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
list -a,-d,-D,-f,-g,-G,-h,-H,-p,-r,-R,-S,-t,-T,-V,-x must
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
debugging information have been implemented.
-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.
--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.
File segments may be relocated to nonstandard
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 cor
rect 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.
ing 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 name 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 --disassem
bler-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 speci
fied 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 regis
ter names in disassembled instructions. Multiple
selections from the following may be specified as a
comma separated string, and invalid options are
ignored:
"gpr-names=ABI"
Print GPR (general-purpose register) names as
appropriate for the specified ABI. By default,
GPR names are selected according to the ABI of the
binary being disassembled.
"fpr-names=ABI"
Print FPR (floating-point register) names as
appropriate for the specified ABI. By default,
FPR numbers are printed rather than names.
"cp0-names=ARCH"
Print CP0 (system control coprocessor; coprocessor
0) register names as appropriate for the CPU or
architecture specified by ARCH. By default, CP0
register names are selected according to the
"reg-names=ARCH"
Print CPU-specific register names (CP0 register
and HWR names) as appropriate for the selected CPU
or architecture.
For 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
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.
--no-show-raw-insn
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.
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
than 80 columns. Also do not truncate symbol names
when they are displayed.
-z
--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.
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, 2002 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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