[aandrejevic] 59994: [SOFT386] Implement the TEST instruction, and the XCHG instruction which uses MOD-REG-R/M for operands.
5 Sep
2013
5 Sep
'13
11:48 p.m.
Author: aandrejevic
Date: Thu Sep 5 23:48:07 2013
New Revision: 59994
URL: http://svn.reactos.org/svn/reactos?rev=59994&view=rev
Log:
[SOFT386]
Implement the TEST instruction, and the XCHG instruction which uses MOD-REG-R/M for
operands.
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] Thu Sep 5 23:48:07 2013
@@ -2290,3 +2290,323 @@
return TRUE;
}
+
+SOFT386_OPCODE_HANDLER(Soft386OpcodeTestByteModrm)
+{
+ UCHAR FirstValue, SecondValue, Result;
+ SOFT386_MOD_REG_RM ModRegRm;
+ BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
+
+ /* Make sure this is the right instruction */
+ ASSERT(Opcode == 0x84);
+
+ if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
+ {
+ /* The ADSIZE prefix toggles the size */
+ AddressSize = !AddressSize;
+ }
+ else if (State->PrefixFlags
+ & ~(SOFT386_PREFIX_ADSIZE
+ | SOFT386_PREFIX_SEG
+ | SOFT386_PREFIX_LOCK))
+ {
+ /* Invalid prefix */
+ Soft386Exception(State, SOFT386_EXCEPTION_UD);
+ return FALSE;
+ }
+
+ /* Get the operands */
+ if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ if (!Soft386ReadModrmByteOperands(State,
+ &ModRegRm,
+ &FirstValue,
+ &SecondValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+ /* Calculate the result */
+ Result = FirstValue & SecondValue;
+
+ /* Update the flags */
+ State->Flags.Cf = FALSE;
+ State->Flags.Of = FALSE;
+ State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
+ State->Flags.Sf = (Result & SIGN_FLAG_BYTE) ? TRUE : FALSE;
+ State->Flags.Pf = Soft386CalculateParity(Result);
+
+ /* The result is discarded */
+ return TRUE;
+}
+
+SOFT386_OPCODE_HANDLER(Soft386OpcodeTestModrm)
+{
+ SOFT386_MOD_REG_RM ModRegRm;
+ BOOLEAN OperandSize, AddressSize;
+
+ /* Make sure this is the right instruction */
+ ASSERT(Opcode == 0x85);
+
+ OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
+
+ if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
+ {
+ /* The ADSIZE prefix toggles the address size */
+ AddressSize = !AddressSize;
+ }
+
+ if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
+ {
+ /* The OPSIZE prefix toggles the operand size */
+ OperandSize = !OperandSize;
+ }
+
+ if (State->PrefixFlags
+ & ~(SOFT386_PREFIX_ADSIZE
+ | SOFT386_PREFIX_OPSIZE
+ | SOFT386_PREFIX_SEG
+ | SOFT386_PREFIX_LOCK))
+ {
+ /* Invalid prefix */
+ Soft386Exception(State, SOFT386_EXCEPTION_UD);
+ return FALSE;
+ }
+
+ /* Get the operands */
+ if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Check the operand size */
+ if (OperandSize)
+ {
+ ULONG FirstValue, SecondValue, Result;
+
+ if (!Soft386ReadModrmDwordOperands(State,
+ &ModRegRm,
+ &FirstValue,
+ &SecondValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Calculate the result */
+ Result = FirstValue & SecondValue;
+
+ /* Update the flags */
+ State->Flags.Cf = FALSE;
+ State->Flags.Of = FALSE;
+ State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
+ State->Flags.Sf = (Result & SIGN_FLAG_LONG) ? TRUE : FALSE;
+ State->Flags.Pf = Soft386CalculateParity(Result);
+ }
+ else
+ {
+ USHORT FirstValue, SecondValue, Result;
+
+ if (!Soft386ReadModrmWordOperands(State,
+ &ModRegRm,
+ &FirstValue,
+ &SecondValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Calculate the result */
+ Result = FirstValue & SecondValue;
+
+ /* Update the flags */
+ State->Flags.Cf = FALSE;
+ State->Flags.Of = FALSE;
+ State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
+ State->Flags.Sf = (Result & SIGN_FLAG_LONG) ? TRUE : FALSE;
+ State->Flags.Pf = Soft386CalculateParity(Result);
+ }
+
+ /* The result is discarded */
+ return TRUE;
+}
+
+SOFT386_OPCODE_HANDLER(Soft386OpcodeXchgByteModrm)
+{
+ UCHAR FirstValue, SecondValue;
+ SOFT386_MOD_REG_RM ModRegRm;
+ BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
+
+ /* Make sure this is the right instruction */
+ ASSERT(Opcode == 0x86);
+
+ if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
+ {
+ /* The ADSIZE prefix toggles the size */
+ AddressSize = !AddressSize;
+ }
+ else if (State->PrefixFlags
+ & ~(SOFT386_PREFIX_ADSIZE
+ | SOFT386_PREFIX_SEG
+ | SOFT386_PREFIX_LOCK))
+ {
+ /* Invalid prefix */
+ Soft386Exception(State, SOFT386_EXCEPTION_UD);
+ return FALSE;
+ }
+
+ /* Get the operands */
+ if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ if (!Soft386ReadModrmByteOperands(State,
+ &ModRegRm,
+ &FirstValue,
+ &SecondValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Write the value from the register to the R/M */
+ if (!Soft386WriteModrmByteOperands(State,
+ &ModRegRm,
+ FALSE,
+ FirstValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Write the value from the R/M to the register */
+ if (!Soft386WriteModrmByteOperands(State,
+ &ModRegRm,
+ TRUE,
+ SecondValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+SOFT386_OPCODE_HANDLER(Soft386OpcodeXchgModrm)
+{
+ SOFT386_MOD_REG_RM ModRegRm;
+ BOOLEAN OperandSize, AddressSize;
+
+ /* Make sure this is the right instruction */
+ ASSERT(Opcode == 0x87);
+
+ OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
+
+ if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
+ {
+ /* The ADSIZE prefix toggles the address size */
+ AddressSize = !AddressSize;
+ }
+
+ if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
+ {
+ /* The OPSIZE prefix toggles the operand size */
+ OperandSize = !OperandSize;
+ }
+
+ if (State->PrefixFlags
+ & ~(SOFT386_PREFIX_ADSIZE
+ | SOFT386_PREFIX_OPSIZE
+ | SOFT386_PREFIX_SEG
+ | SOFT386_PREFIX_LOCK))
+ {
+ /* Invalid prefix */
+ Soft386Exception(State, SOFT386_EXCEPTION_UD);
+ return FALSE;
+ }
+
+ /* Get the operands */
+ if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Check the operand size */
+ if (OperandSize)
+ {
+ ULONG FirstValue, SecondValue;
+
+ if (!Soft386ReadModrmDwordOperands(State,
+ &ModRegRm,
+ &FirstValue,
+ &SecondValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Write the value from the register to the R/M */
+ if (!Soft386WriteModrmDwordOperands(State,
+ &ModRegRm,
+ FALSE,
+ FirstValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Write the value from the R/M to the register */
+ if (!Soft386WriteModrmDwordOperands(State,
+ &ModRegRm,
+ TRUE,
+ SecondValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+ }
+ else
+ {
+ USHORT FirstValue, SecondValue;
+
+ if (!Soft386ReadModrmWordOperands(State,
+ &ModRegRm,
+ &FirstValue,
+ &SecondValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Write the value from the register to the R/M */
+ if (!Soft386WriteModrmWordOperands(State,
+ &ModRegRm,
+ FALSE,
+ FirstValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+
+ /* Write the value from the R/M to the register */
+ if (!Soft386WriteModrmWordOperands(State,
+ &ModRegRm,
+ TRUE,
+ SecondValue))
+ {
+ /* Exception occurred */
+ return FALSE;
+ }
+ }
+
+ /* The result is discarded */
+ 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] Thu Sep 5 23:48:07 2013
@@ -66,5 +66,9 @@
SOFT386_OPCODE_HANDLER(Soft386OpcodeXorModrm);
SOFT386_OPCODE_HANDLER(Soft386OpcodeXorAl);
SOFT386_OPCODE_HANDLER(Soft386OpcodeXorEax);
+SOFT386_OPCODE_HANDLER(Soft386OpcodeTestByteModrm);
+SOFT386_OPCODE_HANDLER(Soft386OpcodeTestModrm);
+SOFT386_OPCODE_HANDLER(Soft386OpcodeXchgByteModrm);
+SOFT386_OPCODE_HANDLER(Soft386OpcodeXchgModrm);
#endif // _OPCODES_H_
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aandrejevic＠svn.reactos.org