Driver testing and debugging

Useful kdb commands (SVR5 only)

The kernel debuggers are powerful tools with many capabilities. The following list gives some interesting sequences.

To collect a log on the remote system with information about all calls to the udi_dma_buf_map( ) function, use the following command sequence:
```
   kdb>> 1000 db_nlines w
   kdb>> udi_dma_buf_map "stack\n\
   kdb>> q\nn\
   kdb>> " b
   kdb >> q
```
To perform a sysdump:
```
   kdb>> sysdump 0 vcall
```
Note that this works only if there is a single breakpoint set in the kernel that is being tested.
To kill the current process on a uniprocessor system by sending signal 9:
```
   kdb>> uprocp  r  9  0  sigtoproc  3  vcall
```

To send a signal to a specified process:

   kdb>> ps	# Locate the target "proc ** in column 2 (PP)
   kdb>> <pp> <signal>  0  sigtoproc  3  vcall