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

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2009-2017 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 int
  27 final (int arg)
  28 {
  29   return arg + 1;
  30 }
  31
  32 /* Make differentiation of how the gnu_ifunc call resolves before and after
  33    calling gnu_ifunc_pre.  This ensures the resolved function address is not
  34    being cached anywhere for the debugging purposes.  */
  35
  36 volatile int gnu_ifunc_initialized;
  37
  38 /* This stores the argument received by the ifunc resolver.  */
  39
  40 volatile unsigned long resolver_hwcap = -1;
  41
  42 static void
  43 gnu_ifunc_pre (void)
  44 {
  45   assert (!gnu_ifunc_initialized);
  46
  47   gnu_ifunc_initialized = 1;
  48 }
  49
  50 extern int gnu_ifunc (int arg);
  51
  52 int
  53 main (void)
  54 {
  55   int i;
  56
  57   gnu_ifunc_pre ();
  58
  59   i = gnu_ifunc (1);    /* break-at-call */
  60   assert (i == 2);
  61
  62   gnu_ifunc (2);        /* break-at-nextcall */
  63
  64   return 0;     /* break-at-exit */
  65 }