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UNIX/LINUX Command – objdump

Last updated Apr 25, 2021


objdump—Display information from object files.


objdump [ –a|–archive–headers ][–b\ bfdname | –target= bfdname ][ –d|–disassemble][–D|–disassemble-all ][–f|–file–headers ][ –h|–section–headers | –headers ][–i|–info ][–j\ section| –section= section ][–l|–line–numbers ][–m\ machine | —architecture= machine ][–r|–reloc ][–R|–dynamic–reloc ][ –s|–full–contents ][–stabs ][–t|–syms ][–T|–dynamic–syms][–x|–all–headers ][–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.

Option Description
–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.
–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 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.
–d, –disassemble Display the assembler mnemonics for the machine instructions from objfile. This option only disassembles those sections that are expected to contain instructions.
–D, –disassemble-all Like –d, but disassemble the contents of all sections, not just those expected to contain instructions.
–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 or –D.
–m machine, –architecture=machine Specify the object files objfile are for architecture machine. You can list available architec-tures using the –i option.
–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.
–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.
–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.

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