293 lines
11 KiB
Groff
293 lines
11 KiB
Groff
.\" Copyright (c) 1991, 93, 94, 95, 96, 1997 Free Software Foundation
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.\" See section COPYING for conditions for redistribution
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.TH objcopy 1 "October 1994" "cygnus support" "GNU Development Tools"
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.de BP
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.sp
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.ti \-.2i
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\(**
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..
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.SH NAME
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objcopy \- copy and translate object files
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.SH SYNOPSIS
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.hy 0
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.na
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.TP
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.B objcopy
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.RB "[\|" \-F\ \fIbfdname\fR\ |\ \fB\-\-target=\fIbfdname\fR "\|]"
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.RB "[\|" \-I\ \fIbfdname\fR\ |\ \fB\-\-input\-target=\fIbfdname\fR "\|]"
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.RB "[\|" \-O\ \fIbfdname\fR\ |\ \fB\-\-output\-target=\fIbfdname\fR "\|]"
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.RB "[\|" \-R\ \fIsectionname\fR\ |\ \fB\-\-remove\-section=\fIsectionname\fR "\|]"
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.RB "[\|" \-S\fR\ |\ \fB\-\-strip\-all\fR "\|]"
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.RB "[\|" \-g\fR\ |\ \fB\-\-strip\-debug\fR "\|]"
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.RB "[\|" \-\-strip\-unneeded\fR "\|]"
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.RB "[\|" \-K\ \fIsymbolname\fR\ |\ \fB\-\-keep\-symbol=\fIsymbolname\fR "\|]"
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.RB "[\|" \-N\ \fIsymbolname\fR\ |\ \fB\-\-strip\-symbol=\fIsymbolname\fR "\|]"
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.RB "[\|" \-x\fR\ |\ \fB\-\-discard\-all\fR "\|]"
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.RB "[\|" \-X\fR\ |\ \fB\-\-discard\-locals\fR "\|]"
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.RB "[\|" \-b\ \fIbyte\fR\ |\ \fB\-\-byte=\fIbyte\fR "\|]"
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.RB "[\|" \-i\ \fIinterleave\fR\ |\ \fB\-\-interleave=\fIinterleave\fR "\|]"
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.RB "[\|" \-p\fR\ |\ \fB\-\-preserve\-dates\fR "\|]"
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.RB "[\|" \-\-debugging "\|]"
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.RB "[\|" \-\-gap\-fill=\fIval\fR "\|]"
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.RB "[\|" \-\-pad\-to=\fIaddress\fR "\|]"
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.RB "[\|" \-\-set\-start=\fIval\fR "\|]"
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.RB "[\|" \-\-adjust\-start=\fIincr\fR "\|]"
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.RB "[\|" \-\-adjust\-vma=\fIincr\fR "\|]"
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.RB "[\|" \-\-adjust\-section\-vma=\fIsection{=,+,-}val\fR "\|]"
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.RB "[\|" \-\-adjust\-warnings\fR "\|]"
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.RB "[\|" \-\-no\-adjust\-warnings\fR "\|]"
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.RB "[\|" \-\-set\-section\-flags=\fIsection=flags\fR "\|]"
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.RB "[\|" \-\-add\-section=\fIsectionname=filename\fR "\|]"
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.RB "[\|" \-\-change\-leading\-char\fR "\|]"
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.RB "[\|" \-\-remove\-leading\-char\fR "\|]"
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.RB "[\|" \-\-weaken\fR "\|]"
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.RB "[\|" \-v\ |\ \-\-verbose\fR "\|]"
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.RB "[\|" \-V\ |\ \-\-version\fR "\|]"
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.RB "[\|" \-\-help\fR "\|]"
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.B infile
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.RB "[\|" outfile\fR "\|]"
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.SH DESCRIPTION
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The GNU
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.B objcopy
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utility copies the contents of an object file to another.
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.B objcopy
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uses the GNU BFD Library to read and write the object files. It can
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write the destination object file in a format different from that of
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the source object file. The exact behavior of
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.B objcopy
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is controlled by command-line options.
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.PP
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.B objcopy
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creates temporary files to do its translations and deletes them
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afterward.
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.B objcopy
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uses BFD to do all its translation work; it knows about all the
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formats BFD knows about, and thus is able to recognize most formats
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without being told explicitly.
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.PP
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.B objcopy
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can be used to generate S-records by using an output target of
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.B srec
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(e.g., use
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.B -O srec).
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.PP
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.B objcopy
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can be used to generate a raw binary file by using an output target of
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.B binary
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(e.g., use
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.B -O binary).
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When
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.B objcopy
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generates a raw binary file, it will essentially produce a memory dump
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of the contents of the input object file. All symbols and relocation
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information will be discarded. The memory dump will start at the
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virtual address of the lowest section copied into the output file.
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.PP
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When generating an S-record or a raw binary file, it may be helpful to
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use
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.B -S
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to remove sections containing debugging information. In some cases
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.B -R
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will be useful to remove sections which contain information which is
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not needed by the binary file.
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.PP
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.I infile
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and
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.I outfile
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are the source and output files respectively. If you do not specify
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.IR outfile ,
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.B objcopy
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creates a temporary file and destructively renames the result with the
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name of the input file.
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.SH OPTIONS
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.TP
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.B \-I \fIbfdname\fR, \fB\-\-input\-target=\fIbfdname
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Consider the source file's object format to be
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.IR bfdname ,
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rather than attempting to deduce it.
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.TP
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.B \-O \fIbfdname\fR, \fB\-\-output\-target=\fIbfdname
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Write the output file using the object format
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.IR bfdname .
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.TP
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.B \-F \fIbfdname\fR, \fB\-\-target=\fIbfdname
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Use
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.I bfdname
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as the object format for both the input and the output file; i.e.
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simply transfer data from source to destination with no translation.
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.TP
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.B \-R \fIsectionname\fR, \fB\-\-remove-section=\fIsectionname
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Remove the named section from the file. This option may be given more
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than once. Note that using this option inappropriately may make the
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output file unusable.
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.TP
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.B \-S\fR, \fB\-\-strip\-all
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Do not copy relocation and symbol information from the source file.
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.TP
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.B \-g\fR, \fB\-\-strip\-debug
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Do not copy debugging symbols from the source file.
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.TP
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.B \-\-strip\-unneeded
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Strip all symbols that are not needed for relocation processing.
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.TP
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.B \-K \fIsymbolname\fR, \fB\-\-keep\-symbol=\fIsymbolname
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Copy only symbol \fIsymbolname\fP from the source file. This option
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may be given more than once.
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.TP
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.B \-N \fIsymbolname\fR, \fB\-\-strip\-symbol=\fIsymbolname
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Do not copy symbol \fIsymbolname\fP from the source file. This option
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may be given more than once, and may be combined with strip options
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other than \fB\-K\fR.
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.TP
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.B \-x\fR, \fB \-\-discard\-all
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Do not copy non-global symbols from the source file.
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.TP
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.B \-X\fR, \fB\-\-discard\-locals
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Do not copy compiler-generated local symbols. (These usually start
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with "L" or ".").
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.TP
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.B \-b \fIbyte\fR, \fB\-\-byte=\fIbyte
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Keep only every \fIbyte\fPth byte of the input file (header data is
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not affected). \fIbyte\fP can be in the range from 0 to the
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interleave-1. This option is useful for creating files to program
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ROMs. It is typically used with an srec output target.
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.TP
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.B \-i \fIinterleave\fR, \fB\-\-interleave=\fIinterleave
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Only copy one out of every \fIinterleave\fP bytes. Which one to copy is
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selected by the \fB\-b\fP or \fB\-\-byte\fP option. The default is 4.
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The interleave is ignored if neither \fB\-b\fP nor \fB\-\-byte\fP is given.
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.TP
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.B \-p\fR, \fB\-\-preserve\-dates
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Set the access and modification dates of the output file to be the same
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as those of the input file.
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.TP
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.B \-\-debugging
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Convert debugging information, if possible. This is not the default
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because only certain debugging formats are supported, and the
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conversion process can be time consuming.
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.TP
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.B \-\-gap\-fill=\fIval
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Fill gaps between sections with \fIval\fP. This is done by increasing
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the size of the section with the lower address, and filling in the extra
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space created with \fIval\fP.
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.TP
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.B \-\-pad\-to=\fIaddress
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Pad the output file up to the virtual address \fIaddress\fP. This is
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done by increasing the size of the last section. The extra space is
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filled in with the value specified by \fB\-\-gap\-fill\fP (default
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zero).
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.TP
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.B \fB\-\-set\-start=\fIval
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Set the start address of the new file to \fIval\fP. Not all object
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file formats support setting the start address.
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.TP
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.B \fB\-\-adjust\-start=\fIincr
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Adjust the start address by adding \fIincr\fP. Not all object file
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formats support setting the start address.
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.TP
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.B \fB\-\-adjust\-vma=\fIincr
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Adjust the address of all sections, as well as the start address, by
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adding \fIincr\fP. Some object file formats do not permit section
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addresses to be changed arbitrarily. Note that this does not relocate
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the sections; if the program expects sections to be loaded at a
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certain address, and this option is used to change the sections such
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that they are loaded at a different address, the program may fail.
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.TP
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.B \fB\-\-adjust\-section\-vma=\fIsection{=,+,-}val
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Set or adjust the address of the named \fIsection\fP. If \fI=\fP is
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used, the section address is set to \fIval\fP. Otherwise, \fIval\fP
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is added to or subtracted from the section address. See the comments
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under \fB\-\-adjust\-vma\fP, above. If \fIsection\fP does not exist
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in the input file, a warning will be issued, unless
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\fB\-\-no\-adjust\-warnings\fP is used.
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.TP
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.B \fB\-\-adjust\-warnings
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If \fB\-\-adjust\-section\-vma\fP is used, and the named section does
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not exist, issue a warning. This is the default.
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.TP
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.B \fB\-\-no\-adjust\-warnings
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Do not issue a warning if \fB\-\-adjust\-section\-vma\fP is used, even
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if the named section does not exist.
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.TP
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.B \fB\-\-set\-section\-flags=\fIsection=flags
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Set the flags for the named section. The \fIflags\fP argument is a
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comma separated string of flag names. The recognized names are
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\fIalloc\fP, \fIload\fP, \fIreadonly\fP, \fIcode\fP, \fIdata\fP, and
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\fIrom\fP. Not all flags are meaningful for all object file
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formats.
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.TP
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.B \fB\-\-add\-section=\fIsectionname=filename
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Add a new section named \fIsectionname\fR while copying the file. The
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contents of the new section are taken from the file \fIfilename\fR.
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The size of the section will be the size of the file. This option
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only works on file formats which can support sections with arbitrary
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names.
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.TP
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.B \-\-change\-leading\-char
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Some object file formats use special characters at the start of
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symbols. The most common such character is underscore, which compilers
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often add before every symbol. This option tells
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.B objcopy
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to change the leading character of every symbol when it converts
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between object file formats. If the object file formats use the same
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leading character, this option has no effect. Otherwise, it will add
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a character, or remove a character, or change a character, as
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appropriate.
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.TP
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.B \-\-remove\-leading\-char
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If the first character of a global symbol is a special symbol leading
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character used by the object file format, remove the character. The
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most common symbol leading character is underscore. This option will
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remove a leading underscore from all global symbols. This can be
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useful if you want to link together objects of different file formats
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with different conventions for symbol names. This is different from
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@code{--change-leading-char} because it always changes the symbol name
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when appropriate, regardless of the object file format of the output
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.TP
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.B \-\-weaken
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Change all global symbols in the file to be weak.
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.TP
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.B \-v\fR, \fB\-\-verbose
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Verbose output: list all object files modified. In the case of
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archives, "\fBobjcopy \-V\fR" lists all members of the archive.
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.TP
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.B \-V\fR, \fB\-\-version
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Show the version number of
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.B objcopy
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and exit.
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.TP
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.B \-\-help
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Show a summary of the options to
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.B objcopy
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and exit.
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.SH "SEE ALSO"
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.RB "`\|" binutils "\|'"
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entry in
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.B
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info\c
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\&;
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.I
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The GNU Binary Utilities\c
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\&, Roland H. Pesch (June 1993).
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.SH COPYING
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Copyright (c) 1993, 94, 95, 96, 1997 Free Software Foundation, Inc.
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.PP
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Permission is granted to make and distribute verbatim copies of
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this manual provided the copyright notice and this permission notice
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are preserved on all copies.
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.PP
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Permission is granted to copy and distribute modified versions of this
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manual under the conditions for verbatim copying, provided that the
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entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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.PP
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Permission is granted to copy and distribute translations of this
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manual into another language, under the above conditions for modified
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versions, except that this permission notice may be included in
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translations approved by the Free Software Foundation instead of in
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the original English.
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