[Bug nptl/22563] __cancel_jmp_buf in __pthread_unwind_buf_t is incompatible with setjmp/longmp

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https://sourceware.org/bugzilla/show_bug.cgi?id=22563

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2036cc2c4c5d3a374bd142adab40aa94042f1d44

commit 2036cc2c4c5d3a374bd142adab40aa94042f1d44
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Dec 6 15:00:46 2017 -0800

    x86: Update __cancel_jmp_buf to match struct __jmp_buf_tag [BZ #22563]

    On x86, padding in struct __jmp_buf_tag is used for shadow stack pointer
    to support Shadow Stack in Intel Control-flow Enforcemen Technology.
    Since the cancel_jmp_buf array is passed to setjmp and longjmp by
    casting it to pointer to struct __jmp_buf_tag, it should be as large
    as struct __jmp_buf_tag.  This patch adds pthread.h and jmpbuf-unwind.h
    for Linux/x86 to match __cancel_jmp_buf with struct __jmp_buf_tag.

    To support the existing binaries, we may have to implement the exported
    setjmp/lonjmp in libc.so as IFUNC functions.

        [BZ #22563]
        * sysdeps/unix/sysv/linux/x86/jmpbuf-unwind.h: New file.
        * sysdeps/unix/sysv/linux/x86/pthread.h: Likewise.

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