x19 674 arch/arm64/include/asm/assembler.h __frame_regs x19, x20, \op, 1 x19 110 arch/arm64/include/asm/processor.h unsigned long x19; x19 135 arch/arm64/kernel/kgdb.c gdb_regs[19] = cpu_context->x19; x19 415 arch/arm64/kernel/process.c p->thread.cpu_context.x19 = stack_start;