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X86: Add a check type for interrupt gates.

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This commit is contained in:
Gabe Black 2008-10-12 20:33:37 -07:00
parent 15f5bb3055
commit 30feb90c1c
2 changed files with 7 additions and 2 deletions
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2
src/arch/x86/isa/microasm.isa
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@ -85,7 +85,7 @@ let {{
assembler.symbols["%ss" % letter.lower()] = "SEGMENT_REG_%sS" % letter
# Add in symbols for the various checks of segment selectors.
for check in ("NoCheck", "CSCheck", "CallGateCheck",
for check in ("NoCheck", "CSCheck", "CallGateCheck", "IntGateCheck",
"SSCheck", "IretCheck", "IntCSCheck"):
assembler.symbols[check] = "Seg%s" % check

7
src/arch/x86/isa/microops/regop.isa
View file

@ -233,7 +233,7 @@ output header {{
uint64_t &quotient, uint64_t &remainder);
enum SegmentSelectorCheck {
SegNoCheck, SegCSCheck, SegCallGateCheck,
SegNoCheck, SegCSCheck, SegCallGateCheck, SegIntGateCheck,
SegSSCheck, SegIretCheck, SegIntCSCheck
};
}};
@ -1041,6 +1041,11 @@ let {{
panic("CS checks for far calls/jumps through call gates"
"not implemented.\\n");
break;
case SegIntGateCheck:
if (desc.dpl < m5reg.cpl) {
return new GeneralProtection((uint16_t)selector);
}
break;
case SegSSCheck:
if (selector.si || selector.ti) {
if (!desc.p) {