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sigrestorer.S

sigrestorer.S 2.0 KB
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  1. /* Copyright (C) 1999 Free Software Foundation, Inc.
    2. 

  2.    This file is part of the GNU C Library.
    3. 

  3. 

  4.    The GNU C Library is free software; you can redistribute it and/or
    5. 

  5.    modify it under the terms of the GNU Lesser General Public
    6. 

  6.    License as published by the Free Software Foundation; either
    7. 

  7.    version 2.1 of the License, or (at your option) any later version.
    8. 

  8. 

  9.    The GNU C Library is distributed in the hope that it will be useful,
    10. 

  10.    but WITHOUT ANY WARRANTY; without even the implied warranty of
    11. 

  11.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    12. 

  12.    Lesser General Public License for more details.
    13. 

  13. 

  14.    You should have received a copy of the GNU Lesser General Public
    15. 

  15.    License along with the GNU C Library; if not, write to the Free
    16. 

  16.    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    17. 

  17.    02111-1307 USA.  */
    18. 

  18. 

  19. #include <sys/syscall.h>
    20. 

  20. 

  21. /* If no SA_RESTORER function was specified by the application we use
    22. 

  22.    one of these.  This avoids the need for the kernel to synthesise a return
    23. 

  23.    instruction on the stack, which would involve expensive cache flushes.
    24. 

  24. 

  25.    Nowadays (2.6 series, and somewhat earlier) the kernel uses a high page
    26. 

  26.    for signal trampolines, so the cache flushes are not an issue.  But since
    27. 

  27.    we do not have a vDSO, continue to use these so that we can provide
    28. 

  28.    unwind information.
    29. 

  29. 

  30.    Start the unwind tables at least one instruction before the signal
    31. 

  31.    trampoline, because the unwinder will assume we are returning after
    32. 

  32.    a call site.  */
    33. 

  33. 

  34. .global __default_sa_restorer
    35. 

  35. .type __default_sa_restorer,%function
    36. 

  36. .align 2
    37. 

  37. #ifdef __ARM_EABI__
    38. 

  38. 	.fnstart
    39. 

  39. 	.save {r0-r15}
    40. 

  40. 	.pad #12
    41. 

  41. 	nop
    42. 

  42. __default_sa_restorer:
    43. 

  43. 	mov	r7, $SYS_ify(sigreturn)
    44. 

  44. 	swi	0x0
    45. 

  45. 	.fnend
    46. 

  46. #else
    47. 

  47. __default_sa_restorer:
    48. 

  48. 	DO_CALL (sigreturn)
    49. 

  49. #endif
    50. 

  50. 

  51. 

  52. #ifdef __NR_rt_sigreturn
    53. 

  53. 

  54. .global __default_rt_sa_restorer
    55. 

  55. .type __default_rt_sa_restorer,%function
    56. 

  56. .align 2
    57. 

  57. #ifdef __ARM_EABI__
    58. 

  58. 	.fnstart
    59. 

  59. 	.save {r0-r15}
    60. 

  60. 	.pad #168
    61. 

  61. 	nop
    62. 

  62. __default_rt_sa_restorer:
    63. 

  63. 	mov	r7, $SYS_ify(rt_sigreturn)
    64. 

  64. 	swi	0x0
    65. 

  65. 	.fnend
    66. 

  66. #else
    67. 

  67. __default_rt_sa_restorer:
    68. 

  68. 	DO_CALL (rt_sigreturn)
    69. 

  69. #endif
    70. 

  70. 

  71. #endif
    72.