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authorEric Andersen <andersen@codepoet.org>2004-07-15 07:34:00 +0000
committerEric Andersen <andersen@codepoet.org>2004-07-15 07:34:00 +0000
commit71150804d1ac8ed2f7b9c6d3025fd415c58b129e (patch)
treeaab8c892a813847614070f73e711178cd3c9ec74 /libc/sysdeps/linux/h8300/bits/atomicity.h
parent255fbb6abcef56c5f8c36383d49a902686f258f5 (diff)
h8300 updates from Yoshinori Sato
Diffstat (limited to 'libc/sysdeps/linux/h8300/bits/atomicity.h')
-rw-r--r--libc/sysdeps/linux/h8300/bits/atomicity.h79
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 */