Yet another function arguments question

I have this one...

Code:

---

typedef long Function();

void test(int n1, int n2) {
  printf("%d and %d", n1, n2);
}

int main()
{
  Function *p = (Function *)test;

  int a = 1;
  int b = 2;

  asm("push %0" : "r"(a));
  asm("push %0" : "r"(b));
  (*p)();
}

---

Can anybody tell me why the output is "2 and 2"??

Is there something wrong?

I tried...

Code:

---

  asm("push %0" : "a"(a));
  asm("push %0" : "a"(b));

---

But it gave me the same result... T_T"

You could POSSIBLY do this by writing the whole call as inline assembler (using p as an argument to the inline assembler) , but otherwise, you have no idea exactly what the compiler does here, and whether it will add extra stuff on the stack (e.g. storing and restoring some register before calling the function).

--
Mats

Thanks matsp, but how to call function pointer via inline asm,...

Code:

---

asm("call %0" : "r"(p));

---

seems doesn't work.

Try "call (%0)", "r"(p)

Don't forget to clean up the stack afterwards!

--
Mats