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vfork.S

vfork.S 961 B
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  1. /*
    2. 

  2.  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
    3. 

  3.  *
    4. 

  4.  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
    5. 

  5.  */
    6. 

  6. 

  7. #include <features.h>
    8. 

  8. 

  9. #include <asm/unistd.h>
    10. 

  10. 

  11. #ifndef __NR_vfork
    12. 

  12. #define __NR_vfork __NR_fork /* uClinux-2.0 only has fork which is vfork */
    13. 

  13. #endif
    14. 

  14. 

  15. #define IMM #
    16. 

  16. 

  17. 	.text
    18. 

  18. 	.align 2
    19. 

  19. 	.globl errno
    20. 

  20. 	.globl	__vfork
    21. 

  21. 	.hidden	__vfork
    22. 

  22. 	.type	__vfork,@function
    23. 

  23. 

  24. __vfork:
    25. 

  25. 	movl	%sp@+, %a1               /* save the return address for later */
    26. 

  26. 	movl	IMM __NR_vfork,%d0
    27. 

  27. 	trap	#0
    28. 

  28. 	movl	IMM -4097, %d1
    29. 

  29. 	cmpl 	%d0, %d1
    30. 

  30. 	bcs     fix_errno
    31. 

  31. 	jmp		%a1@                     /* don't return,  just jmp directly */
    32. 

  32. fix_errno:
    33. 

  33. 	negl	%d0
    34. 

  34. #ifndef __PIC__					/* needs handling as the other archs */
    35. 

  35. 	movl	errno, %a0
    36. 

  36. #else
    37. 

  37. 	movl	errno@GOT(%a5), %a0
    38. 

  38. #endif
    39. 

  39. 	movl	%d0, %a0@
    40. 

  40. 	movl	IMM -1, %d0
    41. 

  41. 	jmp		%a1@                     /* don't return,  just jmp directly */
    42. 

  42. 

  43. .size __vfork,.-__vfork
    44. 

  44. weak_alias(__vfork,vfork)
    45. 

  45. libc_hidden_weak(vfork)
    46.