93 lines
3.4 KiB
Groff
93 lines
3.4 KiB
Groff
.\" $NetBSD: genassym.cf.5,v 1.11 2005/09/11 23:32:48 wiz Exp $
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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 August 18, 2005
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.Dt GENASSYM.CF 5
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.Os
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.Sh NAME
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.Nm genassym.cf
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.Nd assym.h definition file
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.Sh DESCRIPTION
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The
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.Nm
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file is used by
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.Xr genassym 1
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to make constant C expressions known to assembler source files.
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Lines starting with '#' are discarded by
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.Xr genassym 1 .
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Lines starting with
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.Em include ,
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.Em ifdef ,
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.Em if ,
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.Em else
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or
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.Em endif
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are preceded with '#' and passed otherwise unmodified to the C compiler.
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Lines starting with
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.Em quote
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get passed on with the
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.Em quote
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command removed.
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The first word after a
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.Em define
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command is taken as a CPP identifier and the rest of the line has to be
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a constant C expression. The output of
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.Xr genassym 1
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will assign the numerical value of this expression to the CPP identifier.
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.Em "export X"
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is a shorthand for
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.Em "define X X" .
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.Em "struct X"
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remembers X for the
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.Em member
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command and does a
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.Em "define X_SIZEOF sizeof(X)" .
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.Em "member X"
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does a
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.Em "define X offsetof(\*[Lt]last struct\*[Gt], X)" .
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.Em "config \*[Lt]ctype\*[Gt] \*[Lt]gcc constraint\*[Gt] \*[Lt]asm print modifier\*[Gt]"
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can be used to customize the output of
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.Xr genassym 1 .
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When producing C output, values are casted to \*[Lt]ctype\*[Gt] (default: long)
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before they get handed to printf. \*[Lt]gcc constraint\*[Gt] (default: n) is the
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constraint used in the __asm__ statements. \*[Lt]asm print modifier\*[Gt] (default:
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empty) can be used to force gcc to output operands in different ways
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then normal. The "a" modifier e.g. stops gcc from emitting immediate
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prefixes in front of constants for the i386 and m68k port.
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.Sh FILES
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.Pa /usr/src/sys/arch/${MACHINE}/${MACHINE}/genassym.cf
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.Sh SEE ALSO
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.Xr genassym 1
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.Sh HISTORY
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The
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.Nm
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file appeared in
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.Nx 1.3 .
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