From 31f7ba0423bfad4867253963a543e51cc05e0d89 Mon Sep 17 00:00:00 2001 From: Nick Clifton Date: Fri, 31 Jan 2003 10:04:16 +0000 Subject: [PATCH] bfd_follow_gnu_debuglink: New function. Follow the pointer contained inside a .gnu_debuglink section. --- bfd/ChangeLog | 11 ++ bfd/Makefile.am | 3 +- bfd/Makefile.in | 7 +- bfd/bfd-in2.h | 3 + bfd/opncls.c | 335 +++++++++++++++++++++++++++++++++++++++++++++++- 5 files changed, 354 insertions(+), 5 deletions(-) diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 53e6b0733e5..ef1e407cbac 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,14 @@ +2003-01-31 Graydon Hoare + + * Makefile.am (opncls.lo): Add dependency upon libiberty.h. + * Makefile.in: Regenerate. + * opncls.c (calc_crc32, get_debug_link_info, + seperate_debug_file_exists, find_seperate_debug_file): New + internal functions. + (bfd_follow_gnu_debuglink): New function. Follow the pointer + contained inside a .gnu_debuglink section. + * bfd-in2.h: Regenerate. + 2003-01-29 Alexandre Oliva * elfxx-mips.c (mips_elf_got_entry_hash): Don't dereference diff --git a/bfd/Makefile.am b/bfd/Makefile.am index bc92764c9a5..6f053197b5b 100644 --- a/bfd/Makefile.am +++ b/bfd/Makefile.am @@ -877,7 +877,8 @@ corefile.lo: corefile.c $(INCDIR)/filenames.h format.lo: format.c $(INCDIR)/filenames.h init.lo: init.c $(INCDIR)/filenames.h libbfd.lo: libbfd.c $(INCDIR)/filenames.h -opncls.lo: opncls.c $(INCDIR)/filenames.h $(INCDIR)/objalloc.h +opncls.lo: opncls.c $(INCDIR)/filenames.h $(INCDIR)/libiberty.h \ + $(INCDIR)/objalloc.h reloc.lo: reloc.c $(INCDIR)/filenames.h $(INCDIR)/bfdlink.h section.lo: section.c $(INCDIR)/filenames.h $(INCDIR)/bfdlink.h syms.lo: syms.c $(INCDIR)/filenames.h $(INCDIR)/safe-ctype.h \ diff --git a/bfd/Makefile.in b/bfd/Makefile.in index f3a9830b892..e6a600fd8a2 100644 --- a/bfd/Makefile.in +++ b/bfd/Makefile.in @@ -1,4 +1,4 @@ -# Makefile.in generated automatically by automake 1.4-p6 from Makefile.am +# Makefile.in generated automatically by automake 1.4-p5 from Makefile.am # Copyright (C) 1994, 1995-8, 1999, 2001 Free Software Foundation, Inc. # This Makefile.in is free software; the Free Software Foundation @@ -799,7 +799,7 @@ configure.in version.h DISTFILES = $(DIST_COMMON) $(SOURCES) $(HEADERS) $(TEXINFOS) $(EXTRA_DIST) -TAR = tar +TAR = gtar GZIP_ENV = --best SOURCES = $(libbfd_a_SOURCES) $(libbfd_la_SOURCES) OBJECTS = $(libbfd_a_OBJECTS) $(libbfd_la_OBJECTS) @@ -1410,7 +1410,8 @@ corefile.lo: corefile.c $(INCDIR)/filenames.h format.lo: format.c $(INCDIR)/filenames.h init.lo: init.c $(INCDIR)/filenames.h libbfd.lo: libbfd.c $(INCDIR)/filenames.h -opncls.lo: opncls.c $(INCDIR)/filenames.h $(INCDIR)/objalloc.h +opncls.lo: opncls.c $(INCDIR)/filenames.h $(INCDIR)/libiberty.h \ + $(INCDIR)/objalloc.h reloc.lo: reloc.c $(INCDIR)/filenames.h $(INCDIR)/bfdlink.h section.lo: section.c $(INCDIR)/filenames.h $(INCDIR)/bfdlink.h syms.lo: syms.c $(INCDIR)/filenames.h $(INCDIR)/safe-ctype.h \ diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h index 25f2f96c718..a0795994c3f 100644 --- a/bfd/bfd-in2.h +++ b/bfd/bfd-in2.h @@ -880,6 +880,9 @@ bfd_make_writable PARAMS ((bfd *abfd)); bfd_boolean bfd_make_readable PARAMS ((bfd *abfd)); +char * +bfd_follow_gnu_debuglink PARAMS ((bfd *abfd, const char *dir)); + /* Extracted from libbfd.c. */ /* Byte swapping macros for user section data. */ diff --git a/bfd/opncls.c b/bfd/opncls.c index c24438820bd..81bd2c83501 100644 --- a/bfd/opncls.c +++ b/bfd/opncls.c @@ -1,6 +1,6 @@ /* opncls.c -- open and close a BFD. Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, - 2001, 2002 + 2001, 2002, 2003 Free Software Foundation, Inc. Written by Cygnus Support. @@ -25,6 +25,7 @@ #include "sysdep.h" #include "objalloc.h" #include "libbfd.h" +#include "libiberty.h" #ifndef S_IXUSR #define S_IXUSR 0100 /* Execute by owner. */ @@ -699,3 +700,335 @@ bfd_release (abfd, block) { objalloc_free_block ((struct objalloc *) abfd->memory, block); } + + +/* + GNU Extension: separate debug-info files + + The idea here is that a special section called .gnu_debuglink might be + embedded in a binary file, which indicates that some *other* file + contains the real debugging information. This special section contains a + filename and CRC32 checksum, which we read and resolve to another file, + if it exists. + + This facilitates "optional" provision of debugging information, without + having to provide two complete copies of every binary object (with and + without debug symbols). +*/ + +static unsigned long calc_crc32 PARAMS ((unsigned long, const unsigned char *, size_t)); +static char * get_debug_link_info PARAMS ((bfd *, unsigned long *)); +static bfd_boolean separate_debug_file_exists PARAMS ((const char *, const unsigned long)); +static char * find_separate_debug_file PARAMS ((bfd *, const char *)); + +/* +INTERNAL_FUNCTION + calc_crc32 + +SYNOPSIS + unsigned long calc_crc32 (unsigned long crc, const unsigned char *buf, size_t len); + +DESCRIPTION + Advance the CRC32 given by @var{crc} through @var{len} + bytes of @var{buf}. Return the updated CRC32 value. +*/ + +static unsigned long +calc_crc32 (crc, buf, len) + unsigned long crc; + const unsigned char *buf; + size_t len; +{ + static const unsigned long crc32_table[256] = + { + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, + 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, + 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, + 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, + 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, + 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, + 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, + 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, + 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, + 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, + 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, + 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, + 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, + 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, + 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, + 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, + 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, + 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, + 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, + 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, + 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, + 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, + 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, + 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, + 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, + 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, + 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, + 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, + 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, + 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, + 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, + 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, + 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, + 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, + 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, + 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, + 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, + 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, + 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, + 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, + 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, + 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, + 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, + 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, + 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, + 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, + 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, + 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, + 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, + 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, + 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, + 0x2d02ef8d + }; + const unsigned char *end; + + crc = ~crc & 0xffffffff; + for (end = buf + len; buf < end; ++ buf) + crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8); + return ~crc & 0xffffffff;; +} + + +/* +INTERNAL_FUNCTION + get_debug_link_info + +SYNOPSIS + char *get_debug_link_info (bfd *abfd, unsigned long *crc32_out) + +DESCRIPTION + fetch the filename and CRC32 value for any separate debuginfo + associated with @var{abfd}. Return NULL if no such info found, + otherwise return filename and update @var{crc32_out}. +*/ + +static char * +get_debug_link_info (abfd, crc32_out) + bfd *abfd; + unsigned long *crc32_out; +{ + asection * sect; + bfd_size_type debuglink_size; + unsigned long crc32; + char * contents; + int crc_offset; + bfd_boolean ret; + + BFD_ASSERT (abfd); + BFD_ASSERT (crc32_out); + + sect = bfd_get_section_by_name (abfd, ".gnu_debuglink"); + + if (sect == NULL) + return NULL; + + debuglink_size = bfd_section_size (abfd, sect); + + contents = xmalloc (debuglink_size); + ret = bfd_get_section_contents (abfd, sect, contents, + (file_ptr)0, debuglink_size); + if (! ret) + { + free (contents); + return NULL; + } + + /* Crc value is stored after the filename, aligned up to 4 bytes. */ + crc_offset = strlen (contents) + 1; + crc_offset = (crc_offset + 3) & ~3; + + crc32 = bfd_get_32 (abfd, (bfd_byte *) (contents + crc_offset)); + + *crc32_out = crc32; + return contents; +} + +/* +INTERNAL_FUNCTION + separate_debug_file_exists + +SYNOPSIS + bfd_boolean separate_debug_file_exists (char * name, unsigned long crc32) + +DESCRIPTION + Checks to see if @var{name} is a file and if its contents + match @var{crc32}. +*/ + +static bfd_boolean +separate_debug_file_exists (name, crc) + const char *name; + const unsigned long crc; +{ + static char buffer [8 * 1024]; + unsigned long file_crc = 0; + int fd; + int count; + + BFD_ASSERT (name); + + fd = open (name, O_RDONLY); + if (fd < 0) + return FALSE; + + while ((count = read (fd, buffer, sizeof (buffer))) > 0) + file_crc = calc_crc32 (file_crc, buffer, count); + + close (fd); + + return crc == file_crc; +} + + +/* +INTERNAL_FUNCTION + find_separate_debug_file + +SYNOPSIS + char * find_separate_debug_file (bfd *abfd) + +DESCRIPTION + Searches @var{abfd} for a reference to separate debugging + information, scans various locations in the filesystem, including + the file tree rooted at @var{debug_file_directory}, and returns a + filename of such debugging information if the file is found and has + matching CRC32. Returns NULL if no reference to debugging file + exists, or file cannot be found. +*/ + +static char * +find_separate_debug_file (abfd, debug_file_directory) + bfd *abfd; + const char *debug_file_directory; +{ + char *basename; + char *dir; + char *debugfile; + unsigned long crc32; + int i; + + BFD_ASSERT (abfd); + if (debug_file_directory == NULL) + debug_file_directory = "."; + + /* BFD may have been opened from a stream. */ + if (! abfd->filename) + return NULL; + + basename = get_debug_link_info (abfd, & crc32); + + if (basename == NULL || strlen (basename) < 1) + return NULL; + + dir = xstrdup (abfd->filename); + BFD_ASSERT (strlen (dir) != 0); + + /* Strip off filename part. */ + for (i = strlen (dir) - 1; i >= 0; i--) + if (IS_DIR_SEPARATOR (dir[i])) + break; + + dir[i + 1] = '\0'; + BFD_ASSERT (dir[i] == '/' || dir[0] == '\0') + + debugfile = xmalloc (strlen (debug_file_directory) + 1 + + strlen (dir) + + strlen (".debug/") + + strlen (basename) + + 1); + + /* First try in the same directory as the original file: */ + strcpy (debugfile, dir); + strcat (debugfile, basename); + + if (separate_debug_file_exists (debugfile, crc32)) + { + free (basename); + free (dir); + return debugfile; + } + + /* Then try in a subdirectory called .debug. */ + strcpy (debugfile, dir); + strcat (debugfile, ".debug/"); + strcat (debugfile, basename); + + if (separate_debug_file_exists (debugfile, crc32)) + { + free (basename); + free (dir); + return debugfile; + } + + /* Then try in the global debugfile directory. */ + strcpy (debugfile, debug_file_directory); + i = strlen (debug_file_directory) - 1; + if (i > 0 + && debug_file_directory[i] != '/' + && dir[0] != '/') + strcat (debugfile, "/"); + strcat (debugfile, dir); + strcat (debugfile, basename); + + if (separate_debug_file_exists (debugfile, crc32)) + { + free (basename); + free (dir); + return debugfile; + } + + free (debugfile); + free (basename); + free (dir); + return NULL; +} + + +/* +FUNCTION + bfd_follow_gnu_debuglink + +SYNOPSIS + char * bfd_follow_gnu_debuglink(bfd *abfd, const char *dir); + +DESCRIPTION + + Takes a BFD and searches it for a .gnu_debuglink section. If this + section is found, examines the section for the name and checksum of + a '.debug' file containing auxiliary debugging + information. Searches filesystem for .debug file in some standard + locations, including the directory tree rooted at @var{dir}, and if + found returns the full filename. If @var{dir} is NULL, will search + default path configured into libbfd at build time. + +RETURNS + <> on any errors or failure to locate the .debug file, + otherwise a pointer to a heap-allocated string containing the + filename. The caller is responsible for freeing this string. +*/ + +char * +bfd_follow_gnu_debuglink (abfd, dir) + bfd *abfd; + const char * dir; +{ +#if 0 /* Disabled until DEBUGDIR can be defined by configure.in */ + if (dir == NULL) + dir = DEBUGDIR; +#endif + return find_separate_debug_file (abfd, dir); +} -- 2.30.2