參考資訊：
https://flatassembler.net/index.php
https://gist.github.com/bellbind/753290
https://syscalls.w3challs.com/?arch=arm_strong
http://kerseykyle.com/articles/ARM-assembly-hello-world
https://github.com/kevinhooke/learning-arm-asm/blob/master/helloworld.s
https://stackoverflow.com/questions/48183434/implementation-of-syscall-on-arm-oabi-what-is-svc-0x900071
System Call (OABI)
| NR | syscall name | arg0(r0) | arg1(r1) | arg2(r2) |
|---|---|---|---|---|
| 0x900001 | exit | int error_code | ||
| 0x900004 | write | unsigned int fd | const char *buf | size_t count |
main.s
format elf executable 3
entry start
segment readable executable
start:
mov r0, 1
mov r1, msg
mov r2, len
swi 0x900004
mov r0, 0
swi 0x900001
segment readable writeable
msg db "hello, world!", 10
len = $ - msg
編譯、執行
$ qemu-i386 /usr/local/bin/fasmarm main.s
$ qemu-arm-static ./main
hello, world!