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X86: Truncate descriptors to 16 bits.

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This commit is contained in:
Gabe Black 2008-06-12 00:49:16 -04:00
parent 6106b05b6e
commit bbc1f394ff
1 changed files with 6 additions and 6 deletions
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12
src/arch/x86/isa/microops/regop.isa
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@ -988,20 +988,20 @@ let {{
class Chks(SegOp):
code = '''
// The selector is in source 1.
// The selector is in source 1 and can be at most 16 bits.
SegSelector selector = psrc1;
// Compute the address of the descriptor and set DestReg to it.
if (selector.ti) {
// A descriptor in the LDT
Addr target = (selector.esi << 3) + LDTRBase;
if (!LDTRSel || (selector.esi << 3) + dataSize > LDTRLimit)
Addr target = (selector.si << 3) + LDTRBase;
if (!LDTRSel || (selector.si << 3) + dataSize > LDTRLimit)
fault = new GeneralProtection(selector & mask(16));
DestReg = target;
} else {
// A descriptor in the GDT
Addr target = (selector.esi << 3) + GDTRBase;
if ((selector.esi << 3) + dataSize > GDTRLimit)
Addr target = (selector.si << 3) + GDTRBase;
if ((selector.si << 3) + dataSize > GDTRLimit)
fault = new GeneralProtection(selector & mask(16));
DestReg = target;
}
@ -1009,7 +1009,7 @@ let {{
flag_code = '''
// Check for a NULL selector and set ZF,EZF appropriately.
ccFlagBits = ccFlagBits & ~(ext & (ZFBit | EZFBit));
if (!selector.esi && !selector.ti)
if (!selector.si && !selector.ti)
ccFlagBits = ccFlagBits | (ext & (ZFBit | EZFBit));
'''