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[SOFT386]

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Implement MOV (mod-reg-r/m).


svn path=/branches/ntvdm/; revision=60136
This commit is contained in:
Aleksandar Andrejevic 2013-09-15 15:30:55 +00:00
parent 5439ace9d6
commit e1e34dc171
1 changed files with 128 additions and 6 deletions
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130
lib/soft386/opcodes.c
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@ -3665,20 +3665,142 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeImulModrmByteImm)
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovByteModrm)
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
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 & 0xFD) == 0x88);
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;
}
if (Opcode & SOFT386_OPCODE_WRITE_REG) Result = SecondValue;
else Result = FirstValue;
/* Write back the result */
return Soft386WriteModrmByteOperands(State,
&ModRegRm,
Opcode & SOFT386_OPCODE_WRITE_REG,
Result);
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovModrm)
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
SOFT386_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x89);
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;
}
if (Opcode & SOFT386_OPCODE_WRITE_REG) Result = SecondValue;
else Result = FirstValue;
/* Write back the result */
return Soft386WriteModrmDwordOperands(State,
&ModRegRm,
Opcode & SOFT386_OPCODE_WRITE_REG,
Result);
}
else
{
USHORT FirstValue, SecondValue, Result;
if (!Soft386ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return FALSE;
}
if (Opcode & SOFT386_OPCODE_WRITE_REG) Result = SecondValue;
else Result = FirstValue;
/* Write back the result */
return Soft386WriteModrmWordOperands(State,
&ModRegRm,
Opcode & SOFT386_OPCODE_WRITE_REG,
Result);
}
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovStoreSeg)
{
// TODO: NOT IMPLEMENTED