1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
# Copyright 2016 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# This is to test whether GDBserver or other remote stubs deliver signal
# to the inferior while step over thread. The program signal.c sends
# signal SIGABRT to itself via kill syscall. The test sets tracepoints
# syscall instruction and the next one, and it is quite likely that
# GDBserver gets the signal when it steps over thread and does the
# collection. If GDBserver doesn't deliver signal in thread step over,
# one collection is got for one tracepoint hit. Otherwise, there may
# be two collections for one tracepoint hit, because tracepoint is
# collected once before step over, the program goes into signal handler
# (because signal is delivered in step over), and program goes back
# to the tracepoint again (one more collection) after returns from
# signal handler.
load_lib "trace-support.exp"
standard_testfile
if {[prepare_for_testing $testfile.exp $testfile $srcfile debug]} {
untested $testfile.exp
return -1
}
if ![runto_main] {
fail "Can't run to main to check for trace support"
return -1
}
if ![gdb_target_supports_trace] {
unsupported "target does not support trace"
return -1
}
# Step 1, find the syscall instruction address.
set syscall_insn ""
# Define the syscall instruction for each target.
if { [istarget "i\[34567\]86-*-linux*"] || [istarget "x86_64-*-linux*"] } {
set syscall_insn "\[ \t\](int|syscall|sysenter)\[ \t\]"
} elseif { [istarget "aarch64*-*-linux*"] || [istarget "arm*-*-linux*"] } {
set syscall_insn "\[ \t\](swi|svc)\[ \t\]"
} else {
unsupported "unknown syscall instruction"
return -1
}
# Start with a fresh gdb.
clean_restart ${testfile}
if ![runto_main] {
fail "Can't run to main"
return -1
}
gdb_test "break kill" "Breakpoint $decimal at .*"
gdb_test "handle SIGABRT nostop noprint pass" ".*" "pass SIGABRT"
# Hit the breakpoint on $syscall for the first time. In this time,
# we will let PLT resolution done, and the number single steps we will
# do later will be reduced.
gdb_test "continue" "Continuing\\..*Breakpoint $decimal, (.* in |__libc_|)kill \\(\\).*" \
"continue to kill, 1st time"
# Hit the breakpoint on $syscall for the second time. In this time,
# the address of syscall insn and next insn of syscall are recorded.
gdb_test "continue" "Continuing\\..*Breakpoint $decimal, (.* in |__libc_|)kill \\(\\).*" \
"continue to kill, 2nd time"
gdb_test "display/i \$pc" ".*"
# Single step until we see a syscall insn or we reach the
# upper bound of loop iterations.
set msg "find syscall insn in kill"
set steps 0
set max_steps 1000
gdb_test_multiple "stepi" $msg {
-re ".*$syscall_insn.*$gdb_prompt $" {
pass $msg
}
-re "x/i .*=>.*\r\n$gdb_prompt $" {
incr steps
if {$steps == $max_steps} {
fail $msg
} else {
send_gdb "stepi\n"
exp_continue
}
}
}
if {$steps == $max_steps} {
return
}
# Remove the display
gdb_test_no_output "delete display 1"
set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"]
set syscall_insn_next 0
set test "x/2i \$pc"
gdb_test_multiple $test $test {
-re "$hex .*:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" {
set syscall_insn_next $expect_out(1,string)
}
}
delete_breakpoints
gdb_test "break start" "Breakpoint $decimal at .*"
gdb_continue_to_breakpoint "continue to start"
gdb_assert { 0 == [get_integer_valueof "counter" "1"] } "counter is zero"
delete_breakpoints
# Step 2, set tracepoints on syscall instruction and the next one.
# It is more likely to get signal on these two places when GDBserver
# is doing step-over.
gdb_test "trace *$syscall_insn_addr" "Tracepoint $decimal at .*" \
"tracepoint on syscall instruction"
set tpnum [get_integer_valueof "\$bpnum" 0]
gdb_test "trace *$syscall_insn_next" "Tracepoint $decimal at .*" \
"tracepoint on instruction following syscall instruction"
gdb_test "break end" "Breakpoint $decimal at .*"
gdb_test_no_output "tstart"
gdb_test "continue" ".*Breakpoint.* end .*at.*$srcfile.*" \
"continue to end"
gdb_test_no_output "tstop"
set iterations [get_integer_valueof "iterations" "0"]
gdb_assert { $iterations == [get_integer_valueof "counter" "0"] } \
"iterations equals to counter"
# Record the hit times of each tracepoint in this array.
array set tracepoint_hits { }
for { set i $tpnum } { $i < [expr $tpnum + 2] } { incr i } {
set tracepoint_hits($i) 0
}
while { 1 } {
set test "tfind"
set idx 0
gdb_test_multiple $test $test {
-re "Found trace frame $decimal, tracepoint ($decimal).*\r\n$gdb_prompt $" {
set idx [expr $expect_out(1,string)]
incr tracepoint_hits($idx)
}
-re "Target failed to find requested trace frame\..*\r\n$gdb_prompt $" {
set idx 0
}
}
if {$idx == 0} {
break
}
}
# Step 3, check the number of collections on each tracepoint.
for { set i $tpnum } { $i < [expr $tpnum + 2] } { incr i } {
if { $tracepoint_hits($i) == $iterations } {
pass "tracepoint $i hit $iterations times"
} elseif { $tracepoint_hits($i) > $iterations } {
# GDBserver deliver the signal while stepping over tracepoint,
# so it is possible that a tracepoint is collected twice.
pass "tracepoint $i hit $iterations times (spurious collection)"
} else {
fail "tracepoint $i hit $iterations times"
}
}
|
