參考資訊:
https://tldp.org/HOWTO/Assembly-HOWTO/hello.html
https://chromium.googlesource.com/chromiumos/docs/+/HEAD/constants/syscalls.md
main.s
.global _start .data msg: .ascii "hello, world!\n" len = . - msg .text _start: mov $4, %eax mov $1, %ebx mov $msg, %ecx mov $len, %edx int $0x80 mov $1, %eax mov $0, %ebx int $0x80
NR | syscall name | eax | arg0(ebx) | arg1(ecx) | arg2(edx) |
---|---|---|---|---|---|
1 | exit | 1 | int error_code | ||
4 | write | 4 | unsigned int fd | const char *buf | size_t count |
編譯、執行
$ i686-linux-gnu-gcc main.s -o main -static -nostdlib $ qemu-i386 ./main hello, world!