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[SOFT386]

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Implement the POPF instruction.


svn path=/branches/ntvdm/; revision=60341
This commit is contained in:
Aleksandar Andrejevic 2013-09-23 14:10:14 +00:00
parent 432372c3b6
commit b5a9d7490a
2 changed files with 130 additions and 3 deletions
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2
include/reactos/libs/soft386/soft386.h
View file

@ -227,7 +227,9 @@ typedef struct _SOFT386_TABLE_REG
typedef union _SOFT386_FLAGS_REG
{
USHORT LowWord;
ULONG Long;
struct
{
ULONG Cf : 1;

131
lib/soft386/opcodes.c
View file

@ -4162,10 +4162,135 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodePushFlags)
SOFT386_OPCODE_HANDLER(Soft386OpcodePopFlags)
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
BOOLEAN Size = State->SegmentRegs[SOFT386_REG_CS].Size;
INT Cpl = Soft386GetCurrentPrivLevel(State);
ULONG NewFlags;
return FALSE;
if (State->PrefixFlags & SOFT386_PREFIX_LOCK)
{
/* Invalid prefix */
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* This OPSIZE prefix toggles the size */
Size = !Size;
}
/* Pop the new flags */
if (!Soft386StackPop(State, &NewFlags))
{
/* Exception occurred */
return FALSE;
}
if (!State->Flags.Vm)
{
/* Check the current privilege level */
if (Cpl == 0)
{
/* Supervisor */
/* Set the flags */
if (Size)
{
/* Memorize the old state of RF */
BOOLEAN OldRf = State->Flags.Rf;
State->Flags.Long = NewFlags;
/* Restore VM and RF */
State->Flags.Vm = FALSE;
State->Flags.Rf = OldRf;
/* Clear VIF and VIP */
State->Flags.Vif = State->Flags.Vip = FALSE;
}
else State->Flags.LowWord = LOWORD(NewFlags);
/* Restore the reserved bits */
State->Flags.AlwaysSet = TRUE;
State->Flags.Reserved0 = FALSE;
State->Flags.Reserved1 = FALSE;
}
else
{
/* User */
/* Memorize the old state of IF and IOPL */
BOOLEAN OldIf = State->Flags.If;
UINT OldIopl = State->Flags.Iopl;
/* Set the flags */
if (Size)
{
/* Memorize the old state of RF */
BOOLEAN OldRf = State->Flags.Rf;
State->Flags.Long = NewFlags;
/* Restore VM and RF */
State->Flags.Vm = FALSE;
State->Flags.Rf = OldRf;
/* Clear VIF and VIP */
State->Flags.Vif = State->Flags.Vip = FALSE;
}
else State->Flags.LowWord = LOWORD(NewFlags);
/* Restore the reserved bits and IOPL */
State->Flags.AlwaysSet = TRUE;
State->Flags.Reserved0 = FALSE;
State->Flags.Reserved1 = FALSE;
State->Flags.Iopl = OldIopl;
/* Check if the user doesn't have the privilege to change IF */
if (Cpl > State->Flags.Iopl)
{
/* Restore IF */
State->Flags.If = OldIf;
}
}
}
else
{
/* Check the IOPL */
if (State->Flags.Iopl == 3)
{
if (Size)
{
/* Memorize the old state of RF, VIF and VIP */
BOOLEAN OldRf = State->Flags.Rf;
BOOLEAN OldVif = State->Flags.Vif;
BOOLEAN OldVip = State->Flags.Vip;
State->Flags.Long = NewFlags;
/* Restore VM, RF, VIF and VIP */
State->Flags.Vm = TRUE;
State->Flags.Rf = OldRf;
State->Flags.Vif = OldVif;
State->Flags.Vip = OldVip;
}
else State->Flags.LowWord = LOWORD(NewFlags);
/* Restore the reserved bits and IOPL */
State->Flags.AlwaysSet = TRUE;
State->Flags.Reserved0 = FALSE;
State->Flags.Reserved1 = FALSE;
State->Flags.Iopl = 3;
}
else
{
/* Call the VM86 monitor */
Soft386ExceptionWithErrorCode(State, SOFT386_EXCEPTION_GP, 0);
}
}
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeSahf)