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I have a function foo written in assembly and compiled with yasm and GCC on Linux (Ubuntu) 64-bit. It simply prints a message to stdout using puts(), here is how it looks:

bits 64

extern puts
global foo

section .data

message:
  db 'foo() called', 0

section .text

foo:
  push rbp
  mov rbp, rsp
  lea rdi, [rel message]
  call puts
  pop rbp
  ret

It is called by a C program compiled with GCC:

extern void foo();

int main() {
    foo(); …