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[FAST486]

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Support legacy (286) Task State Segments in Fast486InterruptInternal and Fast486CallGate.


svn path=/trunk/; revision=67593
This commit is contained in:
Aleksandar Andrejevic 2015-05-07 13:38:29 +00:00
parent 26ba3ae4f6
commit e37ae6f6bd
1 changed files with 75 additions and 26 deletions
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101
reactos/lib/fast486/common.c
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@ -315,12 +315,16 @@ Fast486InterruptInternal(PFAST486_STATE State,
if ((OldCpl > GET_SEGMENT_RPL(IdtEntry->Selector)) || State->Flags.Vm)
{
FAST486_TSS Tss;
PFAST486_LEGACY_TSS LegacyTss = (PFAST486_LEGACY_TSS)&Tss;
USHORT NewSs;
ULONG NewEsp;
/* Read the TSS */
if (!Fast486ReadLinearMemory(State,
State->TaskReg.Base,
&Tss,
sizeof(Tss)))
State->TaskReg.Limit >= sizeof(FAST486_TSS)
? sizeof(FAST486_TSS) : sizeof(FAST486_LEGACY_TSS)))
{
/* Exception occurred */
return FALSE;
@ -334,36 +338,48 @@ Fast486InterruptInternal(PFAST486_STATE State,
{
case 0:
{
if (!Fast486LoadSegment(State, FAST486_REG_SS, Tss.Ss0))
if (State->TaskReg.Limit >= sizeof(FAST486_TSS))
{
/* Exception occurred */
return FALSE;
NewSs = Tss.Ss0;
NewEsp = Tss.Esp0;
}
else
{
NewSs = LegacyTss->Ss0;
NewEsp = LegacyTss->Sp0;
}
State->GeneralRegs[FAST486_REG_ESP].Long = Tss.Esp0;
break;
}
case 1:
{
if (!Fast486LoadSegment(State, FAST486_REG_SS, Tss.Ss1))
if (State->TaskReg.Limit >= sizeof(FAST486_TSS))
{
/* Exception occurred */
return FALSE;
NewSs = Tss.Ss1;
NewEsp = Tss.Esp1;
}
else
{
NewSs = LegacyTss->Ss1;
NewEsp = LegacyTss->Sp1;
}
State->GeneralRegs[FAST486_REG_ESP].Long = Tss.Esp1;
break;
}
case 2:
{
if (!Fast486LoadSegment(State, FAST486_REG_SS, Tss.Ss2))
if (State->TaskReg.Limit >= sizeof(FAST486_TSS))
{
/* Exception occurred */
return FALSE;
NewSs = Tss.Ss2;
NewEsp = Tss.Esp2;
}
else
{
NewSs = LegacyTss->Ss2;
NewEsp = LegacyTss->Sp2;
}
State->GeneralRegs[FAST486_REG_ESP].Long = Tss.Esp2;
break;
}
@ -374,6 +390,14 @@ Fast486InterruptInternal(PFAST486_STATE State,
ASSERT(FALSE);
}
}
if (!Fast486LoadSegment(State, FAST486_REG_SS, NewSs))
{
/* Exception occurred */
return FALSE;
}
State->GeneralRegs[FAST486_REG_ESP].Long = NewEsp;
}
/* Load new CS */
@ -935,6 +959,7 @@ Fast486CallGate(PFAST486_STATE State,
FAST486_GDT_ENTRY NewCodeSegment;
BOOLEAN GateSize = (Gate->Type == FAST486_CALL_GATE_SIGNATURE);
FAST486_TSS Tss;
PFAST486_LEGACY_TSS LegacyTss = (PFAST486_LEGACY_TSS)&Tss;
USHORT OldCs = State->SegmentRegs[FAST486_REG_CS].Selector;
ULONG OldEip = State->InstPtr.Long;
USHORT OldCpl = State->Cpl;
@ -984,11 +1009,15 @@ Fast486CallGate(PFAST486_STATE State,
{
if (Call)
{
USHORT NewSs;
ULONG NewEsp;
/* Read the TSS */
if (!Fast486ReadLinearMemory(State,
State->TaskReg.Base,
&Tss,
sizeof(Tss)))
State->TaskReg.Limit >= sizeof(FAST486_TSS)
? sizeof(FAST486_TSS) : sizeof(FAST486_LEGACY_TSS)))
{
/* Exception occurred */
return FALSE;
@ -1002,36 +1031,48 @@ Fast486CallGate(PFAST486_STATE State,
{
case 0:
{
if (!Fast486LoadSegment(State, FAST486_REG_SS, Tss.Ss0))
if (State->TaskReg.Limit >= sizeof(FAST486_TSS))
{
/* Exception occurred */
return FALSE;
NewSs = Tss.Ss0;
NewEsp = Tss.Esp0;
}
else
{
NewSs = LegacyTss->Ss0;
NewEsp = LegacyTss->Sp0;
}
State->GeneralRegs[FAST486_REG_ESP].Long = Tss.Esp0;
break;
}
case 1:
{
if (!Fast486LoadSegment(State, FAST486_REG_SS, Tss.Ss1))
if (State->TaskReg.Limit >= sizeof(FAST486_TSS))
{
/* Exception occurred */
return FALSE;
NewSs = Tss.Ss1;
NewEsp = Tss.Esp1;
}
else
{
NewSs = LegacyTss->Ss1;
NewEsp = LegacyTss->Sp1;
}
State->GeneralRegs[FAST486_REG_ESP].Long = Tss.Esp1;
break;
}
case 2:
{
if (!Fast486LoadSegment(State, FAST486_REG_SS, Tss.Ss2))
if (State->TaskReg.Limit >= sizeof(FAST486_TSS))
{
/* Exception occurred */
return FALSE;
NewSs = Tss.Ss2;
NewEsp = Tss.Esp2;
}
else
{
NewSs = LegacyTss->Ss2;
NewEsp = LegacyTss->Sp2;
}
State->GeneralRegs[FAST486_REG_ESP].Long = Tss.Esp2;
break;
}
@ -1042,6 +1083,14 @@ Fast486CallGate(PFAST486_STATE State,
ASSERT(FALSE);
}
}
if (!Fast486LoadSegment(State, FAST486_REG_SS, NewSs))
{
/* Exception occurred */
return FALSE;
}
State->GeneralRegs[FAST486_REG_ESP].Long = NewEsp;
}
else if (!NewCodeSegment.DirConf)
{