Determining appropriate register when POPing value from stack?

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I'm learning more about assembly language, and I see instructions like:

PUSH EAX;
POP ESP;

...which apparently pushes EAX onto the stack, and pops it back into the ESP register.

Are values tagged with the source register in some way on the stack? For example, is there some way of knowing that the value of EAX that ends up on the stack came from EAX?

If the value of EAX is incompatible with the ESP register, and it gets POPed into ESP, what happens?

asked 14 secs ago

juwiley

3,235

Determining appropriate register when POPing value from stack?