[0/3] target/s390x: Fix the "ignored match" case in VSTRS

Message

Ilya Leoshkevich Aug. 4, 2023, 11:03 p.m. UTC

Hi,

this series should hopefully fix the issue with __strstr_arch13(),
which Claudio reported. I have to admit I did not manage to fully
reproduce it, but at least with this change the traces of a simple test
from TCG and real hardware match.

I've also fuzzed the changed helper and strstr() itself; not sure
whether anything generic may come out of it, but here are the links
anyway [1] [2].

Patch 1 makes glibc pick __strstr_arch13() in qemu-user, patch 2 is the
fix and patch 3 is the test (generated from Claudio's strings and
further fuzzer's findings).

[1] https://gist.github.com/iii-i/5adad06d911c46079d4388001b22ab61
[2] https://gist.github.com/iii-i/c425800e75796eae65660491ac511356

Ilya Leoshkevich (3):
  linux-user/elfload: Enable vxe2 on s390x
  target/s390x: Fix the "ignored match" case in VSTRS
  tests/tcg/s390x: Test VSTRS

 linux-user/elfload.c                 |  1 +
 target/s390x/tcg/vec_string_helper.c | 54 ++++++-----------
 tests/tcg/s390x/Makefile.target      |  1 +
 tests/tcg/s390x/vxeh2_vstrs.c        | 88 ++++++++++++++++++++++++++++
 4 files changed, 107 insertions(+), 37 deletions(-)
 create mode 100644 tests/tcg/s390x/vxeh2_vstrs.c