misa and hex numbers

  uint misa = 0;
  asm("csrr %0, misa" : "=r"(misa));
  printf("$misa in hex: 0x%x\n", misa);


---
C pointers

  int g = 3;

  int main() {
    int l = 5;
    int *p, *q;

    // take address of variable
    p = &g;
    q = &l;
    printf("p %p q %p\n", p, q);

    // pointer of an pointer
    int **pp;
    pp = &p;    // take address of a pointer variable
    printf("pp %p %p %d\n", pp, *pp, **pp);

    int (*f)(int, char **);
    f = &main;  // take address of a function<
    printf("main: %p\n", f);

    return 0;
  }

---
local vars on stack

  void bar() {
    int l;  // local variables don't have a default value
    printf("uninitialized local variable: %x\n", l);
  }

  void foo() {
      int xyz = 0xdeadbeef;
      printf("quit foo w/ local var = %x\n", xyz);
  }

  int main() {
      bar();
      foo();
      bar();
  }


---
ptr arithmetic

   int main() {
    char *c = (char *)0x08200000;
    int  *i = (int *) 0x08200000;

    printf("%p %p\n", (c+1), (i+1));

     return 0;
   }

---