| 1 | /* Handle OSF/1, Digital UNIX, and Tru64 shared libraries |
| 2 | for GDB, the GNU Debugger. |
| 3 | Copyright (C) 1993-2014 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | /* When handling shared libraries, GDB has to find out the pathnames |
| 21 | of all shared libraries that are currently loaded (to read in their |
| 22 | symbols) and where the shared libraries are loaded in memory |
| 23 | (to relocate them properly from their prelinked addresses to the |
| 24 | current load address). |
| 25 | |
| 26 | Under OSF/1 there are two possibilities to get at this information: |
| 27 | |
| 28 | 1) Peek around in the runtime loader structures. |
| 29 | These are not documented, and they are not defined in the system |
| 30 | header files. The definitions below were obtained by experimentation, |
| 31 | but they seem stable enough. |
| 32 | |
| 33 | 2) Use the libxproc.a library, which contains the equivalent ldr_* |
| 34 | routines. The library is documented in Tru64 5.x, but as of 5.1, it |
| 35 | only allows a process to examine itself. On earlier versions, it |
| 36 | may require that the GDB executable be dynamically linked and that |
| 37 | NAT_CLIBS include -lxproc -Wl,-expect_unresolved,ldr_process_context |
| 38 | for GDB and all applications that are using libgdb. |
| 39 | |
| 40 | We will use the peeking approach until libxproc.a works for other |
| 41 | processes. */ |
| 42 | |
| 43 | #include "defs.h" |
| 44 | |
| 45 | #include <sys/types.h> |
| 46 | #include <signal.h> |
| 47 | #include <string.h> |
| 48 | |
| 49 | #include "bfd.h" |
| 50 | #include "symtab.h" |
| 51 | #include "symfile.h" |
| 52 | #include "objfiles.h" |
| 53 | #include "target.h" |
| 54 | #include "inferior.h" |
| 55 | #include "gdbthread.h" |
| 56 | #include "solist.h" |
| 57 | #include "solib.h" |
| 58 | |
| 59 | #ifdef USE_LDR_ROUTINES |
| 60 | # include <loader.h> |
| 61 | #endif |
| 62 | |
| 63 | #ifndef USE_LDR_ROUTINES |
| 64 | /* Definition of runtime loader structures, found by experimentation. */ |
| 65 | #define RLD_CONTEXT_ADDRESS 0x3ffc0000000 |
| 66 | |
| 67 | /* Per-module information structure referenced by ldr_context_t.head. */ |
| 68 | |
| 69 | typedef struct |
| 70 | { |
| 71 | CORE_ADDR next; |
| 72 | CORE_ADDR previous; |
| 73 | CORE_ADDR unknown1; |
| 74 | CORE_ADDR module_name; |
| 75 | CORE_ADDR modinfo_addr; /* Used by next_link_map_member() to detect |
| 76 | the end of the shared module list. */ |
| 77 | long module_id; |
| 78 | CORE_ADDR unknown2; |
| 79 | CORE_ADDR unknown3; |
| 80 | long region_count; |
| 81 | CORE_ADDR regioninfo_addr; |
| 82 | } |
| 83 | ldr_module_info_t; |
| 84 | |
| 85 | /* Per-region structure referenced by ldr_module_info_t.regioninfo_addr. */ |
| 86 | |
| 87 | typedef struct |
| 88 | { |
| 89 | long unknown1; |
| 90 | CORE_ADDR regionname_addr; |
| 91 | long protection; |
| 92 | CORE_ADDR vaddr; |
| 93 | CORE_ADDR mapaddr; |
| 94 | long size; |
| 95 | long unknown2[5]; |
| 96 | } |
| 97 | ldr_region_info_t; |
| 98 | |
| 99 | /* Structure at RLD_CONTEXT_ADDRESS specifying the start and finish addresses |
| 100 | of the shared module list. */ |
| 101 | |
| 102 | typedef struct |
| 103 | { |
| 104 | CORE_ADDR unknown1; |
| 105 | CORE_ADDR unknown2; |
| 106 | CORE_ADDR head; |
| 107 | CORE_ADDR tail; |
| 108 | } |
| 109 | ldr_context_t; |
| 110 | #endif /* !USE_LDR_ROUTINES */ |
| 111 | |
| 112 | /* Per-section information, stored in struct lm_info.secs. */ |
| 113 | |
| 114 | struct lm_sec |
| 115 | { |
| 116 | CORE_ADDR offset; /* difference between default and actual |
| 117 | virtual addresses of section .name */ |
| 118 | CORE_ADDR nameaddr; /* address in inferior of section name */ |
| 119 | const char *name; /* name of section, null if not fetched */ |
| 120 | }; |
| 121 | |
| 122 | /* Per-module information, stored in struct so_list.lm_info. */ |
| 123 | |
| 124 | struct lm_info |
| 125 | { |
| 126 | int isloader; /* whether the module is /sbin/loader */ |
| 127 | int nsecs; /* length of .secs */ |
| 128 | struct lm_sec secs[1]; /* variable-length array of sections, sorted |
| 129 | by name */ |
| 130 | }; |
| 131 | |
| 132 | /* Context for iterating through the inferior's shared module list. */ |
| 133 | |
| 134 | struct read_map_ctxt |
| 135 | { |
| 136 | #ifdef USE_LDR_ROUTINES |
| 137 | ldr_process_t proc; |
| 138 | ldr_module_t next; |
| 139 | #else |
| 140 | CORE_ADDR next; /* next element in module list */ |
| 141 | CORE_ADDR tail; /* last element in module list */ |
| 142 | #endif |
| 143 | }; |
| 144 | |
| 145 | /* Forward declaration for this module's autoinit function. */ |
| 146 | |
| 147 | extern void _initialize_osf_solib (void); |
| 148 | |
| 149 | #ifdef USE_LDR_ROUTINES |
| 150 | # if 0 |
| 151 | /* This routine is intended to be called by ldr_* routines to read memory from |
| 152 | the current target. Usage: |
| 153 | |
| 154 | ldr_process = ldr_core_process (); |
| 155 | ldr_set_core_reader (ldr_read_memory); |
| 156 | ldr_xdetach (ldr_process); |
| 157 | ldr_xattach (ldr_process); |
| 158 | |
| 159 | ldr_core_process() and ldr_read_memory() are neither documented nor |
| 160 | declared in system header files. They work with OSF/1 2.x, and they might |
| 161 | work with later versions as well. */ |
| 162 | |
| 163 | static int |
| 164 | ldr_read_memory (CORE_ADDR memaddr, char *myaddr, int len, int readstring) |
| 165 | { |
| 166 | int result; |
| 167 | char *buffer; |
| 168 | |
| 169 | if (readstring) |
| 170 | { |
| 171 | target_read_string (memaddr, &buffer, len, &result); |
| 172 | if (result == 0) |
| 173 | strcpy (myaddr, buffer); |
| 174 | xfree (buffer); |
| 175 | } |
| 176 | else |
| 177 | result = target_read_memory (memaddr, myaddr, len); |
| 178 | |
| 179 | if (result != 0) |
| 180 | result = -result; |
| 181 | return result; |
| 182 | } |
| 183 | # endif /* 0 */ |
| 184 | #endif /* USE_LDR_ROUTINES */ |
| 185 | |
| 186 | /* Comparison for qsort() and bsearch(): return -1, 0, or 1 according to |
| 187 | whether lm_sec *P1's name is lexically less than, equal to, or greater |
| 188 | than that of *P2. */ |
| 189 | |
| 190 | static int |
| 191 | lm_sec_cmp (const void *p1, const void *p2) |
| 192 | { |
| 193 | const struct lm_sec *lms1 = p1, *lms2 = p2; |
| 194 | |
| 195 | return strcmp (lms1->name, lms2->name); |
| 196 | } |
| 197 | |
| 198 | /* Sort LMI->secs so that osf_relocate_section_addresses() can binary-search |
| 199 | it. */ |
| 200 | |
| 201 | static void |
| 202 | lm_secs_sort (struct lm_info *lmi) |
| 203 | { |
| 204 | qsort (lmi->secs, lmi->nsecs, sizeof *lmi->secs, lm_sec_cmp); |
| 205 | } |
| 206 | |
| 207 | /* Populate name fields of LMI->secs. */ |
| 208 | |
| 209 | static void |
| 210 | fetch_sec_names (struct lm_info *lmi) |
| 211 | { |
| 212 | #ifndef USE_LDR_ROUTINES |
| 213 | int i, errcode; |
| 214 | struct lm_sec *lms; |
| 215 | char *name; |
| 216 | |
| 217 | for (i = 0; i < lmi->nsecs; i++) |
| 218 | { |
| 219 | lms = lmi->secs + i; |
| 220 | target_read_string (lms->nameaddr, &name, PATH_MAX, &errcode); |
| 221 | if (errcode != 0) |
| 222 | { |
| 223 | warning (_("unable to read shared sec name at 0x%lx"), |
| 224 | lms->nameaddr); |
| 225 | name = xstrdup (""); |
| 226 | } |
| 227 | lms->name = name; |
| 228 | } |
| 229 | lm_secs_sort (lmi); |
| 230 | #endif |
| 231 | } |
| 232 | |
| 233 | /* target_so_ops callback. Adjust SEC's addresses after it's been mapped into |
| 234 | the process. */ |
| 235 | |
| 236 | static void |
| 237 | osf_relocate_section_addresses (struct so_list *so, |
| 238 | struct target_section *sec) |
| 239 | { |
| 240 | struct lm_info *lmi; |
| 241 | struct lm_sec lms_key, *lms; |
| 242 | |
| 243 | /* Fetch SO's section names if we haven't done so already. */ |
| 244 | lmi = so->lm_info; |
| 245 | if (lmi->nsecs && !lmi->secs[0].name) |
| 246 | fetch_sec_names (lmi); |
| 247 | |
| 248 | /* Binary-search for offset information corresponding to SEC. */ |
| 249 | lms_key.name = sec->the_bfd_section->name; |
| 250 | lms = bsearch (&lms_key, lmi->secs, lmi->nsecs, sizeof *lms, lm_sec_cmp); |
| 251 | if (lms) |
| 252 | { |
| 253 | sec->addr += lms->offset; |
| 254 | sec->endaddr += lms->offset; |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | /* target_so_ops callback. Free parts of SO allocated by this file. */ |
| 259 | |
| 260 | static void |
| 261 | osf_free_so (struct so_list *so) |
| 262 | { |
| 263 | int i; |
| 264 | const char *name; |
| 265 | |
| 266 | for (i = 0; i < so->lm_info->nsecs; i++) |
| 267 | { |
| 268 | name = so->lm_info->secs[i].name; |
| 269 | if (name) |
| 270 | xfree ((void *) name); |
| 271 | } |
| 272 | xfree (so->lm_info); |
| 273 | } |
| 274 | |
| 275 | /* target_so_ops callback. Discard information accumulated by this file and |
| 276 | not freed by osf_free_so(). */ |
| 277 | |
| 278 | static void |
| 279 | osf_clear_solib (void) |
| 280 | { |
| 281 | return; |
| 282 | } |
| 283 | |
| 284 | /* target_so_ops callback. Prepare to handle shared libraries after the |
| 285 | inferior process has been created but before it's executed any |
| 286 | instructions. |
| 287 | |
| 288 | For a statically bound executable, the inferior's first instruction is the |
| 289 | one at "_start", or a similar text label. No further processing is needed |
| 290 | in that case. |
| 291 | |
| 292 | For a dynamically bound executable, this first instruction is somewhere |
| 293 | in the rld, and the actual user executable is not yet mapped in. |
| 294 | We continue the inferior again, rld then maps in the actual user |
| 295 | executable and any needed shared libraries and then sends |
| 296 | itself a SIGTRAP. |
| 297 | |
| 298 | At that point we discover the names of all shared libraries and |
| 299 | read their symbols in. |
| 300 | |
| 301 | FIXME |
| 302 | |
| 303 | This code does not properly handle hitting breakpoints which the |
| 304 | user might have set in the rld itself. Proper handling would have |
| 305 | to check if the SIGTRAP happened due to a kill call. |
| 306 | |
| 307 | Also, what if child has exit()ed? Must exit loop somehow. */ |
| 308 | |
| 309 | static void |
| 310 | osf_solib_create_inferior_hook (int from_tty) |
| 311 | { |
| 312 | struct inferior *inf; |
| 313 | struct thread_info *tp; |
| 314 | |
| 315 | inf = current_inferior (); |
| 316 | |
| 317 | /* If we are attaching to the inferior, the shared libraries |
| 318 | have already been mapped, so nothing more to do. */ |
| 319 | if (inf->attach_flag) |
| 320 | return; |
| 321 | |
| 322 | /* Nothing to do for statically bound executables. */ |
| 323 | |
| 324 | if (symfile_objfile == NULL |
| 325 | || symfile_objfile->obfd == NULL |
| 326 | || ((bfd_get_file_flags (symfile_objfile->obfd) & DYNAMIC) == 0)) |
| 327 | return; |
| 328 | |
| 329 | /* Now run the target. It will eventually get a SIGTRAP, at |
| 330 | which point all of the libraries will have been mapped in and we |
| 331 | can go groveling around in the rld structures to find |
| 332 | out what we need to know about them. |
| 333 | |
| 334 | If debugging from a core file, we cannot resume the execution |
| 335 | of the inferior. But this is actually not an issue, because |
| 336 | shared libraries have already been mapped anyways, which means |
| 337 | we have nothing more to do. */ |
| 338 | if (!target_can_run (¤t_target)) |
| 339 | return; |
| 340 | |
| 341 | tp = inferior_thread (); |
| 342 | clear_proceed_status (); |
| 343 | inf->control.stop_soon = STOP_QUIETLY; |
| 344 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
| 345 | do |
| 346 | { |
| 347 | target_resume (minus_one_ptid, 0, tp->suspend.stop_signal); |
| 348 | wait_for_inferior (); |
| 349 | } |
| 350 | while (tp->suspend.stop_signal != GDB_SIGNAL_TRAP); |
| 351 | |
| 352 | /* solib_add will call reinit_frame_cache. |
| 353 | But we are stopped in the runtime loader and we do not have symbols |
| 354 | for the runtime loader. So heuristic_proc_start will be called |
| 355 | and will put out an annoying warning. |
| 356 | Delaying the resetting of stop_soon until after symbol loading |
| 357 | suppresses the warning. */ |
| 358 | solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add); |
| 359 | inf->control.stop_soon = NO_STOP_QUIETLY; |
| 360 | } |
| 361 | |
| 362 | /* target_so_ops callback. Do additional symbol handling, lookup, etc. after |
| 363 | symbols for a shared object have been loaded. */ |
| 364 | |
| 365 | static void |
| 366 | osf_special_symbol_handling (void) |
| 367 | { |
| 368 | return; |
| 369 | } |
| 370 | |
| 371 | /* Initialize CTXT in preparation for iterating through the inferior's module |
| 372 | list using read_map(). Return success. */ |
| 373 | |
| 374 | static int |
| 375 | open_map (struct read_map_ctxt *ctxt) |
| 376 | { |
| 377 | #ifdef USE_LDR_ROUTINES |
| 378 | /* Note: As originally written, ldr_my_process() was used to obtain |
| 379 | the value for ctxt->proc. This is incorrect, however, since |
| 380 | ldr_my_process() retrieves the "unique identifier" associated |
| 381 | with the current process (i.e. GDB) and not the one being |
| 382 | debugged. Presumably, the pid of the process being debugged is |
| 383 | compatible with the "unique identifier" used by the ldr_ |
| 384 | routines, so we use that. */ |
| 385 | ctxt->proc = ptid_get_pid (inferior_ptid); |
| 386 | if (ldr_xattach (ctxt->proc) != 0) |
| 387 | return 0; |
| 388 | ctxt->next = LDR_NULL_MODULE; |
| 389 | #else |
| 390 | CORE_ADDR ldr_context_addr, prev, next; |
| 391 | ldr_context_t ldr_context; |
| 392 | |
| 393 | if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS, |
| 394 | (char *) &ldr_context_addr, |
| 395 | sizeof (CORE_ADDR)) != 0) |
| 396 | return 0; |
| 397 | if (target_read_memory (ldr_context_addr, |
| 398 | (char *) &ldr_context, |
| 399 | sizeof (ldr_context_t)) != 0) |
| 400 | return 0; |
| 401 | ctxt->next = ldr_context.head; |
| 402 | ctxt->tail = ldr_context.tail; |
| 403 | #endif |
| 404 | return 1; |
| 405 | } |
| 406 | |
| 407 | /* Initialize SO to have module NAME, /sbin/loader indicator ISLOADR, and |
| 408 | space for NSECS sections. */ |
| 409 | |
| 410 | static void |
| 411 | init_so (struct so_list *so, char *name, int isloader, int nsecs) |
| 412 | { |
| 413 | int namelen, i; |
| 414 | |
| 415 | /* solib.c requires various fields to be initialized to 0. */ |
| 416 | memset (so, 0, sizeof *so); |
| 417 | |
| 418 | /* Copy the name. */ |
| 419 | namelen = strlen (name); |
| 420 | if (namelen >= SO_NAME_MAX_PATH_SIZE) |
| 421 | namelen = SO_NAME_MAX_PATH_SIZE - 1; |
| 422 | |
| 423 | memcpy (so->so_original_name, name, namelen); |
| 424 | so->so_original_name[namelen] = '\0'; |
| 425 | memcpy (so->so_name, so->so_original_name, namelen + 1); |
| 426 | |
| 427 | /* Allocate section space. */ |
| 428 | so->lm_info = xmalloc (sizeof (struct lm_info) |
| 429 | + (nsecs - 1) * sizeof (struct lm_sec)); |
| 430 | so->lm_info->isloader = isloader; |
| 431 | so->lm_info->nsecs = nsecs; |
| 432 | for (i = 0; i < nsecs; i++) |
| 433 | so->lm_info->secs[i].name = NULL; |
| 434 | } |
| 435 | |
| 436 | /* Initialize SO's section SECIDX with name address NAMEADDR, name string |
| 437 | NAME, default virtual address VADDR, and actual virtual address |
| 438 | MAPADDR. */ |
| 439 | |
| 440 | static void |
| 441 | init_sec (struct so_list *so, int secidx, CORE_ADDR nameaddr, |
| 442 | const char *name, CORE_ADDR vaddr, CORE_ADDR mapaddr) |
| 443 | { |
| 444 | struct lm_sec *lms; |
| 445 | |
| 446 | lms = so->lm_info->secs + secidx; |
| 447 | lms->nameaddr = nameaddr; |
| 448 | lms->name = name; |
| 449 | lms->offset = mapaddr - vaddr; |
| 450 | } |
| 451 | |
| 452 | /* If there are more elements starting at CTXT in inferior's module list, |
| 453 | store the next element in SO, advance CTXT to the next element, and return |
| 454 | 1, else return 0. */ |
| 455 | |
| 456 | static int |
| 457 | read_map (struct read_map_ctxt *ctxt, struct so_list *so) |
| 458 | { |
| 459 | ldr_module_info_t minf; |
| 460 | ldr_region_info_t rinf; |
| 461 | |
| 462 | #ifdef USE_LDR_ROUTINES |
| 463 | size_t size; |
| 464 | ldr_region_t i; |
| 465 | |
| 466 | /* Retrieve the next element. */ |
| 467 | if (ldr_next_module (ctxt->proc, &ctxt->next) != 0) |
| 468 | return 0; |
| 469 | if (ctxt->next == LDR_NULL_MODULE) |
| 470 | return 0; |
| 471 | if (ldr_inq_module (ctxt->proc, ctxt->next, &minf, sizeof minf, &size) != 0) |
| 472 | return 0; |
| 473 | |
| 474 | /* Initialize the module name and section count. */ |
| 475 | init_so (so, minf.lmi_name, 0, minf.lmi_nregion); |
| 476 | |
| 477 | /* Retrieve section names and offsets. */ |
| 478 | for (i = 0; i < minf.lmi_nregion; i++) |
| 479 | { |
| 480 | if (ldr_inq_region (ctxt->proc, ctxt->next, i, &rinf, |
| 481 | sizeof rinf, &size) != 0) |
| 482 | goto err; |
| 483 | init_sec (so, (int) i, 0, xstrdup (rinf.lri_name), |
| 484 | (CORE_ADDR) rinf.lri_vaddr, (CORE_ADDR) rinf.lri_mapaddr); |
| 485 | } |
| 486 | lm_secs_sort (so->lm_info); |
| 487 | #else |
| 488 | char *name; |
| 489 | int errcode, i; |
| 490 | |
| 491 | /* Retrieve the next element. */ |
| 492 | if (!ctxt->next) |
| 493 | return 0; |
| 494 | if (target_read_memory (ctxt->next, (char *) &minf, sizeof minf) != 0) |
| 495 | return 0; |
| 496 | if (ctxt->next == ctxt->tail) |
| 497 | ctxt->next = 0; |
| 498 | else |
| 499 | ctxt->next = minf.next; |
| 500 | |
| 501 | /* Initialize the module name and section count. */ |
| 502 | target_read_string (minf.module_name, &name, PATH_MAX, &errcode); |
| 503 | if (errcode != 0) |
| 504 | return 0; |
| 505 | init_so (so, name, !minf.modinfo_addr, minf.region_count); |
| 506 | xfree (name); |
| 507 | |
| 508 | /* Retrieve section names and offsets. */ |
| 509 | for (i = 0; i < minf.region_count; i++) |
| 510 | { |
| 511 | if (target_read_memory (minf.regioninfo_addr + i * sizeof rinf, |
| 512 | (char *) &rinf, sizeof rinf) != 0) |
| 513 | goto err; |
| 514 | init_sec (so, i, rinf.regionname_addr, NULL, rinf.vaddr, rinf.mapaddr); |
| 515 | } |
| 516 | #endif /* !USE_LDR_ROUTINES */ |
| 517 | return 1; |
| 518 | |
| 519 | err: |
| 520 | osf_free_so (so); |
| 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | /* Free resources allocated by open_map (CTXT). */ |
| 525 | |
| 526 | static void |
| 527 | close_map (struct read_map_ctxt *ctxt) |
| 528 | { |
| 529 | #ifdef USE_LDR_ROUTINES |
| 530 | ldr_xdetach (ctxt->proc); |
| 531 | #endif |
| 532 | } |
| 533 | |
| 534 | /* target_so_ops callback. Return a list of shared objects currently loaded |
| 535 | in the inferior. */ |
| 536 | |
| 537 | static struct so_list * |
| 538 | osf_current_sos (void) |
| 539 | { |
| 540 | struct so_list *head = NULL, *tail = NULL, *newtail, so; |
| 541 | struct read_map_ctxt ctxt; |
| 542 | int skipped_main; |
| 543 | |
| 544 | if (!open_map (&ctxt)) |
| 545 | return NULL; |
| 546 | |
| 547 | /* Read subsequent elements. */ |
| 548 | for (skipped_main = 0;;) |
| 549 | { |
| 550 | if (!read_map (&ctxt, &so)) |
| 551 | break; |
| 552 | |
| 553 | /* Skip the main program module, which is first in the list after |
| 554 | /sbin/loader. */ |
| 555 | if (!so.lm_info->isloader && !skipped_main) |
| 556 | { |
| 557 | osf_free_so (&so); |
| 558 | skipped_main = 1; |
| 559 | continue; |
| 560 | } |
| 561 | |
| 562 | newtail = xmalloc (sizeof *newtail); |
| 563 | if (!head) |
| 564 | head = newtail; |
| 565 | else |
| 566 | tail->next = newtail; |
| 567 | tail = newtail; |
| 568 | |
| 569 | memcpy (tail, &so, sizeof so); |
| 570 | tail->next = NULL; |
| 571 | } |
| 572 | |
| 573 | close_map (&ctxt); |
| 574 | return head; |
| 575 | } |
| 576 | |
| 577 | /* target_so_ops callback. Attempt to locate and open the main symbol |
| 578 | file. */ |
| 579 | |
| 580 | static int |
| 581 | osf_open_symbol_file_object (void *from_ttyp) |
| 582 | { |
| 583 | struct read_map_ctxt ctxt; |
| 584 | struct so_list so; |
| 585 | int found; |
| 586 | |
| 587 | if (symfile_objfile) |
| 588 | if (!query (_("Attempt to reload symbols from process? "))) |
| 589 | return 0; |
| 590 | |
| 591 | /* The first module after /sbin/loader is the main program. */ |
| 592 | if (!open_map (&ctxt)) |
| 593 | return 0; |
| 594 | for (found = 0; !found;) |
| 595 | { |
| 596 | if (!read_map (&ctxt, &so)) |
| 597 | break; |
| 598 | found = !so.lm_info->isloader; |
| 599 | osf_free_so (&so); |
| 600 | } |
| 601 | close_map (&ctxt); |
| 602 | |
| 603 | if (found) |
| 604 | symbol_file_add_main (so.so_name, *(int *) from_ttyp); |
| 605 | return found; |
| 606 | } |
| 607 | |
| 608 | /* target_so_ops callback. Return whether PC is in the dynamic linker. */ |
| 609 | |
| 610 | static int |
| 611 | osf_in_dynsym_resolve_code (CORE_ADDR pc) |
| 612 | { |
| 613 | /* This function currently always return False. This is a temporary |
| 614 | solution which only consequence is to introduce a minor incovenience |
| 615 | for the user: When stepping inside a subprogram located in a shared |
| 616 | library, gdb might stop inside the dynamic loader code instead of |
| 617 | inside the subprogram itself. See the explanations in infrun.c about |
| 618 | the in_solib_dynsym_resolve_code() function for more details. */ |
| 619 | return 0; |
| 620 | } |
| 621 | |
| 622 | static struct target_so_ops osf_so_ops; |
| 623 | |
| 624 | void |
| 625 | _initialize_osf_solib (void) |
| 626 | { |
| 627 | osf_so_ops.relocate_section_addresses = osf_relocate_section_addresses; |
| 628 | osf_so_ops.free_so = osf_free_so; |
| 629 | osf_so_ops.clear_solib = osf_clear_solib; |
| 630 | osf_so_ops.solib_create_inferior_hook = osf_solib_create_inferior_hook; |
| 631 | osf_so_ops.special_symbol_handling = osf_special_symbol_handling; |
| 632 | osf_so_ops.current_sos = osf_current_sos; |
| 633 | osf_so_ops.open_symbol_file_object = osf_open_symbol_file_object; |
| 634 | osf_so_ops.in_dynsym_resolve_code = osf_in_dynsym_resolve_code; |
| 635 | osf_so_ops.bfd_open = solib_bfd_open; |
| 636 | |
| 637 | /* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */ |
| 638 | current_target_so_ops = &osf_so_ops; |
| 639 | } |