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135 lines
5.1 KiB
ArmAsm
135 lines
5.1 KiB
ArmAsm
;******************** (C) COPYRIGHT 2005 STMicroelectronics ********************
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;* File Name : 91x_vect.s
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;* Author : MCD Application Team
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;* Date First Issued : 10/25/2005 : Beta Version V0.1
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;* Description : This File used to initialize the exception and IRQ
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;* vectors, and to enter/return to/from exceptions
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;* handlers.
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;*******************************************************************************
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; History:
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; 10/25/2005 : Beta Version V0.1
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;*******************************************************************************
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; THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH
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; CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS
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; A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT
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; OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT
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; OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION
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; CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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;******************************************************************************/
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#include "FreeRTOSConfig.h"
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#include "ISR_Support.h"
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MODULE ?RESET
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COMMON INTVEC:CODE(2)
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CODE32
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EXPORT LINK
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VectorAddress EQU 0xFFFFF030 ; VIC Vector address register address.
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VectorAddressDaisy EQU 0xFC000030 ; Daisy VIC Vector address register
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; address.
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LINK EQU 0x0
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I_Bit EQU 0x80 ; when I bit is set, IRQ is disabled
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F_Bit EQU 0x40 ; when F bit is set, FIQ is disabled
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;*******************************************************************************
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; MACRO
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;*******************************************************************************
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;*******************************************************************************
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; Import the __program_start address from 91x_init.s
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;*******************************************************************************
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IMPORT __program_start
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;*******************************************************************************
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; Import exception handlers
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;*******************************************************************************
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IMPORT vPortYieldProcessor ; FreeRTOS SWI handler
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;*******************************************************************************
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; Export Peripherals IRQ handlers table address
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;*******************************************************************************
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;*******************************************************************************
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; Exception vectors
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;*******************************************************************************
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LDR PC, Reset_Addr
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LDR PC, Undefined_Addr
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LDR PC, SWI_Addr
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LDR PC, Prefetch_Addr
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LDR PC, Abort_Addr
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NOP ; Reserved vector
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LDR PC, IRQ_Addr
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LDR PC, FIQ_Addr
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;*******************************************************************************
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; Exception handlers address table
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;*******************************************************************************
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Reset_Addr DCD __program_start
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Undefined_Addr DCD UndefinedHandler
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SWI_Addr DCD vPortYieldProcessor
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Prefetch_Addr DCD PrefetchAbortHandler
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Abort_Addr DCD DataAbortHandler
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DCD 0 ; Reserved vector
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IRQ_Addr DCD IRQHandler
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FIQ_Addr DCD FIQHandler
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;*******************************************************************************
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; Exception Handlers
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;*******************************************************************************
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; - NOTE -
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; The IRQ and SWI handlers are the only managed exception.
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UndefinedHandler
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b UndefinedHandler
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PrefetchAbortHandler
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b PrefetchAbortHandler
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DataAbortHandler
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b DataAbortHandler
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FIQHandler
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b FIQHandler
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DefaultISR
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b DefaultISR
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;*******************************************************************************
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;* Function Name : IRQHandler
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;* Description : This function called when IRQ exception is entered.
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;* Input : none
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;* Output : none
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;*******************************************************************************
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IRQHandler
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portSAVE_CONTEXT ; Save the context of the current task.
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LDR r0, = VectorAddress
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LDR r0, [r0] ; Read the routine address
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LDR r1, = VectorAddressDaisy
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LDR r1, [r1]
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MOV lr, pc
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bx r0
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LDR r0, = VectorAddress ; Write to the VectorAddress to clear the
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STR r0, [r0] ; respective interrupt in the internal interrupt
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LDR r1, = VectorAddressDaisy ; Write to the VectorAddressDaisy to clear the
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STR r1,[r1] ; respective interrupt in the internal interrupt
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portRESTORE_CONTEXT ; Restore the context of the selected task.
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LTORG
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END
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;******************* (C) COPYRIGHT 2003 STMicroelectronics *****END OF FILE****
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