2005-06-05 23:00:02 +04:00
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.\" $NetBSD: genassym.1,v 1.2 2005/06/05 19:00:02 wiz Exp $
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2005-05-31 15:35:54 +04:00
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.\"
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.\" Copyright (c) 1997 Matthias Pfaller.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Matthias Pfaller.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 31, 2005
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2005-06-05 23:00:02 +04:00
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.Dt GENASSYM 1
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2005-05-31 15:35:54 +04:00
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.Os
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.Sh NAME
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.Nm genassym
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.Nd emit an assym.h file
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.Sh SYNOPSIS
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.Nm genassym
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.Op Fl c
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.Op Fl f
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.Ar C compiler invocation
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.Sh DESCRIPTION
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.Nm
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is a shell script normally used during the kernel build process to
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create an assym.h file.
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This file defines a number of cpp constants derived from the configuration
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information
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.Nm
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reads from stdin. The generated file is used by kernel sources
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written in assembler to gain access to information (e.g. structure
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offsets and sizes) normally only known to the C compiler.
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Arguments to
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.Nm
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are usually of the form
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.Ar ${CC} ${CFLAGS} ${CPPFLAGS}
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where
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.Ar ${CC}
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is the C compiler used to compile the kernel, while
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.Ar ${CFLAGS}
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and
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.Ar ${CPPFLAGS}
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are flag arguments to the C compiler. The script creates a C source file
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from its input. Then the C compiler is called according to the script's
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arguments to compile this file. Normally
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.Nm
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instructs the C compiler to create an assembler source from the constructed
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C source. The resulting file is then processed to extract the information
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needed to create the assym.h file. The
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.Fl c
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flag instructs
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.Nm
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to create slightly different code, generate an executable from this code
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and run it. In both cases the assym.h file is written to stdout.
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The
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.Fl f
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flag instructs
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.Nm
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to create forth code.
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.Sh DIAGNOSTICS
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Either self-explanatory, or generated by one of the programs
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called from the script.
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.Sh SEE ALSO
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.Xr genassym.cf 5
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Nx 1.3
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as genassym.sh in
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.Pa /sys/kern .
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It became a userland utility in
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.Nx 4.0 .
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