[aandrejevic] 60458: [SOFT386] Move the ROL/ROR/RCL/RCR/SHL/SHR/SAL/SAR handling code to Soft386RotateOperation, then use that to implement opcode groups 0xD0, 0xD1, 0xD2 and 0xD3.
29 Sep
2013
29 Sep
'13
10:15 p.m.
Author: aandrejevic
Date: Sun Sep 29 22:15:32 2013
New Revision: 60458
URL: http://svn.reactos.org/svn/reactos?rev=60458&view=rev
Log:
[SOFT386]
Move the ROL/ROR/RCL/RCR/SHL/SHR/SAL/SAR handling code to Soft386RotateOperation,
then use that to implement opcode groups 0xD0, 0xD1, 0xD2 and 0xD3.
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] Sun Sep 29 22:15:32 2013
@@ -19,6 +19,143 @@
#include "opcodes.h"
#include "common.h"
+/* PRIVATE FUNCTIONS **********************************************************/
+
+static
+inline
+ULONG
+Soft386RotateOperation(PSOFT386_STATE State,
+ INT Operation,
+ ULONG Value,
+ UCHAR Bits,
+ UCHAR Count)
+{
+ ULONG HighestBit = 1 << (Bits - 1);
+ ULONG Result;
+
+ if ((Operation != 2) && (Operation != 3))
+ {
+ /* Mask the count */
+ Count &= Bits - 1;
+ }
+ else
+ {
+ /* For RCL and RCR, the CF is included in the value */
+ Count %= Bits + 1;
+ }
+
+ /* Check which operation is this */
+ switch (Operation)
+ {
+ /* ROL */
+ case 0:
+ {
+ Result = (Value << Count) | (Value >> (Bits - Count));
+
+ /* Update CF and OF */
+ State->Flags.Cf = Result & 1;
+ if (Count == 1) State->Flags.Of = ((Result & HighestBit) ? TRUE :
FALSE)
+ ^ State->Flags.Cf;
+
+ break;
+ }
+
+ /* ROR */
+ case 1:
+ {
+ Result = (Value >> Count) | (Value << (Bits - Count));
+
+ /* Update CF and OF */
+ State->Flags.Cf = (Result & HighestBit) ? TRUE : FALSE;
+ if (Count == 1) State->Flags.Of = State->Flags.Cf
+ ^ ((Result & (HighestBit >> 1))
+ ? TRUE : FALSE);
+
+ break;
+ }
+
+ /* RCL */
+ case 2:
+ {
+ Result = (Value << Count)
+ | (State->Flags.Cf << (Count - 1))
+ | (Value >> (Bits - Count + 1));
+
+ /* Update CF and OF */
+ State->Flags.Cf = (Value & (1 << (Bits - Count))) ? TRUE :
FALSE;
+ if (Count == 1) State->Flags.Of = ((Result & HighestBit) ? TRUE :
FALSE)
+ ^ State->Flags.Cf;
+
+ break;
+ }
+
+ /* RCR */
+ case 3:
+ {
+ Result = (Value >> Count)
+ | (State->Flags.Cf << (Bits - Count))
+ | (Value << (Bits - Count + 1));
+
+ /* Update CF and OF */
+ State->Flags.Cf = (Value & (1 << (Bits - Count))) ? TRUE :
FALSE;
+ if (Count == 1) State->Flags.Of = State->Flags.Cf
+ ^ ((Result & (HighestBit >> 1))
+ ? TRUE : FALSE);
+
+ break;
+ }
+
+ /* SHL/SAL */
+ case 4:
+ case 6:
+ {
+ Result = Value << Count;
+
+ /* Update CF and OF */
+ State->Flags.Cf = (Value & (1 << (Bits - Count))) ? TRUE :
FALSE;
+ if (Count == 1) State->Flags.Of = ((Result & HighestBit) ? TRUE :
FALSE)
+ ^ (State->Flags.Cf ? TRUE : FALSE);
+
+ break;
+ }
+
+ /* SHR */
+ case 5:
+ {
+ Result = Value >> Count;
+
+ /* Update CF and OF */
+ State->Flags.Cf = (Value & (1 << (Count - 1))) ? TRUE : FALSE;
+ if (Count == 1) State->Flags.Of = (Value & HighestBit) ? TRUE :
FALSE;
+
+ break;
+ }
+
+ /* SAR */
+ case 7:
+ {
+ Result = Value >> Count;
+
+ /* Fill the top Count bits with the sign bit */
+ if (Value & HighestBit) Result |= ((1 << Count) - 1) << (Bits
- Count);
+
+ /* Update CF and OF */
+ State->Flags.Cf = Value & 1;
+ if (Count == 1) State->Flags.Of = FALSE;
+
+ break;
+ }
+ }
+
+ /* Update ZF, SF and PF */
+ State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
+ State->Flags.Sf = (Result & HighestBit) ? TRUE : FALSE;
+ State->Flags.Pf = Soft386CalculateParity(Result);
+
+ /* Return the result */
+ return Result;
+}
+
/* PUBLIC FUNCTIONS ***********************************************************/
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup8082)
@@ -347,7 +484,7 @@
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupD0)
{
- UCHAR Result, Dummy, Value;
+ UCHAR Dummy, Value;
SOFT386_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
@@ -370,104 +507,8 @@
return FALSE;
}
- /* Check which operation is this */
- switch (ModRegRm.Register)
- {
- /* ROL */
- case 0:
- {
- Result = (Value << 1) | (Value >> 7);
-
- /* Update CF and OF */
- State->Flags.Cf = Value >> 7;
- State->Flags.Of = ((Result & SIGN_FLAG_BYTE) ? TRUE : FALSE)
- ^ (State->Flags.Cf ? TRUE : FALSE);
-
- break;
- }
-
- /* ROR */
- case 1:
- {
- Result = (Value >> 1) | (Value << 7);
-
- /* Update CF and OF */
- State->Flags.Cf = Value & 1;
- State->Flags.Of = ((Result & SIGN_FLAG_BYTE) ? TRUE : FALSE)
- ^ ((Result & (SIGN_FLAG_BYTE >> 1)) ? TRUE :
FALSE);
-
- break;
- }
-
- /* RCL */
- case 2:
- {
- Result = (Value << 1) | (State->Flags.Cf ? 1 : 0);
-
- /* Update CF and OF */
- State->Flags.Cf = (Value & SIGN_FLAG_BYTE) ? TRUE : FALSE;
- State->Flags.Of = ((Result & SIGN_FLAG_BYTE) ? TRUE : FALSE)
- ^ (State->Flags.Cf ? TRUE : FALSE);
-
- break;
- }
-
- /* RCR */
- case 3:
- {
- Result = (Value >> 1) | (State->Flags.Cf ? SIGN_FLAG_BYTE : 0);
-
- /* Update CF and OF */
- State->Flags.Cf = Value & 1;
- State->Flags.Of = ((Result & SIGN_FLAG_BYTE) ? TRUE : FALSE)
- ^ ((Result & (SIGN_FLAG_BYTE >> 1)) ? TRUE :
FALSE);
-
- break;
- }
-
- /* SHL/SAL */
- case 4:
- case 6:
- {
- Result = Value << 1;
-
- /* Update CF and OF */
- State->Flags.Cf = (Value & SIGN_FLAG_BYTE) ? TRUE : FALSE;
- State->Flags.Of = ((Result & SIGN_FLAG_BYTE) ? TRUE : FALSE)
- ^ (State->Flags.Cf ? TRUE : FALSE);
-
- break;
- }
-
- /* SHR */
- case 5:
- {
- Result = Value >> 1;
-
- /* Update CF and OF */
- State->Flags.Cf = Value & 1;
- State->Flags.Of = (Value & SIGN_FLAG_BYTE) ? TRUE : FALSE;
-
- break;
- }
-
- /* SAR */
- case 7:
- {
- Result = (Value >> 1) | (Value & SIGN_FLAG_BYTE);
-
- /* Update CF and OF */
- State->Flags.Cf = Value & 1;
- State->Flags.Of = FALSE;
-
- break;
- }
- }
-
- /* Update ZF, SF and PF */
- State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
- State->Flags.Sf = (Result & SIGN_FLAG_BYTE) ? TRUE : FALSE;
- State->Flags.Pf = Soft386CalculateParity(Result);
+ /* Calculate the result */
+ Value = LOBYTE(Soft386RotateOperation(State, ModRegRm.Register, Value, 8, 1));
/* Write back the result */
return Soft386WriteModrmByteOperands(State,
@@ -479,20 +520,174 @@
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupD1)
{
- 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 (OperandSize)
+ {
+ ULONG Dummy, Value;
+
+ /* Read the operands */
+ if (!Soft386ReadModrmDwordOperands(State, &ModRegRm, &Dummy,
&Value))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Calculate the result */
+ Value = Soft386RotateOperation(State, ModRegRm.Register, Value, 32, 1);
+
+ /* Write back the result */
+ return Soft386WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
+ }
+ else
+ {
+ USHORT Dummy, Value;
+
+ /* Read the operands */
+ if (!Soft386ReadModrmWordOperands(State, &ModRegRm, &Dummy, &Value))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Calculate the result */
+ Value = LOWORD(Soft386RotateOperation(State, ModRegRm.Register, Value, 16, 1));
+
+ /* Write back the result */
+ return Soft386WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
+ }
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupD2)
{
- UNIMPLEMENTED;
- return FALSE; // TODO: NOT IMPLEMENTED
+ UCHAR Dummy, Value;
+ SOFT386_MOD_REG_RM ModRegRm;
+ BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
+
+ if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
+ {
+ /* The ADSIZE prefix toggles the size */
+ AddressSize = !AddressSize;
+ }
+
+ if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Read the operands */
+ if (!Soft386ReadModrmByteOperands(State, &ModRegRm, &Dummy, &Value))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Calculate the result */
+ Value = LOBYTE(Soft386RotateOperation(State,
+ ModRegRm.Register,
+ Value,
+ 8,
+
State->GeneralRegs[SOFT386_REG_ECX].LowByte));
+
+ /* Write back the result */
+ return Soft386WriteModrmByteOperands(State,
+ &ModRegRm,
+ FALSE,
+ Value);
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupD3)
{
- 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 (OperandSize)
+ {
+ ULONG Dummy, Value;
+
+ /* Read the operands */
+ if (!Soft386ReadModrmDwordOperands(State, &ModRegRm, &Dummy,
&Value))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Calculate the result */
+ Value = Soft386RotateOperation(State,
+ ModRegRm.Register,
+ Value,
+ 32,
+ State->GeneralRegs[SOFT386_REG_ECX].LowByte);
+
+ /* Write back the result */
+ return Soft386WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
+ }
+ else
+ {
+ USHORT Dummy, Value;
+
+ /* Read the operands */
+ if (!Soft386ReadModrmWordOperands(State, &ModRegRm, &Dummy, &Value))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Calculate the result */
+ Value = LOWORD(Soft386RotateOperation(State,
+ ModRegRm.Register,
+ Value,
+ 16,
+
State->GeneralRegs[SOFT386_REG_ECX].LowByte));
+
+ /* Write back the result */
+ return Soft386WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
+ }
+
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupF6)
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