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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 | |
220 | quite work. */ | |
f1e55806 | 221 | if ((l_addr & align) == ((l_dynaddr - dynaddr) & align)) |
cc10cae3 AO |
222 | { |
223 | l_addr = l_dynaddr - dynaddr; | |
79d4c408 DJ |
224 | |
225 | warning (_(".dynamic section for \"%s\" " | |
226 | "is not at the expected address"), so->so_name); | |
cc10cae3 AO |
227 | warning (_("difference appears to be caused by prelink, " |
228 | "adjusting expectations")); | |
229 | } | |
79d4c408 DJ |
230 | else |
231 | warning (_(".dynamic section for \"%s\" " | |
232 | "is not at the expected address " | |
233 | "(wrong library or version mismatch?)"), so->so_name); | |
cc10cae3 AO |
234 | } |
235 | ||
236 | set_addr: | |
237 | so->lm_info->l_addr = l_addr; | |
238 | } | |
239 | ||
240 | return so->lm_info->l_addr; | |
241 | } | |
242 | ||
13437d4b KB |
243 | static CORE_ADDR |
244 | LM_NEXT (struct so_list *so) | |
245 | { | |
4b188b9f | 246 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 247 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 248 | |
cfaefc65 | 249 | return extract_typed_address (so->lm_info->lm + lmo->l_next_offset, |
b6da22b0 | 250 | ptr_type); |
13437d4b KB |
251 | } |
252 | ||
253 | static CORE_ADDR | |
254 | LM_NAME (struct so_list *so) | |
255 | { | |
4b188b9f | 256 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 257 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 258 | |
cfaefc65 | 259 | return extract_typed_address (so->lm_info->lm + lmo->l_name_offset, |
b6da22b0 | 260 | ptr_type); |
13437d4b KB |
261 | } |
262 | ||
13437d4b KB |
263 | static int |
264 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
265 | { | |
4b188b9f | 266 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 267 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 268 | |
e499d0f1 DJ |
269 | /* Assume that everything is a library if the dynamic loader was loaded |
270 | late by a static executable. */ | |
0763ab81 | 271 | if (exec_bfd && bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL) |
e499d0f1 DJ |
272 | return 0; |
273 | ||
cfaefc65 | 274 | return extract_typed_address (so->lm_info->lm + lmo->l_prev_offset, |
b6da22b0 | 275 | ptr_type) == 0; |
13437d4b KB |
276 | } |
277 | ||
6c95b8df | 278 | /* Per pspace SVR4 specific data. */ |
13437d4b | 279 | |
1a816a87 PA |
280 | struct svr4_info |
281 | { | |
1a816a87 PA |
282 | CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
283 | ||
284 | /* Validity flag for debug_loader_offset. */ | |
285 | int debug_loader_offset_p; | |
286 | ||
287 | /* Load address for the dynamic linker, inferred. */ | |
288 | CORE_ADDR debug_loader_offset; | |
289 | ||
290 | /* Name of the dynamic linker, valid if debug_loader_offset_p. */ | |
291 | char *debug_loader_name; | |
292 | ||
293 | /* Load map address for the main executable. */ | |
294 | CORE_ADDR main_lm_addr; | |
1a816a87 | 295 | |
6c95b8df PA |
296 | CORE_ADDR interp_text_sect_low; |
297 | CORE_ADDR interp_text_sect_high; | |
298 | CORE_ADDR interp_plt_sect_low; | |
299 | CORE_ADDR interp_plt_sect_high; | |
300 | }; | |
1a816a87 | 301 | |
6c95b8df PA |
302 | /* Per-program-space data key. */ |
303 | static const struct program_space_data *solib_svr4_pspace_data; | |
1a816a87 | 304 | |
6c95b8df PA |
305 | static void |
306 | svr4_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
1a816a87 | 307 | { |
6c95b8df | 308 | struct svr4_info *info; |
1a816a87 | 309 | |
6c95b8df PA |
310 | info = program_space_data (pspace, solib_svr4_pspace_data); |
311 | xfree (info); | |
1a816a87 PA |
312 | } |
313 | ||
6c95b8df PA |
314 | /* Get the current svr4 data. If none is found yet, add it now. This |
315 | function always returns a valid object. */ | |
34439770 | 316 | |
6c95b8df PA |
317 | static struct svr4_info * |
318 | get_svr4_info (void) | |
1a816a87 | 319 | { |
6c95b8df | 320 | struct svr4_info *info; |
1a816a87 | 321 | |
6c95b8df PA |
322 | info = program_space_data (current_program_space, solib_svr4_pspace_data); |
323 | if (info != NULL) | |
324 | return info; | |
34439770 | 325 | |
6c95b8df PA |
326 | info = XZALLOC (struct svr4_info); |
327 | set_program_space_data (current_program_space, solib_svr4_pspace_data, info); | |
328 | return info; | |
1a816a87 | 329 | } |
93a57060 | 330 | |
13437d4b KB |
331 | /* Local function prototypes */ |
332 | ||
333 | static int match_main (char *); | |
334 | ||
2bbe3cc1 | 335 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *); |
13437d4b KB |
336 | |
337 | /* | |
338 | ||
339 | LOCAL FUNCTION | |
340 | ||
341 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
342 | ||
343 | SYNOPSIS | |
344 | ||
2bbe3cc1 | 345 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) |
13437d4b KB |
346 | |
347 | DESCRIPTION | |
348 | ||
349 | An expensive way to lookup the value of a single symbol for | |
350 | bfd's that are only temporary anyway. This is used by the | |
351 | shared library support to find the address of the debugger | |
2bbe3cc1 | 352 | notification routine in the shared library. |
13437d4b | 353 | |
2bbe3cc1 DJ |
354 | The returned symbol may be in a code or data section; functions |
355 | will normally be in a code section, but may be in a data section | |
356 | if this architecture uses function descriptors. | |
87f84c9d | 357 | |
13437d4b KB |
358 | Note that 0 is specifically allowed as an error return (no |
359 | such symbol). | |
360 | */ | |
361 | ||
362 | static CORE_ADDR | |
2bbe3cc1 | 363 | bfd_lookup_symbol (bfd *abfd, char *symname) |
13437d4b | 364 | { |
435b259c | 365 | long storage_needed; |
13437d4b KB |
366 | asymbol *sym; |
367 | asymbol **symbol_table; | |
368 | unsigned int number_of_symbols; | |
369 | unsigned int i; | |
370 | struct cleanup *back_to; | |
371 | CORE_ADDR symaddr = 0; | |
372 | ||
373 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
374 | ||
375 | if (storage_needed > 0) | |
376 | { | |
377 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 378 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
379 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
380 | ||
381 | for (i = 0; i < number_of_symbols; i++) | |
382 | { | |
383 | sym = *symbol_table++; | |
6314a349 | 384 | if (strcmp (sym->name, symname) == 0 |
2bbe3cc1 | 385 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) |
13437d4b | 386 | { |
2bbe3cc1 | 387 | /* BFD symbols are section relative. */ |
13437d4b KB |
388 | symaddr = sym->value + sym->section->vma; |
389 | break; | |
390 | } | |
391 | } | |
392 | do_cleanups (back_to); | |
393 | } | |
394 | ||
395 | if (symaddr) | |
396 | return symaddr; | |
397 | ||
398 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll | |
399 | have to check the dynamic string table too. */ | |
400 | ||
401 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
402 | ||
403 | if (storage_needed > 0) | |
404 | { | |
405 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 406 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
407 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table); |
408 | ||
409 | for (i = 0; i < number_of_symbols; i++) | |
410 | { | |
411 | sym = *symbol_table++; | |
87f84c9d | 412 | |
6314a349 | 413 | if (strcmp (sym->name, symname) == 0 |
2bbe3cc1 | 414 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) |
13437d4b | 415 | { |
2bbe3cc1 | 416 | /* BFD symbols are section relative. */ |
13437d4b KB |
417 | symaddr = sym->value + sym->section->vma; |
418 | break; | |
419 | } | |
420 | } | |
421 | do_cleanups (back_to); | |
422 | } | |
423 | ||
424 | return symaddr; | |
425 | } | |
426 | ||
97ec2c2f UW |
427 | |
428 | /* Read program header TYPE from inferior memory. The header is found | |
429 | by scanning the OS auxillary vector. | |
430 | ||
431 | Return a pointer to allocated memory holding the program header contents, | |
432 | or NULL on failure. If sucessful, and unless P_SECT_SIZE is NULL, the | |
433 | size of those contents is returned to P_SECT_SIZE. Likewise, the target | |
434 | architecture size (32-bit or 64-bit) is returned to P_ARCH_SIZE. */ | |
435 | ||
436 | static gdb_byte * | |
437 | read_program_header (int type, int *p_sect_size, int *p_arch_size) | |
438 | { | |
e17a4113 | 439 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
97ec2c2f UW |
440 | CORE_ADDR at_phdr, at_phent, at_phnum; |
441 | int arch_size, sect_size; | |
442 | CORE_ADDR sect_addr; | |
443 | gdb_byte *buf; | |
444 | ||
445 | /* Get required auxv elements from target. */ | |
446 | if (target_auxv_search (¤t_target, AT_PHDR, &at_phdr) <= 0) | |
447 | return 0; | |
448 | if (target_auxv_search (¤t_target, AT_PHENT, &at_phent) <= 0) | |
449 | return 0; | |
450 | if (target_auxv_search (¤t_target, AT_PHNUM, &at_phnum) <= 0) | |
451 | return 0; | |
452 | if (!at_phdr || !at_phnum) | |
453 | return 0; | |
454 | ||
455 | /* Determine ELF architecture type. */ | |
456 | if (at_phent == sizeof (Elf32_External_Phdr)) | |
457 | arch_size = 32; | |
458 | else if (at_phent == sizeof (Elf64_External_Phdr)) | |
459 | arch_size = 64; | |
460 | else | |
461 | return 0; | |
462 | ||
463 | /* Find .dynamic section via the PT_DYNAMIC PHDR. */ | |
464 | if (arch_size == 32) | |
465 | { | |
466 | Elf32_External_Phdr phdr; | |
467 | int i; | |
468 | ||
469 | /* Search for requested PHDR. */ | |
470 | for (i = 0; i < at_phnum; i++) | |
471 | { | |
472 | if (target_read_memory (at_phdr + i * sizeof (phdr), | |
473 | (gdb_byte *)&phdr, sizeof (phdr))) | |
474 | return 0; | |
475 | ||
e17a4113 UW |
476 | if (extract_unsigned_integer ((gdb_byte *)phdr.p_type, |
477 | 4, byte_order) == type) | |
97ec2c2f UW |
478 | break; |
479 | } | |
480 | ||
481 | if (i == at_phnum) | |
482 | return 0; | |
483 | ||
484 | /* Retrieve address and size. */ | |
e17a4113 UW |
485 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
486 | 4, byte_order); | |
487 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
488 | 4, byte_order); | |
97ec2c2f UW |
489 | } |
490 | else | |
491 | { | |
492 | Elf64_External_Phdr phdr; | |
493 | int i; | |
494 | ||
495 | /* Search for requested PHDR. */ | |
496 | for (i = 0; i < at_phnum; i++) | |
497 | { | |
498 | if (target_read_memory (at_phdr + i * sizeof (phdr), | |
499 | (gdb_byte *)&phdr, sizeof (phdr))) | |
500 | return 0; | |
501 | ||
e17a4113 UW |
502 | if (extract_unsigned_integer ((gdb_byte *)phdr.p_type, |
503 | 4, byte_order) == type) | |
97ec2c2f UW |
504 | break; |
505 | } | |
506 | ||
507 | if (i == at_phnum) | |
508 | return 0; | |
509 | ||
510 | /* Retrieve address and size. */ | |
e17a4113 UW |
511 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
512 | 8, byte_order); | |
513 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
514 | 8, byte_order); | |
97ec2c2f UW |
515 | } |
516 | ||
517 | /* Read in requested program header. */ | |
518 | buf = xmalloc (sect_size); | |
519 | if (target_read_memory (sect_addr, buf, sect_size)) | |
520 | { | |
521 | xfree (buf); | |
522 | return NULL; | |
523 | } | |
524 | ||
525 | if (p_arch_size) | |
526 | *p_arch_size = arch_size; | |
527 | if (p_sect_size) | |
528 | *p_sect_size = sect_size; | |
529 | ||
530 | return buf; | |
531 | } | |
532 | ||
533 | ||
534 | /* Return program interpreter string. */ | |
535 | static gdb_byte * | |
536 | find_program_interpreter (void) | |
537 | { | |
538 | gdb_byte *buf = NULL; | |
539 | ||
540 | /* If we have an exec_bfd, use its section table. */ | |
541 | if (exec_bfd | |
542 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
543 | { | |
544 | struct bfd_section *interp_sect; | |
545 | ||
546 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
547 | if (interp_sect != NULL) | |
548 | { | |
549 | CORE_ADDR sect_addr = bfd_section_vma (exec_bfd, interp_sect); | |
550 | int sect_size = bfd_section_size (exec_bfd, interp_sect); | |
551 | ||
552 | buf = xmalloc (sect_size); | |
553 | bfd_get_section_contents (exec_bfd, interp_sect, buf, 0, sect_size); | |
554 | } | |
555 | } | |
556 | ||
557 | /* If we didn't find it, use the target auxillary vector. */ | |
558 | if (!buf) | |
559 | buf = read_program_header (PT_INTERP, NULL, NULL); | |
560 | ||
561 | return buf; | |
562 | } | |
563 | ||
564 | ||
3a40aaa0 UW |
565 | /* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is |
566 | returned and the corresponding PTR is set. */ | |
567 | ||
568 | static int | |
569 | scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr) | |
570 | { | |
571 | int arch_size, step, sect_size; | |
572 | long dyn_tag; | |
b381ea14 | 573 | CORE_ADDR dyn_ptr, dyn_addr; |
65728c26 | 574 | gdb_byte *bufend, *bufstart, *buf; |
3a40aaa0 UW |
575 | Elf32_External_Dyn *x_dynp_32; |
576 | Elf64_External_Dyn *x_dynp_64; | |
577 | struct bfd_section *sect; | |
61f0d762 | 578 | struct target_section *target_section; |
3a40aaa0 UW |
579 | |
580 | if (abfd == NULL) | |
581 | return 0; | |
0763ab81 PA |
582 | |
583 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
584 | return 0; | |
585 | ||
3a40aaa0 UW |
586 | arch_size = bfd_get_arch_size (abfd); |
587 | if (arch_size == -1) | |
0763ab81 | 588 | return 0; |
3a40aaa0 UW |
589 | |
590 | /* Find the start address of the .dynamic section. */ | |
591 | sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
592 | if (sect == NULL) | |
593 | return 0; | |
61f0d762 JK |
594 | |
595 | for (target_section = current_target_sections->sections; | |
596 | target_section < current_target_sections->sections_end; | |
597 | target_section++) | |
598 | if (sect == target_section->the_bfd_section) | |
599 | break; | |
b381ea14 JK |
600 | if (target_section < current_target_sections->sections_end) |
601 | dyn_addr = target_section->addr; | |
602 | else | |
603 | { | |
604 | /* ABFD may come from OBJFILE acting only as a symbol file without being | |
605 | loaded into the target (see add_symbol_file_command). This case is | |
606 | such fallback to the file VMA address without the possibility of | |
607 | having the section relocated to its actual in-memory address. */ | |
608 | ||
609 | dyn_addr = bfd_section_vma (abfd, sect); | |
610 | } | |
3a40aaa0 | 611 | |
65728c26 DJ |
612 | /* Read in .dynamic from the BFD. We will get the actual value |
613 | from memory later. */ | |
3a40aaa0 | 614 | sect_size = bfd_section_size (abfd, sect); |
65728c26 DJ |
615 | buf = bufstart = alloca (sect_size); |
616 | if (!bfd_get_section_contents (abfd, sect, | |
617 | buf, 0, sect_size)) | |
618 | return 0; | |
3a40aaa0 UW |
619 | |
620 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
621 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
622 | : sizeof (Elf64_External_Dyn); | |
623 | for (bufend = buf + sect_size; | |
624 | buf < bufend; | |
625 | buf += step) | |
626 | { | |
627 | if (arch_size == 32) | |
628 | { | |
629 | x_dynp_32 = (Elf32_External_Dyn *) buf; | |
630 | dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag); | |
631 | dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr); | |
632 | } | |
65728c26 | 633 | else |
3a40aaa0 UW |
634 | { |
635 | x_dynp_64 = (Elf64_External_Dyn *) buf; | |
636 | dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag); | |
637 | dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr); | |
638 | } | |
639 | if (dyn_tag == DT_NULL) | |
640 | return 0; | |
641 | if (dyn_tag == dyntag) | |
642 | { | |
65728c26 DJ |
643 | /* If requested, try to read the runtime value of this .dynamic |
644 | entry. */ | |
3a40aaa0 | 645 | if (ptr) |
65728c26 | 646 | { |
b6da22b0 | 647 | struct type *ptr_type; |
65728c26 DJ |
648 | gdb_byte ptr_buf[8]; |
649 | CORE_ADDR ptr_addr; | |
650 | ||
b6da22b0 | 651 | ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
b381ea14 | 652 | ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8; |
65728c26 | 653 | if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0) |
b6da22b0 | 654 | dyn_ptr = extract_typed_address (ptr_buf, ptr_type); |
65728c26 DJ |
655 | *ptr = dyn_ptr; |
656 | } | |
657 | return 1; | |
3a40aaa0 UW |
658 | } |
659 | } | |
660 | ||
661 | return 0; | |
662 | } | |
663 | ||
97ec2c2f UW |
664 | /* Scan for DYNTAG in .dynamic section of the target's main executable, |
665 | found by consulting the OS auxillary vector. If DYNTAG is found 1 is | |
666 | returned and the corresponding PTR is set. */ | |
667 | ||
668 | static int | |
669 | scan_dyntag_auxv (int dyntag, CORE_ADDR *ptr) | |
670 | { | |
e17a4113 | 671 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
97ec2c2f UW |
672 | int sect_size, arch_size, step; |
673 | long dyn_tag; | |
674 | CORE_ADDR dyn_ptr; | |
675 | gdb_byte *bufend, *bufstart, *buf; | |
676 | ||
677 | /* Read in .dynamic section. */ | |
678 | buf = bufstart = read_program_header (PT_DYNAMIC, §_size, &arch_size); | |
679 | if (!buf) | |
680 | return 0; | |
681 | ||
682 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
683 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
684 | : sizeof (Elf64_External_Dyn); | |
685 | for (bufend = buf + sect_size; | |
686 | buf < bufend; | |
687 | buf += step) | |
688 | { | |
689 | if (arch_size == 32) | |
690 | { | |
691 | Elf32_External_Dyn *dynp = (Elf32_External_Dyn *) buf; | |
e17a4113 UW |
692 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
693 | 4, byte_order); | |
694 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
695 | 4, byte_order); | |
97ec2c2f UW |
696 | } |
697 | else | |
698 | { | |
699 | Elf64_External_Dyn *dynp = (Elf64_External_Dyn *) buf; | |
e17a4113 UW |
700 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
701 | 8, byte_order); | |
702 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
703 | 8, byte_order); | |
97ec2c2f UW |
704 | } |
705 | if (dyn_tag == DT_NULL) | |
706 | break; | |
707 | ||
708 | if (dyn_tag == dyntag) | |
709 | { | |
710 | if (ptr) | |
711 | *ptr = dyn_ptr; | |
712 | ||
713 | xfree (bufstart); | |
714 | return 1; | |
715 | } | |
716 | } | |
717 | ||
718 | xfree (bufstart); | |
719 | return 0; | |
720 | } | |
721 | ||
3a40aaa0 | 722 | |
13437d4b KB |
723 | /* |
724 | ||
725 | LOCAL FUNCTION | |
726 | ||
727 | elf_locate_base -- locate the base address of dynamic linker structs | |
728 | for SVR4 elf targets. | |
729 | ||
730 | SYNOPSIS | |
731 | ||
732 | CORE_ADDR elf_locate_base (void) | |
733 | ||
734 | DESCRIPTION | |
735 | ||
736 | For SVR4 elf targets the address of the dynamic linker's runtime | |
737 | structure is contained within the dynamic info section in the | |
738 | executable file. The dynamic section is also mapped into the | |
739 | inferior address space. Because the runtime loader fills in the | |
740 | real address before starting the inferior, we have to read in the | |
741 | dynamic info section from the inferior address space. | |
742 | If there are any errors while trying to find the address, we | |
743 | silently return 0, otherwise the found address is returned. | |
744 | ||
745 | */ | |
746 | ||
747 | static CORE_ADDR | |
748 | elf_locate_base (void) | |
749 | { | |
3a40aaa0 UW |
750 | struct minimal_symbol *msymbol; |
751 | CORE_ADDR dyn_ptr; | |
13437d4b | 752 | |
65728c26 DJ |
753 | /* Look for DT_MIPS_RLD_MAP first. MIPS executables use this |
754 | instead of DT_DEBUG, although they sometimes contain an unused | |
755 | DT_DEBUG. */ | |
97ec2c2f UW |
756 | if (scan_dyntag (DT_MIPS_RLD_MAP, exec_bfd, &dyn_ptr) |
757 | || scan_dyntag_auxv (DT_MIPS_RLD_MAP, &dyn_ptr)) | |
3a40aaa0 | 758 | { |
b6da22b0 | 759 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
3a40aaa0 | 760 | gdb_byte *pbuf; |
b6da22b0 | 761 | int pbuf_size = TYPE_LENGTH (ptr_type); |
3a40aaa0 UW |
762 | pbuf = alloca (pbuf_size); |
763 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
764 | of the dynamic link structure. */ | |
765 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) | |
e499d0f1 | 766 | return 0; |
b6da22b0 | 767 | return extract_typed_address (pbuf, ptr_type); |
e499d0f1 DJ |
768 | } |
769 | ||
65728c26 | 770 | /* Find DT_DEBUG. */ |
97ec2c2f UW |
771 | if (scan_dyntag (DT_DEBUG, exec_bfd, &dyn_ptr) |
772 | || scan_dyntag_auxv (DT_DEBUG, &dyn_ptr)) | |
65728c26 DJ |
773 | return dyn_ptr; |
774 | ||
3a40aaa0 UW |
775 | /* This may be a static executable. Look for the symbol |
776 | conventionally named _r_debug, as a last resort. */ | |
777 | msymbol = lookup_minimal_symbol ("_r_debug", NULL, symfile_objfile); | |
778 | if (msymbol != NULL) | |
779 | return SYMBOL_VALUE_ADDRESS (msymbol); | |
13437d4b KB |
780 | |
781 | /* DT_DEBUG entry not found. */ | |
782 | return 0; | |
783 | } | |
784 | ||
13437d4b KB |
785 | /* |
786 | ||
787 | LOCAL FUNCTION | |
788 | ||
789 | locate_base -- locate the base address of dynamic linker structs | |
790 | ||
791 | SYNOPSIS | |
792 | ||
1a816a87 | 793 | CORE_ADDR locate_base (struct svr4_info *) |
13437d4b KB |
794 | |
795 | DESCRIPTION | |
796 | ||
797 | For both the SunOS and SVR4 shared library implementations, if the | |
798 | inferior executable has been linked dynamically, there is a single | |
799 | address somewhere in the inferior's data space which is the key to | |
800 | locating all of the dynamic linker's runtime structures. This | |
801 | address is the value of the debug base symbol. The job of this | |
802 | function is to find and return that address, or to return 0 if there | |
803 | is no such address (the executable is statically linked for example). | |
804 | ||
805 | For SunOS, the job is almost trivial, since the dynamic linker and | |
806 | all of it's structures are statically linked to the executable at | |
807 | link time. Thus the symbol for the address we are looking for has | |
808 | already been added to the minimal symbol table for the executable's | |
809 | objfile at the time the symbol file's symbols were read, and all we | |
810 | have to do is look it up there. Note that we explicitly do NOT want | |
811 | to find the copies in the shared library. | |
812 | ||
813 | The SVR4 version is a bit more complicated because the address | |
814 | is contained somewhere in the dynamic info section. We have to go | |
815 | to a lot more work to discover the address of the debug base symbol. | |
816 | Because of this complexity, we cache the value we find and return that | |
817 | value on subsequent invocations. Note there is no copy in the | |
818 | executable symbol tables. | |
819 | ||
820 | */ | |
821 | ||
822 | static CORE_ADDR | |
1a816a87 | 823 | locate_base (struct svr4_info *info) |
13437d4b | 824 | { |
13437d4b KB |
825 | /* Check to see if we have a currently valid address, and if so, avoid |
826 | doing all this work again and just return the cached address. If | |
827 | we have no cached address, try to locate it in the dynamic info | |
d5a921c9 KB |
828 | section for ELF executables. There's no point in doing any of this |
829 | though if we don't have some link map offsets to work with. */ | |
13437d4b | 830 | |
1a816a87 | 831 | if (info->debug_base == 0 && svr4_have_link_map_offsets ()) |
0763ab81 | 832 | info->debug_base = elf_locate_base (); |
1a816a87 | 833 | return info->debug_base; |
13437d4b KB |
834 | } |
835 | ||
e4cd0d6a MK |
836 | /* Find the first element in the inferior's dynamic link map, and |
837 | return its address in the inferior. | |
13437d4b | 838 | |
e4cd0d6a MK |
839 | FIXME: Perhaps we should validate the info somehow, perhaps by |
840 | checking r_version for a known version number, or r_state for | |
841 | RT_CONSISTENT. */ | |
13437d4b KB |
842 | |
843 | static CORE_ADDR | |
1a816a87 | 844 | solib_svr4_r_map (struct svr4_info *info) |
13437d4b | 845 | { |
4b188b9f | 846 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 847 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 848 | |
1a816a87 PA |
849 | return read_memory_typed_address (info->debug_base + lmo->r_map_offset, |
850 | ptr_type); | |
e4cd0d6a | 851 | } |
13437d4b | 852 | |
7cd25cfc DJ |
853 | /* Find r_brk from the inferior's debug base. */ |
854 | ||
855 | static CORE_ADDR | |
1a816a87 | 856 | solib_svr4_r_brk (struct svr4_info *info) |
7cd25cfc DJ |
857 | { |
858 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 859 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
7cd25cfc | 860 | |
1a816a87 PA |
861 | return read_memory_typed_address (info->debug_base + lmo->r_brk_offset, |
862 | ptr_type); | |
7cd25cfc DJ |
863 | } |
864 | ||
e4cd0d6a MK |
865 | /* Find the link map for the dynamic linker (if it is not in the |
866 | normal list of loaded shared objects). */ | |
13437d4b | 867 | |
e4cd0d6a | 868 | static CORE_ADDR |
1a816a87 | 869 | solib_svr4_r_ldsomap (struct svr4_info *info) |
e4cd0d6a MK |
870 | { |
871 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 872 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
e17a4113 | 873 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
e4cd0d6a | 874 | ULONGEST version; |
13437d4b | 875 | |
e4cd0d6a MK |
876 | /* Check version, and return zero if `struct r_debug' doesn't have |
877 | the r_ldsomap member. */ | |
1a816a87 PA |
878 | version |
879 | = read_memory_unsigned_integer (info->debug_base + lmo->r_version_offset, | |
e17a4113 | 880 | lmo->r_version_size, byte_order); |
e4cd0d6a MK |
881 | if (version < 2 || lmo->r_ldsomap_offset == -1) |
882 | return 0; | |
13437d4b | 883 | |
1a816a87 | 884 | return read_memory_typed_address (info->debug_base + lmo->r_ldsomap_offset, |
b6da22b0 | 885 | ptr_type); |
13437d4b KB |
886 | } |
887 | ||
de18c1d8 JM |
888 | /* On Solaris systems with some versions of the dynamic linker, |
889 | ld.so's l_name pointer points to the SONAME in the string table | |
890 | rather than into writable memory. So that GDB can find shared | |
891 | libraries when loading a core file generated by gcore, ensure that | |
892 | memory areas containing the l_name string are saved in the core | |
893 | file. */ | |
894 | ||
895 | static int | |
896 | svr4_keep_data_in_core (CORE_ADDR vaddr, unsigned long size) | |
897 | { | |
898 | struct svr4_info *info; | |
899 | CORE_ADDR ldsomap; | |
900 | struct so_list *new; | |
901 | struct cleanup *old_chain; | |
902 | struct link_map_offsets *lmo; | |
903 | CORE_ADDR lm_name; | |
904 | ||
905 | info = get_svr4_info (); | |
906 | ||
907 | info->debug_base = 0; | |
908 | locate_base (info); | |
909 | if (!info->debug_base) | |
910 | return 0; | |
911 | ||
912 | ldsomap = solib_svr4_r_ldsomap (info); | |
913 | if (!ldsomap) | |
914 | return 0; | |
915 | ||
916 | lmo = svr4_fetch_link_map_offsets (); | |
917 | new = XZALLOC (struct so_list); | |
918 | old_chain = make_cleanup (xfree, new); | |
919 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
920 | make_cleanup (xfree, new->lm_info); | |
921 | new->lm_info->l_addr = (CORE_ADDR)-1; | |
922 | new->lm_info->lm_addr = ldsomap; | |
923 | new->lm_info->lm = xzalloc (lmo->link_map_size); | |
924 | make_cleanup (xfree, new->lm_info->lm); | |
925 | read_memory (ldsomap, new->lm_info->lm, lmo->link_map_size); | |
926 | lm_name = LM_NAME (new); | |
927 | do_cleanups (old_chain); | |
928 | ||
929 | return (lm_name >= vaddr && lm_name < vaddr + size); | |
930 | } | |
931 | ||
13437d4b KB |
932 | /* |
933 | ||
934 | LOCAL FUNCTION | |
935 | ||
936 | open_symbol_file_object | |
937 | ||
938 | SYNOPSIS | |
939 | ||
940 | void open_symbol_file_object (void *from_tty) | |
941 | ||
942 | DESCRIPTION | |
943 | ||
944 | If no open symbol file, attempt to locate and open the main symbol | |
945 | file. On SVR4 systems, this is the first link map entry. If its | |
946 | name is here, we can open it. Useful when attaching to a process | |
947 | without first loading its symbol file. | |
948 | ||
949 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |
950 | be printed. This parameter is a pointer rather than an int because | |
951 | open_symbol_file_object() is called via catch_errors() and | |
952 | catch_errors() requires a pointer argument. */ | |
953 | ||
954 | static int | |
955 | open_symbol_file_object (void *from_ttyp) | |
956 | { | |
957 | CORE_ADDR lm, l_name; | |
958 | char *filename; | |
959 | int errcode; | |
960 | int from_tty = *(int *)from_ttyp; | |
4b188b9f | 961 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 UW |
962 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
963 | int l_name_size = TYPE_LENGTH (ptr_type); | |
cfaefc65 | 964 | gdb_byte *l_name_buf = xmalloc (l_name_size); |
b8c9b27d | 965 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); |
6c95b8df | 966 | struct svr4_info *info = get_svr4_info (); |
13437d4b KB |
967 | |
968 | if (symfile_objfile) | |
9e2f0ad4 | 969 | if (!query (_("Attempt to reload symbols from process? "))) |
13437d4b KB |
970 | return 0; |
971 | ||
7cd25cfc | 972 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
973 | info->debug_base = 0; |
974 | if (locate_base (info) == 0) | |
13437d4b KB |
975 | return 0; /* failed somehow... */ |
976 | ||
977 | /* First link map member should be the executable. */ | |
1a816a87 | 978 | lm = solib_svr4_r_map (info); |
e4cd0d6a | 979 | if (lm == 0) |
13437d4b KB |
980 | return 0; /* failed somehow... */ |
981 | ||
982 | /* Read address of name from target memory to GDB. */ | |
cfaefc65 | 983 | read_memory (lm + lmo->l_name_offset, l_name_buf, l_name_size); |
13437d4b | 984 | |
cfaefc65 | 985 | /* Convert the address to host format. */ |
b6da22b0 | 986 | l_name = extract_typed_address (l_name_buf, ptr_type); |
13437d4b KB |
987 | |
988 | /* Free l_name_buf. */ | |
989 | do_cleanups (cleanups); | |
990 | ||
991 | if (l_name == 0) | |
992 | return 0; /* No filename. */ | |
993 | ||
994 | /* Now fetch the filename from target memory. */ | |
995 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
ea5bf0a1 | 996 | make_cleanup (xfree, filename); |
13437d4b KB |
997 | |
998 | if (errcode) | |
999 | { | |
8a3fe4f8 | 1000 | warning (_("failed to read exec filename from attached file: %s"), |
13437d4b KB |
1001 | safe_strerror (errcode)); |
1002 | return 0; | |
1003 | } | |
1004 | ||
13437d4b | 1005 | /* Have a pathname: read the symbol file. */ |
1adeb98a | 1006 | symbol_file_add_main (filename, from_tty); |
13437d4b KB |
1007 | |
1008 | return 1; | |
1009 | } | |
13437d4b | 1010 | |
34439770 DJ |
1011 | /* If no shared library information is available from the dynamic |
1012 | linker, build a fallback list from other sources. */ | |
1013 | ||
1014 | static struct so_list * | |
1015 | svr4_default_sos (void) | |
1016 | { | |
6c95b8df | 1017 | struct svr4_info *info = get_svr4_info (); |
1a816a87 | 1018 | |
34439770 DJ |
1019 | struct so_list *head = NULL; |
1020 | struct so_list **link_ptr = &head; | |
1021 | ||
1a816a87 | 1022 | if (info->debug_loader_offset_p) |
34439770 DJ |
1023 | { |
1024 | struct so_list *new = XZALLOC (struct so_list); | |
1025 | ||
1026 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
1027 | ||
1028 | /* Nothing will ever check the cached copy of the link | |
1029 | map if we set l_addr. */ | |
1a816a87 | 1030 | new->lm_info->l_addr = info->debug_loader_offset; |
93a57060 | 1031 | new->lm_info->lm_addr = 0; |
34439770 DJ |
1032 | new->lm_info->lm = NULL; |
1033 | ||
1a816a87 PA |
1034 | strncpy (new->so_name, info->debug_loader_name, |
1035 | SO_NAME_MAX_PATH_SIZE - 1); | |
34439770 DJ |
1036 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
1037 | strcpy (new->so_original_name, new->so_name); | |
1038 | ||
1039 | *link_ptr = new; | |
1040 | link_ptr = &new->next; | |
1041 | } | |
1042 | ||
1043 | return head; | |
1044 | } | |
1045 | ||
13437d4b KB |
1046 | /* LOCAL FUNCTION |
1047 | ||
1048 | current_sos -- build a list of currently loaded shared objects | |
1049 | ||
1050 | SYNOPSIS | |
1051 | ||
1052 | struct so_list *current_sos () | |
1053 | ||
1054 | DESCRIPTION | |
1055 | ||
1056 | Build a list of `struct so_list' objects describing the shared | |
1057 | objects currently loaded in the inferior. This list does not | |
1058 | include an entry for the main executable file. | |
1059 | ||
1060 | Note that we only gather information directly available from the | |
1061 | inferior --- we don't examine any of the shared library files | |
1062 | themselves. The declaration of `struct so_list' says which fields | |
1063 | we provide values for. */ | |
1064 | ||
1065 | static struct so_list * | |
1066 | svr4_current_sos (void) | |
1067 | { | |
1068 | CORE_ADDR lm; | |
1069 | struct so_list *head = 0; | |
1070 | struct so_list **link_ptr = &head; | |
e4cd0d6a | 1071 | CORE_ADDR ldsomap = 0; |
1a816a87 PA |
1072 | struct svr4_info *info; |
1073 | ||
6c95b8df | 1074 | info = get_svr4_info (); |
13437d4b | 1075 | |
7cd25cfc | 1076 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
1077 | info->debug_base = 0; |
1078 | locate_base (info); | |
13437d4b | 1079 | |
7cd25cfc DJ |
1080 | /* If we can't find the dynamic linker's base structure, this |
1081 | must not be a dynamically linked executable. Hmm. */ | |
1a816a87 | 1082 | if (! info->debug_base) |
7cd25cfc | 1083 | return svr4_default_sos (); |
13437d4b KB |
1084 | |
1085 | /* Walk the inferior's link map list, and build our list of | |
1086 | `struct so_list' nodes. */ | |
1a816a87 | 1087 | lm = solib_svr4_r_map (info); |
34439770 | 1088 | |
13437d4b KB |
1089 | while (lm) |
1090 | { | |
4b188b9f | 1091 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f4456994 | 1092 | struct so_list *new = XZALLOC (struct so_list); |
b8c9b27d | 1093 | struct cleanup *old_chain = make_cleanup (xfree, new); |
13437d4b | 1094 | |
13437d4b | 1095 | new->lm_info = xmalloc (sizeof (struct lm_info)); |
b8c9b27d | 1096 | make_cleanup (xfree, new->lm_info); |
13437d4b | 1097 | |
831004b7 | 1098 | new->lm_info->l_addr = (CORE_ADDR)-1; |
93a57060 | 1099 | new->lm_info->lm_addr = lm; |
f4456994 | 1100 | new->lm_info->lm = xzalloc (lmo->link_map_size); |
b8c9b27d | 1101 | make_cleanup (xfree, new->lm_info->lm); |
13437d4b KB |
1102 | |
1103 | read_memory (lm, new->lm_info->lm, lmo->link_map_size); | |
1104 | ||
1105 | lm = LM_NEXT (new); | |
1106 | ||
1107 | /* For SVR4 versions, the first entry in the link map is for the | |
1108 | inferior executable, so we must ignore it. For some versions of | |
1109 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1110 | does have a name, so we can no longer use a missing name to | |
1111 | decide when to ignore it. */ | |
e4cd0d6a | 1112 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new) && ldsomap == 0) |
93a57060 | 1113 | { |
1a816a87 | 1114 | info->main_lm_addr = new->lm_info->lm_addr; |
93a57060 DJ |
1115 | free_so (new); |
1116 | } | |
13437d4b KB |
1117 | else |
1118 | { | |
1119 | int errcode; | |
1120 | char *buffer; | |
1121 | ||
1122 | /* Extract this shared object's name. */ | |
1123 | target_read_string (LM_NAME (new), &buffer, | |
1124 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
1125 | if (errcode != 0) | |
8a3fe4f8 AC |
1126 | warning (_("Can't read pathname for load map: %s."), |
1127 | safe_strerror (errcode)); | |
13437d4b KB |
1128 | else |
1129 | { | |
1130 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); | |
1131 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
13437d4b KB |
1132 | strcpy (new->so_original_name, new->so_name); |
1133 | } | |
ea5bf0a1 | 1134 | xfree (buffer); |
13437d4b KB |
1135 | |
1136 | /* If this entry has no name, or its name matches the name | |
1137 | for the main executable, don't include it in the list. */ | |
1138 | if (! new->so_name[0] | |
1139 | || match_main (new->so_name)) | |
1140 | free_so (new); | |
1141 | else | |
1142 | { | |
1143 | new->next = 0; | |
1144 | *link_ptr = new; | |
1145 | link_ptr = &new->next; | |
1146 | } | |
1147 | } | |
1148 | ||
e4cd0d6a MK |
1149 | /* On Solaris, the dynamic linker is not in the normal list of |
1150 | shared objects, so make sure we pick it up too. Having | |
1151 | symbol information for the dynamic linker is quite crucial | |
1152 | for skipping dynamic linker resolver code. */ | |
1153 | if (lm == 0 && ldsomap == 0) | |
1a816a87 | 1154 | lm = ldsomap = solib_svr4_r_ldsomap (info); |
e4cd0d6a | 1155 | |
13437d4b KB |
1156 | discard_cleanups (old_chain); |
1157 | } | |
1158 | ||
34439770 DJ |
1159 | if (head == NULL) |
1160 | return svr4_default_sos (); | |
1161 | ||
13437d4b KB |
1162 | return head; |
1163 | } | |
1164 | ||
93a57060 | 1165 | /* Get the address of the link_map for a given OBJFILE. */ |
bc4a16ae EZ |
1166 | |
1167 | CORE_ADDR | |
1168 | svr4_fetch_objfile_link_map (struct objfile *objfile) | |
1169 | { | |
93a57060 | 1170 | struct so_list *so; |
6c95b8df | 1171 | struct svr4_info *info = get_svr4_info (); |
bc4a16ae | 1172 | |
93a57060 | 1173 | /* Cause svr4_current_sos() to be run if it hasn't been already. */ |
1a816a87 | 1174 | if (info->main_lm_addr == 0) |
93a57060 | 1175 | solib_add (NULL, 0, ¤t_target, auto_solib_add); |
bc4a16ae | 1176 | |
93a57060 DJ |
1177 | /* svr4_current_sos() will set main_lm_addr for the main executable. */ |
1178 | if (objfile == symfile_objfile) | |
1a816a87 | 1179 | return info->main_lm_addr; |
93a57060 DJ |
1180 | |
1181 | /* The other link map addresses may be found by examining the list | |
1182 | of shared libraries. */ | |
1183 | for (so = master_so_list (); so; so = so->next) | |
1184 | if (so->objfile == objfile) | |
1185 | return so->lm_info->lm_addr; | |
1186 | ||
1187 | /* Not found! */ | |
bc4a16ae EZ |
1188 | return 0; |
1189 | } | |
13437d4b KB |
1190 | |
1191 | /* On some systems, the only way to recognize the link map entry for | |
1192 | the main executable file is by looking at its name. Return | |
1193 | non-zero iff SONAME matches one of the known main executable names. */ | |
1194 | ||
1195 | static int | |
1196 | match_main (char *soname) | |
1197 | { | |
1198 | char **mainp; | |
1199 | ||
1200 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
1201 | { | |
1202 | if (strcmp (soname, *mainp) == 0) | |
1203 | return (1); | |
1204 | } | |
1205 | ||
1206 | return (0); | |
1207 | } | |
1208 | ||
13437d4b KB |
1209 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
1210 | SVR4 run time loader. */ | |
13437d4b | 1211 | |
7d522c90 | 1212 | int |
d7fa2ae2 | 1213 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) |
13437d4b | 1214 | { |
6c95b8df PA |
1215 | struct svr4_info *info = get_svr4_info (); |
1216 | ||
1217 | return ((pc >= info->interp_text_sect_low | |
1218 | && pc < info->interp_text_sect_high) | |
1219 | || (pc >= info->interp_plt_sect_low | |
1220 | && pc < info->interp_plt_sect_high) | |
13437d4b KB |
1221 | || in_plt_section (pc, NULL)); |
1222 | } | |
13437d4b | 1223 | |
2f4950cd AC |
1224 | /* Given an executable's ABFD and target, compute the entry-point |
1225 | address. */ | |
1226 | ||
1227 | static CORE_ADDR | |
1228 | exec_entry_point (struct bfd *abfd, struct target_ops *targ) | |
1229 | { | |
1230 | /* KevinB wrote ... for most targets, the address returned by | |
1231 | bfd_get_start_address() is the entry point for the start | |
1232 | function. But, for some targets, bfd_get_start_address() returns | |
1233 | the address of a function descriptor from which the entry point | |
1234 | address may be extracted. This address is extracted by | |
1235 | gdbarch_convert_from_func_ptr_addr(). The method | |
1236 | gdbarch_convert_from_func_ptr_addr() is the merely the identify | |
1237 | function for targets which don't use function descriptors. */ | |
1cf3db46 | 1238 | return gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
2f4950cd AC |
1239 | bfd_get_start_address (abfd), |
1240 | targ); | |
1241 | } | |
13437d4b KB |
1242 | |
1243 | /* | |
1244 | ||
1245 | LOCAL FUNCTION | |
1246 | ||
1247 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1248 | ||
1249 | SYNOPSIS | |
1250 | ||
1251 | int enable_break (void) | |
1252 | ||
1253 | DESCRIPTION | |
1254 | ||
1255 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1256 | debugger interface, support for arranging for the inferior to hit | |
1257 | a breakpoint after mapping in the shared libraries. This function | |
1258 | enables that breakpoint. | |
1259 | ||
1260 | For SunOS, there is a special flag location (in_debugger) which we | |
1261 | set to 1. When the dynamic linker sees this flag set, it will set | |
1262 | a breakpoint at a location known only to itself, after saving the | |
1263 | original contents of that place and the breakpoint address itself, | |
1264 | in it's own internal structures. When we resume the inferior, it | |
1265 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1266 | We handle this (in a different place) by restoring the contents of | |
1267 | the breakpointed location (which is only known after it stops), | |
1268 | chasing around to locate the shared libraries that have been | |
1269 | loaded, then resuming. | |
1270 | ||
1271 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1272 | which is statically initialized at the time the shared library is | |
1273 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1274 | teed to be called once before mapping in a library, and again when | |
1275 | the mapping is complete. At the time we are examining this member, | |
1276 | it contains only the unrelocated offset of the function, so we have | |
1277 | to do our own relocation. Later, when the dynamic linker actually | |
1278 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1279 | ||
1280 | The debugger interface structure also contains an enumeration which | |
1281 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1282 | depending upon whether or not the library is being mapped or unmapped, | |
1283 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1284 | */ | |
1285 | ||
1286 | static int | |
268a4a75 | 1287 | enable_break (struct svr4_info *info, int from_tty) |
13437d4b | 1288 | { |
13437d4b KB |
1289 | struct minimal_symbol *msymbol; |
1290 | char **bkpt_namep; | |
1291 | asection *interp_sect; | |
97ec2c2f | 1292 | gdb_byte *interp_name; |
7cd25cfc | 1293 | CORE_ADDR sym_addr; |
13437d4b KB |
1294 | |
1295 | /* First, remove all the solib event breakpoints. Their addresses | |
1296 | may have changed since the last time we ran the program. */ | |
1297 | remove_solib_event_breakpoints (); | |
1298 | ||
6c95b8df PA |
1299 | info->interp_text_sect_low = info->interp_text_sect_high = 0; |
1300 | info->interp_plt_sect_low = info->interp_plt_sect_high = 0; | |
13437d4b | 1301 | |
7cd25cfc DJ |
1302 | /* If we already have a shared library list in the target, and |
1303 | r_debug contains r_brk, set the breakpoint there - this should | |
1304 | mean r_brk has already been relocated. Assume the dynamic linker | |
1305 | is the object containing r_brk. */ | |
1306 | ||
268a4a75 | 1307 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
7cd25cfc | 1308 | sym_addr = 0; |
1a816a87 PA |
1309 | if (info->debug_base && solib_svr4_r_map (info) != 0) |
1310 | sym_addr = solib_svr4_r_brk (info); | |
7cd25cfc DJ |
1311 | |
1312 | if (sym_addr != 0) | |
1313 | { | |
1314 | struct obj_section *os; | |
1315 | ||
b36ec657 | 1316 | sym_addr = gdbarch_addr_bits_remove |
1cf3db46 | 1317 | (target_gdbarch, gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
b36ec657 DJ |
1318 | sym_addr, |
1319 | ¤t_target)); | |
1320 | ||
7cd25cfc DJ |
1321 | os = find_pc_section (sym_addr); |
1322 | if (os != NULL) | |
1323 | { | |
1324 | /* Record the relocated start and end address of the dynamic linker | |
1325 | text and plt section for svr4_in_dynsym_resolve_code. */ | |
1326 | bfd *tmp_bfd; | |
1327 | CORE_ADDR load_addr; | |
1328 | ||
1329 | tmp_bfd = os->objfile->obfd; | |
1330 | load_addr = ANOFFSET (os->objfile->section_offsets, | |
1331 | os->objfile->sect_index_text); | |
1332 | ||
1333 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
1334 | if (interp_sect) | |
1335 | { | |
6c95b8df | 1336 | info->interp_text_sect_low = |
7cd25cfc | 1337 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1338 | info->interp_text_sect_high = |
1339 | info->interp_text_sect_low | |
1340 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1341 | } |
1342 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1343 | if (interp_sect) | |
1344 | { | |
6c95b8df | 1345 | info->interp_plt_sect_low = |
7cd25cfc | 1346 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1347 | info->interp_plt_sect_high = |
1348 | info->interp_plt_sect_low | |
1349 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1350 | } |
1351 | ||
a6d9a66e | 1352 | create_solib_event_breakpoint (target_gdbarch, sym_addr); |
7cd25cfc DJ |
1353 | return 1; |
1354 | } | |
1355 | } | |
1356 | ||
97ec2c2f | 1357 | /* Find the program interpreter; if not found, warn the user and drop |
13437d4b | 1358 | into the old breakpoint at symbol code. */ |
97ec2c2f UW |
1359 | interp_name = find_program_interpreter (); |
1360 | if (interp_name) | |
13437d4b | 1361 | { |
8ad2fcde KB |
1362 | CORE_ADDR load_addr = 0; |
1363 | int load_addr_found = 0; | |
2ec9a4f8 | 1364 | int loader_found_in_list = 0; |
f8766ec1 | 1365 | struct so_list *so; |
e4f7b8c8 | 1366 | bfd *tmp_bfd = NULL; |
2f4950cd | 1367 | struct target_ops *tmp_bfd_target; |
f1838a98 | 1368 | volatile struct gdb_exception ex; |
13437d4b | 1369 | |
7cd25cfc | 1370 | sym_addr = 0; |
13437d4b KB |
1371 | |
1372 | /* Now we need to figure out where the dynamic linker was | |
1373 | loaded so that we can load its symbols and place a breakpoint | |
1374 | in the dynamic linker itself. | |
1375 | ||
1376 | This address is stored on the stack. However, I've been unable | |
1377 | to find any magic formula to find it for Solaris (appears to | |
1378 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1379 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 | 1380 | |
f1838a98 UW |
1381 | TRY_CATCH (ex, RETURN_MASK_ALL) |
1382 | { | |
97ec2c2f | 1383 | tmp_bfd = solib_bfd_open (interp_name); |
f1838a98 | 1384 | } |
13437d4b KB |
1385 | if (tmp_bfd == NULL) |
1386 | goto bkpt_at_symbol; | |
1387 | ||
2f4950cd AC |
1388 | /* Now convert the TMP_BFD into a target. That way target, as |
1389 | well as BFD operations can be used. Note that closing the | |
1390 | target will also close the underlying bfd. */ | |
1391 | tmp_bfd_target = target_bfd_reopen (tmp_bfd); | |
1392 | ||
f8766ec1 KB |
1393 | /* On a running target, we can get the dynamic linker's base |
1394 | address from the shared library table. */ | |
f8766ec1 KB |
1395 | so = master_so_list (); |
1396 | while (so) | |
8ad2fcde | 1397 | { |
97ec2c2f | 1398 | if (svr4_same_1 (interp_name, so->so_original_name)) |
8ad2fcde KB |
1399 | { |
1400 | load_addr_found = 1; | |
2ec9a4f8 | 1401 | loader_found_in_list = 1; |
cc10cae3 | 1402 | load_addr = LM_ADDR_CHECK (so, tmp_bfd); |
8ad2fcde KB |
1403 | break; |
1404 | } | |
f8766ec1 | 1405 | so = so->next; |
8ad2fcde KB |
1406 | } |
1407 | ||
8d4e36ba JB |
1408 | /* If we were not able to find the base address of the loader |
1409 | from our so_list, then try using the AT_BASE auxilliary entry. */ | |
1410 | if (!load_addr_found) | |
1411 | if (target_auxv_search (¤t_target, AT_BASE, &load_addr) > 0) | |
1412 | load_addr_found = 1; | |
1413 | ||
8ad2fcde KB |
1414 | /* Otherwise we find the dynamic linker's base address by examining |
1415 | the current pc (which should point at the entry point for the | |
8d4e36ba JB |
1416 | dynamic linker) and subtracting the offset of the entry point. |
1417 | ||
1418 | This is more fragile than the previous approaches, but is a good | |
1419 | fallback method because it has actually been working well in | |
1420 | most cases. */ | |
8ad2fcde | 1421 | if (!load_addr_found) |
fb14de7b | 1422 | { |
c2250ad1 UW |
1423 | struct regcache *regcache |
1424 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch); | |
fb14de7b UW |
1425 | load_addr = (regcache_read_pc (regcache) |
1426 | - exec_entry_point (tmp_bfd, tmp_bfd_target)); | |
1427 | } | |
2ec9a4f8 DJ |
1428 | |
1429 | if (!loader_found_in_list) | |
34439770 | 1430 | { |
1a816a87 PA |
1431 | info->debug_loader_name = xstrdup (interp_name); |
1432 | info->debug_loader_offset_p = 1; | |
1433 | info->debug_loader_offset = load_addr; | |
268a4a75 | 1434 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
34439770 | 1435 | } |
13437d4b KB |
1436 | |
1437 | /* Record the relocated start and end address of the dynamic linker | |
d7fa2ae2 | 1438 | text and plt section for svr4_in_dynsym_resolve_code. */ |
13437d4b KB |
1439 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1440 | if (interp_sect) | |
1441 | { | |
6c95b8df | 1442 | info->interp_text_sect_low = |
13437d4b | 1443 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1444 | info->interp_text_sect_high = |
1445 | info->interp_text_sect_low | |
1446 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1447 | } |
1448 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1449 | if (interp_sect) | |
1450 | { | |
6c95b8df | 1451 | info->interp_plt_sect_low = |
13437d4b | 1452 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1453 | info->interp_plt_sect_high = |
1454 | info->interp_plt_sect_low | |
1455 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1456 | } |
1457 | ||
1458 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1459 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1460 | { | |
2bbe3cc1 | 1461 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); |
13437d4b KB |
1462 | if (sym_addr != 0) |
1463 | break; | |
1464 | } | |
1465 | ||
2bbe3cc1 DJ |
1466 | if (sym_addr != 0) |
1467 | /* Convert 'sym_addr' from a function pointer to an address. | |
1468 | Because we pass tmp_bfd_target instead of the current | |
1469 | target, this will always produce an unrelocated value. */ | |
1cf3db46 | 1470 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
2bbe3cc1 DJ |
1471 | sym_addr, |
1472 | tmp_bfd_target); | |
1473 | ||
2f4950cd AC |
1474 | /* We're done with both the temporary bfd and target. Remember, |
1475 | closing the target closes the underlying bfd. */ | |
1476 | target_close (tmp_bfd_target, 0); | |
13437d4b KB |
1477 | |
1478 | if (sym_addr != 0) | |
1479 | { | |
a6d9a66e | 1480 | create_solib_event_breakpoint (target_gdbarch, load_addr + sym_addr); |
97ec2c2f | 1481 | xfree (interp_name); |
13437d4b KB |
1482 | return 1; |
1483 | } | |
1484 | ||
1485 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1486 | linker. Warn and drop into the old code. */ | |
1487 | bkpt_at_symbol: | |
97ec2c2f | 1488 | xfree (interp_name); |
82d03102 PG |
1489 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
1490 | "GDB will be unable to debug shared library initializers\n" | |
1491 | "and track explicitly loaded dynamic code.")); | |
13437d4b | 1492 | } |
13437d4b | 1493 | |
e499d0f1 DJ |
1494 | /* Scan through the lists of symbols, trying to look up the symbol and |
1495 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1496 | ||
1497 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1498 | { | |
1499 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1500 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1501 | { | |
de64a9ac JM |
1502 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
1503 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, | |
1504 | sym_addr, | |
1505 | ¤t_target); | |
1506 | create_solib_event_breakpoint (target_gdbarch, sym_addr); | |
e499d0f1 DJ |
1507 | return 1; |
1508 | } | |
1509 | } | |
13437d4b | 1510 | |
13437d4b KB |
1511 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) |
1512 | { | |
1513 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1514 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1515 | { | |
de64a9ac JM |
1516 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
1517 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, | |
1518 | sym_addr, | |
1519 | ¤t_target); | |
1520 | create_solib_event_breakpoint (target_gdbarch, sym_addr); | |
13437d4b KB |
1521 | return 1; |
1522 | } | |
1523 | } | |
542c95c2 | 1524 | return 0; |
13437d4b KB |
1525 | } |
1526 | ||
1527 | /* | |
1528 | ||
1529 | LOCAL FUNCTION | |
1530 | ||
1531 | special_symbol_handling -- additional shared library symbol handling | |
1532 | ||
1533 | SYNOPSIS | |
1534 | ||
1535 | void special_symbol_handling () | |
1536 | ||
1537 | DESCRIPTION | |
1538 | ||
1539 | Once the symbols from a shared object have been loaded in the usual | |
1540 | way, we are called to do any system specific symbol handling that | |
1541 | is needed. | |
1542 | ||
ab31aa69 | 1543 | For SunOS4, this consisted of grunging around in the dynamic |
13437d4b KB |
1544 | linkers structures to find symbol definitions for "common" symbols |
1545 | and adding them to the minimal symbol table for the runtime common | |
1546 | objfile. | |
1547 | ||
ab31aa69 KB |
1548 | However, for SVR4, there's nothing to do. |
1549 | ||
13437d4b KB |
1550 | */ |
1551 | ||
1552 | static void | |
1553 | svr4_special_symbol_handling (void) | |
1554 | { | |
9f2982ff | 1555 | svr4_relocate_main_executable (); |
13437d4b KB |
1556 | } |
1557 | ||
b8040f19 JK |
1558 | /* Decide if the objfile needs to be relocated. As indicated above, |
1559 | we will only be here when execution is stopped at the beginning | |
1560 | of the program. Relocation is necessary if the address at which | |
1561 | we are presently stopped differs from the start address stored in | |
1562 | the executable AND there's no interpreter section. The condition | |
1563 | regarding the interpreter section is very important because if | |
1564 | there *is* an interpreter section, execution will begin there | |
1565 | instead. When there is an interpreter section, the start address | |
1566 | is (presumably) used by the interpreter at some point to start | |
1567 | execution of the program. | |
1568 | ||
1569 | If there is an interpreter, it is normal for it to be set to an | |
1570 | arbitrary address at the outset. The job of finding it is | |
1571 | handled in enable_break(). | |
1572 | ||
1573 | So, to summarize, relocations are necessary when there is no | |
1574 | interpreter section and the start address obtained from the | |
1575 | executable is different from the address at which GDB is | |
1576 | currently stopped. | |
e2a44558 | 1577 | |
b8040f19 JK |
1578 | [ The astute reader will note that we also test to make sure that |
1579 | the executable in question has the DYNAMIC flag set. It is my | |
1580 | opinion that this test is unnecessary (undesirable even). It | |
1581 | was added to avoid inadvertent relocation of an executable | |
1582 | whose e_type member in the ELF header is not ET_DYN. There may | |
1583 | be a time in the future when it is desirable to do relocations | |
1584 | on other types of files as well in which case this condition | |
1585 | should either be removed or modified to accomodate the new file | |
1586 | type. (E.g, an ET_EXEC executable which has been built to be | |
1587 | position-independent could safely be relocated by the OS if | |
1588 | desired. It is true that this violates the ABI, but the ABI | |
1589 | has been known to be bent from time to time.) - Kevin, Nov 2000. ] | |
1590 | */ | |
e2a44558 | 1591 | |
b8040f19 JK |
1592 | static CORE_ADDR |
1593 | svr4_static_exec_displacement (void) | |
e2a44558 KB |
1594 | { |
1595 | asection *interp_sect; | |
c2250ad1 UW |
1596 | struct regcache *regcache |
1597 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch); | |
fb14de7b | 1598 | CORE_ADDR pc = regcache_read_pc (regcache); |
e2a44558 | 1599 | |
e2a44558 KB |
1600 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); |
1601 | if (interp_sect == NULL | |
1602 | && (bfd_get_file_flags (exec_bfd) & DYNAMIC) != 0 | |
2f4950cd | 1603 | && (exec_entry_point (exec_bfd, &exec_ops) != pc)) |
b8040f19 JK |
1604 | return pc - exec_entry_point (exec_bfd, &exec_ops); |
1605 | ||
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | /* We relocate all of the sections by the same amount. This | |
1610 | behavior is mandated by recent editions of the System V ABI. | |
1611 | According to the System V Application Binary Interface, | |
1612 | Edition 4.1, page 5-5: | |
1613 | ||
1614 | ... Though the system chooses virtual addresses for | |
1615 | individual processes, it maintains the segments' relative | |
1616 | positions. Because position-independent code uses relative | |
1617 | addressesing between segments, the difference between | |
1618 | virtual addresses in memory must match the difference | |
1619 | between virtual addresses in the file. The difference | |
1620 | between the virtual address of any segment in memory and | |
1621 | the corresponding virtual address in the file is thus a | |
1622 | single constant value for any one executable or shared | |
1623 | object in a given process. This difference is the base | |
1624 | address. One use of the base address is to relocate the | |
1625 | memory image of the program during dynamic linking. | |
1626 | ||
1627 | The same language also appears in Edition 4.0 of the System V | |
1628 | ABI and is left unspecified in some of the earlier editions. */ | |
1629 | ||
1630 | static CORE_ADDR | |
1631 | svr4_exec_displacement (void) | |
1632 | { | |
1633 | int found; | |
41752192 JK |
1634 | /* ENTRY_POINT is a possible function descriptor - before |
1635 | a call to gdbarch_convert_from_func_ptr_addr. */ | |
b8040f19 JK |
1636 | CORE_ADDR entry_point; |
1637 | ||
1638 | if (exec_bfd == NULL) | |
1639 | return 0; | |
1640 | ||
1641 | if (target_auxv_search (¤t_target, AT_ENTRY, &entry_point) == 1) | |
41752192 | 1642 | return entry_point - bfd_get_start_address (exec_bfd); |
b8040f19 JK |
1643 | |
1644 | return svr4_static_exec_displacement (); | |
1645 | } | |
1646 | ||
1647 | /* Relocate the main executable. This function should be called upon | |
1648 | stopping the inferior process at the entry point to the program. | |
1649 | The entry point from BFD is compared to the AT_ENTRY of AUXV and if they are | |
1650 | different, the main executable is relocated by the proper amount. */ | |
1651 | ||
1652 | static void | |
1653 | svr4_relocate_main_executable (void) | |
1654 | { | |
1655 | CORE_ADDR displacement = svr4_exec_displacement (); | |
1656 | ||
1657 | /* Even if DISPLACEMENT is 0 still try to relocate it as this is a new | |
1658 | difference of in-memory vs. in-file addresses and we could already | |
1659 | relocate the executable at this function to improper address before. */ | |
1660 | ||
1661 | if (symfile_objfile) | |
e2a44558 | 1662 | { |
e2a44558 | 1663 | struct section_offsets *new_offsets; |
b8040f19 | 1664 | int i; |
e2a44558 | 1665 | |
b8040f19 JK |
1666 | new_offsets = alloca (symfile_objfile->num_sections |
1667 | * sizeof (*new_offsets)); | |
e2a44558 | 1668 | |
b8040f19 JK |
1669 | for (i = 0; i < symfile_objfile->num_sections; i++) |
1670 | new_offsets->offsets[i] = displacement; | |
e2a44558 | 1671 | |
b8040f19 | 1672 | objfile_relocate (symfile_objfile, new_offsets); |
e2a44558 | 1673 | } |
51bee8e9 JK |
1674 | else if (exec_bfd) |
1675 | { | |
1676 | asection *asect; | |
1677 | ||
1678 | for (asect = exec_bfd->sections; asect != NULL; asect = asect->next) | |
1679 | exec_set_section_address (bfd_get_filename (exec_bfd), asect->index, | |
1680 | (bfd_section_vma (exec_bfd, asect) | |
1681 | + displacement)); | |
1682 | } | |
e2a44558 KB |
1683 | } |
1684 | ||
13437d4b KB |
1685 | /* |
1686 | ||
1687 | GLOBAL FUNCTION | |
1688 | ||
1689 | svr4_solib_create_inferior_hook -- shared library startup support | |
1690 | ||
1691 | SYNOPSIS | |
1692 | ||
268a4a75 | 1693 | void svr4_solib_create_inferior_hook (int from_tty) |
13437d4b KB |
1694 | |
1695 | DESCRIPTION | |
1696 | ||
1697 | When gdb starts up the inferior, it nurses it along (through the | |
1698 | shell) until it is ready to execute it's first instruction. At this | |
1699 | point, this function gets called via expansion of the macro | |
1700 | SOLIB_CREATE_INFERIOR_HOOK. | |
1701 | ||
1702 | For SunOS executables, this first instruction is typically the | |
1703 | one at "_start", or a similar text label, regardless of whether | |
1704 | the executable is statically or dynamically linked. The runtime | |
1705 | startup code takes care of dynamically linking in any shared | |
1706 | libraries, once gdb allows the inferior to continue. | |
1707 | ||
1708 | For SVR4 executables, this first instruction is either the first | |
1709 | instruction in the dynamic linker (for dynamically linked | |
1710 | executables) or the instruction at "start" for statically linked | |
1711 | executables. For dynamically linked executables, the system | |
1712 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1713 | and starts it running. The dynamic linker maps in any needed | |
1714 | shared libraries, maps in the actual user executable, and then | |
1715 | jumps to "start" in the user executable. | |
1716 | ||
1717 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1718 | can arrange to cooperate with the dynamic linker to discover the | |
1719 | names of shared libraries that are dynamically linked, and the | |
1720 | base addresses to which they are linked. | |
1721 | ||
1722 | This function is responsible for discovering those names and | |
1723 | addresses, and saving sufficient information about them to allow | |
1724 | their symbols to be read at a later time. | |
1725 | ||
1726 | FIXME | |
1727 | ||
1728 | Between enable_break() and disable_break(), this code does not | |
1729 | properly handle hitting breakpoints which the user might have | |
1730 | set in the startup code or in the dynamic linker itself. Proper | |
1731 | handling will probably have to wait until the implementation is | |
1732 | changed to use the "breakpoint handler function" method. | |
1733 | ||
1734 | Also, what if child has exit()ed? Must exit loop somehow. | |
1735 | */ | |
1736 | ||
e2a44558 | 1737 | static void |
268a4a75 | 1738 | svr4_solib_create_inferior_hook (int from_tty) |
13437d4b | 1739 | { |
d6b48e9c | 1740 | struct inferior *inf; |
2020b7ab | 1741 | struct thread_info *tp; |
1a816a87 PA |
1742 | struct svr4_info *info; |
1743 | ||
6c95b8df | 1744 | info = get_svr4_info (); |
2020b7ab | 1745 | |
e2a44558 | 1746 | /* Relocate the main executable if necessary. */ |
9f2982ff JK |
1747 | if (current_inferior ()->attach_flag == 0) |
1748 | svr4_relocate_main_executable (); | |
e2a44558 | 1749 | |
d5a921c9 | 1750 | if (!svr4_have_link_map_offsets ()) |
513f5903 | 1751 | return; |
d5a921c9 | 1752 | |
268a4a75 | 1753 | if (!enable_break (info, from_tty)) |
542c95c2 | 1754 | return; |
13437d4b | 1755 | |
ab31aa69 KB |
1756 | #if defined(_SCO_DS) |
1757 | /* SCO needs the loop below, other systems should be using the | |
13437d4b KB |
1758 | special shared library breakpoints and the shared library breakpoint |
1759 | service routine. | |
1760 | ||
1761 | Now run the target. It will eventually hit the breakpoint, at | |
1762 | which point all of the libraries will have been mapped in and we | |
1763 | can go groveling around in the dynamic linker structures to find | |
1764 | out what we need to know about them. */ | |
1765 | ||
d6b48e9c | 1766 | inf = current_inferior (); |
2020b7ab PA |
1767 | tp = inferior_thread (); |
1768 | ||
13437d4b | 1769 | clear_proceed_status (); |
d6b48e9c | 1770 | inf->stop_soon = STOP_QUIETLY; |
2020b7ab | 1771 | tp->stop_signal = TARGET_SIGNAL_0; |
13437d4b KB |
1772 | do |
1773 | { | |
2020b7ab | 1774 | target_resume (pid_to_ptid (-1), 0, tp->stop_signal); |
ae123ec6 | 1775 | wait_for_inferior (0); |
13437d4b | 1776 | } |
2020b7ab | 1777 | while (tp->stop_signal != TARGET_SIGNAL_TRAP); |
d6b48e9c | 1778 | inf->stop_soon = NO_STOP_QUIETLY; |
ab31aa69 | 1779 | #endif /* defined(_SCO_DS) */ |
13437d4b KB |
1780 | } |
1781 | ||
1782 | static void | |
1783 | svr4_clear_solib (void) | |
1784 | { | |
6c95b8df PA |
1785 | struct svr4_info *info; |
1786 | ||
1787 | info = get_svr4_info (); | |
1788 | info->debug_base = 0; | |
1789 | info->debug_loader_offset_p = 0; | |
1790 | info->debug_loader_offset = 0; | |
1791 | xfree (info->debug_loader_name); | |
1792 | info->debug_loader_name = NULL; | |
13437d4b KB |
1793 | } |
1794 | ||
1795 | static void | |
1796 | svr4_free_so (struct so_list *so) | |
1797 | { | |
b8c9b27d KB |
1798 | xfree (so->lm_info->lm); |
1799 | xfree (so->lm_info); | |
13437d4b KB |
1800 | } |
1801 | ||
6bb7be43 JB |
1802 | |
1803 | /* Clear any bits of ADDR that wouldn't fit in a target-format | |
1804 | data pointer. "Data pointer" here refers to whatever sort of | |
1805 | address the dynamic linker uses to manage its sections. At the | |
1806 | moment, we don't support shared libraries on any processors where | |
1807 | code and data pointers are different sizes. | |
1808 | ||
1809 | This isn't really the right solution. What we really need here is | |
1810 | a way to do arithmetic on CORE_ADDR values that respects the | |
1811 | natural pointer/address correspondence. (For example, on the MIPS, | |
1812 | converting a 32-bit pointer to a 64-bit CORE_ADDR requires you to | |
1813 | sign-extend the value. There, simply truncating the bits above | |
819844ad | 1814 | gdbarch_ptr_bit, as we do below, is no good.) This should probably |
6bb7be43 JB |
1815 | be a new gdbarch method or something. */ |
1816 | static CORE_ADDR | |
1817 | svr4_truncate_ptr (CORE_ADDR addr) | |
1818 | { | |
1cf3db46 | 1819 | if (gdbarch_ptr_bit (target_gdbarch) == sizeof (CORE_ADDR) * 8) |
6bb7be43 JB |
1820 | /* We don't need to truncate anything, and the bit twiddling below |
1821 | will fail due to overflow problems. */ | |
1822 | return addr; | |
1823 | else | |
1cf3db46 | 1824 | return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch)) - 1); |
6bb7be43 JB |
1825 | } |
1826 | ||
1827 | ||
749499cb KB |
1828 | static void |
1829 | svr4_relocate_section_addresses (struct so_list *so, | |
0542c86d | 1830 | struct target_section *sec) |
749499cb | 1831 | { |
cc10cae3 AO |
1832 | sec->addr = svr4_truncate_ptr (sec->addr + LM_ADDR_CHECK (so, |
1833 | sec->bfd)); | |
1834 | sec->endaddr = svr4_truncate_ptr (sec->endaddr + LM_ADDR_CHECK (so, | |
1835 | sec->bfd)); | |
749499cb | 1836 | } |
4b188b9f | 1837 | \f |
749499cb | 1838 | |
4b188b9f | 1839 | /* Architecture-specific operations. */ |
6bb7be43 | 1840 | |
4b188b9f MK |
1841 | /* Per-architecture data key. */ |
1842 | static struct gdbarch_data *solib_svr4_data; | |
e5e2b9ff | 1843 | |
4b188b9f | 1844 | struct solib_svr4_ops |
e5e2b9ff | 1845 | { |
4b188b9f MK |
1846 | /* Return a description of the layout of `struct link_map'. */ |
1847 | struct link_map_offsets *(*fetch_link_map_offsets)(void); | |
1848 | }; | |
e5e2b9ff | 1849 | |
4b188b9f | 1850 | /* Return a default for the architecture-specific operations. */ |
e5e2b9ff | 1851 | |
4b188b9f MK |
1852 | static void * |
1853 | solib_svr4_init (struct obstack *obstack) | |
e5e2b9ff | 1854 | { |
4b188b9f | 1855 | struct solib_svr4_ops *ops; |
e5e2b9ff | 1856 | |
4b188b9f | 1857 | ops = OBSTACK_ZALLOC (obstack, struct solib_svr4_ops); |
8d005789 | 1858 | ops->fetch_link_map_offsets = NULL; |
4b188b9f | 1859 | return ops; |
e5e2b9ff KB |
1860 | } |
1861 | ||
4b188b9f | 1862 | /* Set the architecture-specific `struct link_map_offsets' fetcher for |
7e3cb44c | 1863 | GDBARCH to FLMO. Also, install SVR4 solib_ops into GDBARCH. */ |
1c4dcb57 | 1864 | |
21479ded | 1865 | void |
e5e2b9ff KB |
1866 | set_solib_svr4_fetch_link_map_offsets (struct gdbarch *gdbarch, |
1867 | struct link_map_offsets *(*flmo) (void)) | |
21479ded | 1868 | { |
4b188b9f MK |
1869 | struct solib_svr4_ops *ops = gdbarch_data (gdbarch, solib_svr4_data); |
1870 | ||
1871 | ops->fetch_link_map_offsets = flmo; | |
7e3cb44c UW |
1872 | |
1873 | set_solib_ops (gdbarch, &svr4_so_ops); | |
21479ded KB |
1874 | } |
1875 | ||
4b188b9f MK |
1876 | /* Fetch a link_map_offsets structure using the architecture-specific |
1877 | `struct link_map_offsets' fetcher. */ | |
1c4dcb57 | 1878 | |
4b188b9f MK |
1879 | static struct link_map_offsets * |
1880 | svr4_fetch_link_map_offsets (void) | |
21479ded | 1881 | { |
1cf3db46 | 1882 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data); |
4b188b9f MK |
1883 | |
1884 | gdb_assert (ops->fetch_link_map_offsets); | |
1885 | return ops->fetch_link_map_offsets (); | |
21479ded KB |
1886 | } |
1887 | ||
4b188b9f MK |
1888 | /* Return 1 if a link map offset fetcher has been defined, 0 otherwise. */ |
1889 | ||
1890 | static int | |
1891 | svr4_have_link_map_offsets (void) | |
1892 | { | |
1cf3db46 | 1893 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data); |
4b188b9f MK |
1894 | return (ops->fetch_link_map_offsets != NULL); |
1895 | } | |
1896 | \f | |
1897 | ||
e4bbbda8 MK |
1898 | /* Most OS'es that have SVR4-style ELF dynamic libraries define a |
1899 | `struct r_debug' and a `struct link_map' that are binary compatible | |
1900 | with the origional SVR4 implementation. */ | |
1901 | ||
1902 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
1903 | for an ILP32 SVR4 system. */ | |
1904 | ||
1905 | struct link_map_offsets * | |
1906 | svr4_ilp32_fetch_link_map_offsets (void) | |
1907 | { | |
1908 | static struct link_map_offsets lmo; | |
1909 | static struct link_map_offsets *lmp = NULL; | |
1910 | ||
1911 | if (lmp == NULL) | |
1912 | { | |
1913 | lmp = &lmo; | |
1914 | ||
e4cd0d6a MK |
1915 | lmo.r_version_offset = 0; |
1916 | lmo.r_version_size = 4; | |
e4bbbda8 | 1917 | lmo.r_map_offset = 4; |
7cd25cfc | 1918 | lmo.r_brk_offset = 8; |
e4cd0d6a | 1919 | lmo.r_ldsomap_offset = 20; |
e4bbbda8 MK |
1920 | |
1921 | /* Everything we need is in the first 20 bytes. */ | |
1922 | lmo.link_map_size = 20; | |
1923 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 1924 | lmo.l_name_offset = 4; |
cc10cae3 | 1925 | lmo.l_ld_offset = 8; |
e4bbbda8 | 1926 | lmo.l_next_offset = 12; |
e4bbbda8 | 1927 | lmo.l_prev_offset = 16; |
e4bbbda8 MK |
1928 | } |
1929 | ||
1930 | return lmp; | |
1931 | } | |
1932 | ||
1933 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
1934 | for an LP64 SVR4 system. */ | |
1935 | ||
1936 | struct link_map_offsets * | |
1937 | svr4_lp64_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 = 8; |
7cd25cfc | 1949 | lmo.r_brk_offset = 16; |
e4cd0d6a | 1950 | lmo.r_ldsomap_offset = 40; |
e4bbbda8 MK |
1951 | |
1952 | /* Everything we need is in the first 40 bytes. */ | |
1953 | lmo.link_map_size = 40; | |
1954 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 1955 | lmo.l_name_offset = 8; |
cc10cae3 | 1956 | lmo.l_ld_offset = 16; |
e4bbbda8 | 1957 | lmo.l_next_offset = 24; |
e4bbbda8 | 1958 | lmo.l_prev_offset = 32; |
e4bbbda8 MK |
1959 | } |
1960 | ||
1961 | return lmp; | |
1962 | } | |
1963 | \f | |
1964 | ||
7d522c90 | 1965 | struct target_so_ops svr4_so_ops; |
13437d4b | 1966 | |
3a40aaa0 UW |
1967 | /* Lookup global symbol for ELF DSOs linked with -Bsymbolic. Those DSOs have a |
1968 | different rule for symbol lookup. The lookup begins here in the DSO, not in | |
1969 | the main executable. */ | |
1970 | ||
1971 | static struct symbol * | |
1972 | elf_lookup_lib_symbol (const struct objfile *objfile, | |
1973 | const char *name, | |
1974 | const char *linkage_name, | |
21b556f4 | 1975 | const domain_enum domain) |
3a40aaa0 | 1976 | { |
61f0d762 JK |
1977 | bfd *abfd; |
1978 | ||
1979 | if (objfile == symfile_objfile) | |
1980 | abfd = exec_bfd; | |
1981 | else | |
1982 | { | |
1983 | /* OBJFILE should have been passed as the non-debug one. */ | |
1984 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
1985 | ||
1986 | abfd = objfile->obfd; | |
1987 | } | |
1988 | ||
1989 | if (abfd == NULL || scan_dyntag (DT_SYMBOLIC, abfd, NULL) != 1) | |
3a40aaa0 UW |
1990 | return NULL; |
1991 | ||
65728c26 | 1992 | return lookup_global_symbol_from_objfile |
21b556f4 | 1993 | (objfile, name, linkage_name, domain); |
3a40aaa0 UW |
1994 | } |
1995 | ||
a78f21af AC |
1996 | extern initialize_file_ftype _initialize_svr4_solib; /* -Wmissing-prototypes */ |
1997 | ||
13437d4b KB |
1998 | void |
1999 | _initialize_svr4_solib (void) | |
2000 | { | |
4b188b9f | 2001 | solib_svr4_data = gdbarch_data_register_pre_init (solib_svr4_init); |
6c95b8df PA |
2002 | solib_svr4_pspace_data |
2003 | = register_program_space_data_with_cleanup (svr4_pspace_data_cleanup); | |
4b188b9f | 2004 | |
749499cb | 2005 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b KB |
2006 | svr4_so_ops.free_so = svr4_free_so; |
2007 | svr4_so_ops.clear_solib = svr4_clear_solib; | |
2008 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
2009 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |
2010 | svr4_so_ops.current_sos = svr4_current_sos; | |
2011 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
d7fa2ae2 | 2012 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; |
831a0c44 | 2013 | svr4_so_ops.bfd_open = solib_bfd_open; |
3a40aaa0 | 2014 | svr4_so_ops.lookup_lib_global_symbol = elf_lookup_lib_symbol; |
a7c02bc8 | 2015 | svr4_so_ops.same = svr4_same; |
de18c1d8 | 2016 | svr4_so_ops.keep_data_in_core = svr4_keep_data_in_core; |
13437d4b | 2017 | } |