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c906108c | 1 | /* GDB routines for manipulating the minimal symbol tables. |
e2882c85 | 2 | Copyright (C) 1992-2018 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> |
c906108c SS |
41 | #include "symtab.h" |
42 | #include "bfd.h" | |
0ba1096a | 43 | #include "filenames.h" |
c906108c SS |
44 | #include "symfile.h" |
45 | #include "objfiles.h" | |
46 | #include "demangle.h" | |
7ed49443 JB |
47 | #include "value.h" |
48 | #include "cp-abi.h" | |
42848c96 | 49 | #include "target.h" |
71c25dea TT |
50 | #include "cp-support.h" |
51 | #include "language.h" | |
529480d0 | 52 | #include "cli/cli-utils.h" |
bd9269f7 | 53 | #include "symbol.h" |
b5ec771e | 54 | #include <algorithm> |
deeeba55 | 55 | #include "safe-ctype.h" |
c906108c | 56 | |
bf223d3e PA |
57 | /* See minsyms.h. */ |
58 | ||
59 | bool | |
4024cf2b PA |
60 | msymbol_is_function (struct objfile *objfile, minimal_symbol *minsym, |
61 | CORE_ADDR *func_address_p) | |
bf223d3e | 62 | { |
4024cf2b PA |
63 | CORE_ADDR msym_addr = MSYMBOL_VALUE_ADDRESS (objfile, minsym); |
64 | ||
65 | switch (minsym->type) | |
bf223d3e | 66 | { |
4024cf2b PA |
67 | case mst_slot_got_plt: |
68 | case mst_data: | |
69 | case mst_bss: | |
70 | case mst_abs: | |
71 | case mst_file_data: | |
72 | case mst_file_bss: | |
f50776aa | 73 | case mst_data_gnu_ifunc: |
4024cf2b PA |
74 | { |
75 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
76 | CORE_ADDR pc = gdbarch_convert_from_func_ptr_addr (gdbarch, msym_addr, | |
f6ac5f3d | 77 | target_stack); |
4024cf2b PA |
78 | if (pc != msym_addr) |
79 | { | |
80 | if (func_address_p != NULL) | |
81 | *func_address_p = pc; | |
82 | return true; | |
83 | } | |
84 | return false; | |
85 | } | |
bf223d3e | 86 | default: |
4024cf2b PA |
87 | if (func_address_p != NULL) |
88 | *func_address_p = msym_addr; | |
89 | return true; | |
bf223d3e PA |
90 | } |
91 | } | |
92 | ||
c906108c SS |
93 | /* Accumulate the minimal symbols for each objfile in bunches of BUNCH_SIZE. |
94 | At the end, copy them all into one newly allocated location on an objfile's | |
34643a32 | 95 | per-BFD storage obstack. */ |
c906108c SS |
96 | |
97 | #define BUNCH_SIZE 127 | |
98 | ||
99 | struct msym_bunch | |
c5aa993b JM |
100 | { |
101 | struct msym_bunch *next; | |
102 | struct minimal_symbol contents[BUNCH_SIZE]; | |
103 | }; | |
c906108c | 104 | |
b19686e0 | 105 | /* See minsyms.h. */ |
9227b5eb JB |
106 | |
107 | unsigned int | |
108 | msymbol_hash_iw (const char *string) | |
109 | { | |
110 | unsigned int hash = 0; | |
b8d56208 | 111 | |
9227b5eb JB |
112 | while (*string && *string != '(') |
113 | { | |
f1735a53 | 114 | string = skip_spaces (string); |
9227b5eb | 115 | if (*string && *string != '(') |
375f3d86 | 116 | { |
59d7bcaf | 117 | hash = SYMBOL_HASH_NEXT (hash, *string); |
375f3d86 DJ |
118 | ++string; |
119 | } | |
9227b5eb | 120 | } |
261397f8 | 121 | return hash; |
9227b5eb JB |
122 | } |
123 | ||
b19686e0 | 124 | /* See minsyms.h. */ |
9227b5eb JB |
125 | |
126 | unsigned int | |
127 | msymbol_hash (const char *string) | |
128 | { | |
129 | unsigned int hash = 0; | |
b8d56208 | 130 | |
9227b5eb | 131 | for (; *string; ++string) |
59d7bcaf | 132 | hash = SYMBOL_HASH_NEXT (hash, *string); |
261397f8 | 133 | return hash; |
9227b5eb JB |
134 | } |
135 | ||
136 | /* Add the minimal symbol SYM to an objfile's minsym hash table, TABLE. */ | |
984ac464 | 137 | static void |
9227b5eb JB |
138 | add_minsym_to_hash_table (struct minimal_symbol *sym, |
139 | struct minimal_symbol **table) | |
140 | { | |
141 | if (sym->hash_next == NULL) | |
142 | { | |
f56f77c1 | 143 | unsigned int hash |
efd66ac6 | 144 | = msymbol_hash (MSYMBOL_LINKAGE_NAME (sym)) % MINIMAL_SYMBOL_HASH_SIZE; |
b8d56208 | 145 | |
9227b5eb JB |
146 | sym->hash_next = table[hash]; |
147 | table[hash] = sym; | |
148 | } | |
149 | } | |
150 | ||
0729fd50 DB |
151 | /* Add the minimal symbol SYM to an objfile's minsym demangled hash table, |
152 | TABLE. */ | |
153 | static void | |
154 | add_minsym_to_demangled_hash_table (struct minimal_symbol *sym, | |
b5ec771e | 155 | struct objfile *objfile) |
0729fd50 DB |
156 | { |
157 | if (sym->demangled_hash_next == NULL) | |
158 | { | |
b5ec771e PA |
159 | unsigned int hash = search_name_hash (MSYMBOL_LANGUAGE (sym), |
160 | MSYMBOL_SEARCH_NAME (sym)); | |
161 | ||
162 | auto &vec = objfile->per_bfd->demangled_hash_languages; | |
163 | auto it = std::lower_bound (vec.begin (), vec.end (), | |
164 | MSYMBOL_LANGUAGE (sym)); | |
165 | if (it == vec.end () || *it != MSYMBOL_LANGUAGE (sym)) | |
166 | vec.insert (it, MSYMBOL_LANGUAGE (sym)); | |
167 | ||
168 | struct minimal_symbol **table | |
169 | = objfile->per_bfd->msymbol_demangled_hash; | |
170 | unsigned int hash_index = hash % MINIMAL_SYMBOL_HASH_SIZE; | |
171 | sym->demangled_hash_next = table[hash_index]; | |
172 | table[hash_index] = sym; | |
173 | } | |
174 | } | |
b8d56208 | 175 | |
b5ec771e PA |
176 | /* Worker object for lookup_minimal_symbol. Stores temporary results |
177 | while walking the symbol tables. */ | |
178 | ||
179 | struct found_minimal_symbols | |
180 | { | |
181 | /* External symbols are best. */ | |
182 | bound_minimal_symbol external_symbol {}; | |
183 | ||
184 | /* File-local symbols are next best. */ | |
185 | bound_minimal_symbol file_symbol {}; | |
186 | ||
187 | /* Symbols for shared library trampolines are next best. */ | |
188 | bound_minimal_symbol trampoline_symbol {}; | |
189 | ||
190 | /* Called when a symbol name matches. Check if the minsym is a | |
191 | better type than what we had already found, and record it in one | |
192 | of the members fields if so. Returns true if we collected the | |
193 | real symbol, in which case we can stop searching. */ | |
194 | bool maybe_collect (const char *sfile, objfile *objf, | |
195 | minimal_symbol *msymbol); | |
196 | }; | |
197 | ||
198 | /* See declaration above. */ | |
199 | ||
200 | bool | |
201 | found_minimal_symbols::maybe_collect (const char *sfile, | |
202 | struct objfile *objfile, | |
203 | minimal_symbol *msymbol) | |
204 | { | |
205 | switch (MSYMBOL_TYPE (msymbol)) | |
206 | { | |
207 | case mst_file_text: | |
208 | case mst_file_data: | |
209 | case mst_file_bss: | |
210 | if (sfile == NULL | |
211 | || filename_cmp (msymbol->filename, sfile) == 0) | |
212 | { | |
213 | file_symbol.minsym = msymbol; | |
214 | file_symbol.objfile = objfile; | |
215 | } | |
216 | break; | |
217 | ||
218 | case mst_solib_trampoline: | |
219 | ||
220 | /* If a trampoline symbol is found, we prefer to keep | |
221 | looking for the *real* symbol. If the actual symbol | |
222 | is not found, then we'll use the trampoline | |
223 | entry. */ | |
224 | if (trampoline_symbol.minsym == NULL) | |
225 | { | |
226 | trampoline_symbol.minsym = msymbol; | |
227 | trampoline_symbol.objfile = objfile; | |
228 | } | |
229 | break; | |
230 | ||
231 | case mst_unknown: | |
232 | default: | |
233 | external_symbol.minsym = msymbol; | |
234 | external_symbol.objfile = objfile; | |
235 | /* We have the real symbol. No use looking further. */ | |
236 | return true; | |
237 | } | |
238 | ||
239 | /* Keep looking. */ | |
240 | return false; | |
241 | } | |
242 | ||
243 | /* Walk the mangled name hash table, and pass each symbol whose name | |
244 | matches LOOKUP_NAME according to NAMECMP to FOUND. */ | |
245 | ||
246 | static void | |
247 | lookup_minimal_symbol_mangled (const char *lookup_name, | |
248 | const char *sfile, | |
249 | struct objfile *objfile, | |
250 | struct minimal_symbol **table, | |
251 | unsigned int hash, | |
252 | int (*namecmp) (const char *, const char *), | |
253 | found_minimal_symbols &found) | |
254 | { | |
255 | for (minimal_symbol *msymbol = table[hash]; | |
256 | msymbol != NULL; | |
257 | msymbol = msymbol->hash_next) | |
258 | { | |
259 | const char *symbol_name = MSYMBOL_LINKAGE_NAME (msymbol); | |
260 | ||
261 | if (namecmp (symbol_name, lookup_name) == 0 | |
262 | && found.maybe_collect (sfile, objfile, msymbol)) | |
263 | return; | |
264 | } | |
265 | } | |
266 | ||
267 | /* Walk the demangled name hash table, and pass each symbol whose name | |
268 | matches LOOKUP_NAME according to MATCHER to FOUND. */ | |
269 | ||
270 | static void | |
271 | lookup_minimal_symbol_demangled (const lookup_name_info &lookup_name, | |
272 | const char *sfile, | |
273 | struct objfile *objfile, | |
274 | struct minimal_symbol **table, | |
275 | unsigned int hash, | |
276 | symbol_name_matcher_ftype *matcher, | |
277 | found_minimal_symbols &found) | |
278 | { | |
279 | for (minimal_symbol *msymbol = table[hash]; | |
280 | msymbol != NULL; | |
281 | msymbol = msymbol->demangled_hash_next) | |
282 | { | |
283 | const char *symbol_name = MSYMBOL_SEARCH_NAME (msymbol); | |
284 | ||
285 | if (matcher (symbol_name, lookup_name, NULL) | |
286 | && found.maybe_collect (sfile, objfile, msymbol)) | |
287 | return; | |
0729fd50 DB |
288 | } |
289 | } | |
290 | ||
c906108c SS |
291 | /* Look through all the current minimal symbol tables and find the |
292 | first minimal symbol that matches NAME. If OBJF is non-NULL, limit | |
72a5efb3 DJ |
293 | the search to that objfile. If SFILE is non-NULL, the only file-scope |
294 | symbols considered will be from that source file (global symbols are | |
295 | still preferred). Returns a pointer to the minimal symbol that | |
c906108c SS |
296 | matches, or NULL if no match is found. |
297 | ||
298 | Note: One instance where there may be duplicate minimal symbols with | |
299 | the same name is when the symbol tables for a shared library and the | |
300 | symbol tables for an executable contain global symbols with the same | |
d73f140a JB |
301 | names (the dynamic linker deals with the duplication). |
302 | ||
303 | It's also possible to have minimal symbols with different mangled | |
304 | names, but identical demangled names. For example, the GNU C++ v3 | |
305 | ABI requires the generation of two (or perhaps three) copies of | |
306 | constructor functions --- "in-charge", "not-in-charge", and | |
307 | "allocate" copies; destructors may be duplicated as well. | |
308 | Obviously, there must be distinct mangled names for each of these, | |
309 | but the demangled names are all the same: S::S or S::~S. */ | |
c906108c | 310 | |
3b7344d5 TT |
311 | struct bound_minimal_symbol |
312 | lookup_minimal_symbol (const char *name, const char *sfile, | |
313 | struct objfile *objf) | |
c906108c SS |
314 | { |
315 | struct objfile *objfile; | |
b5ec771e | 316 | found_minimal_symbols found; |
c906108c | 317 | |
b5ec771e | 318 | unsigned int mangled_hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
9227b5eb | 319 | |
b5ec771e PA |
320 | auto *mangled_cmp |
321 | = (case_sensitivity == case_sensitive_on | |
322 | ? strcmp | |
323 | : strcasecmp); | |
71c25dea | 324 | |
c906108c | 325 | if (sfile != NULL) |
9f37bbcc | 326 | sfile = lbasename (sfile); |
c906108c | 327 | |
b5ec771e | 328 | lookup_name_info lookup_name (name, symbol_name_match_type::FULL); |
71c25dea | 329 | |
c906108c | 330 | for (objfile = object_files; |
b5ec771e | 331 | objfile != NULL && found.external_symbol.minsym == NULL; |
c5aa993b | 332 | objfile = objfile->next) |
c906108c | 333 | { |
56e3f43c | 334 | if (objf == NULL || objf == objfile |
15d123c9 | 335 | || objf == objfile->separate_debug_objfile_backlink) |
c906108c | 336 | { |
b5ec771e PA |
337 | if (symbol_lookup_debug) |
338 | { | |
339 | fprintf_unfiltered (gdb_stdlog, | |
340 | "lookup_minimal_symbol (%s, %s, %s)\n", | |
341 | name, sfile != NULL ? sfile : "NULL", | |
342 | objfile_debug_name (objfile)); | |
343 | } | |
344 | ||
9227b5eb JB |
345 | /* Do two passes: the first over the ordinary hash table, |
346 | and the second over the demangled hash table. */ | |
b5ec771e PA |
347 | lookup_minimal_symbol_mangled (name, sfile, objfile, |
348 | objfile->per_bfd->msymbol_hash, | |
349 | mangled_hash, mangled_cmp, found); | |
cc485e62 | 350 | |
b5ec771e PA |
351 | /* If not found, try the demangled hash table. */ |
352 | if (found.external_symbol.minsym == NULL) | |
c906108c | 353 | { |
b5ec771e PA |
354 | /* Once for each language in the demangled hash names |
355 | table (usually just zero or one languages). */ | |
356 | for (auto lang : objfile->per_bfd->demangled_hash_languages) | |
c906108c | 357 | { |
b5ec771e PA |
358 | unsigned int hash |
359 | = (lookup_name.search_name_hash (lang) | |
360 | % MINIMAL_SYMBOL_HASH_SIZE); | |
361 | ||
362 | symbol_name_matcher_ftype *match | |
618daa93 PA |
363 | = get_symbol_name_matcher (language_def (lang), |
364 | lookup_name); | |
b5ec771e PA |
365 | struct minimal_symbol **msymbol_demangled_hash |
366 | = objfile->per_bfd->msymbol_demangled_hash; | |
367 | ||
368 | lookup_minimal_symbol_demangled (lookup_name, sfile, objfile, | |
369 | msymbol_demangled_hash, | |
370 | hash, match, found); | |
371 | ||
372 | if (found.external_symbol.minsym != NULL) | |
373 | break; | |
9227b5eb | 374 | } |
c906108c SS |
375 | } |
376 | } | |
377 | } | |
71c25dea | 378 | |
c906108c | 379 | /* External symbols are best. */ |
b5ec771e | 380 | if (found.external_symbol.minsym != NULL) |
cc485e62 DE |
381 | { |
382 | if (symbol_lookup_debug) | |
383 | { | |
b5ec771e PA |
384 | minimal_symbol *minsym = found.external_symbol.minsym; |
385 | ||
cc485e62 | 386 | fprintf_unfiltered (gdb_stdlog, |
b5ec771e PA |
387 | "lookup_minimal_symbol (...) = %s (external)\n", |
388 | host_address_to_string (minsym)); | |
cc485e62 | 389 | } |
b5ec771e | 390 | return found.external_symbol; |
cc485e62 | 391 | } |
c906108c SS |
392 | |
393 | /* File-local symbols are next best. */ | |
b5ec771e | 394 | if (found.file_symbol.minsym != NULL) |
cc485e62 DE |
395 | { |
396 | if (symbol_lookup_debug) | |
397 | { | |
b5ec771e PA |
398 | minimal_symbol *minsym = found.file_symbol.minsym; |
399 | ||
cc485e62 | 400 | fprintf_unfiltered (gdb_stdlog, |
b5ec771e PA |
401 | "lookup_minimal_symbol (...) = %s (file-local)\n", |
402 | host_address_to_string (minsym)); | |
cc485e62 | 403 | } |
b5ec771e | 404 | return found.file_symbol; |
cc485e62 | 405 | } |
c906108c SS |
406 | |
407 | /* Symbols for shared library trampolines are next best. */ | |
b5ec771e | 408 | if (found.trampoline_symbol.minsym != NULL) |
cc485e62 | 409 | { |
b5ec771e PA |
410 | if (symbol_lookup_debug) |
411 | { | |
412 | minimal_symbol *minsym = found.trampoline_symbol.minsym; | |
413 | ||
414 | fprintf_unfiltered (gdb_stdlog, | |
415 | "lookup_minimal_symbol (...) = %s (trampoline)\n", | |
416 | host_address_to_string (minsym)); | |
417 | } | |
418 | ||
419 | return found.trampoline_symbol; | |
cc485e62 | 420 | } |
b5ec771e PA |
421 | |
422 | /* Not found. */ | |
423 | if (symbol_lookup_debug) | |
424 | fprintf_unfiltered (gdb_stdlog, "lookup_minimal_symbol (...) = NULL\n"); | |
425 | return {}; | |
7c7b6655 TT |
426 | } |
427 | ||
428 | /* See minsyms.h. */ | |
c906108c | 429 | |
7c7b6655 TT |
430 | struct bound_minimal_symbol |
431 | lookup_bound_minimal_symbol (const char *name) | |
432 | { | |
3b7344d5 | 433 | return lookup_minimal_symbol (name, NULL, NULL); |
c906108c SS |
434 | } |
435 | ||
bd9269f7 GB |
436 | /* See common/symbol.h. */ |
437 | ||
438 | int | |
439 | find_minimal_symbol_address (const char *name, CORE_ADDR *addr, | |
440 | struct objfile *objfile) | |
441 | { | |
442 | struct bound_minimal_symbol sym | |
443 | = lookup_minimal_symbol (name, NULL, objfile); | |
444 | ||
445 | if (sym.minsym != NULL) | |
446 | *addr = BMSYMBOL_VALUE_ADDRESS (sym); | |
447 | ||
448 | return sym.minsym == NULL; | |
449 | } | |
450 | ||
8825213e PA |
451 | /* Get the lookup name form best suitable for linkage name |
452 | matching. */ | |
453 | ||
454 | static const char * | |
455 | linkage_name_str (const lookup_name_info &lookup_name) | |
456 | { | |
457 | /* Unlike most languages (including C++), Ada uses the | |
458 | encoded/linkage name as the search name recorded in symbols. So | |
459 | if debugging in Ada mode, prefer the Ada-encoded name. This also | |
460 | makes Ada's verbatim match syntax ("<...>") work, because | |
461 | "lookup_name.name()" includes the "<>"s, while | |
462 | "lookup_name.ada().lookup_name()" is the encoded name with "<>"s | |
463 | stripped. */ | |
464 | if (current_language->la_language == language_ada) | |
465 | return lookup_name.ada ().lookup_name ().c_str (); | |
466 | ||
467 | return lookup_name.name ().c_str (); | |
468 | } | |
469 | ||
b19686e0 | 470 | /* See minsyms.h. */ |
f8eba3c6 TT |
471 | |
472 | void | |
41c1efc6 TT |
473 | iterate_over_minimal_symbols |
474 | (struct objfile *objf, const lookup_name_info &lookup_name, | |
ca31ab1d | 475 | gdb::function_view<bool (struct minimal_symbol *)> callback) |
f8eba3c6 | 476 | { |
f8eba3c6 | 477 | /* The first pass is over the ordinary hash table. */ |
f8eba3c6 | 478 | { |
8825213e | 479 | const char *name = linkage_name_str (lookup_name); |
b5ec771e PA |
480 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
481 | auto *mangled_cmp | |
482 | = (case_sensitivity == case_sensitive_on | |
483 | ? strcmp | |
484 | : strcasecmp); | |
485 | ||
486 | for (minimal_symbol *iter = objf->per_bfd->msymbol_hash[hash]; | |
487 | iter != NULL; | |
488 | iter = iter->hash_next) | |
489 | { | |
490 | if (mangled_cmp (MSYMBOL_LINKAGE_NAME (iter), name) == 0) | |
ca31ab1d PA |
491 | if (callback (iter)) |
492 | return; | |
b5ec771e | 493 | } |
f8eba3c6 TT |
494 | } |
495 | ||
b5ec771e PA |
496 | /* The second pass is over the demangled table. Once for each |
497 | language in the demangled hash names table (usually just zero or | |
498 | one). */ | |
499 | for (auto lang : objf->per_bfd->demangled_hash_languages) | |
f8eba3c6 | 500 | { |
b5ec771e PA |
501 | const language_defn *lang_def = language_def (lang); |
502 | symbol_name_matcher_ftype *name_match | |
618daa93 | 503 | = get_symbol_name_matcher (lang_def, lookup_name); |
b5ec771e PA |
504 | |
505 | unsigned int hash | |
506 | = lookup_name.search_name_hash (lang) % MINIMAL_SYMBOL_HASH_SIZE; | |
507 | for (minimal_symbol *iter = objf->per_bfd->msymbol_demangled_hash[hash]; | |
508 | iter != NULL; | |
509 | iter = iter->demangled_hash_next) | |
510 | if (name_match (MSYMBOL_SEARCH_NAME (iter), lookup_name, NULL)) | |
ca31ab1d PA |
511 | if (callback (iter)) |
512 | return; | |
f8eba3c6 TT |
513 | } |
514 | } | |
515 | ||
b19686e0 | 516 | /* See minsyms.h. */ |
c5aa993b | 517 | |
3b7344d5 | 518 | struct bound_minimal_symbol |
5520a790 | 519 | lookup_minimal_symbol_text (const char *name, struct objfile *objf) |
c906108c SS |
520 | { |
521 | struct objfile *objfile; | |
522 | struct minimal_symbol *msymbol; | |
3b7344d5 TT |
523 | struct bound_minimal_symbol found_symbol = { NULL, NULL }; |
524 | struct bound_minimal_symbol found_file_symbol = { NULL, NULL }; | |
c906108c | 525 | |
72a5efb3 DJ |
526 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
527 | ||
c906108c | 528 | for (objfile = object_files; |
3b7344d5 | 529 | objfile != NULL && found_symbol.minsym == NULL; |
c5aa993b | 530 | objfile = objfile->next) |
c906108c | 531 | { |
56e3f43c | 532 | if (objf == NULL || objf == objfile |
15d123c9 | 533 | || objf == objfile->separate_debug_objfile_backlink) |
c906108c | 534 | { |
34643a32 | 535 | for (msymbol = objfile->per_bfd->msymbol_hash[hash]; |
3b7344d5 | 536 | msymbol != NULL && found_symbol.minsym == NULL; |
72a5efb3 | 537 | msymbol = msymbol->hash_next) |
c906108c | 538 | { |
efd66ac6 | 539 | if (strcmp (MSYMBOL_LINKAGE_NAME (msymbol), name) == 0 && |
0875794a JK |
540 | (MSYMBOL_TYPE (msymbol) == mst_text |
541 | || MSYMBOL_TYPE (msymbol) == mst_text_gnu_ifunc | |
542 | || MSYMBOL_TYPE (msymbol) == mst_file_text)) | |
c906108c SS |
543 | { |
544 | switch (MSYMBOL_TYPE (msymbol)) | |
545 | { | |
546 | case mst_file_text: | |
3b7344d5 TT |
547 | found_file_symbol.minsym = msymbol; |
548 | found_file_symbol.objfile = objfile; | |
c906108c SS |
549 | break; |
550 | default: | |
3b7344d5 TT |
551 | found_symbol.minsym = msymbol; |
552 | found_symbol.objfile = objfile; | |
c906108c SS |
553 | break; |
554 | } | |
555 | } | |
556 | } | |
557 | } | |
558 | } | |
559 | /* External symbols are best. */ | |
3b7344d5 | 560 | if (found_symbol.minsym) |
c906108c SS |
561 | return found_symbol; |
562 | ||
563 | /* File-local symbols are next best. */ | |
3b7344d5 | 564 | return found_file_symbol; |
c906108c SS |
565 | } |
566 | ||
b19686e0 | 567 | /* See minsyms.h. */ |
907fc202 UW |
568 | |
569 | struct minimal_symbol * | |
570 | lookup_minimal_symbol_by_pc_name (CORE_ADDR pc, const char *name, | |
571 | struct objfile *objf) | |
572 | { | |
573 | struct objfile *objfile; | |
574 | struct minimal_symbol *msymbol; | |
575 | ||
576 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; | |
577 | ||
578 | for (objfile = object_files; | |
579 | objfile != NULL; | |
580 | objfile = objfile->next) | |
581 | { | |
582 | if (objf == NULL || objf == objfile | |
15d123c9 | 583 | || objf == objfile->separate_debug_objfile_backlink) |
907fc202 | 584 | { |
34643a32 | 585 | for (msymbol = objfile->per_bfd->msymbol_hash[hash]; |
907fc202 UW |
586 | msymbol != NULL; |
587 | msymbol = msymbol->hash_next) | |
588 | { | |
77e371c0 | 589 | if (MSYMBOL_VALUE_ADDRESS (objfile, msymbol) == pc |
efd66ac6 | 590 | && strcmp (MSYMBOL_LINKAGE_NAME (msymbol), name) == 0) |
907fc202 UW |
591 | return msymbol; |
592 | } | |
593 | } | |
594 | } | |
595 | ||
596 | return NULL; | |
597 | } | |
598 | ||
b19686e0 | 599 | /* See minsyms.h. */ |
c5aa993b | 600 | |
3b7344d5 | 601 | struct bound_minimal_symbol |
aa1ee363 | 602 | lookup_minimal_symbol_solib_trampoline (const char *name, |
aa1ee363 | 603 | struct objfile *objf) |
c906108c SS |
604 | { |
605 | struct objfile *objfile; | |
606 | struct minimal_symbol *msymbol; | |
3b7344d5 | 607 | struct bound_minimal_symbol found_symbol = { NULL, NULL }; |
c906108c | 608 | |
72a5efb3 DJ |
609 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
610 | ||
c906108c | 611 | for (objfile = object_files; |
3b7344d5 | 612 | objfile != NULL; |
c5aa993b | 613 | objfile = objfile->next) |
c906108c | 614 | { |
56e3f43c | 615 | if (objf == NULL || objf == objfile |
15d123c9 | 616 | || objf == objfile->separate_debug_objfile_backlink) |
c906108c | 617 | { |
34643a32 | 618 | for (msymbol = objfile->per_bfd->msymbol_hash[hash]; |
3b7344d5 | 619 | msymbol != NULL; |
72a5efb3 | 620 | msymbol = msymbol->hash_next) |
c906108c | 621 | { |
efd66ac6 | 622 | if (strcmp (MSYMBOL_LINKAGE_NAME (msymbol), name) == 0 && |
c906108c | 623 | MSYMBOL_TYPE (msymbol) == mst_solib_trampoline) |
3b7344d5 TT |
624 | { |
625 | found_symbol.objfile = objfile; | |
626 | found_symbol.minsym = msymbol; | |
627 | return found_symbol; | |
628 | } | |
c906108c SS |
629 | } |
630 | } | |
631 | } | |
632 | ||
3b7344d5 | 633 | return found_symbol; |
c906108c SS |
634 | } |
635 | ||
77e371c0 TT |
636 | /* A helper function that makes *PC section-relative. This searches |
637 | the sections of OBJFILE and if *PC is in a section, it subtracts | |
638 | the section offset and returns true. Otherwise it returns | |
639 | false. */ | |
640 | ||
641 | static int | |
642 | frob_address (struct objfile *objfile, CORE_ADDR *pc) | |
643 | { | |
644 | struct obj_section *iter; | |
645 | ||
646 | ALL_OBJFILE_OSECTIONS (objfile, iter) | |
647 | { | |
648 | if (*pc >= obj_section_addr (iter) && *pc < obj_section_endaddr (iter)) | |
649 | { | |
650 | *pc -= obj_section_offset (iter); | |
651 | return 1; | |
652 | } | |
653 | } | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
c906108c SS |
658 | /* Search through the minimal symbol table for each objfile and find |
659 | the symbol whose address is the largest address that is still less | |
00878c6e PP |
660 | than or equal to PC, and matches SECTION (which is not NULL). |
661 | Returns a pointer to the minimal symbol if such a symbol is found, | |
662 | or NULL if PC is not in a suitable range. | |
663 | Note that we need to look through ALL the minimal symbol tables | |
664 | before deciding on the symbol that comes closest to the specified PC. | |
665 | This is because objfiles can overlap, for example objfile A has .text | |
666 | at 0x100 and .data at 0x40000 and objfile B has .text at 0x234 and | |
667 | .data at 0x40048. | |
c906108c | 668 | |
2eaf8d2a DJ |
669 | If WANT_TRAMPOLINE is set, prefer mst_solib_trampoline symbols when |
670 | there are text and trampoline symbols at the same address. | |
671 | Otherwise prefer mst_text symbols. */ | |
672 | ||
20944a6e PA |
673 | bound_minimal_symbol |
674 | lookup_minimal_symbol_by_pc_section (CORE_ADDR pc_in, struct obj_section *section, | |
675 | lookup_msym_prefer prefer) | |
c906108c SS |
676 | { |
677 | int lo; | |
678 | int hi; | |
fe978cb0 | 679 | int newobj; |
c906108c SS |
680 | struct objfile *objfile; |
681 | struct minimal_symbol *msymbol; | |
682 | struct minimal_symbol *best_symbol = NULL; | |
7cbd4a93 TT |
683 | struct objfile *best_objfile = NULL; |
684 | struct bound_minimal_symbol result; | |
20944a6e | 685 | enum minimal_symbol_type want_type; |
c906108c | 686 | |
20944a6e PA |
687 | if (section == NULL) |
688 | { | |
689 | section = find_pc_section (pc_in); | |
690 | if (section == NULL) | |
691 | return {}; | |
692 | } | |
693 | ||
694 | switch (prefer) | |
695 | { | |
696 | case lookup_msym_prefer::TEXT: | |
697 | want_type = mst_text; | |
698 | break; | |
699 | case lookup_msym_prefer::TRAMPOLINE: | |
700 | want_type = mst_solib_trampoline; | |
701 | break; | |
702 | case lookup_msym_prefer::GNU_IFUNC: | |
703 | want_type = mst_text_gnu_ifunc; | |
704 | break; | |
705 | } | |
00878c6e PP |
706 | |
707 | /* We can not require the symbol found to be in section, because | |
96225718 DJ |
708 | e.g. IRIX 6.5 mdebug relies on this code returning an absolute |
709 | symbol - but find_pc_section won't return an absolute section and | |
710 | hence the code below would skip over absolute symbols. We can | |
711 | still take advantage of the call to find_pc_section, though - the | |
712 | object file still must match. In case we have separate debug | |
713 | files, search both the file and its separate debug file. There's | |
714 | no telling which one will have the minimal symbols. */ | |
715 | ||
00878c6e | 716 | gdb_assert (section != NULL); |
96225718 | 717 | |
15d123c9 TG |
718 | for (objfile = section->objfile; |
719 | objfile != NULL; | |
720 | objfile = objfile_separate_debug_iterate (section->objfile, objfile)) | |
c906108c | 721 | { |
77e371c0 TT |
722 | CORE_ADDR pc = pc_in; |
723 | ||
c906108c | 724 | /* If this objfile has a minimal symbol table, go search it using |
c5aa993b JM |
725 | a binary search. Note that a minimal symbol table always consists |
726 | of at least two symbols, a "real" symbol and the terminating | |
727 | "null symbol". If there are no real symbols, then there is no | |
025bb325 | 728 | minimal symbol table at all. */ |
c906108c | 729 | |
34643a32 | 730 | if (objfile->per_bfd->minimal_symbol_count > 0) |
c906108c | 731 | { |
29e8a844 DJ |
732 | int best_zero_sized = -1; |
733 | ||
34643a32 | 734 | msymbol = objfile->per_bfd->msymbols; |
c906108c | 735 | lo = 0; |
34643a32 | 736 | hi = objfile->per_bfd->minimal_symbol_count - 1; |
c906108c SS |
737 | |
738 | /* This code assumes that the minimal symbols are sorted by | |
739 | ascending address values. If the pc value is greater than or | |
740 | equal to the first symbol's address, then some symbol in this | |
741 | minimal symbol table is a suitable candidate for being the | |
742 | "best" symbol. This includes the last real symbol, for cases | |
743 | where the pc value is larger than any address in this vector. | |
744 | ||
745 | By iterating until the address associated with the current | |
746 | hi index (the endpoint of the test interval) is less than | |
747 | or equal to the desired pc value, we accomplish two things: | |
748 | (1) the case where the pc value is larger than any minimal | |
749 | symbol address is trivially solved, (2) the address associated | |
750 | with the hi index is always the one we want when the interation | |
751 | terminates. In essence, we are iterating the test interval | |
752 | down until the pc value is pushed out of it from the high end. | |
753 | ||
025bb325 | 754 | Warning: this code is trickier than it would appear at first. */ |
c906108c | 755 | |
77e371c0 TT |
756 | if (frob_address (objfile, &pc) |
757 | && pc >= MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[lo])) | |
c906108c | 758 | { |
77e371c0 | 759 | while (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi]) > pc) |
c906108c | 760 | { |
025bb325 MS |
761 | /* pc is still strictly less than highest address. */ |
762 | /* Note "new" will always be >= lo. */ | |
fe978cb0 PA |
763 | newobj = (lo + hi) / 2; |
764 | if ((MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[newobj]) >= pc) | |
765 | || (lo == newobj)) | |
c906108c | 766 | { |
fe978cb0 | 767 | hi = newobj; |
c906108c SS |
768 | } |
769 | else | |
770 | { | |
fe978cb0 | 771 | lo = newobj; |
c906108c SS |
772 | } |
773 | } | |
774 | ||
775 | /* If we have multiple symbols at the same address, we want | |
c5aa993b JM |
776 | hi to point to the last one. That way we can find the |
777 | right symbol if it has an index greater than hi. */ | |
34643a32 | 778 | while (hi < objfile->per_bfd->minimal_symbol_count - 1 |
77e371c0 TT |
779 | && (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi]) |
780 | == MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi + 1]))) | |
c906108c SS |
781 | hi++; |
782 | ||
29e8a844 DJ |
783 | /* Skip various undesirable symbols. */ |
784 | while (hi >= 0) | |
785 | { | |
786 | /* Skip any absolute symbols. This is apparently | |
787 | what adb and dbx do, and is needed for the CM-5. | |
788 | There are two known possible problems: (1) on | |
789 | ELF, apparently end, edata, etc. are absolute. | |
790 | Not sure ignoring them here is a big deal, but if | |
791 | we want to use them, the fix would go in | |
792 | elfread.c. (2) I think shared library entry | |
793 | points on the NeXT are absolute. If we want | |
794 | special handling for this it probably should be | |
795 | triggered by a special mst_abs_or_lib or some | |
796 | such. */ | |
797 | ||
712f90be | 798 | if (MSYMBOL_TYPE (&msymbol[hi]) == mst_abs) |
29e8a844 DJ |
799 | { |
800 | hi--; | |
801 | continue; | |
802 | } | |
803 | ||
804 | /* If SECTION was specified, skip any symbol from | |
805 | wrong section. */ | |
806 | if (section | |
807 | /* Some types of debug info, such as COFF, | |
808 | don't fill the bfd_section member, so don't | |
809 | throw away symbols on those platforms. */ | |
efd66ac6 | 810 | && MSYMBOL_OBJ_SECTION (objfile, &msymbol[hi]) != NULL |
714835d5 | 811 | && (!matching_obj_sections |
efd66ac6 | 812 | (MSYMBOL_OBJ_SECTION (objfile, &msymbol[hi]), |
e27d198c | 813 | section))) |
29e8a844 DJ |
814 | { |
815 | hi--; | |
816 | continue; | |
817 | } | |
818 | ||
2eaf8d2a DJ |
819 | /* If we are looking for a trampoline and this is a |
820 | text symbol, or the other way around, check the | |
177b42fe | 821 | preceding symbol too. If they are otherwise |
2eaf8d2a DJ |
822 | identical prefer that one. */ |
823 | if (hi > 0 | |
20944a6e | 824 | && MSYMBOL_TYPE (&msymbol[hi]) != want_type |
2eaf8d2a DJ |
825 | && MSYMBOL_TYPE (&msymbol[hi - 1]) == want_type |
826 | && (MSYMBOL_SIZE (&msymbol[hi]) | |
827 | == MSYMBOL_SIZE (&msymbol[hi - 1])) | |
77e371c0 TT |
828 | && (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi]) |
829 | == MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi - 1])) | |
efd66ac6 TT |
830 | && (MSYMBOL_OBJ_SECTION (objfile, &msymbol[hi]) |
831 | == MSYMBOL_OBJ_SECTION (objfile, &msymbol[hi - 1]))) | |
2eaf8d2a DJ |
832 | { |
833 | hi--; | |
834 | continue; | |
835 | } | |
836 | ||
29e8a844 DJ |
837 | /* If the minimal symbol has a zero size, save it |
838 | but keep scanning backwards looking for one with | |
839 | a non-zero size. A zero size may mean that the | |
840 | symbol isn't an object or function (e.g. a | |
841 | label), or it may just mean that the size was not | |
842 | specified. */ | |
5506f9f6 | 843 | if (MSYMBOL_SIZE (&msymbol[hi]) == 0) |
29e8a844 | 844 | { |
5506f9f6 KB |
845 | if (best_zero_sized == -1) |
846 | best_zero_sized = hi; | |
29e8a844 DJ |
847 | hi--; |
848 | continue; | |
849 | } | |
850 | ||
f7a6bb70 DJ |
851 | /* If we are past the end of the current symbol, try |
852 | the previous symbol if it has a larger overlapping | |
853 | size. This happens on i686-pc-linux-gnu with glibc; | |
854 | the nocancel variants of system calls are inside | |
855 | the cancellable variants, but both have sizes. */ | |
856 | if (hi > 0 | |
857 | && MSYMBOL_SIZE (&msymbol[hi]) != 0 | |
77e371c0 | 858 | && pc >= (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi]) |
f7a6bb70 | 859 | + MSYMBOL_SIZE (&msymbol[hi])) |
77e371c0 | 860 | && pc < (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi - 1]) |
f7a6bb70 DJ |
861 | + MSYMBOL_SIZE (&msymbol[hi - 1]))) |
862 | { | |
863 | hi--; | |
864 | continue; | |
865 | } | |
866 | ||
29e8a844 DJ |
867 | /* Otherwise, this symbol must be as good as we're going |
868 | to get. */ | |
869 | break; | |
870 | } | |
871 | ||
872 | /* If HI has a zero size, and best_zero_sized is set, | |
873 | then we had two or more zero-sized symbols; prefer | |
874 | the first one we found (which may have a higher | |
875 | address). Also, if we ran off the end, be sure | |
876 | to back up. */ | |
877 | if (best_zero_sized != -1 | |
878 | && (hi < 0 || MSYMBOL_SIZE (&msymbol[hi]) == 0)) | |
879 | hi = best_zero_sized; | |
880 | ||
881 | /* If the minimal symbol has a non-zero size, and this | |
882 | PC appears to be outside the symbol's contents, then | |
883 | refuse to use this symbol. If we found a zero-sized | |
884 | symbol with an address greater than this symbol's, | |
885 | use that instead. We assume that if symbols have | |
886 | specified sizes, they do not overlap. */ | |
887 | ||
888 | if (hi >= 0 | |
889 | && MSYMBOL_SIZE (&msymbol[hi]) != 0 | |
77e371c0 | 890 | && pc >= (MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi]) |
29e8a844 DJ |
891 | + MSYMBOL_SIZE (&msymbol[hi]))) |
892 | { | |
893 | if (best_zero_sized != -1) | |
894 | hi = best_zero_sized; | |
895 | else | |
896 | /* Go on to the next object file. */ | |
897 | continue; | |
898 | } | |
899 | ||
c906108c | 900 | /* The minimal symbol indexed by hi now is the best one in this |
c5aa993b | 901 | objfile's minimal symbol table. See if it is the best one |
025bb325 | 902 | overall. */ |
c906108c | 903 | |
c906108c SS |
904 | if (hi >= 0 |
905 | && ((best_symbol == NULL) || | |
77e371c0 TT |
906 | (MSYMBOL_VALUE_RAW_ADDRESS (best_symbol) < |
907 | MSYMBOL_VALUE_RAW_ADDRESS (&msymbol[hi])))) | |
c906108c SS |
908 | { |
909 | best_symbol = &msymbol[hi]; | |
7cbd4a93 | 910 | best_objfile = objfile; |
c906108c SS |
911 | } |
912 | } | |
913 | } | |
914 | } | |
7cbd4a93 TT |
915 | |
916 | result.minsym = best_symbol; | |
917 | result.objfile = best_objfile; | |
918 | return result; | |
c906108c SS |
919 | } |
920 | ||
b19686e0 | 921 | /* See minsyms.h. */ |
c906108c | 922 | |
7cbd4a93 | 923 | struct bound_minimal_symbol |
fba45db2 | 924 | lookup_minimal_symbol_by_pc (CORE_ADDR pc) |
c906108c | 925 | { |
20944a6e | 926 | return lookup_minimal_symbol_by_pc_section (pc, NULL); |
c906108c | 927 | } |
0d5392b8 | 928 | |
0875794a JK |
929 | /* Return non-zero iff PC is in an STT_GNU_IFUNC function resolver. */ |
930 | ||
931 | int | |
932 | in_gnu_ifunc_stub (CORE_ADDR pc) | |
933 | { | |
20944a6e PA |
934 | bound_minimal_symbol msymbol |
935 | = lookup_minimal_symbol_by_pc_section (pc, NULL, | |
936 | lookup_msym_prefer::GNU_IFUNC); | |
7cbd4a93 | 937 | return msymbol.minsym && MSYMBOL_TYPE (msymbol.minsym) == mst_text_gnu_ifunc; |
0875794a JK |
938 | } |
939 | ||
07be84bf JK |
940 | /* See elf_gnu_ifunc_resolve_addr for its real implementation. */ |
941 | ||
942 | static CORE_ADDR | |
943 | stub_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
944 | { | |
945 | error (_("GDB cannot resolve STT_GNU_IFUNC symbol at address %s without " | |
946 | "the ELF support compiled in."), | |
947 | paddress (gdbarch, pc)); | |
948 | } | |
949 | ||
950 | /* See elf_gnu_ifunc_resolve_name for its real implementation. */ | |
951 | ||
952 | static int | |
953 | stub_gnu_ifunc_resolve_name (const char *function_name, | |
954 | CORE_ADDR *function_address_p) | |
955 | { | |
956 | error (_("GDB cannot resolve STT_GNU_IFUNC symbol \"%s\" without " | |
957 | "the ELF support compiled in."), | |
958 | function_name); | |
959 | } | |
960 | ||
0e30163f JK |
961 | /* See elf_gnu_ifunc_resolver_stop for its real implementation. */ |
962 | ||
963 | static void | |
964 | stub_gnu_ifunc_resolver_stop (struct breakpoint *b) | |
965 | { | |
966 | internal_error (__FILE__, __LINE__, | |
967 | _("elf_gnu_ifunc_resolver_stop cannot be reached.")); | |
968 | } | |
969 | ||
970 | /* See elf_gnu_ifunc_resolver_return_stop for its real implementation. */ | |
971 | ||
972 | static void | |
973 | stub_gnu_ifunc_resolver_return_stop (struct breakpoint *b) | |
974 | { | |
975 | internal_error (__FILE__, __LINE__, | |
976 | _("elf_gnu_ifunc_resolver_return_stop cannot be reached.")); | |
977 | } | |
978 | ||
07be84bf JK |
979 | /* See elf_gnu_ifunc_fns for its real implementation. */ |
980 | ||
981 | static const struct gnu_ifunc_fns stub_gnu_ifunc_fns = | |
982 | { | |
983 | stub_gnu_ifunc_resolve_addr, | |
984 | stub_gnu_ifunc_resolve_name, | |
0e30163f JK |
985 | stub_gnu_ifunc_resolver_stop, |
986 | stub_gnu_ifunc_resolver_return_stop, | |
07be84bf JK |
987 | }; |
988 | ||
989 | /* A placeholder for &elf_gnu_ifunc_fns. */ | |
990 | ||
991 | const struct gnu_ifunc_fns *gnu_ifunc_fns_p = &stub_gnu_ifunc_fns; | |
992 | ||
c906108c | 993 | \f |
c5aa993b | 994 | |
025bb325 | 995 | /* Return leading symbol character for a BFD. If BFD is NULL, |
c906108c SS |
996 | return the leading symbol character from the main objfile. */ |
997 | ||
c906108c | 998 | static int |
fba45db2 | 999 | get_symbol_leading_char (bfd *abfd) |
c906108c SS |
1000 | { |
1001 | if (abfd != NULL) | |
1002 | return bfd_get_symbol_leading_char (abfd); | |
1003 | if (symfile_objfile != NULL && symfile_objfile->obfd != NULL) | |
1004 | return bfd_get_symbol_leading_char (symfile_objfile->obfd); | |
1005 | return 0; | |
1006 | } | |
1007 | ||
b19686e0 | 1008 | /* See minsyms.h. */ |
c906108c | 1009 | |
d25e8719 | 1010 | minimal_symbol_reader::minimal_symbol_reader (struct objfile *obj) |
8dddcb8f TT |
1011 | : m_objfile (obj), |
1012 | m_msym_bunch (NULL), | |
1013 | /* Note that presetting m_msym_bunch_index to BUNCH_SIZE causes the | |
b19686e0 TT |
1014 | first call to save a minimal symbol to allocate the memory for |
1015 | the first bunch. */ | |
8dddcb8f TT |
1016 | m_msym_bunch_index (BUNCH_SIZE), |
1017 | m_msym_count (0) | |
1018 | { | |
c906108c SS |
1019 | } |
1020 | ||
873a915e TT |
1021 | /* Discard the currently collected minimal symbols, if any. If we wish |
1022 | to save them for later use, we must have already copied them somewhere | |
1023 | else before calling this function. | |
1024 | ||
1025 | FIXME: We could allocate the minimal symbol bunches on their own | |
1026 | obstack and then simply blow the obstack away when we are done with | |
1027 | it. Is it worth the extra trouble though? */ | |
1028 | ||
1029 | minimal_symbol_reader::~minimal_symbol_reader () | |
1030 | { | |
1031 | struct msym_bunch *next; | |
1032 | ||
8dddcb8f | 1033 | while (m_msym_bunch != NULL) |
873a915e | 1034 | { |
8dddcb8f TT |
1035 | next = m_msym_bunch->next; |
1036 | xfree (m_msym_bunch); | |
1037 | m_msym_bunch = next; | |
873a915e TT |
1038 | } |
1039 | } | |
1040 | ||
b19686e0 TT |
1041 | /* See minsyms.h. */ |
1042 | ||
c906108c | 1043 | void |
8dddcb8f | 1044 | minimal_symbol_reader::record (const char *name, CORE_ADDR address, |
ce6c454e | 1045 | enum minimal_symbol_type ms_type) |
c906108c SS |
1046 | { |
1047 | int section; | |
1048 | ||
1049 | switch (ms_type) | |
1050 | { | |
1051 | case mst_text: | |
0875794a | 1052 | case mst_text_gnu_ifunc: |
c906108c SS |
1053 | case mst_file_text: |
1054 | case mst_solib_trampoline: | |
8dddcb8f | 1055 | section = SECT_OFF_TEXT (m_objfile); |
c906108c SS |
1056 | break; |
1057 | case mst_data: | |
f50776aa | 1058 | case mst_data_gnu_ifunc: |
c906108c | 1059 | case mst_file_data: |
8dddcb8f | 1060 | section = SECT_OFF_DATA (m_objfile); |
c906108c SS |
1061 | break; |
1062 | case mst_bss: | |
1063 | case mst_file_bss: | |
8dddcb8f | 1064 | section = SECT_OFF_BSS (m_objfile); |
c906108c SS |
1065 | break; |
1066 | default: | |
1067 | section = -1; | |
1068 | } | |
1069 | ||
8dddcb8f | 1070 | record_with_info (name, address, ms_type, section); |
c906108c SS |
1071 | } |
1072 | ||
b19686e0 | 1073 | /* See minsyms.h. */ |
c906108c SS |
1074 | |
1075 | struct minimal_symbol * | |
8dddcb8f | 1076 | minimal_symbol_reader::record_full (const char *name, int name_len, |
ce6c454e TT |
1077 | bool copy_name, CORE_ADDR address, |
1078 | enum minimal_symbol_type ms_type, | |
1079 | int section) | |
c906108c | 1080 | { |
fe978cb0 | 1081 | struct msym_bunch *newobj; |
52f0bd74 | 1082 | struct minimal_symbol *msymbol; |
c906108c | 1083 | |
66337bb1 CV |
1084 | /* Don't put gcc_compiled, __gnu_compiled_cplus, and friends into |
1085 | the minimal symbols, because if there is also another symbol | |
1086 | at the same address (e.g. the first function of the file), | |
1087 | lookup_minimal_symbol_by_pc would have no way of getting the | |
1088 | right one. */ | |
1089 | if (ms_type == mst_file_text && name[0] == 'g' | |
1090 | && (strcmp (name, GCC_COMPILED_FLAG_SYMBOL) == 0 | |
1091 | || strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0)) | |
1092 | return (NULL); | |
1093 | ||
1094 | /* It's safe to strip the leading char here once, since the name | |
025bb325 | 1095 | is also stored stripped in the minimal symbol table. */ |
8dddcb8f | 1096 | if (name[0] == get_symbol_leading_char (m_objfile->obfd)) |
04a679b8 TT |
1097 | { |
1098 | ++name; | |
1099 | --name_len; | |
1100 | } | |
66337bb1 | 1101 | |
61012eef | 1102 | if (ms_type == mst_file_text && startswith (name, "__gnu_compiled")) |
66337bb1 | 1103 | return (NULL); |
c906108c | 1104 | |
8dddcb8f | 1105 | if (m_msym_bunch_index == BUNCH_SIZE) |
c906108c | 1106 | { |
fe978cb0 | 1107 | newobj = XCNEW (struct msym_bunch); |
8dddcb8f TT |
1108 | m_msym_bunch_index = 0; |
1109 | newobj->next = m_msym_bunch; | |
1110 | m_msym_bunch = newobj; | |
c906108c | 1111 | } |
8dddcb8f | 1112 | msymbol = &m_msym_bunch->contents[m_msym_bunch_index]; |
34643a32 | 1113 | MSYMBOL_SET_LANGUAGE (msymbol, language_auto, |
8dddcb8f TT |
1114 | &m_objfile->per_bfd->storage_obstack); |
1115 | MSYMBOL_SET_NAMES (msymbol, name, name_len, copy_name, m_objfile); | |
2de7ced7 | 1116 | |
40c1a007 | 1117 | SET_MSYMBOL_VALUE_ADDRESS (msymbol, address); |
efd66ac6 | 1118 | MSYMBOL_SECTION (msymbol) = section; |
714835d5 | 1119 | |
c906108c | 1120 | MSYMBOL_TYPE (msymbol) = ms_type; |
b887350f TT |
1121 | MSYMBOL_TARGET_FLAG_1 (msymbol) = 0; |
1122 | MSYMBOL_TARGET_FLAG_2 (msymbol) = 0; | |
d9eaeb59 JB |
1123 | /* Do not use the SET_MSYMBOL_SIZE macro to initialize the size, |
1124 | as it would also set the has_size flag. */ | |
1125 | msymbol->size = 0; | |
9227b5eb | 1126 | |
a79dea61 | 1127 | /* The hash pointers must be cleared! If they're not, |
025bb325 | 1128 | add_minsym_to_hash_table will NOT add this msymbol to the hash table. */ |
9227b5eb JB |
1129 | msymbol->hash_next = NULL; |
1130 | msymbol->demangled_hash_next = NULL; | |
1131 | ||
34643a32 TT |
1132 | /* If we already read minimal symbols for this objfile, then don't |
1133 | ever allocate a new one. */ | |
8dddcb8f | 1134 | if (!m_objfile->per_bfd->minsyms_read) |
5f6cac40 | 1135 | { |
8dddcb8f TT |
1136 | m_msym_bunch_index++; |
1137 | m_objfile->per_bfd->n_minsyms++; | |
5f6cac40 | 1138 | } |
8dddcb8f | 1139 | m_msym_count++; |
c906108c SS |
1140 | return msymbol; |
1141 | } | |
1142 | ||
1143 | /* Compare two minimal symbols by address and return a signed result based | |
025bb325 | 1144 | on unsigned comparisons, so that we sort into unsigned numeric order. |
c906108c SS |
1145 | Within groups with the same address, sort by name. */ |
1146 | ||
1147 | static int | |
12b9c64f | 1148 | compare_minimal_symbols (const void *fn1p, const void *fn2p) |
c906108c | 1149 | { |
52f0bd74 AC |
1150 | const struct minimal_symbol *fn1; |
1151 | const struct minimal_symbol *fn2; | |
c906108c SS |
1152 | |
1153 | fn1 = (const struct minimal_symbol *) fn1p; | |
1154 | fn2 = (const struct minimal_symbol *) fn2p; | |
1155 | ||
77e371c0 | 1156 | if (MSYMBOL_VALUE_RAW_ADDRESS (fn1) < MSYMBOL_VALUE_RAW_ADDRESS (fn2)) |
c906108c | 1157 | { |
025bb325 | 1158 | return (-1); /* addr 1 is less than addr 2. */ |
c906108c | 1159 | } |
77e371c0 | 1160 | else if (MSYMBOL_VALUE_RAW_ADDRESS (fn1) > MSYMBOL_VALUE_RAW_ADDRESS (fn2)) |
c906108c | 1161 | { |
025bb325 | 1162 | return (1); /* addr 1 is greater than addr 2. */ |
c906108c | 1163 | } |
c5aa993b JM |
1164 | else |
1165 | /* addrs are equal: sort by name */ | |
c906108c | 1166 | { |
efd66ac6 TT |
1167 | const char *name1 = MSYMBOL_LINKAGE_NAME (fn1); |
1168 | const char *name2 = MSYMBOL_LINKAGE_NAME (fn2); | |
c906108c SS |
1169 | |
1170 | if (name1 && name2) /* both have names */ | |
1171 | return strcmp (name1, name2); | |
1172 | else if (name2) | |
025bb325 MS |
1173 | return 1; /* fn1 has no name, so it is "less". */ |
1174 | else if (name1) /* fn2 has no name, so it is "less". */ | |
c906108c SS |
1175 | return -1; |
1176 | else | |
025bb325 | 1177 | return (0); /* Neither has a name, so they're equal. */ |
c906108c SS |
1178 | } |
1179 | } | |
1180 | ||
c906108c SS |
1181 | /* Compact duplicate entries out of a minimal symbol table by walking |
1182 | through the table and compacting out entries with duplicate addresses | |
1183 | and matching names. Return the number of entries remaining. | |
1184 | ||
1185 | On entry, the table resides between msymbol[0] and msymbol[mcount]. | |
1186 | On exit, it resides between msymbol[0] and msymbol[result_count]. | |
1187 | ||
1188 | When files contain multiple sources of symbol information, it is | |
1189 | possible for the minimal symbol table to contain many duplicate entries. | |
1190 | As an example, SVR4 systems use ELF formatted object files, which | |
1191 | usually contain at least two different types of symbol tables (a | |
1192 | standard ELF one and a smaller dynamic linking table), as well as | |
1193 | DWARF debugging information for files compiled with -g. | |
1194 | ||
1195 | Without compacting, the minimal symbol table for gdb itself contains | |
1196 | over a 1000 duplicates, about a third of the total table size. Aside | |
1197 | from the potential trap of not noticing that two successive entries | |
1198 | identify the same location, this duplication impacts the time required | |
1199 | to linearly scan the table, which is done in a number of places. So we | |
1200 | just do one linear scan here and toss out the duplicates. | |
1201 | ||
1202 | Note that we are not concerned here about recovering the space that | |
1203 | is potentially freed up, because the strings themselves are allocated | |
34643a32 | 1204 | on the storage_obstack, and will get automatically freed when the symbol |
c906108c SS |
1205 | table is freed. The caller can free up the unused minimal symbols at |
1206 | the end of the compacted region if their allocation strategy allows it. | |
1207 | ||
1208 | Also note we only go up to the next to last entry within the loop | |
1209 | and then copy the last entry explicitly after the loop terminates. | |
1210 | ||
1211 | Since the different sources of information for each symbol may | |
1212 | have different levels of "completeness", we may have duplicates | |
1213 | that have one entry with type "mst_unknown" and the other with a | |
1214 | known type. So if the one we are leaving alone has type mst_unknown, | |
1215 | overwrite its type with the type from the one we are compacting out. */ | |
1216 | ||
1217 | static int | |
fba45db2 KB |
1218 | compact_minimal_symbols (struct minimal_symbol *msymbol, int mcount, |
1219 | struct objfile *objfile) | |
c906108c SS |
1220 | { |
1221 | struct minimal_symbol *copyfrom; | |
1222 | struct minimal_symbol *copyto; | |
1223 | ||
1224 | if (mcount > 0) | |
1225 | { | |
1226 | copyfrom = copyto = msymbol; | |
1227 | while (copyfrom < msymbol + mcount - 1) | |
1228 | { | |
77e371c0 TT |
1229 | if (MSYMBOL_VALUE_RAW_ADDRESS (copyfrom) |
1230 | == MSYMBOL_VALUE_RAW_ADDRESS ((copyfrom + 1)) | |
1231 | && MSYMBOL_SECTION (copyfrom) == MSYMBOL_SECTION (copyfrom + 1) | |
efd66ac6 TT |
1232 | && strcmp (MSYMBOL_LINKAGE_NAME (copyfrom), |
1233 | MSYMBOL_LINKAGE_NAME ((copyfrom + 1))) == 0) | |
c906108c | 1234 | { |
c5aa993b | 1235 | if (MSYMBOL_TYPE ((copyfrom + 1)) == mst_unknown) |
c906108c SS |
1236 | { |
1237 | MSYMBOL_TYPE ((copyfrom + 1)) = MSYMBOL_TYPE (copyfrom); | |
1238 | } | |
1239 | copyfrom++; | |
1240 | } | |
1241 | else | |
afbb8d7a | 1242 | *copyto++ = *copyfrom++; |
c906108c SS |
1243 | } |
1244 | *copyto++ = *copyfrom++; | |
1245 | mcount = copyto - msymbol; | |
1246 | } | |
1247 | return (mcount); | |
1248 | } | |
1249 | ||
afbb8d7a KB |
1250 | /* Build (or rebuild) the minimal symbol hash tables. This is necessary |
1251 | after compacting or sorting the table since the entries move around | |
025bb325 | 1252 | thus causing the internal minimal_symbol pointers to become jumbled. */ |
afbb8d7a KB |
1253 | |
1254 | static void | |
1255 | build_minimal_symbol_hash_tables (struct objfile *objfile) | |
1256 | { | |
1257 | int i; | |
1258 | struct minimal_symbol *msym; | |
1259 | ||
025bb325 | 1260 | /* Clear the hash tables. */ |
afbb8d7a KB |
1261 | for (i = 0; i < MINIMAL_SYMBOL_HASH_SIZE; i++) |
1262 | { | |
34643a32 TT |
1263 | objfile->per_bfd->msymbol_hash[i] = 0; |
1264 | objfile->per_bfd->msymbol_demangled_hash[i] = 0; | |
afbb8d7a KB |
1265 | } |
1266 | ||
025bb325 | 1267 | /* Now, (re)insert the actual entries. */ |
34643a32 TT |
1268 | for ((i = objfile->per_bfd->minimal_symbol_count, |
1269 | msym = objfile->per_bfd->msymbols); | |
afbb8d7a KB |
1270 | i > 0; |
1271 | i--, msym++) | |
1272 | { | |
1273 | msym->hash_next = 0; | |
34643a32 | 1274 | add_minsym_to_hash_table (msym, objfile->per_bfd->msymbol_hash); |
afbb8d7a KB |
1275 | |
1276 | msym->demangled_hash_next = 0; | |
efd66ac6 | 1277 | if (MSYMBOL_SEARCH_NAME (msym) != MSYMBOL_LINKAGE_NAME (msym)) |
b5ec771e | 1278 | add_minsym_to_demangled_hash_table (msym, objfile); |
afbb8d7a KB |
1279 | } |
1280 | } | |
1281 | ||
c906108c SS |
1282 | /* Add the minimal symbols in the existing bunches to the objfile's official |
1283 | minimal symbol table. In most cases there is no minimal symbol table yet | |
1284 | for this objfile, and the existing bunches are used to create one. Once | |
1285 | in a while (for shared libraries for example), we add symbols (e.g. common | |
1286 | symbols) to an existing objfile. | |
1287 | ||
1288 | Because of the way minimal symbols are collected, we generally have no way | |
1289 | of knowing what source language applies to any particular minimal symbol. | |
1290 | Specifically, we have no way of knowing if the minimal symbol comes from a | |
1291 | C++ compilation unit or not. So for the sake of supporting cached | |
1292 | demangled C++ names, we have no choice but to try and demangle each new one | |
1293 | that comes in. If the demangling succeeds, then we assume it is a C++ | |
1294 | symbol and set the symbol's language and demangled name fields | |
1295 | appropriately. Note that in order to avoid unnecessary demanglings, and | |
1296 | allocating obstack space that subsequently can't be freed for the demangled | |
1297 | names, we mark all newly added symbols with language_auto. After | |
1298 | compaction of the minimal symbols, we go back and scan the entire minimal | |
1299 | symbol table looking for these new symbols. For each new symbol we attempt | |
1300 | to demangle it, and if successful, record it as a language_cplus symbol | |
1301 | and cache the demangled form on the symbol obstack. Symbols which don't | |
1302 | demangle are marked as language_unknown symbols, which inhibits future | |
025bb325 | 1303 | attempts to demangle them if we later add more minimal symbols. */ |
c906108c SS |
1304 | |
1305 | void | |
d25e8719 | 1306 | minimal_symbol_reader::install () |
c906108c | 1307 | { |
52f0bd74 AC |
1308 | int bindex; |
1309 | int mcount; | |
1310 | struct msym_bunch *bunch; | |
1311 | struct minimal_symbol *msymbols; | |
c906108c | 1312 | int alloc_count; |
c906108c | 1313 | |
d25e8719 | 1314 | if (m_objfile->per_bfd->minsyms_read) |
34643a32 TT |
1315 | return; |
1316 | ||
8dddcb8f | 1317 | if (m_msym_count > 0) |
c906108c | 1318 | { |
45cfd468 DE |
1319 | if (symtab_create_debug) |
1320 | { | |
1321 | fprintf_unfiltered (gdb_stdlog, | |
1322 | "Installing %d minimal symbols of objfile %s.\n", | |
8dddcb8f | 1323 | m_msym_count, objfile_name (m_objfile)); |
45cfd468 DE |
1324 | } |
1325 | ||
c906108c | 1326 | /* Allocate enough space in the obstack, into which we will gather the |
c5aa993b JM |
1327 | bunches of new and existing minimal symbols, sort them, and then |
1328 | compact out the duplicate entries. Once we have a final table, | |
1329 | we will give back the excess space. */ | |
c906108c | 1330 | |
8dddcb8f | 1331 | alloc_count = m_msym_count + m_objfile->per_bfd->minimal_symbol_count + 1; |
d25e8719 | 1332 | obstack_blank (&m_objfile->per_bfd->storage_obstack, |
c906108c SS |
1333 | alloc_count * sizeof (struct minimal_symbol)); |
1334 | msymbols = (struct minimal_symbol *) | |
d25e8719 | 1335 | obstack_base (&m_objfile->per_bfd->storage_obstack); |
c906108c SS |
1336 | |
1337 | /* Copy in the existing minimal symbols, if there are any. */ | |
1338 | ||
d25e8719 TT |
1339 | if (m_objfile->per_bfd->minimal_symbol_count) |
1340 | memcpy ((char *) msymbols, (char *) m_objfile->per_bfd->msymbols, | |
1341 | m_objfile->per_bfd->minimal_symbol_count * sizeof (struct minimal_symbol)); | |
c906108c SS |
1342 | |
1343 | /* Walk through the list of minimal symbol bunches, adding each symbol | |
c5aa993b JM |
1344 | to the new contiguous array of symbols. Note that we start with the |
1345 | current, possibly partially filled bunch (thus we use the current | |
1346 | msym_bunch_index for the first bunch we copy over), and thereafter | |
025bb325 | 1347 | each bunch is full. */ |
c5aa993b | 1348 | |
d25e8719 | 1349 | mcount = m_objfile->per_bfd->minimal_symbol_count; |
c5aa993b | 1350 | |
8dddcb8f | 1351 | for (bunch = m_msym_bunch; bunch != NULL; bunch = bunch->next) |
c906108c | 1352 | { |
8dddcb8f | 1353 | for (bindex = 0; bindex < m_msym_bunch_index; bindex++, mcount++) |
66337bb1 | 1354 | msymbols[mcount] = bunch->contents[bindex]; |
8dddcb8f | 1355 | m_msym_bunch_index = BUNCH_SIZE; |
c906108c SS |
1356 | } |
1357 | ||
1358 | /* Sort the minimal symbols by address. */ | |
c5aa993b | 1359 | |
c906108c SS |
1360 | qsort (msymbols, mcount, sizeof (struct minimal_symbol), |
1361 | compare_minimal_symbols); | |
c5aa993b | 1362 | |
c906108c | 1363 | /* Compact out any duplicates, and free up whatever space we are |
c5aa993b JM |
1364 | no longer using. */ |
1365 | ||
d25e8719 | 1366 | mcount = compact_minimal_symbols (msymbols, mcount, m_objfile); |
c906108c | 1367 | |
d25e8719 | 1368 | obstack_blank_fast (&m_objfile->per_bfd->storage_obstack, |
c5aa993b | 1369 | (mcount + 1 - alloc_count) * sizeof (struct minimal_symbol)); |
c906108c | 1370 | msymbols = (struct minimal_symbol *) |
d25e8719 | 1371 | obstack_finish (&m_objfile->per_bfd->storage_obstack); |
c906108c SS |
1372 | |
1373 | /* We also terminate the minimal symbol table with a "null symbol", | |
c5aa993b JM |
1374 | which is *not* included in the size of the table. This makes it |
1375 | easier to find the end of the table when we are handed a pointer | |
1376 | to some symbol in the middle of it. Zero out the fields in the | |
1377 | "null symbol" allocated at the end of the array. Note that the | |
1378 | symbol count does *not* include this null symbol, which is why it | |
025bb325 | 1379 | is indexed by mcount and not mcount-1. */ |
c906108c | 1380 | |
a83e9154 | 1381 | memset (&msymbols[mcount], 0, sizeof (struct minimal_symbol)); |
c906108c SS |
1382 | |
1383 | /* Attach the minimal symbol table to the specified objfile. | |
34643a32 | 1384 | The strings themselves are also located in the storage_obstack |
c5aa993b | 1385 | of this objfile. */ |
c906108c | 1386 | |
d25e8719 TT |
1387 | m_objfile->per_bfd->minimal_symbol_count = mcount; |
1388 | m_objfile->per_bfd->msymbols = msymbols; | |
c906108c | 1389 | |
afbb8d7a KB |
1390 | /* Now build the hash tables; we can't do this incrementally |
1391 | at an earlier point since we weren't finished with the obstack | |
1392 | yet. (And if the msymbol obstack gets moved, all the internal | |
025bb325 | 1393 | pointers to other msymbols need to be adjusted.) */ |
d25e8719 | 1394 | build_minimal_symbol_hash_tables (m_objfile); |
c906108c SS |
1395 | } |
1396 | } | |
1397 | ||
c35384fb TT |
1398 | /* See minsyms.h. */ |
1399 | ||
1400 | void | |
1401 | terminate_minimal_symbol_table (struct objfile *objfile) | |
1402 | { | |
34643a32 | 1403 | if (! objfile->per_bfd->msymbols) |
e39db4db SM |
1404 | objfile->per_bfd->msymbols = XOBNEW (&objfile->per_bfd->storage_obstack, |
1405 | minimal_symbol); | |
c35384fb TT |
1406 | |
1407 | { | |
1408 | struct minimal_symbol *m | |
34643a32 | 1409 | = &objfile->per_bfd->msymbols[objfile->per_bfd->minimal_symbol_count]; |
c35384fb TT |
1410 | |
1411 | memset (m, 0, sizeof (*m)); | |
1412 | /* Don't rely on these enumeration values being 0's. */ | |
1413 | MSYMBOL_TYPE (m) = mst_unknown; | |
34643a32 TT |
1414 | MSYMBOL_SET_LANGUAGE (m, language_unknown, |
1415 | &objfile->per_bfd->storage_obstack); | |
c35384fb TT |
1416 | } |
1417 | } | |
1418 | ||
c9630d9c TT |
1419 | /* Check if PC is in a shared library trampoline code stub. |
1420 | Return minimal symbol for the trampoline entry or NULL if PC is not | |
1421 | in a trampoline code stub. */ | |
c906108c | 1422 | |
c9630d9c | 1423 | static struct minimal_symbol * |
fba45db2 | 1424 | lookup_solib_trampoline_symbol_by_pc (CORE_ADDR pc) |
c906108c | 1425 | { |
20944a6e PA |
1426 | bound_minimal_symbol msymbol |
1427 | = lookup_minimal_symbol_by_pc_section (pc, NULL, | |
1428 | lookup_msym_prefer::TRAMPOLINE); | |
c906108c | 1429 | |
7cbd4a93 TT |
1430 | if (msymbol.minsym != NULL |
1431 | && MSYMBOL_TYPE (msymbol.minsym) == mst_solib_trampoline) | |
1432 | return msymbol.minsym; | |
c906108c SS |
1433 | return NULL; |
1434 | } | |
1435 | ||
1436 | /* If PC is in a shared library trampoline code stub, return the | |
1437 | address of the `real' function belonging to the stub. | |
1438 | Return 0 if PC is not in a trampoline code stub or if the real | |
1439 | function is not found in the minimal symbol table. | |
1440 | ||
1441 | We may fail to find the right function if a function with the | |
1442 | same name is defined in more than one shared library, but this | |
025bb325 | 1443 | is considered bad programming style. We could return 0 if we find |
c906108c SS |
1444 | a duplicate function in case this matters someday. */ |
1445 | ||
1446 | CORE_ADDR | |
52f729a7 | 1447 | find_solib_trampoline_target (struct frame_info *frame, CORE_ADDR pc) |
c906108c SS |
1448 | { |
1449 | struct objfile *objfile; | |
1450 | struct minimal_symbol *msymbol; | |
1451 | struct minimal_symbol *tsymbol = lookup_solib_trampoline_symbol_by_pc (pc); | |
1452 | ||
1453 | if (tsymbol != NULL) | |
1454 | { | |
1455 | ALL_MSYMBOLS (objfile, msymbol) | |
c5aa993b | 1456 | { |
42848c96 | 1457 | /* Also handle minimal symbols pointing to function descriptors. */ |
f50776aa PA |
1458 | if ((MSYMBOL_TYPE (msymbol) == mst_text |
1459 | || MSYMBOL_TYPE (msymbol) == mst_text_gnu_ifunc | |
1460 | || MSYMBOL_TYPE (msymbol) == mst_data | |
1461 | || MSYMBOL_TYPE (msymbol) == mst_data_gnu_ifunc) | |
efd66ac6 TT |
1462 | && strcmp (MSYMBOL_LINKAGE_NAME (msymbol), |
1463 | MSYMBOL_LINKAGE_NAME (tsymbol)) == 0) | |
42848c96 UW |
1464 | { |
1465 | CORE_ADDR func; | |
b8d56208 | 1466 | |
f50776aa PA |
1467 | /* Ignore data symbols that are not function |
1468 | descriptors. */ | |
1469 | if (msymbol_is_function (objfile, msymbol, &func)) | |
42848c96 UW |
1470 | return func; |
1471 | } | |
c5aa993b | 1472 | } |
c906108c SS |
1473 | } |
1474 | return 0; | |
1475 | } | |
50e65b17 TT |
1476 | |
1477 | /* See minsyms.h. */ | |
1478 | ||
1479 | CORE_ADDR | |
1480 | minimal_symbol_upper_bound (struct bound_minimal_symbol minsym) | |
1481 | { | |
1482 | int i; | |
1483 | short section; | |
1484 | struct obj_section *obj_section; | |
1485 | CORE_ADDR result; | |
1486 | struct minimal_symbol *msymbol; | |
1487 | ||
1488 | gdb_assert (minsym.minsym != NULL); | |
1489 | ||
1490 | /* If the minimal symbol has a size, use it. Otherwise use the | |
1491 | lesser of the next minimal symbol in the same section, or the end | |
1492 | of the section, as the end of the function. */ | |
1493 | ||
1494 | if (MSYMBOL_SIZE (minsym.minsym) != 0) | |
77e371c0 | 1495 | return BMSYMBOL_VALUE_ADDRESS (minsym) + MSYMBOL_SIZE (minsym.minsym); |
50e65b17 TT |
1496 | |
1497 | /* Step over other symbols at this same address, and symbols in | |
1498 | other sections, to find the next symbol in this section with a | |
1499 | different address. */ | |
1500 | ||
1501 | msymbol = minsym.minsym; | |
efd66ac6 TT |
1502 | section = MSYMBOL_SECTION (msymbol); |
1503 | for (i = 1; MSYMBOL_LINKAGE_NAME (msymbol + i) != NULL; i++) | |
50e65b17 | 1504 | { |
77e371c0 TT |
1505 | if ((MSYMBOL_VALUE_RAW_ADDRESS (msymbol + i) |
1506 | != MSYMBOL_VALUE_RAW_ADDRESS (msymbol)) | |
efd66ac6 | 1507 | && MSYMBOL_SECTION (msymbol + i) == section) |
50e65b17 TT |
1508 | break; |
1509 | } | |
1510 | ||
efd66ac6 TT |
1511 | obj_section = MSYMBOL_OBJ_SECTION (minsym.objfile, minsym.minsym); |
1512 | if (MSYMBOL_LINKAGE_NAME (msymbol + i) != NULL | |
77e371c0 | 1513 | && (MSYMBOL_VALUE_ADDRESS (minsym.objfile, msymbol + i) |
efd66ac6 | 1514 | < obj_section_endaddr (obj_section))) |
77e371c0 | 1515 | result = MSYMBOL_VALUE_ADDRESS (minsym.objfile, msymbol + i); |
50e65b17 TT |
1516 | else |
1517 | /* We got the start address from the last msymbol in the objfile. | |
1518 | So the end address is the end of the section. */ | |
1519 | result = obj_section_endaddr (obj_section); | |
1520 | ||
1521 | return result; | |
1522 | } |