gdb/testsuite/gdb.base/continue-after-aborted-step-over.exp

   1 # Copyright 2018-2021 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 # This testcase is a regression test for a regression in the in-line
  17 # step-over machinery.  If a resumption that starts a step-over
  18 # failed, a following resumption would make GDB hang forever:
  19 #
  20 #  (gdb) b *0
  21 #  Breakpoint 2 at 0x0
  22 #  continue
  23 #  Continuing.
  24 #  Warning:
  25 #  Cannot insert breakpoint 2.
  26 #  Cannot access memory at address 0x0
  27 #
  28 #  Command aborted.
  29 #  delete breakpoints
  30 #  Delete all breakpoints? (y or n) y
  31 #  (gdb) b function
  32 #  Breakpoint 3 at 0x40048b: file test.c, line 33.
  33 #  continue
  34 #  Continuing.
  35 #  *GDB hangs forever*
  36
  37 standard_testfile
  38
  39 if {[build_executable "failed to prepare" $testfile $srcfile debug]} {
  40     return -1
  41 }
  42
  43 # DISPLACED indicates whether to use displaced-stepping.
  44 proc do_test {displaced breakpoint_always_inserted} {
  45     global gdb_prompt decimal
  46     global srcfile binfile
  47
  48     clean_restart $binfile
  49
  50     gdb_test_no_output "set displaced-stepping $displaced"
  51     gdb_test_no_output "set breakpoint always-inserted $breakpoint_always_inserted"
  52
  53     if ![runto_main] {
  54         fail "run to main"
  55         return -1
  56     }
  57
  58     # We rely on not being able to set a breakpoint at 0, as proxy for
  59     # any kind of breakpoint insertion failure.  If we can examine
  60     # what's at memory address 0, it is possible that we could also
  61     # execute it.
  62     if [is_address_zero_readable] {
  63         untested "memory at address 0 is possibly executable"
  64         return
  65     }
  66
  67     # Set a breakpoint that fails to insert.
  68     if { $breakpoint_always_inserted == "on" } {
  69         gdb_test "b *0" "Breakpoint $decimal at 0x0.*"
  70     } else {
  71         gdb_test "b *0" "Breakpoint $decimal at 0x0"
  72     }
  73
  74     gdb_test "continue" \
  75         "Command aborted\\." \
  76         "continue aborts"
  77
  78     # Delete the "bad" breakpoint and try continuing again.
  79     delete_breakpoints
  80     gdb_test "b function" "Breakpoint $decimal .*$srcfile.*"
  81
  82     gdb_test "continue" \
  83         "Breakpoint $decimal, function \\(\\) at .*$srcfile:.*" \
  84         "continue to function"
  85 }
  86
  87 # This testcase exercises a regression with the in-line step-over
  88 # machinery.  So make sure this runs with displaced stepping disabled,
  89 # and for good measure, also try with displaced stepping enabled.
  90 foreach_with_prefix displaced-stepping {"off" "on"} {
  91     foreach_with_prefix breakpoint-always-inserted {"off" "on"} {
  92         do_test ${displaced-stepping} ${breakpoint-always-inserted}
  93     }
  94 }