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# Copyright 2014-2021 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 the compare-sections command.
standard_testfile
if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug}]} {
return -1
}
set is_pie [exec_is_pie $binfile]
# Run the compare-sections command along with any options as specified
# by OPTIONS, and check that no mismatch is found.
proc compare_sections { {options ""} } {
global gdb_prompt
if {$options != ""} {
set command "compare-sections $options"
} else {
set command "compare-sections"
}
set test $command
gdb_test_multiple $command $test {
-re "MIS-MATCHED.*$gdb_prompt $" {
fail $test
}
-re "warning.*One or more sections.*does not match.*loaded file.*$gdb_prompt $" {
fail $test
}
-re "Section.*matched.*$gdb_prompt $" {
pass $test
}
}
}
gdb_file_cmd $binfile
with_test_prefix "after file" {
# Before starting the target, we're just comparing the
# executable's sections against themselves... This should never
# find a mismatch.
compare_sections
compare_sections "-r"
}
# Load the file into the target.
gdb_reload
with_test_prefix "after reload" {
# We're presumabily still stopped at the entry point. All
# sections should match.
compare_sections
compare_sections "-r"
}
# Try comparing just one section. Assume there's a .text section,
# which is a pretty safe bet.
set command "compare-sections .text"
set command_re [string_to_regexp $command]
set test $command
gdb_test_multiple $command $test {
-re "^$command_re\r\nSection .text, range $hex -- $hex. matched\.\r\n$gdb_prompt $" {
pass $test
}
}
# Now get past startup code.
if ![runto_main] then {
fail "can't run to main"
return 0
}
with_test_prefix "after run to main" {
# Assume all targets' startup code changes some loaded variable.
gdb_test "compare-sections" \
"MIS-MATCHED.*warning.*One or more sections.*does not match.*loaded file"
if { $is_pie == 1 } {
gdb_test "compare-sections -r" \
"MIS-MATCHED.*warning.*One or more sections.*does not match.*loaded file"
} else {
# Assume startup code doesn't change read-only sections.
compare_sections "-r"
}
}
# Now test that "compare-sections -r" works as expected. Look for an
# address in a read-only section, patch it, and check that
# "compare-sections -r" detects a mismatch.
with_test_prefix "read-only" {
set ro_address 0
set has_ro_sections 0
set test "list read-only sections"
gdb_test_multiple "maint info sections READONLY" $test {
-re "($hex)->$hex at $hex. \[^\r\n\]* READONLY.*$gdb_prompt $" {
set ro_address $expect_out(1,string)
set has_ro_sections 1
pass $test
}
-re "$gdb_prompt $" {
pass $test
}
}
if {!$has_ro_sections} {
unsupported "no read-only sections"
return -1;
}
set orig -1
set test "get value of read-only section"
gdb_test_multiple "print /u *(unsigned char *) $ro_address" "$test" {
-re " = (\[0-9\]*).*$gdb_prompt $" {
set orig $expect_out(1,string)
pass "$test"
}
}
if {$orig == -1} {
untested "couldn't read address of read-only section"
return -1
}
# Come up with different value.
set patch [expr 255 - $orig]
# Write PATCH to memory.
set written -1
set test "corrupt read-only section"
gdb_test_multiple "print /u *(unsigned char *) $ro_address = $patch" "$test" {
-re " = .*Cannot access memory at address $ro_address.*$gdb_prompt $" {
pass "$test (cannot write)"
}
-re " = (\[0-9\]*).*$gdb_prompt $" {
set written $expect_out(1,string)
pass "$test"
}
}
if { $written != $patch } {
unsupported "can't patch read-only section"
return -1
}
gdb_test "compare-sections -r" \
"MIS-MATCHED.*warning.*One or more sections.*does not match.*loaded file.*"
}
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