1# Copyright 2004-2021 Free Software Foundation, Inc.
2
3# This program is free software; you can redistribute it and/or modify
4# it under the terms of the GNU General Public License as published by
5# the Free Software Foundation; either version 3 of the License, or
6# (at your option) any later version.
7#
8# This program is distributed in the hope that it will be useful,
9# but WITHOUT ANY WARRANTY; without even the implied warranty of
10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11# GNU General Public License for more details.
12#
13# You should have received a copy of the GNU General Public License
14# along with this program.  If not, see <http://www.gnu.org/licenses/>.
15
16
17# The program siginfo.c creates a backtrace containing a signal
18# handler registered using sigaction's sa_sigaction / SA_SIGINFO.
19# Some OS's (e.g., GNU/Linux) use different signal trampolines for
20# sa_sigaction and sa_handler.
21
22# This test first confirms that GDB can backtrace through the
23# alternative sa_sigaction signal handler, and second that GDB can
24# nexti/stepi out of such a handler.
25
26if [target_info exists gdb,nosignals] {
27    verbose "Skipping siginfo.exp because of nosignals."
28    continue
29}
30
31
32standard_testfile
33
34if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
35    return -1
36}
37
38gdb_test "display/i \$pc"
39
40# Advance to main
41if ![runto_main] then {
42    fail "can't run to main"
43    return 0
44}
45
46# Pass all the alarms straight through (but verbosely)
47# gdb_test "handle SIGALRM print pass nostop"
48# gdb_test "handle SIGVTALRM print pass nostop"
49# gdb_test "handle SIGPROF print pass nostop"
50
51# Run to the signal handler, validate the backtrace.
52gdb_test "break handler"
53gdb_test "continue" ".* handler .*" "continue to stepi handler"
54gdb_test_sequence "bt" "backtrace for nexti" {
55    "\[\r\n\]+.0 \[^\r\n\]* handler "
56    "\[\r\n\]+.1  .signal handler called."
57    "\[\r\n\]+.2 \[^\r\n\]* main "
58}
59
60# Check that GDB can step the inferior back to main
61set test "step out of handler"
62gdb_test_multiple "step" "${test}" {
63    -re "Could not insert single-step breakpoint.*$gdb_prompt $" {
64	setup_kfail gdb/8841 sparc*-*-openbsd*
65	fail "$test (could not insert single-step breakpoint)"
66    }
67    -re "Cannot insert breakpoint.*Cannot access memory.*$gdb_prompt $" {
68        setup_kfail gdb/8841 "nios2*-*-linux*"
69	fail "$test (could not insert single-step breakpoint)"
70    }
71    -re "done = 1;.*${gdb_prompt} $" {
72	send_gdb "$i\n"
73	exp_continue
74    }
75    -re "\} .. handler .*${gdb_prompt} $" {
76	send_gdb "step\n"
77	exp_continue
78    }
79    -re "$inferior_exited_re normally.*${gdb_prompt} $" {
80	kfail gdb/1613 "$test (program exited)"
81    }
82    -re "(while ..done|return 0).*${gdb_prompt} $" {
83	# After stepping out of a function /r signal-handler, GDB will
84	# advance the inferior until it is at the first instruction of
85	# a code-line.  While typically things return to the middle of
86	# the "while..." (and hence GDB advances the inferior to the
87	# "return..." line) it is also possible for the return to land
88	# on the first instruction of "while...".  Accept both cases.
89	pass "$test"
90    }
91}
92