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target-i386: Avoid repeated calls to the bnd_jmp helper

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Two flags were tested the wrong way.

Backports commit 8b33e82b863d1c6fce7e69a41f6c96a8e15b73fb from qemu
This commit is contained in:
Paolo Bonzini 2018-02-21 21:13:20 -05:00 committed by Lioncash
parent f7bff04b7b
commit bdf1189046
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 5 additions and 5 deletions
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10
qemu/target-i386/translate.c
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@ -2750,12 +2750,12 @@ static void gen_bnd_jmp(DisasContext *s)
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGv_ptr cpu_env = tcg_ctx->cpu_env;
/* 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(tcg_ctx, cpu_env);
}
}