133 lines
2.8 KiB
C++
133 lines
2.8 KiB
C++
#include "cpu/utility.hh"
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#include <cstdint>
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#include <variant>
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template<class... Ts>
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struct overloaded : Ts... {
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using Ts::operator()...;
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};
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template<class... Ts>
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overloaded(Ts...) -> overloaded<Ts...>;
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class ArmInstruction {
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public:
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ArmInstruction() = delete;
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ArmInstruction(uint32_t insn);
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auto get_condition() const { return condition; }
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auto get_data() const { return data; }
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std::string disassemble();
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struct BranchAndExchange {
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uint8_t rn;
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};
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struct Branch {
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bool link;
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uint32_t offset;
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};
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struct Multiply {
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uint8_t rm;
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uint8_t rs;
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uint8_t rn;
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uint8_t rd;
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bool set;
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bool acc;
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};
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struct MultiplyLong {
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uint8_t rm;
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uint8_t rs;
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uint8_t rdlo;
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uint8_t rdhi;
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bool set;
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bool acc;
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bool uns;
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};
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struct SingleDataSwap {
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uint8_t rm;
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uint8_t rd;
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uint8_t rn;
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bool byte;
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};
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struct SingleDataTransfer {
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std::variant<uint16_t, Shift> offset;
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uint8_t rd;
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uint8_t rn;
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bool load;
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bool write;
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bool byte;
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bool up;
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bool pre;
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};
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struct HalfwordTransfer {
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uint8_t offset;
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bool half;
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bool sign;
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uint8_t rd;
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uint8_t rn;
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bool load;
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bool write;
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bool byte;
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bool imm;
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bool up;
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bool pre;
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};
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struct CoprocessorDataTransfer {
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uint8_t offset;
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uint8_t cpn;
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uint8_t crd;
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uint8_t rn;
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bool load;
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bool write;
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bool len;
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bool up;
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bool pre;
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};
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struct CoprocessorDataOperation {
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uint8_t crm;
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uint8_t cp;
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uint8_t cpn;
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uint8_t crd;
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uint8_t crn;
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uint8_t cp_opc;
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};
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struct CoprocessorRegisterTransfer {
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uint8_t crm;
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uint8_t cp;
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uint8_t cpn;
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uint8_t rd;
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uint8_t crn;
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bool load;
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uint8_t cp_opc;
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};
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struct Undefined {};
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struct SoftwareInterrupt {};
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using InstructionData = std::variant<BranchAndExchange,
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Branch,
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Multiply,
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MultiplyLong,
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SingleDataSwap,
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SingleDataTransfer,
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HalfwordTransfer,
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CoprocessorDataTransfer,
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CoprocessorDataOperation,
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CoprocessorRegisterTransfer,
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Undefined,
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SoftwareInterrupt>;
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private:
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Condition condition;
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InstructionData data;
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};
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