[Bug gold/25473] [gold] Gold doesn't handle GDesc -> LE transition correctly

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25473

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The master branch has been updated by H.J. Lu <address@hidden>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=6d520e36de0229eefe2f1671438cc8333a90b5e6

commit 6d520e36de0229eefe2f1671438cc8333a90b5e6
Author: H.J. Lu <address@hidden>
Date:   Fri May 1 10:08:31 2020 -0700

    gold: x86-64: Fix TLSDESC -> LE relaxation

    X86-64 TLSDESC sequences can be:

    4c 8d 0d 00 00 00 00    leaq    foo@TLSDESC(%rip), %r9
    4c 89 c8                movq    %r9, %rax
    ff 10                   call    *foo@TLSCALL(%rax)

    TLSDESC -> LE relaxation can turn them into:

    49 c7 c1 fc ff ff ff    mov    $0xfffffffffffffffc,%r9
    4c 89 c8                mov    %r9,%rax
    66 90                   xchg   %ax,%ax

    We need to check and update the REX byte in this case.

            PR gold/25473
            * x86_64.cc (Target_x86_64<size>::Relocate::tls_desc_gd_to_ie):
            Properly check r8 - r15 in "lea foo@TLSDESC(%rip), %reg".
            (Target_x86_64<size>::Relocate::tls_desc_gd_to_le): Properly
            relax r8 - r15 in "lea foo@TLSDESC(%rip), %reg".
            * testsuite/Makefile.am (check_SCRIPTS): Add x86_64_gd_to_le.sh.
            (check_DATA): Add x86_64_gd_to_le.stdout.
            (MOSTLYCLEANFILES): Add x86_64_gd_to_le.
            (x86_64_gd_to_le.o): New target.
            (x86_64_gd_to_le): Likewise.
            (x86_64_gd_to_le.stdout): Likewise.
            * testsuite/Makefile.in: Regenerated.
            * testsuite/x86_64_gd_to_le.s: New file.
            * testsuite/x86_64_gd_to_le.sh: Likewise.

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