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alloca.S revision 1.4.4.1 
      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      1.3    agc  * 3. Neither the name of the University nor the names of its contributors
     14      1.1  ragge  *    may be used to endorse or promote products derived from this software
     15      1.1  ragge  *    without specific prior written permission.
     16      1.1  ragge  *
     17      1.1  ragge  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     18      1.1  ragge  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     19      1.1  ragge  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20      1.1  ragge  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     21      1.1  ragge  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22      1.1  ragge  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     23      1.1  ragge  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24      1.1  ragge  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25      1.1  ragge  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26      1.1  ragge  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27      1.1  ragge  * SUCH DAMAGE.
     28      1.1  ragge  */
     29      1.1  ragge 
     30      1.4   matt #include "DEFS.h"
     31      1.4   matt 
     32      1.1  ragge #if defined(LIBC_SCCS) && !defined(lint)
     33      1.1  ragge 	/* .asciz "@(#)alloca.s	8.1 (Berkeley) 6/4/93" */
     34  1.4.4.1   yamt RCSID("$NetBSD: alloca.S,v 1.4.4.1 2012/04/17 00:05:15 yamt Exp $")
     35      1.1  ragge #endif /* LIBC_SCCS and not lint */
     36      1.1  ragge 
     37      1.1  ragge ENTRY(alloca, 0)
     38      1.2   matt 	movl	4(%ap),%r0	# get allocation size
     39  1.4.4.1   yamt 	movl	16(%fp),%r1	# save return address before we smash it
     40      1.2   matt 	movab	here,16(%fp)
     41      1.1  ragge 	ret
     42      1.1  ragge here:
     43      1.2   matt 	subl2	%r0,%sp		# create stack space
     44      1.2   matt 	bicl2	$3,%sp		# align to longword boundary
     45      1.2   matt 	movl	%sp,%r0
     46  1.4.4.1   yamt 	jmp	(%r1)
     47      1.4   matt END(alloca)
     48