embedded - How to get a process variable value from a map file address in Linux

Question

For example, if I have a map file like this, 　0x00001000 _hoge how do I get the value of the variable "hoge" from this address(0x00001000) in a process running in Linux?

In the case of a normal (without OS) embedded program, it is processed only by the physical address, so I think that the following code is fine. 　value = (*(volatile unsigned int*)0x00001000)

On the other hand, process running in Linux use virtual addresses, so I don't think this method works.

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This is a story in an environment where linux is embedded in a microcomputer. I use the programming language c(gcc). The purpose is to create a function that sends the address described in the mapfile to the microcomputer from the outside and sends back the value of the corresponding variable.

question from:https://stackoverflow.com/questions/65924712/how-to-get-a-process-variable-value-from-a-map-file-address-in-linux

Answer 1

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