参照元†
返り値†
.align 5
__irq_usr:
usr_entry
kuser_cmpxchg_check
get_thread_info tsk
#ifdef CONFIG_PREEMPT
ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
add r7, r8, #1 @ increment it
str r7, [tsk, #TI_PREEMPT]
#endif
irq_handler
#ifdef CONFIG_PREEMPT
ldr r0, [tsk, #TI_PREEMPT]
str r8, [tsk, #TI_PREEMPT]
teq r0, r7
ARM( strne r0, [r0, -r0] )
THUMB( movne r0, #0 )
THUMB( strne r0, [r0] )
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
bl trace_hardirqs_on
#endif
mov why, #0
b ret_to_user
UNWIND(.fnend )
ENDPROC(__irq_usr)
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