nptl: Remove vfork IFUNC-based forwarder from libpthread [BZ #20188]

With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so:
Support moving versioned symbols between sonames [BZ #24741]"), the
dynamic linker will find the definition of vfork in libc and binds
a vfork reference to that symbol, even if the soname in the version
reference says that the symbol should be located in libpthread.

As a result, the forwarder (whether it's IFUNC-based or a duplicate
of the libc implementation) is no longer necessary.

On older architectures, a placeholder symbol is required, to make sure
that the GLIBC_2.1.2 symbol version does not go away, or is turned in
to a weak symbol definition by the link editor.  (The symbol version
needs to preserved so that the symbol coverage check in
elf/dl-version.c does not fail for old binaries.)

mips32 is an outlier: It defined __vfork@@GLIBC_2.2, but the
baseline is GLIBC_2.0.  Since there are other @@GLIBC_2.2 symbols,
the placeholder symbol is not needed there.

35 files changed, 6 insertions, 327 deletions

diff --git a/sysdeps/unix/sysv/linux/aarch64/libpthread.abilist b/sysdeps/unix/sysv/linux/aarch64/libpthread.abilist
index 9a9e4cee85..6945b7cbe4 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libpthread.abilist
@@ -45,7 +45,6 @@ GLIBC_2.17 __read F
 GLIBC_2.17 __res_state F
 GLIBC_2.17 __send F
 GLIBC_2.17 __sigaction F
-GLIBC_2.17 __vfork F
 GLIBC_2.17 __wait F
 GLIBC_2.17 __write F
 GLIBC_2.17 _pthread_cleanup_pop F
@@ -216,7 +215,6 @@ GLIBC_2.17 siglongjmp F
 GLIBC_2.17 sigwait F
 GLIBC_2.17 system F
 GLIBC_2.17 tcdrain F
-GLIBC_2.17 vfork F
 GLIBC_2.17 wait F
 GLIBC_2.17 waitpid F
 GLIBC_2.17 write F
diff --git a/sysdeps/unix/sysv/linux/aarch64/pt-vfork.c b/sysdeps/unix/sysv/linux/aarch64/pt-vfork.c
deleted file mode 100644
index 3009f8d2fd..0000000000
--- a/sysdeps/unix/sysv/linux/aarch64/pt-vfork.c
+++ /dev/null
@@ -1,54 +0,0 @@
-/* vfork ABI-compatibility entry points for libpthread.
-   Copyright (C) 2014-2019 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <shlib-compat.h>
-
-/* 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 it.  For static linking, there is no
-   need to provide anything here--the libc version will be linked in.
-   For shared library ABI compatibility, there must be __vfork and
-   vfork symbols in libpthread.so.  */
-
-#if HAVE_IFUNC
-# include <nptl/pt-vfork.c>
-#elif (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
-       || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
-
-/* Thankfully, on AArch64 we can rely on the compiler generating
-   a tail call here.  */
-
-extern void __libc_vfork (void);
-
-void
-vfork_compat (void)
-{
-  __libc_vfork ();
-}
-
-# if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
-compat_symbol (libpthread, vfork_compat, vfork, GLIBC_2_0);
-# endif
-
-# if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
-strong_alias (vfork_compat, vfork_compat2)
-compat_symbol (libpthread, vfork_compat2, __vfork, GLIBC_2_1_2);
-# endif
-
-#endif
diff --git a/sysdeps/unix/sysv/linux/alpha/libpthread.abilist b/sysdeps/unix/sysv/linux/alpha/libpthread.abilist
index b413007ccb..2d9b958efa 100644
--- a/sysdeps/unix/sysv/linux/alpha/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libpthread.abilist
@@ -114,7 +114,6 @@ GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@ GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/alpha/pt-vfork.S b/sysdeps/unix/sysv/linux/alpha/pt-vfork.S
deleted file mode 100644
index 78aaaa8cee..0000000000
--- a/sysdeps/unix/sysv/linux/alpha/pt-vfork.S
+++ /dev/null
@@ -1,43 +0,0 @@
-/* vfork ABI-compatibility entry points for libpthread.
-   Copyright (C) 2014-2019 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <shlib-compat.h>
-
-/* 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 it.  For static linking, there is no
-   need to provide anything here--the libc version will be linked in.
-   For shared library ABI compatibility, there must be __vfork and
-   vfork symbols in libpthread.so.  */
-
-#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
-     || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
-
-#include <vfork.S>
-
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
-compat_symbol (libpthread, __libc_vfork, vfork, GLIBC_2_0);
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
-strong_alias (__libc_vfork, __vfork_compat)
-compat_symbol (libpthread, __vfork_compat, __vfork, GLIBC_2_1_2);
-#endif
diff --git a/sysdeps/unix/sysv/linux/arm/libpthread.abilist b/sysdeps/unix/sysv/linux/arm/libpthread.abilist
index af82a4c632..ee3d0290d0 100644
--- a/sysdeps/unix/sysv/linux/arm/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/arm/libpthread.abilist
@@ -74,7 +74,6 @@ GLIBC_2.4 __read F
 GLIBC_2.4 __res_state F
 GLIBC_2.4 __send F
 GLIBC_2.4 __sigaction F
-GLIBC_2.4 __vfork F
 GLIBC_2.4 __wait F
 GLIBC_2.4 __write F
 GLIBC_2.4 _pthread_cleanup_pop F
@@ -239,7 +238,6 @@ GLIBC_2.4 siglongjmp F
 GLIBC_2.4 sigwait F
 GLIBC_2.4 system F
 GLIBC_2.4 tcdrain F
-GLIBC_2.4 vfork F
 GLIBC_2.4 wait F
 GLIBC_2.4 waitpid F
 GLIBC_2.4 write F
diff --git a/sysdeps/unix/sysv/linux/csky/pt-vfork.S b/sysdeps/unix/sysv/linux/csky/pt-vfork.S
deleted file mode 100644
index 1cc8931700..0000000000
--- a/sysdeps/unix/sysv/linux/csky/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@
-/* Not needed.  */
diff --git a/sysdeps/unix/sysv/linux/hppa/libpthread.abilist b/sysdeps/unix/sysv/linux/hppa/libpthread.abilist
index bcba07f575..e9b3be6ac8 100644
--- a/sysdeps/unix/sysv/linux/hppa/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libpthread.abilist
@@ -46,7 +46,6 @@ GLIBC_2.2 __read F
 GLIBC_2.2 __res_state F
 GLIBC_2.2 __send F
 GLIBC_2.2 __sigaction F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 __wait F
 GLIBC_2.2 __write F
 GLIBC_2.2 _pthread_cleanup_pop F
@@ -192,7 +191,6 @@ GLIBC_2.2 siglongjmp F
 GLIBC_2.2 sigwait F
 GLIBC_2.2 system F
 GLIBC_2.2 tcdrain F
-GLIBC_2.2 vfork F
 GLIBC_2.2 wait F
 GLIBC_2.2 waitpid F
 GLIBC_2.2 write F
diff --git a/sysdeps/unix/sysv/linux/hppa/localplt.data b/sysdeps/unix/sysv/linux/hppa/localplt.data
index 5f3475de19..867413f0c5 100644
--- a/sysdeps/unix/sysv/linux/hppa/localplt.data
+++ b/sysdeps/unix/sysv/linux/hppa/localplt.data
@@ -10,7 +10,6 @@ libc.so: __sigsetjmp
 libc.so: _IO_funlockfile
 libc.so: __errno_location
 libm.so: matherr
-libpthread.so: __errno_location
 # The main malloc is interposed into the dynamic linker, for
 # allocations after the initial link (when dlopen is used).
 ld.so: malloc
diff --git a/sysdeps/unix/sysv/linux/hppa/pt-vfork.S b/sysdeps/unix/sysv/linux/hppa/pt-vfork.S
deleted file mode 100644
index 9d7dda8b63..0000000000
--- a/sysdeps/unix/sysv/linux/hppa/pt-vfork.S
+++ /dev/null
@@ -1,82 +0,0 @@
-/* Copyright (C) 2005-2019 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library.  If not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#define _ERRNO_H        1
-#include <bits/errno.h>
-#include <tcb-offsets.h>
-
-/* Clone the calling process, but without copying the whole address space.
-   The calling process is suspended until the new process exits or is
-   replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
-   and the process ID of the new process to the old process.  */
-
-.Lthread_start:						ASM_LINE_SEP
-
-	/* r26, r25, r24, r23 are free since vfork has no arguments */
-ENTRY(__vfork)
-	/* We must not create a frame. When the child unwinds to call
-	   exec it will clobber the same frame that the parent
-	   needs to unwind.  */
-
-	/* Save the PIC register. */
-#ifdef PIC
-	copy	%r19, %r25	/* parent */
-#endif
-
-	/* Syscall saves and restores all register states */
-	ble	0x100(%sr2,%r0)
-	ldi	__NR_vfork,%r20
-
-	/* Check for error */
-	ldi	-4096,%r1
-	comclr,>>= %r1,%ret0,%r0        /* Note: unsigned compare. */
-	b,n	.Lerror
-
-	/* Return, and DO NOT restore rp. The child may have called
-	   functions that updated the frame's rp. This works because
-	   the kernel ensures rp is preserved across the vfork
-	   syscall.  */
-	bv,n	%r0(%rp)
-
-.Lerror:
-	/* Now we need a stack to call a function. We are assured
-	   that there is no child now, so it's safe to create
-	   a frame.  */
-	stw	%rp, -20(%sp)
-	.cfi_offset 2, -20
-	stwm	%r3, 64(%sp)
-	.cfi_def_cfa_offset -64
-	.cfi_offset 3, 0
-	stw	%sp, -4(%sp)
-
-	sub	%r0,%ret0,%r3
-	SYSCALL_ERROR_HANDLER
-	/* Restore the PIC register (in delay slot) on error */
-#ifdef PIC
-	copy	%r25, %r19    /* parent */
-#else
-	nop
-#endif
-	/* Write syscall return into errno location */
-	stw	%r3, 0(%ret0)
-	ldw	-84(%sp), %rp
-	bv	%r0(%rp)
-	ldwm	-64(%sp), %r3
-PSEUDO_END (__vfork)
-libc_hidden_def (__vfork)
-weak_alias (__vfork, vfork)
diff --git a/sysdeps/unix/sysv/linux/i386/libpthread.abilist b/sysdeps/unix/sysv/linux/i386/libpthread.abilist
index bece86d246..7199aae573 100644
--- a/sysdeps/unix/sysv/linux/i386/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libpthread.abilist
@@ -114,7 +114,6 @@ GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@ GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/ia64/libpthread.abilist b/sysdeps/unix/sysv/linux/ia64/libpthread.abilist
index ccc9449826..e8a65642ca 100644
--- a/sysdeps/unix/sysv/linux/ia64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libpthread.abilist
@@ -46,7 +46,6 @@ GLIBC_2.2 __read F
 GLIBC_2.2 __res_state F
 GLIBC_2.2 __send F
 GLIBC_2.2 __sigaction F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 __wait F
 GLIBC_2.2 __write F
 GLIBC_2.2 _pthread_cleanup_pop F
@@ -192,7 +191,6 @@ GLIBC_2.2 siglongjmp F
 GLIBC_2.2 sigwait F
 GLIBC_2.2 system F
 GLIBC_2.2 tcdrain F
-GLIBC_2.2 vfork F
 GLIBC_2.2 wait F
 GLIBC_2.2 waitpid F
 GLIBC_2.2 write F
diff --git a/sysdeps/unix/sysv/linux/ia64/pt-vfork.S b/sysdeps/unix/sysv/linux/ia64/pt-vfork.S
deleted file mode 100644
index 73bf7b7ef3..0000000000
--- a/sysdeps/unix/sysv/linux/ia64/pt-vfork.S
+++ /dev/null
@@ -1,48 +0,0 @@
-/* vfork ABI-compatibility entry points for libpthread.  IA64 version.
-   Copyright (C) 2014-2019 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#include <shlib-compat.h>
-
-/* 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 it.  For static linking, there is no
-   need to provide anything here--the libc version will be linked in.
-   For shared library ABI compatibility, there must be __vfork and
-   vfork symbols in libpthread.so.  */
-
-#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
-     || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
-
-LOCAL_LEAF (vfork_compat)
-	br __libc_vfork
-	;;
-END (vfork_compat)
-
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
-weak_alias (vfork_compat, vfork)
-compat_symbol (libpthread, vfork_compat, vfork, GLIBC_2_0);
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
-strong_alias (vfork_compat, __vfork_compat)
-compat_symbol (libpthread, __vfork_compat, __vfork, GLIBC_2_1_2);
-#endif
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libpthread.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libpthread.abilist
index af82a4c632..ee3d0290d0 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libpthread.abilist
@@ -74,7 +74,6 @@ GLIBC_2.4 __read F
 GLIBC_2.4 __res_state F
 GLIBC_2.4 __send F
 GLIBC_2.4 __sigaction F
-GLIBC_2.4 __vfork F
 GLIBC_2.4 __wait F
 GLIBC_2.4 __write F
 GLIBC_2.4 _pthread_cleanup_pop F
@@ -239,7 +238,6 @@ GLIBC_2.4 siglongjmp F
 GLIBC_2.4 sigwait F
 GLIBC_2.4 system F
 GLIBC_2.4 tcdrain F
-GLIBC_2.4 vfork F
 GLIBC_2.4 wait F
 GLIBC_2.4 waitpid F
 GLIBC_2.4 write F
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libpthread.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libpthread.abilist
index bece86d246..7199aae573 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libpthread.abilist
@@ -114,7 +114,6 @@ GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@ GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/m68k/pt-vfork.c b/sysdeps/unix/sysv/linux/m68k/pt-vfork.c
deleted file mode 100644
index 5fbc6526aa..0000000000
--- a/sysdeps/unix/sysv/linux/m68k/pt-vfork.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/aarch64/pt-vfork.c>
diff --git a/sysdeps/unix/sysv/linux/microblaze/libpthread.abilist b/sysdeps/unix/sysv/linux/microblaze/libpthread.abilist
index 5067375d23..e0fbe6848f 100644
--- a/sysdeps/unix/sysv/linux/microblaze/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/libpthread.abilist
@@ -45,7 +45,6 @@ GLIBC_2.18 __read F
 GLIBC_2.18 __res_state F
 GLIBC_2.18 __send F
 GLIBC_2.18 __sigaction F
-GLIBC_2.18 __vfork F
 GLIBC_2.18 __wait F
 GLIBC_2.18 __write F
 GLIBC_2.18 _pthread_cleanup_pop F
@@ -218,7 +217,6 @@ GLIBC_2.18 siglongjmp F
 GLIBC_2.18 sigwait F
 GLIBC_2.18 system F
 GLIBC_2.18 tcdrain F
-GLIBC_2.18 vfork F
 GLIBC_2.18 wait F
 GLIBC_2.18 waitpid F
 GLIBC_2.18 write F
diff --git a/sysdeps/unix/sysv/linux/microblaze/pt-vfork.S b/sysdeps/unix/sysv/linux/microblaze/pt-vfork.S
deleted file mode 100644
index 205a28de24..0000000000
--- a/sysdeps/unix/sysv/linux/microblaze/pt-vfork.S
+++ /dev/null
@@ -1,49 +0,0 @@
-/* vfork ABI-compatibility entry points for libpthread.
-   Copyright (C) 2014-2019 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#include <shlib-compat.h>
-
-/* 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 it.  For static linking, there is no
-   need to provide anything here--the libc version will be linked in.
-   For shared library ABI compatibility, there must be __vfork and
-   vfork symbols in libpthread.so.
-
-   As of GCC 7, microblaze can *not* rely on the compiler to generate
-   a tail call from this vfork to __libc_vfork.  */
-
-#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
-       || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
-
-ENTRY (vfork_compat)
-	bri	__libc_vfork@PLT
-END (vfork_compat)
-
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
-compat_symbol (libpthread, vfork_compat, vfork, GLIBC_2_0)
-#endif
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
-strong_alias (vfork_compat, vfork_compat2)
-compat_symbol (libpthread, vfork_compat2, __vfork, GLIBC_2_1_2)
-#endif
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/libpthread.abilist b/sysdeps/unix/sysv/linux/mips/mips32/libpthread.abilist
index 02144967c6..f60b22efb5 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/libpthread.abilist
@@ -114,7 +114,6 @@ GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -140,7 +139,6 @@ GLIBC_2.2 __pthread_rwlock_unlock F
 GLIBC_2.2 __pthread_rwlock_wrlock F
 GLIBC_2.2 __pwrite64 F
 GLIBC_2.2 __res_state F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 lseek64 F
 GLIBC_2.2 open64 F
 GLIBC_2.2 pread F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/libpthread.abilist b/sysdeps/unix/sysv/linux/mips/mips64/libpthread.abilist
index 02144967c6..f60b22efb5 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/libpthread.abilist
@@ -114,7 +114,6 @@ GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -140,7 +139,6 @@ GLIBC_2.2 __pthread_rwlock_unlock F
 GLIBC_2.2 __pthread_rwlock_wrlock F
 GLIBC_2.2 __pwrite64 F
 GLIBC_2.2 __res_state F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 lseek64 F
 GLIBC_2.2 open64 F
 GLIBC_2.2 pread F
diff --git a/sysdeps/unix/sysv/linux/mips/pt-vfork.S b/sysdeps/unix/sysv/linux/mips/pt-vfork.S
deleted file mode 100644
index 65cc3823ac..0000000000
--- a/sysdeps/unix/sysv/linux/mips/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/alpha/pt-vfork.S>
diff --git a/sysdeps/unix/sysv/linux/nios2/pt-vfork.S b/sysdeps/unix/sysv/linux/nios2/pt-vfork.S
deleted file mode 100644
index 147427a42d..0000000000
--- a/sysdeps/unix/sysv/linux/nios2/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@
-# Nios2 does not require a stub for vfork in libpthread.
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/libpthread.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/libpthread.abilist
index 09e8447b06..c7d9b78986 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/libpthread.abilist
@@ -114,7 +114,6 @@ GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@ GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libpthread.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libpthread.abilist
index 8300958d47..3500cce6c1 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libpthread.abilist
@@ -68,7 +68,6 @@ GLIBC_2.3 __read F
 GLIBC_2.3 __res_state F
 GLIBC_2.3 __send F
 GLIBC_2.3 __sigaction F
-GLIBC_2.3 __vfork F
 GLIBC_2.3 __wait F
 GLIBC_2.3 __write F
 GLIBC_2.3 _pthread_cleanup_pop F
@@ -214,7 +213,6 @@ GLIBC_2.3 siglongjmp F
 GLIBC_2.3 sigwait F
 GLIBC_2.3 system F
 GLIBC_2.3 tcdrain F
-GLIBC_2.3 vfork F
 GLIBC_2.3 wait F
 GLIBC_2.3 waitpid F
 GLIBC_2.3 write F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libpthread.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libpthread.abilist
index 9a9e4cee85..6945b7cbe4 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libpthread.abilist
@@ -45,7 +45,6 @@ GLIBC_2.17 __read F
 GLIBC_2.17 __res_state F
 GLIBC_2.17 __send F
 GLIBC_2.17 __sigaction F
-GLIBC_2.17 __vfork F
 GLIBC_2.17 __wait F
 GLIBC_2.17 __write F
 GLIBC_2.17 _pthread_cleanup_pop F
@@ -216,7 +215,6 @@ GLIBC_2.17 siglongjmp F
 GLIBC_2.17 sigwait F
 GLIBC_2.17 system F
 GLIBC_2.17 tcdrain F
-GLIBC_2.17 vfork F
 GLIBC_2.17 wait F
 GLIBC_2.17 waitpid F
 GLIBC_2.17 write F
diff --git a/sysdeps/unix/sysv/linux/riscv/pt-vfork.S b/sysdeps/unix/sysv/linux/riscv/pt-vfork.S
deleted file mode 100644
index 1cc8931700..0000000000
--- a/sysdeps/unix/sysv/linux/riscv/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@
-/* Not needed.  */
diff --git a/sysdeps/unix/sysv/linux/s390/pt-vfork.S b/sysdeps/unix/sysv/linux/s390/pt-vfork.S
deleted file mode 100644
index 65cc3823ac..0000000000
--- a/sysdeps/unix/sysv/linux/s390/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/alpha/pt-vfork.S>
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libpthread.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libpthread.abilist
index d05468f3b2..f093634d7e 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libpthread.abilist
@@ -114,7 +114,6 @@ GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@ GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libpthread.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libpthread.abilist
index e8161aa747..47204f166c 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libpthread.abilist
@@ -48,7 +48,6 @@ GLIBC_2.2 __read F
 GLIBC_2.2 __res_state F
 GLIBC_2.2 __send F
 GLIBC_2.2 __sigaction F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 __wait F
 GLIBC_2.2 __write F
 GLIBC_2.2 _pthread_cleanup_pop F
@@ -194,7 +193,6 @@ GLIBC_2.2 siglongjmp F
 GLIBC_2.2 sigwait F
 GLIBC_2.2 system F
 GLIBC_2.2 tcdrain F
-GLIBC_2.2 vfork F
 GLIBC_2.2 wait F
 GLIBC_2.2 waitpid F
 GLIBC_2.2 write F
diff --git a/sysdeps/unix/sysv/linux/sh/libpthread.abilist b/sysdeps/unix/sysv/linux/sh/libpthread.abilist
index bcba07f575..e9b3be6ac8 100644
--- a/sysdeps/unix/sysv/linux/sh/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/sh/libpthread.abilist
@@ -46,7 +46,6 @@ GLIBC_2.2 __read F
 GLIBC_2.2 __res_state F
 GLIBC_2.2 __send F
 GLIBC_2.2 __sigaction F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 __wait F
 GLIBC_2.2 __write F
 GLIBC_2.2 _pthread_cleanup_pop F
@@ -192,7 +191,6 @@ GLIBC_2.2 siglongjmp F
 GLIBC_2.2 sigwait F
 GLIBC_2.2 system F
 GLIBC_2.2 tcdrain F
-GLIBC_2.2 vfork F
 GLIBC_2.2 wait F
 GLIBC_2.2 waitpid F
 GLIBC_2.2 write F
diff --git a/sysdeps/unix/sysv/linux/sh/pt-vfork.S b/sysdeps/unix/sysv/linux/sh/pt-vfork.S
deleted file mode 100644
index 65cc3823ac..0000000000
--- a/sysdeps/unix/sysv/linux/sh/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/alpha/pt-vfork.S>
diff --git a/sysdeps/unix/sysv/linux/sparc/pt-vfork.S b/sysdeps/unix/sysv/linux/sparc/pt-vfork.S
deleted file mode 100644
index 65cc3823ac..0000000000
--- a/sysdeps/unix/sysv/linux/sparc/pt-vfork.S
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/alpha/pt-vfork.S>
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libpthread.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libpthread.abilist
index b413007ccb..2d9b958efa 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libpthread.abilist
@@ -114,7 +114,6 @@ GLIBC_2.0 siglongjmp F
 GLIBC_2.0 sigwait F
 GLIBC_2.0 system F
 GLIBC_2.0 tcdrain F
-GLIBC_2.0 vfork F
 GLIBC_2.0 wait F
 GLIBC_2.0 waitpid F
 GLIBC_2.0 write F
@@ -155,7 +154,7 @@ GLIBC_2.1 sem_wait F
 GLIBC_2.1.1 sem_close F
 GLIBC_2.1.1 sem_open F
 GLIBC_2.1.1 sem_unlink F
-GLIBC_2.1.2 __vfork F
+GLIBC_2.1.2 __libpthread_version_placeholder F
 GLIBC_2.11 pthread_sigqueue F
 GLIBC_2.12 pthread_getname_np F
 GLIBC_2.12 pthread_mutex_consistent F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libpthread.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libpthread.abilist
index ccc9449826..e8a65642ca 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libpthread.abilist
@@ -46,7 +46,6 @@ GLIBC_2.2 __read F
 GLIBC_2.2 __res_state F
 GLIBC_2.2 __send F
 GLIBC_2.2 __sigaction F
-GLIBC_2.2 __vfork F
 GLIBC_2.2 __wait F
 GLIBC_2.2 __write F
 GLIBC_2.2 _pthread_cleanup_pop F
@@ -192,7 +191,6 @@ GLIBC_2.2 siglongjmp F
 GLIBC_2.2 sigwait F
 GLIBC_2.2 system F
 GLIBC_2.2 tcdrain F
-GLIBC_2.2 vfork F
 GLIBC_2.2 wait F
 GLIBC_2.2 waitpid F
 GLIBC_2.2 write F
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libpthread.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libpthread.abilist
index 931c8277a8..4fbb72ffb3 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libpthread.abilist
@@ -46,7 +46,6 @@ GLIBC_2.2.5 __read F
 GLIBC_2.2.5 __res_state F
 GLIBC_2.2.5 __send F
 GLIBC_2.2.5 __sigaction F
-GLIBC_2.2.5 __vfork F
 GLIBC_2.2.5 __wait F
 GLIBC_2.2.5 __write F
 GLIBC_2.2.5 _pthread_cleanup_pop F
@@ -193,7 +192,6 @@ GLIBC_2.2.5 siglongjmp F
 GLIBC_2.2.5 sigwait F
 GLIBC_2.2.5 system F
 GLIBC_2.2.5 tcdrain F
-GLIBC_2.2.5 vfork F
 GLIBC_2.2.5 wait F
 GLIBC_2.2.5 waitpid F
 GLIBC_2.2.5 write F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libpthread.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libpthread.abilist
index c09c9b015a..eec4b99b8b 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libpthread.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libpthread.abilist
@@ -45,7 +45,6 @@ GLIBC_2.16 __read F
 GLIBC_2.16 __res_state F
 GLIBC_2.16 __send F
 GLIBC_2.16 __sigaction F
-GLIBC_2.16 __vfork F
 GLIBC_2.16 __wait F
 GLIBC_2.16 __write F
 GLIBC_2.16 _pthread_cleanup_pop F
@@ -216,7 +215,6 @@ GLIBC_2.16 siglongjmp F
 GLIBC_2.16 sigwait F
 GLIBC_2.16 system F
 GLIBC_2.16 tcdrain F
-GLIBC_2.16 vfork F
 GLIBC_2.16 wait F
 GLIBC_2.16 waitpid F
 GLIBC_2.16 write F