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 #include "ifunc-sel.h"
  10
  11 typedef int (*foo_p) (void);
  12 extern foo_p foo_ptr;
  13
  14 static int
  15 one (void)
  16 {
  17   return -30;
  18 }
  19
  20 void * foo_ifunc (void) __asm__ ("foo");
  21 __asm__(".type foo, %gnu_indirect_function");
  22
  23 void *
  24 foo_ifunc (void)
  25 {
  26   return ifunc_one (one);
  27 }
  28
  29 extern int foo (void);
  30 extern foo_p get_foo (void);
  31 extern foo_p get_foo_p (void);
  32
  33 foo_p my_foo_ptr = foo;
  34
  35 int
  36 main (void)
  37 {
  38   foo_p p;
  39
  40   p = get_foo ();
  41   if (p != foo)
  42     abort ();
  43   if ((*p) () != -30)
  44     abort ();
  45
  46   p = get_foo_p ();
  47   if (p != foo)
  48     abort ();
  49   if ((*p) () != -30)
  50     abort ();
  51
  52   if (foo_ptr != foo)
  53     abort ();
  54   if (my_foo_ptr != foo)
  55     abort ();
  56   if ((*foo_ptr) () != -30)
  57     abort ();
  58   if ((*my_foo_ptr) () != -30)
  59     abort ();
  60   if (foo () != -30)
  61     abort ();
  62
  63   return 0;
  64 }