Tiniest possible FeOS app

main.s

.arch armv5te

.section .init
.global __entrypoint
.hidden __entrypoint

.align 2

@ This word-sized space is reserved by the OS.
.word 0

@ r0 - word_t event
@ r1 - word_t prm1
@ r2 - word_t prm2
@ r3 - word_t prm3
.thumb_func
__entrypoint:
	mov r0, #0
	bx lr