a21 144 arch/c6x/include/uapi/asm/ptrace.h REG_PAIR(a21, a20); a21 21 arch/c6x/kernel/asm-offsets.c OFFSET(REGS_A21, pt_regs, a21); a21 47 arch/c6x/kernel/signal.c COPY(a20); COPY(a21); COPY(a22); COPY(a23); a21 112 arch/c6x/kernel/signal.c COPY(a20); COPY(a21); COPY(a22); COPY(a23); a21 55 arch/c6x/kernel/traps.c pr_err("A21: %08lx B21: %08lx\n", regs->a21, regs->b21);