Home Explore Help
Register Sign In
phyus
/
linux-vybrid_public
8
0
Fork 0
Files Issues 0 Pull Requests 0 Wiki
Tree: 2b51a9b9eb
Branches Tags
linux-vybrid_pu...
/
arch
/
s390
/
kernel
/
mcount64.S

mcount64.S 1.2 KB
History Raw

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465 
  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. 	larl	%r1,function_trace_stop
    24. 

  24. 	icm	%r1,0xf,0(%r1)
    25. 

  25. 	bnzr	%r14
    26. 

  26. 	stmg	%r2,%r5,32(%r15)
    27. 

  27. 	stg	%r14,112(%r15)
    28. 

  28. 	lgr	%r1,%r15
    29. 

  29. 	aghi	%r15,-160
    30. 

  30. 	stg	%r1,__SF_BACKCHAIN(%r15)
    31. 

  31. 	lgr	%r2,%r14
    32. 

  32. 	lg	%r3,168(%r15)
    33. 

  33. 	aghi	%r2,-MCOUNT_INSN_SIZE
    34. 

  34. 	larl	%r14,ftrace_trace_function
    35. 

  35. 	lg	%r14,0(%r14)
    36. 

  36. 	basr	%r14,%r14
    37. 

  37. #ifdef CONFIG_FUNCTION_GRAPH_TRACER
    38. 

  38. 	lg	%r2,168(%r15)
    39. 

  39. 	lg	%r3,272(%r15)
    40. 

  40. ENTRY(ftrace_graph_caller)
    41. 

  41. # The bras instruction gets runtime patched to call prepare_ftrace_return.
    42. 

  42. # See ftrace_enable_ftrace_graph_caller. The patched instruction is:
    43. 

  43. #	bras	%r14,prepare_ftrace_return
    44. 

  44. 	bras	%r14,0f
    45. 

  45. 0:	stg	%r2,168(%r15)
    46. 

  46. #endif
    47. 

  47. 	aghi	%r15,160
    48. 

  48. 	lmg	%r2,%r5,32(%r15)
    49. 

  49. 	lg	%r14,112(%r15)
    50. 

  50. 	br	%r14
    51. 

  51. 

  52. #ifdef CONFIG_FUNCTION_GRAPH_TRACER
    53. 

  53. 

  54. ENTRY(return_to_handler)
    55. 

  55. 	stmg	%r2,%r5,32(%r15)
    56. 

  56. 	lgr	%r1,%r15
    57. 

  57. 	aghi	%r15,-160
    58. 

  58. 	stg	%r1,__SF_BACKCHAIN(%r15)
    59. 

  59. 	brasl	%r14,ftrace_return_to_handler
    60. 

  60. 	aghi	%r15,160
    61. 

  61. 	lgr	%r14,%r2
    62. 

  62. 	lmg	%r2,%r5,32(%r15)
    63. 

  63. 	br	%r14
    64. 

  64. 

  65. #endif
    66.