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vfork.S

vfork.S 891 B
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  1. /* vi: set sw=4 ts=4: */
    2. 

  2. /*
    3. 

  3.  * vfork for uClibc
    4. 

  4.  * Copyright (C) 2000-2006 by Erik Andersen <andersen@uclibc.org>
    5. 

  5.  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
    6. 

  6.  */
    7. 

  7. 

  8. #include <features.h>
    9. 

  9. 

  10. #define _ERRNO_H
    11. 

  11. #include <bits/errno.h>
    12. 

  12. #include <sys/syscall.h>
    13. 

  13. 

  14. #ifdef __NR_fork
    15. 

  15. .text
    16. 

  16. .global	__vfork
    17. 

  17. .hidden	__vfork
    18. 

  18. .type	__vfork,%function
    19. 

  19. .align 4
    20. 

  20. 

  21. __vfork:
    22. 

  22. 

  23. #ifdef __NR_vfork
    24. 

  24. 	DO_CALL (vfork)
    25. 

  25. 	cmn	r0, #4096
    26. 

  26. #if defined(__USE_BX__)
    27. 

  27. 	bxcc	lr
    28. 

  28. #else
    29. 

  29. 	movcc	pc, lr
    30. 

  30. #endif
    31. 

  31. 

  32. 	/* Check if vfork even exists.  */
    33. 

  33. 	ldr     r1, =-ENOSYS
    34. 

  34. 	teq     r0, r1
    35. 

  35. 	bne     __error
    36. 

  36. #endif
    37. 

  37. 

  38. 	/* If we don't have vfork, use fork.  */
    39. 

  39. 	DO_CALL (fork)
    40. 

  40. 	cmn     r0, #4096
    41. 

  41. 

  42. 	/* Syscall worked.  Return to child/parent */
    43. 

  43. #if defined(__USE_BX__)
    44. 

  44. 	bxcc	lr
    45. 

  45. #else
    46. 

  46. 	movcc   pc, lr
    47. 

  47. #endif
    48. 

  48. 

  49. __error:
    50. 

  50. 	b	__syscall_error
    51. 

  51. 

  52. .size __vfork,.-__vfork
    53. 

  53. weak_alias(__vfork,vfork)
    54. 

  54. libc_hidden_weak(vfork)
    55. 

  55. #endif
    56.