[0/5] Restartable Sequences support for glibc

Hi,

This patchset implements basic support for the "rseq" Linux system call
in glibc by registering the rseq TLS abi.

One patch in this series modifies sched_getcpu() to speed up reading the
current CPU number by reading __rseq_abi.cpu_id when rseq is available.

It takes into account the last round of feedback that was received.

Please consider for inclusion into glibc,

Thanks,

Mathieu

Mathieu Desnoyers (5):
  glibc: Perform rseq(2) registration at C startup and thread creation
    (v11)
  glibc: sched_getcpu(): use rseq cpu_id TLS on Linux (v5)
  support record failure: allow use from constructor
  support: implement xpthread key create/delete (v2)
  rseq registration tests (v5)

 ChangeLog                                     |  96 +++++
 NEWS                                          |  15 +
 csu/libc-start.c                              |  14 +-
 elf/dl-support.c                              |  22 ++
 elf/rtld.c                                    |  26 ++
 misc/rseq-internal.h                          |  38 ++
 nptl/pthread_create.c                         |   9 +
 support/Makefile                              |   2 +
 support/check.h                               |   4 +
 support/support_record_failure.c              |  18 +-
 support/xpthread_key_create.c                 |  25 ++
 support/xpthread_key_delete.c                 |  24 ++
 support/xthread.h                             |   2 +
 sysdeps/unix/sysv/linux/Makefile              |   8 +-
 sysdeps/unix/sysv/linux/Versions              |  10 +
 sysdeps/unix/sysv/linux/aarch64/bits/rseq.h   |  43 ++
 sysdeps/unix/sysv/linux/aarch64/ld.abilist    |   1 +
 sysdeps/unix/sysv/linux/aarch64/libc.abilist  |   1 +
 sysdeps/unix/sysv/linux/alpha/ld.abilist      |   1 +
 sysdeps/unix/sysv/linux/alpha/libc.abilist    |   1 +
 sysdeps/unix/sysv/linux/arm/ld.abilist        |   1 +
 sysdeps/unix/sysv/linux/arm/libc.abilist      |   1 +
 sysdeps/unix/sysv/linux/bits/rseq.h           |  29 ++
 sysdeps/unix/sysv/linux/csky/ld.abilist       |   1 +
 sysdeps/unix/sysv/linux/csky/libc.abilist     |   1 +
 sysdeps/unix/sysv/linux/hppa/ld.abilist       |   1 +
 sysdeps/unix/sysv/linux/hppa/libc.abilist     |   1 +
 sysdeps/unix/sysv/linux/i386/ld.abilist       |   1 +
 sysdeps/unix/sysv/linux/i386/libc.abilist     |   1 +
 sysdeps/unix/sysv/linux/ia64/ld.abilist       |   1 +
 sysdeps/unix/sysv/linux/ia64/libc.abilist     |   1 +
 .../unix/sysv/linux/m68k/coldfire/ld.abilist  |   1 +
 .../sysv/linux/m68k/coldfire/libc.abilist     |   1 +
 .../unix/sysv/linux/m68k/m680x0/ld.abilist    |   1 +
 .../unix/sysv/linux/m68k/m680x0/libc.abilist  |   1 +
 sysdeps/unix/sysv/linux/microblaze/ld.abilist |   1 +
 .../unix/sysv/linux/microblaze/libc.abilist   |   1 +
 sysdeps/unix/sysv/linux/mips/bits/rseq.h      |  62 +++
 .../sysv/linux/mips/mips32/fpu/libc.abilist   |   1 +
 .../unix/sysv/linux/mips/mips32/ld.abilist    |   1 +
 .../sysv/linux/mips/mips32/nofpu/libc.abilist |   1 +
 .../sysv/linux/mips/mips64/n32/ld.abilist     |   1 +
 .../sysv/linux/mips/mips64/n32/libc.abilist   |   1 +
 .../sysv/linux/mips/mips64/n64/ld.abilist     |   1 +
 .../sysv/linux/mips/mips64/n64/libc.abilist   |   1 +
 sysdeps/unix/sysv/linux/nios2/ld.abilist      |   1 +
 sysdeps/unix/sysv/linux/nios2/libc.abilist    |   1 +
 sysdeps/unix/sysv/linux/powerpc/bits/rseq.h   |  37 ++
 .../linux/powerpc/powerpc32/fpu/libc.abilist  |   1 +
 .../sysv/linux/powerpc/powerpc32/ld.abilist   |   1 +
 .../powerpc/powerpc32/nofpu/libc.abilist      |   1 +
 .../linux/powerpc/powerpc64/be/ld.abilist     |   1 +
 .../linux/powerpc/powerpc64/be/libc.abilist   |   1 +
 .../linux/powerpc/powerpc64/le/ld.abilist     |   1 +
 .../linux/powerpc/powerpc64/le/libc.abilist   |   1 +
 sysdeps/unix/sysv/linux/riscv/rv64/ld.abilist |   1 +
 .../unix/sysv/linux/riscv/rv64/libc.abilist   |   1 +
 sysdeps/unix/sysv/linux/rseq-internal.h       |  88 +++++
 sysdeps/unix/sysv/linux/rseq-sym.c            |  43 ++
 sysdeps/unix/sysv/linux/s390/bits/rseq.h      |  37 ++
 .../unix/sysv/linux/s390/s390-32/ld.abilist   |   1 +
 .../unix/sysv/linux/s390/s390-32/libc.abilist |   1 +
 .../unix/sysv/linux/s390/s390-64/ld.abilist   |   1 +
 .../unix/sysv/linux/s390/s390-64/libc.abilist |   1 +
 sysdeps/unix/sysv/linux/sched_getcpu.c        |  25 +-
 sysdeps/unix/sysv/linux/sh/ld.abilist         |   1 +
 sysdeps/unix/sysv/linux/sh/libc.abilist       |   1 +
 .../unix/sysv/linux/sparc/sparc32/ld.abilist  |   1 +
 .../sysv/linux/sparc/sparc32/libc.abilist     |   1 +
 .../unix/sysv/linux/sparc/sparc64/ld.abilist  |   1 +
 .../sysv/linux/sparc/sparc64/libc.abilist     |   1 +
 sysdeps/unix/sysv/linux/sys/rseq.h            |  52 +++
 sysdeps/unix/sysv/linux/tst-rseq-nptl.c       | 368 ++++++++++++++++++
 sysdeps/unix/sysv/linux/tst-rseq.c            | 122 ++++++
 sysdeps/unix/sysv/linux/x86/bits/rseq.h       |  30 ++
 sysdeps/unix/sysv/linux/x86_64/64/ld.abilist  |   1 +
 .../unix/sysv/linux/x86_64/64/libc.abilist    |   1 +
 sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist |   1 +
 .../unix/sysv/linux/x86_64/x32/libc.abilist   |   1 +
 79 files changed, 1288 insertions(+), 13 deletions(-)
 create mode 100644 misc/rseq-internal.h
 create mode 100644 support/xpthread_key_create.c
 create mode 100644 support/xpthread_key_delete.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/bits/rseq.h
 create mode 100644 sysdeps/unix/sysv/linux/bits/rseq.h
 create mode 100644 sysdeps/unix/sysv/linux/mips/bits/rseq.h
 create mode 100644 sysdeps/unix/sysv/linux/powerpc/bits/rseq.h
 create mode 100644 sysdeps/unix/sysv/linux/rseq-internal.h
 create mode 100644 sysdeps/unix/sysv/linux/rseq-sym.c
 create mode 100644 sysdeps/unix/sysv/linux/s390/bits/rseq.h
 create mode 100644 sysdeps/unix/sysv/linux/sys/rseq.h
 create mode 100644 sysdeps/unix/sysv/linux/tst-rseq-nptl.c
 create mode 100644 sysdeps/unix/sysv/linux/tst-rseq.c
 create mode 100644 sysdeps/unix/sysv/linux/x86/bits/rseq.h