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
213
214
215
216
217
218
|
# Copyright 2008-2024 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/>.
#
# Test support for stepping over longjmp.
#
standard_testfile .c
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug nowarnings}] != "" } {
untested "failed to compile"
return -1
}
proc do_test { with_probes } {
clean_restart ${::binfile}
if { !$with_probes } {
gdb_test "maint ignore-probes libc ^longjmp$"
}
if {![runto_main]} {
return 0
}
# With a libc with probes, all tests should pass.
#
# Without probes, we can still set a break on longjmp, but getting the longjmp
# target may not work, in the following cases:
# - gdbarch_get_longjmp_target_p (gdbarch) == 0: not implemented.
# - gdbarch_get_longjmp_target (gdbarch) == 0: for instance on amd64 if
# tdep->jb_pc_offset == -1.
# - gdbarch_get_longjmp_target (gdbarch) != 0: if we have a glibc with
# pointer mangling ( https://sourceware.org/glibc/wiki/PointerEncryption )
# then we retrieve a mangled longjmp target that needs to be demangled.
# For instance on amd64 with target board unix/-m32.
#
# Pointer demangling is currently not implemented for any target.
# For the amd64 case, this would require copying for instance this:
# 48 c1 ca 11 ror $0x11,%rdx
# 64 48 33 14 25 30 00 xor %fs:0x30,%rdx
# into a scratch space, save the register set, set %rdx to the mangled
# longjmp target, displaced-step through the two insn and read the
# demangled longjmp target from %rdx, and restore the register set.
#
# The failure mode in the first two cases is that the next degrades into a
# continue. The failure mode in the latter case is a failure to set a
# breakpoint (matched by re_cannot_insert_bp) and a stop in longjmp.
#
# We detect the different failure modes and kfail these.
set have_longjmp_probe [have_longjmp_probe]
if { $with_probes } {
if { !$have_longjmp_probe } {
unsupported "longjmp probe required"
return
}
} else {
gdb_assert { !$have_longjmp_probe }
}
# When using these line numbers in break linespecs, prefix each of these
# with "$subdir/$srcfile:" to avoid referring to a glibc file when stopped
# in __libc_siglongjmp or similar.
set bp_miss_step_1 [gdb_get_line_number "miss_step_1"]
set bp_miss_step_2 [gdb_get_line_number "miss_step_2"]
set bp_start_test_1 [gdb_get_line_number "patt1"]
set bp_start_test_2 [gdb_get_line_number "patt2"]
set bp_start_test_3 [gdb_get_line_number "patt3"]
set re_cannot_insert_bp \
[multi_line \
"Warning:" \
"Cannot insert breakpoint $::decimal\\." \
"Cannot access memory at address $::hex"]
#
# Pattern 1 - simple longjmp.
#
with_test_prefix "pattern 1" {
with_test_prefix setup {
delete_breakpoints
gdb_test "break $::subdir/$::srcfile:$bp_start_test_1" \
"Breakpoint.*at.* file .*$::srcfile, line.*$bp_start_test_1.*" \
"breakpoint at pattern start"
gdb_test "continue" "patt1.*" "continue to breakpoint at pattern start"
# set safe-net break
gdb_test "break $::subdir/$::srcfile:$bp_miss_step_1" \
"Breakpoint.*at.* file .*$::srcfile, line.*$bp_miss_step_1.*" \
"breakpoint at safety net"
}
gdb_test "next" "longjmps\\+\\+;.*" "next over setjmp"
gdb_test "next" "longjmp \\(env, 1\\);.*" "next to longjmp"
set msg "next over longjmp"
gdb_test_multiple "next" $msg {
-re ".*patt1.*$::gdb_prompt $" {
pass $msg
gdb_test "next" "resumes\\+\\+.*" "next into else block"
gdb_test "next" "miss_step_1.*" "next into safety net"
}
-re "miss_step_1.*$::gdb_prompt $" {
if { $have_longjmp_probe } {
fail $gdb_test_name
} else {
kfail $gdb_test_name "gdb/26967"
}
}
-re -wrap "\r\n$re_cannot_insert_bp\r\n.*" {
if { $have_longjmp_probe } {
fail $gdb_test_name
} else {
kfail $gdb_test_name "gdb/26967"
}
}
}
}
#
# Pattern 2 - longjmp from an inner function.
#
with_test_prefix "pattern 2" {
with_test_prefix setup {
delete_breakpoints
gdb_test "break $::subdir/$::srcfile:$bp_start_test_2" \
"Breakpoint.*at.* file .*$::srcfile, line.*$bp_start_test_2.*" \
"breakpoint at pattern start"
gdb_test "continue" "patt2.*" "continue to breakpoint at pattern start"
# set safe-net break
gdb_test "break $::subdir/$::srcfile:$bp_miss_step_2" \
"Breakpoint.*at.* file .*$::srcfile, line.*$bp_miss_step_2.*" \
"breakpoint at safety net"
}
gdb_test "next" "call_longjmp.*" "next over setjmp"
set msg "next over call_longjmp"
gdb_test_multiple "next" $msg {
-re ".*patt2.*$::gdb_prompt $" {
pass $msg
gdb_test "next" "resumes\\+\\+.*" "next into else block"
gdb_test "next" "miss_step_2.*" "next into safety net"
}
-re "miss_step_2.*$::gdb_prompt $" {
if { $have_longjmp_probe } {
fail $gdb_test_name
} else {
kfail $gdb_test_name "gdb/26967"
}
}
-re -wrap "\r\n$re_cannot_insert_bp\r\n.*" {
if { $have_longjmp_probe } {
fail $gdb_test_name
} else {
kfail $gdb_test_name "gdb/26967"
}
}
}
}
#
# Pattern 3 - setjmp/longjmp inside stepped-over function.
#
with_test_prefix "pattern 3" {
with_test_prefix setup {
delete_breakpoints
gdb_test "break $::subdir/$::srcfile:$bp_start_test_3" \
"Breakpoint.*at.* file .*$::srcfile, line.*$bp_start_test_3.*" \
"breakpoint at pattern start"
gdb_test "continue" "patt3.*" "continue to breakpoint at pattern start"
}
gdb_test_multiple "next" "next over pattern" {
-re -wrap "longjmp caught.*" {
pass $gdb_test_name
}
-re -wrap "\r\n$re_cannot_insert_bp\r\n.*" {
if { $have_longjmp_probe } {
fail $gdb_test_name
} else {
kfail $gdb_test_name "gdb/26967"
}
}
}
}
}
foreach_with_prefix with_probes { 0 1 } {
do_test $with_probes
}
|
