Commit | Line | Data |
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f8b76e70 | 1 | /* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger. |
ee0613d1 | 2 | Copyright 1990, 1991, 1992 Free Software Foundation, Inc. |
f8b76e70 | 3 | |
bd5635a1 RP |
4 | This file is part of GDB. |
5 | ||
bdbd5f50 | 6 | This program is free software; you can redistribute it and/or modify |
bd5635a1 | 7 | it under the terms of the GNU General Public License as published by |
bdbd5f50 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
bd5635a1 | 10 | |
bdbd5f50 | 11 | This program is distributed in the hope that it will be useful, |
bd5635a1 RP |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
bdbd5f50 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
bd5635a1 | 19 | |
f8b76e70 | 20 | |
b0246b3b FF |
21 | #include "defs.h" |
22 | ||
bd5635a1 | 23 | #include <sys/types.h> |
f8b76e70 | 24 | #include <signal.h> |
bd5635a1 RP |
25 | #include <string.h> |
26 | #include <link.h> | |
d0237a54 JK |
27 | #include <sys/param.h> |
28 | #include <fcntl.h> | |
be772100 JG |
29 | |
30 | #ifndef SVR4_SHARED_LIBS | |
31 | /* SunOS shared libs need the nlist structure. */ | |
32 | #include <a.out.h> | |
33 | #endif | |
f8b76e70 | 34 | |
bd5635a1 | 35 | #include "symtab.h" |
b0246b3b FF |
36 | #include "bfd.h" |
37 | #include "symfile.h" | |
be772100 | 38 | #include "objfiles.h" |
bd5635a1 RP |
39 | #include "gdbcore.h" |
40 | #include "command.h" | |
b3fdaf3d | 41 | #include "target.h" |
2403f49b | 42 | #include "frame.h" |
bdbd5f50 JG |
43 | #include "regex.h" |
44 | #include "inferior.h" | |
45 | ||
f8b76e70 FF |
46 | #define MAX_PATH_SIZE 256 /* FIXME: Should be dynamic */ |
47 | ||
48 | /* On SVR4 systems, for the initial implementation, use main() as the | |
49 | "startup mapping complete" breakpoint address. The models for SunOS | |
50 | and SVR4 dynamic linking debugger support are different in that SunOS | |
51 | hits one breakpoint when all mapping is complete while using the SVR4 | |
52 | debugger support takes two breakpoint hits for each file mapped, and | |
53 | there is no way to know when the "last" one is hit. Both these | |
54 | mechanisms should be tied to a "breakpoint service routine" that | |
55 | gets automatically executed whenever one of the breakpoints indicating | |
56 | a change in mapping is hit. This is a future enhancement. (FIXME) */ | |
57 | ||
58 | #define BKPT_AT_MAIN 1 | |
59 | ||
60 | /* local data declarations */ | |
61 | ||
d261ece7 | 62 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 FF |
63 | |
64 | #define DEBUG_BASE "_DYNAMIC" | |
65 | #define LM_ADDR(so) ((so) -> lm.lm_addr) | |
66 | #define LM_NEXT(so) ((so) -> lm.lm_next) | |
67 | #define LM_NAME(so) ((so) -> lm.lm_name) | |
68 | static struct link_dynamic dynamic_copy; | |
69 | static struct link_dynamic_2 ld_2_copy; | |
70 | static struct ld_debug debug_copy; | |
71 | static CORE_ADDR debug_addr; | |
72 | static CORE_ADDR flag_addr; | |
73 | ||
d261ece7 | 74 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 FF |
75 | |
76 | #define DEBUG_BASE "_r_debug" | |
77 | #define LM_ADDR(so) ((so) -> lm.l_addr) | |
78 | #define LM_NEXT(so) ((so) -> lm.l_next) | |
79 | #define LM_NAME(so) ((so) -> lm.l_name) | |
80 | static struct r_debug debug_copy; | |
f8b76e70 | 81 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ |
f8b76e70 | 82 | |
d261ece7 | 83 | #endif /* !SVR4_SHARED_LIBS */ |
bd5635a1 | 84 | |
bd5635a1 | 85 | struct so_list { |
f8b76e70 FF |
86 | struct so_list *next; /* next structure in linked list */ |
87 | struct link_map lm; /* copy of link map from inferior */ | |
88 | struct link_map *lmaddr; /* addr in inferior lm was read from */ | |
89 | CORE_ADDR lmend; /* upper addr bound of mapped object */ | |
90 | char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */ | |
91 | char symbols_loaded; /* flag: symbols read in yet? */ | |
92 | char from_tty; /* flag: print msgs? */ | |
93 | bfd *so_bfd; /* bfd for so_name */ | |
b0246b3b | 94 | struct objfile *objfile; /* objfile for loaded lib */ |
f8b76e70 FF |
95 | struct section_table *sections; |
96 | struct section_table *sections_end; | |
bd5635a1 RP |
97 | }; |
98 | ||
f8b76e70 FF |
99 | static struct so_list *so_list_head; /* List of known shared objects */ |
100 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ | |
101 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
102 | ||
b0246b3b FF |
103 | /* Local function prototypes */ |
104 | ||
105 | static void | |
106 | special_symbol_handling PARAMS ((struct so_list *)); | |
107 | ||
108 | static void | |
109 | sharedlibrary_command PARAMS ((char *, int)); | |
110 | ||
111 | static int | |
112 | enable_break PARAMS ((void)); | |
113 | ||
114 | static int | |
115 | disable_break PARAMS ((void)); | |
116 | ||
117 | static void | |
118 | info_sharedlibrary_command PARAMS ((void)); | |
119 | ||
120 | static int | |
121 | symbol_add_stub PARAMS ((char *)); | |
122 | ||
123 | static struct so_list * | |
124 | find_solib PARAMS ((struct so_list *)); | |
125 | ||
126 | static struct link_map * | |
127 | first_link_map_member PARAMS ((void)); | |
128 | ||
129 | static CORE_ADDR | |
130 | locate_base PARAMS ((void)); | |
131 | ||
be772100 JG |
132 | static void |
133 | solib_map_sections PARAMS ((struct so_list *)); | |
134 | ||
135 | #ifdef SVR4_SHARED_LIBS | |
136 | ||
b0246b3b FF |
137 | static int |
138 | look_for_base PARAMS ((int, CORE_ADDR)); | |
139 | ||
140 | static CORE_ADDR | |
141 | bfd_lookup_symbol PARAMS ((bfd *, char *)); | |
142 | ||
be772100 | 143 | #else |
b0246b3b FF |
144 | |
145 | static void | |
146 | solib_add_common_symbols PARAMS ((struct rtc_symb *, struct objfile *)); | |
147 | ||
148 | #endif | |
bd5635a1 | 149 | |
d0237a54 | 150 | /* |
f8b76e70 FF |
151 | |
152 | LOCAL FUNCTION | |
153 | ||
154 | solib_map_sections -- open bfd and build sections for shared lib | |
155 | ||
156 | SYNOPSIS | |
157 | ||
158 | static void solib_map_sections (struct so_list *so) | |
159 | ||
160 | DESCRIPTION | |
161 | ||
162 | Given a pointer to one of the shared objects in our list | |
163 | of mapped objects, use the recorded name to open a bfd | |
164 | descriptor for the object, build a section table, and then | |
165 | relocate all the section addresses by the base address at | |
166 | which the shared object was mapped. | |
167 | ||
168 | FIXMES | |
169 | ||
170 | In most (all?) cases the shared object file name recorded in the | |
171 | dynamic linkage tables will be a fully qualified pathname. For | |
172 | cases where it isn't, do we really mimic the systems search | |
173 | mechanism correctly in the below code (particularly the tilde | |
174 | expansion stuff?). | |
175 | */ | |
176 | ||
d0237a54 | 177 | static void |
f8b76e70 FF |
178 | solib_map_sections (so) |
179 | struct so_list *so; | |
d0237a54 JK |
180 | { |
181 | char *filename; | |
182 | char *scratch_pathname; | |
183 | int scratch_chan; | |
184 | struct section_table *p; | |
185 | ||
f8b76e70 | 186 | filename = tilde_expand (so -> so_name); |
d0237a54 JK |
187 | make_cleanup (free, filename); |
188 | ||
189 | scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, | |
f8b76e70 | 190 | &scratch_pathname); |
d0237a54 | 191 | if (scratch_chan < 0) |
f8b76e70 FF |
192 | { |
193 | scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, | |
194 | O_RDONLY, 0, &scratch_pathname); | |
195 | } | |
d0237a54 | 196 | if (scratch_chan < 0) |
f8b76e70 FF |
197 | { |
198 | perror_with_name (filename); | |
199 | } | |
200 | ||
201 | so -> so_bfd = bfd_fdopenr (scratch_pathname, NULL, scratch_chan); | |
202 | if (!so -> so_bfd) | |
203 | { | |
204 | error ("Could not open `%s' as an executable file: %s", | |
205 | scratch_pathname, bfd_errmsg (bfd_error)); | |
206 | } | |
207 | if (!bfd_check_format (so -> so_bfd, bfd_object)) | |
208 | { | |
209 | error ("\"%s\": not in executable format: %s.", | |
210 | scratch_pathname, bfd_errmsg (bfd_error)); | |
211 | } | |
212 | if (build_section_table (so -> so_bfd, &so -> sections, &so -> sections_end)) | |
213 | { | |
214 | error ("Can't find the file sections in `%s': %s", | |
215 | exec_bfd -> filename, bfd_errmsg (bfd_error)); | |
216 | } | |
217 | ||
218 | for (p = so -> sections; p < so -> sections_end; p++) | |
219 | { | |
220 | /* Relocate the section binding addresses as recorded in the shared | |
221 | object's file by the base address to which the object was actually | |
222 | mapped. */ | |
223 | p -> addr += (CORE_ADDR) LM_ADDR (so); | |
224 | p -> endaddr += (CORE_ADDR) LM_ADDR (so); | |
225 | so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend); | |
226 | } | |
227 | } | |
228 | ||
d261ece7 | 229 | /* Read all dynamically loaded common symbol definitions from the inferior |
b0246b3b | 230 | and add them to the minimal symbol table for the shared library objfile. */ |
d261ece7 | 231 | |
7f435241 FF |
232 | #ifndef SVR4_SHARED_LIBS |
233 | ||
d261ece7 | 234 | static void |
b0246b3b | 235 | solib_add_common_symbols (rtc_symp, objfile) |
d261ece7 | 236 | struct rtc_symb *rtc_symp; |
b0246b3b | 237 | struct objfile *objfile; |
d261ece7 SG |
238 | { |
239 | struct rtc_symb inferior_rtc_symb; | |
240 | struct nlist inferior_rtc_nlist; | |
b0246b3b FF |
241 | int len; |
242 | char *name; | |
243 | char *origname; | |
d261ece7 | 244 | |
b0246b3b FF |
245 | init_minimal_symbol_collection (); |
246 | make_cleanup (discard_minimal_symbols, 0); | |
d261ece7 SG |
247 | |
248 | while (rtc_symp) | |
249 | { | |
b0246b3b FF |
250 | read_memory ((CORE_ADDR) rtc_symp, |
251 | (char *) &inferior_rtc_symb, | |
252 | sizeof (inferior_rtc_symb)); | |
253 | read_memory ((CORE_ADDR) inferior_rtc_symb.rtc_sp, | |
254 | (char *) &inferior_rtc_nlist, | |
255 | sizeof(inferior_rtc_nlist)); | |
256 | if (inferior_rtc_nlist.n_type == N_COMM) | |
257 | { | |
258 | /* FIXME: The length of the symbol name is not available, but in the | |
259 | current implementation the common symbol is allocated immediately | |
260 | behind the name of the symbol. */ | |
261 | len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; | |
262 | ||
263 | origname = name = xmalloc (len); | |
264 | read_memory ((CORE_ADDR) inferior_rtc_nlist.n_un.n_name, name, len); | |
265 | ||
266 | /* Don't enter the symbol twice if the target is re-run. */ | |
d261ece7 SG |
267 | |
268 | #ifdef NAMES_HAVE_UNDERSCORE | |
b0246b3b FF |
269 | if (*name == '_') |
270 | { | |
271 | name++; | |
272 | } | |
d261ece7 | 273 | #endif |
b0246b3b FF |
274 | /* FIXME: Do we really want to exclude symbols which happen |
275 | to match symbols for other locations in the inferior's | |
276 | address space, even when they are in different linkage units? */ | |
277 | if (lookup_minimal_symbol (name, (struct objfile *) NULL) == NULL) | |
278 | { | |
279 | name = obsavestring (name, strlen (name), | |
280 | &objfile -> symbol_obstack); | |
281 | prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, | |
282 | mst_bss); | |
283 | } | |
284 | free (origname); | |
285 | } | |
286 | rtc_symp = inferior_rtc_symb.rtc_next; | |
d261ece7 SG |
287 | } |
288 | ||
b0246b3b FF |
289 | /* Install any minimal symbols that have been collected as the current |
290 | minimal symbols for this objfile. */ | |
291 | ||
292 | install_minimal_symbols (objfile); | |
d261ece7 SG |
293 | } |
294 | ||
7f435241 FF |
295 | #endif /* SVR4_SHARED_LIBS */ |
296 | ||
be772100 JG |
297 | #ifdef SVR4_SHARED_LIBS |
298 | ||
f8b76e70 FF |
299 | /* |
300 | ||
301 | LOCAL FUNCTION | |
302 | ||
303 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
304 | ||
305 | SYNOPSIS | |
306 | ||
307 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) | |
308 | ||
309 | DESCRIPTION | |
310 | ||
311 | An expensive way to lookup the value of a single symbol for | |
312 | bfd's that are only temporary anyway. This is used by the | |
313 | shared library support to find the address of the debugger | |
314 | interface structures in the shared library. | |
315 | ||
316 | Note that 0 is specifically allowed as an error return (no | |
317 | such symbol). | |
318 | ||
319 | FIXME: See if there is a less "expensive" way of doing this. | |
320 | Also see if there is already another bfd or gdb function | |
321 | that specifically does this, and if so, use it. | |
322 | */ | |
323 | ||
324 | static CORE_ADDR | |
b0246b3b FF |
325 | bfd_lookup_symbol (abfd, symname) |
326 | bfd *abfd; | |
327 | char *symname; | |
f8b76e70 FF |
328 | { |
329 | unsigned int storage_needed; | |
330 | asymbol *sym; | |
331 | asymbol **symbol_table; | |
332 | unsigned int number_of_symbols; | |
333 | unsigned int i; | |
334 | struct cleanup *back_to; | |
335 | CORE_ADDR symaddr = 0; | |
f8b76e70 FF |
336 | |
337 | storage_needed = get_symtab_upper_bound (abfd); | |
338 | ||
339 | if (storage_needed > 0) | |
340 | { | |
be772100 JG |
341 | symbol_table = (asymbol **) xmalloc (storage_needed); |
342 | back_to = make_cleanup (free, (PTR)symbol_table); | |
f8b76e70 FF |
343 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
344 | ||
345 | for (i = 0; i < number_of_symbols; i++) | |
d0237a54 | 346 | { |
f8b76e70 FF |
347 | sym = *symbol_table++; |
348 | if (strcmp (sym -> name, symname) == 0) | |
349 | { | |
350 | symaddr = sym -> value; | |
351 | break; | |
352 | } | |
d0237a54 | 353 | } |
f8b76e70 | 354 | do_cleanups (back_to); |
d0237a54 | 355 | } |
f8b76e70 | 356 | return (symaddr); |
d0237a54 JK |
357 | } |
358 | ||
f8b76e70 FF |
359 | /* |
360 | ||
d261ece7 SG |
361 | LOCAL FUNCTION |
362 | ||
363 | look_for_base -- examine file for each mapped address segment | |
364 | ||
365 | SYNOPSYS | |
366 | ||
367 | static int look_for_base (int fd, CORE_ADDR baseaddr) | |
368 | ||
369 | DESCRIPTION | |
370 | ||
371 | This function is passed to proc_iterate_over_mappings, which | |
372 | causes it to get called once for each mapped address space, with | |
373 | an open file descriptor for the file mapped to that space, and the | |
374 | base address of that mapped space. | |
375 | ||
376 | Our job is to find the symbol DEBUG_BASE in the file that this | |
377 | fd is open on, if it exists, and if so, initialize the dynamic | |
378 | linker structure base address debug_base. | |
379 | ||
380 | Note that this is a computationally expensive proposition, since | |
381 | we basically have to open a bfd on every call, so we specifically | |
382 | avoid opening the exec file. | |
383 | */ | |
384 | ||
385 | static int | |
b0246b3b FF |
386 | look_for_base (fd, baseaddr) |
387 | int fd; | |
388 | CORE_ADDR baseaddr; | |
d261ece7 SG |
389 | { |
390 | bfd *interp_bfd; | |
391 | CORE_ADDR address; | |
392 | ||
393 | /* If the fd is -1, then there is no file that corresponds to this | |
394 | mapped memory segment, so skip it. Also, if the fd corresponds | |
395 | to the exec file, skip it as well. */ | |
396 | ||
397 | if ((fd == -1) || fdmatch (fileno ((FILE *)(exec_bfd -> iostream)), fd)) | |
398 | { | |
399 | return (0); | |
400 | } | |
401 | ||
402 | /* Try to open whatever random file this fd corresponds to. Note that | |
403 | we have no way currently to find the filename. Don't gripe about | |
404 | any problems we might have, just fail. */ | |
405 | ||
406 | if ((interp_bfd = bfd_fdopenr ("unnamed", NULL, fd)) == NULL) | |
407 | { | |
408 | return (0); | |
409 | } | |
410 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
411 | { | |
412 | bfd_close (interp_bfd); | |
413 | return (0); | |
414 | } | |
415 | ||
416 | /* Now try to find our DEBUG_BASE symbol in this file, which we at | |
417 | least know to be a valid ELF executable or shared library. */ | |
418 | ||
419 | if ((address = bfd_lookup_symbol (interp_bfd, DEBUG_BASE)) == 0) | |
420 | { | |
421 | bfd_close (interp_bfd); | |
422 | return (0); | |
423 | } | |
424 | ||
425 | /* Eureka! We found the symbol. But now we may need to relocate it | |
426 | by the base address. If the symbol's value is less than the base | |
427 | address of the shared library, then it hasn't yet been relocated | |
428 | by the dynamic linker, and we have to do it ourself. FIXME: Note | |
429 | that we make the assumption that the first segment that corresponds | |
430 | to the shared library has the base address to which the library | |
431 | was relocated. */ | |
432 | ||
433 | if (address < baseaddr) | |
434 | { | |
435 | address += baseaddr; | |
436 | } | |
437 | debug_base = address; | |
438 | bfd_close (interp_bfd); | |
439 | return (1); | |
440 | } | |
441 | ||
be772100 JG |
442 | #endif |
443 | ||
d261ece7 SG |
444 | /* |
445 | ||
f8b76e70 FF |
446 | LOCAL FUNCTION |
447 | ||
448 | locate_base -- locate the base address of dynamic linker structs | |
449 | ||
450 | SYNOPSIS | |
451 | ||
452 | CORE_ADDR locate_base (void) | |
453 | ||
454 | DESCRIPTION | |
455 | ||
456 | For both the SunOS and SVR4 shared library implementations, if the | |
457 | inferior executable has been linked dynamically, there is a single | |
458 | address somewhere in the inferior's data space which is the key to | |
d261ece7 | 459 | locating all of the dynamic linker's runtime structures. This |
f8b76e70 FF |
460 | address is the value of the symbol defined by the macro DEBUG_BASE. |
461 | The job of this function is to find and return that address, or to | |
462 | return 0 if there is no such address (the executable is statically | |
463 | linked for example). | |
464 | ||
465 | For SunOS, the job is almost trivial, since the dynamic linker and | |
466 | all of it's structures are statically linked to the executable at | |
467 | link time. Thus the symbol for the address we are looking for has | |
b0246b3b FF |
468 | already been added to the minimal symbol table for the executable's |
469 | objfile at the time the symbol file's symbols were read, and all we | |
470 | have to do is look it up there. Note that we explicitly do NOT want | |
471 | to find the copies in the shared library. | |
f8b76e70 FF |
472 | |
473 | The SVR4 version is much more complicated because the dynamic linker | |
d261ece7 SG |
474 | and it's structures are located in the shared C library, which gets |
475 | run as the executable's "interpreter" by the kernel. We have to go | |
476 | to a lot more work to discover the address of DEBUG_BASE. Because | |
f8b76e70 | 477 | of this complexity, we cache the value we find and return that value |
b0246b3b FF |
478 | on subsequent invocations. Note there is no copy in the executable |
479 | symbol tables. | |
f8b76e70 | 480 | |
d261ece7 SG |
481 | Note that we can assume nothing about the process state at the time |
482 | we need to find this address. We may be stopped on the first instruc- | |
483 | tion of the interpreter (C shared library), the first instruction of | |
484 | the executable itself, or somewhere else entirely (if we attached | |
485 | to the process for example). | |
f8b76e70 FF |
486 | |
487 | */ | |
488 | ||
489 | static CORE_ADDR | |
490 | locate_base () | |
491 | { | |
f8b76e70 | 492 | |
d261ece7 | 493 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 | 494 | |
b0246b3b | 495 | struct minimal_symbol *msymbol; |
d261ece7 | 496 | CORE_ADDR address = 0; |
f8b76e70 | 497 | |
b0246b3b FF |
498 | /* For SunOS, we want to limit the search for DEBUG_BASE to the executable |
499 | being debugged, since there is a duplicate named symbol in the shared | |
500 | library. We don't want the shared library versions. */ | |
501 | ||
502 | msymbol = lookup_minimal_symbol (DEBUG_BASE, symfile_objfile); | |
503 | if ((msymbol != NULL) && (msymbol -> address != 0)) | |
f8b76e70 | 504 | { |
b0246b3b | 505 | address = msymbol -> address; |
f8b76e70 | 506 | } |
d261ece7 | 507 | return (address); |
f8b76e70 | 508 | |
d261ece7 | 509 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 510 | |
d261ece7 SG |
511 | /* Check to see if we have a currently valid address, and if so, avoid |
512 | doing all this work again and just return the cached address. If | |
513 | we have no cached address, ask the /proc support interface to iterate | |
514 | over the list of mapped address segments, calling look_for_base() for | |
515 | each segment. When we are done, we will have either found the base | |
516 | address or not. */ | |
f8b76e70 | 517 | |
d261ece7 | 518 | if (debug_base == 0) |
f8b76e70 | 519 | { |
d261ece7 | 520 | proc_iterate_over_mappings (look_for_base); |
f8b76e70 | 521 | } |
d261ece7 | 522 | return (debug_base); |
f8b76e70 | 523 | |
d261ece7 | 524 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
525 | |
526 | } | |
bd5635a1 | 527 | |
f8b76e70 FF |
528 | static struct link_map * |
529 | first_link_map_member () | |
bd5635a1 | 530 | { |
f8b76e70 FF |
531 | struct link_map *lm = NULL; |
532 | ||
d261ece7 | 533 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 | 534 | |
b0246b3b | 535 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); |
f8b76e70 FF |
536 | if (dynamic_copy.ld_version >= 2) |
537 | { | |
538 | /* It is a version that we can deal with, so read in the secondary | |
539 | structure and find the address of the link map list from it. */ | |
b0246b3b | 540 | read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, (char *) &ld_2_copy, |
f8b76e70 FF |
541 | sizeof (struct link_dynamic_2)); |
542 | lm = ld_2_copy.ld_loaded; | |
543 | } | |
544 | ||
d261ece7 | 545 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 546 | |
b0246b3b | 547 | read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug)); |
f8b76e70 FF |
548 | lm = debug_copy.r_map; |
549 | ||
d261ece7 | 550 | #endif /* !SVR4_SHARED_LIBS */ |
d0237a54 | 551 | |
f8b76e70 FF |
552 | return (lm); |
553 | } | |
554 | ||
555 | /* | |
556 | ||
b0246b3b | 557 | LOCAL FUNCTION |
f8b76e70 FF |
558 | |
559 | find_solib -- step through list of shared objects | |
560 | ||
561 | SYNOPSIS | |
562 | ||
563 | struct so_list *find_solib (struct so_list *so_list_ptr) | |
564 | ||
565 | DESCRIPTION | |
566 | ||
567 | This module contains the routine which finds the names of any | |
568 | loaded "images" in the current process. The argument in must be | |
569 | NULL on the first call, and then the returned value must be passed | |
570 | in on subsequent calls. This provides the capability to "step" down | |
571 | the list of loaded objects. On the last object, a NULL value is | |
572 | returned. | |
d0237a54 | 573 | |
f8b76e70 FF |
574 | The arg and return value are "struct link_map" pointers, as defined |
575 | in <link.h>. | |
576 | */ | |
d0237a54 | 577 | |
b0246b3b | 578 | static struct so_list * |
f8b76e70 FF |
579 | find_solib (so_list_ptr) |
580 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ | |
581 | { | |
582 | struct so_list *so_list_next = NULL; | |
583 | struct link_map *lm = NULL; | |
584 | struct so_list *new; | |
585 | ||
586 | if (so_list_ptr == NULL) | |
587 | { | |
588 | /* We are setting up for a new scan through the loaded images. */ | |
589 | if ((so_list_next = so_list_head) == NULL) | |
590 | { | |
591 | /* We have not already read in the dynamic linking structures | |
592 | from the inferior, lookup the address of the base structure. */ | |
593 | debug_base = locate_base (); | |
594 | if (debug_base > 0) | |
595 | { | |
596 | /* Read the base structure in and find the address of the first | |
597 | link map list member. */ | |
598 | lm = first_link_map_member (); | |
599 | } | |
600 | } | |
601 | } | |
602 | else | |
603 | { | |
604 | /* We have been called before, and are in the process of walking | |
605 | the shared library list. Advance to the next shared object. */ | |
606 | if ((lm = LM_NEXT (so_list_ptr)) == NULL) | |
607 | { | |
608 | /* We have hit the end of the list, so check to see if any were | |
609 | added, but be quiet if we can't read from the target any more. */ | |
610 | int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lmaddr, | |
611 | (char *) &(so_list_ptr -> lm), | |
612 | sizeof (struct link_map)); | |
613 | if (status == 0) | |
614 | { | |
615 | lm = LM_NEXT (so_list_ptr); | |
616 | } | |
617 | else | |
618 | { | |
619 | lm = NULL; | |
620 | } | |
621 | } | |
622 | so_list_next = so_list_ptr -> next; | |
623 | } | |
624 | if ((so_list_next == NULL) && (lm != NULL)) | |
625 | { | |
626 | /* Get next link map structure from inferior image and build a local | |
627 | abbreviated load_map structure */ | |
628 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
629 | (void) memset ((char *) new, 0, sizeof (struct so_list)); | |
630 | new -> lmaddr = lm; | |
631 | /* Add the new node as the next node in the list, or as the root | |
632 | node if this is the first one. */ | |
633 | if (so_list_ptr != NULL) | |
634 | { | |
635 | so_list_ptr -> next = new; | |
636 | } | |
637 | else | |
638 | { | |
639 | so_list_head = new; | |
640 | } | |
641 | so_list_next = new; | |
b0246b3b FF |
642 | read_memory ((CORE_ADDR) lm, (char *) &(new -> lm), |
643 | sizeof (struct link_map)); | |
f8b76e70 FF |
644 | /* For the SVR4 version, there is one entry that has no name |
645 | (for the inferior executable) since it is not a shared object. */ | |
646 | if (LM_NAME (new) != 0) | |
647 | { | |
ee0613d1 JG |
648 | if (!target_read_string((CORE_ADDR) LM_NAME (new), new -> so_name, |
649 | MAX_PATH_SIZE - 1)) | |
650 | error ("find_solib: Can't read pathname for load map\n"); | |
f8b76e70 FF |
651 | new -> so_name[MAX_PATH_SIZE - 1] = 0; |
652 | solib_map_sections (new); | |
653 | } | |
654 | } | |
655 | return (so_list_next); | |
bd5635a1 | 656 | } |
d0237a54 | 657 | |
bdbd5f50 JG |
658 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
659 | ||
660 | static int | |
661 | symbol_add_stub (arg) | |
662 | char *arg; | |
d0237a54 | 663 | { |
f8b76e70 FF |
664 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
665 | ||
b0246b3b FF |
666 | so -> objfile = symbol_file_add (so -> so_name, so -> from_tty, |
667 | (unsigned int) LM_ADDR (so), 0, 0, 0); | |
f8b76e70 | 668 | return (1); |
d0237a54 | 669 | } |
bd5635a1 | 670 | |
f8b76e70 FF |
671 | /* |
672 | ||
673 | GLOBAL FUNCTION | |
674 | ||
675 | solib_add -- add a shared library file to the symtab and section list | |
676 | ||
677 | SYNOPSIS | |
678 | ||
679 | void solib_add (char *arg_string, int from_tty, | |
680 | struct target_ops *target) | |
681 | ||
682 | DESCRIPTION | |
683 | ||
684 | */ | |
bdbd5f50 JG |
685 | |
686 | void | |
687 | solib_add (arg_string, from_tty, target) | |
688 | char *arg_string; | |
689 | int from_tty; | |
690 | struct target_ops *target; | |
bd5635a1 | 691 | { |
f8b76e70 FF |
692 | register struct so_list *so = NULL; /* link map state variable */ |
693 | char *re_err; | |
694 | int count; | |
695 | int old; | |
696 | ||
697 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) | |
698 | { | |
699 | error ("Invalid regexp: %s", re_err); | |
700 | } | |
701 | ||
bdbd5f50 JG |
702 | /* Getting new symbols may change our opinion about what is |
703 | frameless. */ | |
704 | reinit_frame_cache (); | |
bdbd5f50 | 705 | |
f8b76e70 FF |
706 | while ((so = find_solib (so)) != NULL) |
707 | { | |
708 | if (so -> so_name[0] && re_exec (so -> so_name)) | |
709 | { | |
710 | if (so -> symbols_loaded) | |
711 | { | |
bdbd5f50 | 712 | if (from_tty) |
f8b76e70 FF |
713 | { |
714 | printf ("Symbols already loaded for %s\n", so -> so_name); | |
715 | } | |
716 | } | |
717 | else | |
718 | { | |
f8b76e70 FF |
719 | catch_errors (symbol_add_stub, (char *) so, |
720 | "Error while reading shared library symbols:\n"); | |
b0246b3b FF |
721 | |
722 | special_symbol_handling (so); | |
723 | so -> symbols_loaded = 1; | |
724 | so -> from_tty = from_tty; | |
f8b76e70 FF |
725 | } |
726 | } | |
727 | } | |
728 | ||
bdbd5f50 JG |
729 | /* Now add the shared library sections to the section table of the |
730 | specified target, if any. */ | |
f8b76e70 FF |
731 | if (target) |
732 | { | |
733 | /* Count how many new section_table entries there are. */ | |
734 | so = NULL; | |
735 | count = 0; | |
736 | while ((so = find_solib (so)) != NULL) | |
737 | { | |
738 | if (so -> so_name[0]) | |
739 | { | |
740 | count += so -> sections_end - so -> sections; | |
741 | } | |
742 | } | |
743 | ||
744 | if (count) | |
745 | { | |
746 | /* Reallocate the target's section table including the new size. */ | |
ee0613d1 | 747 | if (target -> to_sections) |
f8b76e70 | 748 | { |
ee0613d1 JG |
749 | old = target -> to_sections_end - target -> to_sections; |
750 | target -> to_sections = (struct section_table *) | |
751 | realloc ((char *)target -> to_sections, | |
f8b76e70 FF |
752 | (sizeof (struct section_table)) * (count + old)); |
753 | } | |
754 | else | |
755 | { | |
756 | old = 0; | |
ee0613d1 | 757 | target -> to_sections = (struct section_table *) |
f8b76e70 FF |
758 | malloc ((sizeof (struct section_table)) * count); |
759 | } | |
ee0613d1 | 760 | target -> to_sections_end = target -> to_sections + (count + old); |
f8b76e70 FF |
761 | |
762 | /* Add these section table entries to the target's table. */ | |
763 | while ((so = find_solib (so)) != NULL) | |
764 | { | |
765 | if (so -> so_name[0]) | |
766 | { | |
767 | count = so -> sections_end - so -> sections; | |
ee0613d1 | 768 | bcopy (so -> sections, (char *)(target -> to_sections + old), |
f8b76e70 FF |
769 | (sizeof (struct section_table)) * count); |
770 | old += count; | |
771 | } | |
772 | } | |
773 | } | |
774 | } | |
bd5635a1 | 775 | } |
bdbd5f50 | 776 | |
f8b76e70 | 777 | /* |
bd5635a1 | 778 | |
f8b76e70 FF |
779 | LOCAL FUNCTION |
780 | ||
781 | info_sharedlibrary_command -- code for "info sharedlibrary" | |
782 | ||
783 | SYNOPSIS | |
784 | ||
785 | static void info_sharedlibrary_command () | |
786 | ||
787 | DESCRIPTION | |
bd5635a1 | 788 | |
f8b76e70 FF |
789 | Walk through the shared library list and print information |
790 | about each attached library. | |
791 | */ | |
792 | ||
793 | static void | |
794 | info_sharedlibrary_command () | |
795 | { | |
796 | register struct so_list *so = NULL; /* link map state variable */ | |
797 | int header_done = 0; | |
798 | ||
799 | if (exec_bfd == NULL) | |
800 | { | |
801 | printf ("No exec file.\n"); | |
802 | return; | |
803 | } | |
804 | while ((so = find_solib (so)) != NULL) | |
805 | { | |
806 | if (so -> so_name[0]) | |
807 | { | |
808 | if (!header_done) | |
809 | { | |
810 | printf("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", | |
811 | "Shared Object Library"); | |
812 | header_done++; | |
813 | } | |
b0246b3b | 814 | printf ("%-12s", local_hex_string_custom ((int) LM_ADDR (so), "08")); |
f8b76e70 FF |
815 | printf ("%-12s", local_hex_string_custom (so -> lmend, "08")); |
816 | printf ("%-12s", so -> symbols_loaded ? "Yes" : "No"); | |
817 | printf ("%s\n", so -> so_name); | |
bd5635a1 | 818 | } |
bd5635a1 | 819 | } |
f8b76e70 FF |
820 | if (so_list_head == NULL) |
821 | { | |
822 | printf ("No shared libraries loaded at this time.\n"); | |
bd5635a1 RP |
823 | } |
824 | } | |
825 | ||
826 | /* | |
f8b76e70 FF |
827 | |
828 | GLOBAL FUNCTION | |
829 | ||
830 | solib_address -- check to see if an address is in a shared lib | |
831 | ||
832 | SYNOPSIS | |
833 | ||
834 | int solib_address (CORE_ADDR address) | |
835 | ||
836 | DESCRIPTION | |
837 | ||
838 | Provides a hook for other gdb routines to discover whether or | |
839 | not a particular address is within the mapped address space of | |
840 | a shared library. Any address between the base mapping address | |
841 | and the first address beyond the end of the last mapping, is | |
842 | considered to be within the shared library address space, for | |
843 | our purposes. | |
844 | ||
845 | For example, this routine is called at one point to disable | |
846 | breakpoints which are in shared libraries that are not currently | |
847 | mapped in. | |
848 | */ | |
849 | ||
bd5635a1 | 850 | int |
f8b76e70 | 851 | solib_address (address) |
bd5635a1 RP |
852 | CORE_ADDR address; |
853 | { | |
f8b76e70 FF |
854 | register struct so_list *so = 0; /* link map state variable */ |
855 | ||
856 | while ((so = find_solib (so)) != NULL) | |
857 | { | |
858 | if (so -> so_name[0]) | |
859 | { | |
860 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && | |
861 | (address < (CORE_ADDR) so -> lmend)) | |
862 | { | |
863 | return (1); | |
864 | } | |
865 | } | |
866 | } | |
867 | return (0); | |
868 | } | |
869 | ||
870 | /* Called by free_all_symtabs */ | |
bd5635a1 | 871 | |
f8b76e70 FF |
872 | void |
873 | clear_solib() | |
874 | { | |
875 | struct so_list *next; | |
876 | ||
877 | while (so_list_head) | |
878 | { | |
879 | if (so_list_head -> sections) | |
880 | { | |
be772100 | 881 | free ((PTR)so_list_head -> sections); |
f8b76e70 FF |
882 | } |
883 | if (so_list_head -> so_bfd) | |
884 | { | |
885 | bfd_close (so_list_head -> so_bfd); | |
886 | } | |
887 | next = so_list_head -> next; | |
be772100 | 888 | free((PTR)so_list_head); |
f8b76e70 | 889 | so_list_head = next; |
bd5635a1 | 890 | } |
f8b76e70 | 891 | debug_base = 0; |
bd5635a1 RP |
892 | } |
893 | ||
894 | /* | |
f8b76e70 FF |
895 | |
896 | LOCAL FUNCTION | |
897 | ||
898 | disable_break -- remove the "mapping changed" breakpoint | |
899 | ||
900 | SYNOPSIS | |
901 | ||
902 | static int disable_break () | |
903 | ||
904 | DESCRIPTION | |
905 | ||
906 | Removes the breakpoint that gets hit when the dynamic linker | |
907 | completes a mapping change. | |
908 | ||
bd5635a1 | 909 | */ |
f8b76e70 FF |
910 | |
911 | static int | |
912 | disable_break () | |
bd5635a1 | 913 | { |
f8b76e70 FF |
914 | int status = 1; |
915 | ||
d261ece7 | 916 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 FF |
917 | |
918 | int in_debugger = 0; | |
919 | ||
f8b76e70 FF |
920 | /* Read the debugger structure from the inferior to retrieve the |
921 | address of the breakpoint and the original contents of the | |
922 | breakpoint address. Remove the breakpoint by writing the original | |
923 | contents back. */ | |
924 | ||
b0246b3b | 925 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); |
d261ece7 SG |
926 | |
927 | /* Set `in_debugger' to zero now. */ | |
928 | ||
b0246b3b | 929 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); |
d261ece7 | 930 | |
f8b76e70 | 931 | breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr; |
b0246b3b | 932 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, |
f8b76e70 FF |
933 | sizeof (debug_copy.ldd_bp_inst)); |
934 | ||
d261ece7 | 935 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 FF |
936 | |
937 | /* Note that breakpoint address and original contents are in our address | |
938 | space, so we just need to write the original contents back. */ | |
939 | ||
940 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
941 | { | |
942 | status = 0; | |
943 | } | |
944 | ||
d261ece7 | 945 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
946 | |
947 | /* For the SVR4 version, we always know the breakpoint address. For the | |
948 | SunOS version we don't know it until the above code is executed. | |
949 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
950 | ||
951 | if (stop_pc != breakpoint_addr) | |
952 | { | |
953 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
954 | } | |
955 | ||
956 | return (status); | |
bdbd5f50 JG |
957 | } |
958 | ||
f8b76e70 | 959 | /* |
bdbd5f50 | 960 | |
f8b76e70 FF |
961 | LOCAL FUNCTION |
962 | ||
963 | enable_break -- arrange for dynamic linker to hit breakpoint | |
964 | ||
965 | SYNOPSIS | |
966 | ||
967 | int enable_break (void) | |
968 | ||
969 | DESCRIPTION | |
970 | ||
971 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
972 | debugger interface, support for arranging for the inferior to hit | |
973 | a breakpoint after mapping in the shared libraries. This function | |
974 | enables that breakpoint. | |
975 | ||
976 | For SunOS, there is a special flag location (in_debugger) which we | |
977 | set to 1. When the dynamic linker sees this flag set, it will set | |
978 | a breakpoint at a location known only to itself, after saving the | |
979 | original contents of that place and the breakpoint address itself, | |
980 | in it's own internal structures. When we resume the inferior, it | |
981 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
982 | We handle this (in a different place) by restoring the contents of | |
983 | the breakpointed location (which is only known after it stops), | |
984 | chasing around to locate the shared libraries that have been | |
985 | loaded, then resuming. | |
986 | ||
987 | For SVR4, the debugger interface structure contains a member (r_brk) | |
988 | which is statically initialized at the time the shared library is | |
989 | built, to the offset of a function (_r_debug_state) which is guaran- | |
990 | teed to be called once before mapping in a library, and again when | |
991 | the mapping is complete. At the time we are examining this member, | |
992 | it contains only the unrelocated offset of the function, so we have | |
993 | to do our own relocation. Later, when the dynamic linker actually | |
994 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
995 | ||
996 | The debugger interface structure also contains an enumeration which | |
997 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
998 | depending upon whether or not the library is being mapped or unmapped, | |
999 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1000 | */ | |
1001 | ||
1002 | static int | |
1003 | enable_break () | |
bdbd5f50 | 1004 | { |
bdbd5f50 | 1005 | |
f8b76e70 FF |
1006 | int j; |
1007 | ||
d261ece7 | 1008 | #ifndef SVR4_SHARED_LIBS |
bdbd5f50 | 1009 | |
f8b76e70 FF |
1010 | int in_debugger; |
1011 | ||
bdbd5f50 | 1012 | /* Get link_dynamic structure */ |
f8b76e70 FF |
1013 | |
1014 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1015 | sizeof (dynamic_copy)); | |
1016 | if (j) | |
1017 | { | |
1018 | /* unreadable */ | |
1019 | return (0); | |
1020 | } | |
06b6c733 | 1021 | |
bdbd5f50 | 1022 | /* Calc address of debugger interface structure */ |
f8b76e70 FF |
1023 | |
1024 | debug_addr = (CORE_ADDR) dynamic_copy.ldd; | |
1025 | ||
bdbd5f50 | 1026 | /* Calc address of `in_debugger' member of debugger interface structure */ |
f8b76e70 FF |
1027 | |
1028 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
1029 | (char *) &debug_copy); | |
1030 | ||
bdbd5f50 | 1031 | /* Write a value of 1 to this member. */ |
f8b76e70 | 1032 | |
bdbd5f50 | 1033 | in_debugger = 1; |
bdbd5f50 | 1034 | |
b0246b3b | 1035 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); |
f8b76e70 | 1036 | |
d261ece7 | 1037 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 FF |
1038 | |
1039 | #ifdef BKPT_AT_MAIN | |
1040 | ||
b0246b3b | 1041 | struct minimal_symbol *msymbol; |
f8b76e70 | 1042 | |
b0246b3b FF |
1043 | msymbol = lookup_minimal_symbol ("main", symfile_objfile); |
1044 | if ((msymbol != NULL) && (msymbol -> address != 0)) | |
f8b76e70 | 1045 | { |
b0246b3b | 1046 | breakpoint_addr = msymbol -> address; |
f8b76e70 FF |
1047 | } |
1048 | else | |
1049 | { | |
1050 | return (0); | |
1051 | } | |
1052 | ||
1053 | if (target_insert_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
1054 | { | |
1055 | return (0); | |
1056 | } | |
1057 | ||
1058 | #else /* !BKPT_AT_MAIN */ | |
1059 | ||
1060 | struct symtab_and_line sal; | |
1061 | ||
1062 | /* Read the debugger interface structure directly. */ | |
1063 | ||
1064 | read_memory (debug_base, (char *) &debug_copy, sizeof (debug_copy)); | |
1065 | ||
1066 | /* Set breakpoint at the debugger interface stub routine that will | |
1067 | be called just prior to each mapping change and again after the | |
1068 | mapping change is complete. Set up the (nonexistent) handler to | |
1069 | deal with hitting these breakpoints. (FIXME). */ | |
1070 | ||
1071 | warning ("'%s': line %d: missing SVR4 support code", __FILE__, __LINE__); | |
1072 | ||
1073 | #endif /* BKPT_AT_MAIN */ | |
1074 | ||
d261ece7 | 1075 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
1076 | |
1077 | return (1); | |
1078 | } | |
1079 | ||
1080 | /* | |
1081 | ||
1082 | GLOBAL FUNCTION | |
1083 | ||
1084 | solib_create_inferior_hook -- shared library startup support | |
1085 | ||
1086 | SYNOPSIS | |
1087 | ||
1088 | void solib_create_inferior_hook() | |
1089 | ||
1090 | DESCRIPTION | |
1091 | ||
1092 | When gdb starts up the inferior, it nurses it along (through the | |
1093 | shell) until it is ready to execute it's first instruction. At this | |
1094 | point, this function gets called via expansion of the macro | |
1095 | SOLIB_CREATE_INFERIOR_HOOK. | |
1096 | ||
1097 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1098 | can arrange to cooperate with the dynamic linker to discover the | |
1099 | names of shared libraries that are dynamically linked, and the | |
1100 | base addresses to which they are linked. | |
1101 | ||
1102 | This function is responsible for discovering those names and | |
1103 | addresses, and saving sufficient information about them to allow | |
1104 | their symbols to be read at a later time. | |
1105 | ||
1106 | FIXME | |
1107 | ||
1108 | Between enable_break() and disable_break(), this code does not | |
1109 | properly handle hitting breakpoints which the user might have | |
1110 | set in the startup code or in the dynamic linker itself. Proper | |
1111 | handling will probably have to wait until the implementation is | |
1112 | changed to use the "breakpoint handler function" method. | |
1113 | ||
1114 | Also, what if child has exit()ed? Must exit loop somehow. | |
1115 | */ | |
1116 | ||
1117 | void | |
1118 | solib_create_inferior_hook() | |
1119 | { | |
f8b76e70 FF |
1120 | |
1121 | if ((debug_base = locate_base ()) == 0) | |
1122 | { | |
1123 | /* Can't find the symbol or the executable is statically linked. */ | |
1124 | return; | |
1125 | } | |
1126 | ||
1127 | if (!enable_break ()) | |
1128 | { | |
1129 | warning ("shared library handler failed to enable breakpoint"); | |
1130 | return; | |
1131 | } | |
1132 | ||
1133 | /* Now run the target. It will eventually hit the breakpoint, at | |
1134 | which point all of the libraries will have been mapped in and we | |
1135 | can go groveling around in the dynamic linker structures to find | |
1136 | out what we need to know about them. */ | |
bdbd5f50 JG |
1137 | |
1138 | clear_proceed_status (); | |
1139 | stop_soon_quietly = 1; | |
f8b76e70 FF |
1140 | stop_signal = 0; |
1141 | do | |
bdbd5f50 | 1142 | { |
bdbd5f50 JG |
1143 | target_resume (0, stop_signal); |
1144 | wait_for_inferior (); | |
1145 | } | |
f8b76e70 | 1146 | while (stop_signal != SIGTRAP); |
bdbd5f50 | 1147 | stop_soon_quietly = 0; |
f8b76e70 FF |
1148 | |
1149 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1150 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1151 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1152 | add any shared libraries that were mapped in. */ | |
bdbd5f50 | 1153 | |
f8b76e70 FF |
1154 | if (DECR_PC_AFTER_BREAK) |
1155 | { | |
1156 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1157 | write_register (PC_REGNUM, stop_pc); | |
1158 | } | |
1159 | ||
1160 | if (!disable_break ()) | |
1161 | { | |
1162 | warning ("shared library handler failed to disable breakpoint"); | |
1163 | } | |
1164 | ||
1165 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
bdbd5f50 JG |
1166 | } |
1167 | ||
f8b76e70 FF |
1168 | /* |
1169 | ||
b0246b3b FF |
1170 | LOCAL FUNCTION |
1171 | ||
1172 | special_symbol_handling -- additional shared library symbol handling | |
1173 | ||
1174 | SYNOPSIS | |
1175 | ||
1176 | void special_symbol_handling (struct so_list *so) | |
1177 | ||
1178 | DESCRIPTION | |
1179 | ||
1180 | Once the symbols from a shared object have been loaded in the usual | |
1181 | way, we are called to do any system specific symbol handling that | |
1182 | is needed. | |
1183 | ||
1184 | For Suns, this consists of grunging around in the dynamic linkers | |
1185 | structures to find symbol definitions for "common" symbols and | |
1186 | adding them to the minimal symbol table for the corresponding | |
1187 | objfile. | |
1188 | ||
1189 | */ | |
1190 | ||
1191 | static void | |
1192 | special_symbol_handling (so) | |
1193 | struct so_list *so; | |
1194 | { | |
1195 | #ifndef SVR4_SHARED_LIBS | |
1196 | ||
1197 | /* Read the debugger structure from the inferior, just to make sure | |
1198 | we have a current copy. */ | |
1199 | ||
1200 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); | |
1201 | ||
1202 | /* Get common symbol definitions for the loaded object. */ | |
1203 | ||
1204 | if (debug_copy.ldd_cp) | |
1205 | { | |
1206 | solib_add_common_symbols (debug_copy.ldd_cp, so -> objfile); | |
1207 | } | |
1208 | ||
1209 | #endif /* !SVR4_SHARED_LIBS */ | |
1210 | } | |
1211 | ||
1212 | ||
1213 | /* | |
1214 | ||
1215 | LOCAL FUNCTION | |
f8b76e70 FF |
1216 | |
1217 | sharedlibrary_command -- handle command to explicitly add library | |
1218 | ||
1219 | SYNOPSIS | |
1220 | ||
b0246b3b | 1221 | static void sharedlibrary_command (char *args, int from_tty) |
f8b76e70 FF |
1222 | |
1223 | DESCRIPTION | |
1224 | ||
1225 | */ | |
1226 | ||
b0246b3b | 1227 | static void |
bdbd5f50 | 1228 | sharedlibrary_command (args, from_tty) |
f8b76e70 FF |
1229 | char *args; |
1230 | int from_tty; | |
bdbd5f50 | 1231 | { |
f8b76e70 FF |
1232 | dont_repeat (); |
1233 | solib_add (args, from_tty, (struct target_ops *) 0); | |
bd5635a1 RP |
1234 | } |
1235 | ||
1236 | void | |
1237 | _initialize_solib() | |
1238 | { | |
f8b76e70 FF |
1239 | |
1240 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
bd5635a1 | 1241 | "Load shared object library symbols for files matching REGEXP."); |
f8b76e70 FF |
1242 | add_info ("sharedlibrary", info_sharedlibrary_command, |
1243 | "Status of loaded shared object libraries."); | |
bd5635a1 | 1244 | } |