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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
# Copyright 2011-2023 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/>.
load_lib "trace-support.exp"
require allow_shlib_tests
standard_testfile
set executable $testfile
set expfile $testfile.exp
# Some targets have leading underscores on assembly symbols.
set additional_flags [gdb_target_symbol_prefix_flags]
require gdb_trace_common_supports_arch
if [prepare_for_testing "failed to prepare" $executable $srcfile \
[list debug $additional_flags]] {
return -1
}
if ![runto_main] {
return -1
}
if ![gdb_target_supports_trace] {
unsupported "target does not support trace"
return -1
}
set libipa [get_in_proc_agent]
set remote_libipa [gdb_load_shlib $libipa]
# Can't use prepare_for_testing, because that splits compiling into
# building objects and then linking, and we'd fail with "linker input
# file unused because linking not done" when building the object.
if { [gdb_compile "$srcdir/$subdir/$srcfile" $binfile \
executable [list debug nopie $additional_flags shlib=$libipa] ] != "" } {
untested "failed to compile"
return -1
}
clean_restart ${executable}
if ![runto_main] {
return 0
}
proc run_trace_experiment {} {
gdb_test "continue" \
".*Breakpoint \[0-9\]+, begin .*" \
"advance to trace begin"
gdb_test_no_output "tstart" "start trace experiment"
# Fast tracepoint can be set in signal handler, so gdb_collect in
# IPA shouldn't call any non-async-signal-safe functions. It is
# impractical to list all non-async-signal-safe functions, and set
# breakpoints on them, so choose malloc only in this test.
gdb_test "b -q malloc"
# Performance-wise, gdb_collect in IPA shouldn't call any syscall
# in order to keep fast tracepoint fast enough.
global gdb_prompt
set test "catch syscall"
gdb_test_multiple $test $test {
-re "The feature \'catch syscall\' is not supported.*\r\n$gdb_prompt $" {
}
-re ".*$gdb_prompt $" {
pass $test
}
}
global decimal
set test "advance through tracing"
gdb_test_multiple "continue" $test {
-re "Thread 2 .* hit Catchpoint $decimal \\(call to syscall .*\\).*\r\n$gdb_prompt $" {
# IPA starts a helper thread, which calls accept. Ignore it.
send_gdb "continue\n"
exp_continue
}
-re "Breakpoint $decimal, end .*$gdb_prompt $" {
pass $test
}
}
gdb_test "tstatus" ".*Trace .*" "check on trace status"
gdb_test "tstop" "" ""
}
proc test_fast_tracepoints {} {
global gdb_prompt
set fourgood 0
gdb_breakpoint "begin" qualified
gdb_breakpoint "end" qualified
gdb_test "print gdb_agent_gdb_trampoline_buffer_error" ".*" ""
gdb_test "ftrace set_point" "Fast tracepoint .*" \
"fast tracepoint at a long insn"
gdb_trace_setactions "collect at set_point: define actions" \
"" \
"collect globvar, anarg" "^$"
# Make a test of shorter fast tracepoints, 32-bit x86 only
if { [istarget "i?86-*-*"] } {
# A Linux target needs to be able to allocate trampolines in the
# 16-bit range, check mmap_min_addr so we can warn testers.
if { [istarget "i?86-*-linux*"] } {
set minaddr [exec sh -c "cat /proc/sys/vm/mmap_min_addr"]
if { [expr $minaddr > 64512] } {
warning "mmap_min_addr > 64512, fast tracepoint will fail"
warning "do \"sudo sysctl -w vm.mmap_min_addr=32768\" to adjust"
}
}
gdb_test_multiple "ftrace four_byter" "set 4-byte fast tracepoint" {
-re "May not have a fast tracepoint at .*\r\n$gdb_prompt $" {
pass "4-byte fast tracepoint could not be set"
}
-re "Fast tracepoint .*\r\n$gdb_prompt $" {
pass "4-byte fast tracepoint is set"
set fourgood 1
}
}
if { $fourgood } {
gdb_trace_setactions "collect at four_byter: define actions" \
"" \
"collect globvar, anarg" "^$"
}
}
run_trace_experiment
gdb_test "tfind pc *set_point" "Found trace frame .*" \
"tfind set_point frame, first time"
gdb_test "print globvar" " = 1"
gdb_test "tfind pc *set_point" "Found trace frame .*" \
"tfind set_point frame, second time"
setup_kfail "gdb/13808" "x86_64-*-linux*"
gdb_test "print anarg" " = 200"
gdb_test "tfind start" "Found trace frame .*" \
"reset tfinding"
if { $fourgood } {
gdb_test "tfind pc *four_byter" "Found trace frame .*" \
"tfind four_byter frame, first time"
gdb_test "print anarg" " = 101" \
"look at collected local, first time"
gdb_test "tfind pc *four_byter" "Found trace frame .*" \
"tfind four_byter frame, second time"
gdb_test "print anarg" " = 201" \
"look at collected local, second time"
}
# If debugging with the remote target, try force disabling the
# fast tracepoints RSP feature, and confirm fast tracepoints
# can no longer be downloaded.
set test "fast tracepoint could not be downloaded with the feature disabled"
if [gdb_is_target_remote] {
gdb_test "set remote fast-tracepoints-packet off"
gdb_test_multiple "tstart" $test {
-re "warning: Target does not support fast tracepoints, downloading .* as regular tracepoint.*\r\n$gdb_prompt $" {
pass $test
}
}
} else {
unsupported $test
}
}
gdb_reinitialize_dir $srcdir/$subdir
if { [gdb_test "info sharedlibrary" ".*${remote_libipa}.*" "IPA loaded"] != 0 } {
untested "could not find IPA lib loaded"
return 1
}
test_fast_tracepoints
|
