pt-machine.h 2.1 KB

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  1. /* Machine-dependent pthreads configuration and inline functions.
  2. ARM version.
  3. Copyright (C) 1997, 1998, 2000, 2002 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 not,
  16. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17. Boston, MA 02111-1307, USA. */
  18. #ifndef _PT_MACHINE_H
  19. #define _PT_MACHINE_H 1
  20. #include <features.h>
  21. #ifndef PT_EI
  22. # define PT_EI __extern_always_inline
  23. #endif
  24. /* This will not work on ARM1 or ARM2 because SWP is lacking on those
  25. machines. Unfortunately we have no way to detect this at compile
  26. time; let's hope nobody tries to use one. */
  27. /* Spinlock implementation; required. */
  28. PT_EI long int testandset (int *spinlock);
  29. PT_EI long int testandset (int *spinlock)
  30. {
  31. register unsigned int ret;
  32. #if defined(__thumb__)
  33. void *pc;
  34. __asm__ __volatile__(
  35. ".align 0\n"
  36. "\tbx pc\n"
  37. "\tnop\n"
  38. "\t.arm\n"
  39. "\tswp %0, %2, [%3]\n"
  40. "\torr %1, pc, #1\n"
  41. "\tbx %1\n"
  42. "\t.force_thumb"
  43. : "=r"(ret), "=r"(pc)
  44. : "0"(1), "r"(spinlock));
  45. #else
  46. __asm__ __volatile__("swp %0, %1, [%2]"
  47. : "=r"(ret)
  48. : "0"(1), "r"(spinlock));
  49. #endif
  50. return ret;
  51. }
  52. /* Get some notion of the current stack. Need not be exactly the top
  53. of the stack, just something somewhere in the current frame. */
  54. #define CURRENT_STACK_FRAME stack_pointer
  55. register char * stack_pointer __asm__ ("sp");
  56. #endif /* pt-machine.h */