1 files changed, 84 insertions, 0 deletions
diff --git a/sysdeps/powerpc/bits/atomic.h b/sysdeps/powerpc/bits/atomic.h
new file mode 100644
index 0000000..5ba19cd
--- /dev/null
+++ b/sysdeps/powerpc/bits/atomic.h
@@ -0,0 +1,84 @@
+/* Atomic operations.  PowerPC version.
+   Copyright (C) 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef _BITS_ATOMIC_H
+#define _BITS_ATOMIC_H	1
+
+typedef __volatile int __atomic_t;
+
+static inline void
+__atomic_inc (__atomic_t *__var)
+{
+  int tmp;
+  __asm__ ("\n\
+0:      lwarx   %0,0,%1 \n\
+        add%I2  %0,%0,%2        \n\
+        stwcx.  %0,0,%1 \n\
+        bne-    0b      \n\
+" : "=&b"(tmp) : "r" (__var), "Ir"(1) : "cr0", "memory");
+}
+
+static inline void
+__atomic_dec (__atomic_t *__var)
+{
+  int tmp;
+  __asm__ ("\n\
+0:      lwarx   %0,0,%1 \n\
+        add%I2  %0,%0,%2        \n\
+        stwcx.  %0,0,%1 \n\
+        bne-    0b      \n\
+" : "=&b"(tmp) : "r" (__var), "Ir"(-1) : "cr0", "memory");
+}
+
+static inline int
+__atomic_dec_and_test (__atomic_t *__var)
+{
+  unsigned char __ret;
+
+#if 0
+  __asm__ __volatile ("lock; decl %0; sete %1"
+		      : "=m" (*__var), "=qm" (__ret) : "m" (*__var));
+#endif
+  return __ret != 0;
+}
+
+/* We assume that an __atomicptr_t is only used for pointers to
+   word-aligned objects, and use the lowest bit for a simple lock.  */
+typedef __volatile int * __atomicptr_t;
+
+/* Actually we don't implement that yet, and assume that we run on
+   something that has the i486 instruction set.  */
+static inline int
+__atomicptr_compare_and_swap (__atomicptr_t *__ptr, void *__oldval,
+			      void * __newval)
+{
+  int __ret;
+  __asm__ ("\n\
+0:      lwarx   %0,0,%1 \n\
+        sub%I2c.        %0,%0,%2        \n\
+        cntlzw  %0,%0   \n\
+        bne-    1f      \n\
+        stwcx.  %3,0,%1 \n\
+        bne-    0b      \n\
+1:      \n\
+" : "=&b"(__ret) : "r"(__ptr), "Ir"(__oldval), "r"(__newval) : "cr0", "memory");
+  return __ret >> 5;
+}
+
+#endif