| 1 | /* Handle OSF/1 shared libraries for GDB, the GNU Debugger. |
| 2 | Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000 |
| 3 | 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | /* FIXME: Most of this code could be merged with solib.c by using |
| 23 | next_link_map_member and xfer_link_map_member in solib.c. */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | |
| 27 | #include <sys/types.h> |
| 28 | #include <signal.h> |
| 29 | #include "gdb_string.h" |
| 30 | #include <fcntl.h> |
| 31 | |
| 32 | #include "symtab.h" |
| 33 | #include "bfd.h" |
| 34 | #include "symfile.h" |
| 35 | #include "objfiles.h" |
| 36 | #include "gdbcore.h" |
| 37 | #include "command.h" |
| 38 | #include "target.h" |
| 39 | #include "frame.h" |
| 40 | #include "gdb_regex.h" |
| 41 | #include "inferior.h" |
| 42 | #include "language.h" |
| 43 | #include "gdbcmd.h" |
| 44 | |
| 45 | #define MAX_PATH_SIZE 1024 /* FIXME: Should be dynamic */ |
| 46 | |
| 47 | /* When handling shared libraries, GDB has to find out the pathnames |
| 48 | of all shared libraries that are currently loaded (to read in their |
| 49 | symbols) and where the shared libraries are loaded in memory |
| 50 | (to relocate them properly from their prelinked addresses to the |
| 51 | current load address). |
| 52 | |
| 53 | Under OSF/1 there are two possibilities to get at this information: |
| 54 | 1) Peek around in the runtime loader structures. |
| 55 | These are not documented, and they are not defined in the system |
| 56 | header files. The definitions below were obtained by experimentation, |
| 57 | but they seem stable enough. |
| 58 | 2) Use the undocumented libxproc.a library, which contains the |
| 59 | equivalent ldr_* routines. |
| 60 | This approach is somewhat cleaner, but it requires that the GDB |
| 61 | executable is dynamically linked. In addition it requires a |
| 62 | NAT_CLIBS= -lxproc -Wl,-expect_unresolved,ldr_process_context |
| 63 | linker specification for GDB and all applications that are using |
| 64 | libgdb. |
| 65 | We will use the peeking approach until it becomes unwieldy. */ |
| 66 | |
| 67 | #ifndef USE_LDR_ROUTINES |
| 68 | |
| 69 | /* Definition of runtime loader structures, found by experimentation. */ |
| 70 | #define RLD_CONTEXT_ADDRESS 0x3ffc0000000 |
| 71 | |
| 72 | typedef struct |
| 73 | { |
| 74 | CORE_ADDR next; |
| 75 | CORE_ADDR previous; |
| 76 | CORE_ADDR unknown1; |
| 77 | char *module_name; |
| 78 | CORE_ADDR modinfo_addr; |
| 79 | long module_id; |
| 80 | CORE_ADDR unknown2; |
| 81 | CORE_ADDR unknown3; |
| 82 | long region_count; |
| 83 | CORE_ADDR regioninfo_addr; |
| 84 | } |
| 85 | ldr_module_info_t; |
| 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 | typedef struct |
| 100 | { |
| 101 | CORE_ADDR unknown1; |
| 102 | CORE_ADDR unknown2; |
| 103 | CORE_ADDR head; |
| 104 | CORE_ADDR tail; |
| 105 | } |
| 106 | ldr_context_t; |
| 107 | |
| 108 | static ldr_context_t ldr_context; |
| 109 | |
| 110 | #else |
| 111 | |
| 112 | #include <loader.h> |
| 113 | static ldr_process_t fake_ldr_process; |
| 114 | |
| 115 | /* Called by ldr_* routines to read memory from the current target. */ |
| 116 | |
| 117 | static int ldr_read_memory (CORE_ADDR, char *, int, int); |
| 118 | |
| 119 | static int |
| 120 | ldr_read_memory (CORE_ADDR memaddr, char *myaddr, int len, int readstring) |
| 121 | { |
| 122 | int result; |
| 123 | char *buffer; |
| 124 | |
| 125 | if (readstring) |
| 126 | { |
| 127 | target_read_string (memaddr, &buffer, len, &result); |
| 128 | if (result == 0) |
| 129 | strcpy (myaddr, buffer); |
| 130 | xfree (buffer); |
| 131 | } |
| 132 | else |
| 133 | result = target_read_memory (memaddr, myaddr, len); |
| 134 | |
| 135 | if (result != 0) |
| 136 | result = -result; |
| 137 | return result; |
| 138 | } |
| 139 | |
| 140 | #endif |
| 141 | |
| 142 | /* Define our own link_map structure. |
| 143 | This will help to share code with solib.c. */ |
| 144 | |
| 145 | struct link_map |
| 146 | { |
| 147 | CORE_ADDR l_offset; /* prelink to load address offset */ |
| 148 | char *l_name; /* full name of loaded object */ |
| 149 | ldr_module_info_t module_info; /* corresponding module info */ |
| 150 | }; |
| 151 | |
| 152 | #define LM_OFFSET(so) ((so) -> lm.l_offset) |
| 153 | #define LM_NAME(so) ((so) -> lm.l_name) |
| 154 | |
| 155 | struct so_list |
| 156 | { |
| 157 | struct so_list *next; /* next structure in linked list */ |
| 158 | struct link_map lm; /* copy of link map from inferior */ |
| 159 | struct link_map *lmaddr; /* addr in inferior lm was read from */ |
| 160 | CORE_ADDR lmend; /* upper addr bound of mapped object */ |
| 161 | char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */ |
| 162 | char symbols_loaded; /* flag: symbols read in yet? */ |
| 163 | char from_tty; /* flag: print msgs? */ |
| 164 | struct objfile *objfile; /* objfile for loaded lib */ |
| 165 | struct section_table *sections; |
| 166 | struct section_table *sections_end; |
| 167 | struct section_table *textsection; |
| 168 | bfd *abfd; |
| 169 | }; |
| 170 | |
| 171 | static struct so_list *so_list_head; /* List of known shared objects */ |
| 172 | |
| 173 | extern int fdmatch (int, int); /* In libiberty */ |
| 174 | |
| 175 | /* Local function prototypes */ |
| 176 | |
| 177 | static void sharedlibrary_command (char *, int); |
| 178 | |
| 179 | static void info_sharedlibrary_command (char *, int); |
| 180 | |
| 181 | static int symbol_add_stub (char *); |
| 182 | |
| 183 | static struct so_list *find_solib (struct so_list *); |
| 184 | |
| 185 | static struct link_map *first_link_map_member (void); |
| 186 | |
| 187 | static struct link_map *next_link_map_member (struct so_list *); |
| 188 | |
| 189 | static void xfer_link_map_member (struct so_list *, struct link_map *); |
| 190 | |
| 191 | static int solib_map_sections (char *); |
| 192 | |
| 193 | /* |
| 194 | |
| 195 | LOCAL FUNCTION |
| 196 | |
| 197 | solib_map_sections -- open bfd and build sections for shared lib |
| 198 | |
| 199 | SYNOPSIS |
| 200 | |
| 201 | static int solib_map_sections (struct so_list *so) |
| 202 | |
| 203 | DESCRIPTION |
| 204 | |
| 205 | Given a pointer to one of the shared objects in our list |
| 206 | of mapped objects, use the recorded name to open a bfd |
| 207 | descriptor for the object, build a section table, and then |
| 208 | relocate all the section addresses by the base address at |
| 209 | which the shared object was mapped. |
| 210 | |
| 211 | FIXMES |
| 212 | |
| 213 | In most (all?) cases the shared object file name recorded in the |
| 214 | dynamic linkage tables will be a fully qualified pathname. For |
| 215 | cases where it isn't, do we really mimic the systems search |
| 216 | mechanism correctly in the below code (particularly the tilde |
| 217 | expansion stuff?). |
| 218 | */ |
| 219 | |
| 220 | static int |
| 221 | solib_map_sections (char *arg) |
| 222 | { |
| 223 | struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */ |
| 224 | char *filename; |
| 225 | char *scratch_pathname; |
| 226 | int scratch_chan; |
| 227 | struct section_table *p; |
| 228 | struct cleanup *old_chain; |
| 229 | bfd *abfd; |
| 230 | |
| 231 | filename = tilde_expand (so->so_name); |
| 232 | old_chain = make_cleanup (xfree, filename); |
| 233 | |
| 234 | scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, |
| 235 | &scratch_pathname); |
| 236 | if (scratch_chan < 0) |
| 237 | { |
| 238 | scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, |
| 239 | O_RDONLY, 0, &scratch_pathname); |
| 240 | } |
| 241 | if (scratch_chan < 0) |
| 242 | { |
| 243 | perror_with_name (filename); |
| 244 | } |
| 245 | /* Leave scratch_pathname allocated. bfd->name will point to it. */ |
| 246 | |
| 247 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); |
| 248 | if (!abfd) |
| 249 | { |
| 250 | close (scratch_chan); |
| 251 | error ("Could not open `%s' as an executable file: %s", |
| 252 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
| 253 | } |
| 254 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ |
| 255 | so->abfd = abfd; |
| 256 | abfd->cacheable = true; |
| 257 | |
| 258 | if (!bfd_check_format (abfd, bfd_object)) |
| 259 | { |
| 260 | error ("\"%s\": not in executable format: %s.", |
| 261 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
| 262 | } |
| 263 | if (build_section_table (abfd, &so->sections, &so->sections_end)) |
| 264 | { |
| 265 | error ("Can't find the file sections in `%s': %s", |
| 266 | bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ())); |
| 267 | } |
| 268 | |
| 269 | for (p = so->sections; p < so->sections_end; p++) |
| 270 | { |
| 271 | /* Relocate the section binding addresses as recorded in the shared |
| 272 | object's file by the offset to get the address to which the |
| 273 | object was actually mapped. */ |
| 274 | p->addr += LM_OFFSET (so); |
| 275 | p->endaddr += LM_OFFSET (so); |
| 276 | so->lmend = (CORE_ADDR) max (p->endaddr, so->lmend); |
| 277 | if (STREQ (p->the_bfd_section->name, ".text")) |
| 278 | { |
| 279 | so->textsection = p; |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | /* Free the file names, close the file now. */ |
| 284 | do_cleanups (old_chain); |
| 285 | |
| 286 | return (1); |
| 287 | } |
| 288 | |
| 289 | /* |
| 290 | |
| 291 | LOCAL FUNCTION |
| 292 | |
| 293 | first_link_map_member -- locate first member in dynamic linker's map |
| 294 | |
| 295 | SYNOPSIS |
| 296 | |
| 297 | static struct link_map *first_link_map_member (void) |
| 298 | |
| 299 | DESCRIPTION |
| 300 | |
| 301 | Read in a copy of the first member in the inferior's dynamic |
| 302 | link map from the inferior's dynamic linker structures, and return |
| 303 | a pointer to the copy in our address space. |
| 304 | */ |
| 305 | |
| 306 | static struct link_map * |
| 307 | first_link_map_member (void) |
| 308 | { |
| 309 | struct link_map *lm = NULL; |
| 310 | static struct link_map first_lm; |
| 311 | |
| 312 | #ifdef USE_LDR_ROUTINES |
| 313 | ldr_module_t mod_id = LDR_NULL_MODULE; |
| 314 | size_t retsize; |
| 315 | |
| 316 | fake_ldr_process = ldr_core_process (); |
| 317 | ldr_set_core_reader (ldr_read_memory); |
| 318 | ldr_xdetach (fake_ldr_process); |
| 319 | if (ldr_xattach (fake_ldr_process) != 0 |
| 320 | || ldr_next_module (fake_ldr_process, &mod_id) != 0 |
| 321 | || mod_id == LDR_NULL_MODULE |
| 322 | || ldr_inq_module (fake_ldr_process, mod_id, |
| 323 | &first_lm.module_info, sizeof (ldr_module_info_t), |
| 324 | &retsize) != 0) |
| 325 | return lm; |
| 326 | #else |
| 327 | CORE_ADDR ldr_context_addr; |
| 328 | |
| 329 | if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS, |
| 330 | (char *) &ldr_context_addr, |
| 331 | sizeof (CORE_ADDR)) != 0 |
| 332 | || target_read_memory (ldr_context_addr, |
| 333 | (char *) &ldr_context, |
| 334 | sizeof (ldr_context_t)) != 0 |
| 335 | || target_read_memory ((CORE_ADDR) ldr_context.head, |
| 336 | (char *) &first_lm.module_info, |
| 337 | sizeof (ldr_module_info_t)) != 0) |
| 338 | return lm; |
| 339 | #endif |
| 340 | |
| 341 | lm = &first_lm; |
| 342 | |
| 343 | /* The first entry is for the main program and should be skipped. */ |
| 344 | lm->l_name = NULL; |
| 345 | |
| 346 | return lm; |
| 347 | } |
| 348 | |
| 349 | static struct link_map * |
| 350 | next_link_map_member (struct so_list *so_list_ptr) |
| 351 | { |
| 352 | struct link_map *lm = NULL; |
| 353 | static struct link_map next_lm; |
| 354 | #ifdef USE_LDR_ROUTINES |
| 355 | ldr_module_t mod_id = so_list_ptr->lm.module_info.lmi_modid; |
| 356 | size_t retsize; |
| 357 | |
| 358 | if (ldr_next_module (fake_ldr_process, &mod_id) != 0 |
| 359 | || mod_id == LDR_NULL_MODULE |
| 360 | || ldr_inq_module (fake_ldr_process, mod_id, |
| 361 | &next_lm.module_info, sizeof (ldr_module_info_t), |
| 362 | &retsize) != 0) |
| 363 | return lm; |
| 364 | |
| 365 | lm = &next_lm; |
| 366 | lm->l_name = lm->module_info.lmi_name; |
| 367 | #else |
| 368 | CORE_ADDR ldr_context_addr; |
| 369 | |
| 370 | /* Reread context in case ldr_context.tail was updated. */ |
| 371 | |
| 372 | if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS, |
| 373 | (char *) &ldr_context_addr, |
| 374 | sizeof (CORE_ADDR)) != 0 |
| 375 | || target_read_memory (ldr_context_addr, |
| 376 | (char *) &ldr_context, |
| 377 | sizeof (ldr_context_t)) != 0 |
| 378 | || so_list_ptr->lm.module_info.modinfo_addr == ldr_context.tail |
| 379 | || target_read_memory (so_list_ptr->lm.module_info.next, |
| 380 | (char *) &next_lm.module_info, |
| 381 | sizeof (ldr_module_info_t)) != 0) |
| 382 | return lm; |
| 383 | |
| 384 | lm = &next_lm; |
| 385 | lm->l_name = lm->module_info.module_name; |
| 386 | #endif |
| 387 | return lm; |
| 388 | } |
| 389 | |
| 390 | static void |
| 391 | xfer_link_map_member (struct so_list *so_list_ptr, struct link_map *lm) |
| 392 | { |
| 393 | int i; |
| 394 | so_list_ptr->lm = *lm; |
| 395 | |
| 396 | /* OSF/1 shared libraries are pre-linked to particular addresses, |
| 397 | but the runtime loader may have to relocate them if the |
| 398 | address ranges of the libraries used by the target executable clash, |
| 399 | or if the target executable is linked with the -taso option. |
| 400 | The offset is the difference between the address where the shared |
| 401 | library is mapped and the pre-linked address of the shared library. |
| 402 | |
| 403 | FIXME: GDB is currently unable to relocate the shared library |
| 404 | sections by different offsets. If sections are relocated by |
| 405 | different offsets, put out a warning and use the offset of the |
| 406 | first section for all remaining sections. */ |
| 407 | LM_OFFSET (so_list_ptr) = 0; |
| 408 | |
| 409 | /* There is one entry that has no name (for the inferior executable) |
| 410 | since it is not a shared object. */ |
| 411 | if (LM_NAME (so_list_ptr) != 0) |
| 412 | { |
| 413 | |
| 414 | #ifdef USE_LDR_ROUTINES |
| 415 | int len = strlen (LM_NAME (so_list_ptr) + 1); |
| 416 | |
| 417 | if (len > MAX_PATH_SIZE) |
| 418 | len = MAX_PATH_SIZE; |
| 419 | strncpy (so_list_ptr->so_name, LM_NAME (so_list_ptr), MAX_PATH_SIZE); |
| 420 | so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0'; |
| 421 | |
| 422 | for (i = 0; i < lm->module_info.lmi_nregion; i++) |
| 423 | { |
| 424 | ldr_region_info_t region_info; |
| 425 | size_t retsize; |
| 426 | CORE_ADDR region_offset; |
| 427 | |
| 428 | if (ldr_inq_region (fake_ldr_process, lm->module_info.lmi_modid, |
| 429 | i, ®ion_info, sizeof (region_info), |
| 430 | &retsize) != 0) |
| 431 | break; |
| 432 | region_offset = (CORE_ADDR) region_info.lri_mapaddr |
| 433 | - (CORE_ADDR) region_info.lri_vaddr; |
| 434 | if (i == 0) |
| 435 | LM_OFFSET (so_list_ptr) = region_offset; |
| 436 | else if (LM_OFFSET (so_list_ptr) != region_offset) |
| 437 | warning ("cannot handle shared library relocation for %s (%s)", |
| 438 | so_list_ptr->so_name, region_info.lri_name); |
| 439 | } |
| 440 | #else |
| 441 | int errcode; |
| 442 | char *buffer; |
| 443 | target_read_string ((CORE_ADDR) LM_NAME (so_list_ptr), &buffer, |
| 444 | MAX_PATH_SIZE - 1, &errcode); |
| 445 | if (errcode != 0) |
| 446 | error ("xfer_link_map_member: Can't read pathname for load map: %s\n", |
| 447 | safe_strerror (errcode)); |
| 448 | strncpy (so_list_ptr->so_name, buffer, MAX_PATH_SIZE - 1); |
| 449 | xfree (buffer); |
| 450 | so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0'; |
| 451 | |
| 452 | for (i = 0; i < lm->module_info.region_count; i++) |
| 453 | { |
| 454 | ldr_region_info_t region_info; |
| 455 | CORE_ADDR region_offset; |
| 456 | |
| 457 | if (target_read_memory (lm->module_info.regioninfo_addr |
| 458 | + i * sizeof (region_info), |
| 459 | (char *) ®ion_info, |
| 460 | sizeof (region_info)) != 0) |
| 461 | break; |
| 462 | region_offset = region_info.mapaddr - region_info.vaddr; |
| 463 | if (i == 0) |
| 464 | LM_OFFSET (so_list_ptr) = region_offset; |
| 465 | else if (LM_OFFSET (so_list_ptr) != region_offset) |
| 466 | { |
| 467 | char *region_name; |
| 468 | target_read_string (region_info.regionname_addr, &buffer, |
| 469 | MAX_PATH_SIZE - 1, &errcode); |
| 470 | if (errcode == 0) |
| 471 | region_name = buffer; |
| 472 | else |
| 473 | region_name = "??"; |
| 474 | warning ("cannot handle shared library relocation for %s (%s)", |
| 475 | so_list_ptr->so_name, region_name); |
| 476 | xfree (buffer); |
| 477 | } |
| 478 | } |
| 479 | #endif |
| 480 | |
| 481 | catch_errors (solib_map_sections, (char *) so_list_ptr, |
| 482 | "Error while mapping shared library sections:\n", |
| 483 | RETURN_MASK_ALL); |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | |
| 489 | LOCAL FUNCTION |
| 490 | |
| 491 | find_solib -- step through list of shared objects |
| 492 | |
| 493 | SYNOPSIS |
| 494 | |
| 495 | struct so_list *find_solib (struct so_list *so_list_ptr) |
| 496 | |
| 497 | DESCRIPTION |
| 498 | |
| 499 | This module contains the routine which finds the names of any |
| 500 | loaded "images" in the current process. The argument in must be |
| 501 | NULL on the first call, and then the returned value must be passed |
| 502 | in on subsequent calls. This provides the capability to "step" down |
| 503 | the list of loaded objects. On the last object, a NULL value is |
| 504 | returned. |
| 505 | |
| 506 | The arg and return value are "struct link_map" pointers, as defined |
| 507 | in <link.h>. |
| 508 | */ |
| 509 | |
| 510 | static struct so_list * |
| 511 | find_solib (struct so_list *so_list_ptr) |
| 512 | { |
| 513 | struct so_list *so_list_next = NULL; |
| 514 | struct link_map *lm = NULL; |
| 515 | struct so_list *new; |
| 516 | |
| 517 | if (so_list_ptr == NULL) |
| 518 | { |
| 519 | /* We are setting up for a new scan through the loaded images. */ |
| 520 | if ((so_list_next = so_list_head) == NULL) |
| 521 | { |
| 522 | /* Find the first link map list member. */ |
| 523 | lm = first_link_map_member (); |
| 524 | } |
| 525 | } |
| 526 | else |
| 527 | { |
| 528 | /* We have been called before, and are in the process of walking |
| 529 | the shared library list. Advance to the next shared object. */ |
| 530 | lm = next_link_map_member (so_list_ptr); |
| 531 | so_list_next = so_list_ptr->next; |
| 532 | } |
| 533 | if ((so_list_next == NULL) && (lm != NULL)) |
| 534 | { |
| 535 | /* Get next link map structure from inferior image and build a local |
| 536 | abbreviated load_map structure */ |
| 537 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); |
| 538 | memset ((char *) new, 0, sizeof (struct so_list)); |
| 539 | new->lmaddr = lm; |
| 540 | /* Add the new node as the next node in the list, or as the root |
| 541 | node if this is the first one. */ |
| 542 | if (so_list_ptr != NULL) |
| 543 | { |
| 544 | so_list_ptr->next = new; |
| 545 | } |
| 546 | else |
| 547 | { |
| 548 | so_list_head = new; |
| 549 | } |
| 550 | so_list_next = new; |
| 551 | xfer_link_map_member (new, lm); |
| 552 | } |
| 553 | return (so_list_next); |
| 554 | } |
| 555 | |
| 556 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
| 557 | |
| 558 | static int |
| 559 | symbol_add_stub (char *arg) |
| 560 | { |
| 561 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
| 562 | CORE_ADDR text_addr = 0; |
| 563 | struct section_addr_info section_addrs; |
| 564 | |
| 565 | memset (§ion_addrs, 0, sizeof (section_addrs)); |
| 566 | if (so->textsection) |
| 567 | text_addr = so->textsection->addr; |
| 568 | else if (so->abfd != NULL) |
| 569 | { |
| 570 | asection *lowest_sect; |
| 571 | |
| 572 | /* If we didn't find a mapped non zero sized .text section, set up |
| 573 | text_addr so that the relocation in symbol_file_add does no harm. */ |
| 574 | |
| 575 | lowest_sect = bfd_get_section_by_name (so->abfd, ".text"); |
| 576 | if (lowest_sect == NULL) |
| 577 | bfd_map_over_sections (so->abfd, find_lowest_section, |
| 578 | (PTR) &lowest_sect); |
| 579 | if (lowest_sect) |
| 580 | text_addr = bfd_section_vma (so->abfd, lowest_sect) + LM_OFFSET (so); |
| 581 | } |
| 582 | |
| 583 | section_addrs.other[0].addr = text_addr; |
| 584 | section_addrs.other[0].name = ".text"; |
| 585 | so->objfile = symbol_file_add (so->so_name, so->from_tty, |
| 586 | §ion_addrs, 0, OBJF_SHARED); |
| 587 | return (1); |
| 588 | } |
| 589 | |
| 590 | /* |
| 591 | |
| 592 | GLOBAL FUNCTION |
| 593 | |
| 594 | solib_add -- add a shared library file to the symtab and section list |
| 595 | |
| 596 | SYNOPSIS |
| 597 | |
| 598 | void solib_add (char *arg_string, int from_tty, |
| 599 | struct target_ops *target, int readsyms) |
| 600 | |
| 601 | DESCRIPTION |
| 602 | |
| 603 | */ |
| 604 | |
| 605 | void |
| 606 | solib_add (char *arg_string, int from_tty, struct target_ops *target, int readsyms) |
| 607 | { |
| 608 | register struct so_list *so = NULL; /* link map state variable */ |
| 609 | |
| 610 | /* Last shared library that we read. */ |
| 611 | struct so_list *so_last = NULL; |
| 612 | |
| 613 | char *re_err; |
| 614 | int count; |
| 615 | int old; |
| 616 | |
| 617 | if (!readsyms) |
| 618 | return; |
| 619 | |
| 620 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) |
| 621 | { |
| 622 | error ("Invalid regexp: %s", re_err); |
| 623 | } |
| 624 | |
| 625 | |
| 626 | /* Add the shared library sections to the section table of the |
| 627 | specified target, if any. */ |
| 628 | if (target) |
| 629 | { |
| 630 | /* Count how many new section_table entries there are. */ |
| 631 | so = NULL; |
| 632 | count = 0; |
| 633 | while ((so = find_solib (so)) != NULL) |
| 634 | { |
| 635 | if (so->so_name[0]) |
| 636 | { |
| 637 | count += so->sections_end - so->sections; |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | if (count) |
| 642 | { |
| 643 | /* Add these section table entries to the target's table. */ |
| 644 | |
| 645 | old = target_resize_to_sections (target, count); |
| 646 | |
| 647 | while ((so = find_solib (so)) != NULL) |
| 648 | { |
| 649 | if (so->so_name[0]) |
| 650 | { |
| 651 | count = so->sections_end - so->sections; |
| 652 | memcpy ((char *) (target->to_sections + old), |
| 653 | so->sections, |
| 654 | (sizeof (struct section_table)) * count); |
| 655 | old += count; |
| 656 | } |
| 657 | } |
| 658 | } |
| 659 | } |
| 660 | |
| 661 | /* Now add the symbol files. */ |
| 662 | so = NULL; |
| 663 | while ((so = find_solib (so)) != NULL) |
| 664 | { |
| 665 | if (so->so_name[0] && re_exec (so->so_name)) |
| 666 | { |
| 667 | so->from_tty = from_tty; |
| 668 | if (so->symbols_loaded) |
| 669 | { |
| 670 | if (from_tty) |
| 671 | { |
| 672 | printf_unfiltered ("Symbols already loaded for %s\n", so->so_name); |
| 673 | } |
| 674 | } |
| 675 | else if (catch_errors |
| 676 | (symbol_add_stub, (char *) so, |
| 677 | "Error while reading shared library symbols:\n", |
| 678 | RETURN_MASK_ALL)) |
| 679 | { |
| 680 | so_last = so; |
| 681 | so->symbols_loaded = 1; |
| 682 | } |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | /* Getting new symbols may change our opinion about what is |
| 687 | frameless. */ |
| 688 | if (so_last) |
| 689 | reinit_frame_cache (); |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | |
| 694 | LOCAL FUNCTION |
| 695 | |
| 696 | info_sharedlibrary_command -- code for "info sharedlibrary" |
| 697 | |
| 698 | SYNOPSIS |
| 699 | |
| 700 | static void info_sharedlibrary_command () |
| 701 | |
| 702 | DESCRIPTION |
| 703 | |
| 704 | Walk through the shared library list and print information |
| 705 | about each attached library. |
| 706 | */ |
| 707 | |
| 708 | static void |
| 709 | info_sharedlibrary_command (char *ignore, int from_tty) |
| 710 | { |
| 711 | register struct so_list *so = NULL; /* link map state variable */ |
| 712 | int header_done = 0; |
| 713 | |
| 714 | if (exec_bfd == NULL) |
| 715 | { |
| 716 | printf_unfiltered ("No executable file.\n"); |
| 717 | return; |
| 718 | } |
| 719 | while ((so = find_solib (so)) != NULL) |
| 720 | { |
| 721 | if (so->so_name[0]) |
| 722 | { |
| 723 | unsigned long txt_start = 0; |
| 724 | unsigned long txt_end = 0; |
| 725 | |
| 726 | if (!header_done) |
| 727 | { |
| 728 | printf_unfiltered ("%-20s%-20s%-12s%s\n", "From", "To", "Syms Read", |
| 729 | "Shared Object Library"); |
| 730 | header_done++; |
| 731 | } |
| 732 | if (so->textsection) |
| 733 | { |
| 734 | txt_start = (unsigned long) so->textsection->addr; |
| 735 | txt_end = (unsigned long) so->textsection->endaddr; |
| 736 | } |
| 737 | printf_unfiltered ("%-20s", local_hex_string_custom (txt_start, "08l")); |
| 738 | printf_unfiltered ("%-20s", local_hex_string_custom (txt_end, "08l")); |
| 739 | printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No"); |
| 740 | printf_unfiltered ("%s\n", so->so_name); |
| 741 | } |
| 742 | } |
| 743 | if (so_list_head == NULL) |
| 744 | { |
| 745 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | /* |
| 750 | |
| 751 | GLOBAL FUNCTION |
| 752 | |
| 753 | solib_address -- check to see if an address is in a shared lib |
| 754 | |
| 755 | SYNOPSIS |
| 756 | |
| 757 | char *solib_address (CORE_ADDR address) |
| 758 | |
| 759 | DESCRIPTION |
| 760 | |
| 761 | Provides a hook for other gdb routines to discover whether or |
| 762 | not a particular address is within the mapped address space of |
| 763 | a shared library. Any address between the base mapping address |
| 764 | and the first address beyond the end of the last mapping, is |
| 765 | considered to be within the shared library address space, for |
| 766 | our purposes. |
| 767 | |
| 768 | For example, this routine is called at one point to disable |
| 769 | breakpoints which are in shared libraries that are not currently |
| 770 | mapped in. |
| 771 | */ |
| 772 | |
| 773 | char * |
| 774 | solib_address (CORE_ADDR address) |
| 775 | { |
| 776 | register struct so_list *so = 0; /* link map state variable */ |
| 777 | |
| 778 | while ((so = find_solib (so)) != NULL) |
| 779 | { |
| 780 | if (so->so_name[0] && so->textsection) |
| 781 | { |
| 782 | if ((address >= (CORE_ADDR) so->textsection->addr) && |
| 783 | (address < (CORE_ADDR) so->textsection->endaddr)) |
| 784 | return (so->so_name); |
| 785 | } |
| 786 | } |
| 787 | return (0); |
| 788 | } |
| 789 | |
| 790 | /* Called by free_all_symtabs */ |
| 791 | |
| 792 | void |
| 793 | clear_solib (void) |
| 794 | { |
| 795 | struct so_list *next; |
| 796 | char *bfd_filename; |
| 797 | |
| 798 | disable_breakpoints_in_shlibs (1); |
| 799 | |
| 800 | while (so_list_head) |
| 801 | { |
| 802 | if (so_list_head->sections) |
| 803 | { |
| 804 | xfree (so_list_head->sections); |
| 805 | } |
| 806 | if (so_list_head->abfd) |
| 807 | { |
| 808 | remove_target_sections (so_list_head->abfd); |
| 809 | bfd_filename = bfd_get_filename (so_list_head->abfd); |
| 810 | if (!bfd_close (so_list_head->abfd)) |
| 811 | warning ("cannot close \"%s\": %s", |
| 812 | bfd_filename, bfd_errmsg (bfd_get_error ())); |
| 813 | } |
| 814 | else |
| 815 | /* This happens for the executable on SVR4. */ |
| 816 | bfd_filename = NULL; |
| 817 | |
| 818 | next = so_list_head->next; |
| 819 | if (bfd_filename) |
| 820 | xfree (bfd_filename); |
| 821 | xfree (so_list_head); |
| 822 | so_list_head = next; |
| 823 | } |
| 824 | } |
| 825 | |
| 826 | /* |
| 827 | |
| 828 | GLOBAL FUNCTION |
| 829 | |
| 830 | solib_create_inferior_hook -- shared library startup support |
| 831 | |
| 832 | SYNOPSIS |
| 833 | |
| 834 | void solib_create_inferior_hook() |
| 835 | |
| 836 | DESCRIPTION |
| 837 | |
| 838 | When gdb starts up the inferior, it nurses it along (through the |
| 839 | shell) until it is ready to execute it's first instruction. At this |
| 840 | point, this function gets called via expansion of the macro |
| 841 | SOLIB_CREATE_INFERIOR_HOOK. |
| 842 | For a statically bound executable, this first instruction is the |
| 843 | one at "_start", or a similar text label. No further processing is |
| 844 | needed in that case. |
| 845 | For a dynamically bound executable, this first instruction is somewhere |
| 846 | in the rld, and the actual user executable is not yet mapped in. |
| 847 | We continue the inferior again, rld then maps in the actual user |
| 848 | executable and any needed shared libraries and then sends |
| 849 | itself a SIGTRAP. |
| 850 | At that point we discover the names of all shared libraries and |
| 851 | read their symbols in. |
| 852 | |
| 853 | FIXME |
| 854 | |
| 855 | This code does not properly handle hitting breakpoints which the |
| 856 | user might have set in the rld itself. Proper handling would have |
| 857 | to check if the SIGTRAP happened due to a kill call. |
| 858 | |
| 859 | Also, what if child has exit()ed? Must exit loop somehow. |
| 860 | */ |
| 861 | |
| 862 | void |
| 863 | solib_create_inferior_hook (void) |
| 864 | { |
| 865 | |
| 866 | /* Nothing to do for statically bound executables. */ |
| 867 | |
| 868 | if (symfile_objfile == NULL |
| 869 | || symfile_objfile->obfd == NULL |
| 870 | || ((bfd_get_file_flags (symfile_objfile->obfd) & DYNAMIC) == 0)) |
| 871 | return; |
| 872 | |
| 873 | /* Now run the target. It will eventually get a SIGTRAP, at |
| 874 | which point all of the libraries will have been mapped in and we |
| 875 | can go groveling around in the rld structures to find |
| 876 | out what we need to know about them. */ |
| 877 | |
| 878 | clear_proceed_status (); |
| 879 | stop_soon_quietly = 1; |
| 880 | stop_signal = TARGET_SIGNAL_0; |
| 881 | do |
| 882 | { |
| 883 | target_resume (minus_one_ptid, 0, stop_signal); |
| 884 | wait_for_inferior (); |
| 885 | } |
| 886 | while (stop_signal != TARGET_SIGNAL_TRAP); |
| 887 | |
| 888 | /* solib_add will call reinit_frame_cache. |
| 889 | But we are stopped in the runtime loader and we do not have symbols |
| 890 | for the runtime loader. So heuristic_proc_start will be called |
| 891 | and will put out an annoying warning. |
| 892 | Delaying the resetting of stop_soon_quietly until after symbol loading |
| 893 | suppresses the warning. */ |
| 894 | solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add); |
| 895 | stop_soon_quietly = 0; |
| 896 | } |
| 897 | |
| 898 | |
| 899 | /* |
| 900 | |
| 901 | LOCAL FUNCTION |
| 902 | |
| 903 | sharedlibrary_command -- handle command to explicitly add library |
| 904 | |
| 905 | SYNOPSIS |
| 906 | |
| 907 | static void sharedlibrary_command (char *args, int from_tty) |
| 908 | |
| 909 | DESCRIPTION |
| 910 | |
| 911 | */ |
| 912 | |
| 913 | static void |
| 914 | sharedlibrary_command (char *args, int from_tty) |
| 915 | { |
| 916 | dont_repeat (); |
| 917 | solib_add (args, from_tty, (struct target_ops *) 0, 1); |
| 918 | } |
| 919 | |
| 920 | void |
| 921 | _initialize_solib (void) |
| 922 | { |
| 923 | add_com ("sharedlibrary", class_files, sharedlibrary_command, |
| 924 | "Load shared object library symbols for files matching REGEXP."); |
| 925 | add_info ("sharedlibrary", info_sharedlibrary_command, |
| 926 | "Status of loaded shared object libraries."); |
| 927 | |
| 928 | add_show_from_set |
| 929 | (add_set_cmd ("auto-solib-add", class_support, var_boolean, |
| 930 | (char *) &auto_solib_add, |
| 931 | "Set autoloading of shared library symbols.\n\ |
| 932 | If \"on\", symbols from all shared object libraries will be loaded\n\ |
| 933 | automatically when the inferior begins execution, when the dynamic linker\n\ |
| 934 | informs gdb that a new library has been loaded, or when attaching to the\n\ |
| 935 | inferior. Otherwise, symbols must be loaded manually, using `sharedlibrary'.", |
| 936 | &setlist), |
| 937 | &showlist); |
| 938 | } |