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/* Native-dependent code for the i386.
Low level functions to implement Oeprating System specific
code to manipulate I386 debug registers.
Copyright (C) 2009-2013 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef I386_NAT_H
#define I386_NAT_H 1
/* Hardware-assisted breakpoints and watchpoints. */
/* Add watchpoint methods to the provided target_ops.
Targets using i386 family debug registers for watchpoints should call
this. */
struct target_ops;
extern void i386_use_watchpoints (struct target_ops *);
/* Support for hardware watchpoints and breakpoints using the i386
debug registers.
This provides several functions for inserting and removing
hardware-assisted breakpoints and watchpoints, testing if one or
more of the watchpoints triggered and at what address, checking
whether a given region can be watched, etc.
In addition, each target should provide several low-level functions
regrouped into i386_dr_low_type struct below. These functions
that will be called to insert watchpoints and hardware breakpoints
into the inferior, remove them, and check their status. These
functions are:
set_control -- set the debug control (DR7)
register to a given value for all LWPs
set_addr -- put an address into one debug
register for all LWPs
get_addr -- return the address in a given debug
register of the current LWP
get_status -- return the value of the debug
status (DR6) register for current LWP
get_control -- return the value of the debug
control (DR7) register for current LWP
Additionally, the native file should set the debug_register_length
field to 4 or 8 depending on the number of bytes used for
deubg registers. */
struct i386_dr_low_type
{
void (*set_control) (unsigned long);
void (*set_addr) (int, CORE_ADDR);
CORE_ADDR (*get_addr) (int);
unsigned long (*get_status) (void);
unsigned long (*get_control) (void);
int debug_register_length;
};
extern struct i386_dr_low_type i386_dr_low;
/* Debug registers' indices. */
#define DR_FIRSTADDR 0
#define DR_LASTADDR 3
#define DR_NADDR 4 /* The number of debug address registers. */
#define DR_STATUS 6 /* Index of debug status register (DR6). */
#define DR_CONTROL 7 /* Index of debug control register (DR7). */
/* Global state needed to track h/w watchpoints. */
struct i386_debug_reg_state
{
/* Mirror the inferior's DRi registers. We keep the status and
control registers separated because they don't hold addresses.
Note that since we can change these mirrors while threads are
running, we never trust them to explain a cause of a trap.
For that, we need to peek directly in the inferior registers. */
CORE_ADDR dr_mirror[DR_NADDR];
unsigned dr_status_mirror, dr_control_mirror;
/* Reference counts for each debug register. */
int dr_ref_count[DR_NADDR];
};
/* Use this function to set i386_dr_low debug_register_length field
rather than setting it directly to check that the length is only
set once. It also enables the 'maint set/show show-debug-regs'
command. */
extern void i386_set_debug_register_length (int len);
/* Use this function to reset the i386-nat.c debug register state. */
extern void i386_cleanup_dregs (void);
/* Return a pointer to the local mirror of the debug registers of
process PID. */
extern struct i386_debug_reg_state *i386_debug_reg_state (pid_t pid);
/* Called whenever GDB is no longer debugging process PID. It deletes
data structures that keep track of debug register state. */
extern void i386_forget_process (pid_t pid);
#endif /* I386_NAT_H */
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