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[SOFT386]
Implement the REP prefix for OUTS, LODS and STOS. svn path=/branches/ntvdm/; revision=60616
This commit is contained in:
Aleksandar Andrejevic
parent
20486fd1b7
commit
caf9a0a671
1 changed files with 213 additions and 65 deletions
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@ -6122,40 +6122,106 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeStos)
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AddressSize = !AddressSize;
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}
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if ((State->PrefixFlags & SOFT386_PREFIX_REP)
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|| (State->PrefixFlags & SOFT386_PREFIX_REPNZ))
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{
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// TODO: The REP/REPZ/REPNZ prefixes need to be implemented!
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Soft386Exception(State, SOFT386_EXCEPTION_UD);
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return FALSE;
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}
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/* Calculate the size */
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if (Opcode == 0xAA) DataSize = sizeof(UCHAR);
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else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
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/* Write to the destination operand */
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if (!Soft386WriteMemory(State,
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SOFT386_REG_ES,
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AddressSize ? State->GeneralRegs[SOFT386_REG_EDI].Long
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: State->GeneralRegs[SOFT386_REG_EDI].LowWord,
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&State->GeneralRegs[SOFT386_REG_EAX].Long,
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DataSize))
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if (State->PrefixFlags & SOFT386_PREFIX_REP)
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{
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/* Exception occurred */
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return FALSE;
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}
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UCHAR Block[STRING_BLOCK_SIZE];
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ULONG Count = OperandSize ? State->GeneralRegs[SOFT386_REG_ECX].Long
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: State->GeneralRegs[SOFT386_REG_ECX].LowWord;
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/* Increment/decrement EDI */
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if (OperandSize)
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{
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if (State->Flags.Df) State->GeneralRegs[SOFT386_REG_EDI].Long += DataSize;
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else State->GeneralRegs[SOFT386_REG_EDI].Long -= DataSize;
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/* Fill the memory block with the data */
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if (DataSize == sizeof(UCHAR))
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{
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RtlFillMemory(Block, State->GeneralRegs[SOFT386_REG_EAX].LowByte, sizeof(Block));
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}
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else
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{
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ULONG i;
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for (i = 0; i < STRING_BLOCK_SIZE / DataSize; i++)
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{
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if (DataSize == sizeof(USHORT))
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{
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((PUSHORT)Block)[i] = State->GeneralRegs[SOFT386_REG_EAX].LowWord;
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}
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else
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{
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((PULONG)Block)[i] = State->GeneralRegs[SOFT386_REG_EAX].Long;
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}
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}
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}
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/* Transfer until finished */
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while (Count)
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{
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ULONG Processed = min(Count, STRING_BLOCK_SIZE / DataSize);
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if (State->Flags.Df)
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{
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/* Reduce EDI by the number of bytes to transfer */
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if (AddressSize) State->GeneralRegs[SOFT386_REG_EDI].Long -= Processed * DataSize;
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else State->GeneralRegs[SOFT386_REG_EDI].LowWord -= Processed * DataSize;
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}
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/* Write to memory */
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if (!Soft386WriteMemory(State,
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SOFT386_REG_ES,
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AddressSize ? State->GeneralRegs[SOFT386_REG_EDI].Long
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: State->GeneralRegs[SOFT386_REG_EDI].LowWord,
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Block,
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Processed * DataSize))
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{
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/* Set ECX */
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if (OperandSize) State->GeneralRegs[SOFT386_REG_ECX].Long = Count;
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else State->GeneralRegs[SOFT386_REG_ECX].LowWord = LOWORD(Count);
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/* Exception occurred */
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return FALSE;
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}
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if (!State->Flags.Df)
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{
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/* Increase EDI by the number of bytes transfered */
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if (AddressSize) State->GeneralRegs[SOFT386_REG_EDI].Long += Processed * DataSize;
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else State->GeneralRegs[SOFT386_REG_EDI].LowWord += Processed * DataSize;
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}
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/* Reduce the total count by the number processed in this run */
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Count -= Processed;
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}
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/* Clear ECX */
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if (OperandSize) State->GeneralRegs[SOFT386_REG_ECX].Long = 0;
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else State->GeneralRegs[SOFT386_REG_ECX].LowWord = 0;
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}
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else
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{
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if (State->Flags.Df) State->GeneralRegs[SOFT386_REG_EDI].LowWord += DataSize;
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else State->GeneralRegs[SOFT386_REG_EDI].LowWord -= DataSize;
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/* Write to the destination operand */
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if (!Soft386WriteMemory(State,
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SOFT386_REG_ES,
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AddressSize ? State->GeneralRegs[SOFT386_REG_EDI].Long
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: State->GeneralRegs[SOFT386_REG_EDI].LowWord,
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&State->GeneralRegs[SOFT386_REG_EAX].Long,
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DataSize))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Increment/decrement EDI */
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if (OperandSize)
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{
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if (State->Flags.Df) State->GeneralRegs[SOFT386_REG_EDI].Long += DataSize;
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else State->GeneralRegs[SOFT386_REG_EDI].Long -= DataSize;
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}
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else
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{
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if (State->Flags.Df) State->GeneralRegs[SOFT386_REG_EDI].LowWord += DataSize;
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else State->GeneralRegs[SOFT386_REG_EDI].LowWord -= DataSize;
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}
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}
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/* Return success */
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@ -6184,18 +6250,31 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeLods)
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AddressSize = !AddressSize;
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}
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if ((State->PrefixFlags & SOFT386_PREFIX_REP)
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|| (State->PrefixFlags & SOFT386_PREFIX_REPNZ))
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{
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// TODO: The REP/REPZ/REPNZ prefixes need to be implemented!
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Soft386Exception(State, SOFT386_EXCEPTION_UD);
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return FALSE;
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}
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/* Calculate the size */
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if (Opcode == 0xAC) DataSize = sizeof(UCHAR);
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else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
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if (State->PrefixFlags & SOFT386_PREFIX_REP)
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{
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ULONG Count = OperandSize ? State->GeneralRegs[SOFT386_REG_ECX].Long
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: State->GeneralRegs[SOFT386_REG_ECX].LowWord;
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/* If the count is 0, do nothing */
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if (Count == 0) return TRUE;
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/* Only the last entry will be loaded */
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if (!State->Flags.Df)
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{
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if (AddressSize) State->GeneralRegs[SOFT386_REG_ESI].Long += (Count - 1) * DataSize;
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else State->GeneralRegs[SOFT386_REG_ESI].LowWord += (Count - 1) * DataSize;
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}
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else
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{
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if (AddressSize) State->GeneralRegs[SOFT386_REG_ESI].Long -= (Count - 1) * DataSize;
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else State->GeneralRegs[SOFT386_REG_ESI].LowWord -= (Count - 1) * DataSize;
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}
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}
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/* Read from the source operand */
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if (!Soft386ReadMemory(State,
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SOFT386_REG_DS,
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@ -6448,7 +6527,6 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeIns)
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SOFT386_OPCODE_HANDLER(Soft386OpcodeOuts)
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{
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ULONG Data = 0;
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ULONG DataSize;
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BOOLEAN OperandSize, AddressSize;
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@ -6469,47 +6547,117 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeOuts)
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AddressSize = !AddressSize;
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}
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if ((State->PrefixFlags & SOFT386_PREFIX_REP)
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|| (State->PrefixFlags & SOFT386_PREFIX_REPNZ))
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{
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// TODO: The REP/REPZ/REPNZ prefixes need to be implemented!
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Soft386Exception(State, SOFT386_EXCEPTION_UD);
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return FALSE;
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}
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/* Calculate the size */
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if (Opcode == 0x6E) DataSize = sizeof(UCHAR);
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else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
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/* Read from the source operand */
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if (!Soft386ReadMemory(State,
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SOFT386_REG_DS,
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AddressSize ? State->GeneralRegs[SOFT386_REG_ESI].Long
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: State->GeneralRegs[SOFT386_REG_ESI].LowWord,
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FALSE,
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&Data,
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DataSize))
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if (State->PrefixFlags & SOFT386_PREFIX_REP)
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{
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/* Exception occurred */
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return FALSE;
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}
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UCHAR Block[STRING_BLOCK_SIZE];
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ULONG Count = OperandSize ? State->GeneralRegs[SOFT386_REG_ECX].Long
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: State->GeneralRegs[SOFT386_REG_ECX].LowWord;
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/* Write to the I/O port */
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State->IoWriteCallback(State,
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State->GeneralRegs[SOFT386_REG_EDX].LowWord,
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&Data,
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DataSize);
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/* Clear the memory block */
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RtlZeroMemory(Block, sizeof(Block));
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/* Increment/decrement ESI */
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if (OperandSize)
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{
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if (State->Flags.Df) State->GeneralRegs[SOFT386_REG_ESI].Long += DataSize;
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else State->GeneralRegs[SOFT386_REG_ESI].Long -= DataSize;
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/* Transfer until finished */
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while (Count)
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{
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ULONG Processed = min(Count, STRING_BLOCK_SIZE / DataSize);
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/* Read from memory */
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if (!Soft386ReadMemory(State,
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SOFT386_REG_ES,
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AddressSize ? State->GeneralRegs[SOFT386_REG_EDI].Long
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: State->GeneralRegs[SOFT386_REG_EDI].LowWord,
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FALSE,
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Block,
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Processed * DataSize))
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{
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/* Set ECX */
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if (OperandSize) State->GeneralRegs[SOFT386_REG_ECX].Long = Count;
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else State->GeneralRegs[SOFT386_REG_ECX].LowWord = LOWORD(Count);
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/* Exception occurred */
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return FALSE;
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}
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if (State->Flags.Df)
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{
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ULONG i, j;
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/* Reduce EDI by the number of bytes to transfer */
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if (AddressSize) State->GeneralRegs[SOFT386_REG_EDI].Long -= Processed * DataSize;
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else State->GeneralRegs[SOFT386_REG_EDI].LowWord -= Processed * DataSize;
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/* Reverse the block data */
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for (i = 0; i < Processed / 2; i++)
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{
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/* Swap the values */
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for (j = 0; j < DataSize; j++)
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{
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UCHAR Temp = Block[i * DataSize + j];
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Block[i * DataSize + j] = Block[(Processed - i - 1) * DataSize + j];
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Block[(Processed - i - 1) * DataSize + j] = Temp;
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}
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}
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}
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/* Write to the I/O port */
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State->IoWriteCallback(State,
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State->GeneralRegs[SOFT386_REG_EDX].LowWord,
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Block,
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Processed * DataSize);
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if (!State->Flags.Df)
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{
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/* Increase EDI by the number of bytes transfered */
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if (AddressSize) State->GeneralRegs[SOFT386_REG_EDI].Long += Processed * DataSize;
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else State->GeneralRegs[SOFT386_REG_EDI].LowWord += Processed * DataSize;
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}
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/* Reduce the total count by the number processed in this run */
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Count -= Processed;
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}
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/* Clear ECX */
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if (OperandSize) State->GeneralRegs[SOFT386_REG_ECX].Long = 0;
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else State->GeneralRegs[SOFT386_REG_ECX].LowWord = 0;
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}
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else
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{
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if (State->Flags.Df) State->GeneralRegs[SOFT386_REG_ESI].LowWord += DataSize;
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else State->GeneralRegs[SOFT386_REG_ESI].LowWord -= DataSize;
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ULONG Data = 0;
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/* Read from the source operand */
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if (!Soft386ReadMemory(State,
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SOFT386_REG_DS,
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AddressSize ? State->GeneralRegs[SOFT386_REG_ESI].Long
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: State->GeneralRegs[SOFT386_REG_ESI].LowWord,
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FALSE,
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&Data,
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DataSize))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Write to the I/O port */
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State->IoWriteCallback(State,
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State->GeneralRegs[SOFT386_REG_EDX].LowWord,
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&Data,
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DataSize);
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/* Increment/decrement ESI */
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if (OperandSize)
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{
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if (State->Flags.Df) State->GeneralRegs[SOFT386_REG_ESI].Long += DataSize;
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else State->GeneralRegs[SOFT386_REG_ESI].Long -= DataSize;
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}
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else
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{
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if (State->Flags.Df) State->GeneralRegs[SOFT386_REG_ESI].LowWord += DataSize;
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else State->GeneralRegs[SOFT386_REG_ESI].LowWord -= DataSize;
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}
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}
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/* Return success */
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