Commit | Line | Data |
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ab31aa69 | 1 | /* Handle SVR4 shared libraries for GDB, the GNU Debugger. |
2f4950cd | 2 | |
28e7fd62 | 3 | Copyright (C) 1990-2013 Free Software Foundation, Inc. |
13437d4b KB |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
13437d4b KB |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
13437d4b | 19 | |
13437d4b KB |
20 | #include "defs.h" |
21 | ||
13437d4b | 22 | #include "elf/external.h" |
21479ded | 23 | #include "elf/common.h" |
f7856c8f | 24 | #include "elf/mips.h" |
13437d4b KB |
25 | |
26 | #include "symtab.h" | |
27 | #include "bfd.h" | |
28 | #include "symfile.h" | |
29 | #include "objfiles.h" | |
30 | #include "gdbcore.h" | |
13437d4b | 31 | #include "target.h" |
13437d4b | 32 | #include "inferior.h" |
fb14de7b | 33 | #include "regcache.h" |
2020b7ab | 34 | #include "gdbthread.h" |
1a816a87 | 35 | #include "observer.h" |
13437d4b | 36 | |
4b188b9f MK |
37 | #include "gdb_assert.h" |
38 | ||
13437d4b | 39 | #include "solist.h" |
bba93f6c | 40 | #include "solib.h" |
13437d4b KB |
41 | #include "solib-svr4.h" |
42 | ||
2f4950cd | 43 | #include "bfd-target.h" |
cc10cae3 | 44 | #include "elf-bfd.h" |
2f4950cd | 45 | #include "exec.h" |
8d4e36ba | 46 | #include "auxv.h" |
f1838a98 | 47 | #include "exceptions.h" |
695c3173 | 48 | #include "gdb_bfd.h" |
2f4950cd | 49 | |
e5e2b9ff | 50 | static struct link_map_offsets *svr4_fetch_link_map_offsets (void); |
d5a921c9 | 51 | static int svr4_have_link_map_offsets (void); |
9f2982ff | 52 | static void svr4_relocate_main_executable (void); |
1c4dcb57 | 53 | |
c378eb4e | 54 | /* Link map info to include in an allocated so_list entry. */ |
13437d4b KB |
55 | |
56 | struct lm_info | |
57 | { | |
cc10cae3 | 58 | /* Amount by which addresses in the binary should be relocated to |
3957565a JK |
59 | match the inferior. The direct inferior value is L_ADDR_INFERIOR. |
60 | When prelinking is involved and the prelink base address changes, | |
61 | we may need a different offset - the recomputed offset is in L_ADDR. | |
62 | It is commonly the same value. It is cached as we want to warn about | |
63 | the difference and compute it only once. L_ADDR is valid | |
64 | iff L_ADDR_P. */ | |
65 | CORE_ADDR l_addr, l_addr_inferior; | |
66 | unsigned int l_addr_p : 1; | |
93a57060 DJ |
67 | |
68 | /* The target location of lm. */ | |
69 | CORE_ADDR lm_addr; | |
3957565a JK |
70 | |
71 | /* Values read in from inferior's fields of the same name. */ | |
72 | CORE_ADDR l_ld, l_next, l_prev, l_name; | |
13437d4b KB |
73 | }; |
74 | ||
75 | /* On SVR4 systems, a list of symbols in the dynamic linker where | |
76 | GDB can try to place a breakpoint to monitor shared library | |
77 | events. | |
78 | ||
79 | If none of these symbols are found, or other errors occur, then | |
80 | SVR4 systems will fall back to using a symbol as the "startup | |
81 | mapping complete" breakpoint address. */ | |
82 | ||
bc043ef3 | 83 | static const char * const solib_break_names[] = |
13437d4b KB |
84 | { |
85 | "r_debug_state", | |
86 | "_r_debug_state", | |
87 | "_dl_debug_state", | |
88 | "rtld_db_dlactivity", | |
4c7dcb84 | 89 | "__dl_rtld_db_dlactivity", |
1f72e589 | 90 | "_rtld_debug_state", |
4c0122c8 | 91 | |
13437d4b KB |
92 | NULL |
93 | }; | |
13437d4b | 94 | |
bc043ef3 | 95 | static const char * const bkpt_names[] = |
13437d4b | 96 | { |
13437d4b | 97 | "_start", |
ad3dcc5c | 98 | "__start", |
13437d4b KB |
99 | "main", |
100 | NULL | |
101 | }; | |
13437d4b | 102 | |
bc043ef3 | 103 | static const char * const main_name_list[] = |
13437d4b KB |
104 | { |
105 | "main_$main", | |
106 | NULL | |
107 | }; | |
108 | ||
4d7b2d5b JB |
109 | /* Return non-zero if GDB_SO_NAME and INFERIOR_SO_NAME represent |
110 | the same shared library. */ | |
111 | ||
112 | static int | |
113 | svr4_same_1 (const char *gdb_so_name, const char *inferior_so_name) | |
114 | { | |
115 | if (strcmp (gdb_so_name, inferior_so_name) == 0) | |
116 | return 1; | |
117 | ||
118 | /* On Solaris, when starting inferior we think that dynamic linker is | |
d989b283 PP |
119 | /usr/lib/ld.so.1, but later on, the table of loaded shared libraries |
120 | contains /lib/ld.so.1. Sometimes one file is a link to another, but | |
4d7b2d5b JB |
121 | sometimes they have identical content, but are not linked to each |
122 | other. We don't restrict this check for Solaris, but the chances | |
123 | of running into this situation elsewhere are very low. */ | |
124 | if (strcmp (gdb_so_name, "/usr/lib/ld.so.1") == 0 | |
125 | && strcmp (inferior_so_name, "/lib/ld.so.1") == 0) | |
126 | return 1; | |
127 | ||
128 | /* Similarly, we observed the same issue with sparc64, but with | |
129 | different locations. */ | |
130 | if (strcmp (gdb_so_name, "/usr/lib/sparcv9/ld.so.1") == 0 | |
131 | && strcmp (inferior_so_name, "/lib/sparcv9/ld.so.1") == 0) | |
132 | return 1; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int | |
138 | svr4_same (struct so_list *gdb, struct so_list *inferior) | |
139 | { | |
140 | return (svr4_same_1 (gdb->so_original_name, inferior->so_original_name)); | |
141 | } | |
142 | ||
3957565a JK |
143 | static struct lm_info * |
144 | lm_info_read (CORE_ADDR lm_addr) | |
13437d4b | 145 | { |
4b188b9f | 146 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
3957565a JK |
147 | gdb_byte *lm; |
148 | struct lm_info *lm_info; | |
149 | struct cleanup *back_to; | |
150 | ||
151 | lm = xmalloc (lmo->link_map_size); | |
152 | back_to = make_cleanup (xfree, lm); | |
153 | ||
154 | if (target_read_memory (lm_addr, lm, lmo->link_map_size) != 0) | |
155 | { | |
156 | warning (_("Error reading shared library list entry at %s"), | |
f5656ead | 157 | paddress (target_gdbarch (), lm_addr)), |
3957565a JK |
158 | lm_info = NULL; |
159 | } | |
160 | else | |
161 | { | |
f5656ead | 162 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
13437d4b | 163 | |
3957565a JK |
164 | lm_info = xzalloc (sizeof (*lm_info)); |
165 | lm_info->lm_addr = lm_addr; | |
166 | ||
167 | lm_info->l_addr_inferior = extract_typed_address (&lm[lmo->l_addr_offset], | |
168 | ptr_type); | |
169 | lm_info->l_ld = extract_typed_address (&lm[lmo->l_ld_offset], ptr_type); | |
170 | lm_info->l_next = extract_typed_address (&lm[lmo->l_next_offset], | |
171 | ptr_type); | |
172 | lm_info->l_prev = extract_typed_address (&lm[lmo->l_prev_offset], | |
173 | ptr_type); | |
174 | lm_info->l_name = extract_typed_address (&lm[lmo->l_name_offset], | |
175 | ptr_type); | |
176 | } | |
177 | ||
178 | do_cleanups (back_to); | |
179 | ||
180 | return lm_info; | |
13437d4b KB |
181 | } |
182 | ||
cc10cae3 | 183 | static int |
b23518f0 | 184 | has_lm_dynamic_from_link_map (void) |
cc10cae3 AO |
185 | { |
186 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
187 | ||
cfaefc65 | 188 | return lmo->l_ld_offset >= 0; |
cc10cae3 AO |
189 | } |
190 | ||
cc10cae3 | 191 | static CORE_ADDR |
b23518f0 | 192 | lm_addr_check (struct so_list *so, bfd *abfd) |
cc10cae3 | 193 | { |
3957565a | 194 | if (!so->lm_info->l_addr_p) |
cc10cae3 AO |
195 | { |
196 | struct bfd_section *dyninfo_sect; | |
28f34a8f | 197 | CORE_ADDR l_addr, l_dynaddr, dynaddr; |
cc10cae3 | 198 | |
3957565a | 199 | l_addr = so->lm_info->l_addr_inferior; |
cc10cae3 | 200 | |
b23518f0 | 201 | if (! abfd || ! has_lm_dynamic_from_link_map ()) |
cc10cae3 AO |
202 | goto set_addr; |
203 | ||
3957565a | 204 | l_dynaddr = so->lm_info->l_ld; |
cc10cae3 AO |
205 | |
206 | dyninfo_sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
207 | if (dyninfo_sect == NULL) | |
208 | goto set_addr; | |
209 | ||
210 | dynaddr = bfd_section_vma (abfd, dyninfo_sect); | |
211 | ||
212 | if (dynaddr + l_addr != l_dynaddr) | |
213 | { | |
28f34a8f | 214 | CORE_ADDR align = 0x1000; |
4e1fc9c9 | 215 | CORE_ADDR minpagesize = align; |
28f34a8f | 216 | |
cc10cae3 AO |
217 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
218 | { | |
219 | Elf_Internal_Ehdr *ehdr = elf_tdata (abfd)->elf_header; | |
220 | Elf_Internal_Phdr *phdr = elf_tdata (abfd)->phdr; | |
221 | int i; | |
222 | ||
223 | align = 1; | |
224 | ||
225 | for (i = 0; i < ehdr->e_phnum; i++) | |
226 | if (phdr[i].p_type == PT_LOAD && phdr[i].p_align > align) | |
227 | align = phdr[i].p_align; | |
4e1fc9c9 JK |
228 | |
229 | minpagesize = get_elf_backend_data (abfd)->minpagesize; | |
cc10cae3 AO |
230 | } |
231 | ||
232 | /* Turn it into a mask. */ | |
233 | align--; | |
234 | ||
235 | /* If the changes match the alignment requirements, we | |
236 | assume we're using a core file that was generated by the | |
237 | same binary, just prelinked with a different base offset. | |
238 | If it doesn't match, we may have a different binary, the | |
239 | same binary with the dynamic table loaded at an unrelated | |
240 | location, or anything, really. To avoid regressions, | |
241 | don't adjust the base offset in the latter case, although | |
242 | odds are that, if things really changed, debugging won't | |
5c0d192f JK |
243 | quite work. |
244 | ||
245 | One could expect more the condition | |
246 | ((l_addr & align) == 0 && ((l_dynaddr - dynaddr) & align) == 0) | |
247 | but the one below is relaxed for PPC. The PPC kernel supports | |
248 | either 4k or 64k page sizes. To be prepared for 64k pages, | |
249 | PPC ELF files are built using an alignment requirement of 64k. | |
250 | However, when running on a kernel supporting 4k pages, the memory | |
251 | mapping of the library may not actually happen on a 64k boundary! | |
252 | ||
253 | (In the usual case where (l_addr & align) == 0, this check is | |
4e1fc9c9 JK |
254 | equivalent to the possibly expected check above.) |
255 | ||
256 | Even on PPC it must be zero-aligned at least for MINPAGESIZE. */ | |
5c0d192f | 257 | |
02835898 JK |
258 | l_addr = l_dynaddr - dynaddr; |
259 | ||
4e1fc9c9 JK |
260 | if ((l_addr & (minpagesize - 1)) == 0 |
261 | && (l_addr & align) == ((l_dynaddr - dynaddr) & align)) | |
cc10cae3 | 262 | { |
701ed6dc | 263 | if (info_verbose) |
ccf26247 JK |
264 | printf_unfiltered (_("Using PIC (Position Independent Code) " |
265 | "prelink displacement %s for \"%s\".\n"), | |
f5656ead | 266 | paddress (target_gdbarch (), l_addr), |
ccf26247 | 267 | so->so_name); |
cc10cae3 | 268 | } |
79d4c408 | 269 | else |
02835898 JK |
270 | { |
271 | /* There is no way to verify the library file matches. prelink | |
272 | can during prelinking of an unprelinked file (or unprelinking | |
273 | of a prelinked file) shift the DYNAMIC segment by arbitrary | |
274 | offset without any page size alignment. There is no way to | |
275 | find out the ELF header and/or Program Headers for a limited | |
276 | verification if it they match. One could do a verification | |
277 | of the DYNAMIC segment. Still the found address is the best | |
278 | one GDB could find. */ | |
279 | ||
280 | warning (_(".dynamic section for \"%s\" " | |
281 | "is not at the expected address " | |
282 | "(wrong library or version mismatch?)"), so->so_name); | |
283 | } | |
cc10cae3 AO |
284 | } |
285 | ||
286 | set_addr: | |
287 | so->lm_info->l_addr = l_addr; | |
3957565a | 288 | so->lm_info->l_addr_p = 1; |
cc10cae3 AO |
289 | } |
290 | ||
291 | return so->lm_info->l_addr; | |
292 | } | |
293 | ||
6c95b8df | 294 | /* Per pspace SVR4 specific data. */ |
13437d4b | 295 | |
1a816a87 PA |
296 | struct svr4_info |
297 | { | |
c378eb4e | 298 | CORE_ADDR debug_base; /* Base of dynamic linker structures. */ |
1a816a87 PA |
299 | |
300 | /* Validity flag for debug_loader_offset. */ | |
301 | int debug_loader_offset_p; | |
302 | ||
303 | /* Load address for the dynamic linker, inferred. */ | |
304 | CORE_ADDR debug_loader_offset; | |
305 | ||
306 | /* Name of the dynamic linker, valid if debug_loader_offset_p. */ | |
307 | char *debug_loader_name; | |
308 | ||
309 | /* Load map address for the main executable. */ | |
310 | CORE_ADDR main_lm_addr; | |
1a816a87 | 311 | |
6c95b8df PA |
312 | CORE_ADDR interp_text_sect_low; |
313 | CORE_ADDR interp_text_sect_high; | |
314 | CORE_ADDR interp_plt_sect_low; | |
315 | CORE_ADDR interp_plt_sect_high; | |
316 | }; | |
1a816a87 | 317 | |
6c95b8df PA |
318 | /* Per-program-space data key. */ |
319 | static const struct program_space_data *solib_svr4_pspace_data; | |
1a816a87 | 320 | |
6c95b8df PA |
321 | static void |
322 | svr4_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
1a816a87 | 323 | { |
6c95b8df | 324 | struct svr4_info *info; |
1a816a87 | 325 | |
6c95b8df PA |
326 | info = program_space_data (pspace, solib_svr4_pspace_data); |
327 | xfree (info); | |
1a816a87 PA |
328 | } |
329 | ||
6c95b8df PA |
330 | /* Get the current svr4 data. If none is found yet, add it now. This |
331 | function always returns a valid object. */ | |
34439770 | 332 | |
6c95b8df PA |
333 | static struct svr4_info * |
334 | get_svr4_info (void) | |
1a816a87 | 335 | { |
6c95b8df | 336 | struct svr4_info *info; |
1a816a87 | 337 | |
6c95b8df PA |
338 | info = program_space_data (current_program_space, solib_svr4_pspace_data); |
339 | if (info != NULL) | |
340 | return info; | |
34439770 | 341 | |
6c95b8df PA |
342 | info = XZALLOC (struct svr4_info); |
343 | set_program_space_data (current_program_space, solib_svr4_pspace_data, info); | |
344 | return info; | |
1a816a87 | 345 | } |
93a57060 | 346 | |
13437d4b KB |
347 | /* Local function prototypes */ |
348 | ||
bc043ef3 | 349 | static int match_main (const char *); |
13437d4b | 350 | |
97ec2c2f UW |
351 | /* Read program header TYPE from inferior memory. The header is found |
352 | by scanning the OS auxillary vector. | |
353 | ||
09919ac2 JK |
354 | If TYPE == -1, return the program headers instead of the contents of |
355 | one program header. | |
356 | ||
97ec2c2f UW |
357 | Return a pointer to allocated memory holding the program header contents, |
358 | or NULL on failure. If sucessful, and unless P_SECT_SIZE is NULL, the | |
359 | size of those contents is returned to P_SECT_SIZE. Likewise, the target | |
360 | architecture size (32-bit or 64-bit) is returned to P_ARCH_SIZE. */ | |
361 | ||
362 | static gdb_byte * | |
363 | read_program_header (int type, int *p_sect_size, int *p_arch_size) | |
364 | { | |
f5656ead | 365 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
43136979 | 366 | CORE_ADDR at_phdr, at_phent, at_phnum, pt_phdr = 0; |
97ec2c2f UW |
367 | int arch_size, sect_size; |
368 | CORE_ADDR sect_addr; | |
369 | gdb_byte *buf; | |
43136979 | 370 | int pt_phdr_p = 0; |
97ec2c2f UW |
371 | |
372 | /* Get required auxv elements from target. */ | |
373 | if (target_auxv_search (¤t_target, AT_PHDR, &at_phdr) <= 0) | |
374 | return 0; | |
375 | if (target_auxv_search (¤t_target, AT_PHENT, &at_phent) <= 0) | |
376 | return 0; | |
377 | if (target_auxv_search (¤t_target, AT_PHNUM, &at_phnum) <= 0) | |
378 | return 0; | |
379 | if (!at_phdr || !at_phnum) | |
380 | return 0; | |
381 | ||
382 | /* Determine ELF architecture type. */ | |
383 | if (at_phent == sizeof (Elf32_External_Phdr)) | |
384 | arch_size = 32; | |
385 | else if (at_phent == sizeof (Elf64_External_Phdr)) | |
386 | arch_size = 64; | |
387 | else | |
388 | return 0; | |
389 | ||
09919ac2 JK |
390 | /* Find the requested segment. */ |
391 | if (type == -1) | |
392 | { | |
393 | sect_addr = at_phdr; | |
394 | sect_size = at_phent * at_phnum; | |
395 | } | |
396 | else if (arch_size == 32) | |
97ec2c2f UW |
397 | { |
398 | Elf32_External_Phdr phdr; | |
399 | int i; | |
400 | ||
401 | /* Search for requested PHDR. */ | |
402 | for (i = 0; i < at_phnum; i++) | |
403 | { | |
43136979 AR |
404 | int p_type; |
405 | ||
97ec2c2f UW |
406 | if (target_read_memory (at_phdr + i * sizeof (phdr), |
407 | (gdb_byte *)&phdr, sizeof (phdr))) | |
408 | return 0; | |
409 | ||
43136979 AR |
410 | p_type = extract_unsigned_integer ((gdb_byte *) phdr.p_type, |
411 | 4, byte_order); | |
412 | ||
413 | if (p_type == PT_PHDR) | |
414 | { | |
415 | pt_phdr_p = 1; | |
416 | pt_phdr = extract_unsigned_integer ((gdb_byte *) phdr.p_vaddr, | |
417 | 4, byte_order); | |
418 | } | |
419 | ||
420 | if (p_type == type) | |
97ec2c2f UW |
421 | break; |
422 | } | |
423 | ||
424 | if (i == at_phnum) | |
425 | return 0; | |
426 | ||
427 | /* Retrieve address and size. */ | |
e17a4113 UW |
428 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
429 | 4, byte_order); | |
430 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
431 | 4, byte_order); | |
97ec2c2f UW |
432 | } |
433 | else | |
434 | { | |
435 | Elf64_External_Phdr phdr; | |
436 | int i; | |
437 | ||
438 | /* Search for requested PHDR. */ | |
439 | for (i = 0; i < at_phnum; i++) | |
440 | { | |
43136979 AR |
441 | int p_type; |
442 | ||
97ec2c2f UW |
443 | if (target_read_memory (at_phdr + i * sizeof (phdr), |
444 | (gdb_byte *)&phdr, sizeof (phdr))) | |
445 | return 0; | |
446 | ||
43136979 AR |
447 | p_type = extract_unsigned_integer ((gdb_byte *) phdr.p_type, |
448 | 4, byte_order); | |
449 | ||
450 | if (p_type == PT_PHDR) | |
451 | { | |
452 | pt_phdr_p = 1; | |
453 | pt_phdr = extract_unsigned_integer ((gdb_byte *) phdr.p_vaddr, | |
454 | 8, byte_order); | |
455 | } | |
456 | ||
457 | if (p_type == type) | |
97ec2c2f UW |
458 | break; |
459 | } | |
460 | ||
461 | if (i == at_phnum) | |
462 | return 0; | |
463 | ||
464 | /* Retrieve address and size. */ | |
e17a4113 UW |
465 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
466 | 8, byte_order); | |
467 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
468 | 8, byte_order); | |
97ec2c2f UW |
469 | } |
470 | ||
43136979 AR |
471 | /* PT_PHDR is optional, but we really need it |
472 | for PIE to make this work in general. */ | |
473 | ||
474 | if (pt_phdr_p) | |
475 | { | |
476 | /* at_phdr is real address in memory. pt_phdr is what pheader says it is. | |
477 | Relocation offset is the difference between the two. */ | |
478 | sect_addr = sect_addr + (at_phdr - pt_phdr); | |
479 | } | |
480 | ||
97ec2c2f UW |
481 | /* Read in requested program header. */ |
482 | buf = xmalloc (sect_size); | |
483 | if (target_read_memory (sect_addr, buf, sect_size)) | |
484 | { | |
485 | xfree (buf); | |
486 | return NULL; | |
487 | } | |
488 | ||
489 | if (p_arch_size) | |
490 | *p_arch_size = arch_size; | |
491 | if (p_sect_size) | |
492 | *p_sect_size = sect_size; | |
493 | ||
494 | return buf; | |
495 | } | |
496 | ||
497 | ||
498 | /* Return program interpreter string. */ | |
499 | static gdb_byte * | |
500 | find_program_interpreter (void) | |
501 | { | |
502 | gdb_byte *buf = NULL; | |
503 | ||
504 | /* If we have an exec_bfd, use its section table. */ | |
505 | if (exec_bfd | |
506 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
507 | { | |
508 | struct bfd_section *interp_sect; | |
509 | ||
510 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
511 | if (interp_sect != NULL) | |
512 | { | |
97ec2c2f UW |
513 | int sect_size = bfd_section_size (exec_bfd, interp_sect); |
514 | ||
515 | buf = xmalloc (sect_size); | |
516 | bfd_get_section_contents (exec_bfd, interp_sect, buf, 0, sect_size); | |
517 | } | |
518 | } | |
519 | ||
520 | /* If we didn't find it, use the target auxillary vector. */ | |
521 | if (!buf) | |
522 | buf = read_program_header (PT_INTERP, NULL, NULL); | |
523 | ||
524 | return buf; | |
525 | } | |
526 | ||
527 | ||
c378eb4e | 528 | /* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is |
3a40aaa0 UW |
529 | returned and the corresponding PTR is set. */ |
530 | ||
531 | static int | |
532 | scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr) | |
533 | { | |
534 | int arch_size, step, sect_size; | |
535 | long dyn_tag; | |
b381ea14 | 536 | CORE_ADDR dyn_ptr, dyn_addr; |
65728c26 | 537 | gdb_byte *bufend, *bufstart, *buf; |
3a40aaa0 UW |
538 | Elf32_External_Dyn *x_dynp_32; |
539 | Elf64_External_Dyn *x_dynp_64; | |
540 | struct bfd_section *sect; | |
61f0d762 | 541 | struct target_section *target_section; |
3a40aaa0 UW |
542 | |
543 | if (abfd == NULL) | |
544 | return 0; | |
0763ab81 PA |
545 | |
546 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
547 | return 0; | |
548 | ||
3a40aaa0 UW |
549 | arch_size = bfd_get_arch_size (abfd); |
550 | if (arch_size == -1) | |
0763ab81 | 551 | return 0; |
3a40aaa0 UW |
552 | |
553 | /* Find the start address of the .dynamic section. */ | |
554 | sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
555 | if (sect == NULL) | |
556 | return 0; | |
61f0d762 JK |
557 | |
558 | for (target_section = current_target_sections->sections; | |
559 | target_section < current_target_sections->sections_end; | |
560 | target_section++) | |
561 | if (sect == target_section->the_bfd_section) | |
562 | break; | |
b381ea14 JK |
563 | if (target_section < current_target_sections->sections_end) |
564 | dyn_addr = target_section->addr; | |
565 | else | |
566 | { | |
567 | /* ABFD may come from OBJFILE acting only as a symbol file without being | |
568 | loaded into the target (see add_symbol_file_command). This case is | |
569 | such fallback to the file VMA address without the possibility of | |
570 | having the section relocated to its actual in-memory address. */ | |
571 | ||
572 | dyn_addr = bfd_section_vma (abfd, sect); | |
573 | } | |
3a40aaa0 | 574 | |
65728c26 DJ |
575 | /* Read in .dynamic from the BFD. We will get the actual value |
576 | from memory later. */ | |
3a40aaa0 | 577 | sect_size = bfd_section_size (abfd, sect); |
65728c26 DJ |
578 | buf = bufstart = alloca (sect_size); |
579 | if (!bfd_get_section_contents (abfd, sect, | |
580 | buf, 0, sect_size)) | |
581 | return 0; | |
3a40aaa0 UW |
582 | |
583 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
584 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
585 | : sizeof (Elf64_External_Dyn); | |
586 | for (bufend = buf + sect_size; | |
587 | buf < bufend; | |
588 | buf += step) | |
589 | { | |
590 | if (arch_size == 32) | |
591 | { | |
592 | x_dynp_32 = (Elf32_External_Dyn *) buf; | |
593 | dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag); | |
594 | dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr); | |
595 | } | |
65728c26 | 596 | else |
3a40aaa0 UW |
597 | { |
598 | x_dynp_64 = (Elf64_External_Dyn *) buf; | |
599 | dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag); | |
600 | dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr); | |
601 | } | |
602 | if (dyn_tag == DT_NULL) | |
603 | return 0; | |
604 | if (dyn_tag == dyntag) | |
605 | { | |
65728c26 DJ |
606 | /* If requested, try to read the runtime value of this .dynamic |
607 | entry. */ | |
3a40aaa0 | 608 | if (ptr) |
65728c26 | 609 | { |
b6da22b0 | 610 | struct type *ptr_type; |
65728c26 DJ |
611 | gdb_byte ptr_buf[8]; |
612 | CORE_ADDR ptr_addr; | |
613 | ||
f5656ead | 614 | ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
b381ea14 | 615 | ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8; |
65728c26 | 616 | if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0) |
b6da22b0 | 617 | dyn_ptr = extract_typed_address (ptr_buf, ptr_type); |
65728c26 DJ |
618 | *ptr = dyn_ptr; |
619 | } | |
620 | return 1; | |
3a40aaa0 UW |
621 | } |
622 | } | |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
97ec2c2f UW |
627 | /* Scan for DYNTAG in .dynamic section of the target's main executable, |
628 | found by consulting the OS auxillary vector. If DYNTAG is found 1 is | |
629 | returned and the corresponding PTR is set. */ | |
630 | ||
631 | static int | |
632 | scan_dyntag_auxv (int dyntag, CORE_ADDR *ptr) | |
633 | { | |
f5656ead | 634 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
97ec2c2f UW |
635 | int sect_size, arch_size, step; |
636 | long dyn_tag; | |
637 | CORE_ADDR dyn_ptr; | |
638 | gdb_byte *bufend, *bufstart, *buf; | |
639 | ||
640 | /* Read in .dynamic section. */ | |
641 | buf = bufstart = read_program_header (PT_DYNAMIC, §_size, &arch_size); | |
642 | if (!buf) | |
643 | return 0; | |
644 | ||
645 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
646 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
647 | : sizeof (Elf64_External_Dyn); | |
648 | for (bufend = buf + sect_size; | |
649 | buf < bufend; | |
650 | buf += step) | |
651 | { | |
652 | if (arch_size == 32) | |
653 | { | |
654 | Elf32_External_Dyn *dynp = (Elf32_External_Dyn *) buf; | |
433759f7 | 655 | |
e17a4113 UW |
656 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
657 | 4, byte_order); | |
658 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
659 | 4, byte_order); | |
97ec2c2f UW |
660 | } |
661 | else | |
662 | { | |
663 | Elf64_External_Dyn *dynp = (Elf64_External_Dyn *) buf; | |
433759f7 | 664 | |
e17a4113 UW |
665 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
666 | 8, byte_order); | |
667 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
668 | 8, byte_order); | |
97ec2c2f UW |
669 | } |
670 | if (dyn_tag == DT_NULL) | |
671 | break; | |
672 | ||
673 | if (dyn_tag == dyntag) | |
674 | { | |
675 | if (ptr) | |
676 | *ptr = dyn_ptr; | |
677 | ||
678 | xfree (bufstart); | |
679 | return 1; | |
680 | } | |
681 | } | |
682 | ||
683 | xfree (bufstart); | |
684 | return 0; | |
685 | } | |
686 | ||
7f86f058 PA |
687 | /* Locate the base address of dynamic linker structs for SVR4 elf |
688 | targets. | |
13437d4b KB |
689 | |
690 | For SVR4 elf targets the address of the dynamic linker's runtime | |
691 | structure is contained within the dynamic info section in the | |
692 | executable file. The dynamic section is also mapped into the | |
693 | inferior address space. Because the runtime loader fills in the | |
694 | real address before starting the inferior, we have to read in the | |
695 | dynamic info section from the inferior address space. | |
696 | If there are any errors while trying to find the address, we | |
7f86f058 | 697 | silently return 0, otherwise the found address is returned. */ |
13437d4b KB |
698 | |
699 | static CORE_ADDR | |
700 | elf_locate_base (void) | |
701 | { | |
3a40aaa0 UW |
702 | struct minimal_symbol *msymbol; |
703 | CORE_ADDR dyn_ptr; | |
13437d4b | 704 | |
65728c26 DJ |
705 | /* Look for DT_MIPS_RLD_MAP first. MIPS executables use this |
706 | instead of DT_DEBUG, although they sometimes contain an unused | |
707 | DT_DEBUG. */ | |
97ec2c2f UW |
708 | if (scan_dyntag (DT_MIPS_RLD_MAP, exec_bfd, &dyn_ptr) |
709 | || scan_dyntag_auxv (DT_MIPS_RLD_MAP, &dyn_ptr)) | |
3a40aaa0 | 710 | { |
f5656ead | 711 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
3a40aaa0 | 712 | gdb_byte *pbuf; |
b6da22b0 | 713 | int pbuf_size = TYPE_LENGTH (ptr_type); |
433759f7 | 714 | |
3a40aaa0 UW |
715 | pbuf = alloca (pbuf_size); |
716 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
717 | of the dynamic link structure. */ | |
718 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) | |
e499d0f1 | 719 | return 0; |
b6da22b0 | 720 | return extract_typed_address (pbuf, ptr_type); |
e499d0f1 DJ |
721 | } |
722 | ||
65728c26 | 723 | /* Find DT_DEBUG. */ |
97ec2c2f UW |
724 | if (scan_dyntag (DT_DEBUG, exec_bfd, &dyn_ptr) |
725 | || scan_dyntag_auxv (DT_DEBUG, &dyn_ptr)) | |
65728c26 DJ |
726 | return dyn_ptr; |
727 | ||
3a40aaa0 UW |
728 | /* This may be a static executable. Look for the symbol |
729 | conventionally named _r_debug, as a last resort. */ | |
730 | msymbol = lookup_minimal_symbol ("_r_debug", NULL, symfile_objfile); | |
731 | if (msymbol != NULL) | |
732 | return SYMBOL_VALUE_ADDRESS (msymbol); | |
13437d4b KB |
733 | |
734 | /* DT_DEBUG entry not found. */ | |
735 | return 0; | |
736 | } | |
737 | ||
7f86f058 | 738 | /* Locate the base address of dynamic linker structs. |
13437d4b KB |
739 | |
740 | For both the SunOS and SVR4 shared library implementations, if the | |
741 | inferior executable has been linked dynamically, there is a single | |
742 | address somewhere in the inferior's data space which is the key to | |
743 | locating all of the dynamic linker's runtime structures. This | |
744 | address is the value of the debug base symbol. The job of this | |
745 | function is to find and return that address, or to return 0 if there | |
746 | is no such address (the executable is statically linked for example). | |
747 | ||
748 | For SunOS, the job is almost trivial, since the dynamic linker and | |
749 | all of it's structures are statically linked to the executable at | |
750 | link time. Thus the symbol for the address we are looking for has | |
751 | already been added to the minimal symbol table for the executable's | |
752 | objfile at the time the symbol file's symbols were read, and all we | |
753 | have to do is look it up there. Note that we explicitly do NOT want | |
754 | to find the copies in the shared library. | |
755 | ||
756 | The SVR4 version is a bit more complicated because the address | |
757 | is contained somewhere in the dynamic info section. We have to go | |
758 | to a lot more work to discover the address of the debug base symbol. | |
759 | Because of this complexity, we cache the value we find and return that | |
760 | value on subsequent invocations. Note there is no copy in the | |
7f86f058 | 761 | executable symbol tables. */ |
13437d4b KB |
762 | |
763 | static CORE_ADDR | |
1a816a87 | 764 | locate_base (struct svr4_info *info) |
13437d4b | 765 | { |
13437d4b KB |
766 | /* Check to see if we have a currently valid address, and if so, avoid |
767 | doing all this work again and just return the cached address. If | |
768 | we have no cached address, try to locate it in the dynamic info | |
d5a921c9 KB |
769 | section for ELF executables. There's no point in doing any of this |
770 | though if we don't have some link map offsets to work with. */ | |
13437d4b | 771 | |
1a816a87 | 772 | if (info->debug_base == 0 && svr4_have_link_map_offsets ()) |
0763ab81 | 773 | info->debug_base = elf_locate_base (); |
1a816a87 | 774 | return info->debug_base; |
13437d4b KB |
775 | } |
776 | ||
e4cd0d6a | 777 | /* Find the first element in the inferior's dynamic link map, and |
6f992fbf JB |
778 | return its address in the inferior. Return zero if the address |
779 | could not be determined. | |
13437d4b | 780 | |
e4cd0d6a MK |
781 | FIXME: Perhaps we should validate the info somehow, perhaps by |
782 | checking r_version for a known version number, or r_state for | |
783 | RT_CONSISTENT. */ | |
13437d4b KB |
784 | |
785 | static CORE_ADDR | |
1a816a87 | 786 | solib_svr4_r_map (struct svr4_info *info) |
13437d4b | 787 | { |
4b188b9f | 788 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f5656ead | 789 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
08597104 JB |
790 | CORE_ADDR addr = 0; |
791 | volatile struct gdb_exception ex; | |
13437d4b | 792 | |
08597104 JB |
793 | TRY_CATCH (ex, RETURN_MASK_ERROR) |
794 | { | |
795 | addr = read_memory_typed_address (info->debug_base + lmo->r_map_offset, | |
796 | ptr_type); | |
797 | } | |
798 | exception_print (gdb_stderr, ex); | |
799 | return addr; | |
e4cd0d6a | 800 | } |
13437d4b | 801 | |
7cd25cfc DJ |
802 | /* Find r_brk from the inferior's debug base. */ |
803 | ||
804 | static CORE_ADDR | |
1a816a87 | 805 | solib_svr4_r_brk (struct svr4_info *info) |
7cd25cfc DJ |
806 | { |
807 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
f5656ead | 808 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
7cd25cfc | 809 | |
1a816a87 PA |
810 | return read_memory_typed_address (info->debug_base + lmo->r_brk_offset, |
811 | ptr_type); | |
7cd25cfc DJ |
812 | } |
813 | ||
e4cd0d6a MK |
814 | /* Find the link map for the dynamic linker (if it is not in the |
815 | normal list of loaded shared objects). */ | |
13437d4b | 816 | |
e4cd0d6a | 817 | static CORE_ADDR |
1a816a87 | 818 | solib_svr4_r_ldsomap (struct svr4_info *info) |
e4cd0d6a MK |
819 | { |
820 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
f5656ead TT |
821 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
822 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); | |
e4cd0d6a | 823 | ULONGEST version; |
13437d4b | 824 | |
e4cd0d6a MK |
825 | /* Check version, and return zero if `struct r_debug' doesn't have |
826 | the r_ldsomap member. */ | |
1a816a87 PA |
827 | version |
828 | = read_memory_unsigned_integer (info->debug_base + lmo->r_version_offset, | |
e17a4113 | 829 | lmo->r_version_size, byte_order); |
e4cd0d6a MK |
830 | if (version < 2 || lmo->r_ldsomap_offset == -1) |
831 | return 0; | |
13437d4b | 832 | |
1a816a87 | 833 | return read_memory_typed_address (info->debug_base + lmo->r_ldsomap_offset, |
b6da22b0 | 834 | ptr_type); |
13437d4b KB |
835 | } |
836 | ||
de18c1d8 JM |
837 | /* On Solaris systems with some versions of the dynamic linker, |
838 | ld.so's l_name pointer points to the SONAME in the string table | |
839 | rather than into writable memory. So that GDB can find shared | |
840 | libraries when loading a core file generated by gcore, ensure that | |
841 | memory areas containing the l_name string are saved in the core | |
842 | file. */ | |
843 | ||
844 | static int | |
845 | svr4_keep_data_in_core (CORE_ADDR vaddr, unsigned long size) | |
846 | { | |
847 | struct svr4_info *info; | |
848 | CORE_ADDR ldsomap; | |
849 | struct so_list *new; | |
850 | struct cleanup *old_chain; | |
74de0234 | 851 | CORE_ADDR name_lm; |
de18c1d8 JM |
852 | |
853 | info = get_svr4_info (); | |
854 | ||
855 | info->debug_base = 0; | |
856 | locate_base (info); | |
857 | if (!info->debug_base) | |
858 | return 0; | |
859 | ||
860 | ldsomap = solib_svr4_r_ldsomap (info); | |
861 | if (!ldsomap) | |
862 | return 0; | |
863 | ||
de18c1d8 JM |
864 | new = XZALLOC (struct so_list); |
865 | old_chain = make_cleanup (xfree, new); | |
3957565a | 866 | new->lm_info = lm_info_read (ldsomap); |
de18c1d8 | 867 | make_cleanup (xfree, new->lm_info); |
3957565a | 868 | name_lm = new->lm_info ? new->lm_info->l_name : 0; |
de18c1d8 JM |
869 | do_cleanups (old_chain); |
870 | ||
74de0234 | 871 | return (name_lm >= vaddr && name_lm < vaddr + size); |
de18c1d8 JM |
872 | } |
873 | ||
7f86f058 | 874 | /* Implement the "open_symbol_file_object" target_so_ops method. |
13437d4b | 875 | |
7f86f058 PA |
876 | If no open symbol file, attempt to locate and open the main symbol |
877 | file. On SVR4 systems, this is the first link map entry. If its | |
878 | name is here, we can open it. Useful when attaching to a process | |
879 | without first loading its symbol file. */ | |
13437d4b KB |
880 | |
881 | static int | |
882 | open_symbol_file_object (void *from_ttyp) | |
883 | { | |
884 | CORE_ADDR lm, l_name; | |
885 | char *filename; | |
886 | int errcode; | |
887 | int from_tty = *(int *)from_ttyp; | |
4b188b9f | 888 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f5656ead | 889 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
b6da22b0 | 890 | int l_name_size = TYPE_LENGTH (ptr_type); |
cfaefc65 | 891 | gdb_byte *l_name_buf = xmalloc (l_name_size); |
b8c9b27d | 892 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); |
6c95b8df | 893 | struct svr4_info *info = get_svr4_info (); |
13437d4b KB |
894 | |
895 | if (symfile_objfile) | |
9e2f0ad4 | 896 | if (!query (_("Attempt to reload symbols from process? "))) |
3bb47e8b TT |
897 | { |
898 | do_cleanups (cleanups); | |
899 | return 0; | |
900 | } | |
13437d4b | 901 | |
7cd25cfc | 902 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
903 | info->debug_base = 0; |
904 | if (locate_base (info) == 0) | |
3bb47e8b TT |
905 | { |
906 | do_cleanups (cleanups); | |
907 | return 0; /* failed somehow... */ | |
908 | } | |
13437d4b KB |
909 | |
910 | /* First link map member should be the executable. */ | |
1a816a87 | 911 | lm = solib_svr4_r_map (info); |
e4cd0d6a | 912 | if (lm == 0) |
3bb47e8b TT |
913 | { |
914 | do_cleanups (cleanups); | |
915 | return 0; /* failed somehow... */ | |
916 | } | |
13437d4b KB |
917 | |
918 | /* Read address of name from target memory to GDB. */ | |
cfaefc65 | 919 | read_memory (lm + lmo->l_name_offset, l_name_buf, l_name_size); |
13437d4b | 920 | |
cfaefc65 | 921 | /* Convert the address to host format. */ |
b6da22b0 | 922 | l_name = extract_typed_address (l_name_buf, ptr_type); |
13437d4b | 923 | |
13437d4b | 924 | if (l_name == 0) |
3bb47e8b TT |
925 | { |
926 | do_cleanups (cleanups); | |
927 | return 0; /* No filename. */ | |
928 | } | |
13437d4b KB |
929 | |
930 | /* Now fetch the filename from target memory. */ | |
931 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
ea5bf0a1 | 932 | make_cleanup (xfree, filename); |
13437d4b KB |
933 | |
934 | if (errcode) | |
935 | { | |
8a3fe4f8 | 936 | warning (_("failed to read exec filename from attached file: %s"), |
13437d4b | 937 | safe_strerror (errcode)); |
3bb47e8b | 938 | do_cleanups (cleanups); |
13437d4b KB |
939 | return 0; |
940 | } | |
941 | ||
13437d4b | 942 | /* Have a pathname: read the symbol file. */ |
1adeb98a | 943 | symbol_file_add_main (filename, from_tty); |
13437d4b | 944 | |
3bb47e8b | 945 | do_cleanups (cleanups); |
13437d4b KB |
946 | return 1; |
947 | } | |
13437d4b | 948 | |
2268b414 JK |
949 | /* Data exchange structure for the XML parser as returned by |
950 | svr4_current_sos_via_xfer_libraries. */ | |
951 | ||
952 | struct svr4_library_list | |
953 | { | |
954 | struct so_list *head, **tailp; | |
955 | ||
956 | /* Inferior address of struct link_map used for the main executable. It is | |
957 | NULL if not known. */ | |
958 | CORE_ADDR main_lm; | |
959 | }; | |
960 | ||
93f2a35e JK |
961 | /* Implementation for target_so_ops.free_so. */ |
962 | ||
963 | static void | |
964 | svr4_free_so (struct so_list *so) | |
965 | { | |
966 | xfree (so->lm_info); | |
967 | } | |
968 | ||
969 | /* Free so_list built so far (called via cleanup). */ | |
970 | ||
971 | static void | |
972 | svr4_free_library_list (void *p_list) | |
973 | { | |
974 | struct so_list *list = *(struct so_list **) p_list; | |
975 | ||
976 | while (list != NULL) | |
977 | { | |
978 | struct so_list *next = list->next; | |
979 | ||
3756ef7e | 980 | free_so (list); |
93f2a35e JK |
981 | list = next; |
982 | } | |
983 | } | |
984 | ||
2268b414 JK |
985 | #ifdef HAVE_LIBEXPAT |
986 | ||
987 | #include "xml-support.h" | |
988 | ||
989 | /* Handle the start of a <library> element. Note: new elements are added | |
990 | at the tail of the list, keeping the list in order. */ | |
991 | ||
992 | static void | |
993 | library_list_start_library (struct gdb_xml_parser *parser, | |
994 | const struct gdb_xml_element *element, | |
995 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
996 | { | |
997 | struct svr4_library_list *list = user_data; | |
998 | const char *name = xml_find_attribute (attributes, "name")->value; | |
999 | ULONGEST *lmp = xml_find_attribute (attributes, "lm")->value; | |
1000 | ULONGEST *l_addrp = xml_find_attribute (attributes, "l_addr")->value; | |
1001 | ULONGEST *l_ldp = xml_find_attribute (attributes, "l_ld")->value; | |
1002 | struct so_list *new_elem; | |
1003 | ||
1004 | new_elem = XZALLOC (struct so_list); | |
1005 | new_elem->lm_info = XZALLOC (struct lm_info); | |
1006 | new_elem->lm_info->lm_addr = *lmp; | |
1007 | new_elem->lm_info->l_addr_inferior = *l_addrp; | |
1008 | new_elem->lm_info->l_ld = *l_ldp; | |
1009 | ||
1010 | strncpy (new_elem->so_name, name, sizeof (new_elem->so_name) - 1); | |
1011 | new_elem->so_name[sizeof (new_elem->so_name) - 1] = 0; | |
1012 | strcpy (new_elem->so_original_name, new_elem->so_name); | |
1013 | ||
1014 | *list->tailp = new_elem; | |
1015 | list->tailp = &new_elem->next; | |
1016 | } | |
1017 | ||
1018 | /* Handle the start of a <library-list-svr4> element. */ | |
1019 | ||
1020 | static void | |
1021 | svr4_library_list_start_list (struct gdb_xml_parser *parser, | |
1022 | const struct gdb_xml_element *element, | |
1023 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
1024 | { | |
1025 | struct svr4_library_list *list = user_data; | |
1026 | const char *version = xml_find_attribute (attributes, "version")->value; | |
1027 | struct gdb_xml_value *main_lm = xml_find_attribute (attributes, "main-lm"); | |
1028 | ||
1029 | if (strcmp (version, "1.0") != 0) | |
1030 | gdb_xml_error (parser, | |
1031 | _("SVR4 Library list has unsupported version \"%s\""), | |
1032 | version); | |
1033 | ||
1034 | if (main_lm) | |
1035 | list->main_lm = *(ULONGEST *) main_lm->value; | |
1036 | } | |
1037 | ||
1038 | /* The allowed elements and attributes for an XML library list. | |
1039 | The root element is a <library-list>. */ | |
1040 | ||
1041 | static const struct gdb_xml_attribute svr4_library_attributes[] = | |
1042 | { | |
1043 | { "name", GDB_XML_AF_NONE, NULL, NULL }, | |
1044 | { "lm", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
1045 | { "l_addr", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
1046 | { "l_ld", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
1047 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
1048 | }; | |
1049 | ||
1050 | static const struct gdb_xml_element svr4_library_list_children[] = | |
1051 | { | |
1052 | { | |
1053 | "library", svr4_library_attributes, NULL, | |
1054 | GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, | |
1055 | library_list_start_library, NULL | |
1056 | }, | |
1057 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
1058 | }; | |
1059 | ||
1060 | static const struct gdb_xml_attribute svr4_library_list_attributes[] = | |
1061 | { | |
1062 | { "version", GDB_XML_AF_NONE, NULL, NULL }, | |
1063 | { "main-lm", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL }, | |
1064 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
1065 | }; | |
1066 | ||
1067 | static const struct gdb_xml_element svr4_library_list_elements[] = | |
1068 | { | |
1069 | { "library-list-svr4", svr4_library_list_attributes, svr4_library_list_children, | |
1070 | GDB_XML_EF_NONE, svr4_library_list_start_list, NULL }, | |
1071 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
1072 | }; | |
1073 | ||
2268b414 JK |
1074 | /* Parse qXfer:libraries:read packet into *SO_LIST_RETURN. Return 1 if |
1075 | ||
1076 | Return 0 if packet not supported, *SO_LIST_RETURN is not modified in such | |
1077 | case. Return 1 if *SO_LIST_RETURN contains the library list, it may be | |
1078 | empty, caller is responsible for freeing all its entries. */ | |
1079 | ||
1080 | static int | |
1081 | svr4_parse_libraries (const char *document, struct svr4_library_list *list) | |
1082 | { | |
1083 | struct cleanup *back_to = make_cleanup (svr4_free_library_list, | |
1084 | &list->head); | |
1085 | ||
1086 | memset (list, 0, sizeof (*list)); | |
1087 | list->tailp = &list->head; | |
1088 | if (gdb_xml_parse_quick (_("target library list"), "library-list.dtd", | |
1089 | svr4_library_list_elements, document, list) == 0) | |
1090 | { | |
1091 | /* Parsed successfully, keep the result. */ | |
1092 | discard_cleanups (back_to); | |
1093 | return 1; | |
1094 | } | |
1095 | ||
1096 | do_cleanups (back_to); | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | /* Attempt to get so_list from target via qXfer:libraries:read packet. | |
1101 | ||
1102 | Return 0 if packet not supported, *SO_LIST_RETURN is not modified in such | |
1103 | case. Return 1 if *SO_LIST_RETURN contains the library list, it may be | |
1104 | empty, caller is responsible for freeing all its entries. */ | |
1105 | ||
1106 | static int | |
1107 | svr4_current_sos_via_xfer_libraries (struct svr4_library_list *list) | |
1108 | { | |
1109 | char *svr4_library_document; | |
1110 | int result; | |
1111 | struct cleanup *back_to; | |
1112 | ||
1113 | /* Fetch the list of shared libraries. */ | |
1114 | svr4_library_document = target_read_stralloc (¤t_target, | |
1115 | TARGET_OBJECT_LIBRARIES_SVR4, | |
1116 | NULL); | |
1117 | if (svr4_library_document == NULL) | |
1118 | return 0; | |
1119 | ||
1120 | back_to = make_cleanup (xfree, svr4_library_document); | |
1121 | result = svr4_parse_libraries (svr4_library_document, list); | |
1122 | do_cleanups (back_to); | |
1123 | ||
1124 | return result; | |
1125 | } | |
1126 | ||
1127 | #else | |
1128 | ||
1129 | static int | |
1130 | svr4_current_sos_via_xfer_libraries (struct svr4_library_list *list) | |
1131 | { | |
1132 | return 0; | |
1133 | } | |
1134 | ||
1135 | #endif | |
1136 | ||
34439770 DJ |
1137 | /* If no shared library information is available from the dynamic |
1138 | linker, build a fallback list from other sources. */ | |
1139 | ||
1140 | static struct so_list * | |
1141 | svr4_default_sos (void) | |
1142 | { | |
6c95b8df | 1143 | struct svr4_info *info = get_svr4_info (); |
8e5c319d | 1144 | struct so_list *new; |
1a816a87 | 1145 | |
8e5c319d JK |
1146 | if (!info->debug_loader_offset_p) |
1147 | return NULL; | |
34439770 | 1148 | |
8e5c319d | 1149 | new = XZALLOC (struct so_list); |
34439770 | 1150 | |
3957565a | 1151 | new->lm_info = xzalloc (sizeof (struct lm_info)); |
34439770 | 1152 | |
3957565a | 1153 | /* Nothing will ever check the other fields if we set l_addr_p. */ |
8e5c319d | 1154 | new->lm_info->l_addr = info->debug_loader_offset; |
3957565a | 1155 | new->lm_info->l_addr_p = 1; |
34439770 | 1156 | |
8e5c319d JK |
1157 | strncpy (new->so_name, info->debug_loader_name, SO_NAME_MAX_PATH_SIZE - 1); |
1158 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
1159 | strcpy (new->so_original_name, new->so_name); | |
34439770 | 1160 | |
8e5c319d | 1161 | return new; |
34439770 DJ |
1162 | } |
1163 | ||
cb08cc53 JK |
1164 | /* Read the whole inferior libraries chain starting at address LM. Add the |
1165 | entries to the tail referenced by LINK_PTR_PTR. Ignore the first entry if | |
1166 | IGNORE_FIRST and set global MAIN_LM_ADDR according to it. */ | |
13437d4b | 1167 | |
cb08cc53 JK |
1168 | static void |
1169 | svr4_read_so_list (CORE_ADDR lm, struct so_list ***link_ptr_ptr, | |
1170 | int ignore_first) | |
13437d4b | 1171 | { |
cb08cc53 | 1172 | CORE_ADDR prev_lm = 0, next_lm; |
13437d4b | 1173 | |
cb08cc53 | 1174 | for (; lm != 0; prev_lm = lm, lm = next_lm) |
13437d4b | 1175 | { |
cb08cc53 JK |
1176 | struct so_list *new; |
1177 | struct cleanup *old_chain; | |
1178 | int errcode; | |
1179 | char *buffer; | |
13437d4b | 1180 | |
cb08cc53 JK |
1181 | new = XZALLOC (struct so_list); |
1182 | old_chain = make_cleanup_free_so (new); | |
13437d4b | 1183 | |
3957565a JK |
1184 | new->lm_info = lm_info_read (lm); |
1185 | if (new->lm_info == NULL) | |
1186 | { | |
1187 | do_cleanups (old_chain); | |
1188 | break; | |
1189 | } | |
13437d4b | 1190 | |
3957565a | 1191 | next_lm = new->lm_info->l_next; |
492928e4 | 1192 | |
3957565a | 1193 | if (new->lm_info->l_prev != prev_lm) |
492928e4 | 1194 | { |
2268b414 | 1195 | warning (_("Corrupted shared library list: %s != %s"), |
f5656ead TT |
1196 | paddress (target_gdbarch (), prev_lm), |
1197 | paddress (target_gdbarch (), new->lm_info->l_prev)); | |
cb08cc53 JK |
1198 | do_cleanups (old_chain); |
1199 | break; | |
492928e4 | 1200 | } |
13437d4b KB |
1201 | |
1202 | /* For SVR4 versions, the first entry in the link map is for the | |
1203 | inferior executable, so we must ignore it. For some versions of | |
1204 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1205 | does have a name, so we can no longer use a missing name to | |
c378eb4e | 1206 | decide when to ignore it. */ |
3957565a | 1207 | if (ignore_first && new->lm_info->l_prev == 0) |
93a57060 | 1208 | { |
cb08cc53 JK |
1209 | struct svr4_info *info = get_svr4_info (); |
1210 | ||
1a816a87 | 1211 | info->main_lm_addr = new->lm_info->lm_addr; |
cb08cc53 JK |
1212 | do_cleanups (old_chain); |
1213 | continue; | |
93a57060 | 1214 | } |
13437d4b | 1215 | |
cb08cc53 | 1216 | /* Extract this shared object's name. */ |
3957565a | 1217 | target_read_string (new->lm_info->l_name, &buffer, |
cb08cc53 JK |
1218 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); |
1219 | if (errcode != 0) | |
1220 | { | |
1221 | warning (_("Can't read pathname for load map: %s."), | |
1222 | safe_strerror (errcode)); | |
1223 | do_cleanups (old_chain); | |
1224 | continue; | |
13437d4b KB |
1225 | } |
1226 | ||
cb08cc53 JK |
1227 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); |
1228 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
1229 | strcpy (new->so_original_name, new->so_name); | |
1230 | xfree (buffer); | |
492928e4 | 1231 | |
cb08cc53 JK |
1232 | /* If this entry has no name, or its name matches the name |
1233 | for the main executable, don't include it in the list. */ | |
1234 | if (! new->so_name[0] || match_main (new->so_name)) | |
492928e4 | 1235 | { |
cb08cc53 JK |
1236 | do_cleanups (old_chain); |
1237 | continue; | |
492928e4 | 1238 | } |
e4cd0d6a | 1239 | |
13437d4b | 1240 | discard_cleanups (old_chain); |
cb08cc53 JK |
1241 | new->next = 0; |
1242 | **link_ptr_ptr = new; | |
1243 | *link_ptr_ptr = &new->next; | |
13437d4b | 1244 | } |
cb08cc53 JK |
1245 | } |
1246 | ||
1247 | /* Implement the "current_sos" target_so_ops method. */ | |
1248 | ||
1249 | static struct so_list * | |
1250 | svr4_current_sos (void) | |
1251 | { | |
1252 | CORE_ADDR lm; | |
1253 | struct so_list *head = NULL; | |
1254 | struct so_list **link_ptr = &head; | |
1255 | struct svr4_info *info; | |
1256 | struct cleanup *back_to; | |
1257 | int ignore_first; | |
2268b414 JK |
1258 | struct svr4_library_list library_list; |
1259 | ||
0c5bf5a9 JK |
1260 | /* Fall back to manual examination of the target if the packet is not |
1261 | supported or gdbserver failed to find DT_DEBUG. gdb.server/solib-list.exp | |
1262 | tests a case where gdbserver cannot find the shared libraries list while | |
1263 | GDB itself is able to find it via SYMFILE_OBJFILE. | |
1264 | ||
1265 | Unfortunately statically linked inferiors will also fall back through this | |
1266 | suboptimal code path. */ | |
1267 | ||
2268b414 JK |
1268 | if (svr4_current_sos_via_xfer_libraries (&library_list)) |
1269 | { | |
1270 | if (library_list.main_lm) | |
1271 | { | |
1272 | info = get_svr4_info (); | |
1273 | info->main_lm_addr = library_list.main_lm; | |
1274 | } | |
1275 | ||
1276 | return library_list.head ? library_list.head : svr4_default_sos (); | |
1277 | } | |
cb08cc53 JK |
1278 | |
1279 | info = get_svr4_info (); | |
1280 | ||
1281 | /* Always locate the debug struct, in case it has moved. */ | |
1282 | info->debug_base = 0; | |
1283 | locate_base (info); | |
1284 | ||
1285 | /* If we can't find the dynamic linker's base structure, this | |
1286 | must not be a dynamically linked executable. Hmm. */ | |
1287 | if (! info->debug_base) | |
1288 | return svr4_default_sos (); | |
1289 | ||
1290 | /* Assume that everything is a library if the dynamic loader was loaded | |
1291 | late by a static executable. */ | |
1292 | if (exec_bfd && bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL) | |
1293 | ignore_first = 0; | |
1294 | else | |
1295 | ignore_first = 1; | |
1296 | ||
1297 | back_to = make_cleanup (svr4_free_library_list, &head); | |
1298 | ||
1299 | /* Walk the inferior's link map list, and build our list of | |
1300 | `struct so_list' nodes. */ | |
1301 | lm = solib_svr4_r_map (info); | |
1302 | if (lm) | |
1303 | svr4_read_so_list (lm, &link_ptr, ignore_first); | |
1304 | ||
1305 | /* On Solaris, the dynamic linker is not in the normal list of | |
1306 | shared objects, so make sure we pick it up too. Having | |
1307 | symbol information for the dynamic linker is quite crucial | |
1308 | for skipping dynamic linker resolver code. */ | |
1309 | lm = solib_svr4_r_ldsomap (info); | |
1310 | if (lm) | |
1311 | svr4_read_so_list (lm, &link_ptr, 0); | |
1312 | ||
1313 | discard_cleanups (back_to); | |
13437d4b | 1314 | |
34439770 DJ |
1315 | if (head == NULL) |
1316 | return svr4_default_sos (); | |
1317 | ||
13437d4b KB |
1318 | return head; |
1319 | } | |
1320 | ||
93a57060 | 1321 | /* Get the address of the link_map for a given OBJFILE. */ |
bc4a16ae EZ |
1322 | |
1323 | CORE_ADDR | |
1324 | svr4_fetch_objfile_link_map (struct objfile *objfile) | |
1325 | { | |
93a57060 | 1326 | struct so_list *so; |
6c95b8df | 1327 | struct svr4_info *info = get_svr4_info (); |
bc4a16ae | 1328 | |
93a57060 | 1329 | /* Cause svr4_current_sos() to be run if it hasn't been already. */ |
1a816a87 | 1330 | if (info->main_lm_addr == 0) |
93a57060 | 1331 | solib_add (NULL, 0, ¤t_target, auto_solib_add); |
bc4a16ae | 1332 | |
93a57060 DJ |
1333 | /* svr4_current_sos() will set main_lm_addr for the main executable. */ |
1334 | if (objfile == symfile_objfile) | |
1a816a87 | 1335 | return info->main_lm_addr; |
93a57060 DJ |
1336 | |
1337 | /* The other link map addresses may be found by examining the list | |
1338 | of shared libraries. */ | |
1339 | for (so = master_so_list (); so; so = so->next) | |
1340 | if (so->objfile == objfile) | |
1341 | return so->lm_info->lm_addr; | |
1342 | ||
1343 | /* Not found! */ | |
bc4a16ae EZ |
1344 | return 0; |
1345 | } | |
13437d4b KB |
1346 | |
1347 | /* On some systems, the only way to recognize the link map entry for | |
1348 | the main executable file is by looking at its name. Return | |
1349 | non-zero iff SONAME matches one of the known main executable names. */ | |
1350 | ||
1351 | static int | |
bc043ef3 | 1352 | match_main (const char *soname) |
13437d4b | 1353 | { |
bc043ef3 | 1354 | const char * const *mainp; |
13437d4b KB |
1355 | |
1356 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
1357 | { | |
1358 | if (strcmp (soname, *mainp) == 0) | |
1359 | return (1); | |
1360 | } | |
1361 | ||
1362 | return (0); | |
1363 | } | |
1364 | ||
13437d4b KB |
1365 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
1366 | SVR4 run time loader. */ | |
13437d4b | 1367 | |
7d522c90 | 1368 | int |
d7fa2ae2 | 1369 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) |
13437d4b | 1370 | { |
6c95b8df PA |
1371 | struct svr4_info *info = get_svr4_info (); |
1372 | ||
1373 | return ((pc >= info->interp_text_sect_low | |
1374 | && pc < info->interp_text_sect_high) | |
1375 | || (pc >= info->interp_plt_sect_low | |
1376 | && pc < info->interp_plt_sect_high) | |
0875794a JK |
1377 | || in_plt_section (pc, NULL) |
1378 | || in_gnu_ifunc_stub (pc)); | |
13437d4b | 1379 | } |
13437d4b | 1380 | |
2f4950cd AC |
1381 | /* Given an executable's ABFD and target, compute the entry-point |
1382 | address. */ | |
1383 | ||
1384 | static CORE_ADDR | |
1385 | exec_entry_point (struct bfd *abfd, struct target_ops *targ) | |
1386 | { | |
8c2b9656 YQ |
1387 | CORE_ADDR addr; |
1388 | ||
2f4950cd AC |
1389 | /* KevinB wrote ... for most targets, the address returned by |
1390 | bfd_get_start_address() is the entry point for the start | |
1391 | function. But, for some targets, bfd_get_start_address() returns | |
1392 | the address of a function descriptor from which the entry point | |
1393 | address may be extracted. This address is extracted by | |
1394 | gdbarch_convert_from_func_ptr_addr(). The method | |
1395 | gdbarch_convert_from_func_ptr_addr() is the merely the identify | |
1396 | function for targets which don't use function descriptors. */ | |
8c2b9656 | 1397 | addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
2f4950cd AC |
1398 | bfd_get_start_address (abfd), |
1399 | targ); | |
8c2b9656 | 1400 | return gdbarch_addr_bits_remove (target_gdbarch (), addr); |
2f4950cd | 1401 | } |
13437d4b | 1402 | |
cb457ae2 YQ |
1403 | /* Helper function for gdb_bfd_lookup_symbol. */ |
1404 | ||
1405 | static int | |
1406 | cmp_name_and_sec_flags (asymbol *sym, void *data) | |
1407 | { | |
1408 | return (strcmp (sym->name, (const char *) data) == 0 | |
1409 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0); | |
1410 | } | |
7f86f058 | 1411 | /* Arrange for dynamic linker to hit breakpoint. |
13437d4b KB |
1412 | |
1413 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1414 | debugger interface, support for arranging for the inferior to hit | |
1415 | a breakpoint after mapping in the shared libraries. This function | |
1416 | enables that breakpoint. | |
1417 | ||
1418 | For SunOS, there is a special flag location (in_debugger) which we | |
1419 | set to 1. When the dynamic linker sees this flag set, it will set | |
1420 | a breakpoint at a location known only to itself, after saving the | |
1421 | original contents of that place and the breakpoint address itself, | |
1422 | in it's own internal structures. When we resume the inferior, it | |
1423 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1424 | We handle this (in a different place) by restoring the contents of | |
1425 | the breakpointed location (which is only known after it stops), | |
1426 | chasing around to locate the shared libraries that have been | |
1427 | loaded, then resuming. | |
1428 | ||
1429 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1430 | which is statically initialized at the time the shared library is | |
1431 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1432 | teed to be called once before mapping in a library, and again when | |
1433 | the mapping is complete. At the time we are examining this member, | |
1434 | it contains only the unrelocated offset of the function, so we have | |
1435 | to do our own relocation. Later, when the dynamic linker actually | |
1436 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1437 | ||
1438 | The debugger interface structure also contains an enumeration which | |
1439 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1440 | depending upon whether or not the library is being mapped or unmapped, | |
7f86f058 | 1441 | and then set to RT_CONSISTENT after the library is mapped/unmapped. */ |
13437d4b KB |
1442 | |
1443 | static int | |
268a4a75 | 1444 | enable_break (struct svr4_info *info, int from_tty) |
13437d4b | 1445 | { |
13437d4b | 1446 | struct minimal_symbol *msymbol; |
bc043ef3 | 1447 | const char * const *bkpt_namep; |
13437d4b | 1448 | asection *interp_sect; |
97ec2c2f | 1449 | gdb_byte *interp_name; |
7cd25cfc | 1450 | CORE_ADDR sym_addr; |
13437d4b | 1451 | |
6c95b8df PA |
1452 | info->interp_text_sect_low = info->interp_text_sect_high = 0; |
1453 | info->interp_plt_sect_low = info->interp_plt_sect_high = 0; | |
13437d4b | 1454 | |
7cd25cfc DJ |
1455 | /* If we already have a shared library list in the target, and |
1456 | r_debug contains r_brk, set the breakpoint there - this should | |
1457 | mean r_brk has already been relocated. Assume the dynamic linker | |
1458 | is the object containing r_brk. */ | |
1459 | ||
268a4a75 | 1460 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
7cd25cfc | 1461 | sym_addr = 0; |
1a816a87 PA |
1462 | if (info->debug_base && solib_svr4_r_map (info) != 0) |
1463 | sym_addr = solib_svr4_r_brk (info); | |
7cd25cfc DJ |
1464 | |
1465 | if (sym_addr != 0) | |
1466 | { | |
1467 | struct obj_section *os; | |
1468 | ||
b36ec657 | 1469 | sym_addr = gdbarch_addr_bits_remove |
f5656ead | 1470 | (target_gdbarch (), gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
3e43a32a MS |
1471 | sym_addr, |
1472 | ¤t_target)); | |
b36ec657 | 1473 | |
48379de6 DE |
1474 | /* On at least some versions of Solaris there's a dynamic relocation |
1475 | on _r_debug.r_brk and SYM_ADDR may not be relocated yet, e.g., if | |
1476 | we get control before the dynamic linker has self-relocated. | |
1477 | Check if SYM_ADDR is in a known section, if it is assume we can | |
1478 | trust its value. This is just a heuristic though, it could go away | |
1479 | or be replaced if it's getting in the way. | |
1480 | ||
1481 | On ARM we need to know whether the ISA of rtld_db_dlactivity (or | |
1482 | however it's spelled in your particular system) is ARM or Thumb. | |
1483 | That knowledge is encoded in the address, if it's Thumb the low bit | |
1484 | is 1. However, we've stripped that info above and it's not clear | |
1485 | what all the consequences are of passing a non-addr_bits_remove'd | |
1486 | address to create_solib_event_breakpoint. The call to | |
1487 | find_pc_section verifies we know about the address and have some | |
1488 | hope of computing the right kind of breakpoint to use (via | |
1489 | symbol info). It does mean that GDB needs to be pointed at a | |
1490 | non-stripped version of the dynamic linker in order to obtain | |
1491 | information it already knows about. Sigh. */ | |
1492 | ||
7cd25cfc DJ |
1493 | os = find_pc_section (sym_addr); |
1494 | if (os != NULL) | |
1495 | { | |
1496 | /* Record the relocated start and end address of the dynamic linker | |
1497 | text and plt section for svr4_in_dynsym_resolve_code. */ | |
1498 | bfd *tmp_bfd; | |
1499 | CORE_ADDR load_addr; | |
1500 | ||
1501 | tmp_bfd = os->objfile->obfd; | |
1502 | load_addr = ANOFFSET (os->objfile->section_offsets, | |
e03e6279 | 1503 | SECT_OFF_TEXT (os->objfile)); |
7cd25cfc DJ |
1504 | |
1505 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
1506 | if (interp_sect) | |
1507 | { | |
6c95b8df | 1508 | info->interp_text_sect_low = |
7cd25cfc | 1509 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1510 | info->interp_text_sect_high = |
1511 | info->interp_text_sect_low | |
1512 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1513 | } |
1514 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1515 | if (interp_sect) | |
1516 | { | |
6c95b8df | 1517 | info->interp_plt_sect_low = |
7cd25cfc | 1518 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1519 | info->interp_plt_sect_high = |
1520 | info->interp_plt_sect_low | |
1521 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1522 | } |
1523 | ||
f5656ead | 1524 | create_solib_event_breakpoint (target_gdbarch (), sym_addr); |
7cd25cfc DJ |
1525 | return 1; |
1526 | } | |
1527 | } | |
1528 | ||
97ec2c2f | 1529 | /* Find the program interpreter; if not found, warn the user and drop |
13437d4b | 1530 | into the old breakpoint at symbol code. */ |
97ec2c2f UW |
1531 | interp_name = find_program_interpreter (); |
1532 | if (interp_name) | |
13437d4b | 1533 | { |
8ad2fcde KB |
1534 | CORE_ADDR load_addr = 0; |
1535 | int load_addr_found = 0; | |
2ec9a4f8 | 1536 | int loader_found_in_list = 0; |
f8766ec1 | 1537 | struct so_list *so; |
e4f7b8c8 | 1538 | bfd *tmp_bfd = NULL; |
2f4950cd | 1539 | struct target_ops *tmp_bfd_target; |
f1838a98 | 1540 | volatile struct gdb_exception ex; |
13437d4b | 1541 | |
7cd25cfc | 1542 | sym_addr = 0; |
13437d4b KB |
1543 | |
1544 | /* Now we need to figure out where the dynamic linker was | |
1545 | loaded so that we can load its symbols and place a breakpoint | |
1546 | in the dynamic linker itself. | |
1547 | ||
1548 | This address is stored on the stack. However, I've been unable | |
1549 | to find any magic formula to find it for Solaris (appears to | |
1550 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1551 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 | 1552 | |
f1838a98 UW |
1553 | TRY_CATCH (ex, RETURN_MASK_ALL) |
1554 | { | |
97ec2c2f | 1555 | tmp_bfd = solib_bfd_open (interp_name); |
f1838a98 | 1556 | } |
13437d4b KB |
1557 | if (tmp_bfd == NULL) |
1558 | goto bkpt_at_symbol; | |
1559 | ||
2f4950cd | 1560 | /* Now convert the TMP_BFD into a target. That way target, as |
695c3173 | 1561 | well as BFD operations can be used. */ |
2f4950cd | 1562 | tmp_bfd_target = target_bfd_reopen (tmp_bfd); |
695c3173 TT |
1563 | /* target_bfd_reopen acquired its own reference, so we can |
1564 | release ours now. */ | |
1565 | gdb_bfd_unref (tmp_bfd); | |
2f4950cd | 1566 | |
f8766ec1 KB |
1567 | /* On a running target, we can get the dynamic linker's base |
1568 | address from the shared library table. */ | |
f8766ec1 KB |
1569 | so = master_so_list (); |
1570 | while (so) | |
8ad2fcde | 1571 | { |
97ec2c2f | 1572 | if (svr4_same_1 (interp_name, so->so_original_name)) |
8ad2fcde KB |
1573 | { |
1574 | load_addr_found = 1; | |
2ec9a4f8 | 1575 | loader_found_in_list = 1; |
b23518f0 | 1576 | load_addr = lm_addr_check (so, tmp_bfd); |
8ad2fcde KB |
1577 | break; |
1578 | } | |
f8766ec1 | 1579 | so = so->next; |
8ad2fcde KB |
1580 | } |
1581 | ||
8d4e36ba JB |
1582 | /* If we were not able to find the base address of the loader |
1583 | from our so_list, then try using the AT_BASE auxilliary entry. */ | |
1584 | if (!load_addr_found) | |
1585 | if (target_auxv_search (¤t_target, AT_BASE, &load_addr) > 0) | |
ad3a0e5b | 1586 | { |
f5656ead | 1587 | int addr_bit = gdbarch_addr_bit (target_gdbarch ()); |
ad3a0e5b JK |
1588 | |
1589 | /* Ensure LOAD_ADDR has proper sign in its possible upper bits so | |
1590 | that `+ load_addr' will overflow CORE_ADDR width not creating | |
1591 | invalid addresses like 0x101234567 for 32bit inferiors on 64bit | |
1592 | GDB. */ | |
1593 | ||
d182d057 | 1594 | if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT)) |
ad3a0e5b | 1595 | { |
d182d057 | 1596 | CORE_ADDR space_size = (CORE_ADDR) 1 << addr_bit; |
ad3a0e5b JK |
1597 | CORE_ADDR tmp_entry_point = exec_entry_point (tmp_bfd, |
1598 | tmp_bfd_target); | |
1599 | ||
1600 | gdb_assert (load_addr < space_size); | |
1601 | ||
1602 | /* TMP_ENTRY_POINT exceeding SPACE_SIZE would be for prelinked | |
1603 | 64bit ld.so with 32bit executable, it should not happen. */ | |
1604 | ||
1605 | if (tmp_entry_point < space_size | |
1606 | && tmp_entry_point + load_addr >= space_size) | |
1607 | load_addr -= space_size; | |
1608 | } | |
1609 | ||
1610 | load_addr_found = 1; | |
1611 | } | |
8d4e36ba | 1612 | |
8ad2fcde KB |
1613 | /* Otherwise we find the dynamic linker's base address by examining |
1614 | the current pc (which should point at the entry point for the | |
8d4e36ba JB |
1615 | dynamic linker) and subtracting the offset of the entry point. |
1616 | ||
1617 | This is more fragile than the previous approaches, but is a good | |
1618 | fallback method because it has actually been working well in | |
1619 | most cases. */ | |
8ad2fcde | 1620 | if (!load_addr_found) |
fb14de7b | 1621 | { |
c2250ad1 | 1622 | struct regcache *regcache |
f5656ead | 1623 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch ()); |
433759f7 | 1624 | |
fb14de7b UW |
1625 | load_addr = (regcache_read_pc (regcache) |
1626 | - exec_entry_point (tmp_bfd, tmp_bfd_target)); | |
1627 | } | |
2ec9a4f8 DJ |
1628 | |
1629 | if (!loader_found_in_list) | |
34439770 | 1630 | { |
1a816a87 PA |
1631 | info->debug_loader_name = xstrdup (interp_name); |
1632 | info->debug_loader_offset_p = 1; | |
1633 | info->debug_loader_offset = load_addr; | |
268a4a75 | 1634 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
34439770 | 1635 | } |
13437d4b KB |
1636 | |
1637 | /* Record the relocated start and end address of the dynamic linker | |
d7fa2ae2 | 1638 | text and plt section for svr4_in_dynsym_resolve_code. */ |
13437d4b KB |
1639 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1640 | if (interp_sect) | |
1641 | { | |
6c95b8df | 1642 | info->interp_text_sect_low = |
13437d4b | 1643 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1644 | info->interp_text_sect_high = |
1645 | info->interp_text_sect_low | |
1646 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1647 | } |
1648 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1649 | if (interp_sect) | |
1650 | { | |
6c95b8df | 1651 | info->interp_plt_sect_low = |
13437d4b | 1652 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1653 | info->interp_plt_sect_high = |
1654 | info->interp_plt_sect_low | |
1655 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1656 | } |
1657 | ||
1658 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1659 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1660 | { | |
cb457ae2 YQ |
1661 | sym_addr = gdb_bfd_lookup_symbol (tmp_bfd, cmp_name_and_sec_flags, |
1662 | (void *) *bkpt_namep); | |
13437d4b KB |
1663 | if (sym_addr != 0) |
1664 | break; | |
1665 | } | |
1666 | ||
2bbe3cc1 DJ |
1667 | if (sym_addr != 0) |
1668 | /* Convert 'sym_addr' from a function pointer to an address. | |
1669 | Because we pass tmp_bfd_target instead of the current | |
1670 | target, this will always produce an unrelocated value. */ | |
f5656ead | 1671 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
2bbe3cc1 DJ |
1672 | sym_addr, |
1673 | tmp_bfd_target); | |
1674 | ||
695c3173 TT |
1675 | /* We're done with both the temporary bfd and target. Closing |
1676 | the target closes the underlying bfd, because it holds the | |
1677 | only remaining reference. */ | |
460014f5 | 1678 | target_close (tmp_bfd_target); |
13437d4b KB |
1679 | |
1680 | if (sym_addr != 0) | |
1681 | { | |
f5656ead | 1682 | create_solib_event_breakpoint (target_gdbarch (), load_addr + sym_addr); |
97ec2c2f | 1683 | xfree (interp_name); |
13437d4b KB |
1684 | return 1; |
1685 | } | |
1686 | ||
1687 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1688 | linker. Warn and drop into the old code. */ | |
1689 | bkpt_at_symbol: | |
97ec2c2f | 1690 | xfree (interp_name); |
82d03102 PG |
1691 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
1692 | "GDB will be unable to debug shared library initializers\n" | |
1693 | "and track explicitly loaded dynamic code.")); | |
13437d4b | 1694 | } |
13437d4b | 1695 | |
e499d0f1 DJ |
1696 | /* Scan through the lists of symbols, trying to look up the symbol and |
1697 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1698 | ||
1699 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1700 | { | |
1701 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1702 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1703 | { | |
de64a9ac | 1704 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
f5656ead | 1705 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
de64a9ac JM |
1706 | sym_addr, |
1707 | ¤t_target); | |
f5656ead | 1708 | create_solib_event_breakpoint (target_gdbarch (), sym_addr); |
e499d0f1 DJ |
1709 | return 1; |
1710 | } | |
1711 | } | |
13437d4b | 1712 | |
fb139f32 | 1713 | if (interp_name != NULL && !current_inferior ()->attach_flag) |
13437d4b | 1714 | { |
c6490bf2 | 1715 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) |
13437d4b | 1716 | { |
c6490bf2 KB |
1717 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); |
1718 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1719 | { | |
1720 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
f5656ead | 1721 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), |
c6490bf2 KB |
1722 | sym_addr, |
1723 | ¤t_target); | |
f5656ead | 1724 | create_solib_event_breakpoint (target_gdbarch (), sym_addr); |
c6490bf2 KB |
1725 | return 1; |
1726 | } | |
13437d4b KB |
1727 | } |
1728 | } | |
542c95c2 | 1729 | return 0; |
13437d4b KB |
1730 | } |
1731 | ||
7f86f058 | 1732 | /* Implement the "special_symbol_handling" target_so_ops method. */ |
13437d4b KB |
1733 | |
1734 | static void | |
1735 | svr4_special_symbol_handling (void) | |
1736 | { | |
7f86f058 | 1737 | /* Nothing to do. */ |
13437d4b KB |
1738 | } |
1739 | ||
09919ac2 JK |
1740 | /* Read the ELF program headers from ABFD. Return the contents and |
1741 | set *PHDRS_SIZE to the size of the program headers. */ | |
e2a44558 | 1742 | |
09919ac2 JK |
1743 | static gdb_byte * |
1744 | read_program_headers_from_bfd (bfd *abfd, int *phdrs_size) | |
e2a44558 | 1745 | { |
09919ac2 JK |
1746 | Elf_Internal_Ehdr *ehdr; |
1747 | gdb_byte *buf; | |
e2a44558 | 1748 | |
09919ac2 | 1749 | ehdr = elf_elfheader (abfd); |
b8040f19 | 1750 | |
09919ac2 JK |
1751 | *phdrs_size = ehdr->e_phnum * ehdr->e_phentsize; |
1752 | if (*phdrs_size == 0) | |
1753 | return NULL; | |
1754 | ||
1755 | buf = xmalloc (*phdrs_size); | |
1756 | if (bfd_seek (abfd, ehdr->e_phoff, SEEK_SET) != 0 | |
1757 | || bfd_bread (buf, *phdrs_size, abfd) != *phdrs_size) | |
1758 | { | |
1759 | xfree (buf); | |
1760 | return NULL; | |
1761 | } | |
1762 | ||
1763 | return buf; | |
b8040f19 JK |
1764 | } |
1765 | ||
01c30d6e JK |
1766 | /* Return 1 and fill *DISPLACEMENTP with detected PIE offset of inferior |
1767 | exec_bfd. Otherwise return 0. | |
1768 | ||
1769 | We relocate all of the sections by the same amount. This | |
c378eb4e | 1770 | behavior is mandated by recent editions of the System V ABI. |
b8040f19 JK |
1771 | According to the System V Application Binary Interface, |
1772 | Edition 4.1, page 5-5: | |
1773 | ||
1774 | ... Though the system chooses virtual addresses for | |
1775 | individual processes, it maintains the segments' relative | |
1776 | positions. Because position-independent code uses relative | |
1777 | addressesing between segments, the difference between | |
1778 | virtual addresses in memory must match the difference | |
1779 | between virtual addresses in the file. The difference | |
1780 | between the virtual address of any segment in memory and | |
1781 | the corresponding virtual address in the file is thus a | |
1782 | single constant value for any one executable or shared | |
1783 | object in a given process. This difference is the base | |
1784 | address. One use of the base address is to relocate the | |
1785 | memory image of the program during dynamic linking. | |
1786 | ||
1787 | The same language also appears in Edition 4.0 of the System V | |
09919ac2 JK |
1788 | ABI and is left unspecified in some of the earlier editions. |
1789 | ||
1790 | Decide if the objfile needs to be relocated. As indicated above, we will | |
1791 | only be here when execution is stopped. But during attachment PC can be at | |
1792 | arbitrary address therefore regcache_read_pc can be misleading (contrary to | |
1793 | the auxv AT_ENTRY value). Moreover for executable with interpreter section | |
1794 | regcache_read_pc would point to the interpreter and not the main executable. | |
1795 | ||
1796 | So, to summarize, relocations are necessary when the start address obtained | |
1797 | from the executable is different from the address in auxv AT_ENTRY entry. | |
d989b283 | 1798 | |
09919ac2 JK |
1799 | [ The astute reader will note that we also test to make sure that |
1800 | the executable in question has the DYNAMIC flag set. It is my | |
1801 | opinion that this test is unnecessary (undesirable even). It | |
1802 | was added to avoid inadvertent relocation of an executable | |
1803 | whose e_type member in the ELF header is not ET_DYN. There may | |
1804 | be a time in the future when it is desirable to do relocations | |
1805 | on other types of files as well in which case this condition | |
1806 | should either be removed or modified to accomodate the new file | |
1807 | type. - Kevin, Nov 2000. ] */ | |
b8040f19 | 1808 | |
01c30d6e JK |
1809 | static int |
1810 | svr4_exec_displacement (CORE_ADDR *displacementp) | |
b8040f19 | 1811 | { |
41752192 JK |
1812 | /* ENTRY_POINT is a possible function descriptor - before |
1813 | a call to gdbarch_convert_from_func_ptr_addr. */ | |
09919ac2 | 1814 | CORE_ADDR entry_point, displacement; |
b8040f19 JK |
1815 | |
1816 | if (exec_bfd == NULL) | |
1817 | return 0; | |
1818 | ||
09919ac2 JK |
1819 | /* Therefore for ELF it is ET_EXEC and not ET_DYN. Both shared libraries |
1820 | being executed themselves and PIE (Position Independent Executable) | |
1821 | executables are ET_DYN. */ | |
1822 | ||
1823 | if ((bfd_get_file_flags (exec_bfd) & DYNAMIC) == 0) | |
1824 | return 0; | |
1825 | ||
1826 | if (target_auxv_search (¤t_target, AT_ENTRY, &entry_point) <= 0) | |
1827 | return 0; | |
1828 | ||
1829 | displacement = entry_point - bfd_get_start_address (exec_bfd); | |
1830 | ||
1831 | /* Verify the DISPLACEMENT candidate complies with the required page | |
1832 | alignment. It is cheaper than the program headers comparison below. */ | |
1833 | ||
1834 | if (bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
1835 | { | |
1836 | const struct elf_backend_data *elf = get_elf_backend_data (exec_bfd); | |
1837 | ||
1838 | /* p_align of PT_LOAD segments does not specify any alignment but | |
1839 | only congruency of addresses: | |
1840 | p_offset % p_align == p_vaddr % p_align | |
1841 | Kernel is free to load the executable with lower alignment. */ | |
1842 | ||
1843 | if ((displacement & (elf->minpagesize - 1)) != 0) | |
1844 | return 0; | |
1845 | } | |
1846 | ||
1847 | /* Verify that the auxilliary vector describes the same file as exec_bfd, by | |
1848 | comparing their program headers. If the program headers in the auxilliary | |
1849 | vector do not match the program headers in the executable, then we are | |
1850 | looking at a different file than the one used by the kernel - for | |
1851 | instance, "gdb program" connected to "gdbserver :PORT ld.so program". */ | |
1852 | ||
1853 | if (bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
1854 | { | |
1855 | /* Be optimistic and clear OK only if GDB was able to verify the headers | |
1856 | really do not match. */ | |
1857 | int phdrs_size, phdrs2_size, ok = 1; | |
1858 | gdb_byte *buf, *buf2; | |
0a1e94c7 | 1859 | int arch_size; |
09919ac2 | 1860 | |
0a1e94c7 | 1861 | buf = read_program_header (-1, &phdrs_size, &arch_size); |
09919ac2 | 1862 | buf2 = read_program_headers_from_bfd (exec_bfd, &phdrs2_size); |
0a1e94c7 JK |
1863 | if (buf != NULL && buf2 != NULL) |
1864 | { | |
f5656ead | 1865 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
0a1e94c7 JK |
1866 | |
1867 | /* We are dealing with three different addresses. EXEC_BFD | |
1868 | represents current address in on-disk file. target memory content | |
1869 | may be different from EXEC_BFD as the file may have been prelinked | |
1870 | to a different address after the executable has been loaded. | |
1871 | Moreover the address of placement in target memory can be | |
3e43a32a MS |
1872 | different from what the program headers in target memory say - |
1873 | this is the goal of PIE. | |
0a1e94c7 JK |
1874 | |
1875 | Detected DISPLACEMENT covers both the offsets of PIE placement and | |
1876 | possible new prelink performed after start of the program. Here | |
1877 | relocate BUF and BUF2 just by the EXEC_BFD vs. target memory | |
1878 | content offset for the verification purpose. */ | |
1879 | ||
1880 | if (phdrs_size != phdrs2_size | |
1881 | || bfd_get_arch_size (exec_bfd) != arch_size) | |
1882 | ok = 0; | |
3e43a32a MS |
1883 | else if (arch_size == 32 |
1884 | && phdrs_size >= sizeof (Elf32_External_Phdr) | |
0a1e94c7 JK |
1885 | && phdrs_size % sizeof (Elf32_External_Phdr) == 0) |
1886 | { | |
1887 | Elf_Internal_Ehdr *ehdr2 = elf_tdata (exec_bfd)->elf_header; | |
1888 | Elf_Internal_Phdr *phdr2 = elf_tdata (exec_bfd)->phdr; | |
1889 | CORE_ADDR displacement = 0; | |
1890 | int i; | |
1891 | ||
1892 | /* DISPLACEMENT could be found more easily by the difference of | |
1893 | ehdr2->e_entry. But we haven't read the ehdr yet, and we | |
1894 | already have enough information to compute that displacement | |
1895 | with what we've read. */ | |
1896 | ||
1897 | for (i = 0; i < ehdr2->e_phnum; i++) | |
1898 | if (phdr2[i].p_type == PT_LOAD) | |
1899 | { | |
1900 | Elf32_External_Phdr *phdrp; | |
1901 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
1902 | CORE_ADDR vaddr, paddr; | |
1903 | CORE_ADDR displacement_vaddr = 0; | |
1904 | CORE_ADDR displacement_paddr = 0; | |
1905 | ||
1906 | phdrp = &((Elf32_External_Phdr *) buf)[i]; | |
1907 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; | |
1908 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
1909 | ||
1910 | vaddr = extract_unsigned_integer (buf_vaddr_p, 4, | |
1911 | byte_order); | |
1912 | displacement_vaddr = vaddr - phdr2[i].p_vaddr; | |
1913 | ||
1914 | paddr = extract_unsigned_integer (buf_paddr_p, 4, | |
1915 | byte_order); | |
1916 | displacement_paddr = paddr - phdr2[i].p_paddr; | |
1917 | ||
1918 | if (displacement_vaddr == displacement_paddr) | |
1919 | displacement = displacement_vaddr; | |
1920 | ||
1921 | break; | |
1922 | } | |
1923 | ||
1924 | /* Now compare BUF and BUF2 with optional DISPLACEMENT. */ | |
1925 | ||
1926 | for (i = 0; i < phdrs_size / sizeof (Elf32_External_Phdr); i++) | |
1927 | { | |
1928 | Elf32_External_Phdr *phdrp; | |
1929 | Elf32_External_Phdr *phdr2p; | |
1930 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
1931 | CORE_ADDR vaddr, paddr; | |
43b8e241 | 1932 | asection *plt2_asect; |
0a1e94c7 JK |
1933 | |
1934 | phdrp = &((Elf32_External_Phdr *) buf)[i]; | |
1935 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; | |
1936 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
1937 | phdr2p = &((Elf32_External_Phdr *) buf2)[i]; | |
1938 | ||
1939 | /* PT_GNU_STACK is an exception by being never relocated by | |
1940 | prelink as its addresses are always zero. */ | |
1941 | ||
1942 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
1943 | continue; | |
1944 | ||
1945 | /* Check also other adjustment combinations - PR 11786. */ | |
1946 | ||
3e43a32a MS |
1947 | vaddr = extract_unsigned_integer (buf_vaddr_p, 4, |
1948 | byte_order); | |
0a1e94c7 JK |
1949 | vaddr -= displacement; |
1950 | store_unsigned_integer (buf_vaddr_p, 4, byte_order, vaddr); | |
1951 | ||
3e43a32a MS |
1952 | paddr = extract_unsigned_integer (buf_paddr_p, 4, |
1953 | byte_order); | |
0a1e94c7 JK |
1954 | paddr -= displacement; |
1955 | store_unsigned_integer (buf_paddr_p, 4, byte_order, paddr); | |
1956 | ||
1957 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
1958 | continue; | |
1959 | ||
43b8e241 JK |
1960 | /* prelink can convert .plt SHT_NOBITS to SHT_PROGBITS. */ |
1961 | plt2_asect = bfd_get_section_by_name (exec_bfd, ".plt"); | |
1962 | if (plt2_asect) | |
1963 | { | |
1964 | int content2; | |
1965 | gdb_byte *buf_filesz_p = (gdb_byte *) &phdrp->p_filesz; | |
1966 | CORE_ADDR filesz; | |
1967 | ||
1968 | content2 = (bfd_get_section_flags (exec_bfd, plt2_asect) | |
1969 | & SEC_HAS_CONTENTS) != 0; | |
1970 | ||
1971 | filesz = extract_unsigned_integer (buf_filesz_p, 4, | |
1972 | byte_order); | |
1973 | ||
1974 | /* PLT2_ASECT is from on-disk file (exec_bfd) while | |
1975 | FILESZ is from the in-memory image. */ | |
1976 | if (content2) | |
1977 | filesz += bfd_get_section_size (plt2_asect); | |
1978 | else | |
1979 | filesz -= bfd_get_section_size (plt2_asect); | |
1980 | ||
1981 | store_unsigned_integer (buf_filesz_p, 4, byte_order, | |
1982 | filesz); | |
1983 | ||
1984 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
1985 | continue; | |
1986 | } | |
1987 | ||
0a1e94c7 JK |
1988 | ok = 0; |
1989 | break; | |
1990 | } | |
1991 | } | |
3e43a32a MS |
1992 | else if (arch_size == 64 |
1993 | && phdrs_size >= sizeof (Elf64_External_Phdr) | |
0a1e94c7 JK |
1994 | && phdrs_size % sizeof (Elf64_External_Phdr) == 0) |
1995 | { | |
1996 | Elf_Internal_Ehdr *ehdr2 = elf_tdata (exec_bfd)->elf_header; | |
1997 | Elf_Internal_Phdr *phdr2 = elf_tdata (exec_bfd)->phdr; | |
1998 | CORE_ADDR displacement = 0; | |
1999 | int i; | |
2000 | ||
2001 | /* DISPLACEMENT could be found more easily by the difference of | |
2002 | ehdr2->e_entry. But we haven't read the ehdr yet, and we | |
2003 | already have enough information to compute that displacement | |
2004 | with what we've read. */ | |
2005 | ||
2006 | for (i = 0; i < ehdr2->e_phnum; i++) | |
2007 | if (phdr2[i].p_type == PT_LOAD) | |
2008 | { | |
2009 | Elf64_External_Phdr *phdrp; | |
2010 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
2011 | CORE_ADDR vaddr, paddr; | |
2012 | CORE_ADDR displacement_vaddr = 0; | |
2013 | CORE_ADDR displacement_paddr = 0; | |
2014 | ||
2015 | phdrp = &((Elf64_External_Phdr *) buf)[i]; | |
2016 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; | |
2017 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
2018 | ||
2019 | vaddr = extract_unsigned_integer (buf_vaddr_p, 8, | |
2020 | byte_order); | |
2021 | displacement_vaddr = vaddr - phdr2[i].p_vaddr; | |
2022 | ||
2023 | paddr = extract_unsigned_integer (buf_paddr_p, 8, | |
2024 | byte_order); | |
2025 | displacement_paddr = paddr - phdr2[i].p_paddr; | |
2026 | ||
2027 | if (displacement_vaddr == displacement_paddr) | |
2028 | displacement = displacement_vaddr; | |
2029 | ||
2030 | break; | |
2031 | } | |
2032 | ||
2033 | /* Now compare BUF and BUF2 with optional DISPLACEMENT. */ | |
2034 | ||
2035 | for (i = 0; i < phdrs_size / sizeof (Elf64_External_Phdr); i++) | |
2036 | { | |
2037 | Elf64_External_Phdr *phdrp; | |
2038 | Elf64_External_Phdr *phdr2p; | |
2039 | gdb_byte *buf_vaddr_p, *buf_paddr_p; | |
2040 | CORE_ADDR vaddr, paddr; | |
43b8e241 | 2041 | asection *plt2_asect; |
0a1e94c7 JK |
2042 | |
2043 | phdrp = &((Elf64_External_Phdr *) buf)[i]; | |
2044 | buf_vaddr_p = (gdb_byte *) &phdrp->p_vaddr; | |
2045 | buf_paddr_p = (gdb_byte *) &phdrp->p_paddr; | |
2046 | phdr2p = &((Elf64_External_Phdr *) buf2)[i]; | |
2047 | ||
2048 | /* PT_GNU_STACK is an exception by being never relocated by | |
2049 | prelink as its addresses are always zero. */ | |
2050 | ||
2051 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2052 | continue; | |
2053 | ||
2054 | /* Check also other adjustment combinations - PR 11786. */ | |
2055 | ||
3e43a32a MS |
2056 | vaddr = extract_unsigned_integer (buf_vaddr_p, 8, |
2057 | byte_order); | |
0a1e94c7 JK |
2058 | vaddr -= displacement; |
2059 | store_unsigned_integer (buf_vaddr_p, 8, byte_order, vaddr); | |
2060 | ||
3e43a32a MS |
2061 | paddr = extract_unsigned_integer (buf_paddr_p, 8, |
2062 | byte_order); | |
0a1e94c7 JK |
2063 | paddr -= displacement; |
2064 | store_unsigned_integer (buf_paddr_p, 8, byte_order, paddr); | |
2065 | ||
2066 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2067 | continue; | |
2068 | ||
43b8e241 JK |
2069 | /* prelink can convert .plt SHT_NOBITS to SHT_PROGBITS. */ |
2070 | plt2_asect = bfd_get_section_by_name (exec_bfd, ".plt"); | |
2071 | if (plt2_asect) | |
2072 | { | |
2073 | int content2; | |
2074 | gdb_byte *buf_filesz_p = (gdb_byte *) &phdrp->p_filesz; | |
2075 | CORE_ADDR filesz; | |
2076 | ||
2077 | content2 = (bfd_get_section_flags (exec_bfd, plt2_asect) | |
2078 | & SEC_HAS_CONTENTS) != 0; | |
2079 | ||
2080 | filesz = extract_unsigned_integer (buf_filesz_p, 8, | |
2081 | byte_order); | |
2082 | ||
2083 | /* PLT2_ASECT is from on-disk file (exec_bfd) while | |
2084 | FILESZ is from the in-memory image. */ | |
2085 | if (content2) | |
2086 | filesz += bfd_get_section_size (plt2_asect); | |
2087 | else | |
2088 | filesz -= bfd_get_section_size (plt2_asect); | |
2089 | ||
2090 | store_unsigned_integer (buf_filesz_p, 8, byte_order, | |
2091 | filesz); | |
2092 | ||
2093 | if (memcmp (phdrp, phdr2p, sizeof (*phdrp)) == 0) | |
2094 | continue; | |
2095 | } | |
2096 | ||
0a1e94c7 JK |
2097 | ok = 0; |
2098 | break; | |
2099 | } | |
2100 | } | |
2101 | else | |
2102 | ok = 0; | |
2103 | } | |
09919ac2 JK |
2104 | |
2105 | xfree (buf); | |
2106 | xfree (buf2); | |
2107 | ||
2108 | if (!ok) | |
2109 | return 0; | |
2110 | } | |
b8040f19 | 2111 | |
ccf26247 JK |
2112 | if (info_verbose) |
2113 | { | |
2114 | /* It can be printed repeatedly as there is no easy way to check | |
2115 | the executable symbols/file has been already relocated to | |
2116 | displacement. */ | |
2117 | ||
2118 | printf_unfiltered (_("Using PIE (Position Independent Executable) " | |
2119 | "displacement %s for \"%s\".\n"), | |
f5656ead | 2120 | paddress (target_gdbarch (), displacement), |
ccf26247 JK |
2121 | bfd_get_filename (exec_bfd)); |
2122 | } | |
2123 | ||
01c30d6e JK |
2124 | *displacementp = displacement; |
2125 | return 1; | |
b8040f19 JK |
2126 | } |
2127 | ||
2128 | /* Relocate the main executable. This function should be called upon | |
c378eb4e | 2129 | stopping the inferior process at the entry point to the program. |
b8040f19 JK |
2130 | The entry point from BFD is compared to the AT_ENTRY of AUXV and if they are |
2131 | different, the main executable is relocated by the proper amount. */ | |
2132 | ||
2133 | static void | |
2134 | svr4_relocate_main_executable (void) | |
2135 | { | |
01c30d6e JK |
2136 | CORE_ADDR displacement; |
2137 | ||
4e5799b6 JK |
2138 | /* If we are re-running this executable, SYMFILE_OBJFILE->SECTION_OFFSETS |
2139 | probably contains the offsets computed using the PIE displacement | |
2140 | from the previous run, which of course are irrelevant for this run. | |
2141 | So we need to determine the new PIE displacement and recompute the | |
2142 | section offsets accordingly, even if SYMFILE_OBJFILE->SECTION_OFFSETS | |
2143 | already contains pre-computed offsets. | |
01c30d6e | 2144 | |
4e5799b6 | 2145 | If we cannot compute the PIE displacement, either: |
01c30d6e | 2146 | |
4e5799b6 JK |
2147 | - The executable is not PIE. |
2148 | ||
2149 | - SYMFILE_OBJFILE does not match the executable started in the target. | |
2150 | This can happen for main executable symbols loaded at the host while | |
2151 | `ld.so --ld-args main-executable' is loaded in the target. | |
2152 | ||
2153 | Then we leave the section offsets untouched and use them as is for | |
2154 | this run. Either: | |
2155 | ||
2156 | - These section offsets were properly reset earlier, and thus | |
2157 | already contain the correct values. This can happen for instance | |
2158 | when reconnecting via the remote protocol to a target that supports | |
2159 | the `qOffsets' packet. | |
2160 | ||
2161 | - The section offsets were not reset earlier, and the best we can | |
c378eb4e | 2162 | hope is that the old offsets are still applicable to the new run. */ |
01c30d6e JK |
2163 | |
2164 | if (! svr4_exec_displacement (&displacement)) | |
2165 | return; | |
b8040f19 | 2166 | |
01c30d6e JK |
2167 | /* Even DISPLACEMENT 0 is a valid new difference of in-memory vs. in-file |
2168 | addresses. */ | |
b8040f19 JK |
2169 | |
2170 | if (symfile_objfile) | |
e2a44558 | 2171 | { |
e2a44558 | 2172 | struct section_offsets *new_offsets; |
b8040f19 | 2173 | int i; |
e2a44558 | 2174 | |
b8040f19 JK |
2175 | new_offsets = alloca (symfile_objfile->num_sections |
2176 | * sizeof (*new_offsets)); | |
e2a44558 | 2177 | |
b8040f19 JK |
2178 | for (i = 0; i < symfile_objfile->num_sections; i++) |
2179 | new_offsets->offsets[i] = displacement; | |
e2a44558 | 2180 | |
b8040f19 | 2181 | objfile_relocate (symfile_objfile, new_offsets); |
e2a44558 | 2182 | } |
51bee8e9 JK |
2183 | else if (exec_bfd) |
2184 | { | |
2185 | asection *asect; | |
2186 | ||
2187 | for (asect = exec_bfd->sections; asect != NULL; asect = asect->next) | |
2188 | exec_set_section_address (bfd_get_filename (exec_bfd), asect->index, | |
2189 | (bfd_section_vma (exec_bfd, asect) | |
2190 | + displacement)); | |
2191 | } | |
e2a44558 KB |
2192 | } |
2193 | ||
7f86f058 | 2194 | /* Implement the "create_inferior_hook" target_solib_ops method. |
13437d4b KB |
2195 | |
2196 | For SVR4 executables, this first instruction is either the first | |
2197 | instruction in the dynamic linker (for dynamically linked | |
2198 | executables) or the instruction at "start" for statically linked | |
2199 | executables. For dynamically linked executables, the system | |
2200 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
2201 | and starts it running. The dynamic linker maps in any needed | |
2202 | shared libraries, maps in the actual user executable, and then | |
2203 | jumps to "start" in the user executable. | |
2204 | ||
7f86f058 PA |
2205 | We can arrange to cooperate with the dynamic linker to discover the |
2206 | names of shared libraries that are dynamically linked, and the base | |
2207 | addresses to which they are linked. | |
13437d4b KB |
2208 | |
2209 | This function is responsible for discovering those names and | |
2210 | addresses, and saving sufficient information about them to allow | |
d2e5c99a | 2211 | their symbols to be read at a later time. */ |
13437d4b | 2212 | |
e2a44558 | 2213 | static void |
268a4a75 | 2214 | svr4_solib_create_inferior_hook (int from_tty) |
13437d4b | 2215 | { |
1a816a87 PA |
2216 | struct svr4_info *info; |
2217 | ||
6c95b8df | 2218 | info = get_svr4_info (); |
2020b7ab | 2219 | |
e2a44558 | 2220 | /* Relocate the main executable if necessary. */ |
86e4bafc | 2221 | svr4_relocate_main_executable (); |
e2a44558 | 2222 | |
c91c8c16 PA |
2223 | /* No point setting a breakpoint in the dynamic linker if we can't |
2224 | hit it (e.g., a core file, or a trace file). */ | |
2225 | if (!target_has_execution) | |
2226 | return; | |
2227 | ||
d5a921c9 | 2228 | if (!svr4_have_link_map_offsets ()) |
513f5903 | 2229 | return; |
d5a921c9 | 2230 | |
268a4a75 | 2231 | if (!enable_break (info, from_tty)) |
542c95c2 | 2232 | return; |
13437d4b KB |
2233 | } |
2234 | ||
2235 | static void | |
2236 | svr4_clear_solib (void) | |
2237 | { | |
6c95b8df PA |
2238 | struct svr4_info *info; |
2239 | ||
2240 | info = get_svr4_info (); | |
2241 | info->debug_base = 0; | |
2242 | info->debug_loader_offset_p = 0; | |
2243 | info->debug_loader_offset = 0; | |
2244 | xfree (info->debug_loader_name); | |
2245 | info->debug_loader_name = NULL; | |
13437d4b KB |
2246 | } |
2247 | ||
6bb7be43 JB |
2248 | /* Clear any bits of ADDR that wouldn't fit in a target-format |
2249 | data pointer. "Data pointer" here refers to whatever sort of | |
2250 | address the dynamic linker uses to manage its sections. At the | |
2251 | moment, we don't support shared libraries on any processors where | |
2252 | code and data pointers are different sizes. | |
2253 | ||
2254 | This isn't really the right solution. What we really need here is | |
2255 | a way to do arithmetic on CORE_ADDR values that respects the | |
2256 | natural pointer/address correspondence. (For example, on the MIPS, | |
2257 | converting a 32-bit pointer to a 64-bit CORE_ADDR requires you to | |
2258 | sign-extend the value. There, simply truncating the bits above | |
819844ad | 2259 | gdbarch_ptr_bit, as we do below, is no good.) This should probably |
6bb7be43 JB |
2260 | be a new gdbarch method or something. */ |
2261 | static CORE_ADDR | |
2262 | svr4_truncate_ptr (CORE_ADDR addr) | |
2263 | { | |
f5656ead | 2264 | if (gdbarch_ptr_bit (target_gdbarch ()) == sizeof (CORE_ADDR) * 8) |
6bb7be43 JB |
2265 | /* We don't need to truncate anything, and the bit twiddling below |
2266 | will fail due to overflow problems. */ | |
2267 | return addr; | |
2268 | else | |
f5656ead | 2269 | return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch ())) - 1); |
6bb7be43 JB |
2270 | } |
2271 | ||
2272 | ||
749499cb KB |
2273 | static void |
2274 | svr4_relocate_section_addresses (struct so_list *so, | |
0542c86d | 2275 | struct target_section *sec) |
749499cb | 2276 | { |
b23518f0 | 2277 | sec->addr = svr4_truncate_ptr (sec->addr + lm_addr_check (so, |
cc10cae3 | 2278 | sec->bfd)); |
b23518f0 | 2279 | sec->endaddr = svr4_truncate_ptr (sec->endaddr + lm_addr_check (so, |
cc10cae3 | 2280 | sec->bfd)); |
749499cb | 2281 | } |
4b188b9f | 2282 | \f |
749499cb | 2283 | |
4b188b9f | 2284 | /* Architecture-specific operations. */ |
6bb7be43 | 2285 | |
4b188b9f MK |
2286 | /* Per-architecture data key. */ |
2287 | static struct gdbarch_data *solib_svr4_data; | |
e5e2b9ff | 2288 | |
4b188b9f | 2289 | struct solib_svr4_ops |
e5e2b9ff | 2290 | { |
4b188b9f MK |
2291 | /* Return a description of the layout of `struct link_map'. */ |
2292 | struct link_map_offsets *(*fetch_link_map_offsets)(void); | |
2293 | }; | |
e5e2b9ff | 2294 | |
4b188b9f | 2295 | /* Return a default for the architecture-specific operations. */ |
e5e2b9ff | 2296 | |
4b188b9f MK |
2297 | static void * |
2298 | solib_svr4_init (struct obstack *obstack) | |
e5e2b9ff | 2299 | { |
4b188b9f | 2300 | struct solib_svr4_ops *ops; |
e5e2b9ff | 2301 | |
4b188b9f | 2302 | ops = OBSTACK_ZALLOC (obstack, struct solib_svr4_ops); |
8d005789 | 2303 | ops->fetch_link_map_offsets = NULL; |
4b188b9f | 2304 | return ops; |
e5e2b9ff KB |
2305 | } |
2306 | ||
4b188b9f | 2307 | /* Set the architecture-specific `struct link_map_offsets' fetcher for |
7e3cb44c | 2308 | GDBARCH to FLMO. Also, install SVR4 solib_ops into GDBARCH. */ |
1c4dcb57 | 2309 | |
21479ded | 2310 | void |
e5e2b9ff KB |
2311 | set_solib_svr4_fetch_link_map_offsets (struct gdbarch *gdbarch, |
2312 | struct link_map_offsets *(*flmo) (void)) | |
21479ded | 2313 | { |
4b188b9f MK |
2314 | struct solib_svr4_ops *ops = gdbarch_data (gdbarch, solib_svr4_data); |
2315 | ||
2316 | ops->fetch_link_map_offsets = flmo; | |
7e3cb44c UW |
2317 | |
2318 | set_solib_ops (gdbarch, &svr4_so_ops); | |
21479ded KB |
2319 | } |
2320 | ||
4b188b9f MK |
2321 | /* Fetch a link_map_offsets structure using the architecture-specific |
2322 | `struct link_map_offsets' fetcher. */ | |
1c4dcb57 | 2323 | |
4b188b9f MK |
2324 | static struct link_map_offsets * |
2325 | svr4_fetch_link_map_offsets (void) | |
21479ded | 2326 | { |
f5656ead | 2327 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch (), solib_svr4_data); |
4b188b9f MK |
2328 | |
2329 | gdb_assert (ops->fetch_link_map_offsets); | |
2330 | return ops->fetch_link_map_offsets (); | |
21479ded KB |
2331 | } |
2332 | ||
4b188b9f MK |
2333 | /* Return 1 if a link map offset fetcher has been defined, 0 otherwise. */ |
2334 | ||
2335 | static int | |
2336 | svr4_have_link_map_offsets (void) | |
2337 | { | |
f5656ead | 2338 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch (), solib_svr4_data); |
433759f7 | 2339 | |
4b188b9f MK |
2340 | return (ops->fetch_link_map_offsets != NULL); |
2341 | } | |
2342 | \f | |
2343 | ||
e4bbbda8 MK |
2344 | /* Most OS'es that have SVR4-style ELF dynamic libraries define a |
2345 | `struct r_debug' and a `struct link_map' that are binary compatible | |
2346 | with the origional SVR4 implementation. */ | |
2347 | ||
2348 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
2349 | for an ILP32 SVR4 system. */ | |
d989b283 | 2350 | |
e4bbbda8 MK |
2351 | struct link_map_offsets * |
2352 | svr4_ilp32_fetch_link_map_offsets (void) | |
2353 | { | |
2354 | static struct link_map_offsets lmo; | |
2355 | static struct link_map_offsets *lmp = NULL; | |
2356 | ||
2357 | if (lmp == NULL) | |
2358 | { | |
2359 | lmp = &lmo; | |
2360 | ||
e4cd0d6a MK |
2361 | lmo.r_version_offset = 0; |
2362 | lmo.r_version_size = 4; | |
e4bbbda8 | 2363 | lmo.r_map_offset = 4; |
7cd25cfc | 2364 | lmo.r_brk_offset = 8; |
e4cd0d6a | 2365 | lmo.r_ldsomap_offset = 20; |
e4bbbda8 MK |
2366 | |
2367 | /* Everything we need is in the first 20 bytes. */ | |
2368 | lmo.link_map_size = 20; | |
2369 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 2370 | lmo.l_name_offset = 4; |
cc10cae3 | 2371 | lmo.l_ld_offset = 8; |
e4bbbda8 | 2372 | lmo.l_next_offset = 12; |
e4bbbda8 | 2373 | lmo.l_prev_offset = 16; |
e4bbbda8 MK |
2374 | } |
2375 | ||
2376 | return lmp; | |
2377 | } | |
2378 | ||
2379 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
2380 | for an LP64 SVR4 system. */ | |
d989b283 | 2381 | |
e4bbbda8 MK |
2382 | struct link_map_offsets * |
2383 | svr4_lp64_fetch_link_map_offsets (void) | |
2384 | { | |
2385 | static struct link_map_offsets lmo; | |
2386 | static struct link_map_offsets *lmp = NULL; | |
2387 | ||
2388 | if (lmp == NULL) | |
2389 | { | |
2390 | lmp = &lmo; | |
2391 | ||
e4cd0d6a MK |
2392 | lmo.r_version_offset = 0; |
2393 | lmo.r_version_size = 4; | |
e4bbbda8 | 2394 | lmo.r_map_offset = 8; |
7cd25cfc | 2395 | lmo.r_brk_offset = 16; |
e4cd0d6a | 2396 | lmo.r_ldsomap_offset = 40; |
e4bbbda8 MK |
2397 | |
2398 | /* Everything we need is in the first 40 bytes. */ | |
2399 | lmo.link_map_size = 40; | |
2400 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 2401 | lmo.l_name_offset = 8; |
cc10cae3 | 2402 | lmo.l_ld_offset = 16; |
e4bbbda8 | 2403 | lmo.l_next_offset = 24; |
e4bbbda8 | 2404 | lmo.l_prev_offset = 32; |
e4bbbda8 MK |
2405 | } |
2406 | ||
2407 | return lmp; | |
2408 | } | |
2409 | \f | |
2410 | ||
7d522c90 | 2411 | struct target_so_ops svr4_so_ops; |
13437d4b | 2412 | |
c378eb4e | 2413 | /* Lookup global symbol for ELF DSOs linked with -Bsymbolic. Those DSOs have a |
3a40aaa0 UW |
2414 | different rule for symbol lookup. The lookup begins here in the DSO, not in |
2415 | the main executable. */ | |
2416 | ||
2417 | static struct symbol * | |
2418 | elf_lookup_lib_symbol (const struct objfile *objfile, | |
2419 | const char *name, | |
21b556f4 | 2420 | const domain_enum domain) |
3a40aaa0 | 2421 | { |
61f0d762 JK |
2422 | bfd *abfd; |
2423 | ||
2424 | if (objfile == symfile_objfile) | |
2425 | abfd = exec_bfd; | |
2426 | else | |
2427 | { | |
2428 | /* OBJFILE should have been passed as the non-debug one. */ | |
2429 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
2430 | ||
2431 | abfd = objfile->obfd; | |
2432 | } | |
2433 | ||
2434 | if (abfd == NULL || scan_dyntag (DT_SYMBOLIC, abfd, NULL) != 1) | |
3a40aaa0 UW |
2435 | return NULL; |
2436 | ||
94af9270 | 2437 | return lookup_global_symbol_from_objfile (objfile, name, domain); |
3a40aaa0 UW |
2438 | } |
2439 | ||
a78f21af AC |
2440 | extern initialize_file_ftype _initialize_svr4_solib; /* -Wmissing-prototypes */ |
2441 | ||
13437d4b KB |
2442 | void |
2443 | _initialize_svr4_solib (void) | |
2444 | { | |
4b188b9f | 2445 | solib_svr4_data = gdbarch_data_register_pre_init (solib_svr4_init); |
6c95b8df | 2446 | solib_svr4_pspace_data |
8e260fc0 | 2447 | = register_program_space_data_with_cleanup (NULL, svr4_pspace_data_cleanup); |
4b188b9f | 2448 | |
749499cb | 2449 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b KB |
2450 | svr4_so_ops.free_so = svr4_free_so; |
2451 | svr4_so_ops.clear_solib = svr4_clear_solib; | |
2452 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
2453 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |
2454 | svr4_so_ops.current_sos = svr4_current_sos; | |
2455 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
d7fa2ae2 | 2456 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; |
831a0c44 | 2457 | svr4_so_ops.bfd_open = solib_bfd_open; |
3a40aaa0 | 2458 | svr4_so_ops.lookup_lib_global_symbol = elf_lookup_lib_symbol; |
a7c02bc8 | 2459 | svr4_so_ops.same = svr4_same; |
de18c1d8 | 2460 | svr4_so_ops.keep_data_in_core = svr4_keep_data_in_core; |
13437d4b | 2461 | } |