[PATCH v2 0/1] x86-64: Update _dl_tlsdesc_dynamic to preserve AMX registers

[H.J. Lu]

Changes in v2:

1. Unroll the first loop in init_tile_config in AMX test.

---
_dl_tlsdesc_dynamic should also preserve AMX registers which are
caller-saved.  Add X86_XSTATE_TILECFG_ID and X86_XSTATE_TILEDATA_ID
to x86-64 TLSDESC_CALL_STATE_SAVE_MASK.  Compute the AMX state size
and save it in xsave_state_full_size which is only used by
_dl_tlsdesc_dynamic_xsave and _dl_tlsdesc_dynamic_xsavec.  This fixes
the AMX part of BZ #31372.  Tested on AMX processor.

AMX test is enabled only for compilers with the fix for

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114098

GCC 14 and GCC 11/12/13 branches have the bug fix.

---
H.J. Lu (1):
  x86-64: Update _dl_tlsdesc_dynamic to preserve AMX registers

 sysdeps/unix/sysv/linux/x86_64/Makefile       | 27 ++++++
 .../sysv/linux/x86_64/include/asm/prctl.h     |  5 ++
 .../linux/x86_64/tst-gnu2-tls2-amx-mod0.c     |  2 +
 .../linux/x86_64/tst-gnu2-tls2-amx-mod1.c     |  2 +
 .../linux/x86_64/tst-gnu2-tls2-amx-mod2.c     |  2 +
 .../sysv/linux/x86_64/tst-gnu2-tls2-amx.c     | 83 +++++++++++++++++++
 .../sysv/linux/x86_64/tst-gnu2-tls2-amx.h     | 63 ++++++++++++++
 sysdeps/x86/cpu-features-offsets.sym          |  1 +
 sysdeps/x86/cpu-features.c                    | 55 +++++++++++-
 sysdeps/x86/include/cpu-features.h            |  2 +
 sysdeps/x86/sysdep.h                          | 18 +++-
 sysdeps/x86_64/configure                      | 28 +++++++
 sysdeps/x86_64/configure.ac                   | 15 ++++
 sysdeps/x86_64/dl-tlsdesc-dynamic.h           |  2 +-
 14 files changed, 299 insertions(+), 6 deletions(-)
 create mode 100644 sysdeps/unix/sysv/linux/x86_64/tst-gnu2-tls2-amx-mod0.c
 create mode 100644 sysdeps/unix/sysv/linux/x86_64/tst-gnu2-tls2-amx-mod1.c
 create mode 100644 sysdeps/unix/sysv/linux/x86_64/tst-gnu2-tls2-amx-mod2.c
 create mode 100644 sysdeps/unix/sysv/linux/x86_64/tst-gnu2-tls2-amx.c
 create mode 100644 sysdeps/unix/sysv/linux/x86_64/tst-gnu2-tls2-amx.h

-- 
2.43.2