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121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/* Native-dependent code for the i386.
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Low level functions to implement Oeprating System specific
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code to manipulate I386 debug registers.
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Copyright (C) 2009-2012 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#ifndef I386_NAT_H
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#define I386_NAT_H 1
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/* Hardware-assisted breakpoints and watchpoints. */
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/* Add watchpoint methods to the provided target_ops.
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Targets using i386 family debug registers for watchpoints should call
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this. */
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struct target_ops;
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extern void i386_use_watchpoints (struct target_ops *);
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/* Support for hardware watchpoints and breakpoints using the i386
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debug registers.
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This provides several functions for inserting and removing
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hardware-assisted breakpoints and watchpoints, testing if one or
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more of the watchpoints triggered and at what address, checking
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whether a given region can be watched, etc.
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In addition, each target should provide several low-level functions
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regrouped into i386_dr_low_type struct below. These functions
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that will be called to insert watchpoints and hardware breakpoints
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into the inferior, remove them, and check their status. These
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functions are:
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set_control -- set the debug control (DR7)
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register to a given value for all LWPs
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set_addr -- put an address into one debug
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register for all LWPs
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get_addr -- return the address in a given debug
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register of the current LWP
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get_status -- return the value of the debug
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status (DR6) register for current LWP
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get_control -- return the value of the debug
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control (DR7) register for current LWP
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Additionally, the native file should set the debug_register_length
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field to 4 or 8 depending on the number of bytes used for
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deubg registers. */
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struct i386_dr_low_type
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{
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void (*set_control) (unsigned long);
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void (*set_addr) (int, CORE_ADDR);
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CORE_ADDR (*get_addr) (int);
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unsigned long (*get_status) (void);
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unsigned long (*get_control) (void);
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int debug_register_length;
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};
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extern struct i386_dr_low_type i386_dr_low;
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/* Debug registers' indices. */
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#define DR_FIRSTADDR 0
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#define DR_LASTADDR 3
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#define DR_NADDR 4 /* The number of debug address registers. */
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#define DR_STATUS 6 /* Index of debug status register (DR6). */
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#define DR_CONTROL 7 /* Index of debug control register (DR7). */
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/* Global state needed to track h/w watchpoints. */
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struct i386_debug_reg_state
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{
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/* Mirror the inferior's DRi registers. We keep the status and
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control registers separated because they don't hold addresses.
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Note that since we can change these mirrors while threads are
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running, we never trust them to explain a cause of a trap.
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For that, we need to peek directly in the inferior registers. */
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CORE_ADDR dr_mirror[DR_NADDR];
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unsigned dr_status_mirror, dr_control_mirror;
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/* Reference counts for each debug register. */
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int dr_ref_count[DR_NADDR];
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};
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/* Use this function to set i386_dr_low debug_register_length field
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rather than setting it directly to check that the length is only
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set once. It also enables the 'maint set/show show-debug-regs'
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command. */
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extern void i386_set_debug_register_length (int len);
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/* Use this function to reset the i386-nat.c debug register state. */
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extern void i386_cleanup_dregs (void);
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/* Return a pointer to the the local mirror of the inferior's debug
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registers. */
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extern struct i386_debug_reg_state *i386_debug_reg_state (void);
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#endif /* I386_NAT_H */
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