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.\" ========================================================================

.\"

.IX Title "OBJCOPY 1"

.TH OBJCOPY 1 "2009-10-16" "binutils-2.20" "GNU Development Tools"

.\" For nroff, turn off justification.  Always turn off hyphenation; it makes

.\" way too many mistakes in technical documents.

.if n .ad l

.nh

.SH "NAME"

objcopy \- copy and translate object files

.SH "SYNOPSIS"

.IX Header "SYNOPSIS"

objcopy [\fB\-F\fR \fIbfdname\fR|\fB\-\-target=\fR\fIbfdname\fR]

        [\fB\-I\fR \fIbfdname\fR|\fB\-\-input\-target=\fR\fIbfdname\fR]

        [\fB\-O\fR \fIbfdname\fR|\fB\-\-output\-target=\fR\fIbfdname\fR]

        [\fB\-B\fR \fIbfdarch\fR|\fB\-\-binary\-architecture=\fR\fIbfdarch\fR]

        [\fB\-S\fR|\fB\-\-strip\-all\fR]

        [\fB\-g\fR|\fB\-\-strip\-debug\fR]

        [\fB\-K\fR \fIsymbolname\fR|\fB\-\-keep\-symbol=\fR\fIsymbolname\fR]

        [\fB\-N\fR \fIsymbolname\fR|\fB\-\-strip\-symbol=\fR\fIsymbolname\fR]

        [\fB\-\-strip\-unneeded\-symbol=\fR\fIsymbolname\fR]

        [\fB\-G\fR \fIsymbolname\fR|\fB\-\-keep\-global\-symbol=\fR\fIsymbolname\fR]

        [\fB\-\-localize\-hidden\fR]

        [\fB\-L\fR \fIsymbolname\fR|\fB\-\-localize\-symbol=\fR\fIsymbolname\fR]

        [\fB\-\-globalize\-symbol=\fR\fIsymbolname\fR]

        [\fB\-W\fR \fIsymbolname\fR|\fB\-\-weaken\-symbol=\fR\fIsymbolname\fR]

        [\fB\-w\fR|\fB\-\-wildcard\fR]

        [\fB\-x\fR|\fB\-\-discard\-all\fR]

        [\fB\-X\fR|\fB\-\-discard\-locals\fR]

        [\fB\-b\fR \fIbyte\fR|\fB\-\-byte=\fR\fIbyte\fR]

        [\fB\-i\fR \fIinterleave\fR|\fB\-\-interleave=\fR\fIinterleave\fR]

        [\fB\-j\fR \fIsectionname\fR|\fB\-\-only\-section=\fR\fIsectionname\fR]

        [\fB\-R\fR \fIsectionname\fR|\fB\-\-remove\-section=\fR\fIsectionname\fR]

        [\fB\-p\fR|\fB\-\-preserve\-dates\fR]

        [\fB\-\-debugging\fR]

        [\fB\-\-gap\-fill=\fR\fIval\fR]

        [\fB\-\-pad\-to=\fR\fIaddress\fR]

        [\fB\-\-set\-start=\fR\fIval\fR]

        [\fB\-\-adjust\-start=\fR\fIincr\fR]

        [\fB\-\-change\-addresses=\fR\fIincr\fR]

        [\fB\-\-change\-section\-address\fR \fIsection\fR{=,+,\-}\fIval\fR]

        [\fB\-\-change\-section\-lma\fR \fIsection\fR{=,+,\-}\fIval\fR]

        [\fB\-\-change\-section\-vma\fR \fIsection\fR{=,+,\-}\fIval\fR]

        [\fB\-\-change\-warnings\fR] [\fB\-\-no\-change\-warnings\fR]

        [\fB\-\-set\-section\-flags\fR \fIsection\fR=\fIflags\fR]

        [\fB\-\-add\-section\fR \fIsectionname\fR=\fIfilename\fR]

        [\fB\-\-rename\-section\fR \fIoldname\fR=\fInewname\fR[,\fIflags\fR]]

        [\fB\-\-long\-section\-names\fR {enable,disable,keep}]

        [\fB\-\-change\-leading\-char\fR] [\fB\-\-remove\-leading\-char\fR]

        [\fB\-\-reverse\-bytes=\fR\fInum\fR]

        [\fB\-\-srec\-len=\fR\fIival\fR] [\fB\-\-srec\-forceS3\fR]

        [\fB\-\-redefine\-sym\fR \fIold\fR=\fInew\fR]

        [\fB\-\-redefine\-syms=\fR\fIfilename\fR]

        [\fB\-\-weaken\fR]

        [\fB\-\-keep\-symbols=\fR\fIfilename\fR]

        [\fB\-\-strip\-symbols=\fR\fIfilename\fR]

        [\fB\-\-strip\-unneeded\-symbols=\fR\fIfilename\fR]

        [\fB\-\-keep\-global\-symbols=\fR\fIfilename\fR]

        [\fB\-\-localize\-symbols=\fR\fIfilename\fR]

        [\fB\-\-globalize\-symbols=\fR\fIfilename\fR]

        [\fB\-\-weaken\-symbols=\fR\fIfilename\fR]

        [\fB\-\-alt\-machine\-code=\fR\fIindex\fR]

        [\fB\-\-prefix\-symbols=\fR\fIstring\fR]

        [\fB\-\-prefix\-sections=\fR\fIstring\fR]

        [\fB\-\-prefix\-alloc\-sections=\fR\fIstring\fR]

        [\fB\-\-add\-gnu\-debuglink=\fR\fIpath-to-file\fR]

        [\fB\-\-keep\-file\-symbols\fR]

        [\fB\-\-only\-keep\-debug\fR]

        [\fB\-\-extract\-symbol\fR]

        [\fB\-\-writable\-text\fR]

        [\fB\-\-readonly\-text\fR]

        [\fB\-\-pure\fR]

        [\fB\-\-impure\fR]

        [\fB\-\-file\-alignment=\fR\fInum\fR]

        [\fB\-\-heap=\fR\fIsize\fR]

        [\fB\-\-image\-base=\fR\fIaddress\fR]

        [\fB\-\-section\-alignment=\fR\fInum\fR]

        [\fB\-\-stack=\fR\fIsize\fR]

        [\fB\-\-subsystem=\fR\fIwhich\fR:\fImajor\fR.\fIminor\fR]

        [\fB\-v\fR|\fB\-\-verbose\fR]

        [\fB\-V\fR|\fB\-\-version\fR]

        [\fB\-\-help\fR] [\fB\-\-info\fR]

        \fIinfile\fR [\fIoutfile\fR]

.SH "DESCRIPTION"

.IX Header "DESCRIPTION"

The \s-1GNU\s0 \fBobjcopy\fR utility copies the contents of an object

file to another.  \fBobjcopy\fR uses the \s-1GNU\s0 \s-1BFD\s0 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 \fBobjcopy\fR is controlled by command-line options.

Note that \fBobjcopy\fR 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.

.PP

\&\fBobjcopy\fR creates temporary files to do its translations and

deletes them afterward.  \fBobjcopy\fR uses \s-1BFD\s0 to do all its

translation work; it has access to all the formats described in \s-1BFD\s0

and thus is able to recognize most formats without being told

explicitly.

.PP

\&\fBobjcopy\fR can be used to generate S\-records by using an output

target of \fBsrec\fR (e.g., use \fB\-O srec\fR).

.PP

\&\fBobjcopy\fR can be used to generate a raw binary file by using an

output target of \fBbinary\fR (e.g., use \fB\-O binary\fR).  When

\&\fBobjcopy\fR 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.

.PP

When generating an S\-record or a raw binary file, it may be helpful to

use \fB\-S\fR to remove sections containing debugging information.  In

some cases \fB\-R\fR will be useful to remove sections which contain

information that is not needed by the binary file.

.PP

Note\-\-\-\fBobjcopy\fR is not able to change the endianness of its input

files.  If the input format has an endianness (some formats do not),

\&\fBobjcopy\fR can only copy the inputs into file formats that have the

same endianness or which have no endianness (e.g., \fBsrec\fR).

(However, see the \fB\-\-reverse\-bytes\fR option.)

.SH "OPTIONS"

.IX Header "OPTIONS"

.IP "\fIinfile\fR" 4

.IX Item "infile"

.PD 0

.IP "\fIoutfile\fR" 4

.IX Item "outfile"

.PD

The input and output files, respectively.

If you do not specify \fIoutfile\fR, \fBobjcopy\fR creates a

temporary file and destructively renames the result with

the name of \fIinfile\fR.

.IP "\fB\-I\fR \fIbfdname\fR" 4

.IX Item "-I bfdname"

.PD 0

.IP "\fB\-\-input\-target=\fR\fIbfdname\fR" 4

.IX Item "--input-target=bfdname"

.PD

Consider the source file's object format to be \fIbfdname\fR, rather than

attempting to deduce it.

.IP "\fB\-O\fR \fIbfdname\fR" 4

.IX Item "-O bfdname"

.PD 0

.IP "\fB\-\-output\-target=\fR\fIbfdname\fR" 4

.IX Item "--output-target=bfdname"

.PD

Write the output file using the object format \fIbfdname\fR.

.IP "\fB\-F\fR \fIbfdname\fR" 4

.IX Item "-F bfdname"

.PD 0

.IP "\fB\-\-target=\fR\fIbfdname\fR" 4

.IX Item "--target=bfdname"

.PD

Use \fIbfdname\fR as the object format for both the input and the output

file; i.e., simply transfer data from source to destination with no

translation.

.IP "\fB\-B\fR \fIbfdarch\fR" 4

.IX Item "-B bfdarch"

.PD 0

.IP "\fB\-\-binary\-architecture=\fR\fIbfdarch\fR" 4

.IX Item "--binary-architecture=bfdarch"

.PD

Useful when transforming a raw binary input file into an object file.

In this case the output architecture can be set to \fIbfdarch\fR. This

option will be ignored if the input file has a known \fIbfdarch\fR. 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_\fIobjfile\fR_start, _binary_\fIobjfile\fR_end and

_binary_\fIobjfile\fR_size.  e.g. you can transform a picture file into

an object file and then access it in your code using these symbols.

.IP "\fB\-j\fR \fIsectionname\fR" 4

.IX Item "-j sectionname"

.PD 0

.IP "\fB\-\-only\-section=\fR\fIsectionname\fR" 4

.IX Item "--only-section=sectionname"

.PD

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.

.IP "\fB\-R\fR \fIsectionname\fR" 4

.IX Item "-R sectionname"

.PD 0

.IP "\fB\-\-remove\-section=\fR\fIsectionname\fR" 4

.IX Item "--remove-section=sectionname"

.PD

Remove any section named \fIsectionname\fR from the output file.  This

option may be given more than once.  Note that using this option

inappropriately may make the output file unusable.

.IP "\fB\-S\fR" 4

.IX Item "-S"

.PD 0

.IP "\fB\-\-strip\-all\fR" 4

.IX Item "--strip-all"

.PD

Do not copy relocation and symbol information from the source file.

.IP "\fB\-g\fR" 4

.IX Item "-g"

.PD 0

.IP "\fB\-\-strip\-debug\fR" 4

.IX Item "--strip-debug"

.PD

Do not copy debugging symbols or sections from the source file.

.IP "\fB\-\-strip\-unneeded\fR" 4

.IX Item "--strip-unneeded"

Strip all symbols that are not needed for relocation processing.

.IP "\fB\-K\fR \fIsymbolname\fR" 4

.IX Item "-K symbolname"

.PD 0

.IP "\fB\-\-keep\-symbol=\fR\fIsymbolname\fR" 4

.IX Item "--keep-symbol=symbolname"

.PD

When stripping symbols, keep symbol \fIsymbolname\fR even if it would

normally be stripped.  This option may be given more than once.

.IP "\fB\-N\fR \fIsymbolname\fR" 4

.IX Item "-N symbolname"

.PD 0

.IP "\fB\-\-strip\-symbol=\fR\fIsymbolname\fR" 4

.IX Item "--strip-symbol=symbolname"

.PD

Do not copy symbol \fIsymbolname\fR from the source file.  This option

may be given more than once.

.IP "\fB\-\-strip\-unneeded\-symbol=\fR\fIsymbolname\fR" 4

.IX Item "--strip-unneeded-symbol=symbolname"

Do not copy symbol \fIsymbolname\fR from the source file unless it is needed

by a relocation.  This option may be given more than once.

.IP "\fB\-G\fR \fIsymbolname\fR" 4

.IX Item "-G symbolname"

.PD 0

.IP "\fB\-\-keep\-global\-symbol=\fR\fIsymbolname\fR" 4

.IX Item "--keep-global-symbol=symbolname"

.PD

Keep only symbol \fIsymbolname\fR global.  Make all other symbols local

to the file, so that they are not visible externally.  This option may

be given more than once.

.IP "\fB\-\-localize\-hidden\fR" 4

.IX Item "--localize-hidden"

In an \s-1ELF\s0 object, mark all symbols that have hidden or internal visibility

as local.  This option applies on top of symbol-specific localization options

such as \fB\-L\fR.

.IP "\fB\-L\fR \fIsymbolname\fR" 4

.IX Item "-L symbolname"

.PD 0

.IP "\fB\-\-localize\-symbol=\fR\fIsymbolname\fR" 4

.IX Item "--localize-symbol=symbolname"

.PD

Make symbol \fIsymbolname\fR local to the file, so that it is not

visible externally.  This option may be given more than once.

.IP "\fB\-W\fR \fIsymbolname\fR" 4

.IX Item "-W symbolname"

.PD 0

.IP "\fB\-\-weaken\-symbol=\fR\fIsymbolname\fR" 4

.IX Item "--weaken-symbol=symbolname"

.PD

Make symbol \fIsymbolname\fR weak. This option may be given more than once.

.IP "\fB\-\-globalize\-symbol=\fR\fIsymbolname\fR" 4

.IX Item "--globalize-symbol=symbolname"

Give symbol \fIsymbolname\fR global scoping so that it is visible

outside of the file in which it is defined.  This option may be given

more than once.

.IP "\fB\-w\fR" 4

.IX Item "-w"

.PD 0

.IP "\fB\-\-wildcard\fR" 4

.IX Item "--wildcard"

.PD

Permit regular expressions in \fIsymbolname\fRs used in other command

line options.  The question mark (?), asterisk (*), backslash (\e) 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:

.Sp

.Vb 1

\&          \-w \-W !foo \-W fo*

.Ve

.Sp

would cause objcopy to weaken all symbols that start with \*(L"fo\*(R"

except for the symbol \*(L"foo\*(R".

.IP "\fB\-x\fR" 4

.IX Item "-x"

.PD 0

.IP "\fB\-\-discard\-all\fR" 4

.IX Item "--discard-all"

.PD

Do not copy non-global symbols from the source file.

.IP "\fB\-X\fR" 4

.IX Item "-X"

.PD 0

.IP "\fB\-\-discard\-locals\fR" 4

.IX Item "--discard-locals"

.PD

Do not copy compiler-generated local symbols.

(These usually start with \fBL\fR or \fB.\fR.)

.IP "\fB\-b\fR \fIbyte\fR" 4

.IX Item "-b byte"

.PD 0

.IP "\fB\-\-byte=\fR\fIbyte\fR" 4

.IX Item "--byte=byte"

.PD

Keep only every \fIbyte\fRth byte of the input file (header data is not

affected).  \fIbyte\fR can be in the range from 0 to \fIinterleave\fR\-1,

where \fIinterleave\fR is given by the \fB\-i\fR or \fB\-\-interleave\fR

option, or the default of 4.  This option is useful for creating files

to program \s-1ROM\s0.  It is typically used with an \f(CW\*(C`srec\*(C'\fR output

target.

.IP "\fB\-i\fR \fIinterleave\fR" 4

.IX Item "-i interleave"

.PD 0

.IP "\fB\-\-interleave=\fR\fIinterleave\fR" 4

.IX Item "--interleave=interleave"

.PD

Only copy one out of every \fIinterleave\fR bytes.  Select which byte to

copy with the \fB\-b\fR or \fB\-\-byte\fR option.  The default is 4.

\&\fBobjcopy\fR ignores this option if you do not specify either \fB\-b\fR or

\&\fB\-\-byte\fR.

.IP "\fB\-p\fR" 4

.IX Item "-p"

.PD 0

.IP "\fB\-\-preserve\-dates\fR" 4

.IX Item "--preserve-dates"

.PD

Set the access and modification dates of the output file to be the same

as those of the input file.

.IP "\fB\-\-debugging\fR" 4

.IX Item "--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.

.IP "\fB\-\-gap\-fill\fR \fIval\fR" 4

.IX Item "--gap-fill val"

Fill gaps between sections with \fIval\fR.  This operation applies to

the \fIload address\fR (\s-1LMA\s0) 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 \fIval\fR.

.IP "\fB\-\-pad\-to\fR \fIaddress\fR" 4

.IX Item "--pad-to address"

Pad the output file up to the load address \fIaddress\fR.  This is

done by increasing the size of the last section.  The extra space is

filled in with the value specified by \fB\-\-gap\-fill\fR (default zero).

.IP "\fB\-\-set\-start\fR \fIval\fR" 4

.IX Item "--set-start val"

Set the start address of the new file to \fIval\fR.  Not all object file

formats support setting the start address.

.IP "\fB\-\-change\-start\fR \fIincr\fR" 4

.IX Item "--change-start incr"

.PD 0

.IP "\fB\-\-adjust\-start\fR \fIincr\fR" 4

.IX Item "--adjust-start incr"

.PD

Change the start address by adding \fIincr\fR.  Not all object file

formats support setting the start address.

.IP "\fB\-\-change\-addresses\fR \fIincr\fR" 4

.IX Item "--change-addresses incr"

.PD 0

.IP "\fB\-\-adjust\-vma\fR \fIincr\fR" 4

.IX Item "--adjust-vma incr"

.PD

Change the \s-1VMA\s0 and \s-1LMA\s0 addresses of all sections, as well as the start

address, by adding \fIincr\fR.  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.

.IP "\fB\-\-change\-section\-address\fR \fIsection\fR\fB{=,+,\-}\fR\fIval\fR" 4

.IX Item "--change-section-address section{=,+,-}val"

.PD 0

.IP "\fB\-\-adjust\-section\-vma\fR \fIsection\fR\fB{=,+,\-}\fR\fIval\fR" 4

.IX Item "--adjust-section-vma section{=,+,-}val"

.PD

Set or change both the \s-1VMA\s0 address and the \s-1LMA\s0 address of the named

\&\fIsection\fR.  If \fB=\fR is used, the section address is set to

\&\fIval\fR.  Otherwise, \fIval\fR is added to or subtracted from the

section address.  See the comments under \fB\-\-change\-addresses\fR,

above. If \fIsection\fR does not exist in the input file, a warning will

be issued, unless \fB\-\-no\-change\-warnings\fR is used.

.IP "\fB\-\-change\-section\-lma\fR \fIsection\fR\fB{=,+,\-}\fR\fIval\fR" 4

.IX Item "--change-section-lma section{=,+,-}val"

Set or change the \s-1LMA\s0 address of the named \fIsection\fR.  The \s-1LMA\s0

address is the address where the section will be loaded into memory at

program load time.  Normally this is the same as the \s-1VMA\s0 address, which

is the address of the section at program run time, but on some systems,

especially those where a program is held in \s-1ROM\s0, the two can be

different.  If \fB=\fR is used, the section address is set to

\&\fIval\fR.  Otherwise, \fIval\fR is added to or subtracted from the

section address.  See the comments under \fB\-\-change\-addresses\fR,

above.  If \fIsection\fR does not exist in the input file, a warning

will be issued, unless \fB\-\-no\-change\-warnings\fR is used.

.IP "\fB\-\-change\-section\-vma\fR \fIsection\fR\fB{=,+,\-}\fR\fIval\fR" 4

.IX Item "--change-section-vma section{=,+,-}val"

Set or change the \s-1VMA\s0 address of the named \fIsection\fR.  The \s-1VMA\s0

address is the address where the section will be located once the

program has started executing.  Normally this is the same as the \s-1LMA\s0

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

\&\s-1ROM\s0, the two can be different.  If \fB=\fR is used, the section address

is set to \fIval\fR.  Otherwise, \fIval\fR is added to or subtracted

from the section address.  See the comments under

\&\fB\-\-change\-addresses\fR, above.  If \fIsection\fR does not exist in

the input file, a warning will be issued, unless

\&\fB\-\-no\-change\-warnings\fR is used.

.IP "\fB\-\-change\-warnings\fR" 4

.IX Item "--change-warnings"

.PD 0

.IP "\fB\-\-adjust\-warnings\fR" 4

.IX Item "--adjust-warnings"

.PD

If \fB\-\-change\-section\-address\fR or \fB\-\-change\-section\-lma\fR or

\&\fB\-\-change\-section\-vma\fR is used, and the named section does not

exist, issue a warning.  This is the default.

.IP "\fB\-\-no\-change\-warnings\fR" 4

.IX Item "--no-change-warnings"

.PD 0

.IP "\fB\-\-no\-adjust\-warnings\fR" 4

.IX Item "--no-adjust-warnings"

.PD

Do not issue a warning if \fB\-\-change\-section\-address\fR or

\&\fB\-\-adjust\-section\-lma\fR or \fB\-\-adjust\-section\-vma\fR is used, even

if the named section does not exist.

.IP "\fB\-\-set\-section\-flags\fR \fIsection\fR\fB=\fR\fIflags\fR" 4

.IX Item "--set-section-flags section=flags"

Set the flags for the named section.  The \fIflags\fR argument is a

comma separated string of flag names.  The recognized names are

\&\fBalloc\fR, \fBcontents\fR, \fBload\fR, \fBnoload\fR,

\&\fBreadonly\fR, \fBcode\fR, \fBdata\fR, \fBrom\fR, \fBshare\fR, and

\&\fBdebug\fR.  You can set the \fBcontents\fR flag for a section which

does not have contents, but it is not meaningful to clear the

\&\fBcontents\fR flag of a section which does have contents\*(--just remove

the section instead.  Not all flags are meaningful for all object file

formats.

.IP "\fB\-\-add\-section\fR \fIsectionname\fR\fB=\fR\fIfilename\fR" 4

.IX Item "--add-section sectionname=filename"

Add a new section named \fIsectionname\fR while copying the file.  The

contents of the new section are taken from the file \fIfilename\fR.  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.

.IP "\fB\-\-rename\-section\fR \fIoldname\fR\fB=\fR\fInewname\fR\fB[,\fR\fIflags\fR\fB]\fR" 4

.IX Item "--rename-section oldname=newname[,flags]"

Rename a section from \fIoldname\fR to \fInewname\fR, optionally

changing the section's flags to \fIflags\fR 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.

.Sp

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:

.Sp

.Vb 3

\&          objcopy \-I binary \-O  \-B  \e

\&           \-\-rename\-section .data=.rodata,alloc,load,readonly,data,contents \e

\&            

.Ve

.IP "\fB\-\-long\-section\-names {enable,disable,keep}\fR" 4

.IX Item "--long-section-names {enable,disable,keep}"

Controls the handling of long section names when processing \f(CW\*(C`COFF\*(C'\fR

and \f(CW\*(C`PE\-COFF\*(C'\fR object formats.  The default behaviour, \fBkeep\fR,

is to preserve long section names if any are present in the input file.

The \fBenable\fR and \fBdisable\fR options forcibly enable or disable

the use of long section names in the output object; when \fBdisable\fR

is in effect, any long section names in the input object will be truncated.

The \fBenable\fR option will only emit long section names if any are

present in the inputs; this is mostly the same as \fBkeep\fR, but it

is left undefined whether the \fBenable\fR option might force the

creation of an empty string table in the output file.

.IP "\fB\-\-change\-leading\-char\fR" 4

.IX Item "--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 \fBobjcopy\fR 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.

.IP "\fB\-\-remove\-leading\-char\fR" 4

.IX Item "--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

\&\fB\-\-change\-leading\-char\fR because it always changes the symbol name

when appropriate, regardless of the object file format of the output

file.

.IP "\fB\-\-reverse\-bytes=\fR\fInum\fR" 4

.IX Item "--reverse-bytes=num"

Reverse the bytes in a section with output contents.  A section 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.

.Sp

This option is used typically in generating \s-1ROM\s0 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 \s-1CPU\s0 byte order.  Depending on the programming model, the

endianness of the \s-1ROM\s0 may need to be modified.

.Sp

Consider a simple file with a section containing the following eight

bytes:  \f(CW12345678\fR.

.Sp

Using \fB\-\-reverse\-bytes=2\fR for the above example, the bytes in the

output file would be ordered \f(CW21436587\fR.

.Sp

Using \fB\-\-reverse\-bytes=4\fR for the above example, the bytes in the

output file would be ordered \f(CW43218765\fR.

.Sp

By using \fB\-\-reverse\-bytes=2\fR for the above example, followed by

\&\fB\-\-reverse\-bytes=4\fR on the output file, the bytes in the second

output file would be ordered \f(CW34127856\fR.

.IP "\fB\-\-srec\-len=\fR\fIival\fR" 4

.IX Item "--srec-len=ival"

Meaningful only for srec output.  Set the maximum length of the Srecords

being produced to \fIival\fR.  This length covers both address, data and

crc fields.

.IP "\fB\-\-srec\-forceS3\fR" 4

.IX Item "--srec-forceS3"

Meaningful only for srec output.  Avoid generation of S1/S2 records,

creating S3\-only record format.

.IP "\fB\-\-redefine\-sym\fR \fIold\fR\fB=\fR\fInew\fR" 4

.IX Item "--redefine-sym old=new"

Change the name of a symbol \fIold\fR, to \fInew\fR.  This can be useful

when one is trying link two things together for which you have no

source, and there are name collisions.

.IP "\fB\-\-redefine\-syms=\fR\fIfilename\fR" 4

.IX Item "--redefine-syms=filename"

Apply \fB\-\-redefine\-sym\fR to each symbol pair "\fIold\fR \fInew\fR"

listed in the file \fIfilename\fR.  \fIfilename\fR 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.

.IP "\fB\-\-weaken\fR" 4

.IX Item "--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 \fB\-R\fR option to the linker.  This option is only effective when

using an object file format which supports weak symbols.

.IP "\fB\-\-keep\-symbols=\fR\fIfilename\fR" 4

.IX Item "--keep-symbols=filename"

Apply \fB\-\-keep\-symbol\fR option to each symbol listed in the file

\&\fIfilename\fR.  \fIfilename\fR 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.

.IP "\fB\-\-strip\-symbols=\fR\fIfilename\fR" 4

.IX Item "--strip-symbols=filename"

Apply \fB\-\-strip\-symbol\fR option to each symbol listed in the file

\&\fIfilename\fR.  \fIfilename\fR 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.

.IP "\fB\-\-strip\-unneeded\-symbols=\fR\fIfilename\fR" 4

.IX Item "--strip-unneeded-symbols=filename"

Apply \fB\-\-strip\-unneeded\-symbol\fR option to each symbol listed in

the file \fIfilename\fR.  \fIfilename\fR 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.

.IP "\fB\-\-keep\-global\-symbols=\fR\fIfilename\fR" 4

.IX Item "--keep-global-symbols=filename"

Apply \fB\-\-keep\-global\-symbol\fR option to each symbol listed in the

file \fIfilename\fR.  \fIfilename\fR 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.

.IP "\fB\-\-localize\-symbols=\fR\fIfilename\fR" 4

.IX Item "--localize-symbols=filename"

Apply \fB\-\-localize\-symbol\fR option to each symbol listed in the file

\&\fIfilename\fR.  \fIfilename\fR 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.

.IP "\fB\-\-globalize\-symbols=\fR\fIfilename\fR" 4

.IX Item "--globalize-symbols=filename"

Apply \fB\-\-globalize\-symbol\fR option to each symbol listed in the file

\&\fIfilename\fR.  \fIfilename\fR 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.

.IP "\fB\-\-weaken\-symbols=\fR\fIfilename\fR" 4

.IX Item "--weaken-symbols=filename"

Apply \fB\-\-weaken\-symbol\fR option to each symbol listed in the file

\&\fIfilename\fR.  \fIfilename\fR 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.

.IP "\fB\-\-alt\-machine\-code=\fR\fIindex\fR" 4

.IX Item "--alt-machine-code=index"

If the output architecture has alternate machine codes, use the

\&\fIindex\fRth 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 \s-1ELF\s0 based architectures if the \fIindex\fR

alternative does not exist then the value is treated as an absolute

number to be stored in the e_machine field of the \s-1ELF\s0 header.

.IP "\fB\-\-writable\-text\fR" 4

.IX Item "--writable-text"

Mark the output text as writable.  This option isn't meaningful for all

object file formats.

.IP "\fB\-\-readonly\-text\fR" 4

.IX Item "--readonly-text"

Make the output text write protected.  This option isn't meaningful for all

object file formats.

.IP "\fB\-\-pure\fR" 4

.IX Item "--pure"

Mark the output file as demand paged.  This option isn't meaningful for all

object file formats.

.IP "\fB\-\-impure\fR" 4

.IX Item "--impure"

Mark the output file as impure.  This option isn't meaningful for all

object file formats.

.IP "\fB\-\-prefix\-symbols=\fR\fIstring\fR" 4

.IX Item "--prefix-symbols=string"

Prefix all symbols in the output file with \fIstring\fR.

.IP "\fB\-\-prefix\-sections=\fR\fIstring\fR" 4

.IX Item "--prefix-sections=string"

Prefix all section names in the output file with \fIstring\fR.

.IP "\fB\-\-prefix\-alloc\-sections=\fR\fIstring\fR" 4

.IX Item "--prefix-alloc-sections=string"

Prefix all the names of all allocated sections in the output file with

\&\fIstring\fR.

.IP "\fB\-\-add\-gnu\-debuglink=\fR\fIpath-to-file\fR" 4

.IX Item "--add-gnu-debuglink=path-to-file"

Creates a .gnu_debuglink section which contains a reference to \fIpath-to-file\fR

and adds it to the output file.

.IP "\fB\-\-keep\-file\-symbols\fR" 4

.IX Item "--keep-file-symbols"

When stripping a file, perhaps with \fB\-\-strip\-debug\fR or

\&\fB\-\-strip\-unneeded\fR, retain any symbols specifying source file names,

which would otherwise get stripped.

.IP "\fB\-\-only\-keep\-debug\fR" 4

.IX Item "--only-keep-debug"

Strip a file, removing contents of any sections that would not be

stripped by \fB\-\-strip\-debug\fR and leaving the debugging sections

intact.  In \s-1ELF\s0 files, this preserves all note sections in the output.

.Sp

The intention is that this option will be used in conjunction with

\&\fB\-\-add\-gnu\-debuglink\fR to create a two part executable.  One a

stripped binary which will occupy less space in \s-1RAM\s0 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:

.RS 4

.IP "1." 4

.IX Item "1."

\&\f(CW\*(C`foo\*(C'\fR then...

.ie n .IP "1." 4

.el .IP "1." 4

.IX Item "1."

create a file containing the debugging info.

.ie n .IP "1." 4

.el .IP "1." 4

.IX Item "1."

stripped executable.

.ie n .IP "1." 4

.el .IP "1." 4

.IX Item "1."

to add a link to the debugging info into the stripped executable.

.RE

.RS 4

.Sp

Note\-\-\-the choice of \f(CW\*(C`.dbg\*(C'\fR as an extension for the debug info

file is arbitrary.  Also the \f(CW\*(C`\-\-only\-keep\-debug\*(C'\fR step is

optional.  You could instead do this:

.IP "1." 4

.IX Item "1."

.PD 0

.ie n .IP "1." 4

.el .IP "1." 4

.IX Item "1."

.ie n .IP "1." 4

.el .IP "1." 4

.IX Item "1."

.ie n .IP "1." 4

.el .IP "1." 4

.IX Item "1."

.RE

.RS 4

.PD

.Sp

i.e., the file pointed to by the \fB\-\-add\-gnu\-debuglink\fR can be the

full executable.  It does not have to be a file created by the

\&\fB\-\-only\-keep\-debug\fR switch.

.Sp

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.

.RE

.IP "\fB\-\-file\-alignment\fR \fInum\fR" 4

.IX Item "--file-alignment num"

Specify the file alignment.  Sections in the file will always begin at

file offsets which are multiples of this number.  This defaults to

512.

[This option is specific to \s-1PE\s0 targets.]

.IP "\fB\-\-heap\fR \fIreserve\fR" 4

.IX Item "--heap reserve"

.PD 0

.IP "\fB\-\-heap\fR \fIreserve\fR\fB,\fR\fIcommit\fR" 4

.IX Item "--heap reserve,commit"

.PD

Specify the number of bytes of memory to reserve (and optionally commit)

to be used as heap for this program.

[This option is specific to \s-1PE\s0 targets.]

.IP "\fB\-\-image\-base\fR \fIvalue\fR" 4

.IX Item "--image-base value"

Use \fIvalue\fR as the base address of your program or dll.  This is

the lowest memory location that will be used when your program or dll

is loaded.  To reduce the need to relocate and improve performance 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 \s-1PE\s0 targets.]

.IP "\fB\-\-section\-alignment\fR \fInum\fR" 4

.IX Item "--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 \s-1PE\s0 targets.]

.IP "\fB\-\-stack\fR \fIreserve\fR" 4

.IX Item "--stack reserve"

.PD 0

.IP "\fB\-\-stack\fR \fIreserve\fR\fB,\fR\fIcommit\fR" 4

.IX Item "--stack reserve,commit"

.PD

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 \s-1PE\s0 targets.]

.IP "\fB\-\-subsystem\fR \fIwhich\fR" 4

.IX Item "--subsystem which"

.PD 0

.IP "\fB\-\-subsystem\fR \fIwhich\fR\fB:\fR\fImajor\fR" 4

.IX Item "--subsystem which:major"

.IP "\fB\-\-subsystem\fR \fIwhich\fR\fB:\fR\fImajor\fR\fB.\fR\fIminor\fR" 4

.IX Item "--subsystem which:major.minor"

.PD

Specifies the subsystem under which your program will execute.  The

legal values for \fIwhich\fR are \f(CW\*(C`native\*(C'\fR, \f(CW\*(C`windows\*(C'\fR,

\&\f(CW\*(C`console\*(C'\fR, \f(CW\*(C`posix\*(C'\fR, \f(CW\*(C`efi\-app\*(C'\fR, \f(CW\*(C`efi\-bsd\*(C'\fR,

\&\f(CW\*(C`efi\-rtd\*(C'\fR, \f(CW\*(C`sal\-rtd\*(C'\fR, and \f(CW\*(C`xbox\*(C'\fR.  You may optionally set

the subsystem version also.  Numeric values are also accepted for

\&\fIwhich\fR.

[This option is specific to \s-1PE\s0 targets.]

.IP "\fB\-\-extract\-symbol\fR" 4

.IX Item "--extract-symbol"

Keep the file's section flags and symbols but remove all section data.

Specifically, the option:

.RS 4

.IP "*" 4

.IX Item "*"

.PD 0

.IP "*" 4

.IX Item "*"

.IP "*" 4

.IX Item "*"

.RE

.RS 4

.PD

.Sp

This option is used to build a \fI.sym\fR file for a VxWorks kernel.

It can also be a useful way of reducing the size of a \fB\-\-just\-symbols\fR

linker input file.

.RE

.IP "\fB\-V\fR" 4

.IX Item "-V"

.PD 0

.IP "\fB\-\-version\fR" 4

.IX Item "--version"

.PD

Show the version number of \fBobjcopy\fR.

.IP "\fB\-v\fR" 4

.IX Item "-v"

.PD 0

.IP "\fB\-\-verbose\fR" 4

.IX Item "--verbose"

.PD

Verbose output: list all object files modified.  In the case of

archives, \fBobjcopy \-V\fR lists all members of the archive.

.IP "\fB\-\-help\fR" 4

.IX Item "--help"

Show a summary of the options to \fBobjcopy\fR.

.IP "\fB\-\-info\fR" 4

.IX Item "--info"

Display a list showing all architectures and object formats available.

.IP "\fB@\fR\fIfile\fR" 4

.IX Item "@file"

Read command-line options from \fIfile\fR.  The options read are

inserted in place of the original @\fIfile\fR option.  If \fIfile\fR

does not exist, or cannot be read, then the option will be treated

literally, and not removed.

.Sp

Options in \fIfile\fR are separated by whitespace.  A whitespace

character may be included in an option by surrounding the entire

option in either single or double quotes.  Any character (including a

backslash) may be included by prefixing the character to be included

with a backslash.  The \fIfile\fR may itself contain additional

@\fIfile\fR options; any such options will be processed recursively.

.SH "SEE ALSO"

.IX Header "SEE ALSO"

\&\fIld\fR\|(1), \fIobjdump\fR\|(1), and the Info entries for \fIbinutils\fR.

.SH "COPYRIGHT"

.IX Header "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.

.PP

Permission is granted to copy, distribute and/or modify this document

under the terms of the \s-1GNU\s0 Free Documentation License, Version 1.3

or any later version published by the Free Software Foundation;