kuser32.S 1.8 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. /*
  3. * AArch32 user helpers.
  4. * Based on the kuser helpers in arch/arm/kernel/entry-armv.S.
  5. *
  6. * Copyright (C) 2005-2011 Nicolas Pitre <nico@fluxnic.net>
  7. * Copyright (C) 2012-2018 ARM Ltd.
  8. *
  9. * The kuser helpers below are mapped at a fixed address by
  10. * aarch32_setup_additional_pages() and are provided for compatibility
  11. * reasons with 32 bit (aarch32) applications that need them.
  12. *
  13. * See Documentation/arm/kernel_user_helpers.rst for formal definitions.
  14. */
  15. #include <asm/unistd.h>
  16. .align 5
  17. .globl __kuser_helper_start
  18. __kuser_helper_start:
  19. __kuser_cmpxchg64: // 0xffff0f60
  20. .inst 0xe92d00f0 // push {r4, r5, r6, r7}
  21. .inst 0xe1c040d0 // ldrd r4, r5, [r0]
  22. .inst 0xe1c160d0 // ldrd r6, r7, [r1]
  23. .inst 0xe1b20f9f // 1: ldrexd r0, r1, [r2]
  24. .inst 0xe0303004 // eors r3, r0, r4
  25. .inst 0x00313005 // eoreqs r3, r1, r5
  26. .inst 0x01a23e96 // stlexdeq r3, r6, [r2]
  27. .inst 0x03330001 // teqeq r3, #1
  28. .inst 0x0afffff9 // beq 1b
  29. .inst 0xf57ff05b // dmb ish
  30. .inst 0xe2730000 // rsbs r0, r3, #0
  31. .inst 0xe8bd00f0 // pop {r4, r5, r6, r7}
  32. .inst 0xe12fff1e // bx lr
  33. .align 5
  34. __kuser_memory_barrier: // 0xffff0fa0
  35. .inst 0xf57ff05b // dmb ish
  36. .inst 0xe12fff1e // bx lr
  37. .align 5
  38. __kuser_cmpxchg: // 0xffff0fc0
  39. .inst 0xe1923f9f // 1: ldrex r3, [r2]
  40. .inst 0xe0533000 // subs r3, r3, r0
  41. .inst 0x01823e91 // stlexeq r3, r1, [r2]
  42. .inst 0x03330001 // teqeq r3, #1
  43. .inst 0x0afffffa // beq 1b
  44. .inst 0xf57ff05b // dmb ish
  45. .inst 0xe2730000 // rsbs r0, r3, #0
  46. .inst 0xe12fff1e // bx lr
  47. .align 5
  48. __kuser_get_tls: // 0xffff0fe0
  49. .inst 0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3
  50. .inst 0xe12fff1e // bx lr
  51. .rep 5
  52. .word 0
  53. .endr
  54. __kuser_helper_version: // 0xffff0ffc
  55. .word ((__kuser_helper_end - __kuser_helper_start) >> 5)
  56. .globl __kuser_helper_end
  57. __kuser_helper_end: