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]
	       [-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.

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  informa-
	   tion 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 rec-
	   ognize 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 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 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.  Spec-
	   ifying -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 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 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 according 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) 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.

       -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 -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.

       -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.

       -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 -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, 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''.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWbinutils    |
       +--------------------+-----------------+
       |Interface Stability | External	      |
       +--------------------+-----------------+
NOTES

       Source for GNU binutils is available on http://opensolaris.org.

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