程式語言 - GNU - Assembly (x86) - Hello, world!(sysenter)



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:
    push %ebp
    mov %esp, %ebp

    mov $4, %eax
    mov $1, %ebx
    mov $msg, %ecx
    mov $len, %edx
    push $final
    push %ecx
    push %edx
    push %ebp
    mov %esp, %ebp
    sysenter

final:
    mov $1, %eax
    mov $0, %ebx
    push $final
    push %ecx
    push %edx
    push %ebp
    mov %esp, %ebp
    sysenter

NRsyscall nameeaxarg0(ebx)arg1(ecx)arg2(edx)
1exit1int error_code
4write4unsigned int fdconst char *bufsize_t count

編譯、執行

$ gcc -m32 main.s -o main -nostdlib
$ ./main
    hello, world!

P.S. Debian x64環境測試