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      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 }
     50