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objdump.c
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3864 lines (3306 loc) · 99.6 KB
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/* objdump.c -- dump information about an object file.
Copyright (C) 1990-2016 Free Software Foundation, Inc.
This file is part of GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
/* Objdump overview.
Objdump displays information about one or more object files, either on
their own, or inside libraries. It is commonly used as a disassembler,
but it can also display information about file headers, symbol tables,
relocations, debugging directives and more.
The flow of execution is as follows:
1. Command line arguments are checked for control switches and the
information to be displayed is selected.
2. Any remaining arguments are assumed to be object files, and they are
processed in order by display_bfd(). If the file is an archive each
of its elements is processed in turn.
3. The file's target architecture and binary file format are determined
by bfd_check_format(). If they are recognised, then dump_bfd() is
called.
4. dump_bfd() in turn calls separate functions to display the requested
item(s) of information(s). For example disassemble_data() is called if
a disassembly has been requested.
When disassembling the code loops through blocks of instructions bounded
by symbols, calling disassemble_bytes() on each block. The actual
disassembling is done by the libopcodes library, via a function pointer
supplied by the disassembler() function. */
#include "sysdep.h"
#include "bfd.h"
#include "elf-bfd.h"
#include "coff-bfd.h"
#include "progress.h"
#include "bucomm.h"
#include "elfcomm.h"
#include "dwarf.h"
#include "getopt.h"
#include "safe-ctype.h"
#include "dis-asm.h"
#include "libiberty.h"
#include "demangle.h"
#include "filenames.h"
#include "debug.h"
#include "budbg.h"
#include "objdump.h"
#ifdef HAVE_MMAP
#include <sys/mman.h>
#endif
/* Internal headers for the ELF .stab-dump code - sorry. */
#define BYTES_IN_WORD 32
#include "aout/aout64.h"
/* Exit status. */
static int exit_status = 0;
static char *default_target = NULL; /* Default at runtime. */
/* The following variables are set based on arguments passed on the
command line. */
static int show_version = 0; /* Show the version number. */
static int dump_section_contents; /* -s */
static int dump_section_headers; /* -h */
static bfd_boolean dump_file_header; /* -f */
static int dump_symtab; /* -t */
static int dump_dynamic_symtab; /* -T */
static int dump_reloc_info; /* -r */
static int dump_dynamic_reloc_info; /* -R */
static int dump_ar_hdrs; /* -a */
static int dump_private_headers; /* -p */
static char *dump_private_options; /* -P */
static int prefix_addresses; /* --prefix-addresses */
static int with_line_numbers; /* -l */
static bfd_boolean with_source_code; /* -S */
static int show_raw_insn; /* --show-raw-insn */
static int dump_dwarf_section_info; /* --dwarf */
static int dump_stab_section_info; /* --stabs */
static int do_demangle; /* -C, --demangle */
static bfd_boolean disassemble; /* -d */
static bfd_boolean disassemble_all; /* -D */
static int disassemble_zeroes; /* --disassemble-zeroes */
static bfd_boolean formats_info; /* -i */
static int wide_output; /* -w */
static int insn_width; /* --insn-width */
static bfd_vma start_address = (bfd_vma) -1; /* --start-address */
static bfd_vma stop_address = (bfd_vma) -1; /* --stop-address */
static int dump_debugging; /* --debugging */
static int dump_debugging_tags; /* --debugging-tags */
static int suppress_bfd_header;
static int dump_special_syms = 0; /* --special-syms */
static bfd_vma adjust_section_vma = 0; /* --adjust-vma */
static int file_start_context = 0; /* --file-start-context */
static bfd_boolean display_file_offsets;/* -F */
static const char *prefix; /* --prefix */
static int prefix_strip; /* --prefix-strip */
static size_t prefix_length;
/* A structure to record the sections mentioned in -j switches. */
struct only
{
const char * name; /* The name of the section. */
bfd_boolean seen; /* A flag to indicate that the section has been found in one or more input files. */
struct only * next; /* Pointer to the next structure in the list. */
};
/* Pointer to an array of 'only' structures.
This pointer is NULL if the -j switch has not been used. */
static struct only * only_list = NULL;
/* Variables for handling include file path table. */
static const char **include_paths;
static int include_path_count;
/* Extra info to pass to the section disassembler and address printing
function. */
struct objdump_disasm_info
{
bfd * abfd;
asection * sec;
bfd_boolean require_sec;
arelent ** dynrelbuf;
long dynrelcount;
disassembler_ftype disassemble_fn;
arelent * reloc;
};
/* Architecture to disassemble for, or default if NULL. */
static char *machine = NULL;
/* Target specific options to the disassembler. */
static char *disassembler_options = NULL;
/* Endianness to disassemble for, or default if BFD_ENDIAN_UNKNOWN. */
static enum bfd_endian endian = BFD_ENDIAN_UNKNOWN;
/* The symbol table. */
static asymbol **syms;
/* Number of symbols in `syms'. */
static long symcount = 0;
/* The sorted symbol table. */
static asymbol **sorted_syms;
/* Number of symbols in `sorted_syms'. */
static long sorted_symcount = 0;
/* The dynamic symbol table. */
static asymbol **dynsyms;
/* The synthetic symbol table. */
static asymbol *synthsyms;
static long synthcount = 0;
/* Number of symbols in `dynsyms'. */
static long dynsymcount = 0;
static bfd_byte *stabs;
static bfd_size_type stab_size;
static char *strtab;
static bfd_size_type stabstr_size;
static bfd_boolean is_relocatable = FALSE;
/* Handlers for -P/--private. */
static const struct objdump_private_desc * const objdump_private_vectors[] =
{
OBJDUMP_PRIVATE_VECTORS
NULL
};
static void usage (FILE *, int) ATTRIBUTE_NORETURN;
static void
usage (FILE *stream, int status)
{
fprintf (stream, _("Usage: %s <option(s)> <file(s)>\n"), program_name);
fprintf (stream, _(" Display information from object <file(s)>.\n"));
fprintf (stream, _(" At least one of the following switches must be given:\n"));
fprintf (stream, _("\
-a, --archive-headers Display archive header information\n\
-f, --file-headers Display the contents of the overall file header\n\
-p, --private-headers Display object format specific file header contents\n\
-P, --private=OPT,OPT... Display object format specific contents\n\
-h, --[section-]headers Display the contents of the section headers\n\
-x, --all-headers Display the contents of all headers\n\
-d, --disassemble Display assembler contents of executable sections\n\
-D, --disassemble-all Display assembler contents of all sections\n\
-S, --source Intermix source code with disassembly\n\
-s, --full-contents Display the full contents of all sections requested\n\
-g, --debugging Display debug information in object file\n\
-e, --debugging-tags Display debug information using ctags style\n\
-G, --stabs Display (in raw form) any STABS info in the file\n\
-W[lLiaprmfFsoRt] or\n\
--dwarf[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,\n\
=frames-interp,=str,=loc,=Ranges,=pubtypes,\n\
=gdb_index,=trace_info,=trace_abbrev,=trace_aranges,\n\
=addr,=cu_index]\n\
Display DWARF info in the file\n\
-t, --syms Display the contents of the symbol table(s)\n\
-T, --dynamic-syms Display the contents of the dynamic symbol table\n\
-r, --reloc Display the relocation entries in the file\n\
-R, --dynamic-reloc Display the dynamic relocation entries in the file\n\
@<file> Read options from <file>\n\
-v, --version Display this program's version number\n\
-i, --info List object formats and architectures supported\n\
-H, --help Display this information\n\
"));
if (status != 2)
{
const struct objdump_private_desc * const *desc;
fprintf (stream, _("\n The following switches are optional:\n"));
fprintf (stream, _("\
-b, --target=BFDNAME Specify the target object format as BFDNAME\n\
-m, --architecture=MACHINE Specify the target architecture as MACHINE\n\
-j, --section=NAME Only display information for section NAME\n\
-M, --disassembler-options=OPT Pass text OPT on to the disassembler\n\
-EB --endian=big Assume big endian format when disassembling\n\
-EL --endian=little Assume little endian format when disassembling\n\
--file-start-context Include context from start of file (with -S)\n\
-I, --include=DIR Add DIR to search list for source files\n\
-l, --line-numbers Include line numbers and filenames in output\n\
-F, --file-offsets Include file offsets when displaying information\n\
-C, --demangle[=STYLE] Decode mangled/processed symbol names\n\
The STYLE, if specified, can be `auto', `gnu',\n\
`lucid', `arm', `hp', `edg', `gnu-v3', `java'\n\
or `gnat'\n\
-w, --wide Format output for more than 80 columns\n\
-z, --disassemble-zeroes Do not skip blocks of zeroes when disassembling\n\
--start-address=ADDR Only process data whose address is >= ADDR\n\
--stop-address=ADDR Only process data whose address is <= ADDR\n\
--prefix-addresses Print complete address alongside disassembly\n\
--[no-]show-raw-insn Display hex alongside symbolic disassembly\n\
--insn-width=WIDTH Display WIDTH bytes on a single line for -d\n\
--adjust-vma=OFFSET Add OFFSET to all displayed section addresses\n\
--special-syms Include special symbols in symbol dumps\n\
--prefix=PREFIX Add PREFIX to absolute paths for -S\n\
--prefix-strip=LEVEL Strip initial directory names for -S\n"));
fprintf (stream, _("\
--dwarf-depth=N Do not display DIEs at depth N or greater\n\
--dwarf-start=N Display DIEs starting with N, at the same depth\n\
or deeper\n\
--dwarf-check Make additional dwarf internal consistency checks.\
\n\n"));
list_supported_targets (program_name, stream);
list_supported_architectures (program_name, stream);
disassembler_usage (stream);
if (objdump_private_vectors[0] != NULL)
{
fprintf (stream,
_("\nOptions supported for -P/--private switch:\n"));
for (desc = objdump_private_vectors; *desc != NULL; desc++)
(*desc)->help (stream);
}
}
if (REPORT_BUGS_TO[0] && status == 0)
fprintf (stream, _("Report bugs to %s.\n"), REPORT_BUGS_TO);
exit (status);
}
/* 150 isn't special; it's just an arbitrary non-ASCII char value. */
enum option_values
{
OPTION_ENDIAN=150,
OPTION_START_ADDRESS,
OPTION_STOP_ADDRESS,
OPTION_DWARF,
OPTION_PREFIX,
OPTION_PREFIX_STRIP,
OPTION_INSN_WIDTH,
OPTION_ADJUST_VMA,
OPTION_DWARF_DEPTH,
OPTION_DWARF_CHECK,
OPTION_DWARF_START
};
static struct option long_options[]=
{
{"adjust-vma", required_argument, NULL, OPTION_ADJUST_VMA},
{"all-headers", no_argument, NULL, 'x'},
{"private-headers", no_argument, NULL, 'p'},
{"private", required_argument, NULL, 'P'},
{"architecture", required_argument, NULL, 'm'},
{"archive-headers", no_argument, NULL, 'a'},
{"debugging", no_argument, NULL, 'g'},
{"debugging-tags", no_argument, NULL, 'e'},
{"demangle", optional_argument, NULL, 'C'},
{"disassemble", no_argument, NULL, 'd'},
{"disassemble-all", no_argument, NULL, 'D'},
{"disassembler-options", required_argument, NULL, 'M'},
{"disassemble-zeroes", no_argument, NULL, 'z'},
{"dynamic-reloc", no_argument, NULL, 'R'},
{"dynamic-syms", no_argument, NULL, 'T'},
{"endian", required_argument, NULL, OPTION_ENDIAN},
{"file-headers", no_argument, NULL, 'f'},
{"file-offsets", no_argument, NULL, 'F'},
{"file-start-context", no_argument, &file_start_context, 1},
{"full-contents", no_argument, NULL, 's'},
{"headers", no_argument, NULL, 'h'},
{"help", no_argument, NULL, 'H'},
{"info", no_argument, NULL, 'i'},
{"line-numbers", no_argument, NULL, 'l'},
{"no-show-raw-insn", no_argument, &show_raw_insn, -1},
{"prefix-addresses", no_argument, &prefix_addresses, 1},
{"reloc", no_argument, NULL, 'r'},
{"section", required_argument, NULL, 'j'},
{"section-headers", no_argument, NULL, 'h'},
{"show-raw-insn", no_argument, &show_raw_insn, 1},
{"source", no_argument, NULL, 'S'},
{"special-syms", no_argument, &dump_special_syms, 1},
{"include", required_argument, NULL, 'I'},
{"dwarf", optional_argument, NULL, OPTION_DWARF},
{"stabs", no_argument, NULL, 'G'},
{"start-address", required_argument, NULL, OPTION_START_ADDRESS},
{"stop-address", required_argument, NULL, OPTION_STOP_ADDRESS},
{"syms", no_argument, NULL, 't'},
{"target", required_argument, NULL, 'b'},
{"version", no_argument, NULL, 'V'},
{"wide", no_argument, NULL, 'w'},
{"prefix", required_argument, NULL, OPTION_PREFIX},
{"prefix-strip", required_argument, NULL, OPTION_PREFIX_STRIP},
{"insn-width", required_argument, NULL, OPTION_INSN_WIDTH},
{"dwarf-depth", required_argument, 0, OPTION_DWARF_DEPTH},
{"dwarf-start", required_argument, 0, OPTION_DWARF_START},
{"dwarf-check", no_argument, 0, OPTION_DWARF_CHECK},
{0, no_argument, 0, 0}
};
static void
nonfatal (const char *msg)
{
bfd_nonfatal (msg);
exit_status = 1;
}
/* Returns TRUE if the specified section should be dumped. */
static bfd_boolean
process_section_p (asection * section)
{
struct only * only;
if (only_list == NULL)
return TRUE;
for (only = only_list; only; only = only->next)
if (strcmp (only->name, section->name) == 0)
{
only->seen = TRUE;
return TRUE;
}
return FALSE;
}
/* Add an entry to the 'only' list. */
static void
add_only (char * name)
{
struct only * only;
/* First check to make sure that we do not
already have an entry for this name. */
for (only = only_list; only; only = only->next)
if (strcmp (only->name, name) == 0)
return;
only = xmalloc (sizeof * only);
only->name = name;
only->seen = FALSE;
only->next = only_list;
only_list = only;
}
/* Release the memory used by the 'only' list.
PR 11225: Issue a warning message for unseen sections.
Only do this if none of the sections were seen. This is mainly to support
tools like the GAS testsuite where an object file is dumped with a list of
generic section names known to be present in a range of different file
formats. */
static void
free_only_list (void)
{
bfd_boolean at_least_one_seen = FALSE;
struct only * only;
struct only * next;
if (only_list == NULL)
return;
for (only = only_list; only; only = only->next)
if (only->seen)
{
at_least_one_seen = TRUE;
break;
}
for (only = only_list; only; only = next)
{
if (! at_least_one_seen)
{
non_fatal (_("section '%s' mentioned in a -j option, "
"but not found in any input file"),
only->name);
exit_status = 1;
}
next = only->next;
free (only);
}
}
static void
dump_section_header (bfd *abfd, asection *section,
void *ignored ATTRIBUTE_UNUSED)
{
char *comma = "";
unsigned int opb = bfd_octets_per_byte (abfd);
/* Ignore linker created section. See elfNN_ia64_object_p in
bfd/elfxx-ia64.c. */
if (section->flags & SEC_LINKER_CREATED)
return;
/* PR 10413: Skip sections that we are ignoring. */
if (! process_section_p (section))
return;
printf ("%3d %-13s %08lx ", section->index,
bfd_get_section_name (abfd, section),
(unsigned long) bfd_section_size (abfd, section) / opb);
bfd_printf_vma (abfd, bfd_get_section_vma (abfd, section));
printf (" ");
bfd_printf_vma (abfd, section->lma);
printf (" %08lx 2**%u", (unsigned long) section->filepos,
bfd_get_section_alignment (abfd, section));
if (! wide_output)
printf ("\n ");
printf (" ");
#define PF(x, y) \
if (section->flags & x) { printf ("%s%s", comma, y); comma = ", "; }
PF (SEC_HAS_CONTENTS, "CONTENTS");
PF (SEC_ALLOC, "ALLOC");
PF (SEC_CONSTRUCTOR, "CONSTRUCTOR");
PF (SEC_LOAD, "LOAD");
PF (SEC_RELOC, "RELOC");
PF (SEC_READONLY, "READONLY");
PF (SEC_CODE, "CODE");
PF (SEC_DATA, "DATA");
PF (SEC_ROM, "ROM");
PF (SEC_DEBUGGING, "DEBUGGING");
PF (SEC_NEVER_LOAD, "NEVER_LOAD");
PF (SEC_EXCLUDE, "EXCLUDE");
PF (SEC_SORT_ENTRIES, "SORT_ENTRIES");
if (bfd_get_arch (abfd) == bfd_arch_tic54x)
{
PF (SEC_TIC54X_BLOCK, "BLOCK");
PF (SEC_TIC54X_CLINK, "CLINK");
}
PF (SEC_SMALL_DATA, "SMALL_DATA");
if (bfd_get_flavour (abfd) == bfd_target_coff_flavour)
{
PF (SEC_COFF_SHARED, "SHARED");
PF (SEC_COFF_NOREAD, "NOREAD");
}
else if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
PF (SEC_ELF_PURECODE, "PURECODE");
PF (SEC_THREAD_LOCAL, "THREAD_LOCAL");
PF (SEC_GROUP, "GROUP");
if (bfd_get_arch (abfd) == bfd_arch_mep)
{
PF (SEC_MEP_VLIW, "VLIW");
}
if ((section->flags & SEC_LINK_ONCE) != 0)
{
const char *ls;
struct coff_comdat_info *comdat;
switch (section->flags & SEC_LINK_DUPLICATES)
{
default:
abort ();
case SEC_LINK_DUPLICATES_DISCARD:
ls = "LINK_ONCE_DISCARD";
break;
case SEC_LINK_DUPLICATES_ONE_ONLY:
ls = "LINK_ONCE_ONE_ONLY";
break;
case SEC_LINK_DUPLICATES_SAME_SIZE:
ls = "LINK_ONCE_SAME_SIZE";
break;
case SEC_LINK_DUPLICATES_SAME_CONTENTS:
ls = "LINK_ONCE_SAME_CONTENTS";
break;
}
printf ("%s%s", comma, ls);
comdat = bfd_coff_get_comdat_section (abfd, section);
if (comdat != NULL)
printf (" (COMDAT %s %ld)", comdat->name, comdat->symbol);
comma = ", ";
}
printf ("\n");
#undef PF
}
static void
dump_headers (bfd *abfd)
{
printf (_("Sections:\n"));
#ifndef BFD64
printf (_("Idx Name Size VMA LMA File off Algn"));
#else
/* With BFD64, non-ELF returns -1 and wants always 64 bit addresses. */
if (bfd_get_arch_size (abfd) == 32)
printf (_("Idx Name Size VMA LMA File off Algn"));
else
printf (_("Idx Name Size VMA LMA File off Algn"));
#endif
if (wide_output)
printf (_(" Flags"));
printf ("\n");
bfd_map_over_sections (abfd, dump_section_header, NULL);
}
static asymbol **
slurp_symtab (bfd *abfd)
{
asymbol **sy = NULL;
long storage;
if (!(bfd_get_file_flags (abfd) & HAS_SYMS))
{
symcount = 0;
return NULL;
}
storage = bfd_get_symtab_upper_bound (abfd);
if (storage < 0)
{
non_fatal (_("failed to read symbol table from: %s"), bfd_get_filename (abfd));
bfd_fatal (_("error message was"));
}
if (storage)
sy = (asymbol **) xmalloc (storage);
symcount = bfd_canonicalize_symtab (abfd, sy);
if (symcount < 0)
bfd_fatal (bfd_get_filename (abfd));
return sy;
}
/* Read in the dynamic symbols. */
static asymbol **
slurp_dynamic_symtab (bfd *abfd)
{
asymbol **sy = NULL;
long storage;
storage = bfd_get_dynamic_symtab_upper_bound (abfd);
if (storage < 0)
{
if (!(bfd_get_file_flags (abfd) & DYNAMIC))
{
non_fatal (_("%s: not a dynamic object"), bfd_get_filename (abfd));
exit_status = 1;
dynsymcount = 0;
return NULL;
}
bfd_fatal (bfd_get_filename (abfd));
}
if (storage)
sy = (asymbol **) xmalloc (storage);
dynsymcount = bfd_canonicalize_dynamic_symtab (abfd, sy);
if (dynsymcount < 0)
bfd_fatal (bfd_get_filename (abfd));
return sy;
}
/* Filter out (in place) symbols that are useless for disassembly.
COUNT is the number of elements in SYMBOLS.
Return the number of useful symbols. */
static long
remove_useless_symbols (asymbol **symbols, long count)
{
asymbol **in_ptr = symbols, **out_ptr = symbols;
while (--count >= 0)
{
asymbol *sym = *in_ptr++;
if (sym->name == NULL || sym->name[0] == '\0')
continue;
if (sym->flags & (BSF_DEBUGGING | BSF_SECTION_SYM))
continue;
if (bfd_is_und_section (sym->section)
|| bfd_is_com_section (sym->section))
continue;
*out_ptr++ = sym;
}
return out_ptr - symbols;
}
/* Sort symbols into value order. */
static int
compare_symbols (const void *ap, const void *bp)
{
const asymbol *a = * (const asymbol **) ap;
const asymbol *b = * (const asymbol **) bp;
const char *an;
const char *bn;
size_t anl;
size_t bnl;
bfd_boolean af;
bfd_boolean bf;
flagword aflags;
flagword bflags;
if (bfd_asymbol_value (a) > bfd_asymbol_value (b))
return 1;
else if (bfd_asymbol_value (a) < bfd_asymbol_value (b))
return -1;
if (a->section > b->section)
return 1;
else if (a->section < b->section)
return -1;
an = bfd_asymbol_name (a);
bn = bfd_asymbol_name (b);
anl = strlen (an);
bnl = strlen (bn);
/* The symbols gnu_compiled and gcc2_compiled convey no real
information, so put them after other symbols with the same value. */
af = (strstr (an, "gnu_compiled") != NULL
|| strstr (an, "gcc2_compiled") != NULL);
bf = (strstr (bn, "gnu_compiled") != NULL
|| strstr (bn, "gcc2_compiled") != NULL);
if (af && ! bf)
return 1;
if (! af && bf)
return -1;
/* We use a heuristic for the file name, to try to sort it after
more useful symbols. It may not work on non Unix systems, but it
doesn't really matter; the only difference is precisely which
symbol names get printed. */
#define file_symbol(s, sn, snl) \
(((s)->flags & BSF_FILE) != 0 \
|| ((sn)[(snl) - 2] == '.' \
&& ((sn)[(snl) - 1] == 'o' \
|| (sn)[(snl) - 1] == 'a')))
af = file_symbol (a, an, anl);
bf = file_symbol (b, bn, bnl);
if (af && ! bf)
return 1;
if (! af && bf)
return -1;
/* Try to sort global symbols before local symbols before function
symbols before debugging symbols. */
aflags = a->flags;
bflags = b->flags;
if ((aflags & BSF_DEBUGGING) != (bflags & BSF_DEBUGGING))
{
if ((aflags & BSF_DEBUGGING) != 0)
return 1;
else
return -1;
}
if ((aflags & BSF_FUNCTION) != (bflags & BSF_FUNCTION))
{
if ((aflags & BSF_FUNCTION) != 0)
return -1;
else
return 1;
}
if ((aflags & BSF_LOCAL) != (bflags & BSF_LOCAL))
{
if ((aflags & BSF_LOCAL) != 0)
return 1;
else
return -1;
}
if ((aflags & BSF_GLOBAL) != (bflags & BSF_GLOBAL))
{
if ((aflags & BSF_GLOBAL) != 0)
return -1;
else
return 1;
}
if (bfd_get_flavour (bfd_asymbol_bfd (a)) == bfd_target_elf_flavour
&& bfd_get_flavour (bfd_asymbol_bfd (b)) == bfd_target_elf_flavour)
{
bfd_vma asz, bsz;
asz = 0;
if ((a->flags & BSF_SYNTHETIC) == 0)
asz = ((elf_symbol_type *) a)->internal_elf_sym.st_size;
bsz = 0;
if ((b->flags & BSF_SYNTHETIC) == 0)
bsz = ((elf_symbol_type *) b)->internal_elf_sym.st_size;
if (asz != bsz)
return asz > bsz ? -1 : 1;
}
/* Symbols that start with '.' might be section names, so sort them
after symbols that don't start with '.'. */
if (an[0] == '.' && bn[0] != '.')
return 1;
if (an[0] != '.' && bn[0] == '.')
return -1;
/* Finally, if we can't distinguish them in any other way, try to
get consistent results by sorting the symbols by name. */
return strcmp (an, bn);
}
/* Sort relocs into address order. */
static int
compare_relocs (const void *ap, const void *bp)
{
const arelent *a = * (const arelent **) ap;
const arelent *b = * (const arelent **) bp;
if (a->address > b->address)
return 1;
else if (a->address < b->address)
return -1;
/* So that associated relocations tied to the same address show up
in the correct order, we don't do any further sorting. */
if (a > b)
return 1;
else if (a < b)
return -1;
else
return 0;
}
/* Print an address (VMA) to the output stream in INFO.
If SKIP_ZEROES is TRUE, omit leading zeroes. */
static void
objdump_print_value (bfd_vma vma, struct disassemble_info *inf,
bfd_boolean skip_zeroes)
{
char buf[30];
char *p;
struct objdump_disasm_info *aux;
aux = (struct objdump_disasm_info *) inf->application_data;
bfd_sprintf_vma (aux->abfd, buf, vma);
if (! skip_zeroes)
p = buf;
else
{
for (p = buf; *p == '0'; ++p)
;
if (*p == '\0')
--p;
}
(*inf->fprintf_func) (inf->stream, "%s", p);
}
/* Print the name of a symbol. */
static void
objdump_print_symname (bfd *abfd, struct disassemble_info *inf,
asymbol *sym)
{
char *alloc;
const char *name, *version_string = NULL;
bfd_boolean hidden = FALSE;
alloc = NULL;
name = bfd_asymbol_name (sym);
if (do_demangle && name[0] != '\0')
{
/* Demangle the name. */
alloc = bfd_demangle (abfd, name, DMGL_ANSI | DMGL_PARAMS);
if (alloc != NULL)
name = alloc;
}
if ((sym->flags & BSF_SYNTHETIC) == 0)
version_string = bfd_get_symbol_version_string (abfd, sym, &hidden);
if (bfd_is_und_section (bfd_get_section (sym)))
hidden = TRUE;
if (inf != NULL)
{
(*inf->fprintf_func) (inf->stream, "%s", name);
if (version_string && *version_string != '\0')
(*inf->fprintf_func) (inf->stream, hidden ? "@%s" : "@@%s",
version_string);
}
else
{
printf ("%s", name);
if (version_string && *version_string != '\0')
printf (hidden ? "@%s" : "@@%s", version_string);
}
if (alloc != NULL)
free (alloc);
}
/* Locate a symbol given a bfd and a section (from INFO->application_data),
and a VMA. If INFO->application_data->require_sec is TRUE, then always
require the symbol to be in the section. Returns NULL if there is no
suitable symbol. If PLACE is not NULL, then *PLACE is set to the index
of the symbol in sorted_syms. */
static asymbol *
find_symbol_for_address (bfd_vma vma,
struct disassemble_info *inf,
long *place)
{
/* @@ Would it speed things up to cache the last two symbols returned,
and maybe their address ranges? For many processors, only one memory
operand can be present at a time, so the 2-entry cache wouldn't be
constantly churned by code doing heavy memory accesses. */
/* Indices in `sorted_syms'. */
long min = 0;
long max_count = sorted_symcount;
long thisplace;
struct objdump_disasm_info *aux;
bfd *abfd;
asection *sec;
unsigned int opb;
bfd_boolean want_section;
if (sorted_symcount < 1)
return NULL;
aux = (struct objdump_disasm_info *) inf->application_data;
abfd = aux->abfd;
sec = aux->sec;
opb = inf->octets_per_byte;
/* Perform a binary search looking for the closest symbol to the
required value. We are searching the range (min, max_count]. */
while (min + 1 < max_count)
{
asymbol *sym;
thisplace = (max_count + min) / 2;
sym = sorted_syms[thisplace];
if (bfd_asymbol_value (sym) > vma)
max_count = thisplace;
else if (bfd_asymbol_value (sym) < vma)
min = thisplace;
else
{
min = thisplace;
break;
}
}
/* The symbol we want is now in min, the low end of the range we
were searching. If there are several symbols with the same
value, we want the first one. */
thisplace = min;
while (thisplace > 0
&& (bfd_asymbol_value (sorted_syms[thisplace])
== bfd_asymbol_value (sorted_syms[thisplace - 1])))
--thisplace;
/* Prefer a symbol in the current section if we have multple symbols
with the same value, as can occur with overlays or zero size
sections. */
min = thisplace;
while (min < max_count
&& (bfd_asymbol_value (sorted_syms[min])
== bfd_asymbol_value (sorted_syms[thisplace])))
{
if (sorted_syms[min]->section == sec
&& inf->symbol_is_valid (sorted_syms[min], inf))
{
thisplace = min;
if (place != NULL)
*place = thisplace;
return sorted_syms[thisplace];
}
++min;
}
/* If the file is relocatable, and the symbol could be from this
section, prefer a symbol from this section over symbols from
others, even if the other symbol's value might be closer.
Note that this may be wrong for some symbol references if the
sections have overlapping memory ranges, but in that case there's
no way to tell what's desired without looking at the relocation
table.
Also give the target a chance to reject symbols. */
want_section = (aux->require_sec
|| ((abfd->flags & HAS_RELOC) != 0
&& vma >= bfd_get_section_vma (abfd, sec)
&& vma < (bfd_get_section_vma (abfd, sec)
+ bfd_section_size (abfd, sec) / opb)));
if ((sorted_syms[thisplace]->section != sec && want_section)
|| ! inf->symbol_is_valid (sorted_syms[thisplace], inf))
{
long i;
long newplace = sorted_symcount;
for (i = min - 1; i >= 0; i--)
{
if ((sorted_syms[i]->section == sec || !want_section)
&& inf->symbol_is_valid (sorted_syms[i], inf))
{
if (newplace == sorted_symcount)
newplace = i;
if (bfd_asymbol_value (sorted_syms[i])
!= bfd_asymbol_value (sorted_syms[newplace]))
break;
/* Remember this symbol and keep searching until we reach
an earlier address. */
newplace = i;
}
}
if (newplace != sorted_symcount)
thisplace = newplace;
else
{
/* We didn't find a good symbol with a smaller value.
Look for one with a larger value. */
for (i = thisplace + 1; i < sorted_symcount; i++)
{
if ((sorted_syms[i]->section == sec || !want_section)
&& inf->symbol_is_valid (sorted_syms[i], inf))
{
thisplace = i;
break;
}
}
}
if ((sorted_syms[thisplace]->section != sec && want_section)