changeset d78df8ebc225 in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=d78df8ebc225
description:
X86: Some segment selectors can be used when "NULL".
diffstat:
1 file changed, 4 insertions(+), 1 deletion(-)
src/arch/x86/tlb.cc | 5 ++++-
diffs (15 lines):
diff -r b62d79c1990b -r d78df8ebc225 src/arch/x86/tlb.cc
--- a/src/arch/x86/tlb.cc Sun Apr 19 03:40:08 2009 -0700
+++ b/src/arch/x86/tlb.cc Sun Apr 19 03:41:10 2009 -0700
@@ -571,7 +571,10 @@
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));
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