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# Copyright 2018-2021 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
# 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 <>.
# This testcase is a regression test for a regression in the in-line
# step-over machinery. If a resumption that starts a step-over
# failed, a following resumption would make GDB hang forever:
# (gdb) b *0
# Breakpoint 2 at 0x0
# continue
# Continuing.
# Warning:
# Cannot insert breakpoint 2.
# Cannot access memory at address 0x0
# Command aborted.
# delete breakpoints
# Delete all breakpoints? (y or n) y
# (gdb) b function
# Breakpoint 3 at 0x40048b: file test.c, line 33.
# continue
# Continuing.
# *GDB hangs forever*
if {[build_executable "failed to prepare" $testfile $srcfile debug]} {
return -1
# DISPLACED indicates whether to use displaced-stepping.
proc do_test {displaced breakpoint_always_inserted} {
global gdb_prompt decimal
global srcfile binfile
clean_restart $binfile
gdb_test_no_output "set displaced-stepping $displaced"
gdb_test_no_output "set breakpoint always-inserted $breakpoint_always_inserted"
if ![runto_main] {
return -1
# We rely on not being able to set a breakpoint at 0, as proxy for
# any kind of breakpoint insertion failure. If we can examine
# what's at memory address 0, it is possible that we could also
# execute it.
if [is_address_zero_readable] {
untested "memory at address 0 is possibly executable"
# Set a breakpoint that fails to insert.
if { $breakpoint_always_inserted == "on" } {
gdb_test "b *0" "Breakpoint $decimal at 0x0.*"
} else {
gdb_test "b *0" "Breakpoint $decimal at 0x0"
gdb_test "continue" \
"Command aborted\\." \
"continue aborts"
# Delete the "bad" breakpoint and try continuing again.
gdb_test "b function" "Breakpoint $decimal .*$srcfile.*"
gdb_test "continue" \
"Breakpoint $decimal, function \\(\\) at .*$srcfile:.*" \
"continue to function"
# This testcase exercises a regression with the in-line step-over
# machinery. So make sure this runs with displaced stepping disabled,
# and for good measure, also try with displaced stepping enabled.
foreach_with_prefix displaced-stepping {"off" "on"} {
foreach_with_prefix breakpoint-always-inserted {"off" "on"} {
do_test ${displaced-stepping} ${breakpoint-always-inserted}