Exemplo n.º 1
0
func (s Syscall) traceArg(args ...interface{}) string {
	hex := func(a interface{}) string {
		tmp := fmt.Sprintf("0x%x", a)
		if strings.HasPrefix(tmp, "0x-") {
			tmp = "-0x" + tmp[3:]
		}
		return tmp
	}

	switch arg := args[0].(type) {
	case Obuf:
		return hex(arg.Addr)
	case Buf:
		if len(args) > 1 {
			if length, ok := args[1].(Len); ok {
				mem, _ := s.Kernel.U.MemRead(arg.Addr, uint64(length))
				return models.Repr(mem, s.Kernel.U.Config().Strsize)
			}
		}
		return hex(arg.Addr)
	case Off:
		return hex(arg)
	case Ptr:
		return hex(arg)
	case Fd:
		return fmt.Sprintf("%d", int32(arg))
	case string:
		return models.Repr([]byte(arg), s.Kernel.U.Config().Strsize)
	case uint64:
		return hex(arg)
	default:
		return fmt.Sprintf("%v", arg)
	}
}
Exemplo n.º 2
0
func (s Syscall) traceArg(args []uint64, typ reflect.Type) string {
	if typ == BufType && len(args) > 1 {
		mem, _ := s.U().MemRead(args[0], args[1])
		return models.Repr(mem)
	}
	switch typ {
	case BufType, ObufType, OffType, PtrType:
		return fmt.Sprintf("0x%x", args[0])
	case LenType, FdType:
		return fmt.Sprintf("%d", args[0])
	default:
		switch typ.Kind() {
		case reflect.String:
			s, _ := s.U().Mem().ReadStrAt(args[0])
			return models.Repr([]byte(s))
		default:
			// TODO: facilitate pretty printing?
			if v, ok := s.Unpack(args, typ); ok {
				return fmt.Sprintf("%v", v.Interface())
			}
			return fmt.Sprintf("%d", int32(args[0]))
		}
	}
}
Exemplo n.º 3
0
func (s Syscall) TraceRet(args []uint64, ret uint64) {
	var out []string
	for i, typ := range s.In {
		if typ == ObufType && len(args) > i+1 {
			r := int(ret)
			if uint64(r) <= args[i+1] && r >= 0 {
				mem, _ := s.U().MemRead(args[i], uint64(r))
				out = append(out, models.Repr(mem))
			}
		}
	}
	if len(s.Out) > 0 {
		out = append(out, s.traceArg([]uint64{ret}, s.Out[0]))
	}
	if len(out) > 0 {
		fmt.Fprintf(os.Stderr, " = %s\n", strings.Join(out, ", "))
	} else {
		fmt.Fprintf(os.Stderr, "\n")
	}
}
Exemplo n.º 4
0
func (s Syscall) TraceRet(args []uint64, ret uint64) string {
	var out []string
	for i, typ := range s.In {
		if typ == reflect.TypeOf(Obuf{}) && len(args) > i+1 {
			length := int(ret)
			if uint64(length) <= args[i+1] && length >= 0 {
				mem, _ := s.Kernel.U.MemRead(args[i], uint64(length))
				out = append(out, models.Repr(mem, s.Kernel.U.Config().Strsize))
			}
		}
	}
	if len(s.Out) > 0 {
		// TODO: need a standard for converting return values
		out = append(out, s.traceArg(ret))
	}
	if len(out) > 0 {
		return fmt.Sprintf(" = %s\n", strings.Join(out, ", "))
	} else {
		return "\n"
	}
}