gdb/disasm-selftests.c

   1 /* Self tests for disassembler for GDB, the GNU debugger.
   2
   3    Copyright (C) 2017-2018 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 #include "disasm.h"
  22
  23 #if GDB_SELF_TEST
  24 #include "selftest.h"
  25 #include "selftest-arch.h"
  26
  27 namespace selftests {
  28
  29 /* Test disassembly of one instruction.  */
  30
  31 static void
  32 print_one_insn_test (struct gdbarch *gdbarch)
  33 {
  34   size_t len = 0;
  35   const gdb_byte *insn = NULL;
  36
  37   switch (gdbarch_bfd_arch_info (gdbarch)->arch)
  38     {
  39     case bfd_arch_bfin:
  40       /* M3.L = 0xe117 */
  41       static const gdb_byte bfin_insn[] = {0x17, 0xe1, 0xff, 0xff};
  42
  43       insn = bfin_insn;
  44       len = sizeof (bfin_insn);
  45       break;
  46     case bfd_arch_arm:
  47       /* mov     r0, #0 */
  48       static const gdb_byte arm_insn[] = {0x0, 0x0, 0xa0, 0xe3};
  49
  50       insn = arm_insn;
  51       len = sizeof (arm_insn);
  52       break;
  53     case bfd_arch_ia64:
  54     case bfd_arch_mep:
  55     case bfd_arch_mips:
  56     case bfd_arch_tic6x:
  57     case bfd_arch_xtensa:
  58       return;
  59     case bfd_arch_s390:
  60       /* nopr %r7 */
  61       static const gdb_byte s390_insn[] = {0x07, 0x07};
  62
  63       insn = s390_insn;
  64       len = sizeof (s390_insn);
  65       break;
  66     case bfd_arch_xstormy16:
  67       /* nop */
  68       static const gdb_byte xstormy16_insn[] = {0x0, 0x0};
  69
  70       insn = xstormy16_insn;
  71       len = sizeof (xstormy16_insn);
  72       break;
  73     case bfd_arch_arc:
  74       /* PR 21003 */
  75       if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_arc_arc601)
  76         return;
  77       /* fall through */
  78     case bfd_arch_nios2:
  79     case bfd_arch_score:
  80       /* nios2 and score need to know the current instruction to select
  81          breakpoint instruction.  Give the breakpoint instruction kind
  82          explicitly.  */
  83       int bplen;
  84       insn = gdbarch_sw_breakpoint_from_kind (gdbarch, 4, &bplen);
  85       len = bplen;
  86       break;
  87     default:
  88       {
  89         /* Test disassemble breakpoint instruction.  */
  90         CORE_ADDR pc = 0;
  91         int kind = gdbarch_breakpoint_kind_from_pc (gdbarch, &pc);
  92         int bplen;
  93
  94         insn = gdbarch_sw_breakpoint_from_kind (gdbarch, kind, &bplen);
  95         len = bplen;
  96
  97         break;
  98       }
  99     }
 100   SELF_CHECK (len > 0);
 101
 102   /* Test gdb_disassembler for a given gdbarch by reading data from a
 103      pre-allocated buffer.  If you want to see the disassembled
 104      instruction printed to gdb_stdout, set verbose to true.  */
 105   static const bool verbose = false;
 106
 107   class gdb_disassembler_test : public gdb_disassembler
 108   {
 109   public:
 110
 111     explicit gdb_disassembler_test (struct gdbarch *gdbarch,
 112                                     const gdb_byte *insn,
 113                                     size_t len)
 114       : gdb_disassembler (gdbarch,
 115                           (verbose ? gdb_stdout : &null_stream),
 116                           gdb_disassembler_test::read_memory),
 117         m_insn (insn), m_len (len)
 118     {
 119     }
 120
 121     int
 122     print_insn (CORE_ADDR memaddr)
 123     {
 124       if (verbose)
 125         {
 126           fprintf_unfiltered (stream (), "%s ",
 127                               gdbarch_bfd_arch_info (arch ())->arch_name);
 128         }
 129
 130       int len = gdb_disassembler::print_insn (memaddr);
 131
 132       if (verbose)
 133         fprintf_unfiltered (stream (), "\n");
 134
 135       return len;
 136     }
 137
 138   private:
 139     /* A buffer contain one instruction.  */
 140     const gdb_byte *m_insn;
 141
 142     /* Length of the buffer.  */
 143     size_t m_len;
 144
 145     static int read_memory (bfd_vma memaddr, gdb_byte *myaddr,
 146                             unsigned int len, struct disassemble_info *info)
 147     {
 148       gdb_disassembler_test *self
 149         = static_cast<gdb_disassembler_test *>(info->application_data);
 150
 151       /* The disassembler in opcodes may read more data than one
 152          instruction.  Supply infinite consecutive copies
 153          of the same instruction.  */
 154       for (size_t i = 0; i < len; i++)
 155         myaddr[i] = self->m_insn[(memaddr + i) % self->m_len];
 156
 157       return 0;
 158     }
 159   };
 160
 161   gdb_disassembler_test di (gdbarch, insn, len);
 162
 163   SELF_CHECK (di.print_insn (0) == len);
 164 }
 165
 166 /* Test disassembly on memory error.  */
 167
 168 static void
 169 memory_error_test (struct gdbarch *gdbarch)
 170 {
 171   class gdb_disassembler_test : public gdb_disassembler
 172   {
 173   public:
 174     gdb_disassembler_test (struct gdbarch *gdbarch)
 175       : gdb_disassembler (gdbarch, &null_stream,
 176                           gdb_disassembler_test::read_memory)
 177     {
 178     }
 179
 180     static int read_memory (bfd_vma memaddr, gdb_byte *myaddr,
 181                             unsigned int len,
 182                             struct disassemble_info *info)
 183     {
 184       /* Always return an error.  */
 185       return -1;
 186     }
 187   };
 188
 189   gdb_disassembler_test di (gdbarch);
 190   bool saw_memory_error = false;
 191
 192   TRY
 193     {
 194       di.print_insn (0);
 195     }
 196   CATCH (ex, RETURN_MASK_ERROR)
 197     {
 198       if (ex.error == MEMORY_ERROR)
 199         saw_memory_error = true;
 200     }
 201   END_CATCH
 202
 203   /* Expect MEMORY_ERROR.  */
 204   SELF_CHECK (saw_memory_error);
 205 }
 206
 207 } // namespace selftests
 208 #endif /* GDB_SELF_TEST */
 209
 210 void
 211 _initialize_disasm_selftests (void)
 212 {
 213 #if GDB_SELF_TEST
 214   selftests::register_test_foreach_arch ("print_one_insn",
 215                                          selftests::print_one_insn_test);
 216   selftests::register_test_foreach_arch ("memory_error",
 217                                          selftests::memory_error_test);
 218 #endif
 219 }