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X86: Some segment selectors can be used when "NULL".

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This commit is contained in:
Gabe Black 2009-04-19 03:41:10 -07:00
parent a0cc081997
commit 3b1b21cb15
1 changed files with 4 additions and 1 deletions
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5
src/arch/x86/tlb.cc
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@ -571,7 +571,10 @@ TLB::translate(RequestPtr req, ThreadContext *tc, Translation *translation,
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)))
if (!(seg == SEGMENT_REG_TSG || seg == SYS_SEGMENT_REG_IDTR ||
seg == SEGMENT_REG_HS || seg == SEGMENT_REG_LS ||
seg == SEGMENT_REG_MS)
&& !tc->readMiscRegNoEffect(MISCREG_SEG_SEL(seg)))
return new GeneralProtection(0);
bool expandDown = false;
SegAttr attr = tc->readMiscRegNoEffect(MISCREG_SEG_ATTR(seg));