objdump(1) GNU Development Tools objdump(1)NAMEobjdump - display information from object files.
SYNOPSISobjdump
[-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...
DESCRIPTIONobjdump displays information about one or more object files. The op‐
tions 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 ar‐
chives, 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 cor‐
respond to the symbol table, which can happen when putting sec‐
tions 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 bfd‐
name. This may not be necessary; objdump can automatically rec‐
ognize 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 for‐
mat 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 ob‐
ject 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 file‐
name 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 for‐
mat. 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 disassem‐
bly.
-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, de‐
bugging 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 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 in‐
formation provided by the `nm' program when given the -D (--dy‐
namic) 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 spec‐
ifying 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.
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the en‐
tire resulting derived work is distributed under the terms of a permis‐
sion notice identical to this one.
Permission is granted to copy and distribute translations of this manu‐
al into another language, under the above conditions for modified ver‐
sions, except that this permission notice may be included in transla‐
tions approved by the Free Software Foundation instead of in the origi‐
nal English.
cygnus support 5 November 1991 objdump(1)
