[v10,0/4] Extend rseq support

  This series rebases the standalone "Add rseq extensible ABI" patch on
current master and addresses many review comments documented in each
patch commit message.

The accelerated getcpu() implementation using the rseq extensible ABI
was split in a different patch series while we figure out the best way
to interface with the librseq project as an upstream.

Cc: Florian Weimer <fweimer@redhat.com>
Cc: Carlos O'Donell <carlos@redhat.com>
Cc: DJ Delorie <dj@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
Changes since v9:
- Rebased on current master
Changes since v8:
- Address review comments
- Split the accelerated getcpu() implementation in a separate patch set
Changes since v7:
- Fix sorting of symbols in abilist files

Michael Jeanson (4):
  nptl: fix potential merge of __rseq_* relro symbols
  Add rseq extensible ABI support
  nptl: Add public __rseq_feature_size symbol
  nptl: Add features to internal 'struct rseq_area'

 csu/Makefile                                  |  2 +-
 csu/libc-tls.c                                | 84 +++++++++++++++++--
 csu/rseq-sizes.sym                            | 11 +++
 elf/Makefile                                  |  1 +
 elf/dl-rseq-symbols.S                         | 72 ++++++++++++++++
 elf/dl-tls.c                                  | 78 +++++++++++++++++
 elf/rtld_static_init.c                        | 12 +++
 manual/threads.texi                           |  9 ++
 nptl/descr.h                                  | 20 +----
 nptl/pthread_create.c                         |  2 +-
 sysdeps/generic/dl-rseq.h                     | 26 ++++++
 sysdeps/generic/ldsodefs.h                    | 12 +++
 sysdeps/i386/nptl/tcb-access.h                | 56 +++++++++++++
 sysdeps/nptl/dl-tls_init_tp.c                 | 22 +++--
 sysdeps/nptl/tcb-access.h                     |  5 ++
 sysdeps/unix/sysv/linux/Makefile              | 10 +++
 sysdeps/unix/sysv/linux/Versions              |  3 +
 sysdeps/unix/sysv/linux/aarch64/ld.abilist    |  1 +
 sysdeps/unix/sysv/linux/alpha/ld.abilist      |  1 +
 sysdeps/unix/sysv/linux/arc/ld.abilist        |  1 +
 sysdeps/unix/sysv/linux/arm/be/ld.abilist     |  1 +
 sysdeps/unix/sysv/linux/arm/le/ld.abilist     |  1 +
 sysdeps/unix/sysv/linux/csky/ld.abilist       |  1 +
 sysdeps/unix/sysv/linux/dl-parse_auxv.h       |  6 ++
 sysdeps/unix/sysv/linux/hppa/ld.abilist       |  1 +
 sysdeps/unix/sysv/linux/i386/ld.abilist       |  1 +
 .../unix/sysv/linux/loongarch/lp64/ld.abilist |  1 +
 .../unix/sysv/linux/m68k/coldfire/ld.abilist  |  1 +
 .../unix/sysv/linux/m68k/m680x0/ld.abilist    |  1 +
 sysdeps/unix/sysv/linux/microblaze/ld.abilist |  1 +
 .../unix/sysv/linux/mips/mips32/ld.abilist    |  1 +
 .../sysv/linux/mips/mips64/n32/ld.abilist     |  1 +
 .../sysv/linux/mips/mips64/n64/ld.abilist     |  1 +
 sysdeps/unix/sysv/linux/nios2/ld.abilist      |  1 +
 sysdeps/unix/sysv/linux/or1k/ld.abilist       |  1 +
 .../sysv/linux/powerpc/powerpc32/ld.abilist   |  1 +
 .../linux/powerpc/powerpc64/be/ld.abilist     |  1 +
 .../linux/powerpc/powerpc64/le/ld.abilist     |  1 +
 sysdeps/unix/sysv/linux/riscv/rv32/ld.abilist |  1 +
 sysdeps/unix/sysv/linux/riscv/rv64/ld.abilist |  1 +
 sysdeps/unix/sysv/linux/rseq-internal.h       | 33 +++++++-
 .../unix/sysv/linux/s390/s390-32/ld.abilist   |  1 +
 .../unix/sysv/linux/s390/s390-64/ld.abilist   |  1 +
 sysdeps/unix/sysv/linux/sched_getcpu.c        |  3 +-
 sysdeps/unix/sysv/linux/sh/be/ld.abilist      |  1 +
 sysdeps/unix/sysv/linux/sh/le/ld.abilist      |  1 +
 .../unix/sysv/linux/sparc/sparc32/ld.abilist  |  1 +
 .../unix/sysv/linux/sparc/sparc64/ld.abilist  |  1 +
 sysdeps/unix/sysv/linux/sys/rseq.h            |  4 +
 .../unix/sysv/linux/tst-rseq-disable-static.c |  1 +
 sysdeps/unix/sysv/linux/tst-rseq-disable.c    | 18 ++--
 .../unix/sysv/linux/tst-rseq-nptl-static.c    |  1 +
 sysdeps/unix/sysv/linux/tst-rseq-static.c     |  1 +
 sysdeps/unix/sysv/linux/tst-rseq.c            | 24 +++++-
 sysdeps/unix/sysv/linux/tst-rseq.h            |  9 +-
 sysdeps/unix/sysv/linux/x86_64/64/ld.abilist  |  1 +
 sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist |  1 +
 sysdeps/x86_64/nptl/tcb-access.h              | 56 +++++++++++++
 58 files changed, 557 insertions(+), 54 deletions(-)
 create mode 100644 csu/rseq-sizes.sym
 create mode 100644 elf/dl-rseq-symbols.S
 create mode 100644 sysdeps/generic/dl-rseq.h
 create mode 100644 sysdeps/unix/sysv/linux/tst-rseq-disable-static.c
 create mode 100644 sysdeps/unix/sysv/linux/tst-rseq-nptl-static.c
 create mode 100644 sysdeps/unix/sysv/linux/tst-rseq-static.c