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-rw-r--r--src/3rdparty/libbacktrace/libbacktrace/elf.c3435
1 files changed, 3435 insertions, 0 deletions
diff --git a/src/3rdparty/libbacktrace/libbacktrace/elf.c b/src/3rdparty/libbacktrace/libbacktrace/elf.c
new file mode 100644
index 00000000..d1d257b1
--- /dev/null
+++ b/src/3rdparty/libbacktrace/libbacktrace/elf.c
@@ -0,0 +1,3435 @@
+/* elf.c -- Get debug data from an ELF file for backtraces.
+ Copyright (C) 2012-2019 Free Software Foundation, Inc.
+ Written by Ian Lance Taylor, Google.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+ (1) Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ (2) Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+
+ (3) The name of the author may not be used to
+ endorse or promote products derived from this software without
+ specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE. */
+
+#include "config.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#ifdef HAVE_DL_ITERATE_PHDR
+#include <link.h>
+#endif
+
+#include "backtrace.h"
+#include "internal.h"
+
+#ifndef S_ISLNK
+ #ifndef S_IFLNK
+ #define S_IFLNK 0120000
+ #endif
+ #ifndef S_IFMT
+ #define S_IFMT 0170000
+ #endif
+ #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
+#endif
+
+#ifndef __GNUC__
+#define __builtin_prefetch(p, r, l)
+#define unlikely(x) (x)
+#else
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#endif
+
+#if !defined(HAVE_DECL_STRNLEN) || !HAVE_DECL_STRNLEN
+
+/* If strnlen is not declared, provide our own version. */
+
+static size_t
+xstrnlen (const char *s, size_t maxlen)
+{
+ size_t i;
+
+ for (i = 0; i < maxlen; ++i)
+ if (s[i] == '\0')
+ break;
+ return i;
+}
+
+#define strnlen xstrnlen
+
+#endif
+
+#ifndef HAVE_LSTAT
+
+/* Dummy version of lstat for systems that don't have it. */
+
+static int
+xlstat (const char *path ATTRIBUTE_UNUSED, struct stat *st ATTRIBUTE_UNUSED)
+{
+ return -1;
+}
+
+#define lstat xlstat
+
+#endif
+
+#ifndef HAVE_READLINK
+
+/* Dummy version of readlink for systems that don't have it. */
+
+static ssize_t
+xreadlink (const char *path ATTRIBUTE_UNUSED, char *buf ATTRIBUTE_UNUSED,
+ size_t bufsz ATTRIBUTE_UNUSED)
+{
+ return -1;
+}
+
+#define readlink xreadlink
+
+#endif
+
+#ifndef HAVE_DL_ITERATE_PHDR
+
+/* Dummy version of dl_iterate_phdr for systems that don't have it. */
+
+#define dl_phdr_info x_dl_phdr_info
+#define dl_iterate_phdr x_dl_iterate_phdr
+
+struct dl_phdr_info
+{
+ uintptr_t dlpi_addr;
+ const char *dlpi_name;
+};
+
+static int
+dl_iterate_phdr (int (*callback) (struct dl_phdr_info *,
+ size_t, void *) ATTRIBUTE_UNUSED,
+ void *data ATTRIBUTE_UNUSED)
+{
+ return 0;
+}
+
+#endif /* ! defined (HAVE_DL_ITERATE_PHDR) */
+
+/* The configure script must tell us whether we are 32-bit or 64-bit
+ ELF. We could make this code test and support either possibility,
+ but there is no point. This code only works for the currently
+ running executable, which means that we know the ELF mode at
+ configure time. */
+
+#if BACKTRACE_ELF_SIZE != 32 && BACKTRACE_ELF_SIZE != 64
+#error "Unknown BACKTRACE_ELF_SIZE"
+#endif
+
+/* <link.h> might #include <elf.h> which might define our constants
+ with slightly different values. Undefine them to be safe. */
+
+#undef EI_NIDENT
+#undef EI_MAG0
+#undef EI_MAG1
+#undef EI_MAG2
+#undef EI_MAG3
+#undef EI_CLASS
+#undef EI_DATA
+#undef EI_VERSION
+#undef ELF_MAG0
+#undef ELF_MAG1
+#undef ELF_MAG2
+#undef ELF_MAG3
+#undef ELFCLASS32
+#undef ELFCLASS64
+#undef ELFDATA2LSB
+#undef ELFDATA2MSB
+#undef EV_CURRENT
+#undef ET_DYN
+#undef EM_PPC64
+#undef EF_PPC64_ABI
+#undef SHN_LORESERVE
+#undef SHN_XINDEX
+#undef SHN_UNDEF
+#undef SHT_PROGBITS
+#undef SHT_SYMTAB
+#undef SHT_STRTAB
+#undef SHT_DYNSYM
+#undef SHF_COMPRESSED
+#undef STT_OBJECT
+#undef STT_FUNC
+#undef NT_GNU_BUILD_ID
+#undef ELFCOMPRESS_ZLIB
+
+/* Basic types. */
+
+typedef uint16_t b_elf_half; /* Elf_Half. */
+typedef uint32_t b_elf_word; /* Elf_Word. */
+typedef int32_t b_elf_sword; /* Elf_Sword. */
+
+#if BACKTRACE_ELF_SIZE == 32
+
+typedef uint32_t b_elf_addr; /* Elf_Addr. */
+typedef uint32_t b_elf_off; /* Elf_Off. */
+
+typedef uint32_t b_elf_wxword; /* 32-bit Elf_Word, 64-bit ELF_Xword. */
+
+#else
+
+typedef uint64_t b_elf_addr; /* Elf_Addr. */
+typedef uint64_t b_elf_off; /* Elf_Off. */
+typedef uint64_t b_elf_xword; /* Elf_Xword. */
+typedef int64_t b_elf_sxword; /* Elf_Sxword. */
+
+typedef uint64_t b_elf_wxword; /* 32-bit Elf_Word, 64-bit ELF_Xword. */
+
+#endif
+
+/* Data structures and associated constants. */
+
+#define EI_NIDENT 16
+
+typedef struct {
+ unsigned char e_ident[EI_NIDENT]; /* ELF "magic number" */
+ b_elf_half e_type; /* Identifies object file type */
+ b_elf_half e_machine; /* Specifies required architecture */
+ b_elf_word e_version; /* Identifies object file version */
+ b_elf_addr e_entry; /* Entry point virtual address */
+ b_elf_off e_phoff; /* Program header table file offset */
+ b_elf_off e_shoff; /* Section header table file offset */
+ b_elf_word e_flags; /* Processor-specific flags */
+ b_elf_half e_ehsize; /* ELF header size in bytes */
+ b_elf_half e_phentsize; /* Program header table entry size */
+ b_elf_half e_phnum; /* Program header table entry count */
+ b_elf_half e_shentsize; /* Section header table entry size */
+ b_elf_half e_shnum; /* Section header table entry count */
+ b_elf_half e_shstrndx; /* Section header string table index */
+} b_elf_ehdr; /* Elf_Ehdr. */
+
+#define EI_MAG0 0
+#define EI_MAG1 1
+#define EI_MAG2 2
+#define EI_MAG3 3
+#define EI_CLASS 4
+#define EI_DATA 5
+#define EI_VERSION 6
+
+#define ELFMAG0 0x7f
+#define ELFMAG1 'E'
+#define ELFMAG2 'L'
+#define ELFMAG3 'F'
+
+#define ELFCLASS32 1
+#define ELFCLASS64 2
+
+#define ELFDATA2LSB 1
+#define ELFDATA2MSB 2
+
+#define EV_CURRENT 1
+
+#define ET_DYN 3
+
+#define EM_PPC64 21
+#define EF_PPC64_ABI 3
+
+typedef struct {
+ b_elf_word sh_name; /* Section name, index in string tbl */
+ b_elf_word sh_type; /* Type of section */
+ b_elf_wxword sh_flags; /* Miscellaneous section attributes */
+ b_elf_addr sh_addr; /* Section virtual addr at execution */
+ b_elf_off sh_offset; /* Section file offset */
+ b_elf_wxword sh_size; /* Size of section in bytes */
+ b_elf_word sh_link; /* Index of another section */
+ b_elf_word sh_info; /* Additional section information */
+ b_elf_wxword sh_addralign; /* Section alignment */
+ b_elf_wxword sh_entsize; /* Entry size if section holds table */
+} b_elf_shdr; /* Elf_Shdr. */
+
+#define SHN_UNDEF 0x0000 /* Undefined section */
+#define SHN_LORESERVE 0xFF00 /* Begin range of reserved indices */
+#define SHN_XINDEX 0xFFFF /* Section index is held elsewhere */
+
+#define SHT_PROGBITS 1
+#define SHT_SYMTAB 2
+#define SHT_STRTAB 3
+#define SHT_DYNSYM 11
+
+#define SHF_COMPRESSED 0x800
+
+#if BACKTRACE_ELF_SIZE == 32
+
+typedef struct
+{
+ b_elf_word st_name; /* Symbol name, index in string tbl */
+ b_elf_addr st_value; /* Symbol value */
+ b_elf_word st_size; /* Symbol size */
+ unsigned char st_info; /* Symbol binding and type */
+ unsigned char st_other; /* Visibility and other data */
+ b_elf_half st_shndx; /* Symbol section index */
+} b_elf_sym; /* Elf_Sym. */
+
+#else /* BACKTRACE_ELF_SIZE != 32 */
+
+typedef struct
+{
+ b_elf_word st_name; /* Symbol name, index in string tbl */
+ unsigned char st_info; /* Symbol binding and type */
+ unsigned char st_other; /* Visibility and other data */
+ b_elf_half st_shndx; /* Symbol section index */
+ b_elf_addr st_value; /* Symbol value */
+ b_elf_xword st_size; /* Symbol size */
+} b_elf_sym; /* Elf_Sym. */
+
+#endif /* BACKTRACE_ELF_SIZE != 32 */
+
+#define STT_OBJECT 1
+#define STT_FUNC 2
+
+typedef struct
+{
+ uint32_t namesz;
+ uint32_t descsz;
+ uint32_t type;
+ char name[1];
+} b_elf_note;
+
+#define NT_GNU_BUILD_ID 3
+
+#if BACKTRACE_ELF_SIZE == 32
+
+typedef struct
+{
+ b_elf_word ch_type; /* Compresstion algorithm */
+ b_elf_word ch_size; /* Uncompressed size */
+ b_elf_word ch_addralign; /* Alignment for uncompressed data */
+} b_elf_chdr; /* Elf_Chdr */
+
+#else /* BACKTRACE_ELF_SIZE != 32 */
+
+typedef struct
+{
+ b_elf_word ch_type; /* Compression algorithm */
+ b_elf_word ch_reserved; /* Reserved */
+ b_elf_xword ch_size; /* Uncompressed size */
+ b_elf_xword ch_addralign; /* Alignment for uncompressed data */
+} b_elf_chdr; /* Elf_Chdr */
+
+#endif /* BACKTRACE_ELF_SIZE != 32 */
+
+#define ELFCOMPRESS_ZLIB 1
+
+/* Names of sections, indexed by enum dwarf_section in internal.h. */
+
+static const char * const dwarf_section_names[DEBUG_MAX] =
+{
+ ".debug_info",
+ ".debug_line",
+ ".debug_abbrev",
+ ".debug_ranges",
+ ".debug_str",
+ ".debug_addr",
+ ".debug_str_offsets",
+ ".debug_line_str",
+ ".debug_rnglists"
+};
+
+/* Information we gather for the sections we care about. */
+
+struct debug_section_info
+{
+ /* Section file offset. */
+ off_t offset;
+ /* Section size. */
+ size_t size;
+ /* Section contents, after read from file. */
+ const unsigned char *data;
+ /* Whether the SHF_COMPRESSED flag is set for the section. */
+ int compressed;
+};
+
+/* Information we keep for an ELF symbol. */
+
+struct elf_symbol
+{
+ /* The name of the symbol. */
+ const char *name;
+ /* The address of the symbol. */
+ uintptr_t address;
+ /* The size of the symbol. */
+ size_t size;
+};
+
+/* Information to pass to elf_syminfo. */
+
+struct elf_syminfo_data
+{
+ /* Symbols for the next module. */
+ struct elf_syminfo_data *next;
+ /* The ELF symbols, sorted by address. */
+ struct elf_symbol *symbols;
+ /* The number of symbols. */
+ size_t count;
+};
+
+/* Information about PowerPC64 ELFv1 .opd section. */
+
+struct elf_ppc64_opd_data
+{
+ /* Address of the .opd section. */
+ b_elf_addr addr;
+ /* Section data. */
+ const char *data;
+ /* Size of the .opd section. */
+ size_t size;
+ /* Corresponding section view. */
+ struct backtrace_view view;
+};
+
+/* Compute the CRC-32 of BUF/LEN. This uses the CRC used for
+ .gnu_debuglink files. */
+
+static uint32_t
+elf_crc32 (uint32_t crc, const unsigned char *buf, size_t len)
+{
+ static const uint32_t crc32_table[256] =
+ {
+ 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
+ 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
+ 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
+ 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
+ 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
+ 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+ 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
+ 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+ 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
+ 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
+ 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
+ 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+ 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
+ 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
+ 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
+ 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+ 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
+ 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+ 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
+ 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
+ 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
+ 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
+ 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
+ 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+ 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
+ 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
+ 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
+ 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
+ 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
+ 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+ 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
+ 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+ 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
+ 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
+ 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
+ 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+ 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
+ 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
+ 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
+ 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+ 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
+ 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+ 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
+ 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
+ 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
+ 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
+ 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
+ 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+ 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
+ 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
+ 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
+ 0x2d02ef8d
+ };
+ const unsigned char *end;
+
+ crc = ~crc;
+ 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 = &note->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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-09 18:09:17 +0000