gdb/testsuite/gdb.trace/qtro.exp

   1 #   Copyright 1998-2020 Free Software Foundation, Inc.
   2 #
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 # This test helps making sure QTro support doesn't regress.  If the
  17 # stub supports the newer qXfer:traceframe-info:read, then the QTro
  18 # paths in the stub are never exercised.  PR remote/15455 is an
  19 # example of a regression that unfortunately went unnoticed for long.
  20
  21 load_lib trace-support.exp
  22
  23 standard_testfile
  24
  25 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug nopie}]} {
  26     return -1
  27 }
  28 clean_restart $testfile
  29
  30 if ![runto_main] {
  31     fail "can't run to main to check for trace support"
  32     return -1
  33 }
  34
  35 # Check whether we're testing with the remote or extended-remote
  36 # targets, and whether the target supports tracepoints.
  37
  38 if ![gdb_is_target_remote] {
  39     return -1
  40 }
  41
  42 if ![gdb_target_supports_trace] {
  43     unsupported "current target does not support trace"
  44     return -1
  45 }
  46
  47 # Run a trace session, stop it, and then inspect the resulting trace
  48 # frame (IOW, returns while tfind mode is active).
  49 proc prepare_for_trace_disassembly { } {
  50     global gdb_prompt
  51     gdb_breakpoint "end" qualified
  52
  53     gdb_test "trace subr" "Tracepoint .*" \
  54         "tracepoint at subr"
  55
  56     gdb_trace_setactions "define action" \
  57         "" \
  58         "collect parm" "^$"
  59
  60     gdb_test_no_output "tstart"
  61
  62     gdb_test "continue" ".*Breakpoint \[0-9\]+, end .*" \
  63         "advance through tracing"
  64
  65     gdb_test "tstatus" ".*Collected 1 trace frame.*" \
  66         "collected 1 trace frame"
  67
  68     gdb_test_no_output "tstop"
  69
  70     gdb_tfind_test "tfind start" "start" "0"
  71 }
  72
  73 clean_restart $testfile
  74 runto_main
  75
  76 # Trace once, issuing a tstatus, so that GDB tries
  77 # qXfer:trace-frame-info:read.
  78 prepare_for_trace_disassembly
  79
  80 # Now check whether the packet is supported.
  81 set traceframe_info_supported -1
  82 set test "probe for traceframe-info support"
  83 gdb_test_multiple "show remote traceframe-info-packet" $test {
  84     -re ".*Support for .* is auto-detected, currently (\[a-z\]*).*$gdb_prompt $" {
  85         set status $expect_out(1,string)
  86
  87         if { $status == "enabled" } {
  88             set traceframe_info_supported 1
  89         } else {
  90             set traceframe_info_supported 0
  91         }
  92
  93         pass $test
  94     }
  95 }
  96 if { $traceframe_info_supported == -1 } {
  97     return -1
  98 }
  99
 100 # Check whether we're testing with our own GDBserver.
 101 set is_gdbserver [target_is_gdbserver]
 102 if { $is_gdbserver == -1 } {
 103     return -1
 104 }
 105
 106 # Now disassemble (IOW, read from read-only memory) while inspecting a
 107 # trace frame, twice.  Once with qXfer:traceframe-info:read left to
 108 # auto, and once with it disabled, exercising the QTro fallback path
 109 # in the stub side.
 110 foreach tfinfo { auto off } {
 111     with_test_prefix "qXfer:traceframe-info:read $tfinfo" {
 112
 113         clean_restart $testfile
 114         runto_main
 115         gdb_test_no_output "set remote traceframe-info-packet $tfinfo"
 116
 117         prepare_for_trace_disassembly
 118
 119         set test "trace disassembly"
 120         gdb_test_multiple "disassemble subr" $test {
 121             -re "<(\.\[0-9\]+|)>:.*End of assembler dump.*$gdb_prompt $" {
 122                 pass $test
 123             }
 124             -re "Cannot access memory.*$gdb_prompt $" {
 125                 if { $traceframe_info_supported == 0 } {
 126                     # If qXfer:traceframe-info:read is not supported,
 127                     # then there should be QTro support.
 128                     fail $test
 129                 } elseif { $tfinfo == off && $is_gdbserver == 1 } {
 130                     # We we're testing with GDBserver, we know both
 131                     # qXfer:traceframe-info:read and QTro are
 132                     # supported (although supporting the former only
 133                     # would be sufficient), so issue a FAIL instead of
 134                     # UNSUPPORTED, giving us better visibility of QTro
 135                     # regressions.
 136                     fail $test
 137                 } else {
 138                     # Otherwise, qXfer:traceframe-info:read is
 139                     # supported, making QTro optional, so this isn't
 140                     # really a failure.
 141                     unsupported "$test (no QTro support)"
 142                 }
 143             }
 144         }
 145     }
 146 }