REG_SP             19 arch/arm/nwfpe/fpmodule.h #define REG_SP		13
REG_SP             32 arch/sh/kernel/signal_64.c #define REG_SP 15
REG_SP            300 tools/testing/selftests/x86/sigreturn.c # define REG_SP REG_RSP
REG_SP            320 tools/testing/selftests/x86/sigreturn.c # define REG_SP REG_ESP