loading and executing a binary image (user mode) from memory

["Dannie Gay" <dang@broadcom.com>]

Need assistance with this embedded linux project:

I want to decompress (from flash) a application into memory and execute it.
Ideally I want to simply jump to the starting location and run.  I've
already successfully allocated the required amount of memory (on bootup)
with alloc_bootmem_pages() from the kernel and decompress the image from
flash and load it into my allocated memory (free from kernel tampering).
My user mode application loads from a small initial ram disk, maps the
allocated memory into my process space and marks it as read/execute via mmap
PROT_READ|PROT_EXEC.  The problem is what kind of binary image is required
to be built which would allow simply jumping to this location?  Can a
particular binary image be built with gcc that is possition independant and
free from the file system requirements imposed upon do_execve?

I'm stuck here, has anyone done this sort of thing?

thanks,

dang




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