gdb/symfile.c - gdb

Global variables defined

Data types defined

Functions defined

Macros defined

Source code

  1. /* Generic symbol file reading for the GNU debugger, GDB.

  3.    Copyright (C) 1990-2015 Free Software Foundation, Inc.

  5.    Contributed by Cygnus Support, using pieces from other GDB modules.

  7.    This file is part of GDB.

  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.

  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.

  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/>.  */

  22. #include "defs.h"
  23. #include "arch-utils.h"
  24. #include "bfdlink.h"
  25. #include "symtab.h"
  26. #include "gdbtypes.h"
  27. #include "gdbcore.h"
  28. #include "frame.h"
  29. #include "target.h"
  30. #include "value.h"
  31. #include "symfile.h"
  32. #include "objfiles.h"
  33. #include "source.h"
  34. #include "gdbcmd.h"
  35. #include "breakpoint.h"
  36. #include "language.h"
  37. #include "complaints.h"
  38. #include "demangle.h"
  39. #include "inferior.h"
  40. #include "regcache.h"
  41. #include "filenames.h"                /* for DOSish file names */
  42. #include "gdb-stabs.h"
  43. #include "gdb_obstack.h"
  44. #include "completer.h"
  45. #include "bcache.h"
  46. #include "hashtab.h"
  47. #include "readline/readline.h"
  48. #include "block.h"
  49. #include "observer.h"
  50. #include "exec.h"
  51. #include "parser-defs.h"
  52. #include "varobj.h"
  53. #include "elf-bfd.h"
  54. #include "solib.h"
  55. #include "remote.h"
  56. #include "stack.h"
  57. #include "gdb_bfd.h"
  58. #include "cli/cli-utils.h"

  60. #include <sys/types.h>
  61. #include <fcntl.h>
  62. #include <sys/stat.h>
  63. #include <ctype.h>
  64. #include <time.h>
  65. #include <sys/time.h>

  67. #include "psymtab.h"

  69. ‌int (*deprecated_ui_load_progress_hook) (const char *section,
  70.                                          unsigned long num);
  71. ‌void (*deprecated_show_load_progress) (const char *section,
  72.                             unsigned long section_sent,
  73.                             unsigned long section_size,
  74.                             unsigned long total_sent,
  75.                             unsigned long total_size);
  76. ‌void (*deprecated_pre_add_symbol_hook) (const char *);
  77. ‌void (*deprecated_post_add_symbol_hook) (void);

  79. static void clear_symtab_users_cleanup (void *ignore);

  81. /* Global variables owned by this file.  */
  82. ‌int readnow_symbol_files;        /* Read full symbols immediately.  */

  84. /* Functions this file defines.  */

  86. static void load_command (char *, int);

  88. static void symbol_file_add_main_1 (const char *args, int from_tty, int flags);

  90. static void add_symbol_file_command (char *, int);

  92. static const struct sym_fns *find_sym_fns (bfd *);

  94. static void decrement_reading_symtab (void *);

  96. static void overlay_invalidate_all (void);

  98. static void overlay_auto_command (char *, int);

  100. static void overlay_manual_command (char *, int);

  102. static void overlay_off_command (char *, int);

  104. static void overlay_load_command (char *, int);

  106. static void overlay_command (char *, int);

  108. static void simple_free_overlay_table (void);

  110. static void read_target_long_array (CORE_ADDR, unsigned int *, int, int,
  111.                                     enum bfd_endian);

  113. static int simple_read_overlay_table (void);

  115. static int simple_overlay_update_1 (struct obj_section *);

  117. static void add_filename_language (char *ext, enum language lang);

  119. static void info_ext_lang_command (char *args, int from_tty);

  121. static void init_filename_language_table (void);

  123. static void symfile_find_segment_sections (struct objfile *objfile);

  125. void _initialize_symfile (void);

  127. /* List of all available sym_fns.  On gdb startup, each object file reader
  128.    calls add_symtab_fns() to register information on each format it is
  129.    prepared to read.  */

  131. typedef struct
  132. {
  133.   /* BFD flavour that we handle.  */
  134.   enum bfd_flavour sym_flavour;

  136.   /* The "vtable" of symbol functions.  */
  137.   const struct sym_fns *sym_fns;
  138. ‌} registered_sym_fns;

  140. ‌DEF_VEC_O (registered_sym_fns);

  142. static VEC (registered_sym_fns) *symtab_fns = NULL;

  144. /* Values for "set print symbol-loading".  */

  146. ‌const char print_symbol_loading_off[] = "off";
  147. ‌const char print_symbol_loading_brief[] = "brief";
  148. ‌const char print_symbol_loading_full[] = "full";
  149. ‌static const char *print_symbol_loading_enums[] =
  150. {
  151.   print_symbol_loading_off,
  152.   print_symbol_loading_brief,
  153.   print_symbol_loading_full,
  154.   NULL
  155. };
  156. ‌static const char *print_symbol_loading = print_symbol_loading_full;

  158. /* If non-zero, shared library symbols will be added automatically
  159.    when the inferior is created, new libraries are loaded, or when
  160.    attaching to the inferior.  This is almost always what users will
  161.    want to have happen; but for very large programs, the startup time
  162.    will be excessive, and so if this is a problem, the user can clear
  163.    this flag and then add the shared library symbols as needed.  Note
  164.    that there is a potential for confusion, since if the shared
  165.    library symbols are not loaded, commands like "info fun" will *not*
  166.    report all the functions that are actually present.  */

  168. ‌int auto_solib_add = 1;


  171. /* Return non-zero if symbol-loading messages should be printed.
  172.    FROM_TTY is the standard from_tty argument to gdb commands.
  173.    If EXEC is non-zero the messages are for the executable.
  174.    Otherwise, messages are for shared libraries.
  175.    If FULL is non-zero then the caller is printing a detailed message.
  176.    E.g., the message includes the shared library name.
  177.    Otherwise, the caller is printing a brief "summary" message.  */

  179. int
  180. ‌print_symbol_loading_p (int from_tty, int exec, int full)
  181. {
  182.   if (!from_tty && !info_verbose)
  183.     return 0;

  185.   if (exec)
  186.     {
  187.       /* We don't check FULL for executables, there are few such
  188.          messages, therefore brief == full.  */
  189.       return print_symbol_loading != print_symbol_loading_off;
  190.     }
  191.   if (full)
  192.     return print_symbol_loading == print_symbol_loading_full;
  193.   return print_symbol_loading == print_symbol_loading_brief;
  194. }

  196. /* True if we are reading a symbol table.  */

  198. ‌int currently_reading_symtab = 0;

  200. static void
  201. ‌decrement_reading_symtab (void *dummy)
  202. {
  203.   currently_reading_symtab--;
  204.   gdb_assert (currently_reading_symtab >= 0);
  205. }

  207. /* Increment currently_reading_symtab and return a cleanup that can be
  208.    used to decrement it.  */

  210. struct cleanup *
  211. ‌increment_reading_symtab (void)
  212. {
  213.   ++currently_reading_symtab;
  214.   gdb_assert (currently_reading_symtab > 0);
  215.   return make_cleanup (decrement_reading_symtab, NULL);
  216. }

  218. /* Remember the lowest-addressed loadable section we've seen.
  219.    This function is called via bfd_map_over_sections.

  221.    In case of equal vmas, the section with the largest size becomes the
  222.    lowest-addressed loadable section.

  224.    If the vmas and sizes are equal, the last section is considered the
  225.    lowest-addressed loadable section.  */

  227. void
  228. ‌find_lowest_section (bfd *abfd, asection *sect, void *obj)
  229. {
  230.   asection **lowest = (asection **) obj;

  232.   if (0 == (bfd_get_section_flags (abfd, sect) & (SEC_ALLOC | SEC_LOAD)))
  233.     return;
  234.   if (!*lowest)
  235.     *lowest = sect;                /* First loadable section */
  236.   else if (bfd_section_vma (abfd, *lowest) > bfd_section_vma (abfd, sect))
  237.     *lowest = sect;                /* A lower loadable section */
  238.   else if (bfd_section_vma (abfd, *lowest) == bfd_section_vma (abfd, sect)
  239.            && (bfd_section_size (abfd, (*lowest))
  240.                <= bfd_section_size (abfd, sect)))
  241.     *lowest = sect;
  242. }

  244. /* Create a new section_addr_info, with room for NUM_SECTIONS.  The
  245.    new object's 'num_sections' field is set to 0; it must be updated
  246.    by the caller.  */

  248. struct section_addr_info *
  249. ‌alloc_section_addr_info (size_t num_sections)
  250. {
  251.   struct section_addr_info *sap;
  252.   size_t size;

  254.   size = (sizeof (struct section_addr_info)
  255.           +  sizeof (struct other_sections) * (num_sections - 1));
  256.   sap = (struct section_addr_info *) xmalloc (size);
  257.   memset (sap, 0, size);

  259.   return sap;
  260. }

  262. /* Build (allocate and populate) a section_addr_info struct from
  263.    an existing section table.  */

  265. extern struct section_addr_info *
  266. ‌build_section_addr_info_from_section_table (const struct target_section *start,
  267.                                             const struct target_section *end)
  268. {
  269.   struct section_addr_info *sap;
  270.   const struct target_section *stp;
  271.   int oidx;

  273.   sap = alloc_section_addr_info (end - start);

  275.   for (stp = start, oidx = 0; stp != end; stp++)
  276.     {
  277.       struct bfd_section *asect = stp->the_bfd_section;
  278.       bfd *abfd = asect->owner;

  280.       if (bfd_get_section_flags (abfd, asect) & (SEC_ALLOC | SEC_LOAD)
  281.           && oidx < end - start)
  282.         {
  283.           sap->other[oidx].addr = stp->addr;
  284.           sap->other[oidx].name = xstrdup (bfd_section_name (abfd, asect));
  285.           sap->other[oidx].sectindex = gdb_bfd_section_index (abfd, asect);
  286.           oidx++;
  287.         }
  288.     }

  290.   sap->num_sections = oidx;

  292.   return sap;
  293. }

  295. /* Create a section_addr_info from section offsets in ABFD.  */

  297. static struct section_addr_info *
  298. ‌build_section_addr_info_from_bfd (bfd *abfd)
  299. {
  300.   struct section_addr_info *sap;
  301.   int i;
  302.   struct bfd_section *sec;

  304.   sap = alloc_section_addr_info (bfd_count_sections (abfd));
  305.   for (i = 0, sec = abfd->sections; sec != NULL; sec = sec->next)
  306.     if (bfd_get_section_flags (abfd, sec) & (SEC_ALLOC | SEC_LOAD))
  307.       {
  308.         sap->other[i].addr = bfd_get_section_vma (abfd, sec);
  309.         sap->other[i].name = xstrdup (bfd_get_section_name (abfd, sec));
  310.         sap->other[i].sectindex = gdb_bfd_section_index (abfd, sec);
  311.         i++;
  312.       }

  314.   sap->num_sections = i;

  316.   return sap;
  317. }

  319. /* Create a section_addr_info from section offsets in OBJFILE.  */

  321. struct section_addr_info *
  322. ‌build_section_addr_info_from_objfile (const struct objfile *objfile)
  323. {
  324.   struct section_addr_info *sap;
  325.   int i;

  327.   /* Before reread_symbols gets rewritten it is not safe to call:
  328.      gdb_assert (objfile->num_sections == bfd_count_sections (objfile->obfd));
  329.      */
  330.   sap = build_section_addr_info_from_bfd (objfile->obfd);
  331.   for (i = 0; i < sap->num_sections; i++)
  332.     {
  333.       int sectindex = sap->other[i].sectindex;

  335.       sap->other[i].addr += objfile->section_offsets->offsets[sectindex];
  336.     }
  337.   return sap;
  338. }

  340. /* Free all memory allocated by build_section_addr_info_from_section_table.  */

  342. extern void
  343. ‌free_section_addr_info (struct section_addr_info *sap)
  344. {
  345.   int idx;

  347.   for (idx = 0; idx < sap->num_sections; idx++)
  348.     xfree (sap->other[idx].name);
  349.   xfree (sap);
  350. }

  352. /* Initialize OBJFILE's sect_index_* members.  */

  354. static void
  355. ‌init_objfile_sect_indices (struct objfile *objfile)
  356. {
  357.   asection *sect;
  358.   int i;

  360.   sect = bfd_get_section_by_name (objfile->obfd, ".text");
  361.   if (sect)
  362.     objfile->sect_index_text = sect->index;

  364.   sect = bfd_get_section_by_name (objfile->obfd, ".data");
  365.   if (sect)
  366.     objfile->sect_index_data = sect->index;

  368.   sect = bfd_get_section_by_name (objfile->obfd, ".bss");
  369.   if (sect)
  370.     objfile->sect_index_bss = sect->index;

  372.   sect = bfd_get_section_by_name (objfile->obfd, ".rodata");
  373.   if (sect)
  374.     objfile->sect_index_rodata = sect->index;

  376.   /* This is where things get really weird...  We MUST have valid
  377.      indices for the various sect_index_* members or gdb will abort.
  378.      So if for example, there is no ".text" section, we have to
  379.      accomodate that.  First, check for a file with the standard
  380.      one or two segments.  */

  382.   symfile_find_segment_sections (objfile);

  384.   /* Except when explicitly adding symbol files at some address,
  385.      section_offsets contains nothing but zeros, so it doesn't matter
  386.      which slot in section_offsets the individual sect_index_* members
  387.      index into.  So if they are all zero, it is safe to just point
  388.      all the currently uninitialized indices to the first slot.  But
  389.      beware: if this is the main executable, it may be relocated
  390.      later, e.g. by the remote qOffsets packet, and then this will
  391.      be wrong!  That's why we try segments first.  */

  393.   for (i = 0; i < objfile->num_sections; i++)
  394.     {
  395.       if (ANOFFSET (objfile->section_offsets, i) != 0)
  396.         {
  397.           break;
  398.         }
  399.     }
  400.   if (i == objfile->num_sections)
  401.     {
  402.       if (objfile->sect_index_text == -1)
  403.         objfile->sect_index_text = 0;
  404.       if (objfile->sect_index_data == -1)
  405.         objfile->sect_index_data = 0;
  406.       if (objfile->sect_index_bss == -1)
  407.         objfile->sect_index_bss = 0;
  408.       if (objfile->sect_index_rodata == -1)
  409.         objfile->sect_index_rodata = 0;
  410.     }
  411. }

  413. /* The arguments to place_section.  */

  415. ‌struct place_section_arg
  416. {
  417.   struct section_offsets *offsets;
  418.   CORE_ADDR lowest;
  419. };

  421. /* Find a unique offset to use for loadable section SECT if
  422.    the user did not provide an offset.  */

  424. static void
  425. ‌place_section (bfd *abfd, asection *sect, void *obj)
  426. {
  427.   struct place_section_arg *arg = obj;
  428.   CORE_ADDR *offsets = arg->offsets->offsets, start_addr;
  429.   int done;
  430.   ULONGEST align = ((ULONGEST) 1) << bfd_get_section_alignment (abfd, sect);

  432.   /* We are only interested in allocated sections.  */
  433.   if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
  434.     return;

  436.   /* If the user specified an offset, honor it.  */
  437.   if (offsets[gdb_bfd_section_index (abfd, sect)] != 0)
  438.     return;

  440.   /* Otherwise, let's try to find a place for the section.  */
  441.   start_addr = (arg->lowest + align - 1) & -align;

  443.   do {
  444.     asection *cur_sec;

  446.     done = 1;

  448.     for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
  449.       {
  450.         int indx = cur_sec->index;

  452.         /* We don't need to compare against ourself.  */
  453.         if (cur_sec == sect)
  454.           continue;

  456.         /* We can only conflict with allocated sections.  */
  457.         if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
  458.           continue;

  460.         /* If the section offset is 0, either the section has not been placed
  461.            yet, or it was the lowest section placed (in which case LOWEST
  462.            will be past its end).  */
  463.         if (offsets[indx] == 0)
  464.           continue;

  466.         /* If this section would overlap us, then we must move up.  */
  467.         if (start_addr + bfd_get_section_size (sect) > offsets[indx]
  468.             && start_addr < offsets[indx] + bfd_get_section_size (cur_sec))
  469.           {
  470.             start_addr = offsets[indx] + bfd_get_section_size (cur_sec);
  471.             start_addr = (start_addr + align - 1) & -align;
  472.             done = 0;
  473.             break;
  474.           }

  476.         /* Otherwise, we appear to be OK.  So far.  */
  477.       }
  478.     }
  479.   while (!done);

  481.   offsets[gdb_bfd_section_index (abfd, sect)] = start_addr;
  482.   arg->lowest = start_addr + bfd_get_section_size (sect);
  483. }

  485. /* Store struct section_addr_info as prepared (made relative and with SECTINDEX
  486.    filled-in) by addr_info_make_relative into SECTION_OFFSETS of NUM_SECTIONS
  487.    entries.  */

  489. void
  490. ‌relative_addr_info_to_section_offsets (struct section_offsets *section_offsets,
  491.                                        int num_sections,
  492.                                        const struct section_addr_info *addrs)
  493. {
  494.   int i;

  496.   memset (section_offsets, 0, SIZEOF_N_SECTION_OFFSETS (num_sections));

  498.   /* Now calculate offsets for section that were specified by the caller.  */
  499.   for (i = 0; i < addrs->num_sections; i++)
  500.     {
  501.       const struct other_sections *osp;

  503.       osp = &addrs->other[i];
  504.       if (osp->sectindex == -1)
  505.           continue;

  507.       /* Record all sections in offsets.  */
  508.       /* The section_offsets in the objfile are here filled in using
  509.          the BFD index.  */
  510.       section_offsets->offsets[osp->sectindex] = osp->addr;
  511.     }
  512. }

  514. /* Transform section name S for a name comparison.  prelink can split section
  515.    `.bss' into two sections `.dynbss' and `.bss' (in this order).  Similarly
  516.    prelink can split `.sbss' into `.sdynbss' and `.sbss'.  Use virtual address
  517.    of the new `.dynbss' (`.sdynbss') section as the adjacent new `.bss'
  518.    (`.sbss') section has invalid (increased) virtual address.  */

  520. static const char *
  521. ‌addr_section_name (const char *s)
  522. {
  523.   if (strcmp (s, ".dynbss") == 0)
  524.     return ".bss";
  525.   if (strcmp (s, ".sdynbss") == 0)
  526.     return ".sbss";

  528.   return s;
  529. }

  531. /* qsort comparator for addrs_section_sort.  Sort entries in ascending order by
  532.    their (name, sectindex) pair.  sectindex makes the sort by name stable.  */

  534. static int
  535. ‌addrs_section_compar (const void *ap, const void *bp)
  536. {
  537.   const struct other_sections *a = *((struct other_sections **) ap);
  538.   const struct other_sections *b = *((struct other_sections **) bp);
  539.   int retval;

  541.   retval = strcmp (addr_section_name (a->name), addr_section_name (b->name));
  542.   if (retval)
  543.     return retval;

  545.   return a->sectindex - b->sectindex;
  546. }

  548. /* Provide sorted array of pointers to sections of ADDRS.  The array is
  549.    terminated by NULL.  Caller is responsible to call xfree for it.  */

  551. static struct other_sections **
  552. ‌addrs_section_sort (struct section_addr_info *addrs)
  553. {
  554.   struct other_sections **array;
  555.   int i;

  557.   /* `+ 1' for the NULL terminator.  */
  558.   array = xmalloc (sizeof (*array) * (addrs->num_sections + 1));
  559.   for (i = 0; i < addrs->num_sections; i++)
  560.     array[i] = &addrs->other[i];
  561.   array[i] = NULL;

  563.   qsort (array, i, sizeof (*array), addrs_section_compar);

  565.   return array;
  566. }

  568. /* Relativize absolute addresses in ADDRS into offsets based on ABFD.  Fill-in
  569.    also SECTINDEXes specific to ABFD there.  This function can be used to
  570.    rebase ADDRS to start referencing different BFD than before.  */

  572. void
  573. ‌addr_info_make_relative (struct section_addr_info *addrs, bfd *abfd)
  574. {
  575.   asection *lower_sect;
  576.   CORE_ADDR lower_offset;
  577.   int i;
  578.   struct cleanup *my_cleanup;
  579.   struct section_addr_info *abfd_addrs;
  580.   struct other_sections **addrs_sorted, **abfd_addrs_sorted;
  581.   struct other_sections **addrs_to_abfd_addrs;

  583.   /* Find lowest loadable section to be used as starting point for
  584.      continguous sections.  */
  585.   lower_sect = NULL;
  586.   bfd_map_over_sections (abfd, find_lowest_section, &lower_sect);
  587.   if (lower_sect == NULL)
  588.     {
  589.       warning (_("no loadable sections found in added symbol-file %s"),
  590.                bfd_get_filename (abfd));
  591.       lower_offset = 0;
  592.     }
  593.   else
  594.     lower_offset = bfd_section_vma (bfd_get_filename (abfd), lower_sect);

  596.   /* Create ADDRS_TO_ABFD_ADDRS array to map the sections in ADDRS to sections
  597.      in ABFD.  Section names are not unique - there can be multiple sections of
  598.      the same name.  Also the sections of the same name do not have to be
  599.      adjacent to each other.  Some sections may be present only in one of the
  600.      files.  Even sections present in both files do not have to be in the same
  601.      order.

  603.      Use stable sort by name for the sections in both files.  Then linearly
  604.      scan both lists matching as most of the entries as possible.  */

  606.   addrs_sorted = addrs_section_sort (addrs);
  607.   my_cleanup = make_cleanup (xfree, addrs_sorted);

  609.   abfd_addrs = build_section_addr_info_from_bfd (abfd);
  610.   make_cleanup_free_section_addr_info (abfd_addrs);
  611.   abfd_addrs_sorted = addrs_section_sort (abfd_addrs);
  612.   make_cleanup (xfree, abfd_addrs_sorted);

  614.   /* Now create ADDRS_TO_ABFD_ADDRS from ADDRS_SORTED and
  615.      ABFD_ADDRS_SORTED.  */

  617.   addrs_to_abfd_addrs = xzalloc (sizeof (*addrs_to_abfd_addrs)
  618.                                  * addrs->num_sections);
  619.   make_cleanup (xfree, addrs_to_abfd_addrs);

  621.   while (*addrs_sorted)
  622.     {
  623.       const char *sect_name = addr_section_name ((*addrs_sorted)->name);

  625.       while (*abfd_addrs_sorted
  626.              && strcmp (addr_section_name ((*abfd_addrs_sorted)->name),
  627.                         sect_name) < 0)
  628.         abfd_addrs_sorted++;

  630.       if (*abfd_addrs_sorted
  631.           && strcmp (addr_section_name ((*abfd_addrs_sorted)->name),
  632.                      sect_name) == 0)
  633.         {
  634.           int index_in_addrs;

  636.           /* Make the found item directly addressable from ADDRS.  */
  637.           index_in_addrs = *addrs_sorted - addrs->other;
  638.           gdb_assert (addrs_to_abfd_addrs[index_in_addrs] == NULL);
  639.           addrs_to_abfd_addrs[index_in_addrs] = *abfd_addrs_sorted;

  641.           /* Never use the same ABFD entry twice.  */
  642.           abfd_addrs_sorted++;
  643.         }

  645.       addrs_sorted++;
  646.     }

  648.   /* Calculate offsets for the loadable sections.
  649.      FIXME! Sections must be in order of increasing loadable section
  650.      so that contiguous sections can use the lower-offset!!!

  652.      Adjust offsets if the segments are not contiguous.
  653.      If the section is contiguous, its offset should be set to
  654.      the offset of the highest loadable section lower than it
  655.      (the loadable section directly below it in memory).
  656.      this_offset = lower_offset = lower_addr - lower_orig_addr */

  658.   for (i = 0; i < addrs->num_sections; i++)
  659.     {
  660.       struct other_sections *sect = addrs_to_abfd_addrs[i];

  662.       if (sect)
  663.         {
  664.           /* This is the index used by BFD.  */
  665.           addrs->other[i].sectindex = sect->sectindex;

  667.           if (addrs->other[i].addr != 0)
  668.             {
  669.               addrs->other[i].addr -= sect->addr;
  670.               lower_offset = addrs->other[i].addr;
  671.             }
  672.           else
  673.             addrs->other[i].addr = lower_offset;
  674.         }
  675.       else
  676.         {
  677.           /* addr_section_name transformation is not used for SECT_NAME.  */
  678.           const char *sect_name = addrs->other[i].name;

  680.           /* This section does not exist in ABFD, which is normally
  681.              unexpected and we want to issue a warning.

  683.              However, the ELF prelinker does create a few sections which are
  684.              marked in the main executable as loadable (they are loaded in
  685.              memory from the DYNAMIC segment) and yet are not present in
  686.              separate debug info files.  This is fine, and should not cause
  687.              a warning.  Shared libraries contain just the section
  688.              ".gnu.liblist" but it is not marked as loadable there.  There is
  689.              no other way to identify them than by their name as the sections
  690.              created by prelink have no special flags.

  692.              For the sections `.bss' and `.sbss' see addr_section_name.  */

  694.           if (!(strcmp (sect_name, ".gnu.liblist") == 0
  695.                 || strcmp (sect_name, ".gnu.conflict") == 0
  696.                 || (strcmp (sect_name, ".bss") == 0
  697.                     && i > 0
  698.                     && strcmp (addrs->other[i - 1].name, ".dynbss") == 0
  699.                     && addrs_to_abfd_addrs[i - 1] != NULL)
  700.                 || (strcmp (sect_name, ".sbss") == 0
  701.                     && i > 0
  702.                     && strcmp (addrs->other[i - 1].name, ".sdynbss") == 0
  703.                     && addrs_to_abfd_addrs[i - 1] != NULL)))
  704.             warning (_("section %s not found in %s"), sect_name,
  705.                      bfd_get_filename (abfd));

  707.           addrs->other[i].addr = 0;
  708.           addrs->other[i].sectindex = -1;
  709.         }
  710.     }

  712.   do_cleanups (my_cleanup);
  713. }

  715. /* Parse the user's idea of an offset for dynamic linking, into our idea
  716.    of how to represent it for fast symbol reading.  This is the default
  717.    version of the sym_fns.sym_offsets function for symbol readers that
  718.    don't need to do anything special.  It allocates a section_offsets table
  719.    for the objectfile OBJFILE and stuffs ADDR into all of the offsets.  */

  721. void
  722. ‌default_symfile_offsets (struct objfile *objfile,
  723.                          const struct section_addr_info *addrs)
  724. {
  725.   objfile->num_sections = gdb_bfd_count_sections (objfile->obfd);
  726.   objfile->section_offsets = (struct section_offsets *)
  727.     obstack_alloc (&objfile->objfile_obstack,
  728.                    SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
  729.   relative_addr_info_to_section_offsets (objfile->section_offsets,
  730.                                          objfile->num_sections, addrs);

  732.   /* For relocatable files, all loadable sections will start at zero.
  733.      The zero is meaningless, so try to pick arbitrary addresses such
  734.      that no loadable sections overlap.  This algorithm is quadratic,
  735.      but the number of sections in a single object file is generally
  736.      small.  */
  737.   if ((bfd_get_file_flags (objfile->obfd) & (EXEC_P | DYNAMIC)) == 0)
  738.     {
  739.       struct place_section_arg arg;
  740.       bfd *abfd = objfile->obfd;
  741.       asection *cur_sec;

  743.       for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
  744.         /* We do not expect this to happen; just skip this step if the
  745.            relocatable file has a section with an assigned VMA.  */
  746.         if (bfd_section_vma (abfd, cur_sec) != 0)
  747.           break;

  749.       if (cur_sec == NULL)
  750.         {
  751.           CORE_ADDR *offsets = objfile->section_offsets->offsets;

  753.           /* Pick non-overlapping offsets for sections the user did not
  754.              place explicitly.  */
  755.           arg.offsets = objfile->section_offsets;
  756.           arg.lowest = 0;
  757.           bfd_map_over_sections (objfile->obfd, place_section, &arg);

  759.           /* Correctly filling in the section offsets is not quite
  760.              enough.  Relocatable files have two properties that
  761.              (most) shared objects do not:

  763.              - Their debug information will contain relocations.  Some
  764.              shared libraries do also, but many do not, so this can not
  765.              be assumed.

  767.              - If there are multiple code sections they will be loaded
  768.              at different relative addresses in memory than they are
  769.              in the objfile, since all sections in the file will start
  770.              at address zero.

  772.              Because GDB has very limited ability to map from an
  773.              address in debug info to the correct code section,
  774.              it relies on adding SECT_OFF_TEXT to things which might be
  775.              code.  If we clear all the section offsets, and set the
  776.              section VMAs instead, then symfile_relocate_debug_section
  777.              will return meaningful debug information pointing at the
  778.              correct sections.

  780.              GDB has too many different data structures for section
  781.              addresses - a bfd, objfile, and so_list all have section
  782.              tables, as does exec_ops.  Some of these could probably
  783.              be eliminated.  */

  785.           for (cur_sec = abfd->sections; cur_sec != NULL;
  786.                cur_sec = cur_sec->next)
  787.             {
  788.               if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
  789.                 continue;

  791.               bfd_set_section_vma (abfd, cur_sec, offsets[cur_sec->index]);
  792.               exec_set_section_address (bfd_get_filename (abfd),
  793.                                         cur_sec->index,
  794.                                         offsets[cur_sec->index]);
  795.               offsets[cur_sec->index] = 0;
  796.             }
  797.         }
  798.     }

  800.   /* Remember the bfd indexes for the .text, .data, .bss and
  801.      .rodata sections.  */
  802.   init_objfile_sect_indices (objfile);
  803. }

  805. /* Divide the file into segments, which are individual relocatable units.
  806.    This is the default version of the sym_fns.sym_segments function for
  807.    symbol readers that do not have an explicit representation of segments.
  808.    It assumes that object files do not have segments, and fully linked
  809.    files have a single segment.  */

  811. struct symfile_segment_data *
  812. ‌default_symfile_segments (bfd *abfd)
  813. {
  814.   int num_sections, i;
  815.   asection *sect;
  816.   struct symfile_segment_data *data;
  817.   CORE_ADDR low, high;

  819.   /* Relocatable files contain enough information to position each
  820.      loadable section independently; they should not be relocated
  821.      in segments.  */
  822.   if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) == 0)
  823.     return NULL;

  825.   /* Make sure there is at least one loadable section in the file.  */
  826.   for (sect = abfd->sections; sect != NULL; sect = sect->next)
  827.     {
  828.       if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
  829.         continue;

  831.       break;
  832.     }
  833.   if (sect == NULL)
  834.     return NULL;

  836.   low = bfd_get_section_vma (abfd, sect);
  837.   high = low + bfd_get_section_size (sect);

  839.   data = XCNEW (struct symfile_segment_data);
  840.   data->num_segments = 1;
  841.   data->segment_bases = XCNEW (CORE_ADDR);
  842.   data->segment_sizes = XCNEW (CORE_ADDR);

  844.   num_sections = bfd_count_sections (abfd);
  845.   data->segment_info = XCNEWVEC (int, num_sections);

  847.   for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
  848.     {
  849.       CORE_ADDR vma;

  851.       if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
  852.         continue;

  854.       vma = bfd_get_section_vma (abfd, sect);
  855.       if (vma < low)
  856.         low = vma;
  857.       if (vma + bfd_get_section_size (sect) > high)
  858.         high = vma + bfd_get_section_size (sect);

  860.       data->segment_info[i] = 1;
  861.     }

  863.   data->segment_bases[0] = low;
  864.   data->segment_sizes[0] = high - low;

  866.   return data;
  867. }

  869. /* This is a convenience function to call sym_read for OBJFILE and
  870.    possibly force the partial symbols to be read.  */

  872. static void
  873. ‌read_symbols (struct objfile *objfile, int add_flags)
  874. {
  875.   (*objfile->sf->sym_read) (objfile, add_flags);
  876.   objfile->per_bfd->minsyms_read = 1;

  878.   /* find_separate_debug_file_in_section should be called only if there is
  879.      single binary with no existing separate debug info file.  */
  880.   if (!objfile_has_partial_symbols (objfile)
  881.       && objfile->separate_debug_objfile == NULL
  882.       && objfile->separate_debug_objfile_backlink == NULL)
  883.     {
  884.       bfd *abfd = find_separate_debug_file_in_section (objfile);
  885.       struct cleanup *cleanup = make_cleanup_bfd_unref (abfd);

  887.       if (abfd != NULL)
  888.         {
  889.           /* find_separate_debug_file_in_section uses the same filename for the
  890.              virtual section-as-bfd like the bfd filename containing the
  891.              section.  Therefore use also non-canonical name form for the same
  892.              file containing the section.  */
  893.           symbol_file_add_separate (abfd, objfile->original_name, add_flags,
  894.                                     objfile);
  895.         }

  897.       do_cleanups (cleanup);
  898.     }
  899.   if ((add_flags & SYMFILE_NO_READ) == 0)
  900.     require_partial_symbols (objfile, 0);
  901. }

  903. /* Initialize entry point information for this objfile.  */

  905. static void
  906. ‌init_entry_point_info (struct objfile *objfile)
  907. {
  908.   struct entry_info *ei = &objfile->per_bfd->ei;

  910.   if (ei->initialized)
  911.     return;
  912.   ei->initialized = 1;

  914.   /* Save startup file's range of PC addresses to help blockframe.c
  915.      decide where the bottom of the stack is.  */

  917.   if (bfd_get_file_flags (objfile->obfd) & EXEC_P)
  918.     {
  919.       /* Executable file -- record its entry point so we'll recognize
  920.          the startup file because it contains the entry point.  */
  921.       ei->entry_point = bfd_get_start_address (objfile->obfd);
  922.       ei->entry_point_p = 1;
  923.     }
  924.   else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC
  925.            && bfd_get_start_address (objfile->obfd) != 0)
  926.     {
  927.       /* Some shared libraries may have entry points set and be
  928.          runnable.  There's no clear way to indicate this, so just check
  929.          for values other than zero.  */
  930.       ei->entry_point = bfd_get_start_address (objfile->obfd);
  931.       ei->entry_point_p = 1;
  932.     }
  933.   else
  934.     {
  935.       /* Examination of non-executable.o files.  Short-circuit this stuff.  */
  936.       ei->entry_point_p = 0;
  937.     }

  939.   if (ei->entry_point_p)
  940.     {
  941.       struct obj_section *osect;
  942.       CORE_ADDR entry_point =  ei->entry_point;
  943.       int found;

  945.       /* Make certain that the address points at real code, and not a
  946.          function descriptor.  */
  947.       entry_point
  948.         = gdbarch_convert_from_func_ptr_addr (get_objfile_arch (objfile),
  949.                                               entry_point,
  950.                                               &current_target);

  952.       /* Remove any ISA markers, so that this matches entries in the
  953.          symbol table.  */
  954.       ei->entry_point
  955.         = gdbarch_addr_bits_remove (get_objfile_arch (objfile), entry_point);

  957.       found = 0;
  958.       ALL_OBJFILE_OSECTIONS (objfile, osect)
  959.         {
  960.           struct bfd_section *sect = osect->the_bfd_section;

  962.           if (entry_point >= bfd_get_section_vma (objfile->obfd, sect)
  963.               && entry_point < (bfd_get_section_vma (objfile->obfd, sect)
  964.                                 + bfd_get_section_size (sect)))
  965.             {
  966.               ei->the_bfd_section_index
  967.                 = gdb_bfd_section_index (objfile->obfd, sect);
  968.               found = 1;
  969.               break;
  970.             }
  971.         }

  973.       if (!found)
  974.         ei->the_bfd_section_index = SECT_OFF_TEXT (objfile);
  975.     }
  976. }

  978. /* Process a symbol file, as either the main file or as a dynamically
  979.    loaded file.

  981.    This function does not set the OBJFILE's entry-point info.

  983.    OBJFILE is where the symbols are to be read from.

  985.    ADDRS is the list of section load addresses.  If the user has given
  986.    an 'add-symbol-file' command, then this is the list of offsets and
  987.    addresses he or she provided as arguments to the command; or, if
  988.    we're handling a shared library, these are the actual addresses the
  989.    sections are loaded at, according to the inferior's dynamic linker
  990.    (as gleaned by GDB's shared library code).  We convert each address
  991.    into an offset from the section VMA's as it appears in the object
  992.    file, and then call the file's sym_offsets function to convert this
  993.    into a format-specific offset table --- a `struct section_offsets'.

  995.    ADD_FLAGS encodes verbosity level, whether this is main symbol or
  996.    an extra symbol file such as dynamically loaded code, and wether
  997.    breakpoint reset should be deferred.  */

  999. static void
  1000. ‌syms_from_objfile_1 (struct objfile *objfile,
  1001.                      struct section_addr_info *addrs,
  1002.                      int add_flags)
  1003. {
  1004.   struct section_addr_info *local_addr = NULL;
  1005.   struct cleanup *old_chain;
  1006.   const int mainline = add_flags & SYMFILE_MAINLINE;

  1008.   objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd));

  1010.   if (objfile->sf == NULL)
  1011.     {
  1012.       /* No symbols to load, but we still need to make sure
  1013.          that the section_offsets table is allocated.  */
  1014.       int num_sections = gdb_bfd_count_sections (objfile->obfd);
  1015.       size_t size = SIZEOF_N_SECTION_OFFSETS (num_sections);

  1017.       objfile->num_sections = num_sections;
  1018.       objfile->section_offsets
  1019.         = obstack_alloc (&objfile->objfile_obstack, size);
  1020.       memset (objfile->section_offsets, 0, size);
  1021.       return;
  1022.     }

  1024.   /* Make sure that partially constructed symbol tables will be cleaned up
  1025.      if an error occurs during symbol reading.  */
  1026.   old_chain = make_cleanup_free_objfile (objfile);

  1028.   /* If ADDRS is NULL, put together a dummy address list.
  1029.      We now establish the convention that an addr of zero means
  1030.      no load address was specified.  */
  1031.   if (! addrs)
  1032.     {
  1033.       local_addr = alloc_section_addr_info (1);
  1034.       make_cleanup (xfree, local_addr);
  1035.       addrs = local_addr;
  1036.     }

  1038.   if (mainline)
  1039.     {
  1040.       /* We will modify the main symbol table, make sure that all its users
  1041.          will be cleaned up if an error occurs during symbol reading.  */
  1042.       make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/);

  1044.       /* Since no error yet, throw away the old symbol table.  */

  1046.       if (symfile_objfile != NULL)
  1047.         {
  1048.           free_objfile (symfile_objfile);
  1049.           gdb_assert (symfile_objfile == NULL);
  1050.         }

  1052.       /* Currently we keep symbols from the add-symbol-file command.
  1053.          If the user wants to get rid of them, they should do "symbol-file"
  1054.          without arguments first.  Not sure this is the best behavior
  1055.          (PR 2207).  */

  1057.       (*objfile->sf->sym_new_init) (objfile);
  1058.     }

  1060.   /* Convert addr into an offset rather than an absolute address.
  1061.      We find the lowest address of a loaded segment in the objfile,
  1062.      and assume that <addr> is where that got loaded.

  1064.      We no longer warn if the lowest section is not a text segment (as
  1065.      happens for the PA64 port.  */
  1066.   if (addrs->num_sections > 0)
  1067.     addr_info_make_relative (addrs, objfile->obfd);

  1069.   /* Initialize symbol reading routines for this objfile, allow complaints to
  1070.      appear for this new file, and record how verbose to be, then do the
  1071.      initial symbol reading for this file.  */

  1073.   (*objfile->sf->sym_init) (objfile);
  1074.   clear_complaints (&symfile_complaints, 1, add_flags & SYMFILE_VERBOSE);

  1076.   (*objfile->sf->sym_offsets) (objfile, addrs);

  1078.   read_symbols (objfile, add_flags);

  1080.   /* Discard cleanups as symbol reading was successful.  */

  1082.   discard_cleanups (old_chain);
  1083.   xfree (local_addr);
  1084. }

  1086. /* Same as syms_from_objfile_1, but also initializes the objfile
  1087.    entry-point info.  */

  1089. static void
  1090. ‌syms_from_objfile (struct objfile *objfile,
  1091.                    struct section_addr_info *addrs,
  1092.                    int add_flags)
  1093. {
  1094.   syms_from_objfile_1 (objfile, addrs, add_flags);
  1095.   init_entry_point_info (objfile);
  1096. }

  1098. /* Perform required actions after either reading in the initial
  1099.    symbols for a new objfile, or mapping in the symbols from a reusable
  1100.    objfile.  ADD_FLAGS is a bitmask of enum symfile_add_flags.  */

  1102. void
  1103. ‌new_symfile_objfile (struct objfile *objfile, int add_flags)
  1104. {
  1105.   /* If this is the main symbol file we have to clean up all users of the
  1106.      old main symbol file.  Otherwise it is sufficient to fixup all the
  1107.      breakpoints that may have been redefined by this symbol file.  */
  1108.   if (add_flags & SYMFILE_MAINLINE)
  1109.     {
  1110.       /* OK, make it the "real" symbol file.  */
  1111.       symfile_objfile = objfile;

  1113.       clear_symtab_users (add_flags);
  1114.     }
  1115.   else if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0)
  1116.     {
  1117.       breakpoint_re_set ();
  1118.     }

  1120.   /* We're done reading the symbol file; finish off complaints.  */
  1121.   clear_complaints (&symfile_complaints, 0, add_flags & SYMFILE_VERBOSE);
  1122. }

  1124. /* Process a symbol file, as either the main file or as a dynamically
  1125.    loaded file.

  1127.    ABFD is a BFD already open on the file, as from symfile_bfd_open.
  1128.    A new reference is acquired by this function.

  1130.    For NAME description see allocate_objfile's definition.

  1132.    ADD_FLAGS encodes verbosity, whether this is main symbol file or
  1133.    extra, such as dynamically loaded code, and what to do with breakpoins.

  1135.    ADDRS is as described for syms_from_objfile_1, above.
  1136.    ADDRS is ignored when SYMFILE_MAINLINE bit is set in ADD_FLAGS.

  1138.    PARENT is the original objfile if ABFD is a separate debug info file.
  1139.    Otherwise PARENT is NULL.

  1141.    Upon success, returns a pointer to the objfile that was added.
  1142.    Upon failure, jumps back to command level (never returns).  */

  1144. static struct objfile *
  1145. ‌symbol_file_add_with_addrs (bfd *abfd, const char *name, int add_flags,
  1146.                             struct section_addr_info *addrs,
  1147.                             int flags, struct objfile *parent)
  1148. {
  1149.   struct objfile *objfile;
  1150.   const int from_tty = add_flags & SYMFILE_VERBOSE;
  1151.   const int mainline = add_flags & SYMFILE_MAINLINE;
  1152.   const int should_print = (print_symbol_loading_p (from_tty, mainline, 1)
  1153.                             && (readnow_symbol_files
  1154.                                 || (add_flags & SYMFILE_NO_READ) == 0));

  1156.   if (readnow_symbol_files)
  1157.     {
  1158.       flags |= OBJF_READNOW;
  1159.       add_flags &= ~SYMFILE_NO_READ;
  1160.     }

  1162.   /* Give user a chance to burp if we'd be
  1163.      interactively wiping out any existing symbols.  */

  1165.   if ((have_full_symbols () || have_partial_symbols ())
  1166.       && mainline
  1167.       && from_tty
  1168.       && !query (_("Load new symbol table from \"%s\"? "), name))
  1169.     error (_("Not confirmed."));

  1171.   objfile = allocate_objfile (abfd, name,
  1172.                               flags | (mainline ? OBJF_MAINLINE : 0));

  1174.   if (parent)
  1175.     add_separate_debug_objfile (objfile, parent);

  1177.   /* We either created a new mapped symbol table, mapped an existing
  1178.      symbol table file which has not had initial symbol reading
  1179.      performed, or need to read an unmapped symbol table.  */
  1180.   if (should_print)
  1181.     {
  1182.       if (deprecated_pre_add_symbol_hook)
  1183.         deprecated_pre_add_symbol_hook (name);
  1184.       else
  1185.         {
  1186.           printf_unfiltered (_("Reading symbols from %s..."), name);
  1187.           wrap_here ("");
  1188.           gdb_flush (gdb_stdout);
  1189.         }
  1190.     }
  1191.   syms_from_objfile (objfile, addrs, add_flags);

  1193.   /* We now have at least a partial symbol table.  Check to see if the
  1194.      user requested that all symbols be read on initial access via either
  1195.      the gdb startup command line or on a per symbol file basis.  Expand
  1196.      all partial symbol tables for this objfile if so.  */

  1198.   if ((flags & OBJF_READNOW))
  1199.     {
  1200.       if (should_print)
  1201.         {
  1202.           printf_unfiltered (_("expanding to full symbols..."));
  1203.           wrap_here ("");
  1204.           gdb_flush (gdb_stdout);
  1205.         }

  1207.       if (objfile->sf)
  1208.         objfile->sf->qf->expand_all_symtabs (objfile);
  1209.     }

  1211.   if (should_print && !objfile_has_symbols (objfile))
  1212.     {
  1213.       wrap_here ("");
  1214.       printf_unfiltered (_("(no debugging symbols found)..."));
  1215.       wrap_here ("");
  1216.     }

  1218.   if (should_print)
  1219.     {
  1220.       if (deprecated_post_add_symbol_hook)
  1221.         deprecated_post_add_symbol_hook ();
  1222.       else
  1223.         printf_unfiltered (_("done.\n"));
  1224.     }

  1226.   /* We print some messages regardless of whether 'from_tty ||
  1227.      info_verbose' is true, so make sure they go out at the right
  1228.      time.  */
  1229.   gdb_flush (gdb_stdout);

  1231.   if (objfile->sf == NULL)
  1232.     {
  1233.       observer_notify_new_objfile (objfile);
  1234.       return objfile;        /* No symbols.  */
  1235.     }

  1237.   new_symfile_objfile (objfile, add_flags);

  1239.   observer_notify_new_objfile (objfile);

  1241.   bfd_cache_close_all ();
  1242.   return (objfile);
  1243. }

  1245. /* Add BFD as a separate debug file for OBJFILE.  For NAME description
  1246.    see allocate_objfile's definition.  */

  1248. void
  1249. ‌symbol_file_add_separate (bfd *bfd, const char *name, int symfile_flags,
  1250.                           struct objfile *objfile)
  1251. {
  1252.   struct objfile *new_objfile;
  1253.   struct section_addr_info *sap;
  1254.   struct cleanup *my_cleanup;

  1256.   /* Create section_addr_info.  We can't directly use offsets from OBJFILE
  1257.      because sections of BFD may not match sections of OBJFILE and because
  1258.      vma may have been modified by tools such as prelink.  */
  1259.   sap = build_section_addr_info_from_objfile (objfile);
  1260.   my_cleanup = make_cleanup_free_section_addr_info (sap);

  1262.   new_objfile = symbol_file_add_with_addrs
  1263.     (bfd, name, symfile_flags, sap,
  1264.      objfile->flags & (OBJF_REORDERED | OBJF_SHARED | OBJF_READNOW
  1265.                        | OBJF_USERLOADED),
  1266.      objfile);

  1268.   do_cleanups (my_cleanup);
  1269. }

  1271. /* Process the symbol file ABFD, as either the main file or as a
  1272.    dynamically loaded file.
  1273.    See symbol_file_add_with_addrs's comments for details.  */

  1275. struct objfile *
  1276. ‌symbol_file_add_from_bfd (bfd *abfd, const char *name, int add_flags,
  1277.                           struct section_addr_info *addrs,
  1278.                           int flags, struct objfile *parent)
  1279. {
  1280.   return symbol_file_add_with_addrs (abfd, name, add_flags, addrs, flags,
  1281.                                      parent);
  1282. }

  1284. /* Process a symbol file, as either the main file or as a dynamically
  1285.    loaded file.  See symbol_file_add_with_addrs's comments for details.  */

  1287. struct objfile *
  1288. ‌symbol_file_add (const char *name, int add_flags,
  1289.                  struct section_addr_info *addrs, int flags)
  1290. {
  1291.   bfd *bfd = symfile_bfd_open (name);
  1292.   struct cleanup *cleanup = make_cleanup_bfd_unref (bfd);
  1293.   struct objfile *objf;

  1295.   objf = symbol_file_add_from_bfd (bfd, name, add_flags, addrs, flags, NULL);
  1296.   do_cleanups (cleanup);
  1297.   return objf;
  1298. }

  1300. /* Call symbol_file_add() with default values and update whatever is
  1301.    affected by the loading of a new main().
  1302.    Used when the file is supplied in the gdb command line
  1303.    and by some targets with special loading requirements.
  1304.    The auxiliary function, symbol_file_add_main_1(), has the flags
  1305.    argument for the switches that can only be specified in the symbol_file
  1306.    command itself.  */

  1308. void
  1309. ‌symbol_file_add_main (const char *args, int from_tty)
  1310. {
  1311.   symbol_file_add_main_1 (args, from_tty, 0);
  1312. }

  1314. static void
  1315. ‌symbol_file_add_main_1 (const char *args, int from_tty, int flags)
  1316. {
  1317.   const int add_flags = (current_inferior ()->symfile_flags
  1318.                          | SYMFILE_MAINLINE | (from_tty ? SYMFILE_VERBOSE : 0));

  1320.   symbol_file_add (args, add_flags, NULL, flags);

  1322.   /* Getting new symbols may change our opinion about
  1323.      what is frameless.  */
  1324.   reinit_frame_cache ();

  1326.   if ((flags & SYMFILE_NO_READ) == 0)
  1327.     set_initial_language ();
  1328. }

  1330. void
  1331. ‌symbol_file_clear (int from_tty)
  1332. {
  1333.   if ((have_full_symbols () || have_partial_symbols ())
  1334.       && from_tty
  1335.       && (symfile_objfile
  1336.           ? !query (_("Discard symbol table from `%s'? "),
  1337.                     objfile_name (symfile_objfile))
  1338.           : !query (_("Discard symbol table? "))))
  1339.     error (_("Not confirmed."));

  1341.   /* solib descriptors may have handles to objfiles.  Wipe them before their
  1342.      objfiles get stale by free_all_objfiles.  */
  1343.   no_shared_libraries (NULL, from_tty);

  1345.   free_all_objfiles ();

  1347.   gdb_assert (symfile_objfile == NULL);
  1348.   if (from_tty)
  1349.     printf_unfiltered (_("No symbol file now.\n"));
  1350. }

  1352. static int
  1353. ‌separate_debug_file_exists (const char *name, unsigned long crc,
  1354.                             struct objfile *parent_objfile)
  1355. {
  1356.   unsigned long file_crc;
  1357.   int file_crc_p;
  1358.   bfd *abfd;
  1359.   struct stat parent_stat, abfd_stat;
  1360.   int verified_as_different;

  1362.   /* Find a separate debug info file as if symbols would be present in
  1363.      PARENT_OBJFILE itself this function would not be called.  .gnu_debuglink
  1364.      section can contain just the basename of PARENT_OBJFILE without any
  1365.      ".debug" suffix as "/usr/lib/debug/path/to/file" is a separate tree where
  1366.      the separate debug infos with the same basename can exist.  */

  1368.   if (filename_cmp (name, objfile_name (parent_objfile)) == 0)
  1369.     return 0;

  1371.   abfd = gdb_bfd_open_maybe_remote (name);

  1373.   if (!abfd)
  1374.     return 0;

  1376.   /* Verify symlinks were not the cause of filename_cmp name difference above.

  1378.      Some operating systems, e.g. Windows, do not provide a meaningful
  1379.      st_ino; they always set it to zero.  (Windows does provide a
  1380.      meaningful st_dev.)  Do not indicate a duplicate library in that
  1381.      case.  While there is no guarantee that a system that provides
  1382.      meaningful inode numbers will never set st_ino to zero, this is
  1383.      merely an optimization, so we do not need to worry about false
  1384.      negatives.  */

  1386.   if (bfd_stat (abfd, &abfd_stat) == 0
  1387.       && abfd_stat.st_ino != 0
  1388.       && bfd_stat (parent_objfile->obfd, &parent_stat) == 0)
  1389.     {
  1390.       if (abfd_stat.st_dev == parent_stat.st_dev
  1391.           && abfd_stat.st_ino == parent_stat.st_ino)
  1392.         {
  1393.           gdb_bfd_unref (abfd);
  1394.           return 0;
  1395.         }
  1396.       verified_as_different = 1;
  1397.     }
  1398.   else
  1399.     verified_as_different = 0;

  1401.   file_crc_p = gdb_bfd_crc (abfd, &file_crc);

  1403.   gdb_bfd_unref (abfd);

  1405.   if (!file_crc_p)
  1406.     return 0;

  1408.   if (crc != file_crc)
  1409.     {
  1410.       unsigned long parent_crc;

  1412.       /* If one (or both) the files are accessed for example the via "remote:"
  1413.          gdbserver way it does not support the bfd_stat operation.  Verify
  1414.          whether those two files are not the same manually.  */

  1416.       if (!verified_as_different)
  1417.         {
  1418.           if (!gdb_bfd_crc (parent_objfile->obfd, &parent_crc))
  1419.             return 0;
  1420.         }

  1422.       if (verified_as_different || parent_crc != file_crc)
  1423.         warning (_("the debug information found in \"%s\""
  1424.                    " does not match \"%s\" (CRC mismatch).\n"),
  1425.                  name, objfile_name (parent_objfile));

  1427.       return 0;
  1428.     }

  1430.   return 1;
  1431. }

  1433. ‌char *debug_file_directory = NULL;
  1434. static void
  1435. ‌show_debug_file_directory (struct ui_file *file, int from_tty,
  1436.                            struct cmd_list_element *c, const char *value)
  1437. {
  1438.   fprintf_filtered (file,
  1439.                     _("The directory where separate debug "
  1440.                       "symbols are searched for is \"%s\".\n"),
  1441.                     value);
  1442. }

  1444. #if ! defined (DEBUG_SUBDIRECTORY)
  1445. ‌#define DEBUG_SUBDIRECTORY ".debug"
  1446. #endif

  1448. /* Find a separate debuginfo file for OBJFILE, using DIR as the directory
  1449.    where the original file resides (may not be the same as
  1450.    dirname(objfile->name) due to symlinks), and DEBUGLINK as the file we are
  1451.    looking for.  CANON_DIR is the "realpath" form of DIR.
  1452.    DIR must contain a trailing '/'.
  1453.    Returns the path of the file with separate debug info, of NULL.  */

  1455. static char *
  1456. ‌find_separate_debug_file (const char *dir,
  1457.                           const char *canon_dir,
  1458.                           const char *debuglink,
  1459.                           unsigned long crc32, struct objfile *objfile)
  1460. {
  1461.   char *debugdir;
  1462.   char *debugfile;
  1463.   int i;
  1464.   VEC (char_ptr) *debugdir_vec;
  1465.   struct cleanup *back_to;
  1466.   int ix;

  1468.   /* Set I to max (strlen (canon_dir), strlen (dir)).  */
  1469.   i = strlen (dir);
  1470.   if (canon_dir != NULL && strlen (canon_dir) > i)
  1471.     i = strlen (canon_dir);

  1473.   debugfile = xmalloc (strlen (debug_file_directory) + 1
  1474.                        + i
  1475.                        + strlen (DEBUG_SUBDIRECTORY)
  1476.                        + strlen ("/")
  1477.                        + strlen (debuglink)
  1478.                        + 1);

  1480.   /* First try in the same directory as the original file.  */
  1481.   strcpy (debugfile, dir);
  1482.   strcat (debugfile, debuglink);

  1484.   if (separate_debug_file_exists (debugfile, crc32, objfile))
  1485.     return debugfile;

  1487.   /* Then try in the subdirectory named DEBUG_SUBDIRECTORY.  */
  1488.   strcpy (debugfile, dir);
  1489.   strcat (debugfile, DEBUG_SUBDIRECTORY);
  1490.   strcat (debugfile, "/");
  1491.   strcat (debugfile, debuglink);

  1493.   if (separate_debug_file_exists (debugfile, crc32, objfile))
  1494.     return debugfile;

  1496.   /* Then try in the global debugfile directories.

  1498.      Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
  1499.      cause "/..." lookups.  */

  1501.   debugdir_vec = dirnames_to_char_ptr_vec (debug_file_directory);
  1502.   back_to = make_cleanup_free_char_ptr_vec (debugdir_vec);

  1504.   for (ix = 0; VEC_iterate (char_ptr, debugdir_vec, ix, debugdir); ++ix)
  1505.     {
  1506.       strcpy (debugfile, debugdir);
  1507.       strcat (debugfile, "/");
  1508.       strcat (debugfile, dir);
  1509.       strcat (debugfile, debuglink);

  1511.       if (separate_debug_file_exists (debugfile, crc32, objfile))
  1512.         {
  1513.           do_cleanups (back_to);
  1514.           return debugfile;
  1515.         }

  1517.       /* If the file is in the sysroot, try using its base path in the
  1518.          global debugfile directory.  */
  1519.       if (canon_dir != NULL
  1520.           && filename_ncmp (canon_dir, gdb_sysroot,
  1521.                             strlen (gdb_sysroot)) == 0
  1522.           && IS_DIR_SEPARATOR (canon_dir[strlen (gdb_sysroot)]))
  1523.         {
  1524.           strcpy (debugfile, debugdir);
  1525.           strcat (debugfile, canon_dir + strlen (gdb_sysroot));
  1526.           strcat (debugfile, "/");
  1527.           strcat (debugfile, debuglink);

  1529.           if (separate_debug_file_exists (debugfile, crc32, objfile))
  1530.             {
  1531.               do_cleanups (back_to);
  1532.               return debugfile;
  1533.             }
  1534.         }
  1535.     }

  1537.   do_cleanups (back_to);
  1538.   xfree (debugfile);
  1539.   return NULL;
  1540. }

  1542. /* Modify PATH to contain only "[/]directory/" part of PATH.
  1543.    If there were no directory separators in PATH, PATH will be empty
  1544.    string on return.  */

  1546. static void
  1547. ‌terminate_after_last_dir_separator (char *path)
  1548. {
  1549.   int i;

  1551.   /* Strip off the final filename part, leaving the directory name,
  1552.      followed by a slash.  The directory can be relative or absolute.  */
  1553.   for (i = strlen(path) - 1; i >= 0; i--)
  1554.     if (IS_DIR_SEPARATOR (path[i]))
  1555.       break;

  1557.   /* If I is -1 then no directory is present there and DIR will be "".  */
  1558.   path[i + 1] = '\0';
  1559. }

  1561. /* Find separate debuginfo for OBJFILE (using .gnu_debuglink section).
  1562.    Returns pathname, or NULL.  */

  1564. char *
  1565. ‌find_separate_debug_file_by_debuglink (struct objfile *objfile)
  1566. {
  1567.   char *debuglink;
  1568.   char *dir, *canon_dir;
  1569.   char *debugfile;
  1570.   unsigned long crc32;
  1571.   struct cleanup *cleanups;

  1573.   debuglink = bfd_get_debug_link_info (objfile->obfd, &crc32);

  1575.   if (debuglink == NULL)
  1576.     {
  1577.       /* There's no separate debug info, hence there's no way we could
  1578.          load it => no warning.  */
  1579.       return NULL;
  1580.     }

  1582.   cleanups = make_cleanup (xfree, debuglink);
  1583.   dir = xstrdup (objfile_name (objfile));
  1584.   make_cleanup (xfree, dir);
  1585.   terminate_after_last_dir_separator (dir);
  1586.   canon_dir = lrealpath (dir);

  1588.   debugfile = find_separate_debug_file (dir, canon_dir, debuglink,
  1589.                                         crc32, objfile);
  1590.   xfree (canon_dir);

  1592.   if (debugfile == NULL)
  1593.     {
  1594.       /* For PR gdb/9538, try again with realpath (if different from the
  1595.          original).  */

  1597.       struct stat st_buf;

  1599.       if (lstat (objfile_name (objfile), &st_buf) == 0
  1600.           && S_ISLNK (st_buf.st_mode))
  1601.         {
  1602.           char *symlink_dir;

  1604.           symlink_dir = lrealpath (objfile_name (objfile));
  1605.           if (symlink_dir != NULL)
  1606.             {
  1607.               make_cleanup (xfree, symlink_dir);
  1608.               terminate_after_last_dir_separator (symlink_dir);
  1609.               if (strcmp (dir, symlink_dir) != 0)
  1610.                 {
  1611.                   /* Different directory, so try using it.  */
  1612.                   debugfile = find_separate_debug_file (symlink_dir,
  1613.                                                         symlink_dir,
  1614.                                                         debuglink,
  1615.                                                         crc32,
  1616.                                                         objfile);
  1617.                 }
  1618.             }
  1619.         }
  1620.     }

  1622.   do_cleanups (cleanups);
  1623.   return debugfile;
  1624. }

  1626. /* This is the symbol-file command.  Read the file, analyze its
  1627.    symbols, and add a struct symtab to a symtab list.  The syntax of
  1628.    the command is rather bizarre:

  1630.    1. The function buildargv implements various quoting conventions
  1631.    which are undocumented and have little or nothing in common with
  1632.    the way things are quoted (or not quoted) elsewhere in GDB.

  1634.    2. Options are used, which are not generally used in GDB (perhaps
  1635.    "set mapped on", "set readnow on" would be better)

  1637.    3. The order of options matters, which is contrary to GNU
  1638.    conventions (because it is confusing and inconvenient).  */

  1640. void
  1641. ‌symbol_file_command (char *args, int from_tty)
  1642. {
  1643.   dont_repeat ();

  1645.   if (args == NULL)
  1646.     {
  1647.       symbol_file_clear (from_tty);
  1648.     }
  1649.   else
  1650.     {
  1651.       char **argv = gdb_buildargv (args);
  1652.       int flags = OBJF_USERLOADED;
  1653.       struct cleanup *cleanups;
  1654.       char *name = NULL;

  1656.       cleanups = make_cleanup_freeargv (argv);
  1657.       while (*argv != NULL)
  1658.         {
  1659.           if (strcmp (*argv, "-readnow") == 0)
  1660.             flags |= OBJF_READNOW;
  1661.           else if (**argv == '-')
  1662.             error (_("unknown option `%s'"), *argv);
  1663.           else
  1664.             {
  1665.               symbol_file_add_main_1 (*argv, from_tty, flags);
  1666.               name = *argv;
  1667.             }

  1669.           argv++;
  1670.         }

  1672.       if (name == NULL)
  1673.         error (_("no symbol file name was specified"));

  1675.       do_cleanups (cleanups);
  1676.     }
  1677. }

  1679. /* Set the initial language.

  1681.    FIXME: A better solution would be to record the language in the
  1682.    psymtab when reading partial symbols, and then use it (if known) to
  1683.    set the language.  This would be a win for formats that encode the
  1684.    language in an easily discoverable place, such as DWARF.  For
  1685.    stabs, we can jump through hoops looking for specially named
  1686.    symbols or try to intuit the language from the specific type of
  1687.    stabs we find, but we can't do that until later when we read in
  1688.    full symbols.  */

  1690. void
  1691. ‌set_initial_language (void)
  1692. {
  1693.   enum language lang = main_language ();

  1695.   if (lang == language_unknown)
  1696.     {
  1697.       char *name = main_name ();
  1698.       struct symbol *sym = lookup_symbol (name, NULL, VAR_DOMAIN, NULL);

  1700.       if (sym != NULL)
  1701.         lang = SYMBOL_LANGUAGE (sym);
  1702.     }

  1704.   if (lang == language_unknown)
  1705.     {
  1706.       /* Make C the default language */
  1707.       lang = language_c;
  1708.     }

  1710.   set_language (lang);
  1711.   expected_language = current_language; /* Don't warn the user.  */
  1712. }

  1714. /* If NAME is a remote name open the file using remote protocol, otherwise
  1715.    open it normally.  Returns a new reference to the BFD.  On error,
  1716.    returns NULL with the BFD error set.  */

  1718. bfd *
  1719. ‌gdb_bfd_open_maybe_remote (const char *name)
  1720. {
  1721.   bfd *result;

  1723.   if (remote_filename_p (name))
  1724.     result = remote_bfd_open (name, gnutarget);
  1725.   else
  1726.     result = gdb_bfd_open (name, gnutarget, -1);

  1728.   return result;
  1729. }

  1731. /* Open the file specified by NAME and hand it off to BFD for
  1732.    preliminary analysis.  Return a newly initialized bfd *, which
  1733.    includes a newly malloc'd` copy of NAME (tilde-expanded and made
  1734.    absolute).  In case of trouble, error() is called.  */

  1736. bfd *
  1737. ‌symfile_bfd_open (const char *cname)
  1738. {
  1739.   bfd *sym_bfd;
  1740.   int desc;
  1741.   char *name, *absolute_name;
  1742.   struct cleanup *back_to;

  1744.   if (remote_filename_p (cname))
  1745.     {
  1746.       sym_bfd = remote_bfd_open (cname, gnutarget);
  1747.       if (!sym_bfd)
  1748.         error (_("`%s': can't open to read symbols: %s."), cname,
  1749.                bfd_errmsg (bfd_get_error ()));

  1751.       if (!bfd_check_format (sym_bfd, bfd_object))
  1752.         {
  1753.           make_cleanup_bfd_unref (sym_bfd);
  1754.           error (_("`%s': can't read symbols: %s."), cname,
  1755.                  bfd_errmsg (bfd_get_error ()));
  1756.         }

  1758.       return sym_bfd;
  1759.     }

  1761.   name = tilde_expand (cname);        /* Returns 1st new malloc'd copy.  */

  1763.   /* Look down path for it, allocate 2nd new malloc'd copy.  */
  1764.   desc = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, name,
  1765.                 O_RDONLY | O_BINARY, &absolute_name);
  1766. #if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__)
  1767.   if (desc < 0)
  1768.     {
  1769.       char *exename = alloca (strlen (name) + 5);

  1771.       strcat (strcpy (exename, name), ".exe");
  1772.       desc = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH,
  1773.                     exename, O_RDONLY | O_BINARY, &absolute_name);
  1774.     }
  1775. #endif
  1776.   if (desc < 0)
  1777.     {
  1778.       make_cleanup (xfree, name);
  1779.       perror_with_name (name);
  1780.     }

  1782.   xfree (name);
  1783.   name = absolute_name;
  1784.   back_to = make_cleanup (xfree, name);

  1786.   sym_bfd = gdb_bfd_open (name, gnutarget, desc);
  1787.   if (!sym_bfd)
  1788.     error (_("`%s': can't open to read symbols: %s."), name,
  1789.            bfd_errmsg (bfd_get_error ()));
  1790.   bfd_set_cacheable (sym_bfd, 1);

  1792.   if (!bfd_check_format (sym_bfd, bfd_object))
  1793.     {
  1794.       make_cleanup_bfd_unref (sym_bfd);
  1795.       error (_("`%s': can't read symbols: %s."), name,
  1796.              bfd_errmsg (bfd_get_error ()));
  1797.     }

  1799.   do_cleanups (back_to);

  1801.   return sym_bfd;
  1802. }

  1804. /* Return the section index for SECTION_NAME on OBJFILE.  Return -1 if
  1805.    the section was not found.  */

  1807. int
  1808. ‌get_section_index (struct objfile *objfile, char *section_name)
  1809. {
  1810.   asection *sect = bfd_get_section_by_name (objfile->obfd, section_name);

  1812.   if (sect)
  1813.     return sect->index;
  1814.   else
  1815.     return -1;
  1816. }

  1818. /* Link SF into the global symtab_fns list.
  1819.    FLAVOUR is the file format that SF handles.
  1820.    Called on startup by the _initialize routine in each object file format
  1821.    reader, to register information about each format the reader is prepared
  1822.    to handle.  */

  1824. void
  1825. ‌add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *sf)
  1826. {
  1827.   registered_sym_fns fns = { flavour, sf };

  1829.   VEC_safe_push (registered_sym_fns, symtab_fns, &fns);
  1830. }

  1832. /* Initialize OBJFILE to read symbols from its associated BFD.  It
  1833.    either returns or calls error().  The result is an initialized
  1834.    struct sym_fns in the objfile structure, that contains cached
  1835.    information about the symbol file.  */

  1837. static const struct sym_fns *
  1838. ‌find_sym_fns (bfd *abfd)
  1839. {
  1840.   registered_sym_fns *rsf;
  1841.   enum bfd_flavour our_flavour = bfd_get_flavour (abfd);
  1842.   int i;

  1844.   if (our_flavour == bfd_target_srec_flavour
  1845.       || our_flavour == bfd_target_ihex_flavour
  1846.       || our_flavour == bfd_target_tekhex_flavour)
  1847.     return NULL;        /* No symbols.  */

  1849.   for (i = 0; VEC_iterate (registered_sym_fns, symtab_fns, i, rsf); ++i)
  1850.     if (our_flavour == rsf->sym_flavour)
  1851.       return rsf->sym_fns;

  1853.   error (_("I'm sorry, Dave, I can't do that.  Symbol format `%s' unknown."),
  1854.          bfd_get_target (abfd));
  1855. }


  1858. /* This function runs the load command of our current target.  */

  1860. static void
  1861. ‌load_command (char *arg, int from_tty)
  1862. {
  1863.   struct cleanup *cleanup = make_cleanup (null_cleanup, NULL);

  1865.   dont_repeat ();

  1867.   /* The user might be reloading because the binary has changed.  Take
  1868.      this opportunity to check.  */
  1869.   reopen_exec_file ();
  1870.   reread_symbols ();

  1872.   if (arg == NULL)
  1873.     {
  1874.       char *parg;
  1875.       int count = 0;

  1877.       parg = arg = get_exec_file (1);

  1879.       /* Count how many \ " ' tab space there are in the name.  */
  1880.       while ((parg = strpbrk (parg, "\\\"'\t ")))
  1881.         {
  1882.           parg++;
  1883.           count++;
  1884.         }

  1886.       if (count)
  1887.         {
  1888.           /* We need to quote this string so buildargv can pull it apart.  */
  1889.           char *temp = xmalloc (strlen (arg) + count + 1 );
  1890.           char *ptemp = temp;
  1891.           char *prev;

  1893.           make_cleanup (xfree, temp);

  1895.           prev = parg = arg;
  1896.           while ((parg = strpbrk (parg, "\\\"'\t ")))
  1897.             {
  1898.               strncpy (ptemp, prev, parg - prev);
  1899.               ptemp += parg - prev;
  1900.               prev = parg++;
  1901.               *ptemp++ = '\\';
  1902.             }
  1903.           strcpy (ptemp, prev);

  1905.           arg = temp;
  1906.         }
  1907.     }

  1909.   target_load (arg, from_tty);

  1911.   /* After re-loading the executable, we don't really know which
  1912.      overlays are mapped any more.  */
  1913.   overlay_cache_invalid = 1;

  1915.   do_cleanups (cleanup);
  1916. }

  1918. /* This version of "load" should be usable for any target.  Currently
  1919.    it is just used for remote targets, not inftarg.c or core files,
  1920.    on the theory that only in that case is it useful.

  1922.    Avoiding xmodem and the like seems like a win (a) because we don't have
  1923.    to worry about finding it, and (b) On VMS, fork() is very slow and so
  1924.    we don't want to run a subprocess.  On the other hand, I'm not sure how
  1925.    performance compares.  */

  1927. ‌static int validate_download = 0;

  1929. /* Callback service function for generic_load (bfd_map_over_sections).  */

  1931. static void
  1932. ‌add_section_size_callback (bfd *abfd, asection *asec, void *data)
  1933. {
  1934.   bfd_size_type *sum = data;

  1936.   *sum += bfd_get_section_size (asec);
  1937. }

  1939. /* Opaque data for load_section_callback.  */
  1940. ‌struct load_section_data {
  1941.   CORE_ADDR load_offset;
  1942.   struct load_progress_data *progress_data;
  1943.   VEC(memory_write_request_s) *requests;
  1944. };

  1946. /* Opaque data for load_progress.  */
  1947. ‌struct load_progress_data {
  1948.   /* Cumulative data.  */
  1949.   unsigned long write_count;
  1950.   unsigned long data_count;
  1951.   bfd_size_type total_size;
  1952. };

  1954. /* Opaque data for load_progress for a single section.  */
  1955. ‌struct load_progress_section_data {
  1956.   struct load_progress_data *cumulative;

  1958.   /* Per-section data.  */
  1959.   const char *section_name;
  1960.   ULONGEST section_sent;
  1961.   ULONGEST section_size;
  1962.   CORE_ADDR lma;
  1963.   gdb_byte *buffer;
  1964. };

  1966. /* Target write callback routine for progress reporting.  */

  1968. static void
  1969. ‌load_progress (ULONGEST bytes, void *untyped_arg)
  1970. {
  1971.   struct load_progress_section_data *args = untyped_arg;
  1972.   struct load_progress_data *totals;

  1974.   if (args == NULL)
  1975.     /* Writing padding data.  No easy way to get at the cumulative
  1976.        stats, so just ignore this.  */
  1977.     return;

  1979.   totals = args->cumulative;

  1981.   if (bytes == 0 && args->section_sent == 0)
  1982.     {
  1983.       /* The write is just starting.  Let the user know we've started
  1984.          this section.  */
  1985.       ui_out_message (current_uiout, 0, "Loading section %s, size %s lma %s\n",
  1986.                       args->section_name, hex_string (args->section_size),
  1987.                       paddress (target_gdbarch (), args->lma));
  1988.       return;
  1989.     }

  1991.   if (validate_download)
  1992.     {
  1993.       /* Broken memories and broken monitors manifest themselves here
  1994.          when bring new computers to life.  This doubles already slow
  1995.          downloads.  */
  1996.       /* NOTE: cagney/1999-10-18: A more efficient implementation
  1997.          might add a verify_memory() method to the target vector and
  1998.          then use that.  remote.c could implement that method using
  1999.          the ``qCRC'' packet.  */
  2000.       gdb_byte *check = xmalloc (bytes);
  2001.       struct cleanup *verify_cleanups = make_cleanup (xfree, check);

  2003.       if (target_read_memory (args->lma, check, bytes) != 0)
  2004.         error (_("Download verify read failed at %s"),
  2005.                paddress (target_gdbarch (), args->lma));
  2006.       if (memcmp (args->buffer, check, bytes) != 0)
  2007.         error (_("Download verify compare failed at %s"),
  2008.                paddress (target_gdbarch (), args->lma));
  2009.       do_cleanups (verify_cleanups);
  2010.     }
  2011.   totals->data_count += bytes;
  2012.   args->lma += bytes;
  2013.   args->buffer += bytes;
  2014.   totals->write_count += 1;
  2015.   args->section_sent += bytes;
  2016.   if (check_quit_flag ()
  2017.       || (deprecated_ui_load_progress_hook != NULL
  2018.           && deprecated_ui_load_progress_hook (args->section_name,
  2019.                                                args->section_sent)))
  2020.     error (_("Canceled the download"));

  2022.   if (deprecated_show_load_progress != NULL)
  2023.     deprecated_show_load_progress (args->section_name,
  2024.                                    args->section_sent,
  2025.                                    args->section_size,
  2026.                                    totals->data_count,
  2027.                                    totals->total_size);
  2028. }

  2030. /* Callback service function for generic_load (bfd_map_over_sections).  */

  2032. static void
  2033. ‌load_section_callback (bfd *abfd, asection *asec, void *data)
  2034. {
  2035.   struct memory_write_request *new_request;
  2036.   struct load_section_data *args = data;
  2037.   struct load_progress_section_data *section_data;
  2038.   bfd_size_type size = bfd_get_section_size (asec);
  2039.   gdb_byte *buffer;
  2040.   const char *sect_name = bfd_get_section_name (abfd, asec);

  2042.   if ((bfd_get_section_flags (abfd, asec) & SEC_LOAD) == 0)
  2043.     return;

  2045.   if (size == 0)
  2046.     return;

  2048.   new_request = VEC_safe_push (memory_write_request_s,
  2049.                                args->requests, NULL);
  2050.   memset (new_request, 0, sizeof (struct memory_write_request));
  2051.   section_data = xcalloc (1, sizeof (struct load_progress_section_data));
  2052.   new_request->begin = bfd_section_lma (abfd, asec) + args->load_offset;
  2053.   new_request->end = new_request->begin + size; /* FIXME Should size
  2054.                                                    be in instead?  */
  2055.   new_request->data = xmalloc (size);
  2056.   new_request->baton = section_data;

  2058.   buffer = new_request->data;

  2060.   section_data->cumulative = args->progress_data;
  2061.   section_data->section_name = sect_name;
  2062.   section_data->section_size = size;
  2063.   section_data->lma = new_request->begin;
  2064.   section_data->buffer = buffer;

  2066.   bfd_get_section_contents (abfd, asec, buffer, 0, size);
  2067. }

  2069. /* Clean up an entire memory request vector, including load
  2070.    data and progress records.  */

  2072. static void
  2073. ‌clear_memory_write_data (void *arg)
  2074. {
  2075.   VEC(memory_write_request_s) **vec_p = arg;
  2076.   VEC(memory_write_request_s) *vec = *vec_p;
  2077.   int i;
  2078.   struct memory_write_request *mr;

  2080.   for (i = 0; VEC_iterate (memory_write_request_s, vec, i, mr); ++i)
  2081.     {
  2082.       xfree (mr->data);
  2083.       xfree (mr->baton);
  2084.     }
  2085.   VEC_free (memory_write_request_s, vec);
  2086. }

  2088. void
  2089. ‌generic_load (const char *args, int from_tty)
  2090. {
  2091.   bfd *loadfile_bfd;
  2092.   struct timeval start_time, end_time;
  2093.   char *filename;
  2094.   struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0);
  2095.   struct load_section_data cbdata;
  2096.   struct load_progress_data total_progress;
  2097.   struct ui_out *uiout = current_uiout;

  2099.   CORE_ADDR entry;
  2100.   char **argv;

  2102.   memset (&cbdata, 0, sizeof (cbdata));
  2103.   memset (&total_progress, 0, sizeof (total_progress));
  2104.   cbdata.progress_data = &total_progress;

  2106.   make_cleanup (clear_memory_write_data, &cbdata.requests);

  2108.   if (args == NULL)
  2109.     error_no_arg (_("file to load"));

  2111.   argv = gdb_buildargv (args);
  2112.   make_cleanup_freeargv (argv);

  2114.   filename = tilde_expand (argv[0]);
  2115.   make_cleanup (xfree, filename);

  2117.   if (argv[1] != NULL)
  2118.     {
  2119.       const char *endptr;

  2121.       cbdata.load_offset = strtoulst (argv[1], &endptr, 0);

  2123.       /* If the last word was not a valid number then
  2124.          treat it as a file name with spaces in.  */
  2125.       if (argv[1] == endptr)
  2126.         error (_("Invalid download offset:%s."), argv[1]);

  2128.       if (argv[2] != NULL)
  2129.         error (_("Too many parameters."));
  2130.     }

  2132.   /* Open the file for loading.  */
  2133.   loadfile_bfd = gdb_bfd_open (filename, gnutarget, -1);
  2134.   if (loadfile_bfd == NULL)
  2135.     {
  2136.       perror_with_name (filename);
  2137.       return;
  2138.     }

  2140.   make_cleanup_bfd_unref (loadfile_bfd);

  2142.   if (!bfd_check_format (loadfile_bfd, bfd_object))
  2143.     {
  2144.       error (_("\"%s\" is not an object file: %s"), filename,
  2145.              bfd_errmsg (bfd_get_error ()));
  2146.     }

  2148.   bfd_map_over_sections (loadfile_bfd, add_section_size_callback,
  2149.                          (void *) &total_progress.total_size);

  2151.   bfd_map_over_sections (loadfile_bfd, load_section_callback, &cbdata);

  2153.   gettimeofday (&start_time, NULL);

  2155.   if (target_write_memory_blocks (cbdata.requests, flash_discard,
  2156.                                   load_progress) != 0)
  2157.     error (_("Load failed"));

  2159.   gettimeofday (&end_time, NULL);

  2161.   entry = bfd_get_start_address (loadfile_bfd);
  2162.   entry = gdbarch_addr_bits_remove (target_gdbarch (), entry);
  2163.   ui_out_text (uiout, "Start address ");
  2164.   ui_out_field_fmt (uiout, "address", "%s", paddress (target_gdbarch (), entry));
  2165.   ui_out_text (uiout, ", load size ");
  2166.   ui_out_field_fmt (uiout, "load-size", "%lu", total_progress.data_count);
  2167.   ui_out_text (uiout, "\n");
  2168.   /* We were doing this in remote-mips.c, I suspect it is right
  2169.      for other targets too.  */
  2170.   regcache_write_pc (get_current_regcache (), entry);

  2172.   /* Reset breakpoints, now that we have changed the load image.  For
  2173.      instance, breakpoints may have been set (or reset, by
  2174.      post_create_inferior) while connected to the target but before we
  2175.      loaded the program.  In that case, the prologue analyzer could
  2176.      have read instructions from the target to find the right
  2177.      breakpoint locations.  Loading has changed the contents of that
  2178.      memory.  */

  2180.   breakpoint_re_set ();

  2182.   /* FIXME: are we supposed to call symbol_file_add or not?  According
  2183.      to a comment from remote-mips.c (where a call to symbol_file_add
  2184.      was commented out), making the call confuses GDB if more than one
  2185.      file is loaded in.  Some targets do (e.g., remote-vx.c) but
  2186.      others don't (or didn't - perhaps they have all been deleted).  */

  2188.   print_transfer_performance (gdb_stdout, total_progress.data_count,
  2189.                               total_progress.write_count,
  2190.                               &start_time, &end_time);

  2192.   do_cleanups (old_cleanups);
  2193. }

  2195. /* Report how fast the transfer went.  */

  2197. void
  2198. ‌print_transfer_performance (struct ui_file *stream,
  2199.                             unsigned long data_count,
  2200.                             unsigned long write_count,
  2201.                             const struct timeval *start_time,
  2202.                             const struct timeval *end_time)
  2203. {
  2204.   ULONGEST time_count;
  2205.   struct ui_out *uiout = current_uiout;

  2207.   /* Compute the elapsed time in milliseconds, as a tradeoff between
  2208.      accuracy and overflow.  */
  2209.   time_count = (end_time->tv_sec - start_time->tv_sec) * 1000;
  2210.   time_count += (end_time->tv_usec - start_time->tv_usec) / 1000;

  2212.   ui_out_text (uiout, "Transfer rate: ");
  2213.   if (time_count > 0)
  2214.     {
  2215.       unsigned long rate = ((ULONGEST) data_count * 1000) / time_count;

  2217.       if (ui_out_is_mi_like_p (uiout))
  2218.         {
  2219.           ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate * 8);
  2220.           ui_out_text (uiout, " bits/sec");
  2221.         }
  2222.       else if (rate < 1024)
  2223.         {
  2224.           ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate);
  2225.           ui_out_text (uiout, " bytes/sec");
  2226.         }
  2227.       else
  2228.         {
  2229.           ui_out_field_fmt (uiout, "transfer-rate", "%lu", rate / 1024);
  2230.           ui_out_text (uiout, " KB/sec");
  2231.         }
  2232.     }
  2233.   else
  2234.     {
  2235.       ui_out_field_fmt (uiout, "transferred-bits", "%lu", (data_count * 8));
  2236.       ui_out_text (uiout, " bits in <1 sec");
  2237.     }
  2238.   if (write_count > 0)
  2239.     {
  2240.       ui_out_text (uiout, ", ");
  2241.       ui_out_field_fmt (uiout, "write-rate", "%lu", data_count / write_count);
  2242.       ui_out_text (uiout, " bytes/write");
  2243.     }
  2244.   ui_out_text (uiout, ".\n");
  2245. }

  2247. /* This function allows the addition of incrementally linked object files.
  2248.    It does not modify any state in the target, only in the debugger.  */
  2249. /* Note: ezannoni 2000-04-13 This function/command used to have a
  2250.    special case syntax for the rombug target (Rombug is the boot
  2251.    monitor for Microware's OS-9 / OS-9000, see remote-os9k.c). In the
  2252.    rombug case, the user doesn't need to supply a text address,
  2253.    instead a call to target_link() (in target.c) would supply the
  2254.    value to use.  We are now discontinuing this type of ad hoc syntax.  */

  2256. static void
  2257. ‌add_symbol_file_command (char *args, int from_tty)
  2258. {
  2259.   struct gdbarch *gdbarch = get_current_arch ();
  2260.   char *filename = NULL;
  2261.   int flags = OBJF_USERLOADED | OBJF_SHARED;
  2262.   char *arg;
  2263.   int section_index = 0;
  2264.   int argcnt = 0;
  2265.   int sec_num = 0;
  2266.   int i;
  2267.   int expecting_sec_name = 0;
  2268.   int expecting_sec_addr = 0;
  2269.   char **argv;
  2270.   struct objfile *objf;

  2272.   struct sect_opt
  2273.   {
  2274.     char *name;
  2275.     char *value;
  2276.   };

  2278.   struct section_addr_info *section_addrs;
  2279.   struct sect_opt *sect_opts = NULL;
  2280.   size_t num_sect_opts = 0;
  2281.   struct cleanup *my_cleanups = make_cleanup (null_cleanup, NULL);

  2283.   num_sect_opts = 16;
  2284.   sect_opts = (struct sect_opt *) xmalloc (num_sect_opts
  2285.                                            * sizeof (struct sect_opt));

  2287.   dont_repeat ();

  2289.   if (args == NULL)
  2290.     error (_("add-symbol-file takes a file name and an address"));

  2292.   argv = gdb_buildargv (args);
  2293.   make_cleanup_freeargv (argv);

  2295.   for (arg = argv[0], argcnt = 0; arg != NULL; arg = argv[++argcnt])
  2296.     {
  2297.       /* Process the argument.  */
  2298.       if (argcnt == 0)
  2299.         {
  2300.           /* The first argument is the file name.  */
  2301.           filename = tilde_expand (arg);
  2302.           make_cleanup (xfree, filename);
  2303.         }
  2304.       else if (argcnt == 1)
  2305.         {
  2306.           /* The second argument is always the text address at which
  2307.              to load the program.  */
  2308.           sect_opts[section_index].name = ".text";
  2309.           sect_opts[section_index].value = arg;
  2310.           if (++section_index >= num_sect_opts)
  2311.             {
  2312.               num_sect_opts *= 2;
  2313.               sect_opts = ((struct sect_opt *)
  2314.                            xrealloc (sect_opts,
  2315.                                      num_sect_opts
  2316.                                      * sizeof (struct sect_opt)));
  2317.             }
  2318.         }
  2319.       else
  2320.         {
  2321.           /* It's an option (starting with '-') or it's an argument
  2322.              to an option.  */
  2323.           if (expecting_sec_name)
  2324.             {
  2325.               sect_opts[section_index].name = arg;
  2326.               expecting_sec_name = 0;
  2327.             }
  2328.           else if (expecting_sec_addr)
  2329.             {
  2330.               sect_opts[section_index].value = arg;
  2331.               expecting_sec_addr = 0;
  2332.               if (++section_index >= num_sect_opts)
  2333.                 {
  2334.                   num_sect_opts *= 2;
  2335.                   sect_opts = ((struct sect_opt *)
  2336.                                xrealloc (sect_opts,
  2337.                                          num_sect_opts
  2338.                                          * sizeof (struct sect_opt)));
  2339.                 }
  2340.             }
  2341.           else if (strcmp (arg, "-readnow") == 0)
  2342.             flags |= OBJF_READNOW;
  2343.           else if (strcmp (arg, "-s") == 0)
  2344.             {
  2345.               expecting_sec_name = 1;
  2346.               expecting_sec_addr = 1;
  2347.             }
  2348.           else
  2349.             error (_("USAGE: add-symbol-file <filename> <textaddress>"
  2350.                      " [-readnow] [-s <secname> <addr>]*"));
  2351.         }
  2352.     }

  2354.   /* This command takes at least two arguments.  The first one is a
  2355.      filename, and the second is the address where this file has been
  2356.      loaded.  Abort now if this address hasn't been provided by the
  2357.      user.  */
  2358.   if (section_index < 1)
  2359.     error (_("The address where %s has been loaded is missing"), filename);

  2361.   /* Print the prompt for the query below.  And save the arguments into
  2362.      a sect_addr_info structure to be passed around to other
  2363.      functions.  We have to split this up into separate print
  2364.      statements because hex_string returns a local static
  2365.      string.  */

  2367.   printf_unfiltered (_("add symbol table from file \"%s\" at\n"), filename);
  2368.   section_addrs = alloc_section_addr_info (section_index);
  2369.   make_cleanup (xfree, section_addrs);
  2370.   for (i = 0; i < section_index; i++)
  2371.     {
  2372.       CORE_ADDR addr;
  2373.       char *val = sect_opts[i].value;
  2374.       char *sec = sect_opts[i].name;

  2376.       addr = parse_and_eval_address (val);

  2378.       /* Here we store the section offsets in the order they were
  2379.          entered on the command line.  */
  2380.       section_addrs->other[sec_num].name = sec;
  2381.       section_addrs->other[sec_num].addr = addr;
  2382.       printf_unfiltered ("\t%s_addr = %s\n", sec,
  2383.                          paddress (gdbarch, addr));
  2384.       sec_num++;

  2386.       /* The object's sections are initialized when a
  2387.          call is made to build_objfile_section_table (objfile).
  2388.          This happens in reread_symbols.
  2389.          At this point, we don't know what file type this is,
  2390.          so we can't determine what section names are valid.  */
  2391.     }
  2392.   section_addrs->num_sections = sec_num;

  2394.   if (from_tty && (!query ("%s", "")))
  2395.     error (_("Not confirmed."));

  2397.   objf = symbol_file_add (filename, from_tty ? SYMFILE_VERBOSE : 0,
  2398.                           section_addrs, flags);

  2400.   add_target_sections_of_objfile (objf);

  2402.   /* Getting new symbols may change our opinion about what is
  2403.      frameless.  */
  2404.   reinit_frame_cache ();
  2405.   do_cleanups (my_cleanups);
  2406. }


  2409. /* This function removes a symbol file that was added via add-symbol-file.  */

  2411. static void
  2412. ‌remove_symbol_file_command (char *args, int from_tty)
  2413. {
  2414.   char **argv;
  2415.   struct objfile *objf = NULL;
  2416.   struct cleanup *my_cleanups;
  2417.   struct program_space *pspace = current_program_space;
  2418.   struct gdbarch *gdbarch = get_current_arch ();

  2420.   dont_repeat ();

  2422.   if (args == NULL)
  2423.     error (_("remove-symbol-file: no symbol file provided"));

  2425.   my_cleanups = make_cleanup (null_cleanup, NULL);

  2427.   argv = gdb_buildargv (args);

  2429.   if (strcmp (argv[0], "-a") == 0)
  2430.     {
  2431.       /* Interpret the next argument as an address.  */
  2432.       CORE_ADDR addr;

  2434.       if (argv[1] == NULL)
  2435.         error (_("Missing address argument"));

  2437.       if (argv[2] != NULL)
  2438.         error (_("Junk after %s"), argv[1]);

  2440.       addr = parse_and_eval_address (argv[1]);

  2442.       ALL_OBJFILES (objf)
  2443.         {
  2444.           if ((objf->flags & OBJF_USERLOADED) != 0
  2445.               && (objf->flags & OBJF_SHARED) != 0
  2446.               && objf->pspace == pspace && is_addr_in_objfile (addr, objf))
  2447.             break;
  2448.         }
  2449.     }
  2450.   else if (argv[0] != NULL)
  2451.     {
  2452.       /* Interpret the current argument as a file name.  */
  2453.       char *filename;

  2455.       if (argv[1] != NULL)
  2456.         error (_("Junk after %s"), argv[0]);

  2458.       filename = tilde_expand (argv[0]);
  2459.       make_cleanup (xfree, filename);

  2461.       ALL_OBJFILES (objf)
  2462.         {
  2463.           if ((objf->flags & OBJF_USERLOADED) != 0
  2464.               && (objf->flags & OBJF_SHARED) != 0
  2465.               && objf->pspace == pspace
  2466.               && filename_cmp (filename, objfile_name (objf)) == 0)
  2467.             break;
  2468.         }
  2469.     }

  2471.   if (objf == NULL)
  2472.     error (_("No symbol file found"));

  2474.   if (from_tty
  2475.       && !query (_("Remove symbol table from file \"%s\"? "),
  2476.                  objfile_name (objf)))
  2477.     error (_("Not confirmed."));

  2479.   free_objfile (objf);
  2480.   clear_symtab_users (0);

  2482.   do_cleanups (my_cleanups);
  2483. }

  2485. ‌typedef struct objfile *objfilep;

  2487. ‌DEF_VEC_P (objfilep);

  2489. /* Re-read symbols if a symbol-file has changed.  */

  2491. void
  2492. ‌reread_symbols (void)
  2493. {
  2494.   struct objfile *objfile;
  2495.   long new_modtime;
  2496.   struct stat new_statbuf;
  2497.   int res;
  2498.   VEC (objfilep) *new_objfiles = NULL;
  2499.   struct cleanup *all_cleanups;

  2501.   all_cleanups = make_cleanup (VEC_cleanup (objfilep), &new_objfiles);

  2503.   /* With the addition of shared libraries, this should be modified,
  2504.      the load time should be saved in the partial symbol tables, since
  2505.      different tables may come from different source files.  FIXME.
  2506.      This routine should then walk down each partial symbol table
  2507.      and see if the symbol table that it originates from has been changed.  */

  2509.   for (objfile = object_files; objfile; objfile = objfile->next)
  2510.     {
  2511.       if (objfile->obfd == NULL)
  2512.         continue;

  2514.       /* Separate debug objfiles are handled in the main objfile.  */
  2515.       if (objfile->separate_debug_objfile_backlink)
  2516.         continue;

  2518.       /* If this object is from an archive (what you usually create with
  2519.          `ar', often called a `static library' on most systems, though
  2520.          a `shared library' on AIX is also an archive), then you should
  2521.          stat on the archive name, not member name.  */
  2522.       if (objfile->obfd->my_archive)
  2523.         res = stat (objfile->obfd->my_archive->filename, &new_statbuf);
  2524.       else
  2525.         res = stat (objfile_name (objfile), &new_statbuf);
  2526.       if (res != 0)
  2527.         {
  2528.           /* FIXME, should use print_sys_errmsg but it's not filtered.  */
  2529.           printf_unfiltered (_("`%s' has disappeared; keeping its symbols.\n"),
  2530.                              objfile_name (objfile));
  2531.           continue;
  2532.         }
  2533.       new_modtime = new_statbuf.st_mtime;
  2534.       if (new_modtime != objfile->mtime)
  2535.         {
  2536.           struct cleanup *old_cleanups;
  2537.           struct section_offsets *offsets;
  2538.           int num_offsets;
  2539.           char *original_name;

  2541.           printf_unfiltered (_("`%s' has changed; re-reading symbols.\n"),
  2542.                              objfile_name (objfile));

  2544.           /* There are various functions like symbol_file_add,
  2545.              symfile_bfd_open, syms_from_objfile, etc., which might
  2546.              appear to do what we want.  But they have various other
  2547.              effects which we *don't* want.  So we just do stuff
  2548.              ourselves.  We don't worry about mapped files (for one thing,
  2549.              any mapped file will be out of date).  */

  2551.           /* If we get an error, blow away this objfile (not sure if
  2552.              that is the correct response for things like shared
  2553.              libraries).  */
  2554.           old_cleanups = make_cleanup_free_objfile (objfile);
  2555.           /* We need to do this whenever any symbols go away.  */
  2556.           make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/);

  2558.           if (exec_bfd != NULL
  2559.               && filename_cmp (bfd_get_filename (objfile->obfd),
  2560.                                bfd_get_filename (exec_bfd)) == 0)
  2561.             {
  2562.               /* Reload EXEC_BFD without asking anything.  */

  2564.               exec_file_attach (bfd_get_filename (objfile->obfd), 0);
  2565.             }

  2567.           /* Keep the calls order approx. the same as in free_objfile.  */

  2569.           /* Free the separate debug objfiles.  It will be
  2570.              automatically recreated by sym_read.  */
  2571.           free_objfile_separate_debug (objfile);

  2573.           /* Remove any references to this objfile in the global
  2574.              value lists.  */
  2575.           preserve_values (objfile);

  2577.           /* Nuke all the state that we will re-read.  Much of the following
  2578.              code which sets things to NULL really is necessary to tell
  2579.              other parts of GDB that there is nothing currently there.

  2581.              Try to keep the freeing order compatible with free_objfile.  */

  2583.           if (objfile->sf != NULL)
  2584.             {
  2585.               (*objfile->sf->sym_finish) (objfile);
  2586.             }

  2588.           clear_objfile_data (objfile);

  2590.           /* Clean up any state BFD has sitting around.  */
  2591.           {
  2592.             struct bfd *obfd = objfile->obfd;
  2593.             char *obfd_filename;

  2595.             obfd_filename = bfd_get_filename (objfile->obfd);
  2596.             /* Open the new BFD before freeing the old one, so that
  2597.                the filename remains live.  */
  2598.             objfile->obfd = gdb_bfd_open_maybe_remote (obfd_filename);
  2599.             if (objfile->obfd == NULL)
  2600.               {
  2601.                 /* We have to make a cleanup and error here, rather
  2602.                    than erroring later, because once we unref OBFD,
  2603.                    OBFD_FILENAME will be freed.  */
  2604.                 make_cleanup_bfd_unref (obfd);
  2605.                 error (_("Can't open %s to read symbols."), obfd_filename);
  2606.               }
  2607.             gdb_bfd_unref (obfd);
  2608.           }

  2610.           original_name = xstrdup (objfile->original_name);
  2611.           make_cleanup (xfree, original_name);

  2613.           /* bfd_openr sets cacheable to true, which is what we want.  */
  2614.           if (!bfd_check_format (objfile->obfd, bfd_object))
  2615.             error (_("Can't read symbols from %s: %s."), objfile_name (objfile),
  2616.                    bfd_errmsg (bfd_get_error ()));

  2618.           /* Save the offsets, we will nuke them with the rest of the
  2619.              objfile_obstack.  */
  2620.           num_offsets = objfile->num_sections;
  2621.           offsets = ((struct section_offsets *)
  2622.                      alloca (SIZEOF_N_SECTION_OFFSETS (num_offsets)));
  2623.           memcpy (offsets, objfile->section_offsets,
  2624.                   SIZEOF_N_SECTION_OFFSETS (num_offsets));

  2626.           /* FIXME: Do we have to free a whole linked list, or is this
  2627.              enough?  */
  2628.           if (objfile->global_psymbols.list)
  2629.             xfree (objfile->global_psymbols.list);
  2630.           memset (&objfile->global_psymbols, 0,
  2631.                   sizeof (objfile->global_psymbols));
  2632.           if (objfile->static_psymbols.list)
  2633.             xfree (objfile->static_psymbols.list);
  2634.           memset (&objfile->static_psymbols, 0,
  2635.                   sizeof (objfile->static_psymbols));

  2637.           /* Free the obstacks for non-reusable objfiles.  */
  2638.           psymbol_bcache_free (objfile->psymbol_cache);
  2639.           objfile->psymbol_cache = psymbol_bcache_init ();
  2640.           obstack_free (&objfile->objfile_obstack, 0);
  2641.           objfile->sections = NULL;
  2642.           objfile->compunit_symtabs = NULL;
  2643.           objfile->psymtabs = NULL;
  2644.           objfile->psymtabs_addrmap = NULL;
  2645.           objfile->free_psymtabs = NULL;
  2646.           objfile->template_symbols = NULL;

  2648.           /* obstack_init also initializes the obstack so it is
  2649.              empty.  We could use obstack_specify_allocation but
  2650.              gdb_obstack.h specifies the alloc/dealloc functions.  */
  2651.           obstack_init (&objfile->objfile_obstack);

  2653.           /* set_objfile_per_bfd potentially allocates the per-bfd
  2654.              data on the objfile's obstack (if sharing data across
  2655.              multiple users is not possible), so it's important to
  2656.              do it *after* the obstack has been initialized.  */
  2657.           set_objfile_per_bfd (objfile);

  2659.           objfile->original_name = obstack_copy0 (&objfile->objfile_obstack,
  2660.                                                   original_name,
  2661.                                                   strlen (original_name));

  2663.           /* Reset the sym_fns pointer.  The ELF reader can change it
  2664.              based on whether .gdb_index is present, and we need it to
  2665.              start over.  PR symtab/15885  */
  2666.           objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd));

  2668.           build_objfile_section_table (objfile);
  2669.           terminate_minimal_symbol_table (objfile);

  2671.           /* We use the same section offsets as from last time.  I'm not
  2672.              sure whether that is always correct for shared libraries.  */
  2673.           objfile->section_offsets = (struct section_offsets *)
  2674.             obstack_alloc (&objfile->objfile_obstack,
  2675.                            SIZEOF_N_SECTION_OFFSETS (num_offsets));
  2676.           memcpy (objfile->section_offsets, offsets,
  2677.                   SIZEOF_N_SECTION_OFFSETS (num_offsets));
  2678.           objfile->num_sections = num_offsets;

  2680.           /* What the hell is sym_new_init for, anyway?  The concept of
  2681.              distinguishing between the main file and additional files
  2682.              in this way seems rather dubious.  */
  2683.           if (objfile == symfile_objfile)
  2684.             {
  2685.               (*objfile->sf->sym_new_init) (objfile);
  2686.             }

  2688.           (*objfile->sf->sym_init) (objfile);
  2689.           clear_complaints (&symfile_complaints, 1, 1);

  2691.           objfile->flags &= ~OBJF_PSYMTABS_READ;
  2692.           read_symbols (objfile, 0);

  2694.           if (!objfile_has_symbols (objfile))
  2695.             {
  2696.               wrap_here ("");
  2697.               printf_unfiltered (_("(no debugging symbols found)\n"));
  2698.               wrap_here ("");
  2699.             }

  2701.           /* We're done reading the symbol file; finish off complaints.  */
  2702.           clear_complaints (&symfile_complaints, 0, 1);

  2704.           /* Getting new symbols may change our opinion about what is
  2705.              frameless.  */

  2707.           reinit_frame_cache ();

  2709.           /* Discard cleanups as symbol reading was successful.  */
  2710.           discard_cleanups (old_cleanups);

  2712.           /* If the mtime has changed between the time we set new_modtime
  2713.              and now, we *want* this to be out of date, so don't call stat
  2714.              again now.  */
  2715.           objfile->mtime = new_modtime;
  2716.           init_entry_point_info (objfile);

  2718.           VEC_safe_push (objfilep, new_objfiles, objfile);
  2719.         }
  2720.     }

  2722.   if (new_objfiles)
  2723.     {
  2724.       int ix;

  2726.       /* Notify objfiles that we've modified objfile sections.  */
  2727.       objfiles_changed ();

  2729.       clear_symtab_users (0);

  2731.       /* clear_objfile_data for each objfile was called before freeing it and
  2732.          observer_notify_new_objfile (NULL) has been called by
  2733.          clear_symtab_users above.  Notify the new files now.  */
  2734.       for (ix = 0; VEC_iterate (objfilep, new_objfiles, ix, objfile); ix++)
  2735.         observer_notify_new_objfile (objfile);

  2737.       /* At least one objfile has changed, so we can consider that
  2738.          the executable we're debugging has changed too.  */
  2739.       observer_notify_executable_changed ();
  2740.     }

  2742.   do_cleanups (all_cleanups);
  2743. }


  2746. typedef struct
  2747. {
  2748.   char *ext;
  2749.   enum language lang;
  2750. }
  2751. ‌filename_language;

  2753. ‌static filename_language *filename_language_table;
  2754. ‌‌static int fl_table_size, fl_table_next;

  2756. static void
  2757. ‌add_filename_language (char *ext, enum language lang)
  2758. {
  2759.   if (fl_table_next >= fl_table_size)
  2760.     {
  2761.       fl_table_size += 10;
  2762.       filename_language_table =
  2763.         xrealloc (filename_language_table,
  2764.                   fl_table_size * sizeof (*filename_language_table));
  2765.     }

  2767.   filename_language_table[fl_table_next].ext = xstrdup (ext);
  2768.   filename_language_table[fl_table_next].lang = lang;
  2769.   fl_table_next++;
  2770. }

  2772. ‌static char *ext_args;
  2773. static void
  2774. ‌show_ext_args (struct ui_file *file, int from_tty,
  2775.                struct cmd_list_element *c, const char *value)
  2776. {
  2777.   fprintf_filtered (file,
  2778.                     _("Mapping between filename extension "
  2779.                       "and source language is \"%s\".\n"),
  2780.                     value);
  2781. }

  2783. static void
  2784. ‌set_ext_lang_command (char *args, int from_tty, struct cmd_list_element *e)
  2785. {
  2786.   int i;
  2787.   char *cp = ext_args;
  2788.   enum language lang;

  2790.   /* First arg is filename extension, starting with '.'  */
  2791.   if (*cp != '.')
  2792.     error (_("'%s': Filename extension must begin with '.'"), ext_args);

  2794.   /* Find end of first arg.  */
  2795.   while (*cp && !isspace (*cp))
  2796.     cp++;

  2798.   if (*cp == '\0')
  2799.     error (_("'%s': two arguments required -- "
  2800.              "filename extension and language"),
  2801.            ext_args);

  2803.   /* Null-terminate first arg.  */
  2804.   *cp++ = '\0';

  2806.   /* Find beginning of second arg, which should be a source language.  */
  2807.   cp = skip_spaces (cp);

  2809.   if (*cp == '\0')
  2810.     error (_("'%s': two arguments required -- "
  2811.              "filename extension and language"),
  2812.            ext_args);

  2814.   /* Lookup the language from among those we know.  */
  2815.   lang = language_enum (cp);

  2817.   /* Now lookup the filename extension: do we already know it?  */
  2818.   for (i = 0; i < fl_table_next; i++)
  2819.     if (0 == strcmp (ext_args, filename_language_table[i].ext))
  2820.       break;

  2822.   if (i >= fl_table_next)
  2823.     {
  2824.       /* New file extension.  */
  2825.       add_filename_language (ext_args, lang);
  2826.     }
  2827.   else
  2828.     {
  2829.       /* Redefining a previously known filename extension.  */

  2831.       /* if (from_tty) */
  2832.       /*   query ("Really make files of type %s '%s'?", */
  2833.       /*          ext_args, language_str (lang));           */

  2835.       xfree (filename_language_table[i].ext);
  2836.       filename_language_table[i].ext = xstrdup (ext_args);
  2837.       filename_language_table[i].lang = lang;
  2838.     }
  2839. }

  2841. static void
  2842. ‌info_ext_lang_command (char *args, int from_tty)
  2843. {
  2844.   int i;

  2846.   printf_filtered (_("Filename extensions and the languages they represent:"));
  2847.   printf_filtered ("\n\n");
  2848.   for (i = 0; i < fl_table_next; i++)
  2849.     printf_filtered ("\t%s\t- %s\n",
  2850.                      filename_language_table[i].ext,
  2851.                      language_str (filename_language_table[i].lang));
  2852. }

  2854. static void
  2855. ‌init_filename_language_table (void)
  2856. {
  2857.   if (fl_table_size == 0)        /* Protect against repetition.  */
  2858.     {
  2859.       fl_table_size = 20;
  2860.       fl_table_next = 0;
  2861.       filename_language_table =
  2862.         xmalloc (fl_table_size * sizeof (*filename_language_table));
  2863.       add_filename_language (".c", language_c);
  2864.       add_filename_language (".d", language_d);
  2865.       add_filename_language (".C", language_cplus);
  2866.       add_filename_language (".cc", language_cplus);
  2867.       add_filename_language (".cp", language_cplus);
  2868.       add_filename_language (".cpp", language_cplus);
  2869.       add_filename_language (".cxx", language_cplus);
  2870.       add_filename_language (".c++", language_cplus);
  2871.       add_filename_language (".java", language_java);
  2872.       add_filename_language (".class", language_java);
  2873.       add_filename_language (".m", language_objc);
  2874.       add_filename_language (".f", language_fortran);
  2875.       add_filename_language (".F", language_fortran);
  2876.       add_filename_language (".for", language_fortran);
  2877.       add_filename_language (".FOR", language_fortran);
  2878.       add_filename_language (".ftn", language_fortran);
  2879.       add_filename_language (".FTN", language_fortran);
  2880.       add_filename_language (".fpp", language_fortran);
  2881.       add_filename_language (".FPP", language_fortran);
  2882.       add_filename_language (".f90", language_fortran);
  2883.       add_filename_language (".F90", language_fortran);
  2884.       add_filename_language (".f95", language_fortran);
  2885.       add_filename_language (".F95", language_fortran);
  2886.       add_filename_language (".f03", language_fortran);
  2887.       add_filename_language (".F03", language_fortran);
  2888.       add_filename_language (".f08", language_fortran);
  2889.       add_filename_language (".F08", language_fortran);
  2890.       add_filename_language (".s", language_asm);
  2891.       add_filename_language (".sx", language_asm);
  2892.       add_filename_language (".S", language_asm);
  2893.       add_filename_language (".pas", language_pascal);
  2894.       add_filename_language (".p", language_pascal);
  2895.       add_filename_language (".pp", language_pascal);
  2896.       add_filename_language (".adb", language_ada);
  2897.       add_filename_language (".ads", language_ada);
  2898.       add_filename_language (".a", language_ada);
  2899.       add_filename_language (".ada", language_ada);
  2900.       add_filename_language (".dg", language_ada);
  2901.     }
  2902. }

  2904. enum language
  2905. ‌deduce_language_from_filename (const char *filename)
  2906. {
  2907.   int i;
  2908.   char *cp;

  2910.   if (filename != NULL)
  2911.     if ((cp = strrchr (filename, '.')) != NULL)
  2912.       for (i = 0; i < fl_table_next; i++)
  2913.         if (strcmp (cp, filename_language_table[i].ext) == 0)
  2914.           return filename_language_table[i].lang;

  2916.   return language_unknown;
  2917. }

  2919. /* Allocate and initialize a new symbol table.
  2920.    CUST is from the result of allocate_compunit_symtab.  */

  2922. struct symtab *
  2923. ‌allocate_symtab (struct compunit_symtab *cust, const char *filename)
  2924. {
  2925.   struct objfile *objfile = cust->objfile;
  2926.   struct symtab *symtab
  2927.     = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct symtab);

  2929.   symtab->filename = bcache (filename, strlen (filename) + 1,
  2930.                              objfile->per_bfd->filename_cache);
  2931.   symtab->fullname = NULL;
  2932.   symtab->language = deduce_language_from_filename (filename);

  2934.   /* This can be very verbose with lots of headers.
  2935.      Only print at higher debug levels.  */
  2936.   if (symtab_create_debug >= 2)
  2937.     {
  2938.       /* Be a bit clever with debugging messages, and don't print objfile
  2939.          every time, only when it changes.  */
  2940.       static char *last_objfile_name = NULL;

  2942.       if (last_objfile_name == NULL
  2943.           || strcmp (last_objfile_name, objfile_name (objfile)) != 0)
  2944.         {
  2945.           xfree (last_objfile_name);
  2946.           last_objfile_name = xstrdup (objfile_name (objfile));
  2947.           fprintf_unfiltered (gdb_stdlog,
  2948.                               "Creating one or more symtabs for objfile %s ...\n",
  2949.                               last_objfile_name);
  2950.         }
  2951.       fprintf_unfiltered (gdb_stdlog,
  2952.                           "Created symtab %s for module %s.\n",
  2953.                           host_address_to_string (symtab), filename);
  2954.     }

  2956.   /* Add it to CUST's list of symtabs.  */
  2957.   if (cust->filetabs == NULL)
  2958.     {
  2959.       cust->filetabs = symtab;
  2960.       cust->last_filetab = symtab;
  2961.     }
  2962.   else
  2963.     {
  2964.       cust->last_filetab->next = symtab;
  2965.       cust->last_filetab = symtab;
  2966.     }

  2968.   /* Backlink to the containing compunit symtab.  */
  2969.   symtab->compunit_symtab = cust;

  2971.   return symtab;
  2972. }

  2974. /* Allocate and initialize a new compunit.
  2975.    NAME is the name of the main source file, if there is one, or some
  2976.    descriptive text if there are no source files.  */

  2978. struct compunit_symtab *
  2979. ‌allocate_compunit_symtab (struct objfile *objfile, const char *name)
  2980. {
  2981.   struct compunit_symtab *cu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
  2982.                                                struct compunit_symtab);
  2983.   const char *saved_name;

  2985.   cu->objfile = objfile;

  2987.   /* The name we record here is only for display/debugging purposes.
  2988.      Just save the basename to avoid path issues (too long for display,
  2989.      relative vs absolute, etc.).  */
  2990.   saved_name = lbasename (name);
  2991.   cu->name = obstack_copy0 (&objfile->objfile_obstack, saved_name,
  2992.                             strlen (saved_name));

  2994.   COMPUNIT_DEBUGFORMAT (cu) = "unknown";

  2996.   if (symtab_create_debug)
  2997.     {
  2998.       fprintf_unfiltered (gdb_stdlog,
  2999.                           "Created compunit symtab %s for %s.\n",
  3000.                           host_address_to_string (cu),
  3001.                           cu->name);
  3002.     }

  3004.   return cu;
  3005. }

  3007. /* Hook CU to the objfile it comes from.  */

  3009. void
  3010. ‌add_compunit_symtab_to_objfile (struct compunit_symtab *cu)
  3011. {
  3012.   cu->next = cu->objfile->compunit_symtabs;
  3013.   cu->objfile->compunit_symtabs = cu;
  3014. }


  3017. /* Reset all data structures in gdb which may contain references to symbol
  3018.    table data.  ADD_FLAGS is a bitmask of enum symfile_add_flags.  */

  3020. void
  3021. ‌clear_symtab_users (int add_flags)
  3022. {
  3023.   /* Someday, we should do better than this, by only blowing away
  3024.      the things that really need to be blown.  */

  3026.   /* Clear the "current" symtab first, because it is no longer valid.
  3027.      breakpoint_re_set may try to access the current symtab.  */
  3028.   clear_current_source_symtab_and_line ();

  3030.   clear_displays ();
  3031.   if ((add_flags & SYMFILE_DEFER_BP_RESET) == 0)
  3032.     breakpoint_re_set ();
  3033.   clear_last_displayed_sal ();
  3034.   clear_pc_function_cache ();
  3035.   observer_notify_new_objfile (NULL);

  3037.   /* Clear globals which might have pointed into a removed objfile.
  3038.      FIXME: It's not clear which of these are supposed to persist
  3039.      between expressions and which ought to be reset each time.  */
  3040.   expression_context_block = NULL;
  3041.   innermost_block = NULL;

  3043.   /* Varobj may refer to old symbols, perform a cleanup.  */
  3044.   varobj_invalidate ();

  3046. }

  3048. static void
  3049. ‌clear_symtab_users_cleanup (void *ignore)
  3050. {
  3051.   clear_symtab_users (0);
  3052. }

  3054. /* OVERLAYS:
  3055.    The following code implements an abstraction for debugging overlay sections.

  3057.    The target model is as follows:
  3058.    1) The gnu linker will permit multiple sections to be mapped into the
  3059.    same VMA, each with its own unique LMA (or load address).
  3060.    2) It is assumed that some runtime mechanism exists for mapping the
  3061.    sections, one by one, from the load address into the VMA address.
  3062.    3) This code provides a mechanism for gdb to keep track of which
  3063.    sections should be considered to be mapped from the VMA to the LMA.
  3064.    This information is used for symbol lookup, and memory read/write.
  3065.    For instance, if a section has been mapped then its contents
  3066.    should be read from the VMA, otherwise from the LMA.

  3068.    Two levels of debugger support for overlays are available.  One is
  3069.    "manual", in which the debugger relies on the user to tell it which
  3070.    overlays are currently mapped.  This level of support is
  3071.    implemented entirely in the core debugger, and the information about
  3072.    whether a section is mapped is kept in the objfile->obj_section table.

  3074.    The second level of support is "automatic", and is only available if
  3075.    the target-specific code provides functionality to read the target's
  3076.    overlay mapping table, and translate its contents for the debugger
  3077.    (by updating the mapped state information in the obj_section tables).

  3079.    The interface is as follows:
  3080.    User commands:
  3081.    overlay map <name>   -- tell gdb to consider this section mapped
  3082.    overlay unmap <name> -- tell gdb to consider this section unmapped
  3083.    overlay list         -- list the sections that GDB thinks are mapped
  3084.    overlay read-target  -- get the target's state of what's mapped
  3085.    overlay off/manual/auto -- set overlay debugging state
  3086.    Functional interface:
  3087.    find_pc_mapped_section(pc):    if the pc is in the range of a mapped
  3088.    section, return that section.
  3089.    find_pc_overlay(pc):       find any overlay section that contains
  3090.    the pc, either in its VMA or its LMA
  3091.    section_is_mapped(sect):       true if overlay is marked as mapped
  3092.    section_is_overlay(sect):      true if section's VMA != LMA
  3093.    pc_in_mapped_range(pc,sec):    true if pc belongs to section's VMA
  3094.    pc_in_unmapped_range(...):     true if pc belongs to section's LMA
  3095.    sections_overlap(sec1, sec2):  true if mapped sec1 and sec2 ranges overlap
  3096.    overlay_mapped_address(...):   map an address from section's LMA to VMA
  3097.    overlay_unmapped_address(...): map an address from section's VMA to LMA
  3098.    symbol_overlayed_address(...): Return a "current" address for symbol:
  3099.    either in VMA or LMA depending on whether
  3100.    the symbol's section is currently mapped.  */

  3102. /* Overlay debugging state: */

  3104. ‌enum overlay_debugging_state overlay_debugging = ovly_off;
  3105. ‌int overlay_cache_invalid = 0;        /* True if need to refresh mapped state.  */

  3107. /* Function: section_is_overlay (SECTION)
  3108.    Returns true if SECTION has VMA not equal to LMA, ie.
  3109.    SECTION is loaded at an address different from where it will "run".  */

  3111. int
  3112. ‌section_is_overlay (struct obj_section *section)
  3113. {
  3114.   if (overlay_debugging && section)
  3115.     {
  3116.       bfd *abfd = section->objfile->obfd;
  3117.       asection *bfd_section = section->the_bfd_section;

  3119.       if (bfd_section_lma (abfd, bfd_section) != 0
  3120.           && bfd_section_lma (abfd, bfd_section)
  3121.              != bfd_section_vma (abfd, bfd_section))
  3122.         return 1;
  3123.     }

  3125.   return 0;
  3126. }

  3128. /* Function: overlay_invalidate_all (void)
  3129.    Invalidate the mapped state of all overlay sections (mark it as stale).  */

  3131. static void
  3132. ‌overlay_invalidate_all (void)
  3133. {
  3134.   struct objfile *objfile;
  3135.   struct obj_section *sect;

  3137.   ALL_OBJSECTIONS (objfile, sect)
  3138.     if (section_is_overlay (sect))
  3139.       sect->ovly_mapped = -1;
  3140. }

  3142. /* Function: section_is_mapped (SECTION)
  3143.    Returns true if section is an overlay, and is currently mapped.

  3145.    Access to the ovly_mapped flag is restricted to this function, so
  3146.    that we can do automatic update.  If the global flag
  3147.    OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
  3148.    overlay_invalidate_all.  If the mapped state of the particular
  3149.    section is stale, then call TARGET_OVERLAY_UPDATE to refresh it.  */

  3151. int
  3152. ‌section_is_mapped (struct obj_section *osect)
  3153. {
  3154.   struct gdbarch *gdbarch;

  3156.   if (osect == 0 || !section_is_overlay (osect))
  3157.     return 0;

  3159.   switch (overlay_debugging)
  3160.     {
  3161.     default:
  3162.     case ovly_off:
  3163.       return 0;                        /* overlay debugging off */
  3164.     case ovly_auto:                /* overlay debugging automatic */
  3165.       /* Unles there is a gdbarch_overlay_update function,
  3166.          there's really nothing useful to do here (can't really go auto).  */
  3167.       gdbarch = get_objfile_arch (osect->objfile);
  3168.       if (gdbarch_overlay_update_p (gdbarch))
  3169.         {
  3170.           if (overlay_cache_invalid)
  3171.             {
  3172.               overlay_invalidate_all ();
  3173.               overlay_cache_invalid = 0;
  3174.             }
  3175.           if (osect->ovly_mapped == -1)
  3176.             gdbarch_overlay_update (gdbarch, osect);
  3177.         }
  3178.       /* fall thru to manual case */
  3179.     case ovly_on:                /* overlay debugging manual */
  3180.       return osect->ovly_mapped == 1;
  3181.     }
  3182. }

  3184. /* Function: pc_in_unmapped_range
  3185.    If PC falls into the lma range of SECTION, return true, else false.  */

  3187. CORE_ADDR
  3188. ‌pc_in_unmapped_range (CORE_ADDR pc, struct obj_section *section)
  3189. {
  3190.   if (section_is_overlay (section))
  3191.     {
  3192.       bfd *abfd = section->objfile->obfd;
  3193.       asection *bfd_section = section->the_bfd_section;

  3195.       /* We assume the LMA is relocated by the same offset as the VMA.  */
  3196.       bfd_vma size = bfd_get_section_size (bfd_section);
  3197.       CORE_ADDR offset = obj_section_offset (section);

  3199.       if (bfd_get_section_lma (abfd, bfd_section) + offset <= pc
  3200.           && pc < bfd_get_section_lma (abfd, bfd_section) + offset + size)
  3201.         return 1;
  3202.     }

  3204.   return 0;
  3205. }

  3207. /* Function: pc_in_mapped_range
  3208.    If PC falls into the vma range of SECTION, return true, else false.  */

  3210. CORE_ADDR
  3211. ‌pc_in_mapped_range (CORE_ADDR pc, struct obj_section *section)
  3212. {
  3213.   if (section_is_overlay (section))
  3214.     {
  3215.       if (obj_section_addr (section) <= pc
  3216.           && pc < obj_section_endaddr (section))
  3217.         return 1;
  3218.     }

  3220.   return 0;
  3221. }

  3223. /* Return true if the mapped ranges of sections A and B overlap, false
  3224.    otherwise.  */

  3226. static int
  3227. ‌sections_overlap (struct obj_section *a, struct obj_section *b)
  3228. {
  3229.   CORE_ADDR a_start = obj_section_addr (a);
  3230.   CORE_ADDR a_end = obj_section_endaddr (a);
  3231.   CORE_ADDR b_start = obj_section_addr (b);
  3232.   CORE_ADDR b_end = obj_section_endaddr (b);

  3234.   return (a_start < b_end && b_start < a_end);
  3235. }

  3237. /* Function: overlay_unmapped_address (PC, SECTION)
  3238.    Returns the address corresponding to PC in the unmapped (load) range.
  3239.    May be the same as PC.  */

  3241. CORE_ADDR
  3242. ‌overlay_unmapped_address (CORE_ADDR pc, struct obj_section *section)
  3243. {
  3244.   if (section_is_overlay (section) && pc_in_mapped_range (pc, section))
  3245.     {
  3246.       bfd *abfd = section->objfile->obfd;
  3247.       asection *bfd_section = section->the_bfd_section;

  3249.       return pc + bfd_section_lma (abfd, bfd_section)
  3250.                 - bfd_section_vma (abfd, bfd_section);
  3251.     }

  3253.   return pc;
  3254. }

  3256. /* Function: overlay_mapped_address (PC, SECTION)
  3257.    Returns the address corresponding to PC in the mapped (runtime) range.
  3258.    May be the same as PC.  */

  3260. CORE_ADDR
  3261. ‌overlay_mapped_address (CORE_ADDR pc, struct obj_section *section)
  3262. {
  3263.   if (section_is_overlay (section) && pc_in_unmapped_range (pc, section))
  3264.     {
  3265.       bfd *abfd = section->objfile->obfd;
  3266.       asection *bfd_section = section->the_bfd_section;

  3268.       return pc + bfd_section_vma (abfd, bfd_section)
  3269.                 - bfd_section_lma (abfd, bfd_section);
  3270.     }

  3272.   return pc;
  3273. }

  3275. /* Function: symbol_overlayed_address
  3276.    Return one of two addresses (relative to the VMA or to the LMA),
  3277.    depending on whether the section is mapped or not.  */

  3279. CORE_ADDR
  3280. ‌symbol_overlayed_address (CORE_ADDR address, struct obj_section *section)
  3281. {
  3282.   if (overlay_debugging)
  3283.     {
  3284.       /* If the symbol has no section, just return its regular address.  */
  3285.       if (section == 0)
  3286.         return address;
  3287.       /* If the symbol's section is not an overlay, just return its
  3288.          address.  */
  3289.       if (!section_is_overlay (section))
  3290.         return address;
  3291.       /* If the symbol's section is mapped, just return its address.  */
  3292.       if (section_is_mapped (section))
  3293.         return address;
  3294.       /*
  3295.        * HOWEVER: if the symbol is in an overlay section which is NOT mapped,
  3296.        * then return its LOADED address rather than its vma address!!
  3297.        */
  3298.       return overlay_unmapped_address (address, section);
  3299.     }
  3300.   return address;
  3301. }

  3303. /* Function: find_pc_overlay (PC)
  3304.    Return the best-match overlay section for PC:
  3305.    If PC matches a mapped overlay section's VMA, return that section.
  3306.    Else if PC matches an unmapped section's VMA, return that section.
  3307.    Else if PC matches an unmapped section's LMA, return that section.  */

  3309. struct obj_section *
  3310. ‌find_pc_overlay (CORE_ADDR pc)
  3311. {
  3312.   struct objfile *objfile;
  3313.   struct obj_section *osect, *best_match = NULL;

  3315.   if (overlay_debugging)
  3316.     ALL_OBJSECTIONS (objfile, osect)
  3317.       if (section_is_overlay (osect))
  3318.       {
  3319.         if (pc_in_mapped_range (pc, osect))
  3320.           {
  3321.             if (section_is_mapped (osect))
  3322.               return osect;
  3323.             else
  3324.               best_match = osect;
  3325.           }
  3326.         else if (pc_in_unmapped_range (pc, osect))
  3327.           best_match = osect;
  3328.       }
  3329.   return best_match;
  3330. }

  3332. /* Function: find_pc_mapped_section (PC)
  3333.    If PC falls into the VMA address range of an overlay section that is
  3334.    currently marked as MAPPED, return that section.  Else return NULL.  */

  3336. struct obj_section *
  3337. ‌find_pc_mapped_section (CORE_ADDR pc)
  3338. {
  3339.   struct objfile *objfile;
  3340.   struct obj_section *osect;

  3342.   if (overlay_debugging)
  3343.     ALL_OBJSECTIONS (objfile, osect)
  3344.       if (pc_in_mapped_range (pc, osect) && section_is_mapped (osect))
  3345.         return osect;

  3347.   return NULL;
  3348. }

  3350. /* Function: list_overlays_command
  3351.    Print a list of mapped sections and their PC ranges.  */

  3353. static void
  3354. ‌list_overlays_command (char *args, int from_tty)
  3355. {
  3356.   int nmapped = 0;
  3357.   struct objfile *objfile;
  3358.   struct obj_section *osect;

  3360.   if (overlay_debugging)
  3361.     ALL_OBJSECTIONS (objfile, osect)
  3362.       if (section_is_mapped (osect))
  3363.       {
  3364.         struct gdbarch *gdbarch = get_objfile_arch (objfile);
  3365.         const char *name;
  3366.         bfd_vma lma, vma;
  3367.         int size;

  3369.         vma = bfd_section_vma (objfile->obfd, osect->the_bfd_section);
  3370.         lma = bfd_section_lma (objfile->obfd, osect->the_bfd_section);
  3371.         size = bfd_get_section_size (osect->the_bfd_section);
  3372.         name = bfd_section_name (objfile->obfd, osect->the_bfd_section);

  3374.         printf_filtered ("Section %s, loaded at ", name);
  3375.         fputs_filtered (paddress (gdbarch, lma), gdb_stdout);
  3376.         puts_filtered (" - ");
  3377.         fputs_filtered (paddress (gdbarch, lma + size), gdb_stdout);
  3378.         printf_filtered (", mapped at ");
  3379.         fputs_filtered (paddress (gdbarch, vma), gdb_stdout);
  3380.         puts_filtered (" - ");
  3381.         fputs_filtered (paddress (gdbarch, vma + size), gdb_stdout);
  3382.         puts_filtered ("\n");

  3384.         nmapped++;
  3385.       }
  3386.   if (nmapped == 0)
  3387.     printf_filtered (_("No sections are mapped.\n"));
  3388. }

  3390. /* Function: map_overlay_command
  3391.    Mark the named section as mapped (ie. residing at its VMA address).  */

  3393. static void
  3394. ‌map_overlay_command (char *args, int from_tty)
  3395. {
  3396.   struct objfile *objfile, *objfile2;
  3397.   struct obj_section *sec, *sec2;

  3399.   if (!overlay_debugging)
  3400.     error (_("Overlay debugging not enabled.  Use "
  3401.              "either the 'overlay auto' or\n"
  3402.              "the 'overlay manual' command."));

  3404.   if (args == 0 || *args == 0)
  3405.     error (_("Argument required: name of an overlay section"));

  3407.   /* First, find a section matching the user supplied argument.  */
  3408.   ALL_OBJSECTIONS (objfile, sec)
  3409.     if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
  3410.     {
  3411.       /* Now, check to see if the section is an overlay.  */
  3412.       if (!section_is_overlay (sec))
  3413.         continue;                /* not an overlay section */

  3415.       /* Mark the overlay as "mapped".  */
  3416.       sec->ovly_mapped = 1;

  3418.       /* Next, make a pass and unmap any sections that are
  3419.          overlapped by this new section: */
  3420.       ALL_OBJSECTIONS (objfile2, sec2)
  3421.         if (sec2->ovly_mapped && sec != sec2 && sections_overlap (sec, sec2))
  3422.         {
  3423.           if (info_verbose)
  3424.             printf_unfiltered (_("Note: section %s unmapped by overlap\n"),
  3425.                              bfd_section_name (objfile->obfd,
  3426.                                                sec2->the_bfd_section));
  3427.           sec2->ovly_mapped = 0;        /* sec2 overlaps sec: unmap sec2.  */
  3428.         }
  3429.       return;
  3430.     }
  3431.   error (_("No overlay section called %s"), args);
  3432. }

  3434. /* Function: unmap_overlay_command
  3435.    Mark the overlay section as unmapped
  3436.    (ie. resident in its LMA address range, rather than the VMA range).  */

  3438. static void
  3439. ‌unmap_overlay_command (char *args, int from_tty)
  3440. {
  3441.   struct objfile *objfile;
  3442.   struct obj_section *sec;

  3444.   if (!overlay_debugging)
  3445.     error (_("Overlay debugging not enabled.  "
  3446.              "Use either the 'overlay auto' or\n"
  3447.              "the 'overlay manual' command."));

  3449.   if (args == 0 || *args == 0)
  3450.     error (_("Argument required: name of an overlay section"));

  3452.   /* First, find a section matching the user supplied argument.  */
  3453.   ALL_OBJSECTIONS (objfile, sec)
  3454.     if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
  3455.     {
  3456.       if (!sec->ovly_mapped)
  3457.         error (_("Section %s is not mapped"), args);
  3458.       sec->ovly_mapped = 0;
  3459.       return;
  3460.     }
  3461.   error (_("No overlay section called %s"), args);
  3462. }

  3464. /* Function: overlay_auto_command
  3465.    A utility command to turn on overlay debugging.
  3466.    Possibly this should be done via a set/show command.  */

  3468. static void
  3469. ‌overlay_auto_command (char *args, int from_tty)
  3470. {
  3471.   overlay_debugging = ovly_auto;
  3472.   enable_overlay_breakpoints ();
  3473.   if (info_verbose)
  3474.     printf_unfiltered (_("Automatic overlay debugging enabled."));
  3475. }

  3477. /* Function: overlay_manual_command
  3478.    A utility command to turn on overlay debugging.
  3479.    Possibly this should be done via a set/show command.  */

  3481. static void
  3482. ‌overlay_manual_command (char *args, int from_tty)
  3483. {
  3484.   overlay_debugging = ovly_on;
  3485.   disable_overlay_breakpoints ();
  3486.   if (info_verbose)
  3487.     printf_unfiltered (_("Overlay debugging enabled."));
  3488. }

  3490. /* Function: overlay_off_command
  3491.    A utility command to turn on overlay debugging.
  3492.    Possibly this should be done via a set/show command.  */

  3494. static void
  3495. ‌overlay_off_command (char *args, int from_tty)
  3496. {
  3497.   overlay_debugging = ovly_off;
  3498.   disable_overlay_breakpoints ();
  3499.   if (info_verbose)
  3500.     printf_unfiltered (_("Overlay debugging disabled."));
  3501. }

  3503. static void
  3504. ‌overlay_load_command (char *args, int from_tty)
  3505. {
  3506.   struct gdbarch *gdbarch = get_current_arch ();

  3508.   if (gdbarch_overlay_update_p (gdbarch))
  3509.     gdbarch_overlay_update (gdbarch, NULL);
  3510.   else
  3511.     error (_("This target does not know how to read its overlay state."));
  3512. }

  3514. /* Function: overlay_command
  3515.    A place-holder for a mis-typed command.  */

  3517. /* Command list chain containing all defined "overlay" subcommands.  */
  3518. ‌static struct cmd_list_element *overlaylist;

  3520. static void
  3521. ‌overlay_command (char *args, int from_tty)
  3522. {
  3523.   printf_unfiltered
  3524.     ("\"overlay\" must be followed by the name of an overlay command.\n");
  3525.   help_list (overlaylist, "overlay ", all_commands, gdb_stdout);
  3526. }

  3528. /* Target Overlays for the "Simplest" overlay manager:

  3530.    This is GDB's default target overlay layer.  It works with the
  3531.    minimal overlay manager supplied as an example by Cygnus.  The
  3532.    entry point is via a function pointer "gdbarch_overlay_update",
  3533.    so targets that use a different runtime overlay manager can
  3534.    substitute their own overlay_update function and take over the
  3535.    function pointer.

  3537.    The overlay_update function pokes around in the target's data structures
  3538.    to see what overlays are mapped, and updates GDB's overlay mapping with
  3539.    this information.

  3541.    In this simple implementation, the target data structures are as follows:
  3542.    unsigned _novlys;            /# number of overlay sections #/
  3543.    unsigned _ovly_table[_novlys][4] = {
  3544.    {VMA, SIZE, LMA, MAPPED},    /# one entry per overlay section #/
  3545.    {..., ...,  ..., ...},
  3546.    }
  3547.    unsigned _novly_regions;     /# number of overlay regions #/
  3548.    unsigned _ovly_region_table[_novly_regions][3] = {
  3549.    {VMA, SIZE, MAPPED_TO_LMA},  /# one entry per overlay region #/
  3550.    {..., ...,  ...},
  3551.    }
  3552.    These functions will attempt to update GDB's mappedness state in the
  3553.    symbol section table, based on the target's mappedness state.

  3555.    To do this, we keep a cached copy of the target's _ovly_table, and
  3556.    attempt to detect when the cached copy is invalidated.  The main
  3557.    entry point is "simple_overlay_update(SECT), which looks up SECT in
  3558.    the cached table and re-reads only the entry for that section from
  3559.    the target (whenever possible).  */

  3561. /* Cached, dynamically allocated copies of the target data structures: */
  3562. ‌static unsigned (*cache_ovly_table)[4] = 0;
  3563. ‌static unsigned cache_novlys = 0;
  3564. ‌static CORE_ADDR cache_ovly_table_base = 0;
  3565. ‌enum ovly_index
  3566.   {
  3567.     VMA, SIZE, LMA, MAPPED
  3568.   };

  3570. /* Throw away the cached copy of _ovly_table.  */

  3572. static void
  3573. ‌simple_free_overlay_table (void)
  3574. {
  3575.   if (cache_ovly_table)
  3576.     xfree (cache_ovly_table);
  3577.   cache_novlys = 0;
  3578.   cache_ovly_table = NULL;
  3579.   cache_ovly_table_base = 0;
  3580. }

  3582. /* Read an array of ints of size SIZE from the target into a local buffer.
  3583.    Convert to host order.  int LEN is number of ints.  */

  3585. static void
  3586. ‌read_target_long_array (CORE_ADDR memaddr, unsigned int *myaddr,
  3587.                         int len, int size, enum bfd_endian byte_order)
  3588. {
  3589.   /* FIXME (alloca): Not safe if array is very large.  */
  3590.   gdb_byte *buf = alloca (len * size);
  3591.   int i;

  3593.   read_memory (memaddr, buf, len * size);
  3594.   for (i = 0; i < len; i++)
  3595.     myaddr[i] = extract_unsigned_integer (size * i + buf, size, byte_order);
  3596. }

  3598. /* Find and grab a copy of the target _ovly_table
  3599.    (and _novlys, which is needed for the table's size).  */

  3601. static int
  3602. ‌simple_read_overlay_table (void)
  3603. {
  3604.   struct bound_minimal_symbol novlys_msym;
  3605.   struct bound_minimal_symbol ovly_table_msym;
  3606.   struct gdbarch *gdbarch;
  3607.   int word_size;
  3608.   enum bfd_endian byte_order;

  3610.   simple_free_overlay_table ();
  3611.   novlys_msym = lookup_minimal_symbol ("_novlys", NULL, NULL);
  3612.   if (! novlys_msym.minsym)
  3613.     {
  3614.       error (_("Error reading inferior's overlay table: "
  3615.              "couldn't find `_novlys' variable\n"
  3616.              "in inferior.  Use `overlay manual' mode."));
  3617.       return 0;
  3618.     }

  3620.   ovly_table_msym = lookup_bound_minimal_symbol ("_ovly_table");
  3621.   if (! ovly_table_msym.minsym)
  3622.     {
  3623.       error (_("Error reading inferior's overlay table: couldn't find "
  3624.              "`_ovly_table' array\n"
  3625.              "in inferior.  Use `overlay manual' mode."));
  3626.       return 0;
  3627.     }

  3629.   gdbarch = get_objfile_arch (ovly_table_msym.objfile);
  3630.   word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
  3631.   byte_order = gdbarch_byte_order (gdbarch);

  3633.   cache_novlys = read_memory_integer (BMSYMBOL_VALUE_ADDRESS (novlys_msym),
  3634.                                       4, byte_order);
  3635.   cache_ovly_table
  3636.     = (void *) xmalloc (cache_novlys * sizeof (*cache_ovly_table));
  3637.   cache_ovly_table_base = BMSYMBOL_VALUE_ADDRESS (ovly_table_msym);
  3638.   read_target_long_array (cache_ovly_table_base,
  3639.                           (unsigned int *) cache_ovly_table,
  3640.                           cache_novlys * 4, word_size, byte_order);

  3642.   return 1;                        /* SUCCESS */
  3643. }

  3645. /* Function: simple_overlay_update_1
  3646.    A helper function for simple_overlay_update.  Assuming a cached copy
  3647.    of _ovly_table exists, look through it to find an entry whose vma,
  3648.    lma and size match those of OSECT.  Re-read the entry and make sure
  3649.    it still matches OSECT (else the table may no longer be valid).
  3650.    Set OSECT's mapped state to match the entry.  Return: 1 for
  3651.    success, 0 for failure.  */

  3653. static int
  3654. ‌simple_overlay_update_1 (struct obj_section *osect)
  3655. {
  3656.   int i, size;
  3657.   bfd *obfd = osect->objfile->obfd;
  3658.   asection *bsect = osect->the_bfd_section;
  3659.   struct gdbarch *gdbarch = get_objfile_arch (osect->objfile);
  3660.   int word_size = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
  3661.   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

  3663.   size = bfd_get_section_size (osect->the_bfd_section);
  3664.   for (i = 0; i < cache_novlys; i++)
  3665.     if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
  3666.         && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
  3667.         /* && cache_ovly_table[i][SIZE] == size */ )
  3668.       {
  3669.         read_target_long_array (cache_ovly_table_base + i * word_size,
  3670.                                 (unsigned int *) cache_ovly_table[i],
  3671.                                 4, word_size, byte_order);
  3672.         if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
  3673.             && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
  3674.             /* && cache_ovly_table[i][SIZE] == size */ )
  3675.           {
  3676.             osect->ovly_mapped = cache_ovly_table[i][MAPPED];
  3677.             return 1;
  3678.           }
  3679.         else        /* Warning!  Warning!  Target's ovly table has changed!  */
  3680.           return 0;
  3681.       }
  3682.   return 0;
  3683. }

  3685. /* Function: simple_overlay_update
  3686.    If OSECT is NULL, then update all sections' mapped state
  3687.    (after re-reading the entire target _ovly_table).
  3688.    If OSECT is non-NULL, then try to find a matching entry in the
  3689.    cached ovly_table and update only OSECT's mapped state.
  3690.    If a cached entry can't be found or the cache isn't valid, then
  3691.    re-read the entire cache, and go ahead and update all sections.  */

  3693. void
  3694. ‌simple_overlay_update (struct obj_section *osect)
  3695. {
  3696.   struct objfile *objfile;

  3698.   /* Were we given an osect to look up?  NULL means do all of them.  */
  3699.   if (osect)
  3700.     /* Have we got a cached copy of the target's overlay table?  */
  3701.     if (cache_ovly_table != NULL)
  3702.       {
  3703.         /* Does its cached location match what's currently in the
  3704.            symtab?  */
  3705.         struct bound_minimal_symbol minsym
  3706.           = lookup_minimal_symbol ("_ovly_table", NULL, NULL);

  3708.         if (minsym.minsym == NULL)
  3709.           error (_("Error reading inferior's overlay table: couldn't "
  3710.                    "find `_ovly_table' array\n"
  3711.                    "in inferior.  Use `overlay manual' mode."));

  3713.         if (cache_ovly_table_base == BMSYMBOL_VALUE_ADDRESS (minsym))
  3714.           /* Then go ahead and try to look up this single section in
  3715.              the cache.  */
  3716.           if (simple_overlay_update_1 (osect))
  3717.             /* Found it!  We're done.  */
  3718.             return;
  3719.       }

  3721.   /* Cached table no good: need to read the entire table anew.
  3722.      Or else we want all the sections, in which case it's actually
  3723.      more efficient to read the whole table in one block anyway.  */

  3725.   if (! simple_read_overlay_table ())
  3726.     return;

  3728.   /* Now may as well update all sections, even if only one was requested.  */
  3729.   ALL_OBJSECTIONS (objfile, osect)
  3730.     if (section_is_overlay (osect))
  3731.     {
  3732.       int i, size;
  3733.       bfd *obfd = osect->objfile->obfd;
  3734.       asection *bsect = osect->the_bfd_section;

  3736.       size = bfd_get_section_size (bsect);
  3737.       for (i = 0; i < cache_novlys; i++)
  3738.         if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
  3739.             && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
  3740.             /* && cache_ovly_table[i][SIZE] == size */ )
  3741.           { /* obj_section matches i'th entry in ovly_table.  */
  3742.             osect->ovly_mapped = cache_ovly_table[i][MAPPED];
  3743.             break;                /* finished with inner for loop: break out.  */
  3744.           }
  3745.     }
  3746. }

  3748. /* Set the output sections and output offsets for section SECTP in
  3749.    ABFD.  The relocation code in BFD will read these offsets, so we
  3750.    need to be sure they're initialized.  We map each section to itself,
  3751.    with no offset; this means that SECTP->vma will be honored.  */

  3753. static void
  3754. ‌symfile_dummy_outputs (bfd *abfd, asection *sectp, void *dummy)
  3755. {
  3756.   sectp->output_section = sectp;
  3757.   sectp->output_offset = 0;
  3758. }

  3760. /* Default implementation for sym_relocate.  */

  3762. bfd_byte *
  3763. ‌default_symfile_relocate (struct objfile *objfile, asection *sectp,
  3764.                           bfd_byte *buf)
  3765. {
  3766.   /* Use sectp->owner instead of objfile->obfd.  sectp may point to a
  3767.      DWO file.  */
  3768.   bfd *abfd = sectp->owner;

  3770.   /* We're only interested in sections with relocation
  3771.      information.  */
  3772.   if ((sectp->flags & SEC_RELOC) == 0)
  3773.     return NULL;

  3775.   /* We will handle section offsets properly elsewhere, so relocate as if
  3776.      all sections begin at 0.  */
  3777.   bfd_map_over_sections (abfd, symfile_dummy_outputs, NULL);

  3779.   return bfd_simple_get_relocated_section_contents (abfd, sectp, buf, NULL);
  3780. }

  3782. /* Relocate the contents of a debug section SECTP in ABFD.  The
  3783.    contents are stored in BUF if it is non-NULL, or returned in a
  3784.    malloc'd buffer otherwise.

  3786.    For some platforms and debug info formats, shared libraries contain
  3787.    relocations against the debug sections (particularly for DWARF-2;
  3788.    one affected platform is PowerPC GNU/Linux, although it depends on
  3789.    the version of the linker in use).  Also, ELF object files naturally
  3790.    have unresolved relocations for their debug sections.  We need to apply
  3791.    the relocations in order to get the locations of symbols correct.
  3792.    Another example that may require relocation processing, is the
  3793.    DWARF-2 .eh_frame section in .o files, although it isn't strictly a
  3794.    debug section.  */

  3796. bfd_byte *
  3797. ‌symfile_relocate_debug_section (struct objfile *objfile,
  3798.                                 asection *sectp, bfd_byte *buf)
  3799. {
  3800.   gdb_assert (objfile->sf->sym_relocate);

  3802.   return (*objfile->sf->sym_relocate) (objfile, sectp, buf);
  3803. }

  3805. struct symfile_segment_data *
  3806. ‌get_symfile_segment_data (bfd *abfd)
  3807. {
  3808.   const struct sym_fns *sf = find_sym_fns (abfd);

  3810.   if (sf == NULL)
  3811.     return NULL;

  3813.   return sf->sym_segments (abfd);
  3814. }

  3816. void
  3817. ‌free_symfile_segment_data (struct symfile_segment_data *data)
  3818. {
  3819.   xfree (data->segment_bases);
  3820.   xfree (data->segment_sizes);
  3821.   xfree (data->segment_info);
  3822.   xfree (data);
  3823. }

  3825. /* Given:
  3826.    - DATA, containing segment addresses from the object file ABFD, and
  3827.      the mapping from ABFD's sections onto the segments that own them,
  3828.      and
  3829.    - SEGMENT_BASES[0 .. NUM_SEGMENT_BASES - 1], holding the actual
  3830.      segment addresses reported by the target,
  3831.    store the appropriate offsets for each section in OFFSETS.

  3833.    If there are fewer entries in SEGMENT_BASES than there are segments
  3834.    in DATA, then apply SEGMENT_BASES' last entry to all the segments.

  3836.    If there are more entries, then ignore the extra.  The target may
  3837.    not be able to distinguish between an empty data segment and a
  3838.    missing data segment; a missing text segment is less plausible.  */

  3840. int
  3841. ‌symfile_map_offsets_to_segments (bfd *abfd,
  3842.                                  const struct symfile_segment_data *data,
  3843.                                  struct section_offsets *offsets,
  3844.                                  int num_segment_bases,
  3845.                                  const CORE_ADDR *segment_bases)
  3846. {
  3847.   int i;
  3848.   asection *sect;

  3850.   /* It doesn't make sense to call this function unless you have some
  3851.      segment base addresses.  */
  3852.   gdb_assert (num_segment_bases > 0);

  3854.   /* If we do not have segment mappings for the object file, we
  3855.      can not relocate it by segments.  */
  3856.   gdb_assert (data != NULL);
  3857.   gdb_assert (data->num_segments > 0);

  3859.   for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
  3860.     {
  3861.       int which = data->segment_info[i];

  3863.       gdb_assert (0 <= which && which <= data->num_segments);

  3865.       /* Don't bother computing offsets for sections that aren't
  3866.          loaded as part of any segment.  */
  3867.       if (! which)
  3868.         continue;

  3870.       /* Use the last SEGMENT_BASES entry as the address of any extra
  3871.          segments mentioned in DATA->segment_info.  */
  3872.       if (which > num_segment_bases)
  3873.         which = num_segment_bases;

  3875.       offsets->offsets[i] = (segment_bases[which - 1]
  3876.                              - data->segment_bases[which - 1]);
  3877.     }

  3879.   return 1;
  3880. }

  3882. static void
  3883. ‌symfile_find_segment_sections (struct objfile *objfile)
  3884. {
  3885.   bfd *abfd = objfile->obfd;
  3886.   int i;
  3887.   asection *sect;
  3888.   struct symfile_segment_data *data;

  3890.   data = get_symfile_segment_data (objfile->obfd);
  3891.   if (data == NULL)
  3892.     return;

  3894.   if (data->num_segments != 1 && data->num_segments != 2)
  3895.     {
  3896.       free_symfile_segment_data (data);
  3897.       return;
  3898.     }

  3900.   for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
  3901.     {
  3902.       int which = data->segment_info[i];

  3904.       if (which == 1)
  3905.         {
  3906.           if (objfile->sect_index_text == -1)
  3907.             objfile->sect_index_text = sect->index;

  3909.           if (objfile->sect_index_rodata == -1)
  3910.             objfile->sect_index_rodata = sect->index;
  3911.         }
  3912.       else if (which == 2)
  3913.         {
  3914.           if (objfile->sect_index_data == -1)
  3915.             objfile->sect_index_data = sect->index;

  3917.           if (objfile->sect_index_bss == -1)
  3918.             objfile->sect_index_bss = sect->index;
  3919.         }
  3920.     }

  3922.   free_symfile_segment_data (data);
  3923. }

  3925. /* Listen for free_objfile events.  */

  3927. static void
  3928. ‌symfile_free_objfile (struct objfile *objfile)
  3929. {
  3930.   /* Remove the target sections owned by this objfile.  */
  3931.   if (objfile != NULL)
  3932.     remove_target_sections ((void *) objfile);
  3933. }

  3935. /* Wrapper around the quick_symbol_functions expand_symtabs_matching "method".
  3936.    Expand all symtabs that match the specified criteria.
  3937.    See quick_symbol_functions.expand_symtabs_matching for details.  */

  3939. void
  3940. ‌expand_symtabs_matching (expand_symtabs_file_matcher_ftype *file_matcher,
  3941.                          expand_symtabs_symbol_matcher_ftype *symbol_matcher,
  3942.                          enum search_domain kind,
  3943.                          void *data)
  3944. {
  3945.   struct objfile *objfile;

  3947.   ALL_OBJFILES (objfile)
  3948.   {
  3949.     if (objfile->sf)
  3950.       objfile->sf->qf->expand_symtabs_matching (objfile, file_matcher,
  3951.                                                 symbol_matcher, kind,
  3952.                                                 data);
  3953.   }
  3954. }

  3956. /* Wrapper around the quick_symbol_functions map_symbol_filenames "method".
  3957.    Map function FUN over every file.
  3958.    See quick_symbol_functions.map_symbol_filenames for details.  */

  3960. void
  3961. ‌map_symbol_filenames (symbol_filename_ftype *fun, void *data,
  3962.                       int need_fullname)
  3963. {
  3964.   struct objfile *objfile;

  3966.   ALL_OBJFILES (objfile)
  3967.   {
  3968.     if (objfile->sf)
  3969.       objfile->sf->qf->map_symbol_filenames (objfile, fun, data,
  3970.                                              need_fullname);
  3971.   }
  3972. }

  3974. void
  3975. ‌_initialize_symfile (void)
  3976. {
  3977.   struct cmd_list_element *c;

  3979.   observer_attach_free_objfile (symfile_free_objfile);

  3981.   c = add_cmd ("symbol-file", class_files, symbol_file_command, _("\
  3982. Load symbol table from executable file FILE.\n\
  3983. The `file' command can also load symbol tables, as well as setting the file\n\
  3984. to execute."), &cmdlist);
  3985.   set_cmd_completer (c, filename_completer);

  3987.   c = add_cmd ("add-symbol-file", class_files, add_symbol_file_command, _("\
  3988. Load symbols from FILE, assuming FILE has been dynamically loaded.\n\
  3989. Usage: add-symbol-file FILE ADDR [-s <SECT> <SECT_ADDR> -s <SECT> <SECT_ADDR>\
  3990. ...]\nADDR is the starting address of the file's text.\n\
  3991. The optional arguments are section-name section-address pairs and\n\
  3992. should be specified if the data and bss segments are not contiguous\n\
  3993. with the text.  SECT is a section name to be loaded at SECT_ADDR."),
  3994.                &cmdlist);
  3995.   set_cmd_completer (c, filename_completer);

  3997.   c = add_cmd ("remove-symbol-file", class_files,
  3998.                remove_symbol_file_command, _("\
  3999. Remove a symbol file added via the add-symbol-file command.\n\
  4000. Usage: remove-symbol-file FILENAME\n\
  4001.        remove-symbol-file -a ADDRESS\n\
  4002. The file to remove can be identified by its filename or by an address\n\
  4003. that lies within the boundaries of this symbol file in memory."),
  4004.                &cmdlist);

  4006.   c = add_cmd ("load", class_files, load_command, _("\
  4007. Dynamically load FILE into the running program, and record its symbols\n\
  4008. for access from GDB.\n\
  4009. A load OFFSET may also be given."), &cmdlist);
  4010.   set_cmd_completer (c, filename_completer);

  4012.   add_prefix_cmd ("overlay", class_support, overlay_command,
  4013.                   _("Commands for debugging overlays."), &overlaylist,
  4014.                   "overlay ", 0, &cmdlist);

  4016.   add_com_alias ("ovly", "overlay", class_alias, 1);
  4017.   add_com_alias ("ov", "overlay", class_alias, 1);

  4019.   add_cmd ("map-overlay", class_support, map_overlay_command,
  4020.            _("Assert that an overlay section is mapped."), &overlaylist);

  4022.   add_cmd ("unmap-overlay", class_support, unmap_overlay_command,
  4023.            _("Assert that an overlay section is unmapped."), &overlaylist);

  4025.   add_cmd ("list-overlays", class_support, list_overlays_command,
  4026.            _("List mappings of overlay sections."), &overlaylist);

  4028.   add_cmd ("manual", class_support, overlay_manual_command,
  4029.            _("Enable overlay debugging."), &overlaylist);
  4030.   add_cmd ("off", class_support, overlay_off_command,
  4031.            _("Disable overlay debugging."), &overlaylist);
  4032.   add_cmd ("auto", class_support, overlay_auto_command,
  4033.            _("Enable automatic overlay debugging."), &overlaylist);
  4034.   add_cmd ("load-target", class_support, overlay_load_command,
  4035.            _("Read the overlay mapping state from the target."), &overlaylist);

  4037.   /* Filename extension to source language lookup table: */
  4038.   init_filename_language_table ();
  4039.   add_setshow_string_noescape_cmd ("extension-language", class_files,
  4040.                                    &ext_args, _("\
  4041. Set mapping between filename extension and source language."), _("\
  4042. Show mapping between filename extension and source language."), _("\
  4043. Usage: set extension-language .foo bar"),
  4044.                                    set_ext_lang_command,
  4045.                                    show_ext_args,
  4046.                                    &setlist, &showlist);

  4048.   add_info ("extensions", info_ext_lang_command,
  4049.             _("All filename extensions associated with a source language."));

  4051.   add_setshow_optional_filename_cmd ("debug-file-directory", class_support,
  4052.                                      &debug_file_directory, _("\
  4053. Set the directories where separate debug symbols are searched for."), _("\
  4054. Show the directories where separate debug symbols are searched for."), _("\
  4055. Separate debug symbols are first searched for in the same\n\
  4056. directory as the binary, then in the `" DEBUG_SUBDIRECTORY "' subdirectory,\n\
  4057. and lastly at the path of the directory of the binary with\n\
  4058. each global debug-file-directory component prepended."),
  4059.                                      NULL,
  4060.                                      show_debug_file_directory,
  4061.                                      &setlist, &showlist);

  4063.   add_setshow_enum_cmd ("symbol-loading", no_class,
  4064.                         print_symbol_loading_enums, &print_symbol_loading,
  4065.                         _("\
  4066. Set printing of symbol loading messages."), _("\
  4067. Show printing of symbol loading messages."), _("\
  4068. off   == turn all messages off\n\
  4069. brief == print messages for the executable,\n\
  4070.          and brief messages for shared libraries\n\
  4071. full  == print messages for the executable,\n\
  4072.          and messages for each shared library."),
  4073.                         NULL,
  4074.                         NULL,
  4075.                         &setprintlist, &showprintlist);
  4076. }