tag	line	file	source code
FR_REG20	39	include/asm-mips/stackframe.h	#define FR_REG21  ((FR_REG20) + 4)
FR_REG20	123	include/asm-mips/stackframe.h	sw  $20,FR_REG20(sp);               \
FR_REG20	160	include/asm-mips/stackframe.h	lw  $20,FR_REG20(sp);               \