1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 .file "alloca.s" 27 28#include "SYS.h" 29 30 ENTRY(__builtin_alloca) 31 popq %rcx /* grab our return address */ 32 addq $15, %rdi /* round size up to multiple of 16 */ 33 andq $0xfffffffffffffff0, %rdi 34 subq %rdi, %rsp /* allocate requested space on stack */ 35 movq %rsp, %rax /* pointer to new memory block */ 36 jmp *%rcx /* return */ 37 SET_SIZE(__builtin_alloca) 38