159 lines
6.2 KiB
ArmAsm
159 lines
6.2 KiB
ArmAsm
;/*
|
|
; * Copyright (c) 2013-2018 Arm Limited. All rights reserved.
|
|
; *
|
|
; * SPDX-License-Identifier: Apache-2.0
|
|
; *
|
|
; * Licensed under the Apache License, Version 2.0 (the License); you may
|
|
; * not use this file except in compliance with the License.
|
|
; * You may obtain a copy of the License at
|
|
; *
|
|
; * www.apache.org/licenses/LICENSE-2.0
|
|
; *
|
|
; * Unless required by applicable law or agreed to in writing, software
|
|
; * distributed under the License is distributed on an AS IS BASIS, WITHOUT
|
|
; * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
; * See the License for the specific language governing permissions and
|
|
; * limitations under the License.
|
|
; *
|
|
; * -----------------------------------------------------------------------------
|
|
; *
|
|
; * Project: CMSIS-RTOS RTX
|
|
; * Title: Cortex-M0 Exception handlers
|
|
; *
|
|
; * -----------------------------------------------------------------------------
|
|
; */
|
|
|
|
|
|
NAME irq_cm0.s
|
|
|
|
|
|
I_T_RUN_OFS EQU 20 ; osRtxInfo.thread.run offset
|
|
TCB_SP_OFS EQU 56 ; TCB.SP offset
|
|
|
|
|
|
PRESERVE8
|
|
SECTION .rodata:DATA:NOROOT(2)
|
|
|
|
|
|
EXPORT irqRtxLib
|
|
irqRtxLib DCB 0 ; Non weak library reference
|
|
|
|
|
|
THUMB
|
|
SECTION .text:CODE:NOROOT(2)
|
|
|
|
|
|
SVC_Handler
|
|
EXPORT SVC_Handler
|
|
IMPORT osRtxUserSVC
|
|
IMPORT osRtxInfo
|
|
|
|
MOV R0,LR
|
|
LSRS R0,R0,#3 ; Determine return stack from EXC_RETURN bit 2
|
|
BCC SVC_MSP ; Branch if return stack is MSP
|
|
MRS R0,PSP ; Get PSP
|
|
|
|
SVC_Number
|
|
LDR R1,[R0,#24] ; Load saved PC from stack
|
|
SUBS R1,R1,#2 ; Point to SVC instruction
|
|
LDRB R1,[R1] ; Load SVC number
|
|
CMP R1,#0
|
|
BNE SVC_User ; Branch if not SVC 0
|
|
|
|
PUSH {R0,LR} ; Save SP and EXC_RETURN
|
|
LDMIA R0,{R0-R3} ; Load function parameters from stack
|
|
BLX R7 ; Call service function
|
|
POP {R2,R3} ; Restore SP and EXC_RETURN
|
|
STMIA R2!,{R0-R1} ; Store function return values
|
|
MOV LR,R3 ; Set EXC_RETURN
|
|
|
|
SVC_Context
|
|
LDR R3,=osRtxInfo+I_T_RUN_OFS; Load address of osRtxInfo.run
|
|
LDMIA R3!,{R1,R2} ; Load osRtxInfo.thread.run: curr & next
|
|
CMP R1,R2 ; Check if thread switch is required
|
|
BEQ SVC_Exit ; Branch when threads are the same
|
|
|
|
CMP R1,#0
|
|
BEQ SVC_ContextSwitch ; Branch if running thread is deleted
|
|
|
|
SVC_ContextSave
|
|
MRS R0,PSP ; Get PSP
|
|
SUBS R0,R0,#32 ; Calculate SP
|
|
STR R0,[R1,#TCB_SP_OFS] ; Store SP
|
|
STMIA R0!,{R4-R7} ; Save R4..R7
|
|
MOV R4,R8
|
|
MOV R5,R9
|
|
MOV R6,R10
|
|
MOV R7,R11
|
|
STMIA R0!,{R4-R7} ; Save R8..R11
|
|
|
|
SVC_ContextSwitch
|
|
SUBS R3,R3,#8 ; Adjust address
|
|
STR R2,[R3] ; osRtxInfo.thread.run: curr = next
|
|
|
|
SVC_ContextRestore
|
|
LDR R0,[R2,#TCB_SP_OFS] ; Load SP
|
|
ADDS R0,R0,#16 ; Adjust address
|
|
LDMIA R0!,{R4-R7} ; Restore R8..R11
|
|
MOV R8,R4
|
|
MOV R9,R5
|
|
MOV R10,R6
|
|
MOV R11,R7
|
|
MSR PSP,R0 ; Set PSP
|
|
SUBS R0,R0,#32 ; Adjust address
|
|
LDMIA R0!,{R4-R7} ; Restore R4..R7
|
|
|
|
MOVS R0,#~0xFFFFFFFD
|
|
MVNS R0,R0 ; Set EXC_RETURN value
|
|
BX R0 ; Exit from handler
|
|
|
|
SVC_MSP
|
|
MRS R0,MSP ; Get MSP
|
|
B SVC_Number
|
|
|
|
SVC_Exit
|
|
BX LR ; Exit from handler
|
|
|
|
SVC_User
|
|
LDR R2,=osRtxUserSVC ; Load address of SVC table
|
|
LDR R3,[R2] ; Load SVC maximum number
|
|
CMP R1,R3 ; Check SVC number range
|
|
BHI SVC_Exit ; Branch if out of range
|
|
|
|
PUSH {R0,LR} ; Save SP and EXC_RETURN
|
|
LSLS R1,R1,#2
|
|
LDR R3,[R2,R1] ; Load address of SVC function
|
|
MOV R12,R3
|
|
LDMIA R0,{R0-R3} ; Load function parameters from stack
|
|
BLX R12 ; Call service function
|
|
POP {R2,R3} ; Restore SP and EXC_RETURN
|
|
STR R0,[R2] ; Store function return value
|
|
MOV LR,R3 ; Set EXC_RETURN
|
|
|
|
BX LR ; Return from handler
|
|
|
|
|
|
PendSV_Handler
|
|
EXPORT PendSV_Handler
|
|
IMPORT osRtxPendSV_Handler
|
|
|
|
PUSH {R0,LR} ; Save EXC_RETURN
|
|
BL osRtxPendSV_Handler ; Call osRtxPendSV_Handler
|
|
POP {R0,R1} ; Restore EXC_RETURN
|
|
MOV LR,R1 ; Set EXC_RETURN
|
|
B SVC_Context
|
|
|
|
|
|
SysTick_Handler
|
|
EXPORT SysTick_Handler
|
|
IMPORT osRtxTick_Handler
|
|
|
|
PUSH {R0,LR} ; Save EXC_RETURN
|
|
BL osRtxTick_Handler ; Call osRtxTick_Handler
|
|
POP {R0,R1} ; Restore EXC_RETURN
|
|
MOV LR,R1 ; Set EXC_RETURN
|
|
B SVC_Context
|
|
|
|
|
|
END
|