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