pt-machine.h 1.7 KB

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  1. /* Machine-dependent pthreads configuration and inline functions.
  2. ARM version.
  3. Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
  4. This file is part of the GNU C Library.
  5. Contributed by Philip Blundell <philb@gnu.org>.
  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, see <http://www.gnu.org/licenses/>. */
  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. /* This will not work on ARM1 or ARM2 because SWP is lacking on those
  24. machines. Unfortunately we have no way to detect this at compile
  25. time; let's hope nobody tries to use one. */
  26. /* Spinlock implementation; required. */
  27. PT_EI long int
  28. testandset (int *spinlock)
  29. {
  30. register unsigned int ret;
  31. __asm__ __volatile__("swp %0, %1, [%2]"
  32. : "=r"(ret)
  33. : "0"(1), "r"(spinlock));
  34. return ret;
  35. }
  36. /* Get some notion of the current stack. Need not be exactly the top
  37. of the stack, just something somewhere in the current frame. */
  38. #define CURRENT_STACK_FRAME stack_pointer
  39. register char * stack_pointer __asm__ ("sp");
  40. #endif /* pt-machine.h */