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ktrace 1.3 KB

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  1. .TH KTRACE 1
  2. .SH NAME
  3. ktrace \- interpret kernel stack dumps
  4. .SH SYNOPSIS
  5. .B ktrace
  6. [
  7. .B -i
  8. ]
  9. .I kernel
  10. .I pc
  11. .I sp
  12. [
  13. .I link
  14. ]
  15. .SH DESCRIPTION
  16. .I Ktrace
  17. translates a hexadecimal kernel stack dump
  18. into a sequence of
  19. .IR acid (1)
  20. commands to show the points in the call trace.
  21. The
  22. .I kernel
  23. argument should be the path of the kernel being debugged,
  24. and
  25. .I pc
  26. and
  27. .I sp
  28. are the PC and SP values given in the stack dump.
  29. For MIPS kernels, the contents of the
  30. .I link
  31. register must also be supplied.
  32. .PP
  33. A stack trace consists of a
  34. .I ktrace
  35. command followed by a series of lines containing
  36. fields of the form
  37. .IB location = contents \fR:
  38. .EX
  39. ktrace /kernel/path 80105bc1 8048e174
  40. 8048e114=80105ac6 8048e120=80140bb4 8048e134=8010031c
  41. 8048e16c=80137e45 8048e170=80105bc1 8048e178=80137e62
  42. \&...
  43. .EE
  44. .PP
  45. The trace can be edited to provide the correct kernel path
  46. and then pasted into a shell window.
  47. If the
  48. .B -i
  49. option is present,
  50. .I ktrace
  51. instead prompts for the contents of the memory locations in which it is interested;
  52. this is useful when the stack trace is on a screen rather than
  53. in a machine readable form.
  54. .SH SOURCE
  55. .B /sys/src/cmd/ktrace.c
  56. .SH SEE ALSO
  57. .IR acid (1),
  58. .IR rdbfs (4)
  59. .SH BUGS
  60. When examining a kernel trace resulting from
  61. an interrupt on top of other interrupts,
  62. only the topmost call trace is printed.