| 1 | /* Handle HP ELF shared libraries for GDB, the GNU Debugger. |
| 2 | Copyright 1999 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, |
| 19 | Boston, MA 02111-1307, USA. |
| 20 | |
| 21 | HP in their infinite stupidity choose not to use standard ELF dynamic |
| 22 | linker interfaces. They also choose not to make their ELF dymamic |
| 23 | linker interfaces compatible with the SOM dynamic linker. The |
| 24 | net result is we can not use either of the existing somsolib.c or |
| 25 | solib.c. What a crock. |
| 26 | |
| 27 | Even more disgusting. This file depends on functions provided only |
| 28 | in certain PA64 libraries. Thus this file is supposed to only be |
| 29 | used native. When will HP ever learn that they need to provide the |
| 30 | same functionality in all their libraries! */ |
| 31 | |
| 32 | #include <dlfcn.h> |
| 33 | #include <elf.h> |
| 34 | #include <elf_hp.h> |
| 35 | |
| 36 | #include "defs.h" |
| 37 | |
| 38 | #include "frame.h" |
| 39 | #include "bfd.h" |
| 40 | #include "libhppa.h" |
| 41 | #include "gdbcore.h" |
| 42 | #include "symtab.h" |
| 43 | #include "breakpoint.h" |
| 44 | #include "symfile.h" |
| 45 | #include "objfiles.h" |
| 46 | #include "inferior.h" |
| 47 | #include "gdb-stabs.h" |
| 48 | #include "gdb_stat.h" |
| 49 | #include "gdbcmd.h" |
| 50 | #include "assert.h" |
| 51 | #include "language.h" |
| 52 | |
| 53 | #include <fcntl.h> |
| 54 | |
| 55 | #ifndef O_BINARY |
| 56 | #define O_BINARY 0 |
| 57 | #endif |
| 58 | |
| 59 | /* Defined in exec.c; used to prevent dangling pointer bug. */ |
| 60 | extern struct target_ops exec_ops; |
| 61 | |
| 62 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *); |
| 63 | /* This lives in hppa-tdep.c. */ |
| 64 | extern struct unwind_table_entry *find_unwind_entry (CORE_ADDR pc); |
| 65 | |
| 66 | /* These ought to be defined in some public interface, but aren't. They |
| 67 | identify dynamic linker events. */ |
| 68 | #define DLD_CB_LOAD 1 |
| 69 | #define DLD_CB_UNLOAD 0 |
| 70 | |
| 71 | /* A structure to keep track of all the known shared objects. */ |
| 72 | struct so_list |
| 73 | { |
| 74 | bfd *abfd; |
| 75 | char *name; |
| 76 | struct so_list *next; |
| 77 | struct objfile *objfile; |
| 78 | CORE_ADDR pa64_solib_desc_addr; |
| 79 | struct load_module_desc pa64_solib_desc; |
| 80 | struct section_table *sections; |
| 81 | struct section_table *sections_end; |
| 82 | boolean loaded; |
| 83 | }; |
| 84 | |
| 85 | static struct so_list *so_list_head; |
| 86 | |
| 87 | /* This is the cumulative size in bytes of the symbol tables of all |
| 88 | shared objects on the so_list_head list. (When we say size, here |
| 89 | we mean of the information before it is brought into memory and |
| 90 | potentially expanded by GDB.) When adding a new shlib, this value |
| 91 | is compared against the threshold size, held by auto_solib_add |
| 92 | (in megabytes). If adding symbols for the new shlib would cause |
| 93 | the total size to exceed the threshold, then the new shlib's symbols |
| 94 | are not loaded. */ |
| 95 | static LONGEST pa64_solib_total_st_size; |
| 96 | |
| 97 | /* When the threshold is reached for any shlib, we refuse to add |
| 98 | symbols for subsequent shlibs, even if those shlibs' symbols would |
| 99 | be small enough to fit under the threshold. (Although this may |
| 100 | result in one, early large shlib preventing the loading of later, |
| 101 | smalller shlibs' symbols, it allows us to issue one informational |
| 102 | message. The alternative, to issue a message for each shlib whose |
| 103 | symbols aren't loaded, could be a big annoyance where the threshold |
| 104 | is exceeded due to a very large number of shlibs.) */ |
| 105 | static int pa64_solib_st_size_threshold_exceeded; |
| 106 | |
| 107 | /* When adding fields, be sure to clear them in _initialize_pa64_solib. */ |
| 108 | typedef struct |
| 109 | { |
| 110 | CORE_ADDR dld_flags_addr; |
| 111 | long long dld_flags; |
| 112 | sec_ptr dyninfo_sect; |
| 113 | boolean have_read_dld_descriptor; |
| 114 | boolean is_valid; |
| 115 | CORE_ADDR load_map; |
| 116 | CORE_ADDR load_map_addr; |
| 117 | struct load_module_desc dld_desc; |
| 118 | } |
| 119 | dld_cache_t; |
| 120 | |
| 121 | static dld_cache_t dld_cache; |
| 122 | |
| 123 | static void pa64_sharedlibrary_info_command (char *, int); |
| 124 | |
| 125 | static void pa64_solib_sharedlibrary_command (char *, int); |
| 126 | |
| 127 | static void *pa64_target_read_memory (void *, CORE_ADDR, size_t, int); |
| 128 | |
| 129 | static boolean read_dld_descriptor (struct target_ops *); |
| 130 | |
| 131 | static boolean read_dynamic_info (asection *, dld_cache_t *); |
| 132 | |
| 133 | static void add_to_solist (boolean, char *, struct load_module_desc *, |
| 134 | CORE_ADDR, struct target_ops *); |
| 135 | |
| 136 | /* When examining the shared library for debugging information we have to |
| 137 | look for HP debug symbols, stabs and dwarf2 debug symbols. */ |
| 138 | static char *pa64_debug_section_names[] = { |
| 139 | ".debug_header", ".debug_gntt", ".debug_lntt", ".debug_slt", ".debug_vt", |
| 140 | ".stabs", ".stabstr", ".debug_info", ".debug_abbrev", ".debug_aranges", |
| 141 | ".debug_macinfo", ".debug_line", ".debug_loc", ".debug_pubnames", |
| 142 | ".debug_str", NULL |
| 143 | }; |
| 144 | |
| 145 | /* Return a ballbark figure for the amount of memory GDB will need to |
| 146 | allocate to read in the debug symbols from FILENAME. */ |
| 147 | static LONGEST |
| 148 | pa64_solib_sizeof_symbol_table (char *filename) |
| 149 | { |
| 150 | bfd *abfd; |
| 151 | int i; |
| 152 | int desc; |
| 153 | char *absolute_name; |
| 154 | LONGEST st_size = (LONGEST) 0; |
| 155 | asection *sect; |
| 156 | |
| 157 | /* We believe that filename was handed to us by the dynamic linker, and |
| 158 | is therefore always an absolute path. */ |
| 159 | desc = openp (getenv ("PATH"), 1, filename, O_RDONLY | O_BINARY, |
| 160 | 0, &absolute_name); |
| 161 | if (desc < 0) |
| 162 | { |
| 163 | perror_with_name (filename); |
| 164 | } |
| 165 | filename = absolute_name; |
| 166 | |
| 167 | abfd = bfd_fdopenr (filename, gnutarget, desc); |
| 168 | if (!abfd) |
| 169 | { |
| 170 | close (desc); |
| 171 | make_cleanup (free, filename); |
| 172 | error ("\"%s\": can't open to read symbols: %s.", filename, |
| 173 | bfd_errmsg (bfd_get_error ())); |
| 174 | } |
| 175 | |
| 176 | if (!bfd_check_format (abfd, bfd_object)) |
| 177 | { |
| 178 | bfd_close (abfd); |
| 179 | make_cleanup (free, filename); |
| 180 | error ("\"%s\": can't read symbols: %s.", filename, |
| 181 | bfd_errmsg (bfd_get_error ())); |
| 182 | } |
| 183 | |
| 184 | /* Sum the sizes of the various sections that compose debug info. */ |
| 185 | for (i = 0; pa64_debug_section_names[i] != NULL; i++) |
| 186 | { |
| 187 | asection *sect; |
| 188 | |
| 189 | sect = bfd_get_section_by_name (abfd, pa64_debug_section_names[i]); |
| 190 | if (sect) |
| 191 | st_size += (LONGEST)bfd_section_size (abfd, sect); |
| 192 | } |
| 193 | |
| 194 | bfd_close (abfd); |
| 195 | free (filename); |
| 196 | |
| 197 | /* Unfortunately, just summing the sizes of various debug info |
| 198 | sections isn't a very accurate measurement of how much heap |
| 199 | space the debugger will need to hold them. It also doesn't |
| 200 | account for space needed by linker (aka "minimal") symbols. |
| 201 | |
| 202 | Anecdotal evidence suggests that just summing the sizes of |
| 203 | debug-info-related sections understates the heap space needed |
| 204 | to represent it internally by about an order of magnitude. |
| 205 | |
| 206 | Since it's not exactly brain surgery we're doing here, rather |
| 207 | than attempt to more accurately measure the size of a shlib's |
| 208 | symbol table in GDB's heap, we'll just apply a 10x fudge- |
| 209 | factor to the debug info sections' size-sum. No, this doesn't |
| 210 | account for minimal symbols in non-debuggable shlibs. But it |
| 211 | all roughly washes out in the end. */ |
| 212 | return st_size * (LONGEST) 10; |
| 213 | } |
| 214 | |
| 215 | /* Add a shared library to the objfile list and load its symbols into |
| 216 | GDB's symbol table. */ |
| 217 | static void |
| 218 | pa64_solib_add_solib_objfile (struct so_list *so, char *name, int from_tty, |
| 219 | CORE_ADDR text_addr) |
| 220 | { |
| 221 | bfd *tmp_bfd; |
| 222 | asection *sec; |
| 223 | obj_private_data_t *obj_private; |
| 224 | struct section_addr_info section_addrs; |
| 225 | |
| 226 | memset (§ion_addrs, 0, sizeof (section_addrs)); |
| 227 | /* We need the BFD so that we can look at its sections. We open up the |
| 228 | file temporarily, then close it when we are done. */ |
| 229 | tmp_bfd = bfd_openr (name, gnutarget); |
| 230 | if (tmp_bfd == NULL) |
| 231 | { |
| 232 | perror_with_name (name); |
| 233 | return; |
| 234 | } |
| 235 | |
| 236 | if (!bfd_check_format (tmp_bfd, bfd_object)) |
| 237 | { |
| 238 | bfd_close (tmp_bfd); |
| 239 | error ("\"%s\" is not an object file: %s", name, |
| 240 | bfd_errmsg (bfd_get_error ())); |
| 241 | } |
| 242 | |
| 243 | |
| 244 | /* Undo some braindamage from symfile.c. |
| 245 | |
| 246 | First, symfile.c will subtract the VMA of the first .text section |
| 247 | in the shared library that it finds. Undo that. */ |
| 248 | sec = bfd_get_section_by_name (tmp_bfd, ".text"); |
| 249 | text_addr += bfd_section_vma (tmp_bfd, sec); |
| 250 | |
| 251 | /* Now find the true lowest section in the shared library. */ |
| 252 | sec = NULL; |
| 253 | bfd_map_over_sections (tmp_bfd, find_lowest_section, (PTR) &sec); |
| 254 | |
| 255 | if (sec) |
| 256 | { |
| 257 | /* Subtract out the VMA of the lowest section. */ |
| 258 | text_addr -= bfd_section_vma (tmp_bfd, sec); |
| 259 | |
| 260 | /* ??? Add back in the filepos of that lowest section. */ |
| 261 | text_addr += sec->filepos; |
| 262 | } |
| 263 | |
| 264 | /* We are done with the temporary bfd. Get rid of it and make sure |
| 265 | nobody else can us it. */ |
| 266 | bfd_close (tmp_bfd); |
| 267 | tmp_bfd = NULL; |
| 268 | |
| 269 | /* Now let the generic code load up symbols for this library. */ |
| 270 | section_addrs.other[0].addr = text_addr; |
| 271 | section_addrs.other[0].name = ".text"; |
| 272 | so->objfile = symbol_file_add (name, from_tty, §ion_addrs, 0, OBJF_SHARED); |
| 273 | so->abfd = so->objfile->obfd; |
| 274 | |
| 275 | /* Mark this as a shared library and save private data. */ |
| 276 | so->objfile->flags |= OBJF_SHARED; |
| 277 | |
| 278 | if (so->objfile->obj_private == NULL) |
| 279 | { |
| 280 | obj_private = (obj_private_data_t *) |
| 281 | obstack_alloc (&so->objfile->psymbol_obstack, |
| 282 | sizeof (obj_private_data_t)); |
| 283 | obj_private->unwind_info = NULL; |
| 284 | obj_private->so_info = NULL; |
| 285 | so->objfile->obj_private = (PTR) obj_private; |
| 286 | } |
| 287 | |
| 288 | obj_private = (obj_private_data_t *) so->objfile->obj_private; |
| 289 | obj_private->so_info = so; |
| 290 | obj_private->dp = so->pa64_solib_desc.linkage_ptr; |
| 291 | } |
| 292 | |
| 293 | /* Load debugging information for a shared library. TARGET may be |
| 294 | NULL if we are not attaching to a process or reading a core file. */ |
| 295 | |
| 296 | static void |
| 297 | pa64_solib_load_symbols (struct so_list *so, char *name, int from_tty, |
| 298 | CORE_ADDR text_addr, struct target_ops *target) |
| 299 | { |
| 300 | struct section_table *p; |
| 301 | asection *sec; |
| 302 | int status; |
| 303 | char buf[4]; |
| 304 | CORE_ADDR presumed_data_start; |
| 305 | |
| 306 | if (text_addr == 0) |
| 307 | text_addr = so->pa64_solib_desc.text_base; |
| 308 | |
| 309 | pa64_solib_add_solib_objfile (so, name, from_tty, text_addr); |
| 310 | |
| 311 | /* Now we need to build a section table for this library since |
| 312 | we might be debugging a core file from a dynamically linked |
| 313 | executable in which the libraries were not privately mapped. */ |
| 314 | if (build_section_table (so->abfd, |
| 315 | &so->sections, |
| 316 | &so->sections_end)) |
| 317 | { |
| 318 | error ("Unable to build section table for shared library\n."); |
| 319 | return; |
| 320 | } |
| 321 | |
| 322 | ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT (so->objfile)) |
| 323 | = so->pa64_solib_desc.text_base; |
| 324 | ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA (so->objfile)) |
| 325 | = so->pa64_solib_desc.data_base; |
| 326 | |
| 327 | /* Relocate all the sections based on where they got loaded. */ |
| 328 | for (p = so->sections; p < so->sections_end; p++) |
| 329 | { |
| 330 | if (p->the_bfd_section->flags & SEC_CODE) |
| 331 | { |
| 332 | p->addr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT (so->objfile)); |
| 333 | p->endaddr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT (so->objfile)); |
| 334 | } |
| 335 | else if (p->the_bfd_section->flags & SEC_DATA) |
| 336 | { |
| 337 | p->addr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA (so->objfile)); |
| 338 | p->endaddr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA (so->objfile)); |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | /* Now see if we need to map in the text and data for this shared |
| 343 | library (for example debugging a core file which does not use |
| 344 | private shared libraries.). |
| 345 | |
| 346 | Carefully peek at the first text address in the library. If the |
| 347 | read succeeds, then the libraries were privately mapped and were |
| 348 | included in the core dump file. |
| 349 | |
| 350 | If the peek failed, then the libraries were not privately mapped |
| 351 | and are not in the core file, we'll have to read them in ourselves. */ |
| 352 | status = target_read_memory (text_addr, buf, 4); |
| 353 | if (status != 0) |
| 354 | { |
| 355 | int new, old; |
| 356 | |
| 357 | new = so->sections_end - so->sections; |
| 358 | |
| 359 | old = target_resize_to_sections (target, new); |
| 360 | |
| 361 | /* Copy over the old data before it gets clobbered. */ |
| 362 | memcpy ((char *) (target->to_sections + old), |
| 363 | so->sections, |
| 364 | ((sizeof (struct section_table)) * new)); |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | |
| 369 | /* Add symbols from shared libraries into the symtab list, unless the |
| 370 | size threshold (specified by auto_solib_add, in megabytes) would |
| 371 | be exceeded. */ |
| 372 | |
| 373 | void |
| 374 | pa64_solib_add (char *arg_string, int from_tty, struct target_ops *target) |
| 375 | { |
| 376 | struct minimal_symbol *msymbol; |
| 377 | CORE_ADDR addr; |
| 378 | asection *shlib_info; |
| 379 | int status; |
| 380 | unsigned int dld_flags; |
| 381 | char buf[4], *re_err; |
| 382 | int threshold_warning_given = 0; |
| 383 | int dll_index; |
| 384 | struct load_module_desc dll_desc; |
| 385 | char *dll_path; |
| 386 | |
| 387 | /* First validate our arguments. */ |
| 388 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) |
| 389 | { |
| 390 | error ("Invalid regexp: %s", re_err); |
| 391 | } |
| 392 | |
| 393 | /* If we're debugging a core file, or have attached to a running |
| 394 | process, then pa64_solib_create_inferior_hook will not have been |
| 395 | called. |
| 396 | |
| 397 | We need to first determine if we're dealing with a dynamically |
| 398 | linked executable. If not, then return without an error or warning. |
| 399 | |
| 400 | We also need to examine __dld_flags to determine if the shared library |
| 401 | list is valid and to determine if the libraries have been privately |
| 402 | mapped. */ |
| 403 | if (symfile_objfile == NULL) |
| 404 | return; |
| 405 | |
| 406 | /* First see if the objfile was dynamically linked. */ |
| 407 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, ".dynamic"); |
| 408 | if (!shlib_info) |
| 409 | return; |
| 410 | |
| 411 | /* It's got a .dynamic section, make sure it's not empty. */ |
| 412 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) |
| 413 | return; |
| 414 | |
| 415 | /* Read in the load map pointer if we have not done so already. */ |
| 416 | if (! dld_cache.have_read_dld_descriptor) |
| 417 | if (! read_dld_descriptor (target)) |
| 418 | return; |
| 419 | |
| 420 | /* If the libraries were not mapped private, warn the user. */ |
| 421 | if ((dld_cache.dld_flags & DT_HP_DEBUG_PRIVATE) == 0) |
| 422 | warning ("The shared libraries were not privately mapped; setting a\nbreakpoint in a shared library will not work until you rerun the program.\n"); |
| 423 | |
| 424 | /* For each shaerd library, add it to the shared library list. */ |
| 425 | for (dll_index = 1; ; dll_index++) |
| 426 | { |
| 427 | /* Read in the load module descriptor. */ |
| 428 | if (dlgetmodinfo (dll_index, &dll_desc, sizeof (dll_desc), |
| 429 | pa64_target_read_memory, 0, dld_cache.load_map) |
| 430 | == 0) |
| 431 | return; |
| 432 | |
| 433 | /* Get the name of the shared library. */ |
| 434 | dll_path = (char *)dlgetname (&dll_desc, sizeof (dll_desc), |
| 435 | pa64_target_read_memory, |
| 436 | 0, dld_cache.load_map); |
| 437 | |
| 438 | if (!dll_path) |
| 439 | error ("pa64_solib_add, unable to read shared library path."); |
| 440 | |
| 441 | add_to_solist (from_tty, dll_path, &dll_desc, 0, target); |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | |
| 446 | /* This hook gets called just before the first instruction in the |
| 447 | inferior process is executed. |
| 448 | |
| 449 | This is our opportunity to set magic flags in the inferior so |
| 450 | that GDB can be notified when a shared library is mapped in and |
| 451 | to tell the dynamic linker that a private copy of the library is |
| 452 | needed (so GDB can set breakpoints in the library). |
| 453 | |
| 454 | We need to set two flag bits in this routine. |
| 455 | |
| 456 | DT_HP_DEBUG_PRIVATE to indicate that shared libraries should be |
| 457 | mapped private. |
| 458 | |
| 459 | DT_HP_DEBUG_CALLBACK to indicate that we want the dynamic linker to |
| 460 | call the breakpoint routine for significant events. */ |
| 461 | |
| 462 | void |
| 463 | pa64_solib_create_inferior_hook (void) |
| 464 | { |
| 465 | struct minimal_symbol *msymbol; |
| 466 | unsigned int dld_flags, status; |
| 467 | asection *shlib_info, *interp_sect; |
| 468 | char buf[4]; |
| 469 | struct objfile *objfile; |
| 470 | CORE_ADDR anaddr; |
| 471 | |
| 472 | /* First, remove all the solib event breakpoints. Their addresses |
| 473 | may have changed since the last time we ran the program. */ |
| 474 | remove_solib_event_breakpoints (); |
| 475 | |
| 476 | if (symfile_objfile == NULL) |
| 477 | return; |
| 478 | |
| 479 | /* First see if the objfile was dynamically linked. */ |
| 480 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, ".dynamic"); |
| 481 | if (!shlib_info) |
| 482 | return; |
| 483 | |
| 484 | /* It's got a .dynamic section, make sure it's not empty. */ |
| 485 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) |
| 486 | return; |
| 487 | |
| 488 | /* Read in the .dynamic section. */ |
| 489 | if (! read_dynamic_info (shlib_info, &dld_cache)) |
| 490 | error ("Unable to read the .dynamic section."); |
| 491 | |
| 492 | /* Turn on the flags we care about. */ |
| 493 | dld_cache.dld_flags |= DT_HP_DEBUG_PRIVATE; |
| 494 | dld_cache.dld_flags |= DT_HP_DEBUG_CALLBACK; |
| 495 | status = target_write_memory (dld_cache.dld_flags_addr, |
| 496 | (char *) &dld_cache.dld_flags, |
| 497 | sizeof (dld_cache.dld_flags)); |
| 498 | if (status != 0) |
| 499 | error ("Unable to modify dynamic linker flags."); |
| 500 | |
| 501 | /* Now we have to create a shared library breakpoint in the dynamic |
| 502 | linker. This can be somewhat tricky since the symbol is inside |
| 503 | the dynamic linker (for which we do not have symbols or a base |
| 504 | load address! Luckily I wrote this code for solib.c years ago. */ |
| 505 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); |
| 506 | if (interp_sect) |
| 507 | { |
| 508 | unsigned int interp_sect_size; |
| 509 | char *buf; |
| 510 | CORE_ADDR load_addr; |
| 511 | bfd *tmp_bfd; |
| 512 | CORE_ADDR sym_addr = 0; |
| 513 | |
| 514 | /* Read the contents of the .interp section into a local buffer; |
| 515 | the contents specify the dynamic linker this program uses. */ |
| 516 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); |
| 517 | buf = alloca (interp_sect_size); |
| 518 | bfd_get_section_contents (exec_bfd, interp_sect, |
| 519 | buf, 0, interp_sect_size); |
| 520 | |
| 521 | /* Now we need to figure out where the dynamic linker was |
| 522 | loaded so that we can load its symbols and place a breakpoint |
| 523 | in the dynamic linker itself. |
| 524 | |
| 525 | This address is stored on the stack. However, I've been unable |
| 526 | to find any magic formula to find it for Solaris (appears to |
| 527 | be trivial on GNU/Linux). Therefore, we have to try an alternate |
| 528 | mechanism to find the dynamic linker's base address. */ |
| 529 | tmp_bfd = bfd_openr (buf, gnutarget); |
| 530 | if (tmp_bfd == NULL) |
| 531 | goto get_out; |
| 532 | |
| 533 | /* Make sure the dynamic linker's really a useful object. */ |
| 534 | if (!bfd_check_format (tmp_bfd, bfd_object)) |
| 535 | { |
| 536 | warning ("Unable to grok dynamic linker %s as an object file", buf); |
| 537 | bfd_close (tmp_bfd); |
| 538 | goto get_out; |
| 539 | } |
| 540 | |
| 541 | /* We find the dynamic linker's base address by examining the |
| 542 | current pc (which point at the entry point for the dynamic |
| 543 | linker) and subtracting the offset of the entry point. |
| 544 | |
| 545 | Also note the breakpoint is the second instruction in the |
| 546 | routine. */ |
| 547 | load_addr = read_pc () - tmp_bfd->start_address; |
| 548 | sym_addr = bfd_lookup_symbol (tmp_bfd, "__dld_break"); |
| 549 | sym_addr = load_addr + sym_addr + 4; |
| 550 | |
| 551 | /* Create the shared library breakpoint. */ |
| 552 | { |
| 553 | struct breakpoint *b |
| 554 | = create_solib_event_breakpoint (sym_addr); |
| 555 | |
| 556 | /* The breakpoint is actually hard-coded into the dynamic linker, |
| 557 | so we don't need to actually insert a breakpoint instruction |
| 558 | there. In fact, the dynamic linker's code is immutable, even to |
| 559 | ttrace, so we shouldn't even try to do that. For cases like |
| 560 | this, we have "permanent" breakpoints. */ |
| 561 | make_breakpoint_permanent (b); |
| 562 | } |
| 563 | |
| 564 | /* We're done with the temporary bfd. */ |
| 565 | bfd_close (tmp_bfd); |
| 566 | } |
| 567 | |
| 568 | get_out: |
| 569 | /* Wipe out all knowledge of old shared libraries since their |
| 570 | mapping can change from one exec to another! */ |
| 571 | while (so_list_head) |
| 572 | { |
| 573 | struct so_list *temp; |
| 574 | |
| 575 | temp = so_list_head; |
| 576 | free (so_list_head); |
| 577 | so_list_head = temp->next; |
| 578 | } |
| 579 | clear_symtab_users (); |
| 580 | } |
| 581 | |
| 582 | /* This operation removes the "hook" between GDB and the dynamic linker, |
| 583 | which causes the dld to notify GDB of shared library events. |
| 584 | |
| 585 | After this operation completes, the dld will no longer notify GDB of |
| 586 | shared library events. To resume notifications, GDB must call |
| 587 | pa64_solib_create_inferior_hook. |
| 588 | |
| 589 | This operation does not remove any knowledge of shared libraries which |
| 590 | GDB may already have been notified of. */ |
| 591 | |
| 592 | void |
| 593 | pa64_solib_remove_inferior_hook (int pid) |
| 594 | { |
| 595 | /* Turn off the DT_HP_DEBUG_CALLBACK bit in the dynamic linker flags. */ |
| 596 | dld_cache.dld_flags &= ~DT_HP_DEBUG_CALLBACK; |
| 597 | target_write_memory (dld_cache.dld_flags_addr, |
| 598 | (char *)&dld_cache.dld_flags, |
| 599 | sizeof (dld_cache.dld_flags)); |
| 600 | } |
| 601 | |
| 602 | /* This function creates a breakpoint on the dynamic linker hook, which |
| 603 | is called when e.g., a shl_load or shl_unload call is made. This |
| 604 | breakpoint will only trigger when a shl_load call is made. |
| 605 | |
| 606 | If filename is NULL, then loads of any dll will be caught. Else, |
| 607 | only loads of the file whose pathname is the string contained by |
| 608 | filename will be caught. |
| 609 | |
| 610 | Undefined behaviour is guaranteed if this function is called before |
| 611 | pa64_solib_create_inferior_hook. */ |
| 612 | |
| 613 | void |
| 614 | pa64_solib_create_catch_load_hook (int pid, int tempflag, char *filename, |
| 615 | char *cond_string) |
| 616 | { |
| 617 | create_solib_load_event_breakpoint ("", tempflag, filename, cond_string); |
| 618 | } |
| 619 | |
| 620 | /* This function creates a breakpoint on the dynamic linker hook, which |
| 621 | is called when e.g., a shl_load or shl_unload call is made. This |
| 622 | breakpoint will only trigger when a shl_unload call is made. |
| 623 | |
| 624 | If filename is NULL, then unloads of any dll will be caught. Else, |
| 625 | only unloads of the file whose pathname is the string contained by |
| 626 | filename will be caught. |
| 627 | |
| 628 | Undefined behaviour is guaranteed if this function is called before |
| 629 | pa64_solib_create_inferior_hook. */ |
| 630 | |
| 631 | void |
| 632 | pa64_solib_create_catch_unload_hook (int pid, int tempflag, char *filename, |
| 633 | char *cond_string) |
| 634 | { |
| 635 | create_solib_unload_event_breakpoint ("", tempflag, filename, cond_string); |
| 636 | } |
| 637 | |
| 638 | /* Return nonzero if the dynamic linker has reproted that a library |
| 639 | has been loaded. */ |
| 640 | |
| 641 | int |
| 642 | pa64_solib_have_load_event (int pid) |
| 643 | { |
| 644 | CORE_ADDR event_kind; |
| 645 | |
| 646 | event_kind = read_register (ARG0_REGNUM); |
| 647 | return (event_kind == DLD_CB_LOAD); |
| 648 | } |
| 649 | |
| 650 | /* Return nonzero if the dynamic linker has reproted that a library |
| 651 | has been unloaded. */ |
| 652 | int |
| 653 | pa64_solib_have_unload_event (int pid) |
| 654 | { |
| 655 | CORE_ADDR event_kind; |
| 656 | |
| 657 | event_kind = read_register (ARG0_REGNUM); |
| 658 | return (event_kind == DLD_CB_UNLOAD); |
| 659 | } |
| 660 | |
| 661 | /* Return a pointer to a string indicating the pathname of the most |
| 662 | recently loaded library. |
| 663 | |
| 664 | The caller is reposible for copying the string before the inferior is |
| 665 | restarted. */ |
| 666 | |
| 667 | char * |
| 668 | pa64_solib_loaded_library_pathname (int pid) |
| 669 | { |
| 670 | static char dll_path[MAXPATHLEN]; |
| 671 | CORE_ADDR dll_path_addr = read_register (ARG3_REGNUM); |
| 672 | read_memory_string (dll_path_addr, dll_path, MAXPATHLEN); |
| 673 | return dll_path; |
| 674 | } |
| 675 | |
| 676 | /* Return a pointer to a string indicating the pathname of the most |
| 677 | recently unloaded library. |
| 678 | |
| 679 | The caller is reposible for copying the string before the inferior is |
| 680 | restarted. */ |
| 681 | |
| 682 | char * |
| 683 | pa64_solib_unloaded_library_pathname (int pid) |
| 684 | { |
| 685 | static char dll_path[MAXPATHLEN]; |
| 686 | CORE_ADDR dll_path_addr = read_register (ARG3_REGNUM); |
| 687 | read_memory_string (dll_path_addr, dll_path, MAXPATHLEN); |
| 688 | return dll_path; |
| 689 | } |
| 690 | |
| 691 | /* Return nonzero if PC is an address inside the dynamic linker. */ |
| 692 | |
| 693 | int |
| 694 | pa64_solib_in_dynamic_linker (int pid, CORE_ADDR pc) |
| 695 | { |
| 696 | asection *shlib_info; |
| 697 | |
| 698 | if (symfile_objfile == NULL) |
| 699 | return 0; |
| 700 | |
| 701 | if (!dld_cache.have_read_dld_descriptor) |
| 702 | if (!read_dld_descriptor (¤t_target)) |
| 703 | return 0; |
| 704 | |
| 705 | return (pc >= dld_cache.dld_desc.text_base |
| 706 | && pc < dld_cache.dld_desc.text_base + dld_cache.dld_desc.text_size); |
| 707 | } |
| 708 | |
| 709 | |
| 710 | /* Return the GOT value for the shared library in which ADDR belongs. If |
| 711 | ADDR isn't in any known shared library, return zero. */ |
| 712 | |
| 713 | CORE_ADDR |
| 714 | pa64_solib_get_got_by_pc (CORE_ADDR addr) |
| 715 | { |
| 716 | struct so_list *so_list = so_list_head; |
| 717 | CORE_ADDR got_value = 0; |
| 718 | |
| 719 | while (so_list) |
| 720 | { |
| 721 | if (so_list->pa64_solib_desc.text_base <= addr |
| 722 | && ((so_list->pa64_solib_desc.text_base |
| 723 | + so_list->pa64_solib_desc.text_size) |
| 724 | > addr)) |
| 725 | { |
| 726 | got_value = so_list->pa64_solib_desc.linkage_ptr; |
| 727 | break; |
| 728 | } |
| 729 | so_list = so_list->next; |
| 730 | } |
| 731 | return got_value; |
| 732 | } |
| 733 | |
| 734 | /* Return the address of the handle of the shared library in which ADDR |
| 735 | belongs. If ADDR isn't in any known shared library, return zero. |
| 736 | |
| 737 | This function is used in hppa_fix_call_dummy in hppa-tdep.c. */ |
| 738 | |
| 739 | CORE_ADDR |
| 740 | pa64_solib_get_solib_by_pc (CORE_ADDR addr) |
| 741 | { |
| 742 | struct so_list *so_list = so_list_head; |
| 743 | CORE_ADDR retval = 0; |
| 744 | |
| 745 | while (so_list) |
| 746 | { |
| 747 | if (so_list->pa64_solib_desc.text_base <= addr |
| 748 | && ((so_list->pa64_solib_desc.text_base |
| 749 | + so_list->pa64_solib_desc.text_size) |
| 750 | > addr)) |
| 751 | { |
| 752 | retval = so_list->pa64_solib_desc_addr; |
| 753 | break; |
| 754 | } |
| 755 | so_list = so_list->next; |
| 756 | } |
| 757 | return retval; |
| 758 | } |
| 759 | |
| 760 | /* Dump information about all the currently loaded shared libraries. */ |
| 761 | |
| 762 | static void |
| 763 | pa64_sharedlibrary_info_command (char *ignore, int from_tty) |
| 764 | { |
| 765 | struct so_list *so_list = so_list_head; |
| 766 | |
| 767 | if (exec_bfd == NULL) |
| 768 | { |
| 769 | printf_unfiltered ("No executable file.\n"); |
| 770 | return; |
| 771 | } |
| 772 | |
| 773 | if (so_list == NULL) |
| 774 | { |
| 775 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
| 776 | return; |
| 777 | } |
| 778 | |
| 779 | printf_unfiltered ("Shared Object Libraries\n"); |
| 780 | printf_unfiltered (" %-19s%-19s%-19s%-19s\n", |
| 781 | " text start", " text end", |
| 782 | " data start", " data end"); |
| 783 | while (so_list) |
| 784 | { |
| 785 | unsigned int flags; |
| 786 | |
| 787 | printf_unfiltered ("%s", so_list->name); |
| 788 | if (so_list->objfile == NULL) |
| 789 | printf_unfiltered (" (symbols not loaded)"); |
| 790 | if (so_list->loaded == 0) |
| 791 | printf_unfiltered (" (shared library unloaded)"); |
| 792 | printf_unfiltered (" %-18s", |
| 793 | local_hex_string_custom (so_list->pa64_solib_desc.linkage_ptr, |
| 794 | "016l")); |
| 795 | printf_unfiltered ("\n"); |
| 796 | printf_unfiltered ("%-18s", |
| 797 | local_hex_string_custom (so_list->pa64_solib_desc.text_base, |
| 798 | "016l")); |
| 799 | printf_unfiltered (" %-18s", |
| 800 | local_hex_string_custom ((so_list->pa64_solib_desc.text_base |
| 801 | + so_list->pa64_solib_desc.text_size), |
| 802 | "016l")); |
| 803 | printf_unfiltered (" %-18s", |
| 804 | local_hex_string_custom (so_list->pa64_solib_desc.data_base, |
| 805 | "016l")); |
| 806 | printf_unfiltered (" %-18s\n", |
| 807 | local_hex_string_custom ((so_list->pa64_solib_desc.data_base |
| 808 | + so_list->pa64_solib_desc.data_size), |
| 809 | "016l")); |
| 810 | so_list = so_list->next; |
| 811 | } |
| 812 | } |
| 813 | |
| 814 | /* Load up one or more shared libraries as directed by the user. */ |
| 815 | |
| 816 | static void |
| 817 | pa64_solib_sharedlibrary_command (char *args, int from_tty) |
| 818 | { |
| 819 | dont_repeat (); |
| 820 | pa64_solib_add (args, from_tty, (struct target_ops *) 0); |
| 821 | } |
| 822 | |
| 823 | /* Return the name of the shared library containing ADDR or NULL if ADDR |
| 824 | is not contained in any known shared library. */ |
| 825 | |
| 826 | char * |
| 827 | pa64_solib_address (CORE_ADDR addr) |
| 828 | { |
| 829 | struct so_list *so = so_list_head; |
| 830 | |
| 831 | while (so) |
| 832 | { |
| 833 | /* Is this address within this shlib's text range? If so, |
| 834 | return the shlib's name. */ |
| 835 | if (addr >= so->pa64_solib_desc.text_base |
| 836 | && addr < (so->pa64_solib_desc.text_base |
| 837 | | so->pa64_solib_desc.text_size)) |
| 838 | return so->name; |
| 839 | |
| 840 | /* Nope, keep looking... */ |
| 841 | so = so->next; |
| 842 | } |
| 843 | |
| 844 | /* No, we couldn't prove that the address is within a shlib. */ |
| 845 | return NULL; |
| 846 | } |
| 847 | |
| 848 | /* We are killing the inferior and restarting the program. */ |
| 849 | |
| 850 | void |
| 851 | pa64_solib_restart (void) |
| 852 | { |
| 853 | struct so_list *sl = so_list_head; |
| 854 | |
| 855 | /* Before the shlib info vanishes, use it to disable any breakpoints |
| 856 | that may still be active in those shlibs. */ |
| 857 | disable_breakpoints_in_shlibs (0); |
| 858 | |
| 859 | /* Discard all the shlib descriptors. */ |
| 860 | while (sl) |
| 861 | { |
| 862 | struct so_list *next_sl = sl->next; |
| 863 | free (sl); |
| 864 | sl = next_sl; |
| 865 | } |
| 866 | so_list_head = NULL; |
| 867 | |
| 868 | pa64_solib_total_st_size = (LONGEST) 0; |
| 869 | pa64_solib_st_size_threshold_exceeded = 0; |
| 870 | |
| 871 | dld_cache.is_valid = 0; |
| 872 | dld_cache.have_read_dld_descriptor = 0; |
| 873 | dld_cache.dld_flags_addr = 0; |
| 874 | dld_cache.load_map = 0; |
| 875 | dld_cache.load_map_addr = 0; |
| 876 | dld_cache.dld_desc.data_base = 0; |
| 877 | dld_cache.dld_flags = 0; |
| 878 | dld_cache.dyninfo_sect = 0; |
| 879 | } |
| 880 | |
| 881 | void |
| 882 | _initialize_pa64_solib (void) |
| 883 | { |
| 884 | add_com ("sharedlibrary", class_files, pa64_solib_sharedlibrary_command, |
| 885 | "Load shared object library symbols for files matching REGEXP."); |
| 886 | add_info ("sharedlibrary", pa64_sharedlibrary_info_command, |
| 887 | "Status of loaded shared object libraries."); |
| 888 | add_show_from_set |
| 889 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, |
| 890 | (char *) &auto_solib_add, |
| 891 | "Set autoloading size threshold (in megabytes) of shared library symbols.\n\ |
| 892 | If nonzero, symbols from all shared object libraries will be loaded\n\ |
| 893 | automatically when the inferior begins execution or when the dynamic linker\n\ |
| 894 | informs gdb that a new library has been loaded, until the symbol table\n\ |
| 895 | of the program and libraries exceeds this threshold.\n\ |
| 896 | Otherwise, symbols must be loaded manually, using `sharedlibrary'.", |
| 897 | &setlist), |
| 898 | &showlist); |
| 899 | |
| 900 | /* ??rehrauer: On HP-UX, the kernel parameter MAXDSIZ limits how much |
| 901 | data space a process can use. We ought to be reading MAXDSIZ and |
| 902 | setting auto_solib_add to some large fraction of that value. If |
| 903 | not that, we maybe ought to be setting it smaller than the default |
| 904 | for MAXDSIZ (that being 64Mb, I believe). However, [1] this threshold |
| 905 | is only crudely approximated rather than actually measured, and [2] |
| 906 | 50 Mbytes is too small for debugging gdb itself. Thus, the arbitrary |
| 907 | 100 figure. |
| 908 | */ |
| 909 | auto_solib_add = 100; /* Megabytes */ |
| 910 | |
| 911 | pa64_solib_restart (); |
| 912 | } |
| 913 | |
| 914 | /* Get some HPUX-specific data from a shared lib. */ |
| 915 | CORE_ADDR |
| 916 | so_lib_thread_start_addr (struct so_list *so) |
| 917 | { |
| 918 | return so->pa64_solib_desc.tls_start_addr; |
| 919 | } |
| 920 | |
| 921 | /* Read the dynamic linker's internal shared library descriptor. |
| 922 | |
| 923 | This must happen after dld starts running, so we can't do it in |
| 924 | read_dynamic_info. Record the fact that we have loaded the |
| 925 | descriptor. If the library is archive bound, then return zero, else |
| 926 | return nonzero. */ |
| 927 | |
| 928 | static boolean |
| 929 | read_dld_descriptor (struct target_ops *target) |
| 930 | { |
| 931 | char *dll_path; |
| 932 | asection *dyninfo_sect; |
| 933 | |
| 934 | /* If necessary call read_dynamic_info to extract the contents of the |
| 935 | .dynamic section from the shared library. */ |
| 936 | if (!dld_cache.is_valid) |
| 937 | { |
| 938 | if (symfile_objfile == NULL) |
| 939 | error ("No object file symbols."); |
| 940 | |
| 941 | dyninfo_sect = bfd_get_section_by_name (symfile_objfile->obfd, |
| 942 | ".dynamic"); |
| 943 | if (!dyninfo_sect) |
| 944 | { |
| 945 | return 0; |
| 946 | } |
| 947 | |
| 948 | if (!read_dynamic_info (dyninfo_sect, &dld_cache)) |
| 949 | error ("Unable to read in .dynamic section information."); |
| 950 | } |
| 951 | |
| 952 | /* Read the load map pointer. */ |
| 953 | if (target_read_memory (dld_cache.load_map_addr, |
| 954 | (char*) &dld_cache.load_map, |
| 955 | sizeof(dld_cache.load_map)) |
| 956 | != 0) |
| 957 | { |
| 958 | error ("Error while reading in load map pointer."); |
| 959 | } |
| 960 | |
| 961 | /* Read in the dld load module descriptor */ |
| 962 | if (dlgetmodinfo (-1, |
| 963 | &dld_cache.dld_desc, |
| 964 | sizeof(dld_cache.dld_desc), |
| 965 | pa64_target_read_memory, |
| 966 | 0, |
| 967 | dld_cache.load_map) |
| 968 | == 0) |
| 969 | { |
| 970 | error ("Error trying to get information about dynamic linker."); |
| 971 | } |
| 972 | |
| 973 | /* Indicate that we have loaded the dld descriptor. */ |
| 974 | dld_cache.have_read_dld_descriptor = 1; |
| 975 | |
| 976 | /* Add dld.sl to the list of known shared libraries so that we can |
| 977 | do unwind, etc. |
| 978 | |
| 979 | ?!? This may not be correct. Consider of dld.sl contains symbols |
| 980 | which are also referenced/defined by the user program or some user |
| 981 | shared library. We need to make absolutely sure that we do not |
| 982 | pollute the namespace from GDB's point of view. */ |
| 983 | dll_path = dlgetname (&dld_cache.dld_desc, |
| 984 | sizeof(dld_cache.dld_desc), |
| 985 | pa64_target_read_memory, |
| 986 | 0, |
| 987 | dld_cache.load_map); |
| 988 | add_to_solist(0, dll_path, &dld_cache.dld_desc, 0, target); |
| 989 | |
| 990 | return 1; |
| 991 | } |
| 992 | |
| 993 | /* Read the .dynamic section and extract the information of interest, |
| 994 | which is stored in dld_cache. The routine elf_locate_base in solib.c |
| 995 | was used as a model for this. */ |
| 996 | |
| 997 | static boolean |
| 998 | read_dynamic_info (asection *dyninfo_sect, dld_cache_t *dld_cache_p) |
| 999 | { |
| 1000 | char *buf; |
| 1001 | char *bufend; |
| 1002 | CORE_ADDR dyninfo_addr; |
| 1003 | int dyninfo_sect_size; |
| 1004 | CORE_ADDR entry_addr; |
| 1005 | |
| 1006 | /* Read in .dynamic section, silently ignore errors. */ |
| 1007 | dyninfo_addr = bfd_section_vma (symfile_objfile->obfd, dyninfo_sect); |
| 1008 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); |
| 1009 | buf = alloca (dyninfo_sect_size); |
| 1010 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) |
| 1011 | return 0; |
| 1012 | |
| 1013 | /* Scan the .dynamic section and record the items of interest. |
| 1014 | In particular, DT_HP_DLD_FLAGS */ |
| 1015 | for (bufend = buf + dyninfo_sect_size, entry_addr = dyninfo_addr; |
| 1016 | buf < bufend; |
| 1017 | buf += sizeof (Elf64_Dyn), entry_addr += sizeof (Elf64_Dyn)) |
| 1018 | { |
| 1019 | Elf64_Dyn *x_dynp = (Elf64_Dyn*)buf; |
| 1020 | Elf64_Sxword dyn_tag; |
| 1021 | CORE_ADDR dyn_ptr; |
| 1022 | char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT]; |
| 1023 | |
| 1024 | dyn_tag = bfd_h_get_64 (symfile_objfile->obfd, |
| 1025 | (bfd_byte*) &x_dynp->d_tag); |
| 1026 | |
| 1027 | /* We can't use a switch here because dyn_tag is 64 bits and HP's |
| 1028 | lame comiler does not handle 64bit items in switch statements. */ |
| 1029 | if (dyn_tag == DT_NULL) |
| 1030 | break; |
| 1031 | else if (dyn_tag == DT_HP_DLD_FLAGS) |
| 1032 | { |
| 1033 | /* Set dld_flags_addr and dld_flags in *dld_cache_p */ |
| 1034 | dld_cache_p->dld_flags_addr = entry_addr + offsetof(Elf64_Dyn, d_un); |
| 1035 | if (target_read_memory (dld_cache_p->dld_flags_addr, |
| 1036 | (char*) &dld_cache_p->dld_flags, |
| 1037 | sizeof(dld_cache_p->dld_flags)) |
| 1038 | != 0) |
| 1039 | { |
| 1040 | error ("Error while reading in .dynamic section of the program."); |
| 1041 | } |
| 1042 | } |
| 1043 | else if (dyn_tag == DT_HP_LOAD_MAP) |
| 1044 | { |
| 1045 | /* Dld will place the address of the load map at load_map_addr |
| 1046 | after it starts running. */ |
| 1047 | if (target_read_memory (entry_addr + offsetof(Elf64_Dyn, |
| 1048 | d_un.d_ptr), |
| 1049 | (char*) &dld_cache_p->load_map_addr, |
| 1050 | sizeof(dld_cache_p->load_map_addr)) |
| 1051 | != 0) |
| 1052 | { |
| 1053 | error ("Error while reading in .dynamic section of the program."); |
| 1054 | } |
| 1055 | } |
| 1056 | else |
| 1057 | { |
| 1058 | /* tag is not of interest */ |
| 1059 | } |
| 1060 | } |
| 1061 | |
| 1062 | /* Record other information and set is_valid to 1. */ |
| 1063 | dld_cache_p->dyninfo_sect = dyninfo_sect; |
| 1064 | |
| 1065 | /* Verify that we read in required info. These fields are re-set to zero |
| 1066 | in pa64_solib_restart. */ |
| 1067 | |
| 1068 | if (dld_cache_p->dld_flags_addr != 0 && dld_cache_p->load_map_addr != 0) |
| 1069 | dld_cache_p->is_valid = 1; |
| 1070 | else |
| 1071 | return 0; |
| 1072 | |
| 1073 | return 1; |
| 1074 | } |
| 1075 | |
| 1076 | /* Wrapper for target_read_memory to make dlgetmodinfo happy. */ |
| 1077 | |
| 1078 | static void * |
| 1079 | pa64_target_read_memory (void *buffer, CORE_ADDR ptr, size_t bufsiz, int ident) |
| 1080 | { |
| 1081 | if (target_read_memory (ptr, buffer, bufsiz) != 0) |
| 1082 | return 0; |
| 1083 | return buffer; |
| 1084 | } |
| 1085 | |
| 1086 | /* Called from handle_dynlink_load_event and pa64_solib_add to add |
| 1087 | a shared library to so_list_head list and possibly to read in the |
| 1088 | debug information for the library. |
| 1089 | |
| 1090 | If load_module_desc_p is NULL, then the load module descriptor must |
| 1091 | be read from the inferior process at the address load_module_desc_addr. */ |
| 1092 | |
| 1093 | static void |
| 1094 | add_to_solist (boolean from_tty, char *dll_path, |
| 1095 | struct load_module_desc *load_module_desc_p, |
| 1096 | CORE_ADDR load_module_desc_addr, struct target_ops *target) |
| 1097 | { |
| 1098 | struct so_list *new_so, *so_list_tail; |
| 1099 | int pa64_solib_st_size_threshhold_exceeded; |
| 1100 | LONGEST st_size; |
| 1101 | |
| 1102 | if (symfile_objfile == NULL) |
| 1103 | return; |
| 1104 | |
| 1105 | so_list_tail = so_list_head; |
| 1106 | /* Find the end of the list of shared objects. */ |
| 1107 | while (so_list_tail && so_list_tail->next) |
| 1108 | { |
| 1109 | if (strcmp (so_list_tail->name, dll_path) == 0) |
| 1110 | return; |
| 1111 | so_list_tail = so_list_tail->next; |
| 1112 | } |
| 1113 | |
| 1114 | if (so_list_tail && strcmp (so_list_tail->name, dll_path) == 0) |
| 1115 | return; |
| 1116 | |
| 1117 | /* Add the shared library to the so_list_head list */ |
| 1118 | new_so = (struct so_list *) xmalloc (sizeof (struct so_list)); |
| 1119 | memset ((char *)new_so, 0, sizeof (struct so_list)); |
| 1120 | if (so_list_head == NULL) |
| 1121 | { |
| 1122 | so_list_head = new_so; |
| 1123 | so_list_tail = new_so; |
| 1124 | } |
| 1125 | else |
| 1126 | { |
| 1127 | so_list_tail->next = new_so; |
| 1128 | so_list_tail = new_so; |
| 1129 | } |
| 1130 | |
| 1131 | /* Initialize the new_so */ |
| 1132 | if (load_module_desc_p) |
| 1133 | { |
| 1134 | new_so->pa64_solib_desc = *load_module_desc_p; |
| 1135 | } |
| 1136 | else |
| 1137 | { |
| 1138 | if (target_read_memory (load_module_desc_addr, |
| 1139 | (char*) &new_so->pa64_solib_desc, |
| 1140 | sizeof(struct load_module_desc)) |
| 1141 | != 0) |
| 1142 | { |
| 1143 | error ("Error while reading in dynamic library %s", dll_path); |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | new_so->pa64_solib_desc_addr = load_module_desc_addr; |
| 1148 | new_so->loaded = 1; |
| 1149 | new_so->name = obsavestring (dll_path, strlen(dll_path), |
| 1150 | &symfile_objfile->symbol_obstack); |
| 1151 | |
| 1152 | /* If we are not going to load the library, tell the user if we |
| 1153 | haven't already and return. */ |
| 1154 | |
| 1155 | st_size = pa64_solib_sizeof_symbol_table (dll_path); |
| 1156 | pa64_solib_st_size_threshhold_exceeded = |
| 1157 | !from_tty |
| 1158 | && ( (st_size + pa64_solib_total_st_size) |
| 1159 | > (auto_solib_add * (LONGEST)1000000)); |
| 1160 | if (pa64_solib_st_size_threshhold_exceeded) |
| 1161 | { |
| 1162 | pa64_solib_add_solib_objfile (new_so, dll_path, from_tty, 1); |
| 1163 | return; |
| 1164 | } |
| 1165 | |
| 1166 | /* Now read in debug info. */ |
| 1167 | pa64_solib_total_st_size += st_size; |
| 1168 | |
| 1169 | /* This fills in new_so->objfile, among others. */ |
| 1170 | pa64_solib_load_symbols (new_so, |
| 1171 | dll_path, |
| 1172 | from_tty, |
| 1173 | 0); |
| 1174 | return; |
| 1175 | } |
| 1176 | |
| 1177 | |
| 1178 | /* |
| 1179 | LOCAL FUNCTION |
| 1180 | |
| 1181 | bfd_lookup_symbol -- lookup the value for a specific symbol |
| 1182 | |
| 1183 | SYNOPSIS |
| 1184 | |
| 1185 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) |
| 1186 | |
| 1187 | DESCRIPTION |
| 1188 | |
| 1189 | An expensive way to lookup the value of a single symbol for |
| 1190 | bfd's that are only temporary anyway. This is used by the |
| 1191 | shared library support to find the address of the debugger |
| 1192 | interface structures in the shared library. |
| 1193 | |
| 1194 | Note that 0 is specifically allowed as an error return (no |
| 1195 | such symbol). |
| 1196 | */ |
| 1197 | |
| 1198 | static CORE_ADDR |
| 1199 | bfd_lookup_symbol (bfd *abfd, char *symname) |
| 1200 | { |
| 1201 | unsigned int storage_needed; |
| 1202 | asymbol *sym; |
| 1203 | asymbol **symbol_table; |
| 1204 | unsigned int number_of_symbols; |
| 1205 | unsigned int i; |
| 1206 | struct cleanup *back_to; |
| 1207 | CORE_ADDR symaddr = 0; |
| 1208 | |
| 1209 | storage_needed = bfd_get_symtab_upper_bound (abfd); |
| 1210 | |
| 1211 | if (storage_needed > 0) |
| 1212 | { |
| 1213 | symbol_table = (asymbol **) xmalloc (storage_needed); |
| 1214 | back_to = make_cleanup (free, (PTR) symbol_table); |
| 1215 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
| 1216 | |
| 1217 | for (i = 0; i < number_of_symbols; i++) |
| 1218 | { |
| 1219 | sym = *symbol_table++; |
| 1220 | if (STREQ (sym->name, symname)) |
| 1221 | { |
| 1222 | /* Bfd symbols are section relative. */ |
| 1223 | symaddr = sym->value + sym->section->vma; |
| 1224 | break; |
| 1225 | } |
| 1226 | } |
| 1227 | do_cleanups (back_to); |
| 1228 | } |
| 1229 | return (symaddr); |
| 1230 | } |
| 1231 | |