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

   1 # Copyright (C) 2014-2024 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 ${testfile}
  21
  22 # This test verifies that a watchpoint is detected in a multithreaded
  23 # program so the test is only meaningful on a system with hardware
  24 # watchpoints.
  25 require allow_hw_watchpoint_tests
  26
  27 if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
  28          executable [list debug "incdir=${objdir}"]] != "" } {
  29     return -1
  30 }
  31
  32 # The test proper.  DISPLACED is true if we should try with displaced
  33 # stepping.  WITH_BP is true if we should try with a thread-specific
  34 # breakpoint (for the wrong thread) right after the instruction that
  35 # triggers the watchpoint.
  36 proc do_test { displaced with_bp } {
  37     global executable
  38     global gdb_prompt
  39     global hex
  40
  41     if ${with_bp} {
  42         set prefix "with thread-specific bp"
  43     } else {
  44         set prefix "no thread-specific bp"
  45     }
  46     with_test_prefix "displaced=$displaced: $prefix" {
  47         # Cover both stepping and non-stepping execution commands.
  48         foreach command {"step" "next" "continue" } {
  49             with_test_prefix $command {
  50                 clean_restart $executable
  51
  52                 if ![runto_main] {
  53                     continue
  54                 }
  55
  56                 gdb_test_no_output "set displaced-stepping $displaced"
  57
  58                 set line [gdb_get_line_number "set wait-thread breakpoint here"]
  59                 if { ![gdb_breakpoint $line] } {
  60                     return
  61                 }
  62                 gdb_continue_to_breakpoint "run to wait-thread breakpoint"
  63                 gdb_test "info threads" "\\\* 1 .*  2 .*" "info threads shows all threads"
  64
  65                 gdb_test_no_output "set scheduler-locking on"
  66
  67                 delete_breakpoints
  68
  69                 gdb_breakpoint [gdb_get_line_number "set breakpoint child here"]
  70                 gdb_test "thread 2" "Switching to .*"
  71                 gdb_continue_to_breakpoint "run to breakpoint in thread 2"
  72
  73                 set address_triggers_watch "<invalid>"
  74                 set after_address_triggers_watch "<invalid>"
  75
  76                 # Let the watchpoint trigger once (with the other
  77                 # thread locked), in order to find both the address of
  78                 # the instruction that triggers the watchpoint and the
  79                 # address of the instruction immediately after.
  80                 with_test_prefix "find addresses" {
  81                     gdb_test "p watch_me = 0" " = 0" "clear watch_me"
  82                     gdb_test "watch watch_me" "Hardware watchpoint .*"
  83
  84                     gdb_test "continue" \
  85                         "Hardware watchpoint.*: watch_me.*New value = 1.*" \
  86                         "continue to watchpoint"
  87
  88                     set msg "find addresses"
  89                     gdb_test_multiple "disassemble" $msg {
  90                         -re " ($hex) \[^\r\n\]*\r\n=> ($hex) .*$gdb_prompt $" {
  91                             set address_triggers_watch $expect_out(1,string)
  92                             set after_address_triggers_watch $expect_out(2,string)
  93                             pass $msg
  94                         }
  95                     }
  96
  97                     delete_breakpoints
  98                 }
  99
 100                 gdb_test "break *$address_triggers_watch" "Breakpoint .*" \
 101                     "set breakpoint at address that triggers watch"
 102                 gdb_continue_to_breakpoint \
 103                     "run to instruction that triggers watch in thread 2"
 104
 105                 gdb_test "p counter = 0" " = 0" "unbreak loop in thread 2"
 106                 gdb_test "p watch_me = 0" " = 0" "clear watch_me"
 107                 gdb_test "watch watch_me" "Hardware watchpoint .*"
 108
 109                 if ${with_bp} {
 110                     gdb_test "b *$after_address_triggers_watch thread 1" \
 111                         "Breakpoint .*" \
 112                         "set breakpoint specific to thread 1"
 113                 }
 114
 115                 # Switch back to thread 1 and disable scheduler locking.
 116                 gdb_test "thread 1" "Switching to .*"
 117                 gdb_test_no_output "set scheduler-locking off"
 118
 119                 # Thread 2 is still stopped at a breakpoint that needs
 120                 # to be stepped over.  However, the instruction that
 121                 # is under the breakpoint triggers a watchpoint, which
 122                 # should trap and be reported to the user.
 123                 gdb_test "$command" "Hardware watchpoint.*: watch_me.*New value = 1.*"
 124             }
 125         }
 126     }
 127 }
 128
 129 foreach displaced { "off" "on" } {
 130     if { $displaced != "off" && ![support_displaced_stepping] } {
 131         continue
 132     }
 133
 134     foreach with_bp { 0 1 } {
 135         do_test $displaced $with_bp
 136     }
 137 }