Generate this assembly from a c program

Question

I want to generate this assembly code:

mov ecx, <absolute address of func1>
call ecx

How can I write and compile C code which generates this code?

Answer 1

Usually the compiler will generate the call using the address of the function directly. But since in your case it uses a register, it reminds me of C++ vtables. So in C, how about calling a pointer to a function? Something like this:

void (*fptr)(void);
void foo(void) {
   /* some code */
}
fptr = foo;
(*fptr)();   /* <-- your indirect call generated here */