1/* Work with executable files, for GDB. 2 3 Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 4 1998, 1999, 2000, 2001, 2002, 2003, 2007, 2008, 2009, 2010, 2011 5 Free Software Foundation, Inc. 6 7 This file is part of GDB. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 21 22#include "defs.h" 23#include "frame.h" 24#include "inferior.h" 25#include "target.h" 26#include "gdbcmd.h" 27#include "language.h" 28#include "filenames.h" 29#include "symfile.h" 30#include "objfiles.h" 31#include "completer.h" 32#include "value.h" 33#include "exec.h" 34#include "observer.h" 35#include "arch-utils.h" 36#include "gdbthread.h" 37#include "progspace.h" 38 39#include <fcntl.h> 40#include "readline/readline.h" 41#include "gdb_string.h" 42 43#include "gdbcore.h" 44 45#include <ctype.h> 46#include "gdb_stat.h" 47 48#include "xcoffsolib.h" 49 50struct vmap *map_vmap (bfd *, bfd *); 51 52void (*deprecated_file_changed_hook) (char *); 53 54/* Prototypes for local functions */ 55 56static void file_command (char *, int); 57 58static void set_section_command (char *, int); 59 60static void exec_files_info (struct target_ops *); 61 62static void init_exec_ops (void); 63 64void _initialize_exec (void); 65 66/* The target vector for executable files. */ 67 68struct target_ops exec_ops; 69 70/* True if the exec target is pushed on the stack. */ 71static int using_exec_ops; 72 73/* Whether to open exec and core files read-only or read-write. */ 74 75int write_files = 0; 76static void 77show_write_files (struct ui_file *file, int from_tty, 78 struct cmd_list_element *c, const char *value) 79{ 80 fprintf_filtered (file, _("Writing into executable and core files is %s.\n"), 81 value); 82} 83 84 85struct vmap *vmap; 86 87static void 88exec_open (char *args, int from_tty) 89{ 90 target_preopen (from_tty); 91 exec_file_attach (args, from_tty); 92} 93 94/* Close and clear exec_bfd. If we end up with no target sections to 95 read memory from, this unpushes the exec_ops target. */ 96 97void 98exec_close (void) 99{ 100 if (exec_bfd) 101 { 102 bfd *abfd = exec_bfd; 103 char *name = bfd_get_filename (abfd); 104 105 gdb_bfd_close_or_warn (abfd); 106 xfree (name); 107 108 /* Removing target sections may close the exec_ops target. 109 Clear exec_bfd before doing so to prevent recursion. */ 110 exec_bfd = NULL; 111 exec_bfd_mtime = 0; 112 113 remove_target_sections (abfd); 114 } 115} 116 117/* This is the target_close implementation. Clears all target 118 sections and closes all executable bfds from all program spaces. */ 119 120static void 121exec_close_1 (int quitting) 122{ 123 int need_symtab_cleanup = 0; 124 struct vmap *vp, *nxt; 125 126 using_exec_ops = 0; 127 128 for (nxt = vmap; nxt != NULL;) 129 { 130 vp = nxt; 131 nxt = vp->nxt; 132 133 /* if there is an objfile associated with this bfd, 134 free_objfile() will do proper cleanup of objfile *and* bfd. */ 135 136 if (vp->objfile) 137 { 138 free_objfile (vp->objfile); 139 need_symtab_cleanup = 1; 140 } 141 else if (vp->bfd != exec_bfd) 142 /* FIXME-leak: We should be freeing vp->name too, I think. */ 143 gdb_bfd_close_or_warn (vp->bfd); 144 145 xfree (vp); 146 } 147 148 vmap = NULL; 149 150 { 151 struct program_space *ss; 152 struct cleanup *old_chain; 153 154 old_chain = save_current_program_space (); 155 ALL_PSPACES (ss) 156 { 157 set_current_program_space (ss); 158 159 /* Delete all target sections. */ 160 resize_section_table 161 (current_target_sections, 162 -resize_section_table (current_target_sections, 0)); 163 164 exec_close (); 165 } 166 167 do_cleanups (old_chain); 168 } 169} 170 171void 172exec_file_clear (int from_tty) 173{ 174 /* Remove exec file. */ 175 exec_close (); 176 177 if (from_tty) 178 printf_unfiltered (_("No executable file now.\n")); 179} 180 181/* Set FILENAME as the new exec file. 182 183 This function is intended to be behave essentially the same 184 as exec_file_command, except that the latter will detect when 185 a target is being debugged, and will ask the user whether it 186 should be shut down first. (If the answer is "no", then the 187 new file is ignored.) 188 189 This file is used by exec_file_command, to do the work of opening 190 and processing the exec file after any prompting has happened. 191 192 And, it is used by child_attach, when the attach command was 193 given a pid but not a exec pathname, and the attach command could 194 figure out the pathname from the pid. (In this case, we shouldn't 195 ask the user whether the current target should be shut down -- 196 we're supplying the exec pathname late for good reason.) */ 197 198void 199exec_file_attach (char *filename, int from_tty) 200{ 201 /* Remove any previous exec file. */ 202 exec_close (); 203 204 /* Now open and digest the file the user requested, if any. */ 205 206 if (!filename) 207 { 208 if (from_tty) 209 printf_unfiltered (_("No executable file now.\n")); 210 211 set_gdbarch_from_file (NULL); 212 } 213 else 214 { 215 struct cleanup *cleanups; 216 char *scratch_pathname; 217 int scratch_chan; 218 struct target_section *sections = NULL, *sections_end = NULL; 219 char **matching; 220 221 scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, filename, 222 write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY, 223 &scratch_pathname); 224#if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__) 225 if (scratch_chan < 0) 226 { 227 char *exename = alloca (strlen (filename) + 5); 228 229 strcat (strcpy (exename, filename), ".exe"); 230 scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, exename, 231 write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY, 232 &scratch_pathname); 233 } 234#endif 235 if (scratch_chan < 0) 236 perror_with_name (filename); 237 exec_bfd = bfd_fopen (scratch_pathname, gnutarget, 238 write_files ? FOPEN_RUB : FOPEN_RB, 239 scratch_chan); 240 241 if (!exec_bfd) 242 { 243 close (scratch_chan); 244 error (_("\"%s\": could not open as an executable file: %s"), 245 scratch_pathname, bfd_errmsg (bfd_get_error ())); 246 } 247 248 /* At this point, scratch_pathname and exec_bfd->name both point to the 249 same malloc'd string. However exec_close() will attempt to free it 250 via the exec_bfd->name pointer, so we need to make another copy and 251 leave exec_bfd as the new owner of the original copy. */ 252 scratch_pathname = xstrdup (scratch_pathname); 253 cleanups = make_cleanup (xfree, scratch_pathname); 254 255 if (!bfd_check_format_matches (exec_bfd, bfd_object, &matching)) 256 { 257 /* Make sure to close exec_bfd, or else "run" might try to use 258 it. */ 259 exec_close (); 260 error (_("\"%s\": not in executable format: %s"), 261 scratch_pathname, 262 gdb_bfd_errmsg (bfd_get_error (), matching)); 263 } 264 265 /* FIXME - This should only be run for RS6000, but the ifdef is a poor 266 way to accomplish. */ 267#ifdef DEPRECATED_IBM6000_TARGET 268 /* Setup initial vmap. */ 269 270 map_vmap (exec_bfd, 0); 271 if (vmap == NULL) 272 { 273 /* Make sure to close exec_bfd, or else "run" might try to use 274 it. */ 275 exec_close (); 276 error (_("\"%s\": can't find the file sections: %s"), 277 scratch_pathname, bfd_errmsg (bfd_get_error ())); 278 } 279#endif /* DEPRECATED_IBM6000_TARGET */ 280 281 if (build_section_table (exec_bfd, §ions, §ions_end)) 282 { 283 /* Make sure to close exec_bfd, or else "run" might try to use 284 it. */ 285 exec_close (); 286 error (_("\"%s\": can't find the file sections: %s"), 287 scratch_pathname, bfd_errmsg (bfd_get_error ())); 288 } 289 290 exec_bfd_mtime = bfd_get_mtime (exec_bfd); 291 292 validate_files (); 293 294 set_gdbarch_from_file (exec_bfd); 295 296 /* Add the executable's sections to the current address spaces' 297 list of sections. This possibly pushes the exec_ops 298 target. */ 299 add_target_sections (sections, sections_end); 300 xfree (sections); 301 302 /* Tell display code (if any) about the changed file name. */ 303 if (deprecated_exec_file_display_hook) 304 (*deprecated_exec_file_display_hook) (filename); 305 306 do_cleanups (cleanups); 307 } 308 bfd_cache_close_all (); 309 observer_notify_executable_changed (); 310} 311 312/* Process the first arg in ARGS as the new exec file. 313 314 Note that we have to explicitly ignore additional args, since we can 315 be called from file_command(), which also calls symbol_file_command() 316 which can take multiple args. 317 318 If ARGS is NULL, we just want to close the exec file. */ 319 320static void 321exec_file_command (char *args, int from_tty) 322{ 323 char **argv; 324 char *filename; 325 326 if (from_tty && target_has_execution 327 && !query (_("A program is being debugged already.\n" 328 "Are you sure you want to change the file? "))) 329 error (_("File not changed.")); 330 331 if (args) 332 { 333 struct cleanup *cleanups; 334 335 /* Scan through the args and pick up the first non option arg 336 as the filename. */ 337 338 argv = gdb_buildargv (args); 339 cleanups = make_cleanup_freeargv (argv); 340 341 for (; (*argv != NULL) && (**argv == '-'); argv++) 342 {; 343 } 344 if (*argv == NULL) 345 error (_("No executable file name was specified")); 346 347 filename = tilde_expand (*argv); 348 make_cleanup (xfree, filename); 349 exec_file_attach (filename, from_tty); 350 351 do_cleanups (cleanups); 352 } 353 else 354 exec_file_attach (NULL, from_tty); 355} 356 357/* Set both the exec file and the symbol file, in one command. 358 What a novelty. Why did GDB go through four major releases before this 359 command was added? */ 360 361static void 362file_command (char *arg, int from_tty) 363{ 364 /* FIXME, if we lose on reading the symbol file, we should revert 365 the exec file, but that's rough. */ 366 exec_file_command (arg, from_tty); 367 symbol_file_command (arg, from_tty); 368 if (deprecated_file_changed_hook) 369 deprecated_file_changed_hook (arg); 370} 371 372 373/* Locate all mappable sections of a BFD file. 374 table_pp_char is a char * to get it through bfd_map_over_sections; 375 we cast it back to its proper type. */ 376 377static void 378add_to_section_table (bfd *abfd, struct bfd_section *asect, 379 void *table_pp_char) 380{ 381 struct target_section **table_pp = (struct target_section **) table_pp_char; 382 flagword aflag; 383 384 /* Check the section flags, but do not discard zero-length sections, since 385 some symbols may still be attached to this section. For instance, we 386 encountered on sparc-solaris 2.10 a shared library with an empty .bss 387 section to which a symbol named "_end" was attached. The address 388 of this symbol still needs to be relocated. */ 389 aflag = bfd_get_section_flags (abfd, asect); 390 if (!(aflag & SEC_ALLOC)) 391 return; 392 393 (*table_pp)->bfd = abfd; 394 (*table_pp)->the_bfd_section = asect; 395 (*table_pp)->addr = bfd_section_vma (abfd, asect); 396 (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect); 397 (*table_pp)++; 398} 399 400int 401resize_section_table (struct target_section_table *table, int num_added) 402{ 403 struct target_section *old_value; 404 int old_count; 405 int new_count; 406 407 old_value = table->sections; 408 old_count = table->sections_end - table->sections; 409 410 new_count = num_added + old_count; 411 412 if (new_count) 413 { 414 table->sections = xrealloc (table->sections, 415 sizeof (struct target_section) * new_count); 416 table->sections_end = table->sections + new_count; 417 } 418 else 419 { 420 xfree (table->sections); 421 table->sections = table->sections_end = NULL; 422 } 423 424 return old_count; 425} 426 427/* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR. 428 Returns 0 if OK, 1 on error. */ 429 430int 431build_section_table (struct bfd *some_bfd, struct target_section **start, 432 struct target_section **end) 433{ 434 unsigned count; 435 436 count = bfd_count_sections (some_bfd); 437 if (*start) 438 xfree (* start); 439 *start = (struct target_section *) xmalloc (count * sizeof (**start)); 440 *end = *start; 441 bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end); 442 if (*end > *start + count) 443 internal_error (__FILE__, __LINE__, 444 _("failed internal consistency check")); 445 /* We could realloc the table, but it probably loses for most files. */ 446 return 0; 447} 448 449/* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the 450 current set of target sections. */ 451 452void 453add_target_sections (struct target_section *sections, 454 struct target_section *sections_end) 455{ 456 int count; 457 struct target_section_table *table = current_target_sections; 458 459 count = sections_end - sections; 460 461 if (count > 0) 462 { 463 int space = resize_section_table (table, count); 464 465 memcpy (table->sections + space, 466 sections, count * sizeof (sections[0])); 467 468 /* If these are the first file sections we can provide memory 469 from, push the file_stratum target. */ 470 if (!using_exec_ops) 471 { 472 using_exec_ops = 1; 473 push_target (&exec_ops); 474 } 475 } 476} 477 478/* Remove all target sections taken from ABFD. */ 479 480void 481remove_target_sections (bfd *abfd) 482{ 483 struct target_section *src, *dest; 484 struct target_section_table *table = current_target_sections; 485 486 dest = table->sections; 487 for (src = table->sections; src < table->sections_end; src++) 488 if (src->bfd != abfd) 489 { 490 /* Keep this section. */ 491 if (dest < src) 492 *dest = *src; 493 dest++; 494 } 495 496 /* If we've dropped any sections, resize the section table. */ 497 if (dest < src) 498 { 499 int old_count; 500 501 old_count = resize_section_table (table, dest - src); 502 503 /* If we don't have any more sections to read memory from, 504 remove the file_stratum target from the stack. */ 505 if (old_count + (dest - src) == 0) 506 { 507 struct program_space *pspace; 508 509 ALL_PSPACES (pspace) 510 if (pspace->target_sections.sections 511 != pspace->target_sections.sections_end) 512 return; 513 514 unpush_target (&exec_ops); 515 } 516 } 517} 518 519 520static void 521bfdsec_to_vmap (struct bfd *abfd, struct bfd_section *sect, void *arg3) 522{ 523 struct vmap_and_bfd *vmap_bfd = (struct vmap_and_bfd *) arg3; 524 struct vmap *vp; 525 526 vp = vmap_bfd->pvmap; 527 528 if ((bfd_get_section_flags (abfd, sect) & SEC_LOAD) == 0) 529 return; 530 531 if (strcmp (bfd_section_name (abfd, sect), ".text") == 0) 532 { 533 vp->tstart = bfd_section_vma (abfd, sect); 534 vp->tend = vp->tstart + bfd_section_size (abfd, sect); 535 vp->tvma = bfd_section_vma (abfd, sect); 536 vp->toffs = sect->filepos; 537 } 538 else if (strcmp (bfd_section_name (abfd, sect), ".data") == 0) 539 { 540 vp->dstart = bfd_section_vma (abfd, sect); 541 vp->dend = vp->dstart + bfd_section_size (abfd, sect); 542 vp->dvma = bfd_section_vma (abfd, sect); 543 } 544 /* Silently ignore other types of sections. (FIXME?) */ 545} 546 547/* Make a vmap for ABFD which might be a member of the archive ARCH. 548 Return the new vmap. */ 549 550struct vmap * 551map_vmap (bfd *abfd, bfd *arch) 552{ 553 struct vmap_and_bfd vmap_bfd; 554 struct vmap *vp, **vpp; 555 556 vp = (struct vmap *) xmalloc (sizeof (*vp)); 557 memset ((char *) vp, '\0', sizeof (*vp)); 558 vp->nxt = 0; 559 vp->bfd = abfd; 560 vp->name = bfd_get_filename (arch ? arch : abfd); 561 vp->member = arch ? bfd_get_filename (abfd) : ""; 562 563 vmap_bfd.pbfd = arch; 564 vmap_bfd.pvmap = vp; 565 bfd_map_over_sections (abfd, bfdsec_to_vmap, &vmap_bfd); 566 567 /* Find the end of the list and append. */ 568 for (vpp = &vmap; *vpp; vpp = &(*vpp)->nxt) 569 ; 570 *vpp = vp; 571 572 return vp; 573} 574 575 576VEC(mem_range_s) * 577section_table_available_memory (VEC(mem_range_s) *memory, 578 CORE_ADDR memaddr, ULONGEST len, 579 struct target_section *sections, 580 struct target_section *sections_end) 581{ 582 struct target_section *p; 583 584 for (p = sections; p < sections_end; p++) 585 { 586 if ((bfd_get_section_flags (p->bfd, p->the_bfd_section) 587 & SEC_READONLY) == 0) 588 continue; 589 590 /* Copy the meta-data, adjusted. */ 591 if (mem_ranges_overlap (p->addr, p->endaddr - p->addr, memaddr, len)) 592 { 593 ULONGEST lo1, hi1, lo2, hi2; 594 struct mem_range *r; 595 596 lo1 = memaddr; 597 hi1 = memaddr + len; 598 599 lo2 = p->addr; 600 hi2 = p->endaddr; 601 602 r = VEC_safe_push (mem_range_s, memory, NULL); 603 604 r->start = max (lo1, lo2); 605 r->length = min (hi1, hi2) - r->start; 606 } 607 } 608 609 return memory; 610} 611 612int 613section_table_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf, 614 ULONGEST offset, LONGEST len, 615 struct target_section *sections, 616 struct target_section *sections_end, 617 const char *section_name) 618{ 619 int res; 620 struct target_section *p; 621 ULONGEST memaddr = offset; 622 ULONGEST memend = memaddr + len; 623 624 if (len <= 0) 625 internal_error (__FILE__, __LINE__, 626 _("failed internal consistency check")); 627 628 for (p = sections; p < sections_end; p++) 629 { 630 if (section_name && strcmp (section_name, p->the_bfd_section->name) != 0) 631 continue; /* not the section we need. */ 632 if (memaddr >= p->addr) 633 { 634 if (memend <= p->endaddr) 635 { 636 /* Entire transfer is within this section. */ 637 if (writebuf) 638 res = bfd_set_section_contents (p->bfd, p->the_bfd_section, 639 writebuf, memaddr - p->addr, 640 len); 641 else 642 res = bfd_get_section_contents (p->bfd, p->the_bfd_section, 643 readbuf, memaddr - p->addr, 644 len); 645 return (res != 0) ? len : 0; 646 } 647 else if (memaddr >= p->endaddr) 648 { 649 /* This section ends before the transfer starts. */ 650 continue; 651 } 652 else 653 { 654 /* This section overlaps the transfer. Just do half. */ 655 len = p->endaddr - memaddr; 656 if (writebuf) 657 res = bfd_set_section_contents (p->bfd, p->the_bfd_section, 658 writebuf, memaddr - p->addr, 659 len); 660 else 661 res = bfd_get_section_contents (p->bfd, p->the_bfd_section, 662 readbuf, memaddr - p->addr, 663 len); 664 return (res != 0) ? len : 0; 665 } 666 } 667 } 668 669 return 0; /* We can't help. */ 670} 671 672struct target_section_table * 673exec_get_section_table (struct target_ops *ops) 674{ 675 return current_target_sections; 676} 677 678static LONGEST 679exec_xfer_partial (struct target_ops *ops, enum target_object object, 680 const char *annex, gdb_byte *readbuf, 681 const gdb_byte *writebuf, 682 ULONGEST offset, LONGEST len) 683{ 684 struct target_section_table *table = target_get_section_table (ops); 685 686 if (object == TARGET_OBJECT_MEMORY) 687 return section_table_xfer_memory_partial (readbuf, writebuf, 688 offset, len, 689 table->sections, 690 table->sections_end, 691 NULL); 692 else 693 return -1; 694} 695 696 697void 698print_section_info (struct target_section_table *t, bfd *abfd) 699{ 700 struct gdbarch *gdbarch = gdbarch_from_bfd (abfd); 701 struct target_section *p; 702 /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */ 703 int wid = gdbarch_addr_bit (gdbarch) <= 32 ? 8 : 16; 704 705 printf_filtered ("\t`%s', ", bfd_get_filename (abfd)); 706 wrap_here (" "); 707 printf_filtered (_("file type %s.\n"), bfd_get_target (abfd)); 708 if (abfd == exec_bfd) 709 { 710 /* gcc-3.4 does not like the initialization in 711 <p == t->sections_end>. */ 712 bfd_vma displacement = 0; 713 bfd_vma entry_point; 714 715 for (p = t->sections; p < t->sections_end; p++) 716 { 717 asection *asect = p->the_bfd_section; 718 719 if ((bfd_get_section_flags (abfd, asect) & (SEC_ALLOC | SEC_LOAD)) 720 != (SEC_ALLOC | SEC_LOAD)) 721 continue; 722 723 if (bfd_get_section_vma (abfd, asect) <= abfd->start_address 724 && abfd->start_address < (bfd_get_section_vma (abfd, asect) 725 + bfd_get_section_size (asect))) 726 { 727 displacement = p->addr - bfd_get_section_vma (abfd, asect); 728 break; 729 } 730 } 731 if (p == t->sections_end) 732 warning (_("Cannot find section for the entry point of %s."), 733 bfd_get_filename (abfd)); 734 735 entry_point = gdbarch_addr_bits_remove (gdbarch, 736 bfd_get_start_address (abfd) 737 + displacement); 738 printf_filtered (_("\tEntry point: %s\n"), 739 paddress (gdbarch, entry_point)); 740 } 741 for (p = t->sections; p < t->sections_end; p++) 742 { 743 printf_filtered ("\t%s", hex_string_custom (p->addr, wid)); 744 printf_filtered (" - %s", hex_string_custom (p->endaddr, wid)); 745 746 /* FIXME: A format of "08l" is not wide enough for file offsets 747 larger than 4GB. OTOH, making it "016l" isn't desirable either 748 since most output will then be much wider than necessary. It 749 may make sense to test the size of the file and choose the 750 format string accordingly. */ 751 /* FIXME: i18n: Need to rewrite this sentence. */ 752 if (info_verbose) 753 printf_filtered (" @ %s", 754 hex_string_custom (p->the_bfd_section->filepos, 8)); 755 printf_filtered (" is %s", bfd_section_name (p->bfd, 756 p->the_bfd_section)); 757 if (p->bfd != abfd) 758 printf_filtered (" in %s", bfd_get_filename (p->bfd)); 759 printf_filtered ("\n"); 760 } 761} 762 763static void 764exec_files_info (struct target_ops *t) 765{ 766 print_section_info (current_target_sections, exec_bfd); 767 768 if (vmap) 769 { 770 int addr_size = gdbarch_addr_bit (target_gdbarch) / 8; 771 struct vmap *vp; 772 773 printf_unfiltered (_("\tMapping info for file `%s'.\n"), vmap->name); 774 printf_unfiltered ("\t %*s %*s %*s %*s %8.8s %s\n", 775 addr_size * 2, "tstart", 776 addr_size * 2, "tend", 777 addr_size * 2, "dstart", 778 addr_size * 2, "dend", 779 "section", 780 "file(member)"); 781 782 for (vp = vmap; vp; vp = vp->nxt) 783 printf_unfiltered ("\t0x%s 0x%s 0x%s 0x%s %s%s%s%s\n", 784 phex (vp->tstart, addr_size), 785 phex (vp->tend, addr_size), 786 phex (vp->dstart, addr_size), 787 phex (vp->dend, addr_size), 788 vp->name, 789 *vp->member ? "(" : "", vp->member, 790 *vp->member ? ")" : ""); 791 } 792} 793 794static void 795set_section_command (char *args, int from_tty) 796{ 797 struct target_section *p; 798 char *secname; 799 unsigned seclen; 800 unsigned long secaddr; 801 char secprint[100]; 802 long offset; 803 struct target_section_table *table; 804 805 if (args == 0) 806 error (_("Must specify section name and its virtual address")); 807 808 /* Parse out section name. */ 809 for (secname = args; !isspace (*args); args++); 810 seclen = args - secname; 811 812 /* Parse out new virtual address. */ 813 secaddr = parse_and_eval_address (args); 814 815 table = current_target_sections; 816 for (p = table->sections; p < table->sections_end; p++) 817 { 818 if (!strncmp (secname, bfd_section_name (exec_bfd, 819 p->the_bfd_section), seclen) 820 && bfd_section_name (exec_bfd, p->the_bfd_section)[seclen] == '\0') 821 { 822 offset = secaddr - p->addr; 823 p->addr += offset; 824 p->endaddr += offset; 825 if (from_tty) 826 exec_files_info (&exec_ops); 827 return; 828 } 829 } 830 if (seclen >= sizeof (secprint)) 831 seclen = sizeof (secprint) - 1; 832 strncpy (secprint, secname, seclen); 833 secprint[seclen] = '\0'; 834 error (_("Section %s not found"), secprint); 835} 836 837/* If we can find a section in FILENAME with BFD index INDEX, adjust 838 it to ADDRESS. */ 839 840void 841exec_set_section_address (const char *filename, int index, CORE_ADDR address) 842{ 843 struct target_section *p; 844 struct target_section_table *table; 845 846 table = current_target_sections; 847 for (p = table->sections; p < table->sections_end; p++) 848 { 849 if (filename_cmp (filename, p->bfd->filename) == 0 850 && index == p->the_bfd_section->index) 851 { 852 p->endaddr += address - p->addr; 853 p->addr = address; 854 } 855 } 856} 857 858/* If mourn is being called in all the right places, this could be say 859 `gdb internal error' (since generic_mourn calls 860 breakpoint_init_inferior). */ 861 862static int 863ignore (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) 864{ 865 return 0; 866} 867 868static int 869exec_has_memory (struct target_ops *ops) 870{ 871 /* We can provide memory if we have any file/target sections to read 872 from. */ 873 return (current_target_sections->sections 874 != current_target_sections->sections_end); 875} 876 877/* Find mapped memory. */ 878 879extern void 880exec_set_find_memory_regions (int (*func) (find_memory_region_ftype, void *)) 881{ 882 exec_ops.to_find_memory_regions = func; 883} 884 885static char *exec_make_note_section (bfd *, int *); 886 887/* Fill in the exec file target vector. Very few entries need to be 888 defined. */ 889 890static void 891init_exec_ops (void) 892{ 893 exec_ops.to_shortname = "exec"; 894 exec_ops.to_longname = "Local exec file"; 895 exec_ops.to_doc = "Use an executable file as a target.\n\ 896Specify the filename of the executable file."; 897 exec_ops.to_open = exec_open; 898 exec_ops.to_close = exec_close_1; 899 exec_ops.to_attach = find_default_attach; 900 exec_ops.to_xfer_partial = exec_xfer_partial; 901 exec_ops.to_get_section_table = exec_get_section_table; 902 exec_ops.to_files_info = exec_files_info; 903 exec_ops.to_insert_breakpoint = ignore; 904 exec_ops.to_remove_breakpoint = ignore; 905 exec_ops.to_create_inferior = find_default_create_inferior; 906 exec_ops.to_stratum = file_stratum; 907 exec_ops.to_has_memory = exec_has_memory; 908 exec_ops.to_make_corefile_notes = exec_make_note_section; 909 exec_ops.to_magic = OPS_MAGIC; 910} 911 912void 913_initialize_exec (void) 914{ 915 struct cmd_list_element *c; 916 917 init_exec_ops (); 918 919 if (!dbx_commands) 920 { 921 c = add_cmd ("file", class_files, file_command, _("\ 922Use FILE as program to be debugged.\n\ 923It is read for its symbols, for getting the contents of pure memory,\n\ 924and it is the program executed when you use the `run' command.\n\ 925If FILE cannot be found as specified, your execution directory path\n\ 926($PATH) is searched for a command of that name.\n\ 927No arg means to have no executable file and no symbols."), &cmdlist); 928 set_cmd_completer (c, filename_completer); 929 } 930 931 c = add_cmd ("exec-file", class_files, exec_file_command, _("\ 932Use FILE as program for getting contents of pure memory.\n\ 933If FILE cannot be found as specified, your execution directory path\n\ 934is searched for a command of that name.\n\ 935No arg means have no executable file."), &cmdlist); 936 set_cmd_completer (c, filename_completer); 937 938 add_com ("section", class_files, set_section_command, _("\ 939Change the base address of section SECTION of the exec file to ADDR.\n\ 940This can be used if the exec file does not contain section addresses,\n\ 941(such as in the a.out format), or when the addresses specified in the\n\ 942file itself are wrong. Each section must be changed separately. The\n\ 943``info files'' command lists all the sections and their addresses.")); 944 945 add_setshow_boolean_cmd ("write", class_support, &write_files, _("\ 946Set writing into executable and core files."), _("\ 947Show writing into executable and core files."), NULL, 948 NULL, 949 show_write_files, 950 &setlist, &showlist); 951 952 add_target (&exec_ops); 953} 954 955static char * 956exec_make_note_section (bfd *obfd, int *note_size) 957{ 958 error (_("Can't create a corefile")); 959} 960