1 files changed, 102 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/alpha/bits/atomicity.h b/libc/sysdeps/linux/alpha/bits/atomicity.h
new file mode 100644
index 000000000..9388f2384
--- /dev/null
+++ b/libc/sysdeps/linux/alpha/bits/atomicity.h
@@ -0,0 +1,102 @@
+/* Low-level functions for atomic operations.  Alpha version.
+   Copyright (C) 1999 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>
+
+
+static inline int
+__attribute__ ((unused))
+exchange_and_add (volatile uint32_t *mem, int val)
+{
+  register int result, tmp;
+
+  __asm__ __volatile__ (
+	"/* Inline exchange & add */\n"
+	"1:\t"
+	"ldl_l	%0,%3\n\t"
+	"addl	%0,%4,%1\n\t"
+	"stl_c	%1,%2\n\t"
+	"beq	%1,2f\n"
+	".subsection 1\n"
+	"2:\t"
+	"br	1b\n"
+	".previous\n\t"
+	"mb\n\t"
+	"/* End exchange & add */"
+	: "=&r"(result), "=&r"(tmp), "=m"(*mem)
+	: "m" (*mem), "r"(val));
+
+  return result;
+}
+
+static inline void
+__attribute__ ((unused))
+atomic_add (volatile uint32_t *mem, int val)
+{
+  register int result;
+
+  __asm__ __volatile__ (
+	"/* Inline exchange & add */\n"
+	"1:\t"
+	"ldl_l	%0,%2\n\t"
+	"addl	%0,%3,%0\n\t"
+	"stl_c	%0,%1\n\t"
+	"beq	%0,2f\n\t"
+	".subsection 1\n"
+	"2:\t"
+	"br	1b\n"
+	".previous\n\t"
+	"mb\n\t"
+	"/* End exchange & add */"
+	: "=&r"(result), "=m"(*mem)
+	: "m" (*mem), "r"(val));
+}
+
+static inline long
+__attribute__ ((unused))
+compare_and_swap (volatile long int *p, long int oldval, long int newval)
+{
+  long int ret;
+
+  __asm__ __volatile__ (
+	"/* Inline compare & swap */\n"
+	"1:\t"
+	"ldq_l	%0,%4\n\t"
+	"cmpeq	%0,%2,%0\n\t"
+	"beq	%0,3f\n\t"
+	"mov	%3,%0\n\t"
+	"stq_c	%0,%1\n\t"
+	"beq	%0,2f\n\t"
+	".subsection 1\n"
+	"2:\t"
+	"br	1b\n"
+	".previous\n\t"
+	"3:\t"
+	"mb\n\t"
+	"/* End compare & swap */"
+	: "=&r"(ret), "=m"(*p)
+	: "r"(oldval), "r"(newval), "m"(*p));
+
+  return ret;
+}
+
+#endif /* atomicity.h */