[Bug libc/14890] Make NT_PRFPREG canonical.

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https://sourceware.org/bugzilla/show_bug.cgi?id=14890

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d28bf648976eb2e6d0bcc64a53f4ed1ebb59a40e

commit d28bf648976eb2e6d0bcc64a53f4ed1ebb59a40e
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Feb 6 00:37:17 2018 +0000

    Add elf.h NT_* macros from Linux 4.15 (bug 14890).

    Linux 4.15 adds NT_S390_RI_CB to linux/elf.h (and NT_ARM_SVE, which we
    already have in glibc).  This shows up that various other ELF note
    values from linux/elf.h are missing from glibc's elf.h.

    This patch adds the missing values that are relevant to glibc
    architectures.  As elf.h is a general description of the ELF format,
    not necessarily limited to glibc configurations, there's an argument
    for having the remaining NT_* values that Linux uses for non-glibc
    architectures in glibc's elf.h as well, but this patch does not add
    them.

    Adding the NT_PRFPREG name is bug 14890.  That bug also requests
    making the NT_FPREGSET name obsolete.  Given that elf.h is not just
    for Linux but can describe ELF for other operating systems, I don't
    think that a change of name in the Linux kernel is sufficient
    justification for declaring the other name obsolete; there can be
    multiple names for the same note value, even with incompatible
    semantics, if those reflect variants of the ELF format in actual use.
    For example, FreeBSD appears still to have the name NT_FPREGSET
    <https://github.com/freebsd/freebsd/blob/master/sys/sys/elf_common.h>
    (note: I haven't checked whether the FreeBSD kernel actually generates
    such notes or whether this is actually an other-OS definition present
    in FreeBSD's header).

        [BZ #14890]
        * elf/elf.h (NT_PRFPREG): New macro.
        (NT_S390_VXRS_LOW): Likewise.
        (NT_S390_VXRS_HIGH): Likewise.
        (NT_S390_GS_CB): Likewise.
        (NT_S390_GS_BC): Likewise.
        (NT_S390_RI_CB): Likewise.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog |    8 ++++++++
 elf/elf.h |    9 +++++++++
 2 files changed, 17 insertions(+), 0 deletions(-)

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