strcmp.S 2.2 KB

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  1. /*
  2. * Copyright (c) 2002 ARM Ltd
  3. * All rights reserved.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions
  7. * are met:
  8. * 1. Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * 2. Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in the
  12. * documentation and/or other materials provided with the distribution.
  13. * 3. The name of the company may not be used to endorse or promote
  14. * products derived from this software without specific prior written
  15. * permission.
  16. *
  17. * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
  18. * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19. * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20. * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  22. * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  23. * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  24. * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  25. * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  26. * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27. *
  28. * Adapted for uClibc from NetBSD strcmp.S, version 1.3 2003/04/05
  29. * by Erik Andersen <andersen@codepoet.org>
  30. */
  31. #include <features.h>
  32. #include <bits/arm_asm.h>
  33. .text
  34. .global strcmp
  35. .type strcmp,%function
  36. .align 4
  37. #if defined(__thumb__) && !defined(__thumb2__)
  38. .thumb_func
  39. strcmp:
  40. 1:
  41. ldrb r2, [r0]
  42. add r0, r0, #1
  43. ldrb r3, [r1]
  44. add r1, r1, #1
  45. cmp r2, #0
  46. beq 2f
  47. cmp r2, r3
  48. beq 1b
  49. 2:
  50. sub r0, r2, r3
  51. bx lr
  52. #else
  53. strcmp:
  54. 1:
  55. ldrb r2, [r0], #1
  56. ldrb r3, [r1], #1
  57. cmp r2, #1
  58. IT(t, cs)
  59. cmpcs r2, r3
  60. beq 1b
  61. sub r0, r2, r3
  62. #if defined(__USE_BX__)
  63. bx lr
  64. #else
  65. mov pc, lr
  66. #endif
  67. #endif
  68. .size strcmp,.-strcmp
  69. libc_hidden_def(strcmp)
  70. #ifndef __UCLIBC_HAS_LOCALE__
  71. strong_alias(strcmp,strcoll)
  72. libc_hidden_def(strcoll)
  73. #endif