gdb/testsuite/gdb.base/gnu-ifunc-lib.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2009-2021 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 extern volatile int gnu_ifunc_initialized;
  19 extern volatile unsigned long resolver_hwcap;
  20 extern int init_stub (int arg);
  21 extern int final (int arg);
  22
  23 typedef int (*final_t) (int arg);
  24
  25 #ifndef IFUNC_RESOLVER_ATTR
  26 asm (".type gnu_ifunc, %gnu_indirect_function");
  27 final_t
  28 gnu_ifunc (unsigned long hwcap)
  29 #else
  30 final_t
  31 gnu_ifunc_resolver (unsigned long hwcap)
  32 #endif
  33 {
  34   resolver_hwcap = hwcap;
  35   if (! gnu_ifunc_initialized)
  36     return init_stub;
  37   else
  38     return final;
  39 }
  40
  41 #ifdef IFUNC_RESOLVER_ATTR
  42 extern int gnu_ifunc (int arg);
  43
  44 __typeof (gnu_ifunc) gnu_ifunc __attribute__ ((ifunc ("gnu_ifunc_resolver")));
  45 #endif