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Decode MOVEC.

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This commit is contained in:
Thomas Harte 2022-10-26 12:50:15 -04:00
parent c1f0eed0a3
commit ae2419e283
3 changed files with 20 additions and 1 deletions
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15
InstructionSets/M68k/Decoder.cpp
View File

@ -507,6 +507,11 @@ template <typename Predecoder<model>::OpT op> uint32_t Predecoder<model>::invali
return ~OneOperandMask<
AlterableAddressingModesNoAn
>::value;
case OpT(Operation::MOVEfromC): case OpT(Operation::MOVEtoC):
return ~OneOperandMask<
Ext
>::value;
}
//
@ -1003,6 +1008,14 @@ template <typename Predecoder<model>::OpT op, bool validate> Preinstruction Pred
//
case OpT(Operation::MOVEfromCCR):
return validated<op, validate>(combined_mode(ea_mode, ea_register), ea_register);
//
// MARK: MOVE to/from C.
//
// No further information in the instruction, but an extension word is required.
//
case OpT(Operation::MOVEfromC): case OpT(Operation::MOVEtoC):
return validated<op, validate>(AddressingMode::ExtensionWord);
}
//
@ -1289,6 +1302,8 @@ Preinstruction Predecoder<model>::decode4(uint16_t instruction) {
case 0xe75: Decode(Op::RTS); // 4-169 (p273)
case 0xe76: Decode(Op::TRAPV); // 4-191 (p295)
case 0xe77: Decode(Op::RTR); // 4-168 (p272)
case 0xe7a: DecodeReq(model >= Model::M68010, Op::MOVEtoC); // 6-22 (p476)
case 0xe7b: DecodeReq(model >= Model::M68010, Op::MOVEfromC); // 6-22 (p476)
default: break;
}

2
InstructionSets/M68k/Instruction.cpp
View File

@ -105,6 +105,8 @@ const char *_to_string(Operation operation, bool is_quick) {
case Operation::MOVEfromCCR: return "MOVEfromCCR";
case Operation::MOVEtoUSP: return "MOVEtoUSP";
case Operation::MOVEfromUSP: return "MOVEfromUSP";
case Operation::MOVEtoC: return "MOVEtoC";
case Operation::MOVEfromC: return "MOVEfromC";
case Operation::ORItoSR: return "ORItoSR";
case Operation::ORItoCCR: return "ORItoCCR";

4
InstructionSets/M68k/Instruction.hpp
View File

@ -110,7 +110,8 @@ enum class Operation: uint8_t {
//
MOVEfromCCR,
MOVEC, MOVES,
MOVEtoC, MOVEfromC,
MOVES,
BKPT, RTD,
//
@ -205,6 +206,7 @@ constexpr bool requires_supervisor(Operation op) {
case Operation::EORItoSR: case Operation::RTE:
case Operation::RESET: case Operation::STOP:
case Operation::MOVEtoUSP: case Operation::MOVEfromUSP:
case Operation::MOVEtoC: case Operation::MOVEfromC:
case Operation::MOVEtoSR:
return true;