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vfork.S

vfork.S 2.1 KB
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  1. /* Copyright (C) 2003 Free Software Foundation, Inc.
    2. 

  2.    This file is part of the GNU C Library.
    3. 

  3. 

  4.    The GNU C Library is free software; you can redistribute it and/or
    5. 

  5.    modify it under the terms of the GNU Lesser General Public
    6. 

  6.    License as published by the Free Software Foundation; either
    7. 

  7.    version 2.1 of the License, or (at your option) any later version.
    8. 

  8. 

  9.    The GNU C Library is distributed in the hope that it will be useful,
    10. 

  10.    but WITHOUT ANY WARRANTY; without even the implied warranty of
    11. 

  11.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    12. 

  12.    Lesser General Public License for more details.
    13. 

  13. 

  14.    You should have received a copy of the GNU Lesser General Public
    15. 

  15.    License along with the GNU C Library; if not, see
    16. 

  16.    <http://www.gnu.org/licenses/>.  */
    17. 

  17. 

  18. #include <sysdep-cancel.h>
    19. 

  19. #define _ERRNO_H	1
    20. 

  20. #include <bits/errno.h>
    21. 

  21. #include <bits/kernel-features.h>
    22. 

  22. 

  23. /* Clone the calling process, but without copying the whole address space.
    24. 

  24.    The calling process is suspended until the new process exits or is
    25. 

  25.    replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
    26. 

  26.    and the process ID of the new process to the old process.  */
    27. 

  27. 

  28. ENTRY (__vfork)
    29. 

  29. 

  30. #ifdef __NR_vfork
    31. 

  31. # ifdef SHARED
    32. 

  32. 	mflr	9
    33. 

  33. #  ifdef HAVE_ASM_PPC_REL16
    34. 

  34. 	bcl	20,31,1f
    35. 

  35. 1:	mflr	10
    36. 

  36. 	addis	10,10,__libc_pthread_functions-1b@ha
    37. 

  37. 	lwz	10,__libc_pthread_functions-1b@l(10)
    38. 

  38. 	mtlr	9
    39. 

  39. #  else
    40. 

  40. 	bl	_GLOBAL_OFFSET_TABLE_@local-4
    41. 

  41. 	mflr	10
    42. 

  42. 	mtlr	9
    43. 

  43. 	lwz	10,__libc_pthread_functions@got(10)
    44. 

  44. 	lwz	10,0(10)
    45. 

  45. #  endif
    46. 

  46. # else
    47. 

  47. 	.weak	pthread_create
    48. 

  48. 	lis	10,pthread_create@ha
    49. 

  49. 	la	10,pthread_create@l(10)
    50. 

  50. # endif
    51. 

  51. 

  52. 	cmpwi	10,0
    53. 

  53. 	bne-	.Lhidden_fork
    54. 

  54. 

  55. 	DO_CALL (SYS_ify (vfork));
    56. 

  56. 

  57. # ifdef __ASSUME_VFORK_SYSCALL
    58. 

  58. 	PSEUDO_RET
    59. 

  59. # else
    60. 

  60. 	bnslr+
    61. 

  61. 	/* Check if vfork syscall is known at all.  */
    62. 

  62. 	cmpwi	r3,ENOSYS
    63. 

  63. 	bne-	.Lsyscall_error
    64. 

  64. 

  65. # endif
    66. 

  66. 

  67. .Lhidden_fork:
    68. 

  68. 	b	HIDDEN_JUMPTARGET(fork)
    69. 

  69. 

  70. #endif
    71. 

  71. 

  72. #ifndef __ASSUME_VFORK_SYSCALL
    73. 

  73. 	/* If we don't have vfork, fork is close enough.  */
    74. 

  74. 

  75. 	DO_CALL (SYS_ify (fork));
    76. 

  76. 	bnslr+
    77. 

  77. 

  78. .Lsyscall_error:
    79. 

  79. 	b	__syscall_error@local
    80. 

  80. #endif
    81. 

  81. 

  82. PSEUDO_END (__vfork)
    83. 

  83. libc_hidden_def (__vfork)
    84. 

  84. 

  85. weak_alias (__vfork, vfork)
    86.