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2002-02-04 Pierre Muller <muller@ics.u-strasbg.fr>

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Add support for hardware watchpoints on win32 native.
	* win32-nat.c (CONTEXT_DEBUG_DR macro): Add use of
	CONTEXT_DEBUG_REGISTERS.
	(dr variable): New variable. Static array containing a local copy
	of debug registers.
	(debug_registers_changed): New variable.  Reflects when debug registers
	are changed and need to be written to inferior.
	(debug_registers_used): New variable. Reflects when any debug register
	was set, used when new threads are created.
	(cygwin_set_dr, cygwin_set_dr7, cygwin_get_dr6): New functions used by
	i386-nat code.
	(thread_rec): Set dr array if id is the thread of current_event .
	(child_continue, child_resume): Change the debug registers for all
	threads if debug_registers_changed.
	(child_add_thread): Change the debug registers if debug_registers_used.
	* config/i386/cygwin.mh: Add use of i386-nat.o file.
	Link nm.h to new nm-cygwin.h file.
	+ config/i386/nm-cygwin.h: New file. Contains the macros used for use
	of hardware registers.
This commit is contained in:
Pierre Muller 2002-02-04 11:00:10 +00:00
parent 4fa5c2a8c0
commit fa4ba8da6c
5 changed files with 282 additions and 20 deletions
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22
gdb/ChangeLog
View File

@ -1,3 +1,25 @@
2002-02-04 Pierre Muller <muller@ics.u-strasbg.fr>
Add support for hardware watchpoints on win32 native.
* win32-nat.c (CONTEXT_DEBUG_DR macro): Add use of
CONTEXT_DEBUG_REGISTERS.
(dr variable): New variable. Static array containing a local copy
of debug registers.
(debug_registers_changed): New variable. Reflects when debug registers
are changed and need to be written to inferior.
(debug_registers_used): New variable. Reflects when any debug register
was set, used when new threads are created.
(cygwin_set_dr, cygwin_set_dr7, cygwin_get_dr6): New functions used by
i386-nat code.
(thread_rec): Set dr array if id is the thread of current_event .
(child_continue, child_resume): Change the debug registers for all
threads if debug_registers_changed.
(child_add_thread): Change the debug registers if debug_registers_used.
* config/i386/cygwin.mh: Add use of i386-nat.o file.
Link nm.h to new nm-cygwin.h file.
+ config/i386/nm-cygwin.h: New file. Contains the macros used for use
of hardware registers.
2002-02-03 Andrew Cagney <ac131313@redhat.com>
* valprint.c (print_floating): Allow non TYPE_CODE_FLT types.

4
gdb/config/i386/cygwin.mh
View File

@ -1,5 +1,5 @@
MH_CFLAGS=
XM_FILE=xm-cygwin.h
NATDEPFILES= win32-nat.o corelow.o
NAT_FILE=../none/nm-none.h
NATDEPFILES= i386-nat.o win32-nat.o corelow.o
NAT_FILE=nm-cygwin.h
XM_CLIBS=

38
gdb/config/i386/nm-cygwin.h Normal file
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@ -0,0 +1,38 @@
/* Native definitions for Intel x86 running CYGWIN.
Copyright (C) 2002 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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#define NO_PTRACE_H
#define I386_USE_GENERIC_WATCHPOINTS
#include "i386/nm-i386.h"
/* Support for hardware-assisted breakpoints and watchpoints. */
#define I386_DR_LOW_SET_CONTROL(VAL) cygwin_set_dr7 (VAL)
extern void cygwin_set_dr7 (unsigned);
#define I386_DR_LOW_SET_ADDR(N,ADDR) cygwin_set_dr (N,ADDR)
extern void cygwin_set_dr (int, CORE_ADDR);
#define I386_DR_LOW_RESET_ADDR(N)
#define I386_DR_LOW_GET_STATUS() cygwin_get_dr6 ()
extern unsigned cygwin_get_dr6 (void);

119
gdb/win32-nat.c
View File

@ -71,11 +71,15 @@ enum
#include <psapi.h>
#ifdef HAVE_SSE_REGS
#define CONTEXT_DEBUGGER_DR CONTEXT_DEBUGGER | CONTEXT_EXTENDED_REGISTERS
#define CONTEXT_DEBUGGER_DR CONTEXT_DEBUGGER | CONTEXT_DEBUG_REGISTERS \
| CONTEXT_EXTENDED_REGISTERS
#else
#define CONTEXT_DEBUGGER_DR CONTEXT_DEBUGGER
#define CONTEXT_DEBUGGER_DR CONTEXT_DEBUGGER | CONTEXT_DEBUG_REGISTERS
#endif
static unsigned dr[8];
static int debug_registers_changed = 0;
static int debug_registers_used = 0;
/* The string sent by cygwin when it processes a signal.
FIXME: This should be in a cygwin include file. */
@ -216,6 +220,15 @@ static const struct xlate_exception
{EXCEPTION_SINGLE_STEP, TARGET_SIGNAL_TRAP},
{-1, -1}};
static void
check (BOOL ok, const char *file, int line)
{
if (!ok)
printf_filtered ("error return %s:%d was %lu\n", file, line,
GetLastError ());
}
/* Find a thread record given a thread id.
If get_context then also retrieve the context for this
thread. */
@ -236,6 +249,16 @@ thread_rec (DWORD id, int get_context)
th->context.ContextFlags = CONTEXT_DEBUGGER_DR;
GetThreadContext (th->h, &th->context);
if (id == current_event.dwThreadId)
{
/* Copy dr values from that thread. */
dr[0] = th->context.Dr0;
dr[1] = th->context.Dr1;
dr[2] = th->context.Dr2;
dr[3] = th->context.Dr3;
dr[6] = th->context.Dr6;
dr[7] = th->context.Dr7;
}
}
return th;
}
@ -259,6 +282,22 @@ child_add_thread (DWORD id, HANDLE h)
th->next = thread_head.next;
thread_head.next = th;
add_thread (pid_to_ptid (id));
/* Set the debug registers for the new thread in they are used. */
if (debug_registers_used)
{
/* Only change the value of the debug registers. */
th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
CHECK (GetThreadContext (th->h, &th->context));
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
/* th->context.Dr6 = dr[6];
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr[7];
CHECK (SetThreadContext (th->h, &th->context));
th->context.ContextFlags = 0;
}
return th;
}
@ -304,13 +343,6 @@ child_delete_thread (DWORD id)
}
}
static void
check (BOOL ok, const char *file, int line)
{
if (!ok)
printf_filtered ("error return %s:%d was %lu\n", file, line, GetLastError ());
}
static void
do_child_fetch_inferior_registers (int r)
{
@ -878,11 +910,27 @@ child_continue (DWORD continue_status, int id)
for (th = &thread_head; (th = th->next) != NULL;)
if (((id == -1) || (id == (int) th->id)) && th->suspend_count)
{
for (i = 0; i < th->suspend_count; i++)
(void) ResumeThread (th->h);
th->suspend_count = 0;
if (debug_registers_changed)
{
/* Only change the value of the debug reisters */
th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
/* th->context.Dr6 = dr[6];
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr[7];
CHECK (SetThreadContext (th->h, &th->context));
th->context.ContextFlags = 0;
}
}
debug_registers_changed = 0;
return res;
}
@ -1062,10 +1110,15 @@ static void
do_initial_child_stuff (DWORD pid)
{
extern int stop_after_trap;
int i;
last_sig = 0;
event_count = 0;
exception_count = 0;
debug_registers_changed = 0;
debug_registers_used = 0;
for (i = 0; i < sizeof (dr) / sizeof (dr[0]); i++)
dr[i] = 0;
current_event.dwProcessId = pid;
memset (&current_event, 0, sizeof (current_event));
push_target (&child_ops);
@ -1345,6 +1398,7 @@ static void
child_mourn_inferior (void)
{
(void) child_continue (DBG_CONTINUE, -1);
i386_cleanup_dregs();
unpush_target (&child_ops);
generic_mourn_inferior ();
}
@ -1432,6 +1486,16 @@ child_resume (ptid_t ptid, int step, enum target_signal sig)
if (th->context.ContextFlags)
{
if (debug_registers_changed)
{
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
/* th->context.Dr6 = dr[6];
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr[7];
}
CHECK (SetThreadContext (th->h, &th->context));
th->context.ContextFlags = 0;
}
@ -1565,6 +1629,43 @@ _initialize_inftarg (void)
add_target (&child_ops);
}
/* Hardware watchpoint support, adapted from go32-nat.c code. */
/* Pass the address ADDR to the inferior in the I'th debug register.
Here we just store the address in dr array, the registers will be
actually set up when child_continue is called. */
void
cygwin_set_dr (int i, CORE_ADDR addr)
{
if (i < 0 || i > 3)
internal_error (__FILE__, __LINE__,
"Invalid register %d in cygwin_set_dr.\n", i);
dr[i] = (unsigned) addr;
debug_registers_changed = 1;
debug_registers_used = 1;
}
/* Pass the value VAL to the inferior in the DR7 debug control
register. Here we just store the address in D_REGS, the watchpoint
will be actually set up in child_wait. */
void
cygwin_set_dr7 (unsigned val)
{
dr[7] = val;
debug_registers_changed = 1;
debug_registers_used = 1;
}
/* Get the value of the DR6 debug status register from the inferior.
Here we just return the value stored in dr[6]
by the last call to thread_rec for current_event.dwThreadId id. */
unsigned
cygwin_get_dr6 (void)
{
return dr[6];
}
/* Determine if the thread referenced by "pid" is alive
by "polling" it. If WaitForSingleObject returns WAIT_OBJECT_0
it means that the pid has died. Otherwise it is assumed to be alive. */

119
gdb/windows-nat.c
View File

@ -71,11 +71,15 @@ enum
#include <psapi.h>
#ifdef HAVE_SSE_REGS
#define CONTEXT_DEBUGGER_DR CONTEXT_DEBUGGER | CONTEXT_EXTENDED_REGISTERS
#define CONTEXT_DEBUGGER_DR CONTEXT_DEBUGGER | CONTEXT_DEBUG_REGISTERS \
| CONTEXT_EXTENDED_REGISTERS
#else
#define CONTEXT_DEBUGGER_DR CONTEXT_DEBUGGER
#define CONTEXT_DEBUGGER_DR CONTEXT_DEBUGGER | CONTEXT_DEBUG_REGISTERS
#endif
static unsigned dr[8];
static int debug_registers_changed = 0;
static int debug_registers_used = 0;
/* The string sent by cygwin when it processes a signal.
FIXME: This should be in a cygwin include file. */
@ -216,6 +220,15 @@ static const struct xlate_exception
{EXCEPTION_SINGLE_STEP, TARGET_SIGNAL_TRAP},
{-1, -1}};
static void
check (BOOL ok, const char *file, int line)
{
if (!ok)
printf_filtered ("error return %s:%d was %lu\n", file, line,
GetLastError ());
}
/* Find a thread record given a thread id.
If get_context then also retrieve the context for this
thread. */
@ -236,6 +249,16 @@ thread_rec (DWORD id, int get_context)
th->context.ContextFlags = CONTEXT_DEBUGGER_DR;
GetThreadContext (th->h, &th->context);
if (id == current_event.dwThreadId)
{
/* Copy dr values from that thread. */
dr[0] = th->context.Dr0;
dr[1] = th->context.Dr1;
dr[2] = th->context.Dr2;
dr[3] = th->context.Dr3;
dr[6] = th->context.Dr6;
dr[7] = th->context.Dr7;
}
}
return th;
}
@ -259,6 +282,22 @@ child_add_thread (DWORD id, HANDLE h)
th->next = thread_head.next;
thread_head.next = th;
add_thread (pid_to_ptid (id));
/* Set the debug registers for the new thread in they are used. */
if (debug_registers_used)
{
/* Only change the value of the debug registers. */
th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
CHECK (GetThreadContext (th->h, &th->context));
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
/* th->context.Dr6 = dr[6];
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr[7];
CHECK (SetThreadContext (th->h, &th->context));
th->context.ContextFlags = 0;
}
return th;
}
@ -304,13 +343,6 @@ child_delete_thread (DWORD id)
}
}
static void
check (BOOL ok, const char *file, int line)
{
if (!ok)
printf_filtered ("error return %s:%d was %lu\n", file, line, GetLastError ());
}
static void
do_child_fetch_inferior_registers (int r)
{
@ -878,11 +910,27 @@ child_continue (DWORD continue_status, int id)
for (th = &thread_head; (th = th->next) != NULL;)
if (((id == -1) || (id == (int) th->id)) && th->suspend_count)
{
for (i = 0; i < th->suspend_count; i++)
(void) ResumeThread (th->h);
th->suspend_count = 0;
if (debug_registers_changed)
{
/* Only change the value of the debug reisters */
th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
/* th->context.Dr6 = dr[6];
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr[7];
CHECK (SetThreadContext (th->h, &th->context));
th->context.ContextFlags = 0;
}
}
debug_registers_changed = 0;
return res;
}
@ -1062,10 +1110,15 @@ static void
do_initial_child_stuff (DWORD pid)
{
extern int stop_after_trap;
int i;
last_sig = 0;
event_count = 0;
exception_count = 0;
debug_registers_changed = 0;
debug_registers_used = 0;
for (i = 0; i < sizeof (dr) / sizeof (dr[0]); i++)
dr[i] = 0;
current_event.dwProcessId = pid;
memset (&current_event, 0, sizeof (current_event));
push_target (&child_ops);
@ -1345,6 +1398,7 @@ static void
child_mourn_inferior (void)
{
(void) child_continue (DBG_CONTINUE, -1);
i386_cleanup_dregs();
unpush_target (&child_ops);
generic_mourn_inferior ();
}
@ -1432,6 +1486,16 @@ child_resume (ptid_t ptid, int step, enum target_signal sig)
if (th->context.ContextFlags)
{
if (debug_registers_changed)
{
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
/* th->context.Dr6 = dr[6];
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr[7];
}
CHECK (SetThreadContext (th->h, &th->context));
th->context.ContextFlags = 0;
}
@ -1565,6 +1629,43 @@ _initialize_inftarg (void)
add_target (&child_ops);
}
/* Hardware watchpoint support, adapted from go32-nat.c code. */
/* Pass the address ADDR to the inferior in the I'th debug register.
Here we just store the address in dr array, the registers will be
actually set up when child_continue is called. */
void
cygwin_set_dr (int i, CORE_ADDR addr)
{
if (i < 0 || i > 3)
internal_error (__FILE__, __LINE__,
"Invalid register %d in cygwin_set_dr.\n", i);
dr[i] = (unsigned) addr;
debug_registers_changed = 1;
debug_registers_used = 1;
}
/* Pass the value VAL to the inferior in the DR7 debug control
register. Here we just store the address in D_REGS, the watchpoint
will be actually set up in child_wait. */
void
cygwin_set_dr7 (unsigned val)
{
dr[7] = val;
debug_registers_changed = 1;
debug_registers_used = 1;
}
/* Get the value of the DR6 debug status register from the inferior.
Here we just return the value stored in dr[6]
by the last call to thread_rec for current_event.dwThreadId id. */
unsigned
cygwin_get_dr6 (void)
{
return dr[6];
}
/* Determine if the thread referenced by "pid" is alive
by "polling" it. If WaitForSingleObject returns WAIT_OBJECT_0
it means that the pid has died. Otherwise it is assumed to be alive. */