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419b8bfb RC |
1 | /* Handle SOM shared libraries for GDB, the GNU Debugger. |
2 | ||
3 | Copyright 2004 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "som.h" | |
24 | #include "symtab.h" | |
25 | #include "bfd.h" | |
26 | #include "symfile.h" | |
27 | #include "objfiles.h" | |
28 | #include "gdbcore.h" | |
29 | #include "target.h" | |
30 | #include "inferior.h" | |
31 | ||
32 | #include "hppa-tdep.h" | |
33 | #include "solist.h" | |
34 | ||
35 | #undef SOLIB_SOM_DBG | |
36 | ||
37 | /* These ought to be defined in some public interface, but aren't. They | |
38 | define the meaning of the various bits in the distinguished __dld_flags | |
39 | variable that is declared in every debuggable a.out on HP-UX, and that | |
40 | is shared between the debugger and the dynamic linker. | |
41 | */ | |
42 | #define DLD_FLAGS_MAPPRIVATE 0x1 | |
43 | #define DLD_FLAGS_HOOKVALID 0x2 | |
44 | #define DLD_FLAGS_LISTVALID 0x4 | |
45 | #define DLD_FLAGS_BOR_ENABLE 0x8 | |
46 | ||
47 | struct lm_info | |
48 | { | |
49 | /* Version of this structure (it is expected to change again in hpux10). */ | |
50 | unsigned char struct_version; | |
51 | ||
52 | /* Binding mode for this library. */ | |
53 | unsigned char bind_mode; | |
54 | ||
55 | /* Version of this library. */ | |
56 | short library_version; | |
57 | ||
58 | /* Start of text address, | |
59 | link-time text location (length of text area), | |
60 | end of text address. */ | |
61 | CORE_ADDR text_addr; | |
62 | CORE_ADDR text_link_addr; | |
63 | CORE_ADDR text_end; | |
64 | ||
65 | /* Start of data, start of bss and end of data. */ | |
66 | CORE_ADDR data_start; | |
67 | CORE_ADDR bss_start; | |
68 | CORE_ADDR data_end; | |
69 | ||
70 | /* Value of linkage pointer (%r19). */ | |
71 | CORE_ADDR got_value; | |
72 | ||
73 | /* Address in target of offset from thread-local register of | |
74 | start of this thread's data. I.e., the first thread-local | |
75 | variable in this shared library starts at *(tsd_start_addr) | |
76 | from that area pointed to by cr27 (mpsfu_hi). | |
77 | ||
78 | We do the indirection as soon as we read it, so from then | |
79 | on it's the offset itself. */ | |
80 | CORE_ADDR tsd_start_addr; | |
81 | ||
82 | /* Address of the link map entry in the loader. */ | |
83 | CORE_ADDR lm_addr; | |
84 | }; | |
85 | ||
86 | /* These addresses should be filled in by som_solib_create_inferior_hook. | |
87 | They are also used elsewhere in this module. | |
88 | */ | |
89 | typedef struct | |
90 | { | |
91 | CORE_ADDR address; | |
92 | struct unwind_table_entry *unwind; | |
93 | } | |
94 | addr_and_unwind_t; | |
95 | ||
96 | /* When adding fields, be sure to clear them in _initialize_som_solib. */ | |
97 | static struct | |
98 | { | |
99 | int is_valid; | |
100 | addr_and_unwind_t hook; | |
101 | addr_and_unwind_t hook_stub; | |
102 | addr_and_unwind_t load; | |
103 | addr_and_unwind_t load_stub; | |
104 | addr_and_unwind_t unload; | |
105 | addr_and_unwind_t unload2; | |
106 | addr_and_unwind_t unload_stub; | |
107 | } | |
108 | dld_cache; | |
109 | ||
110 | static void | |
111 | som_relocate_section_addresses (struct so_list *so, | |
112 | struct section_table *sec) | |
113 | { | |
114 | flagword aflag = bfd_get_section_flags(so->abfd, sec->the_bfd_section); | |
115 | ||
116 | /* solib.c does something similar, but it only recognizes ".text", SOM calls | |
117 | the text section "$CODE$". */ | |
118 | if (strcmp (sec->the_bfd_section->name, "$CODE$") == 0) | |
119 | { | |
120 | so->textsection = sec; | |
121 | } | |
122 | ||
123 | if (aflag & SEC_CODE) | |
124 | { | |
125 | sec->addr += so->lm_info->text_addr - so->lm_info->text_link_addr; | |
126 | sec->endaddr += so->lm_info->text_addr - so->lm_info->text_link_addr; | |
127 | } | |
128 | else if (aflag & SEC_DATA) | |
129 | { | |
130 | sec->addr += so->lm_info->data_start; | |
131 | sec->endaddr += so->lm_info->data_start; | |
132 | } | |
133 | else | |
134 | ; | |
135 | } | |
136 | ||
137 | /* This hook gets called just before the first instruction in the | |
138 | inferior process is executed. | |
139 | ||
140 | This is our opportunity to set magic flags in the inferior so | |
141 | that GDB can be notified when a shared library is mapped in and | |
142 | to tell the dynamic linker that a private copy of the library is | |
143 | needed (so GDB can set breakpoints in the library). | |
144 | ||
145 | __dld_flags is the location of the magic flags; as of this implementation | |
146 | there are 3 flags of interest: | |
147 | ||
148 | bit 0 when set indicates that private copies of the libraries are needed | |
149 | bit 1 when set indicates that the callback hook routine is valid | |
150 | bit 2 when set indicates that the dynamic linker should maintain the | |
151 | __dld_list structure when loading/unloading libraries. | |
152 | ||
153 | Note that shared libraries are not mapped in at this time, so we have | |
154 | run the inferior until the libraries are mapped in. Typically this | |
155 | means running until the "_start" is called. */ | |
156 | ||
157 | static void | |
158 | som_solib_create_inferior_hook (void) | |
159 | { | |
160 | struct minimal_symbol *msymbol; | |
161 | unsigned int dld_flags, status, have_endo; | |
162 | asection *shlib_info; | |
163 | char buf[4]; | |
419b8bfb RC |
164 | CORE_ADDR anaddr; |
165 | ||
166 | /* First, remove all the solib event breakpoints. Their addresses | |
167 | may have changed since the last time we ran the program. */ | |
168 | remove_solib_event_breakpoints (); | |
169 | ||
170 | if (symfile_objfile == NULL) | |
171 | return; | |
172 | ||
173 | /* First see if the objfile was dynamically linked. */ | |
174 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); | |
175 | if (!shlib_info) | |
176 | return; | |
177 | ||
178 | /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */ | |
179 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) | |
180 | return; | |
181 | ||
182 | have_endo = 0; | |
183 | /* Slam the pid of the process into __d_pid. | |
184 | ||
185 | We used to warn when this failed, but that warning is only useful | |
186 | on very old HP systems (hpux9 and older). The warnings are an | |
187 | annoyance to users of modern systems and foul up the testsuite as | |
188 | well. As a result, the warnings have been disabled. */ | |
189 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); | |
190 | if (msymbol == NULL) | |
191 | goto keep_going; | |
192 | ||
193 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
194 | store_unsigned_integer (buf, 4, PIDGET (inferior_ptid)); | |
195 | status = target_write_memory (anaddr, buf, 4); | |
196 | if (status != 0) | |
197 | { | |
198 | warning ("Unable to write __d_pid"); | |
199 | warning ("Suggest linking with /opt/langtools/lib/end.o."); | |
200 | warning ("GDB will be unable to track shl_load/shl_unload calls"); | |
201 | goto keep_going; | |
202 | } | |
203 | ||
204 | /* Get the value of _DLD_HOOK (an export stub) and put it in __dld_hook; | |
205 | This will force the dynamic linker to call __d_trap when significant | |
206 | events occur. | |
207 | ||
208 | Note that the above is the pre-HP-UX 9.0 behaviour. At 9.0 and above, | |
209 | the dld provides an export stub named "__d_trap" as well as the | |
210 | function named "__d_trap" itself, but doesn't provide "_DLD_HOOK". | |
211 | We'll look first for the old flavor and then the new. | |
212 | */ | |
213 | msymbol = lookup_minimal_symbol ("_DLD_HOOK", NULL, symfile_objfile); | |
214 | if (msymbol == NULL) | |
215 | msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile); | |
216 | if (msymbol == NULL) | |
217 | { | |
218 | warning ("Unable to find _DLD_HOOK symbol in object file."); | |
219 | warning ("Suggest linking with /opt/langtools/lib/end.o."); | |
220 | warning ("GDB will be unable to track shl_load/shl_unload calls"); | |
221 | goto keep_going; | |
222 | } | |
223 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
224 | dld_cache.hook.address = anaddr; | |
225 | ||
226 | /* Grrr, this might not be an export symbol! We have to find the | |
227 | export stub. */ | |
ff644745 JB |
228 | msymbol = hppa_lookup_stub_minimal_symbol (SYMBOL_LINKAGE_NAME (msymbol), |
229 | EXPORT); | |
230 | if (msymbol != NULL) | |
231 | { | |
232 | anaddr = SYMBOL_VALUE (msymbol); | |
233 | dld_cache.hook_stub.address = anaddr; | |
234 | } | |
419b8bfb RC |
235 | store_unsigned_integer (buf, 4, anaddr); |
236 | ||
237 | msymbol = lookup_minimal_symbol ("__dld_hook", NULL, symfile_objfile); | |
238 | if (msymbol == NULL) | |
239 | { | |
240 | warning ("Unable to find __dld_hook symbol in object file."); | |
241 | warning ("Suggest linking with /opt/langtools/lib/end.o."); | |
242 | warning ("GDB will be unable to track shl_load/shl_unload calls"); | |
243 | goto keep_going; | |
244 | } | |
245 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
246 | status = target_write_memory (anaddr, buf, 4); | |
247 | ||
248 | /* Now set a shlib_event breakpoint at __d_trap so we can track | |
249 | significant shared library events. */ | |
250 | msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile); | |
251 | if (msymbol == NULL) | |
252 | { | |
253 | warning ("Unable to find __dld_d_trap symbol in object file."); | |
254 | warning ("Suggest linking with /opt/langtools/lib/end.o."); | |
255 | warning ("GDB will be unable to track shl_load/shl_unload calls"); | |
256 | goto keep_going; | |
257 | } | |
258 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); | |
259 | ||
260 | /* We have all the support usually found in end.o, so we can track | |
261 | shl_load and shl_unload calls. */ | |
262 | have_endo = 1; | |
263 | ||
264 | keep_going: | |
265 | ||
266 | /* Get the address of __dld_flags, if no such symbol exists, then we can | |
267 | not debug the shared code. */ | |
268 | msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL); | |
269 | if (msymbol == NULL) | |
270 | { | |
271 | error ("Unable to find __dld_flags symbol in object file.\n"); | |
272 | } | |
273 | ||
274 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
275 | ||
276 | /* Read the current contents. */ | |
277 | status = target_read_memory (anaddr, buf, 4); | |
278 | if (status != 0) | |
279 | { | |
280 | error ("Unable to read __dld_flags\n"); | |
281 | } | |
282 | dld_flags = extract_unsigned_integer (buf, 4); | |
283 | ||
284 | /* Turn on the flags we care about. */ | |
285 | dld_flags |= DLD_FLAGS_MAPPRIVATE; | |
286 | if (have_endo) | |
287 | dld_flags |= DLD_FLAGS_HOOKVALID; | |
288 | store_unsigned_integer (buf, 4, dld_flags); | |
289 | status = target_write_memory (anaddr, buf, 4); | |
290 | if (status != 0) | |
291 | { | |
292 | error ("Unable to write __dld_flags\n"); | |
293 | } | |
294 | ||
295 | /* Now find the address of _start and set a breakpoint there. | |
296 | We still need this code for two reasons: | |
297 | ||
298 | * Not all sites have /opt/langtools/lib/end.o, so it's not always | |
299 | possible to track the dynamic linker's events. | |
300 | ||
301 | * At this time no events are triggered for shared libraries | |
302 | loaded at startup time (what a crock). */ | |
303 | ||
304 | msymbol = lookup_minimal_symbol ("_start", NULL, symfile_objfile); | |
305 | if (msymbol == NULL) | |
306 | { | |
307 | error ("Unable to find _start symbol in object file.\n"); | |
308 | } | |
309 | ||
310 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
311 | ||
312 | /* Make the breakpoint at "_start" a shared library event breakpoint. */ | |
313 | create_solib_event_breakpoint (anaddr); | |
314 | ||
315 | clear_symtab_users (); | |
316 | } | |
317 | ||
318 | /* This operation removes the "hook" between GDB and the dynamic linker, | |
319 | which causes the dld to notify GDB of shared library events. | |
320 | ||
321 | After this operation completes, the dld will no longer notify GDB of | |
322 | shared library events. To resume notifications, GDB must call | |
323 | som_solib_create_inferior_hook. | |
324 | ||
325 | This operation does not remove any knowledge of shared libraries which | |
326 | GDB may already have been notified of. | |
327 | */ | |
328 | static void | |
329 | som_solib_remove_inferior_hook (int pid) | |
330 | { | |
331 | CORE_ADDR addr; | |
332 | struct minimal_symbol *msymbol; | |
333 | int status; | |
334 | char dld_flags_buffer[4]; | |
335 | unsigned int dld_flags_value; | |
336 | struct cleanup *old_cleanups = save_inferior_ptid (); | |
337 | ||
338 | /* Ensure that we're really operating on the specified process. */ | |
339 | inferior_ptid = pid_to_ptid (pid); | |
340 | ||
341 | /* We won't bother to remove the solib breakpoints from this process. | |
342 | ||
343 | In fact, on PA64 the breakpoint is hard-coded into the dld callback, | |
344 | and thus we're not supposed to remove it. | |
345 | ||
346 | Rather, we'll merely clear the dld_flags bit that enables callbacks. | |
347 | */ | |
348 | msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL); | |
349 | ||
350 | addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
351 | status = target_read_memory (addr, dld_flags_buffer, 4); | |
352 | ||
353 | dld_flags_value = extract_unsigned_integer (dld_flags_buffer, 4); | |
354 | ||
355 | dld_flags_value &= ~DLD_FLAGS_HOOKVALID; | |
356 | store_unsigned_integer (dld_flags_buffer, 4, dld_flags_value); | |
357 | status = target_write_memory (addr, dld_flags_buffer, 4); | |
358 | ||
359 | do_cleanups (old_cleanups); | |
360 | } | |
361 | ||
362 | static void | |
363 | som_special_symbol_handling (void) | |
364 | { | |
365 | } | |
366 | ||
367 | static void | |
368 | som_solib_desire_dynamic_linker_symbols (void) | |
369 | { | |
370 | struct objfile *objfile; | |
371 | struct unwind_table_entry *u; | |
372 | struct minimal_symbol *dld_msymbol; | |
373 | ||
374 | /* Do we already know the value of these symbols? If so, then | |
375 | we've no work to do. | |
376 | ||
377 | (If you add clauses to this test, be sure to likewise update the | |
378 | test within the loop.) | |
379 | */ | |
380 | if (dld_cache.is_valid) | |
381 | return; | |
382 | ||
383 | ALL_OBJFILES (objfile) | |
384 | { | |
385 | dld_msymbol = lookup_minimal_symbol ("shl_load", NULL, objfile); | |
386 | if (dld_msymbol != NULL) | |
387 | { | |
388 | dld_cache.load.address = SYMBOL_VALUE (dld_msymbol); | |
389 | dld_cache.load.unwind = find_unwind_entry (dld_cache.load.address); | |
390 | } | |
391 | ||
392 | dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_load", | |
393 | objfile); | |
394 | if (dld_msymbol != NULL) | |
395 | { | |
396 | if (SYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline) | |
397 | { | |
398 | u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol)); | |
399 | if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT)) | |
400 | { | |
401 | dld_cache.load_stub.address = SYMBOL_VALUE (dld_msymbol); | |
402 | dld_cache.load_stub.unwind = u; | |
403 | } | |
404 | } | |
405 | } | |
406 | ||
407 | dld_msymbol = lookup_minimal_symbol ("shl_unload", NULL, objfile); | |
408 | if (dld_msymbol != NULL) | |
409 | { | |
410 | dld_cache.unload.address = SYMBOL_VALUE (dld_msymbol); | |
411 | dld_cache.unload.unwind = find_unwind_entry (dld_cache.unload.address); | |
412 | ||
413 | /* ??rehrauer: I'm not sure exactly what this is, but it appears | |
414 | that on some HPUX 10.x versions, there's two unwind regions to | |
415 | cover the body of "shl_unload", the second being 4 bytes past | |
416 | the end of the first. This is a large hack to handle that | |
417 | case, but since I don't seem to have any legitimate way to | |
418 | look for this thing via the symbol table... | |
419 | */ | |
420 | if (dld_cache.unload.unwind != NULL) | |
421 | { | |
422 | u = find_unwind_entry (dld_cache.unload.unwind->region_end + 4); | |
423 | if (u != NULL) | |
424 | { | |
425 | dld_cache.unload2.address = u->region_start; | |
426 | dld_cache.unload2.unwind = u; | |
427 | } | |
428 | } | |
429 | } | |
430 | ||
431 | dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_unload", | |
432 | objfile); | |
433 | if (dld_msymbol != NULL) | |
434 | { | |
435 | if (SYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline) | |
436 | { | |
437 | u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol)); | |
438 | if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT)) | |
439 | { | |
440 | dld_cache.unload_stub.address = SYMBOL_VALUE (dld_msymbol); | |
441 | dld_cache.unload_stub.unwind = u; | |
442 | } | |
443 | } | |
444 | } | |
445 | ||
446 | /* Did we find everything we were looking for? If so, stop. */ | |
447 | if ((dld_cache.load.address != 0) | |
448 | && (dld_cache.load_stub.address != 0) | |
449 | && (dld_cache.unload.address != 0) | |
450 | && (dld_cache.unload_stub.address != 0)) | |
451 | { | |
452 | dld_cache.is_valid = 1; | |
453 | break; | |
454 | } | |
455 | } | |
456 | ||
457 | dld_cache.hook.unwind = find_unwind_entry (dld_cache.hook.address); | |
458 | dld_cache.hook_stub.unwind = find_unwind_entry (dld_cache.hook_stub.address); | |
459 | ||
460 | /* We're prepared not to find some of these symbols, which is why | |
461 | this function is a "desire" operation, and not a "require". | |
462 | */ | |
463 | } | |
464 | ||
465 | static int | |
466 | som_in_dynsym_resolve_code (CORE_ADDR pc) | |
467 | { | |
468 | struct unwind_table_entry *u_pc; | |
469 | ||
470 | /* Are we in the dld itself? | |
471 | ||
472 | ??rehrauer: Large hack -- We'll assume that any address in a | |
473 | shared text region is the dld's text. This would obviously | |
474 | fall down if the user attached to a process, whose shlibs | |
475 | weren't mapped to a (writeable) private region. However, in | |
476 | that case the debugger probably isn't able to set the fundamental | |
477 | breakpoint in the dld callback anyways, so this hack should be | |
478 | safe. | |
479 | */ | |
480 | if ((pc & (CORE_ADDR) 0xc0000000) == (CORE_ADDR) 0xc0000000) | |
481 | return 1; | |
482 | ||
483 | /* Cache the address of some symbols that are part of the dynamic | |
484 | linker, if not already known. | |
485 | */ | |
486 | som_solib_desire_dynamic_linker_symbols (); | |
487 | ||
488 | /* Are we in the dld callback? Or its export stub? */ | |
489 | u_pc = find_unwind_entry (pc); | |
490 | if (u_pc == NULL) | |
491 | return 0; | |
492 | ||
493 | if ((u_pc == dld_cache.hook.unwind) || (u_pc == dld_cache.hook_stub.unwind)) | |
494 | return 1; | |
495 | ||
496 | /* Or the interface of the dld (i.e., "shl_load" or friends)? */ | |
497 | if ((u_pc == dld_cache.load.unwind) | |
498 | || (u_pc == dld_cache.unload.unwind) | |
499 | || (u_pc == dld_cache.unload2.unwind) | |
500 | || (u_pc == dld_cache.load_stub.unwind) | |
501 | || (u_pc == dld_cache.unload_stub.unwind)) | |
502 | return 1; | |
503 | ||
504 | /* Apparently this address isn't part of the dld's text. */ | |
505 | return 0; | |
506 | } | |
507 | ||
508 | static void | |
509 | som_clear_solib (void) | |
510 | { | |
511 | } | |
512 | ||
513 | struct dld_list { | |
514 | char name[4]; | |
515 | char info[4]; | |
516 | char text_addr[4]; | |
517 | char text_link_addr[4]; | |
518 | char text_end[4]; | |
519 | char data_start[4]; | |
520 | char bss_start[4]; | |
521 | char data_end[4]; | |
522 | char got_value[4]; | |
523 | char next[4]; | |
524 | char tsd_start_addr_ptr[4]; | |
525 | }; | |
526 | ||
527 | static CORE_ADDR | |
528 | link_map_start (void) | |
529 | { | |
530 | struct minimal_symbol *sym; | |
531 | CORE_ADDR addr; | |
532 | char buf[4]; | |
533 | unsigned int dld_flags; | |
534 | ||
535 | sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL); | |
536 | if (!sym) | |
537 | { | |
538 | error ("Unable to find __dld_flags symbol in object file.\n"); | |
539 | return 0; | |
540 | } | |
541 | addr = SYMBOL_VALUE_ADDRESS (sym); | |
542 | read_memory (addr, buf, 4); | |
543 | dld_flags = extract_unsigned_integer (buf, 4); | |
544 | if ((dld_flags & DLD_FLAGS_LISTVALID) == 0) | |
545 | { | |
546 | error ("__dld_list is not valid according to __dld_flags.\n"); | |
547 | return 0; | |
548 | } | |
549 | ||
550 | /* If the libraries were not mapped private, warn the user. */ | |
551 | if ((dld_flags & DLD_FLAGS_MAPPRIVATE) == 0) | |
552 | warning ("The shared libraries were not privately mapped; setting a\n" | |
553 | "breakpoint in a shared library will not work until you rerun the " | |
554 | "program.\n"); | |
555 | ||
556 | sym = lookup_minimal_symbol ("__dld_list", NULL, NULL); | |
557 | if (!sym) | |
558 | { | |
559 | /* Older crt0.o files (hpux8) don't have __dld_list as a symbol, | |
560 | but the data is still available if you know where to look. */ | |
561 | sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL); | |
562 | if (!sym) | |
563 | { | |
564 | error ("Unable to find dynamic library list.\n"); | |
565 | return 0; | |
566 | } | |
567 | addr = SYMBOL_VALUE_ADDRESS (sym) - 8; | |
568 | } | |
569 | else | |
570 | addr = SYMBOL_VALUE_ADDRESS (sym); | |
571 | ||
572 | read_memory (addr, buf, 4); | |
573 | addr = extract_unsigned_integer (buf, 4); | |
574 | if (addr == 0) | |
575 | { | |
576 | error ("Debugging dynamic executables loaded via the hpux8 dld.sl is not supported.\n"); | |
577 | return 0; | |
578 | } | |
579 | ||
580 | read_memory (addr, buf, 4); | |
581 | return extract_unsigned_integer (buf, 4); | |
582 | } | |
583 | ||
584 | /* Does this so's name match the main binary? */ | |
585 | static int | |
586 | match_main (const char *name) | |
587 | { | |
588 | return strcmp (name, symfile_objfile->name) == 0; | |
589 | } | |
590 | ||
591 | static struct so_list * | |
592 | som_current_sos (void) | |
593 | { | |
594 | CORE_ADDR lm; | |
595 | struct so_list *head = 0; | |
596 | struct so_list **link_ptr = &head; | |
597 | ||
598 | for (lm = link_map_start (); lm; ) | |
599 | { | |
600 | char *namebuf; | |
601 | CORE_ADDR addr; | |
602 | struct so_list *new; | |
603 | struct cleanup *old_chain; | |
604 | int errcode; | |
605 | struct dld_list dbuf; | |
606 | char tsdbuf[4]; | |
607 | ||
608 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
609 | old_chain = make_cleanup (xfree, new); | |
610 | ||
611 | memset (new, 0, sizeof (*new)); | |
612 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
613 | make_cleanup (xfree, new->lm_info); | |
614 | ||
615 | read_memory (lm, (char *)&dbuf, sizeof (struct dld_list)); | |
616 | ||
617 | addr = extract_unsigned_integer (&dbuf.name, sizeof (dbuf.name)); | |
618 | target_read_string (addr, &namebuf, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
619 | if (errcode != 0) | |
620 | { | |
621 | warning ("current_sos: Can't read pathname for load map: %s\n", | |
622 | safe_strerror (errcode)); | |
623 | } | |
624 | else | |
625 | { | |
626 | strncpy (new->so_name, namebuf, SO_NAME_MAX_PATH_SIZE - 1); | |
627 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
628 | xfree (namebuf); | |
629 | strcpy (new->so_original_name, new->so_name); | |
630 | } | |
631 | ||
632 | if (new->so_name[0] && !match_main (new->so_name)) | |
633 | { | |
634 | struct lm_info *lmi = new->lm_info; | |
635 | unsigned int tmp; | |
636 | ||
637 | lmi->lm_addr = lm; | |
638 | ||
639 | #define EXTRACT(_fld) \ | |
640 | extract_unsigned_integer (&dbuf._fld, sizeof (dbuf._fld)); | |
641 | ||
642 | lmi->text_addr = EXTRACT (text_addr); | |
643 | tmp = EXTRACT (info); | |
644 | lmi->library_version = (tmp >> 16) & 0xffff; | |
645 | lmi->bind_mode = (tmp >> 8) & 0xff; | |
646 | lmi->struct_version = tmp & 0xff; | |
647 | lmi->text_link_addr = EXTRACT (text_link_addr); | |
648 | lmi->text_end = EXTRACT (text_end); | |
649 | lmi->data_start = EXTRACT (data_start); | |
650 | lmi->bss_start = EXTRACT (bss_start); | |
651 | lmi->data_end = EXTRACT (data_end); | |
652 | lmi->got_value = EXTRACT (got_value); | |
653 | tmp = EXTRACT (tsd_start_addr_ptr); | |
654 | read_memory (tmp, tsdbuf, 4); | |
655 | lmi->tsd_start_addr = extract_unsigned_integer (tsdbuf, 4); | |
656 | ||
657 | #ifdef SOLIB_SOM_DBG | |
658 | printf ("\n+ library \"%s\" is described at 0x%s\n", new->so_name, | |
659 | paddr_nz (lm)); | |
660 | printf (" 'version' is %d\n", new->lm_info->struct_version); | |
661 | printf (" 'bind_mode' is %d\n", new->lm_info->bind_mode); | |
662 | printf (" 'library_version' is %d\n", | |
663 | new->lm_info->library_version); | |
664 | printf (" 'text_addr' is 0x%s\n", | |
665 | paddr_nz (new->lm_info->text_addr)); | |
666 | printf (" 'text_link_addr' is 0x%s\n", | |
667 | paddr_nz (new->lm_info->text_link_addr)); | |
668 | printf (" 'text_end' is 0x%s\n", | |
669 | paddr_nz (new->lm_info->text_end)); | |
670 | printf (" 'data_start' is 0x%s\n", | |
671 | paddr_nz (new->lm_info->data_start)); | |
672 | printf (" 'bss_start' is 0x%s\n", | |
673 | paddr_nz (new->lm_info->bss_start)); | |
674 | printf (" 'data_end' is 0x%s\n", | |
675 | paddr_nz (new->lm_info->data_end)); | |
676 | printf (" 'got_value' is %s\n", | |
677 | paddr_nz (new->lm_info->got_value)); | |
678 | printf (" 'tsd_start_addr' is 0x%s\n", | |
679 | paddr_nz (new->lm_info->tsd_start_addr)); | |
680 | #endif | |
681 | ||
682 | /* Link the new object onto the list. */ | |
683 | new->next = NULL; | |
684 | *link_ptr = new; | |
685 | link_ptr = &new->next; | |
686 | } | |
687 | else | |
688 | { | |
689 | free_so (new); | |
690 | } | |
691 | ||
692 | lm = EXTRACT (next); | |
693 | discard_cleanups (old_chain); | |
694 | #undef EXTRACT | |
695 | } | |
696 | ||
697 | /* TODO: The original somsolib code has logic to detect and eliminate | |
698 | duplicate entries. Do we need that? */ | |
699 | ||
700 | return head; | |
701 | } | |
702 | ||
703 | static int | |
704 | som_open_symbol_file_object (void *from_ttyp) | |
705 | { | |
706 | CORE_ADDR lm, l_name; | |
707 | char *filename; | |
708 | int errcode; | |
709 | int from_tty = *(int *)from_ttyp; | |
710 | char buf[4]; | |
711 | ||
712 | if (symfile_objfile) | |
713 | if (!query ("Attempt to reload symbols from process? ")) | |
714 | return 0; | |
715 | ||
716 | /* First link map member should be the executable. */ | |
717 | if ((lm = link_map_start ()) == 0) | |
718 | return 0; /* failed somehow... */ | |
719 | ||
720 | /* Read address of name from target memory to GDB. */ | |
721 | read_memory (lm + offsetof (struct dld_list, name), buf, 4); | |
722 | ||
723 | /* Convert the address to host format. Assume that the address is | |
724 | unsigned. */ | |
725 | l_name = extract_unsigned_integer (buf, 4); | |
726 | ||
727 | if (l_name == 0) | |
728 | return 0; /* No filename. */ | |
729 | ||
730 | /* Now fetch the filename from target memory. */ | |
731 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
732 | ||
733 | if (errcode) | |
734 | { | |
735 | warning ("failed to read exec filename from attached file: %s", | |
736 | safe_strerror (errcode)); | |
737 | return 0; | |
738 | } | |
739 | ||
740 | make_cleanup (xfree, filename); | |
741 | /* Have a pathname: read the symbol file. */ | |
742 | symbol_file_add_main (filename, from_tty); | |
743 | ||
744 | return 1; | |
745 | } | |
746 | ||
747 | static void | |
748 | som_free_so (struct so_list *so) | |
749 | { | |
750 | xfree (so->lm_info); | |
751 | } | |
752 | ||
753 | static CORE_ADDR | |
754 | som_solib_thread_start_addr (struct so_list *so) | |
755 | { | |
756 | return so->lm_info->tsd_start_addr; | |
757 | } | |
758 | ||
759 | /* Return the GOT value for the shared library in which ADDR belongs. If | |
760 | ADDR isn't in any known shared library, return zero. */ | |
761 | ||
762 | static CORE_ADDR | |
763 | som_solib_get_got_by_pc (CORE_ADDR addr) | |
764 | { | |
765 | struct so_list *so_list = master_so_list (); | |
766 | CORE_ADDR got_value = 0; | |
767 | ||
768 | while (so_list) | |
769 | { | |
770 | if (so_list->lm_info->text_addr <= addr | |
771 | && so_list->lm_info->text_end > addr) | |
772 | { | |
773 | got_value = so_list->lm_info->got_value; | |
774 | break; | |
775 | } | |
776 | so_list = so_list->next; | |
777 | } | |
778 | return got_value; | |
779 | } | |
780 | ||
781 | /* Return the address of the handle of the shared library in which ADDR belongs. | |
782 | If ADDR isn't in any known shared library, return zero. */ | |
783 | /* this function is used in initialize_hp_cxx_exception_support in | |
784 | hppa-hpux-tdep.c */ | |
785 | ||
786 | static CORE_ADDR | |
787 | som_solib_get_solib_by_pc (CORE_ADDR addr) | |
788 | { | |
789 | struct so_list *so_list = master_so_list (); | |
790 | ||
791 | while (so_list) | |
792 | { | |
793 | if (so_list->lm_info->text_addr <= addr | |
794 | && so_list->lm_info->text_end > addr) | |
795 | { | |
796 | break; | |
797 | } | |
798 | so_list = so_list->next; | |
799 | } | |
800 | if (so_list) | |
801 | return so_list->lm_info->lm_addr; | |
802 | else | |
803 | return 0; | |
804 | } | |
805 | ||
806 | ||
807 | static struct target_so_ops som_so_ops; | |
808 | ||
809 | extern initialize_file_ftype _initialize_som_solib; /* -Wmissing-prototypes */ | |
810 | ||
811 | void | |
812 | _initialize_som_solib (void) | |
813 | { | |
814 | som_so_ops.relocate_section_addresses = som_relocate_section_addresses; | |
815 | som_so_ops.free_so = som_free_so; | |
816 | som_so_ops.clear_solib = som_clear_solib; | |
817 | som_so_ops.solib_create_inferior_hook = som_solib_create_inferior_hook; | |
818 | som_so_ops.special_symbol_handling = som_special_symbol_handling; | |
819 | som_so_ops.current_sos = som_current_sos; | |
820 | som_so_ops.open_symbol_file_object = som_open_symbol_file_object; | |
821 | som_so_ops.in_dynsym_resolve_code = som_in_dynsym_resolve_code; | |
822 | } | |
823 | ||
824 | void som_solib_select (struct gdbarch_tdep *tdep) | |
825 | { | |
826 | current_target_so_ops = &som_so_ops; | |
827 | ||
828 | tdep->solib_thread_start_addr = som_solib_thread_start_addr; | |
829 | tdep->solib_get_got_by_pc = som_solib_get_got_by_pc; | |
830 | tdep->solib_get_solib_by_pc = som_solib_get_solib_by_pc; | |
831 | } | |
832 | ||
833 | /* The rest of these functions are not part of the solib interface; they | |
834 | are used by somread.c or hppa-hpux-tdep.c */ | |
835 | ||
836 | int | |
837 | som_solib_section_offsets (struct objfile *objfile, | |
838 | struct section_offsets *offsets) | |
839 | { | |
840 | struct so_list *so_list = master_so_list (); | |
841 | ||
842 | while (so_list) | |
843 | { | |
844 | /* Oh what a pain! We need the offsets before so_list->objfile | |
845 | is valid. The BFDs will never match. Make a best guess. */ | |
846 | if (strstr (objfile->name, so_list->so_name)) | |
847 | { | |
848 | asection *private_section; | |
849 | ||
850 | /* The text offset is easy. */ | |
851 | offsets->offsets[SECT_OFF_TEXT (objfile)] | |
852 | = (so_list->lm_info->text_addr | |
853 | - so_list->lm_info->text_link_addr); | |
854 | offsets->offsets[SECT_OFF_RODATA (objfile)] | |
855 | = ANOFFSET (offsets, SECT_OFF_TEXT (objfile)); | |
856 | ||
857 | /* We should look at presumed_dp in the SOM header, but | |
858 | that's not easily available. This should be OK though. */ | |
859 | private_section = bfd_get_section_by_name (objfile->obfd, | |
860 | "$PRIVATE$"); | |
861 | if (!private_section) | |
862 | { | |
863 | warning ("Unable to find $PRIVATE$ in shared library!"); | |
864 | offsets->offsets[SECT_OFF_DATA (objfile)] = 0; | |
865 | offsets->offsets[SECT_OFF_BSS (objfile)] = 0; | |
866 | return 1; | |
867 | } | |
868 | offsets->offsets[SECT_OFF_DATA (objfile)] | |
869 | = (so_list->lm_info->data_start - private_section->vma); | |
870 | offsets->offsets[SECT_OFF_BSS (objfile)] | |
871 | = ANOFFSET (offsets, SECT_OFF_DATA (objfile)); | |
872 | return 1; | |
873 | } | |
874 | so_list = so_list->next; | |
875 | } | |
876 | return 0; | |
877 | } |