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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 | ||
a14ed312 | 62 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *); |
53a5351d | 63 | /* This lives in hppa-tdep.c. */ |
a14ed312 | 64 | extern struct unwind_table_entry *find_unwind_entry (CORE_ADDR pc); |
53a5351d JM |
65 | |
66 | /* These ought to be defined in some public interface, but aren't. They | |
67 | identify dynamic linker events. */ | |
68 | #define DLD_CB_LOAD 1 | |
69 | #define DLD_CB_UNLOAD 0 | |
70 | ||
71 | /* A structure to keep track of all the known shared objects. */ | |
72 | struct so_list | |
73 | { | |
74 | bfd *abfd; | |
75 | char *name; | |
76 | struct so_list *next; | |
77 | struct objfile *objfile; | |
78 | CORE_ADDR pa64_solib_desc_addr; | |
79 | struct load_module_desc pa64_solib_desc; | |
80 | struct section_table *sections; | |
81 | struct section_table *sections_end; | |
82 | boolean loaded; | |
83 | }; | |
84 | ||
85 | static struct so_list *so_list_head; | |
86 | ||
87 | /* This is the cumulative size in bytes of the symbol tables of all | |
88 | shared objects on the so_list_head list. (When we say size, here | |
89 | we mean of the information before it is brought into memory and | |
90 | potentially expanded by GDB.) When adding a new shlib, this value | |
91 | is compared against the threshold size, held by auto_solib_add | |
92 | (in megabytes). If adding symbols for the new shlib would cause | |
93 | the total size to exceed the threshold, then the new shlib's symbols | |
94 | are not loaded. */ | |
95 | static LONGEST pa64_solib_total_st_size; | |
96 | ||
97 | /* When the threshold is reached for any shlib, we refuse to add | |
98 | symbols for subsequent shlibs, even if those shlibs' symbols would | |
99 | be small enough to fit under the threshold. (Although this may | |
100 | result in one, early large shlib preventing the loading of later, | |
101 | smalller shlibs' symbols, it allows us to issue one informational | |
102 | message. The alternative, to issue a message for each shlib whose | |
103 | symbols aren't loaded, could be a big annoyance where the threshold | |
104 | is exceeded due to a very large number of shlibs.) */ | |
105 | static int pa64_solib_st_size_threshold_exceeded; | |
106 | ||
107 | /* When adding fields, be sure to clear them in _initialize_pa64_solib. */ | |
108 | typedef struct | |
109 | { | |
110 | CORE_ADDR dld_flags_addr; | |
111 | long long dld_flags; | |
112 | sec_ptr dyninfo_sect; | |
113 | boolean have_read_dld_descriptor; | |
114 | boolean is_valid; | |
115 | CORE_ADDR load_map; | |
116 | CORE_ADDR load_map_addr; | |
117 | struct load_module_desc dld_desc; | |
118 | } | |
119 | dld_cache_t; | |
120 | ||
121 | static dld_cache_t dld_cache; | |
122 | ||
a14ed312 | 123 | static void pa64_sharedlibrary_info_command (char *, int); |
53a5351d | 124 | |
a14ed312 | 125 | static void pa64_solib_sharedlibrary_command (char *, int); |
53a5351d | 126 | |
a14ed312 | 127 | static void *pa64_target_read_memory (void *, CORE_ADDR, size_t, int); |
53a5351d | 128 | |
a14ed312 | 129 | static boolean read_dld_descriptor (struct target_ops *); |
53a5351d | 130 | |
a14ed312 | 131 | static boolean read_dynamic_info (asection *, dld_cache_t *); |
53a5351d | 132 | |
a14ed312 KB |
133 | static void add_to_solist (boolean, char *, struct load_module_desc *, |
134 | CORE_ADDR, struct target_ops *); | |
53a5351d JM |
135 | |
136 | /* When examining the shared library for debugging information we have to | |
137 | look for HP debug symbols, stabs and dwarf2 debug symbols. */ | |
138 | static char *pa64_debug_section_names[] = { | |
139 | ".debug_header", ".debug_gntt", ".debug_lntt", ".debug_slt", ".debug_vt", | |
140 | ".stabs", ".stabstr", ".debug_info", ".debug_abbrev", ".debug_aranges", | |
141 | ".debug_macinfo", ".debug_line", ".debug_loc", ".debug_pubnames", | |
142 | ".debug_str", NULL | |
143 | }; | |
144 | ||
145 | /* Return a ballbark figure for the amount of memory GDB will need to | |
146 | allocate to read in the debug symbols from FILENAME. */ | |
147 | static LONGEST | |
fba45db2 | 148 | pa64_solib_sizeof_symbol_table (char *filename) |
53a5351d JM |
149 | { |
150 | bfd *abfd; | |
151 | int i; | |
152 | int desc; | |
153 | char *absolute_name; | |
154 | LONGEST st_size = (LONGEST) 0; | |
155 | asection *sect; | |
156 | ||
157 | /* We believe that filename was handed to us by the dynamic linker, and | |
158 | is therefore always an absolute path. */ | |
159 | desc = openp (getenv ("PATH"), 1, filename, O_RDONLY | O_BINARY, | |
160 | 0, &absolute_name); | |
161 | if (desc < 0) | |
162 | { | |
163 | perror_with_name (filename); | |
164 | } | |
165 | filename = absolute_name; | |
166 | ||
167 | abfd = bfd_fdopenr (filename, gnutarget, desc); | |
168 | if (!abfd) | |
169 | { | |
170 | close (desc); | |
b8c9b27d | 171 | make_cleanup (xfree, filename); |
53a5351d JM |
172 | error ("\"%s\": can't open to read symbols: %s.", filename, |
173 | bfd_errmsg (bfd_get_error ())); | |
174 | } | |
175 | ||
176 | if (!bfd_check_format (abfd, bfd_object)) | |
177 | { | |
178 | bfd_close (abfd); | |
b8c9b27d | 179 | make_cleanup (xfree, filename); |
53a5351d JM |
180 | error ("\"%s\": can't read symbols: %s.", filename, |
181 | bfd_errmsg (bfd_get_error ())); | |
182 | } | |
183 | ||
184 | /* Sum the sizes of the various sections that compose debug info. */ | |
185 | for (i = 0; pa64_debug_section_names[i] != NULL; i++) | |
186 | { | |
187 | asection *sect; | |
188 | ||
189 | sect = bfd_get_section_by_name (abfd, pa64_debug_section_names[i]); | |
190 | if (sect) | |
191 | st_size += (LONGEST)bfd_section_size (abfd, sect); | |
192 | } | |
193 | ||
194 | bfd_close (abfd); | |
b8c9b27d | 195 | xfree (filename); |
53a5351d JM |
196 | |
197 | /* Unfortunately, just summing the sizes of various debug info | |
198 | sections isn't a very accurate measurement of how much heap | |
199 | space the debugger will need to hold them. It also doesn't | |
200 | account for space needed by linker (aka "minimal") symbols. | |
201 | ||
202 | Anecdotal evidence suggests that just summing the sizes of | |
203 | debug-info-related sections understates the heap space needed | |
204 | to represent it internally by about an order of magnitude. | |
205 | ||
206 | Since it's not exactly brain surgery we're doing here, rather | |
207 | than attempt to more accurately measure the size of a shlib's | |
208 | symbol table in GDB's heap, we'll just apply a 10x fudge- | |
209 | factor to the debug info sections' size-sum. No, this doesn't | |
210 | account for minimal symbols in non-debuggable shlibs. But it | |
211 | all roughly washes out in the end. */ | |
212 | return st_size * (LONGEST) 10; | |
213 | } | |
214 | ||
215 | /* Add a shared library to the objfile list and load its symbols into | |
216 | GDB's symbol table. */ | |
217 | static void | |
fba45db2 KB |
218 | pa64_solib_add_solib_objfile (struct so_list *so, char *name, int from_tty, |
219 | CORE_ADDR text_addr) | |
53a5351d JM |
220 | { |
221 | bfd *tmp_bfd; | |
222 | asection *sec; | |
223 | obj_private_data_t *obj_private; | |
2acceee2 | 224 | struct section_addr_info section_addrs; |
53a5351d | 225 | |
2acceee2 | 226 | memset (§ion_addrs, 0, sizeof (section_addrs)); |
53a5351d JM |
227 | /* We need the BFD so that we can look at its sections. We open up the |
228 | file temporarily, then close it when we are done. */ | |
229 | tmp_bfd = bfd_openr (name, gnutarget); | |
230 | if (tmp_bfd == NULL) | |
231 | { | |
232 | perror_with_name (name); | |
233 | return; | |
234 | } | |
235 | ||
236 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
237 | { | |
238 | bfd_close (tmp_bfd); | |
239 | error ("\"%s\" is not an object file: %s", name, | |
240 | bfd_errmsg (bfd_get_error ())); | |
241 | } | |
242 | ||
243 | ||
244 | /* Undo some braindamage from symfile.c. | |
245 | ||
246 | First, symfile.c will subtract the VMA of the first .text section | |
247 | in the shared library that it finds. Undo that. */ | |
248 | sec = bfd_get_section_by_name (tmp_bfd, ".text"); | |
249 | text_addr += bfd_section_vma (tmp_bfd, sec); | |
250 | ||
251 | /* Now find the true lowest section in the shared library. */ | |
252 | sec = NULL; | |
253 | bfd_map_over_sections (tmp_bfd, find_lowest_section, (PTR) &sec); | |
254 | ||
255 | if (sec) | |
256 | { | |
257 | /* Subtract out the VMA of the lowest section. */ | |
258 | text_addr -= bfd_section_vma (tmp_bfd, sec); | |
259 | ||
260 | /* ??? Add back in the filepos of that lowest section. */ | |
261 | text_addr += sec->filepos; | |
262 | } | |
263 | ||
264 | /* We are done with the temporary bfd. Get rid of it and make sure | |
265 | nobody else can us it. */ | |
266 | bfd_close (tmp_bfd); | |
267 | tmp_bfd = NULL; | |
268 | ||
269 | /* Now let the generic code load up symbols for this library. */ | |
a034fba4 EZ |
270 | section_addrs.other[0].addr = text_addr; |
271 | section_addrs.other[0].name = ".text"; | |
2df3850c | 272 | so->objfile = symbol_file_add (name, from_tty, §ion_addrs, 0, OBJF_SHARED); |
53a5351d JM |
273 | so->abfd = so->objfile->obfd; |
274 | ||
275 | /* Mark this as a shared library and save private data. */ | |
276 | so->objfile->flags |= OBJF_SHARED; | |
277 | ||
278 | if (so->objfile->obj_private == NULL) | |
279 | { | |
280 | obj_private = (obj_private_data_t *) | |
281 | obstack_alloc (&so->objfile->psymbol_obstack, | |
282 | sizeof (obj_private_data_t)); | |
283 | obj_private->unwind_info = NULL; | |
284 | obj_private->so_info = NULL; | |
285 | so->objfile->obj_private = (PTR) obj_private; | |
286 | } | |
287 | ||
288 | obj_private = (obj_private_data_t *) so->objfile->obj_private; | |
289 | obj_private->so_info = so; | |
290 | obj_private->dp = so->pa64_solib_desc.linkage_ptr; | |
291 | } | |
292 | ||
293 | /* Load debugging information for a shared library. TARGET may be | |
294 | NULL if we are not attaching to a process or reading a core file. */ | |
295 | ||
296 | static void | |
fba45db2 KB |
297 | pa64_solib_load_symbols (struct so_list *so, char *name, int from_tty, |
298 | CORE_ADDR text_addr, struct target_ops *target) | |
53a5351d JM |
299 | { |
300 | struct section_table *p; | |
301 | asection *sec; | |
302 | int status; | |
303 | char buf[4]; | |
304 | CORE_ADDR presumed_data_start; | |
305 | ||
306 | if (text_addr == 0) | |
307 | text_addr = so->pa64_solib_desc.text_base; | |
308 | ||
309 | pa64_solib_add_solib_objfile (so, name, from_tty, text_addr); | |
310 | ||
311 | /* Now we need to build a section table for this library since | |
312 | we might be debugging a core file from a dynamically linked | |
313 | executable in which the libraries were not privately mapped. */ | |
314 | if (build_section_table (so->abfd, | |
315 | &so->sections, | |
316 | &so->sections_end)) | |
317 | { | |
318 | error ("Unable to build section table for shared library\n."); | |
319 | return; | |
320 | } | |
321 | ||
f0a58b0b | 322 | (so->objfile->section_offsets)->offsets[SECT_OFF_TEXT (so->objfile)] |
53a5351d | 323 | = so->pa64_solib_desc.text_base; |
f0a58b0b | 324 | (so->objfile->section_offsets)->offsets[SECT_OFF_DATA (so->objfile)] |
53a5351d JM |
325 | = so->pa64_solib_desc.data_base; |
326 | ||
327 | /* Relocate all the sections based on where they got loaded. */ | |
328 | for (p = so->sections; p < so->sections_end; p++) | |
329 | { | |
330 | if (p->the_bfd_section->flags & SEC_CODE) | |
331 | { | |
b8fbeb18 EZ |
332 | p->addr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT (so->objfile)); |
333 | p->endaddr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT (so->objfile)); | |
53a5351d JM |
334 | } |
335 | else if (p->the_bfd_section->flags & SEC_DATA) | |
336 | { | |
b8fbeb18 EZ |
337 | p->addr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA (so->objfile)); |
338 | p->endaddr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA (so->objfile)); | |
53a5351d JM |
339 | } |
340 | } | |
341 | ||
342 | /* Now see if we need to map in the text and data for this shared | |
343 | library (for example debugging a core file which does not use | |
344 | private shared libraries.). | |
345 | ||
346 | Carefully peek at the first text address in the library. If the | |
347 | read succeeds, then the libraries were privately mapped and were | |
348 | included in the core dump file. | |
349 | ||
350 | If the peek failed, then the libraries were not privately mapped | |
351 | and are not in the core file, we'll have to read them in ourselves. */ | |
352 | status = target_read_memory (text_addr, buf, 4); | |
353 | if (status != 0) | |
354 | { | |
6426a772 JM |
355 | int new, old; |
356 | ||
53a5351d | 357 | new = so->sections_end - so->sections; |
53a5351d | 358 | |
6426a772 JM |
359 | old = target_resize_to_sections (target, new); |
360 | ||
53a5351d JM |
361 | /* Copy over the old data before it gets clobbered. */ |
362 | memcpy ((char *) (target->to_sections + old), | |
363 | so->sections, | |
364 | ((sizeof (struct section_table)) * new)); | |
365 | } | |
366 | } | |
367 | ||
368 | ||
369 | /* Add symbols from shared libraries into the symtab list, unless the | |
370 | size threshold (specified by auto_solib_add, in megabytes) would | |
371 | be exceeded. */ | |
372 | ||
373 | void | |
fba45db2 | 374 | pa64_solib_add (char *arg_string, int from_tty, struct target_ops *target) |
53a5351d JM |
375 | { |
376 | struct minimal_symbol *msymbol; | |
377 | CORE_ADDR addr; | |
378 | asection *shlib_info; | |
379 | int status; | |
380 | unsigned int dld_flags; | |
381 | char buf[4], *re_err; | |
382 | int threshold_warning_given = 0; | |
383 | int dll_index; | |
384 | struct load_module_desc dll_desc; | |
385 | char *dll_path; | |
386 | ||
387 | /* First validate our arguments. */ | |
388 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) | |
389 | { | |
390 | error ("Invalid regexp: %s", re_err); | |
391 | } | |
392 | ||
393 | /* If we're debugging a core file, or have attached to a running | |
394 | process, then pa64_solib_create_inferior_hook will not have been | |
395 | called. | |
396 | ||
397 | We need to first determine if we're dealing with a dynamically | |
398 | linked executable. If not, then return without an error or warning. | |
399 | ||
400 | We also need to examine __dld_flags to determine if the shared library | |
401 | list is valid and to determine if the libraries have been privately | |
402 | mapped. */ | |
403 | if (symfile_objfile == NULL) | |
404 | return; | |
405 | ||
406 | /* First see if the objfile was dynamically linked. */ | |
407 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, ".dynamic"); | |
408 | if (!shlib_info) | |
409 | return; | |
410 | ||
411 | /* It's got a .dynamic section, make sure it's not empty. */ | |
412 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) | |
413 | return; | |
414 | ||
415 | /* Read in the load map pointer if we have not done so already. */ | |
416 | if (! dld_cache.have_read_dld_descriptor) | |
417 | if (! read_dld_descriptor (target)) | |
418 | return; | |
419 | ||
420 | /* If the libraries were not mapped private, warn the user. */ | |
421 | if ((dld_cache.dld_flags & DT_HP_DEBUG_PRIVATE) == 0) | |
422 | warning ("The shared libraries were not privately mapped; setting a\nbreakpoint in a shared library will not work until you rerun the program.\n"); | |
423 | ||
424 | /* For each shaerd library, add it to the shared library list. */ | |
425 | for (dll_index = 1; ; dll_index++) | |
426 | { | |
427 | /* Read in the load module descriptor. */ | |
428 | if (dlgetmodinfo (dll_index, &dll_desc, sizeof (dll_desc), | |
429 | pa64_target_read_memory, 0, dld_cache.load_map) | |
430 | == 0) | |
431 | return; | |
432 | ||
433 | /* Get the name of the shared library. */ | |
434 | dll_path = (char *)dlgetname (&dll_desc, sizeof (dll_desc), | |
435 | pa64_target_read_memory, | |
436 | 0, dld_cache.load_map); | |
437 | ||
438 | if (!dll_path) | |
439 | error ("pa64_solib_add, unable to read shared library path."); | |
440 | ||
441 | add_to_solist (from_tty, dll_path, &dll_desc, 0, target); | |
442 | } | |
443 | } | |
444 | ||
445 | ||
446 | /* This hook gets called just before the first instruction in the | |
447 | inferior process is executed. | |
448 | ||
449 | This is our opportunity to set magic flags in the inferior so | |
450 | that GDB can be notified when a shared library is mapped in and | |
451 | to tell the dynamic linker that a private copy of the library is | |
452 | needed (so GDB can set breakpoints in the library). | |
453 | ||
454 | We need to set two flag bits in this routine. | |
455 | ||
456 | DT_HP_DEBUG_PRIVATE to indicate that shared libraries should be | |
457 | mapped private. | |
458 | ||
459 | DT_HP_DEBUG_CALLBACK to indicate that we want the dynamic linker to | |
460 | call the breakpoint routine for significant events. */ | |
461 | ||
462 | void | |
fba45db2 | 463 | pa64_solib_create_inferior_hook (void) |
53a5351d JM |
464 | { |
465 | struct minimal_symbol *msymbol; | |
466 | unsigned int dld_flags, status; | |
467 | asection *shlib_info, *interp_sect; | |
468 | char buf[4]; | |
469 | struct objfile *objfile; | |
470 | CORE_ADDR anaddr; | |
471 | ||
472 | /* First, remove all the solib event breakpoints. Their addresses | |
473 | may have changed since the last time we ran the program. */ | |
474 | remove_solib_event_breakpoints (); | |
475 | ||
476 | if (symfile_objfile == NULL) | |
477 | return; | |
478 | ||
479 | /* First see if the objfile was dynamically linked. */ | |
480 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, ".dynamic"); | |
481 | if (!shlib_info) | |
482 | return; | |
483 | ||
484 | /* It's got a .dynamic section, make sure it's not empty. */ | |
485 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) | |
486 | return; | |
487 | ||
53a5351d JM |
488 | /* Read in the .dynamic section. */ |
489 | if (! read_dynamic_info (shlib_info, &dld_cache)) | |
490 | error ("Unable to read the .dynamic section."); | |
491 | ||
492 | /* Turn on the flags we care about. */ | |
493 | dld_cache.dld_flags |= DT_HP_DEBUG_PRIVATE; | |
53a5351d | 494 | dld_cache.dld_flags |= DT_HP_DEBUG_CALLBACK; |
53a5351d JM |
495 | status = target_write_memory (dld_cache.dld_flags_addr, |
496 | (char *) &dld_cache.dld_flags, | |
497 | sizeof (dld_cache.dld_flags)); | |
498 | if (status != 0) | |
499 | error ("Unable to modify dynamic linker flags."); | |
500 | ||
501 | /* Now we have to create a shared library breakpoint in the dynamic | |
502 | linker. This can be somewhat tricky since the symbol is inside | |
503 | the dynamic linker (for which we do not have symbols or a base | |
504 | load address! Luckily I wrote this code for solib.c years ago. */ | |
505 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
506 | if (interp_sect) | |
507 | { | |
508 | unsigned int interp_sect_size; | |
509 | char *buf; | |
510 | CORE_ADDR load_addr; | |
511 | bfd *tmp_bfd; | |
512 | CORE_ADDR sym_addr = 0; | |
513 | ||
514 | /* Read the contents of the .interp section into a local buffer; | |
515 | the contents specify the dynamic linker this program uses. */ | |
516 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); | |
517 | buf = alloca (interp_sect_size); | |
518 | bfd_get_section_contents (exec_bfd, interp_sect, | |
519 | buf, 0, interp_sect_size); | |
520 | ||
521 | /* Now we need to figure out where the dynamic linker was | |
522 | loaded so that we can load its symbols and place a breakpoint | |
523 | in the dynamic linker itself. | |
524 | ||
525 | This address is stored on the stack. However, I've been unable | |
526 | to find any magic formula to find it for Solaris (appears to | |
527 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
528 | mechanism to find the dynamic linker's base address. */ | |
529 | tmp_bfd = bfd_openr (buf, gnutarget); | |
530 | if (tmp_bfd == NULL) | |
531 | goto get_out; | |
532 | ||
533 | /* Make sure the dynamic linker's really a useful object. */ | |
534 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
535 | { | |
536 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |
537 | bfd_close (tmp_bfd); | |
538 | goto get_out; | |
539 | } | |
540 | ||
541 | /* We find the dynamic linker's base address by examining the | |
542 | current pc (which point at the entry point for the dynamic | |
543 | linker) and subtracting the offset of the entry point. | |
544 | ||
545 | Also note the breakpoint is the second instruction in the | |
546 | routine. */ | |
547 | load_addr = read_pc () - tmp_bfd->start_address; | |
548 | sym_addr = bfd_lookup_symbol (tmp_bfd, "__dld_break"); | |
549 | sym_addr = load_addr + sym_addr + 4; | |
550 | ||
551 | /* Create the shared library breakpoint. */ | |
c2c6d25f JM |
552 | { |
553 | struct breakpoint *b | |
554 | = create_solib_event_breakpoint (sym_addr); | |
555 | ||
556 | /* The breakpoint is actually hard-coded into the dynamic linker, | |
557 | so we don't need to actually insert a breakpoint instruction | |
558 | there. In fact, the dynamic linker's code is immutable, even to | |
559 | ttrace, so we shouldn't even try to do that. For cases like | |
560 | this, we have "permanent" breakpoints. */ | |
561 | make_breakpoint_permanent (b); | |
562 | } | |
53a5351d JM |
563 | |
564 | /* We're done with the temporary bfd. */ | |
565 | bfd_close (tmp_bfd); | |
566 | } | |
567 | ||
568 | get_out: | |
569 | /* Wipe out all knowledge of old shared libraries since their | |
570 | mapping can change from one exec to another! */ | |
571 | while (so_list_head) | |
572 | { | |
573 | struct so_list *temp; | |
574 | ||
575 | temp = so_list_head; | |
b8c9b27d | 576 | xfree (so_list_head); |
53a5351d JM |
577 | so_list_head = temp->next; |
578 | } | |
579 | clear_symtab_users (); | |
580 | } | |
581 | ||
582 | /* This operation removes the "hook" between GDB and the dynamic linker, | |
583 | which causes the dld to notify GDB of shared library events. | |
584 | ||
585 | After this operation completes, the dld will no longer notify GDB of | |
586 | shared library events. To resume notifications, GDB must call | |
587 | pa64_solib_create_inferior_hook. | |
588 | ||
589 | This operation does not remove any knowledge of shared libraries which | |
590 | GDB may already have been notified of. */ | |
591 | ||
592 | void | |
fba45db2 | 593 | pa64_solib_remove_inferior_hook (int pid) |
53a5351d JM |
594 | { |
595 | /* Turn off the DT_HP_DEBUG_CALLBACK bit in the dynamic linker flags. */ | |
596 | dld_cache.dld_flags &= ~DT_HP_DEBUG_CALLBACK; | |
597 | target_write_memory (dld_cache.dld_flags_addr, | |
598 | (char *)&dld_cache.dld_flags, | |
599 | sizeof (dld_cache.dld_flags)); | |
600 | } | |
601 | ||
602 | /* This function creates a breakpoint on the dynamic linker hook, which | |
603 | is called when e.g., a shl_load or shl_unload call is made. This | |
604 | breakpoint will only trigger when a shl_load call is made. | |
605 | ||
606 | If filename is NULL, then loads of any dll will be caught. Else, | |
607 | only loads of the file whose pathname is the string contained by | |
608 | filename will be caught. | |
609 | ||
610 | Undefined behaviour is guaranteed if this function is called before | |
611 | pa64_solib_create_inferior_hook. */ | |
612 | ||
613 | void | |
fba45db2 KB |
614 | pa64_solib_create_catch_load_hook (int pid, int tempflag, char *filename, |
615 | char *cond_string) | |
53a5351d JM |
616 | { |
617 | create_solib_load_event_breakpoint ("", tempflag, filename, cond_string); | |
618 | } | |
619 | ||
620 | /* This function creates a breakpoint on the dynamic linker hook, which | |
621 | is called when e.g., a shl_load or shl_unload call is made. This | |
622 | breakpoint will only trigger when a shl_unload call is made. | |
623 | ||
624 | If filename is NULL, then unloads of any dll will be caught. Else, | |
625 | only unloads of the file whose pathname is the string contained by | |
626 | filename will be caught. | |
627 | ||
628 | Undefined behaviour is guaranteed if this function is called before | |
629 | pa64_solib_create_inferior_hook. */ | |
630 | ||
631 | void | |
fba45db2 KB |
632 | pa64_solib_create_catch_unload_hook (int pid, int tempflag, char *filename, |
633 | char *cond_string) | |
53a5351d JM |
634 | { |
635 | create_solib_unload_event_breakpoint ("", tempflag, filename, cond_string); | |
636 | } | |
637 | ||
638 | /* Return nonzero if the dynamic linker has reproted that a library | |
639 | has been loaded. */ | |
640 | ||
641 | int | |
fba45db2 | 642 | pa64_solib_have_load_event (int pid) |
53a5351d JM |
643 | { |
644 | CORE_ADDR event_kind; | |
645 | ||
646 | event_kind = read_register (ARG0_REGNUM); | |
647 | return (event_kind == DLD_CB_LOAD); | |
648 | } | |
649 | ||
650 | /* Return nonzero if the dynamic linker has reproted that a library | |
651 | has been unloaded. */ | |
652 | int | |
fba45db2 | 653 | pa64_solib_have_unload_event (int pid) |
53a5351d JM |
654 | { |
655 | CORE_ADDR event_kind; | |
656 | ||
657 | event_kind = read_register (ARG0_REGNUM); | |
658 | return (event_kind == DLD_CB_UNLOAD); | |
659 | } | |
660 | ||
661 | /* Return a pointer to a string indicating the pathname of the most | |
662 | recently loaded library. | |
663 | ||
664 | The caller is reposible for copying the string before the inferior is | |
665 | restarted. */ | |
666 | ||
667 | char * | |
fba45db2 | 668 | pa64_solib_loaded_library_pathname (int pid) |
53a5351d JM |
669 | { |
670 | static char dll_path[MAXPATHLEN]; | |
671 | CORE_ADDR dll_path_addr = read_register (ARG3_REGNUM); | |
672 | read_memory_string (dll_path_addr, dll_path, MAXPATHLEN); | |
673 | return dll_path; | |
674 | } | |
675 | ||
676 | /* Return a pointer to a string indicating the pathname of the most | |
677 | recently unloaded library. | |
678 | ||
679 | The caller is reposible for copying the string before the inferior is | |
680 | restarted. */ | |
681 | ||
682 | char * | |
fba45db2 | 683 | pa64_solib_unloaded_library_pathname (int pid) |
53a5351d JM |
684 | { |
685 | static char dll_path[MAXPATHLEN]; | |
686 | CORE_ADDR dll_path_addr = read_register (ARG3_REGNUM); | |
687 | read_memory_string (dll_path_addr, dll_path, MAXPATHLEN); | |
688 | return dll_path; | |
689 | } | |
690 | ||
691 | /* Return nonzero if PC is an address inside the dynamic linker. */ | |
692 | ||
693 | int | |
fba45db2 | 694 | pa64_solib_in_dynamic_linker (int pid, CORE_ADDR pc) |
53a5351d JM |
695 | { |
696 | asection *shlib_info; | |
697 | ||
698 | if (symfile_objfile == NULL) | |
699 | return 0; | |
700 | ||
701 | if (!dld_cache.have_read_dld_descriptor) | |
702 | if (!read_dld_descriptor (¤t_target)) | |
703 | return 0; | |
704 | ||
705 | return (pc >= dld_cache.dld_desc.text_base | |
706 | && pc < dld_cache.dld_desc.text_base + dld_cache.dld_desc.text_size); | |
707 | } | |
708 | ||
709 | ||
710 | /* Return the GOT value for the shared library in which ADDR belongs. If | |
711 | ADDR isn't in any known shared library, return zero. */ | |
712 | ||
713 | CORE_ADDR | |
fba45db2 | 714 | pa64_solib_get_got_by_pc (CORE_ADDR addr) |
53a5351d JM |
715 | { |
716 | struct so_list *so_list = so_list_head; | |
717 | CORE_ADDR got_value = 0; | |
718 | ||
719 | while (so_list) | |
720 | { | |
721 | if (so_list->pa64_solib_desc.text_base <= addr | |
722 | && ((so_list->pa64_solib_desc.text_base | |
723 | + so_list->pa64_solib_desc.text_size) | |
724 | > addr)) | |
725 | { | |
726 | got_value = so_list->pa64_solib_desc.linkage_ptr; | |
727 | break; | |
728 | } | |
729 | so_list = so_list->next; | |
730 | } | |
731 | return got_value; | |
732 | } | |
733 | ||
734 | /* Return the address of the handle of the shared library in which ADDR | |
735 | belongs. If ADDR isn't in any known shared library, return zero. | |
736 | ||
737 | This function is used in hppa_fix_call_dummy in hppa-tdep.c. */ | |
738 | ||
739 | CORE_ADDR | |
fba45db2 | 740 | pa64_solib_get_solib_by_pc (CORE_ADDR addr) |
53a5351d JM |
741 | { |
742 | struct so_list *so_list = so_list_head; | |
743 | CORE_ADDR retval = 0; | |
744 | ||
745 | while (so_list) | |
746 | { | |
747 | if (so_list->pa64_solib_desc.text_base <= addr | |
748 | && ((so_list->pa64_solib_desc.text_base | |
749 | + so_list->pa64_solib_desc.text_size) | |
750 | > addr)) | |
751 | { | |
752 | retval = so_list->pa64_solib_desc_addr; | |
753 | break; | |
754 | } | |
755 | so_list = so_list->next; | |
756 | } | |
757 | return retval; | |
758 | } | |
759 | ||
760 | /* Dump information about all the currently loaded shared libraries. */ | |
761 | ||
762 | static void | |
fba45db2 | 763 | pa64_sharedlibrary_info_command (char *ignore, int from_tty) |
53a5351d JM |
764 | { |
765 | struct so_list *so_list = so_list_head; | |
766 | ||
767 | if (exec_bfd == NULL) | |
768 | { | |
4ce44c66 | 769 | printf_unfiltered ("No executable file.\n"); |
53a5351d JM |
770 | return; |
771 | } | |
772 | ||
773 | if (so_list == NULL) | |
774 | { | |
775 | printf_unfiltered ("No shared libraries loaded at this time.\n"); | |
776 | return; | |
777 | } | |
778 | ||
779 | printf_unfiltered ("Shared Object Libraries\n"); | |
c2c6d25f JM |
780 | printf_unfiltered (" %-19s%-19s%-19s%-19s\n", |
781 | " text start", " text end", | |
782 | " data start", " data end"); | |
53a5351d JM |
783 | while (so_list) |
784 | { | |
785 | unsigned int flags; | |
786 | ||
787 | printf_unfiltered ("%s", so_list->name); | |
788 | if (so_list->objfile == NULL) | |
789 | printf_unfiltered (" (symbols not loaded)"); | |
790 | if (so_list->loaded == 0) | |
791 | printf_unfiltered (" (shared library unloaded)"); | |
792 | printf_unfiltered (" %-18s", | |
793 | local_hex_string_custom (so_list->pa64_solib_desc.linkage_ptr, | |
794 | "016l")); | |
795 | printf_unfiltered ("\n"); | |
796 | printf_unfiltered ("%-18s", | |
797 | local_hex_string_custom (so_list->pa64_solib_desc.text_base, | |
798 | "016l")); | |
799 | printf_unfiltered (" %-18s", | |
c2c6d25f | 800 | local_hex_string_custom ((so_list->pa64_solib_desc.text_base |
53a5351d JM |
801 | + so_list->pa64_solib_desc.text_size), |
802 | "016l")); | |
803 | printf_unfiltered (" %-18s", | |
804 | local_hex_string_custom (so_list->pa64_solib_desc.data_base, | |
805 | "016l")); | |
806 | printf_unfiltered (" %-18s\n", | |
c2c6d25f | 807 | local_hex_string_custom ((so_list->pa64_solib_desc.data_base |
53a5351d JM |
808 | + so_list->pa64_solib_desc.data_size), |
809 | "016l")); | |
810 | so_list = so_list->next; | |
811 | } | |
812 | } | |
813 | ||
814 | /* Load up one or more shared libraries as directed by the user. */ | |
815 | ||
816 | static void | |
fba45db2 | 817 | pa64_solib_sharedlibrary_command (char *args, int from_tty) |
53a5351d JM |
818 | { |
819 | dont_repeat (); | |
820 | pa64_solib_add (args, from_tty, (struct target_ops *) 0); | |
821 | } | |
822 | ||
823 | /* Return the name of the shared library containing ADDR or NULL if ADDR | |
824 | is not contained in any known shared library. */ | |
825 | ||
826 | char * | |
fba45db2 | 827 | pa64_solib_address (CORE_ADDR addr) |
53a5351d JM |
828 | { |
829 | struct so_list *so = so_list_head; | |
830 | ||
831 | while (so) | |
832 | { | |
833 | /* Is this address within this shlib's text range? If so, | |
834 | return the shlib's name. */ | |
835 | if (addr >= so->pa64_solib_desc.text_base | |
836 | && addr < (so->pa64_solib_desc.text_base | |
837 | | so->pa64_solib_desc.text_size)) | |
838 | return so->name; | |
839 | ||
840 | /* Nope, keep looking... */ | |
841 | so = so->next; | |
842 | } | |
843 | ||
844 | /* No, we couldn't prove that the address is within a shlib. */ | |
845 | return NULL; | |
846 | } | |
847 | ||
848 | /* We are killing the inferior and restarting the program. */ | |
849 | ||
850 | void | |
fba45db2 | 851 | pa64_solib_restart (void) |
53a5351d JM |
852 | { |
853 | struct so_list *sl = so_list_head; | |
854 | ||
855 | /* Before the shlib info vanishes, use it to disable any breakpoints | |
856 | that may still be active in those shlibs. */ | |
857 | disable_breakpoints_in_shlibs (0); | |
858 | ||
859 | /* Discard all the shlib descriptors. */ | |
860 | while (sl) | |
861 | { | |
862 | struct so_list *next_sl = sl->next; | |
b8c9b27d | 863 | xfree (sl); |
53a5351d JM |
864 | sl = next_sl; |
865 | } | |
866 | so_list_head = NULL; | |
867 | ||
868 | pa64_solib_total_st_size = (LONGEST) 0; | |
869 | pa64_solib_st_size_threshold_exceeded = 0; | |
870 | ||
871 | dld_cache.is_valid = 0; | |
872 | dld_cache.have_read_dld_descriptor = 0; | |
873 | dld_cache.dld_flags_addr = 0; | |
874 | dld_cache.load_map = 0; | |
875 | dld_cache.load_map_addr = 0; | |
876 | dld_cache.dld_desc.data_base = 0; | |
877 | dld_cache.dld_flags = 0; | |
878 | dld_cache.dyninfo_sect = 0; | |
879 | } | |
880 | ||
881 | void | |
fba45db2 | 882 | _initialize_pa64_solib (void) |
53a5351d JM |
883 | { |
884 | add_com ("sharedlibrary", class_files, pa64_solib_sharedlibrary_command, | |
885 | "Load shared object library symbols for files matching REGEXP."); | |
886 | add_info ("sharedlibrary", pa64_sharedlibrary_info_command, | |
887 | "Status of loaded shared object libraries."); | |
888 | add_show_from_set | |
889 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, | |
890 | (char *) &auto_solib_add, | |
891 | "Set autoloading size threshold (in megabytes) of shared library symbols.\n\ | |
892 | If nonzero, symbols from all shared object libraries will be loaded\n\ | |
893 | automatically when the inferior begins execution or when the dynamic linker\n\ | |
894 | informs gdb that a new library has been loaded, until the symbol table\n\ | |
895 | of the program and libraries exceeds this threshold.\n\ | |
896 | Otherwise, symbols must be loaded manually, using `sharedlibrary'.", | |
897 | &setlist), | |
898 | &showlist); | |
899 | ||
900 | /* ??rehrauer: On HP-UX, the kernel parameter MAXDSIZ limits how much | |
901 | data space a process can use. We ought to be reading MAXDSIZ and | |
902 | setting auto_solib_add to some large fraction of that value. If | |
903 | not that, we maybe ought to be setting it smaller than the default | |
904 | for MAXDSIZ (that being 64Mb, I believe). However, [1] this threshold | |
905 | is only crudely approximated rather than actually measured, and [2] | |
906 | 50 Mbytes is too small for debugging gdb itself. Thus, the arbitrary | |
907 | 100 figure. | |
908 | */ | |
909 | auto_solib_add = 100; /* Megabytes */ | |
910 | ||
911 | pa64_solib_restart (); | |
912 | } | |
913 | ||
914 | /* Get some HPUX-specific data from a shared lib. */ | |
915 | CORE_ADDR | |
fba45db2 | 916 | so_lib_thread_start_addr (struct so_list *so) |
53a5351d JM |
917 | { |
918 | return so->pa64_solib_desc.tls_start_addr; | |
919 | } | |
920 | ||
921 | /* Read the dynamic linker's internal shared library descriptor. | |
922 | ||
923 | This must happen after dld starts running, so we can't do it in | |
924 | read_dynamic_info. Record the fact that we have loaded the | |
925 | descriptor. If the library is archive bound, then return zero, else | |
926 | return nonzero. */ | |
927 | ||
928 | static boolean | |
fba45db2 | 929 | read_dld_descriptor (struct target_ops *target) |
53a5351d JM |
930 | { |
931 | char *dll_path; | |
932 | asection *dyninfo_sect; | |
933 | ||
934 | /* If necessary call read_dynamic_info to extract the contents of the | |
935 | .dynamic section from the shared library. */ | |
936 | if (!dld_cache.is_valid) | |
937 | { | |
938 | if (symfile_objfile == NULL) | |
939 | error ("No object file symbols."); | |
940 | ||
941 | dyninfo_sect = bfd_get_section_by_name (symfile_objfile->obfd, | |
942 | ".dynamic"); | |
943 | if (!dyninfo_sect) | |
944 | { | |
945 | return 0; | |
946 | } | |
947 | ||
948 | if (!read_dynamic_info (dyninfo_sect, &dld_cache)) | |
949 | error ("Unable to read in .dynamic section information."); | |
950 | } | |
951 | ||
952 | /* Read the load map pointer. */ | |
953 | if (target_read_memory (dld_cache.load_map_addr, | |
954 | (char*) &dld_cache.load_map, | |
955 | sizeof(dld_cache.load_map)) | |
956 | != 0) | |
957 | { | |
958 | error ("Error while reading in load map pointer."); | |
959 | } | |
960 | ||
961 | /* Read in the dld load module descriptor */ | |
962 | if (dlgetmodinfo (-1, | |
963 | &dld_cache.dld_desc, | |
964 | sizeof(dld_cache.dld_desc), | |
965 | pa64_target_read_memory, | |
966 | 0, | |
967 | dld_cache.load_map) | |
968 | == 0) | |
969 | { | |
970 | error ("Error trying to get information about dynamic linker."); | |
971 | } | |
972 | ||
973 | /* Indicate that we have loaded the dld descriptor. */ | |
974 | dld_cache.have_read_dld_descriptor = 1; | |
975 | ||
976 | /* Add dld.sl to the list of known shared libraries so that we can | |
977 | do unwind, etc. | |
978 | ||
979 | ?!? This may not be correct. Consider of dld.sl contains symbols | |
980 | which are also referenced/defined by the user program or some user | |
981 | shared library. We need to make absolutely sure that we do not | |
982 | pollute the namespace from GDB's point of view. */ | |
983 | dll_path = dlgetname (&dld_cache.dld_desc, | |
984 | sizeof(dld_cache.dld_desc), | |
985 | pa64_target_read_memory, | |
986 | 0, | |
987 | dld_cache.load_map); | |
988 | add_to_solist(0, dll_path, &dld_cache.dld_desc, 0, target); | |
989 | ||
990 | return 1; | |
991 | } | |
992 | ||
993 | /* Read the .dynamic section and extract the information of interest, | |
994 | which is stored in dld_cache. The routine elf_locate_base in solib.c | |
995 | was used as a model for this. */ | |
996 | ||
997 | static boolean | |
fba45db2 | 998 | read_dynamic_info (asection *dyninfo_sect, dld_cache_t *dld_cache_p) |
53a5351d JM |
999 | { |
1000 | char *buf; | |
1001 | char *bufend; | |
1002 | CORE_ADDR dyninfo_addr; | |
1003 | int dyninfo_sect_size; | |
1004 | CORE_ADDR entry_addr; | |
1005 | ||
1006 | /* Read in .dynamic section, silently ignore errors. */ | |
1007 | dyninfo_addr = bfd_section_vma (symfile_objfile->obfd, dyninfo_sect); | |
1008 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); | |
1009 | buf = alloca (dyninfo_sect_size); | |
1010 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
1011 | return 0; | |
1012 | ||
1013 | /* Scan the .dynamic section and record the items of interest. | |
1014 | In particular, DT_HP_DLD_FLAGS */ | |
1015 | for (bufend = buf + dyninfo_sect_size, entry_addr = dyninfo_addr; | |
1016 | buf < bufend; | |
1017 | buf += sizeof (Elf64_Dyn), entry_addr += sizeof (Elf64_Dyn)) | |
1018 | { | |
1019 | Elf64_Dyn *x_dynp = (Elf64_Dyn*)buf; | |
1020 | Elf64_Sxword dyn_tag; | |
1021 | CORE_ADDR dyn_ptr; | |
35fc8285 | 1022 | char *pbuf; |
53a5351d | 1023 | |
35fc8285 | 1024 | pbuf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT); |
53a5351d JM |
1025 | dyn_tag = bfd_h_get_64 (symfile_objfile->obfd, |
1026 | (bfd_byte*) &x_dynp->d_tag); | |
1027 | ||
1028 | /* We can't use a switch here because dyn_tag is 64 bits and HP's | |
1029 | lame comiler does not handle 64bit items in switch statements. */ | |
1030 | if (dyn_tag == DT_NULL) | |
1031 | break; | |
1032 | else if (dyn_tag == DT_HP_DLD_FLAGS) | |
1033 | { | |
1034 | /* Set dld_flags_addr and dld_flags in *dld_cache_p */ | |
1035 | dld_cache_p->dld_flags_addr = entry_addr + offsetof(Elf64_Dyn, d_un); | |
1036 | if (target_read_memory (dld_cache_p->dld_flags_addr, | |
1037 | (char*) &dld_cache_p->dld_flags, | |
1038 | sizeof(dld_cache_p->dld_flags)) | |
1039 | != 0) | |
1040 | { | |
1041 | error ("Error while reading in .dynamic section of the program."); | |
1042 | } | |
1043 | } | |
1044 | else if (dyn_tag == DT_HP_LOAD_MAP) | |
1045 | { | |
1046 | /* Dld will place the address of the load map at load_map_addr | |
1047 | after it starts running. */ | |
1048 | if (target_read_memory (entry_addr + offsetof(Elf64_Dyn, | |
1049 | d_un.d_ptr), | |
1050 | (char*) &dld_cache_p->load_map_addr, | |
1051 | sizeof(dld_cache_p->load_map_addr)) | |
1052 | != 0) | |
1053 | { | |
1054 | error ("Error while reading in .dynamic section of the program."); | |
1055 | } | |
1056 | } | |
1057 | else | |
1058 | { | |
1059 | /* tag is not of interest */ | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | /* Record other information and set is_valid to 1. */ | |
1064 | dld_cache_p->dyninfo_sect = dyninfo_sect; | |
1065 | ||
1066 | /* Verify that we read in required info. These fields are re-set to zero | |
1067 | in pa64_solib_restart. */ | |
1068 | ||
1069 | if (dld_cache_p->dld_flags_addr != 0 && dld_cache_p->load_map_addr != 0) | |
1070 | dld_cache_p->is_valid = 1; | |
1071 | else | |
1072 | return 0; | |
1073 | ||
1074 | return 1; | |
1075 | } | |
1076 | ||
1077 | /* Wrapper for target_read_memory to make dlgetmodinfo happy. */ | |
1078 | ||
1079 | static void * | |
fba45db2 | 1080 | pa64_target_read_memory (void *buffer, CORE_ADDR ptr, size_t bufsiz, int ident) |
53a5351d JM |
1081 | { |
1082 | if (target_read_memory (ptr, buffer, bufsiz) != 0) | |
1083 | return 0; | |
1084 | return buffer; | |
1085 | } | |
1086 | ||
1087 | /* Called from handle_dynlink_load_event and pa64_solib_add to add | |
1088 | a shared library to so_list_head list and possibly to read in the | |
1089 | debug information for the library. | |
1090 | ||
1091 | If load_module_desc_p is NULL, then the load module descriptor must | |
1092 | be read from the inferior process at the address load_module_desc_addr. */ | |
1093 | ||
1094 | static void | |
fba45db2 KB |
1095 | add_to_solist (boolean from_tty, char *dll_path, |
1096 | struct load_module_desc *load_module_desc_p, | |
1097 | CORE_ADDR load_module_desc_addr, struct target_ops *target) | |
53a5351d JM |
1098 | { |
1099 | struct so_list *new_so, *so_list_tail; | |
1100 | int pa64_solib_st_size_threshhold_exceeded; | |
1101 | LONGEST st_size; | |
1102 | ||
1103 | if (symfile_objfile == NULL) | |
1104 | return; | |
1105 | ||
1106 | so_list_tail = so_list_head; | |
1107 | /* Find the end of the list of shared objects. */ | |
1108 | while (so_list_tail && so_list_tail->next) | |
1109 | { | |
1110 | if (strcmp (so_list_tail->name, dll_path) == 0) | |
1111 | return; | |
1112 | so_list_tail = so_list_tail->next; | |
1113 | } | |
1114 | ||
1115 | if (so_list_tail && strcmp (so_list_tail->name, dll_path) == 0) | |
1116 | return; | |
1117 | ||
1118 | /* Add the shared library to the so_list_head list */ | |
1119 | new_so = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
1120 | memset ((char *)new_so, 0, sizeof (struct so_list)); | |
1121 | if (so_list_head == NULL) | |
1122 | { | |
1123 | so_list_head = new_so; | |
1124 | so_list_tail = new_so; | |
1125 | } | |
1126 | else | |
1127 | { | |
1128 | so_list_tail->next = new_so; | |
1129 | so_list_tail = new_so; | |
1130 | } | |
1131 | ||
1132 | /* Initialize the new_so */ | |
1133 | if (load_module_desc_p) | |
1134 | { | |
1135 | new_so->pa64_solib_desc = *load_module_desc_p; | |
1136 | } | |
1137 | else | |
1138 | { | |
1139 | if (target_read_memory (load_module_desc_addr, | |
1140 | (char*) &new_so->pa64_solib_desc, | |
1141 | sizeof(struct load_module_desc)) | |
1142 | != 0) | |
1143 | { | |
1144 | error ("Error while reading in dynamic library %s", dll_path); | |
1145 | } | |
1146 | } | |
1147 | ||
1148 | new_so->pa64_solib_desc_addr = load_module_desc_addr; | |
1149 | new_so->loaded = 1; | |
1150 | new_so->name = obsavestring (dll_path, strlen(dll_path), | |
1151 | &symfile_objfile->symbol_obstack); | |
1152 | ||
1153 | /* If we are not going to load the library, tell the user if we | |
1154 | haven't already and return. */ | |
1155 | ||
1156 | st_size = pa64_solib_sizeof_symbol_table (dll_path); | |
1157 | pa64_solib_st_size_threshhold_exceeded = | |
1158 | !from_tty | |
1159 | && ( (st_size + pa64_solib_total_st_size) | |
1160 | > (auto_solib_add * (LONGEST)1000000)); | |
1161 | if (pa64_solib_st_size_threshhold_exceeded) | |
1162 | { | |
1163 | pa64_solib_add_solib_objfile (new_so, dll_path, from_tty, 1); | |
1164 | return; | |
1165 | } | |
1166 | ||
1167 | /* Now read in debug info. */ | |
1168 | pa64_solib_total_st_size += st_size; | |
1169 | ||
1170 | /* This fills in new_so->objfile, among others. */ | |
1171 | pa64_solib_load_symbols (new_so, | |
1172 | dll_path, | |
1173 | from_tty, | |
b57d7d21 JL |
1174 | 0, |
1175 | target); | |
53a5351d JM |
1176 | return; |
1177 | } | |
1178 | ||
1179 | ||
1180 | /* | |
1181 | LOCAL FUNCTION | |
1182 | ||
1183 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
1184 | ||
1185 | SYNOPSIS | |
1186 | ||
1187 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) | |
1188 | ||
1189 | DESCRIPTION | |
1190 | ||
1191 | An expensive way to lookup the value of a single symbol for | |
1192 | bfd's that are only temporary anyway. This is used by the | |
1193 | shared library support to find the address of the debugger | |
1194 | interface structures in the shared library. | |
1195 | ||
1196 | Note that 0 is specifically allowed as an error return (no | |
1197 | such symbol). | |
1198 | */ | |
1199 | ||
1200 | static CORE_ADDR | |
fba45db2 | 1201 | bfd_lookup_symbol (bfd *abfd, char *symname) |
53a5351d JM |
1202 | { |
1203 | unsigned int storage_needed; | |
1204 | asymbol *sym; | |
1205 | asymbol **symbol_table; | |
1206 | unsigned int number_of_symbols; | |
1207 | unsigned int i; | |
1208 | struct cleanup *back_to; | |
1209 | CORE_ADDR symaddr = 0; | |
1210 | ||
1211 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
1212 | ||
1213 | if (storage_needed > 0) | |
1214 | { | |
1215 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
b8c9b27d | 1216 | back_to = make_cleanup (xfree, (PTR) symbol_table); |
53a5351d JM |
1217 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
1218 | ||
1219 | for (i = 0; i < number_of_symbols; i++) | |
1220 | { | |
1221 | sym = *symbol_table++; | |
1222 | if (STREQ (sym->name, symname)) | |
1223 | { | |
1224 | /* Bfd symbols are section relative. */ | |
1225 | symaddr = sym->value + sym->section->vma; | |
1226 | break; | |
1227 | } | |
1228 | } | |
1229 | do_cleanups (back_to); | |
1230 | } | |
1231 | return (symaddr); | |
1232 | } | |
1233 |