Author: aandrejevic
Date: Tue Oct 1 01:31:36 2013
New Revision: 60487
URL:
http://svn.reactos.org/svn/reactos?rev=60487&view=rev
Log:
[SOFT386]
Halfplement group 0xFF (Only INC/DEC).
Modified:
branches/ntvdm/lib/soft386/opgroups.c
Modified: branches/ntvdm/lib/soft386/opgroups.c
URL:
http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/soft386/opgroups.c?re…
==============================================================================
--- branches/ntvdm/lib/soft386/opgroups.c [iso-8859-1] (original)
+++ branches/ntvdm/lib/soft386/opgroups.c [iso-8859-1] Tue Oct 1 01:31:36 2013
@@ -1058,8 +1058,121 @@
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupFF)
{
- UNIMPLEMENTED;
- return FALSE; // TODO: NOT IMPLEMENTED
+ SOFT386_MOD_REG_RM ModRegRm;
+ BOOLEAN OperandSize, AddressSize;
+
+ OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
+
+ 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 (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ if (ModRegRm.Register == 7)
+ {
+ /* Invalid */
+ Soft386Exception(State, SOFT386_EXCEPTION_UD);
+ return FALSE;
+ }
+
+ /* Read the operands */
+ if (OperandSize)
+ {
+ ULONG Dummy, Value;
+
+ if (!Soft386ReadModrmDwordOperands(State, &ModRegRm, &Dummy,
&Value))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ if (ModRegRm.Register == 0)
+ {
+ /* Increment and update OF */
+ Value++;
+ State->Flags.Of = (Value == SIGN_FLAG_LONG) ? TRUE : FALSE;
+ }
+ else if (ModRegRm.Register == 1)
+ {
+ /* Decrement and update OF */
+ State->Flags.Of = (Value == SIGN_FLAG_LONG) ? TRUE : FALSE;
+ Value--;
+ }
+
+ if (ModRegRm.Register <= 1)
+ {
+ /* Update flags */
+ State->Flags.Sf = (Value & SIGN_FLAG_LONG) ? TRUE : FALSE;
+ State->Flags.Zf = (Value == 0) ? TRUE : FALSE;
+ State->Flags.Af = ((Value & 0x0F) == 0) ? TRUE : FALSE;
+ State->Flags.Pf = Soft386CalculateParity(Value);
+
+ /* Write back the result */
+ return Soft386WriteModrmDwordOperands(State,
+ &ModRegRm,
+ FALSE,
+ Value);
+ }
+ }
+ else
+ {
+ USHORT Dummy, Value;
+
+ if (!Soft386ReadModrmWordOperands(State, &ModRegRm, &Dummy, &Value))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ if (ModRegRm.Register == 0)
+ {
+ /* Increment and update OF */
+ Value++;
+ State->Flags.Of = (Value == SIGN_FLAG_WORD) ? TRUE : FALSE;
+ }
+ else if (ModRegRm.Register == 1)
+ {
+ /* Decrement and update OF */
+ State->Flags.Of = (Value == SIGN_FLAG_WORD) ? TRUE : FALSE;
+ Value--;
+ }
+
+ if (ModRegRm.Register <= 1)
+ {
+ /* Update flags */
+ State->Flags.Sf = (Value & SIGN_FLAG_WORD) ? TRUE : FALSE;
+ State->Flags.Zf = (Value == 0) ? TRUE : FALSE;
+ State->Flags.Af = ((Value & 0x0F) == 0) ? TRUE : FALSE;
+ State->Flags.Pf = Soft386CalculateParity(Value);
+
+ /* Write back the result */
+ return Soft386WriteModrmWordOperands(State,
+ &ModRegRm,
+ FALSE,
+ Value);
+ }
+ }
+
+ if (ModRegRm.Register > 1)
+ {
+ UNIMPLEMENTED;
+ return FALSE; // NOT IMPLEMENTED
+ }
+
+ return TRUE;
}
/* EOF */