1 /* Native-dependent code for the i386.
3 Low level functions to implement Oeprating System specific
4 code to manipulate I386 debug registers.
6 Copyright (C) 2009, 2010 Free Software Foundation, Inc.
8 This file is part of GDB.
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.
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.
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/>. */
28 /* Hardware-assisted breakpoints and watchpoints. */
30 /* Add watchpoint methods to the provided target_ops.
31 Targets using i386 family debug registers for watchpoints should call
34 extern void i386_use_watchpoints (struct target_ops *);
36 /* Support for hardware watchpoints and breakpoints using the i386
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.
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
50 set_control -- set the debug control (DR7)
51 register to a given value for all LWPs
53 set_addr -- put an address into one debug
56 reset_addr -- reset the address stored in
57 one debug register for all LWPs
59 get_status -- return the value of the debug
60 status (DR6) register for current LWP
62 unset_status -- unset the specified bits of the debug
63 status (DR6) register for all LWPs
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
69 struct i386_dr_low_type
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;
79 extern struct i386_dr_low_type i386_dr_low;
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'
86 extern void i386_set_debug_register_length (int len);
88 /* Use this function to reset the i386-nat.c debug register state. */
90 extern void i386_cleanup_dregs (void);
92 #endif /* I386_NAT_H */