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/* $Id: stackframe.h,v 1.3 1999/12/04 03:59:12 ralf Exp $
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994, 1995, 1996, 1999 Ralf Baechle
* Copyright (C) 1994, 1995, 1996 Paul M. Antoine.
* Copyright (C) 1999 Silicon Graphics, Inc.
*/
#ifndef _ASM_STACKFRAME_H
#define _ASM_STACKFRAME_H
#include <linux/config.h>
#include <asm/asm.h>
#include <asm/offset.h>
#include <asm/processor.h>
#include <asm/addrspace.h>
#ifdef _LANGUAGE_C
#define __str2(x) #x
#define __str(x) __str2(x)
#define save_static(frame) \
__asm__ __volatile__( \
"sd\t$16,"__str(PT_R16)"(%0)\n\t" \
"sd\t$17,"__str(PT_R17)"(%0)\n\t" \
"sd\t$18,"__str(PT_R18)"(%0)\n\t" \
"sd\t$19,"__str(PT_R19)"(%0)\n\t" \
"sd\t$20,"__str(PT_R20)"(%0)\n\t" \
"sd\t$21,"__str(PT_R21)"(%0)\n\t" \
"sd\t$22,"__str(PT_R22)"(%0)\n\t" \
"sd\t$23,"__str(PT_R23)"(%0)\n\t" \
"sd\t$30,"__str(PT_R30)"(%0)\n\t" \
: /* No outputs */ \
: "r" (frame))
#endif /* _LANGUAGE_C */
#ifdef _LANGUAGE_ASSEMBLY
.macro SAVE_AT
.set push
.set noat
sd $1, PT_R1(sp)
.set pop
.endm
.macro SAVE_TEMP
mfhi v1
sd $8, PT_R8(sp)
sd $9, PT_R9(sp)
sd v1, PT_HI(sp)
mflo v1
sd $10, PT_R10(sp)
sd $11, PT_R11(sp)
sd v1, PT_LO(sp)
sd $12, PT_R12(sp)
sd $13, PT_R13(sp)
sd $14, PT_R14(sp)
sd $15, PT_R15(sp)
sd $24, PT_R24(sp)
.endm
.macro SAVE_STATIC
sd $16, PT_R16(sp)
sd $17, PT_R17(sp)
sd $18, PT_R18(sp)
sd $19, PT_R19(sp)
sd $20, PT_R20(sp)
sd $21, PT_R21(sp)
sd $22, PT_R22(sp)
sd $23, PT_R23(sp)
sd $30, PT_R30(sp)
.endm
.macro SAVE_SOME
.set push
.set reorder
mfc0 k0, CP0_STATUS
sll k0, 3 /* extract cu0 bit */
.set noreorder
bltz k0, 8f
move k1, sp
.set reorder
/* Called from user mode, new stack. */
#ifndef CONFIG_SMP
lui k1, %hi(kernelsp)
ld k1, %lo(kernelsp)(k1)
#else
mfc0 k0, CP0_WATCHLO
mfc0 k1, CP0_WATCHHI
dsll32 k0, k0, 0 /* Get rid of sign extension */
dsrl32 k0, k0, 0 /* Get rid of sign extension */
dsll32 k1, k1, 0
or k1, k1, k0
li k0, K0BASE
or k1, k1, k0
daddiu k1, k1, KERNEL_STACK_SIZE-32
#endif
8: move k0, sp
dsubu sp, k1, PT_SIZE
sd k0, PT_R29(sp)
sd $3, PT_R3(sp)
sd $0, PT_R0(sp)
dmfc0 v1, CP0_STATUS
sd $2, PT_R2(sp)
sd v1, PT_STATUS(sp)
sd $4, PT_R4(sp)
dmfc0 v1, CP0_CAUSE
sd $5, PT_R5(sp)
sd v1, PT_CAUSE(sp)
sd $6, PT_R6(sp)
dmfc0 v1, CP0_EPC
sd $7, PT_R7(sp)
sd v1, PT_EPC(sp)
sd $25, PT_R25(sp)
sd $28, PT_R28(sp)
sd $31, PT_R31(sp)
ori $28, sp, 0x3fff
xori $28, 0x3fff
.set pop
.endm
.macro SAVE_ALL
SAVE_SOME
SAVE_AT
SAVE_TEMP
SAVE_STATIC
.endm
.macro RESTORE_AT
.set push
.set noat
ld $1, PT_R1(sp)
.set pop
.endm
.macro RESTORE_SP
ld sp, PT_R29(sp)
.endm
.macro RESTORE_TEMP
ld $24, PT_LO(sp)
ld $8, PT_R8(sp)
ld $9, PT_R9(sp)
mtlo $24
ld $24, PT_HI(sp)
ld $10, PT_R10(sp)
ld $11, PT_R11(sp)
mthi $24
ld $12, PT_R12(sp)
ld $13, PT_R13(sp)
ld $14, PT_R14(sp)
ld $15, PT_R15(sp)
ld $24, PT_R24(sp)
.endm
.macro RESTORE_STATIC
ld $16, PT_R16(sp)
ld $17, PT_R17(sp)
ld $18, PT_R18(sp)
ld $19, PT_R19(sp)
ld $20, PT_R20(sp)
ld $21, PT_R21(sp)
ld $22, PT_R22(sp)
ld $23, PT_R23(sp)
ld $30, PT_R30(sp)
.endm
.macro RESTORE_SOME
.set push
.set reorder
mfc0 t0, CP0_STATUS
.set pop
ori t0, 0x1f
xori t0, 0x1f
mtc0 t0, CP0_STATUS
li v1, 0xff00
and t0, v1
ld v0, PT_STATUS(sp)
nor v1, $0, v1
and v0, v1
or v0, t0
dmtc0 v0, CP0_STATUS
ld v1, PT_EPC(sp)
dmtc0 v1, CP0_EPC
ld $31, PT_R31(sp)
ld $28, PT_R28(sp)
ld $25, PT_R25(sp)
ld $7, PT_R7(sp)
ld $6, PT_R6(sp)
ld $5, PT_R5(sp)
ld $4, PT_R4(sp)
ld $3, PT_R3(sp)
ld $2, PT_R2(sp)
.endm
.macro RESTORE_ALL
RESTORE_SOME
RESTORE_AT
RESTORE_TEMP
RESTORE_STATIC
RESTORE_SP
.endm
/*
* Move to kernel mode and disable interrupts.
* Set cp0 enable bit as sign that we're running on the kernel stack
*/
.macro CLI
mfc0 t0, CP0_STATUS
li t1, ST0_CU0|0x1f
or t0, t1
xori t0, 0x1f
mtc0 t0, CP0_STATUS
.endm
/*
* Move to kernel mode and enable interrupts.
* Set cp0 enable bit as sign that we're running on the kernel stack
*/
.macro STI
mfc0 t0, CP0_STATUS
li t1, ST0_CU0 | 0x1f
or t0, t1
xori t0, 0x1e
mtc0 t0, CP0_STATUS
.endm
/*
* Just move to kernel mode and leave interrupts as they are.
* Set cp0 enable bit as sign that we're running on the kernel stack
*/
.macro KMODE
mfc0 t0, CP0_STATUS
li t1, ST0_CU0 | 0x1e
or t0, t1
xori t0, 0x1e
mtc0 t0, CP0_STATUS
.endm
#endif /* _LANGUAGE_ASSEMBLY */
#endif /* _ASM_STACKFRAME_H */
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