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[FAST486]

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Reading/writing to memory should #SS(0) when the segment is the stack segment,
and #GP(0) otherwise. It should never generate #NP.


svn path=/trunk/; revision=69427
This commit is contained in:
Aleksandar Andrejevic 2015-10-02 15:11:24 +00:00
parent a1ae94ce52
commit 7fe13943a9
1 changed files with 17 additions and 13 deletions
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30
reactos/lib/fast486/common.c
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@ -42,6 +42,8 @@ Fast486ReadMemory(PFAST486_STATE State,
{
ULONG LinearAddress;
PFAST486_SEG_REG CachedDescriptor;
FAST486_EXCEPTIONS Exception = SegmentReg != FAST486_REG_SS
? FAST486_EXCEPTION_GP : FAST486_EXCEPTION_SS;
ASSERT(SegmentReg < FAST486_NUM_SEG_REGS);
@ -53,7 +55,7 @@ Fast486ReadMemory(PFAST486_STATE State,
if ((Offset + Size - 1) > CachedDescriptor->Limit)
{
/* Read beyond limit */
Fast486Exception(State, FAST486_EXCEPTION_GP);
Fast486Exception(State, Exception);
return FALSE;
}
}
@ -62,7 +64,7 @@ Fast486ReadMemory(PFAST486_STATE State,
if (Offset < CachedDescriptor->Limit)
{
/* Read beyond limit */
Fast486Exception(State, FAST486_EXCEPTION_GP);
Fast486Exception(State, Exception);
return FALSE;
}
}
@ -74,14 +76,14 @@ Fast486ReadMemory(PFAST486_STATE State,
if (!CachedDescriptor->Present)
{
Fast486Exception(State, FAST486_EXCEPTION_NP);
Fast486Exception(State, Exception);
return FALSE;
}
if ((!InstFetch && (CachedDescriptor->Rpl > CachedDescriptor->Dpl))
|| (Fast486GetCurrentPrivLevel(State) > CachedDescriptor->Dpl))
{
Fast486Exception(State, FAST486_EXCEPTION_GP);
Fast486Exception(State, Exception);
return FALSE;
}
@ -90,7 +92,7 @@ Fast486ReadMemory(PFAST486_STATE State,
if (!CachedDescriptor->Executable)
{
/* Data segment not executable */
Fast486Exception(State, FAST486_EXCEPTION_GP);
Fast486Exception(State, Exception);
return FALSE;
}
}
@ -99,7 +101,7 @@ Fast486ReadMemory(PFAST486_STATE State,
if (CachedDescriptor->Executable && (!CachedDescriptor->ReadWrite))
{
/* Code segment not readable */
Fast486Exception(State, FAST486_EXCEPTION_GP);
Fast486Exception(State, Exception);
return FALSE;
}
}
@ -166,6 +168,8 @@ Fast486WriteMemory(PFAST486_STATE State,
{
ULONG LinearAddress;
PFAST486_SEG_REG CachedDescriptor;
FAST486_EXCEPTIONS Exception = SegmentReg != FAST486_REG_SS
? FAST486_EXCEPTION_GP : FAST486_EXCEPTION_SS;
ASSERT(SegmentReg < FAST486_NUM_SEG_REGS);
@ -177,7 +181,7 @@ Fast486WriteMemory(PFAST486_STATE State,
if ((Offset + Size - 1) > CachedDescriptor->Limit)
{
/* Write beyond limit */
Fast486Exception(State, FAST486_EXCEPTION_GP);
Fast486Exception(State, Exception);
return FALSE;
}
}
@ -185,8 +189,8 @@ Fast486WriteMemory(PFAST486_STATE State,
{
if (Offset < CachedDescriptor->Limit)
{
/* Read beyond limit */
Fast486Exception(State, FAST486_EXCEPTION_GP);
/* Write beyond limit */
Fast486Exception(State, Exception);
return FALSE;
}
}
@ -198,27 +202,27 @@ Fast486WriteMemory(PFAST486_STATE State,
if (!CachedDescriptor->Present)
{
Fast486Exception(State, FAST486_EXCEPTION_NP);
Fast486Exception(State, Exception);
return FALSE;
}
if ((CachedDescriptor->Rpl > CachedDescriptor->Dpl)
|| (Fast486GetCurrentPrivLevel(State) > CachedDescriptor->Dpl))
{
Fast486Exception(State, FAST486_EXCEPTION_GP);
Fast486Exception(State, Exception);
return FALSE;
}
if (CachedDescriptor->Executable)
{
/* Code segment not writable */
Fast486Exception(State, FAST486_EXCEPTION_GP);
Fast486Exception(State, Exception);
return FALSE;
}
else if (!CachedDescriptor->ReadWrite)
{
/* Data segment not writeable */
Fast486Exception(State, FAST486_EXCEPTION_GP);
Fast486Exception(State, Exception);
return FALSE;
}
}