Some basic understanding of function calls

Short summary

Function calls operate at the CPU level through stack frames (rbp/rsp registers) that preserve execution context, with assembly-level push/pop operations, call, and ret instructions. The post walks through x86-64 examples showing how function entry, execution, and return work beneath high-level code.

• •Stack frames preserve execution context during function calls via rbp/rsp registers
• •Assembly walkthrough shows push/pop, call, and ret instructions at x86-64 level
• •Modern compilers optimize the process but the fundamental mechanism remains unchanged

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