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[SOFT386]

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Implement the MOV AL/AX/EAX, off16/32 and MOV off16/32, AL/AX/EAX instructions.


svn path=/branches/ntvdm/; revision=60289
This commit is contained in:
Aleksandar Andrejevic 2013-09-21 18:44:59 +00:00
parent 60a7ff2e92
commit 432372c3b6
2 changed files with 201 additions and 4 deletions
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201
lib/soft386/opcodes.c
View file

@ -184,10 +184,10 @@ Soft386OpcodeHandlers[SOFT386_NUM_OPCODE_HANDLERS] =
Soft386OpcodePopFlags,
Soft386OpcodeSahf,
Soft386OpcodeLahf,
NULL, // TODO: OPCODE 0xA0 NOT SUPPORTED
NULL, // TODO: OPCODE 0xA1 NOT SUPPORTED
NULL, // TODO: OPCODE 0xA2 NOT SUPPORTED
NULL, // TODO: OPCODE 0xA3 NOT SUPPORTED
Soft386OpcodeMovAlOffset,
Soft386OpcodeMovEaxOffset,
Soft386OpcodeMovOffsetAl,
Soft386OpcodeMovOffsetEax,
NULL, // TODO: OPCODE 0xA4 NOT SUPPORTED
NULL, // TODO: OPCODE 0xA5 NOT SUPPORTED
NULL, // TODO: OPCODE 0xA6 NOT SUPPORTED
@ -4639,3 +4639,196 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeJmpAbs)
return FALSE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovAlOffset)
{
BOOLEAN Size = State->SegmentRegs[SOFT386_REG_CS].Size;
ULONG Offset;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xA0);
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the size */
Size = !Size;
}
if (Size)
{
if (!Soft386FetchDword(State, &Offset))
{
/* Exception occurred */
return FALSE;
}
}
else
{
USHORT WordOffset;
if (!Soft386FetchWord(State, &WordOffset))
{
/* Exception occurred */
return FALSE;
}
Offset = (ULONG)WordOffset;
}
/* Read from memory */
return Soft386ReadMemory(State,
(State->PrefixFlags & SOFT386_PREFIX_SEG) ?
State->SegmentOverride : SOFT386_REG_DS,
Offset,
FALSE,
&State->GeneralRegs[SOFT386_REG_EAX].LowByte,
sizeof(UCHAR));
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovEaxOffset)
{
BOOLEAN Size = State->SegmentRegs[SOFT386_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xA1);
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the size */
Size = !Size;
}
if (Size)
{
ULONG Offset;
if (!Soft386FetchDword(State, &Offset))
{
/* Exception occurred */
return FALSE;
}
/* Read from memory */
return Soft386ReadMemory(State,
(State->PrefixFlags & SOFT386_PREFIX_SEG) ?
State->SegmentOverride : SOFT386_REG_DS,
Offset,
FALSE,
&State->GeneralRegs[SOFT386_REG_EAX].Long,
sizeof(ULONG));
}
else
{
USHORT Offset;
if (!Soft386FetchWord(State, &Offset))
{
/* Exception occurred */
return FALSE;
}
/* Read from memory */
return Soft386ReadMemory(State,
(State->PrefixFlags & SOFT386_PREFIX_SEG) ?
State->SegmentOverride : SOFT386_REG_DS,
Offset,
FALSE,
&State->GeneralRegs[SOFT386_REG_EAX].LowWord,
sizeof(USHORT));
}
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovOffsetAl)
{
BOOLEAN Size = State->SegmentRegs[SOFT386_REG_CS].Size;
ULONG Offset;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xA2);
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the size */
Size = !Size;
}
if (Size)
{
if (!Soft386FetchDword(State, &Offset))
{
/* Exception occurred */
return FALSE;
}
}
else
{
USHORT WordOffset;
if (!Soft386FetchWord(State, &WordOffset))
{
/* Exception occurred */
return FALSE;
}
Offset = (ULONG)WordOffset;
}
/* Write to memory */
return Soft386WriteMemory(State,
(State->PrefixFlags & SOFT386_PREFIX_SEG) ?
State->SegmentOverride : SOFT386_REG_DS,
Offset,
&State->GeneralRegs[SOFT386_REG_EAX].LowByte,
sizeof(UCHAR));
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovOffsetEax)
{
BOOLEAN Size = State->SegmentRegs[SOFT386_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xA3);
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the size */
Size = !Size;
}
if (Size)
{
ULONG Offset;
if (!Soft386FetchDword(State, &Offset))
{
/* Exception occurred */
return FALSE;
}
/* Write to memory */
return Soft386WriteMemory(State,
(State->PrefixFlags & SOFT386_PREFIX_SEG) ?
State->SegmentOverride : SOFT386_REG_DS,
Offset,
&State->GeneralRegs[SOFT386_REG_EAX].Long,
sizeof(ULONG));
}
else
{
USHORT Offset;
if (!Soft386FetchWord(State, &Offset))
{
/* Exception occurred */
return FALSE;
}
/* Write to memory */
return Soft386WriteMemory(State,
(State->PrefixFlags & SOFT386_PREFIX_SEG) ?
State->SegmentOverride : SOFT386_REG_DS,
Offset,
&State->GeneralRegs[SOFT386_REG_EAX].LowWord,
sizeof(USHORT));
}
}

4
lib/soft386/opcodes.h
View file

@ -132,5 +132,9 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeJecxz);
SOFT386_OPCODE_HANDLER(Soft386OpcodeCall);
SOFT386_OPCODE_HANDLER(Soft386OpcodeJmp);
SOFT386_OPCODE_HANDLER(Soft386OpcodeJmpAbs);
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovAlOffset);
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovEaxOffset);
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovOffsetAl);
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovOffsetEax);
#endif // _OPCODES_H_