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

On ARM, you can use:

static __inline__ void * get_pc(void)  {
    void *pc;
    asm("mov %0, pc" : "=r"(pc));
    return pc;
}

Or this one should work as well:

static __inline__ void * get_pc(void) {
    register void * pc __asm__("pc");
    __asm__("" : "=r"(pc));
    return pc;
}

The forced inlining is important here, because that ensures you retrieve PC as per the call site.

Edit: just remembered, __current_pc() ARM intrinsic. GCC should have this as well.