1# Copyright (C) 2014-2015 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 16# Test that GDB doesn't get confused in the following scenario 17# (PR breakpoints/17000). Say, we have this program: 18# 19# => 0xff000001 INSN1 20# 0xff000002 INSN2 21# 22# The PC currently points at INSN1. 23# 24# 1 - User sets a breakpoint at 0xff000002 (INSN2). 25# 26# 2 - User steps. On software single-step archs, this sets a software 27# single-step breakpoint at 0xff000002 (INSN2) too. 28# 29# 3 - User deletes breakpoint (INSN2) before the single-step finishes. 30# 31# 4 - The single-step finishes, and GDB removes the single-step 32# breakpoint. 33 34standard_testfile 35 36if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} { 37 return -1 38} 39 40if ![runto_main] { 41 fail "Can't run to main" 42 return 0 43} 44 45delete_breakpoints 46 47# With the all-stop RSP, we can't talk to the target while it's 48# running, until we get back the stop reply. If not using single-step 49# breakpoints, then the "del" in stepi_del_break below will try to 50# delete the user breakpoint from the target, which will fail, with 51# "Cannot execute this command while the target is running.". On 52# software single-step targets, that del shouldn't trigger any RSP 53# traffic. Hardware-step targets that can't access memory while the 54# target is running, either remote or native, are likewise affected. 55# So we just skip the test if not using software single-stepping. We 56# detect that by looking for 'to_resume (..., step)' in "debug 57# target" output. 58 59# Probe for software single-step breakpoint use. 60 61gdb_test_no_output "set debug target 1" 62set hardware_step 0 63set test "probe target hardware step" 64gdb_test_multiple "si" $test { 65 -re "to_resume \\(\[^\r\n\]+, step, .*$gdb_prompt $" { 66 set hardware_step 1 67 pass $test 68 } 69 -re "$gdb_prompt $" { 70 pass $test 71 } 72} 73 74if { $hardware_step } { 75 unsupported "target doesn't use software single-stepping" 76 return 77} 78 79gdb_test "set debug target 0" "->to_log_command.*\\)" 80 81set line_re "\[^\r\n\]*" 82 83gdb_test "b test:label" "Breakpoint .*" 84gdb_continue_to_breakpoint "run past setup" 85delete_breakpoints 86 87# So we can precisely control breakpoint insertion order. 88gdb_test_no_output "set breakpoint always-inserted on" 89 90# Capture disassembly output. PREFIX is used as test prefix. The 91# current instruction indicator (=>) is stripped away. 92proc disassemble { prefix } { 93 with_test_prefix "$prefix" { 94 set output [capture_command_output "disassemble test" ""] 95 return [string map {"=>" " "} $output] 96 } 97} 98 99# Issue a stepi and immediately delete the user breakpoint that is set 100# at the same address as the software single-step breakpoint. Do this 101# in a user defined command, so that the stepi's trap doesn't have a 102# chance to be handled before further input is processed. We then 103# compare before/after disassembly. GDB should be able to handle 104# deleting the user breakpoint before deleting the single-step 105# breakpoint. E.g., we shouldn't see breakpoint instructions in the 106# disassembly. 107 108set disasm_before [disassemble "before"] 109 110gdb_test "b test:label2" ".*" "set breakpoint where si will land" 111 112set test "define stepi_del_break" 113gdb_test_multiple $test $test { 114 -re "Type commands for definition of \"stepi_del_break\".\r\nEnd with a line saying just \"end\".\r\n>$" { 115 gdb_test "si&\ndel \$bpnum\nend" "" $test 116 } 117} 118 119set command "stepi_del_break" 120set test $command 121gdb_test_multiple $command $test { 122 -re "^$command\r\n$gdb_prompt " { 123 # Note no end anchor, because "si&" finishes and prints the 124 # current frame/line after the prompt is printed. 125 pass $test 126 } 127} 128 129# Now consume the output of the finished "si&". 130set test "si& finished" 131gdb_test_multiple "" $test { 132 -re "must be a single line \\\*/\r\n" { 133 pass $test 134 } 135} 136 137set disasm_after [disassemble "after"] 138 139set test "before/after disassembly matches" 140if ![string compare $disasm_before $disasm_after] { 141 pass $test 142} else { 143 fail $test 144} 145