gdb/testsuite/gdb.trace/qtro.exp

   1 #   Copyright 1998-2022 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 $srcfile {debug nopie}]} {
  26     return -1
  27 }
  28
  29 if ![runto_main] {
  30     return -1
  31 }
  32
  33 # Check whether we're testing with the remote or extended-remote
  34 # targets, and whether the target supports tracepoints.
  35
  36 if ![gdb_is_target_remote] {
  37     return -1
  38 }
  39
  40 if ![gdb_target_supports_trace] {
  41     unsupported "current target does not support trace"
  42     return -1
  43 }
  44
  45 # Run a trace session, stop it, and then inspect the resulting trace
  46 # frame (IOW, returns while tfind mode is active).
  47 proc prepare_for_trace_disassembly { } {
  48     global gdb_prompt
  49     gdb_breakpoint "end" qualified
  50
  51     gdb_test "trace subr" "Tracepoint .*" \
  52         "tracepoint at subr"
  53
  54     gdb_trace_setactions "define action" \
  55         "" \
  56         "collect parm" "^$"
  57
  58     gdb_test_no_output "tstart"
  59
  60     gdb_test "continue" ".*Breakpoint \[0-9\]+, end .*" \
  61         "advance through tracing"
  62
  63     gdb_test "tstatus" ".*Collected 1 trace frame.*" \
  64         "collected 1 trace frame"
  65
  66     gdb_test_no_output "tstop"
  67
  68     gdb_tfind_test "tfind start" "start" "0"
  69 }
  70
  71 clean_restart $testfile
  72 runto_main
  73
  74 # Trace once, issuing a tstatus, so that GDB tries
  75 # qXfer:trace-frame-info:read.
  76 prepare_for_trace_disassembly
  77
  78 # Now check whether the packet is supported.
  79 set traceframe_info_supported -1
  80 set test "probe for traceframe-info support"
  81 gdb_test_multiple "show remote traceframe-info-packet" $test {
  82     -re ".*Support for .* is auto-detected, currently (\[a-z\]*).*$gdb_prompt $" {
  83         set status $expect_out(1,string)
  84
  85         if { $status == "enabled" } {
  86             set traceframe_info_supported 1
  87         } else {
  88             set traceframe_info_supported 0
  89         }
  90
  91         pass $test
  92     }
  93 }
  94 if { $traceframe_info_supported == -1 } {
  95     return -1
  96 }
  97
  98 # Check whether we're testing with our own GDBserver.
  99 set is_gdbserver [target_is_gdbserver]
 100 if { $is_gdbserver == -1 } {
 101     return -1
 102 }
 103
 104 # Now disassemble (IOW, read from read-only memory) while inspecting a
 105 # trace frame, twice.  Once with qXfer:traceframe-info:read left to
 106 # auto, and once with it disabled, exercising the QTro fallback path
 107 # in the stub side.
 108 foreach tfinfo { auto off } {
 109     with_test_prefix "qXfer:traceframe-info:read $tfinfo" {
 110
 111         clean_restart $testfile
 112         runto_main
 113         gdb_test_no_output "set remote traceframe-info-packet $tfinfo"
 114
 115         prepare_for_trace_disassembly
 116
 117         set test "trace disassembly"
 118         gdb_test_multiple "disassemble subr" $test {
 119             -re "<(\.\[0-9\]+|)>:.*End of assembler dump.*$gdb_prompt $" {
 120                 pass $test
 121             }
 122             -re "Cannot access memory.*$gdb_prompt $" {
 123                 if { $traceframe_info_supported == 0 } {
 124                     # If qXfer:traceframe-info:read is not supported,
 125                     # then there should be QTro support.
 126                     fail $test
 127                 } elseif { $tfinfo == off && $is_gdbserver == 1 } {
 128                     # We we're testing with GDBserver, we know both
 129                     # qXfer:traceframe-info:read and QTro are
 130                     # supported (although supporting the former only
 131                     # would be sufficient), so issue a FAIL instead of
 132                     # UNSUPPORTED, giving us better visibility of QTro
 133                     # regressions.
 134                     fail $test
 135                 } else {
 136                     # Otherwise, qXfer:traceframe-info:read is
 137                     # supported, making QTro optional, so this isn't
 138                     # really a failure.
 139                     unsupported "$test (no QTro support)"
 140                 }
 141             }
 142         }
 143     }
 144 }