Changeset 47328 in vbox for trunk/include/iprt

Timestamp:

Jul 22, 2013 10:50:49 PM (11 years ago)

Author:

vboxsync

Message:

CPUM,++: Fix DR6 and DR7 read-as-1 (RA1) and read-as-zero (RAZ) values on load since REM didn't set them right for years. Introduced constants for these values.

File:

• trunk/include/iprt/x86.h (modified) (2 diffs)

trunk/include/iprt/x86.h

@@ -745 +745 @@
 /** Value of DR6 after powerup/reset. */
 #define X86_DR6_INIT_VAL                    UINT64_C(0xFFFF0FF0)
+/** Bits which must be 1s in DR6. */
+#define X86_DR6_RA1_MASK                    UINT64_C(0xffff0ff0)
+/** Bits which must be 0s in DR6. */
+#define X86_DR6_RAZ_MASK                    RT_BIT_64(12)
+/** Bits which must be 0s on writes to DR6. */
+#define X86_DR6_MBZ_MASK                    UINT64_C(0xffffffff00000000)
 /** @} */
 
@@ -791 +797 @@
 #define X86_DR7_LEN3_MASK                   (3 << 30)
 
-/** Bits which must be 1s. */
-#define X86_DR7_MB1_MASK                    (RT_BIT(10))
+/** Bits which reads as 1s. */
+#define X86_DR7_RA1_MASK                    (RT_BIT(10))
+/** Bits which reads as zeros. */
+#define X86_DR7_RAZ_MASK                    UINT64_C(0x0000d800)
+/** Bits which must be 0s when writing to DR7. */
+#define X86_DR7_MBZ_MASK                    UINT64_C(0xffffffff00000000)
 
 /** Calcs the L bit of Nth breakpoint.