File: binutils.info, Node: objdump, Next: ranlib, Prev: objcopy, Up: Top
4 objdump
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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]
[`-V'|`--version']
[`-H'|`--help']
OBJFILE...
`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.
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. *Note Target Selection::,
for more information.
`-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. *Note c++filt::, for more information on demangling.
`-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'.
*Note readelf::.
`-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 register names in
disassembled instructions. Multiple selections from the following
may be specified as a comma separated string, and invalid options
are ignored:
`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. For more information on stabs symbols, see
*Note Stabs: (stabs.info)Top.
`--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.
`-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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