gdb/testsuite/gdb.base/step-over-exit.exp

   1 #   Copyright 2016 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 standard_testfile
  17
  18 # Test a thread is doing step-over a syscall instruction which is exit,
  19 # and GDBserver should cleanup its state of step-over properly.
  20
  21 set syscall_insn ""
  22
  23 # Define the syscall instruction for each target.
  24
  25 if { [istarget "i\[34567\]86-*-linux*"] || [istarget "x86_64-*-linux*"] } {
  26     set syscall_insn "\[ \t\](int|syscall|sysenter)\[ \t\]"
  27 } elseif { [istarget "aarch64*-*-linux*"] || [istarget "arm*-*-linux*"] } {
  28     set syscall_insn "\[ \t\](swi|svc)\[ \t\]"
  29 } else {
  30     unsupported "unknown syscall instruction"
  31     return -1
  32 }
  33
  34 if {[prepare_for_testing $testfile.exp $testfile $srcfile debug]} {
  35     untested $testfile.exp
  36     return -1
  37 }
  38
  39 # Start with a fresh gdb.
  40 clean_restart ${testfile}
  41 if ![runto_main] {
  42     fail "can't run to main"
  43     return -1
  44 }
  45
  46 gdb_test "set follow-fork-mode child"
  47 gdb_test "set detach-on-fork off"
  48
  49 # Step 1, find the syscall instruction address.
  50
  51 gdb_test "break _exit" "Breakpoint $decimal at .*"
  52
  53 # Hit the breakpoint on _exit.  The address of syscall insn is recorded.
  54
  55 gdb_test "continue" \
  56     "Continuing\\..*Breakpoint $decimal.*_exit \\(.*\\).*" \
  57     "continue to exit"
  58
  59 gdb_test "display/i \$pc" ".*"
  60
  61 # Single step until we see a syscall insn or we reach the
  62 # upper bound of loop iterations.
  63 set msg "find syscall insn in exit"
  64 set steps 0
  65 set max_steps 1000
  66 gdb_test_multiple "stepi" $msg {
  67     -re ".*$syscall_insn.*$gdb_prompt $" {
  68         pass $msg
  69     }
  70     -re "x/i .*=>.*\r\n$gdb_prompt $" {
  71         incr steps
  72         if {$steps == $max_steps} {
  73             fail $msg
  74         } else {
  75             send_gdb "stepi\n"
  76             exp_continue
  77         }
  78     }
  79 }
  80
  81 if {$steps == $max_steps} {
  82     return
  83 }
  84
  85 # Remove the display
  86 gdb_test_no_output "delete display 1"
  87
  88 set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"]
  89
  90 gdb_test "continue" "exited normally.*" "continue to end, first time"
  91 gdb_test "inferior 1" ".*Switching to inferior 1.*" \
  92     "switch back to inferior 1, first time"
  93
  94 delete_breakpoints
  95
  96 gdb_test "break marker"
  97
  98 gdb_test "continue" "Continuing\\..*Breakpoint $decimal, .*" \
  99     "continue to marker, first time"
 100
 101 # Step 2, create a breakpoint which evaluates false, and force it
 102 # evaluated on the target side.
 103
 104 set test "set breakpoint condition-evaluation target"
 105 gdb_test_multiple $test $test {
 106     -re "warning: Target does not support breakpoint condition evaluation.\r\nUsing host evaluation mode instead.\r\n$gdb_prompt $" {
 107         # Target doesn't support breakpoint condition evaluation
 108         # on its side, but it is no harm to run the test.
 109     }
 110     -re "^$test\r\n$gdb_prompt $" {
 111     }
 112 }
 113
 114 gdb_test "break \*$syscall_insn_addr if main == 0" \
 115     "Breakpoint \[0-9\]* at .*"
 116
 117 # Resume the child process, and the step-over is being done.
 118
 119 gdb_test "continue" "exited normally.*" "continue to end, second time"
 120 gdb_test "inferior 1" ".*Switching to inferior 1.*" \
 121     "switch back to inferior 1, second time"
 122
 123 # Switch back to the parent process, continue to the marker to
 124 # test GDBserver's state is still correct.
 125
 126 gdb_test "continue" "Continuing\\..*Breakpoint $decimal, .*" \
 127     "continue to marker, second time"