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| author | Gabe Black <gblack@eecs.umich.edu> | 2008-06-12 00:51:50 -0400 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2008-06-12 00:51:50 -0400 |
| commit | b05299253fdd5a8a913f2799b7cdd2df040c8559 (patch) | |
| tree | 47a0c9751462537e2d74d7855542e419f7ab43f3 /src/arch/x86/tlb.cc | |
| parent | a8384311d544391b03ff55f9384fdf8da2fa8bf6 (diff) | |
| download | gem5-b05299253fdd5a8a913f2799b7cdd2df040c8559.tar.xz | |
X86: In non 64bit mode, throw a fault when a NULL segment is accessed.
Diffstat (limited to 'src/arch/x86/tlb.cc')
| -rw-r--r-- | src/arch/x86/tlb.cc | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/arch/x86/tlb.cc b/src/arch/x86/tlb.cc index f5e214a88..5d101a5ae 100644 --- a/src/arch/x86/tlb.cc +++ b/src/arch/x86/tlb.cc @@ -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); |