RealView Debugger User Guide - ARM Information Center

Memory Mapping5.6 Setting top_of_memory and stack valuesIf defined, the top_of_memory variable specifies the highest address in memory that theC library can use for stack space. By default, a semihosting call returns top_of_memory.Stack and base are then set to be immediately below top_of_memory.RealView Debugger uses default settings for stack and base that are target-dependent.For both RVISS and ARM processors, the default setting for top_of_memory is 0x80000.When you first connect to an ARM architecture-based debug target, RealViewDebugger displays a warning message in the Cmd tab:Warning: No stack/heap or top of memory defined - setting top_of_memory to0x80000.To avoid this message, permanently set top_of_memory using the Connection Propertieswindow. Configure this for your debug target so that it is used whenever you connectwith RealView Debugger. See the chapter that describes configuring custom targets inRealView Debugger v1.8 Target Configuration Guide for details of how memory isconfigured in ARM architecture-based debug targets, and for an example of how to setup your memory map.You can set top_of_memory, and other ARM runtime controls specific to ARMprocessors, as part of a project definition. However, the available options depend onyour target processor and target vehicle.You can also set top_of_memory on a temporary basis, that is for the current session,using the @top_of_memory register. To do this select Debug → Memory/RegisterOperations → Set Register... to display the Interactive Register Setting dialog box,where the register contents can be changed.NoteIf you are using the default RVISS to simulate an ARM processor, this is not a suitabletarget for setting top_of_memory in this way.ARM DUI 0153G Copyright © 2002-2005 ARM Limited. All rights reserved. 5-13