Provided by: binutils_2.18.1~cvs20080103-0ubuntu1_i386 bug


       objdump - display information from object files.


       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
       archives, objdump shows information on each of the member object files.


       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.

           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.

           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  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.

           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.

           Like -d, but disassemble the contents of  all  sections,  not  just
           those expected to contain instructions.

           When  disassembling, print the complete address on each line.  This
           is the older disassembly format.

           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.

           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.

           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
           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
           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.   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 PPC, booke, booke32 and booke64  select  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.

           For MIPS, this option controls the printing of instruction mnemonic
           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:

               Print the ’raw’ instruction mnemonic  instead  of  some  pseudo
               instruction  mnemonic.   I.e., print ’daddu’ or ’or’ instead of
               ’move’, ’sll’ instead of ’nop’, etc.

               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.

               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.

           Print the dynamic relocation entries of the  file.   This  is  only
           meaningful  for  dynamic  objects,  such as certain types of shared

           Display the full contents of any sections  requested.   By  default
           all non-empty sections are displayed.

           Display  source  code  intermixed  with  disassembly,  if possible.
           Implies -d.

           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.

           Displays  the  contents of the DWARF debug sections in the file, if
           any are present.

           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.

           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.

           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.

           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.


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       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
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