270 lines
9.3 KiB
Plaintext
270 lines
9.3 KiB
Plaintext
# This testcase is part of GDB, the GNU debugger.
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# Copyright 2004-2016 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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# Check that GDB can and only executes single instructions when
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# stepping through a sequence of breakpoints interleaved by a signal
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# handler.
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# This test is known to tickle the following problems: kernel letting
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# the inferior execute both the system call, and the instruction
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# following, when single-stepping a system call; kernel failing to
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# propogate the single-step state when single-stepping the sigreturn
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# system call, instead resuming the inferior at full speed; GDB
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# doesn't know how to software single-step across a sigreturn
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# instruction. Since the kernel problems can be "fixed" using
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# software single-step this is KFAILed rather than XFAILed.
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if [target_info exists gdb,nosignals] {
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verbose "Skipping sigbpt.exp because of nosignals."
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continue
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}
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standard_testfile
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if {[prepare_for_testing $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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#
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# Run to `main' where we begin our tests.
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#
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if ![runto_main] then {
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gdb_suppress_tests
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}
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# If we can examine what's at memory address 0, it is possible that we
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# could also execute it. This could probably make us run away,
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# executing random code, which could have all sorts of ill effects,
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# especially on targets without an MMU. Don't run the tests in that
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# case.
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if { [is_address_zero_readable] } {
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untested "Memory at address 0 is possibly executable"
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return
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}
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gdb_test "break keeper"
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# Run to bowler, and then single step until there's a SIGSEGV. Record
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# the address of each single-step instruction (up to and including the
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# instruction that causes the SIGSEGV) in bowler_addrs, and the address
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# of the actual SIGSEGV in segv_addr.
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# Note: this test detects which signal is received. Usually it is SIGSEGV
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# (and we use SIGSEGV in comments) but on Darwin it is SIGBUS.
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set bowler_addrs bowler
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set segv_addr none
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gdb_test {display/i $pc}
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gdb_test "advance bowler" "bowler.*" "advance to the bowler"
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set test "stepping to fault"
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set signame "SIGSEGV"
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gdb_test_multiple "stepi" "$test" {
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-re "Program received signal (SIGBUS|SIGSEGV).*pc(\r\n| *) *=> (0x\[0-9a-f\]*).*$gdb_prompt $" {
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set signame $expect_out(1,string)
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set segv_addr $expect_out(3,string)
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pass "$test"
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}
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-re " .*pc(\r\n| *)=> (0x\[0-9a-f\]*).*bowler.*$gdb_prompt $" {
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set bowler_addrs [concat $expect_out(2,string) $bowler_addrs]
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send_gdb "stepi\n"
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exp_continue
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}
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}
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# Now record the address of the instruction following the faulting
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# instruction in bowler_addrs.
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set test "get insn after fault"
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gdb_test_multiple {x/2i $pc} "$test" {
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-re "=> (0x\[0-9a-f\]*).*bowler.*(0x\[0-9a-f\]*).*bowler.*$gdb_prompt $" {
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set bowler_addrs [concat $expect_out(2,string) $bowler_addrs]
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pass "$test"
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}
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}
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# Procedures for returning the address of the instruction before, at
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# and after, the faulting instruction.
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proc before_segv { } {
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global bowler_addrs
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return [lindex $bowler_addrs 2]
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}
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proc at_segv { } {
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global bowler_addrs
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return [lindex $bowler_addrs 1]
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}
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proc after_segv { } {
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global bowler_addrs
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return [lindex $bowler_addrs 0]
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}
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# Check that the address table and SIGSEGV correspond.
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set test "Verify that ${signame} occurs at the last STEPI insn"
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if {[string compare $segv_addr [at_segv]] == 0} {
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pass "$test"
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} else {
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fail "$test ($segv_addr [at_segv])"
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}
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# Check that the inferior is correctly single stepped all the way back
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# to a faulting instruction.
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proc stepi_out { name args } {
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global gdb_prompt
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global signame
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# Set SIGSEGV to pass+nostop and then run the inferior all the way
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# through to the signal handler. With the handler is reached,
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# disable SIGSEGV, ensuring that further signals stop the
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# inferior. Stops a SIGSEGV infinite loop when a broke system
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# keeps re-executing the faulting instruction.
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rerun_to_main
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gdb_test "handle ${signame} nostop print pass" ".*" "${name}; pass ${signame}"
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gdb_test "continue" "keeper.*" "${name}; continue to keeper"
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gdb_test "handle ${signame} stop print nopass" ".*" "${name}; nopass ${signame}"
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# Insert all the breakpoints. To avoid the need to step over
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# these instructions, this is delayed until after the keeper has
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# been reached.
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for {set i 0} {$i < [llength $args]} {incr i} {
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gdb_test "break [lindex $args $i]" "Breakpoint.*" \
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"${name}; set breakpoint $i of [llength $args]"
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}
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# Single step our way out of the keeper, through the signal
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# trampoline, and back to the instruction that faulted.
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set test "${name}; stepi out of handler"
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gdb_test_multiple "stepi" "$test" {
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-re "Could not insert single-step breakpoint.*$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 "Cannot insert breakpoint.*Cannot access memory.*$gdb_prompt $" {
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setup_kfail gdb/8841 "nios2*-*-linux*"
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fail "$test (could not insert single-step breakpoint)"
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}
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-re "keeper.*$gdb_prompt $" {
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send_gdb "stepi\n"
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exp_continue
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}
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-re "signal handler.*$gdb_prompt $" {
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send_gdb "stepi\n"
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exp_continue
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}
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-re "Program received signal SIGSEGV.*$gdb_prompt $" {
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kfail gdb/8807 "$test (executed fault insn)"
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}
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-re "Breakpoint.*pc(\r\n| *)[at_segv] .*bowler.*$gdb_prompt $" {
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pass "$test (at breakpoint)"
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}
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-re "Breakpoint.*pc(\r\n| *)[after_segv] .*bowler.*$gdb_prompt $" {
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kfail gdb/8807 "$test (executed breakpoint)"
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}
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-re "pc(\r\n| *)[at_segv] .*bowler.*$gdb_prompt $" {
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pass "$test"
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}
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-re "pc(\r\n| *)[after_segv] .*bowler.*$gdb_prompt $" {
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kfail gdb/8807 "$test (skipped fault insn)"
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}
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-re "pc(\r\n| *)=> 0x\[a-z0-9\]* .*bowler.*$gdb_prompt $" {
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kfail gdb/8807 "$test (corrupt pc)"
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}
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}
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# Clear any breakpoints
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for {set i 0} {$i < [llength $args]} {incr i} {
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gdb_test "clear [lindex $args $i]" "Deleted .*" \
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"${name}; clear breakpoint $i of [llength $args]"
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}
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}
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# Let a signal handler exit, returning to a breakpoint instruction
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# inserted at the original fault instruction. Check that the
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# breakpoint is hit, and that single stepping off that breakpoint
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# executes the underlying fault instruction causing a SIGSEGV.
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proc cont_out { name args } {
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global gdb_prompt
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global signame
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# Set SIGSEGV to pass+nostop and then run the inferior all the way
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# through to the signal handler. With the handler is reached,
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# disable SIGSEGV, ensuring that further signals stop the
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# inferior. Stops a SIGSEGV infinite loop when a broke system
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# keeps re-executing the faulting instruction.
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rerun_to_main
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gdb_test "handle ${signame} nostop print pass" ".*" "${name}; pass ${signame}"
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gdb_test "continue" "keeper.*" "${name}; continue to keeper"
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gdb_test "handle ${signame} stop print nopass" ".*" "${name}; nopass ${signame}"
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# Insert all the breakpoints. To avoid the need to step over
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# these instructions, this is delayed until after the keeper has
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# been reached. Always set a breakpoint at the signal trampoline
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# instruction.
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set args [concat $args "*[at_segv]"]
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for {set i 0} {$i < [llength $args]} {incr i} {
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gdb_test "break [lindex $args $i]" "Breakpoint.*" \
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"${name}; set breakpoint $i of [llength $args]"
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}
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# Let the handler return, it should "appear to hit" the breakpoint
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# inserted at the faulting instruction. Note that the breakpoint
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# instruction wasn't executed, rather the inferior was SIGTRAPed
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# with the PC at the breakpoint.
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gdb_test "continue" "Breakpoint.*pc(\r\n| *)=> [at_segv] .*" \
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"${name}; continue to breakpoint at fault"
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# Now single step the faulted instrction at that breakpoint.
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gdb_test "stepi" \
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"Program received signal ${signame}.*pc(\r\n| *)=> [at_segv] .*" \
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"${name}; stepi fault"
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# Clear any breakpoints
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for {set i 0} {$i < [llength $args]} {incr i} {
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gdb_test "clear [lindex $args $i]" "Deleted .*" \
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"${name}; clear breakpoint $i of [llength $args]"
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}
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}
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# Try to confuse DECR_PC_AFTER_BREAK architectures by scattering
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# breakpoints around the faulting address. In all cases the inferior
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# should single-step out of the signal trampoline halting (but not
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# executing) the fault instruction.
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stepi_out "stepi"
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stepi_out "stepi bp before segv" "*[before_segv]"
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stepi_out "stepi bp at segv" "*[at_segv]"
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stepi_out "stepi bp before and at segv" "*[at_segv]" "*[before_segv]"
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# Try to confuse DECR_PC_AFTER_BREAK architectures by scattering
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# breakpoints around the faulting address. In all cases the inferior
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# should exit the signal trampoline halting at the breakpoint that
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# replaced the fault instruction.
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cont_out "cont"
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cont_out "cont bp after segv" "*[before_segv]"
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cont_out "cont bp before and after segv" "*[before_segv]" "*[after_segv]"
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