When Linux loads your program it actually puts quite a bit of stuff on the stack. The first thing it puts is the argc followed by an array of argv pointers, fol

When Linux loads your program it actually puts quite a bit of stuff on the stack. The first thing it puts is the argc followed by an array of argv pointers, followed by a zero. After that it puts the environment variables, followed by a zero. And then it puts the aux-vector, which contains lots of useful things. And that's where you could pass the address of a system call translation/jump table. This aux-vector is already used to enable multi-threading, because it contains the necessary information to create the thread-local storage. One drawback here is that your simple hello-world write/printf in assembly becomes complicated, because you need to get the table address so you can access the write/exit information. As far as what this would help for security, I have no idea, other than making it harder to exploit cases where you don't have a lot of room. We don't hear a lot about all the exploits that didn't happen because of all the extra hoops you have to jump through with each change over the years.