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objdump - display information from object files.
- objdump
- [-a|--archive-headers] [-b bfdname | --target=bfdname] [-C|--demangle] [--debugging] [-d|--disassemble]
[-D|--disassemble-all] [--disassemble-zeroes] [-EB|-EL|--endian={big|little}] [-f|--file-headers]
[-h|--section-headers | --headers] [-i|--info] [-j section | --section=section] [-l|--line-numbers]
[-m machine | --architecture=machine] [-p|--private-headers] [--prefix-addresses] [-r|--reloc]
[-R|--dynamic-reloc] [-s|--full-contents] [-S|--source] [--[no-]show-raw-insn] [--stabs] [-t|--syms]
[-T|--dynamic-syms] [-x|--all-headers] [--start-address=address] [--stop-address=address]
[--adjust-vma=offset] [--version] [--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.
Where long and short forms of an
option are shown together, they are equivalent. At least one option besides
-l (--line-numbers) must be given.
- -a
- --archive-headers
- If any files from objfile
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 the object-code format for the object files to be bfdname. This
may not be necessary; objdump can automatically recognize many formats.
For example,
objdump -b oasys -m vax -h fu.o
display 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
- 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.
- --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.
- -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-headers
- Display summary information from the overall header of each
file in objfile.
- -h
- --section-headers
- --headers
- Display summary information from
the section headers of the object file.
- --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 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.
- -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.
- --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.
- --stabs
- Display the contents of the .stab, .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
- Symbol Table. Print the symbol table entries of the file. This is
similar to the information provided by the `nm' program.
- -T
- --dynamic-syms
- Dynamic
Symbol Table. 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-headers
- 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'.
`binutils' entry in info; The
GNU Binary Utilities, Roland H. Pesch (October 1991); nm(1)
.
Copyright
(c) 1991, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
Permission
is granted to make and distribute verbatim copies of this manual provided
the copyright notice and this permission notice are preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the entire
resulting derived work is distributed under the terms of a permission notice
identical to this one.
Permission is granted to copy and distribute translations
of this manual into another language, under the above conditions for modified
versions, except that this permission notice may be included in translations
approved by the Free Software Foundation instead of in the original English.
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