ladd.s revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
/* Copyright (c) 1989 by Sun Microsystems, Inc. */
.ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.1 */
/*
* Double long add routine. Ported from pdp 11/70 version
* with considerable effort. All supplied comments were ported.
*
* Ported from m32 version to sparc. No comments about difficulty.
*
* dl_t
* ladd (lop, rop)
* dl_t lop;
* dl_t rop;
*/
.file "ladd.s"
#include <sys/asm_linkage.h>
ANSI_PRAGMA_WEAK(ladd,function)
#include "synonyms.h"
ENTRY(ladd)
ld [%o7+8],%o4 ! Instruction at ret-addr should be a
cmp %o4,8 ! 'unimp 8' indicating a valid call.
be 1f ! if OK, go forward.
nop ! delay instruction.
jmp %o7+8 ! return
nop ! delay instruction.
1:
ld [%o0+0],%o2 ! fetch lop.dl_hop
ld [%o0+4],%o3 ! fetch lop.dl_lop
ld [%o1+0],%o4 ! fetch rop.dl_hop
ld [%o1+4],%o5 ! fetch rop.dl_lop
addcc %o3,%o5,%o3 ! lop.dl_lop + rop.dl_lop (set carry)
addxcc %o2,%o4,%o2 ! lop.dl_hop + rop.dl_hop + <carry>
ld [%sp+(16*4)],%o0 ! address to store result into
st %o2,[%o0+0] ! store result, dl_hop
jmp %o7+12 ! return
st %o3,[%o0+4] ! store result, dl_lop
SET_SIZE(ladd)