UPT_SYSCALL_ARG4   18 arch/x86/um/shared/sysdep/ptrace_32.h #define UPT_SYSCALL_ARG4(r) UPT_SI(r)
UPT_SYSCALL_ARG4   56 arch/x86/um/shared/sysdep/ptrace_64.h #define UPT_SYSCALL_ARG4(r) UPT_R10(r)