at91_reset.arm

ARM入门的好帮手.包含了从简单到相对较复杂的程序.

;***************************************************************************
;* File Name 	: at91_reset.arm
;*
;* Description	: Define the ARM7 vector area.  This should be located or
;* 		  copied to 0.
;*
;* George Zhang : 08/25/2000
;***************************************************************************
               
; Define the ARM7 vector area.  This should be located or copied to 0. 
.section    ".reset","ax"

__vectors:
    	B       START                          ; Reset goes to the entry function

undefvec:
    	LDR     pc,UNDEFINED                   ; Undefined handler

swivec:
    	LDR     pc,SWI                         ; Software interrupt handler

pabtvec:
    	LDR     pc,PREFETCH                    ; Prefetch exeception handler

dabtvec:
    	LDR     pc,ABORT                       ; Abort exception handler

rsvdvec:
    	LDR     pc,RESERVED                    ; Reserved exception handler

irqvec:
    	LDR     PC,[PC,-0xf20]                 ; IRQ interrupt handler

fiqvec:
    	LDR     PC,[PC,-0xf20]                 ; FIQ interrupt handler


START:
    	.data.w _start                         ; Reset goes to startup function

UNDEFINED:
    	.data.w __tx_undefined                 ; Undefined handler

SWI:
    	.data.w __tx_swi_interrupt             ; Software interrupt handler

PREFETCH:
    	.data.w __tx_prefetch_handler          ; Prefetch exeception handler

ABORT:
    	.data.w __tx_abort_handler             ; Abort exception handler

RESERVED:
    	.data.w __tx_reserved_handler          ; Reserved exception handler

    .type __vectors,$function
    .size __vectors,.-__vectors