# 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 . 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