stdlib/tst-makecontext2.c

   1 /* Copyright (C) 2008-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stdlib.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <ucontext.h>
  23 #include <tst-stack-align.h>
  24
  25 ucontext_t ucp, ucp2;
  26 char st1[262144] __attribute__((aligned (16)));
  27
  28 void
  29 cf (int i, int j)
  30 {
  31   if (i != 78 || j != 274)
  32     {
  33       printf ("i %d j %d\n", i, j);
  34       exit (1);
  35     }
  36   else if (TEST_STACK_ALIGN ())
  37     {
  38       puts ("insufficiently aligned stack");
  39       exit (2);
  40     }
  41 }
  42
  43 int
  44 do_test (void)
  45 {
  46   for (size_t j = 32; j < 64; j += sizeof (long))
  47     {
  48       if (getcontext (&ucp) != 0)
  49         {
  50           if (errno == ENOSYS)
  51             {
  52               puts ("context handling not supported");
  53               return 0;
  54             }
  55
  56           puts ("getcontext failed");
  57           return 1;
  58         }
  59       ucp.uc_link = &ucp2;
  60       ucp.uc_stack.ss_sp = st1;
  61       ucp.uc_stack.ss_size = sizeof (st1) - j;
  62       memset (&st1[sizeof (st1) - j], 0x55, j);
  63       makecontext (&ucp, (void (*) (void)) cf, 2, 78, 274);
  64       if (swapcontext (&ucp2, &ucp) != 0)
  65         {
  66           puts ("setcontext failed");
  67           return 1;
  68         }
  69
  70       for (size_t i = j; i > 0; i--)
  71         if (st1[sizeof (st1) - j + i - 1] != 0x55)
  72           { printf ("fail %zd %zd\n", i, j); break; }
  73     }
  74
  75   return 0;
  76 }
  77
  78 #define TEST_FUNCTION do_test ()
  79 #include "../test-skeleton.c"