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target-i386: add lock mov cr0 = cr8

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AMD CPUs featuring a shortcut to access CR8 even from 32-bit mode.
If you use the LOCK prefix with "mov CR0", it accesses CR8 instead.
This behavior is guarded by the CR8_LEGACY CPUID bit
(Fn8000_0001:ECX[1]).

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Andre Przywara 2009-09-19 00:30:47 +02:00 committed by Aurelien Jarno
parent 5f0ce17ffc
commit ccd59d09a9
1 changed files with 4 additions and 0 deletions
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4
target-i386/translate.c
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@ -7351,6 +7351,10 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start)
ot = OT_QUAD; ot = OT_QUAD;
else else
ot = OT_LONG; ot = OT_LONG;
if ((prefixes & PREFIX_LOCK) && (reg == 0) &&
(s->cpuid_ext3_features & CPUID_EXT3_CR8LEG)) {
reg = 8;
}
switch(reg) { switch(reg) {
case 0: case 0:
case 2: case 2: