UPT_SYSCALL_ARG2   16 arch/x86/um/shared/sysdep/ptrace_32.h #define UPT_SYSCALL_ARG2(r) UPT_CX(r)
UPT_SYSCALL_ARG2   54 arch/x86/um/shared/sysdep/ptrace_64.h #define UPT_SYSCALL_ARG2(r) UPT_SI(r)