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[SOFT386]

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Implement opcode group 0x80. Group 0x82 is just an alias to group 0x80.


svn path=/branches/ntvdm/; revision=60450
This commit is contained in:
Aleksandar Andrejevic 2013-09-29 15:04:43 +00:00
parent abf9647dd9
commit 9331ef28b9
3 changed files with 140 additions and 13 deletions
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4
lib/soft386/opcodes.c
View file

@ -154,9 +154,9 @@ Soft386OpcodeHandlers[SOFT386_NUM_OPCODE_HANDLERS] =
Soft386OpcodeShortConditionalJmp,
Soft386OpcodeShortConditionalJmp,
Soft386OpcodeShortConditionalJmp,
Soft386OpcodeGroup80,
Soft386OpcodeGroup8082,
Soft386OpcodeGroup81,
Soft386OpcodeGroup82,
Soft386OpcodeGroup8082,
Soft386OpcodeGroup83,
Soft386OpcodeTestByteModrm,
Soft386OpcodeTestModrm,

146
lib/soft386/opgroups.c
View file

@ -21,10 +21,144 @@
/* PUBLIC FUNCTIONS ***********************************************************/
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup80)
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup8082)
{
UNIMPLEMENTED;
return FALSE; // TODO: NOT IMPLEMENTED
UCHAR Immediate, Result, Dummy, Value;
SOFT386_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
{
/* The ADSIZE prefix toggles the size */
AddressSize = !AddressSize;
}
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
/* Fetch the immediate operand */
if (!Soft386FetchByte(State, &Immediate))
{
/* Exception occurred */
return FALSE;
}
/* Read the operands */
if (!Soft386ReadModrmByteOperands(State, &ModRegRm, &Dummy, &Value))
{
/* Exception occurred */
return FALSE;
}
/* Check which operation is this */
switch (ModRegRm.Register)
{
/* ADD */
case 0:
{
Result = Value + Immediate;
/* Update CF, OF and AF */
State->Flags.Cf = (Result < Value) && (Result < Immediate);
State->Flags.Of = ((Value & SIGN_FLAG_BYTE) == (Immediate & SIGN_FLAG_BYTE))
&& ((Value & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = (((Value & 0x0F) + (Immediate & 0x0F)) & 0x10) ? TRUE : FALSE;
break;
}
/* OR */
case 1:
{
Result = Value | Immediate;
break;
}
/* ADC */
case 2:
{
INT Carry = State->Flags.Cf ? 1 : 0;
Result = Value + Immediate + Carry;
/* Update CF, OF and AF */
State->Flags.Cf = ((Immediate == 0xFF) && (Carry == 1))
|| ((Result < Value) && (Result < (Immediate + Carry)));
State->Flags.Of = ((Value & SIGN_FLAG_BYTE) == (Immediate & SIGN_FLAG_BYTE))
&& ((Value & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = (((Value & 0x0F) + ((Immediate + Carry) & 0x0F)) & 0x10)
? TRUE : FALSE;
break;
}
/* SBB */
case 3:
{
INT Carry = State->Flags.Cf ? 1 : 0;
Result = Value - Immediate - Carry;
/* Update CF, OF and AF */
State->Flags.Cf = Value < (Immediate + Carry);
State->Flags.Of = ((Value & SIGN_FLAG_BYTE) != (Immediate & SIGN_FLAG_BYTE))
&& ((Value & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = (Value & 0x0F) < ((Immediate + Carry) & 0x0F);
break;
}
/* AND */
case 4:
{
Result = Value & Immediate;
break;
}
/* SUB or CMP */
case 5:
case 7:
{
Result = Value - Immediate;
/* Update CF, OF and AF */
State->Flags.Cf = Value < Immediate;
State->Flags.Of = ((Value & SIGN_FLAG_BYTE) != (Immediate & SIGN_FLAG_BYTE))
&& ((Value & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = (Value & 0x0F) < (Immediate & 0x0F);
break;
}
/* XOR */
case 6:
{
Value ^= Immediate;
break;
}
default:
{
/* Shouldn't happen */
ASSERT(FALSE);
}
}
/* Update ZF, SF and PF */
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
State->Flags.Sf = (Result & SIGN_FLAG_BYTE) ? TRUE : FALSE;
State->Flags.Pf = Soft386CalculateParity(Result);
/* Unless this is CMP, write back the result */
if (ModRegRm.Register != 7)
{
return Soft386WriteModrmByteOperands(State, &ModRegRm, FALSE, Result);
}
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup81)
@ -33,12 +167,6 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup81)
return FALSE; // TODO: NOT IMPLEMENTED
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup82)
{
UNIMPLEMENTED;
return FALSE; // TODO: NOT IMPLEMENTED
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup83)
{
UNIMPLEMENTED;

3
lib/soft386/opgroups.h
View file

@ -11,9 +11,8 @@
/* DEFINES ********************************************************************/
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup80);
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup8082);
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup81);
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup82);
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup83);
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup8F);
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupC0);