Provided by: binutils-m68hc1x_2.18-9_amd64 
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]
[-e|--debugging-tags]
[-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]
[-W|--dwarf]
[-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]
[--special-syms]
[-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 alternatives, are equivalent. At least one option
from the list -a,-d,-D,-e,-f,-g,-G,-h,-H,-p,-r,-R,-s,-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. Some other types are supported by readelf -w.
-e
--debugging-tags
Like -g, but the information is generated in a format compatible with ctags tool.
-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.
-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 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-headers
--headers
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 file section headers cannot show the correct addresses. Instead, it
shows the usual addresses, which are implicit for the target.
-H
--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 it is
necessary to specify more than one disassembler option then multiple -M options can be used or can be
placed together into a comma separated list.
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-names-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 names 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 --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. addr64, 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. e300 selects disassembly for the e300 family. 440
selects disassembly for the PowerPC 440.
For MIPS, this option controls the printing of instruction mnemonic names and register names in
disassembled instructions. Multiple selections from the following may be specified as a comma
separated string, and invalid options are ignored:
"no-aliases"
Print the 'raw' instruction mnemonic instead of some pseudo instruction mnemonic. I.e., print
'daddu' or 'or' instead of 'move', 'sll' instead of 'nop', etc.
"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
architecture and CPU of the binary being disassembled.
"hwr-names=ARCH"
Print HWR (hardware register, used by the "rdhwr" instruction) names as appropriate for the CPU
or architecture specified by ARCH. By default, HWR names are selected according to the
architecture and CPU of the binary being disassembled.
"reg-names=ABI"
Print GPR and FPR names as appropriate for the selected ABI.
"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.
For VAX, you can specify function entry addresses with -M entry:0xf00ba. You can use this multiple
times to properly disassemble VAX binary files that don't contain symbol tables (like ROM dumps). In
these cases, the function entry mask would otherwise be decoded as VAX instructions, which would
probably lead the rest of the function being wrongly disassembled.
-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. By default all non-empty sections are
displayed.
-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.
-W
--dwarf
Displays the contents of the DWARF debug sections in the file, if any are present.
-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.
--special-syms
When displaying symbols include those which the target considers to be special in some way and which
would not normally be of interest to the user.
-V
--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 -p -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
disassemble those blocks, just like any other data.
@file
Read command-line options from file. The options read are inserted in place of the original @file
option. If file does not exist, or cannot be read, then the option will be treated literally, and
not removed.
Options in file are separated by whitespace. A whitespace character may be included in an option by
surrounding the entire option in either single or double quotes. Any character (including a
backslash) may be included by prefixing the character to be included with a backslash. The file may
itself contain additional @file options; any such options will be processed recursively.
SEE ALSO
nm(1), readelf(1), and the Info entries for binutils.
COPYRIGHT
Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
2006, 2007 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".