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b811d2c2 | 1 | # Copyright 2016-2020 Free Software Foundation, Inc. |
5c5dc57f YQ |
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 | ||
8bca2978 SL |
31 | if [target_info exists gdb,nosignals] { |
32 | verbose "Skipping signal.exp because of nosignals." | |
33 | return -1 | |
34 | } | |
35 | ||
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36 | standard_testfile |
37 | ||
5b362f04 | 38 | if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} { |
5c5dc57f YQ |
39 | return -1 |
40 | } | |
41 | ||
42 | if ![runto_main] { | |
bc6c7af4 | 43 | fail "can't run to main to check for trace support" |
5c5dc57f YQ |
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] { | |
bc6c7af4 | 70 | fail "can't run to main" |
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71 | return -1 |
72 | } | |
73 | ||
194ed413 | 74 | gdb_breakpoint "kill" qualified |
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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 $expect_out(1,string) | |
123 | } | |
124 | } | |
125 | ||
126 | delete_breakpoints | |
194ed413 | 127 | gdb_breakpoint "start" qualified |
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128 | gdb_continue_to_breakpoint "continue to start" |
129 | ||
130 | gdb_assert { 0 == [get_integer_valueof "counter" "1"] } "counter is zero" | |
131 | ||
132 | delete_breakpoints | |
133 | ||
134 | # Step 2, set tracepoints on syscall instruction and the next one. | |
135 | # It is more likely to get signal on these two places when GDBserver | |
136 | # is doing step-over. | |
137 | gdb_test "trace *$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 $decimal at .*" \ | |
141 | "tracepoint on instruction following syscall instruction" | |
142 | ||
194ed413 | 143 | gdb_breakpoint "end" qualified |
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144 | |
145 | gdb_test_no_output "tstart" | |
146 | gdb_test "continue" ".*Breakpoint.* end .*at.*$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 } { | |
5b061e98 YQ |
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 | } | |
5c5dc57f | 191 | } |