Commit | Line | Data |
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ab31aa69 | 1 | /* Handle SVR4 shared libraries for GDB, the GNU Debugger. |
2f4950cd | 2 | |
6aba47ca | 3 | Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, |
4c38e0a4 | 4 | 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
0fb0cc75 | 5 | Free Software Foundation, Inc. |
13437d4b KB |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
13437d4b KB |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
13437d4b | 21 | |
13437d4b KB |
22 | #include "defs.h" |
23 | ||
13437d4b | 24 | #include "elf/external.h" |
21479ded | 25 | #include "elf/common.h" |
f7856c8f | 26 | #include "elf/mips.h" |
13437d4b KB |
27 | |
28 | #include "symtab.h" | |
29 | #include "bfd.h" | |
30 | #include "symfile.h" | |
31 | #include "objfiles.h" | |
32 | #include "gdbcore.h" | |
13437d4b | 33 | #include "target.h" |
13437d4b | 34 | #include "inferior.h" |
fb14de7b | 35 | #include "regcache.h" |
2020b7ab | 36 | #include "gdbthread.h" |
1a816a87 | 37 | #include "observer.h" |
13437d4b | 38 | |
4b188b9f MK |
39 | #include "gdb_assert.h" |
40 | ||
13437d4b | 41 | #include "solist.h" |
bba93f6c | 42 | #include "solib.h" |
13437d4b KB |
43 | #include "solib-svr4.h" |
44 | ||
2f4950cd | 45 | #include "bfd-target.h" |
cc10cae3 | 46 | #include "elf-bfd.h" |
2f4950cd | 47 | #include "exec.h" |
8d4e36ba | 48 | #include "auxv.h" |
f1838a98 | 49 | #include "exceptions.h" |
2f4950cd | 50 | |
e5e2b9ff | 51 | static struct link_map_offsets *svr4_fetch_link_map_offsets (void); |
d5a921c9 | 52 | static int svr4_have_link_map_offsets (void); |
9f2982ff | 53 | static void svr4_relocate_main_executable (void); |
1c4dcb57 | 54 | |
13437d4b KB |
55 | /* Link map info to include in an allocated so_list entry */ |
56 | ||
57 | struct lm_info | |
58 | { | |
59 | /* Pointer to copy of link map from inferior. The type is char * | |
60 | rather than void *, so that we may use byte offsets to find the | |
61 | various fields without the need for a cast. */ | |
4066fc10 | 62 | gdb_byte *lm; |
cc10cae3 AO |
63 | |
64 | /* Amount by which addresses in the binary should be relocated to | |
65 | match the inferior. This could most often be taken directly | |
66 | from lm, but when prelinking is involved and the prelink base | |
67 | address changes, we may need a different offset, we want to | |
68 | warn about the difference and compute it only once. */ | |
69 | CORE_ADDR l_addr; | |
93a57060 DJ |
70 | |
71 | /* The target location of lm. */ | |
72 | CORE_ADDR lm_addr; | |
13437d4b KB |
73 | }; |
74 | ||
75 | /* On SVR4 systems, a list of symbols in the dynamic linker where | |
76 | GDB can try to place a breakpoint to monitor shared library | |
77 | events. | |
78 | ||
79 | If none of these symbols are found, or other errors occur, then | |
80 | SVR4 systems will fall back to using a symbol as the "startup | |
81 | mapping complete" breakpoint address. */ | |
82 | ||
13437d4b KB |
83 | static char *solib_break_names[] = |
84 | { | |
85 | "r_debug_state", | |
86 | "_r_debug_state", | |
87 | "_dl_debug_state", | |
88 | "rtld_db_dlactivity", | |
4c7dcb84 | 89 | "__dl_rtld_db_dlactivity", |
1f72e589 | 90 | "_rtld_debug_state", |
4c0122c8 | 91 | |
13437d4b KB |
92 | NULL |
93 | }; | |
13437d4b | 94 | |
13437d4b KB |
95 | static char *bkpt_names[] = |
96 | { | |
13437d4b | 97 | "_start", |
ad3dcc5c | 98 | "__start", |
13437d4b KB |
99 | "main", |
100 | NULL | |
101 | }; | |
13437d4b | 102 | |
13437d4b KB |
103 | static char *main_name_list[] = |
104 | { | |
105 | "main_$main", | |
106 | NULL | |
107 | }; | |
108 | ||
4d7b2d5b JB |
109 | /* Return non-zero if GDB_SO_NAME and INFERIOR_SO_NAME represent |
110 | the same shared library. */ | |
111 | ||
112 | static int | |
113 | svr4_same_1 (const char *gdb_so_name, const char *inferior_so_name) | |
114 | { | |
115 | if (strcmp (gdb_so_name, inferior_so_name) == 0) | |
116 | return 1; | |
117 | ||
118 | /* On Solaris, when starting inferior we think that dynamic linker is | |
119 | /usr/lib/ld.so.1, but later on, the table of loaded shared libraries | |
120 | contains /lib/ld.so.1. Sometimes one file is a link to another, but | |
121 | sometimes they have identical content, but are not linked to each | |
122 | other. We don't restrict this check for Solaris, but the chances | |
123 | of running into this situation elsewhere are very low. */ | |
124 | if (strcmp (gdb_so_name, "/usr/lib/ld.so.1") == 0 | |
125 | && strcmp (inferior_so_name, "/lib/ld.so.1") == 0) | |
126 | return 1; | |
127 | ||
128 | /* Similarly, we observed the same issue with sparc64, but with | |
129 | different locations. */ | |
130 | if (strcmp (gdb_so_name, "/usr/lib/sparcv9/ld.so.1") == 0 | |
131 | && strcmp (inferior_so_name, "/lib/sparcv9/ld.so.1") == 0) | |
132 | return 1; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int | |
138 | svr4_same (struct so_list *gdb, struct so_list *inferior) | |
139 | { | |
140 | return (svr4_same_1 (gdb->so_original_name, inferior->so_original_name)); | |
141 | } | |
142 | ||
13437d4b KB |
143 | /* link map access functions */ |
144 | ||
145 | static CORE_ADDR | |
cc10cae3 | 146 | LM_ADDR_FROM_LINK_MAP (struct so_list *so) |
13437d4b | 147 | { |
4b188b9f | 148 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 149 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 150 | |
cfaefc65 | 151 | return extract_typed_address (so->lm_info->lm + lmo->l_addr_offset, |
b6da22b0 | 152 | ptr_type); |
13437d4b KB |
153 | } |
154 | ||
cc10cae3 | 155 | static int |
2c0b251b | 156 | HAS_LM_DYNAMIC_FROM_LINK_MAP (void) |
cc10cae3 AO |
157 | { |
158 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
159 | ||
cfaefc65 | 160 | return lmo->l_ld_offset >= 0; |
cc10cae3 AO |
161 | } |
162 | ||
163 | static CORE_ADDR | |
164 | LM_DYNAMIC_FROM_LINK_MAP (struct so_list *so) | |
165 | { | |
166 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 167 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
cc10cae3 | 168 | |
cfaefc65 | 169 | return extract_typed_address (so->lm_info->lm + lmo->l_ld_offset, |
b6da22b0 | 170 | ptr_type); |
cc10cae3 AO |
171 | } |
172 | ||
173 | static CORE_ADDR | |
174 | LM_ADDR_CHECK (struct so_list *so, bfd *abfd) | |
175 | { | |
176 | if (so->lm_info->l_addr == (CORE_ADDR)-1) | |
177 | { | |
178 | struct bfd_section *dyninfo_sect; | |
28f34a8f | 179 | CORE_ADDR l_addr, l_dynaddr, dynaddr; |
cc10cae3 AO |
180 | |
181 | l_addr = LM_ADDR_FROM_LINK_MAP (so); | |
182 | ||
183 | if (! abfd || ! HAS_LM_DYNAMIC_FROM_LINK_MAP ()) | |
184 | goto set_addr; | |
185 | ||
186 | l_dynaddr = LM_DYNAMIC_FROM_LINK_MAP (so); | |
187 | ||
188 | dyninfo_sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
189 | if (dyninfo_sect == NULL) | |
190 | goto set_addr; | |
191 | ||
192 | dynaddr = bfd_section_vma (abfd, dyninfo_sect); | |
193 | ||
194 | if (dynaddr + l_addr != l_dynaddr) | |
195 | { | |
28f34a8f | 196 | CORE_ADDR align = 0x1000; |
4e1fc9c9 | 197 | CORE_ADDR minpagesize = align; |
28f34a8f | 198 | |
cc10cae3 AO |
199 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
200 | { | |
201 | Elf_Internal_Ehdr *ehdr = elf_tdata (abfd)->elf_header; | |
202 | Elf_Internal_Phdr *phdr = elf_tdata (abfd)->phdr; | |
203 | int i; | |
204 | ||
205 | align = 1; | |
206 | ||
207 | for (i = 0; i < ehdr->e_phnum; i++) | |
208 | if (phdr[i].p_type == PT_LOAD && phdr[i].p_align > align) | |
209 | align = phdr[i].p_align; | |
4e1fc9c9 JK |
210 | |
211 | minpagesize = get_elf_backend_data (abfd)->minpagesize; | |
cc10cae3 AO |
212 | } |
213 | ||
214 | /* Turn it into a mask. */ | |
215 | align--; | |
216 | ||
217 | /* If the changes match the alignment requirements, we | |
218 | assume we're using a core file that was generated by the | |
219 | same binary, just prelinked with a different base offset. | |
220 | If it doesn't match, we may have a different binary, the | |
221 | same binary with the dynamic table loaded at an unrelated | |
222 | location, or anything, really. To avoid regressions, | |
223 | don't adjust the base offset in the latter case, although | |
224 | odds are that, if things really changed, debugging won't | |
5c0d192f JK |
225 | quite work. |
226 | ||
227 | One could expect more the condition | |
228 | ((l_addr & align) == 0 && ((l_dynaddr - dynaddr) & align) == 0) | |
229 | but the one below is relaxed for PPC. The PPC kernel supports | |
230 | either 4k or 64k page sizes. To be prepared for 64k pages, | |
231 | PPC ELF files are built using an alignment requirement of 64k. | |
232 | However, when running on a kernel supporting 4k pages, the memory | |
233 | mapping of the library may not actually happen on a 64k boundary! | |
234 | ||
235 | (In the usual case where (l_addr & align) == 0, this check is | |
4e1fc9c9 JK |
236 | equivalent to the possibly expected check above.) |
237 | ||
238 | Even on PPC it must be zero-aligned at least for MINPAGESIZE. */ | |
5c0d192f | 239 | |
4e1fc9c9 JK |
240 | if ((l_addr & (minpagesize - 1)) == 0 |
241 | && (l_addr & align) == ((l_dynaddr - dynaddr) & align)) | |
cc10cae3 AO |
242 | { |
243 | l_addr = l_dynaddr - dynaddr; | |
79d4c408 | 244 | |
701ed6dc | 245 | if (info_verbose) |
ccf26247 JK |
246 | printf_unfiltered (_("Using PIC (Position Independent Code) " |
247 | "prelink displacement %s for \"%s\".\n"), | |
248 | paddress (target_gdbarch, l_addr), | |
249 | so->so_name); | |
cc10cae3 | 250 | } |
79d4c408 DJ |
251 | else |
252 | warning (_(".dynamic section for \"%s\" " | |
253 | "is not at the expected address " | |
254 | "(wrong library or version mismatch?)"), so->so_name); | |
cc10cae3 AO |
255 | } |
256 | ||
257 | set_addr: | |
258 | so->lm_info->l_addr = l_addr; | |
259 | } | |
260 | ||
261 | return so->lm_info->l_addr; | |
262 | } | |
263 | ||
13437d4b KB |
264 | static CORE_ADDR |
265 | LM_NEXT (struct so_list *so) | |
266 | { | |
4b188b9f | 267 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 268 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 269 | |
cfaefc65 | 270 | return extract_typed_address (so->lm_info->lm + lmo->l_next_offset, |
b6da22b0 | 271 | ptr_type); |
13437d4b KB |
272 | } |
273 | ||
492928e4 JK |
274 | static CORE_ADDR |
275 | LM_PREV (struct so_list *so) | |
276 | { | |
277 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
278 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; | |
279 | ||
280 | return extract_typed_address (so->lm_info->lm + lmo->l_prev_offset, | |
281 | ptr_type); | |
282 | } | |
283 | ||
13437d4b KB |
284 | static CORE_ADDR |
285 | LM_NAME (struct so_list *so) | |
286 | { | |
4b188b9f | 287 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 288 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
13437d4b | 289 | |
cfaefc65 | 290 | return extract_typed_address (so->lm_info->lm + lmo->l_name_offset, |
b6da22b0 | 291 | ptr_type); |
13437d4b KB |
292 | } |
293 | ||
13437d4b KB |
294 | static int |
295 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
296 | { | |
e499d0f1 DJ |
297 | /* Assume that everything is a library if the dynamic loader was loaded |
298 | late by a static executable. */ | |
0763ab81 | 299 | if (exec_bfd && bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL) |
e499d0f1 DJ |
300 | return 0; |
301 | ||
492928e4 | 302 | return LM_PREV (so) == 0; |
13437d4b KB |
303 | } |
304 | ||
6c95b8df | 305 | /* Per pspace SVR4 specific data. */ |
13437d4b | 306 | |
1a816a87 PA |
307 | struct svr4_info |
308 | { | |
1a816a87 PA |
309 | CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
310 | ||
311 | /* Validity flag for debug_loader_offset. */ | |
312 | int debug_loader_offset_p; | |
313 | ||
314 | /* Load address for the dynamic linker, inferred. */ | |
315 | CORE_ADDR debug_loader_offset; | |
316 | ||
317 | /* Name of the dynamic linker, valid if debug_loader_offset_p. */ | |
318 | char *debug_loader_name; | |
319 | ||
320 | /* Load map address for the main executable. */ | |
321 | CORE_ADDR main_lm_addr; | |
1a816a87 | 322 | |
6c95b8df PA |
323 | CORE_ADDR interp_text_sect_low; |
324 | CORE_ADDR interp_text_sect_high; | |
325 | CORE_ADDR interp_plt_sect_low; | |
326 | CORE_ADDR interp_plt_sect_high; | |
327 | }; | |
1a816a87 | 328 | |
6c95b8df PA |
329 | /* Per-program-space data key. */ |
330 | static const struct program_space_data *solib_svr4_pspace_data; | |
1a816a87 | 331 | |
6c95b8df PA |
332 | static void |
333 | svr4_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
1a816a87 | 334 | { |
6c95b8df | 335 | struct svr4_info *info; |
1a816a87 | 336 | |
6c95b8df PA |
337 | info = program_space_data (pspace, solib_svr4_pspace_data); |
338 | xfree (info); | |
1a816a87 PA |
339 | } |
340 | ||
6c95b8df PA |
341 | /* Get the current svr4 data. If none is found yet, add it now. This |
342 | function always returns a valid object. */ | |
34439770 | 343 | |
6c95b8df PA |
344 | static struct svr4_info * |
345 | get_svr4_info (void) | |
1a816a87 | 346 | { |
6c95b8df | 347 | struct svr4_info *info; |
1a816a87 | 348 | |
6c95b8df PA |
349 | info = program_space_data (current_program_space, solib_svr4_pspace_data); |
350 | if (info != NULL) | |
351 | return info; | |
34439770 | 352 | |
6c95b8df PA |
353 | info = XZALLOC (struct svr4_info); |
354 | set_program_space_data (current_program_space, solib_svr4_pspace_data, info); | |
355 | return info; | |
1a816a87 | 356 | } |
93a57060 | 357 | |
13437d4b KB |
358 | /* Local function prototypes */ |
359 | ||
360 | static int match_main (char *); | |
361 | ||
2bbe3cc1 | 362 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *); |
13437d4b KB |
363 | |
364 | /* | |
365 | ||
366 | LOCAL FUNCTION | |
367 | ||
368 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
369 | ||
370 | SYNOPSIS | |
371 | ||
2bbe3cc1 | 372 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) |
13437d4b KB |
373 | |
374 | DESCRIPTION | |
375 | ||
376 | An expensive way to lookup the value of a single symbol for | |
377 | bfd's that are only temporary anyway. This is used by the | |
378 | shared library support to find the address of the debugger | |
2bbe3cc1 | 379 | notification routine in the shared library. |
13437d4b | 380 | |
2bbe3cc1 DJ |
381 | The returned symbol may be in a code or data section; functions |
382 | will normally be in a code section, but may be in a data section | |
383 | if this architecture uses function descriptors. | |
87f84c9d | 384 | |
13437d4b KB |
385 | Note that 0 is specifically allowed as an error return (no |
386 | such symbol). | |
387 | */ | |
388 | ||
389 | static CORE_ADDR | |
2bbe3cc1 | 390 | bfd_lookup_symbol (bfd *abfd, char *symname) |
13437d4b | 391 | { |
435b259c | 392 | long storage_needed; |
13437d4b KB |
393 | asymbol *sym; |
394 | asymbol **symbol_table; | |
395 | unsigned int number_of_symbols; | |
396 | unsigned int i; | |
397 | struct cleanup *back_to; | |
398 | CORE_ADDR symaddr = 0; | |
399 | ||
400 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
401 | ||
402 | if (storage_needed > 0) | |
403 | { | |
404 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 405 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
406 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
407 | ||
408 | for (i = 0; i < number_of_symbols; i++) | |
409 | { | |
410 | sym = *symbol_table++; | |
6314a349 | 411 | if (strcmp (sym->name, symname) == 0 |
2bbe3cc1 | 412 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) |
13437d4b | 413 | { |
2bbe3cc1 | 414 | /* BFD symbols are section relative. */ |
13437d4b KB |
415 | symaddr = sym->value + sym->section->vma; |
416 | break; | |
417 | } | |
418 | } | |
419 | do_cleanups (back_to); | |
420 | } | |
421 | ||
422 | if (symaddr) | |
423 | return symaddr; | |
424 | ||
425 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll | |
426 | have to check the dynamic string table too. */ | |
427 | ||
428 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
429 | ||
430 | if (storage_needed > 0) | |
431 | { | |
432 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 433 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
434 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table); |
435 | ||
436 | for (i = 0; i < number_of_symbols; i++) | |
437 | { | |
438 | sym = *symbol_table++; | |
87f84c9d | 439 | |
6314a349 | 440 | if (strcmp (sym->name, symname) == 0 |
2bbe3cc1 | 441 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) |
13437d4b | 442 | { |
2bbe3cc1 | 443 | /* BFD symbols are section relative. */ |
13437d4b KB |
444 | symaddr = sym->value + sym->section->vma; |
445 | break; | |
446 | } | |
447 | } | |
448 | do_cleanups (back_to); | |
449 | } | |
450 | ||
451 | return symaddr; | |
452 | } | |
453 | ||
97ec2c2f UW |
454 | |
455 | /* Read program header TYPE from inferior memory. The header is found | |
456 | by scanning the OS auxillary vector. | |
457 | ||
09919ac2 JK |
458 | If TYPE == -1, return the program headers instead of the contents of |
459 | one program header. | |
460 | ||
97ec2c2f UW |
461 | Return a pointer to allocated memory holding the program header contents, |
462 | or NULL on failure. If sucessful, and unless P_SECT_SIZE is NULL, the | |
463 | size of those contents is returned to P_SECT_SIZE. Likewise, the target | |
464 | architecture size (32-bit or 64-bit) is returned to P_ARCH_SIZE. */ | |
465 | ||
466 | static gdb_byte * | |
467 | read_program_header (int type, int *p_sect_size, int *p_arch_size) | |
468 | { | |
e17a4113 | 469 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
97ec2c2f UW |
470 | CORE_ADDR at_phdr, at_phent, at_phnum; |
471 | int arch_size, sect_size; | |
472 | CORE_ADDR sect_addr; | |
473 | gdb_byte *buf; | |
474 | ||
475 | /* Get required auxv elements from target. */ | |
476 | if (target_auxv_search (¤t_target, AT_PHDR, &at_phdr) <= 0) | |
477 | return 0; | |
478 | if (target_auxv_search (¤t_target, AT_PHENT, &at_phent) <= 0) | |
479 | return 0; | |
480 | if (target_auxv_search (¤t_target, AT_PHNUM, &at_phnum) <= 0) | |
481 | return 0; | |
482 | if (!at_phdr || !at_phnum) | |
483 | return 0; | |
484 | ||
485 | /* Determine ELF architecture type. */ | |
486 | if (at_phent == sizeof (Elf32_External_Phdr)) | |
487 | arch_size = 32; | |
488 | else if (at_phent == sizeof (Elf64_External_Phdr)) | |
489 | arch_size = 64; | |
490 | else | |
491 | return 0; | |
492 | ||
09919ac2 JK |
493 | /* Find the requested segment. */ |
494 | if (type == -1) | |
495 | { | |
496 | sect_addr = at_phdr; | |
497 | sect_size = at_phent * at_phnum; | |
498 | } | |
499 | else if (arch_size == 32) | |
97ec2c2f UW |
500 | { |
501 | Elf32_External_Phdr phdr; | |
502 | int i; | |
503 | ||
504 | /* Search for requested PHDR. */ | |
505 | for (i = 0; i < at_phnum; i++) | |
506 | { | |
507 | if (target_read_memory (at_phdr + i * sizeof (phdr), | |
508 | (gdb_byte *)&phdr, sizeof (phdr))) | |
509 | return 0; | |
510 | ||
e17a4113 UW |
511 | if (extract_unsigned_integer ((gdb_byte *)phdr.p_type, |
512 | 4, byte_order) == type) | |
97ec2c2f UW |
513 | break; |
514 | } | |
515 | ||
516 | if (i == at_phnum) | |
517 | return 0; | |
518 | ||
519 | /* Retrieve address and size. */ | |
e17a4113 UW |
520 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
521 | 4, byte_order); | |
522 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
523 | 4, byte_order); | |
97ec2c2f UW |
524 | } |
525 | else | |
526 | { | |
527 | Elf64_External_Phdr phdr; | |
528 | int i; | |
529 | ||
530 | /* Search for requested PHDR. */ | |
531 | for (i = 0; i < at_phnum; i++) | |
532 | { | |
533 | if (target_read_memory (at_phdr + i * sizeof (phdr), | |
534 | (gdb_byte *)&phdr, sizeof (phdr))) | |
535 | return 0; | |
536 | ||
e17a4113 UW |
537 | if (extract_unsigned_integer ((gdb_byte *)phdr.p_type, |
538 | 4, byte_order) == type) | |
97ec2c2f UW |
539 | break; |
540 | } | |
541 | ||
542 | if (i == at_phnum) | |
543 | return 0; | |
544 | ||
545 | /* Retrieve address and size. */ | |
e17a4113 UW |
546 | sect_addr = extract_unsigned_integer ((gdb_byte *)phdr.p_vaddr, |
547 | 8, byte_order); | |
548 | sect_size = extract_unsigned_integer ((gdb_byte *)phdr.p_memsz, | |
549 | 8, byte_order); | |
97ec2c2f UW |
550 | } |
551 | ||
552 | /* Read in requested program header. */ | |
553 | buf = xmalloc (sect_size); | |
554 | if (target_read_memory (sect_addr, buf, sect_size)) | |
555 | { | |
556 | xfree (buf); | |
557 | return NULL; | |
558 | } | |
559 | ||
560 | if (p_arch_size) | |
561 | *p_arch_size = arch_size; | |
562 | if (p_sect_size) | |
563 | *p_sect_size = sect_size; | |
564 | ||
565 | return buf; | |
566 | } | |
567 | ||
568 | ||
569 | /* Return program interpreter string. */ | |
570 | static gdb_byte * | |
571 | find_program_interpreter (void) | |
572 | { | |
573 | gdb_byte *buf = NULL; | |
574 | ||
575 | /* If we have an exec_bfd, use its section table. */ | |
576 | if (exec_bfd | |
577 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
578 | { | |
579 | struct bfd_section *interp_sect; | |
580 | ||
581 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
582 | if (interp_sect != NULL) | |
583 | { | |
584 | CORE_ADDR sect_addr = bfd_section_vma (exec_bfd, interp_sect); | |
585 | int sect_size = bfd_section_size (exec_bfd, interp_sect); | |
586 | ||
587 | buf = xmalloc (sect_size); | |
588 | bfd_get_section_contents (exec_bfd, interp_sect, buf, 0, sect_size); | |
589 | } | |
590 | } | |
591 | ||
592 | /* If we didn't find it, use the target auxillary vector. */ | |
593 | if (!buf) | |
594 | buf = read_program_header (PT_INTERP, NULL, NULL); | |
595 | ||
596 | return buf; | |
597 | } | |
598 | ||
599 | ||
3a40aaa0 UW |
600 | /* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is |
601 | returned and the corresponding PTR is set. */ | |
602 | ||
603 | static int | |
604 | scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr) | |
605 | { | |
606 | int arch_size, step, sect_size; | |
607 | long dyn_tag; | |
b381ea14 | 608 | CORE_ADDR dyn_ptr, dyn_addr; |
65728c26 | 609 | gdb_byte *bufend, *bufstart, *buf; |
3a40aaa0 UW |
610 | Elf32_External_Dyn *x_dynp_32; |
611 | Elf64_External_Dyn *x_dynp_64; | |
612 | struct bfd_section *sect; | |
61f0d762 | 613 | struct target_section *target_section; |
3a40aaa0 UW |
614 | |
615 | if (abfd == NULL) | |
616 | return 0; | |
0763ab81 PA |
617 | |
618 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
619 | return 0; | |
620 | ||
3a40aaa0 UW |
621 | arch_size = bfd_get_arch_size (abfd); |
622 | if (arch_size == -1) | |
0763ab81 | 623 | return 0; |
3a40aaa0 UW |
624 | |
625 | /* Find the start address of the .dynamic section. */ | |
626 | sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
627 | if (sect == NULL) | |
628 | return 0; | |
61f0d762 JK |
629 | |
630 | for (target_section = current_target_sections->sections; | |
631 | target_section < current_target_sections->sections_end; | |
632 | target_section++) | |
633 | if (sect == target_section->the_bfd_section) | |
634 | break; | |
b381ea14 JK |
635 | if (target_section < current_target_sections->sections_end) |
636 | dyn_addr = target_section->addr; | |
637 | else | |
638 | { | |
639 | /* ABFD may come from OBJFILE acting only as a symbol file without being | |
640 | loaded into the target (see add_symbol_file_command). This case is | |
641 | such fallback to the file VMA address without the possibility of | |
642 | having the section relocated to its actual in-memory address. */ | |
643 | ||
644 | dyn_addr = bfd_section_vma (abfd, sect); | |
645 | } | |
3a40aaa0 | 646 | |
65728c26 DJ |
647 | /* Read in .dynamic from the BFD. We will get the actual value |
648 | from memory later. */ | |
3a40aaa0 | 649 | sect_size = bfd_section_size (abfd, sect); |
65728c26 DJ |
650 | buf = bufstart = alloca (sect_size); |
651 | if (!bfd_get_section_contents (abfd, sect, | |
652 | buf, 0, sect_size)) | |
653 | return 0; | |
3a40aaa0 UW |
654 | |
655 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
656 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
657 | : sizeof (Elf64_External_Dyn); | |
658 | for (bufend = buf + sect_size; | |
659 | buf < bufend; | |
660 | buf += step) | |
661 | { | |
662 | if (arch_size == 32) | |
663 | { | |
664 | x_dynp_32 = (Elf32_External_Dyn *) buf; | |
665 | dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag); | |
666 | dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr); | |
667 | } | |
65728c26 | 668 | else |
3a40aaa0 UW |
669 | { |
670 | x_dynp_64 = (Elf64_External_Dyn *) buf; | |
671 | dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag); | |
672 | dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr); | |
673 | } | |
674 | if (dyn_tag == DT_NULL) | |
675 | return 0; | |
676 | if (dyn_tag == dyntag) | |
677 | { | |
65728c26 DJ |
678 | /* If requested, try to read the runtime value of this .dynamic |
679 | entry. */ | |
3a40aaa0 | 680 | if (ptr) |
65728c26 | 681 | { |
b6da22b0 | 682 | struct type *ptr_type; |
65728c26 DJ |
683 | gdb_byte ptr_buf[8]; |
684 | CORE_ADDR ptr_addr; | |
685 | ||
b6da22b0 | 686 | ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
b381ea14 | 687 | ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8; |
65728c26 | 688 | if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0) |
b6da22b0 | 689 | dyn_ptr = extract_typed_address (ptr_buf, ptr_type); |
65728c26 DJ |
690 | *ptr = dyn_ptr; |
691 | } | |
692 | return 1; | |
3a40aaa0 UW |
693 | } |
694 | } | |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
97ec2c2f UW |
699 | /* Scan for DYNTAG in .dynamic section of the target's main executable, |
700 | found by consulting the OS auxillary vector. If DYNTAG is found 1 is | |
701 | returned and the corresponding PTR is set. */ | |
702 | ||
703 | static int | |
704 | scan_dyntag_auxv (int dyntag, CORE_ADDR *ptr) | |
705 | { | |
e17a4113 | 706 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
97ec2c2f UW |
707 | int sect_size, arch_size, step; |
708 | long dyn_tag; | |
709 | CORE_ADDR dyn_ptr; | |
710 | gdb_byte *bufend, *bufstart, *buf; | |
711 | ||
712 | /* Read in .dynamic section. */ | |
713 | buf = bufstart = read_program_header (PT_DYNAMIC, §_size, &arch_size); | |
714 | if (!buf) | |
715 | return 0; | |
716 | ||
717 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
718 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
719 | : sizeof (Elf64_External_Dyn); | |
720 | for (bufend = buf + sect_size; | |
721 | buf < bufend; | |
722 | buf += step) | |
723 | { | |
724 | if (arch_size == 32) | |
725 | { | |
726 | Elf32_External_Dyn *dynp = (Elf32_External_Dyn *) buf; | |
e17a4113 UW |
727 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
728 | 4, byte_order); | |
729 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
730 | 4, byte_order); | |
97ec2c2f UW |
731 | } |
732 | else | |
733 | { | |
734 | Elf64_External_Dyn *dynp = (Elf64_External_Dyn *) buf; | |
e17a4113 UW |
735 | dyn_tag = extract_unsigned_integer ((gdb_byte *) dynp->d_tag, |
736 | 8, byte_order); | |
737 | dyn_ptr = extract_unsigned_integer ((gdb_byte *) dynp->d_un.d_ptr, | |
738 | 8, byte_order); | |
97ec2c2f UW |
739 | } |
740 | if (dyn_tag == DT_NULL) | |
741 | break; | |
742 | ||
743 | if (dyn_tag == dyntag) | |
744 | { | |
745 | if (ptr) | |
746 | *ptr = dyn_ptr; | |
747 | ||
748 | xfree (bufstart); | |
749 | return 1; | |
750 | } | |
751 | } | |
752 | ||
753 | xfree (bufstart); | |
754 | return 0; | |
755 | } | |
756 | ||
3a40aaa0 | 757 | |
13437d4b KB |
758 | /* |
759 | ||
760 | LOCAL FUNCTION | |
761 | ||
762 | elf_locate_base -- locate the base address of dynamic linker structs | |
763 | for SVR4 elf targets. | |
764 | ||
765 | SYNOPSIS | |
766 | ||
767 | CORE_ADDR elf_locate_base (void) | |
768 | ||
769 | DESCRIPTION | |
770 | ||
771 | For SVR4 elf targets the address of the dynamic linker's runtime | |
772 | structure is contained within the dynamic info section in the | |
773 | executable file. The dynamic section is also mapped into the | |
774 | inferior address space. Because the runtime loader fills in the | |
775 | real address before starting the inferior, we have to read in the | |
776 | dynamic info section from the inferior address space. | |
777 | If there are any errors while trying to find the address, we | |
778 | silently return 0, otherwise the found address is returned. | |
779 | ||
780 | */ | |
781 | ||
782 | static CORE_ADDR | |
783 | elf_locate_base (void) | |
784 | { | |
3a40aaa0 UW |
785 | struct minimal_symbol *msymbol; |
786 | CORE_ADDR dyn_ptr; | |
13437d4b | 787 | |
65728c26 DJ |
788 | /* Look for DT_MIPS_RLD_MAP first. MIPS executables use this |
789 | instead of DT_DEBUG, although they sometimes contain an unused | |
790 | DT_DEBUG. */ | |
97ec2c2f UW |
791 | if (scan_dyntag (DT_MIPS_RLD_MAP, exec_bfd, &dyn_ptr) |
792 | || scan_dyntag_auxv (DT_MIPS_RLD_MAP, &dyn_ptr)) | |
3a40aaa0 | 793 | { |
b6da22b0 | 794 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
3a40aaa0 | 795 | gdb_byte *pbuf; |
b6da22b0 | 796 | int pbuf_size = TYPE_LENGTH (ptr_type); |
3a40aaa0 UW |
797 | pbuf = alloca (pbuf_size); |
798 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
799 | of the dynamic link structure. */ | |
800 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) | |
e499d0f1 | 801 | return 0; |
b6da22b0 | 802 | return extract_typed_address (pbuf, ptr_type); |
e499d0f1 DJ |
803 | } |
804 | ||
65728c26 | 805 | /* Find DT_DEBUG. */ |
97ec2c2f UW |
806 | if (scan_dyntag (DT_DEBUG, exec_bfd, &dyn_ptr) |
807 | || scan_dyntag_auxv (DT_DEBUG, &dyn_ptr)) | |
65728c26 DJ |
808 | return dyn_ptr; |
809 | ||
3a40aaa0 UW |
810 | /* This may be a static executable. Look for the symbol |
811 | conventionally named _r_debug, as a last resort. */ | |
812 | msymbol = lookup_minimal_symbol ("_r_debug", NULL, symfile_objfile); | |
813 | if (msymbol != NULL) | |
814 | return SYMBOL_VALUE_ADDRESS (msymbol); | |
13437d4b KB |
815 | |
816 | /* DT_DEBUG entry not found. */ | |
817 | return 0; | |
818 | } | |
819 | ||
13437d4b KB |
820 | /* |
821 | ||
822 | LOCAL FUNCTION | |
823 | ||
824 | locate_base -- locate the base address of dynamic linker structs | |
825 | ||
826 | SYNOPSIS | |
827 | ||
1a816a87 | 828 | CORE_ADDR locate_base (struct svr4_info *) |
13437d4b KB |
829 | |
830 | DESCRIPTION | |
831 | ||
832 | For both the SunOS and SVR4 shared library implementations, if the | |
833 | inferior executable has been linked dynamically, there is a single | |
834 | address somewhere in the inferior's data space which is the key to | |
835 | locating all of the dynamic linker's runtime structures. This | |
836 | address is the value of the debug base symbol. The job of this | |
837 | function is to find and return that address, or to return 0 if there | |
838 | is no such address (the executable is statically linked for example). | |
839 | ||
840 | For SunOS, the job is almost trivial, since the dynamic linker and | |
841 | all of it's structures are statically linked to the executable at | |
842 | link time. Thus the symbol for the address we are looking for has | |
843 | already been added to the minimal symbol table for the executable's | |
844 | objfile at the time the symbol file's symbols were read, and all we | |
845 | have to do is look it up there. Note that we explicitly do NOT want | |
846 | to find the copies in the shared library. | |
847 | ||
848 | The SVR4 version is a bit more complicated because the address | |
849 | is contained somewhere in the dynamic info section. We have to go | |
850 | to a lot more work to discover the address of the debug base symbol. | |
851 | Because of this complexity, we cache the value we find and return that | |
852 | value on subsequent invocations. Note there is no copy in the | |
853 | executable symbol tables. | |
854 | ||
855 | */ | |
856 | ||
857 | static CORE_ADDR | |
1a816a87 | 858 | locate_base (struct svr4_info *info) |
13437d4b | 859 | { |
13437d4b KB |
860 | /* Check to see if we have a currently valid address, and if so, avoid |
861 | doing all this work again and just return the cached address. If | |
862 | we have no cached address, try to locate it in the dynamic info | |
d5a921c9 KB |
863 | section for ELF executables. There's no point in doing any of this |
864 | though if we don't have some link map offsets to work with. */ | |
13437d4b | 865 | |
1a816a87 | 866 | if (info->debug_base == 0 && svr4_have_link_map_offsets ()) |
0763ab81 | 867 | info->debug_base = elf_locate_base (); |
1a816a87 | 868 | return info->debug_base; |
13437d4b KB |
869 | } |
870 | ||
e4cd0d6a MK |
871 | /* Find the first element in the inferior's dynamic link map, and |
872 | return its address in the inferior. | |
13437d4b | 873 | |
e4cd0d6a MK |
874 | FIXME: Perhaps we should validate the info somehow, perhaps by |
875 | checking r_version for a known version number, or r_state for | |
876 | RT_CONSISTENT. */ | |
13437d4b KB |
877 | |
878 | static CORE_ADDR | |
1a816a87 | 879 | solib_svr4_r_map (struct svr4_info *info) |
13437d4b | 880 | { |
4b188b9f | 881 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 | 882 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
08597104 JB |
883 | CORE_ADDR addr = 0; |
884 | volatile struct gdb_exception ex; | |
13437d4b | 885 | |
08597104 JB |
886 | TRY_CATCH (ex, RETURN_MASK_ERROR) |
887 | { | |
888 | addr = read_memory_typed_address (info->debug_base + lmo->r_map_offset, | |
889 | ptr_type); | |
890 | } | |
891 | exception_print (gdb_stderr, ex); | |
892 | return addr; | |
e4cd0d6a | 893 | } |
13437d4b | 894 | |
7cd25cfc DJ |
895 | /* Find r_brk from the inferior's debug base. */ |
896 | ||
897 | static CORE_ADDR | |
1a816a87 | 898 | solib_svr4_r_brk (struct svr4_info *info) |
7cd25cfc DJ |
899 | { |
900 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 901 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
7cd25cfc | 902 | |
1a816a87 PA |
903 | return read_memory_typed_address (info->debug_base + lmo->r_brk_offset, |
904 | ptr_type); | |
7cd25cfc DJ |
905 | } |
906 | ||
e4cd0d6a MK |
907 | /* Find the link map for the dynamic linker (if it is not in the |
908 | normal list of loaded shared objects). */ | |
13437d4b | 909 | |
e4cd0d6a | 910 | static CORE_ADDR |
1a816a87 | 911 | solib_svr4_r_ldsomap (struct svr4_info *info) |
e4cd0d6a MK |
912 | { |
913 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
b6da22b0 | 914 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
e17a4113 | 915 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
e4cd0d6a | 916 | ULONGEST version; |
13437d4b | 917 | |
e4cd0d6a MK |
918 | /* Check version, and return zero if `struct r_debug' doesn't have |
919 | the r_ldsomap member. */ | |
1a816a87 PA |
920 | version |
921 | = read_memory_unsigned_integer (info->debug_base + lmo->r_version_offset, | |
e17a4113 | 922 | lmo->r_version_size, byte_order); |
e4cd0d6a MK |
923 | if (version < 2 || lmo->r_ldsomap_offset == -1) |
924 | return 0; | |
13437d4b | 925 | |
1a816a87 | 926 | return read_memory_typed_address (info->debug_base + lmo->r_ldsomap_offset, |
b6da22b0 | 927 | ptr_type); |
13437d4b KB |
928 | } |
929 | ||
de18c1d8 JM |
930 | /* On Solaris systems with some versions of the dynamic linker, |
931 | ld.so's l_name pointer points to the SONAME in the string table | |
932 | rather than into writable memory. So that GDB can find shared | |
933 | libraries when loading a core file generated by gcore, ensure that | |
934 | memory areas containing the l_name string are saved in the core | |
935 | file. */ | |
936 | ||
937 | static int | |
938 | svr4_keep_data_in_core (CORE_ADDR vaddr, unsigned long size) | |
939 | { | |
940 | struct svr4_info *info; | |
941 | CORE_ADDR ldsomap; | |
942 | struct so_list *new; | |
943 | struct cleanup *old_chain; | |
944 | struct link_map_offsets *lmo; | |
945 | CORE_ADDR lm_name; | |
946 | ||
947 | info = get_svr4_info (); | |
948 | ||
949 | info->debug_base = 0; | |
950 | locate_base (info); | |
951 | if (!info->debug_base) | |
952 | return 0; | |
953 | ||
954 | ldsomap = solib_svr4_r_ldsomap (info); | |
955 | if (!ldsomap) | |
956 | return 0; | |
957 | ||
958 | lmo = svr4_fetch_link_map_offsets (); | |
959 | new = XZALLOC (struct so_list); | |
960 | old_chain = make_cleanup (xfree, new); | |
961 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
962 | make_cleanup (xfree, new->lm_info); | |
963 | new->lm_info->l_addr = (CORE_ADDR)-1; | |
964 | new->lm_info->lm_addr = ldsomap; | |
965 | new->lm_info->lm = xzalloc (lmo->link_map_size); | |
966 | make_cleanup (xfree, new->lm_info->lm); | |
967 | read_memory (ldsomap, new->lm_info->lm, lmo->link_map_size); | |
968 | lm_name = LM_NAME (new); | |
969 | do_cleanups (old_chain); | |
970 | ||
971 | return (lm_name >= vaddr && lm_name < vaddr + size); | |
972 | } | |
973 | ||
13437d4b KB |
974 | /* |
975 | ||
976 | LOCAL FUNCTION | |
977 | ||
978 | open_symbol_file_object | |
979 | ||
980 | SYNOPSIS | |
981 | ||
982 | void open_symbol_file_object (void *from_tty) | |
983 | ||
984 | DESCRIPTION | |
985 | ||
986 | If no open symbol file, attempt to locate and open the main symbol | |
987 | file. On SVR4 systems, this is the first link map entry. If its | |
988 | name is here, we can open it. Useful when attaching to a process | |
989 | without first loading its symbol file. | |
990 | ||
991 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |
992 | be printed. This parameter is a pointer rather than an int because | |
993 | open_symbol_file_object() is called via catch_errors() and | |
994 | catch_errors() requires a pointer argument. */ | |
995 | ||
996 | static int | |
997 | open_symbol_file_object (void *from_ttyp) | |
998 | { | |
999 | CORE_ADDR lm, l_name; | |
1000 | char *filename; | |
1001 | int errcode; | |
1002 | int from_tty = *(int *)from_ttyp; | |
4b188b9f | 1003 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
b6da22b0 UW |
1004 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
1005 | int l_name_size = TYPE_LENGTH (ptr_type); | |
cfaefc65 | 1006 | gdb_byte *l_name_buf = xmalloc (l_name_size); |
b8c9b27d | 1007 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); |
6c95b8df | 1008 | struct svr4_info *info = get_svr4_info (); |
13437d4b KB |
1009 | |
1010 | if (symfile_objfile) | |
9e2f0ad4 | 1011 | if (!query (_("Attempt to reload symbols from process? "))) |
13437d4b KB |
1012 | return 0; |
1013 | ||
7cd25cfc | 1014 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
1015 | info->debug_base = 0; |
1016 | if (locate_base (info) == 0) | |
13437d4b KB |
1017 | return 0; /* failed somehow... */ |
1018 | ||
1019 | /* First link map member should be the executable. */ | |
1a816a87 | 1020 | lm = solib_svr4_r_map (info); |
e4cd0d6a | 1021 | if (lm == 0) |
13437d4b KB |
1022 | return 0; /* failed somehow... */ |
1023 | ||
1024 | /* Read address of name from target memory to GDB. */ | |
cfaefc65 | 1025 | read_memory (lm + lmo->l_name_offset, l_name_buf, l_name_size); |
13437d4b | 1026 | |
cfaefc65 | 1027 | /* Convert the address to host format. */ |
b6da22b0 | 1028 | l_name = extract_typed_address (l_name_buf, ptr_type); |
13437d4b KB |
1029 | |
1030 | /* Free l_name_buf. */ | |
1031 | do_cleanups (cleanups); | |
1032 | ||
1033 | if (l_name == 0) | |
1034 | return 0; /* No filename. */ | |
1035 | ||
1036 | /* Now fetch the filename from target memory. */ | |
1037 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
ea5bf0a1 | 1038 | make_cleanup (xfree, filename); |
13437d4b KB |
1039 | |
1040 | if (errcode) | |
1041 | { | |
8a3fe4f8 | 1042 | warning (_("failed to read exec filename from attached file: %s"), |
13437d4b KB |
1043 | safe_strerror (errcode)); |
1044 | return 0; | |
1045 | } | |
1046 | ||
13437d4b | 1047 | /* Have a pathname: read the symbol file. */ |
1adeb98a | 1048 | symbol_file_add_main (filename, from_tty); |
13437d4b KB |
1049 | |
1050 | return 1; | |
1051 | } | |
13437d4b | 1052 | |
34439770 DJ |
1053 | /* If no shared library information is available from the dynamic |
1054 | linker, build a fallback list from other sources. */ | |
1055 | ||
1056 | static struct so_list * | |
1057 | svr4_default_sos (void) | |
1058 | { | |
6c95b8df | 1059 | struct svr4_info *info = get_svr4_info (); |
1a816a87 | 1060 | |
34439770 DJ |
1061 | struct so_list *head = NULL; |
1062 | struct so_list **link_ptr = &head; | |
1063 | ||
1a816a87 | 1064 | if (info->debug_loader_offset_p) |
34439770 DJ |
1065 | { |
1066 | struct so_list *new = XZALLOC (struct so_list); | |
1067 | ||
1068 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
1069 | ||
1070 | /* Nothing will ever check the cached copy of the link | |
1071 | map if we set l_addr. */ | |
1a816a87 | 1072 | new->lm_info->l_addr = info->debug_loader_offset; |
93a57060 | 1073 | new->lm_info->lm_addr = 0; |
34439770 DJ |
1074 | new->lm_info->lm = NULL; |
1075 | ||
1a816a87 PA |
1076 | strncpy (new->so_name, info->debug_loader_name, |
1077 | SO_NAME_MAX_PATH_SIZE - 1); | |
34439770 DJ |
1078 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
1079 | strcpy (new->so_original_name, new->so_name); | |
1080 | ||
1081 | *link_ptr = new; | |
1082 | link_ptr = &new->next; | |
1083 | } | |
1084 | ||
1085 | return head; | |
1086 | } | |
1087 | ||
13437d4b KB |
1088 | /* LOCAL FUNCTION |
1089 | ||
1090 | current_sos -- build a list of currently loaded shared objects | |
1091 | ||
1092 | SYNOPSIS | |
1093 | ||
1094 | struct so_list *current_sos () | |
1095 | ||
1096 | DESCRIPTION | |
1097 | ||
1098 | Build a list of `struct so_list' objects describing the shared | |
1099 | objects currently loaded in the inferior. This list does not | |
1100 | include an entry for the main executable file. | |
1101 | ||
1102 | Note that we only gather information directly available from the | |
1103 | inferior --- we don't examine any of the shared library files | |
1104 | themselves. The declaration of `struct so_list' says which fields | |
1105 | we provide values for. */ | |
1106 | ||
1107 | static struct so_list * | |
1108 | svr4_current_sos (void) | |
1109 | { | |
492928e4 | 1110 | CORE_ADDR lm, prev_lm; |
13437d4b KB |
1111 | struct so_list *head = 0; |
1112 | struct so_list **link_ptr = &head; | |
e4cd0d6a | 1113 | CORE_ADDR ldsomap = 0; |
1a816a87 PA |
1114 | struct svr4_info *info; |
1115 | ||
6c95b8df | 1116 | info = get_svr4_info (); |
13437d4b | 1117 | |
7cd25cfc | 1118 | /* Always locate the debug struct, in case it has moved. */ |
1a816a87 PA |
1119 | info->debug_base = 0; |
1120 | locate_base (info); | |
13437d4b | 1121 | |
7cd25cfc DJ |
1122 | /* If we can't find the dynamic linker's base structure, this |
1123 | must not be a dynamically linked executable. Hmm. */ | |
1a816a87 | 1124 | if (! info->debug_base) |
7cd25cfc | 1125 | return svr4_default_sos (); |
13437d4b KB |
1126 | |
1127 | /* Walk the inferior's link map list, and build our list of | |
1128 | `struct so_list' nodes. */ | |
492928e4 | 1129 | prev_lm = 0; |
1a816a87 | 1130 | lm = solib_svr4_r_map (info); |
34439770 | 1131 | |
13437d4b KB |
1132 | while (lm) |
1133 | { | |
4b188b9f | 1134 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f4456994 | 1135 | struct so_list *new = XZALLOC (struct so_list); |
b8c9b27d | 1136 | struct cleanup *old_chain = make_cleanup (xfree, new); |
492928e4 | 1137 | CORE_ADDR next_lm; |
13437d4b | 1138 | |
13437d4b | 1139 | new->lm_info = xmalloc (sizeof (struct lm_info)); |
b8c9b27d | 1140 | make_cleanup (xfree, new->lm_info); |
13437d4b | 1141 | |
831004b7 | 1142 | new->lm_info->l_addr = (CORE_ADDR)-1; |
93a57060 | 1143 | new->lm_info->lm_addr = lm; |
f4456994 | 1144 | new->lm_info->lm = xzalloc (lmo->link_map_size); |
b8c9b27d | 1145 | make_cleanup (xfree, new->lm_info->lm); |
13437d4b KB |
1146 | |
1147 | read_memory (lm, new->lm_info->lm, lmo->link_map_size); | |
1148 | ||
492928e4 JK |
1149 | next_lm = LM_NEXT (new); |
1150 | ||
1151 | if (LM_PREV (new) != prev_lm) | |
1152 | { | |
1153 | warning (_("Corrupted shared library list")); | |
1154 | free_so (new); | |
1155 | next_lm = 0; | |
1156 | } | |
13437d4b KB |
1157 | |
1158 | /* For SVR4 versions, the first entry in the link map is for the | |
1159 | inferior executable, so we must ignore it. For some versions of | |
1160 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1161 | does have a name, so we can no longer use a missing name to | |
1162 | decide when to ignore it. */ | |
492928e4 | 1163 | else if (IGNORE_FIRST_LINK_MAP_ENTRY (new) && ldsomap == 0) |
93a57060 | 1164 | { |
1a816a87 | 1165 | info->main_lm_addr = new->lm_info->lm_addr; |
93a57060 DJ |
1166 | free_so (new); |
1167 | } | |
13437d4b KB |
1168 | else |
1169 | { | |
1170 | int errcode; | |
1171 | char *buffer; | |
1172 | ||
1173 | /* Extract this shared object's name. */ | |
1174 | target_read_string (LM_NAME (new), &buffer, | |
1175 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
1176 | if (errcode != 0) | |
8a3fe4f8 AC |
1177 | warning (_("Can't read pathname for load map: %s."), |
1178 | safe_strerror (errcode)); | |
13437d4b KB |
1179 | else |
1180 | { | |
1181 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); | |
1182 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
13437d4b KB |
1183 | strcpy (new->so_original_name, new->so_name); |
1184 | } | |
ea5bf0a1 | 1185 | xfree (buffer); |
13437d4b KB |
1186 | |
1187 | /* If this entry has no name, or its name matches the name | |
1188 | for the main executable, don't include it in the list. */ | |
1189 | if (! new->so_name[0] | |
1190 | || match_main (new->so_name)) | |
1191 | free_so (new); | |
1192 | else | |
1193 | { | |
1194 | new->next = 0; | |
1195 | *link_ptr = new; | |
1196 | link_ptr = &new->next; | |
1197 | } | |
1198 | } | |
1199 | ||
492928e4 JK |
1200 | prev_lm = lm; |
1201 | lm = next_lm; | |
1202 | ||
e4cd0d6a MK |
1203 | /* On Solaris, the dynamic linker is not in the normal list of |
1204 | shared objects, so make sure we pick it up too. Having | |
1205 | symbol information for the dynamic linker is quite crucial | |
1206 | for skipping dynamic linker resolver code. */ | |
1207 | if (lm == 0 && ldsomap == 0) | |
492928e4 JK |
1208 | { |
1209 | lm = ldsomap = solib_svr4_r_ldsomap (info); | |
1210 | prev_lm = 0; | |
1211 | } | |
e4cd0d6a | 1212 | |
13437d4b KB |
1213 | discard_cleanups (old_chain); |
1214 | } | |
1215 | ||
34439770 DJ |
1216 | if (head == NULL) |
1217 | return svr4_default_sos (); | |
1218 | ||
13437d4b KB |
1219 | return head; |
1220 | } | |
1221 | ||
93a57060 | 1222 | /* Get the address of the link_map for a given OBJFILE. */ |
bc4a16ae EZ |
1223 | |
1224 | CORE_ADDR | |
1225 | svr4_fetch_objfile_link_map (struct objfile *objfile) | |
1226 | { | |
93a57060 | 1227 | struct so_list *so; |
6c95b8df | 1228 | struct svr4_info *info = get_svr4_info (); |
bc4a16ae | 1229 | |
93a57060 | 1230 | /* Cause svr4_current_sos() to be run if it hasn't been already. */ |
1a816a87 | 1231 | if (info->main_lm_addr == 0) |
93a57060 | 1232 | solib_add (NULL, 0, ¤t_target, auto_solib_add); |
bc4a16ae | 1233 | |
93a57060 DJ |
1234 | /* svr4_current_sos() will set main_lm_addr for the main executable. */ |
1235 | if (objfile == symfile_objfile) | |
1a816a87 | 1236 | return info->main_lm_addr; |
93a57060 DJ |
1237 | |
1238 | /* The other link map addresses may be found by examining the list | |
1239 | of shared libraries. */ | |
1240 | for (so = master_so_list (); so; so = so->next) | |
1241 | if (so->objfile == objfile) | |
1242 | return so->lm_info->lm_addr; | |
1243 | ||
1244 | /* Not found! */ | |
bc4a16ae EZ |
1245 | return 0; |
1246 | } | |
13437d4b KB |
1247 | |
1248 | /* On some systems, the only way to recognize the link map entry for | |
1249 | the main executable file is by looking at its name. Return | |
1250 | non-zero iff SONAME matches one of the known main executable names. */ | |
1251 | ||
1252 | static int | |
1253 | match_main (char *soname) | |
1254 | { | |
1255 | char **mainp; | |
1256 | ||
1257 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
1258 | { | |
1259 | if (strcmp (soname, *mainp) == 0) | |
1260 | return (1); | |
1261 | } | |
1262 | ||
1263 | return (0); | |
1264 | } | |
1265 | ||
13437d4b KB |
1266 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
1267 | SVR4 run time loader. */ | |
13437d4b | 1268 | |
7d522c90 | 1269 | int |
d7fa2ae2 | 1270 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) |
13437d4b | 1271 | { |
6c95b8df PA |
1272 | struct svr4_info *info = get_svr4_info (); |
1273 | ||
1274 | return ((pc >= info->interp_text_sect_low | |
1275 | && pc < info->interp_text_sect_high) | |
1276 | || (pc >= info->interp_plt_sect_low | |
1277 | && pc < info->interp_plt_sect_high) | |
13437d4b KB |
1278 | || in_plt_section (pc, NULL)); |
1279 | } | |
13437d4b | 1280 | |
2f4950cd AC |
1281 | /* Given an executable's ABFD and target, compute the entry-point |
1282 | address. */ | |
1283 | ||
1284 | static CORE_ADDR | |
1285 | exec_entry_point (struct bfd *abfd, struct target_ops *targ) | |
1286 | { | |
1287 | /* KevinB wrote ... for most targets, the address returned by | |
1288 | bfd_get_start_address() is the entry point for the start | |
1289 | function. But, for some targets, bfd_get_start_address() returns | |
1290 | the address of a function descriptor from which the entry point | |
1291 | address may be extracted. This address is extracted by | |
1292 | gdbarch_convert_from_func_ptr_addr(). The method | |
1293 | gdbarch_convert_from_func_ptr_addr() is the merely the identify | |
1294 | function for targets which don't use function descriptors. */ | |
1cf3db46 | 1295 | return gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
2f4950cd AC |
1296 | bfd_get_start_address (abfd), |
1297 | targ); | |
1298 | } | |
13437d4b KB |
1299 | |
1300 | /* | |
1301 | ||
1302 | LOCAL FUNCTION | |
1303 | ||
1304 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1305 | ||
1306 | SYNOPSIS | |
1307 | ||
1308 | int enable_break (void) | |
1309 | ||
1310 | DESCRIPTION | |
1311 | ||
1312 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1313 | debugger interface, support for arranging for the inferior to hit | |
1314 | a breakpoint after mapping in the shared libraries. This function | |
1315 | enables that breakpoint. | |
1316 | ||
1317 | For SunOS, there is a special flag location (in_debugger) which we | |
1318 | set to 1. When the dynamic linker sees this flag set, it will set | |
1319 | a breakpoint at a location known only to itself, after saving the | |
1320 | original contents of that place and the breakpoint address itself, | |
1321 | in it's own internal structures. When we resume the inferior, it | |
1322 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1323 | We handle this (in a different place) by restoring the contents of | |
1324 | the breakpointed location (which is only known after it stops), | |
1325 | chasing around to locate the shared libraries that have been | |
1326 | loaded, then resuming. | |
1327 | ||
1328 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1329 | which is statically initialized at the time the shared library is | |
1330 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1331 | teed to be called once before mapping in a library, and again when | |
1332 | the mapping is complete. At the time we are examining this member, | |
1333 | it contains only the unrelocated offset of the function, so we have | |
1334 | to do our own relocation. Later, when the dynamic linker actually | |
1335 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1336 | ||
1337 | The debugger interface structure also contains an enumeration which | |
1338 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1339 | depending upon whether or not the library is being mapped or unmapped, | |
1340 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1341 | */ | |
1342 | ||
1343 | static int | |
268a4a75 | 1344 | enable_break (struct svr4_info *info, int from_tty) |
13437d4b | 1345 | { |
13437d4b KB |
1346 | struct minimal_symbol *msymbol; |
1347 | char **bkpt_namep; | |
1348 | asection *interp_sect; | |
97ec2c2f | 1349 | gdb_byte *interp_name; |
7cd25cfc | 1350 | CORE_ADDR sym_addr; |
13437d4b | 1351 | |
6c95b8df PA |
1352 | info->interp_text_sect_low = info->interp_text_sect_high = 0; |
1353 | info->interp_plt_sect_low = info->interp_plt_sect_high = 0; | |
13437d4b | 1354 | |
7cd25cfc DJ |
1355 | /* If we already have a shared library list in the target, and |
1356 | r_debug contains r_brk, set the breakpoint there - this should | |
1357 | mean r_brk has already been relocated. Assume the dynamic linker | |
1358 | is the object containing r_brk. */ | |
1359 | ||
268a4a75 | 1360 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
7cd25cfc | 1361 | sym_addr = 0; |
1a816a87 PA |
1362 | if (info->debug_base && solib_svr4_r_map (info) != 0) |
1363 | sym_addr = solib_svr4_r_brk (info); | |
7cd25cfc DJ |
1364 | |
1365 | if (sym_addr != 0) | |
1366 | { | |
1367 | struct obj_section *os; | |
1368 | ||
b36ec657 | 1369 | sym_addr = gdbarch_addr_bits_remove |
1cf3db46 | 1370 | (target_gdbarch, gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
b36ec657 DJ |
1371 | sym_addr, |
1372 | ¤t_target)); | |
1373 | ||
48379de6 DE |
1374 | /* On at least some versions of Solaris there's a dynamic relocation |
1375 | on _r_debug.r_brk and SYM_ADDR may not be relocated yet, e.g., if | |
1376 | we get control before the dynamic linker has self-relocated. | |
1377 | Check if SYM_ADDR is in a known section, if it is assume we can | |
1378 | trust its value. This is just a heuristic though, it could go away | |
1379 | or be replaced if it's getting in the way. | |
1380 | ||
1381 | On ARM we need to know whether the ISA of rtld_db_dlactivity (or | |
1382 | however it's spelled in your particular system) is ARM or Thumb. | |
1383 | That knowledge is encoded in the address, if it's Thumb the low bit | |
1384 | is 1. However, we've stripped that info above and it's not clear | |
1385 | what all the consequences are of passing a non-addr_bits_remove'd | |
1386 | address to create_solib_event_breakpoint. The call to | |
1387 | find_pc_section verifies we know about the address and have some | |
1388 | hope of computing the right kind of breakpoint to use (via | |
1389 | symbol info). It does mean that GDB needs to be pointed at a | |
1390 | non-stripped version of the dynamic linker in order to obtain | |
1391 | information it already knows about. Sigh. */ | |
1392 | ||
7cd25cfc DJ |
1393 | os = find_pc_section (sym_addr); |
1394 | if (os != NULL) | |
1395 | { | |
1396 | /* Record the relocated start and end address of the dynamic linker | |
1397 | text and plt section for svr4_in_dynsym_resolve_code. */ | |
1398 | bfd *tmp_bfd; | |
1399 | CORE_ADDR load_addr; | |
1400 | ||
1401 | tmp_bfd = os->objfile->obfd; | |
1402 | load_addr = ANOFFSET (os->objfile->section_offsets, | |
1403 | os->objfile->sect_index_text); | |
1404 | ||
1405 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
1406 | if (interp_sect) | |
1407 | { | |
6c95b8df | 1408 | info->interp_text_sect_low = |
7cd25cfc | 1409 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1410 | info->interp_text_sect_high = |
1411 | info->interp_text_sect_low | |
1412 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1413 | } |
1414 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1415 | if (interp_sect) | |
1416 | { | |
6c95b8df | 1417 | info->interp_plt_sect_low = |
7cd25cfc | 1418 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1419 | info->interp_plt_sect_high = |
1420 | info->interp_plt_sect_low | |
1421 | + bfd_section_size (tmp_bfd, interp_sect); | |
7cd25cfc DJ |
1422 | } |
1423 | ||
a6d9a66e | 1424 | create_solib_event_breakpoint (target_gdbarch, sym_addr); |
7cd25cfc DJ |
1425 | return 1; |
1426 | } | |
1427 | } | |
1428 | ||
97ec2c2f | 1429 | /* Find the program interpreter; if not found, warn the user and drop |
13437d4b | 1430 | into the old breakpoint at symbol code. */ |
97ec2c2f UW |
1431 | interp_name = find_program_interpreter (); |
1432 | if (interp_name) | |
13437d4b | 1433 | { |
8ad2fcde KB |
1434 | CORE_ADDR load_addr = 0; |
1435 | int load_addr_found = 0; | |
2ec9a4f8 | 1436 | int loader_found_in_list = 0; |
f8766ec1 | 1437 | struct so_list *so; |
e4f7b8c8 | 1438 | bfd *tmp_bfd = NULL; |
2f4950cd | 1439 | struct target_ops *tmp_bfd_target; |
f1838a98 | 1440 | volatile struct gdb_exception ex; |
13437d4b | 1441 | |
7cd25cfc | 1442 | sym_addr = 0; |
13437d4b KB |
1443 | |
1444 | /* Now we need to figure out where the dynamic linker was | |
1445 | loaded so that we can load its symbols and place a breakpoint | |
1446 | in the dynamic linker itself. | |
1447 | ||
1448 | This address is stored on the stack. However, I've been unable | |
1449 | to find any magic formula to find it for Solaris (appears to | |
1450 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1451 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 | 1452 | |
f1838a98 UW |
1453 | TRY_CATCH (ex, RETURN_MASK_ALL) |
1454 | { | |
97ec2c2f | 1455 | tmp_bfd = solib_bfd_open (interp_name); |
f1838a98 | 1456 | } |
13437d4b KB |
1457 | if (tmp_bfd == NULL) |
1458 | goto bkpt_at_symbol; | |
1459 | ||
2f4950cd AC |
1460 | /* Now convert the TMP_BFD into a target. That way target, as |
1461 | well as BFD operations can be used. Note that closing the | |
1462 | target will also close the underlying bfd. */ | |
1463 | tmp_bfd_target = target_bfd_reopen (tmp_bfd); | |
1464 | ||
f8766ec1 KB |
1465 | /* On a running target, we can get the dynamic linker's base |
1466 | address from the shared library table. */ | |
f8766ec1 KB |
1467 | so = master_so_list (); |
1468 | while (so) | |
8ad2fcde | 1469 | { |
97ec2c2f | 1470 | if (svr4_same_1 (interp_name, so->so_original_name)) |
8ad2fcde KB |
1471 | { |
1472 | load_addr_found = 1; | |
2ec9a4f8 | 1473 | loader_found_in_list = 1; |
cc10cae3 | 1474 | load_addr = LM_ADDR_CHECK (so, tmp_bfd); |
8ad2fcde KB |
1475 | break; |
1476 | } | |
f8766ec1 | 1477 | so = so->next; |
8ad2fcde KB |
1478 | } |
1479 | ||
8d4e36ba JB |
1480 | /* If we were not able to find the base address of the loader |
1481 | from our so_list, then try using the AT_BASE auxilliary entry. */ | |
1482 | if (!load_addr_found) | |
1483 | if (target_auxv_search (¤t_target, AT_BASE, &load_addr) > 0) | |
ad3a0e5b JK |
1484 | { |
1485 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
1486 | ||
1487 | /* Ensure LOAD_ADDR has proper sign in its possible upper bits so | |
1488 | that `+ load_addr' will overflow CORE_ADDR width not creating | |
1489 | invalid addresses like 0x101234567 for 32bit inferiors on 64bit | |
1490 | GDB. */ | |
1491 | ||
d182d057 | 1492 | if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT)) |
ad3a0e5b | 1493 | { |
d182d057 | 1494 | CORE_ADDR space_size = (CORE_ADDR) 1 << addr_bit; |
ad3a0e5b JK |
1495 | CORE_ADDR tmp_entry_point = exec_entry_point (tmp_bfd, |
1496 | tmp_bfd_target); | |
1497 | ||
1498 | gdb_assert (load_addr < space_size); | |
1499 | ||
1500 | /* TMP_ENTRY_POINT exceeding SPACE_SIZE would be for prelinked | |
1501 | 64bit ld.so with 32bit executable, it should not happen. */ | |
1502 | ||
1503 | if (tmp_entry_point < space_size | |
1504 | && tmp_entry_point + load_addr >= space_size) | |
1505 | load_addr -= space_size; | |
1506 | } | |
1507 | ||
1508 | load_addr_found = 1; | |
1509 | } | |
8d4e36ba | 1510 | |
8ad2fcde KB |
1511 | /* Otherwise we find the dynamic linker's base address by examining |
1512 | the current pc (which should point at the entry point for the | |
8d4e36ba JB |
1513 | dynamic linker) and subtracting the offset of the entry point. |
1514 | ||
1515 | This is more fragile than the previous approaches, but is a good | |
1516 | fallback method because it has actually been working well in | |
1517 | most cases. */ | |
8ad2fcde | 1518 | if (!load_addr_found) |
fb14de7b | 1519 | { |
c2250ad1 UW |
1520 | struct regcache *regcache |
1521 | = get_thread_arch_regcache (inferior_ptid, target_gdbarch); | |
fb14de7b UW |
1522 | load_addr = (regcache_read_pc (regcache) |
1523 | - exec_entry_point (tmp_bfd, tmp_bfd_target)); | |
1524 | } | |
2ec9a4f8 DJ |
1525 | |
1526 | if (!loader_found_in_list) | |
34439770 | 1527 | { |
1a816a87 PA |
1528 | info->debug_loader_name = xstrdup (interp_name); |
1529 | info->debug_loader_offset_p = 1; | |
1530 | info->debug_loader_offset = load_addr; | |
268a4a75 | 1531 | solib_add (NULL, from_tty, ¤t_target, auto_solib_add); |
34439770 | 1532 | } |
13437d4b KB |
1533 | |
1534 | /* Record the relocated start and end address of the dynamic linker | |
d7fa2ae2 | 1535 | text and plt section for svr4_in_dynsym_resolve_code. */ |
13437d4b KB |
1536 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1537 | if (interp_sect) | |
1538 | { | |
6c95b8df | 1539 | info->interp_text_sect_low = |
13437d4b | 1540 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1541 | info->interp_text_sect_high = |
1542 | info->interp_text_sect_low | |
1543 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1544 | } |
1545 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1546 | if (interp_sect) | |
1547 | { | |
6c95b8df | 1548 | info->interp_plt_sect_low = |
13437d4b | 1549 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; |
6c95b8df PA |
1550 | info->interp_plt_sect_high = |
1551 | info->interp_plt_sect_low | |
1552 | + bfd_section_size (tmp_bfd, interp_sect); | |
13437d4b KB |
1553 | } |
1554 | ||
1555 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1556 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1557 | { | |
2bbe3cc1 | 1558 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); |
13437d4b KB |
1559 | if (sym_addr != 0) |
1560 | break; | |
1561 | } | |
1562 | ||
2bbe3cc1 DJ |
1563 | if (sym_addr != 0) |
1564 | /* Convert 'sym_addr' from a function pointer to an address. | |
1565 | Because we pass tmp_bfd_target instead of the current | |
1566 | target, this will always produce an unrelocated value. */ | |
1cf3db46 | 1567 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, |
2bbe3cc1 DJ |
1568 | sym_addr, |
1569 | tmp_bfd_target); | |
1570 | ||
2f4950cd AC |
1571 | /* We're done with both the temporary bfd and target. Remember, |
1572 | closing the target closes the underlying bfd. */ | |
1573 | target_close (tmp_bfd_target, 0); | |
13437d4b KB |
1574 | |
1575 | if (sym_addr != 0) | |
1576 | { | |
a6d9a66e | 1577 | create_solib_event_breakpoint (target_gdbarch, load_addr + sym_addr); |
97ec2c2f | 1578 | xfree (interp_name); |
13437d4b KB |
1579 | return 1; |
1580 | } | |
1581 | ||
1582 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1583 | linker. Warn and drop into the old code. */ | |
1584 | bkpt_at_symbol: | |
97ec2c2f | 1585 | xfree (interp_name); |
82d03102 PG |
1586 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
1587 | "GDB will be unable to debug shared library initializers\n" | |
1588 | "and track explicitly loaded dynamic code.")); | |
13437d4b | 1589 | } |
13437d4b | 1590 | |
e499d0f1 DJ |
1591 | /* Scan through the lists of symbols, trying to look up the symbol and |
1592 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1593 | ||
1594 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1595 | { | |
1596 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1597 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1598 | { | |
de64a9ac JM |
1599 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
1600 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, | |
1601 | sym_addr, | |
1602 | ¤t_target); | |
1603 | create_solib_event_breakpoint (target_gdbarch, sym_addr); | |
e499d0f1 DJ |
1604 | return 1; |
1605 | } | |
1606 | } | |
13437d4b | 1607 | |
13437d4b KB |
1608 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) |
1609 | { | |
1610 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1611 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1612 | { | |
de64a9ac JM |
1613 | sym_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
1614 | sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, | |
1615 | sym_addr, | |
1616 | ¤t_target); | |
1617 | create_solib_event_breakpoint (target_gdbarch, sym_addr); | |
13437d4b KB |
1618 | return 1; |
1619 | } | |
1620 | } | |
542c95c2 | 1621 | return 0; |
13437d4b KB |
1622 | } |
1623 | ||
1624 | /* | |
1625 | ||
1626 | LOCAL FUNCTION | |
1627 | ||
1628 | special_symbol_handling -- additional shared library symbol handling | |
1629 | ||
1630 | SYNOPSIS | |
1631 | ||
1632 | void special_symbol_handling () | |
1633 | ||
1634 | DESCRIPTION | |
1635 | ||
1636 | Once the symbols from a shared object have been loaded in the usual | |
1637 | way, we are called to do any system specific symbol handling that | |
1638 | is needed. | |
1639 | ||
ab31aa69 | 1640 | For SunOS4, this consisted of grunging around in the dynamic |
13437d4b KB |
1641 | linkers structures to find symbol definitions for "common" symbols |
1642 | and adding them to the minimal symbol table for the runtime common | |
1643 | objfile. | |
1644 | ||
ab31aa69 KB |
1645 | However, for SVR4, there's nothing to do. |
1646 | ||
13437d4b KB |
1647 | */ |
1648 | ||
1649 | static void | |
1650 | svr4_special_symbol_handling (void) | |
1651 | { | |
9f2982ff | 1652 | svr4_relocate_main_executable (); |
13437d4b KB |
1653 | } |
1654 | ||
09919ac2 JK |
1655 | /* Read the ELF program headers from ABFD. Return the contents and |
1656 | set *PHDRS_SIZE to the size of the program headers. */ | |
e2a44558 | 1657 | |
09919ac2 JK |
1658 | static gdb_byte * |
1659 | read_program_headers_from_bfd (bfd *abfd, int *phdrs_size) | |
e2a44558 | 1660 | { |
09919ac2 JK |
1661 | Elf_Internal_Ehdr *ehdr; |
1662 | gdb_byte *buf; | |
e2a44558 | 1663 | |
09919ac2 | 1664 | ehdr = elf_elfheader (abfd); |
b8040f19 | 1665 | |
09919ac2 JK |
1666 | *phdrs_size = ehdr->e_phnum * ehdr->e_phentsize; |
1667 | if (*phdrs_size == 0) | |
1668 | return NULL; | |
1669 | ||
1670 | buf = xmalloc (*phdrs_size); | |
1671 | if (bfd_seek (abfd, ehdr->e_phoff, SEEK_SET) != 0 | |
1672 | || bfd_bread (buf, *phdrs_size, abfd) != *phdrs_size) | |
1673 | { | |
1674 | xfree (buf); | |
1675 | return NULL; | |
1676 | } | |
1677 | ||
1678 | return buf; | |
b8040f19 JK |
1679 | } |
1680 | ||
01c30d6e JK |
1681 | /* Return 1 and fill *DISPLACEMENTP with detected PIE offset of inferior |
1682 | exec_bfd. Otherwise return 0. | |
1683 | ||
1684 | We relocate all of the sections by the same amount. This | |
b8040f19 JK |
1685 | behavior is mandated by recent editions of the System V ABI. |
1686 | According to the System V Application Binary Interface, | |
1687 | Edition 4.1, page 5-5: | |
1688 | ||
1689 | ... Though the system chooses virtual addresses for | |
1690 | individual processes, it maintains the segments' relative | |
1691 | positions. Because position-independent code uses relative | |
1692 | addressesing between segments, the difference between | |
1693 | virtual addresses in memory must match the difference | |
1694 | between virtual addresses in the file. The difference | |
1695 | between the virtual address of any segment in memory and | |
1696 | the corresponding virtual address in the file is thus a | |
1697 | single constant value for any one executable or shared | |
1698 | object in a given process. This difference is the base | |
1699 | address. One use of the base address is to relocate the | |
1700 | memory image of the program during dynamic linking. | |
1701 | ||
1702 | The same language also appears in Edition 4.0 of the System V | |
09919ac2 JK |
1703 | ABI and is left unspecified in some of the earlier editions. |
1704 | ||
1705 | Decide if the objfile needs to be relocated. As indicated above, we will | |
1706 | only be here when execution is stopped. But during attachment PC can be at | |
1707 | arbitrary address therefore regcache_read_pc can be misleading (contrary to | |
1708 | the auxv AT_ENTRY value). Moreover for executable with interpreter section | |
1709 | regcache_read_pc would point to the interpreter and not the main executable. | |
1710 | ||
1711 | So, to summarize, relocations are necessary when the start address obtained | |
1712 | from the executable is different from the address in auxv AT_ENTRY entry. | |
1713 | ||
1714 | [ The astute reader will note that we also test to make sure that | |
1715 | the executable in question has the DYNAMIC flag set. It is my | |
1716 | opinion that this test is unnecessary (undesirable even). It | |
1717 | was added to avoid inadvertent relocation of an executable | |
1718 | whose e_type member in the ELF header is not ET_DYN. There may | |
1719 | be a time in the future when it is desirable to do relocations | |
1720 | on other types of files as well in which case this condition | |
1721 | should either be removed or modified to accomodate the new file | |
1722 | type. - Kevin, Nov 2000. ] */ | |
b8040f19 | 1723 | |
01c30d6e JK |
1724 | static int |
1725 | svr4_exec_displacement (CORE_ADDR *displacementp) | |
b8040f19 | 1726 | { |
41752192 JK |
1727 | /* ENTRY_POINT is a possible function descriptor - before |
1728 | a call to gdbarch_convert_from_func_ptr_addr. */ | |
09919ac2 | 1729 | CORE_ADDR entry_point, displacement; |
b8040f19 JK |
1730 | |
1731 | if (exec_bfd == NULL) | |
1732 | return 0; | |
1733 | ||
09919ac2 JK |
1734 | /* Therefore for ELF it is ET_EXEC and not ET_DYN. Both shared libraries |
1735 | being executed themselves and PIE (Position Independent Executable) | |
1736 | executables are ET_DYN. */ | |
1737 | ||
1738 | if ((bfd_get_file_flags (exec_bfd) & DYNAMIC) == 0) | |
1739 | return 0; | |
1740 | ||
1741 | if (target_auxv_search (¤t_target, AT_ENTRY, &entry_point) <= 0) | |
1742 | return 0; | |
1743 | ||
1744 | displacement = entry_point - bfd_get_start_address (exec_bfd); | |
1745 | ||
1746 | /* Verify the DISPLACEMENT candidate complies with the required page | |
1747 | alignment. It is cheaper than the program headers comparison below. */ | |
1748 | ||
1749 | if (bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
1750 | { | |
1751 | const struct elf_backend_data *elf = get_elf_backend_data (exec_bfd); | |
1752 | ||
1753 | /* p_align of PT_LOAD segments does not specify any alignment but | |
1754 | only congruency of addresses: | |
1755 | p_offset % p_align == p_vaddr % p_align | |
1756 | Kernel is free to load the executable with lower alignment. */ | |
1757 | ||
1758 | if ((displacement & (elf->minpagesize - 1)) != 0) | |
1759 | return 0; | |
1760 | } | |
1761 | ||
1762 | /* Verify that the auxilliary vector describes the same file as exec_bfd, by | |
1763 | comparing their program headers. If the program headers in the auxilliary | |
1764 | vector do not match the program headers in the executable, then we are | |
1765 | looking at a different file than the one used by the kernel - for | |
1766 | instance, "gdb program" connected to "gdbserver :PORT ld.so program". */ | |
1767 | ||
1768 | if (bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
1769 | { | |
1770 | /* Be optimistic and clear OK only if GDB was able to verify the headers | |
1771 | really do not match. */ | |
1772 | int phdrs_size, phdrs2_size, ok = 1; | |
1773 | gdb_byte *buf, *buf2; | |
1774 | ||
1775 | buf = read_program_header (-1, &phdrs_size, NULL); | |
1776 | buf2 = read_program_headers_from_bfd (exec_bfd, &phdrs2_size); | |
1777 | if (buf != NULL && buf2 != NULL | |
1778 | && (phdrs_size != phdrs2_size | |
1779 | || memcmp (buf, buf2, phdrs_size) != 0)) | |
1780 | ok = 0; | |
1781 | ||
1782 | xfree (buf); | |
1783 | xfree (buf2); | |
1784 | ||
1785 | if (!ok) | |
1786 | return 0; | |
1787 | } | |
b8040f19 | 1788 | |
ccf26247 JK |
1789 | if (info_verbose) |
1790 | { | |
1791 | /* It can be printed repeatedly as there is no easy way to check | |
1792 | the executable symbols/file has been already relocated to | |
1793 | displacement. */ | |
1794 | ||
1795 | printf_unfiltered (_("Using PIE (Position Independent Executable) " | |
1796 | "displacement %s for \"%s\".\n"), | |
1797 | paddress (target_gdbarch, displacement), | |
1798 | bfd_get_filename (exec_bfd)); | |
1799 | } | |
1800 | ||
01c30d6e JK |
1801 | *displacementp = displacement; |
1802 | return 1; | |
b8040f19 JK |
1803 | } |
1804 | ||
1805 | /* Relocate the main executable. This function should be called upon | |
1806 | stopping the inferior process at the entry point to the program. | |
1807 | The entry point from BFD is compared to the AT_ENTRY of AUXV and if they are | |
1808 | different, the main executable is relocated by the proper amount. */ | |
1809 | ||
1810 | static void | |
1811 | svr4_relocate_main_executable (void) | |
1812 | { | |
01c30d6e JK |
1813 | CORE_ADDR displacement; |
1814 | ||
1815 | if (symfile_objfile) | |
1816 | { | |
1817 | int i; | |
1818 | ||
1819 | /* Remote target may have already set specific offsets by `qOffsets' | |
1820 | which should be preferred. */ | |
1821 | ||
1822 | for (i = 0; i < symfile_objfile->num_sections; i++) | |
1823 | if (ANOFFSET (symfile_objfile->section_offsets, i) != 0) | |
1824 | return; | |
1825 | } | |
1826 | ||
1827 | if (! svr4_exec_displacement (&displacement)) | |
1828 | return; | |
b8040f19 | 1829 | |
01c30d6e JK |
1830 | /* Even DISPLACEMENT 0 is a valid new difference of in-memory vs. in-file |
1831 | addresses. */ | |
b8040f19 JK |
1832 | |
1833 | if (symfile_objfile) | |
e2a44558 | 1834 | { |
e2a44558 | 1835 | struct section_offsets *new_offsets; |
b8040f19 | 1836 | int i; |
e2a44558 | 1837 | |
b8040f19 JK |
1838 | new_offsets = alloca (symfile_objfile->num_sections |
1839 | * sizeof (*new_offsets)); | |
e2a44558 | 1840 | |
b8040f19 JK |
1841 | for (i = 0; i < symfile_objfile->num_sections; i++) |
1842 | new_offsets->offsets[i] = displacement; | |
e2a44558 | 1843 | |
b8040f19 | 1844 | objfile_relocate (symfile_objfile, new_offsets); |
e2a44558 | 1845 | } |
51bee8e9 JK |
1846 | else if (exec_bfd) |
1847 | { | |
1848 | asection *asect; | |
1849 | ||
1850 | for (asect = exec_bfd->sections; asect != NULL; asect = asect->next) | |
1851 | exec_set_section_address (bfd_get_filename (exec_bfd), asect->index, | |
1852 | (bfd_section_vma (exec_bfd, asect) | |
1853 | + displacement)); | |
1854 | } | |
e2a44558 KB |
1855 | } |
1856 | ||
13437d4b KB |
1857 | /* |
1858 | ||
1859 | GLOBAL FUNCTION | |
1860 | ||
1861 | svr4_solib_create_inferior_hook -- shared library startup support | |
1862 | ||
1863 | SYNOPSIS | |
1864 | ||
268a4a75 | 1865 | void svr4_solib_create_inferior_hook (int from_tty) |
13437d4b KB |
1866 | |
1867 | DESCRIPTION | |
1868 | ||
1869 | When gdb starts up the inferior, it nurses it along (through the | |
1870 | shell) until it is ready to execute it's first instruction. At this | |
1871 | point, this function gets called via expansion of the macro | |
1872 | SOLIB_CREATE_INFERIOR_HOOK. | |
1873 | ||
1874 | For SunOS executables, this first instruction is typically the | |
1875 | one at "_start", or a similar text label, regardless of whether | |
1876 | the executable is statically or dynamically linked. The runtime | |
1877 | startup code takes care of dynamically linking in any shared | |
1878 | libraries, once gdb allows the inferior to continue. | |
1879 | ||
1880 | For SVR4 executables, this first instruction is either the first | |
1881 | instruction in the dynamic linker (for dynamically linked | |
1882 | executables) or the instruction at "start" for statically linked | |
1883 | executables. For dynamically linked executables, the system | |
1884 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1885 | and starts it running. The dynamic linker maps in any needed | |
1886 | shared libraries, maps in the actual user executable, and then | |
1887 | jumps to "start" in the user executable. | |
1888 | ||
1889 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1890 | can arrange to cooperate with the dynamic linker to discover the | |
1891 | names of shared libraries that are dynamically linked, and the | |
1892 | base addresses to which they are linked. | |
1893 | ||
1894 | This function is responsible for discovering those names and | |
1895 | addresses, and saving sufficient information about them to allow | |
1896 | their symbols to be read at a later time. | |
1897 | ||
1898 | FIXME | |
1899 | ||
1900 | Between enable_break() and disable_break(), this code does not | |
1901 | properly handle hitting breakpoints which the user might have | |
1902 | set in the startup code or in the dynamic linker itself. Proper | |
1903 | handling will probably have to wait until the implementation is | |
1904 | changed to use the "breakpoint handler function" method. | |
1905 | ||
1906 | Also, what if child has exit()ed? Must exit loop somehow. | |
1907 | */ | |
1908 | ||
e2a44558 | 1909 | static void |
268a4a75 | 1910 | svr4_solib_create_inferior_hook (int from_tty) |
13437d4b | 1911 | { |
d6b48e9c | 1912 | struct inferior *inf; |
2020b7ab | 1913 | struct thread_info *tp; |
1a816a87 PA |
1914 | struct svr4_info *info; |
1915 | ||
6c95b8df | 1916 | info = get_svr4_info (); |
2020b7ab | 1917 | |
e2a44558 | 1918 | /* Relocate the main executable if necessary. */ |
9f2982ff JK |
1919 | if (current_inferior ()->attach_flag == 0) |
1920 | svr4_relocate_main_executable (); | |
e2a44558 | 1921 | |
d5a921c9 | 1922 | if (!svr4_have_link_map_offsets ()) |
513f5903 | 1923 | return; |
d5a921c9 | 1924 | |
268a4a75 | 1925 | if (!enable_break (info, from_tty)) |
542c95c2 | 1926 | return; |
13437d4b | 1927 | |
ab31aa69 KB |
1928 | #if defined(_SCO_DS) |
1929 | /* SCO needs the loop below, other systems should be using the | |
13437d4b KB |
1930 | special shared library breakpoints and the shared library breakpoint |
1931 | service routine. | |
1932 | ||
1933 | Now run the target. It will eventually hit the breakpoint, at | |
1934 | which point all of the libraries will have been mapped in and we | |
1935 | can go groveling around in the dynamic linker structures to find | |
1936 | out what we need to know about them. */ | |
1937 | ||
d6b48e9c | 1938 | inf = current_inferior (); |
2020b7ab PA |
1939 | tp = inferior_thread (); |
1940 | ||
13437d4b | 1941 | clear_proceed_status (); |
d6b48e9c | 1942 | inf->stop_soon = STOP_QUIETLY; |
2020b7ab | 1943 | tp->stop_signal = TARGET_SIGNAL_0; |
13437d4b KB |
1944 | do |
1945 | { | |
2020b7ab | 1946 | target_resume (pid_to_ptid (-1), 0, tp->stop_signal); |
ae123ec6 | 1947 | wait_for_inferior (0); |
13437d4b | 1948 | } |
2020b7ab | 1949 | while (tp->stop_signal != TARGET_SIGNAL_TRAP); |
d6b48e9c | 1950 | inf->stop_soon = NO_STOP_QUIETLY; |
ab31aa69 | 1951 | #endif /* defined(_SCO_DS) */ |
13437d4b KB |
1952 | } |
1953 | ||
1954 | static void | |
1955 | svr4_clear_solib (void) | |
1956 | { | |
6c95b8df PA |
1957 | struct svr4_info *info; |
1958 | ||
1959 | info = get_svr4_info (); | |
1960 | info->debug_base = 0; | |
1961 | info->debug_loader_offset_p = 0; | |
1962 | info->debug_loader_offset = 0; | |
1963 | xfree (info->debug_loader_name); | |
1964 | info->debug_loader_name = NULL; | |
13437d4b KB |
1965 | } |
1966 | ||
1967 | static void | |
1968 | svr4_free_so (struct so_list *so) | |
1969 | { | |
b8c9b27d KB |
1970 | xfree (so->lm_info->lm); |
1971 | xfree (so->lm_info); | |
13437d4b KB |
1972 | } |
1973 | ||
6bb7be43 JB |
1974 | |
1975 | /* Clear any bits of ADDR that wouldn't fit in a target-format | |
1976 | data pointer. "Data pointer" here refers to whatever sort of | |
1977 | address the dynamic linker uses to manage its sections. At the | |
1978 | moment, we don't support shared libraries on any processors where | |
1979 | code and data pointers are different sizes. | |
1980 | ||
1981 | This isn't really the right solution. What we really need here is | |
1982 | a way to do arithmetic on CORE_ADDR values that respects the | |
1983 | natural pointer/address correspondence. (For example, on the MIPS, | |
1984 | converting a 32-bit pointer to a 64-bit CORE_ADDR requires you to | |
1985 | sign-extend the value. There, simply truncating the bits above | |
819844ad | 1986 | gdbarch_ptr_bit, as we do below, is no good.) This should probably |
6bb7be43 JB |
1987 | be a new gdbarch method or something. */ |
1988 | static CORE_ADDR | |
1989 | svr4_truncate_ptr (CORE_ADDR addr) | |
1990 | { | |
1cf3db46 | 1991 | if (gdbarch_ptr_bit (target_gdbarch) == sizeof (CORE_ADDR) * 8) |
6bb7be43 JB |
1992 | /* We don't need to truncate anything, and the bit twiddling below |
1993 | will fail due to overflow problems. */ | |
1994 | return addr; | |
1995 | else | |
1cf3db46 | 1996 | return addr & (((CORE_ADDR) 1 << gdbarch_ptr_bit (target_gdbarch)) - 1); |
6bb7be43 JB |
1997 | } |
1998 | ||
1999 | ||
749499cb KB |
2000 | static void |
2001 | svr4_relocate_section_addresses (struct so_list *so, | |
0542c86d | 2002 | struct target_section *sec) |
749499cb | 2003 | { |
cc10cae3 AO |
2004 | sec->addr = svr4_truncate_ptr (sec->addr + LM_ADDR_CHECK (so, |
2005 | sec->bfd)); | |
2006 | sec->endaddr = svr4_truncate_ptr (sec->endaddr + LM_ADDR_CHECK (so, | |
2007 | sec->bfd)); | |
749499cb | 2008 | } |
4b188b9f | 2009 | \f |
749499cb | 2010 | |
4b188b9f | 2011 | /* Architecture-specific operations. */ |
6bb7be43 | 2012 | |
4b188b9f MK |
2013 | /* Per-architecture data key. */ |
2014 | static struct gdbarch_data *solib_svr4_data; | |
e5e2b9ff | 2015 | |
4b188b9f | 2016 | struct solib_svr4_ops |
e5e2b9ff | 2017 | { |
4b188b9f MK |
2018 | /* Return a description of the layout of `struct link_map'. */ |
2019 | struct link_map_offsets *(*fetch_link_map_offsets)(void); | |
2020 | }; | |
e5e2b9ff | 2021 | |
4b188b9f | 2022 | /* Return a default for the architecture-specific operations. */ |
e5e2b9ff | 2023 | |
4b188b9f MK |
2024 | static void * |
2025 | solib_svr4_init (struct obstack *obstack) | |
e5e2b9ff | 2026 | { |
4b188b9f | 2027 | struct solib_svr4_ops *ops; |
e5e2b9ff | 2028 | |
4b188b9f | 2029 | ops = OBSTACK_ZALLOC (obstack, struct solib_svr4_ops); |
8d005789 | 2030 | ops->fetch_link_map_offsets = NULL; |
4b188b9f | 2031 | return ops; |
e5e2b9ff KB |
2032 | } |
2033 | ||
4b188b9f | 2034 | /* Set the architecture-specific `struct link_map_offsets' fetcher for |
7e3cb44c | 2035 | GDBARCH to FLMO. Also, install SVR4 solib_ops into GDBARCH. */ |
1c4dcb57 | 2036 | |
21479ded | 2037 | void |
e5e2b9ff KB |
2038 | set_solib_svr4_fetch_link_map_offsets (struct gdbarch *gdbarch, |
2039 | struct link_map_offsets *(*flmo) (void)) | |
21479ded | 2040 | { |
4b188b9f MK |
2041 | struct solib_svr4_ops *ops = gdbarch_data (gdbarch, solib_svr4_data); |
2042 | ||
2043 | ops->fetch_link_map_offsets = flmo; | |
7e3cb44c UW |
2044 | |
2045 | set_solib_ops (gdbarch, &svr4_so_ops); | |
21479ded KB |
2046 | } |
2047 | ||
4b188b9f MK |
2048 | /* Fetch a link_map_offsets structure using the architecture-specific |
2049 | `struct link_map_offsets' fetcher. */ | |
1c4dcb57 | 2050 | |
4b188b9f MK |
2051 | static struct link_map_offsets * |
2052 | svr4_fetch_link_map_offsets (void) | |
21479ded | 2053 | { |
1cf3db46 | 2054 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data); |
4b188b9f MK |
2055 | |
2056 | gdb_assert (ops->fetch_link_map_offsets); | |
2057 | return ops->fetch_link_map_offsets (); | |
21479ded KB |
2058 | } |
2059 | ||
4b188b9f MK |
2060 | /* Return 1 if a link map offset fetcher has been defined, 0 otherwise. */ |
2061 | ||
2062 | static int | |
2063 | svr4_have_link_map_offsets (void) | |
2064 | { | |
1cf3db46 | 2065 | struct solib_svr4_ops *ops = gdbarch_data (target_gdbarch, solib_svr4_data); |
4b188b9f MK |
2066 | return (ops->fetch_link_map_offsets != NULL); |
2067 | } | |
2068 | \f | |
2069 | ||
e4bbbda8 MK |
2070 | /* Most OS'es that have SVR4-style ELF dynamic libraries define a |
2071 | `struct r_debug' and a `struct link_map' that are binary compatible | |
2072 | with the origional SVR4 implementation. */ | |
2073 | ||
2074 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
2075 | for an ILP32 SVR4 system. */ | |
2076 | ||
2077 | struct link_map_offsets * | |
2078 | svr4_ilp32_fetch_link_map_offsets (void) | |
2079 | { | |
2080 | static struct link_map_offsets lmo; | |
2081 | static struct link_map_offsets *lmp = NULL; | |
2082 | ||
2083 | if (lmp == NULL) | |
2084 | { | |
2085 | lmp = &lmo; | |
2086 | ||
e4cd0d6a MK |
2087 | lmo.r_version_offset = 0; |
2088 | lmo.r_version_size = 4; | |
e4bbbda8 | 2089 | lmo.r_map_offset = 4; |
7cd25cfc | 2090 | lmo.r_brk_offset = 8; |
e4cd0d6a | 2091 | lmo.r_ldsomap_offset = 20; |
e4bbbda8 MK |
2092 | |
2093 | /* Everything we need is in the first 20 bytes. */ | |
2094 | lmo.link_map_size = 20; | |
2095 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 2096 | lmo.l_name_offset = 4; |
cc10cae3 | 2097 | lmo.l_ld_offset = 8; |
e4bbbda8 | 2098 | lmo.l_next_offset = 12; |
e4bbbda8 | 2099 | lmo.l_prev_offset = 16; |
e4bbbda8 MK |
2100 | } |
2101 | ||
2102 | return lmp; | |
2103 | } | |
2104 | ||
2105 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
2106 | for an LP64 SVR4 system. */ | |
2107 | ||
2108 | struct link_map_offsets * | |
2109 | svr4_lp64_fetch_link_map_offsets (void) | |
2110 | { | |
2111 | static struct link_map_offsets lmo; | |
2112 | static struct link_map_offsets *lmp = NULL; | |
2113 | ||
2114 | if (lmp == NULL) | |
2115 | { | |
2116 | lmp = &lmo; | |
2117 | ||
e4cd0d6a MK |
2118 | lmo.r_version_offset = 0; |
2119 | lmo.r_version_size = 4; | |
e4bbbda8 | 2120 | lmo.r_map_offset = 8; |
7cd25cfc | 2121 | lmo.r_brk_offset = 16; |
e4cd0d6a | 2122 | lmo.r_ldsomap_offset = 40; |
e4bbbda8 MK |
2123 | |
2124 | /* Everything we need is in the first 40 bytes. */ | |
2125 | lmo.link_map_size = 40; | |
2126 | lmo.l_addr_offset = 0; | |
e4bbbda8 | 2127 | lmo.l_name_offset = 8; |
cc10cae3 | 2128 | lmo.l_ld_offset = 16; |
e4bbbda8 | 2129 | lmo.l_next_offset = 24; |
e4bbbda8 | 2130 | lmo.l_prev_offset = 32; |
e4bbbda8 MK |
2131 | } |
2132 | ||
2133 | return lmp; | |
2134 | } | |
2135 | \f | |
2136 | ||
7d522c90 | 2137 | struct target_so_ops svr4_so_ops; |
13437d4b | 2138 | |
3a40aaa0 UW |
2139 | /* Lookup global symbol for ELF DSOs linked with -Bsymbolic. Those DSOs have a |
2140 | different rule for symbol lookup. The lookup begins here in the DSO, not in | |
2141 | the main executable. */ | |
2142 | ||
2143 | static struct symbol * | |
2144 | elf_lookup_lib_symbol (const struct objfile *objfile, | |
2145 | const char *name, | |
21b556f4 | 2146 | const domain_enum domain) |
3a40aaa0 | 2147 | { |
61f0d762 JK |
2148 | bfd *abfd; |
2149 | ||
2150 | if (objfile == symfile_objfile) | |
2151 | abfd = exec_bfd; | |
2152 | else | |
2153 | { | |
2154 | /* OBJFILE should have been passed as the non-debug one. */ | |
2155 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
2156 | ||
2157 | abfd = objfile->obfd; | |
2158 | } | |
2159 | ||
2160 | if (abfd == NULL || scan_dyntag (DT_SYMBOLIC, abfd, NULL) != 1) | |
3a40aaa0 UW |
2161 | return NULL; |
2162 | ||
94af9270 | 2163 | return lookup_global_symbol_from_objfile (objfile, name, domain); |
3a40aaa0 UW |
2164 | } |
2165 | ||
a78f21af AC |
2166 | extern initialize_file_ftype _initialize_svr4_solib; /* -Wmissing-prototypes */ |
2167 | ||
13437d4b KB |
2168 | void |
2169 | _initialize_svr4_solib (void) | |
2170 | { | |
4b188b9f | 2171 | solib_svr4_data = gdbarch_data_register_pre_init (solib_svr4_init); |
6c95b8df PA |
2172 | solib_svr4_pspace_data |
2173 | = register_program_space_data_with_cleanup (svr4_pspace_data_cleanup); | |
4b188b9f | 2174 | |
749499cb | 2175 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b KB |
2176 | svr4_so_ops.free_so = svr4_free_so; |
2177 | svr4_so_ops.clear_solib = svr4_clear_solib; | |
2178 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
2179 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |
2180 | svr4_so_ops.current_sos = svr4_current_sos; | |
2181 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
d7fa2ae2 | 2182 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; |
831a0c44 | 2183 | svr4_so_ops.bfd_open = solib_bfd_open; |
3a40aaa0 | 2184 | svr4_so_ops.lookup_lib_global_symbol = elf_lookup_lib_symbol; |
a7c02bc8 | 2185 | svr4_so_ops.same = svr4_same; |
de18c1d8 | 2186 | svr4_so_ops.keep_data_in_core = svr4_keep_data_in_core; |
13437d4b | 2187 | } |