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strcpy.S

strcpy.S 2.0 KB
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  1. /* Cloned and hacked for uClibc by Paul Mundt, December 2003 */
    2. 

  2. /* Modified by SuperH, Inc. September 2003 */
    3. 

  3. ! Entry: arg0: destination
    4. 

  4. !        arg1: source
    5. 

  5. ! Exit:  result: destination
    6. 

  6. !
    7. 

  7. ! SH5 code Copyright 2002 SuperH Ltd.
    8. 

  8. 

  9. #include <features.h>
    10. 

  10. #include <endian.h>
    11. 

  11. 

  12. #if __BYTE_ORDER == __LITTLE_ENDIAN
    13. 

  13. #define SHHI shlld
    14. 

  14. #define SHLO shlrd
    15. 

  15. #else
    16. 

  16. #define SHHI shlrd
    17. 

  17. #define SHLO shlld
    18. 

  18. #endif
    19. 

  19. 

  20. 	.section .text..SHmedia32,"ax"
    21. 

  21. 	.globl	strcpy
    22. 

  22. 	.type	strcpy, @function
    23. 

  23. 	.align 5
    24. 

  24. 

  25. strcpy:
    26. 

  26. 

  27. 	pta/l shortstring,tr1
    28. 

  28. 	ldlo.q r3,0,r4
    29. 

  29. 	ptabs r18,tr4
    30. 

  30. 	shlli r3,3,r7
    31. 

  31. 	addi r2, 8, r0
    32. 

  32. 	mcmpeq.b r4,r63,r6
    33. 

  33. 	SHHI r6,r7,r6
    34. 

  34. 	bnei/u r6,0,tr1 // shortstring
    35. 

  35. 	pta/l no_lddst, tr2
    36. 

  36. 	ori r3,-8,r23
    37. 

  37. 	sub r2, r23, r0
    38. 

  38. 	sub r3, r2, r21
    39. 

  39. 	addi r21, 8, r20
    40. 

  40. 	ldx.q r0, r21, r5
    41. 

  41. 	pta/l loop, tr0
    42. 

  42. 	ori r2,-8,r22
    43. 

  43. 	mcmpeq.b r5, r63, r6
    44. 

  44. 	bgt/u r22, r23, tr2 // no_lddst
    45. 

  45. 

  46. 	// r22 < r23 :  Need to do a load from the destination.
    47. 

  47. 	// r22 == r23 : Doesn't actually need to load from destination,
    48. 

  48. 	//              but still can be handled here.
    49. 

  49. 	ldlo.q r2, 0, r9
    50. 

  50. 	movi -1, r8
    51. 

  51. 	SHLO r8, r7, r8
    52. 

  52. 	mcmv r4, r8, r9
    53. 

  53. 	stlo.q r2, 0, r9
    54. 

  54. 	beqi/l r6, 0, tr0 // loop
    55. 

  55. 

  56. 	add r5, r63, r4
    57. 

  57. 	addi r0, 8, r0
    58. 

  58. 	blink tr1, r63 // shortstring
    59. 

  59. no_lddst:
    60. 

  60. 	// r22 > r23: note that for r22 == r23 the sthi.q would clobber
    61. 

  61. 	//            bytes before the destination region.
    62. 

  62. 	stlo.q r2, 0, r4
    63. 

  63. 	SHHI r4, r7, r4
    64. 

  64. 	sthi.q r0, -1, r4
    65. 

  65. 	beqi/l r6, 0, tr0 // loop
    66. 

  66. 

  67. 	add r5, r63, r4
    68. 

  68. 	addi r0, 8, r0
    69. 

  69. shortstring:
    70. 

  70. #if __BYTE_ORDER != __LITTLE_ENDIAN
    71. 

  71. 	pta/l shortstring2,tr1
    72. 

  72. 	byterev r4,r4
    73. 

  73. #endif
    74. 

  74. shortstring2:
    75. 

  75. 	st.b r0,-8,r4
    76. 

  76. 	andi r4,0xff,r5
    77. 

  77. 	shlri r4,8,r4
    78. 

  78. 	addi r0,1,r0
    79. 

  79. 	bnei/l r5,0,tr1
    80. 

  80. 	blink tr4,r63 // return
    81. 

  81. 	
    82. 

  82. 	.balign 8
    83. 

  83. loop:
    84. 

  84. 	stlo.q r0, 0, r5
    85. 

  85. 	ldx.q r0, r20, r4
    86. 

  86. 	addi r0, 16, r0
    87. 

  87. 	sthi.q r0, -9, r5
    88. 

  88. 	mcmpeq.b r4, r63, r6
    89. 

  89. 	bnei/u r6, 0, tr1 // shortstring
    90. 

  90. 	ldx.q r0, r21, r5
    91. 

  91. 	stlo.q r0, -8, r4
    92. 

  92. 	sthi.q r0, -1, r4
    93. 

  93. 	mcmpeq.b r5, r63, r6
    94. 

  94. 	beqi/l r6, 0, tr0 // loop
    95. 

  95. 

  96. 	add r5, r63, r4
    97. 

  97. 	addi r0, 8, r0
    98. 

  98. 	blink tr1, r63 // shortstring
    99. 

  99. 

  100. 	.size	strcpy,.-strcpy
    101. 

  101. 

  102. libc_hidden_def(strcpy)
    103.