minix/lib/libc/arch/m68k/gen/alloca.S

62 lines
2.5 KiB
ArmAsm
Raw Normal View History

/* $NetBSD: alloca.S,v 1.9 2013/07/17 04:57:55 matt 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 1.9 2013/07/17 04:57:55 matt 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)