| 1 | # Copyright 2016-2019 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 | if [target_info exists gdb,nosignals] { |
| 32 | verbose "Skipping signal.exp because of nosignals." |
| 33 | return -1 |
| 34 | } |
| 35 | |
| 36 | standard_testfile |
| 37 | |
| 38 | if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} { |
| 39 | return -1 |
| 40 | } |
| 41 | |
| 42 | if ![runto_main] { |
| 43 | fail "can't run to main to check for trace support" |
| 44 | return -1 |
| 45 | } |
| 46 | |
| 47 | if ![gdb_target_supports_trace] { |
| 48 | unsupported "target does not support trace" |
| 49 | return -1 |
| 50 | } |
| 51 | |
| 52 | # Step 1, find the syscall instruction address. |
| 53 | |
| 54 | set syscall_insn "" |
| 55 | |
| 56 | # Define the syscall instruction for each target. |
| 57 | |
| 58 | if { [istarget "i\[34567\]86-*-linux*"] || [istarget "x86_64-*-linux*"] } { |
| 59 | set syscall_insn "\[ \t\](int|syscall|sysenter)\[ \t\]" |
| 60 | } elseif { [istarget "aarch64*-*-linux*"] || [istarget "arm*-*-linux*"] } { |
| 61 | set syscall_insn "\[ \t\](swi|svc)\[ \t\]" |
| 62 | } else { |
| 63 | unsupported "unknown syscall instruction" |
| 64 | return -1 |
| 65 | } |
| 66 | |
| 67 | # Start with a fresh gdb. |
| 68 | clean_restart ${testfile} |
| 69 | if ![runto_main] { |
| 70 | fail "can't run to main" |
| 71 | return -1 |
| 72 | } |
| 73 | |
| 74 | gdb_breakpoint "kill" qualified |
| 75 | gdb_test "handle SIGABRT nostop noprint pass" ".*" "pass SIGABRT" |
| 76 | |
| 77 | # Hit the breakpoint on $syscall for the first time. In this time, |
| 78 | # we will let PLT resolution done, and the number single steps we will |
| 79 | # do later will be reduced. |
| 80 | gdb_test "continue" "Continuing\\..*Breakpoint $decimal, (.* in |__libc_|)kill \\(\\).*" \ |
| 81 | "continue to kill, 1st time" |
| 82 | |
| 83 | # Hit the breakpoint on $syscall for the second time. In this time, |
| 84 | # the address of syscall insn and next insn of syscall are recorded. |
| 85 | gdb_test "continue" "Continuing\\..*Breakpoint $decimal, (.* in |__libc_|)kill \\(\\).*" \ |
| 86 | "continue to kill, 2nd time" |
| 87 | |
| 88 | gdb_test "display/i \$pc" ".*" |
| 89 | |
| 90 | # Single step until we see a syscall insn or we reach the |
| 91 | # upper bound of loop iterations. |
| 92 | set msg "find syscall insn in kill" |
| 93 | set steps 0 |
| 94 | set max_steps 1000 |
| 95 | gdb_test_multiple "stepi" $msg { |
| 96 | -re ".*$syscall_insn.*$gdb_prompt $" { |
| 97 | pass $msg |
| 98 | } |
| 99 | -re "x/i .*=>.*\r\n$gdb_prompt $" { |
| 100 | incr steps |
| 101 | if {$steps == $max_steps} { |
| 102 | fail $msg |
| 103 | } else { |
| 104 | send_gdb "stepi\n" |
| 105 | exp_continue |
| 106 | } |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | if {$steps == $max_steps} { |
| 111 | return |
| 112 | } |
| 113 | |
| 114 | # Remove the display |
| 115 | gdb_test_no_output "delete display 1" |
| 116 | |
| 117 | set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"] |
| 118 | set syscall_insn_next 0 |
| 119 | set test "x/2i \$pc" |
| 120 | gdb_test_multiple $test $test { |
| 121 | -re "$hex .*:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" { |
| 122 | set syscall_insn_next $expect_out(1,string) |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | delete_breakpoints |
| 127 | gdb_breakpoint "start" qualified |
| 128 | gdb_continue_to_breakpoint "continue to start" |
| 129 | |
| 130 | gdb_assert { 0 == [get_integer_valueof "counter" "1"] } "counter is zero" |
| 131 | |
| 132 | delete_breakpoints |
| 133 | |
| 134 | # Step 2, set tracepoints on syscall instruction and the next one. |
| 135 | # It is more likely to get signal on these two places when GDBserver |
| 136 | # is doing step-over. |
| 137 | gdb_test "trace *$syscall_insn_addr" "Tracepoint $decimal at .*" \ |
| 138 | "tracepoint on syscall instruction" |
| 139 | set tpnum [get_integer_valueof "\$bpnum" 0] |
| 140 | gdb_test "trace *$syscall_insn_next" "Tracepoint $decimal at .*" \ |
| 141 | "tracepoint on instruction following syscall instruction" |
| 142 | |
| 143 | gdb_breakpoint "end" qualified |
| 144 | |
| 145 | gdb_test_no_output "tstart" |
| 146 | gdb_test "continue" ".*Breakpoint.* end .*at.*$srcfile.*" \ |
| 147 | "continue to end" |
| 148 | gdb_test_no_output "tstop" |
| 149 | |
| 150 | set iterations [get_integer_valueof "iterations" "0"] |
| 151 | |
| 152 | gdb_assert { $iterations == [get_integer_valueof "counter" "0"] } \ |
| 153 | "iterations equals to counter" |
| 154 | |
| 155 | # Record the hit times of each tracepoint in this array. |
| 156 | array set tracepoint_hits { } |
| 157 | for { set i $tpnum } { $i < [expr $tpnum + 2] } { incr i } { |
| 158 | set tracepoint_hits($i) 0 |
| 159 | } |
| 160 | |
| 161 | while { 1 } { |
| 162 | set test "tfind" |
| 163 | set idx 0 |
| 164 | gdb_test_multiple $test $test { |
| 165 | -re "Found trace frame $decimal, tracepoint ($decimal).*\r\n$gdb_prompt $" { |
| 166 | set idx [expr $expect_out(1,string)] |
| 167 | incr tracepoint_hits($idx) |
| 168 | } |
| 169 | -re "Target failed to find requested trace frame\..*\r\n$gdb_prompt $" { |
| 170 | set idx 0 |
| 171 | } |
| 172 | } |
| 173 | if {$idx == 0} { |
| 174 | break |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | # Step 3, check the number of collections on each tracepoint. |
| 179 | |
| 180 | for { set i $tpnum } { $i < [expr $tpnum + 2] } { incr i } { |
| 181 | |
| 182 | if { $tracepoint_hits($i) == $iterations } { |
| 183 | pass "tracepoint $i hit $iterations times" |
| 184 | } elseif { $tracepoint_hits($i) > $iterations } { |
| 185 | # GDBserver deliver the signal while stepping over tracepoint, |
| 186 | # so it is possible that a tracepoint is collected twice. |
| 187 | pass "tracepoint $i hit $iterations times (spurious collection)" |
| 188 | } else { |
| 189 | fail "tracepoint $i hit $iterations times" |
| 190 | } |
| 191 | } |