elf/ifuncmod1.c

   1 /* Test STT_GNU_IFUNC symbols:
   2
   3    1. Direct function call.
   4    2. Function pointer.
   5    3. Visibility.
   6  */
   7 #include "ifunc-sel.h"
   8
   9 int global = -1;
  10 /* Can't use __attribute__((visibility("protected"))) until the GCC bug:
  11
  12    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65248
  13
  14    is fixed.  */
  15 asm (".protected global");
  16
  17 static int
  18 one (void)
  19 {
  20   return 1;
  21 }
  22
  23 static int
  24 minus_one (void)
  25 {
  26   return -1;
  27 }
  28
  29 static int
  30 zero (void)
  31 {
  32   return 0;
  33 }
  34
  35 void * foo_ifunc (void) __asm__ ("foo");
  36 __asm__(".type foo, %gnu_indirect_function");
  37
  38 void *
  39 foo_ifunc (void)
  40 {
  41   return ifunc_sel (one, minus_one, zero);
  42 }
  43
  44 void * foo_hidden_ifunc (void) __asm__ ("foo_hidden");
  45 __asm__(".type foo_hidden, %gnu_indirect_function");
  46
  47 void *
  48 foo_hidden_ifunc (void)
  49 {
  50   return ifunc_sel (minus_one, one, zero);
  51 }
  52
  53 void * foo_protected_ifunc (void) __asm__ ("foo_protected");
  54 __asm__(".type foo_protected, %gnu_indirect_function");
  55
  56 void *
  57 foo_protected_ifunc (void)
  58 {
  59   return ifunc_sel (one, zero, minus_one);
  60 }
  61
  62 /* Test hidden indirect function.  */
  63 __asm__(".hidden foo_hidden");
  64
  65 /* Test protected indirect function.  */
  66 __asm__(".protected foo_protected");
  67
  68 extern int foo (void);
  69 extern int foo_hidden (void);
  70 extern int foo_protected (void);
  71 extern int ret_foo;
  72 extern int ret_foo_hidden;
  73 extern int ret_foo_protected;
  74
  75 #define FOO_P
  76 typedef int (*foo_p) (void);
  77
  78 foo_p
  79 get_foo_p (void)
  80 {
  81   ret_foo = foo ();
  82   return foo;
  83 }
  84
  85 foo_p
  86 get_foo_hidden_p (void)
  87 {
  88   ret_foo_hidden = foo_hidden ();
  89   return foo_hidden;
  90 }
  91
  92 foo_p
  93 get_foo_protected_p (void)
  94 {
  95   ret_foo_protected = foo_protected ();
  96   return foo_protected;
  97 }