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