unwind-resume.c 3.5 KB

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  1. /* Copyright (C) 2003, 2005, 2010 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Jakub Jelinek <jakub@redhat.com>.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public License as
  6. published by the Free Software Foundation; either version 2.1 of the
  7. License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; see the file COPYING.LIB. If not,
  14. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  15. Boston, MA 02111-1307, USA. */
  16. #include <dlfcn.h>
  17. #include <stdio.h>
  18. #include <unwind.h>
  19. #define __libc_dlopen(x) dlopen(x, (RTLD_LOCAL | RTLD_LAZY))
  20. #define __libc_dlsym dlsym
  21. #define __libc_dlclose dlclose
  22. #define __libc_fatal(x) {/*write(STDERR_FILENO, x, strlen(x));*/ abort();}
  23. static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
  24. static _Unwind_Reason_Code (*libgcc_s_personality)
  25. (_Unwind_State, struct _Unwind_Exception *, struct _Unwind_Context *);
  26. static void init (void) __attribute_used__;
  27. static void
  28. init (void)
  29. {
  30. void *resume, *personality;
  31. void *handle;
  32. handle = __libc_dlopen ("libgcc_s.so.1");
  33. if (handle == NULL
  34. || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
  35. || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL)
  36. __libc_fatal ("libgcc_s.so.1 must be installed for pthread_cancel to work\n");
  37. libgcc_s_resume = resume;
  38. libgcc_s_personality = personality;
  39. }
  40. #ifdef __thumb__
  41. void
  42. _Unwind_Resume (struct _Unwind_Exception *exc)
  43. {
  44. if (__builtin_expect (libgcc_s_resume == NULL, 0))
  45. init ();
  46. libgcc_s_resume (exc);
  47. }
  48. #else
  49. /* It's vitally important that _Unwind_Resume not have a stack frame; the
  50. ARM unwinder relies on register state at entrance. So we write this in
  51. assembly. */
  52. __asm__ (
  53. " .globl _Unwind_Resume\n"
  54. " .type _Unwind_Resume, %function\n"
  55. "_Unwind_Resume:\n"
  56. " .cfi_sections .debug_frame\n"
  57. " " CFI_STARTPROC "\n"
  58. " stmfd sp!, {r4, r5, r6, lr}\n"
  59. " " CFI_ADJUST_CFA_OFFSET (16)" \n"
  60. " " CFI_REL_OFFSET (r4, 0) "\n"
  61. " " CFI_REL_OFFSET (r5, 4) "\n"
  62. " " CFI_REL_OFFSET (r6, 8) "\n"
  63. " " CFI_REL_OFFSET (lr, 12) "\n"
  64. " " CFI_REMEMBER_STATE "\n"
  65. " ldr r4, 1f\n"
  66. " ldr r5, 2f\n"
  67. "3: add r4, pc, r4\n"
  68. " ldr r3, [r4, r5]\n"
  69. " mov r6, r0\n"
  70. " cmp r3, #0\n"
  71. " beq 4f\n"
  72. "5: mov r0, r6\n"
  73. " ldmfd sp!, {r4, r5, r6, lr}\n"
  74. " " CFI_ADJUST_CFA_OFFSET (-16) "\n"
  75. " " CFI_RESTORE (r4) "\n"
  76. " " CFI_RESTORE (r5) "\n"
  77. " " CFI_RESTORE (r6) "\n"
  78. " " CFI_RESTORE (lr) "\n"
  79. " bx r3\n"
  80. " " CFI_RESTORE_STATE "\n"
  81. "4: bl init\n"
  82. " ldr r3, [r4, r5]\n"
  83. " b 5b\n"
  84. " " CFI_ENDPROC "\n"
  85. " .align 2\n"
  86. #ifdef __thumb2__
  87. "1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 4\n"
  88. #else
  89. "1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 8\n"
  90. #endif
  91. "2: .word libgcc_s_resume(GOTOFF)\n"
  92. " .size _Unwind_Resume, .-_Unwind_Resume\n"
  93. );
  94. #endif
  95. _Unwind_Reason_Code
  96. __gcc_personality_v0 (_Unwind_State state,
  97. struct _Unwind_Exception *ue_header,
  98. struct _Unwind_Context *context)
  99. {
  100. if (__builtin_expect (libgcc_s_personality == NULL, 0))
  101. init ();
  102. return libgcc_s_personality (state, ue_header, context);
  103. }