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ab31aa69 | 1 | /* Handle SVR4 shared libraries for GDB, the GNU Debugger. |
2f4950cd | 2 | |
197e01b6 | 3 | Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, |
e4cd0d6a | 4 | 2000, 2001, 2003, 2004, 2005, 2006 |
e4bbbda8 | 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 | |
11 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
20 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
21 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
22 | Boston, MA 02110-1301, USA. */ | |
13437d4b | 23 | |
13437d4b KB |
24 | #include "defs.h" |
25 | ||
13437d4b | 26 | #include "elf/external.h" |
21479ded | 27 | #include "elf/common.h" |
f7856c8f | 28 | #include "elf/mips.h" |
13437d4b KB |
29 | |
30 | #include "symtab.h" | |
31 | #include "bfd.h" | |
32 | #include "symfile.h" | |
33 | #include "objfiles.h" | |
34 | #include "gdbcore.h" | |
13437d4b | 35 | #include "target.h" |
13437d4b | 36 | #include "inferior.h" |
13437d4b | 37 | |
4b188b9f MK |
38 | #include "gdb_assert.h" |
39 | ||
13437d4b | 40 | #include "solist.h" |
bba93f6c | 41 | #include "solib.h" |
13437d4b KB |
42 | #include "solib-svr4.h" |
43 | ||
2f4950cd | 44 | #include "bfd-target.h" |
cc10cae3 | 45 | #include "elf-bfd.h" |
2f4950cd AC |
46 | #include "exec.h" |
47 | ||
e5e2b9ff | 48 | static struct link_map_offsets *svr4_fetch_link_map_offsets (void); |
d5a921c9 | 49 | static int svr4_have_link_map_offsets (void); |
1c4dcb57 | 50 | |
4b188b9f MK |
51 | /* This hook is set to a function that provides native link map |
52 | offsets if the code in solib-legacy.c is linked in. */ | |
53 | struct link_map_offsets *(*legacy_svr4_fetch_link_map_offsets_hook) (void); | |
21479ded | 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; | |
13437d4b KB |
70 | }; |
71 | ||
72 | /* On SVR4 systems, a list of symbols in the dynamic linker where | |
73 | GDB can try to place a breakpoint to monitor shared library | |
74 | events. | |
75 | ||
76 | If none of these symbols are found, or other errors occur, then | |
77 | SVR4 systems will fall back to using a symbol as the "startup | |
78 | mapping complete" breakpoint address. */ | |
79 | ||
13437d4b KB |
80 | static char *solib_break_names[] = |
81 | { | |
82 | "r_debug_state", | |
83 | "_r_debug_state", | |
84 | "_dl_debug_state", | |
85 | "rtld_db_dlactivity", | |
1f72e589 | 86 | "_rtld_debug_state", |
4c0122c8 JB |
87 | |
88 | /* On the 64-bit PowerPC, the linker symbol with the same name as | |
89 | the C function points to a function descriptor, not to the entry | |
90 | point. The linker symbol whose name is the C function name | |
91 | prefixed with a '.' points to the function's entry point. So | |
92 | when we look through this table, we ignore symbols that point | |
93 | into the data section (thus skipping the descriptor's symbol), | |
94 | and eventually try this one, giving us the real entry point | |
95 | address. */ | |
96 | "._dl_debug_state", | |
97 | ||
13437d4b KB |
98 | NULL |
99 | }; | |
13437d4b KB |
100 | |
101 | #define BKPT_AT_SYMBOL 1 | |
102 | ||
ab31aa69 | 103 | #if defined (BKPT_AT_SYMBOL) |
13437d4b KB |
104 | static char *bkpt_names[] = |
105 | { | |
106 | #ifdef SOLIB_BKPT_NAME | |
107 | SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ | |
108 | #endif | |
109 | "_start", | |
ad3dcc5c | 110 | "__start", |
13437d4b KB |
111 | "main", |
112 | NULL | |
113 | }; | |
114 | #endif | |
115 | ||
13437d4b KB |
116 | static char *main_name_list[] = |
117 | { | |
118 | "main_$main", | |
119 | NULL | |
120 | }; | |
121 | ||
ae0167b9 AC |
122 | /* Macro to extract an address from a solib structure. When GDB is |
123 | configured for some 32-bit targets (e.g. Solaris 2.7 sparc), BFD is | |
124 | configured to handle 64-bit targets, so CORE_ADDR is 64 bits. We | |
125 | have to extract only the significant bits of addresses to get the | |
126 | right address when accessing the core file BFD. | |
127 | ||
128 | Assume that the address is unsigned. */ | |
13437d4b KB |
129 | |
130 | #define SOLIB_EXTRACT_ADDRESS(MEMBER) \ | |
ae0167b9 | 131 | extract_unsigned_integer (&(MEMBER), sizeof (MEMBER)) |
13437d4b KB |
132 | |
133 | /* local data declarations */ | |
134 | ||
13437d4b KB |
135 | /* link map access functions */ |
136 | ||
137 | static CORE_ADDR | |
cc10cae3 | 138 | LM_ADDR_FROM_LINK_MAP (struct so_list *so) |
13437d4b | 139 | { |
4b188b9f | 140 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
13437d4b | 141 | |
cc10cae3 AO |
142 | return (CORE_ADDR) extract_signed_integer (so->lm_info->lm |
143 | + lmo->l_addr_offset, | |
58bc91c9 | 144 | lmo->l_addr_size); |
13437d4b KB |
145 | } |
146 | ||
cc10cae3 AO |
147 | static int |
148 | HAS_LM_DYNAMIC_FROM_LINK_MAP () | |
149 | { | |
150 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
151 | ||
152 | return (lmo->l_ld_size != 0); | |
153 | } | |
154 | ||
155 | static CORE_ADDR | |
156 | LM_DYNAMIC_FROM_LINK_MAP (struct so_list *so) | |
157 | { | |
158 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
159 | ||
160 | gdb_assert (lmo->l_ld_size != 0); | |
161 | ||
162 | return (CORE_ADDR) extract_signed_integer (so->lm_info->lm | |
163 | + lmo->l_ld_offset, | |
164 | lmo->l_ld_size); | |
165 | } | |
166 | ||
167 | static CORE_ADDR | |
168 | LM_ADDR_CHECK (struct so_list *so, bfd *abfd) | |
169 | { | |
170 | if (so->lm_info->l_addr == (CORE_ADDR)-1) | |
171 | { | |
172 | struct bfd_section *dyninfo_sect; | |
173 | CORE_ADDR l_addr, l_dynaddr, dynaddr, align = 0x1000; | |
174 | ||
175 | l_addr = LM_ADDR_FROM_LINK_MAP (so); | |
176 | ||
177 | if (! abfd || ! HAS_LM_DYNAMIC_FROM_LINK_MAP ()) | |
178 | goto set_addr; | |
179 | ||
180 | l_dynaddr = LM_DYNAMIC_FROM_LINK_MAP (so); | |
181 | ||
182 | dyninfo_sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
183 | if (dyninfo_sect == NULL) | |
184 | goto set_addr; | |
185 | ||
186 | dynaddr = bfd_section_vma (abfd, dyninfo_sect); | |
187 | ||
188 | if (dynaddr + l_addr != l_dynaddr) | |
189 | { | |
cc10cae3 AO |
190 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
191 | { | |
192 | Elf_Internal_Ehdr *ehdr = elf_tdata (abfd)->elf_header; | |
193 | Elf_Internal_Phdr *phdr = elf_tdata (abfd)->phdr; | |
194 | int i; | |
195 | ||
196 | align = 1; | |
197 | ||
198 | for (i = 0; i < ehdr->e_phnum; i++) | |
199 | if (phdr[i].p_type == PT_LOAD && phdr[i].p_align > align) | |
200 | align = phdr[i].p_align; | |
201 | } | |
202 | ||
203 | /* Turn it into a mask. */ | |
204 | align--; | |
205 | ||
206 | /* If the changes match the alignment requirements, we | |
207 | assume we're using a core file that was generated by the | |
208 | same binary, just prelinked with a different base offset. | |
209 | If it doesn't match, we may have a different binary, the | |
210 | same binary with the dynamic table loaded at an unrelated | |
211 | location, or anything, really. To avoid regressions, | |
212 | don't adjust the base offset in the latter case, although | |
213 | odds are that, if things really changed, debugging won't | |
214 | quite work. */ | |
215 | if ((l_addr & align) == 0 && ((dynaddr - l_dynaddr) & align) == 0) | |
216 | { | |
217 | l_addr = l_dynaddr - dynaddr; | |
79d4c408 DJ |
218 | |
219 | warning (_(".dynamic section for \"%s\" " | |
220 | "is not at the expected address"), so->so_name); | |
cc10cae3 AO |
221 | warning (_("difference appears to be caused by prelink, " |
222 | "adjusting expectations")); | |
223 | } | |
79d4c408 DJ |
224 | else |
225 | warning (_(".dynamic section for \"%s\" " | |
226 | "is not at the expected address " | |
227 | "(wrong library or version mismatch?)"), so->so_name); | |
cc10cae3 AO |
228 | } |
229 | ||
230 | set_addr: | |
231 | so->lm_info->l_addr = l_addr; | |
232 | } | |
233 | ||
234 | return so->lm_info->l_addr; | |
235 | } | |
236 | ||
13437d4b KB |
237 | static CORE_ADDR |
238 | LM_NEXT (struct so_list *so) | |
239 | { | |
4b188b9f | 240 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
13437d4b | 241 | |
ae0167b9 AC |
242 | /* Assume that the address is unsigned. */ |
243 | return extract_unsigned_integer (so->lm_info->lm + lmo->l_next_offset, | |
244 | lmo->l_next_size); | |
13437d4b KB |
245 | } |
246 | ||
247 | static CORE_ADDR | |
248 | LM_NAME (struct so_list *so) | |
249 | { | |
4b188b9f | 250 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
13437d4b | 251 | |
ae0167b9 AC |
252 | /* Assume that the address is unsigned. */ |
253 | return extract_unsigned_integer (so->lm_info->lm + lmo->l_name_offset, | |
254 | lmo->l_name_size); | |
13437d4b KB |
255 | } |
256 | ||
13437d4b KB |
257 | static int |
258 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
259 | { | |
4b188b9f | 260 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
13437d4b | 261 | |
ae0167b9 AC |
262 | /* Assume that the address is unsigned. */ |
263 | return extract_unsigned_integer (so->lm_info->lm + lmo->l_prev_offset, | |
264 | lmo->l_prev_size) == 0; | |
13437d4b KB |
265 | } |
266 | ||
13437d4b KB |
267 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
268 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
269 | ||
270 | /* Local function prototypes */ | |
271 | ||
272 | static int match_main (char *); | |
273 | ||
87f84c9d | 274 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *, flagword); |
13437d4b KB |
275 | |
276 | /* | |
277 | ||
278 | LOCAL FUNCTION | |
279 | ||
280 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
281 | ||
282 | SYNOPSIS | |
283 | ||
87f84c9d | 284 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname, flagword sect_flags) |
13437d4b KB |
285 | |
286 | DESCRIPTION | |
287 | ||
288 | An expensive way to lookup the value of a single symbol for | |
289 | bfd's that are only temporary anyway. This is used by the | |
290 | shared library support to find the address of the debugger | |
291 | interface structures in the shared library. | |
292 | ||
87f84c9d JB |
293 | If SECT_FLAGS is non-zero, only match symbols in sections whose |
294 | flags include all those in SECT_FLAGS. | |
295 | ||
13437d4b KB |
296 | Note that 0 is specifically allowed as an error return (no |
297 | such symbol). | |
298 | */ | |
299 | ||
300 | static CORE_ADDR | |
87f84c9d | 301 | bfd_lookup_symbol (bfd *abfd, char *symname, flagword sect_flags) |
13437d4b | 302 | { |
435b259c | 303 | long storage_needed; |
13437d4b KB |
304 | asymbol *sym; |
305 | asymbol **symbol_table; | |
306 | unsigned int number_of_symbols; | |
307 | unsigned int i; | |
308 | struct cleanup *back_to; | |
309 | CORE_ADDR symaddr = 0; | |
310 | ||
311 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
312 | ||
313 | if (storage_needed > 0) | |
314 | { | |
315 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 316 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
317 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
318 | ||
319 | for (i = 0; i < number_of_symbols; i++) | |
320 | { | |
321 | sym = *symbol_table++; | |
6314a349 | 322 | if (strcmp (sym->name, symname) == 0 |
87f84c9d | 323 | && (sym->section->flags & sect_flags) == sect_flags) |
13437d4b KB |
324 | { |
325 | /* Bfd symbols are section relative. */ | |
326 | symaddr = sym->value + sym->section->vma; | |
327 | break; | |
328 | } | |
329 | } | |
330 | do_cleanups (back_to); | |
331 | } | |
332 | ||
333 | if (symaddr) | |
334 | return symaddr; | |
335 | ||
336 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll | |
337 | have to check the dynamic string table too. */ | |
338 | ||
339 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
340 | ||
341 | if (storage_needed > 0) | |
342 | { | |
343 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
4efb68b1 | 344 | back_to = make_cleanup (xfree, symbol_table); |
13437d4b KB |
345 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table); |
346 | ||
347 | for (i = 0; i < number_of_symbols; i++) | |
348 | { | |
349 | sym = *symbol_table++; | |
87f84c9d | 350 | |
6314a349 | 351 | if (strcmp (sym->name, symname) == 0 |
87f84c9d | 352 | && (sym->section->flags & sect_flags) == sect_flags) |
13437d4b KB |
353 | { |
354 | /* Bfd symbols are section relative. */ | |
355 | symaddr = sym->value + sym->section->vma; | |
356 | break; | |
357 | } | |
358 | } | |
359 | do_cleanups (back_to); | |
360 | } | |
361 | ||
362 | return symaddr; | |
363 | } | |
364 | ||
13437d4b KB |
365 | /* |
366 | ||
367 | LOCAL FUNCTION | |
368 | ||
369 | elf_locate_base -- locate the base address of dynamic linker structs | |
370 | for SVR4 elf targets. | |
371 | ||
372 | SYNOPSIS | |
373 | ||
374 | CORE_ADDR elf_locate_base (void) | |
375 | ||
376 | DESCRIPTION | |
377 | ||
378 | For SVR4 elf targets the address of the dynamic linker's runtime | |
379 | structure is contained within the dynamic info section in the | |
380 | executable file. The dynamic section is also mapped into the | |
381 | inferior address space. Because the runtime loader fills in the | |
382 | real address before starting the inferior, we have to read in the | |
383 | dynamic info section from the inferior address space. | |
384 | If there are any errors while trying to find the address, we | |
385 | silently return 0, otherwise the found address is returned. | |
386 | ||
387 | */ | |
388 | ||
389 | static CORE_ADDR | |
390 | elf_locate_base (void) | |
391 | { | |
7be0c536 | 392 | struct bfd_section *dyninfo_sect; |
13437d4b KB |
393 | int dyninfo_sect_size; |
394 | CORE_ADDR dyninfo_addr; | |
4066fc10 MI |
395 | gdb_byte *buf; |
396 | gdb_byte *bufend; | |
13437d4b KB |
397 | int arch_size; |
398 | ||
399 | /* Find the start address of the .dynamic section. */ | |
400 | dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); | |
401 | if (dyninfo_sect == NULL) | |
402 | return 0; | |
403 | dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); | |
404 | ||
405 | /* Read in .dynamic section, silently ignore errors. */ | |
406 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); | |
407 | buf = alloca (dyninfo_sect_size); | |
408 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
409 | return 0; | |
410 | ||
411 | /* Find the DT_DEBUG entry in the the .dynamic section. | |
412 | For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has | |
413 | no DT_DEBUG entries. */ | |
414 | ||
415 | arch_size = bfd_get_arch_size (exec_bfd); | |
416 | if (arch_size == -1) /* failure */ | |
417 | return 0; | |
418 | ||
419 | if (arch_size == 32) | |
420 | { /* 32-bit elf */ | |
421 | for (bufend = buf + dyninfo_sect_size; | |
422 | buf < bufend; | |
423 | buf += sizeof (Elf32_External_Dyn)) | |
424 | { | |
425 | Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf; | |
426 | long dyn_tag; | |
427 | CORE_ADDR dyn_ptr; | |
428 | ||
429 | dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
430 | if (dyn_tag == DT_NULL) | |
431 | break; | |
432 | else if (dyn_tag == DT_DEBUG) | |
433 | { | |
434 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
435 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
436 | return dyn_ptr; | |
437 | } | |
13437d4b KB |
438 | else if (dyn_tag == DT_MIPS_RLD_MAP) |
439 | { | |
4066fc10 | 440 | gdb_byte *pbuf; |
743b930b | 441 | int pbuf_size = TARGET_PTR_BIT / HOST_CHAR_BIT; |
13437d4b | 442 | |
743b930b | 443 | pbuf = alloca (pbuf_size); |
13437d4b KB |
444 | /* DT_MIPS_RLD_MAP contains a pointer to the address |
445 | of the dynamic link structure. */ | |
446 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
447 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
743b930b | 448 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) |
13437d4b | 449 | return 0; |
743b930b | 450 | return extract_unsigned_integer (pbuf, pbuf_size); |
13437d4b | 451 | } |
13437d4b KB |
452 | } |
453 | } | |
454 | else /* 64-bit elf */ | |
455 | { | |
456 | for (bufend = buf + dyninfo_sect_size; | |
457 | buf < bufend; | |
458 | buf += sizeof (Elf64_External_Dyn)) | |
459 | { | |
460 | Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf; | |
461 | long dyn_tag; | |
462 | CORE_ADDR dyn_ptr; | |
463 | ||
464 | dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
465 | if (dyn_tag == DT_NULL) | |
466 | break; | |
467 | else if (dyn_tag == DT_DEBUG) | |
468 | { | |
469 | dyn_ptr = bfd_h_get_64 (exec_bfd, | |
470 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
471 | return dyn_ptr; | |
472 | } | |
743b930b KB |
473 | else if (dyn_tag == DT_MIPS_RLD_MAP) |
474 | { | |
4066fc10 | 475 | gdb_byte *pbuf; |
743b930b KB |
476 | int pbuf_size = TARGET_PTR_BIT / HOST_CHAR_BIT; |
477 | ||
478 | pbuf = alloca (pbuf_size); | |
479 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
480 | of the dynamic link structure. */ | |
481 | dyn_ptr = bfd_h_get_64 (exec_bfd, | |
482 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
483 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) | |
484 | return 0; | |
485 | return extract_unsigned_integer (pbuf, pbuf_size); | |
486 | } | |
13437d4b KB |
487 | } |
488 | } | |
489 | ||
490 | /* DT_DEBUG entry not found. */ | |
491 | return 0; | |
492 | } | |
493 | ||
13437d4b KB |
494 | /* |
495 | ||
496 | LOCAL FUNCTION | |
497 | ||
498 | locate_base -- locate the base address of dynamic linker structs | |
499 | ||
500 | SYNOPSIS | |
501 | ||
502 | CORE_ADDR locate_base (void) | |
503 | ||
504 | DESCRIPTION | |
505 | ||
506 | For both the SunOS and SVR4 shared library implementations, if the | |
507 | inferior executable has been linked dynamically, there is a single | |
508 | address somewhere in the inferior's data space which is the key to | |
509 | locating all of the dynamic linker's runtime structures. This | |
510 | address is the value of the debug base symbol. The job of this | |
511 | function is to find and return that address, or to return 0 if there | |
512 | is no such address (the executable is statically linked for example). | |
513 | ||
514 | For SunOS, the job is almost trivial, since the dynamic linker and | |
515 | all of it's structures are statically linked to the executable at | |
516 | link time. Thus the symbol for the address we are looking for has | |
517 | already been added to the minimal symbol table for the executable's | |
518 | objfile at the time the symbol file's symbols were read, and all we | |
519 | have to do is look it up there. Note that we explicitly do NOT want | |
520 | to find the copies in the shared library. | |
521 | ||
522 | The SVR4 version is a bit more complicated because the address | |
523 | is contained somewhere in the dynamic info section. We have to go | |
524 | to a lot more work to discover the address of the debug base symbol. | |
525 | Because of this complexity, we cache the value we find and return that | |
526 | value on subsequent invocations. Note there is no copy in the | |
527 | executable symbol tables. | |
528 | ||
529 | */ | |
530 | ||
531 | static CORE_ADDR | |
532 | locate_base (void) | |
533 | { | |
13437d4b KB |
534 | /* Check to see if we have a currently valid address, and if so, avoid |
535 | doing all this work again and just return the cached address. If | |
536 | we have no cached address, try to locate it in the dynamic info | |
d5a921c9 KB |
537 | section for ELF executables. There's no point in doing any of this |
538 | though if we don't have some link map offsets to work with. */ | |
13437d4b | 539 | |
d5a921c9 | 540 | if (debug_base == 0 && svr4_have_link_map_offsets ()) |
13437d4b KB |
541 | { |
542 | if (exec_bfd != NULL | |
543 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
544 | debug_base = elf_locate_base (); | |
13437d4b KB |
545 | } |
546 | return (debug_base); | |
13437d4b KB |
547 | } |
548 | ||
e4cd0d6a MK |
549 | /* Find the first element in the inferior's dynamic link map, and |
550 | return its address in the inferior. | |
13437d4b | 551 | |
e4cd0d6a MK |
552 | FIXME: Perhaps we should validate the info somehow, perhaps by |
553 | checking r_version for a known version number, or r_state for | |
554 | RT_CONSISTENT. */ | |
13437d4b KB |
555 | |
556 | static CORE_ADDR | |
e4cd0d6a | 557 | solib_svr4_r_map (void) |
13437d4b | 558 | { |
4b188b9f | 559 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
13437d4b | 560 | |
e4cd0d6a MK |
561 | return read_memory_typed_address (debug_base + lmo->r_map_offset, |
562 | builtin_type_void_data_ptr); | |
563 | } | |
13437d4b | 564 | |
e4cd0d6a MK |
565 | /* Find the link map for the dynamic linker (if it is not in the |
566 | normal list of loaded shared objects). */ | |
13437d4b | 567 | |
e4cd0d6a MK |
568 | static CORE_ADDR |
569 | solib_svr4_r_ldsomap (void) | |
570 | { | |
571 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); | |
572 | ULONGEST version; | |
13437d4b | 573 | |
e4cd0d6a MK |
574 | /* Check version, and return zero if `struct r_debug' doesn't have |
575 | the r_ldsomap member. */ | |
576 | version = read_memory_unsigned_integer (debug_base + lmo->r_version_offset, | |
577 | lmo->r_version_size); | |
578 | if (version < 2 || lmo->r_ldsomap_offset == -1) | |
579 | return 0; | |
13437d4b | 580 | |
e4cd0d6a MK |
581 | return read_memory_typed_address (debug_base + lmo->r_ldsomap_offset, |
582 | builtin_type_void_data_ptr); | |
13437d4b KB |
583 | } |
584 | ||
13437d4b KB |
585 | /* |
586 | ||
587 | LOCAL FUNCTION | |
588 | ||
589 | open_symbol_file_object | |
590 | ||
591 | SYNOPSIS | |
592 | ||
593 | void open_symbol_file_object (void *from_tty) | |
594 | ||
595 | DESCRIPTION | |
596 | ||
597 | If no open symbol file, attempt to locate and open the main symbol | |
598 | file. On SVR4 systems, this is the first link map entry. If its | |
599 | name is here, we can open it. Useful when attaching to a process | |
600 | without first loading its symbol file. | |
601 | ||
602 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |
603 | be printed. This parameter is a pointer rather than an int because | |
604 | open_symbol_file_object() is called via catch_errors() and | |
605 | catch_errors() requires a pointer argument. */ | |
606 | ||
607 | static int | |
608 | open_symbol_file_object (void *from_ttyp) | |
609 | { | |
610 | CORE_ADDR lm, l_name; | |
611 | char *filename; | |
612 | int errcode; | |
613 | int from_tty = *(int *)from_ttyp; | |
4b188b9f | 614 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
4066fc10 | 615 | gdb_byte *l_name_buf = xmalloc (lmo->l_name_size); |
b8c9b27d | 616 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); |
13437d4b KB |
617 | |
618 | if (symfile_objfile) | |
619 | if (!query ("Attempt to reload symbols from process? ")) | |
620 | return 0; | |
621 | ||
622 | if ((debug_base = locate_base ()) == 0) | |
623 | return 0; /* failed somehow... */ | |
624 | ||
625 | /* First link map member should be the executable. */ | |
e4cd0d6a MK |
626 | lm = solib_svr4_r_map (); |
627 | if (lm == 0) | |
13437d4b KB |
628 | return 0; /* failed somehow... */ |
629 | ||
630 | /* Read address of name from target memory to GDB. */ | |
631 | read_memory (lm + lmo->l_name_offset, l_name_buf, lmo->l_name_size); | |
632 | ||
ae0167b9 AC |
633 | /* Convert the address to host format. Assume that the address is |
634 | unsigned. */ | |
635 | l_name = extract_unsigned_integer (l_name_buf, lmo->l_name_size); | |
13437d4b KB |
636 | |
637 | /* Free l_name_buf. */ | |
638 | do_cleanups (cleanups); | |
639 | ||
640 | if (l_name == 0) | |
641 | return 0; /* No filename. */ | |
642 | ||
643 | /* Now fetch the filename from target memory. */ | |
644 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
645 | ||
646 | if (errcode) | |
647 | { | |
8a3fe4f8 | 648 | warning (_("failed to read exec filename from attached file: %s"), |
13437d4b KB |
649 | safe_strerror (errcode)); |
650 | return 0; | |
651 | } | |
652 | ||
b8c9b27d | 653 | make_cleanup (xfree, filename); |
13437d4b | 654 | /* Have a pathname: read the symbol file. */ |
1adeb98a | 655 | symbol_file_add_main (filename, from_tty); |
13437d4b KB |
656 | |
657 | return 1; | |
658 | } | |
13437d4b KB |
659 | |
660 | /* LOCAL FUNCTION | |
661 | ||
662 | current_sos -- build a list of currently loaded shared objects | |
663 | ||
664 | SYNOPSIS | |
665 | ||
666 | struct so_list *current_sos () | |
667 | ||
668 | DESCRIPTION | |
669 | ||
670 | Build a list of `struct so_list' objects describing the shared | |
671 | objects currently loaded in the inferior. This list does not | |
672 | include an entry for the main executable file. | |
673 | ||
674 | Note that we only gather information directly available from the | |
675 | inferior --- we don't examine any of the shared library files | |
676 | themselves. The declaration of `struct so_list' says which fields | |
677 | we provide values for. */ | |
678 | ||
679 | static struct so_list * | |
680 | svr4_current_sos (void) | |
681 | { | |
682 | CORE_ADDR lm; | |
683 | struct so_list *head = 0; | |
684 | struct so_list **link_ptr = &head; | |
e4cd0d6a | 685 | CORE_ADDR ldsomap = 0; |
13437d4b KB |
686 | |
687 | /* Make sure we've looked up the inferior's dynamic linker's base | |
688 | structure. */ | |
689 | if (! debug_base) | |
690 | { | |
691 | debug_base = locate_base (); | |
692 | ||
693 | /* If we can't find the dynamic linker's base structure, this | |
694 | must not be a dynamically linked executable. Hmm. */ | |
695 | if (! debug_base) | |
696 | return 0; | |
697 | } | |
698 | ||
699 | /* Walk the inferior's link map list, and build our list of | |
700 | `struct so_list' nodes. */ | |
e4cd0d6a | 701 | lm = solib_svr4_r_map (); |
13437d4b KB |
702 | while (lm) |
703 | { | |
4b188b9f | 704 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
f4456994 | 705 | struct so_list *new = XZALLOC (struct so_list); |
b8c9b27d | 706 | struct cleanup *old_chain = make_cleanup (xfree, new); |
13437d4b | 707 | |
13437d4b | 708 | new->lm_info = xmalloc (sizeof (struct lm_info)); |
b8c9b27d | 709 | make_cleanup (xfree, new->lm_info); |
13437d4b | 710 | |
831004b7 | 711 | new->lm_info->l_addr = (CORE_ADDR)-1; |
f4456994 | 712 | new->lm_info->lm = xzalloc (lmo->link_map_size); |
b8c9b27d | 713 | make_cleanup (xfree, new->lm_info->lm); |
13437d4b KB |
714 | |
715 | read_memory (lm, new->lm_info->lm, lmo->link_map_size); | |
716 | ||
717 | lm = LM_NEXT (new); | |
718 | ||
719 | /* For SVR4 versions, the first entry in the link map is for the | |
720 | inferior executable, so we must ignore it. For some versions of | |
721 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
722 | does have a name, so we can no longer use a missing name to | |
723 | decide when to ignore it. */ | |
e4cd0d6a | 724 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new) && ldsomap == 0) |
13437d4b KB |
725 | free_so (new); |
726 | else | |
727 | { | |
728 | int errcode; | |
729 | char *buffer; | |
730 | ||
731 | /* Extract this shared object's name. */ | |
732 | target_read_string (LM_NAME (new), &buffer, | |
733 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
734 | if (errcode != 0) | |
8a3fe4f8 AC |
735 | warning (_("Can't read pathname for load map: %s."), |
736 | safe_strerror (errcode)); | |
13437d4b KB |
737 | else |
738 | { | |
739 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); | |
740 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
b8c9b27d | 741 | xfree (buffer); |
13437d4b KB |
742 | strcpy (new->so_original_name, new->so_name); |
743 | } | |
744 | ||
745 | /* If this entry has no name, or its name matches the name | |
746 | for the main executable, don't include it in the list. */ | |
747 | if (! new->so_name[0] | |
748 | || match_main (new->so_name)) | |
749 | free_so (new); | |
750 | else | |
751 | { | |
752 | new->next = 0; | |
753 | *link_ptr = new; | |
754 | link_ptr = &new->next; | |
755 | } | |
756 | } | |
757 | ||
e4cd0d6a MK |
758 | /* On Solaris, the dynamic linker is not in the normal list of |
759 | shared objects, so make sure we pick it up too. Having | |
760 | symbol information for the dynamic linker is quite crucial | |
761 | for skipping dynamic linker resolver code. */ | |
762 | if (lm == 0 && ldsomap == 0) | |
763 | lm = ldsomap = solib_svr4_r_ldsomap (); | |
764 | ||
13437d4b KB |
765 | discard_cleanups (old_chain); |
766 | } | |
767 | ||
768 | return head; | |
769 | } | |
770 | ||
bc4a16ae EZ |
771 | /* Get the address of the link_map for a given OBJFILE. Loop through |
772 | the link maps, and return the address of the one corresponding to | |
773 | the given objfile. Note that this function takes into account that | |
774 | objfile can be the main executable, not just a shared library. The | |
775 | main executable has always an empty name field in the linkmap. */ | |
776 | ||
777 | CORE_ADDR | |
778 | svr4_fetch_objfile_link_map (struct objfile *objfile) | |
779 | { | |
780 | CORE_ADDR lm; | |
781 | ||
782 | if ((debug_base = locate_base ()) == 0) | |
783 | return 0; /* failed somehow... */ | |
784 | ||
785 | /* Position ourselves on the first link map. */ | |
e4cd0d6a | 786 | lm = solib_svr4_r_map (); |
bc4a16ae EZ |
787 | while (lm) |
788 | { | |
789 | /* Get info on the layout of the r_debug and link_map structures. */ | |
4b188b9f | 790 | struct link_map_offsets *lmo = svr4_fetch_link_map_offsets (); |
bc4a16ae EZ |
791 | int errcode; |
792 | char *buffer; | |
793 | struct lm_info objfile_lm_info; | |
794 | struct cleanup *old_chain; | |
795 | CORE_ADDR name_address; | |
4066fc10 | 796 | gdb_byte *l_name_buf = xmalloc (lmo->l_name_size); |
bc4a16ae EZ |
797 | old_chain = make_cleanup (xfree, l_name_buf); |
798 | ||
799 | /* Set up the buffer to contain the portion of the link_map | |
800 | structure that gdb cares about. Note that this is not the | |
801 | whole link_map structure. */ | |
f4456994 | 802 | objfile_lm_info.lm = xzalloc (lmo->link_map_size); |
bc4a16ae | 803 | make_cleanup (xfree, objfile_lm_info.lm); |
bc4a16ae EZ |
804 | |
805 | /* Read the link map into our internal structure. */ | |
806 | read_memory (lm, objfile_lm_info.lm, lmo->link_map_size); | |
807 | ||
808 | /* Read address of name from target memory to GDB. */ | |
809 | read_memory (lm + lmo->l_name_offset, l_name_buf, lmo->l_name_size); | |
810 | ||
ae0167b9 AC |
811 | /* Extract this object's name. Assume that the address is |
812 | unsigned. */ | |
813 | name_address = extract_unsigned_integer (l_name_buf, lmo->l_name_size); | |
bc4a16ae EZ |
814 | target_read_string (name_address, &buffer, |
815 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
816 | make_cleanup (xfree, buffer); | |
817 | if (errcode != 0) | |
8a3fe4f8 AC |
818 | warning (_("Can't read pathname for load map: %s."), |
819 | safe_strerror (errcode)); | |
bc4a16ae EZ |
820 | else |
821 | { | |
822 | /* Is this the linkmap for the file we want? */ | |
823 | /* If the file is not a shared library and has no name, | |
824 | we are sure it is the main executable, so we return that. */ | |
825 | if ((buffer && strcmp (buffer, objfile->name) == 0) | |
826 | || (!(objfile->flags & OBJF_SHARED) && (strcmp (buffer, "") == 0))) | |
827 | { | |
828 | do_cleanups (old_chain); | |
829 | return lm; | |
830 | } | |
831 | } | |
ae0167b9 AC |
832 | /* Not the file we wanted, continue checking. Assume that the |
833 | address is unsigned. */ | |
834 | lm = extract_unsigned_integer (objfile_lm_info.lm + lmo->l_next_offset, | |
835 | lmo->l_next_size); | |
bc4a16ae EZ |
836 | do_cleanups (old_chain); |
837 | } | |
838 | return 0; | |
839 | } | |
13437d4b KB |
840 | |
841 | /* On some systems, the only way to recognize the link map entry for | |
842 | the main executable file is by looking at its name. Return | |
843 | non-zero iff SONAME matches one of the known main executable names. */ | |
844 | ||
845 | static int | |
846 | match_main (char *soname) | |
847 | { | |
848 | char **mainp; | |
849 | ||
850 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
851 | { | |
852 | if (strcmp (soname, *mainp) == 0) | |
853 | return (1); | |
854 | } | |
855 | ||
856 | return (0); | |
857 | } | |
858 | ||
13437d4b KB |
859 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
860 | SVR4 run time loader. */ | |
13437d4b KB |
861 | static CORE_ADDR interp_text_sect_low; |
862 | static CORE_ADDR interp_text_sect_high; | |
863 | static CORE_ADDR interp_plt_sect_low; | |
864 | static CORE_ADDR interp_plt_sect_high; | |
865 | ||
d7fa2ae2 KB |
866 | static int |
867 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) | |
13437d4b KB |
868 | { |
869 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
870 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
871 | || in_plt_section (pc, NULL)); | |
872 | } | |
13437d4b | 873 | |
2f4950cd AC |
874 | /* Given an executable's ABFD and target, compute the entry-point |
875 | address. */ | |
876 | ||
877 | static CORE_ADDR | |
878 | exec_entry_point (struct bfd *abfd, struct target_ops *targ) | |
879 | { | |
880 | /* KevinB wrote ... for most targets, the address returned by | |
881 | bfd_get_start_address() is the entry point for the start | |
882 | function. But, for some targets, bfd_get_start_address() returns | |
883 | the address of a function descriptor from which the entry point | |
884 | address may be extracted. This address is extracted by | |
885 | gdbarch_convert_from_func_ptr_addr(). The method | |
886 | gdbarch_convert_from_func_ptr_addr() is the merely the identify | |
887 | function for targets which don't use function descriptors. */ | |
888 | return gdbarch_convert_from_func_ptr_addr (current_gdbarch, | |
889 | bfd_get_start_address (abfd), | |
890 | targ); | |
891 | } | |
13437d4b KB |
892 | |
893 | /* | |
894 | ||
895 | LOCAL FUNCTION | |
896 | ||
897 | enable_break -- arrange for dynamic linker to hit breakpoint | |
898 | ||
899 | SYNOPSIS | |
900 | ||
901 | int enable_break (void) | |
902 | ||
903 | DESCRIPTION | |
904 | ||
905 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
906 | debugger interface, support for arranging for the inferior to hit | |
907 | a breakpoint after mapping in the shared libraries. This function | |
908 | enables that breakpoint. | |
909 | ||
910 | For SunOS, there is a special flag location (in_debugger) which we | |
911 | set to 1. When the dynamic linker sees this flag set, it will set | |
912 | a breakpoint at a location known only to itself, after saving the | |
913 | original contents of that place and the breakpoint address itself, | |
914 | in it's own internal structures. When we resume the inferior, it | |
915 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
916 | We handle this (in a different place) by restoring the contents of | |
917 | the breakpointed location (which is only known after it stops), | |
918 | chasing around to locate the shared libraries that have been | |
919 | loaded, then resuming. | |
920 | ||
921 | For SVR4, the debugger interface structure contains a member (r_brk) | |
922 | which is statically initialized at the time the shared library is | |
923 | built, to the offset of a function (_r_debug_state) which is guaran- | |
924 | teed to be called once before mapping in a library, and again when | |
925 | the mapping is complete. At the time we are examining this member, | |
926 | it contains only the unrelocated offset of the function, so we have | |
927 | to do our own relocation. Later, when the dynamic linker actually | |
928 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
929 | ||
930 | The debugger interface structure also contains an enumeration which | |
931 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
932 | depending upon whether or not the library is being mapped or unmapped, | |
933 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
934 | */ | |
935 | ||
936 | static int | |
937 | enable_break (void) | |
938 | { | |
939 | int success = 0; | |
940 | ||
13437d4b KB |
941 | #ifdef BKPT_AT_SYMBOL |
942 | ||
943 | struct minimal_symbol *msymbol; | |
944 | char **bkpt_namep; | |
945 | asection *interp_sect; | |
946 | ||
947 | /* First, remove all the solib event breakpoints. Their addresses | |
948 | may have changed since the last time we ran the program. */ | |
949 | remove_solib_event_breakpoints (); | |
950 | ||
13437d4b KB |
951 | interp_text_sect_low = interp_text_sect_high = 0; |
952 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
953 | ||
954 | /* Find the .interp section; if not found, warn the user and drop | |
955 | into the old breakpoint at symbol code. */ | |
956 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
957 | if (interp_sect) | |
958 | { | |
959 | unsigned int interp_sect_size; | |
960 | char *buf; | |
8ad2fcde KB |
961 | CORE_ADDR load_addr = 0; |
962 | int load_addr_found = 0; | |
f8766ec1 | 963 | struct so_list *so; |
e4f7b8c8 | 964 | bfd *tmp_bfd = NULL; |
2f4950cd | 965 | struct target_ops *tmp_bfd_target; |
e4f7b8c8 MS |
966 | int tmp_fd = -1; |
967 | char *tmp_pathname = NULL; | |
13437d4b KB |
968 | CORE_ADDR sym_addr = 0; |
969 | ||
970 | /* Read the contents of the .interp section into a local buffer; | |
971 | the contents specify the dynamic linker this program uses. */ | |
972 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); | |
973 | buf = alloca (interp_sect_size); | |
974 | bfd_get_section_contents (exec_bfd, interp_sect, | |
975 | buf, 0, interp_sect_size); | |
976 | ||
977 | /* Now we need to figure out where the dynamic linker was | |
978 | loaded so that we can load its symbols and place a breakpoint | |
979 | in the dynamic linker itself. | |
980 | ||
981 | This address is stored on the stack. However, I've been unable | |
982 | to find any magic formula to find it for Solaris (appears to | |
983 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
984 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 MS |
985 | |
986 | tmp_fd = solib_open (buf, &tmp_pathname); | |
987 | if (tmp_fd >= 0) | |
9f76c2cd | 988 | tmp_bfd = bfd_fopen (tmp_pathname, gnutarget, FOPEN_RB, tmp_fd); |
e4f7b8c8 | 989 | |
13437d4b KB |
990 | if (tmp_bfd == NULL) |
991 | goto bkpt_at_symbol; | |
992 | ||
993 | /* Make sure the dynamic linker's really a useful object. */ | |
994 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
995 | { | |
8a3fe4f8 | 996 | warning (_("Unable to grok dynamic linker %s as an object file"), buf); |
13437d4b KB |
997 | bfd_close (tmp_bfd); |
998 | goto bkpt_at_symbol; | |
999 | } | |
1000 | ||
2f4950cd AC |
1001 | /* Now convert the TMP_BFD into a target. That way target, as |
1002 | well as BFD operations can be used. Note that closing the | |
1003 | target will also close the underlying bfd. */ | |
1004 | tmp_bfd_target = target_bfd_reopen (tmp_bfd); | |
1005 | ||
f8766ec1 KB |
1006 | /* On a running target, we can get the dynamic linker's base |
1007 | address from the shared library table. */ | |
1008 | solib_add (NULL, 0, NULL, auto_solib_add); | |
1009 | so = master_so_list (); | |
1010 | while (so) | |
8ad2fcde | 1011 | { |
f8766ec1 | 1012 | if (strcmp (buf, so->so_original_name) == 0) |
8ad2fcde KB |
1013 | { |
1014 | load_addr_found = 1; | |
cc10cae3 | 1015 | load_addr = LM_ADDR_CHECK (so, tmp_bfd); |
8ad2fcde KB |
1016 | break; |
1017 | } | |
f8766ec1 | 1018 | so = so->next; |
8ad2fcde KB |
1019 | } |
1020 | ||
1021 | /* Otherwise we find the dynamic linker's base address by examining | |
1022 | the current pc (which should point at the entry point for the | |
1023 | dynamic linker) and subtracting the offset of the entry point. */ | |
1024 | if (!load_addr_found) | |
2f4950cd AC |
1025 | load_addr = (read_pc () |
1026 | - exec_entry_point (tmp_bfd, tmp_bfd_target)); | |
13437d4b KB |
1027 | |
1028 | /* Record the relocated start and end address of the dynamic linker | |
d7fa2ae2 | 1029 | text and plt section for svr4_in_dynsym_resolve_code. */ |
13437d4b KB |
1030 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1031 | if (interp_sect) | |
1032 | { | |
1033 | interp_text_sect_low = | |
1034 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1035 | interp_text_sect_high = | |
1036 | interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1037 | } | |
1038 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1039 | if (interp_sect) | |
1040 | { | |
1041 | interp_plt_sect_low = | |
1042 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1043 | interp_plt_sect_high = | |
1044 | interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1045 | } | |
1046 | ||
1047 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1048 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1049 | { | |
87f84c9d JB |
1050 | /* On ABI's that use function descriptors, there are usually |
1051 | two linker symbols associated with each C function: one | |
1052 | pointing at the actual entry point of the machine code, | |
1053 | and one pointing at the function's descriptor. The | |
1054 | latter symbol has the same name as the C function. | |
1055 | ||
1056 | What we're looking for here is the machine code entry | |
1057 | point, so we are only interested in symbols in code | |
1058 | sections. */ | |
1059 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep, SEC_CODE); | |
13437d4b KB |
1060 | if (sym_addr != 0) |
1061 | break; | |
1062 | } | |
1063 | ||
2f4950cd AC |
1064 | /* We're done with both the temporary bfd and target. Remember, |
1065 | closing the target closes the underlying bfd. */ | |
1066 | target_close (tmp_bfd_target, 0); | |
13437d4b KB |
1067 | |
1068 | if (sym_addr != 0) | |
1069 | { | |
1070 | create_solib_event_breakpoint (load_addr + sym_addr); | |
1071 | return 1; | |
1072 | } | |
1073 | ||
1074 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1075 | linker. Warn and drop into the old code. */ | |
1076 | bkpt_at_symbol: | |
82d03102 PG |
1077 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
1078 | "GDB will be unable to debug shared library initializers\n" | |
1079 | "and track explicitly loaded dynamic code.")); | |
13437d4b | 1080 | } |
13437d4b KB |
1081 | |
1082 | /* Scan through the list of symbols, trying to look up the symbol and | |
1083 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1084 | ||
1085 | breakpoint_addr = 0; | |
1086 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
1087 | { | |
1088 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1089 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1090 | { | |
1091 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); | |
1092 | return 1; | |
1093 | } | |
1094 | } | |
1095 | ||
1096 | /* Nothing good happened. */ | |
1097 | success = 0; | |
1098 | ||
1099 | #endif /* BKPT_AT_SYMBOL */ | |
1100 | ||
13437d4b KB |
1101 | return (success); |
1102 | } | |
1103 | ||
1104 | /* | |
1105 | ||
1106 | LOCAL FUNCTION | |
1107 | ||
1108 | special_symbol_handling -- additional shared library symbol handling | |
1109 | ||
1110 | SYNOPSIS | |
1111 | ||
1112 | void special_symbol_handling () | |
1113 | ||
1114 | DESCRIPTION | |
1115 | ||
1116 | Once the symbols from a shared object have been loaded in the usual | |
1117 | way, we are called to do any system specific symbol handling that | |
1118 | is needed. | |
1119 | ||
ab31aa69 | 1120 | For SunOS4, this consisted of grunging around in the dynamic |
13437d4b KB |
1121 | linkers structures to find symbol definitions for "common" symbols |
1122 | and adding them to the minimal symbol table for the runtime common | |
1123 | objfile. | |
1124 | ||
ab31aa69 KB |
1125 | However, for SVR4, there's nothing to do. |
1126 | ||
13437d4b KB |
1127 | */ |
1128 | ||
1129 | static void | |
1130 | svr4_special_symbol_handling (void) | |
1131 | { | |
13437d4b KB |
1132 | } |
1133 | ||
e2a44558 KB |
1134 | /* Relocate the main executable. This function should be called upon |
1135 | stopping the inferior process at the entry point to the program. | |
1136 | The entry point from BFD is compared to the PC and if they are | |
1137 | different, the main executable is relocated by the proper amount. | |
1138 | ||
1139 | As written it will only attempt to relocate executables which | |
1140 | lack interpreter sections. It seems likely that only dynamic | |
1141 | linker executables will get relocated, though it should work | |
1142 | properly for a position-independent static executable as well. */ | |
1143 | ||
1144 | static void | |
1145 | svr4_relocate_main_executable (void) | |
1146 | { | |
1147 | asection *interp_sect; | |
1148 | CORE_ADDR pc = read_pc (); | |
1149 | ||
1150 | /* Decide if the objfile needs to be relocated. As indicated above, | |
1151 | we will only be here when execution is stopped at the beginning | |
1152 | of the program. Relocation is necessary if the address at which | |
1153 | we are presently stopped differs from the start address stored in | |
1154 | the executable AND there's no interpreter section. The condition | |
1155 | regarding the interpreter section is very important because if | |
1156 | there *is* an interpreter section, execution will begin there | |
1157 | instead. When there is an interpreter section, the start address | |
1158 | is (presumably) used by the interpreter at some point to start | |
1159 | execution of the program. | |
1160 | ||
1161 | If there is an interpreter, it is normal for it to be set to an | |
1162 | arbitrary address at the outset. The job of finding it is | |
1163 | handled in enable_break(). | |
1164 | ||
1165 | So, to summarize, relocations are necessary when there is no | |
1166 | interpreter section and the start address obtained from the | |
1167 | executable is different from the address at which GDB is | |
1168 | currently stopped. | |
1169 | ||
1170 | [ The astute reader will note that we also test to make sure that | |
1171 | the executable in question has the DYNAMIC flag set. It is my | |
1172 | opinion that this test is unnecessary (undesirable even). It | |
1173 | was added to avoid inadvertent relocation of an executable | |
1174 | whose e_type member in the ELF header is not ET_DYN. There may | |
1175 | be a time in the future when it is desirable to do relocations | |
1176 | on other types of files as well in which case this condition | |
1177 | should either be removed or modified to accomodate the new file | |
1178 | type. (E.g, an ET_EXEC executable which has been built to be | |
1179 | position-independent could safely be relocated by the OS if | |
1180 | desired. It is true that this violates the ABI, but the ABI | |
1181 | has been known to be bent from time to time.) - Kevin, Nov 2000. ] | |
1182 | */ | |
1183 | ||
1184 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1185 | if (interp_sect == NULL | |
1186 | && (bfd_get_file_flags (exec_bfd) & DYNAMIC) != 0 | |
2f4950cd | 1187 | && (exec_entry_point (exec_bfd, &exec_ops) != pc)) |
e2a44558 KB |
1188 | { |
1189 | struct cleanup *old_chain; | |
1190 | struct section_offsets *new_offsets; | |
1191 | int i, changed; | |
1192 | CORE_ADDR displacement; | |
1193 | ||
1194 | /* It is necessary to relocate the objfile. The amount to | |
1195 | relocate by is simply the address at which we are stopped | |
1196 | minus the starting address from the executable. | |
1197 | ||
1198 | We relocate all of the sections by the same amount. This | |
1199 | behavior is mandated by recent editions of the System V ABI. | |
1200 | According to the System V Application Binary Interface, | |
1201 | Edition 4.1, page 5-5: | |
1202 | ||
1203 | ... Though the system chooses virtual addresses for | |
1204 | individual processes, it maintains the segments' relative | |
1205 | positions. Because position-independent code uses relative | |
1206 | addressesing between segments, the difference between | |
1207 | virtual addresses in memory must match the difference | |
1208 | between virtual addresses in the file. The difference | |
1209 | between the virtual address of any segment in memory and | |
1210 | the corresponding virtual address in the file is thus a | |
1211 | single constant value for any one executable or shared | |
1212 | object in a given process. This difference is the base | |
1213 | address. One use of the base address is to relocate the | |
1214 | memory image of the program during dynamic linking. | |
1215 | ||
1216 | The same language also appears in Edition 4.0 of the System V | |
1217 | ABI and is left unspecified in some of the earlier editions. */ | |
1218 | ||
2f4950cd | 1219 | displacement = pc - exec_entry_point (exec_bfd, &exec_ops); |
e2a44558 KB |
1220 | changed = 0; |
1221 | ||
13fc0c2f KB |
1222 | new_offsets = xcalloc (symfile_objfile->num_sections, |
1223 | sizeof (struct section_offsets)); | |
b8c9b27d | 1224 | old_chain = make_cleanup (xfree, new_offsets); |
e2a44558 KB |
1225 | |
1226 | for (i = 0; i < symfile_objfile->num_sections; i++) | |
1227 | { | |
1228 | if (displacement != ANOFFSET (symfile_objfile->section_offsets, i)) | |
1229 | changed = 1; | |
1230 | new_offsets->offsets[i] = displacement; | |
1231 | } | |
1232 | ||
1233 | if (changed) | |
1234 | objfile_relocate (symfile_objfile, new_offsets); | |
1235 | ||
1236 | do_cleanups (old_chain); | |
1237 | } | |
1238 | } | |
1239 | ||
13437d4b KB |
1240 | /* |
1241 | ||
1242 | GLOBAL FUNCTION | |
1243 | ||
1244 | svr4_solib_create_inferior_hook -- shared library startup support | |
1245 | ||
1246 | SYNOPSIS | |
1247 | ||
7095b863 | 1248 | void svr4_solib_create_inferior_hook () |
13437d4b KB |
1249 | |
1250 | DESCRIPTION | |
1251 | ||
1252 | When gdb starts up the inferior, it nurses it along (through the | |
1253 | shell) until it is ready to execute it's first instruction. At this | |
1254 | point, this function gets called via expansion of the macro | |
1255 | SOLIB_CREATE_INFERIOR_HOOK. | |
1256 | ||
1257 | For SunOS executables, this first instruction is typically the | |
1258 | one at "_start", or a similar text label, regardless of whether | |
1259 | the executable is statically or dynamically linked. The runtime | |
1260 | startup code takes care of dynamically linking in any shared | |
1261 | libraries, once gdb allows the inferior to continue. | |
1262 | ||
1263 | For SVR4 executables, this first instruction is either the first | |
1264 | instruction in the dynamic linker (for dynamically linked | |
1265 | executables) or the instruction at "start" for statically linked | |
1266 | executables. For dynamically linked executables, the system | |
1267 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1268 | and starts it running. The dynamic linker maps in any needed | |
1269 | shared libraries, maps in the actual user executable, and then | |
1270 | jumps to "start" in the user executable. | |
1271 | ||
1272 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1273 | can arrange to cooperate with the dynamic linker to discover the | |
1274 | names of shared libraries that are dynamically linked, and the | |
1275 | base addresses to which they are linked. | |
1276 | ||
1277 | This function is responsible for discovering those names and | |
1278 | addresses, and saving sufficient information about them to allow | |
1279 | their symbols to be read at a later time. | |
1280 | ||
1281 | FIXME | |
1282 | ||
1283 | Between enable_break() and disable_break(), this code does not | |
1284 | properly handle hitting breakpoints which the user might have | |
1285 | set in the startup code or in the dynamic linker itself. Proper | |
1286 | handling will probably have to wait until the implementation is | |
1287 | changed to use the "breakpoint handler function" method. | |
1288 | ||
1289 | Also, what if child has exit()ed? Must exit loop somehow. | |
1290 | */ | |
1291 | ||
e2a44558 | 1292 | static void |
13437d4b KB |
1293 | svr4_solib_create_inferior_hook (void) |
1294 | { | |
e2a44558 KB |
1295 | /* Relocate the main executable if necessary. */ |
1296 | svr4_relocate_main_executable (); | |
1297 | ||
d5a921c9 KB |
1298 | if (!svr4_have_link_map_offsets ()) |
1299 | { | |
8a3fe4f8 | 1300 | warning (_("no shared library support for this OS / ABI")); |
d5a921c9 KB |
1301 | return; |
1302 | ||
1303 | } | |
1304 | ||
13437d4b KB |
1305 | if (!enable_break ()) |
1306 | { | |
8a3fe4f8 | 1307 | warning (_("shared library handler failed to enable breakpoint")); |
13437d4b KB |
1308 | return; |
1309 | } | |
1310 | ||
ab31aa69 KB |
1311 | #if defined(_SCO_DS) |
1312 | /* SCO needs the loop below, other systems should be using the | |
13437d4b KB |
1313 | special shared library breakpoints and the shared library breakpoint |
1314 | service routine. | |
1315 | ||
1316 | Now run the target. It will eventually hit the breakpoint, at | |
1317 | which point all of the libraries will have been mapped in and we | |
1318 | can go groveling around in the dynamic linker structures to find | |
1319 | out what we need to know about them. */ | |
1320 | ||
1321 | clear_proceed_status (); | |
c0236d92 | 1322 | stop_soon = STOP_QUIETLY; |
13437d4b KB |
1323 | stop_signal = TARGET_SIGNAL_0; |
1324 | do | |
1325 | { | |
39f77062 | 1326 | target_resume (pid_to_ptid (-1), 0, stop_signal); |
13437d4b KB |
1327 | wait_for_inferior (); |
1328 | } | |
1329 | while (stop_signal != TARGET_SIGNAL_TRAP); | |
c0236d92 | 1330 | stop_soon = NO_STOP_QUIETLY; |
ab31aa69 | 1331 | #endif /* defined(_SCO_DS) */ |
13437d4b KB |
1332 | } |
1333 | ||
1334 | static void | |
1335 | svr4_clear_solib (void) | |
1336 | { | |
1337 | debug_base = 0; | |
1338 | } | |
1339 | ||
1340 | static void | |
1341 | svr4_free_so (struct so_list *so) | |
1342 | { | |
b8c9b27d KB |
1343 | xfree (so->lm_info->lm); |
1344 | xfree (so->lm_info); | |
13437d4b KB |
1345 | } |
1346 | ||
6bb7be43 JB |
1347 | |
1348 | /* Clear any bits of ADDR that wouldn't fit in a target-format | |
1349 | data pointer. "Data pointer" here refers to whatever sort of | |
1350 | address the dynamic linker uses to manage its sections. At the | |
1351 | moment, we don't support shared libraries on any processors where | |
1352 | code and data pointers are different sizes. | |
1353 | ||
1354 | This isn't really the right solution. What we really need here is | |
1355 | a way to do arithmetic on CORE_ADDR values that respects the | |
1356 | natural pointer/address correspondence. (For example, on the MIPS, | |
1357 | converting a 32-bit pointer to a 64-bit CORE_ADDR requires you to | |
1358 | sign-extend the value. There, simply truncating the bits above | |
1359 | TARGET_PTR_BIT, as we do below, is no good.) This should probably | |
1360 | be a new gdbarch method or something. */ | |
1361 | static CORE_ADDR | |
1362 | svr4_truncate_ptr (CORE_ADDR addr) | |
1363 | { | |
1364 | if (TARGET_PTR_BIT == sizeof (CORE_ADDR) * 8) | |
1365 | /* We don't need to truncate anything, and the bit twiddling below | |
1366 | will fail due to overflow problems. */ | |
1367 | return addr; | |
1368 | else | |
1369 | return addr & (((CORE_ADDR) 1 << TARGET_PTR_BIT) - 1); | |
1370 | } | |
1371 | ||
1372 | ||
749499cb KB |
1373 | static void |
1374 | svr4_relocate_section_addresses (struct so_list *so, | |
1375 | struct section_table *sec) | |
1376 | { | |
cc10cae3 AO |
1377 | sec->addr = svr4_truncate_ptr (sec->addr + LM_ADDR_CHECK (so, |
1378 | sec->bfd)); | |
1379 | sec->endaddr = svr4_truncate_ptr (sec->endaddr + LM_ADDR_CHECK (so, | |
1380 | sec->bfd)); | |
749499cb | 1381 | } |
4b188b9f | 1382 | \f |
749499cb | 1383 | |
4b188b9f | 1384 | /* Architecture-specific operations. */ |
6bb7be43 | 1385 | |
4b188b9f MK |
1386 | /* Per-architecture data key. */ |
1387 | static struct gdbarch_data *solib_svr4_data; | |
e5e2b9ff | 1388 | |
4b188b9f | 1389 | struct solib_svr4_ops |
e5e2b9ff | 1390 | { |
4b188b9f MK |
1391 | /* Return a description of the layout of `struct link_map'. */ |
1392 | struct link_map_offsets *(*fetch_link_map_offsets)(void); | |
1393 | }; | |
e5e2b9ff | 1394 | |
4b188b9f | 1395 | /* Return a default for the architecture-specific operations. */ |
e5e2b9ff | 1396 | |
4b188b9f MK |
1397 | static void * |
1398 | solib_svr4_init (struct obstack *obstack) | |
e5e2b9ff | 1399 | { |
4b188b9f | 1400 | struct solib_svr4_ops *ops; |
e5e2b9ff | 1401 | |
4b188b9f MK |
1402 | ops = OBSTACK_ZALLOC (obstack, struct solib_svr4_ops); |
1403 | ops->fetch_link_map_offsets = legacy_svr4_fetch_link_map_offsets_hook; | |
1404 | return ops; | |
e5e2b9ff KB |
1405 | } |
1406 | ||
4b188b9f MK |
1407 | /* Set the architecture-specific `struct link_map_offsets' fetcher for |
1408 | GDBARCH to FLMO. */ | |
1c4dcb57 | 1409 | |
21479ded | 1410 | void |
e5e2b9ff KB |
1411 | set_solib_svr4_fetch_link_map_offsets (struct gdbarch *gdbarch, |
1412 | struct link_map_offsets *(*flmo) (void)) | |
21479ded | 1413 | { |
4b188b9f MK |
1414 | struct solib_svr4_ops *ops = gdbarch_data (gdbarch, solib_svr4_data); |
1415 | ||
1416 | ops->fetch_link_map_offsets = flmo; | |
21479ded KB |
1417 | } |
1418 | ||
4b188b9f MK |
1419 | /* Fetch a link_map_offsets structure using the architecture-specific |
1420 | `struct link_map_offsets' fetcher. */ | |
1c4dcb57 | 1421 | |
4b188b9f MK |
1422 | static struct link_map_offsets * |
1423 | svr4_fetch_link_map_offsets (void) | |
21479ded | 1424 | { |
4b188b9f MK |
1425 | struct solib_svr4_ops *ops = gdbarch_data (current_gdbarch, solib_svr4_data); |
1426 | ||
1427 | gdb_assert (ops->fetch_link_map_offsets); | |
1428 | return ops->fetch_link_map_offsets (); | |
21479ded KB |
1429 | } |
1430 | ||
4b188b9f MK |
1431 | /* Return 1 if a link map offset fetcher has been defined, 0 otherwise. */ |
1432 | ||
1433 | static int | |
1434 | svr4_have_link_map_offsets (void) | |
1435 | { | |
1436 | struct solib_svr4_ops *ops = gdbarch_data (current_gdbarch, solib_svr4_data); | |
1437 | return (ops->fetch_link_map_offsets != NULL); | |
1438 | } | |
1439 | \f | |
1440 | ||
e4bbbda8 MK |
1441 | /* Most OS'es that have SVR4-style ELF dynamic libraries define a |
1442 | `struct r_debug' and a `struct link_map' that are binary compatible | |
1443 | with the origional SVR4 implementation. */ | |
1444 | ||
1445 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
1446 | for an ILP32 SVR4 system. */ | |
1447 | ||
1448 | struct link_map_offsets * | |
1449 | svr4_ilp32_fetch_link_map_offsets (void) | |
1450 | { | |
1451 | static struct link_map_offsets lmo; | |
1452 | static struct link_map_offsets *lmp = NULL; | |
1453 | ||
1454 | if (lmp == NULL) | |
1455 | { | |
1456 | lmp = &lmo; | |
1457 | ||
e4cd0d6a MK |
1458 | lmo.r_version_offset = 0; |
1459 | lmo.r_version_size = 4; | |
e4bbbda8 | 1460 | lmo.r_map_offset = 4; |
e4cd0d6a | 1461 | lmo.r_ldsomap_offset = 20; |
e4bbbda8 MK |
1462 | |
1463 | /* Everything we need is in the first 20 bytes. */ | |
1464 | lmo.link_map_size = 20; | |
1465 | lmo.l_addr_offset = 0; | |
e4cd0d6a | 1466 | lmo.l_addr_size = 4; |
e4bbbda8 | 1467 | lmo.l_name_offset = 4; |
e4cd0d6a | 1468 | lmo.l_name_size = 4; |
cc10cae3 AO |
1469 | lmo.l_ld_offset = 8; |
1470 | lmo.l_ld_size = 4; | |
e4bbbda8 | 1471 | lmo.l_next_offset = 12; |
e4cd0d6a | 1472 | lmo.l_next_size = 4; |
e4bbbda8 | 1473 | lmo.l_prev_offset = 16; |
e4cd0d6a | 1474 | lmo.l_prev_size = 4; |
e4bbbda8 MK |
1475 | } |
1476 | ||
1477 | return lmp; | |
1478 | } | |
1479 | ||
1480 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |
1481 | for an LP64 SVR4 system. */ | |
1482 | ||
1483 | struct link_map_offsets * | |
1484 | svr4_lp64_fetch_link_map_offsets (void) | |
1485 | { | |
1486 | static struct link_map_offsets lmo; | |
1487 | static struct link_map_offsets *lmp = NULL; | |
1488 | ||
1489 | if (lmp == NULL) | |
1490 | { | |
1491 | lmp = &lmo; | |
1492 | ||
e4cd0d6a MK |
1493 | lmo.r_version_offset = 0; |
1494 | lmo.r_version_size = 4; | |
e4bbbda8 | 1495 | lmo.r_map_offset = 8; |
e4cd0d6a | 1496 | lmo.r_ldsomap_offset = 40; |
e4bbbda8 MK |
1497 | |
1498 | /* Everything we need is in the first 40 bytes. */ | |
1499 | lmo.link_map_size = 40; | |
1500 | lmo.l_addr_offset = 0; | |
e4cd0d6a | 1501 | lmo.l_addr_size = 8; |
e4bbbda8 | 1502 | lmo.l_name_offset = 8; |
e4cd0d6a | 1503 | lmo.l_name_size = 8; |
cc10cae3 AO |
1504 | lmo.l_ld_offset = 16; |
1505 | lmo.l_ld_size = 8; | |
e4bbbda8 | 1506 | lmo.l_next_offset = 24; |
e4cd0d6a | 1507 | lmo.l_next_size = 8; |
e4bbbda8 | 1508 | lmo.l_prev_offset = 32; |
e4cd0d6a | 1509 | lmo.l_prev_size = 8; |
e4bbbda8 MK |
1510 | } |
1511 | ||
1512 | return lmp; | |
1513 | } | |
1514 | \f | |
1515 | ||
13437d4b KB |
1516 | static struct target_so_ops svr4_so_ops; |
1517 | ||
a78f21af AC |
1518 | extern initialize_file_ftype _initialize_svr4_solib; /* -Wmissing-prototypes */ |
1519 | ||
13437d4b KB |
1520 | void |
1521 | _initialize_svr4_solib (void) | |
1522 | { | |
4b188b9f MK |
1523 | solib_svr4_data = gdbarch_data_register_pre_init (solib_svr4_init); |
1524 | ||
749499cb | 1525 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b KB |
1526 | svr4_so_ops.free_so = svr4_free_so; |
1527 | svr4_so_ops.clear_solib = svr4_clear_solib; | |
1528 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
1529 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |
1530 | svr4_so_ops.current_sos = svr4_current_sos; | |
1531 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
d7fa2ae2 | 1532 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; |
13437d4b KB |
1533 | |
1534 | /* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */ | |
1535 | current_target_so_ops = &svr4_so_ops; | |
1536 | } |