sc_a1 28 arch/c6x/include/uapi/asm/sigcontext.h unsigned long sc_a1; sc_a1 11 arch/m68k/include/uapi/asm/sigcontext.h unsigned long sc_a1; sc_a1 713 arch/m68k/kernel/signal.c regs->a1 = context.sc_a1; sc_a1 840 arch/m68k/kernel/signal.c sc->sc_a1 = regs->a1;