]>
Commit | Line | Data |
---|---|---|
ab31aa69 | 1 | /* Handle SVR4 shared libraries for GDB, the GNU Debugger. |
2f4950cd | 2 | |
6aba47ca | 3 | Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, |
4c38e0a4 | 4 | 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
0fb0cc75 | 5 | Free Software Foundation, Inc. |
13437d4b KB |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
13437d4b KB |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
13437d4b | 21 | |
13437d4b KB |
22 | #include "defs.h" |
23 | ||
13437d4b | 24 | #include "elf/external.h" |
21479ded | 25 | #include "elf/common.h" |
f7856c8f | 26 | #include "elf/mips.h" |
13437d4b KB |
27 | |
28 | #include "symtab.h" | |
29 | #include "bfd.h" | |
30 | #include "symfile.h" | |
31 | #include "objfiles.h" | |
32 | #include "gdbcore.h" | |
13437d4b | 33 | #include "target.h" |
13437d4b | 34 | #include "inferior.h" |
fb14de7b | 35 | #include "regcache.h" |
2020b7ab | 36 | #include "gdbthread.h" |
1a816a87 | 37 | #include "observer.h" |
13437d4b | 38 | |
4b188b9f MK |
39 | #include "gdb_assert.h" |
40 | ||
13437d4b | 41 | #include "solist.h" |
bba93f6c | 42 | #include "solib.h" |
13437d4b KB |
43 | #include "solib-svr4.h" |
44 | ||
2f4950cd | 45 | #include "bfd-target.h" |
cc10cae3 | 46 | #include "elf-bfd.h" |
2f4950cd | 47 | #include "exec.h" |
8d4e36ba | 48 | #include "auxv.h" |
f1838a98 | 49 | #include "exceptions.h" |
2f4950cd | 50 | |
e5e2b9ff | 51 | static struct link_map_offsets *svr4_fetch_link_map_offsets (void); |
d5a921c9 | 52 | static int svr4_have_link_map_offsets (void); |
9f2982ff | 53 | static void svr4_relocate_main_executable (void); |
1c4dcb57 | 54 | |
13437d4b KB |
55 | /* Link map info to include in an allocated so_list entry */ |
56 | ||
57 | struct lm_info | |
58 | { | |
59 | /* Pointer to copy of link map from inferior. The type is char * | |
60 | rather than void *, so that we may use byte offsets to find the | |
61 | various fields without the need for a cast. */ | |
4066fc10 | 62 | gdb_byte *lm; |
cc10cae3 AO |
63 | |
64 | /* Amount by which addresses in the binary should be relocated to | |
65 | match the inferior. This could most often be taken directly | |
66 | from lm, but when prelinking is involved and the prelink base | |
67 | address changes, we may need a different offset, we want to | |
68 | warn about the difference and compute it only once. */ | |
69 | CORE_ADDR l_addr; | |
93a57060 DJ |
70 | |
71 | /* The target location of lm. */ | |
72 | CORE_ADDR lm_addr; | |
13437d4b KB |
73 | }; |
74 | ||
75 | /* On SVR4 systems, a list of symbols in the dynamic linker where | |
76 | GDB can try to place a breakpoint to monitor shared library | |
77 | events. | |
78 | ||
79 | If none of these symbols are found, or other errors occur, then | |
80 | SVR4 systems will fall back to using a symbol as the "startup | |
81 | mapping complete" breakpoint address. */ | |
82 | ||
13437d4b KB |
83 | static char *solib_break_names[] = |
84 | { | |
85 | "r_debug_state", | |
86 | "_r_debug_state", | |
87 | "_dl_debug_state", | |
88 | "rtld_db_dlactivity", | |
4c7dcb84 | 89 | "__dl_rtld_db_dlactivity", |
1f72e589 | 90 | "_rtld_debug_state", |
4c0122c8 | 91 | |
13437d4b KB |
92 | NULL |
93 | }; | |
13437d4b | 94 | |
13437d4b KB |
95 | static char *bkpt_names[] = |
96 | { | |
13437d4b | 97 | "_start", |
ad3dcc5c | 98 | "__start", |
13437d4b KB |
99 | "main", |
100 | NULL | |
101 | }; | |
13437d4b | 102 | |
13437d4b KB |
103 | static char *main_name_list[] = |
104 | { | |
105 | "main_$main", | |
106 | NULL | |
107 | }; | |
108 | ||
4d7b2d5b JB |
109 | /* Return non-zero if GDB_SO_NAME and INFERIOR_SO_NAME represent |
110 | the same shared library. */ | |
111 | ||
112 | static int | |
113 | svr4_same_1 (const char *gdb_so_name, const char *inferior_so_name) | |
114 | { | |
115 | if (strcmp (gdb_so_name, inferior_so_name) == 0) | |
116 | return 1; | |
117 | ||
118 | /* On Solaris, when starting inferior we think that dynamic linker is | |
119 | /usr/lib/ld.so.1, but later on, the table of loaded shared libraries | |
120 | contains /lib/ld.so.1. Sometimes one file is a link to another, but | |
121 | sometimes they have identical content, but are not linked to each | |
122 | other. We don't restrict this check for Solaris, but the chances | |
123 | of running into this situation elsewhere are very low. */ | |
124 | if (strcmp (gdb_so_name, "/usr/lib/ld.so.1") == 0 | |
125 | && strcmp (inferior_so_name, "/lib/ld.so.1") == 0) | |
126 | return 1; | |
127 | ||
128 | /* Similarly, we observed the same issue with sparc64, but with | |
129 | different locations. */ | |
130 | if (strcmp (gdb_so_name, "/usr/lib/sparcv9/ld.so.1") == 0 | |
131 | && strcmp (inferior_so_name, "/lib/sparcv9/ld.so.1") == 0) | |
132 | return 1; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int | |
138 | svr4_same (struct so_list *gdb, struct so_list *inferior) | |
139 | { | |
140 | return (svr4_same_1 (gdb->so_original_name, inferior->so_original_name)); | |
141 | } | |
142 | ||
13437d4b KB |
143 | /* link map access functions */ |
144 | ||
145 | static CORE_ADDR | |
cc10cae3 | 146 | LM_ADDR_FROM_LINK_MAP (struct so_list *so) |
13437d4b | 147 | { |
4b188b9f | 148 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 149 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 150 | |
cfaefc65 | 151 | return extract_typed_address (so->lm_info->lm + lmo->l_addr_offset, |
b6da22b0 | 152 | ptr_type); |
13437d4b KB |
153 | } |
154 | ||
cc10cae3 | 155 | static int |
2c0b251b | 156 | HAS_LM_DYNAMIC_FROM_LINK_MAP (void) |
cc10cae3 AO |
157 | { |
158 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
159 | ||
cfaefc65 | 160 | return lmo->l_ld_offset >= 0; |
cc10cae3 AO |
161 | } |
162 | ||
163 | static CORE_ADDR | |
164 | LM_DYNAMIC_FROM_LINK_MAP (struct so_list *so) | |
165 | { | |
166 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 167 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
cc10cae3 | 168 | |
cfaefc65 | 169 | return extract_typed_address (so->lm_info->lm + lmo->l_ld_offset, |
b6da22b0 | 170 | ptr_type); |
cc10cae3 AO |
171 | } |
172 | ||
173 | static CORE_ADDR | |
174 | LM_ADDR_CHECK (struct so_list *so, bfd *abfd) | |
175 | { | |
176 | if (so->lm_info->l_addr == (CORE_ADDR)-1) | |
177 | { | |
178 | struct bfd_section *dyninfo_sect; | |
179 | CORE_ADDR l_addr, l_dynaddr, dynaddr, align = 0x1000; | |
180 | ||
181 | l_addr = LM_ADDR_FROM_LINK_MAP (so); | |
182 | ||
183 | if (! abfd || ! HAS_LM_DYNAMIC_FROM_LINK_MAP ()) | |
184 | goto set_addr; | |
185 | ||
186 | l_dynaddr = LM_DYNAMIC_FROM_LINK_MAP (so); | |
187 | ||
188 | dyninfo_sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
189 | if (dyninfo_sect == NULL) | |
190 | goto set_addr; | |
191 | ||
192 | dynaddr = bfd_section_vma (abfd, dyninfo_sect); | |
193 | ||
194 | if (dynaddr + l_addr != l_dynaddr) | |
195 | { | |
cc10cae3 AO |
196 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
197 | { | |
198 | Elf_Internal_Ehdr *ehdr = elf_tdata (abfd)->elf_header; | |
199 | Elf_Internal_Phdr *phdr = elf_tdata (abfd)->phdr; | |
200 | int i; | |
201 | ||
202 | align = 1; | |
203 | ||
204 | for (i = 0; i < ehdr->e_phnum; i++) | |
205 | if (phdr[i].p_type == PT_LOAD && phdr[i].p_align > align) | |
206 | align = phdr[i].p_align; | |
207 | } | |
208 | ||
209 | /* Turn it into a mask. */ | |
210 | align--; | |
211 | ||
212 | /* If the changes match the alignment requirements, we | |
213 | assume we're using a core file that was generated by the | |
214 | same binary, just prelinked with a different base offset. | |
215 | If it doesn't match, we may have a different binary, the | |
216 | same binary with the dynamic table loaded at an unrelated | |
217 | location, or anything, really. To avoid regressions, | |
218 | don't adjust the base offset in the latter case, although | |
219 | odds are that, if things really changed, debugging won't | |
5c0d192f JK |
220 | quite work. |
221 | ||
222 | One could expect more the condition | |
223 | ((l_addr & align) == 0 && ((l_dynaddr - dynaddr) & align) == 0) | |
224 | but the one below is relaxed for PPC. The PPC kernel supports | |
225 | either 4k or 64k page sizes. To be prepared for 64k pages, | |
226 | PPC ELF files are built using an alignment requirement of 64k. | |
227 | However, when running on a kernel supporting 4k pages, the memory | |
228 | mapping of the library may not actually happen on a 64k boundary! | |
229 | ||
230 | (In the usual case where (l_addr & align) == 0, this check is | |
231 | equivalent to the possibly expected check above.) */ | |
232 | ||
f1e55806 | 233 | if ((l_addr & align) == ((l_dynaddr - dynaddr) & align)) |
cc10cae3 AO |
234 | { |
235 | l_addr = l_dynaddr - dynaddr; | |
79d4c408 DJ |
236 | |
237 | warning (_(".dynamic section for \"%s\" " | |
238 | "is not at the expected address"), so->so_name); | |
cc10cae3 AO |
239 | warning (_("difference appears to be caused by prelink, " |
240 | "adjusting expectations")); | |
241 | } | |
79d4c408 DJ |
242 | else |
243 | warning (_(".dynamic section for \"%s\" " | |
244 | "is not at the expected address " | |
245 | "(wrong library or version mismatch?)"), so->so_name); | |
cc10cae3 AO |
246 | } |
247 | ||
248 | set_addr: | |
249 | so->lm_info->l_addr = l_addr; | |
250 | } | |
251 | ||
252 | return so->lm_info->l_addr; | |
253 | } | |
254 | ||
13437d4b KB |
255 | static CORE_ADDR |
256 | LM_NEXT (struct so_list *so) | |
257 | { | |
4b188b9f | 258 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 259 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 260 | |
cfaefc65 | 261 | return extract_typed_address (so->lm_info->lm + lmo->l_next_offset, |
b6da22b0 | 262 | ptr_type); |
13437d4b KB |
263 | } |
264 | ||
265 | static CORE_ADDR | |
266 | LM_NAME (struct so_list *so) | |
267 | { | |
4b188b9f | 268 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 269 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 270 | |
cfaefc65 | 271 | return extract_typed_address (so->lm_info->lm + lmo->l_name_offset, |
b6da22b0 | 272 | ptr_type); |
13437d4b KB |
273 | } |
274 | ||
13437d4b KB |
275 | static int |
276 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
277 | { | |
4b188b9f | 278 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 279 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 280 | |
e499d0f1 DJ |
281 | /* Assume that everything is a library if the dynamic loader was loaded |
282 | late by a static executable. */ | |
0763ab81 | 283 | if (exec_bfd && bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL) |
e499d0f1 DJ |
284 | return 0; |
285 | ||
cfaefc65 | 286 | return extract_typed_address (so->lm_info->lm + lmo->l_prev_offset, |
b6da22b0 | 287 | ptr_type) == 0; |
13437d4b KB |
288 | } |
289 | ||
6c95b8df | 290 | /* Per pspace SVR4 specific data. */ |
13437d4b | 291 | |
1a816a87 PA |
292 | struct svr4_info |
293 | { | |
1a816a87 PA |
294 | CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
295 | ||
296 | /* Validity flag for debug_loader_offset. */ | |
297 | int debug_loader_offset_p; | |
298 | ||
299 | /* Load address for the dynamic linker, inferred. */ | |
300 | CORE_ADDR debug_loader_offset; | |
301 | ||
302 | /* Name of the dynamic linker, valid if debug_loader_offset_p. */ | |
303 | char *debug_loader_name; | |
304 | ||
305 | /* Load map address for the main executable. */ | |
306 | CORE_ADDR main_lm_addr; | |
1a816a87 | 307 | |
6c95b8df PA |
308 | CORE_ADDR interp_text_sect_low; |
309 | CORE_ADDR interp_text_sect_high; | |
310 | CORE_ADDR interp_plt_sect_low; | |
311 | CORE_ADDR interp_plt_sect_high; | |
312 | }; | |
1a816a87 | 313 | |
6c95b8df PA |
314 | /* Per-program-space data key. */ |
315 | static const struct program_space_data *solib_svr4_pspace_data; | |
1a816a87 | 316 | |
6c95b8df PA |
317 | static void |
318 | svr4_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
1a816a87 | 319 | { |
6c95b8df | 320 | struct svr4_info *info; |
1a816a87 | 321 | |
6c95b8df PA |
322 | info = program_space_data (pspace, solib_svr4_pspace_data); |
323 | xfree (info); | |
1a816a87 PA |
324 | } |
325 | ||
6c95b8df PA |
326 | /* Get the current svr4 data. If none is found yet, add it now. This |
327 | function always returns a valid object. */ | |
34439770 | 328 | |
6c95b8df PA |
329 | static struct svr4_info * |
330 | get_svr4_info (void) | |
1a816a87 | 331 | { |
6c95b8df | 332 | struct svr4_info *info; |
1a816a87 | 333 | |
6c95b8df PA |
334 | info = program_space_data (current_program_space, solib_svr4_pspace_data); |
335 | if (info != NULL) | |
336 | return info; | |
34439770 | 337 | |
6c95b8df PA |
338 | info = XZALLOC (struct svr4_info); |
339 | set_program_space_data (current_program_space, solib_svr4_pspace_data, info); | |
340 | return info; | |
1a816a87 | 341 | } |
93a57060 | 342 | |
13437d4b KB |
343 | /* Local function prototypes */ |
344 | ||
345 | static int match_main (char *); | |
346 | ||
2bbe3cc1 | 347 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *); |
13437d4b KB |
348 | |
349 | /* | |
350 | ||
351 | LOCAL FUNCTION | |
352 | ||
353 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
354 | ||
355 | SYNOPSIS | |
356 | ||
2bbe3cc1 | 357 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) |
13437d4b KB |
358 | |
359 | DESCRIPTION | |
360 | ||
361 | An expensive way to lookup the value of a single symbol for | |
362 | bfd's that are only temporary anyway. This is used by the | |
363 | shared library support to find the address of the debugger | |
2bbe3cc1 | 364 | notification routine in the shared library. |
13437d4b | 365 | |
2bbe3cc1 DJ |
366 | The returned symbol may be in a code or data section; functions |
367 | will normally be in a code section, but may be in a data section | |
368 | if this architecture uses function descriptors. | |
87f84c9d | 369 | |
13437d4b KB |
370 | Note that 0 is specifically allowed as an error return (no |
371 | such symbol). | |
372 | */ | |
373 | ||
374 | static CORE_ADDR | |
2bbe3cc1 | 375 | bfd_lookup_symbol (bfd *abfd, char *symname) |
13437d4b | 376 | { |
435b259c | 377 | long storage_needed; |
13437d4b KB |
378 | asymbol *sym; |
379 | asymbol **symbol_table; | |
380 | unsigned int number_of_symbols; | |
381 | unsigned int i; | |
382 | struct cleanup *back_to; | |
383 | CORE_ADDR symaddr = 0; | |
384 | ||
385 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
386 | ||
387 | if (storage_needed > 0) | |
388 | { | |
389 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 390 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
391 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
392 | ||
393 | for (i = 0; i < number_of_symbols; i++) | |
394 | { | |
395 | sym = *symbol_table++; | |
6314a349 | 396 | if (strcmp (sym->name, symname) == 0 |
2bbe3cc1 | 397 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) |
13437d4b | 398 | { |
2bbe3cc1 | 399 | /* BFD symbols are section relative. */ |
13437d4b KB |
400 | symaddr = sym->value + sym->section->vma; |
401 | break; | |
402 | } | |
403 | } | |
404 | do_cleanups (back_to); | |
405 | } | |
406 | ||
407 | if (symaddr) | |
408 | return symaddr; | |
409 | ||
410 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll | |
411 | have to check the dynamic string table too. */ | |
412 | ||
413 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
414 | ||
415 | if (storage_needed > 0) | |
416 | { | |
417 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 418 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
419 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table); |
420 | ||
421 | for (i = 0; i < number_of_symbols; i++) | |
422 | { | |
423 | sym = *symbol_table++; | |
87f84c9d | 424 | |
6314a349 | 425 | if (strcmp (sym->name, symname) == 0 |
2bbe3cc1 | 426 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) |
13437d4b | 427 | { |
2bbe3cc1 | 428 | /* BFD symbols are section relative. */ |
13437d4b KB |
429 | symaddr = sym->value + sym->section->vma; |
430 | break; | |
431 | } | |
432 | } | |
433 | do_cleanups (back_to); | |
434 | } | |
435 | ||
436 | return symaddr; | |
437 | } | |
438 | ||
97ec2c2f UW |
439 | |
440 | /* Read program header TYPE from inferior memory. The header is found | |
441 | by scanning the OS auxillary vector. | |
442 | ||
443 | Return a pointer to allocated memory holding the program header contents, | |
444 | or NULL on failure. If sucessful, and unless P_SECT_SIZE is NULL, the | |
445 | size of those contents is returned to P_SECT_SIZE. Likewise, the target | |
446 | architecture size (32-bit or 64-bit) is returned to P_ARCH_SIZE. */ | |
447 | ||
448 | static gdb_byte * | |
449 | read_program_header (int type, int *p_sect_size, int *p_arch_size) | |
450 | { | |
e17a4113 | 451 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
97ec2c2f UW |
452 | CORE_ADDR at_phdr, at_phent, at_phnum; |
453 | int arch_size, sect_size; | |
454 | CORE_ADDR sect_addr; | |
455 | gdb_byte *buf; | |
456 | ||
457 | /* Get required auxv elements from target. */ | |
458 | if (target_auxv_search (¤t_target, AT_PHDR, &at_phdr) <= 0) | |
459 | return 0; | |
460 | if (target_auxv_search (¤t_target, AT_PHENT, &at_phent) <= 0) | |
461 | return 0; | |
462 | if (target_auxv_search (¤t_target, AT_PHNUM, &at_phnum) <= 0) | |
463 | return 0; | |
464 | if (!at_phdr || !at_phnum) | |
465 | return 0; | |
466 | ||
467 | /* Determine ELF architecture type. */ | |
468 | if (at_phent == sizeof (Elf32_External_Phdr)) | |
469 | arch_size = 32; | |
470 | else if (at_phent == sizeof (Elf64_External_Phdr)) | |
471 | arch_size = 64; | |
472 | else | |
473 | return 0; | |
474 | ||
475 | /* Find .dynamic section via the PT_DYNAMIC PHDR. */ | |
476 | if (arch_size == 32) | |
477 | { | |
478 | Elf32_External_Phdr phdr; | |
479 | int i; | |
480 | ||
481 | /* Search for requested PHDR. */ | |
482 | for (i = 0; i < at_phnum; i++) | |
483 | { | |
484 | if (target_read_memory (at_phdr + i * sizeof (phdr), | |
485 | (gdb_byte *)&phdr, sizeof (phdr))) | |
486 | return 0; | |
487 | ||
e17a4113 UW |
488 | if (extract_unsigned_integer ((gdb_byte *)phdr.p_type, |
489 | 4, byte_order) == type) | |
97ec2c2f UW |
490 | break; |
491 | } | |
492 | ||
493 | if (i == at_phnum) | |
494 | return 0; | |
495 | ||
496 | /* Retrieve address and size. */ | |
e17a4113 UW |
497 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
498 | 4, byte_order); | |
499 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
500 | 4, byte_order); | |
97ec2c2f UW |
501 | } |
502 | else | |
503 | { | |
504 | Elf64_External_Phdr phdr; | |
505 | int i; | |
506 | ||
507 | /* Search for requested PHDR. */ | |
508 | for (i = 0; i < at_phnum; i++) | |
509 | { | |
510 | if (target_read_memory (at_phdr + i * sizeof (phdr), | |
511 | (gdb_byte *)&phdr, sizeof (phdr))) | |
512 | return 0; | |
513 | ||
e17a4113 UW |
514 | if (extract_unsigned_integer ((gdb_byte *)phdr.p_type, |
515 | 4, byte_order) == type) | |
97ec2c2f UW |
516 | break; |
517 | } | |
518 | ||
519 | if (i == at_phnum) | |
520 | return 0; | |
521 | ||
522 | /* Retrieve address and size. */ | |
e17a4113 UW |
523 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
524 | 8, byte_order); | |
525 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
526 | 8, byte_order); | |
97ec2c2f UW |
527 | } |
528 | ||
529 | /* Read in requested program header. */ | |
530 | buf = xmalloc (sect_size); | |
531 | if (target_read_memory (sect_addr, buf, sect_size)) | |
532 | { | |
533 | xfree (buf); | |
534 | return NULL; | |
535 | } | |
536 | ||
537 | if (p_arch_size) | |
538 | *p_arch_size = arch_size; | |
539 | if (p_sect_size) | |
540 | *p_sect_size = sect_size; | |
541 | ||
542 | return buf; | |
543 | } | |
544 | ||
545 | ||
546 | /* Return program interpreter string. */ | |
547 | static gdb_byte * | |
548 | find_program_interpreter (void) | |
549 | { | |
550 | gdb_byte *buf = NULL; | |
551 | ||
552 | /* If we have an exec_bfd, use its section table. */ | |
553 | if (exec_bfd | |
554 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
555 | { | |
556 | struct bfd_section *interp_sect; | |
557 | ||
558 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
559 | if (interp_sect != NULL) | |
560 | { | |
561 | CORE_ADDR sect_addr = bfd_section_vma (exec_bfd, interp_sect); | |
562 | int sect_size = bfd_section_size (exec_bfd, interp_sect); | |
563 | ||
564 | buf = xmalloc (sect_size); | |
565 | bfd_get_section_contents (exec_bfd, interp_sect, buf, 0, sect_size); | |
566 | } | |
567 | } | |
568 | ||
569 | /* If we didn't find it, use the target auxillary vector. */ | |
570 | if (!buf) | |
571 | buf = read_program_header (PT_INTERP, NULL, NULL); | |
572 | ||
573 | return buf; | |
574 | } | |
575 | ||
576 | ||
3a40aaa0 UW |
577 | /* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is |
578 | returned and the corresponding PTR is set. */ | |
579 | ||
580 | static int | |
581 | scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr) | |
582 | { | |
583 | int arch_size, step, sect_size; | |
584 | long dyn_tag; | |
b381ea14 | 585 | CORE_ADDR dyn_ptr, dyn_addr; |
65728c26 | 586 | gdb_byte *bufend, *bufstart, *buf; |
3a40aaa0 UW |
587 | Elf32_External_Dyn *x_dynp_32; |
588 | Elf64_External_Dyn *x_dynp_64; | |
589 | struct bfd_section *sect; | |
61f0d762 | 590 | struct target_section *target_section; |
3a40aaa0 UW |
591 | |
592 | if (abfd == NULL) | |
593 | return 0; | |
0763ab81 PA |
594 | |
595 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
596 | return 0; | |
597 | ||
3a40aaa0 UW |
598 | arch_size = bfd_get_arch_size (abfd); |
599 | if (arch_size == -1) | |
0763ab81 | 600 | return 0; |
3a40aaa0 UW |
601 | |
602 | /* Find the start address of the .dynamic section. */ | |
603 | sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
604 | if (sect == NULL) | |
605 | return 0; | |
61f0d762 JK |
606 | |
607 | for (target_section = current_target_sections->sections; | |
608 | target_section < current_target_sections->sections_end; | |
609 | target_section++) | |
610 | if (sect == target_section->the_bfd_section) | |
611 | break; | |
b381ea14 JK |
612 | if (target_section < current_target_sections->sections_end) |
613 | dyn_addr = target_section->addr; | |
614 | else | |
615 | { | |
616 | /* ABFD may come from OBJFILE acting only as a symbol file without being | |
617 | loaded into the target (see add_symbol_file_command). This case is | |
618 | such fallback to the file VMA address without the possibility of | |
619 | having the section relocated to its actual in-memory address. */ | |
620 | ||
621 | dyn_addr = bfd_section_vma (abfd, sect); | |
622 | } | |
3a40aaa0 | 623 | |
65728c26 DJ |
624 | /* Read in .dynamic from the BFD. We will get the actual value |
625 | from memory later. */ | |
3a40aaa0 | 626 | sect_size = bfd_section_size (abfd, sect); |
65728c26 DJ |
627 | buf = bufstart = alloca (sect_size); |
628 | if (!bfd_get_section_contents (abfd, sect, | |
629 | buf, 0, sect_size)) | |
630 | return 0; | |
3a40aaa0 UW |
631 | |
632 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
633 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
634 | : sizeof (Elf64_External_Dyn); | |
635 | for (bufend = buf + sect_size; | |
636 | buf < bufend; | |
637 | buf += step) | |
638 | { | |
639 | if (arch_size == 32) | |
640 | { | |
641 | x_dynp_32 = (Elf32_External_Dyn *) buf; | |
642 | dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag); | |
643 | dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr); | |
644 | } | |
65728c26 | 645 | else |
3a40aaa0 UW |
646 | { |
647 | x_dynp_64 = (Elf64_External_Dyn *) buf; | |
648 | dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag); | |
649 | dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr); | |
650 | } | |
651 | if (dyn_tag == DT_NULL) | |
652 | return 0; | |
653 | if (dyn_tag == dyntag) | |
654 | { | |
65728c26 DJ |
655 | /* If requested, try to read the runtime value of this .dynamic |
656 | entry. */ | |
3a40aaa0 | 657 | if (ptr) |
65728c26 | 658 | { |
b6da22b0 | 659 | struct type *ptr_type; |
65728c26 DJ |
660 | gdb_byte ptr_buf[8]; |
661 | CORE_ADDR ptr_addr; | |
662 | ||
b6da22b0 | 663 | ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
b381ea14 | 664 | ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8; |
65728c26 | 665 | if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0) |
b6da22b0 | 666 | dyn_ptr = extract_typed_address (ptr_buf, ptr_type); |
65728c26 DJ |
667 | *ptr = dyn_ptr; |
668 | } | |
669 | return 1; | |
3a40aaa0 UW |
670 | } |
671 | } | |
672 | ||
673 | return 0; | |
674 | } | |
675 | ||
97ec2c2f UW |
676 | /* Scan for DYNTAG in .dynamic section of the target's main executable, |
677 | found by consulting the OS auxillary vector. If DYNTAG is found 1 is | |
678 | returned and the corresponding PTR is set. */ | |
679 | ||
680 | static int | |
681 | scan_dyntag_auxv (int dyntag, CORE_ADDR *ptr) | |
682 | { | |
e17a4113 | 683 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
97ec2c2f UW |
684 | int sect_size, arch_size, step; |
685 | long dyn_tag; | |
686 | CORE_ADDR dyn_ptr; | |
687 | gdb_byte *bufend, *bufstart, *buf; | |
688 | ||
689 | /* Read in .dynamic section. */ | |
690 | buf = bufstart = read_program_header (PT_DYNAMIC, §_size, &arch_size); | |
691 | if (!buf) | |
692 | return 0; | |
693 | ||
694 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
695 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
696 | : sizeof (Elf64_External_Dyn); | |
697 | for (bufend = buf + sect_size; | |
698 | buf < bufend; | |
699 | buf += step) | |
700 | { | |
701 | if (arch_size == 32) | |
702 | { | |
703 | Elf32_External_Dyn *dynp = (Elf32_External_Dyn *) buf; | |
e17a4113 UW |
704 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
705 | 4, byte_order); | |
706 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
707 | 4, byte_order); | |
97ec2c2f UW |
708 | } |
709 | else | |
710 | { | |
711 | Elf64_External_Dyn *dynp = (Elf64_External_Dyn *) buf; | |
e17a4113 UW |
712 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
713 | 8, byte_order); | |
714 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
715 | 8, byte_order); | |
97ec2c2f UW |
716 | } |
717 | if (dyn_tag == DT_NULL) | |
718 | break; | |
719 | ||
720 | if (dyn_tag == dyntag) | |
721 | { | |
722 | if (ptr) | |
723 | *ptr = dyn_ptr; | |
724 | ||
725 | xfree (bufstart); | |
726 | return 1; | |
727 | } | |
728 | } | |
729 | ||
730 | xfree (bufstart); | |
731 | return 0; | |
732 | } | |
733 | ||
3a40aaa0 | 734 | |
13437d4b KB |
735 | /* |
736 | ||
737 | LOCAL FUNCTION | |
738 | ||
739 | elf_locate_base -- locate the base address of dynamic linker structs | |
740 | for SVR4 elf targets. | |
741 | ||
742 | SYNOPSIS | |
743 | ||
744 | CORE_ADDR elf_locate_base (void) | |
745 | ||
746 | DESCRIPTION | |
747 | ||
748 | For SVR4 elf targets the address of the dynamic linker's runtime | |
749 | structure is contained within the dynamic info section in the | |
750 | executable file. The dynamic section is also mapped into the | |
751 | inferior address space. Because the runtime loader fills in the | |
752 | real address before starting the inferior, we have to read in the | |
753 | dynamic info section from the inferior address space. | |
754 | If there are any errors while trying to find the address, we | |
755 | silently return 0, otherwise the found address is returned. | |
756 | ||
757 | */ | |
758 | ||
759 | static CORE_ADDR | |
760 | elf_locate_base (void) | |
761 | { | |
3a40aaa0 UW |
762 | struct minimal_symbol *msymbol; |
763 | CORE_ADDR dyn_ptr; | |
13437d4b | 764 | |
65728c26 DJ |
765 | /* Look for DT_MIPS_RLD_MAP first. MIPS executables use this |
766 | instead of DT_DEBUG, although they sometimes contain an unused | |
767 | DT_DEBUG. */ | |
97ec2c2f UW |
768 | if (scan_dyntag (DT_MIPS_RLD_MAP, exec_bfd, &dyn_ptr) |
769 | || scan_dyntag_auxv (DT_MIPS_RLD_MAP, &dyn_ptr)) | |
3a40aaa0 | 770 | { |
b6da22b0 | 771 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
3a40aaa0 | 772 | gdb_byte *pbuf; |
b6da22b0 | 773 | int pbuf_size = TYPE_LENGTH (ptr_type); |
3a40aaa0 UW |
774 | pbuf = alloca (pbuf_size); |
775 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
776 | of the dynamic link structure. */ | |
777 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) | |
e499d0f1 | 778 | return 0; |
b6da22b0 | 779 | return extract_typed_address (pbuf, ptr_type); |
e499d0f1 DJ |
780 | } |
781 | ||
65728c26 | 782 | /* Find DT_DEBUG. */ |
97ec2c2f UW |
783 | if (scan_dyntag (DT_DEBUG, exec_bfd, &dyn_ptr) |
784 | || scan_dyntag_auxv (DT_DEBUG, &dyn_ptr)) | |
65728c26 DJ |
785 | return dyn_ptr; |
786 | ||
3a40aaa0 UW |
787 | /* This may be a static executable. Look for the symbol |
788 | conventionally named _r_debug, as a last resort. */ | |
789 | msymbol = lookup_minimal_symbol ("_r_debug", NULL, symfile_objfile); | |
790 | if (msymbol != NULL) | |
791 | return SYMBOL_VALUE_ADDRESS (msymbol); | |
13437d4b KB |
792 | |
793 | /* DT_DEBUG entry not found. */ | |
794 | return 0; | |
795 | } | |
796 | ||
13437d4b KB |
797 | /* |
798 | ||
799 | LOCAL FUNCTION | |
800 | ||
801 | locate_base -- locate the base address of dynamic linker structs | |
802 | ||
803 | SYNOPSIS | |
804 | ||
1a816a87 | 805 | CORE_ADDR locate_base (struct svr4_info *) |
13437d4b KB |
806 | |
807 | DESCRIPTION | |
808 | ||
809 | For both the SunOS and SVR4 shared library implementations, if the | |
810 | inferior executable has been linked dynamically, there is a single | |
811 | address somewhere in the inferior's data space which is the key to | |
812 | locating all of the dynamic linker's runtime structures. This | |
813 | address is the value of the debug base symbol. The job of this | |
814 | function is to find and return that address, or to return 0 if there | |
815 | is no such address (the executable is statically linked for example). | |
816 | ||
817 | For SunOS, the job is almost trivial, since the dynamic linker and | |
818 | all of it's structures are statically linked to the executable at | |
819 | link time. Thus the symbol for the address we are looking for has | |
820 | already been added to the minimal symbol table for the executable's | |
821 | objfile at the time the symbol file's symbols were read, and all we | |
822 | have to do is look it up there. Note that we explicitly do NOT want | |
823 | to find the copies in the shared library. | |
824 | ||
825 | The SVR4 version is a bit more complicated because the address | |
826 | is contained somewhere in the dynamic info section. We have to go | |
827 | to a lot more work to discover the address of the debug base symbol. | |
828 | Because of this complexity, we cache the value we find and return that | |
829 | value on subsequent invocations. Note there is no copy in the | |
830 | executable symbol tables. | |
831 | ||
832 | */ | |
833 | ||
834 | static CORE_ADDR | |
1a816a87 | 835 | locate_base (struct svr4_info *info) |
13437d4b | 836 | { |
13437d4b KB |
837 | /* Check to see if we have a currently valid address, and if so, avoid |
838 | doing all this work again and just return the cached address. If | |
839 | we have no cached address, try to locate it in the dynamic info | |
d5a921c9 KB |
840 | section for ELF executables. There's no point in doing any of this |
841 | though if we don't have some link map offsets to work with. */ | |
13437d4b | 842 | |
1a816a87 | 843 | if (info->debug_base == 0 && svr4_have_link_map_offsets ()) |
0763ab81 | 844 | info->debug_base = elf_locate_base (); |
1a816a87 | 845 | return info->debug_base; |
13437d4b KB |
846 | } |
847 | ||
e4cd0d6a MK |
848 | /* Find the first element in the inferior's dynamic link map, and |
849 | return its address in the inferior. | |
13437d4b | 850 | |
e4cd0d6a MK |
851 | FIXME: Perhaps we should validate the info somehow, perhaps by |
852 | checking r_version for a known version number, or r_state for | |
853 | RT_CONSISTENT. */ | |
13437d4b KB |
854 | |
855 | static CORE_ADDR | |
1a816a87 | 856 | solib_svr4_r_map (struct svr4_info *info) |
13437d4b | 857 | { |
4b188b9f | 858 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 859 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 860 | |
1a816a87 PA |
861 | return read_memory_typed_address (info->debug_base + lmo->r_map_offset, |
862 | ptr_type); | |
e4cd0d6a | 863 | } |
13437d4b | 864 | |
7cd25cfc DJ |
865 | /* Find r_brk from the inferior's debug base. */ |
866 | ||
867 | static CORE_ADDR | |
1a816a87 | 868 | solib_svr4_r_brk (struct svr4_info *info) |
7cd25cfc DJ |
869 | { |
870 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 871 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
7cd25cfc | 872 | |
1a816a87 PA |
873 | return read_memory_typed_address (info->debug_base + lmo->r_brk_offset, |
874 | ptr_type); | |
7cd25cfc DJ |
875 | } |
876 | ||
e4cd0d6a MK |
877 | /* Find the link map for the dynamic linker (if it is not in the |
878 | normal list of loaded shared objects). */ | |
13437d4b | 879 | |
e4cd0d6a | 880 | static CORE_ADDR |
1a816a87 | 881 | solib_svr4_r_ldsomap (struct svr4_info *info) |
e4cd0d6a MK |
882 | { |
883 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 884 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
e17a4113 | 885 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
e4cd0d6a | 886 | ULONGEST version; |
13437d4b | 887 | |
e4cd0d6a MK |
888 | /* Check version, and return zero if `struct r_debug' doesn't have |
889 | the r_ldsomap member. */ | |
1a816a87 PA |
890 | version |
891 | = read_memory_unsigned_integer (info->debug_base + lmo->r_version_offset, | |
e17a4113 | 892 | lmo->r_version_size, byte_order); |
e4cd0d6a MK |
893 | if (version < 2 || lmo->r_ldsomap_offset == -1) |
894 | return 0; | |
13437d4b | 895 | |
1a816a87 | 896 | return read_memory_typed_address (info->debug_base + lmo->r_ldsomap_offset, |
b6da22b0 | 897 | ptr_type); |
13437d4b KB |
898 | } |
899 | ||
de18c1d8 JM |
900 | /* On Solaris systems with some versions of the dynamic linker, |
901 | ld.so's l_name pointer points to the SONAME in the string table | |
902 | rather than into writable memory. So that GDB can find shared | |
903 | libraries when loading a core file generated by gcore, ensure that | |
904 | memory areas containing the l_name string are saved in the core | |
905 | file. */ | |
906 | ||
907 | static int | |
908 | svr4_keep_data_in_core (CORE_ADDR vaddr, unsigned long size) | |
909 | { | |
910 | struct svr4_info *info; | |
911 | CORE_ADDR ldsomap; | |
912 | struct so_list *new; | |
913 | struct cleanup *old_chain; | |
914 | struct link_map_offsets *lmo; | |
915 | CORE_ADDR lm_name; | |
916 | ||
917 | info = get_svr4_info (); | |
918 | ||
919 | info->debug_base = 0; | |
920 | locate_base (info); | |
921 | if (!info->debug_base) | |
922 | return 0; | |
923 | ||
924 | ldsomap = solib_svr4_r_ldsomap (info); | |
925 | if (!ldsomap) | |
926 | return 0; | |
927 | ||
928 | lmo = svr4_fetch_link_map_offsets (); | |
929 | new = XZALLOC (struct so_list); | |
930 | old_chain = make_cleanup (xfree, new); | |
931 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
932 | make_cleanup (xfree, new->lm_info); | |
933 | new->lm_info->l_addr = (CORE_ADDR)-1; | |
934 | new->lm_info->lm_addr = ldsomap; | |
935 | new->lm_info->lm = xzalloc (lmo->link_map_size); | |
936 | make_cleanup (xfree, new->lm_info->lm); | |
937 | read_memory (ldsomap, new->lm_info->lm, lmo->link_map_size); | |
938 | lm_name = LM_NAME (new); | |
939 | do_cleanups (old_chain); | |
940 | ||
941 | return (lm_name >= vaddr && lm_name < vaddr + size); | |
942 | } | |
943 | ||
13437d4b KB |
944 | /* |
945 | ||
946 | LOCAL FUNCTION | |
947 | ||
948 | open_symbol_file_object | |
949 | ||
950 | SYNOPSIS | |
951 | ||
952 | void open_symbol_file_object (void *from_tty) | |
953 | ||
954 | DESCRIPTION | |
955 | ||
956 | If no open symbol file, attempt to locate and open the main symbol | |
957 | file. On SVR4 systems, this is the first link map entry. If its | |
958 | name is here, we can open it. Useful when attaching to a process | |
959 | without first loading its symbol file. | |
960 | ||
961 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |
962 | be printed. This parameter is a pointer rather than an int because | |
963 | open_symbol_file_object() is called via catch_errors() and | |
964 | catch_errors() requires a pointer argument. */ | |
965 | ||
966 | static int | |
967 | open_symbol_file_object (void *from_ttyp) | |
968 | { | |
969 | CORE_ADDR lm, l_name; | |
970 | char *filename; | |
971 | int errcode; | |
972 | int from_tty = *(int *)from_ttyp; | |
4b188b9f | 973 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 UW |
974 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
975 | int l_name_size = TYPE_LENGTH (ptr_type); | |
cfaefc65 | 976 | gdb_byte *l_name_buf = xmalloc (l_name_size); |
b8c9b27d | 977 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); |
6c95b8df | 978 | struct svr4_info *info = get_svr4_info (); |
13437d4b KB |
979 | |
980 | if (symfile_objfile) | |
9e2f0ad4 | 981 | if (!query (_("Attempt to reload symbols from process? "))) |
13437d4b KB |
982 | return 0; |
983 | ||
7cd25cfc | 984 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
985 | info->debug_base = 0; |
986 | if (locate_base (info) == 0) | |
13437d4b KB |
987 | return 0; /* failed somehow... */ |
988 | ||
989 | /* First link map member should be the executable. */ | |
1a816a87 | 990 | lm = solib_svr4_r_map (info); |
e4cd0d6a | 991 | if (lm == 0) |
13437d4b KB |
992 | return 0; /* failed somehow... */ |
993 | ||
994 | /* Read address of name from target memory to GDB. */ | |
cfaefc65 | 995 | read_memory (lm + lmo->l_name_offset, l_name_buf, l_name_size); |
13437d4b | 996 | |
cfaefc65 | 997 | /* Convert the address to host format. */ |
b6da22b0 | 998 | l_name = extract_typed_address (l_name_buf, ptr_type); |
13437d4b KB |
999 | |
1000 | /* Free l_name_buf. */ | |
1001 | do_cleanups (cleanups); | |
1002 | ||
1003 | if (l_name == 0) | |
1004 | return 0; /* No filename. */ | |
1005 | ||
1006 | /* Now fetch the filename from target memory. */ | |
1007 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
ea5bf0a1 | 1008 | make_cleanup (xfree, filename); |
13437d4b KB |
1009 | |
1010 | if (errcode) | |
1011 | { | |
8a3fe4f8 | 1012 | warning (_("failed to read exec filename from attached file: %s"), |
13437d4b KB |
1013 | safe_strerror (errcode)); |
1014 | return 0; | |
1015 | } | |
1016 | ||
13437d4b | 1017 | /* Have a pathname: read the symbol file. */ |
1adeb98a | 1018 | symbol_file_add_main (filename, from_tty); |
13437d4b KB |
1019 | |
1020 | return 1; | |
1021 | } | |
13437d4b | 1022 | |
34439770 DJ |
1023 | /* If no shared library information is available from the dynamic |
1024 | linker, build a fallback list from other sources. */ | |
1025 | ||
1026 | static struct so_list * | |
1027 | svr4_default_sos (void) | |
1028 | { | |
6c95b8df | 1029 | struct svr4_info *info = get_svr4_info (); |
1a816a87 | 1030 | |
34439770 DJ |
1031 | struct so_list *head = NULL; |
1032 | struct so_list **link_ptr = &head; | |
1033 | ||
1a816a87 | 1034 | if (info->debug_loader_offset_p) |
34439770 DJ |
1035 | { |
1036 | struct so_list *new = XZALLOC (struct so_list); | |
1037 | ||
1038 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
1039 | ||
1040 | /* Nothing will ever check the cached copy of the link | |
1041 | map if we set l_addr. */ | |
1a816a87 | 1042 | new->lm_info->l_addr = info->debug_loader_offset; |
93a57060 | 1043 | new->lm_info->lm_addr = 0; |
34439770 DJ |
1044 | new->lm_info->lm = NULL; |
1045 | ||
1a816a87 PA |
1046 | strncpy (new->so_name, info->debug_loader_name, |
1047 | SO_NAME_MAX_PATH_SIZE - 1); | |
34439770 DJ |
1048 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
1049 | strcpy (new->so_original_name, new->so_name); | |
1050 | ||
1051 | *link_ptr = new; | |
1052 | link_ptr = &new->next; | |
1053 | } | |
1054 | ||
1055 | return head; | |
1056 | } | |
1057 | ||
13437d4b KB |
1058 | /* LOCAL FUNCTION |
1059 | ||
1060 | current_sos -- build a list of currently loaded shared objects | |
1061 | ||
1062 | SYNOPSIS | |
1063 | ||
1064 | struct so_list *current_sos () | |
1065 | ||
1066 | DESCRIPTION | |
1067 | ||
1068 | Build a list of `struct so_list' objects describing the shared | |
1069 | objects currently loaded in the inferior. This list does not | |
1070 | include an entry for the main executable file. | |
1071 | ||
1072 | Note that we only gather information directly available from the | |
1073 | inferior --- we don't examine any of the shared library files | |
1074 | themselves. The declaration of `struct so_list' says which fields | |
1075 | we provide values for. */ | |
1076 | ||
1077 | static struct so_list * | |
1078 | svr4_current_sos (void) | |
1079 | { | |
1080 | CORE_ADDR lm; | |
1081 | struct so_list *head = 0; | |
1082 | struct so_list **link_ptr = &head; | |
e4cd0d6a | 1083 | CORE_ADDR ldsomap = 0; |
1a816a87 PA |
1084 | struct svr4_info *info; |
1085 | ||
6c95b8df | 1086 | info = get_svr4_info (); |
13437d4b | 1087 | |
7cd25cfc | 1088 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
1089 | info->debug_base = 0; |
1090 | locate_base (info); | |
13437d4b | 1091 | |
7cd25cfc DJ |
1092 | /* If we can't find the dynamic linker's base structure, this |
1093 | must not be a dynamically linked executable. Hmm. */ | |
1a816a87 | 1094 | if (! info->debug_base) |
7cd25cfc | 1095 | return svr4_default_sos (); |
13437d4b KB |
1096 | |
1097 | /* Walk the inferior's link map list, and build our list of | |
1098 | `struct so_list' nodes. */ | |
1a816a87 | 1099 | lm = solib_svr4_r_map (info); |
34439770 | 1100 | |
13437d4b KB |
1101 | while (lm) |
1102 | { | |
4b188b9f | 1103 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f4456994 | 1104 | struct so_list *new = XZALLOC (struct so_list); |
b8c9b27d | 1105 | struct cleanup *old_chain = make_cleanup (xfree, new); |
13437d4b | 1106 | |
13437d4b | 1107 | new->lm_info = xmalloc (sizeof (struct lm_info)); |
b8c9b27d | 1108 | make_cleanup (xfree, new->lm_info); |
13437d4b | 1109 | |
831004b7 | 1110 | new->lm_info->l_addr = (CORE_ADDR)-1; |
93a57060 | 1111 | new->lm_info->lm_addr = lm; |
f4456994 | 1112 | new->lm_info->lm = xzalloc (lmo->link_map_size); |
b8c9b27d | 1113 | make_cleanup (xfree, new->lm_info->lm); |
13437d4b KB |
1114 | |
1115 | read_memory (lm, new->lm_info->lm, lmo->link_map_size); | |
1116 | ||
1117 | lm = LM_NEXT (new); | |
1118 | ||
1119 | /* For SVR4 versions, the first entry in the link map is for the | |
1120 | inferior executable, so we must ignore it. For some versions of | |
1121 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1122 | does have a name, so we can no longer use a missing name to | |
1123 | decide when to ignore it. */ | |
e4cd0d6a | 1124 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new) && ldsomap == 0) |
93a57060 | 1125 | { |
1a816a87 | 1126 | info->main_lm_addr = new->lm_info->lm_addr; |
93a57060 DJ |
1127 | free_so (new); |
1128 | } | |
13437d4b KB |
1129 | else |
1130 | { | |
1131 | int errcode; | |
1132 | char *buffer; | |
1133 | ||
1134 | /* Extract this shared object's name. */ | |
1135 | target_read_string (LM_NAME (new), &buffer, | |
1136 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
1137 | if (errcode != 0) | |
8a3fe4f8 AC |
1138 | warning (_("Can't read pathname for load map: %s."), |
1139 | safe_strerror (errcode)); | |
13437d4b KB |
1140 | else |
1141 | { | |
1142 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); | |
1143 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
13437d4b KB |
1144 | strcpy (new->so_original_name, new->so_name); |
1145 | } | |
ea5bf0a1 | 1146 | xfree (buffer); |
13437d4b KB |
1147 | |
1148 | /* If this entry has no name, or its name matches the name | |
1149 | for the main executable, don't include it in the list. */ | |
1150 | if (! new->so_name[0] | |
1151 | || match_main (new->so_name)) | |
1152 | free_so (new); | |
1153 | else | |
1154 | { | |
1155 | new->next = 0; | |
1156 | *link_ptr = new; | |
1157 | link_ptr = &new->next; | |
1158 | } | |
1159 | } | |
1160 | ||
e4cd0d6a MK |
1161 | /* On Solaris, the dynamic linker is not in the normal list of |
1162 | shared objects, so make sure we pick it up too. Having | |
1163 | symbol information for the dynamic linker is quite crucial | |
1164 | for skipping dynamic linker resolver code. */ | |
1165 | if (lm == 0 && ldsomap == 0) | |
1a816a87 | 1166 | lm = ldsomap = solib_svr4_r_ldsomap (info); |
e4cd0d6a | 1167 | |
13437d4b KB |
1168 | discard_cleanups (old_chain); |
1169 | } | |
1170 | ||
34439770 DJ |
1171 | if (head == NULL) |
1172 | return svr4_default_sos (); | |
1173 | ||
13437d4b KB |
1174 | return head; |
1175 | } | |
1176 | ||
93a57060 | 1177 | /* Get the address of the link_map for a given OBJFILE. */ |
bc4a16ae EZ |
1178 | |
1179 | CORE_ADDR | |
1180 | svr4_fetch_objfile_link_map (struct objfile *objfile) | |
1181 | { | |
93a57060 | 1182 | struct so_list *so; |
6c95b8df | 1183 | struct svr4_info *info = get_svr4_info (); |
bc4a16ae | 1184 | |
93a57060 | 1185 | /* Cause svr4_current_sos() to be run if it hasn't been already. */ |
1a816a87 | 1186 | if (info->main_lm_addr == 0) |
93a57060 | 1187 | solib_add (NULL, 0, ¤t_target, auto_solib_add); |
bc4a16ae | 1188 | |
93a57060 DJ |
1189 | /* svr4_current_sos() will set main_lm_addr for the main executable. */ |
1190 | if (objfile == symfile_objfile) | |
1a816a87 | 1191 | return info->main_lm_addr; |
93a57060 DJ |
1192 | |
1193 | /* The other link map addresses may be found by examining the list | |
1194 | of shared libraries. */ | |
1195 | for (so = master_so_list (); so; so = so->next) | |
1196 | if (so->objfile == objfile) | |
1197 | return so->lm_info->lm_addr; | |
1198 | ||
1199 | /* Not found! */ | |
bc4a16ae EZ |
1200 | return 0; |
1201 | } | |
13437d4b KB |
1202 | |
1203 | /* On some systems, the only way to recognize the link map entry for | |
1204 | the main executable file is by looking at its name. Return | |
1205 | non-zero iff SONAME matches one of the known main executable names. */ | |
1206 | ||
1207 | static int | |
1208 | match_main (char *soname) | |
1209 | { | |
1210 | char **mainp; | |
1211 | ||
1212 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
1213 | { | |
1214 | if (strcmp (soname, *mainp) == 0) | |
1215 | return (1); | |
1216 | } | |
1217 | ||
1218 | return (0); | |
1219 | } | |
1220 | ||
13437d4b KB |
1221 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
1222 | SVR4 run time loader. */ | |
13437d4b | 1223 | |
7d522c90 | 1224 | int |
d7fa2ae2 | 1225 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) |
13437d4b | 1226 | { |
6c95b8df PA |
1227 | struct svr4_info *info = get_svr4_info (); |
1228 | ||
1229 | return ((pc >= info->interp_text_sect_low | |
1230 | && pc < info->interp_text_sect_high) | |
1231 | || (pc >= info->interp_plt_sect_low | |
1232 | && pc < info->interp_plt_sect_high) | |
13437d4b KB |
1233 | || in_plt_section (pc, NULL)); |
1234 | } | |
13437d4b | 1235 | |
2f4950cd AC |
1236 | /* Given an executable's ABFD and target, compute the entry-point |
1237 | address. */ | |
1238 | ||
1239 | static CORE_ADDR | |
1240 | exec_entry_point (struct bfd *abfd, struct target_ops *targ) | |
1241 | { | |
1242 | /* KevinB wrote ... for most targets, the address returned by | |
1243 | bfd_get_start_address() is the entry point for the start | |
1244 | function. But, for some targets, bfd_get_start_address() returns | |
1245 | the address of a function descriptor from which the entry point | |
1246 | address may be extracted. This address is extracted by | |
1247 | gdbarch_convert_from_func_ptr_addr(). The method | |
1248 | gdbarch_convert_from_func_ptr_addr() is the merely the identify | |
1249 | function for targets which don't use function descriptors. */ | |
1cf3db46 | 1250 | return gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
2f4950cd AC |
1251 | bfd_get_start_address (abfd), |
1252 | targ); | |
1253 | } | |
13437d4b KB |
1254 | |
1255 | /* | |
1256 | ||
1257 | LOCAL FUNCTION | |
1258 | ||
1259 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1260 | ||
1261 | SYNOPSIS | |
1262 | ||
1263 | int enable_break (void) | |
1264 | ||
1265 | DESCRIPTION | |
1266 | ||
1267 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1268 | debugger interface, support for arranging for the inferior to hit | |
1269 | a breakpoint after mapping in the shared libraries. This function | |
1270 | enables that breakpoint. | |
1271 | ||
1272 | For SunOS, there is a special flag location (in_debugger) which we | |
1273 | set to 1. When the dynamic linker sees this flag set, it will set | |
1274 | a breakpoint at a location known only to itself, after saving the | |
1275 | original contents of that place and the breakpoint address itself, | |
1276 | in it's own internal structures. When we resume the inferior, it | |
1277 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1278 | We handle this (in a different place) by restoring the contents of | |
1279 | the breakpointed location (which is only known after it stops), | |
1280 | chasing around to locate the shared libraries that have been | |
1281 | loaded, then resuming. | |
1282 | ||
1283 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1284 | which is statically initialized at the time the shared library is | |
1285 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1286 | teed to be called once before mapping in a library, and again when | |
1287 | the mapping is complete. At the time we are examining this member, | |
1288 | it contains only the unrelocated offset of the function, so we have | |
1289 | to do our own relocation. Later, when the dynamic linker actually | |
1290 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1291 | ||
1292 | The debugger interface structure also contains an enumeration which | |
1293 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1294 | depending upon whether or not the library is being mapped or unmapped, | |
1295 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1296 | */ | |
1297 | ||
1298 | static int | |
268a4a75 | 1299 | enable_break (struct svr4_info *info, int from_tty) |
13437d4b | 1300 | { |
13437d4b KB |
1301 | struct minimal_symbol *msymbol; |
1302 | char **bkpt_namep; | |
1303 | asection *interp_sect; | |
97ec2c2f | 1304 | gdb_byte *interp_name; |
7cd25cfc | 1305 | CORE_ADDR sym_addr; |
13437d4b KB |
1306 | |
1307 | /* First, remove all the solib event breakpoints. Their addresses | |
1308 | may have changed since the last time we ran the program. */ | |
1309 | remove_solib_event_breakpoints (); | |
1310 | ||
6c95b8df PA |
1311 | info->interp_text_sect_low = info->interp_text_sect_high = 0; |
1312 | info->interp_plt_sect_low = info->interp_plt_sect_high = 0; | |
13437d4b | 1313 | |
7cd25cfc DJ |
1314 | /* If we already have a shared library list in the target, and |
1315 | r_debug contains r_brk, set the breakpoint there - this should | |
1316 | mean r_brk has already been relocated. Assume the dynamic linker | |
1317 | is the object containing r_brk. */ | |
1318 | ||
268a4a75 | 1319 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
7cd25cfc | 1320 | sym_addr = 0; |
1a816a87 PA |
1321 | if (info->debug_base && solib_svr4_r_map (info) != 0) |
1322 | sym_addr = solib_svr4_r_brk (info); | |
7cd25cfc DJ |
1323 | |
1324 | if (sym_addr != 0) | |
1325 | { | |
1326 | struct obj_section *os; | |
1327 | ||
b36ec657 | 1328 | sym_addr = gdbarch_addr_bits_remove |
1cf3db46 | 1329 | (target_gdbarch, gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
b36ec657 DJ |
1330 | sym_addr, |
1331 | ¤t_target)); | |
1332 | ||
48379de6 DE |
1333 | /* On at least some versions of Solaris there's a dynamic relocation |
1334 | on _r_debug.r_brk and SYM_ADDR may not be relocated yet, e.g., if | |
1335 | we get control before the dynamic linker has self-relocated. | |
1336 | Check if SYM_ADDR is in a known section, if it is assume we can | |
1337 | trust its value. This is just a heuristic though, it could go away | |
1338 | or be replaced if it's getting in the way. | |
1339 | ||
1340 | On ARM we need to know whether the ISA of rtld_db_dlactivity (or | |
1341 | however it's spelled in your particular system) is ARM or Thumb. | |
1342 | That knowledge is encoded in the address, if it's Thumb the low bit | |
1343 | is 1. However, we've stripped that info above and it's not clear | |
1344 | what all the consequences are of passing a non-addr_bits_remove'd | |
1345 | address to create_solib_event_breakpoint. The call to | |
1346 | find_pc_section verifies we know about the address and have some | |
1347 | hope of computing the right kind of breakpoint to use (via | |
1348 | symbol info). It does mean that GDB needs to be pointed at a | |
1349 | non-stripped version of the dynamic linker in order to obtain | |
1350 | information it already knows about. Sigh. */ | |
1351 | ||
7cd25cfc DJ |
1352 | os = find_pc_section (sym_addr); |
1353 | if (os != NULL) | |
1354 | { | |
1355 | /* Record the relocated start and end address of the dynamic linker | |
1356 | text and plt section for svr4_in_dynsym_resolve_code. */ | |
1357 | bfd *tmp_bfd; | |
1358 | CORE_ADDR load_addr; | |
1359 | ||
1360 | tmp_bfd = os->objfile->obfd; | |
1361 | load_addr = ANOFFSET (os->objfile->section_offsets, | |
1362 | os->objfile->sect_index_text); | |
1363 | ||
1364 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
1365 | if (interp_sect) | |
1366 | { | |
6c95b8df | 1367 | info->interp_text_sect_low = |
7cd25cfc | 1368 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1369 | info->interp_text_sect_high = |
1370 | info->interp_text_sect_low | |
1371 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1372 | } |
1373 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1374 | if (interp_sect) | |
1375 | { | |
6c95b8df | 1376 | info->interp_plt_sect_low = |
7cd25cfc | 1377 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1378 | info->interp_plt_sect_high = |
1379 | info->interp_plt_sect_low | |
1380 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1381 | } |
1382 | ||
a6d9a66e | 1383 | create_solib_event_breakpoint (target_gdbarch, sym_addr); |
7cd25cfc DJ |
1384 | return 1; |
1385 | } | |
1386 | } | |
1387 | ||
97ec2c2f | 1388 | /* Find the program interpreter; if not found, warn the user and drop |
13437d4b | 1389 | into the old breakpoint at symbol code. */ |
97ec2c2f UW |
1390 | interp_name = find_program_interpreter (); |
1391 | if (interp_name) | |
13437d4b | 1392 | { |
8ad2fcde KB |
1393 | CORE_ADDR load_addr = 0; |
1394 | int load_addr_found = 0; | |
2ec9a4f8 | 1395 | int loader_found_in_list = 0; |
f8766ec1 | 1396 | struct so_list *so; |
e4f7b8c8 | 1397 | bfd *tmp_bfd = NULL; |
2f4950cd | 1398 | struct target_ops *tmp_bfd_target; |
f1838a98 | 1399 | volatile struct gdb_exception ex; |
13437d4b | 1400 | |
7cd25cfc | 1401 | sym_addr = 0; |
13437d4b KB |
1402 | |
1403 | /* Now we need to figure out where the dynamic linker was | |
1404 | loaded so that we can load its symbols and place a breakpoint | |
1405 | in the dynamic linker itself. | |
1406 | ||
1407 | This address is stored on the stack. However, I've been unable | |
1408 | to find any magic formula to find it for Solaris (appears to | |
1409 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1410 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 | 1411 | |
f1838a98 UW |
1412 | TRY_CATCH (ex, RETURN_MASK_ALL) |
1413 | { | |
97ec2c2f | 1414 | tmp_bfd = solib_bfd_open (interp_name); |
f1838a98 | 1415 | } |
13437d4b KB |
1416 | if (tmp_bfd == NULL) |
1417 | goto bkpt_at_symbol; | |
1418 | ||
2f4950cd AC |
1419 | /* Now convert the TMP_BFD into a target. That way target, as |
1420 | well as BFD operations can be used. Note that closing the | |
1421 | target will also close the underlying bfd. */ | |
1422 | tmp_bfd_target = target_bfd_reopen (tmp_bfd); | |
1423 | ||
f8766ec1 KB |
1424 | /* On a running target, we can get the dynamic linker's base |
1425 | address from the shared library table. */ | |
f8766ec1 KB |
1426 | so = master_so_list (); |
1427 | while (so) | |
8ad2fcde | 1428 | { |
97ec2c2f | 1429 | if (svr4_same_1 (interp_name, so->so_original_name)) |
8ad2fcde KB |
1430 | { |
1431 | load_addr_found = 1; | |
2ec9a4f8 | 1432 | loader_found_in_list = 1; |
cc10cae3 | 1433 | load_addr = LM_ADDR_CHECK (so, tmp_bfd); |
8ad2fcde KB |
1434 | break; |
1435 | } | |
f8766ec1 | 1436 | so = so->next; |
8ad2fcde KB |
1437 | } |
1438 | ||
8d4e36ba JB |
1439 | /* If we were not able to find the base address of the loader |
1440 | from our so_list, then try using the AT_BASE auxilliary entry. */ | |
1441 | if (!load_addr_found) | |
1442 | if (target_auxv_search (¤t_target, AT_BASE, &load_addr) > 0) | |
1443 | load_addr_found = 1; | |
1444 | ||
8ad2fcde KB |
1445 | /* Otherwise we find the dynamic linker's base address by examining |
1446 | the current pc (which should point at the entry point for the | |
8d4e36ba JB |
1447 | dynamic linker) and subtracting the offset of the entry point. |
1448 | ||
1449 | This is more fragile than the previous approaches, but is a good | |
1450 | fallback method because it has actually been working well in | |
1451 | most cases. */ | |
8ad2fcde | 1452 | if (!load_addr_found) |
fb14de7b | 1453 | { |
c2250ad1 UW |
1454 | struct regcache *regcache |
1455 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch); | |
fb14de7b UW |
1456 | load_addr = (regcache_read_pc (regcache) |
1457 | - exec_entry_point (tmp_bfd, tmp_bfd_target)); | |
1458 | } | |
2ec9a4f8 DJ |
1459 | |
1460 | if (!loader_found_in_list) | |
34439770 | 1461 | { |
1a816a87 PA |
1462 | info->debug_loader_name = xstrdup (interp_name); |
1463 | info->debug_loader_offset_p = 1; | |
1464 | info->debug_loader_offset = load_addr; | |
268a4a75 | 1465 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
34439770 | 1466 | } |
13437d4b KB |
1467 | |
1468 | /* Record the relocated start and end address of the dynamic linker | |
d7fa2ae2 | 1469 | text and plt section for svr4_in_dynsym_resolve_code. */ |
13437d4b KB |
1470 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1471 | if (interp_sect) | |
1472 | { | |
6c95b8df | 1473 | info->interp_text_sect_low = |
13437d4b | 1474 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1475 | info->interp_text_sect_high = |
1476 | info->interp_text_sect_low | |
1477 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1478 | } |
1479 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1480 | if (interp_sect) | |
1481 | { | |
6c95b8df | 1482 | info->interp_plt_sect_low = |
13437d4b | 1483 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1484 | info->interp_plt_sect_high = |
1485 | info->interp_plt_sect_low | |
1486 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1487 | } |
1488 | ||
1489 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1490 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1491 | { | |
2bbe3cc1 | 1492 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); |
13437d4b KB |
1493 | if (sym_addr != 0) |
1494 | break; | |
1495 | } | |
1496 | ||
2bbe3cc1 DJ |
1497 | if (sym_addr != 0) |
1498 | /* Convert 'sym_addr' from a function pointer to an address. | |
1499 | Because we pass tmp_bfd_target instead of the current | |
1500 | target, this will always produce an unrelocated value. */ | |
1cf3db46 | 1501 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
2bbe3cc1 DJ |
1502 | sym_addr, |
1503 | tmp_bfd_target); | |
1504 | ||
2f4950cd AC |
1505 | /* We're done with both the temporary bfd and target. Remember, |
1506 | closing the target closes the underlying bfd. */ | |
1507 | target_close (tmp_bfd_target, 0); | |
13437d4b KB |
1508 | |
1509 | if (sym_addr != 0) | |
1510 | { | |
a6d9a66e | 1511 | create_solib_event_breakpoint (target_gdbarch, load_addr + sym_addr); |
97ec2c2f | 1512 | xfree (interp_name); |
13437d4b KB |
1513 | return 1; |
1514 | } | |
1515 | ||
1516 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1517 | linker. Warn and drop into the old code. */ | |
1518 | bkpt_at_symbol: | |
97ec2c2f | 1519 | xfree (interp_name); |
82d03102 PG |
1520 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
1521 | "GDB will be unable to debug shared library initializers\n" | |
1522 | "and track explicitly loaded dynamic code.")); | |
13437d4b | 1523 | } |
13437d4b | 1524 | |
e499d0f1 DJ |
1525 | /* Scan through the lists of symbols, trying to look up the symbol and |
1526 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1527 | ||
1528 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1529 | { | |
1530 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1531 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1532 | { | |
de64a9ac JM |
1533 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
1534 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, | |
1535 | sym_addr, | |
1536 | ¤t_target); | |
1537 | create_solib_event_breakpoint (target_gdbarch, sym_addr); | |
e499d0f1 DJ |
1538 | return 1; |
1539 | } | |
1540 | } | |
13437d4b | 1541 | |
13437d4b KB |
1542 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) |
1543 | { | |
1544 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1545 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1546 | { | |
de64a9ac JM |
1547 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
1548 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, | |
1549 | sym_addr, | |
1550 | ¤t_target); | |
1551 | create_solib_event_breakpoint (target_gdbarch, sym_addr); | |
13437d4b KB |
1552 | return 1; |
1553 | } | |
1554 | } | |
542c95c2 | 1555 | return 0; |
13437d4b KB |
1556 | } |
1557 | ||
1558 | /* | |
1559 | ||
1560 | LOCAL FUNCTION | |
1561 | ||
1562 | special_symbol_handling -- additional shared library symbol handling | |
1563 | ||
1564 | SYNOPSIS | |
1565 | ||
1566 | void special_symbol_handling () | |
1567 | ||
1568 | DESCRIPTION | |
1569 | ||
1570 | Once the symbols from a shared object have been loaded in the usual | |
1571 | way, we are called to do any system specific symbol handling that | |
1572 | is needed. | |
1573 | ||
ab31aa69 | 1574 | For SunOS4, this consisted of grunging around in the dynamic |
13437d4b KB |
1575 | linkers structures to find symbol definitions for "common" symbols |
1576 | and adding them to the minimal symbol table for the runtime common | |
1577 | objfile. | |
1578 | ||
ab31aa69 KB |
1579 | However, for SVR4, there's nothing to do. |
1580 | ||
13437d4b KB |
1581 | */ |
1582 | ||
1583 | static void | |
1584 | svr4_special_symbol_handling (void) | |
1585 | { | |
9f2982ff | 1586 | svr4_relocate_main_executable (); |
13437d4b KB |
1587 | } |
1588 | ||
b8040f19 JK |
1589 | /* Decide if the objfile needs to be relocated. As indicated above, |
1590 | we will only be here when execution is stopped at the beginning | |
1591 | of the program. Relocation is necessary if the address at which | |
1592 | we are presently stopped differs from the start address stored in | |
1593 | the executable AND there's no interpreter section. The condition | |
1594 | regarding the interpreter section is very important because if | |
1595 | there *is* an interpreter section, execution will begin there | |
1596 | instead. When there is an interpreter section, the start address | |
1597 | is (presumably) used by the interpreter at some point to start | |
1598 | execution of the program. | |
1599 | ||
1600 | If there is an interpreter, it is normal for it to be set to an | |
1601 | arbitrary address at the outset. The job of finding it is | |
1602 | handled in enable_break(). | |
1603 | ||
1604 | So, to summarize, relocations are necessary when there is no | |
1605 | interpreter section and the start address obtained from the | |
1606 | executable is different from the address at which GDB is | |
1607 | currently stopped. | |
e2a44558 | 1608 | |
b8040f19 JK |
1609 | [ The astute reader will note that we also test to make sure that |
1610 | the executable in question has the DYNAMIC flag set. It is my | |
1611 | opinion that this test is unnecessary (undesirable even). It | |
1612 | was added to avoid inadvertent relocation of an executable | |
1613 | whose e_type member in the ELF header is not ET_DYN. There may | |
1614 | be a time in the future when it is desirable to do relocations | |
1615 | on other types of files as well in which case this condition | |
1616 | should either be removed or modified to accomodate the new file | |
1617 | type. (E.g, an ET_EXEC executable which has been built to be | |
1618 | position-independent could safely be relocated by the OS if | |
1619 | desired. It is true that this violates the ABI, but the ABI | |
1620 | has been known to be bent from time to time.) - Kevin, Nov 2000. ] | |
1621 | */ | |
e2a44558 | 1622 | |
b8040f19 JK |
1623 | static CORE_ADDR |
1624 | svr4_static_exec_displacement (void) | |
e2a44558 KB |
1625 | { |
1626 | asection *interp_sect; | |
c2250ad1 UW |
1627 | struct regcache *regcache |
1628 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch); | |
fb14de7b | 1629 | CORE_ADDR pc = regcache_read_pc (regcache); |
e2a44558 | 1630 | |
e2a44558 KB |
1631 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); |
1632 | if (interp_sect == NULL | |
1633 | && (bfd_get_file_flags (exec_bfd) & DYNAMIC) != 0 | |
2f4950cd | 1634 | && (exec_entry_point (exec_bfd, &exec_ops) != pc)) |
b8040f19 JK |
1635 | return pc - exec_entry_point (exec_bfd, &exec_ops); |
1636 | ||
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | /* We relocate all of the sections by the same amount. This | |
1641 | behavior is mandated by recent editions of the System V ABI. | |
1642 | According to the System V Application Binary Interface, | |
1643 | Edition 4.1, page 5-5: | |
1644 | ||
1645 | ... Though the system chooses virtual addresses for | |
1646 | individual processes, it maintains the segments' relative | |
1647 | positions. Because position-independent code uses relative | |
1648 | addressesing between segments, the difference between | |
1649 | virtual addresses in memory must match the difference | |
1650 | between virtual addresses in the file. The difference | |
1651 | between the virtual address of any segment in memory and | |
1652 | the corresponding virtual address in the file is thus a | |
1653 | single constant value for any one executable or shared | |
1654 | object in a given process. This difference is the base | |
1655 | address. One use of the base address is to relocate the | |
1656 | memory image of the program during dynamic linking. | |
1657 | ||
1658 | The same language also appears in Edition 4.0 of the System V | |
1659 | ABI and is left unspecified in some of the earlier editions. */ | |
1660 | ||
1661 | static CORE_ADDR | |
1662 | svr4_exec_displacement (void) | |
1663 | { | |
1664 | int found; | |
41752192 JK |
1665 | /* ENTRY_POINT is a possible function descriptor - before |
1666 | a call to gdbarch_convert_from_func_ptr_addr. */ | |
b8040f19 JK |
1667 | CORE_ADDR entry_point; |
1668 | ||
1669 | if (exec_bfd == NULL) | |
1670 | return 0; | |
1671 | ||
1672 | if (target_auxv_search (¤t_target, AT_ENTRY, &entry_point) == 1) | |
41752192 | 1673 | return entry_point - bfd_get_start_address (exec_bfd); |
b8040f19 JK |
1674 | |
1675 | return svr4_static_exec_displacement (); | |
1676 | } | |
1677 | ||
1678 | /* Relocate the main executable. This function should be called upon | |
1679 | stopping the inferior process at the entry point to the program. | |
1680 | The entry point from BFD is compared to the AT_ENTRY of AUXV and if they are | |
1681 | different, the main executable is relocated by the proper amount. */ | |
1682 | ||
1683 | static void | |
1684 | svr4_relocate_main_executable (void) | |
1685 | { | |
1686 | CORE_ADDR displacement = svr4_exec_displacement (); | |
1687 | ||
1688 | /* Even if DISPLACEMENT is 0 still try to relocate it as this is a new | |
1689 | difference of in-memory vs. in-file addresses and we could already | |
1690 | relocate the executable at this function to improper address before. */ | |
1691 | ||
1692 | if (symfile_objfile) | |
e2a44558 | 1693 | { |
e2a44558 | 1694 | struct section_offsets *new_offsets; |
b8040f19 | 1695 | int i; |
e2a44558 | 1696 | |
b8040f19 JK |
1697 | new_offsets = alloca (symfile_objfile->num_sections |
1698 | * sizeof (*new_offsets)); | |
e2a44558 | 1699 | |
b8040f19 JK |
1700 | for (i = 0; i < symfile_objfile->num_sections; i++) |
1701 | new_offsets->offsets[i] = displacement; | |
e2a44558 | 1702 | |
b8040f19 | 1703 | objfile_relocate (symfile_objfile, new_offsets); |
e2a44558 | 1704 | } |
51bee8e9 JK |
1705 | else if (exec_bfd) |
1706 | { | |
1707 | asection *asect; | |
1708 | ||
1709 | for (asect = exec_bfd->sections; asect != NULL; asect = asect->next) | |
1710 | exec_set_section_address (bfd_get_filename (exec_bfd), asect->index, | |
1711 | (bfd_section_vma (exec_bfd, asect) | |
1712 | + displacement)); | |
1713 | } | |
e2a44558 KB |
1714 | } |
1715 | ||
13437d4b KB |
1716 | /* |
1717 | ||
1718 | GLOBAL FUNCTION | |
1719 | ||
1720 | svr4_solib_create_inferior_hook -- shared library startup support | |
1721 | ||
1722 | SYNOPSIS | |
1723 | ||
268a4a75 | 1724 | void svr4_solib_create_inferior_hook (int from_tty) |
13437d4b KB |
1725 | |
1726 | DESCRIPTION | |
1727 | ||
1728 | When gdb starts up the inferior, it nurses it along (through the | |
1729 | shell) until it is ready to execute it's first instruction. At this | |
1730 | point, this function gets called via expansion of the macro | |
1731 | SOLIB_CREATE_INFERIOR_HOOK. | |
1732 | ||
1733 | For SunOS executables, this first instruction is typically the | |
1734 | one at "_start", or a similar text label, regardless of whether | |
1735 | the executable is statically or dynamically linked. The runtime | |
1736 | startup code takes care of dynamically linking in any shared | |
1737 | libraries, once gdb allows the inferior to continue. | |
1738 | ||
1739 | For SVR4 executables, this first instruction is either the first | |
1740 | instruction in the dynamic linker (for dynamically linked | |
1741 | executables) or the instruction at "start" for statically linked | |
1742 | executables. For dynamically linked executables, the system | |
1743 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1744 | and starts it running. The dynamic linker maps in any needed | |
1745 | shared libraries, maps in the actual user executable, and then | |
1746 | jumps to "start" in the user executable. | |
1747 | ||
1748 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1749 | can arrange to cooperate with the dynamic linker to discover the | |
1750 | names of shared libraries that are dynamically linked, and the | |
1751 | base addresses to which they are linked. | |
1752 | ||
1753 | This function is responsible for discovering those names and | |
1754 | addresses, and saving sufficient information about them to allow | |
1755 | their symbols to be read at a later time. | |
1756 | ||
1757 | FIXME | |
1758 | ||
1759 | Between enable_break() and disable_break(), this code does not | |
1760 | properly handle hitting breakpoints which the user might have | |
1761 | set in the startup code or in the dynamic linker itself. Proper | |
1762 | handling will probably have to wait until the implementation is | |
1763 | changed to use the "breakpoint handler function" method. | |
1764 | ||
1765 | Also, what if child has exit()ed? Must exit loop somehow. | |
1766 | */ | |
1767 | ||
e2a44558 | 1768 | static void |
268a4a75 | 1769 | svr4_solib_create_inferior_hook (int from_tty) |
13437d4b | 1770 | { |
d6b48e9c | 1771 | struct inferior *inf; |
2020b7ab | 1772 | struct thread_info *tp; |
1a816a87 PA |
1773 | struct svr4_info *info; |
1774 | ||
6c95b8df | 1775 | info = get_svr4_info (); |
2020b7ab | 1776 | |
e2a44558 | 1777 | /* Relocate the main executable if necessary. */ |
9f2982ff JK |
1778 | if (current_inferior ()->attach_flag == 0) |
1779 | svr4_relocate_main_executable (); | |
e2a44558 | 1780 | |
d5a921c9 | 1781 | if (!svr4_have_link_map_offsets ()) |
513f5903 | 1782 | return; |
d5a921c9 | 1783 | |
268a4a75 | 1784 | if (!enable_break (info, from_tty)) |
542c95c2 | 1785 | return; |
13437d4b | 1786 | |
ab31aa69 KB |
1787 | #if defined(_SCO_DS) |
1788 | /* SCO needs the loop below, other systems should be using the | |
13437d4b KB |
1789 | special shared library breakpoints and the shared library breakpoint |
1790 | service routine. | |
1791 | ||
1792 | Now run the target. It will eventually hit the breakpoint, at | |
1793 | which point all of the libraries will have been mapped in and we | |
1794 | can go groveling around in the dynamic linker structures to find | |
1795 | out what we need to know about them. */ | |
1796 | ||
d6b48e9c | 1797 | inf = current_inferior (); |
2020b7ab PA |
1798 | tp = inferior_thread (); |
1799 | ||
13437d4b | 1800 | clear_proceed_status (); |
d6b48e9c | 1801 | inf->stop_soon = STOP_QUIETLY; |
2020b7ab | 1802 | tp->stop_signal = TARGET_SIGNAL_0; |
13437d4b KB |
1803 | do |
1804 | { | |
2020b7ab | 1805 | target_resume (pid_to_ptid (-1), 0, tp->stop_signal); |
ae123ec6 | 1806 | wait_for_inferior (0); |
13437d4b | 1807 | } |
2020b7ab | 1808 | while (tp->stop_signal != TARGET_SIGNAL_TRAP); |
d6b48e9c | 1809 | inf->stop_soon = NO_STOP_QUIETLY; |
ab31aa69 | 1810 | #endif /* defined(_SCO_DS) */ |
13437d4b KB |
1811 | } |
1812 | ||
1813 | static void | |
1814 | svr4_clear_solib (void) | |
1815 | { | |
6c95b8df PA |
1816 | struct svr4_info *info; |
1817 | ||
1818 | info = get_svr4_info (); | |
1819 | info->debug_base = 0; | |
1820 | info->debug_loader_offset_p = 0; | |
1821 | info->debug_loader_offset = 0; | |
1822 | xfree (info->debug_loader_name); | |
1823 | info->debug_loader_name = NULL; | |
13437d4b KB |
1824 | } |
1825 | ||
1826 | static void | |
1827 | svr4_free_so (struct so_list *so) | |
1828 | { | |
b8c9b27d KB |
1829 | xfree (so->lm_info->lm); |
1830 | xfree (so->lm_info); | |
13437d4b KB |
1831 | } |
1832 | ||
6bb7be43 JB |
1833 | |
1834 | /* Clear any bits of ADDR that wouldn't fit in a target-format | |
1835 | data pointer. "Data pointer" here refers to whatever sort of | |
1836 | address the dynamic linker uses to manage its sections. At the | |
1837 | moment, we don't support shared libraries on any processors where | |
1838 | code and data pointers are different sizes. | |
1839 | ||
1840 | This isn't really the right solution. What we really need here is | |
1841 | a way to do arithmetic on CORE_ADDR values that respects the | |
1842 | natural pointer/address correspondence. (For example, on the MIPS, | |
1843 | converting a 32-bit pointer to a 64-bit CORE_ADDR requires you to | |
1844 | sign-extend the value. There, simply truncating the bits above | |
819844ad | 1845 | gdbarch_ptr_bit, as we do below, is no good.) This should probably |
6bb7be43 JB |
1846 | be a new gdbarch method or something. */ |
1847 | static CORE_ADDR | |
1848 | svr4_truncate_ptr (CORE_ADDR addr) | |
1849 | { | |
1cf3db46 | 1850 | if (gdbarch_ptr_bit (target_gdbarch) == sizeof (CORE_ADDR) * 8) |
6bb7be43 JB |
1851 | /* We don't need to truncate anything, and the bit twiddling below |
1852 | will fail due to overflow problems. */ | |
1853 | return addr; | |
1854 | else | |
1cf3db46 | 1855 | return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch)) - 1); |
6bb7be43 JB |
1856 | } |
1857 | ||
1858 | ||
749499cb KB |
1859 | static void |
1860 | svr4_relocate_section_addresses (struct so_list *so, | |
0542c86d | 1861 | struct target_section *sec) |
749499cb | 1862 | { |
cc10cae3 AO |
1863 | sec->addr = svr4_truncate_ptr (sec->addr + LM_ADDR_CHECK (so, |
1864 | sec->bfd)); | |
1865 | sec->endaddr = svr4_truncate_ptr (sec->endaddr + LM_ADDR_CHECK (so, | |
1866 | sec->bfd)); | |
749499cb | 1867 | } |
4b188b9f | 1868 | \f |
749499cb | 1869 | |
4b188b9f | 1870 | /* Architecture-specific operations. */ |
6bb7be43 | 1871 | |
4b188b9f MK |
1872 | /* Per-architecture data key. */ |
1873 | static struct gdbarch_data *solib_svr4_data; | |
e5e2b9ff | 1874 | |
4b188b9f | 1875 | struct solib_svr4_ops |
e5e2b9ff | 1876 | { |
4b188b9f MK |
1877 | /* Return a description of the layout of `struct link_map'. */ |
1878 | struct link_map_offsets *(*fetch_link_map_offsets)(void); | |
1879 | }; | |
e5e2b9ff | 1880 | |
4b188b9f | 1881 | /* Return a default for the architecture-specific operations. */ |
e5e2b9ff | 1882 | |
4b188b9f MK |
1883 | static void * |
1884 | solib_svr4_init (struct obstack *obstack) | |
e5e2b9ff | 1885 | { |
4b188b9f | 1886 | struct solib_svr4_ops *ops; |
e5e2b9ff | 1887 | |
4b188b9f | 1888 | ops = OBSTACK_ZALLOC (obstack, struct solib_svr4_ops); |
8d005789 | 1889 | ops->fetch_link_map_offsets = NULL; |
4b188b9f | 1890 | return ops; |
e5e2b9ff KB |
1891 | } |
1892 | ||
4b188b9f | 1893 | /* Set the architecture-specific `struct link_map_offsets' fetcher for |
7e3cb44c | 1894 | GDBARCH to FLMO. Also, install SVR4 solib_ops into GDBARCH. */ |
1c4dcb57 | 1895 | |
21479ded | 1896 | void |
e5e2b9ff KB |
1897 | set_solib_svr4_fetch_link_map_offsets (struct gdbarch *gdbarch, |
1898 | struct link_map_offsets *(*flmo) (void)) | |
21479ded | 1899 | { |
4b188b9f MK |
1900 | struct solib_svr4_ops *ops = gdbarch_data (gdbarch, solib_svr4_data); |
1901 | ||
1902 | ops->fetch_link_map_offsets = flmo; | |
7e3cb44c UW |
1903 | |
1904 | set_solib_ops (gdbarch, &svr4_so_ops); | |
21479ded KB |
1905 | } |
1906 | ||
4b188b9f MK |
1907 | /* Fetch a link_map_offsets structure using the architecture-specific |
1908 | `struct link_map_offsets' fetcher. */ | |
1c4dcb57 | 1909 | |
4b188b9f MK |
1910 | static struct link_map_offsets * |
1911 | svr4_fetch_link_map_offsets (void) | |
21479ded | 1912 | { |
1cf3db46 | 1913 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data); |
4b188b9f MK |
1914 | |
1915 | gdb_assert (ops->fetch_link_map_offsets); | |
1916 | return ops->fetch_link_map_offsets (); | |
21479ded KB |
1917 | } |
1918 | ||
4b188b9f MK |
1919 | /* Return 1 if a link map offset fetcher has been defined, 0 otherwise. */ |
1920 | ||
1921 | static int | |
1922 | svr4_have_link_map_offsets (void) | |
1923 | { | |
1cf3db46 | 1924 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data); |
4b188b9f MK |
1925 | return (ops->fetch_link_map_offsets != NULL); |
1926 | } | |
1927 | \f | |
1928 | ||
e4bbbda8 MK |
1929 | /* Most OS'es that have SVR4-style ELF dynamic libraries define a |
1930 | `struct r_debug' and a `struct link_map' that are binary compatible | |
1931 | with the origional SVR4 implementation. */ | |
1932 | ||
1933 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
1934 | for an ILP32 SVR4 system. */ | |
1935 | ||
1936 | struct link_map_offsets * | |
1937 | svr4_ilp32_fetch_link_map_offsets (void) | |
1938 | { | |
1939 | static struct link_map_offsets lmo; | |
1940 | static struct link_map_offsets *lmp = NULL; | |
1941 | ||
1942 | if (lmp == NULL) | |
1943 | { | |
1944 | lmp = &lmo; | |
1945 | ||
e4cd0d6a MK |
1946 | lmo.r_version_offset = 0; |
1947 | lmo.r_version_size = 4; | |
e4bbbda8 | 1948 | lmo.r_map_offset = 4; |
7cd25cfc | 1949 | lmo.r_brk_offset = 8; |
e4cd0d6a | 1950 | lmo.r_ldsomap_offset = 20; |
e4bbbda8 MK |
1951 | |
1952 | /* Everything we need is in the first 20 bytes. */ | |
1953 | lmo.link_map_size = 20; | |
1954 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 1955 | lmo.l_name_offset = 4; |
cc10cae3 | 1956 | lmo.l_ld_offset = 8; |
e4bbbda8 | 1957 | lmo.l_next_offset = 12; |
e4bbbda8 | 1958 | lmo.l_prev_offset = 16; |
e4bbbda8 MK |
1959 | } |
1960 | ||
1961 | return lmp; | |
1962 | } | |
1963 | ||
1964 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
1965 | for an LP64 SVR4 system. */ | |
1966 | ||
1967 | struct link_map_offsets * | |
1968 | svr4_lp64_fetch_link_map_offsets (void) | |
1969 | { | |
1970 | static struct link_map_offsets lmo; | |
1971 | static struct link_map_offsets *lmp = NULL; | |
1972 | ||
1973 | if (lmp == NULL) | |
1974 | { | |
1975 | lmp = &lmo; | |
1976 | ||
e4cd0d6a MK |
1977 | lmo.r_version_offset = 0; |
1978 | lmo.r_version_size = 4; | |
e4bbbda8 | 1979 | lmo.r_map_offset = 8; |
7cd25cfc | 1980 | lmo.r_brk_offset = 16; |
e4cd0d6a | 1981 | lmo.r_ldsomap_offset = 40; |
e4bbbda8 MK |
1982 | |
1983 | /* Everything we need is in the first 40 bytes. */ | |
1984 | lmo.link_map_size = 40; | |
1985 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 1986 | lmo.l_name_offset = 8; |
cc10cae3 | 1987 | lmo.l_ld_offset = 16; |
e4bbbda8 | 1988 | lmo.l_next_offset = 24; |
e4bbbda8 | 1989 | lmo.l_prev_offset = 32; |
e4bbbda8 MK |
1990 | } |
1991 | ||
1992 | return lmp; | |
1993 | } | |
1994 | \f | |
1995 | ||
7d522c90 | 1996 | struct target_so_ops svr4_so_ops; |
13437d4b | 1997 | |
3a40aaa0 UW |
1998 | /* Lookup global symbol for ELF DSOs linked with -Bsymbolic. Those DSOs have a |
1999 | different rule for symbol lookup. The lookup begins here in the DSO, not in | |
2000 | the main executable. */ | |
2001 | ||
2002 | static struct symbol * | |
2003 | elf_lookup_lib_symbol (const struct objfile *objfile, | |
2004 | const char *name, | |
2005 | const char *linkage_name, | |
21b556f4 | 2006 | const domain_enum domain) |
3a40aaa0 | 2007 | { |
61f0d762 JK |
2008 | bfd *abfd; |
2009 | ||
2010 | if (objfile == symfile_objfile) | |
2011 | abfd = exec_bfd; | |
2012 | else | |
2013 | { | |
2014 | /* OBJFILE should have been passed as the non-debug one. */ | |
2015 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
2016 | ||
2017 | abfd = objfile->obfd; | |
2018 | } | |
2019 | ||
2020 | if (abfd == NULL || scan_dyntag (DT_SYMBOLIC, abfd, NULL) != 1) | |
3a40aaa0 UW |
2021 | return NULL; |
2022 | ||
65728c26 | 2023 | return lookup_global_symbol_from_objfile |
21b556f4 | 2024 | (objfile, name, linkage_name, domain); |
3a40aaa0 UW |
2025 | } |
2026 | ||
a78f21af AC |
2027 | extern initialize_file_ftype _initialize_svr4_solib; /* -Wmissing-prototypes */ |
2028 | ||
13437d4b KB |
2029 | void |
2030 | _initialize_svr4_solib (void) | |
2031 | { | |
4b188b9f | 2032 | solib_svr4_data = gdbarch_data_register_pre_init (solib_svr4_init); |
6c95b8df PA |
2033 | solib_svr4_pspace_data |
2034 | = register_program_space_data_with_cleanup (svr4_pspace_data_cleanup); | |
4b188b9f | 2035 | |
749499cb | 2036 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b KB |
2037 | svr4_so_ops.free_so = svr4_free_so; |
2038 | svr4_so_ops.clear_solib = svr4_clear_solib; | |
2039 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
2040 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |
2041 | svr4_so_ops.current_sos = svr4_current_sos; | |
2042 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
d7fa2ae2 | 2043 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; |
831a0c44 | 2044 | svr4_so_ops.bfd_open = solib_bfd_open; |
3a40aaa0 | 2045 | svr4_so_ops.lookup_lib_global_symbol = elf_lookup_lib_symbol; |
a7c02bc8 | 2046 | svr4_so_ops.same = svr4_same; |
de18c1d8 | 2047 | svr4_so_ops.keep_data_in_core = svr4_keep_data_in_core; |
13437d4b | 2048 | } |