfile *objfile; |
833 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; | |
834 | ||
835 | ALL_OBJFILES (objfile) | |
836 | { | |
837 | struct minimal_symbol *msym; | |
838 | ||
34643a32 | 839 | for (msym = objfile->per_bfd->msymbol_hash[hash]; |
0d5392b8 TT |
840 | msym != NULL; |
841 | msym = msym->hash_next) | |
842 | { | |
efd66ac6 | 843 | if (strcmp (MSYMBOL_LINKAGE_NAME (msym), name) == 0) |
0d5392b8 | 844 | { |
7cbd4a93 TT |
845 | result.minsym = msym; |
846 | result.objfile = objfile; | |
847 | return result; | |
0d5392b8 TT |
848 | } |
849 | } | |
850 | } | |
851 | ||
7cbd4a93 TT |
852 | memset (&result, 0, sizeof (result)); |
853 | return result; | |
0d5392b8 | 854 | } |
c906108c | 855 | \f |
c5aa993b | 856 | |
025bb325 | 857 | /* Return leading symbol character for a BFD. If BFD is NULL, |
c906108c SS |
858 | return the leading symbol character from the main objfile. */ |
859 | ||
c906108c | 860 | static int |
fba45db2 | 861 | get_symbol_leading_char (bfd *abfd) |
c906108c SS |
862 | { |
863 | if (abfd != NULL) | |
864 | return bfd_get_symbol_leading_char (abfd); | |
865 | if (symfile_objfile != NULL && symfile_objfile->obfd != NULL) | |
866 | return bfd_get_symbol_leading_char (symfile_objfile->obfd); | |
867 | return 0; | |
868 | } | |
869 | ||
b19686e0 | 870 | /* See minsyms.h. */ |
c906108c SS |
871 | |
872 | void | |
fba45db2 | 873 | init_minimal_symbol_collection (void) |
c906108c SS |
874 | { |
875 | msym_count = 0; | |
876 | msym_bunch = NULL; | |
b19686e0 TT |
877 | /* Note that presetting msym_bunch_index to BUNCH_SIZE causes the |
878 | first call to save a minimal symbol to allocate the memory for | |
879 | the first bunch. */ | |
c906108c SS |
880 | msym_bunch_index = BUNCH_SIZE; |
881 | } | |
882 | ||
b19686e0 TT |
883 | /* See minsyms.h. */ |
884 | ||
c906108c | 885 | void |
fba45db2 KB |
886 | prim_record_minimal_symbol (const char *name, CORE_ADDR address, |
887 | enum minimal_symbol_type ms_type, | |
888 | struct objfile *objfile) | |
c906108c SS |
889 | { |
890 | int section; | |
891 | ||
892 | switch (ms_type) | |
893 | { | |
894 | case mst_text: | |
0875794a | 895 | case mst_text_gnu_ifunc: |
c906108c SS |
896 | case mst_file_text: |
897 | case mst_solib_trampoline: | |
b8fbeb18 | 898 | section = SECT_OFF_TEXT (objfile); |
c906108c SS |
899 | break; |
900 | case mst_data: | |
901 | case mst_file_data: | |
b8fbeb18 | 902 | section = SECT_OFF_DATA (objfile); |
c906108c SS |
903 | break; |
904 | case mst_bss: | |
905 | case mst_file_bss: | |
b8fbeb18 | 906 | section = SECT_OFF_BSS (objfile); |
c906108c SS |
907 | break; |
908 | default: | |
909 | section = -1; | |
910 | } | |
911 | ||
912 | prim_record_minimal_symbol_and_info (name, address, ms_type, | |
e6dc44a8 | 913 | section, objfile); |
c906108c SS |
914 | } |
915 | ||
b19686e0 | 916 | /* See minsyms.h. */ |
c906108c SS |
917 | |
918 | struct minimal_symbol * | |
04a679b8 TT |
919 | prim_record_minimal_symbol_full (const char *name, int name_len, int copy_name, |
920 | CORE_ADDR address, | |
921 | enum minimal_symbol_type ms_type, | |
922 | int section, | |
04a679b8 | 923 | struct objfile *objfile) |
c906108c | 924 | { |
714835d5 | 925 | struct obj_section *obj_section; |
52f0bd74 AC |
926 | struct msym_bunch *new; |
927 | struct minimal_symbol *msymbol; | |
c906108c | 928 | |
66337bb1 CV |
929 | /* Don't put gcc_compiled, __gnu_compiled_cplus, and friends into |
930 | the minimal symbols, because if there is also another symbol | |
931 | at the same address (e.g. the first function of the file), | |
932 | lookup_minimal_symbol_by_pc would have no way of getting the | |
933 | right one. */ | |
934 | if (ms_type == mst_file_text && name[0] == 'g' | |
935 | && (strcmp (name, GCC_COMPILED_FLAG_SYMBOL) == 0 | |
936 | || strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0)) | |
937 | return (NULL); | |
938 | ||
939 | /* It's safe to strip the leading char here once, since the name | |
025bb325 | 940 | is also stored stripped in the minimal symbol table. */ |
66337bb1 | 941 | if (name[0] == get_symbol_leading_char (objfile->obfd)) |
04a679b8 TT |
942 | { |
943 | ++name; | |
944 | --name_len; | |
945 | } | |
66337bb1 CV |
946 | |
947 | if (ms_type == mst_file_text && strncmp (name, "__gnu_compiled", 14) == 0) | |
948 | return (NULL); | |
c906108c SS |
949 | |
950 | if (msym_bunch_index == BUNCH_SIZE) | |
951 | { | |
fc270c35 | 952 | new = XCNEW (struct msym_bunch); |
c906108c | 953 | msym_bunch_index = 0; |
c5aa993b | 954 | new->next = msym_bunch; |
c906108c SS |
955 | msym_bunch = new; |
956 | } | |
c5aa993b | 957 | msymbol = &msym_bunch->contents[msym_bunch_index]; |
34643a32 TT |
958 | MSYMBOL_SET_LANGUAGE (msymbol, language_auto, |
959 | &objfile->per_bfd->storage_obstack); | |
efd66ac6 | 960 | MSYMBOL_SET_NAMES (msymbol, name, name_len, copy_name, objfile); |
2de7ced7 | 961 | |
40c1a007 | 962 | SET_MSYMBOL_VALUE_ADDRESS (msymbol, address); |
efd66ac6 | 963 | MSYMBOL_SECTION (msymbol) = section; |
714835d5 | 964 | |
c906108c | 965 | MSYMBOL_TYPE (msymbol) = ms_type; |
b887350f TT |
966 | MSYMBOL_TARGET_FLAG_1 (msymbol) = 0; |
967 | MSYMBOL_TARGET_FLAG_2 (msymbol) = 0; | |
d9eaeb59 JB |
968 | /* Do not use the SET_MSYMBOL_SIZE macro to initialize the size, |
969 | as it would also set the has_size flag. */ | |
970 | msymbol->size = 0; | |
9227b5eb | 971 | |
a79dea61 | 972 | /* The hash pointers must be cleared! If they're not, |
025bb325 | 973 | add_minsym_to_hash_table will NOT add this msymbol to the hash table. */ |
9227b5eb JB |
974 | msymbol->hash_next = NULL; |
975 | msymbol->demangled_hash_next = NULL; | |
976 | ||
34643a32 TT |
977 | /* If we already read minimal symbols for this objfile, then don't |
978 | ever allocate a new one. */ | |
979 | if (!objfile->per_bfd->minsyms_read) | |
5f6cac40 TT |
980 | { |
981 | msym_bunch_index++; | |
982 | objfile->per_bfd->n_minsyms++; | |
983 | } | |
c906108c | 984 | msym_count++; |
c906108c SS |
985 | return msymbol; |
986 | } | |
987 | ||
b19686e0 | 988 | /* See minsyms.h. */ |
04a679b8 TT |
989 | |
990 | struct minimal_symbol * | |
991 | prim_record_minimal_symbol_and_info (const char *name, CORE_ADDR address, | |
992 | enum minimal_symbol_type ms_type, | |
993 | int section, | |
04a679b8 TT |
994 | struct objfile *objfile) |
995 | { | |
996 | return prim_record_minimal_symbol_full (name, strlen (name), 1, | |
e6dc44a8 TT |
997 | address, ms_type, |
998 | section, objfile); | |
04a679b8 TT |
999 | } |
1000 | ||
c906108c | 1001 | /* Compare two minimal symbols by address and return a signed result based |
025bb325 | 1002 | on unsigned comparisons, so that we sort into unsigned numeric order. |
c906108c SS |
1003 | Within groups with the same address, sort by name. */ |
1004 | ||
1005 | static int | |
12b9c64f | 1006 | compare_minimal_symbols (const void *fn1p, const void *fn2p) |
c906108c | 1007 | { |
52f0bd74 AC |
1008 | const struct minimal_symbol *fn1; |
1009 | const struct minimal_symbol *fn2; | |
c906108c SS |
1010 | |
1011 | fn1 = (const struct minimal_symbol *) fn1p; | |
1012 | fn2 = (const struct minimal_symbol *) fn2p; | |
1013 | ||
77e371c0 | 1014 | if (MSYMBOL_VALUE_RAW_ADDRESS (fn1) < MSYMBOL_VALUE_RAW_ADDRESS (fn2)) |
c906108c | 1015 | { |
025bb325 | 1016 | return (-1); /* addr 1 is less than addr 2. */ |
c906108c | 1017 | } |
77e371c0 | 1018 | else if (MSYMBOL_VALUE_RAW_ADDRESS (fn1) > MSYMBOL_VALUE_RAW_ADDRESS (fn2)) |
c906108c | 1019 | { |
025bb325 | 1020 | return (1); /* addr 1 is greater than addr 2. */ |
c906108c | 1021 | } |
c5aa993b JM |
1022 | else |
1023 | /* addrs are equal: sort by name */ | |
c906108c | 1024 | { |
efd66ac6 TT |
1025 | const char *name1 = MSYMBOL_LINKAGE_NAME (fn1); |
1026 | const char *name2 = MSYMBOL_LINKAGE_NAME (fn2); | |
c906108c SS |
1027 | |
1028 | if (name1 && name2) /* both have names */ | |
1029 | return strcmp (name1, name2); | |
1030 | else if (name2) | |
025bb325 MS |
1031 | return 1; /* fn1 has no name, so it is "less". */ |
1032 | else if (name1) /* fn2 has no name, so it is "less". */ | |
c906108c SS |
1033 | return -1; |
1034 | else | |
025bb325 | 1035 | return (0); /* Neither has a name, so they're equal. */ |
c906108c SS |
1036 | } |
1037 | } | |
1038 | ||
1039 | /* Discard the currently collected minimal symbols, if any. If we wish | |
1040 | to save them for later use, we must have already copied them somewhere | |
1041 | else before calling this function. | |
1042 | ||
1043 | FIXME: We could allocate the minimal symbol bunches on their own | |
1044 | obstack and then simply blow the obstack away when we are done with | |
025bb325 | 1045 | it. Is it worth the extra trouble though? */ |
c906108c | 1046 | |
56e290f4 AC |
1047 | static void |
1048 | do_discard_minimal_symbols_cleanup (void *arg) | |
c906108c | 1049 | { |
52f0bd74 | 1050 | struct msym_bunch *next; |
c906108c SS |
1051 | |
1052 | while (msym_bunch != NULL) | |
1053 | { | |
c5aa993b | 1054 | next = msym_bunch->next; |
b8c9b27d | 1055 | xfree (msym_bunch); |
c906108c SS |
1056 | msym_bunch = next; |
1057 | } | |
1058 | } | |
1059 | ||
b19686e0 TT |
1060 | /* See minsyms.h. */ |
1061 | ||
56e290f4 AC |
1062 | struct cleanup * |
1063 | make_cleanup_discard_minimal_symbols (void) | |
1064 | { | |
1065 | return make_cleanup (do_discard_minimal_symbols_cleanup, 0); | |
1066 | } | |
1067 | ||
1068 | ||
9227b5eb | 1069 | |
c906108c SS |
1070 | /* Compact duplicate entries out of a minimal symbol table by walking |
1071 | through the table and compacting out entries with duplicate addresses | |
1072 | and matching names. Return the number of entries remaining. | |
1073 | ||
1074 | On entry, the table resides between msymbol[0] and msymbol[mcount]. | |
1075 | On exit, it resides between msymbol[0] and msymbol[result_count]. | |
1076 | ||
1077 | When files contain multiple sources of symbol information, it is | |
1078 | possible for the minimal symbol table to contain many duplicate entries. | |
1079 | As an example, SVR4 systems use ELF formatted object files, which | |
1080 | usually contain at least two different types of symbol tables (a | |
1081 | standard ELF one and a smaller dynamic linking table), as well as | |
1082 | DWARF debugging information for files compiled with -g. | |
1083 | ||
1084 | Without compacting, the minimal symbol table for gdb itself contains | |
1085 | over a 1000 duplicates, about a third of the total table size. Aside | |
1086 | from the potential trap of not noticing that two successive entries | |
1087 | identify the same location, this duplication impacts the time required | |
1088 | to linearly scan the table, which is done in a number of places. So we | |
1089 | just do one linear scan here and toss out the duplicates. | |
1090 | ||
1091 | Note that we are not concerned here about recovering the space that | |
1092 | is potentially freed up, because the strings themselves are allocated | |
34643a32 | 1093 | on the storage_obstack, and will get automatically freed when the symbol |
c906108c SS |
1094 | table is freed. The caller can free up the unused minimal symbols at |
1095 | the end of the compacted region if their allocation strategy allows it. | |
1096 | ||
1097 | Also note we only go up to the next to last entry within the loop | |
1098 | and then copy the last entry explicitly after the loop terminates. | |
1099 | ||
1100 | Since the different sources of information for each symbol may | |
1101 | have different levels of "completeness", we may have duplicates | |
1102 | that have one entry with type "mst_unknown" and the other with a | |
1103 | known type. So if the one we are leaving alone has type mst_unknown, | |
1104 | overwrite its type with the type from the one we are compacting out. */ | |
1105 | ||
1106 | static int | |
fba45db2 KB |
1107 | compact_minimal_symbols (struct minimal_symbol *msymbol, int mcount, |
1108 | struct objfile *objfile) | |
c906108c SS |
1109 | { |
1110 | struct minimal_symbol *copyfrom; | |
1111 | struct minimal_symbol *copyto; | |
1112 | ||
1113 | if (mcount > 0) | |
1114 | { | |
1115 | copyfrom = copyto = msymbol; | |
1116 | while (copyfrom < msymbol + mcount - 1) | |
1117 | { | |
77e371c0 TT |
1118 | if (MSYMBOL_VALUE_RAW_ADDRESS (copyfrom) |
1119 | == MSYMBOL_VALUE_RAW_ADDRESS ((copyfrom + 1)) | |
1120 | && MSYMBOL_SECTION (copyfrom) == MSYMBOL_SECTION (copyfrom + 1) | |
efd66ac6 TT |
1121 | && strcmp (MSYMBOL_LINKAGE_NAME (copyfrom), |
1122 | MSYMBOL_LINKAGE_NAME ((copyfrom + 1))) == 0) | |
c906108c | 1123 | { |
c5aa993b | 1124 | if (MSYMBOL_TYPE ((copyfrom + 1)) == mst_unknown) |
c906108c SS |
1125 | { |
1126 | MSYMBOL_TYPE ((copyfrom + 1)) = MSYMBOL_TYPE (copyfrom); | |
1127 | } | |
1128 | copyfrom++; | |
1129 | } | |
1130 | else | |
afbb8d7a | 1131 | *copyto++ = *copyfrom++; |
c906108c SS |
1132 | } |
1133 | *copyto++ = *copyfrom++; | |
1134 | mcount = copyto - msymbol; | |
1135 | } | |
1136 | return (mcount); | |
1137 | } | |
1138 | ||
afbb8d7a KB |
1139 | /* Build (or rebuild) the minimal symbol hash tables. This is necessary |
1140 | after compacting or sorting the table since the entries move around | |
025bb325 | 1141 | thus causing the internal minimal_symbol pointers to become jumbled. */ |
afbb8d7a KB |
1142 | |
1143 | static void | |
1144 | build_minimal_symbol_hash_tables (struct objfile *objfile) | |
1145 | { | |
1146 | int i; | |
1147 | struct minimal_symbol *msym; | |
1148 | ||
025bb325 | 1149 | /* Clear the hash tables. */ |
afbb8d7a KB |
1150 | for (i = 0; i < MINIMAL_SYMBOL_HASH_SIZE; i++) |
1151 | { | |
34643a32 TT |
1152 | objfile->per_bfd->msymbol_hash[i] = 0; |
1153 | objfile->per_bfd->msymbol_demangled_hash[i] = 0; | |
afbb8d7a KB |
1154 | } |
1155 | ||
025bb325 | 1156 | /* Now, (re)insert the actual entries. */ |
34643a32 TT |
1157 | for ((i = objfile->per_bfd->minimal_symbol_count, |
1158 | msym = objfile->per_bfd->msymbols); | |
afbb8d7a KB |
1159 | i > 0; |
1160 | i--, msym++) | |
1161 | { | |
1162 | msym->hash_next = 0; | |
34643a32 | 1163 | add_minsym_to_hash_table (msym, objfile->per_bfd->msymbol_hash); |
afbb8d7a KB |
1164 | |
1165 | msym->demangled_hash_next = 0; | |
efd66ac6 | 1166 | if (MSYMBOL_SEARCH_NAME (msym) != MSYMBOL_LINKAGE_NAME (msym)) |
afbb8d7a | 1167 | add_minsym_to_demangled_hash_table (msym, |
34643a32 | 1168 | objfile->per_bfd->msymbol_demangled_hash); |
afbb8d7a KB |
1169 | } |
1170 | } | |
1171 | ||
c906108c SS |
1172 | /* Add the minimal symbols in the existing bunches to the objfile's official |
1173 | minimal symbol table. In most cases there is no minimal symbol table yet | |
1174 | for this objfile, and the existing bunches are used to create one. Once | |
1175 | in a while (for shared libraries for example), we add symbols (e.g. common | |
1176 | symbols) to an existing objfile. | |
1177 | ||
1178 | Because of the way minimal symbols are collected, we generally have no way | |
1179 | of knowing what source language applies to any particular minimal symbol. | |
1180 | Specifically, we have no way of knowing if the minimal symbol comes from a | |
1181 | C++ compilation unit or not. So for the sake of supporting cached | |
1182 | demangled C++ names, we have no choice but to try and demangle each new one | |
1183 | that comes in. If the demangling succeeds, then we assume it is a C++ | |
1184 | symbol and set the symbol's language and demangled name fields | |
1185 | appropriately. Note that in order to avoid unnecessary demanglings, and | |
1186 | allocating obstack space that subsequently can't be freed for the demangled | |
1187 | names, we mark all newly added symbols with language_auto. After | |
1188 | compaction of the minimal symbols, we go back and scan the entire minimal | |
1189 | symbol table looking for these new symbols. For each new symbol we attempt | |
1190 | to demangle it, and if successful, record it as a language_cplus symbol | |
1191 | and cache the demangled form on the symbol obstack. Symbols which don't | |
1192 | demangle are marked as language_unknown symbols, which inhibits future | |
025bb325 | 1193 | attempts to demangle them if we later add more minimal symbols. */ |
c906108c SS |
1194 | |
1195 | void | |
fba45db2 | 1196 | install_minimal_symbols (struct objfile *objfile) |
c906108c | 1197 | { |
52f0bd74 AC |
1198 | int bindex; |
1199 | int mcount; | |
1200 | struct msym_bunch *bunch; | |
1201 | struct minimal_symbol *msymbols; | |
c906108c | 1202 | int alloc_count; |
c906108c | 1203 | |
34643a32 TT |
1204 | if (objfile->per_bfd->minsyms_read) |
1205 | return; | |
1206 | ||
c906108c SS |
1207 | if (msym_count > 0) |
1208 | { | |
45cfd468 DE |
1209 | if (symtab_create_debug) |
1210 | { | |
1211 | fprintf_unfiltered (gdb_stdlog, | |
1212 | "Installing %d minimal symbols of objfile %s.\n", | |
4262abfb | 1213 | msym_count, objfile_name (objfile)); |
45cfd468 DE |
1214 | } |
1215 | ||
c906108c | 1216 | /* Allocate enough space in the obstack, into which we will gather the |
c5aa993b JM |
1217 | bunches of new and existing minimal symbols, sort them, and then |
1218 | compact out the duplicate entries. Once we have a final table, | |
1219 | we will give back the excess space. */ | |
c906108c | 1220 | |
34643a32 TT |
1221 | alloc_count = msym_count + objfile->per_bfd->minimal_symbol_count + 1; |
1222 | obstack_blank (&objfile->per_bfd->storage_obstack, | |
c906108c SS |
1223 | alloc_count * sizeof (struct minimal_symbol)); |
1224 | msymbols = (struct minimal_symbol *) | |
34643a32 | 1225 | obstack_base (&objfile->per_bfd->storage_obstack); |
c906108c SS |
1226 | |
1227 | /* Copy in the existing minimal symbols, if there are any. */ | |
1228 | ||
34643a32 TT |
1229 | if (objfile->per_bfd->minimal_symbol_count) |
1230 | memcpy ((char *) msymbols, (char *) objfile->per_bfd->msymbols, | |
1231 | objfile->per_bfd->minimal_symbol_count * sizeof (struct minimal_symbol)); | |
c906108c SS |
1232 | |
1233 | /* Walk through the list of minimal symbol bunches, adding each symbol | |
c5aa993b JM |
1234 | to the new contiguous array of symbols. Note that we start with the |
1235 | current, possibly partially filled bunch (thus we use the current | |
1236 | msym_bunch_index for the first bunch we copy over), and thereafter | |
025bb325 | 1237 | each bunch is full. */ |
c5aa993b | 1238 | |
34643a32 | 1239 | mcount = objfile->per_bfd->minimal_symbol_count; |
c5aa993b JM |
1240 | |
1241 | for (bunch = msym_bunch; bunch != NULL; bunch = bunch->next) | |
c906108c SS |
1242 | { |
1243 | for (bindex = 0; bindex < msym_bunch_index; bindex++, mcount++) | |
66337bb1 | 1244 | msymbols[mcount] = bunch->contents[bindex]; |
c906108c SS |
1245 | msym_bunch_index = BUNCH_SIZE; |
1246 | } | |
1247 | ||
1248 | /* Sort the minimal symbols by address. */ | |
c5aa993b | 1249 | |
c906108c SS |
1250 | qsort (msymbols, mcount, sizeof (struct minimal_symbol), |
1251 | compare_minimal_symbols); | |
c5aa993b | 1252 | |
c906108c | 1253 | /* Compact out any duplicates, and free up whatever space we are |
c5aa993b JM |
1254 | no longer using. */ |
1255 | ||
9227b5eb | 1256 | mcount = compact_minimal_symbols (msymbols, mcount, objfile); |
c906108c | 1257 | |
34643a32 | 1258 | obstack_blank (&objfile->per_bfd->storage_obstack, |
c5aa993b | 1259 | (mcount + 1 - alloc_count) * sizeof (struct minimal_symbol)); |
c906108c | 1260 | msymbols = (struct minimal_symbol *) |
34643a32 | 1261 | obstack_finish (&objfile->per_bfd->storage_obstack); |
c906108c SS |
1262 | |
1263 | /* We also terminate the minimal symbol table with a "null symbol", | |
c5aa993b JM |
1264 | which is *not* included in the size of the table. This makes it |
1265 | easier to find the end of the table when we are handed a pointer | |
1266 | to some symbol in the middle of it. Zero out the fields in the | |
1267 | "null symbol" allocated at the end of the array. Note that the | |
1268 | symbol count does *not* include this null symbol, which is why it | |
025bb325 | 1269 | is indexed by mcount and not mcount-1. */ |
c906108c | 1270 | |
a83e9154 | 1271 | memset (&msymbols[mcount], 0, sizeof (struct minimal_symbol)); |
c906108c SS |
1272 | |
1273 | /* Attach the minimal symbol table to the specified objfile. | |
34643a32 | 1274 | The strings themselves are also located in the storage_obstack |
c5aa993b | 1275 | of this objfile. */ |
c906108c | 1276 | |
34643a32 TT |
1277 | objfile->per_bfd->minimal_symbol_count = mcount; |
1278 | objfile->per_bfd->msymbols = msymbols; | |
c906108c | 1279 | |
afbb8d7a KB |
1280 | /* Now build the hash tables; we can't do this incrementally |
1281 | at an earlier point since we weren't finished with the obstack | |
1282 | yet. (And if the msymbol obstack gets moved, all the internal | |
025bb325 | 1283 | pointers to other msymbols need to be adjusted.) */ |
afbb8d7a | 1284 | build_minimal_symbol_hash_tables (objfile); |
c906108c SS |
1285 | } |
1286 | } | |
1287 | ||
c35384fb TT |
1288 | /* See minsyms.h. */ |
1289 | ||
1290 | void | |
1291 | terminate_minimal_symbol_table (struct objfile *objfile) | |
1292 | { | |
34643a32 TT |
1293 | if (! objfile->per_bfd->msymbols) |
1294 | objfile->per_bfd->msymbols | |
1295 | = ((struct minimal_symbol *) | |
1296 | obstack_alloc (&objfile->per_bfd->storage_obstack, | |
1297 | sizeof (struct minimal_symbol))); | |
c35384fb TT |
1298 | |
1299 | { | |
1300 | struct minimal_symbol *m | |
34643a32 | 1301 | = &objfile->per_bfd->msymbols[objfile->per_bfd->minimal_symbol_count]; |
c35384fb TT |
1302 | |
1303 | memset (m, 0, sizeof (*m)); | |
1304 | /* Don't rely on these enumeration values being 0's. */ | |
1305 | MSYMBOL_TYPE (m) = mst_unknown; | |
34643a32 TT |
1306 | MSYMBOL_SET_LANGUAGE (m, language_unknown, |
1307 | &objfile->per_bfd->storage_obstack); | |
c35384fb TT |
1308 | } |
1309 | } | |
1310 | ||
c9630d9c TT |
1311 | /* Check if PC is in a shared library trampoline code stub. |
1312 | Return minimal symbol for the trampoline entry or NULL if PC is not | |
1313 | in a trampoline code stub. */ | |
c906108c | 1314 | |
c9630d9c | 1315 | static struct minimal_symbol * |
fba45db2 | 1316 | lookup_solib_trampoline_symbol_by_pc (CORE_ADDR pc) |
c906108c | 1317 | { |
2eaf8d2a | 1318 | struct obj_section *section = find_pc_section (pc); |
7cbd4a93 | 1319 | struct bound_minimal_symbol msymbol; |
2eaf8d2a DJ |
1320 | |
1321 | if (section == NULL) | |
1322 | return NULL; | |
714835d5 | 1323 | msymbol = lookup_minimal_symbol_by_pc_section_1 (pc, section, 1); |
c906108c | 1324 | |
7cbd4a93 TT |
1325 | if (msymbol.minsym != NULL |
1326 | && MSYMBOL_TYPE (msymbol.minsym) == mst_solib_trampoline) | |
1327 | return msymbol.minsym; | |
c906108c SS |
1328 | return NULL; |
1329 | } | |
1330 | ||
1331 | /* If PC is in a shared library trampoline code stub, return the | |
1332 | address of the `real' function belonging to the stub. | |
1333 | Return 0 if PC is not in a trampoline code stub or if the real | |
1334 | function is not found in the minimal symbol table. | |
1335 | ||
1336 | We may fail to find the right function if a function with the | |
1337 | same name is defined in more than one shared library, but this | |
025bb325 | 1338 | is considered bad programming style. We could return 0 if we find |
c906108c SS |
1339 | a duplicate function in case this matters someday. */ |
1340 | ||
1341 | CORE_ADDR | |
52f729a7 | 1342 | find_solib_trampoline_target (struct frame_info *frame, CORE_ADDR pc) |
c906108c SS |
1343 | { |
1344 | struct objfile *objfile; | |
1345 | struct minimal_symbol *msymbol; | |
1346 | struct minimal_symbol *tsymbol = lookup_solib_trampoline_symbol_by_pc (pc); | |
1347 | ||
1348 | if (tsymbol != NULL) | |
1349 | { | |
1350 | ALL_MSYMBOLS (objfile, msymbol) | |
c5aa993b | 1351 | { |
0875794a JK |
1352 | if ((MSYMBOL_TYPE (msymbol) == mst_text |
1353 | || MSYMBOL_TYPE (msymbol) == mst_text_gnu_ifunc) | |
efd66ac6 TT |
1354 | && strcmp (MSYMBOL_LINKAGE_NAME (msymbol), |
1355 | MSYMBOL_LINKAGE_NAME (tsymbol)) == 0) | |
77e371c0 | 1356 | return MSYMBOL_VALUE_ADDRESS (objfile, msymbol); |
42848c96 UW |
1357 | |
1358 | /* Also handle minimal symbols pointing to function descriptors. */ | |
1359 | if (MSYMBOL_TYPE (msymbol) == mst_data | |
efd66ac6 TT |
1360 | && strcmp (MSYMBOL_LINKAGE_NAME (msymbol), |
1361 | MSYMBOL_LINKAGE_NAME (tsymbol)) == 0) | |
42848c96 UW |
1362 | { |
1363 | CORE_ADDR func; | |
b8d56208 | 1364 | |
42848c96 UW |
1365 | func = gdbarch_convert_from_func_ptr_addr |
1366 | (get_objfile_arch (objfile), | |
77e371c0 | 1367 | MSYMBOL_VALUE_ADDRESS (objfile, msymbol), |
42848c96 UW |
1368 | ¤t_target); |
1369 | ||
1370 | /* Ignore data symbols that are not function descriptors. */ | |
77e371c0 | 1371 | if (func != MSYMBOL_VALUE_ADDRESS (objfile, msymbol)) |
42848c96 UW |
1372 | return func; |
1373 | } | |
c5aa993b | 1374 | } |
c906108c SS |
1375 | } |
1376 | return 0; | |
1377 | } | |
50e65b17 TT |
1378 | |
1379 | /* See minsyms.h. */ | |
1380 | ||
1381 | CORE_ADDR | |
1382 | minimal_symbol_upper_bound (struct bound_minimal_symbol minsym) | |
1383 | { | |
1384 | int i; | |
1385 | short section; | |
1386 | struct obj_section *obj_section; | |
1387 | CORE_ADDR result; | |
1388 | struct minimal_symbol *msymbol; | |
1389 | ||
1390 | gdb_assert (minsym.minsym != NULL); | |
1391 | ||
1392 | /* If the minimal symbol has a size, use it. Otherwise use the | |
1393 | lesser of the next minimal symbol in the same section, or the end | |
1394 | of the section, as the end of the function. */ | |
1395 | ||
1396 | if (MSYMBOL_SIZE (minsym.minsym) != 0) | |
77e371c0 | 1397 | return BMSYMBOL_VALUE_ADDRESS (minsym) + MSYMBOL_SIZE (minsym.minsym); |
50e65b17 TT |
1398 | |
1399 | /* Step over other symbols at this same address, and symbols in | |
1400 | other sections, to find the next symbol in this section with a | |
1401 | different address. */ | |
1402 | ||
1403 | msymbol = minsym.minsym; | |
efd66ac6 TT |
1404 | section = MSYMBOL_SECTION (msymbol); |
1405 | for (i = 1; MSYMBOL_LINKAGE_NAME (msymbol + i) != NULL; i++) | |
50e65b17 | 1406 | { |
77e371c0 TT |
1407 | if ((MSYMBOL_VALUE_RAW_ADDRESS (msymbol + i) |
1408 | != MSYMBOL_VALUE_RAW_ADDRESS (msymbol)) | |
efd66ac6 | 1409 | && MSYMBOL_SECTION (msymbol + i) == section) |
50e65b17 TT |
1410 | break; |
1411 | } | |
1412 | ||
efd66ac6 TT |
1413 | obj_section = MSYMBOL_OBJ_SECTION (minsym.objfile, minsym.minsym); |
1414 | if (MSYMBOL_LINKAGE_NAME (msymbol + i) != NULL | |
77e371c0 | 1415 | && (MSYMBOL_VALUE_ADDRESS (minsym.objfile, msymbol + i) |
efd66ac6 | 1416 | < obj_section_endaddr (obj_section))) |
77e371c0 | 1417 | result = MSYMBOL_VALUE_ADDRESS (minsym.objfile, msymbol + i); |
50e65b17 TT |
1418 | else |
1419 | /* We got the start address from the last msymbol in the objfile. | |
1420 | So the end address is the end of the section. */ | |
1421 | result = obj_section_endaddr (obj_section); | |
1422 | ||
1423 | return result; | |
1424 | } |