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libc
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sysdeps
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linux
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nios
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vfork.S

vfork.S 1.0 KB
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  1. /*
    2. 

  2.  * libc/sysdeps/linux/nios/vfork.S -- `vfork' syscall for linux/nios
    3. 

  3.  *
    4. 

  4.  *  Copyright (C) 2004  Microtronix Datacom Ltd
    5. 

  5.  *
    6. 

  6.  * This file is subject to the terms and conditions of the GNU Lesser
    7. 

  7.  * General Public License.  See the file COPYING.LIB in the main
    8. 

  8.  * directory of this archive for more details.
    9. 

  9.  * 
    10. 

  10.  * Written by Wentao Xu <wentao@microtronix.com>
    11. 

  11.  */
    12. 

  12. 

  13. #include <features.h>
    14. 

  14. 

  15. #include <bits/errno.h>
    16. 

  16. #include <sys/syscall.h>
    17. 

  17. #include "NM_Macros.S"
    18. 

  18. 

  19. #ifndef __NR_vfork
    20. 

  20. #define __NR_vfork __NR_fork /* uClinux-2.0 only has fork which is vfork */
    21. 

  21. #endif
    22. 

  22. 

  23.    .text
    24. 

  24.    .align 2
    25. 

  25.    .globl __vfork
    26. 

  26.   .hidden __vfork
    27. 

  27.   .type   __vfork,@function
    28. 

  28. __vfork:
    29. 

  29. 	MOVIP	%g1, __NR_vfork
    30. 

  30. 	trap	63
    31. 

  31. 	
    32. 

  32. 	bgen	%g1, 12
    33. 

  33. 	not		%g1			/* (unsigned long) -4096 */
    34. 

  34. 	cmp		%o0, %g1
    35. 

  35. 	skps	cc_hi
    36. 

  36. 	jmp		%o7
    37. 

  37. 	nop
    38. 

  38. 	
    39. 

  39. fix_errno:
    40. 

  40. 	neg		%o0
    41. 

  41. 	save	%sp, -16
    42. 

  42. 	MOVIA	%g1, __errno_location@h
    43. 

  43. 	call	%g1
    44. 

  44. 	nop
    45. 

  45. 	st	[%o0], %i0		/* store errno */
    46. 

  46. 	
    47. 

  47. 	xor %i0, %i0
    48. 

  48. 	subi %i0, 1		/* retval=-1 */
    49. 

  49. 	ret
    50. 

  50. 	restore
    51. 

  51. 

  52. .size __vfork,.-__vfork
    53. 

  53. weak_alias(__vfork,vfork)
    54. 

  54. libc_hidden_weak(vfork)
    55.