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mcount64.S

mcount64.S 1.2 KB
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  1. /*
    2. 

  2.  * Copyright IBM Corp. 2008, 2009
    3. 

  3.  *
    4. 

  4.  *   Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
    5. 

  5.  *
    6. 

  6.  */
    7. 

  7. 

  8. #include <linux/linkage.h>
    9. 

  9. #include <asm/asm-offsets.h>
    10. 

  10. #include <asm/ftrace.h>
    11. 

  11. 

  12. 	.section .kprobes.text, "ax"
    13. 

  13. 

  14. ENTRY(ftrace_stub)
    15. 

  15. 	br	%r14
    16. 

  16. 

  17. ENTRY(_mcount)
    18. 

  18. #ifdef CONFIG_DYNAMIC_FTRACE
    19. 

  19. 	br	%r14
    20. 

  20. 

  21. ENTRY(ftrace_caller)
    22. 

  22. #endif
    23. 

  23. 	stmg	%r2,%r5,32(%r15)
    24. 

  24. 	stg	%r14,112(%r15)
    25. 

  25. 	lgr	%r1,%r15
    26. 

  26. 	aghi	%r15,-160
    27. 

  27. 	stg	%r1,__SF_BACKCHAIN(%r15)
    28. 

  28. 	lgr	%r2,%r14
    29. 

  29. 	lg	%r3,168(%r15)
    30. 

  30. 	aghi	%r2,-MCOUNT_INSN_SIZE
    31. 

  31. 	larl	%r14,ftrace_trace_function
    32. 

  32. 	lg	%r14,0(%r14)
    33. 

  33. 	basr	%r14,%r14
    34. 

  34. #ifdef CONFIG_FUNCTION_GRAPH_TRACER
    35. 

  35. 	lg	%r2,168(%r15)
    36. 

  36. 	lg	%r3,272(%r15)
    37. 

  37. ENTRY(ftrace_graph_caller)
    38. 

  38. # The bras instruction gets runtime patched to call prepare_ftrace_return.
    39. 

  39. # See ftrace_enable_ftrace_graph_caller. The patched instruction is:
    40. 

  40. #	bras	%r14,prepare_ftrace_return
    41. 

  41. 	bras	%r14,0f
    42. 

  42. 0:	stg	%r2,168(%r15)
    43. 

  43. #endif
    44. 

  44. 	aghi	%r15,160
    45. 

  45. 	lmg	%r2,%r5,32(%r15)
    46. 

  46. 	lg	%r14,112(%r15)
    47. 

  47. 	br	%r14
    48. 

  48. 

  49. #ifdef CONFIG_FUNCTION_GRAPH_TRACER
    50. 

  50. 

  51. ENTRY(return_to_handler)
    52. 

  52. 	stmg	%r2,%r5,32(%r15)
    53. 

  53. 	lgr	%r1,%r15
    54. 

  54. 	aghi	%r15,-160
    55. 

  55. 	stg	%r1,__SF_BACKCHAIN(%r15)
    56. 

  56. 	brasl	%r14,ftrace_return_to_handler
    57. 

  57. 	aghi	%r15,160
    58. 

  58. 	lgr	%r14,%r2
    59. 

  59. 	lmg	%r2,%r5,32(%r15)
    60. 

  60. 	br	%r14
    61. 

  61. 

  62. #endif
    63.