Home Explore Help
Sign In
oss
/
uclibc-ng
4
1
Fork 0
Files Issues 3 Pull Requests 0 Wiki
Tree: ffb96c0900
Branches Tags
uclibc-ng
/
libc
/
sysdeps
/
linux
/
i386
/
setjmp.S

setjmp.S 2.1 KB
History Raw

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859 
  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. #include <sysdep.h>
    21. 

  21. #define _ASM
    22. 

  22. #define _SETJMP_H
    23. 

  23. #include <bits/setjmp.h>
    24. 

  24. 

  25. ENTRY (__setjmp)
    26. 

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

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

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

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

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

  31. 

  32. ENTRY (__sigsetjmp)
    33. 

  33. 	movl 4(%esp), %eax	/* User's jmp_buf in %eax.  */
    34. 

  34.      	/* Save registers.  */
    35. 

  35. 	movl %ebx, (JB_BX*4)(%eax)
    36. 

  36. 	movl %esi, (JB_SI*4)(%eax)
    37. 

  37. 	movl %edi, (JB_DI*4)(%eax)
    38. 

  38. 	movl %ebp, (JB_BP*4)(%eax)
    39. 

  39. 	leal 4(%esp), %ecx	/* Save SP as it will be after we return.  */
    40. 

  40.      	movl %ecx, (JB_SP*4)(%eax)
    41. 

  41. 	movl 0(%esp), %ecx	/* Save PC we are returning to now.  */
    42. 

  42.      	movl %ecx, (JB_PC*4)(%eax)
    43. 

  43. 

  44. 	/* Make a tail call to __sigjmp_save; it takes the same args.  */
    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 L(here)
    51. 

  51. L(here):
    52. 

  52. 	popl %ecx
    53. 

  53. 	addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ecx
    54. 

  54. 	movl C_SYMBOL_NAME(__sigjmp_save@GOT)(%ecx), %ecx
    55. 

  55. 	jmp *%ecx
    56. 

  56. #else
    57. 

  57. 	jmp __sigjmp_save
    58. 

  58. #endif
    59. 

  59. .size __sigsetjmp,.-__sigsetjmp;
    60.