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Provided by: binutils-avr_2.16.1-1_i386

 

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  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
        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
            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 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
        -EL
        --endian={big     little}
            Specify the endianness of the object files.  This only affects dis‐
            assembly.   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 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
            names as used in ARM’s instruction set documentation, but with reg‐
            ister 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  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 instruction mneu‐
            monic names and register names in disassembled instructions.   Mul‐
            tiple  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 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)
                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.
 
        --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  ta‐
            ble  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 dis‐
            played.
 
        -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.
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 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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