Home | History | Annotate | Line # | Download | only in gen
alloca.S revision 1.1 
      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  ragge 	.asciz "$NetBSD: alloca.S,v 1.1 1995/04/17 12:23:38 ragge 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  ragge 	movl	4(ap),r0	# get allocation size
     43  1.1  ragge 	movl	16(fp),r2	# save return address before we smash it
     44  1.1  ragge 	movab	here,16(fp)
     45  1.1  ragge 	ret
     46  1.1  ragge here:
     47  1.1  ragge 	subl2	r0,sp		# create stack space
     48  1.1  ragge 	bicl2	$3,sp		# align to longword boundary
     49  1.1  ragge 	movl	sp,r0
     50  1.1  ragge 	jmp	(r2)
     51