debug subcommand

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The debug subcommand prints additional information while the KDB kernel debugger is running to help ensure that the debugger is functioning properly.

Format

debug [options]

Parameters

Item	Description
options	Specifies the debug option to be turned on or off. View possible values by specifying the ? flag.

If the debug subcommand is invoked with no parameters, the currently-active debug options are displayed.

Other

No aliases.

Examples

The following is an example of how to use the debug subcommand:

   KDB(4)> debug ? //debug help
   vmm HW lookup debug... on with arg 'dbg1++', off with arg 'dbg1--'
   vmm tr/tv cmd debug... on with arg 'dbg2++', off with arg 'dbg2--'
   vmm SW lookup debug... on with arg 'dbg3++', off with arg 'dbg3--'
   symbol lookup debug... on with arg 'dbg4++', off with arg 'dbg4--'
   stack trace debug..... on with arg 'dbg5++', off with arg 'dbg5--'
   BRKPT debug (list).... on with arg 'dbg61++', off with arg 'dbg61--'
   BRKPT debug (instr)... on with arg 'dbg62++', off with arg 'dbg62--'
   BRKPT debug (suspend). on with arg 'dbg63++', off with arg 'dbg63--'
   BRKPT debug (phantom). on with arg 'dbg64++', off with arg 'dbg64--'
   BRKPT debug (context). on with arg 'dbg65++', off with arg 'dbg65--'
   DABR debug (address).. on with arg 'dbg71++', off with arg 'dbg71--'
   DABR debug (register). on with arg 'dbg72++', off with arg 'dbg72--'
   DABR debug (status)... on with arg 'dbg73++', off with arg 'dbg73--'
   BRAT debug (address).. on with arg 'dbg81++', off with arg 'dbg81--'
   BRAT debug (register). on with arg 'dbg82++', off with arg 'dbg82--'
   BRAT debug (status)... on with arg 'dbg83++', off with arg 'dbg83--'
   BRKPT debug (context). on  //this debug feature is enabled
   KDB(4)> debug dbg5++  //enable debug mode
   stack trace debug..... on
   KDB(4)> f  //stack frame in debug mode
   thread+000180 STACK:
   === Look for traceback at 0x00015278
   === Got traceback at 0x00015280 (delta = 0x00000008)
   === has_tboff = 1, tb_off = 0xD8
   === Trying to find Stack Update Code from 0x000151A8 to 0x00015278
   === Found 0x9421FFA0 at 0x000151B8
   === Trying to find Stack Restore Code from 0x000151A8 to 0x0001527C
   === Trying to find Registers Save Code from 0x000151A8 to 0x00015278
   [00015278]waitproc+0000D0 ()
   === Look for traceback at 0x00015274
   === Got traceback at 0x00015280 (delta = 0x0000000C)
   === has_tboff = 1, tb_off = 0xD8
   [00015274]waitproc+0000CC ()
   === Look for traceback at 0x0002F400
   === Got traceback at 0x0002F420 (delta = 0x00000020)
   === has_tboff = 1, tb_off = 0x30
   [0002F400]procentry+000010 (??, ??, ??, ??)

   /# ls  //Invoke command from command line that calls open
   Breakpoint
   0024FDE8     stwu   stkp,FFFFFFB0(stkp) stkp=2FF3B3C0,FFFFFFB0(stkp)=2FF3B370
   KDB(0)> time  //Report time from leaving the debugger till the break
   Command: time  Aliases:   
   Elapsed time since last leaving the debugger:
   2 seconds and 121211136 nanoseconds.
   KDB(0)>