elf/ifuncmain6pie.c

   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
  10 typedef int (*foo_p) (void);
  11 extern foo_p foo_ptr;
  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 foo_ifunc (void)
  24 {
  25   return one;
  26 }
  27
  28 extern int foo (void);
  29 extern foo_p get_foo (void);
  30 extern foo_p get_foo_p (void);
  31
  32 foo_p my_foo_ptr = foo;
  33
  34 int
  35 main (void)
  36 {
  37   foo_p p;
  38
  39   p = get_foo ();
  40   if (p != foo)
  41     abort ();
  42   if ((*p) () != -30)
  43     abort ();
  44
  45   p = get_foo_p ();
  46   if (p != foo)
  47     abort ();
  48   if ((*p) () != -30)
  49     abort ();
  50
  51   if (foo_ptr != foo)
  52     abort ();
  53   if (my_foo_ptr != foo)
  54     abort ();
  55   if ((*foo_ptr) () != -30)
  56     abort ();
  57   if ((*my_foo_ptr) () != -30)
  58     abort ();
  59   if (foo () != -30)
  60     abort ();
  61
  62   return 0;
  63 }