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
|
# Copyright (C) 2014 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/>.
# In this test we're looking at how gdb handles backtraces and
# investigating the stack depth when confronted with an "invalid" stack,
# that is a stack where the first few frames are normal, and then there's a
# frame where the stack in unreadable.
#
# One interesting bug that has been observed is that gdb will sometime
# exhibit different behaviour the first time a stack command is run
# compared to the second (and later) times a command is run. This is
# because the first time a command is run gdb actually tries to figure out
# the answer, while the second (and later) times gdb relies on the answer
# cached from the first time. As a result in this test each command is
# run twice, and we restart gdb before testing each different command to
# ensure that nothing is being cached.
set opts {}
standard_testfile .S
if { ![istarget x86_64-*-* ] || ![is_lp64_target] } {
verbose "Skipping ${testfile}."
return
}
if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} $opts] } {
return -1
}
if ![runto breakpt] {
return -1
}
gdb_test "bt" "^bt\r\n#0 +breakpt *\\(\\) \[^\r\n\]*\r\n#1 +0x\[0-9a-f\]+ in func5\[^\r\n\]*\r\n#2 +0x\[0-9a-f\]+ in func4\[^\r\n\]*\r\n#3 +0x\[0-9a-f\]+ in func3\[^\r\n\]*\r\nCannot access memory at address 0x\[0-9a-f\]+" \
"first backtrace, with error message"
send_gdb "bt\n"
gdb_expect {
-re "^bt\r\n#0 +breakpt *\\(\\) \[^\r\n\]*\r\n#1 +0x\[0-9a-f\]+ in func5\[^\r\n\]*\r\n#2 +0x\[0-9a-f\]+ in func4\[^\r\n\]*\r\n#3 +0x\[0-9a-f\]+ in func3\[^\r\n\]*\r\nCannot access memory at address 0x\[0-9a-f\]+\r\n$gdb_prompt $" {
# Currently gdb will not display the error message associated with
# the truncated backtrace after the first backtrace has been
# completed. Ideally, we would do this. If this case is ever hit
# then we have started to display the backtrace in all cases and
# the xpass should becomd a pass, and the previous pass case below
# should be removed, or changed to a fail.
xpass "second backtrace, with error message"
}
-re "^bt\r\n#0 +breakpt *\\(\\) \[^\r\n\]*\r\n#1 +0x\[0-9a-f\]+ in func5\[^\r\n\]*\r\n#2 +0x\[0-9a-f\]+ in func4\[^\r\n\]*\r\n#3 +0x\[0-9a-f\]+ in func3\[^\r\n\]*\r\n$gdb_prompt $" {
pass "second backtrace, without error message"
}
timeout {
fail "second backtrace (timeout)"
}
}
clean_restart ${binfile}
if ![runto breakpt] {
return -1
}
set test_name "check mi -stack-info-depth command, first time"
send_gdb "interpreter-exec mi \"-stack-info-depth\"\n"
gdb_expect {
-re "\\^done,depth=\"4\"\r\n$gdb_prompt $" {
pass $test_name
}
-re "\\^error,msg=\"Cannot access memory at address $hex\"\r\n$gdb_prompt $" {
xfail $test_name
}
}
gdb_test "interpreter-exec mi \"-stack-info-depth\"" \
"\\^done,depth=\"4\"" \
"check mi -stack-info-depth command, second time"
clean_restart ${binfile}
if ![runto breakpt] {
return -1
}
set test_name "check mi -stack-list-frames command, first time"
send_gdb "interpreter-exec mi \"-stack-list-frames\"\n"
gdb_expect {
-re "\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"breakpt\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"\},frame=\{level=\"1\",addr=\"$hex\",func=\"func5\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"\},frame=\{level=\"2\",addr=\"$hex\",func=\"func4\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"\},frame=\{level=\"3\",addr=\"$hex\",func=\"func3\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"\}\\\]\r\n$gdb_prompt $" {
pass $test_name
}
-re "\\^error,msg=\"Cannot access memory at address $hex\"\r\n$gdb_prompt $" {
xfail $test_name
}
}
gdb_test "interpreter-exec mi \"-stack-list-frames\"" \
"\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"breakpt\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"\},frame=\{level=\"1\",addr=\"$hex\",func=\"func5\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"\},frame=\{level=\"2\",addr=\"$hex\",func=\"func4\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"\},frame=\{level=\"3\",addr=\"$hex\",func=\"func3\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"\}\\\]" \
"check mi -stack-list-frames command, second time"
|
