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|
# Copyright 2011-2020 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/>.
load_lib "trace-support.exp"
if {[skip_shlib_tests]} {
return 0
}
standard_testfile
set executable $testfile
set expfile $testfile.exp
# Some targets have leading underscores on assembly symbols.
set additional_flags [gdb_target_symbol_prefix_flags]
if ![gdb_trace_common_supports_arch] {
unsupported "no trace-common.h support for arch"
return -1
}
if [prepare_for_testing "failed to prepare" $executable $srcfile \
[list debug $additional_flags]] {
return -1
}
if ![runto_main] {
fail "can't run to main to check for trace support"
return -1
}
if ![gdb_target_supports_trace] {
unsupported "target does not support trace"
return -1
}
set libipa [get_in_proc_agent]
set remote_libipa [gdb_load_shlib $libipa]
# Can't use prepare_for_testing, because that splits compiling into
# building objects and then linking, and we'd fail with "linker input
# file unused because linking not done" when building the object.
if { [gdb_compile "$srcdir/$subdir/$srcfile" $binfile \
executable [list debug nopie $additional_flags shlib=$libipa] ] != "" } {
untested "failed to compile"
return -1
}
clean_restart ${executable}
if ![runto_main] {
fail "can't run to main for ftrace tests"
return 0
}
proc run_trace_experiment {} {
gdb_test "continue" \
".*Breakpoint \[0-9\]+, begin .*" \
"advance to trace begin"
gdb_test_no_output "tstart" "start trace experiment"
# Fast tracepoint can be set in signal handler, so gdb_collect in
# IPA shouldn't call any non-async-signal-safe functions. It is
# impractical to list all non-async-signal-safe functions, and set
# breakpoints on them, so choose malloc only in this test.
gdb_test "b -q malloc"
# Performance-wise, gdb_collect in IPA shouldn't call any syscall
# in order to keep fast tracepoint fast enough.
global gdb_prompt
set test "catch syscall"
gdb_test_multiple $test $test {
-re "The feature \'catch syscall\' is not supported.*\r\n$gdb_prompt $" {
}
-re ".*$gdb_prompt $" {
pass $test
}
}
global decimal
set test "advance through tracing"
gdb_test_multiple "continue" $test {
-re "Thread 2 .* hit Catchpoint $decimal \\(call to syscall .*\\).*\r\n$gdb_prompt $" {
# IPA starts a helper thread, which calls accept. Ignore it.
send_gdb "continue\n"
exp_continue
}
-re "Breakpoint $decimal, end .*$gdb_prompt $" {
pass $test
}
}
gdb_test "tstatus" ".*Trace .*" "check on trace status"
gdb_test "tstop" "" ""
}
proc test_fast_tracepoints {} {
global gdb_prompt
set fourgood 0
gdb_breakpoint "begin" qualified
gdb_breakpoint "end" qualified
gdb_test "print gdb_agent_gdb_trampoline_buffer_error" ".*" ""
gdb_test "ftrace set_point" "Fast tracepoint .*" \
"fast tracepoint at a long insn"
gdb_trace_setactions "collect at set_point: define actions" \
"" \
"collect globvar, anarg" "^$"
# Make a test of shorter fast tracepoints, 32-bit x86 only
if { [istarget "i?86-*-*"] } {
# A Linux target needs to be able to allocate trampolines in the
# 16-bit range, check mmap_min_addr so we can warn testers.
if { [istarget "i?86-*-linux*"] } {
set minaddr [exec sh -c "cat /proc/sys/vm/mmap_min_addr"]
if { [expr $minaddr > 64512] } {
warning "mmap_min_addr > 64512, fast tracepoint will fail"
warning "do \"sudo sysctl -w vm.mmap_min_addr=32768\" to adjust"
}
}
gdb_test_multiple "ftrace four_byter" "set 4-byte fast tracepoint" {
-re "May not have a fast tracepoint at .*\r\n$gdb_prompt $" {
pass "4-byte fast tracepoint could not be set"
}
-re "Fast tracepoint .*\r\n$gdb_prompt $" {
pass "4-byte fast tracepoint is set"
set fourgood 1
}
}
if { $fourgood } {
gdb_trace_setactions "collect at four_byter: define actions" \
"" \
"collect globvar, anarg" "^$"
}
}
run_trace_experiment
gdb_test "tfind pc *set_point" "Found trace frame .*" \
"tfind set_point frame, first time"
gdb_test "print globvar" " = 1"
gdb_test "tfind pc *set_point" "Found trace frame .*" \
"tfind set_point frame, second time"
setup_kfail "gdb/13808" "x86_64-*-linux*"
gdb_test "print anarg" " = 200"
gdb_test "tfind start" "Found trace frame .*" \
"reset tfinding"
if { $fourgood } {
gdb_test "tfind pc *four_byter" "Found trace frame .*" \
"tfind four_byter frame, first time"
gdb_test "print anarg" " = 101" \
"look at collected local, first time"
gdb_test "tfind pc *four_byter" "Found trace frame .*" \
"tfind four_byter frame, second time"
gdb_test "print anarg" " = 201" \
"look at collected local, second time"
}
# If debugging with the remote target, try force disabling the
# fast tracepoints RSP feature, and confirm fast tracepoints
# can no longer be downloaded.
set test "fast tracepoint could not be downloaded with the feature disabled"
if [gdb_is_target_remote] {
gdb_test "set remote fast-tracepoints-packet off"
gdb_test_multiple "tstart" $test {
-re "warning: Target does not support fast tracepoints, downloading .* as regular tracepoint.*\r\n$gdb_prompt $" {
pass $test
}
}
} else {
unsupported $test
}
}
gdb_reinitialize_dir $srcdir/$subdir
if { [gdb_test "info sharedlibrary" ".*${remote_libipa}.*" "IPA loaded"] != 0 } {
untested "could not find IPA lib loaded"
return 1
}
test_fast_tracepoints
|
