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      1  1.5      matt /*	$NetBSD: alloca.S,v 1.5 2013/08/17 01:07:45 matt Exp $	*/
      2  1.1     bjh21 
      3  1.1     bjh21 /*
      4  1.1     bjh21  * Copyright (c) 1995 Mark Brinicombe
      5  1.1     bjh21  * All rights reserved.
      6  1.1     bjh21  *
      7  1.1     bjh21  * Redistribution and use in source and binary forms, with or without
      8  1.1     bjh21  * modification, are permitted provided that the following conditions
      9  1.1     bjh21  * are met:
     10  1.1     bjh21  * 1. Redistributions of source code must retain the above copyright
     11  1.1     bjh21  *    notice, this list of conditions and the following disclaimer.
     12  1.1     bjh21  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.1     bjh21  *    notice, this list of conditions and the following disclaimer in the
     14  1.1     bjh21  *    documentation and/or other materials provided with the distribution.
     15  1.1     bjh21  * 3. All advertising materials mentioning features or use of this software
     16  1.1     bjh21  *    must display the following acknowledgement:
     17  1.1     bjh21  *	This product includes software developed by Mark Brinicombe
     18  1.1     bjh21  * 4. Neither the name of the University nor the names of its contributors
     19  1.1     bjh21  *    may be used to endorse or promote products derived from this software
     20  1.1     bjh21  *    without specific prior written permission.
     21  1.1     bjh21  *
     22  1.1     bjh21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     23  1.1     bjh21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  1.1     bjh21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  1.1     bjh21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     26  1.1     bjh21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  1.1     bjh21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  1.1     bjh21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  1.1     bjh21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  1.1     bjh21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  1.1     bjh21  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  1.1     bjh21  * SUCH DAMAGE.
     33  1.1     bjh21  */
     34  1.1     bjh21 
     35  1.1     bjh21 /* like alloc, but automatic automatic free in return */
     36  1.1     bjh21 
     37  1.1     bjh21 #include <machine/asm.h>
     38  1.1     bjh21 
     39  1.1     bjh21 ENTRY(alloca)
     40  1.5      matt 	adds	r0, r0, #7	/* round up to next 8 byte alignment */
     41  1.5      matt #if !defined(__thumb__) || defined(_ARM_ARCH_T2)
     42  1.5      matt 	bics	r0, r0, #7
     43  1.5      matt 	sub	sp, sp, r0	/* Adjust the stack pointer */
     44  1.5      matt 	mov	r0, sp		/* r0 = base of new space */
     45  1.5      matt #else
     46  1.5      matt 	lsrs	r0, r0, #3
     47  1.5      matt 	lsls	r0, r0, #3
     48  1.5      matt 	mov	r1, sp
     49  1.5      matt 	subs	r0, r1, r0	/* Adjust the stack pointer */
     50  1.5      matt 	mov	sp, r0		/* r0 = base of new space */
     51  1.5      matt #endif
     52  1.4  rearnsha 	RET
     53  1.5      matt END(alloca)
     54