1# Copyright 2016-2020 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 16standard_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 21set syscall_insn "" 22 23# Define the syscall instruction for each target. 24 25if { [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 34if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} { 35 return -1 36} 37 38# Start with a fresh gdb. 39clean_restart ${testfile} 40if ![runto_main] { 41 fail "can't run to main" 42 return -1 43} 44 45gdb_test "set follow-fork-mode child" 46gdb_test "set detach-on-fork off" 47 48# Step 1, find the syscall instruction address. 49 50gdb_test "break _exit" "Breakpoint $decimal at .*" 51 52# Hit the breakpoint on _exit. The address of syscall insn is recorded. 53 54gdb_test "continue" \ 55 "Continuing\\..*Breakpoint $decimal.*_exit \\(.*\\).*" \ 56 "continue to exit" 57 58gdb_test "display/i \$pc" ".*" 59 60# Single step until we see a syscall insn or we reach the 61# upper bound of loop iterations. 62set msg "find syscall insn in exit" 63set steps 0 64set max_steps 1000 65gdb_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 $msg 73 } else { 74 send_gdb "stepi\n" 75 exp_continue 76 } 77 } 78} 79 80if {$steps == $max_steps} { 81 return 82} 83 84# Remove the display 85gdb_test_no_output "delete display 1" 86 87set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"] 88 89gdb_test "continue" "exited normally.*" "continue to end, first time" 90gdb_test "inferior 1" ".*Switching to inferior 1.*" \ 91 "switch back to inferior 1, first time" 92 93delete_breakpoints 94 95gdb_test "break marker" 96 97gdb_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 103set test "set breakpoint condition-evaluation target" 104gdb_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 $" { 110 } 111} 112 113gdb_test "break \*$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 119gdb_test "continue" "exited normally.*" "continue to end, second time" 120gdb_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 126gdb_test "continue" "Continuing\\..*Breakpoint $decimal, .*" \ 127 "continue to marker, second time" 128