Revert "resolve merge"

This reverts commit 6b6ede3d15f04fe825cfa9f697507457e3640344.

2 files changed, 188 insertions, 0 deletions

diff --git a/libpthread/linuxthreads/sysdeps/powerpc/powerpc32/pspinlock.c b/libpthread/linuxthreads/sysdeps/powerpc/powerpc32/pspinlock.c
new file mode 100644
index 000000000..875aa3876
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/powerpc/powerpc32/pspinlock.c
@@ -0,0 +1,69 @@
+/* POSIX spinlock implementation.  PowerPC version.
+   Copyright (C) 2000, 2003 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; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include "internals.h"
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  while (! __compare_and_swap ((long int *)lock, 0, 1))
+    ;
+  return 0;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  return __compare_and_swap ((long int *)lock, 0, 1) ? 0 : EBUSY;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  MEMORY_BARRIER ();
+  *lock = 0;
+  return 0;
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  *lock = 0;
+  return 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
diff --git a/libpthread/linuxthreads/sysdeps/powerpc/powerpc32/pt-machine.h b/libpthread/linuxthreads/sysdeps/powerpc/powerpc32/pt-machine.h
new file mode 100644
index 000000000..a2b8b61e6
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/powerpc/powerpc32/pt-machine.h
@@ -0,0 +1,119 @@
+/* Machine-dependent pthreads configuration and inline functions.
+   powerpc version.
+   Copyright (C) 1996, 1997, 1998, 2000, 2001, 2002, 2003
+   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; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+/* These routines are from Appendix G of the 'PowerPC 601 RISC Microprocessor
+   User's Manual', by IBM and Motorola.  */
+
+#ifndef _PT_MACHINE_H
+#define _PT_MACHINE_H   1
+
+#ifndef PT_EI
+# define PT_EI __extern_always_inline
+#endif
+
+extern long int testandset (int *spinlock);
+extern int __compare_and_swap (long int *p, long int oldval, long int newval);
+
+/* For multiprocessor systems, we want to ensure all memory accesses
+   are completed before we reset a lock.  On other systems, we still
+   need to make sure that the compiler has flushed everything to memory.  */
+#define MEMORY_BARRIER() __asm__ __volatile__ ("sync" : : : "memory")
+
+/* We want the OS to assign stack addresses.  */
+#define FLOATING_STACKS 1
+
+/* Maximum size of the stack if the rlimit is unlimited.  */
+#define ARCH_STACK_MAX_SIZE     8*1024*1024
+
+/* Get some notion of the current stack.  Need not be exactly the top
+   of the stack, just something somewhere in the current frame.  */
+#define CURRENT_STACK_FRAME  stack_pointer
+register char * stack_pointer __asm__ ("r1");
+
+/* Register r2 (tp) is reserved by the ABI as "thread pointer". */
+struct _pthread_descr_struct;
+register struct _pthread_descr_struct *__thread_self __asm__("r2");
+
+/* Return the thread descriptor for the current thread.  */
+#define THREAD_SELF  __thread_self
+
+/* Initialize the thread-unique value.  */
+#define INIT_THREAD_SELF(descr, nr)  (__thread_self = (descr))
+
+/* Access to data in the thread descriptor is easy.  */
+#define THREAD_GETMEM(descr, member) \
+  ((void) (descr), THREAD_SELF->member)
+#define THREAD_GETMEM_NC(descr, member) \
+  ((void) (descr), THREAD_SELF->member)
+#define THREAD_SETMEM(descr, member, value) \
+  ((void) (descr), THREAD_SELF->member = (value))
+#define THREAD_SETMEM_NC(descr, member, value) \
+  ((void) (descr), THREAD_SELF->member = (value))
+
+/* Compare-and-swap for semaphores. */
+/* note that test-and-set(x) is the same as !compare-and-swap(x, 0, 1) */
+
+#define HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS
+#define IMPLEMENT_TAS_WITH_CAS
+
+PT_EI int
+__compare_and_swap (long int *p, long int oldval, long int newval)
+{
+  int ret;
+
+  __asm__ __volatile__ (
+	   "0:    lwarx %0,0,%1 ;"
+	   "      xor. %0,%3,%0;"
+	   "      bne 1f;"
+	   "      stwcx. %2,0,%1;"
+	   "      bne- 0b;"
+	   "1:    "
+	: "=&r"(ret)
+	: "r"(p), "r"(newval), "r"(oldval)
+	: "cr0", "memory");
+  /* This version of __compare_and_swap is to be used when acquiring
+     a lock, so we don't need to worry about whether other memory
+     operations have completed, but we do need to be sure that any loads
+     after this point really occur after we have acquired the lock.  */
+  __asm__ __volatile__ ("isync" : : : "memory");
+  return ret == 0;
+}
+
+PT_EI int
+__compare_and_swap_with_release_semantics (long int *p,
+					   long int oldval, long int newval)
+{
+  int ret;
+
+  MEMORY_BARRIER ();
+  __asm__ __volatile__ (
+	   "0:    lwarx %0,0,%1 ;"
+	   "      xor. %0,%3,%0;"
+	   "      bne 1f;"
+	   "      stwcx. %2,0,%1;"
+	   "      bne- 0b;"
+	   "1:    "
+	: "=&r"(ret)
+	: "r"(p), "r"(newval), "r"(oldval)
+	: "cr0", "memory");
+  return ret == 0;
+}
+
+#endif /* pt-machine.h */