118 lines
4 KiB
Text
118 lines
4 KiB
Text
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# This testcase is part of GDB, the GNU debugger.
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# Copyright 2004 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 2 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, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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# Check that GDB can trigger and backtrace SIGSEGV signal stacks
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# caused by both accessing (data) and executing (code) at address
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# zero.
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# On function descriptor architectures, a zero descriptor, instead of
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# a NULL pointer, is used. That way the NULL code test always
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# contains a zero code reference.
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# For recovery, sigjmp/longjmp are used.
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# This also tests backtrace/gdb1476.
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if $tracelevel {
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strace $tracelevel
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}
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set prms_id 0
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set bug_id 0
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set testfile "signull"
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set srcfile ${testfile}.c
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set binfile ${objdir}/${subdir}/${testfile}
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if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
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gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
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}
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gdb_exit
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gdb_start
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gdb_reinitialize_dir $srcdir/$subdir
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gdb_load ${binfile}
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#
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# Run to `main' where we begin our tests.
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#
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if ![runto_main] then {
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gdb_suppress_tests
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}
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# If we can examine what's at memory address 0, it is possible that we
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# could also execute it. This could probably make us run away,
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# executing random code, which could have all sorts of ill effects,
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# especially on targets without an MMU. Don't run the tests in that
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# case.
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send_gdb "x 0\n"
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gdb_expect {
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-re "0x0:.*Cannot access memory at address 0x0.*$gdb_prompt $" { }
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-re "0x0:.*Error accessing memory address 0x0.*$gdb_prompt $" { }
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-re ".*$gdb_prompt $" {
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untested "Memory at address 0 is possibly executable"
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return
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}
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}
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# If an attempt to call a NULL pointer leaves the inferior in main,
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# then function pointers are descriptors, probe this and remember the
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# result.
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gdb_test "set test = code_entry_point" "" "set for function pointer probe"
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set test "probe function pointer"
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set function_pointer code_entry_point
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gdb_test_multiple "continue" "$test" {
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-re "Program received signal SIGSEGV.* bowler .$gdb_prompt $" {
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set function_pointer code_descriptor
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pass "$test (function descriptor)"
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}
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-re "Program received signal SIGSEGV.*0.*$gdb_prompt $" {
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pass "$test (function entry-point)"
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}
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}
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# Re-start from scratch, breakpoint the bowler so that control is
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# regained after each test, and run up to that.
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rerun_to_main
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gdb_test "break bowler"
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gdb_test "break keeper"
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# By default Stop:Yes Print:Yes Pass:Yes
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gdb_test "handle SIGSEGV" "SIGSEGV.*Yes.*Yes.*Yes.*Segmentation fault"
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# For the given signal type, check that: the SIGSEGV occures; a
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# backtrace from the SEGV works; the sigsegv is delivered; a backtrace
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# through the SEGV works.
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proc test_segv { name tag bt_from_segv bt_from_keeper } {
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gdb_test continue "Breakpoint.* bowler.*" "${name} starts with the bowler"
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gdb_test "set test = $tag"
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gdb_test continue "Program received signal SIGSEGV.*" "${name} got SEGV"
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gdb_test backtrace $bt_from_segv "backtrace segv for ${name}"
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gdb_test continue "Breakpoint.* keeper.*" "${name} through to keeper"
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gdb_test backtrace $bt_from_keeper "backtrace keeper for ${name}"
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}
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test_segv data data_pointer \
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{#0 .* bowler .*#1 .* main .*} \
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{#0 .* keeper .*#1 .* handler .*#2 .* bowler .*#3 .* main .*}
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test_segv code $function_pointer \
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{#0 .* 0x0+ .*#1 .* bowler .*#2 .* main .*} \
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{#0 .* keeper .*#1 .* handler .*#2 .* 0x0+ .*#3 .* bowler .*#4 .* main .*}
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