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 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     fail "can't run to main to check for trace support"
  40     return -1
  41 }
  42
  43 if ![gdb_target_supports_trace] {
  44     unsupported "target does not support trace"
  45     return -1
  46 }
  47
  48 set libipa [get_in_proc_agent]
  49 set remote_libipa [gdb_load_shlib $libipa]
  50
  51 # Can't use prepare_for_testing, because that splits compiling into
  52 # building objects and then linking, and we'd fail with "linker input
  53 # file unused because linking not done" when building the object.
  54
  55 if { [gdb_compile "$srcdir/$subdir/$srcfile" $binfile \
  56           executable [list debug $additional_flags shlib=$libipa] ] != "" } {
  57     untested "failed to compile"
  58     return -1
  59 }
  60 clean_restart ${executable}
  61
  62 if ![runto_main] {
  63     fail "can't run to main for ftrace tests"
  64     return 0
  65 }
  66
  67 proc run_trace_experiment {} {
  68
  69     gdb_test "continue" \
  70         ".*Breakpoint \[0-9\]+, begin .*" \
  71         "advance to trace begin"
  72
  73     gdb_test_no_output "tstart" "start trace experiment"
  74
  75     # Fast tracepoint can be set in signal handler, so gdb_collect in
  76     # IPA shouldn't call any non-async-signal-safe functions.  It is
  77     # impractical to list all non-async-signal-safe functions, and set
  78     # breakpoints on them, so choose malloc only in this test.
  79     gdb_test "b -q malloc"
  80
  81     # Performance-wise, gdb_collect in IPA shouldn't call any syscall
  82     # in order to keep fast tracepoint fast enough.
  83     global gdb_prompt
  84     set test "catch syscall"
  85     gdb_test_multiple $test $test {
  86         -re "The feature \'catch syscall\' is not supported.*\r\n$gdb_prompt $" {
  87         }
  88         -re ".*$gdb_prompt $" {
  89             pass $test
  90         }
  91     }
  92
  93     global decimal
  94     set test "advance through tracing"
  95     gdb_test_multiple "continue" $test {
  96         -re "Thread 2 .* hit Catchpoint $decimal \\(call to syscall .*\\).*\r\n$gdb_prompt $" {
  97             # IPA starts a helper thread, which calls accept.  Ignore it.
  98             send_gdb "continue\n"
  99             exp_continue
 100         }
 101         -re "Breakpoint $decimal, end .*$gdb_prompt $" {
 102             pass $test
 103         }
 104     }
 105
 106     gdb_test "tstatus" ".*Trace .*" "check on trace status"
 107
 108     gdb_test "tstop" "" ""
 109 }
 110
 111 proc test_fast_tracepoints {} {
 112     global gdb_prompt
 113
 114     set fourgood 0
 115
 116     gdb_breakpoint "begin" qualified
 117
 118     gdb_breakpoint "end" qualified
 119
 120     gdb_test "print gdb_agent_gdb_trampoline_buffer_error" ".*" ""
 121
 122     gdb_test "ftrace set_point" "Fast tracepoint .*" \
 123         "fast tracepoint at a long insn"
 124
 125     gdb_trace_setactions "collect at set_point: define actions" \
 126         "" \
 127         "collect globvar, anarg" "^$"
 128
 129     # Make a test of shorter fast tracepoints, 32-bit x86 only
 130
 131     if { [istarget "i?86-*-*"] } {
 132
 133         # A Linux target needs to be able to allocate trampolines in the
 134         # 16-bit range, check mmap_min_addr so we can warn testers.
 135         if { [istarget "i?86-*-linux*"] } {
 136
 137             set minaddr [exec sh -c "cat /proc/sys/vm/mmap_min_addr"]
 138
 139             if { [expr $minaddr > 64512] } {
 140                 warning "mmap_min_addr > 64512, fast tracepoint will fail"
 141                 warning "do \"sudo sysctl -w vm.mmap_min_addr=32768\" to adjust"
 142             }
 143         }
 144
 145         gdb_test_multiple "ftrace four_byter" "set 4-byte fast tracepoint" {
 146             -re "May not have a fast tracepoint at .*\r\n$gdb_prompt $" {
 147                 pass "4-byte fast tracepoint could not be set"
 148             }
 149             -re "Fast tracepoint .*\r\n$gdb_prompt $" {
 150                 pass "4-byte fast tracepoint is set"
 151                 set fourgood 1
 152             }
 153         }
 154
 155         if { $fourgood } {
 156
 157             gdb_trace_setactions "collect at four_byter: define actions" \
 158             "" \
 159             "collect globvar, anarg" "^$"
 160         }
 161     }
 162
 163     run_trace_experiment
 164
 165     gdb_test "tfind pc *set_point" "Found trace frame .*" \
 166         "tfind set_point frame, first time"
 167
 168     gdb_test "print globvar" " = 1"
 169
 170     gdb_test "tfind pc *set_point" "Found trace frame .*" \
 171         "tfind set_point frame, second time"
 172
 173     setup_kfail "gdb/13808" "x86_64-*-linux*"
 174     gdb_test "print anarg" " = 200"
 175
 176     gdb_test "tfind start" "Found trace frame .*" \
 177         "reset tfinding"
 178
 179     if { $fourgood } {
 180
 181         gdb_test "tfind pc *four_byter" "Found trace frame .*" \
 182             "tfind four_byter frame, first time"
 183
 184         gdb_test "print anarg" " = 101" \
 185             "look at collected local, first time"
 186
 187         gdb_test "tfind pc *four_byter" "Found trace frame .*" \
 188             "tfind four_byter frame, second time"
 189
 190         gdb_test "print anarg" " = 201" \
 191             "look at collected local, second time"
 192
 193     }
 194
 195     # If debugging with the remote target, try force disabling the
 196     # fast tracepoints RSP feature, and confirm fast tracepoints
 197     # can no longer be downloaded.
 198     set test "fast tracepoint could not be downloaded with the feature disabled"
 199     if [gdb_is_target_remote] {
 200         gdb_test "set remote fast-tracepoints-packet off"
 201
 202         gdb_test_multiple "tstart" $test {
 203             -re "warning: Target does not support fast tracepoints, downloading .* as regular tracepoint.*\r\n$gdb_prompt $" {
 204                 pass $test
 205             }
 206         }
 207     } else {
 208         unsupported $test
 209     }
 210 }
 211
 212 gdb_reinitialize_dir $srcdir/$subdir
 213
 214 if { [gdb_test "info sharedlibrary" ".*${remote_libipa}.*" "IPA loaded"] != 0 } {
 215     untested "could not find IPA lib loaded"
 216     return 1
 217 }
 218
 219 test_fast_tracepoints