gdb/gdbarch-selftests.c

   1 /* Self tests for gdbarch for GDB, the GNU debugger.
   2
   3    Copyright (C) 2017-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #if GDB_SELF_TEST
  22 #include "gdbsupport/selftest.h"
  23 #include "selftest-arch.h"
  24 #include "inferior.h"
  25 #include "gdbthread.h"
  26 #include "target.h"
  27 #include "test-target.h"
  28 #include "target-float.h"
  29 #include "gdbsupport/def-vector.h"
  30 #include "gdbarch.h"
  31
  32 namespace selftests {
  33
  34 /* Test gdbarch methods register_to_value and value_to_register.  */
  35
  36 static void
  37 register_to_value_test (struct gdbarch *gdbarch)
  38 {
  39   const struct builtin_type *builtin = builtin_type (gdbarch);
  40   struct type *types[] =
  41     {
  42       builtin->builtin_void,
  43       builtin->builtin_char,
  44       builtin->builtin_short,
  45       builtin->builtin_int,
  46       builtin->builtin_long,
  47       builtin->builtin_signed_char,
  48       builtin->builtin_unsigned_short,
  49       builtin->builtin_unsigned_int,
  50       builtin->builtin_unsigned_long,
  51       builtin->builtin_float,
  52       builtin->builtin_double,
  53       builtin->builtin_long_double,
  54       builtin->builtin_complex,
  55       builtin->builtin_double_complex,
  56       builtin->builtin_string,
  57       builtin->builtin_bool,
  58       builtin->builtin_long_long,
  59       builtin->builtin_unsigned_long_long,
  60       builtin->builtin_int8,
  61       builtin->builtin_uint8,
  62       builtin->builtin_int16,
  63       builtin->builtin_uint16,
  64       builtin->builtin_int32,
  65       builtin->builtin_uint32,
  66       builtin->builtin_int64,
  67       builtin->builtin_uint64,
  68       builtin->builtin_int128,
  69       builtin->builtin_uint128,
  70       builtin->builtin_char16,
  71       builtin->builtin_char32,
  72     };
  73
  74   /* Error out if debugging something, because we're going to push the
  75      test target, which would pop any existing target.  */
  76   if (current_top_target ()->stratum () >= process_stratum)
  77    error (_("target already pushed"));
  78
  79   /* Create a mock environment.  An inferior with a thread, with a
  80      process_stratum target pushed.  */
  81
  82   test_target_ops mock_target;
  83   ptid_t mock_ptid (1, 1);
  84   inferior mock_inferior (mock_ptid.pid ());
  85   address_space mock_aspace {};
  86   mock_inferior.gdbarch = gdbarch;
  87   mock_inferior.aspace = &mock_aspace;
  88   thread_info mock_thread (&mock_inferior, mock_ptid);
  89
  90   scoped_restore restore_thread_list
  91     = make_scoped_restore (&mock_inferior.thread_list, &mock_thread);
  92
  93   /* Add the mock inferior to the inferior list so that look ups by
  94      target+ptid can find it.  */
  95   scoped_restore restore_inferior_list
  96     = make_scoped_restore (&inferior_list);
  97   inferior_list = &mock_inferior;
  98
  99   /* Switch to the mock inferior.  */
 100   scoped_restore_current_inferior restore_current_inferior;
 101   set_current_inferior (&mock_inferior);
 102
 103   /* Push the process_stratum target so we can mock accessing
 104      registers.  */
 105   push_target (&mock_target);
 106
 107   /* Pop it again on exit (return/exception).  */
 108   SCOPE_EXIT { pop_all_targets_at_and_above (process_stratum); };
 109
 110   /* Switch to the mock thread.  */
 111   scoped_restore restore_inferior_ptid
 112     = make_scoped_restore (&inferior_ptid, mock_ptid);
 113
 114   struct frame_info *frame = get_current_frame ();
 115   const int num_regs = gdbarch_num_cooked_regs (gdbarch);
 116
 117   /* Test gdbarch methods register_to_value and value_to_register with
 118      different combinations of register numbers and types.  */
 119   for (const auto &type : types)
 120     {
 121       for (auto regnum = 0; regnum < num_regs; regnum++)
 122         {
 123           if (gdbarch_convert_register_p (gdbarch, regnum, type))
 124             {
 125               std::vector<gdb_byte> expected (TYPE_LENGTH (type), 0);
 126
 127               if (TYPE_CODE (type) == TYPE_CODE_FLT)
 128                 {
 129                   /* Generate valid float format.  */
 130                   target_float_from_string (expected.data (), type, "1.25");
 131                 }
 132               else
 133                 {
 134                   for (auto j = 0; j < expected.size (); j++)
 135                     expected[j] = (regnum + j) % 16;
 136                 }
 137
 138               gdbarch_value_to_register (gdbarch, frame, regnum, type,
 139                                          expected.data ());
 140
 141               /* Allocate two bytes more for overflow check.  */
 142               std::vector<gdb_byte> buf (TYPE_LENGTH (type) + 2, 0);
 143               int optim, unavail, ok;
 144
 145               /* Set the fingerprint in the last two bytes.  */
 146               buf [TYPE_LENGTH (type)]= 'w';
 147               buf [TYPE_LENGTH (type) + 1]= 'l';
 148               ok = gdbarch_register_to_value (gdbarch, frame, regnum, type,
 149                                               buf.data (), &optim, &unavail);
 150
 151               SELF_CHECK (ok);
 152               SELF_CHECK (!optim);
 153               SELF_CHECK (!unavail);
 154
 155               SELF_CHECK (buf[TYPE_LENGTH (type)] == 'w');
 156               SELF_CHECK (buf[TYPE_LENGTH (type) + 1] == 'l');
 157
 158               for (auto k = 0; k < TYPE_LENGTH(type); k++)
 159                 SELF_CHECK (buf[k] == expected[k]);
 160             }
 161         }
 162     }
 163 }
 164
 165 } // namespace selftests
 166 #endif /* GDB_SELF_TEST */
 167
 168 void
 169 _initialize_gdbarch_selftests (void)
 170 {
 171 #if GDB_SELF_TEST
 172   selftests::register_test_foreach_arch ("register_to_value",
 173                                          selftests::register_to_value_test);
 174 #endif
 175 }