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target/i386: Generate #UD for LOCK on a register increment 

Fix a TCG crash due to attempting an atomic increment
operation without having set up the address first.
This is a similar case to that dealt with in commit
e84fcd7f66, and we fix it in the same way.

Fixes: https://bugs.launchpad.net/qemu/+bug/1807675
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20190328104750.25046-1-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2019-03-28 10:47:50 +00:00
parent 120cba7ff1
commit 8cb2ca3d74
1 changed files with 5 additions and 0 deletions
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5
target/i386/translate.c
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@ -1398,6 +1398,11 @@ static void gen_op(DisasContext *s1, int op, TCGMemOp ot, int d)
static void gen_inc(DisasContext *s1, TCGMemOp ot, int d, int c)
{
if (s1->prefix & PREFIX_LOCK) {
if (d != OR_TMP0) {
/* Lock prefix when destination is not memory */
gen_illegal_opcode(s1);
return;
}
tcg_gen_movi_tl(s1->T0, c > 0 ? 1 : -1);
tcg_gen_atomic_add_fetch_tl(s1->T0, s1->A0, s1->T0,
s1->mem_index, ot | MO_LE);