1  FLT_Extension
   The Alignment Fault Utility (FLT) finds alignment faults and
   records them in a ring buffer, which can be sized when starting
   alignment fault tracing. The summary screen displays the results
   sorted by the program counter (PC) that has incurred the most
   alignment faults. The detailed trace output also shows the
   process identification (PID) of the process that caused the
   alignment fault, with the virtual address that triggered the
   fault.

   Output can be directed to a file using the SDA SET OUTPUT
   command.

   When entered by itself with no command keyword, the FLT command
   lists the FLT command options.

        SDA> FLT

   You can get full help on FLT by entering HELP FLT at the SDA>
   prompt.

   FLT can be started and stopped as required without the need for a
   system reboot.
 

2  LOAD
   Loads the FLT$DEBUG execlet. Do this before starting alignment
   fault tracing.

   Format

     FLT LOAD
 

2  SHOW
 

3  TRACE
   Displays detail about the trace.

   Format

     FLT SHOW TRACE  [/SUMMARY]
 

4  Qualifier
 

/SUMMARY

   Displays the results sorted by the program counter (PC) that has
   incurred the most alignment faults.
 

2  START
 

3  TRACE
   Starts alignment fault tracing. By default, all PCs are traced.

   Format

     START TRACE  [/BUFFER=pages] [/BEGIN=pc_range_low]

                  [/CALLER] [/END=pc_range_high]

                  [/INDEX=pid] [MODE=(mode,...)]
 

4  Qualifiers
 

/BUFFER

      /BUFFER=pages

   The number of pages to size the trace buffer. The default is 128
   pages or 1MB.
 

/BEGIN

      /BEGIN=pc_range_low

   Start of range of PCs to trace.
 

/CALLER

   For each alignment fault, in addition to recording the PC that
   incurred the fault, FLT also records the PCs of the caller, the
   callers caller, and so on, for up to 10 call frames.
 

/END

      /END=pc_range_high

   End of range of PCs to trace.
 

/INDEX

      /INDEX=pid

   Only trace alignment faults for the specified process. You can
   specify the process index itself, or the process identification
   or extended process identification, from which the process index
   is extracted.
 

/MODE

      /MODE=(mode,...)

   Only trace alignment faults that occur in the specified modes.
   Allowed modes are KERNEL, EXEC, SUPER and USER. If you specify
   only one mode, you can omit the parentheses.
 

2  STOP
 

3  TRACE
   Stops tracing.

   Format

     FLT STOP TRACE
 

2  UNLOAD
   Unloads the FLT$DEBUG execlet.

   Format

     FLT UNLOAD