Commit | Line | Data |
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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, |
0fb0cc75 JB |
4 | 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
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); |
1c4dcb57 | 53 | |
13437d4b KB |
54 | /* Link map info to include in an allocated so_list entry */ |
55 | ||
56 | struct lm_info | |
57 | { | |
58 | /* Pointer to copy of link map from inferior. The type is char * | |
59 | rather than void *, so that we may use byte offsets to find the | |
60 | various fields without the need for a cast. */ | |
4066fc10 | 61 | gdb_byte *lm; |
cc10cae3 AO |
62 | |
63 | /* Amount by which addresses in the binary should be relocated to | |
64 | match the inferior. This could most often be taken directly | |
65 | from lm, but when prelinking is involved and the prelink base | |
66 | address changes, we may need a different offset, we want to | |
67 | warn about the difference and compute it only once. */ | |
68 | CORE_ADDR l_addr; | |
93a57060 DJ |
69 | |
70 | /* The target location of lm. */ | |
71 | CORE_ADDR lm_addr; | |
13437d4b KB |
72 | }; |
73 | ||
74 | /* On SVR4 systems, a list of symbols in the dynamic linker where | |
75 | GDB can try to place a breakpoint to monitor shared library | |
76 | events. | |
77 | ||
78 | If none of these symbols are found, or other errors occur, then | |
79 | SVR4 systems will fall back to using a symbol as the "startup | |
80 | mapping complete" breakpoint address. */ | |
81 | ||
13437d4b KB |
82 | static char *solib_break_names[] = |
83 | { | |
84 | "r_debug_state", | |
85 | "_r_debug_state", | |
86 | "_dl_debug_state", | |
87 | "rtld_db_dlactivity", | |
1f72e589 | 88 | "_rtld_debug_state", |
4c0122c8 | 89 | |
13437d4b KB |
90 | NULL |
91 | }; | |
13437d4b | 92 | |
13437d4b KB |
93 | static char *bkpt_names[] = |
94 | { | |
13437d4b | 95 | "_start", |
ad3dcc5c | 96 | "__start", |
13437d4b KB |
97 | "main", |
98 | NULL | |
99 | }; | |
13437d4b | 100 | |
13437d4b KB |
101 | static char *main_name_list[] = |
102 | { | |
103 | "main_$main", | |
104 | NULL | |
105 | }; | |
106 | ||
4d7b2d5b JB |
107 | /* Return non-zero if GDB_SO_NAME and INFERIOR_SO_NAME represent |
108 | the same shared library. */ | |
109 | ||
110 | static int | |
111 | svr4_same_1 (const char *gdb_so_name, const char *inferior_so_name) | |
112 | { | |
113 | if (strcmp (gdb_so_name, inferior_so_name) == 0) | |
114 | return 1; | |
115 | ||
116 | /* On Solaris, when starting inferior we think that dynamic linker is | |
117 | /usr/lib/ld.so.1, but later on, the table of loaded shared libraries | |
118 | contains /lib/ld.so.1. Sometimes one file is a link to another, but | |
119 | sometimes they have identical content, but are not linked to each | |
120 | other. We don't restrict this check for Solaris, but the chances | |
121 | of running into this situation elsewhere are very low. */ | |
122 | if (strcmp (gdb_so_name, "/usr/lib/ld.so.1") == 0 | |
123 | && strcmp (inferior_so_name, "/lib/ld.so.1") == 0) | |
124 | return 1; | |
125 | ||
126 | /* Similarly, we observed the same issue with sparc64, but with | |
127 | different locations. */ | |
128 | if (strcmp (gdb_so_name, "/usr/lib/sparcv9/ld.so.1") == 0 | |
129 | && strcmp (inferior_so_name, "/lib/sparcv9/ld.so.1") == 0) | |
130 | return 1; | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | static int | |
136 | svr4_same (struct so_list *gdb, struct so_list *inferior) | |
137 | { | |
138 | return (svr4_same_1 (gdb->so_original_name, inferior->so_original_name)); | |
139 | } | |
140 | ||
13437d4b KB |
141 | /* link map access functions */ |
142 | ||
143 | static CORE_ADDR | |
cc10cae3 | 144 | LM_ADDR_FROM_LINK_MAP (struct so_list *so) |
13437d4b | 145 | { |
4b188b9f | 146 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 147 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 148 | |
cfaefc65 | 149 | return extract_typed_address (so->lm_info->lm + lmo->l_addr_offset, |
b6da22b0 | 150 | ptr_type); |
13437d4b KB |
151 | } |
152 | ||
cc10cae3 | 153 | static int |
2c0b251b | 154 | HAS_LM_DYNAMIC_FROM_LINK_MAP (void) |
cc10cae3 AO |
155 | { |
156 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
157 | ||
cfaefc65 | 158 | return lmo->l_ld_offset >= 0; |
cc10cae3 AO |
159 | } |
160 | ||
161 | static CORE_ADDR | |
162 | LM_DYNAMIC_FROM_LINK_MAP (struct so_list *so) | |
163 | { | |
164 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 165 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
cc10cae3 | 166 | |
cfaefc65 | 167 | return extract_typed_address (so->lm_info->lm + lmo->l_ld_offset, |
b6da22b0 | 168 | ptr_type); |
cc10cae3 AO |
169 | } |
170 | ||
171 | static CORE_ADDR | |
172 | LM_ADDR_CHECK (struct so_list *so, bfd *abfd) | |
173 | { | |
174 | if (so->lm_info->l_addr == (CORE_ADDR)-1) | |
175 | { | |
176 | struct bfd_section *dyninfo_sect; | |
177 | CORE_ADDR l_addr, l_dynaddr, dynaddr, align = 0x1000; | |
178 | ||
179 | l_addr = LM_ADDR_FROM_LINK_MAP (so); | |
180 | ||
181 | if (! abfd || ! HAS_LM_DYNAMIC_FROM_LINK_MAP ()) | |
182 | goto set_addr; | |
183 | ||
184 | l_dynaddr = LM_DYNAMIC_FROM_LINK_MAP (so); | |
185 | ||
186 | dyninfo_sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
187 | if (dyninfo_sect == NULL) | |
188 | goto set_addr; | |
189 | ||
190 | dynaddr = bfd_section_vma (abfd, dyninfo_sect); | |
191 | ||
192 | if (dynaddr + l_addr != l_dynaddr) | |
193 | { | |
cc10cae3 AO |
194 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
195 | { | |
196 | Elf_Internal_Ehdr *ehdr = elf_tdata (abfd)->elf_header; | |
197 | Elf_Internal_Phdr *phdr = elf_tdata (abfd)->phdr; | |
198 | int i; | |
199 | ||
200 | align = 1; | |
201 | ||
202 | for (i = 0; i < ehdr->e_phnum; i++) | |
203 | if (phdr[i].p_type == PT_LOAD && phdr[i].p_align > align) | |
204 | align = phdr[i].p_align; | |
205 | } | |
206 | ||
207 | /* Turn it into a mask. */ | |
208 | align--; | |
209 | ||
210 | /* If the changes match the alignment requirements, we | |
211 | assume we're using a core file that was generated by the | |
212 | same binary, just prelinked with a different base offset. | |
213 | If it doesn't match, we may have a different binary, the | |
214 | same binary with the dynamic table loaded at an unrelated | |
215 | location, or anything, really. To avoid regressions, | |
216 | don't adjust the base offset in the latter case, although | |
217 | odds are that, if things really changed, debugging won't | |
218 | quite work. */ | |
f1e55806 | 219 | if ((l_addr & align) == ((l_dynaddr - dynaddr) & align)) |
cc10cae3 AO |
220 | { |
221 | l_addr = l_dynaddr - dynaddr; | |
79d4c408 DJ |
222 | |
223 | warning (_(".dynamic section for \"%s\" " | |
224 | "is not at the expected address"), so->so_name); | |
cc10cae3 AO |
225 | warning (_("difference appears to be caused by prelink, " |
226 | "adjusting expectations")); | |
227 | } | |
79d4c408 DJ |
228 | else |
229 | warning (_(".dynamic section for \"%s\" " | |
230 | "is not at the expected address " | |
231 | "(wrong library or version mismatch?)"), so->so_name); | |
cc10cae3 AO |
232 | } |
233 | ||
234 | set_addr: | |
235 | so->lm_info->l_addr = l_addr; | |
236 | } | |
237 | ||
238 | return so->lm_info->l_addr; | |
239 | } | |
240 | ||
13437d4b KB |
241 | static CORE_ADDR |
242 | LM_NEXT (struct so_list *so) | |
243 | { | |
4b188b9f | 244 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 245 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 246 | |
cfaefc65 | 247 | return extract_typed_address (so->lm_info->lm + lmo->l_next_offset, |
b6da22b0 | 248 | ptr_type); |
13437d4b KB |
249 | } |
250 | ||
251 | static CORE_ADDR | |
252 | LM_NAME (struct so_list *so) | |
253 | { | |
4b188b9f | 254 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 255 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 256 | |
cfaefc65 | 257 | return extract_typed_address (so->lm_info->lm + lmo->l_name_offset, |
b6da22b0 | 258 | ptr_type); |
13437d4b KB |
259 | } |
260 | ||
13437d4b KB |
261 | static int |
262 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
263 | { | |
4b188b9f | 264 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 265 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 266 | |
e499d0f1 DJ |
267 | /* Assume that everything is a library if the dynamic loader was loaded |
268 | late by a static executable. */ | |
0763ab81 | 269 | if (exec_bfd && bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL) |
e499d0f1 DJ |
270 | return 0; |
271 | ||
cfaefc65 | 272 | return extract_typed_address (so->lm_info->lm + lmo->l_prev_offset, |
b6da22b0 | 273 | ptr_type) == 0; |
13437d4b KB |
274 | } |
275 | ||
6c95b8df | 276 | /* Per pspace SVR4 specific data. */ |
13437d4b | 277 | |
1a816a87 PA |
278 | struct svr4_info |
279 | { | |
1a816a87 PA |
280 | CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
281 | ||
282 | /* Validity flag for debug_loader_offset. */ | |
283 | int debug_loader_offset_p; | |
284 | ||
285 | /* Load address for the dynamic linker, inferred. */ | |
286 | CORE_ADDR debug_loader_offset; | |
287 | ||
288 | /* Name of the dynamic linker, valid if debug_loader_offset_p. */ | |
289 | char *debug_loader_name; | |
290 | ||
291 | /* Load map address for the main executable. */ | |
292 | CORE_ADDR main_lm_addr; | |
1a816a87 | 293 | |
6c95b8df PA |
294 | CORE_ADDR interp_text_sect_low; |
295 | CORE_ADDR interp_text_sect_high; | |
296 | CORE_ADDR interp_plt_sect_low; | |
297 | CORE_ADDR interp_plt_sect_high; | |
298 | }; | |
1a816a87 | 299 | |
6c95b8df PA |
300 | /* Per-program-space data key. */ |
301 | static const struct program_space_data *solib_svr4_pspace_data; | |
1a816a87 | 302 | |
6c95b8df PA |
303 | static void |
304 | svr4_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
1a816a87 | 305 | { |
6c95b8df | 306 | struct svr4_info *info; |
1a816a87 | 307 | |
6c95b8df PA |
308 | info = program_space_data (pspace, solib_svr4_pspace_data); |
309 | xfree (info); | |
1a816a87 PA |
310 | } |
311 | ||
6c95b8df PA |
312 | /* Get the current svr4 data. If none is found yet, add it now. This |
313 | function always returns a valid object. */ | |
34439770 | 314 | |
6c95b8df PA |
315 | static struct svr4_info * |
316 | get_svr4_info (void) | |
1a816a87 | 317 | { |
6c95b8df | 318 | struct svr4_info *info; |
1a816a87 | 319 | |
6c95b8df PA |
320 | info = program_space_data (current_program_space, solib_svr4_pspace_data); |
321 | if (info != NULL) | |
322 | return info; | |
34439770 | 323 | |
6c95b8df PA |
324 | info = XZALLOC (struct svr4_info); |
325 | set_program_space_data (current_program_space, solib_svr4_pspace_data, info); | |
326 | return info; | |
1a816a87 | 327 | } |
93a57060 | 328 | |
13437d4b KB |
329 | /* Local function prototypes */ |
330 | ||
331 | static int match_main (char *); | |
332 | ||
2bbe3cc1 | 333 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *); |
13437d4b KB |
334 | |
335 | /* | |
336 | ||
337 | LOCAL FUNCTION | |
338 | ||
339 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
340 | ||
341 | SYNOPSIS | |
342 | ||
2bbe3cc1 | 343 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) |
13437d4b KB |
344 | |
345 | DESCRIPTION | |
346 | ||
347 | An expensive way to lookup the value of a single symbol for | |
348 | bfd's that are only temporary anyway. This is used by the | |
349 | shared library support to find the address of the debugger | |
2bbe3cc1 | 350 | notification routine in the shared library. |
13437d4b | 351 | |
2bbe3cc1 DJ |
352 | The returned symbol may be in a code or data section; functions |
353 | will normally be in a code section, but may be in a data section | |
354 | if this architecture uses function descriptors. | |
87f84c9d | 355 | |
13437d4b KB |
356 | Note that 0 is specifically allowed as an error return (no |
357 | such symbol). | |
358 | */ | |
359 | ||
360 | static CORE_ADDR | |
2bbe3cc1 | 361 | bfd_lookup_symbol (bfd *abfd, char *symname) |
13437d4b | 362 | { |
435b259c | 363 | long storage_needed; |
13437d4b KB |
364 | asymbol *sym; |
365 | asymbol **symbol_table; | |
366 | unsigned int number_of_symbols; | |
367 | unsigned int i; | |
368 | struct cleanup *back_to; | |
369 | CORE_ADDR symaddr = 0; | |
370 | ||
371 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
372 | ||
373 | if (storage_needed > 0) | |
374 | { | |
375 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 376 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
377 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
378 | ||
379 | for (i = 0; i < number_of_symbols; i++) | |
380 | { | |
381 | sym = *symbol_table++; | |
6314a349 | 382 | if (strcmp (sym->name, symname) == 0 |
2bbe3cc1 | 383 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) |
13437d4b | 384 | { |
2bbe3cc1 | 385 | /* BFD symbols are section relative. */ |
13437d4b KB |
386 | symaddr = sym->value + sym->section->vma; |
387 | break; | |
388 | } | |
389 | } | |
390 | do_cleanups (back_to); | |
391 | } | |
392 | ||
393 | if (symaddr) | |
394 | return symaddr; | |
395 | ||
396 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll | |
397 | have to check the dynamic string table too. */ | |
398 | ||
399 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
400 | ||
401 | if (storage_needed > 0) | |
402 | { | |
403 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 404 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
405 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table); |
406 | ||
407 | for (i = 0; i < number_of_symbols; i++) | |
408 | { | |
409 | sym = *symbol_table++; | |
87f84c9d | 410 | |
6314a349 | 411 | if (strcmp (sym->name, symname) == 0 |
2bbe3cc1 | 412 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) |
13437d4b | 413 | { |
2bbe3cc1 | 414 | /* BFD symbols are section relative. */ |
13437d4b KB |
415 | symaddr = sym->value + sym->section->vma; |
416 | break; | |
417 | } | |
418 | } | |
419 | do_cleanups (back_to); | |
420 | } | |
421 | ||
422 | return symaddr; | |
423 | } | |
424 | ||
97ec2c2f UW |
425 | |
426 | /* Read program header TYPE from inferior memory. The header is found | |
427 | by scanning the OS auxillary vector. | |
428 | ||
429 | Return a pointer to allocated memory holding the program header contents, | |
430 | or NULL on failure. If sucessful, and unless P_SECT_SIZE is NULL, the | |
431 | size of those contents is returned to P_SECT_SIZE. Likewise, the target | |
432 | architecture size (32-bit or 64-bit) is returned to P_ARCH_SIZE. */ | |
433 | ||
434 | static gdb_byte * | |
435 | read_program_header (int type, int *p_sect_size, int *p_arch_size) | |
436 | { | |
e17a4113 | 437 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
97ec2c2f UW |
438 | CORE_ADDR at_phdr, at_phent, at_phnum; |
439 | int arch_size, sect_size; | |
440 | CORE_ADDR sect_addr; | |
441 | gdb_byte *buf; | |
442 | ||
443 | /* Get required auxv elements from target. */ | |
444 | if (target_auxv_search (¤t_target, AT_PHDR, &at_phdr) <= 0) | |
445 | return 0; | |
446 | if (target_auxv_search (¤t_target, AT_PHENT, &at_phent) <= 0) | |
447 | return 0; | |
448 | if (target_auxv_search (¤t_target, AT_PHNUM, &at_phnum) <= 0) | |
449 | return 0; | |
450 | if (!at_phdr || !at_phnum) | |
451 | return 0; | |
452 | ||
453 | /* Determine ELF architecture type. */ | |
454 | if (at_phent == sizeof (Elf32_External_Phdr)) | |
455 | arch_size = 32; | |
456 | else if (at_phent == sizeof (Elf64_External_Phdr)) | |
457 | arch_size = 64; | |
458 | else | |
459 | return 0; | |
460 | ||
461 | /* Find .dynamic section via the PT_DYNAMIC PHDR. */ | |
462 | if (arch_size == 32) | |
463 | { | |
464 | Elf32_External_Phdr phdr; | |
465 | int i; | |
466 | ||
467 | /* Search for requested PHDR. */ | |
468 | for (i = 0; i < at_phnum; i++) | |
469 | { | |
470 | if (target_read_memory (at_phdr + i * sizeof (phdr), | |
471 | (gdb_byte *)&phdr, sizeof (phdr))) | |
472 | return 0; | |
473 | ||
e17a4113 UW |
474 | if (extract_unsigned_integer ((gdb_byte *)phdr.p_type, |
475 | 4, byte_order) == type) | |
97ec2c2f UW |
476 | break; |
477 | } | |
478 | ||
479 | if (i == at_phnum) | |
480 | return 0; | |
481 | ||
482 | /* Retrieve address and size. */ | |
e17a4113 UW |
483 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
484 | 4, byte_order); | |
485 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
486 | 4, byte_order); | |
97ec2c2f UW |
487 | } |
488 | else | |
489 | { | |
490 | Elf64_External_Phdr phdr; | |
491 | int i; | |
492 | ||
493 | /* Search for requested PHDR. */ | |
494 | for (i = 0; i < at_phnum; i++) | |
495 | { | |
496 | if (target_read_memory (at_phdr + i * sizeof (phdr), | |
497 | (gdb_byte *)&phdr, sizeof (phdr))) | |
498 | return 0; | |
499 | ||
e17a4113 UW |
500 | if (extract_unsigned_integer ((gdb_byte *)phdr.p_type, |
501 | 4, byte_order) == type) | |
97ec2c2f UW |
502 | break; |
503 | } | |
504 | ||
505 | if (i == at_phnum) | |
506 | return 0; | |
507 | ||
508 | /* Retrieve address and size. */ | |
e17a4113 UW |
509 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
510 | 8, byte_order); | |
511 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
512 | 8, byte_order); | |
97ec2c2f UW |
513 | } |
514 | ||
515 | /* Read in requested program header. */ | |
516 | buf = xmalloc (sect_size); | |
517 | if (target_read_memory (sect_addr, buf, sect_size)) | |
518 | { | |
519 | xfree (buf); | |
520 | return NULL; | |
521 | } | |
522 | ||
523 | if (p_arch_size) | |
524 | *p_arch_size = arch_size; | |
525 | if (p_sect_size) | |
526 | *p_sect_size = sect_size; | |
527 | ||
528 | return buf; | |
529 | } | |
530 | ||
531 | ||
532 | /* Return program interpreter string. */ | |
533 | static gdb_byte * | |
534 | find_program_interpreter (void) | |
535 | { | |
536 | gdb_byte *buf = NULL; | |
537 | ||
538 | /* If we have an exec_bfd, use its section table. */ | |
539 | if (exec_bfd | |
540 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
541 | { | |
542 | struct bfd_section *interp_sect; | |
543 | ||
544 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
545 | if (interp_sect != NULL) | |
546 | { | |
547 | CORE_ADDR sect_addr = bfd_section_vma (exec_bfd, interp_sect); | |
548 | int sect_size = bfd_section_size (exec_bfd, interp_sect); | |
549 | ||
550 | buf = xmalloc (sect_size); | |
551 | bfd_get_section_contents (exec_bfd, interp_sect, buf, 0, sect_size); | |
552 | } | |
553 | } | |
554 | ||
555 | /* If we didn't find it, use the target auxillary vector. */ | |
556 | if (!buf) | |
557 | buf = read_program_header (PT_INTERP, NULL, NULL); | |
558 | ||
559 | return buf; | |
560 | } | |
561 | ||
562 | ||
3a40aaa0 UW |
563 | /* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is |
564 | returned and the corresponding PTR is set. */ | |
565 | ||
566 | static int | |
567 | scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr) | |
568 | { | |
569 | int arch_size, step, sect_size; | |
570 | long dyn_tag; | |
571 | CORE_ADDR dyn_ptr, dyn_addr; | |
65728c26 | 572 | gdb_byte *bufend, *bufstart, *buf; |
3a40aaa0 UW |
573 | Elf32_External_Dyn *x_dynp_32; |
574 | Elf64_External_Dyn *x_dynp_64; | |
575 | struct bfd_section *sect; | |
576 | ||
577 | if (abfd == NULL) | |
578 | return 0; | |
0763ab81 PA |
579 | |
580 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
581 | return 0; | |
582 | ||
3a40aaa0 UW |
583 | arch_size = bfd_get_arch_size (abfd); |
584 | if (arch_size == -1) | |
0763ab81 | 585 | return 0; |
3a40aaa0 UW |
586 | |
587 | /* Find the start address of the .dynamic section. */ | |
588 | sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
589 | if (sect == NULL) | |
590 | return 0; | |
591 | dyn_addr = bfd_section_vma (abfd, sect); | |
592 | ||
65728c26 DJ |
593 | /* Read in .dynamic from the BFD. We will get the actual value |
594 | from memory later. */ | |
3a40aaa0 | 595 | sect_size = bfd_section_size (abfd, sect); |
65728c26 DJ |
596 | buf = bufstart = alloca (sect_size); |
597 | if (!bfd_get_section_contents (abfd, sect, | |
598 | buf, 0, sect_size)) | |
599 | return 0; | |
3a40aaa0 UW |
600 | |
601 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
602 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
603 | : sizeof (Elf64_External_Dyn); | |
604 | for (bufend = buf + sect_size; | |
605 | buf < bufend; | |
606 | buf += step) | |
607 | { | |
608 | if (arch_size == 32) | |
609 | { | |
610 | x_dynp_32 = (Elf32_External_Dyn *) buf; | |
611 | dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag); | |
612 | dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr); | |
613 | } | |
65728c26 | 614 | else |
3a40aaa0 UW |
615 | { |
616 | x_dynp_64 = (Elf64_External_Dyn *) buf; | |
617 | dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag); | |
618 | dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr); | |
619 | } | |
620 | if (dyn_tag == DT_NULL) | |
621 | return 0; | |
622 | if (dyn_tag == dyntag) | |
623 | { | |
65728c26 DJ |
624 | /* If requested, try to read the runtime value of this .dynamic |
625 | entry. */ | |
3a40aaa0 | 626 | if (ptr) |
65728c26 | 627 | { |
b6da22b0 | 628 | struct type *ptr_type; |
65728c26 DJ |
629 | gdb_byte ptr_buf[8]; |
630 | CORE_ADDR ptr_addr; | |
631 | ||
b6da22b0 | 632 | ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
65728c26 DJ |
633 | ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8; |
634 | if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0) | |
b6da22b0 | 635 | dyn_ptr = extract_typed_address (ptr_buf, ptr_type); |
65728c26 DJ |
636 | *ptr = dyn_ptr; |
637 | } | |
638 | return 1; | |
3a40aaa0 UW |
639 | } |
640 | } | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
97ec2c2f UW |
645 | /* Scan for DYNTAG in .dynamic section of the target's main executable, |
646 | found by consulting the OS auxillary vector. If DYNTAG is found 1 is | |
647 | returned and the corresponding PTR is set. */ | |
648 | ||
649 | static int | |
650 | scan_dyntag_auxv (int dyntag, CORE_ADDR *ptr) | |
651 | { | |
e17a4113 | 652 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
97ec2c2f UW |
653 | int sect_size, arch_size, step; |
654 | long dyn_tag; | |
655 | CORE_ADDR dyn_ptr; | |
656 | gdb_byte *bufend, *bufstart, *buf; | |
657 | ||
658 | /* Read in .dynamic section. */ | |
659 | buf = bufstart = read_program_header (PT_DYNAMIC, §_size, &arch_size); | |
660 | if (!buf) | |
661 | return 0; | |
662 | ||
663 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
664 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
665 | : sizeof (Elf64_External_Dyn); | |
666 | for (bufend = buf + sect_size; | |
667 | buf < bufend; | |
668 | buf += step) | |
669 | { | |
670 | if (arch_size == 32) | |
671 | { | |
672 | Elf32_External_Dyn *dynp = (Elf32_External_Dyn *) buf; | |
e17a4113 UW |
673 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
674 | 4, byte_order); | |
675 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
676 | 4, byte_order); | |
97ec2c2f UW |
677 | } |
678 | else | |
679 | { | |
680 | Elf64_External_Dyn *dynp = (Elf64_External_Dyn *) buf; | |
e17a4113 UW |
681 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
682 | 8, byte_order); | |
683 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
684 | 8, byte_order); | |
97ec2c2f UW |
685 | } |
686 | if (dyn_tag == DT_NULL) | |
687 | break; | |
688 | ||
689 | if (dyn_tag == dyntag) | |
690 | { | |
691 | if (ptr) | |
692 | *ptr = dyn_ptr; | |
693 | ||
694 | xfree (bufstart); | |
695 | return 1; | |
696 | } | |
697 | } | |
698 | ||
699 | xfree (bufstart); | |
700 | return 0; | |
701 | } | |
702 | ||
3a40aaa0 | 703 | |
13437d4b KB |
704 | /* |
705 | ||
706 | LOCAL FUNCTION | |
707 | ||
708 | elf_locate_base -- locate the base address of dynamic linker structs | |
709 | for SVR4 elf targets. | |
710 | ||
711 | SYNOPSIS | |
712 | ||
713 | CORE_ADDR elf_locate_base (void) | |
714 | ||
715 | DESCRIPTION | |
716 | ||
717 | For SVR4 elf targets the address of the dynamic linker's runtime | |
718 | structure is contained within the dynamic info section in the | |
719 | executable file. The dynamic section is also mapped into the | |
720 | inferior address space. Because the runtime loader fills in the | |
721 | real address before starting the inferior, we have to read in the | |
722 | dynamic info section from the inferior address space. | |
723 | If there are any errors while trying to find the address, we | |
724 | silently return 0, otherwise the found address is returned. | |
725 | ||
726 | */ | |
727 | ||
728 | static CORE_ADDR | |
729 | elf_locate_base (void) | |
730 | { | |
3a40aaa0 UW |
731 | struct minimal_symbol *msymbol; |
732 | CORE_ADDR dyn_ptr; | |
13437d4b | 733 | |
65728c26 DJ |
734 | /* Look for DT_MIPS_RLD_MAP first. MIPS executables use this |
735 | instead of DT_DEBUG, although they sometimes contain an unused | |
736 | DT_DEBUG. */ | |
97ec2c2f UW |
737 | if (scan_dyntag (DT_MIPS_RLD_MAP, exec_bfd, &dyn_ptr) |
738 | || scan_dyntag_auxv (DT_MIPS_RLD_MAP, &dyn_ptr)) | |
3a40aaa0 | 739 | { |
b6da22b0 | 740 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
3a40aaa0 | 741 | gdb_byte *pbuf; |
b6da22b0 | 742 | int pbuf_size = TYPE_LENGTH (ptr_type); |
3a40aaa0 UW |
743 | pbuf = alloca (pbuf_size); |
744 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
745 | of the dynamic link structure. */ | |
746 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) | |
e499d0f1 | 747 | return 0; |
b6da22b0 | 748 | return extract_typed_address (pbuf, ptr_type); |
e499d0f1 DJ |
749 | } |
750 | ||
65728c26 | 751 | /* Find DT_DEBUG. */ |
97ec2c2f UW |
752 | if (scan_dyntag (DT_DEBUG, exec_bfd, &dyn_ptr) |
753 | || scan_dyntag_auxv (DT_DEBUG, &dyn_ptr)) | |
65728c26 DJ |
754 | return dyn_ptr; |
755 | ||
3a40aaa0 UW |
756 | /* This may be a static executable. Look for the symbol |
757 | conventionally named _r_debug, as a last resort. */ | |
758 | msymbol = lookup_minimal_symbol ("_r_debug", NULL, symfile_objfile); | |
759 | if (msymbol != NULL) | |
760 | return SYMBOL_VALUE_ADDRESS (msymbol); | |
13437d4b KB |
761 | |
762 | /* DT_DEBUG entry not found. */ | |
763 | return 0; | |
764 | } | |
765 | ||
13437d4b KB |
766 | /* |
767 | ||
768 | LOCAL FUNCTION | |
769 | ||
770 | locate_base -- locate the base address of dynamic linker structs | |
771 | ||
772 | SYNOPSIS | |
773 | ||
1a816a87 | 774 | CORE_ADDR locate_base (struct svr4_info *) |
13437d4b KB |
775 | |
776 | DESCRIPTION | |
777 | ||
778 | For both the SunOS and SVR4 shared library implementations, if the | |
779 | inferior executable has been linked dynamically, there is a single | |
780 | address somewhere in the inferior's data space which is the key to | |
781 | locating all of the dynamic linker's runtime structures. This | |
782 | address is the value of the debug base symbol. The job of this | |
783 | function is to find and return that address, or to return 0 if there | |
784 | is no such address (the executable is statically linked for example). | |
785 | ||
786 | For SunOS, the job is almost trivial, since the dynamic linker and | |
787 | all of it's structures are statically linked to the executable at | |
788 | link time. Thus the symbol for the address we are looking for has | |
789 | already been added to the minimal symbol table for the executable's | |
790 | objfile at the time the symbol file's symbols were read, and all we | |
791 | have to do is look it up there. Note that we explicitly do NOT want | |
792 | to find the copies in the shared library. | |
793 | ||
794 | The SVR4 version is a bit more complicated because the address | |
795 | is contained somewhere in the dynamic info section. We have to go | |
796 | to a lot more work to discover the address of the debug base symbol. | |
797 | Because of this complexity, we cache the value we find and return that | |
798 | value on subsequent invocations. Note there is no copy in the | |
799 | executable symbol tables. | |
800 | ||
801 | */ | |
802 | ||
803 | static CORE_ADDR | |
1a816a87 | 804 | locate_base (struct svr4_info *info) |
13437d4b | 805 | { |
13437d4b KB |
806 | /* Check to see if we have a currently valid address, and if so, avoid |
807 | doing all this work again and just return the cached address. If | |
808 | we have no cached address, try to locate it in the dynamic info | |
d5a921c9 KB |
809 | section for ELF executables. There's no point in doing any of this |
810 | though if we don't have some link map offsets to work with. */ | |
13437d4b | 811 | |
1a816a87 | 812 | if (info->debug_base == 0 && svr4_have_link_map_offsets ()) |
0763ab81 | 813 | info->debug_base = elf_locate_base (); |
1a816a87 | 814 | return info->debug_base; |
13437d4b KB |
815 | } |
816 | ||
e4cd0d6a MK |
817 | /* Find the first element in the inferior's dynamic link map, and |
818 | return its address in the inferior. | |
13437d4b | 819 | |
e4cd0d6a MK |
820 | FIXME: Perhaps we should validate the info somehow, perhaps by |
821 | checking r_version for a known version number, or r_state for | |
822 | RT_CONSISTENT. */ | |
13437d4b KB |
823 | |
824 | static CORE_ADDR | |
1a816a87 | 825 | solib_svr4_r_map (struct svr4_info *info) |
13437d4b | 826 | { |
4b188b9f | 827 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 828 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 829 | |
1a816a87 PA |
830 | return read_memory_typed_address (info->debug_base + lmo->r_map_offset, |
831 | ptr_type); | |
e4cd0d6a | 832 | } |
13437d4b | 833 | |
7cd25cfc DJ |
834 | /* Find r_brk from the inferior's debug base. */ |
835 | ||
836 | static CORE_ADDR | |
1a816a87 | 837 | solib_svr4_r_brk (struct svr4_info *info) |
7cd25cfc DJ |
838 | { |
839 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 840 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
7cd25cfc | 841 | |
1a816a87 PA |
842 | return read_memory_typed_address (info->debug_base + lmo->r_brk_offset, |
843 | ptr_type); | |
7cd25cfc DJ |
844 | } |
845 | ||
e4cd0d6a MK |
846 | /* Find the link map for the dynamic linker (if it is not in the |
847 | normal list of loaded shared objects). */ | |
13437d4b | 848 | |
e4cd0d6a | 849 | static CORE_ADDR |
1a816a87 | 850 | solib_svr4_r_ldsomap (struct svr4_info *info) |
e4cd0d6a MK |
851 | { |
852 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 853 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
e17a4113 | 854 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
e4cd0d6a | 855 | ULONGEST version; |
13437d4b | 856 | |
e4cd0d6a MK |
857 | /* Check version, and return zero if `struct r_debug' doesn't have |
858 | the r_ldsomap member. */ | |
1a816a87 PA |
859 | version |
860 | = read_memory_unsigned_integer (info->debug_base + lmo->r_version_offset, | |
e17a4113 | 861 | lmo->r_version_size, byte_order); |
e4cd0d6a MK |
862 | if (version < 2 || lmo->r_ldsomap_offset == -1) |
863 | return 0; | |
13437d4b | 864 | |
1a816a87 | 865 | return read_memory_typed_address (info->debug_base + lmo->r_ldsomap_offset, |
b6da22b0 | 866 | ptr_type); |
13437d4b KB |
867 | } |
868 | ||
de18c1d8 JM |
869 | /* On Solaris systems with some versions of the dynamic linker, |
870 | ld.so's l_name pointer points to the SONAME in the string table | |
871 | rather than into writable memory. So that GDB can find shared | |
872 | libraries when loading a core file generated by gcore, ensure that | |
873 | memory areas containing the l_name string are saved in the core | |
874 | file. */ | |
875 | ||
876 | static int | |
877 | svr4_keep_data_in_core (CORE_ADDR vaddr, unsigned long size) | |
878 | { | |
879 | struct svr4_info *info; | |
880 | CORE_ADDR ldsomap; | |
881 | struct so_list *new; | |
882 | struct cleanup *old_chain; | |
883 | struct link_map_offsets *lmo; | |
884 | CORE_ADDR lm_name; | |
885 | ||
886 | info = get_svr4_info (); | |
887 | ||
888 | info->debug_base = 0; | |
889 | locate_base (info); | |
890 | if (!info->debug_base) | |
891 | return 0; | |
892 | ||
893 | ldsomap = solib_svr4_r_ldsomap (info); | |
894 | if (!ldsomap) | |
895 | return 0; | |
896 | ||
897 | lmo = svr4_fetch_link_map_offsets (); | |
898 | new = XZALLOC (struct so_list); | |
899 | old_chain = make_cleanup (xfree, new); | |
900 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
901 | make_cleanup (xfree, new->lm_info); | |
902 | new->lm_info->l_addr = (CORE_ADDR)-1; | |
903 | new->lm_info->lm_addr = ldsomap; | |
904 | new->lm_info->lm = xzalloc (lmo->link_map_size); | |
905 | make_cleanup (xfree, new->lm_info->lm); | |
906 | read_memory (ldsomap, new->lm_info->lm, lmo->link_map_size); | |
907 | lm_name = LM_NAME (new); | |
908 | do_cleanups (old_chain); | |
909 | ||
910 | return (lm_name >= vaddr && lm_name < vaddr + size); | |
911 | } | |
912 | ||
13437d4b KB |
913 | /* |
914 | ||
915 | LOCAL FUNCTION | |
916 | ||
917 | open_symbol_file_object | |
918 | ||
919 | SYNOPSIS | |
920 | ||
921 | void open_symbol_file_object (void *from_tty) | |
922 | ||
923 | DESCRIPTION | |
924 | ||
925 | If no open symbol file, attempt to locate and open the main symbol | |
926 | file. On SVR4 systems, this is the first link map entry. If its | |
927 | name is here, we can open it. Useful when attaching to a process | |
928 | without first loading its symbol file. | |
929 | ||
930 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |
931 | be printed. This parameter is a pointer rather than an int because | |
932 | open_symbol_file_object() is called via catch_errors() and | |
933 | catch_errors() requires a pointer argument. */ | |
934 | ||
935 | static int | |
936 | open_symbol_file_object (void *from_ttyp) | |
937 | { | |
938 | CORE_ADDR lm, l_name; | |
939 | char *filename; | |
940 | int errcode; | |
941 | int from_tty = *(int *)from_ttyp; | |
4b188b9f | 942 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 UW |
943 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
944 | int l_name_size = TYPE_LENGTH (ptr_type); | |
cfaefc65 | 945 | gdb_byte *l_name_buf = xmalloc (l_name_size); |
b8c9b27d | 946 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); |
6c95b8df | 947 | struct svr4_info *info = get_svr4_info (); |
13437d4b KB |
948 | |
949 | if (symfile_objfile) | |
9e2f0ad4 | 950 | if (!query (_("Attempt to reload symbols from process? "))) |
13437d4b KB |
951 | return 0; |
952 | ||
7cd25cfc | 953 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
954 | info->debug_base = 0; |
955 | if (locate_base (info) == 0) | |
13437d4b KB |
956 | return 0; /* failed somehow... */ |
957 | ||
958 | /* First link map member should be the executable. */ | |
1a816a87 | 959 | lm = solib_svr4_r_map (info); |
e4cd0d6a | 960 | if (lm == 0) |
13437d4b KB |
961 | return 0; /* failed somehow... */ |
962 | ||
963 | /* Read address of name from target memory to GDB. */ | |
cfaefc65 | 964 | read_memory (lm + lmo->l_name_offset, l_name_buf, l_name_size); |
13437d4b | 965 | |
cfaefc65 | 966 | /* Convert the address to host format. */ |
b6da22b0 | 967 | l_name = extract_typed_address (l_name_buf, ptr_type); |
13437d4b KB |
968 | |
969 | /* Free l_name_buf. */ | |
970 | do_cleanups (cleanups); | |
971 | ||
972 | if (l_name == 0) | |
973 | return 0; /* No filename. */ | |
974 | ||
975 | /* Now fetch the filename from target memory. */ | |
976 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
ea5bf0a1 | 977 | make_cleanup (xfree, filename); |
13437d4b KB |
978 | |
979 | if (errcode) | |
980 | { | |
8a3fe4f8 | 981 | warning (_("failed to read exec filename from attached file: %s"), |
13437d4b KB |
982 | safe_strerror (errcode)); |
983 | return 0; | |
984 | } | |
985 | ||
13437d4b | 986 | /* Have a pathname: read the symbol file. */ |
1adeb98a | 987 | symbol_file_add_main (filename, from_tty); |
13437d4b KB |
988 | |
989 | return 1; | |
990 | } | |
13437d4b | 991 | |
34439770 DJ |
992 | /* If no shared library information is available from the dynamic |
993 | linker, build a fallback list from other sources. */ | |
994 | ||
995 | static struct so_list * | |
996 | svr4_default_sos (void) | |
997 | { | |
6c95b8df | 998 | struct svr4_info *info = get_svr4_info (); |
1a816a87 | 999 | |
34439770 DJ |
1000 | struct so_list *head = NULL; |
1001 | struct so_list **link_ptr = &head; | |
1002 | ||
1a816a87 | 1003 | if (info->debug_loader_offset_p) |
34439770 DJ |
1004 | { |
1005 | struct so_list *new = XZALLOC (struct so_list); | |
1006 | ||
1007 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
1008 | ||
1009 | /* Nothing will ever check the cached copy of the link | |
1010 | map if we set l_addr. */ | |
1a816a87 | 1011 | new->lm_info->l_addr = info->debug_loader_offset; |
93a57060 | 1012 | new->lm_info->lm_addr = 0; |
34439770 DJ |
1013 | new->lm_info->lm = NULL; |
1014 | ||
1a816a87 PA |
1015 | strncpy (new->so_name, info->debug_loader_name, |
1016 | SO_NAME_MAX_PATH_SIZE - 1); | |
34439770 DJ |
1017 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
1018 | strcpy (new->so_original_name, new->so_name); | |
1019 | ||
1020 | *link_ptr = new; | |
1021 | link_ptr = &new->next; | |
1022 | } | |
1023 | ||
1024 | return head; | |
1025 | } | |
1026 | ||
13437d4b KB |
1027 | /* LOCAL FUNCTION |
1028 | ||
1029 | current_sos -- build a list of currently loaded shared objects | |
1030 | ||
1031 | SYNOPSIS | |
1032 | ||
1033 | struct so_list *current_sos () | |
1034 | ||
1035 | DESCRIPTION | |
1036 | ||
1037 | Build a list of `struct so_list' objects describing the shared | |
1038 | objects currently loaded in the inferior. This list does not | |
1039 | include an entry for the main executable file. | |
1040 | ||
1041 | Note that we only gather information directly available from the | |
1042 | inferior --- we don't examine any of the shared library files | |
1043 | themselves. The declaration of `struct so_list' says which fields | |
1044 | we provide values for. */ | |
1045 | ||
1046 | static struct so_list * | |
1047 | svr4_current_sos (void) | |
1048 | { | |
1049 | CORE_ADDR lm; | |
1050 | struct so_list *head = 0; | |
1051 | struct so_list **link_ptr = &head; | |
e4cd0d6a | 1052 | CORE_ADDR ldsomap = 0; |
1a816a87 PA |
1053 | struct svr4_info *info; |
1054 | ||
6c95b8df | 1055 | info = get_svr4_info (); |
13437d4b | 1056 | |
7cd25cfc | 1057 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
1058 | info->debug_base = 0; |
1059 | locate_base (info); | |
13437d4b | 1060 | |
7cd25cfc DJ |
1061 | /* If we can't find the dynamic linker's base structure, this |
1062 | must not be a dynamically linked executable. Hmm. */ | |
1a816a87 | 1063 | if (! info->debug_base) |
7cd25cfc | 1064 | return svr4_default_sos (); |
13437d4b KB |
1065 | |
1066 | /* Walk the inferior's link map list, and build our list of | |
1067 | `struct so_list' nodes. */ | |
1a816a87 | 1068 | lm = solib_svr4_r_map (info); |
34439770 | 1069 | |
13437d4b KB |
1070 | while (lm) |
1071 | { | |
4b188b9f | 1072 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f4456994 | 1073 | struct so_list *new = XZALLOC (struct so_list); |
b8c9b27d | 1074 | struct cleanup *old_chain = make_cleanup (xfree, new); |
13437d4b | 1075 | |
13437d4b | 1076 | new->lm_info = xmalloc (sizeof (struct lm_info)); |
b8c9b27d | 1077 | make_cleanup (xfree, new->lm_info); |
13437d4b | 1078 | |
831004b7 | 1079 | new->lm_info->l_addr = (CORE_ADDR)-1; |
93a57060 | 1080 | new->lm_info->lm_addr = lm; |
f4456994 | 1081 | new->lm_info->lm = xzalloc (lmo->link_map_size); |
b8c9b27d | 1082 | make_cleanup (xfree, new->lm_info->lm); |
13437d4b KB |
1083 | |
1084 | read_memory (lm, new->lm_info->lm, lmo->link_map_size); | |
1085 | ||
1086 | lm = LM_NEXT (new); | |
1087 | ||
1088 | /* For SVR4 versions, the first entry in the link map is for the | |
1089 | inferior executable, so we must ignore it. For some versions of | |
1090 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1091 | does have a name, so we can no longer use a missing name to | |
1092 | decide when to ignore it. */ | |
e4cd0d6a | 1093 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new) && ldsomap == 0) |
93a57060 | 1094 | { |
1a816a87 | 1095 | info->main_lm_addr = new->lm_info->lm_addr; |
93a57060 DJ |
1096 | free_so (new); |
1097 | } | |
13437d4b KB |
1098 | else |
1099 | { | |
1100 | int errcode; | |
1101 | char *buffer; | |
1102 | ||
1103 | /* Extract this shared object's name. */ | |
1104 | target_read_string (LM_NAME (new), &buffer, | |
1105 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
1106 | if (errcode != 0) | |
8a3fe4f8 AC |
1107 | warning (_("Can't read pathname for load map: %s."), |
1108 | safe_strerror (errcode)); | |
13437d4b KB |
1109 | else |
1110 | { | |
1111 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); | |
1112 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
13437d4b KB |
1113 | strcpy (new->so_original_name, new->so_name); |
1114 | } | |
ea5bf0a1 | 1115 | xfree (buffer); |
13437d4b KB |
1116 | |
1117 | /* If this entry has no name, or its name matches the name | |
1118 | for the main executable, don't include it in the list. */ | |
1119 | if (! new->so_name[0] | |
1120 | || match_main (new->so_name)) | |
1121 | free_so (new); | |
1122 | else | |
1123 | { | |
1124 | new->next = 0; | |
1125 | *link_ptr = new; | |
1126 | link_ptr = &new->next; | |
1127 | } | |
1128 | } | |
1129 | ||
e4cd0d6a MK |
1130 | /* On Solaris, the dynamic linker is not in the normal list of |
1131 | shared objects, so make sure we pick it up too. Having | |
1132 | symbol information for the dynamic linker is quite crucial | |
1133 | for skipping dynamic linker resolver code. */ | |
1134 | if (lm == 0 && ldsomap == 0) | |
1a816a87 | 1135 | lm = ldsomap = solib_svr4_r_ldsomap (info); |
e4cd0d6a | 1136 | |
13437d4b KB |
1137 | discard_cleanups (old_chain); |
1138 | } | |
1139 | ||
34439770 DJ |
1140 | if (head == NULL) |
1141 | return svr4_default_sos (); | |
1142 | ||
13437d4b KB |
1143 | return head; |
1144 | } | |
1145 | ||
93a57060 | 1146 | /* Get the address of the link_map for a given OBJFILE. */ |
bc4a16ae EZ |
1147 | |
1148 | CORE_ADDR | |
1149 | svr4_fetch_objfile_link_map (struct objfile *objfile) | |
1150 | { | |
93a57060 | 1151 | struct so_list *so; |
6c95b8df | 1152 | struct svr4_info *info = get_svr4_info (); |
bc4a16ae | 1153 | |
93a57060 | 1154 | /* Cause svr4_current_sos() to be run if it hasn't been already. */ |
1a816a87 | 1155 | if (info->main_lm_addr == 0) |
93a57060 | 1156 | solib_add (NULL, 0, ¤t_target, auto_solib_add); |
bc4a16ae | 1157 | |
93a57060 DJ |
1158 | /* svr4_current_sos() will set main_lm_addr for the main executable. */ |
1159 | if (objfile == symfile_objfile) | |
1a816a87 | 1160 | return info->main_lm_addr; |
93a57060 DJ |
1161 | |
1162 | /* The other link map addresses may be found by examining the list | |
1163 | of shared libraries. */ | |
1164 | for (so = master_so_list (); so; so = so->next) | |
1165 | if (so->objfile == objfile) | |
1166 | return so->lm_info->lm_addr; | |
1167 | ||
1168 | /* Not found! */ | |
bc4a16ae EZ |
1169 | return 0; |
1170 | } | |
13437d4b KB |
1171 | |
1172 | /* On some systems, the only way to recognize the link map entry for | |
1173 | the main executable file is by looking at its name. Return | |
1174 | non-zero iff SONAME matches one of the known main executable names. */ | |
1175 | ||
1176 | static int | |
1177 | match_main (char *soname) | |
1178 | { | |
1179 | char **mainp; | |
1180 | ||
1181 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
1182 | { | |
1183 | if (strcmp (soname, *mainp) == 0) | |
1184 | return (1); | |
1185 | } | |
1186 | ||
1187 | return (0); | |
1188 | } | |
1189 | ||
13437d4b KB |
1190 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
1191 | SVR4 run time loader. */ | |
13437d4b | 1192 | |
7d522c90 | 1193 | int |
d7fa2ae2 | 1194 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) |
13437d4b | 1195 | { |
6c95b8df PA |
1196 | struct svr4_info *info = get_svr4_info (); |
1197 | ||
1198 | return ((pc >= info->interp_text_sect_low | |
1199 | && pc < info->interp_text_sect_high) | |
1200 | || (pc >= info->interp_plt_sect_low | |
1201 | && pc < info->interp_plt_sect_high) | |
13437d4b KB |
1202 | || in_plt_section (pc, NULL)); |
1203 | } | |
13437d4b | 1204 | |
2f4950cd AC |
1205 | /* Given an executable's ABFD and target, compute the entry-point |
1206 | address. */ | |
1207 | ||
1208 | static CORE_ADDR | |
1209 | exec_entry_point (struct bfd *abfd, struct target_ops *targ) | |
1210 | { | |
1211 | /* KevinB wrote ... for most targets, the address returned by | |
1212 | bfd_get_start_address() is the entry point for the start | |
1213 | function. But, for some targets, bfd_get_start_address() returns | |
1214 | the address of a function descriptor from which the entry point | |
1215 | address may be extracted. This address is extracted by | |
1216 | gdbarch_convert_from_func_ptr_addr(). The method | |
1217 | gdbarch_convert_from_func_ptr_addr() is the merely the identify | |
1218 | function for targets which don't use function descriptors. */ | |
1cf3db46 | 1219 | return gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
2f4950cd AC |
1220 | bfd_get_start_address (abfd), |
1221 | targ); | |
1222 | } | |
13437d4b KB |
1223 | |
1224 | /* | |
1225 | ||
1226 | LOCAL FUNCTION | |
1227 | ||
1228 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1229 | ||
1230 | SYNOPSIS | |
1231 | ||
1232 | int enable_break (void) | |
1233 | ||
1234 | DESCRIPTION | |
1235 | ||
1236 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1237 | debugger interface, support for arranging for the inferior to hit | |
1238 | a breakpoint after mapping in the shared libraries. This function | |
1239 | enables that breakpoint. | |
1240 | ||
1241 | For SunOS, there is a special flag location (in_debugger) which we | |
1242 | set to 1. When the dynamic linker sees this flag set, it will set | |
1243 | a breakpoint at a location known only to itself, after saving the | |
1244 | original contents of that place and the breakpoint address itself, | |
1245 | in it's own internal structures. When we resume the inferior, it | |
1246 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1247 | We handle this (in a different place) by restoring the contents of | |
1248 | the breakpointed location (which is only known after it stops), | |
1249 | chasing around to locate the shared libraries that have been | |
1250 | loaded, then resuming. | |
1251 | ||
1252 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1253 | which is statically initialized at the time the shared library is | |
1254 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1255 | teed to be called once before mapping in a library, and again when | |
1256 | the mapping is complete. At the time we are examining this member, | |
1257 | it contains only the unrelocated offset of the function, so we have | |
1258 | to do our own relocation. Later, when the dynamic linker actually | |
1259 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1260 | ||
1261 | The debugger interface structure also contains an enumeration which | |
1262 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1263 | depending upon whether or not the library is being mapped or unmapped, | |
1264 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1265 | */ | |
1266 | ||
1267 | static int | |
1a816a87 | 1268 | enable_break (struct svr4_info *info) |
13437d4b | 1269 | { |
13437d4b KB |
1270 | struct minimal_symbol *msymbol; |
1271 | char **bkpt_namep; | |
1272 | asection *interp_sect; | |
97ec2c2f | 1273 | gdb_byte *interp_name; |
7cd25cfc | 1274 | CORE_ADDR sym_addr; |
13437d4b KB |
1275 | |
1276 | /* First, remove all the solib event breakpoints. Their addresses | |
1277 | may have changed since the last time we ran the program. */ | |
1278 | remove_solib_event_breakpoints (); | |
1279 | ||
6c95b8df PA |
1280 | info->interp_text_sect_low = info->interp_text_sect_high = 0; |
1281 | info->interp_plt_sect_low = info->interp_plt_sect_high = 0; | |
13437d4b | 1282 | |
7cd25cfc DJ |
1283 | /* If we already have a shared library list in the target, and |
1284 | r_debug contains r_brk, set the breakpoint there - this should | |
1285 | mean r_brk has already been relocated. Assume the dynamic linker | |
1286 | is the object containing r_brk. */ | |
1287 | ||
1288 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
1289 | sym_addr = 0; | |
1a816a87 PA |
1290 | if (info->debug_base && solib_svr4_r_map (info) != 0) |
1291 | sym_addr = solib_svr4_r_brk (info); | |
7cd25cfc DJ |
1292 | |
1293 | if (sym_addr != 0) | |
1294 | { | |
1295 | struct obj_section *os; | |
1296 | ||
b36ec657 | 1297 | sym_addr = gdbarch_addr_bits_remove |
1cf3db46 | 1298 | (target_gdbarch, gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
b36ec657 DJ |
1299 | sym_addr, |
1300 | ¤t_target)); | |
1301 | ||
7cd25cfc DJ |
1302 | os = find_pc_section (sym_addr); |
1303 | if (os != NULL) | |
1304 | { | |
1305 | /* Record the relocated start and end address of the dynamic linker | |
1306 | text and plt section for svr4_in_dynsym_resolve_code. */ | |
1307 | bfd *tmp_bfd; | |
1308 | CORE_ADDR load_addr; | |
1309 | ||
1310 | tmp_bfd = os->objfile->obfd; | |
1311 | load_addr = ANOFFSET (os->objfile->section_offsets, | |
1312 | os->objfile->sect_index_text); | |
1313 | ||
1314 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
1315 | if (interp_sect) | |
1316 | { | |
6c95b8df | 1317 | info->interp_text_sect_low = |
7cd25cfc | 1318 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1319 | info->interp_text_sect_high = |
1320 | info->interp_text_sect_low | |
1321 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1322 | } |
1323 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1324 | if (interp_sect) | |
1325 | { | |
6c95b8df | 1326 | info->interp_plt_sect_low = |
7cd25cfc | 1327 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1328 | info->interp_plt_sect_high = |
1329 | info->interp_plt_sect_low | |
1330 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1331 | } |
1332 | ||
a6d9a66e | 1333 | create_solib_event_breakpoint (target_gdbarch, sym_addr); |
7cd25cfc DJ |
1334 | return 1; |
1335 | } | |
1336 | } | |
1337 | ||
97ec2c2f | 1338 | /* Find the program interpreter; if not found, warn the user and drop |
13437d4b | 1339 | into the old breakpoint at symbol code. */ |
97ec2c2f UW |
1340 | interp_name = find_program_interpreter (); |
1341 | if (interp_name) | |
13437d4b | 1342 | { |
8ad2fcde KB |
1343 | CORE_ADDR load_addr = 0; |
1344 | int load_addr_found = 0; | |
2ec9a4f8 | 1345 | int loader_found_in_list = 0; |
f8766ec1 | 1346 | struct so_list *so; |
e4f7b8c8 | 1347 | bfd *tmp_bfd = NULL; |
2f4950cd | 1348 | struct target_ops *tmp_bfd_target; |
f1838a98 | 1349 | volatile struct gdb_exception ex; |
13437d4b | 1350 | |
7cd25cfc | 1351 | sym_addr = 0; |
13437d4b KB |
1352 | |
1353 | /* Now we need to figure out where the dynamic linker was | |
1354 | loaded so that we can load its symbols and place a breakpoint | |
1355 | in the dynamic linker itself. | |
1356 | ||
1357 | This address is stored on the stack. However, I've been unable | |
1358 | to find any magic formula to find it for Solaris (appears to | |
1359 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1360 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 | 1361 | |
f1838a98 UW |
1362 | TRY_CATCH (ex, RETURN_MASK_ALL) |
1363 | { | |
97ec2c2f | 1364 | tmp_bfd = solib_bfd_open (interp_name); |
f1838a98 | 1365 | } |
13437d4b KB |
1366 | if (tmp_bfd == NULL) |
1367 | goto bkpt_at_symbol; | |
1368 | ||
2f4950cd AC |
1369 | /* Now convert the TMP_BFD into a target. That way target, as |
1370 | well as BFD operations can be used. Note that closing the | |
1371 | target will also close the underlying bfd. */ | |
1372 | tmp_bfd_target = target_bfd_reopen (tmp_bfd); | |
1373 | ||
f8766ec1 KB |
1374 | /* On a running target, we can get the dynamic linker's base |
1375 | address from the shared library table. */ | |
f8766ec1 KB |
1376 | so = master_so_list (); |
1377 | while (so) | |
8ad2fcde | 1378 | { |
97ec2c2f | 1379 | if (svr4_same_1 (interp_name, so->so_original_name)) |
8ad2fcde KB |
1380 | { |
1381 | load_addr_found = 1; | |
2ec9a4f8 | 1382 | loader_found_in_list = 1; |
cc10cae3 | 1383 | load_addr = LM_ADDR_CHECK (so, tmp_bfd); |
8ad2fcde KB |
1384 | break; |
1385 | } | |
f8766ec1 | 1386 | so = so->next; |
8ad2fcde KB |
1387 | } |
1388 | ||
8d4e36ba JB |
1389 | /* If we were not able to find the base address of the loader |
1390 | from our so_list, then try using the AT_BASE auxilliary entry. */ | |
1391 | if (!load_addr_found) | |
1392 | if (target_auxv_search (¤t_target, AT_BASE, &load_addr) > 0) | |
1393 | load_addr_found = 1; | |
1394 | ||
8ad2fcde KB |
1395 | /* Otherwise we find the dynamic linker's base address by examining |
1396 | the current pc (which should point at the entry point for the | |
8d4e36ba JB |
1397 | dynamic linker) and subtracting the offset of the entry point. |
1398 | ||
1399 | This is more fragile than the previous approaches, but is a good | |
1400 | fallback method because it has actually been working well in | |
1401 | most cases. */ | |
8ad2fcde | 1402 | if (!load_addr_found) |
fb14de7b | 1403 | { |
c2250ad1 UW |
1404 | struct regcache *regcache |
1405 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch); | |
fb14de7b UW |
1406 | load_addr = (regcache_read_pc (regcache) |
1407 | - exec_entry_point (tmp_bfd, tmp_bfd_target)); | |
1408 | } | |
2ec9a4f8 DJ |
1409 | |
1410 | if (!loader_found_in_list) | |
34439770 | 1411 | { |
1a816a87 PA |
1412 | info->debug_loader_name = xstrdup (interp_name); |
1413 | info->debug_loader_offset_p = 1; | |
1414 | info->debug_loader_offset = load_addr; | |
2bbe3cc1 | 1415 | solib_add (NULL, 0, ¤t_target, auto_solib_add); |
34439770 | 1416 | } |
13437d4b KB |
1417 | |
1418 | /* Record the relocated start and end address of the dynamic linker | |
d7fa2ae2 | 1419 | text and plt section for svr4_in_dynsym_resolve_code. */ |
13437d4b KB |
1420 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1421 | if (interp_sect) | |
1422 | { | |
6c95b8df | 1423 | info->interp_text_sect_low = |
13437d4b | 1424 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1425 | info->interp_text_sect_high = |
1426 | info->interp_text_sect_low | |
1427 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1428 | } |
1429 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1430 | if (interp_sect) | |
1431 | { | |
6c95b8df | 1432 | info->interp_plt_sect_low = |
13437d4b | 1433 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1434 | info->interp_plt_sect_high = |
1435 | info->interp_plt_sect_low | |
1436 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1437 | } |
1438 | ||
1439 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1440 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1441 | { | |
2bbe3cc1 | 1442 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); |
13437d4b KB |
1443 | if (sym_addr != 0) |
1444 | break; | |
1445 | } | |
1446 | ||
2bbe3cc1 DJ |
1447 | if (sym_addr != 0) |
1448 | /* Convert 'sym_addr' from a function pointer to an address. | |
1449 | Because we pass tmp_bfd_target instead of the current | |
1450 | target, this will always produce an unrelocated value. */ | |
1cf3db46 | 1451 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
2bbe3cc1 DJ |
1452 | sym_addr, |
1453 | tmp_bfd_target); | |
1454 | ||
2f4950cd AC |
1455 | /* We're done with both the temporary bfd and target. Remember, |
1456 | closing the target closes the underlying bfd. */ | |
1457 | target_close (tmp_bfd_target, 0); | |
13437d4b KB |
1458 | |
1459 | if (sym_addr != 0) | |
1460 | { | |
a6d9a66e | 1461 | create_solib_event_breakpoint (target_gdbarch, load_addr + sym_addr); |
97ec2c2f | 1462 | xfree (interp_name); |
13437d4b KB |
1463 | return 1; |
1464 | } | |
1465 | ||
1466 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1467 | linker. Warn and drop into the old code. */ | |
1468 | bkpt_at_symbol: | |
97ec2c2f | 1469 | xfree (interp_name); |
82d03102 PG |
1470 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
1471 | "GDB will be unable to debug shared library initializers\n" | |
1472 | "and track explicitly loaded dynamic code.")); | |
13437d4b | 1473 | } |
13437d4b | 1474 | |
e499d0f1 DJ |
1475 | /* Scan through the lists of symbols, trying to look up the symbol and |
1476 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1477 | ||
1478 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1479 | { | |
1480 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1481 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1482 | { | |
de64a9ac JM |
1483 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
1484 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, | |
1485 | sym_addr, | |
1486 | ¤t_target); | |
1487 | create_solib_event_breakpoint (target_gdbarch, sym_addr); | |
e499d0f1 DJ |
1488 | return 1; |
1489 | } | |
1490 | } | |
13437d4b | 1491 | |
13437d4b KB |
1492 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) |
1493 | { | |
1494 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1495 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1496 | { | |
de64a9ac JM |
1497 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
1498 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, | |
1499 | sym_addr, | |
1500 | ¤t_target); | |
1501 | create_solib_event_breakpoint (target_gdbarch, sym_addr); | |
13437d4b KB |
1502 | return 1; |
1503 | } | |
1504 | } | |
542c95c2 | 1505 | return 0; |
13437d4b KB |
1506 | } |
1507 | ||
1508 | /* | |
1509 | ||
1510 | LOCAL FUNCTION | |
1511 | ||
1512 | special_symbol_handling -- additional shared library symbol handling | |
1513 | ||
1514 | SYNOPSIS | |
1515 | ||
1516 | void special_symbol_handling () | |
1517 | ||
1518 | DESCRIPTION | |
1519 | ||
1520 | Once the symbols from a shared object have been loaded in the usual | |
1521 | way, we are called to do any system specific symbol handling that | |
1522 | is needed. | |
1523 | ||
ab31aa69 | 1524 | For SunOS4, this consisted of grunging around in the dynamic |
13437d4b KB |
1525 | linkers structures to find symbol definitions for "common" symbols |
1526 | and adding them to the minimal symbol table for the runtime common | |
1527 | objfile. | |
1528 | ||
ab31aa69 KB |
1529 | However, for SVR4, there's nothing to do. |
1530 | ||
13437d4b KB |
1531 | */ |
1532 | ||
1533 | static void | |
1534 | svr4_special_symbol_handling (void) | |
1535 | { | |
13437d4b KB |
1536 | } |
1537 | ||
e2a44558 KB |
1538 | /* Relocate the main executable. This function should be called upon |
1539 | stopping the inferior process at the entry point to the program. | |
1540 | The entry point from BFD is compared to the PC and if they are | |
1541 | different, the main executable is relocated by the proper amount. | |
1542 | ||
1543 | As written it will only attempt to relocate executables which | |
1544 | lack interpreter sections. It seems likely that only dynamic | |
1545 | linker executables will get relocated, though it should work | |
1546 | properly for a position-independent static executable as well. */ | |
1547 | ||
1548 | static void | |
1549 | svr4_relocate_main_executable (void) | |
1550 | { | |
1551 | asection *interp_sect; | |
c2250ad1 UW |
1552 | struct regcache *regcache |
1553 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch); | |
fb14de7b | 1554 | CORE_ADDR pc = regcache_read_pc (regcache); |
e2a44558 KB |
1555 | |
1556 | /* Decide if the objfile needs to be relocated. As indicated above, | |
1557 | we will only be here when execution is stopped at the beginning | |
1558 | of the program. Relocation is necessary if the address at which | |
1559 | we are presently stopped differs from the start address stored in | |
1560 | the executable AND there's no interpreter section. The condition | |
1561 | regarding the interpreter section is very important because if | |
1562 | there *is* an interpreter section, execution will begin there | |
1563 | instead. When there is an interpreter section, the start address | |
1564 | is (presumably) used by the interpreter at some point to start | |
1565 | execution of the program. | |
1566 | ||
1567 | If there is an interpreter, it is normal for it to be set to an | |
1568 | arbitrary address at the outset. The job of finding it is | |
1569 | handled in enable_break(). | |
1570 | ||
1571 | So, to summarize, relocations are necessary when there is no | |
1572 | interpreter section and the start address obtained from the | |
1573 | executable is different from the address at which GDB is | |
1574 | currently stopped. | |
1575 | ||
1576 | [ The astute reader will note that we also test to make sure that | |
1577 | the executable in question has the DYNAMIC flag set. It is my | |
1578 | opinion that this test is unnecessary (undesirable even). It | |
1579 | was added to avoid inadvertent relocation of an executable | |
1580 | whose e_type member in the ELF header is not ET_DYN. There may | |
1581 | be a time in the future when it is desirable to do relocations | |
1582 | on other types of files as well in which case this condition | |
1583 | should either be removed or modified to accomodate the new file | |
1584 | type. (E.g, an ET_EXEC executable which has been built to be | |
1585 | position-independent could safely be relocated by the OS if | |
1586 | desired. It is true that this violates the ABI, but the ABI | |
1587 | has been known to be bent from time to time.) - Kevin, Nov 2000. ] | |
1588 | */ | |
1589 | ||
1590 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1591 | if (interp_sect == NULL | |
1592 | && (bfd_get_file_flags (exec_bfd) & DYNAMIC) != 0 | |
2f4950cd | 1593 | && (exec_entry_point (exec_bfd, &exec_ops) != pc)) |
e2a44558 KB |
1594 | { |
1595 | struct cleanup *old_chain; | |
1596 | struct section_offsets *new_offsets; | |
1597 | int i, changed; | |
1598 | CORE_ADDR displacement; | |
1599 | ||
1600 | /* It is necessary to relocate the objfile. The amount to | |
1601 | relocate by is simply the address at which we are stopped | |
1602 | minus the starting address from the executable. | |
1603 | ||
1604 | We relocate all of the sections by the same amount. This | |
1605 | behavior is mandated by recent editions of the System V ABI. | |
1606 | According to the System V Application Binary Interface, | |
1607 | Edition 4.1, page 5-5: | |
1608 | ||
1609 | ... Though the system chooses virtual addresses for | |
1610 | individual processes, it maintains the segments' relative | |
1611 | positions. Because position-independent code uses relative | |
1612 | addressesing between segments, the difference between | |
1613 | virtual addresses in memory must match the difference | |
1614 | between virtual addresses in the file. The difference | |
1615 | between the virtual address of any segment in memory and | |
1616 | the corresponding virtual address in the file is thus a | |
1617 | single constant value for any one executable or shared | |
1618 | object in a given process. This difference is the base | |
1619 | address. One use of the base address is to relocate the | |
1620 | memory image of the program during dynamic linking. | |
1621 | ||
1622 | The same language also appears in Edition 4.0 of the System V | |
1623 | ABI and is left unspecified in some of the earlier editions. */ | |
1624 | ||
2f4950cd | 1625 | displacement = pc - exec_entry_point (exec_bfd, &exec_ops); |
e2a44558 KB |
1626 | changed = 0; |
1627 | ||
13fc0c2f KB |
1628 | new_offsets = xcalloc (symfile_objfile->num_sections, |
1629 | sizeof (struct section_offsets)); | |
b8c9b27d | 1630 | old_chain = make_cleanup (xfree, new_offsets); |
e2a44558 KB |
1631 | |
1632 | for (i = 0; i < symfile_objfile->num_sections; i++) | |
1633 | { | |
1634 | if (displacement != ANOFFSET (symfile_objfile->section_offsets, i)) | |
1635 | changed = 1; | |
1636 | new_offsets->offsets[i] = displacement; | |
1637 | } | |
1638 | ||
1639 | if (changed) | |
1640 | objfile_relocate (symfile_objfile, new_offsets); | |
1641 | ||
1642 | do_cleanups (old_chain); | |
1643 | } | |
1644 | } | |
1645 | ||
13437d4b KB |
1646 | /* |
1647 | ||
1648 | GLOBAL FUNCTION | |
1649 | ||
1650 | svr4_solib_create_inferior_hook -- shared library startup support | |
1651 | ||
1652 | SYNOPSIS | |
1653 | ||
7095b863 | 1654 | void svr4_solib_create_inferior_hook () |
13437d4b KB |
1655 | |
1656 | DESCRIPTION | |
1657 | ||
1658 | When gdb starts up the inferior, it nurses it along (through the | |
1659 | shell) until it is ready to execute it's first instruction. At this | |
1660 | point, this function gets called via expansion of the macro | |
1661 | SOLIB_CREATE_INFERIOR_HOOK. | |
1662 | ||
1663 | For SunOS executables, this first instruction is typically the | |
1664 | one at "_start", or a similar text label, regardless of whether | |
1665 | the executable is statically or dynamically linked. The runtime | |
1666 | startup code takes care of dynamically linking in any shared | |
1667 | libraries, once gdb allows the inferior to continue. | |
1668 | ||
1669 | For SVR4 executables, this first instruction is either the first | |
1670 | instruction in the dynamic linker (for dynamically linked | |
1671 | executables) or the instruction at "start" for statically linked | |
1672 | executables. For dynamically linked executables, the system | |
1673 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1674 | and starts it running. The dynamic linker maps in any needed | |
1675 | shared libraries, maps in the actual user executable, and then | |
1676 | jumps to "start" in the user executable. | |
1677 | ||
1678 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1679 | can arrange to cooperate with the dynamic linker to discover the | |
1680 | names of shared libraries that are dynamically linked, and the | |
1681 | base addresses to which they are linked. | |
1682 | ||
1683 | This function is responsible for discovering those names and | |
1684 | addresses, and saving sufficient information about them to allow | |
1685 | their symbols to be read at a later time. | |
1686 | ||
1687 | FIXME | |
1688 | ||
1689 | Between enable_break() and disable_break(), this code does not | |
1690 | properly handle hitting breakpoints which the user might have | |
1691 | set in the startup code or in the dynamic linker itself. Proper | |
1692 | handling will probably have to wait until the implementation is | |
1693 | changed to use the "breakpoint handler function" method. | |
1694 | ||
1695 | Also, what if child has exit()ed? Must exit loop somehow. | |
1696 | */ | |
1697 | ||
e2a44558 | 1698 | static void |
13437d4b KB |
1699 | svr4_solib_create_inferior_hook (void) |
1700 | { | |
d6b48e9c | 1701 | struct inferior *inf; |
2020b7ab | 1702 | struct thread_info *tp; |
1a816a87 PA |
1703 | struct svr4_info *info; |
1704 | ||
6c95b8df | 1705 | info = get_svr4_info (); |
2020b7ab | 1706 | |
e2a44558 KB |
1707 | /* Relocate the main executable if necessary. */ |
1708 | svr4_relocate_main_executable (); | |
1709 | ||
d5a921c9 | 1710 | if (!svr4_have_link_map_offsets ()) |
513f5903 | 1711 | return; |
d5a921c9 | 1712 | |
1a816a87 | 1713 | if (!enable_break (info)) |
542c95c2 | 1714 | return; |
13437d4b | 1715 | |
ab31aa69 KB |
1716 | #if defined(_SCO_DS) |
1717 | /* SCO needs the loop below, other systems should be using the | |
13437d4b KB |
1718 | special shared library breakpoints and the shared library breakpoint |
1719 | service routine. | |
1720 | ||
1721 | Now run the target. It will eventually hit the breakpoint, at | |
1722 | which point all of the libraries will have been mapped in and we | |
1723 | can go groveling around in the dynamic linker structures to find | |
1724 | out what we need to know about them. */ | |
1725 | ||
d6b48e9c | 1726 | inf = current_inferior (); |
2020b7ab PA |
1727 | tp = inferior_thread (); |
1728 | ||
13437d4b | 1729 | clear_proceed_status (); |
d6b48e9c | 1730 | inf->stop_soon = STOP_QUIETLY; |
2020b7ab | 1731 | tp->stop_signal = TARGET_SIGNAL_0; |
13437d4b KB |
1732 | do |
1733 | { | |
2020b7ab | 1734 | target_resume (pid_to_ptid (-1), 0, tp->stop_signal); |
ae123ec6 | 1735 | wait_for_inferior (0); |
13437d4b | 1736 | } |
2020b7ab | 1737 | while (tp->stop_signal != TARGET_SIGNAL_TRAP); |
d6b48e9c | 1738 | inf->stop_soon = NO_STOP_QUIETLY; |
ab31aa69 | 1739 | #endif /* defined(_SCO_DS) */ |
13437d4b KB |
1740 | } |
1741 | ||
1742 | static void | |
1743 | svr4_clear_solib (void) | |
1744 | { | |
6c95b8df PA |
1745 | struct svr4_info *info; |
1746 | ||
1747 | info = get_svr4_info (); | |
1748 | info->debug_base = 0; | |
1749 | info->debug_loader_offset_p = 0; | |
1750 | info->debug_loader_offset = 0; | |
1751 | xfree (info->debug_loader_name); | |
1752 | info->debug_loader_name = NULL; | |
13437d4b KB |
1753 | } |
1754 | ||
1755 | static void | |
1756 | svr4_free_so (struct so_list *so) | |
1757 | { | |
b8c9b27d KB |
1758 | xfree (so->lm_info->lm); |
1759 | xfree (so->lm_info); | |
13437d4b KB |
1760 | } |
1761 | ||
6bb7be43 JB |
1762 | |
1763 | /* Clear any bits of ADDR that wouldn't fit in a target-format | |
1764 | data pointer. "Data pointer" here refers to whatever sort of | |
1765 | address the dynamic linker uses to manage its sections. At the | |
1766 | moment, we don't support shared libraries on any processors where | |
1767 | code and data pointers are different sizes. | |
1768 | ||
1769 | This isn't really the right solution. What we really need here is | |
1770 | a way to do arithmetic on CORE_ADDR values that respects the | |
1771 | natural pointer/address correspondence. (For example, on the MIPS, | |
1772 | converting a 32-bit pointer to a 64-bit CORE_ADDR requires you to | |
1773 | sign-extend the value. There, simply truncating the bits above | |
819844ad | 1774 | gdbarch_ptr_bit, as we do below, is no good.) This should probably |
6bb7be43 JB |
1775 | be a new gdbarch method or something. */ |
1776 | static CORE_ADDR | |
1777 | svr4_truncate_ptr (CORE_ADDR addr) | |
1778 | { | |
1cf3db46 | 1779 | if (gdbarch_ptr_bit (target_gdbarch) == sizeof (CORE_ADDR) * 8) |
6bb7be43 JB |
1780 | /* We don't need to truncate anything, and the bit twiddling below |
1781 | will fail due to overflow problems. */ | |
1782 | return addr; | |
1783 | else | |
1cf3db46 | 1784 | return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch)) - 1); |
6bb7be43 JB |
1785 | } |
1786 | ||
1787 | ||
749499cb KB |
1788 | static void |
1789 | svr4_relocate_section_addresses (struct so_list *so, | |
0542c86d | 1790 | struct target_section *sec) |
749499cb | 1791 | { |
cc10cae3 AO |
1792 | sec->addr = svr4_truncate_ptr (sec->addr + LM_ADDR_CHECK (so, |
1793 | sec->bfd)); | |
1794 | sec->endaddr = svr4_truncate_ptr (sec->endaddr + LM_ADDR_CHECK (so, | |
1795 | sec->bfd)); | |
749499cb | 1796 | } |
4b188b9f | 1797 | \f |
749499cb | 1798 | |
4b188b9f | 1799 | /* Architecture-specific operations. */ |
6bb7be43 | 1800 | |
4b188b9f MK |
1801 | /* Per-architecture data key. */ |
1802 | static struct gdbarch_data *solib_svr4_data; | |
e5e2b9ff | 1803 | |
4b188b9f | 1804 | struct solib_svr4_ops |
e5e2b9ff | 1805 | { |
4b188b9f MK |
1806 | /* Return a description of the layout of `struct link_map'. */ |
1807 | struct link_map_offsets *(*fetch_link_map_offsets)(void); | |
1808 | }; | |
e5e2b9ff | 1809 | |
4b188b9f | 1810 | /* Return a default for the architecture-specific operations. */ |
e5e2b9ff | 1811 | |
4b188b9f MK |
1812 | static void * |
1813 | solib_svr4_init (struct obstack *obstack) | |
e5e2b9ff | 1814 | { |
4b188b9f | 1815 | struct solib_svr4_ops *ops; |
e5e2b9ff | 1816 | |
4b188b9f | 1817 | ops = OBSTACK_ZALLOC (obstack, struct solib_svr4_ops); |
8d005789 | 1818 | ops->fetch_link_map_offsets = NULL; |
4b188b9f | 1819 | return ops; |
e5e2b9ff KB |
1820 | } |
1821 | ||
4b188b9f | 1822 | /* Set the architecture-specific `struct link_map_offsets' fetcher for |
7e3cb44c | 1823 | GDBARCH to FLMO. Also, install SVR4 solib_ops into GDBARCH. */ |
1c4dcb57 | 1824 | |
21479ded | 1825 | void |
e5e2b9ff KB |
1826 | set_solib_svr4_fetch_link_map_offsets (struct gdbarch *gdbarch, |
1827 | struct link_map_offsets *(*flmo) (void)) | |
21479ded | 1828 | { |
4b188b9f MK |
1829 | struct solib_svr4_ops *ops = gdbarch_data (gdbarch, solib_svr4_data); |
1830 | ||
1831 | ops->fetch_link_map_offsets = flmo; | |
7e3cb44c UW |
1832 | |
1833 | set_solib_ops (gdbarch, &svr4_so_ops); | |
21479ded KB |
1834 | } |
1835 | ||
4b188b9f MK |
1836 | /* Fetch a link_map_offsets structure using the architecture-specific |
1837 | `struct link_map_offsets' fetcher. */ | |
1c4dcb57 | 1838 | |
4b188b9f MK |
1839 | static struct link_map_offsets * |
1840 | svr4_fetch_link_map_offsets (void) | |
21479ded | 1841 | { |
1cf3db46 | 1842 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data); |
4b188b9f MK |
1843 | |
1844 | gdb_assert (ops->fetch_link_map_offsets); | |
1845 | return ops->fetch_link_map_offsets (); | |
21479ded KB |
1846 | } |
1847 | ||
4b188b9f MK |
1848 | /* Return 1 if a link map offset fetcher has been defined, 0 otherwise. */ |
1849 | ||
1850 | static int | |
1851 | svr4_have_link_map_offsets (void) | |
1852 | { | |
1cf3db46 | 1853 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data); |
4b188b9f MK |
1854 | return (ops->fetch_link_map_offsets != NULL); |
1855 | } | |
1856 | \f | |
1857 | ||
e4bbbda8 MK |
1858 | /* Most OS'es that have SVR4-style ELF dynamic libraries define a |
1859 | `struct r_debug' and a `struct link_map' that are binary compatible | |
1860 | with the origional SVR4 implementation. */ | |
1861 | ||
1862 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
1863 | for an ILP32 SVR4 system. */ | |
1864 | ||
1865 | struct link_map_offsets * | |
1866 | svr4_ilp32_fetch_link_map_offsets (void) | |
1867 | { | |
1868 | static struct link_map_offsets lmo; | |
1869 | static struct link_map_offsets *lmp = NULL; | |
1870 | ||
1871 | if (lmp == NULL) | |
1872 | { | |
1873 | lmp = &lmo; | |
1874 | ||
e4cd0d6a MK |
1875 | lmo.r_version_offset = 0; |
1876 | lmo.r_version_size = 4; | |
e4bbbda8 | 1877 | lmo.r_map_offset = 4; |
7cd25cfc | 1878 | lmo.r_brk_offset = 8; |
e4cd0d6a | 1879 | lmo.r_ldsomap_offset = 20; |
e4bbbda8 MK |
1880 | |
1881 | /* Everything we need is in the first 20 bytes. */ | |
1882 | lmo.link_map_size = 20; | |
1883 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 1884 | lmo.l_name_offset = 4; |
cc10cae3 | 1885 | lmo.l_ld_offset = 8; |
e4bbbda8 | 1886 | lmo.l_next_offset = 12; |
e4bbbda8 | 1887 | lmo.l_prev_offset = 16; |
e4bbbda8 MK |
1888 | } |
1889 | ||
1890 | return lmp; | |
1891 | } | |
1892 | ||
1893 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
1894 | for an LP64 SVR4 system. */ | |
1895 | ||
1896 | struct link_map_offsets * | |
1897 | svr4_lp64_fetch_link_map_offsets (void) | |
1898 | { | |
1899 | static struct link_map_offsets lmo; | |
1900 | static struct link_map_offsets *lmp = NULL; | |
1901 | ||
1902 | if (lmp == NULL) | |
1903 | { | |
1904 | lmp = &lmo; | |
1905 | ||
e4cd0d6a MK |
1906 | lmo.r_version_offset = 0; |
1907 | lmo.r_version_size = 4; | |
e4bbbda8 | 1908 | lmo.r_map_offset = 8; |
7cd25cfc | 1909 | lmo.r_brk_offset = 16; |
e4cd0d6a | 1910 | lmo.r_ldsomap_offset = 40; |
e4bbbda8 MK |
1911 | |
1912 | /* Everything we need is in the first 40 bytes. */ | |
1913 | lmo.link_map_size = 40; | |
1914 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 1915 | lmo.l_name_offset = 8; |
cc10cae3 | 1916 | lmo.l_ld_offset = 16; |
e4bbbda8 | 1917 | lmo.l_next_offset = 24; |
e4bbbda8 | 1918 | lmo.l_prev_offset = 32; |
e4bbbda8 MK |
1919 | } |
1920 | ||
1921 | return lmp; | |
1922 | } | |
1923 | \f | |
1924 | ||
7d522c90 | 1925 | struct target_so_ops svr4_so_ops; |
13437d4b | 1926 | |
3a40aaa0 UW |
1927 | /* Lookup global symbol for ELF DSOs linked with -Bsymbolic. Those DSOs have a |
1928 | different rule for symbol lookup. The lookup begins here in the DSO, not in | |
1929 | the main executable. */ | |
1930 | ||
1931 | static struct symbol * | |
1932 | elf_lookup_lib_symbol (const struct objfile *objfile, | |
1933 | const char *name, | |
1934 | const char *linkage_name, | |
21b556f4 | 1935 | const domain_enum domain) |
3a40aaa0 UW |
1936 | { |
1937 | if (objfile->obfd == NULL | |
1938 | || scan_dyntag (DT_SYMBOLIC, objfile->obfd, NULL) != 1) | |
1939 | return NULL; | |
1940 | ||
65728c26 | 1941 | return lookup_global_symbol_from_objfile |
21b556f4 | 1942 | (objfile, name, linkage_name, domain); |
3a40aaa0 UW |
1943 | } |
1944 | ||
a78f21af AC |
1945 | extern initialize_file_ftype _initialize_svr4_solib; /* -Wmissing-prototypes */ |
1946 | ||
13437d4b KB |
1947 | void |
1948 | _initialize_svr4_solib (void) | |
1949 | { | |
4b188b9f | 1950 | solib_svr4_data = gdbarch_data_register_pre_init (solib_svr4_init); |
6c95b8df PA |
1951 | solib_svr4_pspace_data |
1952 | = register_program_space_data_with_cleanup (svr4_pspace_data_cleanup); | |
4b188b9f | 1953 | |
749499cb | 1954 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b KB |
1955 | svr4_so_ops.free_so = svr4_free_so; |
1956 | svr4_so_ops.clear_solib = svr4_clear_solib; | |
1957 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
1958 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |
1959 | svr4_so_ops.current_sos = svr4_current_sos; | |
1960 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
d7fa2ae2 | 1961 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; |
831a0c44 | 1962 | svr4_so_ops.bfd_open = solib_bfd_open; |
3a40aaa0 | 1963 | svr4_so_ops.lookup_lib_global_symbol = elf_lookup_lib_symbol; |
a7c02bc8 | 1964 | svr4_so_ops.same = svr4_same; |
de18c1d8 | 1965 | svr4_so_ops.keep_data_in_core = svr4_keep_data_in_core; |
13437d4b | 1966 | } |