opcodes/avr-dis.c

   1 /* Disassemble AVR instructions.
   2    Copyright 1999, 2000, 2002, 2004, 2005, 2006
   3    Free Software Foundation, Inc.
   4
   5    Contributed by Denis Chertykov <denisc@overta.ru>
   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 2 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, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 #include <assert.h>
  22 #include "sysdep.h"
  23 #include "dis-asm.h"
  24 #include "opintl.h"
  25 #include "libiberty.h"
  26
  27 struct avr_opcodes_s
  28 {
  29   char *name;
  30   char *constraints;
  31   char *opcode;
  32   int insn_size;                /* In words.  */
  33   int isa;
  34   unsigned int bin_opcode;
  35 };
  36
  37 #define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \
  38 {#NAME, CONSTR, OPCODE, SIZE, ISA, BIN},
  39
  40 const struct avr_opcodes_s avr_opcodes[] =
  41 {
  42   #include "opcode/avr.h"
  43   {NULL, NULL, NULL, 0, 0, 0}
  44 };
  45
  46 static const char * comment_start = "0x";
  47
  48 static int
  49 avr_operand (unsigned int insn, unsigned int insn2, unsigned int pc, int constraint,
  50              char *buf, char *comment, int regs, int *sym, bfd_vma *sym_addr)
  51 {
  52   int ok = 1;
  53   *sym = 0;
  54
  55   switch (constraint)
  56     {
  57       /* Any register operand.  */
  58     case 'r':
  59       if (regs)
  60         insn = (insn & 0xf) | ((insn & 0x0200) >> 5); /* Source register.  */
  61       else
  62         insn = (insn & 0x01f0) >> 4; /* Destination register.  */
  63
  64       sprintf (buf, "r%d", insn);
  65       break;
  66
  67     case 'd':
  68       if (regs)
  69         sprintf (buf, "r%d", 16 + (insn & 0xf));
  70       else
  71         sprintf (buf, "r%d", 16 + ((insn & 0xf0) >> 4));
  72       break;
  73
  74     case 'w':
  75       sprintf (buf, "r%d", 24 + ((insn & 0x30) >> 3));
  76       break;
  77
  78     case 'a':
  79       if (regs)
  80         sprintf (buf, "r%d", 16 + (insn & 7));
  81       else
  82         sprintf (buf, "r%d", 16 + ((insn >> 4) & 7));
  83       break;
  84
  85     case 'v':
  86       if (regs)
  87         sprintf (buf, "r%d", (insn & 0xf) * 2);
  88       else
  89         sprintf (buf, "r%d", ((insn & 0xf0) >> 3));
  90       break;
  91
  92     case 'e':
  93       {
  94         char *xyz;
  95
  96         switch (insn & 0x100f)
  97           {
  98             case 0x0000: xyz = "Z";  break;
  99             case 0x1001: xyz = "Z+"; break;
 100             case 0x1002: xyz = "-Z"; break;
 101             case 0x0008: xyz = "Y";  break;
 102             case 0x1009: xyz = "Y+"; break;
 103             case 0x100a: xyz = "-Y"; break;
 104             case 0x100c: xyz = "X";  break;
 105             case 0x100d: xyz = "X+"; break;
 106             case 0x100e: xyz = "-X"; break;
 107             default: xyz = "??"; ok = 0;
 108           }
 109         sprintf (buf, xyz);
 110
 111         if (AVR_UNDEF_P (insn))
 112           sprintf (comment, _("undefined"));
 113       }
 114       break;
 115
 116     case 'z':
 117       *buf++ = 'Z';
 118       if (insn & 0x1)
 119         *buf++ = '+';
 120       *buf = '\0';
 121       if (AVR_UNDEF_P (insn))
 122         sprintf (comment, _("undefined"));
 123       break;
 124
 125     case 'b':
 126       {
 127         unsigned int x;
 128
 129         x = (insn & 7);
 130         x |= (insn >> 7) & (3 << 3);
 131         x |= (insn >> 8) & (1 << 5);
 132
 133         if (insn & 0x8)
 134           *buf++ = 'Y';
 135         else
 136           *buf++ = 'Z';
 137         sprintf (buf, "+%d", x);
 138         sprintf (comment, "0x%02x", x);
 139       }
 140       break;
 141
 142     case 'h':
 143       *sym = 1;
 144       *sym_addr = ((((insn & 1) | ((insn & 0x1f0) >> 3)) << 16) | insn2) * 2;
 145       /* See PR binutils/2454.  Ideally we would like to display the hex
 146          value of the address only once, but this would mean recoding
 147          objdump_print_address() which would affect many targets.  */
 148       sprintf (buf, "%#lx", (unsigned long) *sym_addr);
 149       sprintf (comment, comment_start);
 150       break;
 151
 152     case 'L':
 153       {
 154         int rel_addr = (((insn & 0xfff) ^ 0x800) - 0x800) * 2;
 155         sprintf (buf, ".%+-8d", rel_addr);
 156         *sym = 1;
 157         *sym_addr = pc + 2 + rel_addr;
 158         sprintf (comment, comment_start);
 159       }
 160       break;
 161
 162     case 'l':
 163       {
 164         int rel_addr = ((((insn >> 3) & 0x7f) ^ 0x40) - 0x40) * 2;
 165
 166         sprintf (buf, ".%+-8d", rel_addr);
 167         *sym = 1;
 168         *sym_addr = pc + 2 + rel_addr;
 169         sprintf (comment, comment_start);
 170       }
 171       break;
 172
 173     case 'i':
 174       sprintf (buf, "0x%04X", insn2);
 175       break;
 176
 177     case 'M':
 178       sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf));
 179       sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf));
 180       break;
 181
 182     case 'n':
 183       sprintf (buf, "??");
 184       fprintf (stderr, _("Internal disassembler error"));
 185       ok = 0;
 186       break;
 187
 188     case 'K':
 189       {
 190         unsigned int x;
 191
 192         x = (insn & 0xf) | ((insn >> 2) & 0x30);
 193         sprintf (buf, "0x%02x", x);
 194         sprintf (comment, "%d", x);
 195       }
 196       break;
 197
 198     case 's':
 199       sprintf (buf, "%d", insn & 7);
 200       break;
 201
 202     case 'S':
 203       sprintf (buf, "%d", (insn >> 4) & 7);
 204       break;
 205
 206     case 'P':
 207       {
 208         unsigned int x;
 209
 210         x = (insn & 0xf);
 211         x |= (insn >> 5) & 0x30;
 212         sprintf (buf, "0x%02x", x);
 213         sprintf (comment, "%d", x);
 214       }
 215       break;
 216
 217     case 'p':
 218       {
 219         unsigned int x;
 220
 221         x = (insn >> 3) & 0x1f;
 222         sprintf (buf, "0x%02x", x);
 223         sprintf (comment, "%d", x);
 224       }
 225       break;
 226
 227     case '?':
 228       *buf = '\0';
 229       break;
 230
 231     default:
 232       sprintf (buf, "??");
 233       fprintf (stderr, _("unknown constraint `%c'"), constraint);
 234       ok = 0;
 235     }
 236
 237     return ok;
 238 }
 239
 240 static unsigned short
 241 avrdis_opcode (bfd_vma addr, disassemble_info *info)
 242 {
 243   bfd_byte buffer[2];
 244   int status;
 245
 246   status = info->read_memory_func (addr, buffer, 2, info);
 247
 248   if (status == 0)
 249     return bfd_getl16 (buffer);
 250
 251   info->memory_error_func (status, addr, info);
 252   return -1;
 253 }
 254
 255
 256 int
 257 print_insn_avr (bfd_vma addr, disassemble_info *info)
 258 {
 259   unsigned int insn, insn2;
 260   const struct avr_opcodes_s *opcode;
 261   static unsigned int *maskptr;
 262   void *stream = info->stream;
 263   fprintf_ftype prin = info->fprintf_func;
 264   static unsigned int *avr_bin_masks;
 265   static int initialized;
 266   int cmd_len = 2;
 267   int ok = 0;
 268   char op1[20], op2[20], comment1[40], comment2[40];
 269   int sym_op1 = 0, sym_op2 = 0;
 270   bfd_vma sym_addr1, sym_addr2;
 271
 272
 273   if (!initialized)
 274     {
 275       unsigned int nopcodes;
 276
 277       /* PR 4045: Try to avoid duplicating the 0x prefix that
 278          objdump_print_addr() will put on addresses when there
 279          is no symbol table available.  */
 280       if (info->symtab_size == 0)
 281         comment_start = " ";
 282
 283       nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s);
 284
 285       avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int));
 286
 287       for (opcode = avr_opcodes, maskptr = avr_bin_masks;
 288            opcode->name;
 289            opcode++, maskptr++)
 290         {
 291           char * s;
 292           unsigned int bin = 0;
 293           unsigned int mask = 0;
 294
 295           for (s = opcode->opcode; *s; ++s)
 296             {
 297               bin <<= 1;
 298               mask <<= 1;
 299               bin |= (*s == '1');
 300               mask |= (*s == '1' || *s == '0');
 301             }
 302           assert (s - opcode->opcode == 16);
 303           assert (opcode->bin_opcode == bin);
 304           *maskptr = mask;
 305         }
 306
 307       initialized = 1;
 308     }
 309
 310   insn = avrdis_opcode (addr, info);
 311
 312   for (opcode = avr_opcodes, maskptr = avr_bin_masks;
 313        opcode->name;
 314        opcode++, maskptr++)
 315     if ((insn & *maskptr) == opcode->bin_opcode)
 316       break;
 317
 318   /* Special case: disassemble `ldd r,b+0' as `ld r,b', and
 319      `std b+0,r' as `st b,r' (next entry in the table).  */
 320
 321   if (AVR_DISP0_P (insn))
 322     opcode++;
 323
 324   op1[0] = 0;
 325   op2[0] = 0;
 326   comment1[0] = 0;
 327   comment2[0] = 0;
 328
 329   if (opcode->name)
 330     {
 331       char *op = opcode->constraints;
 332
 333       insn2 = 0;
 334       ok = 1;
 335
 336       if (opcode->insn_size > 1)
 337         {
 338           insn2 = avrdis_opcode (addr + 2, info);
 339           cmd_len = 4;
 340         }
 341
 342       if (*op && *op != '?')
 343         {
 344           int regs = REGISTER_P (*op);
 345
 346           ok = avr_operand (insn, insn2, addr, *op, op1, comment1, 0, &sym_op1, &sym_addr1);
 347
 348           if (ok && *(++op) == ',')
 349             ok = avr_operand (insn, insn2, addr, *(++op), op2,
 350                               *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2);
 351         }
 352     }
 353
 354   if (!ok)
 355     {
 356       /* Unknown opcode, or invalid combination of operands.  */
 357       sprintf (op1, "0x%04x", insn);
 358       op2[0] = 0;
 359       sprintf (comment1, "????");
 360       comment2[0] = 0;
 361     }
 362
 363   (*prin) (stream, "%s", ok ? opcode->name : ".word");
 364
 365   if (*op1)
 366       (*prin) (stream, "\t%s", op1);
 367
 368   if (*op2)
 369     (*prin) (stream, ", %s", op2);
 370
 371   if (*comment1)
 372     (*prin) (stream, "\t; %s", comment1);
 373
 374   if (sym_op1)
 375     info->print_address_func (sym_addr1, info);
 376
 377   if (*comment2)
 378     (*prin) (stream, " %s", comment2);
 379
 380   if (sym_op2)
 381     info->print_address_func (sym_addr2, info);
 382
 383   return cmd_len;
 384 }