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Diffstat (limited to 'pstack/rddbg.c')
| -rw-r--r-- | pstack/rddbg.c | 462 |
1 files changed, 462 insertions, 0 deletions
diff --git a/pstack/rddbg.c b/pstack/rddbg.c new file mode 100644 index 00000000000..be3dfc21c57 --- /dev/null +++ b/pstack/rddbg.c @@ -0,0 +1,462 @@ +/* rddbg.c -- Read debugging information into a generic form. + Copyright (C) 1995, 96, 1997 Free Software Foundation, Inc. + Written by Ian Lance Taylor <ian@cygnus.com>. + + This file is part of GNU Binutils. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ + +/* This file reads debugging information into a generic form. This + file knows how to dig the debugging information out of an object + file. */ + +#include <bfd.h> +#include "bucomm.h" +#include <libiberty.h> +#include "debug.h" +#include "budbg.h" + +static boolean read_section_stabs_debugging_info + PARAMS ((bfd *, asymbol **, long, PTR, boolean *)); +static boolean read_symbol_stabs_debugging_info + PARAMS ((bfd *, asymbol **, long, PTR, boolean *)); +static boolean read_ieee_debugging_info PARAMS ((bfd *, PTR, boolean *)); +static void save_stab PARAMS ((int, int, bfd_vma, const char *)); +static void stab_context PARAMS ((void)); +static void free_saved_stabs PARAMS ((void)); + +/* Read debugging information from a BFD. Returns a generic debugging + pointer. */ + +PTR +read_debugging_info (abfd, syms, symcount) + bfd *abfd; + asymbol **syms; + long symcount; +{ + PTR dhandle; + boolean found; + + dhandle = debug_init (); + if (dhandle == NULL) + return NULL; + + if (! read_section_stabs_debugging_info (abfd, syms, symcount, dhandle, + &found)) + return NULL; + + if (bfd_get_flavour (abfd) == bfd_target_aout_flavour) + { + if (! read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle, + &found)) + return NULL; + } + + if (bfd_get_flavour (abfd) == bfd_target_ieee_flavour) + { + if (! read_ieee_debugging_info (abfd, dhandle, &found)) + return NULL; + } + + /* Try reading the COFF symbols if we didn't find any stabs in COFF + sections. */ + if (! found + && bfd_get_flavour (abfd) == bfd_target_coff_flavour + && symcount > 0) + { +#if 0 +/* + * JZ: Do we need coff? + */ + if (! parse_coff (abfd, syms, symcount, dhandle)) +#else + fprintf (stderr, "%s: COFF support temporarily disabled\n", + bfd_get_filename (abfd)); + return NULL; +#endif + return NULL; + found = true; + } + + if (! found) + { + fprintf (stderr, "%s: no recognized debugging information\n", + bfd_get_filename (abfd)); + return NULL; + } + + return dhandle; +} + +/* Read stabs in sections debugging information from a BFD. */ + +static boolean +read_section_stabs_debugging_info (abfd, syms, symcount, dhandle, pfound) + bfd *abfd; + asymbol **syms; + long symcount; + PTR dhandle; + boolean *pfound; +{ + static struct + { + const char *secname; + const char *strsecname; + } names[] = { { ".stab", ".stabstr" } }; + unsigned int i; + PTR shandle; + + *pfound = false; + shandle = NULL; + + for (i = 0; i < sizeof names / sizeof names[0]; i++) + { + asection *sec, *strsec; + + sec = bfd_get_section_by_name (abfd, names[i].secname); + strsec = bfd_get_section_by_name (abfd, names[i].strsecname); + if (sec != NULL && strsec != NULL) + { + bfd_size_type stabsize, strsize; + bfd_byte *stabs, *strings; + bfd_byte *stab; + bfd_size_type stroff, next_stroff; + + stabsize = bfd_section_size (abfd, sec); + stabs = (bfd_byte *) xmalloc (stabsize); + if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize)) + { + fprintf (stderr, "%s: %s: %s\n", + bfd_get_filename (abfd), names[i].secname, + bfd_errmsg (bfd_get_error ())); + return false; + } + + strsize = bfd_section_size (abfd, strsec); + strings = (bfd_byte *) xmalloc (strsize); + if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize)) + { + fprintf (stderr, "%s: %s: %s\n", + bfd_get_filename (abfd), names[i].strsecname, + bfd_errmsg (bfd_get_error ())); + return false; + } + + if (shandle == NULL) + { + shandle = start_stab (dhandle, abfd, true, syms, symcount); + if (shandle == NULL) + return false; + } + + *pfound = true; + + stroff = 0; + next_stroff = 0; + for (stab = stabs; stab < stabs + stabsize; stab += 12) + { + bfd_size_type strx; + int type; + int other; + int desc; + bfd_vma value; + + /* This code presumes 32 bit values. */ + + strx = bfd_get_32 (abfd, stab); + type = bfd_get_8 (abfd, stab + 4); + other = bfd_get_8 (abfd, stab + 5); + desc = bfd_get_16 (abfd, stab + 6); + value = bfd_get_32 (abfd, stab + 8); + + if (type == 0) + { + /* Special type 0 stabs indicate the offset to the + next string table. */ + stroff = next_stroff; + next_stroff += value; + } + else + { + char *f, *s; + + f = NULL; + s = (char *) strings + stroff + strx; + while (s[strlen (s) - 1] == '\\' + && stab + 12 < stabs + stabsize) + { + char *p; + + stab += 12; + p = s + strlen (s) - 1; + *p = '\0'; + s = concat (s, + ((char *) strings + + stroff + + bfd_get_32 (abfd, stab)), + (const char *) NULL); + + /* We have to restore the backslash, because, if + the linker is hashing stabs strings, we may + see the same string more than once. */ + *p = '\\'; + + if (f != NULL) + free (f); + f = s; + } + + save_stab (type, desc, value, s); + + if (! parse_stab (dhandle, shandle, type, desc, value, s)) + { +#if 0 +/* + * JZ: skip the junk. + */ + stab_context (); + free_saved_stabs (); + return false; +#endif + } + + /* Don't free f, since I think the stabs code + expects strings to hang around. This should be + straightened out. FIXME. */ + } + } + + free_saved_stabs (); + free (stabs); + + /* Don't free strings, since I think the stabs code expects + the strings to hang around. This should be straightened + out. FIXME. */ + } + } + + if (shandle != NULL) + { + if (! finish_stab (dhandle, shandle)) + return false; + } + + return true; +} + +/* Read stabs in the symbol table. */ + +static boolean +read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle, pfound) + bfd *abfd; + asymbol **syms; + long symcount; + PTR dhandle; + boolean *pfound; +{ + PTR shandle; + asymbol **ps, **symend; + + shandle = NULL; + symend = syms + symcount; + for (ps = syms; ps < symend; ps++) + { + symbol_info i; + + bfd_get_symbol_info (abfd, *ps, &i); + + if (i.type == '-') + { + const char *s; + char *f; + + if (shandle == NULL) + { + shandle = start_stab (dhandle, abfd, false, syms, symcount); + if (shandle == NULL) + return false; + } + + *pfound = true; + + s = i.name; + f = NULL; + while (s[strlen (s) - 1] == '\\' + && ps + 1 < symend) + { + char *sc, *n; + + ++ps; + sc = xstrdup (s); + sc[strlen (sc) - 1] = '\0'; + n = concat (sc, bfd_asymbol_name (*ps), (const char *) NULL); + free (sc); + if (f != NULL) + free (f); + f = n; + s = n; + } + + save_stab (i.stab_type, i.stab_desc, i.value, s); + + if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc, + i.value, s)) + { + stab_context (); + free_saved_stabs (); + return false; + } + + /* Don't free f, since I think the stabs code expects + strings to hang around. This should be straightened out. + FIXME. */ + } + } + + free_saved_stabs (); + + if (shandle != NULL) + { + if (! finish_stab (dhandle, shandle)) + return false; + } + + return true; +} + +/* Read IEEE debugging information. */ + +static boolean +read_ieee_debugging_info (abfd, dhandle, pfound) + bfd *abfd; + PTR dhandle; + boolean *pfound; +{ + asection *dsec; + bfd_size_type size; + bfd_byte *contents; + + /* The BFD backend puts the debugging information into a section + named .debug. */ + + dsec = bfd_get_section_by_name (abfd, ".debug"); + if (dsec == NULL) + return true; + + size = bfd_section_size (abfd, dsec); + contents = (bfd_byte *) xmalloc (size); + if (! bfd_get_section_contents (abfd, dsec, contents, 0, size)) + return false; + + if (! parse_ieee (dhandle, abfd, contents, size)) + return false; + + free (contents); + + *pfound = true; + + return true; +} + +/* Record stabs strings, so that we can give some context for errors. */ + +#define SAVE_STABS_COUNT (16) + +struct saved_stab +{ + int type; + int desc; + bfd_vma value; + char *string; +}; + +static struct saved_stab saved_stabs[SAVE_STABS_COUNT]; +static int saved_stabs_index; + +/* Save a stabs string. */ + +static void +save_stab (type, desc, value, string) + int type; + int desc; + bfd_vma value; + const char *string; +{ + if (saved_stabs[saved_stabs_index].string != NULL) + free (saved_stabs[saved_stabs_index].string); + saved_stabs[saved_stabs_index].type = type; + saved_stabs[saved_stabs_index].desc = desc; + saved_stabs[saved_stabs_index].value = value; + saved_stabs[saved_stabs_index].string = xstrdup (string); + saved_stabs_index = (saved_stabs_index + 1) % SAVE_STABS_COUNT; +} + +/* Provide context for an error. */ + +static void +stab_context () +{ + int i; + + fprintf (stderr, "Last stabs entries before error:\n"); + fprintf (stderr, "n_type n_desc n_value string\n"); + + i = saved_stabs_index; + do + { + struct saved_stab *stabp; + + stabp = saved_stabs + i; + if (stabp->string != NULL) + { + const char *s; + + s = bfd_get_stab_name (stabp->type); + if (s != NULL) + fprintf (stderr, "%-6s", s); + else if (stabp->type == 0) + fprintf (stderr, "HdrSym"); + else + fprintf (stderr, "%-6d", stabp->type); + fprintf (stderr, " %-6d ", stabp->desc); + fprintf_vma (stderr, stabp->value); + if (stabp->type != 0) + fprintf (stderr, " %s", stabp->string); + fprintf (stderr, "\n"); + } + i = (i + 1) % SAVE_STABS_COUNT; + } + while (i != saved_stabs_index); +} + +/* Free the saved stab strings. */ + +static void +free_saved_stabs () +{ + int i; + + for (i = 0; i < SAVE_STABS_COUNT; i++) + { + if (saved_stabs[i].string != NULL) + { + free (saved_stabs[i].string); + saved_stabs[i].string = NULL; + } + } + + saved_stabs_index = 0; +} |