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[v3,8/9] target-i386: Ensure always-1 bits on DR6 can't be cleared

Message ID 1445276410-5031-9-git-send-email-ehabkost@redhat.com
State New
Headers show

Commit Message

Eduardo Habkost Oct. 19, 2015, 5:40 p.m. UTC 
Bits 4-11 and 16-31 on DR6 are documented as always 1, so ensure they
can't be cleared by software.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 target-i386/bpt_helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/target-i386/bpt_helper.c b/target-i386/bpt_helper.c
index 144cfd4..dac1b1a 100644
--- a/target-i386/bpt_helper.c
+++ b/target-i386/bpt_helper.c
@@ -262,7 +262,7 @@  void helper_set_dr(CPUX86State *env, int reg, target_ulong t0)
         }
         /* fallthru */
     case 6:
-        env->dr[6] = t0;
+        env->dr[6] = t0 | DR6_FIXED_1;
         return;
     case 5:
         if (env->cr[4] & CR4_DE_MASK) {