[aandrejevic] 59819: [SOFT386] Implement the following opcodes: NOP XCHG (E)AX, reg16/reg32

Author: aandrejevic
Date: Sun Aug 25 14:53:58 2013
New Revision: 59819

URL: http://svn.reactos.org/svn/reactos?rev=59819&view=rev
Log:
[SOFT386]
Implement the following opcodes:
NOP
XCHG (E)AX, reg16/reg32


Modified:
    branches/ntvdm/lib/soft386/opcodes.c
    branches/ntvdm/lib/soft386/opcodes.h

Modified: branches/ntvdm/lib/soft386/opcodes.c
URL:
http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/soft386/opcodes.c?rev…
==============================================================================
--- branches/ntvdm/lib/soft386/opcodes.c	[iso-8859-1] (original)
+++ branches/ntvdm/lib/soft386/opcodes.c	[iso-8859-1] Sun Aug 25 14:53:58 2013
@@ -168,14 +168,14 @@
     NULL, // TODO: OPCODE 0x8D NOT SUPPORTED
     NULL, // TODO: OPCODE 0x8E NOT SUPPORTED
     NULL, // TODO: OPCODE 0x8F NOT SUPPORTED
-    NULL, // TODO: OPCODE 0x90 NOT SUPPORTED
-    NULL, // TODO: OPCODE 0x91 NOT SUPPORTED
-    NULL, // TODO: OPCODE 0x92 NOT SUPPORTED
-    NULL, // TODO: OPCODE 0x93 NOT SUPPORTED
-    NULL, // TODO: OPCODE 0x94 NOT SUPPORTED
-    NULL, // TODO: OPCODE 0x95 NOT SUPPORTED
-    NULL, // TODO: OPCODE 0x96 NOT SUPPORTED
-    NULL, // TODO: OPCODE 0x97 NOT SUPPORTED
+    Soft386OpcodeNop,
+    Soft386OpcodeExchangeEax,
+    Soft386OpcodeExchangeEax,
+    Soft386OpcodeExchangeEax,
+    Soft386OpcodeExchangeEax,
+    Soft386OpcodeExchangeEax,
+    Soft386OpcodeExchangeEax,
+    Soft386OpcodeExchangeEax,
     NULL, // TODO: OPCODE 0x98 NOT SUPPORTED
     NULL, // TODO: OPCODE 0x99 NOT SUPPORTED
     NULL, // TODO: OPCODE 0x9A NOT SUPPORTED
@@ -586,3 +586,65 @@
     /* Return success */
     return TRUE;
 }
+
+BOOLEAN
+FASTCALL
+Soft386OpcodeNop(PSOFT386_STATE State, UCHAR Opcode)
+{
+    if (State->PrefixFlags & ~(SOFT386_PREFIX_OPSIZE | SOFT386_PREFIX_REP))
+    {
+        /* Allowed prefixes are REP and OPSIZE */
+        Soft386Exception(State, SOFT386_EXCEPTION_UD);
+        return FALSE;
+    }
+
+    if (State->PrefixFlags & SOFT386_PREFIX_REP)
+    {
+        // TODO: Handle PAUSE instruction.
+    }
+
+    return TRUE;
+}
+
+BOOLEAN
+FASTCALL
+Soft386OpcodeExchangeEax(PSOFT386_STATE State, UCHAR Opcode)
+{
+    INT Reg = Opcode & 0x07;
+    BOOLEAN Size = State->SegmentRegs[SOFT386_REG_CS].Size;
+
+    if (State->PrefixFlags == SOFT386_PREFIX_OPSIZE)
+    {
+        /* The OPSIZE prefix toggles the size */
+        Size = !Size;
+    }
+    else if (State->PrefixFlags != 0)
+    {
+        /* Invalid prefix */
+        Soft386Exception(State, SOFT386_EXCEPTION_UD);
+        return FALSE;
+    }
+
+    /* Make sure this is the right instruction */
+    ASSERT((Opcode & 0xF8) == 0x90);
+
+    /* Exchange the values */
+    if (Size)
+    {
+        ULONG Value;
+
+        Value = State->GeneralRegs[Reg].Long;
+        State->GeneralRegs[Reg].Long = State->GeneralRegs[SOFT386_REG_EAX].Long;
+        State->GeneralRegs[SOFT386_REG_EAX].Long = Value;
+    }
+    else
+    {
+        USHORT Value;
+
+        Value = State->GeneralRegs[Reg].LowWord;
+        State->GeneralRegs[Reg].LowWord =
State->GeneralRegs[SOFT386_REG_EAX].LowWord;
+        State->GeneralRegs[SOFT386_REG_EAX].LowWord = Value;
+    }
+
+    return TRUE;
+}

Modified: branches/ntvdm/lib/soft386/opcodes.h
URL:
http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/soft386/opcodes.h?rev…
==============================================================================
--- branches/ntvdm/lib/soft386/opcodes.h	[iso-8859-1] (original)
+++ branches/ntvdm/lib/soft386/opcodes.h	[iso-8859-1] Sun Aug 25 14:53:58 2013
@@ -63,4 +63,20 @@
     UCHAR Opcode
 );
 
+BOOLEAN
+FASTCALL
+Soft386OpcodeNop
+(
+    PSOFT386_STATE State,
+    UCHAR Opcode
+);
+
+BOOLEAN
+FASTCALL
+Soft386OpcodeExchangeEax
+(
+    PSOFT386_STATE State,
+    UCHAR Opcode
+);
+
 #endif // _OPCODES_H_