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X86: In non 64bit mode, throw a fault when a NULL segment is accessed.

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Gabe Black 2008-06-12 00:51:50 -04:00
parent a8384311d5
commit b05299253f
1 changed files with 3 additions and 0 deletions
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3
src/arch/x86/tlb.cc
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@ -571,6 +571,9 @@ TLB::translate(RequestPtr &req, ThreadContext *tc, bool write, bool execute)
// If we're not in 64-bit mode, do protection/limit checks
if (!efer.lma || !csAttr.longMode) {
DPRINTF(TLB, "Not in long mode. Checking segment protection.\n");
// Check for a NULL segment selector.
if (!tc->readMiscRegNoEffect(MISCREG_SEG_SEL(seg)))
return new GeneralProtection(0);
SegAttr attr = tc->readMiscRegNoEffect(MISCREG_SEG_ATTR(seg));
if (!attr.writable && write)
return new GeneralProtection(0);