binutils-gdb/gdb/testsuite/gdb.base/catch-syscall.exp

#   Copyright 1997-2013 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/>.


# This program tests the 'catch syscall' functionality.
#
# It was written by Sergio Durigan Junior <sergiodj@linux.vnet.ibm.com>
# on September/2008.

if { [is_remote target] || ![isnative] } then {
    continue
}

# Until "catch syscall" is implemented on other targets...
if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-linux*"]} then {
    continue
}

# This shall be updated whenever 'catch syscall' is implemented
# on some architecture.
#if { ![istarget "i\[34567\]86-*-linux*"]
if { ![istarget "x86_64-*-linux*"] && ![istarget "i\[34567\]86-*-linux*"]
     && ![istarget "powerpc-*-linux*"] && ![istarget "powerpc64-*-linux*"]
     && ![istarget "sparc-*-linux*"] && ![istarget "sparc64-*-linux*"]
     && ![istarget "mips*-linux*"] && ![istarget "arm*-linux*"] } {
     continue
}

standard_testfile

# All (but the last) syscalls from the example code
# They are ordered according to the file, so do not change this.
set all_syscalls { "close" "chroot" }
set all_syscalls_numbers { }
# The last syscall (exit()) does not return, so
# we cannot expect the catchpoint to be triggered
# twice.  It is a special case.
set last_syscall "exit_group"

if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
     untested catch-syscall.exp
     return -1
}

# Internal procedure used to check if, after issuing a 'catch syscall'
# command (without arguments), the 'info breakpoints' command displays
# that '"any syscall"' is to be caught.
proc check_info_bp_any_syscall {} {
    global gdb_prompt

    # Verifying that the catchpoint appears in the 'info breakpoints'
    # command, but with "<any syscall>".
    set thistest "catch syscall appears in 'info breakpoints'"
    gdb_test "info breakpoints" ".*catchpoint.*keep y.*syscall \"<any syscall>\".*" $thistest
}

# Internal procedure used to check if, after issuing a 'catch syscall X'
# command (with arguments), the 'info breakpoints' command displays
# that the syscall 'X' is to be caught.
proc check_info_bp_specific_syscall { syscall } {
    global gdb_prompt

    set thistest "syscall(s) $syscall appears in 'info breakpoints'"
    gdb_test "info breakpoints" ".*catchpoint.*keep y.*syscall(\[(\]s\[)\])? (.)?${syscall}(.)?.*" $thistest
}

# Internal procedure used to check if, after issuing a 'catch syscall X'
# command (with many arguments), the 'info breakpoints' command displays
# that the syscalls 'X' are to be caught.
proc check_info_bp_many_syscalls { syscalls } {
    global gdb_prompt
    set filter_str ""

    foreach name $syscalls {
      set filter_str "${filter_str}${name}, "
    }

    set filter_str [ string trimright $filter_str ", " ]

    set thistest "syscalls $filter_str appears in 'info breakpoints'"
    gdb_test "info breakpoints" ".*catchpoint.*keep y.*syscalls (.)?${filter_str}(.)?.*" $thistest
}

# This procedure checks if there was a call to a syscall.
proc check_call_to_syscall { syscall } {
    global gdb_prompt

    set thistest "program has called $syscall"
    gdb_test "continue" "Catchpoint .*(call to syscall .?${syscall}.?).*" $thistest
}

# This procedure checks if the syscall returned.
proc check_return_from_syscall { syscall } {
    global gdb_prompt

    set thistest "syscall $syscall has returned"
    gdb_test "continue" "Catchpoint .*(returned from syscall (.)?${syscall}(.)?).*" $thistest
}

# Internal procedure that performs two 'continue' commands and checks if
# a syscall call AND return occur.
proc check_continue { syscall } {
    global gdb_prompt

    # Testing if the 'continue' stops at the
    # specified syscall_name.  If it does, then it should
    # first print that the infeior has called the syscall,
    # and after print that the syscall has returned.

    # Testing if the inferiorr has called the syscall.
    check_call_to_syscall $syscall
    # And now, that the syscall has returned.
    check_return_from_syscall $syscall
}

# Inserts a syscall catchpoint with an argument.
proc insert_catch_syscall_with_arg { syscall } {
    global gdb_prompt

    # Trying to set the catchpoint
    set thistest "catch syscall with arguments ($syscall)"
    gdb_test "catch syscall $syscall" "Catchpoint .*(syscall (.)?${syscall}(.)?( \[\[0-9\]+\])?).*" $thistest

    check_info_bp_specific_syscall $syscall
}

# Inserts a syscall catchpoint with many arguments.
proc insert_catch_syscall_with_many_args { syscalls numbers } {
    global gdb_prompt
    set catch [ join $syscalls " " ]
    set filter_str ""

    foreach name $syscalls number $numbers {
      set filter_str "${filter_str}'${name}' \[${number}\] "
    }

    set filter_str [ string trimright $filter_str " " ]

    # Trying to set the catchpoint
    set thistest "catch syscall with arguments ($filter_str)"
    gdb_test "catch syscall $catch" "Catchpoint .*(syscalls (.)?${filter_str}(.)?).*" $thistest

    check_info_bp_many_syscalls $syscalls
}

proc check_for_program_end {} {
    global gdb_prompt

    # Deleting the catchpoints
    delete_breakpoints

    gdb_continue_to_end

}

proc test_catch_syscall_without_args {} {
    global gdb_prompt all_syscalls last_syscall

    with_test_prefix "without arguments" {
	# Trying to set the syscall.
	gdb_test "catch syscall" "Catchpoint .*(syscall).*"

	check_info_bp_any_syscall

	# We have to check every syscall.
	foreach name $all_syscalls {
	    check_continue $name
	}

	# At last but not least, we check if the inferior has called
	# the last (exit) syscall.
	check_call_to_syscall $last_syscall

	# Now let's see if the inferior correctly finishes.
	check_for_program_end
    }
}

proc test_catch_syscall_with_args {} {
    with_test_prefix "with arguments" {
	global gdb_prompt

	set syscall_name "close"
	insert_catch_syscall_with_arg $syscall_name

	# Can we continue until we catch the syscall?
	check_continue $syscall_name

	# Now let's see if the inferior correctly finishes.
	check_for_program_end
    }
}

proc test_catch_syscall_with_many_args {} {
    with_test_prefix "with many arguments" {
	global gdb_prompt all_syscalls all_syscalls_numbers

	insert_catch_syscall_with_many_args $all_syscalls $all_syscalls_numbers

	# Can we continue until we catch the syscalls?
	foreach name $all_syscalls {
	    check_continue $name
	}

	# Now let's see if the inferior correctly finishes.
	check_for_program_end
    }
}

proc test_catch_syscall_with_wrong_args {} {
    with_test_prefix "wrong args" {
	global gdb_prompt

	# mlock is not called from the source
	set syscall_name "mlock"
	insert_catch_syscall_with_arg $syscall_name

	# Now, we must verify if the program stops with a continue.
	# If it doesn't, everything is right (since we don't have
	# a syscall named "mlock" in it).  Otherwise, this is a failure.
	set thistest "catch syscall with unused syscall ($syscall_name)"
	gdb_continue_to_end $thistest
    }
}

proc test_catch_syscall_restarting_inferior {} {
    with_test_prefix "restarting inferior" {
	global gdb_prompt

	set syscall_name "chroot"

	with_test_prefix "entry" {
	    insert_catch_syscall_with_arg $syscall_name

	    # Let's first reach the entry of the syscall.
	    check_call_to_syscall $syscall_name
	}

	with_test_prefix "entry/return" {
	    # Now, restart the program.
	    rerun_to_main

	    # And check for entry/return.
	    check_continue $syscall_name

	    # Can we finish?
	    check_for_program_end
	}
    }
}

proc test_catch_syscall_fail_nodatadir {} {
    with_test_prefix "fail no datadir" {
	global gdb_prompt

	# Sanitizing.
	delete_breakpoints

	# Make sure GDB doesn't load the syscalls xml from the system
	# data directory.
	gdb_test_no_output "set data-directory /the/path/to/nowhere"

	# Testing to see if we receive a warning when calling "catch
	# syscall" without XML support (without datadir).
	set thistest "catch syscall displays a warning when there is no XML support"
	gdb_test "catch syscall" \
	    "warning: Could not load the syscall XML file.*warning: GDB will not be able to display syscall names nor to verify if.*any provided syscall numbers are valid.*Catchpoint .*(syscall).*" \
	    $thistest

	# Since the catchpoint was set, we must check if it's present
	# in "info breakpoints" output.
	check_info_bp_any_syscall

	# Sanitizing.
	delete_breakpoints
    }
}

proc do_syscall_tests {} {
    global gdb_prompt srcdir

    # NOTE: We don't have to point gdb at the correct data-directory.
    # For the build tree that is handled by INTERNAL_GDBFLAGS.

    # Verify that the 'catch syscall' help is available
    set thistest "help catch syscall"
    gdb_test "help catch syscall" "Catch system calls.*" $thistest

    # Try to set a catchpoint to a nonsense syscall
    set thistest "catch syscall to a nonsense syscall is prohibited"
    gdb_test "catch syscall nonsense_syscall" "Unknown syscall name .*" $thistest

    # Regression test for syscall completer bug.
    gdb_test "complete catch syscall close chroo" \
	"catch syscall close chroot" \
	"complete catch syscall with multiple words"

    # Testing the 'catch syscall' command without arguments.
    # This test should catch any syscalls.
    if [runto_main] then { test_catch_syscall_without_args }

    # Testing the 'catch syscall' command with arguments.
    # This test should only catch the specified syscall.
    if [runto_main] then { test_catch_syscall_with_args }

    # Testing the 'catch syscall' command with many arguments.
    # This test should catch $all_syscalls.
    if [runto_main] then { test_catch_syscall_with_many_args }

    # Testing the 'catch syscall' command with WRONG arguments.
    # This test should not trigger any catchpoints.
    if [runto_main] then { test_catch_syscall_with_wrong_args }

    # Testing the 'catch' syscall command during a restart of
    # the inferior.
    if [runto_main] then { test_catch_syscall_restarting_inferior }
}

proc test_catch_syscall_without_args_noxml {} {
    with_test_prefix "without args noxml" {
	# We will need the syscall names even not using it because we
	# need to know know many syscalls are in the example file.
	global gdb_prompt all_syscalls last_syscall

	delete_breakpoints

	gdb_test "catch syscall" "Catchpoint .*(syscall).*"

	# Now, we should be able to set a catchpoint, and GDB shall
	# not display the warning anymore.
	foreach name $all_syscalls {
	    # Unfortunately, we don't know the syscall number that
	    # will be caught because this information is
	    # arch-dependent.  Thus, we try to catch anything similar
	    # to a number.
	    with_test_prefix "$name" {
		check_continue "\[0-9\]*"
	    }
	}

	# At last but not least, we check if the inferior has called
	# the last (exit) syscall.
	check_call_to_syscall "\[0-9\]*"

	delete_breakpoints
    }
}

proc test_catch_syscall_with_args_noxml {} {
    with_test_prefix "with args noxml" {
	global gdb_prompt

	# The number of the "close" syscall.  This is our option for a
	# "long-estabilished" syscall in all Linux architectures, but
	# unfortunately x86_64 and a few other platforms don't "follow
	# the convention".  Because of this, we need this ugly check
	# :-(.
	set close_number ""
	if { [istarget "x86_64-*-linux*"] } {
	    set close_number "3"
	} else {
	    set close_number "6"
	}

	delete_breakpoints

	insert_catch_syscall_with_arg $close_number

	check_continue $close_number

	delete_breakpoints
    }
}

proc test_catch_syscall_with_wrong_args_noxml {} {
    with_test_prefix "with wrong args noxml" {
	global gdb_prompt

	delete_breakpoints

	# Even without XML support, GDB should not accept unknown
	# syscall names for the catchpoint.
	gdb_test "catch syscall nonsense_syscall" \
	    "Unknown syscall name .nonsense_syscall.*"

	delete_breakpoints
    }
}

proc do_syscall_tests_without_xml {} {
    global gdb_prompt srcdir

    # Make sure GDB doesn't load the syscalls xml from the system data
    # directory.
    gdb_test_no_output "set data-directory /the/path/to/nowhere"

    # Let's test if we can catch syscalls without XML support.
    # We should succeed, but GDB is not supposed to print syscall names.
    if [runto_main] then { test_catch_syscall_without_args_noxml }

    # The only valid argument "catch syscall" should accept is the
    # syscall number, and not the name (since it can't translate a
    # name to a number).
    #
    # It's worth mentioning that we only try to catch the syscall
    # close().  This is because the syscall number is an arch-dependent
    # information, so we can't assume that we know every syscall number
    # in this system.  Therefore, we have decided to use a "long-estabilished"
    # system call, and close() just sounded the right choice :-).
    if [runto_main] then { test_catch_syscall_with_args_noxml }

    # Now, we'll try to provide a syscall name (valid or not) to the command,
    # and expect it to fail.
    if [runto_main] then { test_catch_syscall_with_wrong_args_noxml }
}

# This procedure fills the vector "all_syscalls_numbers" with the proper
# numbers for the used syscalls according to the architecture.
proc fill_all_syscalls_numbers {} {
    global all_syscalls_numbers

    # For Linux on x86, PPC, PPC64, SPARC, SPARC64 and ARM,
    # the numbers for the syscalls "close" and "chroot" are the same.
    if { [istarget "i\[34567\]86-*-linux*"]
         || [istarget "powerpc-*-linux*"] || [istarget "powerpc64-*-linux*"]
         || [istarget "sparc-*-linux*"] || [istarget "sparc64-*-linux*"]
         || [istarget "arm*-linux*"] } {
         set all_syscalls_numbers { "6" "61" }
    }
}

# Start with a fresh gdb

gdb_exit
set do_xml_test ![gdb_skip_xml_test]
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}

# Execute the tests, using XML support
if $do_xml_test {
  do_syscall_tests

  # Now, we have to see if GDB displays a warning when we
  # don't set the data-directory but try to use catch syscall
  # anyway.  For that, we must restart GDB first.
  gdb_exit
  gdb_start
  gdb_reinitialize_dir $srcdir/$subdir
  gdb_load ${binfile}
  test_catch_syscall_fail_nodatadir
}

# Restart gdb

gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}

# Execute the tests, without XML support.  In this case, GDB will
# only display syscall numbers, and not syscall names.
do_syscall_tests_without_xml