mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-21 04:42:53 +08:00
42a4f53d2b
This commit applies all changes made after running the gdb/copyright.py script. Note that one file was flagged by the script, due to an invalid copyright header (gdb/unittests/basic_string_view/element_access/char/empty.cc). As the file was copied from GCC's libstdc++-v3 testsuite, this commit leaves this file untouched for the time being; a patch to fix the header was sent to gcc-patches first. gdb/ChangeLog: Update copyright year range in all GDB files.
177 lines
5.3 KiB
Plaintext
177 lines
5.3 KiB
Plaintext
# This testcase is part of GDB, the GNU debugger.
|
|
|
|
# Copyright 2014-2019 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/>.
|
|
|
|
# This file is part of the gdb testsuite.
|
|
|
|
# Test that GDB presents a hardware watchpoint stop at the first
|
|
# instruction right after the instruction that changes memory.
|
|
#
|
|
# Some targets trigger a hardware watchpoint after the instruction
|
|
# that wrote memory executes, thus with the memory already changed and
|
|
# the PC pointing to the instruction after the instruction that wrote
|
|
# to memory. These targets are said to have "continuable"
|
|
# watchpoints, referring to the fact that to make progress after the
|
|
# watchpoint triggers, GDB just needs to continue the target.
|
|
#
|
|
# Other targets trigger a hardware watchpoint at the instruction which
|
|
# has attempted to write to the piece of memory under control of the
|
|
# watchpoint, with the instruction actually not executed yet. To be
|
|
# able to check whether the watched value changed, GDB needs to
|
|
# complete the memory write, single-stepping the target once. These
|
|
# targets are said to have "non-continuable" watchpoints.
|
|
#
|
|
# This test makes sure that GDB knows which kind of watchpoint the
|
|
# target has, using this sequence of steps:
|
|
#
|
|
# 1 - run to main
|
|
#
|
|
# 2 - set a software watchpoint
|
|
#
|
|
# 3 - continue until watchpoint triggers
|
|
#
|
|
# 4 - the PC now points to the instruction right after the instruction
|
|
# that actually caused the memory write. So this is the address a
|
|
# hardware watchpoint should present the stop to the user too.
|
|
# Store the PC address.
|
|
#
|
|
# 5 - replace the software watchpoint by a hardware watchpoint
|
|
#
|
|
# 6 - continue until hardware watchpoint triggers
|
|
#
|
|
# 7 - the PC must point to the same address the software watchpoint
|
|
# triggered at.
|
|
#
|
|
# If the target has continuable watchpoints, but GDB thinks it has
|
|
# non-continuable watchpoints, GDB will stop the inferior two
|
|
# instructions after the watched value change, rather than at the next
|
|
# instruction.
|
|
#
|
|
# If the target has non-continuable watchpoints, while GDB thinks it
|
|
# has continuable watchpoints, GDB will see a watchpoint trigger,
|
|
# notice no value changed, and immediatly continue the target. Now,
|
|
# either the target manages to step-over the watchpoint transparently,
|
|
# and GDB thus fails to present to value change to the user, or, the
|
|
# watchpoint will keep re-triggering, with the program never making
|
|
# any progress.
|
|
|
|
standard_testfile
|
|
|
|
# No use testing this if we can't use hardware watchpoints.
|
|
if {[target_info exists gdb,no_hardware_watchpoints]} {
|
|
return -1
|
|
}
|
|
|
|
if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
|
|
return -1
|
|
}
|
|
|
|
if { ![runto main] } then {
|
|
fail "run to main"
|
|
return
|
|
}
|
|
|
|
# Get the current PC. TEST is used as test prefix.
|
|
|
|
proc get_pc {test} {
|
|
global hex gdb_prompt
|
|
|
|
set addr ""
|
|
gdb_test_multiple "p /x \$pc" "$test" {
|
|
-re " = ($hex).*$gdb_prompt $" {
|
|
set addr $expect_out(1,string)
|
|
pass "$test"
|
|
}
|
|
}
|
|
|
|
return $addr
|
|
}
|
|
|
|
# So we get an immediate warning/error if the target doesn't support a
|
|
# given watchpoint type.
|
|
gdb_test_no_output "set breakpoint always-inserted on"
|
|
|
|
set hw_watchpoints_supported 0
|
|
|
|
set test "set probe hw watchpoint"
|
|
gdb_test_multiple "watch global" $test {
|
|
-re "You may have requested too many.*$gdb_prompt $" {
|
|
pass $test
|
|
}
|
|
-re "Target does not support.*$gdb_prompt $" {
|
|
pass $test
|
|
}
|
|
-re "$gdb_prompt $" {
|
|
pass $test
|
|
set hw_watchpoints_supported 1
|
|
}
|
|
}
|
|
|
|
if {!$hw_watchpoints_supported} {
|
|
unsupported "no hw watchpoints support"
|
|
return
|
|
}
|
|
|
|
delete_breakpoints
|
|
|
|
proc test {always_inserted} {
|
|
global srcfile binfile
|
|
|
|
with_test_prefix "always-inserted $always_inserted" {
|
|
|
|
clean_restart $binfile
|
|
|
|
if { ![runto main] } then {
|
|
fail "run to main"
|
|
return
|
|
}
|
|
|
|
# Force use of software watchpoints.
|
|
gdb_test_no_output "set can-use-hw-watchpoints 0"
|
|
|
|
gdb_test "watch global" \
|
|
"Watchpoint .*: global" \
|
|
"set software watchpoint on global variable"
|
|
|
|
gdb_test "continue" \
|
|
"Watchpoint .*: global.*Old value = 0.*New value = 1.*set_global \\(val=1\\).*$srcfile.*" \
|
|
"software watchpoint triggers"
|
|
|
|
set sw_watch_pc [get_pc "get sw watchpoint PC"]
|
|
|
|
delete_breakpoints
|
|
|
|
# Allow hardware watchpoints again.
|
|
gdb_test_no_output "set can-use-hw-watchpoints 1"
|
|
|
|
gdb_test "watch global" \
|
|
"Hardware watchpoint .*: global" \
|
|
"set hardware watchpoint on global variable"
|
|
|
|
gdb_test "continue" \
|
|
"Hardware watchpoint .*: global.*Old value = 1.*New value = 2.*set_global \\(val=2\\).*$srcfile.*" \
|
|
"hardware watchpoint triggers"
|
|
|
|
set hw_watch_pc [get_pc "get hw watchpoint PC"]
|
|
|
|
gdb_assert {$sw_watch_pc == $hw_watch_pc} "hw watchpoint stops at right instruction"
|
|
}
|
|
}
|
|
|
|
foreach always_inserted {"off" "on" } {
|
|
test $always_inserted
|
|
}
|