1 /* Generic symbol file reading for the GNU debugger, GDB.
3 Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
5 Free Software Foundation, Inc.
7 Contributed by Cygnus Support, using pieces from other GDB modules.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>. */
36 #include "breakpoint.h"
38 #include "complaints.h"
40 #include "inferior.h" /* for write_pc */
41 #include "filenames.h" /* for DOSish file names */
42 #include "gdb-stabs.h"
43 #include "gdb_obstack.h"
44 #include "completer.h"
47 #include "readline/readline.h"
48 #include "gdb_assert.h"
52 #include "parser-defs.h"
57 #include <sys/types.h>
59 #include "gdb_string.h"
66 int (*deprecated_ui_load_progress_hook
) (const char *section
, unsigned long num
);
67 void (*deprecated_show_load_progress
) (const char *section
,
68 unsigned long section_sent
,
69 unsigned long section_size
,
70 unsigned long total_sent
,
71 unsigned long total_size
);
72 void (*deprecated_pre_add_symbol_hook
) (const char *);
73 void (*deprecated_post_add_symbol_hook
) (void);
75 static void clear_symtab_users_cleanup (void *ignore
);
77 /* Global variables owned by this file */
78 int readnow_symbol_files
; /* Read full symbols immediately */
80 /* External variables and functions referenced. */
82 extern void report_transfer_performance (unsigned long, time_t, time_t);
84 /* Functions this file defines */
87 static int simple_read_overlay_region_table (void);
88 static void simple_free_overlay_region_table (void);
91 static void load_command (char *, int);
93 static void symbol_file_add_main_1 (char *args
, int from_tty
, int flags
);
95 static void add_symbol_file_command (char *, int);
97 static void add_shared_symbol_files_command (char *, int);
99 static void reread_separate_symbols (struct objfile
*objfile
);
101 static void cashier_psymtab (struct partial_symtab
*);
103 bfd
*symfile_bfd_open (char *);
105 int get_section_index (struct objfile
*, char *);
107 static struct sym_fns
*find_sym_fns (bfd
*);
109 static void decrement_reading_symtab (void *);
111 static void overlay_invalidate_all (void);
113 static int overlay_is_mapped (struct obj_section
*);
115 void list_overlays_command (char *, int);
117 void map_overlay_command (char *, int);
119 void unmap_overlay_command (char *, int);
121 static void overlay_auto_command (char *, int);
123 static void overlay_manual_command (char *, int);
125 static void overlay_off_command (char *, int);
127 static void overlay_load_command (char *, int);
129 static void overlay_command (char *, int);
131 static void simple_free_overlay_table (void);
133 static void read_target_long_array (CORE_ADDR
, unsigned int *, int);
135 static int simple_read_overlay_table (void);
137 static int simple_overlay_update_1 (struct obj_section
*);
139 static void add_filename_language (char *ext
, enum language lang
);
141 static void info_ext_lang_command (char *args
, int from_tty
);
143 static char *find_separate_debug_file (struct objfile
*objfile
);
145 static void init_filename_language_table (void);
147 static void symfile_find_segment_sections (struct objfile
*objfile
);
149 void _initialize_symfile (void);
151 /* List of all available sym_fns. On gdb startup, each object file reader
152 calls add_symtab_fns() to register information on each format it is
155 static struct sym_fns
*symtab_fns
= NULL
;
157 /* Flag for whether user will be reloading symbols multiple times.
158 Defaults to ON for VxWorks, otherwise OFF. */
160 #ifdef SYMBOL_RELOADING_DEFAULT
161 int symbol_reloading
= SYMBOL_RELOADING_DEFAULT
;
163 int symbol_reloading
= 0;
166 show_symbol_reloading (struct ui_file
*file
, int from_tty
,
167 struct cmd_list_element
*c
, const char *value
)
169 fprintf_filtered (file
, _("\
170 Dynamic symbol table reloading multiple times in one run is %s.\n"),
174 /* If non-zero, gdb will notify the user when it is loading symbols
175 from a file. This is almost always what users will want to have happen;
176 but for programs with lots of dynamically linked libraries, the output
177 can be more noise than signal. */
179 int print_symbol_loading
= 1;
181 /* If non-zero, shared library symbols will be added automatically
182 when the inferior is created, new libraries are loaded, or when
183 attaching to the inferior. This is almost always what users will
184 want to have happen; but for very large programs, the startup time
185 will be excessive, and so if this is a problem, the user can clear
186 this flag and then add the shared library symbols as needed. Note
187 that there is a potential for confusion, since if the shared
188 library symbols are not loaded, commands like "info fun" will *not*
189 report all the functions that are actually present. */
191 int auto_solib_add
= 1;
193 /* For systems that support it, a threshold size in megabytes. If
194 automatically adding a new library's symbol table to those already
195 known to the debugger would cause the total shared library symbol
196 size to exceed this threshhold, then the shlib's symbols are not
197 added. The threshold is ignored if the user explicitly asks for a
198 shlib to be added, such as when using the "sharedlibrary"
201 int auto_solib_limit
;
204 /* This compares two partial symbols by names, using strcmp_iw_ordered
205 for the comparison. */
208 compare_psymbols (const void *s1p
, const void *s2p
)
210 struct partial_symbol
*const *s1
= s1p
;
211 struct partial_symbol
*const *s2
= s2p
;
213 return strcmp_iw_ordered (SYMBOL_SEARCH_NAME (*s1
),
214 SYMBOL_SEARCH_NAME (*s2
));
218 sort_pst_symbols (struct partial_symtab
*pst
)
220 /* Sort the global list; don't sort the static list */
222 qsort (pst
->objfile
->global_psymbols
.list
+ pst
->globals_offset
,
223 pst
->n_global_syms
, sizeof (struct partial_symbol
*),
227 /* Make a null terminated copy of the string at PTR with SIZE characters in
228 the obstack pointed to by OBSTACKP . Returns the address of the copy.
229 Note that the string at PTR does not have to be null terminated, I.E. it
230 may be part of a larger string and we are only saving a substring. */
233 obsavestring (const char *ptr
, int size
, struct obstack
*obstackp
)
235 char *p
= (char *) obstack_alloc (obstackp
, size
+ 1);
236 /* Open-coded memcpy--saves function call time. These strings are usually
237 short. FIXME: Is this really still true with a compiler that can
240 const char *p1
= ptr
;
242 const char *end
= ptr
+ size
;
250 /* Concatenate strings S1, S2 and S3; return the new string. Space is found
251 in the obstack pointed to by OBSTACKP. */
254 obconcat (struct obstack
*obstackp
, const char *s1
, const char *s2
,
257 int len
= strlen (s1
) + strlen (s2
) + strlen (s3
) + 1;
258 char *val
= (char *) obstack_alloc (obstackp
, len
);
265 /* True if we are nested inside psymtab_to_symtab. */
267 int currently_reading_symtab
= 0;
270 decrement_reading_symtab (void *dummy
)
272 currently_reading_symtab
--;
275 /* Get the symbol table that corresponds to a partial_symtab.
276 This is fast after the first time you do it. In fact, there
277 is an even faster macro PSYMTAB_TO_SYMTAB that does the fast
281 psymtab_to_symtab (struct partial_symtab
*pst
)
283 /* If it's been looked up before, return it. */
287 /* If it has not yet been read in, read it. */
290 struct cleanup
*back_to
= make_cleanup (decrement_reading_symtab
, NULL
);
291 currently_reading_symtab
++;
292 (*pst
->read_symtab
) (pst
);
293 do_cleanups (back_to
);
299 /* Remember the lowest-addressed loadable section we've seen.
300 This function is called via bfd_map_over_sections.
302 In case of equal vmas, the section with the largest size becomes the
303 lowest-addressed loadable section.
305 If the vmas and sizes are equal, the last section is considered the
306 lowest-addressed loadable section. */
309 find_lowest_section (bfd
*abfd
, asection
*sect
, void *obj
)
311 asection
**lowest
= (asection
**) obj
;
313 if (0 == (bfd_get_section_flags (abfd
, sect
) & SEC_LOAD
))
316 *lowest
= sect
; /* First loadable section */
317 else if (bfd_section_vma (abfd
, *lowest
) > bfd_section_vma (abfd
, sect
))
318 *lowest
= sect
; /* A lower loadable section */
319 else if (bfd_section_vma (abfd
, *lowest
) == bfd_section_vma (abfd
, sect
)
320 && (bfd_section_size (abfd
, (*lowest
))
321 <= bfd_section_size (abfd
, sect
)))
325 /* Create a new section_addr_info, with room for NUM_SECTIONS. */
327 struct section_addr_info
*
328 alloc_section_addr_info (size_t num_sections
)
330 struct section_addr_info
*sap
;
333 size
= (sizeof (struct section_addr_info
)
334 + sizeof (struct other_sections
) * (num_sections
- 1));
335 sap
= (struct section_addr_info
*) xmalloc (size
);
336 memset (sap
, 0, size
);
337 sap
->num_sections
= num_sections
;
343 /* Return a freshly allocated copy of ADDRS. The section names, if
344 any, are also freshly allocated copies of those in ADDRS. */
345 struct section_addr_info
*
346 copy_section_addr_info (struct section_addr_info
*addrs
)
348 struct section_addr_info
*copy
349 = alloc_section_addr_info (addrs
->num_sections
);
352 copy
->num_sections
= addrs
->num_sections
;
353 for (i
= 0; i
< addrs
->num_sections
; i
++)
355 copy
->other
[i
].addr
= addrs
->other
[i
].addr
;
356 if (addrs
->other
[i
].name
)
357 copy
->other
[i
].name
= xstrdup (addrs
->other
[i
].name
);
359 copy
->other
[i
].name
= NULL
;
360 copy
->other
[i
].sectindex
= addrs
->other
[i
].sectindex
;
368 /* Build (allocate and populate) a section_addr_info struct from
369 an existing section table. */
371 extern struct section_addr_info
*
372 build_section_addr_info_from_section_table (const struct section_table
*start
,
373 const struct section_table
*end
)
375 struct section_addr_info
*sap
;
376 const struct section_table
*stp
;
379 sap
= alloc_section_addr_info (end
- start
);
381 for (stp
= start
, oidx
= 0; stp
!= end
; stp
++)
383 if (bfd_get_section_flags (stp
->bfd
,
384 stp
->the_bfd_section
) & (SEC_ALLOC
| SEC_LOAD
)
385 && oidx
< end
- start
)
387 sap
->other
[oidx
].addr
= stp
->addr
;
388 sap
->other
[oidx
].name
389 = xstrdup (bfd_section_name (stp
->bfd
, stp
->the_bfd_section
));
390 sap
->other
[oidx
].sectindex
= stp
->the_bfd_section
->index
;
399 /* Free all memory allocated by build_section_addr_info_from_section_table. */
402 free_section_addr_info (struct section_addr_info
*sap
)
406 for (idx
= 0; idx
< sap
->num_sections
; idx
++)
407 if (sap
->other
[idx
].name
)
408 xfree (sap
->other
[idx
].name
);
413 /* Initialize OBJFILE's sect_index_* members. */
415 init_objfile_sect_indices (struct objfile
*objfile
)
420 sect
= bfd_get_section_by_name (objfile
->obfd
, ".text");
422 objfile
->sect_index_text
= sect
->index
;
424 sect
= bfd_get_section_by_name (objfile
->obfd
, ".data");
426 objfile
->sect_index_data
= sect
->index
;
428 sect
= bfd_get_section_by_name (objfile
->obfd
, ".bss");
430 objfile
->sect_index_bss
= sect
->index
;
432 sect
= bfd_get_section_by_name (objfile
->obfd
, ".rodata");
434 objfile
->sect_index_rodata
= sect
->index
;
436 /* This is where things get really weird... We MUST have valid
437 indices for the various sect_index_* members or gdb will abort.
438 So if for example, there is no ".text" section, we have to
439 accomodate that. First, check for a file with the standard
440 one or two segments. */
442 symfile_find_segment_sections (objfile
);
444 /* Except when explicitly adding symbol files at some address,
445 section_offsets contains nothing but zeros, so it doesn't matter
446 which slot in section_offsets the individual sect_index_* members
447 index into. So if they are all zero, it is safe to just point
448 all the currently uninitialized indices to the first slot. But
449 beware: if this is the main executable, it may be relocated
450 later, e.g. by the remote qOffsets packet, and then this will
451 be wrong! That's why we try segments first. */
453 for (i
= 0; i
< objfile
->num_sections
; i
++)
455 if (ANOFFSET (objfile
->section_offsets
, i
) != 0)
460 if (i
== objfile
->num_sections
)
462 if (objfile
->sect_index_text
== -1)
463 objfile
->sect_index_text
= 0;
464 if (objfile
->sect_index_data
== -1)
465 objfile
->sect_index_data
= 0;
466 if (objfile
->sect_index_bss
== -1)
467 objfile
->sect_index_bss
= 0;
468 if (objfile
->sect_index_rodata
== -1)
469 objfile
->sect_index_rodata
= 0;
473 /* The arguments to place_section. */
475 struct place_section_arg
477 struct section_offsets
*offsets
;
481 /* Find a unique offset to use for loadable section SECT if
482 the user did not provide an offset. */
485 place_section (bfd
*abfd
, asection
*sect
, void *obj
)
487 struct place_section_arg
*arg
= obj
;
488 CORE_ADDR
*offsets
= arg
->offsets
->offsets
, start_addr
;
490 ULONGEST align
= ((ULONGEST
) 1) << bfd_get_section_alignment (abfd
, sect
);
492 /* We are only interested in allocated sections. */
493 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
496 /* If the user specified an offset, honor it. */
497 if (offsets
[sect
->index
] != 0)
500 /* Otherwise, let's try to find a place for the section. */
501 start_addr
= (arg
->lowest
+ align
- 1) & -align
;
508 for (cur_sec
= abfd
->sections
; cur_sec
!= NULL
; cur_sec
= cur_sec
->next
)
510 int indx
= cur_sec
->index
;
511 CORE_ADDR cur_offset
;
513 /* We don't need to compare against ourself. */
517 /* We can only conflict with allocated sections. */
518 if ((bfd_get_section_flags (abfd
, cur_sec
) & SEC_ALLOC
) == 0)
521 /* If the section offset is 0, either the section has not been placed
522 yet, or it was the lowest section placed (in which case LOWEST
523 will be past its end). */
524 if (offsets
[indx
] == 0)
527 /* If this section would overlap us, then we must move up. */
528 if (start_addr
+ bfd_get_section_size (sect
) > offsets
[indx
]
529 && start_addr
< offsets
[indx
] + bfd_get_section_size (cur_sec
))
531 start_addr
= offsets
[indx
] + bfd_get_section_size (cur_sec
);
532 start_addr
= (start_addr
+ align
- 1) & -align
;
537 /* Otherwise, we appear to be OK. So far. */
542 offsets
[sect
->index
] = start_addr
;
543 arg
->lowest
= start_addr
+ bfd_get_section_size (sect
);
546 /* Parse the user's idea of an offset for dynamic linking, into our idea
547 of how to represent it for fast symbol reading. This is the default
548 version of the sym_fns.sym_offsets function for symbol readers that
549 don't need to do anything special. It allocates a section_offsets table
550 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
553 default_symfile_offsets (struct objfile
*objfile
,
554 struct section_addr_info
*addrs
)
558 objfile
->num_sections
= bfd_count_sections (objfile
->obfd
);
559 objfile
->section_offsets
= (struct section_offsets
*)
560 obstack_alloc (&objfile
->objfile_obstack
,
561 SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
));
562 memset (objfile
->section_offsets
, 0,
563 SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
));
565 /* Now calculate offsets for section that were specified by the
567 for (i
= 0; i
< addrs
->num_sections
&& addrs
->other
[i
].name
; i
++)
569 struct other_sections
*osp
;
571 osp
= &addrs
->other
[i
] ;
575 /* Record all sections in offsets */
576 /* The section_offsets in the objfile are here filled in using
578 (objfile
->section_offsets
)->offsets
[osp
->sectindex
] = osp
->addr
;
581 /* For relocatable files, all loadable sections will start at zero.
582 The zero is meaningless, so try to pick arbitrary addresses such
583 that no loadable sections overlap. This algorithm is quadratic,
584 but the number of sections in a single object file is generally
586 if ((bfd_get_file_flags (objfile
->obfd
) & (EXEC_P
| DYNAMIC
)) == 0)
588 struct place_section_arg arg
;
589 bfd
*abfd
= objfile
->obfd
;
591 CORE_ADDR lowest
= 0;
593 for (cur_sec
= abfd
->sections
; cur_sec
!= NULL
; cur_sec
= cur_sec
->next
)
594 /* We do not expect this to happen; just skip this step if the
595 relocatable file has a section with an assigned VMA. */
596 if (bfd_section_vma (abfd
, cur_sec
) != 0)
601 CORE_ADDR
*offsets
= objfile
->section_offsets
->offsets
;
603 /* Pick non-overlapping offsets for sections the user did not
605 arg
.offsets
= objfile
->section_offsets
;
607 bfd_map_over_sections (objfile
->obfd
, place_section
, &arg
);
609 /* Correctly filling in the section offsets is not quite
610 enough. Relocatable files have two properties that
611 (most) shared objects do not:
613 - Their debug information will contain relocations. Some
614 shared libraries do also, but many do not, so this can not
617 - If there are multiple code sections they will be loaded
618 at different relative addresses in memory than they are
619 in the objfile, since all sections in the file will start
622 Because GDB has very limited ability to map from an
623 address in debug info to the correct code section,
624 it relies on adding SECT_OFF_TEXT to things which might be
625 code. If we clear all the section offsets, and set the
626 section VMAs instead, then symfile_relocate_debug_section
627 will return meaningful debug information pointing at the
630 GDB has too many different data structures for section
631 addresses - a bfd, objfile, and so_list all have section
632 tables, as does exec_ops. Some of these could probably
635 for (cur_sec
= abfd
->sections
; cur_sec
!= NULL
;
636 cur_sec
= cur_sec
->next
)
638 if ((bfd_get_section_flags (abfd
, cur_sec
) & SEC_ALLOC
) == 0)
641 bfd_set_section_vma (abfd
, cur_sec
, offsets
[cur_sec
->index
]);
642 exec_set_section_address (bfd_get_filename (abfd
), cur_sec
->index
,
643 offsets
[cur_sec
->index
]);
644 offsets
[cur_sec
->index
] = 0;
649 /* Remember the bfd indexes for the .text, .data, .bss and
651 init_objfile_sect_indices (objfile
);
655 /* Divide the file into segments, which are individual relocatable units.
656 This is the default version of the sym_fns.sym_segments function for
657 symbol readers that do not have an explicit representation of segments.
658 It assumes that object files do not have segments, and fully linked
659 files have a single segment. */
661 struct symfile_segment_data
*
662 default_symfile_segments (bfd
*abfd
)
666 struct symfile_segment_data
*data
;
669 /* Relocatable files contain enough information to position each
670 loadable section independently; they should not be relocated
672 if ((bfd_get_file_flags (abfd
) & (EXEC_P
| DYNAMIC
)) == 0)
675 /* Make sure there is at least one loadable section in the file. */
676 for (sect
= abfd
->sections
; sect
!= NULL
; sect
= sect
->next
)
678 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
686 low
= bfd_get_section_vma (abfd
, sect
);
687 high
= low
+ bfd_get_section_size (sect
);
689 data
= XZALLOC (struct symfile_segment_data
);
690 data
->num_segments
= 1;
691 data
->segment_bases
= XCALLOC (1, CORE_ADDR
);
692 data
->segment_sizes
= XCALLOC (1, CORE_ADDR
);
694 num_sections
= bfd_count_sections (abfd
);
695 data
->segment_info
= XCALLOC (num_sections
, int);
697 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
701 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
704 vma
= bfd_get_section_vma (abfd
, sect
);
707 if (vma
+ bfd_get_section_size (sect
) > high
)
708 high
= vma
+ bfd_get_section_size (sect
);
710 data
->segment_info
[i
] = 1;
713 data
->segment_bases
[0] = low
;
714 data
->segment_sizes
[0] = high
- low
;
719 /* Process a symbol file, as either the main file or as a dynamically
722 OBJFILE is where the symbols are to be read from.
724 ADDRS is the list of section load addresses. If the user has given
725 an 'add-symbol-file' command, then this is the list of offsets and
726 addresses he or she provided as arguments to the command; or, if
727 we're handling a shared library, these are the actual addresses the
728 sections are loaded at, according to the inferior's dynamic linker
729 (as gleaned by GDB's shared library code). We convert each address
730 into an offset from the section VMA's as it appears in the object
731 file, and then call the file's sym_offsets function to convert this
732 into a format-specific offset table --- a `struct section_offsets'.
733 If ADDRS is non-zero, OFFSETS must be zero.
735 OFFSETS is a table of section offsets already in the right
736 format-specific representation. NUM_OFFSETS is the number of
737 elements present in OFFSETS->offsets. If OFFSETS is non-zero, we
738 assume this is the proper table the call to sym_offsets described
739 above would produce. Instead of calling sym_offsets, we just dump
740 it right into objfile->section_offsets. (When we're re-reading
741 symbols from an objfile, we don't have the original load address
742 list any more; all we have is the section offset table.) If
743 OFFSETS is non-zero, ADDRS must be zero.
745 MAINLINE is nonzero if this is the main symbol file, or zero if
746 it's an extra symbol file such as dynamically loaded code.
748 VERBO is nonzero if the caller has printed a verbose message about
749 the symbol reading (and complaints can be more terse about it). */
752 syms_from_objfile (struct objfile
*objfile
,
753 struct section_addr_info
*addrs
,
754 struct section_offsets
*offsets
,
759 struct section_addr_info
*local_addr
= NULL
;
760 struct cleanup
*old_chain
;
762 gdb_assert (! (addrs
&& offsets
));
764 init_entry_point_info (objfile
);
765 objfile
->sf
= find_sym_fns (objfile
->obfd
);
767 if (objfile
->sf
== NULL
)
768 return; /* No symbols. */
770 /* Make sure that partially constructed symbol tables will be cleaned up
771 if an error occurs during symbol reading. */
772 old_chain
= make_cleanup_free_objfile (objfile
);
774 /* If ADDRS and OFFSETS are both NULL, put together a dummy address
775 list. We now establish the convention that an addr of zero means
776 no load address was specified. */
777 if (! addrs
&& ! offsets
)
780 = alloc_section_addr_info (bfd_count_sections (objfile
->obfd
));
781 make_cleanup (xfree
, local_addr
);
785 /* Now either addrs or offsets is non-zero. */
789 /* We will modify the main symbol table, make sure that all its users
790 will be cleaned up if an error occurs during symbol reading. */
791 make_cleanup (clear_symtab_users_cleanup
, 0 /*ignore*/);
793 /* Since no error yet, throw away the old symbol table. */
795 if (symfile_objfile
!= NULL
)
797 free_objfile (symfile_objfile
);
798 symfile_objfile
= NULL
;
801 /* Currently we keep symbols from the add-symbol-file command.
802 If the user wants to get rid of them, they should do "symbol-file"
803 without arguments first. Not sure this is the best behavior
806 (*objfile
->sf
->sym_new_init
) (objfile
);
809 /* Convert addr into an offset rather than an absolute address.
810 We find the lowest address of a loaded segment in the objfile,
811 and assume that <addr> is where that got loaded.
813 We no longer warn if the lowest section is not a text segment (as
814 happens for the PA64 port. */
815 if (!mainline
&& addrs
&& addrs
->other
[0].name
)
817 asection
*lower_sect
;
819 CORE_ADDR lower_offset
;
822 /* Find lowest loadable section to be used as starting point for
823 continguous sections. FIXME!! won't work without call to find
824 .text first, but this assumes text is lowest section. */
825 lower_sect
= bfd_get_section_by_name (objfile
->obfd
, ".text");
826 if (lower_sect
== NULL
)
827 bfd_map_over_sections (objfile
->obfd
, find_lowest_section
,
829 if (lower_sect
== NULL
)
831 warning (_("no loadable sections found in added symbol-file %s"),
836 lower_offset
= bfd_section_vma (objfile
->obfd
, lower_sect
);
838 /* Calculate offsets for the loadable sections.
839 FIXME! Sections must be in order of increasing loadable section
840 so that contiguous sections can use the lower-offset!!!
842 Adjust offsets if the segments are not contiguous.
843 If the section is contiguous, its offset should be set to
844 the offset of the highest loadable section lower than it
845 (the loadable section directly below it in memory).
846 this_offset = lower_offset = lower_addr - lower_orig_addr */
848 for (i
= 0; i
< addrs
->num_sections
&& addrs
->other
[i
].name
; i
++)
850 if (addrs
->other
[i
].addr
!= 0)
852 sect
= bfd_get_section_by_name (objfile
->obfd
,
853 addrs
->other
[i
].name
);
857 -= bfd_section_vma (objfile
->obfd
, sect
);
858 lower_offset
= addrs
->other
[i
].addr
;
859 /* This is the index used by BFD. */
860 addrs
->other
[i
].sectindex
= sect
->index
;
864 warning (_("section %s not found in %s"),
865 addrs
->other
[i
].name
,
867 addrs
->other
[i
].addr
= 0;
871 addrs
->other
[i
].addr
= lower_offset
;
875 /* Initialize symbol reading routines for this objfile, allow complaints to
876 appear for this new file, and record how verbose to be, then do the
877 initial symbol reading for this file. */
879 (*objfile
->sf
->sym_init
) (objfile
);
880 clear_complaints (&symfile_complaints
, 1, verbo
);
883 (*objfile
->sf
->sym_offsets
) (objfile
, addrs
);
886 size_t size
= SIZEOF_N_SECTION_OFFSETS (num_offsets
);
888 /* Just copy in the offset table directly as given to us. */
889 objfile
->num_sections
= num_offsets
;
890 objfile
->section_offsets
891 = ((struct section_offsets
*)
892 obstack_alloc (&objfile
->objfile_obstack
, size
));
893 memcpy (objfile
->section_offsets
, offsets
, size
);
895 init_objfile_sect_indices (objfile
);
898 #ifndef DEPRECATED_IBM6000_TARGET
899 /* This is a SVR4/SunOS specific hack, I think. In any event, it
900 screws RS/6000. sym_offsets should be doing this sort of thing,
901 because it knows the mapping between bfd sections and
903 /* This is a hack. As far as I can tell, section offsets are not
904 target dependent. They are all set to addr with a couple of
905 exceptions. The exceptions are sysvr4 shared libraries, whose
906 offsets are kept in solib structures anyway and rs6000 xcoff
907 which handles shared libraries in a completely unique way.
909 Section offsets are built similarly, except that they are built
910 by adding addr in all cases because there is no clear mapping
911 from section_offsets into actual sections. Note that solib.c
912 has a different algorithm for finding section offsets.
914 These should probably all be collapsed into some target
915 independent form of shared library support. FIXME. */
919 struct obj_section
*s
;
921 /* Map section offsets in "addr" back to the object's
922 sections by comparing the section names with bfd's
923 section names. Then adjust the section address by
924 the offset. */ /* for gdb/13815 */
926 ALL_OBJFILE_OSECTIONS (objfile
, s
)
928 CORE_ADDR s_addr
= 0;
932 !s_addr
&& i
< addrs
->num_sections
&& addrs
->other
[i
].name
;
934 if (strcmp (bfd_section_name (s
->objfile
->obfd
,
936 addrs
->other
[i
].name
) == 0)
937 s_addr
= addrs
->other
[i
].addr
; /* end added for gdb/13815 */
939 s
->addr
-= s
->offset
;
941 s
->endaddr
-= s
->offset
;
942 s
->endaddr
+= s_addr
;
946 #endif /* not DEPRECATED_IBM6000_TARGET */
948 (*objfile
->sf
->sym_read
) (objfile
, mainline
);
950 /* Don't allow char * to have a typename (else would get caddr_t).
951 Ditto void *. FIXME: Check whether this is now done by all the
952 symbol readers themselves (many of them now do), and if so remove
955 TYPE_NAME (lookup_pointer_type (builtin_type_char
)) = 0;
956 TYPE_NAME (lookup_pointer_type (builtin_type_void
)) = 0;
958 /* Mark the objfile has having had initial symbol read attempted. Note
959 that this does not mean we found any symbols... */
961 objfile
->flags
|= OBJF_SYMS
;
963 /* Discard cleanups as symbol reading was successful. */
965 discard_cleanups (old_chain
);
968 /* Perform required actions after either reading in the initial
969 symbols for a new objfile, or mapping in the symbols from a reusable
973 new_symfile_objfile (struct objfile
*objfile
, int mainline
, int verbo
)
976 /* If this is the main symbol file we have to clean up all users of the
977 old main symbol file. Otherwise it is sufficient to fixup all the
978 breakpoints that may have been redefined by this symbol file. */
981 /* OK, make it the "real" symbol file. */
982 symfile_objfile
= objfile
;
984 clear_symtab_users ();
988 breakpoint_re_set ();
991 /* We're done reading the symbol file; finish off complaints. */
992 clear_complaints (&symfile_complaints
, 0, verbo
);
995 /* Process a symbol file, as either the main file or as a dynamically
998 ABFD is a BFD already open on the file, as from symfile_bfd_open.
999 This BFD will be closed on error, and is always consumed by this function.
1001 FROM_TTY says how verbose to be.
1003 MAINLINE specifies whether this is the main symbol file, or whether
1004 it's an extra symbol file such as dynamically loaded code.
1006 ADDRS, OFFSETS, and NUM_OFFSETS are as described for
1007 syms_from_objfile, above. ADDRS is ignored when MAINLINE is
1010 Upon success, returns a pointer to the objfile that was added.
1011 Upon failure, jumps back to command level (never returns). */
1012 static struct objfile
*
1013 symbol_file_add_with_addrs_or_offsets (bfd
*abfd
, int from_tty
,
1014 struct section_addr_info
*addrs
,
1015 struct section_offsets
*offsets
,
1017 int mainline
, int flags
)
1019 struct objfile
*objfile
;
1020 struct partial_symtab
*psymtab
;
1021 char *debugfile
= NULL
;
1022 struct section_addr_info
*orig_addrs
= NULL
;
1023 struct cleanup
*my_cleanups
;
1024 const char *name
= bfd_get_filename (abfd
);
1026 my_cleanups
= make_cleanup_bfd_close (abfd
);
1028 /* Give user a chance to burp if we'd be
1029 interactively wiping out any existing symbols. */
1031 if ((have_full_symbols () || have_partial_symbols ())
1034 && !query ("Load new symbol table from \"%s\"? ", name
))
1035 error (_("Not confirmed."));
1037 objfile
= allocate_objfile (abfd
, flags
);
1038 discard_cleanups (my_cleanups
);
1042 orig_addrs
= copy_section_addr_info (addrs
);
1043 make_cleanup_free_section_addr_info (orig_addrs
);
1046 /* We either created a new mapped symbol table, mapped an existing
1047 symbol table file which has not had initial symbol reading
1048 performed, or need to read an unmapped symbol table. */
1049 if (from_tty
|| info_verbose
)
1051 if (deprecated_pre_add_symbol_hook
)
1052 deprecated_pre_add_symbol_hook (name
);
1055 if (print_symbol_loading
)
1057 printf_unfiltered (_("Reading symbols from %s..."), name
);
1059 gdb_flush (gdb_stdout
);
1063 syms_from_objfile (objfile
, addrs
, offsets
, num_offsets
,
1064 mainline
, from_tty
);
1066 /* We now have at least a partial symbol table. Check to see if the
1067 user requested that all symbols be read on initial access via either
1068 the gdb startup command line or on a per symbol file basis. Expand
1069 all partial symbol tables for this objfile if so. */
1071 if ((flags
& OBJF_READNOW
) || readnow_symbol_files
)
1073 if ((from_tty
|| info_verbose
) && print_symbol_loading
)
1075 printf_unfiltered (_("expanding to full symbols..."));
1077 gdb_flush (gdb_stdout
);
1080 for (psymtab
= objfile
->psymtabs
;
1082 psymtab
= psymtab
->next
)
1084 psymtab_to_symtab (psymtab
);
1088 /* If the file has its own symbol tables it has no separate debug info.
1089 `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to SYMTABS/PSYMTABS.
1090 `.gnu_debuglink' may no longer be present with `.note.gnu.build-id'. */
1091 if (objfile
->psymtabs
== NULL
)
1092 debugfile
= find_separate_debug_file (objfile
);
1097 objfile
->separate_debug_objfile
1098 = symbol_file_add (debugfile
, from_tty
, orig_addrs
, 0, flags
);
1102 objfile
->separate_debug_objfile
1103 = symbol_file_add (debugfile
, from_tty
, NULL
, 0, flags
);
1105 objfile
->separate_debug_objfile
->separate_debug_objfile_backlink
1108 /* Put the separate debug object before the normal one, this is so that
1109 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
1110 put_objfile_before (objfile
->separate_debug_objfile
, objfile
);
1115 if (!have_partial_symbols () && !have_full_symbols ()
1116 && print_symbol_loading
)
1119 printf_filtered (_("(no debugging symbols found)"));
1120 if (from_tty
|| info_verbose
)
1121 printf_filtered ("...");
1123 printf_filtered ("\n");
1127 if (from_tty
|| info_verbose
)
1129 if (deprecated_post_add_symbol_hook
)
1130 deprecated_post_add_symbol_hook ();
1133 if (print_symbol_loading
)
1134 printf_unfiltered (_("done.\n"));
1138 /* We print some messages regardless of whether 'from_tty ||
1139 info_verbose' is true, so make sure they go out at the right
1141 gdb_flush (gdb_stdout
);
1143 do_cleanups (my_cleanups
);
1145 if (objfile
->sf
== NULL
)
1146 return objfile
; /* No symbols. */
1148 new_symfile_objfile (objfile
, mainline
, from_tty
);
1150 observer_notify_new_objfile (objfile
);
1152 bfd_cache_close_all ();
1157 /* Process the symbol file ABFD, as either the main file or as a
1158 dynamically loaded file.
1160 See symbol_file_add_with_addrs_or_offsets's comments for
1163 symbol_file_add_from_bfd (bfd
*abfd
, int from_tty
,
1164 struct section_addr_info
*addrs
,
1165 int mainline
, int flags
)
1167 return symbol_file_add_with_addrs_or_offsets (abfd
,
1168 from_tty
, addrs
, 0, 0,
1173 /* Process a symbol file, as either the main file or as a dynamically
1174 loaded file. See symbol_file_add_with_addrs_or_offsets's comments
1177 symbol_file_add (char *name
, int from_tty
, struct section_addr_info
*addrs
,
1178 int mainline
, int flags
)
1180 return symbol_file_add_from_bfd (symfile_bfd_open (name
), from_tty
,
1181 addrs
, mainline
, flags
);
1185 /* Call symbol_file_add() with default values and update whatever is
1186 affected by the loading of a new main().
1187 Used when the file is supplied in the gdb command line
1188 and by some targets with special loading requirements.
1189 The auxiliary function, symbol_file_add_main_1(), has the flags
1190 argument for the switches that can only be specified in the symbol_file
1194 symbol_file_add_main (char *args
, int from_tty
)
1196 symbol_file_add_main_1 (args
, from_tty
, 0);
1200 symbol_file_add_main_1 (char *args
, int from_tty
, int flags
)
1202 symbol_file_add (args
, from_tty
, NULL
, 1, flags
);
1204 /* Getting new symbols may change our opinion about
1205 what is frameless. */
1206 reinit_frame_cache ();
1208 set_initial_language ();
1212 symbol_file_clear (int from_tty
)
1214 if ((have_full_symbols () || have_partial_symbols ())
1217 ? !query (_("Discard symbol table from `%s'? "),
1218 symfile_objfile
->name
)
1219 : !query (_("Discard symbol table? "))))
1220 error (_("Not confirmed."));
1221 free_all_objfiles ();
1223 /* solib descriptors may have handles to objfiles. Since their
1224 storage has just been released, we'd better wipe the solib
1225 descriptors as well.
1227 no_shared_libraries (NULL
, from_tty
);
1229 symfile_objfile
= NULL
;
1231 printf_unfiltered (_("No symbol file now.\n"));
1240 /* Locate NT_GNU_BUILD_ID from ABFD and return its content. */
1242 static struct build_id
*
1243 build_id_bfd_get (bfd
*abfd
)
1245 struct build_id
*retval
;
1247 if (!bfd_check_format (abfd
, bfd_object
)
1248 || bfd_get_flavour (abfd
) != bfd_target_elf_flavour
1249 || elf_tdata (abfd
)->build_id
== NULL
)
1252 retval
= xmalloc (sizeof *retval
- 1 + elf_tdata (abfd
)->build_id_size
);
1253 retval
->size
= elf_tdata (abfd
)->build_id_size
;
1254 memcpy (retval
->data
, elf_tdata (abfd
)->build_id
, retval
->size
);
1259 /* Return if FILENAME has NT_GNU_BUILD_ID matching the CHECK value. */
1262 build_id_verify (const char *filename
, struct build_id
*check
)
1265 struct build_id
*found
= NULL
;
1268 /* We expect to be silent on the non-existing files. */
1269 abfd
= bfd_openr (filename
, gnutarget
);
1273 found
= build_id_bfd_get (abfd
);
1276 warning (_("File \"%s\" has no build-id, file skipped"), filename
);
1277 else if (found
->size
!= check
->size
1278 || memcmp (found
->data
, check
->data
, found
->size
) != 0)
1279 warning (_("File \"%s\" has a different build-id, file skipped"), filename
);
1283 if (!bfd_close (abfd
))
1284 warning (_("cannot close \"%s\": %s"), filename
,
1285 bfd_errmsg (bfd_get_error ()));
1290 build_id_to_debug_filename (struct build_id
*build_id
)
1292 char *link
, *s
, *retval
= NULL
;
1293 gdb_byte
*data
= build_id
->data
;
1294 size_t size
= build_id
->size
;
1296 /* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */
1297 link
= xmalloc (strlen (debug_file_directory
) + (sizeof "/.build-id/" - 1) + 1
1298 + 2 * size
+ (sizeof ".debug" - 1) + 1);
1299 s
= link
+ sprintf (link
, "%s/.build-id/", debug_file_directory
);
1303 s
+= sprintf (s
, "%02x", (unsigned) *data
++);
1308 s
+= sprintf (s
, "%02x", (unsigned) *data
++);
1309 strcpy (s
, ".debug");
1311 /* lrealpath() is expensive even for the usually non-existent files. */
1312 if (access (link
, F_OK
) == 0)
1313 retval
= lrealpath (link
);
1316 if (retval
!= NULL
&& !build_id_verify (retval
, build_id
))
1326 get_debug_link_info (struct objfile
*objfile
, unsigned long *crc32_out
)
1329 bfd_size_type debuglink_size
;
1330 unsigned long crc32
;
1335 sect
= bfd_get_section_by_name (objfile
->obfd
, ".gnu_debuglink");
1340 debuglink_size
= bfd_section_size (objfile
->obfd
, sect
);
1342 contents
= xmalloc (debuglink_size
);
1343 bfd_get_section_contents (objfile
->obfd
, sect
, contents
,
1344 (file_ptr
)0, (bfd_size_type
)debuglink_size
);
1346 /* Crc value is stored after the filename, aligned up to 4 bytes. */
1347 crc_offset
= strlen (contents
) + 1;
1348 crc_offset
= (crc_offset
+ 3) & ~3;
1350 crc32
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) (contents
+ crc_offset
));
1357 separate_debug_file_exists (const char *name
, unsigned long crc
)
1359 unsigned long file_crc
= 0;
1361 gdb_byte buffer
[8*1024];
1364 fd
= open (name
, O_RDONLY
| O_BINARY
);
1368 while ((count
= read (fd
, buffer
, sizeof (buffer
))) > 0)
1369 file_crc
= gnu_debuglink_crc32 (file_crc
, buffer
, count
);
1373 return crc
== file_crc
;
1376 char *debug_file_directory
= NULL
;
1378 show_debug_file_directory (struct ui_file
*file
, int from_tty
,
1379 struct cmd_list_element
*c
, const char *value
)
1381 fprintf_filtered (file
, _("\
1382 The directory where separate debug symbols are searched for is \"%s\".\n"),
1386 #if ! defined (DEBUG_SUBDIRECTORY)
1387 #define DEBUG_SUBDIRECTORY ".debug"
1391 find_separate_debug_file (struct objfile
*objfile
)
1399 bfd_size_type debuglink_size
;
1400 unsigned long crc32
;
1402 struct build_id
*build_id
;
1404 build_id
= build_id_bfd_get (objfile
->obfd
);
1405 if (build_id
!= NULL
)
1407 char *build_id_name
;
1409 build_id_name
= build_id_to_debug_filename (build_id
);
1411 /* Prevent looping on a stripped .debug file. */
1412 if (build_id_name
!= NULL
&& strcmp (build_id_name
, objfile
->name
) == 0)
1414 warning (_("\"%s\": separate debug info file has no debug info"),
1416 xfree (build_id_name
);
1418 else if (build_id_name
!= NULL
)
1419 return build_id_name
;
1422 basename
= get_debug_link_info (objfile
, &crc32
);
1424 if (basename
== NULL
)
1427 dir
= xstrdup (objfile
->name
);
1429 /* Strip off the final filename part, leaving the directory name,
1430 followed by a slash. Objfile names should always be absolute and
1431 tilde-expanded, so there should always be a slash in there
1433 for (i
= strlen(dir
) - 1; i
>= 0; i
--)
1435 if (IS_DIR_SEPARATOR (dir
[i
]))
1438 gdb_assert (i
>= 0 && IS_DIR_SEPARATOR (dir
[i
]));
1441 debugfile
= alloca (strlen (debug_file_directory
) + 1
1443 + strlen (DEBUG_SUBDIRECTORY
)
1448 /* First try in the same directory as the original file. */
1449 strcpy (debugfile
, dir
);
1450 strcat (debugfile
, basename
);
1452 if (separate_debug_file_exists (debugfile
, crc32
))
1456 return xstrdup (debugfile
);
1459 /* Then try in the subdirectory named DEBUG_SUBDIRECTORY. */
1460 strcpy (debugfile
, dir
);
1461 strcat (debugfile
, DEBUG_SUBDIRECTORY
);
1462 strcat (debugfile
, "/");
1463 strcat (debugfile
, basename
);
1465 if (separate_debug_file_exists (debugfile
, crc32
))
1469 return xstrdup (debugfile
);
1472 /* Then try in the global debugfile directory. */
1473 strcpy (debugfile
, debug_file_directory
);
1474 strcat (debugfile
, "/");
1475 strcat (debugfile
, dir
);
1476 strcat (debugfile
, basename
);
1478 if (separate_debug_file_exists (debugfile
, crc32
))
1482 return xstrdup (debugfile
);
1485 /* If the file is in the sysroot, try using its base path in the
1486 global debugfile directory. */
1487 canon_name
= lrealpath (dir
);
1489 && strncmp (canon_name
, gdb_sysroot
, strlen (gdb_sysroot
)) == 0
1490 && IS_DIR_SEPARATOR (canon_name
[strlen (gdb_sysroot
)]))
1492 strcpy (debugfile
, debug_file_directory
);
1493 strcat (debugfile
, canon_name
+ strlen (gdb_sysroot
));
1494 strcat (debugfile
, "/");
1495 strcat (debugfile
, basename
);
1497 if (separate_debug_file_exists (debugfile
, crc32
))
1502 return xstrdup (debugfile
);
1515 /* This is the symbol-file command. Read the file, analyze its
1516 symbols, and add a struct symtab to a symtab list. The syntax of
1517 the command is rather bizarre:
1519 1. The function buildargv implements various quoting conventions
1520 which are undocumented and have little or nothing in common with
1521 the way things are quoted (or not quoted) elsewhere in GDB.
1523 2. Options are used, which are not generally used in GDB (perhaps
1524 "set mapped on", "set readnow on" would be better)
1526 3. The order of options matters, which is contrary to GNU
1527 conventions (because it is confusing and inconvenient). */
1530 symbol_file_command (char *args
, int from_tty
)
1536 symbol_file_clear (from_tty
);
1540 char **argv
= buildargv (args
);
1541 int flags
= OBJF_USERLOADED
;
1542 struct cleanup
*cleanups
;
1548 cleanups
= make_cleanup_freeargv (argv
);
1549 while (*argv
!= NULL
)
1551 if (strcmp (*argv
, "-readnow") == 0)
1552 flags
|= OBJF_READNOW
;
1553 else if (**argv
== '-')
1554 error (_("unknown option `%s'"), *argv
);
1557 symbol_file_add_main_1 (*argv
, from_tty
, flags
);
1565 error (_("no symbol file name was specified"));
1567 do_cleanups (cleanups
);
1571 /* Set the initial language.
1573 FIXME: A better solution would be to record the language in the
1574 psymtab when reading partial symbols, and then use it (if known) to
1575 set the language. This would be a win for formats that encode the
1576 language in an easily discoverable place, such as DWARF. For
1577 stabs, we can jump through hoops looking for specially named
1578 symbols or try to intuit the language from the specific type of
1579 stabs we find, but we can't do that until later when we read in
1583 set_initial_language (void)
1585 struct partial_symtab
*pst
;
1586 enum language lang
= language_unknown
;
1588 pst
= find_main_psymtab ();
1591 if (pst
->filename
!= NULL
)
1592 lang
= deduce_language_from_filename (pst
->filename
);
1594 if (lang
== language_unknown
)
1596 /* Make C the default language */
1600 set_language (lang
);
1601 expected_language
= current_language
; /* Don't warn the user. */
1605 /* Open the file specified by NAME and hand it off to BFD for
1606 preliminary analysis. Return a newly initialized bfd *, which
1607 includes a newly malloc'd` copy of NAME (tilde-expanded and made
1608 absolute). In case of trouble, error() is called. */
1611 symfile_bfd_open (char *name
)
1615 char *absolute_name
;
1617 name
= tilde_expand (name
); /* Returns 1st new malloc'd copy. */
1619 /* Look down path for it, allocate 2nd new malloc'd copy. */
1620 desc
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
, name
,
1621 O_RDONLY
| O_BINARY
, 0, &absolute_name
);
1622 #if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__)
1625 char *exename
= alloca (strlen (name
) + 5);
1626 strcat (strcpy (exename
, name
), ".exe");
1627 desc
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
, exename
,
1628 O_RDONLY
| O_BINARY
, 0, &absolute_name
);
1633 make_cleanup (xfree
, name
);
1634 perror_with_name (name
);
1637 /* Free 1st new malloc'd copy, but keep the 2nd malloc'd copy in
1638 bfd. It'll be freed in free_objfile(). */
1640 name
= absolute_name
;
1642 sym_bfd
= bfd_fopen (name
, gnutarget
, FOPEN_RB
, desc
);
1646 make_cleanup (xfree
, name
);
1647 error (_("\"%s\": can't open to read symbols: %s."), name
,
1648 bfd_errmsg (bfd_get_error ()));
1650 bfd_set_cacheable (sym_bfd
, 1);
1652 if (!bfd_check_format (sym_bfd
, bfd_object
))
1654 /* FIXME: should be checking for errors from bfd_close (for one
1655 thing, on error it does not free all the storage associated
1657 bfd_close (sym_bfd
); /* This also closes desc. */
1658 make_cleanup (xfree
, name
);
1659 error (_("\"%s\": can't read symbols: %s."), name
,
1660 bfd_errmsg (bfd_get_error ()));
1666 /* Return the section index for SECTION_NAME on OBJFILE. Return -1 if
1667 the section was not found. */
1670 get_section_index (struct objfile
*objfile
, char *section_name
)
1672 asection
*sect
= bfd_get_section_by_name (objfile
->obfd
, section_name
);
1680 /* Link SF into the global symtab_fns list. Called on startup by the
1681 _initialize routine in each object file format reader, to register
1682 information about each format the the reader is prepared to
1686 add_symtab_fns (struct sym_fns
*sf
)
1688 sf
->next
= symtab_fns
;
1692 /* Initialize OBJFILE to read symbols from its associated BFD. It
1693 either returns or calls error(). The result is an initialized
1694 struct sym_fns in the objfile structure, that contains cached
1695 information about the symbol file. */
1697 static struct sym_fns
*
1698 find_sym_fns (bfd
*abfd
)
1701 enum bfd_flavour our_flavour
= bfd_get_flavour (abfd
);
1703 if (our_flavour
== bfd_target_srec_flavour
1704 || our_flavour
== bfd_target_ihex_flavour
1705 || our_flavour
== bfd_target_tekhex_flavour
)
1706 return NULL
; /* No symbols. */
1708 for (sf
= symtab_fns
; sf
!= NULL
; sf
= sf
->next
)
1709 if (our_flavour
== sf
->sym_flavour
)
1712 error (_("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown."),
1713 bfd_get_target (abfd
));
1717 /* This function runs the load command of our current target. */
1720 load_command (char *arg
, int from_tty
)
1722 /* The user might be reloading because the binary has changed. Take
1723 this opportunity to check. */
1724 reopen_exec_file ();
1732 parg
= arg
= get_exec_file (1);
1734 /* Count how many \ " ' tab space there are in the name. */
1735 while ((parg
= strpbrk (parg
, "\\\"'\t ")))
1743 /* We need to quote this string so buildargv can pull it apart. */
1744 char *temp
= xmalloc (strlen (arg
) + count
+ 1 );
1748 make_cleanup (xfree
, temp
);
1751 while ((parg
= strpbrk (parg
, "\\\"'\t ")))
1753 strncpy (ptemp
, prev
, parg
- prev
);
1754 ptemp
+= parg
- prev
;
1758 strcpy (ptemp
, prev
);
1764 target_load (arg
, from_tty
);
1766 /* After re-loading the executable, we don't really know which
1767 overlays are mapped any more. */
1768 overlay_cache_invalid
= 1;
1771 /* This version of "load" should be usable for any target. Currently
1772 it is just used for remote targets, not inftarg.c or core files,
1773 on the theory that only in that case is it useful.
1775 Avoiding xmodem and the like seems like a win (a) because we don't have
1776 to worry about finding it, and (b) On VMS, fork() is very slow and so
1777 we don't want to run a subprocess. On the other hand, I'm not sure how
1778 performance compares. */
1780 static int validate_download
= 0;
1782 /* Callback service function for generic_load (bfd_map_over_sections). */
1785 add_section_size_callback (bfd
*abfd
, asection
*asec
, void *data
)
1787 bfd_size_type
*sum
= data
;
1789 *sum
+= bfd_get_section_size (asec
);
1792 /* Opaque data for load_section_callback. */
1793 struct load_section_data
{
1794 unsigned long load_offset
;
1795 struct load_progress_data
*progress_data
;
1796 VEC(memory_write_request_s
) *requests
;
1799 /* Opaque data for load_progress. */
1800 struct load_progress_data
{
1801 /* Cumulative data. */
1802 unsigned long write_count
;
1803 unsigned long data_count
;
1804 bfd_size_type total_size
;
1807 /* Opaque data for load_progress for a single section. */
1808 struct load_progress_section_data
{
1809 struct load_progress_data
*cumulative
;
1811 /* Per-section data. */
1812 const char *section_name
;
1813 ULONGEST section_sent
;
1814 ULONGEST section_size
;
1819 /* Target write callback routine for progress reporting. */
1822 load_progress (ULONGEST bytes
, void *untyped_arg
)
1824 struct load_progress_section_data
*args
= untyped_arg
;
1825 struct load_progress_data
*totals
;
1828 /* Writing padding data. No easy way to get at the cumulative
1829 stats, so just ignore this. */
1832 totals
= args
->cumulative
;
1834 if (bytes
== 0 && args
->section_sent
== 0)
1836 /* The write is just starting. Let the user know we've started
1838 ui_out_message (uiout
, 0, "Loading section %s, size 0x%s lma 0x%s\n",
1839 args
->section_name
, paddr_nz (args
->section_size
),
1840 paddr_nz (args
->lma
));
1844 if (validate_download
)
1846 /* Broken memories and broken monitors manifest themselves here
1847 when bring new computers to life. This doubles already slow
1849 /* NOTE: cagney/1999-10-18: A more efficient implementation
1850 might add a verify_memory() method to the target vector and
1851 then use that. remote.c could implement that method using
1852 the ``qCRC'' packet. */
1853 gdb_byte
*check
= xmalloc (bytes
);
1854 struct cleanup
*verify_cleanups
= make_cleanup (xfree
, check
);
1856 if (target_read_memory (args
->lma
, check
, bytes
) != 0)
1857 error (_("Download verify read failed at 0x%s"),
1859 if (memcmp (args
->buffer
, check
, bytes
) != 0)
1860 error (_("Download verify compare failed at 0x%s"),
1862 do_cleanups (verify_cleanups
);
1864 totals
->data_count
+= bytes
;
1866 args
->buffer
+= bytes
;
1867 totals
->write_count
+= 1;
1868 args
->section_sent
+= bytes
;
1870 || (deprecated_ui_load_progress_hook
!= NULL
1871 && deprecated_ui_load_progress_hook (args
->section_name
,
1872 args
->section_sent
)))
1873 error (_("Canceled the download"));
1875 if (deprecated_show_load_progress
!= NULL
)
1876 deprecated_show_load_progress (args
->section_name
,
1880 totals
->total_size
);
1883 /* Callback service function for generic_load (bfd_map_over_sections). */
1886 load_section_callback (bfd
*abfd
, asection
*asec
, void *data
)
1888 struct memory_write_request
*new_request
;
1889 struct load_section_data
*args
= data
;
1890 struct load_progress_section_data
*section_data
;
1891 bfd_size_type size
= bfd_get_section_size (asec
);
1893 const char *sect_name
= bfd_get_section_name (abfd
, asec
);
1895 if ((bfd_get_section_flags (abfd
, asec
) & SEC_LOAD
) == 0)
1901 new_request
= VEC_safe_push (memory_write_request_s
,
1902 args
->requests
, NULL
);
1903 memset (new_request
, 0, sizeof (struct memory_write_request
));
1904 section_data
= xcalloc (1, sizeof (struct load_progress_section_data
));
1905 new_request
->begin
= bfd_section_lma (abfd
, asec
) + args
->load_offset
;
1906 new_request
->end
= new_request
->begin
+ size
; /* FIXME Should size be in instead? */
1907 new_request
->data
= xmalloc (size
);
1908 new_request
->baton
= section_data
;
1910 buffer
= new_request
->data
;
1912 section_data
->cumulative
= args
->progress_data
;
1913 section_data
->section_name
= sect_name
;
1914 section_data
->section_size
= size
;
1915 section_data
->lma
= new_request
->begin
;
1916 section_data
->buffer
= buffer
;
1918 bfd_get_section_contents (abfd
, asec
, buffer
, 0, size
);
1921 /* Clean up an entire memory request vector, including load
1922 data and progress records. */
1925 clear_memory_write_data (void *arg
)
1927 VEC(memory_write_request_s
) **vec_p
= arg
;
1928 VEC(memory_write_request_s
) *vec
= *vec_p
;
1930 struct memory_write_request
*mr
;
1932 for (i
= 0; VEC_iterate (memory_write_request_s
, vec
, i
, mr
); ++i
)
1937 VEC_free (memory_write_request_s
, vec
);
1941 generic_load (char *args
, int from_tty
)
1944 struct timeval start_time
, end_time
;
1946 struct cleanup
*old_cleanups
= make_cleanup (null_cleanup
, 0);
1947 struct load_section_data cbdata
;
1948 struct load_progress_data total_progress
;
1953 memset (&cbdata
, 0, sizeof (cbdata
));
1954 memset (&total_progress
, 0, sizeof (total_progress
));
1955 cbdata
.progress_data
= &total_progress
;
1957 make_cleanup (clear_memory_write_data
, &cbdata
.requests
);
1959 argv
= buildargv (args
);
1964 make_cleanup_freeargv (argv
);
1966 filename
= tilde_expand (argv
[0]);
1967 make_cleanup (xfree
, filename
);
1969 if (argv
[1] != NULL
)
1973 cbdata
.load_offset
= strtoul (argv
[1], &endptr
, 0);
1975 /* If the last word was not a valid number then
1976 treat it as a file name with spaces in. */
1977 if (argv
[1] == endptr
)
1978 error (_("Invalid download offset:%s."), argv
[1]);
1980 if (argv
[2] != NULL
)
1981 error (_("Too many parameters."));
1984 /* Open the file for loading. */
1985 loadfile_bfd
= bfd_openr (filename
, gnutarget
);
1986 if (loadfile_bfd
== NULL
)
1988 perror_with_name (filename
);
1992 /* FIXME: should be checking for errors from bfd_close (for one thing,
1993 on error it does not free all the storage associated with the
1995 make_cleanup_bfd_close (loadfile_bfd
);
1997 if (!bfd_check_format (loadfile_bfd
, bfd_object
))
1999 error (_("\"%s\" is not an object file: %s"), filename
,
2000 bfd_errmsg (bfd_get_error ()));
2003 bfd_map_over_sections (loadfile_bfd
, add_section_size_callback
,
2004 (void *) &total_progress
.total_size
);
2006 bfd_map_over_sections (loadfile_bfd
, load_section_callback
, &cbdata
);
2008 gettimeofday (&start_time
, NULL
);
2010 if (target_write_memory_blocks (cbdata
.requests
, flash_discard
,
2011 load_progress
) != 0)
2012 error (_("Load failed"));
2014 gettimeofday (&end_time
, NULL
);
2016 entry
= bfd_get_start_address (loadfile_bfd
);
2017 ui_out_text (uiout
, "Start address ");
2018 ui_out_field_fmt (uiout
, "address", "0x%s", paddr_nz (entry
));
2019 ui_out_text (uiout
, ", load size ");
2020 ui_out_field_fmt (uiout
, "load-size", "%lu", total_progress
.data_count
);
2021 ui_out_text (uiout
, "\n");
2022 /* We were doing this in remote-mips.c, I suspect it is right
2023 for other targets too. */
2026 /* FIXME: are we supposed to call symbol_file_add or not? According
2027 to a comment from remote-mips.c (where a call to symbol_file_add
2028 was commented out), making the call confuses GDB if more than one
2029 file is loaded in. Some targets do (e.g., remote-vx.c) but
2030 others don't (or didn't - perhaps they have all been deleted). */
2032 print_transfer_performance (gdb_stdout
, total_progress
.data_count
,
2033 total_progress
.write_count
,
2034 &start_time
, &end_time
);
2036 do_cleanups (old_cleanups
);
2039 /* Report how fast the transfer went. */
2041 /* DEPRECATED: cagney/1999-10-18: report_transfer_performance is being
2042 replaced by print_transfer_performance (with a very different
2043 function signature). */
2046 report_transfer_performance (unsigned long data_count
, time_t start_time
,
2049 struct timeval start
, end
;
2051 start
.tv_sec
= start_time
;
2053 end
.tv_sec
= end_time
;
2056 print_transfer_performance (gdb_stdout
, data_count
, 0, &start
, &end
);
2060 print_transfer_performance (struct ui_file
*stream
,
2061 unsigned long data_count
,
2062 unsigned long write_count
,
2063 const struct timeval
*start_time
,
2064 const struct timeval
*end_time
)
2066 ULONGEST time_count
;
2068 /* Compute the elapsed time in milliseconds, as a tradeoff between
2069 accuracy and overflow. */
2070 time_count
= (end_time
->tv_sec
- start_time
->tv_sec
) * 1000;
2071 time_count
+= (end_time
->tv_usec
- start_time
->tv_usec
) / 1000;
2073 ui_out_text (uiout
, "Transfer rate: ");
2076 unsigned long rate
= ((ULONGEST
) data_count
* 1000) / time_count
;
2078 if (ui_out_is_mi_like_p (uiout
))
2080 ui_out_field_fmt (uiout
, "transfer-rate", "%lu", rate
* 8);
2081 ui_out_text (uiout
, " bits/sec");
2083 else if (rate
< 1024)
2085 ui_out_field_fmt (uiout
, "transfer-rate", "%lu", rate
);
2086 ui_out_text (uiout
, " bytes/sec");
2090 ui_out_field_fmt (uiout
, "transfer-rate", "%lu", rate
/ 1024);
2091 ui_out_text (uiout
, " KB/sec");
2096 ui_out_field_fmt (uiout
, "transferred-bits", "%lu", (data_count
* 8));
2097 ui_out_text (uiout
, " bits in <1 sec");
2099 if (write_count
> 0)
2101 ui_out_text (uiout
, ", ");
2102 ui_out_field_fmt (uiout
, "write-rate", "%lu", data_count
/ write_count
);
2103 ui_out_text (uiout
, " bytes/write");
2105 ui_out_text (uiout
, ".\n");
2108 /* This function allows the addition of incrementally linked object files.
2109 It does not modify any state in the target, only in the debugger. */
2110 /* Note: ezannoni 2000-04-13 This function/command used to have a
2111 special case syntax for the rombug target (Rombug is the boot
2112 monitor for Microware's OS-9 / OS-9000, see remote-os9k.c). In the
2113 rombug case, the user doesn't need to supply a text address,
2114 instead a call to target_link() (in target.c) would supply the
2115 value to use. We are now discontinuing this type of ad hoc syntax. */
2118 add_symbol_file_command (char *args
, int from_tty
)
2120 char *filename
= NULL
;
2121 int flags
= OBJF_USERLOADED
;
2123 int expecting_option
= 0;
2124 int section_index
= 0;
2128 int expecting_sec_name
= 0;
2129 int expecting_sec_addr
= 0;
2138 struct section_addr_info
*section_addrs
;
2139 struct sect_opt
*sect_opts
= NULL
;
2140 size_t num_sect_opts
= 0;
2141 struct cleanup
*my_cleanups
= make_cleanup (null_cleanup
, NULL
);
2144 sect_opts
= (struct sect_opt
*) xmalloc (num_sect_opts
2145 * sizeof (struct sect_opt
));
2150 error (_("add-symbol-file takes a file name and an address"));
2152 argv
= buildargv (args
);
2153 make_cleanup_freeargv (argv
);
2158 for (arg
= argv
[0], argcnt
= 0; arg
!= NULL
; arg
= argv
[++argcnt
])
2160 /* Process the argument. */
2163 /* The first argument is the file name. */
2164 filename
= tilde_expand (arg
);
2165 make_cleanup (xfree
, filename
);
2170 /* The second argument is always the text address at which
2171 to load the program. */
2172 sect_opts
[section_index
].name
= ".text";
2173 sect_opts
[section_index
].value
= arg
;
2174 if (++section_index
>= num_sect_opts
)
2177 sect_opts
= ((struct sect_opt
*)
2178 xrealloc (sect_opts
,
2180 * sizeof (struct sect_opt
)));
2185 /* It's an option (starting with '-') or it's an argument
2190 if (strcmp (arg
, "-readnow") == 0)
2191 flags
|= OBJF_READNOW
;
2192 else if (strcmp (arg
, "-s") == 0)
2194 expecting_sec_name
= 1;
2195 expecting_sec_addr
= 1;
2200 if (expecting_sec_name
)
2202 sect_opts
[section_index
].name
= arg
;
2203 expecting_sec_name
= 0;
2206 if (expecting_sec_addr
)
2208 sect_opts
[section_index
].value
= arg
;
2209 expecting_sec_addr
= 0;
2210 if (++section_index
>= num_sect_opts
)
2213 sect_opts
= ((struct sect_opt
*)
2214 xrealloc (sect_opts
,
2216 * sizeof (struct sect_opt
)));
2220 error (_("USAGE: add-symbol-file <filename> <textaddress> [-mapped] [-readnow] [-s <secname> <addr>]*"));
2225 /* This command takes at least two arguments. The first one is a
2226 filename, and the second is the address where this file has been
2227 loaded. Abort now if this address hasn't been provided by the
2229 if (section_index
< 1)
2230 error (_("The address where %s has been loaded is missing"), filename
);
2232 /* Print the prompt for the query below. And save the arguments into
2233 a sect_addr_info structure to be passed around to other
2234 functions. We have to split this up into separate print
2235 statements because hex_string returns a local static
2238 printf_unfiltered (_("add symbol table from file \"%s\" at\n"), filename
);
2239 section_addrs
= alloc_section_addr_info (section_index
);
2240 make_cleanup (xfree
, section_addrs
);
2241 for (i
= 0; i
< section_index
; i
++)
2244 char *val
= sect_opts
[i
].value
;
2245 char *sec
= sect_opts
[i
].name
;
2247 addr
= parse_and_eval_address (val
);
2249 /* Here we store the section offsets in the order they were
2250 entered on the command line. */
2251 section_addrs
->other
[sec_num
].name
= sec
;
2252 section_addrs
->other
[sec_num
].addr
= addr
;
2253 printf_unfiltered ("\t%s_addr = %s\n", sec
, paddress (addr
));
2256 /* The object's sections are initialized when a
2257 call is made to build_objfile_section_table (objfile).
2258 This happens in reread_symbols.
2259 At this point, we don't know what file type this is,
2260 so we can't determine what section names are valid. */
2263 if (from_tty
&& (!query ("%s", "")))
2264 error (_("Not confirmed."));
2266 symbol_file_add (filename
, from_tty
, section_addrs
, 0, flags
);
2268 /* Getting new symbols may change our opinion about what is
2270 reinit_frame_cache ();
2271 do_cleanups (my_cleanups
);
2275 add_shared_symbol_files_command (char *args
, int from_tty
)
2277 #ifdef ADD_SHARED_SYMBOL_FILES
2278 ADD_SHARED_SYMBOL_FILES (args
, from_tty
);
2280 error (_("This command is not available in this configuration of GDB."));
2284 /* Re-read symbols if a symbol-file has changed. */
2286 reread_symbols (void)
2288 struct objfile
*objfile
;
2291 struct stat new_statbuf
;
2294 /* With the addition of shared libraries, this should be modified,
2295 the load time should be saved in the partial symbol tables, since
2296 different tables may come from different source files. FIXME.
2297 This routine should then walk down each partial symbol table
2298 and see if the symbol table that it originates from has been changed */
2300 for (objfile
= object_files
; objfile
; objfile
= objfile
->next
)
2304 #ifdef DEPRECATED_IBM6000_TARGET
2305 /* If this object is from a shared library, then you should
2306 stat on the library name, not member name. */
2308 if (objfile
->obfd
->my_archive
)
2309 res
= stat (objfile
->obfd
->my_archive
->filename
, &new_statbuf
);
2312 res
= stat (objfile
->name
, &new_statbuf
);
2315 /* FIXME, should use print_sys_errmsg but it's not filtered. */
2316 printf_unfiltered (_("`%s' has disappeared; keeping its symbols.\n"),
2320 new_modtime
= new_statbuf
.st_mtime
;
2321 if (new_modtime
!= objfile
->mtime
)
2323 struct cleanup
*old_cleanups
;
2324 struct section_offsets
*offsets
;
2326 char *obfd_filename
;
2328 printf_unfiltered (_("`%s' has changed; re-reading symbols.\n"),
2331 /* There are various functions like symbol_file_add,
2332 symfile_bfd_open, syms_from_objfile, etc., which might
2333 appear to do what we want. But they have various other
2334 effects which we *don't* want. So we just do stuff
2335 ourselves. We don't worry about mapped files (for one thing,
2336 any mapped file will be out of date). */
2338 /* If we get an error, blow away this objfile (not sure if
2339 that is the correct response for things like shared
2341 old_cleanups
= make_cleanup_free_objfile (objfile
);
2342 /* We need to do this whenever any symbols go away. */
2343 make_cleanup (clear_symtab_users_cleanup
, 0 /*ignore*/);
2345 if (exec_bfd
!= NULL
&& strcmp (bfd_get_filename (objfile
->obfd
),
2346 bfd_get_filename (exec_bfd
)) == 0)
2348 /* Reload EXEC_BFD without asking anything. */
2350 exec_file_attach (bfd_get_filename (objfile
->obfd
), 0);
2353 /* Clean up any state BFD has sitting around. We don't need
2354 to close the descriptor but BFD lacks a way of closing the
2355 BFD without closing the descriptor. */
2356 obfd_filename
= bfd_get_filename (objfile
->obfd
);
2357 if (!bfd_close (objfile
->obfd
))
2358 error (_("Can't close BFD for %s: %s"), objfile
->name
,
2359 bfd_errmsg (bfd_get_error ()));
2360 objfile
->obfd
= bfd_openr (obfd_filename
, gnutarget
);
2361 if (objfile
->obfd
== NULL
)
2362 error (_("Can't open %s to read symbols."), objfile
->name
);
2363 /* bfd_openr sets cacheable to true, which is what we want. */
2364 if (!bfd_check_format (objfile
->obfd
, bfd_object
))
2365 error (_("Can't read symbols from %s: %s."), objfile
->name
,
2366 bfd_errmsg (bfd_get_error ()));
2368 /* Save the offsets, we will nuke them with the rest of the
2370 num_offsets
= objfile
->num_sections
;
2371 offsets
= ((struct section_offsets
*)
2372 alloca (SIZEOF_N_SECTION_OFFSETS (num_offsets
)));
2373 memcpy (offsets
, objfile
->section_offsets
,
2374 SIZEOF_N_SECTION_OFFSETS (num_offsets
));
2376 /* Remove any references to this objfile in the global
2378 preserve_values (objfile
);
2380 /* Nuke all the state that we will re-read. Much of the following
2381 code which sets things to NULL really is necessary to tell
2382 other parts of GDB that there is nothing currently there. */
2384 /* FIXME: Do we have to free a whole linked list, or is this
2386 if (objfile
->global_psymbols
.list
)
2387 xfree (objfile
->global_psymbols
.list
);
2388 memset (&objfile
->global_psymbols
, 0,
2389 sizeof (objfile
->global_psymbols
));
2390 if (objfile
->static_psymbols
.list
)
2391 xfree (objfile
->static_psymbols
.list
);
2392 memset (&objfile
->static_psymbols
, 0,
2393 sizeof (objfile
->static_psymbols
));
2395 /* Free the obstacks for non-reusable objfiles */
2396 bcache_xfree (objfile
->psymbol_cache
);
2397 objfile
->psymbol_cache
= bcache_xmalloc ();
2398 bcache_xfree (objfile
->macro_cache
);
2399 objfile
->macro_cache
= bcache_xmalloc ();
2400 if (objfile
->demangled_names_hash
!= NULL
)
2402 htab_delete (objfile
->demangled_names_hash
);
2403 objfile
->demangled_names_hash
= NULL
;
2405 obstack_free (&objfile
->objfile_obstack
, 0);
2406 objfile
->sections
= NULL
;
2407 objfile
->symtabs
= NULL
;
2408 objfile
->psymtabs
= NULL
;
2409 objfile
->free_psymtabs
= NULL
;
2410 objfile
->cp_namespace_symtab
= NULL
;
2411 objfile
->msymbols
= NULL
;
2412 objfile
->deprecated_sym_private
= NULL
;
2413 objfile
->minimal_symbol_count
= 0;
2414 memset (&objfile
->msymbol_hash
, 0,
2415 sizeof (objfile
->msymbol_hash
));
2416 memset (&objfile
->msymbol_demangled_hash
, 0,
2417 sizeof (objfile
->msymbol_demangled_hash
));
2418 clear_objfile_data (objfile
);
2419 if (objfile
->sf
!= NULL
)
2421 (*objfile
->sf
->sym_finish
) (objfile
);
2424 /* We never make this a mapped file. */
2426 objfile
->psymbol_cache
= bcache_xmalloc ();
2427 objfile
->macro_cache
= bcache_xmalloc ();
2428 /* obstack_init also initializes the obstack so it is
2429 empty. We could use obstack_specify_allocation but
2430 gdb_obstack.h specifies the alloc/dealloc
2432 obstack_init (&objfile
->objfile_obstack
);
2433 if (build_objfile_section_table (objfile
))
2435 error (_("Can't find the file sections in `%s': %s"),
2436 objfile
->name
, bfd_errmsg (bfd_get_error ()));
2438 terminate_minimal_symbol_table (objfile
);
2440 /* We use the same section offsets as from last time. I'm not
2441 sure whether that is always correct for shared libraries. */
2442 objfile
->section_offsets
= (struct section_offsets
*)
2443 obstack_alloc (&objfile
->objfile_obstack
,
2444 SIZEOF_N_SECTION_OFFSETS (num_offsets
));
2445 memcpy (objfile
->section_offsets
, offsets
,
2446 SIZEOF_N_SECTION_OFFSETS (num_offsets
));
2447 objfile
->num_sections
= num_offsets
;
2449 /* What the hell is sym_new_init for, anyway? The concept of
2450 distinguishing between the main file and additional files
2451 in this way seems rather dubious. */
2452 if (objfile
== symfile_objfile
)
2454 (*objfile
->sf
->sym_new_init
) (objfile
);
2457 (*objfile
->sf
->sym_init
) (objfile
);
2458 clear_complaints (&symfile_complaints
, 1, 1);
2459 /* The "mainline" parameter is a hideous hack; I think leaving it
2460 zero is OK since dbxread.c also does what it needs to do if
2461 objfile->global_psymbols.size is 0. */
2462 (*objfile
->sf
->sym_read
) (objfile
, 0);
2463 if (!have_partial_symbols () && !have_full_symbols ())
2466 printf_unfiltered (_("(no debugging symbols found)\n"));
2469 objfile
->flags
|= OBJF_SYMS
;
2471 /* We're done reading the symbol file; finish off complaints. */
2472 clear_complaints (&symfile_complaints
, 0, 1);
2474 /* Getting new symbols may change our opinion about what is
2477 reinit_frame_cache ();
2479 /* Discard cleanups as symbol reading was successful. */
2480 discard_cleanups (old_cleanups
);
2482 /* If the mtime has changed between the time we set new_modtime
2483 and now, we *want* this to be out of date, so don't call stat
2485 objfile
->mtime
= new_modtime
;
2487 reread_separate_symbols (objfile
);
2488 init_entry_point_info (objfile
);
2495 clear_symtab_users ();
2496 /* At least one objfile has changed, so we can consider that
2497 the executable we're debugging has changed too. */
2498 observer_notify_executable_changed ();
2504 /* Handle separate debug info for OBJFILE, which has just been
2506 - If we had separate debug info before, but now we don't, get rid
2507 of the separated objfile.
2508 - If we didn't have separated debug info before, but now we do,
2509 read in the new separated debug info file.
2510 - If the debug link points to a different file, toss the old one
2511 and read the new one.
2512 This function does *not* handle the case where objfile is still
2513 using the same separate debug info file, but that file's timestamp
2514 has changed. That case should be handled by the loop in
2515 reread_symbols already. */
2517 reread_separate_symbols (struct objfile
*objfile
)
2520 unsigned long crc32
;
2522 /* Does the updated objfile's debug info live in a
2524 debug_file
= find_separate_debug_file (objfile
);
2526 if (objfile
->separate_debug_objfile
)
2528 /* There are two cases where we need to get rid of
2529 the old separated debug info objfile:
2530 - if the new primary objfile doesn't have
2531 separated debug info, or
2532 - if the new primary objfile has separate debug
2533 info, but it's under a different filename.
2535 If the old and new objfiles both have separate
2536 debug info, under the same filename, then we're
2537 okay --- if the separated file's contents have
2538 changed, we will have caught that when we
2539 visited it in this function's outermost
2542 || strcmp (debug_file
, objfile
->separate_debug_objfile
->name
) != 0)
2543 free_objfile (objfile
->separate_debug_objfile
);
2546 /* If the new objfile has separate debug info, and we
2547 haven't loaded it already, do so now. */
2549 && ! objfile
->separate_debug_objfile
)
2551 /* Use the same section offset table as objfile itself.
2552 Preserve the flags from objfile that make sense. */
2553 objfile
->separate_debug_objfile
2554 = (symbol_file_add_with_addrs_or_offsets
2555 (symfile_bfd_open (debug_file
),
2556 info_verbose
, /* from_tty: Don't override the default. */
2557 0, /* No addr table. */
2558 objfile
->section_offsets
, objfile
->num_sections
,
2559 0, /* Not mainline. See comments about this above. */
2560 objfile
->flags
& (OBJF_REORDERED
| OBJF_SHARED
| OBJF_READNOW
2561 | OBJF_USERLOADED
)));
2562 objfile
->separate_debug_objfile
->separate_debug_objfile_backlink
2580 static filename_language
*filename_language_table
;
2581 static int fl_table_size
, fl_table_next
;
2584 add_filename_language (char *ext
, enum language lang
)
2586 if (fl_table_next
>= fl_table_size
)
2588 fl_table_size
+= 10;
2589 filename_language_table
=
2590 xrealloc (filename_language_table
,
2591 fl_table_size
* sizeof (*filename_language_table
));
2594 filename_language_table
[fl_table_next
].ext
= xstrdup (ext
);
2595 filename_language_table
[fl_table_next
].lang
= lang
;
2599 static char *ext_args
;
2601 show_ext_args (struct ui_file
*file
, int from_tty
,
2602 struct cmd_list_element
*c
, const char *value
)
2604 fprintf_filtered (file
, _("\
2605 Mapping between filename extension and source language is \"%s\".\n"),
2610 set_ext_lang_command (char *args
, int from_tty
, struct cmd_list_element
*e
)
2613 char *cp
= ext_args
;
2616 /* First arg is filename extension, starting with '.' */
2618 error (_("'%s': Filename extension must begin with '.'"), ext_args
);
2620 /* Find end of first arg. */
2621 while (*cp
&& !isspace (*cp
))
2625 error (_("'%s': two arguments required -- filename extension and language"),
2628 /* Null-terminate first arg */
2631 /* Find beginning of second arg, which should be a source language. */
2632 while (*cp
&& isspace (*cp
))
2636 error (_("'%s': two arguments required -- filename extension and language"),
2639 /* Lookup the language from among those we know. */
2640 lang
= language_enum (cp
);
2642 /* Now lookup the filename extension: do we already know it? */
2643 for (i
= 0; i
< fl_table_next
; i
++)
2644 if (0 == strcmp (ext_args
, filename_language_table
[i
].ext
))
2647 if (i
>= fl_table_next
)
2649 /* new file extension */
2650 add_filename_language (ext_args
, lang
);
2654 /* redefining a previously known filename extension */
2657 /* query ("Really make files of type %s '%s'?", */
2658 /* ext_args, language_str (lang)); */
2660 xfree (filename_language_table
[i
].ext
);
2661 filename_language_table
[i
].ext
= xstrdup (ext_args
);
2662 filename_language_table
[i
].lang
= lang
;
2667 info_ext_lang_command (char *args
, int from_tty
)
2671 printf_filtered (_("Filename extensions and the languages they represent:"));
2672 printf_filtered ("\n\n");
2673 for (i
= 0; i
< fl_table_next
; i
++)
2674 printf_filtered ("\t%s\t- %s\n",
2675 filename_language_table
[i
].ext
,
2676 language_str (filename_language_table
[i
].lang
));
2680 init_filename_language_table (void)
2682 if (fl_table_size
== 0) /* protect against repetition */
2686 filename_language_table
=
2687 xmalloc (fl_table_size
* sizeof (*filename_language_table
));
2688 add_filename_language (".c", language_c
);
2689 add_filename_language (".C", language_cplus
);
2690 add_filename_language (".cc", language_cplus
);
2691 add_filename_language (".cp", language_cplus
);
2692 add_filename_language (".cpp", language_cplus
);
2693 add_filename_language (".cxx", language_cplus
);
2694 add_filename_language (".c++", language_cplus
);
2695 add_filename_language (".java", language_java
);
2696 add_filename_language (".class", language_java
);
2697 add_filename_language (".m", language_objc
);
2698 add_filename_language (".f", language_fortran
);
2699 add_filename_language (".F", language_fortran
);
2700 add_filename_language (".s", language_asm
);
2701 add_filename_language (".sx", language_asm
);
2702 add_filename_language (".S", language_asm
);
2703 add_filename_language (".pas", language_pascal
);
2704 add_filename_language (".p", language_pascal
);
2705 add_filename_language (".pp", language_pascal
);
2706 add_filename_language (".adb", language_ada
);
2707 add_filename_language (".ads", language_ada
);
2708 add_filename_language (".a", language_ada
);
2709 add_filename_language (".ada", language_ada
);
2714 deduce_language_from_filename (char *filename
)
2719 if (filename
!= NULL
)
2720 if ((cp
= strrchr (filename
, '.')) != NULL
)
2721 for (i
= 0; i
< fl_table_next
; i
++)
2722 if (strcmp (cp
, filename_language_table
[i
].ext
) == 0)
2723 return filename_language_table
[i
].lang
;
2725 return language_unknown
;
2730 Allocate and partly initialize a new symbol table. Return a pointer
2731 to it. error() if no space.
2733 Caller must set these fields:
2739 possibly free_named_symtabs (symtab->filename);
2743 allocate_symtab (char *filename
, struct objfile
*objfile
)
2745 struct symtab
*symtab
;
2747 symtab
= (struct symtab
*)
2748 obstack_alloc (&objfile
->objfile_obstack
, sizeof (struct symtab
));
2749 memset (symtab
, 0, sizeof (*symtab
));
2750 symtab
->filename
= obsavestring (filename
, strlen (filename
),
2751 &objfile
->objfile_obstack
);
2752 symtab
->fullname
= NULL
;
2753 symtab
->language
= deduce_language_from_filename (filename
);
2754 symtab
->debugformat
= obsavestring ("unknown", 7,
2755 &objfile
->objfile_obstack
);
2757 /* Hook it to the objfile it comes from */
2759 symtab
->objfile
= objfile
;
2760 symtab
->next
= objfile
->symtabs
;
2761 objfile
->symtabs
= symtab
;
2766 struct partial_symtab
*
2767 allocate_psymtab (char *filename
, struct objfile
*objfile
)
2769 struct partial_symtab
*psymtab
;
2771 if (objfile
->free_psymtabs
)
2773 psymtab
= objfile
->free_psymtabs
;
2774 objfile
->free_psymtabs
= psymtab
->next
;
2777 psymtab
= (struct partial_symtab
*)
2778 obstack_alloc (&objfile
->objfile_obstack
,
2779 sizeof (struct partial_symtab
));
2781 memset (psymtab
, 0, sizeof (struct partial_symtab
));
2782 psymtab
->filename
= obsavestring (filename
, strlen (filename
),
2783 &objfile
->objfile_obstack
);
2784 psymtab
->symtab
= NULL
;
2786 /* Prepend it to the psymtab list for the objfile it belongs to.
2787 Psymtabs are searched in most recent inserted -> least recent
2790 psymtab
->objfile
= objfile
;
2791 psymtab
->next
= objfile
->psymtabs
;
2792 objfile
->psymtabs
= psymtab
;
2795 struct partial_symtab
**prev_pst
;
2796 psymtab
->objfile
= objfile
;
2797 psymtab
->next
= NULL
;
2798 prev_pst
= &(objfile
->psymtabs
);
2799 while ((*prev_pst
) != NULL
)
2800 prev_pst
= &((*prev_pst
)->next
);
2801 (*prev_pst
) = psymtab
;
2809 discard_psymtab (struct partial_symtab
*pst
)
2811 struct partial_symtab
**prev_pst
;
2814 Empty psymtabs happen as a result of header files which don't
2815 have any symbols in them. There can be a lot of them. But this
2816 check is wrong, in that a psymtab with N_SLINE entries but
2817 nothing else is not empty, but we don't realize that. Fixing
2818 that without slowing things down might be tricky. */
2820 /* First, snip it out of the psymtab chain */
2822 prev_pst
= &(pst
->objfile
->psymtabs
);
2823 while ((*prev_pst
) != pst
)
2824 prev_pst
= &((*prev_pst
)->next
);
2825 (*prev_pst
) = pst
->next
;
2827 /* Next, put it on a free list for recycling */
2829 pst
->next
= pst
->objfile
->free_psymtabs
;
2830 pst
->objfile
->free_psymtabs
= pst
;
2834 /* Reset all data structures in gdb which may contain references to symbol
2838 clear_symtab_users (void)
2840 /* Someday, we should do better than this, by only blowing away
2841 the things that really need to be blown. */
2843 /* Clear the "current" symtab first, because it is no longer valid.
2844 breakpoint_re_set may try to access the current symtab. */
2845 clear_current_source_symtab_and_line ();
2848 breakpoint_re_set ();
2849 set_default_breakpoint (0, 0, 0, 0);
2850 clear_pc_function_cache ();
2851 observer_notify_new_objfile (NULL
);
2853 /* Clear globals which might have pointed into a removed objfile.
2854 FIXME: It's not clear which of these are supposed to persist
2855 between expressions and which ought to be reset each time. */
2856 expression_context_block
= NULL
;
2857 innermost_block
= NULL
;
2859 /* Varobj may refer to old symbols, perform a cleanup. */
2860 varobj_invalidate ();
2865 clear_symtab_users_cleanup (void *ignore
)
2867 clear_symtab_users ();
2870 /* clear_symtab_users_once:
2872 This function is run after symbol reading, or from a cleanup.
2873 If an old symbol table was obsoleted, the old symbol table
2874 has been blown away, but the other GDB data structures that may
2875 reference it have not yet been cleared or re-directed. (The old
2876 symtab was zapped, and the cleanup queued, in free_named_symtab()
2879 This function can be queued N times as a cleanup, or called
2880 directly; it will do all the work the first time, and then will be a
2881 no-op until the next time it is queued. This works by bumping a
2882 counter at queueing time. Much later when the cleanup is run, or at
2883 the end of symbol processing (in case the cleanup is discarded), if
2884 the queued count is greater than the "done-count", we do the work
2885 and set the done-count to the queued count. If the queued count is
2886 less than or equal to the done-count, we just ignore the call. This
2887 is needed because reading a single .o file will often replace many
2888 symtabs (one per .h file, for example), and we don't want to reset
2889 the breakpoints N times in the user's face.
2891 The reason we both queue a cleanup, and call it directly after symbol
2892 reading, is because the cleanup protects us in case of errors, but is
2893 discarded if symbol reading is successful. */
2896 /* FIXME: As free_named_symtabs is currently a big noop this function
2897 is no longer needed. */
2898 static void clear_symtab_users_once (void);
2900 static int clear_symtab_users_queued
;
2901 static int clear_symtab_users_done
;
2904 clear_symtab_users_once (void)
2906 /* Enforce once-per-`do_cleanups'-semantics */
2907 if (clear_symtab_users_queued
<= clear_symtab_users_done
)
2909 clear_symtab_users_done
= clear_symtab_users_queued
;
2911 clear_symtab_users ();
2915 /* Delete the specified psymtab, and any others that reference it. */
2918 cashier_psymtab (struct partial_symtab
*pst
)
2920 struct partial_symtab
*ps
, *pprev
= NULL
;
2923 /* Find its previous psymtab in the chain */
2924 for (ps
= pst
->objfile
->psymtabs
; ps
; ps
= ps
->next
)
2933 /* Unhook it from the chain. */
2934 if (ps
== pst
->objfile
->psymtabs
)
2935 pst
->objfile
->psymtabs
= ps
->next
;
2937 pprev
->next
= ps
->next
;
2939 /* FIXME, we can't conveniently deallocate the entries in the
2940 partial_symbol lists (global_psymbols/static_psymbols) that
2941 this psymtab points to. These just take up space until all
2942 the psymtabs are reclaimed. Ditto the dependencies list and
2943 filename, which are all in the objfile_obstack. */
2945 /* We need to cashier any psymtab that has this one as a dependency... */
2947 for (ps
= pst
->objfile
->psymtabs
; ps
; ps
= ps
->next
)
2949 for (i
= 0; i
< ps
->number_of_dependencies
; i
++)
2951 if (ps
->dependencies
[i
] == pst
)
2953 cashier_psymtab (ps
);
2954 goto again
; /* Must restart, chain has been munged. */
2961 /* If a symtab or psymtab for filename NAME is found, free it along
2962 with any dependent breakpoints, displays, etc.
2963 Used when loading new versions of object modules with the "add-file"
2964 command. This is only called on the top-level symtab or psymtab's name;
2965 it is not called for subsidiary files such as .h files.
2967 Return value is 1 if we blew away the environment, 0 if not.
2968 FIXME. The return value appears to never be used.
2970 FIXME. I think this is not the best way to do this. We should
2971 work on being gentler to the environment while still cleaning up
2972 all stray pointers into the freed symtab. */
2975 free_named_symtabs (char *name
)
2978 /* FIXME: With the new method of each objfile having it's own
2979 psymtab list, this function needs serious rethinking. In particular,
2980 why was it ever necessary to toss psymtabs with specific compilation
2981 unit filenames, as opposed to all psymtabs from a particular symbol
2983 Well, the answer is that some systems permit reloading of particular
2984 compilation units. We want to blow away any old info about these
2985 compilation units, regardless of which objfiles they arrived in. --gnu. */
2988 struct symtab
*prev
;
2989 struct partial_symtab
*ps
;
2990 struct blockvector
*bv
;
2993 /* We only wack things if the symbol-reload switch is set. */
2994 if (!symbol_reloading
)
2997 /* Some symbol formats have trouble providing file names... */
2998 if (name
== 0 || *name
== '\0')
3001 /* Look for a psymtab with the specified name. */
3004 for (ps
= partial_symtab_list
; ps
; ps
= ps
->next
)
3006 if (strcmp (name
, ps
->filename
) == 0)
3008 cashier_psymtab (ps
); /* Blow it away...and its little dog, too. */
3009 goto again2
; /* Must restart, chain has been munged */
3013 /* Look for a symtab with the specified name. */
3015 for (s
= symtab_list
; s
; s
= s
->next
)
3017 if (strcmp (name
, s
->filename
) == 0)
3024 if (s
== symtab_list
)
3025 symtab_list
= s
->next
;
3027 prev
->next
= s
->next
;
3029 /* For now, queue a delete for all breakpoints, displays, etc., whether
3030 or not they depend on the symtab being freed. This should be
3031 changed so that only those data structures affected are deleted. */
3033 /* But don't delete anything if the symtab is empty.
3034 This test is necessary due to a bug in "dbxread.c" that
3035 causes empty symtabs to be created for N_SO symbols that
3036 contain the pathname of the object file. (This problem
3037 has been fixed in GDB 3.9x). */
3039 bv
= BLOCKVECTOR (s
);
3040 if (BLOCKVECTOR_NBLOCKS (bv
) > 2
3041 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv
, GLOBAL_BLOCK
))
3042 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv
, STATIC_BLOCK
)))
3044 complaint (&symfile_complaints
, _("Replacing old symbols for `%s'"),
3046 clear_symtab_users_queued
++;
3047 make_cleanup (clear_symtab_users_once
, 0);
3051 complaint (&symfile_complaints
, _("Empty symbol table found for `%s'"),
3058 /* It is still possible that some breakpoints will be affected
3059 even though no symtab was found, since the file might have
3060 been compiled without debugging, and hence not be associated
3061 with a symtab. In order to handle this correctly, we would need
3062 to keep a list of text address ranges for undebuggable files.
3063 For now, we do nothing, since this is a fairly obscure case. */
3067 /* FIXME, what about the minimal symbol table? */
3074 /* Allocate and partially fill a partial symtab. It will be
3075 completely filled at the end of the symbol list.
3077 FILENAME is the name of the symbol-file we are reading from. */
3079 struct partial_symtab
*
3080 start_psymtab_common (struct objfile
*objfile
,
3081 struct section_offsets
*section_offsets
, char *filename
,
3082 CORE_ADDR textlow
, struct partial_symbol
**global_syms
,
3083 struct partial_symbol
**static_syms
)
3085 struct partial_symtab
*psymtab
;
3087 psymtab
= allocate_psymtab (filename
, objfile
);
3088 psymtab
->section_offsets
= section_offsets
;
3089 psymtab
->textlow
= textlow
;
3090 psymtab
->texthigh
= psymtab
->textlow
; /* default */
3091 psymtab
->globals_offset
= global_syms
- objfile
->global_psymbols
.list
;
3092 psymtab
->statics_offset
= static_syms
- objfile
->static_psymbols
.list
;
3096 /* Helper function, initialises partial symbol structure and stashes
3097 it into objfile's bcache. Note that our caching mechanism will
3098 use all fields of struct partial_symbol to determine hash value of the
3099 structure. In other words, having two symbols with the same name but
3100 different domain (or address) is possible and correct. */
3102 static struct partial_symbol
*
3103 add_psymbol_to_bcache (char *name
, int namelength
, domain_enum domain
,
3104 enum address_class
class,
3105 long val
, /* Value as a long */
3106 CORE_ADDR coreaddr
, /* Value as a CORE_ADDR */
3107 enum language language
, struct objfile
*objfile
,
3111 /* psymbol is static so that there will be no uninitialized gaps in the
3112 structure which might contain random data, causing cache misses in
3114 static struct partial_symbol psymbol
;
3116 if (name
[namelength
] != '\0')
3118 buf
= alloca (namelength
+ 1);
3119 /* Create local copy of the partial symbol */
3120 memcpy (buf
, name
, namelength
);
3121 buf
[namelength
] = '\0';
3123 /* val and coreaddr are mutually exclusive, one of them *will* be zero */
3126 SYMBOL_VALUE (&psymbol
) = val
;
3130 SYMBOL_VALUE_ADDRESS (&psymbol
) = coreaddr
;
3132 SYMBOL_SECTION (&psymbol
) = 0;
3133 SYMBOL_LANGUAGE (&psymbol
) = language
;
3134 PSYMBOL_DOMAIN (&psymbol
) = domain
;
3135 PSYMBOL_CLASS (&psymbol
) = class;
3137 SYMBOL_SET_NAMES (&psymbol
, buf
, namelength
, objfile
);
3139 /* Stash the partial symbol away in the cache */
3140 return deprecated_bcache_added (&psymbol
, sizeof (struct partial_symbol
),
3141 objfile
->psymbol_cache
, added
);
3144 /* Helper function, adds partial symbol to the given partial symbol
3148 append_psymbol_to_list (struct psymbol_allocation_list
*list
,
3149 struct partial_symbol
*psym
,
3150 struct objfile
*objfile
)
3152 if (list
->next
>= list
->list
+ list
->size
)
3153 extend_psymbol_list (list
, objfile
);
3154 *list
->next
++ = psym
;
3155 OBJSTAT (objfile
, n_psyms
++);
3158 /* Add a symbol with a long value to a psymtab.
3159 Since one arg is a struct, we pass in a ptr and deref it (sigh).
3160 Return the partial symbol that has been added. */
3162 /* NOTE: carlton/2003-09-11: The reason why we return the partial
3163 symbol is so that callers can get access to the symbol's demangled
3164 name, which they don't have any cheap way to determine otherwise.
3165 (Currenly, dwarf2read.c is the only file who uses that information,
3166 though it's possible that other readers might in the future.)
3167 Elena wasn't thrilled about that, and I don't blame her, but we
3168 couldn't come up with a better way to get that information. If
3169 it's needed in other situations, we could consider breaking up
3170 SYMBOL_SET_NAMES to provide access to the demangled name lookup
3173 const struct partial_symbol
*
3174 add_psymbol_to_list (char *name
, int namelength
, domain_enum domain
,
3175 enum address_class
class,
3176 struct psymbol_allocation_list
*list
,
3177 long val
, /* Value as a long */
3178 CORE_ADDR coreaddr
, /* Value as a CORE_ADDR */
3179 enum language language
, struct objfile
*objfile
)
3181 struct partial_symbol
*psym
;
3185 /* Stash the partial symbol away in the cache */
3186 psym
= add_psymbol_to_bcache (name
, namelength
, domain
, class,
3187 val
, coreaddr
, language
, objfile
, &added
);
3189 /* Do not duplicate global partial symbols. */
3190 if (list
== &objfile
->global_psymbols
3194 /* Save pointer to partial symbol in psymtab, growing symtab if needed. */
3195 append_psymbol_to_list (list
, psym
, objfile
);
3199 /* Initialize storage for partial symbols. */
3202 init_psymbol_list (struct objfile
*objfile
, int total_symbols
)
3204 /* Free any previously allocated psymbol lists. */
3206 if (objfile
->global_psymbols
.list
)
3208 xfree (objfile
->global_psymbols
.list
);
3210 if (objfile
->static_psymbols
.list
)
3212 xfree (objfile
->static_psymbols
.list
);
3215 /* Current best guess is that approximately a twentieth
3216 of the total symbols (in a debugging file) are global or static
3219 objfile
->global_psymbols
.size
= total_symbols
/ 10;
3220 objfile
->static_psymbols
.size
= total_symbols
/ 10;
3222 if (objfile
->global_psymbols
.size
> 0)
3224 objfile
->global_psymbols
.next
=
3225 objfile
->global_psymbols
.list
= (struct partial_symbol
**)
3226 xmalloc ((objfile
->global_psymbols
.size
3227 * sizeof (struct partial_symbol
*)));
3229 if (objfile
->static_psymbols
.size
> 0)
3231 objfile
->static_psymbols
.next
=
3232 objfile
->static_psymbols
.list
= (struct partial_symbol
**)
3233 xmalloc ((objfile
->static_psymbols
.size
3234 * sizeof (struct partial_symbol
*)));
3239 The following code implements an abstraction for debugging overlay sections.
3241 The target model is as follows:
3242 1) The gnu linker will permit multiple sections to be mapped into the
3243 same VMA, each with its own unique LMA (or load address).
3244 2) It is assumed that some runtime mechanism exists for mapping the
3245 sections, one by one, from the load address into the VMA address.
3246 3) This code provides a mechanism for gdb to keep track of which
3247 sections should be considered to be mapped from the VMA to the LMA.
3248 This information is used for symbol lookup, and memory read/write.
3249 For instance, if a section has been mapped then its contents
3250 should be read from the VMA, otherwise from the LMA.
3252 Two levels of debugger support for overlays are available. One is
3253 "manual", in which the debugger relies on the user to tell it which
3254 overlays are currently mapped. This level of support is
3255 implemented entirely in the core debugger, and the information about
3256 whether a section is mapped is kept in the objfile->obj_section table.
3258 The second level of support is "automatic", and is only available if
3259 the target-specific code provides functionality to read the target's
3260 overlay mapping table, and translate its contents for the debugger
3261 (by updating the mapped state information in the obj_section tables).
3263 The interface is as follows:
3265 overlay map <name> -- tell gdb to consider this section mapped
3266 overlay unmap <name> -- tell gdb to consider this section unmapped
3267 overlay list -- list the sections that GDB thinks are mapped
3268 overlay read-target -- get the target's state of what's mapped
3269 overlay off/manual/auto -- set overlay debugging state
3270 Functional interface:
3271 find_pc_mapped_section(pc): if the pc is in the range of a mapped
3272 section, return that section.
3273 find_pc_overlay(pc): find any overlay section that contains
3274 the pc, either in its VMA or its LMA
3275 overlay_is_mapped(sect): true if overlay is marked as mapped
3276 section_is_overlay(sect): true if section's VMA != LMA
3277 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA
3278 pc_in_unmapped_range(...): true if pc belongs to section's LMA
3279 sections_overlap(sec1, sec2): true if mapped sec1 and sec2 ranges overlap
3280 overlay_mapped_address(...): map an address from section's LMA to VMA
3281 overlay_unmapped_address(...): map an address from section's VMA to LMA
3282 symbol_overlayed_address(...): Return a "current" address for symbol:
3283 either in VMA or LMA depending on whether
3284 the symbol's section is currently mapped
3287 /* Overlay debugging state: */
3289 enum overlay_debugging_state overlay_debugging
= ovly_off
;
3290 int overlay_cache_invalid
= 0; /* True if need to refresh mapped state */
3292 /* Function: section_is_overlay (SECTION)
3293 Returns true if SECTION has VMA not equal to LMA, ie.
3294 SECTION is loaded at an address different from where it will "run". */
3297 section_is_overlay (asection
*section
)
3299 /* FIXME: need bfd *, so we can use bfd_section_lma methods. */
3301 if (overlay_debugging
)
3302 if (section
&& section
->lma
!= 0 &&
3303 section
->vma
!= section
->lma
)
3309 /* Function: overlay_invalidate_all (void)
3310 Invalidate the mapped state of all overlay sections (mark it as stale). */
3313 overlay_invalidate_all (void)
3315 struct objfile
*objfile
;
3316 struct obj_section
*sect
;
3318 ALL_OBJSECTIONS (objfile
, sect
)
3319 if (section_is_overlay (sect
->the_bfd_section
))
3320 sect
->ovly_mapped
= -1;
3323 /* Function: overlay_is_mapped (SECTION)
3324 Returns true if section is an overlay, and is currently mapped.
3325 Private: public access is thru function section_is_mapped.
3327 Access to the ovly_mapped flag is restricted to this function, so
3328 that we can do automatic update. If the global flag
3329 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
3330 overlay_invalidate_all. If the mapped state of the particular
3331 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */
3334 overlay_is_mapped (struct obj_section
*osect
)
3336 if (osect
== 0 || !section_is_overlay (osect
->the_bfd_section
))
3339 switch (overlay_debugging
)
3343 return 0; /* overlay debugging off */
3344 case ovly_auto
: /* overlay debugging automatic */
3345 /* Unles there is a gdbarch_overlay_update function,
3346 there's really nothing useful to do here (can't really go auto) */
3347 if (gdbarch_overlay_update_p (current_gdbarch
))
3349 if (overlay_cache_invalid
)
3351 overlay_invalidate_all ();
3352 overlay_cache_invalid
= 0;
3354 if (osect
->ovly_mapped
== -1)
3355 gdbarch_overlay_update (current_gdbarch
, osect
);
3357 /* fall thru to manual case */
3358 case ovly_on
: /* overlay debugging manual */
3359 return osect
->ovly_mapped
== 1;
3363 /* Function: section_is_mapped
3364 Returns true if section is an overlay, and is currently mapped. */
3367 section_is_mapped (asection
*section
)
3369 struct objfile
*objfile
;
3370 struct obj_section
*osect
;
3372 if (overlay_debugging
)
3373 if (section
&& section_is_overlay (section
))
3374 ALL_OBJSECTIONS (objfile
, osect
)
3375 if (osect
->the_bfd_section
== section
)
3376 return overlay_is_mapped (osect
);
3381 /* Function: pc_in_unmapped_range
3382 If PC falls into the lma range of SECTION, return true, else false. */
3385 pc_in_unmapped_range (CORE_ADDR pc
, asection
*section
)
3387 /* FIXME: need bfd *, so we can use bfd_section_lma methods. */
3391 if (overlay_debugging
)
3392 if (section
&& section_is_overlay (section
))
3394 size
= bfd_get_section_size (section
);
3395 if (section
->lma
<= pc
&& pc
< section
->lma
+ size
)
3401 /* Function: pc_in_mapped_range
3402 If PC falls into the vma range of SECTION, return true, else false. */
3405 pc_in_mapped_range (CORE_ADDR pc
, asection
*section
)
3407 /* FIXME: need bfd *, so we can use bfd_section_vma methods. */
3411 if (overlay_debugging
)
3412 if (section
&& section_is_overlay (section
))
3414 size
= bfd_get_section_size (section
);
3415 if (section
->vma
<= pc
&& pc
< section
->vma
+ size
)
3422 /* Return true if the mapped ranges of sections A and B overlap, false
3425 sections_overlap (asection
*a
, asection
*b
)
3427 /* FIXME: need bfd *, so we can use bfd_section_vma methods. */
3429 CORE_ADDR a_start
= a
->vma
;
3430 CORE_ADDR a_end
= a
->vma
+ bfd_get_section_size (a
);
3431 CORE_ADDR b_start
= b
->vma
;
3432 CORE_ADDR b_end
= b
->vma
+ bfd_get_section_size (b
);
3434 return (a_start
< b_end
&& b_start
< a_end
);
3437 /* Function: overlay_unmapped_address (PC, SECTION)
3438 Returns the address corresponding to PC in the unmapped (load) range.
3439 May be the same as PC. */
3442 overlay_unmapped_address (CORE_ADDR pc
, asection
*section
)
3444 /* FIXME: need bfd *, so we can use bfd_section_lma methods. */
3446 if (overlay_debugging
)
3447 if (section
&& section_is_overlay (section
) &&
3448 pc_in_mapped_range (pc
, section
))
3449 return pc
+ section
->lma
- section
->vma
;
3454 /* Function: overlay_mapped_address (PC, SECTION)
3455 Returns the address corresponding to PC in the mapped (runtime) range.
3456 May be the same as PC. */
3459 overlay_mapped_address (CORE_ADDR pc
, asection
*section
)
3461 /* FIXME: need bfd *, so we can use bfd_section_vma methods. */
3463 if (overlay_debugging
)
3464 if (section
&& section_is_overlay (section
) &&
3465 pc_in_unmapped_range (pc
, section
))
3466 return pc
+ section
->vma
- section
->lma
;
3472 /* Function: symbol_overlayed_address
3473 Return one of two addresses (relative to the VMA or to the LMA),
3474 depending on whether the section is mapped or not. */
3477 symbol_overlayed_address (CORE_ADDR address
, asection
*section
)
3479 if (overlay_debugging
)
3481 /* If the symbol has no section, just return its regular address. */
3484 /* If the symbol's section is not an overlay, just return its address */
3485 if (!section_is_overlay (section
))
3487 /* If the symbol's section is mapped, just return its address */
3488 if (section_is_mapped (section
))
3491 * HOWEVER: if the symbol is in an overlay section which is NOT mapped,
3492 * then return its LOADED address rather than its vma address!!
3494 return overlay_unmapped_address (address
, section
);
3499 /* Function: find_pc_overlay (PC)
3500 Return the best-match overlay section for PC:
3501 If PC matches a mapped overlay section's VMA, return that section.
3502 Else if PC matches an unmapped section's VMA, return that section.
3503 Else if PC matches an unmapped section's LMA, return that section. */
3506 find_pc_overlay (CORE_ADDR pc
)
3508 struct objfile
*objfile
;
3509 struct obj_section
*osect
, *best_match
= NULL
;
3511 if (overlay_debugging
)
3512 ALL_OBJSECTIONS (objfile
, osect
)
3513 if (section_is_overlay (osect
->the_bfd_section
))
3515 if (pc_in_mapped_range (pc
, osect
->the_bfd_section
))
3517 if (overlay_is_mapped (osect
))
3518 return osect
->the_bfd_section
;
3522 else if (pc_in_unmapped_range (pc
, osect
->the_bfd_section
))
3525 return best_match
? best_match
->the_bfd_section
: NULL
;
3528 /* Function: find_pc_mapped_section (PC)
3529 If PC falls into the VMA address range of an overlay section that is
3530 currently marked as MAPPED, return that section. Else return NULL. */
3533 find_pc_mapped_section (CORE_ADDR pc
)
3535 struct objfile
*objfile
;
3536 struct obj_section
*osect
;
3538 if (overlay_debugging
)
3539 ALL_OBJSECTIONS (objfile
, osect
)
3540 if (pc_in_mapped_range (pc
, osect
->the_bfd_section
) &&
3541 overlay_is_mapped (osect
))
3542 return osect
->the_bfd_section
;
3547 /* Function: list_overlays_command
3548 Print a list of mapped sections and their PC ranges */
3551 list_overlays_command (char *args
, int from_tty
)
3554 struct objfile
*objfile
;
3555 struct obj_section
*osect
;
3557 if (overlay_debugging
)
3558 ALL_OBJSECTIONS (objfile
, osect
)
3559 if (overlay_is_mapped (osect
))
3565 vma
= bfd_section_vma (objfile
->obfd
, osect
->the_bfd_section
);
3566 lma
= bfd_section_lma (objfile
->obfd
, osect
->the_bfd_section
);
3567 size
= bfd_get_section_size (osect
->the_bfd_section
);
3568 name
= bfd_section_name (objfile
->obfd
, osect
->the_bfd_section
);
3570 printf_filtered ("Section %s, loaded at ", name
);
3571 fputs_filtered (paddress (lma
), gdb_stdout
);
3572 puts_filtered (" - ");
3573 fputs_filtered (paddress (lma
+ size
), gdb_stdout
);
3574 printf_filtered (", mapped at ");
3575 fputs_filtered (paddress (vma
), gdb_stdout
);
3576 puts_filtered (" - ");
3577 fputs_filtered (paddress (vma
+ size
), gdb_stdout
);
3578 puts_filtered ("\n");
3583 printf_filtered (_("No sections are mapped.\n"));
3586 /* Function: map_overlay_command
3587 Mark the named section as mapped (ie. residing at its VMA address). */
3590 map_overlay_command (char *args
, int from_tty
)
3592 struct objfile
*objfile
, *objfile2
;
3593 struct obj_section
*sec
, *sec2
;
3596 if (!overlay_debugging
)
3598 Overlay debugging not enabled. Use either the 'overlay auto' or\n\
3599 the 'overlay manual' command."));
3601 if (args
== 0 || *args
== 0)
3602 error (_("Argument required: name of an overlay section"));
3604 /* First, find a section matching the user supplied argument */
3605 ALL_OBJSECTIONS (objfile
, sec
)
3606 if (!strcmp (bfd_section_name (objfile
->obfd
, sec
->the_bfd_section
), args
))
3608 /* Now, check to see if the section is an overlay. */
3609 bfdsec
= sec
->the_bfd_section
;
3610 if (!section_is_overlay (bfdsec
))
3611 continue; /* not an overlay section */
3613 /* Mark the overlay as "mapped" */
3614 sec
->ovly_mapped
= 1;
3616 /* Next, make a pass and unmap any sections that are
3617 overlapped by this new section: */
3618 ALL_OBJSECTIONS (objfile2
, sec2
)
3619 if (sec2
->ovly_mapped
3621 && sec
->the_bfd_section
!= sec2
->the_bfd_section
3622 && sections_overlap (sec
->the_bfd_section
,
3623 sec2
->the_bfd_section
))
3626 printf_unfiltered (_("Note: section %s unmapped by overlap\n"),
3627 bfd_section_name (objfile
->obfd
,
3628 sec2
->the_bfd_section
));
3629 sec2
->ovly_mapped
= 0; /* sec2 overlaps sec: unmap sec2 */
3633 error (_("No overlay section called %s"), args
);
3636 /* Function: unmap_overlay_command
3637 Mark the overlay section as unmapped
3638 (ie. resident in its LMA address range, rather than the VMA range). */
3641 unmap_overlay_command (char *args
, int from_tty
)
3643 struct objfile
*objfile
;
3644 struct obj_section
*sec
;
3646 if (!overlay_debugging
)
3648 Overlay debugging not enabled. Use either the 'overlay auto' or\n\
3649 the 'overlay manual' command."));
3651 if (args
== 0 || *args
== 0)
3652 error (_("Argument required: name of an overlay section"));
3654 /* First, find a section matching the user supplied argument */
3655 ALL_OBJSECTIONS (objfile
, sec
)
3656 if (!strcmp (bfd_section_name (objfile
->obfd
, sec
->the_bfd_section
), args
))
3658 if (!sec
->ovly_mapped
)
3659 error (_("Section %s is not mapped"), args
);
3660 sec
->ovly_mapped
= 0;
3663 error (_("No overlay section called %s"), args
);
3666 /* Function: overlay_auto_command
3667 A utility command to turn on overlay debugging.
3668 Possibly this should be done via a set/show command. */
3671 overlay_auto_command (char *args
, int from_tty
)
3673 overlay_debugging
= ovly_auto
;
3674 enable_overlay_breakpoints ();
3676 printf_unfiltered (_("Automatic overlay debugging enabled."));
3679 /* Function: overlay_manual_command
3680 A utility command to turn on overlay debugging.
3681 Possibly this should be done via a set/show command. */
3684 overlay_manual_command (char *args
, int from_tty
)
3686 overlay_debugging
= ovly_on
;
3687 disable_overlay_breakpoints ();
3689 printf_unfiltered (_("Overlay debugging enabled."));
3692 /* Function: overlay_off_command
3693 A utility command to turn on overlay debugging.
3694 Possibly this should be done via a set/show command. */
3697 overlay_off_command (char *args
, int from_tty
)
3699 overlay_debugging
= ovly_off
;
3700 disable_overlay_breakpoints ();
3702 printf_unfiltered (_("Overlay debugging disabled."));
3706 overlay_load_command (char *args
, int from_tty
)
3708 if (gdbarch_overlay_update_p (current_gdbarch
))
3709 gdbarch_overlay_update (current_gdbarch
, NULL
);
3711 error (_("This target does not know how to read its overlay state."));
3714 /* Function: overlay_command
3715 A place-holder for a mis-typed command */
3717 /* Command list chain containing all defined "overlay" subcommands. */
3718 struct cmd_list_element
*overlaylist
;
3721 overlay_command (char *args
, int from_tty
)
3724 ("\"overlay\" must be followed by the name of an overlay command.\n");
3725 help_list (overlaylist
, "overlay ", -1, gdb_stdout
);
3729 /* Target Overlays for the "Simplest" overlay manager:
3731 This is GDB's default target overlay layer. It works with the
3732 minimal overlay manager supplied as an example by Cygnus. The
3733 entry point is via a function pointer "gdbarch_overlay_update",
3734 so targets that use a different runtime overlay manager can
3735 substitute their own overlay_update function and take over the
3738 The overlay_update function pokes around in the target's data structures
3739 to see what overlays are mapped, and updates GDB's overlay mapping with
3742 In this simple implementation, the target data structures are as follows:
3743 unsigned _novlys; /# number of overlay sections #/
3744 unsigned _ovly_table[_novlys][4] = {
3745 {VMA, SIZE, LMA, MAPPED}, /# one entry per overlay section #/
3746 {..., ..., ..., ...},
3748 unsigned _novly_regions; /# number of overlay regions #/
3749 unsigned _ovly_region_table[_novly_regions][3] = {
3750 {VMA, SIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/
3753 These functions will attempt to update GDB's mappedness state in the
3754 symbol section table, based on the target's mappedness state.
3756 To do this, we keep a cached copy of the target's _ovly_table, and
3757 attempt to detect when the cached copy is invalidated. The main
3758 entry point is "simple_overlay_update(SECT), which looks up SECT in
3759 the cached table and re-reads only the entry for that section from
3760 the target (whenever possible).
3763 /* Cached, dynamically allocated copies of the target data structures: */
3764 static unsigned (*cache_ovly_table
)[4] = 0;
3766 static unsigned (*cache_ovly_region_table
)[3] = 0;
3768 static unsigned cache_novlys
= 0;
3770 static unsigned cache_novly_regions
= 0;
3772 static CORE_ADDR cache_ovly_table_base
= 0;
3774 static CORE_ADDR cache_ovly_region_table_base
= 0;
3778 VMA
, SIZE
, LMA
, MAPPED
3780 #define TARGET_LONG_BYTES (gdbarch_long_bit (current_gdbarch) \
3783 /* Throw away the cached copy of _ovly_table */
3785 simple_free_overlay_table (void)
3787 if (cache_ovly_table
)
3788 xfree (cache_ovly_table
);
3790 cache_ovly_table
= NULL
;
3791 cache_ovly_table_base
= 0;
3795 /* Throw away the cached copy of _ovly_region_table */
3797 simple_free_overlay_region_table (void)
3799 if (cache_ovly_region_table
)
3800 xfree (cache_ovly_region_table
);
3801 cache_novly_regions
= 0;
3802 cache_ovly_region_table
= NULL
;
3803 cache_ovly_region_table_base
= 0;
3807 /* Read an array of ints from the target into a local buffer.
3808 Convert to host order. int LEN is number of ints */
3810 read_target_long_array (CORE_ADDR memaddr
, unsigned int *myaddr
, int len
)
3812 /* FIXME (alloca): Not safe if array is very large. */
3813 gdb_byte
*buf
= alloca (len
* TARGET_LONG_BYTES
);
3816 read_memory (memaddr
, buf
, len
* TARGET_LONG_BYTES
);
3817 for (i
= 0; i
< len
; i
++)
3818 myaddr
[i
] = extract_unsigned_integer (TARGET_LONG_BYTES
* i
+ buf
,
3822 /* Find and grab a copy of the target _ovly_table
3823 (and _novlys, which is needed for the table's size) */
3825 simple_read_overlay_table (void)
3827 struct minimal_symbol
*novlys_msym
, *ovly_table_msym
;
3829 simple_free_overlay_table ();
3830 novlys_msym
= lookup_minimal_symbol ("_novlys", NULL
, NULL
);
3833 error (_("Error reading inferior's overlay table: "
3834 "couldn't find `_novlys' variable\n"
3835 "in inferior. Use `overlay manual' mode."));
3839 ovly_table_msym
= lookup_minimal_symbol ("_ovly_table", NULL
, NULL
);
3840 if (! ovly_table_msym
)
3842 error (_("Error reading inferior's overlay table: couldn't find "
3843 "`_ovly_table' array\n"
3844 "in inferior. Use `overlay manual' mode."));
3848 cache_novlys
= read_memory_integer (SYMBOL_VALUE_ADDRESS (novlys_msym
), 4);
3850 = (void *) xmalloc (cache_novlys
* sizeof (*cache_ovly_table
));
3851 cache_ovly_table_base
= SYMBOL_VALUE_ADDRESS (ovly_table_msym
);
3852 read_target_long_array (cache_ovly_table_base
,
3853 (unsigned int *) cache_ovly_table
,
3856 return 1; /* SUCCESS */
3860 /* Find and grab a copy of the target _ovly_region_table
3861 (and _novly_regions, which is needed for the table's size) */
3863 simple_read_overlay_region_table (void)
3865 struct minimal_symbol
*msym
;
3867 simple_free_overlay_region_table ();
3868 msym
= lookup_minimal_symbol ("_novly_regions", NULL
, NULL
);
3870 cache_novly_regions
= read_memory_integer (SYMBOL_VALUE_ADDRESS (msym
), 4);
3872 return 0; /* failure */
3873 cache_ovly_region_table
= (void *) xmalloc (cache_novly_regions
* 12);
3874 if (cache_ovly_region_table
!= NULL
)
3876 msym
= lookup_minimal_symbol ("_ovly_region_table", NULL
, NULL
);
3879 cache_ovly_region_table_base
= SYMBOL_VALUE_ADDRESS (msym
);
3880 read_target_long_array (cache_ovly_region_table_base
,
3881 (unsigned int *) cache_ovly_region_table
,
3882 cache_novly_regions
* 3);
3885 return 0; /* failure */
3888 return 0; /* failure */
3889 return 1; /* SUCCESS */
3893 /* Function: simple_overlay_update_1
3894 A helper function for simple_overlay_update. Assuming a cached copy
3895 of _ovly_table exists, look through it to find an entry whose vma,
3896 lma and size match those of OSECT. Re-read the entry and make sure
3897 it still matches OSECT (else the table may no longer be valid).
3898 Set OSECT's mapped state to match the entry. Return: 1 for
3899 success, 0 for failure. */
3902 simple_overlay_update_1 (struct obj_section
*osect
)
3905 bfd
*obfd
= osect
->objfile
->obfd
;
3906 asection
*bsect
= osect
->the_bfd_section
;
3908 size
= bfd_get_section_size (osect
->the_bfd_section
);
3909 for (i
= 0; i
< cache_novlys
; i
++)
3910 if (cache_ovly_table
[i
][VMA
] == bfd_section_vma (obfd
, bsect
)
3911 && cache_ovly_table
[i
][LMA
] == bfd_section_lma (obfd
, bsect
)
3912 /* && cache_ovly_table[i][SIZE] == size */ )
3914 read_target_long_array (cache_ovly_table_base
+ i
* TARGET_LONG_BYTES
,
3915 (unsigned int *) cache_ovly_table
[i
], 4);
3916 if (cache_ovly_table
[i
][VMA
] == bfd_section_vma (obfd
, bsect
)
3917 && cache_ovly_table
[i
][LMA
] == bfd_section_lma (obfd
, bsect
)
3918 /* && cache_ovly_table[i][SIZE] == size */ )
3920 osect
->ovly_mapped
= cache_ovly_table
[i
][MAPPED
];
3923 else /* Warning! Warning! Target's ovly table has changed! */
3929 /* Function: simple_overlay_update
3930 If OSECT is NULL, then update all sections' mapped state
3931 (after re-reading the entire target _ovly_table).
3932 If OSECT is non-NULL, then try to find a matching entry in the
3933 cached ovly_table and update only OSECT's mapped state.
3934 If a cached entry can't be found or the cache isn't valid, then
3935 re-read the entire cache, and go ahead and update all sections. */
3938 simple_overlay_update (struct obj_section
*osect
)
3940 struct objfile
*objfile
;
3942 /* Were we given an osect to look up? NULL means do all of them. */
3944 /* Have we got a cached copy of the target's overlay table? */
3945 if (cache_ovly_table
!= NULL
)
3946 /* Does its cached location match what's currently in the symtab? */
3947 if (cache_ovly_table_base
==
3948 SYMBOL_VALUE_ADDRESS (lookup_minimal_symbol ("_ovly_table", NULL
, NULL
)))
3949 /* Then go ahead and try to look up this single section in the cache */
3950 if (simple_overlay_update_1 (osect
))
3951 /* Found it! We're done. */
3954 /* Cached table no good: need to read the entire table anew.
3955 Or else we want all the sections, in which case it's actually
3956 more efficient to read the whole table in one block anyway. */
3958 if (! simple_read_overlay_table ())
3961 /* Now may as well update all sections, even if only one was requested. */
3962 ALL_OBJSECTIONS (objfile
, osect
)
3963 if (section_is_overlay (osect
->the_bfd_section
))
3966 bfd
*obfd
= osect
->objfile
->obfd
;
3967 asection
*bsect
= osect
->the_bfd_section
;
3969 size
= bfd_get_section_size (bsect
);
3970 for (i
= 0; i
< cache_novlys
; i
++)
3971 if (cache_ovly_table
[i
][VMA
] == bfd_section_vma (obfd
, bsect
)
3972 && cache_ovly_table
[i
][LMA
] == bfd_section_lma (obfd
, bsect
)
3973 /* && cache_ovly_table[i][SIZE] == size */ )
3974 { /* obj_section matches i'th entry in ovly_table */
3975 osect
->ovly_mapped
= cache_ovly_table
[i
][MAPPED
];
3976 break; /* finished with inner for loop: break out */
3981 /* Set the output sections and output offsets for section SECTP in
3982 ABFD. The relocation code in BFD will read these offsets, so we
3983 need to be sure they're initialized. We map each section to itself,
3984 with no offset; this means that SECTP->vma will be honored. */
3987 symfile_dummy_outputs (bfd
*abfd
, asection
*sectp
, void *dummy
)
3989 sectp
->output_section
= sectp
;
3990 sectp
->output_offset
= 0;
3993 /* Relocate the contents of a debug section SECTP in ABFD. The
3994 contents are stored in BUF if it is non-NULL, or returned in a
3995 malloc'd buffer otherwise.
3997 For some platforms and debug info formats, shared libraries contain
3998 relocations against the debug sections (particularly for DWARF-2;
3999 one affected platform is PowerPC GNU/Linux, although it depends on
4000 the version of the linker in use). Also, ELF object files naturally
4001 have unresolved relocations for their debug sections. We need to apply
4002 the relocations in order to get the locations of symbols correct. */
4005 symfile_relocate_debug_section (bfd
*abfd
, asection
*sectp
, bfd_byte
*buf
)
4007 /* We're only interested in debugging sections with relocation
4009 if ((sectp
->flags
& SEC_RELOC
) == 0)
4011 if ((sectp
->flags
& SEC_DEBUGGING
) == 0)
4014 /* We will handle section offsets properly elsewhere, so relocate as if
4015 all sections begin at 0. */
4016 bfd_map_over_sections (abfd
, symfile_dummy_outputs
, NULL
);
4018 return bfd_simple_get_relocated_section_contents (abfd
, sectp
, buf
, NULL
);
4021 struct symfile_segment_data
*
4022 get_symfile_segment_data (bfd
*abfd
)
4024 struct sym_fns
*sf
= find_sym_fns (abfd
);
4029 return sf
->sym_segments (abfd
);
4033 free_symfile_segment_data (struct symfile_segment_data
*data
)
4035 xfree (data
->segment_bases
);
4036 xfree (data
->segment_sizes
);
4037 xfree (data
->segment_info
);
4043 - DATA, containing segment addresses from the object file ABFD, and
4044 the mapping from ABFD's sections onto the segments that own them,
4046 - SEGMENT_BASES[0 .. NUM_SEGMENT_BASES - 1], holding the actual
4047 segment addresses reported by the target,
4048 store the appropriate offsets for each section in OFFSETS.
4050 If there are fewer entries in SEGMENT_BASES than there are segments
4051 in DATA, then apply SEGMENT_BASES' last entry to all the segments.
4053 If there are more entries, then ignore the extra. The target may
4054 not be able to distinguish between an empty data segment and a
4055 missing data segment; a missing text segment is less plausible. */
4057 symfile_map_offsets_to_segments (bfd
*abfd
, struct symfile_segment_data
*data
,
4058 struct section_offsets
*offsets
,
4059 int num_segment_bases
,
4060 const CORE_ADDR
*segment_bases
)
4065 /* It doesn't make sense to call this function unless you have some
4066 segment base addresses. */
4067 gdb_assert (segment_bases
> 0);
4069 /* If we do not have segment mappings for the object file, we
4070 can not relocate it by segments. */
4071 gdb_assert (data
!= NULL
);
4072 gdb_assert (data
->num_segments
> 0);
4074 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
4076 int which
= data
->segment_info
[i
];
4078 gdb_assert (0 <= which
&& which
<= data
->num_segments
);
4080 /* Don't bother computing offsets for sections that aren't
4081 loaded as part of any segment. */
4085 /* Use the last SEGMENT_BASES entry as the address of any extra
4086 segments mentioned in DATA->segment_info. */
4087 if (which
> num_segment_bases
)
4088 which
= num_segment_bases
;
4090 offsets
->offsets
[i
] = (segment_bases
[which
- 1]
4091 - data
->segment_bases
[which
- 1]);
4098 symfile_find_segment_sections (struct objfile
*objfile
)
4100 bfd
*abfd
= objfile
->obfd
;
4103 struct symfile_segment_data
*data
;
4105 data
= get_symfile_segment_data (objfile
->obfd
);
4109 if (data
->num_segments
!= 1 && data
->num_segments
!= 2)
4111 free_symfile_segment_data (data
);
4115 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
4118 int which
= data
->segment_info
[i
];
4122 if (objfile
->sect_index_text
== -1)
4123 objfile
->sect_index_text
= sect
->index
;
4125 if (objfile
->sect_index_rodata
== -1)
4126 objfile
->sect_index_rodata
= sect
->index
;
4128 else if (which
== 2)
4130 if (objfile
->sect_index_data
== -1)
4131 objfile
->sect_index_data
= sect
->index
;
4133 if (objfile
->sect_index_bss
== -1)
4134 objfile
->sect_index_bss
= sect
->index
;
4138 free_symfile_segment_data (data
);
4142 _initialize_symfile (void)
4144 struct cmd_list_element
*c
;
4146 c
= add_cmd ("symbol-file", class_files
, symbol_file_command
, _("\
4147 Load symbol table from executable file FILE.\n\
4148 The `file' command can also load symbol tables, as well as setting the file\n\
4149 to execute."), &cmdlist
);
4150 set_cmd_completer (c
, filename_completer
);
4152 c
= add_cmd ("add-symbol-file", class_files
, add_symbol_file_command
, _("\
4153 Load symbols from FILE, assuming FILE has been dynamically loaded.\n\
4154 Usage: add-symbol-file FILE ADDR [-s <SECT> <SECT_ADDR> -s <SECT> <SECT_ADDR> ...]\n\
4155 ADDR is the starting address of the file's text.\n\
4156 The optional arguments are section-name section-address pairs and\n\
4157 should be specified if the data and bss segments are not contiguous\n\
4158 with the text. SECT is a section name to be loaded at SECT_ADDR."),
4160 set_cmd_completer (c
, filename_completer
);
4162 c
= add_cmd ("add-shared-symbol-files", class_files
,
4163 add_shared_symbol_files_command
, _("\
4164 Load the symbols from shared objects in the dynamic linker's link map."),
4166 c
= add_alias_cmd ("assf", "add-shared-symbol-files", class_files
, 1,
4169 c
= add_cmd ("load", class_files
, load_command
, _("\
4170 Dynamically load FILE into the running program, and record its symbols\n\
4171 for access from GDB.\n\
4172 A load OFFSET may also be given."), &cmdlist
);
4173 set_cmd_completer (c
, filename_completer
);
4175 add_setshow_boolean_cmd ("symbol-reloading", class_support
,
4176 &symbol_reloading
, _("\
4177 Set dynamic symbol table reloading multiple times in one run."), _("\
4178 Show dynamic symbol table reloading multiple times in one run."), NULL
,
4180 show_symbol_reloading
,
4181 &setlist
, &showlist
);
4183 add_prefix_cmd ("overlay", class_support
, overlay_command
,
4184 _("Commands for debugging overlays."), &overlaylist
,
4185 "overlay ", 0, &cmdlist
);
4187 add_com_alias ("ovly", "overlay", class_alias
, 1);
4188 add_com_alias ("ov", "overlay", class_alias
, 1);
4190 add_cmd ("map-overlay", class_support
, map_overlay_command
,
4191 _("Assert that an overlay section is mapped."), &overlaylist
);
4193 add_cmd ("unmap-overlay", class_support
, unmap_overlay_command
,
4194 _("Assert that an overlay section is unmapped."), &overlaylist
);
4196 add_cmd ("list-overlays", class_support
, list_overlays_command
,
4197 _("List mappings of overlay sections."), &overlaylist
);
4199 add_cmd ("manual", class_support
, overlay_manual_command
,
4200 _("Enable overlay debugging."), &overlaylist
);
4201 add_cmd ("off", class_support
, overlay_off_command
,
4202 _("Disable overlay debugging."), &overlaylist
);
4203 add_cmd ("auto", class_support
, overlay_auto_command
,
4204 _("Enable automatic overlay debugging."), &overlaylist
);
4205 add_cmd ("load-target", class_support
, overlay_load_command
,
4206 _("Read the overlay mapping state from the target."), &overlaylist
);
4208 /* Filename extension to source language lookup table: */
4209 init_filename_language_table ();
4210 add_setshow_string_noescape_cmd ("extension-language", class_files
,
4212 Set mapping between filename extension and source language."), _("\
4213 Show mapping between filename extension and source language."), _("\
4214 Usage: set extension-language .foo bar"),
4215 set_ext_lang_command
,
4217 &setlist
, &showlist
);
4219 add_info ("extensions", info_ext_lang_command
,
4220 _("All filename extensions associated with a source language."));
4222 add_setshow_optional_filename_cmd ("debug-file-directory", class_support
,
4223 &debug_file_directory
, _("\
4224 Set the directory where separate debug symbols are searched for."), _("\
4225 Show the directory where separate debug symbols are searched for."), _("\
4226 Separate debug symbols are first searched for in the same\n\
4227 directory as the binary, then in the `" DEBUG_SUBDIRECTORY
"' subdirectory,\n\
4228 and lastly at the path of the directory of the binary with\n\
4229 the global debug-file directory prepended."),
4231 show_debug_file_directory
,
4232 &setlist
, &showlist
);
4234 add_setshow_boolean_cmd ("symbol-loading", no_class
,
4235 &print_symbol_loading
, _("\
4236 Set printing of symbol loading messages."), _("\
4237 Show printing of symbol loading messages."), NULL
,
4240 &setprintlist
, &showprintlist
);