參考資訊:
https://chromium.googlesource.com/chromiumos/docs/+/HEAD/constants/syscalls.md
https://reverseengineering.stackexchange.com/questions/2869/how-to-use-sysenter-under-linux
main.s
.global _start .data msg: .ascii "hello, world!\n" len = . - msg .text _start: mov $1, %rax mov $1, %rdi mov $msg, %rsi mov $len, %rdx syscall mov $60, %rax xor %rdi, %rdi syscall
NR | syscall name | rax | arg0(rdi) | arg1(rsi) | arg2(rdx) |
---|---|---|---|---|---|
1 | write | 1 | unsigned int fd | const char *buf | size_t count |
60 | exit | 60 | int error_code |
編譯、執行
$ x86_64-linux-gnu-gcc main.s -o main -static -nostdlib $ qemu-x86_64 ./main hello, world!