Toll Free Numbers
  • Last 5 Forum Topics
    Last post

The Web Only This Site



  • MARC

    Mailing list ARChives
    - Search by -


    Computing Dictionary

  • Text Link Ads
  • LINUX man pages
  • Linux Man Page Viewer

    The following form allows you to view linux man pages.





           objdump [-a|--archive-headers]
                   [-b bfdname|--target=bfdname]
                   [-C|--demangle[=style] ]
                   [-EB|-EL|--endian={big | little }]
                   [-j section|--section=section]
                   [-m machine|--architecture=machine]
                   [-M options|--disassembler-options=options]


           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
               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
               Specify that the object-code format for the object files is
               bfdname.  This option 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.
               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
               Display debugging information.  This attempts to parse STABS and
               IEEE debugging format information stored in the file and print it
               out using a C like syntax.  If neither of these formats are found
               this option falls back on the -W option to print any DWARF
               information in the file.
               Like -g, but the information is generated in a format compatible
               with ctags tool.
               Display the assembler mnemonics for the machine instructions from
               objfile.  This option only disassembles those sections which are
               expected to contain instructions.
               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.
               Display summary information from the overall header of each of the
               objfile files.
               When disassembling sections, whenever a symbol is displayed, also
               display the file offset of the region of data that is about to be
               dumped.  If zeroes are being skipped, then when disassembly
               resumes, tell the user how many zeroes were skipped and the file
               offset of the location from where the disassembly resumes.  When
               dumping sections, display the file offset of the location from
               where the dump starts.
               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.
               Display summary information from the section headers of the object
               File segments may be relocated to nonstandard addresses, for
               example by using the -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
               Print a summary of the options to objdump and exit.
               Display a list showing all architectures and object formats
               available for specification with -b or -m.
           -j name
               Display information only for section name.
               additional effect.  It restricts the disassembly to only those
               instructions supported by the architecture specified by machine.
               If it is necessary to use this switch because the input file does
               not contain any architecture information, but it is also desired to
               disassemble all the instructions use -marm.
           -M 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.
               If the target is an ARM architecture then this switch can be used
               to select which register name set is used during disassembler.
               Specifying -M reg-names-std (the default) will select the register
               names as used in ARM's instruction set documentation, but with
               register 13 called 'sp', register 14 called 'lr' and register 15
               called 'pc'.  Specifying -M reg-names-apcs will select the name set
               used by the ARM Procedure Call Standard, whilst specifying -M reg-
               names-raw will just use r followed by the register number.
               There are also two variants on the APCS register naming scheme
               enabled by -M reg-names-atpcs and -M reg-names-special-atpcs which
               use the ARM/Thumb Procedure Call Standard naming conventions.
               (Either with the normal register names or the special register
               This option can also be used for ARM architectures to force the
               disassembler to interpret all instructions as Thumb instructions by
               using the switch --disassembler-options=force-thumb.  This can be
               useful when attempting to disassemble thumb code produced by other
               For the x86, some of the options duplicate functions of the -m
               switch, but allow finer grained control.  Multiple selections from
               the following may be specified as a comma separated string.
               x86-64, i386 and i8086 select disassembly for the given
               architecture.  intel and att select between intel syntax mode and
               AT&T syntax mode.  intel-mnemonic and att-mnemonic select between
               intel mnemonic mode and AT&T mnemonic mode. intel-mnemonic implies
               intel and att-mnemonic implies att.  addr64, addr32, addr16, data32
               and data16 specify the default address size and operand size.
               These four options will be overridden if x86-64, i386 or i8086
               appear later in the option string.  Lastly, suffix, when in AT&T
               mode, instructs the disassembler to print a mnemonic suffix even
               when the suffix could be inferred by the operands.
               For PowerPC, booke controls the disassembly of BookE instructions.
               32 and 64 select PowerPC and PowerPC64 disassembly, respectively.
               e300 selects disassembly for the e300 family.  440 selects
               disassembly for the PowerPC 440.  ppcps selects disassembly for the
                   the specified ABI.  By default, GPR names are selected
                   according to the ABI of the binary being disassembled.
                   Print FPR (floating-point register) names as appropriate for
                   the specified ABI.  By default, FPR numbers are printed rather
                   than names.
                   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.
                   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.
                   Print GPR and FPR names as appropriate for the selected ABI.
                   Print CPU-specific register names (CP0 register and HWR names)
                   as appropriate for the selected CPU or architecture.
               For any of the options listed above, ABI or ARCH may be specified
               as numeric to have numbers printed rather than names, for the
               selected types of registers.  You can list the available values of
               ABI and ARCH using the --help option.
               For VAX, you can specify function entry addresses with -M
               entry:0xf00ba.  You can use this multiple times to properly
               disassemble VAX binary files that don't contain symbol tables (like
               ROM dumps).  In these cases, the function entry mask would
               otherwise be decoded as VAX instructions, which would probably lead
               the rest of the function being wrongly disassembled.
               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.
               Print the relocation entries of the file.  If used with -d or -D,
               the relocations are printed interspersed with the disassembly.
               Specify prefix to add to the absolute paths when used with -S.
               Indicate how many initial directory names to strip off the
               hardwired absolute paths. It has no effect without --prefix=prefix.
               When disassembling instructions, print the instruction in hex as
               well as in symbolic form.  This is the default except when
               --prefix-addresses is used.
               When disassembling instructions, do not print the instruction
               bytes.  This is the default when --prefix-addresses is used.
               Display width bytes on a single line when disassembling
               Displays the contents of the debug sections in the file, if any are
               present.  If one of the optional letters or words follows the
               switch then only data found in those specific sections will be
               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 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.
               Print the symbol table entries of the file.  This is similar to the
               information provided by the nm program, although the display format
               is different.  The format of the output depends upon the format of
               the file being dumped, but there are two main types.  One looks
                       00000000 l    d  .bss   00000000 .bss
                       00000000 g       .text  00000000 fred
               Here the first number is the symbol's value (sometimes refered to
               as its address).  The next field is actually a set of characters
               and spaces indicating the flag bits that are set on the symbol.
               These characters are described below.  Next is the section with
               which the symbol is associated or *ABS* if the section is absolute
               (ie not connected with any section), or *UND* if the section is
               referenced in the file being dumped, but not defined there.
               After the section name comes another field, a number, which for
               common symbols is the alignment and for other symbol is the size.
               Finally the symbol's name is displayed.
               The flag characters are divided into 7 groups as follows:
               "!" The symbol is a local (l), global (g), unique global (u),
                   neither global nor local (a space) or both global and local
                   (!).  A symbol can be neither local or global for a variety of
                   reasons, e.g., because it is used for debugging, but it is
                   probably an indication of a bug if it is ever both local and
                   global.  Unique global symbols are a GNU extension to the
                   standard set of ELF symbol bindings.  For such a symbol the
                   dynamic linker will make sure that in the entire process there
                   is just one symbol with this name and type in use.
               "w" The symbol is weak (w) or strong (a space).
               "C" The symbol denotes a constructor (C) or an ordinary symbol (a
               "W" The symbol is a warning (W) or a normal symbol (a space).  A
                   warning symbol's name is a message to be displayed if the
                   symbol following the warning symbol is ever referenced.
               "i" The symbol is an indirect reference to another symbol (I), a
                   function to be evaluated during reloc processing (i) or a
                   normal symbol (a space).
               "D" The symbol is a debugging symbol (d) or a dynamic symbol (D) or
                   a normal symbol (a space).
               "O" The symbol is the name of a function (F) or a file (f) or an
               Print the version number of objdump and exit.
               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.
               Format some lines for output devices that have more than 80
               columns.  Also do not truncate symbol names when they are
               Normally the disassembly output will skip blocks of zeroes.  This
               option directs the disassembler to disassemble those blocks, just
               like any other data.
               Read command-line options from file.  The options read are inserted
               in place of the original @file option.  If file does not exist, or
               cannot be read, then the option will be treated literally, and not
               Options in file are separated by whitespace.  A whitespace
               character may be included in an option by surrounding the entire
               option in either single or double quotes.  Any character (including
               a backslash) may be included by prefixing the character to be
               included with a backslash.  The file may itself contain additional
               @file options; any such options will be processed recursively.


           nm(1), readelf(1), and the Info entries for binutils.


           Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
           2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 1.3 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".

  • Linux

    The Distributions


    The Software


    The News


  • Toll Free

Toll Free Numbers
Copyright © 1999 - 2016 by LinuxGuruz