mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-11-30 07:20:41 +00:00
dc810e3900
o bfd_read and bfd_write lose an unnecessary param and become
bfd_bread and bfd_bwrite.
o bfd_*alloc now all take a bfd_size_type arg, and will error if
size_t is too small. eg. 32 bit host, 64 bit bfd, verrry big files
or bugs in linker scripts etc.
o file_ptr becomes a bfd_signed_vma. Besides matching sizes with
various other types involved in handling sections, this should make
it easier for bfd to support a 64 bit off_t on 32 bit hosts that
provide it.
o I've made the H_GET_* and H_PUT_* macros (which invoke bfd_h_{get,put}_*)
generally available. They now cast their args to bfd_vma and
bfd_byte * as appropriate, which removes a swag of casts from the
source.
o Bug fixes to bfd_get8, aix386_core_vec, elf32_h8_relax_section, and
aout-encap.c.
o Zillions of formatting and -Wconversion fixes.
1801 lines
48 KiB
C
1801 lines
48 KiB
C
/* DWARF 2 support.
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Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
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Free Software Foundation, Inc.
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Adapted from gdb/dwarf2read.c by Gavin Koch of Cygnus Solutions
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(gavin@cygnus.com).
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From the dwarf2read.c header:
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Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
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Inc. with support from Florida State University (under contract
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with the Ada Joint Program Office), and Silicon Graphics, Inc.
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Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
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based on Fred Fish's (Cygnus Support) implementation of DWARF 1
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support in dwarfread.c
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This file is part of BFD.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "libiberty.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/dwarf2.h"
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/* The data in the .debug_line statement prologue looks like this. */
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struct line_head
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{
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unsigned int total_length;
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unsigned short version;
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unsigned int prologue_length;
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unsigned char minimum_instruction_length;
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unsigned char default_is_stmt;
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int line_base;
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unsigned char line_range;
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unsigned char opcode_base;
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unsigned char *standard_opcode_lengths;
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};
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/* Attributes have a name and a value. */
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struct attribute
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{
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enum dwarf_attribute name;
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enum dwarf_form form;
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union
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{
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char *str;
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struct dwarf_block *blk;
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unsigned int unsnd;
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int snd;
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bfd_vma addr;
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}
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u;
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};
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/* Get at parts of an attribute structure. */
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#define DW_STRING(attr) ((attr)->u.str)
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#define DW_UNSND(attr) ((attr)->u.unsnd)
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#define DW_BLOCK(attr) ((attr)->u.blk)
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#define DW_SND(attr) ((attr)->u.snd)
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#define DW_ADDR(attr) ((attr)->u.addr)
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/* Blocks are a bunch of untyped bytes. */
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struct dwarf_block
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{
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unsigned int size;
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char *data;
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};
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struct dwarf2_debug
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{
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/* A list of all previously read comp_units. */
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struct comp_unit* all_comp_units;
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/* The next unread compilation unit within the .debug_info section.
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Zero indicates that the .debug_info section has not been loaded
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into a buffer yet. */
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char* info_ptr;
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/* Pointer to the end of the .debug_info section memory buffer. */
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char* info_ptr_end;
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/* Pointer to the section and address of the beginning of the
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section. */
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asection* sec;
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char* sec_info_ptr;
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/* Pointer to the symbol table. */
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asymbol** syms;
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/* Pointer to the .debug_abbrev section loaded into memory. */
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char* dwarf_abbrev_buffer;
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/* Length of the loaded .debug_abbrev section. */
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unsigned long dwarf_abbrev_size;
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/* Buffer for decode_line_info. */
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char *dwarf_line_buffer;
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/* Length of the loaded .debug_line section. */
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unsigned long dwarf_line_size;
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};
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struct arange
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{
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struct arange *next;
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bfd_vma low;
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bfd_vma high;
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};
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/* A minimal decoding of DWARF2 compilation units. We only decode
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what's needed to get to the line number information. */
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struct comp_unit
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{
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/* Chain the previously read compilation units. */
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struct comp_unit* next_unit;
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/* Keep the bdf convenient (for memory allocation). */
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bfd* abfd;
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/* The lowest and higest addresses contained in this compilation
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unit as specified in the compilation unit header. */
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struct arange arange;
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/* The DW_AT_name attribute (for error messages). */
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char* name;
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/* The abbrev hash table. */
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struct abbrev_info** abbrevs;
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/* Note that an error was found by comp_unit_find_nearest_line. */
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int error;
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/* The DW_AT_comp_dir attribute. */
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char* comp_dir;
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/* True if there is a line number table associated with this comp. unit. */
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int stmtlist;
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/* The offset into .debug_line of the line number table. */
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unsigned long line_offset;
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/* Pointer to the first child die for the comp unit. */
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char *first_child_die_ptr;
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/* The end of the comp unit. */
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char *end_ptr;
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/* The decoded line number, NULL if not yet decoded. */
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struct line_info_table* line_table;
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/* A list of the functions found in this comp. unit. */
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struct funcinfo* function_table;
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/* Address size for this unit - from unit header. */
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unsigned char addr_size;
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};
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/* This data structure holds the information of an abbrev. */
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struct abbrev_info
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{
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unsigned int number; /* Number identifying abbrev. */
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enum dwarf_tag tag; /* DWARF tag. */
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int has_children; /* Boolean. */
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unsigned int num_attrs; /* Number of attributes. */
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struct attr_abbrev *attrs; /* An array of attribute descriptions. */
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struct abbrev_info *next; /* Next in chain. */
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};
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struct attr_abbrev
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{
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enum dwarf_attribute name;
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enum dwarf_form form;
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};
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#ifndef ABBREV_HASH_SIZE
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#define ABBREV_HASH_SIZE 121
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#endif
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#ifndef ATTR_ALLOC_CHUNK
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#define ATTR_ALLOC_CHUNK 4
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#endif
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static unsigned int read_1_byte PARAMS ((bfd *, char *));
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static int read_1_signed_byte PARAMS ((bfd *, char *));
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static unsigned int read_2_bytes PARAMS ((bfd *, char *));
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static unsigned int read_4_bytes PARAMS ((bfd *, char *));
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static unsigned int read_8_bytes PARAMS ((bfd *, char *));
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static char *read_n_bytes PARAMS ((bfd *, char *, unsigned int));
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static char *read_string PARAMS ((bfd *, char *, unsigned int *));
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static unsigned int read_unsigned_leb128
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PARAMS ((bfd *, char *, unsigned int *));
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static int read_signed_leb128
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PARAMS ((bfd *, char *, unsigned int *));
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static bfd_vma read_address PARAMS ((struct comp_unit *, char *));
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static struct abbrev_info *lookup_abbrev
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PARAMS ((unsigned int, struct abbrev_info **));
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static struct abbrev_info **read_abbrevs
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PARAMS ((bfd *, unsigned int, struct dwarf2_debug *));
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static char *read_attribute
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PARAMS ((struct attribute *, struct attr_abbrev *,
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struct comp_unit *, char *));
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static void add_line_info
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PARAMS ((struct line_info_table *, bfd_vma, char *,
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unsigned int, unsigned int, int));
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static char *concat_filename PARAMS ((struct line_info_table *, unsigned int));
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static void arange_add PARAMS ((struct comp_unit *, bfd_vma, bfd_vma));
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static struct line_info_table *decode_line_info
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PARAMS ((struct comp_unit *, struct dwarf2_debug *));
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static boolean lookup_address_in_line_info_table
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PARAMS ((struct line_info_table *, bfd_vma, const char **, unsigned int *));
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static boolean lookup_address_in_function_table
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PARAMS ((struct funcinfo *, bfd_vma, const char **));
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static boolean scan_unit_for_functions PARAMS ((struct comp_unit *));
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static bfd_vma find_rela_addend
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PARAMS ((bfd *, asection *, bfd_size_type, asymbol**));
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static struct comp_unit *parse_comp_unit
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PARAMS ((bfd *, struct dwarf2_debug *, bfd_vma, unsigned int));
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static boolean comp_unit_contains_address
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PARAMS ((struct comp_unit *, bfd_vma));
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static boolean comp_unit_find_nearest_line
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PARAMS ((struct comp_unit *, bfd_vma, const char **, const char **,
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unsigned int *, struct dwarf2_debug *));
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static asection *find_debug_info PARAMS ((bfd *, asection *));
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/* VERBATIM
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The following function up to the END VERBATIM mark are
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copied directly from dwarf2read.c. */
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/* Read dwarf information from a buffer. */
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static unsigned int
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read_1_byte (abfd, buf)
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bfd *abfd ATTRIBUTE_UNUSED;
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char *buf;
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{
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return bfd_get_8 (abfd, (bfd_byte *) buf);
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}
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static int
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read_1_signed_byte (abfd, buf)
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bfd *abfd ATTRIBUTE_UNUSED;
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char *buf;
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{
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return bfd_get_signed_8 (abfd, (bfd_byte *) buf);
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}
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static unsigned int
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read_2_bytes (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_16 (abfd, (bfd_byte *) buf);
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}
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#if 0 /* This is not used. */
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static int
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read_2_signed_bytes (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_signed_16 (abfd, (bfd_byte *) buf);
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}
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#endif
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static unsigned int
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read_4_bytes (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_32 (abfd, (bfd_byte *) buf);
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}
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#if 0 /* This is not used. */
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static int
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read_4_signed_bytes (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_signed_32 (abfd, (bfd_byte *) buf);
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}
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#endif
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static unsigned int
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read_8_bytes (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_64 (abfd, (bfd_byte *) buf);
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}
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static char *
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read_n_bytes (abfd, buf, size)
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bfd *abfd ATTRIBUTE_UNUSED;
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char *buf;
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unsigned int size ATTRIBUTE_UNUSED;
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{
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/* If the size of a host char is 8 bits, we can return a pointer
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to the buffer, otherwise we have to copy the data to a buffer
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allocated on the temporary obstack. */
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return buf;
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}
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static char *
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read_string (abfd, buf, bytes_read_ptr)
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bfd *abfd ATTRIBUTE_UNUSED;
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char *buf;
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unsigned int *bytes_read_ptr;
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{
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/* If the size of a host char is 8 bits, we can return a pointer
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to the string, otherwise we have to copy the string to a buffer
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allocated on the temporary obstack. */
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if (*buf == '\0')
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{
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*bytes_read_ptr = 1;
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return NULL;
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}
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*bytes_read_ptr = strlen (buf) + 1;
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return buf;
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}
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static unsigned int
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read_unsigned_leb128 (abfd, buf, bytes_read_ptr)
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bfd *abfd ATTRIBUTE_UNUSED;
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char *buf;
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unsigned int *bytes_read_ptr;
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{
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unsigned int result;
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unsigned int num_read;
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int shift;
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unsigned char byte;
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result = 0;
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shift = 0;
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num_read = 0;
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do
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{
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byte = bfd_get_8 (abfd, (bfd_byte *) buf);
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buf ++;
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num_read ++;
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result |= ((byte & 0x7f) << shift);
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shift += 7;
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}
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while (byte & 0x80);
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* bytes_read_ptr = num_read;
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return result;
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}
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static int
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read_signed_leb128 (abfd, buf, bytes_read_ptr)
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bfd *abfd ATTRIBUTE_UNUSED;
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char *buf;
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unsigned int * bytes_read_ptr;
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{
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int result;
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int shift;
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int num_read;
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unsigned char byte;
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result = 0;
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shift = 0;
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num_read = 0;
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do
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{
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byte = bfd_get_8 (abfd, (bfd_byte *) buf);
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buf ++;
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num_read ++;
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result |= ((byte & 0x7f) << shift);
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shift += 7;
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}
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while (byte & 0x80);
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if ((shift < 32) && (byte & 0x40))
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result |= -(1 << shift);
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* bytes_read_ptr = num_read;
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return result;
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}
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/* END VERBATIM */
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static bfd_vma
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read_address (unit, buf)
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struct comp_unit* unit;
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char *buf;
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{
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switch (unit->addr_size)
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{
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case 8:
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return bfd_get_64 (unit->abfd, (bfd_byte *) buf);
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case 4:
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return bfd_get_32 (unit->abfd, (bfd_byte *) buf);
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case 2:
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return bfd_get_16 (unit->abfd, (bfd_byte *) buf);
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default:
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abort ();
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}
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}
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/* Lookup an abbrev_info structure in the abbrev hash table. */
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static struct abbrev_info *
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lookup_abbrev (number,abbrevs)
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unsigned int number;
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struct abbrev_info **abbrevs;
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{
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unsigned int hash_number;
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struct abbrev_info *abbrev;
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hash_number = number % ABBREV_HASH_SIZE;
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abbrev = abbrevs[hash_number];
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while (abbrev)
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{
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if (abbrev->number == number)
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return abbrev;
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else
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abbrev = abbrev->next;
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}
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return NULL;
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}
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|
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/* In DWARF version 2, the description of the debugging information is
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stored in a separate .debug_abbrev section. Before we read any
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dies from a section we read in all abbreviations and install them
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in a hash table. */
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|
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static struct abbrev_info**
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read_abbrevs (abfd, offset, stash)
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bfd * abfd;
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unsigned int offset;
|
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struct dwarf2_debug *stash;
|
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{
|
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struct abbrev_info **abbrevs;
|
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char *abbrev_ptr;
|
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struct abbrev_info *cur_abbrev;
|
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unsigned int abbrev_number, bytes_read, abbrev_name;
|
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unsigned int abbrev_form, hash_number;
|
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bfd_size_type amt;
|
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|
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if (! stash->dwarf_abbrev_buffer)
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|
{
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asection *msec;
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|
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msec = bfd_get_section_by_name (abfd, ".debug_abbrev");
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if (! msec)
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{
|
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(*_bfd_error_handler) (_("Dwarf Error: Can't find .debug_abbrev section."));
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bfd_set_error (bfd_error_bad_value);
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return 0;
|
|
}
|
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|
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stash->dwarf_abbrev_size = msec->_raw_size;
|
|
stash->dwarf_abbrev_buffer = (char*) bfd_alloc (abfd, msec->_raw_size);
|
|
if (! stash->dwarf_abbrev_buffer)
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return 0;
|
|
|
|
if (! bfd_get_section_contents (abfd, msec, stash->dwarf_abbrev_buffer,
|
|
(bfd_vma) 0, msec->_raw_size))
|
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return 0;
|
|
}
|
|
|
|
if (offset >= stash->dwarf_abbrev_size)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: Abbrev offset (%u) greater than or equal to abbrev size (%u)."),
|
|
offset, stash->dwarf_abbrev_size );
|
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bfd_set_error (bfd_error_bad_value);
|
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return 0;
|
|
}
|
|
|
|
amt = sizeof (struct abbrev_info*) * ABBREV_HASH_SIZE;
|
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abbrevs = (struct abbrev_info**) bfd_zalloc (abfd, amt);
|
|
|
|
abbrev_ptr = stash->dwarf_abbrev_buffer + offset;
|
|
abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
|
|
abbrev_ptr += bytes_read;
|
|
|
|
/* Loop until we reach an abbrev number of 0. */
|
|
while (abbrev_number)
|
|
{
|
|
amt = sizeof (struct abbrev_info);
|
|
cur_abbrev = (struct abbrev_info *) bfd_zalloc (abfd, amt);
|
|
|
|
/* Read in abbrev header. */
|
|
cur_abbrev->number = abbrev_number;
|
|
cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
|
|
abbrev_ptr += bytes_read;
|
|
cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
|
|
abbrev_ptr += 1;
|
|
|
|
/* Now read in declarations. */
|
|
abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
|
|
abbrev_ptr += bytes_read;
|
|
abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
|
|
abbrev_ptr += bytes_read;
|
|
|
|
while (abbrev_name)
|
|
{
|
|
if ((cur_abbrev->num_attrs % ATTR_ALLOC_CHUNK) == 0)
|
|
{
|
|
amt = cur_abbrev->num_attrs + ATTR_ALLOC_CHUNK;
|
|
amt *= sizeof (struct attr_abbrev);
|
|
cur_abbrev->attrs = ((struct attr_abbrev *)
|
|
bfd_realloc (cur_abbrev->attrs, amt));
|
|
if (! cur_abbrev->attrs)
|
|
return 0;
|
|
}
|
|
|
|
cur_abbrev->attrs[cur_abbrev->num_attrs].name = abbrev_name;
|
|
cur_abbrev->attrs[cur_abbrev->num_attrs++].form = abbrev_form;
|
|
abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
|
|
abbrev_ptr += bytes_read;
|
|
abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
|
|
abbrev_ptr += bytes_read;
|
|
}
|
|
|
|
hash_number = abbrev_number % ABBREV_HASH_SIZE;
|
|
cur_abbrev->next = abbrevs[hash_number];
|
|
abbrevs[hash_number] = cur_abbrev;
|
|
|
|
/* Get next abbreviation.
|
|
Under Irix6 the abbreviations for a compilation unit are not
|
|
always properly terminated with an abbrev number of 0.
|
|
Exit loop if we encounter an abbreviation which we have
|
|
already read (which means we are about to read the abbreviations
|
|
for the next compile unit) or if the end of the abbreviation
|
|
table is reached. */
|
|
if ((unsigned int) (abbrev_ptr - stash->dwarf_abbrev_buffer)
|
|
>= stash->dwarf_abbrev_size)
|
|
break;
|
|
abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
|
|
abbrev_ptr += bytes_read;
|
|
if (lookup_abbrev (abbrev_number,abbrevs) != NULL)
|
|
break;
|
|
}
|
|
|
|
return abbrevs;
|
|
}
|
|
|
|
/* Read an attribute described by an abbreviated attribute. */
|
|
|
|
static char *
|
|
read_attribute (attr, abbrev, unit, info_ptr)
|
|
struct attribute *attr;
|
|
struct attr_abbrev *abbrev;
|
|
struct comp_unit *unit;
|
|
char *info_ptr;
|
|
{
|
|
bfd *abfd = unit->abfd;
|
|
unsigned int bytes_read;
|
|
struct dwarf_block *blk;
|
|
bfd_size_type amt;
|
|
|
|
attr->name = abbrev->name;
|
|
attr->form = abbrev->form;
|
|
|
|
switch (abbrev->form)
|
|
{
|
|
case DW_FORM_addr:
|
|
case DW_FORM_ref_addr:
|
|
DW_ADDR (attr) = read_address (unit, info_ptr);
|
|
info_ptr += unit->addr_size;
|
|
break;
|
|
case DW_FORM_block2:
|
|
amt = sizeof (struct dwarf_block);
|
|
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
|
|
blk->size = read_2_bytes (abfd, info_ptr);
|
|
info_ptr += 2;
|
|
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
|
|
info_ptr += blk->size;
|
|
DW_BLOCK (attr) = blk;
|
|
break;
|
|
case DW_FORM_block4:
|
|
amt = sizeof (struct dwarf_block);
|
|
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
|
|
blk->size = read_4_bytes (abfd, info_ptr);
|
|
info_ptr += 4;
|
|
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
|
|
info_ptr += blk->size;
|
|
DW_BLOCK (attr) = blk;
|
|
break;
|
|
case DW_FORM_data2:
|
|
DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
|
|
info_ptr += 2;
|
|
break;
|
|
case DW_FORM_data4:
|
|
DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
|
|
info_ptr += 4;
|
|
break;
|
|
case DW_FORM_data8:
|
|
DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
|
|
info_ptr += 8;
|
|
break;
|
|
case DW_FORM_string:
|
|
DW_STRING (attr) = read_string (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
break;
|
|
case DW_FORM_block:
|
|
amt = sizeof (struct dwarf_block);
|
|
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
|
|
blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
|
|
info_ptr += blk->size;
|
|
DW_BLOCK (attr) = blk;
|
|
break;
|
|
case DW_FORM_block1:
|
|
amt = sizeof (struct dwarf_block);
|
|
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
|
|
blk->size = read_1_byte (abfd, info_ptr);
|
|
info_ptr += 1;
|
|
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
|
|
info_ptr += blk->size;
|
|
DW_BLOCK (attr) = blk;
|
|
break;
|
|
case DW_FORM_data1:
|
|
DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
|
|
info_ptr += 1;
|
|
break;
|
|
case DW_FORM_flag:
|
|
DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
|
|
info_ptr += 1;
|
|
break;
|
|
case DW_FORM_sdata:
|
|
DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
break;
|
|
case DW_FORM_udata:
|
|
DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
break;
|
|
case DW_FORM_ref1:
|
|
DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
|
|
info_ptr += 1;
|
|
break;
|
|
case DW_FORM_ref2:
|
|
DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
|
|
info_ptr += 2;
|
|
break;
|
|
case DW_FORM_ref4:
|
|
DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
|
|
info_ptr += 4;
|
|
break;
|
|
case DW_FORM_ref8:
|
|
DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
|
|
info_ptr += 8;
|
|
break;
|
|
case DW_FORM_ref_udata:
|
|
DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
break;
|
|
case DW_FORM_strp:
|
|
case DW_FORM_indirect:
|
|
default:
|
|
(*_bfd_error_handler) (_("Dwarf Error: Invalid or unhandled FORM value: %d."),
|
|
abbrev->form);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
}
|
|
return info_ptr;
|
|
}
|
|
|
|
/* Source line information table routines. */
|
|
|
|
#define FILE_ALLOC_CHUNK 5
|
|
#define DIR_ALLOC_CHUNK 5
|
|
|
|
struct line_info
|
|
{
|
|
struct line_info* prev_line;
|
|
bfd_vma address;
|
|
char* filename;
|
|
unsigned int line;
|
|
unsigned int column;
|
|
int end_sequence; /* End of (sequential) code sequence. */
|
|
};
|
|
|
|
struct fileinfo
|
|
{
|
|
char *name;
|
|
unsigned int dir;
|
|
unsigned int time;
|
|
unsigned int size;
|
|
};
|
|
|
|
struct line_info_table
|
|
{
|
|
bfd* abfd;
|
|
unsigned int num_files;
|
|
unsigned int num_dirs;
|
|
char* comp_dir;
|
|
char** dirs;
|
|
struct fileinfo* files;
|
|
struct line_info* last_line;
|
|
};
|
|
|
|
static void
|
|
add_line_info (table, address, filename, line, column, end_sequence)
|
|
struct line_info_table* table;
|
|
bfd_vma address;
|
|
char* filename;
|
|
unsigned int line;
|
|
unsigned int column;
|
|
int end_sequence;
|
|
{
|
|
bfd_size_type amt = sizeof (struct line_info);
|
|
struct line_info* info = (struct line_info*) bfd_alloc (table->abfd, amt);
|
|
|
|
info->prev_line = table->last_line;
|
|
table->last_line = info;
|
|
|
|
info->address = address;
|
|
info->filename = filename;
|
|
info->line = line;
|
|
info->column = column;
|
|
info->end_sequence = end_sequence;
|
|
}
|
|
|
|
static char *
|
|
concat_filename (table, file)
|
|
struct line_info_table* table;
|
|
unsigned int file;
|
|
{
|
|
char* filename;
|
|
|
|
if (file - 1 >= table->num_files)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("Dwarf Error: mangled line number section (bad file number)."));
|
|
return "<unknown>";
|
|
}
|
|
|
|
filename = table->files[file - 1].name;
|
|
if (IS_ABSOLUTE_PATH(filename))
|
|
return filename;
|
|
|
|
else
|
|
{
|
|
char* dirname = (table->files[file - 1].dir
|
|
? table->dirs[table->files[file - 1].dir - 1]
|
|
: table->comp_dir);
|
|
return (char*) concat (dirname, "/", filename, NULL);
|
|
}
|
|
}
|
|
|
|
static void
|
|
arange_add (unit, low_pc, high_pc)
|
|
struct comp_unit *unit;
|
|
bfd_vma low_pc;
|
|
bfd_vma high_pc;
|
|
{
|
|
struct arange *arange;
|
|
|
|
/* First see if we can cheaply extend an existing range. */
|
|
arange = &unit->arange;
|
|
|
|
do
|
|
{
|
|
if (low_pc == arange->high)
|
|
{
|
|
arange->high = high_pc;
|
|
return;
|
|
}
|
|
if (high_pc == arange->low)
|
|
{
|
|
arange->low = low_pc;
|
|
return;
|
|
}
|
|
arange = arange->next;
|
|
}
|
|
while (arange);
|
|
|
|
if (unit->arange.high == 0)
|
|
{
|
|
/* This is the first address range: store it in unit->arange. */
|
|
unit->arange.next = 0;
|
|
unit->arange.low = low_pc;
|
|
unit->arange.high = high_pc;
|
|
return;
|
|
}
|
|
|
|
/* Need to allocate a new arange and insert it into the arange list. */
|
|
arange = bfd_zalloc (unit->abfd, (bfd_size_type) sizeof (*arange));
|
|
arange->low = low_pc;
|
|
arange->high = high_pc;
|
|
|
|
arange->next = unit->arange.next;
|
|
unit->arange.next = arange;
|
|
}
|
|
|
|
/* Decode the line number information for UNIT. */
|
|
|
|
static struct line_info_table*
|
|
decode_line_info (unit, stash)
|
|
struct comp_unit *unit;
|
|
struct dwarf2_debug *stash;
|
|
{
|
|
bfd *abfd = unit->abfd;
|
|
struct line_info_table* table;
|
|
char *line_ptr;
|
|
char *line_end;
|
|
struct line_head lh;
|
|
unsigned int i, bytes_read;
|
|
char *cur_file, *cur_dir;
|
|
unsigned char op_code, extended_op, adj_opcode;
|
|
bfd_size_type amt;
|
|
|
|
if (! stash->dwarf_line_buffer)
|
|
{
|
|
asection *msec;
|
|
|
|
msec = bfd_get_section_by_name (abfd, ".debug_line");
|
|
if (! msec)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: Can't find .debug_line section."));
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
stash->dwarf_line_size = msec->_raw_size;
|
|
stash->dwarf_line_buffer = (char *) bfd_alloc (abfd, msec->_raw_size);
|
|
if (! stash->dwarf_line_buffer)
|
|
return 0;
|
|
|
|
if (! bfd_get_section_contents (abfd, msec, stash->dwarf_line_buffer,
|
|
(bfd_vma) 0, msec->_raw_size))
|
|
return 0;
|
|
|
|
/* FIXME: We ought to apply the relocs against this section before
|
|
we process it... */
|
|
}
|
|
|
|
/* Since we are using un-relocated data, it is possible to get a bad value
|
|
for the line_offset. Validate it here so that we won't get a segfault
|
|
below. */
|
|
if (unit->line_offset >= stash->dwarf_line_size)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: Line offset (%u) greater than or equal to line size (%u)."),
|
|
unit->line_offset, stash->dwarf_line_size);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
amt = sizeof (struct line_info_table);
|
|
table = (struct line_info_table*) bfd_alloc (abfd, amt);
|
|
table->abfd = abfd;
|
|
table->comp_dir = unit->comp_dir;
|
|
|
|
table->num_files = 0;
|
|
table->files = NULL;
|
|
|
|
table->num_dirs = 0;
|
|
table->dirs = NULL;
|
|
|
|
table->files = NULL;
|
|
table->last_line = NULL;
|
|
|
|
line_ptr = stash->dwarf_line_buffer + unit->line_offset;
|
|
|
|
/* Read in the prologue. */
|
|
lh.total_length = read_4_bytes (abfd, line_ptr);
|
|
line_ptr += 4;
|
|
line_end = line_ptr + lh.total_length;
|
|
lh.version = read_2_bytes (abfd, line_ptr);
|
|
line_ptr += 2;
|
|
lh.prologue_length = read_4_bytes (abfd, line_ptr);
|
|
line_ptr += 4;
|
|
lh.minimum_instruction_length = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
lh.default_is_stmt = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
lh.line_base = read_1_signed_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
lh.line_range = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
lh.opcode_base = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
amt = lh.opcode_base * sizeof (unsigned char);
|
|
lh.standard_opcode_lengths = (unsigned char *) bfd_alloc (abfd, amt);
|
|
|
|
lh.standard_opcode_lengths[0] = 1;
|
|
|
|
for (i = 1; i < lh.opcode_base; ++i)
|
|
{
|
|
lh.standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
}
|
|
|
|
/* Read directory table. */
|
|
while ((cur_dir = read_string (abfd, line_ptr, &bytes_read)) != NULL)
|
|
{
|
|
line_ptr += bytes_read;
|
|
|
|
if ((table->num_dirs % DIR_ALLOC_CHUNK) == 0)
|
|
{
|
|
amt = table->num_dirs + DIR_ALLOC_CHUNK;
|
|
amt *= sizeof (char *);
|
|
table->dirs = (char **) bfd_realloc (table->dirs, amt);
|
|
if (! table->dirs)
|
|
return 0;
|
|
}
|
|
|
|
table->dirs[table->num_dirs++] = cur_dir;
|
|
}
|
|
|
|
line_ptr += bytes_read;
|
|
|
|
/* Read file name table. */
|
|
while ((cur_file = read_string (abfd, line_ptr, &bytes_read)) != NULL)
|
|
{
|
|
line_ptr += bytes_read;
|
|
|
|
if ((table->num_files % FILE_ALLOC_CHUNK) == 0)
|
|
{
|
|
amt = table->num_files + FILE_ALLOC_CHUNK;
|
|
amt *= sizeof (struct fileinfo);
|
|
table->files = (struct fileinfo *) bfd_realloc (table->files, amt);
|
|
if (! table->files)
|
|
return 0;
|
|
}
|
|
|
|
table->files[table->num_files].name = cur_file;
|
|
table->files[table->num_files].dir =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->files[table->num_files].time =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->files[table->num_files].size =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->num_files++;
|
|
}
|
|
|
|
line_ptr += bytes_read;
|
|
|
|
/* Read the statement sequences until there's nothing left. */
|
|
while (line_ptr < line_end)
|
|
{
|
|
/* State machine registers. */
|
|
bfd_vma address = 0;
|
|
char* filename = concat_filename (table, 1);
|
|
unsigned int line = 1;
|
|
unsigned int column = 0;
|
|
int is_stmt = lh.default_is_stmt;
|
|
int basic_block = 0;
|
|
int end_sequence = 0, need_low_pc = 1;
|
|
bfd_vma low_pc = 0;
|
|
|
|
/* Decode the table. */
|
|
while (! end_sequence)
|
|
{
|
|
op_code = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
|
|
switch (op_code)
|
|
{
|
|
case DW_LNS_extended_op:
|
|
line_ptr += 1; /* Ignore length. */
|
|
extended_op = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
switch (extended_op)
|
|
{
|
|
case DW_LNE_end_sequence:
|
|
end_sequence = 1;
|
|
add_line_info (table, address, filename, line, column,
|
|
end_sequence);
|
|
if (need_low_pc)
|
|
{
|
|
need_low_pc = 0;
|
|
low_pc = address;
|
|
}
|
|
arange_add (unit, low_pc, address);
|
|
break;
|
|
case DW_LNE_set_address:
|
|
address = read_address (unit, line_ptr);
|
|
line_ptr += unit->addr_size;
|
|
break;
|
|
case DW_LNE_define_file:
|
|
cur_file = read_string (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
if ((table->num_files % FILE_ALLOC_CHUNK) == 0)
|
|
{
|
|
amt = table->num_files + FILE_ALLOC_CHUNK;
|
|
amt *= sizeof (struct fileinfo);
|
|
table->files =
|
|
(struct fileinfo *) bfd_realloc (table->files, amt);
|
|
if (! table->files)
|
|
return 0;
|
|
}
|
|
table->files[table->num_files].name = cur_file;
|
|
table->files[table->num_files].dir =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->files[table->num_files].time =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->files[table->num_files].size =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->num_files++;
|
|
break;
|
|
default:
|
|
(*_bfd_error_handler) (_("Dwarf Error: mangled line number section."));
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
break;
|
|
case DW_LNS_copy:
|
|
add_line_info (table, address, filename, line, column, 0);
|
|
basic_block = 0;
|
|
if (need_low_pc)
|
|
{
|
|
need_low_pc = 0;
|
|
low_pc = address;
|
|
}
|
|
break;
|
|
case DW_LNS_advance_pc:
|
|
address += lh.minimum_instruction_length
|
|
* read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
break;
|
|
case DW_LNS_advance_line:
|
|
line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
break;
|
|
case DW_LNS_set_file:
|
|
{
|
|
unsigned int file;
|
|
|
|
/* The file and directory tables are 0 based, the references
|
|
are 1 based. */
|
|
file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
filename = concat_filename (table, file);
|
|
break;
|
|
}
|
|
case DW_LNS_set_column:
|
|
column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
break;
|
|
case DW_LNS_negate_stmt:
|
|
is_stmt = (!is_stmt);
|
|
break;
|
|
case DW_LNS_set_basic_block:
|
|
basic_block = 1;
|
|
break;
|
|
case DW_LNS_const_add_pc:
|
|
address += lh.minimum_instruction_length
|
|
* ((255 - lh.opcode_base) / lh.line_range);
|
|
break;
|
|
case DW_LNS_fixed_advance_pc:
|
|
address += read_2_bytes (abfd, line_ptr);
|
|
line_ptr += 2;
|
|
break;
|
|
default: /* Special operand. */
|
|
adj_opcode = op_code - lh.opcode_base;
|
|
address += (adj_opcode / lh.line_range)
|
|
* lh.minimum_instruction_length;
|
|
line += lh.line_base + (adj_opcode % lh.line_range);
|
|
/* Append row to matrix using current values. */
|
|
add_line_info (table, address, filename, line, column, 0);
|
|
basic_block = 1;
|
|
if (need_low_pc)
|
|
{
|
|
need_low_pc = 0;
|
|
low_pc = address;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return table;
|
|
}
|
|
|
|
/* If ADDR is within TABLE set the output parameters and return true,
|
|
otherwise return false. The output parameters, FILENAME_PTR and
|
|
LINENUMBER_PTR, are pointers to the objects to be filled in. */
|
|
|
|
static boolean
|
|
lookup_address_in_line_info_table (table,
|
|
addr,
|
|
filename_ptr,
|
|
linenumber_ptr)
|
|
struct line_info_table* table;
|
|
bfd_vma addr;
|
|
const char **filename_ptr;
|
|
unsigned int *linenumber_ptr;
|
|
{
|
|
struct line_info* next_line = table->last_line;
|
|
struct line_info* each_line;
|
|
|
|
if (!next_line)
|
|
return false;
|
|
|
|
each_line = next_line->prev_line;
|
|
|
|
while (each_line && next_line)
|
|
{
|
|
if (!each_line->end_sequence
|
|
&& addr >= each_line->address && addr < next_line->address)
|
|
{
|
|
*filename_ptr = each_line->filename;
|
|
*linenumber_ptr = each_line->line;
|
|
return true;
|
|
}
|
|
next_line = each_line;
|
|
each_line = each_line->prev_line;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Function table functions. */
|
|
|
|
struct funcinfo
|
|
{
|
|
struct funcinfo *prev_func;
|
|
char* name;
|
|
bfd_vma low;
|
|
bfd_vma high;
|
|
};
|
|
|
|
/* If ADDR is within TABLE, set FUNCTIONNAME_PTR, and return true. */
|
|
|
|
static boolean
|
|
lookup_address_in_function_table (table,
|
|
addr,
|
|
functionname_ptr)
|
|
struct funcinfo* table;
|
|
bfd_vma addr;
|
|
const char **functionname_ptr;
|
|
{
|
|
struct funcinfo* each_func;
|
|
|
|
for (each_func = table;
|
|
each_func;
|
|
each_func = each_func->prev_func)
|
|
{
|
|
if (addr >= each_func->low && addr < each_func->high)
|
|
{
|
|
*functionname_ptr = each_func->name;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* DWARF2 Compilation unit functions. */
|
|
|
|
/* Scan over each die in a comp. unit looking for functions to add
|
|
to the function table. */
|
|
|
|
static boolean
|
|
scan_unit_for_functions (unit)
|
|
struct comp_unit *unit;
|
|
{
|
|
bfd *abfd = unit->abfd;
|
|
char *info_ptr = unit->first_child_die_ptr;
|
|
int nesting_level = 1;
|
|
|
|
while (nesting_level)
|
|
{
|
|
unsigned int abbrev_number, bytes_read, i;
|
|
struct abbrev_info *abbrev;
|
|
struct attribute attr;
|
|
struct funcinfo *func;
|
|
char* name = 0;
|
|
|
|
abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
|
|
if (! abbrev_number)
|
|
{
|
|
nesting_level--;
|
|
continue;
|
|
}
|
|
|
|
abbrev = lookup_abbrev (abbrev_number,unit->abbrevs);
|
|
if (! abbrev)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: Could not find abbrev number %d."),
|
|
abbrev_number);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return false;
|
|
}
|
|
|
|
if (abbrev->tag == DW_TAG_subprogram)
|
|
{
|
|
bfd_size_type amt = sizeof (struct funcinfo);
|
|
func = (struct funcinfo *) bfd_zalloc (abfd, amt);
|
|
func->prev_func = unit->function_table;
|
|
unit->function_table = func;
|
|
}
|
|
else
|
|
func = NULL;
|
|
|
|
for (i = 0; i < abbrev->num_attrs; ++i)
|
|
{
|
|
info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit, info_ptr);
|
|
|
|
if (func)
|
|
{
|
|
switch (attr.name)
|
|
{
|
|
case DW_AT_name:
|
|
|
|
name = DW_STRING (&attr);
|
|
|
|
/* Prefer DW_AT_MIPS_linkage_name over DW_AT_name. */
|
|
if (func->name == NULL)
|
|
func->name = DW_STRING (&attr);
|
|
break;
|
|
|
|
case DW_AT_MIPS_linkage_name:
|
|
func->name = DW_STRING (&attr);
|
|
break;
|
|
|
|
case DW_AT_low_pc:
|
|
func->low = DW_ADDR (&attr);
|
|
break;
|
|
|
|
case DW_AT_high_pc:
|
|
func->high = DW_ADDR (&attr);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
switch (attr.name)
|
|
{
|
|
case DW_AT_name:
|
|
name = DW_STRING (&attr);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (abbrev->has_children)
|
|
nesting_level++;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Look for a RELA relocation to be applied on OFFSET of section SEC,
|
|
and return the addend if such a relocation is found. Since this is
|
|
only used to find relocations referring to the .debug_abbrev
|
|
section, we make sure the relocation refers to this section, but
|
|
this is not strictly necessary, and it can probably be safely
|
|
removed if needed. However, it is important to note that this
|
|
function only returns the addend, it doesn't serve the purpose of
|
|
applying a generic relocation.
|
|
|
|
If no suitable relocation is found, or if it is not a real RELA
|
|
relocation, this function returns 0. */
|
|
|
|
static bfd_vma
|
|
find_rela_addend (abfd, sec, offset, syms)
|
|
bfd* abfd;
|
|
asection* sec;
|
|
bfd_size_type offset;
|
|
asymbol** syms;
|
|
{
|
|
long reloc_size = bfd_get_reloc_upper_bound (abfd, sec);
|
|
arelent **relocs = NULL;
|
|
long reloc_count, relc;
|
|
|
|
if (reloc_size <= 0)
|
|
return 0;
|
|
|
|
relocs = (arelent **) bfd_malloc ((bfd_size_type) reloc_size);
|
|
if (relocs == NULL)
|
|
return 0;
|
|
|
|
reloc_count = bfd_canonicalize_reloc (abfd, sec, relocs, syms);
|
|
|
|
if (reloc_count <= 0)
|
|
{
|
|
free (relocs);
|
|
return 0;
|
|
}
|
|
|
|
for (relc = 0; relc < reloc_count; relc++)
|
|
if (relocs[relc]->address == offset
|
|
&& (*relocs[relc]->sym_ptr_ptr)->flags & BSF_SECTION_SYM
|
|
&& strcmp ((*relocs[relc]->sym_ptr_ptr)->name,
|
|
".debug_abbrev") == 0)
|
|
{
|
|
bfd_vma addend = (relocs[relc]->howto->partial_inplace
|
|
? 0 : relocs[relc]->addend);
|
|
free (relocs);
|
|
return addend;
|
|
}
|
|
|
|
free (relocs);
|
|
return 0;
|
|
}
|
|
|
|
/* Parse a DWARF2 compilation unit starting at INFO_PTR. This
|
|
includes the compilation unit header that proceeds the DIE's, but
|
|
does not include the length field that preceeds each compilation
|
|
unit header. END_PTR points one past the end of this comp unit.
|
|
If ABBREV_LENGTH is 0, then the length of the abbreviation offset
|
|
is assumed to be four bytes. Otherwise, it it is the size given.
|
|
|
|
This routine does not read the whole compilation unit; only enough
|
|
to get to the line number information for the compilation unit. */
|
|
|
|
static struct comp_unit *
|
|
parse_comp_unit (abfd, stash, unit_length, abbrev_length)
|
|
bfd* abfd;
|
|
struct dwarf2_debug *stash;
|
|
bfd_vma unit_length;
|
|
unsigned int abbrev_length;
|
|
{
|
|
struct comp_unit* unit;
|
|
|
|
unsigned short version;
|
|
unsigned int abbrev_offset = 0;
|
|
unsigned char addr_size;
|
|
struct abbrev_info** abbrevs;
|
|
|
|
unsigned int abbrev_number, bytes_read, i;
|
|
struct abbrev_info *abbrev;
|
|
struct attribute attr;
|
|
|
|
char *info_ptr = stash->info_ptr;
|
|
char *end_ptr = info_ptr + unit_length;
|
|
bfd_size_type amt;
|
|
bfd_size_type off;
|
|
|
|
version = read_2_bytes (abfd, info_ptr);
|
|
info_ptr += 2;
|
|
BFD_ASSERT (abbrev_length == 0
|
|
|| abbrev_length == 4
|
|
|| abbrev_length == 8);
|
|
if (abbrev_length == 0 || abbrev_length == 4)
|
|
abbrev_offset = read_4_bytes (abfd, info_ptr);
|
|
else if (abbrev_length == 8)
|
|
abbrev_offset = read_8_bytes (abfd, info_ptr);
|
|
/* The abbrev offset is generally a relocation pointing to
|
|
.debug_abbrev+offset. On RELA targets, we have to find the
|
|
relocation and extract the addend to obtain the actual
|
|
abbrev_offset, so do it here. */
|
|
off = info_ptr - stash->sec_info_ptr;
|
|
abbrev_offset += find_rela_addend (abfd, stash->sec, off, stash->syms);
|
|
info_ptr += abbrev_length;
|
|
addr_size = read_1_byte (abfd, info_ptr);
|
|
info_ptr += 1;
|
|
|
|
if (version != 2)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: found dwarf version '%hu', this reader only handles version 2 information."), version );
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
if (addr_size > sizeof (bfd_vma))
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: found address size '%u', this reader can not handle sizes greater than '%u'."),
|
|
addr_size,
|
|
sizeof (bfd_vma));
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
if (addr_size != 2 && addr_size != 4 && addr_size != 8)
|
|
{
|
|
(*_bfd_error_handler) ("Dwarf Error: found address size '%u', this reader can only handle address sizes '2', '4' and '8'.", addr_size );
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
/* Read the abbrevs for this compilation unit into a table. */
|
|
abbrevs = read_abbrevs (abfd, abbrev_offset, stash);
|
|
if (! abbrevs)
|
|
return 0;
|
|
|
|
abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
if (! abbrev_number)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: Bad abbrev number: %d."),
|
|
abbrev_number);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
abbrev = lookup_abbrev (abbrev_number, abbrevs);
|
|
if (! abbrev)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: Could not find abbrev number %d."),
|
|
abbrev_number);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
amt = sizeof (struct comp_unit);
|
|
unit = (struct comp_unit*) bfd_zalloc (abfd, amt);
|
|
unit->abfd = abfd;
|
|
unit->addr_size = addr_size;
|
|
unit->abbrevs = abbrevs;
|
|
unit->end_ptr = end_ptr;
|
|
|
|
for (i = 0; i < abbrev->num_attrs; ++i)
|
|
{
|
|
info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit, info_ptr);
|
|
|
|
/* Store the data if it is of an attribute we want to keep in a
|
|
partial symbol table. */
|
|
switch (attr.name)
|
|
{
|
|
case DW_AT_stmt_list:
|
|
unit->stmtlist = 1;
|
|
unit->line_offset = DW_UNSND (&attr);
|
|
break;
|
|
|
|
case DW_AT_name:
|
|
unit->name = DW_STRING (&attr);
|
|
break;
|
|
|
|
case DW_AT_low_pc:
|
|
unit->arange.low = DW_ADDR (&attr);
|
|
break;
|
|
|
|
case DW_AT_high_pc:
|
|
unit->arange.high = DW_ADDR (&attr);
|
|
break;
|
|
|
|
case DW_AT_comp_dir:
|
|
{
|
|
char* comp_dir = DW_STRING (&attr);
|
|
if (comp_dir)
|
|
{
|
|
/* Irix 6.2 native cc prepends <machine>.: to the compilation
|
|
directory, get rid of it. */
|
|
char *cp = (char*) strchr (comp_dir, ':');
|
|
|
|
if (cp && cp != comp_dir && cp[-1] == '.' && cp[1] == '/')
|
|
comp_dir = cp + 1;
|
|
}
|
|
unit->comp_dir = comp_dir;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
unit->first_child_die_ptr = info_ptr;
|
|
return unit;
|
|
}
|
|
|
|
/* Return true if UNIT contains the address given by ADDR. */
|
|
|
|
static boolean
|
|
comp_unit_contains_address (unit, addr)
|
|
struct comp_unit* unit;
|
|
bfd_vma addr;
|
|
{
|
|
struct arange *arange;
|
|
|
|
if (unit->error)
|
|
return 0;
|
|
|
|
arange = &unit->arange;
|
|
do
|
|
{
|
|
if (addr >= arange->low && addr < arange->high)
|
|
return 1;
|
|
arange = arange->next;
|
|
}
|
|
while (arange);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* If UNIT contains ADDR, set the output parameters to the values for
|
|
the line containing ADDR. The output parameters, FILENAME_PTR,
|
|
FUNCTIONNAME_PTR, and LINENUMBER_PTR, are pointers to the objects
|
|
to be filled in.
|
|
|
|
Return true of UNIT contains ADDR, and no errors were encountered;
|
|
false otherwise. */
|
|
|
|
static boolean
|
|
comp_unit_find_nearest_line (unit, addr,
|
|
filename_ptr, functionname_ptr, linenumber_ptr,
|
|
stash)
|
|
struct comp_unit* unit;
|
|
bfd_vma addr;
|
|
const char **filename_ptr;
|
|
const char **functionname_ptr;
|
|
unsigned int *linenumber_ptr;
|
|
struct dwarf2_debug *stash;
|
|
{
|
|
boolean line_p;
|
|
boolean func_p;
|
|
|
|
if (unit->error)
|
|
return false;
|
|
|
|
if (! unit->line_table)
|
|
{
|
|
if (! unit->stmtlist)
|
|
{
|
|
unit->error = 1;
|
|
return false;
|
|
}
|
|
|
|
unit->line_table = decode_line_info (unit, stash);
|
|
|
|
if (! unit->line_table)
|
|
{
|
|
unit->error = 1;
|
|
return false;
|
|
}
|
|
|
|
if (! scan_unit_for_functions (unit))
|
|
{
|
|
unit->error = 1;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
line_p = lookup_address_in_line_info_table (unit->line_table,
|
|
addr,
|
|
filename_ptr,
|
|
linenumber_ptr);
|
|
func_p = lookup_address_in_function_table (unit->function_table,
|
|
addr,
|
|
functionname_ptr);
|
|
return line_p || func_p;
|
|
}
|
|
|
|
/* Locate a section in a BFD containing debugging info. The search starts from the
|
|
section after AFTER_SEC, or from the first section in the BFD if AFTER_SEC is
|
|
NULL. The search works by examining the names of the sections. There are two
|
|
permissiable names. The first is .debug_info. This is the standard DWARF2 name.
|
|
The second is a prefix .gnu.linkonce.wi. This is a variation on the .debug_info
|
|
section which has a checksum describing the contents appended onto the name. This
|
|
allows the linker to identify and discard duplicate debugging sections for
|
|
different compilation units. */
|
|
#define DWARF2_DEBUG_INFO ".debug_info"
|
|
#define GNU_LINKONCE_INFO ".gnu.linkonce.wi."
|
|
|
|
static asection *
|
|
find_debug_info (abfd, after_sec)
|
|
bfd * abfd;
|
|
asection * after_sec;
|
|
{
|
|
asection * msec;
|
|
|
|
if (after_sec)
|
|
msec = after_sec->next;
|
|
else
|
|
msec = abfd->sections;
|
|
|
|
while (msec)
|
|
{
|
|
if (strcmp (msec->name, DWARF2_DEBUG_INFO) == 0)
|
|
return msec;
|
|
|
|
if (strncmp (msec->name, GNU_LINKONCE_INFO, strlen (GNU_LINKONCE_INFO)) == 0)
|
|
return msec;
|
|
|
|
msec = msec->next;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* The DWARF2 version of find_nearest line. Return true if the line
|
|
is found without error. ADDR_SIZE is the number of bytes in the
|
|
initial .debug_info length field and in the abbreviation offset.
|
|
You may use zero to indicate that the default value should be
|
|
used. */
|
|
|
|
boolean
|
|
_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
|
|
filename_ptr, functionname_ptr,
|
|
linenumber_ptr,
|
|
addr_size, pinfo)
|
|
bfd *abfd;
|
|
asection *section;
|
|
asymbol **symbols;
|
|
bfd_vma offset;
|
|
const char **filename_ptr;
|
|
const char **functionname_ptr;
|
|
unsigned int *linenumber_ptr;
|
|
unsigned int addr_size;
|
|
PTR *pinfo;
|
|
{
|
|
/* Read each compilation unit from the section .debug_info, and check
|
|
to see if it contains the address we are searching for. If yes,
|
|
lookup the address, and return the line number info. If no, go
|
|
on to the next compilation unit.
|
|
|
|
We keep a list of all the previously read compilation units, and
|
|
a pointer to the next un-read compilation unit. Check the
|
|
previously read units before reading more. */
|
|
struct dwarf2_debug *stash = (struct dwarf2_debug *) *pinfo;
|
|
|
|
/* What address are we looking for? */
|
|
bfd_vma addr = offset + section->vma;
|
|
|
|
struct comp_unit* each;
|
|
|
|
*filename_ptr = NULL;
|
|
*functionname_ptr = NULL;
|
|
*linenumber_ptr = 0;
|
|
|
|
/* The DWARF2 spec says that the initial length field, and the
|
|
offset of the abbreviation table, should both be 4-byte values.
|
|
However, some compilers do things differently. */
|
|
if (addr_size == 0)
|
|
addr_size = 4;
|
|
BFD_ASSERT (addr_size == 4 || addr_size == 8);
|
|
|
|
if (! stash)
|
|
{
|
|
bfd_size_type total_size;
|
|
asection *msec;
|
|
bfd_size_type amt = sizeof (struct dwarf2_debug);
|
|
|
|
stash = (struct dwarf2_debug*) bfd_zalloc (abfd, amt);
|
|
if (! stash)
|
|
return false;
|
|
|
|
*pinfo = (PTR) stash;
|
|
|
|
msec = find_debug_info (abfd, NULL);
|
|
if (! msec)
|
|
/* No dwarf2 info. Note that at this point the stash
|
|
has been allocated, but contains zeros, this lets
|
|
future calls to this function fail quicker. */
|
|
return false;
|
|
|
|
/* There can be more than one DWARF2 info section in a BFD these days.
|
|
Read them all in and produce one large stash. We do this in two
|
|
passes - in the first pass we just accumulate the section sizes.
|
|
In the second pass we read in the section's contents. The allows
|
|
us to avoid reallocing the data as we add sections to the stash. */
|
|
for (total_size = 0; msec; msec = find_debug_info (abfd, msec))
|
|
total_size += msec->_raw_size;
|
|
|
|
stash->info_ptr = (char *) bfd_alloc (abfd, total_size);
|
|
if (stash->info_ptr == NULL)
|
|
return false;
|
|
|
|
stash->info_ptr_end = stash->info_ptr;
|
|
|
|
for (msec = find_debug_info (abfd, NULL);
|
|
msec;
|
|
msec = find_debug_info (abfd, msec))
|
|
{
|
|
bfd_size_type size;
|
|
bfd_size_type start;
|
|
|
|
size = msec->_raw_size;
|
|
if (size == 0)
|
|
continue;
|
|
|
|
start = stash->info_ptr_end - stash->info_ptr;
|
|
|
|
if (! bfd_get_section_contents (abfd, msec, stash->info_ptr + start,
|
|
(bfd_vma) 0, size))
|
|
continue;
|
|
|
|
stash->info_ptr_end = stash->info_ptr + start + size;
|
|
}
|
|
|
|
BFD_ASSERT (stash->info_ptr_end == stash->info_ptr + total_size);
|
|
|
|
stash->sec = find_debug_info (abfd, NULL);
|
|
stash->sec_info_ptr = stash->info_ptr;
|
|
stash->syms = symbols;
|
|
}
|
|
|
|
/* FIXME: There is a problem with the contents of the
|
|
.debug_info section. The 'low' and 'high' addresses of the
|
|
comp_units are computed by relocs against symbols in the
|
|
.text segment. We need these addresses in order to determine
|
|
the nearest line number, and so we have to resolve the
|
|
relocs. There is a similar problem when the .debug_line
|
|
section is processed as well (e.g., there may be relocs
|
|
against the operand of the DW_LNE_set_address operator).
|
|
|
|
Unfortunately getting hold of the reloc information is hard...
|
|
|
|
For now, this means that disassembling object files (as
|
|
opposed to fully executables) does not always work as well as
|
|
we would like. */
|
|
|
|
/* A null info_ptr indicates that there is no dwarf2 info
|
|
(or that an error occured while setting up the stash). */
|
|
if (! stash->info_ptr)
|
|
return false;
|
|
|
|
/* Check the previously read comp. units first. */
|
|
for (each = stash->all_comp_units; each; each = each->next_unit)
|
|
if (comp_unit_contains_address (each, addr))
|
|
return comp_unit_find_nearest_line (each, addr, filename_ptr,
|
|
functionname_ptr, linenumber_ptr,
|
|
stash);
|
|
|
|
/* Read each remaining comp. units checking each as they are read. */
|
|
while (stash->info_ptr < stash->info_ptr_end)
|
|
{
|
|
bfd_vma length;
|
|
boolean found;
|
|
|
|
if (addr_size == 4)
|
|
length = read_4_bytes (abfd, stash->info_ptr);
|
|
else
|
|
length = read_8_bytes (abfd, stash->info_ptr);
|
|
stash->info_ptr += addr_size;
|
|
|
|
if (length > 0)
|
|
{
|
|
each = parse_comp_unit (abfd, stash, length, addr_size);
|
|
stash->info_ptr += length;
|
|
|
|
if ((bfd_vma) (stash->info_ptr - stash->sec_info_ptr)
|
|
== stash->sec->_raw_size)
|
|
{
|
|
stash->sec = find_debug_info (abfd, stash->sec);
|
|
stash->sec_info_ptr = stash->info_ptr;
|
|
}
|
|
|
|
if (each)
|
|
{
|
|
each->next_unit = stash->all_comp_units;
|
|
stash->all_comp_units = each;
|
|
|
|
/* DW_AT_low_pc and DW_AT_high_pc are optional for
|
|
compilation units. If we don't have them (i.e.,
|
|
unit->high == 0), we need to consult the line info
|
|
table to see if a compilation unit contains the given
|
|
address. */
|
|
if (each->arange.high > 0)
|
|
{
|
|
if (comp_unit_contains_address (each, addr))
|
|
return comp_unit_find_nearest_line (each, addr,
|
|
filename_ptr,
|
|
functionname_ptr,
|
|
linenumber_ptr,
|
|
stash);
|
|
}
|
|
else
|
|
{
|
|
found = comp_unit_find_nearest_line (each, addr,
|
|
filename_ptr,
|
|
functionname_ptr,
|
|
linenumber_ptr,
|
|
stash);
|
|
if (found)
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|