[PATCH for 5.2 00/12] Restartable Sequences selftests updates

[Mathieu Desnoyers <mathieu.desnoyers@efficios.com>]

Those rseq selftests updates are hereby submitted to Shuah Khan,
maintainer of kernel selftests, for the next merge window (5.2).

They change the per-architecture pre-abort signatures to ensure those
are valid trap instructions.

The way exit points are presented to debuggers is enhanced, ensuring
all exit points are present, so debuggers don't have to disassemble
rseq critical section to properly skip over them.

Discussions with the glibc community is reaching a concensus of exposing
a __rseq_handled symbol from glibc to coexist with rseq early adopters.
Update the rseq selftest code to expose and use this symbol.

Support for compiling asm goto with clang is added with the
"-no-integrated-as" compiler switch, similarly to the toplevel kernel
Makefile.

Thanks,

Mathieu

Martin Schwidefsky (1):
  rseq/selftests: s390: use trap4 for RSEQ_SIG

Mathieu Desnoyers (11):
  rseq/selftests: x86: Work-around bogus gcc-8 optimisation
  rseq/selftests: Add __rseq_exit_point_array section for debuggers
  rseq/selftests: Introduce __rseq_cs_ptr_array, rename __rseq_table to
    __rseq_cs
  rseq/selftests: Use __rseq_handled symbol to coexist with glibc
  rseq/selftests: s390: use jg instruction for jumps outside of the asm
  rseq/selftests: x86: use ud1 instruction as RSEQ_SIG opcode
  rseq/selftests: arm: use udf instruction for RSEQ_SIG
  rseq/selftests: aarch64 code signature: handle big-endian environment
  rseq/selftests: powerpc code signature: generate valid instructions
  rseq/selftests: mips: use break instruction for RSEQ_SIG
  rseq/selftests: add -no-integrated-as for clang

 tools/testing/selftests/rseq/Makefile     |   8 +-
 tools/testing/selftests/rseq/rseq-arm.h   | 132 +++++++++++++--
 tools/testing/selftests/rseq/rseq-arm64.h |  74 ++++++++-
 tools/testing/selftests/rseq/rseq-mips.h  | 115 +++++++++++--
 tools/testing/selftests/rseq/rseq-ppc.h   |  90 +++++++++-
 tools/testing/selftests/rseq/rseq-s390.h  |  78 ++++++++-
 tools/testing/selftests/rseq/rseq-x86.h   | 264 +++++++++++++++++++++---------
 tools/testing/selftests/rseq/rseq.c       |  55 ++++++-
 tools/testing/selftests/rseq/rseq.h       |   1 +
 9 files changed, 688 insertions(+), 129 deletions(-)

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2.11.0