| 1 | /* Handle PA64 shared libraries for GDB, the GNU Debugger. |
| 2 | |
| 3 | Copyright (C) 2004, 2007 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 | HP in their infinite stupidity choose not to use standard ELF dynamic |
| 21 | linker interfaces. They also choose not to make their ELF dymamic |
| 22 | linker interfaces compatible with the SOM dynamic linker. The |
| 23 | net result is we can not use either of the existing somsolib.c or |
| 24 | solib.c. What a crock. |
| 25 | |
| 26 | Even more disgusting. This file depends on functions provided only |
| 27 | in certain PA64 libraries. Thus this file is supposed to only be |
| 28 | used native. When will HP ever learn that they need to provide the |
| 29 | same functionality in all their libraries! */ |
| 30 | |
| 31 | #include "defs.h" |
| 32 | #include "symtab.h" |
| 33 | #include "bfd.h" |
| 34 | #include "symfile.h" |
| 35 | #include "objfiles.h" |
| 36 | #include "gdbcore.h" |
| 37 | #include "target.h" |
| 38 | #include "inferior.h" |
| 39 | |
| 40 | #include "hppa-tdep.h" |
| 41 | #include "solist.h" |
| 42 | #include "solib.h" |
| 43 | #include "solib-pa64.h" |
| 44 | |
| 45 | #undef SOLIB_PA64_DBG |
| 46 | |
| 47 | /* We can build this file only when running natively on 64-bit HP/UX. |
| 48 | We check for that by checking for the elf_hp.h header file. */ |
| 49 | #ifdef HAVE_ELF_HP_H |
| 50 | |
| 51 | /* FIXME: kettenis/20041213: These includes should be eliminated. */ |
| 52 | #include <dlfcn.h> |
| 53 | #include <elf.h> |
| 54 | #include <elf_hp.h> |
| 55 | |
| 56 | struct lm_info { |
| 57 | struct load_module_desc desc; |
| 58 | CORE_ADDR desc_addr; |
| 59 | }; |
| 60 | |
| 61 | /* When adding fields, be sure to clear them in _initialize_pa64_solib. */ |
| 62 | typedef struct |
| 63 | { |
| 64 | CORE_ADDR dld_flags_addr; |
| 65 | LONGEST dld_flags; |
| 66 | struct bfd_section *dyninfo_sect; |
| 67 | int have_read_dld_descriptor; |
| 68 | int is_valid; |
| 69 | CORE_ADDR load_map; |
| 70 | CORE_ADDR load_map_addr; |
| 71 | struct load_module_desc dld_desc; |
| 72 | } |
| 73 | dld_cache_t; |
| 74 | |
| 75 | static dld_cache_t dld_cache; |
| 76 | |
| 77 | static int |
| 78 | read_dynamic_info (asection *dyninfo_sect, dld_cache_t *dld_cache_p); |
| 79 | |
| 80 | static void |
| 81 | pa64_relocate_section_addresses (struct so_list *so, |
| 82 | struct section_table *sec) |
| 83 | { |
| 84 | asection *asec = sec->the_bfd_section; |
| 85 | CORE_ADDR load_offset; |
| 86 | |
| 87 | /* Relocate all the sections based on where they got loaded. */ |
| 88 | |
| 89 | load_offset = bfd_section_vma (so->abfd, asec) - asec->filepos; |
| 90 | |
| 91 | if (asec->flags & SEC_CODE) |
| 92 | { |
| 93 | sec->addr += so->lm_info->desc.text_base - load_offset; |
| 94 | sec->endaddr += so->lm_info->desc.text_base - load_offset; |
| 95 | } |
| 96 | else if (asec->flags & SEC_DATA) |
| 97 | { |
| 98 | sec->addr += so->lm_info->desc.data_base - load_offset; |
| 99 | sec->endaddr += so->lm_info->desc.data_base - load_offset; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | static void |
| 104 | pa64_free_so (struct so_list *so) |
| 105 | { |
| 106 | xfree (so->lm_info); |
| 107 | } |
| 108 | |
| 109 | static void |
| 110 | pa64_clear_solib (void) |
| 111 | { |
| 112 | } |
| 113 | |
| 114 | /* Wrapper for target_read_memory for dlgetmodinfo. */ |
| 115 | |
| 116 | static void * |
| 117 | pa64_target_read_memory (void *buffer, CORE_ADDR ptr, size_t bufsiz, int ident) |
| 118 | { |
| 119 | if (target_read_memory (ptr, buffer, bufsiz) != 0) |
| 120 | return 0; |
| 121 | return buffer; |
| 122 | } |
| 123 | |
| 124 | /* Read the dynamic linker's internal shared library descriptor. |
| 125 | |
| 126 | This must happen after dld starts running, so we can't do it in |
| 127 | read_dynamic_info. Record the fact that we have loaded the |
| 128 | descriptor. If the library is archive bound, then return zero, else |
| 129 | return nonzero. */ |
| 130 | |
| 131 | static int |
| 132 | read_dld_descriptor (void) |
| 133 | { |
| 134 | char *dll_path; |
| 135 | asection *dyninfo_sect; |
| 136 | |
| 137 | /* If necessary call read_dynamic_info to extract the contents of the |
| 138 | .dynamic section from the shared library. */ |
| 139 | if (!dld_cache.is_valid) |
| 140 | { |
| 141 | if (symfile_objfile == NULL) |
| 142 | error (_("No object file symbols.")); |
| 143 | |
| 144 | dyninfo_sect = bfd_get_section_by_name (symfile_objfile->obfd, |
| 145 | ".dynamic"); |
| 146 | if (!dyninfo_sect) |
| 147 | { |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | if (!read_dynamic_info (dyninfo_sect, &dld_cache)) |
| 152 | error (_("Unable to read in .dynamic section information.")); |
| 153 | } |
| 154 | |
| 155 | /* Read the load map pointer. */ |
| 156 | if (target_read_memory (dld_cache.load_map_addr, |
| 157 | (char *) &dld_cache.load_map, |
| 158 | sizeof (dld_cache.load_map)) |
| 159 | != 0) |
| 160 | { |
| 161 | error (_("Error while reading in load map pointer.")); |
| 162 | } |
| 163 | |
| 164 | /* Read in the dld load module descriptor */ |
| 165 | if (dlgetmodinfo (-1, |
| 166 | &dld_cache.dld_desc, |
| 167 | sizeof (dld_cache.dld_desc), |
| 168 | pa64_target_read_memory, |
| 169 | 0, |
| 170 | dld_cache.load_map) |
| 171 | == 0) |
| 172 | { |
| 173 | error (_("Error trying to get information about dynamic linker.")); |
| 174 | } |
| 175 | |
| 176 | /* Indicate that we have loaded the dld descriptor. */ |
| 177 | dld_cache.have_read_dld_descriptor = 1; |
| 178 | |
| 179 | return 1; |
| 180 | } |
| 181 | |
| 182 | |
| 183 | /* Read the .dynamic section and extract the information of interest, |
| 184 | which is stored in dld_cache. The routine elf_locate_base in solib.c |
| 185 | was used as a model for this. */ |
| 186 | |
| 187 | static int |
| 188 | read_dynamic_info (asection *dyninfo_sect, dld_cache_t *dld_cache_p) |
| 189 | { |
| 190 | char *buf; |
| 191 | char *bufend; |
| 192 | CORE_ADDR dyninfo_addr; |
| 193 | int dyninfo_sect_size; |
| 194 | CORE_ADDR entry_addr; |
| 195 | |
| 196 | /* Read in .dynamic section, silently ignore errors. */ |
| 197 | dyninfo_addr = bfd_section_vma (symfile_objfile->obfd, dyninfo_sect); |
| 198 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); |
| 199 | buf = alloca (dyninfo_sect_size); |
| 200 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) |
| 201 | return 0; |
| 202 | |
| 203 | /* Scan the .dynamic section and record the items of interest. |
| 204 | In particular, DT_HP_DLD_FLAGS */ |
| 205 | for (bufend = buf + dyninfo_sect_size, entry_addr = dyninfo_addr; |
| 206 | buf < bufend; |
| 207 | buf += sizeof (Elf64_Dyn), entry_addr += sizeof (Elf64_Dyn)) |
| 208 | { |
| 209 | Elf64_Dyn *x_dynp = (Elf64_Dyn*)buf; |
| 210 | Elf64_Sxword dyn_tag; |
| 211 | CORE_ADDR dyn_ptr; |
| 212 | char *pbuf; |
| 213 | |
| 214 | pbuf = alloca (gdbarch_ptr_bit (current_gdbarch) / HOST_CHAR_BIT); |
| 215 | dyn_tag = bfd_h_get_64 (symfile_objfile->obfd, |
| 216 | (bfd_byte*) &x_dynp->d_tag); |
| 217 | |
| 218 | /* We can't use a switch here because dyn_tag is 64 bits and HP's |
| 219 | lame comiler does not handle 64bit items in switch statements. */ |
| 220 | if (dyn_tag == DT_NULL) |
| 221 | break; |
| 222 | else if (dyn_tag == DT_HP_DLD_FLAGS) |
| 223 | { |
| 224 | /* Set dld_flags_addr and dld_flags in *dld_cache_p */ |
| 225 | dld_cache_p->dld_flags_addr = entry_addr + offsetof(Elf64_Dyn, d_un); |
| 226 | if (target_read_memory (dld_cache_p->dld_flags_addr, |
| 227 | (char*) &dld_cache_p->dld_flags, |
| 228 | sizeof (dld_cache_p->dld_flags)) |
| 229 | != 0) |
| 230 | { |
| 231 | error (_("Error while reading in .dynamic section of the program.")); |
| 232 | } |
| 233 | } |
| 234 | else if (dyn_tag == DT_HP_LOAD_MAP) |
| 235 | { |
| 236 | /* Dld will place the address of the load map at load_map_addr |
| 237 | after it starts running. */ |
| 238 | if (target_read_memory (entry_addr + offsetof(Elf64_Dyn, |
| 239 | d_un.d_ptr), |
| 240 | (char*) &dld_cache_p->load_map_addr, |
| 241 | sizeof (dld_cache_p->load_map_addr)) |
| 242 | != 0) |
| 243 | { |
| 244 | error (_("Error while reading in .dynamic section of the program.")); |
| 245 | } |
| 246 | } |
| 247 | else |
| 248 | { |
| 249 | /* tag is not of interest */ |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | /* Record other information and set is_valid to 1. */ |
| 254 | dld_cache_p->dyninfo_sect = dyninfo_sect; |
| 255 | |
| 256 | /* Verify that we read in required info. These fields are re-set to zero |
| 257 | in pa64_solib_restart. */ |
| 258 | |
| 259 | if (dld_cache_p->dld_flags_addr != 0 && dld_cache_p->load_map_addr != 0) |
| 260 | dld_cache_p->is_valid = 1; |
| 261 | else |
| 262 | return 0; |
| 263 | |
| 264 | return 1; |
| 265 | } |
| 266 | |
| 267 | /* |
| 268 | bfd_lookup_symbol -- lookup the value for a specific symbol |
| 269 | |
| 270 | An expensive way to lookup the value of a single symbol for |
| 271 | bfd's that are only temporary anyway. This is used by the |
| 272 | shared library support to find the address of the debugger |
| 273 | interface structures in the shared library. |
| 274 | |
| 275 | Note that 0 is specifically allowed as an error return (no |
| 276 | such symbol). |
| 277 | */ |
| 278 | |
| 279 | static CORE_ADDR |
| 280 | bfd_lookup_symbol (bfd *abfd, char *symname) |
| 281 | { |
| 282 | unsigned int storage_needed; |
| 283 | asymbol *sym; |
| 284 | asymbol **symbol_table; |
| 285 | unsigned int number_of_symbols; |
| 286 | unsigned int i; |
| 287 | struct cleanup *back_to; |
| 288 | CORE_ADDR symaddr = 0; |
| 289 | |
| 290 | storage_needed = bfd_get_symtab_upper_bound (abfd); |
| 291 | |
| 292 | if (storage_needed > 0) |
| 293 | { |
| 294 | symbol_table = (asymbol **) xmalloc (storage_needed); |
| 295 | back_to = make_cleanup (xfree, symbol_table); |
| 296 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
| 297 | |
| 298 | for (i = 0; i < number_of_symbols; i++) |
| 299 | { |
| 300 | sym = *symbol_table++; |
| 301 | if (strcmp (sym->name, symname) == 0) |
| 302 | { |
| 303 | /* Bfd symbols are section relative. */ |
| 304 | symaddr = sym->value + sym->section->vma; |
| 305 | break; |
| 306 | } |
| 307 | } |
| 308 | do_cleanups (back_to); |
| 309 | } |
| 310 | return (symaddr); |
| 311 | } |
| 312 | |
| 313 | |
| 314 | /* This hook gets called just before the first instruction in the |
| 315 | inferior process is executed. |
| 316 | |
| 317 | This is our opportunity to set magic flags in the inferior so |
| 318 | that GDB can be notified when a shared library is mapped in and |
| 319 | to tell the dynamic linker that a private copy of the library is |
| 320 | needed (so GDB can set breakpoints in the library). |
| 321 | |
| 322 | We need to set two flag bits in this routine. |
| 323 | |
| 324 | DT_HP_DEBUG_PRIVATE to indicate that shared libraries should be |
| 325 | mapped private. |
| 326 | |
| 327 | DT_HP_DEBUG_CALLBACK to indicate that we want the dynamic linker to |
| 328 | call the breakpoint routine for significant events. */ |
| 329 | |
| 330 | static void |
| 331 | pa64_solib_create_inferior_hook (void) |
| 332 | { |
| 333 | struct minimal_symbol *msymbol; |
| 334 | unsigned int dld_flags, status; |
| 335 | asection *shlib_info, *interp_sect; |
| 336 | char buf[4]; |
| 337 | struct objfile *objfile; |
| 338 | CORE_ADDR anaddr; |
| 339 | |
| 340 | /* First, remove all the solib event breakpoints. Their addresses |
| 341 | may have changed since the last time we ran the program. */ |
| 342 | remove_solib_event_breakpoints (); |
| 343 | |
| 344 | if (symfile_objfile == NULL) |
| 345 | return; |
| 346 | |
| 347 | /* First see if the objfile was dynamically linked. */ |
| 348 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, ".dynamic"); |
| 349 | if (!shlib_info) |
| 350 | return; |
| 351 | |
| 352 | /* It's got a .dynamic section, make sure it's not empty. */ |
| 353 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) |
| 354 | return; |
| 355 | |
| 356 | /* Read in the .dynamic section. */ |
| 357 | if (! read_dynamic_info (shlib_info, &dld_cache)) |
| 358 | error (_("Unable to read the .dynamic section.")); |
| 359 | |
| 360 | /* Turn on the flags we care about. */ |
| 361 | dld_cache.dld_flags |= DT_HP_DEBUG_PRIVATE; |
| 362 | dld_cache.dld_flags |= DT_HP_DEBUG_CALLBACK; |
| 363 | status = target_write_memory (dld_cache.dld_flags_addr, |
| 364 | (char *) &dld_cache.dld_flags, |
| 365 | sizeof (dld_cache.dld_flags)); |
| 366 | if (status != 0) |
| 367 | error (_("Unable to modify dynamic linker flags.")); |
| 368 | |
| 369 | /* Now we have to create a shared library breakpoint in the dynamic |
| 370 | linker. This can be somewhat tricky since the symbol is inside |
| 371 | the dynamic linker (for which we do not have symbols or a base |
| 372 | load address! Luckily I wrote this code for solib.c years ago. */ |
| 373 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); |
| 374 | if (interp_sect) |
| 375 | { |
| 376 | unsigned int interp_sect_size; |
| 377 | char *buf; |
| 378 | CORE_ADDR load_addr; |
| 379 | bfd *tmp_bfd; |
| 380 | CORE_ADDR sym_addr = 0; |
| 381 | |
| 382 | /* Read the contents of the .interp section into a local buffer; |
| 383 | the contents specify the dynamic linker this program uses. */ |
| 384 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); |
| 385 | buf = alloca (interp_sect_size); |
| 386 | bfd_get_section_contents (exec_bfd, interp_sect, |
| 387 | buf, 0, interp_sect_size); |
| 388 | |
| 389 | /* Now we need to figure out where the dynamic linker was |
| 390 | loaded so that we can load its symbols and place a breakpoint |
| 391 | in the dynamic linker itself. |
| 392 | |
| 393 | This address is stored on the stack. However, I've been unable |
| 394 | to find any magic formula to find it for Solaris (appears to |
| 395 | be trivial on GNU/Linux). Therefore, we have to try an alternate |
| 396 | mechanism to find the dynamic linker's base address. */ |
| 397 | tmp_bfd = bfd_openr (buf, gnutarget); |
| 398 | if (tmp_bfd == NULL) |
| 399 | return; |
| 400 | |
| 401 | /* Make sure the dynamic linker's really a useful object. */ |
| 402 | if (!bfd_check_format (tmp_bfd, bfd_object)) |
| 403 | { |
| 404 | warning (_("Unable to grok dynamic linker %s as an object file"), buf); |
| 405 | bfd_close (tmp_bfd); |
| 406 | return; |
| 407 | } |
| 408 | |
| 409 | /* We find the dynamic linker's base address by examining the |
| 410 | current pc (which point at the entry point for the dynamic |
| 411 | linker) and subtracting the offset of the entry point. |
| 412 | |
| 413 | Also note the breakpoint is the second instruction in the |
| 414 | routine. */ |
| 415 | load_addr = read_pc () - tmp_bfd->start_address; |
| 416 | sym_addr = bfd_lookup_symbol (tmp_bfd, "__dld_break"); |
| 417 | sym_addr = load_addr + sym_addr + 4; |
| 418 | |
| 419 | /* Create the shared library breakpoint. */ |
| 420 | { |
| 421 | struct breakpoint *b |
| 422 | = create_solib_event_breakpoint (sym_addr); |
| 423 | |
| 424 | /* The breakpoint is actually hard-coded into the dynamic linker, |
| 425 | so we don't need to actually insert a breakpoint instruction |
| 426 | there. In fact, the dynamic linker's code is immutable, even to |
| 427 | ttrace, so we shouldn't even try to do that. For cases like |
| 428 | this, we have "permanent" breakpoints. */ |
| 429 | make_breakpoint_permanent (b); |
| 430 | } |
| 431 | |
| 432 | /* We're done with the temporary bfd. */ |
| 433 | bfd_close (tmp_bfd); |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | static void |
| 438 | pa64_special_symbol_handling (void) |
| 439 | { |
| 440 | } |
| 441 | |
| 442 | static struct so_list * |
| 443 | pa64_current_sos (void) |
| 444 | { |
| 445 | struct so_list *head = 0; |
| 446 | struct so_list **link_ptr = &head; |
| 447 | int dll_index; |
| 448 | |
| 449 | /* Read in the load map pointer if we have not done so already. */ |
| 450 | if (! dld_cache.have_read_dld_descriptor) |
| 451 | if (! read_dld_descriptor ()) |
| 452 | return NULL; |
| 453 | |
| 454 | /* If the libraries were not mapped private, warn the user. */ |
| 455 | if ((dld_cache.dld_flags & DT_HP_DEBUG_PRIVATE) == 0) |
| 456 | warning (_("The shared libraries were not privately mapped; setting a\n" |
| 457 | "breakpoint in a shared library will not work until you rerun " |
| 458 | "the program.\n")); |
| 459 | |
| 460 | for (dll_index = -1; ; dll_index++) |
| 461 | { |
| 462 | struct load_module_desc dll_desc; |
| 463 | char *dll_path; |
| 464 | struct so_list *new; |
| 465 | struct cleanup *old_chain; |
| 466 | |
| 467 | if (dll_index == 0) |
| 468 | continue; |
| 469 | |
| 470 | /* Read in the load module descriptor. */ |
| 471 | if (dlgetmodinfo (dll_index, &dll_desc, sizeof (dll_desc), |
| 472 | pa64_target_read_memory, 0, dld_cache.load_map) |
| 473 | == 0) |
| 474 | break; |
| 475 | |
| 476 | /* Get the name of the shared library. */ |
| 477 | dll_path = (char *)dlgetname (&dll_desc, sizeof (dll_desc), |
| 478 | pa64_target_read_memory, |
| 479 | 0, dld_cache.load_map); |
| 480 | |
| 481 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); |
| 482 | memset (new, 0, sizeof (struct so_list)); |
| 483 | new->lm_info = (struct lm_info *) xmalloc (sizeof (struct lm_info)); |
| 484 | memset (new->lm_info, 0, sizeof (struct lm_info)); |
| 485 | |
| 486 | strncpy (new->so_name, dll_path, SO_NAME_MAX_PATH_SIZE - 1); |
| 487 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
| 488 | strcpy (new->so_original_name, new->so_name); |
| 489 | |
| 490 | memcpy (&new->lm_info->desc, &dll_desc, sizeof (dll_desc)); |
| 491 | |
| 492 | #ifdef SOLIB_PA64_DBG |
| 493 | { |
| 494 | struct load_module_desc *d = &new->lm_info->desc; |
| 495 | printf ("\n+ library \"%s\" is described at index %d\n", new->so_name, |
| 496 | dll_index); |
| 497 | printf (" text_base = 0x%llx\n", d->text_base); |
| 498 | printf (" text_size = 0x%llx\n", d->text_size); |
| 499 | printf (" data_base = 0x%llx\n", d->data_base); |
| 500 | printf (" data_size = 0x%llx\n", d->data_size); |
| 501 | printf (" unwind_base = 0x%llx\n", d->unwind_base); |
| 502 | printf (" linkage_ptr = 0x%llx\n", d->linkage_ptr); |
| 503 | printf (" phdr_base = 0x%llx\n", d->phdr_base); |
| 504 | printf (" tls_size = 0x%llx\n", d->tls_size); |
| 505 | printf (" tls_start_addr = 0x%llx\n", d->tls_start_addr); |
| 506 | printf (" unwind_size = 0x%llx\n", d->unwind_size); |
| 507 | printf (" tls_index = 0x%llx\n", d->tls_index); |
| 508 | } |
| 509 | #endif |
| 510 | |
| 511 | /* Link the new object onto the list. */ |
| 512 | new->next = NULL; |
| 513 | *link_ptr = new; |
| 514 | link_ptr = &new->next; |
| 515 | } |
| 516 | |
| 517 | return head; |
| 518 | } |
| 519 | |
| 520 | static int |
| 521 | pa64_open_symbol_file_object (void *from_ttyp) |
| 522 | { |
| 523 | int from_tty = *(int *)from_ttyp; |
| 524 | char buf[4]; |
| 525 | struct load_module_desc dll_desc; |
| 526 | char *dll_path; |
| 527 | |
| 528 | if (symfile_objfile) |
| 529 | if (!query ("Attempt to reload symbols from process? ")) |
| 530 | return 0; |
| 531 | |
| 532 | /* Read in the load map pointer if we have not done so already. */ |
| 533 | if (! dld_cache.have_read_dld_descriptor) |
| 534 | if (! read_dld_descriptor ()) |
| 535 | return 0; |
| 536 | |
| 537 | /* Read in the load module descriptor. */ |
| 538 | if (dlgetmodinfo (0, &dll_desc, sizeof (dll_desc), |
| 539 | pa64_target_read_memory, 0, dld_cache.load_map) == 0) |
| 540 | return 0; |
| 541 | |
| 542 | /* Get the name of the shared library. */ |
| 543 | dll_path = (char *)dlgetname (&dll_desc, sizeof (dll_desc), |
| 544 | pa64_target_read_memory, |
| 545 | 0, dld_cache.load_map); |
| 546 | |
| 547 | /* Have a pathname: read the symbol file. */ |
| 548 | symbol_file_add_main (dll_path, from_tty); |
| 549 | |
| 550 | return 1; |
| 551 | } |
| 552 | |
| 553 | /* Return nonzero if PC is an address inside the dynamic linker. */ |
| 554 | static int |
| 555 | pa64_in_dynsym_resolve_code (CORE_ADDR pc) |
| 556 | { |
| 557 | asection *shlib_info; |
| 558 | |
| 559 | if (symfile_objfile == NULL) |
| 560 | return 0; |
| 561 | |
| 562 | if (!dld_cache.have_read_dld_descriptor) |
| 563 | if (!read_dld_descriptor ()) |
| 564 | return 0; |
| 565 | |
| 566 | return (pc >= dld_cache.dld_desc.text_base |
| 567 | && pc < dld_cache.dld_desc.text_base + dld_cache.dld_desc.text_size); |
| 568 | } |
| 569 | |
| 570 | |
| 571 | /* Return the GOT value for the shared library in which ADDR belongs. If |
| 572 | ADDR isn't in any known shared library, return zero. */ |
| 573 | |
| 574 | static CORE_ADDR |
| 575 | pa64_solib_get_got_by_pc (CORE_ADDR addr) |
| 576 | { |
| 577 | struct so_list *so_list = master_so_list (); |
| 578 | CORE_ADDR got_value = 0; |
| 579 | |
| 580 | while (so_list) |
| 581 | { |
| 582 | if (so_list->lm_info->desc.text_base <= addr |
| 583 | && ((so_list->lm_info->desc.text_base |
| 584 | + so_list->lm_info->desc.text_size) |
| 585 | > addr)) |
| 586 | { |
| 587 | got_value = so_list->lm_info->desc.linkage_ptr; |
| 588 | break; |
| 589 | } |
| 590 | so_list = so_list->next; |
| 591 | } |
| 592 | return got_value; |
| 593 | } |
| 594 | |
| 595 | /* Get some HPUX-specific data from a shared lib. */ |
| 596 | static CORE_ADDR |
| 597 | pa64_solib_thread_start_addr (struct so_list *so) |
| 598 | { |
| 599 | return so->lm_info->desc.tls_start_addr; |
| 600 | } |
| 601 | |
| 602 | |
| 603 | /* Return the address of the handle of the shared library in which ADDR |
| 604 | belongs. If ADDR isn't in any known shared library, return zero. */ |
| 605 | |
| 606 | static CORE_ADDR |
| 607 | pa64_solib_get_solib_by_pc (CORE_ADDR addr) |
| 608 | { |
| 609 | struct so_list *so_list = master_so_list (); |
| 610 | CORE_ADDR retval = 0; |
| 611 | |
| 612 | while (so_list) |
| 613 | { |
| 614 | if (so_list->lm_info->desc.text_base <= addr |
| 615 | && ((so_list->lm_info->desc.text_base |
| 616 | + so_list->lm_info->desc.text_size) |
| 617 | > addr)) |
| 618 | { |
| 619 | retval = so_list->lm_info->desc_addr; |
| 620 | break; |
| 621 | } |
| 622 | so_list = so_list->next; |
| 623 | } |
| 624 | return retval; |
| 625 | } |
| 626 | |
| 627 | /* pa64 libraries do not seem to set the section offsets in a standard (i.e. |
| 628 | SVr4) way; the text section offset stored in the file doesn't correspond |
| 629 | to the place where the library is actually loaded into memory. Instead, |
| 630 | we rely on the dll descriptor to tell us where things were loaded. */ |
| 631 | static CORE_ADDR |
| 632 | pa64_solib_get_text_base (struct objfile *objfile) |
| 633 | { |
| 634 | struct so_list *so; |
| 635 | |
| 636 | for (so = master_so_list (); so; so = so->next) |
| 637 | if (so->objfile == objfile) |
| 638 | return so->lm_info->desc.text_base; |
| 639 | |
| 640 | return 0; |
| 641 | } |
| 642 | |
| 643 | static struct target_so_ops pa64_so_ops; |
| 644 | |
| 645 | extern initialize_file_ftype _initialize_pa64_solib; /* -Wmissing-prototypes */ |
| 646 | |
| 647 | void |
| 648 | _initialize_pa64_solib (void) |
| 649 | { |
| 650 | pa64_so_ops.relocate_section_addresses = pa64_relocate_section_addresses; |
| 651 | pa64_so_ops.free_so = pa64_free_so; |
| 652 | pa64_so_ops.clear_solib = pa64_clear_solib; |
| 653 | pa64_so_ops.solib_create_inferior_hook = pa64_solib_create_inferior_hook; |
| 654 | pa64_so_ops.special_symbol_handling = pa64_special_symbol_handling; |
| 655 | pa64_so_ops.current_sos = pa64_current_sos; |
| 656 | pa64_so_ops.open_symbol_file_object = pa64_open_symbol_file_object; |
| 657 | pa64_so_ops.in_dynsym_resolve_code = pa64_in_dynsym_resolve_code; |
| 658 | |
| 659 | memset (&dld_cache, 0, sizeof (dld_cache)); |
| 660 | } |
| 661 | |
| 662 | void pa64_solib_select (struct gdbarch *gdbarch) |
| 663 | { |
| 664 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 665 | set_solib_ops (gdbarch, &pa64_so_ops); |
| 666 | |
| 667 | tdep->solib_thread_start_addr = pa64_solib_thread_start_addr; |
| 668 | tdep->solib_get_got_by_pc = pa64_solib_get_got_by_pc; |
| 669 | tdep->solib_get_solib_by_pc = pa64_solib_get_solib_by_pc; |
| 670 | tdep->solib_get_text_base = pa64_solib_get_text_base; |
| 671 | } |
| 672 | |
| 673 | #else /* HAVE_ELF_HP_H */ |
| 674 | |
| 675 | extern initialize_file_ftype _initialize_pa64_solib; /* -Wmissing-prototypes */ |
| 676 | |
| 677 | void |
| 678 | _initialize_pa64_solib (void) |
| 679 | { |
| 680 | } |
| 681 | |
| 682 | void pa64_solib_select (struct gdbarch *gdbarch) |
| 683 | { |
| 684 | /* For a SOM-only target, there is no pa64 solib support. This is needed |
| 685 | for hppa-hpux-tdep.c to build. */ |
| 686 | error (_("Cannot select pa64 solib support for this configuration.")); |
| 687 | } |
| 688 | #endif |