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# Copyright (C) 2015-2021 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 <>.
# Test that GDB can step past a breakpoint even if GDB doesn't have
# symbols for the main binary. PR gdb/13858.
standard_testfile start.c
if { [build_executable "failed to build" ${testfile} $srcfile] } {
return -1
# Get the current PC. MSG is used as test message.
proc get_pc { msg } {
global hex gdb_prompt
set addr ""
gdb_test_multiple "p /x \$pc" "$msg" {
-re " = ($hex).*$gdb_prompt $" {
set addr $expect_out(1,string)
pass "$msg"
return $addr
# Test stepping past a breakpoint with no symbols. DISPLACED is one
# of the "set displaced-stepping" options. If GDB can't find where to
# put the scratch pad, GDB should be able to fall back to stepping
# past the breakpoint using an in-line step-over.
proc test_step_over { displaced } {
global hex
global binfile
clean_restart $binfile
if ![runto_main] {
return -1
set msg "purging symbols"
gdb_test_multiple "file" "$msg" {
-re "Are you sure you want to change the file.*y or n. $" {
send_gdb "y\n"
-re "Discard symbol table.*y or n. $" {
gdb_test "y" "No symbol file now." "$msg"
set before_addr [get_pc "get before PC"]
gdb_test "break *\$pc" "Breakpoint .* at $hex"
gdb_test_no_output "set displaced-stepping $displaced"
gdb_test "stepi" "$hex in \?\? .*"
set after_addr [get_pc "get after PC"]
gdb_assert {{[regexp "^${hex}$" $before_addr] \
&& [regexp "^${hex}$" $after_addr] \
&& $before_addr != $after_addr}} "advanced"
foreach displaced { "off" "on" "auto" } {
if { $displaced != "off" && ![support_displaced_stepping] } {
with_test_prefix "displaced=$displaced" {
test_step_over $displaced