pt-machine.h 2.9 KB

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  1. /* Machine-dependent pthreads configuration and inline functions.
  2. Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003, 2004
  3. Free Software Foundation, Inc.
  4. This file is part of the GNU C Library.
  5. Contributed by Ralf Baechle <ralf@gnu.org>.
  6. Based on the Alpha version by Richard Henderson <rth@tamu.edu>.
  7. The GNU C Library is free software; you can redistribute it and/or
  8. modify it under the terms of the GNU Lesser General Public License as
  9. published by the Free Software Foundation; either version 2.1 of the
  10. License, or (at your option) any later version.
  11. The GNU C Library is distributed in the hope that it will be useful,
  12. but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14. Lesser General Public License for more details.
  15. You should have received a copy of the GNU Lesser General Public
  16. License along with the GNU C Library; see the file COPYING.LIB. If
  17. not, write to the Free Software Foundation, Inc.,
  18. 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
  19. #ifndef _PT_MACHINE_H
  20. #define _PT_MACHINE_H 1
  21. #include <features.h>
  22. /* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
  23. This file is part of the GNU C Library.
  24. Contributed by Maciej W. Rozycki <macro@ds2.pg.gda.pl>, 2000. */
  25. static inline int
  26. __NTH (_test_and_set (int *p, int v))
  27. {
  28. int r, t;
  29. __asm__ __volatile__
  30. ("/* Inline test and set */\n"
  31. "1:\n\t"
  32. ".set push\n\t"
  33. ".set mips2\n\t"
  34. "ll %0,%3\n\t"
  35. "move %1,%4\n\t"
  36. "beq %0,%4,2f\n\t"
  37. "sc %1,%2\n\t"
  38. ".set pop\n\t"
  39. "beqz %1,1b\n"
  40. "2:\n\t"
  41. "/* End test and set */"
  42. : "=&r" (r), "=&r" (t), "=m" (*p)
  43. : "m" (*p), "r" (v)
  44. : "memory");
  45. return r;
  46. }
  47. #ifndef PT_EI
  48. # define PT_EI extern inline __attribute__ ((always_inline))
  49. #endif
  50. extern long int testandset (int *spinlock);
  51. extern int __compare_and_swap (long int *p, long int oldval, long int newval);
  52. /* Spinlock implementation; required. */
  53. PT_EI long int
  54. testandset (int *spinlock)
  55. {
  56. return _test_and_set (spinlock, 1);
  57. }
  58. /* Get some notion of the current stack. Need not be exactly the top
  59. of the stack, just something somewhere in the current frame. */
  60. #define CURRENT_STACK_FRAME stack_pointer
  61. register char * stack_pointer __asm__ ("$29");
  62. /* Compare-and-swap for semaphores. */
  63. #define HAS_COMPARE_AND_SWAP
  64. PT_EI int
  65. __compare_and_swap (long int *p, long int oldval, long int newval)
  66. {
  67. long int ret, temp;
  68. __asm__ __volatile__
  69. ("/* Inline compare & swap */\n"
  70. "1:\n\t"
  71. ".set push\n\t"
  72. ".set mips2\n\t"
  73. "ll %1,%5\n\t"
  74. "move %0,$0\n\t"
  75. "bne %1,%3,2f\n\t"
  76. "move %0,%4\n\t"
  77. "sc %0,%2\n\t"
  78. ".set pop\n\t"
  79. "beqz %0,1b\n"
  80. "2:\n\t"
  81. "/* End compare & swap */"
  82. : "=&r" (ret), "=&r" (temp), "=m" (*p)
  83. : "r" (oldval), "r" (newval), "m" (*p)
  84. : "memory");
  85. return ret;
  86. }
  87. #endif /* pt-machine.h */