gdb/testsuite/gdb.trace/ftrace.exp

   1 # Copyright 2011-2023 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 if {[skip_shlib_tests]} {
  18     return 0
  19 }
  20
  21 standard_testfile
  22 set executable $testfile
  23 set expfile $testfile.exp
  24
  25 # Some targets have leading underscores on assembly symbols.
  26 set additional_flags [gdb_target_symbol_prefix_flags]
  27
  28 if ![gdb_trace_common_supports_arch] {
  29     unsupported "no trace-common.h support for arch"
  30     return -1
  31 }
  32
  33 if [prepare_for_testing "failed to prepare" $executable $srcfile \
  34         [list debug $additional_flags]] {
  35     return -1
  36 }
  37
  38 if ![runto_main] {
  39     return -1
  40 }
  41
  42 if ![gdb_target_supports_trace] {
  43     unsupported "target does not support trace"
  44     return -1
  45 }
  46
  47 set libipa [get_in_proc_agent]
  48 set remote_libipa [gdb_load_shlib $libipa]
  49
  50 # Can't use prepare_for_testing, because that splits compiling into
  51 # building objects and then linking, and we'd fail with "linker input
  52 # file unused because linking not done" when building the object.
  53
  54 if { [gdb_compile "$srcdir/$subdir/$srcfile" $binfile \
  55           executable [list debug nopie $additional_flags shlib=$libipa] ] != "" } {
  56     untested "failed to compile"
  57     return -1
  58 }
  59 clean_restart ${executable}
  60
  61 if ![runto_main] {
  62     return 0
  63 }
  64
  65 proc run_trace_experiment {} {
  66
  67     gdb_test "continue" \
  68         ".*Breakpoint \[0-9\]+, begin .*" \
  69         "advance to trace begin"
  70
  71     gdb_test_no_output "tstart" "start trace experiment"
  72
  73     # Fast tracepoint can be set in signal handler, so gdb_collect in
  74     # IPA shouldn't call any non-async-signal-safe functions.  It is
  75     # impractical to list all non-async-signal-safe functions, and set
  76     # breakpoints on them, so choose malloc only in this test.
  77     gdb_test "b -q malloc"
  78
  79     # Performance-wise, gdb_collect in IPA shouldn't call any syscall
  80     # in order to keep fast tracepoint fast enough.
  81     global gdb_prompt
  82     set test "catch syscall"
  83     gdb_test_multiple $test $test {
  84         -re "The feature \'catch syscall\' is not supported.*\r\n$gdb_prompt $" {
  85         }
  86         -re ".*$gdb_prompt $" {
  87             pass $test
  88         }
  89     }
  90
  91     global decimal
  92     set test "advance through tracing"
  93     gdb_test_multiple "continue" $test {
  94         -re "Thread 2 .* hit Catchpoint $decimal \\(call to syscall .*\\).*\r\n$gdb_prompt $" {
  95             # IPA starts a helper thread, which calls accept.  Ignore it.
  96             send_gdb "continue\n"
  97             exp_continue
  98         }
  99         -re "Breakpoint $decimal, end .*$gdb_prompt $" {
 100             pass $test
 101         }
 102     }
 103
 104     gdb_test "tstatus" ".*Trace .*" "check on trace status"
 105
 106     gdb_test "tstop" "" ""
 107 }
 108
 109 proc test_fast_tracepoints {} {
 110     global gdb_prompt
 111
 112     set fourgood 0
 113
 114     gdb_breakpoint "begin" qualified
 115
 116     gdb_breakpoint "end" qualified
 117
 118     gdb_test "print gdb_agent_gdb_trampoline_buffer_error" ".*" ""
 119
 120     gdb_test "ftrace set_point" "Fast tracepoint .*" \
 121         "fast tracepoint at a long insn"
 122
 123     gdb_trace_setactions "collect at set_point: define actions" \
 124         "" \
 125         "collect globvar, anarg" "^$"
 126
 127     # Make a test of shorter fast tracepoints, 32-bit x86 only
 128
 129     if { [istarget "i?86-*-*"] } {
 130
 131         # A Linux target needs to be able to allocate trampolines in the
 132         # 16-bit range, check mmap_min_addr so we can warn testers.
 133         if { [istarget "i?86-*-linux*"] } {
 134
 135             set minaddr [exec sh -c "cat /proc/sys/vm/mmap_min_addr"]
 136
 137             if { [expr $minaddr > 64512] } {
 138                 warning "mmap_min_addr > 64512, fast tracepoint will fail"
 139                 warning "do \"sudo sysctl -w vm.mmap_min_addr=32768\" to adjust"
 140             }
 141         }
 142
 143         gdb_test_multiple "ftrace four_byter" "set 4-byte fast tracepoint" {
 144             -re "May not have a fast tracepoint at .*\r\n$gdb_prompt $" {
 145                 pass "4-byte fast tracepoint could not be set"
 146             }
 147             -re "Fast tracepoint .*\r\n$gdb_prompt $" {
 148                 pass "4-byte fast tracepoint is set"
 149                 set fourgood 1
 150             }
 151         }
 152
 153         if { $fourgood } {
 154
 155             gdb_trace_setactions "collect at four_byter: define actions" \
 156             "" \
 157             "collect globvar, anarg" "^$"
 158         }
 159     }
 160
 161     run_trace_experiment
 162
 163     gdb_test "tfind pc *set_point" "Found trace frame .*" \
 164         "tfind set_point frame, first time"
 165
 166     gdb_test "print globvar" " = 1"
 167
 168     gdb_test "tfind pc *set_point" "Found trace frame .*" \
 169         "tfind set_point frame, second time"
 170
 171     setup_kfail "gdb/13808" "x86_64-*-linux*"
 172     gdb_test "print anarg" " = 200"
 173
 174     gdb_test "tfind start" "Found trace frame .*" \
 175         "reset tfinding"
 176
 177     if { $fourgood } {
 178
 179         gdb_test "tfind pc *four_byter" "Found trace frame .*" \
 180             "tfind four_byter frame, first time"
 181
 182         gdb_test "print anarg" " = 101" \
 183             "look at collected local, first time"
 184
 185         gdb_test "tfind pc *four_byter" "Found trace frame .*" \
 186             "tfind four_byter frame, second time"
 187
 188         gdb_test "print anarg" " = 201" \
 189             "look at collected local, second time"
 190
 191     }
 192
 193     # If debugging with the remote target, try force disabling the
 194     # fast tracepoints RSP feature, and confirm fast tracepoints
 195     # can no longer be downloaded.
 196     set test "fast tracepoint could not be downloaded with the feature disabled"
 197     if [gdb_is_target_remote] {
 198         gdb_test "set remote fast-tracepoints-packet off"
 199
 200         gdb_test_multiple "tstart" $test {
 201             -re "warning: Target does not support fast tracepoints, downloading .* as regular tracepoint.*\r\n$gdb_prompt $" {
 202                 pass $test
 203             }
 204         }
 205     } else {
 206         unsupported $test
 207     }
 208 }
 209
 210 gdb_reinitialize_dir $srcdir/$subdir
 211
 212 if { [gdb_test "info sharedlibrary" ".*${remote_libipa}.*" "IPA loaded"] != 0 } {
 213     untested "could not find IPA lib loaded"
 214     return 1
 215 }
 216
 217 test_fast_tracepoints