mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-28 12:33:36 +08:00
121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/* Native-dependent code for the i386.
|
|
|
|
Low level functions to implement Oeprating System specific
|
|
code to manipulate I386 debug registers.
|
|
|
|
Copyright (C) 2009-2012 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/>. */
|
|
|
|
#include "defs.h"
|
|
|
|
#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 the local mirror of the inferior's debug
|
|
registers. */
|
|
|
|
extern struct i386_debug_reg_state *i386_debug_reg_state (void);
|
|
|
|
#endif /* I386_NAT_H */
|