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PROGRAM:

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]
[-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-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 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.
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.

For MIPS, this option controls the printing of instruction mneumonic 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 mneumonic instead of some pseudo instruction
mneumonic. 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.

-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.

-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.

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