[PATCH 0/4] Restartable Sequences support for glibc 2.30

[Mathieu Desnoyers]

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.

The only point that still appears to not reach concensus is whether it's
acceptable to define the RSEQ_SIG code signature for each architecture.
If I missed other points that failed to reach concensus, please let me
know!

Please consider for inclusion into glibc,

Thanks,

Mathieu


Mathieu Desnoyers (4):
  glibc: Perform rseq(2) registration at C startup and thread creation
    (v7)
  glibc: sched_getcpu(): use rseq cpu_id TLS on Linux
  support record failure: allow use from constructor
  rseq registration tests (v2)

 NEWS                                          |  11 +
 csu/libc-start.c                              |  12 +-
 misc/Makefile                                 |   3 +-
 misc/rseq-internal.h                          |  34 ++
 nptl/pthread_create.c                         |   9 +
 support/check.h                               |   4 +
 support/support_record_failure.c              |  18 +-
 sysdeps/unix/sysv/linux/Makefile              |   8 +-
 sysdeps/unix/sysv/linux/Versions              |   4 +
 sysdeps/unix/sysv/linux/aarch64/bits/rseq.h   |  24 ++
 sysdeps/unix/sysv/linux/aarch64/libc.abilist  |   2 +
 sysdeps/unix/sysv/linux/alpha/libc.abilist    |   2 +
 sysdeps/unix/sysv/linux/arm/bits/rseq.h       |  24 ++
 sysdeps/unix/sysv/linux/arm/libc.abilist      |   2 +
 sysdeps/unix/sysv/linux/bits/rseq.h           |  24 ++
 sysdeps/unix/sysv/linux/hppa/libc.abilist     |   2 +
 sysdeps/unix/sysv/linux/i386/libc.abilist     |   2 +
 sysdeps/unix/sysv/linux/ia64/libc.abilist     |   2 +
 .../sysv/linux/m68k/coldfire/libc.abilist     |   2 +
 .../unix/sysv/linux/m68k/m680x0/libc.abilist  |   2 +
 .../unix/sysv/linux/microblaze/libc.abilist   |   2 +
 sysdeps/unix/sysv/linux/mips/bits/rseq.h      |  24 ++
 .../sysv/linux/mips/mips32/fpu/libc.abilist   |   2 +
 .../sysv/linux/mips/mips32/nofpu/libc.abilist |   2 +
 .../sysv/linux/mips/mips64/n32/libc.abilist   |   2 +
 .../sysv/linux/mips/mips64/n64/libc.abilist   |   2 +
 sysdeps/unix/sysv/linux/nios2/libc.abilist    |   2 +
 sysdeps/unix/sysv/linux/powerpc/bits/rseq.h   |  24 ++
 .../linux/powerpc/powerpc32/fpu/libc.abilist  |   2 +
 .../powerpc/powerpc32/nofpu/libc.abilist      |   2 +
 .../linux/powerpc/powerpc64/be/libc.abilist   |   2 +
 .../linux/powerpc/powerpc64/le/libc.abilist   |   2 +
 .../unix/sysv/linux/riscv/rv64/libc.abilist   |   2 +
 sysdeps/unix/sysv/linux/rseq-internal.h       |  91 +++++
 sysdeps/unix/sysv/linux/rseq-sym.c            |  54 +++
 sysdeps/unix/sysv/linux/s390/bits/rseq.h      |  24 ++
 .../unix/sysv/linux/s390/s390-32/libc.abilist |   2 +
 .../unix/sysv/linux/s390/s390-64/libc.abilist |   2 +
 sysdeps/unix/sysv/linux/sched_getcpu.c        |  25 +-
 sysdeps/unix/sysv/linux/sh/libc.abilist       |   2 +
 .../sysv/linux/sparc/sparc32/libc.abilist     |   2 +
 .../sysv/linux/sparc/sparc64/libc.abilist     |   2 +
 sysdeps/unix/sysv/linux/sys/rseq.h            |  65 +++
 sysdeps/unix/sysv/linux/tst-rseq-nptl.c       | 381 ++++++++++++++++++
 sysdeps/unix/sysv/linux/tst-rseq.c            | 110 +++++
 sysdeps/unix/sysv/linux/x86/bits/rseq.h       |  24 ++
 .../unix/sysv/linux/x86_64/64/libc.abilist    |   2 +
 .../unix/sysv/linux/x86_64/x32/libc.abilist   |   2 +
 48 files changed, 1034 insertions(+), 15 deletions(-)
 create mode 100644 misc/rseq-internal.h
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/bits/rseq.h
 create mode 100644 sysdeps/unix/sysv/linux/arm/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

-- 
2.17.1