The cruise starts

One of my projects involve dynamic updating of kernel code on sensors running the Contiki OS. It seems there are many ways to do this, as shown in this presentation and supporting .pdf by Adam Dunkels et al. The Contiki layers and linking relationships are explained in detail in this and this document.

Wikipedia has a good overview of ELF, a very popular structure for dynamically linked modules. A hallo-world example from LinuxJournal (1995) is also a good starting point. This excellent tutorial shows how to use ELF when compiling really small ASM files (includes a specification of ELF), while this site explains in detail how the ELF structure is implemented using C libraries.