blob: 24bc8276951c0dd9298bab189d19624310614b8e [file] [log] [blame]
# Copyright 1992-2023 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 was written by Fred Fish. (fnf@cygnus.com)
# The allow_hw_watchpoint_tests checks if watchpoints are supported by the
# processor. On PowerPC, the check runs a small test program under gdb
# to determine if the Power processor supports HW watchpoints. The check
# must be done before starting the test so as to not disrupt the execution
# of the actual test.
set allow_hw_watchpoint_tests_p [allow_hw_watchpoint_tests]
standard_testfile
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
untested "failed to compile"
return -1
}
# True if we're forcing no hardware watchpoints.
set no_hw 0
# Prepare for watchpoint tests by setting up two breakpoints and one
# watchpoint.
#
# We use breakpoints at marker functions to get past all the startup code,
# so we can get to the watchpoints in a reasonable amount of time from a
# known starting point.
#
# For simplicity, so we always know how to reference specific breakpoints or
# watchpoints by number, we expect a particular ordering and numbering of
# each in the combined breakpoint/watchpoint table, as follows:
#
# Number What Where
# 1 Breakpoint marker1()
# 2 Breakpoint marker2()
# 3 Watchpoint ival3
proc initialize {} {
global gdb_prompt
global hex
global decimal
global srcfile
if [gdb_test "break marker1" "Breakpoint 1 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker1" ] {
return 0
}
if [gdb_test "break marker2" "Breakpoint 2 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker2" ] {
return 0
}
if [gdb_test "info break" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*" "info break" ] {
return 0
}
gdb_test "watch ival3" ".*\[Ww\]atchpoint 3: ival3.*" "set watchpoint on ival3"
if [gdb_test "info watch" "3\[ \]*.*watchpoint.*ival3" "watchpoint found in watchpoint/breakpoint table" ] {
return 0
}
# After installing the watchpoint, we disable it until we are ready
# to use it. This allows the test program to run at full speed until
# we get to the first marker function.
if [gdb_test_no_output "disable 3" "disable watchpoint" ] {
return 0
}
return 1
}
#
# Test simple watchpoint.
#
proc test_simple_watchpoint {} {
global gdb_prompt
global hex
global decimal
# Ensure that the watchpoint is disabled when we startup.
if [gdb_test_no_output "disable 3" \
"disable watchpoint in test_simple_watchpoint" ] {
return 0
}
# Run until we get to the first marker function.
gdb_run_cmd
set timeout 600
set test "run to marker1 in test_simple_watchpoint"
set retcode [gdb_test_multiple "" $test {
-re "Breakpoint 1, marker1 .*$gdb_prompt $" {
pass $test
}
}]
if { $retcode != 0 } {
return
}
# After reaching the marker function, enable the watchpoint.
if [gdb_test_no_output "enable 3" "enable watchpoint" ] {
return
}
gdb_test "break func1" "Breakpoint.*at.*"
gdb_test_no_output "set \$func1_breakpoint_number = \$bpnum"
gdb_test "continue" "Continuing.*Breakpoint \[0-9\]*, func1.*" \
"continue to breakpoint at func1"
# Continue until the first change, from -1 to 0
set test "watchpoint hit, first time"
gdb_test_multiple "cont" $test {
-re "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*$gdb_prompt $" {
pass $test
}
-re "Continuing.*Breakpoint.*func1.*$gdb_prompt $" {
setup_xfail "m68*-*-*" 2597
fail "thought it hit breakpoint at func1 twice"
gdb_test_no_output "delete \$func1_breakpoint_number"
gdb_test "continue" "\
Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count;" \
$test
}
}
# Check that the hit count is reported correctly
gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 1 time.*" "watchpoint hit count is 1"
gdb_test_no_output "delete \$func1_breakpoint_number"
# Continue until the next change, from 0 to 1.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit, second time"
# Check that the hit count is reported correctly
gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 2 times.*" "watchpoint hit count is 2"
# Continue until the next change, from 1 to 2.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*" "watchpoint hit, third time"
# Check that the hit count is reported correctly
gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 3 times.*" "watchpoint hit count is 3"
# Continue until the next change, from 2 to 3.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*" "watchpoint hit, fourth time"
# Check that the hit count is reported correctly
gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 4 times.*" "watchpoint hit count is 4"
# Continue until the next change, from 3 to 4.
# Note that this one is outside the loop.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*" "watchpoint hit, fifth time"
# Check that the hit count is reported correctly
gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 5 times.*" "watchpoint hit count is 5"
# Continue until we hit the finishing marker function.
# Make sure we hit no more watchpoints.
gdb_test "cont" "Continuing.*Breakpoint.*marker2 \(\).*" \
"continue to marker2"
# Disable the watchpoint so we run at full speed until we exit.
if [gdb_test_no_output "disable 3" "watchpoint disabled" ] {
return
}
# Run until process exits.
if [target_info exists gdb,noresults] { return }
gdb_continue_to_end "continue to exit in test_simple_watchpoint"
}
# Test disabling watchpoints.
proc test_disabling_watchpoints {} {
global gdb_prompt
global binfile
global srcfile
global decimal
global hex
gdb_test "info watch" "\[0-9]+\[ \]*.*watchpoint.*ival3.*" "watchpoints found in watchpoint/breakpoint table"
# Ensure that the watchpoint is disabled when we startup.
if [gdb_test_no_output "disable 3" \
"disable watchpoint in test_disabling_watchpoints" ] {
return 0
}
# Run until we get to the first marker function.
gdb_run_cmd
set timeout 600
set test "run to marker1 in test_disabling_watchpoints"
set retcode [gdb_test_multiple "" $test {
-re "Breakpoint 1, marker1 .*$gdb_prompt $" {
pass $test
}
}]
if { $retcode != 0 } {
return
}
# After reaching the marker function, enable the watchpoint.
if [gdb_test_no_output "enable 3" "watchpoint enabled" ] {
return
}
# Continue until the first change, from -1 to 0
# Don't check the old value, because on VxWorks the variable value
# will not have been reinitialized.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, first time"
# Continue until the next change, from 0 to 1.
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, second time"
# Disable the watchpoint but leave breakpoints
if [gdb_test_no_output "disable 3" \
"disable watchpoint #2 in test_disabling_watchpoints" ] {
return 0
}
# Check watchpoint list, looking for the entry that confirms the
# watchpoint is disabled.
gdb_test "info watchpoints" "\[0-9]+\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*" "watchpoint disabled in table"
# Continue until we hit the finishing marker function.
# Make sure we hit no more watchpoints.
gdb_test "cont" "Continuing.*Breakpoint.*marker2 \\(\\).*" \
"disabled watchpoint skipped"
if [target_info exists gdb,noresults] { return }
gdb_continue_to_end "continue to exit in test_disabling_watchpoints"
}
# Test stepping and other mundane operations with watchpoints enabled
proc test_stepping {} {
global gdb_prompt
if {[runto marker1]} {
gdb_test "watch ival2" \
"^(?:Hardware w|W)atchpoint $::decimal: ival2"
# Well, let's not be too mundane. It should be a *bit* of a challenge
gdb_test "break func2 if 0" "Breakpoint.*at.*"
gdb_test "p \$func2_breakpoint_number = \$bpnum" " = .*"
gdb_test "p func1 ()" "= 73" \
"calling function with watchpoint enabled"
#
# "finish" brings us back to main.
# On some targets (e.g. alpha) gdb will stop from the finish in midline
# of the marker1 call. This is due to register restoring code on
# the alpha and might be caused by stack adjustment instructions
# on other targets. In this case we will step once more.
#
send_gdb "finish\n"
gdb_expect {
-re "Run.*exit from.*marker1.* at" {
pass "finish from marker1"
}
default { fail "finish from marker1 (timeout)" ; return }
}
gdb_expect {
-re "marker1 \\(\\);.*$gdb_prompt $" {
send_gdb "step\n"
exp_continue
}
-re "func1 \\(\\);.*$gdb_prompt $" {
pass "back at main from marker1"
}
-re ".*$gdb_prompt $" {
fail "back at main from marker1"
}
default { fail "back at main from marker1 (timeout)" ; return }
}
gdb_test "next" "for \\(count = 0.*" "next to `for'"
# Now test that "until" works. It's a bit tricky to test
# "until", because compilers don't always arrange the code
# exactly the same way, and we might get slightly different
# sequences of statements. But the following should be true
# (if not it is a compiler or a debugger bug): The user who
# does "until" at every statement of a loop should end up
# stepping through the loop once, and the debugger should not
# stop for any of the remaining iterations.
gdb_test "until" "ival1 = count.*" "until to ival1 assignment"
gdb_test "until" "ival3 = count.*" "until to ival3 assignment"
set test "until out of loop"
gdb_test_multiple "until" $test {
-re "(for \\(count = 0|\}).*$gdb_prompt $" {
gdb_test "until" "ival1 = count; /. Outside loop ./" $test
}
-re "ival1 = count; /. Outside loop ./.*$gdb_prompt $" {
pass $test
}
}
gdb_test "step" "ival2 = count.*" "step to ival2 assignment"
# Check that the watchpoint is triggered during a step.
gdb_test "step" \
"\[Ww\]atchpoint.*: ival2.*Old value = -1.*New value = 4.*ival3 = count; ival4 = count;" \
"step over ival2 assignment"
# Step again and check that correct statement is reached after
# hitting a watchpoint during a step.
gdb_test "step" "marker2 \\(\\);.*" "step to marker2"
}
}
# Test stepping and other mundane operations with watchpoints enabled
proc test_watchpoint_triggered_in_syscall {} {
global gdb_prompt
# These tests won't work without printf support.
if [gdb_skip_stdio_test "watchpoints triggered in syscall"] {
return
}
# Run until we get to the first marker function.
set x 0
set y 0
set testname "watch buffer passed to read syscall"
if {[runto marker2]} {
gdb_test "watch buf\[0\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[0\\\]"
gdb_test "watch buf\[1\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[1\\\]"
gdb_test "watch buf\[2\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[2\\\]"
gdb_test "watch buf\[3\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[3\\\]"
gdb_test "watch buf\[4\]" ".*\[Ww\]atchpoint \[0-9\]*: buf\\\[4\\\]"
gdb_test "break marker4" ".*Breakpoint.*"
gdb_test_no_output "set doread = 1"
# If we send gdb "123\n" before gdb has switched the tty, then it goes
# to gdb, not the inferior, and we lose. So that is why we have
# watchpoint.c prompt us, so we can wait for that prompt.
send_gdb "continue\n"
gdb_expect {
-re "Continuing\\.\r\ntype stuff for buf now:" {
pass "continue to read"
}
default {
fail "continue to read"
return
}
}
set test "sent 123"
gdb_test_multiple "123" $test {
-re ".*\[Ww\]atchpoint.*buf\\\[0\\\].*Old value = 0.*New value = 49\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*\[Ww\]atchpoint.*buf\\\[1\\\].*Old value = 0.*New value = 50\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*\[Ww\]atchpoint.*buf\\\[2\\\].*Old value = 0.*New value = 51\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*\[Ww\]atchpoint.*buf\\\[3\\\].*Old value = 0.*New value = 10\[^\n\]*\n" { set x [expr $x+1] ; exp_continue }
-re ".*$gdb_prompt $" { pass $test }
}
# Examine the values in buf to see how many watchpoints we
# should have printed.
set test "print buf\[0\]"
gdb_test_multiple $test $test {
-re ".*= 49.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
-re ".*= 0.*$gdb_prompt $" { $test }
}
set test "print buf\[1\]"
gdb_test_multiple $test $test {
-re ".*= 50.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
-re ".*= 0.*$gdb_prompt $" { pass $test }
}
set test "print buf\[2\]"
gdb_test_multiple $test $test {
-re ".*= 51.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
-re ".*= 0.*$gdb_prompt $" { pass $test }
}
set test "print buf\[3\]"
gdb_test_multiple $test $test {
-re ".*= 10.*$gdb_prompt $" { set y [expr $y+1]; pass $test }
-re ".*= 0.*$gdb_prompt $" { pass $test }
}
# Did we find what we were looking for? If not, flunk it.
if {[expr $x==$y]} { pass $testname } else { fail "$testname (only triggered $x watchpoints, expected $y)"}
# Continue until we hit the finishing marker function.
# Make sure we hit no more watchpoints.
gdb_test "cont" "Continuing.*Breakpoint.*marker4 \\(\\).*" \
"continue to marker4"
# Disable everything so we can finish the program at full speed
gdb_test_no_output "disable" "disable in test_watchpoint_triggered_in_syscall"
if [target_info exists gdb,noresults] { return }
gdb_continue_to_end "continue to exit in test_watchpoint_triggered_in_syscall"
}
}
# Do a simple test of of watching through a pointer when the pointer
# itself changes. Should add some more complicated stuff here.
proc test_complex_watchpoint {} {
global gdb_prompt
if {[runto marker4]} {
gdb_test "watch ptr1->val" \
"^(?:Hardware w|W)atchpoint $::decimal: ptr1->val"
gdb_test "break marker5" ".*Breakpoint.*"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ptr1->val.*Old value = 1.*New value = 2.*" "test complex watchpoint"
# Continue until we hit the marker5 function.
# Make sure we hit no more watchpoints.
gdb_test "cont" "Continuing.*Breakpoint.*marker5 \\(\\).*" \
"did not trigger wrong watchpoint"
# Test watches of things declared locally in a function.
# In particular, test that a watch of stack-based things
# is deleted when the stack-based things go out of scope.
#
gdb_test_no_output "disable" "disable in test_complex_watchpoint, first time"
gdb_test "break marker6" ".*Breakpoint.*"
gdb_test "cont" "Continuing.*Breakpoint.*marker6 \\(\\).*" \
"continue to marker6"
gdb_breakpoint [gdb_get_line_number "func2 breakpoint here"]
gdb_continue_to_breakpoint "func2 breakpoint here, first time"
# Test a watch of a single stack-based variable, whose scope
# is the function we're now in. This should auto-delete when
# execution exits the scope of the watchpoint.
#
gdb_test "watch local_a" \
"^(?:Hardware w|W)atchpoint $::decimal: local_a" \
"set local watch"
gdb_test "cont" "\[Ww\]atchpoint.*local_a.*" "trigger local watch"
set test "self-delete local watch"
gdb_test_multiple "cont" $test {
-re "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*\r\n$gdb_prompt $" {
pass $test
}
-re "can't compute CFA for this frame.*\r\n$gdb_prompt $" {
global no_hw
# GCC < 4.5.0 does not get LOCATIONS_VALID set by dwarf2read.c.
# Therefore epilogue unwinder gets applied which is
# incompatible with dwarf2_frame_cfa.
if {$no_hw && ([test_compiler_info {gcc-[0-3]-*}]
|| [test_compiler_info {gcc-4-[0-4]-*}])} {
xfail "$test (old GCC has broken watchpoints in epilogues)"
return
}
fail $test
}
}
gdb_continue_to_breakpoint "func2 breakpoint here, second time"
# We should be in "func2" again now. Test a watch of an
# expression which includes both a stack-based local and
# something whose scope is larger than this invocation
# of "func2". This should also auto-delete.
#
gdb_test "watch local_a + ival5" \
"^(?:Hardware w|W)atchpoint $::decimal: local_a . ival5" \
"set partially local watch"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
"trigger1 partially local watch"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_a . ival5.*" \
"trigger2 partially local watch"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
"self-delete partially local watch"
# We should be in "func2" again now. Test a watch of a
# static (non-stack-based) local. Since this has scope
# across any invocations of "func2", it should not auto-
# delete.
#
gdb_continue_to_breakpoint "func2 breakpoint here, third time"
gdb_test "watch static_b" \
"^(?:Hardware w|W)atchpoint $::decimal: static_b" \
"set static local watch"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: static_b.*" \
"trigger static local watch"
gdb_test "cont" "Continuing.*marker6 \\(\\).*" \
"continue after trigger static local watch"
gdb_test "info break" ".*watchpoint.*static_b.*" \
"static local watch did not self-delete"
# We should be in "recurser" now. Test a watch of a stack-
# based local. Symbols mentioned in a watchpoint are bound
# at watchpoint-creation. Thus, a watch of a stack-based
# local to a recursing function should be bound only to that
# one invocation, and should not trigger for other invocations.
#
with_test_prefix "local_x" {
gdb_test "tbreak recurser" ".*breakpoint.*"
gdb_test "cont" "Continuing.*recurser.*"
gdb_test "next" "if \\(x > 0.*" "next past local_x initialization"
gdb_test "watch local_x" \
"^(?:Hardware w|W)atchpoint $::decimal: local_x" \
"set local watch in recursive call"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: local_x.*New value = 2.*" \
"trigger local watch in recursive call"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
"self-delete local watch in recursive call"
}
# Repeat the preceding test, but this time use "recurser::local_x" as
# the variable to track.
with_test_prefix "recurser::local_x" {
gdb_test "cont" "Continuing.*marker6.*" "continue to marker6"
gdb_test "tbreak recurser" ".*breakpoint.*"
gdb_test "cont" "Continuing.*recurser.*" "continue to recurser"
gdb_test "next" "if \\(x > 0.*" "next past local_x initialization"
gdb_test "watch recurser::local_x" \
"^(?:Hardware w|W)atchpoint $::decimal: recurser::local_x" \
"set local watch in recursive call with explicit scope"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .*: recurser::local_x.*New value = 2.*" \
"trigger local watch with explicit scope in recursive call"
gdb_test "cont" "Continuing.*\[Ww\]atchpoint .* deleted because the program has left the block in.*which its expression is valid.*" \
"self-delete local watch with explicit scope in recursive call (2)"
}
# Disable everything so we can finish the program at full speed
gdb_test_no_output "disable" "disable in test_complex_watchpoint, second time"
if [target_info exists gdb,noresults] { return }
gdb_continue_to_end "continue to exit in test_complex_watchpoint"
}
}
proc test_watchpoint_and_breakpoint {} {
global gdb_prompt
# This is a test for PR breakpoints/7143, which involves setting a
# watchpoint right after you've reached a breakpoint.
if {[runto func3]} {
gdb_breakpoint [gdb_get_line_number "second x assignment"]
gdb_continue_to_breakpoint "second x assignment"
gdb_test "watch x" \
"^(?:Hardware w|W)atchpoint $::decimal: x"
gdb_test "next" \
".*atchpoint \[0-9\]+: x\r\n\r\nOld value = 0\r\nNew value = 1\r\n.*" \
"next after watch x"
gdb_test_no_output "delete \$bpnum" "delete watch x"
}
}
proc test_constant_watchpoint {} {
gdb_test "watch 5" "Cannot watch constant value `5'." "number is constant"
gdb_test "watch (int *)5" "Cannot watch constant value `\\(int \\*\\)5'." \
"number with cast is constant"
gdb_test "watch marker1" "Cannot watch constant value `marker1'." \
"marker1 is constant"
gdb_test "watch count + 6" ".*atchpoint \[0-9\]+: count \\+ 6"
gdb_test_no_output "delete \$bpnum" "delete watchpoint `count + 6'"
gdb_test "watch 7 + count" \
"^(?:Hardware w|W)atchpoint $::decimal: 7 \\+ count"
gdb_test_no_output "delete \$bpnum" "delete watchpoint `7 + count'"
}
proc test_disable_enable_software_watchpoint {} {
# This is regression test for a bug that caused `enable' to fail
# for software watchpoints.
# Watch something not memory to force a software watchpoint.
gdb_test {watch $pc} "^(?:Hardware w|W)atchpoint $::decimal: .pc"
gdb_test_no_output "disable \$bpnum" "disable watchpoint `\$pc'"
gdb_test_no_output "enable \$bpnum" "reenable watchpoint `\$pc'"
gdb_test "info watchpoint \$bpnum" \
".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+.pc.*" \
"watchpoint `\$pc' is enabled"
gdb_test_no_output "delete \$bpnum" "delete watchpoint `\$pc'"
}
proc test_watch_location {} {
global gdb_prompt
gdb_breakpoint [gdb_get_line_number "func5 breakpoint here"]
gdb_continue_to_breakpoint "func5 breakpoint here"
# Check first if a null pointer can be dereferenced on the target.
gdb_test_multiple "p *null_ptr" "" {
-re "Cannot access memory at address 0x0.*$gdb_prompt $" {
gdb_test "watch -location null_ptr->p->x" \
"Cannot access memory at address 0x0"
}
-re ".*$gdb_prompt $" {
# Null pointer dereference is legitimate.
}
}
gdb_test "watch -location *x" "atchpoint .*: .*" "watch -location .x"
gdb_test "continue" \
"Continuing.*\[Ww\]atchpoint .*: .*New value = 27.*" \
"continue with watch -location"
gdb_test_no_output "delete \$bpnum" "delete watch -location"
}
# Tests watching areas larger than a word.
proc test_wide_location_1 {} {
global no_hw
global gdb_prompt
global allow_hw_watchpoint_tests_p
# This test watches two words on most 32-bit ABIs, and one word on
# most 64-bit ABIs.
# Platforms where the target can't watch such a large region
# should clear hw_expected below.
if { $no_hw || !$allow_hw_watchpoint_tests_p
|| [istarget arm*-*-*]
|| ([istarget powerpc*-*-*] && ![is_lp64_target])} {
set hw_expected 0
} else {
set hw_expected 1
}
gdb_breakpoint [gdb_get_line_number "func6 breakpoint here"]
gdb_continue_to_breakpoint "func6 breakpoint here"
if { $hw_expected } {
gdb_test "watch foo2" "Hardware watchpoint .*: .*"
gdb_test "continue" \
"Continuing.*Hardware watchpoint .*: .*New value = \\\{val = \\\{0, 11\\\}\\\}.*" \
"continue with watch foo2"
} else {
gdb_test "watch foo2" "atchpoint .*: .*"
set test "continue with watch foo2"
gdb_test_multiple "cont" $test {
-re "Continuing.*\[Ww\]atchpoint .*: .*New value = \\\{val = \\\{0, 11\\\}\\\}.*$gdb_prompt $" {
pass $test
}
-re "Could not insert hardware breakpoints:.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
# This may happen with remote targets that support
# hardware watchpoints. We only find out the
# watchpoint was too large, for example, at insert
# time. If GDB is ever adjusted to downgrade the
# watchpoint automatically in this case, this match
# should be removed.
pass $test
}
}
}
gdb_test_no_output "delete \$bpnum" "delete watch foo2"
}
proc test_wide_location_2 {} {
global no_hw
global gdb_prompt
global allow_hw_watchpoint_tests_p
# This test watches four words on most 32-bit ABIs, and two words
# on 64-bit ABIs.
# Platforms where the target can't watch such a large region
# should clear hw_expected below.
if { $no_hw || !$allow_hw_watchpoint_tests_p
|| [istarget arm*-*-*]
|| [istarget powerpc*-*-*]} {
set hw_expected 0
} else {
set hw_expected 1
}
gdb_breakpoint [gdb_get_line_number "func7 breakpoint here"]
gdb_continue_to_breakpoint "func7 breakpoint here"
if { $hw_expected } {
gdb_test "watch foo4" "Hardware watchpoint .*: .*"
gdb_test "continue" \
"Continuing.*Hardware watchpoint .*: .*New value = \\\{val = \\\{0, 0, 0, 33\\\}\\\}.*" \
"continue with watch foo4"
} else {
gdb_test "watch foo4" "atchpoint .*: .*"
set test "continue with watch foo4"
gdb_test_multiple "cont" $test {
-re "Continuing.*\[Ww\]atchpoint .*: .*New value = \\\{val = \\\{0, 0, 0, 33\\\}\\\}.*$gdb_prompt $" {
pass $test
}
-re "Could not insert hardware breakpoints:.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
# This may happen with remote targets that support
# hardware watchpoints. We only find out the
# watchpoint was too large, for example, at insert
# time. If GDB is ever adjusted to downgrade the
# watchpoint automatically in this case, this match
# should be removed.
pass $test
}
}
}
gdb_test_no_output "delete \$bpnum" "delete watch foo4"
}
proc test_inaccessible_watchpoint {} {
global gdb_prompt
# This is a test for watchpoints on currently inaccessible (but later
# valid) memory.
if {[runto func4]} {
# Make sure we only allow memory access errors.
set msg "watchpoint refused to insert on nonexistent struct member"
gdb_test_multiple "watch struct1.nosuchmember" $msg {
-re ".*atchpoint \[0-9\]+: struct1.nosuchmember.*$gdb_prompt $" {
# PR breakpoints/9681
fail $msg
}
-re "There is no member named nosuchmember\\..*$gdb_prompt $" {
pass $msg
}
}
# See whether a watchpoint on a normal variable is a hardware
# watchpoint or not. The watchpoints on NULL should be hardware
# iff this one is.
set watchpoint_msg "Watchpoint"
gdb_test_multiple "watch global_ptr" "watch global_ptr" {
-re "Watchpoint \[0-9\]+: global_ptr\r\n.*$gdb_prompt $" {
pass "watch global_ptr"
}
-re "Hardware watchpoint \[0-9\]+: global_ptr\r\n.*$gdb_prompt $" {
set watchpoint_msg "Hardware watchpoint"
pass "watch global_ptr"
}
}
delete_breakpoints
# Make sure that we can watch a constant address, and correctly
# use a HW watchpoint if supported.
gdb_test "watch *(int *) 0" \
"$watchpoint_msg \[0-9\]+: \\*\\(int \\*\\) 0"
delete_breakpoints
# The same, but using -location through an indirection.
gdb_test "watch -location *global_ptr" \
"$watchpoint_msg \[0-9\]+: \-location \\*global_ptr"
delete_breakpoints
# This step requires two HW watchpoints. Since some platforms only
# have a single one, accept either SW or HW watchpoint in this case.
if {![allow_hw_watchpoint_multi_tests]} {
set watchpoint_msg "(Watchpoint|Hardware watchpoint)"
}
gdb_test "watch *global_ptr" "$watchpoint_msg \[0-9\]+: \\\*global_ptr"
gdb_test "set \$global_ptr_breakpoint_number = \$bpnum" ""
gdb_test "next" ".*global_ptr = buf.*" "global_ptr next"
gdb_test_multiple "next" "next over ptr init" {
-re ".*atchpoint \[0-9\]+: \\*global_ptr\r\n\r\nOld value = .*\r\nNew value = 3 .*\r\n.*$gdb_prompt $" {
# We can not test for <unknown> here because NULL may be readable.
# This test does rely on *NULL != 3.
pass "next over ptr init"
}
}
gdb_test_multiple "next" "next over buffer set" {
-re ".*atchpoint \[0-9\]+: \\*global_ptr\r\n\r\nOld value = 3 .*\r\nNew value = 7 .*\r\n.*$gdb_prompt $" {
pass "next over buffer set"
}
}
gdb_test "delete \$global_ptr_breakpoint_number" ""
gdb_test "watch **global_ptr_ptr" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr"
gdb_test "set \$global_ptr_ptr_breakpoint_number = \$bpnum" ""
gdb_test "next" ".*global_ptr_ptr = &global_ptr.*" "global_ptr_ptr next"
gdb_test "next" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr\[\r\n\]+Old value = .*\r\nNew value = 7 .*" "next over global_ptr_ptr init"
gdb_test "next" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr\[\r\n\]+Old value = 7 .*\r\nNew value = 9 .*" "next over global_ptr_ptr buffer set"
gdb_test "next" ".*atchpoint \[0-9\]+: \\*\\*global_ptr_ptr\[\r\n\]+Old value = 9 .*\r\nNew value = 5 .*" "next over global_ptr_ptr pointer advance"
gdb_test_no_output "delete \$global_ptr_ptr_breakpoint_number"
}
}
proc test_no_hw_watchpoints {} {
global testfile
global allow_hw_watchpoint_tests_p
clean_restart $testfile
# Verify that a user can force GDB to use "slow" watchpoints.
# (This proves rather little on kernels that don't support
# fast watchpoints, but still...)
#
if {![runto_main]} {
return
}
gdb_test_no_output "set can-use-hw-watchpoints 0" "disable fast watches"
gdb_test "show can-use-hw-watchpoints" \
"Debugger's willingness to use watchpoint hardware is 0." \
"show disable fast watches"
gdb_test "watch ival3 if count > 1" \
"^Watchpoint \[0-9\]*: ival3.*" \
"set slow conditional watch"
gdb_test "continue" \
"Watchpoint \[0-9\]*: ival3.*Old value = 1.*New value = 2.*" \
"trigger slow conditional watch"
gdb_test_no_output "delete \$bpnum" "delete watch ival3"
gdb_test "watch ival3 if count > 1 thread 1 " \
"watch ival3 if count > 1 thread 1 \r\nWatchpoint \[0-9\]*: ival3.*" \
"set slow condition watch w/thread"
gdb_test_no_output "delete \$bpnum" "delete watch w/condition and thread"
# We've explicitly disabled hardware watches. Verify that GDB
# refrains from using them.
#
gdb_test "rwatch ival3" \
"Can't set read/access watchpoint when hardware watchpoints are disabled." \
"rwatch disallowed when can-set-hw-watchpoints cleared"
gdb_test "awatch ival3" \
"Can't set read/access watchpoint when hardware watchpoints are disabled." \
"awatch disallowed when can-set-hw-watchpoints cleared"
# Re-enable hardware watchpoints if necessary.
if {$allow_hw_watchpoint_tests_p} {
gdb_test_no_output "set can-use-hw-watchpoints 1" ""
}
}
proc test_watchpoint_in_big_blob {} {
global gdb_prompt
# On native targets where we do hardware resource accounting, this
# may end up as a software watchpoint.
set ok 0
set test "watch buf"
gdb_test_multiple "watch buf" $test {
-re "Hardware watchpoint \[0-9\]+: buf.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
# This may happen with remote targets (where we don't do
# resource accounting) that support hardware watchpoints,
# when breakpoint always-inserted is on. The watchpoint
# was too large, for example. If GDB is ever adjusted to
# downgrade the watchpoint automatically in this case,
# this match should be removed. Note the breakpoint has
# been created, and is in the list, so it needs deleting.
pass $test
}
-re ".*atchpoint \[0-9\]+: buf.*$gdb_prompt $" {
pass $test
set ok 1
}
}
if { $ok } {
set test "watchpoint on buf hit"
gdb_test_multiple "cont" $test {
-re "Continuing.*atchpoint \[0-9\]+: buf\r\n\r\nOld value = .*testte\".*$gdb_prompt $" {
pass $test
}
-re "Could not insert hardware breakpoints:.*You may have requested too many hardware breakpoints/watchpoints.*$gdb_prompt $" {
# This may happen with remote targets that support
# hardware watchpoints. We only find out the
# watchpoint was too large, for example, at insert
# time. If GDB is ever adjusted to downgrade the
# watchpoint automatically in this case, this match
# should be removed.
pass $test
}
}
}
gdb_test_no_output "delete \$bpnum" "delete watch buf"
}
proc test_watch_register_location {} {
global no_hw
global allow_hw_watchpoint_tests_p
if {!$no_hw && $allow_hw_watchpoint_tests_p} {
# Non-memory read/access watchpoints are not supported, they would
# require software read/access watchpoint support (which is not
# currently available).
gdb_test "rwatch \$pc" \
"Expression cannot be implemented with read/access watchpoint..*" \
"rwatch disallowed for register based expression"
gdb_test "awatch \$pc" \
"Expression cannot be implemented with read/access watchpoint..*" \
"awatch disallowed for register based expression"
}
}
# Start with a fresh gdb.
set prev_timeout $timeout
set timeout 600
verbose "Timeout now 600 sec.\n"
test_no_hw_watchpoints
proc do_tests {} {
global testfile
global no_hw
global allow_hw_watchpoint_tests_p
clean_restart $testfile
if {$no_hw || !$allow_hw_watchpoint_tests_p} {
gdb_test_no_output "set can-use-hw-watchpoints 0"\
"disable fast watches, 1"
}
if {[initialize]} {
test_simple_watchpoint
test_disabling_watchpoints
if ![target_info exists gdb,cannot_call_functions] {
test_stepping
}
}
# Tests below don't rely on the markers and watchpoint set by
# `initialize' anymore.
clean_restart $testfile
if {$no_hw || !$allow_hw_watchpoint_tests_p} {
gdb_test_no_output "set can-use-hw-watchpoints 0" \
"disable fast watches, 2"
}
# Only enabled for some targets merely because it has not been tested
# elsewhere.
# On sparc-sun-sunos4.1.3, GDB was running all the way to the marker4
# breakpoint before stopping for the watchpoint. I don't know why.
if {[istarget "hppa*-*-*"]} {
test_watchpoint_triggered_in_syscall
}
test_complex_watchpoint
test_inaccessible_watchpoint
test_watchpoint_and_breakpoint
test_watchpoint_in_big_blob
test_constant_watchpoint
test_disable_enable_software_watchpoint
test_watch_location
test_wide_location_1
test_wide_location_2
test_watch_register_location
}
# On targets that can do hardware watchpoints, run the tests twice:
# once with hardware watchpoints enabled; another with hardware
# watchpoints force-disabled.
do_tests
if {$allow_hw_watchpoint_tests_p} {
with_test_prefix "no-hw" {
set no_hw 1
do_tests
}
}
# Restore old timeout
set timeout $prev_timeout
verbose "Timeout now $timeout sec.\n"