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[Bug dynamic-link/18134] x86 ld.so doesn't preserve bound registers


https://sourceware.org/bugzilla/show_bug.cgi?id=18134

--- Comment #10 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, hjl/plt/2.21 has been created
        at  22ce18019f83b1f9826c32aa2ee56dc0df3fbd49 (commit)

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=22ce18019f83b1f9826c32aa2ee56dc0df3fbd49

commit 22ce18019f83b1f9826c32aa2ee56dc0df3fbd49
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Aug 2 22:27:47 2015 -0700

    Don't run tst-getpid2 with LD_BIND_NOW=1

    Since _dl_x86_64_save_sse and _dl_x86_64_restore_sse are removed now,
    we don't need to run tst-getpid2 with LD_BIND_NOW=1.

        * nptl/Makefile (tst-getpid2-ENV): Removed.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f0f347fa1c5ac0bb367f1ad85fe69fbdc1d7df41

commit f0f347fa1c5ac0bb367f1ad85fe69fbdc1d7df41
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=969ca0cbde44e2c531f4fb4358da354e45a16895

commit 969ca0cbde44e2c531f4fb4358da354e45a16895
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=c245d87cf4754a8553b5284206da1d15f1fbb7dc

commit c245d87cf4754a8553b5284206da1d15f1fbb7dc
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=1cb03e05847b1e8e68a06473f0fedf79ecf49005

commit 1cb03e05847b1e8e68a06473f0fedf79ecf49005
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=0b92f51d8303a5148aa99dc101d1e73244199a61

commit 0b92f51d8303a5148aa99dc101d1e73244199a61
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=00c7c14c2131849983307800f5917c32b58d29d9

commit 00c7c14c2131849983307800f5917c32b58d29d9
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.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b4bf7d64c8f7597cc03abd608b50064f7cca4f40

commit b4bf7d64c8f7597cc03abd608b50064f7cca4f40
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=1c8f0fb6a4ebef1080e254753e6a4e6c07a66a4f

commit 1c8f0fb6a4ebef1080e254753e6a4e6c07a66a4f
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=08094d48c130d3ae6182296ef3c9561ca1066b39

commit 08094d48c130d3ae6182296ef3c9561ca1066b39
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=723a5bd465082390bd9369d4f95ec11b32cf47dd

commit 723a5bd465082390bd9369d4f95ec11b32cf47dd
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.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3d497ce3d1ab11a363c543b42737a0696329ed40

commit 3d497ce3d1ab11a363c543b42737a0696329ed40
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sat Aug 1 07:47:16 2015 -0700

    Update x86 elision-conf.c for <cpu-features.h>

    This patch updates x86 elision-conf.c to use the newly defined
    HAS_CPU_FEATURE from <cpu-features.h>.

        * sysdeps/unix/sysv/linux/x86/elision-conf.c (elision_init):
        Replace HAS_RTM with HAS_CPU_FEATURE (RTM).

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3dbbb788b8b59f0c88ac8eeae341f491dd739949

commit 3dbbb788b8b59f0c88ac8eeae341f491dd739949
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Jul 31 16:52:19 2015 -0700

    Update i686 multiarch functions for <cpu-features.h>

    This patch updates i686 multiarch functions to use the newly defined
    HAS_CPU_FEATURE, HAS_ARCH_FEATURE, LOAD_GOT_AND_RTLD_GLOBAL_RO and
    LOAD_FUNC_GOT_EAX from <cpu-features.h>.

        * sysdeps/i386/i686/fpu/multiarch/e_expf.c: Replace HAS_XXX
        with HAS_CPU_FEATURE/HAS_ARCH_FEATURE (XXX).
        * sysdeps/i386/i686/fpu/multiarch/s_cosf.c: Likewise.
        * sysdeps/i386/i686/fpu/multiarch/s_cosf.c: Likewise.
        * sysdeps/i386/i686/fpu/multiarch/s_sincosf.c: Likewise.
        * sysdeps/i386/i686/fpu/multiarch/s_sinf.c: Likewise.
        * sysdeps/i386/i686/multiarch/ifunc-impl-list.c: Likewise.
        * sysdeps/i386/i686/multiarch/s_fma.c: Likewise.
        * sysdeps/i386/i686/multiarch/s_fmaf.c: Likewise.
        * sysdeps/i386/i686/multiarch/bcopy.S: Remove __init_cpu_features
        call.  Merge SHARED and !SHARED.  Add LOAD_GOT_AND_RTLD_GLOBAL_RO.
        Use LOAD_FUNC_GOT_EAX to load function address.  Replace HAS_XXX
        with HAS_CPU_FEATURE/HAS_ARCH_FEATURE (XXX).
        * sysdeps/i386/i686/multiarch/bzero.S: Likewise.
        * sysdeps/i386/i686/multiarch/memchr.S: Likewise.
        * sysdeps/i386/i686/multiarch/memcmp.S: Likewise.
        * sysdeps/i386/i686/multiarch/memcpy.S: Likewise.
        * sysdeps/i386/i686/multiarch/memcpy_chk.S: Likewise.
        * sysdeps/i386/i686/multiarch/memmove.S: Likewise.
        * sysdeps/i386/i686/multiarch/memmove_chk.S: Likewise.
        * sysdeps/i386/i686/multiarch/mempcpy.S: Likewise.
        * sysdeps/i386/i686/multiarch/mempcpy_chk.S: Likewise.
        * sysdeps/i386/i686/multiarch/memrchr.S: Likewise.
        * sysdeps/i386/i686/multiarch/memset.S: Likewise.
        * sysdeps/i386/i686/multiarch/memset_chk.S: Likewise.
        * sysdeps/i386/i686/multiarch/rawmemchr.S: Likewise.
        * sysdeps/i386/i686/multiarch/strcasecmp.S: Likewise.
        * sysdeps/i386/i686/multiarch/strcat.S: Likewise.
        * sysdeps/i386/i686/multiarch/strchr.S: Likewise.
        * sysdeps/i386/i686/multiarch/strcmp.S: Likewise.
        * sysdeps/i386/i686/multiarch/strcpy.S: Likewise.
        * sysdeps/i386/i686/multiarch/strcspn.S: Likewise.
        * sysdeps/i386/i686/multiarch/strlen.S: Likewise.
        * sysdeps/i386/i686/multiarch/strncase.S: Likewise.
        * sysdeps/i386/i686/multiarch/strnlen.S: Likewise.
        * sysdeps/i386/i686/multiarch/strrchr.S: Likewise.
        * sysdeps/i386/i686/multiarch/strspn.S: Likewise.
        * sysdeps/i386/i686/multiarch/wcschr.S: Likewise.
        * sysdeps/i386/i686/multiarch/wcscmp.S: Likewise.
        * sysdeps/i386/i686/multiarch/wcscpy.S: Likewise.
        * sysdeps/i386/i686/multiarch/wcslen.S: Likewise.
        * sysdeps/i386/i686/multiarch/wcsrchr.S: Likewise.
        * sysdeps/i386/i686/multiarch/wmemcmp.S: Likewise.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0fb36bf746cd24c110898a39881c88a7398e4e59

commit 0fb36bf746cd24c110898a39881c88a7398e4e59
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Jul 31 13:41:04 2015 -0700

    Update x86_64 multiarch functions for <cpu-features.h>

    This patch updates x86_64 multiarch functions to use the newly defined
    HAS_CPU_FEATURE, HAS_ARCH_FEATURE and LOAD_RTLD_GLOBAL_RO_RDX from
    <cpu-features.h>.

        * sysdeps/x86_64/fpu/multiarch/e_asin.c: Replace HAS_XXX with
        HAS_CPU_FEATURE/HAS_ARCH_FEATURE (XXX).
        * sysdeps/x86_64/fpu/multiarch/e_atan2.c: Likewise.
        * sysdeps/x86_64/fpu/multiarch/e_exp.c: Likewise.
        * sysdeps/x86_64/fpu/multiarch/e_log.c: Likewise.
        * sysdeps/x86_64/fpu/multiarch/e_pow.c: Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_atan.c: Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_fma.c: Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_fmaf.c: Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_sin.c: Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_tan.c: Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_ceil.S: Use
        LOAD_RTLD_GLOBAL_RO_RDX and HAS_CPU_FEATURE (SSE4_1).
        * sysdeps/x86_64/fpu/multiarch/s_ceilf.S: Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_floor.S: Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_floorf.S: Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_nearbyint.S : Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_nearbyintf.S: Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_rintf.S: Likewise.
        * sysdeps/x86_64/fpu/multiarch/s_rintf.S : Likewise.
        * sysdeps/x86_64/multiarch/ifunc-impl-list.c: Likewise.
        * sysdeps/x86_64/multiarch/sched_cpucount.c: Likewise.
        * sysdeps/x86_64/multiarch/strstr.c: Likewise.
        * sysdeps/x86_64/multiarch/memmove.c: Likewise.
        * sysdeps/x86_64/multiarch/memmove_chk.c: Likewise.
        * sysdeps/x86_64/multiarch/test-multiarch.c: Likewise.
        * sysdeps/x86_64/multiarch/memcmp.S: Remove __init_cpu_features
        call.  Add LOAD_RTLD_GLOBAL_RO_RDX.  Replace HAS_XXX with
        HAS_CPU_FEATURE/HAS_ARCH_FEATURE (XXX).
        * sysdeps/x86_64/multiarch/memcpy.S: Likewise.
        * sysdeps/x86_64/multiarch/memcpy_chk.S: Likewise.
        * sysdeps/x86_64/multiarch/mempcpy.S: Likewise.
        * sysdeps/x86_64/multiarch/mempcpy_chk.S: Likewise.
        * sysdeps/x86_64/multiarch/memset.S: Likewise.
        * sysdeps/x86_64/multiarch/memset_chk.S: Likewise.
        * sysdeps/x86_64/multiarch/strcat.S: Likewise.
        * sysdeps/x86_64/multiarch/strchr.S: Likewise.
        * sysdeps/x86_64/multiarch/strcmp.S: Likewise.
        * sysdeps/x86_64/multiarch/strcpy.S: Likewise.
        * sysdeps/x86_64/multiarch/strcspn.S: Likewise.
        * sysdeps/x86_64/multiarch/strspn.S: Likewise.
        * sysdeps/x86_64/multiarch/wcscpy.S: Likewise.
        * sysdeps/x86_64/multiarch/wmemcmp.S: Likewise.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=14fda2e2ef67727228e3b7e2dea174cac4ffd19d

commit 14fda2e2ef67727228e3b7e2dea174cac4ffd19d
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Jul 31 07:30:04 2015 -0700

    Add _dl_x86_cpu_features to rtld_global in ld.so

    This patch adds _dl_x86_cpu_features to rtld_global in x86 ld.so
    and initializes it early before __libc_start_main is called so that
    cpu_features is always available when it is used and we can avoid
    calling __init_cpu_features in IFUNC selectors.

        * sysdeps/i386/dl-machine.h: Include <cpu-features.c>.
        (dl_platform_init): Call init_cpu_features.
        * sysdeps/i386/dl-procinfo.c (_dl_x86_cpu_features): New.
        * sysdeps/i386/i686/cacheinfo.c
        (DISABLE_PREFERRED_MEMORY_INSTRUCTION): Removed.
        * sysdeps/i386/i686/multiarch/Makefile (aux): Remove init-arch.
        * sysdeps/i386/i686/multiarch/Versions: Removed.
        * sysdeps/i386/i686/multiarch/ifunc-defines.sym (KIND_OFFSET):
        Removed.
        * sysdeps/i386/ldsodefs.h: Include <cpu-features.h>.
        * sysdeps/unix/sysv/linux/x86/Makefile
        (libpthread-sysdep_routines): Remove init-arch.
        * sysdeps/unix/sysv/linux/x86_64/dl-procinfo.c: Include
        <sysdeps/x86_64/dl-procinfo.c> instead of
        sysdeps/generic/dl-procinfo.c>.
        * sysdeps/x86/Makefile [$(subdir) == csu] (gen-as-const-headers):
        Add cpu-features-offsets.sym and rtld-global-offsets.sym.
        [$(subdir) == elf] (sysdep-dl-routines): Add dl-get-cpu-features.
        [$(subdir) == elf] (sysdep-rtld-routines): Likewise.
        [$(subdir) == elf] (sysdep_routines): Likewise.
        [$(subdir) == elf] (elide-routines.os): Likewise.
        [$(subdir) == elf] (tests): Add tst-get-cpu-features.
        [$(subdir) == elf] (tests-static): Add
        tst-get-cpu-features-static.
        * sysdeps/x86/Versions: New file.
        * sysdeps/x86/cpu-features-offsets.sym: Likewise.
        * sysdeps/x86/cpu-features.c: Likewise.
        * sysdeps/x86/cpu-features.h: Likewise.
        * sysdeps/x86/dl-get-cpu-features.c: Likewise.
        * sysdeps/x86/libc-start.c: Likewise.
        * sysdeps/x86/rtld-global-offsets.sym: Likewise.
        * sysdeps/x86/tst-get-cpu-features-static.c: Likewise.
        * sysdeps/x86/tst-get-cpu-features.c: Likewise.
        * sysdeps/x86_64/dl-procinfo.c: Likewise.
        * sysdeps/x86_64/cacheinfo.c (__cpuid_count): Removed.
        Assume USE_MULTIARCH is defined and don't check it.
        (is_intel): Replace __cpu_features with GLRO(dl_x86_cpu_features).
        (is_amd): Likewise.
        (max_cpuid): Likewise.
        (intel_check_word): Likewise.
        (__cache_sysconf): Don't call __init_cpu_features.
        (__x86_preferred_memory_instruction): Removed.
        (init_cacheinfo): Don't call __init_cpu_features. Replace
        __cpu_features with GLRO(dl_x86_cpu_features).
        * sysdeps/x86_64/dl-machine.h: <cpu-features.c>.
        (dl_platform_init): Call init_cpu_features.
        * sysdeps/x86_64/ldsodefs.h: Include <cpu-features.h>.
        * sysdeps/x86_64/multiarch/Makefile (aux): Remove init-arch.
        * sysdeps/x86_64/multiarch/Versions: Removed.
        * sysdeps/x86_64/multiarch/cacheinfo.c: Likewise.
        * sysdeps/x86_64/multiarch/init-arch.c: Likewise.
        * sysdeps/x86_64/multiarch/ifunc-defines.sym (KIND_OFFSET):
        Removed.
        * sysdeps/x86_64/multiarch/init-arch.h: Rewrite.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=fdd3aa0b19700ab564da895a2a85bf3fdb0bedf0

commit fdd3aa0b19700ab564da895a2a85bf3fdb0bedf0
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Jul 9 09:30:09 2015 -0700

    Improve bndmov encoding with zero displacement

    If x86-64 assembler doesn't support MPX, we encode bndmov instruction by
    hand.  When displacement is zero, assembler generates shorter encoding.
    This patch improves bndmov encoding with zero displacement so that ld.so
    is identical when using assemblers with and without MPX support.

        * sysdeps/x86_64/dl-trampoline.S (_dl_runtime_resolve): Improve
        bndmov encoding with zero displacement.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9e4fc7f67f6695f294ae759a6b540f5d08a56f0c

commit 9e4fc7f67f6695f294ae759a6b540f5d08a56f0c
Author: Igor Zamyatin <igor.zamyatin@intel.com>
Date:   Thu Jul 9 06:50:12 2015 -0700

    Preserve bound registers for pointer pass/return

    We need to save/restore bound registers and add a BND prefix before
    branches in _dl_runtime_profile so that bound registers for pointer
    pass and return are preserved when LD_AUDIT is used.

        [BZ #18134]
        * sysdeps/i386/configure.ac: Set HAVE_MPX_SUPPORT.
        * sysdeps/i386/configure: Regenerated.
        * sysdeps/i386/dl-trampoline.S (PRESERVE_BND_REGS_PREFIX): New.
        (_dl_runtime_profile): Save and restore Intel MPX return bound
        registers when calling _dl_call_pltexit.  Add
        PRESERVE_BND_REGS_PREFIX before return.
        * sysdeps/i386/link-defines.sym (LRV_BND0_OFFSET): New.
        (LRV_BND1_OFFSET): Likewise.
        * sysdeps/x86/bits/link.h (La_i86_retval): Add lrv_bnd0 and
        lrv_bnd1.
        * sysdeps/x86_64/dl-trampoline.S (_dl_runtime_profile): Fix
        typo in bndmov encoding.
        * sysdeps/x86_64/dl-trampoline.h: Properly save and restore
        Intel MPX bound registers.  Add PRESERVE_BND_REGS_PREFIX before
        branch instructions to preserve bounds.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b15f277bac14482c8b2dda4931ebf919644932fa

commit b15f277bac14482c8b2dda4931ebf919644932fa
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Mar 16 14:58:43 2015 -0700

    Preserve bound registers in _dl_runtime_resolve

    We need to add a BND prefix before indirect branch at the end of
    _dl_runtime_resolve to preserve bound registers.

        [BZ #18134]
        * sysdeps/x86_64/dl-trampoline.S (PRESERVE_BND_REGS_PREFIX): New.
        (_dl_runtime_resolve): Add a BND prefix before indirect branch.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=20f87a053b1e6a9106851f764c205d59fd4b6879

commit 20f87a053b1e6a9106851f764c205d59fd4b6879
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 7 05:23:24 2015 -0700

    Add and use sysdeps/i386/link-defines.sym

    Define macros for fields in La_i86_regs and La_i86_retval and use them
    in dl-trampoline.S, instead of hardcoded values.

        * sysdeps/i386/Makefile (gen-as-const-headers)[elf]: Add
        link-defines.sym.
        * sysdeps/i386/dl-trampoline.S: Include <link-defines.h>.
        (_dl_runtime_profile): Use LONG_DOUBLE_SIZE, LRV_SIZE,
        LRV_EAX_OFFSET, LRV_EDX_OFFSET, LRV_ST0_OFFSET, LRV_ST1_OFFSET
        and LR_SIZE.
        * sysdeps/i386/link-defines.sym: New file.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d6fd297566e2389ab855325754bcb25f604c6b7d

commit d6fd297566e2389ab855325754bcb25f604c6b7d
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 7 05:09:16 2015 -0700

    Add a testcase for i386 LD_AUDIT

    This patch adds a testcase for i386 LD_AUDIT to check function return
    and parameters passed in registers.

        * sysdeps/i386/Makefile (tests)[elf]: Add tst-audit3.
        (modules-names): Add tst-auditmod3a tst-auditmod3b.
        ($(objpfx)tst-audit3): New rule.
        ($(objpfx)tst-audit3.out): Likewise.
        * sysdeps/i386/tst-audit3.c: New file.
        * sysdeps/i386/tst-audit3.h: Likewise.
        * sysdeps/i386/tst-auditmod3a.c: Likewise.
        * sysdeps/i386/tst-auditmod3b.c: Likewise.

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