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[FAST486]

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Implement BSF, BSR and MOVSX.


svn path=/branches/ntvdm/; revision=60877
This commit is contained in:
Aleksandar Andrejevic 2013-11-07 00:57:08 +00:00
parent 248dda401d
commit 01c10ef5aa
2 changed files with 254 additions and 4 deletions
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254
lib/fast486/extraops.c
View file

@ -225,10 +225,10 @@ Fast486ExtendedHandlers[FAST486_NUM_OPCODE_HANDLERS] =
Fast486OpcodeGroup0FB9,
Fast486OpcodeGroup0FBA,
Fast486ExtOpcodeBtc,
NULL, // TODO: OPCODE 0xBC NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xBD NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xBE NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xBF NOT IMPLEMENTED
Fast486ExtOpcodeBsf,
Fast486ExtOpcodeBsr,
Fast486ExtOpcodeMovsxByte,
Fast486ExtOpcodeMovsxWord,
Fast486ExtOpcodeXaddByte,
Fast486ExtOpcodeXadd,
NULL, // Invalid
@ -1036,6 +1036,252 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtc)
return TRUE;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBsf)
{
INT i;
ULONG Dummy = 0, Value = 0;
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
ULONG BitNumber;
UINT DataSize;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xBC);
/* Get the number of bits */
if (OperandSize) DataSize = 32;
else DataSize = 16;
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
/* Read the value */
if (OperandSize)
{
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Dummy, &Value))
{
/* Exception occurred */
return FALSE;
}
}
else
{
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
(PUSHORT)&Dummy,
(PUSHORT)&Value))
{
/* Exception occurred */
return FALSE;
}
}
/* Clear ZF */
State->Flags.Zf = FALSE;
for (i = 0; i < DataSize; i++)
{
if(Value & (1 << i))
{
/* Set ZF */
State->Flags.Zf = TRUE;
/* Save the bit number */
BitNumber = i;
/* Exit the loop */
break;
}
}
if (State->Flags.Zf)
{
/* Write back the result */
if (OperandSize)
{
if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, BitNumber))
{
/* Exception occurred */
return FALSE;
}
}
else
{
if (!Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(BitNumber)))
{
/* Exception occurred */
return FALSE;
}
}
}
return TRUE;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBsr)
{
INT i;
ULONG Dummy = 0, Value = 0;
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
ULONG BitNumber;
UINT DataSize;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xBD);
/* Get the number of bits */
if (OperandSize) DataSize = 32;
else DataSize = 16;
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
/* Read the value */
if (OperandSize)
{
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Dummy, &Value))
{
/* Exception occurred */
return FALSE;
}
}
else
{
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
(PUSHORT)&Dummy,
(PUSHORT)&Value))
{
/* Exception occurred */
return FALSE;
}
}
/* Clear ZF */
State->Flags.Zf = FALSE;
for (i = DataSize - 1; i >= 0; i--)
{
if(Value & (1 << i))
{
/* Set ZF */
State->Flags.Zf = TRUE;
/* Save the bit number */
BitNumber = i;
/* Exit the loop */
break;
}
}
if (State->Flags.Zf)
{
/* Write back the result */
if (OperandSize)
{
if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, BitNumber))
{
/* Exception occurred */
return FALSE;
}
}
else
{
if (!Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(BitNumber)))
{
/* Exception occurred */
return FALSE;
}
}
}
return TRUE;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovsxByte)
{
UCHAR Dummy;
CHAR Value;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_MOD_REG_RM ModRegRm;
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xBE);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
/* Read the operands */
if (!Fast486ReadModrmByteOperands(State, &ModRegRm, &Dummy, (PUCHAR)&Value))
{
/* Exception occurred */
return FALSE;
}
/* Write back the sign-extended value */
return Fast486WriteModrmDwordOperands(State,
&ModRegRm,
TRUE,
(ULONG)((LONG)Value));
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovsxWord)
{
USHORT Dummy;
SHORT Value;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_MOD_REG_RM ModRegRm;
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xBF);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
/* Read the operands */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Dummy, (PUSHORT)&Value))
{
/* Exception occurred */
return FALSE;
}
/* Write back the sign-extended value */
return Fast486WriteModrmDwordOperands(State,
&ModRegRm,
TRUE,
(ULONG)((LONG)Value));
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalJmp)
{
BOOLEAN Jump = FALSE;

4
lib/fast486/extraops.h
View file

@ -41,6 +41,10 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchgByte);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchg);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtr);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtc);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBsf);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBsr);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovsxByte);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovsxWord);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalJmp);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalSet);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXaddByte);