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
] [-e
|--debugging-tags
] [-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...
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.
The long and short forms of options, shown here as alternatives, are equivalent. At least one option from the list -a,-d,-D,-e,-f,-g,-G,-h,-H,-p,-r,-R,-s,-S,-t,-T,-V,-x
must be given.
-a
--archive-header
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-b
bfdname--target=
bfdnameFor 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 compilers. You can list the formats available with the -i
option. See Target Selection, for more information.
-C
--demangle[=
style]
-g
--debugging
readelf -w
. See readelf.-e
--debugging-tags
-g
, but the information is generated in a format compatible with ctags tool.-d
--disassemble
-D
--disassemble-all
-d
, but disassemble the contents of all sections, not just those expected to contain instructions.--prefix-addresses
-EB
-EL
--endian={big|little}
-f
--file-headers
--file-start-context
-S
) from a file that has not yet been displayed, extend the context to the start of the file.-h
--section-headers
--headers
File segments may be relocated to nonstandard addresses, for example by using the -Ttext
, -Tdata
, or -Tbss
options to ld
. However, some object file formats, 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.
-H
--help
objdump
and exit.-i
--info
-b
or -m
.-j
name--section=
name-l
--line-numbers
-d
, -D
, or -r
.-m
machine--architecture=
machine-i
option.-M
options--disassembler-options=
options-M
options can be used or can be placed together into a comma separated list.
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 select the name set used by the ARM Procedure Call 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 naming scheme enabled by -M reg-names-atpcs
and -M reg-names-special-atpcs
which use the ARM/Thumb Procedure Call Standard naming conventions. (Either with the normal register names or 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 --disassembler-options=force-thumb
. This can be useful when attempting to disassemble thumb code produced by other compilers.
For the x86, some of the options duplicate functions of the -m
switch, but allow finer grained control. Multiple selections from the following may be specified as a comma separated string. x86-64
, i386
and i8086
select disassembly for the given architecture. intel
and att
select between intel syntax mode and AT&T syntax mode. addr32
, addr16
, data32
and data16
specify the default address size and operand size. These four options will be overridden if x86-64
, i386
or i8086
appear later in the option string. Lastly, suffix
, when in AT&T mode, instructs the disassembler to print a mnemonic suffix even when the suffix could be inferred by the operands.
For PPC, booke
, booke32
and booke64
select disassembly of BookE instructions. 32
and 64
select PowerPC and PowerPC64 disassembly, respectively.
For MIPS, this option controls the printing of register names in disassembled instructions. Multiple selections from the following may be specified as a comma separated string, and invalid options are ignored:
gpr-names=
ABIfpr-names=
ABIcp0-names=
ARCHhwr-names=
ARCHrdhwr
instruction) names as appropriate for the CPU or architecture specified by ARCH. By default, HWR names are selected according to the architecture and CPU of the binary being disassembled.reg-names=
ABIreg-names=
ARCHFor any of the options listed above, ABI or ARCH may be specified as numeric
to have numbers printed rather than names, for the selected types of registers. You can list the available values of ABI and ARCH using the --help
option.
-p
--private-headers
-r
--reloc
-d
or -D
, the relocations are printed interspersed with the disassembly.-R
--dynamic-reloc
-s
--full-contents
-S
--source
-d
.--show-raw-insn
--prefix-addresses
is used.--no-show-raw-insn
--prefix-addresses
is used.-G
--stabs
.stab
debugging symbol-table entries are carried in an ELF section. In most other file formats, debugging symbol-table entries are interleaved with linkage symbols, and are visible in the --syms
output. For more information on stabs symbols, see Stabs.--start-address=
address-d
, -r
and -s
options.--stop-address=
address-d
, -r
and -s
options.-t
--syms
nm
program.-T
--dynamic-syms
nm
program when given the -D
(--dynamic
) option.-V
--version
objdump
and exit.-x
--all-headers
-x
is equivalent to specifying all of -a -f -h -r -t
.-w
--wide
-z
--disassemble-zeroes