gdb/exec.c

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