144 lines
4.5 KiB
Text
144 lines
4.5 KiB
Text
# Copyright (C) 2014-2016 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test that GDB doesn't get confused in the following scenario
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# (PR breakpoints/17000). Say, we have this program:
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#
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# => 0xff000001 INSN1
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# 0xff000002 INSN2
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#
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# The PC currently points at INSN1.
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#
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# 1 - User sets a breakpoint at 0xff000002 (INSN2).
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#
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# 2 - User steps. On software single-step archs, this sets a software
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# single-step breakpoint at 0xff000002 (INSN2) too.
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#
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# 3 - User deletes breakpoint (INSN2) before the single-step finishes.
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#
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# 4 - The single-step finishes, and GDB removes the single-step
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# breakpoint.
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standard_testfile
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if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
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return -1
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}
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if ![runto_main] {
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fail "Can't run to main"
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return 0
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}
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delete_breakpoints
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# With the all-stop RSP, we can't talk to the target while it's
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# running, until we get back the stop reply. If not using single-step
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# breakpoints, then the "del" in stepi_del_break below will try to
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# delete the user breakpoint from the target, which will fail, with
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# "Cannot execute this command while the target is running.". On
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# software single-step targets, that del shouldn't trigger any RSP
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# traffic. Hardware-step targets that can't access memory while the
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# target is running, either remote or native, are likewise affected.
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# So we just skip the test if not using software single-stepping. We
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# detect that by looking for 'to_resume (..., step)' in "debug
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# target" output.
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# Probe for software single-step breakpoint use.
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gdb_test_no_output "set debug target 1"
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set hardware_step 0
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set test "probe target hardware step"
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gdb_test_multiple "si" $test {
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-re "to_resume \\(\[^\r\n\]+, step, .*$gdb_prompt $" {
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set hardware_step 1
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pass $test
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}
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-re "$gdb_prompt $" {
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pass $test
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}
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}
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if { $hardware_step } {
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unsupported "target doesn't use software single-stepping"
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return
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}
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gdb_test "set debug target 0" "->to_log_command.*\\)"
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set line_re "\[^\r\n\]*"
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gdb_test "b test:label" "Breakpoint .*"
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gdb_continue_to_breakpoint "run past setup"
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delete_breakpoints
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# So we can precisely control breakpoint insertion order.
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gdb_test_no_output "set breakpoint always-inserted on"
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# Capture disassembly output. PREFIX is used as test prefix. The
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# current instruction indicator (=>) is stripped away.
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proc disassemble { prefix } {
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with_test_prefix "$prefix" {
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set output [capture_command_output "disassemble test" ""]
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return [string map {"=>" " "} $output]
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}
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}
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# Issue a stepi and immediately delete the user breakpoint that is set
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# at the same address as the software single-step breakpoint. Do this
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# in a user defined command, so that the stepi's trap doesn't have a
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# chance to be handled before further input is processed. We then
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# compare before/after disassembly. GDB should be able to handle
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# deleting the user breakpoint before deleting the single-step
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# breakpoint. E.g., we shouldn't see breakpoint instructions in the
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# disassembly.
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set disasm_before [disassemble "before"]
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gdb_test "b test:label2" ".*" "set breakpoint where si will land"
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set test "define stepi_del_break"
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gdb_test_multiple $test $test {
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-re "Type commands for definition of \"stepi_del_break\".\r\nEnd with a line saying just \"end\".\r\n>$" {
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gdb_test "si&\ndel \$bpnum\nend" "" $test
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}
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}
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set command "stepi_del_break"
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set test $command
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gdb_test_multiple $command $test {
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-re "^$command\r\n$gdb_prompt " {
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# Note no end anchor, because "si&" finishes and prints the
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# current frame/line after the prompt is printed.
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pass $test
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}
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}
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# Now consume the output of the finished "si&".
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set test "si& finished"
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gdb_test_multiple "" $test {
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-re "must be a single line \\\*/\r\n" {
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pass $test
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}
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}
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set disasm_after [disassemble "after"]
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set test "before/after disassembly matches"
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if ![string compare $disasm_before $disasm_after] {
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pass $test
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} else {
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fail $test
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}
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