binutils-gdb/gdb/testsuite/gdb.base/sigstep.exp
Pedro Alves 8f572e5c0f Fix gdb.base/sigstep.exp with displaced stepping on software single-step targets
TL;DR:

When stepping over a breakpoint with displaced stepping, the core must
be notified of all signals, otherwise the displaced step fixup code
confuses a breakpoint trap in the signal handler for the expected trap
indicating the displaced instruction was single-stepped
normally/successfully.

Detailed version:

Running sigstep.exp with displaced stepping on, against my x86
software single-step branch, I got:

 FAIL: gdb.base/sigstep.exp: step on breakpoint, to handler: performing step
 FAIL: gdb.base/sigstep.exp: next on breakpoint, to handler: performing next
 FAIL: gdb.base/sigstep.exp: continue on breakpoint, to handler: performing continue

Turning on debug logs, we see:

 (gdb) step
 infrun: clear_proceed_status_thread (process 32147)
 infrun: proceed (addr=0xffffffffffffffff, signal=GDB_SIGNAL_DEFAULT)
 infrun: resume (step=1, signal=GDB_SIGNAL_0), trap_expected=1, current thread [process 32147] at 0x400842
 displaced: stepping process 32147 now
 displaced: saved 0x400622: 49 89 d1 5e 48 89 e2 48 83 e4 f0 50 54 49 c7 c0
 displaced: %rip-relative addressing used.
 displaced: using temp reg 2, old value 0x3615eafd37, new value 0x40084c
 displaced: copy 0x400842->0x400622: c7 81 1c 08 20 00 00 00 00 00
 displaced: displaced pc to 0x400622
 displaced: run 0x400622: c7 81 1c 08
 LLR: Preparing to resume process 32147, 0, inferior_ptid process 32147
 LLR: PTRACE_CONT process 32147, 0 (resume event thread)
 linux_nat_wait: [process -1], [TARGET_WNOHANG]
 LLW: enter
 LNW: waitpid(-1, ...) returned 32147, No child processes
 LLW: waitpid 32147 received Alarm clock (stopped)
 LLW: PTRACE_CONT process 32147, Alarm clock (preempt 'handle')
 LNW: waitpid(-1, ...) returned 0, No child processes
 LLW: exit (ignore)
 sigchld
 infrun: target_wait (-1.0.0, status) =
 infrun:   -1.0.0 [process -1],
 infrun:   status->kind = ignore
 infrun: TARGET_WAITKIND_IGNORE
 infrun: prepare_to_wait
 linux_nat_wait: [process -1], [TARGET_WNOHANG]
 LLW: enter
 LNW: waitpid(-1, ...) returned 32147, No child processes
 LLW: waitpid 32147 received Trace/breakpoint trap (stopped)
 CSBB: process 32147 stopped by software breakpoint
 LNW: waitpid(-1, ...) returned 0, No child processes
 LLW: trap ptid is process 32147.
 LLW: exit
 infrun: target_wait (-1.0.0, status) =
 infrun:   32147.32147.0 [process 32147],
 infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
 infrun: TARGET_WAITKIND_STOPPED
 displaced: restored process 32147 0x400622
 displaced: fixup (0x400842, 0x400622), insn = 0xc7 0x81 ...
 displaced: restoring reg 2 to 0x3615eafd37
 displaced: relocated %rip from 0x400717 to 0x400937
 infrun: stop_pc = 0x400937
 infrun: delayed software breakpoint trap, ignoring
 infrun: no line number info
 infrun: stop_waiting
 0x0000000000400937 in __dso_handle ()
 1: x/i $pc
 => 0x400937:    and    %ah,0xa0d64(%rip)        # 0x4a16a1
 (gdb) FAIL: gdb.base/sigstep.exp: displaced=on: step on breakpoint, to handler: performing step


What should have happened is that the breakpoint hit in the signal
handler should have been presented to the user.  But note that
"preempt 'handle'" -- what happened instead is that
displaced_step_fixup confused the breakpoint in the signal handler for
the expected SIGTRAP indicating the displaced instruction was
single-stepped normally/successfully.

This should be affecting all software single-step targets in the same
way.

The fix is to make sure the core sees all signals when displaced
stepping, just like we already must see all signals when doing an
stepping over a breakpoint in-line.  We now get:

 infrun: target_wait (-1.0.0, status) =
 infrun:   570.570.0 [process 570],
 infrun:   status->kind = stopped, signal = GDB_SIGNAL_ALRM
 infrun: TARGET_WAITKIND_STOPPED
 displaced: restored process 570 0x400622
 infrun: stop_pc = 0x400842
 infrun: random signal (GDB_SIGNAL_ALRM)
 infrun: signal arrived while stepping over breakpoint
 infrun: inserting step-resume breakpoint at 0x400842
 infrun: resume (step=0, signal=GDB_SIGNAL_ALRM), trap_expected=0, current thread [process 570] at 0x400842
 LLR: Preparing to resume process 570, Alarm clock, inferior_ptid process 570
 LLR: PTRACE_CONT process 570, Alarm clock (resume event thread)
 infrun: prepare_to_wait
 linux_nat_wait: [process -1], [TARGET_WNOHANG]
 LLW: enter
 LNW: waitpid(-1, ...) returned 0, No child processes
 LLW: exit (ignore)
 infrun: target_wait (-1.0.0, status) =
 infrun:   -1.0.0 [process -1],
 infrun:   status->kind = ignore
 sigchld
 infrun: TARGET_WAITKIND_IGNORE
 infrun: prepare_to_wait
 linux_nat_wait: [process -1], [TARGET_WNOHANG]
 LLW: enter
 LNW: waitpid(-1, ...) returned 570, No child processes
 LLW: waitpid 570 received Trace/breakpoint trap (stopped)
 CSBB: process 570 stopped by software breakpoint
 LNW: waitpid(-1, ...) returned 0, No child processes
 LLW: trap ptid is process 570.
 LLW: exit
 infrun: target_wait (-1.0.0, status) =
 infrun:   570.570.0 [process 570],
 infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
 infrun: TARGET_WAITKIND_STOPPED
 infrun: stop_pc = 0x400717
 infrun: BPSTAT_WHAT_STOP_NOISY
 infrun: stop_waiting

 Breakpoint 3, handler (sig=14) at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.base/sigstep.c:35
 35        done = 1;

Hardware single-step targets already behave this way, because the
Linux backends (both native and gdbserver) always report signals to
the core if the thread was single-stepping.

As mentioned in the new comment in do_target_resume, we can't fix this
by instead making the displaced_step_fixup phase skip fixing up the PC
if the single step stopped somewhere we didn't expect.  Here's what
the backtrace would look like if we did that:

 Breakpoint 3, handler (sig=14) at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.base/sigstep.c:35
 35        done = 1;
 1: x/i $pc
 => 0x400717 <handler+7>:        movl   $0x1,0x200943(%rip)        # 0x601064 <done>
 (gdb) bt
 #0  handler (sig=14) at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.base/sigstep.c:35
 #1  <signal handler called>
 #2  0x0000000000400622 in _start ()
 (gdb) FAIL: gdb.base/sigstep.exp: displaced=on: step on breakpoint, to handler: backtrace

gdb/ChangeLog:
2015-04-10  Pedro Alves  <palves@redhat.com>

	* infrun.c (displaced_step_in_progress): New function.
	(do_target_resume): Advise target to report all signals if
	displaced stepping.

gdb/testsuite/ChangeLog:
2015-04-10  Pedro Alves  <palves@redhat.com>

	* gdb.base/sigstep.exp (breakpoint_to_handler)
	(breakpoint_to_handler_entry): New parameter 'displaced'.  Use it.
	Test "backtrace" in handler.
	(breakpoint_over_handler): New parameter 'displaced'.  Use it.
	(top level): Add new "displaced" test axis to
	breakpoint_to_handler, breakpoint_to_handler_entry and
	breakpoint_over_handler.
2015-04-10 10:55:09 +01:00

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