pt-machine.h 1.8 KB

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  1. /* Machine-dependent pthreads configuration and inline functions.
  2. nios2 version.
  3. Copyright (C) 1996, 1998, 2000, 2002 Free Software Foundation, Inc.
  4. This file is part of the GNU C Library.
  5. The GNU C Library is free software; you can redistribute it and/or
  6. modify it under the terms of the GNU Lesser General Public License as
  7. published by the Free Software Foundation; either version 2.1 of the
  8. License, or (at your option) any later version.
  9. The GNU C Library is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. Lesser General Public License for more details.
  13. You should have received a copy of the GNU Lesser General Public
  14. License along with the GNU C Library; see the file COPYING.LIB. If
  15. not, write to the Free Software Foundation, Inc.,
  16. 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
  17. #ifndef _PT_MACHINE_H
  18. #define _PT_MACHINE_H 1
  19. #include <features.h>
  20. #ifndef PT_EI
  21. # define PT_EI __extern_always_inline
  22. #endif
  23. /* Spinlock implementation; required. */
  24. PT_EI long int
  25. testandset (int *spinlock)
  26. {
  27. unsigned int scratch;
  28. long int ret=-2;
  29. __asm__ __volatile__(
  30. "rdctl %0, status\n\t"
  31. "and %0, %0, %1\n\t"
  32. "wrctl status, %0 #disable interrupts\n\t"
  33. "ldw %1, 0(%4)\n\t"
  34. "stw %3, 0(%4)\n\t"
  35. "ori %0, %0, 1\n\t"
  36. "wrctl status, %0 #enable interrupts\n\t"
  37. : "=&r"(scratch), "=r"(ret)
  38. : "1"(ret), "r"(1), "r"(spinlock)
  39. : "memory");
  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 */