objdump [ -a | --archive-headers
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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
besides ‘-l’
must be given.
-b
bfdname
--debugging
-d
-D
-f
-h
--help
-i
-j name
-l
-m machine
-r
-R
-s
-S
--show-raw-insn
--stabs
--start-address=address
--stop-address=address
-t
-T
--version
-x
-w
[ -b bfdname | --target=bfdname ] [ --debugging ]
[ -d | --disassemble ] [ -D | --disassemble-all ]
[ -f | --file-headers ]
[ -h | --section-headers | --headers ]
[ -i | --info ]
[ -j section | --section=section ]
[ -l | --line-numbers ] [ -S | --source ]
[ -m machine | --architecture=machine ]
[ -r | --reloc ] [ -R | --dynamic-reloc ]
[ -s | --full-contents ] [ --stabs ]
[ -t | --syms ] [ -T | --dynamic-syms ]
[ -x | --all-headers ]
[ -w | --wide ] [ --start-address=address ]
[ --stop-address=address ]
[ --show-raw-insn ]
[ --version ]
[ --help ]
objfile...
-a
0
--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.
--target=bfdname
Specify that the object-code
format for the object files is BFD-name. This option may not be necessary;
objdump
can automatically recognize many formats.
objdump -b oasys -m vax -h fu.o
The previous example 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. See Target
Selection for more information.
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.
--disassemble
Display the assembler mnemonics
for the machine instructions from objfile.
This option only disassembles those sections which are expected to contain
instructions.
--disassemble-all
Like ‘-d’,
but disassemble the contents of all sections, not just those expected to
contain instructions.
--file-header
Display summary information
from the overall header of each of the objfile
files.
--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 ‘
ffb
-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.Print a summary of the options
to objdump
and exit.
--info
Display a list showing all
architectures and object formats available for specification with ‘-b’
or ‘-m’.
--section=name
Display information only
for section name.
--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’
or ‘-D’.
--architecture=machine
Specify that the object
files objfile
are for architecture machine.
You can list available architectures using the ‘-i’
option.
--reloc
Print the relocation entries
of the file. If used with ‘-d’
or ‘-D’,
the relocations are printed interspersed with the disassembly.
--dynamic-reloc
Print the dynamic relocation
entries of the file. This is only meaningful for dynamic objects, such
as certain types of shared libraries.
--full-contents
Display the full contents
of any sections requested.
--source
Display source code intermixed
with disassembly, if possible.
Implies ‘-d’.When disassembling instructions,
print the instruction in hex as well as in symbolic form. Not all targets
handle this correctly yet.
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 the directives, .stabd,
.stabn, .stabs
in “Assembler Directives”
in Using AS.
Start displaying data at
the specified address. This affects the output of the -d,
-r
and -s
options.
Stop displaying data at
the specified address. This affects the output of the -d,
-r
and -s
options.
--syms
Print the symbol table entries
of the file. This is similar to the information provided by the ‘nm’
program.
--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.
Print the version number
of objdump
and exit.
--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’.
--wide
Format some lines for output
devices having more than 80 columns.