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/* $NetBSD: setstack.S,v 1.1 2001/07/28 13:28:03 chris Exp $ */
/*-
* Copyright (c) 1994 Mark Brinicombe.
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Brini.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BRINI ``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 BRINI 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.
*
* RiscBSD kernel project
*
* setstack.S
*
* Miscellaneous routine to play with the stack pointer in different CPU modes
*
* Eventually this routine can be inline assembly.
*
* Created : 17/09/94
*
* Based of kate/display/setstack.s
*
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#include <machine/armreg.h>
/* To set the stack pointer for a particular mode we must switch
* to that mode update the banked r13 and then switch back.
* This routine provides an easy way of doing this for any mode
*
* r0 = CPU mode
* r1 = stackptr
*/
ENTRY(set_stackptr)
mrs r3, cpsr /* Switch to the appropriate mode */
bic r2, r3, #(PSR_MODE)
orr r2, r2, r0
msr cpsr_fsxc, r2
mov sp, r1 /* Set the stack pointer */
msr cpsr_fsxc, r3 /* Restore the old mode */
mov pc, lr /* Exit */
END(set_stackptr)
/* To get the stack pointer for a particular mode we must switch
* to that mode copy the banked r13 and then switch back.
* This routine provides an easy way of doing this for any mode
*
* r0 = CPU mode
*/
ENTRY(get_stackptr)
mrs r3, cpsr /* Switch to the appropriate mode */
bic r2, r3, #(PSR_MODE)
orr r2, r2, r0
msr cpsr_fsxc, r2
mov r0, sp /* Set the stack pointer */
msr cpsr_fsxc, r3 /* Restore the old mode */
mov pc, lr /* Exit */
END(get_stackptr)
/* End of setstack.S */
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