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Rebase to HEAD as of a few days ago.

/*	$NetBSD: alloca.S,v 1.6.62.1 2014/08/20 00:02:10 tls Exp $	*/

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <machine/asm.h>

#if defined(LIBC_SCCS) && !defined(lint)
#if 0
	RCSID("from: @(#)alloca.s	5.1 (Berkeley) 5/12/90")
#else
	RCSID("$NetBSD: alloca.S,v 1.6.62.1 2014/08/20 00:02:10 tls Exp $")
#endif
#endif /* LIBC_SCCS and not lint */

/* like alloc, but automatic free in return */

ENTRY(alloca)
	movl	(%sp),%a1	/* save return addr */
	movl	%sp,%d0		/* get current SP value */
	subl	4(%sp),%d0	/* allocate requested space */
	movql	#-4,%d1		/* sign extend a mask */
	andl	%d1,%d0		/* longword align for efficiency */
	addql	#8,%d0		/* reuse space of call frame */
	movl	%d0,%sp		/* set new SP value */
	subql	#4,%sp		/* account for argument pop in caller */
#ifdef __SVR4_ABI__
	moveal	%d0,%a0
#endif
	jmp 	(%a1)		/* funny return */
END(alloca)