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gdb/gdb-6.3-threaded-watchpoints2-20050225.patch
Jan Kratochvil eb9d945afa - Upgrade to GDB 6.7. Drop redundant patches, forward-port remaining ones. 
- Fix rereading of the main executable on its change.
2007-11-01 20:24:20 +00:00

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2005-02-28 Jeff Johnston <jjohnstn@redhat.com>
* config/i386/nm-linux.h: Change dr register routines to
accept a ptid_t first argument. Change all calling macros
to default the inferior_ptid for the first argument.
(i386_linux_insert_watchpoint): New prototype.
(i386_linux_remove_watchpoint, i386_linux_insert_hw_breakpoint): Ditto.
(i386_linux_remove_hw_breakpoint): Ditto.
(target_insert_watchpoint, target_remove_watchpoint): Undef and
override.
(target_insert_hw_breakpoint, target_remove_hw_breakpoint): Ditto.
* config/i386/nm-linux64.h: Ditto except add amd64 versions of
the watchpoint/hw-breakpoint insert/remove routines.
* i386-nat.c: Include "inferior.h" to define inferior_ptid.
* i386-linux-nat.c: Change all dr get/set routines to accept
ptid_t as first argument and to use this argument to determine
the tid for PTRACE.
(i386_linux_set_debug_regs_for_thread): New function.
(i386_linux_sync_debug_registers_callback): Ditto.
(i386_linux_sync_debug_registers_across_threads): Ditto.
(i386_linux_insert_watchpoint, i386_linux_remove_watchpoint): Ditto.
(i386_linux_hw_breakpoint, i386_linux_remove_hw_breakpoint): Ditto.
(i386_linux_new_thread): Ditto.
(_initialize_i386_linux_nat): Ditto.
* amd64-linux-nat.c: Change all dr get/set routines to accept
ptid_t as first argument and to use this argument to determine
the tid for PTRACE.
(amd64_linux_set_debug_regs_for_thread): New function.
(amd64_linux_sync_debug_registers_callback): Ditto.
(amd64_linux_sync_debug_registers_across_threads): Ditto.
(amd64_linux_insert_watchpoint, amd64_linux_remove_watchpoint): Ditto.
(amd64_linux_hw_breakpoint, amd64_linux_remove_hw_breakpoint): Ditto.
(amd64_linux_new_thread): Ditto.
(_initialize_amd64_linux_nat): Register linux new thread observer.
* testsuite/gdb.threads/watchthreads2.c: New test case.
* testsuite/gdb.threads/watchthreads2.exp: Ditto.
2007-10-14 Jan Kratochvil <jan.kratochvil@redhat.com>
Port to GDB-6.7.
Index: gdb-6.7/gdb/config/i386/nm-linux64.h
===================================================================
--- gdb-6.7.orig/gdb/config/i386/nm-linux64.h 2007-08-23 20:08:48.000000000 +0200
+++ gdb-6.7/gdb/config/i386/nm-linux64.h 2007-10-14 23:41:50.000000000 +0200
@@ -33,20 +33,58 @@
/* Provide access to the i386 hardware debugging registers. */
-extern void amd64_linux_dr_set_control (unsigned long control);
+extern void amd64_linux_dr_set_control (ptid_t ptid, unsigned long control);
#define I386_DR_LOW_SET_CONTROL(control) \
- amd64_linux_dr_set_control (control)
+ amd64_linux_dr_set_control (inferior_ptid, control)
-extern void amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr);
+extern void amd64_linux_dr_set_addr (ptid_t ptid, int regnum, CORE_ADDR addr);
#define I386_DR_LOW_SET_ADDR(regnum, addr) \
- amd64_linux_dr_set_addr (regnum, addr)
+ amd64_linux_dr_set_addr (inferior_ptid, regnum, addr)
-extern void amd64_linux_dr_reset_addr (int regnum);
+extern void amd64_linux_dr_reset_addr (ptid_t ptid, int regnum);
#define I386_DR_LOW_RESET_ADDR(regnum) \
- amd64_linux_dr_reset_addr (regnum)
+ amd64_linux_dr_reset_addr (inferior_ptid, regnum)
-extern unsigned long amd64_linux_dr_get_status (void);
+extern unsigned long amd64_linux_dr_get_status (ptid_t ptid);
#define I386_DR_LOW_GET_STATUS() \
- amd64_linux_dr_get_status ()
+ amd64_linux_dr_get_status (inferior_ptid)
+
+/* Watchpoints and hardware breakpoints. */
+
+/* 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 amd64_linux_insert_watchpoint (CORE_ADDR addr, int len, int type);
+
+/* 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 amd64_linux_remove_watchpoint (CORE_ADDR addr, int len, int type);
+
+/* Insert a hardware-assisted breakpoint at address ADDR. SHADOW is
+ * * unused. Return 0 on success, EBUSY on failure. */
+extern int amd64_linux_insert_hw_breakpoint (struct bp_target_info *bp_tgt);
+
+/* Remove a hardware-assisted breakpoint at address ADDR. SHADOW is
+ * * unused. Return 0 on success, -1 on failure. */
+extern int amd64_linux_remove_hw_breakpoint (struct bp_target_info *bp_tgt);
+
+/* Override basic amd64 macros for watchpoint and hardware breakpoint
+ * insertion/removal to support threads. */
+#undef target_insert_watchpoint
+#define target_insert_watchpoint(addr, len, type) \
+ amd64_linux_insert_watchpoint (addr, len, type)
+
+#undef target_remove_watchpoint
+#define target_remove_watchpoint(addr, len, type) \
+ amd64_linux_remove_watchpoint (addr, len, type)
+
+#undef target_insert_hw_breakpoint
+#define target_insert_hw_breakpoint(bp_tgt) \
+ amd64_linux_insert_hw_breakpoint (bp_tgt)
+
+#undef target_remove_hw_breakpoint
+#define target_remove_hw_breakpoint(bp_tgt) \
+ amd64_linux_remove_hw_breakpoint (bp_tgt)
#endif /* nm-linux64.h */
Index: gdb-6.7/gdb/config/i386/nm-linux.h
===================================================================
--- gdb-6.7.orig/gdb/config/i386/nm-linux.h 2007-08-23 20:08:48.000000000 +0200
+++ gdb-6.7/gdb/config/i386/nm-linux.h 2007-10-14 23:40:55.000000000 +0200
@@ -29,21 +29,60 @@
/* Provide access to the i386 hardware debugging registers. */
-extern void i386_linux_dr_set_control (unsigned long control);
+extern void i386_linux_dr_set_control (ptid_t ptid, unsigned long control);
#define I386_DR_LOW_SET_CONTROL(control) \
- i386_linux_dr_set_control (control)
+ i386_linux_dr_set_control (inferior_ptid, control)
-extern void i386_linux_dr_set_addr (int regnum, CORE_ADDR addr);
+extern void i386_linux_dr_set_addr (ptid_t ptid, int regnum, CORE_ADDR addr);
#define I386_DR_LOW_SET_ADDR(regnum, addr) \
- i386_linux_dr_set_addr (regnum, addr)
+ i386_linux_dr_set_addr (inferior_ptid, regnum, addr)
-extern void i386_linux_dr_reset_addr (int regnum);
+extern void i386_linux_dr_reset_addr (ptid_t ptid, int regnum);
#define I386_DR_LOW_RESET_ADDR(regnum) \
- i386_linux_dr_reset_addr (regnum)
+ i386_linux_dr_reset_addr (inferior_ptid, regnum)
-extern unsigned long i386_linux_dr_get_status (void);
+extern unsigned long i386_linux_dr_get_status (ptid_t ptid);
#define I386_DR_LOW_GET_STATUS() \
- i386_linux_dr_get_status ()
+ i386_linux_dr_get_status (inferior_ptid)
+
+/* Watchpoints and hardware breakpoints. */
+
+/* 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 i386_linux_insert_watchpoint (CORE_ADDR addr, int len, int type);
+
+/* 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 i386_linux_remove_watchpoint (CORE_ADDR addr, int len, int type);
+
+/* Insert a hardware-assisted breakpoint at address ADDR. SHADOW is
+ * unused. Return 0 on success, EBUSY on failure. */
+extern int i386_linux_insert_hw_breakpoint (struct bp_target_info *bp_tgt);
+
+/* Remove a hardware-assisted breakpoint at address ADDR. SHADOW is
+ * unused. Return 0 on success, -1 on failure. */
+extern int i386_linux_remove_hw_breakpoint (struct bp_target_info *bp_tgt);
+
+/* Override basic i386 macros for watchpoint and hardware breakpoint
+ insertion/removal to support threads. */
+#undef target_insert_watchpoint
+#define target_insert_watchpoint(addr, len, type) \
+ i386_linux_insert_watchpoint (addr, len, type)
+
+#undef target_remove_watchpoint
+#define target_remove_watchpoint(addr, len, type) \
+ i386_linux_remove_watchpoint (addr, len, type)
+
+#undef target_insert_hw_breakpoint
+#define target_insert_hw_breakpoint(bp_tgt) \
+ i386_linux_insert_hw_breakpoint (bp_tgt)
+
+#undef target_remove_hw_breakpoint
+#define target_remove_hw_breakpoint(bp_tgt) \
+ i386_linux_remove_hw_breakpoint (bp_tgt)
+
#ifdef HAVE_PTRACE_GETFPXREGS
Index: gdb-6.7/gdb/i386-nat.c
===================================================================
--- gdb-6.7.orig/gdb/i386-nat.c 2007-08-23 20:08:34.000000000 +0200
+++ gdb-6.7/gdb/i386-nat.c 2007-10-14 23:39:04.000000000 +0200
@@ -19,6 +19,7 @@
#include "defs.h"
#include "breakpoint.h"
+#include "inferior.h"
#include "command.h"
#include "gdbcmd.h"
Index: gdb-6.7/gdb/testsuite/gdb.threads/watchthreads2.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ gdb-6.7/gdb/testsuite/gdb.threads/watchthreads2.c 2007-10-14 23:39:04.000000000 +0200
@@ -0,0 +1,66 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+
+ 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.
+
+ This file is copied from schedlock.c. */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+void *thread_function(void *arg); /* Pointer to function executed by each thread */
+
+#define NUM 5
+
+unsigned int args[NUM+1];
+
+int main() {
+ int res;
+ pthread_t threads[NUM];
+ void *thread_result;
+ long i;
+
+ for (i = 0; i < NUM; i++)
+ {
+ args[i] = 1; /* Init value. */
+ res = pthread_create(&threads[i],
+ NULL,
+ thread_function,
+ (void *) i);
+ }
+
+ args[i] = 1;
+ thread_function ((void *) i);
+
+ exit(EXIT_SUCCESS);
+}
+
+void *thread_function(void *arg) {
+ int my_number = (long) arg;
+ int *myp = (int *) &args[my_number];
+
+ /* Don't run forever. Run just short of it :) */
+ while (*myp > 0)
+ {
+ (*myp) ++; usleep (1); /* Loop increment. */
+ }
+
+ pthread_exit(NULL);
+}
+
Index: gdb-6.7/gdb/testsuite/gdb.threads/watchthreads2.exp
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ gdb-6.7/gdb/testsuite/gdb.threads/watchthreads2.exp 2007-10-14 23:39:04.000000000 +0200
@@ -0,0 +1,133 @@
+# This testcase is part of GDB, the GNU debugger.
+
+# Copyright 2005 Free Software Foundation, Inc.
+
+# 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.
+
+# Check that GDB can support multiple watchpoints across threads.
+
+if $tracelevel {
+ strace $tracelevel
+}
+
+set prms_id 0
+set bug_id 0
+
+# This test verifies that a watchpoint is detected in the proper thread
+# so the test is only meaningful on a system with hardware watchpoints.
+if [target_info exists gdb,no_hardware_watchpoints] {
+ return 0;
+}
+
+set testfile "watchthreads2"
+set srcfile ${testfile}.c
+set binfile ${objdir}/${subdir}/${testfile}
+if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "incdir=${objdir}"]] != "" } {
+ return -1
+}
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_load ${binfile}
+
+gdb_test "set can-use-hw-watchpoints 1" "" ""
+
+#
+# Run to `main' where we begin our tests.
+#
+
+if ![runto_main] then {
+ gdb_suppress_tests
+}
+
+set args_2 0
+set args_3 0
+
+gdb_breakpoint "thread_function"
+gdb_continue_to_breakpoint "thread_function"
+gdb_test "disable 2" ""
+
+gdb_test_multiple "p args\[2\]" "get initial args2" {
+ -re "\\\$\[0-9\]* = (.*)$gdb_prompt $" {
+ set init_args_2 $expect_out(1,string)
+ pass "get initial args2"
+ }
+}
+
+gdb_test_multiple "p args\[3\]" "get initial args3" {
+ -re "\\\$\[0-9\]* = (.*)$gdb_prompt $" {
+ set init_args_3 $expect_out(1,string)
+ pass "get initial args3"
+ }
+}
+
+set args_2 $init_args_2
+set args_3 $init_args_3
+
+# Watch values that will be modified by distinct threads.
+gdb_test "watch args\[2\]" "Hardware watchpoint 3: args\\\[2\\\]"
+gdb_test "watch args\[3\]" "Hardware watchpoint 4: args\\\[3\\\]"
+
+set init_line [expr [gdb_get_line_number "Init value"]+1]
+set inc_line [gdb_get_line_number "Loop increment"]
+
+# Loop and continue to allow both watchpoints to be triggered.
+for {set i 0} {$i < 30} {incr i} {
+ set test_flag 0
+ gdb_test_multiple "continue" "threaded watch loop" {
+ -re "Hardware watchpoint 3: args\\\[2\\\].*Old value = 0.*New value = 1.*main \\\(\\\) at .*watchthreads2.c:$init_line.*$gdb_prompt $"
+ { set args_2 1; set test_flag 1 }
+ -re "Hardware watchpoint 4: args\\\[3\\\].*Old value = 0.*New value = 1.*main \\\(\\\) at .*watchthreads2.c:$init_line.*$gdb_prompt $"
+ { set args_3 1; set test_flag 1 }
+ -re "Hardware watchpoint 3: args\\\[2\\\].*Old value = $args_2.*New value = [expr $args_2+1].*in thread_function \\\(arg=0x2\\\) at .*watchthreads2.c:$inc_line.*$gdb_prompt $"
+ { set args_2 [expr $args_2+1]; set test_flag 1 }
+ -re "Hardware watchpoint 4: args\\\[3\\\].*Old value = $args_3.*New value = [expr $args_3+1].*in thread_function \\\(arg=0x3\\\) at .*watchthreads2.c:$inc_line.*$gdb_prompt $"
+ { set args_3 [expr $args_3+1]; set test_flag 1 }
+ }
+ # If we fail above, don't bother continuing loop
+ if { $test_flag == 0 } {
+ set i 30;
+ }
+}
+
+# Print success message if loop succeeded.
+if { $test_flag == 1 } {
+ pass "threaded watch loop"
+}
+
+# Verify that we hit first watchpoint in child thread.
+set message "watchpoint on args\[2\] hit in thread"
+if { $args_2 > 1 } {
+ pass $message
+} else {
+ fail $message
+}
+
+# Verify that we hit second watchpoint in child thread.
+set message "watchpoint on args\[3\] hit in thread"
+if { $args_3 > 1 } {
+ pass $message
+} else {
+ fail $message
+}
+
+# Verify that all watchpoint hits are accounted for.
+set message "combination of threaded watchpoints = 30 + initial values"
+if { [expr $args_2+$args_3] == [expr [expr 30+$init_args_2]+$init_args_3] } {
+ pass $message
+} else {
+ fail $message
+}
Index: gdb-6.7/gdb/i386-linux-nat.c
===================================================================
--- gdb-6.7.orig/gdb/i386-linux-nat.c 2007-10-13 05:09:50.000000000 +0200
+++ gdb-6.7/gdb/i386-linux-nat.c 2007-10-14 23:39:04.000000000 +0200
@@ -22,6 +22,7 @@
#include "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
+#include "observer.h"
#include "target.h"
#include "linux-nat.h"
@@ -580,14 +581,14 @@ i386_linux_store_inferior_registers (str
/* Support for debug registers. */
static unsigned long
-i386_linux_dr_get (int regnum)
+i386_linux_dr_get (ptid_t ptid, int regnum)
{
int tid;
unsigned long value;
- tid = TIDGET (inferior_ptid);
+ tid = TIDGET (ptid);
if (tid == 0)
- tid = PIDGET (inferior_ptid);
+ tid = PIDGET (ptid);
/* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
ptrace call fails breaks debugging remote targets. The correct
@@ -608,13 +609,13 @@ i386_linux_dr_get (int regnum)
}
static void
-i386_linux_dr_set (int regnum, unsigned long value)
+i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
{
int tid;
- tid = TIDGET (inferior_ptid);
+ tid = TIDGET (ptid);
if (tid == 0)
- tid = PIDGET (inferior_ptid);
+ tid = PIDGET (ptid);
errno = 0;
ptrace (PTRACE_POKEUSER, tid,
@@ -624,34 +625,158 @@ i386_linux_dr_set (int regnum, unsigned
}
void
-i386_linux_dr_set_control (unsigned long control)
+i386_linux_dr_set_control (ptid_t ptid, unsigned long control)
{
- i386_linux_dr_set (DR_CONTROL, control);
+ i386_linux_dr_set (ptid, DR_CONTROL, control);
}
void
-i386_linux_dr_set_addr (int regnum, CORE_ADDR addr)
+i386_linux_dr_set_addr (ptid_t ptid, int regnum, CORE_ADDR addr)
{
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
- i386_linux_dr_set (DR_FIRSTADDR + regnum, addr);
+ i386_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr);
}
void
-i386_linux_dr_reset_addr (int regnum)
+i386_linux_dr_reset_addr (ptid_t ptid, int regnum)
{
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
- i386_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
+ i386_linux_dr_set (ptid, DR_FIRSTADDR + regnum, 0L);
}
unsigned long
-i386_linux_dr_get_status (void)
+i386_linux_dr_get_status (ptid_t ptid)
{
- return i386_linux_dr_get (DR_STATUS);
+ return i386_linux_dr_get (ptid, DR_STATUS);
}
+/* Structure used to sync debug registers for all threads. */
+struct i386_debug_register_state
+{
+ int tid;
+ CORE_ADDR addr[DR_LASTADDR - DR_FIRSTADDR + 1];
+ unsigned long control;
+};
+
+static void
+i386_linux_set_debug_regs_for_thread (ptid_t ptid,
+ struct i386_debug_register_state *dbs)
+{
+ int i;
+ for (i = 0; i < (DR_LASTADDR - DR_FIRSTADDR) + 1; ++i)
+ i386_linux_dr_set_addr (ptid, i, dbs->addr[i]);
+ i386_linux_dr_set_control (ptid, dbs->control);
+}
+
+/* Iterator function to support syncing debug registers across all threads. */
+static int
+i386_linux_sync_debug_registers_callback (struct lwp_info *lwp, void *data)
+{
+ struct i386_debug_register_state *args = data;
+ int i, tid;
+
+ tid = TIDGET (lwp->ptid);
+ if (tid == 0)
+ tid = PIDGET (lwp->ptid);
+
+ if (tid != args->tid)
+ i386_linux_set_debug_regs_for_thread (lwp->ptid, args);
+ return 0;
+}
+
+/* Sync the debug registers for all known threads to the current
+ thread that has just performed an operation. This is required
+ because the debug registers are thread-specific. We want
+ watchpoints and hardware breakpoints to be treated globally
+ across all threads. */
+static int
+i386_linux_sync_debug_registers_across_threads (void)
+{
+ int i, tid;
+ struct i386_debug_register_state args;
+
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid);
+
+ args.tid = tid;
+ for (i = 0; i < (DR_LASTADDR - DR_FIRSTADDR) + 1; ++i)
+ args.addr[i] = i386_linux_dr_get (inferior_ptid, DR_FIRSTADDR + i);
+ args.control = i386_linux_dr_get (inferior_ptid, DR_CONTROL);
+
+ iterate_over_lwps (&i386_linux_sync_debug_registers_callback, &args);
+
+ return 0;
+}
+
+/* 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. */
+int
+i386_linux_insert_watchpoint (CORE_ADDR addr, int len, int type)
+{
+ int rc;
+ rc = i386_insert_watchpoint (addr, len, type);
+ if (!rc)
+ i386_linux_sync_debug_registers_across_threads ();
+ return rc;
+}
+
+/* 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. */
+int
+i386_linux_remove_watchpoint (CORE_ADDR addr, int len, int type)
+{
+ int rc;
+ rc = i386_remove_watchpoint (addr, len, type);
+ if (!rc)
+ i386_linux_sync_debug_registers_across_threads ();
+ return rc;
+}
+
+/* Insert a hardware-assisted breakpoint at address ADDR. SHADOW is
+ unused. Return 0 on success, EBUSY on failure. */
+int
+i386_linux_insert_hw_breakpoint (struct bp_target_info *bp_tgt)
+{
+ int rc;
+ rc = i386_insert_hw_breakpoint (bp_tgt);
+ if (!rc)
+ i386_linux_sync_debug_registers_across_threads ();
+ return rc;
+}
+
+/* Remove a hardware-assisted breakpoint at address ADDR. SHADOW is
+ unused. Return 0 on success, -1 on failure. */
+int
+i386_linux_remove_hw_breakpoint (struct bp_target_info *bp_tgt)
+{
+ int rc;
+ rc = i386_remove_hw_breakpoint (bp_tgt);
+ if (!rc)
+ i386_linux_sync_debug_registers_across_threads ();
+ return rc;
+}
+
+/* Observer function for a new thread attach. We need to insert
+ existing watchpoints and hardware breakpoints on the new thread. */
+static void
+i386_linux_new_thread (ptid_t ptid)
+{
+ int i;
+ struct i386_debug_register_state dbs;
+
+ for (i = 0; i < (DR_LASTADDR - DR_FIRSTADDR) + 1; ++i)
+ dbs.addr[i] = i386_linux_dr_get (inferior_ptid, DR_FIRSTADDR + i);
+ dbs.control = i386_linux_dr_get (inferior_ptid, DR_CONTROL);
+
+ i386_linux_set_debug_regs_for_thread (ptid, &dbs);
+}
+
/* Called by libthread_db. Returns a pointer to the thread local
storage (or its descriptor). */
@@ -816,4 +941,6 @@ _initialize_i386_linux_nat (void)
/* Register the target. */
linux_nat_add_target (t);
+
+ observer_attach_linux_new_thread (i386_linux_new_thread);
}
Index: gdb-6.7/gdb/amd64-linux-nat.c
===================================================================
--- gdb-6.7.orig/gdb/amd64-linux-nat.c 2007-10-13 05:09:50.000000000 +0200
+++ gdb-6.7/gdb/amd64-linux-nat.c 2007-10-14 23:39:04.000000000 +0200
@@ -23,6 +23,7 @@
#include "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
+#include "observer.h"
#include "linux-nat.h"
#include "amd64-linux-tdep.h"
@@ -235,14 +236,14 @@ amd64_linux_store_inferior_registers (st
static unsigned long
-amd64_linux_dr_get (int regnum)
+amd64_linux_dr_get (ptid_t ptid, int regnum)
{
int tid;
unsigned long value;
- tid = TIDGET (inferior_ptid);
+ tid = TIDGET (ptid);
if (tid == 0)
- tid = PIDGET (inferior_ptid);
+ tid = PIDGET (ptid);
/* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
ptrace call fails breaks debugging remote targets. The correct
@@ -263,13 +264,13 @@ amd64_linux_dr_get (int regnum)
}
static void
-amd64_linux_dr_set (int regnum, unsigned long value)
+amd64_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
{
int tid;
- tid = TIDGET (inferior_ptid);
+ tid = TIDGET (ptid);
if (tid == 0)
- tid = PIDGET (inferior_ptid);
+ tid = PIDGET (ptid);
errno = 0;
ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value);
@@ -278,34 +279,158 @@ amd64_linux_dr_set (int regnum, unsigned
}
void
-amd64_linux_dr_set_control (unsigned long control)
+amd64_linux_dr_set_control (ptid_t ptid, unsigned long control)
{
- amd64_linux_dr_set (DR_CONTROL, control);
+ amd64_linux_dr_set (ptid, DR_CONTROL, control);
}
void
-amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
+amd64_linux_dr_set_addr (ptid_t ptid, int regnum, CORE_ADDR addr)
{
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
- amd64_linux_dr_set (DR_FIRSTADDR + regnum, addr);
+ amd64_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr);
}
void
-amd64_linux_dr_reset_addr (int regnum)
+amd64_linux_dr_reset_addr (ptid_t ptid, int regnum)
{
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
- amd64_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
+ amd64_linux_dr_set (ptid, DR_FIRSTADDR + regnum, 0L);
}
unsigned long
-amd64_linux_dr_get_status (void)
+amd64_linux_dr_get_status (ptid_t ptid)
{
- return amd64_linux_dr_get (DR_STATUS);
+ return amd64_linux_dr_get (ptid, DR_STATUS);
}
+/* Structure used to sync debug registers for all threads. */
+struct amd64_debug_register_state
+{
+ int tid;
+ CORE_ADDR addr[DR_LASTADDR - DR_FIRSTADDR + 1];
+ unsigned long control;
+};
+
+static void
+amd64_linux_set_debug_regs_for_thread (ptid_t ptid,
+ struct amd64_debug_register_state *dbs)
+{
+ int i;
+ for (i = 0; i < (DR_LASTADDR - DR_FIRSTADDR) + 1; ++i)
+ amd64_linux_dr_set_addr (ptid, i, dbs->addr[i]);
+ amd64_linux_dr_set_control (ptid, dbs->control);
+}
+
+/* Iterator function to support syncing debug registers across all threads. */
+static int
+amd64_linux_sync_debug_registers_callback (struct lwp_info *lwp, void *data)
+{
+ struct amd64_debug_register_state *args = data;
+ int i, tid;
+
+ tid = TIDGET (lwp->ptid);
+ if (tid == 0)
+ tid = PIDGET (lwp->ptid);
+
+ if (tid != args->tid)
+ amd64_linux_set_debug_regs_for_thread (lwp->ptid, args);
+ return 0;
+}
+
+/* Sync the debug registers for all known threads to the current
+ thread that has just performed an operation. This is required
+ because the debug registers are thread-specific. We want
+ watchpoints and hardware breakpoints to be treated globally
+ across all threads. */
+static int
+amd64_linux_sync_debug_registers_across_threads (void)
+{
+ int i, tid;
+ struct amd64_debug_register_state args;
+
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid);
+
+ args.tid = tid;
+ for (i = 0; i < (DR_LASTADDR - DR_FIRSTADDR) + 1; ++i)
+ args.addr[i] = amd64_linux_dr_get (inferior_ptid, DR_FIRSTADDR + i);
+ args.control = amd64_linux_dr_get (inferior_ptid, DR_CONTROL);
+
+ iterate_over_lwps (&amd64_linux_sync_debug_registers_callback, &args);
+
+ return 0;
+}
+
+/* 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. */
+int
+amd64_linux_insert_watchpoint (CORE_ADDR addr, int len, int type)
+{
+ int rc;
+ rc = i386_insert_watchpoint (addr, len, type);
+ if (!rc)
+ amd64_linux_sync_debug_registers_across_threads ();
+ return rc;
+}
+
+/* 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. */
+int
+amd64_linux_remove_watchpoint (CORE_ADDR addr, int len, int type)
+{
+ int rc;
+ rc = i386_remove_watchpoint (addr, len, type);
+ if (!rc)
+ amd64_linux_sync_debug_registers_across_threads ();
+ return rc;
+}
+
+/* Insert a hardware-assisted breakpoint at address ADDR. SHADOW is
+ unused. Return 0 on success, EBUSY on failure. */
+int
+amd64_linux_insert_hw_breakpoint (struct bp_target_info *bp_tgt)
+{
+ int rc;
+ rc = i386_insert_hw_breakpoint (bp_tgt);
+ if (!rc)
+ amd64_linux_sync_debug_registers_across_threads ();
+ return rc;
+}
+
+/* Remove a hardware-assisted breakpoint at address ADDR. SHADOW is
+ unused. Return 0 on success, -1 on failure. */
+int
+amd64_linux_remove_hw_breakpoint (struct bp_target_info *bp_tgt)
+{
+ int rc;
+ rc = i386_remove_hw_breakpoint (bp_tgt);
+ if (!rc)
+ amd64_linux_sync_debug_registers_across_threads ();
+ return rc;
+}
+
+/* Observer function for a new thread attach. We need to insert
+ existing watchpoints and hardware breakpoints on the new thread. */
+static void
+amd64_linux_new_thread (ptid_t ptid)
+{
+ int i;
+ struct amd64_debug_register_state dbs;
+
+ for (i = 0; i < (DR_LASTADDR - DR_FIRSTADDR) + 1; ++i)
+ dbs.addr[i] = amd64_linux_dr_get (inferior_ptid, DR_FIRSTADDR + i);
+ dbs.control = amd64_linux_dr_get (inferior_ptid, DR_CONTROL);
+
+ amd64_linux_set_debug_regs_for_thread (ptid, &dbs);
+}
+
/* This function is called by libthread_db as part of its handling of
a request for a thread's local storage address. */
@@ -406,4 +531,6 @@ _initialize_amd64_linux_nat (void)
/* Register the target. */
linux_nat_add_target (t);
+
+ observer_attach_linux_new_thread (amd64_linux_new_thread);
}
Index: gdb-6.7/gdb/testsuite/gdb.threads/watchthreads.c
===================================================================
--- gdb-6.7.orig/gdb/testsuite/gdb.threads/watchthreads.c 2007-08-23 20:08:50.000000000 +0200
+++ gdb-6.7/gdb/testsuite/gdb.threads/watchthreads.c 2007-10-14 23:39:04.000000000 +0200
@@ -56,7 +56,7 @@ void *thread_function(void *arg) {
/* Don't run forever. Run just short of it :) */
while (*myp > 0)
{
- (*myp) ++; /* Loop increment. */
+ (*myp) ++; usleep (1); /* Loop increment. */
}
pthread_exit(NULL);
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