elf/ifuncmod5.c

   1 /* Test STT_GNU_IFUNC symbols without direct function call.  */
   2 #include "ifunc-sel.h"
   3
   4 int global = -1;
   5 /* Can't use __attribute__((visibility("protected"))) until the GCC bug:
   6
   7    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65248
   8
   9    is fixed.  */
  10 asm (".protected global");
  11
  12 static int
  13 one (void)
  14 {
  15   return 1;
  16 }
  17
  18 static int
  19 minus_one (void)
  20 {
  21   return -1;
  22 }
  23
  24 static int
  25 zero (void)
  26 {
  27   return 0;
  28 }
  29
  30 void * foo_ifunc (void) __asm__ ("foo");
  31 __asm__(".type foo, %gnu_indirect_function");
  32
  33 void *
  34 inhibit_stack_protector
  35 foo_ifunc (void)
  36 {
  37   return ifunc_sel (one, minus_one, zero);
  38 }
  39
  40 void * foo_hidden_ifunc (void) __asm__ ("foo_hidden");
  41 __asm__(".type foo_hidden, %gnu_indirect_function");
  42
  43 void *
  44 inhibit_stack_protector
  45 foo_hidden_ifunc (void)
  46 {
  47   return ifunc_sel (minus_one, one, zero);
  48 }
  49
  50 void * foo_protected_ifunc (void) __asm__ ("foo_protected");
  51 __asm__(".type foo_protected, %gnu_indirect_function");
  52
  53 void *
  54 inhibit_stack_protector
  55 foo_protected_ifunc (void)
  56 {
  57   return ifunc_sel (one, zero, minus_one);
  58 }
  59
  60 /* Test hidden indirect function.  */
  61 __asm__(".hidden foo_hidden");
  62
  63 /* Test protected indirect function.  */
  64 __asm__(".protected foo_protected");