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;******************** (C) COPYRIGHT 2006 STMicroelectronics ********************
;* File Name : 91x_vect.s
;* Author : MCD Application Team
;* Date First Issued : 05/18/2006 : Version 1.0
;* Description : This File used to initialize the exception and IRQ
;* vectors, and to enter/return to/from exceptions
;* handlers.
;*******************************************************************************
* History:
* 05/22/2007 : Version 1.2
* 05/24/2006 : Version 1.1
* 05/18/2006 : Version 1.0
;*******************************************************************************
; THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH
; CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS
; A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT
; OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT
; OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION
; CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
;******************************************************************************/
#include "FreeRTOSConfig.h"
#include "ISR_Support.h"
SECTION .intvec:CODE:ROOT(2)
CODE32
VectorAddress EQU 0xFFFFF030 ; VIC Vector address register address.
VectorAddressDaisy EQU 0xFC000030 ; Daisy VIC Vector address register
I_Bit EQU 0x80 ; when I bit is set, IRQ is disabled
F_Bit EQU 0x40 ; when F bit is set, FIQ is disabled
;*******************************************************************************
; Import the __iar_program_start address from 91x_init.s
;*******************************************************************************
IMPORT __iar_program_start
;*******************************************************************************
; Import exception handlers
;*******************************************************************************
IMPORT Undefined_Handler
IMPORT vPortYieldProcessor ; FreeRTOS SWI handler
IMPORT Prefetch_Handler
IMPORT Abort_Handler
IMPORT FIQ_Handler
;*******************************************************************************
; Export Peripherals IRQ handlers table address
;*******************************************************************************
;*******************************************************************************
; Exception vectors
;*******************************************************************************
LDR PC, Reset_Addr
LDR PC, Undefined_Addr
LDR PC, SWI_Addr
LDR PC, Prefetch_Addr
LDR PC, Abort_Addr
NOP ; Reserved vector
LDR PC, IRQ_Addr
;*******************************************************************************
;* Function Name : FIQHandler
;* Description : This function is called when FIQ exception is entered.
;* Input : none
;* Output : none
;*******************************************************************************
FIQHandler
SUB lr,lr,#4 ; Update the link register.
STMFD sp!,{r0-r7,lr} ; Save The workspace plus the current return
; address lr_fiq into the FIQ stack.
ldr r0,=FIQ_Handler
ldr lr,=FIQ_Handler_end
bx r0 ;Branch to FIQ_Handler.
FIQ_Handler_end:
LDMFD sp!,{r0-r7,pc}^; Return to the instruction following...
; ...the exception interrupt.
;*******************************************************************************
; Exception handlers address table
;*******************************************************************************
Reset_Addr DCD __iar_program_start
Undefined_Addr DCD UndefinedHandler
SWI_Addr DCD vPortYieldProcessor
Prefetch_Addr DCD PrefetchAbortHandler
Abort_Addr DCD DataAbortHandler
DCD 0 ; Reserved vector
IRQ_Addr DCD IRQHandler
;*******************************************************************************
; MACRO
;*******************************************************************************
;*******************************************************************************
;* Macro Name : SaveContext
;* Description : This macro is used to save the context before entering
; an exception handler.
;* Input : The range of registers to store.
;* Output : none
;*******************************************************************************
SaveContext MACRO reg1,reg2
STMFD sp!,{reg1-reg2,lr} ; Save The workspace plus the current return
; address lr_ mode into the stack.
MRS r1,spsr ; Save the spsr_mode into r1.
STMFD sp!,{r1} ; Save spsr.
ENDM
;*******************************************************************************
;* Macro Name : RestoreContext
;* Description : This macro is used to restore the context to return from
; an exception handler and continue the program execution.
;* Input : The range of registers to restore.
;* Output : none
;*******************************************************************************
RestoreContext MACRO reg1,reg2
LDMFD sp!,{r1} ; Restore the saved spsr_mode into r1.
MSR spsr_cxsf,r1 ; Restore spsr_mode.
LDMFD sp!,{reg1-reg2,pc}^; Return to the instruction following...
; ...the exception interrupt.
ENDM
;*******************************************************************************
; Exception Handlers
;*******************************************************************************
;*******************************************************************************
;* Function Name : UndefinedHandler
;* Description : This function is called when undefined instruction
; exception is entered.
;* Input : none
;* Output : none
;*******************************************************************************
UndefinedHandler
SaveContext r0,r12 ; Save the workspace plus the current
; return address lr_ und and spsr_und.
ldr r0,=Undefined_Handler
ldr lr,=Undefined_Handler_end
bx r0 ; Branch to Undefined_Handler.
Undefined_Handler_end:
RestoreContext r0,r12 ; Return to the instruction following...
; ...the undefined instruction.
;*******************************************************************************
;* Function Name : PrefetchAbortHandler
;* Description : This function is called when Prefetch Abort
; exception is entered.
;* Input : none
;* Output : none
;*******************************************************************************
PrefetchAbortHandler
SUB lr,lr,#4 ; Update the link register.
SaveContext r0,r12 ; Save the workspace plus the current
; return address lr_abt and spsr_abt.
ldr r0,=Prefetch_Handler
ldr lr,=Prefetch_Handler_end
bx r0 ; Branch to Prefetch_Handler.
Prefetch_Handler_end:
RestoreContext r0,r12 ; Return to the instruction following that...
; ...has generated the prefetch abort exception.
;*******************************************************************************
;* Function Name : DataAbortHandler
;* Description : This function is called when Data Abort
; exception is entered.
;* Input : none
;* Output : none
;*******************************************************************************
DataAbortHandler
SUB lr,lr,#8 ; Update the link register.
SaveContext r0,r12 ; Save the workspace plus the current
; return address lr_ abt and spsr_abt.
ldr r0,=Abort_Handler
ldr lr,=Abort_Handler_end
bx r0 ; Branch to Abort_Handler.
Abort_Handler_end:
RestoreContext r0,r12 ; Return to the instruction following that...
; ...has generated the data abort exception.
;*******************************************************************************
;* Function Name : IRQHandler
;* Description : This function is called when IRQ exception is entered.
;* Input : none
;* Output : none
;*******************************************************************************
IRQHandler
portSAVE_CONTEXT ; Save the context of the current task.
LDR r0, = VectorAddress
LDR r0, [r0] ; Read the routine address
LDR r1, = VectorAddressDaisy
LDR r1, [r1]
MOV lr, pc
bx r0
LDR r0, = VectorAddress ; Write to the VectorAddress to clear the
STR r0, [r0] ; respective interrupt in the internal interrupt
LDR r1, = VectorAddressDaisy ; Write to the VectorAddressDaisy to clear the
STR r1,[r1] ; respective interrupt in the internal interrupt
portRESTORE_CONTEXT ; Restore the context of the selected task.
LTORG
END
;******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****