| 1 | /* Handle OSF/1, Digital UNIX, and Tru64 shared libraries |
| 2 | for GDB, the GNU Debugger. |
| 3 | Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2007, 2008, |
| 4 | 2009, 2010, 2011 Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | /* When handling shared libraries, GDB has to find out the pathnames |
| 22 | of all shared libraries that are currently loaded (to read in their |
| 23 | symbols) and where the shared libraries are loaded in memory |
| 24 | (to relocate them properly from their prelinked addresses to the |
| 25 | current load address). |
| 26 | |
| 27 | Under OSF/1 there are two possibilities to get at this information: |
| 28 | |
| 29 | 1) Peek around in the runtime loader structures. |
| 30 | These are not documented, and they are not defined in the system |
| 31 | header files. The definitions below were obtained by experimentation, |
| 32 | but they seem stable enough. |
| 33 | |
| 34 | 2) Use the libxproc.a library, which contains the equivalent ldr_* |
| 35 | routines. The library is documented in Tru64 5.x, but as of 5.1, it |
| 36 | only allows a process to examine itself. On earlier versions, it |
| 37 | may require that the GDB executable be dynamically linked and that |
| 38 | NAT_CLIBS include -lxproc -Wl,-expect_unresolved,ldr_process_context |
| 39 | for GDB and all applications that are using libgdb. |
| 40 | |
| 41 | We will use the peeking approach until libxproc.a works for other |
| 42 | processes. */ |
| 43 | |
| 44 | #include "defs.h" |
| 45 | |
| 46 | #include <sys/types.h> |
| 47 | #include <signal.h> |
| 48 | #include "gdb_string.h" |
| 49 | |
| 50 | #include "bfd.h" |
| 51 | #include "symtab.h" |
| 52 | #include "symfile.h" |
| 53 | #include "objfiles.h" |
| 54 | #include "target.h" |
| 55 | #include "inferior.h" |
| 56 | #include "gdbthread.h" |
| 57 | #include "solist.h" |
| 58 | #include "solib.h" |
| 59 | |
| 60 | #ifdef USE_LDR_ROUTINES |
| 61 | # include <loader.h> |
| 62 | #endif |
| 63 | |
| 64 | #ifndef USE_LDR_ROUTINES |
| 65 | /* Definition of runtime loader structures, found by experimentation. */ |
| 66 | #define RLD_CONTEXT_ADDRESS 0x3ffc0000000 |
| 67 | |
| 68 | /* Per-module information structure referenced by ldr_context_t.head. */ |
| 69 | |
| 70 | typedef struct |
| 71 | { |
| 72 | CORE_ADDR next; |
| 73 | CORE_ADDR previous; |
| 74 | CORE_ADDR unknown1; |
| 75 | CORE_ADDR module_name; |
| 76 | CORE_ADDR modinfo_addr; /* Used by next_link_map_member() to detect |
| 77 | the end of the shared module list. */ |
| 78 | long module_id; |
| 79 | CORE_ADDR unknown2; |
| 80 | CORE_ADDR unknown3; |
| 81 | long region_count; |
| 82 | CORE_ADDR regioninfo_addr; |
| 83 | } |
| 84 | ldr_module_info_t; |
| 85 | |
| 86 | /* Per-region structure referenced by ldr_module_info_t.regioninfo_addr. */ |
| 87 | |
| 88 | typedef struct |
| 89 | { |
| 90 | long unknown1; |
| 91 | CORE_ADDR regionname_addr; |
| 92 | long protection; |
| 93 | CORE_ADDR vaddr; |
| 94 | CORE_ADDR mapaddr; |
| 95 | long size; |
| 96 | long unknown2[5]; |
| 97 | } |
| 98 | ldr_region_info_t; |
| 99 | |
| 100 | /* Structure at RLD_CONTEXT_ADDRESS specifying the start and finish addresses |
| 101 | of the shared module list. */ |
| 102 | |
| 103 | typedef struct |
| 104 | { |
| 105 | CORE_ADDR unknown1; |
| 106 | CORE_ADDR unknown2; |
| 107 | CORE_ADDR head; |
| 108 | CORE_ADDR tail; |
| 109 | } |
| 110 | ldr_context_t; |
| 111 | #endif /* !USE_LDR_ROUTINES */ |
| 112 | |
| 113 | /* Per-section information, stored in struct lm_info.secs. */ |
| 114 | |
| 115 | struct lm_sec |
| 116 | { |
| 117 | CORE_ADDR offset; /* difference between default and actual |
| 118 | virtual addresses of section .name */ |
| 119 | CORE_ADDR nameaddr; /* address in inferior of section name */ |
| 120 | const char *name; /* name of section, null if not fetched */ |
| 121 | }; |
| 122 | |
| 123 | /* Per-module information, stored in struct so_list.lm_info. */ |
| 124 | |
| 125 | struct lm_info |
| 126 | { |
| 127 | int isloader; /* whether the module is /sbin/loader */ |
| 128 | int nsecs; /* length of .secs */ |
| 129 | struct lm_sec secs[1]; /* variable-length array of sections, sorted |
| 130 | by name */ |
| 131 | }; |
| 132 | |
| 133 | /* Context for iterating through the inferior's shared module list. */ |
| 134 | |
| 135 | struct read_map_ctxt |
| 136 | { |
| 137 | #ifdef USE_LDR_ROUTINES |
| 138 | ldr_process_t proc; |
| 139 | ldr_module_t next; |
| 140 | #else |
| 141 | CORE_ADDR next; /* next element in module list */ |
| 142 | CORE_ADDR tail; /* last element in module list */ |
| 143 | #endif |
| 144 | }; |
| 145 | |
| 146 | /* Forward declaration for this module's autoinit function. */ |
| 147 | |
| 148 | extern void _initialize_osf_solib (void); |
| 149 | |
| 150 | #ifdef USE_LDR_ROUTINES |
| 151 | # if 0 |
| 152 | /* This routine is intended to be called by ldr_* routines to read memory from |
| 153 | the current target. Usage: |
| 154 | |
| 155 | ldr_process = ldr_core_process (); |
| 156 | ldr_set_core_reader (ldr_read_memory); |
| 157 | ldr_xdetach (ldr_process); |
| 158 | ldr_xattach (ldr_process); |
| 159 | |
| 160 | ldr_core_process() and ldr_read_memory() are neither documented nor |
| 161 | declared in system header files. They work with OSF/1 2.x, and they might |
| 162 | work with later versions as well. */ |
| 163 | |
| 164 | static int |
| 165 | ldr_read_memory (CORE_ADDR memaddr, char *myaddr, int len, int readstring) |
| 166 | { |
| 167 | int result; |
| 168 | char *buffer; |
| 169 | |
| 170 | if (readstring) |
| 171 | { |
| 172 | target_read_string (memaddr, &buffer, len, &result); |
| 173 | if (result == 0) |
| 174 | strcpy (myaddr, buffer); |
| 175 | xfree (buffer); |
| 176 | } |
| 177 | else |
| 178 | result = target_read_memory (memaddr, myaddr, len); |
| 179 | |
| 180 | if (result != 0) |
| 181 | result = -result; |
| 182 | return result; |
| 183 | } |
| 184 | # endif /* 0 */ |
| 185 | #endif /* USE_LDR_ROUTINES */ |
| 186 | |
| 187 | /* Comparison for qsort() and bsearch(): return -1, 0, or 1 according to |
| 188 | whether lm_sec *P1's name is lexically less than, equal to, or greater |
| 189 | than that of *P2. */ |
| 190 | |
| 191 | static int |
| 192 | lm_sec_cmp (const void *p1, const void *p2) |
| 193 | { |
| 194 | const struct lm_sec *lms1 = p1, *lms2 = p2; |
| 195 | |
| 196 | return strcmp (lms1->name, lms2->name); |
| 197 | } |
| 198 | |
| 199 | /* Sort LMI->secs so that osf_relocate_section_addresses() can binary-search |
| 200 | it. */ |
| 201 | |
| 202 | static void |
| 203 | lm_secs_sort (struct lm_info *lmi) |
| 204 | { |
| 205 | qsort (lmi->secs, lmi->nsecs, sizeof *lmi->secs, lm_sec_cmp); |
| 206 | } |
| 207 | |
| 208 | /* Populate name fields of LMI->secs. */ |
| 209 | |
| 210 | static void |
| 211 | fetch_sec_names (struct lm_info *lmi) |
| 212 | { |
| 213 | #ifndef USE_LDR_ROUTINES |
| 214 | int i, errcode; |
| 215 | struct lm_sec *lms; |
| 216 | char *name; |
| 217 | |
| 218 | for (i = 0; i < lmi->nsecs; i++) |
| 219 | { |
| 220 | lms = lmi->secs + i; |
| 221 | target_read_string (lms->nameaddr, &name, PATH_MAX, &errcode); |
| 222 | if (errcode != 0) |
| 223 | { |
| 224 | warning (_("unable to read shared sec name at 0x%lx"), |
| 225 | lms->nameaddr); |
| 226 | name = xstrdup (""); |
| 227 | } |
| 228 | lms->name = name; |
| 229 | } |
| 230 | lm_secs_sort (lmi); |
| 231 | #endif |
| 232 | } |
| 233 | |
| 234 | /* target_so_ops callback. Adjust SEC's addresses after it's been mapped into |
| 235 | the process. */ |
| 236 | |
| 237 | static void |
| 238 | osf_relocate_section_addresses (struct so_list *so, |
| 239 | struct target_section *sec) |
| 240 | { |
| 241 | struct lm_info *lmi; |
| 242 | struct lm_sec lms_key, *lms; |
| 243 | |
| 244 | /* Fetch SO's section names if we haven't done so already. */ |
| 245 | lmi = so->lm_info; |
| 246 | if (lmi->nsecs && !lmi->secs[0].name) |
| 247 | fetch_sec_names (lmi); |
| 248 | |
| 249 | /* Binary-search for offset information corresponding to SEC. */ |
| 250 | lms_key.name = sec->the_bfd_section->name; |
| 251 | lms = bsearch (&lms_key, lmi->secs, lmi->nsecs, sizeof *lms, lm_sec_cmp); |
| 252 | if (lms) |
| 253 | { |
| 254 | sec->addr += lms->offset; |
| 255 | sec->endaddr += lms->offset; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | /* target_so_ops callback. Free parts of SO allocated by this file. */ |
| 260 | |
| 261 | static void |
| 262 | osf_free_so (struct so_list *so) |
| 263 | { |
| 264 | int i; |
| 265 | const char *name; |
| 266 | |
| 267 | for (i = 0; i < so->lm_info->nsecs; i++) |
| 268 | { |
| 269 | name = so->lm_info->secs[i].name; |
| 270 | if (name) |
| 271 | xfree ((void *) name); |
| 272 | } |
| 273 | xfree (so->lm_info); |
| 274 | } |
| 275 | |
| 276 | /* target_so_ops callback. Discard information accumulated by this file and |
| 277 | not freed by osf_free_so(). */ |
| 278 | |
| 279 | static void |
| 280 | osf_clear_solib (void) |
| 281 | { |
| 282 | return; |
| 283 | } |
| 284 | |
| 285 | /* target_so_ops callback. Prepare to handle shared libraries after the |
| 286 | inferior process has been created but before it's executed any |
| 287 | instructions. |
| 288 | |
| 289 | For a statically bound executable, the inferior's first instruction is the |
| 290 | one at "_start", or a similar text label. No further processing is needed |
| 291 | in that case. |
| 292 | |
| 293 | For a dynamically bound executable, this first instruction is somewhere |
| 294 | in the rld, and the actual user executable is not yet mapped in. |
| 295 | We continue the inferior again, rld then maps in the actual user |
| 296 | executable and any needed shared libraries and then sends |
| 297 | itself a SIGTRAP. |
| 298 | |
| 299 | At that point we discover the names of all shared libraries and |
| 300 | read their symbols in. |
| 301 | |
| 302 | FIXME |
| 303 | |
| 304 | This code does not properly handle hitting breakpoints which the |
| 305 | user might have set in the rld itself. Proper handling would have |
| 306 | to check if the SIGTRAP happened due to a kill call. |
| 307 | |
| 308 | Also, what if child has exit()ed? Must exit loop somehow. */ |
| 309 | |
| 310 | static void |
| 311 | osf_solib_create_inferior_hook (int from_tty) |
| 312 | { |
| 313 | struct inferior *inf; |
| 314 | struct thread_info *tp; |
| 315 | |
| 316 | inf = current_inferior (); |
| 317 | |
| 318 | /* If we are attaching to the inferior, the shared libraries |
| 319 | have already been mapped, so nothing more to do. */ |
| 320 | if (inf->attach_flag) |
| 321 | return; |
| 322 | |
| 323 | /* Nothing to do for statically bound executables. */ |
| 324 | |
| 325 | if (symfile_objfile == NULL |
| 326 | || symfile_objfile->obfd == NULL |
| 327 | || ((bfd_get_file_flags (symfile_objfile->obfd) & DYNAMIC) == 0)) |
| 328 | return; |
| 329 | |
| 330 | /* Now run the target. It will eventually get a SIGTRAP, at |
| 331 | which point all of the libraries will have been mapped in and we |
| 332 | can go groveling around in the rld structures to find |
| 333 | out what we need to know about them. |
| 334 | |
| 335 | If debugging from a core file, we cannot resume the execution |
| 336 | of the inferior. But this is actually not an issue, because |
| 337 | shared libraries have already been mapped anyways, which means |
| 338 | we have nothing more to do. */ |
| 339 | if (!target_can_run (¤t_target)) |
| 340 | return; |
| 341 | |
| 342 | tp = inferior_thread (); |
| 343 | clear_proceed_status (); |
| 344 | inf->control.stop_soon = STOP_QUIETLY; |
| 345 | tp->suspend.stop_signal = TARGET_SIGNAL_0; |
| 346 | do |
| 347 | { |
| 348 | target_resume (minus_one_ptid, 0, tp->suspend.stop_signal); |
| 349 | wait_for_inferior (0); |
| 350 | } |
| 351 | while (tp->suspend.stop_signal != TARGET_SIGNAL_TRAP); |
| 352 | |
| 353 | /* solib_add will call reinit_frame_cache. |
| 354 | But we are stopped in the runtime loader and we do not have symbols |
| 355 | for the runtime loader. So heuristic_proc_start will be called |
| 356 | and will put out an annoying warning. |
| 357 | Delaying the resetting of stop_soon until after symbol loading |
| 358 | suppresses the warning. */ |
| 359 | solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add); |
| 360 | inf->control.stop_soon = NO_STOP_QUIETLY; |
| 361 | } |
| 362 | |
| 363 | /* target_so_ops callback. Do additional symbol handling, lookup, etc. after |
| 364 | symbols for a shared object have been loaded. */ |
| 365 | |
| 366 | static void |
| 367 | osf_special_symbol_handling (void) |
| 368 | { |
| 369 | return; |
| 370 | } |
| 371 | |
| 372 | /* Initialize CTXT in preparation for iterating through the inferior's module |
| 373 | list using read_map(). Return success. */ |
| 374 | |
| 375 | static int |
| 376 | open_map (struct read_map_ctxt *ctxt) |
| 377 | { |
| 378 | #ifdef USE_LDR_ROUTINES |
| 379 | /* Note: As originally written, ldr_my_process() was used to obtain |
| 380 | the value for ctxt->proc. This is incorrect, however, since |
| 381 | ldr_my_process() retrieves the "unique identifier" associated |
| 382 | with the current process (i.e. GDB) and not the one being |
| 383 | debugged. Presumably, the pid of the process being debugged is |
| 384 | compatible with the "unique identifier" used by the ldr_ |
| 385 | routines, so we use that. */ |
| 386 | ctxt->proc = ptid_get_pid (inferior_ptid); |
| 387 | if (ldr_xattach (ctxt->proc) != 0) |
| 388 | return 0; |
| 389 | ctxt->next = LDR_NULL_MODULE; |
| 390 | #else |
| 391 | CORE_ADDR ldr_context_addr, prev, next; |
| 392 | ldr_context_t ldr_context; |
| 393 | |
| 394 | if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS, |
| 395 | (char *) &ldr_context_addr, |
| 396 | sizeof (CORE_ADDR)) != 0) |
| 397 | return 0; |
| 398 | if (target_read_memory (ldr_context_addr, |
| 399 | (char *) &ldr_context, |
| 400 | sizeof (ldr_context_t)) != 0) |
| 401 | return 0; |
| 402 | ctxt->next = ldr_context.head; |
| 403 | ctxt->tail = ldr_context.tail; |
| 404 | #endif |
| 405 | return 1; |
| 406 | } |
| 407 | |
| 408 | /* Initialize SO to have module NAME, /sbin/loader indicator ISLOADR, and |
| 409 | space for NSECS sections. */ |
| 410 | |
| 411 | static void |
| 412 | init_so (struct so_list *so, char *name, int isloader, int nsecs) |
| 413 | { |
| 414 | int namelen, i; |
| 415 | |
| 416 | /* solib.c requires various fields to be initialized to 0. */ |
| 417 | memset (so, 0, sizeof *so); |
| 418 | |
| 419 | /* Copy the name. */ |
| 420 | namelen = strlen (name); |
| 421 | if (namelen >= SO_NAME_MAX_PATH_SIZE) |
| 422 | namelen = SO_NAME_MAX_PATH_SIZE - 1; |
| 423 | |
| 424 | memcpy (so->so_original_name, name, namelen); |
| 425 | so->so_original_name[namelen] = '\0'; |
| 426 | memcpy (so->so_name, so->so_original_name, namelen + 1); |
| 427 | |
| 428 | /* Allocate section space. */ |
| 429 | so->lm_info = xmalloc (sizeof (struct lm_info) |
| 430 | + (nsecs - 1) * sizeof (struct lm_sec)); |
| 431 | so->lm_info->isloader = isloader; |
| 432 | so->lm_info->nsecs = nsecs; |
| 433 | for (i = 0; i < nsecs; i++) |
| 434 | so->lm_info->secs[i].name = NULL; |
| 435 | } |
| 436 | |
| 437 | /* Initialize SO's section SECIDX with name address NAMEADDR, name string |
| 438 | NAME, default virtual address VADDR, and actual virtual address |
| 439 | MAPADDR. */ |
| 440 | |
| 441 | static void |
| 442 | init_sec (struct so_list *so, int secidx, CORE_ADDR nameaddr, |
| 443 | const char *name, CORE_ADDR vaddr, CORE_ADDR mapaddr) |
| 444 | { |
| 445 | struct lm_sec *lms; |
| 446 | |
| 447 | lms = so->lm_info->secs + secidx; |
| 448 | lms->nameaddr = nameaddr; |
| 449 | lms->name = name; |
| 450 | lms->offset = mapaddr - vaddr; |
| 451 | } |
| 452 | |
| 453 | /* If there are more elements starting at CTXT in inferior's module list, |
| 454 | store the next element in SO, advance CTXT to the next element, and return |
| 455 | 1, else return 0. */ |
| 456 | |
| 457 | static int |
| 458 | read_map (struct read_map_ctxt *ctxt, struct so_list *so) |
| 459 | { |
| 460 | ldr_module_info_t minf; |
| 461 | ldr_region_info_t rinf; |
| 462 | |
| 463 | #ifdef USE_LDR_ROUTINES |
| 464 | size_t size; |
| 465 | ldr_region_t i; |
| 466 | |
| 467 | /* Retrieve the next element. */ |
| 468 | if (ldr_next_module (ctxt->proc, &ctxt->next) != 0) |
| 469 | return 0; |
| 470 | if (ctxt->next == LDR_NULL_MODULE) |
| 471 | return 0; |
| 472 | if (ldr_inq_module (ctxt->proc, ctxt->next, &minf, sizeof minf, &size) != 0) |
| 473 | return 0; |
| 474 | |
| 475 | /* Initialize the module name and section count. */ |
| 476 | init_so (so, minf.lmi_name, 0, minf.lmi_nregion); |
| 477 | |
| 478 | /* Retrieve section names and offsets. */ |
| 479 | for (i = 0; i < minf.lmi_nregion; i++) |
| 480 | { |
| 481 | if (ldr_inq_region (ctxt->proc, ctxt->next, i, &rinf, |
| 482 | sizeof rinf, &size) != 0) |
| 483 | goto err; |
| 484 | init_sec (so, (int) i, 0, xstrdup (rinf.lri_name), |
| 485 | (CORE_ADDR) rinf.lri_vaddr, (CORE_ADDR) rinf.lri_mapaddr); |
| 486 | } |
| 487 | lm_secs_sort (so->lm_info); |
| 488 | #else |
| 489 | char *name; |
| 490 | int errcode, i; |
| 491 | |
| 492 | /* Retrieve the next element. */ |
| 493 | if (!ctxt->next) |
| 494 | return 0; |
| 495 | if (target_read_memory (ctxt->next, (char *) &minf, sizeof minf) != 0) |
| 496 | return 0; |
| 497 | if (ctxt->next == ctxt->tail) |
| 498 | ctxt->next = 0; |
| 499 | else |
| 500 | ctxt->next = minf.next; |
| 501 | |
| 502 | /* Initialize the module name and section count. */ |
| 503 | target_read_string (minf.module_name, &name, PATH_MAX, &errcode); |
| 504 | if (errcode != 0) |
| 505 | return 0; |
| 506 | init_so (so, name, !minf.modinfo_addr, minf.region_count); |
| 507 | xfree (name); |
| 508 | |
| 509 | /* Retrieve section names and offsets. */ |
| 510 | for (i = 0; i < minf.region_count; i++) |
| 511 | { |
| 512 | if (target_read_memory (minf.regioninfo_addr + i * sizeof rinf, |
| 513 | (char *) &rinf, sizeof rinf) != 0) |
| 514 | goto err; |
| 515 | init_sec (so, i, rinf.regionname_addr, NULL, rinf.vaddr, rinf.mapaddr); |
| 516 | } |
| 517 | #endif /* !USE_LDR_ROUTINES */ |
| 518 | return 1; |
| 519 | |
| 520 | err: |
| 521 | osf_free_so (so); |
| 522 | return 0; |
| 523 | } |
| 524 | |
| 525 | /* Free resources allocated by open_map (CTXT). */ |
| 526 | |
| 527 | static void |
| 528 | close_map (struct read_map_ctxt *ctxt) |
| 529 | { |
| 530 | #ifdef USE_LDR_ROUTINES |
| 531 | ldr_xdetach (ctxt->proc); |
| 532 | #endif |
| 533 | } |
| 534 | |
| 535 | /* target_so_ops callback. Return a list of shared objects currently loaded |
| 536 | in the inferior. */ |
| 537 | |
| 538 | static struct so_list * |
| 539 | osf_current_sos (void) |
| 540 | { |
| 541 | struct so_list *head = NULL, *tail = NULL, *newtail, so; |
| 542 | struct read_map_ctxt ctxt; |
| 543 | int skipped_main; |
| 544 | |
| 545 | if (!open_map (&ctxt)) |
| 546 | return NULL; |
| 547 | |
| 548 | /* Read subsequent elements. */ |
| 549 | for (skipped_main = 0;;) |
| 550 | { |
| 551 | if (!read_map (&ctxt, &so)) |
| 552 | break; |
| 553 | |
| 554 | /* Skip the main program module, which is first in the list after |
| 555 | /sbin/loader. */ |
| 556 | if (!so.lm_info->isloader && !skipped_main) |
| 557 | { |
| 558 | osf_free_so (&so); |
| 559 | skipped_main = 1; |
| 560 | continue; |
| 561 | } |
| 562 | |
| 563 | newtail = xmalloc (sizeof *newtail); |
| 564 | if (!head) |
| 565 | head = newtail; |
| 566 | else |
| 567 | tail->next = newtail; |
| 568 | tail = newtail; |
| 569 | |
| 570 | memcpy (tail, &so, sizeof so); |
| 571 | tail->next = NULL; |
| 572 | } |
| 573 | |
| 574 | close_map (&ctxt); |
| 575 | return head; |
| 576 | } |
| 577 | |
| 578 | /* target_so_ops callback. Attempt to locate and open the main symbol |
| 579 | file. */ |
| 580 | |
| 581 | static int |
| 582 | osf_open_symbol_file_object (void *from_ttyp) |
| 583 | { |
| 584 | struct read_map_ctxt ctxt; |
| 585 | struct so_list so; |
| 586 | int found; |
| 587 | |
| 588 | if (symfile_objfile) |
| 589 | if (!query (_("Attempt to reload symbols from process? "))) |
| 590 | return 0; |
| 591 | |
| 592 | /* The first module after /sbin/loader is the main program. */ |
| 593 | if (!open_map (&ctxt)) |
| 594 | return 0; |
| 595 | for (found = 0; !found;) |
| 596 | { |
| 597 | if (!read_map (&ctxt, &so)) |
| 598 | break; |
| 599 | found = !so.lm_info->isloader; |
| 600 | osf_free_so (&so); |
| 601 | } |
| 602 | close_map (&ctxt); |
| 603 | |
| 604 | if (found) |
| 605 | symbol_file_add_main (so.so_name, *(int *) from_ttyp); |
| 606 | return found; |
| 607 | } |
| 608 | |
| 609 | /* target_so_ops callback. Return whether PC is in the dynamic linker. */ |
| 610 | |
| 611 | static int |
| 612 | osf_in_dynsym_resolve_code (CORE_ADDR pc) |
| 613 | { |
| 614 | /* This function currently always return False. This is a temporary |
| 615 | solution which only consequence is to introduce a minor incovenience |
| 616 | for the user: When stepping inside a subprogram located in a shared |
| 617 | library, gdb might stop inside the dynamic loader code instead of |
| 618 | inside the subprogram itself. See the explanations in infrun.c about |
| 619 | the in_solib_dynsym_resolve_code() function for more details. */ |
| 620 | return 0; |
| 621 | } |
| 622 | |
| 623 | static struct target_so_ops osf_so_ops; |
| 624 | |
| 625 | void |
| 626 | _initialize_osf_solib (void) |
| 627 | { |
| 628 | osf_so_ops.relocate_section_addresses = osf_relocate_section_addresses; |
| 629 | osf_so_ops.free_so = osf_free_so; |
| 630 | osf_so_ops.clear_solib = osf_clear_solib; |
| 631 | osf_so_ops.solib_create_inferior_hook = osf_solib_create_inferior_hook; |
| 632 | osf_so_ops.special_symbol_handling = osf_special_symbol_handling; |
| 633 | osf_so_ops.current_sos = osf_current_sos; |
| 634 | osf_so_ops.open_symbol_file_object = osf_open_symbol_file_object; |
| 635 | osf_so_ops.in_dynsym_resolve_code = osf_in_dynsym_resolve_code; |
| 636 | osf_so_ops.bfd_open = solib_bfd_open; |
| 637 | |
| 638 | /* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */ |
| 639 | current_target_so_ops = &osf_so_ops; |
| 640 | } |