gdb/testsuite/gdb.base/dcache-line-read-error.exp

   1 # Copyright 2014-2022 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 # Test that dcache behaves correctly when reading a cache line fails.
  17
  18 standard_testfile
  19
  20 if { [prepare_for_testing "failed to prepare" ${testfile}] } {
  21     return -1
  22 }
  23
  24 if ![runto breakpt] {
  25     return -1
  26 }
  27
  28 # Issue the "delete mem" command.  This makes GDB ignore the
  29 # target-provided list, if any.
  30
  31 proc delete_mem {} {
  32     global gdb_prompt
  33
  34     set test "delete mem"
  35     gdb_test_multiple $test $test {
  36         -re "Delete all memory regions.*y or n.*$" {
  37             send_gdb "y\n"
  38             exp_continue
  39         }
  40         -re "$gdb_prompt $" {
  41             pass $test
  42         }
  43     }
  44 }
  45
  46 # Make the dcache line size bigger than the pagesize.
  47 set pagesize [get_integer_valueof "pg_size" -1]
  48 set linesize [expr $pagesize * 2]
  49
  50 gdb_test_no_output "set dcache line-size $linesize" \
  51     "set dcache line size to twice the pagesize"
  52
  53 gdb_test "info dcache" \
  54     "Dcache 4096 lines of $linesize bytes each.\r\nNo data cache available."
  55
  56 # Make sure dcache doesn't automatically skip unmapped regions.
  57 delete_mem
  58
  59 gdb_test "info mem" \
  60     "Using user-defined memory regions.\r\nThere are no memory regions defined\."
  61
  62 # Given the line size is bigger than the page size, we have
  63 # alternating mapped and unmapped pages, these make dcache fail to
  64 # fill in the cache line.  GDB used to have a bug where that failure
  65 # would end up as user-visible error.  The range being disassembled is
  66 # wholly available, so GDB should succeed.
  67 gdb_test "disassemble first_mapped_page, +10" "End of assembler dump\."
  68 gdb_test "disassemble last_mapped_page, +10" "End of assembler dump\."