{
Fast486OpcodeGroup0F00,
Fast486OpcodeGroup0F01,
- NULL, // TODO: OPCODE 0x02 NOT IMPLEMENTED
+ Fast486ExtOpcodeLar,
Fast486ExtOpcodeLsl,
NULL, // Invalid
NULL, // Invalid
/* PUBLIC FUNCTIONS ***********************************************************/
+FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLar)
+{
+ BOOLEAN OperandSize, AddressSize;
+ FAST486_MOD_REG_RM ModRegRm;
+ USHORT Selector;
+ FAST486_GDT_ENTRY GdtEntry;
+ DWORD AccessRights;
+
+ OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
+
+ if (!(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
+ || State->Flags.Vm)
+ {
+ /* Not recognized */
+ Fast486Exception(State, FAST486_EXCEPTION_UD);
+ return FALSE;
+ }
+
+ NO_LOCK_PREFIX();
+ TOGGLE_OPSIZE(OperandSize);
+ TOGGLE_ADSIZE(AddressSize);
+
+ /* Get the operands */
+ if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ if (OperandSize)
+ {
+ ULONG Value;
+
+ /* Read the value */
+ if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ Selector = LOWORD(Value);
+ }
+ else
+ {
+ /* Read the value */
+ if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Selector))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+ }
+
+ if (!(Selector & SEGMENT_TABLE_INDICATOR))
+ {
+ /* Check if the GDT contains the entry */
+ if (GET_SEGMENT_INDEX(Selector) >= (State->Gdtr.Size + 1))
+ {
+ State->Flags.Zf = FALSE;
+ return TRUE;
+ }
+
+ /* Read the GDT */
+ if (!Fast486ReadLinearMemory(State,
+ State->Gdtr.Address
+ + GET_SEGMENT_INDEX(Selector),
+ &GdtEntry,
+ sizeof(GdtEntry)))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+ }
+ else
+ {
+ /* Check if the LDT contains the entry */
+ if (GET_SEGMENT_INDEX(Selector) >= (State->Ldtr.Limit + 1))
+ {
+ State->Flags.Zf = FALSE;
+ return TRUE;
+ }
+
+ /* Read the LDT */
+ if (!Fast486ReadLinearMemory(State,
+ State->Ldtr.Base
+ + GET_SEGMENT_INDEX(Selector),
+ &GdtEntry,
+ sizeof(GdtEntry)))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+ }
+
+ /* Privilege check */
+ if (((GET_SEGMENT_RPL(Selector) > GdtEntry.Dpl))
+ || (Fast486GetCurrentPrivLevel(State) > GdtEntry.Dpl))
+ {
+ State->Flags.Zf = FALSE;
+ return TRUE;
+ }
+
+ /* Set ZF */
+ State->Flags.Zf = TRUE;
+
+ /* Get the access rights */
+ AccessRights = ((PDWORD)&GdtEntry)[1] & 0x00F0FF00;
+
+ /* Return the access rights */
+ if (OperandSize)
+ {
+ if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, AccessRights))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+ }
+ else
+ {
+ if (!Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(AccessRights)))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLsl)
{
BOOLEAN OperandSize, AddressSize;