mirror of
https://github.com/autc04/Retro68.git
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936 lines
23 KiB
C
936 lines
23 KiB
C
/* pecoff.c -- Get debug data from a PE/COFFF file for backtraces.
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Copyright (C) 2015-2022 Free Software Foundation, Inc.
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Adapted from elf.c by Tristan Gingold, AdaCore.
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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 <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include "backtrace.h"
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#include "internal.h"
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/* Coff file header. */
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typedef struct {
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uint16_t machine;
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uint16_t number_of_sections;
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uint32_t time_date_stamp;
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uint32_t pointer_to_symbol_table;
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uint32_t number_of_symbols;
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uint16_t size_of_optional_header;
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uint16_t characteristics;
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} b_coff_file_header;
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/* Coff optional header. */
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typedef struct {
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uint16_t magic;
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uint8_t major_linker_version;
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uint8_t minor_linker_version;
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uint32_t size_of_code;
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uint32_t size_of_initialized_data;
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uint32_t size_of_uninitialized_data;
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uint32_t address_of_entry_point;
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uint32_t base_of_code;
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union {
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struct {
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uint32_t base_of_data;
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uint32_t image_base;
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} pe;
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struct {
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uint64_t image_base;
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} pep;
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} u;
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} b_coff_optional_header;
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/* Values of magic in optional header. */
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#define PE_MAGIC 0x10b /* PE32 executable. */
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#define PEP_MAGIC 0x20b /* PE32+ executable (for 64bit targets). */
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/* Coff section header. */
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typedef struct {
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char name[8];
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uint32_t virtual_size;
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uint32_t virtual_address;
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uint32_t size_of_raw_data;
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uint32_t pointer_to_raw_data;
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uint32_t pointer_to_relocations;
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uint32_t pointer_to_line_numbers;
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uint16_t number_of_relocations;
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uint16_t number_of_line_numbers;
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uint32_t characteristics;
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} b_coff_section_header;
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/* Coff symbol name. */
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typedef union {
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char short_name[8];
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struct {
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unsigned char zeroes[4];
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unsigned char off[4];
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} long_name;
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} b_coff_name;
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/* Coff symbol (external representation which is unaligned). */
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typedef struct {
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b_coff_name name;
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unsigned char value[4];
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unsigned char section_number[2];
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unsigned char type[2];
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unsigned char storage_class;
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unsigned char number_of_aux_symbols;
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} b_coff_external_symbol;
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/* Symbol types. */
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#define N_TBSHFT 4 /* Shift for the derived type. */
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#define IMAGE_SYM_DTYPE_FUNCTION 2 /* Function derived type. */
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/* Size of a coff symbol. */
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#define SYM_SZ 18
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/* Coff symbol, internal representation (aligned). */
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typedef struct {
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const char *name;
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uint32_t value;
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int16_t sec;
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uint16_t type;
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uint16_t sc;
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} b_coff_internal_symbol;
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/* Names of sections, indexed by enum dwarf_section in internal.h. */
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static const char * const debug_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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};
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/* Information we keep for an coff symbol. */
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struct coff_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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};
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/* Information to pass to coff_syminfo. */
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struct coff_syminfo_data
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{
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/* Symbols for the next module. */
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struct coff_syminfo_data *next;
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/* The COFF symbols, sorted by address. */
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struct coff_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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/* A dummy callback function used when we can't find any debug info. */
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static int
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coff_nodebug (struct backtrace_state *state ATTRIBUTE_UNUSED,
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uintptr_t pc ATTRIBUTE_UNUSED,
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backtrace_full_callback callback ATTRIBUTE_UNUSED,
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backtrace_error_callback error_callback, void *data)
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{
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error_callback (data, "no debug info in PE/COFF executable", -1);
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return 0;
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}
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/* A dummy callback function used when we can't find a symbol
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table. */
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static void
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coff_nosyms (struct backtrace_state *state ATTRIBUTE_UNUSED,
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uintptr_t addr ATTRIBUTE_UNUSED,
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backtrace_syminfo_callback callback ATTRIBUTE_UNUSED,
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backtrace_error_callback error_callback, void *data)
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{
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error_callback (data, "no symbol table in PE/COFF executable", -1);
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}
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/* Read a potentially unaligned 4 byte word at P, using native endianness. */
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static uint32_t
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coff_read4 (const unsigned char *p)
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{
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uint32_t res;
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memcpy (&res, p, 4);
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return res;
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}
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/* Read a potentially unaligned 2 byte word at P, using native endianness.
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All 2 byte word in symbols are always aligned, but for coherency all
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fields are declared as char arrays. */
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static uint16_t
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coff_read2 (const unsigned char *p)
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{
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uint16_t res;
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memcpy (&res, p, sizeof (res));
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return res;
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}
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/* Return the length (without the trailing 0) of a COFF short name. */
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static size_t
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coff_short_name_len (const char *name)
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{
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int i;
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for (i = 0; i < 8; i++)
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if (name[i] == 0)
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return i;
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return 8;
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}
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/* Return true iff COFF short name CNAME is the same as NAME (a NUL-terminated
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string). */
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static int
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coff_short_name_eq (const char *name, const char *cname)
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{
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int i;
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for (i = 0; i < 8; i++)
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{
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if (name[i] != cname[i])
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return 0;
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if (name[i] == 0)
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return 1;
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}
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return name[8] == 0;
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}
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/* Return true iff NAME is the same as string at offset OFF. */
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static int
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coff_long_name_eq (const char *name, unsigned int off,
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struct backtrace_view *str_view)
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{
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if (off >= str_view->len)
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return 0;
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return strcmp (name, (const char *)str_view->data + off) == 0;
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}
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/* Compare struct coff_symbol for qsort. */
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static int
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coff_symbol_compare (const void *v1, const void *v2)
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{
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const struct coff_symbol *e1 = (const struct coff_symbol *) v1;
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const struct coff_symbol *e2 = (const struct coff_symbol *) v2;
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if (e1->address < e2->address)
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return -1;
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else if (e1->address > e2->address)
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return 1;
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else
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return 0;
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}
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/* Convert SYM to internal (and aligned) format ISYM, using string table
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from STRTAB and STRTAB_SIZE, and number of sections SECTS_NUM.
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Return -1 in case of error (invalid section number or string index). */
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static int
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coff_expand_symbol (b_coff_internal_symbol *isym,
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const b_coff_external_symbol *sym,
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uint16_t sects_num,
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const unsigned char *strtab, size_t strtab_size)
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{
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isym->type = coff_read2 (sym->type);
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isym->sec = coff_read2 (sym->section_number);
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isym->sc = sym->storage_class;
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if (isym->sec > 0 && (uint16_t) isym->sec > sects_num)
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return -1;
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if (sym->name.short_name[0] != 0)
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isym->name = sym->name.short_name;
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else
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{
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uint32_t off = coff_read4 (sym->name.long_name.off);
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if (off >= strtab_size)
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return -1;
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isym->name = (const char *) strtab + off;
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}
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return 0;
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}
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/* Return true iff SYM is a defined symbol for a function. Data symbols
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aren't considered because they aren't easily identified (same type as
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section names, presence of symbols defined by the linker script). */
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static int
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coff_is_function_symbol (const b_coff_internal_symbol *isym)
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{
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return (isym->type >> N_TBSHFT) == IMAGE_SYM_DTYPE_FUNCTION
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&& isym->sec > 0;
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}
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/* Initialize the symbol table info for coff_syminfo. */
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static int
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coff_initialize_syminfo (struct backtrace_state *state,
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uintptr_t base_address, int is_64,
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const b_coff_section_header *sects, size_t sects_num,
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const b_coff_external_symbol *syms, size_t syms_size,
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const unsigned char *strtab, size_t strtab_size,
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backtrace_error_callback error_callback,
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void *data, struct coff_syminfo_data *sdata)
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{
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size_t syms_count;
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char *coff_symstr;
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size_t coff_symstr_len;
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size_t coff_symbol_count;
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size_t coff_symbol_size;
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struct coff_symbol *coff_symbols;
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struct coff_symbol *coff_sym;
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char *coff_str;
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size_t i;
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syms_count = syms_size / SYM_SZ;
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/* We only care about function symbols. Count them. Also count size of
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strings for in-symbol names. */
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coff_symbol_count = 0;
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coff_symstr_len = 0;
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for (i = 0; i < syms_count; ++i)
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{
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const b_coff_external_symbol *asym = &syms[i];
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b_coff_internal_symbol isym;
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if (coff_expand_symbol (&isym, asym, sects_num, strtab, strtab_size) < 0)
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{
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error_callback (data, "invalid section or offset in coff symbol", 0);
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return 0;
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}
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if (coff_is_function_symbol (&isym))
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{
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++coff_symbol_count;
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if (asym->name.short_name[0] != 0)
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coff_symstr_len += coff_short_name_len (asym->name.short_name) + 1;
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}
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i += asym->number_of_aux_symbols;
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}
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coff_symbol_size = (coff_symbol_count + 1) * sizeof (struct coff_symbol);
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coff_symbols = ((struct coff_symbol *)
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backtrace_alloc (state, coff_symbol_size, error_callback,
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data));
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if (coff_symbols == NULL)
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return 0;
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/* Allocate memory for symbols strings. */
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if (coff_symstr_len > 0)
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{
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coff_symstr = ((char *)
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backtrace_alloc (state, coff_symstr_len, error_callback,
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data));
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if (coff_symstr == NULL)
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{
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backtrace_free (state, coff_symbols, coff_symbol_size,
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error_callback, data);
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return 0;
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}
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}
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else
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coff_symstr = NULL;
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/* Copy symbols. */
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coff_sym = coff_symbols;
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coff_str = coff_symstr;
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for (i = 0; i < syms_count; ++i)
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{
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const b_coff_external_symbol *asym = &syms[i];
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b_coff_internal_symbol isym;
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if (coff_expand_symbol (&isym, asym, sects_num, strtab, strtab_size))
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{
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/* Should not fail, as it was already tested in the previous
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loop. */
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abort ();
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}
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if (coff_is_function_symbol (&isym))
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{
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const char *name;
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int16_t secnum;
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if (asym->name.short_name[0] != 0)
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{
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size_t len = coff_short_name_len (isym.name);
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name = coff_str;
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memcpy (coff_str, isym.name, len);
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coff_str[len] = 0;
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coff_str += len + 1;
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}
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else
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name = isym.name;
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if (!is_64)
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{
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/* Strip leading '_'. */
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if (name[0] == '_')
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name++;
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}
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/* Symbol value is section relative, so we need to read the address
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of its section. */
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secnum = coff_read2 (asym->section_number);
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coff_sym->name = name;
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coff_sym->address = (coff_read4 (asym->value)
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+ sects[secnum - 1].virtual_address
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+ base_address);
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coff_sym++;
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}
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i += asym->number_of_aux_symbols;
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}
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/* End of symbols marker. */
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coff_sym->name = NULL;
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coff_sym->address = -1;
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backtrace_qsort (coff_symbols, coff_symbol_count,
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sizeof (struct coff_symbol), coff_symbol_compare);
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sdata->next = NULL;
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sdata->symbols = coff_symbols;
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sdata->count = coff_symbol_count;
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return 1;
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}
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/* Add EDATA to the list in STATE. */
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static void
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coff_add_syminfo_data (struct backtrace_state *state,
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struct coff_syminfo_data *sdata)
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{
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if (!state->threaded)
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{
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struct coff_syminfo_data **pp;
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for (pp = (struct coff_syminfo_data **) (void *) &state->syminfo_data;
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*pp != NULL;
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pp = &(*pp)->next)
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;
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*pp = sdata;
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}
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else
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{
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while (1)
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{
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struct coff_syminfo_data **pp;
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pp = (struct coff_syminfo_data **) (void *) &state->syminfo_data;
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while (1)
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{
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struct coff_syminfo_data *p;
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p = backtrace_atomic_load_pointer (pp);
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if (p == NULL)
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break;
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pp = &p->next;
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}
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if (__sync_bool_compare_and_swap (pp, NULL, sdata))
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break;
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}
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}
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}
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/* Compare an ADDR against an elf_symbol for bsearch. We allocate one
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extra entry in the array so that this can look safely at the next
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entry. */
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static int
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coff_symbol_search (const void *vkey, const void *ventry)
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{
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const uintptr_t *key = (const uintptr_t *) vkey;
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const struct coff_symbol *entry = (const struct coff_symbol *) ventry;
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uintptr_t addr;
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addr = *key;
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if (addr < entry->address)
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return -1;
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else if (addr >= entry[1].address)
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return 1;
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else
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return 0;
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}
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/* Return the symbol name and value for an ADDR. */
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static void
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coff_syminfo (struct backtrace_state *state, uintptr_t addr,
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backtrace_syminfo_callback callback,
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backtrace_error_callback error_callback ATTRIBUTE_UNUSED,
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void *data)
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{
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struct coff_syminfo_data *sdata;
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struct coff_symbol *sym = NULL;
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if (!state->threaded)
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{
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for (sdata = (struct coff_syminfo_data *) state->syminfo_data;
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sdata != NULL;
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sdata = sdata->next)
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{
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sym = ((struct coff_symbol *)
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bsearch (&addr, sdata->symbols, sdata->count,
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sizeof (struct coff_symbol), coff_symbol_search));
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if (sym != NULL)
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break;
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}
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}
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else
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{
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struct coff_syminfo_data **pp;
|
|
|
|
pp = (struct coff_syminfo_data **) (void *) &state->syminfo_data;
|
|
while (1)
|
|
{
|
|
sdata = backtrace_atomic_load_pointer (pp);
|
|
if (sdata == NULL)
|
|
break;
|
|
|
|
sym = ((struct coff_symbol *)
|
|
bsearch (&addr, sdata->symbols, sdata->count,
|
|
sizeof (struct coff_symbol), coff_symbol_search));
|
|
if (sym != NULL)
|
|
break;
|
|
|
|
pp = &sdata->next;
|
|
}
|
|
}
|
|
|
|
if (sym == NULL)
|
|
callback (data, addr, NULL, 0, 0);
|
|
else
|
|
callback (data, addr, sym->name, sym->address, 0);
|
|
}
|
|
|
|
/* Add the backtrace data for one PE/COFF file. Returns 1 on success,
|
|
0 on failure (in both cases descriptor is closed). */
|
|
|
|
static int
|
|
coff_add (struct backtrace_state *state, int descriptor,
|
|
backtrace_error_callback error_callback, void *data,
|
|
fileline *fileline_fn, int *found_sym, int *found_dwarf)
|
|
{
|
|
struct backtrace_view fhdr_view;
|
|
off_t fhdr_off;
|
|
int magic_ok;
|
|
b_coff_file_header fhdr;
|
|
off_t opt_sects_off;
|
|
size_t opt_sects_size;
|
|
unsigned int sects_num;
|
|
struct backtrace_view sects_view;
|
|
int sects_view_valid;
|
|
const b_coff_optional_header *opt_hdr;
|
|
const b_coff_section_header *sects;
|
|
struct backtrace_view str_view;
|
|
int str_view_valid;
|
|
size_t str_size;
|
|
off_t str_off;
|
|
struct backtrace_view syms_view;
|
|
off_t syms_off;
|
|
size_t syms_size;
|
|
int syms_view_valid;
|
|
unsigned int syms_num;
|
|
unsigned int i;
|
|
struct debug_section_info sections[DEBUG_MAX];
|
|
off_t min_offset;
|
|
off_t max_offset;
|
|
struct backtrace_view debug_view;
|
|
int debug_view_valid;
|
|
int is_64;
|
|
uintptr_t image_base;
|
|
struct dwarf_sections dwarf_sections;
|
|
|
|
*found_sym = 0;
|
|
*found_dwarf = 0;
|
|
|
|
sects_view_valid = 0;
|
|
syms_view_valid = 0;
|
|
str_view_valid = 0;
|
|
debug_view_valid = 0;
|
|
|
|
/* Map the MS-DOS stub (if any) and extract file header offset. */
|
|
if (!backtrace_get_view (state, descriptor, 0, 0x40, error_callback,
|
|
data, &fhdr_view))
|
|
goto fail;
|
|
|
|
{
|
|
const unsigned char *vptr = fhdr_view.data;
|
|
|
|
if (vptr[0] == 'M' && vptr[1] == 'Z')
|
|
fhdr_off = coff_read4 (vptr + 0x3c);
|
|
else
|
|
fhdr_off = 0;
|
|
}
|
|
|
|
backtrace_release_view (state, &fhdr_view, error_callback, data);
|
|
|
|
/* Map the coff file header. */
|
|
if (!backtrace_get_view (state, descriptor, fhdr_off,
|
|
sizeof (b_coff_file_header) + 4,
|
|
error_callback, data, &fhdr_view))
|
|
goto fail;
|
|
|
|
if (fhdr_off != 0)
|
|
{
|
|
const char *magic = (const char *) fhdr_view.data;
|
|
magic_ok = memcmp (magic, "PE\0", 4) == 0;
|
|
fhdr_off += 4;
|
|
|
|
memcpy (&fhdr, fhdr_view.data + 4, sizeof fhdr);
|
|
}
|
|
else
|
|
{
|
|
memcpy (&fhdr, fhdr_view.data, sizeof fhdr);
|
|
/* TODO: test fhdr.machine for coff but non-PE platforms. */
|
|
magic_ok = 0;
|
|
}
|
|
backtrace_release_view (state, &fhdr_view, error_callback, data);
|
|
|
|
if (!magic_ok)
|
|
{
|
|
error_callback (data, "executable file is not COFF", 0);
|
|
goto fail;
|
|
}
|
|
|
|
sects_num = fhdr.number_of_sections;
|
|
syms_num = fhdr.number_of_symbols;
|
|
|
|
opt_sects_off = fhdr_off + sizeof (fhdr);
|
|
opt_sects_size = (fhdr.size_of_optional_header
|
|
+ sects_num * sizeof (b_coff_section_header));
|
|
|
|
/* To translate PC to file/line when using DWARF, we need to find
|
|
the .debug_info and .debug_line sections. */
|
|
|
|
/* Read the optional header and the section headers. */
|
|
|
|
if (!backtrace_get_view (state, descriptor, opt_sects_off, opt_sects_size,
|
|
error_callback, data, §s_view))
|
|
goto fail;
|
|
sects_view_valid = 1;
|
|
opt_hdr = (const b_coff_optional_header *) sects_view.data;
|
|
sects = (const b_coff_section_header *)
|
|
(sects_view.data + fhdr.size_of_optional_header);
|
|
|
|
is_64 = 0;
|
|
if (fhdr.size_of_optional_header > sizeof (*opt_hdr))
|
|
{
|
|
if (opt_hdr->magic == PE_MAGIC)
|
|
image_base = opt_hdr->u.pe.image_base;
|
|
else if (opt_hdr->magic == PEP_MAGIC)
|
|
{
|
|
image_base = opt_hdr->u.pep.image_base;
|
|
is_64 = 1;
|
|
}
|
|
else
|
|
{
|
|
error_callback (data, "bad magic in PE optional header", 0);
|
|
goto fail;
|
|
}
|
|
}
|
|
else
|
|
image_base = 0;
|
|
|
|
/* Read the symbol table and the string table. */
|
|
|
|
if (fhdr.pointer_to_symbol_table == 0)
|
|
{
|
|
/* No symbol table, no string table. */
|
|
str_off = 0;
|
|
str_size = 0;
|
|
syms_num = 0;
|
|
syms_size = 0;
|
|
}
|
|
else
|
|
{
|
|
/* Symbol table is followed by the string table. The string table
|
|
starts with its length (on 4 bytes).
|
|
Map the symbol table and the length of the string table. */
|
|
syms_off = fhdr.pointer_to_symbol_table;
|
|
syms_size = syms_num * SYM_SZ;
|
|
|
|
if (!backtrace_get_view (state, descriptor, syms_off, syms_size + 4,
|
|
error_callback, data, &syms_view))
|
|
goto fail;
|
|
syms_view_valid = 1;
|
|
|
|
str_size = coff_read4 (syms_view.data + syms_size);
|
|
|
|
str_off = syms_off + syms_size;
|
|
|
|
if (str_size > 4)
|
|
{
|
|
/* Map string table (including the length word). */
|
|
|
|
if (!backtrace_get_view (state, descriptor, str_off, str_size,
|
|
error_callback, data, &str_view))
|
|
goto fail;
|
|
str_view_valid = 1;
|
|
}
|
|
}
|
|
|
|
memset (sections, 0, sizeof sections);
|
|
|
|
/* Look for the symbol table. */
|
|
for (i = 0; i < sects_num; ++i)
|
|
{
|
|
const b_coff_section_header *s = sects + i;
|
|
unsigned int str_off;
|
|
int j;
|
|
|
|
if (s->name[0] == '/')
|
|
{
|
|
/* Extended section name. */
|
|
str_off = atoi (s->name + 1);
|
|
}
|
|
else
|
|
str_off = 0;
|
|
|
|
for (j = 0; j < (int) DEBUG_MAX; ++j)
|
|
{
|
|
const char *dbg_name = debug_section_names[j];
|
|
int match;
|
|
|
|
if (str_off != 0)
|
|
match = coff_long_name_eq (dbg_name, str_off, &str_view);
|
|
else
|
|
match = coff_short_name_eq (dbg_name, s->name);
|
|
if (match)
|
|
{
|
|
sections[j].offset = s->pointer_to_raw_data;
|
|
sections[j].size = s->virtual_size <= s->size_of_raw_data ?
|
|
s->virtual_size : s->size_of_raw_data;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (syms_num != 0)
|
|
{
|
|
struct coff_syminfo_data *sdata;
|
|
|
|
sdata = ((struct coff_syminfo_data *)
|
|
backtrace_alloc (state, sizeof *sdata, error_callback, data));
|
|
if (sdata == NULL)
|
|
goto fail;
|
|
|
|
if (!coff_initialize_syminfo (state, image_base, is_64,
|
|
sects, sects_num,
|
|
syms_view.data, syms_size,
|
|
str_view.data, str_size,
|
|
error_callback, data, sdata))
|
|
{
|
|
backtrace_free (state, sdata, sizeof *sdata, error_callback, data);
|
|
goto fail;
|
|
}
|
|
|
|
*found_sym = 1;
|
|
|
|
coff_add_syminfo_data (state, sdata);
|
|
}
|
|
|
|
backtrace_release_view (state, §s_view, error_callback, data);
|
|
sects_view_valid = 0;
|
|
if (syms_view_valid)
|
|
{
|
|
backtrace_release_view (state, &syms_view, error_callback, data);
|
|
syms_view_valid = 0;
|
|
}
|
|
|
|
/* Read all the debug sections in a single view, since they are
|
|
probably adjacent in the file. 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)
|
|
continue;
|
|
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 (min_offset == 0 || max_offset == 0)
|
|
{
|
|
if (!backtrace_close (descriptor, error_callback, data))
|
|
goto fail;
|
|
*fileline_fn = coff_nodebug;
|
|
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;
|
|
|
|
for (i = 0; i < (int) DEBUG_MAX; ++i)
|
|
{
|
|
size_t size = sections[i].size;
|
|
dwarf_sections.size[i] = size;
|
|
if (size == 0)
|
|
dwarf_sections.data[i] = NULL;
|
|
else
|
|
dwarf_sections.data[i] = ((const unsigned char *) debug_view.data
|
|
+ (sections[i].offset - min_offset));
|
|
}
|
|
|
|
if (!backtrace_dwarf_add (state, /* base_address */ 0, &dwarf_sections,
|
|
0, /* FIXME: is_bigendian */
|
|
NULL, /* altlink */
|
|
error_callback, data, fileline_fn,
|
|
NULL /* returned fileline_entry */))
|
|
goto fail;
|
|
|
|
*found_dwarf = 1;
|
|
|
|
return 1;
|
|
|
|
fail:
|
|
if (sects_view_valid)
|
|
backtrace_release_view (state, §s_view, error_callback, data);
|
|
if (str_view_valid)
|
|
backtrace_release_view (state, &str_view, error_callback, data);
|
|
if (syms_view_valid)
|
|
backtrace_release_view (state, &syms_view, error_callback, data);
|
|
if (debug_view_valid)
|
|
backtrace_release_view (state, &debug_view, error_callback, data);
|
|
if (descriptor != -1)
|
|
backtrace_close (descriptor, error_callback, data);
|
|
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 ATTRIBUTE_UNUSED, int descriptor,
|
|
backtrace_error_callback error_callback,
|
|
void *data, fileline *fileline_fn)
|
|
{
|
|
int ret;
|
|
int found_sym;
|
|
int found_dwarf;
|
|
fileline coff_fileline_fn;
|
|
|
|
ret = coff_add (state, descriptor, error_callback, data,
|
|
&coff_fileline_fn, &found_sym, &found_dwarf);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
if (!state->threaded)
|
|
{
|
|
if (found_sym)
|
|
state->syminfo_fn = coff_syminfo;
|
|
else if (state->syminfo_fn == NULL)
|
|
state->syminfo_fn = coff_nosyms;
|
|
}
|
|
else
|
|
{
|
|
if (found_sym)
|
|
backtrace_atomic_store_pointer (&state->syminfo_fn, coff_syminfo);
|
|
else
|
|
(void) __sync_bool_compare_and_swap (&state->syminfo_fn, NULL,
|
|
coff_nosyms);
|
|
}
|
|
|
|
if (!state->threaded)
|
|
{
|
|
if (state->fileline_fn == NULL || state->fileline_fn == coff_nodebug)
|
|
*fileline_fn = coff_fileline_fn;
|
|
}
|
|
else
|
|
{
|
|
fileline current_fn;
|
|
|
|
current_fn = backtrace_atomic_load_pointer (&state->fileline_fn);
|
|
if (current_fn == NULL || current_fn == coff_nodebug)
|
|
*fileline_fn = coff_fileline_fn;
|
|
}
|
|
|
|
return 1;
|
|
}
|