From FEDORA_PATCHES Mon Sep 17 00:00:00 2001

From: Jeff Johnston <jjohnstn@redhat.com>

Date: Fri, 27 Oct 2017 21:07:50 +0200

Subject: gdb-6.3-threaded-watchpoints2-20050225.patch

;; Test sibling threads to set threaded watchpoints for x86 and x86-64

;;=fedoratest

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/watchthreads-threaded.c: New test case.

	* testsuite/gdb.threads/watchthreads-threaded.exp: Ditto.

[ With recent upstream GDB (6.8) reduced only to the testcase.  ]

[ It was called watchthreads2.{exp,c} before but it conflicted with FSF GDB new

  testcase of the same name.  ]

FIXME: The testcase does not expects multiple watchpoints hits per one stop.

diff --git a/gdb/testsuite/gdb.threads/watchthreads-threaded.c b/gdb/testsuite/gdb.threads/watchthreads-threaded.c

new file mode 100644

--- /dev/null

+++ b/gdb/testsuite/gdb.threads/watchthreads-threaded.c

@@ -0,0 +1,65 @@

+/* 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);

+}

diff --git a/gdb/testsuite/gdb.threads/watchthreads-threaded.exp b/gdb/testsuite/gdb.threads/watchthreads-threaded.exp

new file mode 100644

--- /dev/null

+++ b/gdb/testsuite/gdb.threads/watchthreads-threaded.exp

@@ -0,0 +1,126 @@

+# 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.

+

+# 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 "watchthreads-threaded"

+set srcfile ${testfile}.c

+set binfile [standard_output_file ${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 .*watchthreads-threaded.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 .*watchthreads-threaded.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].*thread_function \\\(arg=0x2\\\) at .*watchthreads-threaded.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].*thread_function \\\(arg=0x3\\\) at .*watchthreads-threaded.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

+}