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libc
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i386
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setjmp.S

setjmp.S 2.2 KB
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  1. /* setjmp for i386.
    2. 

  2.    Copyright (C) 1995, 1996, 1997 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 Library General Public License as
    7. 

  7.    published by the Free Software Foundation; either version 2 of the
    8. 

  8.    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.    Library General Public License for more details.
    14. 

  14. 

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

  16.    License along with the GNU C Library; see the file COPYING.LIB.  If not,
    17. 

  17.    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    18. 

  18.    Boston, MA 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. .align 4;                                                               \
    26. 

  26. __setjmp:
    27. 

  27. 	popl %eax		/* Pop return address.  */
    28. 

  28. 	popl %ecx		/* Pop jmp_buf.  */
    29. 

  29. 	pushl $0		/* Push zero argument.  */
    30. 

  30. 	pushl %ecx		/* Push jmp_buf.  */
    31. 

  31. 	pushl %eax		/* Push back return address.  */
    32. 

  32. 

  33. .globl __sigsetjmp;
    34. 

  34. .align 4;                                                               \
    35. 

  35. __sigsetjmp:
    36. 

  36. 	movl 4(%esp), %eax	/* User's jmp_buf in %eax.  */
    37. 

  37.      	/* Save registers.  */
    38. 

  38. 	movl %ebx, (JB_BX*4)(%eax)
    39. 

  39. 	movl %esi, (JB_SI*4)(%eax)
    40. 

  40. 	movl %edi, (JB_DI*4)(%eax)
    41. 

  41. 	movl %ebp, (JB_BP*4)(%eax)
    42. 

  42. 	leal 4(%esp), %ecx	/* Save SP as it will be after we return.  */
    43. 

  43.      	movl %ecx, (JB_SP*4)(%eax)
    44. 

  44. 	movl 0(%esp), %ecx	/* Save PC we are returning to now.  */
    45. 

  45.      	movl %ecx, (JB_PC*4)(%eax)
    46. 

  46. 

  47. 	/* Make a tail call to __sigjmp_save; it takes the same args.  */
    48. 

  48. #ifdef	PIC
    49. 

  49. 	/* We cannot use the PLT, because it requires that %ebx be set, but
    50. 

  50.            we can't save and restore our caller's value.  Instead, we do an
    51. 

  51.            indirect jump through the GOT, using for the temporary register
    52. 

  52.            %ecx, which is call-clobbered.  */
    53. 

  53. 	call L(here)
    54. 

  54. L(here):
    55. 

  55. 	popl %ecx
    56. 

  56. 	addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ecx
    57. 

  57. 	movl (__sigjmp_save)(%ecx), %ecx
    58. 

  58. 	jmp *%ecx
    59. 

  59. #else
    60. 

  60. 	jmp __sigjmp_save
    61. 

  61. #endif
    62. 

  62. .size __sigsetjmp,.-__sigsetjmp;
    63.