1 files changed, 79 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/h8300/bits/atomicity.h b/libc/sysdeps/linux/h8300/bits/atomicity.h
new file mode 100644
index 000000000..a4fcc1524
--- /dev/null
+++ b/libc/sysdeps/linux/h8300/bits/atomicity.h
@@ -0,0 +1,79 @@
+/* Low-level functions for atomic operations.  H8/300 version.
+   Copyright (C) 1997, 2000, 2001 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 uint32_t
+__attribute__ ((unused))
+exchange_and_add (volatile uint32_t *mem, uint32_t val)
+{
+  uint32_t result;
+  __asm__ __volatile__ ("stc ccr,@-sp\n\t"
+			"orc #0x80,ccr\n\t"
+			"mov.l %1,er1\n\t"
+			"mov.l %0,%1\n\t"
+			"add.l er1,%0\n\t"
+			"ldc @sp+,ccr"
+			: "=r" (result), "=m" (*mem) 
+			: "0" (val), "1" (*mem)
+			: "er1");
+  return result;
+}
+
+static inline void
+__attribute__ ((unused))
+atomic_add (volatile uint32_t *mem, int val)
+{
+  __asm__ __volatile__ ("stc ccr,@-sp\n\t"
+			"orc #0x80,ccr\n\t"
+			"mov.l %0,er0\n\t"
+			"add %1,er0\n\t"
+			"mov.l er0,%0\n\t"
+			"ldc @sp+,ccr"
+			: "=m" (*mem) 
+			: "r" (val), "0" (*mem)
+			: "er0");
+}
+
+static inline int
+__attribute__ ((unused))
+compare_and_swap (volatile long int *p, long int oldval, long int newval)
+{
+  int ret = 0;
+
+  __asm__ __volatile__ ("stc ccr,@-sp\n\t"
+			"orc #0x80,ccr\n\t"
+			"mov.l %1,er0\n\t"
+			"cmp.l %2,er0\n\t"
+			"bne 1f\n\t"
+			"mov.l %3,%1\n\t"
+			"inc.l #1,%0\n"
+			"1:\n\t"
+			"ldc @sp+,ccr"
+			: "=r"(ret),"=m"(*p)
+			: "r"(oldval),"r"(newval),"0"(ret),"1"(*p)
+			: "er0");
+  return ret;
+}
+
+#endif /* atomicity.h */