cvs commit: src/sys/amd64/include pmc_mdep.h src/sys/dev/hwpmc hwpmc_x86.c src/sys/i386/include pmc_mdep.h

[Joseph Koshy]

jkoshy      2008-09-15 06:47:52 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/include    pmc_mdep.h 
    sys/dev/hwpmc        hwpmc_x86.c 
    sys/i386/include     pmc_mdep.h 
  Log:
  SVN rev 183033 on 2008-09-15 06:47:52Z by jkoshy
  
  Correct a callchain capture bug on the i386.
  
  On the i386 architecture, the processor only saves the current value
  of `%esp' on stack if a privilege switch is necessary when entering
  the interrupt handler.   Thus, `frame->tf_esp' is only valid for
  an entry from user mode.  For interrupts taken in kernel mode, we
  need to determine the top-of-stack for the interrupted kernel
  procedure by adding the appropriate offset to the current frame
  pointer.
  
  Reported by:    kris, Fabien Thomas
  Tested by:      Fabien Thomas <fabien.thomas at netasq dot com>
  
  Revision  Changes    Path
  1.6       +3 -2      src/sys/amd64/include/pmc_mdep.h
  1.8       +3 -3      src/sys/dev/hwpmc/hwpmc_x86.c
  1.8       +20 -2     src/sys/i386/include/pmc_mdep.h