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   /* Create a mock environment.  An inferior with a thread, with a
  75      process_stratum target pushed.  */
  76
  77   test_target_ops mock_target;
  78   ptid_t mock_ptid (1, 1);
  79   inferior mock_inferior (mock_ptid.pid ());
  80   address_space mock_aspace {};
  81   mock_inferior.gdbarch = gdbarch;
  82   mock_inferior.aspace = &mock_aspace;
  83   thread_info mock_thread (&mock_inferior, mock_ptid);
  84
  85   scoped_restore restore_thread_list
  86     = make_scoped_restore (&mock_inferior.thread_list, &mock_thread);
  87
  88   /* Add the mock inferior to the inferior list so that look ups by
  89      target+ptid can find it.  */
  90   scoped_restore restore_inferior_list
  91     = make_scoped_restore (&inferior_list);
  92   inferior_list = &mock_inferior;
  93
  94   /* Switch to the mock inferior.  */
  95   scoped_restore_current_inferior restore_current_inferior;
  96   set_current_inferior (&mock_inferior);
  97
  98   /* Push the process_stratum target so we can mock accessing
  99      registers.  */
 100   push_target (&mock_target);
 101
 102   /* Pop it again on exit (return/exception).  */
 103   SCOPE_EXIT { pop_all_targets_at_and_above (process_stratum); };
 104
 105   /* Switch to the mock thread.  */
 106   scoped_restore restore_inferior_ptid
 107     = make_scoped_restore (&inferior_ptid, mock_ptid);
 108
 109   struct frame_info *frame = get_current_frame ();
 110   const int num_regs = gdbarch_num_cooked_regs (gdbarch);
 111
 112   /* Test gdbarch methods register_to_value and value_to_register with
 113      different combinations of register numbers and types.  */
 114   for (const auto &type : types)
 115     {
 116       for (auto regnum = 0; regnum < num_regs; regnum++)
 117         {
 118           if (gdbarch_convert_register_p (gdbarch, regnum, type))
 119             {
 120               std::vector<gdb_byte> expected (TYPE_LENGTH (type), 0);
 121
 122               if (TYPE_CODE (type) == TYPE_CODE_FLT)
 123                 {
 124                   /* Generate valid float format.  */
 125                   target_float_from_string (expected.data (), type, "1.25");
 126                 }
 127               else
 128                 {
 129                   for (auto j = 0; j < expected.size (); j++)
 130                     expected[j] = (regnum + j) % 16;
 131                 }
 132
 133               gdbarch_value_to_register (gdbarch, frame, regnum, type,
 134                                          expected.data ());
 135
 136               /* Allocate two bytes more for overflow check.  */
 137               std::vector<gdb_byte> buf (TYPE_LENGTH (type) + 2, 0);
 138               int optim, unavail, ok;
 139
 140               /* Set the fingerprint in the last two bytes.  */
 141               buf [TYPE_LENGTH (type)]= 'w';
 142               buf [TYPE_LENGTH (type) + 1]= 'l';
 143               ok = gdbarch_register_to_value (gdbarch, frame, regnum, type,
 144                                               buf.data (), &optim, &unavail);
 145
 146               SELF_CHECK (ok);
 147               SELF_CHECK (!optim);
 148               SELF_CHECK (!unavail);
 149
 150               SELF_CHECK (buf[TYPE_LENGTH (type)] == 'w');
 151               SELF_CHECK (buf[TYPE_LENGTH (type) + 1] == 'l');
 152
 153               for (auto k = 0; k < TYPE_LENGTH(type); k++)
 154                 SELF_CHECK (buf[k] == expected[k]);
 155             }
 156         }
 157     }
 158 }
 159
 160 } // namespace selftests
 161 #endif /* GDB_SELF_TEST */
 162
 163 void
 164 _initialize_gdbarch_selftests (void)
 165 {
 166 #if GDB_SELF_TEST
 167   selftests::register_test_foreach_arch ("register_to_value",
 168                                          selftests::register_to_value_test);
 169 #endif
 170 }