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/*
* 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, 95, 96, 99, 2001 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/threads.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/mipsregs.h>
#include <asm/asm-offsets.h>
#ifdef CONFIG_MIPS_MT_SMTC
#include <asm/mipsmtregs.h>
#endif /* CONFIG_MIPS_MT_SMTC */
.macro SAVE_AT
.set push
.set noat
LONG_S $1, PT_R1(sp)
.set pop
.endm
.macro SAVE_TEMP
mfhi v1
#ifdef CONFIG_32BIT
LONG_S $8, PT_R8(sp)
LONG_S $9, PT_R9(sp)
#endif
LONG_S v1, PT_HI(sp)
mflo v1
LONG_S $10, PT_R10(sp)
LONG_S $11, PT_R11(sp)
LONG_S v1, PT_LO(sp)
LONG_S $12, PT_R12(sp)
LONG_S $13, PT_R13(sp)
LONG_S $14, PT_R14(sp)
LONG_S $15, PT_R15(sp)
LONG_S $24, PT_R24(sp)
.endm
.macro SAVE_STATIC
LONG_S $16, PT_R16(sp)
LONG_S $17, PT_R17(sp)
LONG_S $18, PT_R18(sp)
LONG_S $19, PT_R19(sp)
LONG_S $20, PT_R20(sp)
LONG_S $21, PT_R21(sp)
LONG_S $22, PT_R22(sp)
LONG_S $23, PT_R23(sp)
LONG_S $30, PT_R30(sp)
.endm
#ifdef CONFIG_SMP
.macro get_saved_sp /* SMP variation */
#ifdef CONFIG_32BIT
#ifdef CONFIG_MIPS_MT_SMTC
.set mips32
mfc0 k0, CP0_TCBIND;
.set mips0
lui k1, %hi(kernelsp)
srl k0, k0, 19
/* No need to shift down and up to clear bits 0-1 */
#else
mfc0 k0, CP0_CONTEXT
lui k1, %hi(kernelsp)
srl k0, k0, 23
#endif
addu k1, k0
LONG_L k1, %lo(kernelsp)(k1)
#endif
#ifdef CONFIG_64BIT
#ifdef CONFIG_MIPS_MT_SMTC
.set mips64
mfc0 k0, CP0_TCBIND;
.set mips0
lui k0, %highest(kernelsp)
dsrl k1, 19
/* No need to shift down and up to clear bits 0-2 */
#else
MFC0 k1, CP0_CONTEXT
lui k0, %highest(kernelsp)
dsrl k1, 23
daddiu k0, %higher(kernelsp)
dsll k0, k0, 16
daddiu k0, %hi(kernelsp)
dsll k0, k0, 16
#endif /* CONFIG_MIPS_MT_SMTC */
daddu k1, k1, k0
LONG_L k1, %lo(kernelsp)(k1)
#endif /* CONFIG_64BIT */
.endm
.macro set_saved_sp stackp temp temp2
#ifdef CONFIG_32BIT
#ifdef CONFIG_MIPS_MT_SMTC
mfc0 \temp, CP0_TCBIND
srl \temp, 19
#else
mfc0 \temp, CP0_CONTEXT
srl \temp, 23
#endif
#endif
#ifdef CONFIG_64BIT
#ifdef CONFIG_MIPS_MT_SMTC
mfc0 \temp, CP0_TCBIND
dsrl \temp, 19
#else
MFC0 \temp, CP0_CONTEXT
dsrl \temp, 23
#endif
#endif
LONG_S \stackp, kernelsp(\temp)
.endm
#else
.macro get_saved_sp /* Uniprocessor variation */
#ifdef CONFIG_64BIT
lui k1, %highest(kernelsp)
daddiu k1, %higher(kernelsp)
dsll k1, k1, 16
daddiu k1, %hi(kernelsp)
dsll k1, k1, 16
#else
lui k1, %hi(kernelsp)
#endif
LONG_L k1, %lo(kernelsp)(k1)
.endm
.macro set_saved_sp stackp temp temp2
LONG_S \stackp, kernelsp
.endm
#endif
.macro SAVE_SOME
.set push
.set noat
.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. */
get_saved_sp
8: move k0, sp
PTR_SUBU sp, k1, PT_SIZE
LONG_S k0, PT_R29(sp)
LONG_S $3, PT_R3(sp)
/*
* You might think that you don't need to save $0,
* but the FPU emulator and gdb remote debug stub
* need it to operate correctly
*/
LONG_S $0, PT_R0(sp)
mfc0 v1, CP0_STATUS
LONG_S $2, PT_R2(sp)
LONG_S v1, PT_STATUS(sp)
#ifdef CONFIG_MIPS_MT_SMTC
/*
* Ideally, these instructions would be shuffled in
* to cover the pipeline delay.
*/
.set mips32
mfc0 v1, CP0_TCSTATUS
.set mips0
LONG_S v1, PT_TCSTATUS(sp)
#endif /* CONFIG_MIPS_MT_SMTC */
LONG_S $4, PT_R4(sp)
mfc0 v1, CP0_CAUSE
LONG_S $5, PT_R5(sp)
LONG_S v1, PT_CAUSE(sp)
LONG_S $6, PT_R6(sp)
MFC0 v1, CP0_EPC
LONG_S $7, PT_R7(sp)
#ifdef CONFIG_64BIT
LONG_S $8, PT_R8(sp)
LONG_S $9, PT_R9(sp)
#endif
LONG_S v1, PT_EPC(sp)
LONG_S $25, PT_R25(sp)
LONG_S $28, PT_R28(sp)
LONG_S $31, PT_R31(sp)
ori $28, sp, _THREAD_MASK
xori $28, _THREAD_MASK
.set pop
.endm
.macro SAVE_ALL
SAVE_SOME
SAVE_AT
SAVE_TEMP
SAVE_STATIC
.endm
.macro RESTORE_AT
.set push
.set noat
LONG_L $1, PT_R1(sp)
.set pop
.endm
.macro RESTORE_TEMP
LONG_L $24, PT_LO(sp)
#ifdef CONFIG_32BIT
LONG_L $8, PT_R8(sp)
LONG_L $9, PT_R9(sp)
#endif
mtlo $24
LONG_L $24, PT_HI(sp)
LONG_L $10, PT_R10(sp)
LONG_L $11, PT_R11(sp)
mthi $24
LONG_L $12, PT_R12(sp)
LONG_L $13, PT_R13(sp)
LONG_L $14, PT_R14(sp)
LONG_L $15, PT_R15(sp)
LONG_L $24, PT_R24(sp)
.endm
.macro RESTORE_STATIC
LONG_L $16, PT_R16(sp)
LONG_L $17, PT_R17(sp)
LONG_L $18, PT_R18(sp)
LONG_L $19, PT_R19(sp)
LONG_L $20, PT_R20(sp)
LONG_L $21, PT_R21(sp)
LONG_L $22, PT_R22(sp)
LONG_L $23, PT_R23(sp)
LONG_L $30, PT_R30(sp)
.endm
#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
.macro RESTORE_SOME
.set push
.set reorder
.set noat
mfc0 a0, CP0_STATUS
ori a0, 0x1f
xori a0, 0x1f
mtc0 a0, CP0_STATUS
li v1, 0xff00
and a0, v1
LONG_L v0, PT_STATUS(sp)
nor v1, $0, v1
and v0, v1
or v0, a0
mtc0 v0, CP0_STATUS
LONG_L $31, PT_R31(sp)
LONG_L $28, PT_R28(sp
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