diff options
Diffstat (limited to 'src/arch/x86/tlb.cc')
| -rw-r--r-- | src/arch/x86/tlb.cc | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/src/arch/x86/tlb.cc b/src/arch/x86/tlb.cc index 5d101a5ae..ba8f63a0e 100644 --- a/src/arch/x86/tlb.cc +++ b/src/arch/x86/tlb.cc @@ -574,14 +574,18 @@ TLB::translate(RequestPtr &req, ThreadContext *tc, bool write, bool execute) // 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); - if (!attr.readable && !write && !execute) - return new GeneralProtection(0); + bool expandDown = false; + if (seg >= SEGMENT_REG_ES && seg <= SEGMENT_REG_HS) { + SegAttr attr = tc->readMiscRegNoEffect(MISCREG_SEG_ATTR(seg)); + if (!attr.writable && write) + return new GeneralProtection(0); + if (!attr.readable && !write && !execute) + return new GeneralProtection(0); + expandDown = attr.expandDown; + } Addr base = tc->readMiscRegNoEffect(MISCREG_SEG_BASE(seg)); Addr limit = tc->readMiscRegNoEffect(MISCREG_SEG_LIMIT(seg)); - if (!attr.expandDown) { + if (expandDown) { DPRINTF(TLB, "Checking an expand down segment.\n"); // We don't have to worry about the access going around the // end of memory because accesses will be broken up into |