Commit | Line | Data |
---|---|---|
fbdbf38b | 1 | /* Handle SOM shared libraries. |
419b8bfb | 2 | |
0fb0cc75 | 3 | Copyright (C) 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc. |
419b8bfb RC |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
419b8bfb RC |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
419b8bfb RC |
19 | |
20 | #include "defs.h" | |
419b8bfb RC |
21 | #include "symtab.h" |
22 | #include "bfd.h" | |
23 | #include "symfile.h" | |
24 | #include "objfiles.h" | |
25 | #include "gdbcore.h" | |
26 | #include "target.h" | |
27 | #include "inferior.h" | |
28 | ||
29 | #include "hppa-tdep.h" | |
30 | #include "solist.h" | |
d542061a | 31 | #include "solib.h" |
63807e1d | 32 | #include "solib-som.h" |
419b8bfb | 33 | |
7be67755 DA |
34 | #include <sys/utsname.h> |
35 | #include <string.h> | |
36 | ||
419b8bfb RC |
37 | #undef SOLIB_SOM_DBG |
38 | ||
39 | /* These ought to be defined in some public interface, but aren't. They | |
40 | define the meaning of the various bits in the distinguished __dld_flags | |
41 | variable that is declared in every debuggable a.out on HP-UX, and that | |
42 | is shared between the debugger and the dynamic linker. | |
43 | */ | |
44 | #define DLD_FLAGS_MAPPRIVATE 0x1 | |
45 | #define DLD_FLAGS_HOOKVALID 0x2 | |
46 | #define DLD_FLAGS_LISTVALID 0x4 | |
47 | #define DLD_FLAGS_BOR_ENABLE 0x8 | |
48 | ||
49 | struct lm_info | |
50 | { | |
51 | /* Version of this structure (it is expected to change again in hpux10). */ | |
52 | unsigned char struct_version; | |
53 | ||
54 | /* Binding mode for this library. */ | |
55 | unsigned char bind_mode; | |
56 | ||
57 | /* Version of this library. */ | |
58 | short library_version; | |
59 | ||
60 | /* Start of text address, | |
61 | link-time text location (length of text area), | |
62 | end of text address. */ | |
63 | CORE_ADDR text_addr; | |
64 | CORE_ADDR text_link_addr; | |
65 | CORE_ADDR text_end; | |
66 | ||
67 | /* Start of data, start of bss and end of data. */ | |
68 | CORE_ADDR data_start; | |
69 | CORE_ADDR bss_start; | |
70 | CORE_ADDR data_end; | |
71 | ||
72 | /* Value of linkage pointer (%r19). */ | |
73 | CORE_ADDR got_value; | |
74 | ||
75 | /* Address in target of offset from thread-local register of | |
76 | start of this thread's data. I.e., the first thread-local | |
77 | variable in this shared library starts at *(tsd_start_addr) | |
78 | from that area pointed to by cr27 (mpsfu_hi). | |
79 | ||
80 | We do the indirection as soon as we read it, so from then | |
81 | on it's the offset itself. */ | |
82 | CORE_ADDR tsd_start_addr; | |
83 | ||
84 | /* Address of the link map entry in the loader. */ | |
85 | CORE_ADDR lm_addr; | |
86 | }; | |
87 | ||
88 | /* These addresses should be filled in by som_solib_create_inferior_hook. | |
89 | They are also used elsewhere in this module. | |
90 | */ | |
91 | typedef struct | |
92 | { | |
93 | CORE_ADDR address; | |
94 | struct unwind_table_entry *unwind; | |
95 | } | |
96 | addr_and_unwind_t; | |
97 | ||
98 | /* When adding fields, be sure to clear them in _initialize_som_solib. */ | |
99 | static struct | |
100 | { | |
101 | int is_valid; | |
102 | addr_and_unwind_t hook; | |
103 | addr_and_unwind_t hook_stub; | |
104 | addr_and_unwind_t load; | |
105 | addr_and_unwind_t load_stub; | |
106 | addr_and_unwind_t unload; | |
107 | addr_and_unwind_t unload2; | |
108 | addr_and_unwind_t unload_stub; | |
109 | } | |
110 | dld_cache; | |
111 | ||
112 | static void | |
113 | som_relocate_section_addresses (struct so_list *so, | |
0542c86d | 114 | struct target_section *sec) |
419b8bfb RC |
115 | { |
116 | flagword aflag = bfd_get_section_flags(so->abfd, sec->the_bfd_section); | |
117 | ||
419b8bfb RC |
118 | if (aflag & SEC_CODE) |
119 | { | |
120 | sec->addr += so->lm_info->text_addr - so->lm_info->text_link_addr; | |
121 | sec->endaddr += so->lm_info->text_addr - so->lm_info->text_link_addr; | |
122 | } | |
123 | else if (aflag & SEC_DATA) | |
124 | { | |
125 | sec->addr += so->lm_info->data_start; | |
126 | sec->endaddr += so->lm_info->data_start; | |
127 | } | |
128 | else | |
129 | ; | |
130 | } | |
131 | ||
7be67755 DA |
132 | /* Get HP-UX major release number. Returns zero if the |
133 | release is not known. */ | |
134 | ||
135 | static int | |
136 | get_hpux_major_release (void) | |
137 | { | |
138 | static int hpux_major_release = -1; | |
139 | ||
140 | if (hpux_major_release == -1) | |
141 | { | |
142 | struct utsname x; | |
143 | char *p; | |
144 | ||
145 | uname (&x); | |
146 | p = strchr (x.release, '.'); | |
147 | hpux_major_release = p ? atoi (p + 1) : 0; | |
148 | } | |
149 | ||
150 | return hpux_major_release; | |
151 | } | |
152 | ||
153 | /* DL header flag defines. */ | |
154 | #define SHLIB_TEXT_PRIVATE_ENABLE 0x4000 | |
155 | ||
156 | /* The DL header is documented in <shl.h>. We are only interested | |
157 | in the flags field to determine whether the executable wants shared | |
158 | libraries mapped private. */ | |
159 | struct { | |
160 | short junk[37]; | |
161 | short flags; | |
162 | } dl_header; | |
163 | ||
419b8bfb RC |
164 | /* This hook gets called just before the first instruction in the |
165 | inferior process is executed. | |
166 | ||
167 | This is our opportunity to set magic flags in the inferior so | |
168 | that GDB can be notified when a shared library is mapped in and | |
169 | to tell the dynamic linker that a private copy of the library is | |
170 | needed (so GDB can set breakpoints in the library). | |
171 | ||
172 | __dld_flags is the location of the magic flags; as of this implementation | |
173 | there are 3 flags of interest: | |
174 | ||
175 | bit 0 when set indicates that private copies of the libraries are needed | |
176 | bit 1 when set indicates that the callback hook routine is valid | |
177 | bit 2 when set indicates that the dynamic linker should maintain the | |
178 | __dld_list structure when loading/unloading libraries. | |
179 | ||
180 | Note that shared libraries are not mapped in at this time, so we have | |
181 | run the inferior until the libraries are mapped in. Typically this | |
182 | means running until the "_start" is called. */ | |
183 | ||
184 | static void | |
185 | som_solib_create_inferior_hook (void) | |
186 | { | |
e17a4113 | 187 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
419b8bfb RC |
188 | struct minimal_symbol *msymbol; |
189 | unsigned int dld_flags, status, have_endo; | |
190 | asection *shlib_info; | |
191 | char buf[4]; | |
419b8bfb RC |
192 | CORE_ADDR anaddr; |
193 | ||
194 | /* First, remove all the solib event breakpoints. Their addresses | |
195 | may have changed since the last time we ran the program. */ | |
196 | remove_solib_event_breakpoints (); | |
197 | ||
198 | if (symfile_objfile == NULL) | |
199 | return; | |
200 | ||
201 | /* First see if the objfile was dynamically linked. */ | |
202 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); | |
203 | if (!shlib_info) | |
204 | return; | |
205 | ||
206 | /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */ | |
207 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) | |
208 | return; | |
209 | ||
7be67755 DA |
210 | /* Read the DL header. */ |
211 | bfd_get_section_contents (symfile_objfile->obfd, shlib_info, | |
212 | (char *) &dl_header, 0, sizeof (dl_header)); | |
213 | ||
419b8bfb RC |
214 | have_endo = 0; |
215 | /* Slam the pid of the process into __d_pid. | |
216 | ||
217 | We used to warn when this failed, but that warning is only useful | |
218 | on very old HP systems (hpux9 and older). The warnings are an | |
219 | annoyance to users of modern systems and foul up the testsuite as | |
220 | well. As a result, the warnings have been disabled. */ | |
221 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); | |
222 | if (msymbol == NULL) | |
223 | goto keep_going; | |
224 | ||
225 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
e17a4113 | 226 | store_unsigned_integer (buf, 4, byte_order, PIDGET (inferior_ptid)); |
419b8bfb RC |
227 | status = target_write_memory (anaddr, buf, 4); |
228 | if (status != 0) | |
229 | { | |
8a3fe4f8 AC |
230 | warning (_("\ |
231 | Unable to write __d_pid.\n\ | |
232 | Suggest linking with /opt/langtools/lib/end.o.\n\ | |
233 | GDB will be unable to track shl_load/shl_unload calls")); | |
419b8bfb RC |
234 | goto keep_going; |
235 | } | |
236 | ||
237 | /* Get the value of _DLD_HOOK (an export stub) and put it in __dld_hook; | |
238 | This will force the dynamic linker to call __d_trap when significant | |
239 | events occur. | |
240 | ||
241 | Note that the above is the pre-HP-UX 9.0 behaviour. At 9.0 and above, | |
242 | the dld provides an export stub named "__d_trap" as well as the | |
243 | function named "__d_trap" itself, but doesn't provide "_DLD_HOOK". | |
244 | We'll look first for the old flavor and then the new. | |
245 | */ | |
246 | msymbol = lookup_minimal_symbol ("_DLD_HOOK", NULL, symfile_objfile); | |
247 | if (msymbol == NULL) | |
248 | msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile); | |
249 | if (msymbol == NULL) | |
250 | { | |
8a3fe4f8 AC |
251 | warning (_("\ |
252 | Unable to find _DLD_HOOK symbol in object file.\n\ | |
253 | Suggest linking with /opt/langtools/lib/end.o.\n\ | |
254 | GDB will be unable to track shl_load/shl_unload calls")); | |
419b8bfb RC |
255 | goto keep_going; |
256 | } | |
257 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
258 | dld_cache.hook.address = anaddr; | |
259 | ||
260 | /* Grrr, this might not be an export symbol! We have to find the | |
261 | export stub. */ | |
ff644745 JB |
262 | msymbol = hppa_lookup_stub_minimal_symbol (SYMBOL_LINKAGE_NAME (msymbol), |
263 | EXPORT); | |
264 | if (msymbol != NULL) | |
265 | { | |
266 | anaddr = SYMBOL_VALUE (msymbol); | |
267 | dld_cache.hook_stub.address = anaddr; | |
268 | } | |
e17a4113 | 269 | store_unsigned_integer (buf, 4, byte_order, anaddr); |
419b8bfb RC |
270 | |
271 | msymbol = lookup_minimal_symbol ("__dld_hook", NULL, symfile_objfile); | |
272 | if (msymbol == NULL) | |
273 | { | |
8a3fe4f8 AC |
274 | warning (_("\ |
275 | Unable to find __dld_hook symbol in object file.\n\ | |
276 | Suggest linking with /opt/langtools/lib/end.o.\n\ | |
277 | GDB will be unable to track shl_load/shl_unload calls")); | |
419b8bfb RC |
278 | goto keep_going; |
279 | } | |
280 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
281 | status = target_write_memory (anaddr, buf, 4); | |
282 | ||
283 | /* Now set a shlib_event breakpoint at __d_trap so we can track | |
284 | significant shared library events. */ | |
285 | msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile); | |
286 | if (msymbol == NULL) | |
287 | { | |
a3f17187 | 288 | warning (_("\ |
8a3fe4f8 AC |
289 | Unable to find __dld_d_trap symbol in object file.\n\ |
290 | Suggest linking with /opt/langtools/lib/end.o.\n\ | |
291 | GDB will be unable to track shl_load/shl_unload calls")); | |
419b8bfb RC |
292 | goto keep_going; |
293 | } | |
a6d9a66e UW |
294 | create_solib_event_breakpoint (target_gdbarch, |
295 | SYMBOL_VALUE_ADDRESS (msymbol)); | |
419b8bfb RC |
296 | |
297 | /* We have all the support usually found in end.o, so we can track | |
298 | shl_load and shl_unload calls. */ | |
299 | have_endo = 1; | |
300 | ||
301 | keep_going: | |
302 | ||
303 | /* Get the address of __dld_flags, if no such symbol exists, then we can | |
304 | not debug the shared code. */ | |
305 | msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL); | |
306 | if (msymbol == NULL) | |
307 | { | |
8a3fe4f8 | 308 | error (_("Unable to find __dld_flags symbol in object file.")); |
419b8bfb RC |
309 | } |
310 | ||
311 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
312 | ||
313 | /* Read the current contents. */ | |
314 | status = target_read_memory (anaddr, buf, 4); | |
315 | if (status != 0) | |
8a3fe4f8 | 316 | error (_("Unable to read __dld_flags.")); |
e17a4113 | 317 | dld_flags = extract_unsigned_integer (buf, 4, byte_order); |
419b8bfb | 318 | |
7be67755 DA |
319 | /* If the libraries were not mapped private on HP-UX 11 and later, warn |
320 | the user. On HP-UX 10 and earlier, there is no easy way to specify | |
321 | that shared libraries should be privately mapped. So, we just force | |
322 | private mapping. */ | |
323 | if (get_hpux_major_release () >= 11 | |
324 | && (dl_header.flags & SHLIB_TEXT_PRIVATE_ENABLE) == 0 | |
325 | && (dld_flags & DLD_FLAGS_MAPPRIVATE) == 0) | |
326 | warning | |
327 | (_("Private mapping of shared library text was not specified\n" | |
328 | "by the executable; setting a breakpoint in a shared library which\n" | |
329 | "is not privately mapped will not work. See the HP-UX 11i v3 chatr\n" | |
330 | "manpage for methods to privately map shared library text.")); | |
331 | ||
419b8bfb | 332 | /* Turn on the flags we care about. */ |
7be67755 DA |
333 | if (get_hpux_major_release () < 11) |
334 | dld_flags |= DLD_FLAGS_MAPPRIVATE; | |
419b8bfb RC |
335 | if (have_endo) |
336 | dld_flags |= DLD_FLAGS_HOOKVALID; | |
e17a4113 | 337 | store_unsigned_integer (buf, 4, byte_order, dld_flags); |
419b8bfb RC |
338 | status = target_write_memory (anaddr, buf, 4); |
339 | if (status != 0) | |
8a3fe4f8 | 340 | error (_("Unable to write __dld_flags.")); |
419b8bfb RC |
341 | |
342 | /* Now find the address of _start and set a breakpoint there. | |
343 | We still need this code for two reasons: | |
344 | ||
345 | * Not all sites have /opt/langtools/lib/end.o, so it's not always | |
346 | possible to track the dynamic linker's events. | |
347 | ||
348 | * At this time no events are triggered for shared libraries | |
349 | loaded at startup time (what a crock). */ | |
350 | ||
351 | msymbol = lookup_minimal_symbol ("_start", NULL, symfile_objfile); | |
352 | if (msymbol == NULL) | |
8a3fe4f8 | 353 | error (_("Unable to find _start symbol in object file.")); |
419b8bfb RC |
354 | |
355 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
356 | ||
357 | /* Make the breakpoint at "_start" a shared library event breakpoint. */ | |
a6d9a66e | 358 | create_solib_event_breakpoint (target_gdbarch, anaddr); |
419b8bfb RC |
359 | |
360 | clear_symtab_users (); | |
361 | } | |
362 | ||
419b8bfb RC |
363 | static void |
364 | som_special_symbol_handling (void) | |
365 | { | |
366 | } | |
367 | ||
368 | static void | |
369 | som_solib_desire_dynamic_linker_symbols (void) | |
370 | { | |
371 | struct objfile *objfile; | |
372 | struct unwind_table_entry *u; | |
373 | struct minimal_symbol *dld_msymbol; | |
374 | ||
375 | /* Do we already know the value of these symbols? If so, then | |
376 | we've no work to do. | |
377 | ||
378 | (If you add clauses to this test, be sure to likewise update the | |
379 | test within the loop.) | |
380 | */ | |
381 | if (dld_cache.is_valid) | |
382 | return; | |
383 | ||
384 | ALL_OBJFILES (objfile) | |
385 | { | |
386 | dld_msymbol = lookup_minimal_symbol ("shl_load", NULL, objfile); | |
387 | if (dld_msymbol != NULL) | |
388 | { | |
389 | dld_cache.load.address = SYMBOL_VALUE (dld_msymbol); | |
390 | dld_cache.load.unwind = find_unwind_entry (dld_cache.load.address); | |
391 | } | |
392 | ||
393 | dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_load", | |
394 | objfile); | |
395 | if (dld_msymbol != NULL) | |
396 | { | |
712f90be | 397 | if (MSYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline) |
419b8bfb RC |
398 | { |
399 | u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol)); | |
400 | if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT)) | |
401 | { | |
402 | dld_cache.load_stub.address = SYMBOL_VALUE (dld_msymbol); | |
403 | dld_cache.load_stub.unwind = u; | |
404 | } | |
405 | } | |
406 | } | |
407 | ||
408 | dld_msymbol = lookup_minimal_symbol ("shl_unload", NULL, objfile); | |
409 | if (dld_msymbol != NULL) | |
410 | { | |
411 | dld_cache.unload.address = SYMBOL_VALUE (dld_msymbol); | |
412 | dld_cache.unload.unwind = find_unwind_entry (dld_cache.unload.address); | |
413 | ||
414 | /* ??rehrauer: I'm not sure exactly what this is, but it appears | |
415 | that on some HPUX 10.x versions, there's two unwind regions to | |
416 | cover the body of "shl_unload", the second being 4 bytes past | |
417 | the end of the first. This is a large hack to handle that | |
418 | case, but since I don't seem to have any legitimate way to | |
419 | look for this thing via the symbol table... | |
420 | */ | |
421 | if (dld_cache.unload.unwind != NULL) | |
422 | { | |
423 | u = find_unwind_entry (dld_cache.unload.unwind->region_end + 4); | |
424 | if (u != NULL) | |
425 | { | |
426 | dld_cache.unload2.address = u->region_start; | |
427 | dld_cache.unload2.unwind = u; | |
428 | } | |
429 | } | |
430 | } | |
431 | ||
432 | dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_unload", | |
433 | objfile); | |
434 | if (dld_msymbol != NULL) | |
435 | { | |
712f90be | 436 | if (MSYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline) |
419b8bfb RC |
437 | { |
438 | u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol)); | |
439 | if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT)) | |
440 | { | |
441 | dld_cache.unload_stub.address = SYMBOL_VALUE (dld_msymbol); | |
442 | dld_cache.unload_stub.unwind = u; | |
443 | } | |
444 | } | |
445 | } | |
446 | ||
447 | /* Did we find everything we were looking for? If so, stop. */ | |
448 | if ((dld_cache.load.address != 0) | |
449 | && (dld_cache.load_stub.address != 0) | |
450 | && (dld_cache.unload.address != 0) | |
451 | && (dld_cache.unload_stub.address != 0)) | |
452 | { | |
453 | dld_cache.is_valid = 1; | |
454 | break; | |
455 | } | |
456 | } | |
457 | ||
458 | dld_cache.hook.unwind = find_unwind_entry (dld_cache.hook.address); | |
459 | dld_cache.hook_stub.unwind = find_unwind_entry (dld_cache.hook_stub.address); | |
460 | ||
461 | /* We're prepared not to find some of these symbols, which is why | |
462 | this function is a "desire" operation, and not a "require". | |
463 | */ | |
464 | } | |
465 | ||
466 | static int | |
467 | som_in_dynsym_resolve_code (CORE_ADDR pc) | |
468 | { | |
469 | struct unwind_table_entry *u_pc; | |
470 | ||
471 | /* Are we in the dld itself? | |
472 | ||
473 | ??rehrauer: Large hack -- We'll assume that any address in a | |
474 | shared text region is the dld's text. This would obviously | |
475 | fall down if the user attached to a process, whose shlibs | |
476 | weren't mapped to a (writeable) private region. However, in | |
477 | that case the debugger probably isn't able to set the fundamental | |
478 | breakpoint in the dld callback anyways, so this hack should be | |
479 | safe. | |
480 | */ | |
481 | if ((pc & (CORE_ADDR) 0xc0000000) == (CORE_ADDR) 0xc0000000) | |
482 | return 1; | |
483 | ||
484 | /* Cache the address of some symbols that are part of the dynamic | |
485 | linker, if not already known. | |
486 | */ | |
487 | som_solib_desire_dynamic_linker_symbols (); | |
488 | ||
489 | /* Are we in the dld callback? Or its export stub? */ | |
490 | u_pc = find_unwind_entry (pc); | |
491 | if (u_pc == NULL) | |
492 | return 0; | |
493 | ||
494 | if ((u_pc == dld_cache.hook.unwind) || (u_pc == dld_cache.hook_stub.unwind)) | |
495 | return 1; | |
496 | ||
497 | /* Or the interface of the dld (i.e., "shl_load" or friends)? */ | |
498 | if ((u_pc == dld_cache.load.unwind) | |
499 | || (u_pc == dld_cache.unload.unwind) | |
500 | || (u_pc == dld_cache.unload2.unwind) | |
501 | || (u_pc == dld_cache.load_stub.unwind) | |
502 | || (u_pc == dld_cache.unload_stub.unwind)) | |
503 | return 1; | |
504 | ||
505 | /* Apparently this address isn't part of the dld's text. */ | |
506 | return 0; | |
507 | } | |
508 | ||
509 | static void | |
510 | som_clear_solib (void) | |
511 | { | |
512 | } | |
513 | ||
514 | struct dld_list { | |
515 | char name[4]; | |
516 | char info[4]; | |
517 | char text_addr[4]; | |
518 | char text_link_addr[4]; | |
519 | char text_end[4]; | |
520 | char data_start[4]; | |
521 | char bss_start[4]; | |
522 | char data_end[4]; | |
523 | char got_value[4]; | |
524 | char next[4]; | |
525 | char tsd_start_addr_ptr[4]; | |
526 | }; | |
527 | ||
528 | static CORE_ADDR | |
529 | link_map_start (void) | |
530 | { | |
e17a4113 | 531 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
419b8bfb RC |
532 | struct minimal_symbol *sym; |
533 | CORE_ADDR addr; | |
534 | char buf[4]; | |
535 | unsigned int dld_flags; | |
536 | ||
537 | sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL); | |
538 | if (!sym) | |
8a3fe4f8 | 539 | error (_("Unable to find __dld_flags symbol in object file.")); |
419b8bfb RC |
540 | addr = SYMBOL_VALUE_ADDRESS (sym); |
541 | read_memory (addr, buf, 4); | |
e17a4113 | 542 | dld_flags = extract_unsigned_integer (buf, 4, byte_order); |
419b8bfb | 543 | if ((dld_flags & DLD_FLAGS_LISTVALID) == 0) |
8a3fe4f8 | 544 | error (_("__dld_list is not valid according to __dld_flags.")); |
419b8bfb | 545 | |
419b8bfb RC |
546 | sym = lookup_minimal_symbol ("__dld_list", NULL, NULL); |
547 | if (!sym) | |
548 | { | |
549 | /* Older crt0.o files (hpux8) don't have __dld_list as a symbol, | |
550 | but the data is still available if you know where to look. */ | |
551 | sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL); | |
552 | if (!sym) | |
553 | { | |
8a3fe4f8 | 554 | error (_("Unable to find dynamic library list.")); |
419b8bfb RC |
555 | return 0; |
556 | } | |
557 | addr = SYMBOL_VALUE_ADDRESS (sym) - 8; | |
558 | } | |
559 | else | |
560 | addr = SYMBOL_VALUE_ADDRESS (sym); | |
561 | ||
562 | read_memory (addr, buf, 4); | |
e17a4113 | 563 | addr = extract_unsigned_integer (buf, 4, byte_order); |
419b8bfb | 564 | if (addr == 0) |
7fc4b1a1 | 565 | return 0; |
419b8bfb RC |
566 | |
567 | read_memory (addr, buf, 4); | |
e17a4113 | 568 | return extract_unsigned_integer (buf, 4, byte_order); |
419b8bfb RC |
569 | } |
570 | ||
571 | /* Does this so's name match the main binary? */ | |
572 | static int | |
573 | match_main (const char *name) | |
574 | { | |
575 | return strcmp (name, symfile_objfile->name) == 0; | |
576 | } | |
577 | ||
578 | static struct so_list * | |
579 | som_current_sos (void) | |
580 | { | |
e17a4113 | 581 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
419b8bfb RC |
582 | CORE_ADDR lm; |
583 | struct so_list *head = 0; | |
584 | struct so_list **link_ptr = &head; | |
585 | ||
586 | for (lm = link_map_start (); lm; ) | |
587 | { | |
588 | char *namebuf; | |
589 | CORE_ADDR addr; | |
590 | struct so_list *new; | |
591 | struct cleanup *old_chain; | |
592 | int errcode; | |
593 | struct dld_list dbuf; | |
594 | char tsdbuf[4]; | |
595 | ||
596 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
597 | old_chain = make_cleanup (xfree, new); | |
598 | ||
599 | memset (new, 0, sizeof (*new)); | |
600 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
601 | make_cleanup (xfree, new->lm_info); | |
602 | ||
fbdbf38b | 603 | read_memory (lm, (gdb_byte *)&dbuf, sizeof (struct dld_list)); |
419b8bfb | 604 | |
fbdbf38b | 605 | addr = extract_unsigned_integer ((gdb_byte *)&dbuf.name, |
e17a4113 | 606 | sizeof (dbuf.name), byte_order); |
419b8bfb RC |
607 | target_read_string (addr, &namebuf, SO_NAME_MAX_PATH_SIZE - 1, &errcode); |
608 | if (errcode != 0) | |
8a3fe4f8 AC |
609 | warning (_("Can't read pathname for load map: %s."), |
610 | safe_strerror (errcode)); | |
419b8bfb RC |
611 | else |
612 | { | |
613 | strncpy (new->so_name, namebuf, SO_NAME_MAX_PATH_SIZE - 1); | |
614 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
615 | xfree (namebuf); | |
616 | strcpy (new->so_original_name, new->so_name); | |
617 | } | |
618 | ||
619 | if (new->so_name[0] && !match_main (new->so_name)) | |
620 | { | |
621 | struct lm_info *lmi = new->lm_info; | |
622 | unsigned int tmp; | |
623 | ||
624 | lmi->lm_addr = lm; | |
625 | ||
626 | #define EXTRACT(_fld) \ | |
e17a4113 UW |
627 | extract_unsigned_integer ((gdb_byte *)&dbuf._fld, \ |
628 | sizeof (dbuf._fld), byte_order); | |
419b8bfb RC |
629 | |
630 | lmi->text_addr = EXTRACT (text_addr); | |
631 | tmp = EXTRACT (info); | |
632 | lmi->library_version = (tmp >> 16) & 0xffff; | |
633 | lmi->bind_mode = (tmp >> 8) & 0xff; | |
634 | lmi->struct_version = tmp & 0xff; | |
635 | lmi->text_link_addr = EXTRACT (text_link_addr); | |
636 | lmi->text_end = EXTRACT (text_end); | |
637 | lmi->data_start = EXTRACT (data_start); | |
638 | lmi->bss_start = EXTRACT (bss_start); | |
639 | lmi->data_end = EXTRACT (data_end); | |
640 | lmi->got_value = EXTRACT (got_value); | |
641 | tmp = EXTRACT (tsd_start_addr_ptr); | |
642 | read_memory (tmp, tsdbuf, 4); | |
e17a4113 UW |
643 | lmi->tsd_start_addr |
644 | = extract_unsigned_integer (tsdbuf, 4, byte_order); | |
419b8bfb RC |
645 | |
646 | #ifdef SOLIB_SOM_DBG | |
5af949e3 UW |
647 | printf ("\n+ library \"%s\" is described at %s\n", new->so_name, |
648 | paddress (target_gdbarch, lm)); | |
419b8bfb RC |
649 | printf (" 'version' is %d\n", new->lm_info->struct_version); |
650 | printf (" 'bind_mode' is %d\n", new->lm_info->bind_mode); | |
651 | printf (" 'library_version' is %d\n", | |
652 | new->lm_info->library_version); | |
5af949e3 UW |
653 | printf (" 'text_addr' is %s\n", |
654 | paddress (target_gdbarch, new->lm_info->text_addr)); | |
655 | printf (" 'text_link_addr' is %s\n", | |
656 | paddress (target_gdbarch, new->lm_info->text_link_addr)); | |
657 | printf (" 'text_end' is %s\n", | |
658 | paddress (target_gdbarch, new->lm_info->text_end)); | |
659 | printf (" 'data_start' is %s\n", | |
660 | paddress (target_gdbarch, new->lm_info->data_start)); | |
661 | printf (" 'bss_start' is %s\n", | |
662 | paddress (target_gdbarch, new->lm_info->bss_start)); | |
663 | printf (" 'data_end' is %s\n", | |
664 | paddress (target_gdbarch, new->lm_info->data_end)); | |
665 | printf (" 'got_value' is %s\n", | |
666 | paddress (target_gdbarch, new->lm_info->got_value)); | |
667 | printf (" 'tsd_start_addr' is %s\n", | |
668 | paddress (target_gdbarch, new->lm_info->tsd_start_addr)); | |
419b8bfb RC |
669 | #endif |
670 | ||
cfa9d6d9 DJ |
671 | new->addr_low = lmi->text_addr; |
672 | new->addr_high = lmi->text_end; | |
673 | ||
419b8bfb RC |
674 | /* Link the new object onto the list. */ |
675 | new->next = NULL; | |
676 | *link_ptr = new; | |
677 | link_ptr = &new->next; | |
678 | } | |
679 | else | |
680 | { | |
681 | free_so (new); | |
682 | } | |
683 | ||
684 | lm = EXTRACT (next); | |
685 | discard_cleanups (old_chain); | |
686 | #undef EXTRACT | |
687 | } | |
688 | ||
689 | /* TODO: The original somsolib code has logic to detect and eliminate | |
690 | duplicate entries. Do we need that? */ | |
691 | ||
692 | return head; | |
693 | } | |
694 | ||
695 | static int | |
696 | som_open_symbol_file_object (void *from_ttyp) | |
697 | { | |
e17a4113 | 698 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
419b8bfb RC |
699 | CORE_ADDR lm, l_name; |
700 | char *filename; | |
701 | int errcode; | |
702 | int from_tty = *(int *)from_ttyp; | |
703 | char buf[4]; | |
704 | ||
705 | if (symfile_objfile) | |
9e2f0ad4 | 706 | if (!query (_("Attempt to reload symbols from process? "))) |
419b8bfb RC |
707 | return 0; |
708 | ||
709 | /* First link map member should be the executable. */ | |
710 | if ((lm = link_map_start ()) == 0) | |
711 | return 0; /* failed somehow... */ | |
712 | ||
713 | /* Read address of name from target memory to GDB. */ | |
714 | read_memory (lm + offsetof (struct dld_list, name), buf, 4); | |
715 | ||
716 | /* Convert the address to host format. Assume that the address is | |
717 | unsigned. */ | |
e17a4113 | 718 | l_name = extract_unsigned_integer (buf, 4, byte_order); |
419b8bfb RC |
719 | |
720 | if (l_name == 0) | |
721 | return 0; /* No filename. */ | |
722 | ||
723 | /* Now fetch the filename from target memory. */ | |
724 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
725 | ||
726 | if (errcode) | |
727 | { | |
8a3fe4f8 | 728 | warning (_("failed to read exec filename from attached file: %s"), |
419b8bfb RC |
729 | safe_strerror (errcode)); |
730 | return 0; | |
731 | } | |
732 | ||
733 | make_cleanup (xfree, filename); | |
734 | /* Have a pathname: read the symbol file. */ | |
735 | symbol_file_add_main (filename, from_tty); | |
736 | ||
737 | return 1; | |
738 | } | |
739 | ||
740 | static void | |
741 | som_free_so (struct so_list *so) | |
742 | { | |
743 | xfree (so->lm_info); | |
744 | } | |
745 | ||
746 | static CORE_ADDR | |
747 | som_solib_thread_start_addr (struct so_list *so) | |
748 | { | |
749 | return so->lm_info->tsd_start_addr; | |
750 | } | |
751 | ||
752 | /* Return the GOT value for the shared library in which ADDR belongs. If | |
753 | ADDR isn't in any known shared library, return zero. */ | |
754 | ||
755 | static CORE_ADDR | |
756 | som_solib_get_got_by_pc (CORE_ADDR addr) | |
757 | { | |
758 | struct so_list *so_list = master_so_list (); | |
759 | CORE_ADDR got_value = 0; | |
760 | ||
761 | while (so_list) | |
762 | { | |
763 | if (so_list->lm_info->text_addr <= addr | |
764 | && so_list->lm_info->text_end > addr) | |
765 | { | |
766 | got_value = so_list->lm_info->got_value; | |
767 | break; | |
768 | } | |
769 | so_list = so_list->next; | |
770 | } | |
771 | return got_value; | |
772 | } | |
773 | ||
774 | /* Return the address of the handle of the shared library in which ADDR belongs. | |
775 | If ADDR isn't in any known shared library, return zero. */ | |
776 | /* this function is used in initialize_hp_cxx_exception_support in | |
777 | hppa-hpux-tdep.c */ | |
778 | ||
779 | static CORE_ADDR | |
780 | som_solib_get_solib_by_pc (CORE_ADDR addr) | |
781 | { | |
782 | struct so_list *so_list = master_so_list (); | |
783 | ||
784 | while (so_list) | |
785 | { | |
786 | if (so_list->lm_info->text_addr <= addr | |
787 | && so_list->lm_info->text_end > addr) | |
788 | { | |
789 | break; | |
790 | } | |
791 | so_list = so_list->next; | |
792 | } | |
793 | if (so_list) | |
794 | return so_list->lm_info->lm_addr; | |
795 | else | |
796 | return 0; | |
797 | } | |
798 | ||
799 | ||
800 | static struct target_so_ops som_so_ops; | |
801 | ||
802 | extern initialize_file_ftype _initialize_som_solib; /* -Wmissing-prototypes */ | |
803 | ||
804 | void | |
805 | _initialize_som_solib (void) | |
806 | { | |
807 | som_so_ops.relocate_section_addresses = som_relocate_section_addresses; | |
808 | som_so_ops.free_so = som_free_so; | |
809 | som_so_ops.clear_solib = som_clear_solib; | |
810 | som_so_ops.solib_create_inferior_hook = som_solib_create_inferior_hook; | |
811 | som_so_ops.special_symbol_handling = som_special_symbol_handling; | |
812 | som_so_ops.current_sos = som_current_sos; | |
813 | som_so_ops.open_symbol_file_object = som_open_symbol_file_object; | |
814 | som_so_ops.in_dynsym_resolve_code = som_in_dynsym_resolve_code; | |
831a0c44 | 815 | som_so_ops.bfd_open = solib_bfd_open; |
419b8bfb RC |
816 | } |
817 | ||
63807e1d PA |
818 | void |
819 | som_solib_select (struct gdbarch *gdbarch) | |
419b8bfb | 820 | { |
d542061a UW |
821 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
822 | set_solib_ops (gdbarch, &som_so_ops); | |
419b8bfb RC |
823 | |
824 | tdep->solib_thread_start_addr = som_solib_thread_start_addr; | |
825 | tdep->solib_get_got_by_pc = som_solib_get_got_by_pc; | |
826 | tdep->solib_get_solib_by_pc = som_solib_get_solib_by_pc; | |
827 | } | |
828 | ||
829 | /* The rest of these functions are not part of the solib interface; they | |
830 | are used by somread.c or hppa-hpux-tdep.c */ | |
831 | ||
832 | int | |
833 | som_solib_section_offsets (struct objfile *objfile, | |
834 | struct section_offsets *offsets) | |
835 | { | |
836 | struct so_list *so_list = master_so_list (); | |
837 | ||
838 | while (so_list) | |
839 | { | |
840 | /* Oh what a pain! We need the offsets before so_list->objfile | |
841 | is valid. The BFDs will never match. Make a best guess. */ | |
842 | if (strstr (objfile->name, so_list->so_name)) | |
843 | { | |
844 | asection *private_section; | |
845 | ||
846 | /* The text offset is easy. */ | |
847 | offsets->offsets[SECT_OFF_TEXT (objfile)] | |
848 | = (so_list->lm_info->text_addr | |
849 | - so_list->lm_info->text_link_addr); | |
850 | offsets->offsets[SECT_OFF_RODATA (objfile)] | |
851 | = ANOFFSET (offsets, SECT_OFF_TEXT (objfile)); | |
852 | ||
853 | /* We should look at presumed_dp in the SOM header, but | |
854 | that's not easily available. This should be OK though. */ | |
855 | private_section = bfd_get_section_by_name (objfile->obfd, | |
856 | "$PRIVATE$"); | |
857 | if (!private_section) | |
858 | { | |
8a3fe4f8 | 859 | warning (_("Unable to find $PRIVATE$ in shared library!")); |
419b8bfb RC |
860 | offsets->offsets[SECT_OFF_DATA (objfile)] = 0; |
861 | offsets->offsets[SECT_OFF_BSS (objfile)] = 0; | |
862 | return 1; | |
863 | } | |
864 | offsets->offsets[SECT_OFF_DATA (objfile)] | |
865 | = (so_list->lm_info->data_start - private_section->vma); | |
866 | offsets->offsets[SECT_OFF_BSS (objfile)] | |
867 | = ANOFFSET (offsets, SECT_OFF_DATA (objfile)); | |
868 | return 1; | |
869 | } | |
870 | so_list = so_list->next; | |
871 | } | |
872 | return 0; | |
873 | } |