GNU >> Assembly (x86)
hello, world! (int 0x80)
參考資訊：
1. syscall
2. Assembly-HOWTO
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!