MirOS Manual: objdump(1)


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.

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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.

         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.

     -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

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         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.

         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

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         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 target.

     -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.

         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-name-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

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         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 names).

         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 compilers.

         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.  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 PPC, booke, booke32 and booke64 select disassembly
         of BookE instructions.  32 and 64 select PowerPC and
         PowerPC64 disassembly, respectively.

         For MIPS, this option controls the printing of
         instruction mneumonic names and register names in
         disassembled instructions.  Multiple selections from the
         following may be specified as a comma separated string,
         and invalid options are ignored:

         "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"

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             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.

         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 the rest of
         the function being wrongly disassembled.

     -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

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         -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.

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     -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, 2005 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''.

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