File 1exit.dmp:
https://dacvs.neocities.org/1exit.html
Make script:
https://dacvs.neocities.org/make.html
Wikipedia on ELF:
https://en.wikipedia.org/wiki/Executable_and_Linkable_Format
System V ABI:
http://www.sco.com/developers/devspecs/gabi41.pdf
System V ABI supplement 386:
http://www.sco.com/developers/devspecs/abi386-4.pdf
Registers for syscall parameters are listed here:
https://en.wikibooks.org/wiki/X86_Assembly/Interfacing_with_Linux#Via_interrupt
Linux's transition from a.out format to ELF is described here:
https://akkadia.org/drepper/dsohowto.pdf