gdb/nat/x86-linux.c

   1 /* Native-dependent code for GNU/Linux x86 (i386 and x86-64).
   2
   3    Copyright (C) 1999-2019 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "common-defs.h"
  21 #include "x86-linux.h"
  22 #include "x86-linux-dregs.h"
  23
  24 /* Per-thread arch-specific data we want to keep.  */
  25
  26 struct arch_lwp_info
  27 {
  28   /* Non-zero if our copy differs from what's recorded in the
  29      thread.  */
  30   int debug_registers_changed;
  31 };
  32
  33 /* See nat/x86-linux.h.  */
  34
  35 void
  36 lwp_set_debug_registers_changed (struct lwp_info *lwp, int value)
  37 {
  38   if (lwp_arch_private_info (lwp) == NULL)
  39     lwp_set_arch_private_info (lwp, XCNEW (struct arch_lwp_info));
  40
  41   lwp_arch_private_info (lwp)->debug_registers_changed = value;
  42 }
  43
  44 /* See nat/x86-linux.h.  */
  45
  46 int
  47 lwp_debug_registers_changed (struct lwp_info *lwp)
  48 {
  49   struct arch_lwp_info *info = lwp_arch_private_info (lwp);
  50
  51   /* NULL means either that this is the main thread still going
  52      through the shell, or that no watchpoint has been set yet.
  53      The debug registers are unchanged in either case.  */
  54   if (info == NULL)
  55     return 0;
  56
  57   return info->debug_registers_changed;
  58 }
  59
  60 /* See nat/x86-linux.h.  */
  61
  62 void
  63 x86_linux_new_thread (struct lwp_info *lwp)
  64 {
  65   lwp_set_debug_registers_changed (lwp, 1);
  66 }
  67
  68 /* See nat/x86-linux.h.  */
  69
  70 void
  71 x86_linux_delete_thread (struct arch_lwp_info *arch_lwp)
  72 {
  73   xfree (arch_lwp);
  74 }
  75
  76 /* See nat/x86-linux.h.  */
  77
  78 void
  79 x86_linux_prepare_to_resume (struct lwp_info *lwp)
  80 {
  81   x86_linux_update_debug_registers (lwp);
  82 }