[Bug libc/23125] riscv64: endless loop when throwing an exception from a constructor

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https://sourceware.org/bugzilla/show_bug.cgi?id=23125

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b4ce4476fc5d14fff413abe130b2ea7a7554f8d3

commit b4ce4476fc5d14fff413abe130b2ea7a7554f8d3
Author: Andreas Schwab <schwab@suse.de>
Date:   Tue Sep 25 11:11:27 2018 +0200

    RISC-V: properly terminate call chain (bug 23125)

    Mark the ra register as undefined in _start, so that unwinding through
    main works correctly.  Also, don't use a tail call so that ra points after
    the call to __libc_start_main, not after the previous call.

    (cherry picked from commit 2dd12baa045f25c52b30a34b10f72d51f2605413)

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

Summary of changes:
 ChangeLog                                      |    9 ++++++
 elf/Makefile                                   |    5 +++-
 elf/{tst-absolute-zero.c => tst-unwind-main.c} |   32 ++++++++++++------------
 sysdeps/riscv/start.S                          |    7 ++++-
 4 files changed, 35 insertions(+), 18 deletions(-)
 copy elf/{tst-absolute-zero.c => tst-unwind-main.c} (61%)

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