File: | src/gnu/usr.bin/binutils/gdb/solib-svr4.c |
Warning: | line 820, column 55 Null pointer passed as 1st argument to string comparison function |
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1 | /* Handle SVR4 shared libraries for GDB, the GNU Debugger. | |||
2 | ||||
3 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, | |||
4 | 2000, 2001, 2003, 2004 | |||
5 | Free Software Foundation, Inc. | |||
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 | |||
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |||
22 | Boston, MA 02111-1307, USA. */ | |||
23 | ||||
24 | #include "defs.h" | |||
25 | ||||
26 | #include "elf/external.h" | |||
27 | #include "elf/common.h" | |||
28 | #include "elf/mips.h" | |||
29 | ||||
30 | #include "auxv.h" | |||
31 | #include "symtab.h" | |||
32 | #include "bfd.h" | |||
33 | #include "symfile.h" | |||
34 | #include "objfiles.h" | |||
35 | #include "gdbcore.h" | |||
36 | #include "target.h" | |||
37 | #include "inferior.h" | |||
38 | #include "command.h" | |||
39 | ||||
40 | #include "solist.h" | |||
41 | #include "solib-svr4.h" | |||
42 | ||||
43 | #include "bfd-target.h" | |||
44 | #include "exec.h" | |||
45 | ||||
46 | #ifndef SVR4_FETCH_LINK_MAP_OFFSETS | |||
47 | #define SVR4_FETCH_LINK_MAP_OFFSETS()svr4_fetch_link_map_offsets () svr4_fetch_link_map_offsets () | |||
48 | #endif | |||
49 | ||||
50 | static struct link_map_offsets *svr4_fetch_link_map_offsets (void); | |||
51 | static struct link_map_offsets *legacy_fetch_link_map_offsets (void); | |||
52 | static int svr4_have_link_map_offsets (void); | |||
53 | ||||
54 | /* fetch_link_map_offsets_gdbarch_data is a handle used to obtain the | |||
55 | architecture specific link map offsets fetching function. */ | |||
56 | ||||
57 | static struct gdbarch_data *fetch_link_map_offsets_gdbarch_data; | |||
58 | ||||
59 | /* legacy_svr4_fetch_link_map_offsets_hook is a pointer to a function | |||
60 | which is used to fetch link map offsets. It will only be set | |||
61 | by solib-legacy.c, if at all. */ | |||
62 | ||||
63 | struct link_map_offsets *(*legacy_svr4_fetch_link_map_offsets_hook)(void) = 0; | |||
64 | ||||
65 | /* Link map info to include in an allocated so_list entry */ | |||
66 | ||||
67 | struct lm_info | |||
68 | { | |||
69 | /* Pointer to copy of link map from inferior. The type is char * | |||
70 | rather than void *, so that we may use byte offsets to find the | |||
71 | various fields without the need for a cast. */ | |||
72 | char *lm; | |||
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 | ||||
83 | static char *solib_break_names[] = | |||
84 | { | |||
85 | "r_debug_state", | |||
86 | "_r_debug_state", | |||
87 | "_dl_debug_state", | |||
88 | "rtld_db_dlactivity", | |||
89 | "_rtld_debug_state", | |||
90 | ||||
91 | /* On the 64-bit PowerPC, the linker symbol with the same name as | |||
92 | the C function points to a function descriptor, not to the entry | |||
93 | point. The linker symbol whose name is the C function name | |||
94 | prefixed with a '.' points to the function's entry point. So | |||
95 | when we look through this table, we ignore symbols that point | |||
96 | into the data section (thus skipping the descriptor's symbol), | |||
97 | and eventually try this one, giving us the real entry point | |||
98 | address. */ | |||
99 | "._dl_debug_state", | |||
100 | ||||
101 | NULL((void*)0) | |||
102 | }; | |||
103 | ||||
104 | #define BKPT_AT_SYMBOL1 1 | |||
105 | ||||
106 | #if defined (BKPT_AT_SYMBOL1) | |||
107 | static char *bkpt_names[] = | |||
108 | { | |||
109 | #ifdef SOLIB_BKPT_NAME | |||
110 | SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ | |||
111 | #endif | |||
112 | "_start", | |||
113 | "__start", | |||
114 | "main", | |||
115 | NULL((void*)0) | |||
116 | }; | |||
117 | #endif | |||
118 | ||||
119 | static char *main_name_list[] = | |||
120 | { | |||
121 | "main_$main", | |||
122 | NULL((void*)0) | |||
123 | }; | |||
124 | ||||
125 | /* Macro to extract an address from a solib structure. When GDB is | |||
126 | configured for some 32-bit targets (e.g. Solaris 2.7 sparc), BFD is | |||
127 | configured to handle 64-bit targets, so CORE_ADDR is 64 bits. We | |||
128 | have to extract only the significant bits of addresses to get the | |||
129 | right address when accessing the core file BFD. | |||
130 | ||||
131 | Assume that the address is unsigned. */ | |||
132 | ||||
133 | #define SOLIB_EXTRACT_ADDRESS(MEMBER)extract_unsigned_integer (&(MEMBER), sizeof (MEMBER)) \ | |||
134 | extract_unsigned_integer (&(MEMBER), sizeof (MEMBER)) | |||
135 | ||||
136 | /* local data declarations */ | |||
137 | ||||
138 | /* link map access functions */ | |||
139 | ||||
140 | static CORE_ADDR | |||
141 | LM_ADDR (struct so_list *so) | |||
142 | { | |||
143 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS ()svr4_fetch_link_map_offsets (); | |||
144 | ||||
145 | return (CORE_ADDR) extract_signed_integer (so->lm_info->lm + lmo->l_addr_offset, | |||
146 | lmo->l_addr_size); | |||
147 | } | |||
148 | ||||
149 | static CORE_ADDR | |||
150 | LM_NEXT (struct so_list *so) | |||
151 | { | |||
152 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS ()svr4_fetch_link_map_offsets (); | |||
153 | ||||
154 | /* Assume that the address is unsigned. */ | |||
155 | return extract_unsigned_integer (so->lm_info->lm + lmo->l_next_offset, | |||
156 | lmo->l_next_size); | |||
157 | } | |||
158 | ||||
159 | static CORE_ADDR | |||
160 | LM_NAME (struct so_list *so) | |||
161 | { | |||
162 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS ()svr4_fetch_link_map_offsets (); | |||
163 | ||||
164 | /* Assume that the address is unsigned. */ | |||
165 | return extract_unsigned_integer (so->lm_info->lm + lmo->l_name_offset, | |||
166 | lmo->l_name_size); | |||
167 | } | |||
168 | ||||
169 | static int | |||
170 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |||
171 | { | |||
172 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS ()svr4_fetch_link_map_offsets (); | |||
173 | ||||
174 | /* Assume that the address is unsigned. */ | |||
175 | return extract_unsigned_integer (so->lm_info->lm + lmo->l_prev_offset, | |||
176 | lmo->l_prev_size) == 0; | |||
177 | } | |||
178 | ||||
179 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ | |||
180 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |||
181 | ||||
182 | /* Local function prototypes */ | |||
183 | ||||
184 | #if 0 | |||
185 | static int match_main (char *); | |||
186 | #endif | |||
187 | ||||
188 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *, flagword); | |||
189 | ||||
190 | /* | |||
191 | ||||
192 | LOCAL FUNCTION | |||
193 | ||||
194 | bfd_lookup_symbol -- lookup the value for a specific symbol | |||
195 | ||||
196 | SYNOPSIS | |||
197 | ||||
198 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname, flagword sect_flags) | |||
199 | ||||
200 | DESCRIPTION | |||
201 | ||||
202 | An expensive way to lookup the value of a single symbol for | |||
203 | bfd's that are only temporary anyway. This is used by the | |||
204 | shared library support to find the address of the debugger | |||
205 | interface structures in the shared library. | |||
206 | ||||
207 | If SECT_FLAGS is non-zero, only match symbols in sections whose | |||
208 | flags include all those in SECT_FLAGS. | |||
209 | ||||
210 | Note that 0 is specifically allowed as an error return (no | |||
211 | such symbol). | |||
212 | */ | |||
213 | ||||
214 | static CORE_ADDR | |||
215 | bfd_lookup_symbol (bfd *abfd, char *symname, flagword sect_flags) | |||
216 | { | |||
217 | long storage_needed; | |||
218 | asymbol *sym; | |||
219 | asymbol **symbol_table; | |||
220 | unsigned int number_of_symbols; | |||
221 | unsigned int i; | |||
222 | struct cleanup *back_to; | |||
223 | CORE_ADDR symaddr = 0; | |||
224 | ||||
225 | storage_needed = bfd_get_symtab_upper_bound (abfd)((*((abfd)->xvec->_bfd_get_symtab_upper_bound)) (abfd)); | |||
226 | ||||
227 | if (storage_needed > 0) | |||
228 | { | |||
229 | symbol_table = (asymbol **) xmalloc (storage_needed); | |||
230 | back_to = make_cleanup (xfree, symbol_table); | |||
231 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table)((*((abfd)->xvec->_bfd_canonicalize_symtab)) (abfd, symbol_table )); | |||
232 | ||||
233 | for (i = 0; i < number_of_symbols; i++) | |||
234 | { | |||
235 | sym = *symbol_table++; | |||
236 | if (strcmp (sym->name, symname) == 0 | |||
237 | && (sym->section->flags & sect_flags) == sect_flags) | |||
238 | { | |||
239 | /* Bfd symbols are section relative. */ | |||
240 | symaddr = sym->value + sym->section->vma; | |||
241 | break; | |||
242 | } | |||
243 | } | |||
244 | do_cleanups (back_to); | |||
245 | } | |||
246 | ||||
247 | if (symaddr) | |||
248 | return symaddr; | |||
249 | ||||
250 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll | |||
251 | have to check the dynamic string table too. */ | |||
252 | ||||
253 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd)((*((abfd)->xvec->_bfd_get_dynamic_symtab_upper_bound)) (abfd)); | |||
254 | ||||
255 | if (storage_needed > 0) | |||
256 | { | |||
257 | symbol_table = (asymbol **) xmalloc (storage_needed); | |||
258 | back_to = make_cleanup (xfree, symbol_table); | |||
259 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table)((*((abfd)->xvec->_bfd_canonicalize_dynamic_symtab)) (abfd , symbol_table)); | |||
260 | ||||
261 | for (i = 0; i < number_of_symbols; i++) | |||
262 | { | |||
263 | sym = *symbol_table++; | |||
264 | ||||
265 | if (strcmp (sym->name, symname) == 0 | |||
266 | && (sym->section->flags & sect_flags) == sect_flags) | |||
267 | { | |||
268 | /* Bfd symbols are section relative. */ | |||
269 | symaddr = sym->value + sym->section->vma; | |||
270 | break; | |||
271 | } | |||
272 | } | |||
273 | do_cleanups (back_to); | |||
274 | } | |||
275 | ||||
276 | return symaddr; | |||
277 | } | |||
278 | ||||
279 | /* | |||
280 | ||||
281 | LOCAL FUNCTION | |||
282 | ||||
283 | elf_locate_base -- locate the base address of dynamic linker structs | |||
284 | for SVR4 elf targets. | |||
285 | ||||
286 | SYNOPSIS | |||
287 | ||||
288 | CORE_ADDR elf_locate_base (void) | |||
289 | ||||
290 | DESCRIPTION | |||
291 | ||||
292 | For SVR4 elf targets the address of the dynamic linker's runtime | |||
293 | structure is contained within the dynamic info section in the | |||
294 | executable file. The dynamic section is also mapped into the | |||
295 | inferior address space. Because the runtime loader fills in the | |||
296 | real address before starting the inferior, we have to read in the | |||
297 | dynamic info section from the inferior address space. | |||
298 | If there are any errors while trying to find the address, we | |||
299 | silently return 0, otherwise the found address is returned. | |||
300 | ||||
301 | */ | |||
302 | ||||
303 | static CORE_ADDR | |||
304 | elf_locate_base (void) | |||
305 | { | |||
306 | struct bfd_section *dyninfo_sect; | |||
307 | int dyninfo_sect_size; | |||
308 | CORE_ADDR dyninfo_addr, relocated_dyninfo_addr, entry_addr; | |||
309 | char *buf; | |||
310 | char *bufend; | |||
311 | int arch_size; | |||
312 | ||||
313 | /* Find the address of the entry point of the program from the | |||
314 | auxv vector. */ | |||
315 | if (target_auxv_search (¤t_target, AT_ENTRY9, &entry_addr) != 1) | |||
316 | { | |||
317 | /* No auxv info, maybe an older kernel. Fake our way through. */ | |||
318 | entry_addr = bfd_get_start_address (exec_bfd)((exec_bfd)->start_address); | |||
319 | } | |||
320 | ||||
321 | /* Find the start address of the .dynamic section. */ | |||
322 | dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); | |||
323 | if (dyninfo_sect == NULL((void*)0)) | |||
324 | return 0; | |||
325 | dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect)((dyninfo_sect)->vma); | |||
326 | ||||
327 | relocated_dyninfo_addr = dyninfo_addr | |||
328 | + entry_addr - bfd_get_start_address(exec_bfd)((exec_bfd)->start_address); | |||
329 | ||||
330 | /* Read in .dynamic section, silently ignore errors. */ | |||
331 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect)((dyninfo_sect)->_raw_size); | |||
332 | buf = alloca (dyninfo_sect_size)__builtin_alloca(dyninfo_sect_size); | |||
333 | if (target_read_memory (relocated_dyninfo_addr, buf, dyninfo_sect_size)) | |||
334 | return 0; | |||
335 | ||||
336 | /* Find the DT_DEBUG entry in the the .dynamic section. | |||
337 | For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has | |||
338 | no DT_DEBUG entries. */ | |||
339 | ||||
340 | arch_size = bfd_get_arch_size (exec_bfd); | |||
341 | if (arch_size == -1) /* failure */ | |||
342 | return 0; | |||
343 | ||||
344 | if (arch_size == 32) | |||
345 | { /* 32-bit elf */ | |||
346 | for (bufend = buf + dyninfo_sect_size; | |||
347 | buf < bufend; | |||
348 | buf += sizeof (Elf32_External_Dyn)) | |||
349 | { | |||
350 | Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf; | |||
351 | long dyn_tag; | |||
352 | CORE_ADDR dyn_ptr; | |||
353 | ||||
354 | dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag)((*((exec_bfd)->xvec->bfd_h_getx32)) ((bfd_byte *) x_dynp ->d_tag)); | |||
355 | if (dyn_tag == DT_NULL0) | |||
356 | break; | |||
357 | else if (dyn_tag == DT_DEBUG21) | |||
358 | { | |||
359 | dyn_ptr = bfd_h_get_32 (exec_bfd,((*((exec_bfd)->xvec->bfd_h_getx32)) ((bfd_byte *) x_dynp ->d_un.d_ptr)) | |||
360 | (bfd_byte *) x_dynp->d_un.d_ptr)((*((exec_bfd)->xvec->bfd_h_getx32)) ((bfd_byte *) x_dynp ->d_un.d_ptr)); | |||
361 | return dyn_ptr; | |||
362 | } | |||
363 | else if (dyn_tag == DT_MIPS_RLD_MAP0x70000016) | |||
364 | { | |||
365 | char *pbuf; | |||
366 | int pbuf_size = TARGET_PTR_BIT(gdbarch_ptr_bit (current_gdbarch)) / HOST_CHAR_BIT8; | |||
367 | ||||
368 | pbuf = alloca (pbuf_size)__builtin_alloca(pbuf_size); | |||
369 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |||
370 | of the dynamic link structure. */ | |||
371 | dyn_ptr = bfd_h_get_32 (exec_bfd,((*((exec_bfd)->xvec->bfd_h_getx32)) ((bfd_byte *) x_dynp ->d_un.d_ptr)) | |||
372 | (bfd_byte *) x_dynp->d_un.d_ptr)((*((exec_bfd)->xvec->bfd_h_getx32)) ((bfd_byte *) x_dynp ->d_un.d_ptr)); | |||
373 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) | |||
374 | return 0; | |||
375 | return extract_unsigned_integer (pbuf, pbuf_size); | |||
376 | } | |||
377 | } | |||
378 | } | |||
379 | else /* 64-bit elf */ | |||
380 | { | |||
381 | for (bufend = buf + dyninfo_sect_size; | |||
382 | buf < bufend; | |||
383 | buf += sizeof (Elf64_External_Dyn)) | |||
384 | { | |||
385 | Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf; | |||
386 | long dyn_tag; | |||
387 | CORE_ADDR dyn_ptr; | |||
388 | ||||
389 | dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag)((*((exec_bfd)->xvec->bfd_h_getx64)) ((bfd_byte *) x_dynp ->d_tag)); | |||
390 | if (dyn_tag == DT_NULL0) | |||
391 | break; | |||
392 | else if (dyn_tag == DT_DEBUG21) | |||
393 | { | |||
394 | dyn_ptr = bfd_h_get_64 (exec_bfd,((*((exec_bfd)->xvec->bfd_h_getx64)) ((bfd_byte *) x_dynp ->d_un.d_ptr)) | |||
395 | (bfd_byte *) x_dynp->d_un.d_ptr)((*((exec_bfd)->xvec->bfd_h_getx64)) ((bfd_byte *) x_dynp ->d_un.d_ptr)); | |||
396 | return dyn_ptr; | |||
397 | } | |||
398 | else if (dyn_tag == DT_MIPS_RLD_MAP0x70000016) | |||
399 | { | |||
400 | char *pbuf; | |||
401 | int pbuf_size = TARGET_PTR_BIT(gdbarch_ptr_bit (current_gdbarch)) / HOST_CHAR_BIT8; | |||
402 | ||||
403 | pbuf = alloca (pbuf_size)__builtin_alloca(pbuf_size); | |||
404 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |||
405 | of the dynamic link structure. */ | |||
406 | dyn_ptr = bfd_h_get_64 (exec_bfd,((*((exec_bfd)->xvec->bfd_h_getx64)) ((bfd_byte *) x_dynp ->d_un.d_ptr)) | |||
407 | (bfd_byte *) x_dynp->d_un.d_ptr)((*((exec_bfd)->xvec->bfd_h_getx64)) ((bfd_byte *) x_dynp ->d_un.d_ptr)); | |||
408 | if (target_read_memory (dyn_ptr, pbuf, pbuf_size)) | |||
409 | return 0; | |||
410 | return extract_unsigned_integer (pbuf, pbuf_size); | |||
411 | } | |||
412 | } | |||
413 | } | |||
414 | ||||
415 | /* DT_DEBUG entry not found. */ | |||
416 | return 0; | |||
417 | } | |||
418 | ||||
419 | /* | |||
420 | ||||
421 | LOCAL FUNCTION | |||
422 | ||||
423 | locate_base -- locate the base address of dynamic linker structs | |||
424 | ||||
425 | SYNOPSIS | |||
426 | ||||
427 | CORE_ADDR locate_base (void) | |||
428 | ||||
429 | DESCRIPTION | |||
430 | ||||
431 | For both the SunOS and SVR4 shared library implementations, if the | |||
432 | inferior executable has been linked dynamically, there is a single | |||
433 | address somewhere in the inferior's data space which is the key to | |||
434 | locating all of the dynamic linker's runtime structures. This | |||
435 | address is the value of the debug base symbol. The job of this | |||
436 | function is to find and return that address, or to return 0 if there | |||
437 | is no such address (the executable is statically linked for example). | |||
438 | ||||
439 | For SunOS, the job is almost trivial, since the dynamic linker and | |||
440 | all of it's structures are statically linked to the executable at | |||
441 | link time. Thus the symbol for the address we are looking for has | |||
442 | already been added to the minimal symbol table for the executable's | |||
443 | objfile at the time the symbol file's symbols were read, and all we | |||
444 | have to do is look it up there. Note that we explicitly do NOT want | |||
445 | to find the copies in the shared library. | |||
446 | ||||
447 | The SVR4 version is a bit more complicated because the address | |||
448 | is contained somewhere in the dynamic info section. We have to go | |||
449 | to a lot more work to discover the address of the debug base symbol. | |||
450 | Because of this complexity, we cache the value we find and return that | |||
451 | value on subsequent invocations. Note there is no copy in the | |||
452 | executable symbol tables. | |||
453 | ||||
454 | */ | |||
455 | ||||
456 | static CORE_ADDR | |||
457 | locate_base (void) | |||
458 | { | |||
459 | /* Check to see if we have a currently valid address, and if so, avoid | |||
460 | doing all this work again and just return the cached address. If | |||
461 | we have no cached address, try to locate it in the dynamic info | |||
462 | section for ELF executables. There's no point in doing any of this | |||
463 | though if we don't have some link map offsets to work with. */ | |||
464 | ||||
465 | if (debug_base == 0 && svr4_have_link_map_offsets ()) | |||
466 | { | |||
467 | if (exec_bfd != NULL((void*)0) | |||
468 | && bfd_get_flavour (exec_bfd)((exec_bfd)->xvec->flavour) == bfd_target_elf_flavour) | |||
469 | debug_base = elf_locate_base (); | |||
470 | } | |||
471 | return (debug_base); | |||
472 | } | |||
473 | ||||
474 | /* | |||
475 | ||||
476 | LOCAL FUNCTION | |||
477 | ||||
478 | first_link_map_member -- locate first member in dynamic linker's map | |||
479 | ||||
480 | SYNOPSIS | |||
481 | ||||
482 | static CORE_ADDR first_link_map_member (void) | |||
483 | ||||
484 | DESCRIPTION | |||
485 | ||||
486 | Find the first element in the inferior's dynamic link map, and | |||
487 | return its address in the inferior. This function doesn't copy the | |||
488 | link map entry itself into our address space; current_sos actually | |||
489 | does the reading. */ | |||
490 | ||||
491 | static CORE_ADDR | |||
492 | first_link_map_member (void) | |||
493 | { | |||
494 | CORE_ADDR lm = 0; | |||
495 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS ()svr4_fetch_link_map_offsets (); | |||
496 | char *r_map_buf = xmalloc (lmo->r_map_size); | |||
497 | struct cleanup *cleanups = make_cleanup (xfree, r_map_buf); | |||
498 | ||||
499 | read_memory (debug_base + lmo->r_map_offset, r_map_buf, lmo->r_map_size); | |||
500 | ||||
501 | /* Assume that the address is unsigned. */ | |||
502 | lm = extract_unsigned_integer (r_map_buf, lmo->r_map_size); | |||
503 | ||||
504 | /* FIXME: Perhaps we should validate the info somehow, perhaps by | |||
505 | checking r_version for a known version number, or r_state for | |||
506 | RT_CONSISTENT. */ | |||
507 | ||||
508 | do_cleanups (cleanups); | |||
509 | ||||
510 | return (lm); | |||
511 | } | |||
512 | ||||
513 | /* | |||
514 | ||||
515 | LOCAL FUNCTION | |||
516 | ||||
517 | open_symbol_file_object | |||
518 | ||||
519 | SYNOPSIS | |||
520 | ||||
521 | void open_symbol_file_object (void *from_tty) | |||
522 | ||||
523 | DESCRIPTION | |||
524 | ||||
525 | If no open symbol file, attempt to locate and open the main symbol | |||
526 | file. On SVR4 systems, this is the first link map entry. If its | |||
527 | name is here, we can open it. Useful when attaching to a process | |||
528 | without first loading its symbol file. | |||
529 | ||||
530 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |||
531 | be printed. This parameter is a pointer rather than an int because | |||
532 | open_symbol_file_object() is called via catch_errors() and | |||
533 | catch_errors() requires a pointer argument. */ | |||
534 | ||||
535 | static int | |||
536 | open_symbol_file_object (void *from_ttyp) | |||
537 | { | |||
538 | CORE_ADDR lm, l_name; | |||
539 | char *filename; | |||
540 | int errcode; | |||
541 | int from_tty = *(int *)from_ttyp; | |||
542 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS ()svr4_fetch_link_map_offsets (); | |||
543 | char *l_name_buf = xmalloc (lmo->l_name_size); | |||
544 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); | |||
545 | ||||
546 | if (symfile_objfile) | |||
547 | if (!query ("Attempt to reload symbols from process? ")) | |||
548 | return 0; | |||
549 | ||||
550 | if ((debug_base = locate_base ()) == 0) | |||
551 | return 0; /* failed somehow... */ | |||
552 | ||||
553 | /* First link map member should be the executable. */ | |||
554 | if ((lm = first_link_map_member ()) == 0) | |||
555 | return 0; /* failed somehow... */ | |||
556 | ||||
557 | /* Read address of name from target memory to GDB. */ | |||
558 | read_memory (lm + lmo->l_name_offset, l_name_buf, lmo->l_name_size); | |||
559 | ||||
560 | /* Convert the address to host format. Assume that the address is | |||
561 | unsigned. */ | |||
562 | l_name = extract_unsigned_integer (l_name_buf, lmo->l_name_size); | |||
563 | ||||
564 | /* Free l_name_buf. */ | |||
565 | do_cleanups (cleanups); | |||
566 | ||||
567 | if (l_name == 0) | |||
568 | return 0; /* No filename. */ | |||
569 | ||||
570 | /* Now fetch the filename from target memory. */ | |||
571 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE512 - 1, &errcode); | |||
572 | ||||
573 | if (errcode) | |||
574 | { | |||
575 | warning ("failed to read exec filename from attached file: %s", | |||
576 | safe_strerror (errcode)); | |||
577 | return 0; | |||
578 | } | |||
579 | ||||
580 | make_cleanup (xfree, filename); | |||
581 | /* Have a pathname: read the symbol file. */ | |||
582 | symbol_file_add_main (filename, from_tty); | |||
583 | ||||
584 | return 1; | |||
585 | } | |||
586 | ||||
587 | /* LOCAL FUNCTION | |||
588 | ||||
589 | current_sos -- build a list of currently loaded shared objects | |||
590 | ||||
591 | SYNOPSIS | |||
592 | ||||
593 | struct so_list *current_sos () | |||
594 | ||||
595 | DESCRIPTION | |||
596 | ||||
597 | Build a list of `struct so_list' objects describing the shared | |||
598 | objects currently loaded in the inferior. This list does not | |||
599 | include an entry for the main executable file. | |||
600 | ||||
601 | Note that we only gather information directly available from the | |||
602 | inferior --- we don't examine any of the shared library files | |||
603 | themselves. The declaration of `struct so_list' says which fields | |||
604 | we provide values for. */ | |||
605 | ||||
606 | static struct so_list * | |||
607 | svr4_current_sos (void) | |||
608 | { | |||
609 | CORE_ADDR lm; | |||
610 | struct so_list *head = 0; | |||
611 | struct so_list **link_ptr = &head; | |||
612 | ||||
613 | /* Make sure we've looked up the inferior's dynamic linker's base | |||
614 | structure. */ | |||
615 | if (! debug_base) | |||
616 | { | |||
617 | debug_base = locate_base (); | |||
618 | ||||
619 | /* If we can't find the dynamic linker's base structure, this | |||
620 | must not be a dynamically linked executable. Hmm. */ | |||
621 | if (! debug_base) | |||
622 | { | |||
623 | if (exec_bfd != NULL((void*)0) && | |||
624 | bfd_get_section_by_name (exec_bfd, ".interp") == NULL((void*)0) && | |||
625 | (bfd_get_file_flags (exec_bfd)((exec_bfd)->flags) & DYNAMIC0x40) != 0 && | |||
626 | bfd_get_start_address (exec_bfd)((exec_bfd)->start_address) != entry_point_address ()) | |||
627 | { | |||
628 | /* this is relocatable static link. | |||
629 | cf. svr4_relocate_main_executable() */ | |||
630 | struct cleanup *old_chain; | |||
631 | struct section_offsets *new_offsets; | |||
632 | int i, changed; | |||
633 | CORE_ADDR displacement; | |||
634 | ||||
635 | displacement = entry_point_address () - bfd_get_start_address (exec_bfd)((exec_bfd)->start_address); | |||
636 | changed = 0; | |||
637 | ||||
638 | new_offsets = xcalloc (symfile_objfile->num_sections, | |||
639 | sizeof (struct section_offsets)); | |||
640 | old_chain = make_cleanup (xfree, new_offsets); | |||
641 | ||||
642 | for (i = 0; i < symfile_objfile->num_sections; i++) | |||
643 | { | |||
644 | if (displacement != ANOFFSET (symfile_objfile->section_offsets, i)((i == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/solib-svr4.c" , 644, "Section index is uninitialized"), -1) : symfile_objfile ->section_offsets->offsets[i])) | |||
645 | changed = 1; | |||
646 | new_offsets->offsets[i] = displacement; | |||
647 | } | |||
648 | ||||
649 | if (changed) | |||
650 | objfile_relocate (symfile_objfile, new_offsets); | |||
651 | ||||
652 | do_cleanups (old_chain); | |||
653 | exec_set_section_offsets(displacement, displacement, displacement); | |||
654 | } | |||
655 | return 0; | |||
656 | } | |||
657 | } | |||
658 | ||||
659 | /* Walk the inferior's link map list, and build our list of | |||
660 | `struct so_list' nodes. */ | |||
661 | lm = first_link_map_member (); | |||
662 | while (lm) | |||
663 | { | |||
664 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS ()svr4_fetch_link_map_offsets (); | |||
665 | struct so_list *new | |||
666 | = (struct so_list *) xmalloc (sizeof (struct so_list)); | |||
667 | struct cleanup *old_chain = make_cleanup (xfree, new); | |||
668 | ||||
669 | memset (new, 0, sizeof (*new)); | |||
670 | ||||
671 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |||
672 | make_cleanup (xfree, new->lm_info); | |||
673 | ||||
674 | new->lm_info->lm = xmalloc (lmo->link_map_size); | |||
675 | make_cleanup (xfree, new->lm_info->lm); | |||
676 | memset (new->lm_info->lm, 0, lmo->link_map_size); | |||
677 | ||||
678 | read_memory (lm, new->lm_info->lm, lmo->link_map_size); | |||
679 | ||||
680 | lm = LM_NEXT (new); | |||
681 | ||||
682 | /* For SVR4 versions, the first entry in the link map is for the | |||
683 | inferior executable, so we must ignore it. For some versions of | |||
684 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |||
685 | does have a name, so we can no longer use a missing name to | |||
686 | decide when to ignore it. */ | |||
687 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new)) | |||
688 | { | |||
689 | /* It is the first link map entry, i.e. it is the main executable. */ | |||
690 | ||||
691 | if (bfd_get_start_address (exec_bfd)((exec_bfd)->start_address) == entry_point_address ()) | |||
692 | { | |||
693 | /* Non-pie case, main executable has not been relocated. */ | |||
694 | free_so (new); | |||
695 | } | |||
696 | else | |||
697 | { | |||
698 | /* Pie case, main executable has been relocated. */ | |||
699 | struct so_list *gdb_solib; | |||
700 | ||||
701 | strncpy (new->so_name, exec_bfd->filename, | |||
702 | SO_NAME_MAX_PATH_SIZE512 - 1); | |||
703 | new->so_name[SO_NAME_MAX_PATH_SIZE512 - 1] = '\0'; | |||
704 | strcpy (new->so_original_name, new->so_name); | |||
705 | new->main_relocated = 0; | |||
706 | ||||
707 | for (gdb_solib = master_so_list (); | |||
708 | gdb_solib; | |||
709 | gdb_solib = gdb_solib->next) | |||
710 | { | |||
711 | if (strcmp (gdb_solib->so_name, new->so_name) == 0) | |||
712 | if (gdb_solib->main_relocated) | |||
713 | break; | |||
714 | } | |||
715 | ||||
716 | if ((gdb_solib && !gdb_solib->main_relocated) || (!gdb_solib)) | |||
717 | { | |||
718 | add_to_target_sections (0 /*from_tty*/, ¤t_target, new); | |||
719 | new->main = 1; | |||
720 | } | |||
721 | ||||
722 | /* We need this in the list of shared libs we return because | |||
723 | solib_add_stub will loop through it and add the symbol file. */ | |||
724 | new->next = 0; | |||
725 | *link_ptr = new; | |||
726 | link_ptr = &new->next; | |||
727 | } | |||
728 | } /* End of IGNORE_FIRST_LINK_MAP_ENTRY */ | |||
729 | else | |||
730 | { | |||
731 | int errcode; | |||
732 | char *buffer; | |||
733 | ||||
734 | /* Extract this shared object's name. */ | |||
735 | target_read_string (LM_NAME (new), &buffer, | |||
736 | SO_NAME_MAX_PATH_SIZE512 - 1, &errcode); | |||
737 | if (errcode != 0) | |||
738 | { | |||
739 | warning ("current_sos: Can't read pathname for load map: %s\n", | |||
740 | safe_strerror (errcode)); | |||
741 | } | |||
742 | else | |||
743 | { | |||
744 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE512 - 1); | |||
745 | new->so_name[SO_NAME_MAX_PATH_SIZE512 - 1] = '\0'; | |||
746 | xfree (buffer); | |||
747 | strcpy (new->so_original_name, new->so_name); | |||
748 | } | |||
749 | ||||
750 | new->next = 0; | |||
751 | *link_ptr = new; | |||
752 | link_ptr = &new->next; | |||
753 | ||||
754 | } | |||
755 | ||||
756 | discard_cleanups (old_chain); | |||
757 | } | |||
758 | ||||
759 | return head; | |||
760 | } | |||
761 | ||||
762 | /* Get the address of the link_map for a given OBJFILE. Loop through | |||
763 | the link maps, and return the address of the one corresponding to | |||
764 | the given objfile. Note that this function takes into account that | |||
765 | objfile can be the main executable, not just a shared library. The | |||
766 | main executable has always an empty name field in the linkmap. */ | |||
767 | ||||
768 | CORE_ADDR | |||
769 | svr4_fetch_objfile_link_map (struct objfile *objfile) | |||
770 | { | |||
771 | CORE_ADDR lm; | |||
772 | ||||
773 | if ((debug_base = locate_base ()) == 0) | |||
| ||||
774 | return 0; /* failed somehow... */ | |||
775 | ||||
776 | /* Position ourselves on the first link map. */ | |||
777 | lm = first_link_map_member (); | |||
778 | while (lm) | |||
779 | { | |||
780 | /* Get info on the layout of the r_debug and link_map structures. */ | |||
781 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS ()svr4_fetch_link_map_offsets (); | |||
782 | int errcode; | |||
783 | char *buffer; | |||
784 | struct lm_info objfile_lm_info; | |||
785 | struct cleanup *old_chain; | |||
786 | CORE_ADDR name_address; | |||
787 | char *l_name_buf = xmalloc (lmo->l_name_size); | |||
788 | old_chain = make_cleanup (xfree, l_name_buf); | |||
789 | ||||
790 | /* Set up the buffer to contain the portion of the link_map | |||
791 | structure that gdb cares about. Note that this is not the | |||
792 | whole link_map structure. */ | |||
793 | objfile_lm_info.lm = xmalloc (lmo->link_map_size); | |||
794 | make_cleanup (xfree, objfile_lm_info.lm); | |||
795 | memset (objfile_lm_info.lm, 0, lmo->link_map_size); | |||
796 | ||||
797 | /* Read the link map into our internal structure. */ | |||
798 | read_memory (lm, objfile_lm_info.lm, lmo->link_map_size); | |||
799 | ||||
800 | /* Read address of name from target memory to GDB. */ | |||
801 | read_memory (lm + lmo->l_name_offset, l_name_buf, lmo->l_name_size); | |||
802 | ||||
803 | /* Extract this object's name. Assume that the address is | |||
804 | unsigned. */ | |||
805 | name_address = extract_unsigned_integer (l_name_buf, lmo->l_name_size); | |||
806 | target_read_string (name_address, &buffer, | |||
807 | SO_NAME_MAX_PATH_SIZE512 - 1, &errcode); | |||
808 | make_cleanup (xfree, buffer); | |||
809 | if (errcode != 0) | |||
810 | { | |||
811 | warning ("svr4_fetch_objfile_link_map: Can't read pathname for load map: %s\n", | |||
812 | safe_strerror (errcode)); | |||
813 | } | |||
814 | else | |||
815 | { | |||
816 | /* Is this the linkmap for the file we want? */ | |||
817 | /* If the file is not a shared library and has no name, | |||
818 | we are sure it is the main executable, so we return that. */ | |||
819 | if ((buffer && strcmp (buffer, objfile->name) == 0) | |||
820 | || (!(objfile->flags & OBJF_SHARED(1 << 3)) && (strcmp (buffer, "") == 0))) | |||
| ||||
821 | { | |||
822 | do_cleanups (old_chain); | |||
823 | return lm; | |||
824 | } | |||
825 | } | |||
826 | /* Not the file we wanted, continue checking. Assume that the | |||
827 | address is unsigned. */ | |||
828 | lm = extract_unsigned_integer (objfile_lm_info.lm + lmo->l_next_offset, | |||
829 | lmo->l_next_size); | |||
830 | do_cleanups (old_chain); | |||
831 | } | |||
832 | return 0; | |||
833 | } | |||
834 | ||||
835 | /* On some systems, the only way to recognize the link map entry for | |||
836 | the main executable file is by looking at its name. Return | |||
837 | non-zero iff SONAME matches one of the known main executable names. */ | |||
838 | ||||
839 | #if 0 | |||
840 | static int | |||
841 | match_main (char *soname) | |||
842 | { | |||
843 | char **mainp; | |||
844 | ||||
845 | for (mainp = main_name_list; *mainp != NULL((void*)0); mainp++) | |||
846 | { | |||
847 | if (strcmp (soname, *mainp) == 0) | |||
848 | return (1); | |||
849 | } | |||
850 | ||||
851 | return (0); | |||
852 | } | |||
853 | #endif | |||
854 | ||||
855 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |||
856 | SVR4 run time loader. */ | |||
857 | static CORE_ADDR interp_text_sect_low; | |||
858 | static CORE_ADDR interp_text_sect_high; | |||
859 | static CORE_ADDR interp_plt_sect_low; | |||
860 | static CORE_ADDR interp_plt_sect_high; | |||
861 | ||||
862 | static int | |||
863 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) | |||
864 | { | |||
865 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |||
866 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |||
867 | || in_plt_section (pc, NULL((void*)0))); | |||
868 | } | |||
869 | ||||
870 | /* Given an executable's ABFD and target, compute the entry-point | |||
871 | address. */ | |||
872 | ||||
873 | static CORE_ADDR | |||
874 | exec_entry_point (struct bfd *abfd, struct target_ops *targ) | |||
875 | { | |||
876 | /* KevinB wrote ... for most targets, the address returned by | |||
877 | bfd_get_start_address() is the entry point for the start | |||
878 | function. But, for some targets, bfd_get_start_address() returns | |||
879 | the address of a function descriptor from which the entry point | |||
880 | address may be extracted. This address is extracted by | |||
881 | gdbarch_convert_from_func_ptr_addr(). The method | |||
882 | gdbarch_convert_from_func_ptr_addr() is the merely the identify | |||
883 | function for targets which don't use function descriptors. */ | |||
884 | return gdbarch_convert_from_func_ptr_addr (current_gdbarch, | |||
885 | bfd_get_start_address (abfd)((abfd)->start_address), | |||
886 | targ); | |||
887 | } | |||
888 | ||||
889 | /* | |||
890 | ||||
891 | LOCAL FUNCTION | |||
892 | ||||
893 | enable_break -- arrange for dynamic linker to hit breakpoint | |||
894 | ||||
895 | SYNOPSIS | |||
896 | ||||
897 | int enable_break (void) | |||
898 | ||||
899 | DESCRIPTION | |||
900 | ||||
901 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |||
902 | debugger interface, support for arranging for the inferior to hit | |||
903 | a breakpoint after mapping in the shared libraries. This function | |||
904 | enables that breakpoint. | |||
905 | ||||
906 | For SunOS, there is a special flag location (in_debugger) which we | |||
907 | set to 1. When the dynamic linker sees this flag set, it will set | |||
908 | a breakpoint at a location known only to itself, after saving the | |||
909 | original contents of that place and the breakpoint address itself, | |||
910 | in it's own internal structures. When we resume the inferior, it | |||
911 | will eventually take a SIGTRAP when it runs into the breakpoint. | |||
912 | We handle this (in a different place) by restoring the contents of | |||
913 | the breakpointed location (which is only known after it stops), | |||
914 | chasing around to locate the shared libraries that have been | |||
915 | loaded, then resuming. | |||
916 | ||||
917 | For SVR4, the debugger interface structure contains a member (r_brk) | |||
918 | which is statically initialized at the time the shared library is | |||
919 | built, to the offset of a function (_r_debug_state) which is guaran- | |||
920 | teed to be called once before mapping in a library, and again when | |||
921 | the mapping is complete. At the time we are examining this member, | |||
922 | it contains only the unrelocated offset of the function, so we have | |||
923 | to do our own relocation. Later, when the dynamic linker actually | |||
924 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |||
925 | ||||
926 | The debugger interface structure also contains an enumeration which | |||
927 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |||
928 | depending upon whether or not the library is being mapped or unmapped, | |||
929 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |||
930 | */ | |||
931 | ||||
932 | static int | |||
933 | enable_break (void) | |||
934 | { | |||
935 | int success = 0; | |||
936 | ||||
937 | #ifdef BKPT_AT_SYMBOL1 | |||
938 | ||||
939 | struct minimal_symbol *msymbol; | |||
940 | char **bkpt_namep; | |||
941 | asection *interp_sect; | |||
942 | ||||
943 | /* First, remove all the solib event breakpoints. Their addresses | |||
944 | may have changed since the last time we ran the program. */ | |||
945 | remove_solib_event_breakpoints (); | |||
946 | ||||
947 | interp_text_sect_low = interp_text_sect_high = 0; | |||
948 | interp_plt_sect_low = interp_plt_sect_high = 0; | |||
949 | ||||
950 | /* Find the .interp section; if not found, warn the user and drop | |||
951 | into the old breakpoint at symbol code. */ | |||
952 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |||
953 | if (interp_sect) | |||
954 | { | |||
955 | unsigned int interp_sect_size; | |||
956 | char *buf; | |||
957 | CORE_ADDR load_addr = 0; | |||
958 | int load_addr_found = 0; | |||
959 | struct so_list *so; | |||
960 | bfd *tmp_bfd = NULL((void*)0); | |||
961 | struct target_ops *tmp_bfd_target; | |||
962 | int tmp_fd = -1; | |||
963 | char *tmp_pathname = NULL((void*)0); | |||
964 | CORE_ADDR sym_addr = 0; | |||
965 | ||||
966 | /* Read the contents of the .interp section into a local buffer; | |||
967 | the contents specify the dynamic linker this program uses. */ | |||
968 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect)((interp_sect)->_raw_size); | |||
969 | buf = alloca (interp_sect_size)__builtin_alloca(interp_sect_size); | |||
970 | bfd_get_section_contents (exec_bfd, interp_sect, | |||
971 | buf, 0, interp_sect_size); | |||
972 | ||||
973 | /* Now we need to figure out where the dynamic linker was | |||
974 | loaded so that we can load its symbols and place a breakpoint | |||
975 | in the dynamic linker itself. | |||
976 | ||||
977 | This address is stored on the stack. However, I've been unable | |||
978 | to find any magic formula to find it for Solaris (appears to | |||
979 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |||
980 | mechanism to find the dynamic linker's base address. */ | |||
981 | ||||
982 | tmp_fd = solib_open (buf, &tmp_pathname); | |||
983 | if (tmp_fd >= 0) | |||
984 | tmp_bfd = bfd_fdopenr (tmp_pathname, gnutarget, tmp_fd); | |||
985 | ||||
986 | if (tmp_bfd == NULL((void*)0)) | |||
987 | goto bkpt_at_symbol; | |||
988 | ||||
989 | /* Make sure the dynamic linker's really a useful object. */ | |||
990 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |||
991 | { | |||
992 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |||
993 | bfd_close (tmp_bfd); | |||
994 | goto bkpt_at_symbol; | |||
995 | } | |||
996 | ||||
997 | /* Now convert the TMP_BFD into a target. That way target, as | |||
998 | well as BFD operations can be used. Note that closing the | |||
999 | target will also close the underlying bfd. */ | |||
1000 | tmp_bfd_target = target_bfd_reopen (tmp_bfd); | |||
1001 | ||||
1002 | /* On a running target, we can get the dynamic linker's base | |||
1003 | address from the shared library table. */ | |||
1004 | solib_add (NULL((void*)0), 0, NULL((void*)0), auto_solib_add); | |||
1005 | so = master_so_list (); | |||
1006 | while (so) | |||
1007 | { | |||
1008 | if (strcmp (buf, so->so_original_name) == 0) | |||
1009 | { | |||
1010 | load_addr_found = 1; | |||
1011 | load_addr = LM_ADDR (so); | |||
1012 | break; | |||
1013 | } | |||
1014 | so = so->next; | |||
1015 | } | |||
1016 | ||||
1017 | /* Otherwise we find the dynamic linker's base address by examining | |||
1018 | the current pc (which should point at the entry point for the | |||
1019 | dynamic linker) and subtracting the offset of the entry point. */ | |||
1020 | if (!load_addr_found) | |||
1021 | load_addr = (read_pc () | |||
1022 | - exec_entry_point (tmp_bfd, tmp_bfd_target)); | |||
1023 | ||||
1024 | /* Record the relocated start and end address of the dynamic linker | |||
1025 | text and plt section for svr4_in_dynsym_resolve_code. */ | |||
1026 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |||
1027 | if (interp_sect) | |||
1028 | { | |||
1029 | interp_text_sect_low = | |||
1030 | bfd_section_vma (tmp_bfd, interp_sect)((interp_sect)->vma) + load_addr; | |||
1031 | interp_text_sect_high = | |||
1032 | interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect)((interp_sect)->_raw_size); | |||
1033 | } | |||
1034 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |||
1035 | if (interp_sect) | |||
1036 | { | |||
1037 | interp_plt_sect_low = | |||
1038 | bfd_section_vma (tmp_bfd, interp_sect)((interp_sect)->vma) + load_addr; | |||
1039 | interp_plt_sect_high = | |||
1040 | interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect)((interp_sect)->_raw_size); | |||
1041 | } | |||
1042 | ||||
1043 | /* Now try to set a breakpoint in the dynamic linker. */ | |||
1044 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL((void*)0); bkpt_namep++) | |||
1045 | { | |||
1046 | /* On ABI's that use function descriptors, there are usually | |||
1047 | two linker symbols associated with each C function: one | |||
1048 | pointing at the actual entry point of the machine code, | |||
1049 | and one pointing at the function's descriptor. The | |||
1050 | latter symbol has the same name as the C function. | |||
1051 | ||||
1052 | What we're looking for here is the machine code entry | |||
1053 | point, so we are only interested in symbols in code | |||
1054 | sections. */ | |||
1055 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep, SEC_CODE0x020); | |||
1056 | if (sym_addr != 0) | |||
1057 | break; | |||
1058 | } | |||
1059 | ||||
1060 | /* We're done with both the temporary bfd and target. Remember, | |||
1061 | closing the target closes the underlying bfd. */ | |||
1062 | target_close (tmp_bfd_target, 0); | |||
1063 | ||||
1064 | if (sym_addr != 0) | |||
1065 | { | |||
1066 | create_solib_event_breakpoint (load_addr + sym_addr); | |||
1067 | return 1; | |||
1068 | } | |||
1069 | ||||
1070 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |||
1071 | linker. Warn and drop into the old code. */ | |||
1072 | bkpt_at_symbol: | |||
1073 | warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code."); | |||
1074 | } | |||
1075 | ||||
1076 | /* Scan through the list of symbols, trying to look up the symbol and | |||
1077 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |||
1078 | ||||
1079 | breakpoint_addr = 0; | |||
1080 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL((void*)0); bkpt_namep++) | |||
1081 | { | |||
1082 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL((void*)0), symfile_objfile); | |||
1083 | if ((msymbol != NULL((void*)0)) && (SYMBOL_VALUE_ADDRESS (msymbol)(msymbol)->ginfo.value.address != 0)) | |||
1084 | { | |||
1085 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)(msymbol)->ginfo.value.address); | |||
1086 | return 1; | |||
1087 | } | |||
1088 | } | |||
1089 | ||||
1090 | /* Nothing good happened. */ | |||
1091 | success = 0; | |||
1092 | ||||
1093 | #endif /* BKPT_AT_SYMBOL */ | |||
1094 | ||||
1095 | return (success); | |||
1096 | } | |||
1097 | ||||
1098 | /* | |||
1099 | ||||
1100 | LOCAL FUNCTION | |||
1101 | ||||
1102 | special_symbol_handling -- additional shared library symbol handling | |||
1103 | ||||
1104 | SYNOPSIS | |||
1105 | ||||
1106 | void special_symbol_handling () | |||
1107 | ||||
1108 | DESCRIPTION | |||
1109 | ||||
1110 | Once the symbols from a shared object have been loaded in the usual | |||
1111 | way, we are called to do any system specific symbol handling that | |||
1112 | is needed. | |||
1113 | ||||
1114 | For SunOS4, this consisted of grunging around in the dynamic | |||
1115 | linkers structures to find symbol definitions for "common" symbols | |||
1116 | and adding them to the minimal symbol table for the runtime common | |||
1117 | objfile. | |||
1118 | ||||
1119 | However, for SVR4, there's nothing to do. | |||
1120 | ||||
1121 | */ | |||
1122 | ||||
1123 | static void | |||
1124 | svr4_special_symbol_handling (void) | |||
1125 | { | |||
1126 | } | |||
1127 | ||||
1128 | /* Relocate the main executable. This function should be called upon | |||
1129 | stopping the inferior process at the entry point to the program. | |||
1130 | The entry point from BFD is compared to the PC and if they are | |||
1131 | different, the main executable is relocated by the proper amount. | |||
1132 | ||||
1133 | As written it will only attempt to relocate executables which | |||
1134 | lack interpreter sections. It seems likely that only dynamic | |||
1135 | linker executables will get relocated, though it should work | |||
1136 | properly for a position-independent static executable as well. */ | |||
1137 | ||||
1138 | static void | |||
1139 | svr4_relocate_main_executable (void) | |||
1140 | { | |||
1141 | asection *interp_sect; | |||
1142 | CORE_ADDR pc = read_pc (); | |||
1143 | ||||
1144 | /* Decide if the objfile needs to be relocated. As indicated above, | |||
1145 | we will only be here when execution is stopped at the beginning | |||
1146 | of the program. Relocation is necessary if the address at which | |||
1147 | we are presently stopped differs from the start address stored in | |||
1148 | the executable AND there's no interpreter section. The condition | |||
1149 | regarding the interpreter section is very important because if | |||
1150 | there *is* an interpreter section, execution will begin there | |||
1151 | instead. When there is an interpreter section, the start address | |||
1152 | is (presumably) used by the interpreter at some point to start | |||
1153 | execution of the program. | |||
1154 | ||||
1155 | If there is an interpreter, it is normal for it to be set to an | |||
1156 | arbitrary address at the outset. The job of finding it is | |||
1157 | handled in enable_break(). | |||
1158 | ||||
1159 | So, to summarize, relocations are necessary when there is no | |||
1160 | interpreter section and the start address obtained from the | |||
1161 | executable is different from the address at which GDB is | |||
1162 | currently stopped. | |||
1163 | ||||
1164 | [ The astute reader will note that we also test to make sure that | |||
1165 | the executable in question has the DYNAMIC flag set. It is my | |||
1166 | opinion that this test is unnecessary (undesirable even). It | |||
1167 | was added to avoid inadvertent relocation of an executable | |||
1168 | whose e_type member in the ELF header is not ET_DYN. There may | |||
1169 | be a time in the future when it is desirable to do relocations | |||
1170 | on other types of files as well in which case this condition | |||
1171 | should either be removed or modified to accomodate the new file | |||
1172 | type. (E.g, an ET_EXEC executable which has been built to be | |||
1173 | position-independent could safely be relocated by the OS if | |||
1174 | desired. It is true that this violates the ABI, but the ABI | |||
1175 | has been known to be bent from time to time.) - Kevin, Nov 2000. ] | |||
1176 | */ | |||
1177 | ||||
1178 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |||
1179 | if (interp_sect == NULL((void*)0) | |||
1180 | && (bfd_get_file_flags (exec_bfd)((exec_bfd)->flags) & DYNAMIC0x40) != 0 | |||
1181 | && (exec_entry_point (exec_bfd, &exec_ops) != pc)) | |||
1182 | { | |||
1183 | struct cleanup *old_chain; | |||
1184 | struct section_offsets *new_offsets; | |||
1185 | int i, changed; | |||
1186 | CORE_ADDR displacement; | |||
1187 | ||||
1188 | /* It is necessary to relocate the objfile. The amount to | |||
1189 | relocate by is simply the address at which we are stopped | |||
1190 | minus the starting address from the executable. | |||
1191 | ||||
1192 | We relocate all of the sections by the same amount. This | |||
1193 | behavior is mandated by recent editions of the System V ABI. | |||
1194 | According to the System V Application Binary Interface, | |||
1195 | Edition 4.1, page 5-5: | |||
1196 | ||||
1197 | ... Though the system chooses virtual addresses for | |||
1198 | individual processes, it maintains the segments' relative | |||
1199 | positions. Because position-independent code uses relative | |||
1200 | addressesing between segments, the difference between | |||
1201 | virtual addresses in memory must match the difference | |||
1202 | between virtual addresses in the file. The difference | |||
1203 | between the virtual address of any segment in memory and | |||
1204 | the corresponding virtual address in the file is thus a | |||
1205 | single constant value for any one executable or shared | |||
1206 | object in a given process. This difference is the base | |||
1207 | address. One use of the base address is to relocate the | |||
1208 | memory image of the program during dynamic linking. | |||
1209 | ||||
1210 | The same language also appears in Edition 4.0 of the System V | |||
1211 | ABI and is left unspecified in some of the earlier editions. */ | |||
1212 | ||||
1213 | displacement = pc - exec_entry_point (exec_bfd, &exec_ops); | |||
1214 | changed = 0; | |||
1215 | ||||
1216 | new_offsets = xcalloc (symfile_objfile->num_sections, | |||
1217 | sizeof (struct section_offsets)); | |||
1218 | old_chain = make_cleanup (xfree, new_offsets); | |||
1219 | ||||
1220 | for (i = 0; i < symfile_objfile->num_sections; i++) | |||
1221 | { | |||
1222 | if (displacement != ANOFFSET (symfile_objfile->section_offsets, i)((i == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/solib-svr4.c" , 1222, "Section index is uninitialized"), -1) : symfile_objfile ->section_offsets->offsets[i])) | |||
1223 | changed = 1; | |||
1224 | new_offsets->offsets[i] = displacement; | |||
1225 | } | |||
1226 | ||||
1227 | if (changed) | |||
1228 | objfile_relocate (symfile_objfile, new_offsets); | |||
1229 | ||||
1230 | do_cleanups (old_chain); | |||
1231 | } | |||
1232 | } | |||
1233 | ||||
1234 | /* | |||
1235 | ||||
1236 | GLOBAL FUNCTION | |||
1237 | ||||
1238 | svr4_solib_create_inferior_hook -- shared library startup support | |||
1239 | ||||
1240 | SYNOPSIS | |||
1241 | ||||
1242 | void svr4_solib_create_inferior_hook() | |||
1243 | ||||
1244 | DESCRIPTION | |||
1245 | ||||
1246 | When gdb starts up the inferior, it nurses it along (through the | |||
1247 | shell) until it is ready to execute it's first instruction. At this | |||
1248 | point, this function gets called via expansion of the macro | |||
1249 | SOLIB_CREATE_INFERIOR_HOOK. | |||
1250 | ||||
1251 | For SunOS executables, this first instruction is typically the | |||
1252 | one at "_start", or a similar text label, regardless of whether | |||
1253 | the executable is statically or dynamically linked. The runtime | |||
1254 | startup code takes care of dynamically linking in any shared | |||
1255 | libraries, once gdb allows the inferior to continue. | |||
1256 | ||||
1257 | For SVR4 executables, this first instruction is either the first | |||
1258 | instruction in the dynamic linker (for dynamically linked | |||
1259 | executables) or the instruction at "start" for statically linked | |||
1260 | executables. For dynamically linked executables, the system | |||
1261 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |||
1262 | and starts it running. The dynamic linker maps in any needed | |||
1263 | shared libraries, maps in the actual user executable, and then | |||
1264 | jumps to "start" in the user executable. | |||
1265 | ||||
1266 | For both SunOS shared libraries, and SVR4 shared libraries, we | |||
1267 | can arrange to cooperate with the dynamic linker to discover the | |||
1268 | names of shared libraries that are dynamically linked, and the | |||
1269 | base addresses to which they are linked. | |||
1270 | ||||
1271 | This function is responsible for discovering those names and | |||
1272 | addresses, and saving sufficient information about them to allow | |||
1273 | their symbols to be read at a later time. | |||
1274 | ||||
1275 | FIXME | |||
1276 | ||||
1277 | Between enable_break() and disable_break(), this code does not | |||
1278 | properly handle hitting breakpoints which the user might have | |||
1279 | set in the startup code or in the dynamic linker itself. Proper | |||
1280 | handling will probably have to wait until the implementation is | |||
1281 | changed to use the "breakpoint handler function" method. | |||
1282 | ||||
1283 | Also, what if child has exit()ed? Must exit loop somehow. | |||
1284 | */ | |||
1285 | ||||
1286 | static void | |||
1287 | svr4_solib_create_inferior_hook (void) | |||
1288 | { | |||
1289 | /* Relocate the main executable if necessary. */ | |||
1290 | svr4_relocate_main_executable (); | |||
1291 | ||||
1292 | if (!svr4_have_link_map_offsets ()) | |||
1293 | { | |||
1294 | warning ("no shared library support for this OS / ABI"); | |||
1295 | return; | |||
1296 | ||||
1297 | } | |||
1298 | ||||
1299 | if (!enable_break ()) | |||
1300 | { | |||
1301 | warning ("shared library handler failed to enable breakpoint"); | |||
1302 | return; | |||
1303 | } | |||
1304 | ||||
1305 | #if defined(_SCO_DS) | |||
1306 | /* SCO needs the loop below, other systems should be using the | |||
1307 | special shared library breakpoints and the shared library breakpoint | |||
1308 | service routine. | |||
1309 | ||||
1310 | Now run the target. It will eventually hit the breakpoint, at | |||
1311 | which point all of the libraries will have been mapped in and we | |||
1312 | can go groveling around in the dynamic linker structures to find | |||
1313 | out what we need to know about them. */ | |||
1314 | ||||
1315 | clear_proceed_status (); | |||
1316 | stop_soon = STOP_QUIETLY; | |||
1317 | stop_signal = TARGET_SIGNAL_0; | |||
1318 | do | |||
1319 | { | |||
1320 | target_resume (pid_to_ptid (-1), 0, stop_signal)do { dcache_invalidate(target_dcache); (*current_target.to_resume ) (pid_to_ptid (-1), 0, stop_signal); } while (0); | |||
1321 | wait_for_inferior (); | |||
1322 | } | |||
1323 | while (stop_signal != TARGET_SIGNAL_TRAP); | |||
1324 | stop_soon = NO_STOP_QUIETLY; | |||
1325 | #endif /* defined(_SCO_DS) */ | |||
1326 | ||||
1327 | disable_breakpoints_at_startup (1); | |||
1328 | } | |||
1329 | ||||
1330 | static void | |||
1331 | svr4_clear_solib (void) | |||
1332 | { | |||
1333 | debug_base = 0; | |||
1334 | } | |||
1335 | ||||
1336 | static void | |||
1337 | svr4_free_so (struct so_list *so) | |||
1338 | { | |||
1339 | xfree (so->lm_info->lm); | |||
1340 | xfree (so->lm_info); | |||
1341 | } | |||
1342 | ||||
1343 | ||||
1344 | /* Clear any bits of ADDR that wouldn't fit in a target-format | |||
1345 | data pointer. "Data pointer" here refers to whatever sort of | |||
1346 | address the dynamic linker uses to manage its sections. At the | |||
1347 | moment, we don't support shared libraries on any processors where | |||
1348 | code and data pointers are different sizes. | |||
1349 | ||||
1350 | This isn't really the right solution. What we really need here is | |||
1351 | a way to do arithmetic on CORE_ADDR values that respects the | |||
1352 | natural pointer/address correspondence. (For example, on the MIPS, | |||
1353 | converting a 32-bit pointer to a 64-bit CORE_ADDR requires you to | |||
1354 | sign-extend the value. There, simply truncating the bits above | |||
1355 | TARGET_PTR_BIT, as we do below, is no good.) This should probably | |||
1356 | be a new gdbarch method or something. */ | |||
1357 | static CORE_ADDR | |||
1358 | svr4_truncate_ptr (CORE_ADDR addr) | |||
1359 | { | |||
1360 | if (TARGET_PTR_BIT(gdbarch_ptr_bit (current_gdbarch)) == sizeof (CORE_ADDR) * 8) | |||
1361 | /* We don't need to truncate anything, and the bit twiddling below | |||
1362 | will fail due to overflow problems. */ | |||
1363 | return addr; | |||
1364 | else | |||
1365 | return addr & (((CORE_ADDR) 1 << TARGET_PTR_BIT(gdbarch_ptr_bit (current_gdbarch))) - 1); | |||
1366 | } | |||
1367 | ||||
1368 | ||||
1369 | static void | |||
1370 | svr4_relocate_section_addresses (struct so_list *so, | |||
1371 | struct section_table *sec) | |||
1372 | { | |||
1373 | sec->addr = svr4_truncate_ptr (sec->addr + LM_ADDR (so)); | |||
1374 | sec->endaddr = svr4_truncate_ptr (sec->endaddr + LM_ADDR (so)); | |||
1375 | } | |||
1376 | ||||
1377 | ||||
1378 | /* Fetch a link_map_offsets structure for native targets using struct | |||
1379 | definitions from link.h. See solib-legacy.c for the function | |||
1380 | which does the actual work. | |||
1381 | ||||
1382 | Note: For non-native targets (i.e. cross-debugging situations), | |||
1383 | a target specific fetch_link_map_offsets() function should be | |||
1384 | defined and registered via set_solib_svr4_fetch_link_map_offsets(). */ | |||
1385 | ||||
1386 | static struct link_map_offsets * | |||
1387 | legacy_fetch_link_map_offsets (void) | |||
1388 | { | |||
1389 | if (legacy_svr4_fetch_link_map_offsets_hook) | |||
1390 | return legacy_svr4_fetch_link_map_offsets_hook (); | |||
1391 | else | |||
1392 | { | |||
1393 | internal_error (__FILE__"/usr/src/gnu/usr.bin/binutils/gdb/solib-svr4.c", __LINE__1393, | |||
1394 | "legacy_fetch_link_map_offsets called without legacy " | |||
1395 | "link_map support enabled."); | |||
1396 | return 0; | |||
1397 | } | |||
1398 | } | |||
1399 | ||||
1400 | /* Fetch a link_map_offsets structure using the method registered in the | |||
1401 | architecture vector. */ | |||
1402 | ||||
1403 | static struct link_map_offsets * | |||
1404 | svr4_fetch_link_map_offsets (void) | |||
1405 | { | |||
1406 | struct link_map_offsets *(*flmo)(void) = | |||
1407 | gdbarch_data (current_gdbarch, fetch_link_map_offsets_gdbarch_data); | |||
1408 | ||||
1409 | if (flmo == NULL((void*)0)) | |||
1410 | { | |||
1411 | internal_error (__FILE__"/usr/src/gnu/usr.bin/binutils/gdb/solib-svr4.c", __LINE__1411, | |||
1412 | "svr4_fetch_link_map_offsets: fetch_link_map_offsets " | |||
1413 | "method not defined for this architecture."); | |||
1414 | return 0; | |||
1415 | } | |||
1416 | else | |||
1417 | return (flmo ()); | |||
1418 | } | |||
1419 | ||||
1420 | /* Return 1 if a link map offset fetcher has been defined, 0 otherwise. */ | |||
1421 | static int | |||
1422 | svr4_have_link_map_offsets (void) | |||
1423 | { | |||
1424 | struct link_map_offsets *(*flmo)(void) = | |||
1425 | gdbarch_data (current_gdbarch, fetch_link_map_offsets_gdbarch_data); | |||
1426 | if (flmo == NULL((void*)0) | |||
1427 | || (flmo == legacy_fetch_link_map_offsets | |||
1428 | && legacy_svr4_fetch_link_map_offsets_hook == NULL((void*)0))) | |||
1429 | return 0; | |||
1430 | else | |||
1431 | return 1; | |||
1432 | } | |||
1433 | ||||
1434 | /* set_solib_svr4_fetch_link_map_offsets() is intended to be called by | |||
1435 | a <arch>_gdbarch_init() function. It is used to establish an | |||
1436 | architecture specific link_map_offsets fetcher for the architecture | |||
1437 | being defined. */ | |||
1438 | ||||
1439 | void | |||
1440 | set_solib_svr4_fetch_link_map_offsets (struct gdbarch *gdbarch, | |||
1441 | struct link_map_offsets *(*flmo) (void)) | |||
1442 | { | |||
1443 | deprecated_set_gdbarch_data (gdbarch, fetch_link_map_offsets_gdbarch_data, flmo); | |||
1444 | } | |||
1445 | ||||
1446 | /* Initialize the architecture-specific link_map_offsets fetcher. | |||
1447 | This is called after <arch>_gdbarch_init() has set up its `struct | |||
1448 | gdbarch' for the new architecture, and is only called if the | |||
1449 | link_map_offsets fetcher isn't already initialized (which is | |||
1450 | usually done by calling set_solib_svr4_fetch_link_map_offsets() | |||
1451 | above in <arch>_gdbarch_init()). Therefore we attempt to provide a | |||
1452 | reasonable alternative (for native targets anyway) if the | |||
1453 | <arch>_gdbarch_init() fails to call | |||
1454 | set_solib_svr4_fetch_link_map_offsets(). */ | |||
1455 | ||||
1456 | static void * | |||
1457 | init_fetch_link_map_offsets (struct gdbarch *gdbarch) | |||
1458 | { | |||
1459 | return legacy_fetch_link_map_offsets; | |||
1460 | } | |||
1461 | ||||
1462 | /* Most OS'es that have SVR4-style ELF dynamic libraries define a | |||
1463 | `struct r_debug' and a `struct link_map' that are binary compatible | |||
1464 | with the origional SVR4 implementation. */ | |||
1465 | ||||
1466 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |||
1467 | for an ILP32 SVR4 system. */ | |||
1468 | ||||
1469 | struct link_map_offsets * | |||
1470 | svr4_ilp32_fetch_link_map_offsets (void) | |||
1471 | { | |||
1472 | static struct link_map_offsets lmo; | |||
1473 | static struct link_map_offsets *lmp = NULL((void*)0); | |||
1474 | ||||
1475 | if (lmp == NULL((void*)0)) | |||
1476 | { | |||
1477 | lmp = &lmo; | |||
1478 | ||||
1479 | /* Everything we need is in the first 8 bytes. */ | |||
1480 | lmo.r_debug_size = 8; | |||
1481 | lmo.r_map_offset = 4; | |||
1482 | lmo.r_map_size = 4; | |||
1483 | ||||
1484 | /* Everything we need is in the first 20 bytes. */ | |||
1485 | lmo.link_map_size = 20; | |||
1486 | lmo.l_addr_offset = 0; | |||
1487 | lmo.l_addr_size = 4; | |||
1488 | lmo.l_name_offset = 4; | |||
1489 | lmo.l_name_size = 4; | |||
1490 | lmo.l_next_offset = 12; | |||
1491 | lmo.l_next_size = 4; | |||
1492 | lmo.l_prev_offset = 16; | |||
1493 | lmo.l_prev_size = 4; | |||
1494 | } | |||
1495 | ||||
1496 | return lmp; | |||
1497 | } | |||
1498 | ||||
1499 | /* Fetch (and possibly build) an appropriate `struct link_map_offsets' | |||
1500 | for an LP64 SVR4 system. */ | |||
1501 | ||||
1502 | struct link_map_offsets * | |||
1503 | svr4_lp64_fetch_link_map_offsets (void) | |||
1504 | { | |||
1505 | static struct link_map_offsets lmo; | |||
1506 | static struct link_map_offsets *lmp = NULL((void*)0); | |||
1507 | ||||
1508 | if (lmp == NULL((void*)0)) | |||
1509 | { | |||
1510 | lmp = &lmo; | |||
1511 | ||||
1512 | /* Everything we need is in the first 16 bytes. */ | |||
1513 | lmo.r_debug_size = 16; | |||
1514 | lmo.r_map_offset = 8; | |||
1515 | lmo.r_map_size = 8; | |||
1516 | ||||
1517 | /* Everything we need is in the first 40 bytes. */ | |||
1518 | lmo.link_map_size = 40; | |||
1519 | lmo.l_addr_offset = 0; | |||
1520 | lmo.l_addr_size = 8; | |||
1521 | lmo.l_name_offset = 8; | |||
1522 | lmo.l_name_size = 8; | |||
1523 | lmo.l_next_offset = 24; | |||
1524 | lmo.l_next_size = 8; | |||
1525 | lmo.l_prev_offset = 32; | |||
1526 | lmo.l_prev_size = 8; | |||
1527 | } | |||
1528 | ||||
1529 | return lmp; | |||
1530 | } | |||
1531 | ||||
1532 | ||||
1533 | static struct target_so_ops svr4_so_ops; | |||
1534 | ||||
1535 | extern initialize_file_ftype _initialize_svr4_solib; /* -Wmissing-prototypes */ | |||
1536 | ||||
1537 | void | |||
1538 | _initialize_svr4_solib (void) | |||
1539 | { | |||
1540 | fetch_link_map_offsets_gdbarch_data = | |||
1541 | gdbarch_data_register_post_init (init_fetch_link_map_offsets); | |||
1542 | ||||
1543 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; | |||
1544 | svr4_so_ops.free_so = svr4_free_so; | |||
1545 | svr4_so_ops.clear_solib = svr4_clear_solib; | |||
1546 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |||
1547 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |||
1548 | svr4_so_ops.current_sos = svr4_current_sos; | |||
1549 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |||
1550 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; | |||
1551 | ||||
1552 | /* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */ | |||
1553 | current_target_so_ops = &svr4_so_ops; | |||
1554 | } |