objdump(1)

NAME
objdump - display information from object files.

SYNOPSIS

objdump
    [-a|--archive-headers] [-b bfdname | --target= bfdname ] [-C|--demangle] [--debugging] [-d|--disassemble] [-D|--disassemble-all] [--disassemble-zeroes] [-EB|-EL|--endian= {big|little} ] [-f|--file-headers] [-h|--section-headers | --headers] [-i|--info] [-j section | --section= section ] [-l|--line-numbers] [-m machine | --architecture= machine ] [-p|--private-headers] [--prefix-addresses] [-r|--reloc] [-R|--dynamic-reloc] [-s|--full-contents] [-S|--source] [--[no-]show-raw-insn] [--stabs] [-t|--syms] [-T|--dynamic-syms] [-x|--all-headers] [--start-address= address ] [--stop-address= address ] [--adjust-vma= offset ] [--version] [--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
Where long and short forms of an option are shown together, they are equivalent. At least one option besides -l (--line-numbers) must be given.

-a

--archive-headers
    If any files from objfile 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 the object-code format for the object files to be bfdname . This may not be necessary; objdump can automatically recognize many formats. For example,

    objdump -b oasys -m vax -h fu.o

    display 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.

-C

--demangle
    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.

--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 disassembles 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 disassemble 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 disassembling a file format which does not describe endianness information, such as S-records.

-f

--file-headers
    Display summary information from the overall header of each file in objfile .

-h

--section-headers

--headers
    Display summary information from the section headers of the object file.

--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 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 information, such as S-records. You can list the available architectures with the -i 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 interspersed 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 --prefix-addresses is used.

--stabs
    Display the contents of the .stab, .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 symbols, 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
    Symbol Table. Print the symbol table entries of the file. This is similar to the information provided by the `nm ' program.

-T

--dynamic-syms
    Dynamic Symbol Table. 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-headers
    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 '.

SEE ALSO
`binutils' entry in info; The GNU Binary Utilities, Roland H. Pesch (October 1991); nm(1).

COPYING
Copyright (c) 1991, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.

This document is distributed under the terms of the GNU Free Documentation License, version 1.1. That license is described in the sources for this manual page, but it is not displayed here in order to make this manual more consise. Copies of this license can also be obtained from: http://www.gnu.org/copyleft/.