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[SOFT386]

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Implement the TEST instruction, and the XCHG instruction which uses MOD-REG-R/M for operands.


svn path=/branches/ntvdm/; revision=59994
This commit is contained in:
Aleksandar Andrejevic 2013-09-05 23:48:07 +00:00
parent a25c3f44b6
commit ddcbb9ee92
2 changed files with 324 additions and 0 deletions
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320
lib/soft386/opcodes.c
View file

@ -2290,3 +2290,323 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeXorEax)
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeTestByteModrm)
{
UCHAR FirstValue, SecondValue, Result;
SOFT386_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x84);
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
{
/* The ADSIZE prefix toggles the size */
AddressSize = !AddressSize;
}
else if (State->PrefixFlags
& ~(SOFT386_PREFIX_ADSIZE
| SOFT386_PREFIX_SEG
| SOFT386_PREFIX_LOCK))
{
/* Invalid prefix */
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
/* Get the operands */
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
if (!Soft386ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
State->Flags.Sf = (Result & SIGN_FLAG_BYTE) ? TRUE : FALSE;
State->Flags.Pf = Soft386CalculateParity(Result);
/* The result is discarded */
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeTestModrm)
{
SOFT386_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x85);
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
{
/* The ADSIZE prefix toggles the address size */
AddressSize = !AddressSize;
}
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the operand size */
OperandSize = !OperandSize;
}
if (State->PrefixFlags
& ~(SOFT386_PREFIX_ADSIZE
| SOFT386_PREFIX_OPSIZE
| SOFT386_PREFIX_SEG
| SOFT386_PREFIX_LOCK))
{
/* Invalid prefix */
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
/* Get the operands */
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue, Result;
if (!Soft386ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
State->Flags.Sf = (Result & SIGN_FLAG_LONG) ? TRUE : FALSE;
State->Flags.Pf = Soft386CalculateParity(Result);
}
else
{
USHORT FirstValue, SecondValue, Result;
if (!Soft386ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
State->Flags.Sf = (Result & SIGN_FLAG_LONG) ? TRUE : FALSE;
State->Flags.Pf = Soft386CalculateParity(Result);
}
/* The result is discarded */
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeXchgByteModrm)
{
UCHAR FirstValue, SecondValue;
SOFT386_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x86);
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
{
/* The ADSIZE prefix toggles the size */
AddressSize = !AddressSize;
}
else if (State->PrefixFlags
& ~(SOFT386_PREFIX_ADSIZE
| SOFT386_PREFIX_SEG
| SOFT386_PREFIX_LOCK))
{
/* Invalid prefix */
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
/* Get the operands */
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
if (!Soft386ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return FALSE;
}
/* Write the value from the register to the R/M */
if (!Soft386WriteModrmByteOperands(State,
&ModRegRm,
FALSE,
FirstValue))
{
/* Exception occurred */
return FALSE;
}
/* Write the value from the R/M to the register */
if (!Soft386WriteModrmByteOperands(State,
&ModRegRm,
TRUE,
SecondValue))
{
/* Exception occurred */
return FALSE;
}
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeXchgModrm)
{
SOFT386_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x87);
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
{
/* The ADSIZE prefix toggles the address size */
AddressSize = !AddressSize;
}
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the operand size */
OperandSize = !OperandSize;
}
if (State->PrefixFlags
& ~(SOFT386_PREFIX_ADSIZE
| SOFT386_PREFIX_OPSIZE
| SOFT386_PREFIX_SEG
| SOFT386_PREFIX_LOCK))
{
/* Invalid prefix */
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
/* Get the operands */
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue;
if (!Soft386ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return FALSE;
}
/* Write the value from the register to the R/M */
if (!Soft386WriteModrmDwordOperands(State,
&ModRegRm,
FALSE,
FirstValue))
{
/* Exception occurred */
return FALSE;
}
/* Write the value from the R/M to the register */
if (!Soft386WriteModrmDwordOperands(State,
&ModRegRm,
TRUE,
SecondValue))
{
/* Exception occurred */
return FALSE;
}
}
else
{
USHORT FirstValue, SecondValue;
if (!Soft386ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return FALSE;
}
/* Write the value from the register to the R/M */
if (!Soft386WriteModrmWordOperands(State,
&ModRegRm,
FALSE,
FirstValue))
{
/* Exception occurred */
return FALSE;
}
/* Write the value from the R/M to the register */
if (!Soft386WriteModrmWordOperands(State,
&ModRegRm,
TRUE,
SecondValue))
{
/* Exception occurred */
return FALSE;
}
}
/* The result is discarded */
return TRUE;
}

4
lib/soft386/opcodes.h
View file

@ -66,5 +66,9 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeXorByteModrm);
SOFT386_OPCODE_HANDLER(Soft386OpcodeXorModrm);
SOFT386_OPCODE_HANDLER(Soft386OpcodeXorAl);
SOFT386_OPCODE_HANDLER(Soft386OpcodeXorEax);
SOFT386_OPCODE_HANDLER(Soft386OpcodeTestByteModrm);
SOFT386_OPCODE_HANDLER(Soft386OpcodeTestModrm);
SOFT386_OPCODE_HANDLER(Soft386OpcodeXchgByteModrm);
SOFT386_OPCODE_HANDLER(Soft386OpcodeXchgModrm);
#endif // _OPCODES_H_