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[/] [scarts/] [trunk/] [toolchain/] [scarts-gdb/] [gdb-6.8/] [gdb/] [testsuite/] [gdb.base/] [sigbpt.exp] - Blame information for rev 25

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1 25 jlechner
# This testcase is part of GDB, the GNU debugger.
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# Copyright 2004, 2005, 2007, 2008 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 3 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, see .
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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 [target_info exists gdb,nosignals] {
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    verbose "Skipping sigbpt.exp because of nosignals."
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    continue
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}
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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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    untested sigbpt.exp
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    return -1
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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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set segv_addr none
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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(\r\n| *) *(0x\[0-9a-f\]*).*$gdb_prompt $" {
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        set segv_addr $expect_out(2,string)
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        pass "$test"
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    }
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    -re " .*pc(\r\n| *)(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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        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" "" "${name}; pass SIGSEGV"
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    gdb_test "continue" "keeper.*" "${name}; continue to keeper"
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    gdb_test "handle SIGSEGV stop print nopass" "" "${name}; nopass SIGSEGV"
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    # Insert all the breakpoints.  To avoid the need to step over
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    # these instructions, this is delayed until after the keeper has
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    # been reached.
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    for {set i 0} {$i < [llength $args]} {incr i} {
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        gdb_test "break [lindex $args $i]" "Breakpoint.*" \
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            "${name}; set breakpoint $i of [llength $args]"
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    }
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    # Single step our way out of the keeper, through the signal
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    # trampoline, and back to the instruction that faulted.
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    set test "${name}; stepi out of handler"
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    gdb_test_multiple "stepi" "$test" {
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        -re "Could not insert single-step breakpoint.*$gdb_prompt $" {
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            setup_kfail "sparc*-*-openbsd*" gdb/1736
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            fail "$test (could not insert single-step breakpoint)"
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        }
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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(\r\n| *)[at_segv] .*bowler.*$gdb_prompt $" {
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            pass "$test (at breakpoint)"
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        }
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        -re "Breakpoint.*pc(\r\n| *)[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(\r\n| *)[at_segv] .*bowler.*$gdb_prompt $" {
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            pass "$test"
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        }
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        -re "pc(\r\n| *)[after_segv] .*bowler.*$gdb_prompt $" {
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            kfail gdb/1702 "$test (skipped fault insn)"
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        }
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        -re "pc(\r\n| *)0x\[a-z0-9\]* .*bowler.*$gdb_prompt $" {
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            kfail gdb/1702 "$test (corrupt pc)"
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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 $i]" "Deleted .*" \
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            "${name}; clear breakpoint $i of [llength $args]"
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    }
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}
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# Let a signal handler exit, returning to a breakpoint instruction
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# inserted at the original fault instruction.  Check that the
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# breakpoint is hit, and that single stepping off that breakpoint
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# executes the underlying fault instruction causing a SIGSEGV.
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proc cont_out { name args } {
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    global gdb_prompt
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    # Set SIGSEGV to pass+nostop and then run the inferior all the way
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    # through to the signal handler.  With the handler is reached,
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    # disable SIGSEGV, ensuring that further signals stop the
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    # inferior.  Stops a SIGSEGV infinite loop when a broke system
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    # keeps re-executing the faulting instruction.
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    rerun_to_main
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    gdb_test "handle SIGSEGV nostop print pass" "" "${name}; pass SIGSEGV"
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    gdb_test "continue" "keeper.*" "${name}; continue to keeper"
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    gdb_test "handle SIGSEGV stop print nopass" "" "${name}; nopass SIGSEGV"
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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 $i]" "Breakpoint.*" \
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            "${name}; set breakpoint $i  of [llength $args]"
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    }
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    # Let the handler return, it should "appear to hit" the breakpoint
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    # inserted at the faulting instruction.  Note that the breakpoint
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    # instruction wasn't executed, rather the inferior was SIGTRAPed
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    # with the PC at the breakpoint.
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    gdb_test "continue" "Breakpoint.*pc(\r\n| *)[at_segv] .*" \
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        "${name}; continue to breakpoint at fault"
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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(\r\n| *)[at_segv] .*" \
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        "${name}; stepi fault"
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    # Clear any breakpoints
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    for {set i 0} {$i < [llength $args]} {incr i} {
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        gdb_test "clear [lindex $args $i]" "Deleted .*" \
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            "${name}; clear breakpoint $i of [llength $args]"
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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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