NAME
objcopy - copy and translate object files
SYNOPSIS
objcopy |
[ -F bfdname | --target=bfdname ] [ -I bfdname | --input-target=bfdname ] |
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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.
objcopy creates temporary files to do its translations and deletes them afterward. objcopy uses BFD to do all its
translation work; it knows about all the formats BFD knows about, 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 virtual address When generating an S-record or a raw binary file, it may be helpful to use -S to remove sections containing infile and outfile are the source and output files respectively. If you do not specify outfile, objcopy creates a |
OPTIONS
-I bfdname, --input-target=bfdname
Consider the source file's object format to be bfdname, rather than attempting to deduce it.
-O bfdname, --output-target=bfdname
Write the output file using the object format bfdname.
-F bfdname, --target=bfdname -j sectionname, --only-section=sectionname |
Copy only the named section from the input file to the output file, discarding all other -R sectionname, --remove-section=sectionname |
Remove the named section from the 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 -N symbolname, --strip-symbol=symbolname |
Do not copy symbol symbolname from the source file. This option may be given more than
once. -L symbolname, --localize-symbol=symbolname -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 -b byte, --byte=byte |
Keep only every byteth byte of the input file (header data is not affected). byte can be in -i interleave, --interleave=interleave |
Only copy one out of every interleave bytes. Which one to copy is selected by the -b or -p, --preserve-dates |
Set the access and modification dates of the output file to be the same as those of the input |
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--debugging |
Convert debugging information, if possible. This is not the default because only certain |
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--gap-fill=val |
Fill gaps between sections with val. This operation applies to the load address (LMA) of |
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--pad-to=address |
Pad the output file up to the load address address. This is done by increasing the size of the |
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--set-start=val |
Set the start address of the new file to val. Not all object file formats support setting the |
--change-start=incr, --adjust-start=incr --change-addresses=incr, --adjust-vma=incr |
Changes the address 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 --change-section-lma section{=,+,-}val |
Set or change 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-vma section{=,+,-}val
Set or change the VMA 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-warnings, --adjust-warnings
If --change-section-XXX is used, and the named section does not exist, issue a warning. |
--no-change-warnings, --no-adjust-warnings --set-section-flags section=flags |
Set the flags for the named section. The flags argument is a comma separated string of flag --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. |
--change-leading-char
Some object file formats use special characters at the start of symbols. The most common |
--remove-leading-char
If the first character of a global symbol is a special symbol leading character used by the --redefine-sym old=new |
Change the name of symbol old to new. This can be useful when one is trying link two |
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--weaken -v, --verbose |
Change all global symbols in the file to be weak. Verbose output: list all object files modified. In the case of archives, "objcopy -V" lists all |
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-V, --version --help |
Show the version number of objcopy and exit. Show a summary of the options to objcopy and exit. |
SEE ALSO
` binutils ' entry in info; The GNU Binary Utilities, Roland H. Pesch (June 1993).
COPYING
Copyright (c) 1993, 94, 95, 96, 97, 98, 1999 Free Software Foundation, Inc.
Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this
permission notice are preserved on all copies.
Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim
copying, provided that the entire resulting derived work is distributed under the terms of a permission notice
identical to this one.
Permission is granted to copy and distribute translations of this manual into another language, under the above
conditions for modified versions, except that this permission notice may be included in translations approved by the
Free Software Foundation instead of in the original English.