gdb/testsuite/gdb.trace/ftrace.exp

   1 # Copyright 2011-2018 Free Software Foundation, Inc.
   2 # This program is free software; you can redistribute it and/or modify
   3 # it under the terms of the GNU General Public License as published by
   4 # the Free Software Foundation; either version 3 of the License, or
   5 # (at your option) any later version.
   6 #
   7 # This program is distributed in the hope that it will be useful,
   8 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   9 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10 # GNU General Public License for more details.
  11 #
  12 # You should have received a copy of the GNU General Public License
  13 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  14
  15 load_lib "trace-support.exp"
  16
  17 standard_testfile
  18 set executable $testfile
  19 set expfile $testfile.exp
  20
  21 # Some targets have leading underscores on assembly symbols.
  22 set additional_flags [gdb_target_symbol_prefix_flags]
  23
  24 if [prepare_for_testing "failed to prepare" $executable $srcfile \
  25         [list debug $additional_flags]] {
  26     return -1
  27 }
  28
  29 if ![runto_main] {
  30     fail "can't run to main to check for trace support"
  31     return -1
  32 }
  33
  34 if ![gdb_target_supports_trace] {
  35     unsupported "target does not support trace"
  36     return -1
  37 }
  38
  39 set libipa [get_in_proc_agent]
  40 set remote_libipa [gdb_load_shlib $libipa]
  41
  42 # Can't use prepare_for_testing, because that splits compiling into
  43 # building objects and then linking, and we'd fail with "linker input
  44 # file unused because linking not done" when building the object.
  45
  46 if { [gdb_compile "$srcdir/$subdir/$srcfile" $binfile \
  47           executable [list debug $additional_flags shlib=$libipa] ] != "" } {
  48     untested "failed to compile"
  49     return -1
  50 }
  51 clean_restart ${executable}
  52
  53 if ![runto_main] {
  54     fail "can't run to main for ftrace tests"
  55     return 0
  56 }
  57
  58 proc run_trace_experiment {} {
  59
  60     gdb_test "continue" \
  61         ".*Breakpoint \[0-9\]+, begin .*" \
  62         "advance to trace begin"
  63
  64     gdb_test_no_output "tstart" "start trace experiment"
  65
  66     # Fast tracepoint can be set in signal handler, so gdb_collect in
  67     # IPA shouldn't call any non-async-signal-safe functions.  It is
  68     # impractical to list all non-async-signal-safe functions, and set
  69     # breakpoints on them, so choose malloc only in this test.
  70     gdb_test "b -q malloc"
  71
  72     # Performance-wise, gdb_collect in IPA shouldn't call any syscall
  73     # in order to keep fast tracepoint fast enough.
  74     global gdb_prompt
  75     set test "catch syscall"
  76     gdb_test_multiple $test $test {
  77         -re "The feature \'catch syscall\' is not supported.*\r\n$gdb_prompt $" {
  78         }
  79         -re ".*$gdb_prompt $" {
  80             pass $test
  81         }
  82     }
  83
  84     global decimal
  85     set test "advance through tracing"
  86     gdb_test_multiple "continue" $test {
  87         -re "Thread 2 .* hit Catchpoint $decimal \\(call to syscall .*\\).*\r\n$gdb_prompt $" {
  88             # IPA starts a helper thread, which calls accept.  Ignore it.
  89             send_gdb "continue\n"
  90             exp_continue
  91         }
  92         -re "Breakpoint $decimal, end .*$gdb_prompt $" {
  93             pass $test
  94         }
  95     }
  96
  97     gdb_test "tstatus" ".*Trace .*" "check on trace status"
  98
  99     gdb_test "tstop" "" ""
 100 }
 101
 102 proc test_fast_tracepoints {} {
 103     global gdb_prompt
 104
 105     set fourgood 0
 106
 107     gdb_breakpoint "begin" qualified
 108
 109     gdb_breakpoint "end" qualified
 110
 111     gdb_test "print gdb_agent_gdb_trampoline_buffer_error" ".*" ""
 112
 113     gdb_test "ftrace set_point" "Fast tracepoint .*" \
 114         "fast tracepoint at a long insn"
 115
 116     gdb_trace_setactions "collect at set_point: define actions" \
 117         "" \
 118         "collect globvar, anarg" "^$"
 119
 120     # Make a test of shorter fast tracepoints, 32-bit x86 only
 121
 122     if { [istarget "i?86-*-*"] } {
 123
 124         # A Linux target needs to be able to allocate trampolines in the
 125         # 16-bit range, check mmap_min_addr so we can warn testers.
 126         if { [istarget "i?86-*-linux*"] } {
 127
 128             set minaddr [exec sh -c "cat /proc/sys/vm/mmap_min_addr"]
 129
 130             if { [expr $minaddr > 64512] } {
 131                 warning "mmap_min_addr > 64512, fast tracepoint will fail"
 132                 warning "do \"sudo sysctl -w vm.mmap_min_addr=32768\" to adjust"
 133             }
 134         }
 135
 136         gdb_test_multiple "ftrace four_byter" "set 4-byte fast tracepoint" {
 137             -re "May not have a fast tracepoint at .*\r\n$gdb_prompt $" {
 138                 pass "4-byte fast tracepoint could not be set"
 139             }
 140             -re "Fast tracepoint .*\r\n$gdb_prompt $" {
 141                 pass "4-byte fast tracepoint is set"
 142                 set fourgood 1
 143             }
 144         }
 145
 146         if { $fourgood } {
 147
 148             gdb_trace_setactions "collect at four_byter: define actions" \
 149             "" \
 150             "collect globvar, anarg" "^$"
 151         }
 152     }
 153
 154     run_trace_experiment
 155
 156     gdb_test "tfind pc *set_point" "Found trace frame .*" \
 157         "tfind set_point frame, first time"
 158
 159     gdb_test "print globvar" " = 1"
 160
 161     gdb_test "tfind pc *set_point" "Found trace frame .*" \
 162         "tfind set_point frame, second time"
 163
 164     setup_kfail "gdb/13808" "x86_64-*-linux*"
 165     gdb_test "print anarg" " = 200"
 166
 167     gdb_test "tfind start" "Found trace frame .*" \
 168         "reset tfinding"
 169
 170     if { $fourgood } {
 171
 172         gdb_test "tfind pc *four_byter" "Found trace frame .*" \
 173             "tfind four_byter frame, first time"
 174
 175         gdb_test "print anarg" " = 101" \
 176             "look at collected local, first time"
 177
 178         gdb_test "tfind pc *four_byter" "Found trace frame .*" \
 179             "tfind four_byter frame, second time"
 180
 181         gdb_test "print anarg" " = 201" \
 182             "look at collected local, second time"
 183
 184     }
 185
 186     # If debugging with the remote target, try force disabling the
 187     # fast tracepoints RSP feature, and confirm fast tracepoints
 188     # can no longer be downloaded.
 189     set test "fast tracepoint could not be downloaded with the feature disabled"
 190     if [gdb_is_target_remote] {
 191         gdb_test "set remote fast-tracepoints-packet off"
 192
 193         gdb_test_multiple "tstart" $test {
 194             -re "warning: Target does not support fast tracepoints, downloading .* as regular tracepoint.*\r\n$gdb_prompt $" {
 195                 pass $test
 196             }
 197         }
 198     } else {
 199         unsupported $test
 200     }
 201 }
 202
 203 gdb_reinitialize_dir $srcdir/$subdir
 204
 205 if { [gdb_test "info sharedlibrary" ".*${remote_libipa}.*" "IPA loaded"] != 0 } {
 206     untested "could not find IPA lib loaded"
 207     return 1
 208 }
 209
 210 test_fast_tracepoints