alloca.S revision 1.1
11.1Spaulus/*- 21.1Spaulus * Copyright (c) 1990 The Regents of the University of California. 31.1Spaulus * All rights reserved. 41.1Spaulus * 51.1Spaulus * This code is derived from software contributed to Berkeley by 61.1Spaulus * the Systems Programming Group of the University of Utah Computer 71.1Spaulus * Science Department. 81.1Spaulus * 91.1Spaulus * Redistribution and use in source and binary forms, with or without 101.1Spaulus * modification, are permitted provided that the following conditions 111.1Spaulus * are met: 121.1Spaulus * 1. Redistributions of source code must retain the above copyright 131.1Spaulus * notice, this list of conditions and the following disclaimer. 141.1Spaulus * 2. Redistributions in binary form must reproduce the above copyright 151.1Spaulus * notice, this list of conditions and the following disclaimer in the 161.1Spaulus * documentation and/or other materials provided with the distribution. 171.1Spaulus * 3. All advertising materials mentioning features or use of this software 181.1Spaulus * must display the following acknowledgement: 191.1Spaulus * This product includes software developed by the University of 201.1Spaulus * California, Berkeley and its contributors. 211.1Spaulus * 4. Neither the name of the University nor the names of its contributors 221.1Spaulus * may be used to endorse or promote products derived from this software 231.1Spaulus * without specific prior written permission. 241.1Spaulus * 251.1Spaulus * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 261.1Spaulus * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 271.1Spaulus * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 281.1Spaulus * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 291.1Spaulus * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 301.1Spaulus * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 311.1Spaulus * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 321.1Spaulus * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 331.1Spaulus * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 341.1Spaulus * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 351.1Spaulus * SUCH DAMAGE. 361.1Spaulus */ 371.1Spaulus 381.1Spaulus#if defined(LIBC_SCCS) && !defined(lint) 391.1Spaulus .text 401.1Spaulus /*.asciz "from: @(#)alloca.s 5.1 (Berkeley) 5/12/90"*/ 411.1Spaulus .asciz "$Id: alloca.S,v 1.1 1993/11/25 23:36:50 paulus Exp $" 421.1Spaulus#endif /* LIBC_SCCS and not lint */ 431.1Spaulus 441.1Spaulus/* like alloc, but automatic free in return */ 451.1Spaulus 461.1Spaulus#include "DEFS.h" 471.1Spaulus 481.1SpaulusENTRY(alloca) 491.1Spaulus movl sp@,a0 /* save return addr */ 501.1Spaulus movl sp,d0 /* get current SP value */ 511.1Spaulus subl sp@(4),d0 /* allocate requested space */ 521.1Spaulus andb #~3,d0 /* longword align for efficiency */ 531.1Spaulus addql #8,d0 /* reuse space of call frame */ 541.1Spaulus movl d0,sp /* set new SP value */ 551.1Spaulus lea sp@(-4),sp /* account for argument pop in caller */ 561.1Spaulus jmp a0@ /* funny return */ 57