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!