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https://sourceware.org/git/binutils-gdb.git
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bfd_follow_gnu_debuglink: New function. Follow the pointer contained inside a
.gnu_debuglink section.
This commit is contained in:
Nick Clifton
parent
38a94d4494
commit
31f7ba0423
@ -1,3 +1,14 @@
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2003-01-31 Graydon Hoare <graydon@redhat.com>
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* Makefile.am (opncls.lo): Add dependency upon libiberty.h.
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* Makefile.in: Regenerate.
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* opncls.c (calc_crc32, get_debug_link_info,
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seperate_debug_file_exists, find_seperate_debug_file): New
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internal functions.
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(bfd_follow_gnu_debuglink): New function. Follow the pointer
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contained inside a .gnu_debuglink section.
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* bfd-in2.h: Regenerate.
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2003-01-29 Alexandre Oliva <aoliva@redhat.com>
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* elfxx-mips.c (mips_elf_got_entry_hash): Don't dereference
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@ -877,7 +877,8 @@ corefile.lo: corefile.c $(INCDIR)/filenames.h
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format.lo: format.c $(INCDIR)/filenames.h
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init.lo: init.c $(INCDIR)/filenames.h
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libbfd.lo: libbfd.c $(INCDIR)/filenames.h
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opncls.lo: opncls.c $(INCDIR)/filenames.h $(INCDIR)/objalloc.h
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opncls.lo: opncls.c $(INCDIR)/filenames.h $(INCDIR)/libiberty.h \
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$(INCDIR)/objalloc.h
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reloc.lo: reloc.c $(INCDIR)/filenames.h $(INCDIR)/bfdlink.h
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section.lo: section.c $(INCDIR)/filenames.h $(INCDIR)/bfdlink.h
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syms.lo: syms.c $(INCDIR)/filenames.h $(INCDIR)/safe-ctype.h \
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@ -1,4 +1,4 @@
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# Makefile.in generated automatically by automake 1.4-p6 from Makefile.am
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# Makefile.in generated automatically by automake 1.4-p5 from Makefile.am
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# Copyright (C) 1994, 1995-8, 1999, 2001 Free Software Foundation, Inc.
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# This Makefile.in is free software; the Free Software Foundation
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@ -799,7 +799,7 @@ configure.in version.h
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DISTFILES = $(DIST_COMMON) $(SOURCES) $(HEADERS) $(TEXINFOS) $(EXTRA_DIST)
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TAR = tar
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TAR = gtar
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GZIP_ENV = --best
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SOURCES = $(libbfd_a_SOURCES) $(libbfd_la_SOURCES)
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OBJECTS = $(libbfd_a_OBJECTS) $(libbfd_la_OBJECTS)
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@ -1410,7 +1410,8 @@ corefile.lo: corefile.c $(INCDIR)/filenames.h
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format.lo: format.c $(INCDIR)/filenames.h
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init.lo: init.c $(INCDIR)/filenames.h
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libbfd.lo: libbfd.c $(INCDIR)/filenames.h
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opncls.lo: opncls.c $(INCDIR)/filenames.h $(INCDIR)/objalloc.h
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opncls.lo: opncls.c $(INCDIR)/filenames.h $(INCDIR)/libiberty.h \
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$(INCDIR)/objalloc.h
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reloc.lo: reloc.c $(INCDIR)/filenames.h $(INCDIR)/bfdlink.h
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section.lo: section.c $(INCDIR)/filenames.h $(INCDIR)/bfdlink.h
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syms.lo: syms.c $(INCDIR)/filenames.h $(INCDIR)/safe-ctype.h \
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@ -880,6 +880,9 @@ bfd_make_writable PARAMS ((bfd *abfd));
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bfd_boolean
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bfd_make_readable PARAMS ((bfd *abfd));
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char *
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bfd_follow_gnu_debuglink PARAMS ((bfd *abfd, const char *dir));
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/* Extracted from libbfd.c. */
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/* Byte swapping macros for user section data. */
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335
bfd/opncls.c
335
bfd/opncls.c
@ -1,6 +1,6 @@
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/* opncls.c -- open and close a BFD.
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Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000,
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2001, 2002
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2001, 2002, 2003
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Free Software Foundation, Inc.
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Written by Cygnus Support.
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@ -25,6 +25,7 @@
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#include "sysdep.h"
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#include "objalloc.h"
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#include "libbfd.h"
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#include "libiberty.h"
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#ifndef S_IXUSR
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#define S_IXUSR 0100 /* Execute by owner. */
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@ -699,3 +700,335 @@ bfd_release (abfd, block)
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{
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objalloc_free_block ((struct objalloc *) abfd->memory, block);
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}
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/*
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GNU Extension: separate debug-info files
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The idea here is that a special section called .gnu_debuglink might be
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embedded in a binary file, which indicates that some *other* file
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contains the real debugging information. This special section contains a
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filename and CRC32 checksum, which we read and resolve to another file,
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if it exists.
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This facilitates "optional" provision of debugging information, without
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having to provide two complete copies of every binary object (with and
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without debug symbols).
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*/
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static unsigned long calc_crc32 PARAMS ((unsigned long, const unsigned char *, size_t));
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static char * get_debug_link_info PARAMS ((bfd *, unsigned long *));
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static bfd_boolean separate_debug_file_exists PARAMS ((const char *, const unsigned long));
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static char * find_separate_debug_file PARAMS ((bfd *, const char *));
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/*
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INTERNAL_FUNCTION
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calc_crc32
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SYNOPSIS
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unsigned long calc_crc32 (unsigned long crc, const unsigned char *buf, size_t len);
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DESCRIPTION
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Advance the CRC32 given by @var{crc} through @var{len}
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bytes of @var{buf}. Return the updated CRC32 value.
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*/
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static unsigned long
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calc_crc32 (crc, buf, len)
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unsigned long crc;
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const unsigned char *buf;
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size_t len;
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{
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static const unsigned long crc32_table[256] =
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{
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
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0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
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0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
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0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
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0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
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0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
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0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
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0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
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0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
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0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
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0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
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0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
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0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
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0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
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0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
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0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
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0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
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0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
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0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
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0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
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0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
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0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
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0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
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0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
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0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
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0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
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0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
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0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
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0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
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0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
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0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
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0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
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0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
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0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
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0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
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0x2d02ef8d
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};
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const unsigned char *end;
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crc = ~crc & 0xffffffff;
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for (end = buf + len; buf < end; ++ buf)
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crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
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return ~crc & 0xffffffff;;
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}
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/*
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INTERNAL_FUNCTION
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get_debug_link_info
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SYNOPSIS
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char *get_debug_link_info (bfd *abfd, unsigned long *crc32_out)
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DESCRIPTION
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fetch the filename and CRC32 value for any separate debuginfo
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associated with @var{abfd}. Return NULL if no such info found,
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otherwise return filename and update @var{crc32_out}.
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*/
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static char *
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get_debug_link_info (abfd, crc32_out)
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bfd *abfd;
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unsigned long *crc32_out;
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{
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asection * sect;
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bfd_size_type debuglink_size;
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unsigned long crc32;
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char * contents;
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int crc_offset;
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bfd_boolean ret;
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BFD_ASSERT (abfd);
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BFD_ASSERT (crc32_out);
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sect = bfd_get_section_by_name (abfd, ".gnu_debuglink");
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if (sect == NULL)
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return NULL;
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debuglink_size = bfd_section_size (abfd, sect);
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contents = xmalloc (debuglink_size);
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ret = bfd_get_section_contents (abfd, sect, contents,
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(file_ptr)0, debuglink_size);
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if (! ret)
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{
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free (contents);
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return NULL;
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}
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/* Crc value is stored after the filename, aligned up to 4 bytes. */
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crc_offset = strlen (contents) + 1;
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crc_offset = (crc_offset + 3) & ~3;
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crc32 = bfd_get_32 (abfd, (bfd_byte *) (contents + crc_offset));
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*crc32_out = crc32;
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return contents;
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}
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/*
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INTERNAL_FUNCTION
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separate_debug_file_exists
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SYNOPSIS
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bfd_boolean separate_debug_file_exists (char * name, unsigned long crc32)
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DESCRIPTION
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Checks to see if @var{name} is a file and if its contents
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match @var{crc32}.
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*/
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static bfd_boolean
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separate_debug_file_exists (name, crc)
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const char *name;
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const unsigned long crc;
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{
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static char buffer [8 * 1024];
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unsigned long file_crc = 0;
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int fd;
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int count;
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BFD_ASSERT (name);
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fd = open (name, O_RDONLY);
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if (fd < 0)
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return FALSE;
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while ((count = read (fd, buffer, sizeof (buffer))) > 0)
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file_crc = calc_crc32 (file_crc, buffer, count);
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close (fd);
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return crc == file_crc;
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}
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/*
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INTERNAL_FUNCTION
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find_separate_debug_file
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SYNOPSIS
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char * find_separate_debug_file (bfd *abfd)
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DESCRIPTION
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Searches @var{abfd} for a reference to separate debugging
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information, scans various locations in the filesystem, including
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the file tree rooted at @var{debug_file_directory}, and returns a
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filename of such debugging information if the file is found and has
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matching CRC32. Returns NULL if no reference to debugging file
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exists, or file cannot be found.
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*/
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static char *
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find_separate_debug_file (abfd, debug_file_directory)
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bfd *abfd;
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const char *debug_file_directory;
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{
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char *basename;
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char *dir;
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char *debugfile;
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unsigned long crc32;
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int i;
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BFD_ASSERT (abfd);
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if (debug_file_directory == NULL)
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debug_file_directory = ".";
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/* BFD may have been opened from a stream. */
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if (! abfd->filename)
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return NULL;
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basename = get_debug_link_info (abfd, & crc32);
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if (basename == NULL || strlen (basename) < 1)
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return NULL;
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dir = xstrdup (abfd->filename);
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BFD_ASSERT (strlen (dir) != 0);
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/* Strip off filename part. */
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for (i = strlen (dir) - 1; i >= 0; i--)
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if (IS_DIR_SEPARATOR (dir[i]))
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break;
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dir[i + 1] = '\0';
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BFD_ASSERT (dir[i] == '/' || dir[0] == '\0')
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debugfile = xmalloc (strlen (debug_file_directory) + 1
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+ strlen (dir)
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+ strlen (".debug/")
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+ strlen (basename)
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+ 1);
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/* First try in the same directory as the original file: */
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strcpy (debugfile, dir);
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strcat (debugfile, basename);
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if (separate_debug_file_exists (debugfile, crc32))
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{
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free (basename);
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free (dir);
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return debugfile;
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}
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/* Then try in a subdirectory called .debug. */
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strcpy (debugfile, dir);
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strcat (debugfile, ".debug/");
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strcat (debugfile, basename);
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if (separate_debug_file_exists (debugfile, crc32))
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{
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free (basename);
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free (dir);
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return debugfile;
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}
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/* Then try in the global debugfile directory. */
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strcpy (debugfile, debug_file_directory);
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i = strlen (debug_file_directory) - 1;
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if (i > 0
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&& debug_file_directory[i] != '/'
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&& dir[0] != '/')
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strcat (debugfile, "/");
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strcat (debugfile, dir);
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strcat (debugfile, basename);
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if (separate_debug_file_exists (debugfile, crc32))
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{
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free (basename);
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free (dir);
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return debugfile;
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}
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free (debugfile);
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free (basename);
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free (dir);
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return NULL;
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}
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/*
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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
|
||||
<<NULL>> 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);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user