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" | |
a71c0593 | 45 | #include "language.h" |
bdbd5f50 | 46 | |
f8b76e70 FF |
47 | #define MAX_PATH_SIZE 256 /* FIXME: Should be dynamic */ |
48 | ||
a608f919 FF |
49 | /* On SVR4 systems, for the initial implementation, use some runtime startup |
50 | symbol as the "startup mapping complete" breakpoint address. The models | |
51 | for SunOS and SVR4 dynamic linking debugger support are different in that | |
52 | SunOS hits one breakpoint when all mapping is complete while using the SVR4 | |
f8b76e70 FF |
53 | debugger support takes two breakpoint hits for each file mapped, and |
54 | there is no way to know when the "last" one is hit. Both these | |
55 | mechanisms should be tied to a "breakpoint service routine" that | |
56 | gets automatically executed whenever one of the breakpoints indicating | |
57 | a change in mapping is hit. This is a future enhancement. (FIXME) */ | |
58 | ||
a608f919 FF |
59 | #define BKPT_AT_SYMBOL 1 |
60 | ||
a71c0593 | 61 | #if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS) |
a608f919 FF |
62 | static char *bkpt_names[] = { |
63 | #ifdef SOLIB_BKPT_NAME | |
64 | SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ | |
65 | #endif | |
66 | "_start", | |
67 | "main", | |
68 | NULL | |
69 | }; | |
a71c0593 | 70 | #endif |
f8b76e70 | 71 | |
4ad0021e JK |
72 | /* Symbols which are used to locate the base of the link map structures. */ |
73 | ||
74 | static char *debug_base_symbols[] = { | |
75 | #ifdef SVR4_SHARED_LIBS | |
76 | "_r_debug", /* Most SVR4 systems, Solaris 2.1, 2.2 */ | |
77 | "r_debug", /* Solaris 2.3 */ | |
78 | #else | |
79 | "_DYNAMIC", /* SunOS */ | |
80 | #endif | |
81 | NULL | |
82 | }; | |
83 | ||
f8b76e70 FF |
84 | /* local data declarations */ |
85 | ||
d261ece7 | 86 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 | 87 | |
f8b76e70 FF |
88 | #define LM_ADDR(so) ((so) -> lm.lm_addr) |
89 | #define LM_NEXT(so) ((so) -> lm.lm_next) | |
90 | #define LM_NAME(so) ((so) -> lm.lm_name) | |
4ad0021e JK |
91 | /* Test for first link map entry; first entry is a shared library. */ |
92 | #define IGNORE_FIRST_LINK_MAP_ENTRY(x) (0) | |
f8b76e70 FF |
93 | static struct link_dynamic dynamic_copy; |
94 | static struct link_dynamic_2 ld_2_copy; | |
95 | static struct ld_debug debug_copy; | |
96 | static CORE_ADDR debug_addr; | |
97 | static CORE_ADDR flag_addr; | |
98 | ||
d261ece7 | 99 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 100 | |
f8b76e70 FF |
101 | #define LM_ADDR(so) ((so) -> lm.l_addr) |
102 | #define LM_NEXT(so) ((so) -> lm.l_next) | |
103 | #define LM_NAME(so) ((so) -> lm.l_name) | |
4ad0021e JK |
104 | /* Test for first link map entry; first entry is the exec-file. */ |
105 | #define IGNORE_FIRST_LINK_MAP_ENTRY(x) ((x).l_prev == NULL) | |
f8b76e70 | 106 | static struct r_debug debug_copy; |
f8b76e70 | 107 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ |
f8b76e70 | 108 | |
d261ece7 | 109 | #endif /* !SVR4_SHARED_LIBS */ |
bd5635a1 | 110 | |
bd5635a1 | 111 | struct so_list { |
f8b76e70 FF |
112 | struct so_list *next; /* next structure in linked list */ |
113 | struct link_map lm; /* copy of link map from inferior */ | |
114 | struct link_map *lmaddr; /* addr in inferior lm was read from */ | |
115 | CORE_ADDR lmend; /* upper addr bound of mapped object */ | |
116 | char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */ | |
117 | char symbols_loaded; /* flag: symbols read in yet? */ | |
118 | char from_tty; /* flag: print msgs? */ | |
b0246b3b | 119 | struct objfile *objfile; /* objfile for loaded lib */ |
f8b76e70 FF |
120 | struct section_table *sections; |
121 | struct section_table *sections_end; | |
51b57ded | 122 | struct section_table *textsection; |
a71c0593 | 123 | bfd *abfd; |
bd5635a1 RP |
124 | }; |
125 | ||
f8b76e70 FF |
126 | static struct so_list *so_list_head; /* List of known shared objects */ |
127 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ | |
128 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
129 | ||
51b57ded FF |
130 | extern int |
131 | fdmatch PARAMS ((int, int)); /* In libiberty */ | |
132 | ||
b0246b3b FF |
133 | /* Local function prototypes */ |
134 | ||
135 | static void | |
136 | special_symbol_handling PARAMS ((struct so_list *)); | |
137 | ||
138 | static void | |
139 | sharedlibrary_command PARAMS ((char *, int)); | |
140 | ||
141 | static int | |
142 | enable_break PARAMS ((void)); | |
143 | ||
144 | static int | |
145 | disable_break PARAMS ((void)); | |
146 | ||
147 | static void | |
51b57ded | 148 | info_sharedlibrary_command PARAMS ((char *, int)); |
b0246b3b FF |
149 | |
150 | static int | |
151 | symbol_add_stub PARAMS ((char *)); | |
152 | ||
153 | static struct so_list * | |
154 | find_solib PARAMS ((struct so_list *)); | |
155 | ||
156 | static struct link_map * | |
157 | first_link_map_member PARAMS ((void)); | |
158 | ||
159 | static CORE_ADDR | |
160 | locate_base PARAMS ((void)); | |
161 | ||
be772100 JG |
162 | static void |
163 | solib_map_sections PARAMS ((struct so_list *)); | |
164 | ||
165 | #ifdef SVR4_SHARED_LIBS | |
166 | ||
b0246b3b FF |
167 | static int |
168 | look_for_base PARAMS ((int, CORE_ADDR)); | |
169 | ||
170 | static CORE_ADDR | |
171 | bfd_lookup_symbol PARAMS ((bfd *, char *)); | |
172 | ||
be772100 | 173 | #else |
b0246b3b FF |
174 | |
175 | static void | |
176 | solib_add_common_symbols PARAMS ((struct rtc_symb *, struct objfile *)); | |
177 | ||
178 | #endif | |
bd5635a1 | 179 | |
d0237a54 | 180 | /* |
f8b76e70 FF |
181 | |
182 | LOCAL FUNCTION | |
183 | ||
184 | solib_map_sections -- open bfd and build sections for shared lib | |
185 | ||
186 | SYNOPSIS | |
187 | ||
188 | static void solib_map_sections (struct so_list *so) | |
189 | ||
190 | DESCRIPTION | |
191 | ||
192 | Given a pointer to one of the shared objects in our list | |
193 | of mapped objects, use the recorded name to open a bfd | |
194 | descriptor for the object, build a section table, and then | |
195 | relocate all the section addresses by the base address at | |
196 | which the shared object was mapped. | |
197 | ||
198 | FIXMES | |
199 | ||
200 | In most (all?) cases the shared object file name recorded in the | |
201 | dynamic linkage tables will be a fully qualified pathname. For | |
202 | cases where it isn't, do we really mimic the systems search | |
203 | mechanism correctly in the below code (particularly the tilde | |
204 | expansion stuff?). | |
205 | */ | |
206 | ||
d0237a54 | 207 | static void |
f8b76e70 FF |
208 | solib_map_sections (so) |
209 | struct so_list *so; | |
d0237a54 JK |
210 | { |
211 | char *filename; | |
212 | char *scratch_pathname; | |
213 | int scratch_chan; | |
214 | struct section_table *p; | |
de9bef49 JG |
215 | struct cleanup *old_chain; |
216 | bfd *abfd; | |
d0237a54 | 217 | |
f8b76e70 | 218 | filename = tilde_expand (so -> so_name); |
de9bef49 | 219 | old_chain = make_cleanup (free, filename); |
d0237a54 JK |
220 | |
221 | scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, | |
f8b76e70 | 222 | &scratch_pathname); |
d0237a54 | 223 | if (scratch_chan < 0) |
f8b76e70 FF |
224 | { |
225 | scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, | |
226 | O_RDONLY, 0, &scratch_pathname); | |
227 | } | |
d0237a54 | 228 | if (scratch_chan < 0) |
f8b76e70 FF |
229 | { |
230 | perror_with_name (filename); | |
a608f919 | 231 | } |
a71c0593 | 232 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ |
f8b76e70 | 233 | |
a71c0593 | 234 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); |
de9bef49 | 235 | if (!abfd) |
f8b76e70 | 236 | { |
de9bef49 | 237 | close (scratch_chan); |
f8b76e70 | 238 | error ("Could not open `%s' as an executable file: %s", |
4ad0021e | 239 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
f8b76e70 | 240 | } |
a608f919 | 241 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ |
a71c0593 | 242 | so -> abfd = abfd; |
a608f919 | 243 | abfd -> cacheable = true; |
de9bef49 JG |
244 | |
245 | if (!bfd_check_format (abfd, bfd_object)) | |
f8b76e70 FF |
246 | { |
247 | error ("\"%s\": not in executable format: %s.", | |
4ad0021e | 248 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
f8b76e70 | 249 | } |
de9bef49 | 250 | if (build_section_table (abfd, &so -> sections, &so -> sections_end)) |
f8b76e70 FF |
251 | { |
252 | error ("Can't find the file sections in `%s': %s", | |
4ad0021e | 253 | bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ())); |
f8b76e70 FF |
254 | } |
255 | ||
256 | for (p = so -> sections; p < so -> sections_end; p++) | |
257 | { | |
258 | /* Relocate the section binding addresses as recorded in the shared | |
259 | object's file by the base address to which the object was actually | |
260 | mapped. */ | |
261 | p -> addr += (CORE_ADDR) LM_ADDR (so); | |
262 | p -> endaddr += (CORE_ADDR) LM_ADDR (so); | |
263 | so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend); | |
2e4964ad | 264 | if (STREQ (p -> sec_ptr -> name, ".text")) |
51b57ded FF |
265 | { |
266 | so -> textsection = p; | |
267 | } | |
f8b76e70 | 268 | } |
de9bef49 JG |
269 | |
270 | /* Free the file names, close the file now. */ | |
271 | do_cleanups (old_chain); | |
f8b76e70 FF |
272 | } |
273 | ||
d261ece7 | 274 | /* Read all dynamically loaded common symbol definitions from the inferior |
b0246b3b | 275 | and add them to the minimal symbol table for the shared library objfile. */ |
d261ece7 | 276 | |
7f435241 FF |
277 | #ifndef SVR4_SHARED_LIBS |
278 | ||
a71c0593 FF |
279 | /* In GDB 4.9 this routine was a real performance hog. According to |
280 | some gprof data which mtranle@paris.IntelliCorp.COM (Minh Tran-Le) | |
281 | sent, almost all the time spend in solib_add (up to 20 minutes with | |
282 | 35 shared libraries) was spent here, with 5/6 in | |
283 | lookup_minimal_symbol and 1/6 in read_memory. | |
2a4e8cc3 | 284 | |
a71c0593 FF |
285 | To fix this, we moved the call to special_symbol_handling out of the |
286 | loop in solib_add, so this only gets called once, rather than once | |
287 | for every shared library, and also removed the call to lookup_minimal_symbol | |
288 | in this routine. */ | |
2a4e8cc3 | 289 | |
d261ece7 | 290 | static void |
b0246b3b | 291 | solib_add_common_symbols (rtc_symp, objfile) |
d261ece7 | 292 | struct rtc_symb *rtc_symp; |
b0246b3b | 293 | struct objfile *objfile; |
d261ece7 SG |
294 | { |
295 | struct rtc_symb inferior_rtc_symb; | |
296 | struct nlist inferior_rtc_nlist; | |
b0246b3b FF |
297 | int len; |
298 | char *name; | |
299 | char *origname; | |
d261ece7 | 300 | |
b0246b3b FF |
301 | init_minimal_symbol_collection (); |
302 | make_cleanup (discard_minimal_symbols, 0); | |
d261ece7 SG |
303 | |
304 | while (rtc_symp) | |
305 | { | |
b0246b3b FF |
306 | read_memory ((CORE_ADDR) rtc_symp, |
307 | (char *) &inferior_rtc_symb, | |
308 | sizeof (inferior_rtc_symb)); | |
309 | read_memory ((CORE_ADDR) inferior_rtc_symb.rtc_sp, | |
310 | (char *) &inferior_rtc_nlist, | |
311 | sizeof(inferior_rtc_nlist)); | |
312 | if (inferior_rtc_nlist.n_type == N_COMM) | |
313 | { | |
314 | /* FIXME: The length of the symbol name is not available, but in the | |
315 | current implementation the common symbol is allocated immediately | |
316 | behind the name of the symbol. */ | |
317 | len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; | |
318 | ||
319 | origname = name = xmalloc (len); | |
320 | read_memory ((CORE_ADDR) inferior_rtc_nlist.n_un.n_name, name, len); | |
321 | ||
322 | /* Don't enter the symbol twice if the target is re-run. */ | |
d261ece7 | 323 | |
de9bef49 | 324 | if (name[0] == bfd_get_symbol_leading_char (objfile->obfd)) |
b0246b3b FF |
325 | { |
326 | name++; | |
327 | } | |
de9bef49 | 328 | |
a71c0593 FF |
329 | #if 0 |
330 | /* I think this is unnecessary, GDB can probably deal with | |
331 | duplicate minimal symbols, more or less. And the duplication | |
332 | which used to happen because this was called for each shared | |
333 | library is gone now that we are just called once. */ | |
b0246b3b FF |
334 | /* FIXME: Do we really want to exclude symbols which happen |
335 | to match symbols for other locations in the inferior's | |
336 | address space, even when they are in different linkage units? */ | |
337 | if (lookup_minimal_symbol (name, (struct objfile *) NULL) == NULL) | |
a71c0593 | 338 | #endif |
b0246b3b FF |
339 | { |
340 | name = obsavestring (name, strlen (name), | |
341 | &objfile -> symbol_obstack); | |
342 | prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, | |
8d60affd | 343 | mst_bss, objfile); |
b0246b3b FF |
344 | } |
345 | free (origname); | |
346 | } | |
347 | rtc_symp = inferior_rtc_symb.rtc_next; | |
d261ece7 SG |
348 | } |
349 | ||
b0246b3b FF |
350 | /* Install any minimal symbols that have been collected as the current |
351 | minimal symbols for this objfile. */ | |
352 | ||
353 | install_minimal_symbols (objfile); | |
d261ece7 SG |
354 | } |
355 | ||
7f435241 FF |
356 | #endif /* SVR4_SHARED_LIBS */ |
357 | ||
be772100 JG |
358 | #ifdef SVR4_SHARED_LIBS |
359 | ||
f8b76e70 FF |
360 | /* |
361 | ||
362 | LOCAL FUNCTION | |
363 | ||
364 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
365 | ||
366 | SYNOPSIS | |
367 | ||
368 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) | |
369 | ||
370 | DESCRIPTION | |
371 | ||
372 | An expensive way to lookup the value of a single symbol for | |
373 | bfd's that are only temporary anyway. This is used by the | |
374 | shared library support to find the address of the debugger | |
375 | interface structures in the shared library. | |
376 | ||
377 | Note that 0 is specifically allowed as an error return (no | |
378 | such symbol). | |
379 | ||
380 | FIXME: See if there is a less "expensive" way of doing this. | |
381 | Also see if there is already another bfd or gdb function | |
382 | that specifically does this, and if so, use it. | |
383 | */ | |
384 | ||
385 | static CORE_ADDR | |
b0246b3b FF |
386 | bfd_lookup_symbol (abfd, symname) |
387 | bfd *abfd; | |
388 | char *symname; | |
f8b76e70 FF |
389 | { |
390 | unsigned int storage_needed; | |
391 | asymbol *sym; | |
392 | asymbol **symbol_table; | |
393 | unsigned int number_of_symbols; | |
394 | unsigned int i; | |
395 | struct cleanup *back_to; | |
396 | CORE_ADDR symaddr = 0; | |
f8b76e70 FF |
397 | |
398 | storage_needed = get_symtab_upper_bound (abfd); | |
399 | ||
400 | if (storage_needed > 0) | |
401 | { | |
be772100 JG |
402 | symbol_table = (asymbol **) xmalloc (storage_needed); |
403 | back_to = make_cleanup (free, (PTR)symbol_table); | |
f8b76e70 FF |
404 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
405 | ||
406 | for (i = 0; i < number_of_symbols; i++) | |
d0237a54 | 407 | { |
f8b76e70 | 408 | sym = *symbol_table++; |
2e4964ad | 409 | if (STREQ (sym -> name, symname)) |
f8b76e70 | 410 | { |
a608f919 FF |
411 | /* Bfd symbols are section relative. */ |
412 | symaddr = sym -> value + sym -> section -> vma; | |
f8b76e70 FF |
413 | break; |
414 | } | |
d0237a54 | 415 | } |
f8b76e70 | 416 | do_cleanups (back_to); |
d0237a54 | 417 | } |
f8b76e70 | 418 | return (symaddr); |
d0237a54 JK |
419 | } |
420 | ||
f8b76e70 FF |
421 | /* |
422 | ||
d261ece7 SG |
423 | LOCAL FUNCTION |
424 | ||
425 | look_for_base -- examine file for each mapped address segment | |
426 | ||
427 | SYNOPSYS | |
428 | ||
429 | static int look_for_base (int fd, CORE_ADDR baseaddr) | |
430 | ||
431 | DESCRIPTION | |
432 | ||
433 | This function is passed to proc_iterate_over_mappings, which | |
434 | causes it to get called once for each mapped address space, with | |
435 | an open file descriptor for the file mapped to that space, and the | |
436 | base address of that mapped space. | |
437 | ||
4ad0021e | 438 | Our job is to find the debug base symbol in the file that this |
d261ece7 SG |
439 | fd is open on, if it exists, and if so, initialize the dynamic |
440 | linker structure base address debug_base. | |
441 | ||
442 | Note that this is a computationally expensive proposition, since | |
443 | we basically have to open a bfd on every call, so we specifically | |
444 | avoid opening the exec file. | |
445 | */ | |
446 | ||
447 | static int | |
b0246b3b FF |
448 | look_for_base (fd, baseaddr) |
449 | int fd; | |
450 | CORE_ADDR baseaddr; | |
d261ece7 SG |
451 | { |
452 | bfd *interp_bfd; | |
453 | CORE_ADDR address; | |
4ad0021e | 454 | char **symbolp; |
d261ece7 SG |
455 | |
456 | /* If the fd is -1, then there is no file that corresponds to this | |
457 | mapped memory segment, so skip it. Also, if the fd corresponds | |
458 | to the exec file, skip it as well. */ | |
459 | ||
8d60affd | 460 | if ((fd == -1) || fdmatch (fileno ((GDB_FILE *)(exec_bfd -> iostream)), fd)) |
d261ece7 SG |
461 | { |
462 | return (0); | |
463 | } | |
464 | ||
465 | /* Try to open whatever random file this fd corresponds to. Note that | |
466 | we have no way currently to find the filename. Don't gripe about | |
467 | any problems we might have, just fail. */ | |
468 | ||
a71c0593 | 469 | if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL) |
d261ece7 SG |
470 | { |
471 | return (0); | |
472 | } | |
473 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
474 | { | |
475 | bfd_close (interp_bfd); | |
476 | return (0); | |
477 | } | |
478 | ||
4ad0021e | 479 | /* Now try to find our debug base symbol in this file, which we at |
d261ece7 SG |
480 | least know to be a valid ELF executable or shared library. */ |
481 | ||
4ad0021e JK |
482 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) |
483 | { | |
484 | address = bfd_lookup_symbol (interp_bfd, *symbolp); | |
485 | if (address != 0) | |
486 | { | |
487 | break; | |
488 | } | |
489 | } | |
490 | if (address == 0) | |
d261ece7 SG |
491 | { |
492 | bfd_close (interp_bfd); | |
493 | return (0); | |
494 | } | |
495 | ||
496 | /* Eureka! We found the symbol. But now we may need to relocate it | |
497 | by the base address. If the symbol's value is less than the base | |
498 | address of the shared library, then it hasn't yet been relocated | |
499 | by the dynamic linker, and we have to do it ourself. FIXME: Note | |
500 | that we make the assumption that the first segment that corresponds | |
501 | to the shared library has the base address to which the library | |
502 | was relocated. */ | |
503 | ||
504 | if (address < baseaddr) | |
505 | { | |
506 | address += baseaddr; | |
507 | } | |
508 | debug_base = address; | |
509 | bfd_close (interp_bfd); | |
510 | return (1); | |
511 | } | |
512 | ||
be772100 JG |
513 | #endif |
514 | ||
d261ece7 SG |
515 | /* |
516 | ||
f8b76e70 FF |
517 | LOCAL FUNCTION |
518 | ||
519 | locate_base -- locate the base address of dynamic linker structs | |
520 | ||
521 | SYNOPSIS | |
522 | ||
523 | CORE_ADDR locate_base (void) | |
524 | ||
525 | DESCRIPTION | |
526 | ||
527 | For both the SunOS and SVR4 shared library implementations, if the | |
528 | inferior executable has been linked dynamically, there is a single | |
529 | address somewhere in the inferior's data space which is the key to | |
d261ece7 | 530 | locating all of the dynamic linker's runtime structures. This |
4ad0021e JK |
531 | address is the value of the debug base symbol. The job of this |
532 | function is to find and return that address, or to return 0 if there | |
533 | is no such address (the executable is statically linked for example). | |
f8b76e70 FF |
534 | |
535 | For SunOS, the job is almost trivial, since the dynamic linker and | |
536 | all of it's structures are statically linked to the executable at | |
537 | link time. Thus the symbol for the address we are looking for has | |
b0246b3b FF |
538 | already been added to the minimal symbol table for the executable's |
539 | objfile at the time the symbol file's symbols were read, and all we | |
540 | have to do is look it up there. Note that we explicitly do NOT want | |
541 | to find the copies in the shared library. | |
f8b76e70 FF |
542 | |
543 | The SVR4 version is much more complicated because the dynamic linker | |
d261ece7 SG |
544 | and it's structures are located in the shared C library, which gets |
545 | run as the executable's "interpreter" by the kernel. We have to go | |
4ad0021e JK |
546 | to a lot more work to discover the address of the debug base symbol. |
547 | Because of this complexity, we cache the value we find and return that | |
548 | value on subsequent invocations. Note there is no copy in the | |
549 | executable symbol tables. | |
f8b76e70 | 550 | |
d261ece7 SG |
551 | Note that we can assume nothing about the process state at the time |
552 | we need to find this address. We may be stopped on the first instruc- | |
553 | tion of the interpreter (C shared library), the first instruction of | |
554 | the executable itself, or somewhere else entirely (if we attached | |
555 | to the process for example). | |
f8b76e70 FF |
556 | |
557 | */ | |
558 | ||
559 | static CORE_ADDR | |
560 | locate_base () | |
561 | { | |
f8b76e70 | 562 | |
d261ece7 | 563 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 | 564 | |
b0246b3b | 565 | struct minimal_symbol *msymbol; |
d261ece7 | 566 | CORE_ADDR address = 0; |
4ad0021e | 567 | char **symbolp; |
f8b76e70 | 568 | |
4ad0021e JK |
569 | /* For SunOS, we want to limit the search for the debug base symbol to the |
570 | executable being debugged, since there is a duplicate named symbol in the | |
571 | shared library. We don't want the shared library versions. */ | |
b0246b3b | 572 | |
4ad0021e | 573 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) |
f8b76e70 | 574 | { |
4ad0021e JK |
575 | msymbol = lookup_minimal_symbol (*symbolp, symfile_objfile); |
576 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
577 | { | |
578 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
579 | return (address); | |
580 | } | |
f8b76e70 | 581 | } |
4ad0021e | 582 | return (0); |
f8b76e70 | 583 | |
d261ece7 | 584 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 585 | |
d261ece7 SG |
586 | /* Check to see if we have a currently valid address, and if so, avoid |
587 | doing all this work again and just return the cached address. If | |
588 | we have no cached address, ask the /proc support interface to iterate | |
589 | over the list of mapped address segments, calling look_for_base() for | |
590 | each segment. When we are done, we will have either found the base | |
591 | address or not. */ | |
f8b76e70 | 592 | |
d261ece7 | 593 | if (debug_base == 0) |
f8b76e70 | 594 | { |
d261ece7 | 595 | proc_iterate_over_mappings (look_for_base); |
f8b76e70 | 596 | } |
d261ece7 | 597 | return (debug_base); |
f8b76e70 | 598 | |
d261ece7 | 599 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
600 | |
601 | } | |
bd5635a1 | 602 | |
a608f919 FF |
603 | /* |
604 | ||
605 | LOCAL FUNCTION | |
606 | ||
607 | first_link_map_member -- locate first member in dynamic linker's map | |
608 | ||
609 | SYNOPSIS | |
610 | ||
611 | static struct link_map *first_link_map_member (void) | |
612 | ||
613 | DESCRIPTION | |
614 | ||
615 | Read in a copy of the first member in the inferior's dynamic | |
616 | link map from the inferior's dynamic linker structures, and return | |
617 | a pointer to the copy in our address space. | |
618 | */ | |
619 | ||
f8b76e70 FF |
620 | static struct link_map * |
621 | first_link_map_member () | |
bd5635a1 | 622 | { |
f8b76e70 FF |
623 | struct link_map *lm = NULL; |
624 | ||
d261ece7 | 625 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 | 626 | |
b0246b3b | 627 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); |
f8b76e70 FF |
628 | if (dynamic_copy.ld_version >= 2) |
629 | { | |
630 | /* It is a version that we can deal with, so read in the secondary | |
631 | structure and find the address of the link map list from it. */ | |
b0246b3b | 632 | read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, (char *) &ld_2_copy, |
f8b76e70 FF |
633 | sizeof (struct link_dynamic_2)); |
634 | lm = ld_2_copy.ld_loaded; | |
635 | } | |
636 | ||
d261ece7 | 637 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 638 | |
b0246b3b | 639 | read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug)); |
a608f919 FF |
640 | /* FIXME: Perhaps we should validate the info somehow, perhaps by |
641 | checking r_version for a known version number, or r_state for | |
642 | RT_CONSISTENT. */ | |
f8b76e70 FF |
643 | lm = debug_copy.r_map; |
644 | ||
d261ece7 | 645 | #endif /* !SVR4_SHARED_LIBS */ |
d0237a54 | 646 | |
f8b76e70 FF |
647 | return (lm); |
648 | } | |
649 | ||
650 | /* | |
651 | ||
b0246b3b | 652 | LOCAL FUNCTION |
f8b76e70 FF |
653 | |
654 | find_solib -- step through list of shared objects | |
655 | ||
656 | SYNOPSIS | |
657 | ||
658 | struct so_list *find_solib (struct so_list *so_list_ptr) | |
659 | ||
660 | DESCRIPTION | |
661 | ||
662 | This module contains the routine which finds the names of any | |
663 | loaded "images" in the current process. The argument in must be | |
664 | NULL on the first call, and then the returned value must be passed | |
665 | in on subsequent calls. This provides the capability to "step" down | |
666 | the list of loaded objects. On the last object, a NULL value is | |
667 | returned. | |
d0237a54 | 668 | |
f8b76e70 FF |
669 | The arg and return value are "struct link_map" pointers, as defined |
670 | in <link.h>. | |
671 | */ | |
d0237a54 | 672 | |
b0246b3b | 673 | static struct so_list * |
f8b76e70 FF |
674 | find_solib (so_list_ptr) |
675 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ | |
676 | { | |
677 | struct so_list *so_list_next = NULL; | |
678 | struct link_map *lm = NULL; | |
679 | struct so_list *new; | |
680 | ||
681 | if (so_list_ptr == NULL) | |
682 | { | |
683 | /* We are setting up for a new scan through the loaded images. */ | |
684 | if ((so_list_next = so_list_head) == NULL) | |
685 | { | |
686 | /* We have not already read in the dynamic linking structures | |
687 | from the inferior, lookup the address of the base structure. */ | |
688 | debug_base = locate_base (); | |
a608f919 | 689 | if (debug_base != 0) |
f8b76e70 FF |
690 | { |
691 | /* Read the base structure in and find the address of the first | |
692 | link map list member. */ | |
693 | lm = first_link_map_member (); | |
694 | } | |
695 | } | |
696 | } | |
697 | else | |
698 | { | |
699 | /* We have been called before, and are in the process of walking | |
700 | the shared library list. Advance to the next shared object. */ | |
701 | if ((lm = LM_NEXT (so_list_ptr)) == NULL) | |
702 | { | |
703 | /* We have hit the end of the list, so check to see if any were | |
704 | added, but be quiet if we can't read from the target any more. */ | |
705 | int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lmaddr, | |
706 | (char *) &(so_list_ptr -> lm), | |
707 | sizeof (struct link_map)); | |
708 | if (status == 0) | |
709 | { | |
710 | lm = LM_NEXT (so_list_ptr); | |
711 | } | |
712 | else | |
713 | { | |
714 | lm = NULL; | |
715 | } | |
716 | } | |
717 | so_list_next = so_list_ptr -> next; | |
718 | } | |
719 | if ((so_list_next == NULL) && (lm != NULL)) | |
720 | { | |
721 | /* Get next link map structure from inferior image and build a local | |
722 | abbreviated load_map structure */ | |
723 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
de9bef49 | 724 | memset ((char *) new, 0, sizeof (struct so_list)); |
f8b76e70 FF |
725 | new -> lmaddr = lm; |
726 | /* Add the new node as the next node in the list, or as the root | |
727 | node if this is the first one. */ | |
728 | if (so_list_ptr != NULL) | |
729 | { | |
730 | so_list_ptr -> next = new; | |
731 | } | |
732 | else | |
733 | { | |
734 | so_list_head = new; | |
735 | } | |
736 | so_list_next = new; | |
b0246b3b FF |
737 | read_memory ((CORE_ADDR) lm, (char *) &(new -> lm), |
738 | sizeof (struct link_map)); | |
4ad0021e JK |
739 | /* For SVR4 versions, the first entry in the link map is for the |
740 | inferior executable, so we must ignore it. For some versions of | |
741 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
742 | does have a name, so we can no longer use a missing name to | |
743 | decide when to ignore it. */ | |
744 | if (!IGNORE_FIRST_LINK_MAP_ENTRY (new -> lm)) | |
f8b76e70 | 745 | { |
4ad0021e JK |
746 | int errcode; |
747 | char *buffer; | |
748 | target_read_string ((CORE_ADDR) LM_NAME (new), &buffer, | |
749 | MAX_PATH_SIZE - 1, &errcode); | |
750 | if (errcode != 0) | |
751 | error ("find_solib: Can't read pathname for load map: %s\n", | |
752 | safe_strerror (errcode)); | |
753 | strncpy (new -> so_name, buffer, MAX_PATH_SIZE - 1); | |
754 | new -> so_name[MAX_PATH_SIZE - 1] = '\0'; | |
755 | free (buffer); | |
f8b76e70 FF |
756 | solib_map_sections (new); |
757 | } | |
758 | } | |
759 | return (so_list_next); | |
bd5635a1 | 760 | } |
d0237a54 | 761 | |
bdbd5f50 JG |
762 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
763 | ||
764 | static int | |
765 | symbol_add_stub (arg) | |
766 | char *arg; | |
d0237a54 | 767 | { |
f8b76e70 FF |
768 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
769 | ||
b0246b3b | 770 | so -> objfile = symbol_file_add (so -> so_name, so -> from_tty, |
51b57ded FF |
771 | (unsigned int) so -> textsection -> addr, |
772 | 0, 0, 0); | |
f8b76e70 | 773 | return (1); |
d0237a54 | 774 | } |
bd5635a1 | 775 | |
f8b76e70 FF |
776 | /* |
777 | ||
778 | GLOBAL FUNCTION | |
779 | ||
780 | solib_add -- add a shared library file to the symtab and section list | |
781 | ||
782 | SYNOPSIS | |
783 | ||
784 | void solib_add (char *arg_string, int from_tty, | |
785 | struct target_ops *target) | |
786 | ||
787 | DESCRIPTION | |
788 | ||
789 | */ | |
bdbd5f50 JG |
790 | |
791 | void | |
792 | solib_add (arg_string, from_tty, target) | |
793 | char *arg_string; | |
794 | int from_tty; | |
795 | struct target_ops *target; | |
bd5635a1 | 796 | { |
f8b76e70 | 797 | register struct so_list *so = NULL; /* link map state variable */ |
a71c0593 FF |
798 | |
799 | /* Last shared library that we read. */ | |
800 | struct so_list *so_last = NULL; | |
801 | ||
f8b76e70 FF |
802 | char *re_err; |
803 | int count; | |
804 | int old; | |
805 | ||
806 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) | |
807 | { | |
808 | error ("Invalid regexp: %s", re_err); | |
809 | } | |
810 | ||
bdbd5f50 JG |
811 | /* Getting new symbols may change our opinion about what is |
812 | frameless. */ | |
813 | reinit_frame_cache (); | |
bdbd5f50 | 814 | |
f8b76e70 FF |
815 | while ((so = find_solib (so)) != NULL) |
816 | { | |
817 | if (so -> so_name[0] && re_exec (so -> so_name)) | |
818 | { | |
a608f919 | 819 | so -> from_tty = from_tty; |
f8b76e70 FF |
820 | if (so -> symbols_loaded) |
821 | { | |
bdbd5f50 | 822 | if (from_tty) |
f8b76e70 | 823 | { |
8d60affd | 824 | printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name); |
f8b76e70 FF |
825 | } |
826 | } | |
a608f919 FF |
827 | else if (catch_errors |
828 | (symbol_add_stub, (char *) so, | |
9748446f JK |
829 | "Error while reading shared library symbols:\n", |
830 | RETURN_MASK_ALL)) | |
f8b76e70 | 831 | { |
a71c0593 | 832 | so_last = so; |
b0246b3b | 833 | so -> symbols_loaded = 1; |
f8b76e70 FF |
834 | } |
835 | } | |
836 | } | |
837 | ||
bdbd5f50 JG |
838 | /* Now add the shared library sections to the section table of the |
839 | specified target, if any. */ | |
f8b76e70 FF |
840 | if (target) |
841 | { | |
842 | /* Count how many new section_table entries there are. */ | |
843 | so = NULL; | |
844 | count = 0; | |
845 | while ((so = find_solib (so)) != NULL) | |
846 | { | |
847 | if (so -> so_name[0]) | |
848 | { | |
849 | count += so -> sections_end - so -> sections; | |
850 | } | |
851 | } | |
852 | ||
853 | if (count) | |
854 | { | |
855 | /* Reallocate the target's section table including the new size. */ | |
ee0613d1 | 856 | if (target -> to_sections) |
f8b76e70 | 857 | { |
ee0613d1 JG |
858 | old = target -> to_sections_end - target -> to_sections; |
859 | target -> to_sections = (struct section_table *) | |
a71c0593 | 860 | xrealloc ((char *)target -> to_sections, |
f8b76e70 FF |
861 | (sizeof (struct section_table)) * (count + old)); |
862 | } | |
863 | else | |
864 | { | |
865 | old = 0; | |
ee0613d1 | 866 | target -> to_sections = (struct section_table *) |
a71c0593 | 867 | xmalloc ((sizeof (struct section_table)) * count); |
f8b76e70 | 868 | } |
ee0613d1 | 869 | target -> to_sections_end = target -> to_sections + (count + old); |
f8b76e70 FF |
870 | |
871 | /* Add these section table entries to the target's table. */ | |
872 | while ((so = find_solib (so)) != NULL) | |
873 | { | |
874 | if (so -> so_name[0]) | |
875 | { | |
876 | count = so -> sections_end - so -> sections; | |
de9bef49 JG |
877 | memcpy ((char *) (target -> to_sections + old), |
878 | so -> sections, | |
879 | (sizeof (struct section_table)) * count); | |
f8b76e70 FF |
880 | old += count; |
881 | } | |
882 | } | |
883 | } | |
884 | } | |
a71c0593 FF |
885 | |
886 | /* Calling this once at the end means that we put all the minimal | |
887 | symbols for commons into the objfile for the last shared library. | |
888 | Since they are in common, this should not be a problem. If we | |
889 | delete the objfile with the minimal symbols, we can put all the | |
890 | symbols into a new objfile (and will on the next call to solib_add). | |
891 | ||
892 | An alternate approach would be to create an objfile just for | |
893 | common minsyms, thus not needing any objfile argument to | |
894 | solib_add_common_symbols. */ | |
895 | ||
896 | if (so_last) | |
897 | special_symbol_handling (so_last); | |
bd5635a1 | 898 | } |
bdbd5f50 | 899 | |
f8b76e70 | 900 | /* |
bd5635a1 | 901 | |
f8b76e70 FF |
902 | LOCAL FUNCTION |
903 | ||
904 | info_sharedlibrary_command -- code for "info sharedlibrary" | |
905 | ||
906 | SYNOPSIS | |
907 | ||
908 | static void info_sharedlibrary_command () | |
909 | ||
910 | DESCRIPTION | |
bd5635a1 | 911 | |
f8b76e70 FF |
912 | Walk through the shared library list and print information |
913 | about each attached library. | |
914 | */ | |
915 | ||
916 | static void | |
51b57ded FF |
917 | info_sharedlibrary_command (ignore, from_tty) |
918 | char *ignore; | |
919 | int from_tty; | |
f8b76e70 FF |
920 | { |
921 | register struct so_list *so = NULL; /* link map state variable */ | |
922 | int header_done = 0; | |
923 | ||
924 | if (exec_bfd == NULL) | |
925 | { | |
8d60affd | 926 | printf_unfiltered ("No exec file.\n"); |
f8b76e70 FF |
927 | return; |
928 | } | |
929 | while ((so = find_solib (so)) != NULL) | |
930 | { | |
931 | if (so -> so_name[0]) | |
932 | { | |
933 | if (!header_done) | |
934 | { | |
8d60affd | 935 | printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", |
f8b76e70 FF |
936 | "Shared Object Library"); |
937 | header_done++; | |
938 | } | |
4ad0021e JK |
939 | /* FIXME-32x64: need print_address_numeric with field width or |
940 | some such. */ | |
8d60affd | 941 | printf_unfiltered ("%-12s", |
a71c0593 FF |
942 | local_hex_string_custom ((unsigned long) LM_ADDR (so), |
943 | "08l")); | |
8d60affd | 944 | printf_unfiltered ("%-12s", |
a71c0593 FF |
945 | local_hex_string_custom ((unsigned long) so -> lmend, |
946 | "08l")); | |
8d60affd JK |
947 | printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No"); |
948 | printf_unfiltered ("%s\n", so -> so_name); | |
bd5635a1 | 949 | } |
bd5635a1 | 950 | } |
f8b76e70 FF |
951 | if (so_list_head == NULL) |
952 | { | |
8d60affd | 953 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
bd5635a1 RP |
954 | } |
955 | } | |
956 | ||
957 | /* | |
f8b76e70 FF |
958 | |
959 | GLOBAL FUNCTION | |
960 | ||
961 | solib_address -- check to see if an address is in a shared lib | |
962 | ||
963 | SYNOPSIS | |
964 | ||
965 | int solib_address (CORE_ADDR address) | |
966 | ||
967 | DESCRIPTION | |
968 | ||
969 | Provides a hook for other gdb routines to discover whether or | |
970 | not a particular address is within the mapped address space of | |
971 | a shared library. Any address between the base mapping address | |
972 | and the first address beyond the end of the last mapping, is | |
973 | considered to be within the shared library address space, for | |
974 | our purposes. | |
975 | ||
976 | For example, this routine is called at one point to disable | |
977 | breakpoints which are in shared libraries that are not currently | |
978 | mapped in. | |
979 | */ | |
980 | ||
bd5635a1 | 981 | int |
f8b76e70 | 982 | solib_address (address) |
bd5635a1 RP |
983 | CORE_ADDR address; |
984 | { | |
f8b76e70 FF |
985 | register struct so_list *so = 0; /* link map state variable */ |
986 | ||
987 | while ((so = find_solib (so)) != NULL) | |
988 | { | |
989 | if (so -> so_name[0]) | |
990 | { | |
991 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && | |
992 | (address < (CORE_ADDR) so -> lmend)) | |
993 | { | |
994 | return (1); | |
995 | } | |
996 | } | |
997 | } | |
998 | return (0); | |
999 | } | |
1000 | ||
1001 | /* Called by free_all_symtabs */ | |
bd5635a1 | 1002 | |
f8b76e70 FF |
1003 | void |
1004 | clear_solib() | |
1005 | { | |
1006 | struct so_list *next; | |
a608f919 | 1007 | char *bfd_filename; |
f8b76e70 FF |
1008 | |
1009 | while (so_list_head) | |
1010 | { | |
1011 | if (so_list_head -> sections) | |
1012 | { | |
be772100 | 1013 | free ((PTR)so_list_head -> sections); |
f8b76e70 | 1014 | } |
a71c0593 | 1015 | if (so_list_head -> abfd) |
a608f919 | 1016 | { |
a71c0593 FF |
1017 | bfd_filename = bfd_get_filename (so_list_head -> abfd); |
1018 | bfd_close (so_list_head -> abfd); | |
a608f919 FF |
1019 | } |
1020 | else | |
1021 | /* This happens for the executable on SVR4. */ | |
1022 | bfd_filename = NULL; | |
1023 | ||
f8b76e70 | 1024 | next = so_list_head -> next; |
a608f919 FF |
1025 | if (bfd_filename) |
1026 | free ((PTR)bfd_filename); | |
1027 | free ((PTR)so_list_head); | |
f8b76e70 | 1028 | so_list_head = next; |
bd5635a1 | 1029 | } |
f8b76e70 | 1030 | debug_base = 0; |
bd5635a1 RP |
1031 | } |
1032 | ||
1033 | /* | |
f8b76e70 FF |
1034 | |
1035 | LOCAL FUNCTION | |
1036 | ||
1037 | disable_break -- remove the "mapping changed" breakpoint | |
1038 | ||
1039 | SYNOPSIS | |
1040 | ||
1041 | static int disable_break () | |
1042 | ||
1043 | DESCRIPTION | |
1044 | ||
1045 | Removes the breakpoint that gets hit when the dynamic linker | |
1046 | completes a mapping change. | |
1047 | ||
bd5635a1 | 1048 | */ |
f8b76e70 FF |
1049 | |
1050 | static int | |
1051 | disable_break () | |
bd5635a1 | 1052 | { |
f8b76e70 FF |
1053 | int status = 1; |
1054 | ||
d261ece7 | 1055 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 FF |
1056 | |
1057 | int in_debugger = 0; | |
1058 | ||
f8b76e70 FF |
1059 | /* Read the debugger structure from the inferior to retrieve the |
1060 | address of the breakpoint and the original contents of the | |
1061 | breakpoint address. Remove the breakpoint by writing the original | |
1062 | contents back. */ | |
1063 | ||
b0246b3b | 1064 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); |
d261ece7 SG |
1065 | |
1066 | /* Set `in_debugger' to zero now. */ | |
1067 | ||
b0246b3b | 1068 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); |
d261ece7 | 1069 | |
f8b76e70 | 1070 | breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr; |
b0246b3b | 1071 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, |
f8b76e70 FF |
1072 | sizeof (debug_copy.ldd_bp_inst)); |
1073 | ||
d261ece7 | 1074 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 FF |
1075 | |
1076 | /* Note that breakpoint address and original contents are in our address | |
1077 | space, so we just need to write the original contents back. */ | |
1078 | ||
1079 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
1080 | { | |
1081 | status = 0; | |
1082 | } | |
1083 | ||
d261ece7 | 1084 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
1085 | |
1086 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1087 | SunOS version we don't know it until the above code is executed. | |
1088 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1089 | ||
1090 | if (stop_pc != breakpoint_addr) | |
1091 | { | |
1092 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1093 | } | |
1094 | ||
1095 | return (status); | |
bdbd5f50 JG |
1096 | } |
1097 | ||
f8b76e70 | 1098 | /* |
bdbd5f50 | 1099 | |
f8b76e70 FF |
1100 | LOCAL FUNCTION |
1101 | ||
1102 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1103 | ||
1104 | SYNOPSIS | |
1105 | ||
1106 | int enable_break (void) | |
1107 | ||
1108 | DESCRIPTION | |
1109 | ||
1110 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1111 | debugger interface, support for arranging for the inferior to hit | |
1112 | a breakpoint after mapping in the shared libraries. This function | |
1113 | enables that breakpoint. | |
1114 | ||
1115 | For SunOS, there is a special flag location (in_debugger) which we | |
1116 | set to 1. When the dynamic linker sees this flag set, it will set | |
1117 | a breakpoint at a location known only to itself, after saving the | |
1118 | original contents of that place and the breakpoint address itself, | |
1119 | in it's own internal structures. When we resume the inferior, it | |
1120 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1121 | We handle this (in a different place) by restoring the contents of | |
1122 | the breakpointed location (which is only known after it stops), | |
1123 | chasing around to locate the shared libraries that have been | |
1124 | loaded, then resuming. | |
1125 | ||
1126 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1127 | which is statically initialized at the time the shared library is | |
1128 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1129 | teed to be called once before mapping in a library, and again when | |
1130 | the mapping is complete. At the time we are examining this member, | |
1131 | it contains only the unrelocated offset of the function, so we have | |
1132 | to do our own relocation. Later, when the dynamic linker actually | |
1133 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1134 | ||
1135 | The debugger interface structure also contains an enumeration which | |
1136 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1137 | depending upon whether or not the library is being mapped or unmapped, | |
1138 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1139 | */ | |
1140 | ||
1141 | static int | |
1142 | enable_break () | |
bdbd5f50 | 1143 | { |
a608f919 | 1144 | int success = 0; |
bdbd5f50 | 1145 | |
d261ece7 | 1146 | #ifndef SVR4_SHARED_LIBS |
bdbd5f50 | 1147 | |
51b57ded | 1148 | int j; |
f8b76e70 | 1149 | int in_debugger; |
51b57ded | 1150 | |
bdbd5f50 | 1151 | /* Get link_dynamic structure */ |
f8b76e70 FF |
1152 | |
1153 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1154 | sizeof (dynamic_copy)); | |
1155 | if (j) | |
1156 | { | |
1157 | /* unreadable */ | |
1158 | return (0); | |
1159 | } | |
06b6c733 | 1160 | |
bdbd5f50 | 1161 | /* Calc address of debugger interface structure */ |
f8b76e70 FF |
1162 | |
1163 | debug_addr = (CORE_ADDR) dynamic_copy.ldd; | |
1164 | ||
bdbd5f50 | 1165 | /* Calc address of `in_debugger' member of debugger interface structure */ |
f8b76e70 FF |
1166 | |
1167 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
1168 | (char *) &debug_copy); | |
1169 | ||
bdbd5f50 | 1170 | /* Write a value of 1 to this member. */ |
f8b76e70 | 1171 | |
bdbd5f50 | 1172 | in_debugger = 1; |
b0246b3b | 1173 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); |
a608f919 | 1174 | success = 1; |
f8b76e70 | 1175 | |
d261ece7 | 1176 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 1177 | |
a608f919 | 1178 | #ifdef BKPT_AT_SYMBOL |
f8b76e70 | 1179 | |
b0246b3b | 1180 | struct minimal_symbol *msymbol; |
a608f919 FF |
1181 | char **bkpt_namep; |
1182 | CORE_ADDR bkpt_addr; | |
f8b76e70 | 1183 | |
a608f919 FF |
1184 | /* Scan through the list of symbols, trying to look up the symbol and |
1185 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
f8b76e70 | 1186 | |
a608f919 FF |
1187 | breakpoint_addr = 0; |
1188 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
f8b76e70 | 1189 | { |
a608f919 FF |
1190 | msymbol = lookup_minimal_symbol (*bkpt_namep, symfile_objfile); |
1191 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1192 | { | |
1193 | bkpt_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
1194 | if (target_insert_breakpoint (bkpt_addr, shadow_contents) == 0) | |
1195 | { | |
1196 | breakpoint_addr = bkpt_addr; | |
1197 | success = 1; | |
1198 | break; | |
1199 | } | |
1200 | } | |
f8b76e70 FF |
1201 | } |
1202 | ||
a608f919 | 1203 | #else /* !BKPT_AT_SYMBOL */ |
f8b76e70 FF |
1204 | |
1205 | struct symtab_and_line sal; | |
1206 | ||
1207 | /* Read the debugger interface structure directly. */ | |
1208 | ||
1209 | read_memory (debug_base, (char *) &debug_copy, sizeof (debug_copy)); | |
1210 | ||
1211 | /* Set breakpoint at the debugger interface stub routine that will | |
1212 | be called just prior to each mapping change and again after the | |
1213 | mapping change is complete. Set up the (nonexistent) handler to | |
1214 | deal with hitting these breakpoints. (FIXME). */ | |
1215 | ||
1216 | warning ("'%s': line %d: missing SVR4 support code", __FILE__, __LINE__); | |
a608f919 | 1217 | success = 1; |
f8b76e70 | 1218 | |
a608f919 | 1219 | #endif /* BKPT_AT_SYMBOL */ |
f8b76e70 | 1220 | |
d261ece7 | 1221 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 | 1222 | |
a608f919 | 1223 | return (success); |
f8b76e70 FF |
1224 | } |
1225 | ||
1226 | /* | |
1227 | ||
1228 | GLOBAL FUNCTION | |
1229 | ||
1230 | solib_create_inferior_hook -- shared library startup support | |
1231 | ||
1232 | SYNOPSIS | |
1233 | ||
1234 | void solib_create_inferior_hook() | |
1235 | ||
1236 | DESCRIPTION | |
1237 | ||
1238 | When gdb starts up the inferior, it nurses it along (through the | |
1239 | shell) until it is ready to execute it's first instruction. At this | |
1240 | point, this function gets called via expansion of the macro | |
1241 | SOLIB_CREATE_INFERIOR_HOOK. | |
1242 | ||
a608f919 FF |
1243 | For SunOS executables, this first instruction is typically the |
1244 | one at "_start", or a similar text label, regardless of whether | |
1245 | the executable is statically or dynamically linked. The runtime | |
1246 | startup code takes care of dynamically linking in any shared | |
1247 | libraries, once gdb allows the inferior to continue. | |
1248 | ||
1249 | For SVR4 executables, this first instruction is either the first | |
1250 | instruction in the dynamic linker (for dynamically linked | |
1251 | executables) or the instruction at "start" for statically linked | |
1252 | executables. For dynamically linked executables, the system | |
1253 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1254 | and starts it running. The dynamic linker maps in any needed | |
1255 | shared libraries, maps in the actual user executable, and then | |
1256 | jumps to "start" in the user executable. | |
1257 | ||
f8b76e70 FF |
1258 | For both SunOS shared libraries, and SVR4 shared libraries, we |
1259 | can arrange to cooperate with the dynamic linker to discover the | |
1260 | names of shared libraries that are dynamically linked, and the | |
1261 | base addresses to which they are linked. | |
1262 | ||
1263 | This function is responsible for discovering those names and | |
1264 | addresses, and saving sufficient information about them to allow | |
1265 | their symbols to be read at a later time. | |
1266 | ||
1267 | FIXME | |
1268 | ||
1269 | Between enable_break() and disable_break(), this code does not | |
1270 | properly handle hitting breakpoints which the user might have | |
1271 | set in the startup code or in the dynamic linker itself. Proper | |
1272 | handling will probably have to wait until the implementation is | |
1273 | changed to use the "breakpoint handler function" method. | |
1274 | ||
1275 | Also, what if child has exit()ed? Must exit loop somehow. | |
1276 | */ | |
1277 | ||
1278 | void | |
1279 | solib_create_inferior_hook() | |
1280 | { | |
ff56144e JK |
1281 | /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base |
1282 | yet. In fact, in the case of a SunOS4 executable being run on | |
1283 | Solaris, we can't get it yet. find_solib will get it when it needs | |
1284 | it. */ | |
1285 | #if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) | |
f8b76e70 FF |
1286 | if ((debug_base = locate_base ()) == 0) |
1287 | { | |
1288 | /* Can't find the symbol or the executable is statically linked. */ | |
1289 | return; | |
1290 | } | |
ff56144e | 1291 | #endif |
f8b76e70 FF |
1292 | |
1293 | if (!enable_break ()) | |
1294 | { | |
1295 | warning ("shared library handler failed to enable breakpoint"); | |
1296 | return; | |
1297 | } | |
1298 | ||
1299 | /* Now run the target. It will eventually hit the breakpoint, at | |
1300 | which point all of the libraries will have been mapped in and we | |
1301 | can go groveling around in the dynamic linker structures to find | |
1302 | out what we need to know about them. */ | |
bdbd5f50 JG |
1303 | |
1304 | clear_proceed_status (); | |
1305 | stop_soon_quietly = 1; | |
4ad0021e | 1306 | stop_signal = TARGET_SIGNAL_0; |
f8b76e70 | 1307 | do |
bdbd5f50 | 1308 | { |
8d60affd | 1309 | target_resume (-1, 0, stop_signal); |
bdbd5f50 JG |
1310 | wait_for_inferior (); |
1311 | } | |
4ad0021e | 1312 | while (stop_signal != TARGET_SIGNAL_TRAP); |
bdbd5f50 | 1313 | stop_soon_quietly = 0; |
f8b76e70 FF |
1314 | |
1315 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1316 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1317 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1318 | add any shared libraries that were mapped in. */ | |
bdbd5f50 | 1319 | |
f8b76e70 FF |
1320 | if (DECR_PC_AFTER_BREAK) |
1321 | { | |
1322 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1323 | write_register (PC_REGNUM, stop_pc); | |
1324 | } | |
1325 | ||
1326 | if (!disable_break ()) | |
1327 | { | |
1328 | warning ("shared library handler failed to disable breakpoint"); | |
1329 | } | |
1330 | ||
1331 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
bdbd5f50 JG |
1332 | } |
1333 | ||
f8b76e70 FF |
1334 | /* |
1335 | ||
b0246b3b FF |
1336 | LOCAL FUNCTION |
1337 | ||
1338 | special_symbol_handling -- additional shared library symbol handling | |
1339 | ||
1340 | SYNOPSIS | |
1341 | ||
1342 | void special_symbol_handling (struct so_list *so) | |
1343 | ||
1344 | DESCRIPTION | |
1345 | ||
1346 | Once the symbols from a shared object have been loaded in the usual | |
1347 | way, we are called to do any system specific symbol handling that | |
1348 | is needed. | |
1349 | ||
1350 | For Suns, this consists of grunging around in the dynamic linkers | |
1351 | structures to find symbol definitions for "common" symbols and | |
1352 | adding them to the minimal symbol table for the corresponding | |
1353 | objfile. | |
1354 | ||
1355 | */ | |
1356 | ||
1357 | static void | |
1358 | special_symbol_handling (so) | |
1359 | struct so_list *so; | |
1360 | { | |
1361 | #ifndef SVR4_SHARED_LIBS | |
51b57ded FF |
1362 | int j; |
1363 | ||
1364 | if (debug_addr == 0) | |
1365 | { | |
1366 | /* Get link_dynamic structure */ | |
1367 | ||
1368 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1369 | sizeof (dynamic_copy)); | |
1370 | if (j) | |
1371 | { | |
1372 | /* unreadable */ | |
1373 | return; | |
1374 | } | |
1375 | ||
1376 | /* Calc address of debugger interface structure */ | |
1377 | /* FIXME, this needs work for cross-debugging of core files | |
1378 | (byteorder, size, alignment, etc). */ | |
1379 | ||
1380 | debug_addr = (CORE_ADDR) dynamic_copy.ldd; | |
1381 | } | |
b0246b3b FF |
1382 | |
1383 | /* Read the debugger structure from the inferior, just to make sure | |
1384 | we have a current copy. */ | |
1385 | ||
51b57ded FF |
1386 | j = target_read_memory (debug_addr, (char *) &debug_copy, |
1387 | sizeof (debug_copy)); | |
1388 | if (j) | |
1389 | return; /* unreadable */ | |
b0246b3b FF |
1390 | |
1391 | /* Get common symbol definitions for the loaded object. */ | |
1392 | ||
1393 | if (debug_copy.ldd_cp) | |
1394 | { | |
1395 | solib_add_common_symbols (debug_copy.ldd_cp, so -> objfile); | |
1396 | } | |
1397 | ||
1398 | #endif /* !SVR4_SHARED_LIBS */ | |
1399 | } | |
1400 | ||
1401 | ||
1402 | /* | |
1403 | ||
1404 | LOCAL FUNCTION | |
f8b76e70 FF |
1405 | |
1406 | sharedlibrary_command -- handle command to explicitly add library | |
1407 | ||
1408 | SYNOPSIS | |
1409 | ||
b0246b3b | 1410 | static void sharedlibrary_command (char *args, int from_tty) |
f8b76e70 FF |
1411 | |
1412 | DESCRIPTION | |
1413 | ||
1414 | */ | |
1415 | ||
b0246b3b | 1416 | static void |
bdbd5f50 | 1417 | sharedlibrary_command (args, from_tty) |
f8b76e70 FF |
1418 | char *args; |
1419 | int from_tty; | |
bdbd5f50 | 1420 | { |
f8b76e70 FF |
1421 | dont_repeat (); |
1422 | solib_add (args, from_tty, (struct target_ops *) 0); | |
bd5635a1 RP |
1423 | } |
1424 | ||
1425 | void | |
1426 | _initialize_solib() | |
1427 | { | |
f8b76e70 FF |
1428 | |
1429 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
bd5635a1 | 1430 | "Load shared object library symbols for files matching REGEXP."); |
f8b76e70 FF |
1431 | add_info ("sharedlibrary", info_sharedlibrary_command, |
1432 | "Status of loaded shared object libraries."); | |
bd5635a1 | 1433 | } |