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Take a stab at group 8.

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This commit is contained in:
Thomas Harte 2022-03-07 16:34:56 -05:00
parent 0e16e7935e
commit 8e669a32a3
2 changed files with 21 additions and 5 deletions
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17
InstructionSets/x86/Decoder.cpp
View File

@ -524,7 +524,7 @@ std::pair<int, typename Decoder<model>::InstructionT> Decoder<model>::decode(con
RequiresMin(i80386);
MemRegReg(MOVZX, Reg_MemReg, DataSize::Word);
break;
// TODO: 0xba: Grp8 Ev, Ib
case 0xba: RequiresMin(i80386); MemRegReg(Invalid, MemRegBT_to_BTC, data_size_); break;
case 0xbb: RequiresMin(i80386); MemRegReg(BTC, MemReg_Reg, data_size_); break;
case 0xbc: RequiresMin(i80386); MemRegReg(BSF, MemReg_Reg, data_size_); break;
case 0xbd: RequiresMin(i80386); MemRegReg(BSR, MemReg_Reg, data_size_); break;
@ -776,6 +776,21 @@ std::pair<int, typename Decoder<model>::InstructionT> Decoder<model>::decode(con
}
break;
case ModRegRMFormat::MemRegBT_to_BTC:
destination_ = memreg;
source_ = Source::Immediate;
operand_size_ = DataSize::Byte;
switch(reg) {
default: undefined();
case 4: operation_ = Operation::BT; break;
case 5: operation_ = Operation::BTS; break;
case 6: operation_ = Operation::BTR; break;
case 7: operation_ = Operation::BTC; break;
}
break;
default: assert(false);
}

3
InstructionSets/x86/Decoder.hpp
View File

@ -156,7 +156,8 @@ template <Model model> class Decoder {
// 'Group 8'
//
// TODO.
// Parse for mode and register/memory field, populating destination,
// and prepare to read a single byte as source.
MemRegBT_to_BTC,
} modregrm_format_ = ModRegRMFormat::MemReg_Reg;