mirror of
https://sourceware.org/git/binutils-gdb.git
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301 lines
9.1 KiB
Plaintext
301 lines
9.1 KiB
Plaintext
# Copyright (C) 2014-2018 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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# This file is part of the gdb testsuite.
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# Test stepping over permanent breakpoints.
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standard_testfile
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set options { debug }
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if { ![target_info exists gdb,nosignals] } {
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lappend options "additional_flags=-DSIGNALS"
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}
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if {[build_executable "failed to prepare" $testfile $srcfile $options]} {
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return -1
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}
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set line_bp [gdb_get_line_number "write permanent bp"]
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# The test proper. ALWAYS_INSERTED indicates whether testing in
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# "breakpoint always-inserted" mode. If SW_WATCHPOINT is true, set a
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# software watchpoint, which forces constantly single-stepping, and
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# exercises stepping the permanent breakpoint while delivering a
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# signal at the same time.
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proc test {always_inserted sw_watchpoint} {
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global line_bp
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global hex decimal
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global gdb_prompt
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global srcfile binfile
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clean_restart $binfile
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if ![runto_main] then {
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return -1
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}
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gdb_test "set breakpoint always-inserted $always_inserted"
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if {$sw_watchpoint} {
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# Watching a convenience variable forces a software
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# watchpoint.
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gdb_test "watch \$dummy_convenience" "Watchpoint .*"
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}
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set address_bp ""
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set address_after_bp ""
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with_test_prefix "setup" {
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# Set a breakpoint where we'll manually plant a permanent
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# breakpoint.
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set test "set probe breakpoint"
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gdb_test_multiple "break $line_bp" $test {
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-re "Breakpoint .* at ($hex).*$gdb_prompt $" {
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set address_bp $expect_out(1,string)
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pass $test
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}
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}
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if {$address_bp == ""} {
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return
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}
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# Get the size of the instruction where the breakpoint will
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# manually inserted.
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set test "get size of instruction"
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gdb_test_multiple "x/2i $address_bp" $test {
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-re ".*$hex <test\\+$decimal>:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" {
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set address_after_bp $expect_out(1,string)
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pass $test
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}
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}
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if {$address_after_bp == ""} {
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return
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}
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# Write address range where the breakpoint is inserted to the
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# corresponding variables in the inferior.
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gdb_test "p /x addr_bp = $address_bp" " = $address_bp" \
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"write addr_bp"
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gdb_test "p /x addr_after_bp = $address_after_bp" " = $address_after_bp" \
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"write addr_after_bp"
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# Run the "setup" function in the inferior. This memcpy's the
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# breakpoint instruction to a buffer in the inferior.
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gdb_test "next" "test_basics \\(\\).*" "next over setup"
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delete_breakpoints
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# We now have the breakpoint instruction stored in 'buffer'. Poke it
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# to memory manually.
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set count [expr $address_after_bp - $address_bp]
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for {set i 0} {$i < $count} {incr i} {
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set test "p /x addr_bp\[$i\] = buffer\[$i\]"
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gdb_test_multiple $test $test {
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-re "Cannot access memory at address $hex.*$gdb_prompt $" {
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# Some targets (QEMU for one) will disallow writes to the
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# .text section under certain circumstances. It is no use
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# continuing with the test at this point. Just return.
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unsupported "cannot modify memory"
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return
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}
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-re " = .*$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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with_test_prefix "basics" {
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# Run to the permanent breakpoint, just to make sure we've inserted it
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# correctly.
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# If the target fails to stop, the remainder of the test will not work
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# so just return. This can happen on some simulator targets where
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# the running program doesn't see breakpoints that are visible to
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# the execution engine, or where writes to the .text section are
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# quietly ignored.
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set test "permanent breakpoint causes random signal"
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gdb_test_multiple "continue" $test {
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-re "exited normally.*$gdb_prompt $" {
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unsupported "failed to stop at permanent breakpoint"
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return
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}
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-re "Program received signal SIGTRAP.*$gdb_prompt $" {
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pass $test
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}
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}
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# Now set a breakpoint on top, thus creating a permanent breakpoint.
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gdb_breakpoint "$line_bp"
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# Depending on whether this is a decr_pc_after_break arch, the PC will
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# be either pointing at the permanent breakpoint address, or just
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# after. Set the GDB breakpoint on top, and continue, twice. At
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# least once, GDB will need to step-over the permanent breakpoint.
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gdb_test "continue" "Breakpoint .*" "stop at permanent breakpoint"
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gdb_test "p \$prev_counter = counter" " = $decimal"
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gdb_test "continue" "Breakpoint .*" "stop at permanent breakpoint twice"
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# Check that indeed the continue made progress, instead of re-trapping
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# without advancing.
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gdb_test "p counter - \$prev_counter" " = 1"
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gdb_test "info breakpoints" \
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"breakpoint.*keep.*y.*$hex.*in test at .*$srcfile:$line_bp.*already hit 2 times.*" \
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"info breakpoints show enabled breakpoint"
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gdb_test "disable \$bpnum"
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gdb_test "commands\nset \$commands_ran = 1\nend" "" \
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"set breakpoint commands"
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gdb_test "info breakpoints" \
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"breakpoint.*keep.*n.*$hex.*in test at .*$srcfile:$line_bp.*already hit 2 times.*" \
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"info breakpoints shows disabled breakpoint"
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# Run to the permanent breakpoint again. This time, since it's
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# disabled, it should act as if we hadn't created it in the first
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# place. IOW, we should get a random signal, and, the breakpoint's
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# command should not run.
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gdb_test "continue" "Program received signal SIGTRAP.*" \
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"disabled permanent breakpoint doesn't explain stop"
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gdb_test "info breakpoints" \
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"breakpoint.*keep.*n.*$hex.*in test at .*$srcfile:$line_bp.*already hit 2 times.*" \
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"info breakpoints still shows same number of hits"
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gdb_test "print \$commands_ran" " = void" \
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"breakpoint commands didn't run"
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# Reenable the breakpoint, and check that it gets hit and accounted
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# for this time.
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gdb_test "enable \$bpnum" "" "reenable breakpoint"
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gdb_test "continue" "Breakpoint .*" \
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"stop at permanent breakpoint thrice"
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gdb_test "info breakpoints" \
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"breakpoint.*keep.*y.*$hex.*in test at .*$srcfile:$line_bp.*already hit 3 times.*" \
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"info breakpoints shows one more hit"
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gdb_test "print \$commands_ran" " = 1" "breakpoint commands ran"
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# Check that stepi advances only past the permanent breakpoint, and
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# not a single instruction more.
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gdb_test "stepi" "after permanent bp .*" \
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"single-step past permanent breakpoint"
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}
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with_test_prefix "next trips on permanent bp" {
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delete_breakpoints
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gdb_breakpoint "test_next"
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gdb_continue_to_breakpoint "test_next"
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gdb_breakpoint "$line_bp"
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gdb_test "condition \$bpnum 0"
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gdb_test "next" "after next .*"
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}
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if ![target_info exists gdb,nosignals] {
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with_test_prefix "continue trips on nested permanent bp" {
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delete_breakpoints
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gdb_breakpoint "test_signal_nested"
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gdb_continue_to_breakpoint "test_signal_nested"
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gdb_breakpoint "$line_bp"
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gdb_continue_to_breakpoint "permanent bp"
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gdb_test "condition \$bpnum 0"
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# Let SIGALRM trigger.
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sleep 2
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# We're now stopped at a permanent breakpoint, with a
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# signal pending.
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gdb_breakpoint "test_signal_nested_done"
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gdb_continue_to_breakpoint "test_signal_nested_done"
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# Ensure that the handler did run. There's one call to
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# test in the mainline code, and another in the signal
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# handler.
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gdb_test "p counter" " = 2"
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}
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if [can_single_step_to_signal_handler] {
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with_test_prefix "stepi signal with handler" {
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delete_breakpoints
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gdb_breakpoint "test_signal_with_handler"
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gdb_continue_to_breakpoint "test_signal_with_handler"
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gdb_breakpoint "$line_bp"
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gdb_test "continue" "Breakpoint .*" "stop at permanent breakpoint"
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gdb_test "queue-signal SIGUSR1"
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set test "single-step to handler"
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gdb_test_multiple "stepi" $test {
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-re "Program received signal SIGTRAP.*$gdb_prompt $" {
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fail $test
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}
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-re "handler .*$gdb_prompt $" {
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pass $test
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}
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}
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# Check that the mainline PC points at the permanent
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# breakpoint.
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gdb_test "up 2" "test .*" "up to mainline code"
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gdb_test "p /x \$pc" " = $address_bp" \
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"mainline pc points at permanent breakpoint"
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gdb_test "continue" "Breakpoint .*" \
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"stop at permanent breakpoint, out of handler"
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}
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with_test_prefix "stepi signal with no handler" {
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gdb_breakpoint "test_signal_no_handler"
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gdb_continue_to_breakpoint "test_signal_no_handler"
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gdb_test "continue" "Breakpoint .*" "stop at permanent breakpoint"
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gdb_test "queue-signal SIGUSR1"
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gdb_test "stepi" "after permanent bp .*" \
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"single-step past permanent breakpoint"
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}
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}
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}
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}
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foreach always_inserted {off on} {
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foreach sw_watchpoint {0 1} {
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with_test_prefix "always_inserted=$always_inserted, sw_watchpoint=$sw_watchpoint" {
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test $always_inserted $sw_watchpoint
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}
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}
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}
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