gdb/testsuite/gdb.base/compare-sections.exp

   1 # Copyright 2014-2021 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 # Test the compare-sections command.
  17
  18 standard_testfile
  19
  20 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug}]} {
  21     return -1
  22 }
  23
  24 set is_pie [exec_is_pie $binfile]
  25
  26 # Run the compare-sections command along with any options as specified
  27 # by OPTIONS, and check that no mismatch is found.
  28 proc compare_sections { {options ""} } {
  29     global gdb_prompt
  30
  31     if {$options != ""} {
  32         set command "compare-sections $options"
  33     } else {
  34         set command "compare-sections"
  35     }
  36     set test $command
  37     gdb_test_multiple $command $test {
  38         -re "MIS-MATCHED.*$gdb_prompt $" {
  39             fail $test
  40         }
  41         -re "warning.*One or more sections.*does not match.*loaded file.*$gdb_prompt $" {
  42             fail $test
  43         }
  44         -re "Section.*matched.*$gdb_prompt $" {
  45             pass $test
  46         }
  47     }
  48 }
  49
  50 gdb_file_cmd $binfile
  51
  52 with_test_prefix "after file" {
  53     # Before starting the target, we're just comparing the
  54     # executable's sections against themselves...  This should never
  55     # find a mismatch.
  56     compare_sections
  57     compare_sections "-r"
  58 }
  59
  60 # Load the file into the target.
  61 gdb_reload
  62
  63 with_test_prefix "after reload" {
  64     # We're presumabily still stopped at the entry point.  All
  65     # sections should match.
  66     compare_sections
  67     compare_sections "-r"
  68 }
  69
  70 # Try comparing just one section.  Assume there's a .text section,
  71 # which is a pretty safe bet.
  72 set command "compare-sections .text"
  73 set command_re [string_to_regexp $command]
  74 set test $command
  75 gdb_test_multiple $command $test {
  76     -re "^$command_re\r\nSection .text, range $hex -- $hex. matched\.\r\n$gdb_prompt $" {
  77         pass $test
  78     }
  79 }
  80
  81 # Now get past startup code.
  82 if ![runto_main] then {
  83     fail "can't run to main"
  84     return 0
  85 }
  86
  87 with_test_prefix "after run to main" {
  88     # Assume all targets' startup code changes some loaded variable.
  89     gdb_test "compare-sections" \
  90         "MIS-MATCHED.*warning.*One or more sections.*does not match.*loaded file"
  91
  92     if { $is_pie == 1 } {
  93         gdb_test "compare-sections -r" \
  94             "MIS-MATCHED.*warning.*One or more sections.*does not match.*loaded file"
  95     } else {
  96         # Assume startup code doesn't change read-only sections.
  97         compare_sections "-r"
  98     }
  99 }
 100
 101 # Now test that "compare-sections -r" works as expected.  Look for an
 102 # address in a read-only section, patch it, and check that
 103 # "compare-sections -r" detects a mismatch.
 104 with_test_prefix "read-only" {
 105     set ro_address 0
 106     set has_ro_sections 0
 107     set test "list read-only sections"
 108     gdb_test_multiple "maint info sections READONLY" $test {
 109         -re "($hex)->$hex at $hex. \[^\r\n\]* READONLY.*$gdb_prompt $" {
 110             set ro_address $expect_out(1,string)
 111             set has_ro_sections 1
 112             pass $test
 113         }
 114         -re "$gdb_prompt $" {
 115             pass $test
 116         }
 117     }
 118
 119     if {!$has_ro_sections} {
 120         unsupported "no read-only sections"
 121         return -1;
 122     }
 123
 124     set orig -1
 125
 126     set test "get value of read-only section"
 127     gdb_test_multiple "print /u *(unsigned char *) $ro_address" "$test" {
 128         -re " = (\[0-9\]*).*$gdb_prompt $" {
 129             set orig $expect_out(1,string)
 130             pass "$test"
 131         }
 132     }
 133
 134     if {$orig == -1} {
 135         untested "couldn't read address of read-only section"
 136         return -1
 137     }
 138
 139     # Come up with different value.
 140     set patch [expr 255 - $orig]
 141
 142     # Write PATCH to memory.
 143     set written -1
 144     set test "corrupt read-only section"
 145     gdb_test_multiple "print /u *(unsigned char *) $ro_address = $patch" "$test" {
 146         -re " = .*Cannot access memory at address $ro_address.*$gdb_prompt $" {
 147             pass "$test (cannot write)"
 148         }
 149         -re " = (\[0-9\]*).*$gdb_prompt $" {
 150             set written $expect_out(1,string)
 151             pass "$test"
 152         }
 153     }
 154
 155     if { $written != $patch } {
 156         unsupported "can't patch read-only section"
 157         return -1
 158     }
 159
 160     gdb_test "compare-sections -r" \
 161         "MIS-MATCHED.*warning.*One or more sections.*does not match.*loaded file.*"
 162 }