17c478bd9Sstevel@tonic-gate/* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 57257d1b4Sraf * Common Development and Distribution License (the "License"). 67257d1b4Sraf * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 217257d1b4Sraf 227257d1b4Sraf/* 237257d1b4Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 247257d1b4Sraf * Use is subject to license terms. 257257d1b4Sraf */ 267257d1b4Sraf 277c478bd9Sstevel@tonic-gate/* Copyright (c) 1988 AT&T */ 287c478bd9Sstevel@tonic-gate/* All Rights Reserved */ 297c478bd9Sstevel@tonic-gate 30*9a70fc3bSMark J. Nelson .file "lsub.s" 317c478bd9Sstevel@tonic-gate 327c478bd9Sstevel@tonic-gate/* 337c478bd9Sstevel@tonic-gate * Double long subtraction routine. Ported from pdp 11/70 version 347c478bd9Sstevel@tonic-gate * with considerable effort. All supplied comments were ported. 357c478bd9Sstevel@tonic-gate * Ported from m32 version to sparc. No comments about difficulty. 367c478bd9Sstevel@tonic-gate * 377c478bd9Sstevel@tonic-gate * dl_t 387c478bd9Sstevel@tonic-gate * lsub (lop, rop) 397c478bd9Sstevel@tonic-gate * dl_t lop; 407c478bd9Sstevel@tonic-gate * dl_t rop; 417c478bd9Sstevel@tonic-gate */ 427c478bd9Sstevel@tonic-gate 437257d1b4Sraf#include "SYS.h" 447c478bd9Sstevel@tonic-gate 457c478bd9Sstevel@tonic-gate ENTRY(lsub) 467c478bd9Sstevel@tonic-gate 477c478bd9Sstevel@tonic-gate ld [%o7+8],%o4 ! Instruction at ret-addr should be a 487c478bd9Sstevel@tonic-gate cmp %o4,8 ! 'unimp 8' indicating a valid call. 497c478bd9Sstevel@tonic-gate be 1f ! if OK, go forward. 507c478bd9Sstevel@tonic-gate nop ! delay instruction. 517c478bd9Sstevel@tonic-gate jmp %o7+8 ! return 527c478bd9Sstevel@tonic-gate nop ! delay instruction. 537c478bd9Sstevel@tonic-gate 547c478bd9Sstevel@tonic-gate1: 557c478bd9Sstevel@tonic-gate ld [%o0+0],%o2 ! fetch lop.dl_hop 567c478bd9Sstevel@tonic-gate ld [%o0+4],%o3 ! fetch lop.dl_lop 577c478bd9Sstevel@tonic-gate ld [%o1+0],%o4 ! fetch rop.dl_hop 587c478bd9Sstevel@tonic-gate ld [%o1+4],%o5 ! fetch rop.dl_lop 597c478bd9Sstevel@tonic-gate subcc %o3,%o5,%o3 ! lop.dl_lop - rop.dl_lop (set carry) 607c478bd9Sstevel@tonic-gate subxcc %o2,%o4,%o2 ! lop.dl_hop - rop.dl_hop - <carry> 617c478bd9Sstevel@tonic-gate ld [%sp+(16*4)],%o0 ! address to store result into 627c478bd9Sstevel@tonic-gate st %o2,[%o0] ! store result.dl_hop 637c478bd9Sstevel@tonic-gate jmp %o7+12 ! return 647c478bd9Sstevel@tonic-gate st %o3,[%o0+4] ! store result.dl_lop 657c478bd9Sstevel@tonic-gate 667c478bd9Sstevel@tonic-gate SET_SIZE(lsub) 67