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copy_in_user.S

copy_in_user.S 1.9 KB
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  1. /* copy_in_user.S: Copy from userspace to userspace.
    2. 

  2.  *
    3. 

  3.  * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com)
    4. 

  4.  */
    5. 

  5. 

  6. #include <linux/linkage.h>
    7. 

  7. #include <asm/asi.h>
    8. 

  8. 

  9. #define XCC xcc
    10. 

  10. 

  11. #define EX(x,y,z)		\
    12. 

  12. 98:	x,y;			\
    13. 

  13. 	.section __ex_table,"a";\
    14. 

  14. 	.align 4;		\
    15. 

  15. 	.word 98b, z;		\
    16. 

  16. 	.text;			\
    17. 

  17. 	.align 4;
    18. 

  18. 

  19. #define EX_O4(x,y) EX(x,y,__retl_o4_plus_8)
    20. 

  20. #define EX_O2_4(x,y) EX(x,y,__retl_o2_plus_4)
    21. 

  21. #define EX_O2_1(x,y) EX(x,y,__retl_o2_plus_1)
    22. 

  22. 

  23. 	.register	%g2,#scratch
    24. 

  24. 	.register	%g3,#scratch
    25. 

  25. 

  26. 	.text
    27. 

  27. __retl_o4_plus_8:
    28. 

  28. 	add	%o4, %o2, %o4
    29. 

  29. 	retl
    30. 

  30. 	 add	%o4, 8, %o0
    31. 

  31. __retl_o2_plus_4:
    32. 

  32. 	retl
    33. 

  33. 	 add	%o2, 4, %o0
    34. 

  34. __retl_o2_plus_1:
    35. 

  35. 	retl
    36. 

  36. 	 add	%o2, 1, %o0
    37. 

  37. 

  38. 	.align	32
    39. 

  39. 

  40. 	/* Don't try to get too fancy here, just nice and
    41. 

  41. 	 * simple.  This is predominantly used for well aligned
    42. 

  42. 	 * small copies in the compat layer.  It is also used
    43. 

  43. 	 * to copy register windows around during thread cloning.
    44. 

  44. 	 */
    45. 

  45. 

  46. ENTRY(___copy_in_user)	/* %o0=dst, %o1=src, %o2=len */
    47. 

  47. 	cmp		%o2, 0
    48. 

  48. 	be,pn		%XCC, 85f
    49. 

  49. 	 or		%o0, %o1, %o3
    50. 

  50. 	cmp		%o2, 16
    51. 

  51. 	bleu,a,pn	%XCC, 80f
    52. 

  52. 	 or		%o3, %o2, %o3
    53. 

  53. 

  54. 	/* 16 < len <= 64 */
    55. 

  55. 	andcc		%o3, 0x7, %g0
    56. 

  56. 	bne,pn		%XCC, 90f
    57. 

  57. 	 nop
    58. 

  58. 

  59. 	andn		%o2, 0x7, %o4
    60. 

  60. 	and		%o2, 0x7, %o2
    61. 

  61. 1:	subcc		%o4, 0x8, %o4
    62. 

  62. 	EX_O4(ldxa [%o1] %asi, %o5)
    63. 

  63. 	EX_O4(stxa %o5, [%o0] %asi)
    64. 

  64. 	add		%o1, 0x8, %o1
    65. 

  65. 	bgu,pt		%XCC, 1b
    66. 

  66. 	 add		%o0, 0x8, %o0
    67. 

  67. 	andcc		%o2, 0x4, %g0
    68. 

  68. 	be,pt		%XCC, 1f
    69. 

  69. 	 nop
    70. 

  70. 	sub		%o2, 0x4, %o2
    71. 

  71. 	EX_O2_4(lduwa [%o1] %asi, %o5)
    72. 

  72. 	EX_O2_4(stwa %o5, [%o0] %asi)
    73. 

  73. 	add		%o1, 0x4, %o1
    74. 

  74. 	add		%o0, 0x4, %o0
    75. 

  75. 1:	cmp		%o2, 0
    76. 

  76. 	be,pt		%XCC, 85f
    77. 

  77. 	 nop
    78. 

  78. 	ba,pt		%xcc, 90f
    79. 

  79. 	 nop
    80. 

  80. 

  81. 80:	/* 0 < len <= 16 */
    82. 

  82. 	andcc		%o3, 0x3, %g0
    83. 

  83. 	bne,pn		%XCC, 90f
    84. 

  84. 	 nop
    85. 

  85. 

  86. 82:
    87. 

  87. 	subcc		%o2, 4, %o2
    88. 

  88. 	EX_O2_4(lduwa [%o1] %asi, %g1)
    89. 

  89. 	EX_O2_4(stwa %g1, [%o0] %asi)
    90. 

  90. 	add		%o1, 4, %o1
    91. 

  91. 	bgu,pt		%XCC, 82b
    92. 

  92. 	 add		%o0, 4, %o0
    93. 

  93. 

  94. 85:	retl
    95. 

  95. 	 clr		%o0
    96. 

  96. 

  97. 	.align	32
    98. 

  98. 90:
    99. 

  99. 	subcc		%o2, 1, %o2
    100. 

  100. 	EX_O2_1(lduba [%o1] %asi, %g1)
    101. 

  101. 	EX_O2_1(stba %g1, [%o0] %asi)
    102. 

  102. 	add		%o1, 1, %o1
    103. 

  103. 	bgu,pt		%XCC, 90b
    104. 

  104. 	 add		%o0, 1, %o0
    105. 

  105. 	retl
    106. 

  106. 	 clr		%o0
    107. 

  107. ENDPROC(___copy_in_user)
    108.