gdbinit: add support for reporting total and used stack size

This checks if the required function is defined (when stack coloration
is enabled) and, if so, calls it to get used stack. Otherwise it just
reports zero used stack.

tools/nuttx-gdbinit

@@ -67,6 +67,9 @@ define _examine_target
 
     set $_target_max_tasks = sizeof(g_pidhash) / sizeof(struct pidhash_s)
 
+    python if (type(gdb.lookup_global_symbol("up_check_tcbstack")) is gdb.Symbol) : \
+    gdb.execute("set $_target_has_stack_coloration = 1")
+
     printf "target examined \n"
     python print("_target_arch.name=" + _target_arch.name())
 
@@ -88,9 +91,15 @@ define _print_thread
     printf "  "
   end
 
-  printf "%d Thread 0x%x  (Name: %s, State: %s, Priority: %d) 0x%x in ", \
+  if ($_target_has_stack_coloration)
+    set $stack_used = up_check_tcbstack($tcb)
+  else
+    set $stack_used = 0
+  end
+
+  printf "%d Thread 0x%x  (Name: %s, State: %s, Priority: %d, Stack: %d/%d) PC: 0x%x in ", \
   $tcb->pid, $tcb, $tcb->name, g_statenames[$tcb->task_state], $tcb->sched_priority, \
-  $tcb->xcp.regs[$_pc_reg_idx]
+  $stack_used, $tcb->adj_stack_size, $tcb->xcp.regs[$_pc_reg_idx]
   python _symbol = gdb.execute("info symbol $tcb->xcp.regs[$_pc_reg_idx]", to_string=True); \
   print(_symbol.split()[0] + "()")
 end