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      1 /* This testcase is part of GDB, the GNU debugger.
      2 
      3    Copyright 2022-2024 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 /* Exercise AArch64's Scalable Vector Extension.
     19 
     20    This test was based on QEMU's sve-ioctls.c test file.  */
     21 
     22 #include <stdio.h>
     23 #include <sys/auxv.h>
     24 #include <sys/prctl.h>
     25 
     26 static int
     27 do_sve_ioctl_test (void)
     28 {
     29   int i, res, init_vl;
     30 
     31   res = prctl (PR_SVE_GET_VL, 0, 0, 0, 0);
     32   if (res < 0)
     33     {
     34       printf ("FAILED to PR_SVE_GET_VL (%d)", res);
     35       return -1;
     36     }
     37   init_vl = res & PR_SVE_VL_LEN_MASK;
     38 
     39   for (i = init_vl; i > 15; i /= 2)
     40     {
     41       printf ("Checking PR_SVE_SET_VL=%d\n", i);
     42       res = prctl (PR_SVE_SET_VL, i, 0, 0, 0, 0); /* break here */
     43       if (res < 0)
     44 	{
     45 	  printf ("FAILED to PR_SVE_SET_VL (%d)", res);
     46 	  return -1;
     47 	}
     48     }
     49   return 0;
     50 }
     51 
     52 int
     53 main (int argc, char **argv)
     54 {
     55   if (getauxval (AT_HWCAP) & HWCAP_SVE)
     56     {
     57       return do_sve_ioctl_test ();
     58     }
     59   else
     60     {
     61       printf ("SKIP: no HWCAP_SVE on this system\n");
     62       return 1;
     63     }
     64 }
     65