/* $OpenBSD: alloca.S,v 1.6 2005/08/07 11:30:38 espie Exp $ */
/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * 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.
 */

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

#define _C_LABEL(x) x
#ifdef __i386__
#define _ALIGN_TEXT .align 2, 0x90
#else /* __x86_64__ */
#define _ALIGN_TEXT .align 16, 0x90
#endif
#define _ENTRY(x)   .text; _ALIGN_TEXT; .globl x; .type x,@function; x:
#define ENTRY(y)    _ENTRY(_C_LABEL(y));

ENTRY(alloca)
#ifdef __i386__
	popl	%edx		/*  pop return addr */
	popl	%eax		/*  pop amount to allocate */
	movl	%esp,%ecx
	addl	$3,%eax		/*  round up to next word */
	andl	$-4,%eax
	subl	%eax,%esp
	movl	%esp,%eax	/* base of newly allocated space */
	pushl	8(%ecx)		/* copy possible saved registers */
	pushl	4(%ecx)
	pushl	0(%ecx)
	pushl	%eax		/* dummy to pop at callsite */
	jmp	*%edx		    /* "return" */
#else /* __x86_64__ */
	popq	%rdx
	movq	%rsp,%rcx
	addq	$15,%rdi	/*  round up to 16 bytes */
	andq	$~15,%rdi
	subq	%rdi,%rsp
	movq	%rsp,%rax
	jmp	*%rdx
#endif
