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trace
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ftrace_64.S

ftrace_64.S 1.3 KB
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  1. /*
    2. 

  2.  * Split from entry_64.S
    3. 

  3.  *
    4. 

  4.  * This program is free software; you can redistribute it and/or
    5. 

  5.  * modify it under the terms of the GNU General Public License
    6. 

  6.  * as published by the Free Software Foundation; either version
    7. 

  7.  * 2 of the License, or (at your option) any later version.
    8. 

  8.  */
    9. 

  9. 

  10. #include <linux/magic.h>
    11. 

  11. #include <asm/ppc_asm.h>
    12. 

  12. #include <asm/asm-offsets.h>
    13. 

  13. #include <asm/ftrace.h>
    14. 

  14. #include <asm/ppc-opcode.h>
    15. 

  15. #include <asm/export.h>
    16. 

  16. 

  17. .pushsection ".tramp.ftrace.text","aw",@progbits;
    18. 

  18. .globl ftrace_tramp_text
    19. 

  19. ftrace_tramp_text:
    20. 

  20. 	.space 64
    21. 

  21. .popsection
    22. 

  22. 

  23. .pushsection ".tramp.ftrace.init","aw",@progbits;
    24. 

  24. .globl ftrace_tramp_init
    25. 

  25. ftrace_tramp_init:
    26. 

  26. 	.space 64
    27. 

  27. .popsection
    28. 

  28. 

  29. _GLOBAL(mcount)
    30. 

  30. _GLOBAL(_mcount)
    31. 

  31. EXPORT_SYMBOL(_mcount)
    32. 

  32. 	mflr	r12
    33. 

  33. 	mtctr	r12
    34. 

  34. 	mtlr	r0
    35. 

  35. 	bctr
    36. 

  36. 

  37. #ifdef CONFIG_FUNCTION_GRAPH_TRACER
    38. 

  38. _GLOBAL(return_to_handler)
    39. 

  39. 	/* need to save return values */
    40. 

  40. 	std	r4,  -32(r1)
    41. 

  41. 	std	r3,  -24(r1)
    42. 

  42. 	/* save TOC */
    43. 

  43. 	std	r2,  -16(r1)
    44. 

  44. 	std	r31, -8(r1)
    45. 

  45. 	mr	r31, r1
    46. 

  46. 	stdu	r1, -112(r1)
    47. 

  47. 

  48. 	/*
    49. 

  49. 	 * We might be called from a module.
    50. 

  50. 	 * Switch to our TOC to run inside the core kernel.
    51. 

  51. 	 */
    52. 

  52. 	ld	r2, PACATOC(r13)
    53. 

  53. 

  54. 	bl	ftrace_return_to_handler
    55. 

  55. 	nop
    56. 

  56. 

  57. 	/* return value has real return address */
    58. 

  58. 	mtlr	r3
    59. 

  59. 

  60. 	ld	r1, 0(r1)
    61. 

  61. 	ld	r4,  -32(r1)
    62. 

  62. 	ld	r3,  -24(r1)
    63. 

  63. 	ld	r2,  -16(r1)
    64. 

  64. 	ld	r31, -8(r1)
    65. 

  65. 

  66. 	/* Jump back to real return address */
    67. 

  67. 	blr
    68. 

  68. #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
    69.