1/* Core dump and executable file functions above target vector, for GDB. 2 3 Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1996, 1997, 1998, 4 1999, 2000, 2001, 2003, 2006, 2007 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21#include "defs.h" 22#include "gdb_string.h" 23#include <errno.h> 24#include <signal.h> 25#include <fcntl.h> 26#include "inferior.h" 27#include "symtab.h" 28#include "command.h" 29#include "gdbcmd.h" 30#include "bfd.h" 31#include "target.h" 32#include "gdbcore.h" 33#include "dis-asm.h" 34#include "gdb_stat.h" 35#include "completer.h" 36#include "exceptions.h" 37 38/* Local function declarations. */ 39 40extern void _initialize_core (void); 41static void call_extra_exec_file_hooks (char *filename); 42 43/* You can have any number of hooks for `exec_file_command' command to 44 call. If there's only one hook, it is set in exec_file_display 45 hook. If there are two or more hooks, they are set in 46 exec_file_extra_hooks[], and deprecated_exec_file_display_hook is 47 set to a function that calls all of them. This extra complexity is 48 needed to preserve compatibility with old code that assumed that 49 only one hook could be set, and which called 50 deprecated_exec_file_display_hook directly. */ 51 52typedef void (*hook_type) (char *); 53 54hook_type deprecated_exec_file_display_hook; /* the original hook */ 55static hook_type *exec_file_extra_hooks; /* array of additional hooks */ 56static int exec_file_hook_count = 0; /* size of array */ 57 58/* Binary file diddling handle for the core file. */ 59 60bfd *core_bfd = NULL; 61 62 63/* Backward compatability with old way of specifying core files. */ 64 65void 66core_file_command (char *filename, int from_tty) 67{ 68 struct target_ops *t; 69 70 dont_repeat (); /* Either way, seems bogus. */ 71 72 t = find_core_target (); 73 if (t == NULL) 74 error (_("GDB can't read core files on this machine.")); 75 76 if (!filename) 77 (t->to_detach) (filename, from_tty); 78 else 79 (t->to_open) (filename, from_tty); 80} 81 82 83/* If there are two or more functions that wish to hook into 84 exec_file_command, this function will call all of the hook 85 functions. */ 86 87static void 88call_extra_exec_file_hooks (char *filename) 89{ 90 int i; 91 92 for (i = 0; i < exec_file_hook_count; i++) 93 (*exec_file_extra_hooks[i]) (filename); 94} 95 96/* Call this to specify the hook for exec_file_command to call back. 97 This is called from the x-window display code. */ 98 99void 100specify_exec_file_hook (void (*hook) (char *)) 101{ 102 hook_type *new_array; 103 104 if (deprecated_exec_file_display_hook != NULL) 105 { 106 /* There's already a hook installed. Arrange to have both it 107 * and the subsequent hooks called. */ 108 if (exec_file_hook_count == 0) 109 { 110 /* If this is the first extra hook, initialize the hook array. */ 111 exec_file_extra_hooks = (hook_type *) xmalloc (sizeof (hook_type)); 112 exec_file_extra_hooks[0] = deprecated_exec_file_display_hook; 113 deprecated_exec_file_display_hook = call_extra_exec_file_hooks; 114 exec_file_hook_count = 1; 115 } 116 117 /* Grow the hook array by one and add the new hook to the end. 118 Yes, it's inefficient to grow it by one each time but since 119 this is hardly ever called it's not a big deal. */ 120 exec_file_hook_count++; 121 new_array = 122 (hook_type *) xrealloc (exec_file_extra_hooks, 123 exec_file_hook_count * sizeof (hook_type)); 124 exec_file_extra_hooks = new_array; 125 exec_file_extra_hooks[exec_file_hook_count - 1] = hook; 126 } 127 else 128 deprecated_exec_file_display_hook = hook; 129} 130 131/* The exec file must be closed before running an inferior. 132 If it is needed again after the inferior dies, it must 133 be reopened. */ 134 135void 136close_exec_file (void) 137{ 138#if 0 /* FIXME */ 139 if (exec_bfd) 140 bfd_tempclose (exec_bfd); 141#endif 142} 143 144void 145reopen_exec_file (void) 146{ 147#if 0 /* FIXME */ 148 if (exec_bfd) 149 bfd_reopen (exec_bfd); 150#else 151 char *filename; 152 int res; 153 struct stat st; 154 long mtime; 155 156 /* Don't do anything if there isn't an exec file. */ 157 if (exec_bfd == NULL) 158 return; 159 160 /* If the timestamp of the exec file has changed, reopen it. */ 161 filename = xstrdup (bfd_get_filename (exec_bfd)); 162 make_cleanup (xfree, filename); 163 mtime = bfd_get_mtime (exec_bfd); 164 res = stat (filename, &st); 165 166 if (mtime && mtime != st.st_mtime) 167 exec_file_attach (filename, 0); 168#endif 169} 170 171/* If we have both a core file and an exec file, 172 print a warning if they don't go together. */ 173 174void 175validate_files (void) 176{ 177 if (exec_bfd && core_bfd) 178 { 179 if (!core_file_matches_executable_p (core_bfd, exec_bfd)) 180 warning (_("core file may not match specified executable file.")); 181 else if (bfd_get_mtime (exec_bfd) > bfd_get_mtime (core_bfd)) 182 warning (_("exec file is newer than core file.")); 183 } 184} 185 186/* Return the name of the executable file as a string. 187 ERR nonzero means get error if there is none specified; 188 otherwise return 0 in that case. */ 189 190char * 191get_exec_file (int err) 192{ 193 if (exec_bfd) 194 return bfd_get_filename (exec_bfd); 195 if (!err) 196 return NULL; 197 198 error (_("No executable file specified.\n\ 199Use the \"file\" or \"exec-file\" command.")); 200 return NULL; 201} 202 203 204/* Report a memory error with error(). */ 205 206void 207memory_error (int status, CORE_ADDR memaddr) 208{ 209 struct ui_file *tmp_stream = mem_fileopen (); 210 make_cleanup_ui_file_delete (tmp_stream); 211 212 if (status == EIO) 213 { 214 /* Actually, address between memaddr and memaddr + len 215 was out of bounds. */ 216 fprintf_unfiltered (tmp_stream, "Cannot access memory at address "); 217 deprecated_print_address_numeric (memaddr, 1, tmp_stream); 218 } 219 else 220 { 221 fprintf_filtered (tmp_stream, "Error accessing memory address "); 222 deprecated_print_address_numeric (memaddr, 1, tmp_stream); 223 fprintf_filtered (tmp_stream, ": %s.", 224 safe_strerror (status)); 225 } 226 227 error_stream (tmp_stream); 228} 229 230/* Same as target_read_memory, but report an error if can't read. */ 231void 232read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len) 233{ 234 int status; 235 status = target_read_memory (memaddr, myaddr, len); 236 if (status != 0) 237 memory_error (status, memaddr); 238} 239 240/* Argument / return result struct for use with 241 do_captured_read_memory_integer(). MEMADDR and LEN are filled in 242 by gdb_read_memory_integer(). RESULT is the contents that were 243 successfully read from MEMADDR of length LEN. */ 244 245struct captured_read_memory_integer_arguments 246{ 247 CORE_ADDR memaddr; 248 int len; 249 LONGEST result; 250}; 251 252/* Helper function for gdb_read_memory_integer(). DATA must be a 253 pointer to a captured_read_memory_integer_arguments struct. 254 Return 1 if successful. Note that the catch_errors() interface 255 will return 0 if an error occurred while reading memory. This 256 choice of return code is so that we can distinguish between 257 success and failure. */ 258 259static int 260do_captured_read_memory_integer (void *data) 261{ 262 struct captured_read_memory_integer_arguments *args = (struct captured_read_memory_integer_arguments*) data; 263 CORE_ADDR memaddr = args->memaddr; 264 int len = args->len; 265 266 args->result = read_memory_integer (memaddr, len); 267 268 return 1; 269} 270 271/* Read memory at MEMADDR of length LEN and put the contents in 272 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero 273 if successful. */ 274 275int 276safe_read_memory_integer (CORE_ADDR memaddr, int len, LONGEST *return_value) 277{ 278 int status; 279 struct captured_read_memory_integer_arguments args; 280 args.memaddr = memaddr; 281 args.len = len; 282 283 status = catch_errors (do_captured_read_memory_integer, &args, 284 "", RETURN_MASK_ALL); 285 if (status) 286 *return_value = args.result; 287 288 return status; 289} 290 291LONGEST 292read_memory_integer (CORE_ADDR memaddr, int len) 293{ 294 gdb_byte buf[sizeof (LONGEST)]; 295 296 read_memory (memaddr, buf, len); 297 return extract_signed_integer (buf, len); 298} 299 300ULONGEST 301read_memory_unsigned_integer (CORE_ADDR memaddr, int len) 302{ 303 gdb_byte buf[sizeof (ULONGEST)]; 304 305 read_memory (memaddr, buf, len); 306 return extract_unsigned_integer (buf, len); 307} 308 309void 310read_memory_string (CORE_ADDR memaddr, char *buffer, int max_len) 311{ 312 char *cp; 313 int i; 314 int cnt; 315 316 cp = buffer; 317 while (1) 318 { 319 if (cp - buffer >= max_len) 320 { 321 buffer[max_len - 1] = '\0'; 322 break; 323 } 324 cnt = max_len - (cp - buffer); 325 if (cnt > 8) 326 cnt = 8; 327 read_memory (memaddr + (int) (cp - buffer), cp, cnt); 328 for (i = 0; i < cnt && *cp; i++, cp++) 329 ; /* null body */ 330 331 if (i < cnt && !*cp) 332 break; 333 } 334} 335 336CORE_ADDR 337read_memory_typed_address (CORE_ADDR addr, struct type *type) 338{ 339 gdb_byte *buf = alloca (TYPE_LENGTH (type)); 340 read_memory (addr, buf, TYPE_LENGTH (type)); 341 return extract_typed_address (buf, type); 342} 343 344/* Same as target_write_memory, but report an error if can't write. */ 345void 346write_memory (CORE_ADDR memaddr, const bfd_byte *myaddr, int len) 347{ 348 int status; 349 gdb_byte *bytes = alloca (len); 350 351 memcpy (bytes, myaddr, len); 352 status = target_write_memory (memaddr, bytes, len); 353 if (status != 0) 354 memory_error (status, memaddr); 355} 356 357/* Store VALUE at ADDR in the inferior as a LEN-byte unsigned integer. */ 358void 359write_memory_unsigned_integer (CORE_ADDR addr, int len, ULONGEST value) 360{ 361 gdb_byte *buf = alloca (len); 362 store_unsigned_integer (buf, len, value); 363 write_memory (addr, buf, len); 364} 365 366/* Store VALUE at ADDR in the inferior as a LEN-byte signed integer. */ 367void 368write_memory_signed_integer (CORE_ADDR addr, int len, LONGEST value) 369{ 370 gdb_byte *buf = alloca (len); 371 store_signed_integer (buf, len, value); 372 write_memory (addr, buf, len); 373} 374 375 376 377#if 0 378/* Enable after 4.12. It is not tested. */ 379 380/* Search code. Targets can just make this their search function, or 381 if the protocol has a less general search function, they can call this 382 in the cases it can't handle. */ 383void 384generic_search (int len, char *data, char *mask, CORE_ADDR startaddr, 385 int increment, CORE_ADDR lorange, CORE_ADDR hirange, 386 CORE_ADDR *addr_found, char *data_found) 387{ 388 int i; 389 CORE_ADDR curaddr = startaddr; 390 391 while (curaddr >= lorange && curaddr < hirange) 392 { 393 read_memory (curaddr, data_found, len); 394 for (i = 0; i < len; ++i) 395 if ((data_found[i] & mask[i]) != data[i]) 396 goto try_again; 397 /* It matches. */ 398 *addr_found = curaddr; 399 return; 400 401 try_again: 402 curaddr += increment; 403 } 404 *addr_found = (CORE_ADDR) 0; 405 return; 406} 407#endif /* 0 */ 408 409/* The current default bfd target. Points to storage allocated for 410 gnutarget_string. */ 411char *gnutarget; 412 413/* Same thing, except it is "auto" not NULL for the default case. */ 414static char *gnutarget_string; 415static void 416show_gnutarget_string (struct ui_file *file, int from_tty, 417 struct cmd_list_element *c, const char *value) 418{ 419 fprintf_filtered (file, _("The current BFD target is \"%s\".\n"), value); 420} 421 422static void set_gnutarget_command (char *, int, struct cmd_list_element *); 423 424static void 425set_gnutarget_command (char *ignore, int from_tty, struct cmd_list_element *c) 426{ 427 if (strcmp (gnutarget_string, "auto") == 0) 428 gnutarget = NULL; 429 else 430 gnutarget = gnutarget_string; 431} 432 433/* Set the gnutarget. */ 434void 435set_gnutarget (char *newtarget) 436{ 437 if (gnutarget_string != NULL) 438 xfree (gnutarget_string); 439 gnutarget_string = savestring (newtarget, strlen (newtarget)); 440 set_gnutarget_command (NULL, 0, NULL); 441} 442 443void 444_initialize_core (void) 445{ 446 struct cmd_list_element *c; 447 c = add_cmd ("core-file", class_files, core_file_command, _("\ 448Use FILE as core dump for examining memory and registers.\n\ 449No arg means have no core file. This command has been superseded by the\n\ 450`target core' and `detach' commands."), &cmdlist); 451 set_cmd_completer (c, filename_completer); 452 453 454 add_setshow_string_noescape_cmd ("gnutarget", class_files, 455 &gnutarget_string, _("(\ 456Set the current BFD target."), _("\ 457Show the current BFD target."), _("\ 458Use `set gnutarget auto' to specify automatic detection."), 459 set_gnutarget_command, 460 show_gnutarget_string, 461 &setlist, &showlist); 462 463 if (getenv ("GNUTARGET")) 464 set_gnutarget (getenv ("GNUTARGET")); 465 else 466 set_gnutarget ("auto"); 467} 468