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

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2009-2020 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 #include <assert.h>
  19
  20 int
  21 init_stub (int arg)
  22 {
  23   return 0;
  24 }
  25
  26 /* Make differentiation of how the gnu_ifunc call resolves before and after
  27    calling gnu_ifunc_pre.  This ensures the resolved function address is not
  28    being cached anywhere for the debugging purposes.  */
  29
  30 volatile int gnu_ifunc_initialized;
  31
  32 /* This stores the argument received by the ifunc resolver.  */
  33
  34 volatile unsigned long resolver_hwcap = -1;
  35
  36 static void
  37 gnu_ifunc_pre (void)
  38 {
  39   assert (!gnu_ifunc_initialized);
  40
  41   gnu_ifunc_initialized = 1;
  42 }
  43
  44 extern int gnu_ifunc (int arg);
  45
  46 int
  47 main (void)
  48 {
  49   int i;
  50
  51   gnu_ifunc_pre ();
  52
  53   i = gnu_ifunc (1);    /* break-at-call */
  54   assert (i == 2);
  55
  56   gnu_ifunc (2);        /* break-at-nextcall */
  57
  58   return 0;     /* break-at-exit */
  59 }