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# This testcase is part of GDB, the GNU debugger.

# Copyright 2004, 2005, 2007, 2008 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 .

# Check that GDB can trigger and backtrace SIGSEGV signal stacks

# caused by both accessing (data) and executing (code) at address

# zero.

# On function descriptor architectures, a zero descriptor, instead of

# a NULL pointer, is used.  That way the NULL code test always

# contains a zero code reference.

# For recovery, sigjmp/longjmp are used.

# This also tests backtrace/gdb1476.

if [target_info exists gdb,nosignals] {

    verbose "Skipping signull.exp because of nosignals."

    continue

}

if $tracelevel {

    strace $tracelevel

}

set prms_id 0

set bug_id 0

set testfile "signull"

set srcfile ${testfile}.c

set binfile ${objdir}/${subdir}/${testfile}

if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {

    untested signull.exp

    return -1

}

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

#

# Run to `main' where we begin our tests.

#

if ![runto_main] then {

    gdb_suppress_tests

}

# If we can examine what's at memory address 0, it is possible that we

# could also execute it.  This could probably make us run away,

# executing random code, which could have all sorts of ill effects,

# especially on targets without an MMU.  Don't run the tests in that

# case.

send_gdb "x 0\n"

gdb_expect {

    -re "0x0:.*Cannot access memory at address 0x0.*$gdb_prompt $" { }

    -re "0x0:.*Error accessing memory address 0x0.*$gdb_prompt $" { }

    -re ".*$gdb_prompt $" {

        untested "Memory at address 0 is possibly executable"

        return

    }

}

# If an attempt to call a NULL pointer leaves the inferior in main,

# then function pointers are descriptors, probe this and remember the

# result.

gdb_test "set test = code_entry_point" "" "set for function pointer probe"

set test "probe function pointer"

set function_pointer code_entry_point

gdb_test_multiple "continue" "$test" {

    -re "Program received signal SIGSEGV.*bowler .*$gdb_prompt $" {

        set function_pointer code_descriptor

        pass "$test (function descriptor)"

    }

    -re "Program received signal SIGSEGV.*0.*$gdb_prompt $" {

        pass "$test (function entry-point)"

    }

}

# Re-start from scratch, breakpoint the bowler so that control is

# regained after each test, and run up to that.

rerun_to_main

gdb_test "break bowler"

gdb_test "break keeper"

# By default Stop:Yes Print:Yes Pass:Yes

gdb_test "handle SIGSEGV" "SIGSEGV.*Yes.*Yes.*Yes.*Segmentation fault"

# For the given signal type, check that: the SIGSEGV occures; a

# backtrace from the SEGV works; the sigsegv is delivered; a backtrace

# through the SEGV works.

proc test_segv { name tag bt_from_segv bt_from_keeper } {

    gdb_test continue "Breakpoint.* bowler.*" "${name}; start with the bowler"

    # NB: Don't use $tag in the testname - changes across systems.

    gdb_test "set test = $tag" "" "${name}; select the pointer type"

    gdb_test continue "Program received signal SIGSEGV.*" \

        "${name}; take the SIGSEGV"

    gdb_test backtrace $bt_from_segv "${name}; backtrace from SIGSEGV"

    gdb_test continue "Breakpoint.* keeper.*" "${name}; continue to the keeper"

    gdb_test backtrace $bt_from_keeper "${name}; backtrace from keeper through SIGSEGV"

}

test_segv "data read" data_read \

    {#0 .* bowler .*#1  .* main .*} \

    {#0 .* keeper .*#1  .* handler .*#2 .* bowler .*#3  .* main .*}

test_segv "data write" data_write \

    {#0 .* bowler .*#1  .* main .*} \

    {#0 .* keeper .*#1  .* handler .*#2 .* bowler .*#3  .* main .*}

test_segv code $function_pointer \

    {#0 .* 0x0+ .*#1 .* bowler .*#2  .* main .*} \

    {#0 .* keeper .*#1  .* handler .*#2 .* 0x0+ .*#3 .* bowler .*#4 .* main .*}