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CMSIS_5-develop/CMSIS/RTOS/RTX/SRC/IAR/HAL_CM3.s Normal file
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/*----------------------------------------------------------------------------
* CMSIS-RTOS - RTX
*----------------------------------------------------------------------------
* Name: HAL_CM3.S
* Purpose: Hardware Abstraction Layer for Cortex-M3
* Rev.: V4.70
*----------------------------------------------------------------------------
*
* Copyright (c) 1999-2009 KEIL, 2009-2017 ARM Germany GmbH. 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.
*---------------------------------------------------------------------------*/
NAME HAL_CM3.S
#define TCB_TSTACK 40
EXTERN os_flags
EXTERN os_tsk
EXTERN rt_alloc_box
EXTERN rt_free_box
EXTERN rt_stk_check
EXTERN rt_pop_req
EXTERN rt_systick
EXTERN os_tick_irqack
EXTERN SVC_Table
EXTERN SVC_Count
/*----------------------------------------------------------------------------
* Functions
*---------------------------------------------------------------------------*/
SECTION .text:CODE:NOROOT(2)
THUMB
/*--------------------------- rt_set_PSP ------------------------------------*/
; void rt_set_PSP (U32 stack);
PUBLIC rt_set_PSP
rt_set_PSP:
MSR PSP,R0
BX LR
/*--------------------------- rt_get_PSP ------------------------------------*/
; U32 rt_get_PSP (void);
PUBLIC rt_get_PSP
rt_get_PSP:
MRS R0,PSP
BX LR
/*--------------------------- os_set_env ------------------------------------*/
; void os_set_env (void);
/* Switch to Unprivileged/Privileged Thread mode, use PSP. */
PUBLIC os_set_env
os_set_env:
MOV R0,SP /* PSP = MSP */
MSR PSP,R0
LDR R0,=os_flags
LDRB R0,[R0]
LSLS R0,#31
ITE NE
MOVNE R0,#0x02 /* Privileged Thread mode, use PSP */
MOVEQ R0,#0x03 /* Unprivileged Thread mode, use PSP */
MSR CONTROL,R0
BX LR
/*--------------------------- _alloc_box ------------------------------------*/
; void *_alloc_box (void *box_mem);
/* Function wrapper for Unprivileged/Privileged mode. */
PUBLIC _alloc_box
_alloc_box:
LDR R12,=rt_alloc_box
MRS R3,IPSR
LSLS R3,#24
IT NE
BXNE R12
MRS R3,CONTROL
LSLS R3,#31
IT EQ
BXEQ R12
SVC 0
BX LR
/*--------------------------- _free_box -------------------------------------*/
; U32 _free_box (void *box_mem, void *box);
/* Function wrapper for Unprivileged/Privileged mode. */
PUBLIC _free_box
_free_box:
LDR R12,=rt_free_box
MRS R3,IPSR
LSLS R3,#24
IT NE
BXNE R12
MRS R3,CONTROL
LSLS R3,#31
IT EQ
BXEQ R12
SVC 0
BX LR
/*-------------------------- SVC_Handler ------------------------------------*/
; void SVC_Handler (void);
PUBLIC SVC_Handler
SVC_Handler:
MRS R0,PSP /* Read PSP */
LDR R1,[R0,#24] /* Read Saved PC from Stack */
LDRB R1,[R1,#-2] /* Load SVC Number */
CBNZ R1,SVC_User
LDM R0,{R0-R3,R12} /* Read R0-R3,R12 from stack */
BLX R12 /* Call SVC Function */
MRS R12,PSP /* Read PSP */
STM R12,{R0-R2} /* Store return values */
LDR R3,=os_tsk
LDM R3,{R1,R2} /* os_tsk.run, os_tsk.next */
CMP R1,R2
BEQ SVC_Exit /* no task switch */
CBZ R1,SVC_Next /* Runtask deleted? */
STMDB R12!,{R4-R11} /* Save Old context */
STR R12,[R1,#TCB_TSTACK] /* Update os_tsk.run->tsk_stack */
PUSH {R2,R3}
BL rt_stk_check /* Check for Stack overflow */
POP {R2,R3}
SVC_Next:
STR R2,[R3] /* os_tsk.run = os_tsk.next */
LDR R12,[R2,#TCB_TSTACK] /* os_tsk.next->tsk_stack */
LDMIA R12!,{R4-R11} /* Restore New Context */
MSR PSP,R12 /* Write PSP */
SVC_Exit:
MVN LR,#~0xFFFFFFFD /* set EXC_RETURN value */
BX LR
/*------------------- User SVC ------------------------------*/
SVC_User:
PUSH {R4,LR} /* Save Registers */
LDR R2,=SVC_Count
LDR R2,[R2]
CMP R1,R2
BHI SVC_Done /* Overflow */
LDR R4,=SVC_Table-4
LDR R4,[R4,R1,LSL #2] /* Load SVC Function Address */
LDM R0,{R0-R3,R12} /* Read R0-R3,R12 from stack */
BLX R4 /* Call SVC Function */
MRS R12,PSP
STM R12,{R0-R3} /* Function return values */
SVC_Done:
POP {R4,PC} /* RETI */
/*-------------------------- PendSV_Handler ---------------------------------*/
; void PendSV_Handler (void);
PUBLIC PendSV_Handler
PendSV_Handler:
BL rt_pop_req
Sys_Switch:
LDR R3,=os_tsk
LDM R3,{R1,R2} /* os_tsk.run, os_tsk.next */
CMP R1,R2
BEQ Sys_Exit
MRS R12,PSP /* Read PSP */
STMDB R12!,{R4-R11} /* Save Old context */
STR R12,[R1,#TCB_TSTACK] /* Update os_tsk.run->tsk_stack */
PUSH {R2,R3}
BL rt_stk_check /* Check for Stack overflow */
POP {R2,R3}
STR R2,[R3] /* os_tsk.run = os_tsk.next */
LDR R12,[R2,#TCB_TSTACK] /* os_tsk.next->tsk_stack */
LDMIA R12!,{R4-R11} /* Restore New Context */
MSR PSP,R12 /* Write PSP */
Sys_Exit:
MVN LR,#~0xFFFFFFFD /* set EXC_RETURN value */
BX LR /* Return to Thread Mode */
/*-------------------------- SysTick_Handler --------------------------------*/
; void SysTick_Handler (void);
PUBLIC SysTick_Handler
SysTick_Handler:
BL rt_systick
B Sys_Switch
/*-------------------------- OS_Tick_Handler --------------------------------*/
; void OS_Tick_Handler (void);
PUBLIC OS_Tick_Handler
OS_Tick_Handler:
BL os_tick_irqack
BL rt_systick
B Sys_Switch
END
/*----------------------------------------------------------------------------
* end of file
*---------------------------------------------------------------------------*/