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ab31aa69 | 1 | /* Handle SVR4 shared libraries for GDB, the GNU Debugger. |
2f4950cd | 2 | |
42a4f53d | 3 | Copyright (C) 1990-2019 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" |
45741a9c | 33 | #include "infrun.h" |
fb14de7b | 34 | #include "regcache.h" |
2020b7ab | 35 | #include "gdbthread.h" |
76727919 | 36 | #include "observable.h" |
13437d4b KB |
37 | |
38 | #include "solist.h" | |
bba93f6c | 39 | #include "solib.h" |
13437d4b KB |
40 | #include "solib-svr4.h" |
41 | ||
2f4950cd | 42 | #include "bfd-target.h" |
cc10cae3 | 43 | #include "elf-bfd.h" |
2f4950cd | 44 | #include "exec.h" |
8d4e36ba | 45 | #include "auxv.h" |
695c3173 | 46 | #include "gdb_bfd.h" |
f9e14852 | 47 | #include "probe.h" |
2f4950cd | 48 | |
e5e2b9ff | 49 | static struct link_map_offsets *svr4_fetch_link_map_offsets (void); |
d5a921c9 | 50 | static int svr4_have_link_map_offsets (void); |
9f2982ff | 51 | static void svr4_relocate_main_executable (void); |
f9e14852 | 52 | static void svr4_free_library_list (void *p_list); |
1c4dcb57 | 53 | |
13437d4b KB |
54 | /* On SVR4 systems, a list of symbols in the dynamic linker where |
55 | GDB can try to place a breakpoint to monitor shared library | |
56 | events. | |
57 | ||
58 | If none of these symbols are found, or other errors occur, then | |
59 | SVR4 systems will fall back to using a symbol as the "startup | |
60 | mapping complete" breakpoint address. */ | |
61 | ||
bc043ef3 | 62 | static const char * const solib_break_names[] = |
13437d4b KB |
63 | { |
64 | "r_debug_state", | |
65 | "_r_debug_state", | |
66 | "_dl_debug_state", | |
67 | "rtld_db_dlactivity", | |
4c7dcb84 | 68 | "__dl_rtld_db_dlactivity", |
1f72e589 | 69 | "_rtld_debug_state", |
4c0122c8 | 70 | |
13437d4b KB |
71 | NULL |
72 | }; | |
13437d4b | 73 | |
bc043ef3 | 74 | static const char * const bkpt_names[] = |
13437d4b | 75 | { |
13437d4b | 76 | "_start", |
ad3dcc5c | 77 | "__start", |
13437d4b KB |
78 | "main", |
79 | NULL | |
80 | }; | |
13437d4b | 81 | |
bc043ef3 | 82 | static const char * const main_name_list[] = |
13437d4b KB |
83 | { |
84 | "main_$main", | |
85 | NULL | |
86 | }; | |
87 | ||
f9e14852 GB |
88 | /* What to do when a probe stop occurs. */ |
89 | ||
90 | enum probe_action | |
91 | { | |
92 | /* Something went seriously wrong. Stop using probes and | |
93 | revert to using the older interface. */ | |
94 | PROBES_INTERFACE_FAILED, | |
95 | ||
96 | /* No action is required. The shared object list is still | |
97 | valid. */ | |
98 | DO_NOTHING, | |
99 | ||
100 | /* The shared object list should be reloaded entirely. */ | |
101 | FULL_RELOAD, | |
102 | ||
103 | /* Attempt to incrementally update the shared object list. If | |
104 | the update fails or is not possible, fall back to reloading | |
105 | the list in full. */ | |
106 | UPDATE_OR_RELOAD, | |
107 | }; | |
108 | ||
109 | /* A probe's name and its associated action. */ | |
110 | ||
111 | struct probe_info | |
112 | { | |
113 | /* The name of the probe. */ | |
114 | const char *name; | |
115 | ||
116 | /* What to do when a probe stop occurs. */ | |
117 | enum probe_action action; | |
118 | }; | |
119 | ||
120 | /* A list of named probes and their associated actions. If all | |
121 | probes are present in the dynamic linker then the probes-based | |
122 | interface will be used. */ | |
123 | ||
124 | static const struct probe_info probe_info[] = | |
125 | { | |
126 | { "init_start", DO_NOTHING }, | |
127 | { "init_complete", FULL_RELOAD }, | |
128 | { "map_start", DO_NOTHING }, | |
129 | { "map_failed", DO_NOTHING }, | |
130 | { "reloc_complete", UPDATE_OR_RELOAD }, | |
131 | { "unmap_start", DO_NOTHING }, | |
132 | { "unmap_complete", FULL_RELOAD }, | |
133 | }; | |
134 | ||
135 | #define NUM_PROBES ARRAY_SIZE (probe_info) | |
136 | ||
4d7b2d5b JB |
137 | /* Return non-zero if GDB_SO_NAME and INFERIOR_SO_NAME represent |
138 | the same shared library. */ | |
139 | ||
140 | static int | |
141 | svr4_same_1 (const char *gdb_so_name, const char *inferior_so_name) | |
142 | { | |
143 | if (strcmp (gdb_so_name, inferior_so_name) == 0) | |
144 | return 1; | |
145 | ||
146 | /* On Solaris, when starting inferior we think that dynamic linker is | |
d989b283 PP |
147 | /usr/lib/ld.so.1, but later on, the table of loaded shared libraries |
148 | contains /lib/ld.so.1. Sometimes one file is a link to another, but | |
4d7b2d5b JB |
149 | sometimes they have identical content, but are not linked to each |
150 | other. We don't restrict this check for Solaris, but the chances | |
151 | of running into this situation elsewhere are very low. */ | |
152 | if (strcmp (gdb_so_name, "/usr/lib/ld.so.1") == 0 | |
153 | && strcmp (inferior_so_name, "/lib/ld.so.1") == 0) | |
154 | return 1; | |
155 | ||
7307a73a | 156 | /* Similarly, we observed the same issue with amd64 and sparcv9, but with |
4d7b2d5b | 157 | different locations. */ |
7307a73a RO |
158 | if (strcmp (gdb_so_name, "/usr/lib/amd64/ld.so.1") == 0 |
159 | && strcmp (inferior_so_name, "/lib/amd64/ld.so.1") == 0) | |
160 | return 1; | |
161 | ||
4d7b2d5b JB |
162 | if (strcmp (gdb_so_name, "/usr/lib/sparcv9/ld.so.1") == 0 |
163 | && strcmp (inferior_so_name, "/lib/sparcv9/ld.so.1") == 0) | |
164 | return 1; | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | static int | |
170 | svr4_same (struct so_list *gdb, struct so_list *inferior) | |
171 | { | |
172 | return (svr4_same_1 (gdb->so_original_name, inferior->so_original_name)); | |
173 | } | |
174 | ||
a7961323 | 175 | static std::unique_ptr<lm_info_svr4> |
3957565a | 176 | lm_info_read (CORE_ADDR lm_addr) |
13437d4b | 177 | { |
4b188b9f | 178 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
a7961323 | 179 | std::unique_ptr<lm_info_svr4> lm_info; |
3957565a | 180 | |
a7961323 | 181 | gdb::byte_vector lm (lmo->link_map_size); |
3957565a | 182 | |
a7961323 TT |
183 | if (target_read_memory (lm_addr, lm.data (), lmo->link_map_size) != 0) |
184 | warning (_("Error reading shared library list entry at %s"), | |
185 | paddress (target_gdbarch (), lm_addr)); | |
3957565a JK |
186 | else |
187 | { | |
f5656ead | 188 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
13437d4b | 189 | |
a7961323 | 190 | lm_info.reset (new lm_info_svr4); |
3957565a JK |
191 | lm_info->lm_addr = lm_addr; |
192 | ||
193 | lm_info->l_addr_inferior = extract_typed_address (&lm[lmo->l_addr_offset], | |
194 | ptr_type); | |
195 | lm_info->l_ld = extract_typed_address (&lm[lmo->l_ld_offset], ptr_type); | |
196 | lm_info->l_next = extract_typed_address (&lm[lmo->l_next_offset], | |
197 | ptr_type); | |
198 | lm_info->l_prev = extract_typed_address (&lm[lmo->l_prev_offset], | |
199 | ptr_type); | |
200 | lm_info->l_name = extract_typed_address (&lm[lmo->l_name_offset], | |
201 | ptr_type); | |
202 | } | |
203 | ||
3957565a | 204 | return lm_info; |
13437d4b KB |
205 | } |
206 | ||
cc10cae3 | 207 | static int |
b23518f0 | 208 | has_lm_dynamic_from_link_map (void) |
cc10cae3 AO |
209 | { |
210 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
211 | ||
cfaefc65 | 212 | return lmo->l_ld_offset >= 0; |
cc10cae3 AO |
213 | } |
214 | ||
cc10cae3 | 215 | static CORE_ADDR |
f65ce5fb | 216 | lm_addr_check (const struct so_list *so, bfd *abfd) |
cc10cae3 | 217 | { |
d0e449a1 SM |
218 | lm_info_svr4 *li = (lm_info_svr4 *) so->lm_info; |
219 | ||
220 | if (!li->l_addr_p) | |
cc10cae3 AO |
221 | { |
222 | struct bfd_section *dyninfo_sect; | |
28f34a8f | 223 | CORE_ADDR l_addr, l_dynaddr, dynaddr; |
cc10cae3 | 224 | |
d0e449a1 | 225 | l_addr = li->l_addr_inferior; |
cc10cae3 | 226 | |
b23518f0 | 227 | if (! abfd || ! has_lm_dynamic_from_link_map ()) |
cc10cae3 AO |
228 | goto set_addr; |
229 | ||
d0e449a1 | 230 | l_dynaddr = li->l_ld; |
cc10cae3 AO |
231 | |
232 | dyninfo_sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
233 | if (dyninfo_sect == NULL) | |
234 | goto set_addr; | |
235 | ||
236 | dynaddr = bfd_section_vma (abfd, dyninfo_sect); | |
237 | ||
238 | if (dynaddr + l_addr != l_dynaddr) | |
239 | { | |
28f34a8f | 240 | CORE_ADDR align = 0x1000; |
4e1fc9c9 | 241 | CORE_ADDR minpagesize = align; |
28f34a8f | 242 | |
cc10cae3 AO |
243 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
244 | { | |
245 | Elf_Internal_Ehdr *ehdr = elf_tdata (abfd)->elf_header; | |
246 | Elf_Internal_Phdr *phdr = elf_tdata (abfd)->phdr; | |
247 | int i; | |
248 | ||
249 | align = 1; | |
250 | ||
251 | for (i = 0; i < ehdr->e_phnum; i++) | |
252 | if (phdr[i].p_type == PT_LOAD && phdr[i].p_align > align) | |
253 | align = phdr[i].p_align; | |
4e1fc9c9 JK |
254 | |
255 | minpagesize = get_elf_backend_data (abfd)->minpagesize; | |
cc10cae3 AO |
256 | } |
257 | ||
258 | /* Turn it into a mask. */ | |
259 | align--; | |
260 | ||
261 | /* If the changes match the alignment requirements, we | |
262 | assume we're using a core file that was generated by the | |
263 | same binary, just prelinked with a different base offset. | |
264 | If it doesn't match, we may have a different binary, the | |
265 | same binary with the dynamic table loaded at an unrelated | |
266 | location, or anything, really. To avoid regressions, | |
267 | don't adjust the base offset in the latter case, although | |
268 | odds are that, if things really changed, debugging won't | |
5c0d192f JK |
269 | quite work. |
270 | ||
271 | One could expect more the condition | |
272 | ((l_addr & align) == 0 && ((l_dynaddr - dynaddr) & align) == 0) | |
273 | but the one below is relaxed for PPC. The PPC kernel supports | |
274 | either 4k or 64k page sizes. To be prepared for 64k pages, | |
275 | PPC ELF files are built using an alignment requirement of 64k. | |
276 | However, when running on a kernel supporting 4k pages, the memory | |
277 | mapping of the library may not actually happen on a 64k boundary! | |
278 | ||
279 | (In the usual case where (l_addr & align) == 0, this check is | |
4e1fc9c9 JK |
280 | equivalent to the possibly expected check above.) |
281 | ||
282 | Even on PPC it must be zero-aligned at least for MINPAGESIZE. */ | |
5c0d192f | 283 | |
02835898 JK |
284 | l_addr = l_dynaddr - dynaddr; |
285 | ||
4e1fc9c9 JK |
286 | if ((l_addr & (minpagesize - 1)) == 0 |
287 | && (l_addr & align) == ((l_dynaddr - dynaddr) & align)) | |
cc10cae3 | 288 | { |
701ed6dc | 289 | if (info_verbose) |
ccf26247 JK |
290 | printf_unfiltered (_("Using PIC (Position Independent Code) " |
291 | "prelink displacement %s for \"%s\".\n"), | |
f5656ead | 292 | paddress (target_gdbarch (), l_addr), |
ccf26247 | 293 | so->so_name); |
cc10cae3 | 294 | } |
79d4c408 | 295 | else |
02835898 JK |
296 | { |
297 | /* There is no way to verify the library file matches. prelink | |
298 | can during prelinking of an unprelinked file (or unprelinking | |
299 | of a prelinked file) shift the DYNAMIC segment by arbitrary | |
300 | offset without any page size alignment. There is no way to | |
301 | find out the ELF header and/or Program Headers for a limited | |
302 | verification if it they match. One could do a verification | |
303 | of the DYNAMIC segment. Still the found address is the best | |
304 | one GDB could find. */ | |
305 | ||
306 | warning (_(".dynamic section for \"%s\" " | |
307 | "is not at the expected address " | |
308 | "(wrong library or version mismatch?)"), so->so_name); | |
309 | } | |
cc10cae3 AO |
310 | } |
311 | ||
312 | set_addr: | |
d0e449a1 SM |
313 | li->l_addr = l_addr; |
314 | li->l_addr_p = 1; | |
cc10cae3 AO |
315 | } |
316 | ||
d0e449a1 | 317 | return li->l_addr; |
cc10cae3 AO |
318 | } |
319 | ||
6c95b8df | 320 | /* Per pspace SVR4 specific data. */ |
13437d4b | 321 | |
1a816a87 PA |
322 | struct svr4_info |
323 | { | |
c378eb4e | 324 | CORE_ADDR debug_base; /* Base of dynamic linker structures. */ |
1a816a87 PA |
325 | |
326 | /* Validity flag for debug_loader_offset. */ | |
327 | int debug_loader_offset_p; | |
328 | ||
329 | /* Load address for the dynamic linker, inferred. */ | |
330 | CORE_ADDR debug_loader_offset; | |
331 | ||
332 | /* Name of the dynamic linker, valid if debug_loader_offset_p. */ | |
333 | char *debug_loader_name; | |
334 | ||
335 | /* Load map address for the main executable. */ | |
336 | CORE_ADDR main_lm_addr; | |
1a816a87 | 337 | |
6c95b8df PA |
338 | CORE_ADDR interp_text_sect_low; |
339 | CORE_ADDR interp_text_sect_high; | |
340 | CORE_ADDR interp_plt_sect_low; | |
341 | CORE_ADDR interp_plt_sect_high; | |
f9e14852 GB |
342 | |
343 | /* Nonzero if the list of objects was last obtained from the target | |
344 | via qXfer:libraries-svr4:read. */ | |
345 | int using_xfer; | |
346 | ||
347 | /* Table of struct probe_and_action instances, used by the | |
348 | probes-based interface to map breakpoint addresses to probes | |
349 | and their associated actions. Lookup is performed using | |
935676c9 | 350 | probe_and_action->prob->address. */ |
f9e14852 GB |
351 | htab_t probes_table; |
352 | ||
353 | /* List of objects loaded into the inferior, used by the probes- | |
354 | based interface. */ | |
355 | struct so_list *solib_list; | |
6c95b8df | 356 | }; |
1a816a87 | 357 | |
6c95b8df PA |
358 | /* Per-program-space data key. */ |
359 | static const struct program_space_data *solib_svr4_pspace_data; | |
1a816a87 | 360 | |
f9e14852 GB |
361 | /* Free the probes table. */ |
362 | ||
363 | static void | |
364 | free_probes_table (struct svr4_info *info) | |
365 | { | |
366 | if (info->probes_table == NULL) | |
367 | return; | |
368 | ||
369 | htab_delete (info->probes_table); | |
370 | info->probes_table = NULL; | |
371 | } | |
372 | ||
373 | /* Free the solib list. */ | |
374 | ||
375 | static void | |
376 | free_solib_list (struct svr4_info *info) | |
377 | { | |
378 | svr4_free_library_list (&info->solib_list); | |
379 | info->solib_list = NULL; | |
380 | } | |
381 | ||
6c95b8df PA |
382 | static void |
383 | svr4_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
1a816a87 | 384 | { |
19ba03f4 | 385 | struct svr4_info *info = (struct svr4_info *) arg; |
f9e14852 GB |
386 | |
387 | free_probes_table (info); | |
388 | free_solib_list (info); | |
389 | ||
6c95b8df | 390 | xfree (info); |
1a816a87 PA |
391 | } |
392 | ||
6c95b8df PA |
393 | /* Get the current svr4 data. If none is found yet, add it now. This |
394 | function always returns a valid object. */ | |
34439770 | 395 | |
6c95b8df PA |
396 | static struct svr4_info * |
397 | get_svr4_info (void) | |
1a816a87 | 398 | { |
6c95b8df | 399 | struct svr4_info *info; |
1a816a87 | 400 | |
19ba03f4 SM |
401 | info = (struct svr4_info *) program_space_data (current_program_space, |
402 | solib_svr4_pspace_data); | |
6c95b8df PA |
403 | if (info != NULL) |
404 | return info; | |
34439770 | 405 | |
41bf6aca | 406 | info = XCNEW (struct svr4_info); |
6c95b8df PA |
407 | set_program_space_data (current_program_space, solib_svr4_pspace_data, info); |
408 | return info; | |
1a816a87 | 409 | } |
93a57060 | 410 | |
13437d4b KB |
411 | /* Local function prototypes */ |
412 | ||
bc043ef3 | 413 | static int match_main (const char *); |
13437d4b | 414 | |
97ec2c2f | 415 | /* Read program header TYPE from inferior memory. The header is found |
17658d46 | 416 | by scanning the OS auxiliary vector. |
97ec2c2f | 417 | |
09919ac2 JK |
418 | If TYPE == -1, return the program headers instead of the contents of |
419 | one program header. | |
420 | ||
17658d46 SM |
421 | Return vector of bytes holding the program header contents, or an empty |
422 | optional on failure. If successful and P_ARCH_SIZE is non-NULL, the target | |
423 | architecture size (32-bit or 64-bit) is returned to *P_ARCH_SIZE. Likewise, | |
424 | the base address of the section is returned in *BASE_ADDR. */ | |
97ec2c2f | 425 | |
17658d46 SM |
426 | static gdb::optional<gdb::byte_vector> |
427 | read_program_header (int type, int *p_arch_size, CORE_ADDR *base_addr) | |
97ec2c2f | 428 | { |
f5656ead | 429 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
43136979 | 430 | CORE_ADDR at_phdr, at_phent, at_phnum, pt_phdr = 0; |
97ec2c2f UW |
431 | int arch_size, sect_size; |
432 | CORE_ADDR sect_addr; | |
43136979 | 433 | int pt_phdr_p = 0; |
97ec2c2f UW |
434 | |
435 | /* Get required auxv elements from target. */ | |
8b88a78e | 436 | if (target_auxv_search (current_top_target (), AT_PHDR, &at_phdr) <= 0) |
17658d46 | 437 | return {}; |
8b88a78e | 438 | if (target_auxv_search (current_top_target (), AT_PHENT, &at_phent) <= 0) |
17658d46 | 439 | return {}; |
8b88a78e | 440 | if (target_auxv_search (current_top_target (), AT_PHNUM, &at_phnum) <= 0) |
17658d46 | 441 | return {}; |
97ec2c2f | 442 | if (!at_phdr || !at_phnum) |
17658d46 | 443 | return {}; |
97ec2c2f UW |
444 | |
445 | /* Determine ELF architecture type. */ | |
446 | if (at_phent == sizeof (Elf32_External_Phdr)) | |
447 | arch_size = 32; | |
448 | else if (at_phent == sizeof (Elf64_External_Phdr)) | |
449 | arch_size = 64; | |
450 | else | |
17658d46 | 451 | return {}; |
97ec2c2f | 452 | |
09919ac2 JK |
453 | /* Find the requested segment. */ |
454 | if (type == -1) | |
455 | { | |
456 | sect_addr = at_phdr; | |
457 | sect_size = at_phent * at_phnum; | |
458 | } | |
459 | else if (arch_size == 32) | |
97ec2c2f UW |
460 | { |
461 | Elf32_External_Phdr phdr; | |
462 | int i; | |
463 | ||
464 | /* Search for requested PHDR. */ | |
465 | for (i = 0; i < at_phnum; i++) | |
466 | { | |
43136979 AR |
467 | int p_type; |
468 | ||
97ec2c2f UW |
469 | if (target_read_memory (at_phdr + i * sizeof (phdr), |
470 | (gdb_byte *)&phdr, sizeof (phdr))) | |
17658d46 | 471 | return {}; |
97ec2c2f | 472 | |
43136979 AR |
473 | p_type = extract_unsigned_integer ((gdb_byte *) phdr.p_type, |
474 | 4, byte_order); | |
475 | ||
476 | if (p_type == PT_PHDR) | |
477 | { | |
478 | pt_phdr_p = 1; | |
479 | pt_phdr = extract_unsigned_integer ((gdb_byte *) phdr.p_vaddr, | |
480 | 4, byte_order); | |
481 | } | |
482 | ||
483 | if (p_type == type) | |
97ec2c2f UW |
484 | break; |
485 | } | |
486 | ||
487 | if (i == at_phnum) | |
17658d46 | 488 | return {}; |
97ec2c2f UW |
489 | |
490 | /* Retrieve address and size. */ | |
e17a4113 UW |
491 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
492 | 4, byte_order); | |
493 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
494 | 4, byte_order); | |
97ec2c2f UW |
495 | } |
496 | else | |
497 | { | |
498 | Elf64_External_Phdr phdr; | |
499 | int i; | |
500 | ||
501 | /* Search for requested PHDR. */ | |
502 | for (i = 0; i < at_phnum; i++) | |
503 | { | |
43136979 AR |
504 | int p_type; |
505 | ||
97ec2c2f UW |
506 | if (target_read_memory (at_phdr + i * sizeof (phdr), |
507 | (gdb_byte *)&phdr, sizeof (phdr))) | |
17658d46 | 508 | return {}; |
97ec2c2f | 509 | |
43136979 AR |
510 | p_type = extract_unsigned_integer ((gdb_byte *) phdr.p_type, |
511 | 4, byte_order); | |
512 | ||
513 | if (p_type == PT_PHDR) | |
514 | { | |
515 | pt_phdr_p = 1; | |
516 | pt_phdr = extract_unsigned_integer ((gdb_byte *) phdr.p_vaddr, | |
517 | 8, byte_order); | |
518 | } | |
519 | ||
520 | if (p_type == type) | |
97ec2c2f UW |
521 | break; |
522 | } | |
523 | ||
524 | if (i == at_phnum) | |
17658d46 | 525 | return {}; |
97ec2c2f UW |
526 | |
527 | /* Retrieve address and size. */ | |
e17a4113 UW |
528 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
529 | 8, byte_order); | |
530 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
531 | 8, byte_order); | |
97ec2c2f UW |
532 | } |
533 | ||
43136979 AR |
534 | /* PT_PHDR is optional, but we really need it |
535 | for PIE to make this work in general. */ | |
536 | ||
537 | if (pt_phdr_p) | |
538 | { | |
539 | /* at_phdr is real address in memory. pt_phdr is what pheader says it is. | |
540 | Relocation offset is the difference between the two. */ | |
541 | sect_addr = sect_addr + (at_phdr - pt_phdr); | |
542 | } | |
543 | ||
97ec2c2f | 544 | /* Read in requested program header. */ |
17658d46 SM |
545 | gdb::byte_vector buf (sect_size); |
546 | if (target_read_memory (sect_addr, buf.data (), sect_size)) | |
547 | return {}; | |
97ec2c2f UW |
548 | |
549 | if (p_arch_size) | |
550 | *p_arch_size = arch_size; | |
a738da3a MF |
551 | if (base_addr) |
552 | *base_addr = sect_addr; | |
97ec2c2f UW |
553 | |
554 | return buf; | |
555 | } | |
556 | ||
557 | ||
558 | /* Return program interpreter string. */ | |
17658d46 | 559 | static gdb::optional<gdb::byte_vector> |
97ec2c2f UW |
560 | find_program_interpreter (void) |
561 | { | |
97ec2c2f UW |
562 | /* If we have an exec_bfd, use its section table. */ |
563 | if (exec_bfd | |
564 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
565 | { | |
566 | struct bfd_section *interp_sect; | |
567 | ||
568 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
569 | if (interp_sect != NULL) | |
570 | { | |
97ec2c2f UW |
571 | int sect_size = bfd_section_size (exec_bfd, interp_sect); |
572 | ||
17658d46 SM |
573 | gdb::byte_vector buf (sect_size); |
574 | bfd_get_section_contents (exec_bfd, interp_sect, buf.data (), 0, | |
575 | sect_size); | |
576 | return buf; | |
97ec2c2f UW |
577 | } |
578 | } | |
579 | ||
17658d46 SM |
580 | /* If we didn't find it, use the target auxiliary vector. */ |
581 | return read_program_header (PT_INTERP, NULL, NULL); | |
97ec2c2f UW |
582 | } |
583 | ||
584 | ||
b6d7a4bf SM |
585 | /* Scan for DESIRED_DYNTAG in .dynamic section of ABFD. If DESIRED_DYNTAG is |
586 | found, 1 is returned and the corresponding PTR is set. */ | |
3a40aaa0 UW |
587 | |
588 | static int | |
a738da3a MF |
589 | scan_dyntag (const int desired_dyntag, bfd *abfd, CORE_ADDR *ptr, |
590 | CORE_ADDR *ptr_addr) | |
3a40aaa0 UW |
591 | { |
592 | int arch_size, step, sect_size; | |
b6d7a4bf | 593 | long current_dyntag; |
b381ea14 | 594 | CORE_ADDR dyn_ptr, dyn_addr; |
65728c26 | 595 | gdb_byte *bufend, *bufstart, *buf; |
3a40aaa0 UW |
596 | Elf32_External_Dyn *x_dynp_32; |
597 | Elf64_External_Dyn *x_dynp_64; | |
598 | struct bfd_section *sect; | |
61f0d762 | 599 | struct target_section *target_section; |
3a40aaa0 UW |
600 | |
601 | if (abfd == NULL) | |
602 | return 0; | |
0763ab81 PA |
603 | |
604 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
605 | return 0; | |
606 | ||
3a40aaa0 UW |
607 | arch_size = bfd_get_arch_size (abfd); |
608 | if (arch_size == -1) | |
0763ab81 | 609 | return 0; |
3a40aaa0 UW |
610 | |
611 | /* Find the start address of the .dynamic section. */ | |
612 | sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
613 | if (sect == NULL) | |
614 | return 0; | |
61f0d762 JK |
615 | |
616 | for (target_section = current_target_sections->sections; | |
617 | target_section < current_target_sections->sections_end; | |
618 | target_section++) | |
619 | if (sect == target_section->the_bfd_section) | |
620 | break; | |
b381ea14 JK |
621 | if (target_section < current_target_sections->sections_end) |
622 | dyn_addr = target_section->addr; | |
623 | else | |
624 | { | |
625 | /* ABFD may come from OBJFILE acting only as a symbol file without being | |
626 | loaded into the target (see add_symbol_file_command). This case is | |
627 | such fallback to the file VMA address without the possibility of | |
628 | having the section relocated to its actual in-memory address. */ | |
629 | ||
630 | dyn_addr = bfd_section_vma (abfd, sect); | |
631 | } | |
3a40aaa0 | 632 | |
65728c26 DJ |
633 | /* Read in .dynamic from the BFD. We will get the actual value |
634 | from memory later. */ | |
3a40aaa0 | 635 | sect_size = bfd_section_size (abfd, sect); |
224c3ddb | 636 | buf = bufstart = (gdb_byte *) alloca (sect_size); |
65728c26 DJ |
637 | if (!bfd_get_section_contents (abfd, sect, |
638 | buf, 0, sect_size)) | |
639 | return 0; | |
3a40aaa0 UW |
640 | |
641 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
642 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
643 | : sizeof (Elf64_External_Dyn); | |
644 | for (bufend = buf + sect_size; | |
645 | buf < bufend; | |
646 | buf += step) | |
647 | { | |
648 | if (arch_size == 32) | |
649 | { | |
650 | x_dynp_32 = (Elf32_External_Dyn *) buf; | |
b6d7a4bf | 651 | current_dyntag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag); |
3a40aaa0 UW |
652 | dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr); |
653 | } | |
65728c26 | 654 | else |
3a40aaa0 UW |
655 | { |
656 | x_dynp_64 = (Elf64_External_Dyn *) buf; | |
b6d7a4bf | 657 | current_dyntag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag); |
3a40aaa0 UW |
658 | dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr); |
659 | } | |
b6d7a4bf | 660 | if (current_dyntag == DT_NULL) |
3a40aaa0 | 661 | return 0; |
b6d7a4bf | 662 | if (current_dyntag == desired_dyntag) |
3a40aaa0 | 663 | { |
65728c26 DJ |
664 | /* If requested, try to read the runtime value of this .dynamic |
665 | entry. */ | |
3a40aaa0 | 666 | if (ptr) |
65728c26 | 667 | { |
b6da22b0 | 668 | struct type *ptr_type; |
65728c26 | 669 | gdb_byte ptr_buf[8]; |
a738da3a | 670 | CORE_ADDR ptr_addr_1; |
65728c26 | 671 | |
f5656ead | 672 | ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
a738da3a MF |
673 | ptr_addr_1 = dyn_addr + (buf - bufstart) + arch_size / 8; |
674 | if (target_read_memory (ptr_addr_1, ptr_buf, arch_size / 8) == 0) | |
b6da22b0 | 675 | dyn_ptr = extract_typed_address (ptr_buf, ptr_type); |
65728c26 | 676 | *ptr = dyn_ptr; |
a738da3a MF |
677 | if (ptr_addr) |
678 | *ptr_addr = dyn_addr + (buf - bufstart); | |
65728c26 DJ |
679 | } |
680 | return 1; | |
3a40aaa0 UW |
681 | } |
682 | } | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
b6d7a4bf SM |
687 | /* Scan for DESIRED_DYNTAG in .dynamic section of the target's main executable, |
688 | found by consulting the OS auxillary vector. If DESIRED_DYNTAG is found, 1 | |
689 | is returned and the corresponding PTR is set. */ | |
97ec2c2f UW |
690 | |
691 | static int | |
a738da3a MF |
692 | scan_dyntag_auxv (const int desired_dyntag, CORE_ADDR *ptr, |
693 | CORE_ADDR *ptr_addr) | |
97ec2c2f | 694 | { |
f5656ead | 695 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
17658d46 | 696 | int arch_size, step; |
b6d7a4bf | 697 | long current_dyntag; |
97ec2c2f | 698 | CORE_ADDR dyn_ptr; |
a738da3a | 699 | CORE_ADDR base_addr; |
97ec2c2f UW |
700 | |
701 | /* Read in .dynamic section. */ | |
17658d46 SM |
702 | gdb::optional<gdb::byte_vector> ph_data |
703 | = read_program_header (PT_DYNAMIC, &arch_size, &base_addr); | |
704 | if (!ph_data) | |
97ec2c2f UW |
705 | return 0; |
706 | ||
707 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
708 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
709 | : sizeof (Elf64_External_Dyn); | |
17658d46 SM |
710 | for (gdb_byte *buf = ph_data->data (), *bufend = buf + ph_data->size (); |
711 | buf < bufend; buf += step) | |
97ec2c2f UW |
712 | { |
713 | if (arch_size == 32) | |
714 | { | |
715 | Elf32_External_Dyn *dynp = (Elf32_External_Dyn *) buf; | |
433759f7 | 716 | |
b6d7a4bf | 717 | current_dyntag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
e17a4113 UW |
718 | 4, byte_order); |
719 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
720 | 4, byte_order); | |
97ec2c2f UW |
721 | } |
722 | else | |
723 | { | |
724 | Elf64_External_Dyn *dynp = (Elf64_External_Dyn *) buf; | |
433759f7 | 725 | |
b6d7a4bf | 726 | current_dyntag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
e17a4113 UW |
727 | 8, byte_order); |
728 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
729 | 8, byte_order); | |
97ec2c2f | 730 | } |
b6d7a4bf | 731 | if (current_dyntag == DT_NULL) |
97ec2c2f UW |
732 | break; |
733 | ||
b6d7a4bf | 734 | if (current_dyntag == desired_dyntag) |
97ec2c2f UW |
735 | { |
736 | if (ptr) | |
737 | *ptr = dyn_ptr; | |
738 | ||
a738da3a | 739 | if (ptr_addr) |
17658d46 | 740 | *ptr_addr = base_addr + buf - ph_data->data (); |
a738da3a | 741 | |
97ec2c2f UW |
742 | return 1; |
743 | } | |
744 | } | |
745 | ||
97ec2c2f UW |
746 | return 0; |
747 | } | |
748 | ||
7f86f058 PA |
749 | /* Locate the base address of dynamic linker structs for SVR4 elf |
750 | targets. | |
13437d4b KB |
751 | |
752 | For SVR4 elf targets the address of the dynamic linker's runtime | |
753 | structure is contained within the dynamic info section in the | |
754 | executable file. The dynamic section is also mapped into the | |
755 | inferior address space. Because the runtime loader fills in the | |
756 | real address before starting the inferior, we have to read in the | |
757 | dynamic info section from the inferior address space. | |
758 | If there are any errors while trying to find the address, we | |
7f86f058 | 759 | silently return 0, otherwise the found address is returned. */ |
13437d4b KB |
760 | |
761 | static CORE_ADDR | |
762 | elf_locate_base (void) | |
763 | { | |
3b7344d5 | 764 | struct bound_minimal_symbol msymbol; |
a738da3a | 765 | CORE_ADDR dyn_ptr, dyn_ptr_addr; |
13437d4b | 766 | |
65728c26 DJ |
767 | /* Look for DT_MIPS_RLD_MAP first. MIPS executables use this |
768 | instead of DT_DEBUG, although they sometimes contain an unused | |
769 | DT_DEBUG. */ | |
a738da3a MF |
770 | if (scan_dyntag (DT_MIPS_RLD_MAP, exec_bfd, &dyn_ptr, NULL) |
771 | || scan_dyntag_auxv (DT_MIPS_RLD_MAP, &dyn_ptr, NULL)) | |
3a40aaa0 | 772 | { |
f5656ead | 773 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
3a40aaa0 | 774 | gdb_byte *pbuf; |
b6da22b0 | 775 | int pbuf_size = TYPE_LENGTH (ptr_type); |
433759f7 | 776 | |
224c3ddb | 777 | pbuf = (gdb_byte *) alloca (pbuf_size); |
3a40aaa0 UW |
778 | /* DT_MIPS_RLD_MAP contains a pointer to the address |
779 | of the dynamic link structure. */ | |
780 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) | |
e499d0f1 | 781 | return 0; |
b6da22b0 | 782 | return extract_typed_address (pbuf, ptr_type); |
e499d0f1 DJ |
783 | } |
784 | ||
a738da3a MF |
785 | /* Then check DT_MIPS_RLD_MAP_REL. MIPS executables now use this form |
786 | because of needing to support PIE. DT_MIPS_RLD_MAP will also exist | |
787 | in non-PIE. */ | |
788 | if (scan_dyntag (DT_MIPS_RLD_MAP_REL, exec_bfd, &dyn_ptr, &dyn_ptr_addr) | |
789 | || scan_dyntag_auxv (DT_MIPS_RLD_MAP_REL, &dyn_ptr, &dyn_ptr_addr)) | |
790 | { | |
791 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
792 | gdb_byte *pbuf; | |
793 | int pbuf_size = TYPE_LENGTH (ptr_type); | |
794 | ||
224c3ddb | 795 | pbuf = (gdb_byte *) alloca (pbuf_size); |
a738da3a MF |
796 | /* DT_MIPS_RLD_MAP_REL contains an offset from the address of the |
797 | DT slot to the address of the dynamic link structure. */ | |
798 | if (target_read_memory (dyn_ptr + dyn_ptr_addr, pbuf, pbuf_size)) | |
799 | return 0; | |
800 | return extract_typed_address (pbuf, ptr_type); | |
801 | } | |
802 | ||
65728c26 | 803 | /* Find DT_DEBUG. */ |
a738da3a MF |
804 | if (scan_dyntag (DT_DEBUG, exec_bfd, &dyn_ptr, NULL) |
805 | || scan_dyntag_auxv (DT_DEBUG, &dyn_ptr, NULL)) | |
65728c26 DJ |
806 | return dyn_ptr; |
807 | ||
3a40aaa0 UW |
808 | /* This may be a static executable. Look for the symbol |
809 | conventionally named _r_debug, as a last resort. */ | |
810 | msymbol = lookup_minimal_symbol ("_r_debug", NULL, symfile_objfile); | |
3b7344d5 | 811 | if (msymbol.minsym != NULL) |
77e371c0 | 812 | return BMSYMBOL_VALUE_ADDRESS (msymbol); |
13437d4b KB |
813 | |
814 | /* DT_DEBUG entry not found. */ | |
815 | return 0; | |
816 | } | |
817 | ||
7f86f058 | 818 | /* Locate the base address of dynamic linker structs. |
13437d4b KB |
819 | |
820 | For both the SunOS and SVR4 shared library implementations, if the | |
821 | inferior executable has been linked dynamically, there is a single | |
822 | address somewhere in the inferior's data space which is the key to | |
823 | locating all of the dynamic linker's runtime structures. This | |
824 | address is the value of the debug base symbol. The job of this | |
825 | function is to find and return that address, or to return 0 if there | |
826 | is no such address (the executable is statically linked for example). | |
827 | ||
828 | For SunOS, the job is almost trivial, since the dynamic linker and | |
829 | all of it's structures are statically linked to the executable at | |
830 | link time. Thus the symbol for the address we are looking for has | |
831 | already been added to the minimal symbol table for the executable's | |
832 | objfile at the time the symbol file's symbols were read, and all we | |
833 | have to do is look it up there. Note that we explicitly do NOT want | |
834 | to find the copies in the shared library. | |
835 | ||
836 | The SVR4 version is a bit more complicated because the address | |
837 | is contained somewhere in the dynamic info section. We have to go | |
838 | to a lot more work to discover the address of the debug base symbol. | |
839 | Because of this complexity, we cache the value we find and return that | |
840 | value on subsequent invocations. Note there is no copy in the | |
7f86f058 | 841 | executable symbol tables. */ |
13437d4b KB |
842 | |
843 | static CORE_ADDR | |
1a816a87 | 844 | locate_base (struct svr4_info *info) |
13437d4b | 845 | { |
13437d4b KB |
846 | /* Check to see if we have a currently valid address, and if so, avoid |
847 | doing all this work again and just return the cached address. If | |
848 | we have no cached address, try to locate it in the dynamic info | |
d5a921c9 KB |
849 | section for ELF executables. There's no point in doing any of this |
850 | though if we don't have some link map offsets to work with. */ | |
13437d4b | 851 | |
1a816a87 | 852 | if (info->debug_base == 0 && svr4_have_link_map_offsets ()) |
0763ab81 | 853 | info->debug_base = elf_locate_base (); |
1a816a87 | 854 | return info->debug_base; |
13437d4b KB |
855 | } |
856 | ||
e4cd0d6a | 857 | /* Find the first element in the inferior's dynamic link map, and |
6f992fbf JB |
858 | return its address in the inferior. Return zero if the address |
859 | could not be determined. | |
13437d4b | 860 | |
e4cd0d6a MK |
861 | FIXME: Perhaps we should validate the info somehow, perhaps by |
862 | checking r_version for a known version number, or r_state for | |
863 | RT_CONSISTENT. */ | |
13437d4b KB |
864 | |
865 | static CORE_ADDR | |
1a816a87 | 866 | solib_svr4_r_map (struct svr4_info *info) |
13437d4b | 867 | { |
4b188b9f | 868 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f5656ead | 869 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
08597104 | 870 | CORE_ADDR addr = 0; |
13437d4b | 871 | |
a70b8144 | 872 | try |
08597104 JB |
873 | { |
874 | addr = read_memory_typed_address (info->debug_base + lmo->r_map_offset, | |
875 | ptr_type); | |
876 | } | |
230d2906 | 877 | catch (const gdb_exception_error &ex) |
492d29ea PA |
878 | { |
879 | exception_print (gdb_stderr, ex); | |
880 | } | |
492d29ea | 881 | |
08597104 | 882 | return addr; |
e4cd0d6a | 883 | } |
13437d4b | 884 | |
7cd25cfc DJ |
885 | /* Find r_brk from the inferior's debug base. */ |
886 | ||
887 | static CORE_ADDR | |
1a816a87 | 888 | solib_svr4_r_brk (struct svr4_info *info) |
7cd25cfc DJ |
889 | { |
890 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
f5656ead | 891 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
7cd25cfc | 892 | |
1a816a87 PA |
893 | return read_memory_typed_address (info->debug_base + lmo->r_brk_offset, |
894 | ptr_type); | |
7cd25cfc DJ |
895 | } |
896 | ||
e4cd0d6a MK |
897 | /* Find the link map for the dynamic linker (if it is not in the |
898 | normal list of loaded shared objects). */ | |
13437d4b | 899 | |
e4cd0d6a | 900 | static CORE_ADDR |
1a816a87 | 901 | solib_svr4_r_ldsomap (struct svr4_info *info) |
e4cd0d6a MK |
902 | { |
903 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
f5656ead TT |
904 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
905 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); | |
416f679e SDJ |
906 | ULONGEST version = 0; |
907 | ||
a70b8144 | 908 | try |
416f679e SDJ |
909 | { |
910 | /* Check version, and return zero if `struct r_debug' doesn't have | |
911 | the r_ldsomap member. */ | |
912 | version | |
913 | = read_memory_unsigned_integer (info->debug_base + lmo->r_version_offset, | |
914 | lmo->r_version_size, byte_order); | |
915 | } | |
230d2906 | 916 | catch (const gdb_exception_error &ex) |
416f679e SDJ |
917 | { |
918 | exception_print (gdb_stderr, ex); | |
919 | } | |
13437d4b | 920 | |
e4cd0d6a MK |
921 | if (version < 2 || lmo->r_ldsomap_offset == -1) |
922 | return 0; | |
13437d4b | 923 | |
1a816a87 | 924 | return read_memory_typed_address (info->debug_base + lmo->r_ldsomap_offset, |
b6da22b0 | 925 | ptr_type); |
13437d4b KB |
926 | } |
927 | ||
de18c1d8 JM |
928 | /* On Solaris systems with some versions of the dynamic linker, |
929 | ld.so's l_name pointer points to the SONAME in the string table | |
930 | rather than into writable memory. So that GDB can find shared | |
931 | libraries when loading a core file generated by gcore, ensure that | |
932 | memory areas containing the l_name string are saved in the core | |
933 | file. */ | |
934 | ||
935 | static int | |
936 | svr4_keep_data_in_core (CORE_ADDR vaddr, unsigned long size) | |
937 | { | |
938 | struct svr4_info *info; | |
939 | CORE_ADDR ldsomap; | |
74de0234 | 940 | CORE_ADDR name_lm; |
de18c1d8 JM |
941 | |
942 | info = get_svr4_info (); | |
943 | ||
944 | info->debug_base = 0; | |
945 | locate_base (info); | |
946 | if (!info->debug_base) | |
947 | return 0; | |
948 | ||
949 | ldsomap = solib_svr4_r_ldsomap (info); | |
950 | if (!ldsomap) | |
951 | return 0; | |
952 | ||
a7961323 | 953 | std::unique_ptr<lm_info_svr4> li = lm_info_read (ldsomap); |
d0e449a1 | 954 | name_lm = li != NULL ? li->l_name : 0; |
de18c1d8 | 955 | |
74de0234 | 956 | return (name_lm >= vaddr && name_lm < vaddr + size); |
de18c1d8 JM |
957 | } |
958 | ||
bf469271 | 959 | /* See solist.h. */ |
13437d4b KB |
960 | |
961 | static int | |
bf469271 | 962 | open_symbol_file_object (int from_tty) |
13437d4b KB |
963 | { |
964 | CORE_ADDR lm, l_name; | |
e83e4e24 | 965 | gdb::unique_xmalloc_ptr<char> filename; |
13437d4b | 966 | int errcode; |
4b188b9f | 967 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f5656ead | 968 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
b6da22b0 | 969 | int l_name_size = TYPE_LENGTH (ptr_type); |
a7961323 | 970 | gdb::byte_vector l_name_buf (l_name_size); |
6c95b8df | 971 | struct svr4_info *info = get_svr4_info (); |
ecf45d2c SL |
972 | symfile_add_flags add_flags = 0; |
973 | ||
974 | if (from_tty) | |
975 | add_flags |= SYMFILE_VERBOSE; | |
13437d4b KB |
976 | |
977 | if (symfile_objfile) | |
9e2f0ad4 | 978 | if (!query (_("Attempt to reload symbols from process? "))) |
a7961323 | 979 | return 0; |
13437d4b | 980 | |
7cd25cfc | 981 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
982 | info->debug_base = 0; |
983 | if (locate_base (info) == 0) | |
a7961323 | 984 | return 0; /* failed somehow... */ |
13437d4b KB |
985 | |
986 | /* First link map member should be the executable. */ | |
1a816a87 | 987 | lm = solib_svr4_r_map (info); |
e4cd0d6a | 988 | if (lm == 0) |
a7961323 | 989 | return 0; /* failed somehow... */ |
13437d4b KB |
990 | |
991 | /* Read address of name from target memory to GDB. */ | |
a7961323 | 992 | read_memory (lm + lmo->l_name_offset, l_name_buf.data (), l_name_size); |
13437d4b | 993 | |
cfaefc65 | 994 | /* Convert the address to host format. */ |
a7961323 | 995 | l_name = extract_typed_address (l_name_buf.data (), ptr_type); |
13437d4b | 996 | |
13437d4b | 997 | if (l_name == 0) |
a7961323 | 998 | return 0; /* No filename. */ |
13437d4b KB |
999 | |
1000 | /* Now fetch the filename from target memory. */ | |
1001 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
1002 | ||
1003 | if (errcode) | |
1004 | { | |
8a3fe4f8 | 1005 | warning (_("failed to read exec filename from attached file: %s"), |
13437d4b KB |
1006 | safe_strerror (errcode)); |
1007 | return 0; | |
1008 | } | |
1009 | ||
13437d4b | 1010 | /* Have a pathname: read the symbol file. */ |
e83e4e24 | 1011 | symbol_file_add_main (filename.get (), add_flags); |
13437d4b KB |
1012 | |
1013 | return 1; | |
1014 | } | |
13437d4b | 1015 | |
2268b414 JK |
1016 | /* Data exchange structure for the XML parser as returned by |
1017 | svr4_current_sos_via_xfer_libraries. */ | |
1018 | ||
1019 | struct svr4_library_list | |
1020 | { | |
1021 | struct so_list *head, **tailp; | |
1022 | ||
1023 | /* Inferior address of struct link_map used for the main executable. It is | |
1024 | NULL if not known. */ | |
1025 | CORE_ADDR main_lm; | |
1026 | }; | |
1027 | ||
93f2a35e JK |
1028 | /* Implementation for target_so_ops.free_so. */ |
1029 | ||
1030 | static void | |
1031 | svr4_free_so (struct so_list *so) | |
1032 | { | |
76e75227 SM |
1033 | lm_info_svr4 *li = (lm_info_svr4 *) so->lm_info; |
1034 | ||
1035 | delete li; | |
93f2a35e JK |
1036 | } |
1037 | ||
0892cb63 DE |
1038 | /* Implement target_so_ops.clear_so. */ |
1039 | ||
1040 | static void | |
1041 | svr4_clear_so (struct so_list *so) | |
1042 | { | |
d0e449a1 SM |
1043 | lm_info_svr4 *li = (lm_info_svr4 *) so->lm_info; |
1044 | ||
1045 | if (li != NULL) | |
1046 | li->l_addr_p = 0; | |
0892cb63 DE |
1047 | } |
1048 | ||
93f2a35e JK |
1049 | /* Free so_list built so far (called via cleanup). */ |
1050 | ||
1051 | static void | |
1052 | svr4_free_library_list (void *p_list) | |
1053 | { | |
1054 | struct so_list *list = *(struct so_list **) p_list; | |
1055 | ||
1056 | while (list != NULL) | |
1057 | { | |
1058 | struct so_list *next = list->next; | |
1059 | ||
3756ef7e | 1060 | free_so (list); |
93f2a35e JK |
1061 | list = next; |
1062 | } | |
1063 | } | |
1064 | ||
f9e14852 GB |
1065 | /* Copy library list. */ |
1066 | ||
1067 | static struct so_list * | |
1068 | svr4_copy_library_list (struct so_list *src) | |
1069 | { | |
1070 | struct so_list *dst = NULL; | |
1071 | struct so_list **link = &dst; | |
1072 | ||
1073 | while (src != NULL) | |
1074 | { | |
fe978cb0 | 1075 | struct so_list *newobj; |
f9e14852 | 1076 | |
8d749320 | 1077 | newobj = XNEW (struct so_list); |
fe978cb0 | 1078 | memcpy (newobj, src, sizeof (struct so_list)); |
f9e14852 | 1079 | |
76e75227 SM |
1080 | lm_info_svr4 *src_li = (lm_info_svr4 *) src->lm_info; |
1081 | newobj->lm_info = new lm_info_svr4 (*src_li); | |
f9e14852 | 1082 | |
fe978cb0 PA |
1083 | newobj->next = NULL; |
1084 | *link = newobj; | |
1085 | link = &newobj->next; | |
f9e14852 GB |
1086 | |
1087 | src = src->next; | |
1088 | } | |
1089 | ||
1090 | return dst; | |
1091 | } | |
1092 | ||
2268b414 JK |
1093 | #ifdef HAVE_LIBEXPAT |
1094 | ||
1095 | #include "xml-support.h" | |
1096 | ||
1097 | /* Handle the start of a <library> element. Note: new elements are added | |
1098 | at the tail of the list, keeping the list in order. */ | |
1099 | ||
1100 | static void | |
1101 | library_list_start_library (struct gdb_xml_parser *parser, | |
1102 | const struct gdb_xml_element *element, | |
4d0fdd9b SM |
1103 | void *user_data, |
1104 | std::vector<gdb_xml_value> &attributes) | |
2268b414 | 1105 | { |
19ba03f4 SM |
1106 | struct svr4_library_list *list = (struct svr4_library_list *) user_data; |
1107 | const char *name | |
4d0fdd9b | 1108 | = (const char *) xml_find_attribute (attributes, "name")->value.get (); |
19ba03f4 | 1109 | ULONGEST *lmp |
4d0fdd9b | 1110 | = (ULONGEST *) xml_find_attribute (attributes, "lm")->value.get (); |
19ba03f4 | 1111 | ULONGEST *l_addrp |
4d0fdd9b | 1112 | = (ULONGEST *) xml_find_attribute (attributes, "l_addr")->value.get (); |
19ba03f4 | 1113 | ULONGEST *l_ldp |
4d0fdd9b | 1114 | = (ULONGEST *) xml_find_attribute (attributes, "l_ld")->value.get (); |
2268b414 JK |
1115 | struct so_list *new_elem; |
1116 | ||
41bf6aca | 1117 | new_elem = XCNEW (struct so_list); |
76e75227 | 1118 | lm_info_svr4 *li = new lm_info_svr4; |
d0e449a1 SM |
1119 | new_elem->lm_info = li; |
1120 | li->lm_addr = *lmp; | |
1121 | li->l_addr_inferior = *l_addrp; | |
1122 | li->l_ld = *l_ldp; | |
2268b414 JK |
1123 | |
1124 | strncpy (new_elem->so_name, name, sizeof (new_elem->so_name) - 1); | |
1125 | new_elem->so_name[sizeof (new_elem->so_name) - 1] = 0; | |
1126 | strcpy (new_elem->so_original_name, new_elem->so_name); | |
1127 | ||
1128 | *list->tailp = new_elem; | |
1129 | list->tailp = &new_elem->next; | |
1130 | } | |
1131 | ||
1132 | /* Handle the start of a <library-list-svr4> element. */ | |
1133 | ||
1134 | static void | |
1135 | svr4_library_list_start_list (struct gdb_xml_parser *parser, | |
1136 | const struct gdb_xml_element *element, | |
4d0fdd9b SM |
1137 | void *user_data, |
1138 | std::vector<gdb_xml_value> &attributes) | |
2268b414 | 1139 | { |
19ba03f4 SM |
1140 | struct svr4_library_list *list = (struct svr4_library_list *) user_data; |
1141 | const char *version | |
4d0fdd9b | 1142 | = (const char *) xml_find_attribute (attributes, "version")->value.get (); |
2268b414 JK |
1143 | struct gdb_xml_value *main_lm = xml_find_attribute (attributes, "main-lm"); |
1144 | ||
1145 | if (strcmp (version, "1.0") != 0) | |
1146 | gdb_xml_error (parser, | |
1147 | _("SVR4 Library list has unsupported version \"%s\""), | |
1148 | version); | |
1149 | ||
1150 | if (main_lm) | |
4d0fdd9b | 1151 | list->main_lm = *(ULONGEST *) main_lm->value.get (); |
2268b414 JK |
1152 | } |
1153 | ||
1154 | /* The allowed elements and attributes for an XML library list. | |
1155 | The root element is a <library-list>. */ | |
1156 | ||
1157 | static const struct gdb_xml_attribute svr4_library_attributes[] = | |
1158 | { | |
1159 | { "name", GDB_XML_AF_NONE, NULL, NULL }, | |
1160 | { "lm", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
1161 | { "l_addr", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
1162 | { "l_ld", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
1163 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
1164 | }; | |
1165 | ||
1166 | static const struct gdb_xml_element svr4_library_list_children[] = | |
1167 | { | |
1168 | { | |
1169 | "library", svr4_library_attributes, NULL, | |
1170 | GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, | |
1171 | library_list_start_library, NULL | |
1172 | }, | |
1173 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
1174 | }; | |
1175 | ||
1176 | static const struct gdb_xml_attribute svr4_library_list_attributes[] = | |
1177 | { | |
1178 | { "version", GDB_XML_AF_NONE, NULL, NULL }, | |
1179 | { "main-lm", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL }, | |
1180 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
1181 | }; | |
1182 | ||
1183 | static const struct gdb_xml_element svr4_library_list_elements[] = | |
1184 | { | |
1185 | { "library-list-svr4", svr4_library_list_attributes, svr4_library_list_children, | |
1186 | GDB_XML_EF_NONE, svr4_library_list_start_list, NULL }, | |
1187 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
1188 | }; | |
1189 | ||
2268b414 JK |
1190 | /* Parse qXfer:libraries:read packet into *SO_LIST_RETURN. Return 1 if |
1191 | ||
1192 | Return 0 if packet not supported, *SO_LIST_RETURN is not modified in such | |
1193 | case. Return 1 if *SO_LIST_RETURN contains the library list, it may be | |
1194 | empty, caller is responsible for freeing all its entries. */ | |
1195 | ||
1196 | static int | |
1197 | svr4_parse_libraries (const char *document, struct svr4_library_list *list) | |
1198 | { | |
2b6ff1c0 TT |
1199 | auto cleanup = make_scope_exit ([&] () |
1200 | { | |
1201 | svr4_free_library_list (&list->head); | |
1202 | }); | |
2268b414 JK |
1203 | |
1204 | memset (list, 0, sizeof (*list)); | |
1205 | list->tailp = &list->head; | |
2eca4a8d | 1206 | if (gdb_xml_parse_quick (_("target library list"), "library-list-svr4.dtd", |
2268b414 JK |
1207 | svr4_library_list_elements, document, list) == 0) |
1208 | { | |
1209 | /* Parsed successfully, keep the result. */ | |
2b6ff1c0 | 1210 | cleanup.release (); |
2268b414 JK |
1211 | return 1; |
1212 | } | |
1213 | ||
2268b414 JK |
1214 | return 0; |
1215 | } | |
1216 | ||
f9e14852 | 1217 | /* Attempt to get so_list from target via qXfer:libraries-svr4:read packet. |
2268b414 JK |
1218 | |
1219 | Return 0 if packet not supported, *SO_LIST_RETURN is not modified in such | |
1220 | case. Return 1 if *SO_LIST_RETURN contains the library list, it may be | |
f9e14852 GB |
1221 | empty, caller is responsible for freeing all its entries. |
1222 | ||
1223 | Note that ANNEX must be NULL if the remote does not explicitly allow | |
1224 | qXfer:libraries-svr4:read packets with non-empty annexes. Support for | |
1225 | this can be checked using target_augmented_libraries_svr4_read (). */ | |
2268b414 JK |
1226 | |
1227 | static int | |
f9e14852 GB |
1228 | svr4_current_sos_via_xfer_libraries (struct svr4_library_list *list, |
1229 | const char *annex) | |
2268b414 | 1230 | { |
f9e14852 GB |
1231 | gdb_assert (annex == NULL || target_augmented_libraries_svr4_read ()); |
1232 | ||
2268b414 | 1233 | /* Fetch the list of shared libraries. */ |
9018be22 | 1234 | gdb::optional<gdb::char_vector> svr4_library_document |
8b88a78e | 1235 | = target_read_stralloc (current_top_target (), TARGET_OBJECT_LIBRARIES_SVR4, |
b7b030ad | 1236 | annex); |
9018be22 | 1237 | if (!svr4_library_document) |
2268b414 JK |
1238 | return 0; |
1239 | ||
9018be22 | 1240 | return svr4_parse_libraries (svr4_library_document->data (), list); |
2268b414 JK |
1241 | } |
1242 | ||
1243 | #else | |
1244 | ||
1245 | static int | |
f9e14852 GB |
1246 | svr4_current_sos_via_xfer_libraries (struct svr4_library_list *list, |
1247 | const char *annex) | |
2268b414 JK |
1248 | { |
1249 | return 0; | |
1250 | } | |
1251 | ||
1252 | #endif | |
1253 | ||
34439770 DJ |
1254 | /* If no shared library information is available from the dynamic |
1255 | linker, build a fallback list from other sources. */ | |
1256 | ||
1257 | static struct so_list * | |
1258 | svr4_default_sos (void) | |
1259 | { | |
6c95b8df | 1260 | struct svr4_info *info = get_svr4_info (); |
fe978cb0 | 1261 | struct so_list *newobj; |
1a816a87 | 1262 | |
8e5c319d JK |
1263 | if (!info->debug_loader_offset_p) |
1264 | return NULL; | |
34439770 | 1265 | |
fe978cb0 | 1266 | newobj = XCNEW (struct so_list); |
76e75227 | 1267 | lm_info_svr4 *li = new lm_info_svr4; |
d0e449a1 | 1268 | newobj->lm_info = li; |
34439770 | 1269 | |
3957565a | 1270 | /* Nothing will ever check the other fields if we set l_addr_p. */ |
d0e449a1 SM |
1271 | li->l_addr = info->debug_loader_offset; |
1272 | li->l_addr_p = 1; | |
34439770 | 1273 | |
fe978cb0 PA |
1274 | strncpy (newobj->so_name, info->debug_loader_name, SO_NAME_MAX_PATH_SIZE - 1); |
1275 | newobj->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
1276 | strcpy (newobj->so_original_name, newobj->so_name); | |
34439770 | 1277 | |
fe978cb0 | 1278 | return newobj; |
34439770 DJ |
1279 | } |
1280 | ||
f9e14852 GB |
1281 | /* Read the whole inferior libraries chain starting at address LM. |
1282 | Expect the first entry in the chain's previous entry to be PREV_LM. | |
1283 | Add the entries to the tail referenced by LINK_PTR_PTR. Ignore the | |
1284 | first entry if IGNORE_FIRST and set global MAIN_LM_ADDR according | |
1285 | to it. Returns nonzero upon success. If zero is returned the | |
1286 | entries stored to LINK_PTR_PTR are still valid although they may | |
1287 | represent only part of the inferior library list. */ | |
13437d4b | 1288 | |
f9e14852 GB |
1289 | static int |
1290 | svr4_read_so_list (CORE_ADDR lm, CORE_ADDR prev_lm, | |
1291 | struct so_list ***link_ptr_ptr, int ignore_first) | |
13437d4b | 1292 | { |
c725e7b6 | 1293 | CORE_ADDR first_l_name = 0; |
f9e14852 | 1294 | CORE_ADDR next_lm; |
13437d4b | 1295 | |
cb08cc53 | 1296 | for (; lm != 0; prev_lm = lm, lm = next_lm) |
13437d4b | 1297 | { |
cb08cc53 | 1298 | int errcode; |
e83e4e24 | 1299 | gdb::unique_xmalloc_ptr<char> buffer; |
13437d4b | 1300 | |
b3bc8453 | 1301 | so_list_up newobj (XCNEW (struct so_list)); |
13437d4b | 1302 | |
a7961323 | 1303 | lm_info_svr4 *li = lm_info_read (lm).release (); |
d0e449a1 SM |
1304 | newobj->lm_info = li; |
1305 | if (li == NULL) | |
b3bc8453 | 1306 | return 0; |
13437d4b | 1307 | |
d0e449a1 | 1308 | next_lm = li->l_next; |
492928e4 | 1309 | |
d0e449a1 | 1310 | if (li->l_prev != prev_lm) |
492928e4 | 1311 | { |
2268b414 | 1312 | warning (_("Corrupted shared library list: %s != %s"), |
f5656ead | 1313 | paddress (target_gdbarch (), prev_lm), |
d0e449a1 | 1314 | paddress (target_gdbarch (), li->l_prev)); |
f9e14852 | 1315 | return 0; |
492928e4 | 1316 | } |
13437d4b KB |
1317 | |
1318 | /* For SVR4 versions, the first entry in the link map is for the | |
1319 | inferior executable, so we must ignore it. For some versions of | |
1320 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1321 | does have a name, so we can no longer use a missing name to | |
c378eb4e | 1322 | decide when to ignore it. */ |
d0e449a1 | 1323 | if (ignore_first && li->l_prev == 0) |
93a57060 | 1324 | { |
cb08cc53 JK |
1325 | struct svr4_info *info = get_svr4_info (); |
1326 | ||
d0e449a1 SM |
1327 | first_l_name = li->l_name; |
1328 | info->main_lm_addr = li->lm_addr; | |
cb08cc53 | 1329 | continue; |
93a57060 | 1330 | } |
13437d4b | 1331 | |
cb08cc53 | 1332 | /* Extract this shared object's name. */ |
d0e449a1 SM |
1333 | target_read_string (li->l_name, &buffer, SO_NAME_MAX_PATH_SIZE - 1, |
1334 | &errcode); | |
cb08cc53 JK |
1335 | if (errcode != 0) |
1336 | { | |
7d760051 UW |
1337 | /* If this entry's l_name address matches that of the |
1338 | inferior executable, then this is not a normal shared | |
1339 | object, but (most likely) a vDSO. In this case, silently | |
1340 | skip it; otherwise emit a warning. */ | |
d0e449a1 | 1341 | if (first_l_name == 0 || li->l_name != first_l_name) |
7d760051 UW |
1342 | warning (_("Can't read pathname for load map: %s."), |
1343 | safe_strerror (errcode)); | |
cb08cc53 | 1344 | continue; |
13437d4b KB |
1345 | } |
1346 | ||
e83e4e24 | 1347 | strncpy (newobj->so_name, buffer.get (), SO_NAME_MAX_PATH_SIZE - 1); |
fe978cb0 PA |
1348 | newobj->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
1349 | strcpy (newobj->so_original_name, newobj->so_name); | |
492928e4 | 1350 | |
cb08cc53 JK |
1351 | /* If this entry has no name, or its name matches the name |
1352 | for the main executable, don't include it in the list. */ | |
fe978cb0 | 1353 | if (! newobj->so_name[0] || match_main (newobj->so_name)) |
b3bc8453 | 1354 | continue; |
e4cd0d6a | 1355 | |
fe978cb0 | 1356 | newobj->next = 0; |
b3bc8453 TT |
1357 | /* Don't free it now. */ |
1358 | **link_ptr_ptr = newobj.release (); | |
1359 | *link_ptr_ptr = &(**link_ptr_ptr)->next; | |
13437d4b | 1360 | } |
f9e14852 GB |
1361 | |
1362 | return 1; | |
cb08cc53 JK |
1363 | } |
1364 | ||
f9e14852 GB |
1365 | /* Read the full list of currently loaded shared objects directly |
1366 | from the inferior, without referring to any libraries read and | |
1367 | stored by the probes interface. Handle special cases relating | |
1368 | to the first elements of the list. */ | |
cb08cc53 JK |
1369 | |
1370 | static struct so_list * | |
f9e14852 | 1371 | svr4_current_sos_direct (struct svr4_info *info) |
cb08cc53 JK |
1372 | { |
1373 | CORE_ADDR lm; | |
1374 | struct so_list *head = NULL; | |
1375 | struct so_list **link_ptr = &head; | |
cb08cc53 | 1376 | int ignore_first; |
2268b414 JK |
1377 | struct svr4_library_list library_list; |
1378 | ||
0c5bf5a9 JK |
1379 | /* Fall back to manual examination of the target if the packet is not |
1380 | supported or gdbserver failed to find DT_DEBUG. gdb.server/solib-list.exp | |
1381 | tests a case where gdbserver cannot find the shared libraries list while | |
1382 | GDB itself is able to find it via SYMFILE_OBJFILE. | |
1383 | ||
1384 | Unfortunately statically linked inferiors will also fall back through this | |
1385 | suboptimal code path. */ | |
1386 | ||
f9e14852 GB |
1387 | info->using_xfer = svr4_current_sos_via_xfer_libraries (&library_list, |
1388 | NULL); | |
1389 | if (info->using_xfer) | |
2268b414 JK |
1390 | { |
1391 | if (library_list.main_lm) | |
f9e14852 | 1392 | info->main_lm_addr = library_list.main_lm; |
2268b414 JK |
1393 | |
1394 | return library_list.head ? library_list.head : svr4_default_sos (); | |
1395 | } | |
cb08cc53 | 1396 | |
cb08cc53 JK |
1397 | /* Always locate the debug struct, in case it has moved. */ |
1398 | info->debug_base = 0; | |
1399 | locate_base (info); | |
1400 | ||
1401 | /* If we can't find the dynamic linker's base structure, this | |
1402 | must not be a dynamically linked executable. Hmm. */ | |
1403 | if (! info->debug_base) | |
1404 | return svr4_default_sos (); | |
1405 | ||
1406 | /* Assume that everything is a library if the dynamic loader was loaded | |
1407 | late by a static executable. */ | |
1408 | if (exec_bfd && bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL) | |
1409 | ignore_first = 0; | |
1410 | else | |
1411 | ignore_first = 1; | |
1412 | ||
2b6ff1c0 TT |
1413 | auto cleanup = make_scope_exit ([&] () |
1414 | { | |
1415 | svr4_free_library_list (&head); | |
1416 | }); | |
cb08cc53 JK |
1417 | |
1418 | /* Walk the inferior's link map list, and build our list of | |
1419 | `struct so_list' nodes. */ | |
1420 | lm = solib_svr4_r_map (info); | |
1421 | if (lm) | |
f9e14852 | 1422 | svr4_read_so_list (lm, 0, &link_ptr, ignore_first); |
cb08cc53 JK |
1423 | |
1424 | /* On Solaris, the dynamic linker is not in the normal list of | |
1425 | shared objects, so make sure we pick it up too. Having | |
1426 | symbol information for the dynamic linker is quite crucial | |
1427 | for skipping dynamic linker resolver code. */ | |
1428 | lm = solib_svr4_r_ldsomap (info); | |
1429 | if (lm) | |
f9e14852 | 1430 | svr4_read_so_list (lm, 0, &link_ptr, 0); |
cb08cc53 | 1431 | |
2b6ff1c0 | 1432 | cleanup.release (); |
13437d4b | 1433 | |
34439770 DJ |
1434 | if (head == NULL) |
1435 | return svr4_default_sos (); | |
1436 | ||
13437d4b KB |
1437 | return head; |
1438 | } | |
1439 | ||
8b9a549d PA |
1440 | /* Implement the main part of the "current_sos" target_so_ops |
1441 | method. */ | |
f9e14852 GB |
1442 | |
1443 | static struct so_list * | |
8b9a549d | 1444 | svr4_current_sos_1 (void) |
f9e14852 GB |
1445 | { |
1446 | struct svr4_info *info = get_svr4_info (); | |
1447 | ||
1448 | /* If the solib list has been read and stored by the probes | |
1449 | interface then we return a copy of the stored list. */ | |
1450 | if (info->solib_list != NULL) | |
1451 | return svr4_copy_library_list (info->solib_list); | |
1452 | ||
1453 | /* Otherwise obtain the solib list directly from the inferior. */ | |
1454 | return svr4_current_sos_direct (info); | |
1455 | } | |
1456 | ||
8b9a549d PA |
1457 | /* Implement the "current_sos" target_so_ops method. */ |
1458 | ||
1459 | static struct so_list * | |
1460 | svr4_current_sos (void) | |
1461 | { | |
1462 | struct so_list *so_head = svr4_current_sos_1 (); | |
1463 | struct mem_range vsyscall_range; | |
1464 | ||
1465 | /* Filter out the vDSO module, if present. Its symbol file would | |
1466 | not be found on disk. The vDSO/vsyscall's OBJFILE is instead | |
1467 | managed by symfile-mem.c:add_vsyscall_page. */ | |
1468 | if (gdbarch_vsyscall_range (target_gdbarch (), &vsyscall_range) | |
1469 | && vsyscall_range.length != 0) | |
1470 | { | |
1471 | struct so_list **sop; | |
1472 | ||
1473 | sop = &so_head; | |
1474 | while (*sop != NULL) | |
1475 | { | |
1476 | struct so_list *so = *sop; | |
1477 | ||
1478 | /* We can't simply match the vDSO by starting address alone, | |
1479 | because lm_info->l_addr_inferior (and also l_addr) do not | |
1480 | necessarily represent the real starting address of the | |
1481 | ELF if the vDSO's ELF itself is "prelinked". The l_ld | |
1482 | field (the ".dynamic" section of the shared object) | |
1483 | always points at the absolute/resolved address though. | |
1484 | So check whether that address is inside the vDSO's | |
1485 | mapping instead. | |
1486 | ||
1487 | E.g., on Linux 3.16 (x86_64) the vDSO is a regular | |
1488 | 0-based ELF, and we see: | |
1489 | ||
1490 | (gdb) info auxv | |
1491 | 33 AT_SYSINFO_EHDR System-supplied DSO's ELF header 0x7ffff7ffb000 | |
1492 | (gdb) p/x *_r_debug.r_map.l_next | |
1493 | $1 = {l_addr = 0x7ffff7ffb000, ..., l_ld = 0x7ffff7ffb318, ...} | |
1494 | ||
1495 | And on Linux 2.6.32 (x86_64) we see: | |
1496 | ||
1497 | (gdb) info auxv | |
1498 | 33 AT_SYSINFO_EHDR System-supplied DSO's ELF header 0x7ffff7ffe000 | |
1499 | (gdb) p/x *_r_debug.r_map.l_next | |
1500 | $5 = {l_addr = 0x7ffff88fe000, ..., l_ld = 0x7ffff7ffe580, ... } | |
1501 | ||
1502 | Dumping that vDSO shows: | |
1503 | ||
1504 | (gdb) info proc mappings | |
1505 | 0x7ffff7ffe000 0x7ffff7fff000 0x1000 0 [vdso] | |
1506 | (gdb) dump memory vdso.bin 0x7ffff7ffe000 0x7ffff7fff000 | |
1507 | # readelf -Wa vdso.bin | |
1508 | [...] | |
1509 | Entry point address: 0xffffffffff700700 | |
1510 | [...] | |
1511 | Section Headers: | |
1512 | [Nr] Name Type Address Off Size | |
1513 | [ 0] NULL 0000000000000000 000000 000000 | |
1514 | [ 1] .hash HASH ffffffffff700120 000120 000038 | |
1515 | [ 2] .dynsym DYNSYM ffffffffff700158 000158 0000d8 | |
1516 | [...] | |
1517 | [ 9] .dynamic DYNAMIC ffffffffff700580 000580 0000f0 | |
1518 | */ | |
d0e449a1 SM |
1519 | |
1520 | lm_info_svr4 *li = (lm_info_svr4 *) so->lm_info; | |
1521 | ||
1522 | if (address_in_mem_range (li->l_ld, &vsyscall_range)) | |
8b9a549d PA |
1523 | { |
1524 | *sop = so->next; | |
1525 | free_so (so); | |
1526 | break; | |
1527 | } | |
1528 | ||
1529 | sop = &so->next; | |
1530 | } | |
1531 | } | |
1532 | ||
1533 | return so_head; | |
1534 | } | |
1535 | ||
93a57060 | 1536 | /* Get the address of the link_map for a given OBJFILE. */ |
bc4a16ae EZ |
1537 | |
1538 | CORE_ADDR | |
1539 | svr4_fetch_objfile_link_map (struct objfile *objfile) | |
1540 | { | |
93a57060 | 1541 | struct so_list *so; |
6c95b8df | 1542 | struct svr4_info *info = get_svr4_info (); |
bc4a16ae | 1543 | |
93a57060 | 1544 | /* Cause svr4_current_sos() to be run if it hasn't been already. */ |
1a816a87 | 1545 | if (info->main_lm_addr == 0) |
e696b3ad | 1546 | solib_add (NULL, 0, auto_solib_add); |
bc4a16ae | 1547 | |
93a57060 DJ |
1548 | /* svr4_current_sos() will set main_lm_addr for the main executable. */ |
1549 | if (objfile == symfile_objfile) | |
1a816a87 | 1550 | return info->main_lm_addr; |
93a57060 | 1551 | |
df22c1e5 JB |
1552 | /* If OBJFILE is a separate debug object file, look for the |
1553 | original object file. */ | |
1554 | if (objfile->separate_debug_objfile_backlink != NULL) | |
1555 | objfile = objfile->separate_debug_objfile_backlink; | |
1556 | ||
93a57060 DJ |
1557 | /* The other link map addresses may be found by examining the list |
1558 | of shared libraries. */ | |
1559 | for (so = master_so_list (); so; so = so->next) | |
1560 | if (so->objfile == objfile) | |
d0e449a1 SM |
1561 | { |
1562 | lm_info_svr4 *li = (lm_info_svr4 *) so->lm_info; | |
1563 | ||
1564 | return li->lm_addr; | |
1565 | } | |
93a57060 DJ |
1566 | |
1567 | /* Not found! */ | |
bc4a16ae EZ |
1568 | return 0; |
1569 | } | |
13437d4b KB |
1570 | |
1571 | /* On some systems, the only way to recognize the link map entry for | |
1572 | the main executable file is by looking at its name. Return | |
1573 | non-zero iff SONAME matches one of the known main executable names. */ | |
1574 | ||
1575 | static int | |
bc043ef3 | 1576 | match_main (const char *soname) |
13437d4b | 1577 | { |
bc043ef3 | 1578 | const char * const *mainp; |
13437d4b KB |
1579 | |
1580 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
1581 | { | |
1582 | if (strcmp (soname, *mainp) == 0) | |
1583 | return (1); | |
1584 | } | |
1585 | ||
1586 | return (0); | |
1587 | } | |
1588 | ||
13437d4b KB |
1589 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
1590 | SVR4 run time loader. */ | |
13437d4b | 1591 | |
7d522c90 | 1592 | int |
d7fa2ae2 | 1593 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) |
13437d4b | 1594 | { |
6c95b8df PA |
1595 | struct svr4_info *info = get_svr4_info (); |
1596 | ||
1597 | return ((pc >= info->interp_text_sect_low | |
1598 | && pc < info->interp_text_sect_high) | |
1599 | || (pc >= info->interp_plt_sect_low | |
1600 | && pc < info->interp_plt_sect_high) | |
3e5d3a5a | 1601 | || in_plt_section (pc) |
0875794a | 1602 | || in_gnu_ifunc_stub (pc)); |
13437d4b | 1603 | } |
13437d4b | 1604 | |
2f4950cd AC |
1605 | /* Given an executable's ABFD and target, compute the entry-point |
1606 | address. */ | |
1607 | ||
1608 | static CORE_ADDR | |
1609 | exec_entry_point (struct bfd *abfd, struct target_ops *targ) | |
1610 | { | |
8c2b9656 YQ |
1611 | CORE_ADDR addr; |
1612 | ||
2f4950cd AC |
1613 | /* KevinB wrote ... for most targets, the address returned by |
1614 | bfd_get_start_address() is the entry point for the start | |
1615 | function. But, for some targets, bfd_get_start_address() returns | |
1616 | the address of a function descriptor from which the entry point | |
1617 | address may be extracted. This address is extracted by | |
1618 | gdbarch_convert_from_func_ptr_addr(). The method | |
1619 | gdbarch_convert_from_func_ptr_addr() is the merely the identify | |
1620 | function for targets which don't use function descriptors. */ | |
8c2b9656 | 1621 | addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
2f4950cd AC |
1622 | bfd_get_start_address (abfd), |
1623 | targ); | |
8c2b9656 | 1624 | return gdbarch_addr_bits_remove (target_gdbarch (), addr); |
2f4950cd | 1625 | } |
13437d4b | 1626 | |
f9e14852 GB |
1627 | /* A probe and its associated action. */ |
1628 | ||
1629 | struct probe_and_action | |
1630 | { | |
1631 | /* The probe. */ | |
935676c9 | 1632 | probe *prob; |
f9e14852 | 1633 | |
729662a5 TT |
1634 | /* The relocated address of the probe. */ |
1635 | CORE_ADDR address; | |
1636 | ||
f9e14852 GB |
1637 | /* The action. */ |
1638 | enum probe_action action; | |
1639 | }; | |
1640 | ||
1641 | /* Returns a hash code for the probe_and_action referenced by p. */ | |
1642 | ||
1643 | static hashval_t | |
1644 | hash_probe_and_action (const void *p) | |
1645 | { | |
19ba03f4 | 1646 | const struct probe_and_action *pa = (const struct probe_and_action *) p; |
f9e14852 | 1647 | |
729662a5 | 1648 | return (hashval_t) pa->address; |
f9e14852 GB |
1649 | } |
1650 | ||
1651 | /* Returns non-zero if the probe_and_actions referenced by p1 and p2 | |
1652 | are equal. */ | |
1653 | ||
1654 | static int | |
1655 | equal_probe_and_action (const void *p1, const void *p2) | |
1656 | { | |
19ba03f4 SM |
1657 | const struct probe_and_action *pa1 = (const struct probe_and_action *) p1; |
1658 | const struct probe_and_action *pa2 = (const struct probe_and_action *) p2; | |
f9e14852 | 1659 | |
729662a5 | 1660 | return pa1->address == pa2->address; |
f9e14852 GB |
1661 | } |
1662 | ||
1663 | /* Register a solib event probe and its associated action in the | |
1664 | probes table. */ | |
1665 | ||
1666 | static void | |
935676c9 | 1667 | register_solib_event_probe (probe *prob, CORE_ADDR address, |
729662a5 | 1668 | enum probe_action action) |
f9e14852 GB |
1669 | { |
1670 | struct svr4_info *info = get_svr4_info (); | |
1671 | struct probe_and_action lookup, *pa; | |
1672 | void **slot; | |
1673 | ||
1674 | /* Create the probes table, if necessary. */ | |
1675 | if (info->probes_table == NULL) | |
1676 | info->probes_table = htab_create_alloc (1, hash_probe_and_action, | |
1677 | equal_probe_and_action, | |
1678 | xfree, xcalloc, xfree); | |
1679 | ||
935676c9 | 1680 | lookup.prob = prob; |
729662a5 | 1681 | lookup.address = address; |
f9e14852 GB |
1682 | slot = htab_find_slot (info->probes_table, &lookup, INSERT); |
1683 | gdb_assert (*slot == HTAB_EMPTY_ENTRY); | |
1684 | ||
1685 | pa = XCNEW (struct probe_and_action); | |
935676c9 | 1686 | pa->prob = prob; |
729662a5 | 1687 | pa->address = address; |
f9e14852 GB |
1688 | pa->action = action; |
1689 | ||
1690 | *slot = pa; | |
1691 | } | |
1692 | ||
1693 | /* Get the solib event probe at the specified location, and the | |
1694 | action associated with it. Returns NULL if no solib event probe | |
1695 | was found. */ | |
1696 | ||
1697 | static struct probe_and_action * | |
1698 | solib_event_probe_at (struct svr4_info *info, CORE_ADDR address) | |
1699 | { | |
f9e14852 GB |
1700 | struct probe_and_action lookup; |
1701 | void **slot; | |
1702 | ||
729662a5 | 1703 | lookup.address = address; |
f9e14852 GB |
1704 | slot = htab_find_slot (info->probes_table, &lookup, NO_INSERT); |
1705 | ||
1706 | if (slot == NULL) | |
1707 | return NULL; | |
1708 | ||
1709 | return (struct probe_and_action *) *slot; | |
1710 | } | |
1711 | ||
1712 | /* Decide what action to take when the specified solib event probe is | |
1713 | hit. */ | |
1714 | ||
1715 | static enum probe_action | |
1716 | solib_event_probe_action (struct probe_and_action *pa) | |
1717 | { | |
1718 | enum probe_action action; | |
73c6b475 | 1719 | unsigned probe_argc = 0; |
08a6411c | 1720 | struct frame_info *frame = get_current_frame (); |
f9e14852 GB |
1721 | |
1722 | action = pa->action; | |
1723 | if (action == DO_NOTHING || action == PROBES_INTERFACE_FAILED) | |
1724 | return action; | |
1725 | ||
1726 | gdb_assert (action == FULL_RELOAD || action == UPDATE_OR_RELOAD); | |
1727 | ||
1728 | /* Check that an appropriate number of arguments has been supplied. | |
1729 | We expect: | |
1730 | arg0: Lmid_t lmid (mandatory) | |
1731 | arg1: struct r_debug *debug_base (mandatory) | |
1732 | arg2: struct link_map *new (optional, for incremental updates) */ | |
a70b8144 | 1733 | try |
3bd7e5b7 | 1734 | { |
935676c9 | 1735 | probe_argc = pa->prob->get_argument_count (frame); |
3bd7e5b7 | 1736 | } |
230d2906 | 1737 | catch (const gdb_exception_error &ex) |
3bd7e5b7 SDJ |
1738 | { |
1739 | exception_print (gdb_stderr, ex); | |
1740 | probe_argc = 0; | |
1741 | } | |
3bd7e5b7 | 1742 | |
935676c9 SDJ |
1743 | /* If get_argument_count throws an exception, probe_argc will be set |
1744 | to zero. However, if pa->prob does not have arguments, then | |
1745 | get_argument_count will succeed but probe_argc will also be zero. | |
1746 | Both cases happen because of different things, but they are | |
1747 | treated equally here: action will be set to | |
3bd7e5b7 | 1748 | PROBES_INTERFACE_FAILED. */ |
f9e14852 GB |
1749 | if (probe_argc == 2) |
1750 | action = FULL_RELOAD; | |
1751 | else if (probe_argc < 2) | |
1752 | action = PROBES_INTERFACE_FAILED; | |
1753 | ||
1754 | return action; | |
1755 | } | |
1756 | ||
1757 | /* Populate the shared object list by reading the entire list of | |
1758 | shared objects from the inferior. Handle special cases relating | |
1759 | to the first elements of the list. Returns nonzero on success. */ | |
1760 | ||
1761 | static int | |
1762 | solist_update_full (struct svr4_info *info) | |
1763 | { | |
1764 | free_solib_list (info); | |
1765 | info->solib_list = svr4_current_sos_direct (info); | |
1766 | ||
1767 | return 1; | |
1768 | } | |
1769 | ||
1770 | /* Update the shared object list starting from the link-map entry | |
1771 | passed by the linker in the probe's third argument. Returns | |
1772 | nonzero if the list was successfully updated, or zero to indicate | |
1773 | failure. */ | |
1774 | ||
1775 | static int | |
1776 | solist_update_incremental (struct svr4_info *info, CORE_ADDR lm) | |
1777 | { | |
1778 | struct so_list *tail; | |
1779 | CORE_ADDR prev_lm; | |
1780 | ||
1781 | /* svr4_current_sos_direct contains logic to handle a number of | |
1782 | special cases relating to the first elements of the list. To | |
1783 | avoid duplicating this logic we defer to solist_update_full | |
1784 | if the list is empty. */ | |
1785 | if (info->solib_list == NULL) | |
1786 | return 0; | |
1787 | ||
1788 | /* Fall back to a full update if we are using a remote target | |
1789 | that does not support incremental transfers. */ | |
1790 | if (info->using_xfer && !target_augmented_libraries_svr4_read ()) | |
1791 | return 0; | |
1792 | ||
1793 | /* Walk to the end of the list. */ | |
1794 | for (tail = info->solib_list; tail->next != NULL; tail = tail->next) | |
1795 | /* Nothing. */; | |
d0e449a1 SM |
1796 | |
1797 | lm_info_svr4 *li = (lm_info_svr4 *) tail->lm_info; | |
1798 | prev_lm = li->lm_addr; | |
f9e14852 GB |
1799 | |
1800 | /* Read the new objects. */ | |
1801 | if (info->using_xfer) | |
1802 | { | |
1803 | struct svr4_library_list library_list; | |
1804 | char annex[64]; | |
1805 | ||
1806 | xsnprintf (annex, sizeof (annex), "start=%s;prev=%s", | |
1807 | phex_nz (lm, sizeof (lm)), | |
1808 | phex_nz (prev_lm, sizeof (prev_lm))); | |
1809 | if (!svr4_current_sos_via_xfer_libraries (&library_list, annex)) | |
1810 | return 0; | |
1811 | ||
1812 | tail->next = library_list.head; | |
1813 | } | |
1814 | else | |
1815 | { | |
1816 | struct so_list **link = &tail->next; | |
1817 | ||
1818 | /* IGNORE_FIRST may safely be set to zero here because the | |
1819 | above check and deferral to solist_update_full ensures | |
1820 | that this call to svr4_read_so_list will never see the | |
1821 | first element. */ | |
1822 | if (!svr4_read_so_list (lm, prev_lm, &link, 0)) | |
1823 | return 0; | |
1824 | } | |
1825 | ||
1826 | return 1; | |
1827 | } | |
1828 | ||
1829 | /* Disable the probes-based linker interface and revert to the | |
1830 | original interface. We don't reset the breakpoints as the | |
1831 | ones set up for the probes-based interface are adequate. */ | |
1832 | ||
1833 | static void | |
d01c5877 | 1834 | disable_probes_interface () |
f9e14852 GB |
1835 | { |
1836 | struct svr4_info *info = get_svr4_info (); | |
1837 | ||
1838 | warning (_("Probes-based dynamic linker interface failed.\n" | |
1839 | "Reverting to original interface.\n")); | |
1840 | ||
1841 | free_probes_table (info); | |
1842 | free_solib_list (info); | |
1843 | } | |
1844 | ||
1845 | /* Update the solib list as appropriate when using the | |
1846 | probes-based linker interface. Do nothing if using the | |
1847 | standard interface. */ | |
1848 | ||
1849 | static void | |
1850 | svr4_handle_solib_event (void) | |
1851 | { | |
1852 | struct svr4_info *info = get_svr4_info (); | |
1853 | struct probe_and_action *pa; | |
1854 | enum probe_action action; | |
ad1c917a | 1855 | struct value *val = NULL; |
f9e14852 | 1856 | CORE_ADDR pc, debug_base, lm = 0; |
08a6411c | 1857 | struct frame_info *frame = get_current_frame (); |
f9e14852 GB |
1858 | |
1859 | /* Do nothing if not using the probes interface. */ | |
1860 | if (info->probes_table == NULL) | |
1861 | return; | |
1862 | ||
1863 | /* If anything goes wrong we revert to the original linker | |
1864 | interface. */ | |
d01c5877 | 1865 | auto cleanup = make_scope_exit (disable_probes_interface); |
f9e14852 GB |
1866 | |
1867 | pc = regcache_read_pc (get_current_regcache ()); | |
1868 | pa = solib_event_probe_at (info, pc); | |
1869 | if (pa == NULL) | |
d01c5877 | 1870 | return; |
f9e14852 GB |
1871 | |
1872 | action = solib_event_probe_action (pa); | |
1873 | if (action == PROBES_INTERFACE_FAILED) | |
d01c5877 | 1874 | return; |
f9e14852 GB |
1875 | |
1876 | if (action == DO_NOTHING) | |
1877 | { | |
d01c5877 | 1878 | cleanup.release (); |
f9e14852 GB |
1879 | return; |
1880 | } | |
1881 | ||
935676c9 | 1882 | /* evaluate_argument looks up symbols in the dynamic linker |
f9e14852 GB |
1883 | using find_pc_section. find_pc_section is accelerated by a cache |
1884 | called the section map. The section map is invalidated every | |
1885 | time a shared library is loaded or unloaded, and if the inferior | |
1886 | is generating a lot of shared library events then the section map | |
1887 | will be updated every time svr4_handle_solib_event is called. | |
1888 | We called find_pc_section in svr4_create_solib_event_breakpoints, | |
1889 | so we can guarantee that the dynamic linker's sections are in the | |
1890 | section map. We can therefore inhibit section map updates across | |
935676c9 | 1891 | these calls to evaluate_argument and save a lot of time. */ |
06424eac TT |
1892 | { |
1893 | scoped_restore inhibit_updates | |
1894 | = inhibit_section_map_updates (current_program_space); | |
f9e14852 | 1895 | |
a70b8144 | 1896 | try |
06424eac TT |
1897 | { |
1898 | val = pa->prob->evaluate_argument (1, frame); | |
1899 | } | |
230d2906 | 1900 | catch (const gdb_exception_error &ex) |
06424eac TT |
1901 | { |
1902 | exception_print (gdb_stderr, ex); | |
1903 | val = NULL; | |
1904 | } | |
f9e14852 | 1905 | |
06424eac | 1906 | if (val == NULL) |
d01c5877 | 1907 | return; |
f9e14852 | 1908 | |
06424eac TT |
1909 | debug_base = value_as_address (val); |
1910 | if (debug_base == 0) | |
d01c5877 | 1911 | return; |
f9e14852 | 1912 | |
06424eac TT |
1913 | /* Always locate the debug struct, in case it moved. */ |
1914 | info->debug_base = 0; | |
1915 | if (locate_base (info) == 0) | |
d01c5877 | 1916 | return; |
3bd7e5b7 | 1917 | |
06424eac TT |
1918 | /* GDB does not currently support libraries loaded via dlmopen |
1919 | into namespaces other than the initial one. We must ignore | |
1920 | any namespace other than the initial namespace here until | |
1921 | support for this is added to GDB. */ | |
1922 | if (debug_base != info->debug_base) | |
1923 | action = DO_NOTHING; | |
f9e14852 | 1924 | |
06424eac TT |
1925 | if (action == UPDATE_OR_RELOAD) |
1926 | { | |
a70b8144 | 1927 | try |
06424eac TT |
1928 | { |
1929 | val = pa->prob->evaluate_argument (2, frame); | |
1930 | } | |
230d2906 | 1931 | catch (const gdb_exception_error &ex) |
06424eac TT |
1932 | { |
1933 | exception_print (gdb_stderr, ex); | |
06424eac TT |
1934 | return; |
1935 | } | |
06424eac TT |
1936 | |
1937 | if (val != NULL) | |
1938 | lm = value_as_address (val); | |
1939 | ||
1940 | if (lm == 0) | |
1941 | action = FULL_RELOAD; | |
1942 | } | |
f9e14852 | 1943 | |
06424eac TT |
1944 | /* Resume section map updates. Closing the scope is |
1945 | sufficient. */ | |
1946 | } | |
f9e14852 GB |
1947 | |
1948 | if (action == UPDATE_OR_RELOAD) | |
1949 | { | |
1950 | if (!solist_update_incremental (info, lm)) | |
1951 | action = FULL_RELOAD; | |
1952 | } | |
1953 | ||
1954 | if (action == FULL_RELOAD) | |
1955 | { | |
1956 | if (!solist_update_full (info)) | |
d01c5877 | 1957 | return; |
f9e14852 GB |
1958 | } |
1959 | ||
d01c5877 | 1960 | cleanup.release (); |
f9e14852 GB |
1961 | } |
1962 | ||
1963 | /* Helper function for svr4_update_solib_event_breakpoints. */ | |
1964 | ||
1965 | static int | |
1966 | svr4_update_solib_event_breakpoint (struct breakpoint *b, void *arg) | |
1967 | { | |
1968 | struct bp_location *loc; | |
1969 | ||
1970 | if (b->type != bp_shlib_event) | |
1971 | { | |
1972 | /* Continue iterating. */ | |
1973 | return 0; | |
1974 | } | |
1975 | ||
1976 | for (loc = b->loc; loc != NULL; loc = loc->next) | |
1977 | { | |
1978 | struct svr4_info *info; | |
1979 | struct probe_and_action *pa; | |
1980 | ||
19ba03f4 SM |
1981 | info = ((struct svr4_info *) |
1982 | program_space_data (loc->pspace, solib_svr4_pspace_data)); | |
f9e14852 GB |
1983 | if (info == NULL || info->probes_table == NULL) |
1984 | continue; | |
1985 | ||
1986 | pa = solib_event_probe_at (info, loc->address); | |
1987 | if (pa == NULL) | |
1988 | continue; | |
1989 | ||
1990 | if (pa->action == DO_NOTHING) | |
1991 | { | |
1992 | if (b->enable_state == bp_disabled && stop_on_solib_events) | |
1993 | enable_breakpoint (b); | |
1994 | else if (b->enable_state == bp_enabled && !stop_on_solib_events) | |
1995 | disable_breakpoint (b); | |
1996 | } | |
1997 | ||
1998 | break; | |
1999 | } | |
2000 | ||
2001 | /* Continue iterating. */ | |
2002 | return 0; | |
2003 | } | |
2004 | ||
2005 | /* Enable or disable optional solib event breakpoints as appropriate. | |
2006 | Called whenever stop_on_solib_events is changed. */ | |
2007 | ||
2008 | static void | |
2009 | svr4_update_solib_event_breakpoints (void) | |
2010 | { | |
2011 | iterate_over_breakpoints (svr4_update_solib_event_breakpoint, NULL); | |
2012 | } | |
2013 | ||
2014 | /* Create and register solib event breakpoints. PROBES is an array | |
2015 | of NUM_PROBES elements, each of which is vector of probes. A | |
2016 | solib event breakpoint will be created and registered for each | |
2017 | probe. */ | |
2018 | ||
2019 | static void | |
2020 | svr4_create_probe_breakpoints (struct gdbarch *gdbarch, | |
45461e0d | 2021 | const std::vector<probe *> *probes, |
729662a5 | 2022 | struct objfile *objfile) |
f9e14852 | 2023 | { |
45461e0d | 2024 | for (int i = 0; i < NUM_PROBES; i++) |
f9e14852 GB |
2025 | { |
2026 | enum probe_action action = probe_info[i].action; | |
f9e14852 | 2027 | |
45461e0d | 2028 | for (probe *p : probes[i]) |
f9e14852 | 2029 | { |
935676c9 | 2030 | CORE_ADDR address = p->get_relocated_address (objfile); |
729662a5 TT |
2031 | |
2032 | create_solib_event_breakpoint (gdbarch, address); | |
45461e0d | 2033 | register_solib_event_probe (p, address, action); |
f9e14852 GB |
2034 | } |
2035 | } | |
2036 | ||
2037 | svr4_update_solib_event_breakpoints (); | |
2038 | } | |
2039 | ||
2040 | /* Both the SunOS and the SVR4 dynamic linkers call a marker function | |
2041 | before and after mapping and unmapping shared libraries. The sole | |
2042 | purpose of this method is to allow debuggers to set a breakpoint so | |
2043 | they can track these changes. | |
2044 | ||
2045 | Some versions of the glibc dynamic linker contain named probes | |
2046 | to allow more fine grained stopping. Given the address of the | |
2047 | original marker function, this function attempts to find these | |
2048 | probes, and if found, sets breakpoints on those instead. If the | |
2049 | probes aren't found, a single breakpoint is set on the original | |
2050 | marker function. */ | |
2051 | ||
2052 | static void | |
2053 | svr4_create_solib_event_breakpoints (struct gdbarch *gdbarch, | |
2054 | CORE_ADDR address) | |
2055 | { | |
2056 | struct obj_section *os; | |
2057 | ||
2058 | os = find_pc_section (address); | |
2059 | if (os != NULL) | |
2060 | { | |
2061 | int with_prefix; | |
2062 | ||
2063 | for (with_prefix = 0; with_prefix <= 1; with_prefix++) | |
2064 | { | |
45461e0d | 2065 | std::vector<probe *> probes[NUM_PROBES]; |
f9e14852 | 2066 | int all_probes_found = 1; |
25f9533e | 2067 | int checked_can_use_probe_arguments = 0; |
f9e14852 | 2068 | |
45461e0d | 2069 | for (int i = 0; i < NUM_PROBES; i++) |
f9e14852 GB |
2070 | { |
2071 | const char *name = probe_info[i].name; | |
935676c9 | 2072 | probe *p; |
f9e14852 GB |
2073 | char buf[32]; |
2074 | ||
2075 | /* Fedora 17 and Red Hat Enterprise Linux 6.2-6.4 | |
2076 | shipped with an early version of the probes code in | |
2077 | which the probes' names were prefixed with "rtld_" | |
2078 | and the "map_failed" probe did not exist. The | |
2079 | locations of the probes are otherwise the same, so | |
2080 | we check for probes with prefixed names if probes | |
2081 | with unprefixed names are not present. */ | |
2082 | if (with_prefix) | |
2083 | { | |
2084 | xsnprintf (buf, sizeof (buf), "rtld_%s", name); | |
2085 | name = buf; | |
2086 | } | |
2087 | ||
2088 | probes[i] = find_probes_in_objfile (os->objfile, "rtld", name); | |
2089 | ||
2090 | /* The "map_failed" probe did not exist in early | |
2091 | versions of the probes code in which the probes' | |
2092 | names were prefixed with "rtld_". */ | |
2093 | if (strcmp (name, "rtld_map_failed") == 0) | |
2094 | continue; | |
2095 | ||
45461e0d | 2096 | if (probes[i].empty ()) |
f9e14852 GB |
2097 | { |
2098 | all_probes_found = 0; | |
2099 | break; | |
2100 | } | |
25f9533e SDJ |
2101 | |
2102 | /* Ensure probe arguments can be evaluated. */ | |
2103 | if (!checked_can_use_probe_arguments) | |
2104 | { | |
45461e0d | 2105 | p = probes[i][0]; |
935676c9 | 2106 | if (!p->can_evaluate_arguments ()) |
25f9533e SDJ |
2107 | { |
2108 | all_probes_found = 0; | |
2109 | break; | |
2110 | } | |
2111 | checked_can_use_probe_arguments = 1; | |
2112 | } | |
f9e14852 GB |
2113 | } |
2114 | ||
2115 | if (all_probes_found) | |
729662a5 | 2116 | svr4_create_probe_breakpoints (gdbarch, probes, os->objfile); |
f9e14852 | 2117 | |
f9e14852 GB |
2118 | if (all_probes_found) |
2119 | return; | |
2120 | } | |
2121 | } | |
2122 | ||
2123 | create_solib_event_breakpoint (gdbarch, address); | |
2124 | } | |
2125 | ||
cb457ae2 YQ |
2126 | /* Helper function for gdb_bfd_lookup_symbol. */ |
2127 | ||
2128 | static int | |
3953f15c | 2129 | cmp_name_and_sec_flags (const asymbol *sym, const void *data) |
cb457ae2 YQ |
2130 | { |
2131 | return (strcmp (sym->name, (const char *) data) == 0 | |
2132 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0); | |
2133 | } | |
7f86f058 | 2134 | /* Arrange for dynamic linker to hit breakpoint. |
13437d4b KB |
2135 | |
2136 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
2137 | debugger interface, support for arranging for the inferior to hit | |
2138 | a breakpoint after mapping in the shared libraries. This function | |
2139 | enables that breakpoint. | |
2140 | ||
2141 | For SunOS, there is a special flag location (in_debugger) which we | |
2142 | set to 1. When the dynamic linker sees this flag set, it will set | |
2143 | a breakpoint at a location known only to itself, after saving the | |
2144 | original contents of that place and the breakpoint address itself, | |
2145 | in it's own internal structures. When we resume the inferior, it | |
2146 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
2147 | We handle this (in a different place) by restoring the contents of | |
2148 | the breakpointed location (which is only known after it stops), | |
2149 | chasing around to locate the shared libraries that have been | |
2150 | loaded, then resuming. | |
2151 | ||
2152 | For SVR4, the debugger interface structure contains a member (r_brk) | |
2153 | which is statically initialized at the time the shared library is | |
2154 | built, to the offset of a function (_r_debug_state) which is guaran- | |
2155 | teed to be called once before mapping in a library, and again when | |
2156 | the mapping is complete. At the time we are examining this member, | |
2157 | it contains only the unrelocated offset of the function, so we have | |
2158 | to do our own relocation. Later, when the dynamic linker actually | |
2159 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
2160 | ||
2161 | The debugger interface structure also contains an enumeration which | |
2162 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
2163 | depending upon whether or not the library is being mapped or unmapped, | |
7f86f058 | 2164 | and then set to RT_CONSISTENT after the library is mapped/unmapped. */ |
13437d4b KB |
2165 | |
2166 | static int | |
268a4a75 | 2167 | enable_break (struct svr4_info *info, int from_tty) |
13437d4b | 2168 | { |
3b7344d5 | 2169 | struct bound_minimal_symbol msymbol; |
bc043ef3 | 2170 | const char * const *bkpt_namep; |
13437d4b | 2171 | asection *interp_sect; |
7cd25cfc | 2172 | CORE_ADDR sym_addr; |
13437d4b | 2173 | |
6c95b8df PA |
2174 | info->interp_text_sect_low = info->interp_text_sect_high = 0; |
2175 | info->interp_plt_sect_low = info->interp_plt_sect_high = 0; | |
13437d4b | 2176 | |
7cd25cfc DJ |
2177 | /* If we already have a shared library list in the target, and |
2178 | r_debug contains r_brk, set the breakpoint there - this should | |
2179 | mean r_brk has already been relocated. Assume the dynamic linker | |
2180 | is the object containing r_brk. */ | |
2181 | ||
e696b3ad | 2182 | solib_add (NULL, from_tty, auto_solib_add); |
7cd25cfc | 2183 | sym_addr = 0; |
1a816a87 PA |
2184 | if (info->debug_base && solib_svr4_r_map (info) != 0) |
2185 | sym_addr = solib_svr4_r_brk (info); | |
7cd25cfc DJ |
2186 | |
2187 | if (sym_addr != 0) | |
2188 | { | |
2189 | struct obj_section *os; | |
2190 | ||
b36ec657 | 2191 | sym_addr = gdbarch_addr_bits_remove |
8b88a78e PA |
2192 | (target_gdbarch (), |
2193 | gdbarch_convert_from_func_ptr_addr (target_gdbarch (), | |
2194 | sym_addr, | |
2195 | current_top_target ())); | |
b36ec657 | 2196 | |
48379de6 DE |
2197 | /* On at least some versions of Solaris there's a dynamic relocation |
2198 | on _r_debug.r_brk and SYM_ADDR may not be relocated yet, e.g., if | |
2199 | we get control before the dynamic linker has self-relocated. | |
2200 | Check if SYM_ADDR is in a known section, if it is assume we can | |
2201 | trust its value. This is just a heuristic though, it could go away | |
2202 | or be replaced if it's getting in the way. | |
2203 | ||
2204 | On ARM we need to know whether the ISA of rtld_db_dlactivity (or | |
2205 | however it's spelled in your particular system) is ARM or Thumb. | |
2206 | That knowledge is encoded in the address, if it's Thumb the low bit | |
2207 | is 1. However, we've stripped that info above and it's not clear | |
2208 | what all the consequences are of passing a non-addr_bits_remove'd | |
f9e14852 | 2209 | address to svr4_create_solib_event_breakpoints. The call to |
48379de6 DE |
2210 | find_pc_section verifies we know about the address and have some |
2211 | hope of computing the right kind of breakpoint to use (via | |
2212 | symbol info). It does mean that GDB needs to be pointed at a | |
2213 | non-stripped version of the dynamic linker in order to obtain | |
2214 | information it already knows about. Sigh. */ | |
2215 | ||
7cd25cfc DJ |
2216 | os = find_pc_section (sym_addr); |
2217 | if (os != NULL) | |
2218 | { | |
2219 | /* Record the relocated start and end address of the dynamic linker | |
2220 | text and plt section for svr4_in_dynsym_resolve_code. */ | |
2221 | bfd *tmp_bfd; | |
2222 | CORE_ADDR load_addr; | |
2223 | ||
2224 | tmp_bfd = os->objfile->obfd; | |
2225 | load_addr = ANOFFSET (os->objfile->section_offsets, | |
e03e6279 | 2226 | SECT_OFF_TEXT (os->objfile)); |
7cd25cfc DJ |
2227 | |
2228 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
2229 | if (interp_sect) | |
2230 | { | |
6c95b8df | 2231 | info->interp_text_sect_low = |
7cd25cfc | 2232 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
2233 | info->interp_text_sect_high = |
2234 | info->interp_text_sect_low | |
2235 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
2236 | } |
2237 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
2238 | if (interp_sect) | |
2239 | { | |
6c95b8df | 2240 | info->interp_plt_sect_low = |
7cd25cfc | 2241 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
2242 | info->interp_plt_sect_high = |
2243 | info->interp_plt_sect_low | |
2244 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
2245 | } |
2246 | ||
f9e14852 | 2247 | svr4_create_solib_event_breakpoints (target_gdbarch (), sym_addr); |
7cd25cfc DJ |
2248 | return 1; |
2249 | } | |
2250 | } | |
2251 | ||
97ec2c2f | 2252 | /* Find the program interpreter; if not found, warn the user and drop |
13437d4b | 2253 | into the old breakpoint at symbol code. */ |
17658d46 SM |
2254 | gdb::optional<gdb::byte_vector> interp_name_holder |
2255 | = find_program_interpreter (); | |
2256 | if (interp_name_holder) | |
13437d4b | 2257 | { |
17658d46 | 2258 | const char *interp_name = (const char *) interp_name_holder->data (); |
8ad2fcde KB |
2259 | CORE_ADDR load_addr = 0; |
2260 | int load_addr_found = 0; | |
2ec9a4f8 | 2261 | int loader_found_in_list = 0; |
f8766ec1 | 2262 | struct so_list *so; |
2f4950cd | 2263 | struct target_ops *tmp_bfd_target; |
13437d4b | 2264 | |
7cd25cfc | 2265 | sym_addr = 0; |
13437d4b KB |
2266 | |
2267 | /* Now we need to figure out where the dynamic linker was | |
2268 | loaded so that we can load its symbols and place a breakpoint | |
2269 | in the dynamic linker itself. | |
2270 | ||
2271 | This address is stored on the stack. However, I've been unable | |
2272 | to find any magic formula to find it for Solaris (appears to | |
2273 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
2274 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 | 2275 | |
192b62ce | 2276 | gdb_bfd_ref_ptr tmp_bfd; |
a70b8144 | 2277 | try |
f1838a98 | 2278 | { |
97ec2c2f | 2279 | tmp_bfd = solib_bfd_open (interp_name); |
f1838a98 | 2280 | } |
230d2906 | 2281 | catch (const gdb_exception &ex) |
492d29ea PA |
2282 | { |
2283 | } | |
492d29ea | 2284 | |
13437d4b KB |
2285 | if (tmp_bfd == NULL) |
2286 | goto bkpt_at_symbol; | |
2287 | ||
2f4950cd | 2288 | /* Now convert the TMP_BFD into a target. That way target, as |
192b62ce TT |
2289 | well as BFD operations can be used. target_bfd_reopen |
2290 | acquires its own reference. */ | |
2291 | tmp_bfd_target = target_bfd_reopen (tmp_bfd.get ()); | |
2f4950cd | 2292 | |
f8766ec1 KB |
2293 | /* On a running target, we can get the dynamic linker's base |
2294 | address from the shared library table. */ | |
f8766ec1 KB |
2295 | so = master_so_list (); |
2296 | while (so) | |
8ad2fcde | 2297 | { |
97ec2c2f | 2298 | if (svr4_same_1 (interp_name, so->so_original_name)) |
8ad2fcde KB |
2299 | { |
2300 | load_addr_found = 1; | |
2ec9a4f8 | 2301 | loader_found_in_list = 1; |
192b62ce | 2302 | load_addr = lm_addr_check (so, tmp_bfd.get ()); |
8ad2fcde KB |
2303 | break; |
2304 | } | |
f8766ec1 | 2305 | so = so->next; |
8ad2fcde KB |
2306 | } |
2307 | ||
8d4e36ba JB |
2308 | /* If we were not able to find the base address of the loader |
2309 | from our so_list, then try using the AT_BASE auxilliary entry. */ | |
2310 | if (!load_addr_found) | |
8b88a78e | 2311 | if (target_auxv_search (current_top_target (), AT_BASE, &load_addr) > 0) |
ad3a0e5b | 2312 | { |
f5656ead | 2313 | int addr_bit = gdbarch_addr_bit (target_gdbarch ()); |
ad3a0e5b JK |
2314 | |
2315 | /* Ensure LOAD_ADDR has proper sign in its possible upper bits so | |
2316 | that `+ load_addr' will overflow CORE_ADDR width not creating | |
2317 | invalid addresses like 0x101234567 for 32bit inferiors on 64bit | |
2318 | GDB. */ | |
2319 | ||
d182d057 | 2320 | if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT)) |
ad3a0e5b | 2321 | { |
d182d057 | 2322 | CORE_ADDR space_size = (CORE_ADDR) 1 << addr_bit; |
192b62ce | 2323 | CORE_ADDR tmp_entry_point = exec_entry_point (tmp_bfd.get (), |
ad3a0e5b JK |
2324 | tmp_bfd_target); |
2325 | ||
2326 | gdb_assert (load_addr < space_size); | |
2327 | ||
2328 | /* TMP_ENTRY_POINT exceeding SPACE_SIZE would be for prelinked | |
2329 | 64bit ld.so with 32bit executable, it should not happen. */ | |
2330 | ||
2331 | if (tmp_entry_point < space_size | |
2332 | && tmp_entry_point + load_addr >= space_size) | |
2333 | load_addr -= space_size; | |
2334 | } | |
2335 | ||
2336 | load_addr_found = 1; | |
2337 | } | |
8d4e36ba | 2338 | |
8ad2fcde KB |
2339 | /* Otherwise we find the dynamic linker's base address by examining |
2340 | the current pc (which should point at the entry point for the | |
8d4e36ba JB |
2341 | dynamic linker) and subtracting the offset of the entry point. |
2342 | ||
2343 | This is more fragile than the previous approaches, but is a good | |
2344 | fallback method because it has actually been working well in | |
2345 | most cases. */ | |
8ad2fcde | 2346 | if (!load_addr_found) |
fb14de7b | 2347 | { |
c2250ad1 | 2348 | struct regcache *regcache |
f5656ead | 2349 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch ()); |
433759f7 | 2350 | |
fb14de7b | 2351 | load_addr = (regcache_read_pc (regcache) |
192b62ce | 2352 | - exec_entry_point (tmp_bfd.get (), tmp_bfd_target)); |
fb14de7b | 2353 | } |
2ec9a4f8 DJ |
2354 | |
2355 | if (!loader_found_in_list) | |
34439770 | 2356 | { |
1a816a87 PA |
2357 | info->debug_loader_name = xstrdup (interp_name); |
2358 | info->debug_loader_offset_p = 1; | |
2359 | info->debug_loader_offset = load_addr; | |
e696b3ad | 2360 | solib_add (NULL, from_tty, auto_solib_add); |
34439770 | 2361 | } |
13437d4b KB |
2362 | |
2363 | /* Record the relocated start and end address of the dynamic linker | |
d7fa2ae2 | 2364 | text and plt section for svr4_in_dynsym_resolve_code. */ |
192b62ce | 2365 | interp_sect = bfd_get_section_by_name (tmp_bfd.get (), ".text"); |
13437d4b KB |
2366 | if (interp_sect) |
2367 | { | |
6c95b8df | 2368 | info->interp_text_sect_low = |
192b62ce | 2369 | bfd_section_vma (tmp_bfd.get (), interp_sect) + load_addr; |
6c95b8df PA |
2370 | info->interp_text_sect_high = |
2371 | info->interp_text_sect_low | |
192b62ce | 2372 | + bfd_section_size (tmp_bfd.get (), interp_sect); |
13437d4b | 2373 | } |
192b62ce | 2374 | interp_sect = bfd_get_section_by_name (tmp_bfd.get (), ".plt"); |
13437d4b KB |
2375 | if (interp_sect) |
2376 | { | |
6c95b8df | 2377 | info->interp_plt_sect_low = |
192b62ce | 2378 | bfd_section_vma (tmp_bfd.get (), interp_sect) + load_addr; |
6c95b8df PA |
2379 | info->interp_plt_sect_high = |
2380 | info->interp_plt_sect_low | |
192b62ce | 2381 | + bfd_section_size (tmp_bfd.get (), interp_sect); |
13437d4b KB |
2382 | } |
2383 | ||
2384 | /* Now try to set a breakpoint in the dynamic linker. */ | |
2385 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
2386 | { | |
192b62ce TT |
2387 | sym_addr = gdb_bfd_lookup_symbol (tmp_bfd.get (), |
2388 | cmp_name_and_sec_flags, | |
3953f15c | 2389 | *bkpt_namep); |
13437d4b KB |
2390 | if (sym_addr != 0) |
2391 | break; | |
2392 | } | |
2393 | ||
2bbe3cc1 DJ |
2394 | if (sym_addr != 0) |
2395 | /* Convert 'sym_addr' from a function pointer to an address. | |
2396 | Because we pass tmp_bfd_target instead of the current | |
2397 | target, this will always produce an unrelocated value. */ | |
f5656ead | 2398 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
2bbe3cc1 DJ |
2399 | sym_addr, |
2400 | tmp_bfd_target); | |
2401 | ||
695c3173 TT |
2402 | /* We're done with both the temporary bfd and target. Closing |
2403 | the target closes the underlying bfd, because it holds the | |
2404 | only remaining reference. */ | |
460014f5 | 2405 | target_close (tmp_bfd_target); |
13437d4b KB |
2406 | |
2407 | if (sym_addr != 0) | |
2408 | { | |
f9e14852 GB |
2409 | svr4_create_solib_event_breakpoints (target_gdbarch (), |
2410 | load_addr + sym_addr); | |
13437d4b KB |
2411 | return 1; |
2412 | } | |
2413 | ||
2414 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
2415 | linker. Warn and drop into the old code. */ | |
2416 | bkpt_at_symbol: | |
82d03102 PG |
2417 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
2418 | "GDB will be unable to debug shared library initializers\n" | |
2419 | "and track explicitly loaded dynamic code.")); | |
13437d4b | 2420 | } |
13437d4b | 2421 | |
e499d0f1 DJ |
2422 | /* Scan through the lists of symbols, trying to look up the symbol and |
2423 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
2424 | ||
2425 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
2426 | { | |
2427 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
3b7344d5 | 2428 | if ((msymbol.minsym != NULL) |
77e371c0 | 2429 | && (BMSYMBOL_VALUE_ADDRESS (msymbol) != 0)) |
e499d0f1 | 2430 | { |
77e371c0 | 2431 | sym_addr = BMSYMBOL_VALUE_ADDRESS (msymbol); |
f5656ead | 2432 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
de64a9ac | 2433 | sym_addr, |
8b88a78e | 2434 | current_top_target ()); |
f9e14852 | 2435 | svr4_create_solib_event_breakpoints (target_gdbarch (), sym_addr); |
e499d0f1 DJ |
2436 | return 1; |
2437 | } | |
2438 | } | |
13437d4b | 2439 | |
17658d46 | 2440 | if (interp_name_holder && !current_inferior ()->attach_flag) |
13437d4b | 2441 | { |
c6490bf2 | 2442 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) |
13437d4b | 2443 | { |
c6490bf2 | 2444 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); |
3b7344d5 | 2445 | if ((msymbol.minsym != NULL) |
77e371c0 | 2446 | && (BMSYMBOL_VALUE_ADDRESS (msymbol) != 0)) |
c6490bf2 | 2447 | { |
77e371c0 | 2448 | sym_addr = BMSYMBOL_VALUE_ADDRESS (msymbol); |
f5656ead | 2449 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
c6490bf2 | 2450 | sym_addr, |
8b88a78e | 2451 | current_top_target ()); |
f9e14852 | 2452 | svr4_create_solib_event_breakpoints (target_gdbarch (), sym_addr); |
c6490bf2 KB |
2453 | return 1; |
2454 | } | |
13437d4b KB |
2455 | } |
2456 | } | |
542c95c2 | 2457 | return 0; |
13437d4b KB |
2458 | } |
2459 | ||
d1012b8e | 2460 | /* Read the ELF program headers from ABFD. */ |
e2a44558 | 2461 | |
d1012b8e SM |
2462 | static gdb::optional<gdb::byte_vector> |
2463 | read_program_headers_from_bfd (bfd *abfd) | |
e2a44558 | 2464 | { |
d1012b8e SM |
2465 | Elf_Internal_Ehdr *ehdr = elf_elfheader (abfd); |
2466 | int phdrs_size = ehdr->e_phnum * ehdr->e_phentsize; | |
2467 | if (phdrs_size == 0) | |
2468 | return {}; | |
09919ac2 | 2469 | |
d1012b8e | 2470 | gdb::byte_vector buf (phdrs_size); |
09919ac2 | 2471 | if (bfd_seek (abfd, ehdr->e_phoff, SEEK_SET) != 0 |
d1012b8e SM |
2472 | || bfd_bread (buf.data (), phdrs_size, abfd) != phdrs_size) |
2473 | return {}; | |
09919ac2 JK |
2474 | |
2475 | return buf; | |
b8040f19 JK |
2476 | } |
2477 | ||
01c30d6e JK |
2478 | /* Return 1 and fill *DISPLACEMENTP with detected PIE offset of inferior |
2479 | exec_bfd. Otherwise return 0. | |
2480 | ||
2481 | We relocate all of the sections by the same amount. This | |
c378eb4e | 2482 | behavior is mandated by recent editions of the System V ABI. |
b8040f19 JK |
2483 | According to the System V Application Binary Interface, |
2484 | Edition 4.1, page 5-5: | |
2485 | ||
2486 | ... Though the system chooses virtual addresses for | |
2487 | individual processes, it maintains the segments' relative | |
2488 | positions. Because position-independent code uses relative | |
2489 | addressesing between segments, the difference between | |
2490 | virtual addresses in memory must match the difference | |
2491 | between virtual addresses in the file. The difference | |
2492 | between the virtual address of any segment in memory and | |
2493 | the corresponding virtual address in the file is thus a | |
2494 | single constant value for any one executable or shared | |
2495 | object in a given process. This difference is the base | |
2496 | address. One use of the base address is to relocate the | |
2497 | memory image of the program during dynamic linking. | |
2498 | ||
2499 | The same language also appears in Edition 4.0 of the System V | |
09919ac2 JK |
2500 | ABI and is left unspecified in some of the earlier editions. |
2501 | ||
2502 | Decide if the objfile needs to be relocated. As indicated above, we will | |
2503 | only be here when execution is stopped. But during attachment PC can be at | |
2504 | arbitrary address therefore regcache_read_pc can be misleading (contrary to | |
2505 | the auxv AT_ENTRY value). Moreover for executable with interpreter section | |
2506 | regcache_read_pc would point to the interpreter and not the main executable. | |
2507 | ||
2508 | So, to summarize, relocations are necessary when the start address obtained | |
2509 | from the executable is different from the address in auxv AT_ENTRY entry. | |
d989b283 | 2510 | |
09919ac2 JK |
2511 | [ The astute reader will note that we also test to make sure that |
2512 | the executable in question has the DYNAMIC flag set. It is my | |
2513 | opinion that this test is unnecessary (undesirable even). It | |
2514 | was added to avoid inadvertent relocation of an executable | |
2515 | whose e_type member in the ELF header is not ET_DYN. There may | |
2516 | be a time in the future when it is desirable to do relocations | |
2517 | on other types of files as well in which case this condition | |
2518 | should either be removed or modified to accomodate the new file | |
2519 | type. - Kevin, Nov 2000. ] */ | |
b8040f19 | 2520 | |
01c30d6e JK |
2521 | static int |
2522 | svr4_exec_displacement (CORE_ADDR *displacementp) | |
b8040f19 | 2523 | { |
41752192 JK |
2524 | /* ENTRY_POINT is a possible function descriptor - before |
2525 | a call to gdbarch_convert_from_func_ptr_addr. */ | |
8f61baf8 | 2526 | CORE_ADDR entry_point, exec_displacement; |
b8040f19 JK |
2527 | |
2528 | if (exec_bfd == NULL) | |
2529 | return 0; | |
2530 | ||
09919ac2 JK |
2531 | /* Therefore for ELF it is ET_EXEC and not ET_DYN. Both shared libraries |
2532 | being executed themselves and PIE (Position Independent Executable) | |
2533 | executables are ET_DYN. */ | |
2534 | ||
2535 | if ((bfd_get_file_flags (exec_bfd) & DYNAMIC) == 0) | |
2536 | return 0; | |
2537 | ||
8b88a78e | 2538 | if (target_auxv_search (current_top_target (), AT_ENTRY, &entry_point) <= 0) |
09919ac2 JK |
2539 | return 0; |
2540 | ||
8f61baf8 | 2541 | exec_displacement = entry_point - bfd_get_start_address (exec_bfd); |
09919ac2 | 2542 | |
8f61baf8 | 2543 | /* Verify the EXEC_DISPLACEMENT candidate complies with the required page |
09919ac2 JK |
2544 | alignment. It is cheaper than the program headers comparison below. */ |
2545 | ||
2546 | if (bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
2547 | { | |
2548 | const struct elf_backend_data *elf = get_elf_backend_data (exec_bfd); | |
2549 | ||
2550 | /* p_align of PT_LOAD segments does not specify any alignment but | |
2551 | only congruency of addresses: | |
2552 | p_offset % p_align == p_vaddr % p_align | |
2553 | Kernel is free to load the executable with lower alignment. */ | |
2554 | ||
8f61baf8 | 2555 | if ((exec_displacement & (elf->minpagesize - 1)) != 0) |
09919ac2 JK |
2556 | return 0; |
2557 | } | |
2558 | ||
2559 | /* Verify that the auxilliary vector describes the same file as exec_bfd, by | |
2560 | comparing their program headers. If the program headers in the auxilliary | |
2561 | vector do not match the program headers in the executable, then we are | |
2562 | looking at a different file than the one used by the kernel - for | |
2563 | instance, "gdb program" connected to "gdbserver :PORT ld.so program". */ | |
2564 | ||
2565 | if (bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
2566 | { | |
d1012b8e | 2567 | /* Be optimistic and return 0 only if GDB was able to verify the headers |
09919ac2 | 2568 | really do not match. */ |
0a1e94c7 | 2569 | int arch_size; |
09919ac2 | 2570 | |
17658d46 SM |
2571 | gdb::optional<gdb::byte_vector> phdrs_target |
2572 | = read_program_header (-1, &arch_size, NULL); | |
d1012b8e SM |
2573 | gdb::optional<gdb::byte_vector> phdrs_binary |
2574 | = read_program_headers_from_bfd (exec_bfd); | |
2575 | if (phdrs_target && phdrs_binary) | |
0a1e94c7 | 2576 | { |
f5656ead | 2577 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
0a1e94c7 JK |
2578 | |
2579 | /* We are dealing with three different addresses. EXEC_BFD | |
2580 | represents current address in on-disk file. target memory content | |
2581 | may be different from EXEC_BFD as the file may have been prelinked | |
2582 | to a different address after the executable has been loaded. | |
2583 | Moreover the address of placement in target memory can be | |
3e43a32a MS |
2584 | different from what the program headers in target memory say - |
2585 | this is the goal of PIE. | |
0a1e94c7 JK |
2586 | |
2587 | Detected DISPLACEMENT covers both the offsets of PIE placement and | |
2588 | possible new prelink performed after start of the program. Here | |
2589 | relocate BUF and BUF2 just by the EXEC_BFD vs. target memory | |
2590 | content offset for the verification purpose. */ | |
2591 | ||
d1012b8e | 2592 | if (phdrs_target->size () != phdrs_binary->size () |
0a1e94c7 | 2593 | || bfd_get_arch_size (exec_bfd) != arch_size) |
d1012b8e | 2594 | return 0; |
3e43a32a | 2595 | else if (arch_size == 32 |
17658d46 SM |
2596 | && phdrs_target->size () >= sizeof (Elf32_External_Phdr) |
2597 | && phdrs_target->size () % sizeof (Elf32_External_Phdr) == 0) | |
0a1e94c7 JK |
2598 | { |
2599 | Elf_Internal_Ehdr *ehdr2 = elf_tdata (exec_bfd)->elf_header; | |
2600 | Elf_Internal_Phdr *phdr2 = elf_tdata (exec_bfd)->phdr; | |
2601 | CORE_ADDR displacement = 0; | |
2602 | int i; | |
2603 | ||
2604 | /* DISPLACEMENT could be found more easily by the difference of | |
2605 | ehdr2->e_entry. But we haven't read the ehdr yet, and we | |
2606 | already have enough information to compute that displacement | |
2607 | with what we've read. */ | |
2608 | ||
2609 | for (i = 0; i < ehdr2->e_phnum; i++) | |
2610 | if (phdr2[i].p_type == PT_LOAD) | |
2611 | { | |
2612 | Elf32_External_Phdr *phdrp; | |
2613 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
2614 | CORE_ADDR vaddr, paddr; | |
2615 | CORE_ADDR displacement_vaddr = 0; | |
2616 | CORE_ADDR displacement_paddr = 0; | |
2617 | ||
17658d46 | 2618 | phdrp = &((Elf32_External_Phdr *) phdrs_target->data ())[i]; |
0a1e94c7 JK |
2619 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; |
2620 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
2621 | ||
2622 | vaddr = extract_unsigned_integer (buf_vaddr_p, 4, | |
2623 | byte_order); | |
2624 | displacement_vaddr = vaddr - phdr2[i].p_vaddr; | |
2625 | ||
2626 | paddr = extract_unsigned_integer (buf_paddr_p, 4, | |
2627 | byte_order); | |
2628 | displacement_paddr = paddr - phdr2[i].p_paddr; | |
2629 | ||
2630 | if (displacement_vaddr == displacement_paddr) | |
2631 | displacement = displacement_vaddr; | |
2632 | ||
2633 | break; | |
2634 | } | |
2635 | ||
17658d46 SM |
2636 | /* Now compare program headers from the target and the binary |
2637 | with optional DISPLACEMENT. */ | |
0a1e94c7 | 2638 | |
17658d46 SM |
2639 | for (i = 0; |
2640 | i < phdrs_target->size () / sizeof (Elf32_External_Phdr); | |
2641 | i++) | |
0a1e94c7 JK |
2642 | { |
2643 | Elf32_External_Phdr *phdrp; | |
2644 | Elf32_External_Phdr *phdr2p; | |
2645 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
2646 | CORE_ADDR vaddr, paddr; | |
43b8e241 | 2647 | asection *plt2_asect; |
0a1e94c7 | 2648 | |
17658d46 | 2649 | phdrp = &((Elf32_External_Phdr *) phdrs_target->data ())[i]; |
0a1e94c7 JK |
2650 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; |
2651 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
d1012b8e | 2652 | phdr2p = &((Elf32_External_Phdr *) phdrs_binary->data ())[i]; |
0a1e94c7 JK |
2653 | |
2654 | /* PT_GNU_STACK is an exception by being never relocated by | |
2655 | prelink as its addresses are always zero. */ | |
2656 | ||
2657 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2658 | continue; | |
2659 | ||
2660 | /* Check also other adjustment combinations - PR 11786. */ | |
2661 | ||
3e43a32a MS |
2662 | vaddr = extract_unsigned_integer (buf_vaddr_p, 4, |
2663 | byte_order); | |
0a1e94c7 JK |
2664 | vaddr -= displacement; |
2665 | store_unsigned_integer (buf_vaddr_p, 4, byte_order, vaddr); | |
2666 | ||
3e43a32a MS |
2667 | paddr = extract_unsigned_integer (buf_paddr_p, 4, |
2668 | byte_order); | |
0a1e94c7 JK |
2669 | paddr -= displacement; |
2670 | store_unsigned_integer (buf_paddr_p, 4, byte_order, paddr); | |
2671 | ||
2672 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2673 | continue; | |
2674 | ||
204b5331 DE |
2675 | /* Strip modifies the flags and alignment of PT_GNU_RELRO. |
2676 | CentOS-5 has problems with filesz, memsz as well. | |
be2d111a | 2677 | Strip also modifies memsz of PT_TLS. |
204b5331 | 2678 | See PR 11786. */ |
c44deb73 SM |
2679 | if (phdr2[i].p_type == PT_GNU_RELRO |
2680 | || phdr2[i].p_type == PT_TLS) | |
204b5331 DE |
2681 | { |
2682 | Elf32_External_Phdr tmp_phdr = *phdrp; | |
2683 | Elf32_External_Phdr tmp_phdr2 = *phdr2p; | |
2684 | ||
2685 | memset (tmp_phdr.p_filesz, 0, 4); | |
2686 | memset (tmp_phdr.p_memsz, 0, 4); | |
2687 | memset (tmp_phdr.p_flags, 0, 4); | |
2688 | memset (tmp_phdr.p_align, 0, 4); | |
2689 | memset (tmp_phdr2.p_filesz, 0, 4); | |
2690 | memset (tmp_phdr2.p_memsz, 0, 4); | |
2691 | memset (tmp_phdr2.p_flags, 0, 4); | |
2692 | memset (tmp_phdr2.p_align, 0, 4); | |
2693 | ||
2694 | if (memcmp (&tmp_phdr, &tmp_phdr2, sizeof (tmp_phdr)) | |
2695 | == 0) | |
2696 | continue; | |
2697 | } | |
2698 | ||
43b8e241 JK |
2699 | /* prelink can convert .plt SHT_NOBITS to SHT_PROGBITS. */ |
2700 | plt2_asect = bfd_get_section_by_name (exec_bfd, ".plt"); | |
2701 | if (plt2_asect) | |
2702 | { | |
2703 | int content2; | |
2704 | gdb_byte *buf_filesz_p = (gdb_byte *) &phdrp->p_filesz; | |
2705 | CORE_ADDR filesz; | |
2706 | ||
2707 | content2 = (bfd_get_section_flags (exec_bfd, plt2_asect) | |
2708 | & SEC_HAS_CONTENTS) != 0; | |
2709 | ||
2710 | filesz = extract_unsigned_integer (buf_filesz_p, 4, | |
2711 | byte_order); | |
2712 | ||
2713 | /* PLT2_ASECT is from on-disk file (exec_bfd) while | |
2714 | FILESZ is from the in-memory image. */ | |
2715 | if (content2) | |
2716 | filesz += bfd_get_section_size (plt2_asect); | |
2717 | else | |
2718 | filesz -= bfd_get_section_size (plt2_asect); | |
2719 | ||
2720 | store_unsigned_integer (buf_filesz_p, 4, byte_order, | |
2721 | filesz); | |
2722 | ||
2723 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2724 | continue; | |
2725 | } | |
2726 | ||
d1012b8e | 2727 | return 0; |
0a1e94c7 JK |
2728 | } |
2729 | } | |
3e43a32a | 2730 | else if (arch_size == 64 |
17658d46 SM |
2731 | && phdrs_target->size () >= sizeof (Elf64_External_Phdr) |
2732 | && phdrs_target->size () % sizeof (Elf64_External_Phdr) == 0) | |
0a1e94c7 JK |
2733 | { |
2734 | Elf_Internal_Ehdr *ehdr2 = elf_tdata (exec_bfd)->elf_header; | |
2735 | Elf_Internal_Phdr *phdr2 = elf_tdata (exec_bfd)->phdr; | |
2736 | CORE_ADDR displacement = 0; | |
2737 | int i; | |
2738 | ||
2739 | /* DISPLACEMENT could be found more easily by the difference of | |
2740 | ehdr2->e_entry. But we haven't read the ehdr yet, and we | |
2741 | already have enough information to compute that displacement | |
2742 | with what we've read. */ | |
2743 | ||
2744 | for (i = 0; i < ehdr2->e_phnum; i++) | |
2745 | if (phdr2[i].p_type == PT_LOAD) | |
2746 | { | |
2747 | Elf64_External_Phdr *phdrp; | |
2748 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
2749 | CORE_ADDR vaddr, paddr; | |
2750 | CORE_ADDR displacement_vaddr = 0; | |
2751 | CORE_ADDR displacement_paddr = 0; | |
2752 | ||
17658d46 | 2753 | phdrp = &((Elf64_External_Phdr *) phdrs_target->data ())[i]; |
0a1e94c7 JK |
2754 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; |
2755 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
2756 | ||
2757 | vaddr = extract_unsigned_integer (buf_vaddr_p, 8, | |
2758 | byte_order); | |
2759 | displacement_vaddr = vaddr - phdr2[i].p_vaddr; | |
2760 | ||
2761 | paddr = extract_unsigned_integer (buf_paddr_p, 8, | |
2762 | byte_order); | |
2763 | displacement_paddr = paddr - phdr2[i].p_paddr; | |
2764 | ||
2765 | if (displacement_vaddr == displacement_paddr) | |
2766 | displacement = displacement_vaddr; | |
2767 | ||
2768 | break; | |
2769 | } | |
2770 | ||
2771 | /* Now compare BUF and BUF2 with optional DISPLACEMENT. */ | |
2772 | ||
17658d46 SM |
2773 | for (i = 0; |
2774 | i < phdrs_target->size () / sizeof (Elf64_External_Phdr); | |
2775 | i++) | |
0a1e94c7 JK |
2776 | { |
2777 | Elf64_External_Phdr *phdrp; | |
2778 | Elf64_External_Phdr *phdr2p; | |
2779 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
2780 | CORE_ADDR vaddr, paddr; | |
43b8e241 | 2781 | asection *plt2_asect; |
0a1e94c7 | 2782 | |
17658d46 | 2783 | phdrp = &((Elf64_External_Phdr *) phdrs_target->data ())[i]; |
0a1e94c7 JK |
2784 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; |
2785 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
d1012b8e | 2786 | phdr2p = &((Elf64_External_Phdr *) phdrs_binary->data ())[i]; |
0a1e94c7 JK |
2787 | |
2788 | /* PT_GNU_STACK is an exception by being never relocated by | |
2789 | prelink as its addresses are always zero. */ | |
2790 | ||
2791 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2792 | continue; | |
2793 | ||
2794 | /* Check also other adjustment combinations - PR 11786. */ | |
2795 | ||
3e43a32a MS |
2796 | vaddr = extract_unsigned_integer (buf_vaddr_p, 8, |
2797 | byte_order); | |
0a1e94c7 JK |
2798 | vaddr -= displacement; |
2799 | store_unsigned_integer (buf_vaddr_p, 8, byte_order, vaddr); | |
2800 | ||
3e43a32a MS |
2801 | paddr = extract_unsigned_integer (buf_paddr_p, 8, |
2802 | byte_order); | |
0a1e94c7 JK |
2803 | paddr -= displacement; |
2804 | store_unsigned_integer (buf_paddr_p, 8, byte_order, paddr); | |
2805 | ||
2806 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2807 | continue; | |
2808 | ||
204b5331 DE |
2809 | /* Strip modifies the flags and alignment of PT_GNU_RELRO. |
2810 | CentOS-5 has problems with filesz, memsz as well. | |
be2d111a | 2811 | Strip also modifies memsz of PT_TLS. |
204b5331 | 2812 | See PR 11786. */ |
c44deb73 SM |
2813 | if (phdr2[i].p_type == PT_GNU_RELRO |
2814 | || phdr2[i].p_type == PT_TLS) | |
204b5331 DE |
2815 | { |
2816 | Elf64_External_Phdr tmp_phdr = *phdrp; | |
2817 | Elf64_External_Phdr tmp_phdr2 = *phdr2p; | |
2818 | ||
2819 | memset (tmp_phdr.p_filesz, 0, 8); | |
2820 | memset (tmp_phdr.p_memsz, 0, 8); | |
2821 | memset (tmp_phdr.p_flags, 0, 4); | |
2822 | memset (tmp_phdr.p_align, 0, 8); | |
2823 | memset (tmp_phdr2.p_filesz, 0, 8); | |
2824 | memset (tmp_phdr2.p_memsz, 0, 8); | |
2825 | memset (tmp_phdr2.p_flags, 0, 4); | |
2826 | memset (tmp_phdr2.p_align, 0, 8); | |
2827 | ||
2828 | if (memcmp (&tmp_phdr, &tmp_phdr2, sizeof (tmp_phdr)) | |
2829 | == 0) | |
2830 | continue; | |
2831 | } | |
2832 | ||
43b8e241 JK |
2833 | /* prelink can convert .plt SHT_NOBITS to SHT_PROGBITS. */ |
2834 | plt2_asect = bfd_get_section_by_name (exec_bfd, ".plt"); | |
2835 | if (plt2_asect) | |
2836 | { | |
2837 | int content2; | |
2838 | gdb_byte *buf_filesz_p = (gdb_byte *) &phdrp->p_filesz; | |
2839 | CORE_ADDR filesz; | |
2840 | ||
2841 | content2 = (bfd_get_section_flags (exec_bfd, plt2_asect) | |
2842 | & SEC_HAS_CONTENTS) != 0; | |
2843 | ||
2844 | filesz = extract_unsigned_integer (buf_filesz_p, 8, | |
2845 | byte_order); | |
2846 | ||
2847 | /* PLT2_ASECT is from on-disk file (exec_bfd) while | |
2848 | FILESZ is from the in-memory image. */ | |
2849 | if (content2) | |
2850 | filesz += bfd_get_section_size (plt2_asect); | |
2851 | else | |
2852 | filesz -= bfd_get_section_size (plt2_asect); | |
2853 | ||
2854 | store_unsigned_integer (buf_filesz_p, 8, byte_order, | |
2855 | filesz); | |
2856 | ||
2857 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2858 | continue; | |
2859 | } | |
2860 | ||
d1012b8e | 2861 | return 0; |
0a1e94c7 JK |
2862 | } |
2863 | } | |
2864 | else | |
d1012b8e | 2865 | return 0; |
0a1e94c7 | 2866 | } |
09919ac2 | 2867 | } |
b8040f19 | 2868 | |
ccf26247 JK |
2869 | if (info_verbose) |
2870 | { | |
2871 | /* It can be printed repeatedly as there is no easy way to check | |
2872 | the executable symbols/file has been already relocated to | |
2873 | displacement. */ | |
2874 | ||
2875 | printf_unfiltered (_("Using PIE (Position Independent Executable) " | |
2876 | "displacement %s for \"%s\".\n"), | |
8f61baf8 | 2877 | paddress (target_gdbarch (), exec_displacement), |
ccf26247 JK |
2878 | bfd_get_filename (exec_bfd)); |
2879 | } | |
2880 | ||
8f61baf8 | 2881 | *displacementp = exec_displacement; |
01c30d6e | 2882 | return 1; |
b8040f19 JK |
2883 | } |
2884 | ||
2885 | /* Relocate the main executable. This function should be called upon | |
c378eb4e | 2886 | stopping the inferior process at the entry point to the program. |
b8040f19 JK |
2887 | The entry point from BFD is compared to the AT_ENTRY of AUXV and if they are |
2888 | different, the main executable is relocated by the proper amount. */ | |
2889 | ||
2890 | static void | |
2891 | svr4_relocate_main_executable (void) | |
2892 | { | |
01c30d6e JK |
2893 | CORE_ADDR displacement; |
2894 | ||
4e5799b6 JK |
2895 | /* If we are re-running this executable, SYMFILE_OBJFILE->SECTION_OFFSETS |
2896 | probably contains the offsets computed using the PIE displacement | |
2897 | from the previous run, which of course are irrelevant for this run. | |
2898 | So we need to determine the new PIE displacement and recompute the | |
2899 | section offsets accordingly, even if SYMFILE_OBJFILE->SECTION_OFFSETS | |
2900 | already contains pre-computed offsets. | |
01c30d6e | 2901 | |
4e5799b6 | 2902 | If we cannot compute the PIE displacement, either: |
01c30d6e | 2903 | |
4e5799b6 JK |
2904 | - The executable is not PIE. |
2905 | ||
2906 | - SYMFILE_OBJFILE does not match the executable started in the target. | |
2907 | This can happen for main executable symbols loaded at the host while | |
2908 | `ld.so --ld-args main-executable' is loaded in the target. | |
2909 | ||
2910 | Then we leave the section offsets untouched and use them as is for | |
2911 | this run. Either: | |
2912 | ||
2913 | - These section offsets were properly reset earlier, and thus | |
2914 | already contain the correct values. This can happen for instance | |
2915 | when reconnecting via the remote protocol to a target that supports | |
2916 | the `qOffsets' packet. | |
2917 | ||
2918 | - The section offsets were not reset earlier, and the best we can | |
c378eb4e | 2919 | hope is that the old offsets are still applicable to the new run. */ |
01c30d6e JK |
2920 | |
2921 | if (! svr4_exec_displacement (&displacement)) | |
2922 | return; | |
b8040f19 | 2923 | |
01c30d6e JK |
2924 | /* Even DISPLACEMENT 0 is a valid new difference of in-memory vs. in-file |
2925 | addresses. */ | |
b8040f19 JK |
2926 | |
2927 | if (symfile_objfile) | |
e2a44558 | 2928 | { |
e2a44558 | 2929 | struct section_offsets *new_offsets; |
b8040f19 | 2930 | int i; |
e2a44558 | 2931 | |
224c3ddb SM |
2932 | new_offsets = XALLOCAVEC (struct section_offsets, |
2933 | symfile_objfile->num_sections); | |
e2a44558 | 2934 | |
b8040f19 JK |
2935 | for (i = 0; i < symfile_objfile->num_sections; i++) |
2936 | new_offsets->offsets[i] = displacement; | |
e2a44558 | 2937 | |
b8040f19 | 2938 | objfile_relocate (symfile_objfile, new_offsets); |
e2a44558 | 2939 | } |
51bee8e9 JK |
2940 | else if (exec_bfd) |
2941 | { | |
2942 | asection *asect; | |
2943 | ||
2944 | for (asect = exec_bfd->sections; asect != NULL; asect = asect->next) | |
2945 | exec_set_section_address (bfd_get_filename (exec_bfd), asect->index, | |
2946 | (bfd_section_vma (exec_bfd, asect) | |
2947 | + displacement)); | |
2948 | } | |
e2a44558 KB |
2949 | } |
2950 | ||
7f86f058 | 2951 | /* Implement the "create_inferior_hook" target_solib_ops method. |
13437d4b KB |
2952 | |
2953 | For SVR4 executables, this first instruction is either the first | |
2954 | instruction in the dynamic linker (for dynamically linked | |
2955 | executables) or the instruction at "start" for statically linked | |
2956 | executables. For dynamically linked executables, the system | |
2957 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
2958 | and starts it running. The dynamic linker maps in any needed | |
2959 | shared libraries, maps in the actual user executable, and then | |
2960 | jumps to "start" in the user executable. | |
2961 | ||
7f86f058 PA |
2962 | We can arrange to cooperate with the dynamic linker to discover the |
2963 | names of shared libraries that are dynamically linked, and the base | |
2964 | addresses to which they are linked. | |
13437d4b KB |
2965 | |
2966 | This function is responsible for discovering those names and | |
2967 | addresses, and saving sufficient information about them to allow | |
d2e5c99a | 2968 | their symbols to be read at a later time. */ |
13437d4b | 2969 | |
e2a44558 | 2970 | static void |
268a4a75 | 2971 | svr4_solib_create_inferior_hook (int from_tty) |
13437d4b | 2972 | { |
1a816a87 PA |
2973 | struct svr4_info *info; |
2974 | ||
6c95b8df | 2975 | info = get_svr4_info (); |
2020b7ab | 2976 | |
f9e14852 GB |
2977 | /* Clear the probes-based interface's state. */ |
2978 | free_probes_table (info); | |
2979 | free_solib_list (info); | |
2980 | ||
e2a44558 | 2981 | /* Relocate the main executable if necessary. */ |
86e4bafc | 2982 | svr4_relocate_main_executable (); |
e2a44558 | 2983 | |
c91c8c16 PA |
2984 | /* No point setting a breakpoint in the dynamic linker if we can't |
2985 | hit it (e.g., a core file, or a trace file). */ | |
2986 | if (!target_has_execution) | |
2987 | return; | |
2988 | ||
d5a921c9 | 2989 | if (!svr4_have_link_map_offsets ()) |
513f5903 | 2990 | return; |
d5a921c9 | 2991 | |
268a4a75 | 2992 | if (!enable_break (info, from_tty)) |
542c95c2 | 2993 | return; |
13437d4b KB |
2994 | } |
2995 | ||
2996 | static void | |
2997 | svr4_clear_solib (void) | |
2998 | { | |
6c95b8df PA |
2999 | struct svr4_info *info; |
3000 | ||
3001 | info = get_svr4_info (); | |
3002 | info->debug_base = 0; | |
3003 | info->debug_loader_offset_p = 0; | |
3004 | info->debug_loader_offset = 0; | |
3005 | xfree (info->debug_loader_name); | |
3006 | info->debug_loader_name = NULL; | |
13437d4b KB |
3007 | } |
3008 | ||
6bb7be43 JB |
3009 | /* Clear any bits of ADDR that wouldn't fit in a target-format |
3010 | data pointer. "Data pointer" here refers to whatever sort of | |
3011 | address the dynamic linker uses to manage its sections. At the | |
3012 | moment, we don't support shared libraries on any processors where | |
3013 | code and data pointers are different sizes. | |
3014 | ||
3015 | This isn't really the right solution. What we really need here is | |
3016 | a way to do arithmetic on CORE_ADDR values that respects the | |
3017 | natural pointer/address correspondence. (For example, on the MIPS, | |
3018 | converting a 32-bit pointer to a 64-bit CORE_ADDR requires you to | |
3019 | sign-extend the value. There, simply truncating the bits above | |
819844ad | 3020 | gdbarch_ptr_bit, as we do below, is no good.) This should probably |
6bb7be43 JB |
3021 | be a new gdbarch method or something. */ |
3022 | static CORE_ADDR | |
3023 | svr4_truncate_ptr (CORE_ADDR addr) | |
3024 | { | |
f5656ead | 3025 | if (gdbarch_ptr_bit (target_gdbarch ()) == sizeof (CORE_ADDR) * 8) |
6bb7be43 JB |
3026 | /* We don't need to truncate anything, and the bit twiddling below |
3027 | will fail due to overflow problems. */ | |
3028 | return addr; | |
3029 | else | |
f5656ead | 3030 | return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch ())) - 1); |
6bb7be43 JB |
3031 | } |
3032 | ||
3033 | ||
749499cb KB |
3034 | static void |
3035 | svr4_relocate_section_addresses (struct so_list *so, | |
0542c86d | 3036 | struct target_section *sec) |
749499cb | 3037 | { |
2b2848e2 DE |
3038 | bfd *abfd = sec->the_bfd_section->owner; |
3039 | ||
3040 | sec->addr = svr4_truncate_ptr (sec->addr + lm_addr_check (so, abfd)); | |
3041 | sec->endaddr = svr4_truncate_ptr (sec->endaddr + lm_addr_check (so, abfd)); | |
749499cb | 3042 | } |
4b188b9f | 3043 | \f |
749499cb | 3044 | |
4b188b9f | 3045 | /* Architecture-specific operations. */ |
6bb7be43 | 3046 | |
4b188b9f MK |
3047 | /* Per-architecture data key. */ |
3048 | static struct gdbarch_data *solib_svr4_data; | |
e5e2b9ff | 3049 | |
4b188b9f | 3050 | struct solib_svr4_ops |
e5e2b9ff | 3051 | { |
4b188b9f MK |
3052 | /* Return a description of the layout of `struct link_map'. */ |
3053 | struct link_map_offsets *(*fetch_link_map_offsets)(void); | |
3054 | }; | |
e5e2b9ff | 3055 | |
4b188b9f | 3056 | /* Return a default for the architecture-specific operations. */ |
e5e2b9ff | 3057 | |
4b188b9f MK |
3058 | static void * |
3059 | solib_svr4_init (struct obstack *obstack) | |
e5e2b9ff | 3060 | { |
4b188b9f | 3061 | struct solib_svr4_ops *ops; |
e5e2b9ff | 3062 | |
4b188b9f | 3063 | ops = OBSTACK_ZALLOC (obstack, struct solib_svr4_ops); |
8d005789 | 3064 | ops->fetch_link_map_offsets = NULL; |
4b188b9f | 3065 | return ops; |
e5e2b9ff KB |
3066 | } |
3067 | ||
4b188b9f | 3068 | /* Set the architecture-specific `struct link_map_offsets' fetcher for |
7e3cb44c | 3069 | GDBARCH to FLMO. Also, install SVR4 solib_ops into GDBARCH. */ |
1c4dcb57 | 3070 | |
21479ded | 3071 | void |
e5e2b9ff KB |
3072 | set_solib_svr4_fetch_link_map_offsets (struct gdbarch *gdbarch, |
3073 | struct link_map_offsets *(*flmo) (void)) | |
21479ded | 3074 | { |
19ba03f4 SM |
3075 | struct solib_svr4_ops *ops |
3076 | = (struct solib_svr4_ops *) gdbarch_data (gdbarch, solib_svr4_data); | |
4b188b9f MK |
3077 | |
3078 | ops->fetch_link_map_offsets = flmo; | |
7e3cb44c UW |
3079 | |
3080 | set_solib_ops (gdbarch, &svr4_so_ops); | |
21479ded KB |
3081 | } |
3082 | ||
4b188b9f MK |
3083 | /* Fetch a link_map_offsets structure using the architecture-specific |
3084 | `struct link_map_offsets' fetcher. */ | |
1c4dcb57 | 3085 | |
4b188b9f MK |
3086 | static struct link_map_offsets * |
3087 | svr4_fetch_link_map_offsets (void) | |
21479ded | 3088 | { |
19ba03f4 SM |
3089 | struct solib_svr4_ops *ops |
3090 | = (struct solib_svr4_ops *) gdbarch_data (target_gdbarch (), | |
3091 | solib_svr4_data); | |
4b188b9f MK |
3092 | |
3093 | gdb_assert (ops->fetch_link_map_offsets); | |
3094 | return ops->fetch_link_map_offsets (); | |
21479ded KB |
3095 | } |
3096 | ||
4b188b9f MK |
3097 | /* Return 1 if a link map offset fetcher has been defined, 0 otherwise. */ |
3098 | ||
3099 | static int | |
3100 | svr4_have_link_map_offsets (void) | |
3101 | { | |
19ba03f4 SM |
3102 | struct solib_svr4_ops *ops |
3103 | = (struct solib_svr4_ops *) gdbarch_data (target_gdbarch (), | |
3104 | solib_svr4_data); | |
433759f7 | 3105 | |
4b188b9f MK |
3106 | return (ops->fetch_link_map_offsets != NULL); |
3107 | } | |
3108 | \f | |
3109 | ||
e4bbbda8 MK |
3110 | /* Most OS'es that have SVR4-style ELF dynamic libraries define a |
3111 | `struct r_debug' and a `struct link_map' that are binary compatible | |
3112 | with the origional SVR4 implementation. */ | |
3113 | ||
3114 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
3115 | for an ILP32 SVR4 system. */ | |
d989b283 | 3116 | |
e4bbbda8 MK |
3117 | struct link_map_offsets * |
3118 | svr4_ilp32_fetch_link_map_offsets (void) | |
3119 | { | |
3120 | static struct link_map_offsets lmo; | |
3121 | static struct link_map_offsets *lmp = NULL; | |
3122 | ||
3123 | if (lmp == NULL) | |
3124 | { | |
3125 | lmp = &lmo; | |
3126 | ||
e4cd0d6a MK |
3127 | lmo.r_version_offset = 0; |
3128 | lmo.r_version_size = 4; | |
e4bbbda8 | 3129 | lmo.r_map_offset = 4; |
7cd25cfc | 3130 | lmo.r_brk_offset = 8; |
e4cd0d6a | 3131 | lmo.r_ldsomap_offset = 20; |
e4bbbda8 MK |
3132 | |
3133 | /* Everything we need is in the first 20 bytes. */ | |
3134 | lmo.link_map_size = 20; | |
3135 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 3136 | lmo.l_name_offset = 4; |
cc10cae3 | 3137 | lmo.l_ld_offset = 8; |
e4bbbda8 | 3138 | lmo.l_next_offset = 12; |
e4bbbda8 | 3139 | lmo.l_prev_offset = 16; |
e4bbbda8 MK |
3140 | } |
3141 | ||
3142 | return lmp; | |
3143 | } | |
3144 | ||
3145 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
3146 | for an LP64 SVR4 system. */ | |
d989b283 | 3147 | |
e4bbbda8 MK |
3148 | struct link_map_offsets * |
3149 | svr4_lp64_fetch_link_map_offsets (void) | |
3150 | { | |
3151 | static struct link_map_offsets lmo; | |
3152 | static struct link_map_offsets *lmp = NULL; | |
3153 | ||
3154 | if (lmp == NULL) | |
3155 | { | |
3156 | lmp = &lmo; | |
3157 | ||
e4cd0d6a MK |
3158 | lmo.r_version_offset = 0; |
3159 | lmo.r_version_size = 4; | |
e4bbbda8 | 3160 | lmo.r_map_offset = 8; |
7cd25cfc | 3161 | lmo.r_brk_offset = 16; |
e4cd0d6a | 3162 | lmo.r_ldsomap_offset = 40; |
e4bbbda8 MK |
3163 | |
3164 | /* Everything we need is in the first 40 bytes. */ | |
3165 | lmo.link_map_size = 40; | |
3166 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 3167 | lmo.l_name_offset = 8; |
cc10cae3 | 3168 | lmo.l_ld_offset = 16; |
e4bbbda8 | 3169 | lmo.l_next_offset = 24; |
e4bbbda8 | 3170 | lmo.l_prev_offset = 32; |
e4bbbda8 MK |
3171 | } |
3172 | ||
3173 | return lmp; | |
3174 | } | |
3175 | \f | |
3176 | ||
7d522c90 | 3177 | struct target_so_ops svr4_so_ops; |
13437d4b | 3178 | |
c378eb4e | 3179 | /* Lookup global symbol for ELF DSOs linked with -Bsymbolic. Those DSOs have a |
3a40aaa0 UW |
3180 | different rule for symbol lookup. The lookup begins here in the DSO, not in |
3181 | the main executable. */ | |
3182 | ||
d12307c1 | 3183 | static struct block_symbol |
efad9b6a | 3184 | elf_lookup_lib_symbol (struct objfile *objfile, |
3a40aaa0 | 3185 | const char *name, |
21b556f4 | 3186 | const domain_enum domain) |
3a40aaa0 | 3187 | { |
61f0d762 JK |
3188 | bfd *abfd; |
3189 | ||
3190 | if (objfile == symfile_objfile) | |
3191 | abfd = exec_bfd; | |
3192 | else | |
3193 | { | |
3194 | /* OBJFILE should have been passed as the non-debug one. */ | |
3195 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
3196 | ||
3197 | abfd = objfile->obfd; | |
3198 | } | |
3199 | ||
a738da3a | 3200 | if (abfd == NULL || scan_dyntag (DT_SYMBOLIC, abfd, NULL, NULL) != 1) |
6640a367 | 3201 | return {}; |
3a40aaa0 | 3202 | |
94af9270 | 3203 | return lookup_global_symbol_from_objfile (objfile, name, domain); |
3a40aaa0 UW |
3204 | } |
3205 | ||
13437d4b KB |
3206 | void |
3207 | _initialize_svr4_solib (void) | |
3208 | { | |
4b188b9f | 3209 | solib_svr4_data = gdbarch_data_register_pre_init (solib_svr4_init); |
6c95b8df | 3210 | solib_svr4_pspace_data |
8e260fc0 | 3211 | = register_program_space_data_with_cleanup (NULL, svr4_pspace_data_cleanup); |
4b188b9f | 3212 | |
749499cb | 3213 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b | 3214 | svr4_so_ops.free_so = svr4_free_so; |
0892cb63 | 3215 | svr4_so_ops.clear_so = svr4_clear_so; |
13437d4b KB |
3216 | svr4_so_ops.clear_solib = svr4_clear_solib; |
3217 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
13437d4b KB |
3218 | svr4_so_ops.current_sos = svr4_current_sos; |
3219 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
d7fa2ae2 | 3220 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; |
831a0c44 | 3221 | svr4_so_ops.bfd_open = solib_bfd_open; |
3a40aaa0 | 3222 | svr4_so_ops.lookup_lib_global_symbol = elf_lookup_lib_symbol; |
a7c02bc8 | 3223 | svr4_so_ops.same = svr4_same; |
de18c1d8 | 3224 | svr4_so_ops.keep_data_in_core = svr4_keep_data_in_core; |
f9e14852 GB |
3225 | svr4_so_ops.update_breakpoints = svr4_update_solib_event_breakpoints; |
3226 | svr4_so_ops.handle_event = svr4_handle_solib_event; | |
13437d4b | 3227 | } |