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target/i386: Fix decoding of certain BMI instructions 

This patch fixes a translation bug for a subset of x86 BMI instructions
such as the following:

   c4 e2 f9 f7 c0                shlxq   %rax, %rax, %rax

Currently, these incorrectly generate an undefined instruction exception
when SSE is disabled via CR4, while instructions like "shrxq" work fine.

The problem appears to be related to BMI instructions encoded using VEX
and with a mandatory prefix of "0x66" (data). Instructions with this
data prefix (such as shlxq) are currently rejected. Instructions with
other mandatory prefixes (such as shrxq) translate as expected.

This patch removes the incorrect check in "gen_sse" that causes the
exception to be generated. For the non-BMI cases, the check is
redundant: prefixes are already checked at line 3696.

Buglink: https://bugs.launchpad.net/qemu/+bug/1748296

Signed-off-by: David Greenaway <dgreenaway@google.com>
Message-Id: <20210114063958.1508050-1-dgreenaway@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Greenaway 2021-01-14 17:39:58 +11:00 committed by Paolo Bonzini
parent e34e47eb28
commit 51909241d2
1 changed files with 1 additions and 1 deletions
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2
target/i386/tcg/translate.c
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@ -3075,7 +3075,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
}
if (is_xmm
&& !(s->flags & HF_OSFXSR_MASK)
&& ((b != 0x38 && b != 0x3a) || (s->prefix & PREFIX_DATA))) {
&& (b != 0x38 && b != 0x3a)) {
goto unknown_op;
}
if (b == 0x0e) {