How to print exact value of the program counter in C

Question

I want to write a C program which would print the contents of the program counter PC. Can this be done from user space, or assembly, or some specific kernel rou

Answer 1

Well I think you can get the information by inserting assembly blocks inside your C code. This will totally depend on your compiler and the register set of your platform. I did it like this:

int get_counter1()

{

    __asm__ ("lea (%rip), %eax ") ;
}

int get_counter2()

{

    int x = 0;
    __asm__ ("lea (%rip), %eax") ;
}

int main()

{

    printf("%x\n",get_counter1());
    printf("%x\n",get_counter2());
    return 0;
}

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