SunOS man pages : objdump (1)
GNU Development Tools OBJDUMP(1)
NAME
objdump - display information from object files.
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
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alternatives, 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 be
given.
-a
--archive-header
If any of the objfile files 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 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
compilers. 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.
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-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-header
Display summary information from the overall header of
each of the objfile files.
--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 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
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file section headers cannot show the correct 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
information, 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.
Only supported on some targets.
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 name or the special register names).
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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 dissassembler 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.
-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.
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--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.
-G
--stabs
Display the full contents of any sections requested.
Display the contents of the .stab and .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
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
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--wide
Format some lines for output devices that have more than
80 columns. Also do not truncate symbol names when they
are displayed.
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 Documentation
License, Version 1.1 or any later version published by the
Free Software Foundation; with no Invariant Sections, 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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