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Add user call back function for SVC Handler

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kar-rahul-aws 2024-07-10 23:44:08 +05:30
parent 9e1b7c6c81
commit 5652423c66
1 changed files with 47 additions and 14 deletions
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61
portable/GCC/ARM_CRx_No_GIC/portASM.S
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@ -28,6 +28,7 @@
.text
.arm
.syntax unified
.set SYS_MODE, 0x1f
.set SVC_MODE, 0x13
@ -53,6 +54,7 @@
.global vPortDisableInterrupts
.global ulPortSetInterruptMaskFromISR
.weak vApplicationSVCHandler
/*-----------------------------------------------------------*/
.macro portSAVE_CONTEXT
@ -132,20 +134,6 @@
/*-----------------------------------------------------------*/
/*
* SVC handler is used to yield.
*/
.align 4
.type FreeRTOS_SVC_Handler, %function
FreeRTOS_SVC_Handler:
/* Save the context of the current task and select a new task to run. */
portSAVE_CONTEXT
BLX vTaskSwitchContext
portRESTORE_CONTEXT
/*-----------------------------------------------------------*/
/*
* void vPortRestoreTaskContext( void );
*
@ -238,6 +226,51 @@ ulPortSetInterruptMaskFromISR:
/*-----------------------------------------------------------*/
/*
* void vApplicationSVCHandler( uint32_t ulSvcNumber );
*/
.align 4
.type vApplicationSVCHandler, %function
vApplicationSVCHandler:
B vApplicationSVCHandler
/*-----------------------------------------------------------*/
/*
* SVC handler is used to yield.
*/
.align 4
.type FreeRTOS_SVC_Handler, %function
FreeRTOS_SVC_Handler:
PUSH { R0-R1 }
/* ---------------------------- Get Caller SVC Number ---------------------------- */
MRS R0, SPSR /* R0 = CPSR at the time of SVC. */
TST R0, #0x20 /* Check Thumb bit (5) in CPSR. */
LDRHNE R0, [LR, #-0x2] /* If Thumb, load halfword. */
BICNE R0, R0, #0xFF00 /* And extract immidiate field (i.e. SVC number). */
LDREQ R0, [LR, #-0x4] /* If ARM, load word. */
BICEQ R0, R0, #0xFF000000 /* And extract immidiate field (i.e. SVC number). */
/* --------------------------------- SVC Routing --------------------------------- */
CMP R0, #0
BEQ svcPortYield
BNE svcApplicationCall
svcPortYield:
POP { R0-R1 }
portSAVE_CONTEXT
BLX vTaskSwitchContext
portRESTORE_CONTEXT
svcApplicationCall:
POP { R0-R1 }
portSAVE_CONTEXT
BLX vApplicationSVCHandler
portRESTORE_CONTEXT
/*-----------------------------------------------------------*/
.align 4
.type FreeRTOS_IRQ_Handler, %function
FreeRTOS_IRQ_Handler: