1) You don't... hence, my question about no nested function calls. If you push it anywhere else, you can call it whatever you want, but you just re-invented the stack. I _guess_ you could do some wierd stuff to technically not get a stack, but... again, it's wierd. And for what, again?
2) Some fixed address. If you have for example:
```c
typeRealBigStructure foo;
void baz(typeRealBigStructure * struct){
// Do whatever to struct
void bar(void){
baz(&foo);
```
The foo will probably end up in the BSS and will take up that space for the whole lifetime of the program. That's not the heap, not the stack, just... a fixed location in memory where the linker placed it.
I guess on big PC's stuff is very dynamic and you use malloc for a lot of stuff, but in embedded C, it's a very common pattern.
1. Where do you save the current value of the return address register before calling a function?
2. When parameters are "grouped into a structure" and the structure is passed as an argument to a function, where do you store that structure?