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;/*
; * Copyright (c) 2016-2020 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: ARMv8M Mainline Exception handlers
; *
; * -----------------------------------------------------------------------------
; */
#ifndef DOMAIN_NS
#define DOMAIN_NS 0
#endif
#ifdef __ARMVFP__
FPU_USED EQU 1
#else
FPU_USED EQU 0
#endif
#if (defined(__ARM_FEATURE_MVE) && (__ARM_FEATURE_MVE > 0))
MVE_USED EQU 1
#else
MVE_USED EQU 0
#endif
I_T_RUN_OFS EQU 20 ; osRtxInfo.thread.run offset
TCB_SM_OFS EQU 48 ; TCB.stack_mem offset
TCB_SP_OFS EQU 56 ; TCB.SP offset
TCB_SF_OFS EQU 34 ; TCB.stack_frame offset
TCB_TZM_OFS EQU 64 ; TCB.tz_memory offset
PRESERVE8
SECTION .rodata:DATA:NOROOT(2)
EXPORT irqRtxLib
irqRtxLib DCB 0 ; Non weak library reference
SECTION .text:CODE:NOROOT(2)
THUMB
SVC_Handler
EXPORT SVC_Handler
IMPORT osRtxUserSVC
IMPORT osRtxInfo
#if (DOMAIN_NS == 1)
IMPORT TZ_LoadContext_S
IMPORT TZ_StoreContext_S
#endif
TST LR,#0x04 ; Determine return stack from EXC_RETURN bit 2
ITE EQ
MRSEQ R0,MSP ; Get MSP if return stack is MSP
MRSNE R0,PSP ; Get PSP if return stack is PSP
LDR R1,[R0,#24] ; Load saved PC from stack
LDRB R1,[R1,#-2] ; Load SVC number
CMP R1,#0
BNE SVC_User ; Branch if not SVC 0
PUSH {R0,LR} ; Save SP and EXC_RETURN
LDM R0,{R0-R3,R12} ; Load function parameters and address from stack
BLX R12 ; Call service function
POP {R12,LR} ; Restore SP and EXC_RETURN
STM R12,{R0-R1} ; Store function return values
SVC_Context
LDR R3,=osRtxInfo+I_T_RUN_OFS; Load address of osRtxInfo.run
LDM R3,{R1,R2} ; Load osRtxInfo.thread.run: curr & next
CMP R1,R2 ; Check if thread switch is required
IT EQ
BXEQ LR ; Exit when threads are the same
#if ((FPU_USED == 1) || (MVE_USED == 1))
CBNZ R1,SVC_ContextSave ; Branch if running thread is not deleted
TST LR,#0x10 ; Check if extended stack frame
BNE SVC_ContextSwitch
LDR R1,=0xE000EF34 ; FPCCR Address
LDR R0,[R1] ; Load FPCCR
BIC R0,R0,#1 ; Clear LSPACT (Lazy state)
STR R0,[R1] ; Store FPCCR
B SVC_ContextSwitch
#else
CBZ R1,SVC_ContextSwitch ; Branch if running thread is deleted
#endif
SVC_ContextSave
#if (DOMAIN_NS == 1)
LDR R0,[R1,#TCB_TZM_OFS] ; Load TrustZone memory identifier
CBZ R0,SVC_ContextSave1 ; Branch if there is no secure context
PUSH {R1,R2,R3,LR} ; Save registers and EXC_RETURN
BL TZ_StoreContext_S ; Store secure context
POP {R1,R2,R3,LR} ; Restore registers and EXC_RETURN
#endif
SVC_ContextSave1
MRS R0,PSP ; Get PSP
STMDB R0!,{R4-R11} ; Save R4..R11
#if ((FPU_USED == 1) || (MVE_USED == 1))
TST LR,#0x10 ; Check if extended stack frame
IT EQ
VSTMDBEQ R0!,{S16-S31} ; Save VFP S16.S31
#endif
SVC_ContextSave2
STR R0,[R1,#TCB_SP_OFS] ; Store SP
STRB LR,[R1,#TCB_SF_OFS] ; Store stack frame information
SVC_ContextSwitch
STR R2,[R3] ; osRtxInfo.thread.run: curr = next
SVC_ContextRestore
#if (DOMAIN_NS == 1)
LDR R0,[R2,#TCB_TZM_OFS] ; Load TrustZone memory identifier
CBZ R0,SVC_ContextRestore1 ; Branch if there is no secure context
PUSH {R2,R3} ; Save registers
BL TZ_LoadContext_S ; Load secure context
POP {R2,R3} ; Restore registers
#endif
SVC_ContextRestore1
LDR R0,[R2,#TCB_SM_OFS] ; Load stack memory base
LDRB R1,[R2,#TCB_SF_OFS] ; Load stack frame information
MSR PSPLIM,R0 ; Set PSPLIM
LDR R0,[R2,#TCB_SP_OFS] ; Load SP
ORR LR,R1,#0xFFFFFF00 ; Set EXC_RETURN
#if (DOMAIN_NS == 1)
TST LR,#0x40 ; Check domain of interrupted thread
BNE SVC_ContextRestore2 ; Branch if secure
#endif
#if ((FPU_USED == 1) || (MVE_USED == 1))
TST LR,#0x10 ; Check if extended stack frame
IT EQ
VLDMIAEQ R0!,{S16-S31} ; Restore VFP S16..S31
#endif
LDMIA R0!,{R4-R11} ; Restore R4..R11
SVC_ContextRestore2
MSR PSP,R0 ; Set PSP
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
LDR R12,[R2,R1,LSL #2] ; Load address of SVC function
LDM R0,{R0-R3} ; Load function parameters from stack
BLX R12 ; Call service function
POP {R12,LR} ; Restore SP and EXC_RETURN
STR R0,[R12] ; Store function return value
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,LR} ; Restore EXC_RETURN
B Sys_Context
SysTick_Handler
EXPORT SysTick_Handler
IMPORT osRtxTick_Handler
PUSH {R0,LR} ; Save EXC_RETURN
BL osRtxTick_Handler ; Call osRtxTick_Handler
POP {R0,LR} ; Restore EXC_RETURN
B Sys_Context
Sys_Context
EXPORT Sys_Context
IMPORT osRtxInfo
#if (DOMAIN_NS == 1)
IMPORT TZ_LoadContext_S
IMPORT TZ_StoreContext_S
#endif
LDR R3,=osRtxInfo+I_T_RUN_OFS; Load address of osRtxInfo.run
LDM R3,{R1,R2} ; Load osRtxInfo.thread.run: curr & next
CMP R1,R2 ; Check if thread switch is required
IT EQ
BXEQ LR ; Exit when threads are the same
Sys_ContextSave
#if (DOMAIN_NS == 1)
LDR R0,[R1,#TCB_TZM_OFS] ; Load TrustZone memory identifier
CBZ R0,Sys_ContextSave1 ; Branch if there is no secure context
PUSH {R1,R2,R3,LR} ; Save registers and EXC_RETURN
BL TZ_StoreContext_S ; Store secure context
POP {R1,R2,R3,LR} ; Restore registers and EXC_RETURN
Sys_ContextSave1
TST LR,#0x40 ; Check domain of interrupted thread
IT NE
MRSNE R0,PSP ; Get PSP
BNE Sys_ContextSave3 ; Branch if secure
#endif
Sys_ContextSave2
MRS R0,PSP ; Get PSP
STMDB R0!,{R4-R11} ; Save R4..R11
#if ((FPU_USED == 1) || (MVE_USED == 1))
TST LR,#0x10 ; Check if extended stack frame
IT EQ
VSTMDBEQ R0!,{S16-S31} ; Save VFP S16.S31
#endif
Sys_ContextSave3
STR R0,[R1,#TCB_SP_OFS] ; Store SP
STRB LR,[R1,#TCB_SF_OFS] ; Store stack frame information
Sys_ContextSwitch
STR R2,[R3] ; osRtxInfo.run: curr = next
Sys_ContextRestore
#if (DOMAIN_NS == 1)
LDR R0,[R2,#TCB_TZM_OFS] ; Load TrustZone memory identifier
CBZ R0,Sys_ContextRestore1 ; Branch if there is no secure context
PUSH {R2,R3} ; Save registers
BL TZ_LoadContext_S ; Load secure context
POP {R2,R3} ; Restore registers
#endif
Sys_ContextRestore1
LDR R0,[R2,#TCB_SM_OFS] ; Load stack memory base
LDRB R1,[R2,#TCB_SF_OFS] ; Load stack frame information
MSR PSPLIM,R0 ; Set PSPLIM
LDR R0,[R2,#TCB_SP_OFS] ; Load SP
ORR LR,R1,#0xFFFFFF00 ; Set EXC_RETURN
#if (DOMAIN_NS == 1)
TST LR,#0x40 ; Check domain of interrupted thread
BNE Sys_ContextRestore2 ; Branch if secure
#endif
#if ((FPU_USED == 1) || (MVE_USED == 1))
TST LR,#0x10 ; Check if extended stack frame
IT EQ
VLDMIAEQ R0!,{S16-S31} ; Restore VFP S16..S31
#endif
LDMIA R0!,{R4-R11} ; Restore R4..R11
Sys_ContextRestore2
MSR PSP,R0 ; Set PSP
Sys_ContextExit
BX LR ; Exit from handler
END