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# Copyright (C) 2014-2022 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 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/>.
# Test that when a step-over trips on a watchpoint, that watchpoint is
# reported.
standard_testfile
set executable ${testfile}
# This test verifies that a watchpoint is detected in a multithreaded
# program so the test is only meaningful on a system with hardware
# watchpoints.
if {[skip_hw_watchpoint_tests]} {
return 0
}
if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
executable [list debug "incdir=${objdir}"]] != "" } {
return -1
}
# The test proper. DISPLACED is true if we should try with displaced
# stepping. WITH_BP is true if we should try with a thread-specific
# breakpoint (for the wrong thread) right after the instruction that
# triggers the watchpoint.
proc do_test { displaced with_bp } {
global executable
global gdb_prompt
global hex
if ${with_bp} {
set prefix "with thread-specific bp"
} else {
set prefix "no thread-specific bp"
}
with_test_prefix "displaced=$displaced: $prefix" {
# Cover both stepping and non-stepping execution commands.
foreach command {"step" "next" "continue" } {
with_test_prefix $command {
clean_restart $executable
if ![runto_main] {
continue
}
gdb_test_no_output "set displaced-stepping $displaced"
set line [gdb_get_line_number "set wait-thread breakpoint here"]
if { ![gdb_breakpoint $line] } {
return
}
gdb_continue_to_breakpoint "run to wait-thread breakpoint"
gdb_test "info threads" "\\\* 1 .* 2 .*" "info threads shows all threads"
gdb_test_no_output "set scheduler-locking on"
delete_breakpoints
gdb_breakpoint [gdb_get_line_number "set breakpoint child here"]
gdb_test "thread 2" "Switching to .*"
gdb_continue_to_breakpoint "run to breakpoint in thread 2"
set address_triggers_watch "<invalid>"
set after_address_triggers_watch "<invalid>"
# Let the watchpoint trigger once (with the other
# thread locked), in order to find both the address of
# the instruction that triggers the watchpoint and the
# address of the instruction immediately after.
with_test_prefix "find addresses" {
gdb_test "p watch_me = 0" " = 0" "clear watch_me"
gdb_test "watch watch_me" "Hardware watchpoint .*"
gdb_test "continue" \
"Hardware watchpoint.*: watch_me.*New value = 1.*" \
"continue to watchpoint"
set msg "find addresses"
gdb_test_multiple "disassemble" $msg {
-re " ($hex) \[^\r\n\]*\r\n=> ($hex) .*$gdb_prompt $" {
set address_triggers_watch $expect_out(1,string)
set after_address_triggers_watch $expect_out(2,string)
pass $msg
}
}
delete_breakpoints
}
gdb_test "break *$address_triggers_watch" "Breakpoint .*" \
"set breakpoint at address that triggers watch"
gdb_continue_to_breakpoint \
"run to instruction that triggers watch in thread 2"
gdb_test "p counter = 0" " = 0" "unbreak loop in thread 2"
gdb_test "p watch_me = 0" " = 0" "clear watch_me"
gdb_test "watch watch_me" "Hardware watchpoint .*"
if ${with_bp} {
gdb_test "b *$after_address_triggers_watch thread 1" \
"Breakpoint .*" \
"set breakpoint specific to thread 1"
}
# Switch back to thread 1 and disable scheduler locking.
gdb_test "thread 1" "Switching to .*"
gdb_test_no_output "set scheduler-locking off"
# Thread 2 is still stopped at a breakpoint that needs
# to be stepped over. However, the instruction that
# is under the breakpoint triggers a watchpoint, which
# should trap and be reported to the user.
gdb_test "$command" "Hardware watchpoint.*: watch_me.*New value = 1.*"
}
}
}
}
foreach displaced { "off" "on" } {
if { $displaced != "off" && ![support_displaced_stepping] } {
continue
}
foreach with_bp { 0 1 } {
do_test $displaced $with_bp
}
}
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