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[SOFT386]

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Halfplement MOVS, STOS and LODS.
Stubplement CMPS and SCAS.


svn path=/branches/ntvdm/; revision=60515
This commit is contained in:
Aleksandar Andrejevic 2013-10-03 20:56:36 +00:00
parent c2e98bca7f
commit c190ca817c
2 changed files with 275 additions and 10 deletions
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280
lib/soft386/opcodes.c
View file

@ -203,18 +203,18 @@ Soft386OpcodeHandlers[SOFT386_NUM_OPCODE_HANDLERS] =
Soft386OpcodeMovEaxOffset,
Soft386OpcodeMovOffsetAl,
Soft386OpcodeMovOffsetEax,
NULL, // TODO: OPCODE 0xA4 NOT SUPPORTED
NULL, // TODO: OPCODE 0xA5 NOT SUPPORTED
NULL, // TODO: OPCODE 0xA6 NOT SUPPORTED
NULL, // TODO: OPCODE 0xA7 NOT SUPPORTED
Soft386OpcodeMovs,
Soft386OpcodeMovs,
Soft386OpcodeCmps,
Soft386OpcodeCmps,
Soft386OpcodeTestAl,
Soft386OpcodeTestEax,
NULL, // TODO: OPCODE 0xAA NOT SUPPORTED
NULL, // TODO: OPCODE 0xAB NOT SUPPORTED
NULL, // TODO: OPCODE 0xAC NOT SUPPORTED
NULL, // TODO: OPCODE 0xAD NOT SUPPORTED
NULL, // TODO: OPCODE 0xAE NOT SUPPORTED
NULL, // TODO: OPCODE 0xAF NOT SUPPORTED
Soft386OpcodeStos,
Soft386OpcodeStos,
Soft386OpcodeLods,
Soft386OpcodeLods,
Soft386OpcodeScas,
Soft386OpcodeScas,
Soft386OpcodeMovByteRegImm,
Soft386OpcodeMovByteRegImm,
Soft386OpcodeMovByteRegImm,
@ -5606,3 +5606,263 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeSalc)
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovs)
{
ULONG Data, DataSize;
BOOLEAN OperandSize, AddressSize;
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xA4);
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the size */
OperandSize = !OperandSize;
}
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
{
/* The ADSIZE prefix toggles the size */
AddressSize = !AddressSize;
}
if ((State->PrefixFlags & SOFT386_PREFIX_REP)
|| (State->PrefixFlags & SOFT386_PREFIX_REPNZ))
{
// TODO: The REP/REPZ/REPNZ prefixes need to be implemented!
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
/* Calculate the size */
if (Opcode == 0xA4) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
/* Read from the source operand */
if (!Soft386ReadMemory(State,
SOFT386_REG_DS,
AddressSize ? State->GeneralRegs[SOFT386_REG_ESI].Long
: State->GeneralRegs[SOFT386_REG_ESI].LowWord,
FALSE,
&Data,
DataSize))
{
/* Exception occurred */
return FALSE;
}
/* Write to the destination operand */
if (!Soft386WriteMemory(State,
SOFT386_REG_ES,
AddressSize ? State->GeneralRegs[SOFT386_REG_EDI].Long
: State->GeneralRegs[SOFT386_REG_EDI].LowWord,
&Data,
DataSize))
{
/* Exception occurred */
return FALSE;
}
/* Increment/decrement ESI and EDI */
if (OperandSize)
{
if (State->Flags.Df)
{
State->GeneralRegs[SOFT386_REG_ESI].Long += DataSize;
State->GeneralRegs[SOFT386_REG_EDI].Long += DataSize;
}
else
{
State->GeneralRegs[SOFT386_REG_ESI].Long -= DataSize;
State->GeneralRegs[SOFT386_REG_EDI].Long -= DataSize;
}
}
else
{
if (State->Flags.Df)
{
State->GeneralRegs[SOFT386_REG_ESI].LowWord += DataSize;
State->GeneralRegs[SOFT386_REG_EDI].LowWord += DataSize;
}
else
{
State->GeneralRegs[SOFT386_REG_ESI].LowWord -= DataSize;
State->GeneralRegs[SOFT386_REG_EDI].LowWord -= DataSize;
}
}
/* Return success */
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeCmps)
{
UNIMPLEMENTED;
return FALSE; // TODO: NOT IMPLEMENTED
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeStos)
{
ULONG DataSize;
BOOLEAN OperandSize, AddressSize;
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xAA);
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the size */
OperandSize = !OperandSize;
}
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
{
/* The ADSIZE prefix toggles the size */
AddressSize = !AddressSize;
}
if ((State->PrefixFlags & SOFT386_PREFIX_REP)
|| (State->PrefixFlags & SOFT386_PREFIX_REPNZ))
{
// TODO: The REP/REPZ/REPNZ prefixes need to be implemented!
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
/* Calculate the size */
if (Opcode == 0xAA) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
/* Write to the destination operand */
if (!Soft386WriteMemory(State,
SOFT386_REG_ES,
AddressSize ? State->GeneralRegs[SOFT386_REG_EDI].Long
: State->GeneralRegs[SOFT386_REG_EDI].LowWord,
&State->GeneralRegs[SOFT386_REG_EAX].Long,
DataSize))
{
/* Exception occurred */
return FALSE;
}
/* Increment/decrement ESI and EDI */
if (OperandSize)
{
if (State->Flags.Df)
{
State->GeneralRegs[SOFT386_REG_ESI].Long += DataSize;
State->GeneralRegs[SOFT386_REG_EDI].Long += DataSize;
}
else
{
State->GeneralRegs[SOFT386_REG_ESI].Long -= DataSize;
State->GeneralRegs[SOFT386_REG_EDI].Long -= DataSize;
}
}
else
{
if (State->Flags.Df)
{
State->GeneralRegs[SOFT386_REG_ESI].LowWord += DataSize;
State->GeneralRegs[SOFT386_REG_EDI].LowWord += DataSize;
}
else
{
State->GeneralRegs[SOFT386_REG_ESI].LowWord -= DataSize;
State->GeneralRegs[SOFT386_REG_EDI].LowWord -= DataSize;
}
}
/* Return success */
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeLods)
{
ULONG DataSize;
BOOLEAN OperandSize, AddressSize;
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xAC);
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the size */
OperandSize = !OperandSize;
}
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
{
/* The ADSIZE prefix toggles the size */
AddressSize = !AddressSize;
}
if ((State->PrefixFlags & SOFT386_PREFIX_REP)
|| (State->PrefixFlags & SOFT386_PREFIX_REPNZ))
{
// TODO: The REP/REPZ/REPNZ prefixes need to be implemented!
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
/* Calculate the size */
if (Opcode == 0xAC) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
/* Read from the source operand */
if (!Soft386ReadMemory(State,
SOFT386_REG_DS,
AddressSize ? State->GeneralRegs[SOFT386_REG_ESI].Long
: State->GeneralRegs[SOFT386_REG_ESI].LowWord,
FALSE,
&State->GeneralRegs[SOFT386_REG_EAX].Long,
DataSize))
{
/* Exception occurred */
return FALSE;
}
/* Increment/decrement ESI and EDI */
if (OperandSize)
{
if (State->Flags.Df)
{
State->GeneralRegs[SOFT386_REG_ESI].Long += DataSize;
State->GeneralRegs[SOFT386_REG_EDI].Long += DataSize;
}
else
{
State->GeneralRegs[SOFT386_REG_ESI].Long -= DataSize;
State->GeneralRegs[SOFT386_REG_EDI].Long -= DataSize;
}
}
else
{
if (State->Flags.Df)
{
State->GeneralRegs[SOFT386_REG_ESI].LowWord += DataSize;
State->GeneralRegs[SOFT386_REG_EDI].LowWord += DataSize;
}
else
{
State->GeneralRegs[SOFT386_REG_ESI].LowWord -= DataSize;
State->GeneralRegs[SOFT386_REG_EDI].LowWord -= DataSize;
}
}
/* Return success */
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeScas)
{
UNIMPLEMENTED;
return FALSE; // TODO: NOT IMPLEMENTED
}

5
lib/soft386/opcodes.h
View file

@ -148,5 +148,10 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeMovEaxOffset);
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovOffsetAl);
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovOffsetEax);
SOFT386_OPCODE_HANDLER(Soft386OpcodeSalc);
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovs);
SOFT386_OPCODE_HANDLER(Soft386OpcodeCmps);
SOFT386_OPCODE_HANDLER(Soft386OpcodeStos);
SOFT386_OPCODE_HANDLER(Soft386OpcodeLods);
SOFT386_OPCODE_HANDLER(Soft386OpcodeScas);
#endif // _OPCODES_H_