gdb/testsuite/gdb.base/sigstep.exp - native_client/nacl-gdb - Git at Google

 # Copyright 2004-2013 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 {[prepare_for_testing $testfile.exp $testfile $srcfile debug]} {
     untested $testfile.exp
     return -1
 }

 gdb_test "display/i \$pc"

 # Advance to main
 if { ![runto_main] } then {
     gdb_suppress_tests
 }

 # 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.
 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 "
 }

 proc advance { i } {
     global gdb_prompt inferior_exited_re
     set prefix "$i from handler"

     # Get us back into the handler
     gdb_test "continue" ".* handler .*" "$prefix; continue to handler"

     set test "$prefix; leave handler"
     gdb_test_multiple "$i" "${test}" {
 	-re "Could not insert single-step breakpoint.*$gdb_prompt $" {
 	    setup_kfail gdb/1736 "sparc*-*-openbsd*"
 	    fail "$test (could not insert single-step breakpoint)"
 	}
 	-re "done = 1;.*${gdb_prompt} $" {
 	    send_gdb "$i\n"
 	    exp_continue -continue_timer
 	}
 	-re "\} .. handler .*${gdb_prompt} $" {
 	    send_gdb "$i\n"
 	    exp_continue -continue_timer
 	}
 	-re "$inferior_exited_re normally.*${gdb_prompt} $" {
 	    setup_kfail gdb/1639 powerpc-*-*bsd*
 	    fail "$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"
 	}
     }
 }

 proc advancei { i } {
     global gdb_prompt inferior_exited_re
     set prefix "$i from handleri"
     set program_exited 0

     # Get us back into the handler
     gdb_test "continue" ".* handler .*" "$prefix; continue to handler"

     set test "$prefix; leave handler"
     gdb_test_multiple "$i" "${test}" {
         -re "Cannot insert breakpoint 0.*${gdb_prompt} $" {
             # Some platforms use a special read-only page for signal
             # trampolines.  We can't set a breakpoint there, and we
             # don't gracefully fall back to single-stepping.
             setup_kfail gdb/1736 "i?86-*-linux*"
 	    setup_kfail gdb/1736 "*-*-openbsd*"
             fail "$test (could not set breakpoint)"
 	    return
         }
 	-re "Could not insert single-step breakpoint.*$gdb_prompt $" {
 	    setup_kfail gdb/1736 "sparc*-*-openbsd*"
 	    fail "$test (could not insert single-step breakpoint)"
 	}
 	-re "Breakpoint \[0-9\]*, handler .*${gdb_prompt} $" {
 	    fail "$test (hit breakpoint again)"
 	}
 	-re "done = 1;.*${gdb_prompt} $" {
 	    send_gdb "$i\n"
 	    exp_continue -continue_timer
 	}
 	-re "\} .. handler .*${gdb_prompt} $" {
 	    send_gdb "$i\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 "$prefix; leave signal trampoline"
     gdb_test_multiple "$i" "${test}" {
 	-re "while .*${gdb_prompt} $" {
 	    pass "$test (in main)"
 	}
 	-re "signal handler called.*${gdb_prompt} $" {
 	    send_gdb "$i\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} $" {
 	    kfail gdb/1639 "$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/next our way out of a signal handler.

 advance step
 advancei stepi

 advance next
 advancei nexti

 advancei finish
 advancei return
 gdb_test_no_output "set done = 1" "Set done as return will have skipped it"


 # 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.

 # Use the real-time itimer, as otherwize the process never gets enough
 # time to expire the timer.

 delete_breakpoints
 set infinite_loop [gdb_get_line_number {while (!done)}]
 gdb_test_no_output "set itimer = itimer_real"
 gdb_test "break [gdb_get_line_number {done = 0}]"

 # Try stepping when there's a signal pending, and a breakpoint at the
 # handler.  Should step into the signal handler.

 proc skip_to_handler { i } {
     global gdb_prompt
     global infinite_loop
     set prefix "$i to handler"

     # Run around to the done
     # You can add more patterns to this if you need them.
     set test "$prefix; resync"
     gdb_test_multiple "continue" "$test" {
 	-re "done = 0.*$gdb_prompt " {
 	    pass "$test"
 	}
     }

     # Advance to the infinite loop
     gdb_test "advance $infinite_loop" ".*" "$prefix; advance to infinite loop"

     # Make the signal pending
     sleep 1

     # Insert / remove the handler breakpoint.
     gdb_test "break handler" ".*" "$prefix; break handler"
     gdb_test "$i" " handler .*" "$prefix; performing $i"
     gdb_test "clear handler" ".*" "$prefix; clear handler"
 }

 skip_to_handler step
 skip_to_handler next
 skip_to_handler continue

 # 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 { i } {
     global gdb_prompt
     global infinite_loop
     set prefix "$i to handler entry"

     # Run around to the done
     # You can add more patterns to this if you need them.
     set test "$prefix; resync"
     gdb_test_multiple "continue" "$test" {
 	-re "done = 0.*$gdb_prompt " {
 	    pass "$test"
 	}
     }

     # Advance to the infinite loop
     gdb_test "advance $infinite_loop" ".*" "$prefix; advance to infinite loop"

     # Make the signal pending
     sleep 1

     # Insert / remove the handler breakpoint.
     gdb_test "break *handler" ".*" "$prefix; break handler"
     gdb_test "$i" " handler .*" "$prefix; performing $i"
     gdb_test "clear *handler" ".*" "$prefix; clear handler"
 }

 skip_to_handler_entry step
 skip_to_handler_entry next
 skip_to_handler_entry continue

 # Try stepping when there's a signal pending but no breakpoints.
 # Should skip the handler advancing to the next line.

 proc skip_over_handler { i } {
     global gdb_prompt
     global infinite_loop
     set prefix "$i over handler"

     # Run around to the done
     # You can add more patterns to this if you need them.
     set test "$prefix; resync"
     gdb_test_multiple "continue" "$test" {
 	-re "done = 0.*$gdb_prompt " {
 	    pass "$test"
 	}
     }

     # Advance to the infinite loop
     gdb_test "advance $infinite_loop" ".*" "$prefix; advance to infinite loop"

     # Make the signal pending
     sleep 1

     gdb_test "$i" "done = 0.*" "$prefix; performing $i"
 }

 skip_over_handler step
 skip_over_handler next
 skip_over_handler continue

 # 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.

 proc breakpoint_to_handler { i } {
     global gdb_prompt
     global infinite_loop
     set prefix "$i on breakpoint, to handler"

     # Run around to the done
     # You can add more patterns to this if you need them.
     set test "$prefix; resync"
     gdb_test_multiple "continue" "$test" {
 	-re "done = 0.*$gdb_prompt " {
 	    pass "$test"
 	}
     }

     gdb_test "break $infinite_loop" ".*" "$prefix; break infinite loop"
     gdb_test "break handler" ".*" "$prefix; break handler"

     # Continue to the infinite loop
     gdb_test "continue" "while ..done.*" "$prefix; continue to infinite loop"

     # Make the signal pending
     sleep 1

     gdb_test "$i" " handler .*" "$prefix; performing $i"
     gdb_test "clear $infinite_loop" ".*" "$prefix; clear infinite loop"
     gdb_test "clear handler" ".*" "$prefix; clear handler"
 }

 breakpoint_to_handler step
 breakpoint_to_handler next
 breakpoint_to_handler continue

 # 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.

 proc breakpoint_to_handler_entry { i } {
     global gdb_prompt
     global infinite_loop
     set prefix "$i on breakpoint, to handler entry"

     # Run around to the done
     # You can add more patterns to this if you need them.
     set test "$prefix; resync"
     gdb_test_multiple "continue" "$test" {
 	-re "done = 0.*$gdb_prompt " {
 	    pass "$test"
 	}
     }

     gdb_test "break $infinite_loop" ".*" "$prefix; break infinite loop"
     gdb_test "break *handler" ".*" "$prefix; break handler"

     # Continue to the infinite loop
     gdb_test "continue" "while ..done.*" "$prefix; continue to infinite loop"

     # Make the signal pending
     sleep 1

     gdb_test "$i" " handler .*" "$prefix; performing $i"
     gdb_test "clear $infinite_loop" ".*" "$prefix; clear infinite loop"
     gdb_test "clear *handler" ".*" "$prefix; clear handler"
 }

 breakpoint_to_handler_entry step
 breakpoint_to_handler_entry next
 breakpoint_to_handler_entry continue

 # 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.

 proc breakpoint_over_handler { i } {
     global gdb_prompt
     global infinite_loop
     set prefix "$i on breakpoint, skip handler"

     # Run around to the done
     # You can add more patterns to this if you need them.
     set test "$prefix; resync"
     gdb_test_multiple "continue" "$test" {
 	-re "done = 0.*$gdb_prompt " {
 	    pass "$test"
 	}
     }

     gdb_test "break $infinite_loop" ".*" "$prefix; break infinite loop"

     # Continue to the infinite loop
     gdb_test "continue" "while ..done.*" "$prefix; continue to infinite loop"

     # Make the signal pending
     sleep 1

     gdb_test "$i" "done = 0.*" "$prefix; performing $i"
     gdb_test "clear $infinite_loop" ".*" "$prefix; clear infinite loop"
 }

 breakpoint_over_handler step
 breakpoint_over_handler next
 breakpoint_over_handler continue
	# Copyright 2004-2013 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 {[prepare_for_testing $testfile.exp $testfile $srcfile debug]} {
	untested $testfile.exp
	return -1
	}

	gdb_test "display/i \$pc"

	# Advance to main
	if { ![runto_main] } then {
	gdb_suppress_tests
	}

	# 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.
	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 "
	}

	proc advance { i } {
	global gdb_prompt inferior_exited_re
	set prefix "$i from handler"

	# Get us back into the handler
	gdb_test "continue" ".* handler .*" "$prefix; continue to handler"

	set test "$prefix; leave handler"
	gdb_test_multiple "$i" "${test}" {
	-re "Could not insert single-step breakpoint.*$gdb_prompt $" {
	setup_kfail gdb/1736 "sparc--openbsd*"
	fail "$test (could not insert single-step breakpoint)"
	}
	-re "done = 1;.*${gdb_prompt} $" {
	send_gdb "$i\n"
	exp_continue -continue_timer
	}
	-re "\} .. handler .*${gdb_prompt} $" {
	send_gdb "$i\n"
	exp_continue -continue_timer
	}
	-re "$inferior_exited_re normally.*${gdb_prompt} $" {
	setup_kfail gdb/1639 powerpc--bsd*
	fail "$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"
	}
	}
	}

	proc advancei { i } {
	global gdb_prompt inferior_exited_re
	set prefix "$i from handleri"
	set program_exited 0

	# Get us back into the handler
	gdb_test "continue" ".* handler .*" "$prefix; continue to handler"

	set test "$prefix; leave handler"
	gdb_test_multiple "$i" "${test}" {
	-re "Cannot insert breakpoint 0.*${gdb_prompt} $" {
	# Some platforms use a special read-only page for signal
	# trampolines. We can't set a breakpoint there, and we
	# don't gracefully fall back to single-stepping.
	setup_kfail gdb/1736 "i?86--linux"
	setup_kfail gdb/1736 "--openbsd*"
	fail "$test (could not set breakpoint)"
	return
	}
	-re "Could not insert single-step breakpoint.*$gdb_prompt $" {
	setup_kfail gdb/1736 "sparc--openbsd*"
	fail "$test (could not insert single-step breakpoint)"
	}
	-re "Breakpoint \[0-9\], handler .${gdb_prompt} $" {
	fail "$test (hit breakpoint again)"
	}
	-re "done = 1;.*${gdb_prompt} $" {
	send_gdb "$i\n"
	exp_continue -continue_timer
	}
	-re "\} .. handler .*${gdb_prompt} $" {
	send_gdb "$i\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 "$prefix; leave signal trampoline"
	gdb_test_multiple "$i" "${test}" {
	-re "while .*${gdb_prompt} $" {
	pass "$test (in main)"
	}
	-re "signal handler called.*${gdb_prompt} $" {
	send_gdb "$i\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} $" {
	kfail gdb/1639 "$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/next our way out of a signal handler.

	advance step
	advancei stepi

	advance next
	advancei nexti

	advancei finish
	advancei return
	gdb_test_no_output "set done = 1" "Set done as return will have skipped it"


	# 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.

	# Use the real-time itimer, as otherwize the process never gets enough
	# time to expire the timer.

	delete_breakpoints
	set infinite_loop [gdb_get_line_number {while (!done)}]
	gdb_test_no_output "set itimer = itimer_real"
	gdb_test "break [gdb_get_line_number {done = 0}]"

	# Try stepping when there's a signal pending, and a breakpoint at the
	# handler. Should step into the signal handler.

	proc skip_to_handler { i } {
	global gdb_prompt
	global infinite_loop
	set prefix "$i to handler"

	# Run around to the done
	# You can add more patterns to this if you need them.
	set test "$prefix; resync"
	gdb_test_multiple "continue" "$test" {
	-re "done = 0.*$gdb_prompt " {
	pass "$test"
	}
	}

	# Advance to the infinite loop
	gdb_test "advance $infinite_loop" ".*" "$prefix; advance to infinite loop"

	# Make the signal pending
	sleep 1

	# Insert / remove the handler breakpoint.
	gdb_test "break handler" ".*" "$prefix; break handler"
	gdb_test "$i" " handler .*" "$prefix; performing $i"
	gdb_test "clear handler" ".*" "$prefix; clear handler"
	}

	skip_to_handler step
	skip_to_handler next
	skip_to_handler continue

	# 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 { i } {
	global gdb_prompt
	global infinite_loop
	set prefix "$i to handler entry"

	# Run around to the done
	# You can add more patterns to this if you need them.
	set test "$prefix; resync"
	gdb_test_multiple "continue" "$test" {
	-re "done = 0.*$gdb_prompt " {
	pass "$test"
	}
	}

	# Advance to the infinite loop
	gdb_test "advance $infinite_loop" ".*" "$prefix; advance to infinite loop"

	# Make the signal pending
	sleep 1

	# Insert / remove the handler breakpoint.
	gdb_test "break handler" "." "$prefix; break handler"
	gdb_test "$i" " handler .*" "$prefix; performing $i"
	gdb_test "clear handler" "." "$prefix; clear handler"
	}

	skip_to_handler_entry step
	skip_to_handler_entry next
	skip_to_handler_entry continue

	# Try stepping when there's a signal pending but no breakpoints.
	# Should skip the handler advancing to the next line.

	proc skip_over_handler { i } {
	global gdb_prompt
	global infinite_loop
	set prefix "$i over handler"

	# Run around to the done
	# You can add more patterns to this if you need them.
	set test "$prefix; resync"
	gdb_test_multiple "continue" "$test" {
	-re "done = 0.*$gdb_prompt " {
	pass "$test"
	}
	}

	# Advance to the infinite loop
	gdb_test "advance $infinite_loop" ".*" "$prefix; advance to infinite loop"

	# Make the signal pending
	sleep 1

	gdb_test "$i" "done = 0.*" "$prefix; performing $i"
	}

	skip_over_handler step
	skip_over_handler next
	skip_over_handler continue

	# 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.

	proc breakpoint_to_handler { i } {
	global gdb_prompt
	global infinite_loop
	set prefix "$i on breakpoint, to handler"

	# Run around to the done
	# You can add more patterns to this if you need them.
	set test "$prefix; resync"
	gdb_test_multiple "continue" "$test" {
	-re "done = 0.*$gdb_prompt " {
	pass "$test"
	}
	}

	gdb_test "break $infinite_loop" ".*" "$prefix; break infinite loop"
	gdb_test "break handler" ".*" "$prefix; break handler"

	# Continue to the infinite loop
	gdb_test "continue" "while ..done.*" "$prefix; continue to infinite loop"

	# Make the signal pending
	sleep 1

	gdb_test "$i" " handler .*" "$prefix; performing $i"
	gdb_test "clear $infinite_loop" ".*" "$prefix; clear infinite loop"
	gdb_test "clear handler" ".*" "$prefix; clear handler"
	}

	breakpoint_to_handler step
	breakpoint_to_handler next
	breakpoint_to_handler continue

	# 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.

	proc breakpoint_to_handler_entry { i } {
	global gdb_prompt
	global infinite_loop
	set prefix "$i on breakpoint, to handler entry"

	# Run around to the done
	# You can add more patterns to this if you need them.
	set test "$prefix; resync"
	gdb_test_multiple "continue" "$test" {
	-re "done = 0.*$gdb_prompt " {
	pass "$test"
	}
	}

	gdb_test "break $infinite_loop" ".*" "$prefix; break infinite loop"
	gdb_test "break handler" "." "$prefix; break handler"

	# Continue to the infinite loop
	gdb_test "continue" "while ..done.*" "$prefix; continue to infinite loop"

	# Make the signal pending
	sleep 1

	gdb_test "$i" " handler .*" "$prefix; performing $i"
	gdb_test "clear $infinite_loop" ".*" "$prefix; clear infinite loop"
	gdb_test "clear handler" "." "$prefix; clear handler"
	}

	breakpoint_to_handler_entry step
	breakpoint_to_handler_entry next
	breakpoint_to_handler_entry continue

	# 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.

	proc breakpoint_over_handler { i } {
	global gdb_prompt
	global infinite_loop
	set prefix "$i on breakpoint, skip handler"

	# Run around to the done
	# You can add more patterns to this if you need them.
	set test "$prefix; resync"
	gdb_test_multiple "continue" "$test" {
	-re "done = 0.*$gdb_prompt " {
	pass "$test"
	}
	}

	gdb_test "break $infinite_loop" ".*" "$prefix; break infinite loop"

	# Continue to the infinite loop
	gdb_test "continue" "while ..done.*" "$prefix; continue to infinite loop"

	# Make the signal pending
	sleep 1

	gdb_test "$i" "done = 0.*" "$prefix; performing $i"
	gdb_test "clear $infinite_loop" ".*" "$prefix; clear infinite loop"
	}

	breakpoint_over_handler step
	breakpoint_over_handler next
	breakpoint_over_handler continue