1  /* Copyright (C) 2008-2023 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     <https://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"