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alloca.S revision 1.1.22.1 
      1       1.1    ragge /*-
      2       1.1    ragge  * Copyright (c) 1991, 1993
      3       1.1    ragge  *	The Regents of the University of California.  All rights reserved.
      4       1.1    ragge  *
      5       1.1    ragge  * Redistribution and use in source and binary forms, with or without
      6       1.1    ragge  * modification, are permitted provided that the following conditions
      7       1.1    ragge  * are met:
      8       1.1    ragge  * 1. Redistributions of source code must retain the above copyright
      9       1.1    ragge  *    notice, this list of conditions and the following disclaimer.
     10       1.1    ragge  * 2. Redistributions in binary form must reproduce the above copyright
     11       1.1    ragge  *    notice, this list of conditions and the following disclaimer in the
     12       1.1    ragge  *    documentation and/or other materials provided with the distribution.
     13       1.1    ragge  * 3. All advertising materials mentioning features or use of this software
     14       1.1    ragge  *    must display the following acknowledgement:
     15       1.1    ragge  *	This product includes software developed by the University of
     16       1.1    ragge  *	California, Berkeley and its contributors.
     17       1.1    ragge  * 4. Neither the name of the University nor the names of its contributors
     18       1.1    ragge  *    may be used to endorse or promote products derived from this software
     19       1.1    ragge  *    without specific prior written permission.
     20       1.1    ragge  *
     21       1.1    ragge  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22       1.1    ragge  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23       1.1    ragge  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24       1.1    ragge  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25       1.1    ragge  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26       1.1    ragge  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27       1.1    ragge  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28       1.1    ragge  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29       1.1    ragge  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30       1.1    ragge  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31       1.1    ragge  * SUCH DAMAGE.
     32       1.1    ragge  */
     33       1.1    ragge 
     34       1.1    ragge #if defined(LIBC_SCCS) && !defined(lint)
     35       1.1    ragge 	/* .asciz "@(#)alloca.s	8.1 (Berkeley) 6/4/93" */
     36  1.1.22.1  nathanw 	.asciz "$NetBSD: alloca.S,v 1.1.22.1 2002/03/08 21:34:54 nathanw Exp $"
     37       1.1    ragge #endif /* LIBC_SCCS and not lint */
     38       1.1    ragge 
     39       1.1    ragge #include "DEFS.h"
     40       1.1    ragge 
     41       1.1    ragge ENTRY(alloca, 0)
     42  1.1.22.1  nathanw 	movl	4(%ap),%r0	# get allocation size
     43  1.1.22.1  nathanw 	movl	16(%fp),%r2	# save return address before we smash it
     44  1.1.22.1  nathanw 	movab	here,16(%fp)
     45       1.1    ragge 	ret
     46       1.1    ragge here:
     47  1.1.22.1  nathanw 	subl2	%r0,%sp		# create stack space
     48  1.1.22.1  nathanw 	bicl2	$3,%sp		# align to longword boundary
     49  1.1.22.1  nathanw 	movl	%sp,%r0
     50  1.1.22.1  nathanw 	jmp	(%r2)
     51