diff options
| -rw-r--r-- | target-i386/translate.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c index 53dee79afd..cd214a6180 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -2409,12 +2409,12 @@ static void gen_reset_hflag(DisasContext *s, uint32_t mask) /* Clear BND registers during legacy branches. */ static void gen_bnd_jmp(DisasContext *s) { - /* Do nothing if BND prefix present, MPX is disabled, or if the - BNDREGs are known to be in INIT state already. The helper - itself will check BNDPRESERVE at runtime. */ + /* Clear the registers only if BND prefix is missing, MPX is enabled, + and if the BNDREGs are known to be in use (non-zero) already. + The helper itself will check BNDPRESERVE at runtime. */ if ((s->prefix & PREFIX_REPNZ) == 0 - && (s->flags & HF_MPX_EN_MASK) == 0 - && (s->flags & HF_MPX_IU_MASK) == 0) { + && (s->flags & HF_MPX_EN_MASK) != 0 + && (s->flags & HF_MPX_IU_MASK) != 0) { gen_helper_bnd_jmp(cpu_env); } } |