binutils-gdb/gdb/testsuite/gdb.base/execl-update-breakpoints.exp

# Copyright 2014 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/>.

# Test that when following an exec, we don't try to insert breakpoints
# in the new image at the addresses the symbols had before the exec.

# Remote protocol does not support follow-exec notifications.

if [is_remote target] {
    continue
}

standard_testfile

# Build two copies of the program, each linked at a different address.
# The address of "main" in the first binary should end up being an
# unmapped address in the second binary.

set exec1 ${testfile}1
set exec2 ${testfile}2
set binfile1 ${binfile}1
set binfile2 ${binfile}2

if { [prepare_for_testing "failed to prepare" ${exec1} "${srcfile}" \
	  [list debug ldflags=-Wl,-Ttext=0x1000000]] } {
    return -1
}
if { [prepare_for_testing "failed to prepare" ${exec2} "${srcfile}" \
	  [list debug ldflags=-Wl,-Ttext=0x2000000]] } {
    return -1
}

# First check whether the address of "main" in exec1 is readable in
# exec2.  If it is, then skip the test as unsupported.

clean_restart ${exec1}
if ![runto_main] then {
    fail "Couldn't run to main"
    return -1
}

set addr ""
set test "main address first"
gdb_test_multiple "p/x &main" $test {
    -re " = (0x\[0-9a-f\]+)\r\n$gdb_prompt $" {
	set addr $expect_out(1,string)
	pass $test
    }
}

clean_restart ${exec2}
if ![runto_main] then {
    fail "Couldn't run to main"
    return -1
}

set cannot_access 0
set test "probe memory access"
gdb_test_multiple "x $addr" $test {
    -re "Cannot access memory at address .*$gdb_prompt $" {
	set cannot_access 1
	pass $test
    }
    -re ".*$gdb_prompt $" {
	pass $test
    }
}

if {!$cannot_access} {
    unsupported "main address is readable in second binary"
    return
}

# The test proper.  ALWAYS_INSERTED indicates whether testing in
# "breakpoint always-inserted" mode.

proc test { always_inserted } {
    global exec1

    clean_restart ${exec1}

    gdb_test_no_output "set breakpoint always-inserted $always_inserted"

    if ![runto_main] then {
	fail "Couldn't run to main"
	return -1
    }

    # On a buggy GDB, with always-inserted on, we'd see:
    #  (gdb) continue
    #  Continuing.
    #  Warning:
    #  Cannot insert breakpoint 1.
    #  Cannot access memory at address 0x10000ff
    gdb_test "continue" "Breakpoint 1, main.*" "continue across exec"
}

foreach always_inserted { "off" "on" } {
    with_test_prefix "always-inserted $always_inserted" {
	test $always_inserted
    }
}