glibc-2.35 will be released on 2022-02-01. It introduces a user-space ABI
based on the thread pointer to access a reserved area of the TCB.
The rseq selftests originally expected the rseq thread data to sit in a
__rseq_abi TLS variable.
Considering that the rseq ABI only allows a single rseq registration per
thread, both cannot actively coexist in a process.
Adapt the selftests librseq implementation to become compatible with
glibc-2.35. Keep a fallback implementation based on TLS available when
an older glibc is detected.
Feedback is welcome,
Thanks,
Mathieu
Mathieu Desnoyers (5):
selftests/rseq: Remove useless assignment to cpu variable
selftests/rseq: Remove volatile from __rseq_abi
selftests/rseq: Introduce rseq_get_abi() helper
selftests/rseq: Introduce thread pointer getters
selftests/rseq: Uplift rseq selftests for compatibility with
glibc-2.35
tools/testing/selftests/rseq/Makefile | 2 +-
tools/testing/selftests/rseq/param_test.c | 4 +-
tools/testing/selftests/rseq/rseq-arm.h | 32 ++--
tools/testing/selftests/rseq/rseq-arm64.h | 32 ++--
.../rseq/rseq-generic-thread-pointer.h | 25 +++
tools/testing/selftests/rseq/rseq-mips.h | 32 ++--
.../selftests/rseq/rseq-ppc-thread-pointer.h | 30 ++++
tools/testing/selftests/rseq/rseq-ppc.h | 32 ++--
tools/testing/selftests/rseq/rseq-s390.h | 24 +--
.../selftests/rseq/rseq-thread-pointer.h | 19 +++
.../selftests/rseq/rseq-x86-thread-pointer.h | 40 +++++
tools/testing/selftests/rseq/rseq-x86.h | 30 ++--
tools/testing/selftests/rseq/rseq.c | 161 +++++++++---------
tools/testing/selftests/rseq/rseq.h | 24 ++-
14 files changed, 302 insertions(+), 185 deletions(-)
create mode 100644 tools/testing/selftests/rseq/rseq-generic-thread-pointer.h
create mode 100644 tools/testing/selftests/rseq/rseq-ppc-thread-pointer.h
create mode 100644 tools/testing/selftests/rseq/rseq-thread-pointer.h
create mode 100644 tools/testing/selftests/rseq/rseq-x86-thread-pointer.h
--
2.17.1
