[raxxorrax]

Did it ever change the last 15 years for linux or windows systems? There are additional commands and perhaps some rules changed about which register need parameters and which need to be saved. But I cannot remember fundamental changes here.

[ChrisSD]

Note that a "syscall" means calling into the kernel directly. Only Linux has stable syscalls.

As mentioned below, on Windows syscalls are highly unstable. They change with every single update to the OS. You have to call functions in ntdll and they in turn will call the kernel. Think of it like a kind of libc but one that must be dynamically linked. You can't statically link it because it's tied to the exact version of Windows you're using.

Of course Window's actual stable interface is the Win32 API, which will call ntdll which in turn makes the syscall.

[raxxorrax]

They don't have them documented, but I didn't think they changed that much. But apparently they did. Just found this neat site:

https://j00ru.vexillium.org/syscalls/nt/64/

[ChrisSD]

Note that they can potentially change with every single update to the OS. That's why that site lists the syscall for every update. They are not stable.