gdb/testsuite/gdb.trace/signal.exp

   1 #   Copyright 2016 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 is to test whether GDBserver or other remote stubs deliver signal
  17 # to the inferior while step over thread.  The program signal.c sends
  18 # signal SIGABRT to itself via kill syscall.  The test sets tracepoints
  19 # syscall instruction and the next one, and it is quite likely that
  20 # GDBserver gets the signal when it steps over thread and does the
  21 # collection.  If GDBserver doesn't deliver signal in thread step over,
  22 # one collection is got for one tracepoint hit.  Otherwise, there may
  23 # be two collections for one tracepoint hit, because tracepoint is
  24 # collected once before step over, the program goes into signal handler
  25 # (because signal is delivered in step over), and program goes back
  26 # to the tracepoint again (one more collection) after returns from
  27 # signal handler.
  28
  29 load_lib "trace-support.exp"
  30
  31 standard_testfile
  32
  33 if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
  34     return -1
  35 }
  36
  37 if ![runto_main] {
  38     fail "can't run to main to check for trace support"
  39     return -1
  40 }
  41
  42 if ![gdb_target_supports_trace] {
  43     unsupported "target does not support trace"
  44     return -1
  45 }
  46
  47 # Step 1, find the syscall instruction address.
  48
  49 set syscall_insn ""
  50
  51 # Define the syscall instruction for each target.
  52
  53 if { [istarget "i\[34567\]86-*-linux*"] || [istarget "x86_64-*-linux*"] } {
  54     set syscall_insn "\[ \t\](int|syscall|sysenter)\[ \t\]"
  55 } elseif { [istarget "aarch64*-*-linux*"] || [istarget "arm*-*-linux*"] } {
  56     set syscall_insn "\[ \t\](swi|svc)\[ \t\]"
  57 } else {
  58     unsupported "unknown syscall instruction"
  59     return -1
  60 }
  61
  62 # Start with a fresh gdb.
  63 clean_restart ${testfile}
  64 if ![runto_main] {
  65     fail "can't run to main"
  66     return -1
  67 }
  68
  69 gdb_test "break kill" "Breakpoint $decimal at .*"
  70 gdb_test "handle SIGABRT nostop noprint pass" ".*" "pass SIGABRT"
  71
  72 # Hit the breakpoint on $syscall for the first time.  In this time,
  73 # we will let PLT resolution done, and the number single steps we will
  74 # do later will be reduced.
  75 gdb_test "continue" "Continuing\\..*Breakpoint $decimal, (.* in |__libc_|)kill \\(\\).*" \
  76     "continue to kill, 1st time"
  77
  78 # Hit the breakpoint on $syscall for the second time.  In this time,
  79 # the address of syscall insn and next insn of syscall are recorded.
  80 gdb_test "continue" "Continuing\\..*Breakpoint $decimal, (.* in |__libc_|)kill \\(\\).*" \
  81     "continue to kill, 2nd time"
  82
  83 gdb_test "display/i \$pc" ".*"
  84
  85 # Single step until we see a syscall insn or we reach the
  86 # upper bound of loop iterations.
  87 set msg "find syscall insn in kill"
  88 set steps 0
  89 set max_steps 1000
  90 gdb_test_multiple "stepi" $msg {
  91     -re ".*$syscall_insn.*$gdb_prompt $" {
  92         pass $msg
  93     }
  94     -re "x/i .*=>.*\r\n$gdb_prompt $" {
  95         incr steps
  96         if {$steps == $max_steps} {
  97             fail $msg
  98         } else {
  99             send_gdb "stepi\n"
 100             exp_continue
 101         }
 102     }
 103 }
 104
 105 if {$steps == $max_steps} {
 106     return
 107 }
 108
 109 # Remove the display
 110 gdb_test_no_output "delete display 1"
 111
 112 set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"]
 113 set syscall_insn_next 0
 114 set test "x/2i \$pc"
 115 gdb_test_multiple $test $test {
 116     -re "$hex .*:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" {
 117         set syscall_insn_next $expect_out(1,string)
 118     }
 119 }
 120
 121 delete_breakpoints
 122 gdb_test "break start" "Breakpoint $decimal at .*"
 123 gdb_continue_to_breakpoint "continue to start"
 124
 125 gdb_assert { 0 == [get_integer_valueof "counter" "1"] } "counter is zero"
 126
 127 delete_breakpoints
 128
 129 # Step 2, set tracepoints on syscall instruction and the next one.
 130 # It is more likely to get signal on these two places when GDBserver
 131 # is doing step-over.
 132 gdb_test "trace *$syscall_insn_addr" "Tracepoint $decimal at .*" \
 133     "tracepoint on syscall instruction"
 134 set tpnum [get_integer_valueof "\$bpnum" 0]
 135 gdb_test "trace *$syscall_insn_next" "Tracepoint $decimal at .*" \
 136     "tracepoint on instruction following syscall instruction"
 137
 138 gdb_test "break end" "Breakpoint $decimal at .*"
 139
 140 gdb_test_no_output "tstart"
 141 gdb_test "continue" ".*Breakpoint.* end .*at.*$srcfile.*" \
 142     "continue to end"
 143 gdb_test_no_output "tstop"
 144
 145 set iterations [get_integer_valueof "iterations" "0"]
 146
 147 gdb_assert { $iterations == [get_integer_valueof "counter" "0"] } \
 148     "iterations equals to counter"
 149
 150 # Record the hit times of each tracepoint in this array.
 151 array set tracepoint_hits { }
 152 for { set i $tpnum } { $i < [expr $tpnum + 2] } { incr i } {
 153   set tracepoint_hits($i) 0
 154 }
 155
 156 while { 1 } {
 157    set test "tfind"
 158    set idx 0
 159    gdb_test_multiple $test $test {
 160         -re "Found trace frame $decimal, tracepoint ($decimal).*\r\n$gdb_prompt $" {
 161             set idx [expr $expect_out(1,string)]
 162             incr tracepoint_hits($idx)
 163         }
 164        -re "Target failed to find requested trace frame\..*\r\n$gdb_prompt $" {
 165            set idx 0
 166        }
 167    }
 168    if {$idx == 0} {
 169         break
 170    }
 171 }
 172
 173 # Step 3, check the number of collections on each tracepoint.
 174
 175 for { set i $tpnum } { $i < [expr $tpnum + 2] } { incr i } {
 176
 177     if { $tracepoint_hits($i) == $iterations } {
 178         pass "tracepoint $i hit $iterations times"
 179     } elseif { $tracepoint_hits($i) > $iterations } {
 180         # GDBserver deliver the signal while stepping over tracepoint,
 181         # so it is possible that a tracepoint is collected twice.
 182         pass "tracepoint $i hit $iterations times (spurious collection)"
 183     } else {
 184         fail "tracepoint $i hit $iterations times"
 185     }
 186 }