93 lines
3.1 KiB
ArmAsm
93 lines
3.1 KiB
ArmAsm
/* $NetBSD: setstack.S,v 1.2 2002/08/15 01:37:02 briggs Exp $ */
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/*
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* Copyright (c) 1994 Mark Brinicombe.
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* Copyright (c) 1994 Brini.
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* All rights reserved.
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*
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* This code is derived from software written for Brini by Mark Brinicombe
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Brini.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* RiscBSD kernel project
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*
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* setstack.S
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*
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* Miscellaneous routine to play with the stack pointer in different CPU modes
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*
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* Eventually this routine can be inline assembly.
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*
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* Created : 17/09/94
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*
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* Based of kate/display/setstack.s
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*/
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#include <machine/cpu.h>
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#include <machine/asm.h>
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/* To set the stack pointer for a particular mode we must switch
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* to that mode update the banked r13 and then switch back.
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* This routine provides an easy way of doing this for any mode
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*
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* r0 = CPU mode
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* r1 = stackptr
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*/
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ENTRY(set_stackptr)
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mrs r3, cpsr /* Switch to the appropriate mode */
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bic r2, r3, #(PSR_MODE)
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orr r2, r2, r0
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msr cpsr_all, r2
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mov sp, r1 /* Set the stack pointer */
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msr cpsr_all, r3 /* Restore the old mode */
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mov pc, lr /* Exit */
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/* To get the stack pointer for a particular mode we must switch
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* to that mode copy the banked r13 and then switch back.
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* This routine provides an easy way of doing this for any mode
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*
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* r0 = CPU mode
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*/
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ENTRY(get_stackptr)
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mrs r3, cpsr /* Switch to the appropriate mode */
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bic r2, r3, #(PSR_MODE)
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orr r2, r2, r0
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msr cpsr_all, r2
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mov r0, sp /* Set the stack pointer */
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msr cpsr_all, r3 /* Restore the old mode */
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mov pc, lr /* Exit */
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/* End of setstack.S */
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