divdu (without a dot) sometimes updates cr0, even though it shouldn't.
The reason is that gen_op_arith_divd() checks Rc(ctx->opcode), which is
not initialized. This field is initialized only for instructions that
go through decode_legacy(), and not decodetree.
There already was a similar issue fixed in commit 86e6202a57b1
("target/ppc: Make divw[u] handler method decodetree compatible.").
It's not immediately clear what else may access the uninitialized
ctx->opcode, so instead of playing whack-a-mole and changing the check
to compute_rc0, simply initialize ctx->opcode.
Cc: qemu-stable@nongnu.org
Fixes: 99082815f17f ("target/ppc: Add infrastructure for prefixed insns")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
target/ppc/translate.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)