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[SOFT386]

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Implement the following opcodes:
INC reg16/reg32
DEC reg16/reg32


svn path=/branches/ntvdm/; revision=59814
This commit is contained in:
Aleksandar Andrejevic 2013-08-24 21:32:45 +00:00
parent 610999cb63
commit fffdba9eb5
4 changed files with 142 additions and 16 deletions
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10
lib/soft386/common.c
View file

@ -754,4 +754,14 @@ Soft386Exception(PSOFT386_STATE State, INT ExceptionCode)
}
}
inline
BOOLEAN
Soft386CalculateParity(UCHAR Number)
{
Number ^= Number >> 1;
Number ^= Number >> 2;
Number ^= Number >> 4;
return !(Number & 1);
}
/* EOF */

10
lib/soft386/common.h
View file

@ -15,6 +15,9 @@
#define FASTCALL __fastcall
#endif
#define SIGN_FLAG_BYTE 0x80
#define SIGN_FLAG_WORD 0x8000
#define SIGN_FLAG_LONG 0x80000000
#define GET_SEGMENT_RPL(s) ((s) & 3)
#define GET_SEGMENT_INDEX(s) ((s) & 0xFFF8)
@ -119,6 +122,13 @@ Soft386Exception
INT ExceptionCode
);
inline
BOOLEAN
Soft386CalculateParity
(
UCHAR Number
);
#endif // _COMMON_H_
/* EOF */

122
lib/soft386/opcodes.c
View file

@ -88,22 +88,22 @@ Soft386OpcodeHandlers[SOFT386_NUM_OPCODE_HANDLERS] =
NULL, // TODO: OPCODE 0x3D NOT SUPPORTED
Soft386OpcodePrefix,
NULL, // TODO: OPCODE 0x3F NOT SUPPORTED
NULL, // TODO: OPCODE 0x40 NOT SUPPORTED
NULL, // TODO: OPCODE 0x41 NOT SUPPORTED
NULL, // TODO: OPCODE 0x42 NOT SUPPORTED
NULL, // TODO: OPCODE 0x43 NOT SUPPORTED
NULL, // TODO: OPCODE 0x44 NOT SUPPORTED
NULL, // TODO: OPCODE 0x45 NOT SUPPORTED
NULL, // TODO: OPCODE 0x46 NOT SUPPORTED
NULL, // TODO: OPCODE 0x47 NOT SUPPORTED
NULL, // TODO: OPCODE 0x48 NOT SUPPORTED
NULL, // TODO: OPCODE 0x49 NOT SUPPORTED
NULL, // TODO: OPCODE 0x4A NOT SUPPORTED
NULL, // TODO: OPCODE 0x4B NOT SUPPORTED
NULL, // TODO: OPCODE 0x4C NOT SUPPORTED
NULL, // TODO: OPCODE 0x4D NOT SUPPORTED
NULL, // TODO: OPCODE 0x4E NOT SUPPORTED
NULL, // TODO: OPCODE 0x4F NOT SUPPORTED
Soft386OpcodeIncrement,
Soft386OpcodeIncrement,
Soft386OpcodeIncrement,
Soft386OpcodeIncrement,
Soft386OpcodeIncrement,
Soft386OpcodeIncrement,
Soft386OpcodeIncrement,
Soft386OpcodeIncrement,
Soft386OpcodeDecrement,
Soft386OpcodeDecrement,
Soft386OpcodeDecrement,
Soft386OpcodeDecrement,
Soft386OpcodeDecrement,
Soft386OpcodeDecrement,
Soft386OpcodeDecrement,
Soft386OpcodeDecrement,
NULL, // TODO: OPCODE 0x50 NOT SUPPORTED
NULL, // TODO: OPCODE 0x51 NOT SUPPORTED
NULL, // TODO: OPCODE 0x52 NOT SUPPORTED
@ -444,3 +444,93 @@ Soft386OpcodePrefix(PSOFT386_STATE State, UCHAR Opcode)
return TRUE;
}
BOOLEAN
FASTCALL
Soft386OpcodeIncrement(PSOFT386_STATE State, UCHAR Opcode)
{
ULONG Value;
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) == 0x40);
if (Size)
{
Value = ++State->GeneralRegs[Opcode & 0x07].Long;
State->Flags.Of = (Value == SIGN_FLAG_LONG) ? TRUE : FALSE;
State->Flags.Sf = (Value & SIGN_FLAG_LONG) ? TRUE : FALSE;
}
else
{
Value = ++State->GeneralRegs[Opcode & 0x07].LowWord;
State->Flags.Of = (Value == SIGN_FLAG_WORD) ? TRUE : FALSE;
State->Flags.Sf = (Value & SIGN_FLAG_WORD) ? TRUE : FALSE;
}
State->Flags.Zf = (Value == 0) ? TRUE : FALSE;
State->Flags.Af = ((Value & 0x0F) == 0) ? TRUE : FALSE;
State->Flags.Pf = Soft386CalculateParity(LOBYTE(Value));
/* Return success */
return TRUE;
}
BOOLEAN
FASTCALL
Soft386OpcodeDecrement(PSOFT386_STATE State, UCHAR Opcode)
{
ULONG Value;
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) == 0x48);
if (Size)
{
Value = --State->GeneralRegs[Opcode & 0x07].Long;
State->Flags.Of = (Value == (SIGN_FLAG_LONG - 1)) ? TRUE : FALSE;
State->Flags.Sf = (Value & SIGN_FLAG_LONG) ? TRUE : FALSE;
}
else
{
Value = --State->GeneralRegs[Opcode & 0x07].LowWord;
State->Flags.Of = (Value == (SIGN_FLAG_WORD - 1)) ? TRUE : FALSE;
State->Flags.Sf = (Value & SIGN_FLAG_WORD) ? TRUE : FALSE;
}
State->Flags.Zf = (Value == 0) ? TRUE : FALSE;
State->Flags.Af = ((Value & 0x0F) == 0x0F) ? TRUE : FALSE;
State->Flags.Pf = Soft386CalculateParity(LOBYTE(Value));
/* Return success */
return TRUE;
}

16
lib/soft386/opcodes.h
View file

@ -31,4 +31,20 @@ Soft386OpcodePrefix
UCHAR Opcode
);
BOOLEAN
FASTCALL
Soft386OpcodeIncrement
(
PSOFT386_STATE State,
UCHAR Opcode
);
BOOLEAN
FASTCALL
Soft386OpcodeDecrement
(
PSOFT386_STATE State,
UCHAR Opcode
);
#endif // _OPCODES_H_