elf/ifuncmain3.c

   1 /* Test STT_GNU_IFUNC symbols with dlopen:
   2
   3    1. Direct function call.
   4    2. Function pointer.
   5    3. Visibility with override.
   6  */
   7
   8 #include <dlfcn.h>
   9 #include <stdlib.h>
  10 #include <stdio.h>
  11
  12 typedef int (*foo_p) (void);
  13
  14 int
  15 __attribute__ ((noinline))
  16 foo (void)
  17 {
  18   return -30;
  19 }
  20
  21 int
  22 __attribute__ ((noinline))
  23 foo_hidden (void)
  24 {
  25   return -20;
  26 }
  27
  28 int
  29 __attribute__ ((noinline))
  30 foo_protected (void)
  31 {
  32   return -40;
  33 }
  34
  35 int
  36 main (void)
  37 {
  38   foo_p p;
  39   foo_p (*f) (void);
  40   int *ret;
  41
  42   void *h = dlopen ("ifuncmod3.so", RTLD_LAZY);
  43   if (h == NULL)
  44     {
  45       printf ("cannot load: %s\n", dlerror ());
  46       return 1;
  47     }
  48
  49   p = dlsym (h, "foo");
  50   if (p == NULL)
  51     {
  52       printf ("symbol not found: %s\n", dlerror ());
  53       return 1;
  54     }
  55   if ((*p) () != -1)
  56     abort ();
  57
  58   f = dlsym (h, "get_foo_p");
  59   if (f == NULL)
  60     {
  61       printf ("symbol not found: %s\n", dlerror ());
  62       return 1;
  63     }
  64
  65   ret = dlsym (h, "ret_foo");
  66   if (ret == NULL)
  67     {
  68       printf ("symbol not found: %s\n", dlerror ());
  69       return 1;
  70     }
  71
  72   p = (*f) ();
  73   if (p != foo)
  74     abort ();
  75   if (foo () != -30)
  76     abort ();
  77   if (*ret != -30 || (*p) () != *ret)
  78     abort ();
  79
  80   f = dlsym (h, "get_foo_hidden_p");
  81   if (f == NULL)
  82     {
  83       printf ("symbol not found: %s\n", dlerror ());
  84       return 1;
  85     }
  86
  87   ret = dlsym (h, "ret_foo_hidden");
  88   if (ret == NULL)
  89     {
  90       printf ("symbol not found: %s\n", dlerror ());
  91       return 1;
  92     }
  93
  94   p = (*f) ();
  95   if (foo_hidden () != -20)
  96     abort ();
  97   if (*ret != 1 || (*p) () != *ret)
  98     abort ();
  99
 100   f = dlsym (h, "get_foo_protected_p");
 101   if (f == NULL)
 102     {
 103       printf ("symbol not found: %s\n", dlerror ());
 104       return 1;
 105     }
 106
 107   ret = dlsym (h, "ret_foo_protected");
 108   if (ret == NULL)
 109     {
 110       printf ("symbol not found: %s\n", dlerror ());
 111       return 1;
 112     }
 113
 114   p = (*f) ();
 115   if (p == foo_protected)
 116     abort ();
 117   if (foo_protected () != -40)
 118     abort ();
 119   if (*ret != 0 || (*p) () != *ret)
 120     abort ();
 121
 122   if (dlclose (h) != 0)
 123     {
 124       printf ("cannot close: %s\n", dlerror ());
 125       return 1;
 126     }
 127
 128   return 0;
 129 }