| 1 | /* Core dump and executable file functions above target vector, for GDB. |
| 2 | Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "gdb_string.h" |
| 23 | #include <errno.h> |
| 24 | #include <signal.h> |
| 25 | #include <fcntl.h> |
| 26 | #include "frame.h" /* required by inferior.h */ |
| 27 | #include "inferior.h" |
| 28 | #include "symtab.h" |
| 29 | #include "command.h" |
| 30 | #include "gdbcmd.h" |
| 31 | #include "bfd.h" |
| 32 | #include "target.h" |
| 33 | #include "gdbcore.h" |
| 34 | #include "dis-asm.h" |
| 35 | #include "language.h" |
| 36 | #include "gdb_stat.h" |
| 37 | #include "symfile.h" |
| 38 | #include "objfiles.h" |
| 39 | |
| 40 | /* Local function declarations. */ |
| 41 | |
| 42 | extern void _initialize_core PARAMS ((void)); |
| 43 | static void call_extra_exec_file_hooks PARAMS ((char *filename)); |
| 44 | |
| 45 | /* You can have any number of hooks for `exec_file_command' command to call. |
| 46 | If there's only one hook, it is set in exec_file_display hook. |
| 47 | If there are two or more hooks, they are set in exec_file_extra_hooks[], |
| 48 | and exec_file_display_hook is set to a function that calls all of them. |
| 49 | This extra complexity is needed to preserve compatibility with |
| 50 | old code that assumed that only one hook could be set, and which called |
| 51 | exec_file_display_hook directly. */ |
| 52 | |
| 53 | typedef void (*hook_type) PARAMS ((char *)); |
| 54 | |
| 55 | hook_type exec_file_display_hook; /* the original hook */ |
| 56 | static hook_type *exec_file_extra_hooks; /* array of additional hooks */ |
| 57 | static int exec_file_hook_count = 0; /* size of array */ |
| 58 | |
| 59 | /* Binary file diddling handle for the core file. */ |
| 60 | |
| 61 | bfd *core_bfd = NULL; |
| 62 | |
| 63 | \f |
| 64 | /* Backward compatability with old way of specifying core files. */ |
| 65 | |
| 66 | void |
| 67 | core_file_command (filename, from_tty) |
| 68 | char *filename; |
| 69 | int from_tty; |
| 70 | { |
| 71 | struct target_ops *t; |
| 72 | |
| 73 | dont_repeat (); /* Either way, seems bogus. */ |
| 74 | |
| 75 | t = find_core_target (); |
| 76 | if (t != NULL) |
| 77 | if (!filename) |
| 78 | (t->to_detach) (filename, from_tty); |
| 79 | else |
| 80 | { |
| 81 | /* Yes, we were given the path of a core file. Do we already |
| 82 | have a symbol file? If not, can we determine it from the |
| 83 | core file? If we can, do so. |
| 84 | */ |
| 85 | #ifdef HPUXHPPA |
| 86 | if (symfile_objfile == NULL) |
| 87 | { |
| 88 | char * symfile; |
| 89 | symfile = t->to_core_file_to_sym_file (filename); |
| 90 | if (symfile) |
| 91 | { |
| 92 | char * symfile_copy = strdup (symfile); |
| 93 | |
| 94 | make_cleanup (free, symfile_copy); |
| 95 | symbol_file_command (symfile_copy, from_tty); |
| 96 | } |
| 97 | else |
| 98 | warning ("Unknown symbols for '%s'; use the 'symbol-file' command.", filename); |
| 99 | } |
| 100 | #endif |
| 101 | (t->to_open) (filename, from_tty); |
| 102 | } |
| 103 | else |
| 104 | error ("GDB can't read core files on this machine."); |
| 105 | } |
| 106 | |
| 107 | \f |
| 108 | /* If there are two or more functions that wish to hook into exec_file_command, |
| 109 | * this function will call all of the hook functions. */ |
| 110 | |
| 111 | static void |
| 112 | call_extra_exec_file_hooks (filename) |
| 113 | char *filename; |
| 114 | { |
| 115 | int i; |
| 116 | |
| 117 | for (i = 0; i < exec_file_hook_count; i++) |
| 118 | (*exec_file_extra_hooks[i])(filename); |
| 119 | } |
| 120 | |
| 121 | /* Call this to specify the hook for exec_file_command to call back. |
| 122 | This is called from the x-window display code. */ |
| 123 | |
| 124 | void |
| 125 | specify_exec_file_hook (hook) |
| 126 | void (*hook) PARAMS ((char *)); |
| 127 | { |
| 128 | hook_type *new_array; |
| 129 | |
| 130 | if (exec_file_display_hook != NULL) |
| 131 | { |
| 132 | /* There's already a hook installed. Arrange to have both it |
| 133 | * and the subsequent hooks called. */ |
| 134 | if (exec_file_hook_count == 0) |
| 135 | { |
| 136 | /* If this is the first extra hook, initialize the hook array. */ |
| 137 | exec_file_extra_hooks = (hook_type *) xmalloc (sizeof(hook_type)); |
| 138 | exec_file_extra_hooks[0] = exec_file_display_hook; |
| 139 | exec_file_display_hook = call_extra_exec_file_hooks; |
| 140 | exec_file_hook_count = 1; |
| 141 | } |
| 142 | |
| 143 | /* Grow the hook array by one and add the new hook to the end. |
| 144 | Yes, it's inefficient to grow it by one each time but since |
| 145 | this is hardly ever called it's not a big deal. */ |
| 146 | exec_file_hook_count++; |
| 147 | new_array = |
| 148 | (hook_type *) xrealloc (exec_file_extra_hooks, |
| 149 | exec_file_hook_count * sizeof(hook_type)); |
| 150 | exec_file_extra_hooks = new_array; |
| 151 | exec_file_extra_hooks[exec_file_hook_count - 1] = hook; |
| 152 | } |
| 153 | else |
| 154 | exec_file_display_hook = hook; |
| 155 | } |
| 156 | |
| 157 | /* The exec file must be closed before running an inferior. |
| 158 | If it is needed again after the inferior dies, it must |
| 159 | be reopened. */ |
| 160 | |
| 161 | void |
| 162 | close_exec_file () |
| 163 | { |
| 164 | #if 0 /* FIXME */ |
| 165 | if (exec_bfd) |
| 166 | bfd_tempclose (exec_bfd); |
| 167 | #endif |
| 168 | } |
| 169 | |
| 170 | void |
| 171 | reopen_exec_file () |
| 172 | { |
| 173 | #if 0 /* FIXME */ |
| 174 | if (exec_bfd) |
| 175 | bfd_reopen (exec_bfd); |
| 176 | #else |
| 177 | char *filename; |
| 178 | int res; |
| 179 | struct stat st; |
| 180 | long mtime; |
| 181 | |
| 182 | /* Don't do anything if the current target isn't exec. */ |
| 183 | if (exec_bfd == NULL || strcmp (target_shortname, "exec") != 0) |
| 184 | return; |
| 185 | |
| 186 | /* If the timestamp of the exec file has changed, reopen it. */ |
| 187 | filename = strdup (bfd_get_filename (exec_bfd)); |
| 188 | make_cleanup (free, filename); |
| 189 | mtime = bfd_get_mtime(exec_bfd); |
| 190 | res = stat (filename, &st); |
| 191 | |
| 192 | if (mtime && mtime != st.st_mtime) |
| 193 | exec_file_command (filename, 0); |
| 194 | #endif |
| 195 | } |
| 196 | \f |
| 197 | /* If we have both a core file and an exec file, |
| 198 | print a warning if they don't go together. */ |
| 199 | |
| 200 | void |
| 201 | validate_files () |
| 202 | { |
| 203 | if (exec_bfd && core_bfd) |
| 204 | { |
| 205 | if (!core_file_matches_executable_p (core_bfd, exec_bfd)) |
| 206 | warning ("core file may not match specified executable file."); |
| 207 | else if (bfd_get_mtime(exec_bfd) > bfd_get_mtime(core_bfd)) |
| 208 | warning ("exec file is newer than core file."); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /* Return the name of the executable file as a string. |
| 213 | ERR nonzero means get error if there is none specified; |
| 214 | otherwise return 0 in that case. */ |
| 215 | |
| 216 | char * |
| 217 | get_exec_file (err) |
| 218 | int err; |
| 219 | { |
| 220 | if (exec_bfd) return bfd_get_filename(exec_bfd); |
| 221 | if (!err) return NULL; |
| 222 | |
| 223 | error ("No executable file specified.\n\ |
| 224 | Use the \"file\" or \"exec-file\" command."); |
| 225 | return NULL; |
| 226 | } |
| 227 | |
| 228 | \f |
| 229 | /* Report a memory error with error(). */ |
| 230 | |
| 231 | void |
| 232 | memory_error (status, memaddr) |
| 233 | int status; |
| 234 | CORE_ADDR memaddr; |
| 235 | { |
| 236 | if (status == EIO) |
| 237 | { |
| 238 | /* Actually, address between memaddr and memaddr + len |
| 239 | was out of bounds. */ |
| 240 | error_begin (); |
| 241 | printf_filtered ("Cannot access memory at address "); |
| 242 | print_address_numeric (memaddr, 1, gdb_stdout); |
| 243 | printf_filtered (".\n"); |
| 244 | return_to_top_level (RETURN_ERROR); |
| 245 | } |
| 246 | else |
| 247 | { |
| 248 | error_begin (); |
| 249 | printf_filtered ("Error accessing memory address "); |
| 250 | print_address_numeric (memaddr, 1, gdb_stdout); |
| 251 | printf_filtered (": %s.\n", |
| 252 | safe_strerror (status)); |
| 253 | return_to_top_level (RETURN_ERROR); |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | /* Same as target_read_memory, but report an error if can't read. */ |
| 258 | void |
| 259 | read_memory (memaddr, myaddr, len) |
| 260 | CORE_ADDR memaddr; |
| 261 | char *myaddr; |
| 262 | int len; |
| 263 | { |
| 264 | int status; |
| 265 | status = target_read_memory (memaddr, myaddr, len); |
| 266 | if (status != 0) |
| 267 | memory_error (status, memaddr); |
| 268 | } |
| 269 | |
| 270 | void |
| 271 | read_memory_section (memaddr, myaddr, len, bfd_section) |
| 272 | CORE_ADDR memaddr; |
| 273 | char *myaddr; |
| 274 | int len; |
| 275 | asection *bfd_section; |
| 276 | { |
| 277 | int status; |
| 278 | status = target_read_memory_section (memaddr, myaddr, len, bfd_section); |
| 279 | if (status != 0) |
| 280 | memory_error (status, memaddr); |
| 281 | } |
| 282 | |
| 283 | /* Like target_read_memory, but slightly different parameters. */ |
| 284 | |
| 285 | int |
| 286 | dis_asm_read_memory (memaddr, myaddr, len, info) |
| 287 | bfd_vma memaddr; |
| 288 | bfd_byte *myaddr; |
| 289 | int len; |
| 290 | disassemble_info *info; |
| 291 | { |
| 292 | return target_read_memory (memaddr, (char *) myaddr, len); |
| 293 | } |
| 294 | |
| 295 | /* Like memory_error with slightly different parameters. */ |
| 296 | void |
| 297 | dis_asm_memory_error (status, memaddr, info) |
| 298 | int status; |
| 299 | bfd_vma memaddr; |
| 300 | disassemble_info *info; |
| 301 | { |
| 302 | memory_error (status, memaddr); |
| 303 | } |
| 304 | |
| 305 | /* Like print_address with slightly different parameters. */ |
| 306 | void |
| 307 | dis_asm_print_address (addr, info) |
| 308 | bfd_vma addr; |
| 309 | struct disassemble_info *info; |
| 310 | { |
| 311 | print_address (addr, info->stream); |
| 312 | } |
| 313 | |
| 314 | /* Same as target_write_memory, but report an error if can't write. */ |
| 315 | void |
| 316 | write_memory (memaddr, myaddr, len) |
| 317 | CORE_ADDR memaddr; |
| 318 | char *myaddr; |
| 319 | int len; |
| 320 | { |
| 321 | int status; |
| 322 | |
| 323 | status = target_write_memory (memaddr, myaddr, len); |
| 324 | if (status != 0) |
| 325 | memory_error (status, memaddr); |
| 326 | } |
| 327 | |
| 328 | /* Read an integer from debugged memory, given address and number of bytes. */ |
| 329 | |
| 330 | LONGEST |
| 331 | read_memory_integer (memaddr, len) |
| 332 | CORE_ADDR memaddr; |
| 333 | int len; |
| 334 | { |
| 335 | char buf[sizeof (LONGEST)]; |
| 336 | |
| 337 | read_memory (memaddr, buf, len); |
| 338 | return extract_signed_integer (buf, len); |
| 339 | } |
| 340 | |
| 341 | ULONGEST |
| 342 | read_memory_unsigned_integer (memaddr, len) |
| 343 | CORE_ADDR memaddr; |
| 344 | int len; |
| 345 | { |
| 346 | char buf[sizeof (ULONGEST)]; |
| 347 | |
| 348 | read_memory (memaddr, buf, len); |
| 349 | return extract_unsigned_integer (buf, len); |
| 350 | } |
| 351 | |
| 352 | void |
| 353 | read_memory_string (memaddr, buffer, max_len) |
| 354 | CORE_ADDR memaddr; |
| 355 | char * buffer; |
| 356 | int max_len; |
| 357 | { |
| 358 | register char * cp; |
| 359 | register int i; |
| 360 | int cnt; |
| 361 | |
| 362 | cp = buffer; |
| 363 | while (1) |
| 364 | { |
| 365 | if (cp - buffer >= max_len) |
| 366 | { |
| 367 | buffer[max_len - 1] = '\0'; |
| 368 | break; |
| 369 | } |
| 370 | cnt = max_len - (cp - buffer); |
| 371 | if (cnt > 8) |
| 372 | cnt = 8; |
| 373 | read_memory (memaddr + (int) (cp - buffer), cp, cnt); |
| 374 | for (i = 0; i < cnt && *cp; i++, cp++) |
| 375 | ; /* null body */ |
| 376 | |
| 377 | if (i < cnt && !*cp) |
| 378 | break; |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | \f |
| 383 | #if 0 |
| 384 | /* Enable after 4.12. It is not tested. */ |
| 385 | |
| 386 | /* Search code. Targets can just make this their search function, or |
| 387 | if the protocol has a less general search function, they can call this |
| 388 | in the cases it can't handle. */ |
| 389 | void |
| 390 | generic_search (len, data, mask, startaddr, increment, lorange, hirange |
| 391 | addr_found, data_found) |
| 392 | int len; |
| 393 | char *data; |
| 394 | char *mask; |
| 395 | CORE_ADDR startaddr; |
| 396 | int increment; |
| 397 | CORE_ADDR lorange; |
| 398 | CORE_ADDR hirange; |
| 399 | CORE_ADDR *addr_found; |
| 400 | char *data_found; |
| 401 | { |
| 402 | int i; |
| 403 | CORE_ADDR curaddr = startaddr; |
| 404 | |
| 405 | while (curaddr >= lorange && curaddr < hirange) |
| 406 | { |
| 407 | read_memory (curaddr, data_found, len); |
| 408 | for (i = 0; i < len; ++i) |
| 409 | if ((data_found[i] & mask[i]) != data[i]) |
| 410 | goto try_again; |
| 411 | /* It matches. */ |
| 412 | *addr_found = curaddr; |
| 413 | return; |
| 414 | |
| 415 | try_again: |
| 416 | curaddr += increment; |
| 417 | } |
| 418 | *addr_found = (CORE_ADDR)0; |
| 419 | return; |
| 420 | } |
| 421 | #endif /* 0 */ |
| 422 | \f |
| 423 | /* The current default bfd target. Points to storage allocated for |
| 424 | gnutarget_string. */ |
| 425 | char *gnutarget; |
| 426 | |
| 427 | /* Same thing, except it is "auto" not NULL for the default case. */ |
| 428 | static char *gnutarget_string; |
| 429 | |
| 430 | static void set_gnutarget_command |
| 431 | PARAMS ((char *, int, struct cmd_list_element *)); |
| 432 | |
| 433 | static void |
| 434 | set_gnutarget_command (ignore, from_tty, c) |
| 435 | char *ignore; |
| 436 | int from_tty; |
| 437 | struct cmd_list_element *c; |
| 438 | { |
| 439 | if (STREQ (gnutarget_string, "auto")) |
| 440 | gnutarget = NULL; |
| 441 | else |
| 442 | gnutarget = gnutarget_string; |
| 443 | } |
| 444 | |
| 445 | /* Set the gnutarget. */ |
| 446 | void |
| 447 | set_gnutarget (newtarget) |
| 448 | char *newtarget; |
| 449 | { |
| 450 | if (gnutarget_string != NULL) |
| 451 | free (gnutarget_string); |
| 452 | gnutarget_string = savestring (newtarget, strlen (newtarget)); |
| 453 | set_gnutarget_command (NULL, 0, NULL); |
| 454 | } |
| 455 | |
| 456 | void |
| 457 | _initialize_core() |
| 458 | { |
| 459 | struct cmd_list_element *c; |
| 460 | c = add_cmd ("core-file", class_files, core_file_command, |
| 461 | "Use FILE as core dump for examining memory and registers.\n\ |
| 462 | No arg means have no core file. This command has been superseded by the\n\ |
| 463 | `target core' and `detach' commands.", &cmdlist); |
| 464 | c->completer = filename_completer; |
| 465 | |
| 466 | c = add_set_cmd ("gnutarget", class_files, var_string_noescape, |
| 467 | (char *) &gnutarget_string, |
| 468 | "Set the current BFD target.\n\ |
| 469 | Use `set gnutarget auto' to specify automatic detection.", |
| 470 | &setlist); |
| 471 | c->function.sfunc = set_gnutarget_command; |
| 472 | add_show_from_set (c, &showlist); |
| 473 | |
| 474 | if (getenv ("GNUTARGET")) |
| 475 | set_gnutarget (getenv ("GNUTARGET")); |
| 476 | else |
| 477 | set_gnutarget ("auto"); |
| 478 | } |