rt-thread/libcpu/mips/x1000/mips_excpt_gcc.S

103 lines
3.2 KiB
ArmAsm

/*
* File : mips_excpt_asm.S
* 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
* 201697 Urey the first version
*/
#ifndef __ASSEMBLY__
# define __ASSEMBLY__
#endif
#include "../common/mips.h"
#define _EXC_STKSIZE 20*1024
;/*********************************************************************************************************
; PTE BASE 相关定义
;*********************************************************************************************************/
#define PTE_BASE_OFFSET 23
#define PTE_BASE_SIZE 9
#define MIPS32_BADVPN2_SHIFT 2
.section ".text", "ax"
.set noreorder
LEAF(mips_tlb_refill_handlerx)
.set push
.set noat
.set noreorder
.set volatile
;/*
; * K1 = CP0_CTXT
; * K0 = K1
; */
mfc0 k1 , CP0_CONTEXT ;/* K1 等于 Context 寄存器 */
ehb
move k0 , k1 ;/* K0 等于 Context 寄存器 */
;/*
; * K1 <<= PTE_BASE_SIZE
; * K1 >>= PTE_BASE_SIZE
; * K1 >>= 4
; * K1 >>= MIPS32_BADVPN2_SHIFT
; * K1 <<= 3
; */
sll k1 , PTE_BASE_SIZE
srl k1 , (PTE_BASE_SIZE + 4 + MIPS32_BADVPN2_SHIFT) ;/* K1 为 BAD VPN2 */
sll k1 , (4 - 1)
;/*
; * K0 >>= PTE_BASE_OFFSET
; * K0 <<= PTE_BASE_OFFSET
; */
srl k0 , PTE_BASE_OFFSET
sll k0 , PTE_BASE_OFFSET ;/* K0 为 PTE BASE */
;/*
; * K1 = K1 | K0
; */
or k1 , k1 , k0 ;/* 合成 */
;/*
; * K0 = *K1
; * K1 = *(K1 + 4)
; */
lw k0 , 0(k1)
lw k1 , 4(k1)
;/*
; * CP0_TLBLO0 = K0
; * CP0_TLBLO1 = K1
; */
mtc0 k0 , CP0_ENTRYLO0 ;/* EntryLo0 */
mtc0 k1 , CP0_ENTRYLO1 ;/* EntryLo1 */
ehb
tlbwr ;/* TLB 随机替换 */
eret ;/* 异常返回 */
.set pop
END(mips_tlb_refill_handlerx)