| 1 | /* Handle HP SOM shared libraries for GDB, the GNU Debugger. |
| 2 | Copyright 1993, 1996 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | |
| 20 | Written by the Center for Software Science at the Univerity of Utah |
| 21 | and by Cygnus Support. */ |
| 22 | |
| 23 | |
| 24 | #include "defs.h" |
| 25 | |
| 26 | #include "frame.h" |
| 27 | #include "bfd.h" |
| 28 | #include "som.h" |
| 29 | #include "libhppa.h" |
| 30 | #include "gdbcore.h" |
| 31 | #include "symtab.h" |
| 32 | #include "breakpoint.h" |
| 33 | #include "symfile.h" |
| 34 | #include "objfiles.h" |
| 35 | #include "inferior.h" |
| 36 | #include "gdb-stabs.h" |
| 37 | #include "gdb_stat.h" |
| 38 | #include "gdbcmd.h" |
| 39 | #include "language.h" |
| 40 | |
| 41 | /* TODO: |
| 42 | |
| 43 | * Most of this code should work for hp300 shared libraries. Does |
| 44 | anyone care enough to weed out any SOM-isms. |
| 45 | |
| 46 | * Support for hpux8 dynamic linker. */ |
| 47 | |
| 48 | /* The basic structure which describes a dynamically loaded object. This |
| 49 | data structure is private to the dynamic linker and isn't found in |
| 50 | any HPUX include file. */ |
| 51 | |
| 52 | struct som_solib_mapped_entry |
| 53 | { |
| 54 | /* The name of the library. */ |
| 55 | char *name; |
| 56 | |
| 57 | /* Version of this structure (it is expected to change again in hpux10). */ |
| 58 | unsigned char struct_version; |
| 59 | |
| 60 | /* Binding mode for this library. */ |
| 61 | unsigned char bind_mode; |
| 62 | |
| 63 | /* Version of this library. */ |
| 64 | short library_version; |
| 65 | |
| 66 | /* Start of text address, link-time text location, end of text address. */ |
| 67 | CORE_ADDR text_addr; |
| 68 | CORE_ADDR text_link_addr; |
| 69 | CORE_ADDR text_end; |
| 70 | |
| 71 | /* Start of data, start of bss and end of data. */ |
| 72 | CORE_ADDR data_start; |
| 73 | CORE_ADDR bss_start; |
| 74 | CORE_ADDR data_end; |
| 75 | |
| 76 | /* Value of linkage pointer (%r19). */ |
| 77 | CORE_ADDR got_value; |
| 78 | |
| 79 | /* Next entry. */ |
| 80 | struct som_solib_mapped_entry *next; |
| 81 | |
| 82 | /* There are other fields, but I don't have information as to what is |
| 83 | contained in them. */ |
| 84 | }; |
| 85 | |
| 86 | /* A structure to keep track of all the known shared objects. */ |
| 87 | struct so_list |
| 88 | { |
| 89 | struct som_solib_mapped_entry som_solib; |
| 90 | struct objfile *objfile; |
| 91 | bfd *abfd; |
| 92 | struct section_table *sections; |
| 93 | struct section_table *sections_end; |
| 94 | struct so_list *next; |
| 95 | }; |
| 96 | |
| 97 | static struct so_list *so_list_head; |
| 98 | |
| 99 | static void som_sharedlibrary_info_command PARAMS ((char *, int)); |
| 100 | |
| 101 | static void som_solib_sharedlibrary_command PARAMS ((char *, int)); |
| 102 | |
| 103 | /* Add symbols from shared libraries into the symtab list. */ |
| 104 | |
| 105 | void |
| 106 | som_solib_add (arg_string, from_tty, target) |
| 107 | char *arg_string; |
| 108 | int from_tty; |
| 109 | struct target_ops *target; |
| 110 | { |
| 111 | struct minimal_symbol *msymbol; |
| 112 | struct so_list *so_list_tail; |
| 113 | CORE_ADDR addr; |
| 114 | asection *shlib_info; |
| 115 | int status; |
| 116 | unsigned int dld_flags; |
| 117 | char buf[4], *re_err; |
| 118 | |
| 119 | /* First validate our arguments. */ |
| 120 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) |
| 121 | { |
| 122 | error ("Invalid regexp: %s", re_err); |
| 123 | } |
| 124 | |
| 125 | /* If we're debugging a core file, or have attached to a running |
| 126 | process, then som_solib_create_inferior_hook will not have been |
| 127 | called. |
| 128 | |
| 129 | We need to first determine if we're dealing with a dynamically |
| 130 | linked executable. If not, then return without an error or warning. |
| 131 | |
| 132 | We also need to examine __dld_flags to determine if the shared library |
| 133 | list is valid and to determine if the libraries have been privately |
| 134 | mapped. */ |
| 135 | if (symfile_objfile == NULL) |
| 136 | return; |
| 137 | |
| 138 | /* First see if the objfile was dynamically linked. */ |
| 139 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); |
| 140 | if (!shlib_info) |
| 141 | return; |
| 142 | |
| 143 | /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */ |
| 144 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) |
| 145 | return; |
| 146 | |
| 147 | msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL); |
| 148 | if (msymbol == NULL) |
| 149 | { |
| 150 | error ("Unable to find __dld_flags symbol in object file.\n"); |
| 151 | return; |
| 152 | } |
| 153 | |
| 154 | addr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 155 | /* Read the current contents. */ |
| 156 | status = target_read_memory (addr, buf, 4); |
| 157 | if (status != 0) |
| 158 | { |
| 159 | error ("Unable to read __dld_flags\n"); |
| 160 | return; |
| 161 | } |
| 162 | dld_flags = extract_unsigned_integer (buf, 4); |
| 163 | |
| 164 | /* __dld_list may not be valid. If it's not valid tell the user. */ |
| 165 | if ((dld_flags & 4) == 0) |
| 166 | { |
| 167 | error ("__dld_list is not valid according to __dld_flags.\n"); |
| 168 | return; |
| 169 | } |
| 170 | |
| 171 | /* If the libraries were not mapped private, warn the user. */ |
| 172 | if ((dld_flags & 1) == 0) |
| 173 | warning ("The shared libraries were not privately mapped; setting a\nbreakpoint in a shared library will not work until you rerun the program.\n"); |
| 174 | |
| 175 | msymbol = lookup_minimal_symbol ("__dld_list", NULL, NULL); |
| 176 | if (!msymbol) |
| 177 | { |
| 178 | /* Older crt0.o files (hpux8) don't have __dld_list as a symbol, |
| 179 | but the data is still available if you know where to look. */ |
| 180 | msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL); |
| 181 | if (!msymbol) |
| 182 | { |
| 183 | error ("Unable to find dynamic library list.\n"); |
| 184 | return; |
| 185 | } |
| 186 | addr = SYMBOL_VALUE_ADDRESS (msymbol) - 8; |
| 187 | } |
| 188 | else |
| 189 | addr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 190 | |
| 191 | status = target_read_memory (addr, buf, 4); |
| 192 | if (status != 0) |
| 193 | { |
| 194 | error ("Unable to find dynamic library list.\n"); |
| 195 | return; |
| 196 | } |
| 197 | |
| 198 | addr = extract_unsigned_integer (buf, 4); |
| 199 | |
| 200 | /* If addr is zero, then we're using an old dynamic loader which |
| 201 | doesn't maintain __dld_list. We'll have to use a completely |
| 202 | different approach to get shared library information. */ |
| 203 | if (addr == 0) |
| 204 | goto old_dld; |
| 205 | |
| 206 | /* Using the information in __dld_list is the preferred method |
| 207 | to get at shared library information. It doesn't depend on |
| 208 | any functions in /usr/lib/end.o and has a chance of working |
| 209 | with hpux10 when it is released. */ |
| 210 | status = target_read_memory (addr, buf, 4); |
| 211 | if (status != 0) |
| 212 | { |
| 213 | error ("Unable to find dynamic library list.\n"); |
| 214 | return; |
| 215 | } |
| 216 | |
| 217 | /* addr now holds the address of the first entry in the dynamic |
| 218 | library list. */ |
| 219 | addr = extract_unsigned_integer (buf, 4); |
| 220 | |
| 221 | /* Now that we have a pointer to the dynamic library list, walk |
| 222 | through it and add the symbols for each library. */ |
| 223 | |
| 224 | so_list_tail = so_list_head; |
| 225 | /* Find the end of the list of shared objects. */ |
| 226 | while (so_list_tail && so_list_tail->next) |
| 227 | so_list_tail = so_list_tail->next; |
| 228 | |
| 229 | while (1) |
| 230 | { |
| 231 | CORE_ADDR name_addr, text_addr; |
| 232 | unsigned int name_len; |
| 233 | char *name; |
| 234 | struct so_list *new_so; |
| 235 | struct so_list *so_list = so_list_head; |
| 236 | struct section_table *p; |
| 237 | struct stat statbuf; |
| 238 | |
| 239 | if (addr == 0) |
| 240 | break; |
| 241 | |
| 242 | /* Get a pointer to the name of this library. */ |
| 243 | status = target_read_memory (addr, buf, 4); |
| 244 | if (status != 0) |
| 245 | goto err; |
| 246 | |
| 247 | name_addr = extract_unsigned_integer (buf, 4); |
| 248 | name_len = 0; |
| 249 | while (1) |
| 250 | { |
| 251 | target_read_memory (name_addr + name_len, buf, 1); |
| 252 | if (status != 0) |
| 253 | goto err; |
| 254 | |
| 255 | name_len++; |
| 256 | if (*buf == '\0') |
| 257 | break; |
| 258 | } |
| 259 | name = alloca (name_len); |
| 260 | status = target_read_memory (name_addr, name, name_len); |
| 261 | if (status != 0) |
| 262 | goto err; |
| 263 | |
| 264 | /* See if we've already loaded something with this name. */ |
| 265 | while (so_list) |
| 266 | { |
| 267 | if (!strcmp (so_list->som_solib.name, name)) |
| 268 | break; |
| 269 | so_list = so_list->next; |
| 270 | } |
| 271 | |
| 272 | /* See if the file exists. If not, give a warning, but don't |
| 273 | die. */ |
| 274 | status = stat (name, &statbuf); |
| 275 | if (status == -1) |
| 276 | { |
| 277 | warning ("Can't find file %s referenced in dld_list.", name); |
| 278 | |
| 279 | status = target_read_memory (addr + 36, buf, 4); |
| 280 | if (status != 0) |
| 281 | goto err; |
| 282 | |
| 283 | addr = (CORE_ADDR) extract_unsigned_integer (buf, 4); |
| 284 | continue; |
| 285 | } |
| 286 | |
| 287 | /* If we've already loaded this one or it's the main program, skip it. */ |
| 288 | if (so_list || !strcmp (name, symfile_objfile->name)) |
| 289 | { |
| 290 | status = target_read_memory (addr + 36, buf, 4); |
| 291 | if (status != 0) |
| 292 | goto err; |
| 293 | |
| 294 | addr = (CORE_ADDR) extract_unsigned_integer (buf, 4); |
| 295 | continue; |
| 296 | } |
| 297 | |
| 298 | name = obsavestring (name, name_len - 1, |
| 299 | &symfile_objfile->symbol_obstack); |
| 300 | |
| 301 | status = target_read_memory (addr + 8, buf, 4); |
| 302 | if (status != 0) |
| 303 | goto err; |
| 304 | |
| 305 | text_addr = extract_unsigned_integer (buf, 4); |
| 306 | |
| 307 | |
| 308 | new_so = (struct so_list *) xmalloc (sizeof (struct so_list)); |
| 309 | memset ((char *)new_so, 0, sizeof (struct so_list)); |
| 310 | if (so_list_head == NULL) |
| 311 | { |
| 312 | so_list_head = new_so; |
| 313 | so_list_tail = new_so; |
| 314 | } |
| 315 | else |
| 316 | { |
| 317 | so_list_tail->next = new_so; |
| 318 | so_list_tail = new_so; |
| 319 | } |
| 320 | |
| 321 | /* Fill in all the entries in GDB's shared library list. */ |
| 322 | new_so->som_solib.name = name; |
| 323 | status = target_read_memory (addr + 4, buf, 4); |
| 324 | if (status != 0) |
| 325 | goto err; |
| 326 | |
| 327 | new_so->som_solib.struct_version = extract_unsigned_integer (buf + 3, 1); |
| 328 | new_so->som_solib.bind_mode = extract_unsigned_integer (buf + 2, 1); |
| 329 | new_so->som_solib.library_version = extract_unsigned_integer (buf, 2); |
| 330 | new_so->som_solib.text_addr = text_addr; |
| 331 | |
| 332 | status = target_read_memory (addr + 12, buf, 4); |
| 333 | if (status != 0) |
| 334 | goto err; |
| 335 | |
| 336 | new_so->som_solib.text_link_addr = extract_unsigned_integer (buf, 4); |
| 337 | |
| 338 | status = target_read_memory (addr + 16, buf, 4); |
| 339 | if (status != 0) |
| 340 | goto err; |
| 341 | |
| 342 | new_so->som_solib.text_end = extract_unsigned_integer (buf, 4); |
| 343 | |
| 344 | status = target_read_memory (addr + 20, buf, 4); |
| 345 | if (status != 0) |
| 346 | goto err; |
| 347 | |
| 348 | new_so->som_solib.data_start = extract_unsigned_integer (buf, 4); |
| 349 | |
| 350 | status = target_read_memory (addr + 24, buf, 4); |
| 351 | if (status != 0) |
| 352 | goto err; |
| 353 | |
| 354 | new_so->som_solib.bss_start = extract_unsigned_integer (buf, 4); |
| 355 | |
| 356 | status = target_read_memory (addr + 28, buf, 4); |
| 357 | if (status != 0) |
| 358 | goto err; |
| 359 | |
| 360 | new_so->som_solib.data_end = extract_unsigned_integer (buf, 4); |
| 361 | |
| 362 | status = target_read_memory (addr + 32, buf, 4); |
| 363 | if (status != 0) |
| 364 | goto err; |
| 365 | |
| 366 | new_so->som_solib.got_value = extract_unsigned_integer (buf, 4); |
| 367 | |
| 368 | status = target_read_memory (addr + 36, buf, 4); |
| 369 | if (status != 0) |
| 370 | goto err; |
| 371 | |
| 372 | new_so->som_solib.next = (void *)extract_unsigned_integer (buf, 4); |
| 373 | addr = (CORE_ADDR)new_so->som_solib.next; |
| 374 | |
| 375 | new_so->objfile = symbol_file_add (name, from_tty, text_addr, 0, 0, 0); |
| 376 | new_so->abfd = new_so->objfile->obfd; |
| 377 | |
| 378 | if (!bfd_check_format (new_so->abfd, bfd_object)) |
| 379 | { |
| 380 | error ("\"%s\": not in executable format: %s.", |
| 381 | name, bfd_errmsg (bfd_get_error ())); |
| 382 | } |
| 383 | |
| 384 | /* Now we need to build a section table for this library since |
| 385 | we might be debugging a core file from a dynamically linked |
| 386 | executable in which the libraries were not privately mapped. */ |
| 387 | if (build_section_table (new_so->abfd, |
| 388 | &new_so->sections, |
| 389 | &new_so->sections_end)) |
| 390 | { |
| 391 | error ("Unable to build section table for shared library\n."); |
| 392 | return; |
| 393 | } |
| 394 | |
| 395 | /* Relocate all the sections based on where they got loaded. */ |
| 396 | for (p = new_so->sections; p < new_so->sections_end; p++) |
| 397 | { |
| 398 | if (p->the_bfd_section->flags & SEC_CODE) |
| 399 | { |
| 400 | p->addr += text_addr - new_so->som_solib.text_link_addr; |
| 401 | p->endaddr += text_addr - new_so->som_solib.text_link_addr; |
| 402 | } |
| 403 | else if (p->the_bfd_section->flags & SEC_DATA) |
| 404 | { |
| 405 | p->addr += new_so->som_solib.data_start; |
| 406 | p->endaddr += new_so->som_solib.data_start; |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | /* Now see if we need to map in the text and data for this shared |
| 411 | library (for example debugging a core file which does not use |
| 412 | private shared libraries.). |
| 413 | |
| 414 | Carefully peek at the first text address in the library. If the |
| 415 | read succeeds, then the libraries were privately mapped and were |
| 416 | included in the core dump file. |
| 417 | |
| 418 | If the peek failed, then the libraries were not privately mapped |
| 419 | and are not in the core file, we'll have to read them in ourselves. */ |
| 420 | status = target_read_memory (text_addr, buf, 4); |
| 421 | if (status != 0) |
| 422 | { |
| 423 | int old, new; |
| 424 | int update_coreops; |
| 425 | |
| 426 | /* We must update the to_sections field in the core_ops structure |
| 427 | here, otherwise we dereference a potential dangling pointer |
| 428 | for each call to target_read/write_memory within this routine. */ |
| 429 | update_coreops = core_ops.to_sections == target->to_sections; |
| 430 | |
| 431 | new = new_so->sections_end - new_so->sections; |
| 432 | /* Add sections from the shared library to the core target. */ |
| 433 | if (target->to_sections) |
| 434 | { |
| 435 | old = target->to_sections_end - target->to_sections; |
| 436 | target->to_sections = (struct section_table *) |
| 437 | xrealloc ((char *)target->to_sections, |
| 438 | ((sizeof (struct section_table)) * (old + new))); |
| 439 | } |
| 440 | else |
| 441 | { |
| 442 | old = 0; |
| 443 | target->to_sections = (struct section_table *) |
| 444 | xmalloc ((sizeof (struct section_table)) * new); |
| 445 | } |
| 446 | target->to_sections_end = (target->to_sections + old + new); |
| 447 | |
| 448 | /* Update the to_sections field in the core_ops structure |
| 449 | if needed. */ |
| 450 | if (update_coreops) |
| 451 | { |
| 452 | core_ops.to_sections = target->to_sections; |
| 453 | core_ops.to_sections_end = target->to_sections_end; |
| 454 | } |
| 455 | |
| 456 | /* Copy over the old data before it gets clobbered. */ |
| 457 | memcpy ((char *)(target->to_sections + old), |
| 458 | new_so->sections, |
| 459 | ((sizeof (struct section_table)) * new)); |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | /* Getting new symbols may change our opinion about what is |
| 464 | frameless. */ |
| 465 | reinit_frame_cache (); |
| 466 | return; |
| 467 | |
| 468 | old_dld: |
| 469 | error ("Debugging dynamic executables loaded via the hpux8 dld.sl is not supported.\n"); |
| 470 | return; |
| 471 | |
| 472 | err: |
| 473 | error ("Error while reading dynamic library list.\n"); |
| 474 | return; |
| 475 | } |
| 476 | |
| 477 | |
| 478 | /* This hook gets called just before the first instruction in the |
| 479 | inferior process is executed. |
| 480 | |
| 481 | This is our opportunity to set magic flags in the inferior so |
| 482 | that GDB can be notified when a shared library is mapped in and |
| 483 | to tell the dynamic linker that a private copy of the library is |
| 484 | needed (so GDB can set breakpoints in the library). |
| 485 | |
| 486 | __dld_flags is the location of the magic flags; as of this implementation |
| 487 | there are 3 flags of interest: |
| 488 | |
| 489 | bit 0 when set indicates that private copies of the libraries are needed |
| 490 | bit 1 when set indicates that the callback hook routine is valid |
| 491 | bit 2 when set indicates that the dynamic linker should maintain the |
| 492 | __dld_list structure when loading/unloading libraries. |
| 493 | |
| 494 | Note that shared libraries are not mapped in at this time, so we have |
| 495 | run the inferior until the libraries are mapped in. Typically this |
| 496 | means running until the "_start" is called. */ |
| 497 | |
| 498 | void |
| 499 | som_solib_create_inferior_hook() |
| 500 | { |
| 501 | struct minimal_symbol *msymbol; |
| 502 | unsigned int dld_flags, status, have_endo; |
| 503 | asection *shlib_info; |
| 504 | char buf[4]; |
| 505 | struct objfile *objfile; |
| 506 | CORE_ADDR anaddr; |
| 507 | |
| 508 | /* First, remove all the solib event breakpoints. Their addresses |
| 509 | may have changed since the last time we ran the program. */ |
| 510 | remove_solib_event_breakpoints (); |
| 511 | |
| 512 | if (symfile_objfile == NULL) |
| 513 | return; |
| 514 | |
| 515 | /* First see if the objfile was dynamically linked. */ |
| 516 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); |
| 517 | if (!shlib_info) |
| 518 | return; |
| 519 | |
| 520 | /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */ |
| 521 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) |
| 522 | return; |
| 523 | |
| 524 | have_endo = 0; |
| 525 | /* If __d_pid is present, then put the inferior's pid into __d_pid. hpux9 |
| 526 | requires __d_pid to be set. hpux10 doesn't require __d_pid to be set |
| 527 | and the symbol may not be available. |
| 528 | |
| 529 | Never warn about __d_pid. */ |
| 530 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); |
| 531 | if (msymbol != NULL) |
| 532 | { |
| 533 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 534 | store_unsigned_integer (buf, 4, inferior_pid); |
| 535 | status = target_write_memory (anaddr, buf, 4); |
| 536 | if (status != 0) |
| 537 | { |
| 538 | warning ("Unable to write __d_pid"); |
| 539 | goto keep_going; |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | /* If __d_trap_fptr exists, then load whatever's at that address |
| 544 | and put it into __dld_hook. */ |
| 545 | msymbol = lookup_minimal_symbol ("__d_trap_fptr", NULL, symfile_objfile); |
| 546 | if (msymbol != NULL) |
| 547 | { |
| 548 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 549 | status = target_read_memory (anaddr, buf, 4); |
| 550 | anaddr = extract_unsigned_integer (buf, 4); |
| 551 | |
| 552 | /* If it's a plabel, then get the address of the real function. |
| 553 | Egad. This is just the opposite of how hpux9 and _DLD_HOOK |
| 554 | works. */ |
| 555 | if (anaddr | 0x2) |
| 556 | { |
| 557 | status = target_read_memory (anaddr & ~0x2, buf, 4); |
| 558 | anaddr = extract_unsigned_integer (buf, 4); |
| 559 | } |
| 560 | } |
| 561 | else |
| 562 | { |
| 563 | /* Get the value of _DLD_HOOK (an export stub) and put it in __dld_hook; |
| 564 | This will force the dynamic linker to call __d_trap when significant |
| 565 | events occur. */ |
| 566 | msymbol = lookup_minimal_symbol ("_DLD_HOOK", NULL, symfile_objfile); |
| 567 | if (msymbol == NULL) |
| 568 | { |
| 569 | warning ("Unable to find _DLD_HOOK symbol in object file."); |
| 570 | warning ("Suggest linking with /usr/lib/end.o."); |
| 571 | warning ("GDB will be unable to track shl_load/shl_unload calls"); |
| 572 | goto keep_going; |
| 573 | } |
| 574 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 575 | |
| 576 | /* Grrr, this might not be an export symbol! We have to find the |
| 577 | export stub. */ |
| 578 | ALL_OBJFILES (objfile) |
| 579 | { |
| 580 | extern struct unwind_table_entry *find_unwind_entry PARAMS ((CORE_ADDR pc)); |
| 581 | |
| 582 | /* What a crock. */ |
| 583 | msymbol |
| 584 | = lookup_minimal_symbol_solib_trampoline (SYMBOL_NAME (msymbol), |
| 585 | NULL, objfile); |
| 586 | /* Found a symbol with the right name. */ |
| 587 | if (msymbol) |
| 588 | { |
| 589 | struct unwind_table_entry *u; |
| 590 | /* It must be a shared library trampoline. */ |
| 591 | if (MSYMBOL_TYPE (msymbol) != mst_solib_trampoline) |
| 592 | continue; |
| 593 | |
| 594 | /* It must also be an export stub. */ |
| 595 | u = find_unwind_entry (SYMBOL_VALUE (msymbol)); |
| 596 | if (!u || u->stub_type != EXPORT) |
| 597 | continue; |
| 598 | |
| 599 | /* OK. Looks like the correct import stub. */ |
| 600 | anaddr = SYMBOL_VALUE (msymbol); |
| 601 | break; |
| 602 | } |
| 603 | } |
| 604 | } |
| 605 | store_unsigned_integer (buf, 4, anaddr); |
| 606 | |
| 607 | msymbol = lookup_minimal_symbol ("__dld_hook", NULL, symfile_objfile); |
| 608 | if (msymbol == NULL) |
| 609 | { |
| 610 | warning ("Unable to find __dld_hook symbol in object file."); |
| 611 | warning ("Suggest linking with /usr/lib/end.o."); |
| 612 | warning ("GDB will be unable to track shl_load/shl_unload calls"); |
| 613 | goto keep_going; |
| 614 | } |
| 615 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 616 | status = target_write_memory (anaddr, buf, 4); |
| 617 | |
| 618 | /* Now set a shlib_event breakpoint at __d_trap so we can track |
| 619 | significant shared library events. */ |
| 620 | msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile); |
| 621 | if (msymbol == NULL) |
| 622 | { |
| 623 | warning ("Unable to find __dld_d_trap symbol in object file."); |
| 624 | warning ("Suggest linking with /usr/lib/end.o."); |
| 625 | warning ("GDB will be unable to track shl_load/shl_unload calls"); |
| 626 | goto keep_going; |
| 627 | } |
| 628 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); |
| 629 | |
| 630 | /* We have all the support usually found in end.o, so we can track |
| 631 | shl_load and shl_unload calls. */ |
| 632 | have_endo = 1; |
| 633 | |
| 634 | keep_going: |
| 635 | |
| 636 | /* Get the address of __dld_flags, if no such symbol exists, then we can |
| 637 | not debug the shared code. */ |
| 638 | msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL); |
| 639 | if (msymbol == NULL) |
| 640 | { |
| 641 | error ("Unable to find __dld_flags symbol in object file.\n"); |
| 642 | goto keep_going; |
| 643 | return; |
| 644 | } |
| 645 | |
| 646 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 647 | /* Read the current contents. */ |
| 648 | status = target_read_memory (anaddr, buf, 4); |
| 649 | if (status != 0) |
| 650 | { |
| 651 | error ("Unable to read __dld_flags\n"); |
| 652 | return; |
| 653 | } |
| 654 | dld_flags = extract_unsigned_integer (buf, 4); |
| 655 | |
| 656 | /* Turn on the flags we care about. */ |
| 657 | dld_flags |= (0x5 | (have_endo << 1)); |
| 658 | store_unsigned_integer (buf, 4, dld_flags); |
| 659 | status = target_write_memory (anaddr, buf, 4); |
| 660 | if (status != 0) |
| 661 | { |
| 662 | error ("Unable to write __dld_flags\n"); |
| 663 | return; |
| 664 | } |
| 665 | |
| 666 | /* Now find the address of _start and set a breakpoint there. |
| 667 | We still need this code for two reasons: |
| 668 | |
| 669 | * Not all sites have /usr/lib/end.o, so it's not always |
| 670 | possible to track the dynamic linker's events. |
| 671 | |
| 672 | * At this time no events are triggered for shared libraries |
| 673 | loaded at startup time (what a crock). */ |
| 674 | |
| 675 | msymbol = lookup_minimal_symbol ("_start", NULL, symfile_objfile); |
| 676 | if (msymbol == NULL) |
| 677 | { |
| 678 | error ("Unable to find _start symbol in object file.\n"); |
| 679 | return; |
| 680 | } |
| 681 | |
| 682 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 683 | |
| 684 | /* Make the breakpoint at "_start" a shared library event breakpoint. */ |
| 685 | create_solib_event_breakpoint (anaddr); |
| 686 | |
| 687 | /* Wipe out all knowledge of old shared libraries since their |
| 688 | mapping can change from one exec to another! */ |
| 689 | while (so_list_head) |
| 690 | { |
| 691 | struct so_list *temp; |
| 692 | |
| 693 | free_objfile (so_list_head->objfile); |
| 694 | temp = so_list_head; |
| 695 | free (so_list_head); |
| 696 | so_list_head = temp->next; |
| 697 | } |
| 698 | clear_symtab_users (); |
| 699 | } |
| 700 | |
| 701 | /* Return the GOT value for the shared library in which ADDR belongs. If |
| 702 | ADDR isn't in any known shared library, return zero. */ |
| 703 | |
| 704 | CORE_ADDR |
| 705 | som_solib_get_got_by_pc (addr) |
| 706 | CORE_ADDR addr; |
| 707 | { |
| 708 | struct so_list *so_list = so_list_head; |
| 709 | CORE_ADDR got_value = 0; |
| 710 | |
| 711 | while (so_list) |
| 712 | { |
| 713 | if (so_list->som_solib.text_addr <= addr |
| 714 | && so_list->som_solib.text_end > addr) |
| 715 | { |
| 716 | got_value = so_list->som_solib.got_value; |
| 717 | break; |
| 718 | } |
| 719 | so_list = so_list->next; |
| 720 | } |
| 721 | return got_value; |
| 722 | } |
| 723 | |
| 724 | int |
| 725 | som_solib_section_offsets (objfile, offsets) |
| 726 | struct objfile *objfile; |
| 727 | struct section_offsets *offsets; |
| 728 | { |
| 729 | struct so_list *so_list = so_list_head; |
| 730 | |
| 731 | while (so_list) |
| 732 | { |
| 733 | /* Oh what a pain! We need the offsets before so_list->objfile |
| 734 | is valid. The BFDs will never match. Make a best guess. */ |
| 735 | if (strstr (objfile->name, so_list->som_solib.name)) |
| 736 | { |
| 737 | asection *private_section; |
| 738 | |
| 739 | /* The text offset is easy. */ |
| 740 | ANOFFSET (offsets, SECT_OFF_TEXT) |
| 741 | = (so_list->som_solib.text_addr |
| 742 | - so_list->som_solib.text_link_addr); |
| 743 | ANOFFSET (offsets, SECT_OFF_RODATA) |
| 744 | = ANOFFSET (offsets, SECT_OFF_TEXT); |
| 745 | |
| 746 | /* We should look at presumed_dp in the SOM header, but |
| 747 | that's not easily available. This should be OK though. */ |
| 748 | private_section = bfd_get_section_by_name (objfile->obfd, |
| 749 | "$PRIVATE$"); |
| 750 | if (!private_section) |
| 751 | { |
| 752 | warning ("Unable to find $PRIVATE$ in shared library!"); |
| 753 | ANOFFSET (offsets, SECT_OFF_DATA) = 0; |
| 754 | ANOFFSET (offsets, SECT_OFF_BSS) = 0; |
| 755 | return 1; |
| 756 | } |
| 757 | ANOFFSET (offsets, SECT_OFF_DATA) |
| 758 | = (so_list->som_solib.data_start - private_section->vma); |
| 759 | ANOFFSET (offsets, SECT_OFF_BSS) |
| 760 | = ANOFFSET (offsets, SECT_OFF_DATA); |
| 761 | return 1; |
| 762 | } |
| 763 | so_list = so_list->next; |
| 764 | } |
| 765 | return 0; |
| 766 | } |
| 767 | |
| 768 | /* Dump information about all the currently loaded shared libraries. */ |
| 769 | |
| 770 | static void |
| 771 | som_sharedlibrary_info_command (ignore, from_tty) |
| 772 | char *ignore; |
| 773 | int from_tty; |
| 774 | { |
| 775 | struct so_list *so_list = so_list_head; |
| 776 | |
| 777 | if (exec_bfd == NULL) |
| 778 | { |
| 779 | printf_unfiltered ("no exec file.\n"); |
| 780 | return; |
| 781 | } |
| 782 | |
| 783 | if (so_list == NULL) |
| 784 | { |
| 785 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
| 786 | return; |
| 787 | } |
| 788 | |
| 789 | printf_unfiltered ("Shared Object Libraries\n"); |
| 790 | printf_unfiltered (" %-12s%-12s%-12s%-12s%-12s%-12s\n", |
| 791 | " flags", " tstart", " tend", " dstart", " dend", " dlt"); |
| 792 | while (so_list) |
| 793 | { |
| 794 | unsigned int flags; |
| 795 | |
| 796 | flags = so_list->som_solib.struct_version << 24; |
| 797 | flags |= so_list->som_solib.bind_mode << 16; |
| 798 | flags |= so_list->som_solib.library_version; |
| 799 | printf_unfiltered ("%s\n", so_list->som_solib.name); |
| 800 | printf_unfiltered (" %-12s", local_hex_string_custom (flags, "08l")); |
| 801 | printf_unfiltered ("%-12s", |
| 802 | local_hex_string_custom (so_list->som_solib.text_addr, "08l")); |
| 803 | printf_unfiltered ("%-12s", |
| 804 | local_hex_string_custom (so_list->som_solib.text_end, "08l")); |
| 805 | printf_unfiltered ("%-12s", |
| 806 | local_hex_string_custom (so_list->som_solib.data_start, "08l")); |
| 807 | printf_unfiltered ("%-12s", |
| 808 | local_hex_string_custom (so_list->som_solib.data_end, "08l")); |
| 809 | printf_unfiltered ("%-12s\n", |
| 810 | local_hex_string_custom (so_list->som_solib.got_value, "08l")); |
| 811 | so_list = so_list->next; |
| 812 | } |
| 813 | } |
| 814 | |
| 815 | static void |
| 816 | som_solib_sharedlibrary_command (args, from_tty) |
| 817 | char *args; |
| 818 | int from_tty; |
| 819 | { |
| 820 | dont_repeat (); |
| 821 | som_solib_add (args, from_tty, (struct target_ops *) 0); |
| 822 | } |
| 823 | |
| 824 | void |
| 825 | _initialize_som_solib () |
| 826 | { |
| 827 | add_com ("sharedlibrary", class_files, som_solib_sharedlibrary_command, |
| 828 | "Load shared object library symbols for files matching REGEXP."); |
| 829 | add_info ("sharedlibrary", som_sharedlibrary_info_command, |
| 830 | "Status of loaded shared object libraries."); |
| 831 | add_show_from_set |
| 832 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, |
| 833 | (char *) &auto_solib_add, |
| 834 | "Set autoloading of shared library symbols at startup.\n\ |
| 835 | If nonzero, symbols from all shared object libraries will be loaded\n\ |
| 836 | automatically when the inferior begins execution or when the dynamic linker\n\ |
| 837 | informs gdb that a new library has been loaded. Otherwise, symbols\n\ |
| 838 | must be loaded manually, using `sharedlibrary'.", |
| 839 | &setlist), |
| 840 | &showlist); |
| 841 | |
| 842 | } |