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 | 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 |
main.s
global _start section .data msg db "hello, world!", 10 len equ $ - msg section .text _start: push ebp mov ebp, esp mov eax, 4 mov ebx, 1 mov ecx, msg mov edx, len push ret push ecx push edx push ebp mov ebp, esp sysenter ret: mov eax, 1 mov ebx, 0 push ret push ecx push edx push ebp mov ebp, esp sysenter
編譯、執行
$ nasm -f elf32 main.s $ gcc -m32 main.o -o main -nostdlib $ ./main hello, world!
P.S. Debian x64環境測試