.\" $OpenBSD: genassym.cf.5,v 1.7 2004/02/01 13:47:10 jmc Exp $ .\" $NetBSD: genassym.cf.5,v 1.8 2001/06/19 12:34:27 wiz Exp $ .\" .\" Copyright (c) 1997 Matthias Pfaller. .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by Matthias Pfaller. .\" 4. The name of the author may not be used to endorse or promote products .\" derived from this software without specific prior written permission .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. .\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd April 25, 1998 .Dt GENASSYM.CF 5 .Os .Sh NAME .Nm genassym.cf .Nd assym.h definition file .Sh DESCRIPTION The .Nm file is used by .Xr genassym.sh 8 to make constant C expressions known to assembler source files. .Pp Lines starting with '#' are discarded by .Xr genassym.sh 8 . Lines starting with .Em include , .Em ifdef , .Em if , .Em else or .Em endif are preceded with '#' and passed otherwise unmodified to the C compiler. .Pp Lines starting with .Em quote get passed on with the .Em quote command removed. .Pp The first word after a .Em define command is taken as a CPP identifier and the rest of the line has to be a constant C expression. The output of .Xr genassym.sh 8 will assign the numerical value of this expression to the CPP identifier. .Pp .Em "export foo" .br is a shorthand for .br .Em "define foo foo" . .Pp .Em "struct foo" .br remembers foo for the .Em member command and does a .br .Em "define FOO_SIZEOF sizeof(foo)" , .br with the structure name converted to upper case. .Pp .Em "member foo" .br does a .br .Em "define FOO offsetof(, foo)" . .br The two argument form of .Em "member" , as .br .Em "member foo bar" .br does a .br .Em "define FOO offsetof(, bar)" , .br with its first argument converted to upper case. In the case where struct was invoked with an extra argument, as in .br .Em "struct foo PREFIX_" , .br the first argument of member will be prefixed by the remembered prefix, before being converted to upper case. .Pp .Em "union foo" .br is similar to the .Em struct command, but applies to a union instead of a struct. .Pp .Em "config " .br can be used to customize the output of .Xr genassym.sh 8 . .br When producing C output, values are cast to (default: long) before they get handed to printf. (default: n) is the constraint used in the __asm__ statements. (default: empty) can be used to force gcc to output operands in different ways than normal. The "a" modifier e.g. stops gcc from emitting immediate prefixes in front of constants for the i386 and m68k port. .Sh FILES .Pa /sys/arch/${MACHINE}/${MACHINE}/genassym.cf .Sh SEE ALSO .Xr genassym.sh 8 .Sh HISTORY The first use of .Nm files occurred in .Ox 2.2 . Its use was generalized to all ports for .Ox 3.0 . The .Em union command appeared in .Ox 3.5 .