187 lines
5.8 KiB
Plaintext
187 lines
5.8 KiB
Plaintext
# Copyright 2016-2017 Free Software Foundation, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This is to test whether GDBserver or other remote stubs deliver signal
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# to the inferior while step over thread. The program signal.c sends
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# signal SIGABRT to itself via kill syscall. The test sets tracepoints
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# syscall instruction and the next one, and it is quite likely that
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# GDBserver gets the signal when it steps over thread and does the
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# collection. If GDBserver doesn't deliver signal in thread step over,
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# one collection is got for one tracepoint hit. Otherwise, there may
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# be two collections for one tracepoint hit, because tracepoint is
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# collected once before step over, the program goes into signal handler
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# (because signal is delivered in step over), and program goes back
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# to the tracepoint again (one more collection) after returns from
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# signal handler.
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load_lib "trace-support.exp"
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standard_testfile
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if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
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return -1
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}
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if ![runto_main] {
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fail "can't run to main to check for trace support"
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return -1
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}
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if ![gdb_target_supports_trace] {
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unsupported "target does not support trace"
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return -1
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}
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# Step 1, find the syscall instruction address.
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set syscall_insn ""
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# Define the syscall instruction for each target.
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if { [istarget "i\[34567\]86-*-linux*"] || [istarget "x86_64-*-linux*"] } {
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set syscall_insn "\[ \t\](int|syscall|sysenter)\[ \t\]"
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} elseif { [istarget "aarch64*-*-linux*"] || [istarget "arm*-*-linux*"] } {
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set syscall_insn "\[ \t\](swi|svc)\[ \t\]"
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} else {
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unsupported "unknown syscall instruction"
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return -1
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}
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# Start with a fresh gdb.
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clean_restart ${testfile}
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if ![runto_main] {
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fail "can't run to main"
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return -1
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}
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gdb_test "break kill" "Breakpoint $decimal at .*"
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gdb_test "handle SIGABRT nostop noprint pass" ".*" "pass SIGABRT"
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# Hit the breakpoint on $syscall for the first time. In this time,
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# we will let PLT resolution done, and the number single steps we will
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# do later will be reduced.
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gdb_test "continue" "Continuing\\..*Breakpoint $decimal, (.* in |__libc_|)kill \\(\\).*" \
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"continue to kill, 1st time"
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# Hit the breakpoint on $syscall for the second time. In this time,
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# the address of syscall insn and next insn of syscall are recorded.
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gdb_test "continue" "Continuing\\..*Breakpoint $decimal, (.* in |__libc_|)kill \\(\\).*" \
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"continue to kill, 2nd time"
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gdb_test "display/i \$pc" ".*"
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# Single step until we see a syscall insn or we reach the
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# upper bound of loop iterations.
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set msg "find syscall insn in kill"
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set steps 0
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set max_steps 1000
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gdb_test_multiple "stepi" $msg {
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-re ".*$syscall_insn.*$gdb_prompt $" {
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pass $msg
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}
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-re "x/i .*=>.*\r\n$gdb_prompt $" {
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incr steps
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if {$steps == $max_steps} {
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fail $msg
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} else {
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send_gdb "stepi\n"
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exp_continue
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}
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}
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}
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if {$steps == $max_steps} {
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return
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}
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# Remove the display
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gdb_test_no_output "delete display 1"
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set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"]
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set syscall_insn_next 0
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set test "x/2i \$pc"
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gdb_test_multiple $test $test {
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-re "$hex .*:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" {
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set syscall_insn_next $expect_out(1,string)
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}
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}
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delete_breakpoints
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gdb_test "break start" "Breakpoint $decimal at .*"
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gdb_continue_to_breakpoint "continue to start"
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gdb_assert { 0 == [get_integer_valueof "counter" "1"] } "counter is zero"
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delete_breakpoints
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# Step 2, set tracepoints on syscall instruction and the next one.
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# It is more likely to get signal on these two places when GDBserver
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# is doing step-over.
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gdb_test "trace *$syscall_insn_addr" "Tracepoint $decimal at .*" \
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"tracepoint on syscall instruction"
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set tpnum [get_integer_valueof "\$bpnum" 0]
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gdb_test "trace *$syscall_insn_next" "Tracepoint $decimal at .*" \
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"tracepoint on instruction following syscall instruction"
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gdb_test "break end" "Breakpoint $decimal at .*"
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gdb_test_no_output "tstart"
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gdb_test "continue" ".*Breakpoint.* end .*at.*$srcfile.*" \
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"continue to end"
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gdb_test_no_output "tstop"
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set iterations [get_integer_valueof "iterations" "0"]
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gdb_assert { $iterations == [get_integer_valueof "counter" "0"] } \
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"iterations equals to counter"
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# Record the hit times of each tracepoint in this array.
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array set tracepoint_hits { }
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for { set i $tpnum } { $i < [expr $tpnum + 2] } { incr i } {
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set tracepoint_hits($i) 0
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}
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while { 1 } {
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set test "tfind"
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set idx 0
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gdb_test_multiple $test $test {
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-re "Found trace frame $decimal, tracepoint ($decimal).*\r\n$gdb_prompt $" {
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set idx [expr $expect_out(1,string)]
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incr tracepoint_hits($idx)
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}
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-re "Target failed to find requested trace frame\..*\r\n$gdb_prompt $" {
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set idx 0
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}
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}
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if {$idx == 0} {
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break
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}
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}
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# Step 3, check the number of collections on each tracepoint.
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for { set i $tpnum } { $i < [expr $tpnum + 2] } { incr i } {
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if { $tracepoint_hits($i) == $iterations } {
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pass "tracepoint $i hit $iterations times"
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} elseif { $tracepoint_hits($i) > $iterations } {
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# GDBserver deliver the signal while stepping over tracepoint,
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# so it is possible that a tracepoint is collected twice.
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pass "tracepoint $i hit $iterations times (spurious collection)"
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} else {
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fail "tracepoint $i hit $iterations times"
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}
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}
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