stdlib/tst-makecontext2.c

   1 /* Copyright (C) 2008 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <ucontext.h>
  24 #include <tst-stack-align.h>
  25
  26 ucontext_t ucp, ucp2;
  27 char st1[262144] __attribute__((aligned (16)));
  28
  29 void
  30 cf (int i, int j)
  31 {
  32   if (i != 78 || j != 274)
  33     {
  34       printf ("i %d j %d\n", i, j);
  35       exit (1);
  36     }
  37   else if (TEST_STACK_ALIGN ())
  38     {
  39       puts ("insufficiently aligned stack");
  40       exit (2);
  41     }
  42 }
  43
  44 int
  45 do_test (void)
  46 {
  47   for (size_t j = 32; j < 64; j += sizeof (long))
  48     {
  49       if (getcontext (&ucp) != 0)
  50         {
  51           if (errno == ENOSYS)
  52             {
  53               puts ("context handling not supported");
  54               return 0;
  55             }
  56
  57           puts ("getcontext failed");
  58           return 1;
  59         }
  60       ucp.uc_link = &ucp2;
  61       ucp.uc_stack.ss_sp = st1;
  62       ucp.uc_stack.ss_size = sizeof (st1) - j;
  63       memset (&st1[sizeof (st1) - j], 0x55, j);
  64       makecontext (&ucp, (void (*) (void)) cf, 2, 78, 274);
  65       if (swapcontext (&ucp2, &ucp) != 0)
  66         {
  67           puts ("setcontext failed");
  68           return 1;
  69         }
  70
  71       for (size_t i = j; i > 0; i--)
  72         if (st1[sizeof (st1) - j + i - 1] != 0x55)
  73           { printf ("fail %zd %zd\n", i, j); break; }
  74     }
  75
  76   return 0;
  77 }
  78
  79 #define TEST_FUNCTION do_test ()
  80 #include "../test-skeleton.c"