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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; | |
28f34a8f | 179 | CORE_ADDR l_addr, l_dynaddr, dynaddr; |
cc10cae3 AO |
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 | { | |
28f34a8f | 196 | CORE_ADDR align = 0x1000; |
4e1fc9c9 | 197 | CORE_ADDR minpagesize = align; |
28f34a8f | 198 | |
cc10cae3 AO |
199 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
200 | { | |
201 | Elf_Internal_Ehdr *ehdr = elf_tdata (abfd)->elf_header; | |
202 | Elf_Internal_Phdr *phdr = elf_tdata (abfd)->phdr; | |
203 | int i; | |
204 | ||
205 | align = 1; | |
206 | ||
207 | for (i = 0; i < ehdr->e_phnum; i++) | |
208 | if (phdr[i].p_type == PT_LOAD && phdr[i].p_align > align) | |
209 | align = phdr[i].p_align; | |
4e1fc9c9 JK |
210 | |
211 | minpagesize = get_elf_backend_data (abfd)->minpagesize; | |
cc10cae3 AO |
212 | } |
213 | ||
214 | /* Turn it into a mask. */ | |
215 | align--; | |
216 | ||
217 | /* If the changes match the alignment requirements, we | |
218 | assume we're using a core file that was generated by the | |
219 | same binary, just prelinked with a different base offset. | |
220 | If it doesn't match, we may have a different binary, the | |
221 | same binary with the dynamic table loaded at an unrelated | |
222 | location, or anything, really. To avoid regressions, | |
223 | don't adjust the base offset in the latter case, although | |
224 | odds are that, if things really changed, debugging won't | |
5c0d192f JK |
225 | quite work. |
226 | ||
227 | One could expect more the condition | |
228 | ((l_addr & align) == 0 && ((l_dynaddr - dynaddr) & align) == 0) | |
229 | but the one below is relaxed for PPC. The PPC kernel supports | |
230 | either 4k or 64k page sizes. To be prepared for 64k pages, | |
231 | PPC ELF files are built using an alignment requirement of 64k. | |
232 | However, when running on a kernel supporting 4k pages, the memory | |
233 | mapping of the library may not actually happen on a 64k boundary! | |
234 | ||
235 | (In the usual case where (l_addr & align) == 0, this check is | |
4e1fc9c9 JK |
236 | equivalent to the possibly expected check above.) |
237 | ||
238 | Even on PPC it must be zero-aligned at least for MINPAGESIZE. */ | |
5c0d192f | 239 | |
4e1fc9c9 JK |
240 | if ((l_addr & (minpagesize - 1)) == 0 |
241 | && (l_addr & align) == ((l_dynaddr - dynaddr) & align)) | |
cc10cae3 AO |
242 | { |
243 | l_addr = l_dynaddr - dynaddr; | |
79d4c408 | 244 | |
701ed6dc JK |
245 | if (info_verbose) |
246 | { | |
247 | warning (_(".dynamic section for \"%s\" " | |
248 | "is not at the expected address"), so->so_name); | |
249 | warning (_("difference appears to be caused by prelink, " | |
250 | "adjusting expectations")); | |
251 | } | |
cc10cae3 | 252 | } |
79d4c408 DJ |
253 | else |
254 | warning (_(".dynamic section for \"%s\" " | |
255 | "is not at the expected address " | |
256 | "(wrong library or version mismatch?)"), so->so_name); | |
cc10cae3 AO |
257 | } |
258 | ||
259 | set_addr: | |
260 | so->lm_info->l_addr = l_addr; | |
261 | } | |
262 | ||
263 | return so->lm_info->l_addr; | |
264 | } | |
265 | ||
13437d4b KB |
266 | static CORE_ADDR |
267 | LM_NEXT (struct so_list *so) | |
268 | { | |
4b188b9f | 269 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 270 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 271 | |
cfaefc65 | 272 | return extract_typed_address (so->lm_info->lm + lmo->l_next_offset, |
b6da22b0 | 273 | ptr_type); |
13437d4b KB |
274 | } |
275 | ||
276 | static CORE_ADDR | |
277 | LM_NAME (struct so_list *so) | |
278 | { | |
4b188b9f | 279 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 280 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 281 | |
cfaefc65 | 282 | return extract_typed_address (so->lm_info->lm + lmo->l_name_offset, |
b6da22b0 | 283 | ptr_type); |
13437d4b KB |
284 | } |
285 | ||
13437d4b KB |
286 | static int |
287 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
288 | { | |
4b188b9f | 289 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 290 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 291 | |
e499d0f1 DJ |
292 | /* Assume that everything is a library if the dynamic loader was loaded |
293 | late by a static executable. */ | |
0763ab81 | 294 | if (exec_bfd && bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL) |
e499d0f1 DJ |
295 | return 0; |
296 | ||
cfaefc65 | 297 | return extract_typed_address (so->lm_info->lm + lmo->l_prev_offset, |
b6da22b0 | 298 | ptr_type) == 0; |
13437d4b KB |
299 | } |
300 | ||
6c95b8df | 301 | /* Per pspace SVR4 specific data. */ |
13437d4b | 302 | |
1a816a87 PA |
303 | struct svr4_info |
304 | { | |
1a816a87 PA |
305 | CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
306 | ||
307 | /* Validity flag for debug_loader_offset. */ | |
308 | int debug_loader_offset_p; | |
309 | ||
310 | /* Load address for the dynamic linker, inferred. */ | |
311 | CORE_ADDR debug_loader_offset; | |
312 | ||
313 | /* Name of the dynamic linker, valid if debug_loader_offset_p. */ | |
314 | char *debug_loader_name; | |
315 | ||
316 | /* Load map address for the main executable. */ | |
317 | CORE_ADDR main_lm_addr; | |
1a816a87 | 318 | |
6c95b8df PA |
319 | CORE_ADDR interp_text_sect_low; |
320 | CORE_ADDR interp_text_sect_high; | |
321 | CORE_ADDR interp_plt_sect_low; | |
322 | CORE_ADDR interp_plt_sect_high; | |
323 | }; | |
1a816a87 | 324 | |
6c95b8df PA |
325 | /* Per-program-space data key. */ |
326 | static const struct program_space_data *solib_svr4_pspace_data; | |
1a816a87 | 327 | |
6c95b8df PA |
328 | static void |
329 | svr4_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
1a816a87 | 330 | { |
6c95b8df | 331 | struct svr4_info *info; |
1a816a87 | 332 | |
6c95b8df PA |
333 | info = program_space_data (pspace, solib_svr4_pspace_data); |
334 | xfree (info); | |
1a816a87 PA |
335 | } |
336 | ||
6c95b8df PA |
337 | /* Get the current svr4 data. If none is found yet, add it now. This |
338 | function always returns a valid object. */ | |
34439770 | 339 | |
6c95b8df PA |
340 | static struct svr4_info * |
341 | get_svr4_info (void) | |
1a816a87 | 342 | { |
6c95b8df | 343 | struct svr4_info *info; |
1a816a87 | 344 | |
6c95b8df PA |
345 | info = program_space_data (current_program_space, solib_svr4_pspace_data); |
346 | if (info != NULL) | |
347 | return info; | |
34439770 | 348 | |
6c95b8df PA |
349 | info = XZALLOC (struct svr4_info); |
350 | set_program_space_data (current_program_space, solib_svr4_pspace_data, info); | |
351 | return info; | |
1a816a87 | 352 | } |
93a57060 | 353 | |
13437d4b KB |
354 | /* Local function prototypes */ |
355 | ||
356 | static int match_main (char *); | |
357 | ||
2bbe3cc1 | 358 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *); |
13437d4b KB |
359 | |
360 | /* | |
361 | ||
362 | LOCAL FUNCTION | |
363 | ||
364 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
365 | ||
366 | SYNOPSIS | |
367 | ||
2bbe3cc1 | 368 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) |
13437d4b KB |
369 | |
370 | DESCRIPTION | |
371 | ||
372 | An expensive way to lookup the value of a single symbol for | |
373 | bfd's that are only temporary anyway. This is used by the | |
374 | shared library support to find the address of the debugger | |
2bbe3cc1 | 375 | notification routine in the shared library. |
13437d4b | 376 | |
2bbe3cc1 DJ |
377 | The returned symbol may be in a code or data section; functions |
378 | will normally be in a code section, but may be in a data section | |
379 | if this architecture uses function descriptors. | |
87f84c9d | 380 | |
13437d4b KB |
381 | Note that 0 is specifically allowed as an error return (no |
382 | such symbol). | |
383 | */ | |
384 | ||
385 | static CORE_ADDR | |
2bbe3cc1 | 386 | bfd_lookup_symbol (bfd *abfd, char *symname) |
13437d4b | 387 | { |
435b259c | 388 | long storage_needed; |
13437d4b KB |
389 | asymbol *sym; |
390 | asymbol **symbol_table; | |
391 | unsigned int number_of_symbols; | |
392 | unsigned int i; | |
393 | struct cleanup *back_to; | |
394 | CORE_ADDR symaddr = 0; | |
395 | ||
396 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
397 | ||
398 | if (storage_needed > 0) | |
399 | { | |
400 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 401 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
402 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
403 | ||
404 | for (i = 0; i < number_of_symbols; i++) | |
405 | { | |
406 | sym = *symbol_table++; | |
6314a349 | 407 | if (strcmp (sym->name, symname) == 0 |
2bbe3cc1 | 408 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) |
13437d4b | 409 | { |
2bbe3cc1 | 410 | /* BFD symbols are section relative. */ |
13437d4b KB |
411 | symaddr = sym->value + sym->section->vma; |
412 | break; | |
413 | } | |
414 | } | |
415 | do_cleanups (back_to); | |
416 | } | |
417 | ||
418 | if (symaddr) | |
419 | return symaddr; | |
420 | ||
421 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll | |
422 | have to check the dynamic string table too. */ | |
423 | ||
424 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
425 | ||
426 | if (storage_needed > 0) | |
427 | { | |
428 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 429 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
430 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table); |
431 | ||
432 | for (i = 0; i < number_of_symbols; i++) | |
433 | { | |
434 | sym = *symbol_table++; | |
87f84c9d | 435 | |
6314a349 | 436 | if (strcmp (sym->name, symname) == 0 |
2bbe3cc1 | 437 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) |
13437d4b | 438 | { |
2bbe3cc1 | 439 | /* BFD symbols are section relative. */ |
13437d4b KB |
440 | symaddr = sym->value + sym->section->vma; |
441 | break; | |
442 | } | |
443 | } | |
444 | do_cleanups (back_to); | |
445 | } | |
446 | ||
447 | return symaddr; | |
448 | } | |
449 | ||
97ec2c2f UW |
450 | |
451 | /* Read program header TYPE from inferior memory. The header is found | |
452 | by scanning the OS auxillary vector. | |
453 | ||
454 | Return a pointer to allocated memory holding the program header contents, | |
455 | or NULL on failure. If sucessful, and unless P_SECT_SIZE is NULL, the | |
456 | size of those contents is returned to P_SECT_SIZE. Likewise, the target | |
457 | architecture size (32-bit or 64-bit) is returned to P_ARCH_SIZE. */ | |
458 | ||
459 | static gdb_byte * | |
460 | read_program_header (int type, int *p_sect_size, int *p_arch_size) | |
461 | { | |
e17a4113 | 462 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
97ec2c2f UW |
463 | CORE_ADDR at_phdr, at_phent, at_phnum; |
464 | int arch_size, sect_size; | |
465 | CORE_ADDR sect_addr; | |
466 | gdb_byte *buf; | |
467 | ||
468 | /* Get required auxv elements from target. */ | |
469 | if (target_auxv_search (¤t_target, AT_PHDR, &at_phdr) <= 0) | |
470 | return 0; | |
471 | if (target_auxv_search (¤t_target, AT_PHENT, &at_phent) <= 0) | |
472 | return 0; | |
473 | if (target_auxv_search (¤t_target, AT_PHNUM, &at_phnum) <= 0) | |
474 | return 0; | |
475 | if (!at_phdr || !at_phnum) | |
476 | return 0; | |
477 | ||
478 | /* Determine ELF architecture type. */ | |
479 | if (at_phent == sizeof (Elf32_External_Phdr)) | |
480 | arch_size = 32; | |
481 | else if (at_phent == sizeof (Elf64_External_Phdr)) | |
482 | arch_size = 64; | |
483 | else | |
484 | return 0; | |
485 | ||
486 | /* Find .dynamic section via the PT_DYNAMIC PHDR. */ | |
487 | if (arch_size == 32) | |
488 | { | |
489 | Elf32_External_Phdr phdr; | |
490 | int i; | |
491 | ||
492 | /* Search for requested PHDR. */ | |
493 | for (i = 0; i < at_phnum; i++) | |
494 | { | |
495 | if (target_read_memory (at_phdr + i * sizeof (phdr), | |
496 | (gdb_byte *)&phdr, sizeof (phdr))) | |
497 | return 0; | |
498 | ||
e17a4113 UW |
499 | if (extract_unsigned_integer ((gdb_byte *)phdr.p_type, |
500 | 4, byte_order) == type) | |
97ec2c2f UW |
501 | break; |
502 | } | |
503 | ||
504 | if (i == at_phnum) | |
505 | return 0; | |
506 | ||
507 | /* Retrieve address and size. */ | |
e17a4113 UW |
508 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
509 | 4, byte_order); | |
510 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
511 | 4, byte_order); | |
97ec2c2f UW |
512 | } |
513 | else | |
514 | { | |
515 | Elf64_External_Phdr phdr; | |
516 | int i; | |
517 | ||
518 | /* Search for requested PHDR. */ | |
519 | for (i = 0; i < at_phnum; i++) | |
520 | { | |
521 | if (target_read_memory (at_phdr + i * sizeof (phdr), | |
522 | (gdb_byte *)&phdr, sizeof (phdr))) | |
523 | return 0; | |
524 | ||
e17a4113 UW |
525 | if (extract_unsigned_integer ((gdb_byte *)phdr.p_type, |
526 | 4, byte_order) == type) | |
97ec2c2f UW |
527 | break; |
528 | } | |
529 | ||
530 | if (i == at_phnum) | |
531 | return 0; | |
532 | ||
533 | /* Retrieve address and size. */ | |
e17a4113 UW |
534 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
535 | 8, byte_order); | |
536 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
537 | 8, byte_order); | |
97ec2c2f UW |
538 | } |
539 | ||
540 | /* Read in requested program header. */ | |
541 | buf = xmalloc (sect_size); | |
542 | if (target_read_memory (sect_addr, buf, sect_size)) | |
543 | { | |
544 | xfree (buf); | |
545 | return NULL; | |
546 | } | |
547 | ||
548 | if (p_arch_size) | |
549 | *p_arch_size = arch_size; | |
550 | if (p_sect_size) | |
551 | *p_sect_size = sect_size; | |
552 | ||
553 | return buf; | |
554 | } | |
555 | ||
556 | ||
557 | /* Return program interpreter string. */ | |
558 | static gdb_byte * | |
559 | find_program_interpreter (void) | |
560 | { | |
561 | gdb_byte *buf = NULL; | |
562 | ||
563 | /* If we have an exec_bfd, use its section table. */ | |
564 | if (exec_bfd | |
565 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
566 | { | |
567 | struct bfd_section *interp_sect; | |
568 | ||
569 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
570 | if (interp_sect != NULL) | |
571 | { | |
572 | CORE_ADDR sect_addr = bfd_section_vma (exec_bfd, interp_sect); | |
573 | int sect_size = bfd_section_size (exec_bfd, interp_sect); | |
574 | ||
575 | buf = xmalloc (sect_size); | |
576 | bfd_get_section_contents (exec_bfd, interp_sect, buf, 0, sect_size); | |
577 | } | |
578 | } | |
579 | ||
580 | /* If we didn't find it, use the target auxillary vector. */ | |
581 | if (!buf) | |
582 | buf = read_program_header (PT_INTERP, NULL, NULL); | |
583 | ||
584 | return buf; | |
585 | } | |
586 | ||
587 | ||
3a40aaa0 UW |
588 | /* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is |
589 | returned and the corresponding PTR is set. */ | |
590 | ||
591 | static int | |
592 | scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr) | |
593 | { | |
594 | int arch_size, step, sect_size; | |
595 | long dyn_tag; | |
b381ea14 | 596 | CORE_ADDR dyn_ptr, dyn_addr; |
65728c26 | 597 | gdb_byte *bufend, *bufstart, *buf; |
3a40aaa0 UW |
598 | Elf32_External_Dyn *x_dynp_32; |
599 | Elf64_External_Dyn *x_dynp_64; | |
600 | struct bfd_section *sect; | |
61f0d762 | 601 | struct target_section *target_section; |
3a40aaa0 UW |
602 | |
603 | if (abfd == NULL) | |
604 | return 0; | |
0763ab81 PA |
605 | |
606 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
607 | return 0; | |
608 | ||
3a40aaa0 UW |
609 | arch_size = bfd_get_arch_size (abfd); |
610 | if (arch_size == -1) | |
0763ab81 | 611 | return 0; |
3a40aaa0 UW |
612 | |
613 | /* Find the start address of the .dynamic section. */ | |
614 | sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
615 | if (sect == NULL) | |
616 | return 0; | |
61f0d762 JK |
617 | |
618 | for (target_section = current_target_sections->sections; | |
619 | target_section < current_target_sections->sections_end; | |
620 | target_section++) | |
621 | if (sect == target_section->the_bfd_section) | |
622 | break; | |
b381ea14 JK |
623 | if (target_section < current_target_sections->sections_end) |
624 | dyn_addr = target_section->addr; | |
625 | else | |
626 | { | |
627 | /* ABFD may come from OBJFILE acting only as a symbol file without being | |
628 | loaded into the target (see add_symbol_file_command). This case is | |
629 | such fallback to the file VMA address without the possibility of | |
630 | having the section relocated to its actual in-memory address. */ | |
631 | ||
632 | dyn_addr = bfd_section_vma (abfd, sect); | |
633 | } | |
3a40aaa0 | 634 | |
65728c26 DJ |
635 | /* Read in .dynamic from the BFD. We will get the actual value |
636 | from memory later. */ | |
3a40aaa0 | 637 | sect_size = bfd_section_size (abfd, sect); |
65728c26 DJ |
638 | buf = bufstart = alloca (sect_size); |
639 | if (!bfd_get_section_contents (abfd, sect, | |
640 | buf, 0, sect_size)) | |
641 | return 0; | |
3a40aaa0 UW |
642 | |
643 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
644 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
645 | : sizeof (Elf64_External_Dyn); | |
646 | for (bufend = buf + sect_size; | |
647 | buf < bufend; | |
648 | buf += step) | |
649 | { | |
650 | if (arch_size == 32) | |
651 | { | |
652 | x_dynp_32 = (Elf32_External_Dyn *) buf; | |
653 | dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag); | |
654 | dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr); | |
655 | } | |
65728c26 | 656 | else |
3a40aaa0 UW |
657 | { |
658 | x_dynp_64 = (Elf64_External_Dyn *) buf; | |
659 | dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag); | |
660 | dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr); | |
661 | } | |
662 | if (dyn_tag == DT_NULL) | |
663 | return 0; | |
664 | if (dyn_tag == dyntag) | |
665 | { | |
65728c26 DJ |
666 | /* If requested, try to read the runtime value of this .dynamic |
667 | entry. */ | |
3a40aaa0 | 668 | if (ptr) |
65728c26 | 669 | { |
b6da22b0 | 670 | struct type *ptr_type; |
65728c26 DJ |
671 | gdb_byte ptr_buf[8]; |
672 | CORE_ADDR ptr_addr; | |
673 | ||
b6da22b0 | 674 | ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
b381ea14 | 675 | ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8; |
65728c26 | 676 | if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0) |
b6da22b0 | 677 | dyn_ptr = extract_typed_address (ptr_buf, ptr_type); |
65728c26 DJ |
678 | *ptr = dyn_ptr; |
679 | } | |
680 | return 1; | |
3a40aaa0 UW |
681 | } |
682 | } | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
97ec2c2f UW |
687 | /* Scan for DYNTAG in .dynamic section of the target's main executable, |
688 | found by consulting the OS auxillary vector. If DYNTAG is found 1 is | |
689 | returned and the corresponding PTR is set. */ | |
690 | ||
691 | static int | |
692 | scan_dyntag_auxv (int dyntag, CORE_ADDR *ptr) | |
693 | { | |
e17a4113 | 694 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
97ec2c2f UW |
695 | int sect_size, arch_size, step; |
696 | long dyn_tag; | |
697 | CORE_ADDR dyn_ptr; | |
698 | gdb_byte *bufend, *bufstart, *buf; | |
699 | ||
700 | /* Read in .dynamic section. */ | |
701 | buf = bufstart = read_program_header (PT_DYNAMIC, §_size, &arch_size); | |
702 | if (!buf) | |
703 | return 0; | |
704 | ||
705 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
706 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
707 | : sizeof (Elf64_External_Dyn); | |
708 | for (bufend = buf + sect_size; | |
709 | buf < bufend; | |
710 | buf += step) | |
711 | { | |
712 | if (arch_size == 32) | |
713 | { | |
714 | Elf32_External_Dyn *dynp = (Elf32_External_Dyn *) buf; | |
e17a4113 UW |
715 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
716 | 4, byte_order); | |
717 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
718 | 4, byte_order); | |
97ec2c2f UW |
719 | } |
720 | else | |
721 | { | |
722 | Elf64_External_Dyn *dynp = (Elf64_External_Dyn *) buf; | |
e17a4113 UW |
723 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
724 | 8, byte_order); | |
725 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
726 | 8, byte_order); | |
97ec2c2f UW |
727 | } |
728 | if (dyn_tag == DT_NULL) | |
729 | break; | |
730 | ||
731 | if (dyn_tag == dyntag) | |
732 | { | |
733 | if (ptr) | |
734 | *ptr = dyn_ptr; | |
735 | ||
736 | xfree (bufstart); | |
737 | return 1; | |
738 | } | |
739 | } | |
740 | ||
741 | xfree (bufstart); | |
742 | return 0; | |
743 | } | |
744 | ||
3a40aaa0 | 745 | |
13437d4b KB |
746 | /* |
747 | ||
748 | LOCAL FUNCTION | |
749 | ||
750 | elf_locate_base -- locate the base address of dynamic linker structs | |
751 | for SVR4 elf targets. | |
752 | ||
753 | SYNOPSIS | |
754 | ||
755 | CORE_ADDR elf_locate_base (void) | |
756 | ||
757 | DESCRIPTION | |
758 | ||
759 | For SVR4 elf targets the address of the dynamic linker's runtime | |
760 | structure is contained within the dynamic info section in the | |
761 | executable file. The dynamic section is also mapped into the | |
762 | inferior address space. Because the runtime loader fills in the | |
763 | real address before starting the inferior, we have to read in the | |
764 | dynamic info section from the inferior address space. | |
765 | If there are any errors while trying to find the address, we | |
766 | silently return 0, otherwise the found address is returned. | |
767 | ||
768 | */ | |
769 | ||
770 | static CORE_ADDR | |
771 | elf_locate_base (void) | |
772 | { | |
3a40aaa0 UW |
773 | struct minimal_symbol *msymbol; |
774 | CORE_ADDR dyn_ptr; | |
13437d4b | 775 | |
65728c26 DJ |
776 | /* Look for DT_MIPS_RLD_MAP first. MIPS executables use this |
777 | instead of DT_DEBUG, although they sometimes contain an unused | |
778 | DT_DEBUG. */ | |
97ec2c2f UW |
779 | if (scan_dyntag (DT_MIPS_RLD_MAP, exec_bfd, &dyn_ptr) |
780 | || scan_dyntag_auxv (DT_MIPS_RLD_MAP, &dyn_ptr)) | |
3a40aaa0 | 781 | { |
b6da22b0 | 782 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
3a40aaa0 | 783 | gdb_byte *pbuf; |
b6da22b0 | 784 | int pbuf_size = TYPE_LENGTH (ptr_type); |
3a40aaa0 UW |
785 | pbuf = alloca (pbuf_size); |
786 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
787 | of the dynamic link structure. */ | |
788 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) | |
e499d0f1 | 789 | return 0; |
b6da22b0 | 790 | return extract_typed_address (pbuf, ptr_type); |
e499d0f1 DJ |
791 | } |
792 | ||
65728c26 | 793 | /* Find DT_DEBUG. */ |
97ec2c2f UW |
794 | if (scan_dyntag (DT_DEBUG, exec_bfd, &dyn_ptr) |
795 | || scan_dyntag_auxv (DT_DEBUG, &dyn_ptr)) | |
65728c26 DJ |
796 | return dyn_ptr; |
797 | ||
3a40aaa0 UW |
798 | /* This may be a static executable. Look for the symbol |
799 | conventionally named _r_debug, as a last resort. */ | |
800 | msymbol = lookup_minimal_symbol ("_r_debug", NULL, symfile_objfile); | |
801 | if (msymbol != NULL) | |
802 | return SYMBOL_VALUE_ADDRESS (msymbol); | |
13437d4b KB |
803 | |
804 | /* DT_DEBUG entry not found. */ | |
805 | return 0; | |
806 | } | |
807 | ||
13437d4b KB |
808 | /* |
809 | ||
810 | LOCAL FUNCTION | |
811 | ||
812 | locate_base -- locate the base address of dynamic linker structs | |
813 | ||
814 | SYNOPSIS | |
815 | ||
1a816a87 | 816 | CORE_ADDR locate_base (struct svr4_info *) |
13437d4b KB |
817 | |
818 | DESCRIPTION | |
819 | ||
820 | For both the SunOS and SVR4 shared library implementations, if the | |
821 | inferior executable has been linked dynamically, there is a single | |
822 | address somewhere in the inferior's data space which is the key to | |
823 | locating all of the dynamic linker's runtime structures. This | |
824 | address is the value of the debug base symbol. The job of this | |
825 | function is to find and return that address, or to return 0 if there | |
826 | is no such address (the executable is statically linked for example). | |
827 | ||
828 | For SunOS, the job is almost trivial, since the dynamic linker and | |
829 | all of it's structures are statically linked to the executable at | |
830 | link time. Thus the symbol for the address we are looking for has | |
831 | already been added to the minimal symbol table for the executable's | |
832 | objfile at the time the symbol file's symbols were read, and all we | |
833 | have to do is look it up there. Note that we explicitly do NOT want | |
834 | to find the copies in the shared library. | |
835 | ||
836 | The SVR4 version is a bit more complicated because the address | |
837 | is contained somewhere in the dynamic info section. We have to go | |
838 | to a lot more work to discover the address of the debug base symbol. | |
839 | Because of this complexity, we cache the value we find and return that | |
840 | value on subsequent invocations. Note there is no copy in the | |
841 | executable symbol tables. | |
842 | ||
843 | */ | |
844 | ||
845 | static CORE_ADDR | |
1a816a87 | 846 | locate_base (struct svr4_info *info) |
13437d4b | 847 | { |
13437d4b KB |
848 | /* Check to see if we have a currently valid address, and if so, avoid |
849 | doing all this work again and just return the cached address. If | |
850 | we have no cached address, try to locate it in the dynamic info | |
d5a921c9 KB |
851 | section for ELF executables. There's no point in doing any of this |
852 | though if we don't have some link map offsets to work with. */ | |
13437d4b | 853 | |
1a816a87 | 854 | if (info->debug_base == 0 && svr4_have_link_map_offsets ()) |
0763ab81 | 855 | info->debug_base = elf_locate_base (); |
1a816a87 | 856 | return info->debug_base; |
13437d4b KB |
857 | } |
858 | ||
e4cd0d6a MK |
859 | /* Find the first element in the inferior's dynamic link map, and |
860 | return its address in the inferior. | |
13437d4b | 861 | |
e4cd0d6a MK |
862 | FIXME: Perhaps we should validate the info somehow, perhaps by |
863 | checking r_version for a known version number, or r_state for | |
864 | RT_CONSISTENT. */ | |
13437d4b KB |
865 | |
866 | static CORE_ADDR | |
1a816a87 | 867 | solib_svr4_r_map (struct svr4_info *info) |
13437d4b | 868 | { |
4b188b9f | 869 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 870 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
08597104 JB |
871 | CORE_ADDR addr = 0; |
872 | volatile struct gdb_exception ex; | |
13437d4b | 873 | |
08597104 JB |
874 | TRY_CATCH (ex, RETURN_MASK_ERROR) |
875 | { | |
876 | addr = read_memory_typed_address (info->debug_base + lmo->r_map_offset, | |
877 | ptr_type); | |
878 | } | |
879 | exception_print (gdb_stderr, ex); | |
880 | return addr; | |
e4cd0d6a | 881 | } |
13437d4b | 882 | |
7cd25cfc DJ |
883 | /* Find r_brk from the inferior's debug base. */ |
884 | ||
885 | static CORE_ADDR | |
1a816a87 | 886 | solib_svr4_r_brk (struct svr4_info *info) |
7cd25cfc DJ |
887 | { |
888 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 889 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
7cd25cfc | 890 | |
1a816a87 PA |
891 | return read_memory_typed_address (info->debug_base + lmo->r_brk_offset, |
892 | ptr_type); | |
7cd25cfc DJ |
893 | } |
894 | ||
e4cd0d6a MK |
895 | /* Find the link map for the dynamic linker (if it is not in the |
896 | normal list of loaded shared objects). */ | |
13437d4b | 897 | |
e4cd0d6a | 898 | static CORE_ADDR |
1a816a87 | 899 | solib_svr4_r_ldsomap (struct svr4_info *info) |
e4cd0d6a MK |
900 | { |
901 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 902 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
e17a4113 | 903 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
e4cd0d6a | 904 | ULONGEST version; |
13437d4b | 905 | |
e4cd0d6a MK |
906 | /* Check version, and return zero if `struct r_debug' doesn't have |
907 | the r_ldsomap member. */ | |
1a816a87 PA |
908 | version |
909 | = read_memory_unsigned_integer (info->debug_base + lmo->r_version_offset, | |
e17a4113 | 910 | lmo->r_version_size, byte_order); |
e4cd0d6a MK |
911 | if (version < 2 || lmo->r_ldsomap_offset == -1) |
912 | return 0; | |
13437d4b | 913 | |
1a816a87 | 914 | return read_memory_typed_address (info->debug_base + lmo->r_ldsomap_offset, |
b6da22b0 | 915 | ptr_type); |
13437d4b KB |
916 | } |
917 | ||
de18c1d8 JM |
918 | /* On Solaris systems with some versions of the dynamic linker, |
919 | ld.so's l_name pointer points to the SONAME in the string table | |
920 | rather than into writable memory. So that GDB can find shared | |
921 | libraries when loading a core file generated by gcore, ensure that | |
922 | memory areas containing the l_name string are saved in the core | |
923 | file. */ | |
924 | ||
925 | static int | |
926 | svr4_keep_data_in_core (CORE_ADDR vaddr, unsigned long size) | |
927 | { | |
928 | struct svr4_info *info; | |
929 | CORE_ADDR ldsomap; | |
930 | struct so_list *new; | |
931 | struct cleanup *old_chain; | |
932 | struct link_map_offsets *lmo; | |
933 | CORE_ADDR lm_name; | |
934 | ||
935 | info = get_svr4_info (); | |
936 | ||
937 | info->debug_base = 0; | |
938 | locate_base (info); | |
939 | if (!info->debug_base) | |
940 | return 0; | |
941 | ||
942 | ldsomap = solib_svr4_r_ldsomap (info); | |
943 | if (!ldsomap) | |
944 | return 0; | |
945 | ||
946 | lmo = svr4_fetch_link_map_offsets (); | |
947 | new = XZALLOC (struct so_list); | |
948 | old_chain = make_cleanup (xfree, new); | |
949 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
950 | make_cleanup (xfree, new->lm_info); | |
951 | new->lm_info->l_addr = (CORE_ADDR)-1; | |
952 | new->lm_info->lm_addr = ldsomap; | |
953 | new->lm_info->lm = xzalloc (lmo->link_map_size); | |
954 | make_cleanup (xfree, new->lm_info->lm); | |
955 | read_memory (ldsomap, new->lm_info->lm, lmo->link_map_size); | |
956 | lm_name = LM_NAME (new); | |
957 | do_cleanups (old_chain); | |
958 | ||
959 | return (lm_name >= vaddr && lm_name < vaddr + size); | |
960 | } | |
961 | ||
13437d4b KB |
962 | /* |
963 | ||
964 | LOCAL FUNCTION | |
965 | ||
966 | open_symbol_file_object | |
967 | ||
968 | SYNOPSIS | |
969 | ||
970 | void open_symbol_file_object (void *from_tty) | |
971 | ||
972 | DESCRIPTION | |
973 | ||
974 | If no open symbol file, attempt to locate and open the main symbol | |
975 | file. On SVR4 systems, this is the first link map entry. If its | |
976 | name is here, we can open it. Useful when attaching to a process | |
977 | without first loading its symbol file. | |
978 | ||
979 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |
980 | be printed. This parameter is a pointer rather than an int because | |
981 | open_symbol_file_object() is called via catch_errors() and | |
982 | catch_errors() requires a pointer argument. */ | |
983 | ||
984 | static int | |
985 | open_symbol_file_object (void *from_ttyp) | |
986 | { | |
987 | CORE_ADDR lm, l_name; | |
988 | char *filename; | |
989 | int errcode; | |
990 | int from_tty = *(int *)from_ttyp; | |
4b188b9f | 991 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 UW |
992 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
993 | int l_name_size = TYPE_LENGTH (ptr_type); | |
cfaefc65 | 994 | gdb_byte *l_name_buf = xmalloc (l_name_size); |
b8c9b27d | 995 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); |
6c95b8df | 996 | struct svr4_info *info = get_svr4_info (); |
13437d4b KB |
997 | |
998 | if (symfile_objfile) | |
9e2f0ad4 | 999 | if (!query (_("Attempt to reload symbols from process? "))) |
13437d4b KB |
1000 | return 0; |
1001 | ||
7cd25cfc | 1002 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
1003 | info->debug_base = 0; |
1004 | if (locate_base (info) == 0) | |
13437d4b KB |
1005 | return 0; /* failed somehow... */ |
1006 | ||
1007 | /* First link map member should be the executable. */ | |
1a816a87 | 1008 | lm = solib_svr4_r_map (info); |
e4cd0d6a | 1009 | if (lm == 0) |
13437d4b KB |
1010 | return 0; /* failed somehow... */ |
1011 | ||
1012 | /* Read address of name from target memory to GDB. */ | |
cfaefc65 | 1013 | read_memory (lm + lmo->l_name_offset, l_name_buf, l_name_size); |
13437d4b | 1014 | |
cfaefc65 | 1015 | /* Convert the address to host format. */ |
b6da22b0 | 1016 | l_name = extract_typed_address (l_name_buf, ptr_type); |
13437d4b KB |
1017 | |
1018 | /* Free l_name_buf. */ | |
1019 | do_cleanups (cleanups); | |
1020 | ||
1021 | if (l_name == 0) | |
1022 | return 0; /* No filename. */ | |
1023 | ||
1024 | /* Now fetch the filename from target memory. */ | |
1025 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
ea5bf0a1 | 1026 | make_cleanup (xfree, filename); |
13437d4b KB |
1027 | |
1028 | if (errcode) | |
1029 | { | |
8a3fe4f8 | 1030 | warning (_("failed to read exec filename from attached file: %s"), |
13437d4b KB |
1031 | safe_strerror (errcode)); |
1032 | return 0; | |
1033 | } | |
1034 | ||
13437d4b | 1035 | /* Have a pathname: read the symbol file. */ |
1adeb98a | 1036 | symbol_file_add_main (filename, from_tty); |
13437d4b KB |
1037 | |
1038 | return 1; | |
1039 | } | |
13437d4b | 1040 | |
34439770 DJ |
1041 | /* If no shared library information is available from the dynamic |
1042 | linker, build a fallback list from other sources. */ | |
1043 | ||
1044 | static struct so_list * | |
1045 | svr4_default_sos (void) | |
1046 | { | |
6c95b8df | 1047 | struct svr4_info *info = get_svr4_info (); |
1a816a87 | 1048 | |
34439770 DJ |
1049 | struct so_list *head = NULL; |
1050 | struct so_list **link_ptr = &head; | |
1051 | ||
1a816a87 | 1052 | if (info->debug_loader_offset_p) |
34439770 DJ |
1053 | { |
1054 | struct so_list *new = XZALLOC (struct so_list); | |
1055 | ||
1056 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
1057 | ||
1058 | /* Nothing will ever check the cached copy of the link | |
1059 | map if we set l_addr. */ | |
1a816a87 | 1060 | new->lm_info->l_addr = info->debug_loader_offset; |
93a57060 | 1061 | new->lm_info->lm_addr = 0; |
34439770 DJ |
1062 | new->lm_info->lm = NULL; |
1063 | ||
1a816a87 PA |
1064 | strncpy (new->so_name, info->debug_loader_name, |
1065 | SO_NAME_MAX_PATH_SIZE - 1); | |
34439770 DJ |
1066 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
1067 | strcpy (new->so_original_name, new->so_name); | |
1068 | ||
1069 | *link_ptr = new; | |
1070 | link_ptr = &new->next; | |
1071 | } | |
1072 | ||
1073 | return head; | |
1074 | } | |
1075 | ||
13437d4b KB |
1076 | /* LOCAL FUNCTION |
1077 | ||
1078 | current_sos -- build a list of currently loaded shared objects | |
1079 | ||
1080 | SYNOPSIS | |
1081 | ||
1082 | struct so_list *current_sos () | |
1083 | ||
1084 | DESCRIPTION | |
1085 | ||
1086 | Build a list of `struct so_list' objects describing the shared | |
1087 | objects currently loaded in the inferior. This list does not | |
1088 | include an entry for the main executable file. | |
1089 | ||
1090 | Note that we only gather information directly available from the | |
1091 | inferior --- we don't examine any of the shared library files | |
1092 | themselves. The declaration of `struct so_list' says which fields | |
1093 | we provide values for. */ | |
1094 | ||
1095 | static struct so_list * | |
1096 | svr4_current_sos (void) | |
1097 | { | |
1098 | CORE_ADDR lm; | |
1099 | struct so_list *head = 0; | |
1100 | struct so_list **link_ptr = &head; | |
e4cd0d6a | 1101 | CORE_ADDR ldsomap = 0; |
1a816a87 PA |
1102 | struct svr4_info *info; |
1103 | ||
6c95b8df | 1104 | info = get_svr4_info (); |
13437d4b | 1105 | |
7cd25cfc | 1106 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
1107 | info->debug_base = 0; |
1108 | locate_base (info); | |
13437d4b | 1109 | |
7cd25cfc DJ |
1110 | /* If we can't find the dynamic linker's base structure, this |
1111 | must not be a dynamically linked executable. Hmm. */ | |
1a816a87 | 1112 | if (! info->debug_base) |
7cd25cfc | 1113 | return svr4_default_sos (); |
13437d4b KB |
1114 | |
1115 | /* Walk the inferior's link map list, and build our list of | |
1116 | `struct so_list' nodes. */ | |
1a816a87 | 1117 | lm = solib_svr4_r_map (info); |
34439770 | 1118 | |
13437d4b KB |
1119 | while (lm) |
1120 | { | |
4b188b9f | 1121 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f4456994 | 1122 | struct so_list *new = XZALLOC (struct so_list); |
b8c9b27d | 1123 | struct cleanup *old_chain = make_cleanup (xfree, new); |
13437d4b | 1124 | |
13437d4b | 1125 | new->lm_info = xmalloc (sizeof (struct lm_info)); |
b8c9b27d | 1126 | make_cleanup (xfree, new->lm_info); |
13437d4b | 1127 | |
831004b7 | 1128 | new->lm_info->l_addr = (CORE_ADDR)-1; |
93a57060 | 1129 | new->lm_info->lm_addr = lm; |
f4456994 | 1130 | new->lm_info->lm = xzalloc (lmo->link_map_size); |
b8c9b27d | 1131 | make_cleanup (xfree, new->lm_info->lm); |
13437d4b KB |
1132 | |
1133 | read_memory (lm, new->lm_info->lm, lmo->link_map_size); | |
1134 | ||
1135 | lm = LM_NEXT (new); | |
1136 | ||
1137 | /* For SVR4 versions, the first entry in the link map is for the | |
1138 | inferior executable, so we must ignore it. For some versions of | |
1139 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1140 | does have a name, so we can no longer use a missing name to | |
1141 | decide when to ignore it. */ | |
e4cd0d6a | 1142 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new) && ldsomap == 0) |
93a57060 | 1143 | { |
1a816a87 | 1144 | info->main_lm_addr = new->lm_info->lm_addr; |
93a57060 DJ |
1145 | free_so (new); |
1146 | } | |
13437d4b KB |
1147 | else |
1148 | { | |
1149 | int errcode; | |
1150 | char *buffer; | |
1151 | ||
1152 | /* Extract this shared object's name. */ | |
1153 | target_read_string (LM_NAME (new), &buffer, | |
1154 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
1155 | if (errcode != 0) | |
8a3fe4f8 AC |
1156 | warning (_("Can't read pathname for load map: %s."), |
1157 | safe_strerror (errcode)); | |
13437d4b KB |
1158 | else |
1159 | { | |
1160 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); | |
1161 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
13437d4b KB |
1162 | strcpy (new->so_original_name, new->so_name); |
1163 | } | |
ea5bf0a1 | 1164 | xfree (buffer); |
13437d4b KB |
1165 | |
1166 | /* If this entry has no name, or its name matches the name | |
1167 | for the main executable, don't include it in the list. */ | |
1168 | if (! new->so_name[0] | |
1169 | || match_main (new->so_name)) | |
1170 | free_so (new); | |
1171 | else | |
1172 | { | |
1173 | new->next = 0; | |
1174 | *link_ptr = new; | |
1175 | link_ptr = &new->next; | |
1176 | } | |
1177 | } | |
1178 | ||
e4cd0d6a MK |
1179 | /* On Solaris, the dynamic linker is not in the normal list of |
1180 | shared objects, so make sure we pick it up too. Having | |
1181 | symbol information for the dynamic linker is quite crucial | |
1182 | for skipping dynamic linker resolver code. */ | |
1183 | if (lm == 0 && ldsomap == 0) | |
1a816a87 | 1184 | lm = ldsomap = solib_svr4_r_ldsomap (info); |
e4cd0d6a | 1185 | |
13437d4b KB |
1186 | discard_cleanups (old_chain); |
1187 | } | |
1188 | ||
34439770 DJ |
1189 | if (head == NULL) |
1190 | return svr4_default_sos (); | |
1191 | ||
13437d4b KB |
1192 | return head; |
1193 | } | |
1194 | ||
93a57060 | 1195 | /* Get the address of the link_map for a given OBJFILE. */ |
bc4a16ae EZ |
1196 | |
1197 | CORE_ADDR | |
1198 | svr4_fetch_objfile_link_map (struct objfile *objfile) | |
1199 | { | |
93a57060 | 1200 | struct so_list *so; |
6c95b8df | 1201 | struct svr4_info *info = get_svr4_info (); |
bc4a16ae | 1202 | |
93a57060 | 1203 | /* Cause svr4_current_sos() to be run if it hasn't been already. */ |
1a816a87 | 1204 | if (info->main_lm_addr == 0) |
93a57060 | 1205 | solib_add (NULL, 0, ¤t_target, auto_solib_add); |
bc4a16ae | 1206 | |
93a57060 DJ |
1207 | /* svr4_current_sos() will set main_lm_addr for the main executable. */ |
1208 | if (objfile == symfile_objfile) | |
1a816a87 | 1209 | return info->main_lm_addr; |
93a57060 DJ |
1210 | |
1211 | /* The other link map addresses may be found by examining the list | |
1212 | of shared libraries. */ | |
1213 | for (so = master_so_list (); so; so = so->next) | |
1214 | if (so->objfile == objfile) | |
1215 | return so->lm_info->lm_addr; | |
1216 | ||
1217 | /* Not found! */ | |
bc4a16ae EZ |
1218 | return 0; |
1219 | } | |
13437d4b KB |
1220 | |
1221 | /* On some systems, the only way to recognize the link map entry for | |
1222 | the main executable file is by looking at its name. Return | |
1223 | non-zero iff SONAME matches one of the known main executable names. */ | |
1224 | ||
1225 | static int | |
1226 | match_main (char *soname) | |
1227 | { | |
1228 | char **mainp; | |
1229 | ||
1230 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
1231 | { | |
1232 | if (strcmp (soname, *mainp) == 0) | |
1233 | return (1); | |
1234 | } | |
1235 | ||
1236 | return (0); | |
1237 | } | |
1238 | ||
13437d4b KB |
1239 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
1240 | SVR4 run time loader. */ | |
13437d4b | 1241 | |
7d522c90 | 1242 | int |
d7fa2ae2 | 1243 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) |
13437d4b | 1244 | { |
6c95b8df PA |
1245 | struct svr4_info *info = get_svr4_info (); |
1246 | ||
1247 | return ((pc >= info->interp_text_sect_low | |
1248 | && pc < info->interp_text_sect_high) | |
1249 | || (pc >= info->interp_plt_sect_low | |
1250 | && pc < info->interp_plt_sect_high) | |
13437d4b KB |
1251 | || in_plt_section (pc, NULL)); |
1252 | } | |
13437d4b | 1253 | |
2f4950cd AC |
1254 | /* Given an executable's ABFD and target, compute the entry-point |
1255 | address. */ | |
1256 | ||
1257 | static CORE_ADDR | |
1258 | exec_entry_point (struct bfd *abfd, struct target_ops *targ) | |
1259 | { | |
1260 | /* KevinB wrote ... for most targets, the address returned by | |
1261 | bfd_get_start_address() is the entry point for the start | |
1262 | function. But, for some targets, bfd_get_start_address() returns | |
1263 | the address of a function descriptor from which the entry point | |
1264 | address may be extracted. This address is extracted by | |
1265 | gdbarch_convert_from_func_ptr_addr(). The method | |
1266 | gdbarch_convert_from_func_ptr_addr() is the merely the identify | |
1267 | function for targets which don't use function descriptors. */ | |
1cf3db46 | 1268 | return gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
2f4950cd AC |
1269 | bfd_get_start_address (abfd), |
1270 | targ); | |
1271 | } | |
13437d4b KB |
1272 | |
1273 | /* | |
1274 | ||
1275 | LOCAL FUNCTION | |
1276 | ||
1277 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1278 | ||
1279 | SYNOPSIS | |
1280 | ||
1281 | int enable_break (void) | |
1282 | ||
1283 | DESCRIPTION | |
1284 | ||
1285 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1286 | debugger interface, support for arranging for the inferior to hit | |
1287 | a breakpoint after mapping in the shared libraries. This function | |
1288 | enables that breakpoint. | |
1289 | ||
1290 | For SunOS, there is a special flag location (in_debugger) which we | |
1291 | set to 1. When the dynamic linker sees this flag set, it will set | |
1292 | a breakpoint at a location known only to itself, after saving the | |
1293 | original contents of that place and the breakpoint address itself, | |
1294 | in it's own internal structures. When we resume the inferior, it | |
1295 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1296 | We handle this (in a different place) by restoring the contents of | |
1297 | the breakpointed location (which is only known after it stops), | |
1298 | chasing around to locate the shared libraries that have been | |
1299 | loaded, then resuming. | |
1300 | ||
1301 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1302 | which is statically initialized at the time the shared library is | |
1303 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1304 | teed to be called once before mapping in a library, and again when | |
1305 | the mapping is complete. At the time we are examining this member, | |
1306 | it contains only the unrelocated offset of the function, so we have | |
1307 | to do our own relocation. Later, when the dynamic linker actually | |
1308 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1309 | ||
1310 | The debugger interface structure also contains an enumeration which | |
1311 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1312 | depending upon whether or not the library is being mapped or unmapped, | |
1313 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1314 | */ | |
1315 | ||
1316 | static int | |
268a4a75 | 1317 | enable_break (struct svr4_info *info, int from_tty) |
13437d4b | 1318 | { |
13437d4b KB |
1319 | struct minimal_symbol *msymbol; |
1320 | char **bkpt_namep; | |
1321 | asection *interp_sect; | |
97ec2c2f | 1322 | gdb_byte *interp_name; |
7cd25cfc | 1323 | CORE_ADDR sym_addr; |
13437d4b | 1324 | |
6c95b8df PA |
1325 | info->interp_text_sect_low = info->interp_text_sect_high = 0; |
1326 | info->interp_plt_sect_low = info->interp_plt_sect_high = 0; | |
13437d4b | 1327 | |
7cd25cfc DJ |
1328 | /* If we already have a shared library list in the target, and |
1329 | r_debug contains r_brk, set the breakpoint there - this should | |
1330 | mean r_brk has already been relocated. Assume the dynamic linker | |
1331 | is the object containing r_brk. */ | |
1332 | ||
268a4a75 | 1333 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
7cd25cfc | 1334 | sym_addr = 0; |
1a816a87 PA |
1335 | if (info->debug_base && solib_svr4_r_map (info) != 0) |
1336 | sym_addr = solib_svr4_r_brk (info); | |
7cd25cfc DJ |
1337 | |
1338 | if (sym_addr != 0) | |
1339 | { | |
1340 | struct obj_section *os; | |
1341 | ||
b36ec657 | 1342 | sym_addr = gdbarch_addr_bits_remove |
1cf3db46 | 1343 | (target_gdbarch, gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
b36ec657 DJ |
1344 | sym_addr, |
1345 | ¤t_target)); | |
1346 | ||
48379de6 DE |
1347 | /* On at least some versions of Solaris there's a dynamic relocation |
1348 | on _r_debug.r_brk and SYM_ADDR may not be relocated yet, e.g., if | |
1349 | we get control before the dynamic linker has self-relocated. | |
1350 | Check if SYM_ADDR is in a known section, if it is assume we can | |
1351 | trust its value. This is just a heuristic though, it could go away | |
1352 | or be replaced if it's getting in the way. | |
1353 | ||
1354 | On ARM we need to know whether the ISA of rtld_db_dlactivity (or | |
1355 | however it's spelled in your particular system) is ARM or Thumb. | |
1356 | That knowledge is encoded in the address, if it's Thumb the low bit | |
1357 | is 1. However, we've stripped that info above and it's not clear | |
1358 | what all the consequences are of passing a non-addr_bits_remove'd | |
1359 | address to create_solib_event_breakpoint. The call to | |
1360 | find_pc_section verifies we know about the address and have some | |
1361 | hope of computing the right kind of breakpoint to use (via | |
1362 | symbol info). It does mean that GDB needs to be pointed at a | |
1363 | non-stripped version of the dynamic linker in order to obtain | |
1364 | information it already knows about. Sigh. */ | |
1365 | ||
7cd25cfc DJ |
1366 | os = find_pc_section (sym_addr); |
1367 | if (os != NULL) | |
1368 | { | |
1369 | /* Record the relocated start and end address of the dynamic linker | |
1370 | text and plt section for svr4_in_dynsym_resolve_code. */ | |
1371 | bfd *tmp_bfd; | |
1372 | CORE_ADDR load_addr; | |
1373 | ||
1374 | tmp_bfd = os->objfile->obfd; | |
1375 | load_addr = ANOFFSET (os->objfile->section_offsets, | |
1376 | os->objfile->sect_index_text); | |
1377 | ||
1378 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
1379 | if (interp_sect) | |
1380 | { | |
6c95b8df | 1381 | info->interp_text_sect_low = |
7cd25cfc | 1382 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1383 | info->interp_text_sect_high = |
1384 | info->interp_text_sect_low | |
1385 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1386 | } |
1387 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1388 | if (interp_sect) | |
1389 | { | |
6c95b8df | 1390 | info->interp_plt_sect_low = |
7cd25cfc | 1391 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1392 | info->interp_plt_sect_high = |
1393 | info->interp_plt_sect_low | |
1394 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1395 | } |
1396 | ||
a6d9a66e | 1397 | create_solib_event_breakpoint (target_gdbarch, sym_addr); |
7cd25cfc DJ |
1398 | return 1; |
1399 | } | |
1400 | } | |
1401 | ||
97ec2c2f | 1402 | /* Find the program interpreter; if not found, warn the user and drop |
13437d4b | 1403 | into the old breakpoint at symbol code. */ |
97ec2c2f UW |
1404 | interp_name = find_program_interpreter (); |
1405 | if (interp_name) | |
13437d4b | 1406 | { |
8ad2fcde KB |
1407 | CORE_ADDR load_addr = 0; |
1408 | int load_addr_found = 0; | |
2ec9a4f8 | 1409 | int loader_found_in_list = 0; |
f8766ec1 | 1410 | struct so_list *so; |
e4f7b8c8 | 1411 | bfd *tmp_bfd = NULL; |
2f4950cd | 1412 | struct target_ops *tmp_bfd_target; |
f1838a98 | 1413 | volatile struct gdb_exception ex; |
13437d4b | 1414 | |
7cd25cfc | 1415 | sym_addr = 0; |
13437d4b KB |
1416 | |
1417 | /* Now we need to figure out where the dynamic linker was | |
1418 | loaded so that we can load its symbols and place a breakpoint | |
1419 | in the dynamic linker itself. | |
1420 | ||
1421 | This address is stored on the stack. However, I've been unable | |
1422 | to find any magic formula to find it for Solaris (appears to | |
1423 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1424 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 | 1425 | |
f1838a98 UW |
1426 | TRY_CATCH (ex, RETURN_MASK_ALL) |
1427 | { | |
97ec2c2f | 1428 | tmp_bfd = solib_bfd_open (interp_name); |
f1838a98 | 1429 | } |
13437d4b KB |
1430 | if (tmp_bfd == NULL) |
1431 | goto bkpt_at_symbol; | |
1432 | ||
2f4950cd AC |
1433 | /* Now convert the TMP_BFD into a target. That way target, as |
1434 | well as BFD operations can be used. Note that closing the | |
1435 | target will also close the underlying bfd. */ | |
1436 | tmp_bfd_target = target_bfd_reopen (tmp_bfd); | |
1437 | ||
f8766ec1 KB |
1438 | /* On a running target, we can get the dynamic linker's base |
1439 | address from the shared library table. */ | |
f8766ec1 KB |
1440 | so = master_so_list (); |
1441 | while (so) | |
8ad2fcde | 1442 | { |
97ec2c2f | 1443 | if (svr4_same_1 (interp_name, so->so_original_name)) |
8ad2fcde KB |
1444 | { |
1445 | load_addr_found = 1; | |
2ec9a4f8 | 1446 | loader_found_in_list = 1; |
cc10cae3 | 1447 | load_addr = LM_ADDR_CHECK (so, tmp_bfd); |
8ad2fcde KB |
1448 | break; |
1449 | } | |
f8766ec1 | 1450 | so = so->next; |
8ad2fcde KB |
1451 | } |
1452 | ||
8d4e36ba JB |
1453 | /* If we were not able to find the base address of the loader |
1454 | from our so_list, then try using the AT_BASE auxilliary entry. */ | |
1455 | if (!load_addr_found) | |
1456 | if (target_auxv_search (¤t_target, AT_BASE, &load_addr) > 0) | |
ad3a0e5b JK |
1457 | { |
1458 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
1459 | ||
1460 | /* Ensure LOAD_ADDR has proper sign in its possible upper bits so | |
1461 | that `+ load_addr' will overflow CORE_ADDR width not creating | |
1462 | invalid addresses like 0x101234567 for 32bit inferiors on 64bit | |
1463 | GDB. */ | |
1464 | ||
d182d057 | 1465 | if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT)) |
ad3a0e5b | 1466 | { |
d182d057 | 1467 | CORE_ADDR space_size = (CORE_ADDR) 1 << addr_bit; |
ad3a0e5b JK |
1468 | CORE_ADDR tmp_entry_point = exec_entry_point (tmp_bfd, |
1469 | tmp_bfd_target); | |
1470 | ||
1471 | gdb_assert (load_addr < space_size); | |
1472 | ||
1473 | /* TMP_ENTRY_POINT exceeding SPACE_SIZE would be for prelinked | |
1474 | 64bit ld.so with 32bit executable, it should not happen. */ | |
1475 | ||
1476 | if (tmp_entry_point < space_size | |
1477 | && tmp_entry_point + load_addr >= space_size) | |
1478 | load_addr -= space_size; | |
1479 | } | |
1480 | ||
1481 | load_addr_found = 1; | |
1482 | } | |
8d4e36ba | 1483 | |
8ad2fcde KB |
1484 | /* Otherwise we find the dynamic linker's base address by examining |
1485 | the current pc (which should point at the entry point for the | |
8d4e36ba JB |
1486 | dynamic linker) and subtracting the offset of the entry point. |
1487 | ||
1488 | This is more fragile than the previous approaches, but is a good | |
1489 | fallback method because it has actually been working well in | |
1490 | most cases. */ | |
8ad2fcde | 1491 | if (!load_addr_found) |
fb14de7b | 1492 | { |
c2250ad1 UW |
1493 | struct regcache *regcache |
1494 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch); | |
fb14de7b UW |
1495 | load_addr = (regcache_read_pc (regcache) |
1496 | - exec_entry_point (tmp_bfd, tmp_bfd_target)); | |
1497 | } | |
2ec9a4f8 DJ |
1498 | |
1499 | if (!loader_found_in_list) | |
34439770 | 1500 | { |
1a816a87 PA |
1501 | info->debug_loader_name = xstrdup (interp_name); |
1502 | info->debug_loader_offset_p = 1; | |
1503 | info->debug_loader_offset = load_addr; | |
268a4a75 | 1504 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
34439770 | 1505 | } |
13437d4b KB |
1506 | |
1507 | /* Record the relocated start and end address of the dynamic linker | |
d7fa2ae2 | 1508 | text and plt section for svr4_in_dynsym_resolve_code. */ |
13437d4b KB |
1509 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1510 | if (interp_sect) | |
1511 | { | |
6c95b8df | 1512 | info->interp_text_sect_low = |
13437d4b | 1513 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1514 | info->interp_text_sect_high = |
1515 | info->interp_text_sect_low | |
1516 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1517 | } |
1518 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1519 | if (interp_sect) | |
1520 | { | |
6c95b8df | 1521 | info->interp_plt_sect_low = |
13437d4b | 1522 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1523 | info->interp_plt_sect_high = |
1524 | info->interp_plt_sect_low | |
1525 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1526 | } |
1527 | ||
1528 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1529 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1530 | { | |
2bbe3cc1 | 1531 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); |
13437d4b KB |
1532 | if (sym_addr != 0) |
1533 | break; | |
1534 | } | |
1535 | ||
2bbe3cc1 DJ |
1536 | if (sym_addr != 0) |
1537 | /* Convert 'sym_addr' from a function pointer to an address. | |
1538 | Because we pass tmp_bfd_target instead of the current | |
1539 | target, this will always produce an unrelocated value. */ | |
1cf3db46 | 1540 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
2bbe3cc1 DJ |
1541 | sym_addr, |
1542 | tmp_bfd_target); | |
1543 | ||
2f4950cd AC |
1544 | /* We're done with both the temporary bfd and target. Remember, |
1545 | closing the target closes the underlying bfd. */ | |
1546 | target_close (tmp_bfd_target, 0); | |
13437d4b KB |
1547 | |
1548 | if (sym_addr != 0) | |
1549 | { | |
a6d9a66e | 1550 | create_solib_event_breakpoint (target_gdbarch, load_addr + sym_addr); |
97ec2c2f | 1551 | xfree (interp_name); |
13437d4b KB |
1552 | return 1; |
1553 | } | |
1554 | ||
1555 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1556 | linker. Warn and drop into the old code. */ | |
1557 | bkpt_at_symbol: | |
97ec2c2f | 1558 | xfree (interp_name); |
82d03102 PG |
1559 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
1560 | "GDB will be unable to debug shared library initializers\n" | |
1561 | "and track explicitly loaded dynamic code.")); | |
13437d4b | 1562 | } |
13437d4b | 1563 | |
e499d0f1 DJ |
1564 | /* Scan through the lists of symbols, trying to look up the symbol and |
1565 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1566 | ||
1567 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1568 | { | |
1569 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1570 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1571 | { | |
de64a9ac JM |
1572 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
1573 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, | |
1574 | sym_addr, | |
1575 | ¤t_target); | |
1576 | create_solib_event_breakpoint (target_gdbarch, sym_addr); | |
e499d0f1 DJ |
1577 | return 1; |
1578 | } | |
1579 | } | |
13437d4b | 1580 | |
13437d4b KB |
1581 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) |
1582 | { | |
1583 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1584 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1585 | { | |
de64a9ac JM |
1586 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
1587 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, | |
1588 | sym_addr, | |
1589 | ¤t_target); | |
1590 | create_solib_event_breakpoint (target_gdbarch, sym_addr); | |
13437d4b KB |
1591 | return 1; |
1592 | } | |
1593 | } | |
542c95c2 | 1594 | return 0; |
13437d4b KB |
1595 | } |
1596 | ||
1597 | /* | |
1598 | ||
1599 | LOCAL FUNCTION | |
1600 | ||
1601 | special_symbol_handling -- additional shared library symbol handling | |
1602 | ||
1603 | SYNOPSIS | |
1604 | ||
1605 | void special_symbol_handling () | |
1606 | ||
1607 | DESCRIPTION | |
1608 | ||
1609 | Once the symbols from a shared object have been loaded in the usual | |
1610 | way, we are called to do any system specific symbol handling that | |
1611 | is needed. | |
1612 | ||
ab31aa69 | 1613 | For SunOS4, this consisted of grunging around in the dynamic |
13437d4b KB |
1614 | linkers structures to find symbol definitions for "common" symbols |
1615 | and adding them to the minimal symbol table for the runtime common | |
1616 | objfile. | |
1617 | ||
ab31aa69 KB |
1618 | However, for SVR4, there's nothing to do. |
1619 | ||
13437d4b KB |
1620 | */ |
1621 | ||
1622 | static void | |
1623 | svr4_special_symbol_handling (void) | |
1624 | { | |
9f2982ff | 1625 | svr4_relocate_main_executable (); |
13437d4b KB |
1626 | } |
1627 | ||
b8040f19 JK |
1628 | /* Decide if the objfile needs to be relocated. As indicated above, |
1629 | we will only be here when execution is stopped at the beginning | |
1630 | of the program. Relocation is necessary if the address at which | |
1631 | we are presently stopped differs from the start address stored in | |
1632 | the executable AND there's no interpreter section. The condition | |
1633 | regarding the interpreter section is very important because if | |
1634 | there *is* an interpreter section, execution will begin there | |
1635 | instead. When there is an interpreter section, the start address | |
1636 | is (presumably) used by the interpreter at some point to start | |
1637 | execution of the program. | |
1638 | ||
1639 | If there is an interpreter, it is normal for it to be set to an | |
1640 | arbitrary address at the outset. The job of finding it is | |
1641 | handled in enable_break(). | |
1642 | ||
1643 | So, to summarize, relocations are necessary when there is no | |
1644 | interpreter section and the start address obtained from the | |
1645 | executable is different from the address at which GDB is | |
1646 | currently stopped. | |
e2a44558 | 1647 | |
b8040f19 JK |
1648 | [ The astute reader will note that we also test to make sure that |
1649 | the executable in question has the DYNAMIC flag set. It is my | |
1650 | opinion that this test is unnecessary (undesirable even). It | |
1651 | was added to avoid inadvertent relocation of an executable | |
1652 | whose e_type member in the ELF header is not ET_DYN. There may | |
1653 | be a time in the future when it is desirable to do relocations | |
1654 | on other types of files as well in which case this condition | |
1655 | should either be removed or modified to accomodate the new file | |
1656 | type. (E.g, an ET_EXEC executable which has been built to be | |
1657 | position-independent could safely be relocated by the OS if | |
1658 | desired. It is true that this violates the ABI, but the ABI | |
1659 | has been known to be bent from time to time.) - Kevin, Nov 2000. ] | |
1660 | */ | |
e2a44558 | 1661 | |
b8040f19 JK |
1662 | static CORE_ADDR |
1663 | svr4_static_exec_displacement (void) | |
e2a44558 KB |
1664 | { |
1665 | asection *interp_sect; | |
c2250ad1 UW |
1666 | struct regcache *regcache |
1667 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch); | |
fb14de7b | 1668 | CORE_ADDR pc = regcache_read_pc (regcache); |
e2a44558 | 1669 | |
e2a44558 KB |
1670 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); |
1671 | if (interp_sect == NULL | |
1672 | && (bfd_get_file_flags (exec_bfd) & DYNAMIC) != 0 | |
2f4950cd | 1673 | && (exec_entry_point (exec_bfd, &exec_ops) != pc)) |
b8040f19 JK |
1674 | return pc - exec_entry_point (exec_bfd, &exec_ops); |
1675 | ||
1676 | return 0; | |
1677 | } | |
1678 | ||
1679 | /* We relocate all of the sections by the same amount. This | |
1680 | behavior is mandated by recent editions of the System V ABI. | |
1681 | According to the System V Application Binary Interface, | |
1682 | Edition 4.1, page 5-5: | |
1683 | ||
1684 | ... Though the system chooses virtual addresses for | |
1685 | individual processes, it maintains the segments' relative | |
1686 | positions. Because position-independent code uses relative | |
1687 | addressesing between segments, the difference between | |
1688 | virtual addresses in memory must match the difference | |
1689 | between virtual addresses in the file. The difference | |
1690 | between the virtual address of any segment in memory and | |
1691 | the corresponding virtual address in the file is thus a | |
1692 | single constant value for any one executable or shared | |
1693 | object in a given process. This difference is the base | |
1694 | address. One use of the base address is to relocate the | |
1695 | memory image of the program during dynamic linking. | |
1696 | ||
1697 | The same language also appears in Edition 4.0 of the System V | |
1698 | ABI and is left unspecified in some of the earlier editions. */ | |
1699 | ||
1700 | static CORE_ADDR | |
1701 | svr4_exec_displacement (void) | |
1702 | { | |
1703 | int found; | |
41752192 JK |
1704 | /* ENTRY_POINT is a possible function descriptor - before |
1705 | a call to gdbarch_convert_from_func_ptr_addr. */ | |
b8040f19 JK |
1706 | CORE_ADDR entry_point; |
1707 | ||
1708 | if (exec_bfd == NULL) | |
1709 | return 0; | |
1710 | ||
1711 | if (target_auxv_search (¤t_target, AT_ENTRY, &entry_point) == 1) | |
41752192 | 1712 | return entry_point - bfd_get_start_address (exec_bfd); |
b8040f19 JK |
1713 | |
1714 | return svr4_static_exec_displacement (); | |
1715 | } | |
1716 | ||
1717 | /* Relocate the main executable. This function should be called upon | |
1718 | stopping the inferior process at the entry point to the program. | |
1719 | The entry point from BFD is compared to the AT_ENTRY of AUXV and if they are | |
1720 | different, the main executable is relocated by the proper amount. */ | |
1721 | ||
1722 | static void | |
1723 | svr4_relocate_main_executable (void) | |
1724 | { | |
1725 | CORE_ADDR displacement = svr4_exec_displacement (); | |
1726 | ||
1727 | /* Even if DISPLACEMENT is 0 still try to relocate it as this is a new | |
1728 | difference of in-memory vs. in-file addresses and we could already | |
1729 | relocate the executable at this function to improper address before. */ | |
1730 | ||
1731 | if (symfile_objfile) | |
e2a44558 | 1732 | { |
e2a44558 | 1733 | struct section_offsets *new_offsets; |
b8040f19 | 1734 | int i; |
e2a44558 | 1735 | |
b8040f19 JK |
1736 | new_offsets = alloca (symfile_objfile->num_sections |
1737 | * sizeof (*new_offsets)); | |
e2a44558 | 1738 | |
b8040f19 JK |
1739 | for (i = 0; i < symfile_objfile->num_sections; i++) |
1740 | new_offsets->offsets[i] = displacement; | |
e2a44558 | 1741 | |
b8040f19 | 1742 | objfile_relocate (symfile_objfile, new_offsets); |
e2a44558 | 1743 | } |
51bee8e9 JK |
1744 | else if (exec_bfd) |
1745 | { | |
1746 | asection *asect; | |
1747 | ||
1748 | for (asect = exec_bfd->sections; asect != NULL; asect = asect->next) | |
1749 | exec_set_section_address (bfd_get_filename (exec_bfd), asect->index, | |
1750 | (bfd_section_vma (exec_bfd, asect) | |
1751 | + displacement)); | |
1752 | } | |
e2a44558 KB |
1753 | } |
1754 | ||
13437d4b KB |
1755 | /* |
1756 | ||
1757 | GLOBAL FUNCTION | |
1758 | ||
1759 | svr4_solib_create_inferior_hook -- shared library startup support | |
1760 | ||
1761 | SYNOPSIS | |
1762 | ||
268a4a75 | 1763 | void svr4_solib_create_inferior_hook (int from_tty) |
13437d4b KB |
1764 | |
1765 | DESCRIPTION | |
1766 | ||
1767 | When gdb starts up the inferior, it nurses it along (through the | |
1768 | shell) until it is ready to execute it's first instruction. At this | |
1769 | point, this function gets called via expansion of the macro | |
1770 | SOLIB_CREATE_INFERIOR_HOOK. | |
1771 | ||
1772 | For SunOS executables, this first instruction is typically the | |
1773 | one at "_start", or a similar text label, regardless of whether | |
1774 | the executable is statically or dynamically linked. The runtime | |
1775 | startup code takes care of dynamically linking in any shared | |
1776 | libraries, once gdb allows the inferior to continue. | |
1777 | ||
1778 | For SVR4 executables, this first instruction is either the first | |
1779 | instruction in the dynamic linker (for dynamically linked | |
1780 | executables) or the instruction at "start" for statically linked | |
1781 | executables. For dynamically linked executables, the system | |
1782 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1783 | and starts it running. The dynamic linker maps in any needed | |
1784 | shared libraries, maps in the actual user executable, and then | |
1785 | jumps to "start" in the user executable. | |
1786 | ||
1787 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1788 | can arrange to cooperate with the dynamic linker to discover the | |
1789 | names of shared libraries that are dynamically linked, and the | |
1790 | base addresses to which they are linked. | |
1791 | ||
1792 | This function is responsible for discovering those names and | |
1793 | addresses, and saving sufficient information about them to allow | |
1794 | their symbols to be read at a later time. | |
1795 | ||
1796 | FIXME | |
1797 | ||
1798 | Between enable_break() and disable_break(), this code does not | |
1799 | properly handle hitting breakpoints which the user might have | |
1800 | set in the startup code or in the dynamic linker itself. Proper | |
1801 | handling will probably have to wait until the implementation is | |
1802 | changed to use the "breakpoint handler function" method. | |
1803 | ||
1804 | Also, what if child has exit()ed? Must exit loop somehow. | |
1805 | */ | |
1806 | ||
e2a44558 | 1807 | static void |
268a4a75 | 1808 | svr4_solib_create_inferior_hook (int from_tty) |
13437d4b | 1809 | { |
d6b48e9c | 1810 | struct inferior *inf; |
2020b7ab | 1811 | struct thread_info *tp; |
1a816a87 PA |
1812 | struct svr4_info *info; |
1813 | ||
6c95b8df | 1814 | info = get_svr4_info (); |
2020b7ab | 1815 | |
e2a44558 | 1816 | /* Relocate the main executable if necessary. */ |
9f2982ff JK |
1817 | if (current_inferior ()->attach_flag == 0) |
1818 | svr4_relocate_main_executable (); | |
e2a44558 | 1819 | |
d5a921c9 | 1820 | if (!svr4_have_link_map_offsets ()) |
513f5903 | 1821 | return; |
d5a921c9 | 1822 | |
268a4a75 | 1823 | if (!enable_break (info, from_tty)) |
542c95c2 | 1824 | return; |
13437d4b | 1825 | |
ab31aa69 KB |
1826 | #if defined(_SCO_DS) |
1827 | /* SCO needs the loop below, other systems should be using the | |
13437d4b KB |
1828 | special shared library breakpoints and the shared library breakpoint |
1829 | service routine. | |
1830 | ||
1831 | Now run the target. It will eventually hit the breakpoint, at | |
1832 | which point all of the libraries will have been mapped in and we | |
1833 | can go groveling around in the dynamic linker structures to find | |
1834 | out what we need to know about them. */ | |
1835 | ||
d6b48e9c | 1836 | inf = current_inferior (); |
2020b7ab PA |
1837 | tp = inferior_thread (); |
1838 | ||
13437d4b | 1839 | clear_proceed_status (); |
d6b48e9c | 1840 | inf->stop_soon = STOP_QUIETLY; |
2020b7ab | 1841 | tp->stop_signal = TARGET_SIGNAL_0; |
13437d4b KB |
1842 | do |
1843 | { | |
2020b7ab | 1844 | target_resume (pid_to_ptid (-1), 0, tp->stop_signal); |
ae123ec6 | 1845 | wait_for_inferior (0); |
13437d4b | 1846 | } |
2020b7ab | 1847 | while (tp->stop_signal != TARGET_SIGNAL_TRAP); |
d6b48e9c | 1848 | inf->stop_soon = NO_STOP_QUIETLY; |
ab31aa69 | 1849 | #endif /* defined(_SCO_DS) */ |
13437d4b KB |
1850 | } |
1851 | ||
1852 | static void | |
1853 | svr4_clear_solib (void) | |
1854 | { | |
6c95b8df PA |
1855 | struct svr4_info *info; |
1856 | ||
1857 | info = get_svr4_info (); | |
1858 | info->debug_base = 0; | |
1859 | info->debug_loader_offset_p = 0; | |
1860 | info->debug_loader_offset = 0; | |
1861 | xfree (info->debug_loader_name); | |
1862 | info->debug_loader_name = NULL; | |
13437d4b KB |
1863 | } |
1864 | ||
1865 | static void | |
1866 | svr4_free_so (struct so_list *so) | |
1867 | { | |
b8c9b27d KB |
1868 | xfree (so->lm_info->lm); |
1869 | xfree (so->lm_info); | |
13437d4b KB |
1870 | } |
1871 | ||
6bb7be43 JB |
1872 | |
1873 | /* Clear any bits of ADDR that wouldn't fit in a target-format | |
1874 | data pointer. "Data pointer" here refers to whatever sort of | |
1875 | address the dynamic linker uses to manage its sections. At the | |
1876 | moment, we don't support shared libraries on any processors where | |
1877 | code and data pointers are different sizes. | |
1878 | ||
1879 | This isn't really the right solution. What we really need here is | |
1880 | a way to do arithmetic on CORE_ADDR values that respects the | |
1881 | natural pointer/address correspondence. (For example, on the MIPS, | |
1882 | converting a 32-bit pointer to a 64-bit CORE_ADDR requires you to | |
1883 | sign-extend the value. There, simply truncating the bits above | |
819844ad | 1884 | gdbarch_ptr_bit, as we do below, is no good.) This should probably |
6bb7be43 JB |
1885 | be a new gdbarch method or something. */ |
1886 | static CORE_ADDR | |
1887 | svr4_truncate_ptr (CORE_ADDR addr) | |
1888 | { | |
1cf3db46 | 1889 | if (gdbarch_ptr_bit (target_gdbarch) == sizeof (CORE_ADDR) * 8) |
6bb7be43 JB |
1890 | /* We don't need to truncate anything, and the bit twiddling below |
1891 | will fail due to overflow problems. */ | |
1892 | return addr; | |
1893 | else | |
1cf3db46 | 1894 | return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch)) - 1); |
6bb7be43 JB |
1895 | } |
1896 | ||
1897 | ||
749499cb KB |
1898 | static void |
1899 | svr4_relocate_section_addresses (struct so_list *so, | |
0542c86d | 1900 | struct target_section *sec) |
749499cb | 1901 | { |
cc10cae3 AO |
1902 | sec->addr = svr4_truncate_ptr (sec->addr + LM_ADDR_CHECK (so, |
1903 | sec->bfd)); | |
1904 | sec->endaddr = svr4_truncate_ptr (sec->endaddr + LM_ADDR_CHECK (so, | |
1905 | sec->bfd)); | |
749499cb | 1906 | } |
4b188b9f | 1907 | \f |
749499cb | 1908 | |
4b188b9f | 1909 | /* Architecture-specific operations. */ |
6bb7be43 | 1910 | |
4b188b9f MK |
1911 | /* Per-architecture data key. */ |
1912 | static struct gdbarch_data *solib_svr4_data; | |
e5e2b9ff | 1913 | |
4b188b9f | 1914 | struct solib_svr4_ops |
e5e2b9ff | 1915 | { |
4b188b9f MK |
1916 | /* Return a description of the layout of `struct link_map'. */ |
1917 | struct link_map_offsets *(*fetch_link_map_offsets)(void); | |
1918 | }; | |
e5e2b9ff | 1919 | |
4b188b9f | 1920 | /* Return a default for the architecture-specific operations. */ |
e5e2b9ff | 1921 | |
4b188b9f MK |
1922 | static void * |
1923 | solib_svr4_init (struct obstack *obstack) | |
e5e2b9ff | 1924 | { |
4b188b9f | 1925 | struct solib_svr4_ops *ops; |
e5e2b9ff | 1926 | |
4b188b9f | 1927 | ops = OBSTACK_ZALLOC (obstack, struct solib_svr4_ops); |
8d005789 | 1928 | ops->fetch_link_map_offsets = NULL; |
4b188b9f | 1929 | return ops; |
e5e2b9ff KB |
1930 | } |
1931 | ||
4b188b9f | 1932 | /* Set the architecture-specific `struct link_map_offsets' fetcher for |
7e3cb44c | 1933 | GDBARCH to FLMO. Also, install SVR4 solib_ops into GDBARCH. */ |
1c4dcb57 | 1934 | |
21479ded | 1935 | void |
e5e2b9ff KB |
1936 | set_solib_svr4_fetch_link_map_offsets (struct gdbarch *gdbarch, |
1937 | struct link_map_offsets *(*flmo) (void)) | |
21479ded | 1938 | { |
4b188b9f MK |
1939 | struct solib_svr4_ops *ops = gdbarch_data (gdbarch, solib_svr4_data); |
1940 | ||
1941 | ops->fetch_link_map_offsets = flmo; | |
7e3cb44c UW |
1942 | |
1943 | set_solib_ops (gdbarch, &svr4_so_ops); | |
21479ded KB |
1944 | } |
1945 | ||
4b188b9f MK |
1946 | /* Fetch a link_map_offsets structure using the architecture-specific |
1947 | `struct link_map_offsets' fetcher. */ | |
1c4dcb57 | 1948 | |
4b188b9f MK |
1949 | static struct link_map_offsets * |
1950 | svr4_fetch_link_map_offsets (void) | |
21479ded | 1951 | { |
1cf3db46 | 1952 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data); |
4b188b9f MK |
1953 | |
1954 | gdb_assert (ops->fetch_link_map_offsets); | |
1955 | return ops->fetch_link_map_offsets (); | |
21479ded KB |
1956 | } |
1957 | ||
4b188b9f MK |
1958 | /* Return 1 if a link map offset fetcher has been defined, 0 otherwise. */ |
1959 | ||
1960 | static int | |
1961 | svr4_have_link_map_offsets (void) | |
1962 | { | |
1cf3db46 | 1963 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data); |
4b188b9f MK |
1964 | return (ops->fetch_link_map_offsets != NULL); |
1965 | } | |
1966 | \f | |
1967 | ||
e4bbbda8 MK |
1968 | /* Most OS'es that have SVR4-style ELF dynamic libraries define a |
1969 | `struct r_debug' and a `struct link_map' that are binary compatible | |
1970 | with the origional SVR4 implementation. */ | |
1971 | ||
1972 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
1973 | for an ILP32 SVR4 system. */ | |
1974 | ||
1975 | struct link_map_offsets * | |
1976 | svr4_ilp32_fetch_link_map_offsets (void) | |
1977 | { | |
1978 | static struct link_map_offsets lmo; | |
1979 | static struct link_map_offsets *lmp = NULL; | |
1980 | ||
1981 | if (lmp == NULL) | |
1982 | { | |
1983 | lmp = &lmo; | |
1984 | ||
e4cd0d6a MK |
1985 | lmo.r_version_offset = 0; |
1986 | lmo.r_version_size = 4; | |
e4bbbda8 | 1987 | lmo.r_map_offset = 4; |
7cd25cfc | 1988 | lmo.r_brk_offset = 8; |
e4cd0d6a | 1989 | lmo.r_ldsomap_offset = 20; |
e4bbbda8 MK |
1990 | |
1991 | /* Everything we need is in the first 20 bytes. */ | |
1992 | lmo.link_map_size = 20; | |
1993 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 1994 | lmo.l_name_offset = 4; |
cc10cae3 | 1995 | lmo.l_ld_offset = 8; |
e4bbbda8 | 1996 | lmo.l_next_offset = 12; |
e4bbbda8 | 1997 | lmo.l_prev_offset = 16; |
e4bbbda8 MK |
1998 | } |
1999 | ||
2000 | return lmp; | |
2001 | } | |
2002 | ||
2003 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
2004 | for an LP64 SVR4 system. */ | |
2005 | ||
2006 | struct link_map_offsets * | |
2007 | svr4_lp64_fetch_link_map_offsets (void) | |
2008 | { | |
2009 | static struct link_map_offsets lmo; | |
2010 | static struct link_map_offsets *lmp = NULL; | |
2011 | ||
2012 | if (lmp == NULL) | |
2013 | { | |
2014 | lmp = &lmo; | |
2015 | ||
e4cd0d6a MK |
2016 | lmo.r_version_offset = 0; |
2017 | lmo.r_version_size = 4; | |
e4bbbda8 | 2018 | lmo.r_map_offset = 8; |
7cd25cfc | 2019 | lmo.r_brk_offset = 16; |
e4cd0d6a | 2020 | lmo.r_ldsomap_offset = 40; |
e4bbbda8 MK |
2021 | |
2022 | /* Everything we need is in the first 40 bytes. */ | |
2023 | lmo.link_map_size = 40; | |
2024 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 2025 | lmo.l_name_offset = 8; |
cc10cae3 | 2026 | lmo.l_ld_offset = 16; |
e4bbbda8 | 2027 | lmo.l_next_offset = 24; |
e4bbbda8 | 2028 | lmo.l_prev_offset = 32; |
e4bbbda8 MK |
2029 | } |
2030 | ||
2031 | return lmp; | |
2032 | } | |
2033 | \f | |
2034 | ||
7d522c90 | 2035 | struct target_so_ops svr4_so_ops; |
13437d4b | 2036 | |
3a40aaa0 UW |
2037 | /* Lookup global symbol for ELF DSOs linked with -Bsymbolic. Those DSOs have a |
2038 | different rule for symbol lookup. The lookup begins here in the DSO, not in | |
2039 | the main executable. */ | |
2040 | ||
2041 | static struct symbol * | |
2042 | elf_lookup_lib_symbol (const struct objfile *objfile, | |
2043 | const char *name, | |
2044 | const char *linkage_name, | |
21b556f4 | 2045 | const domain_enum domain) |
3a40aaa0 | 2046 | { |
61f0d762 JK |
2047 | bfd *abfd; |
2048 | ||
2049 | if (objfile == symfile_objfile) | |
2050 | abfd = exec_bfd; | |
2051 | else | |
2052 | { | |
2053 | /* OBJFILE should have been passed as the non-debug one. */ | |
2054 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
2055 | ||
2056 | abfd = objfile->obfd; | |
2057 | } | |
2058 | ||
2059 | if (abfd == NULL || scan_dyntag (DT_SYMBOLIC, abfd, NULL) != 1) | |
3a40aaa0 UW |
2060 | return NULL; |
2061 | ||
65728c26 | 2062 | return lookup_global_symbol_from_objfile |
21b556f4 | 2063 | (objfile, name, linkage_name, domain); |
3a40aaa0 UW |
2064 | } |
2065 | ||
a78f21af AC |
2066 | extern initialize_file_ftype _initialize_svr4_solib; /* -Wmissing-prototypes */ |
2067 | ||
13437d4b KB |
2068 | void |
2069 | _initialize_svr4_solib (void) | |
2070 | { | |
4b188b9f | 2071 | solib_svr4_data = gdbarch_data_register_pre_init (solib_svr4_init); |
6c95b8df PA |
2072 | solib_svr4_pspace_data |
2073 | = register_program_space_data_with_cleanup (svr4_pspace_data_cleanup); | |
4b188b9f | 2074 | |
749499cb | 2075 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b KB |
2076 | svr4_so_ops.free_so = svr4_free_so; |
2077 | svr4_so_ops.clear_solib = svr4_clear_solib; | |
2078 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
2079 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |
2080 | svr4_so_ops.current_sos = svr4_current_sos; | |
2081 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
d7fa2ae2 | 2082 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; |
831a0c44 | 2083 | svr4_so_ops.bfd_open = solib_bfd_open; |
3a40aaa0 | 2084 | svr4_so_ops.lookup_lib_global_symbol = elf_lookup_lib_symbol; |
a7c02bc8 | 2085 | svr4_so_ops.same = svr4_same; |
de18c1d8 | 2086 | svr4_so_ops.keep_data_in_core = svr4_keep_data_in_core; |
13437d4b | 2087 | } |