RA 106 kernel/arch/mips32/src/debug/stacktrace.c ((0x0 << OP_SHIFT) | (RA << RS_SHIFT) | (0x0 << HINT_SHIFT) | 0x8) RA 108 kernel/arch/mips32/src/debug/stacktrace.c ((0x2b << OP_SHIFT) | (RA << RT_SHIFT))