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bsd-setjmp.S

bsd-setjmp.S 2.0 KB
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  1. /* BSD `setjmp' entry point to `sigsetjmp (..., 1)'.  i386 version.
    2. 

  2.    Copyright (C) 1995, 1996, 1997, 2000, 2001 Free Software Foundation, Inc.
    3. 

  3.    This file is part of the GNU C Library.
    4. 

  4. 

  5.    The GNU C Library is free software; you can redistribute it and/or
    6. 

  6.    modify it under the terms of the GNU Lesser General Public
    7. 

  7.    License as published by the Free Software Foundation; either
    8. 

  8.    version 2.1 of the License, or (at your option) any later version.
    9. 

  9. 

  10.    The GNU C Library is distributed in the hope that it will be useful,
    11. 

  11.    but WITHOUT ANY WARRANTY; without even the implied warranty of
    12. 

  12.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13. 

  13.    Lesser General Public License for more details.
    14. 

  14. 

  15.    You should have received a copy of the GNU Lesser General Public
    16. 

  16.    License along with the GNU C Library; if not, write to the Free
    17. 

  17.    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    18. 

  18.    02111-1307 USA.  */
    19. 

  19. 

  20. #define _ASM
    21. 

  21. #define _SETJMP_H
    22. 

  22. #include <bits/setjmp.h>
    23. 

  23. 

  24. .globl setjmp;
    25. 

  25. .type    setjmp,@function
    26. 

  26. .align 4;
    27. 

  27. setjmp:
    28. 

  28.         movl 4   (%esp), %eax
    29. 

  29. 	/* Save registers.  */
    30. 

  30.         movl %ebx, (0 *4)(%eax)
    31. 

  31.         movl %esi, (1 *4)(%eax)
    32. 

  32.         movl %edi, (2 *4)(%eax)
    33. 

  33. 	/* Save SP as it will be after we return.  */
    34. 

  34.         leal 4   (%esp), %ecx
    35. 

  35.         movl %ecx, (4 *4)(%eax)
    36. 

  36. 	/* Save PC we are returning to now.  */
    37. 

  37.         movl 0 (%esp), %ecx
    38. 

  38.         movl %ecx, (5 *4)(%eax)
    39. 

  39. 	/* Save caller's frame pointer.  */
    40. 

  40.         movl %ebp, (3 *4)(%eax)  
    41. 

  41. 

  42. 	/* Call __sigjmp_save.  */
    43. 

  43. 	pushl $1
    44. 

  44. 	pushl 8(%esp)
    45. 

  45. #ifdef	PIC
    46. 

  46. 	/* We cannot use the PLT, because it requires that %ebx be set, but
    47. 

  47.            we can't save and restore our caller's value.  Instead, we do an
    48. 

  48.            indirect jump through the GOT, using for the temporary register
    49. 

  49.            %ecx, which is call-clobbered.  */
    50. 

  50. 	call here2
    51. 

  51. here2:	popl %ecx
    52. 

  52. 	addl $_GLOBAL_OFFSET_TABLE_+[.-here2], %ecx
    53. 

  53. 	movl    __sigjmp_save    @GOT  (%ecx), %ecx
    54. 

  54. 	call *%ecx
    55. 

  55. #else
    56. 

  56. 	call __sigjmp_save
    57. 

  57. #endif
    58. 

  58. 	popl %ecx
    59. 

  59. 	popl %edx
    60. 

  60. 	ret
    61. 

  61. .size setjmp,.-setjmp;
    62.