1# Copyright 2011-2019 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# x86 and amd64 gdbserver had a bug where a watchpoint triggered by 17# the DR3 debug register would trip on a bogus assertion. 18 19# This test relies on being able to set 4 hardware watchpoints. Since 20# that is not a valid assumption across most targets, and we're 21# testing a x86 specific bug, skip everywhere else. 22if { ![istarget "i?86-*-*"] && ![istarget "x86_64-*-*"] } then { 23 return 0 24} 25 26standard_testfile 27 28if [prepare_for_testing "failed to prepare" ${binfile} ${srcfile} {debug $additional_flags}] { 29 return -1 30} 31 32if ![runto_main] then { 33 untested "could not run to main" 34 return -1 35} 36 37gdb_test_no_output "set breakpoint always-inserted on" 38 39# Test that we handle watchpoints in all of DR0-DR3. 40 41gdb_test "watch i1" "Hardware watchpoint .*: i1" 42gdb_test "watch i2" "Hardware watchpoint .*: i2" 43gdb_test "watch i3" "Hardware watchpoint .*: i3" 44gdb_test "watch i4" "Hardware watchpoint .*: i4" 45 46gdb_test "c" "Hardware watchpoint.*: i1.*" "continue to i1 watchpoint" 47gdb_test "c" "Hardware watchpoint.*: i2.*" "continue to i2 watchpoint" 48gdb_test "c" "Hardware watchpoint.*: i3.*" "continue to i3 watchpoint" 49gdb_test "c" "Hardware watchpoint.*: i4.*" "continue to i4 watchpoint" 50 51delete_breakpoints 52 53# Regression test for a bug where the i386 watchpoints support backend 54# would leave some debug registers occupied even if not enough debug 55# registers were available to cover a single watchpoint location. 56 57gdb_test "watch i1" \ 58 "Hardware watchpoint .*: i1" \ 59 "set watchpoint occuping one debug register" 60 61# gap1 too long to fit the 3 left over debug registers (but would fit 62# 4 if all were available). 63set test "watchpoint on gap1 does not fit debug registers" 64gdb_test_multiple "watch gap1" "$test" { 65 -re "Hardware watchpoint .*: gap1.*Warning:.*Could not insert hardware watchpoint.*You may have requested too many.*\r\n$gdb_prompt $" { 66 pass $test 67 } 68 -re "Hardware watchpoint .*: gap1\r\n$gdb_prompt $" { 69 pass "$test (target emulates hardware watchpoints)" 70 return 71 } 72 -re "Watchpoint .*: gap1\r\n$gdb_prompt $" { 73 pass "$test (gdb figured out itself the watchpoint does not fit)" 74 return 75 } 76} 77 78# Start over. 79gdb_test "delete" \ 80 "" \ 81 "delete all watchpoints" \ 82 {Delete all breakpoints\? \(y or n\) $} \ 83 "y" 84 85# If debug registers were left occupied by mistake, we'll fail to set 86# some of these watchpoints. Each watchpoint should fit in one of the 87# 4 debug registers available. 88gdb_test "watch i1" "Hardware watchpoint .*: i1" "watch i1 still fits" 89gdb_test "watch i2" "Hardware watchpoint .*: i2" "watch i2 still fits" 90gdb_test "watch i3" "Hardware watchpoint .*: i3" "watch i3 still fits" 91gdb_test "watch i4" "Hardware watchpoint .*: i4" "watch i4 still fits" 92