objdump - display information from object files.
SYNOPSIS
objdump [ -a | --archive-headers ]
[ -b bfdname | --target=bfdname ]
[ -C | --demangle[=style] ]
[ -d | --disassemble ]
[ -D | --disassemble-all ]
[ -z | --disassemble-zeroes ]
[ -EB | -EL | --endian={big | little } ]
[ -f | --file-headers ]
[ --file-start-context ]
[ -g | --debugging ]
[ -h | --section-headers | --headers ]
[ -i | --info ]
[ -j section | --section=section ]
[ -l | --line-numbers ]
[ -S | --source ]
[ -m machine | --architecture=machine ]
[ -M options | --disassembler-options=options]
[ -p | --private-headers ]
[ -r | --reloc ]
[ -R | --dynamic-reloc ]
[ -s | --full-contents ]
[ -G | --stabs ]
[ -t | --syms ]
[ -T | --dynamic-syms ]
[ -x | --all-headers ]
[ -w | --wide ]
[ --start-address=address ]
[ --stop-address=address ]
[ --prefix-addresses]
[ --[no-]show-raw-insn ]
[ --adjust-vma=offset ]
[ -V | --version ]
[ -H | --help ]
objfile...
DESCRIPTION
`objdump' displays information about one or more object
files. The options control what particular information to
display. This information is mostly useful to programmers
who are working on the compilation tools, as opposed to
programmers who just want their program to compile and
work.
objfile... are the object files to be examined. When you
specify archives, `objdump' shows information on each of
the member object files.
OPTIONS
The long and short forms of options, shown here as alter
natives, are equivalent. At least one option from the
be given.
`-a'
`--archive-header'
If any of the objfile files are archives, display the
archive header information (in a format similar to ls
-l). Besides the information you could list with ar
tv, objdump -a shows the object file format of each
archive member.
`--adjust-vma=offset'
When dumping information, first add offset to all the
section addresses. This is useful if the section
addresses do not correspond to the symbol table, which
can happen when putting sections at particular
addresses when using a format which can not represent
section addresses, such as a.out.
`-b bfdname'
`--target=bfdname'
Specify that the object-code format for the object
files is bfdname. This option may not be necessary;
objdump can automatically recognize many formats.
For example,
objdump -b oasys -m vax -h fu.o
displays summary information from the section headers
(-h) of fu.o, which is explicitly identified (-m) as a
VAX object file in the format produced by Oasys com
pilers. You can list the formats available with the
-i option.
`-C'
`--demangle[=style]'
Decode (demangle) low-level symbol names into user-
level names. Besides removing any initial underscore
prepended by the system, this makes C++ function names
readable. Different compilers have different mangling
styles. The optional demangling style argument can be
used to choose an appropriate demangling style for
your compiler.
`-G'
`--debugging'
Display debugging information. This attempts to parse
debugging information stored in the file and print it
out using a C like syntax. Only certain types of
`-d'
`--disassemble'
Display the assembler mnemonics for the machine
instructions from objfile. This option only disassem
bles those sections which are expected to contain
instructions.
`-D'
`--disassemble-all'
Like -d, but disassemble the contents of all sections,
not just those expected to contain instructions.
`--prefix-addresses'
When disassembling, print the complete address on each
line. This is the older disassembly format.
`--disassemble-zeroes'
Normally the disassembly output will skip blocks of
zeroes. This option directs the disassembler to dis
assemble those blocks, just like any other data.
`-EB'
`-EL'
`--endian={big|little}'
Specify the endianness of the object files. This only
affects disassembly. This can be useful when disas
sembling a file format which does not describe endian
ness information, such as S-records.
`-f'
`--file-header'
Display summary information from the overall header of
each of the objfile files.
`--file-start-context'
Specify that when displaying interlisted source
code/disassembly (assumes '-S') from a file that has
not yet been displayed, extend the context to the
start of the file.
`-h'
`--section-header'
`--header'
Display summary information from the section headers
of the object file.
addresses, for example by using the -Ttext, -Tdata, or
-Tbss options to `ld'. However, some object file for
mats, such as a.out, do not store the starting address
of the file segments. In those situations, although
`ld' relocates the sections correctly, using objdump
-h to list the file section headers cannot show the
correct addresses. Instead, it shows the usual
addresses, which are implicit for the target.
`--help'
Print a summary of the options to `objdump' and exit.
`-i'
`--info'
Display a list showing all architectures and object
formats available for specification with -b or -m.
`-j name'
`--section=name'
Display information only for section name.
`-l'
`--line-numbers'
Label the display (using debugging information) with
the filename and source line numbers corresponding to
the object code or relocs shown. Only useful with -d,
-D, or -r.
`-m machine'
`--architecture=machine'
Specify the architecture to use when disassembling
object files. This can be useful when disassembling
object files which do not describe architecture infor
mation, such as S-records. You can list the available
architectures with the -i option.
`-M options'
`--disassembler-options=options'
Pass target specific information to the disassembler.
Only supported on some targets.
If the target is an ARM architecture then this switch
can be used to select which register name set is used
during disassembler. Specifying -M reg-name-std (the
default) will select the register names as used in
ARM's instruction set documentation, but with register
13 called 'sp', register 14 called 'lr' and register
15 called 'pc'. Specifying -M reg-names-apcs will
Standard, whilst specifying -M reg-names-raw will just
use r followed by the register number.
There are also two variants on the APCS register nam
ing scheme enabled by -M reg-names-atpcs and -M reg-
names-special-atpcs which use the ARM/Thumb Procedure
Call Standard naming conventions. (Eiuther with the
normal register name sor the special register names).
This option can also be used for ARM architectures to
force the disassembler to interpret all instructions
as THUMB instructions by using the switch --disassem
bler-options=force-thumb. This can be useful when
attempting to disassemble thumb code produced by other
compilers.
`-p'
`--private-headers'
Print information that is specific to the object file
format. The exact information printed depends upon
the object file format. For some object file formats,
no additional information is printed.
`-r'
`--reloc'
Print the relocation entries of the file. If used
with -d or -D, the relocations are printed inter
spersed with the disassembly.
`-R'
`--dynamic-reloc'
Print the dynamic relocation entries of the file.
This is only meaningful for dynamic objects, such as
certain types of shared libraries.
`-s'
`--full-contents'
Display the full contents of any sections requested.
`-S'
`--source'
Display source code intermixed with disassembly, if
possible. Implies -d.
`--show-raw-insn'
When disassembling instructions, print the instruction
in hex as well as in symbolic form. This is the
default except when `--prefix-addresses' is used.
When disassembling instructions, do not print the
instruction bytes. This is the default when `--pre
fix-addresses' is used.
`-G'
`--stabs'
Display the full contents of any sections requested.
Display the contents of the .stab and .stab.index and
.stab.excl sections from an ELF file. This is only
useful on systems (such as Solaris 2.0) in which
`.stab' debugging symbol-table entries are carried in
an ELF section. In most other file formats, debugging
symbol-table entries are interleaved with linkage sym
bols, and are visible in the --syms output.
`--start-address=address'
Start displaying data at the specified address. This
affects the output of the `-d', `-r' and `-s' options.
`--stop-address=address'
Stop displaying data at the specified address. This
affects the output of the `-d', `-r' and `-s' options.
`-t'
`--syms'
Print the symbol table entries of the file. This is
similar to the information provided by the nm program.
`-T'
`--dynamic-syms'
Print the dynamic symbol table entries of the file.
This is only meaningful for dynamic objects, such as
certain types of shared libraries. This is similar to
the information provided by the nm program when given
the -D (--dynamic) option.
`--version'
Print the version number of `objdump' and exit.
`-x'
`--all-header'
Display all available header information, including
the symbol table and relocation entries. Using -x is
equivalent to specifying all of -a -f -h -r -t.
`-w'
`--wide'
Format some lines for output devices that have more
SEE ALSO
nm(1), readelf(1), and the Info entries for binutils.
COPYRIGHT
Copyright (c) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000,
2001 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify
this document under the terms of the GNU Free Documenta
tion License, Version 1.1 or any later version published
by the Free Software Foundation; with no Invariant Sec
tions, with no Front-Cover Texts, and with no Back-Cover
Texts. A copy of the license is included in the section
entitled "GNU Free Documentation License".
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