Philips LPC2119 User Manual page 267

Philips Semiconductors
ARM-based Microcontroller
;MSR spsr, r12
;STMFD sp!, {r0}
;LDR r0, =VICBaseAddr
;STR r1, [r0,#VICVectAddrOffset] ;Acknowledge Non Vectored irq has finished
;LDMFD sp!, {r12,r14,r0}
;SUBS pc, r14, #4
;user interrupt did not happen so call rm_irqhandler2. This handler
;is not aware of the VIC interrupt priority hardware so trick
;rm_irqhandler2 to return here
STMFD sp!, {ip,pc}
LDR pc, rm_irqhandler2
;rm_irqhandler2 returns here
MSR cpsr_c, #0x52
MSR spsr, r12
STMFD sp!, {r0}
LDR r0, =VICBaseAddr
STR r1, [r0,#VICVectAddrOffset] ;Acknowledge Non Vectored irq has finished
LDMFD sp!, {r12,r14,r0}
SUBS pc, r14, #4
END
RealMonitor
;Restore SPSR from r12
;Restore registers
;Return to the interrupted instruction
;Disable irq, move to IRQ mode
;Restore SPSR from r12
;Restore registers
;Return to the interrupted instruction
267
Preliminary User Manual
LPC2119/2129/2292/2294
January 08, 2004