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] [--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.
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-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.
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-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.
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-d |
--disassemble
Display the assembler mnemonics for the machine instructions from objfile. This option only disassembles those sections which are expected to contain instructions.
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-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.
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-EB |
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-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.
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-f |
--file-headers
Display summary information from the overall header of each file in objfile.
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-h |
--section-headers
--headers
Display summary information from the section headers of the object file.
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--help |
Print a summary of the options to objdump and exit. | ||
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-i |
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--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.
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-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 disasembling object files which do not describe architecture information, such as S-records. You can list the available architectures with the -i option.
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-r |
--reloc
Print the relocation entries of the file. If used with -d or -d, the relocations are printed interspersed with the disassembly.
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-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.
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-s |
--full-contents
Display the full contents of any sections requested.
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-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.
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-t |
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--syms |
Symbol Table. Print the symbol table entries of the file. This is similar to the information provided by the ’nm’ program. | ||
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-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.
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-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.
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