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/* $OpenBSD: uthread_machdep_asm.S,v 1.2 2004/02/21 05:29:16 drahn Exp $ */
/*
* Copyright (c) 2004 Dale Rahn. All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
*/
#include <machine/asm.h>
/* THESE MUST BE IN SYNC WITH uthread_machdep.c:struct frame */
#define OFFSET_R 0 /* offsetof(struct frame, r) */
#define OFFSET_FP ((12-4)*4)
#define OFFSET_LR (OFFSET_FP+4)
#define OFFSET_CPSR (OFFSET_LR+4)
#define OFFSET_FPR (OFFSET_CPSR+4)
#define OFFSET_FS (OFFSET_FPR+(6*8))
#define FRAME_SIZE (OFFSET_FS+4)
/*
* r0 is pointer to new save area - restore from here
* r1 is pointer to old save area - put pointer to stack save area here
*/
ENTRY(_thread_machdep_switch)
mov ip, sp
sub sp, sp, #FRAME_SIZE+4
add r2, sp, #4
stmia r2, {r4-r11}
str fp, [r2, #OFFSET_FP]
str lr, [r2, #OFFSET_LR]
mrs r3, cpsr_all
str r3, [r2, #OFFSET_CPSR]
#ifndef __VFP_FP__
sfm f4, 4, [r2, #OFFSET_FPR]
rfs r3
str r3, [r2, #OFFSET_FS]
#endif
str sp, [r1, #0]
ldr sp, [r0, #0]
add r2, sp, #4
ldmfd r2, {r4-r11}
ldr fp, [r2, #OFFSET_FP]
ldr lr, [r2, #OFFSET_LR]
ldr r3, [r2, #OFFSET_CPSR]
msr cpsr_f, r3
#ifndef __VFP_FP__
lfm f4, 4, [r2, #OFFSET_FPR]
ldr r3, [r2, #OFFSET_FS]
wfs r3
#endif
add sp, sp, #FRAME_SIZE+4
mov pc, lr
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