gdb/i386-nat.h

   1 /* Native-dependent code for the i386.
   2
   3    Low level functions to implement Oeprating System specific
   4    code to manipulate I386 debug registers.
   5
   6    Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24
  25 #ifndef I386_NAT_H
  26 #define I386_NAT_H 1
  27
  28 /* Hardware-assisted breakpoints and watchpoints.  */
  29
  30 /* Add watchpoint methods to the provided target_ops.
  31    Targets using i386 family debug registers for watchpoints should call
  32    this.  */
  33 struct target_ops;
  34 extern void i386_use_watchpoints (struct target_ops *);
  35
  36 /* Support for hardware watchpoints and breakpoints using the i386
  37    debug registers.
  38
  39    This provides several functions for inserting and removing
  40    hardware-assisted breakpoints and watchpoints, testing if one or
  41    more of the watchpoints triggered and at what address, checking
  42    whether a given region can be watched, etc.
  43
  44    In addition, each target should provide several low-level functions
  45    regrouped into i386_dr_low_type struct below.  These functions
  46    that will be called to insert watchpoints and hardware breakpoints
  47    into the inferior, remove them, and check their status.  These
  48    functions are:
  49
  50       set_control              -- set the debug control (DR7)
  51                                   register to a given value for all LWPs
  52
  53       set_addr                 -- put an address into one debug
  54                                   register for all LWPs
  55
  56       reset_addr               -- reset the address stored in
  57                                   one debug register for all LWPs
  58
  59       get_status               -- return the value of the debug
  60                                   status (DR6) register for current LWP
  61
  62       unset_status             -- unset the specified bits of the debug
  63                                   status (DR6) register for all LWPs
  64
  65    Additionally, the native file should set the debug_register_length
  66    field to 4 or 8 depending on the number of bytes used for
  67    deubg registers.  */
  68
  69 struct i386_dr_low_type
  70   {
  71     void (*set_control) (unsigned long);
  72     void (*set_addr) (int, CORE_ADDR);
  73     void (*reset_addr) (int);
  74     unsigned long (*get_status) (void);
  75     void (*unset_status) (unsigned long);
  76     int debug_register_length;
  77   };
  78
  79 extern struct i386_dr_low_type i386_dr_low;
  80
  81 /* Use this function to set i386_dr_low debug_register_length field
  82    rather than setting it directly to check that the length is only
  83    set once.  It also enables the 'maint set/show show-debug-regs'
  84    command.  */
  85
  86 extern void i386_set_debug_register_length (int len);
  87
  88 /* Use this function to reset the i386-nat.c debug register state.  */
  89
  90 extern void i386_cleanup_dregs (void);
  91
  92 #endif /* I386_NAT_H */