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clone.S

clone.S 2.2 KB
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  1. /* Copyright (C) 2001 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 Library General Public License as
    6. 

  6.    published by the Free Software Foundation; either version 2 of the
    7. 

  7.    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.    Library General Public License for more details.
    13. 

  13. 

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

  15.    License along with the GNU C Library; see the file COPYING.LIB.  If not,
    16. 

  16.    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    17. 

  17.    Boston, MA 02111-1307, USA.  */
    18. 

  18. 

  19. #include <asm/errno.h>
    20. 

  20. #include <sys/syscall.h>
    21. 

  21. #include <sysdep.h>
    22. 

  22. 

  23. /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
    24. 

  24. 

  25. 	.syntax no_register_prefix
    26. 

  26. 

  27.         .text
    28. 

  28. ENTRY (__clone)
    29. 

  29. 	/* Sanity check arguments: No NULL function pointers.  Allow a NULL
    30. 

  30. 	   stack pointer though; it makes the kernel allocate stack.  */
    31. 

  31. 	test.d	r10
    32. 

  32. 	beq	1f
    33. 

  33. 	nop
    34. 

  34. 

  35. 	/* We need to muck with a few registers.  */
    36. 

  36. 	movem	r1,[sp=sp-8]
    37. 

  37. 

  38. 	/* Save the function pointer and argument.  We can't save them
    39. 

  39. 	   onto the new stack since it can be NULL.  */
    40. 

  40. 	move.d	r10,r0
    41. 

  41. 	move.d	r13,r1
    42. 

  42. 

  43.         /* Move the other arguments into place for the system call.  */
    44. 

  44. 	move.d	r11,r10
    45. 

  45. 	move.d	r12,r11
    46. 

  46. 

  47. 	/* Do the system call.  */
    48. 

  48. 	movu.w	SYS_ify (clone),r9
    49. 

  49. 	break	13
    50. 

  50. 	test.d	r10
    51. 

  51. 	beq	.Lthread_start
    52. 

  52. 	nop
    53. 

  53. 

  54. 	/* Jump to error handler if we get (unsigned) -4096 .. 0xffffffff.  */
    55. 

  55. 	cmps.w	-4096,r10
    56. 

  56. 	bhs	0f
    57. 

  57. 	movem	[sp+],r1
    58. 

  58. 

  59. 	/* In parent, successful return.  (Avoid using "ret" - it's a macro.)  */
    60. 

  60. 	Ret
    61. 

  61. 	nop
    62. 

  62. 

  63. .Lthread_start:
    64. 

  64. 	/* Terminate frame pointers here.  */
    65. 

  65. 	moveq	0,r8
    66. 

  66. 

  67. 	/* I've told you once.  */
    68. 

  68. 	move.d	r1,r10
    69. 

  69. 	jsr	r0
    70. 

  70. 

  71. 	SETUP_PIC
    72. 

  72. 	PLTCALL	(_exit)
    73. 

  73. 

  74. 	/* Die horribly.  */
    75. 

  75. 	test.d	[6809]
    76. 

  76. 

  77. 	/* Stop the unstoppable.  */
    78. 

  78. 9:
    79. 

  79. 	ba	9b
    80. 

  80. 	nop
    81. 

  81. 

  82. /* Local error handler.  */
    83. 

  83. 1:
    84. 

  84. 	movs.w	-EINVAL,r10
    85. 

  85. 	/* Drop through into the ordinary error handler.  */
    86. 

  86. PSEUDO_END (__clone)
    87. 

  87. 

  88. .globl clone
    89. 

  89. 	clone = __clone
    90.