objdump

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
COPYING

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.

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 entire resulting derived work is distributed under the terms of a permission notice identical to this one.

Permission is granted to copy and distribute translations of this manual into another language, under the above conditions for modified versions, except that this permission notice may be included in translations approved by the Free Software Foundation instead of in the original English.