# Copyright (C) 1992 Free Software Foundation, Inc. # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ # Please email any bugs, comments, and/or additions to this file to: # bug-gdb@prep.ai.mit.edu # This file was written by Fred Fish. (fnf@cygnus.com) if $tracelevel then { strace $tracelevel } set prms_id 0 set bug_id 0 set binfile "watchpoint" set srcfile $binfile.c if ![file exists $objdir/$subdir/$binfile] then { perror "$objdir/$subdir/$binfile does not exist." return 0 } # Prepare for watchpoint tests by setting up two breakpoints and one # watchpoint. # # We use breakpoints at marker functions to get past all the startup code, # so we can get to the watchpoints in a reasonable amount of time from a # known starting point. # # For simplicity, so we always know how to reference specific breakpoints or # watchpoints by number, we expect a particular ordering and numbering of # each in the combined breakpoint/watchpoint table, as follows: # # Number What Where # 1 Breakpoint marker1() # 2 Breakpoint marker2() # 3 Watchpoint ival3 proc initialize {} { global prompt global hex global decimal global srcfile send "break marker1\n" expect { -re "Breakpoint 1 at $hex: file .*$srcfile, line $decimal.*$prompt $" {} -re ".*$prompt $" { fail "set breakpoint at marker1" ; return 0 } timeout { fail "set breakpoint at marker1 (timeout)" ; return 0 } } send "break marker2\n" expect { -re "Breakpoint 2 at $hex: file .*$srcfile, line $decimal.*$prompt $" {} -re ".*$prompt $" { fail "set breakpoint at marker2" ; return 0 } timeout { fail "set breakpoint at marker2 (timeout)" ; return 0 } } send "info break\n" expect { -re "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n$prompt $" { } -re ".*$prompt $" { fail "breakpoints not setup right" ; return 0 } timeout { fail "info break (timeout)" ; return 0 } } send "watch ival3\n" expect { -re ".*\[Ww\]atchpoint 3: ival3\r\n$prompt $" { pass "set watchpoint" } -re ".*$prompt $" { fail "set watchpoint on ival3" ; return 0 } timeout { fail "set watchpoint on ival3 (timeout)" ; return 0 } } # "info watch" is the same as "info break" send "info watch\n" expect { -re "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n3\[ \]*.*watchpoint.*ival3\r\n$prompt $" { pass "watchpoint found in watchpoint/breakpoint table" } -re ".*$prompt $" { fail "watchpoint/breakpoint not set" ; return 0 } timeout { fail "info break (timeout)" ; return 0 } } # After installing the watchpoint, we disable it until we are ready # to use it. This allows the test program to run at full speed until # we get to the first marker function. send "disable 3\n" expect { -re "disable 3\r\n$prompt $" { pass "watchpoint disabled" } -re ".*$prompt $" { fail "watchpoint not disabled" ; return 0 } timeout { fail "watchpoint not disabled (timeout)" ; return 0 } } return 1 } # # Test simple watchpoint. # proc test_simple_watchpoint {} { global prompt global hex global decimal # Ensure that the watchpoint is disabled when we startup. send "disable 3\n" expect { -re "disable 3\r\n$prompt $" { } -re ".*$prompt $" { fail "watchpoint not disabled" ; return 0 } timeout { fail "watchpoint not disabled (timeout)" ; return 0 } } # Run until we get to the first marker function. send "run\n" expect { -re "The program .* has been started already.* \(y or n\) $" { send "y\n" exp_continue } -re "Starting program.*Breakpoint 1, marker1 .*$prompt $" {} -re ".*$prompt $" { fail "run until marker1 function hit" ; return } timeout { fail "run until marker1 function hit (timeout)" ; return } } # After reaching the marker function, enable the watchpoint. send "enable 3\n" expect { -re "enable 3\r\n$prompt $" { pass "watchpoint enabled" } -re ".*$prompt $" { fail "watchpoint not enabled" ; return } timeout { fail "watchpoint not enabled (timeout)" ; return } } gdb_test "break func1" "Breakpoint.*at" gdb_test "set \\\$func1_breakpoint_number = \\\$bpnum" "" gdb_test "continue" "Continuing.*Breakpoint \[0-9\]*, func1" \ "continue to breakpoint at func1" # Continue until the first change, from -1 to 0 send "cont\n" expect { -re "Continuing.*Watchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*$prompt $" { pass "watchpoint hit, first time" } -re "Continuing.*Watchpoint.*ival3.*Old value = -1.*New value = 0.*for .count = 0; count < 4; count\[+)\]+ \{.*$prompt $" { # setup_xfail "m68*-*-sunos*" 1836 fail "missed first watchpoint" return } -re "Continuing.*Breakpoint.*func1.*$prompt $" { setup_xfail "m68*-*-*" 2597 fail "thought it hit breakpoint at func1 twice" gdb_test "delete \\\$func1_breakpoint_number" "" gdb_test "continue" "\ Continuing.*Watchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count;" \ "watchpoint hit, first time" } -re ".*$prompt $" { fail "missed first watchpoint" ; return } timeout { fail "run to first watchpoint (timeout)" ; return } eof { fail "run to first watchpoint (eof)" ; return } } gdb_test "delete \\\$func1_breakpoint_number" "" # Continue until the next change, from 0 to 1. send "cont\n" expect { -re "Continuing.*Watchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*$prompt $" { pass "watchpoint hit, second time" } -re ".*$prompt $" { fail "missed second watchpoint" ; return } timeout { fail "run to second watchpoint (timeout)" ; return } } # Continue until the next change, from 1 to 2. send "cont\n" expect { -re "Continuing.*Watchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*$prompt $" { pass "watchpoint hit, third time" } -re ".*$prompt $" { fail "missed third watchpoint" ; return } timeout { fail "run to third watchpoint (timeout)" ; return } } # Continue until the next change, from 2 to 3. send "cont\n" expect { -re "Continuing.*Watchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*$prompt $" { pass "watchpoint hit, fourth time" } -re ".*$prompt $" { fail "missed fourth watchpoint" ; return } timeout { fail "run to fourth watchpoint (timeout)" ; return } } # Continue until the next change, from 3 to 4. # Note that this one is outside the loop. send "cont\n" expect { -re "Continuing.*Watchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*$prompt $" { pass "watchpoint hit, fifth time" } -re ".*$prompt $" { fail "missed fifth watchpoint" ; return } timeout { fail "run to fifth watchpoint (timeout)" ; return } } # Continue until we hit the finishing marker function. # Make sure we hit no more watchpoints. # This used to fail for a29k-amd-udi (PR 2421), but has been fixed. send "cont\n" expect { -re "Continuing.*Breakpoint.*marker2 \(\).*$prompt $" { } -re "Continuing.*Watchpoint.*ival3.*$prompt $" { fail "hit a disabled watchpoint" ; return } -re ".*$prompt $" { fail "marker2 function missed" ; return } timeout { fail "run to marker2 function (timeout)" ; return } } # Disable the watchpoint so we run at full speed until we exit. send "disable 3\n" expect { -re "disable 3\r\n$prompt $" { pass "watchpoint disabled" } -re ".*$prompt $" { fail "watchpoint not disabled" ; return } timeout { fail "watchpoint not disabled (timeout)" ; return } } # Run until process exits. send "cont\n" expect { -re "Continuing.*Program exited normally.*$prompt $" { } -re ".*$prompt $" { fail "watchpoints not removed" ; return } timeout { fail "looking for process exit (timeout)" } } } # Test disabling watchpoints. proc test_disabling_watchpoints {} { global prompt global binfile global srcfile global decimal global hex # Ensure that the watchpoint is disabled when we startup. send "disable 3\n" expect { -re "disable 3\r\n$prompt $" { } -re ".*$prompt $" { fail "watchpoint not disabled" ; return 0 } timeout { fail "watchpoint not disabled (timeout)" ; return 0 } } # Run until we get to the first marker function. send "run\n" expect { -re "The program .* has been started already.* \(y or n\) $" { send "y\n" exp_continue } -re "Starting program.*Breakpoint 1, marker1 .*$prompt $" {} -re ".*$prompt $" { fail "run until marker1 function hit" ; return } timeout { fail "run until marker1 function hit (timeout)" ; return } } # After reaching the marker function, enable the watchpoint. send "enable 3\n" expect { -re "enable 3\r\n$prompt $" { pass "watchpoint enabled" } -re ".*$prompt $" { fail "watchpoint not enabled" ; return } timeout { fail "watchpoint not enabled (timeout)" ; return } } # Continue until the first change, from -1 to 0 # Don't check the old value, because on VxWorks the variable value # will not have been reinitialized. send "cont\n" expect { -re "Continuing.*Watchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*$prompt $" { pass "watchpoint hit, first time" } -re "Continuing.*Watchpoint.*ival3.*Old value = .*New value = 0.*for .count = 0; count < 4; count\[+)]+ \{.*$prompt $" { # setup_xfail "m68*-*-sunos*" 1836 fail "missed first watchpoint" return } -re ".*$prompt $" { fail "missed first watchpoint" ; return } timeout { fail "run to first watchpoint (timeout)" ; return } } # Continue until the next change, from 0 to 1. send "cont\n" expect { -re "Continuing.*Watchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*$prompt $" { pass "watchpoint hit, second time" } -re ".*$prompt $" { fail "missed second watchpoint" ; return } timeout { fail "run to second watchpoint (timeout)" ; return } } # Disable the watchpoint but leave breakpoints send "disable 3\n" expect { -re "disable 3\r\n$prompt $" { } -re ".*$prompt $" { fail "watchpoint not disabled" ; return 0 } timeout { fail "watchpoint not disabled (timeout)" ; return 0 } } # Check watchpoint list, looking for the entry that confirms the # watchpoint is disabled. send "info watchpoints\n" expect { -re "3\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*$prompt $" { pass "watchpoint disabled in table" } -re ".*$prompt $" { fail "disabled watchpoint not found in table" } timeout { fail "info watchpoints (timeout)" } } # Continue until we hit the finishing marker function. # Make sure we hit no more watchpoints. send "cont\n" expect { -re "Continuing.*Breakpoint.*marker2 \[)(\]+.*$prompt $" { pass "disabled watchpoint skipped" } -re "Continuing.*Watchpoint.*ival3.*$prompt $" { fail "hit a disabled watchpoint" ; return } -re ".*$prompt $" { fail "marker2 function missed" ; return } timeout { fail "run to marker2 function (timeout)" ; return } } send "cont\n" expect { -re "Continuing.*Program exited normally.*$prompt $" { } -re ".*$prompt $" { fail "watchpoints not removed" ; return } timeout { fail "looking for process exit (timeout)" } } } # Test stepping and other mundane operations with watchpoints enabled proc test_stepping {} { global prompt if [runto marker1] then { gdb_test "watch ival2" ".*\[Ww\]atchpoint \[0-9\]*: ival2" # Well, let's not be too mundane. It should be a *bit* of a challenge gdb_test "break func2 if 0" "Breakpoint.*at" gdb_test "p \\\$func2_breakpoint_number = \\\$bpnum" "=" # The HPPA has a problem here. if [ istarget "hppa*-*-*" ] then { # Don't actually try doing the call, if we do we can't continue. setup_xfail "*-*-*" fail "calling function with watchpoint enabled" } else { # The problem is that GDB confuses stepping through the call # dummy with hitting the breakpoint at the end of the call dummy. # Will be fixed once all architectures define # CALL_DUMMY_BREAKPOINT_OFFSET. setup_xfail "*-*-*" # This doesn't occur if the call dummy starts with a call, # because we are out of the dummy by the first time the inferior # stops. clear_xfail "m68*-*-*" clear_xfail "i*86*-*-*" clear_xfail "vax-*-*" # The following architectures define CALL_DUMMY_BREAKPOINT_OFFSET. clear_xfail "alpha-*-*" clear_xfail "mips*-*-*" clear_xfail "sparc-*-*" gdb_test "p func1 ()" "= 73" \ "calling function with watchpoint enabled" } # # "finish" brings us back to main. # On some targets (e.g. alpha) gdb will stop from the finish in midline # of the marker1 call. This is due to register restoring code on # the alpha and might be caused by stack adjustment instructions # on other targets. In this case we will step once more. # send "finish\n" expect { -re "Run.*exit from.*marker1.*main.* at" { } default { fail "finish from marker1" ; return } } expect { -re "marker1 \[)(\]+;.*$prompt $" { send "step\n" exp_continue } -re "func1 \[)(\]+;.*$prompt $" { pass "finish from marker1" } -re ".*$prompt $" { fail "finish from marker1" } default { fail "finish from marker1" ; return } } gdb_test "next" "for \[(\]+count = 0" # Now test that "until" works. It's a bit tricky to test # "until", because compilers don't always arrange the code # exactly the same way, and we might get slightly different # sequences of statements. But the following should be true # (if not it is a compiler or a debugger bug): The user who # does "until" at every statement of a loop should end up # stepping through the loop once, and the debugger should not # stop for any of the remaining iterations. gdb_test "until" "ival1 = count" gdb_test "until" "ival3 = count" send "until\n" expect { -re "(for \[(\]+count = 0|\}).*$prompt $" { gdb_test "until" "ival1 = count; /. Outside loop ./" } -re "ival1 = count; /. Outside loop ./.*$prompt $" { pass "until out of loop" } -re ".*$prompt $" { fail "until out of loop" } default { fail "until out of loop" ; return } } gdb_test "step" "ival2 = count" } } # Test stepping and other mundane operations with watchpoints enabled proc test_watchpoint_triggered_in_syscall {} { global prompt global timeout set saved_timeout $timeout # Run until we get to the first marker function. set x 0 set y 0 set testname "Watch buffer passed to read syscall" if [runto marker2] then { gdb_test "watch buf\\\[0\\\]" ".*\[Ww\]atchpoint \[0-9\]*: buf" gdb_test "watch buf\\\[1\\\]" ".*\[Ww\]atchpoint \[0-9\]*: buf" gdb_test "watch buf\\\[2\\\]" ".*\[Ww\]atchpoint \[0-9\]*: buf" gdb_test "watch buf\\\[3\\\]" ".*\[Ww\]atchpoint \[0-9\]*: buf" gdb_test "watch buf\\\[4\\\]" ".*\[Ww\]atchpoint \[0-9\]*: buf" gdb_test "break marker4" ".*Breakpoint.*" send "set doread = 1\n" expect { -re ".*$prompt $" { } timeout { fail "set doread" ; return } } # Sometimes our string never gets to GDB?!? dejagnu bug? Whatever # the cause we'll set a reasonably short timeout and resend our # string again if we timeout. set timeout 10 send "continue\n" send "123\n" expect { -re ".*Watchpoint.*buf\\\[0\\\].*Old value = 0.*New value = 49\[^\n\]*\n" { set x [expr $x+1] ; exp_continue } -re ".*Watchpoint.*buf\\\[1\\\].*Old value = 0.*New value = 50\[^\n\]*\n" { set x [expr $x+1] ; exp_continue } -re ".*Watchpoint.*buf\\\[2\\\].*Old value = 0.*New value = 51\[^\n\]*\n" { set x [expr $x+1] ; exp_continue } -re ".*Watchpoint.*buf\\\[3\\\].*Old value = 0.*New value = 10\[^\n\]*\n" { set x [expr $x+1] ; exp_continue } -re ".*$prompt $" { } timeout { set timeout $saved_timeout send "123\n" exp_continue } } # Restore the timeout value. set timeout $saved_timeout # Examine the values in buf to see how many watchpoints we # should have printed. send "print buf\[0\]\n" expect { -re ".*= 49.*$prompt $" { set y [expr $y+1] } -re ".*= 0" { } default { fail "bogus value in buf[0]" } timeout { fail "retrieving contents of buf variable (timeout) } } send "print buf\[1\]\n" expect { -re ".*= 50.*$prompt $" { set y [expr $y+1] } -re ".*= 0" { } default { fail "bogus value in buf[1]" } timeout { fail "retrieving contents of buf variable (timeout) } } send "print buf\[2\]\n" expect { -re ".*= 51.*$prompt $" { set y [expr $y+1] } -re ".*= 0" { } default { fail "bogus value in buf[2]" } timeout { fail "retrieving contents of buf variable (timeout) } } send "print buf\[3\]\n" expect { -re ".*= 10.*$prompt $" { set y [expr $y+1] } -re ".*= 0" { } default { fail "bogus value in buf[3]" } timeout { fail "retrieving contents of buf variable (timeout) } } # Did we find what we were looking for? If not, flunk it. if [expr $x==$y] then { pass $testname } else { fail "$testname: Only triggered $x watchpoints, expected $y."} # Continue until we hit the finishing marker function. # Make sure we hit no more watchpoints. send "cont\n" expect { -re "Continuing.*Breakpoint.*marker4 \[)(\]+.*$prompt $" { pass "disabled watchpoint skipped" } -re "Continuing.*Watchpoint.*$prompt $" { fail "hit suprious watchpoint" ; return } -re ".*$prompt $" { fail "marker4 function missed" ; return } timeout { fail "run to marker4 function (timeout)" ; return } } # Disable everything so we can finish the program at full speed send "disable\n" expect { -re ".*$prompt $" { } timeout { fail "disabling breakpoints (timeout)" } } send "cont\n" expect { -re "Continuing.*Program exited normally.*$prompt $" { } -re ".*$prompt $" { fail "watchpoints not removed" ; return } timeout { fail "looking for process exit (timeout)" } } } } # Do a simple test of of watching through a pointer when the pointer # itself changes. Should add some more complicated stuff here. proc test_complex_watchpoint {} { global prompt set testname "Test complex watchpoint" if [runto marker4] then { gdb_test "watch ptr1->val" ".*\[Ww\]atchpoint \[0-9\]*: ptr1->val" gdb_test "break marker5" ".*Breakpoint.*" send "cont\n" expect { -re "Continuing.*Watchpoint.*ptr1->val.*Old value = 1.*New value = 2.*$prompt $" { pass $testname } default { fail $testname ; return } } # Continue until we hit the marker5 function. # Make sure we hit no more watchpoints. send "cont\n" expect { -re "Continuing.*Breakpoint.*marker5 \[)(\]+.*$prompt $" { pass "did not trigger wrong watchpoint" } -re "Continuing.*Watchpoint.*$prompt $" { fail "hit wrong watchpoint" ; return } -re ".*$prompt $" { fail "marker5 function missed" ; return } timeout { fail "run to marker5 function (timeout)" ; return } } # Disable everything so we can finish the program at full speed send "disable\n" expect { -re ".*$prompt $" { } timeout { fail "disabling breakpoints (timeout)" } } send "cont\n" expect { -re "Continuing.*Program exited normally.*$prompt $" { } -re ".*$prompt $" { fail "watchpoints not removed" ; return } timeout { fail "looking for process exit (timeout)" } } } } # Start with a fresh gdb. gdb_exit gdb_start gdb_reinitialize_dir $srcdir/$subdir gdb_load $objdir/$subdir/$binfile if [initialize] then { # Preserve the old timeout, and set a new one that should be # sufficient to step from marker1 to marker2 with watchpoints # set anywhere. set timeoutsave $timeout set timeout 60 test_simple_watchpoint # The IDT/sim monitor only has 8 (!) open files, of which it uses # 4 (!). So we have to make sure one program exits before # starting another one. if [istarget "mips-idt-*"] then { gdb_exit gdb_start gdb_reinitialize_dir $srcdir/$subdir gdb_load $objdir/$subdir/$binfile initialize } if [istarget "a29k-*-udi"] then { # FIXME: If PR 2415 is fixed, this is not needed. gdb_target_udi gdb_load $objdir/$subdir/$binfile } test_disabling_watchpoints # See above. if [istarget "mips-idt-*"] then { gdb_exit gdb_start gdb_reinitialize_dir $srcdir/$subdir gdb_load $objdir/$subdir/$binfile initialize } test_stepping # See above. if [istarget "mips-idt-*"] then { gdb_exit gdb_start gdb_reinitialize_dir $srcdir/$subdir gdb_load $objdir/$subdir/$binfile initialize } # This test hasn't been tested on anything but the PA. if [istarget "hppa*-*-*"] then { test_watchpoint_triggered_in_syscall } # See above. if [istarget "mips-idt-*"] then { gdb_exit gdb_start gdb_reinitialize_dir $srcdir/$subdir gdb_load $objdir/$subdir/$binfile initialize } # This test hasn't been tested on anything but the PA. if [istarget "hppa*-*-*"] then { test_complex_watchpoint } # Restore the preserved old timeout value. set timeout $timeoutsave } if [istarget "a29k-*-udi"] then { # FIXME: If PR 2415 is fixed, this is not needed. gdb_target_udi }