tag	line	file	source code
FR_REG21	40	include/asm-mips/stackframe.h	#define FR_REG22  ((FR_REG21) + 4)
FR_REG21	124	include/asm-mips/stackframe.h	sw  $21,FR_REG21(sp);               \
FR_REG21	159	include/asm-mips/stackframe.h	lw  $21,FR_REG21(sp);               \