OBJDUMP(1) | GNU Development Tools | OBJDUMP(1) |
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.
objdump -b oasys -m vax -h fu.o
- -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.
- -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.
- "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.
- -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.
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 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''.2005-04-20 | binutils-2.15.97 |