1  /* Test STT_GNU_IFUNC symbols in PIE:
       2  
       3     1. Direct function call.
       4     2. Function pointer.
       5     3. Reference from a shared library.
       6   */
       7  
       8  #include <stdlib.h>
       9  #include "ifunc-sel.h"
      10  
      11  typedef int (*foo_p) (void);
      12  
      13  static int
      14  one (void)
      15  {
      16    return -30;
      17  }
      18  
      19  void * foo_ifunc (void) __asm__ ("foo");
      20  __asm__(".type foo, %gnu_indirect_function");
      21  
      22  void *
      23  inhibit_stack_protector
      24  foo_ifunc (void)
      25  {
      26    return ifunc_one (one);
      27  }
      28  
      29  extern int foo (void);
      30  extern int call_foo (void);
      31  extern foo_p get_foo_p (void);
      32  
      33  foo_p foo_ptr = foo;
      34  
      35  int
      36  main (void)
      37  {
      38    foo_p p;
      39  
      40    if (call_foo () != -30)
      41      abort ();
      42  
      43    p = get_foo_p ();
      44    if (p != foo)
      45      abort ();
      46    if ((*p) () != -30)
      47      abort ();
      48  
      49    if (foo_ptr != foo)
      50      abort ();
      51    if ((*foo_ptr) () != -30)
      52      abort ();
      53    if (foo () != -30)
      54      abort ();
      55  
      56    return 0;
      57  }