mirror of
https://sourceware.org/git/glibc.git
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[arm] Remove linuxthreads support.
This commit is contained in:
Ulrich Weigand
Joseph Myers
parent
b53600e5ca
commit
ea4774c3f3
@ -1,3 +1,9 @@
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2011-03-21 Ulrich Weigand <ulrich.weigand@linaro.org>
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* sysdeps/arm/linuxthreads: Remove directory.
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* sysdeps/unix/sysv/linux/arm/linuxthreads: Likewise.
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* sysdeps/unix/sysv/linux/arm/eabi/linuxthreads: Likewise.
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2011-03-21 Ulrich Weigand <ulrich.weigand@linaro.org>
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* sysdeps/unix/sysv/linux/arm/eabi/nptl/sysdep-cancel.h (PSEUDO): Add
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@ -1,82 +0,0 @@
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/* POSIX spinlock implementation. Arm version.
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Copyright (C) 2000 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 License as
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published by the Free Software Foundation; either version 2.1 of the
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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; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <pthread.h>
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#include "internals.h"
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int
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__pthread_spin_lock (pthread_spinlock_t *lock)
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{
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unsigned int val;
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do
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asm volatile ("swp %0, %1, [%2]"
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: "=r" (val)
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: "0" (1), "r" (lock)
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: "memory");
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while (val != 0);
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return 0;
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}
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weak_alias (__pthread_spin_lock, pthread_spin_lock)
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int
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__pthread_spin_trylock (pthread_spinlock_t *lock)
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{
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unsigned int val;
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asm volatile ("swp %0, %1, [%2]"
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: "=r" (val)
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: "0" (1), "r" (lock)
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: "memory");
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return val ? EBUSY : 0;
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}
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weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
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int
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__pthread_spin_unlock (pthread_spinlock_t *lock)
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{
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return *lock = 0;
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}
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weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
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int
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__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
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{
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/* We can ignore the `pshared' parameter. Since we are busy-waiting
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all processes which can access the memory location `lock' points
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to can use the spinlock. */
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return *lock = 0;
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}
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weak_alias (__pthread_spin_init, pthread_spin_init)
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int
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__pthread_spin_destroy (pthread_spinlock_t *lock)
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{
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/* Nothing to do. */
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return 0;
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}
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weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
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@ -1,55 +0,0 @@
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/* Machine-dependent pthreads configuration and inline functions.
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ARM version.
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Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Philip Blundell <philb@gnu.org>.
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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 License as
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published by the Free Software Foundation; either version 2.1 of the
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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; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _PT_MACHINE_H
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#define _PT_MACHINE_H 1
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#ifndef PT_EI
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# define PT_EI extern inline __attribute__ ((always_inline))
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#endif
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extern long int testandset (int *spinlock);
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extern int __compare_and_swap (long int *p, long int oldval, long int newval);
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/* This will not work on ARM1 or ARM2 because SWP is lacking on those
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machines. Unfortunately we have no way to detect this at compile
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time; let's hope nobody tries to use one. */
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/* Spinlock implementation; required. */
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PT_EI long int
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testandset (int *spinlock)
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{
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register unsigned int ret;
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__asm__ __volatile__("swp %0, %1, [%2]"
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: "=r"(ret)
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: "0"(1), "r"(spinlock));
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return ret;
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}
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/* Get some notion of the current stack. Need not be exactly the top
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of the stack, just something somewhere in the current frame. */
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#define CURRENT_STACK_FRAME stack_pointer
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register char * stack_pointer __asm__ ("sp");
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#endif /* pt-machine.h */
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@ -1,172 +0,0 @@
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/* Definitions for thread-local data handling. linuxthreads/ARM version.
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Copyright (C) 2004 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _TLS_H
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#define _TLS_H
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#ifndef __ASSEMBLER__
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# include <stdbool.h>
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# include <pt-machine.h>
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# include <stddef.h>
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/* Type for the dtv. */
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typedef union dtv
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{
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size_t counter;
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struct
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{
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void *val;
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bool is_static;
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} pointer;
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} dtv_t;
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typedef struct
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{
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dtv_t *dtv;
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/* Reserved for the thread implementation. Unused in LinuxThreads. */
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void *private;
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} tcbhead_t;
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#endif
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/* We can support TLS only if the floating-stack support is available.
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However, we want to compile in the support and test at runtime whether
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the running kernel can support it or not. To avoid bothering with the
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TLS support code at all, use configure --without-tls.
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We need USE_TLS to be consistently defined, for ldsodefs.h conditionals.
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But some of the code below can cause problems in building libpthread
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(e.g. useldt.h will defined FLOATING_STACKS when it shouldn't). */
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/* LinuxThreads can only support TLS if both floating stacks and support
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from the tools are available.
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We have to define USE_TLS consistently, or ldsodefs.h will lay out types
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differently between an NPTL build and a LinuxThreads build. It can be set
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for libc.so and not libpthread.so, but only if we provide appropriate padding
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in the _pthread_descr_struct.
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Currently nothing defines FLOATING_STACKS. We could assume this based on
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kernel version once the TLS patches are available in kernel.org.
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To avoid bothering with the TLS support code at all, use configure
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--without-tls. */
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#if defined HAVE_TLS_SUPPORT \
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&& (defined FLOATING_STACKS || !defined IS_IN_libpthread)
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/* Signal that TLS support is available. */
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# define USE_TLS 1
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/* Include padding in _pthread_descr_struct so that libc can find p_errno,
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if libpthread will only include the padding because of the !IS_IN_libpthread
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check. */
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#ifndef FLOATING_STACKS
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# define INCLUDE_TLS_PADDING 1
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#endif
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# ifndef __ASSEMBLER__
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/* Get system call information. */
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# include <sysdep.h>
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/* This is the size of the initial TCB. */
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# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
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/* Alignment requirements for the initial TCB. */
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# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
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/* This is the size of the TCB. */
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# define TLS_TCB_SIZE sizeof (tcbhead_t)
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/* Alignment requirements for the TCB. */
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# define TLS_TCB_ALIGN __alignof__ (tcbhead_t)
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/* This is the size we need before TCB. */
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# define TLS_PRE_TCB_SIZE sizeof (struct _pthread_descr_struct)
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/* The DTV is allocated at the TP; the TCB is placed elsewhere. */
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# define TLS_DTV_AT_TP 1
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/* Install the dtv pointer. The pointer passed is to the element with
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index -1 which contain the length. */
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# define INSTALL_DTV(TCBP, DTVP) \
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(((tcbhead_t *) (TCBP))->dtv = (DTVP) + 1)
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/* Install new dtv for current thread. */
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# define INSTALL_NEW_DTV(DTV) \
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(((tcbhead_t *)__builtin_thread_pointer ())->dtv = (DTV))
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/* Return dtv of given thread descriptor. */
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# define GET_DTV(TCBP) \
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(((tcbhead_t *) (TCBP))->dtv)
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/* Code to initially initialize the thread pointer. This might need
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special attention since 'errno' is not yet available and if the
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operation can cause a failure 'errno' must not be touched. */
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# define TLS_INIT_TP(TCBP, SECONDCALL) \
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({ INTERNAL_SYSCALL_DECL (err); \
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long result_var; \
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result_var = INTERNAL_SYSCALL_ARM (set_tls, err, 1, (TCBP)); \
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INTERNAL_SYSCALL_ERROR_P (result_var, err) \
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? "unknown error" : NULL; })
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/* Return the address of the dtv for the current thread. */
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# define THREAD_DTV() \
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(((tcbhead_t *)__builtin_thread_pointer ())->dtv)
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/* Return the thread descriptor for the current thread. */
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# undef THREAD_SELF
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# define THREAD_SELF \
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((pthread_descr)__builtin_thread_pointer () - 1)
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# undef INIT_THREAD_SELF
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# define INIT_THREAD_SELF(DESCR, NR) \
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TLS_INIT_TP ((struct _pthread_descr_struct *)(DESCR) + 1, 0)
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/* Get the thread descriptor definition. */
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# include <linuxthreads/descr.h>
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/* ??? Generic bits of LinuxThreads may call these macros with
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DESCR set to NULL. We are expected to be able to reference
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the "current" value.
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In our case, we'd really prefer to use DESCR, since lots of
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PAL_code calls would be expensive. We can only trust that
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the compiler does its job and unifies the multiple
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__builtin_thread_pointer instances. */
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#define THREAD_GETMEM(descr, member) \
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((void) sizeof (descr), THREAD_SELF->member)
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#define THREAD_GETMEM_NC(descr, member) \
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((void) sizeof (descr), THREAD_SELF->member)
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#define THREAD_SETMEM(descr, member, value) \
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((void) sizeof (descr), THREAD_SELF->member = (value))
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#define THREAD_SETMEM_NC(descr, member, value) \
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((void) sizeof (descr), THREAD_SELF->member = (value))
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/* Initializing the thread pointer will generate a SIGILL if the syscall
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is not available. */
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#define TLS_INIT_TP_EXPENSIVE 1
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# endif /* HAVE_TLS_SUPPORT */
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#endif /* __ASSEMBLER__ */
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#endif /* tls.h */
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@ -1,116 +0,0 @@
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/* Copyright (C) 2003, 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
|
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|
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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, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
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|
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#include <sysdep.h>
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#ifndef __ASSEMBLER__
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# include <linuxthreads/internals.h>
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#endif
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#if !defined NOT_IN_libc || defined IS_IN_libpthread
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.section ".text"; \
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PSEUDO_PROLOGUE; \
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ENTRY (name); \
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SINGLE_THREAD_P; \
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DOARGS_##args; \
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bne .Lpseudo_cancel; \
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mov ip, r7; \
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ldr r7, =SYS_ify (syscall_name); \
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swi 0x0; \
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mov r7, ip; \
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UNDOARGS_##args; \
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cmn r0, $4096; \
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PSEUDO_RET; \
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.Lpseudo_cancel: \
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DOCARGS_##args; /* save syscall args etc. around CENABLE. */ \
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CENABLE; \
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mov ip, r0; /* put mask in safe place. */ \
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UNDOCARGS_##args; /* restore syscall args. */ \
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ldr r7, =SYS_ify (syscall_name); \
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swi 0x0; /* do the call. */ \
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mov r7, r0; /* save syscall return value. */ \
|
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mov r0, ip; /* get mask back. */ \
|
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CDISABLE; \
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mov r0, r7; /* retrieve return value. */ \
|
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RESTORE_LR_##args; \
|
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UNDOARGS_##args; \
|
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cmn r0, $4096;
|
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|
||||
/* DOARGS pushes four bytes on the stack for five arguments, eight bytes for
|
||||
six arguments, and nothing for fewer. In order to preserve doubleword
|
||||
alignment, sometimes we must save an extra register. */
|
||||
|
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# define DOCARGS_0 stmfd sp!, {r7, lr}
|
||||
# define UNDOCARGS_0
|
||||
# define RESTORE_LR_0 ldmfd sp!, {r7, lr}
|
||||
|
||||
# define DOCARGS_1 stmfd sp!, {r0, r1, r7, lr}
|
||||
# define UNDOCARGS_1 ldr r0, [sp], #8
|
||||
# define RESTORE_LR_1 RESTORE_LR_0
|
||||
|
||||
# define DOCARGS_2 stmfd sp!, {r0, r1, r7, lr}
|
||||
# define UNDOCARGS_2 ldmfd sp!, {r0, r1}
|
||||
# define RESTORE_LR_2 RESTORE_LR_0
|
||||
|
||||
# define DOCARGS_3 stmfd sp!, {r0, r1, r2, r3, r7, lr}
|
||||
# define UNDOCARGS_3 ldmfd sp!, {r0, r1, r2, r3}
|
||||
# define RESTORE_LR_3 RESTORE_LR_0
|
||||
|
||||
# define DOCARGS_4 stmfd sp!, {r0, r1, r2, r3, r7, lr}
|
||||
# define UNDOCARGS_4 ldmfd sp!, {r0, r1, r2, r3}
|
||||
# define RESTORE_LR_4 RESTORE_LR_0
|
||||
|
||||
# define DOCARGS_5 stmfd sp!, {r0, r1, r2, r3, r4, r7, lr}
|
||||
# define UNDOCARGS_5 ldmfd sp!, {r0, r1, r2, r3}
|
||||
# define RESTORE_LR_5 ldmfd sp!, {r4, r7, lr}
|
||||
|
||||
# define DOCARGS_6 stmfd sp!, {r0, r1, r2, r3, r7, lr}
|
||||
# define UNDOCARGS_6 ldmfd sp!, {r0, r1, r2, r3}
|
||||
# define RESTORE_LR_6 RESTORE_LR_0
|
||||
|
||||
# ifdef IS_IN_libpthread
|
||||
# define CENABLE bl PLTJMP(__pthread_enable_asynccancel)
|
||||
# define CDISABLE bl PLTJMP(__pthread_disable_asynccancel)
|
||||
# define __local_multiple_threads __pthread_multiple_threads
|
||||
# else
|
||||
# define CENABLE bl PLTJMP(__libc_enable_asynccancel)
|
||||
# define CDISABLE bl PLTJMP(__libc_disable_asynccancel)
|
||||
# define __local_multiple_threads __libc_multiple_threads
|
||||
# endif
|
||||
|
||||
# ifndef __ASSEMBLER__
|
||||
extern int __local_multiple_threads attribute_hidden;
|
||||
# define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
|
||||
# else
|
||||
# define SINGLE_THREAD_P \
|
||||
ldr ip, 1b; \
|
||||
2: \
|
||||
ldr ip, [pc, ip]; \
|
||||
teq ip, #0;
|
||||
# define PSEUDO_PROLOGUE \
|
||||
1: .word __local_multiple_threads - 2f - 8;
|
||||
# endif
|
||||
|
||||
#else
|
||||
|
||||
/* For rtld, et cetera. */
|
||||
# define SINGLE_THREAD_P 1
|
||||
|
||||
#endif
|
||||
@ -1 +0,0 @@
|
||||
#include <linuxthreads/sysdeps/unix/sysv/linux/fork.c>
|
||||
@ -1,129 +0,0 @@
|
||||
/* Copyright (C) 2003, 2005 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
Contributed by Phil Blundell <pb@nexus.co.uk>, 2003.
|
||||
|
||||
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, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
#include <sysdep.h>
|
||||
#ifndef __ASSEMBLER__
|
||||
# include <linuxthreads/internals.h>
|
||||
#endif
|
||||
|
||||
#if !defined NOT_IN_libc || defined IS_IN_libpthread
|
||||
|
||||
/* We push lr onto the stack, so we have to use ldmib instead of ldmia
|
||||
to find the saved arguments. */
|
||||
# ifdef PIC
|
||||
# undef DOARGS_5
|
||||
# undef DOARGS_6
|
||||
# undef DOARGS_7
|
||||
# define DOARGS_5 str r4, [sp, $-4]!; ldr r4, [sp, $8];
|
||||
# define DOARGS_6 mov ip, sp; stmfd sp!, {r4, r5}; ldmib ip, {r4, r5};
|
||||
# define DOARGS_7 mov ip, sp; stmfd sp!, {r4, r5, r6}; ldmib ip, {r4, r5, r6};
|
||||
# endif
|
||||
|
||||
# undef PSEUDO_RET
|
||||
# define PSEUDO_RET \
|
||||
ldrcc pc, [sp], $4; \
|
||||
ldr lr, [sp], $4; \
|
||||
b PLTJMP(SYSCALL_ERROR)
|
||||
|
||||
# undef PSEUDO
|
||||
# define PSEUDO(name, syscall_name, args) \
|
||||
.section ".text"; \
|
||||
PSEUDO_PROLOGUE; \
|
||||
ENTRY (name); \
|
||||
SINGLE_THREAD_P; \
|
||||
bne .Lpseudo_cancel; \
|
||||
DO_CALL (syscall_name, args); \
|
||||
cmn r0, $4096; \
|
||||
RETINSTR(cc, lr); \
|
||||
b PLTJMP(SYSCALL_ERROR); \
|
||||
.Lpseudo_cancel: \
|
||||
str lr, [sp, $-4]!; \
|
||||
DOCARGS_##args; /* save syscall args around CENABLE. */ \
|
||||
CENABLE; \
|
||||
mov ip, r0; /* put mask in safe place. */ \
|
||||
UNDOCARGS_##args; /* restore syscall args. */ \
|
||||
swi SYS_ify (syscall_name); /* do the call. */ \
|
||||
str r0, [sp, $-4]!; /* save syscall return value. */ \
|
||||
mov r0, ip; /* get mask back. */ \
|
||||
CDISABLE; \
|
||||
ldr r0, [sp], $4; /* retrieve return value. */ \
|
||||
UNDOC2ARGS_##args; /* fix register damage. */ \
|
||||
cmn r0, $4096;
|
||||
|
||||
# define DOCARGS_0
|
||||
# define UNDOCARGS_0
|
||||
# define UNDOC2ARGS_0
|
||||
|
||||
# define DOCARGS_1 str r0, [sp, #-4]!;
|
||||
# define UNDOCARGS_1 ldr r0, [sp], #4;
|
||||
# define UNDOC2ARGS_1
|
||||
|
||||
# define DOCARGS_2 str r1, [sp, #-4]!; str r0, [sp, #-4]!;
|
||||
# define UNDOCARGS_2 ldr r0, [sp], #4; ldr r1, [sp], #4;
|
||||
# define UNDOC2ARGS_2
|
||||
|
||||
# define DOCARGS_3 str r2, [sp, #-4]!; str r1, [sp, #-4]!; str r0, [sp, #-4]!;
|
||||
# define UNDOCARGS_3 ldr r0, [sp], #4; ldr r1, [sp], #4; ldr r2, [sp], #4
|
||||
# define UNDOC2ARGS_3
|
||||
|
||||
# define DOCARGS_4 stmfd sp!, {r0-r3}
|
||||
# define UNDOCARGS_4 ldmfd sp!, {r0-r3}
|
||||
# define UNDOC2ARGS_4
|
||||
|
||||
# define DOCARGS_5 stmfd sp!, {r0-r3}
|
||||
# define UNDOCARGS_5 ldmfd sp, {r0-r3}; str r4, [sp, #-4]!; ldr r4, [sp, #24]
|
||||
# define UNDOC2ARGS_5 ldr r4, [sp], #20
|
||||
|
||||
# ifdef IS_IN_libpthread
|
||||
# define CENABLE bl PLTJMP(__pthread_enable_asynccancel)
|
||||
# define CDISABLE bl PLTJMP(__pthread_disable_asynccancel)
|
||||
# define __local_multiple_threads __pthread_multiple_threads
|
||||
# else
|
||||
# define CENABLE bl PLTJMP(__libc_enable_asynccancel)
|
||||
# define CDISABLE bl PLTJMP(__libc_disable_asynccancel)
|
||||
# define __local_multiple_threads __libc_multiple_threads
|
||||
# endif
|
||||
|
||||
# ifndef __ASSEMBLER__
|
||||
extern int __local_multiple_threads attribute_hidden;
|
||||
# define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
|
||||
# else
|
||||
# if !defined PIC
|
||||
# define SINGLE_THREAD_P \
|
||||
ldr ip, =__local_multiple_threads; \
|
||||
ldr ip, [ip]; \
|
||||
teq ip, #0;
|
||||
# define PSEUDO_PROLOGUE
|
||||
# else
|
||||
# define SINGLE_THREAD_P \
|
||||
ldr ip, 1b; \
|
||||
2: \
|
||||
ldr ip, [pc, ip]; \
|
||||
teq ip, #0;
|
||||
# define PSEUDO_PROLOGUE \
|
||||
1: .word __local_multiple_threads - 2f - 8;
|
||||
# endif
|
||||
# endif
|
||||
|
||||
#elif !defined __ASSEMBLER__
|
||||
|
||||
/* This code should never be used but we define it anyhow. */
|
||||
# define SINGLE_THREAD_P (1)
|
||||
|
||||
#endif
|
||||
@ -1,78 +0,0 @@
|
||||
/* Copyright (C) 1999, 2002, 2003, 2005 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
Contributed by Philip Blundell <philb@gnu.org>.
|
||||
|
||||
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, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
#include <sysdep-cancel.h>
|
||||
#define _ERRNO_H 1
|
||||
#include <bits/errno.h>
|
||||
#include <kernel-features.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. */
|
||||
|
||||
ENTRY (__vfork)
|
||||
|
||||
#ifdef __NR_vfork
|
||||
|
||||
#ifdef SHARED
|
||||
ldr ip, 1f
|
||||
ldr r0, 2f
|
||||
3: add ip, pc, ip
|
||||
ldr r0, [ip, r0]
|
||||
#else
|
||||
ldr r0, 1f
|
||||
#endif
|
||||
movs r0, r0
|
||||
bne HIDDEN_JUMPTARGET (__fork)
|
||||
|
||||
DO_CALL (vfork, 0)
|
||||
cmn a1, #4096
|
||||
RETINSTR(cc, lr)
|
||||
|
||||
#ifndef __ASSUME_VFORK_SYSCALL
|
||||
/* Check if vfork syscall is known at all. */
|
||||
cmn a1, #ENOSYS
|
||||
bne PLTJMP(C_SYMBOL_NAME(__syscall_error))
|
||||
#endif
|
||||
|
||||
#endif
|
||||
|
||||
#ifndef __ASSUME_VFORK_SYSCALL
|
||||
/* If we don't have vfork, fork is close enough. */
|
||||
DO_CALL (fork, 0)
|
||||
cmn a1, #4096
|
||||
RETINSTR(cc, lr)
|
||||
#elif !defined __NR_vfork
|
||||
# error "__NR_vfork not available and __ASSUME_VFORK_SYSCALL defined"
|
||||
#endif
|
||||
b PLTJMP(C_SYMBOL_NAME(__syscall_error))
|
||||
|
||||
#ifdef SHARED
|
||||
1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 8
|
||||
2: .word __libc_pthread_functions(GOTOFF)
|
||||
#else
|
||||
.weak pthread_create
|
||||
1: .word pthread_create
|
||||
#endif
|
||||
|
||||
PSEUDO_END (__vfork)
|
||||
libc_hidden_def (__vfork)
|
||||
|
||||
weak_alias (__vfork, vfork)
|
||||
Loading…
Reference in New Issue
Block a user