Atomic operation functions for Alpha.

diff --git a/sysdeps/alpha/atomicity.h b/sysdeps/alpha/atomicity.h
new file mode 100644 (file)
index 0000000..34a538f
--- /dev/null
+++ b/sysdeps/alpha/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 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 _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 2\n"
+       "2:\t"
+       "br     1b\n"
+       ".subsection 1\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 2\n"
+       "2:\t"
+       "br     1b\n"
+       ".subsection 1\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 2\n"
+       "2:\t"
+       "br     1b\n"
+       ".subsection 1\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 */