parms[1] = unsafe.Pointer(&userdata[0])
	parms[2] = unsafe.Pointer(&rv)
	parms[3] = unsafe.Pointer(&rc)
	parms[4] = unsafe.Pointer(&rn)
	bpxcall(parms[:], BPX4PTQ)
	return rv, rc, rn
}

const (
	PT_TRACE_ME             = 0  // Debug this process
	PT_READ_I               = 1  // Read a full word
	PT_READ_D               = 2  // Read a full word
	PT_READ_U               = 3  // Read control info

	PT_READ_I                     = 0x1
	PT_REATT                      = 0x21
	PT_REGSET                     = 0x20
	PT_SET                        = 0x25
	PT_STEP                       = 0x9
	PT_TRACE_ME                   = 0x0
	PT_WATCH                      = 0x29
	PT_WRITE_BLOCK                = 0x13
	PT_WRITE_D                    = 0x5
	PT_WRITE_FPR                  = 0xf
	PT_WRITE_GPR                  = 0xe

func raw_ptrace(request int, pid int, addr *byte, data *byte) Errno {
	if request == PTRACE_TRACEME {
		// Convert to AIX ptrace call.
		err := ptrace64(PT_TRACE_ME, 0, 0, 0, 0)
		if err != nil {
			return err.(Errno)
		}
		return 0
	}
	return ENOSYS
}

func ptracePeek(pid int, addr uintptr, out []byte) (count int, err error) {
	n := 0