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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]
	       [-V|--version]
	       [-H|--help]
	       objfile...

DESCRIPTION

       objdump	displays  information  about  one  or  more object files.  The
       options control what particular information to display.	This  informa-
       tion 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 ar-
       chives, objdump shows information on each of the member object files.

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.

	   When  dumping  information,	first  add  offset  to all the section
	   addresses.  This is useful if the section addresses do  not	corre-
	   spond  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 bfd-
	   name.  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 com-
	   piler.

       -g
       --debugging
	   Display  debugging  information.   This attempts to parse debugging
	   information stored in the file and print it out using a C like syn-
	   tax.   Only certain types of debugging information have been imple-
	   mented.  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

	   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  exam-
	   ple	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 target.

       -H
       --help
	   Print a summary of the options to objdump and exit.

       -i
       --info
	   Display a list showing all architectures and object formats	avail-
	   able 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  sup-
	   ported  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
	   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 architec-
	   ture.  intel and att select between intel syntax mode and AT&T syn-
	   tax	mode.	addr32,  addr16, data32 and data16 specify the default
	   address size and operand size.  These four options will be overrid-
	   den	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  register  names  in
	   disassembled  instructions.	Multiple selections from the following
	   may be specified as a comma separated string, and  invalid  options
	   are ignored:

	   "gpr-names=ABI"
	       Print  GPR  (general-purpose register) names as appropriate for
	       the specified ABI.  By default, GPR names are selected  accord-
	       ing to the ABI of the binary being disassembled.

	   "fpr-names=ABI"
	       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)

       --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 -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 --pre-
	   fix-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.

       --version
	   Print the version number of objdump and exit.

       -x
       --all-headers
	   Display  all available header information, including the symbol ta-
	   ble and relocation entries.	Using -x is equivalent	to  specifying
	   all of -a -f -h -r -t.

       -w
       --wide
	   Format  some  lines	for output devices that have more than 80 col-
	   umns.  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, 92, 93, 94, 95, 96, 97, 98, 99, 2000,  2001,  2002,
       2003 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''.

binutils-2.14.91		  2004-04-09			    OBJDUMP(1)

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