1 files changed, 98 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/mips/bits/atomicity.h b/libc/sysdeps/linux/mips/bits/atomicity.h
new file mode 100644
index 000000000..bccacd9c9
--- /dev/null
+++ b/libc/sysdeps/linux/mips/bits/atomicity.h
@@ -0,0 +1,98 @@
+/* Low-level functions for atomic operations. Mips version.
+   Copyright (C) 2001, 2002 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 _MIPS_ATOMICITY_H
+#define _MIPS_ATOMICITY_H    1
+
+#include <inttypes.h>
+
+static inline int
+__attribute__ ((unused))
+exchange_and_add (volatile uint32_t *mem, int val)
+{
+  int result, tmp;
+
+  __asm__ __volatile__
+    ("/* Inline exchange & add */\n"
+     "1:\n\t"
+     ".set	push\n\t"
+     ".set	mips2\n\t"
+     "ll	%0,%3\n\t"
+     "addu	%1,%4,%0\n\t"
+     "sc	%1,%2\n\t"
+     ".set	pop\n\t"
+     "beqz	%1,1b\n\t"
+     "/* End exchange & add */"
+     : "=&r"(result), "=&r"(tmp), "=m"(*mem)
+     : "m" (*mem), "r"(val)
+     : "memory");
+
+  return result;
+}
+
+static inline void
+__attribute__ ((unused))
+atomic_add (volatile uint32_t *mem, int val)
+{
+  int result;
+
+  __asm__ __volatile__
+    ("/* Inline atomic add */\n"
+     "1:\n\t"
+     ".set	push\n\t"
+     ".set	mips2\n\t"
+     "ll	%0,%2\n\t"
+     "addu	%0,%3,%0\n\t"
+     "sc	%0,%1\n\t"
+     ".set	pop\n\t"
+     "beqz	%0,1b\n\t"
+     "/* End atomic add */"
+     : "=&r"(result), "=m"(*mem)
+     : "m" (*mem), "r"(val)
+     : "memory");
+}
+
+static inline int
+__attribute__ ((unused))
+compare_and_swap (volatile long int *p, long int oldval, long int newval)
+{
+  long int ret, temp;
+
+  __asm__ __volatile__
+    ("/* Inline compare & swap */\n"
+     "1:\n\t"
+     ".set	push\n\t"
+     ".set	mips2\n\t"
+     "ll	%1,%5\n\t"
+     "move	%0,$0\n\t"
+     "bne	%1,%3,2f\n\t"
+     "move	%0,%4\n\t"
+     "sc	%0,%2\n\t"
+     ".set	pop\n\t"
+     "beqz	%0,1b\n"
+     "2:\n\t"
+     "/* End compare & swap */"
+     : "=&r" (ret), "=&r" (temp), "=m" (*p)
+     : "r" (oldval), "r" (newval), "m" (*p)
+     : "memory");
+
+  return ret;
+}
+
+#endif /* atomicity.h */