As Assembly language code runs on a CPU invoking functions and using the stack, it is clear that CPU registers are

shared resources.

Explanation:

Assembly language is a low-level language that is used commonly in programming operating systems in large systems or in single task algorithms in embedded systems.

Its files are compiled in a CPU, using available resources like registers, buses, etc. All the content of the assembly program are read and compiled before execution.

The functions and statements invoked in the program shares the resources by duplicating the content of the registers  in variables.