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memset.S

memset.S 1.9 KB
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  1. /* Copyright (C) 1998 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 <features.h>
    21. 

  21. #include <sys/syscall.h>
    22. 

  22. 

  23. .text
    24. 

  24. .global memset
    25. 

  25. .type memset,%function
    26. 

  26. .align 4
    27. 

  27. 

  28. memset:
    29. 

  29. 	mov	a4, a1
    30. 

  30. 	cmp	a3, $8		@ at least 8 bytes to do?
    31. 

  31. 	blt	2f
    32. 

  32. 	orr	a2, a2, a2, lsl $8
    33. 

  33. 	orr	a2, a2, a2, lsl $16
    34. 

  34. 1:
    35. 

  35. 	tst	a4, $3		@ aligned yet?
    36. 

  36. 	strneb	a2, [a4], $1
    37. 

  37. 	subne	a3, a3, $1
    38. 

  38. 	bne	1b
    39. 

  39. 	mov	ip, a2
    40. 

  40. 1:
    41. 

  41. 	cmp	a3, $8		@ 8 bytes still to do?
    42. 

  42. 	blt	2f
    43. 

  43. 	stmia	a4!, {a2, ip}
    44. 

  44. 	sub	a3, a3, $8
    45. 

  45. 	cmp	a3, $8		@ 8 bytes still to do?
    46. 

  46. 	blt	2f
    47. 

  47. 	stmia	a4!, {a2, ip}
    48. 

  48. 	sub	a3, a3, $8
    49. 

  49. 	cmp	a3, $8		@ 8 bytes still to do?
    50. 

  50. 	blt	2f
    51. 

  51. 	stmia	a4!, {a2, ip}
    52. 

  52. 	sub	a3, a3, $8
    53. 

  53. 	cmp	a3, $8		@ 8 bytes still to do?
    54. 

  54. 	stmgeia	a4!, {a2, ip}
    55. 

  55. 	subge	a3, a3, $8
    56. 

  56. 	bge	1b
    57. 

  57. 2:
    58. 

  58. 	movs	a3, a3		@ anything left?
    59. 

  59. #if defined(__USE_BX__)
    60. 

  60.         bxeq    lr
    61. 

  61. #else
    62. 

  62.         moveq	pc, lr		@ nope
    63. 

  63. #endif
    64. 

  64. 	rsb	a3, a3, $7
    65. 

  65. 	add	pc, pc, a3, lsl $2
    66. 

  66. 	mov	r0, r0
    67. 

  67. 	strb	a2, [a4], $1
    68. 

  68. 	strb	a2, [a4], $1
    69. 

  69. 	strb	a2, [a4], $1
    70. 

  70. 	strb	a2, [a4], $1
    71. 

  71. 	strb	a2, [a4], $1
    72. 

  72. 	strb	a2, [a4], $1
    73. 

  73. 	strb	a2, [a4], $1
    74. 

  74. #if defined(__USE_BX__)
    75. 

  75.         bx      lr
    76. 

  76. #else
    77. 

  77.  	mov	pc, lr
    78. 

  78. #endif
    79. 

  79. 

  80. .size memset,.-memset
    81. 

  81. 

  82. libc_hidden_def(memset)
    83.