/vendor/gc/libatomic_ops-1.2/src/atomic_ops/sysdeps/gcc/sparc.h

 1/* 
 2 * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
 3 * Copyright (c) 1996-1999 by Silicon Graphics.  All rights reserved.
 4 * Copyright (c) 1999-2003 by Hewlett-Packard Company. All rights reserved.
 5 *
 6 *
 7 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
 8 * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
 9 *
10 * Permission is hereby granted to use or copy this program
11 * for any purpose,  provided the above notices are retained on all copies.
12 * Permission to modify the code and to distribute modified code is granted,
13 * provided the above notices are retained, and a notice that the code was
14 * modified is included with the above copyright notice.
15 *
16 */
17
18/* FIXME.  Very incomplete.  No support for sparc64.	*/
19/* Non-ancient SPARCs provide compare-and-swap (casa).	*/
20/* We should make that available.			*/
21
22#include "../all_atomic_load_store.h"
23
24/* Real SPARC code uses TSO:				*/
25#include "../ordered_except_wr.h"
26
27/* Test_and_set location is just a byte.                */
28#include "../test_and_set_t_is_char.h"
29
30AO_INLINE AO_TS_VAL_t
31AO_test_and_set_full(volatile AO_TS_t *addr) {
32  int oldval;
33
34   __asm__ __volatile__("ldstub %1,%0"
35	                : "=r"(oldval), "=m"(*addr)
36	                : "m"(*addr) : "memory");
37   return oldval;
38}
39
40#define AO_HAVE_test_and_set_full
41
42/* FIXME: This needs to be extended for SPARC v8 and v9.	*/
43/* SPARC V8 also has swap.  V9 has CAS.				*/
44/* There are barriers like membar #LoadStore.			*/
45/* CASA (32-bit) and CASXA(64-bit) instructions were		*/
46/* added in V9.							*/