10Sstevel@tonic-gate/* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 56812Sraf * Common Development and Distribution License (the "License"). 66812Sraf * You may not use this file except in compliance with the License. 70Sstevel@tonic-gate * 80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 100Sstevel@tonic-gate * See the License for the specific language governing permissions 110Sstevel@tonic-gate * and limitations under the License. 120Sstevel@tonic-gate * 130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 180Sstevel@tonic-gate * 190Sstevel@tonic-gate * CDDL HEADER END 200Sstevel@tonic-gate */ 216812Sraf 226812Sraf/* 236812Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 246812Sraf * Use is subject to license terms. 256812Sraf */ 266812Sraf 270Sstevel@tonic-gate/* Copyright (c) 1988 AT&T */ 280Sstevel@tonic-gate/* All Rights Reserved */ 290Sstevel@tonic-gate 30*7298SMark.J.Nelson@Sun.COM .file "lsub.s" 310Sstevel@tonic-gate 320Sstevel@tonic-gate/* 330Sstevel@tonic-gate * Double long subtraction routine. Ported from pdp 11/70 version 340Sstevel@tonic-gate * with considerable effort. All supplied comments were ported. 350Sstevel@tonic-gate * Ported from m32 version to sparc. No comments about difficulty. 360Sstevel@tonic-gate * 370Sstevel@tonic-gate * dl_t 380Sstevel@tonic-gate * lsub (lop, rop) 390Sstevel@tonic-gate * dl_t lop; 400Sstevel@tonic-gate * dl_t rop; 410Sstevel@tonic-gate */ 420Sstevel@tonic-gate 436812Sraf#include "SYS.h" 440Sstevel@tonic-gate 450Sstevel@tonic-gate ENTRY(lsub) 460Sstevel@tonic-gate 470Sstevel@tonic-gate ld [%o7+8],%o4 ! Instruction at ret-addr should be a 480Sstevel@tonic-gate cmp %o4,8 ! 'unimp 8' indicating a valid call. 490Sstevel@tonic-gate be 1f ! if OK, go forward. 500Sstevel@tonic-gate nop ! delay instruction. 510Sstevel@tonic-gate jmp %o7+8 ! return 520Sstevel@tonic-gate nop ! delay instruction. 530Sstevel@tonic-gate 540Sstevel@tonic-gate1: 550Sstevel@tonic-gate ld [%o0+0],%o2 ! fetch lop.dl_hop 560Sstevel@tonic-gate ld [%o0+4],%o3 ! fetch lop.dl_lop 570Sstevel@tonic-gate ld [%o1+0],%o4 ! fetch rop.dl_hop 580Sstevel@tonic-gate ld [%o1+4],%o5 ! fetch rop.dl_lop 590Sstevel@tonic-gate subcc %o3,%o5,%o3 ! lop.dl_lop - rop.dl_lop (set carry) 600Sstevel@tonic-gate subxcc %o2,%o4,%o2 ! lop.dl_hop - rop.dl_hop - <carry> 610Sstevel@tonic-gate ld [%sp+(16*4)],%o0 ! address to store result into 620Sstevel@tonic-gate st %o2,[%o0] ! store result.dl_hop 630Sstevel@tonic-gate jmp %o7+12 ! return 640Sstevel@tonic-gate st %o3,[%o0+4] ! store result.dl_lop 650Sstevel@tonic-gate 660Sstevel@tonic-gate SET_SIZE(lsub) 67