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 59a70fc3bSMark J. Nelson * Common Development and Distribution License (the "License"). 69a70fc3bSMark J. Nelson * 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 */ 217c478bd9Sstevel@tonic-gate/* 227c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 237c478bd9Sstevel@tonic-gate * Use is subject to license terms. 247c478bd9Sstevel@tonic-gate */ 257c478bd9Sstevel@tonic-gate 269a70fc3bSMark J. Nelson .file "_xtoull.s" 277c478bd9Sstevel@tonic-gate 287c478bd9Sstevel@tonic-gate#include <SYS.h> 297c478bd9Sstevel@tonic-gate 307c478bd9Sstevel@tonic-gate .set cw,0 317c478bd9Sstevel@tonic-gate .set cw_old,2 327c478bd9Sstevel@tonic-gate .set two_words,4 337c478bd9Sstevel@tonic-gate .set four_words,8 347c478bd9Sstevel@tonic-gate .text 357c478bd9Sstevel@tonic-gate .align 4 367c478bd9Sstevel@tonic-gatetwo_to_63: .long 0x5f000000 377c478bd9Sstevel@tonic-gate 387c478bd9Sstevel@tonic-gate ENTRY(__xtoull) // 387-stack to unsigned long long 397c478bd9Sstevel@tonic-gate subl $12,%esp 407c478bd9Sstevel@tonic-gate fstcw cw_old(%esp) 417c478bd9Sstevel@tonic-gate movw cw_old(%esp),%ax 427c478bd9Sstevel@tonic-gate movw %ax,%cx 437c478bd9Sstevel@tonic-gate andw $0x0c00,%cx // save RC 447c478bd9Sstevel@tonic-gate orw $0x0c00,%ax 457c478bd9Sstevel@tonic-gate movw %ax,cw(%esp) 467c478bd9Sstevel@tonic-gate fldcw cw(%esp) 477c478bd9Sstevel@tonic-gate _prologue_ 487c478bd9Sstevel@tonic-gate fcoms _sref_(two_to_63) // compare st to 2**63 497c478bd9Sstevel@tonic-gate _epilogue_ 507c478bd9Sstevel@tonic-gate fstsw %ax // store status in %ax 517c478bd9Sstevel@tonic-gate // use fstsw for correct trap handling 527c478bd9Sstevel@tonic-gate sahf // load AH into flags 537c478bd9Sstevel@tonic-gate jb .donotsub // jump if st < 2**63 or is NaN 547c478bd9Sstevel@tonic-gate _prologue_ 557c478bd9Sstevel@tonic-gate fsubs _sref_(two_to_63) // subtract 2**63 567c478bd9Sstevel@tonic-gate _epilogue_ 577c478bd9Sstevel@tonic-gate.donotsub: 587c478bd9Sstevel@tonic-gate fistpll two_words(%esp) 597c478bd9Sstevel@tonic-gate fwait // in case fistpll causes exception 607c478bd9Sstevel@tonic-gate movl four_words(%esp),%edx 617c478bd9Sstevel@tonic-gate jb .donotadd // flags did not change 627c478bd9Sstevel@tonic-gate add $0x80000000,%edx // add back 2**63 637c478bd9Sstevel@tonic-gate.donotadd: 647c478bd9Sstevel@tonic-gate fstcw cw(%esp) // fetch CW in case masks changed value 657c478bd9Sstevel@tonic-gate movw cw(%esp),%ax 667c478bd9Sstevel@tonic-gate andw $0xf3ff,%ax 677c478bd9Sstevel@tonic-gate orw %cx,%ax // restore RC 687c478bd9Sstevel@tonic-gate movw %ax,cw(%esp) 697c478bd9Sstevel@tonic-gate fldcw cw(%esp) 707c478bd9Sstevel@tonic-gate movl two_words(%esp),%eax 717c478bd9Sstevel@tonic-gate addl $12,%esp 727c478bd9Sstevel@tonic-gate ret 737c478bd9Sstevel@tonic-gate SET_SIZE(__xtoull) 74