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

http://github.com/feyeleanor/RubyGoLightly · C++ Header · 46 lines · 12 code · 8 blank · 26 comment · 0 complexity · 5ab1b83f7147e1b8c5fe69035ab428d2 MD5 · raw file 

    

  1. /* 
    2. 

  2.  * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
    3. 

  3.  * Copyright (c) 1996-1999 by Silicon Graphics.  All rights reserved.
    4. 

  4.  * Copyright (c) 1999-2003 by Hewlett-Packard Company. All rights reserved.
    5. 

  5.  *
    6. 

  6.  *
    7. 

  7.  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
    8. 

  8.  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
    9. 

  9.  *
    10. 

  10.  * Permission is hereby granted to use or copy this program
    11. 

  11.  * for any purpose,  provided the above notices are retained on all copies.
    12. 

  12.  * Permission to modify the code and to distribute modified code is granted,
    13. 

  13.  * provided the above notices are retained, and a notice that the code was
    14. 

  14.  * modified is included with the above copyright notice.
    15. 

  15.  *
    16. 

  16.  */
    17. 

  17. 

  18. /* FIXME.  Very incomplete.  No support for sparc64.	*/
    19. 

  19. /* Non-ancient SPARCs provide compare-and-swap (casa).	*/
    20. 

  20. /* We should make that available.			*/
    21. 

  21. 

  22. #include "../all_atomic_load_store.h"
    23. 

  23. 

  24. /* Real SPARC code uses TSO:				*/
    25. 

  25. #include "../ordered_except_wr.h"
    26. 

  26. 

  27. /* Test_and_set location is just a byte.                */
    28. 

  28. #include "../test_and_set_t_is_char.h"
    29. 

  29. 

  30. AO_INLINE AO_TS_VAL_t
    31. 

  31. AO_test_and_set_full(volatile AO_TS_t *addr) {
    32. 

  32.   int oldval;
    33. 

  33. 

  34.    __asm__ __volatile__("ldstub %1,%0"
    35. 

  35. 	                : "=r"(oldval), "=m"(*addr)
    36. 

  36. 	                : "m"(*addr) : "memory");
    37. 

  37.    return oldval;
    38. 

  38. }
    39. 

  39. 

  40. #define AO_HAVE_test_and_set_full
    41. 

  41. 

  42. /* FIXME: This needs to be extended for SPARC v8 and v9.	*/
    43. 

  43. /* SPARC V8 also has swap.  V9 has CAS.				*/
    44. 

  44. /* There are barriers like membar #LoadStore.			*/
    45. 

  45. /* CASA (32-bit) and CASXA(64-bit) instructions were		*/
    46. 

  46. /* added in V9.							*/
    47.