我用KEIL MDK3.15B调试AT91SAM7S64时，当发生IRQ中断时，这跳到IRQ_Handler: B IRQ_Handler，就停在这条上，不会跳到我想的中断程序中，下面是KEIL自带的ARM7S.S的其中一段(是例子里面的，原来的ARM7.S连MAIN都进不了)，这是不是KEIL软件的问题？如何改才可以进了我写好的中断里。
# Exception Vectors
# Mapped to Address 0.
# Absolute addressing mode must be used.
# Dummy Handlers are implemented as infinite loops which can be modified.
Vectors: LDR PC,Reset_Addr
LDR PC,Undef_Addr
LDR PC,SWI_Addr
LDR PC,PAbt_Addr
LDR PC,DAbt_Addr
NOP /* Reserved Vector */
; LDR PC,IRQ_Addr
LDR PC,[PC,#-0xF20] /* Vector From AIC_IVR */
; LDR PC,FIQ_Addr
LDR PC,[PC,#-0xF20] /* Vector From AIC_FVR */
Reset_Addr: .word Reset_Handler
Undef_Addr: .word Undef_Handler
SWI_Addr: .word SWI_Handler
PAbt_Addr: .word PAbt_Handler
DAbt_Addr: .word DAbt_Handler
.word 0 /* Reserved Address */
IRQ_Addr: .word IRQ_Handler
FIQ_Addr: .word FIQ_Handler
Undef_Handler: B Undef_Handler
SWI_Handler: B SWI_Handler
PAbt_Handler: B PAbt_Handler
DAbt_Handler: B DAbt_Handler
IRQ_Handler: B IRQ_Handler
FIQ_Handler: B FIQ_Handler
# Reset Handler
Reset_Handler: |
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