1*5d9d9091SRichard Lowe/* 2*5d9d9091SRichard Lowe * CDDL HEADER START 3*5d9d9091SRichard Lowe * 4*5d9d9091SRichard Lowe * The contents of this file are subject to the terms of the 5*5d9d9091SRichard Lowe * Common Development and Distribution License (the "License"). 6*5d9d9091SRichard Lowe * You may not use this file except in compliance with the License. 7*5d9d9091SRichard Lowe * 8*5d9d9091SRichard Lowe * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*5d9d9091SRichard Lowe * or http://www.opensolaris.org/os/licensing. 10*5d9d9091SRichard Lowe * See the License for the specific language governing permissions 11*5d9d9091SRichard Lowe * and limitations under the License. 12*5d9d9091SRichard Lowe * 13*5d9d9091SRichard Lowe * When distributing Covered Code, include this CDDL HEADER in each 14*5d9d9091SRichard Lowe * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*5d9d9091SRichard Lowe * If applicable, add the following below this CDDL HEADER, with the 16*5d9d9091SRichard Lowe * fields enclosed by brackets "[]" replaced with your own identifying 17*5d9d9091SRichard Lowe * information: Portions Copyright [yyyy] [name of copyright owner] 18*5d9d9091SRichard Lowe * 19*5d9d9091SRichard Lowe * CDDL HEADER END 20*5d9d9091SRichard Lowe */ 21*5d9d9091SRichard Lowe 22*5d9d9091SRichard Lowe/* 23*5d9d9091SRichard Lowe * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24*5d9d9091SRichard Lowe * Use is subject to license terms. 25*5d9d9091SRichard Lowe */ 26*5d9d9091SRichard Lowe 27*5d9d9091SRichard Lowe/* Copyright (c) 1988 AT&T */ 28*5d9d9091SRichard Lowe/* All Rights Reserved */ 29*5d9d9091SRichard Lowe 30*5d9d9091SRichard Lowe .file "lsub.s" 31*5d9d9091SRichard Lowe 32*5d9d9091SRichard Lowe/* 33*5d9d9091SRichard Lowe * Double long subtraction routine. Ported from pdp 11/70 version 34*5d9d9091SRichard Lowe * with considerable effort. All supplied comments were ported. 35*5d9d9091SRichard Lowe * Ported from m32 version to sparc. No comments about difficulty. 36*5d9d9091SRichard Lowe * 37*5d9d9091SRichard Lowe * dl_t 38*5d9d9091SRichard Lowe * lsub (lop, rop) 39*5d9d9091SRichard Lowe * dl_t lop; 40*5d9d9091SRichard Lowe * dl_t rop; 41*5d9d9091SRichard Lowe */ 42*5d9d9091SRichard Lowe 43*5d9d9091SRichard Lowe#include "SYS.h" 44*5d9d9091SRichard Lowe 45*5d9d9091SRichard Lowe ENTRY(lsub) 46*5d9d9091SRichard Lowe 47*5d9d9091SRichard Lowe ld [%o7+8],%o4 ! Instruction at ret-addr should be a 48*5d9d9091SRichard Lowe cmp %o4,8 ! 'unimp 8' indicating a valid call. 49*5d9d9091SRichard Lowe be 1f ! if OK, go forward. 50*5d9d9091SRichard Lowe nop ! delay instruction. 51*5d9d9091SRichard Lowe jmp %o7+8 ! return 52*5d9d9091SRichard Lowe nop ! delay instruction. 53*5d9d9091SRichard Lowe 54*5d9d9091SRichard Lowe1: 55*5d9d9091SRichard Lowe ld [%o0+0],%o2 ! fetch lop.dl_hop 56*5d9d9091SRichard Lowe ld [%o0+4],%o3 ! fetch lop.dl_lop 57*5d9d9091SRichard Lowe ld [%o1+0],%o4 ! fetch rop.dl_hop 58*5d9d9091SRichard Lowe ld [%o1+4],%o5 ! fetch rop.dl_lop 59*5d9d9091SRichard Lowe subcc %o3,%o5,%o3 ! lop.dl_lop - rop.dl_lop (set carry) 60*5d9d9091SRichard Lowe subxcc %o2,%o4,%o2 ! lop.dl_hop - rop.dl_hop - <carry> 61*5d9d9091SRichard Lowe ld [%sp+(16*4)],%o0 ! address to store result into 62*5d9d9091SRichard Lowe st %o2,[%o0] ! store result.dl_hop 63*5d9d9091SRichard Lowe jmp %o7+12 ! return 64*5d9d9091SRichard Lowe st %o3,[%o0+4] ! store result.dl_lop 65*5d9d9091SRichard Lowe 66*5d9d9091SRichard Lowe SET_SIZE(lsub) 67