3 ms·

I thought Linux uses sysenter/sysexit, not int 0x80/iret? Still a good tutorial; there is no magic, it's all just software.

• brenns10 10y ago
  Yes, I have a few inaccuracies I'm correcting right now. That is one of them.
• conductor 10y ago
  You are right, Linux uses INT 0x80 on x86 only when the SYSCALL/SYSENTER and SYSRET/SYSEXIT instructions are not available.