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当异常发生时，ARM处理器自动将PC更新为向量表中的中断入口地址。处理器挂起正常的指令执行，将流水线重新刷新，并开始装载异常处理指令进行执行。
向量表保存的一般为跳转地址。
Each vector table entry contains a form of branch instruction pointing to the start of a specific routine:
- 复位向量 处理器上电时第一条需要执行的指令的位置，该指令将跳转至初始化代码段，执行系统初始化功能。
- 软件中断向量 当处理器执行SWI指令时，SWI指令常用于调用操作系统API，由用户态切换至内核态时。
- 预取终止向量 当处理器试图从一个未授权的地址取指令时，实际的异常在流水线解码阶段发生。
- 数据终止向量 当处理器试图从一个未授权的地址取数据时。与预取终止类似。
- 中断请求向量 当外设发出请求并中断处理器正常执行流程时，仅在CPSR中I标志位未屏蔽时。
- 快速中断请求向量 与中断请求类似，保留给需要快速响应的硬件外设，仅在CPSR中F标志位未屏蔽时。
示例：CMSIS Cortex-M0P Core Device Startup File，摘自KSDK 1.3
; The modules in this file are included in the libraries, and may be replaced
; by any user-defined modules that define the PUBLIC symbol _program_start or
; a user defined start symbol.
; To override the cstartup defined in the library, simply add your modified
; version to the workbench project.
;
; The vector table is normally located at address 0.
; When debugging in RAM, it can be located in RAM, aligned to at least 2^6.
; The name "__vector_table" has special meaning for C-SPY:
; it is where the SP start value is found, and the NVIC vector
; table register (VTOR) is initialized to this address if != 0.
;
; Cortex-M version
;
MODULE ?cstartup
;; Forward declaration of sections.
SECTION CSTACK ATA:NOROOT(3)
SECTION .intvec:CODE:NOROOT(2)
EXTERN __iar_program_start
EXTERN SystemInit
EXTERN init_data_bss
PUBLIC __vector_table
PUBLIC __vector_table_0x1c
PUBLIC __Vectors
PUBLIC __Vectors_End
PUBLIC __Vectors_Size
DATA
__vector_table
DCD sfe(CSTACK)
DCD Reset_Handler
DCD NMI_Handler ;NMI Handler
DCD HardFault_Handler ;Hard Fault Handler
DCD 0 ;Reserved
DCD 0 ;Reserved
DCD 0 ;Reserved
__vector_table_0x1c
DCD 0 ;Reserved
DCD 0 ;Reserved
DCD 0 ;Reserved
DCD 0 ;Reserved
DCD SVC_Handler ;SVCall Handler
DCD 0 ;Reserved
DCD 0 ;Reserved
DCD PendSV_Handler  endSV Handler
DCD SysTick_Handler ;SysTick Handler
;External Interrupts
DCD DMA0_IRQHandler ;DMA channel 0 transfer complete
DCD DMA1_IRQHandler ;DMA channel 1 transfer complete
DCD DMA2_IRQHandler ;DMA channel 2 transfer complete
DCD DMA3_IRQHandler ;DMA channel 3 transfer complete
DCD Reserved20_IRQHandler ;Reserved interrupt
DCD FTFA_IRQHandler ;Command complete and read collision
DCD PMC_IRQHandler ;Low-voltage detect, low-voltage warning
DCD LLWU_IRQHandler ;Low leakage wakeup
DCD I2C0_IRQHandler ;I2C0 interrupt
DCD I2C1_IRQHandler ;I2C1 interrupt
DCD SPI0_IRQHandler ;SPI0 single interrupt vector for all sources
DCD SPI1_IRQHandler ;SPI1 single interrupt vector for all sources
DCD LPUART0_IRQHandler ;LPUART0 status and error
DCD LPUART1_IRQHandler ;LPUART1 status and error
DCD UART2_FLEXIO_IRQHandler ;UART2 or FLEXIO
DCD ADC0_IRQHandler ;ADC0 interrupt
DCD CMP0_IRQHandler ;CMP0 interrupt
DCD TPM0_IRQHandler ;TPM0 single interrupt vector for all sources
DCD TPM1_IRQHandler ;TPM1 single interrupt vector for all sources
DCD TPM2_IRQHandler ;TPM2 single interrupt vector for all sources
DCD RTC_IRQHandler ;RTC alarm
DCD RTC_Seconds_IRQHandler ;RTC seconds
DCD PIT_IRQHandler IT interrupt
DCD Reserved39_IRQHandler ;Reserved interrupt
DCD Reserved40_IRQHandler ;Reserved interrupt
DCD Reserved41_IRQHandler ;Reserved interrupt
DCD Reserved42_IRQHandler ;Reserved interrupt
DCD Reserved43_IRQHandler ;Reserved interrupt
DCD LPTMR0_IRQHandler ;LPTMR0 interrupt
DCD Reserved45_IRQHandler ;Reserved interrupt
DCD PORTA_IRQHandler ORTA Pin detect
DCD PORTBCDE_IRQHandler ;Single interrupt vector for PORTB,PORTC,PORTD,PORTE
__Vectors_End
SECTION FlashConfig:CODE
__FlashConfig
DCD 0xFFFFFFFF
DCD 0xFFFFFFFF
DCD 0xFFFFFFFF
DCD 0xFFFF3DFE
__FlashConfig_End
__Vectors EQU __vector_table
__Vectors_Size EQU __Vectors_End - __Vectors
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Default interrupt handlers.
;;
THUMB
PUBWEAK Reset_Handler
SECTION .text:CODE:REORDER:NOROOT(2)
Reset_Handler
CPSID I ; Mask interrupts
LDR R0, =SystemInit
BLX R0
LDR R0, =init_data_bss
BLX R0
CPSIE I ; Unmask interrupts
LDR R0, =__iar_program_start
BX R0
PUBWEAK NMI_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
NMI_Handler
B .
PUBWEAK HardFault_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
HardFault_Handler
B .
PUBWEAK SVC_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
SVC_Handler
B .
PUBWEAK PendSV_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
PendSV_Handler
B .
PUBWEAK SysTick_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
SysTick_Handler
B .
PUBWEAK DMA0_IRQHandler
PUBWEAK DMA1_IRQHandler
PUBWEAK DMA2_IRQHandler
PUBWEAK DMA3_IRQHandler
PUBWEAK Reserved20_IRQHandler
PUBWEAK FTFA_IRQHandler
PUBWEAK PMC_IRQHandler
PUBWEAK LLWU_IRQHandler
PUBWEAK I2C0_IRQHandler
PUBWEAK I2C1_IRQHandler
PUBWEAK SPI0_IRQHandler
PUBWEAK SPI1_IRQHandler
PUBWEAK LPUART0_IRQHandler
PUBWEAK LPUART1_IRQHandler
PUBWEAK UART2_FLEXIO_IRQHandler
PUBWEAK ADC0_IRQHandler
PUBWEAK CMP0_IRQHandler
PUBWEAK TPM0_IRQHandler
PUBWEAK TPM1_IRQHandler
PUBWEAK TPM2_IRQHandler
PUBWEAK RTC_IRQHandler
PUBWEAK RTC_Seconds_IRQHandler
PUBWEAK PIT_IRQHandler
PUBWEAK Reserved39_IRQHandler
PUBWEAK Reserved40_IRQHandler
PUBWEAK Reserved41_IRQHandler
PUBWEAK Reserved42_IRQHandler
PUBWEAK Reserved43_IRQHandler
PUBWEAK LPTMR0_IRQHandler
PUBWEAK Reserved45_IRQHandler
PUBWEAK PORTA_IRQHandler
PUBWEAK PORTBCDE_IRQHandler
PUBWEAK DefaultISR
SECTION .text:CODE:REORDER:NOROOT(2)
DMA0_IRQHandler
DMA1_IRQHandler
DMA2_IRQHandler
DMA3_IRQHandler
Reserved20_IRQHandler
FTFA_IRQHandler
PMC_IRQHandler
LLWU_IRQHandler
I2C0_IRQHandler
I2C1_IRQHandler
SPI0_IRQHandler
SPI1_IRQHandler
LPUART0_IRQHandler
LPUART1_IRQHandler
UART2_FLEXIO_IRQHandler
ADC0_IRQHandler
CMP0_IRQHandler
TPM0_IRQHandler
TPM1_IRQHandler
TPM2_IRQHandler
RTC_IRQHandler
RTC_Seconds_IRQHandler
PIT_IRQHandler
Reserved39_IRQHandler
Reserved40_IRQHandler
Reserved41_IRQHandler
Reserved42_IRQHandler
Reserved43_IRQHandler
LPTMR0_IRQHandler
Reserved45_IRQHandler
PORTA_IRQHandler
PORTBCDE_IRQHandler
DefaultISR
LDR R0, =DefaultISR
BX R0
END
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发表于 2015-11-19 11:12:14
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