gdb/testsuite/gdb.threads/step-over-trips-on-watchpoint.exp

   1 # Copyright (C) 2014-2022 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 when a step-over trips on a watchpoint, that watchpoint is
  17 # reported.
  18
  19 standard_testfile
  20 set executable ${testfile}
  21
  22 # This test verifies that a watchpoint is detected in a multithreaded
  23 # program so the test is only meaningful on a system with hardware
  24 # watchpoints.
  25 if {[skip_hw_watchpoint_tests]} {
  26     return 0
  27 }
  28
  29 if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
  30          executable [list debug "incdir=${objdir}"]] != "" } {
  31     return -1
  32 }
  33
  34 # The test proper.  DISPLACED is true if we should try with displaced
  35 # stepping.  WITH_BP is true if we should try with a thread-specific
  36 # breakpoint (for the wrong thread) right after the instruction that
  37 # triggers the watchpoint.
  38 proc do_test { displaced with_bp } {
  39     global executable
  40     global gdb_prompt
  41     global hex
  42
  43     if ${with_bp} {
  44         set prefix "with thread-specific bp"
  45     } else {
  46         set prefix "no thread-specific bp"
  47     }
  48     with_test_prefix "displaced=$displaced: $prefix" {
  49         # Cover both stepping and non-stepping execution commands.
  50         foreach command {"step" "next" "continue" } {
  51             with_test_prefix $command {
  52                 clean_restart $executable
  53
  54                 if ![runto_main] {
  55                     continue
  56                 }
  57
  58                 gdb_test_no_output "set displaced-stepping $displaced"
  59
  60                 set line [gdb_get_line_number "set wait-thread breakpoint here"]
  61                 if { ![gdb_breakpoint $line] } {
  62                     return
  63                 }
  64                 gdb_continue_to_breakpoint "run to wait-thread breakpoint"
  65                 gdb_test "info threads" "\\\* 1 .*  2 .*" "info threads shows all threads"
  66
  67                 gdb_test_no_output "set scheduler-locking on"
  68
  69                 delete_breakpoints
  70
  71                 gdb_breakpoint [gdb_get_line_number "set breakpoint child here"]
  72                 gdb_test "thread 2" "Switching to .*"
  73                 gdb_continue_to_breakpoint "run to breakpoint in thread 2"
  74
  75                 set address_triggers_watch "<invalid>"
  76                 set after_address_triggers_watch "<invalid>"
  77
  78                 # Let the watchpoint trigger once (with the other
  79                 # thread locked), in order to find both the address of
  80                 # the instruction that triggers the watchpoint and the
  81                 # address of the instruction immediately after.
  82                 with_test_prefix "find addresses" {
  83                     gdb_test "p watch_me = 0" " = 0" "clear watch_me"
  84                     gdb_test "watch watch_me" "Hardware watchpoint .*"
  85
  86                     gdb_test "continue" \
  87                         "Hardware watchpoint.*: watch_me.*New value = 1.*" \
  88                         "continue to watchpoint"
  89
  90                     set msg "find addresses"
  91                     gdb_test_multiple "disassemble" $msg {
  92                         -re " ($hex) \[^\r\n\]*\r\n=> ($hex) .*$gdb_prompt $" {
  93                             set address_triggers_watch $expect_out(1,string)
  94                             set after_address_triggers_watch $expect_out(2,string)
  95                             pass $msg
  96                         }
  97                     }
  98
  99                     delete_breakpoints
 100                 }
 101
 102                 gdb_test "break *$address_triggers_watch" "Breakpoint .*" \
 103                     "set breakpoint at address that triggers watch"
 104                 gdb_continue_to_breakpoint \
 105                     "run to instruction that triggers watch in thread 2"
 106
 107                 gdb_test "p counter = 0" " = 0" "unbreak loop in thread 2"
 108                 gdb_test "p watch_me = 0" " = 0" "clear watch_me"
 109                 gdb_test "watch watch_me" "Hardware watchpoint .*"
 110
 111                 if ${with_bp} {
 112                     gdb_test "b *$after_address_triggers_watch thread 1" \
 113                         "Breakpoint .*" \
 114                         "set breakpoint specific to thread 1"
 115                 }
 116
 117                 # Switch back to thread 1 and disable scheduler locking.
 118                 gdb_test "thread 1" "Switching to .*"
 119                 gdb_test_no_output "set scheduler-locking off"
 120
 121                 # Thread 2 is still stopped at a breakpoint that needs
 122                 # to be stepped over.  However, the instruction that
 123                 # is under the breakpoint triggers a watchpoint, which
 124                 # should trap and be reported to the user.
 125                 gdb_test "$command" "Hardware watchpoint.*: watch_me.*New value = 1.*"
 126             }
 127         }
 128     }
 129 }
 130
 131 foreach displaced { "off" "on" } {
 132     if { $displaced != "off" && ![support_displaced_stepping] } {
 133         continue
 134     }
 135
 136     foreach with_bp { 0 1 } {
 137         do_test $displaced $with_bp
 138     }
 139 }