gnu_tls.h 3.5 KB

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  1. /*
  2. * Copyright (C) 2011-2016 Intel Corporation. All rights reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions
  6. * are met:
  7. *
  8. * * Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * * Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in
  12. * the documentation and/or other materials provided with the
  13. * distribution.
  14. * * Neither the name of Intel Corporation nor the names of its
  15. * contributors may be used to endorse or promote products derived
  16. * from this software without specific prior written permission.
  17. *
  18. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21. * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22. * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25. * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26. * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29. *
  30. */
  31. #ifndef GNU_TLS_H__
  32. #define GNU_TLS_H__
  33. #include <stddef.h>
  34. /* Type for the dtv. */
  35. typedef union
  36. {
  37. size_t counter;
  38. struct
  39. {
  40. void *val;
  41. int is_static;
  42. } pointer;
  43. } dtv_t;
  44. typedef struct
  45. {
  46. void *tcb; /* Pointer to the TCB. Not necessarily the
  47. thread descriptor used by libpthread. */
  48. dtv_t *dtv;
  49. void *self; /* Pointer to the thread descriptor. */
  50. /* We are not interested in the other fields. */
  51. } tcbhead_t;
  52. /* ------------------------------------------------------------ */
  53. #if defined(__amd64) || defined(__amd64__) || defined (__x86_64)
  54. /* x86_64 uses %fs as the thread register */
  55. #define GET_DTV() \
  56. ({ dtv_t* __dtv; \
  57. asm ("mov %%fs:%c1, %0" : "=r"(__dtv) \
  58. : "i" (offsetof (tcbhead_t, dtv))); \
  59. __dtv; })
  60. #define GET_FS_GS_0() \
  61. ({ uintptr_t __orig; \
  62. asm volatile ("mov %%fs:0x0, %0" : "=r"(__orig)); \
  63. __orig; })
  64. #define SET_FS_GS_0(val) \
  65. ({ asm volatile ("mov %0, %%fs:0x0" : :"r"(val));})
  66. #elif defined(__i386) || defined(__i386__)
  67. /* IA32 uses %gs as the thread register */
  68. #define GET_DTV() \
  69. ({ dtv_t* __dtv; \
  70. asm ("mov %%gs:%c1, %0" : "=r"(__dtv) \
  71. : "i" (offsetof (tcbhead_t, dtv))); \
  72. __dtv; })
  73. #define GET_FS_GS_0() \
  74. ({ uintptr_t __orig; \
  75. asm volatile ("mov %%gs:0x0, %0" : "=r"(__orig)); \
  76. __orig; })
  77. #define SET_FS_GS_0(val) \
  78. ({ asm volatile ("mov %0, %%gs:0x0" : :"r"(val));})
  79. #endif
  80. #define read_dtv_val(dtv) (dtv->pointer.val)
  81. #define set_dtv_val(dtv, v) \
  82. do { dtv->pointer.val = (void*)(size_t)v; } while (0)
  83. #endif /* !GNU_TLS_H__ */