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2025-10-18 16:51:59 +08:00
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CMSIS_5-develop/CMSIS/RTOS2/RTX/Source/ARM/irq_armv6m.s Normal file
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;/*
; * Copyright (c) 2013-2023 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: ARMv6-M Exception handlers
; *
; * -----------------------------------------------------------------------------
; */
I_T_RUN_OFS EQU 20 ; osRtxInfo.thread.run offset
TCB_SP_OFS EQU 56 ; TCB.SP offset
TCB_ZONE_OFS EQU 68 ; TCB.zone offset
osRtxErrorStackOverflow\
EQU 1 ; Stack overflow
osRtxErrorSVC EQU 6 ; Invalid SVC function called
PRESERVE8
THUMB
AREA |.constdata|, DATA, READONLY
EXPORT irqRtxLib
irqRtxLib DCB 0 ; Non weak library reference
AREA |.text|, CODE, READONLY
SVC_Handler PROC
EXPORT SVC_Handler
IMPORT osRtxUserSVC
IMPORT osRtxInfo
IF :DEF:RTX_STACK_CHECK
IMPORT osRtxThreadStackCheck
IMPORT osRtxKernelErrorNotify
ENDIF
IF :DEF:RTX_SVC_PTR_CHECK
IMPORT |Image$$RTX_SVC_VENEERS$$Base|
IMPORT |Image$$RTX_SVC_VENEERS$$Length|
IMPORT osRtxKernelErrorNotify
ENDIF
IF :DEF:RTX_EXECUTION_ZONE
IMPORT osZoneSetup_Callback
ENDIF
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 ; Check SVC number
BNE SVC_User ; Branch if not SVC 0
IF :DEF:RTX_SVC_PTR_CHECK
SUBS R1,R7,#0x01 ; Clear T-bit of function address
LSLS R2,R1,#29 ; Check if 8-byte aligned
BEQ SVC_PtrBoundsCheck ; Branch if address is aligned
SVC_PtrInvalid
PUSH {R0,LR} ; Save SP and EXC_RETURN
MOVS R0,#osRtxErrorSVC ; Parameter: code
MOV R1,R7 ; Parameter: object_id
BL osRtxKernelErrorNotify ; Call osRtxKernelErrorNotify
POP {R2,R3} ; Restore SP and EXC_RETURN
MOV LR,R3 ; Set EXC_RETURN
B SVC_Context ; Branch to context handling
SVC_PtrBoundsCheck
LDR R2,=|Image$$RTX_SVC_VENEERS$$Base|
LDR R3,=|Image$$RTX_SVC_VENEERS$$Length|
SUBS R2,R1,R2 ; Subtract SVC table base address
CMP R2,R3 ; Compare with SVC table boundaries
BHS SVC_PtrInvalid ; Branch if address is out of bounds
ENDIF
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
STR R0,[R2] ; Store function return value
MOV LR,R3 ; Set EXC_RETURN
SVC_Context
LDR R3,=osRtxInfo+I_T_RUN_OFS; Load address of osRtxInfo.thread.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
SUBS R3,R3,#8 ; Adjust address
STR R2,[R3] ; osRtxInfo.thread.run: curr = next
CMP R1,#0
BEQ SVC_ContextRestore ; Branch if running thread is deleted
SVC_ContextSave
MRS R0,PSP ; Get PSP
SUBS R0,R0,#32 ; Calculate SP: space for R4..R11
STR R0,[R1,#TCB_SP_OFS] ; Store SP
IF :DEF:RTX_STACK_CHECK
PUSH {R1,R2} ; Save osRtxInfo.thread.run: curr & next
MOV R0,R1 ; Parameter: osRtxInfo.thread.run.curr
BL osRtxThreadStackCheck ; Check if thread stack is overrun
POP {R1,R2} ; Restore osRtxInfo.thread.run: curr & next
CMP R0,#0
BNE SVC_ContextSaveRegs ; Branch when stack check is ok
MOVS R0,#osRtxErrorStackOverflow ; Parameter: r0=code, r1=object_id
BL osRtxKernelErrorNotify ; Call osRtxKernelErrorNotify
LDR R3,=osRtxInfo+I_T_RUN_OFS ; Load address of osRtxInfo.thread.run
LDR R2,[R3,#4] ; Load osRtxInfo.thread.run: next
STR R2,[R3] ; osRtxInfo.thread.run: curr = next
MOVS R1,#0 ; Simulate deleted running thread
B SVC_ContextRestore ; Branch to context restore handling
SVC_ContextSaveRegs
LDR R0,[R1,#TCB_SP_OFS] ; Load SP
ENDIF
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_ContextRestore
MOVS R4,R2 ; Assign osRtxInfo.thread.run.next to R4
IF :DEF:RTX_EXECUTION_ZONE
MOVS R3,#TCB_ZONE_OFS ; Get TCB.zone offset
LDRB R0,[R2,R3] ; Load osRtxInfo.thread.run.next: zone
CMP R1,#0
BEQ SVC_ZoneSetup ; Branch if running thread is deleted
LDRB R1,[R1,R3] ; Load osRtxInfo.thread.run.curr: zone
CMP R0,R1 ; Check if next:zone == curr:zone
BEQ SVC_ContextRestore_N ; Branch if zone has not changed
SVC_ZoneSetup
BL osZoneSetup_Callback ; Setup zone for next thread
ENDIF
SVC_ContextRestore_N
LDR R0,[R4,#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,#2 ; Binary complement of 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
BX R3 ; Return from handler
ALIGN
ENDP
PendSV_Handler PROC
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 ; Branch to context handling
ALIGN
ENDP
SysTick_Handler PROC
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 ; Branch to context handling
ALIGN
ENDP
IF :DEF:RTX_SAFETY_FEATURES
osFaultResume PROC
EXPORT osFaultResume
B SVC_Context ; Branch to context handling
ALIGN
ENDP
ENDIF
END