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From: Neel Natu <neel@FreeBSD.org>
Date: Sat, 20 Feb 2010 07:34:37 +0000 (UTC)
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Subject: cvs commit: src/sys/mips/mips exception.S
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neel        2010-02-20 07:34:37 UTC

  FreeBSD src repository

  Modified files:
    sys/mips/mips        exception.S 
  Log:
  SVN rev 204109 on 2010-02-20 07:34:37Z by neel
  
  Fix DDB backtrace that includes a kernel exception frame.
  
  The backtrace code tries to look for an instruction of the form "sw ra, x(sp)"
  to figure out the program counter of the calling function. When we generate
  the kernel exception frame we store the 'ra' at the time of the exception
  using an instruction of the same form. The problem is that the 'ra' at the
  time of the exception is not the same as the 'program counter' at the time
  of the exception.
  
  The fix is to save the 'exception program counter' register by staging
  it through the 'ra' register.
  
  Revision  Changes    Path
  1.8       +14 -2     src/sys/mips/mips/exception.S