?? isr_a.s
字號:
;***************************************************
;*The function for interrupt
;***************************************************
AREA INTFUN, CODE, READONLY
EXPORT INTS_OFF
EXPORT INTS_ON
INTS_OFF
mrs r0, cpsr ; current CSR
mov r1, r0 ; make a copy for masking
orr r1, r1, #0xC0 ; mask off int bits
msr CPSR_cxsf, r1 ; disable ints (IRQ and FIQ)
and r0, r0, #0x80 ; return FIQ bit from original CSR
mov pc,lr ; return
INTS_ON
mrs r0, cpsr ; current CSR
bic r0, r0, #0xC0 ; mask on ints
msr CPSR_cxsf, r0 ; enable ints (IRQ and FIQ)
mov pc,lr ; return
END
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