Commit | Line | Data |
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fbdbf38b | 1 | /* Handle SOM shared libraries. |
419b8bfb | 2 | |
7b6bb8da | 3 | Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010, 2011 |
4c38e0a4 | 4 | Free Software Foundation, Inc. |
419b8bfb RC |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
419b8bfb RC |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
419b8bfb RC |
20 | |
21 | #include "defs.h" | |
419b8bfb RC |
22 | #include "symtab.h" |
23 | #include "bfd.h" | |
24 | #include "symfile.h" | |
25 | #include "objfiles.h" | |
26 | #include "gdbcore.h" | |
27 | #include "target.h" | |
28 | #include "inferior.h" | |
29 | ||
30 | #include "hppa-tdep.h" | |
31 | #include "solist.h" | |
d542061a | 32 | #include "solib.h" |
63807e1d | 33 | #include "solib-som.h" |
419b8bfb | 34 | |
7be67755 DA |
35 | #include <sys/utsname.h> |
36 | #include <string.h> | |
37 | ||
419b8bfb RC |
38 | #undef SOLIB_SOM_DBG |
39 | ||
40 | /* These ought to be defined in some public interface, but aren't. They | |
41 | define the meaning of the various bits in the distinguished __dld_flags | |
42 | variable that is declared in every debuggable a.out on HP-UX, and that | |
43 | is shared between the debugger and the dynamic linker. | |
44 | */ | |
45 | #define DLD_FLAGS_MAPPRIVATE 0x1 | |
46 | #define DLD_FLAGS_HOOKVALID 0x2 | |
47 | #define DLD_FLAGS_LISTVALID 0x4 | |
48 | #define DLD_FLAGS_BOR_ENABLE 0x8 | |
49 | ||
50 | struct lm_info | |
51 | { | |
3e43a32a MS |
52 | /* Version of this structure (it is expected to change again in |
53 | hpux10). */ | |
419b8bfb RC |
54 | unsigned char struct_version; |
55 | ||
56 | /* Binding mode for this library. */ | |
57 | unsigned char bind_mode; | |
58 | ||
59 | /* Version of this library. */ | |
60 | short library_version; | |
61 | ||
62 | /* Start of text address, | |
63 | link-time text location (length of text area), | |
64 | end of text address. */ | |
65 | CORE_ADDR text_addr; | |
66 | CORE_ADDR text_link_addr; | |
67 | CORE_ADDR text_end; | |
68 | ||
69 | /* Start of data, start of bss and end of data. */ | |
70 | CORE_ADDR data_start; | |
71 | CORE_ADDR bss_start; | |
72 | CORE_ADDR data_end; | |
73 | ||
74 | /* Value of linkage pointer (%r19). */ | |
75 | CORE_ADDR got_value; | |
76 | ||
77 | /* Address in target of offset from thread-local register of | |
78 | start of this thread's data. I.e., the first thread-local | |
79 | variable in this shared library starts at *(tsd_start_addr) | |
80 | from that area pointed to by cr27 (mpsfu_hi). | |
81 | ||
82 | We do the indirection as soon as we read it, so from then | |
83 | on it's the offset itself. */ | |
84 | CORE_ADDR tsd_start_addr; | |
85 | ||
86 | /* Address of the link map entry in the loader. */ | |
87 | CORE_ADDR lm_addr; | |
88 | }; | |
89 | ||
90 | /* These addresses should be filled in by som_solib_create_inferior_hook. | |
91 | They are also used elsewhere in this module. | |
92 | */ | |
93 | typedef struct | |
94 | { | |
95 | CORE_ADDR address; | |
96 | struct unwind_table_entry *unwind; | |
97 | } | |
98 | addr_and_unwind_t; | |
99 | ||
100 | /* When adding fields, be sure to clear them in _initialize_som_solib. */ | |
101 | static struct | |
102 | { | |
103 | int is_valid; | |
104 | addr_and_unwind_t hook; | |
105 | addr_and_unwind_t hook_stub; | |
106 | addr_and_unwind_t load; | |
107 | addr_and_unwind_t load_stub; | |
108 | addr_and_unwind_t unload; | |
109 | addr_and_unwind_t unload2; | |
110 | addr_and_unwind_t unload_stub; | |
111 | } | |
112 | dld_cache; | |
113 | ||
114 | static void | |
115 | som_relocate_section_addresses (struct so_list *so, | |
0542c86d | 116 | struct target_section *sec) |
419b8bfb RC |
117 | { |
118 | flagword aflag = bfd_get_section_flags(so->abfd, sec->the_bfd_section); | |
119 | ||
419b8bfb RC |
120 | if (aflag & SEC_CODE) |
121 | { | |
122 | sec->addr += so->lm_info->text_addr - so->lm_info->text_link_addr; | |
123 | sec->endaddr += so->lm_info->text_addr - so->lm_info->text_link_addr; | |
124 | } | |
125 | else if (aflag & SEC_DATA) | |
126 | { | |
127 | sec->addr += so->lm_info->data_start; | |
128 | sec->endaddr += so->lm_info->data_start; | |
129 | } | |
130 | else | |
131 | ; | |
132 | } | |
133 | ||
7be67755 DA |
134 | /* Get HP-UX major release number. Returns zero if the |
135 | release is not known. */ | |
136 | ||
137 | static int | |
138 | get_hpux_major_release (void) | |
139 | { | |
140 | static int hpux_major_release = -1; | |
141 | ||
142 | if (hpux_major_release == -1) | |
143 | { | |
144 | struct utsname x; | |
145 | char *p; | |
146 | ||
147 | uname (&x); | |
148 | p = strchr (x.release, '.'); | |
149 | hpux_major_release = p ? atoi (p + 1) : 0; | |
150 | } | |
151 | ||
152 | return hpux_major_release; | |
153 | } | |
154 | ||
155 | /* DL header flag defines. */ | |
156 | #define SHLIB_TEXT_PRIVATE_ENABLE 0x4000 | |
157 | ||
158 | /* The DL header is documented in <shl.h>. We are only interested | |
159 | in the flags field to determine whether the executable wants shared | |
160 | libraries mapped private. */ | |
161 | struct { | |
162 | short junk[37]; | |
163 | short flags; | |
164 | } dl_header; | |
165 | ||
419b8bfb RC |
166 | /* This hook gets called just before the first instruction in the |
167 | inferior process is executed. | |
168 | ||
169 | This is our opportunity to set magic flags in the inferior so | |
170 | that GDB can be notified when a shared library is mapped in and | |
171 | to tell the dynamic linker that a private copy of the library is | |
172 | needed (so GDB can set breakpoints in the library). | |
173 | ||
174 | __dld_flags is the location of the magic flags; as of this implementation | |
175 | there are 3 flags of interest: | |
176 | ||
177 | bit 0 when set indicates that private copies of the libraries are needed | |
178 | bit 1 when set indicates that the callback hook routine is valid | |
179 | bit 2 when set indicates that the dynamic linker should maintain the | |
180 | __dld_list structure when loading/unloading libraries. | |
181 | ||
182 | Note that shared libraries are not mapped in at this time, so we have | |
183 | run the inferior until the libraries are mapped in. Typically this | |
184 | means running until the "_start" is called. */ | |
185 | ||
186 | static void | |
268a4a75 | 187 | som_solib_create_inferior_hook (int from_tty) |
419b8bfb | 188 | { |
e17a4113 | 189 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
419b8bfb RC |
190 | struct minimal_symbol *msymbol; |
191 | unsigned int dld_flags, status, have_endo; | |
192 | asection *shlib_info; | |
193 | char buf[4]; | |
419b8bfb RC |
194 | CORE_ADDR anaddr; |
195 | ||
419b8bfb RC |
196 | if (symfile_objfile == NULL) |
197 | return; | |
198 | ||
199 | /* First see if the objfile was dynamically linked. */ | |
200 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); | |
201 | if (!shlib_info) | |
202 | return; | |
203 | ||
204 | /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */ | |
205 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) | |
206 | return; | |
207 | ||
7be67755 DA |
208 | /* Read the DL header. */ |
209 | bfd_get_section_contents (symfile_objfile->obfd, shlib_info, | |
210 | (char *) &dl_header, 0, sizeof (dl_header)); | |
211 | ||
419b8bfb RC |
212 | have_endo = 0; |
213 | /* Slam the pid of the process into __d_pid. | |
214 | ||
215 | We used to warn when this failed, but that warning is only useful | |
216 | on very old HP systems (hpux9 and older). The warnings are an | |
217 | annoyance to users of modern systems and foul up the testsuite as | |
218 | well. As a result, the warnings have been disabled. */ | |
219 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); | |
220 | if (msymbol == NULL) | |
221 | goto keep_going; | |
222 | ||
223 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
e17a4113 | 224 | store_unsigned_integer (buf, 4, byte_order, PIDGET (inferior_ptid)); |
419b8bfb RC |
225 | status = target_write_memory (anaddr, buf, 4); |
226 | if (status != 0) | |
227 | { | |
3e43a32a MS |
228 | warning (_("Unable to write __d_pid.\n" |
229 | "Suggest linking with /opt/langtools/lib/end.o.\n" | |
230 | "GDB will be unable to track shl_load/shl_unload calls")); | |
419b8bfb RC |
231 | goto keep_going; |
232 | } | |
233 | ||
234 | /* Get the value of _DLD_HOOK (an export stub) and put it in __dld_hook; | |
235 | This will force the dynamic linker to call __d_trap when significant | |
236 | events occur. | |
237 | ||
238 | Note that the above is the pre-HP-UX 9.0 behaviour. At 9.0 and above, | |
239 | the dld provides an export stub named "__d_trap" as well as the | |
240 | function named "__d_trap" itself, but doesn't provide "_DLD_HOOK". | |
241 | We'll look first for the old flavor and then the new. | |
242 | */ | |
243 | msymbol = lookup_minimal_symbol ("_DLD_HOOK", NULL, symfile_objfile); | |
244 | if (msymbol == NULL) | |
245 | msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile); | |
246 | if (msymbol == NULL) | |
247 | { | |
3e43a32a MS |
248 | warning (_("Unable to find _DLD_HOOK symbol in object file.\n" |
249 | "Suggest linking with /opt/langtools/lib/end.o.\n" | |
250 | "GDB will be unable to track shl_load/shl_unload calls")); | |
419b8bfb RC |
251 | goto keep_going; |
252 | } | |
253 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
254 | dld_cache.hook.address = anaddr; | |
255 | ||
256 | /* Grrr, this might not be an export symbol! We have to find the | |
257 | export stub. */ | |
ff644745 JB |
258 | msymbol = hppa_lookup_stub_minimal_symbol (SYMBOL_LINKAGE_NAME (msymbol), |
259 | EXPORT); | |
260 | if (msymbol != NULL) | |
261 | { | |
262 | anaddr = SYMBOL_VALUE (msymbol); | |
263 | dld_cache.hook_stub.address = anaddr; | |
264 | } | |
e17a4113 | 265 | store_unsigned_integer (buf, 4, byte_order, anaddr); |
419b8bfb RC |
266 | |
267 | msymbol = lookup_minimal_symbol ("__dld_hook", NULL, symfile_objfile); | |
268 | if (msymbol == NULL) | |
269 | { | |
3e43a32a MS |
270 | warning (_("Unable to find __dld_hook symbol in object file.\n" |
271 | "Suggest linking with /opt/langtools/lib/end.o.\n" | |
272 | "GDB will be unable to track shl_load/shl_unload calls")); | |
419b8bfb RC |
273 | goto keep_going; |
274 | } | |
275 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
276 | status = target_write_memory (anaddr, buf, 4); | |
277 | ||
278 | /* Now set a shlib_event breakpoint at __d_trap so we can track | |
279 | significant shared library events. */ | |
280 | msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile); | |
281 | if (msymbol == NULL) | |
282 | { | |
3e43a32a MS |
283 | warning (_("Unable to find __dld_d_trap symbol in object file.\n" |
284 | "Suggest linking with /opt/langtools/lib/end.o.\n" | |
285 | "GDB will be unable to track shl_load/shl_unload calls")); | |
419b8bfb RC |
286 | goto keep_going; |
287 | } | |
a6d9a66e UW |
288 | create_solib_event_breakpoint (target_gdbarch, |
289 | SYMBOL_VALUE_ADDRESS (msymbol)); | |
419b8bfb RC |
290 | |
291 | /* We have all the support usually found in end.o, so we can track | |
292 | shl_load and shl_unload calls. */ | |
293 | have_endo = 1; | |
294 | ||
295 | keep_going: | |
296 | ||
297 | /* Get the address of __dld_flags, if no such symbol exists, then we can | |
298 | not debug the shared code. */ | |
299 | msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL); | |
300 | if (msymbol == NULL) | |
301 | { | |
8a3fe4f8 | 302 | error (_("Unable to find __dld_flags symbol in object file.")); |
419b8bfb RC |
303 | } |
304 | ||
305 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
306 | ||
307 | /* Read the current contents. */ | |
308 | status = target_read_memory (anaddr, buf, 4); | |
309 | if (status != 0) | |
8a3fe4f8 | 310 | error (_("Unable to read __dld_flags.")); |
e17a4113 | 311 | dld_flags = extract_unsigned_integer (buf, 4, byte_order); |
419b8bfb | 312 | |
7be67755 DA |
313 | /* If the libraries were not mapped private on HP-UX 11 and later, warn |
314 | the user. On HP-UX 10 and earlier, there is no easy way to specify | |
315 | that shared libraries should be privately mapped. So, we just force | |
316 | private mapping. */ | |
317 | if (get_hpux_major_release () >= 11 | |
318 | && (dl_header.flags & SHLIB_TEXT_PRIVATE_ENABLE) == 0 | |
319 | && (dld_flags & DLD_FLAGS_MAPPRIVATE) == 0) | |
320 | warning | |
321 | (_("Private mapping of shared library text was not specified\n" | |
322 | "by the executable; setting a breakpoint in a shared library which\n" | |
323 | "is not privately mapped will not work. See the HP-UX 11i v3 chatr\n" | |
324 | "manpage for methods to privately map shared library text.")); | |
325 | ||
419b8bfb | 326 | /* Turn on the flags we care about. */ |
7be67755 DA |
327 | if (get_hpux_major_release () < 11) |
328 | dld_flags |= DLD_FLAGS_MAPPRIVATE; | |
419b8bfb RC |
329 | if (have_endo) |
330 | dld_flags |= DLD_FLAGS_HOOKVALID; | |
e17a4113 | 331 | store_unsigned_integer (buf, 4, byte_order, dld_flags); |
419b8bfb RC |
332 | status = target_write_memory (anaddr, buf, 4); |
333 | if (status != 0) | |
8a3fe4f8 | 334 | error (_("Unable to write __dld_flags.")); |
419b8bfb RC |
335 | |
336 | /* Now find the address of _start and set a breakpoint there. | |
337 | We still need this code for two reasons: | |
338 | ||
339 | * Not all sites have /opt/langtools/lib/end.o, so it's not always | |
340 | possible to track the dynamic linker's events. | |
341 | ||
342 | * At this time no events are triggered for shared libraries | |
343 | loaded at startup time (what a crock). */ | |
344 | ||
345 | msymbol = lookup_minimal_symbol ("_start", NULL, symfile_objfile); | |
346 | if (msymbol == NULL) | |
8a3fe4f8 | 347 | error (_("Unable to find _start symbol in object file.")); |
419b8bfb RC |
348 | |
349 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
350 | ||
351 | /* Make the breakpoint at "_start" a shared library event breakpoint. */ | |
a6d9a66e | 352 | create_solib_event_breakpoint (target_gdbarch, anaddr); |
419b8bfb | 353 | |
c1e56572 | 354 | clear_symtab_users (0); |
419b8bfb RC |
355 | } |
356 | ||
419b8bfb RC |
357 | static void |
358 | som_special_symbol_handling (void) | |
359 | { | |
360 | } | |
361 | ||
362 | static void | |
363 | som_solib_desire_dynamic_linker_symbols (void) | |
364 | { | |
365 | struct objfile *objfile; | |
366 | struct unwind_table_entry *u; | |
367 | struct minimal_symbol *dld_msymbol; | |
368 | ||
369 | /* Do we already know the value of these symbols? If so, then | |
370 | we've no work to do. | |
371 | ||
372 | (If you add clauses to this test, be sure to likewise update the | |
373 | test within the loop.) | |
374 | */ | |
375 | if (dld_cache.is_valid) | |
376 | return; | |
377 | ||
378 | ALL_OBJFILES (objfile) | |
379 | { | |
380 | dld_msymbol = lookup_minimal_symbol ("shl_load", NULL, objfile); | |
381 | if (dld_msymbol != NULL) | |
382 | { | |
383 | dld_cache.load.address = SYMBOL_VALUE (dld_msymbol); | |
384 | dld_cache.load.unwind = find_unwind_entry (dld_cache.load.address); | |
385 | } | |
386 | ||
387 | dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_load", | |
388 | objfile); | |
389 | if (dld_msymbol != NULL) | |
390 | { | |
712f90be | 391 | if (MSYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline) |
419b8bfb RC |
392 | { |
393 | u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol)); | |
394 | if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT)) | |
395 | { | |
396 | dld_cache.load_stub.address = SYMBOL_VALUE (dld_msymbol); | |
397 | dld_cache.load_stub.unwind = u; | |
398 | } | |
399 | } | |
400 | } | |
401 | ||
402 | dld_msymbol = lookup_minimal_symbol ("shl_unload", NULL, objfile); | |
403 | if (dld_msymbol != NULL) | |
404 | { | |
405 | dld_cache.unload.address = SYMBOL_VALUE (dld_msymbol); | |
406 | dld_cache.unload.unwind = find_unwind_entry (dld_cache.unload.address); | |
407 | ||
408 | /* ??rehrauer: I'm not sure exactly what this is, but it appears | |
409 | that on some HPUX 10.x versions, there's two unwind regions to | |
410 | cover the body of "shl_unload", the second being 4 bytes past | |
411 | the end of the first. This is a large hack to handle that | |
412 | case, but since I don't seem to have any legitimate way to | |
413 | look for this thing via the symbol table... | |
414 | */ | |
415 | if (dld_cache.unload.unwind != NULL) | |
416 | { | |
417 | u = find_unwind_entry (dld_cache.unload.unwind->region_end + 4); | |
418 | if (u != NULL) | |
419 | { | |
420 | dld_cache.unload2.address = u->region_start; | |
421 | dld_cache.unload2.unwind = u; | |
422 | } | |
423 | } | |
424 | } | |
425 | ||
426 | dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_unload", | |
427 | objfile); | |
428 | if (dld_msymbol != NULL) | |
429 | { | |
712f90be | 430 | if (MSYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline) |
419b8bfb RC |
431 | { |
432 | u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol)); | |
433 | if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT)) | |
434 | { | |
435 | dld_cache.unload_stub.address = SYMBOL_VALUE (dld_msymbol); | |
436 | dld_cache.unload_stub.unwind = u; | |
437 | } | |
438 | } | |
439 | } | |
440 | ||
441 | /* Did we find everything we were looking for? If so, stop. */ | |
442 | if ((dld_cache.load.address != 0) | |
443 | && (dld_cache.load_stub.address != 0) | |
444 | && (dld_cache.unload.address != 0) | |
445 | && (dld_cache.unload_stub.address != 0)) | |
446 | { | |
447 | dld_cache.is_valid = 1; | |
448 | break; | |
449 | } | |
450 | } | |
451 | ||
452 | dld_cache.hook.unwind = find_unwind_entry (dld_cache.hook.address); | |
453 | dld_cache.hook_stub.unwind = find_unwind_entry (dld_cache.hook_stub.address); | |
454 | ||
455 | /* We're prepared not to find some of these symbols, which is why | |
456 | this function is a "desire" operation, and not a "require". | |
457 | */ | |
458 | } | |
459 | ||
460 | static int | |
461 | som_in_dynsym_resolve_code (CORE_ADDR pc) | |
462 | { | |
463 | struct unwind_table_entry *u_pc; | |
464 | ||
465 | /* Are we in the dld itself? | |
466 | ||
467 | ??rehrauer: Large hack -- We'll assume that any address in a | |
468 | shared text region is the dld's text. This would obviously | |
469 | fall down if the user attached to a process, whose shlibs | |
470 | weren't mapped to a (writeable) private region. However, in | |
471 | that case the debugger probably isn't able to set the fundamental | |
472 | breakpoint in the dld callback anyways, so this hack should be | |
473 | safe. | |
474 | */ | |
475 | if ((pc & (CORE_ADDR) 0xc0000000) == (CORE_ADDR) 0xc0000000) | |
476 | return 1; | |
477 | ||
478 | /* Cache the address of some symbols that are part of the dynamic | |
479 | linker, if not already known. | |
480 | */ | |
481 | som_solib_desire_dynamic_linker_symbols (); | |
482 | ||
483 | /* Are we in the dld callback? Or its export stub? */ | |
484 | u_pc = find_unwind_entry (pc); | |
485 | if (u_pc == NULL) | |
486 | return 0; | |
487 | ||
488 | if ((u_pc == dld_cache.hook.unwind) || (u_pc == dld_cache.hook_stub.unwind)) | |
489 | return 1; | |
490 | ||
491 | /* Or the interface of the dld (i.e., "shl_load" or friends)? */ | |
492 | if ((u_pc == dld_cache.load.unwind) | |
493 | || (u_pc == dld_cache.unload.unwind) | |
494 | || (u_pc == dld_cache.unload2.unwind) | |
495 | || (u_pc == dld_cache.load_stub.unwind) | |
496 | || (u_pc == dld_cache.unload_stub.unwind)) | |
497 | return 1; | |
498 | ||
499 | /* Apparently this address isn't part of the dld's text. */ | |
500 | return 0; | |
501 | } | |
502 | ||
503 | static void | |
504 | som_clear_solib (void) | |
505 | { | |
506 | } | |
507 | ||
508 | struct dld_list { | |
509 | char name[4]; | |
510 | char info[4]; | |
511 | char text_addr[4]; | |
512 | char text_link_addr[4]; | |
513 | char text_end[4]; | |
514 | char data_start[4]; | |
515 | char bss_start[4]; | |
516 | char data_end[4]; | |
517 | char got_value[4]; | |
518 | char next[4]; | |
519 | char tsd_start_addr_ptr[4]; | |
520 | }; | |
521 | ||
522 | static CORE_ADDR | |
523 | link_map_start (void) | |
524 | { | |
e17a4113 | 525 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
419b8bfb RC |
526 | struct minimal_symbol *sym; |
527 | CORE_ADDR addr; | |
528 | char buf[4]; | |
529 | unsigned int dld_flags; | |
530 | ||
531 | sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL); | |
532 | if (!sym) | |
8a3fe4f8 | 533 | error (_("Unable to find __dld_flags symbol in object file.")); |
419b8bfb RC |
534 | addr = SYMBOL_VALUE_ADDRESS (sym); |
535 | read_memory (addr, buf, 4); | |
e17a4113 | 536 | dld_flags = extract_unsigned_integer (buf, 4, byte_order); |
419b8bfb | 537 | if ((dld_flags & DLD_FLAGS_LISTVALID) == 0) |
8a3fe4f8 | 538 | error (_("__dld_list is not valid according to __dld_flags.")); |
419b8bfb | 539 | |
419b8bfb RC |
540 | sym = lookup_minimal_symbol ("__dld_list", NULL, NULL); |
541 | if (!sym) | |
542 | { | |
543 | /* Older crt0.o files (hpux8) don't have __dld_list as a symbol, | |
544 | but the data is still available if you know where to look. */ | |
545 | sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL); | |
546 | if (!sym) | |
547 | { | |
8a3fe4f8 | 548 | error (_("Unable to find dynamic library list.")); |
419b8bfb RC |
549 | return 0; |
550 | } | |
551 | addr = SYMBOL_VALUE_ADDRESS (sym) - 8; | |
552 | } | |
553 | else | |
554 | addr = SYMBOL_VALUE_ADDRESS (sym); | |
555 | ||
556 | read_memory (addr, buf, 4); | |
e17a4113 | 557 | addr = extract_unsigned_integer (buf, 4, byte_order); |
419b8bfb | 558 | if (addr == 0) |
7fc4b1a1 | 559 | return 0; |
419b8bfb RC |
560 | |
561 | read_memory (addr, buf, 4); | |
e17a4113 | 562 | return extract_unsigned_integer (buf, 4, byte_order); |
419b8bfb RC |
563 | } |
564 | ||
565 | /* Does this so's name match the main binary? */ | |
566 | static int | |
567 | match_main (const char *name) | |
568 | { | |
569 | return strcmp (name, symfile_objfile->name) == 0; | |
570 | } | |
571 | ||
572 | static struct so_list * | |
573 | som_current_sos (void) | |
574 | { | |
e17a4113 | 575 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
419b8bfb RC |
576 | CORE_ADDR lm; |
577 | struct so_list *head = 0; | |
578 | struct so_list **link_ptr = &head; | |
579 | ||
580 | for (lm = link_map_start (); lm; ) | |
581 | { | |
582 | char *namebuf; | |
583 | CORE_ADDR addr; | |
584 | struct so_list *new; | |
585 | struct cleanup *old_chain; | |
586 | int errcode; | |
587 | struct dld_list dbuf; | |
588 | char tsdbuf[4]; | |
589 | ||
590 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
591 | old_chain = make_cleanup (xfree, new); | |
592 | ||
593 | memset (new, 0, sizeof (*new)); | |
594 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
595 | make_cleanup (xfree, new->lm_info); | |
596 | ||
fbdbf38b | 597 | read_memory (lm, (gdb_byte *)&dbuf, sizeof (struct dld_list)); |
419b8bfb | 598 | |
fbdbf38b | 599 | addr = extract_unsigned_integer ((gdb_byte *)&dbuf.name, |
e17a4113 | 600 | sizeof (dbuf.name), byte_order); |
419b8bfb RC |
601 | target_read_string (addr, &namebuf, SO_NAME_MAX_PATH_SIZE - 1, &errcode); |
602 | if (errcode != 0) | |
8a3fe4f8 AC |
603 | warning (_("Can't read pathname for load map: %s."), |
604 | safe_strerror (errcode)); | |
419b8bfb RC |
605 | else |
606 | { | |
607 | strncpy (new->so_name, namebuf, SO_NAME_MAX_PATH_SIZE - 1); | |
608 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
609 | xfree (namebuf); | |
610 | strcpy (new->so_original_name, new->so_name); | |
611 | } | |
612 | ||
613 | if (new->so_name[0] && !match_main (new->so_name)) | |
614 | { | |
615 | struct lm_info *lmi = new->lm_info; | |
616 | unsigned int tmp; | |
617 | ||
618 | lmi->lm_addr = lm; | |
619 | ||
620 | #define EXTRACT(_fld) \ | |
e17a4113 UW |
621 | extract_unsigned_integer ((gdb_byte *)&dbuf._fld, \ |
622 | sizeof (dbuf._fld), byte_order); | |
419b8bfb RC |
623 | |
624 | lmi->text_addr = EXTRACT (text_addr); | |
625 | tmp = EXTRACT (info); | |
626 | lmi->library_version = (tmp >> 16) & 0xffff; | |
627 | lmi->bind_mode = (tmp >> 8) & 0xff; | |
628 | lmi->struct_version = tmp & 0xff; | |
629 | lmi->text_link_addr = EXTRACT (text_link_addr); | |
630 | lmi->text_end = EXTRACT (text_end); | |
631 | lmi->data_start = EXTRACT (data_start); | |
632 | lmi->bss_start = EXTRACT (bss_start); | |
633 | lmi->data_end = EXTRACT (data_end); | |
634 | lmi->got_value = EXTRACT (got_value); | |
635 | tmp = EXTRACT (tsd_start_addr_ptr); | |
636 | read_memory (tmp, tsdbuf, 4); | |
e17a4113 UW |
637 | lmi->tsd_start_addr |
638 | = extract_unsigned_integer (tsdbuf, 4, byte_order); | |
419b8bfb RC |
639 | |
640 | #ifdef SOLIB_SOM_DBG | |
5af949e3 UW |
641 | printf ("\n+ library \"%s\" is described at %s\n", new->so_name, |
642 | paddress (target_gdbarch, lm)); | |
419b8bfb RC |
643 | printf (" 'version' is %d\n", new->lm_info->struct_version); |
644 | printf (" 'bind_mode' is %d\n", new->lm_info->bind_mode); | |
645 | printf (" 'library_version' is %d\n", | |
646 | new->lm_info->library_version); | |
5af949e3 UW |
647 | printf (" 'text_addr' is %s\n", |
648 | paddress (target_gdbarch, new->lm_info->text_addr)); | |
649 | printf (" 'text_link_addr' is %s\n", | |
650 | paddress (target_gdbarch, new->lm_info->text_link_addr)); | |
651 | printf (" 'text_end' is %s\n", | |
652 | paddress (target_gdbarch, new->lm_info->text_end)); | |
653 | printf (" 'data_start' is %s\n", | |
654 | paddress (target_gdbarch, new->lm_info->data_start)); | |
655 | printf (" 'bss_start' is %s\n", | |
656 | paddress (target_gdbarch, new->lm_info->bss_start)); | |
657 | printf (" 'data_end' is %s\n", | |
658 | paddress (target_gdbarch, new->lm_info->data_end)); | |
659 | printf (" 'got_value' is %s\n", | |
660 | paddress (target_gdbarch, new->lm_info->got_value)); | |
661 | printf (" 'tsd_start_addr' is %s\n", | |
662 | paddress (target_gdbarch, new->lm_info->tsd_start_addr)); | |
419b8bfb RC |
663 | #endif |
664 | ||
cfa9d6d9 DJ |
665 | new->addr_low = lmi->text_addr; |
666 | new->addr_high = lmi->text_end; | |
667 | ||
419b8bfb RC |
668 | /* Link the new object onto the list. */ |
669 | new->next = NULL; | |
670 | *link_ptr = new; | |
671 | link_ptr = &new->next; | |
672 | } | |
673 | else | |
674 | { | |
675 | free_so (new); | |
676 | } | |
677 | ||
678 | lm = EXTRACT (next); | |
679 | discard_cleanups (old_chain); | |
680 | #undef EXTRACT | |
681 | } | |
682 | ||
683 | /* TODO: The original somsolib code has logic to detect and eliminate | |
684 | duplicate entries. Do we need that? */ | |
685 | ||
686 | return head; | |
687 | } | |
688 | ||
689 | static int | |
690 | som_open_symbol_file_object (void *from_ttyp) | |
691 | { | |
e17a4113 | 692 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
419b8bfb RC |
693 | CORE_ADDR lm, l_name; |
694 | char *filename; | |
695 | int errcode; | |
696 | int from_tty = *(int *)from_ttyp; | |
697 | char buf[4]; | |
698 | ||
699 | if (symfile_objfile) | |
9e2f0ad4 | 700 | if (!query (_("Attempt to reload symbols from process? "))) |
419b8bfb RC |
701 | return 0; |
702 | ||
703 | /* First link map member should be the executable. */ | |
704 | if ((lm = link_map_start ()) == 0) | |
705 | return 0; /* failed somehow... */ | |
706 | ||
707 | /* Read address of name from target memory to GDB. */ | |
708 | read_memory (lm + offsetof (struct dld_list, name), buf, 4); | |
709 | ||
710 | /* Convert the address to host format. Assume that the address is | |
711 | unsigned. */ | |
e17a4113 | 712 | l_name = extract_unsigned_integer (buf, 4, byte_order); |
419b8bfb RC |
713 | |
714 | if (l_name == 0) | |
715 | return 0; /* No filename. */ | |
716 | ||
717 | /* Now fetch the filename from target memory. */ | |
718 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
719 | ||
720 | if (errcode) | |
721 | { | |
8a3fe4f8 | 722 | warning (_("failed to read exec filename from attached file: %s"), |
419b8bfb RC |
723 | safe_strerror (errcode)); |
724 | return 0; | |
725 | } | |
726 | ||
727 | make_cleanup (xfree, filename); | |
728 | /* Have a pathname: read the symbol file. */ | |
729 | symbol_file_add_main (filename, from_tty); | |
730 | ||
731 | return 1; | |
732 | } | |
733 | ||
734 | static void | |
735 | som_free_so (struct so_list *so) | |
736 | { | |
737 | xfree (so->lm_info); | |
738 | } | |
739 | ||
740 | static CORE_ADDR | |
741 | som_solib_thread_start_addr (struct so_list *so) | |
742 | { | |
743 | return so->lm_info->tsd_start_addr; | |
744 | } | |
745 | ||
746 | /* Return the GOT value for the shared library in which ADDR belongs. If | |
747 | ADDR isn't in any known shared library, return zero. */ | |
748 | ||
749 | static CORE_ADDR | |
750 | som_solib_get_got_by_pc (CORE_ADDR addr) | |
751 | { | |
752 | struct so_list *so_list = master_so_list (); | |
753 | CORE_ADDR got_value = 0; | |
754 | ||
755 | while (so_list) | |
756 | { | |
757 | if (so_list->lm_info->text_addr <= addr | |
758 | && so_list->lm_info->text_end > addr) | |
759 | { | |
760 | got_value = so_list->lm_info->got_value; | |
761 | break; | |
762 | } | |
763 | so_list = so_list->next; | |
764 | } | |
765 | return got_value; | |
766 | } | |
767 | ||
3e43a32a MS |
768 | /* Return the address of the handle of the shared library in which |
769 | ADDR belongs. If ADDR isn't in any known shared library, return | |
770 | zero. */ | |
419b8bfb RC |
771 | /* this function is used in initialize_hp_cxx_exception_support in |
772 | hppa-hpux-tdep.c */ | |
773 | ||
774 | static CORE_ADDR | |
775 | som_solib_get_solib_by_pc (CORE_ADDR addr) | |
776 | { | |
777 | struct so_list *so_list = master_so_list (); | |
778 | ||
779 | while (so_list) | |
780 | { | |
781 | if (so_list->lm_info->text_addr <= addr | |
782 | && so_list->lm_info->text_end > addr) | |
783 | { | |
784 | break; | |
785 | } | |
786 | so_list = so_list->next; | |
787 | } | |
788 | if (so_list) | |
789 | return so_list->lm_info->lm_addr; | |
790 | else | |
791 | return 0; | |
792 | } | |
793 | ||
794 | ||
795 | static struct target_so_ops som_so_ops; | |
796 | ||
797 | extern initialize_file_ftype _initialize_som_solib; /* -Wmissing-prototypes */ | |
798 | ||
799 | void | |
800 | _initialize_som_solib (void) | |
801 | { | |
802 | som_so_ops.relocate_section_addresses = som_relocate_section_addresses; | |
803 | som_so_ops.free_so = som_free_so; | |
804 | som_so_ops.clear_solib = som_clear_solib; | |
805 | som_so_ops.solib_create_inferior_hook = som_solib_create_inferior_hook; | |
806 | som_so_ops.special_symbol_handling = som_special_symbol_handling; | |
807 | som_so_ops.current_sos = som_current_sos; | |
808 | som_so_ops.open_symbol_file_object = som_open_symbol_file_object; | |
809 | som_so_ops.in_dynsym_resolve_code = som_in_dynsym_resolve_code; | |
831a0c44 | 810 | som_so_ops.bfd_open = solib_bfd_open; |
419b8bfb RC |
811 | } |
812 | ||
63807e1d PA |
813 | void |
814 | som_solib_select (struct gdbarch *gdbarch) | |
419b8bfb | 815 | { |
d542061a | 816 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
419b8bfb | 817 | |
433759f7 | 818 | set_solib_ops (gdbarch, &som_so_ops); |
419b8bfb RC |
819 | tdep->solib_thread_start_addr = som_solib_thread_start_addr; |
820 | tdep->solib_get_got_by_pc = som_solib_get_got_by_pc; | |
821 | tdep->solib_get_solib_by_pc = som_solib_get_solib_by_pc; | |
822 | } | |
823 | ||
824 | /* The rest of these functions are not part of the solib interface; they | |
825 | are used by somread.c or hppa-hpux-tdep.c */ | |
826 | ||
827 | int | |
828 | som_solib_section_offsets (struct objfile *objfile, | |
829 | struct section_offsets *offsets) | |
830 | { | |
831 | struct so_list *so_list = master_so_list (); | |
832 | ||
833 | while (so_list) | |
834 | { | |
835 | /* Oh what a pain! We need the offsets before so_list->objfile | |
836 | is valid. The BFDs will never match. Make a best guess. */ | |
837 | if (strstr (objfile->name, so_list->so_name)) | |
838 | { | |
839 | asection *private_section; | |
840 | ||
841 | /* The text offset is easy. */ | |
842 | offsets->offsets[SECT_OFF_TEXT (objfile)] | |
843 | = (so_list->lm_info->text_addr | |
844 | - so_list->lm_info->text_link_addr); | |
845 | offsets->offsets[SECT_OFF_RODATA (objfile)] | |
846 | = ANOFFSET (offsets, SECT_OFF_TEXT (objfile)); | |
847 | ||
848 | /* We should look at presumed_dp in the SOM header, but | |
849 | that's not easily available. This should be OK though. */ | |
850 | private_section = bfd_get_section_by_name (objfile->obfd, | |
851 | "$PRIVATE$"); | |
852 | if (!private_section) | |
853 | { | |
8a3fe4f8 | 854 | warning (_("Unable to find $PRIVATE$ in shared library!")); |
419b8bfb RC |
855 | offsets->offsets[SECT_OFF_DATA (objfile)] = 0; |
856 | offsets->offsets[SECT_OFF_BSS (objfile)] = 0; | |
857 | return 1; | |
858 | } | |
859 | offsets->offsets[SECT_OFF_DATA (objfile)] | |
860 | = (so_list->lm_info->data_start - private_section->vma); | |
861 | offsets->offsets[SECT_OFF_BSS (objfile)] | |
862 | = ANOFFSET (offsets, SECT_OFF_DATA (objfile)); | |
863 | return 1; | |
864 | } | |
865 | so_list = so_list->next; | |
866 | } | |
867 | return 0; | |
868 | } |