binutils-gdb/gdb/testsuite/gdb.base/breakpoint-in-ro-region.exp

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# Copyright 2014-2015 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/>.
# This file is part of the gdb testsuite
standard_testfile
if { [prepare_for_testing "failed to prepare" $testfile $srcfile] } {
return -1
}
if ![runto main] {
return -1
}
delete_breakpoints
# Probe for hardware stepping.
proc probe_target_hardware_step {} {
global gdb_prompt
set hw_step 0
gdb_test_no_output "set debug target 1"
set test "probe target hardware step"
gdb_test_multiple "si" $test {
-re "to_resume \\(\[^\r\n\]+, step, .*$gdb_prompt $" {
set hw_step 1
pass $test
}
-re "$gdb_prompt $" {
pass $test
}
}
gdb_test "set debug target 0" "->to_log_command.*\\).*"
return $hw_step
}
# Get the bounds of a function, and write them to FUNC_LO (inclusive),
# FUNC_HI (exclusive). Return true on success and false on failure.
proc get_function_bounds {function func_lo func_hi} {
global gdb_prompt
global hex decimal
upvar $func_lo lo
upvar $func_hi hi
set lo ""
set size ""
set test "get lo address of $function"
gdb_test_multiple "disassemble $function" $test {
-re "($hex) .*$hex <\\+($decimal)>:\[^\r\n\]+\r\nEnd of assembler dump\.\r\n$gdb_prompt $" {
set lo $expect_out(1,string)
set size $expect_out(2,string)
pass $test
}
}
if { $lo == "" || $size == "" } {
return false
}
# Account for the size of the last instruction.
set test "get hi address of $function"
gdb_test_multiple "x/2i $function+$size" $test {
-re ".*$hex <$function\\+$size>:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" {
set hi $expect_out(1,string)
pass $test
}
}
if { $hi == "" } {
return false
}
# Remove unnecessary leading 0's (0x00000ADDR => 0xADDR) so we can
# easily do matches. Disassemble includes leading zeros, while
# x/i doesn't.
regsub -all "0x0\+" $lo "0x" lo
regsub -all "0x0\+" $hi "0x" hi
return true
}
# Get the address where the thread is currently stopped.
proc get_curr_insn {} {
global gdb_prompt
global hex
set pc ""
set test "get current insn"
gdb_test_multiple "p /x \$pc" $test {
-re " = ($hex)\r\n$gdb_prompt $" {
set pc $expect_out(1,string)
pass $test
}
}
return $pc
}
# Get the address of where a single-step should land.
proc get_next_insn {} {
global gdb_prompt
global hex
set next ""
set test "get next insn"
gdb_test_multiple "x/2i \$pc" $test {
-re "$hex .*:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" {
set next $expect_out(1,string)
pass $test
}
}
return $next
}
set hw_step [probe_target_hardware_step]
if ![get_function_bounds "main" main_lo main_hi] {
# Can't do the following tests if main's bounds are unknown.
return -1
}
# Manually create a read-only memory region that covers 'main'.
gdb_test_no_output "mem $main_lo $main_hi ro" \
"create read-only mem region covering main"
# So that we don't fail inserting breakpoints on addresses outside
# main, like the internal event breakpoints.
gdb_test_no_output "set mem inaccessible-by-default off"
# So we get an immediate warning/error without needing to resume the
# target.
gdb_test_no_output "set breakpoint always-inserted on"
# Disable the automatic fallback to HW breakpoints. We want a
# software breakpoint to be attempted, and to fail.
gdb_test_no_output "set breakpoint auto-hw off"
# Confirm manual writes to the read-only memory region fail.
gdb_test "p /x *(char *) $main_lo = 1" \
"Cannot access memory at address $main_lo" \
"writing to read-only memory fails"
# Ensure that inserting a software breakpoint in a known-read-only
# region fails.
gdb_test "break *$main_lo" \
"Cannot insert breakpoint .*Cannot set software breakpoint at read-only address $main_lo.*" \
"inserting software breakpoint in read-only memory fails"
delete_breakpoints
set supports_hbreak 0
set test "probe hbreak support"
gdb_test_multiple "hbreak *$main_lo" $test {
-re "You may have requested too many.*$gdb_prompt $" {
pass "$test (no support)"
}
-re "No hardware breakpoint support.*$gdb_prompt $" {
pass "$test (no support)"
}
-re "$gdb_prompt $" {
pass "$test (support)"
set supports_hbreak 1
}
}
delete_breakpoints
# Check that the "auto-hw on/off" setting affects single-step
# breakpoints as expected, by stepping through the read-only region.
# If the target does hardware stepping, we won't exercise that aspect,
# but we should be able to step through the region without seeing the
# hardware breakpoint or read-only address errors.
proc test_single_step { always_inserted auto_hw } {
global gdb_prompt
global decimal
global hex
global supports_hbreak
global hw_step
gdb_test_no_output "set breakpoint always-inserted $always_inserted"
gdb_test_no_output "set breakpoint auto-hw $auto_hw"
# Get the address of the current instruction so we know where SI is
# starting from.
set curr_insn [get_curr_insn]
# Get the address of the next instruction so we know where SI should
# land.
set next_insn [get_next_insn]
set test "step in ro region"
gdb_test_multiple "si" $test {
-re "Could not insert hardware breakpoints.*$gdb_prompt $" {
gdb_assert {!$hw_step && $auto_hw == "on" && !$supports_hbreak} \
"$test (cannot insert hw break)"
}
-re "Cannot set software breakpoint at read-only address $next_insn.*$gdb_prompt $" {
gdb_assert {!$hw_step && $auto_hw == "off"} \
"$test (cannot insert sw break)"
}
-re "^si\r\nNote: automatically using hardware breakpoints for read-only addresses\.\r\n\(\?\:${hex}\[ \t\]\)\?${decimal}\[ \t\]+i = 0;\r\n$gdb_prompt $" {
gdb_assert {!$hw_step && $auto_hw == "on" && $supports_hbreak} \
"$test (auto-hw)"
}
-re "^si\r\n\(\?\:${hex}\[ \t\]\)\?${decimal}\[ \t\]+i = 0;\r\n$gdb_prompt $" {
gdb_assert {$hw_step || ($auto_hw == "on" && $supports_hbreak)} \
"$test (no error)"
}
}
gdb_test "maint info breakpoints 0" \
"No breakpoint or watchpoint matching '0'\." \
"single-step breakpoint is not left behind"
# Confirm the thread really advanced.
if {$hw_step || ($auto_hw == "on" && $supports_hbreak)} {
gdb_test "p /x \$pc" " = $next_insn" "thread advanced"
} else {
gdb_test "p /x \$pc" " = $curr_insn" "thread did not advance"
}
}
foreach always_inserted {"off" "on"} {
foreach auto_hw {"off" "on"} {
with_test_prefix "always-inserted $always_inserted: auto-hw $auto_hw" {
test_single_step $always_inserted $auto_hw
}
}
}