What does "THUMB" macro do in ARM-linux code? -


i looking @ head.s arm linux code. know thumb mode is. there 1 line such thumb(it eq) , predefined macro #define thumb(x...) x dotdotdot written.

please tell me macro does.

entry(stext)   setmode psr_f_bit | psr_i_bit | svc_mode, r9 @ ensure svc mode                                                @ , irqs disabled   mrc p15, 0, r9, c0, c0      @ processor id   bl__lookup_processor_type   @ r5=procinfo r9=cpuid   movs r10, r5                @ invalid processor (r5=0)?    thumb( iteq )               @ force fixup-able long branch encoding   beq __error_p               @ yes, error 'p'

thumb() arm() preprocessor macros used conditionally compile source assembly depending on target instruction set. if kernel being compiled arm target, thumb() macro no-op. on contrary, if kernel being compiled thumb, thumb() macro expanded arguments.


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