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
  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 }