opcodes/s12z-dis.c

   1 /* s12z-dis.c -- Freescale S12Z disassembly
   2    Copyright (C) 2018-2022 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU opcodes library.
   5
   6    This library is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    It is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include <stdio.h>
  23 #include <stdint.h>
  24 #include <stdbool.h>
  25 #include <assert.h>
  26
  27 #include "opcode/s12z.h"
  28 #include "bfd.h"
  29 #include "dis-asm.h"
  30 #include "disassemble.h"
  31 #include "s12z-opc.h"
  32 #include "opintl.h"
  33
  34 struct mem_read_abstraction
  35 {
  36   struct mem_read_abstraction_base base;
  37   bfd_vma memaddr;
  38   struct disassemble_info* info;
  39 };
  40
  41 static void
  42 advance (struct mem_read_abstraction_base *b)
  43 {
  44   struct mem_read_abstraction *mra = (struct mem_read_abstraction *) b;
  45   mra->memaddr ++;
  46 }
  47
  48 static bfd_vma
  49 posn (struct mem_read_abstraction_base *b)
  50 {
  51   struct mem_read_abstraction *mra = (struct mem_read_abstraction *) b;
  52   return mra->memaddr;
  53 }
  54
  55 static int
  56 abstract_read_memory (struct mem_read_abstraction_base *b,
  57                       int offset,
  58                       size_t n, bfd_byte *bytes)
  59 {
  60   struct mem_read_abstraction *mra = (struct mem_read_abstraction *) b;
  61
  62   int status = (*mra->info->read_memory_func) (mra->memaddr + offset,
  63                                                bytes, n, mra->info);
  64   if (status != 0)
  65     (*mra->info->memory_error_func) (status, mra->memaddr + offset,
  66                                      mra->info);
  67   return status != 0 ? -1 : 0;
  68 }
  69
  70 /* Start of disassembly file.  */
  71 const struct reg registers[S12Z_N_REGISTERS] =
  72   {
  73     {"d2", 2},
  74     {"d3", 2},
  75     {"d4", 2},
  76     {"d5", 2},
  77
  78     {"d0", 1},
  79     {"d1", 1},
  80
  81     {"d6", 4},
  82     {"d7", 4},
  83
  84     {"x", 3},
  85     {"y", 3},
  86     {"s", 3},
  87     {"p", 3},
  88     {"cch", 1},
  89     {"ccl", 1},
  90     {"ccw", 2}
  91   };
  92
  93 static const char *mnemonics[] =
  94   {
  95     "!!invalid!!",
  96     "psh",
  97     "pul",
  98     "tbne", "tbeq", "tbpl", "tbmi", "tbgt", "tble",
  99     "dbne", "dbeq", "dbpl", "dbmi", "dbgt", "dble",
 100     "sex",
 101     "exg",
 102     "lsl", "lsr",
 103     "asl", "asr",
 104     "rol", "ror",
 105     "bfins", "bfext",
 106
 107     "trap",
 108
 109     "ld",
 110     "st",
 111     "cmp",
 112
 113     "stop",
 114     "wai",
 115     "sys",
 116
 117     "minu",
 118     "mins",
 119     "maxu",
 120     "maxs",
 121
 122     "abs",
 123     "adc",
 124     "bit",
 125     "sbc",
 126     "rti",
 127     "clb",
 128     "eor",
 129
 130     "sat",
 131
 132     "nop",
 133     "bgnd",
 134     "brclr",
 135     "brset",
 136     "rts",
 137     "lea",
 138     "mov",
 139
 140     "bra",
 141     "bsr",
 142     "bhi",
 143     "bls",
 144     "bcc",
 145     "bcs",
 146     "bne",
 147     "beq",
 148     "bvc",
 149     "bvs",
 150     "bpl",
 151     "bmi",
 152     "bge",
 153     "blt",
 154     "bgt",
 155     "ble",
 156     "inc",
 157     "clr",
 158     "dec",
 159
 160     "add",
 161     "sub",
 162     "and",
 163     "or",
 164
 165     "tfr",
 166     "jmp",
 167     "jsr",
 168     "com",
 169     "andcc",
 170     "neg",
 171     "orcc",
 172     "bclr",
 173     "bset",
 174     "btgl",
 175     "swi",
 176
 177     "mulu",
 178     "divu",
 179     "modu",
 180     "macu",
 181     "qmulu",
 182
 183     "muls",
 184     "divs",
 185     "mods",
 186     "macs",
 187     "qmuls",
 188
 189     NULL
 190   };
 191
 192
 193 static void
 194 operand_separator (struct disassemble_info *info)
 195 {
 196   if ((info->flags & 0x2))
 197     (*info->fprintf_func) (info->stream, ",");
 198
 199   (*info->fprintf_func) (info->stream, " ");
 200
 201   info->flags |= 0x2;
 202 }
 203
 204 /* Render the symbol name whose value is ADDR + BASE or the adddress itself if
 205    there is no symbol.  If BASE is non zero, then the a PC relative adddress is
 206    assumend (ie BASE is the value in the PC.  */
 207 static void
 208 decode_possible_symbol (bfd_vma addr, bfd_vma base,
 209                         struct disassemble_info *info, bool relative)
 210 {
 211   const char *fmt = relative  ? "*%+" BFD_VMA_FMT "d" : "%" BFD_VMA_FMT "d";
 212   asymbol *sym = info->symbol_at_address_func (addr + base, info);
 213
 214   if (!sym)
 215     (*info->fprintf_func) (info->stream, fmt, addr);
 216   else
 217     (*info->fprintf_func) (info->stream, "%s", bfd_asymbol_name (sym));
 218 }
 219
 220
 221 /* Emit the disassembled text for OPR */
 222 static void
 223 opr_emit_disassembly (const struct operand *opr,
 224                       struct disassemble_info *info)
 225 {
 226   operand_separator (info);
 227
 228   switch (opr->cl)
 229     {
 230     case OPND_CL_IMMEDIATE:
 231       (*info->fprintf_func) (info->stream, "#%d",
 232                              ((struct immediate_operand *) opr)->value);
 233       break;
 234     case OPND_CL_REGISTER:
 235       {
 236         int r = ((struct register_operand*) opr)->reg;
 237
 238         if (r < 0 || r >= S12Z_N_REGISTERS)
 239           (*info->fprintf_func) (info->stream, _("<illegal reg num>"));
 240         else
 241           (*info->fprintf_func) (info->stream, "%s", registers[r].name);
 242       }
 243       break;
 244     case OPND_CL_REGISTER_ALL16:
 245       (*info->fprintf_func) (info->stream, "%s", "ALL16b");
 246       break;
 247     case OPND_CL_REGISTER_ALL:
 248       (*info->fprintf_func) (info->stream, "%s", "ALL");
 249       break;
 250     case OPND_CL_BIT_FIELD:
 251       (*info->fprintf_func) (info->stream, "#%d:%d",
 252                              ((struct bitfield_operand*)opr)->width,
 253                              ((struct bitfield_operand*)opr)->offset);
 254       break;
 255     case OPND_CL_SIMPLE_MEMORY:
 256       {
 257         struct simple_memory_operand *mo =
 258           (struct simple_memory_operand *) opr;
 259         decode_possible_symbol (mo->addr, mo->base, info, mo->relative);
 260       }
 261       break;
 262     case OPND_CL_MEMORY:
 263       {
 264         int used_reg = 0;
 265         struct memory_operand *mo = (struct memory_operand *) opr;
 266         (*info->fprintf_func) (info->stream, "%c", mo->indirect ? '[' : '(');
 267
 268         const char *fmt;
 269         assert (mo->mutation == OPND_RM_NONE || mo->n_regs == 1);
 270         switch (mo->mutation)
 271           {
 272           case OPND_RM_PRE_DEC:
 273             fmt = "-%s";
 274             break;
 275           case OPND_RM_PRE_INC:
 276             fmt = "+%s";
 277             break;
 278           case OPND_RM_POST_DEC:
 279             fmt = "%s-";
 280             break;
 281           case OPND_RM_POST_INC:
 282             fmt = "%s+";
 283             break;
 284           case OPND_RM_NONE:
 285           default:
 286             if (mo->n_regs < 2)
 287               (*info->fprintf_func) (info->stream, (mo->n_regs == 0) ? "%d" : "%d,", mo->base_offset);
 288             fmt = "%s";
 289             break;
 290           }
 291         if (mo->n_regs > 0)
 292           {
 293             int r = mo->regs[0];
 294
 295             if (r < 0 || r >= S12Z_N_REGISTERS)
 296               (*info->fprintf_func) (info->stream, fmt, _("<illegal reg num>"));
 297             else
 298               (*info->fprintf_func) (info->stream, fmt, registers[r].name);
 299           }
 300         used_reg = 1;
 301
 302         if (mo->n_regs > used_reg)
 303           {
 304             int r = mo->regs[used_reg];
 305
 306             if (r < 0 || r >= S12Z_N_REGISTERS)
 307               (*info->fprintf_func) (info->stream, _("<illegal reg num>"));
 308             else
 309               (*info->fprintf_func) (info->stream, ",%s",
 310                                      registers[r].name);
 311           }
 312
 313         (*info->fprintf_func) (info->stream, "%c",
 314                                mo->indirect ? ']' : ')');
 315       }
 316       break;
 317     };
 318 }
 319
 320 #define S12Z_N_SIZES 4
 321 static const char shift_size_table[S12Z_N_SIZES] =
 322 {
 323   'b', 'w', 'p', 'l'
 324 };
 325
 326 int
 327 print_insn_s12z (bfd_vma memaddr, struct disassemble_info* info)
 328 {
 329   int o;
 330   enum optr operator = OP_INVALID;
 331   int n_operands = 0;
 332
 333   /* The longest instruction in S12Z can have 6 operands.
 334      (Most have 3 or less.  Only PSH and PUL have so many.  */
 335   struct operand *operands[6];
 336
 337   struct mem_read_abstraction mra;
 338   mra.base.read = (void *) abstract_read_memory ;
 339   mra.base.advance = advance ;
 340   mra.base.posn = posn;
 341   mra.memaddr = memaddr;
 342   mra.info = info;
 343
 344   short osize = -1;
 345   int n_bytes =
 346     decode_s12z (&operator, &osize, &n_operands, operands,
 347                  (struct mem_read_abstraction_base *) &mra);
 348
 349   (info->fprintf_func) (info->stream, "%s", mnemonics[(long)operator]);
 350
 351   /* Ship out size sufficies for those instructions which
 352      need them.  */
 353   if (osize == -1)
 354     {
 355       bool suffix = false;
 356
 357       for (o = 0; o < n_operands; ++o)
 358         {
 359           if (operands[o] && operands[o]->osize != -1)
 360             {
 361               if (!suffix)
 362                 {
 363                   (*mra.info->fprintf_func) (mra.info->stream, "%c", '.');
 364                   suffix = true;
 365                 }
 366
 367               osize = operands[o]->osize;
 368
 369               if (osize < 0 || osize >= S12Z_N_SIZES)
 370                 (*mra.info->fprintf_func) (mra.info->stream, _("<bad>"));
 371               else
 372                 (*mra.info->fprintf_func) (mra.info->stream, "%c",
 373                                            shift_size_table[osize]);
 374             }
 375         }
 376     }
 377   else
 378     {
 379       if (osize < 0 || osize >= S12Z_N_SIZES)
 380         (*mra.info->fprintf_func) (mra.info->stream, _(".<bad>"));
 381       else
 382         (*mra.info->fprintf_func) (mra.info->stream, ".%c",
 383                                    shift_size_table[osize]);
 384     }
 385
 386   /* Ship out the operands.  */
 387   for (o = 0; o < n_operands; ++o)
 388     {
 389       if (operands[o])
 390         opr_emit_disassembly (operands[o], mra.info);
 391       free (operands[o]);
 392     }
 393
 394   return n_bytes;
 395 }