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[SOFT386]

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Implement the following opcodes:
NOP
XCHG (E)AX, reg16/reg32


svn path=/branches/ntvdm/; revision=59819
This commit is contained in:
Aleksandar Andrejevic 2013-08-25 14:53:58 +00:00
parent 5a86737e91
commit 3ad78aac17
2 changed files with 86 additions and 8 deletions
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78
lib/soft386/opcodes.c
View file

@ -168,14 +168,14 @@ Soft386OpcodeHandlers[SOFT386_NUM_OPCODE_HANDLERS] =
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 @@ Soft386OpcodePopReg(PSOFT386_STATE State, UCHAR Opcode)
/* 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;
}

16
lib/soft386/opcodes.h
View file

@ -63,4 +63,20 @@ Soft386OpcodePopReg
UCHAR Opcode
);
BOOLEAN
FASTCALL
Soft386OpcodeNop
(
PSOFT386_STATE State,
UCHAR Opcode
);
BOOLEAN
FASTCALL
Soft386OpcodeExchangeEax
(
PSOFT386_STATE State,
UCHAR Opcode
);
#endif // _OPCODES_H_