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X86: Fix segment limit checking.

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Gabe Black 2009-02-25 10:17:08 -08:00
parent 2f31643db5
commit 08f3a126d5
1 changed files with 13 additions and 11 deletions
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24
src/arch/x86/isa/microops/regop.isa
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@ -1192,10 +1192,12 @@ let {{
attr.dpl = desc.dpl;
attr.defaultSize = desc.d;
if (!desc.s) {
SegBaseDest = SegBaseDest;
SegLimitDest = SegLimitDest;
SegAttrDest = SegAttrDest;
panic("System segment encountered.\\n");
// The expand down bit happens to be set for gates.
if (desc.type.e) {
panic("Gate descriptor encountered.\\n");
}
attr.readable = 1;
attr.writable = 1;
} else {
if (!desc.p)
panic("Segment not present.\\n");
@ -1207,14 +1209,14 @@ let {{
attr.readable = 1;
attr.writable = desc.type.w;
}
Addr base = desc.baseLow | (desc.baseHigh << 24);
Addr limit = desc.limitLow | (desc.limitHigh << 16);
if (desc.g)
limit = (limit << 12) | mask(12);
SegBaseDest = base;
SegLimitDest = limit;
SegAttrDest = attr;
}
Addr base = desc.baseLow | (desc.baseHigh << 24);
Addr limit = desc.limitLow | (desc.limitHigh << 16);
if (desc.g)
limit = (limit << 12) | mask(12);
SegBaseDest = base;
SegLimitDest = limit;
SegAttrDest = attr;
} else {
SegBaseDest = SegBaseDest;
SegLimitDest = SegLimitDest;