544 lines
16 KiB
Plaintext
544 lines
16 KiB
Plaintext
# Copyright 2004-2015 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# The program sigstep.c creates a very simple backtrace containing one
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# signal handler and signal trampoline. A flag is set and then the
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# handler returns. This is repeated at infinitum.
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# This test runs the program up to the signal handler, and then
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# attempts to step/next out of the handler and back into main.
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if [target_info exists gdb,nosignals] {
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verbose "Skipping sigstep.exp because of nosignals."
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continue
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}
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standard_testfile
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if {[build_executable $testfile.exp $testfile $srcfile debug]} {
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untested $testfile.exp
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return -1
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}
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set clear_done [gdb_get_line_number {done = 0}]
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set infinite_loop [gdb_get_line_number {while (!done)}]
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set other_handler_location [gdb_get_line_number "other handler location"]
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# Restart GDB, set a display showing $PC, and run to main.
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proc restart {} {
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global binfile
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clean_restart $binfile
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gdb_test "display/i \$pc"
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runto_main
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}
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# Pass all the alarms straight through (but verbosely)
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# gdb_test "handle SIGALRM print pass nostop"
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# gdb_test "handle SIGVTALRM print pass nostop"
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# gdb_test "handle SIGPROF print pass nostop"
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# Run to the signal handler, validate the backtrace.
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proc validate_backtrace {} {
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with_test_prefix "validate backtrace" {
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restart
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gdb_test "break handler"
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gdb_test "continue" ".* handler .*" "continue to stepi handler"
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gdb_test_sequence "bt" "backtrace for nexti" {
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"\[\r\n\]+.0 \[^\r\n\]* handler "
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"\[\r\n\]+.1 .signal handler called."
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"\[\r\n\]+.2 \[^\r\n\]* main "
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}
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}
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}
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validate_backtrace
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# Goes to handler using ENTER_CMD, runs IN_HANDLER while in the signal
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# hander, and then steps out of the signal handler using EXIT_CMD.
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proc advance { enter_cmd in_handler_prefix in_handler exit_cmd } {
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global gdb_prompt inferior_exited_re
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global clear_done other_handler_location
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set prefix "$enter_cmd to handler, $in_handler_prefix in handler, $exit_cmd from handler"
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with_test_prefix $prefix {
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restart
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# Get us into the handler
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if { $enter_cmd == "continue" } {
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gdb_test "break handler"
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} else {
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gdb_test "handle SIGALRM print pass stop"
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gdb_test "handle SIGVTALRM print pass stop"
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gdb_test "continue" "Program received signal.*" "continue to signal"
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}
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gdb_test "$enter_cmd" ".*handler .*" "$enter_cmd to handler"
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delete_breakpoints
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uplevel 1 $in_handler
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if { $exit_cmd == "continue" } {
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gdb_test "break $clear_done" ".*" "break clear done"
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}
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set test "leave handler"
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gdb_test_multiple "$exit_cmd" "${test}" {
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-re "Could not insert single-step breakpoint.*$gdb_prompt $" {
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setup_kfail gdb/8841 "sparc*-*-openbsd*"
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fail "$test (could not insert single-step breakpoint)"
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}
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-re "done = 1;.*${gdb_prompt} $" {
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send_gdb "$exit_cmd\n"
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exp_continue -continue_timer
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}
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-re "\} .. handler .*${gdb_prompt} $" {
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send_gdb "$exit_cmd\n"
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exp_continue -continue_timer
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}
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-re "$inferior_exited_re normally.*${gdb_prompt} $" {
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setup_kfail gdb/8744 powerpc-*-*bsd*
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fail "$test (program exited)"
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}
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-re "(while ..done|done = 0).*${gdb_prompt} $" {
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# After stepping out of a function /r signal-handler, GDB will
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# advance the inferior until it is at the first instruction of
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# a code-line. While typically things return to the middle of
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# the "while..." (and hence GDB advances the inferior to the
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# "return..." line) it is also possible for the return to land
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# on the first instruction of "while...". Accept both cases.
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pass "$test"
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}
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}
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}
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}
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# Map of PREFIX => "things to do within the signal handler", for the
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# advance tests.
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set in_handler_map {
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"nothing" {
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}
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"si+advance" {
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# Advance to the second location in handler.
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gdb_test "si" "handler.*" "si in handler"
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set test "advance in handler"
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gdb_test_multiple "advance $other_handler_location" $test {
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-re "Program received signal SIGTRAP.*$gdb_prompt $" {
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# On some versions of Linux (observed on
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# 3.16.4-200.fc20.x86_64), using PTRACE_SINGLESTEP+sig
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# to step into a signal handler, and then issuing
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# another PTRACE_SINGLESTEP within the handler ends up
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# with $eflags.TF mistakenly set, which results in
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# subsequent PTRACE_CONTINUEs trapping after each
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# insn.
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if {$enter_cmd != "continue"} {
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setup_xfail "i?86-*-linux*" gdb/17511
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setup_xfail "x86_64-*-linux*" gdb/17511
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}
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fail "$test (spurious SIGTRAP)"
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return
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}
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-re "other handler location.*$gdb_prompt $" {
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pass $test
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}
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}
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}
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}
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# Check that we can step/next/continue, etc. our way in and out of a
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# signal handler. Also test that we can step, and run to a breakpoint
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# within the handler.
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foreach enter_cmd { "stepi" "nexti" "step" "next" "continue" } {
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if { $enter_cmd != "continue" && ![can_single_step_to_signal_handler] } {
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continue
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}
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foreach exit_cmd { "step" "next" "continue" } {
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foreach {in_handler_prefix in_handler} $in_handler_map {
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advance $enter_cmd $in_handler_prefix $in_handler $exit_cmd
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}
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}
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}
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proc advancei { cmd } {
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global gdb_prompt inferior_exited_re
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with_test_prefix "$cmd from handleri" {
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restart
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# Get us into the handler.
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gdb_test "break handler"
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gdb_test "continue" ".* handler .*" "continue to handler"
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set program_exited 0
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set test "leave handler"
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gdb_test_multiple "$cmd" "${test}" {
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-re "Cannot insert breakpoint 0.*${gdb_prompt} $" {
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# Some platforms use a special read-only page for signal
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# trampolines. We can't set a breakpoint there, and we
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# don't gracefully fall back to single-stepping.
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setup_kfail gdb/8841 "i?86-*-linux*"
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setup_kfail gdb/8841 "*-*-openbsd*"
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fail "$test (could not set breakpoint)"
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return
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}
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-re "Could not insert single-step breakpoint.*$gdb_prompt $" {
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setup_kfail gdb/8841 "sparc*-*-openbsd*"
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fail "$test (could not insert single-step breakpoint)"
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}
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-re "Breakpoint \[0-9\]*, handler .*${gdb_prompt} $" {
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fail "$test (hit breakpoint again)"
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}
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-re "done = 1;.*${gdb_prompt} $" {
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send_gdb "$cmd\n"
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exp_continue -continue_timer
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}
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-re "\} .. handler .*${gdb_prompt} $" {
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send_gdb "$cmd\n"
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exp_continue -continue_timer
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}
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-re "signal handler called.*${gdb_prompt} $" {
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pass "$test"
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}
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-re "main .*${gdb_prompt} $" {
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fail "$test (in main)"
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}
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-re "$inferior_exited_re normally.*${gdb_prompt} $" {
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fail "$test (program exited)"
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set program_exited 1
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}
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-re "Make handler return now.*y or n. $" {
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send_gdb "y\n"
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exp_continue -continue_timer
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}
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}
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set test "leave signal trampoline"
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gdb_test_multiple "$cmd" "${test}" {
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-re "while .*${gdb_prompt} $" {
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pass "$test (in main)"
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}
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-re "signal handler called.*${gdb_prompt} $" {
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send_gdb "$cmd\n"
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exp_continue -continue_timer
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}
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-re "return .*${gdb_prompt} $" {
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fail "$test (stepped)"
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}
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-re "Make .*frame return now.*y or n. $" {
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send_gdb "y\n"
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exp_continue -continue_timer
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}
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-re "$inferior_exited_re normally.*${gdb_prompt} $" {
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kfail gdb/8744 "$test (program exited)"
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set program_exited 1
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}
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-re "The program is not being run.*${gdb_prompt} $" {
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if { $program_exited } {
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# Previously kfailed with an exit
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pass "$test (the program is not being run)"
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} else {
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fail "$test (the program is not being run)"
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}
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}
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}
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}
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}
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# Check that we can step our way out of a signal handler, using
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# commands that first step out to the signal trampoline, and then out
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# to the mainline code.
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foreach cmd {"stepi" "nexti" "finish" "return"} {
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advancei $cmd
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}
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# Check that we can step/next our way into / over a signal handler.
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# There are at least the following cases: breakpoint @pc VS breakpoint
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# in handler VS step / next / continue.
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# Try stepping when there's a signal pending, and a breakpoint at the
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# handler. Should step into the signal handler.
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proc skip_to_handler { cmd } {
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global infinite_loop
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with_test_prefix "$cmd to handler" {
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restart
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# Use the real-time itimer, as otherwize the process never gets
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# enough time to expire the timer.
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gdb_test_no_output "set itimer = itimer_real"
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# Advance to the infinite loop.
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gdb_test "advance $infinite_loop" ".*" "advance to infinite loop"
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# Make the signal pending.
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sleep 1
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# Insert the handler breakpoint.
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gdb_test "break handler" ".*" "break handler"
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# Step into the handler.
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gdb_test "$cmd" " handler .*" "performing $cmd"
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}
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}
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foreach cmd {"step" "next" "continue"} {
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skip_to_handler $cmd
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}
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# Try stepping when there's a signal pending, and a breakpoint at the
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# handler's entry-point. Should step into the signal handler stopping
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# at the entry-point.
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# Some systems (e.x., GNU/Linux as of 2004-08-30), when delivering a
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# signal, resume the process at the first instruction of the signal
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# handler and not the first instruction of the signal trampoline. The
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# stack is constructed such that the signal handler still appears to
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# have been called by the trampoline code. This test checks that it
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# is possible to stop the inferior, even at that first instruction.
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proc skip_to_handler_entry { cmd } {
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global infinite_loop
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with_test_prefix "$cmd to handler entry" {
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restart
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# Use the real-time itimer, as otherwize the process never gets
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# enough time to expire the timer.
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gdb_test_no_output "set itimer = itimer_real"
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# Advance to the infinite loop.
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gdb_test "advance $infinite_loop" ".*" "advance to infinite loop"
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# Make the signal pending.
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sleep 1
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# Insert / remove the handler breakpoint.
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gdb_test "break *handler" ".*" "break handler"
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gdb_test "$cmd" " handler .*" "performing $cmd"
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}
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}
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foreach cmd {"stepi" "nexti" "step" "next" "continue"} {
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skip_to_handler_entry $cmd
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}
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# Get the address of where a single-step should land.
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proc get_next_pc {test} {
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global gdb_prompt
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global hex
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set next ""
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gdb_test_multiple "x/2i \$pc" $test {
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-re "$hex .*:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" {
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set next $expect_out(1,string)
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pass $test
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}
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}
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return $next
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}
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# Test that the command skipped over the handler.
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proc test_skip_handler {cmd} {
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if {$cmd == "stepi" || $cmd == "nexti"} {
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set next_pc [get_next_pc "get next PC"]
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gdb_test "$cmd" "dummy = 0.*" "performing $cmd"
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gdb_test "p /x \$pc" " = $next_pc" "advanced"
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} else {
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gdb_test "$cmd" "done = 0.*" "performing $cmd"
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}
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}
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# Try stepping when there's a signal pending but no breakpoints.
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# Should skip the handler advancing to the next line.
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proc skip_over_handler { cmd } {
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global infinite_loop
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global clear_done
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with_test_prefix "$cmd over handler" {
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restart
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# Use the real-time itimer, as otherwize the process never gets
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# enough time to expire the timer.
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gdb_test_no_output "set itimer = itimer_real"
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gdb_test "break $clear_done" ".*" "break clear done"
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# Advance to the infinite loop.
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gdb_test "advance $infinite_loop" ".*" "advance to infinite loop"
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# Make the signal pending.
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sleep 1
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test_skip_handler $cmd
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}
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}
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foreach cmd {"stepi" "nexti" "step" "next" "continue"} {
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skip_over_handler $cmd
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}
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# Try stepping when there's a signal pending, a pre-existing
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# breakpoint at the current instruction, and a breakpoint in the
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# handler. Should advance to the signal handler.
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proc breakpoint_to_handler { cmd } {
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global infinite_loop
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with_test_prefix "$cmd on breakpoint, to handler" {
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restart
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# Use the real-time itimer, as otherwize the process never gets
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# enough time to expire the timer.
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gdb_test_no_output "set itimer = itimer_real"
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gdb_test "break $infinite_loop" ".*" "break infinite loop"
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gdb_test "break handler" ".*" "break handler"
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# Continue to the infinite loop.
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gdb_test "continue" "while ..done.*" "continue to infinite loop"
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# Make the signal pending.
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sleep 1
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gdb_test "$cmd" " handler .*" "performing $cmd"
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}
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}
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foreach cmd {"step" "next" "continue"} {
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breakpoint_to_handler $cmd
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}
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# Try stepping when there's a signal pending, and a breakpoint at the
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# handler's entry instruction and a breakpoint at the current
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# instruction. Should step into the signal handler and breakpoint at
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# that entry instruction.
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# Some systems (e.x., GNU/Linux as of 2004-08-30), when delivering a
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# signal, resume the process at the first instruction of the signal
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# handler and not the first instruction of the signal trampoline. The
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# stack is constructed such that the signal handler still appears to
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# have been called by the trampoline code. This test checks that it
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# is possible to stop the inferior, even at that first instruction.
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proc breakpoint_to_handler_entry { cmd } {
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global infinite_loop
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with_test_prefix "$cmd on breakpoint, to handler entry" {
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restart
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# Use the real-time itimer, as otherwize the process never gets
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# enough time to expire the timer.
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gdb_test_no_output "set itimer = itimer_real"
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gdb_test "break $infinite_loop" ".*" "break infinite loop"
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gdb_test "break *handler" ".*" "break handler"
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# Continue to the infinite loop.
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gdb_test "continue" "while ..done.*" "continue to infinite loop"
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# Make the signal pending.
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sleep 1
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gdb_test "$cmd" " handler .*" "performing $cmd"
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}
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}
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foreach cmd {"step" "next" "continue"} {
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breakpoint_to_handler_entry $cmd
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}
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# Try stepping when there's a signal pending, and a pre-existing
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# breakpoint at the current instruction, and no breakpoint in the
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# handler. Should advance to the next line/instruction. If SW_WATCH
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# is true, set a software watchpoint, which exercises stepping the
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# breakpoint instruction while delivering a signal at the same time.
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# If NO_HANDLER, arrange for the signal's handler be SIG_IGN, thus
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# when the software watchpoint is also set, testing stepping a
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# breakpoint instruction and immediately triggering the breakpoint
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# (exercises adjust_pc_after_break logic).
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proc breakpoint_over_handler { cmd with_sw_watch no_handler } {
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global infinite_loop
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global clear_done
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set prefix "$cmd on breakpoint, skip handler"
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if { $with_sw_watch } {
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append prefix ", with sw-watchpoint"
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}
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if { $no_handler } {
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append prefix ", no handler"
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}
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with_test_prefix "$prefix" {
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restart
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# Use the real-time itimer, as otherwize the process never gets
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# enough time to expire the timer.
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gdb_test_no_output "set itimer = itimer_real"
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if {$no_handler} {
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gdb_test "print no_handler = 1" " = 1" \
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"set no_handler"
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}
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gdb_test "break $infinite_loop" ".*" "break infinite loop"
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gdb_test "break $clear_done" ".*" "break clear done"
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# Continue to the infinite loop
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gdb_test "continue" "while ..done.*" "continue to infinite loop"
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# Make the signal pending
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sleep 1
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if { $with_sw_watch } {
|
|
# A watchpoint on a convenience variable is always a
|
|
# software watchpoint.
|
|
gdb_test "watch \$convenience" "Watchpoint .*: \\\$convenience"
|
|
}
|
|
|
|
if {$no_handler} {
|
|
# With no handler, we need to set the global ourselves
|
|
# manually.
|
|
gdb_test "print done = 1" " = 1" "set done"
|
|
}
|
|
|
|
test_skip_handler $cmd
|
|
}
|
|
}
|
|
|
|
foreach cmd {"stepi" "nexti" "step" "next" "continue"} {
|
|
foreach with_sw_watch {0 1} {
|
|
foreach no_handler {0 1} {
|
|
breakpoint_over_handler $cmd $with_sw_watch $no_handler
|
|
}
|
|
}
|
|
}
|