11.9Suebayasi/* $NetBSD: alloca.S,v 1.9 2014/05/23 02:34:19 uebayasi Exp $ */ 21.5Schristos 31.1Scgd/*- 41.1Scgd * Copyright (c) 1990 The Regents of the University of California. 51.1Scgd * All rights reserved. 61.1Scgd * 71.1Scgd * This code is derived from software contributed to Berkeley by 81.1Scgd * William Jolitz. 91.1Scgd * 101.1Scgd * Redistribution and use in source and binary forms, with or without 111.1Scgd * modification, are permitted provided that the following conditions 121.1Scgd * are met: 131.1Scgd * 1. Redistributions of source code must retain the above copyright 141.1Scgd * notice, this list of conditions and the following disclaimer. 151.1Scgd * 2. Redistributions in binary form must reproduce the above copyright 161.1Scgd * notice, this list of conditions and the following disclaimer in the 171.1Scgd * documentation and/or other materials provided with the distribution. 181.8Sagc * 3. Neither the name of the University nor the names of its contributors 191.1Scgd * may be used to endorse or promote products derived from this software 201.1Scgd * without specific prior written permission. 211.1Scgd * 221.1Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 231.1Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 241.1Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 251.1Scgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 261.1Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 271.1Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 281.1Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 291.1Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 301.1Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 311.1Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 321.1Scgd * SUCH DAMAGE. 331.2Sjtc * 341.2Sjtc * from: @(#)alloca.s 5.2 (Berkeley) 5/14/90 351.1Scgd */ 361.1Scgd 371.4Sjtc#include <machine/asm.h> 381.2Sjtc#if defined(LIBC_SCCS) 391.9Suebayasi RCSID("$NetBSD: alloca.S,v 1.9 2014/05/23 02:34:19 uebayasi Exp $") 401.2Sjtc#endif 411.1Scgd 421.6Satatat/* like alloc, but automatic free in return */ 431.1Scgd 441.1ScgdENTRY(alloca) 451.1Scgd popl %edx /* pop return addr */ 461.1Scgd popl %eax /* pop amount to allocate */ 471.1Scgd movl %esp,%ecx 481.1Scgd addl $3,%eax /* round up to next word */ 491.3Smycroft andl $-4,%eax 501.1Scgd subl %eax,%esp 511.1Scgd movl %esp,%eax /* base of newly allocated space */ 521.1Scgd pushl 8(%ecx) /* copy possible saved registers */ 531.1Scgd pushl 4(%ecx) 541.1Scgd pushl 0(%ecx) 551.1Scgd pushl %eax /* dummy to pop at callsite */ 561.7Sross jmp *%edx /* "return" */ 571.9SuebayasiEND(alloca) 58