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Subject: [Bug libffi/97166] libffi build issue when compiling with
 -mcpu=power10
Date: Thu, 24 Sep 2020 14:01:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97166

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Alan Modra <amodra@gcc.gnu.o=
rg>:

https://gcc.gnu.org/g:71c83e108de7b54f604eeebefbc9e97672310ca7

commit r10-8795-g71c83e108de7b54f604eeebefbc9e97672310ca7
Author: Alan Modra <amodra@gmail.com>
Date:   Fri Sep 18 23:21:05 2020 +0930

    [RS6000] Power10 libffi fixes

    Power10 pc-relative code doesn't use or preserve r2 as a TOC pointer.
    That means calling between pc-relative and TOC using code can't be
    done without intervening linker stubs, and a call from TOC code to
    pc-relative code must have a nop after the bl in order to restore r2.

    Now the PowerPC libffi assembly code doesn't use r2 except for the
    implicit use when making calls back to C, ffi_closure_helper_LINUX64
    and ffi_prep_args64.  So changing the assembly to interoperate with
    pc-relative code without stubs is easily done.

            PR target/97166
            * src/powerpc/linux64.S (ffi_call_LINUX64): Don't emit global
            entry when __PCREL__.  Call using @notoc.  Add nops.
            * src/powerpc/linux64_closure.S (ffi_closure_LINUX64): Likewise.
            (ffi_go_closure_linux64): Likewise.

    (cherry picked from commit 08cd8d5929eac84b27788d8483fd75ab7ad13129)
    (cherry picked from commit fff56af6421a1a3e357bcaad99f2ea084d72a7a8)=