1 files changed, 104 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/powerpc/bits/atomicity.h b/libc/sysdeps/linux/powerpc/bits/atomicity.h
new file mode 100644
index 000000000..a3f672e5e
--- /dev/null
+++ b/libc/sysdeps/linux/powerpc/bits/atomicity.h
@@ -0,0 +1,104 @@
+/* Low-level functions for atomic operations.  PowerPC version.
+   Copyright (C) 1997, 1998, 1999, 2000 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _ATOMICITY_H
+#define _ATOMICITY_H	1
+
+#include <inttypes.h>
+
+#if BROKEN_PPC_ASM_CR0
+# define __ATOMICITY_INLINE /* nothing */
+#else
+# define __ATOMICITY_INLINE inline
+#endif
+
+static __ATOMICITY_INLINE int
+__attribute__ ((unused))
+exchange_and_add (volatile uint32_t *mem, int val)
+{
+  int tmp, result;
+  __asm__ ("\n\
+0:	lwarx	%0,0,%2	\n\
+	add%I3	%1,%0,%3	\n\
+	stwcx.	%1,0,%2	\n\
+	bne-	0b	\n\
+" : "=&b"(result), "=&r"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
+  return result;
+}
+
+static __ATOMICITY_INLINE void
+__attribute__ ((unused))
+atomic_add (volatile uint32_t *mem, int val)
+{
+  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" (mem), "Ir"(val) : "cr0", "memory");
+}
+
+static __ATOMICITY_INLINE int
+__attribute__ ((unused))
+compare_and_swap (volatile long int *p, long int oldval, long int newval)
+{
+  int result;
+  __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"(result) : "r"(p), "Ir"(oldval), "r"(newval) : "cr0", "memory");
+  return result >> 5;
+}
+
+static __ATOMICITY_INLINE long int
+__attribute__ ((unused))
+always_swap (volatile long int *p, long int newval)
+{
+  long int result;
+  __asm__ ("\n\
+0:	lwarx	%0,0,%1	\n\
+	stwcx.	%2,0,%1	\n\
+	bne-	0b	\n\
+" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
+  return result;
+}
+
+static __ATOMICITY_INLINE int
+__attribute__ ((unused))
+test_and_set (volatile long int *p, long int newval)
+{
+  int result;
+  __asm__ ("\n\
+0:	lwarx	%0,0,%1	\n\
+	cmpwi	%0,0	\n\
+	bne-	1f	\n\
+	stwcx.	%2,0,%1	\n\
+	bne-	0b	\n\
+1:	\n\
+" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
+  return result;
+}
+
+#endif /* atomicity.h */