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string
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arm
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memcmp.S

memcmp.S 2.0 KB
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  1. /*
    2. 

  2.  * Copyright (c) 2002 ARM Ltd
    3. 

  3.  * All rights reserved.
    4. 

  4.  *
    5. 

  5.  * Redistribution and use in source and binary forms, with or without
    6. 

  6.  * modification, are permitted provided that the following conditions
    7. 

  7.  * are met:
    8. 

  8.  * 1. Redistributions of source code must retain the above copyright
    9. 

  9.  *    notice, this list of conditions and the following disclaimer.
    10. 

  10.  * 2. Redistributions in binary form must reproduce the above copyright
    11. 

  11.  *    notice, this list of conditions and the following disclaimer in the
    12. 

  12.  *    documentation and/or other materials provided with the distribution.
    13. 

  13.  * 3. The name of the company may not be used to endorse or promote
    14. 

  14.  *    products derived from this software without specific prior written
    15. 

  15.  *    permission.
    16. 

  16.  *
    17. 

  17.  * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
    18. 

  18.  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
    19. 

  19.  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    20. 

  20.  * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    21. 

  21.  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
    22. 

  22.  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    23. 

  23.  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
    24. 

  24.  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    25. 

  25.  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    26. 

  26.  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    27. 

  27.  *
    28. 

  28.  * Adapted for uClibc from NetBSD memcmp.S, version 1.2 2003/04/05
    29. 

  29.  * by Erik Andersen <andersen@codepoet.org>
    30. 

  30.  */
    31. 

  31. 

  32. #include <features.h>
    33. 

  33. 

  34. .text
    35. 

  35. .global memcmp
    36. 

  36. .type memcmp,%function
    37. 

  37. .align 4
    38. 

  38. 

  39. memcmp:
    40. 

  40. 	/* if ((len - 1) < 0) return 0 */
    41. 

  41. 	subs	r2, r2, #1
    42. 

  42. 	movmi	r0, #0
    43. 

  43. #if defined(__USE_BX__)
    44. 

  44.         bxmi    lr
    45. 

  45. #else
    46. 

  46. 	movmi	pc, lr
    47. 

  47. #endif
    48. 

  48. 	/* ip == last src address to compare */
    49. 

  49. 	add	ip, r0, r2
    50. 

  50. 1:
    51. 

  51. 	ldrb	r2, [r0], #1
    52. 

  52. 	ldrb	r3, [r1], #1
    53. 

  53. 	cmp	ip, r0
    54. 

  54. 	cmpcs	r2, r3
    55. 

  55. 	beq	1b
    56. 

  56. 	sub	r0, r2, r3
    57. 

  57. #if defined(__USE_BX__)
    58. 

  58.         bx      lr
    59. 

  59. #else
    60. 

  60.  	mov	pc, lr
    61. 

  61. #endif
    62. 

  62. 

  63. .size memcmp,.-memcmp
    64. 

  64. 

  65. libc_hidden_def(memcmp)
    66. 

  66. strong_alias(memcmp,bcmp)
    67.