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target-i386: Ensure bit 10 on DR7 is never cleared 

Bit 10 of DR7 is documented as always set to 1, so ensure that's
always the case.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Eduardo Habkost 2015-10-08 17:10:27 -03:00
parent 36eb6e0967
commit 9055330ffb
1 changed files with 2 additions and 0 deletions
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2
target-i386/bpt_helper.c
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@ -85,6 +85,8 @@ void cpu_x86_update_dr7(CPUX86State *env, uint32_t new_dr7)
target_ulong old_dr7 = env->dr[7];
int i;
new_dr7 |= DR7_FIXED_1;
/* If nothing is changing except the global/local enable bits,
then we can make the change more efficient. */
if (((old_dr7 ^ new_dr7) & ~0xff) == 0) {