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1 | # This testcase is part of GDB, the GNU debugger. | |
2 | ||
3 | # Copyright 2004-2020 Free Software Foundation, Inc. | |
4 | ||
5 | # This program is free software; you can redistribute it and/or modify | |
6 | # it under the terms of the GNU General Public License as published by | |
7 | # the Free Software Foundation; either version 3 of the License, or | |
8 | # (at your option) any later version. | |
9 | # | |
10 | # This program is distributed in the hope that it will be useful, | |
11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | # GNU General Public License for more details. | |
14 | # | |
15 | # You should have received a copy of the GNU General Public License | |
16 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | ||
18 | # Check that GDB can trigger and backtrace SIGSEGV signal stacks | |
19 | # caused by both accessing (data) and executing (code) at address | |
20 | # zero. | |
21 | ||
22 | # On function descriptor architectures, a zero descriptor, instead of | |
23 | # a NULL pointer, is used. That way the NULL code test always | |
24 | # contains a zero code reference. | |
25 | ||
26 | # For recovery, sigjmp/longjmp are used. | |
27 | ||
28 | # This also tests backtrace/gdb1476. | |
29 | ||
30 | if [target_info exists gdb,nosignals] { | |
31 | verbose "Skipping signull.exp because of nosignals." | |
32 | continue | |
33 | } | |
34 | ||
35 | ||
36 | standard_testfile .c | |
37 | ||
38 | if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } { | |
39 | untested "failed to compile" | |
40 | return -1 | |
41 | } | |
42 | ||
43 | clean_restart ${binfile} | |
44 | ||
45 | # | |
46 | # Run to `main' where we begin our tests. | |
47 | # | |
48 | ||
49 | if ![runto_main] then { | |
50 | fail "can't run to main" | |
51 | return 0 | |
52 | } | |
53 | ||
54 | # If we can examine what's at memory address 0, it is possible that we | |
55 | # could also execute it. This could probably make us run away, | |
56 | # executing random code, which could have all sorts of ill effects, | |
57 | # especially on targets without an MMU. Don't run the tests in that | |
58 | # case. | |
59 | ||
60 | if { [is_address_zero_readable] } { | |
61 | untested "memory at address 0 is possibly executable" | |
62 | return | |
63 | } | |
64 | ||
65 | # If an attempt to call a NULL pointer leaves the inferior in main, | |
66 | # then function pointers are descriptors, probe this and remember the | |
67 | # result. | |
68 | ||
69 | gdb_test_no_output "set test = code_entry_point" \ | |
70 | "set for function pointer probe" | |
71 | set test "probe function pointer" | |
72 | set function_pointer code_entry_point | |
73 | set signame "SIGSEGV" | |
74 | gdb_test_multiple "continue" "$test" { | |
75 | -re "Program received signal SIGSEGV.*bowler .*$gdb_prompt $" { | |
76 | set function_pointer code_descriptor | |
77 | pass "$test (function descriptor)" | |
78 | } | |
79 | -re "Program received signal SIGSEGV.*0.*$gdb_prompt $" { | |
80 | pass "$test (function entry-point)" | |
81 | } | |
82 | -re "Program received signal SIGBUS.*0.*$gdb_prompt $" { | |
83 | set signame SIGBUS | |
84 | pass "$test (function entry-point)" | |
85 | } | |
86 | } | |
87 | ||
88 | # Re-start from scratch, breakpoint the bowler so that control is | |
89 | # regained after each test, and run up to that. | |
90 | rerun_to_main | |
91 | gdb_test "break bowler" | |
92 | gdb_test "break keeper" | |
93 | # By default Stop:Yes Print:Yes Pass:Yes | |
94 | gdb_test "handle SIGSEGV" "SIGSEGV.*Yes.*Yes.*Yes.*Segmentation fault" | |
95 | gdb_test "handle SIGBUS" "SIGBUS.*Yes.*Yes.*Yes.*Bus error" | |
96 | ||
97 | # For the given signal type, check that: the SIGSEGV occures; a | |
98 | # backtrace from the SEGV works; the sigsegv is delivered; a backtrace | |
99 | # through the SEGV works. | |
100 | ||
101 | proc test_segv { name tag bt_from_segv bt_from_keeper } { | |
102 | global signame | |
103 | gdb_test continue "Breakpoint.* bowler.*" "${name}; start with the bowler" | |
104 | # NB: Don't use $tag in the testname - changes across systems. | |
105 | gdb_test_no_output "set test = $tag" "${name}; select the pointer type" | |
106 | gdb_test continue "Program received signal ${signame}.*" \ | |
107 | "${name}; take the ${signame}" | |
108 | gdb_test backtrace $bt_from_segv "${name}; backtrace from ${signame}" | |
109 | gdb_test continue "Breakpoint.* keeper.*" "${name}; continue to the keeper" | |
110 | gdb_test backtrace $bt_from_keeper "${name}; backtrace from keeper through ${signame}" | |
111 | } | |
112 | ||
113 | test_segv "data read" data_read \ | |
114 | {#0 .* bowler .*#1 .* main .*} \ | |
115 | {#0 .* keeper .*#1 .* handler .*#2 .* bowler .*#3 .* main .*} | |
116 | test_segv "data write" data_write \ | |
117 | {#0 .* bowler .*#1 .* main .*} \ | |
118 | {#0 .* keeper .*#1 .* handler .*#2 .* bowler .*#3 .* main .*} | |
119 | test_segv code $function_pointer \ | |
120 | {#0 .* 0x0+ .*#1 .* bowler .*#2 .* main .*} \ | |
121 | {#0 .* keeper .*#1 .* handler .*#2 .* 0x0+ .*#3 .* bowler .*#4 .* main .*} |