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 inhibit_stack_protector
  25 foo_ifunc (void)
  26 {
  27   return ifunc_one (one);
  28 }
  29
  30 extern int foo (void);
  31 extern foo_p get_foo (void);
  32 extern foo_p get_foo_p (void);
  33
  34 foo_p my_foo_ptr = foo;
  35
  36 int
  37 main (void)
  38 {
  39   foo_p p;
  40
  41   p = get_foo ();
  42   if (p != foo)
  43     abort ();
  44   if ((*p) () != -30)
  45     abort ();
  46
  47   p = get_foo_p ();
  48   if (p != foo)
  49     abort ();
  50   if ((*p) () != -30)
  51     abort ();
  52
  53   if (foo_ptr != foo)
  54     abort ();
  55   if (my_foo_ptr != foo)
  56     abort ();
  57   if ((*foo_ptr) () != -30)
  58     abort ();
  59   if ((*my_foo_ptr) () != -30)
  60     abort ();
  61   if (foo () != -30)
  62     abort ();
  63
  64   return 0;
  65 }