gdb/testsuite/gdb.arch/i386-pkru.exp

   1 # Copyright 2015-2023 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 if { ![istarget i?86-*-*] && ![istarget x86_64-*-* ] } {
  19     unsupported "skipping x86 PKEYS tests."
  20     return
  21 }
  22
  23 set default_pkru_re 0x0
  24 if { [istarget *-*-linux*] } {
  25     # Starting with v4.9, the linux kernel contains commit acd547b29880
  26     # ("x86/pkeys: Default to a restrictive init PKRU"), which sets the
  27     # pkru register to 0x55555554 by default.
  28     set default_pkru_re (0x0|0x55555554)
  29 }
  30
  31
  32 set comp_flags "-I${srcdir}/../nat/"
  33
  34 if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \
  35      [list debug additional_flags=${comp_flags}]] } {
  36     untested "failed to compile x86 PKEYS test."
  37     return -1
  38 }
  39
  40 if ![runto_main] {
  41     return -1
  42 }
  43
  44 set supports_pkru 0
  45 set test "probe PKRU support"
  46 gdb_test_multiple "print have_pkru()" $test {
  47     -re ".. = 1\r\n$gdb_prompt $" {
  48         pass $test
  49         set supports_pkru 1
  50     }
  51     -re ".. = 0\r\n$gdb_prompt $" {
  52         pass $test
  53     }
  54 }
  55
  56 if { !$supports_pkru } {
  57     unsupported "processor does not support protection key feature."
  58     return
  59 }
  60
  61 # Test pkru register at startup
  62 gdb_test "print /x \$pkru" "= $default_pkru_re" "pkru register"
  63
  64 # Read values from pseudo registers.
  65 gdb_breakpoint [ gdb_get_line_number "break here 1" ]
  66 gdb_continue_to_breakpoint "break here 1" ".*break here 1.*"
  67
  68 gdb_test "info register pkru" ".*pkru.*0x12345678.*" "read pkru register"
  69 gdb_test "print /x \$pkru = 0x44444444" "= 0x44444444" "set pkru value"
  70 gdb_test "info register pkru" ".*pkru.*0x44444444.*" "read value after setting value"
  71
  72 gdb_breakpoint [ gdb_get_line_number "break here 2" ]
  73 gdb_continue_to_breakpoint "break here 2" ".*break here 2.*"
  74
  75 gdb_test "print /x rd_value" "= 0x44444444" "variable after reading pkru"