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      1 # Copyright 2014-2024 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\."
     69