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[NTOSKRNL]: MOV CRX, YYY and MOV YYY, CRX, as well as the DR equivalents were not correctly detected as privileged instructions in the GPF handler. Fixes Winetests.

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[NTOSKRNL]: The "Write" bit in the x86 Error Code is not bit 1, it is bit 2. Fix all the GPF handlers to check for bit 2 instead when determining if an exception was due to read or write. Fixes Winetests.
I'll say it nicely this time for Timo: when you rewrite ASM, do it carefully :)

svn path=/trunk/; revision=55735
This commit is contained in:
Alex Ionescu 2012-02-20 06:43:54 +00:00
parent 1e172203a6
commit 0e2219f054
1 changed files with 13 additions and 6 deletions
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19
reactos/ntoskrnl/ke/i386/traphdlr.c
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@ -970,6 +970,12 @@ KiTrap0DHandler(IN PKTRAP_FRAME TrapFrame)
}
/* Check for privileged instructions */
DPRINT("Instruction (%d) at fault: %lx %lx %lx %lx\n",
i,
Instructions[i],
Instructions[i + 1],
Instructions[i + 2],
Instructions[i + 3]);
if (Instruction == 0xF4) // HLT
{
/* HLT is privileged */
@ -988,10 +994,11 @@ KiTrap0DHandler(IN PKTRAP_FRAME TrapFrame)
(Instructions[i + 1] == 0x08) || // INVD
(Instructions[i + 1] == 0x09) || // WBINVD
(Instructions[i + 1] == 0x35) || // SYSEXIT
(Instructions[i + 1] == 0x26) || // MOV DR, XXX
(Instructions[i + 1] == 0x21) || // MOV DR, XXX
(Instructions[i + 1] == 0x06) || // CLTS
(Instructions[i + 1] == 0x20) || // MOV CR, XXX
(Instructions[i + 1] == 0x24) || // MOV YYY, DR
(Instructions[i + 1] == 0x22) || // MOV XXX, CR
(Instructions[i + 1] == 0x23) || // MOV YYY, DR
(Instructions[i + 1] == 0x30) || // WRMSR
(Instructions[i + 1] == 0x33)) // RDPMC
// INVLPG, INVLPGA, SYSRET
@ -1192,7 +1199,7 @@ KiTrap0EHandler(IN PKTRAP_FRAME TrapFrame)
KeBugCheckWithTf(IRQL_NOT_LESS_OR_EQUAL,
Cr2,
-1,
TrapFrame->ErrCode & 1,
TrapFrame->ErrCode & 2 ? TRUE : FALSE,
TrapFrame->Eip,
TrapFrame);
}
@ -1254,7 +1261,7 @@ KiTrap0EHandler(IN PKTRAP_FRAME TrapFrame)
/* This status code is repurposed so we can recognize it later */
KiDispatchException2Args(KI_EXCEPTION_ACCESS_VIOLATION,
TrapFrame->Eip,
TrapFrame->ErrCode & 1,
TrapFrame->ErrCode & 2 ? TRUE : FALSE,
Cr2,
TrapFrame);
}
@ -1264,7 +1271,7 @@ KiTrap0EHandler(IN PKTRAP_FRAME TrapFrame)
/* These faults only have two parameters */
KiDispatchException2Args(Status,
TrapFrame->Eip,
TrapFrame->ErrCode & 1,
TrapFrame->ErrCode & 2 ? TRUE : FALSE,
Cr2,
TrapFrame);
}
@ -1273,7 +1280,7 @@ KiTrap0EHandler(IN PKTRAP_FRAME TrapFrame)
KiDispatchExceptionFromTrapFrame(STATUS_IN_PAGE_ERROR,
TrapFrame->Eip,
3,
TrapFrame->ErrCode & 1,
TrapFrame->ErrCode & 2 ? TRUE : FALSE,
Cr2,
Status,
TrapFrame);