774 lines
21 KiB
C
774 lines
21 KiB
C
/* corefile.c
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Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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This file is part of GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "libiberty.h"
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#include "gprof.h"
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#include "search_list.h"
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#include "source.h"
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#include "symtab.h"
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#include "corefile.h"
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bfd *core_bfd;
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int core_num_syms;
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asymbol **core_syms;
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asection *core_text_sect;
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PTR core_text_space;
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int min_insn_size;
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int offset_to_code;
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/* For mapping symbols to specific .o files during file ordering. */
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struct function_map *symbol_map;
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unsigned int symbol_map_count;
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static void read_function_mappings PARAMS ((const char *));
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static int core_sym_class PARAMS ((asymbol *));
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static bfd_boolean get_src_info
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PARAMS ((bfd_vma, const char **, const char **, int *));
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extern void i386_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
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extern void alpha_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
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extern void vax_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
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extern void tahoe_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
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extern void sparc_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
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extern void mips_find_call PARAMS ((Sym *, bfd_vma, bfd_vma));
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static void
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read_function_mappings (filename)
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const char *filename;
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{
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FILE *file = fopen (filename, "r");
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char dummy[1024];
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int count = 0;
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if (!file)
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{
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fprintf (stderr, _("%s: could not open %s.\n"), whoami, filename);
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done (1);
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}
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/* First parse the mapping file so we know how big we need to
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make our tables. We also do some sanity checks at this
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time. */
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while (!feof (file))
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{
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int matches;
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matches = fscanf (file, "%[^\n:]", dummy);
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if (!matches)
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{
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fprintf (stderr, _("%s: unable to parse mapping file %s.\n"),
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whoami, filename);
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done (1);
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}
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/* Just skip messages about files with no symbols. */
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if (!strncmp (dummy, "No symbols in ", 14))
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{
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fscanf (file, "\n");
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continue;
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}
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/* Don't care what else is on this line at this point. */
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fscanf (file, "%[^\n]\n", dummy);
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count++;
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}
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/* Now we know how big we need to make our table. */
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symbol_map = ((struct function_map *)
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xmalloc (count * sizeof (struct function_map)));
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/* Rewind the input file so we can read it again. */
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rewind (file);
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/* Read each entry and put it into the table. */
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count = 0;
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while (!feof (file))
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{
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int matches;
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char *tmp;
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matches = fscanf (file, "%[^\n:]", dummy);
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if (!matches)
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{
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fprintf (stderr, _("%s: unable to parse mapping file %s.\n"),
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whoami, filename);
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done (1);
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}
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/* Just skip messages about files with no symbols. */
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if (!strncmp (dummy, "No symbols in ", 14))
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{
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fscanf (file, "\n");
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continue;
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}
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/* dummy has the filename, go ahead and copy it. */
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symbol_map[count].file_name = xmalloc (strlen (dummy) + 1);
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strcpy (symbol_map[count].file_name, dummy);
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/* Now we need the function name. */
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fscanf (file, "%[^\n]\n", dummy);
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tmp = strrchr (dummy, ' ') + 1;
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symbol_map[count].function_name = xmalloc (strlen (tmp) + 1);
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strcpy (symbol_map[count].function_name, tmp);
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count++;
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}
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/* Record the size of the map table for future reference. */
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symbol_map_count = count;
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}
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void
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core_init (aout_name)
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const char *aout_name;
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{
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core_bfd = bfd_openr (aout_name, 0);
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if (!core_bfd)
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{
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perror (aout_name);
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done (1);
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}
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if (!bfd_check_format (core_bfd, bfd_object))
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{
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fprintf (stderr, _("%s: %s: not in a.out format\n"), whoami, aout_name);
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done (1);
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}
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/* Get core's text section. */
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core_text_sect = bfd_get_section_by_name (core_bfd, ".text");
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if (!core_text_sect)
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{
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core_text_sect = bfd_get_section_by_name (core_bfd, "$CODE$");
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if (!core_text_sect)
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{
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fprintf (stderr, _("%s: can't find .text section in %s\n"),
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whoami, aout_name);
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done (1);
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}
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}
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/* Read core's symbol table. */
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/* This will probably give us more than we need, but that's ok. */
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core_num_syms = bfd_get_symtab_upper_bound (core_bfd);
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if (core_num_syms < 0)
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{
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fprintf (stderr, "%s: %s: %s\n", whoami, aout_name,
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bfd_errmsg (bfd_get_error ()));
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done (1);
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}
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core_syms = (asymbol **) xmalloc (core_num_syms);
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core_num_syms = bfd_canonicalize_symtab (core_bfd, core_syms);
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if (core_num_syms < 0)
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{
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fprintf (stderr, "%s: %s: %s\n", whoami, aout_name,
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bfd_errmsg (bfd_get_error ()));
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done (1);
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}
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min_insn_size = 1;
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offset_to_code = 0;
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switch (bfd_get_arch (core_bfd))
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{
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case bfd_arch_vax:
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case bfd_arch_tahoe:
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offset_to_code = 2;
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break;
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case bfd_arch_alpha:
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min_insn_size = 4;
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break;
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default:
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break;
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}
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if (function_mapping_file)
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read_function_mappings (function_mapping_file);
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}
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/* Read in the text space of an a.out file. */
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void
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core_get_text_space (cbfd)
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bfd *cbfd;
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{
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core_text_space = (PTR) malloc ((unsigned int) core_text_sect->_raw_size);
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if (!core_text_space)
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{
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fprintf (stderr, _("%s: ran out room for %lu bytes of text space\n"),
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whoami, (unsigned long) core_text_sect->_raw_size);
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done (1);
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}
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if (!bfd_get_section_contents (cbfd, core_text_sect, core_text_space,
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(bfd_vma) 0, core_text_sect->_raw_size))
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{
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bfd_perror ("bfd_get_section_contents");
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free (core_text_space);
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core_text_space = 0;
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}
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if (!core_text_space)
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fprintf (stderr, _("%s: can't do -c\n"), whoami);
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}
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void
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find_call (parent, p_lowpc, p_highpc)
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Sym *parent;
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bfd_vma p_lowpc;
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bfd_vma p_highpc;
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{
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switch (bfd_get_arch (core_bfd))
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{
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case bfd_arch_i386:
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i386_find_call (parent, p_lowpc, p_highpc);
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break;
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case bfd_arch_alpha:
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alpha_find_call (parent, p_lowpc, p_highpc);
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break;
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case bfd_arch_vax:
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vax_find_call (parent, p_lowpc, p_highpc);
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break;
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case bfd_arch_sparc:
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sparc_find_call (parent, p_lowpc, p_highpc);
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break;
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case bfd_arch_tahoe:
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tahoe_find_call (parent, p_lowpc, p_highpc);
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break;
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case bfd_arch_mips:
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mips_find_call (parent, p_lowpc, p_highpc);
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break;
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default:
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fprintf (stderr, _("%s: -c not supported on architecture %s\n"),
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whoami, bfd_printable_name(core_bfd));
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/* Don't give the error more than once. */
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ignore_direct_calls = FALSE;
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}
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}
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/* Return class of symbol SYM. The returned class can be any of:
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0 -> symbol is not interesting to us
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'T' -> symbol is a global name
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't' -> symbol is a local (static) name. */
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static int
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core_sym_class (sym)
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asymbol *sym;
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{
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symbol_info syminfo;
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const char *name;
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char sym_prefix;
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int i;
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if (sym->section == NULL || (sym->flags & BSF_DEBUGGING) != 0)
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return 0;
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/* Must be a text symbol, and static text symbols
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don't qualify if ignore_static_funcs set. */
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if (ignore_static_funcs && (sym->flags & BSF_LOCAL))
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{
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DBG (AOUTDEBUG, printf ("[core_sym_class] %s: not a function\n",
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sym->name));
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return 0;
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}
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bfd_get_symbol_info (core_bfd, sym, &syminfo);
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i = syminfo.type;
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if (i == 'T')
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return i; /* It's a global symbol. */
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if (i == 'W')
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/* Treat weak symbols as text symbols. FIXME: a weak symbol may
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also be a data symbol. */
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return 'T';
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if (i != 't')
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{
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/* Not a static text symbol. */
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DBG (AOUTDEBUG, printf ("[core_sym_class] %s is of class %c\n",
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sym->name, i));
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return 0;
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}
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/* Do some more filtering on static function-names. */
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if (ignore_static_funcs)
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return 0;
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/* Can't zero-length name or funny characters in name, where
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`funny' includes: `.' (.o file names) and `$' (Pascal labels). */
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if (!sym->name || sym->name[0] == '\0')
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return 0;
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for (name = sym->name; *name; ++name)
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{
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if (*name == '.' || *name == '$')
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return 0;
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}
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/* On systems where the C compiler adds an underscore to all
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names, static names without underscores seem usually to be
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labels in hand written assembler in the library. We don't want
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these names. This is certainly necessary on a Sparc running
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SunOS 4.1 (try profiling a program that does a lot of
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division). I don't know whether it has harmful side effects on
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other systems. Perhaps it should be made configurable. */
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sym_prefix = bfd_get_symbol_leading_char (core_bfd);
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if ((sym_prefix && sym_prefix != sym->name[0])
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/* GCC may add special symbols to help gdb figure out the file
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language. We want to ignore these, since sometimes they mask
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the real function. (dj@ctron) */
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|| !strncmp (sym->name, "__gnu_compiled", 14)
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|| !strncmp (sym->name, "___gnu_compiled", 15))
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{
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return 0;
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}
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/* If the object file supports marking of function symbols, then
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we can zap anything that doesn't have BSF_FUNCTION set. */
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if (ignore_non_functions && (sym->flags & BSF_FUNCTION) == 0)
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return 0;
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return 't'; /* It's a static text symbol. */
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}
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/* Get whatever source info we can get regarding address ADDR. */
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static bfd_boolean
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get_src_info (addr, filename, name, line_num)
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bfd_vma addr;
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const char **filename;
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const char **name;
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int *line_num;
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{
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const char *fname = 0, *func_name = 0;
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int l = 0;
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if (bfd_find_nearest_line (core_bfd, core_text_sect, core_syms,
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addr - core_text_sect->vma,
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&fname, &func_name, (unsigned int *) &l)
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&& fname && func_name && l)
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{
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DBG (AOUTDEBUG, printf ("[get_src_info] 0x%lx -> %s:%d (%s)\n",
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(unsigned long) addr, fname, l, func_name));
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*filename = fname;
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*name = func_name;
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*line_num = l;
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return TRUE;
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}
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else
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{
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DBG (AOUTDEBUG, printf ("[get_src_info] no info for 0x%lx (%s:%d,%s)\n",
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(long) addr, fname ? fname : "<unknown>", l,
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func_name ? func_name : "<unknown>"));
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return FALSE;
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}
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}
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/* Read in symbol table from core.
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One symbol per function is entered. */
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void
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core_create_function_syms (cbfd)
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bfd *cbfd ATTRIBUTE_UNUSED;
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{
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bfd_vma min_vma = ~(bfd_vma) 0;
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bfd_vma max_vma = 0;
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int class;
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long i, found, skip;
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unsigned int j;
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/* Pass 1 - determine upper bound on number of function names. */
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symtab.len = 0;
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for (i = 0; i < core_num_syms; ++i)
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{
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if (!core_sym_class (core_syms[i]))
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continue;
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/* This should be replaced with a binary search or hashed
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search. Gross.
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Don't create a symtab entry for a function that has
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a mapping to a file, unless it's the first function
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in the file. */
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skip = 0;
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for (j = 0; j < symbol_map_count; j++)
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if (!strcmp (core_syms[i]->name, symbol_map[j].function_name))
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{
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if (j > 0 && ! strcmp (symbol_map [j].file_name,
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symbol_map [j - 1].file_name))
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skip = 1;
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break;
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}
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if (!skip)
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++symtab.len;
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}
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if (symtab.len == 0)
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{
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fprintf (stderr, _("%s: file `%s' has no symbols\n"), whoami, a_out_name);
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done (1);
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}
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/* The "+ 2" is for the sentinels. */
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symtab.base = (Sym *) xmalloc ((symtab.len + 2) * sizeof (Sym));
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/* Pass 2 - create symbols. */
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symtab.limit = symtab.base;
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for (i = 0; i < core_num_syms; ++i)
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{
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asection *sym_sec;
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class = core_sym_class (core_syms[i]);
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if (!class)
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{
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DBG (AOUTDEBUG,
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printf ("[core_create_function_syms] rejecting: 0x%lx %s\n",
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(unsigned long) core_syms[i]->value,
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core_syms[i]->name));
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continue;
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}
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/* This should be replaced with a binary search or hashed
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search. Gross. */
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skip = 0;
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found = 0;
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for (j = 0; j < symbol_map_count; j++)
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if (!strcmp (core_syms[i]->name, symbol_map[j].function_name))
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{
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if (j > 0 && ! strcmp (symbol_map [j].file_name,
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symbol_map [j - 1].file_name))
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skip = 1;
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else
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found = j;
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break;
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}
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if (skip)
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continue;
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sym_init (symtab.limit);
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/* Symbol offsets are always section-relative. */
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sym_sec = core_syms[i]->section;
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symtab.limit->addr = core_syms[i]->value;
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if (sym_sec)
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symtab.limit->addr += bfd_get_section_vma (sym_sec->owner, sym_sec);
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if (symbol_map_count
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&& !strcmp (core_syms[i]->name, symbol_map[found].function_name))
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{
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symtab.limit->name = symbol_map[found].file_name;
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symtab.limit->mapped = 1;
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}
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else
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{
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symtab.limit->name = core_syms[i]->name;
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symtab.limit->mapped = 0;
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}
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/* Lookup filename and line number, if we can. */
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{
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const char *filename, *func_name;
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if (get_src_info (symtab.limit->addr, &filename, &func_name,
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&symtab.limit->line_num))
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{
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symtab.limit->file = source_file_lookup_path (filename);
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/* FIXME: Checking __osf__ here does not work with a cross
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gprof. */
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#ifdef __osf__
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/* Suppress symbols that are not function names. This is
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useful to suppress code-labels and aliases.
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This is known to be useful under DEC's OSF/1. Under SunOS 4.x,
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labels do not appear in the symbol table info, so this isn't
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necessary. */
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if (strcmp (symtab.limit->name, func_name) != 0)
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{
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/* The symbol's address maps to a different name, so
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it can't be a function-entry point. This happens
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for labels, for example. */
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||
DBG (AOUTDEBUG,
|
||
printf ("[core_create_function_syms: rej %s (maps to %s)\n",
|
||
symtab.limit->name, func_name));
|
||
continue;
|
||
}
|
||
#endif
|
||
}
|
||
}
|
||
|
||
symtab.limit->is_func = TRUE;
|
||
symtab.limit->is_bb_head = TRUE;
|
||
|
||
if (class == 't')
|
||
symtab.limit->is_static = TRUE;
|
||
|
||
/* Keep track of the minimum and maximum vma addresses used by all
|
||
symbols. When computing the max_vma, use the ending address of the
|
||
section containing the symbol, if available. */
|
||
min_vma = MIN (symtab.limit->addr, min_vma);
|
||
if (sym_sec)
|
||
max_vma = MAX (bfd_get_section_vma (sym_sec->owner, sym_sec)
|
||
+ bfd_section_size (sym_sec->owner, sym_sec) - 1,
|
||
max_vma);
|
||
else
|
||
max_vma = MAX (symtab.limit->addr, max_vma);
|
||
|
||
/* If we see "main" without an initial '_', we assume names
|
||
are *not* prefixed by '_'. */
|
||
if (symtab.limit->name[0] == 'm' && discard_underscores
|
||
&& strcmp (symtab.limit->name, "main") == 0)
|
||
discard_underscores = 0;
|
||
|
||
DBG (AOUTDEBUG, printf ("[core_create_function_syms] %ld %s 0x%lx\n",
|
||
(long) (symtab.limit - symtab.base),
|
||
symtab.limit->name,
|
||
(unsigned long) symtab.limit->addr));
|
||
++symtab.limit;
|
||
}
|
||
|
||
/* Create sentinels. */
|
||
sym_init (symtab.limit);
|
||
symtab.limit->name = "<locore>";
|
||
symtab.limit->addr = 0;
|
||
symtab.limit->end_addr = min_vma - 1;
|
||
++symtab.limit;
|
||
|
||
sym_init (symtab.limit);
|
||
symtab.limit->name = "<hicore>";
|
||
symtab.limit->addr = max_vma + 1;
|
||
symtab.limit->end_addr = ~(bfd_vma) 0;
|
||
++symtab.limit;
|
||
|
||
symtab.len = symtab.limit - symtab.base;
|
||
symtab_finalize (&symtab);
|
||
}
|
||
|
||
/* Read in symbol table from core.
|
||
One symbol per line of source code is entered. */
|
||
|
||
void
|
||
core_create_line_syms (cbfd)
|
||
bfd *cbfd;
|
||
{
|
||
char *prev_name, *prev_filename;
|
||
unsigned int prev_name_len, prev_filename_len;
|
||
bfd_vma vma, min_vma = ~(bfd_vma) 0, max_vma = 0;
|
||
bfd_vma offset;
|
||
Sym *prev, dummy, *sentinel, *sym;
|
||
const char *filename;
|
||
int prev_line_num;
|
||
Sym_Table ltab;
|
||
|
||
/* Create symbols for functions as usual. This is necessary in
|
||
cases where parts of a program were not compiled with -g. For
|
||
those parts we still want to get info at the function level. */
|
||
core_create_function_syms (cbfd);
|
||
|
||
/* Pass 1 - counter number of symbols. */
|
||
|
||
/* To find all line information, walk through all possible
|
||
text-space addresses (one by one!) and get the debugging
|
||
info for each address. When the debugging info changes,
|
||
it is time to create a new symbol.
|
||
|
||
Of course, this is rather slow and it would be better if
|
||
bfd would provide an iterator for enumerating all line infos. */
|
||
prev_name_len = PATH_MAX;
|
||
prev_filename_len = PATH_MAX;
|
||
prev_name = xmalloc (prev_name_len);
|
||
prev_filename = xmalloc (prev_filename_len);
|
||
ltab.len = 0;
|
||
prev_line_num = 0;
|
||
|
||
for (offset = 0; offset < core_text_sect->_raw_size; offset += min_insn_size)
|
||
{
|
||
unsigned int len;
|
||
|
||
vma = core_text_sect->vma + offset;
|
||
|
||
if (!get_src_info (vma, &filename, &dummy.name, &dummy.line_num)
|
||
|| (prev_line_num == dummy.line_num
|
||
&& prev_name != NULL
|
||
&& strcmp (prev_name, dummy.name) == 0
|
||
&& strcmp (prev_filename, filename) == 0))
|
||
continue;
|
||
|
||
++ltab.len;
|
||
prev_line_num = dummy.line_num;
|
||
|
||
len = strlen (dummy.name);
|
||
if (len >= prev_name_len)
|
||
{
|
||
prev_name_len = len + 1024;
|
||
free (prev_name);
|
||
prev_name = xmalloc (prev_name_len);
|
||
}
|
||
|
||
strcpy (prev_name, dummy.name);
|
||
len = strlen (filename);
|
||
|
||
if (len >= prev_filename_len)
|
||
{
|
||
prev_filename_len = len + 1024;
|
||
free (prev_filename);
|
||
prev_filename = xmalloc (prev_filename_len);
|
||
}
|
||
|
||
strcpy (prev_filename, filename);
|
||
|
||
min_vma = MIN (vma, min_vma);
|
||
max_vma = MAX (vma, max_vma);
|
||
}
|
||
|
||
free (prev_name);
|
||
free (prev_filename);
|
||
|
||
/* Make room for function symbols, too. */
|
||
ltab.len += symtab.len;
|
||
ltab.base = (Sym *) xmalloc (ltab.len * sizeof (Sym));
|
||
ltab.limit = ltab.base;
|
||
|
||
/* Pass 2 - create symbols. */
|
||
|
||
/* We now set is_static as we go along, rather than by running
|
||
through the symbol table at the end.
|
||
|
||
The old way called symtab_finalize before the is_static pass,
|
||
causing a problem since symtab_finalize uses is_static as part of
|
||
its address conflict resolution algorithm. Since global symbols
|
||
were prefered over static symbols, and all line symbols were
|
||
global at that point, static function names that conflicted with
|
||
their own line numbers (static, but labeled as global) were
|
||
rejected in favor of the line num.
|
||
|
||
This was not the desired functionality. We always want to keep
|
||
our function symbols and discard any conflicting line symbols.
|
||
Perhaps symtab_finalize should be modified to make this
|
||
distinction as well, but the current fix works and the code is a
|
||
lot cleaner now. */
|
||
prev = 0;
|
||
|
||
for (offset = 0; offset < core_text_sect->_raw_size; offset += min_insn_size)
|
||
{
|
||
sym_init (ltab.limit);
|
||
|
||
if (!get_src_info (core_text_sect->vma + offset, &filename,
|
||
<ab.limit->name, <ab.limit->line_num)
|
||
|| (prev && prev->line_num == ltab.limit->line_num
|
||
&& strcmp (prev->name, ltab.limit->name) == 0
|
||
&& strcmp (prev->file->name, filename) == 0))
|
||
continue;
|
||
|
||
/* Make name pointer a malloc'ed string. */
|
||
ltab.limit->name = xstrdup (ltab.limit->name);
|
||
ltab.limit->file = source_file_lookup_path (filename);
|
||
|
||
ltab.limit->addr = core_text_sect->vma + offset;
|
||
|
||
/* Set is_static based on the enclosing function, using either:
|
||
1) the previous symbol, if it's from the same function, or
|
||
2) a symtab lookup. */
|
||
if (prev && ltab.limit->file == prev->file &&
|
||
strcmp (ltab.limit->name, prev->name) == 0)
|
||
{
|
||
ltab.limit->is_static = prev->is_static;
|
||
}
|
||
else
|
||
{
|
||
sym = sym_lookup(&symtab, ltab.limit->addr);
|
||
ltab.limit->is_static = sym->is_static;
|
||
}
|
||
|
||
prev = ltab.limit;
|
||
|
||
/* If we see "main" without an initial '_', we assume names
|
||
are *not* prefixed by '_'. */
|
||
if (ltab.limit->name[0] == 'm' && discard_underscores
|
||
&& strcmp (ltab.limit->name, "main") == 0)
|
||
discard_underscores = 0;
|
||
|
||
DBG (AOUTDEBUG, printf ("[core_create_line_syms] %lu %s 0x%lx\n",
|
||
(unsigned long) (ltab.limit - ltab.base),
|
||
ltab.limit->name,
|
||
(unsigned long) ltab.limit->addr));
|
||
++ltab.limit;
|
||
}
|
||
|
||
/* Update sentinels. */
|
||
sentinel = sym_lookup (&symtab, (bfd_vma) 0);
|
||
|
||
if (sentinel
|
||
&& strcmp (sentinel->name, "<locore>") == 0
|
||
&& min_vma <= sentinel->end_addr)
|
||
sentinel->end_addr = min_vma - 1;
|
||
|
||
sentinel = sym_lookup (&symtab, ~(bfd_vma) 0);
|
||
|
||
if (sentinel
|
||
&& strcmp (sentinel->name, "<hicore>") == 0
|
||
&& max_vma >= sentinel->addr)
|
||
sentinel->addr = max_vma + 1;
|
||
|
||
/* Copy in function symbols. */
|
||
memcpy (ltab.limit, symtab.base, symtab.len * sizeof (Sym));
|
||
ltab.limit += symtab.len;
|
||
|
||
if ((unsigned int) (ltab.limit - ltab.base) != ltab.len)
|
||
{
|
||
fprintf (stderr,
|
||
_("%s: somebody miscounted: ltab.len=%d instead of %ld\n"),
|
||
whoami, ltab.len, (long) (ltab.limit - ltab.base));
|
||
done (1);
|
||
}
|
||
|
||
/* Finalize ltab and make it symbol table. */
|
||
symtab_finalize (<ab);
|
||
free (symtab.base);
|
||
symtab = ltab;
|
||
}
|