gdb/nat/aarch64-linux.c

   1 /* Copyright (C) 2009-2015 Free Software Foundation, Inc.
   2    Contributed by ARM Ltd.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "common-defs.h"
  20 #include "break-common.h"
  21 #include "nat/linux-nat.h"
  22 #include "nat/aarch64-linux-hw-point.h"
  23 #include "nat/aarch64-linux.h"
  24
  25 /* Called when resuming a thread LWP.
  26    The hardware debug registers are updated when there is any change.  */
  27
  28 void
  29 aarch64_linux_prepare_to_resume (struct lwp_info *lwp)
  30 {
  31   struct arch_lwp_info *info = lwp_arch_private_info (lwp);
  32
  33   /* NULL means this is the main thread still going through the shell,
  34      or, no watchpoint has been set yet.  In that case, there's
  35      nothing to do.  */
  36   if (info == NULL)
  37     return;
  38
  39   if (DR_HAS_CHANGED (info->dr_changed_bp)
  40       || DR_HAS_CHANGED (info->dr_changed_wp))
  41     {
  42       ptid_t ptid = ptid_of_lwp (lwp);
  43       int tid = ptid_get_lwp (ptid);
  44       struct aarch64_debug_reg_state *state
  45         = aarch64_get_debug_reg_state (ptid_get_pid (ptid));
  46
  47       if (show_debug_regs)
  48         debug_printf ("prepare_to_resume thread %d\n", tid);
  49
  50       /* Watchpoints.  */
  51       if (DR_HAS_CHANGED (info->dr_changed_wp))
  52         {
  53           aarch64_linux_set_debug_regs (state, tid, 1);
  54           DR_CLEAR_CHANGED (info->dr_changed_wp);
  55         }
  56
  57       /* Breakpoints.  */
  58       if (DR_HAS_CHANGED (info->dr_changed_bp))
  59         {
  60           aarch64_linux_set_debug_regs (state, tid, 0);
  61           DR_CLEAR_CHANGED (info->dr_changed_bp);
  62         }
  63     }
  64 }
  65
  66 /* Function to call when a new thread is detected.  */
  67
  68 void
  69 aarch64_linux_new_thread (struct lwp_info *lwp)
  70 {
  71   struct arch_lwp_info *info = xcalloc (1, sizeof (*info));
  72
  73   /* Mark that all the hardware breakpoint/watchpoint register pairs
  74      for this thread need to be initialized (with data from
  75      aarch_process_info.debug_reg_state).  */
  76   DR_MARK_ALL_CHANGED (info->dr_changed_bp, aarch64_num_bp_regs);
  77   DR_MARK_ALL_CHANGED (info->dr_changed_wp, aarch64_num_wp_regs);
  78
  79   lwp_set_arch_private_info (lwp, info);
  80 }