[aandrejevic] 61150: [FAST486] FPU instructions never generate #UD. If CR0.EM is set, they generate #NM. If there is no FPU and CR0.EM is cleared, they do nothing. Add a helper macro FPU_ST for acc...

Author: aandrejevic
Date: Sat Nov 30 02:03:51 2013
New Revision: 61150

URL: http://svn.reactos.org/svn/reactos?rev=61150&view=rev
Log:
[FAST486]
FPU instructions never generate #UD. If CR0.EM is set, they generate #NM.
If there is no FPU and CR0.EM is cleared, they do nothing.
Add a helper macro FPU_ST for accessing FPU registers.
Add a compile-time option to disable the FPU.

Modified:
    branches/ntvdm/lib/fast486/fast486.c
    branches/ntvdm/lib/fast486/fpu.c
    branches/ntvdm/lib/fast486/fpu.h

Modified: branches/ntvdm/lib/fast486/fast486.c
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/fast486/fast486.c?rev=...
==============================================================================
--- branches/ntvdm/lib/fast486/fast486.c	[iso-8859-1] (original)
+++ branches/ntvdm/lib/fast486/fast486.c	[iso-8859-1] Sat Nov 30 02:03:51 2013
@@ -266,8 +266,10 @@
     State->Idtr.Size = 0x3FF;
     State->Idtr.Address = 0;

+#ifndef FAST486_NO_FPU
     /* Initialize CR0 */
     State->ControlRegisters[FAST486_REG_CR0] |= FAST486_CR0_ET;
+#endif

/* Restore the callbacks and TLB */
     State->MemReadCallback  = MemReadCallback;

Modified: branches/ntvdm/lib/fast486/fpu.c
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/fast486/fpu.c?rev=6115...
==============================================================================
--- branches/ntvdm/lib/fast486/fpu.c	[iso-8859-1] (original)
+++ branches/ntvdm/lib/fast486/fpu.c	[iso-8859-1] Sat Nov 30 02:03:51 2013
@@ -35,66 +35,122 @@

FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD8)
 {
+    FPU_CHECK();
+
+#ifndef FAST486_NO_FPU
     // TODO: NOT IMPLEMENTED
     UNIMPLEMENTED;
-    Fast486Exception(State, FAST486_EXCEPTION_UD);
+
     return FALSE;
+#else
+    /* Do nothing */
+    return TRUE;
+#endif
 }

FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9)
 {
+    FPU_CHECK();
+
+#ifndef FAST486_NO_FPU
     // TODO: NOT IMPLEMENTED
     UNIMPLEMENTED;
-    Fast486Exception(State, FAST486_EXCEPTION_UD);
+
     return FALSE;
+#else
+    /* Do nothing */
+    return TRUE;
+#endif
 }

FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDA)
 {
+    FPU_CHECK();
+
+#ifndef FAST486_NO_FPU
     // TODO: NOT IMPLEMENTED
     UNIMPLEMENTED;
-    Fast486Exception(State, FAST486_EXCEPTION_UD);
+
     return FALSE;
+#else
+    /* Do nothing */
+    return TRUE;
+#endif
 }

FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDB)
 {
+    FPU_CHECK();
+
+#ifndef FAST486_NO_FPU
     // TODO: NOT IMPLEMENTED
     UNIMPLEMENTED;
-    Fast486Exception(State, FAST486_EXCEPTION_UD);
+
     return FALSE;
+#else
+    /* Do nothing */
+    return TRUE;
+#endif
 }

FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDC)
 {
+    FPU_CHECK();
+
+#ifndef FAST486_NO_FPU
     // TODO: NOT IMPLEMENTED
     UNIMPLEMENTED;
-    Fast486Exception(State, FAST486_EXCEPTION_UD);
+
     return FALSE;
+#else
+    /* Do nothing */
+    return TRUE;
+#endif
 }

FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDD)
 {
+    FPU_CHECK();
+
+#ifndef FAST486_NO_FPU
     // TODO: NOT IMPLEMENTED
     UNIMPLEMENTED;
-    Fast486Exception(State, FAST486_EXCEPTION_UD);
+
     return FALSE;
+#else
+    /* Do nothing */
+    return TRUE;
+#endif
 }

FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDE)
 {
+    FPU_CHECK();
+
+#ifndef FAST486_NO_FPU
     // TODO: NOT IMPLEMENTED
     UNIMPLEMENTED;
-    Fast486Exception(State, FAST486_EXCEPTION_UD);
+
     return FALSE;
+#else
+    /* Do nothing */
+    return TRUE;
+#endif
 }

FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDF)
 {
+    FPU_CHECK();
+
+#ifndef FAST486_NO_FPU
     // TODO: NOT IMPLEMENTED
     UNIMPLEMENTED;
-    Fast486Exception(State, FAST486_EXCEPTION_UD);
+
     return FALSE;
+#else
+    /* Do nothing */
+    return TRUE;
+#endif
 }

/* EOF */

Modified: branches/ntvdm/lib/fast486/fpu.h
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/fast486/fpu.h?rev=6115...
==============================================================================
--- branches/ntvdm/lib/fast486/fpu.h	[iso-8859-1] (original)
+++ branches/ntvdm/lib/fast486/fpu.h	[iso-8859-1] Sat Nov 30 02:03:51 2013
@@ -26,6 +26,13 @@

/* DEFINES ********************************************************************/

+#define FPU_CHECK() if (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_EM) \
+                    { \
+                        Fast486Exception(State, FAST486_EXCEPTION_NM); \
+                        return FALSE; \
+                    }
+#define FPU_ST(i) State->FpuRegisters[(State->FpuStatus.Top + (i)) % FAST486_NUM_FPU_REGS]
+
 enum
 {
     FPU_SINGLE_PRECISION = 0,