elf/ifuncmain7.c

   1 /* Test local STT_GNU_IFUNC symbols:
   2
   3    1. Direct function call.
   4    2. Function pointer.
   5  */
   6
   7 #include <stdlib.h>
   8 #include "ifunc-sel.h"
   9
  10 extern int foo (void);
  11
  12 static int
  13 one (void)
  14 {
  15   return -30;
  16 }
  17
  18 static void * foo_ifunc (void) __asm__ ("foo");
  19 __asm__(".type foo, %gnu_indirect_function");
  20
  21 static void *
  22 __attribute__ ((used))
  23 inhibit_stack_protector
  24 foo_ifunc (void)
  25 {
  26   return ifunc_one (one);
  27 }
  28
  29 typedef int (*foo_p) (void);
  30
  31 foo_p foo_ptr = foo;
  32
  33 foo_p
  34 __attribute__ ((noinline))
  35 get_foo_p (void)
  36 {
  37   return foo_ptr;
  38 }
  39
  40 foo_p
  41 __attribute__ ((noinline))
  42 get_foo (void)
  43 {
  44   return foo;
  45 }
  46
  47 int
  48 main (void)
  49 {
  50   foo_p p;
  51
  52   p = get_foo ();
  53   if (p != foo)
  54     abort ();
  55   if ((*p) () != -30)
  56     abort ();
  57
  58   p = get_foo_p ();
  59   if (p != foo)
  60     abort ();
  61   if ((*p) () != -30)
  62     abort ();
  63
  64   if (foo_ptr != foo)
  65     abort ();
  66   if ((*foo_ptr) () != -30)
  67     abort ();
  68   if (foo () != -30)
  69     abort ();
  70
  71   return 0;
  72 }