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[FAST486]

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Implement FLDENV and FRSTOR.


svn path=/trunk/; revision=66134
This commit is contained in:
Aleksandar Andrejevic 2015-01-31 22:47:05 +00:00
parent 4c848e9a69
commit 6af9d3e24c
1 changed files with 89 additions and 10 deletions
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99
reactos/lib/fast486/fpu.c
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@ -919,6 +919,49 @@ Fast486FpuArithmeticOperation(PFAST486_STATE State,
}
}
static inline BOOLEAN FASTCALL
Fast486FpuLoadEnvironment(PFAST486_STATE State,
INT Segment,
ULONG Address,
BOOLEAN Size)
{
UCHAR Buffer[28];
if (!Fast486ReadMemory(State, Segment, Address, FALSE, Buffer, (Size + 1) * 14))
{
/* Exception occurred */
return FALSE;
}
/* Check if this is a 32-bit save or a 16-bit save */
if (Size)
{
PULONG Data = (PULONG)Buffer;
State->FpuControl.Value = (USHORT)Data[0];
State->FpuStatus.Value = (USHORT)Data[1];
State->FpuTag = (USHORT)Data[2];
State->FpuLastInstPtr.Long = Data[3];
State->FpuLastCodeSel = (USHORT)Data[4];
State->FpuLastOpPtr.Long = Data[5];
State->FpuLastDataSel = (USHORT)Data[6];
}
else
{
PUSHORT Data = (PUSHORT)Buffer;
State->FpuControl.Value = Data[0];
State->FpuStatus.Value = Data[1];
State->FpuTag = Data[2];
State->FpuLastInstPtr.LowWord = Data[3];
State->FpuLastCodeSel = Data[4];
State->FpuLastOpPtr.LowWord = Data[5];
State->FpuLastDataSel = Data[6];
}
return TRUE;
}
static inline BOOLEAN FASTCALL
Fast486FpuSaveEnvironment(PFAST486_STATE State,
INT Segment,
@ -1136,9 +1179,11 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9)
/* FLDENV */
case 4:
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
Fast486FpuLoadEnvironment(State,
(State->PrefixFlags & FAST486_PREFIX_SEG)
? FAST486_REG_DS : State->SegmentOverride,
ModRegRm.MemoryAddress,
OperandSize);
break;
}
@ -1698,8 +1743,47 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDD)
/* FRSTOR */
case 4:
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
INT i;
UCHAR AllRegs[80];
/* Save the environment */
if (!Fast486FpuLoadEnvironment(State,
(State->PrefixFlags & FAST486_PREFIX_SEG)
? FAST486_REG_DS : State->SegmentOverride,
ModRegRm.MemoryAddress,
OperandSize))
{
/* Exception occurred */
return;
}
/* Load the registers */
if (!Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG)
? FAST486_REG_DS : State->SegmentOverride,
ModRegRm.MemoryAddress + (OperandSize + 1) * 14,
FALSE,
AllRegs,
sizeof(AllRegs)))
{
/* Exception occurred */
return;
}
for (i = 0; i < FAST486_NUM_FPU_REGS; i++)
{
State->FpuRegisters[i].Mantissa = *((PULONGLONG)&AllRegs[i * 10]);
State->FpuRegisters[i].Exponent = *((PUSHORT)&AllRegs[(i * 10) + sizeof(ULONGLONG)]) & 0x7FFF;
if (*((PUSHORT)&AllRegs[(i * 10) + sizeof(ULONGLONG)]) & 0x8000)
{
State->FpuRegisters[i].Sign = TRUE;
}
else
{
State->FpuRegisters[i].Sign = FALSE;
}
}
break;
}
@ -1710,8 +1794,6 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDD)
INT i;
UCHAR AllRegs[80];
FPU_SAVE_LAST_INST();
/* Save the environment */
if (!Fast486FpuSaveEnvironment(State,
(State->PrefixFlags & FAST486_PREFIX_SEG)
@ -1748,9 +1830,6 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDD)
/* FSTSW */
case 7:
{
FPU_SAVE_LAST_INST();
FPU_SAVE_LAST_OPERAND();
Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, State->FpuStatus.Value);
break;
}