Commit | Line | Data |
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ab31aa69 | 1 | /* Handle SVR4 shared libraries for GDB, the GNU Debugger. |
2f4950cd | 2 | |
28e7fd62 | 3 | Copyright (C) 1990-2013 Free Software Foundation, Inc. |
13437d4b KB |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
13437d4b KB |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
13437d4b | 19 | |
13437d4b KB |
20 | #include "defs.h" |
21 | ||
13437d4b | 22 | #include "elf/external.h" |
21479ded | 23 | #include "elf/common.h" |
f7856c8f | 24 | #include "elf/mips.h" |
13437d4b KB |
25 | |
26 | #include "symtab.h" | |
27 | #include "bfd.h" | |
28 | #include "symfile.h" | |
29 | #include "objfiles.h" | |
30 | #include "gdbcore.h" | |
13437d4b | 31 | #include "target.h" |
13437d4b | 32 | #include "inferior.h" |
fb14de7b | 33 | #include "regcache.h" |
2020b7ab | 34 | #include "gdbthread.h" |
1a816a87 | 35 | #include "observer.h" |
13437d4b | 36 | |
4b188b9f MK |
37 | #include "gdb_assert.h" |
38 | ||
13437d4b | 39 | #include "solist.h" |
bba93f6c | 40 | #include "solib.h" |
13437d4b KB |
41 | #include "solib-svr4.h" |
42 | ||
2f4950cd | 43 | #include "bfd-target.h" |
cc10cae3 | 44 | #include "elf-bfd.h" |
2f4950cd | 45 | #include "exec.h" |
8d4e36ba | 46 | #include "auxv.h" |
f1838a98 | 47 | #include "exceptions.h" |
695c3173 | 48 | #include "gdb_bfd.h" |
f9e14852 | 49 | #include "probe.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); |
f9e14852 | 54 | static void svr4_free_library_list (void *p_list); |
1c4dcb57 | 55 | |
c378eb4e | 56 | /* Link map info to include in an allocated so_list entry. */ |
13437d4b KB |
57 | |
58 | struct lm_info | |
59 | { | |
cc10cae3 | 60 | /* Amount by which addresses in the binary should be relocated to |
3957565a JK |
61 | match the inferior. The direct inferior value is L_ADDR_INFERIOR. |
62 | When prelinking is involved and the prelink base address changes, | |
63 | we may need a different offset - the recomputed offset is in L_ADDR. | |
64 | It is commonly the same value. It is cached as we want to warn about | |
65 | the difference and compute it only once. L_ADDR is valid | |
66 | iff L_ADDR_P. */ | |
67 | CORE_ADDR l_addr, l_addr_inferior; | |
68 | unsigned int l_addr_p : 1; | |
93a57060 DJ |
69 | |
70 | /* The target location of lm. */ | |
71 | CORE_ADDR lm_addr; | |
3957565a JK |
72 | |
73 | /* Values read in from inferior's fields of the same name. */ | |
74 | CORE_ADDR l_ld, l_next, l_prev, l_name; | |
13437d4b KB |
75 | }; |
76 | ||
77 | /* On SVR4 systems, a list of symbols in the dynamic linker where | |
78 | GDB can try to place a breakpoint to monitor shared library | |
79 | events. | |
80 | ||
81 | If none of these symbols are found, or other errors occur, then | |
82 | SVR4 systems will fall back to using a symbol as the "startup | |
83 | mapping complete" breakpoint address. */ | |
84 | ||
bc043ef3 | 85 | static const char * const solib_break_names[] = |
13437d4b KB |
86 | { |
87 | "r_debug_state", | |
88 | "_r_debug_state", | |
89 | "_dl_debug_state", | |
90 | "rtld_db_dlactivity", | |
4c7dcb84 | 91 | "__dl_rtld_db_dlactivity", |
1f72e589 | 92 | "_rtld_debug_state", |
4c0122c8 | 93 | |
13437d4b KB |
94 | NULL |
95 | }; | |
13437d4b | 96 | |
bc043ef3 | 97 | static const char * const bkpt_names[] = |
13437d4b | 98 | { |
13437d4b | 99 | "_start", |
ad3dcc5c | 100 | "__start", |
13437d4b KB |
101 | "main", |
102 | NULL | |
103 | }; | |
13437d4b | 104 | |
bc043ef3 | 105 | static const char * const main_name_list[] = |
13437d4b KB |
106 | { |
107 | "main_$main", | |
108 | NULL | |
109 | }; | |
110 | ||
f9e14852 GB |
111 | /* What to do when a probe stop occurs. */ |
112 | ||
113 | enum probe_action | |
114 | { | |
115 | /* Something went seriously wrong. Stop using probes and | |
116 | revert to using the older interface. */ | |
117 | PROBES_INTERFACE_FAILED, | |
118 | ||
119 | /* No action is required. The shared object list is still | |
120 | valid. */ | |
121 | DO_NOTHING, | |
122 | ||
123 | /* The shared object list should be reloaded entirely. */ | |
124 | FULL_RELOAD, | |
125 | ||
126 | /* Attempt to incrementally update the shared object list. If | |
127 | the update fails or is not possible, fall back to reloading | |
128 | the list in full. */ | |
129 | UPDATE_OR_RELOAD, | |
130 | }; | |
131 | ||
132 | /* A probe's name and its associated action. */ | |
133 | ||
134 | struct probe_info | |
135 | { | |
136 | /* The name of the probe. */ | |
137 | const char *name; | |
138 | ||
139 | /* What to do when a probe stop occurs. */ | |
140 | enum probe_action action; | |
141 | }; | |
142 | ||
143 | /* A list of named probes and their associated actions. If all | |
144 | probes are present in the dynamic linker then the probes-based | |
145 | interface will be used. */ | |
146 | ||
147 | static const struct probe_info probe_info[] = | |
148 | { | |
149 | { "init_start", DO_NOTHING }, | |
150 | { "init_complete", FULL_RELOAD }, | |
151 | { "map_start", DO_NOTHING }, | |
152 | { "map_failed", DO_NOTHING }, | |
153 | { "reloc_complete", UPDATE_OR_RELOAD }, | |
154 | { "unmap_start", DO_NOTHING }, | |
155 | { "unmap_complete", FULL_RELOAD }, | |
156 | }; | |
157 | ||
158 | #define NUM_PROBES ARRAY_SIZE (probe_info) | |
159 | ||
4d7b2d5b JB |
160 | /* Return non-zero if GDB_SO_NAME and INFERIOR_SO_NAME represent |
161 | the same shared library. */ | |
162 | ||
163 | static int | |
164 | svr4_same_1 (const char *gdb_so_name, const char *inferior_so_name) | |
165 | { | |
166 | if (strcmp (gdb_so_name, inferior_so_name) == 0) | |
167 | return 1; | |
168 | ||
169 | /* On Solaris, when starting inferior we think that dynamic linker is | |
d989b283 PP |
170 | /usr/lib/ld.so.1, but later on, the table of loaded shared libraries |
171 | contains /lib/ld.so.1. Sometimes one file is a link to another, but | |
4d7b2d5b JB |
172 | sometimes they have identical content, but are not linked to each |
173 | other. We don't restrict this check for Solaris, but the chances | |
174 | of running into this situation elsewhere are very low. */ | |
175 | if (strcmp (gdb_so_name, "/usr/lib/ld.so.1") == 0 | |
176 | && strcmp (inferior_so_name, "/lib/ld.so.1") == 0) | |
177 | return 1; | |
178 | ||
179 | /* Similarly, we observed the same issue with sparc64, but with | |
180 | different locations. */ | |
181 | if (strcmp (gdb_so_name, "/usr/lib/sparcv9/ld.so.1") == 0 | |
182 | && strcmp (inferior_so_name, "/lib/sparcv9/ld.so.1") == 0) | |
183 | return 1; | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static int | |
189 | svr4_same (struct so_list *gdb, struct so_list *inferior) | |
190 | { | |
191 | return (svr4_same_1 (gdb->so_original_name, inferior->so_original_name)); | |
192 | } | |
193 | ||
3957565a JK |
194 | static struct lm_info * |
195 | lm_info_read (CORE_ADDR lm_addr) | |
13437d4b | 196 | { |
4b188b9f | 197 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
3957565a JK |
198 | gdb_byte *lm; |
199 | struct lm_info *lm_info; | |
200 | struct cleanup *back_to; | |
201 | ||
202 | lm = xmalloc (lmo->link_map_size); | |
203 | back_to = make_cleanup (xfree, lm); | |
204 | ||
205 | if (target_read_memory (lm_addr, lm, lmo->link_map_size) != 0) | |
206 | { | |
207 | warning (_("Error reading shared library list entry at %s"), | |
f5656ead | 208 | paddress (target_gdbarch (), lm_addr)), |
3957565a JK |
209 | lm_info = NULL; |
210 | } | |
211 | else | |
212 | { | |
f5656ead | 213 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
13437d4b | 214 | |
3957565a JK |
215 | lm_info = xzalloc (sizeof (*lm_info)); |
216 | lm_info->lm_addr = lm_addr; | |
217 | ||
218 | lm_info->l_addr_inferior = extract_typed_address (&lm[lmo->l_addr_offset], | |
219 | ptr_type); | |
220 | lm_info->l_ld = extract_typed_address (&lm[lmo->l_ld_offset], ptr_type); | |
221 | lm_info->l_next = extract_typed_address (&lm[lmo->l_next_offset], | |
222 | ptr_type); | |
223 | lm_info->l_prev = extract_typed_address (&lm[lmo->l_prev_offset], | |
224 | ptr_type); | |
225 | lm_info->l_name = extract_typed_address (&lm[lmo->l_name_offset], | |
226 | ptr_type); | |
227 | } | |
228 | ||
229 | do_cleanups (back_to); | |
230 | ||
231 | return lm_info; | |
13437d4b KB |
232 | } |
233 | ||
cc10cae3 | 234 | static int |
b23518f0 | 235 | has_lm_dynamic_from_link_map (void) |
cc10cae3 AO |
236 | { |
237 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
238 | ||
cfaefc65 | 239 | return lmo->l_ld_offset >= 0; |
cc10cae3 AO |
240 | } |
241 | ||
cc10cae3 | 242 | static CORE_ADDR |
f65ce5fb | 243 | lm_addr_check (const struct so_list *so, bfd *abfd) |
cc10cae3 | 244 | { |
3957565a | 245 | if (!so->lm_info->l_addr_p) |
cc10cae3 AO |
246 | { |
247 | struct bfd_section *dyninfo_sect; | |
28f34a8f | 248 | CORE_ADDR l_addr, l_dynaddr, dynaddr; |
cc10cae3 | 249 | |
3957565a | 250 | l_addr = so->lm_info->l_addr_inferior; |
cc10cae3 | 251 | |
b23518f0 | 252 | if (! abfd || ! has_lm_dynamic_from_link_map ()) |
cc10cae3 AO |
253 | goto set_addr; |
254 | ||
3957565a | 255 | l_dynaddr = so->lm_info->l_ld; |
cc10cae3 AO |
256 | |
257 | dyninfo_sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
258 | if (dyninfo_sect == NULL) | |
259 | goto set_addr; | |
260 | ||
261 | dynaddr = bfd_section_vma (abfd, dyninfo_sect); | |
262 | ||
263 | if (dynaddr + l_addr != l_dynaddr) | |
264 | { | |
28f34a8f | 265 | CORE_ADDR align = 0x1000; |
4e1fc9c9 | 266 | CORE_ADDR minpagesize = align; |
28f34a8f | 267 | |
cc10cae3 AO |
268 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
269 | { | |
270 | Elf_Internal_Ehdr *ehdr = elf_tdata (abfd)->elf_header; | |
271 | Elf_Internal_Phdr *phdr = elf_tdata (abfd)->phdr; | |
272 | int i; | |
273 | ||
274 | align = 1; | |
275 | ||
276 | for (i = 0; i < ehdr->e_phnum; i++) | |
277 | if (phdr[i].p_type == PT_LOAD && phdr[i].p_align > align) | |
278 | align = phdr[i].p_align; | |
4e1fc9c9 JK |
279 | |
280 | minpagesize = get_elf_backend_data (abfd)->minpagesize; | |
cc10cae3 AO |
281 | } |
282 | ||
283 | /* Turn it into a mask. */ | |
284 | align--; | |
285 | ||
286 | /* If the changes match the alignment requirements, we | |
287 | assume we're using a core file that was generated by the | |
288 | same binary, just prelinked with a different base offset. | |
289 | If it doesn't match, we may have a different binary, the | |
290 | same binary with the dynamic table loaded at an unrelated | |
291 | location, or anything, really. To avoid regressions, | |
292 | don't adjust the base offset in the latter case, although | |
293 | odds are that, if things really changed, debugging won't | |
5c0d192f JK |
294 | quite work. |
295 | ||
296 | One could expect more the condition | |
297 | ((l_addr & align) == 0 && ((l_dynaddr - dynaddr) & align) == 0) | |
298 | but the one below is relaxed for PPC. The PPC kernel supports | |
299 | either 4k or 64k page sizes. To be prepared for 64k pages, | |
300 | PPC ELF files are built using an alignment requirement of 64k. | |
301 | However, when running on a kernel supporting 4k pages, the memory | |
302 | mapping of the library may not actually happen on a 64k boundary! | |
303 | ||
304 | (In the usual case where (l_addr & align) == 0, this check is | |
4e1fc9c9 JK |
305 | equivalent to the possibly expected check above.) |
306 | ||
307 | Even on PPC it must be zero-aligned at least for MINPAGESIZE. */ | |
5c0d192f | 308 | |
02835898 JK |
309 | l_addr = l_dynaddr - dynaddr; |
310 | ||
4e1fc9c9 JK |
311 | if ((l_addr & (minpagesize - 1)) == 0 |
312 | && (l_addr & align) == ((l_dynaddr - dynaddr) & align)) | |
cc10cae3 | 313 | { |
701ed6dc | 314 | if (info_verbose) |
ccf26247 JK |
315 | printf_unfiltered (_("Using PIC (Position Independent Code) " |
316 | "prelink displacement %s for \"%s\".\n"), | |
f5656ead | 317 | paddress (target_gdbarch (), l_addr), |
ccf26247 | 318 | so->so_name); |
cc10cae3 | 319 | } |
79d4c408 | 320 | else |
02835898 JK |
321 | { |
322 | /* There is no way to verify the library file matches. prelink | |
323 | can during prelinking of an unprelinked file (or unprelinking | |
324 | of a prelinked file) shift the DYNAMIC segment by arbitrary | |
325 | offset without any page size alignment. There is no way to | |
326 | find out the ELF header and/or Program Headers for a limited | |
327 | verification if it they match. One could do a verification | |
328 | of the DYNAMIC segment. Still the found address is the best | |
329 | one GDB could find. */ | |
330 | ||
331 | warning (_(".dynamic section for \"%s\" " | |
332 | "is not at the expected address " | |
333 | "(wrong library or version mismatch?)"), so->so_name); | |
334 | } | |
cc10cae3 AO |
335 | } |
336 | ||
337 | set_addr: | |
338 | so->lm_info->l_addr = l_addr; | |
3957565a | 339 | so->lm_info->l_addr_p = 1; |
cc10cae3 AO |
340 | } |
341 | ||
342 | return so->lm_info->l_addr; | |
343 | } | |
344 | ||
6c95b8df | 345 | /* Per pspace SVR4 specific data. */ |
13437d4b | 346 | |
1a816a87 PA |
347 | struct svr4_info |
348 | { | |
c378eb4e | 349 | CORE_ADDR debug_base; /* Base of dynamic linker structures. */ |
1a816a87 PA |
350 | |
351 | /* Validity flag for debug_loader_offset. */ | |
352 | int debug_loader_offset_p; | |
353 | ||
354 | /* Load address for the dynamic linker, inferred. */ | |
355 | CORE_ADDR debug_loader_offset; | |
356 | ||
357 | /* Name of the dynamic linker, valid if debug_loader_offset_p. */ | |
358 | char *debug_loader_name; | |
359 | ||
360 | /* Load map address for the main executable. */ | |
361 | CORE_ADDR main_lm_addr; | |
1a816a87 | 362 | |
6c95b8df PA |
363 | CORE_ADDR interp_text_sect_low; |
364 | CORE_ADDR interp_text_sect_high; | |
365 | CORE_ADDR interp_plt_sect_low; | |
366 | CORE_ADDR interp_plt_sect_high; | |
f9e14852 GB |
367 | |
368 | /* Nonzero if the list of objects was last obtained from the target | |
369 | via qXfer:libraries-svr4:read. */ | |
370 | int using_xfer; | |
371 | ||
372 | /* Table of struct probe_and_action instances, used by the | |
373 | probes-based interface to map breakpoint addresses to probes | |
374 | and their associated actions. Lookup is performed using | |
375 | probe_and_action->probe->address. */ | |
376 | htab_t probes_table; | |
377 | ||
378 | /* List of objects loaded into the inferior, used by the probes- | |
379 | based interface. */ | |
380 | struct so_list *solib_list; | |
6c95b8df | 381 | }; |
1a816a87 | 382 | |
6c95b8df PA |
383 | /* Per-program-space data key. */ |
384 | static const struct program_space_data *solib_svr4_pspace_data; | |
1a816a87 | 385 | |
f9e14852 GB |
386 | /* Free the probes table. */ |
387 | ||
388 | static void | |
389 | free_probes_table (struct svr4_info *info) | |
390 | { | |
391 | if (info->probes_table == NULL) | |
392 | return; | |
393 | ||
394 | htab_delete (info->probes_table); | |
395 | info->probes_table = NULL; | |
396 | } | |
397 | ||
398 | /* Free the solib list. */ | |
399 | ||
400 | static void | |
401 | free_solib_list (struct svr4_info *info) | |
402 | { | |
403 | svr4_free_library_list (&info->solib_list); | |
404 | info->solib_list = NULL; | |
405 | } | |
406 | ||
6c95b8df PA |
407 | static void |
408 | svr4_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
1a816a87 | 409 | { |
487ad57c | 410 | struct svr4_info *info = arg; |
f9e14852 GB |
411 | |
412 | free_probes_table (info); | |
413 | free_solib_list (info); | |
414 | ||
6c95b8df | 415 | xfree (info); |
1a816a87 PA |
416 | } |
417 | ||
6c95b8df PA |
418 | /* Get the current svr4 data. If none is found yet, add it now. This |
419 | function always returns a valid object. */ | |
34439770 | 420 | |
6c95b8df PA |
421 | static struct svr4_info * |
422 | get_svr4_info (void) | |
1a816a87 | 423 | { |
6c95b8df | 424 | struct svr4_info *info; |
1a816a87 | 425 | |
6c95b8df PA |
426 | info = program_space_data (current_program_space, solib_svr4_pspace_data); |
427 | if (info != NULL) | |
428 | return info; | |
34439770 | 429 | |
6c95b8df PA |
430 | info = XZALLOC (struct svr4_info); |
431 | set_program_space_data (current_program_space, solib_svr4_pspace_data, info); | |
432 | return info; | |
1a816a87 | 433 | } |
93a57060 | 434 | |
13437d4b KB |
435 | /* Local function prototypes */ |
436 | ||
bc043ef3 | 437 | static int match_main (const char *); |
13437d4b | 438 | |
97ec2c2f UW |
439 | /* Read program header TYPE from inferior memory. The header is found |
440 | by scanning the OS auxillary vector. | |
441 | ||
09919ac2 JK |
442 | If TYPE == -1, return the program headers instead of the contents of |
443 | one program header. | |
444 | ||
97ec2c2f UW |
445 | Return a pointer to allocated memory holding the program header contents, |
446 | or NULL on failure. If sucessful, and unless P_SECT_SIZE is NULL, the | |
447 | size of those contents is returned to P_SECT_SIZE. Likewise, the target | |
448 | architecture size (32-bit or 64-bit) is returned to P_ARCH_SIZE. */ | |
449 | ||
450 | static gdb_byte * | |
451 | read_program_header (int type, int *p_sect_size, int *p_arch_size) | |
452 | { | |
f5656ead | 453 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
43136979 | 454 | CORE_ADDR at_phdr, at_phent, at_phnum, pt_phdr = 0; |
97ec2c2f UW |
455 | int arch_size, sect_size; |
456 | CORE_ADDR sect_addr; | |
457 | gdb_byte *buf; | |
43136979 | 458 | int pt_phdr_p = 0; |
97ec2c2f UW |
459 | |
460 | /* Get required auxv elements from target. */ | |
461 | if (target_auxv_search (¤t_target, AT_PHDR, &at_phdr) <= 0) | |
462 | return 0; | |
463 | if (target_auxv_search (¤t_target, AT_PHENT, &at_phent) <= 0) | |
464 | return 0; | |
465 | if (target_auxv_search (¤t_target, AT_PHNUM, &at_phnum) <= 0) | |
466 | return 0; | |
467 | if (!at_phdr || !at_phnum) | |
468 | return 0; | |
469 | ||
470 | /* Determine ELF architecture type. */ | |
471 | if (at_phent == sizeof (Elf32_External_Phdr)) | |
472 | arch_size = 32; | |
473 | else if (at_phent == sizeof (Elf64_External_Phdr)) | |
474 | arch_size = 64; | |
475 | else | |
476 | return 0; | |
477 | ||
09919ac2 JK |
478 | /* Find the requested segment. */ |
479 | if (type == -1) | |
480 | { | |
481 | sect_addr = at_phdr; | |
482 | sect_size = at_phent * at_phnum; | |
483 | } | |
484 | else if (arch_size == 32) | |
97ec2c2f UW |
485 | { |
486 | Elf32_External_Phdr phdr; | |
487 | int i; | |
488 | ||
489 | /* Search for requested PHDR. */ | |
490 | for (i = 0; i < at_phnum; i++) | |
491 | { | |
43136979 AR |
492 | int p_type; |
493 | ||
97ec2c2f UW |
494 | if (target_read_memory (at_phdr + i * sizeof (phdr), |
495 | (gdb_byte *)&phdr, sizeof (phdr))) | |
496 | return 0; | |
497 | ||
43136979 AR |
498 | p_type = extract_unsigned_integer ((gdb_byte *) phdr.p_type, |
499 | 4, byte_order); | |
500 | ||
501 | if (p_type == PT_PHDR) | |
502 | { | |
503 | pt_phdr_p = 1; | |
504 | pt_phdr = extract_unsigned_integer ((gdb_byte *) phdr.p_vaddr, | |
505 | 4, byte_order); | |
506 | } | |
507 | ||
508 | if (p_type == type) | |
97ec2c2f UW |
509 | break; |
510 | } | |
511 | ||
512 | if (i == at_phnum) | |
513 | return 0; | |
514 | ||
515 | /* Retrieve address and size. */ | |
e17a4113 UW |
516 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
517 | 4, byte_order); | |
518 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
519 | 4, byte_order); | |
97ec2c2f UW |
520 | } |
521 | else | |
522 | { | |
523 | Elf64_External_Phdr phdr; | |
524 | int i; | |
525 | ||
526 | /* Search for requested PHDR. */ | |
527 | for (i = 0; i < at_phnum; i++) | |
528 | { | |
43136979 AR |
529 | int p_type; |
530 | ||
97ec2c2f UW |
531 | if (target_read_memory (at_phdr + i * sizeof (phdr), |
532 | (gdb_byte *)&phdr, sizeof (phdr))) | |
533 | return 0; | |
534 | ||
43136979 AR |
535 | p_type = extract_unsigned_integer ((gdb_byte *) phdr.p_type, |
536 | 4, byte_order); | |
537 | ||
538 | if (p_type == PT_PHDR) | |
539 | { | |
540 | pt_phdr_p = 1; | |
541 | pt_phdr = extract_unsigned_integer ((gdb_byte *) phdr.p_vaddr, | |
542 | 8, byte_order); | |
543 | } | |
544 | ||
545 | if (p_type == type) | |
97ec2c2f UW |
546 | break; |
547 | } | |
548 | ||
549 | if (i == at_phnum) | |
550 | return 0; | |
551 | ||
552 | /* Retrieve address and size. */ | |
e17a4113 UW |
553 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
554 | 8, byte_order); | |
555 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
556 | 8, byte_order); | |
97ec2c2f UW |
557 | } |
558 | ||
43136979 AR |
559 | /* PT_PHDR is optional, but we really need it |
560 | for PIE to make this work in general. */ | |
561 | ||
562 | if (pt_phdr_p) | |
563 | { | |
564 | /* at_phdr is real address in memory. pt_phdr is what pheader says it is. | |
565 | Relocation offset is the difference between the two. */ | |
566 | sect_addr = sect_addr + (at_phdr - pt_phdr); | |
567 | } | |
568 | ||
97ec2c2f UW |
569 | /* Read in requested program header. */ |
570 | buf = xmalloc (sect_size); | |
571 | if (target_read_memory (sect_addr, buf, sect_size)) | |
572 | { | |
573 | xfree (buf); | |
574 | return NULL; | |
575 | } | |
576 | ||
577 | if (p_arch_size) | |
578 | *p_arch_size = arch_size; | |
579 | if (p_sect_size) | |
580 | *p_sect_size = sect_size; | |
581 | ||
582 | return buf; | |
583 | } | |
584 | ||
585 | ||
586 | /* Return program interpreter string. */ | |
001f13d8 | 587 | static char * |
97ec2c2f UW |
588 | find_program_interpreter (void) |
589 | { | |
590 | gdb_byte *buf = NULL; | |
591 | ||
592 | /* If we have an exec_bfd, use its section table. */ | |
593 | if (exec_bfd | |
594 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
595 | { | |
596 | struct bfd_section *interp_sect; | |
597 | ||
598 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
599 | if (interp_sect != NULL) | |
600 | { | |
97ec2c2f UW |
601 | int sect_size = bfd_section_size (exec_bfd, interp_sect); |
602 | ||
603 | buf = xmalloc (sect_size); | |
604 | bfd_get_section_contents (exec_bfd, interp_sect, buf, 0, sect_size); | |
605 | } | |
606 | } | |
607 | ||
608 | /* If we didn't find it, use the target auxillary vector. */ | |
609 | if (!buf) | |
610 | buf = read_program_header (PT_INTERP, NULL, NULL); | |
611 | ||
001f13d8 | 612 | return (char *) buf; |
97ec2c2f UW |
613 | } |
614 | ||
615 | ||
c378eb4e | 616 | /* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is |
3a40aaa0 UW |
617 | returned and the corresponding PTR is set. */ |
618 | ||
619 | static int | |
620 | scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr) | |
621 | { | |
622 | int arch_size, step, sect_size; | |
623 | long dyn_tag; | |
b381ea14 | 624 | CORE_ADDR dyn_ptr, dyn_addr; |
65728c26 | 625 | gdb_byte *bufend, *bufstart, *buf; |
3a40aaa0 UW |
626 | Elf32_External_Dyn *x_dynp_32; |
627 | Elf64_External_Dyn *x_dynp_64; | |
628 | struct bfd_section *sect; | |
61f0d762 | 629 | struct target_section *target_section; |
3a40aaa0 UW |
630 | |
631 | if (abfd == NULL) | |
632 | return 0; | |
0763ab81 PA |
633 | |
634 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
635 | return 0; | |
636 | ||
3a40aaa0 UW |
637 | arch_size = bfd_get_arch_size (abfd); |
638 | if (arch_size == -1) | |
0763ab81 | 639 | return 0; |
3a40aaa0 UW |
640 | |
641 | /* Find the start address of the .dynamic section. */ | |
642 | sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
643 | if (sect == NULL) | |
644 | return 0; | |
61f0d762 JK |
645 | |
646 | for (target_section = current_target_sections->sections; | |
647 | target_section < current_target_sections->sections_end; | |
648 | target_section++) | |
649 | if (sect == target_section->the_bfd_section) | |
650 | break; | |
b381ea14 JK |
651 | if (target_section < current_target_sections->sections_end) |
652 | dyn_addr = target_section->addr; | |
653 | else | |
654 | { | |
655 | /* ABFD may come from OBJFILE acting only as a symbol file without being | |
656 | loaded into the target (see add_symbol_file_command). This case is | |
657 | such fallback to the file VMA address without the possibility of | |
658 | having the section relocated to its actual in-memory address. */ | |
659 | ||
660 | dyn_addr = bfd_section_vma (abfd, sect); | |
661 | } | |
3a40aaa0 | 662 | |
65728c26 DJ |
663 | /* Read in .dynamic from the BFD. We will get the actual value |
664 | from memory later. */ | |
3a40aaa0 | 665 | sect_size = bfd_section_size (abfd, sect); |
65728c26 DJ |
666 | buf = bufstart = alloca (sect_size); |
667 | if (!bfd_get_section_contents (abfd, sect, | |
668 | buf, 0, sect_size)) | |
669 | return 0; | |
3a40aaa0 UW |
670 | |
671 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
672 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
673 | : sizeof (Elf64_External_Dyn); | |
674 | for (bufend = buf + sect_size; | |
675 | buf < bufend; | |
676 | buf += step) | |
677 | { | |
678 | if (arch_size == 32) | |
679 | { | |
680 | x_dynp_32 = (Elf32_External_Dyn *) buf; | |
681 | dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag); | |
682 | dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr); | |
683 | } | |
65728c26 | 684 | else |
3a40aaa0 UW |
685 | { |
686 | x_dynp_64 = (Elf64_External_Dyn *) buf; | |
687 | dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag); | |
688 | dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr); | |
689 | } | |
690 | if (dyn_tag == DT_NULL) | |
691 | return 0; | |
692 | if (dyn_tag == dyntag) | |
693 | { | |
65728c26 DJ |
694 | /* If requested, try to read the runtime value of this .dynamic |
695 | entry. */ | |
3a40aaa0 | 696 | if (ptr) |
65728c26 | 697 | { |
b6da22b0 | 698 | struct type *ptr_type; |
65728c26 DJ |
699 | gdb_byte ptr_buf[8]; |
700 | CORE_ADDR ptr_addr; | |
701 | ||
f5656ead | 702 | ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
b381ea14 | 703 | ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8; |
65728c26 | 704 | if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0) |
b6da22b0 | 705 | dyn_ptr = extract_typed_address (ptr_buf, ptr_type); |
65728c26 DJ |
706 | *ptr = dyn_ptr; |
707 | } | |
708 | return 1; | |
3a40aaa0 UW |
709 | } |
710 | } | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
97ec2c2f UW |
715 | /* Scan for DYNTAG in .dynamic section of the target's main executable, |
716 | found by consulting the OS auxillary vector. If DYNTAG is found 1 is | |
717 | returned and the corresponding PTR is set. */ | |
718 | ||
719 | static int | |
720 | scan_dyntag_auxv (int dyntag, CORE_ADDR *ptr) | |
721 | { | |
f5656ead | 722 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
97ec2c2f UW |
723 | int sect_size, arch_size, step; |
724 | long dyn_tag; | |
725 | CORE_ADDR dyn_ptr; | |
726 | gdb_byte *bufend, *bufstart, *buf; | |
727 | ||
728 | /* Read in .dynamic section. */ | |
729 | buf = bufstart = read_program_header (PT_DYNAMIC, §_size, &arch_size); | |
730 | if (!buf) | |
731 | return 0; | |
732 | ||
733 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
734 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
735 | : sizeof (Elf64_External_Dyn); | |
736 | for (bufend = buf + sect_size; | |
737 | buf < bufend; | |
738 | buf += step) | |
739 | { | |
740 | if (arch_size == 32) | |
741 | { | |
742 | Elf32_External_Dyn *dynp = (Elf32_External_Dyn *) buf; | |
433759f7 | 743 | |
e17a4113 UW |
744 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
745 | 4, byte_order); | |
746 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
747 | 4, byte_order); | |
97ec2c2f UW |
748 | } |
749 | else | |
750 | { | |
751 | Elf64_External_Dyn *dynp = (Elf64_External_Dyn *) buf; | |
433759f7 | 752 | |
e17a4113 UW |
753 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
754 | 8, byte_order); | |
755 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
756 | 8, byte_order); | |
97ec2c2f UW |
757 | } |
758 | if (dyn_tag == DT_NULL) | |
759 | break; | |
760 | ||
761 | if (dyn_tag == dyntag) | |
762 | { | |
763 | if (ptr) | |
764 | *ptr = dyn_ptr; | |
765 | ||
766 | xfree (bufstart); | |
767 | return 1; | |
768 | } | |
769 | } | |
770 | ||
771 | xfree (bufstart); | |
772 | return 0; | |
773 | } | |
774 | ||
7f86f058 PA |
775 | /* Locate the base address of dynamic linker structs for SVR4 elf |
776 | targets. | |
13437d4b KB |
777 | |
778 | For SVR4 elf targets the address of the dynamic linker's runtime | |
779 | structure is contained within the dynamic info section in the | |
780 | executable file. The dynamic section is also mapped into the | |
781 | inferior address space. Because the runtime loader fills in the | |
782 | real address before starting the inferior, we have to read in the | |
783 | dynamic info section from the inferior address space. | |
784 | If there are any errors while trying to find the address, we | |
7f86f058 | 785 | silently return 0, otherwise the found address is returned. */ |
13437d4b KB |
786 | |
787 | static CORE_ADDR | |
788 | elf_locate_base (void) | |
789 | { | |
3a40aaa0 UW |
790 | struct minimal_symbol *msymbol; |
791 | CORE_ADDR dyn_ptr; | |
13437d4b | 792 | |
65728c26 DJ |
793 | /* Look for DT_MIPS_RLD_MAP first. MIPS executables use this |
794 | instead of DT_DEBUG, although they sometimes contain an unused | |
795 | DT_DEBUG. */ | |
97ec2c2f UW |
796 | if (scan_dyntag (DT_MIPS_RLD_MAP, exec_bfd, &dyn_ptr) |
797 | || scan_dyntag_auxv (DT_MIPS_RLD_MAP, &dyn_ptr)) | |
3a40aaa0 | 798 | { |
f5656ead | 799 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
3a40aaa0 | 800 | gdb_byte *pbuf; |
b6da22b0 | 801 | int pbuf_size = TYPE_LENGTH (ptr_type); |
433759f7 | 802 | |
3a40aaa0 UW |
803 | pbuf = alloca (pbuf_size); |
804 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
805 | of the dynamic link structure. */ | |
806 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) | |
e499d0f1 | 807 | return 0; |
b6da22b0 | 808 | return extract_typed_address (pbuf, ptr_type); |
e499d0f1 DJ |
809 | } |
810 | ||
65728c26 | 811 | /* Find DT_DEBUG. */ |
97ec2c2f UW |
812 | if (scan_dyntag (DT_DEBUG, exec_bfd, &dyn_ptr) |
813 | || scan_dyntag_auxv (DT_DEBUG, &dyn_ptr)) | |
65728c26 DJ |
814 | return dyn_ptr; |
815 | ||
3a40aaa0 UW |
816 | /* This may be a static executable. Look for the symbol |
817 | conventionally named _r_debug, as a last resort. */ | |
818 | msymbol = lookup_minimal_symbol ("_r_debug", NULL, symfile_objfile); | |
819 | if (msymbol != NULL) | |
820 | return SYMBOL_VALUE_ADDRESS (msymbol); | |
13437d4b KB |
821 | |
822 | /* DT_DEBUG entry not found. */ | |
823 | return 0; | |
824 | } | |
825 | ||
7f86f058 | 826 | /* Locate the base address of dynamic linker structs. |
13437d4b KB |
827 | |
828 | For both the SunOS and SVR4 shared library implementations, if the | |
829 | inferior executable has been linked dynamically, there is a single | |
830 | address somewhere in the inferior's data space which is the key to | |
831 | locating all of the dynamic linker's runtime structures. This | |
832 | address is the value of the debug base symbol. The job of this | |
833 | function is to find and return that address, or to return 0 if there | |
834 | is no such address (the executable is statically linked for example). | |
835 | ||
836 | For SunOS, the job is almost trivial, since the dynamic linker and | |
837 | all of it's structures are statically linked to the executable at | |
838 | link time. Thus the symbol for the address we are looking for has | |
839 | already been added to the minimal symbol table for the executable's | |
840 | objfile at the time the symbol file's symbols were read, and all we | |
841 | have to do is look it up there. Note that we explicitly do NOT want | |
842 | to find the copies in the shared library. | |
843 | ||
844 | The SVR4 version is a bit more complicated because the address | |
845 | is contained somewhere in the dynamic info section. We have to go | |
846 | to a lot more work to discover the address of the debug base symbol. | |
847 | Because of this complexity, we cache the value we find and return that | |
848 | value on subsequent invocations. Note there is no copy in the | |
7f86f058 | 849 | executable symbol tables. */ |
13437d4b KB |
850 | |
851 | static CORE_ADDR | |
1a816a87 | 852 | locate_base (struct svr4_info *info) |
13437d4b | 853 | { |
13437d4b KB |
854 | /* Check to see if we have a currently valid address, and if so, avoid |
855 | doing all this work again and just return the cached address. If | |
856 | we have no cached address, try to locate it in the dynamic info | |
d5a921c9 KB |
857 | section for ELF executables. There's no point in doing any of this |
858 | though if we don't have some link map offsets to work with. */ | |
13437d4b | 859 | |
1a816a87 | 860 | if (info->debug_base == 0 && svr4_have_link_map_offsets ()) |
0763ab81 | 861 | info->debug_base = elf_locate_base (); |
1a816a87 | 862 | return info->debug_base; |
13437d4b KB |
863 | } |
864 | ||
e4cd0d6a | 865 | /* Find the first element in the inferior's dynamic link map, and |
6f992fbf JB |
866 | return its address in the inferior. Return zero if the address |
867 | could not be determined. | |
13437d4b | 868 | |
e4cd0d6a MK |
869 | FIXME: Perhaps we should validate the info somehow, perhaps by |
870 | checking r_version for a known version number, or r_state for | |
871 | RT_CONSISTENT. */ | |
13437d4b KB |
872 | |
873 | static CORE_ADDR | |
1a816a87 | 874 | solib_svr4_r_map (struct svr4_info *info) |
13437d4b | 875 | { |
4b188b9f | 876 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f5656ead | 877 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
08597104 JB |
878 | CORE_ADDR addr = 0; |
879 | volatile struct gdb_exception ex; | |
13437d4b | 880 | |
08597104 JB |
881 | TRY_CATCH (ex, RETURN_MASK_ERROR) |
882 | { | |
883 | addr = read_memory_typed_address (info->debug_base + lmo->r_map_offset, | |
884 | ptr_type); | |
885 | } | |
886 | exception_print (gdb_stderr, ex); | |
887 | return addr; | |
e4cd0d6a | 888 | } |
13437d4b | 889 | |
7cd25cfc DJ |
890 | /* Find r_brk from the inferior's debug base. */ |
891 | ||
892 | static CORE_ADDR | |
1a816a87 | 893 | solib_svr4_r_brk (struct svr4_info *info) |
7cd25cfc DJ |
894 | { |
895 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
f5656ead | 896 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
7cd25cfc | 897 | |
1a816a87 PA |
898 | return read_memory_typed_address (info->debug_base + lmo->r_brk_offset, |
899 | ptr_type); | |
7cd25cfc DJ |
900 | } |
901 | ||
e4cd0d6a MK |
902 | /* Find the link map for the dynamic linker (if it is not in the |
903 | normal list of loaded shared objects). */ | |
13437d4b | 904 | |
e4cd0d6a | 905 | static CORE_ADDR |
1a816a87 | 906 | solib_svr4_r_ldsomap (struct svr4_info *info) |
e4cd0d6a MK |
907 | { |
908 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
f5656ead TT |
909 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
910 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); | |
e4cd0d6a | 911 | ULONGEST version; |
13437d4b | 912 | |
e4cd0d6a MK |
913 | /* Check version, and return zero if `struct r_debug' doesn't have |
914 | the r_ldsomap member. */ | |
1a816a87 PA |
915 | version |
916 | = read_memory_unsigned_integer (info->debug_base + lmo->r_version_offset, | |
e17a4113 | 917 | lmo->r_version_size, byte_order); |
e4cd0d6a MK |
918 | if (version < 2 || lmo->r_ldsomap_offset == -1) |
919 | return 0; | |
13437d4b | 920 | |
1a816a87 | 921 | return read_memory_typed_address (info->debug_base + lmo->r_ldsomap_offset, |
b6da22b0 | 922 | ptr_type); |
13437d4b KB |
923 | } |
924 | ||
de18c1d8 JM |
925 | /* On Solaris systems with some versions of the dynamic linker, |
926 | ld.so's l_name pointer points to the SONAME in the string table | |
927 | rather than into writable memory. So that GDB can find shared | |
928 | libraries when loading a core file generated by gcore, ensure that | |
929 | memory areas containing the l_name string are saved in the core | |
930 | file. */ | |
931 | ||
932 | static int | |
933 | svr4_keep_data_in_core (CORE_ADDR vaddr, unsigned long size) | |
934 | { | |
935 | struct svr4_info *info; | |
936 | CORE_ADDR ldsomap; | |
937 | struct so_list *new; | |
938 | struct cleanup *old_chain; | |
74de0234 | 939 | CORE_ADDR name_lm; |
de18c1d8 JM |
940 | |
941 | info = get_svr4_info (); | |
942 | ||
943 | info->debug_base = 0; | |
944 | locate_base (info); | |
945 | if (!info->debug_base) | |
946 | return 0; | |
947 | ||
948 | ldsomap = solib_svr4_r_ldsomap (info); | |
949 | if (!ldsomap) | |
950 | return 0; | |
951 | ||
de18c1d8 JM |
952 | new = XZALLOC (struct so_list); |
953 | old_chain = make_cleanup (xfree, new); | |
3957565a | 954 | new->lm_info = lm_info_read (ldsomap); |
de18c1d8 | 955 | make_cleanup (xfree, new->lm_info); |
3957565a | 956 | name_lm = new->lm_info ? new->lm_info->l_name : 0; |
de18c1d8 JM |
957 | do_cleanups (old_chain); |
958 | ||
74de0234 | 959 | return (name_lm >= vaddr && name_lm < vaddr + size); |
de18c1d8 JM |
960 | } |
961 | ||
7f86f058 | 962 | /* Implement the "open_symbol_file_object" target_so_ops method. |
13437d4b | 963 | |
7f86f058 PA |
964 | If no open symbol file, attempt to locate and open the main symbol |
965 | file. On SVR4 systems, this is the first link map entry. If its | |
966 | name is here, we can open it. Useful when attaching to a process | |
967 | without first loading its symbol file. */ | |
13437d4b KB |
968 | |
969 | static int | |
970 | open_symbol_file_object (void *from_ttyp) | |
971 | { | |
972 | CORE_ADDR lm, l_name; | |
973 | char *filename; | |
974 | int errcode; | |
975 | int from_tty = *(int *)from_ttyp; | |
4b188b9f | 976 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f5656ead | 977 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
b6da22b0 | 978 | int l_name_size = TYPE_LENGTH (ptr_type); |
cfaefc65 | 979 | gdb_byte *l_name_buf = xmalloc (l_name_size); |
b8c9b27d | 980 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); |
6c95b8df | 981 | struct svr4_info *info = get_svr4_info (); |
13437d4b KB |
982 | |
983 | if (symfile_objfile) | |
9e2f0ad4 | 984 | if (!query (_("Attempt to reload symbols from process? "))) |
3bb47e8b TT |
985 | { |
986 | do_cleanups (cleanups); | |
987 | return 0; | |
988 | } | |
13437d4b | 989 | |
7cd25cfc | 990 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
991 | info->debug_base = 0; |
992 | if (locate_base (info) == 0) | |
3bb47e8b TT |
993 | { |
994 | do_cleanups (cleanups); | |
995 | return 0; /* failed somehow... */ | |
996 | } | |
13437d4b KB |
997 | |
998 | /* First link map member should be the executable. */ | |
1a816a87 | 999 | lm = solib_svr4_r_map (info); |
e4cd0d6a | 1000 | if (lm == 0) |
3bb47e8b TT |
1001 | { |
1002 | do_cleanups (cleanups); | |
1003 | return 0; /* failed somehow... */ | |
1004 | } | |
13437d4b KB |
1005 | |
1006 | /* Read address of name from target memory to GDB. */ | |
cfaefc65 | 1007 | read_memory (lm + lmo->l_name_offset, l_name_buf, l_name_size); |
13437d4b | 1008 | |
cfaefc65 | 1009 | /* Convert the address to host format. */ |
b6da22b0 | 1010 | l_name = extract_typed_address (l_name_buf, ptr_type); |
13437d4b | 1011 | |
13437d4b | 1012 | if (l_name == 0) |
3bb47e8b TT |
1013 | { |
1014 | do_cleanups (cleanups); | |
1015 | return 0; /* No filename. */ | |
1016 | } | |
13437d4b KB |
1017 | |
1018 | /* Now fetch the filename from target memory. */ | |
1019 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
ea5bf0a1 | 1020 | make_cleanup (xfree, filename); |
13437d4b KB |
1021 | |
1022 | if (errcode) | |
1023 | { | |
8a3fe4f8 | 1024 | warning (_("failed to read exec filename from attached file: %s"), |
13437d4b | 1025 | safe_strerror (errcode)); |
3bb47e8b | 1026 | do_cleanups (cleanups); |
13437d4b KB |
1027 | return 0; |
1028 | } | |
1029 | ||
13437d4b | 1030 | /* Have a pathname: read the symbol file. */ |
1adeb98a | 1031 | symbol_file_add_main (filename, from_tty); |
13437d4b | 1032 | |
3bb47e8b | 1033 | do_cleanups (cleanups); |
13437d4b KB |
1034 | return 1; |
1035 | } | |
13437d4b | 1036 | |
2268b414 JK |
1037 | /* Data exchange structure for the XML parser as returned by |
1038 | svr4_current_sos_via_xfer_libraries. */ | |
1039 | ||
1040 | struct svr4_library_list | |
1041 | { | |
1042 | struct so_list *head, **tailp; | |
1043 | ||
1044 | /* Inferior address of struct link_map used for the main executable. It is | |
1045 | NULL if not known. */ | |
1046 | CORE_ADDR main_lm; | |
1047 | }; | |
1048 | ||
93f2a35e JK |
1049 | /* Implementation for target_so_ops.free_so. */ |
1050 | ||
1051 | static void | |
1052 | svr4_free_so (struct so_list *so) | |
1053 | { | |
1054 | xfree (so->lm_info); | |
1055 | } | |
1056 | ||
0892cb63 DE |
1057 | /* Implement target_so_ops.clear_so. */ |
1058 | ||
1059 | static void | |
1060 | svr4_clear_so (struct so_list *so) | |
1061 | { | |
6dcc1893 PP |
1062 | if (so->lm_info != NULL) |
1063 | so->lm_info->l_addr_p = 0; | |
0892cb63 DE |
1064 | } |
1065 | ||
93f2a35e JK |
1066 | /* Free so_list built so far (called via cleanup). */ |
1067 | ||
1068 | static void | |
1069 | svr4_free_library_list (void *p_list) | |
1070 | { | |
1071 | struct so_list *list = *(struct so_list **) p_list; | |
1072 | ||
1073 | while (list != NULL) | |
1074 | { | |
1075 | struct so_list *next = list->next; | |
1076 | ||
3756ef7e | 1077 | free_so (list); |
93f2a35e JK |
1078 | list = next; |
1079 | } | |
1080 | } | |
1081 | ||
f9e14852 GB |
1082 | /* Copy library list. */ |
1083 | ||
1084 | static struct so_list * | |
1085 | svr4_copy_library_list (struct so_list *src) | |
1086 | { | |
1087 | struct so_list *dst = NULL; | |
1088 | struct so_list **link = &dst; | |
1089 | ||
1090 | while (src != NULL) | |
1091 | { | |
1092 | struct so_list *new; | |
1093 | ||
1094 | new = xmalloc (sizeof (struct so_list)); | |
1095 | memcpy (new, src, sizeof (struct so_list)); | |
1096 | ||
1097 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
1098 | memcpy (new->lm_info, src->lm_info, sizeof (struct lm_info)); | |
1099 | ||
1100 | new->next = NULL; | |
1101 | *link = new; | |
1102 | link = &new->next; | |
1103 | ||
1104 | src = src->next; | |
1105 | } | |
1106 | ||
1107 | return dst; | |
1108 | } | |
1109 | ||
2268b414 JK |
1110 | #ifdef HAVE_LIBEXPAT |
1111 | ||
1112 | #include "xml-support.h" | |
1113 | ||
1114 | /* Handle the start of a <library> element. Note: new elements are added | |
1115 | at the tail of the list, keeping the list in order. */ | |
1116 | ||
1117 | static void | |
1118 | library_list_start_library (struct gdb_xml_parser *parser, | |
1119 | const struct gdb_xml_element *element, | |
1120 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
1121 | { | |
1122 | struct svr4_library_list *list = user_data; | |
1123 | const char *name = xml_find_attribute (attributes, "name")->value; | |
1124 | ULONGEST *lmp = xml_find_attribute (attributes, "lm")->value; | |
1125 | ULONGEST *l_addrp = xml_find_attribute (attributes, "l_addr")->value; | |
1126 | ULONGEST *l_ldp = xml_find_attribute (attributes, "l_ld")->value; | |
1127 | struct so_list *new_elem; | |
1128 | ||
1129 | new_elem = XZALLOC (struct so_list); | |
1130 | new_elem->lm_info = XZALLOC (struct lm_info); | |
1131 | new_elem->lm_info->lm_addr = *lmp; | |
1132 | new_elem->lm_info->l_addr_inferior = *l_addrp; | |
1133 | new_elem->lm_info->l_ld = *l_ldp; | |
1134 | ||
1135 | strncpy (new_elem->so_name, name, sizeof (new_elem->so_name) - 1); | |
1136 | new_elem->so_name[sizeof (new_elem->so_name) - 1] = 0; | |
1137 | strcpy (new_elem->so_original_name, new_elem->so_name); | |
1138 | ||
1139 | *list->tailp = new_elem; | |
1140 | list->tailp = &new_elem->next; | |
1141 | } | |
1142 | ||
1143 | /* Handle the start of a <library-list-svr4> element. */ | |
1144 | ||
1145 | static void | |
1146 | svr4_library_list_start_list (struct gdb_xml_parser *parser, | |
1147 | const struct gdb_xml_element *element, | |
1148 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
1149 | { | |
1150 | struct svr4_library_list *list = user_data; | |
1151 | const char *version = xml_find_attribute (attributes, "version")->value; | |
1152 | struct gdb_xml_value *main_lm = xml_find_attribute (attributes, "main-lm"); | |
1153 | ||
1154 | if (strcmp (version, "1.0") != 0) | |
1155 | gdb_xml_error (parser, | |
1156 | _("SVR4 Library list has unsupported version \"%s\""), | |
1157 | version); | |
1158 | ||
1159 | if (main_lm) | |
1160 | list->main_lm = *(ULONGEST *) main_lm->value; | |
1161 | } | |
1162 | ||
1163 | /* The allowed elements and attributes for an XML library list. | |
1164 | The root element is a <library-list>. */ | |
1165 | ||
1166 | static const struct gdb_xml_attribute svr4_library_attributes[] = | |
1167 | { | |
1168 | { "name", GDB_XML_AF_NONE, NULL, NULL }, | |
1169 | { "lm", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
1170 | { "l_addr", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
1171 | { "l_ld", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
1172 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
1173 | }; | |
1174 | ||
1175 | static const struct gdb_xml_element svr4_library_list_children[] = | |
1176 | { | |
1177 | { | |
1178 | "library", svr4_library_attributes, NULL, | |
1179 | GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, | |
1180 | library_list_start_library, NULL | |
1181 | }, | |
1182 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
1183 | }; | |
1184 | ||
1185 | static const struct gdb_xml_attribute svr4_library_list_attributes[] = | |
1186 | { | |
1187 | { "version", GDB_XML_AF_NONE, NULL, NULL }, | |
1188 | { "main-lm", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL }, | |
1189 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
1190 | }; | |
1191 | ||
1192 | static const struct gdb_xml_element svr4_library_list_elements[] = | |
1193 | { | |
1194 | { "library-list-svr4", svr4_library_list_attributes, svr4_library_list_children, | |
1195 | GDB_XML_EF_NONE, svr4_library_list_start_list, NULL }, | |
1196 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
1197 | }; | |
1198 | ||
2268b414 JK |
1199 | /* Parse qXfer:libraries:read packet into *SO_LIST_RETURN. Return 1 if |
1200 | ||
1201 | Return 0 if packet not supported, *SO_LIST_RETURN is not modified in such | |
1202 | case. Return 1 if *SO_LIST_RETURN contains the library list, it may be | |
1203 | empty, caller is responsible for freeing all its entries. */ | |
1204 | ||
1205 | static int | |
1206 | svr4_parse_libraries (const char *document, struct svr4_library_list *list) | |
1207 | { | |
1208 | struct cleanup *back_to = make_cleanup (svr4_free_library_list, | |
1209 | &list->head); | |
1210 | ||
1211 | memset (list, 0, sizeof (*list)); | |
1212 | list->tailp = &list->head; | |
1213 | if (gdb_xml_parse_quick (_("target library list"), "library-list.dtd", | |
1214 | svr4_library_list_elements, document, list) == 0) | |
1215 | { | |
1216 | /* Parsed successfully, keep the result. */ | |
1217 | discard_cleanups (back_to); | |
1218 | return 1; | |
1219 | } | |
1220 | ||
1221 | do_cleanups (back_to); | |
1222 | return 0; | |
1223 | } | |
1224 | ||
f9e14852 | 1225 | /* Attempt to get so_list from target via qXfer:libraries-svr4:read packet. |
2268b414 JK |
1226 | |
1227 | Return 0 if packet not supported, *SO_LIST_RETURN is not modified in such | |
1228 | case. Return 1 if *SO_LIST_RETURN contains the library list, it may be | |
f9e14852 GB |
1229 | empty, caller is responsible for freeing all its entries. |
1230 | ||
1231 | Note that ANNEX must be NULL if the remote does not explicitly allow | |
1232 | qXfer:libraries-svr4:read packets with non-empty annexes. Support for | |
1233 | this can be checked using target_augmented_libraries_svr4_read (). */ | |
2268b414 JK |
1234 | |
1235 | static int | |
f9e14852 GB |
1236 | svr4_current_sos_via_xfer_libraries (struct svr4_library_list *list, |
1237 | const char *annex) | |
2268b414 JK |
1238 | { |
1239 | char *svr4_library_document; | |
1240 | int result; | |
1241 | struct cleanup *back_to; | |
1242 | ||
f9e14852 GB |
1243 | gdb_assert (annex == NULL || target_augmented_libraries_svr4_read ()); |
1244 | ||
2268b414 JK |
1245 | /* Fetch the list of shared libraries. */ |
1246 | svr4_library_document = target_read_stralloc (¤t_target, | |
1247 | TARGET_OBJECT_LIBRARIES_SVR4, | |
f9e14852 | 1248 | annex); |
2268b414 JK |
1249 | if (svr4_library_document == NULL) |
1250 | return 0; | |
1251 | ||
1252 | back_to = make_cleanup (xfree, svr4_library_document); | |
1253 | result = svr4_parse_libraries (svr4_library_document, list); | |
1254 | do_cleanups (back_to); | |
1255 | ||
1256 | return result; | |
1257 | } | |
1258 | ||
1259 | #else | |
1260 | ||
1261 | static int | |
f9e14852 GB |
1262 | svr4_current_sos_via_xfer_libraries (struct svr4_library_list *list, |
1263 | const char *annex) | |
2268b414 JK |
1264 | { |
1265 | return 0; | |
1266 | } | |
1267 | ||
1268 | #endif | |
1269 | ||
34439770 DJ |
1270 | /* If no shared library information is available from the dynamic |
1271 | linker, build a fallback list from other sources. */ | |
1272 | ||
1273 | static struct so_list * | |
1274 | svr4_default_sos (void) | |
1275 | { | |
6c95b8df | 1276 | struct svr4_info *info = get_svr4_info (); |
8e5c319d | 1277 | struct so_list *new; |
1a816a87 | 1278 | |
8e5c319d JK |
1279 | if (!info->debug_loader_offset_p) |
1280 | return NULL; | |
34439770 | 1281 | |
8e5c319d | 1282 | new = XZALLOC (struct so_list); |
34439770 | 1283 | |
3957565a | 1284 | new->lm_info = xzalloc (sizeof (struct lm_info)); |
34439770 | 1285 | |
3957565a | 1286 | /* Nothing will ever check the other fields if we set l_addr_p. */ |
8e5c319d | 1287 | new->lm_info->l_addr = info->debug_loader_offset; |
3957565a | 1288 | new->lm_info->l_addr_p = 1; |
34439770 | 1289 | |
8e5c319d JK |
1290 | strncpy (new->so_name, info->debug_loader_name, SO_NAME_MAX_PATH_SIZE - 1); |
1291 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
1292 | strcpy (new->so_original_name, new->so_name); | |
34439770 | 1293 | |
8e5c319d | 1294 | return new; |
34439770 DJ |
1295 | } |
1296 | ||
f9e14852 GB |
1297 | /* Read the whole inferior libraries chain starting at address LM. |
1298 | Expect the first entry in the chain's previous entry to be PREV_LM. | |
1299 | Add the entries to the tail referenced by LINK_PTR_PTR. Ignore the | |
1300 | first entry if IGNORE_FIRST and set global MAIN_LM_ADDR according | |
1301 | to it. Returns nonzero upon success. If zero is returned the | |
1302 | entries stored to LINK_PTR_PTR are still valid although they may | |
1303 | represent only part of the inferior library list. */ | |
13437d4b | 1304 | |
f9e14852 GB |
1305 | static int |
1306 | svr4_read_so_list (CORE_ADDR lm, CORE_ADDR prev_lm, | |
1307 | struct so_list ***link_ptr_ptr, int ignore_first) | |
13437d4b | 1308 | { |
7d760051 | 1309 | struct so_list *first = NULL; |
f9e14852 | 1310 | CORE_ADDR next_lm; |
13437d4b | 1311 | |
cb08cc53 | 1312 | for (; lm != 0; prev_lm = lm, lm = next_lm) |
13437d4b | 1313 | { |
cb08cc53 JK |
1314 | struct so_list *new; |
1315 | struct cleanup *old_chain; | |
1316 | int errcode; | |
1317 | char *buffer; | |
13437d4b | 1318 | |
cb08cc53 JK |
1319 | new = XZALLOC (struct so_list); |
1320 | old_chain = make_cleanup_free_so (new); | |
13437d4b | 1321 | |
3957565a JK |
1322 | new->lm_info = lm_info_read (lm); |
1323 | if (new->lm_info == NULL) | |
1324 | { | |
1325 | do_cleanups (old_chain); | |
f9e14852 | 1326 | return 0; |
3957565a | 1327 | } |
13437d4b | 1328 | |
3957565a | 1329 | next_lm = new->lm_info->l_next; |
492928e4 | 1330 | |
3957565a | 1331 | if (new->lm_info->l_prev != prev_lm) |
492928e4 | 1332 | { |
2268b414 | 1333 | warning (_("Corrupted shared library list: %s != %s"), |
f5656ead TT |
1334 | paddress (target_gdbarch (), prev_lm), |
1335 | paddress (target_gdbarch (), new->lm_info->l_prev)); | |
cb08cc53 | 1336 | do_cleanups (old_chain); |
f9e14852 | 1337 | return 0; |
492928e4 | 1338 | } |
13437d4b KB |
1339 | |
1340 | /* For SVR4 versions, the first entry in the link map is for the | |
1341 | inferior executable, so we must ignore it. For some versions of | |
1342 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1343 | does have a name, so we can no longer use a missing name to | |
c378eb4e | 1344 | decide when to ignore it. */ |
3957565a | 1345 | if (ignore_first && new->lm_info->l_prev == 0) |
93a57060 | 1346 | { |
cb08cc53 JK |
1347 | struct svr4_info *info = get_svr4_info (); |
1348 | ||
7d760051 | 1349 | first = new; |
1a816a87 | 1350 | info->main_lm_addr = new->lm_info->lm_addr; |
cb08cc53 JK |
1351 | do_cleanups (old_chain); |
1352 | continue; | |
93a57060 | 1353 | } |
13437d4b | 1354 | |
cb08cc53 | 1355 | /* Extract this shared object's name. */ |
3957565a | 1356 | target_read_string (new->lm_info->l_name, &buffer, |
cb08cc53 JK |
1357 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); |
1358 | if (errcode != 0) | |
1359 | { | |
7d760051 UW |
1360 | /* If this entry's l_name address matches that of the |
1361 | inferior executable, then this is not a normal shared | |
1362 | object, but (most likely) a vDSO. In this case, silently | |
1363 | skip it; otherwise emit a warning. */ | |
1364 | if (first == NULL | |
1365 | || new->lm_info->l_name != first->lm_info->l_name) | |
1366 | warning (_("Can't read pathname for load map: %s."), | |
1367 | safe_strerror (errcode)); | |
cb08cc53 JK |
1368 | do_cleanups (old_chain); |
1369 | continue; | |
13437d4b KB |
1370 | } |
1371 | ||
cb08cc53 JK |
1372 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); |
1373 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
1374 | strcpy (new->so_original_name, new->so_name); | |
1375 | xfree (buffer); | |
492928e4 | 1376 | |
cb08cc53 JK |
1377 | /* If this entry has no name, or its name matches the name |
1378 | for the main executable, don't include it in the list. */ | |
1379 | if (! new->so_name[0] || match_main (new->so_name)) | |
492928e4 | 1380 | { |
cb08cc53 JK |
1381 | do_cleanups (old_chain); |
1382 | continue; | |
492928e4 | 1383 | } |
e4cd0d6a | 1384 | |
13437d4b | 1385 | discard_cleanups (old_chain); |
cb08cc53 JK |
1386 | new->next = 0; |
1387 | **link_ptr_ptr = new; | |
1388 | *link_ptr_ptr = &new->next; | |
13437d4b | 1389 | } |
f9e14852 GB |
1390 | |
1391 | return 1; | |
cb08cc53 JK |
1392 | } |
1393 | ||
f9e14852 GB |
1394 | /* Read the full list of currently loaded shared objects directly |
1395 | from the inferior, without referring to any libraries read and | |
1396 | stored by the probes interface. Handle special cases relating | |
1397 | to the first elements of the list. */ | |
cb08cc53 JK |
1398 | |
1399 | static struct so_list * | |
f9e14852 | 1400 | svr4_current_sos_direct (struct svr4_info *info) |
cb08cc53 JK |
1401 | { |
1402 | CORE_ADDR lm; | |
1403 | struct so_list *head = NULL; | |
1404 | struct so_list **link_ptr = &head; | |
cb08cc53 JK |
1405 | struct cleanup *back_to; |
1406 | int ignore_first; | |
2268b414 JK |
1407 | struct svr4_library_list library_list; |
1408 | ||
0c5bf5a9 JK |
1409 | /* Fall back to manual examination of the target if the packet is not |
1410 | supported or gdbserver failed to find DT_DEBUG. gdb.server/solib-list.exp | |
1411 | tests a case where gdbserver cannot find the shared libraries list while | |
1412 | GDB itself is able to find it via SYMFILE_OBJFILE. | |
1413 | ||
1414 | Unfortunately statically linked inferiors will also fall back through this | |
1415 | suboptimal code path. */ | |
1416 | ||
f9e14852 GB |
1417 | info->using_xfer = svr4_current_sos_via_xfer_libraries (&library_list, |
1418 | NULL); | |
1419 | if (info->using_xfer) | |
2268b414 JK |
1420 | { |
1421 | if (library_list.main_lm) | |
f9e14852 | 1422 | info->main_lm_addr = library_list.main_lm; |
2268b414 JK |
1423 | |
1424 | return library_list.head ? library_list.head : svr4_default_sos (); | |
1425 | } | |
cb08cc53 | 1426 | |
cb08cc53 JK |
1427 | /* Always locate the debug struct, in case it has moved. */ |
1428 | info->debug_base = 0; | |
1429 | locate_base (info); | |
1430 | ||
1431 | /* If we can't find the dynamic linker's base structure, this | |
1432 | must not be a dynamically linked executable. Hmm. */ | |
1433 | if (! info->debug_base) | |
1434 | return svr4_default_sos (); | |
1435 | ||
1436 | /* Assume that everything is a library if the dynamic loader was loaded | |
1437 | late by a static executable. */ | |
1438 | if (exec_bfd && bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL) | |
1439 | ignore_first = 0; | |
1440 | else | |
1441 | ignore_first = 1; | |
1442 | ||
1443 | back_to = make_cleanup (svr4_free_library_list, &head); | |
1444 | ||
1445 | /* Walk the inferior's link map list, and build our list of | |
1446 | `struct so_list' nodes. */ | |
1447 | lm = solib_svr4_r_map (info); | |
1448 | if (lm) | |
f9e14852 | 1449 | svr4_read_so_list (lm, 0, &link_ptr, ignore_first); |
cb08cc53 JK |
1450 | |
1451 | /* On Solaris, the dynamic linker is not in the normal list of | |
1452 | shared objects, so make sure we pick it up too. Having | |
1453 | symbol information for the dynamic linker is quite crucial | |
1454 | for skipping dynamic linker resolver code. */ | |
1455 | lm = solib_svr4_r_ldsomap (info); | |
1456 | if (lm) | |
f9e14852 | 1457 | svr4_read_so_list (lm, 0, &link_ptr, 0); |
cb08cc53 JK |
1458 | |
1459 | discard_cleanups (back_to); | |
13437d4b | 1460 | |
34439770 DJ |
1461 | if (head == NULL) |
1462 | return svr4_default_sos (); | |
1463 | ||
13437d4b KB |
1464 | return head; |
1465 | } | |
1466 | ||
f9e14852 GB |
1467 | /* Implement the "current_sos" target_so_ops method. */ |
1468 | ||
1469 | static struct so_list * | |
1470 | svr4_current_sos (void) | |
1471 | { | |
1472 | struct svr4_info *info = get_svr4_info (); | |
1473 | ||
1474 | /* If the solib list has been read and stored by the probes | |
1475 | interface then we return a copy of the stored list. */ | |
1476 | if (info->solib_list != NULL) | |
1477 | return svr4_copy_library_list (info->solib_list); | |
1478 | ||
1479 | /* Otherwise obtain the solib list directly from the inferior. */ | |
1480 | return svr4_current_sos_direct (info); | |
1481 | } | |
1482 | ||
93a57060 | 1483 | /* Get the address of the link_map for a given OBJFILE. */ |
bc4a16ae EZ |
1484 | |
1485 | CORE_ADDR | |
1486 | svr4_fetch_objfile_link_map (struct objfile *objfile) | |
1487 | { | |
93a57060 | 1488 | struct so_list *so; |
6c95b8df | 1489 | struct svr4_info *info = get_svr4_info (); |
bc4a16ae | 1490 | |
93a57060 | 1491 | /* Cause svr4_current_sos() to be run if it hasn't been already. */ |
1a816a87 | 1492 | if (info->main_lm_addr == 0) |
93a57060 | 1493 | solib_add (NULL, 0, ¤t_target, auto_solib_add); |
bc4a16ae | 1494 | |
93a57060 DJ |
1495 | /* svr4_current_sos() will set main_lm_addr for the main executable. */ |
1496 | if (objfile == symfile_objfile) | |
1a816a87 | 1497 | return info->main_lm_addr; |
93a57060 DJ |
1498 | |
1499 | /* The other link map addresses may be found by examining the list | |
1500 | of shared libraries. */ | |
1501 | for (so = master_so_list (); so; so = so->next) | |
1502 | if (so->objfile == objfile) | |
1503 | return so->lm_info->lm_addr; | |
1504 | ||
1505 | /* Not found! */ | |
bc4a16ae EZ |
1506 | return 0; |
1507 | } | |
13437d4b KB |
1508 | |
1509 | /* On some systems, the only way to recognize the link map entry for | |
1510 | the main executable file is by looking at its name. Return | |
1511 | non-zero iff SONAME matches one of the known main executable names. */ | |
1512 | ||
1513 | static int | |
bc043ef3 | 1514 | match_main (const char *soname) |
13437d4b | 1515 | { |
bc043ef3 | 1516 | const char * const *mainp; |
13437d4b KB |
1517 | |
1518 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
1519 | { | |
1520 | if (strcmp (soname, *mainp) == 0) | |
1521 | return (1); | |
1522 | } | |
1523 | ||
1524 | return (0); | |
1525 | } | |
1526 | ||
13437d4b KB |
1527 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
1528 | SVR4 run time loader. */ | |
13437d4b | 1529 | |
7d522c90 | 1530 | int |
d7fa2ae2 | 1531 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) |
13437d4b | 1532 | { |
6c95b8df PA |
1533 | struct svr4_info *info = get_svr4_info (); |
1534 | ||
1535 | return ((pc >= info->interp_text_sect_low | |
1536 | && pc < info->interp_text_sect_high) | |
1537 | || (pc >= info->interp_plt_sect_low | |
1538 | && pc < info->interp_plt_sect_high) | |
3e5d3a5a | 1539 | || in_plt_section (pc) |
0875794a | 1540 | || in_gnu_ifunc_stub (pc)); |
13437d4b | 1541 | } |
13437d4b | 1542 | |
2f4950cd AC |
1543 | /* Given an executable's ABFD and target, compute the entry-point |
1544 | address. */ | |
1545 | ||
1546 | static CORE_ADDR | |
1547 | exec_entry_point (struct bfd *abfd, struct target_ops *targ) | |
1548 | { | |
8c2b9656 YQ |
1549 | CORE_ADDR addr; |
1550 | ||
2f4950cd AC |
1551 | /* KevinB wrote ... for most targets, the address returned by |
1552 | bfd_get_start_address() is the entry point for the start | |
1553 | function. But, for some targets, bfd_get_start_address() returns | |
1554 | the address of a function descriptor from which the entry point | |
1555 | address may be extracted. This address is extracted by | |
1556 | gdbarch_convert_from_func_ptr_addr(). The method | |
1557 | gdbarch_convert_from_func_ptr_addr() is the merely the identify | |
1558 | function for targets which don't use function descriptors. */ | |
8c2b9656 | 1559 | addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
2f4950cd AC |
1560 | bfd_get_start_address (abfd), |
1561 | targ); | |
8c2b9656 | 1562 | return gdbarch_addr_bits_remove (target_gdbarch (), addr); |
2f4950cd | 1563 | } |
13437d4b | 1564 | |
f9e14852 GB |
1565 | /* A probe and its associated action. */ |
1566 | ||
1567 | struct probe_and_action | |
1568 | { | |
1569 | /* The probe. */ | |
1570 | struct probe *probe; | |
1571 | ||
1572 | /* The action. */ | |
1573 | enum probe_action action; | |
1574 | }; | |
1575 | ||
1576 | /* Returns a hash code for the probe_and_action referenced by p. */ | |
1577 | ||
1578 | static hashval_t | |
1579 | hash_probe_and_action (const void *p) | |
1580 | { | |
1581 | const struct probe_and_action *pa = p; | |
1582 | ||
1583 | return (hashval_t) pa->probe->address; | |
1584 | } | |
1585 | ||
1586 | /* Returns non-zero if the probe_and_actions referenced by p1 and p2 | |
1587 | are equal. */ | |
1588 | ||
1589 | static int | |
1590 | equal_probe_and_action (const void *p1, const void *p2) | |
1591 | { | |
1592 | const struct probe_and_action *pa1 = p1; | |
1593 | const struct probe_and_action *pa2 = p2; | |
1594 | ||
1595 | return pa1->probe->address == pa2->probe->address; | |
1596 | } | |
1597 | ||
1598 | /* Register a solib event probe and its associated action in the | |
1599 | probes table. */ | |
1600 | ||
1601 | static void | |
1602 | register_solib_event_probe (struct probe *probe, enum probe_action action) | |
1603 | { | |
1604 | struct svr4_info *info = get_svr4_info (); | |
1605 | struct probe_and_action lookup, *pa; | |
1606 | void **slot; | |
1607 | ||
1608 | /* Create the probes table, if necessary. */ | |
1609 | if (info->probes_table == NULL) | |
1610 | info->probes_table = htab_create_alloc (1, hash_probe_and_action, | |
1611 | equal_probe_and_action, | |
1612 | xfree, xcalloc, xfree); | |
1613 | ||
1614 | lookup.probe = probe; | |
1615 | slot = htab_find_slot (info->probes_table, &lookup, INSERT); | |
1616 | gdb_assert (*slot == HTAB_EMPTY_ENTRY); | |
1617 | ||
1618 | pa = XCNEW (struct probe_and_action); | |
1619 | pa->probe = probe; | |
1620 | pa->action = action; | |
1621 | ||
1622 | *slot = pa; | |
1623 | } | |
1624 | ||
1625 | /* Get the solib event probe at the specified location, and the | |
1626 | action associated with it. Returns NULL if no solib event probe | |
1627 | was found. */ | |
1628 | ||
1629 | static struct probe_and_action * | |
1630 | solib_event_probe_at (struct svr4_info *info, CORE_ADDR address) | |
1631 | { | |
1632 | struct probe lookup_probe; | |
1633 | struct probe_and_action lookup; | |
1634 | void **slot; | |
1635 | ||
1636 | lookup_probe.address = address; | |
1637 | lookup.probe = &lookup_probe; | |
1638 | slot = htab_find_slot (info->probes_table, &lookup, NO_INSERT); | |
1639 | ||
1640 | if (slot == NULL) | |
1641 | return NULL; | |
1642 | ||
1643 | return (struct probe_and_action *) *slot; | |
1644 | } | |
1645 | ||
1646 | /* Decide what action to take when the specified solib event probe is | |
1647 | hit. */ | |
1648 | ||
1649 | static enum probe_action | |
1650 | solib_event_probe_action (struct probe_and_action *pa) | |
1651 | { | |
1652 | enum probe_action action; | |
1653 | unsigned probe_argc; | |
08a6411c | 1654 | struct frame_info *frame = get_current_frame (); |
f9e14852 GB |
1655 | |
1656 | action = pa->action; | |
1657 | if (action == DO_NOTHING || action == PROBES_INTERFACE_FAILED) | |
1658 | return action; | |
1659 | ||
1660 | gdb_assert (action == FULL_RELOAD || action == UPDATE_OR_RELOAD); | |
1661 | ||
1662 | /* Check that an appropriate number of arguments has been supplied. | |
1663 | We expect: | |
1664 | arg0: Lmid_t lmid (mandatory) | |
1665 | arg1: struct r_debug *debug_base (mandatory) | |
1666 | arg2: struct link_map *new (optional, for incremental updates) */ | |
08a6411c | 1667 | probe_argc = get_probe_argument_count (pa->probe, frame); |
f9e14852 GB |
1668 | if (probe_argc == 2) |
1669 | action = FULL_RELOAD; | |
1670 | else if (probe_argc < 2) | |
1671 | action = PROBES_INTERFACE_FAILED; | |
1672 | ||
1673 | return action; | |
1674 | } | |
1675 | ||
1676 | /* Populate the shared object list by reading the entire list of | |
1677 | shared objects from the inferior. Handle special cases relating | |
1678 | to the first elements of the list. Returns nonzero on success. */ | |
1679 | ||
1680 | static int | |
1681 | solist_update_full (struct svr4_info *info) | |
1682 | { | |
1683 | free_solib_list (info); | |
1684 | info->solib_list = svr4_current_sos_direct (info); | |
1685 | ||
1686 | return 1; | |
1687 | } | |
1688 | ||
1689 | /* Update the shared object list starting from the link-map entry | |
1690 | passed by the linker in the probe's third argument. Returns | |
1691 | nonzero if the list was successfully updated, or zero to indicate | |
1692 | failure. */ | |
1693 | ||
1694 | static int | |
1695 | solist_update_incremental (struct svr4_info *info, CORE_ADDR lm) | |
1696 | { | |
1697 | struct so_list *tail; | |
1698 | CORE_ADDR prev_lm; | |
1699 | ||
1700 | /* svr4_current_sos_direct contains logic to handle a number of | |
1701 | special cases relating to the first elements of the list. To | |
1702 | avoid duplicating this logic we defer to solist_update_full | |
1703 | if the list is empty. */ | |
1704 | if (info->solib_list == NULL) | |
1705 | return 0; | |
1706 | ||
1707 | /* Fall back to a full update if we are using a remote target | |
1708 | that does not support incremental transfers. */ | |
1709 | if (info->using_xfer && !target_augmented_libraries_svr4_read ()) | |
1710 | return 0; | |
1711 | ||
1712 | /* Walk to the end of the list. */ | |
1713 | for (tail = info->solib_list; tail->next != NULL; tail = tail->next) | |
1714 | /* Nothing. */; | |
1715 | prev_lm = tail->lm_info->lm_addr; | |
1716 | ||
1717 | /* Read the new objects. */ | |
1718 | if (info->using_xfer) | |
1719 | { | |
1720 | struct svr4_library_list library_list; | |
1721 | char annex[64]; | |
1722 | ||
1723 | xsnprintf (annex, sizeof (annex), "start=%s;prev=%s", | |
1724 | phex_nz (lm, sizeof (lm)), | |
1725 | phex_nz (prev_lm, sizeof (prev_lm))); | |
1726 | if (!svr4_current_sos_via_xfer_libraries (&library_list, annex)) | |
1727 | return 0; | |
1728 | ||
1729 | tail->next = library_list.head; | |
1730 | } | |
1731 | else | |
1732 | { | |
1733 | struct so_list **link = &tail->next; | |
1734 | ||
1735 | /* IGNORE_FIRST may safely be set to zero here because the | |
1736 | above check and deferral to solist_update_full ensures | |
1737 | that this call to svr4_read_so_list will never see the | |
1738 | first element. */ | |
1739 | if (!svr4_read_so_list (lm, prev_lm, &link, 0)) | |
1740 | return 0; | |
1741 | } | |
1742 | ||
1743 | return 1; | |
1744 | } | |
1745 | ||
1746 | /* Disable the probes-based linker interface and revert to the | |
1747 | original interface. We don't reset the breakpoints as the | |
1748 | ones set up for the probes-based interface are adequate. */ | |
1749 | ||
1750 | static void | |
1751 | disable_probes_interface_cleanup (void *arg) | |
1752 | { | |
1753 | struct svr4_info *info = get_svr4_info (); | |
1754 | ||
1755 | warning (_("Probes-based dynamic linker interface failed.\n" | |
1756 | "Reverting to original interface.\n")); | |
1757 | ||
1758 | free_probes_table (info); | |
1759 | free_solib_list (info); | |
1760 | } | |
1761 | ||
1762 | /* Update the solib list as appropriate when using the | |
1763 | probes-based linker interface. Do nothing if using the | |
1764 | standard interface. */ | |
1765 | ||
1766 | static void | |
1767 | svr4_handle_solib_event (void) | |
1768 | { | |
1769 | struct svr4_info *info = get_svr4_info (); | |
1770 | struct probe_and_action *pa; | |
1771 | enum probe_action action; | |
1772 | struct cleanup *old_chain, *usm_chain; | |
1773 | struct value *val; | |
1774 | CORE_ADDR pc, debug_base, lm = 0; | |
1775 | int is_initial_ns; | |
08a6411c | 1776 | struct frame_info *frame = get_current_frame (); |
f9e14852 GB |
1777 | |
1778 | /* Do nothing if not using the probes interface. */ | |
1779 | if (info->probes_table == NULL) | |
1780 | return; | |
1781 | ||
1782 | /* If anything goes wrong we revert to the original linker | |
1783 | interface. */ | |
1784 | old_chain = make_cleanup (disable_probes_interface_cleanup, NULL); | |
1785 | ||
1786 | pc = regcache_read_pc (get_current_regcache ()); | |
1787 | pa = solib_event_probe_at (info, pc); | |
1788 | if (pa == NULL) | |
1789 | { | |
1790 | do_cleanups (old_chain); | |
1791 | return; | |
1792 | } | |
1793 | ||
1794 | action = solib_event_probe_action (pa); | |
1795 | if (action == PROBES_INTERFACE_FAILED) | |
1796 | { | |
1797 | do_cleanups (old_chain); | |
1798 | return; | |
1799 | } | |
1800 | ||
1801 | if (action == DO_NOTHING) | |
1802 | { | |
1803 | discard_cleanups (old_chain); | |
1804 | return; | |
1805 | } | |
1806 | ||
1807 | /* evaluate_probe_argument looks up symbols in the dynamic linker | |
1808 | using find_pc_section. find_pc_section is accelerated by a cache | |
1809 | called the section map. The section map is invalidated every | |
1810 | time a shared library is loaded or unloaded, and if the inferior | |
1811 | is generating a lot of shared library events then the section map | |
1812 | will be updated every time svr4_handle_solib_event is called. | |
1813 | We called find_pc_section in svr4_create_solib_event_breakpoints, | |
1814 | so we can guarantee that the dynamic linker's sections are in the | |
1815 | section map. We can therefore inhibit section map updates across | |
1816 | these calls to evaluate_probe_argument and save a lot of time. */ | |
1817 | inhibit_section_map_updates (current_program_space); | |
1818 | usm_chain = make_cleanup (resume_section_map_updates_cleanup, | |
1819 | current_program_space); | |
1820 | ||
08a6411c | 1821 | val = evaluate_probe_argument (pa->probe, 1, frame); |
f9e14852 GB |
1822 | if (val == NULL) |
1823 | { | |
1824 | do_cleanups (old_chain); | |
1825 | return; | |
1826 | } | |
1827 | ||
1828 | debug_base = value_as_address (val); | |
1829 | if (debug_base == 0) | |
1830 | { | |
1831 | do_cleanups (old_chain); | |
1832 | return; | |
1833 | } | |
1834 | ||
1835 | /* Always locate the debug struct, in case it moved. */ | |
1836 | info->debug_base = 0; | |
1837 | if (locate_base (info) == 0) | |
1838 | { | |
1839 | do_cleanups (old_chain); | |
1840 | return; | |
1841 | } | |
1842 | ||
1843 | /* GDB does not currently support libraries loaded via dlmopen | |
1844 | into namespaces other than the initial one. We must ignore | |
1845 | any namespace other than the initial namespace here until | |
1846 | support for this is added to GDB. */ | |
1847 | if (debug_base != info->debug_base) | |
1848 | action = DO_NOTHING; | |
1849 | ||
1850 | if (action == UPDATE_OR_RELOAD) | |
1851 | { | |
08a6411c | 1852 | val = evaluate_probe_argument (pa->probe, 2, frame); |
f9e14852 GB |
1853 | if (val != NULL) |
1854 | lm = value_as_address (val); | |
1855 | ||
1856 | if (lm == 0) | |
1857 | action = FULL_RELOAD; | |
1858 | } | |
1859 | ||
1860 | /* Resume section map updates. */ | |
1861 | do_cleanups (usm_chain); | |
1862 | ||
1863 | if (action == UPDATE_OR_RELOAD) | |
1864 | { | |
1865 | if (!solist_update_incremental (info, lm)) | |
1866 | action = FULL_RELOAD; | |
1867 | } | |
1868 | ||
1869 | if (action == FULL_RELOAD) | |
1870 | { | |
1871 | if (!solist_update_full (info)) | |
1872 | { | |
1873 | do_cleanups (old_chain); | |
1874 | return; | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | discard_cleanups (old_chain); | |
1879 | } | |
1880 | ||
1881 | /* Helper function for svr4_update_solib_event_breakpoints. */ | |
1882 | ||
1883 | static int | |
1884 | svr4_update_solib_event_breakpoint (struct breakpoint *b, void *arg) | |
1885 | { | |
1886 | struct bp_location *loc; | |
1887 | ||
1888 | if (b->type != bp_shlib_event) | |
1889 | { | |
1890 | /* Continue iterating. */ | |
1891 | return 0; | |
1892 | } | |
1893 | ||
1894 | for (loc = b->loc; loc != NULL; loc = loc->next) | |
1895 | { | |
1896 | struct svr4_info *info; | |
1897 | struct probe_and_action *pa; | |
1898 | ||
1899 | info = program_space_data (loc->pspace, solib_svr4_pspace_data); | |
1900 | if (info == NULL || info->probes_table == NULL) | |
1901 | continue; | |
1902 | ||
1903 | pa = solib_event_probe_at (info, loc->address); | |
1904 | if (pa == NULL) | |
1905 | continue; | |
1906 | ||
1907 | if (pa->action == DO_NOTHING) | |
1908 | { | |
1909 | if (b->enable_state == bp_disabled && stop_on_solib_events) | |
1910 | enable_breakpoint (b); | |
1911 | else if (b->enable_state == bp_enabled && !stop_on_solib_events) | |
1912 | disable_breakpoint (b); | |
1913 | } | |
1914 | ||
1915 | break; | |
1916 | } | |
1917 | ||
1918 | /* Continue iterating. */ | |
1919 | return 0; | |
1920 | } | |
1921 | ||
1922 | /* Enable or disable optional solib event breakpoints as appropriate. | |
1923 | Called whenever stop_on_solib_events is changed. */ | |
1924 | ||
1925 | static void | |
1926 | svr4_update_solib_event_breakpoints (void) | |
1927 | { | |
1928 | iterate_over_breakpoints (svr4_update_solib_event_breakpoint, NULL); | |
1929 | } | |
1930 | ||
1931 | /* Create and register solib event breakpoints. PROBES is an array | |
1932 | of NUM_PROBES elements, each of which is vector of probes. A | |
1933 | solib event breakpoint will be created and registered for each | |
1934 | probe. */ | |
1935 | ||
1936 | static void | |
1937 | svr4_create_probe_breakpoints (struct gdbarch *gdbarch, | |
1938 | VEC (probe_p) **probes) | |
1939 | { | |
1940 | int i; | |
1941 | ||
1942 | for (i = 0; i < NUM_PROBES; i++) | |
1943 | { | |
1944 | enum probe_action action = probe_info[i].action; | |
1945 | struct probe *probe; | |
1946 | int ix; | |
1947 | ||
1948 | for (ix = 0; | |
1949 | VEC_iterate (probe_p, probes[i], ix, probe); | |
1950 | ++ix) | |
1951 | { | |
1952 | create_solib_event_breakpoint (gdbarch, probe->address); | |
1953 | register_solib_event_probe (probe, action); | |
1954 | } | |
1955 | } | |
1956 | ||
1957 | svr4_update_solib_event_breakpoints (); | |
1958 | } | |
1959 | ||
1960 | /* Both the SunOS and the SVR4 dynamic linkers call a marker function | |
1961 | before and after mapping and unmapping shared libraries. The sole | |
1962 | purpose of this method is to allow debuggers to set a breakpoint so | |
1963 | they can track these changes. | |
1964 | ||
1965 | Some versions of the glibc dynamic linker contain named probes | |
1966 | to allow more fine grained stopping. Given the address of the | |
1967 | original marker function, this function attempts to find these | |
1968 | probes, and if found, sets breakpoints on those instead. If the | |
1969 | probes aren't found, a single breakpoint is set on the original | |
1970 | marker function. */ | |
1971 | ||
1972 | static void | |
1973 | svr4_create_solib_event_breakpoints (struct gdbarch *gdbarch, | |
1974 | CORE_ADDR address) | |
1975 | { | |
1976 | struct obj_section *os; | |
1977 | ||
1978 | os = find_pc_section (address); | |
1979 | if (os != NULL) | |
1980 | { | |
1981 | int with_prefix; | |
1982 | ||
1983 | for (with_prefix = 0; with_prefix <= 1; with_prefix++) | |
1984 | { | |
1985 | VEC (probe_p) *probes[NUM_PROBES]; | |
1986 | int all_probes_found = 1; | |
25f9533e | 1987 | int checked_can_use_probe_arguments = 0; |
f9e14852 GB |
1988 | int i; |
1989 | ||
1990 | memset (probes, 0, sizeof (probes)); | |
1991 | for (i = 0; i < NUM_PROBES; i++) | |
1992 | { | |
1993 | const char *name = probe_info[i].name; | |
25f9533e | 1994 | struct probe *p; |
f9e14852 GB |
1995 | char buf[32]; |
1996 | ||
1997 | /* Fedora 17 and Red Hat Enterprise Linux 6.2-6.4 | |
1998 | shipped with an early version of the probes code in | |
1999 | which the probes' names were prefixed with "rtld_" | |
2000 | and the "map_failed" probe did not exist. The | |
2001 | locations of the probes are otherwise the same, so | |
2002 | we check for probes with prefixed names if probes | |
2003 | with unprefixed names are not present. */ | |
2004 | if (with_prefix) | |
2005 | { | |
2006 | xsnprintf (buf, sizeof (buf), "rtld_%s", name); | |
2007 | name = buf; | |
2008 | } | |
2009 | ||
2010 | probes[i] = find_probes_in_objfile (os->objfile, "rtld", name); | |
2011 | ||
2012 | /* The "map_failed" probe did not exist in early | |
2013 | versions of the probes code in which the probes' | |
2014 | names were prefixed with "rtld_". */ | |
2015 | if (strcmp (name, "rtld_map_failed") == 0) | |
2016 | continue; | |
2017 | ||
2018 | if (VEC_empty (probe_p, probes[i])) | |
2019 | { | |
2020 | all_probes_found = 0; | |
2021 | break; | |
2022 | } | |
25f9533e SDJ |
2023 | |
2024 | /* Ensure probe arguments can be evaluated. */ | |
2025 | if (!checked_can_use_probe_arguments) | |
2026 | { | |
2027 | p = VEC_index (probe_p, probes[i], 0); | |
2028 | if (!can_evaluate_probe_arguments (p)) | |
2029 | { | |
2030 | all_probes_found = 0; | |
2031 | break; | |
2032 | } | |
2033 | checked_can_use_probe_arguments = 1; | |
2034 | } | |
f9e14852 GB |
2035 | } |
2036 | ||
2037 | if (all_probes_found) | |
2038 | svr4_create_probe_breakpoints (gdbarch, probes); | |
2039 | ||
2040 | for (i = 0; i < NUM_PROBES; i++) | |
2041 | VEC_free (probe_p, probes[i]); | |
2042 | ||
2043 | if (all_probes_found) | |
2044 | return; | |
2045 | } | |
2046 | } | |
2047 | ||
2048 | create_solib_event_breakpoint (gdbarch, address); | |
2049 | } | |
2050 | ||
cb457ae2 YQ |
2051 | /* Helper function for gdb_bfd_lookup_symbol. */ |
2052 | ||
2053 | static int | |
2054 | cmp_name_and_sec_flags (asymbol *sym, void *data) | |
2055 | { | |
2056 | return (strcmp (sym->name, (const char *) data) == 0 | |
2057 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0); | |
2058 | } | |
7f86f058 | 2059 | /* Arrange for dynamic linker to hit breakpoint. |
13437d4b KB |
2060 | |
2061 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
2062 | debugger interface, support for arranging for the inferior to hit | |
2063 | a breakpoint after mapping in the shared libraries. This function | |
2064 | enables that breakpoint. | |
2065 | ||
2066 | For SunOS, there is a special flag location (in_debugger) which we | |
2067 | set to 1. When the dynamic linker sees this flag set, it will set | |
2068 | a breakpoint at a location known only to itself, after saving the | |
2069 | original contents of that place and the breakpoint address itself, | |
2070 | in it's own internal structures. When we resume the inferior, it | |
2071 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
2072 | We handle this (in a different place) by restoring the contents of | |
2073 | the breakpointed location (which is only known after it stops), | |
2074 | chasing around to locate the shared libraries that have been | |
2075 | loaded, then resuming. | |
2076 | ||
2077 | For SVR4, the debugger interface structure contains a member (r_brk) | |
2078 | which is statically initialized at the time the shared library is | |
2079 | built, to the offset of a function (_r_debug_state) which is guaran- | |
2080 | teed to be called once before mapping in a library, and again when | |
2081 | the mapping is complete. At the time we are examining this member, | |
2082 | it contains only the unrelocated offset of the function, so we have | |
2083 | to do our own relocation. Later, when the dynamic linker actually | |
2084 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
2085 | ||
2086 | The debugger interface structure also contains an enumeration which | |
2087 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
2088 | depending upon whether or not the library is being mapped or unmapped, | |
7f86f058 | 2089 | and then set to RT_CONSISTENT after the library is mapped/unmapped. */ |
13437d4b KB |
2090 | |
2091 | static int | |
268a4a75 | 2092 | enable_break (struct svr4_info *info, int from_tty) |
13437d4b | 2093 | { |
13437d4b | 2094 | struct minimal_symbol *msymbol; |
bc043ef3 | 2095 | const char * const *bkpt_namep; |
13437d4b | 2096 | asection *interp_sect; |
001f13d8 | 2097 | char *interp_name; |
7cd25cfc | 2098 | CORE_ADDR sym_addr; |
13437d4b | 2099 | |
6c95b8df PA |
2100 | info->interp_text_sect_low = info->interp_text_sect_high = 0; |
2101 | info->interp_plt_sect_low = info->interp_plt_sect_high = 0; | |
13437d4b | 2102 | |
7cd25cfc DJ |
2103 | /* If we already have a shared library list in the target, and |
2104 | r_debug contains r_brk, set the breakpoint there - this should | |
2105 | mean r_brk has already been relocated. Assume the dynamic linker | |
2106 | is the object containing r_brk. */ | |
2107 | ||
268a4a75 | 2108 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
7cd25cfc | 2109 | sym_addr = 0; |
1a816a87 PA |
2110 | if (info->debug_base && solib_svr4_r_map (info) != 0) |
2111 | sym_addr = solib_svr4_r_brk (info); | |
7cd25cfc DJ |
2112 | |
2113 | if (sym_addr != 0) | |
2114 | { | |
2115 | struct obj_section *os; | |
2116 | ||
b36ec657 | 2117 | sym_addr = gdbarch_addr_bits_remove |
f5656ead | 2118 | (target_gdbarch (), gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
3e43a32a MS |
2119 | sym_addr, |
2120 | ¤t_target)); | |
b36ec657 | 2121 | |
48379de6 DE |
2122 | /* On at least some versions of Solaris there's a dynamic relocation |
2123 | on _r_debug.r_brk and SYM_ADDR may not be relocated yet, e.g., if | |
2124 | we get control before the dynamic linker has self-relocated. | |
2125 | Check if SYM_ADDR is in a known section, if it is assume we can | |
2126 | trust its value. This is just a heuristic though, it could go away | |
2127 | or be replaced if it's getting in the way. | |
2128 | ||
2129 | On ARM we need to know whether the ISA of rtld_db_dlactivity (or | |
2130 | however it's spelled in your particular system) is ARM or Thumb. | |
2131 | That knowledge is encoded in the address, if it's Thumb the low bit | |
2132 | is 1. However, we've stripped that info above and it's not clear | |
2133 | what all the consequences are of passing a non-addr_bits_remove'd | |
f9e14852 | 2134 | address to svr4_create_solib_event_breakpoints. The call to |
48379de6 DE |
2135 | find_pc_section verifies we know about the address and have some |
2136 | hope of computing the right kind of breakpoint to use (via | |
2137 | symbol info). It does mean that GDB needs to be pointed at a | |
2138 | non-stripped version of the dynamic linker in order to obtain | |
2139 | information it already knows about. Sigh. */ | |
2140 | ||
7cd25cfc DJ |
2141 | os = find_pc_section (sym_addr); |
2142 | if (os != NULL) | |
2143 | { | |
2144 | /* Record the relocated start and end address of the dynamic linker | |
2145 | text and plt section for svr4_in_dynsym_resolve_code. */ | |
2146 | bfd *tmp_bfd; | |
2147 | CORE_ADDR load_addr; | |
2148 | ||
2149 | tmp_bfd = os->objfile->obfd; | |
2150 | load_addr = ANOFFSET (os->objfile->section_offsets, | |
e03e6279 | 2151 | SECT_OFF_TEXT (os->objfile)); |
7cd25cfc DJ |
2152 | |
2153 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
2154 | if (interp_sect) | |
2155 | { | |
6c95b8df | 2156 | info->interp_text_sect_low = |
7cd25cfc | 2157 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
2158 | info->interp_text_sect_high = |
2159 | info->interp_text_sect_low | |
2160 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
2161 | } |
2162 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
2163 | if (interp_sect) | |
2164 | { | |
6c95b8df | 2165 | info->interp_plt_sect_low = |
7cd25cfc | 2166 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
2167 | info->interp_plt_sect_high = |
2168 | info->interp_plt_sect_low | |
2169 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
2170 | } |
2171 | ||
f9e14852 | 2172 | svr4_create_solib_event_breakpoints (target_gdbarch (), sym_addr); |
7cd25cfc DJ |
2173 | return 1; |
2174 | } | |
2175 | } | |
2176 | ||
97ec2c2f | 2177 | /* Find the program interpreter; if not found, warn the user and drop |
13437d4b | 2178 | into the old breakpoint at symbol code. */ |
97ec2c2f UW |
2179 | interp_name = find_program_interpreter (); |
2180 | if (interp_name) | |
13437d4b | 2181 | { |
8ad2fcde KB |
2182 | CORE_ADDR load_addr = 0; |
2183 | int load_addr_found = 0; | |
2ec9a4f8 | 2184 | int loader_found_in_list = 0; |
f8766ec1 | 2185 | struct so_list *so; |
e4f7b8c8 | 2186 | bfd *tmp_bfd = NULL; |
2f4950cd | 2187 | struct target_ops *tmp_bfd_target; |
f1838a98 | 2188 | volatile struct gdb_exception ex; |
13437d4b | 2189 | |
7cd25cfc | 2190 | sym_addr = 0; |
13437d4b KB |
2191 | |
2192 | /* Now we need to figure out where the dynamic linker was | |
2193 | loaded so that we can load its symbols and place a breakpoint | |
2194 | in the dynamic linker itself. | |
2195 | ||
2196 | This address is stored on the stack. However, I've been unable | |
2197 | to find any magic formula to find it for Solaris (appears to | |
2198 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
2199 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 | 2200 | |
f1838a98 UW |
2201 | TRY_CATCH (ex, RETURN_MASK_ALL) |
2202 | { | |
97ec2c2f | 2203 | tmp_bfd = solib_bfd_open (interp_name); |
f1838a98 | 2204 | } |
13437d4b KB |
2205 | if (tmp_bfd == NULL) |
2206 | goto bkpt_at_symbol; | |
2207 | ||
2f4950cd | 2208 | /* Now convert the TMP_BFD into a target. That way target, as |
695c3173 | 2209 | well as BFD operations can be used. */ |
2f4950cd | 2210 | tmp_bfd_target = target_bfd_reopen (tmp_bfd); |
695c3173 TT |
2211 | /* target_bfd_reopen acquired its own reference, so we can |
2212 | release ours now. */ | |
2213 | gdb_bfd_unref (tmp_bfd); | |
2f4950cd | 2214 | |
f8766ec1 KB |
2215 | /* On a running target, we can get the dynamic linker's base |
2216 | address from the shared library table. */ | |
f8766ec1 KB |
2217 | so = master_so_list (); |
2218 | while (so) | |
8ad2fcde | 2219 | { |
97ec2c2f | 2220 | if (svr4_same_1 (interp_name, so->so_original_name)) |
8ad2fcde KB |
2221 | { |
2222 | load_addr_found = 1; | |
2ec9a4f8 | 2223 | loader_found_in_list = 1; |
b23518f0 | 2224 | load_addr = lm_addr_check (so, tmp_bfd); |
8ad2fcde KB |
2225 | break; |
2226 | } | |
f8766ec1 | 2227 | so = so->next; |
8ad2fcde KB |
2228 | } |
2229 | ||
8d4e36ba JB |
2230 | /* If we were not able to find the base address of the loader |
2231 | from our so_list, then try using the AT_BASE auxilliary entry. */ | |
2232 | if (!load_addr_found) | |
2233 | if (target_auxv_search (¤t_target, AT_BASE, &load_addr) > 0) | |
ad3a0e5b | 2234 | { |
f5656ead | 2235 | int addr_bit = gdbarch_addr_bit (target_gdbarch ()); |
ad3a0e5b JK |
2236 | |
2237 | /* Ensure LOAD_ADDR has proper sign in its possible upper bits so | |
2238 | that `+ load_addr' will overflow CORE_ADDR width not creating | |
2239 | invalid addresses like 0x101234567 for 32bit inferiors on 64bit | |
2240 | GDB. */ | |
2241 | ||
d182d057 | 2242 | if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT)) |
ad3a0e5b | 2243 | { |
d182d057 | 2244 | CORE_ADDR space_size = (CORE_ADDR) 1 << addr_bit; |
ad3a0e5b JK |
2245 | CORE_ADDR tmp_entry_point = exec_entry_point (tmp_bfd, |
2246 | tmp_bfd_target); | |
2247 | ||
2248 | gdb_assert (load_addr < space_size); | |
2249 | ||
2250 | /* TMP_ENTRY_POINT exceeding SPACE_SIZE would be for prelinked | |
2251 | 64bit ld.so with 32bit executable, it should not happen. */ | |
2252 | ||
2253 | if (tmp_entry_point < space_size | |
2254 | && tmp_entry_point + load_addr >= space_size) | |
2255 | load_addr -= space_size; | |
2256 | } | |
2257 | ||
2258 | load_addr_found = 1; | |
2259 | } | |
8d4e36ba | 2260 | |
8ad2fcde KB |
2261 | /* Otherwise we find the dynamic linker's base address by examining |
2262 | the current pc (which should point at the entry point for the | |
8d4e36ba JB |
2263 | dynamic linker) and subtracting the offset of the entry point. |
2264 | ||
2265 | This is more fragile than the previous approaches, but is a good | |
2266 | fallback method because it has actually been working well in | |
2267 | most cases. */ | |
8ad2fcde | 2268 | if (!load_addr_found) |
fb14de7b | 2269 | { |
c2250ad1 | 2270 | struct regcache *regcache |
f5656ead | 2271 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch ()); |
433759f7 | 2272 | |
fb14de7b UW |
2273 | load_addr = (regcache_read_pc (regcache) |
2274 | - exec_entry_point (tmp_bfd, tmp_bfd_target)); | |
2275 | } | |
2ec9a4f8 DJ |
2276 | |
2277 | if (!loader_found_in_list) | |
34439770 | 2278 | { |
1a816a87 PA |
2279 | info->debug_loader_name = xstrdup (interp_name); |
2280 | info->debug_loader_offset_p = 1; | |
2281 | info->debug_loader_offset = load_addr; | |
268a4a75 | 2282 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
34439770 | 2283 | } |
13437d4b KB |
2284 | |
2285 | /* Record the relocated start and end address of the dynamic linker | |
d7fa2ae2 | 2286 | text and plt section for svr4_in_dynsym_resolve_code. */ |
13437d4b KB |
2287 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
2288 | if (interp_sect) | |
2289 | { | |
6c95b8df | 2290 | info->interp_text_sect_low = |
13437d4b | 2291 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
2292 | info->interp_text_sect_high = |
2293 | info->interp_text_sect_low | |
2294 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
2295 | } |
2296 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
2297 | if (interp_sect) | |
2298 | { | |
6c95b8df | 2299 | info->interp_plt_sect_low = |
13437d4b | 2300 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
2301 | info->interp_plt_sect_high = |
2302 | info->interp_plt_sect_low | |
2303 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
2304 | } |
2305 | ||
2306 | /* Now try to set a breakpoint in the dynamic linker. */ | |
2307 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
2308 | { | |
cb457ae2 YQ |
2309 | sym_addr = gdb_bfd_lookup_symbol (tmp_bfd, cmp_name_and_sec_flags, |
2310 | (void *) *bkpt_namep); | |
13437d4b KB |
2311 | if (sym_addr != 0) |
2312 | break; | |
2313 | } | |
2314 | ||
2bbe3cc1 DJ |
2315 | if (sym_addr != 0) |
2316 | /* Convert 'sym_addr' from a function pointer to an address. | |
2317 | Because we pass tmp_bfd_target instead of the current | |
2318 | target, this will always produce an unrelocated value. */ | |
f5656ead | 2319 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
2bbe3cc1 DJ |
2320 | sym_addr, |
2321 | tmp_bfd_target); | |
2322 | ||
695c3173 TT |
2323 | /* We're done with both the temporary bfd and target. Closing |
2324 | the target closes the underlying bfd, because it holds the | |
2325 | only remaining reference. */ | |
460014f5 | 2326 | target_close (tmp_bfd_target); |
13437d4b KB |
2327 | |
2328 | if (sym_addr != 0) | |
2329 | { | |
f9e14852 GB |
2330 | svr4_create_solib_event_breakpoints (target_gdbarch (), |
2331 | load_addr + sym_addr); | |
97ec2c2f | 2332 | xfree (interp_name); |
13437d4b KB |
2333 | return 1; |
2334 | } | |
2335 | ||
2336 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
2337 | linker. Warn and drop into the old code. */ | |
2338 | bkpt_at_symbol: | |
97ec2c2f | 2339 | xfree (interp_name); |
82d03102 PG |
2340 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
2341 | "GDB will be unable to debug shared library initializers\n" | |
2342 | "and track explicitly loaded dynamic code.")); | |
13437d4b | 2343 | } |
13437d4b | 2344 | |
e499d0f1 DJ |
2345 | /* Scan through the lists of symbols, trying to look up the symbol and |
2346 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
2347 | ||
2348 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
2349 | { | |
2350 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
2351 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
2352 | { | |
de64a9ac | 2353 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
f5656ead | 2354 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
de64a9ac JM |
2355 | sym_addr, |
2356 | ¤t_target); | |
f9e14852 | 2357 | svr4_create_solib_event_breakpoints (target_gdbarch (), sym_addr); |
e499d0f1 DJ |
2358 | return 1; |
2359 | } | |
2360 | } | |
13437d4b | 2361 | |
fb139f32 | 2362 | if (interp_name != NULL && !current_inferior ()->attach_flag) |
13437d4b | 2363 | { |
c6490bf2 | 2364 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) |
13437d4b | 2365 | { |
c6490bf2 KB |
2366 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); |
2367 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
2368 | { | |
2369 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
f5656ead | 2370 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
c6490bf2 KB |
2371 | sym_addr, |
2372 | ¤t_target); | |
f9e14852 | 2373 | svr4_create_solib_event_breakpoints (target_gdbarch (), sym_addr); |
c6490bf2 KB |
2374 | return 1; |
2375 | } | |
13437d4b KB |
2376 | } |
2377 | } | |
542c95c2 | 2378 | return 0; |
13437d4b KB |
2379 | } |
2380 | ||
7f86f058 | 2381 | /* Implement the "special_symbol_handling" target_so_ops method. */ |
13437d4b KB |
2382 | |
2383 | static void | |
2384 | svr4_special_symbol_handling (void) | |
2385 | { | |
7f86f058 | 2386 | /* Nothing to do. */ |
13437d4b KB |
2387 | } |
2388 | ||
09919ac2 JK |
2389 | /* Read the ELF program headers from ABFD. Return the contents and |
2390 | set *PHDRS_SIZE to the size of the program headers. */ | |
e2a44558 | 2391 | |
09919ac2 JK |
2392 | static gdb_byte * |
2393 | read_program_headers_from_bfd (bfd *abfd, int *phdrs_size) | |
e2a44558 | 2394 | { |
09919ac2 JK |
2395 | Elf_Internal_Ehdr *ehdr; |
2396 | gdb_byte *buf; | |
e2a44558 | 2397 | |
09919ac2 | 2398 | ehdr = elf_elfheader (abfd); |
b8040f19 | 2399 | |
09919ac2 JK |
2400 | *phdrs_size = ehdr->e_phnum * ehdr->e_phentsize; |
2401 | if (*phdrs_size == 0) | |
2402 | return NULL; | |
2403 | ||
2404 | buf = xmalloc (*phdrs_size); | |
2405 | if (bfd_seek (abfd, ehdr->e_phoff, SEEK_SET) != 0 | |
2406 | || bfd_bread (buf, *phdrs_size, abfd) != *phdrs_size) | |
2407 | { | |
2408 | xfree (buf); | |
2409 | return NULL; | |
2410 | } | |
2411 | ||
2412 | return buf; | |
b8040f19 JK |
2413 | } |
2414 | ||
01c30d6e JK |
2415 | /* Return 1 and fill *DISPLACEMENTP with detected PIE offset of inferior |
2416 | exec_bfd. Otherwise return 0. | |
2417 | ||
2418 | We relocate all of the sections by the same amount. This | |
c378eb4e | 2419 | behavior is mandated by recent editions of the System V ABI. |
b8040f19 JK |
2420 | According to the System V Application Binary Interface, |
2421 | Edition 4.1, page 5-5: | |
2422 | ||
2423 | ... Though the system chooses virtual addresses for | |
2424 | individual processes, it maintains the segments' relative | |
2425 | positions. Because position-independent code uses relative | |
2426 | addressesing between segments, the difference between | |
2427 | virtual addresses in memory must match the difference | |
2428 | between virtual addresses in the file. The difference | |
2429 | between the virtual address of any segment in memory and | |
2430 | the corresponding virtual address in the file is thus a | |
2431 | single constant value for any one executable or shared | |
2432 | object in a given process. This difference is the base | |
2433 | address. One use of the base address is to relocate the | |
2434 | memory image of the program during dynamic linking. | |
2435 | ||
2436 | The same language also appears in Edition 4.0 of the System V | |
09919ac2 JK |
2437 | ABI and is left unspecified in some of the earlier editions. |
2438 | ||
2439 | Decide if the objfile needs to be relocated. As indicated above, we will | |
2440 | only be here when execution is stopped. But during attachment PC can be at | |
2441 | arbitrary address therefore regcache_read_pc can be misleading (contrary to | |
2442 | the auxv AT_ENTRY value). Moreover for executable with interpreter section | |
2443 | regcache_read_pc would point to the interpreter and not the main executable. | |
2444 | ||
2445 | So, to summarize, relocations are necessary when the start address obtained | |
2446 | from the executable is different from the address in auxv AT_ENTRY entry. | |
d989b283 | 2447 | |
09919ac2 JK |
2448 | [ The astute reader will note that we also test to make sure that |
2449 | the executable in question has the DYNAMIC flag set. It is my | |
2450 | opinion that this test is unnecessary (undesirable even). It | |
2451 | was added to avoid inadvertent relocation of an executable | |
2452 | whose e_type member in the ELF header is not ET_DYN. There may | |
2453 | be a time in the future when it is desirable to do relocations | |
2454 | on other types of files as well in which case this condition | |
2455 | should either be removed or modified to accomodate the new file | |
2456 | type. - Kevin, Nov 2000. ] */ | |
b8040f19 | 2457 | |
01c30d6e JK |
2458 | static int |
2459 | svr4_exec_displacement (CORE_ADDR *displacementp) | |
b8040f19 | 2460 | { |
41752192 JK |
2461 | /* ENTRY_POINT is a possible function descriptor - before |
2462 | a call to gdbarch_convert_from_func_ptr_addr. */ | |
09919ac2 | 2463 | CORE_ADDR entry_point, displacement; |
b8040f19 JK |
2464 | |
2465 | if (exec_bfd == NULL) | |
2466 | return 0; | |
2467 | ||
09919ac2 JK |
2468 | /* Therefore for ELF it is ET_EXEC and not ET_DYN. Both shared libraries |
2469 | being executed themselves and PIE (Position Independent Executable) | |
2470 | executables are ET_DYN. */ | |
2471 | ||
2472 | if ((bfd_get_file_flags (exec_bfd) & DYNAMIC) == 0) | |
2473 | return 0; | |
2474 | ||
2475 | if (target_auxv_search (¤t_target, AT_ENTRY, &entry_point) <= 0) | |
2476 | return 0; | |
2477 | ||
2478 | displacement = entry_point - bfd_get_start_address (exec_bfd); | |
2479 | ||
2480 | /* Verify the DISPLACEMENT candidate complies with the required page | |
2481 | alignment. It is cheaper than the program headers comparison below. */ | |
2482 | ||
2483 | if (bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
2484 | { | |
2485 | const struct elf_backend_data *elf = get_elf_backend_data (exec_bfd); | |
2486 | ||
2487 | /* p_align of PT_LOAD segments does not specify any alignment but | |
2488 | only congruency of addresses: | |
2489 | p_offset % p_align == p_vaddr % p_align | |
2490 | Kernel is free to load the executable with lower alignment. */ | |
2491 | ||
2492 | if ((displacement & (elf->minpagesize - 1)) != 0) | |
2493 | return 0; | |
2494 | } | |
2495 | ||
2496 | /* Verify that the auxilliary vector describes the same file as exec_bfd, by | |
2497 | comparing their program headers. If the program headers in the auxilliary | |
2498 | vector do not match the program headers in the executable, then we are | |
2499 | looking at a different file than the one used by the kernel - for | |
2500 | instance, "gdb program" connected to "gdbserver :PORT ld.so program". */ | |
2501 | ||
2502 | if (bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
2503 | { | |
2504 | /* Be optimistic and clear OK only if GDB was able to verify the headers | |
2505 | really do not match. */ | |
2506 | int phdrs_size, phdrs2_size, ok = 1; | |
2507 | gdb_byte *buf, *buf2; | |
0a1e94c7 | 2508 | int arch_size; |
09919ac2 | 2509 | |
0a1e94c7 | 2510 | buf = read_program_header (-1, &phdrs_size, &arch_size); |
09919ac2 | 2511 | buf2 = read_program_headers_from_bfd (exec_bfd, &phdrs2_size); |
0a1e94c7 JK |
2512 | if (buf != NULL && buf2 != NULL) |
2513 | { | |
f5656ead | 2514 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
0a1e94c7 JK |
2515 | |
2516 | /* We are dealing with three different addresses. EXEC_BFD | |
2517 | represents current address in on-disk file. target memory content | |
2518 | may be different from EXEC_BFD as the file may have been prelinked | |
2519 | to a different address after the executable has been loaded. | |
2520 | Moreover the address of placement in target memory can be | |
3e43a32a MS |
2521 | different from what the program headers in target memory say - |
2522 | this is the goal of PIE. | |
0a1e94c7 JK |
2523 | |
2524 | Detected DISPLACEMENT covers both the offsets of PIE placement and | |
2525 | possible new prelink performed after start of the program. Here | |
2526 | relocate BUF and BUF2 just by the EXEC_BFD vs. target memory | |
2527 | content offset for the verification purpose. */ | |
2528 | ||
2529 | if (phdrs_size != phdrs2_size | |
2530 | || bfd_get_arch_size (exec_bfd) != arch_size) | |
2531 | ok = 0; | |
3e43a32a MS |
2532 | else if (arch_size == 32 |
2533 | && phdrs_size >= sizeof (Elf32_External_Phdr) | |
0a1e94c7 JK |
2534 | && phdrs_size % sizeof (Elf32_External_Phdr) == 0) |
2535 | { | |
2536 | Elf_Internal_Ehdr *ehdr2 = elf_tdata (exec_bfd)->elf_header; | |
2537 | Elf_Internal_Phdr *phdr2 = elf_tdata (exec_bfd)->phdr; | |
2538 | CORE_ADDR displacement = 0; | |
2539 | int i; | |
2540 | ||
2541 | /* DISPLACEMENT could be found more easily by the difference of | |
2542 | ehdr2->e_entry. But we haven't read the ehdr yet, and we | |
2543 | already have enough information to compute that displacement | |
2544 | with what we've read. */ | |
2545 | ||
2546 | for (i = 0; i < ehdr2->e_phnum; i++) | |
2547 | if (phdr2[i].p_type == PT_LOAD) | |
2548 | { | |
2549 | Elf32_External_Phdr *phdrp; | |
2550 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
2551 | CORE_ADDR vaddr, paddr; | |
2552 | CORE_ADDR displacement_vaddr = 0; | |
2553 | CORE_ADDR displacement_paddr = 0; | |
2554 | ||
2555 | phdrp = &((Elf32_External_Phdr *) buf)[i]; | |
2556 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; | |
2557 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
2558 | ||
2559 | vaddr = extract_unsigned_integer (buf_vaddr_p, 4, | |
2560 | byte_order); | |
2561 | displacement_vaddr = vaddr - phdr2[i].p_vaddr; | |
2562 | ||
2563 | paddr = extract_unsigned_integer (buf_paddr_p, 4, | |
2564 | byte_order); | |
2565 | displacement_paddr = paddr - phdr2[i].p_paddr; | |
2566 | ||
2567 | if (displacement_vaddr == displacement_paddr) | |
2568 | displacement = displacement_vaddr; | |
2569 | ||
2570 | break; | |
2571 | } | |
2572 | ||
2573 | /* Now compare BUF and BUF2 with optional DISPLACEMENT. */ | |
2574 | ||
2575 | for (i = 0; i < phdrs_size / sizeof (Elf32_External_Phdr); i++) | |
2576 | { | |
2577 | Elf32_External_Phdr *phdrp; | |
2578 | Elf32_External_Phdr *phdr2p; | |
2579 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
2580 | CORE_ADDR vaddr, paddr; | |
43b8e241 | 2581 | asection *plt2_asect; |
0a1e94c7 JK |
2582 | |
2583 | phdrp = &((Elf32_External_Phdr *) buf)[i]; | |
2584 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; | |
2585 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
2586 | phdr2p = &((Elf32_External_Phdr *) buf2)[i]; | |
2587 | ||
2588 | /* PT_GNU_STACK is an exception by being never relocated by | |
2589 | prelink as its addresses are always zero. */ | |
2590 | ||
2591 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2592 | continue; | |
2593 | ||
2594 | /* Check also other adjustment combinations - PR 11786. */ | |
2595 | ||
3e43a32a MS |
2596 | vaddr = extract_unsigned_integer (buf_vaddr_p, 4, |
2597 | byte_order); | |
0a1e94c7 JK |
2598 | vaddr -= displacement; |
2599 | store_unsigned_integer (buf_vaddr_p, 4, byte_order, vaddr); | |
2600 | ||
3e43a32a MS |
2601 | paddr = extract_unsigned_integer (buf_paddr_p, 4, |
2602 | byte_order); | |
0a1e94c7 JK |
2603 | paddr -= displacement; |
2604 | store_unsigned_integer (buf_paddr_p, 4, byte_order, paddr); | |
2605 | ||
2606 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2607 | continue; | |
2608 | ||
204b5331 DE |
2609 | /* Strip modifies the flags and alignment of PT_GNU_RELRO. |
2610 | CentOS-5 has problems with filesz, memsz as well. | |
2611 | See PR 11786. */ | |
2612 | if (phdr2[i].p_type == PT_GNU_RELRO) | |
2613 | { | |
2614 | Elf32_External_Phdr tmp_phdr = *phdrp; | |
2615 | Elf32_External_Phdr tmp_phdr2 = *phdr2p; | |
2616 | ||
2617 | memset (tmp_phdr.p_filesz, 0, 4); | |
2618 | memset (tmp_phdr.p_memsz, 0, 4); | |
2619 | memset (tmp_phdr.p_flags, 0, 4); | |
2620 | memset (tmp_phdr.p_align, 0, 4); | |
2621 | memset (tmp_phdr2.p_filesz, 0, 4); | |
2622 | memset (tmp_phdr2.p_memsz, 0, 4); | |
2623 | memset (tmp_phdr2.p_flags, 0, 4); | |
2624 | memset (tmp_phdr2.p_align, 0, 4); | |
2625 | ||
2626 | if (memcmp (&tmp_phdr, &tmp_phdr2, sizeof (tmp_phdr)) | |
2627 | == 0) | |
2628 | continue; | |
2629 | } | |
2630 | ||
43b8e241 JK |
2631 | /* prelink can convert .plt SHT_NOBITS to SHT_PROGBITS. */ |
2632 | plt2_asect = bfd_get_section_by_name (exec_bfd, ".plt"); | |
2633 | if (plt2_asect) | |
2634 | { | |
2635 | int content2; | |
2636 | gdb_byte *buf_filesz_p = (gdb_byte *) &phdrp->p_filesz; | |
2637 | CORE_ADDR filesz; | |
2638 | ||
2639 | content2 = (bfd_get_section_flags (exec_bfd, plt2_asect) | |
2640 | & SEC_HAS_CONTENTS) != 0; | |
2641 | ||
2642 | filesz = extract_unsigned_integer (buf_filesz_p, 4, | |
2643 | byte_order); | |
2644 | ||
2645 | /* PLT2_ASECT is from on-disk file (exec_bfd) while | |
2646 | FILESZ is from the in-memory image. */ | |
2647 | if (content2) | |
2648 | filesz += bfd_get_section_size (plt2_asect); | |
2649 | else | |
2650 | filesz -= bfd_get_section_size (plt2_asect); | |
2651 | ||
2652 | store_unsigned_integer (buf_filesz_p, 4, byte_order, | |
2653 | filesz); | |
2654 | ||
2655 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2656 | continue; | |
2657 | } | |
2658 | ||
0a1e94c7 JK |
2659 | ok = 0; |
2660 | break; | |
2661 | } | |
2662 | } | |
3e43a32a MS |
2663 | else if (arch_size == 64 |
2664 | && phdrs_size >= sizeof (Elf64_External_Phdr) | |
0a1e94c7 JK |
2665 | && phdrs_size % sizeof (Elf64_External_Phdr) == 0) |
2666 | { | |
2667 | Elf_Internal_Ehdr *ehdr2 = elf_tdata (exec_bfd)->elf_header; | |
2668 | Elf_Internal_Phdr *phdr2 = elf_tdata (exec_bfd)->phdr; | |
2669 | CORE_ADDR displacement = 0; | |
2670 | int i; | |
2671 | ||
2672 | /* DISPLACEMENT could be found more easily by the difference of | |
2673 | ehdr2->e_entry. But we haven't read the ehdr yet, and we | |
2674 | already have enough information to compute that displacement | |
2675 | with what we've read. */ | |
2676 | ||
2677 | for (i = 0; i < ehdr2->e_phnum; i++) | |
2678 | if (phdr2[i].p_type == PT_LOAD) | |
2679 | { | |
2680 | Elf64_External_Phdr *phdrp; | |
2681 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
2682 | CORE_ADDR vaddr, paddr; | |
2683 | CORE_ADDR displacement_vaddr = 0; | |
2684 | CORE_ADDR displacement_paddr = 0; | |
2685 | ||
2686 | phdrp = &((Elf64_External_Phdr *) buf)[i]; | |
2687 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; | |
2688 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
2689 | ||
2690 | vaddr = extract_unsigned_integer (buf_vaddr_p, 8, | |
2691 | byte_order); | |
2692 | displacement_vaddr = vaddr - phdr2[i].p_vaddr; | |
2693 | ||
2694 | paddr = extract_unsigned_integer (buf_paddr_p, 8, | |
2695 | byte_order); | |
2696 | displacement_paddr = paddr - phdr2[i].p_paddr; | |
2697 | ||
2698 | if (displacement_vaddr == displacement_paddr) | |
2699 | displacement = displacement_vaddr; | |
2700 | ||
2701 | break; | |
2702 | } | |
2703 | ||
2704 | /* Now compare BUF and BUF2 with optional DISPLACEMENT. */ | |
2705 | ||
2706 | for (i = 0; i < phdrs_size / sizeof (Elf64_External_Phdr); i++) | |
2707 | { | |
2708 | Elf64_External_Phdr *phdrp; | |
2709 | Elf64_External_Phdr *phdr2p; | |
2710 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
2711 | CORE_ADDR vaddr, paddr; | |
43b8e241 | 2712 | asection *plt2_asect; |
0a1e94c7 JK |
2713 | |
2714 | phdrp = &((Elf64_External_Phdr *) buf)[i]; | |
2715 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; | |
2716 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
2717 | phdr2p = &((Elf64_External_Phdr *) buf2)[i]; | |
2718 | ||
2719 | /* PT_GNU_STACK is an exception by being never relocated by | |
2720 | prelink as its addresses are always zero. */ | |
2721 | ||
2722 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2723 | continue; | |
2724 | ||
2725 | /* Check also other adjustment combinations - PR 11786. */ | |
2726 | ||
3e43a32a MS |
2727 | vaddr = extract_unsigned_integer (buf_vaddr_p, 8, |
2728 | byte_order); | |
0a1e94c7 JK |
2729 | vaddr -= displacement; |
2730 | store_unsigned_integer (buf_vaddr_p, 8, byte_order, vaddr); | |
2731 | ||
3e43a32a MS |
2732 | paddr = extract_unsigned_integer (buf_paddr_p, 8, |
2733 | byte_order); | |
0a1e94c7 JK |
2734 | paddr -= displacement; |
2735 | store_unsigned_integer (buf_paddr_p, 8, byte_order, paddr); | |
2736 | ||
2737 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2738 | continue; | |
2739 | ||
204b5331 DE |
2740 | /* Strip modifies the flags and alignment of PT_GNU_RELRO. |
2741 | CentOS-5 has problems with filesz, memsz as well. | |
2742 | See PR 11786. */ | |
2743 | if (phdr2[i].p_type == PT_GNU_RELRO) | |
2744 | { | |
2745 | Elf64_External_Phdr tmp_phdr = *phdrp; | |
2746 | Elf64_External_Phdr tmp_phdr2 = *phdr2p; | |
2747 | ||
2748 | memset (tmp_phdr.p_filesz, 0, 8); | |
2749 | memset (tmp_phdr.p_memsz, 0, 8); | |
2750 | memset (tmp_phdr.p_flags, 0, 4); | |
2751 | memset (tmp_phdr.p_align, 0, 8); | |
2752 | memset (tmp_phdr2.p_filesz, 0, 8); | |
2753 | memset (tmp_phdr2.p_memsz, 0, 8); | |
2754 | memset (tmp_phdr2.p_flags, 0, 4); | |
2755 | memset (tmp_phdr2.p_align, 0, 8); | |
2756 | ||
2757 | if (memcmp (&tmp_phdr, &tmp_phdr2, sizeof (tmp_phdr)) | |
2758 | == 0) | |
2759 | continue; | |
2760 | } | |
2761 | ||
43b8e241 JK |
2762 | /* prelink can convert .plt SHT_NOBITS to SHT_PROGBITS. */ |
2763 | plt2_asect = bfd_get_section_by_name (exec_bfd, ".plt"); | |
2764 | if (plt2_asect) | |
2765 | { | |
2766 | int content2; | |
2767 | gdb_byte *buf_filesz_p = (gdb_byte *) &phdrp->p_filesz; | |
2768 | CORE_ADDR filesz; | |
2769 | ||
2770 | content2 = (bfd_get_section_flags (exec_bfd, plt2_asect) | |
2771 | & SEC_HAS_CONTENTS) != 0; | |
2772 | ||
2773 | filesz = extract_unsigned_integer (buf_filesz_p, 8, | |
2774 | byte_order); | |
2775 | ||
2776 | /* PLT2_ASECT is from on-disk file (exec_bfd) while | |
2777 | FILESZ is from the in-memory image. */ | |
2778 | if (content2) | |
2779 | filesz += bfd_get_section_size (plt2_asect); | |
2780 | else | |
2781 | filesz -= bfd_get_section_size (plt2_asect); | |
2782 | ||
2783 | store_unsigned_integer (buf_filesz_p, 8, byte_order, | |
2784 | filesz); | |
2785 | ||
2786 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2787 | continue; | |
2788 | } | |
2789 | ||
0a1e94c7 JK |
2790 | ok = 0; |
2791 | break; | |
2792 | } | |
2793 | } | |
2794 | else | |
2795 | ok = 0; | |
2796 | } | |
09919ac2 JK |
2797 | |
2798 | xfree (buf); | |
2799 | xfree (buf2); | |
2800 | ||
2801 | if (!ok) | |
2802 | return 0; | |
2803 | } | |
b8040f19 | 2804 | |
ccf26247 JK |
2805 | if (info_verbose) |
2806 | { | |
2807 | /* It can be printed repeatedly as there is no easy way to check | |
2808 | the executable symbols/file has been already relocated to | |
2809 | displacement. */ | |
2810 | ||
2811 | printf_unfiltered (_("Using PIE (Position Independent Executable) " | |
2812 | "displacement %s for \"%s\".\n"), | |
f5656ead | 2813 | paddress (target_gdbarch (), displacement), |
ccf26247 JK |
2814 | bfd_get_filename (exec_bfd)); |
2815 | } | |
2816 | ||
01c30d6e JK |
2817 | *displacementp = displacement; |
2818 | return 1; | |
b8040f19 JK |
2819 | } |
2820 | ||
2821 | /* Relocate the main executable. This function should be called upon | |
c378eb4e | 2822 | stopping the inferior process at the entry point to the program. |
b8040f19 JK |
2823 | The entry point from BFD is compared to the AT_ENTRY of AUXV and if they are |
2824 | different, the main executable is relocated by the proper amount. */ | |
2825 | ||
2826 | static void | |
2827 | svr4_relocate_main_executable (void) | |
2828 | { | |
01c30d6e JK |
2829 | CORE_ADDR displacement; |
2830 | ||
4e5799b6 JK |
2831 | /* If we are re-running this executable, SYMFILE_OBJFILE->SECTION_OFFSETS |
2832 | probably contains the offsets computed using the PIE displacement | |
2833 | from the previous run, which of course are irrelevant for this run. | |
2834 | So we need to determine the new PIE displacement and recompute the | |
2835 | section offsets accordingly, even if SYMFILE_OBJFILE->SECTION_OFFSETS | |
2836 | already contains pre-computed offsets. | |
01c30d6e | 2837 | |
4e5799b6 | 2838 | If we cannot compute the PIE displacement, either: |
01c30d6e | 2839 | |
4e5799b6 JK |
2840 | - The executable is not PIE. |
2841 | ||
2842 | - SYMFILE_OBJFILE does not match the executable started in the target. | |
2843 | This can happen for main executable symbols loaded at the host while | |
2844 | `ld.so --ld-args main-executable' is loaded in the target. | |
2845 | ||
2846 | Then we leave the section offsets untouched and use them as is for | |
2847 | this run. Either: | |
2848 | ||
2849 | - These section offsets were properly reset earlier, and thus | |
2850 | already contain the correct values. This can happen for instance | |
2851 | when reconnecting via the remote protocol to a target that supports | |
2852 | the `qOffsets' packet. | |
2853 | ||
2854 | - The section offsets were not reset earlier, and the best we can | |
c378eb4e | 2855 | hope is that the old offsets are still applicable to the new run. */ |
01c30d6e JK |
2856 | |
2857 | if (! svr4_exec_displacement (&displacement)) | |
2858 | return; | |
b8040f19 | 2859 | |
01c30d6e JK |
2860 | /* Even DISPLACEMENT 0 is a valid new difference of in-memory vs. in-file |
2861 | addresses. */ | |
b8040f19 JK |
2862 | |
2863 | if (symfile_objfile) | |
e2a44558 | 2864 | { |
e2a44558 | 2865 | struct section_offsets *new_offsets; |
b8040f19 | 2866 | int i; |
e2a44558 | 2867 | |
b8040f19 JK |
2868 | new_offsets = alloca (symfile_objfile->num_sections |
2869 | * sizeof (*new_offsets)); | |
e2a44558 | 2870 | |
b8040f19 JK |
2871 | for (i = 0; i < symfile_objfile->num_sections; i++) |
2872 | new_offsets->offsets[i] = displacement; | |
e2a44558 | 2873 | |
b8040f19 | 2874 | objfile_relocate (symfile_objfile, new_offsets); |
e2a44558 | 2875 | } |
51bee8e9 JK |
2876 | else if (exec_bfd) |
2877 | { | |
2878 | asection *asect; | |
2879 | ||
2880 | for (asect = exec_bfd->sections; asect != NULL; asect = asect->next) | |
2881 | exec_set_section_address (bfd_get_filename (exec_bfd), asect->index, | |
2882 | (bfd_section_vma (exec_bfd, asect) | |
2883 | + displacement)); | |
2884 | } | |
e2a44558 KB |
2885 | } |
2886 | ||
7f86f058 | 2887 | /* Implement the "create_inferior_hook" target_solib_ops method. |
13437d4b KB |
2888 | |
2889 | For SVR4 executables, this first instruction is either the first | |
2890 | instruction in the dynamic linker (for dynamically linked | |
2891 | executables) or the instruction at "start" for statically linked | |
2892 | executables. For dynamically linked executables, the system | |
2893 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
2894 | and starts it running. The dynamic linker maps in any needed | |
2895 | shared libraries, maps in the actual user executable, and then | |
2896 | jumps to "start" in the user executable. | |
2897 | ||
7f86f058 PA |
2898 | We can arrange to cooperate with the dynamic linker to discover the |
2899 | names of shared libraries that are dynamically linked, and the base | |
2900 | addresses to which they are linked. | |
13437d4b KB |
2901 | |
2902 | This function is responsible for discovering those names and | |
2903 | addresses, and saving sufficient information about them to allow | |
d2e5c99a | 2904 | their symbols to be read at a later time. */ |
13437d4b | 2905 | |
e2a44558 | 2906 | static void |
268a4a75 | 2907 | svr4_solib_create_inferior_hook (int from_tty) |
13437d4b | 2908 | { |
1a816a87 PA |
2909 | struct svr4_info *info; |
2910 | ||
6c95b8df | 2911 | info = get_svr4_info (); |
2020b7ab | 2912 | |
f9e14852 GB |
2913 | /* Clear the probes-based interface's state. */ |
2914 | free_probes_table (info); | |
2915 | free_solib_list (info); | |
2916 | ||
e2a44558 | 2917 | /* Relocate the main executable if necessary. */ |
86e4bafc | 2918 | svr4_relocate_main_executable (); |
e2a44558 | 2919 | |
c91c8c16 PA |
2920 | /* No point setting a breakpoint in the dynamic linker if we can't |
2921 | hit it (e.g., a core file, or a trace file). */ | |
2922 | if (!target_has_execution) | |
2923 | return; | |
2924 | ||
d5a921c9 | 2925 | if (!svr4_have_link_map_offsets ()) |
513f5903 | 2926 | return; |
d5a921c9 | 2927 | |
268a4a75 | 2928 | if (!enable_break (info, from_tty)) |
542c95c2 | 2929 | return; |
13437d4b KB |
2930 | } |
2931 | ||
2932 | static void | |
2933 | svr4_clear_solib (void) | |
2934 | { | |
6c95b8df PA |
2935 | struct svr4_info *info; |
2936 | ||
2937 | info = get_svr4_info (); | |
2938 | info->debug_base = 0; | |
2939 | info->debug_loader_offset_p = 0; | |
2940 | info->debug_loader_offset = 0; | |
2941 | xfree (info->debug_loader_name); | |
2942 | info->debug_loader_name = NULL; | |
13437d4b KB |
2943 | } |
2944 | ||
6bb7be43 JB |
2945 | /* Clear any bits of ADDR that wouldn't fit in a target-format |
2946 | data pointer. "Data pointer" here refers to whatever sort of | |
2947 | address the dynamic linker uses to manage its sections. At the | |
2948 | moment, we don't support shared libraries on any processors where | |
2949 | code and data pointers are different sizes. | |
2950 | ||
2951 | This isn't really the right solution. What we really need here is | |
2952 | a way to do arithmetic on CORE_ADDR values that respects the | |
2953 | natural pointer/address correspondence. (For example, on the MIPS, | |
2954 | converting a 32-bit pointer to a 64-bit CORE_ADDR requires you to | |
2955 | sign-extend the value. There, simply truncating the bits above | |
819844ad | 2956 | gdbarch_ptr_bit, as we do below, is no good.) This should probably |
6bb7be43 JB |
2957 | be a new gdbarch method or something. */ |
2958 | static CORE_ADDR | |
2959 | svr4_truncate_ptr (CORE_ADDR addr) | |
2960 | { | |
f5656ead | 2961 | if (gdbarch_ptr_bit (target_gdbarch ()) == sizeof (CORE_ADDR) * 8) |
6bb7be43 JB |
2962 | /* We don't need to truncate anything, and the bit twiddling below |
2963 | will fail due to overflow problems. */ | |
2964 | return addr; | |
2965 | else | |
f5656ead | 2966 | return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch ())) - 1); |
6bb7be43 JB |
2967 | } |
2968 | ||
2969 | ||
749499cb KB |
2970 | static void |
2971 | svr4_relocate_section_addresses (struct so_list *so, | |
0542c86d | 2972 | struct target_section *sec) |
749499cb | 2973 | { |
2b2848e2 DE |
2974 | bfd *abfd = sec->the_bfd_section->owner; |
2975 | ||
2976 | sec->addr = svr4_truncate_ptr (sec->addr + lm_addr_check (so, abfd)); | |
2977 | sec->endaddr = svr4_truncate_ptr (sec->endaddr + lm_addr_check (so, abfd)); | |
749499cb | 2978 | } |
4b188b9f | 2979 | \f |
749499cb | 2980 | |
4b188b9f | 2981 | /* Architecture-specific operations. */ |
6bb7be43 | 2982 | |
4b188b9f MK |
2983 | /* Per-architecture data key. */ |
2984 | static struct gdbarch_data *solib_svr4_data; | |
e5e2b9ff | 2985 | |
4b188b9f | 2986 | struct solib_svr4_ops |
e5e2b9ff | 2987 | { |
4b188b9f MK |
2988 | /* Return a description of the layout of `struct link_map'. */ |
2989 | struct link_map_offsets *(*fetch_link_map_offsets)(void); | |
2990 | }; | |
e5e2b9ff | 2991 | |
4b188b9f | 2992 | /* Return a default for the architecture-specific operations. */ |
e5e2b9ff | 2993 | |
4b188b9f MK |
2994 | static void * |
2995 | solib_svr4_init (struct obstack *obstack) | |
e5e2b9ff | 2996 | { |
4b188b9f | 2997 | struct solib_svr4_ops *ops; |
e5e2b9ff | 2998 | |
4b188b9f | 2999 | ops = OBSTACK_ZALLOC (obstack, struct solib_svr4_ops); |
8d005789 | 3000 | ops->fetch_link_map_offsets = NULL; |
4b188b9f | 3001 | return ops; |
e5e2b9ff KB |
3002 | } |
3003 | ||
4b188b9f | 3004 | /* Set the architecture-specific `struct link_map_offsets' fetcher for |
7e3cb44c | 3005 | GDBARCH to FLMO. Also, install SVR4 solib_ops into GDBARCH. */ |
1c4dcb57 | 3006 | |
21479ded | 3007 | void |
e5e2b9ff KB |
3008 | set_solib_svr4_fetch_link_map_offsets (struct gdbarch *gdbarch, |
3009 | struct link_map_offsets *(*flmo) (void)) | |
21479ded | 3010 | { |
4b188b9f MK |
3011 | struct solib_svr4_ops *ops = gdbarch_data (gdbarch, solib_svr4_data); |
3012 | ||
3013 | ops->fetch_link_map_offsets = flmo; | |
7e3cb44c UW |
3014 | |
3015 | set_solib_ops (gdbarch, &svr4_so_ops); | |
21479ded KB |
3016 | } |
3017 | ||
4b188b9f MK |
3018 | /* Fetch a link_map_offsets structure using the architecture-specific |
3019 | `struct link_map_offsets' fetcher. */ | |
1c4dcb57 | 3020 | |
4b188b9f MK |
3021 | static struct link_map_offsets * |
3022 | svr4_fetch_link_map_offsets (void) | |
21479ded | 3023 | { |
f5656ead | 3024 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch (), solib_svr4_data); |
4b188b9f MK |
3025 | |
3026 | gdb_assert (ops->fetch_link_map_offsets); | |
3027 | return ops->fetch_link_map_offsets (); | |
21479ded KB |
3028 | } |
3029 | ||
4b188b9f MK |
3030 | /* Return 1 if a link map offset fetcher has been defined, 0 otherwise. */ |
3031 | ||
3032 | static int | |
3033 | svr4_have_link_map_offsets (void) | |
3034 | { | |
f5656ead | 3035 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch (), solib_svr4_data); |
433759f7 | 3036 | |
4b188b9f MK |
3037 | return (ops->fetch_link_map_offsets != NULL); |
3038 | } | |
3039 | \f | |
3040 | ||
e4bbbda8 MK |
3041 | /* Most OS'es that have SVR4-style ELF dynamic libraries define a |
3042 | `struct r_debug' and a `struct link_map' that are binary compatible | |
3043 | with the origional SVR4 implementation. */ | |
3044 | ||
3045 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
3046 | for an ILP32 SVR4 system. */ | |
d989b283 | 3047 | |
e4bbbda8 MK |
3048 | struct link_map_offsets * |
3049 | svr4_ilp32_fetch_link_map_offsets (void) | |
3050 | { | |
3051 | static struct link_map_offsets lmo; | |
3052 | static struct link_map_offsets *lmp = NULL; | |
3053 | ||
3054 | if (lmp == NULL) | |
3055 | { | |
3056 | lmp = &lmo; | |
3057 | ||
e4cd0d6a MK |
3058 | lmo.r_version_offset = 0; |
3059 | lmo.r_version_size = 4; | |
e4bbbda8 | 3060 | lmo.r_map_offset = 4; |
7cd25cfc | 3061 | lmo.r_brk_offset = 8; |
e4cd0d6a | 3062 | lmo.r_ldsomap_offset = 20; |
e4bbbda8 MK |
3063 | |
3064 | /* Everything we need is in the first 20 bytes. */ | |
3065 | lmo.link_map_size = 20; | |
3066 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 3067 | lmo.l_name_offset = 4; |
cc10cae3 | 3068 | lmo.l_ld_offset = 8; |
e4bbbda8 | 3069 | lmo.l_next_offset = 12; |
e4bbbda8 | 3070 | lmo.l_prev_offset = 16; |
e4bbbda8 MK |
3071 | } |
3072 | ||
3073 | return lmp; | |
3074 | } | |
3075 | ||
3076 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
3077 | for an LP64 SVR4 system. */ | |
d989b283 | 3078 | |
e4bbbda8 MK |
3079 | struct link_map_offsets * |
3080 | svr4_lp64_fetch_link_map_offsets (void) | |
3081 | { | |
3082 | static struct link_map_offsets lmo; | |
3083 | static struct link_map_offsets *lmp = NULL; | |
3084 | ||
3085 | if (lmp == NULL) | |
3086 | { | |
3087 | lmp = &lmo; | |
3088 | ||
e4cd0d6a MK |
3089 | lmo.r_version_offset = 0; |
3090 | lmo.r_version_size = 4; | |
e4bbbda8 | 3091 | lmo.r_map_offset = 8; |
7cd25cfc | 3092 | lmo.r_brk_offset = 16; |
e4cd0d6a | 3093 | lmo.r_ldsomap_offset = 40; |
e4bbbda8 MK |
3094 | |
3095 | /* Everything we need is in the first 40 bytes. */ | |
3096 | lmo.link_map_size = 40; | |
3097 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 3098 | lmo.l_name_offset = 8; |
cc10cae3 | 3099 | lmo.l_ld_offset = 16; |
e4bbbda8 | 3100 | lmo.l_next_offset = 24; |
e4bbbda8 | 3101 | lmo.l_prev_offset = 32; |
e4bbbda8 MK |
3102 | } |
3103 | ||
3104 | return lmp; | |
3105 | } | |
3106 | \f | |
3107 | ||
7d522c90 | 3108 | struct target_so_ops svr4_so_ops; |
13437d4b | 3109 | |
c378eb4e | 3110 | /* Lookup global symbol for ELF DSOs linked with -Bsymbolic. Those DSOs have a |
3a40aaa0 UW |
3111 | different rule for symbol lookup. The lookup begins here in the DSO, not in |
3112 | the main executable. */ | |
3113 | ||
3114 | static struct symbol * | |
3115 | elf_lookup_lib_symbol (const struct objfile *objfile, | |
3116 | const char *name, | |
21b556f4 | 3117 | const domain_enum domain) |
3a40aaa0 | 3118 | { |
61f0d762 JK |
3119 | bfd *abfd; |
3120 | ||
3121 | if (objfile == symfile_objfile) | |
3122 | abfd = exec_bfd; | |
3123 | else | |
3124 | { | |
3125 | /* OBJFILE should have been passed as the non-debug one. */ | |
3126 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
3127 | ||
3128 | abfd = objfile->obfd; | |
3129 | } | |
3130 | ||
3131 | if (abfd == NULL || scan_dyntag (DT_SYMBOLIC, abfd, NULL) != 1) | |
3a40aaa0 UW |
3132 | return NULL; |
3133 | ||
94af9270 | 3134 | return lookup_global_symbol_from_objfile (objfile, name, domain); |
3a40aaa0 UW |
3135 | } |
3136 | ||
a78f21af AC |
3137 | extern initialize_file_ftype _initialize_svr4_solib; /* -Wmissing-prototypes */ |
3138 | ||
13437d4b KB |
3139 | void |
3140 | _initialize_svr4_solib (void) | |
3141 | { | |
4b188b9f | 3142 | solib_svr4_data = gdbarch_data_register_pre_init (solib_svr4_init); |
6c95b8df | 3143 | solib_svr4_pspace_data |
8e260fc0 | 3144 | = register_program_space_data_with_cleanup (NULL, svr4_pspace_data_cleanup); |
4b188b9f | 3145 | |
749499cb | 3146 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b | 3147 | svr4_so_ops.free_so = svr4_free_so; |
0892cb63 | 3148 | svr4_so_ops.clear_so = svr4_clear_so; |
13437d4b KB |
3149 | svr4_so_ops.clear_solib = svr4_clear_solib; |
3150 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
3151 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |
3152 | svr4_so_ops.current_sos = svr4_current_sos; | |
3153 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
d7fa2ae2 | 3154 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; |
831a0c44 | 3155 | svr4_so_ops.bfd_open = solib_bfd_open; |
3a40aaa0 | 3156 | svr4_so_ops.lookup_lib_global_symbol = elf_lookup_lib_symbol; |
a7c02bc8 | 3157 | svr4_so_ops.same = svr4_same; |
de18c1d8 | 3158 | svr4_so_ops.keep_data_in_core = svr4_keep_data_in_core; |
f9e14852 GB |
3159 | svr4_so_ops.update_breakpoints = svr4_update_solib_event_breakpoints; |
3160 | svr4_so_ops.handle_event = svr4_handle_solib_event; | |
13437d4b | 3161 | } |