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target-i386: Ensure always-1 bits on DR6 can't be cleared

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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>
This commit is contained in:
Eduardo Habkost 2015-10-07 17:19:18 -03:00
parent d005233923
commit 462f8ed1f1
1 changed files with 1 additions and 1 deletions
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2
target-i386/bpt_helper.c
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@ -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) {