gdb/testsuite/gdb.arch/amd64-lam.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3  Copyright 2023-2024 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 #define _GNU_SOURCE
  19 #include <stdint.h>
  20 #include <unistd.h>
  21 #include <stdlib.h>
  22 #include <sys/syscall.h>
  23 #include <assert.h>
  24 #include <errno.h>
  25 #include <asm/prctl.h>
  26
  27 int
  28 main (int argc, char **argv)
  29 {
  30   int i;
  31   int* pi = &i;
  32   int* pi_tagged;
  33
  34   /* Enable LAM 57.  */
  35   errno = 0;
  36   syscall (SYS_arch_prctl, ARCH_ENABLE_TAGGED_ADDR, 6);
  37   assert_perror (errno);
  38
  39   /* Add tagging at bit 61.  */
  40   pi_tagged = (int *) ((uintptr_t) pi | (1LL << 60));
  41
  42   i = 0; /* Breakpoint here.  */
  43   *pi = 1;
  44   *pi_tagged = 2;
  45   *pi = 3;
  46   *pi_tagged = 4;
  47
  48   return 0;
  49 }