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    Command:

    objcopy

    
    
    

    SYNOPSIS

           objcopy [-F bfdname|--target=bfdname]
                   [-I bfdname|--input-target=bfdname]
                   [-O bfdname|--output-target=bfdname]
                   [-B bfdarch|--binary-architecture=bfdarch]
                   [-S|--strip-all]
                   [-g|--strip-debug]
                   [-K symbolname|--keep-symbol=symbolname]
                   [-N symbolname|--strip-symbol=symbolname]
                   [--strip-unneeded-symbol=symbolname]
                   [-G symbolname|--keep-global-symbol=symbolname]
                   [--localize-hidden]
                   [-L symbolname|--localize-symbol=symbolname]
                   [--globalize-symbol=symbolname]
                   [-W symbolname|--weaken-symbol=symbolname]
                   [-w|--wildcard]
                   [-x|--discard-all]
                   [-X|--discard-locals]
                   [-b byte|--byte=byte]
                   [-i interleave|--interleave=interleave]
                   [-j sectionname|--only-section=sectionname]
                   [-R sectionname|--remove-section=sectionname]
                   [-p|--preserve-dates]
                   [--debugging]
                   [--gap-fill=val]
                   [--pad-to=address]
                   [--set-start=val]
                   [--adjust-start=incr]
                   [--change-addresses=incr]
                   [--change-section-address section{=,+,-}val]
                   [--change-section-lma section{=,+,-}val]
                   [--change-section-vma section{=,+,-}val]
                   [--change-warnings] [--no-change-warnings]
                   [--set-section-flags section=flags]
                   [--add-section sectionname=filename]
                   [--rename-section oldname=newname[,flags]]
                   [--long-section-names {enable,disable,keep}]
                   [--change-leading-char] [--remove-leading-char]
                   [--reverse-bytes=num]
                   [--srec-len=ival] [--srec-forceS3]
                   [--redefine-sym old=new]
                   [--redefine-syms=filename]
                   [--weaken]
                   [--keep-symbols=filename]
                   [--strip-symbols=filename]
                   [--strip-unneeded-symbols=filename]
                   [--keep-global-symbols=filename]
                   [--localize-symbols=filename]
                   [--globalize-symbols=filename]
                   [--weaken-symbols=filename]
                   [--alt-machine-code=index]
                   [--prefix-symbols=string]
                   [--stack=size]
                   [--subsystem=which:major.minor]
                   [-v|--verbose]
                   [-V|--version]
                   [--help] [--info]
                   infile [outfile]
    
    
    

    DESCRIPTION

           The GNU objcopy utility copies the contents of an object file to
           another.  objcopy uses the GNU BFD Library to read and write the object
           files.  It can write the destination object file in a format different
           from that of the source object file.  The exact behavior of objcopy is
           controlled by command-line options.  Note that objcopy should be able
           to copy a fully linked file between any two formats. However, copying a
           relocatable object file between any two formats may not work as
           expected.
    
           objcopy creates temporary files to do its translations and deletes them
           afterward.  objcopy uses BFD to do all its translation work; it has
           access to all the formats described in BFD and thus is able to
           recognize most formats without being told explicitly.
    
           objcopy can be used to generate S-records by using an output target of
           srec (e.g., use -O srec).
    
           objcopy can be used to generate a raw binary file by using an output
           target of binary (e.g., use -O binary).  When objcopy generates a raw
           binary file, it will essentially produce a memory dump of the contents
           of the input object file.  All symbols and relocation information will
           be discarded.  The memory dump will start at the load address of the
           lowest section copied into the output file.
    
           When generating an S-record or a raw binary file, it may be helpful to
           use -S to remove sections containing debugging information.  In some
           cases -R will be useful to remove sections which contain information
           that is not needed by the binary file.
    
           Note---objcopy is not able to change the endianness of its input files.
           If the input format has an endianness (some formats do not), objcopy
           can only copy the inputs into file formats that have the same
           endianness or which have no endianness (e.g., srec).  (However, see the
           --reverse-bytes option.)
    
    
    

    OPTIONS

           infile
           outfile
               The input and output files, respectively.  If you do not specify
               outfile, objcopy creates a temporary file and destructively renames
               the result with the name of infile.
    
           -I bfdname
           --input-target=bfdname
           --binary-architecture=bfdarch
               Useful when transforming a architecture-less input file into an
               object file.  In this case the output architecture can be set to
               bfdarch.  This option will be ignored if the input file has a known
               bfdarch.  You can access this binary data inside a program by
               referencing the special symbols that are created by the conversion
               process.  These symbols are called _binary_objfile_start,
               _binary_objfile_end and _binary_objfile_size.  e.g. you can
               transform a picture file into an object file and then access it in
               your code using these symbols.
    
           -j sectionname
           --only-section=sectionname
               Copy only the named section from the input file to the output file.
               This option may be given more than once.  Note that using this
               option inappropriately may make the output file unusable.
    
           -R sectionname
           --remove-section=sectionname
               Remove any section named sectionname from the output file.  This
               option may be given more than once.  Note that using this option
               inappropriately may make the output file unusable.
    
           -S
           --strip-all
               Do not copy relocation and symbol information from the source file.
    
           -g
           --strip-debug
               Do not copy debugging symbols or sections from the source file.
    
           --strip-unneeded
               Strip all symbols that are not needed for relocation processing.
    
           -K symbolname
           --keep-symbol=symbolname
               When stripping symbols, keep symbol symbolname even if it would
               normally be stripped.  This option may be given more than once.
    
           -N symbolname
           --strip-symbol=symbolname
               Do not copy symbol symbolname from the source file.  This option
               may be given more than once.
    
           --strip-unneeded-symbol=symbolname
               Do not copy symbol symbolname from the source file unless it is
               needed by a relocation.  This option may be given more than once.
    
           -G symbolname
           --keep-global-symbol=symbolname
               Keep only symbol symbolname global.  Make all other symbols local
               to the file, so that they are not visible externally.  This option
               Make symbol symbolname weak. This option may be given more than
               once.
    
           --globalize-symbol=symbolname
               Give symbol symbolname global scoping so that it is visible outside
               of the file in which it is defined.  This option may be given more
               than once.
    
           -w
           --wildcard
               Permit regular expressions in symbolnames used in other command
               line options.  The question mark (?), asterisk (*), backslash (\)
               and square brackets ([]) operators can be used anywhere in the
               symbol name.  If the first character of the symbol name is the
               exclamation point (!) then the sense of the switch is reversed for
               that symbol.  For example:
    
                         -w -W !foo -W fo*
    
               would cause objcopy to weaken all symbols that start with "fo"
               except for the symbol "foo".
    
           -x
           --discard-all
               Do not copy non-global symbols from the source file.
    
           -X
           --discard-locals
               Do not copy compiler-generated local symbols.  (These usually start
               with L or ..)
    
           -b byte
           --byte=byte
               Keep only every byteth byte of the input file (header data is not
               affected).  byte can be in the range from 0 to interleave-1, where
               interleave is given by the -i or --interleave option, or the
               default of 4.  This option is useful for creating files to program
               ROM.  It is typically used with an "srec" output target.
    
           -i interleave
           --interleave=interleave
               Only copy one out of every interleave bytes.  Select which byte to
               copy with the -b or --byte option.  The default is 4.  objcopy
               ignores this option if you do not specify either -b or --byte.
    
           -p
           --preserve-dates
               Set the access and modification dates of the output file to be the
               same as those of the input file.
    
           --debugging
               Convert debugging information, if possible.  This is not the
    
           --set-start val
               Set the start address of the new file to val.  Not all object file
               formats support setting the start address.
    
           --change-start incr
           --adjust-start incr
               Change the start address by adding incr.  Not all object file
               formats support setting the start address.
    
           --change-addresses incr
           --adjust-vma incr
               Change the VMA and LMA addresses of all sections, as well as the
               start address, by adding incr.  Some object file formats do not
               permit section addresses to be changed arbitrarily.  Note that this
               does not relocate the sections; if the program expects sections to
               be loaded at a certain address, and this option is used to change
               the sections such that they are loaded at a different address, the
               program may fail.
    
           --change-section-address section{=,+,-}val
           --adjust-section-vma section{=,+,-}val
               Set or change both the VMA address and the LMA address of the named
               section.  If = is used, the section address is set to val.
               Otherwise, val is added to or subtracted from the section address.
               See the comments under --change-addresses, above. If section does
               not exist in the input file, a warning will be issued, unless
               --no-change-warnings is used.
    
           --change-section-lma section{=,+,-}val
               Set or change the LMA address of the named section.  The LMA
               address is the address where the section will be loaded into memory
               at program load time.  Normally this is the same as the VMA
               address, which is the address of the section at program run time,
               but on some systems, especially those where a program is held in
               ROM, the two can be different.  If = is used, the section address
               is set to val.  Otherwise, val is added to or subtracted from the
               section address.  See the comments under --change-addresses, above.
               If section does not exist in the input file, a warning will be
               issued, unless --no-change-warnings is used.
    
           --change-section-vma section{=,+,-}val
               Set or change the VMA address of the named section.  The VMA
               address is the address where the section will be located once the
               program has started executing.  Normally this is the same as the
               LMA address, which is the address where the section will be loaded
               into memory, but on some systems, especially those where a program
               is held in ROM, the two can be different.  If = is used, the
               section address is set to val.  Otherwise, val is added to or
               subtracted from the section address.  See the comments under
               --change-addresses, above.  If section does not exist in the input
               file, a warning will be issued, unless --no-change-warnings is
               used.
               Set the flags for the named section.  The flags argument is a comma
               separated string of flag names.  The recognized names are alloc,
               contents, load, noload, readonly, code, data, rom, share, and
               debug.  You can set the contents flag for a section which does not
               have contents, but it is not meaningful to clear the contents flag
               of a section which does have contents--just remove the section
               instead.  Not all flags are meaningful for all object file formats.
    
           --add-section sectionname=filename
               Add a new section named sectionname while copying the file.  The
               contents of the new section are taken from the file filename.  The
               size of the section will be the size of the file.  This option only
               works on file formats which can support sections with arbitrary
               names.
    
           --rename-section oldname=newname[,flags]
               Rename a section from oldname to newname, optionally changing the
               section's flags to flags in the process.  This has the advantage
               over usng a linker script to perform the rename in that the output
               stays as an object file and does not become a linked executable.
    
               This option is particularly helpful when the input format is
               binary, since this will always create a section called .data.  If
               for example, you wanted instead to create a section called .rodata
               containing binary data you could use the following command line to
               achieve it:
    
                         objcopy -I binary -O <output_format> -B <architecture> \
                          --rename-section .data=.rodata,alloc,load,readonly,data,contents \
                          <input_binary_file> <output_object_file>
    
           --long-section-names {enable,disable,keep}
               Controls the handling of long section names when processing "COFF"
               and "PE-COFF" object formats.  The default behaviour, keep, is to
               preserve long section names if any are present in the input file.
               The enable and disable options forcibly enable or disable the use
               of long section names in the output object; when disable is in
               effect, any long section names in the input object will be
               truncated.  The enable option will only emit long section names if
               any are present in the inputs; this is mostly the same as keep, but
               it is left undefined whether the enable option might force the
               creation of an empty string table in the output file.
    
           --change-leading-char
               Some object file formats use special characters at the start of
               symbols.  The most common such character is underscore, which
               compilers often add before every symbol.  This option tells objcopy
               to change the leading character of every symbol when it converts
               between object file formats.  If the object file formats use the
               same leading character, this option has no effect.  Otherwise, it
               will add a character, or remove a character, or change a character,
               as appropriate.
               length must be evenly divisible by the value given in order for the
               swap to be able to take place. Reversing takes place before the
               interleaving is performed.
    
               This option is used typically in generating ROM images for
               problematic target systems.  For example, on some target boards,
               the 32-bit words fetched from 8-bit ROMs are re-assembled in
               little-endian byte order regardless of the CPU byte order.
               Depending on the programming model, the endianness of the ROM may
               need to be modified.
    
               Consider a simple file with a section containing the following
               eight bytes:  12345678.
    
               Using --reverse-bytes=2 for the above example, the bytes in the
               output file would be ordered 21436587.
    
               Using --reverse-bytes=4 for the above example, the bytes in the
               output file would be ordered 43218765.
    
               By using --reverse-bytes=2 for the above example, followed by
               --reverse-bytes=4 on the output file, the bytes in the second
               output file would be ordered 34127856.
    
           --srec-len=ival
               Meaningful only for srec output.  Set the maximum length of the
               Srecords being produced to ival.  This length covers both address,
               data and crc fields.
    
           --srec-forceS3
               Meaningful only for srec output.  Avoid generation of S1/S2
               records, creating S3-only record format.
    
           --redefine-sym old=new
               Change the name of a symbol old, to new.  This can be useful when
               one is trying link two things together for which you have no
               source, and there are name collisions.
    
           --redefine-syms=filename
               Apply --redefine-sym to each symbol pair "old new" listed in the
               file filename.  filename is simply a flat file, with one symbol
               pair per line.  Line comments may be introduced by the hash
               character.  This option may be given more than once.
    
           --weaken
               Change all global symbols in the file to be weak.  This can be
               useful when building an object which will be linked against other
               objects using the -R option to the linker.  This option is only
               effective when using an object file format which supports weak
               symbols.
    
           --keep-symbols=filename
               name per line.  Line comments may be introduced by the hash
               character.  This option may be given more than once.
    
           --keep-global-symbols=filename
               Apply --keep-global-symbol option to each symbol listed in the file
               filename.  filename is simply a flat file, with one symbol name per
               line.  Line comments may be introduced by the hash character.  This
               option may be given more than once.
    
           --localize-symbols=filename
               Apply --localize-symbol option to each symbol listed in the file
               filename.  filename is simply a flat file, with one symbol name per
               line.  Line comments may be introduced by the hash character.  This
               option may be given more than once.
    
           --globalize-symbols=filename
               Apply --globalize-symbol option to each symbol listed in the file
               filename.  filename is simply a flat file, with one symbol name per
               line.  Line comments may be introduced by the hash character.  This
               option may be given more than once.
    
           --weaken-symbols=filename
               Apply --weaken-symbol option to each symbol listed in the file
               filename.  filename is simply a flat file, with one symbol name per
               line.  Line comments may be introduced by the hash character.  This
               option may be given more than once.
    
           --alt-machine-code=index
               If the output architecture has alternate machine codes, use the
               indexth code instead of the default one.  This is useful in case a
               machine is assigned an official code and the tool-chain adopts the
               new code, but other applications still depend on the original code
               being used.  For ELF based architectures if the index alternative
               does not exist then the value is treated as an absolute number to
               be stored in the e_machine field of the ELF header.
    
           --writable-text
               Mark the output text as writable.  This option isn't meaningful for
               all object file formats.
    
           --readonly-text
               Make the output text write protected.  This option isn't meaningful
               for all object file formats.
    
           --pure
               Mark the output file as demand paged.  This option isn't meaningful
               for all object file formats.
    
           --impure
               Mark the output file as impure.  This option isn't meaningful for
               all object file formats.
    
           --keep-file-symbols
               When stripping a file, perhaps with --strip-debug or
               --strip-unneeded, retain any symbols specifying source file names,
               which would otherwise get stripped.
    
           --only-keep-debug
               Strip a file, removing contents of any sections that would not be
               stripped by --strip-debug and leaving the debugging sections
               intact.  In ELF files, this preserves all note sections in the
               output.
    
               The intention is that this option will be used in conjunction with
               --add-gnu-debuglink to create a two part executable.  One a
               stripped binary which will occupy less space in RAM and in a
               distribution and the second a debugging information file which is
               only needed if debugging abilities are required.  The suggested
               procedure to create these files is as follows:
    
               1.<Link the executable as normal.  Assuming that is is called>
                   "foo" then...
    
               1.<Run "objcopy --only-keep-debug foo foo.dbg" to>
                   create a file containing the debugging info.
    
               1.<Run "objcopy --strip-debug foo" to create a>
                   stripped executable.
    
               1.<Run "objcopy --add-gnu-debuglink=foo.dbg foo">
                   to add a link to the debugging info into the stripped
                   executable.
    
               Note---the choice of ".dbg" as an extension for the debug info file
               is arbitrary.  Also the "--only-keep-debug" step is optional.  You
               could instead do this:
    
               1.<Link the executable as normal.>
               1.<Copy "foo" to  "foo.full">
               1.<Run "objcopy --strip-debug foo">
               1.<Run "objcopy --add-gnu-debuglink=foo.full foo">
    
               i.e., the file pointed to by the --add-gnu-debuglink can be the
               full executable.  It does not have to be a file created by the
               --only-keep-debug switch.
    
               Note---this switch is only intended for use on fully linked files.
               It does not make sense to use it on object files where the
               debugging information may be incomplete.  Besides the gnu_debuglink
               feature currently only supports the presence of one filename
               containing debugging information, not multiple filenames on a one-
               per-object-file basis.
    
           --file-alignment num
               of your dlls, each should have a unique base address and not
               overlap any other dlls.  The default is 0x400000 for executables,
               and 0x10000000 for dlls.  [This option is specific to PE targets.]
    
           --section-alignment num
               Sets the section alignment.  Sections in memory will always begin
               at addresses which are a multiple of this number.  Defaults to
               0x1000.  [This option is specific to PE targets.]
    
           --stack reserve
           --stack reserve,commit
               Specify the number of bytes of memory to reserve (and optionally
               commit) to be used as stack for this program.  [This option is
               specific to PE targets.]
    
           --subsystem which
           --subsystem which:major
           --subsystem which:major.minor
               Specifies the subsystem under which your program will execute.  The
               legal values for which are "native", "windows", "console", "posix",
               "efi-app", "efi-bsd", "efi-rtd", "sal-rtd", and "xbox".  You may
               optionally set the subsystem version also.  Numeric values are also
               accepted for which.  [This option is specific to PE targets.]
    
           --extract-symbol
               Keep the file's section flags and symbols but remove all section
               data.  Specifically, the option:
    
               *<removes the contents of all sections;>
               *<sets the size of every section to zero; and>
               *<sets the file's start address to zero.>
    
               This option is used to build a .sym file for a VxWorks kernel.  It
               can also be a useful way of reducing the size of a --just-symbols
               linker input file.
    
           -V
           --version
               Show the version number of objcopy.
    
           -v
           --verbose
               Verbose output: list all object files modified.  In the case of
               archives, objcopy -V lists all members of the archive.
    
           --help
               Show a summary of the options to objcopy.
    
           --info
               Display a list showing all architectures and object formats
               available.
    
           ld(1), objdump(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, 2006, 2007, 2008, 2009 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 1.3 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-2.20.51.0.2 2015-07-23 OBJCOPY(1)

    
    
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