3436 lines
89 KiB
C
3436 lines
89 KiB
C
/* elf.c -- Get debug data from an ELF file for backtraces.
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Copyright (C) 2012-2020 Free Software Foundation, Inc.
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Written by Ian Lance Taylor, Google.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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(1) Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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(2) Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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(3) The name of the author may not be used to
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endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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#include "config.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#ifdef HAVE_DL_ITERATE_PHDR
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#include <link.h>
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#endif
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#include "backtrace.h"
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#include "internal.h"
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#ifndef S_ISLNK
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#ifndef S_IFLNK
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#define S_IFLNK 0120000
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#endif
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#ifndef S_IFMT
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#define S_IFMT 0170000
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#endif
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#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
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#endif
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#ifndef __GNUC__
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#define __builtin_prefetch(p, r, l)
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#define unlikely(x) (x)
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#else
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#endif
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#if !defined(HAVE_DECL_STRNLEN) || !HAVE_DECL_STRNLEN
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/* If strnlen is not declared, provide our own version. */
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static size_t
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xstrnlen (const char *s, size_t maxlen)
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{
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size_t i;
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for (i = 0; i < maxlen; ++i)
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if (s[i] == '\0')
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break;
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return i;
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}
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#define strnlen xstrnlen
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#endif
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#ifndef HAVE_LSTAT
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/* Dummy version of lstat for systems that don't have it. */
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static int
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xlstat (const char *path ATTRIBUTE_UNUSED, struct stat *st ATTRIBUTE_UNUSED)
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{
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return -1;
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}
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#define lstat xlstat
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#endif
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#ifndef HAVE_READLINK
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/* Dummy version of readlink for systems that don't have it. */
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static ssize_t
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xreadlink (const char *path ATTRIBUTE_UNUSED, char *buf ATTRIBUTE_UNUSED,
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size_t bufsz ATTRIBUTE_UNUSED)
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{
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return -1;
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}
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#define readlink xreadlink
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#endif
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#ifndef HAVE_DL_ITERATE_PHDR
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/* Dummy version of dl_iterate_phdr for systems that don't have it. */
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#define dl_phdr_info x_dl_phdr_info
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#define dl_iterate_phdr x_dl_iterate_phdr
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struct dl_phdr_info
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{
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uintptr_t dlpi_addr;
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const char *dlpi_name;
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};
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static int
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dl_iterate_phdr (int (*callback) (struct dl_phdr_info *,
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size_t, void *) ATTRIBUTE_UNUSED,
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void *data ATTRIBUTE_UNUSED)
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{
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return 0;
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}
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#endif /* ! defined (HAVE_DL_ITERATE_PHDR) */
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/* The configure script must tell us whether we are 32-bit or 64-bit
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ELF. We could make this code test and support either possibility,
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but there is no point. This code only works for the currently
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running executable, which means that we know the ELF mode at
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configure time. */
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#if BACKTRACE_ELF_SIZE != 32 && BACKTRACE_ELF_SIZE != 64
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#error "Unknown BACKTRACE_ELF_SIZE"
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#endif
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/* <link.h> might #include <elf.h> which might define our constants
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with slightly different values. Undefine them to be safe. */
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#undef EI_NIDENT
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#undef EI_MAG0
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#undef EI_MAG1
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#undef EI_MAG2
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#undef EI_MAG3
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#undef EI_CLASS
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#undef EI_DATA
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#undef EI_VERSION
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#undef ELF_MAG0
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#undef ELF_MAG1
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#undef ELF_MAG2
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#undef ELF_MAG3
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#undef ELFCLASS32
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#undef ELFCLASS64
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#undef ELFDATA2LSB
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#undef ELFDATA2MSB
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#undef EV_CURRENT
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#undef ET_DYN
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#undef EM_PPC64
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#undef EF_PPC64_ABI
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#undef SHN_LORESERVE
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#undef SHN_XINDEX
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#undef SHN_UNDEF
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#undef SHT_PROGBITS
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#undef SHT_SYMTAB
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#undef SHT_STRTAB
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#undef SHT_DYNSYM
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#undef SHF_COMPRESSED
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#undef STT_OBJECT
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#undef STT_FUNC
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#undef NT_GNU_BUILD_ID
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#undef ELFCOMPRESS_ZLIB
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/* Basic types. */
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typedef uint16_t b_elf_half; /* Elf_Half. */
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typedef uint32_t b_elf_word; /* Elf_Word. */
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typedef int32_t b_elf_sword; /* Elf_Sword. */
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#if BACKTRACE_ELF_SIZE == 32
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typedef uint32_t b_elf_addr; /* Elf_Addr. */
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typedef uint32_t b_elf_off; /* Elf_Off. */
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typedef uint32_t b_elf_wxword; /* 32-bit Elf_Word, 64-bit ELF_Xword. */
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#else
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typedef uint64_t b_elf_addr; /* Elf_Addr. */
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typedef uint64_t b_elf_off; /* Elf_Off. */
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typedef uint64_t b_elf_xword; /* Elf_Xword. */
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typedef int64_t b_elf_sxword; /* Elf_Sxword. */
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typedef uint64_t b_elf_wxword; /* 32-bit Elf_Word, 64-bit ELF_Xword. */
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#endif
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/* Data structures and associated constants. */
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#define EI_NIDENT 16
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typedef struct {
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unsigned char e_ident[EI_NIDENT]; /* ELF "magic number" */
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b_elf_half e_type; /* Identifies object file type */
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b_elf_half e_machine; /* Specifies required architecture */
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b_elf_word e_version; /* Identifies object file version */
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b_elf_addr e_entry; /* Entry point virtual address */
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b_elf_off e_phoff; /* Program header table file offset */
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b_elf_off e_shoff; /* Section header table file offset */
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b_elf_word e_flags; /* Processor-specific flags */
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b_elf_half e_ehsize; /* ELF header size in bytes */
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b_elf_half e_phentsize; /* Program header table entry size */
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b_elf_half e_phnum; /* Program header table entry count */
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b_elf_half e_shentsize; /* Section header table entry size */
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b_elf_half e_shnum; /* Section header table entry count */
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b_elf_half e_shstrndx; /* Section header string table index */
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} b_elf_ehdr; /* Elf_Ehdr. */
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#define EI_MAG0 0
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#define EI_MAG1 1
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#define EI_MAG2 2
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#define EI_MAG3 3
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#define EI_CLASS 4
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#define EI_DATA 5
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#define EI_VERSION 6
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#define ELFMAG0 0x7f
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#define ELFMAG1 'E'
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#define ELFMAG2 'L'
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#define ELFMAG3 'F'
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#define ELFCLASS32 1
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#define ELFCLASS64 2
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#define ELFDATA2LSB 1
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#define ELFDATA2MSB 2
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#define EV_CURRENT 1
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#define ET_DYN 3
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#define EM_PPC64 21
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#define EF_PPC64_ABI 3
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typedef struct {
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b_elf_word sh_name; /* Section name, index in string tbl */
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b_elf_word sh_type; /* Type of section */
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b_elf_wxword sh_flags; /* Miscellaneous section attributes */
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b_elf_addr sh_addr; /* Section virtual addr at execution */
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b_elf_off sh_offset; /* Section file offset */
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b_elf_wxword sh_size; /* Size of section in bytes */
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b_elf_word sh_link; /* Index of another section */
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b_elf_word sh_info; /* Additional section information */
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b_elf_wxword sh_addralign; /* Section alignment */
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b_elf_wxword sh_entsize; /* Entry size if section holds table */
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} b_elf_shdr; /* Elf_Shdr. */
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#define SHN_UNDEF 0x0000 /* Undefined section */
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#define SHN_LORESERVE 0xFF00 /* Begin range of reserved indices */
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#define SHN_XINDEX 0xFFFF /* Section index is held elsewhere */
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#define SHT_PROGBITS 1
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#define SHT_SYMTAB 2
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#define SHT_STRTAB 3
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#define SHT_DYNSYM 11
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#define SHF_COMPRESSED 0x800
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#if BACKTRACE_ELF_SIZE == 32
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typedef struct
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{
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b_elf_word st_name; /* Symbol name, index in string tbl */
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b_elf_addr st_value; /* Symbol value */
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b_elf_word st_size; /* Symbol size */
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unsigned char st_info; /* Symbol binding and type */
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unsigned char st_other; /* Visibility and other data */
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b_elf_half st_shndx; /* Symbol section index */
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} b_elf_sym; /* Elf_Sym. */
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#else /* BACKTRACE_ELF_SIZE != 32 */
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typedef struct
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{
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b_elf_word st_name; /* Symbol name, index in string tbl */
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unsigned char st_info; /* Symbol binding and type */
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unsigned char st_other; /* Visibility and other data */
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b_elf_half st_shndx; /* Symbol section index */
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b_elf_addr st_value; /* Symbol value */
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b_elf_xword st_size; /* Symbol size */
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} b_elf_sym; /* Elf_Sym. */
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#endif /* BACKTRACE_ELF_SIZE != 32 */
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#define STT_OBJECT 1
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#define STT_FUNC 2
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typedef struct
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{
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uint32_t namesz;
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uint32_t descsz;
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uint32_t type;
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char name[1];
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} b_elf_note;
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#define NT_GNU_BUILD_ID 3
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#if BACKTRACE_ELF_SIZE == 32
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typedef struct
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{
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b_elf_word ch_type; /* Compresstion algorithm */
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b_elf_word ch_size; /* Uncompressed size */
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b_elf_word ch_addralign; /* Alignment for uncompressed data */
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} b_elf_chdr; /* Elf_Chdr */
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#else /* BACKTRACE_ELF_SIZE != 32 */
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typedef struct
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{
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b_elf_word ch_type; /* Compression algorithm */
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b_elf_word ch_reserved; /* Reserved */
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b_elf_xword ch_size; /* Uncompressed size */
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b_elf_xword ch_addralign; /* Alignment for uncompressed data */
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} b_elf_chdr; /* Elf_Chdr */
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#endif /* BACKTRACE_ELF_SIZE != 32 */
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#define ELFCOMPRESS_ZLIB 1
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/* Names of sections, indexed by enum dwarf_section in internal.h. */
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static const char * const dwarf_section_names[DEBUG_MAX] =
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{
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".debug_info",
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".debug_line",
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".debug_abbrev",
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".debug_ranges",
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".debug_str",
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".debug_addr",
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".debug_str_offsets",
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".debug_line_str",
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".debug_rnglists"
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};
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/* Information we gather for the sections we care about. */
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struct debug_section_info
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{
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/* Section file offset. */
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off_t offset;
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/* Section size. */
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size_t size;
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/* Section contents, after read from file. */
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const unsigned char *data;
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/* Whether the SHF_COMPRESSED flag is set for the section. */
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int compressed;
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};
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/* Information we keep for an ELF symbol. */
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struct elf_symbol
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{
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/* The name of the symbol. */
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const char *name;
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/* The address of the symbol. */
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uintptr_t address;
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/* The size of the symbol. */
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size_t size;
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};
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/* Information to pass to elf_syminfo. */
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struct elf_syminfo_data
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{
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/* Symbols for the next module. */
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struct elf_syminfo_data *next;
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/* The ELF symbols, sorted by address. */
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struct elf_symbol *symbols;
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/* The number of symbols. */
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size_t count;
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};
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/* Information about PowerPC64 ELFv1 .opd section. */
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struct elf_ppc64_opd_data
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{
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/* Address of the .opd section. */
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b_elf_addr addr;
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/* Section data. */
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const char *data;
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/* Size of the .opd section. */
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size_t size;
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/* Corresponding section view. */
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struct backtrace_view view;
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};
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/* Compute the CRC-32 of BUF/LEN. This uses the CRC used for
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.gnu_debuglink files. */
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static uint32_t
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elf_crc32 (uint32_t crc, const unsigned char *buf, size_t len)
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{
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static const uint32_t 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,
|
|
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;
|
|
for (end = buf + len; buf < end; ++ buf)
|
|
crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
|
|
return ~crc;
|
|
}
|
|
|
|
/* Return the CRC-32 of the entire file open at DESCRIPTOR. */
|
|
|
|
static uint32_t
|
|
elf_crc32_file (struct backtrace_state *state, int descriptor,
|
|
backtrace_error_callback error_callback, void *data)
|
|
{
|
|
struct stat st;
|
|
struct backtrace_view file_view;
|
|
uint32_t ret;
|
|
|
|
if (fstat (descriptor, &st) < 0)
|
|
{
|
|
error_callback (data, "fstat", errno);
|
|
return 0;
|
|
}
|
|
|
|
if (!backtrace_get_view (state, descriptor, 0, st.st_size, error_callback,
|
|
data, &file_view))
|
|
return 0;
|
|
|
|
ret = elf_crc32 (0, (const unsigned char *) file_view.data, st.st_size);
|
|
|
|
backtrace_release_view (state, &file_view, error_callback, data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* A dummy callback function used when we can't find any debug info. */
|
|
|
|
static int
|
|
elf_nodebug (struct backtrace_state *state ATTRIBUTE_UNUSED,
|
|
uintptr_t pc ATTRIBUTE_UNUSED,
|
|
backtrace_full_callback callback ATTRIBUTE_UNUSED,
|
|
backtrace_error_callback error_callback, void *data)
|
|
{
|
|
error_callback (data, "no debug info in ELF executable", -1);
|
|
return 0;
|
|
}
|
|
|
|
/* A dummy callback function used when we can't find a symbol
|
|
table. */
|
|
|
|
static void
|
|
elf_nosyms (struct backtrace_state *state ATTRIBUTE_UNUSED,
|
|
uintptr_t addr ATTRIBUTE_UNUSED,
|
|
backtrace_syminfo_callback callback ATTRIBUTE_UNUSED,
|
|
backtrace_error_callback error_callback, void *data)
|
|
{
|
|
error_callback (data, "no symbol table in ELF executable", -1);
|
|
}
|
|
|
|
/* Compare struct elf_symbol for qsort. */
|
|
|
|
static int
|
|
elf_symbol_compare (const void *v1, const void *v2)
|
|
{
|
|
const struct elf_symbol *e1 = (const struct elf_symbol *) v1;
|
|
const struct elf_symbol *e2 = (const struct elf_symbol *) v2;
|
|
|
|
if (e1->address < e2->address)
|
|
return -1;
|
|
else if (e1->address > e2->address)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* Compare an ADDR against an elf_symbol for bsearch. We allocate one
|
|
extra entry in the array so that this can look safely at the next
|
|
entry. */
|
|
|
|
static int
|
|
elf_symbol_search (const void *vkey, const void *ventry)
|
|
{
|
|
const uintptr_t *key = (const uintptr_t *) vkey;
|
|
const struct elf_symbol *entry = (const struct elf_symbol *) ventry;
|
|
uintptr_t addr;
|
|
|
|
addr = *key;
|
|
if (addr < entry->address)
|
|
return -1;
|
|
else if (addr >= entry->address + entry->size)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* Initialize the symbol table info for elf_syminfo. */
|
|
|
|
static int
|
|
elf_initialize_syminfo (struct backtrace_state *state,
|
|
uintptr_t base_address,
|
|
const unsigned char *symtab_data, size_t symtab_size,
|
|
const unsigned char *strtab, size_t strtab_size,
|
|
backtrace_error_callback error_callback,
|
|
void *data, struct elf_syminfo_data *sdata,
|
|
struct elf_ppc64_opd_data *opd)
|
|
{
|
|
size_t sym_count;
|
|
const b_elf_sym *sym;
|
|
size_t elf_symbol_count;
|
|
size_t elf_symbol_size;
|
|
struct elf_symbol *elf_symbols;
|
|
size_t i;
|
|
unsigned int j;
|
|
|
|
sym_count = symtab_size / sizeof (b_elf_sym);
|
|
|
|
/* We only care about function symbols. Count them. */
|
|
sym = (const b_elf_sym *) symtab_data;
|
|
elf_symbol_count = 0;
|
|
for (i = 0; i < sym_count; ++i, ++sym)
|
|
{
|
|
int info;
|
|
|
|
info = sym->st_info & 0xf;
|
|
if ((info == STT_FUNC || info == STT_OBJECT)
|
|
&& sym->st_shndx != SHN_UNDEF)
|
|
++elf_symbol_count;
|
|
}
|
|
|
|
elf_symbol_size = elf_symbol_count * sizeof (struct elf_symbol);
|
|
elf_symbols = ((struct elf_symbol *)
|
|
backtrace_alloc (state, elf_symbol_size, error_callback,
|
|
data));
|
|
if (elf_symbols == NULL)
|
|
return 0;
|
|
|
|
sym = (const b_elf_sym *) symtab_data;
|
|
j = 0;
|
|
for (i = 0; i < sym_count; ++i, ++sym)
|
|
{
|
|
int info;
|
|
|
|
info = sym->st_info & 0xf;
|
|
if (info != STT_FUNC && info != STT_OBJECT)
|
|
continue;
|
|
if (sym->st_shndx == SHN_UNDEF)
|
|
continue;
|
|
if (sym->st_name >= strtab_size)
|
|
{
|
|
error_callback (data, "symbol string index out of range", 0);
|
|
backtrace_free (state, elf_symbols, elf_symbol_size, error_callback,
|
|
data);
|
|
return 0;
|
|
}
|
|
elf_symbols[j].name = (const char *) strtab + sym->st_name;
|
|
/* Special case PowerPC64 ELFv1 symbols in .opd section, if the symbol
|
|
is a function descriptor, read the actual code address from the
|
|
descriptor. */
|
|
if (opd
|
|
&& sym->st_value >= opd->addr
|
|
&& sym->st_value < opd->addr + opd->size)
|
|
elf_symbols[j].address
|
|
= *(const b_elf_addr *) (opd->data + (sym->st_value - opd->addr));
|
|
else
|
|
elf_symbols[j].address = sym->st_value;
|
|
elf_symbols[j].address += base_address;
|
|
elf_symbols[j].size = sym->st_size;
|
|
++j;
|
|
}
|
|
|
|
backtrace_qsort (elf_symbols, elf_symbol_count, sizeof (struct elf_symbol),
|
|
elf_symbol_compare);
|
|
|
|
sdata->next = NULL;
|
|
sdata->symbols = elf_symbols;
|
|
sdata->count = elf_symbol_count;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Add EDATA to the list in STATE. */
|
|
|
|
static void
|
|
elf_add_syminfo_data (struct backtrace_state *state,
|
|
struct elf_syminfo_data *edata)
|
|
{
|
|
if (!state->threaded)
|
|
{
|
|
struct elf_syminfo_data **pp;
|
|
|
|
for (pp = (struct elf_syminfo_data **) (void *) &state->syminfo_data;
|
|
*pp != NULL;
|
|
pp = &(*pp)->next)
|
|
;
|
|
*pp = edata;
|
|
}
|
|
else
|
|
{
|
|
while (1)
|
|
{
|
|
struct elf_syminfo_data **pp;
|
|
|
|
pp = (struct elf_syminfo_data **) (void *) &state->syminfo_data;
|
|
|
|
while (1)
|
|
{
|
|
struct elf_syminfo_data *p;
|
|
|
|
p = backtrace_atomic_load_pointer (pp);
|
|
|
|
if (p == NULL)
|
|
break;
|
|
|
|
pp = &p->next;
|
|
}
|
|
|
|
if (__sync_bool_compare_and_swap (pp, NULL, edata))
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Return the symbol name and value for an ADDR. */
|
|
|
|
static void
|
|
elf_syminfo (struct backtrace_state *state, uintptr_t addr,
|
|
backtrace_syminfo_callback callback,
|
|
backtrace_error_callback error_callback ATTRIBUTE_UNUSED,
|
|
void *data)
|
|
{
|
|
struct elf_syminfo_data *edata;
|
|
struct elf_symbol *sym = NULL;
|
|
|
|
if (!state->threaded)
|
|
{
|
|
for (edata = (struct elf_syminfo_data *) state->syminfo_data;
|
|
edata != NULL;
|
|
edata = edata->next)
|
|
{
|
|
sym = ((struct elf_symbol *)
|
|
bsearch (&addr, edata->symbols, edata->count,
|
|
sizeof (struct elf_symbol), elf_symbol_search));
|
|
if (sym != NULL)
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
struct elf_syminfo_data **pp;
|
|
|
|
pp = (struct elf_syminfo_data **) (void *) &state->syminfo_data;
|
|
while (1)
|
|
{
|
|
edata = backtrace_atomic_load_pointer (pp);
|
|
if (edata == NULL)
|
|
break;
|
|
|
|
sym = ((struct elf_symbol *)
|
|
bsearch (&addr, edata->symbols, edata->count,
|
|
sizeof (struct elf_symbol), elf_symbol_search));
|
|
if (sym != NULL)
|
|
break;
|
|
|
|
pp = &edata->next;
|
|
}
|
|
}
|
|
|
|
if (sym == NULL)
|
|
callback (data, addr, NULL, 0, 0);
|
|
else
|
|
callback (data, addr, sym->name, sym->address, sym->size);
|
|
}
|
|
|
|
/* Return whether FILENAME is a symlink. */
|
|
|
|
static int
|
|
elf_is_symlink (const char *filename)
|
|
{
|
|
struct stat st;
|
|
|
|
if (lstat (filename, &st) < 0)
|
|
return 0;
|
|
return S_ISLNK (st.st_mode);
|
|
}
|
|
|
|
/* Return the results of reading the symlink FILENAME in a buffer
|
|
allocated by backtrace_alloc. Return the length of the buffer in
|
|
*LEN. */
|
|
|
|
static char *
|
|
elf_readlink (struct backtrace_state *state, const char *filename,
|
|
backtrace_error_callback error_callback, void *data,
|
|
size_t *plen)
|
|
{
|
|
size_t len;
|
|
char *buf;
|
|
|
|
len = 128;
|
|
while (1)
|
|
{
|
|
ssize_t rl;
|
|
|
|
buf = backtrace_alloc (state, len, error_callback, data);
|
|
if (buf == NULL)
|
|
return NULL;
|
|
rl = readlink (filename, buf, len);
|
|
if (rl < 0)
|
|
{
|
|
backtrace_free (state, buf, len, error_callback, data);
|
|
return NULL;
|
|
}
|
|
if ((size_t) rl < len - 1)
|
|
{
|
|
buf[rl] = '\0';
|
|
*plen = len;
|
|
return buf;
|
|
}
|
|
backtrace_free (state, buf, len, error_callback, data);
|
|
len *= 2;
|
|
}
|
|
}
|
|
|
|
#define SYSTEM_BUILD_ID_DIR "/usr/lib/debug/.build-id/"
|
|
|
|
/* Open a separate debug info file, using the build ID to find it.
|
|
Returns an open file descriptor, or -1.
|
|
|
|
The GDB manual says that the only place gdb looks for a debug file
|
|
when the build ID is known is in /usr/lib/debug/.build-id. */
|
|
|
|
static int
|
|
elf_open_debugfile_by_buildid (struct backtrace_state *state,
|
|
const char *buildid_data, size_t buildid_size,
|
|
backtrace_error_callback error_callback,
|
|
void *data)
|
|
{
|
|
const char * const prefix = SYSTEM_BUILD_ID_DIR;
|
|
const size_t prefix_len = strlen (prefix);
|
|
const char * const suffix = ".debug";
|
|
const size_t suffix_len = strlen (suffix);
|
|
size_t len;
|
|
char *bd_filename;
|
|
char *t;
|
|
size_t i;
|
|
int ret;
|
|
int does_not_exist;
|
|
|
|
len = prefix_len + buildid_size * 2 + suffix_len + 2;
|
|
bd_filename = backtrace_alloc (state, len, error_callback, data);
|
|
if (bd_filename == NULL)
|
|
return -1;
|
|
|
|
t = bd_filename;
|
|
memcpy (t, prefix, prefix_len);
|
|
t += prefix_len;
|
|
for (i = 0; i < buildid_size; i++)
|
|
{
|
|
unsigned char b;
|
|
unsigned char nib;
|
|
|
|
b = (unsigned char) buildid_data[i];
|
|
nib = (b & 0xf0) >> 4;
|
|
*t++ = nib < 10 ? '0' + nib : 'a' + nib - 10;
|
|
nib = b & 0x0f;
|
|
*t++ = nib < 10 ? '0' + nib : 'a' + nib - 10;
|
|
if (i == 0)
|
|
*t++ = '/';
|
|
}
|
|
memcpy (t, suffix, suffix_len);
|
|
t[suffix_len] = '\0';
|
|
|
|
ret = backtrace_open (bd_filename, error_callback, data, &does_not_exist);
|
|
|
|
backtrace_free (state, bd_filename, len, error_callback, data);
|
|
|
|
/* gdb checks that the debuginfo file has the same build ID note.
|
|
That seems kind of pointless to me--why would it have the right
|
|
name but not the right build ID?--so skipping the check. */
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Try to open a file whose name is PREFIX (length PREFIX_LEN)
|
|
concatenated with PREFIX2 (length PREFIX2_LEN) concatenated with
|
|
DEBUGLINK_NAME. Returns an open file descriptor, or -1. */
|
|
|
|
static int
|
|
elf_try_debugfile (struct backtrace_state *state, const char *prefix,
|
|
size_t prefix_len, const char *prefix2, size_t prefix2_len,
|
|
const char *debuglink_name,
|
|
backtrace_error_callback error_callback, void *data)
|
|
{
|
|
size_t debuglink_len;
|
|
size_t try_len;
|
|
char *try;
|
|
int does_not_exist;
|
|
int ret;
|
|
|
|
debuglink_len = strlen (debuglink_name);
|
|
try_len = prefix_len + prefix2_len + debuglink_len + 1;
|
|
try = backtrace_alloc (state, try_len, error_callback, data);
|
|
if (try == NULL)
|
|
return -1;
|
|
|
|
memcpy (try, prefix, prefix_len);
|
|
memcpy (try + prefix_len, prefix2, prefix2_len);
|
|
memcpy (try + prefix_len + prefix2_len, debuglink_name, debuglink_len);
|
|
try[prefix_len + prefix2_len + debuglink_len] = '\0';
|
|
|
|
ret = backtrace_open (try, error_callback, data, &does_not_exist);
|
|
|
|
backtrace_free (state, try, try_len, error_callback, data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Find a separate debug info file, using the debuglink section data
|
|
to find it. Returns an open file descriptor, or -1. */
|
|
|
|
static int
|
|
elf_find_debugfile_by_debuglink (struct backtrace_state *state,
|
|
const char *filename,
|
|
const char *debuglink_name,
|
|
backtrace_error_callback error_callback,
|
|
void *data)
|
|
{
|
|
int ret;
|
|
char *alc;
|
|
size_t alc_len;
|
|
const char *slash;
|
|
int ddescriptor;
|
|
const char *prefix;
|
|
size_t prefix_len;
|
|
|
|
/* Resolve symlinks in FILENAME. Since FILENAME is fairly likely to
|
|
be /proc/self/exe, symlinks are common. We don't try to resolve
|
|
the whole path name, just the base name. */
|
|
ret = -1;
|
|
alc = NULL;
|
|
alc_len = 0;
|
|
while (elf_is_symlink (filename))
|
|
{
|
|
char *new_buf;
|
|
size_t new_len;
|
|
|
|
new_buf = elf_readlink (state, filename, error_callback, data, &new_len);
|
|
if (new_buf == NULL)
|
|
break;
|
|
|
|
if (new_buf[0] == '/')
|
|
filename = new_buf;
|
|
else
|
|
{
|
|
slash = strrchr (filename, '/');
|
|
if (slash == NULL)
|
|
filename = new_buf;
|
|
else
|
|
{
|
|
size_t clen;
|
|
char *c;
|
|
|
|
slash++;
|
|
clen = slash - filename + strlen (new_buf) + 1;
|
|
c = backtrace_alloc (state, clen, error_callback, data);
|
|
if (c == NULL)
|
|
goto done;
|
|
|
|
memcpy (c, filename, slash - filename);
|
|
memcpy (c + (slash - filename), new_buf, strlen (new_buf));
|
|
c[slash - filename + strlen (new_buf)] = '\0';
|
|
backtrace_free (state, new_buf, new_len, error_callback, data);
|
|
filename = c;
|
|
new_buf = c;
|
|
new_len = clen;
|
|
}
|
|
}
|
|
|
|
if (alc != NULL)
|
|
backtrace_free (state, alc, alc_len, error_callback, data);
|
|
alc = new_buf;
|
|
alc_len = new_len;
|
|
}
|
|
|
|
/* Look for DEBUGLINK_NAME in the same directory as FILENAME. */
|
|
|
|
slash = strrchr (filename, '/');
|
|
if (slash == NULL)
|
|
{
|
|
prefix = "";
|
|
prefix_len = 0;
|
|
}
|
|
else
|
|
{
|
|
slash++;
|
|
prefix = filename;
|
|
prefix_len = slash - filename;
|
|
}
|
|
|
|
ddescriptor = elf_try_debugfile (state, prefix, prefix_len, "", 0,
|
|
debuglink_name, error_callback, data);
|
|
if (ddescriptor >= 0)
|
|
{
|
|
ret = ddescriptor;
|
|
goto done;
|
|
}
|
|
|
|
/* Look for DEBUGLINK_NAME in a .debug subdirectory of FILENAME. */
|
|
|
|
ddescriptor = elf_try_debugfile (state, prefix, prefix_len, ".debug/",
|
|
strlen (".debug/"), debuglink_name,
|
|
error_callback, data);
|
|
if (ddescriptor >= 0)
|
|
{
|
|
ret = ddescriptor;
|
|
goto done;
|
|
}
|
|
|
|
/* Look for DEBUGLINK_NAME in /usr/lib/debug. */
|
|
|
|
ddescriptor = elf_try_debugfile (state, "/usr/lib/debug/",
|
|
strlen ("/usr/lib/debug/"), prefix,
|
|
prefix_len, debuglink_name,
|
|
error_callback, data);
|
|
if (ddescriptor >= 0)
|
|
ret = ddescriptor;
|
|
|
|
done:
|
|
if (alc != NULL && alc_len > 0)
|
|
backtrace_free (state, alc, alc_len, error_callback, data);
|
|
return ret;
|
|
}
|
|
|
|
/* Open a separate debug info file, using the debuglink section data
|
|
to find it. Returns an open file descriptor, or -1. */
|
|
|
|
static int
|
|
elf_open_debugfile_by_debuglink (struct backtrace_state *state,
|
|
const char *filename,
|
|
const char *debuglink_name,
|
|
uint32_t debuglink_crc,
|
|
backtrace_error_callback error_callback,
|
|
void *data)
|
|
{
|
|
int ddescriptor;
|
|
|
|
ddescriptor = elf_find_debugfile_by_debuglink (state, filename,
|
|
debuglink_name,
|
|
error_callback, data);
|
|
if (ddescriptor < 0)
|
|
return -1;
|
|
|
|
if (debuglink_crc != 0)
|
|
{
|
|
uint32_t got_crc;
|
|
|
|
got_crc = elf_crc32_file (state, ddescriptor, error_callback, data);
|
|
if (got_crc != debuglink_crc)
|
|
{
|
|
backtrace_close (ddescriptor, error_callback, data);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return ddescriptor;
|
|
}
|
|
|
|
/* A function useful for setting a breakpoint for an inflation failure
|
|
when this code is compiled with -g. */
|
|
|
|
static void
|
|
elf_zlib_failed(void)
|
|
{
|
|
}
|
|
|
|
/* *PVAL is the current value being read from the stream, and *PBITS
|
|
is the number of valid bits. Ensure that *PVAL holds at least 15
|
|
bits by reading additional bits from *PPIN, up to PINEND, as
|
|
needed. Updates *PPIN, *PVAL and *PBITS. Returns 1 on success, 0
|
|
on error. */
|
|
|
|
static int
|
|
elf_zlib_fetch (const unsigned char **ppin, const unsigned char *pinend,
|
|
uint64_t *pval, unsigned int *pbits)
|
|
{
|
|
unsigned int bits;
|
|
const unsigned char *pin;
|
|
uint64_t val;
|
|
uint32_t next;
|
|
|
|
bits = *pbits;
|
|
if (bits >= 15)
|
|
return 1;
|
|
pin = *ppin;
|
|
val = *pval;
|
|
|
|
if (unlikely (pinend - pin < 4))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) \
|
|
&& defined(__ORDER_BIG_ENDIAN__) \
|
|
&& (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ \
|
|
|| __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
|
|
/* We've ensured that PIN is aligned. */
|
|
next = *(const uint32_t *)pin;
|
|
|
|
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
|
|
next = __builtin_bswap32 (next);
|
|
#endif
|
|
#else
|
|
next = pin[0] | (pin[1] << 8) | (pin[2] << 16) | (pin[3] << 24);
|
|
#endif
|
|
|
|
val |= (uint64_t)next << bits;
|
|
bits += 32;
|
|
pin += 4;
|
|
|
|
/* We will need the next four bytes soon. */
|
|
__builtin_prefetch (pin, 0, 0);
|
|
|
|
*ppin = pin;
|
|
*pval = val;
|
|
*pbits = bits;
|
|
return 1;
|
|
}
|
|
|
|
/* Huffman code tables, like the rest of the zlib format, are defined
|
|
by RFC 1951. We store a Huffman code table as a series of tables
|
|
stored sequentially in memory. Each entry in a table is 16 bits.
|
|
The first, main, table has 256 entries. It is followed by a set of
|
|
secondary tables of length 2 to 128 entries. The maximum length of
|
|
a code sequence in the deflate format is 15 bits, so that is all we
|
|
need. Each secondary table has an index, which is the offset of
|
|
the table in the overall memory storage.
|
|
|
|
The deflate format says that all codes of a given bit length are
|
|
lexicographically consecutive. Perhaps we could have 130 values
|
|
that require a 15-bit code, perhaps requiring three secondary
|
|
tables of size 128. I don't know if this is actually possible, but
|
|
it suggests that the maximum size required for secondary tables is
|
|
3 * 128 + 3 * 64 ... == 768. The zlib enough program reports 660
|
|
as the maximum. We permit 768, since in addition to the 256 for
|
|
the primary table, with two bytes per entry, and with the two
|
|
tables we need, that gives us a page.
|
|
|
|
A single table entry needs to store a value or (for the main table
|
|
only) the index and size of a secondary table. Values range from 0
|
|
to 285, inclusive. Secondary table indexes, per above, range from
|
|
0 to 510. For a value we need to store the number of bits we need
|
|
to determine that value (one value may appear multiple times in the
|
|
table), which is 1 to 8. For a secondary table we need to store
|
|
the number of bits used to index into the table, which is 1 to 7.
|
|
And of course we need 1 bit to decide whether we have a value or a
|
|
secondary table index. So each entry needs 9 bits for value/table
|
|
index, 3 bits for size, 1 bit what it is. For simplicity we use 16
|
|
bits per entry. */
|
|
|
|
/* Number of entries we allocate to for one code table. We get a page
|
|
for the two code tables we need. */
|
|
|
|
#define HUFFMAN_TABLE_SIZE (1024)
|
|
|
|
/* Bit masks and shifts for the values in the table. */
|
|
|
|
#define HUFFMAN_VALUE_MASK 0x01ff
|
|
#define HUFFMAN_BITS_SHIFT 9
|
|
#define HUFFMAN_BITS_MASK 0x7
|
|
#define HUFFMAN_SECONDARY_SHIFT 12
|
|
|
|
/* For working memory while inflating we need two code tables, we need
|
|
an array of code lengths (max value 15, so we use unsigned char),
|
|
and an array of unsigned shorts used while building a table. The
|
|
latter two arrays must be large enough to hold the maximum number
|
|
of code lengths, which RFC 1951 defines as 286 + 30. */
|
|
|
|
#define ZDEBUG_TABLE_SIZE \
|
|
(2 * HUFFMAN_TABLE_SIZE * sizeof (uint16_t) \
|
|
+ (286 + 30) * sizeof (uint16_t) \
|
|
+ (286 + 30) * sizeof (unsigned char))
|
|
|
|
#define ZDEBUG_TABLE_CODELEN_OFFSET \
|
|
(2 * HUFFMAN_TABLE_SIZE * sizeof (uint16_t) \
|
|
+ (286 + 30) * sizeof (uint16_t))
|
|
|
|
#define ZDEBUG_TABLE_WORK_OFFSET \
|
|
(2 * HUFFMAN_TABLE_SIZE * sizeof (uint16_t))
|
|
|
|
#ifdef BACKTRACE_GENERATE_FIXED_HUFFMAN_TABLE
|
|
|
|
/* Used by the main function that generates the fixed table to learn
|
|
the table size. */
|
|
static size_t final_next_secondary;
|
|
|
|
#endif
|
|
|
|
/* Build a Huffman code table from an array of lengths in CODES of
|
|
length CODES_LEN. The table is stored into *TABLE. ZDEBUG_TABLE
|
|
is the same as for elf_zlib_inflate, used to find some work space.
|
|
Returns 1 on success, 0 on error. */
|
|
|
|
static int
|
|
elf_zlib_inflate_table (unsigned char *codes, size_t codes_len,
|
|
uint16_t *zdebug_table, uint16_t *table)
|
|
{
|
|
uint16_t count[16];
|
|
uint16_t start[16];
|
|
uint16_t prev[16];
|
|
uint16_t firstcode[7];
|
|
uint16_t *next;
|
|
size_t i;
|
|
size_t j;
|
|
unsigned int code;
|
|
size_t next_secondary;
|
|
|
|
/* Count the number of code of each length. Set NEXT[val] to be the
|
|
next value after VAL with the same bit length. */
|
|
|
|
next = (uint16_t *) (((unsigned char *) zdebug_table)
|
|
+ ZDEBUG_TABLE_WORK_OFFSET);
|
|
|
|
memset (&count[0], 0, 16 * sizeof (uint16_t));
|
|
for (i = 0; i < codes_len; ++i)
|
|
{
|
|
if (unlikely (codes[i] >= 16))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
if (count[codes[i]] == 0)
|
|
{
|
|
start[codes[i]] = i;
|
|
prev[codes[i]] = i;
|
|
}
|
|
else
|
|
{
|
|
next[prev[codes[i]]] = i;
|
|
prev[codes[i]] = i;
|
|
}
|
|
|
|
++count[codes[i]];
|
|
}
|
|
|
|
/* For each length, fill in the table for the codes of that
|
|
length. */
|
|
|
|
memset (table, 0, HUFFMAN_TABLE_SIZE * sizeof (uint16_t));
|
|
|
|
/* Handle the values that do not require a secondary table. */
|
|
|
|
code = 0;
|
|
for (j = 1; j <= 8; ++j)
|
|
{
|
|
unsigned int jcnt;
|
|
unsigned int val;
|
|
|
|
jcnt = count[j];
|
|
if (jcnt == 0)
|
|
continue;
|
|
|
|
if (unlikely (jcnt > (1U << j)))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
/* There are JCNT values that have this length, the values
|
|
starting from START[j] continuing through NEXT[VAL]. Those
|
|
values are assigned consecutive values starting at CODE. */
|
|
|
|
val = start[j];
|
|
for (i = 0; i < jcnt; ++i)
|
|
{
|
|
uint16_t tval;
|
|
size_t ind;
|
|
unsigned int incr;
|
|
|
|
/* In the compressed bit stream, the value VAL is encoded as
|
|
J bits with the value C. */
|
|
|
|
if (unlikely ((val & ~HUFFMAN_VALUE_MASK) != 0))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
tval = val | ((j - 1) << HUFFMAN_BITS_SHIFT);
|
|
|
|
/* The table lookup uses 8 bits. If J is less than 8, we
|
|
don't know what the other bits will be. We need to fill
|
|
in all possibilities in the table. Since the Huffman
|
|
code is unambiguous, those entries can't be used for any
|
|
other code. */
|
|
|
|
for (ind = code; ind < 0x100; ind += 1 << j)
|
|
{
|
|
if (unlikely (table[ind] != 0))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
table[ind] = tval;
|
|
}
|
|
|
|
/* Advance to the next value with this length. */
|
|
if (i + 1 < jcnt)
|
|
val = next[val];
|
|
|
|
/* The Huffman codes are stored in the bitstream with the
|
|
most significant bit first, as is required to make them
|
|
unambiguous. The effect is that when we read them from
|
|
the bitstream we see the bit sequence in reverse order:
|
|
the most significant bit of the Huffman code is the least
|
|
significant bit of the value we read from the bitstream.
|
|
That means that to make our table lookups work, we need
|
|
to reverse the bits of CODE. Since reversing bits is
|
|
tedious and in general requires using a table, we instead
|
|
increment CODE in reverse order. That is, if the number
|
|
of bits we are currently using, here named J, is 3, we
|
|
count as 000, 100, 010, 110, 001, 101, 011, 111, which is
|
|
to say the numbers from 0 to 7 but with the bits
|
|
reversed. Going to more bits, aka incrementing J,
|
|
effectively just adds more zero bits as the beginning,
|
|
and as such does not change the numeric value of CODE.
|
|
|
|
To increment CODE of length J in reverse order, find the
|
|
most significant zero bit and set it to one while
|
|
clearing all higher bits. In other words, add 1 modulo
|
|
2^J, only reversed. */
|
|
|
|
incr = 1U << (j - 1);
|
|
while ((code & incr) != 0)
|
|
incr >>= 1;
|
|
if (incr == 0)
|
|
code = 0;
|
|
else
|
|
{
|
|
code &= incr - 1;
|
|
code += incr;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Handle the values that require a secondary table. */
|
|
|
|
/* Set FIRSTCODE, the number at which the codes start, for each
|
|
length. */
|
|
|
|
for (j = 9; j < 16; j++)
|
|
{
|
|
unsigned int jcnt;
|
|
unsigned int k;
|
|
|
|
jcnt = count[j];
|
|
if (jcnt == 0)
|
|
continue;
|
|
|
|
/* There are JCNT values that have this length, the values
|
|
starting from START[j]. Those values are assigned
|
|
consecutive values starting at CODE. */
|
|
|
|
firstcode[j - 9] = code;
|
|
|
|
/* Reverse add JCNT to CODE modulo 2^J. */
|
|
for (k = 0; k < j; ++k)
|
|
{
|
|
if ((jcnt & (1U << k)) != 0)
|
|
{
|
|
unsigned int m;
|
|
unsigned int bit;
|
|
|
|
bit = 1U << (j - k - 1);
|
|
for (m = 0; m < j - k; ++m, bit >>= 1)
|
|
{
|
|
if ((code & bit) == 0)
|
|
{
|
|
code += bit;
|
|
break;
|
|
}
|
|
code &= ~bit;
|
|
}
|
|
jcnt &= ~(1U << k);
|
|
}
|
|
}
|
|
if (unlikely (jcnt != 0))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* For J from 9 to 15, inclusive, we store COUNT[J] consecutive
|
|
values starting at START[J] with consecutive codes starting at
|
|
FIRSTCODE[J - 9]. In the primary table we need to point to the
|
|
secondary table, and the secondary table will be indexed by J - 9
|
|
bits. We count down from 15 so that we install the larger
|
|
secondary tables first, as the smaller ones may be embedded in
|
|
the larger ones. */
|
|
|
|
next_secondary = 0; /* Index of next secondary table (after primary). */
|
|
for (j = 15; j >= 9; j--)
|
|
{
|
|
unsigned int jcnt;
|
|
unsigned int val;
|
|
size_t primary; /* Current primary index. */
|
|
size_t secondary; /* Offset to current secondary table. */
|
|
size_t secondary_bits; /* Bit size of current secondary table. */
|
|
|
|
jcnt = count[j];
|
|
if (jcnt == 0)
|
|
continue;
|
|
|
|
val = start[j];
|
|
code = firstcode[j - 9];
|
|
primary = 0x100;
|
|
secondary = 0;
|
|
secondary_bits = 0;
|
|
for (i = 0; i < jcnt; ++i)
|
|
{
|
|
uint16_t tval;
|
|
size_t ind;
|
|
unsigned int incr;
|
|
|
|
if ((code & 0xff) != primary)
|
|
{
|
|
uint16_t tprimary;
|
|
|
|
/* Fill in a new primary table entry. */
|
|
|
|
primary = code & 0xff;
|
|
|
|
tprimary = table[primary];
|
|
if (tprimary == 0)
|
|
{
|
|
/* Start a new secondary table. */
|
|
|
|
if (unlikely ((next_secondary & HUFFMAN_VALUE_MASK)
|
|
!= next_secondary))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
secondary = next_secondary;
|
|
secondary_bits = j - 8;
|
|
next_secondary += 1 << secondary_bits;
|
|
table[primary] = (secondary
|
|
+ ((j - 8) << HUFFMAN_BITS_SHIFT)
|
|
+ (1U << HUFFMAN_SECONDARY_SHIFT));
|
|
}
|
|
else
|
|
{
|
|
/* There is an existing entry. It had better be a
|
|
secondary table with enough bits. */
|
|
if (unlikely ((tprimary & (1U << HUFFMAN_SECONDARY_SHIFT))
|
|
== 0))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
secondary = tprimary & HUFFMAN_VALUE_MASK;
|
|
secondary_bits = ((tprimary >> HUFFMAN_BITS_SHIFT)
|
|
& HUFFMAN_BITS_MASK);
|
|
if (unlikely (secondary_bits < j - 8))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Fill in secondary table entries. */
|
|
|
|
tval = val | ((j - 8) << HUFFMAN_BITS_SHIFT);
|
|
|
|
for (ind = code >> 8;
|
|
ind < (1U << secondary_bits);
|
|
ind += 1U << (j - 8))
|
|
{
|
|
if (unlikely (table[secondary + 0x100 + ind] != 0))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
table[secondary + 0x100 + ind] = tval;
|
|
}
|
|
|
|
if (i + 1 < jcnt)
|
|
val = next[val];
|
|
|
|
incr = 1U << (j - 1);
|
|
while ((code & incr) != 0)
|
|
incr >>= 1;
|
|
if (incr == 0)
|
|
code = 0;
|
|
else
|
|
{
|
|
code &= incr - 1;
|
|
code += incr;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef BACKTRACE_GENERATE_FIXED_HUFFMAN_TABLE
|
|
final_next_secondary = next_secondary;
|
|
#endif
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifdef BACKTRACE_GENERATE_FIXED_HUFFMAN_TABLE
|
|
|
|
/* Used to generate the fixed Huffman table for block type 1. */
|
|
|
|
#include <stdio.h>
|
|
|
|
static uint16_t table[ZDEBUG_TABLE_SIZE];
|
|
static unsigned char codes[288];
|
|
|
|
int
|
|
main ()
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i <= 143; ++i)
|
|
codes[i] = 8;
|
|
for (i = 144; i <= 255; ++i)
|
|
codes[i] = 9;
|
|
for (i = 256; i <= 279; ++i)
|
|
codes[i] = 7;
|
|
for (i = 280; i <= 287; ++i)
|
|
codes[i] = 8;
|
|
if (!elf_zlib_inflate_table (&codes[0], 288, &table[0], &table[0]))
|
|
{
|
|
fprintf (stderr, "elf_zlib_inflate_table failed\n");
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
|
|
printf ("static const uint16_t elf_zlib_default_table[%#zx] =\n",
|
|
final_next_secondary + 0x100);
|
|
printf ("{\n");
|
|
for (i = 0; i < final_next_secondary + 0x100; i += 8)
|
|
{
|
|
size_t j;
|
|
|
|
printf (" ");
|
|
for (j = i; j < final_next_secondary + 0x100 && j < i + 8; ++j)
|
|
printf (" %#x,", table[j]);
|
|
printf ("\n");
|
|
}
|
|
printf ("};\n");
|
|
printf ("\n");
|
|
|
|
for (i = 0; i < 32; ++i)
|
|
codes[i] = 5;
|
|
if (!elf_zlib_inflate_table (&codes[0], 32, &table[0], &table[0]))
|
|
{
|
|
fprintf (stderr, "elf_zlib_inflate_table failed\n");
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
|
|
printf ("static const uint16_t elf_zlib_default_dist_table[%#zx] =\n",
|
|
final_next_secondary + 0x100);
|
|
printf ("{\n");
|
|
for (i = 0; i < final_next_secondary + 0x100; i += 8)
|
|
{
|
|
size_t j;
|
|
|
|
printf (" ");
|
|
for (j = i; j < final_next_secondary + 0x100 && j < i + 8; ++j)
|
|
printf (" %#x,", table[j]);
|
|
printf ("\n");
|
|
}
|
|
printf ("};\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* The fixed tables generated by the #ifdef'ed out main function
|
|
above. */
|
|
|
|
static const uint16_t elf_zlib_default_table[0x170] =
|
|
{
|
|
0xd00, 0xe50, 0xe10, 0xf18, 0xd10, 0xe70, 0xe30, 0x1230,
|
|
0xd08, 0xe60, 0xe20, 0x1210, 0xe00, 0xe80, 0xe40, 0x1250,
|
|
0xd04, 0xe58, 0xe18, 0x1200, 0xd14, 0xe78, 0xe38, 0x1240,
|
|
0xd0c, 0xe68, 0xe28, 0x1220, 0xe08, 0xe88, 0xe48, 0x1260,
|
|
0xd02, 0xe54, 0xe14, 0xf1c, 0xd12, 0xe74, 0xe34, 0x1238,
|
|
0xd0a, 0xe64, 0xe24, 0x1218, 0xe04, 0xe84, 0xe44, 0x1258,
|
|
0xd06, 0xe5c, 0xe1c, 0x1208, 0xd16, 0xe7c, 0xe3c, 0x1248,
|
|
0xd0e, 0xe6c, 0xe2c, 0x1228, 0xe0c, 0xe8c, 0xe4c, 0x1268,
|
|
0xd01, 0xe52, 0xe12, 0xf1a, 0xd11, 0xe72, 0xe32, 0x1234,
|
|
0xd09, 0xe62, 0xe22, 0x1214, 0xe02, 0xe82, 0xe42, 0x1254,
|
|
0xd05, 0xe5a, 0xe1a, 0x1204, 0xd15, 0xe7a, 0xe3a, 0x1244,
|
|
0xd0d, 0xe6a, 0xe2a, 0x1224, 0xe0a, 0xe8a, 0xe4a, 0x1264,
|
|
0xd03, 0xe56, 0xe16, 0xf1e, 0xd13, 0xe76, 0xe36, 0x123c,
|
|
0xd0b, 0xe66, 0xe26, 0x121c, 0xe06, 0xe86, 0xe46, 0x125c,
|
|
0xd07, 0xe5e, 0xe1e, 0x120c, 0xd17, 0xe7e, 0xe3e, 0x124c,
|
|
0xd0f, 0xe6e, 0xe2e, 0x122c, 0xe0e, 0xe8e, 0xe4e, 0x126c,
|
|
0xd00, 0xe51, 0xe11, 0xf19, 0xd10, 0xe71, 0xe31, 0x1232,
|
|
0xd08, 0xe61, 0xe21, 0x1212, 0xe01, 0xe81, 0xe41, 0x1252,
|
|
0xd04, 0xe59, 0xe19, 0x1202, 0xd14, 0xe79, 0xe39, 0x1242,
|
|
0xd0c, 0xe69, 0xe29, 0x1222, 0xe09, 0xe89, 0xe49, 0x1262,
|
|
0xd02, 0xe55, 0xe15, 0xf1d, 0xd12, 0xe75, 0xe35, 0x123a,
|
|
0xd0a, 0xe65, 0xe25, 0x121a, 0xe05, 0xe85, 0xe45, 0x125a,
|
|
0xd06, 0xe5d, 0xe1d, 0x120a, 0xd16, 0xe7d, 0xe3d, 0x124a,
|
|
0xd0e, 0xe6d, 0xe2d, 0x122a, 0xe0d, 0xe8d, 0xe4d, 0x126a,
|
|
0xd01, 0xe53, 0xe13, 0xf1b, 0xd11, 0xe73, 0xe33, 0x1236,
|
|
0xd09, 0xe63, 0xe23, 0x1216, 0xe03, 0xe83, 0xe43, 0x1256,
|
|
0xd05, 0xe5b, 0xe1b, 0x1206, 0xd15, 0xe7b, 0xe3b, 0x1246,
|
|
0xd0d, 0xe6b, 0xe2b, 0x1226, 0xe0b, 0xe8b, 0xe4b, 0x1266,
|
|
0xd03, 0xe57, 0xe17, 0xf1f, 0xd13, 0xe77, 0xe37, 0x123e,
|
|
0xd0b, 0xe67, 0xe27, 0x121e, 0xe07, 0xe87, 0xe47, 0x125e,
|
|
0xd07, 0xe5f, 0xe1f, 0x120e, 0xd17, 0xe7f, 0xe3f, 0x124e,
|
|
0xd0f, 0xe6f, 0xe2f, 0x122e, 0xe0f, 0xe8f, 0xe4f, 0x126e,
|
|
0x290, 0x291, 0x292, 0x293, 0x294, 0x295, 0x296, 0x297,
|
|
0x298, 0x299, 0x29a, 0x29b, 0x29c, 0x29d, 0x29e, 0x29f,
|
|
0x2a0, 0x2a1, 0x2a2, 0x2a3, 0x2a4, 0x2a5, 0x2a6, 0x2a7,
|
|
0x2a8, 0x2a9, 0x2aa, 0x2ab, 0x2ac, 0x2ad, 0x2ae, 0x2af,
|
|
0x2b0, 0x2b1, 0x2b2, 0x2b3, 0x2b4, 0x2b5, 0x2b6, 0x2b7,
|
|
0x2b8, 0x2b9, 0x2ba, 0x2bb, 0x2bc, 0x2bd, 0x2be, 0x2bf,
|
|
0x2c0, 0x2c1, 0x2c2, 0x2c3, 0x2c4, 0x2c5, 0x2c6, 0x2c7,
|
|
0x2c8, 0x2c9, 0x2ca, 0x2cb, 0x2cc, 0x2cd, 0x2ce, 0x2cf,
|
|
0x2d0, 0x2d1, 0x2d2, 0x2d3, 0x2d4, 0x2d5, 0x2d6, 0x2d7,
|
|
0x2d8, 0x2d9, 0x2da, 0x2db, 0x2dc, 0x2dd, 0x2de, 0x2df,
|
|
0x2e0, 0x2e1, 0x2e2, 0x2e3, 0x2e4, 0x2e5, 0x2e6, 0x2e7,
|
|
0x2e8, 0x2e9, 0x2ea, 0x2eb, 0x2ec, 0x2ed, 0x2ee, 0x2ef,
|
|
0x2f0, 0x2f1, 0x2f2, 0x2f3, 0x2f4, 0x2f5, 0x2f6, 0x2f7,
|
|
0x2f8, 0x2f9, 0x2fa, 0x2fb, 0x2fc, 0x2fd, 0x2fe, 0x2ff,
|
|
};
|
|
|
|
static const uint16_t elf_zlib_default_dist_table[0x100] =
|
|
{
|
|
0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c,
|
|
0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e,
|
|
0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d,
|
|
0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f,
|
|
0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c,
|
|
0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e,
|
|
0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d,
|
|
0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f,
|
|
0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c,
|
|
0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e,
|
|
0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d,
|
|
0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f,
|
|
0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c,
|
|
0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e,
|
|
0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d,
|
|
0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f,
|
|
0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c,
|
|
0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e,
|
|
0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d,
|
|
0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f,
|
|
0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c,
|
|
0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e,
|
|
0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d,
|
|
0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f,
|
|
0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c,
|
|
0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e,
|
|
0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d,
|
|
0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f,
|
|
0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c,
|
|
0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e,
|
|
0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d,
|
|
0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f,
|
|
};
|
|
|
|
/* Inflate a zlib stream from PIN/SIN to POUT/SOUT. Return 1 on
|
|
success, 0 on some error parsing the stream. */
|
|
|
|
static int
|
|
elf_zlib_inflate (const unsigned char *pin, size_t sin, uint16_t *zdebug_table,
|
|
unsigned char *pout, size_t sout)
|
|
{
|
|
unsigned char *porigout;
|
|
const unsigned char *pinend;
|
|
unsigned char *poutend;
|
|
|
|
/* We can apparently see multiple zlib streams concatenated
|
|
together, so keep going as long as there is something to read.
|
|
The last 4 bytes are the checksum. */
|
|
porigout = pout;
|
|
pinend = pin + sin;
|
|
poutend = pout + sout;
|
|
while ((pinend - pin) > 4)
|
|
{
|
|
uint64_t val;
|
|
unsigned int bits;
|
|
int last;
|
|
|
|
/* Read the two byte zlib header. */
|
|
|
|
if (unlikely ((pin[0] & 0xf) != 8)) /* 8 is zlib encoding. */
|
|
{
|
|
/* Unknown compression method. */
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
if (unlikely ((pin[0] >> 4) > 7))
|
|
{
|
|
/* Window size too large. Other than this check, we don't
|
|
care about the window size. */
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
if (unlikely ((pin[1] & 0x20) != 0))
|
|
{
|
|
/* Stream expects a predefined dictionary, but we have no
|
|
dictionary. */
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
val = (pin[0] << 8) | pin[1];
|
|
if (unlikely (val % 31 != 0))
|
|
{
|
|
/* Header check failure. */
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
pin += 2;
|
|
|
|
/* Align PIN to a 32-bit boundary. */
|
|
|
|
val = 0;
|
|
bits = 0;
|
|
while ((((uintptr_t) pin) & 3) != 0)
|
|
{
|
|
val |= (uint64_t)*pin << bits;
|
|
bits += 8;
|
|
++pin;
|
|
}
|
|
|
|
/* Read blocks until one is marked last. */
|
|
|
|
last = 0;
|
|
|
|
while (!last)
|
|
{
|
|
unsigned int type;
|
|
const uint16_t *tlit;
|
|
const uint16_t *tdist;
|
|
|
|
if (!elf_zlib_fetch (&pin, pinend, &val, &bits))
|
|
return 0;
|
|
|
|
last = val & 1;
|
|
type = (val >> 1) & 3;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (unlikely (type == 3))
|
|
{
|
|
/* Invalid block type. */
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
if (type == 0)
|
|
{
|
|
uint16_t len;
|
|
uint16_t lenc;
|
|
|
|
/* An uncompressed block. */
|
|
|
|
/* If we've read ahead more than a byte, back up. */
|
|
while (bits > 8)
|
|
{
|
|
--pin;
|
|
bits -= 8;
|
|
}
|
|
|
|
val = 0;
|
|
bits = 0;
|
|
if (unlikely ((pinend - pin) < 4))
|
|
{
|
|
/* Missing length. */
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
len = pin[0] | (pin[1] << 8);
|
|
lenc = pin[2] | (pin[3] << 8);
|
|
pin += 4;
|
|
lenc = ~lenc;
|
|
if (unlikely (len != lenc))
|
|
{
|
|
/* Corrupt data. */
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
if (unlikely (len > (unsigned int) (pinend - pin)
|
|
|| len > (unsigned int) (poutend - pout)))
|
|
{
|
|
/* Not enough space in buffers. */
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
memcpy (pout, pin, len);
|
|
pout += len;
|
|
pin += len;
|
|
|
|
/* Align PIN. */
|
|
while ((((uintptr_t) pin) & 3) != 0)
|
|
{
|
|
val |= (uint64_t)*pin << bits;
|
|
bits += 8;
|
|
++pin;
|
|
}
|
|
|
|
/* Go around to read the next block. */
|
|
continue;
|
|
}
|
|
|
|
if (type == 1)
|
|
{
|
|
tlit = elf_zlib_default_table;
|
|
tdist = elf_zlib_default_dist_table;
|
|
}
|
|
else
|
|
{
|
|
unsigned int nlit;
|
|
unsigned int ndist;
|
|
unsigned int nclen;
|
|
unsigned char codebits[19];
|
|
unsigned char *plenbase;
|
|
unsigned char *plen;
|
|
unsigned char *plenend;
|
|
|
|
/* Read a Huffman encoding table. The various magic
|
|
numbers here are from RFC 1951. */
|
|
|
|
if (!elf_zlib_fetch (&pin, pinend, &val, &bits))
|
|
return 0;
|
|
|
|
nlit = (val & 0x1f) + 257;
|
|
val >>= 5;
|
|
ndist = (val & 0x1f) + 1;
|
|
val >>= 5;
|
|
nclen = (val & 0xf) + 4;
|
|
val >>= 4;
|
|
bits -= 14;
|
|
if (unlikely (nlit > 286 || ndist > 30))
|
|
{
|
|
/* Values out of range. */
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
/* Read and build the table used to compress the
|
|
literal, length, and distance codes. */
|
|
|
|
memset(&codebits[0], 0, 19);
|
|
|
|
/* There are always at least 4 elements in the
|
|
table. */
|
|
|
|
if (!elf_zlib_fetch (&pin, pinend, &val, &bits))
|
|
return 0;
|
|
|
|
codebits[16] = val & 7;
|
|
codebits[17] = (val >> 3) & 7;
|
|
codebits[18] = (val >> 6) & 7;
|
|
codebits[0] = (val >> 9) & 7;
|
|
val >>= 12;
|
|
bits -= 12;
|
|
|
|
if (nclen == 4)
|
|
goto codebitsdone;
|
|
|
|
codebits[8] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 5)
|
|
goto codebitsdone;
|
|
|
|
if (!elf_zlib_fetch (&pin, pinend, &val, &bits))
|
|
return 0;
|
|
|
|
codebits[7] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 6)
|
|
goto codebitsdone;
|
|
|
|
codebits[9] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 7)
|
|
goto codebitsdone;
|
|
|
|
codebits[6] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 8)
|
|
goto codebitsdone;
|
|
|
|
codebits[10] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 9)
|
|
goto codebitsdone;
|
|
|
|
codebits[5] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 10)
|
|
goto codebitsdone;
|
|
|
|
if (!elf_zlib_fetch (&pin, pinend, &val, &bits))
|
|
return 0;
|
|
|
|
codebits[11] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 11)
|
|
goto codebitsdone;
|
|
|
|
codebits[4] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 12)
|
|
goto codebitsdone;
|
|
|
|
codebits[12] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 13)
|
|
goto codebitsdone;
|
|
|
|
codebits[3] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 14)
|
|
goto codebitsdone;
|
|
|
|
codebits[13] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 15)
|
|
goto codebitsdone;
|
|
|
|
if (!elf_zlib_fetch (&pin, pinend, &val, &bits))
|
|
return 0;
|
|
|
|
codebits[2] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 16)
|
|
goto codebitsdone;
|
|
|
|
codebits[14] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 17)
|
|
goto codebitsdone;
|
|
|
|
codebits[1] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
if (nclen == 18)
|
|
goto codebitsdone;
|
|
|
|
codebits[15] = val & 7;
|
|
val >>= 3;
|
|
bits -= 3;
|
|
|
|
codebitsdone:
|
|
|
|
if (!elf_zlib_inflate_table (codebits, 19, zdebug_table,
|
|
zdebug_table))
|
|
return 0;
|
|
|
|
/* Read the compressed bit lengths of the literal,
|
|
length, and distance codes. We have allocated space
|
|
at the end of zdebug_table to hold them. */
|
|
|
|
plenbase = (((unsigned char *) zdebug_table)
|
|
+ ZDEBUG_TABLE_CODELEN_OFFSET);
|
|
plen = plenbase;
|
|
plenend = plen + nlit + ndist;
|
|
while (plen < plenend)
|
|
{
|
|
uint16_t t;
|
|
unsigned int b;
|
|
uint16_t v;
|
|
|
|
if (!elf_zlib_fetch (&pin, pinend, &val, &bits))
|
|
return 0;
|
|
|
|
t = zdebug_table[val & 0xff];
|
|
|
|
/* The compression here uses bit lengths up to 7, so
|
|
a secondary table is never necessary. */
|
|
if (unlikely ((t & (1U << HUFFMAN_SECONDARY_SHIFT)) != 0))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
b = (t >> HUFFMAN_BITS_SHIFT) & HUFFMAN_BITS_MASK;
|
|
val >>= b + 1;
|
|
bits -= b + 1;
|
|
|
|
v = t & HUFFMAN_VALUE_MASK;
|
|
if (v < 16)
|
|
*plen++ = v;
|
|
else if (v == 16)
|
|
{
|
|
unsigned int c;
|
|
unsigned int prev;
|
|
|
|
/* Copy previous entry 3 to 6 times. */
|
|
|
|
if (unlikely (plen == plenbase))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
/* We used up to 7 bits since the last
|
|
elf_zlib_fetch, so we have at least 8 bits
|
|
available here. */
|
|
|
|
c = 3 + (val & 0x3);
|
|
val >>= 2;
|
|
bits -= 2;
|
|
if (unlikely ((unsigned int) (plenend - plen) < c))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
prev = plen[-1];
|
|
switch (c)
|
|
{
|
|
case 6:
|
|
*plen++ = prev;
|
|
/* fallthrough */
|
|
case 5:
|
|
*plen++ = prev;
|
|
/* fallthrough */
|
|
case 4:
|
|
*plen++ = prev;
|
|
}
|
|
*plen++ = prev;
|
|
*plen++ = prev;
|
|
*plen++ = prev;
|
|
}
|
|
else if (v == 17)
|
|
{
|
|
unsigned int c;
|
|
|
|
/* Store zero 3 to 10 times. */
|
|
|
|
/* We used up to 7 bits since the last
|
|
elf_zlib_fetch, so we have at least 8 bits
|
|
available here. */
|
|
|
|
c = 3 + (val & 0x7);
|
|
val >>= 3;
|
|
bits -= 3;
|
|
if (unlikely ((unsigned int) (plenend - plen) < c))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
switch (c)
|
|
{
|
|
case 10:
|
|
*plen++ = 0;
|
|
/* fallthrough */
|
|
case 9:
|
|
*plen++ = 0;
|
|
/* fallthrough */
|
|
case 8:
|
|
*plen++ = 0;
|
|
/* fallthrough */
|
|
case 7:
|
|
*plen++ = 0;
|
|
/* fallthrough */
|
|
case 6:
|
|
*plen++ = 0;
|
|
/* fallthrough */
|
|
case 5:
|
|
*plen++ = 0;
|
|
/* fallthrough */
|
|
case 4:
|
|
*plen++ = 0;
|
|
}
|
|
*plen++ = 0;
|
|
*plen++ = 0;
|
|
*plen++ = 0;
|
|
}
|
|
else if (v == 18)
|
|
{
|
|
unsigned int c;
|
|
|
|
/* Store zero 11 to 138 times. */
|
|
|
|
/* We used up to 7 bits since the last
|
|
elf_zlib_fetch, so we have at least 8 bits
|
|
available here. */
|
|
|
|
c = 11 + (val & 0x7f);
|
|
val >>= 7;
|
|
bits -= 7;
|
|
if (unlikely ((unsigned int) (plenend - plen) < c))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
memset (plen, 0, c);
|
|
plen += c;
|
|
}
|
|
else
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Make sure that the stop code can appear. */
|
|
|
|
plen = plenbase;
|
|
if (unlikely (plen[256] == 0))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
/* Build the decompression tables. */
|
|
|
|
if (!elf_zlib_inflate_table (plen, nlit, zdebug_table,
|
|
zdebug_table))
|
|
return 0;
|
|
if (!elf_zlib_inflate_table (plen + nlit, ndist, zdebug_table,
|
|
zdebug_table + HUFFMAN_TABLE_SIZE))
|
|
return 0;
|
|
tlit = zdebug_table;
|
|
tdist = zdebug_table + HUFFMAN_TABLE_SIZE;
|
|
}
|
|
|
|
/* Inflate values until the end of the block. This is the
|
|
main loop of the inflation code. */
|
|
|
|
while (1)
|
|
{
|
|
uint16_t t;
|
|
unsigned int b;
|
|
uint16_t v;
|
|
unsigned int lit;
|
|
|
|
if (!elf_zlib_fetch (&pin, pinend, &val, &bits))
|
|
return 0;
|
|
|
|
t = tlit[val & 0xff];
|
|
b = (t >> HUFFMAN_BITS_SHIFT) & HUFFMAN_BITS_MASK;
|
|
v = t & HUFFMAN_VALUE_MASK;
|
|
|
|
if ((t & (1U << HUFFMAN_SECONDARY_SHIFT)) == 0)
|
|
{
|
|
lit = v;
|
|
val >>= b + 1;
|
|
bits -= b + 1;
|
|
}
|
|
else
|
|
{
|
|
t = tlit[v + 0x100 + ((val >> 8) & ((1U << b) - 1))];
|
|
b = (t >> HUFFMAN_BITS_SHIFT) & HUFFMAN_BITS_MASK;
|
|
lit = t & HUFFMAN_VALUE_MASK;
|
|
val >>= b + 8;
|
|
bits -= b + 8;
|
|
}
|
|
|
|
if (lit < 256)
|
|
{
|
|
if (unlikely (pout == poutend))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
*pout++ = lit;
|
|
|
|
/* We will need to write the next byte soon. We ask
|
|
for high temporal locality because we will write
|
|
to the whole cache line soon. */
|
|
__builtin_prefetch (pout, 1, 3);
|
|
}
|
|
else if (lit == 256)
|
|
{
|
|
/* The end of the block. */
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
unsigned int dist;
|
|
unsigned int len;
|
|
|
|
/* Convert lit into a length. */
|
|
|
|
if (lit < 265)
|
|
len = lit - 257 + 3;
|
|
else if (lit == 285)
|
|
len = 258;
|
|
else if (unlikely (lit > 285))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
unsigned int extra;
|
|
|
|
if (!elf_zlib_fetch (&pin, pinend, &val, &bits))
|
|
return 0;
|
|
|
|
/* This is an expression for the table of length
|
|
codes in RFC 1951 3.2.5. */
|
|
lit -= 265;
|
|
extra = (lit >> 2) + 1;
|
|
len = (lit & 3) << extra;
|
|
len += 11;
|
|
len += ((1U << (extra - 1)) - 1) << 3;
|
|
len += val & ((1U << extra) - 1);
|
|
val >>= extra;
|
|
bits -= extra;
|
|
}
|
|
|
|
if (!elf_zlib_fetch (&pin, pinend, &val, &bits))
|
|
return 0;
|
|
|
|
t = tdist[val & 0xff];
|
|
b = (t >> HUFFMAN_BITS_SHIFT) & HUFFMAN_BITS_MASK;
|
|
v = t & HUFFMAN_VALUE_MASK;
|
|
|
|
if ((t & (1U << HUFFMAN_SECONDARY_SHIFT)) == 0)
|
|
{
|
|
dist = v;
|
|
val >>= b + 1;
|
|
bits -= b + 1;
|
|
}
|
|
else
|
|
{
|
|
t = tdist[v + 0x100 + ((val >> 8) & ((1U << b) - 1))];
|
|
b = (t >> HUFFMAN_BITS_SHIFT) & HUFFMAN_BITS_MASK;
|
|
dist = t & HUFFMAN_VALUE_MASK;
|
|
val >>= b + 8;
|
|
bits -= b + 8;
|
|
}
|
|
|
|
/* Convert dist to a distance. */
|
|
|
|
if (dist == 0)
|
|
{
|
|
/* A distance of 1. A common case, meaning
|
|
repeat the last character LEN times. */
|
|
|
|
if (unlikely (pout == porigout))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
if (unlikely ((unsigned int) (poutend - pout) < len))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
memset (pout, pout[-1], len);
|
|
pout += len;
|
|
}
|
|
else if (unlikely (dist > 29))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
if (dist < 4)
|
|
dist = dist + 1;
|
|
else
|
|
{
|
|
unsigned int extra;
|
|
|
|
if (!elf_zlib_fetch (&pin, pinend, &val, &bits))
|
|
return 0;
|
|
|
|
/* This is an expression for the table of
|
|
distance codes in RFC 1951 3.2.5. */
|
|
dist -= 4;
|
|
extra = (dist >> 1) + 1;
|
|
dist = (dist & 1) << extra;
|
|
dist += 5;
|
|
dist += ((1U << (extra - 1)) - 1) << 2;
|
|
dist += val & ((1U << extra) - 1);
|
|
val >>= extra;
|
|
bits -= extra;
|
|
}
|
|
|
|
/* Go back dist bytes, and copy len bytes from
|
|
there. */
|
|
|
|
if (unlikely ((unsigned int) (pout - porigout) < dist))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
if (unlikely ((unsigned int) (poutend - pout) < len))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
if (dist >= len)
|
|
{
|
|
memcpy (pout, pout - dist, len);
|
|
pout += len;
|
|
}
|
|
else
|
|
{
|
|
while (len > 0)
|
|
{
|
|
unsigned int copy;
|
|
|
|
copy = len < dist ? len : dist;
|
|
memcpy (pout, pout - dist, copy);
|
|
len -= copy;
|
|
pout += copy;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* We should have filled the output buffer. */
|
|
if (unlikely (pout != poutend))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Verify the zlib checksum. The checksum is in the 4 bytes at
|
|
CHECKBYTES, and the uncompressed data is at UNCOMPRESSED /
|
|
UNCOMPRESSED_SIZE. Returns 1 on success, 0 on failure. */
|
|
|
|
static int
|
|
elf_zlib_verify_checksum (const unsigned char *checkbytes,
|
|
const unsigned char *uncompressed,
|
|
size_t uncompressed_size)
|
|
{
|
|
unsigned int i;
|
|
unsigned int cksum;
|
|
const unsigned char *p;
|
|
uint32_t s1;
|
|
uint32_t s2;
|
|
size_t hsz;
|
|
|
|
cksum = 0;
|
|
for (i = 0; i < 4; i++)
|
|
cksum = (cksum << 8) | checkbytes[i];
|
|
|
|
s1 = 1;
|
|
s2 = 0;
|
|
|
|
/* Minimize modulo operations. */
|
|
|
|
p = uncompressed;
|
|
hsz = uncompressed_size;
|
|
while (hsz >= 5552)
|
|
{
|
|
for (i = 0; i < 5552; i += 16)
|
|
{
|
|
/* Manually unroll loop 16 times. */
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
}
|
|
hsz -= 5552;
|
|
s1 %= 65521;
|
|
s2 %= 65521;
|
|
}
|
|
|
|
while (hsz >= 16)
|
|
{
|
|
/* Manually unroll loop 16 times. */
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
|
|
hsz -= 16;
|
|
}
|
|
|
|
for (i = 0; i < hsz; ++i)
|
|
{
|
|
s1 = s1 + *p++;
|
|
s2 = s2 + s1;
|
|
}
|
|
|
|
s1 %= 65521;
|
|
s2 %= 65521;
|
|
|
|
if (unlikely ((s2 << 16) + s1 != cksum))
|
|
{
|
|
elf_zlib_failed ();
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Inflate a zlib stream from PIN/SIN to POUT/SOUT, and verify the
|
|
checksum. Return 1 on success, 0 on error. */
|
|
|
|
static int
|
|
elf_zlib_inflate_and_verify (const unsigned char *pin, size_t sin,
|
|
uint16_t *zdebug_table, unsigned char *pout,
|
|
size_t sout)
|
|
{
|
|
if (!elf_zlib_inflate (pin, sin, zdebug_table, pout, sout))
|
|
return 0;
|
|
if (!elf_zlib_verify_checksum (pin + sin - 4, pout, sout))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/* Uncompress the old compressed debug format, the one emitted by
|
|
--compress-debug-sections=zlib-gnu. The compressed data is in
|
|
COMPRESSED / COMPRESSED_SIZE, and the function writes to
|
|
*UNCOMPRESSED / *UNCOMPRESSED_SIZE. ZDEBUG_TABLE is work space to
|
|
hold Huffman tables. Returns 0 on error, 1 on successful
|
|
decompression or if something goes wrong. In general we try to
|
|
carry on, by returning 1, even if we can't decompress. */
|
|
|
|
static int
|
|
elf_uncompress_zdebug (struct backtrace_state *state,
|
|
const unsigned char *compressed, size_t compressed_size,
|
|
uint16_t *zdebug_table,
|
|
backtrace_error_callback error_callback, void *data,
|
|
unsigned char **uncompressed, size_t *uncompressed_size)
|
|
{
|
|
size_t sz;
|
|
size_t i;
|
|
unsigned char *po;
|
|
|
|
*uncompressed = NULL;
|
|
*uncompressed_size = 0;
|
|
|
|
/* The format starts with the four bytes ZLIB, followed by the 8
|
|
byte length of the uncompressed data in big-endian order,
|
|
followed by a zlib stream. */
|
|
|
|
if (compressed_size < 12 || memcmp (compressed, "ZLIB", 4) != 0)
|
|
return 1;
|
|
|
|
sz = 0;
|
|
for (i = 0; i < 8; i++)
|
|
sz = (sz << 8) | compressed[i + 4];
|
|
|
|
if (*uncompressed != NULL && *uncompressed_size >= sz)
|
|
po = *uncompressed;
|
|
else
|
|
{
|
|
po = (unsigned char *) backtrace_alloc (state, sz, error_callback, data);
|
|
if (po == NULL)
|
|
return 0;
|
|
}
|
|
|
|
if (!elf_zlib_inflate_and_verify (compressed + 12, compressed_size - 12,
|
|
zdebug_table, po, sz))
|
|
return 1;
|
|
|
|
*uncompressed = po;
|
|
*uncompressed_size = sz;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Uncompress the new compressed debug format, the official standard
|
|
ELF approach emitted by --compress-debug-sections=zlib-gabi. The
|
|
compressed data is in COMPRESSED / COMPRESSED_SIZE, and the
|
|
function writes to *UNCOMPRESSED / *UNCOMPRESSED_SIZE.
|
|
ZDEBUG_TABLE is work space as for elf_uncompress_zdebug. Returns 0
|
|
on error, 1 on successful decompression or if something goes wrong.
|
|
In general we try to carry on, by returning 1, even if we can't
|
|
decompress. */
|
|
|
|
static int
|
|
elf_uncompress_chdr (struct backtrace_state *state,
|
|
const unsigned char *compressed, size_t compressed_size,
|
|
uint16_t *zdebug_table,
|
|
backtrace_error_callback error_callback, void *data,
|
|
unsigned char **uncompressed, size_t *uncompressed_size)
|
|
{
|
|
const b_elf_chdr *chdr;
|
|
unsigned char *po;
|
|
|
|
*uncompressed = NULL;
|
|
*uncompressed_size = 0;
|
|
|
|
/* The format starts with an ELF compression header. */
|
|
if (compressed_size < sizeof (b_elf_chdr))
|
|
return 1;
|
|
|
|
chdr = (const b_elf_chdr *) compressed;
|
|
|
|
if (chdr->ch_type != ELFCOMPRESS_ZLIB)
|
|
{
|
|
/* Unsupported compression algorithm. */
|
|
return 1;
|
|
}
|
|
|
|
if (*uncompressed != NULL && *uncompressed_size >= chdr->ch_size)
|
|
po = *uncompressed;
|
|
else
|
|
{
|
|
po = (unsigned char *) backtrace_alloc (state, chdr->ch_size,
|
|
error_callback, data);
|
|
if (po == NULL)
|
|
return 0;
|
|
}
|
|
|
|
if (!elf_zlib_inflate_and_verify (compressed + sizeof (b_elf_chdr),
|
|
compressed_size - sizeof (b_elf_chdr),
|
|
zdebug_table, po, chdr->ch_size))
|
|
return 1;
|
|
|
|
*uncompressed = po;
|
|
*uncompressed_size = chdr->ch_size;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* This function is a hook for testing the zlib support. It is only
|
|
used by tests. */
|
|
|
|
int
|
|
backtrace_uncompress_zdebug (struct backtrace_state *state,
|
|
const unsigned char *compressed,
|
|
size_t compressed_size,
|
|
backtrace_error_callback error_callback,
|
|
void *data, unsigned char **uncompressed,
|
|
size_t *uncompressed_size)
|
|
{
|
|
uint16_t *zdebug_table;
|
|
int ret;
|
|
|
|
zdebug_table = ((uint16_t *) backtrace_alloc (state, ZDEBUG_TABLE_SIZE,
|
|
error_callback, data));
|
|
if (zdebug_table == NULL)
|
|
return 0;
|
|
ret = elf_uncompress_zdebug (state, compressed, compressed_size,
|
|
zdebug_table, error_callback, data,
|
|
uncompressed, uncompressed_size);
|
|
backtrace_free (state, zdebug_table, ZDEBUG_TABLE_SIZE,
|
|
error_callback, data);
|
|
return ret;
|
|
}
|
|
|
|
/* Add the backtrace data for one ELF file. Returns 1 on success,
|
|
0 on failure (in both cases descriptor is closed) or -1 if exe
|
|
is non-zero and the ELF file is ET_DYN, which tells the caller that
|
|
elf_add will need to be called on the descriptor again after
|
|
base_address is determined. */
|
|
|
|
static int
|
|
elf_add (struct backtrace_state *state, const char *filename, int descriptor,
|
|
uintptr_t base_address, backtrace_error_callback error_callback,
|
|
void *data, fileline *fileline_fn, int *found_sym, int *found_dwarf,
|
|
struct dwarf_data **fileline_entry, int exe, int debuginfo,
|
|
const char *with_buildid_data, uint32_t with_buildid_size)
|
|
{
|
|
struct backtrace_view ehdr_view;
|
|
b_elf_ehdr ehdr;
|
|
off_t shoff;
|
|
unsigned int shnum;
|
|
unsigned int shstrndx;
|
|
struct backtrace_view shdrs_view;
|
|
int shdrs_view_valid;
|
|
const b_elf_shdr *shdrs;
|
|
const b_elf_shdr *shstrhdr;
|
|
size_t shstr_size;
|
|
off_t shstr_off;
|
|
struct backtrace_view names_view;
|
|
int names_view_valid;
|
|
const char *names;
|
|
unsigned int symtab_shndx;
|
|
unsigned int dynsym_shndx;
|
|
unsigned int i;
|
|
struct debug_section_info sections[DEBUG_MAX];
|
|
struct debug_section_info zsections[DEBUG_MAX];
|
|
struct backtrace_view symtab_view;
|
|
int symtab_view_valid;
|
|
struct backtrace_view strtab_view;
|
|
int strtab_view_valid;
|
|
struct backtrace_view buildid_view;
|
|
int buildid_view_valid;
|
|
const char *buildid_data;
|
|
uint32_t buildid_size;
|
|
struct backtrace_view debuglink_view;
|
|
int debuglink_view_valid;
|
|
const char *debuglink_name;
|
|
uint32_t debuglink_crc;
|
|
struct backtrace_view debugaltlink_view;
|
|
int debugaltlink_view_valid;
|
|
const char *debugaltlink_name;
|
|
const char *debugaltlink_buildid_data;
|
|
uint32_t debugaltlink_buildid_size;
|
|
off_t min_offset;
|
|
off_t max_offset;
|
|
struct backtrace_view debug_view;
|
|
int debug_view_valid;
|
|
unsigned int using_debug_view;
|
|
uint16_t *zdebug_table;
|
|
struct elf_ppc64_opd_data opd_data, *opd;
|
|
struct dwarf_sections dwarf_sections;
|
|
|
|
if (!debuginfo)
|
|
{
|
|
*found_sym = 0;
|
|
*found_dwarf = 0;
|
|
}
|
|
|
|
shdrs_view_valid = 0;
|
|
names_view_valid = 0;
|
|
symtab_view_valid = 0;
|
|
strtab_view_valid = 0;
|
|
buildid_view_valid = 0;
|
|
buildid_data = NULL;
|
|
buildid_size = 0;
|
|
debuglink_view_valid = 0;
|
|
debuglink_name = NULL;
|
|
debuglink_crc = 0;
|
|
debugaltlink_view_valid = 0;
|
|
debugaltlink_name = NULL;
|
|
debugaltlink_buildid_data = NULL;
|
|
debugaltlink_buildid_size = 0;
|
|
debug_view_valid = 0;
|
|
opd = NULL;
|
|
|
|
if (!backtrace_get_view (state, descriptor, 0, sizeof ehdr, error_callback,
|
|
data, &ehdr_view))
|
|
goto fail;
|
|
|
|
memcpy (&ehdr, ehdr_view.data, sizeof ehdr);
|
|
|
|
backtrace_release_view (state, &ehdr_view, error_callback, data);
|
|
|
|
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|
|
|| ehdr.e_ident[EI_MAG1] != ELFMAG1
|
|
|| ehdr.e_ident[EI_MAG2] != ELFMAG2
|
|
|| ehdr.e_ident[EI_MAG3] != ELFMAG3)
|
|
{
|
|
error_callback (data, "executable file is not ELF", 0);
|
|
goto fail;
|
|
}
|
|
if (ehdr.e_ident[EI_VERSION] != EV_CURRENT)
|
|
{
|
|
error_callback (data, "executable file is unrecognized ELF version", 0);
|
|
goto fail;
|
|
}
|
|
|
|
#if BACKTRACE_ELF_SIZE == 32
|
|
#define BACKTRACE_ELFCLASS ELFCLASS32
|
|
#else
|
|
#define BACKTRACE_ELFCLASS ELFCLASS64
|
|
#endif
|
|
|
|
if (ehdr.e_ident[EI_CLASS] != BACKTRACE_ELFCLASS)
|
|
{
|
|
error_callback (data, "executable file is unexpected ELF class", 0);
|
|
goto fail;
|
|
}
|
|
|
|
if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB
|
|
&& ehdr.e_ident[EI_DATA] != ELFDATA2MSB)
|
|
{
|
|
error_callback (data, "executable file has unknown endianness", 0);
|
|
goto fail;
|
|
}
|
|
|
|
/* If the executable is ET_DYN, it is either a PIE, or we are running
|
|
directly a shared library with .interp. We need to wait for
|
|
dl_iterate_phdr in that case to determine the actual base_address. */
|
|
if (exe && ehdr.e_type == ET_DYN)
|
|
return -1;
|
|
|
|
shoff = ehdr.e_shoff;
|
|
shnum = ehdr.e_shnum;
|
|
shstrndx = ehdr.e_shstrndx;
|
|
|
|
if ((shnum == 0 || shstrndx == SHN_XINDEX)
|
|
&& shoff != 0)
|
|
{
|
|
struct backtrace_view shdr_view;
|
|
const b_elf_shdr *shdr;
|
|
|
|
if (!backtrace_get_view (state, descriptor, shoff, sizeof shdr,
|
|
error_callback, data, &shdr_view))
|
|
goto fail;
|
|
|
|
shdr = (const b_elf_shdr *) shdr_view.data;
|
|
|
|
if (shnum == 0)
|
|
shnum = shdr->sh_size;
|
|
|
|
if (shstrndx == SHN_XINDEX)
|
|
{
|
|
shstrndx = shdr->sh_link;
|
|
|
|
/* Versions of the GNU binutils between 2.12 and 2.18 did
|
|
not handle objects with more than SHN_LORESERVE sections
|
|
correctly. All large section indexes were offset by
|
|
0x100. There is more information at
|
|
http://sourceware.org/bugzilla/show_bug.cgi?id-5900 .
|
|
Fortunately these object files are easy to detect, as the
|
|
GNU binutils always put the section header string table
|
|
near the end of the list of sections. Thus if the
|
|
section header string table index is larger than the
|
|
number of sections, then we know we have to subtract
|
|
0x100 to get the real section index. */
|
|
if (shstrndx >= shnum && shstrndx >= SHN_LORESERVE + 0x100)
|
|
shstrndx -= 0x100;
|
|
}
|
|
|
|
backtrace_release_view (state, &shdr_view, error_callback, data);
|
|
}
|
|
|
|
/* To translate PC to file/line when using DWARF, we need to find
|
|
the .debug_info and .debug_line sections. */
|
|
|
|
/* Read the section headers, skipping the first one. */
|
|
|
|
if (!backtrace_get_view (state, descriptor, shoff + sizeof (b_elf_shdr),
|
|
(shnum - 1) * sizeof (b_elf_shdr),
|
|
error_callback, data, &shdrs_view))
|
|
goto fail;
|
|
shdrs_view_valid = 1;
|
|
shdrs = (const b_elf_shdr *) shdrs_view.data;
|
|
|
|
/* Read the section names. */
|
|
|
|
shstrhdr = &shdrs[shstrndx - 1];
|
|
shstr_size = shstrhdr->sh_size;
|
|
shstr_off = shstrhdr->sh_offset;
|
|
|
|
if (!backtrace_get_view (state, descriptor, shstr_off, shstrhdr->sh_size,
|
|
error_callback, data, &names_view))
|
|
goto fail;
|
|
names_view_valid = 1;
|
|
names = (const char *) names_view.data;
|
|
|
|
symtab_shndx = 0;
|
|
dynsym_shndx = 0;
|
|
|
|
memset (sections, 0, sizeof sections);
|
|
memset (zsections, 0, sizeof zsections);
|
|
|
|
/* Look for the symbol table. */
|
|
for (i = 1; i < shnum; ++i)
|
|
{
|
|
const b_elf_shdr *shdr;
|
|
unsigned int sh_name;
|
|
const char *name;
|
|
int j;
|
|
|
|
shdr = &shdrs[i - 1];
|
|
|
|
if (shdr->sh_type == SHT_SYMTAB)
|
|
symtab_shndx = i;
|
|
else if (shdr->sh_type == SHT_DYNSYM)
|
|
dynsym_shndx = i;
|
|
|
|
sh_name = shdr->sh_name;
|
|
if (sh_name >= shstr_size)
|
|
{
|
|
error_callback (data, "ELF section name out of range", 0);
|
|
goto fail;
|
|
}
|
|
|
|
name = names + sh_name;
|
|
|
|
for (j = 0; j < (int) DEBUG_MAX; ++j)
|
|
{
|
|
if (strcmp (name, dwarf_section_names[j]) == 0)
|
|
{
|
|
sections[j].offset = shdr->sh_offset;
|
|
sections[j].size = shdr->sh_size;
|
|
sections[j].compressed = (shdr->sh_flags & SHF_COMPRESSED) != 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (name[0] == '.' && name[1] == 'z')
|
|
{
|
|
for (j = 0; j < (int) DEBUG_MAX; ++j)
|
|
{
|
|
if (strcmp (name + 2, dwarf_section_names[j] + 1) == 0)
|
|
{
|
|
zsections[j].offset = shdr->sh_offset;
|
|
zsections[j].size = shdr->sh_size;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Read the build ID if present. This could check for any
|
|
SHT_NOTE section with the right note name and type, but gdb
|
|
looks for a specific section name. */
|
|
if ((!debuginfo || with_buildid_data != NULL)
|
|
&& !buildid_view_valid
|
|
&& strcmp (name, ".note.gnu.build-id") == 0)
|
|
{
|
|
const b_elf_note *note;
|
|
|
|
if (!backtrace_get_view (state, descriptor, shdr->sh_offset,
|
|
shdr->sh_size, error_callback, data,
|
|
&buildid_view))
|
|
goto fail;
|
|
|
|
buildid_view_valid = 1;
|
|
note = (const b_elf_note *) buildid_view.data;
|
|
if (note->type == NT_GNU_BUILD_ID
|
|
&& note->namesz == 4
|
|
&& strncmp (note->name, "GNU", 4) == 0
|
|
&& shdr->sh_size <= 12 + ((note->namesz + 3) & ~ 3) + note->descsz)
|
|
{
|
|
buildid_data = ¬e->name[0] + ((note->namesz + 3) & ~ 3);
|
|
buildid_size = note->descsz;
|
|
}
|
|
|
|
if (with_buildid_size != 0)
|
|
{
|
|
if (buildid_size != with_buildid_size)
|
|
goto fail;
|
|
|
|
if (memcmp (buildid_data, with_buildid_data, buildid_size) != 0)
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* Read the debuglink file if present. */
|
|
if (!debuginfo
|
|
&& !debuglink_view_valid
|
|
&& strcmp (name, ".gnu_debuglink") == 0)
|
|
{
|
|
const char *debuglink_data;
|
|
size_t crc_offset;
|
|
|
|
if (!backtrace_get_view (state, descriptor, shdr->sh_offset,
|
|
shdr->sh_size, error_callback, data,
|
|
&debuglink_view))
|
|
goto fail;
|
|
|
|
debuglink_view_valid = 1;
|
|
debuglink_data = (const char *) debuglink_view.data;
|
|
crc_offset = strnlen (debuglink_data, shdr->sh_size);
|
|
crc_offset = (crc_offset + 3) & ~3;
|
|
if (crc_offset + 4 <= shdr->sh_size)
|
|
{
|
|
debuglink_name = debuglink_data;
|
|
debuglink_crc = *(const uint32_t*)(debuglink_data + crc_offset);
|
|
}
|
|
}
|
|
|
|
if (!debugaltlink_view_valid
|
|
&& strcmp (name, ".gnu_debugaltlink") == 0)
|
|
{
|
|
const char *debugaltlink_data;
|
|
size_t debugaltlink_name_len;
|
|
|
|
if (!backtrace_get_view (state, descriptor, shdr->sh_offset,
|
|
shdr->sh_size, error_callback, data,
|
|
&debugaltlink_view))
|
|
goto fail;
|
|
|
|
debugaltlink_view_valid = 1;
|
|
debugaltlink_data = (const char *) debugaltlink_view.data;
|
|
debugaltlink_name = debugaltlink_data;
|
|
debugaltlink_name_len = strnlen (debugaltlink_data, shdr->sh_size);
|
|
if (debugaltlink_name_len < shdr->sh_size)
|
|
{
|
|
/* Include terminating zero. */
|
|
debugaltlink_name_len += 1;
|
|
|
|
debugaltlink_buildid_data
|
|
= debugaltlink_data + debugaltlink_name_len;
|
|
debugaltlink_buildid_size = shdr->sh_size - debugaltlink_name_len;
|
|
}
|
|
}
|
|
|
|
/* Read the .opd section on PowerPC64 ELFv1. */
|
|
if (ehdr.e_machine == EM_PPC64
|
|
&& (ehdr.e_flags & EF_PPC64_ABI) < 2
|
|
&& shdr->sh_type == SHT_PROGBITS
|
|
&& strcmp (name, ".opd") == 0)
|
|
{
|
|
if (!backtrace_get_view (state, descriptor, shdr->sh_offset,
|
|
shdr->sh_size, error_callback, data,
|
|
&opd_data.view))
|
|
goto fail;
|
|
|
|
opd = &opd_data;
|
|
opd->addr = shdr->sh_addr;
|
|
opd->data = (const char *) opd_data.view.data;
|
|
opd->size = shdr->sh_size;
|
|
}
|
|
}
|
|
|
|
if (symtab_shndx == 0)
|
|
symtab_shndx = dynsym_shndx;
|
|
if (symtab_shndx != 0 && !debuginfo)
|
|
{
|
|
const b_elf_shdr *symtab_shdr;
|
|
unsigned int strtab_shndx;
|
|
const b_elf_shdr *strtab_shdr;
|
|
struct elf_syminfo_data *sdata;
|
|
|
|
symtab_shdr = &shdrs[symtab_shndx - 1];
|
|
strtab_shndx = symtab_shdr->sh_link;
|
|
if (strtab_shndx >= shnum)
|
|
{
|
|
error_callback (data,
|
|
"ELF symbol table strtab link out of range", 0);
|
|
goto fail;
|
|
}
|
|
strtab_shdr = &shdrs[strtab_shndx - 1];
|
|
|
|
if (!backtrace_get_view (state, descriptor, symtab_shdr->sh_offset,
|
|
symtab_shdr->sh_size, error_callback, data,
|
|
&symtab_view))
|
|
goto fail;
|
|
symtab_view_valid = 1;
|
|
|
|
if (!backtrace_get_view (state, descriptor, strtab_shdr->sh_offset,
|
|
strtab_shdr->sh_size, error_callback, data,
|
|
&strtab_view))
|
|
goto fail;
|
|
strtab_view_valid = 1;
|
|
|
|
sdata = ((struct elf_syminfo_data *)
|
|
backtrace_alloc (state, sizeof *sdata, error_callback, data));
|
|
if (sdata == NULL)
|
|
goto fail;
|
|
|
|
if (!elf_initialize_syminfo (state, base_address,
|
|
symtab_view.data, symtab_shdr->sh_size,
|
|
strtab_view.data, strtab_shdr->sh_size,
|
|
error_callback, data, sdata, opd))
|
|
{
|
|
backtrace_free (state, sdata, sizeof *sdata, error_callback, data);
|
|
goto fail;
|
|
}
|
|
|
|
/* We no longer need the symbol table, but we hold on to the
|
|
string table permanently. */
|
|
backtrace_release_view (state, &symtab_view, error_callback, data);
|
|
symtab_view_valid = 0;
|
|
|
|
*found_sym = 1;
|
|
|
|
elf_add_syminfo_data (state, sdata);
|
|
}
|
|
|
|
backtrace_release_view (state, &shdrs_view, error_callback, data);
|
|
shdrs_view_valid = 0;
|
|
backtrace_release_view (state, &names_view, error_callback, data);
|
|
names_view_valid = 0;
|
|
|
|
/* If the debug info is in a separate file, read that one instead. */
|
|
|
|
if (buildid_data != NULL)
|
|
{
|
|
int d;
|
|
|
|
d = elf_open_debugfile_by_buildid (state, buildid_data, buildid_size,
|
|
error_callback, data);
|
|
if (d >= 0)
|
|
{
|
|
int ret;
|
|
|
|
backtrace_release_view (state, &buildid_view, error_callback, data);
|
|
if (debuglink_view_valid)
|
|
backtrace_release_view (state, &debuglink_view, error_callback,
|
|
data);
|
|
if (debugaltlink_view_valid)
|
|
backtrace_release_view (state, &debugaltlink_view, error_callback,
|
|
data);
|
|
ret = elf_add (state, "", d, base_address, error_callback, data,
|
|
fileline_fn, found_sym, found_dwarf, NULL, 0, 1, NULL,
|
|
0);
|
|
if (ret < 0)
|
|
backtrace_close (d, error_callback, data);
|
|
else
|
|
backtrace_close (descriptor, error_callback, data);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (buildid_view_valid)
|
|
{
|
|
backtrace_release_view (state, &buildid_view, error_callback, data);
|
|
buildid_view_valid = 0;
|
|
}
|
|
|
|
if (opd)
|
|
{
|
|
backtrace_release_view (state, &opd->view, error_callback, data);
|
|
opd = NULL;
|
|
}
|
|
|
|
if (debuglink_name != NULL)
|
|
{
|
|
int d;
|
|
|
|
d = elf_open_debugfile_by_debuglink (state, filename, debuglink_name,
|
|
debuglink_crc, error_callback,
|
|
data);
|
|
if (d >= 0)
|
|
{
|
|
int ret;
|
|
|
|
backtrace_release_view (state, &debuglink_view, error_callback,
|
|
data);
|
|
if (debugaltlink_view_valid)
|
|
backtrace_release_view (state, &debugaltlink_view, error_callback,
|
|
data);
|
|
ret = elf_add (state, "", d, base_address, error_callback, data,
|
|
fileline_fn, found_sym, found_dwarf, NULL, 0, 1, NULL,
|
|
0);
|
|
if (ret < 0)
|
|
backtrace_close (d, error_callback, data);
|
|
else
|
|
backtrace_close(descriptor, error_callback, data);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (debuglink_view_valid)
|
|
{
|
|
backtrace_release_view (state, &debuglink_view, error_callback, data);
|
|
debuglink_view_valid = 0;
|
|
}
|
|
|
|
struct dwarf_data *fileline_altlink = NULL;
|
|
if (debugaltlink_name != NULL)
|
|
{
|
|
int d;
|
|
|
|
d = elf_open_debugfile_by_debuglink (state, filename, debugaltlink_name,
|
|
0, error_callback, data);
|
|
if (d >= 0)
|
|
{
|
|
int ret;
|
|
|
|
ret = elf_add (state, filename, d, base_address, error_callback, data,
|
|
fileline_fn, found_sym, found_dwarf, &fileline_altlink,
|
|
0, 1, debugaltlink_buildid_data,
|
|
debugaltlink_buildid_size);
|
|
backtrace_release_view (state, &debugaltlink_view, error_callback,
|
|
data);
|
|
debugaltlink_view_valid = 0;
|
|
if (ret < 0)
|
|
{
|
|
backtrace_close (d, error_callback, data);
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (debugaltlink_view_valid)
|
|
{
|
|
backtrace_release_view (state, &debugaltlink_view, error_callback, data);
|
|
debugaltlink_view_valid = 0;
|
|
}
|
|
|
|
/* Read all the debug sections in a single view, since they are
|
|
probably adjacent in the file. If any of sections are
|
|
uncompressed, we never release this view. */
|
|
|
|
min_offset = 0;
|
|
max_offset = 0;
|
|
for (i = 0; i < (int) DEBUG_MAX; ++i)
|
|
{
|
|
off_t end;
|
|
|
|
if (sections[i].size != 0)
|
|
{
|
|
if (min_offset == 0 || sections[i].offset < min_offset)
|
|
min_offset = sections[i].offset;
|
|
end = sections[i].offset + sections[i].size;
|
|
if (end > max_offset)
|
|
max_offset = end;
|
|
}
|
|
if (zsections[i].size != 0)
|
|
{
|
|
if (min_offset == 0 || zsections[i].offset < min_offset)
|
|
min_offset = zsections[i].offset;
|
|
end = zsections[i].offset + zsections[i].size;
|
|
if (end > max_offset)
|
|
max_offset = end;
|
|
}
|
|
}
|
|
if (min_offset == 0 || max_offset == 0)
|
|
{
|
|
if (!backtrace_close (descriptor, error_callback, data))
|
|
goto fail;
|
|
return 1;
|
|
}
|
|
|
|
if (!backtrace_get_view (state, descriptor, min_offset,
|
|
max_offset - min_offset,
|
|
error_callback, data, &debug_view))
|
|
goto fail;
|
|
debug_view_valid = 1;
|
|
|
|
/* We've read all we need from the executable. */
|
|
if (!backtrace_close (descriptor, error_callback, data))
|
|
goto fail;
|
|
descriptor = -1;
|
|
|
|
using_debug_view = 0;
|
|
for (i = 0; i < (int) DEBUG_MAX; ++i)
|
|
{
|
|
if (sections[i].size == 0)
|
|
sections[i].data = NULL;
|
|
else
|
|
{
|
|
sections[i].data = ((const unsigned char *) debug_view.data
|
|
+ (sections[i].offset - min_offset));
|
|
++using_debug_view;
|
|
}
|
|
|
|
if (zsections[i].size == 0)
|
|
zsections[i].data = NULL;
|
|
else
|
|
zsections[i].data = ((const unsigned char *) debug_view.data
|
|
+ (zsections[i].offset - min_offset));
|
|
}
|
|
|
|
/* Uncompress the old format (--compress-debug-sections=zlib-gnu). */
|
|
|
|
zdebug_table = NULL;
|
|
for (i = 0; i < (int) DEBUG_MAX; ++i)
|
|
{
|
|
if (sections[i].size == 0 && zsections[i].size > 0)
|
|
{
|
|
unsigned char *uncompressed_data;
|
|
size_t uncompressed_size;
|
|
|
|
if (zdebug_table == NULL)
|
|
{
|
|
zdebug_table = ((uint16_t *)
|
|
backtrace_alloc (state, ZDEBUG_TABLE_SIZE,
|
|
error_callback, data));
|
|
if (zdebug_table == NULL)
|
|
goto fail;
|
|
}
|
|
|
|
uncompressed_data = NULL;
|
|
uncompressed_size = 0;
|
|
if (!elf_uncompress_zdebug (state, zsections[i].data,
|
|
zsections[i].size, zdebug_table,
|
|
error_callback, data,
|
|
&uncompressed_data, &uncompressed_size))
|
|
goto fail;
|
|
sections[i].data = uncompressed_data;
|
|
sections[i].size = uncompressed_size;
|
|
sections[i].compressed = 0;
|
|
}
|
|
}
|
|
|
|
/* Uncompress the official ELF format
|
|
(--compress-debug-sections=zlib-gabi). */
|
|
for (i = 0; i < (int) DEBUG_MAX; ++i)
|
|
{
|
|
unsigned char *uncompressed_data;
|
|
size_t uncompressed_size;
|
|
|
|
if (sections[i].size == 0 || !sections[i].compressed)
|
|
continue;
|
|
|
|
if (zdebug_table == NULL)
|
|
{
|
|
zdebug_table = ((uint16_t *)
|
|
backtrace_alloc (state, ZDEBUG_TABLE_SIZE,
|
|
error_callback, data));
|
|
if (zdebug_table == NULL)
|
|
goto fail;
|
|
}
|
|
|
|
uncompressed_data = NULL;
|
|
uncompressed_size = 0;
|
|
if (!elf_uncompress_chdr (state, sections[i].data, sections[i].size,
|
|
zdebug_table, error_callback, data,
|
|
&uncompressed_data, &uncompressed_size))
|
|
goto fail;
|
|
sections[i].data = uncompressed_data;
|
|
sections[i].size = uncompressed_size;
|
|
sections[i].compressed = 0;
|
|
|
|
--using_debug_view;
|
|
}
|
|
|
|
if (zdebug_table != NULL)
|
|
backtrace_free (state, zdebug_table, ZDEBUG_TABLE_SIZE,
|
|
error_callback, data);
|
|
|
|
if (debug_view_valid && using_debug_view == 0)
|
|
{
|
|
backtrace_release_view (state, &debug_view, error_callback, data);
|
|
debug_view_valid = 0;
|
|
}
|
|
|
|
for (i = 0; i < (int) DEBUG_MAX; ++i)
|
|
{
|
|
dwarf_sections.data[i] = sections[i].data;
|
|
dwarf_sections.size[i] = sections[i].size;
|
|
}
|
|
|
|
if (!backtrace_dwarf_add (state, base_address, &dwarf_sections,
|
|
ehdr.e_ident[EI_DATA] == ELFDATA2MSB,
|
|
fileline_altlink,
|
|
error_callback, data, fileline_fn,
|
|
fileline_entry))
|
|
goto fail;
|
|
|
|
*found_dwarf = 1;
|
|
|
|
return 1;
|
|
|
|
fail:
|
|
if (shdrs_view_valid)
|
|
backtrace_release_view (state, &shdrs_view, error_callback, data);
|
|
if (names_view_valid)
|
|
backtrace_release_view (state, &names_view, error_callback, data);
|
|
if (symtab_view_valid)
|
|
backtrace_release_view (state, &symtab_view, error_callback, data);
|
|
if (strtab_view_valid)
|
|
backtrace_release_view (state, &strtab_view, error_callback, data);
|
|
if (debuglink_view_valid)
|
|
backtrace_release_view (state, &debuglink_view, error_callback, data);
|
|
if (debugaltlink_view_valid)
|
|
backtrace_release_view (state, &debugaltlink_view, error_callback, data);
|
|
if (buildid_view_valid)
|
|
backtrace_release_view (state, &buildid_view, error_callback, data);
|
|
if (debug_view_valid)
|
|
backtrace_release_view (state, &debug_view, error_callback, data);
|
|
if (opd)
|
|
backtrace_release_view (state, &opd->view, error_callback, data);
|
|
if (descriptor != -1)
|
|
backtrace_close (descriptor, error_callback, data);
|
|
return 0;
|
|
}
|
|
|
|
/* Data passed to phdr_callback. */
|
|
|
|
struct phdr_data
|
|
{
|
|
struct backtrace_state *state;
|
|
backtrace_error_callback error_callback;
|
|
void *data;
|
|
fileline *fileline_fn;
|
|
int *found_sym;
|
|
int *found_dwarf;
|
|
const char *exe_filename;
|
|
int exe_descriptor;
|
|
};
|
|
|
|
/* Callback passed to dl_iterate_phdr. Load debug info from shared
|
|
libraries. */
|
|
|
|
static int
|
|
#ifdef __i386__
|
|
__attribute__ ((__force_align_arg_pointer__))
|
|
#endif
|
|
phdr_callback (struct dl_phdr_info *info, size_t size ATTRIBUTE_UNUSED,
|
|
void *pdata)
|
|
{
|
|
struct phdr_data *pd = (struct phdr_data *) pdata;
|
|
const char *filename;
|
|
int descriptor;
|
|
int does_not_exist;
|
|
fileline elf_fileline_fn;
|
|
int found_dwarf;
|
|
|
|
/* There is not much we can do if we don't have the module name,
|
|
unless executable is ET_DYN, where we expect the very first
|
|
phdr_callback to be for the PIE. */
|
|
if (info->dlpi_name == NULL || info->dlpi_name[0] == '\0')
|
|
{
|
|
if (pd->exe_descriptor == -1)
|
|
return 0;
|
|
filename = pd->exe_filename;
|
|
descriptor = pd->exe_descriptor;
|
|
pd->exe_descriptor = -1;
|
|
}
|
|
else
|
|
{
|
|
if (pd->exe_descriptor != -1)
|
|
{
|
|
backtrace_close (pd->exe_descriptor, pd->error_callback, pd->data);
|
|
pd->exe_descriptor = -1;
|
|
}
|
|
|
|
filename = info->dlpi_name;
|
|
descriptor = backtrace_open (info->dlpi_name, pd->error_callback,
|
|
pd->data, &does_not_exist);
|
|
if (descriptor < 0)
|
|
return 0;
|
|
}
|
|
|
|
if (elf_add (pd->state, filename, descriptor, info->dlpi_addr,
|
|
pd->error_callback, pd->data, &elf_fileline_fn, pd->found_sym,
|
|
&found_dwarf, NULL, 0, 0, NULL, 0))
|
|
{
|
|
if (found_dwarf)
|
|
{
|
|
*pd->found_dwarf = 1;
|
|
*pd->fileline_fn = elf_fileline_fn;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Initialize the backtrace data we need from an ELF executable. At
|
|
the ELF level, all we need to do is find the debug info
|
|
sections. */
|
|
|
|
int
|
|
backtrace_initialize (struct backtrace_state *state, const char *filename,
|
|
int descriptor, backtrace_error_callback error_callback,
|
|
void *data, fileline *fileline_fn)
|
|
{
|
|
int ret;
|
|
int found_sym;
|
|
int found_dwarf;
|
|
fileline elf_fileline_fn = elf_nodebug;
|
|
struct phdr_data pd;
|
|
|
|
ret = elf_add (state, filename, descriptor, 0, error_callback, data,
|
|
&elf_fileline_fn, &found_sym, &found_dwarf, NULL, 1, 0, NULL,
|
|
0);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
pd.state = state;
|
|
pd.error_callback = error_callback;
|
|
pd.data = data;
|
|
pd.fileline_fn = &elf_fileline_fn;
|
|
pd.found_sym = &found_sym;
|
|
pd.found_dwarf = &found_dwarf;
|
|
pd.exe_filename = filename;
|
|
pd.exe_descriptor = ret < 0 ? descriptor : -1;
|
|
|
|
dl_iterate_phdr (phdr_callback, (void *) &pd);
|
|
|
|
if (!state->threaded)
|
|
{
|
|
if (found_sym)
|
|
state->syminfo_fn = elf_syminfo;
|
|
else if (state->syminfo_fn == NULL)
|
|
state->syminfo_fn = elf_nosyms;
|
|
}
|
|
else
|
|
{
|
|
if (found_sym)
|
|
backtrace_atomic_store_pointer (&state->syminfo_fn, elf_syminfo);
|
|
else
|
|
(void) __sync_bool_compare_and_swap (&state->syminfo_fn, NULL,
|
|
elf_nosyms);
|
|
}
|
|
|
|
if (!state->threaded)
|
|
*fileline_fn = state->fileline_fn;
|
|
else
|
|
*fileline_fn = backtrace_atomic_load_pointer (&state->fileline_fn);
|
|
|
|
if (*fileline_fn == NULL || *fileline_fn == elf_nodebug)
|
|
*fileline_fn = elf_fileline_fn;
|
|
|
|
return 1;
|
|
}
|