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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, 1995, 1996, 2001 Ralf Baechle
* Copyright (C) 1994, 1995, 1996 Paul M. Antoine.
*/
#ifndef __ASM_STACKFRAME_H
#define __ASM_STACKFRAME_H
#include <asm/addrspace.h>
#include <asm/mipsregs.h>
#include <asm/processor.h>
#include <asm/asm.h>
#include <asm/offset.h>
#include <linux/config.h>
#define SAVE_AT \
.set push; \
.set noat; \
sw $1, PT_R1(sp); \
.set pop
#define SAVE_TEMP \
mfhi v1; \
sw $8, PT_R8(sp); \
sw $9, PT_R9(sp); \
sw v1, PT_HI(sp); \
mflo v1; \
sw $10,PT_R10(sp); \
sw $11, PT_R11(sp); \
sw v1, PT_LO(sp); \
sw $12, PT_R12(sp); \
sw $13, PT_R13(sp); \
sw $14, PT_R14(sp); \
sw $15, PT_R15(sp); \
sw $24, PT_R24(sp)
#define SAVE_STATIC \
sw $16, PT_R16(sp); \
sw $17, PT_R17(sp); \
sw $18, PT_R18(sp); \
sw $19, PT_R19(sp); \
sw $20, PT_R20(sp); \
sw $21, PT_R21(sp); \
sw $22, PT_R22(sp); \
sw $23, PT_R23(sp); \
sw $30, PT_R30(sp)
#define __str2(x) #x
#define __str(x) __str2(x)
#define save_static_function(symbol) \
__asm__ ( \
".globl\t" #symbol "\n\t" \
".align\t2\n\t" \
".type\t" #symbol ", @function\n\t" \
".ent\t" #symbol ", 0\n" \
#symbol":\n\t" \
".frame\t$29, 0, $31\n\t" \
"sw\t$16,"__str(PT_R16)"($29)\t\t\t# save_static_function\n\t" \
"sw\t$17,"__str(PT_R17)"($29)\n\t" \
"sw\t$18,"__str(PT_R18)"($29)\n\t" \
"sw\t$19,"__str(PT_R19)"($29)\n\t" \
"sw\t$20,"__str(PT_R20)"($29)\n\t" \
"sw\t$21,"__str(PT_R21)"($29)\n\t" \
"sw\t$22,"__str(PT_R22)"($29)\n\t" \
"sw\t$23,"__str(PT_R23)"($29)\n\t" \
"sw\t$30,"__str(PT_R30)"($29)\n\t" \
".end\t" #symbol "\n\t" \
".size\t" #symbol",. - " #symbol)
/* Used in declaration of save_static functions. */
#define static_unused static __attribute__((unused))
#ifdef CONFIG_SMP
# define GET_SAVED_SP \
mfc0 k0, CP0_CONTEXT; \
lui k1, %hi(kernelsp); \
srl k0, k0, 23; \
sll k0, k0, 2; \
addu k1, k0; \
lw k1, %lo(kernelsp)(k1);
#else
# define GET_SAVED_SP \
lui k1, %hi(kernelsp); \
lw k1, %lo(kernelsp)(k1);
#endif
#define 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. */ \
GET_SAVED_SP \
8: \
move k0, sp; \
subu sp, k1, PT_SIZE; \
sw k0, PT_R29(sp); \
sw $3, PT_R3(sp); \
sw $0, PT_R0(sp); \
mfc0 v1, CP0_STATUS; \
sw $2, PT_R2(sp); \
sw v1, PT_STATUS(sp); \
sw $4, PT_R4(sp); \
mfc0 v1, CP0_CAUSE; \
sw $5, PT_R5(sp); \
sw v1, PT_CAUSE(sp); \
sw $6, PT_R6(sp); \
mfc0 v1, CP0_EPC; \
sw $7, PT_R7(sp); \
sw v1, PT_EPC(sp); \
sw $25, PT_R25(sp); \
sw $28, PT_R28(sp); \
sw $31, PT_R31(sp); \
ori $28, sp, 0x1fff; \
xori $28, 0x1fff; \
.set pop
#define SAVE_ALL \
SAVE_SOME; \
SAVE_AT; \
SAVE_TEMP; \
SAVE_STATIC
#define RESTORE_AT \
.set push; \
.set noat; \
lw $1, PT_R1(sp); \
.set pop;
#define RESTORE_TEMP \
lw $24, PT_LO(sp); \
lw $8, PT_R8(sp); \
lw $9, PT_R9(sp); \
mtlo $24; \
lw $24, PT_HI(sp); \
lw $10,PT_R10(sp); \
lw $11, PT_R11(sp); \
mthi $24; \
lw $12, PT_R12(sp); \
lw $13, PT_R13(sp); \
lw $14, PT_R14(sp); \
lw $15, PT_R15(sp); \
lw $24, PT_R24(sp)
#define RESTORE_STATIC \
lw $16, PT_R16(sp); \
lw $17, PT_R17(sp); \
lw $18, PT_R18(sp); \
lw $19, PT_R19(sp); \
lw $20, PT_R20(sp); \
lw $21, PT_R21(sp); \
lw $22, PT_R22(sp); \
lw $23, PT_R23(sp); \
lw $30, PT_R30(sp)
#if defined(CONFIG_CPU_R3000)
#define 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; \
lw v0, PT_STATUS(sp); \
nor v1, $0, v1; \
and v0, v1; \
or v0, t0; \
mtc0 v0, CP0_STATUS; \
lw $31, PT_R31(sp); \
lw $28, PT_R28(sp); \
lw $25, PT_R25(sp); \
lw $7, PT_R7(sp); \
lw $6, PT_R6(sp); \
lw $5, PT_R5(sp); \
lw $4, PT_R4(sp); \
lw $3, PT_R3(sp); \
lw $2, PT_R2(sp)
#define RESTORE_SP_AND_RET \
.set push; \
.set noreorder; \
lw k0, PT_EPC(sp); \
lw sp, PT_R29(sp); \
jr k0; \
rfe; \
.set pop
#else
#define 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; \
lw v0, PT_STATUS(sp); \
nor v1, $0, v1; \
and v0, v1; \
or v0, t0; \
mtc0 v0, CP0_STATUS; \
lw v1, PT_EPC(sp); \
mtc0 v1, CP0_EPC; \
lw $31, PT_R31(sp); \
lw $28, PT_R28(sp); \
lw $25, PT_R25(sp); \
lw $7, PT_R7(sp); \
lw $6, PT_R6(sp); \
lw $5, PT_R5(sp); \
lw $4, PT_R4(sp); \
lw $3, PT_R3(sp); \
lw $2, PT_R2(sp)
#define RESTORE_SP_AND_RET \
lw sp, PT_R29(sp); \
.set mips3; \
eret; \
.set mips0
#endif
#define RESTORE_SP \
lw sp, PT_R29(sp); \
#define RESTORE_ALL \
RESTORE_SOME; \
RESTORE_AT; \
RESTORE_TEMP; \
RESTORE_STATIC; \
RESTORE_SP
#define RESTORE_ALL_AND_RET \
RESTORE_SOME; \
RESTORE_AT; \
RESTORE_TEMP; \
RESTORE_STATIC; \
RESTORE_SP_AND_RET
/*
* Move to kernel mode and disable interrupts.
* Set cp0 enable bit as sign that we're running on the kernel stack
*/
#define CLI \
mfc0 t0,CP0_STATUS; \
li t1,ST0_CU0|0x1f; \
or t0,t1; \
xori t0,0x1f; \
mtc0 t0,CP0_STATUS
/*
* Move to kernel mode and enable interrupts.
* Set cp0 enable bit as sign that we're running on the kernel stack
*/
#define STI \
mfc0 t0,CP0_STATUS; \
li t1,ST0_CU0|0x1f; \
or t0,t1; \
xori t0,0x1e; \
mtc0 t0,CP0_STATUS
/*
* 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
*/
#define KMODE \
mfc0 t0,CP0_STATUS; \
li t1,ST0_CU0|0x1e; \
or t0,t1; \
xori t0,0x1e; \
mtc0 t0,CP0_STATUS
#endif /* __ASM_STACKFRAME_H */
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