gdb/testsuite/gdb.arch/aarch64-sve.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2022-2023 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 }