1#   Copyright 2016-2020 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
16standard_testfile
17
18# Test a thread is doing step-over a syscall instruction which is exit,
19# and GDBserver should cleanup its state of step-over properly.
20
21set syscall_insn ""
22
23# Define the syscall instruction for each target.
24
25if { [istarget "i\[34567\]86-*-linux*"] || [istarget "x86_64-*-linux*"] } {
26    set syscall_insn "\[ \t\](int|syscall|sysenter)\[ \t\]"
27} elseif { [istarget "aarch64*-*-linux*"] || [istarget "arm*-*-linux*"] } {
28    set syscall_insn "\[ \t\](swi|svc)\[ \t\]"
29} else {
30    unsupported "unknown syscall instruction"
31    return -1
32}
33
34if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
35    return -1
36}
37
38# Start with a fresh gdb.
39clean_restart ${testfile}
40if ![runto_main] {
41    fail "can't run to main"
42    return -1
43}
44
45gdb_test "set follow-fork-mode child"
46gdb_test "set detach-on-fork off"
47
48# Step 1, find the syscall instruction address.
49
50gdb_test "break _exit" "Breakpoint $decimal at .*"
51
52# Hit the breakpoint on _exit.  The address of syscall insn is recorded.
53
54gdb_test "continue" \
55    "Continuing\\..*Breakpoint $decimal.*_exit \\(.*\\).*" \
56    "continue to exit"
57
58gdb_test "display/i \$pc" ".*"
59
60# Single step until we see a syscall insn or we reach the
61# upper bound of loop iterations.
62set msg "find syscall insn in exit"
63set steps 0
64set max_steps 1000
65gdb_test_multiple "stepi" $msg {
66    -re ".*$syscall_insn.*$gdb_prompt $" {
67	pass $msg
68    }
69    -re "x/i .*=>.*\r\n$gdb_prompt $" {
70	incr steps
71	if {$steps == $max_steps} {
72	    fail $msg
73	} else {
74	    send_gdb "stepi\n"
75	    exp_continue
76	}
77    }
78}
79
80if {$steps == $max_steps} {
81    return
82}
83
84# Remove the display
85gdb_test_no_output "delete display 1"
86
87set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"]
88
89gdb_test "continue" "exited normally.*" "continue to end, first time"
90gdb_test "inferior 1" ".*Switching to inferior 1.*" \
91    "switch back to inferior 1, first time"
92
93delete_breakpoints
94
95gdb_test "break marker"
96
97gdb_test "continue" "Continuing\\..*Breakpoint $decimal, .*" \
98    "continue to marker, first time"
99
100# Step 2, create a breakpoint which evaluates false, and force it
101# evaluated on the target side.
102
103set test "set breakpoint condition-evaluation target"
104gdb_test_multiple $test $test {
105    -re "warning: Target does not support breakpoint condition evaluation.\r\nUsing host evaluation mode instead.\r\n$gdb_prompt $" {
106	# Target doesn't support breakpoint condition evaluation
107	# on its side, but it is no harm to run the test.
108    }
109    -re "^$test\r\n$gdb_prompt $" {
110    }
111}
112
113gdb_test "break \*$syscall_insn_addr if main == 0" \
114    "Breakpoint \[0-9\]* at .*" \
115    "set conditional break at syscall address"
116
117# Resume the child process, and the step-over is being done.
118
119gdb_test "continue" "exited normally.*" "continue to end, second time"
120gdb_test "inferior 1" ".*Switching to inferior 1.*" \
121    "switch back to inferior 1, second time"
122
123# Switch back to the parent process, continue to the marker to
124# test GDBserver's state is still correct.
125
126gdb_test "continue" "Continuing\\..*Breakpoint $decimal, .*" \
127    "continue to marker, second time"
128