1*5d9d9091SRichard Lowe/* 2*5d9d9091SRichard Lowe * CDDL HEADER START 3*5d9d9091SRichard Lowe * 4*5d9d9091SRichard Lowe * The contents of this file are subject to the terms of the 5*5d9d9091SRichard Lowe * Common Development and Distribution License (the "License"). 6*5d9d9091SRichard Lowe * You may not use this file except in compliance with the License. 7*5d9d9091SRichard Lowe * 8*5d9d9091SRichard Lowe * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*5d9d9091SRichard Lowe * or http://www.opensolaris.org/os/licensing. 10*5d9d9091SRichard Lowe * See the License for the specific language governing permissions 11*5d9d9091SRichard Lowe * and limitations under the License. 12*5d9d9091SRichard Lowe * 13*5d9d9091SRichard Lowe * When distributing Covered Code, include this CDDL HEADER in each 14*5d9d9091SRichard Lowe * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*5d9d9091SRichard Lowe * If applicable, add the following below this CDDL HEADER, with the 16*5d9d9091SRichard Lowe * fields enclosed by brackets "[]" replaced with your own identifying 17*5d9d9091SRichard Lowe * information: Portions Copyright [yyyy] [name of copyright owner] 18*5d9d9091SRichard Lowe * 19*5d9d9091SRichard Lowe * CDDL HEADER END 20*5d9d9091SRichard Lowe */ 21*5d9d9091SRichard Lowe/* 22*5d9d9091SRichard Lowe * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 23*5d9d9091SRichard Lowe * Use is subject to license terms. 24*5d9d9091SRichard Lowe */ 25*5d9d9091SRichard Lowe 26*5d9d9091SRichard Lowe .file "alloca.s" 27*5d9d9091SRichard Lowe 28*5d9d9091SRichard Lowe#include "SYS.h" 29*5d9d9091SRichard Lowe 30*5d9d9091SRichard Lowe ENTRY(__builtin_alloca) 31*5d9d9091SRichard Lowe popq %rcx /* grab our return address */ 32*5d9d9091SRichard Lowe addq $15, %rdi /* round size up to multiple of 16 */ 33*5d9d9091SRichard Lowe andq $0xfffffffffffffff0, %rdi 34*5d9d9091SRichard Lowe subq %rdi, %rsp /* allocate requested space on stack */ 35*5d9d9091SRichard Lowe movq %rsp, %rax /* pointer to new memory block */ 36*5d9d9091SRichard Lowe jmp *%rcx /* return */ 37*5d9d9091SRichard Lowe SET_SIZE(__builtin_alloca) 38