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
System Call
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 |
main.s
global _start section .data msg db "hello, world!", 10 len equ $ - msg section .text _start: mov rax, 1 mov rdi, 1 mov rsi, msg mov rdx, len syscall mov rax, 60 xor rdi, rdi syscall
編譯、執行
$ nasm -f elf64 main.s $ x86_64-linux-gnu-gcc main.o -o main -nostdlib -static $ qemu-x86_64 ./main hello, world!