[FAST486]

Implement the two operand version of IMUL.

svn path=/branches/ntvdm/; revision=60929

diff --git a/lib/fast486/extraops.c b/lib/fast486/extraops.c
index c1a09c8..95bd42c 100644 (file)
--- a/lib/fast486/extraops.c
+++ b/lib/fast486/extraops.c
@@ -212,7 +212,7 @@ Fast486ExtendedHandlers[FAST486_NUM_OPCODE_HANDLERS] =
     NULL, // TODO: OPCODE 0xAC NOT IMPLEMENTED
     NULL, // TODO: OPCODE 0xAD NOT IMPLEMENTED
     NULL, // TODO: OPCODE 0xAE NOT IMPLEMENTED
-    NULL, // TODO: OPCODE 0xAF NOT IMPLEMENTED
+    Fast486ExtOpcodeImul,
     Fast486ExtOpcodeCmpXchgByte,
     Fast486ExtOpcodeCmpXchg,
     NULL, // TODO: OPCODE 0xB2 NOT IMPLEMENTED
@@ -712,6 +712,70 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBts)
     return TRUE;
 }
 
+FAST486_OPCODE_HANDLER(Fast486ExtOpcodeImul)
+{
+    BOOLEAN OperandSize, AddressSize;
+    FAST486_MOD_REG_RM ModRegRm;
+
+    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
+
+    /* Get the operands */
+    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
+    {
+        /* Exception occurred */
+        return FALSE;
+    }
+
+    if (OperandSize)
+    {
+        LONG Source, Destination;
+        LONGLONG Result;
+
+        /* Read the operands */
+        if (!Fast486ReadModrmDwordOperands(State,
+                                           &ModRegRm,
+                                           (PULONG)&Destination,
+                                           (PULONG)&Source))
+        {
+            /* Exception occurred */
+            return FALSE;
+        }
+
+        /* Calculate the result */
+        Result = (LONGLONG)Source * (LONGLONG)Destination;
+
+        /* Update the flags */
+        State->Flags.Cf = State->Flags.Of = ((Result < -2147483648LL) || (Result > 2147483647LL));
+
+        /* Write back the result */
+        return Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, (ULONG)((LONG)Result));
+    }
+    else
+    {
+        SHORT Source, Destination;
+        LONG Result;
+
+        /* Read the operands */
+        if (!Fast486ReadModrmWordOperands(State,
+                                          &ModRegRm,
+                                          (PUSHORT)&Destination,
+                                          (PUSHORT)&Source))
+        {
+            /* Exception occurred */
+            return FALSE;
+        }
+
+        /* Calculate the result */
+        Result = (LONG)Source * (LONG)Destination;
+
+        /* Update the flags */
+        State->Flags.Cf = State->Flags.Of = ((Result < -32768) || (Result > 32767));
+
+        /* Write back the result */
+        return Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, (USHORT)((SHORT)Result));
+    }
+}
+
 FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchgByte)
 {
     FAST486_MOD_REG_RM ModRegRm;

diff --git a/lib/fast486/extraops.h b/lib/fast486/extraops.h
index 9b5a3e4..5c363ed 100644 (file)
--- a/lib/fast486/extraops.h
+++ b/lib/fast486/extraops.h
@@ -37,6 +37,7 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBitTest);
 FAST486_OPCODE_HANDLER(Fast486ExtOpcodePushGs);
 FAST486_OPCODE_HANDLER(Fast486ExtOpcodePopGs);
 FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBts);
+FAST486_OPCODE_HANDLER(Fast486ExtOpcodeImul);
 FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchgByte);
 FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchg);
 FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtr);