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2004-07-06 Andrew Cagney <cagney@gnu.org>
* gdb.base/sigbpt.exp, gdb.base/sigbpt.c: New test.
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Andrew Cagney
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commit
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@ -1,3 +1,7 @@
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2004-07-06 Andrew Cagney <cagney@gnu.org>
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* gdb.base/sigbpt.exp, gdb.base/sigbpt.c: New test.
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2004-07-02 Michael Chastain <mec.gnu@mindspring.com>
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* lib/compiler.c: Accept __HP_CXD_SPP for old hp ansi c compiler.
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53
gdb/testsuite/gdb.base/sigbpt.c
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53
gdb/testsuite/gdb.base/sigbpt.c
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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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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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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
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02111-1307, USA. */
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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extern void
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keeper (int sig)
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{
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}
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volatile long v1 = 0;
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volatile long v2 = 0;
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volatile long v3 = 0;
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extern long
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bowler (void)
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{
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/* Try to read address zero. Do it in a slightly convoluted way so
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that more than one instruction is used. */
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return *(char *) (v1 + v2 + v3);
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}
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int
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main ()
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{
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static volatile int i;
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struct sigaction act;
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memset (&act, 0, sizeof act);
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act.sa_handler = keeper;
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sigaction (SIGSEGV, &act, NULL);
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bowler ();
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return 0;
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}
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263
gdb/testsuite/gdb.base/sigbpt.exp
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263
gdb/testsuite/gdb.base/sigbpt.exp
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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 and only executes single instructions when
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# stepping through a sequence of breakpoints interleaved by a signal
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# handler.
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# This test is known to tickle the following problems: kernel letting
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# the inferior execute both the system call, and the instruction
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# following, when single-stepping a system call; kernel failing to
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# propogate the single-step state when single-stepping the sigreturn
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# system call, instead resuming the inferior at full speed; GDB
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# doesn't know how to software single-step across a sigreturn
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# instruction. Since the kernel problems can be "fixed" using
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# software single-step this is KFAILed rather than XFAILed.
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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 "sigbpt"
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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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gdb_test "break keeper"
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# Run to bowler, and then single step until there's a SIGSEGV. Record
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# the address of each single-step instruction (up to and including the
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# instruction that causes the SIGSEGV) in bowler_addrs, and the address
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# of the actual SIGSEGV in segv_addr.
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set bowler_addrs bowler
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gdb_test {display/i $pc}
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gdb_test "advance *bowler" "bowler.*" "advance to the bowler"
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set test "stepping to SIGSEGV"
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gdb_test_multiple "stepi" "$test" {
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-re "Program received signal SIGSEGV.*pc *(0x\[0-9a-f\]*).*$gdb_prompt $" {
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set segv_addr $expect_out(1,string)
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pass "$test"
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}
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-re " .*pc *(0x\[0-9a-f\]*).*bowler.*$gdb_prompt $" {
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set bowler_addrs [concat $expect_out(1,string) $bowler_addrs]
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send_gdb "stepi\n"
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exp_continue
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}
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}
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# Now record the address of the instruction following the faulting
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# instruction in bowler_addrs.
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set test "get insn after fault"
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gdb_test_multiple {x/2i $pc} "$test" {
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-re "(0x\[0-9a-f\]*).*bowler.*(0x\[0-9a-f\]*).*bowler.*$gdb_prompt $" {
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set bowler_addrs [concat $expect_out(2,string) $bowler_addrs]
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pass "$test"
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}
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}
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# Procedures for returning the address of the instruction before, at
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# and after, the faulting instruction.
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proc before_segv { } {
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global bowler_addrs
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return [lindex $bowler_addrs 2]
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}
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proc at_segv { } {
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global bowler_addrs
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return [lindex $bowler_addrs 1]
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}
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proc after_segv { } {
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global bowler_addrs
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return [lindex $bowler_addrs 0]
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}
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# Check that the address table and SIGSEGV correspond.
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set test "Verify that SIGSEGV occurs at the last STEPI insn"
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if {[string compare $segv_addr [at_segv]] == 0} {
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pass "$test"
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} else {
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fail "$test ($segv_addr [at_segv])"
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}
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# Check that the inferior is correctly single stepped all the way back
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# to a faulting instruction.
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proc stepi_out { name args } {
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global gdb_prompt
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# Set SIGSEGV to pass+nostop and then run the inferior all the way
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# through to the signal handler. With the handler is reached,
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# disable SIGSEGV, ensuring that further signals stop the
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# inferior. Stops a SIGSEGV infinite loop when a broke system
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# keeps re-executing the faulting instruction.
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rerun_to_main
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gdb_test "handle SIGSEGV nostop print pass" "" "pass SIGSEGV; $name"
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gdb_test "continue" "keeper.*" "continue to keeper; $name"
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gdb_test "handle SIGSEGV stop print nopass" "" "nopass SIGSEGV; $name"
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# Insert all the breakpoints. To avoid the need to step over
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# these instructions, this is delayed until after the keeper has
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# been reached.
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for {set i 0} {$i < [llength $args]} {incr i} {
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gdb_test "break [lindex $args $i]" "Breakpoint.*" \
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"set breakpoint $i of [llength $args]; $name"
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}
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# Single step our way out of the keeper, through the signal
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# trampoline, and back to the instruction that faulted.
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set test "stepi out of handler; $name"
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gdb_test_multiple "stepi" "$test" {
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-re "keeper.*$gdb_prompt $" {
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send_gdb "stepi\n"
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exp_continue
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}
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-re "signal handler.*$gdb_prompt $" {
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send_gdb "stepi\n"
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exp_continue
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}
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-re "Program received signal SIGSEGV.*$gdb_prompt $" {
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kfail gdb/1702 "$test (executed fault insn)"
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}
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-re "Breakpoint.*pc *[at_segv] .*bowler.*$gdb_prompt $" {
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pass "$test (at breakpoint)"
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}
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-re "Breakpoint.*pc *[after_segv] .*bowler.*$gdb_prompt $" {
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kfail gdb/1702 "$test (executed breakpoint)"
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}
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-re "pc *[at_segv] .*bowler.*$gdb_prompt $" {
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pass "$test"
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}
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-re "pc *[after_segv] .*bowler.*$gdb_prompt $" {
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kfail gdb/1702 "$test (skipped fault insn)"
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}
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}
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# Clear any breakpoints
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for {set i 0} {$i < [llength $args]} {incr i} {
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gdb_test "clear [lindex $args $i]" "Deleted .*" \
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"clear breakpoint $i of [llength $args]; $name"
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}
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}
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# Let a signal handler exit, returning to a breakpoint instruction
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# inserted at the original fault instruction. Check that the
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# breakpoint is hit, and that single stepping off that breakpoint
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# executes the underlying fault instruction causing a SIGSEGV.
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proc cont_out { name args } {
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global gdb_prompt
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# Set SIGSEGV to pass+nostop and then run the inferior all the way
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# through to the signal handler. With the handler is reached,
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# disable SIGSEGV, ensuring that further signals stop the
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# inferior. Stops a SIGSEGV infinite loop when a broke system
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# keeps re-executing the faulting instruction.
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rerun_to_main
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gdb_test "handle SIGSEGV nostop print pass" "" "pass SIGSEGV; $name"
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gdb_test "continue" "keeper.*" "continue to keeper; $name"
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gdb_test "handle SIGSEGV stop print nopass" "" "nopass SIGSEGV; $name"
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# Insert all the breakpoints. To avoid the need to step over
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# these instructions, this is delayed until after the keeper has
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# been reached. Always set a breakpoint at the signal trampoline
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# instruction.
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set args [concat $args "*[at_segv]"]
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for {set i 0} {$i < [llength $args]} {incr i} {
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gdb_test "break [lindex $args $i]" "Breakpoint.*" \
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"set breakpoint $i of [llength $args]; $name"
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}
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# Let the handler return, it should "appear to hit" the breakpoint
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# inserted at the faulting instruction. Note that the breakpoint
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# instruction wasn't executed, rather the inferior was SIGTRAPed
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# with the PC at the breakpoint.
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gdb_test "continue" "Breakpoint.*pc *[at_segv] .*" \
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"continue to breakpoint at fault; $name"
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# Now single step the faulted instrction at that breakpoint.
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gdb_test "stepi" \
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"Program received signal SIGSEGV.*pc *[at_segv] .*" \
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"stepi fault; $name"
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# Clear any breakpoints
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for {set i 0} {$i < [llength $args]} {incr i} {
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gdb_test "clear [lindex $args $i]" "Deleted .*" \
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"clear breakpoint $i of [llength $args]; $name"
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}
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}
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# Try to confuse DECR_PC_AFTER_BREAK architectures by scattering
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# breakpoints around the faulting address. In all cases the inferior
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# should single-step out of the signal trampoline halting (but not
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# executing) the fault instruction.
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stepi_out "stepi"
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stepi_out "stepi bp before segv" "*[before_segv]"
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stepi_out "stepi bp at segv" "*[at_segv]"
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stepi_out "stepi bp before and at segv" "*[at_segv]" "*[before_segv]"
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# Try to confuse DECR_PC_AFTER_BREAK architectures by scattering
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# breakpoints around the faulting address. In all cases the inferior
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# should exit the signal trampoline halting at the breakpoint that
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# replaced the fault instruction.
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cont_out "cont"
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cont_out "cont bp after segv" "*[before_segv]"
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cont_out "cont bp before and after segv" "*[before_segv]" "*[after_segv]"
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