Shortest possible GAS ARM (linux) program?

Question

I\'ve toyed with the idea of learning an assembly language, and have decided to give ARM a try. I\'ve decided to go with the GNU assembler, mostly because it\'s available in my

Answer 1

There is some information on system calls at http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=3105/4. You can also look at page 5 of http://isec.pl/papers/into_my_arms_dsls.pdf.

Answer 2

teensy.s

.global _start
.thumb_func
_start:
    mov r0, #42
    mov r7, #1
    svc #0

Makefile

CROSS_COMPILE?=arm-linux-gnueabihf-

teensy:
    $(CROSS_COMPILE)as teensy.s -o teensy.o
    $(CROSS_COMPILE)ld teensy.o -o teensy
    ls -l teensy
    $(CROSS_COMPILE)objdump -d teensy.o
    $(CROSS_COMPILE)readelf -W -a teensy

clean:
    rm teensy teensy.o