# ChangeStackPointer ## Description Change stack pointer. This command allows you to specify how the stack pointer (SP) is modified by the current instruction. You cannot use this command if the current instruction does not belong to any function. You will need to use this command only if IDA was not able to trace the value of the SP register. Usually IDA can handle it but in some special cases it fails. An example of such a situation is an indirect call of a function that purges its parameters from the stack. In this case, IDA has no information about the function and cannot properly trace the value of SP. Please note that you need to specify the **difference** between the old and new values of SP. The value of SP is used if the current function accesses local variables by \[ESP+xxx] notation. See also how to convert to stack variable (Action `OpStackVariable`). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.hex-rays.com/ida-actions/changestackpointer.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.