binutils.info: objcopy

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objcopy

     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]
             [`-G' SYMBOLNAME|`--keep-global-symbol='SYMBOLNAME]
             [`-L' SYMBOLNAME|`--localize-symbol='SYMBOLNAME]
             [`-W' SYMBOLNAME|`--weaken-symbol='SYMBOLNAME]
             [`-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]]
             [`--change-leading-char' ] [`--remove-leading-char']
             [`--srec-len='IVAL ] [`--srec-forceS3']
             [`--redefine-sym' OLD=NEW ]
             [`--weaken']
             [`--keep-symbols='FILENAME]
             [`--strip-symbols='FILENAME]
             [`--keep-global-symbols='FILENAME]
             [`--localize-symbols='FILENAME]
             [`--weaken-symbols='FILENAME]
             [`--alt-machine-code=INDEX']
             [`-v'|`--verbose']
             [`-V'|`--version']
             [`--help']
             INFILE [OUTFILE]
   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.  *Note BFD:
(ld.info)BFD.
   `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 (eg `srec').
`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'
     Consider the source file's object format to be BFDNAME, rather than
     attempting to deduce it.  *Note Target Selection::, for more
     information.
`-O BFDNAME'
`--output-target=BFDNAME'
     Write the output file using the object format BFDNAME.  *Note
     Target Selection::, for more information.
`-F BFDNAME'
`--target=BFDNAME'
     Use BFDNAME as the object format for both the input and the output
     file; i.e., simply transfer data from source to destination with no
     translation.  *Note Target Selection::, for more information.
`-B BFDARCH'
`--binary-architecture=BFDARCH'
     Useful when transforming a raw binary 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 from the source file.
`--strip-unneeded'
     Strip all symbols that are not needed for relocation processing.
`-K SYMBOLNAME'
`--keep-symbol=SYMBOLNAME'
     Copy only symbol SYMBOLNAME from the source file.  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.
`-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
     may be given more than once.
`-L SYMBOLNAME'
`--localize-symbol=SYMBOLNAME'
     Make symbol SYMBOLNAME local to the file, so that it is not
     visible externally.  This option may be given more than once.
`-W SYMBOLNAME'
`--weaken-symbol=SYMBOLNAME'
     Make symbol SYMBOLNAME weak. This option may be given more than
     once.
`-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
     default because only certain debugging formats are supported, and
     the conversion process can be time consuming.
`--gap-fill VAL'
     Fill gaps between sections with VAL.  This operation applies to
     the _load address_ (LMA) of the sections.  It is done by increasing
     the size of the section with the lower address, and filling in the
     extra space created with VAL.
`--pad-to ADDRESS'
     Pad the output file up to the load address ADDRESS.  This is done
     by increasing the size of the last section.  The extra space is
     filled in with the value specified by `--gap-fill' (default zero).
`--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.
`--change-warnings'
`--adjust-warnings'
     If `--change-section-address' or `--change-section-lma' or
     `--change-section-vma' is used, and the named section does not
     exist, issue a warning.  This is the default.
`--no-change-warnings'
`--no-adjust-warnings'
     Do not issue a warning if `--change-section-address' or
     `--adjust-section-lma' or `--adjust-section-vma' is used, even if
     the named section does not exist.
`--set-section-flags SECTION=FLAGS'
     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>
`--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.
`--remove-leading-char'
     If the first character of a global symbol is a special symbol
     leading character used by the object file format, remove the
     character.  The most common symbol leading character is
     underscore.  This option will remove a leading underscore from all
     global symbols.  This can be useful if you want to link together
     objects of different file formats with different conventions for
     symbol names.  This is different from `--change-leading-char'
     because it always changes the symbol name when appropriate,
     regardless of the object file format of the output file.
`--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.
`--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'
     Apply `--keep-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.
`--strip-symbols=FILENAME'
     Apply `--strip-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.
`--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.
`--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.
`-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'.