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I write a new system call and compile to a new kernel and run it in QEMU successfully.

For now, I need to write a small program to test the new system call.

How do I compile it in the new kernel which run on the QEMU for ARM platform?

If you're that far with a kernel on ARM you should know that (if you're not copy & pasting all the time).

The title "Compile a program in QEMU" made me laugh and think "what a noob", so try to choose better ones.

Here's the link to the wiki everyone loves to post on that kind of a topic: Required Knowledge (especially number 10 should be interesting fo you).

I guess that you need to implement a file system and an elf loader to find and execute your application, see that: http://www.jamesmolloy.co.uk/tutorial_h ... nitrd.html.