pt-machine.h 2.2 KB

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  1. /* Machine-dependent pthreads configuration and inline functions.
  2. m68k version.
  3. Copyright (C) 1996, 1998, 2000, 2002 Free Software Foundation, Inc.
  4. This file is part of the GNU C Library.
  5. Contributed by Richard Henderson <rth@tamu.edu>.
  6. The GNU C Library is free software; you can redistribute it and/or
  7. modify it under the terms of the GNU Lesser General Public License as
  8. published by the Free Software Foundation; either version 2.1 of the
  9. License, or (at your option) any later version.
  10. The GNU C Library is distributed in the hope that it will be useful,
  11. but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13. Lesser General Public License for more details.
  14. You should have received a copy of the GNU Lesser General Public
  15. License along with the GNU C Library; see the file COPYING.LIB. If
  16. not, write to the Free Software Foundation, Inc.,
  17. 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
  18. #ifndef _PT_MACHINE_H
  19. #define _PT_MACHINE_H 1
  20. #ifndef PT_EI
  21. # define PT_EI extern inline
  22. #endif
  23. extern long int testandset (int *spinlock);
  24. extern int __compare_and_swap (long int *p, long int oldval, long int newval);
  25. /* Spinlock implementation; required. */
  26. PT_EI long int
  27. testandset (int *spinlock)
  28. {
  29. char ret;
  30. __asm__ __volatile__(
  31. #if !defined(__mcoldfire__) && !defined(__mcf5200__) && !defined(__m68000)
  32. "tas %1; sne %0"
  33. #else
  34. "bset #7,%1; sne %0"
  35. #endif
  36. : "=dm"(ret), "=m"(*spinlock)
  37. : "m"(*spinlock)
  38. : "cc");
  39. return ret;
  40. }
  41. /* Get some notion of the current stack. Need not be exactly the top
  42. of the stack, just something somewhere in the current frame. */
  43. #define CURRENT_STACK_FRAME stack_pointer
  44. register char * stack_pointer __asm__ ("%sp");
  45. /* Compare-and-swap for semaphores. */
  46. #if !defined(__mcoldfire__) && !defined(__mcf5200__) && !defined(__mc68000)
  47. #define HAS_COMPARE_AND_SWAP
  48. PT_EI int
  49. __compare_and_swap (long int *p, long int oldval, long int newval)
  50. {
  51. char ret;
  52. long int readval;
  53. __asm__ __volatile__ ("casl %2, %3, %1; seq %0"
  54. : "=dm" (ret), "=m" (*p), "=d" (readval)
  55. : "d" (newval), "m" (*p), "2" (oldval));
  56. return ret;
  57. }
  58. #endif
  59. #endif /* pt-machine.h */