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53a5351d JM |
1 | /* Handle HP ELF shared libraries for GDB, the GNU Debugger. |
2 | Copyright 1999 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
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 | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. | |
20 | ||
21 | HP in their infinite stupidity choose not to use standard ELF dynamic | |
22 | linker interfaces. They also choose not to make their ELF dymamic | |
23 | linker interfaces compatible with the SOM dynamic linker. The | |
24 | net result is we can not use either of the existing somsolib.c or | |
25 | solib.c. What a crock. | |
26 | ||
27 | Even more disgusting. This file depends on functions provided only | |
28 | in certain PA64 libraries. Thus this file is supposed to only be | |
29 | used native. When will HP ever learn that they need to provide the | |
30 | same functionality in all their libraries! */ | |
31 | ||
32 | #include <dlfcn.h> | |
33 | #include <elf.h> | |
34 | #include <elf_hp.h> | |
35 | ||
36 | #include "defs.h" | |
37 | ||
38 | #include "frame.h" | |
39 | #include "bfd.h" | |
40 | #include "libhppa.h" | |
41 | #include "gdbcore.h" | |
42 | #include "symtab.h" | |
43 | #include "breakpoint.h" | |
44 | #include "symfile.h" | |
45 | #include "objfiles.h" | |
46 | #include "inferior.h" | |
47 | #include "gdb-stabs.h" | |
48 | #include "gdb_stat.h" | |
49 | #include "gdbcmd.h" | |
50 | #include "assert.h" | |
51 | #include "language.h" | |
52 | ||
53 | #include <fcntl.h> | |
54 | ||
55 | #ifndef O_BINARY | |
56 | #define O_BINARY 0 | |
57 | #endif | |
58 | ||
59 | /* Defined in exec.c; used to prevent dangling pointer bug. */ | |
60 | extern struct target_ops exec_ops; | |
61 | ||
62 | static CORE_ADDR | |
63 | bfd_lookup_symbol PARAMS ((bfd *, char *)); | |
64 | /* This lives in hppa-tdep.c. */ | |
65 | extern struct unwind_table_entry *find_unwind_entry PARAMS ((CORE_ADDR pc)); | |
66 | ||
67 | /* These ought to be defined in some public interface, but aren't. They | |
68 | identify dynamic linker events. */ | |
69 | #define DLD_CB_LOAD 1 | |
70 | #define DLD_CB_UNLOAD 0 | |
71 | ||
72 | /* A structure to keep track of all the known shared objects. */ | |
73 | struct so_list | |
74 | { | |
75 | bfd *abfd; | |
76 | char *name; | |
77 | struct so_list *next; | |
78 | struct objfile *objfile; | |
79 | CORE_ADDR pa64_solib_desc_addr; | |
80 | struct load_module_desc pa64_solib_desc; | |
81 | struct section_table *sections; | |
82 | struct section_table *sections_end; | |
83 | boolean loaded; | |
84 | }; | |
85 | ||
86 | static struct so_list *so_list_head; | |
87 | ||
88 | /* This is the cumulative size in bytes of the symbol tables of all | |
89 | shared objects on the so_list_head list. (When we say size, here | |
90 | we mean of the information before it is brought into memory and | |
91 | potentially expanded by GDB.) When adding a new shlib, this value | |
92 | is compared against the threshold size, held by auto_solib_add | |
93 | (in megabytes). If adding symbols for the new shlib would cause | |
94 | the total size to exceed the threshold, then the new shlib's symbols | |
95 | are not loaded. */ | |
96 | static LONGEST pa64_solib_total_st_size; | |
97 | ||
98 | /* When the threshold is reached for any shlib, we refuse to add | |
99 | symbols for subsequent shlibs, even if those shlibs' symbols would | |
100 | be small enough to fit under the threshold. (Although this may | |
101 | result in one, early large shlib preventing the loading of later, | |
102 | smalller shlibs' symbols, it allows us to issue one informational | |
103 | message. The alternative, to issue a message for each shlib whose | |
104 | symbols aren't loaded, could be a big annoyance where the threshold | |
105 | is exceeded due to a very large number of shlibs.) */ | |
106 | static int pa64_solib_st_size_threshold_exceeded; | |
107 | ||
108 | /* When adding fields, be sure to clear them in _initialize_pa64_solib. */ | |
109 | typedef struct | |
110 | { | |
111 | CORE_ADDR dld_flags_addr; | |
112 | long long dld_flags; | |
113 | sec_ptr dyninfo_sect; | |
114 | boolean have_read_dld_descriptor; | |
115 | boolean is_valid; | |
116 | CORE_ADDR load_map; | |
117 | CORE_ADDR load_map_addr; | |
118 | struct load_module_desc dld_desc; | |
119 | } | |
120 | dld_cache_t; | |
121 | ||
122 | static dld_cache_t dld_cache; | |
123 | ||
124 | static void pa64_sharedlibrary_info_command PARAMS ((char *, int)); | |
125 | ||
126 | static void pa64_solib_sharedlibrary_command PARAMS ((char *, int)); | |
127 | ||
128 | static void * pa64_target_read_memory PARAMS ((void *, CORE_ADDR, size_t, int)); | |
129 | ||
130 | static boolean read_dld_descriptor PARAMS ((struct target_ops *)); | |
131 | ||
132 | static boolean read_dynamic_info PARAMS ((asection *, dld_cache_t *)); | |
133 | ||
134 | static void add_to_solist PARAMS ((boolean, char *, struct load_module_desc *, | |
135 | CORE_ADDR, struct target_ops *)); | |
136 | ||
137 | /* When examining the shared library for debugging information we have to | |
138 | look for HP debug symbols, stabs and dwarf2 debug symbols. */ | |
139 | static char *pa64_debug_section_names[] = { | |
140 | ".debug_header", ".debug_gntt", ".debug_lntt", ".debug_slt", ".debug_vt", | |
141 | ".stabs", ".stabstr", ".debug_info", ".debug_abbrev", ".debug_aranges", | |
142 | ".debug_macinfo", ".debug_line", ".debug_loc", ".debug_pubnames", | |
143 | ".debug_str", NULL | |
144 | }; | |
145 | ||
146 | /* Return a ballbark figure for the amount of memory GDB will need to | |
147 | allocate to read in the debug symbols from FILENAME. */ | |
148 | static LONGEST | |
149 | pa64_solib_sizeof_symbol_table (filename) | |
150 | char *filename; | |
151 | { | |
152 | bfd *abfd; | |
153 | int i; | |
154 | int desc; | |
155 | char *absolute_name; | |
156 | LONGEST st_size = (LONGEST) 0; | |
157 | asection *sect; | |
158 | ||
159 | /* We believe that filename was handed to us by the dynamic linker, and | |
160 | is therefore always an absolute path. */ | |
161 | desc = openp (getenv ("PATH"), 1, filename, O_RDONLY | O_BINARY, | |
162 | 0, &absolute_name); | |
163 | if (desc < 0) | |
164 | { | |
165 | perror_with_name (filename); | |
166 | } | |
167 | filename = absolute_name; | |
168 | ||
169 | abfd = bfd_fdopenr (filename, gnutarget, desc); | |
170 | if (!abfd) | |
171 | { | |
172 | close (desc); | |
173 | make_cleanup (free, filename); | |
174 | error ("\"%s\": can't open to read symbols: %s.", filename, | |
175 | bfd_errmsg (bfd_get_error ())); | |
176 | } | |
177 | ||
178 | if (!bfd_check_format (abfd, bfd_object)) | |
179 | { | |
180 | bfd_close (abfd); | |
181 | make_cleanup (free, filename); | |
182 | error ("\"%s\": can't read symbols: %s.", filename, | |
183 | bfd_errmsg (bfd_get_error ())); | |
184 | } | |
185 | ||
186 | /* Sum the sizes of the various sections that compose debug info. */ | |
187 | for (i = 0; pa64_debug_section_names[i] != NULL; i++) | |
188 | { | |
189 | asection *sect; | |
190 | ||
191 | sect = bfd_get_section_by_name (abfd, pa64_debug_section_names[i]); | |
192 | if (sect) | |
193 | st_size += (LONGEST)bfd_section_size (abfd, sect); | |
194 | } | |
195 | ||
196 | bfd_close (abfd); | |
197 | free (filename); | |
198 | ||
199 | /* Unfortunately, just summing the sizes of various debug info | |
200 | sections isn't a very accurate measurement of how much heap | |
201 | space the debugger will need to hold them. It also doesn't | |
202 | account for space needed by linker (aka "minimal") symbols. | |
203 | ||
204 | Anecdotal evidence suggests that just summing the sizes of | |
205 | debug-info-related sections understates the heap space needed | |
206 | to represent it internally by about an order of magnitude. | |
207 | ||
208 | Since it's not exactly brain surgery we're doing here, rather | |
209 | than attempt to more accurately measure the size of a shlib's | |
210 | symbol table in GDB's heap, we'll just apply a 10x fudge- | |
211 | factor to the debug info sections' size-sum. No, this doesn't | |
212 | account for minimal symbols in non-debuggable shlibs. But it | |
213 | all roughly washes out in the end. */ | |
214 | return st_size * (LONGEST) 10; | |
215 | } | |
216 | ||
217 | /* Add a shared library to the objfile list and load its symbols into | |
218 | GDB's symbol table. */ | |
219 | static void | |
220 | pa64_solib_add_solib_objfile (so, name, from_tty, text_addr) | |
221 | struct so_list *so; | |
222 | char *name; | |
223 | int from_tty; | |
224 | CORE_ADDR text_addr; | |
225 | { | |
226 | bfd *tmp_bfd; | |
227 | asection *sec; | |
228 | obj_private_data_t *obj_private; | |
229 | ||
230 | /* We need the BFD so that we can look at its sections. We open up the | |
231 | file temporarily, then close it when we are done. */ | |
232 | tmp_bfd = bfd_openr (name, gnutarget); | |
233 | if (tmp_bfd == NULL) | |
234 | { | |
235 | perror_with_name (name); | |
236 | return; | |
237 | } | |
238 | ||
239 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
240 | { | |
241 | bfd_close (tmp_bfd); | |
242 | error ("\"%s\" is not an object file: %s", name, | |
243 | bfd_errmsg (bfd_get_error ())); | |
244 | } | |
245 | ||
246 | ||
247 | /* Undo some braindamage from symfile.c. | |
248 | ||
249 | First, symfile.c will subtract the VMA of the first .text section | |
250 | in the shared library that it finds. Undo that. */ | |
251 | sec = bfd_get_section_by_name (tmp_bfd, ".text"); | |
252 | text_addr += bfd_section_vma (tmp_bfd, sec); | |
253 | ||
254 | /* Now find the true lowest section in the shared library. */ | |
255 | sec = NULL; | |
256 | bfd_map_over_sections (tmp_bfd, find_lowest_section, (PTR) &sec); | |
257 | ||
258 | if (sec) | |
259 | { | |
260 | /* Subtract out the VMA of the lowest section. */ | |
261 | text_addr -= bfd_section_vma (tmp_bfd, sec); | |
262 | ||
263 | /* ??? Add back in the filepos of that lowest section. */ | |
264 | text_addr += sec->filepos; | |
265 | } | |
266 | ||
267 | /* We are done with the temporary bfd. Get rid of it and make sure | |
268 | nobody else can us it. */ | |
269 | bfd_close (tmp_bfd); | |
270 | tmp_bfd = NULL; | |
271 | ||
272 | /* Now let the generic code load up symbols for this library. */ | |
273 | so->objfile = symbol_file_add (name, from_tty, text_addr, 0, 0, 0, 0, 1); | |
274 | so->abfd = so->objfile->obfd; | |
275 | ||
276 | /* Mark this as a shared library and save private data. */ | |
277 | so->objfile->flags |= OBJF_SHARED; | |
278 | ||
279 | if (so->objfile->obj_private == NULL) | |
280 | { | |
281 | obj_private = (obj_private_data_t *) | |
282 | obstack_alloc (&so->objfile->psymbol_obstack, | |
283 | sizeof (obj_private_data_t)); | |
284 | obj_private->unwind_info = NULL; | |
285 | obj_private->so_info = NULL; | |
286 | so->objfile->obj_private = (PTR) obj_private; | |
287 | } | |
288 | ||
289 | obj_private = (obj_private_data_t *) so->objfile->obj_private; | |
290 | obj_private->so_info = so; | |
291 | obj_private->dp = so->pa64_solib_desc.linkage_ptr; | |
292 | } | |
293 | ||
294 | /* Load debugging information for a shared library. TARGET may be | |
295 | NULL if we are not attaching to a process or reading a core file. */ | |
296 | ||
297 | static void | |
298 | pa64_solib_load_symbols (so, name, from_tty, text_addr, target) | |
299 | struct so_list *so; | |
300 | char *name; | |
301 | int from_tty; | |
302 | CORE_ADDR text_addr; | |
303 | struct target_ops *target; | |
304 | { | |
305 | struct section_table *p; | |
306 | asection *sec; | |
307 | int status; | |
308 | char buf[4]; | |
309 | CORE_ADDR presumed_data_start; | |
310 | ||
311 | if (text_addr == 0) | |
312 | text_addr = so->pa64_solib_desc.text_base; | |
313 | ||
314 | pa64_solib_add_solib_objfile (so, name, from_tty, text_addr); | |
315 | ||
316 | /* Now we need to build a section table for this library since | |
317 | we might be debugging a core file from a dynamically linked | |
318 | executable in which the libraries were not privately mapped. */ | |
319 | if (build_section_table (so->abfd, | |
320 | &so->sections, | |
321 | &so->sections_end)) | |
322 | { | |
323 | error ("Unable to build section table for shared library\n."); | |
324 | return; | |
325 | } | |
326 | ||
327 | ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT) | |
328 | = so->pa64_solib_desc.text_base; | |
329 | ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA) | |
330 | = so->pa64_solib_desc.data_base; | |
331 | ||
332 | /* Relocate all the sections based on where they got loaded. */ | |
333 | for (p = so->sections; p < so->sections_end; p++) | |
334 | { | |
335 | if (p->the_bfd_section->flags & SEC_CODE) | |
336 | { | |
337 | p->addr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT); | |
338 | p->endaddr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT); | |
339 | } | |
340 | else if (p->the_bfd_section->flags & SEC_DATA) | |
341 | { | |
342 | p->addr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA); | |
343 | p->endaddr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA); | |
344 | } | |
345 | } | |
346 | ||
347 | /* Now see if we need to map in the text and data for this shared | |
348 | library (for example debugging a core file which does not use | |
349 | private shared libraries.). | |
350 | ||
351 | Carefully peek at the first text address in the library. If the | |
352 | read succeeds, then the libraries were privately mapped and were | |
353 | included in the core dump file. | |
354 | ||
355 | If the peek failed, then the libraries were not privately mapped | |
356 | and are not in the core file, we'll have to read them in ourselves. */ | |
357 | status = target_read_memory (text_addr, buf, 4); | |
358 | if (status != 0) | |
359 | { | |
360 | int old, new; | |
361 | int update_coreops; | |
362 | int update_execops; | |
363 | ||
364 | /* We must update the to_sections field in the core_ops structure | |
365 | here, otherwise we dereference a potential dangling pointer | |
366 | for each call to target_read/write_memory within this routine. */ | |
367 | update_coreops = core_ops.to_sections == target->to_sections; | |
368 | ||
369 | /* Ditto exec_ops (this was a bug). */ | |
370 | update_execops = exec_ops.to_sections == target->to_sections; | |
371 | ||
372 | new = so->sections_end - so->sections; | |
373 | /* Add sections from the shared library to the core target. */ | |
374 | if (target->to_sections) | |
375 | { | |
376 | old = target->to_sections_end - target->to_sections; | |
377 | target->to_sections = (struct section_table *) | |
378 | xrealloc ((char *) target->to_sections, | |
379 | ((sizeof (struct section_table)) * (old + new))); | |
380 | } | |
381 | else | |
382 | { | |
383 | old = 0; | |
384 | target->to_sections = (struct section_table *) | |
385 | xmalloc ((sizeof (struct section_table)) * new); | |
386 | } | |
387 | target->to_sections_end = (target->to_sections + old + new); | |
388 | ||
389 | /* Update the to_sections field in the core_ops structure | |
390 | if needed, ditto exec_ops. */ | |
391 | if (update_coreops) | |
392 | { | |
393 | core_ops.to_sections = target->to_sections; | |
394 | core_ops.to_sections_end = target->to_sections_end; | |
395 | } | |
396 | ||
397 | if (update_execops) | |
398 | { | |
399 | exec_ops.to_sections = target->to_sections; | |
400 | exec_ops.to_sections_end = target->to_sections_end; | |
401 | } | |
402 | ||
403 | /* Copy over the old data before it gets clobbered. */ | |
404 | memcpy ((char *) (target->to_sections + old), | |
405 | so->sections, | |
406 | ((sizeof (struct section_table)) * new)); | |
407 | } | |
408 | } | |
409 | ||
410 | ||
411 | /* Add symbols from shared libraries into the symtab list, unless the | |
412 | size threshold (specified by auto_solib_add, in megabytes) would | |
413 | be exceeded. */ | |
414 | ||
415 | void | |
416 | pa64_solib_add (arg_string, from_tty, target) | |
417 | char *arg_string; | |
418 | int from_tty; | |
419 | struct target_ops *target; | |
420 | { | |
421 | struct minimal_symbol *msymbol; | |
422 | CORE_ADDR addr; | |
423 | asection *shlib_info; | |
424 | int status; | |
425 | unsigned int dld_flags; | |
426 | char buf[4], *re_err; | |
427 | int threshold_warning_given = 0; | |
428 | int dll_index; | |
429 | struct load_module_desc dll_desc; | |
430 | char *dll_path; | |
431 | ||
432 | /* First validate our arguments. */ | |
433 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) | |
434 | { | |
435 | error ("Invalid regexp: %s", re_err); | |
436 | } | |
437 | ||
438 | /* If we're debugging a core file, or have attached to a running | |
439 | process, then pa64_solib_create_inferior_hook will not have been | |
440 | called. | |
441 | ||
442 | We need to first determine if we're dealing with a dynamically | |
443 | linked executable. If not, then return without an error or warning. | |
444 | ||
445 | We also need to examine __dld_flags to determine if the shared library | |
446 | list is valid and to determine if the libraries have been privately | |
447 | mapped. */ | |
448 | if (symfile_objfile == NULL) | |
449 | return; | |
450 | ||
451 | /* First see if the objfile was dynamically linked. */ | |
452 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, ".dynamic"); | |
453 | if (!shlib_info) | |
454 | return; | |
455 | ||
456 | /* It's got a .dynamic section, make sure it's not empty. */ | |
457 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) | |
458 | return; | |
459 | ||
460 | /* Read in the load map pointer if we have not done so already. */ | |
461 | if (! dld_cache.have_read_dld_descriptor) | |
462 | if (! read_dld_descriptor (target)) | |
463 | return; | |
464 | ||
465 | /* If the libraries were not mapped private, warn the user. */ | |
466 | if ((dld_cache.dld_flags & DT_HP_DEBUG_PRIVATE) == 0) | |
467 | warning ("The shared libraries were not privately mapped; setting a\nbreakpoint in a shared library will not work until you rerun the program.\n"); | |
468 | ||
469 | /* For each shaerd library, add it to the shared library list. */ | |
470 | for (dll_index = 1; ; dll_index++) | |
471 | { | |
472 | /* Read in the load module descriptor. */ | |
473 | if (dlgetmodinfo (dll_index, &dll_desc, sizeof (dll_desc), | |
474 | pa64_target_read_memory, 0, dld_cache.load_map) | |
475 | == 0) | |
476 | return; | |
477 | ||
478 | /* Get the name of the shared library. */ | |
479 | dll_path = (char *)dlgetname (&dll_desc, sizeof (dll_desc), | |
480 | pa64_target_read_memory, | |
481 | 0, dld_cache.load_map); | |
482 | ||
483 | if (!dll_path) | |
484 | error ("pa64_solib_add, unable to read shared library path."); | |
485 | ||
486 | add_to_solist (from_tty, dll_path, &dll_desc, 0, target); | |
487 | } | |
488 | } | |
489 | ||
490 | ||
491 | /* This hook gets called just before the first instruction in the | |
492 | inferior process is executed. | |
493 | ||
494 | This is our opportunity to set magic flags in the inferior so | |
495 | that GDB can be notified when a shared library is mapped in and | |
496 | to tell the dynamic linker that a private copy of the library is | |
497 | needed (so GDB can set breakpoints in the library). | |
498 | ||
499 | We need to set two flag bits in this routine. | |
500 | ||
501 | DT_HP_DEBUG_PRIVATE to indicate that shared libraries should be | |
502 | mapped private. | |
503 | ||
504 | DT_HP_DEBUG_CALLBACK to indicate that we want the dynamic linker to | |
505 | call the breakpoint routine for significant events. */ | |
506 | ||
507 | void | |
508 | pa64_solib_create_inferior_hook () | |
509 | { | |
510 | struct minimal_symbol *msymbol; | |
511 | unsigned int dld_flags, status; | |
512 | asection *shlib_info, *interp_sect; | |
513 | char buf[4]; | |
514 | struct objfile *objfile; | |
515 | CORE_ADDR anaddr; | |
516 | ||
517 | /* First, remove all the solib event breakpoints. Their addresses | |
518 | may have changed since the last time we ran the program. */ | |
519 | remove_solib_event_breakpoints (); | |
520 | ||
521 | if (symfile_objfile == NULL) | |
522 | return; | |
523 | ||
524 | /* First see if the objfile was dynamically linked. */ | |
525 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, ".dynamic"); | |
526 | if (!shlib_info) | |
527 | return; | |
528 | ||
529 | /* It's got a .dynamic section, make sure it's not empty. */ | |
530 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) | |
531 | return; | |
532 | ||
533 | /* Slam the pid of the process into __d_pid; failing is only a warning! */ | |
534 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); | |
535 | if (msymbol == NULL) | |
536 | { | |
537 | warning ("Unable to find __d_pid symbol in object file."); | |
538 | warning ("Suggest linking with /opt/langtools/lib/end.o."); | |
539 | warning ("GDB will be unable to track explicit library load/unload calls"); | |
540 | goto keep_going; | |
541 | } | |
542 | ||
543 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
544 | store_unsigned_integer (buf, 4, inferior_pid); | |
545 | status = target_write_memory (anaddr, buf, 4); | |
546 | if (status != 0) | |
547 | { | |
548 | warning ("Unable to write __d_pid"); | |
549 | warning ("Suggest linking with /opt/langtools/lib/end.o."); | |
550 | warning ("GDB will be unable to track explicit library load/unload calls"); | |
551 | goto keep_going; | |
552 | } | |
553 | ||
554 | keep_going: | |
555 | ||
556 | /* Read in the .dynamic section. */ | |
557 | if (! read_dynamic_info (shlib_info, &dld_cache)) | |
558 | error ("Unable to read the .dynamic section."); | |
559 | ||
560 | /* Turn on the flags we care about. */ | |
561 | dld_cache.dld_flags |= DT_HP_DEBUG_PRIVATE; | |
562 | /* ?!? Right now GDB is not recognizing hitting the callback breakpoint | |
563 | as a shared library event. Fix that and remove the #if0 code. */ | |
564 | #if 0 | |
565 | dld_cache.dld_flags |= DT_HP_DEBUG_CALLBACK; | |
566 | #endif | |
567 | status = target_write_memory (dld_cache.dld_flags_addr, | |
568 | (char *) &dld_cache.dld_flags, | |
569 | sizeof (dld_cache.dld_flags)); | |
570 | if (status != 0) | |
571 | error ("Unable to modify dynamic linker flags."); | |
572 | ||
573 | /* Now we have to create a shared library breakpoint in the dynamic | |
574 | linker. This can be somewhat tricky since the symbol is inside | |
575 | the dynamic linker (for which we do not have symbols or a base | |
576 | load address! Luckily I wrote this code for solib.c years ago. */ | |
577 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
578 | if (interp_sect) | |
579 | { | |
580 | unsigned int interp_sect_size; | |
581 | char *buf; | |
582 | CORE_ADDR load_addr; | |
583 | bfd *tmp_bfd; | |
584 | CORE_ADDR sym_addr = 0; | |
585 | ||
586 | /* Read the contents of the .interp section into a local buffer; | |
587 | the contents specify the dynamic linker this program uses. */ | |
588 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); | |
589 | buf = alloca (interp_sect_size); | |
590 | bfd_get_section_contents (exec_bfd, interp_sect, | |
591 | buf, 0, interp_sect_size); | |
592 | ||
593 | /* Now we need to figure out where the dynamic linker was | |
594 | loaded so that we can load its symbols and place a breakpoint | |
595 | in the dynamic linker itself. | |
596 | ||
597 | This address is stored on the stack. However, I've been unable | |
598 | to find any magic formula to find it for Solaris (appears to | |
599 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
600 | mechanism to find the dynamic linker's base address. */ | |
601 | tmp_bfd = bfd_openr (buf, gnutarget); | |
602 | if (tmp_bfd == NULL) | |
603 | goto get_out; | |
604 | ||
605 | /* Make sure the dynamic linker's really a useful object. */ | |
606 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
607 | { | |
608 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |
609 | bfd_close (tmp_bfd); | |
610 | goto get_out; | |
611 | } | |
612 | ||
613 | /* We find the dynamic linker's base address by examining the | |
614 | current pc (which point at the entry point for the dynamic | |
615 | linker) and subtracting the offset of the entry point. | |
616 | ||
617 | Also note the breakpoint is the second instruction in the | |
618 | routine. */ | |
619 | load_addr = read_pc () - tmp_bfd->start_address; | |
620 | sym_addr = bfd_lookup_symbol (tmp_bfd, "__dld_break"); | |
621 | sym_addr = load_addr + sym_addr + 4; | |
622 | ||
623 | /* Create the shared library breakpoint. */ | |
624 | create_solib_event_breakpoint (sym_addr); | |
625 | ||
626 | /* We're done with the temporary bfd. */ | |
627 | bfd_close (tmp_bfd); | |
628 | } | |
629 | ||
630 | get_out: | |
631 | /* Wipe out all knowledge of old shared libraries since their | |
632 | mapping can change from one exec to another! */ | |
633 | while (so_list_head) | |
634 | { | |
635 | struct so_list *temp; | |
636 | ||
637 | temp = so_list_head; | |
638 | free (so_list_head); | |
639 | so_list_head = temp->next; | |
640 | } | |
641 | clear_symtab_users (); | |
642 | } | |
643 | ||
644 | /* This operation removes the "hook" between GDB and the dynamic linker, | |
645 | which causes the dld to notify GDB of shared library events. | |
646 | ||
647 | After this operation completes, the dld will no longer notify GDB of | |
648 | shared library events. To resume notifications, GDB must call | |
649 | pa64_solib_create_inferior_hook. | |
650 | ||
651 | This operation does not remove any knowledge of shared libraries which | |
652 | GDB may already have been notified of. */ | |
653 | ||
654 | void | |
655 | pa64_solib_remove_inferior_hook (pid) | |
656 | int pid; | |
657 | { | |
658 | /* Turn off the DT_HP_DEBUG_CALLBACK bit in the dynamic linker flags. */ | |
659 | dld_cache.dld_flags &= ~DT_HP_DEBUG_CALLBACK; | |
660 | target_write_memory (dld_cache.dld_flags_addr, | |
661 | (char *)&dld_cache.dld_flags, | |
662 | sizeof (dld_cache.dld_flags)); | |
663 | } | |
664 | ||
665 | /* This function creates a breakpoint on the dynamic linker hook, which | |
666 | is called when e.g., a shl_load or shl_unload call is made. This | |
667 | breakpoint will only trigger when a shl_load call is made. | |
668 | ||
669 | If filename is NULL, then loads of any dll will be caught. Else, | |
670 | only loads of the file whose pathname is the string contained by | |
671 | filename will be caught. | |
672 | ||
673 | Undefined behaviour is guaranteed if this function is called before | |
674 | pa64_solib_create_inferior_hook. */ | |
675 | ||
676 | void | |
677 | pa64_solib_create_catch_load_hook (pid, tempflag, filename, cond_string) | |
678 | int pid; | |
679 | int tempflag; | |
680 | char *filename; | |
681 | char *cond_string; | |
682 | { | |
683 | create_solib_load_event_breakpoint ("", tempflag, filename, cond_string); | |
684 | } | |
685 | ||
686 | /* This function creates a breakpoint on the dynamic linker hook, which | |
687 | is called when e.g., a shl_load or shl_unload call is made. This | |
688 | breakpoint will only trigger when a shl_unload call is made. | |
689 | ||
690 | If filename is NULL, then unloads of any dll will be caught. Else, | |
691 | only unloads of the file whose pathname is the string contained by | |
692 | filename will be caught. | |
693 | ||
694 | Undefined behaviour is guaranteed if this function is called before | |
695 | pa64_solib_create_inferior_hook. */ | |
696 | ||
697 | void | |
698 | pa64_solib_create_catch_unload_hook (pid, tempflag, filename, cond_string) | |
699 | int pid; | |
700 | int tempflag; | |
701 | char *filename; | |
702 | char *cond_string; | |
703 | { | |
704 | create_solib_unload_event_breakpoint ("", tempflag, filename, cond_string); | |
705 | } | |
706 | ||
707 | /* Return nonzero if the dynamic linker has reproted that a library | |
708 | has been loaded. */ | |
709 | ||
710 | int | |
711 | pa64_solib_have_load_event (pid) | |
712 | int pid; | |
713 | { | |
714 | CORE_ADDR event_kind; | |
715 | ||
716 | event_kind = read_register (ARG0_REGNUM); | |
717 | return (event_kind == DLD_CB_LOAD); | |
718 | } | |
719 | ||
720 | /* Return nonzero if the dynamic linker has reproted that a library | |
721 | has been unloaded. */ | |
722 | int | |
723 | pa64_solib_have_unload_event (pid) | |
724 | int pid; | |
725 | { | |
726 | CORE_ADDR event_kind; | |
727 | ||
728 | event_kind = read_register (ARG0_REGNUM); | |
729 | return (event_kind == DLD_CB_UNLOAD); | |
730 | } | |
731 | ||
732 | /* Return a pointer to a string indicating the pathname of the most | |
733 | recently loaded library. | |
734 | ||
735 | The caller is reposible for copying the string before the inferior is | |
736 | restarted. */ | |
737 | ||
738 | char * | |
739 | pa64_solib_loaded_library_pathname (pid) | |
740 | int pid; | |
741 | { | |
742 | static char dll_path[MAXPATHLEN]; | |
743 | CORE_ADDR dll_path_addr = read_register (ARG3_REGNUM); | |
744 | read_memory_string (dll_path_addr, dll_path, MAXPATHLEN); | |
745 | return dll_path; | |
746 | } | |
747 | ||
748 | /* Return a pointer to a string indicating the pathname of the most | |
749 | recently unloaded library. | |
750 | ||
751 | The caller is reposible for copying the string before the inferior is | |
752 | restarted. */ | |
753 | ||
754 | char * | |
755 | pa64_solib_unloaded_library_pathname (pid) | |
756 | int pid; | |
757 | { | |
758 | static char dll_path[MAXPATHLEN]; | |
759 | CORE_ADDR dll_path_addr = read_register (ARG3_REGNUM); | |
760 | read_memory_string (dll_path_addr, dll_path, MAXPATHLEN); | |
761 | return dll_path; | |
762 | } | |
763 | ||
764 | /* Return nonzero if PC is an address inside the dynamic linker. */ | |
765 | ||
766 | int | |
767 | pa64_solib_in_dynamic_linker (pid, pc) | |
768 | int pid; | |
769 | CORE_ADDR pc; | |
770 | { | |
771 | asection *shlib_info; | |
772 | ||
773 | if (symfile_objfile == NULL) | |
774 | return 0; | |
775 | ||
776 | if (!dld_cache.have_read_dld_descriptor) | |
777 | if (!read_dld_descriptor (¤t_target)) | |
778 | return 0; | |
779 | ||
780 | return (pc >= dld_cache.dld_desc.text_base | |
781 | && pc < dld_cache.dld_desc.text_base + dld_cache.dld_desc.text_size); | |
782 | } | |
783 | ||
784 | ||
785 | /* Return the GOT value for the shared library in which ADDR belongs. If | |
786 | ADDR isn't in any known shared library, return zero. */ | |
787 | ||
788 | CORE_ADDR | |
789 | pa64_solib_get_got_by_pc (addr) | |
790 | CORE_ADDR addr; | |
791 | { | |
792 | struct so_list *so_list = so_list_head; | |
793 | CORE_ADDR got_value = 0; | |
794 | ||
795 | while (so_list) | |
796 | { | |
797 | if (so_list->pa64_solib_desc.text_base <= addr | |
798 | && ((so_list->pa64_solib_desc.text_base | |
799 | + so_list->pa64_solib_desc.text_size) | |
800 | > addr)) | |
801 | { | |
802 | got_value = so_list->pa64_solib_desc.linkage_ptr; | |
803 | break; | |
804 | } | |
805 | so_list = so_list->next; | |
806 | } | |
807 | return got_value; | |
808 | } | |
809 | ||
810 | /* Return the address of the handle of the shared library in which ADDR | |
811 | belongs. If ADDR isn't in any known shared library, return zero. | |
812 | ||
813 | This function is used in hppa_fix_call_dummy in hppa-tdep.c. */ | |
814 | ||
815 | CORE_ADDR | |
816 | pa64_solib_get_solib_by_pc (addr) | |
817 | CORE_ADDR addr; | |
818 | { | |
819 | struct so_list *so_list = so_list_head; | |
820 | CORE_ADDR retval = 0; | |
821 | ||
822 | while (so_list) | |
823 | { | |
824 | if (so_list->pa64_solib_desc.text_base <= addr | |
825 | && ((so_list->pa64_solib_desc.text_base | |
826 | + so_list->pa64_solib_desc.text_size) | |
827 | > addr)) | |
828 | { | |
829 | retval = so_list->pa64_solib_desc_addr; | |
830 | break; | |
831 | } | |
832 | so_list = so_list->next; | |
833 | } | |
834 | return retval; | |
835 | } | |
836 | ||
837 | /* Dump information about all the currently loaded shared libraries. */ | |
838 | ||
839 | static void | |
840 | pa64_sharedlibrary_info_command (ignore, from_tty) | |
841 | char *ignore; | |
842 | int from_tty; | |
843 | { | |
844 | struct so_list *so_list = so_list_head; | |
845 | ||
846 | if (exec_bfd == NULL) | |
847 | { | |
848 | printf_unfiltered ("no exec file.\n"); | |
849 | return; | |
850 | } | |
851 | ||
852 | if (so_list == NULL) | |
853 | { | |
854 | printf_unfiltered ("No shared libraries loaded at this time.\n"); | |
855 | return; | |
856 | } | |
857 | ||
858 | printf_unfiltered ("Shared Object Libraries\n"); | |
859 | printf_unfiltered (" %-19s%-19s%-19s%-19s\n", | |
860 | " tstart", " tend", | |
861 | " dstart", " dend"); | |
862 | while (so_list) | |
863 | { | |
864 | unsigned int flags; | |
865 | ||
866 | printf_unfiltered ("%s", so_list->name); | |
867 | if (so_list->objfile == NULL) | |
868 | printf_unfiltered (" (symbols not loaded)"); | |
869 | if (so_list->loaded == 0) | |
870 | printf_unfiltered (" (shared library unloaded)"); | |
871 | printf_unfiltered (" %-18s", | |
872 | local_hex_string_custom (so_list->pa64_solib_desc.linkage_ptr, | |
873 | "016l")); | |
874 | printf_unfiltered ("\n"); | |
875 | printf_unfiltered ("%-18s", | |
876 | local_hex_string_custom (so_list->pa64_solib_desc.text_base, | |
877 | "016l")); | |
878 | printf_unfiltered (" %-18s", | |
879 | local_hex_string_custom ((so_list->pa64_solib_desc.text_base, | |
880 | + so_list->pa64_solib_desc.text_size), | |
881 | "016l")); | |
882 | printf_unfiltered (" %-18s", | |
883 | local_hex_string_custom (so_list->pa64_solib_desc.data_base, | |
884 | "016l")); | |
885 | printf_unfiltered (" %-18s\n", | |
886 | local_hex_string_custom ((so_list->pa64_solib_desc.data_base, | |
887 | + so_list->pa64_solib_desc.data_size), | |
888 | "016l")); | |
889 | so_list = so_list->next; | |
890 | } | |
891 | } | |
892 | ||
893 | /* Load up one or more shared libraries as directed by the user. */ | |
894 | ||
895 | static void | |
896 | pa64_solib_sharedlibrary_command (args, from_tty) | |
897 | char *args; | |
898 | int from_tty; | |
899 | { | |
900 | dont_repeat (); | |
901 | pa64_solib_add (args, from_tty, (struct target_ops *) 0); | |
902 | } | |
903 | ||
904 | /* Return the name of the shared library containing ADDR or NULL if ADDR | |
905 | is not contained in any known shared library. */ | |
906 | ||
907 | char * | |
908 | pa64_solib_address (addr) | |
909 | CORE_ADDR addr; | |
910 | { | |
911 | struct so_list *so = so_list_head; | |
912 | ||
913 | while (so) | |
914 | { | |
915 | /* Is this address within this shlib's text range? If so, | |
916 | return the shlib's name. */ | |
917 | if (addr >= so->pa64_solib_desc.text_base | |
918 | && addr < (so->pa64_solib_desc.text_base | |
919 | | so->pa64_solib_desc.text_size)) | |
920 | return so->name; | |
921 | ||
922 | /* Nope, keep looking... */ | |
923 | so = so->next; | |
924 | } | |
925 | ||
926 | /* No, we couldn't prove that the address is within a shlib. */ | |
927 | return NULL; | |
928 | } | |
929 | ||
930 | /* We are killing the inferior and restarting the program. */ | |
931 | ||
932 | void | |
933 | pa64_solib_restart () | |
934 | { | |
935 | struct so_list *sl = so_list_head; | |
936 | ||
937 | /* Before the shlib info vanishes, use it to disable any breakpoints | |
938 | that may still be active in those shlibs. */ | |
939 | disable_breakpoints_in_shlibs (0); | |
940 | ||
941 | /* Discard all the shlib descriptors. */ | |
942 | while (sl) | |
943 | { | |
944 | struct so_list *next_sl = sl->next; | |
945 | free (sl); | |
946 | sl = next_sl; | |
947 | } | |
948 | so_list_head = NULL; | |
949 | ||
950 | pa64_solib_total_st_size = (LONGEST) 0; | |
951 | pa64_solib_st_size_threshold_exceeded = 0; | |
952 | ||
953 | dld_cache.is_valid = 0; | |
954 | dld_cache.have_read_dld_descriptor = 0; | |
955 | dld_cache.dld_flags_addr = 0; | |
956 | dld_cache.load_map = 0; | |
957 | dld_cache.load_map_addr = 0; | |
958 | dld_cache.dld_desc.data_base = 0; | |
959 | dld_cache.dld_flags = 0; | |
960 | dld_cache.dyninfo_sect = 0; | |
961 | } | |
962 | ||
963 | void | |
964 | _initialize_pa64_solib () | |
965 | { | |
966 | add_com ("sharedlibrary", class_files, pa64_solib_sharedlibrary_command, | |
967 | "Load shared object library symbols for files matching REGEXP."); | |
968 | add_info ("sharedlibrary", pa64_sharedlibrary_info_command, | |
969 | "Status of loaded shared object libraries."); | |
970 | add_show_from_set | |
971 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, | |
972 | (char *) &auto_solib_add, | |
973 | "Set autoloading size threshold (in megabytes) of shared library symbols.\n\ | |
974 | If nonzero, symbols from all shared object libraries will be loaded\n\ | |
975 | automatically when the inferior begins execution or when the dynamic linker\n\ | |
976 | informs gdb that a new library has been loaded, until the symbol table\n\ | |
977 | of the program and libraries exceeds this threshold.\n\ | |
978 | Otherwise, symbols must be loaded manually, using `sharedlibrary'.", | |
979 | &setlist), | |
980 | &showlist); | |
981 | ||
982 | /* ??rehrauer: On HP-UX, the kernel parameter MAXDSIZ limits how much | |
983 | data space a process can use. We ought to be reading MAXDSIZ and | |
984 | setting auto_solib_add to some large fraction of that value. If | |
985 | not that, we maybe ought to be setting it smaller than the default | |
986 | for MAXDSIZ (that being 64Mb, I believe). However, [1] this threshold | |
987 | is only crudely approximated rather than actually measured, and [2] | |
988 | 50 Mbytes is too small for debugging gdb itself. Thus, the arbitrary | |
989 | 100 figure. | |
990 | */ | |
991 | auto_solib_add = 100; /* Megabytes */ | |
992 | ||
993 | pa64_solib_restart (); | |
994 | } | |
995 | ||
996 | /* Get some HPUX-specific data from a shared lib. */ | |
997 | CORE_ADDR | |
998 | so_lib_thread_start_addr (so) | |
999 | struct so_list *so; | |
1000 | { | |
1001 | return so->pa64_solib_desc.tls_start_addr; | |
1002 | } | |
1003 | ||
1004 | /* Read the dynamic linker's internal shared library descriptor. | |
1005 | ||
1006 | This must happen after dld starts running, so we can't do it in | |
1007 | read_dynamic_info. Record the fact that we have loaded the | |
1008 | descriptor. If the library is archive bound, then return zero, else | |
1009 | return nonzero. */ | |
1010 | ||
1011 | static boolean | |
1012 | read_dld_descriptor (target) | |
1013 | struct target_ops *target; | |
1014 | { | |
1015 | char *dll_path; | |
1016 | asection *dyninfo_sect; | |
1017 | ||
1018 | /* If necessary call read_dynamic_info to extract the contents of the | |
1019 | .dynamic section from the shared library. */ | |
1020 | if (!dld_cache.is_valid) | |
1021 | { | |
1022 | if (symfile_objfile == NULL) | |
1023 | error ("No object file symbols."); | |
1024 | ||
1025 | dyninfo_sect = bfd_get_section_by_name (symfile_objfile->obfd, | |
1026 | ".dynamic"); | |
1027 | if (!dyninfo_sect) | |
1028 | { | |
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | if (!read_dynamic_info (dyninfo_sect, &dld_cache)) | |
1033 | error ("Unable to read in .dynamic section information."); | |
1034 | } | |
1035 | ||
1036 | /* Read the load map pointer. */ | |
1037 | if (target_read_memory (dld_cache.load_map_addr, | |
1038 | (char*) &dld_cache.load_map, | |
1039 | sizeof(dld_cache.load_map)) | |
1040 | != 0) | |
1041 | { | |
1042 | error ("Error while reading in load map pointer."); | |
1043 | } | |
1044 | ||
1045 | /* Read in the dld load module descriptor */ | |
1046 | if (dlgetmodinfo (-1, | |
1047 | &dld_cache.dld_desc, | |
1048 | sizeof(dld_cache.dld_desc), | |
1049 | pa64_target_read_memory, | |
1050 | 0, | |
1051 | dld_cache.load_map) | |
1052 | == 0) | |
1053 | { | |
1054 | error ("Error trying to get information about dynamic linker."); | |
1055 | } | |
1056 | ||
1057 | /* Indicate that we have loaded the dld descriptor. */ | |
1058 | dld_cache.have_read_dld_descriptor = 1; | |
1059 | ||
1060 | /* Add dld.sl to the list of known shared libraries so that we can | |
1061 | do unwind, etc. | |
1062 | ||
1063 | ?!? This may not be correct. Consider of dld.sl contains symbols | |
1064 | which are also referenced/defined by the user program or some user | |
1065 | shared library. We need to make absolutely sure that we do not | |
1066 | pollute the namespace from GDB's point of view. */ | |
1067 | dll_path = dlgetname (&dld_cache.dld_desc, | |
1068 | sizeof(dld_cache.dld_desc), | |
1069 | pa64_target_read_memory, | |
1070 | 0, | |
1071 | dld_cache.load_map); | |
1072 | add_to_solist(0, dll_path, &dld_cache.dld_desc, 0, target); | |
1073 | ||
1074 | return 1; | |
1075 | } | |
1076 | ||
1077 | /* Read the .dynamic section and extract the information of interest, | |
1078 | which is stored in dld_cache. The routine elf_locate_base in solib.c | |
1079 | was used as a model for this. */ | |
1080 | ||
1081 | static boolean | |
1082 | read_dynamic_info (dyninfo_sect, dld_cache_p) | |
1083 | asection *dyninfo_sect; | |
1084 | dld_cache_t *dld_cache_p; | |
1085 | { | |
1086 | char *buf; | |
1087 | char *bufend; | |
1088 | CORE_ADDR dyninfo_addr; | |
1089 | int dyninfo_sect_size; | |
1090 | CORE_ADDR entry_addr; | |
1091 | ||
1092 | /* Read in .dynamic section, silently ignore errors. */ | |
1093 | dyninfo_addr = bfd_section_vma (symfile_objfile->obfd, dyninfo_sect); | |
1094 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); | |
1095 | buf = alloca (dyninfo_sect_size); | |
1096 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
1097 | return 0; | |
1098 | ||
1099 | /* Scan the .dynamic section and record the items of interest. | |
1100 | In particular, DT_HP_DLD_FLAGS */ | |
1101 | for (bufend = buf + dyninfo_sect_size, entry_addr = dyninfo_addr; | |
1102 | buf < bufend; | |
1103 | buf += sizeof (Elf64_Dyn), entry_addr += sizeof (Elf64_Dyn)) | |
1104 | { | |
1105 | Elf64_Dyn *x_dynp = (Elf64_Dyn*)buf; | |
1106 | Elf64_Sxword dyn_tag; | |
1107 | CORE_ADDR dyn_ptr; | |
1108 | char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT]; | |
1109 | ||
1110 | dyn_tag = bfd_h_get_64 (symfile_objfile->obfd, | |
1111 | (bfd_byte*) &x_dynp->d_tag); | |
1112 | ||
1113 | /* We can't use a switch here because dyn_tag is 64 bits and HP's | |
1114 | lame comiler does not handle 64bit items in switch statements. */ | |
1115 | if (dyn_tag == DT_NULL) | |
1116 | break; | |
1117 | else if (dyn_tag == DT_HP_DLD_FLAGS) | |
1118 | { | |
1119 | /* Set dld_flags_addr and dld_flags in *dld_cache_p */ | |
1120 | dld_cache_p->dld_flags_addr = entry_addr + offsetof(Elf64_Dyn, d_un); | |
1121 | if (target_read_memory (dld_cache_p->dld_flags_addr, | |
1122 | (char*) &dld_cache_p->dld_flags, | |
1123 | sizeof(dld_cache_p->dld_flags)) | |
1124 | != 0) | |
1125 | { | |
1126 | error ("Error while reading in .dynamic section of the program."); | |
1127 | } | |
1128 | } | |
1129 | else if (dyn_tag == DT_HP_LOAD_MAP) | |
1130 | { | |
1131 | /* Dld will place the address of the load map at load_map_addr | |
1132 | after it starts running. */ | |
1133 | if (target_read_memory (entry_addr + offsetof(Elf64_Dyn, | |
1134 | d_un.d_ptr), | |
1135 | (char*) &dld_cache_p->load_map_addr, | |
1136 | sizeof(dld_cache_p->load_map_addr)) | |
1137 | != 0) | |
1138 | { | |
1139 | error ("Error while reading in .dynamic section of the program."); | |
1140 | } | |
1141 | } | |
1142 | else | |
1143 | { | |
1144 | /* tag is not of interest */ | |
1145 | } | |
1146 | } | |
1147 | ||
1148 | /* Record other information and set is_valid to 1. */ | |
1149 | dld_cache_p->dyninfo_sect = dyninfo_sect; | |
1150 | ||
1151 | /* Verify that we read in required info. These fields are re-set to zero | |
1152 | in pa64_solib_restart. */ | |
1153 | ||
1154 | if (dld_cache_p->dld_flags_addr != 0 && dld_cache_p->load_map_addr != 0) | |
1155 | dld_cache_p->is_valid = 1; | |
1156 | else | |
1157 | return 0; | |
1158 | ||
1159 | return 1; | |
1160 | } | |
1161 | ||
1162 | /* Wrapper for target_read_memory to make dlgetmodinfo happy. */ | |
1163 | ||
1164 | static void * | |
1165 | pa64_target_read_memory (buffer, ptr, bufsiz, ident) | |
1166 | void *buffer; | |
1167 | CORE_ADDR ptr; | |
1168 | size_t bufsiz; | |
1169 | int ident; | |
1170 | { | |
1171 | if (target_read_memory (ptr, buffer, bufsiz) != 0) | |
1172 | return 0; | |
1173 | return buffer; | |
1174 | } | |
1175 | ||
1176 | /* Called from handle_dynlink_load_event and pa64_solib_add to add | |
1177 | a shared library to so_list_head list and possibly to read in the | |
1178 | debug information for the library. | |
1179 | ||
1180 | If load_module_desc_p is NULL, then the load module descriptor must | |
1181 | be read from the inferior process at the address load_module_desc_addr. */ | |
1182 | ||
1183 | static void | |
1184 | add_to_solist (from_tty, dll_path, load_module_desc_p, | |
1185 | load_module_desc_addr, target) | |
1186 | boolean from_tty; | |
1187 | char *dll_path; | |
1188 | struct load_module_desc *load_module_desc_p; | |
1189 | CORE_ADDR load_module_desc_addr; | |
1190 | struct target_ops *target; | |
1191 | { | |
1192 | struct so_list *new_so, *so_list_tail; | |
1193 | int pa64_solib_st_size_threshhold_exceeded; | |
1194 | LONGEST st_size; | |
1195 | ||
1196 | if (symfile_objfile == NULL) | |
1197 | return; | |
1198 | ||
1199 | so_list_tail = so_list_head; | |
1200 | /* Find the end of the list of shared objects. */ | |
1201 | while (so_list_tail && so_list_tail->next) | |
1202 | { | |
1203 | if (strcmp (so_list_tail->name, dll_path) == 0) | |
1204 | return; | |
1205 | so_list_tail = so_list_tail->next; | |
1206 | } | |
1207 | ||
1208 | if (so_list_tail && strcmp (so_list_tail->name, dll_path) == 0) | |
1209 | return; | |
1210 | ||
1211 | /* Add the shared library to the so_list_head list */ | |
1212 | new_so = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
1213 | memset ((char *)new_so, 0, sizeof (struct so_list)); | |
1214 | if (so_list_head == NULL) | |
1215 | { | |
1216 | so_list_head = new_so; | |
1217 | so_list_tail = new_so; | |
1218 | } | |
1219 | else | |
1220 | { | |
1221 | so_list_tail->next = new_so; | |
1222 | so_list_tail = new_so; | |
1223 | } | |
1224 | ||
1225 | /* Initialize the new_so */ | |
1226 | if (load_module_desc_p) | |
1227 | { | |
1228 | new_so->pa64_solib_desc = *load_module_desc_p; | |
1229 | } | |
1230 | else | |
1231 | { | |
1232 | if (target_read_memory (load_module_desc_addr, | |
1233 | (char*) &new_so->pa64_solib_desc, | |
1234 | sizeof(struct load_module_desc)) | |
1235 | != 0) | |
1236 | { | |
1237 | error ("Error while reading in dynamic library %s", dll_path); | |
1238 | } | |
1239 | } | |
1240 | ||
1241 | new_so->pa64_solib_desc_addr = load_module_desc_addr; | |
1242 | new_so->loaded = 1; | |
1243 | new_so->name = obsavestring (dll_path, strlen(dll_path), | |
1244 | &symfile_objfile->symbol_obstack); | |
1245 | ||
1246 | /* If we are not going to load the library, tell the user if we | |
1247 | haven't already and return. */ | |
1248 | ||
1249 | st_size = pa64_solib_sizeof_symbol_table (dll_path); | |
1250 | pa64_solib_st_size_threshhold_exceeded = | |
1251 | !from_tty | |
1252 | && ( (st_size + pa64_solib_total_st_size) | |
1253 | > (auto_solib_add * (LONGEST)1000000)); | |
1254 | if (pa64_solib_st_size_threshhold_exceeded) | |
1255 | { | |
1256 | pa64_solib_add_solib_objfile (new_so, dll_path, from_tty, 1); | |
1257 | return; | |
1258 | } | |
1259 | ||
1260 | /* Now read in debug info. */ | |
1261 | pa64_solib_total_st_size += st_size; | |
1262 | ||
1263 | /* This fills in new_so->objfile, among others. */ | |
1264 | pa64_solib_load_symbols (new_so, | |
1265 | dll_path, | |
1266 | from_tty, | |
1267 | 0); | |
1268 | return; | |
1269 | } | |
1270 | ||
1271 | ||
1272 | /* | |
1273 | LOCAL FUNCTION | |
1274 | ||
1275 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
1276 | ||
1277 | SYNOPSIS | |
1278 | ||
1279 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) | |
1280 | ||
1281 | DESCRIPTION | |
1282 | ||
1283 | An expensive way to lookup the value of a single symbol for | |
1284 | bfd's that are only temporary anyway. This is used by the | |
1285 | shared library support to find the address of the debugger | |
1286 | interface structures in the shared library. | |
1287 | ||
1288 | Note that 0 is specifically allowed as an error return (no | |
1289 | such symbol). | |
1290 | */ | |
1291 | ||
1292 | static CORE_ADDR | |
1293 | bfd_lookup_symbol (abfd, symname) | |
1294 | bfd *abfd; | |
1295 | char *symname; | |
1296 | { | |
1297 | unsigned int storage_needed; | |
1298 | asymbol *sym; | |
1299 | asymbol **symbol_table; | |
1300 | unsigned int number_of_symbols; | |
1301 | unsigned int i; | |
1302 | struct cleanup *back_to; | |
1303 | CORE_ADDR symaddr = 0; | |
1304 | ||
1305 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
1306 | ||
1307 | if (storage_needed > 0) | |
1308 | { | |
1309 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
1310 | back_to = make_cleanup (free, (PTR) symbol_table); | |
1311 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
1312 | ||
1313 | for (i = 0; i < number_of_symbols; i++) | |
1314 | { | |
1315 | sym = *symbol_table++; | |
1316 | if (STREQ (sym->name, symname)) | |
1317 | { | |
1318 | /* Bfd symbols are section relative. */ | |
1319 | symaddr = sym->value + sym->section->vma; | |
1320 | break; | |
1321 | } | |
1322 | } | |
1323 | do_cleanups (back_to); | |
1324 | } | |
1325 | return (symaddr); | |
1326 | } | |
1327 |