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vfork.S

vfork.S 2.2 KB
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  1. /* Copyright (C) 1999, 2002, 2003, 2005 Free Software Foundation, Inc.
    2. 

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

  3.    Contributed by Philip Blundell <philb@gnu.org>.
    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 Lesser General Public
    7. 

  7.    License as published by the Free Software Foundation; either
    8. 

  8.    version 2.1 of the 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.    Lesser General Public License for more details.
    14. 

  14. 

  15.    You should have received a copy of the GNU Lesser General Public
    16. 

  16.    License along with the GNU C Library; if not, write to the Free
    17. 

  17.    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    18. 

  18.    02111-1307 USA.  */
    19. 

  19. 

  20. #include <sysdep-cancel.h>
    21. 

  21. #define _ERRNO_H	1
    22. 

  22. #include <bits/errno.h>
    23. 

  23. #include <kernel-features.h>
    24. 

  24. 

  25. /* Clone the calling process, but without copying the whole address space.
    26. 

  26.    The calling process is suspended until the new process exits or is
    27. 

  27.    replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
    28. 

  28.    and the process ID of the new process to the old process.  */
    29. 

  29. 

  30. ENTRY (__vfork)
    31. 

  31. 

  32. #ifdef __NR_vfork
    33. 

  33. 

  34. #ifdef SHARED
    35. 

  35. 	ldr	ip, 1f
    36. 

  36. 	ldr	r0, 2f
    37. 

  37. 3:	add	ip, pc, ip
    38. 

  38. 	ldr	r0, [ip, r0]
    39. 

  39. #else
    40. 

  40. 	ldr	r0, 1f
    41. 

  41. #endif
    42. 

  42. 	movs	r0, r0
    43. 

  43. 	bne	HIDDEN_JUMPTARGET (__fork)
    44. 

  44. 

  45. 	DO_CALL (vfork, 0)
    46. 

  46. 	cmn	a1, #4096
    47. 

  47. 	RETINSTR(cc, lr)
    48. 

  48. 

  49. #ifndef __ASSUME_VFORK_SYSCALL
    50. 

  50. 	/* Check if vfork syscall is known at all.  */
    51. 

  51. 	cmn	a1, #ENOSYS
    52. 

  52. 	bne	PLTJMP(C_SYMBOL_NAME(__syscall_error))
    53. 

  53. #endif
    54. 

  54. 

  55. #endif
    56. 

  56. 

  57. #ifndef __ASSUME_VFORK_SYSCALL
    58. 

  58. 	/* If we don't have vfork, fork is close enough.  */
    59. 

  59. 	DO_CALL (fork, 0)
    60. 

  60. 	cmn	a1, #4096
    61. 

  61. 	RETINSTR(cc, lr)
    62. 

  62. #elif !defined __NR_vfork
    63. 

  63. # error "__NR_vfork not available and __ASSUME_VFORK_SYSCALL defined"
    64. 

  64. #endif
    65. 

  65.     	b	PLTJMP(C_SYMBOL_NAME(__syscall_error))
    66. 

  66. 

  67. #ifdef SHARED
    68. 

  68. 1:	.word	_GLOBAL_OFFSET_TABLE_ - 3b - 8
    69. 

  69. 2:	.word	__libc_pthread_functions(GOTOFF)
    70. 

  70. #else
    71. 

  71. 	.weak	pthread_create
    72. 

  72. 1:	.word	pthread_create
    73. 

  73. #endif
    74. 

  74. 

  75. PSEUDO_END (__vfork)
    76. 

  76. libc_hidden_def (__vfork)
    77. 

  77. 

  78. weak_alias (__vfork, vfork)
    79.