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[FAST486]

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Implement opcode 0xDE (New instructions: FADDP, FMULP, FCOMPP, FSUBRP, FSUBP, FDIVRP and FDIVP).
Fix a bug in the 0xD8/0xDC opcode handler.


svn path=/trunk/; revision=65934
This commit is contained in:
Aleksandar Andrejevic 2015-01-01 19:20:44 +00:00
parent 62af7c6673
commit cc0c2313c3
1 changed files with 138 additions and 15 deletions
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153
reactos/lib/fast486/fpu.c
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@ -423,6 +423,13 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD8DC)
#ifndef FAST486_NO_FPU
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{
/* Invalid operation */
State->FpuStatus.Ie = TRUE;
return;
}
if (ModRegRm.Memory)
{
/* Load the source operand from memory */
@ -459,28 +466,35 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD8DC)
}
SourceOperand = &MemoryData;
/* The destination operand is ST0 */
DestOperand = &FPU_ST(0);
}
else
{
/* Load the source operand from an FPU register */
SourceOperand = &FPU_ST(ModRegRm.SecondRegister);
if (FPU_GET_TAG(ModRegRm.SecondRegister) == FPU_TAG_EMPTY)
{
/* Invalid operation */
State->FpuStatus.Ie = TRUE;
return;
}
}
/* The destination operand is always ST0 */
DestOperand = &FPU_ST(0);
if (Opcode == 0xDC)
{
/* The source operand is ST0 */
SourceOperand = &FPU_ST(0);
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{
/* Invalid operation */
State->FpuStatus.Ie = TRUE;
return;
/* Load the destination operand from an FPU register */
DestOperand = &FPU_ST(ModRegRm.SecondRegister);
}
else
{
/* Load the source operand from an FPU register */
SourceOperand = &FPU_ST(ModRegRm.SecondRegister);
/* The destination operand is ST0 */
DestOperand = &FPU_ST(0);
}
}
/* Check the operation */
@ -912,6 +926,8 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDE)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
PFAST486_FPU_DATA_REG SourceOperand, DestOperand;
BOOLEAN PopStack = FALSE;
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
@ -923,10 +939,117 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDE)
FPU_CHECK();
#ifndef FAST486_NO_FPU
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
#else
/* Do nothing */
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{
/* Invalid operation */
State->FpuStatus.Ie = TRUE;
return;
}
if (ModRegRm.Memory)
{
SHORT Value;
FAST486_FPU_DATA_REG MemoryData;
/* Load the source operand from memory */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, (PUSHORT)&Value))
{
/* Exception occurred */
return;
}
Fast486FpuFromInteger(State, (LONGLONG)Value, &MemoryData);
SourceOperand = &MemoryData;
/* The destination operand is ST0 */
DestOperand = &FPU_ST(0);
}
else
{
/* FCOMPP check */
if ((ModRegRm.Register == 3) && (ModRegRm.SecondRegister != 1))
{
/* Invalid */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* The source operand is ST0 */
SourceOperand = &FPU_ST(0);
/* Load the destination operand from a register */
DestOperand = &FPU_ST(ModRegRm.SecondRegister);
if (FPU_GET_TAG(ModRegRm.SecondRegister) == FPU_TAG_EMPTY)
{
/* Invalid operation */
State->FpuStatus.Ie = TRUE;
return;
}
PopStack = TRUE;
}
/* Check the operation */
switch (ModRegRm.Register)
{
/* FIADD / FADDP */
case 0:
{
Fast486FpuAdd(State, DestOperand, SourceOperand, DestOperand);
break;
}
/* FIMUL / FMULP */
case 1:
{
Fast486FpuMultiply(State, DestOperand, SourceOperand, DestOperand);
break;
}
/* FICOM / FCOMP */
case 2:
/* FICOMP / FCOMPP */
case 3:
{
Fast486FpuCompare(State, DestOperand, SourceOperand);
if (ModRegRm.Register == 3) Fast486FpuPop(State);
break;
}
/* FISUB / FSUBRP */
case 4:
{
Fast486FpuSubtract(State, DestOperand, SourceOperand, DestOperand);
break;
}
/* FISUBR / FSUBP */
case 5:
{
Fast486FpuSubtract(State, SourceOperand, DestOperand, DestOperand);
break;
}
/* FIDIV / FDIVRP */
case 6:
{
Fast486FpuDivide(State, DestOperand, SourceOperand, DestOperand);
break;
}
/* FIDIVR / FDIVP */
case 7:
{
Fast486FpuDivide(State, SourceOperand, DestOperand, DestOperand);
break;
}
}
if (PopStack) Fast486FpuPop(State);
#endif
}