Index: lldb/source/Core/IOHandler.cpp
===================================================================
--- lldb/source/Core/IOHandler.cpp
+++ lldb/source/Core/IOHandler.cpp
@@ -3771,6 +3771,8 @@
         {'o', "Step out"},
         {'s', "Step in (source line)"},
         {'S', "Step in (single instruction)"},
+        {'u', "Frame up"},
+        {'d', "Frame down"},
         {',', "Page up"},
         {'.', "Page down"},
         {'\0', nullptr}};
@@ -4395,6 +4397,26 @@
     }
       return eKeyHandled;
 
+    case 'u': // 'u' == frame up
+    case 'd': // 'd' == frame down
+    {
+      ExecutionContext exe_ctx =
+          m_debugger.GetCommandInterpreter().GetExecutionContext();
+      if (exe_ctx.HasThreadScope()) {
+        Thread* thread = exe_ctx.GetThreadPtr();
+        uint32_t frame_idx = thread->GetSelectedFrameIndex();
+        if (frame_idx == UINT32_MAX)
+          frame_idx = 0;
+        if( c == 'u' && frame_idx + 1 < thread->GetStackFrameCount())
+            ++frame_idx;
+        else if (c =='d' && frame_idx > 0)
+            --frame_idx;
+        if( thread->SetSelectedFrameByIndex( frame_idx, true ))
+          exe_ctx.SetFrameSP(thread->GetSelectedFrame());
+      }
+    }
+      return eKeyHandled;
+
     case 'h':
       window.CreateHelpSubwindow();
       return eKeyHandled;