func (this *Fpu) compute(op *operation.Operation, info *info.Info, operands interface{}) (uint32, error) {
op1, op2, outputAddr, err := this.getOperands(info, operands)
if err != nil {
return 0, err
}
switch info.Opcode {
case set.OP_FADD:
val1 := this.Bus().LoadRegister(op, op1)
val2 := this.Bus().LoadRegister(op, op2)
this.SetResult(ieee754.PackFloat754_32(ieee754.UnPackFloat754_32(val1) + ieee754.UnPackFloat754_32(val2)))
case set.OP_FSUB:
val1 := this.Bus().LoadRegister(op, op1)
val2 := this.Bus().LoadRegister(op, op2)
this.SetResult(ieee754.PackFloat754_32(ieee754.UnPackFloat754_32(val1) - ieee754.UnPackFloat754_32(val2)))
case set.OP_FMUL:
val1 := this.Bus().LoadRegister(op, op1)
val2 := this.Bus().LoadRegister(op, op2)
this.SetResult(ieee754.PackFloat754_32(ieee754.UnPackFloat754_32(val1) * ieee754.UnPackFloat754_32(val2)))
case set.OP_FDIV:
val1 := this.Bus().LoadRegister(op, op1)
val2 := this.Bus().LoadRegister(op, op2)
this.SetResult(ieee754.PackFloat754_32(ieee754.UnPackFloat754_32(val1) / ieee754.UnPackFloat754_32(val2)))
default:
return 0, errors.New(fmt.Sprintf("Invalid operation to process by FPU unit. Opcode: %d", info.Opcode))
}
return outputAddr, nil
}
func (this Set) GetInstructionFromString(line string, address uint32, labels map[string]uint32) (*instruction.Instruction, error) {
// Clean line and split by items
items, err := getItemsFromString(line)
if err != nil {
return nil, err
}
// Search opcode in the instruction set
opInfo, err := this.GetInstructionInfoFromName(items[0])
if err != nil {
return nil, err
}
// Check all operands (except opcode/operation) is a numeric value
operands := []uint32{uint32(opInfo.Opcode)}
for _, value := range items[1:] {
if strings.TrimSpace(value) == "" {
continue
}
labelAddress, isLabel := labels[value]
if isLabel {
if opInfo.Type == data.TypeJ {
offset := computeBranchAddress(labelAddress)
operands = append(operands, offset)
} else {
offset := computeBranchOffset(labelAddress, address)
operands = append(operands, offset)
}
} else {
if opInfo.Category == info.FloatingPoint && !strings.Contains(value, "R") {
floatValue, err := strconv.ParseFloat(value, consts.ARCHITECTURE_SIZE)
if err != nil {
return nil, errors.New(fmt.Sprintf("Expecting a float value and found: %s. %s", value, err.Error()))
}
operands = append(operands, ieee754.PackFloat754_32(float32(floatValue)))
} else {
integer, err := strconv.Atoi(strings.Replace(value, "R", "", -1))
if err != nil {
return nil, errors.New(fmt.Sprintf("Expecting an integer or RX operand and found: %s", value))
}
operands = append(operands, uint32(integer))
}
}
}
// Get data object from operands
data, err := data.GetDataFromParts(opInfo.Type, operands...)
if err != nil {
return nil, err
}
return instruction.New(opInfo, data), nil
}
