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请教 汇编语法

; --- Setup interrupt / exception vectors
IF :DEF: ROM_AT_ADDRESS_ZERO
; If the ROM is at address 0 this is just a sequence of branches
B Reset_Handler
B Undefined_Handler
B SWI_Handler
B Prefetch_Handler
B Abort_Handler
NOP ; Reserved vector
B IRQ_Handler
B FIQ_Handler
ELSE
请问:[B]IF :DEF: ROM_AT_ADDRESS_ZERO[/B]
这调语句是怎么理解的阿?
关键词: 请教 汇编 语法
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