[Bug libc/19792] MIPS: backtrace yields infinite backtrace with makecontext

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https://sourceware.org/bugzilla/show_bug.cgi?id=19792

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=63ed4db4b45cab21cf6f68aac7b9fce2f770fe74

commit 63ed4db4b45cab21cf6f68aac7b9fce2f770fe74
Author: Aurelien Jarno <aurelien@aurel32.net>
Date:   Wed Mar 9 00:25:00 2016 +0100

    mips: terminate the FDE before the return trampoline in makecontext

    In makecontext the FDE needs to be terminated before the return
    trampoline otherwise backtrace called within a context created by
    makecontext yields infinite backtrace.

    This bug has been present for a long time, stdlib/tst-makecontext did
    not fail until recent commit e535ce25. Tested on mips-linux-gnu and
    mips64el-linux-gnuabi64 and mips-linux-gnu, no regression.

    This fixes stdlib/tst-makecontext on MIPS.

    Changelog:
        [BZ #19792]
        * sysdeps/unix/sysv/linux/mips/makecontext.S (__makecontext):
        Terminate FDE before return label.

    (cherry picked from commit f8e9c4d30c28b8815e65a391416e8b15d2e7cbb8)

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

Summary of changes:
 ChangeLog                                  |    6 ++++++
 NEWS                                       |    1 +
 sysdeps/unix/sysv/linux/mips/makecontext.S |    7 +++++++
 3 files changed, 14 insertions(+), 0 deletions(-)

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