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Avoid tickling a linker bug from microblaze pt-vfork.S.
libpthread used to have its own vfork implementation that differed from libc's only in having a pointless micro-optimization. There is no longer any use to having a separate copy in libpthread, but the historical ABI requires a compatibility shim. microblaze was trying to be slightly too clever about how it did this, and tickled a linker bug. The linker bug should get fixed eventually, but there's no reason for us to keep tickling it in the meantime. This doesn't reuse the generic pt-vfork.c because microblaze doesn't have IFUNC support yet, and it doesn't reuse aarch64/pt-vfork.c because that fails to generate a tailcall (with GCC 7.1.1). * sysdeps/unix/sysv/linux/microblaze/pt-vfork.S: Don't include alpha/pt-vfork.S. Provide own compat shim for vfork and __vfork. * sysdeps/unix/sysv/linux/microblaze/vfork.S: Add __libc_vfork alias. * sysdeps/unix/sysv/linux/microblaze/localplt.data: libpthread.so no longer references __errno_location.
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@ -1,3 +1,11 @@
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2017-06-01 Zack Weinberg <zackw@panix.com>
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* sysdeps/unix/sysv/linux/microblaze/pt-vfork.S: Don't include
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alpha/pt-vfork.S. Provide own compat shim for vfork and __vfork.
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* sysdeps/unix/sysv/linux/microblaze/vfork.S: Add __libc_vfork alias.
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* sysdeps/unix/sysv/linux/microblaze/localplt.data:
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libpthread.so no longer references __errno_location.
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2017-05-31 Adhemerval Zanella <adhemerval.zanella@linaro.org>
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* NEWS: Add note about pwritev2 and preadv2 inclusion.
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@ -5,7 +5,6 @@ libc.so: malloc
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libc.so: memalign
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libc.so: realloc
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libm.so: matherr
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libpthread.so: __errno_location
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# The dynamic loader needs __tls_get_addr for TLS.
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ld.so: __tls_get_addr ?
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# The main malloc is interposed into the dynamic linker, for
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@ -1 +1,49 @@
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#include <sysdeps/unix/sysv/linux/alpha/pt-vfork.S>
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/* vfork ABI-compatibility entry points for libpthread.
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Copyright (C) 2014-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <shlib-compat.h>
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/* libpthread used to have its own vfork implementation that differed
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from libc's only in having a pointless micro-optimization. There
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is no longer any use to having a separate copy in libpthread, but
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the historical ABI requires it. For static linking, there is no
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need to provide anything here--the libc version will be linked in.
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For shared library ABI compatibility, there must be __vfork and
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vfork symbols in libpthread.so.
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As of GCC 7, microblaze can *not* rely on the compiler to generate
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a tail call from this vfork to __libc_vfork. */
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#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
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|| SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
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ENTRY (vfork_compat)
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bri __libc_vfork
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END (vfork_compat)
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#endif
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#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
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compat_symbol (libpthread, vfork_compat, vfork, GLIBC_2_0)
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#endif
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#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
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strong_alias (vfork_compat, vfork_compat2)
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compat_symbol (libpthread, vfork_compat2, __vfork, GLIBC_2_1_2)
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#endif
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@ -43,3 +43,4 @@ PSEUDO_END (__vfork)
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libc_hidden_def (__vfork)
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weak_alias (__vfork, vfork)
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strong_alias (__vfork, __libc_vfork)
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