pt-machine.h 1.8 KB

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  1. /* Machine-dependent pthreads configuration and inline functions.
  2. H8/300 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. /* Spinlock implementation; required. */
  25. PT_EI long int
  26. testandset (int *spinlock)
  27. {
  28. char ret;
  29. __asm__ __volatile__(
  30. "sub.w %0,%0\n\t"
  31. "stc ccr,@-sp\n\t"
  32. "orc #0x80,ccr\n\t"
  33. "bld #0,@%2\n\t"
  34. "bset #0,@%2\n\t"
  35. "rotxl.w %0\n\t"
  36. "ldc @sp+,ccr\n\t"
  37. :"=r"(ret),"=m"(*spinlock)
  38. :"g"(spinlock)
  39. :"cc");
  40. return ret;
  41. }
  42. /* Get some notion of the current stack. Need not be exactly the top
  43. of the stack, just something somewhere in the current frame. */
  44. #define CURRENT_STACK_FRAME stack_pointer
  45. register char * stack_pointer __asm__ ("%sp");
  46. #endif /* pt-machine.h */