From ccd59d09a9d0c75b86185b89d8246e40b5f01168 Mon Sep 17 00:00:00 2001
From: Andre Przywara <andre.przywara@amd.com>
Date: Sat, 19 Sep 2009 00:30:47 +0200
Subject: [PATCH] target-i386: add lock mov cr0 = cr8
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>
---
target-i386/translate.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/target-i386/translate.c b/target-i386/translate.c
index 5b11d7f63e..0f62a97286 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -7351,6 +7351,10 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start)
ot = OT_QUAD;
else
ot = OT_LONG;
+ if ((prefixes & PREFIX_LOCK) && (reg == 0) &&
+ (s->cpuid_ext3_features & CPUID_EXT3_CR8LEG)) {
+ reg = 8;
+ }
switch(reg) {
case 0:
case 2: