debugger: add regions command.

To dump the list of memory regions.

debugger/debugger.cpp

@@ -89,6 +89,7 @@ static void show_help() {
     cout << "  setmem X=V.T   -- set memory at address X to value V of size T" << endl;
     cout << "                    T can be b(byte), w(word), d(double)," << endl;
     cout << "                    q(quad) or c(character)." << endl;
+    cout << "  regions        -- dump memory regions" << endl;
     cout << "  profile C N    -- run subcommand C on profile N" << endl;
     cout << "                    supported subcommands:" << endl;
     cout << "                    'show' - show profile report" << endl;
@@ -881,6 +882,10 @@ void DppcDebugger::enter_debugger() {
                 cout << "Unknown debugging context: " << expr_str << endl;
             }
 #endif
+        } else if (cmd == "regions") {
+            cmd = "";
+            if (mem_ctrl_instance)
+                mem_ctrl_instance->dump_regions();
         } else if (cmd == "printenv") {
             cmd = "";
             if (ofnvram->init())

devices/memctrl/memctrlbase.cpp

@@ -372,3 +372,13 @@ uint8_t *MemCtrlBase::get_region_hostmem_ptr(const uint32_t addr) {
     else
         return (addr - reg_desc->start) + reg_desc->mem_ptr;
 }
+
+
+void MemCtrlBase::dump_regions()
+{
+    int i = 0;
+    for (auto& entry : address_map) {
+        printf("%2d: %s\n", i, get_entry_str(entry).c_str());
+        i++;
+    }
+}

devices/memctrl/memctrlbase.h

@@ -88,6 +88,8 @@ public:
 
     uint8_t *get_region_hostmem_ptr(const uint32_t addr);
 
+    void dump_regions();
+
 protected:
     bool add_mem_region(
         uint32_t start_addr, uint32_t size, uint32_t dest_addr, uint32_t type,