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arch/arm/kernel/entry-armv.S 1183 .L__vectors_start: ... 1191 W(b) vector_fiq 732 .align 5 733 __fiq_usr: 734 usr_entry trace=0 735 kuser_cmpxchg_check 736 mov r0, sp @ struct pt_regs *regs 737 bl handle_fiq_as_nmi 738 get_thread_info tsk 739 restore_user_regs fast = 0, offset = 0 740 UNWIND(.fnend ) 741 ENDPROC(__fiq_usr)
arch/arm/kernel/traps.chandle_fiq_as_nmi nmi_enter ... // arm-linux 没有实现 fiq nmi_exit
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