gdb/testsuite/gdb.base/coredump-filter.exp

   1 # Copyright 2015-2016 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 standard_testfile
  17
  18 # This test is Linux-only.
  19 if ![istarget *-*-linux*] then {
  20     untested "coredump-filter.exp"
  21     return -1
  22 }
  23
  24 if { [prepare_for_testing "failed to prepare" $testfile $srcfile debug] } {
  25     return -1
  26 }
  27
  28 if { ![runto_main] } {
  29     untested "could not run to main"
  30     return -1
  31 }
  32
  33 gdb_breakpoint [gdb_get_line_number "break-here"]
  34 gdb_continue_to_breakpoint "break-here" ".* break-here .*"
  35
  36 proc do_save_core { filter_flag core } {
  37     verbose -log "writing $filter_flag to /proc/<inferior pid>/coredump_filter"
  38
  39     gdb_test "p set_coredump_filter ($filter_flag)" " = 0"
  40
  41     # Generate a corefile.
  42     gdb_gcore_cmd "$core" "save corefile"
  43 }
  44
  45 proc do_load_and_test_core { core var working_var working_value } {
  46     global hex decimal coredump_var_addr
  47
  48     set core_loaded [gdb_core_cmd "$core" "load core"]
  49     if { $core_loaded == -1 } {
  50         fail "loading $core"
  51         return
  52     }
  53
  54     # Access the memory the addresses point to.
  55     gdb_test "print/x *(char *) $coredump_var_addr($var)" "\(\\\$$decimal = <error: \)?Cannot access memory at address $hex\(>\)?" \
  56         "printing $var when core is loaded (should not work)"
  57     gdb_test "print/x *(char *) $coredump_var_addr($working_var)" " = $working_value.*" \
  58         "print/x *$working_var ( = $working_value)"
  59 }
  60
  61 # We do not do file-backed mappings in the test program, but it is
  62 # important to test this anyway.  One way of performing the test is to
  63 # load GDB with a corefile but without a binary, and then ask for the
  64 # disassemble of a function (i.e., the binary's .text section).  GDB
  65 # should fail in this case.  However, it must succeed if the binary is
  66 # provided along with the corefile.  This is what we test here.
  67
  68 proc test_disasm { core address should_fail } {
  69     global testfile hex
  70
  71     # Restart GDB without loading the binary.
  72     with_test_prefix "no binary" {
  73         gdb_exit
  74         gdb_start
  75
  76         set core_loaded [gdb_core_cmd "$core" "load core"]
  77         if { $core_loaded == -1 } {
  78             fail "loading $core"
  79             return
  80         }
  81
  82         if { $should_fail == 1 } {
  83             gdb_test "x/i \$pc" "=> $hex:\tCannot access memory at address $hex" \
  84                 "disassemble function with corefile and without a binary"
  85         } else {
  86             gdb_test "x/i \$pc" "=> $hex:\t\[^C\].*" \
  87                 "disassemble function with corefile and without a binary"
  88         }
  89     }
  90
  91     with_test_prefix "with binary" {
  92         clean_restart $testfile
  93
  94         set core_loaded [gdb_core_cmd "$core" "load core"]
  95         if { $core_loaded == -1 } {
  96             fail "loading $core"
  97             return
  98         }
  99
 100         gdb_test "disassemble $address" "Dump of assembler code for function.*" \
 101             "disassemble function with corefile and with a binary"
 102     }
 103 }
 104
 105 set non_private_anon_core [standard_output_file non-private-anon.gcore]
 106 set non_shared_anon_core [standard_output_file non-shared-anon.gcore]
 107 # A corefile without {private,shared} {anonymous,file-backed} pages
 108 set non_private_shared_anon_file_core [standard_output_file non-private-shared-anon-file.gcore]
 109 set dont_dump_core [standard_output_file dont-dump.gcore]
 110
 111 # We will generate a few corefiles.
 112 #
 113 # This list is composed by sub-lists, and their elements are (in
 114 # order):
 115 #
 116 # - name of the test
 117 # - hexadecimal value to be put in the /proc/PID/coredump_filter file
 118 # - name of the variable that contains the name of the corefile to be
 119 #   generated (including the initial $).
 120 # - name of the variable in the C source code that points to the
 121 #   memory mapping that will NOT be present in the corefile.
 122 # - name of a variable in the C source code that points to a memory
 123 #   mapping that WILL be present in the corefile
 124 # - corresponding value expected for the above variable
 125 #
 126 # This list refers to the corefiles generated by MAP_ANONYMOUS in the
 127 # test program.
 128
 129 set all_anon_corefiles { { "non-Private-Anonymous" "0x7e" \
 130                                $non_private_anon_core \
 131                                "private_anon" \
 132                                "shared_anon" "0x22" }
 133     { "non-Shared-Anonymous" "0x7d" \
 134           $non_shared_anon_core "shared_anon" \
 135           "private_anon" "0x11" }
 136     { "DoNotDump" "0x33" \
 137           $dont_dump_core "dont_dump" \
 138           "shared_anon" "0x22" } }
 139
 140 # If corefile loading is not supported, we do not even try to run the
 141 # tests.
 142 set core_supported [gdb_gcore_cmd "$non_private_anon_core" "save a corefile"]
 143 if { !$core_supported } {
 144     untested "corefile generation is not supported"
 145     return -1
 146 }
 147
 148 gdb_test_multiple "info inferiors" "getting inferior pid" {
 149     -re "process $decimal.*\r\n$gdb_prompt $" {
 150     }
 151     -re "Remote target.*$gdb_prompt $" {
 152         # If the target does not provide PID information (like usermode QEMU),
 153         # just bail out as the rest of the test may rely on it, giving spurious
 154         # failures.
 155         return -1
 156     }
 157 }
 158
 159 # Get the main function's address.
 160 set main_addr ""
 161 gdb_test_multiple "print/x &main" "getting main's address" {
 162     -re "$decimal = \($hex\)\r\n$gdb_prompt $" {
 163         set main_addr $expect_out(1,string)
 164     }
 165 }
 166
 167 # Obtain the address of each variable that will be checked on each
 168 # case.
 169 unset -nocomplain coredump_var_addr
 170 foreach item $all_anon_corefiles {
 171     foreach name [list [lindex $item 3] [lindex $item 4]] {
 172         set test "print/x $name"
 173         gdb_test_multiple $test $test {
 174             -re " = \($hex\)\r\n$gdb_prompt $" {
 175                 set coredump_var_addr($name) $expect_out(1,string)
 176             }
 177         }
 178     }
 179 }
 180
 181 # Generate corefiles for the "anon" case.
 182 foreach item $all_anon_corefiles {
 183     with_test_prefix "saving corefile for [lindex $item 0]" {
 184         do_save_core [lindex $item 1] [subst [lindex $item 2]]
 185     }
 186 }
 187
 188 with_test_prefix "saving corefile for non-Private-Shared-Anon-File" {
 189     do_save_core "0x60" $non_private_shared_anon_file_core
 190 }
 191
 192 clean_restart $testfile
 193
 194 foreach item $all_anon_corefiles {
 195     with_test_prefix "loading and testing corefile for [lindex $item 0]" {
 196         do_load_and_test_core [subst [lindex $item 2]] [lindex $item 3] \
 197             [lindex $item 4] [lindex $item 5]
 198     }
 199
 200     with_test_prefix "disassembling function main for [lindex $item 0]" {
 201         test_disasm [subst [lindex $item 2]] $main_addr 0
 202     }
 203 }
 204
 205 with_test_prefix "loading and testing corefile for non-Private-Shared-Anon-File" {
 206     test_disasm $non_private_shared_anon_file_core $main_addr 1
 207 }