/
op_sub.go
205 lines (166 loc) · 5.64 KB
/
op_sub.go
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package procbuilder
import (
"errors"
"strconv"
"strings"
"github.com/BondMachineHQ/BondMachine/pkg/bmline"
"github.com/BondMachineHQ/BondMachine/pkg/bmmeta"
"github.com/BondMachineHQ/BondMachine/pkg/bmreqs"
)
// The Sub opcode is both a basic instruction and a template for other instructions.
type Sub struct{}
func (op Sub) Op_get_name() string {
return "sub"
}
func (op Sub) Op_get_desc() string {
return "Register sub"
}
func (op Sub) Op_show_assembler(arch *Arch) string {
opbits := arch.Opcodes_bits()
result := "sub [" + strconv.Itoa(int(arch.R)) + "(Reg)] [" + strconv.Itoa(int(arch.R)) + "(Reg)] // Set a register to the sub of its value with another register [" + strconv.Itoa(opbits+int(arch.R)+int(arch.R)) + "]\n"
return result
}
func (op Sub) Op_get_instruction_len(arch *Arch) int {
opbits := arch.Opcodes_bits()
return opbits + int(arch.R) + int(arch.R) // The bits for the opcode + bits for a register + bits for another register
}
func (op Sub) OpInstructionVerilogHeader(conf *Config, arch *Arch, flavor string, pname string) string {
return ""
}
func (op Sub) Op_instruction_verilog_state_machine(conf *Config, arch *Arch, rg *bmreqs.ReqRoot, flavor string) string {
rom_word := arch.Max_word()
opbits := arch.Opcodes_bits()
reg_num := 1 << arch.R
result := ""
result += " SUB: begin\n"
if arch.R == 1 {
result += " case (current_instruction[" + strconv.Itoa(rom_word-opbits-1) + "])\n"
} else {
result += " case (current_instruction[" + strconv.Itoa(rom_word-opbits-1) + ":" + strconv.Itoa(rom_word-opbits-int(arch.R)) + "])\n"
}
for i := 0; i < reg_num; i++ {
result += " " + strings.ToUpper(Get_register_name(i)) + " : begin\n"
if arch.R == 1 {
result += " case (current_instruction[" + strconv.Itoa(rom_word-opbits-int(arch.R)-1) + "])\n"
} else {
result += " case (current_instruction[" + strconv.Itoa(rom_word-opbits-int(arch.R)-1) + ":" + strconv.Itoa(rom_word-opbits-int(arch.R)-int(arch.R)) + "])\n"
}
for j := 0; j < reg_num; j++ {
result += " " + strings.ToUpper(Get_register_name(j)) + " : begin\n"
result += " _" + strings.ToLower(Get_register_name(i)) + " <= #1 _" + strings.ToLower(Get_register_name(i)) + " - _" + strings.ToLower(Get_register_name(j)) + ";\n"
result += " $display(\"SUB " + strings.ToUpper(Get_register_name(i)) + " " + strings.ToUpper(Get_register_name(j)) + "\");\n"
result += " end\n"
}
result += " endcase\n"
result += " end\n"
}
result += " endcase\n"
result += NextInstruction(conf, arch, 6, "_pc + 1'b1")
result += " end\n"
return result
}
func (op Sub) Op_instruction_verilog_footer(arch *Arch, flavor string) string {
// TODO
return ""
}
func (op Sub) Assembler(arch *Arch, words []string) (string, error) {
opbits := arch.Opcodes_bits()
rom_word := arch.Max_word()
reg_num := 1 << arch.R
if len(words) != 2 {
return "", Prerror{"Wrong arguments number"}
}
result := ""
for i := 0; i < reg_num; i++ {
if words[0] == strings.ToLower(Get_register_name(i)) {
result += zeros_prefix(int(arch.R), get_binary(i))
break
}
}
if result == "" {
return "", Prerror{"Unknown register name " + words[0]}
}
partial := ""
for i := 0; i < reg_num; i++ {
if words[1] == strings.ToLower(Get_register_name(i)) {
partial += zeros_prefix(int(arch.R), get_binary(i))
break
}
}
if partial == "" {
return "", Prerror{"Unknown register name " + words[1]}
}
result += partial
for i := opbits + 2*int(arch.R); i < rom_word; i++ {
result += "0"
}
return result, nil
}
func (op Sub) Disassembler(arch *Arch, instr string) (string, error) {
reg_id := get_id(instr[:arch.R])
result := strings.ToLower(Get_register_name(reg_id)) + " "
reg_id = get_id(instr[arch.R : 2*int(arch.R)])
result += strings.ToLower(Get_register_name(reg_id))
return result, nil
}
// The simulation does nothing
func (op Sub) Simulate(vm *VM, instr string) error {
// TODO
vm.Pc = vm.Pc + 1
return nil
}
// The random genaration does nothing
func (op Sub) Generate(arch *Arch) string {
// TODO
return ""
}
func (op Sub) Required_shared() (bool, []string) {
// TODO
return false, []string{}
}
func (op Sub) Required_modes() (bool, []string) {
return false, []string{}
}
func (op Sub) Forbidden_modes() (bool, []string) {
return false, []string{}
}
func (op Sub) Op_instruction_internal_state(arch *Arch, flavor string) string {
return ""
}
func (Op Sub) Op_instruction_verilog_reset(arch *Arch, flavor string) string {
return ""
}
func (Op Sub) Op_instruction_verilog_default_state(arch *Arch, flavor string) string {
return ""
}
func (Op Sub) Op_instruction_verilog_internal_state(arch *Arch, flavor string) string {
return ""
}
func (Op Sub) Op_instruction_verilog_extra_modules(arch *Arch, flavor string) ([]string, []string) {
return []string{}, []string{}
}
func (Op Sub) AbstractAssembler(arch *Arch, words []string) ([]UsageNotify, error) {
result := make([]UsageNotify, 0)
return result, nil
}
func (Op Sub) Op_instruction_verilog_extra_block(arch *Arch, flavor string, level uint8, blockname string, objects []string) string {
result := ""
switch blockname {
default:
result = ""
}
return result
}
func (Op Sub) HLAssemblerMatch(arch *Arch) []string {
result := make([]string, 0)
return result
}
func (Op Sub) HLAssemblerNormalize(arch *Arch, rg *bmreqs.ReqRoot, node string, line *bmline.BasmLine) (*bmline.BasmLine, error) {
return nil, errors.New("HL Assembly normalize failed")
}
func (Op Sub) ExtraFiles(arch *Arch) ([]string, []string) {
return []string{}, []string{}
}
func (Op Sub) HLAssemblerInstructionMetadata(arch *Arch, line *bmline.BasmLine) (*bmmeta.BasmMeta, error) {
return nil, nil
}