136 lines
5.0 KiB
C
136 lines
5.0 KiB
C
/* Debug register code for x86 (i386 and x86-64).
|
|
|
|
Copyright (C) 2009-2018 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/>. */
|
|
|
|
/* Support for hardware watchpoints and breakpoints using the x86
|
|
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.
|
|
|
|
The functions below implement debug registers sharing by reference
|
|
counts, and allow to watch regions up to 16 bytes long
|
|
(32 bytes on 64 bit hosts). */
|
|
|
|
#ifndef X86_DREGS_H
|
|
#define X86_DREGS_H 1
|
|
|
|
#include "break-common.h" /* target_hw_bp_type */
|
|
|
|
/* Low-level function vector. */
|
|
|
|
struct x86_dr_low_type
|
|
{
|
|
/* Set the debug control (DR7) register to a given value for
|
|
all LWPs. May be NULL if the debug control register cannot
|
|
be set. */
|
|
void (*set_control) (unsigned long);
|
|
|
|
/* Put an address into one debug register for all LWPs. May
|
|
be NULL if debug registers cannot be set*/
|
|
void (*set_addr) (int, CORE_ADDR);
|
|
|
|
/* Return the address in a given debug register of the current
|
|
LWP. */
|
|
CORE_ADDR (*get_addr) (int);
|
|
|
|
/* Return the value of the debug status (DR6) register for
|
|
current LWP. */
|
|
unsigned long (*get_status) (void);
|
|
|
|
/* Return the value of the debug control (DR7) register for
|
|
current LWP. */
|
|
unsigned long (*get_control) (void);
|
|
|
|
/* Number of bytes used for debug registers (4 or 8). */
|
|
int debug_register_length;
|
|
};
|
|
|
|
extern struct x86_dr_low_type x86_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 x86_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 address register. */
|
|
int dr_ref_count[DR_NADDR];
|
|
};
|
|
|
|
/* A macro to loop over all debug address registers. */
|
|
#define ALL_DEBUG_ADDRESS_REGISTERS(i) \
|
|
for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
|
|
|
|
/* Return a pointer to the local mirror of the debug registers of
|
|
process PID. This function must be provided by the client
|
|
if required. */
|
|
extern struct x86_debug_reg_state *x86_debug_reg_state (pid_t pid);
|
|
|
|
/* Insert a watchpoint to watch a memory region which starts at
|
|
address ADDR and whose length is LEN bytes. Watch memory accesses
|
|
of the type TYPE. Return 0 on success, -1 on failure. */
|
|
extern int x86_dr_insert_watchpoint (struct x86_debug_reg_state *state,
|
|
enum target_hw_bp_type type,
|
|
CORE_ADDR addr,
|
|
int len);
|
|
|
|
/* Remove a watchpoint that watched the memory region which starts at
|
|
address ADDR, whose length is LEN bytes, and for accesses of the
|
|
type TYPE. Return 0 on success, -1 on failure. */
|
|
extern int x86_dr_remove_watchpoint (struct x86_debug_reg_state *state,
|
|
enum target_hw_bp_type type,
|
|
CORE_ADDR addr,
|
|
int len);
|
|
|
|
/* Return non-zero if we can watch a memory region that starts at
|
|
address ADDR and whose length is LEN bytes. */
|
|
extern int x86_dr_region_ok_for_watchpoint (struct x86_debug_reg_state *state,
|
|
CORE_ADDR addr, int len);
|
|
|
|
/* If the inferior has some break/watchpoint that triggered, set the
|
|
address associated with that break/watchpoint and return true.
|
|
Otherwise, return false. */
|
|
extern int x86_dr_stopped_data_address (struct x86_debug_reg_state *state,
|
|
CORE_ADDR *addr_p);
|
|
|
|
/* Return true if the inferior has some watchpoint that triggered.
|
|
Otherwise return false. */
|
|
extern int x86_dr_stopped_by_watchpoint (struct x86_debug_reg_state *state);
|
|
|
|
/* Return true if the inferior has some hardware breakpoint that
|
|
triggered. Otherwise return false. */
|
|
extern int x86_dr_stopped_by_hw_breakpoint (struct x86_debug_reg_state *state);
|
|
|
|
#endif /* X86_DREGS_H */
|