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-rw-r--r--libc/sysdeps/linux/sparc/bits/atomicity.h98
1 files changed, 98 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc/bits/atomicity.h b/libc/sysdeps/linux/sparc/bits/atomicity.h
new file mode 100644
index 000000000..ec82541c2
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/bits/atomicity.h
@@ -0,0 +1,98 @@
+/* Low-level functions for atomic operations. Sparc32 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 int
+__attribute__ ((unused))
+exchange_and_add (volatile uint32_t *mem, int val)
+{
+ static unsigned char lock;
+ int result, tmp;
+
+ __asm__ __volatile__("1: ldstub [%1], %0\n\t"
+ " cmp %0, 0\n\t"
+ " bne 1b\n\t"
+ " nop"
+ : "=&r" (tmp)
+ : "r" (&lock)
+ : "memory");
+ result = *mem;
+ *mem += val;
+ __asm__ __volatile__("stb %%g0, [%0]"
+ : /* no outputs */
+ : "r" (&lock)
+ : "memory");
+ return result;
+}
+
+static void
+__attribute__ ((unused))
+atomic_add (volatile uint32_t *mem, int val)
+{
+ static unsigned char lock;
+ int tmp;
+
+ __asm__ __volatile__("1: ldstub [%1], %0\n\t"
+ " cmp %0, 0\n\t"
+ " bne 1b\n\t"
+ " nop"
+ : "=&r" (tmp)
+ : "r" (&lock)
+ : "memory");
+ *mem += val;
+ __asm__ __volatile__("stb %%g0, [%0]"
+ : /* no outputs */
+ : "r" (&lock)
+ : "memory");
+}
+
+static int
+__attribute__ ((unused))
+compare_and_swap (volatile long int *p, long int oldval, long int newval)
+{
+ static unsigned char lock;
+ int ret, tmp;
+
+ __asm__ __volatile__("1: ldstub [%1], %0\n\t"
+ " cmp %0, 0\n\t"
+ " bne 1b\n\t"
+ " nop"
+ : "=&r" (tmp)
+ : "r" (&lock)
+ : "memory");
+ if (*p != oldval)
+ ret = 0;
+ else
+ {
+ *p = newval;
+ ret = 1;
+ }
+ __asm__ __volatile__("stb %%g0, [%0]"
+ : /* no outputs */
+ : "r" (&lock)
+ : "memory");
+
+ return ret;
+}
+
+#endif /* atomicity.h */