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[Bug dynamic-link/15128] dynamic loader may clobber floating-point parameters on AArch64


https://sourceware.org/bugzilla/show_bug.cgi?id=15128

--- Comment #23 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, hjl/plt/master has been created
        at  d53574deb7a0f49da15eca67d01bc188b4f89948 (commit)

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d53574deb7a0f49da15eca67d01bc188b4f89948

commit d53574deb7a0f49da15eca67d01bc188b4f89948
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 29 04:49:38 2015 -0700

    Use SSE optimized strcmp in x86-64 ld.so

    Since ld.so preserves vector registers now, we can SSE optimized strcmp
    in x86-64 ld.so.

        * sysdeps/x86_64/strcmp.S: Remove "#if !IS_IN (libc)".

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3b06f9e926254743bcf61a0971841312c737b2f1

commit 3b06f9e926254743bcf61a0971841312c737b2f1
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 29 03:56:14 2015 -0700

    Remove x86-64 rtld-xxx.c and rtld-xxx.S

    Since ld.so preserves vector registers now, we can use the regular,
    non-ifunc string and memory functions in ld.so.

        * sysdeps/x86_64/rtld-memcmp.c: Removed.
        * sysdeps/x86_64/rtld-memset.S: Likewise.
        * sysdeps/x86_64/rtld-strchr.S: Likewise.
        * sysdeps/x86_64/rtld-strlen.S: Likewise.
        * sysdeps/x86_64/multiarch/rtld-memcmp.c: Likewise.
        * sysdeps/x86_64/multiarch/rtld-memset.S: Likewise.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5100a9262c79946feddb83ad46d8448312d0a792

commit 5100a9262c79946feddb83ad46d8448312d0a792
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 29 03:47:54 2015 -0700

    Replace %xmm8 with %xmm0

    Since ld.so preserves vector registers now, we can use %xmm0 to avoid
    the REX prefix.

        * sysdeps/x86_64/memset.S: Replace %xmm8 with %xmm0.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=200eb0e798153aa644e6a6c551c685a25f1f0d1f

commit 200eb0e798153aa644e6a6c551c685a25f1f0d1f
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 29 03:44:39 2015 -0700

    Replace %xmm[8-12] with %xmm[0-4]

    Since ld.so preserves vector registers now, we can use %xmm[0-4] to
    avoid the REX prefix.

        * sysdeps/x86_64/strlen.S: Replace %xmm[8-12] with %xmm[0-4].

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6642aacc2b3f2779448f9878b9a320dd9bd184ab

commit 6642aacc2b3f2779448f9878b9a320dd9bd184ab
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 28 18:56:18 2015 -0700

    Don't disable SSE in x86-64 ld.so

    Since ld.so preserves vector registers now, we can use SSE in ld.so.

        * sysdeps/i386/Makefile [$(subdir) == elf] (CFLAGS-.os): Add
        -mno-sse -mno-mmx for $(all-rtld-routines).
        [$(subdir) == elf] (tests-special): Add
        $(objpfx)tst-ld-sse-use.out.
        [$(subdir) == elf] ($(objpfx)tst-ld-sse-use.out): New rule.
        * sysdeps/x86/Makefile [$(subdir) == elf] (CFLAGS-.os): Removed.
        [$(subdir) == elf] (tests-special): Likewise.
        [$(subdir) == elf] ($(objpfx)tst-ld-sse-use.out): Likewise.
        * sysdeps/x86_64/Makefile [$(subdir) == elf] (CFLAGS-.os): Add
        -mno-mmx for $(all-rtld-routines).

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f95bec159176aef22fb9465793b8fa5d354bea31

commit f95bec159176aef22fb9465793b8fa5d354bea31
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sat Jul 11 13:25:25 2015 -0700

    Save and restore vector registers in x86-64 ld.so

    This patch initiaizes GLRO(dl_x86_xstate) in dl_platform_init to
    indicate if the processor supports SSE, AVX or AVX512.  It uses
    this information to properly save and restore vector registers in
    ld.so.  Now we can use SSE in ld.so and delete FOREIGN_CALL macros.

        [BZ #15128]
        * sysdeps/x86_64/Makefile [$(subdir) == elf] (tests): Add
        ifuncmain8.
        (modules-names): Add ifuncmod8.
        ($(objpfx)ifuncmain8): New rule.
        * sysdeps/x86_64/dl-machine.h: Include <dl-procinfo.h> and
        <cpuid.h>.
        (elf_machine_runtime_setup): Use _dl_runtime_resolve_sse,
        _dl_runtime_resolve_avx, or _dl_runtime_resolve_avx512,
        _dl_runtime_profile_sse, _dl_runtime_profile_avx, or
        _dl_runtime_profile_avx512, based on HAS_ARCH_FEATURE.
        * sysdeps/x86_64/dl-trampoline.S: Rewrite.
        * sysdeps/x86_64/dl-trampoline.h: Likewise.
        * sysdeps/x86_64/ifuncmain8.c: New file.
        * sysdeps/x86_64/ifuncmod8.c: Likewise.
        * sysdeps/x86_64/nptl/tcb-offsets.sym (RTLD_SAVESPACE_SSE):
        Removed.
        * sysdeps/x86_64/nptl/tls.h (__128bits): Removed.
        (tcbhead_t): Change rtld_must_xmm_save to __glibc_unused1.
        Change rtld_savespace_sse to __glibc_unused2.
        (RTLD_CHECK_FOREIGN_CALL): Removed.
        (RTLD_ENABLE_FOREIGN_CALL): Likewise.
        (RTLD_PREPARE_FOREIGN_CALL): Likewise.
        (RTLD_FINALIZE_FOREIGN_CALL): Likewise.

    Fix tcbhead_t

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a018fe7a7229c3048dcd5765716b719905820f64

commit a018fe7a7229c3048dcd5765716b719905820f64
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Jul 12 14:41:20 2015 -0700

    Align stack when calling __errno_location

    We should align stack to 16 bytes when calling __errno_location.

        [BZ #18661]
        * sysdeps/x86_64/fpu/s_cosf.S (__cosf): Align stack to 16 bytes
        when calling __errno_location.
        * sysdeps/x86_64/fpu/s_sincosf.S (__sincosf): Likewise.
        * sysdeps/x86_64/fpu/s_sinf.S (__sinf): Likewise.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=dececeb4701899392f987a0d9eb92fe8fd0e9e32

commit dececeb4701899392f987a0d9eb92fe8fd0e9e32
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Jul 12 14:40:25 2015 -0700

    Align stack to 16 bytes when calling __gettimeofday

    Subtract stack by 24 bytes instead of 16 bytes so that stack is aligned
    to 16 bytes when calling __gettimeofday.

        [BZ #18661]
        * sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
        (__lll_timedwait_tid): Align stack to 16 bytes when calling
        __gettimeofday.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=18a1650a345418cc2a4c83372cb4402d0da4535d

commit 18a1650a345418cc2a4c83372cb4402d0da4535d
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Jul 12 14:38:58 2015 -0700

    Align stack to 16 bytes when calling __setcontext

    Don't use pop to restore %rdi so that stack is aligned to 16 bytes
    when calling __setcontext.

        [BZ #18661]
        * sysdeps/unix/sysv/linux/x86_64/__start_context.S
        (__start_context): Don't use pop to restore %rdi so that stack
        is aligned to 16 bytes when calling __setcontext.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1c1d5084bb4de396487418ca2fd96538e489100e

commit 1c1d5084bb4de396487418ca2fd96538e489100e
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 29 03:41:58 2015 -0700

    Compile {memcpy,strcmp}-sse2-unaligned.S only for libc

    {memcpy,strcmp}-sse2-unaligned.S aren't needed in ld.so.

        * sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S: Compile
        only for libc.
        * sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S: Likewise.

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