gdb/testsuite/gdb.dwarf2/dw2-bad-elf.exp

   1 # Copyright 2019-2022 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 # Checks for a bug where a baddly formed ELF would cause GDB to crash.
  17 # A section containing executable code, for which there was DWARF is
  18 # accidentally marked as non-alloctable, GDB becomes unhappy.
  19 #
  20 # This test creates some fake DWARF pointing at some symbols in a
  21 # non-allocatable section that is still marked as executable.  We then
  22 # start GDB and try to place a breakpoint on the symbol in the
  23 # non-allocatable section.
  24 #
  25 # It is not expected that the final debug experience really makes
  26 # sense, the symbol is in a non-allocatable section after all, but GDB
  27 # absolutely shouldn't crash.  All we try to do after placing the
  28 # breakpoint is check that GDB is still alive.
  29
  30 load_lib dwarf.exp
  31
  32 # This test can only be run on targets which support DWARF-2 and use gas.
  33 if {![dwarf2_support]} {
  34     return 0
  35 }
  36
  37 standard_testfile main.c -other.S -dwarf.S
  38
  39 if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
  40     untested "failed to compile"
  41     return -1
  42 }
  43
  44 set int_size [get_sizeof "int" 4]
  45
  46 # Make some DWARF for the test.
  47 set asm_file [standard_output_file $srcfile3]
  48 Dwarf::assemble $asm_file {
  49     global srcdir subdir srcfile srcfile2 int_size
  50
  51     declare_labels ranges_label_1 ranges_label_2 L1 L2
  52
  53     set main_result [function_range main ${srcdir}/${subdir}/${srcfile}]
  54     set main_start [lindex $main_result 0]
  55     set main_length [lindex $main_result 1]
  56
  57     cu {} {
  58         DW_TAG_compile_unit {
  59             {DW_AT_language @DW_LANG_C}
  60             {DW_AT_name     $srcfile}
  61             {DW_AT_comp_dir ${srcdir}/${subdir}}
  62             {stmt_list $L1 DW_FORM_sec_offset}
  63             {ranges ${ranges_label_1} DW_FORM_sec_offset}
  64             {DW_AT_low_pc   0 addr}
  65         } {
  66             declare_labels integer_label
  67
  68             DW_TAG_subprogram {
  69                 {name main}
  70                 {low_pc $main_start addr}
  71                 {high_pc $main_length data8}
  72                 {DW_AT_type :$integer_label}
  73                 {DW_AT_decl_file 1 data1}
  74                 {DW_AT_decl_line 10 data1}
  75             }
  76
  77             integer_label: DW_TAG_base_type {
  78                 {DW_AT_byte_size $int_size DW_FORM_sdata}
  79                 {DW_AT_encoding  @DW_ATE_signed}
  80                 {DW_AT_name      integer}
  81             }
  82         }
  83     }
  84
  85     cu {} {
  86         DW_TAG_compile_unit {
  87             {DW_AT_language @DW_LANG_C}
  88             {DW_AT_name     $srcfile2}
  89             {DW_AT_comp_dir ${srcdir}/${subdir}}
  90             {stmt_list $L2 DW_FORM_sec_offset}
  91             {ranges ${ranges_label_2} DW_FORM_sec_offset}
  92             {DW_AT_low_pc   0 addr}
  93         } {
  94             declare_labels integer_label
  95
  96             DW_TAG_subprogram {
  97                 {name some_func}
  98                 {low_pc some_func addr}
  99                 {high_pc some_func_end addr}
 100                 {DW_AT_type :$integer_label}
 101                 {DW_AT_decl_file 2 data1}
 102                 {DW_AT_decl_line 5 data1}
 103             }
 104
 105             integer_label: DW_TAG_base_type {
 106                 {DW_AT_byte_size $int_size DW_FORM_sdata}
 107                 {DW_AT_encoding  @DW_ATE_signed}
 108                 {DW_AT_name      integer}
 109             }
 110         }
 111     }
 112
 113     ranges {is_64 [is_64_target]} {
 114         ranges_label_1: sequence {
 115             base [lindex $main_result 0]
 116             range 0 [lindex $main_result 1]
 117         }
 118         ranges_label_2: sequence {
 119             base some_func
 120             range 0 64
 121         }
 122     }
 123
 124     lines {version 2} L1 {
 125         include_dir "${srcdir}/${subdir}"
 126         file_name "$srcfile" 1
 127
 128         # Line data doens't need to be correct, just present.
 129         program {
 130             DW_LNE_set_address [lindex $main_result 0]
 131             DW_LNS_advance_line 10
 132             DW_LNS_copy
 133             DW_LNS_advance_pc [lindex $main_result 1]
 134             DW_LNS_advance_line 19
 135             DW_LNS_copy
 136             DW_LNE_end_sequence
 137         }
 138     }
 139
 140     lines {version 2} L2 {
 141         include_dir "${srcdir}/${subdir}"
 142         file_name "dw2-bad-elf-other.c" 1
 143
 144         # Line data doens't need to be correct, just present.
 145         program {
 146             DW_LNE_set_address some_func
 147             DW_LNS_advance_line 5
 148             DW_LNS_copy
 149             DW_LNS_advance_pc 64
 150             DW_LNS_advance_line 8
 151             DW_LNS_copy
 152             DW_LNE_end_sequence
 153         }
 154     }
 155 }
 156
 157 if { [build_executable ${testfile}.exp ${testfile} \
 158           [list $srcfile $srcfile2 $asm_file] {nodebug}] } {
 159     return -1
 160 }
 161
 162 # Attempt to place a breakpoint on 'some_func', then check GDB is
 163 # still alive.  This test can optionally set a breakpoint on 'main'
 164 # first (based on GOTO_MAIN), the original bug behaved differently
 165 # when there was already a breakpoint set.
 166 proc run_test { goto_main } {
 167     global binfile decimal hex
 168
 169     clean_restart ${binfile}
 170
 171     if { $goto_main } {
 172         if ![runto_main] {
 173             return -1
 174         }
 175     }
 176
 177     # Place a breakpoint.
 178     gdb_test "break some_func" \
 179         "Breakpoint $decimal at $hex: file .*dw2-bad-elf-other\\.c, line 6\\."
 180
 181     # Check GDB is still alive.
 182     gdb_test "echo hello\\n" "hello"
 183 }
 184
 185 # Run the tests.
 186 foreach_with_prefix goto_main { 0 1 } {
 187     run_test $goto_main
 188 }