1 # Copyright (C) 2014-2023 Free Software Foundation, Inc.
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.
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.
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/>.
16 # Test that GDB doesn't get confused in the following scenario
17 # (PR breakpoints/17000). Say, we have this program:
22 # The PC currently points at INSN1.
24 # 1 - User sets a breakpoint at 0xff000002 (INSN2).
26 # 2 - User steps. On software single-step archs, this sets a software
27 # single-step breakpoint at 0xff000002 (INSN2) too.
29 # 3 - User deletes breakpoint (INSN2) before the single-step finishes.
31 # 4 - The single-step finishes, and GDB removes the single-step
34 # Test relies on checking gdb debug output. Do not run if gdb debug is
35 # enabled as any debug will be redirected to the log.
36 if [gdb_debug_enabled] {
37 untested "debug is enabled"
43 if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
53 # With the all-stop RSP, we can't talk to the target while it's
54 # running, until we get back the stop reply. If not using single-step
55 # breakpoints, then the "del" in stepi_del_break below will try to
56 # delete the user breakpoint from the target, which will fail, with
57 # "Cannot execute this command while the target is running.". On
58 # software single-step targets, that del shouldn't trigger any RSP
59 # traffic. Hardware-step targets that can't access memory while the
60 # target is running, either remote or native, are likewise affected.
61 # So we just skip the test if not using software single-stepping. We
62 # detect that by looking for 'to_resume (..., step)' in "debug
65 # Probe for software single-step breakpoint use.
67 gdb_test_no_output "set debug target 1"
69 set test "probe target hardware step"
70 gdb_test_multiple "si" $test {
71 -re "resume \\(\[^\r\n\]+, step, .*$gdb_prompt $" {
80 if { $hardware_step } {
81 unsupported "target doesn't use software single-stepping"
85 gdb_test "set debug target 0" "->log_command.*\\)"
87 set line_re "\[^\r\n\]*"
89 gdb_test "b test:label" "Breakpoint .*"
90 gdb_continue_to_breakpoint "run past setup"
93 # So we can precisely control breakpoint insertion order.
94 gdb_test_no_output "set breakpoint always-inserted on"
96 # Capture disassembly output. PREFIX is used as test prefix. The
97 # current instruction indicator (=>) is stripped away.
98 proc disassemble { prefix } {
99 with_test_prefix "$prefix" {
100 set output [capture_command_output "disassemble test" ""]
101 return [string map {"=>" " "} $output]
105 # Issue a stepi and immediately delete the user breakpoint that is set
106 # at the same address as the software single-step breakpoint. Do this
107 # in a user defined command, so that the stepi's trap doesn't have a
108 # chance to be handled before further input is processed. We then
109 # compare before/after disassembly. GDB should be able to handle
110 # deleting the user breakpoint before deleting the single-step
111 # breakpoint. E.g., we shouldn't see breakpoint instructions in the
114 set disasm_before [disassemble "before"]
116 gdb_test "b test:label2" ".*" "set breakpoint where si will land"
118 set test "define stepi_del_break"
119 gdb_test_multiple $test $test {
120 -re "Type commands for definition of \"stepi_del_break\".\r\nEnd with a line saying just \"end\".\r\n>$" {
121 gdb_test "si&\ndel \$bpnum\nend" "" $test
125 set command "stepi_del_break"
127 gdb_test_multiple $command $test {
128 -re "^$command\r\n$gdb_prompt " {
129 # Note no end anchor, because "si&" finishes and prints the
130 # current frame/line after the prompt is printed.
135 # Now consume the output of the finished "si&".
136 set test "si& finished"
137 gdb_test_multiple "" $test {
138 -re "must be a single line \\\*/\r\n" {
143 set disasm_after [disassemble "after"]
145 set test "before/after disassembly matches"
146 if ![string compare $disasm_before $disasm_after] {