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/*
* File : mips_context_asm.h
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2016��9��7�� Urey the first version
*/
#ifndef _MIPS_CONTEXT_ASM_H_
#define _MIPS_CONTEXT_ASM_H_
#define CONTEXT_SIZE ( STK_CTX_SIZE + FPU_ADJ )
#ifdef __mips_hard_float
#define FPU_ADJ (32 * 4 + 8) /* FP0-FP31 + CP1_STATUS */
#define FPU_CTX ( CONTEXT_SIZE - FPU_ADJ )
#else
#define FPU_ADJ 0
#endif
#ifdef __ASSEMBLY__
#ifdef __mips_hard_float
.global _fpctx_save
.global _fpctx_load
#endif
.macro SAVE_CONTEXT
.set push
.set noat
.set noreorder
.set volatile
//save SP
move k1, sp
move k0, sp
subu sp, k1, CONTEXT_SIZE
sw k0, (29 * 4)(sp)
//save REG
sw $0, ( 0 * 4)(sp)
sw $1, ( 1 * 4)(sp)
sw $2, ( 2 * 4)(sp)
sw $3, ( 3 * 4)(sp)
sw $4, ( 4 * 4)(sp)
sw $5, ( 5 * 4)(sp)
sw $6, ( 6 * 4)(sp)
sw $7, ( 7 * 4)(sp)
sw $8, ( 8 * 4)(sp)
sw $9, ( 9 * 4)(sp)
sw $10, (10 * 4)(sp)
sw $11, (11 * 4)(sp)
sw $12, (12 * 4)(sp)
sw $13, (13 * 4)(sp)
sw $14, (14 * 4)(sp)
sw $15, (15 * 4)(sp)
sw $16, (16 * 4)(sp)
sw $17, (17 * 4)(sp)
sw $18, (18 * 4)(sp)
sw $19, (19 * 4)(sp)
sw $20, (20 * 4)(sp)
sw $21, (21 * 4)(sp)
sw $22, (22 * 4)(sp)
sw $23, (23 * 4)(sp)
sw $24, (24 * 4)(sp)
sw $25, (25 * 4)(sp)
/* K0 K1 */
sw $28, (28 * 4)(sp)
/* SP */
sw $30, (30 * 4)(sp)
sw $31, (31 * 4)(sp)
/* STATUS CAUSE EPC.... */
mfc0 $2, CP0_STATUS
sw $2, STK_OFFSET_SR(sp)
mfc0 $2, CP0_CAUSE
sw $2, STK_OFFSET_CAUSE(sp)
mfc0 $2, CP0_BADVADDR
sw $2, STK_OFFSET_BADVADDR(sp)
MFC0 $2, CP0_EPC
sw $2, STK_OFFSET_EPC(sp)
mfhi $2
sw $2, STK_OFFSET_HI(sp)
mflo $2
sw $2, STK_OFFSET_LO(sp)
#ifdef __mips_hard_float
add a0, sp,STK_CTX_SIZE
mfc0 t0, CP0_STATUS
.set push
.set at
or t0, M_StatusCU1
.set push
mtc0 t0, CP0_STATUS
cfc1 t0, CP1_STATUS
sw t0 , 0x00(a0)
swc1 $f0,(0x04 * 1)(a0)
swc1 $f1,(0x04 * 2)(a0)
swc1 $f2,(0x04 * 3)(a0)
swc1 $f3,(0x04 * 4)(a0)
swc1 $f4,(0x04 * 5)(a0)
swc1 $f5,(0x04 * 6)(a0)
swc1 $f6,(0x04 * 7)(a0)
swc1 $f7,(0x04 * 8)(a0)
swc1 $f8,(0x04 * 9)(a0)
swc1 $f9,(0x04 * 10)(a0)
swc1 $f10,(0x04 * 11)(a0)
swc1 $f11,(0x04 * 12)(a0)
swc1 $f12,(0x04 * 13)(a0)
swc1 $f13,(0x04 * 14)(a0)
swc1 $f14,(0x04 * 15)(a0)
swc1 $f15,(0x04 * 16)(a0)
swc1 $f16,(0x04 * 17)(a0)
swc1 $f17,(0x04 * 18)(a0)
swc1 $f18,(0x04 * 19)(a0)
swc1 $f19,(0x04 * 20)(a0)
swc1 $f20,(0x04 * 21)(a0)
swc1 $f21,(0x04 * 22)(a0)
swc1 $f22,(0x04 * 23)(a0)
swc1 $f23,(0x04 * 24)(a0)
swc1 $f24,(0x04 * 25)(a0)
swc1 $f25,(0x04 * 26)(a0)
swc1 $f26,(0x04 * 27)(a0)
swc1 $f27,(0x04 * 28)(a0)
swc1 $f28,(0x04 * 29)(a0)
swc1 $f29,(0x04 * 30)(a0)
swc1 $f30,(0x04 * 31)(a0)
swc1 $f31,(0x04 * 32)(a0)
nop
#endif
//restore a0
lw a0, (REG_A0 * 4)(sp)
.set pop
.endm
.macro RESTORE_CONTEXT
.set push
.set noat
.set noreorder
.set volatile
#ifdef __mips_hard_float
add a0, sp,STK_CTX_SIZE
mfc0 t0, CP0_STATUS
.set push
.set at
or t0, M_StatusCU1
.set noat
mtc0 t0, CP0_STATUS
lw t0 , 0x00(a0)
lwc1 $f0,(0x04 * 1)(a0)
lwc1 $f1,(0x04 * 2)(a0)
lwc1 $f2,(0x04 * 3)(a0)
lwc1 $f3,(0x04 * 4)(a0)
lwc1 $f4,(0x04 * 5)(a0)
lwc1 $f5,(0x04 * 6)(a0)
lwc1 $f6,(0x04 * 7)(a0)
lwc1 $f7,(0x04 * 8)(a0)
lwc1 $f8,(0x04 * 9)(a0)
lwc1 $f9,(0x04 * 10)(a0)
lwc1 $f10,(0x04 * 11)(a0)
lwc1 $f11,(0x04 * 12)(a0)
lwc1 $f12,(0x04 * 13)(a0)
lwc1 $f13,(0x04 * 14)(a0)
lwc1 $f14,(0x04 * 15)(a0)
lwc1 $f15,(0x04 * 16)(a0)
lwc1 $f16,(0x04 * 17)(a0)
lwc1 $f17,(0x04 * 18)(a0)
lwc1 $f18,(0x04 * 19)(a0)
lwc1 $f19,(0x04 * 20)(a0)
lwc1 $f20,(0x04 * 21)(a0)
lwc1 $f21,(0x04 * 22)(a0)
lwc1 $f22,(0x04 * 23)(a0)
lwc1 $f23,(0x04 * 24)(a0)
lwc1 $f24,(0x04 * 25)(a0)
lwc1 $f25,(0x04 * 26)(a0)
lwc1 $f26,(0x04 * 27)(a0)
lwc1 $f27,(0x04 * 28)(a0)
lwc1 $f28,(0x04 * 29)(a0)
lwc1 $f29,(0x04 * 30)(a0)
lwc1 $f30,(0x04 * 31)(a0)
lwc1 $f31,(0x04 * 32)(a0)
ctc1 t0, CP1_STATUS ;/* restore fpp status reg */
nop
#endif
/* ͨ�üĴ��� */
/* ZERO */
lw $1, ( 1 * 4)(sp)
/* V0 */
lw $3, ( 3 * 4)(sp)
lw $4, ( 4 * 4)(sp)
lw $5, ( 5 * 4)(sp)
lw $6, ( 6 * 4)(sp)
lw $7, ( 7 * 4)(sp)
lw $8, ( 8 * 4)(sp)
lw $9, ( 9 * 4)(sp)
lw $10, (10 * 4)(sp)
lw $11, (11 * 4)(sp)
lw $12, (12 * 4)(sp)
lw $13, (13 * 4)(sp)
lw $14, (14 * 4)(sp)
lw $15, (15 * 4)(sp)
lw $16, (16 * 4)(sp)
lw $17, (17 * 4)(sp)
lw $18, (18 * 4)(sp)
lw $19, (19 * 4)(sp)
lw $20, (20 * 4)(sp)
lw $21, (21 * 4)(sp)
lw $22, (22 * 4)(sp)
lw $23, (23 * 4)(sp)
lw $24, (24 * 4)(sp)
lw $25, (25 * 4)(sp)
lw $26, (26 * 4)(sp)
lw $27, (27 * 4)(sp)
lw $28, (28 * 4)(sp)
/* SP */
lw $30, (30 * 4)(sp)
lw $31, (31 * 4)(sp)
/* STATUS CAUSE EPC.... */
lw $2, STK_OFFSET_HI(sp)
mthi $2
lw $2, STK_OFFSET_LO(sp)
mtlo $2
lw $2, STK_OFFSET_SR(sp)
mtc0 $2, CP0_STATUS
lw $2, STK_OFFSET_BADVADDR(sp)
mtc0 $2, CP0_BADVADDR
lw $2, STK_OFFSET_CAUSE(sp)
mtc0 $2, CP0_CAUSE
lw $2, STK_OFFSET_EPC(sp)
MTC0 $2, CP0_EPC
//restore $2
lw $2, ( 2 * 4)(sp)
//restore sp
lw $29, (29 * 4)(sp)
eret
nop
.set pop
.endm
#endif
#endif /* _MIPS_CONTEXT_ASM_H_ */
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