Piko/RT Debugging

Using tmux

tmux is a “terminal multiplexer”, it allow you accessed and controllerd multiple terminals inside a signle terminal like this:

How to use tmux, please reference these pages:

• tmux wiki
• A tmux Crash Course
• A Quick and Easy Guide to tmux

Using OpenOCD

XXX

Using gdb scripts

Here are some debug scripts for gdb. You can copy and paste to your .gdbinit, then used in gdb.

1. Dump out bitmap scheduler active and expire queue:

   define dump_bitmap
     set $prio = 0
     while $prio < 32
       if $arg0 == 1
         p (struct thread_info *)((char *)(sched_struct.active->queue[$prio].next) - 0x28)
       end
       if $arg0 == 0
         p (struct thread_info *)((char *)(sched_struct.expire->queue[$prio].next) - 0x28)
       end
       set $prio = $prio + 1
     end
   end
   

   how to use:

   (gdb) dump_bitmap 1   # Dump active
   $1 = (struct thread_info *) 0x20000d2c <vsnprintf_buf+228>
   $2 = (struct thread_info *) 0x20000d34 <vsnprintf_buf+236>
   $3 = (struct thread_info *) 0x20000d3c <vsnprintf_buf+244>
   $4 = (struct thread_info *) 0x20000d44 <vsnprintf_buf+252>
   $5 = (struct thread_info *) 0x20000d4c <sched>
   $6 = (struct thread_info *) 0x20000d54 <_active+4>
   ...
   (gdb) dump_bitmap 0   # Dump expire
   

2. Dump out RR scheduler runqueue:

   define dump_rr
     if list_empty(&rr_runq)
       p "empty rr"
     else
       set $pos = rr_runq->next
       while $pos != &rr_runq
         p (struct thread_info *)((char *)($pos)-0x28)
         set $pos = $pos->next
       end
     end
   end
   

   how to use:

   (gdb) dump_rr