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# Copyright 1998-2020 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/>.
# This test helps making sure QTro support doesn't regress. If the
# stub supports the newer qXfer:traceframe-info:read, then the QTro
# paths in the stub are never exercised. PR remote/15455 is an
# example of a regression that unfortunately went unnoticed for long.
load_lib trace-support.exp
standard_testfile
if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug nopie}]} {
return -1
}
clean_restart $testfile
if ![runto_main] {
fail "can't run to main to check for trace support"
return -1
}
# Check whether we're testing with the remote or extended-remote
# targets, and whether the target supports tracepoints.
if ![gdb_is_target_remote] {
return -1
}
if ![gdb_target_supports_trace] {
unsupported "current target does not support trace"
return -1
}
# Run a trace session, stop it, and then inspect the resulting trace
# frame (IOW, returns while tfind mode is active).
proc prepare_for_trace_disassembly { } {
global gdb_prompt
gdb_breakpoint "end" qualified
gdb_test "trace subr" "Tracepoint .*" \
"tracepoint at subr"
gdb_trace_setactions "define action" \
"" \
"collect parm" "^$"
gdb_test_no_output "tstart"
gdb_test "continue" ".*Breakpoint \[0-9\]+, end .*" \
"advance through tracing"
gdb_test "tstatus" ".*Collected 1 trace frame.*" \
"collected 1 trace frame"
gdb_test_no_output "tstop"
gdb_tfind_test "tfind start" "start" "0"
}
clean_restart $testfile
runto_main
# Trace once, issuing a tstatus, so that GDB tries
# qXfer:trace-frame-info:read.
prepare_for_trace_disassembly
# Now check whether the packet is supported.
set traceframe_info_supported -1
set test "probe for traceframe-info support"
gdb_test_multiple "show remote traceframe-info-packet" $test {
-re ".*Support for .* is auto-detected, currently (\[a-z\]*).*$gdb_prompt $" {
set status $expect_out(1,string)
if { $status == "enabled" } {
set traceframe_info_supported 1
} else {
set traceframe_info_supported 0
}
pass $test
}
}
if { $traceframe_info_supported == -1 } {
return -1
}
# Check whether we're testing with our own GDBserver.
set is_gdbserver [target_is_gdbserver]
if { $is_gdbserver == -1 } {
return -1
}
# Now disassemble (IOW, read from read-only memory) while inspecting a
# trace frame, twice. Once with qXfer:traceframe-info:read left to
# auto, and once with it disabled, exercising the QTro fallback path
# in the stub side.
foreach tfinfo { auto off } {
with_test_prefix "qXfer:traceframe-info:read $tfinfo" {
clean_restart $testfile
runto_main
gdb_test_no_output "set remote traceframe-info-packet $tfinfo"
prepare_for_trace_disassembly
set test "trace disassembly"
gdb_test_multiple "disassemble subr" $test {
-re "<(\.\[0-9\]+|)>:.*End of assembler dump.*$gdb_prompt $" {
pass $test
}
-re "Cannot access memory.*$gdb_prompt $" {
if { $traceframe_info_supported == 0 } {
# If qXfer:traceframe-info:read is not supported,
# then there should be QTro support.
fail $test
} elseif { $tfinfo == off && $is_gdbserver == 1 } {
# We we're testing with GDBserver, we know both
# qXfer:traceframe-info:read and QTro are
# supported (although supporting the former only
# would be sufficient), so issue a FAIL instead of
# UNSUPPORTED, giving us better visibility of QTro
# regressions.
fail $test
} else {
# Otherwise, qXfer:traceframe-info:read is
# supported, making QTro optional, so this isn't
# really a failure.
unsupported "$test (no QTro support)"
}
}
}
}
}
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