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

   1 #   Copyright 2016-2022 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 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 "failed to prepare" $testfile $srcfile debug]} {
  35     return -1
  36 }
  37
  38 # Start with a fresh gdb.
  39 clean_restart ${testfile}
  40 if ![runto_main] {
  41     fail "can't run to main"
  42     return -1
  43 }
  44
  45 gdb_test "set follow-fork-mode child"
  46 gdb_test "set detach-on-fork off"
  47
  48 # Step 1, find the syscall instruction address.
  49
  50 gdb_test "break _exit" "Breakpoint $decimal at .*"
  51
  52 # Hit the breakpoint on _exit.  The address of syscall insn is recorded.
  53
  54 gdb_test "continue" \
  55     "Continuing\\..*Breakpoint $decimal.*_exit \\(.*\\).*" \
  56     "continue to exit"
  57
  58 gdb_test "display/i \$pc" ".*"
  59
  60 # Single step until we see a syscall insn or we reach the
  61 # upper bound of loop iterations.
  62 set msg "find syscall insn in exit"
  63 set steps 0
  64 set max_steps 1000
  65 gdb_test_multiple "stepi" $msg {
  66     -re ".*$syscall_insn.*$gdb_prompt $" {
  67         pass $msg
  68     }
  69     -re "x/i .*=>.*\r\n$gdb_prompt $" {
  70         incr steps
  71         if {$steps == $max_steps} {
  72             fail $msg
  73         } else {
  74             send_gdb "stepi\n"
  75             exp_continue
  76         }
  77     }
  78 }
  79
  80 if {$steps == $max_steps} {
  81     return
  82 }
  83
  84 # Remove the display
  85 gdb_test_no_output "delete display 1"
  86
  87 set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"]
  88
  89 gdb_test "continue" "exited normally.*" "continue to end, first time"
  90 gdb_test "inferior 1" ".*Switching to inferior 1.*" \
  91     "switch back to inferior 1, first time"
  92
  93 delete_breakpoints
  94
  95 gdb_test "break marker"
  96
  97 gdb_test "continue" "Continuing\\..*Breakpoint $decimal, .*" \
  98     "continue to marker, first time"
  99
 100 # Step 2, create a breakpoint which evaluates false, and force it
 101 # evaluated on the target side.
 102
 103 set test "set breakpoint condition-evaluation target"
 104 gdb_test_multiple $test $test {
 105     -re "warning: Target does not support breakpoint condition evaluation.\r\nUsing host evaluation mode instead.\r\n$gdb_prompt $" {
 106         # Target doesn't support breakpoint condition evaluation
 107         # on its side, but it is no harm to run the test.
 108     }
 109     -re "^$test\r\n$gdb_prompt $" {
 110     }
 111 }
 112
 113 gdb_test "break \*$syscall_insn_addr if main == 0" \
 114     "Breakpoint \[0-9\]* at .*" \
 115     "set conditional break at syscall address"
 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"