[Bug ld/26656] power10 libstdc++.so segfault in __cxxabiv1::__cxa_throw

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26656

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The binutils-2_35-branch branch has been updated by Alan Modra
<amodra@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=6f9a6c28850f6839ff61af22c277b2abbf7895da

commit 6f9a6c28850f6839ff61af22c277b2abbf7895da
Author: Alan Modra <amodra@gmail.com>
Date:   Tue Sep 22 22:51:42 2020 +0930

    PR26656, power10 libstdc++.so segfault in __cxxabiv1::__cxa_throw

    This adds missing support for a power10 version of the __tls_get_addr
    call stub implementing DT_PPC64_OPT PPC64_OPT_TLS.  Without this,
    power10 code using __tls_get_addr fails miserably at runtime unless
    the --no-tls-get-addr-optimize option is given.

            PR 26656
            * elf64-ppc.c (plt_stub_size): Add "odd" param.  Use it with
            size_power10_offset rather than calculating from start of stub.
            Add size for notoc tls_get_addr_opt stub.
            (plt_stub_pad): Add "odd" param, pass to plt_stub_size.
            (build_tls_get_addr_head, build_tls_get_addr_tail): New functions.
            (build_tls_get_addr_stub): Delete.
            (ppc_build_one_stub): Use a temp for htab->params->stub_bfd.
            Emit notoc tls_get_addr_opt stub.  Move eh_frame code to
            suit.  Adjust code to use bfd_tls_get_addr_head/tail in place
            of build_tls_get_addr_stub.
            (ppc_size_one_stub): Size notoc tls_get_addr_opt stub.
            Adjust plt_stub_size and plt_stub_pad calls.  Correct "odd"
            when padding stub.  Size eh_frame for notoc stub too.
            Correct lr_restore value.
            (ppc64_elf_relocate_section): Don't skip over first insn of
            notoc tls_get_addr_opt stub.

    (cherry picked from commit 294338867c268b6da43327b6cbe70e746bff1a04)

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