aadwc.c

早期freebsd实现

/*-
 * Copyright (c) 1986 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Computer Consoles Inc.
 *
 * 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 the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *	@(#)Aadwc.c	7.1 (Berkeley) 12/6/90
 */

#include "align.h" 
adwc(infop)	process_info *infop;
/*
/*	Add with carry.
/*	Note : the play with 'tmp' just before the 'asm' line makes
/*		sure that when the adwc opcode is executed, the current
/*		carry in psl is the same as the 'offending' process'.
/*		Don't change unless you know exactly what you're doing.
/*
/*****************************/
{
	register	long	Register_12;	/* Has to be first reg ! */
	register	long	Register_11;
	register	long	Register_10;
	register 	long	tmp;

	Register_12 = operand(infop,0)->data;
	Register_11 = operand(infop,1)->data;
	if (carry)	/* If process' carry set */
		tmp = -1;
	else tmp = 0;
	tmp++;		/* 0 => carry set.  1 => carry clear */

	Register_10=psl;
	Set_psl(r10);	/* restore the user psl */
	asm("	adwc	r11,r12");
	asm("	movpsl	r11");
	New_cc (Register_11);

	write_back(infop, Register_12, operand(infop,1) );
}