?? 71x_vect.s
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;******************** (C) COPYRIGHT 2003 STMicroelectronics ********************
;* File Name : 71x_vect.s
;* Author : MCD Application Team
;* Date First Issued : 16/05/2003
;* Description : This file used to initialize the exception and IRQ
;* vectors, and to enter/return to/from exceptions handlers.
;*******************************************************************************
;* History:
;* 16/05/03 : Creation.
;*******************************************************************************
AREA Vect, CODE, READONLY
EIC_base_addr EQU 0xFFFFF800; EIC base address.
CICR_off_addr EQU 0x04 ; Current Interrupt Channel Register.
IVR_off_addr EQU 0x18 ; Interrupt Vector Register.
IPR_off_addr EQU 0x40 ; Interrupt Pending Register.
ENTRY
;*******************************************************************************
; Import the Reset_Handler address from 71x_init.s
;*******************************************************************************
IMPORT Reset_Handler
;*******************************************************************************
; Import exception handlers
;*******************************************************************************
IMPORT Undefined_Handler
IMPORT SWI_Handler
IMPORT Prefetch_Handler
IMPORT Abort_Handler
IMPORT FIQ_Handler
;*******************************************************************************
; Import IRQ handlers from 71x_it.c
;*******************************************************************************
IMPORT T0TIMI_IRQHandler
IMPORT FLASH_IRQHandler
IMPORT RCCU_IRQHandler
IMPORT RTC_IRQHandler
IMPORT WDG_IRQHandler
IMPORT XTI_IRQHandler
IMPORT USBHP_IRQHandler
IMPORT I2C0ITERR_IRQHandler
IMPORT I2C1ITERR_IRQHandler
IMPORT UART0_IRQHandler
IMPORT UART1_IRQHandler
IMPORT UART2_IRQHandler
IMPORT UART3_IRQHandler
IMPORT BSPI0_IRQHandler
IMPORT BSPI1_IRQHandler
IMPORT I2C0_IRQHandler
IMPORT I2C1_IRQHandler
IMPORT CAN_IRQHandler
IMPORT ADC12_IRQHandler
IMPORT T1TIMI_IRQHandler
IMPORT T2TIMI_IRQHandler
IMPORT T3TIMI_IRQHandler
IMPORT HDLC_IRQHandler
IMPORT USBLP_IRQHandler
IMPORT T0TOI_IRQHandler
IMPORT T0OC1_IRQHandler
IMPORT T0OC2_IRQHandler
;*******************************************************************************
; Export Peripherals IRQ handlers table address
;*******************************************************************************
EXPORT T0TIMI_Addr
EXPORT IRQHandler
;*******************************************************************************
;
;*******************************************************************************
EXPORT vector_begin
EXPORT vector_end
vector_begin
;*******************************************************************************
; 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
LDR PC, FIQ_Addr
;*******************************************************************************
; Exception handlers address table
;*******************************************************************************
Reset_Addr DCD Reset_Handler
Undefined_Addr DCD UndefinedHandler
SWI_Addr DCD SWIHandler
Prefetch_Addr DCD PrefetchAbortHandler
Abort_Addr DCD DataAbortHandler
DCD 0 ; Reserved vector
IRQ_Addr DCD IRQHandler
FIQ_Addr DCD FIQHandler
;*******************************************************************************
; Peripherals IRQ handlers address table
;*******************************************************************************
T0TIMI_Addr DCD T0TIMIIRQHandler
FLASH_Addr DCD FLASHIRQHandler
RCCU_Addr DCD RCCUIRQHandler
RTC_Addr DCD RTCIRQHandler
WDG_Addr DCD WDGIRQHandler
XTI_Addr DCD XTIIRQHandler
USBHP_Addr DCD USBHPIRQHandler
I2C0ITERR_Addr DCD I2C0ITERRIRQHandler
I2C1ITERR_ADDR DCD I2C1ITERRIRQHandler
UART0_Addr DCD UART0IRQHandler
UART1_Addr DCD UART1IRQHandler
UART2_ADDR DCD UART2IRQHandler
UART3_ADDR DCD UART3IRQHandler
BSPI0_ADDR DCD BSPI0IRQHandler
BSPI1_Addr DCD BSPI1IRQHandler
I2C0_Addr DCD I2C0IRQHandler
I2C1_Addr DCD I2C1IRQHandler
CAN_Addr DCD CANIRQHandler
ADC12_Addr DCD ADC12IRQHandler
T1TIMI_Addr DCD T1TIMIIRQHandler
T2TIMI_Addr DCD T2TIMIIRQHandler
T3TIMI_Addr DCD T3TIMIIRQHandler
DCD 0 ; reserved
DCD 0 ; reserved
DCD 0 ; reserved
HDLC_Addr DCD HDLCIRQHandler
USBLP_Addr DCD USBLPIRQHandler
DCD 0 ; reserved
DCD 0 ; reserved
T0TOI_Addr DCD T0TOIIRQHandler
T0OC1_Addr DCD T0OC1IRQHandler
T0OC2_Addr DCD T0OC2IRQHandler
vector_end
;*******************************************************************************
; Exception Handlers
;*******************************************************************************
;*******************************************************************************
;* Macro Name : SaveContext
;* Description : This macro used to save the context before entering
; an exception handler.
;* Input : The range of registers to store.
;* Output : none
;*******************************************************************************
MACRO
SaveContext $reg1,$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.
MEND
;*******************************************************************************
;* Macro Name : RestoreContext
;* Description : This macro 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
;*******************************************************************************
MACRO
RestoreContext $reg1,$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.
MEND
;*******************************************************************************
;* Function Name : UndefinedHandler
;* Description : This function 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.
BL Undefined_Handler; Branch to Undefined_Handler.
RestoreContext r0,r12 ; Return to the instruction following...
; ...the undefined instruction.
;*******************************************************************************
;* Function Name : SWIHandler
;* Description : This function called when SWI instruction executed.
;* Input : none
;* Output : none
;*******************************************************************************
SWIHandler
SaveContext r0,r12 ; Save the workspace plus the current
; return address lr_ svc and spsr_svc.
BL SWI_Handler ; Branch to SWI_Handler.
RestoreContext r0,r12 ; Return to the instruction following...
; ...the SWI instruction.
;*******************************************************************************
;* Function Name : IRQHandler
;* Description : This function called when IRQ exception is entered.
;* Input : none
;* Output : none
;*******************************************************************************
IRQHandler
SUB lr,lr,#4 ; Update the link register
SaveContext r0,r12 ; Save the workspace plus the current
; return address lr_ irq and spsr_irq.
LDR lr, =ReturnAddress ; Read the return address.
LDR r0, =EIC_base_addr
LDR r1, =IVR_off_addr
ADD pc,r0,r1 ; Branch to the IRQ handler.
ReturnAddress
; Clear pending bit in EIC (using the proper IPRx)
LDR r0, =EIC_base_addr
LDR r2, [r0, #CICR_off_addr] ; Get the IRQ channel number.
MOV r3,#1
MOV r3,r3,LSL r2
STR r3,[r0, #IPR_off_addr] ; Clear the corresponding IPR bit.
RestoreContext r0,r12 ; Restore the context and return to the...
; ...program execution.
;*******************************************************************************
;* Function Name : PrefetchAbortHandler
;* Description : This function 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.
BL Prefetch_Handler; Branch to Prefetch_Handler.
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.
BL Abort_Handler ; Branch to Abort_Handler.
RestoreContext r0,r12 ; Return to the instruction following that...
; ...has generated the data abort exception.
;*******************************************************************************
;* 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.
SaveContext r0,r7 ; Save the workspace plus the current
; return address lr_ fiq and spsr_fiq.
BL FIQ_Handler ; Branch to FIQ_Handler.
RestoreContext r0,r7 ; Restore the context and return to the...
; ...program execution.
;*******************************************************************************
;* Macro Name : IRQ_to_SYS
;* Description : This macro used to switch form IRQ mode to SYS mode
;* Input : none.
;* Output : none
;*******************************************************************************
MACRO
IRQ_to_SYS
MSR cpsr_c,#0x1F ; Switch to SYS mode
STMFD sp!,{lr} ; Save the link register.
MEND
;*******************************************************************************
;* Macro Name : SYS_to_IRQ
;* Description : This macro used to switch from SYS mode to IRQ mode
; then to return to IRQHnadler routine.
;* Input : none.
;* Output : none.
;*******************************************************************************
MACRO
SYS_to_IRQ
LDMFD sp!,{lr} ; Restore the link register.
MSR cpsr_c,#0xD2 ; Switch to IRQ mode.
MOV pc,lr ; Return to IRQHandler routine to clear the
; pending bit.
MEND
;*******************************************************************************
;* Function Name : T0TIMIIRQHandler
;* Description : This function used to switch to SYS mode before entering
; the T0TIMI_IRQHandler function located in 71x_it.c.
; Then to return to IRQ mode after the
; T0TIMI_IRQHandler function termination.
;* Input : none.
;* Output : none.
;*******************************************************************************
T0TIMIIRQHandler
IRQ_to_SYS
BL T0TIMI_IRQHandler
SYS_to_IRQ
;*******************************************************************************
;* Function Name : FLASHIRQHandler
;* Description : This function used to switch to SYS mode before entering
; the FLASH_IRQHandler function located in 71x_it.c.
; Then to return to IRQ mode after the
; FLASH_IRQHandler function termination.
;* Input : none
;* Output : none
;*******************************************************************************
FLASHIRQHandler
IRQ_to_SYS
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