tree 37e24b078323daea27d996655cd7e5dd3b19ea66
parent d7c2e2db28eb7e8f2ed7467fa2f2c59026b206d1
author Peter Maydell <peter.maydell@linaro.org> 1432895340 +0100
committer Peter Maydell <peter.maydell@linaro.org> 1432895340 +0100

target-arm: Avoid buffer overrun on UNPREDICTABLE ldrd/strd

A LDRD or STRD where rd is not an even number is UNPREDICTABLE.
We were letting this fall through, which is OK unless rd is 15,
in which case we would attempt to do a load_reg or store_reg
to a nonexistent r16 for the second half of the double-word.
Catch the odd-numbered-rd cases and UNDEF them instead.

To do this we rearrange the structure of the code a little
so we can put the UNDEF catches at the top before we've
allocated TCG temporaries.

Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1431348973-21315-1-git-send-email-peter.maydell@linaro.org