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 5*9a70fc3bSMark J. Nelson * Common Development and Distribution License (the "License"). 6*9a70fc3bSMark 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 26*9a70fc3bSMark J. Nelson .file "alloca.s" 277c478bd9Sstevel@tonic-gate 287c478bd9Sstevel@tonic-gate#include "SYS.h" 297c478bd9Sstevel@tonic-gate 307c478bd9Sstevel@tonic-gate ENTRY(__builtin_alloca) 317c478bd9Sstevel@tonic-gate popq %rcx /* grab our return address */ 327c478bd9Sstevel@tonic-gate addq $15, %rdi /* round size up to multiple of 16 */ 337c478bd9Sstevel@tonic-gate andq $0xfffffffffffffff0, %rdi 347c478bd9Sstevel@tonic-gate subq %rdi, %rsp /* allocate requested space on stack */ 357c478bd9Sstevel@tonic-gate movq %rsp, %rax /* pointer to new memory block */ 367c478bd9Sstevel@tonic-gate jmp *%rcx /* return */ 377c478bd9Sstevel@tonic-gate SET_SIZE(__builtin_alloca) 38