opcodes/or32-dis.c

   1 /* Instruction printing code for the OpenRISC 1000
   2    Copyright (C) 2002, 2005, 2007 Free Software Foundation, Inc.
   3    Contributed by Damjan Lampret <lampret@opencores.org>.
   4    Modified from a29k port.
   5
   6    This file is part of the GNU opcodes library.
   7
   8    This library is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    It is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #define DEBUG 0
  24
  25 #include "dis-asm.h"
  26 #include "opcode/or32.h"
  27 #include "safe-ctype.h"
  28 #include <string.h>
  29 #include <stdlib.h>
  30
  31 #define EXTEND29(x) ((x) & (unsigned long) 0x10000000 ? ((x) | (unsigned long) 0xf0000000) : ((x)))
  32
  33 /* Now find the four bytes of INSN_CH and put them in *INSN.  */
  34
  35 static void
  36 find_bytes_big (unsigned char *insn_ch, unsigned long *insn)
  37 {
  38   *insn =
  39     ((unsigned long) insn_ch[0] << 24) +
  40     ((unsigned long) insn_ch[1] << 16) +
  41     ((unsigned long) insn_ch[2] << 8) +
  42     ((unsigned long) insn_ch[3]);
  43 #if DEBUG
  44   printf ("find_bytes_big3: %x\n", *insn);
  45 #endif
  46 }
  47
  48 static void
  49 find_bytes_little (unsigned char *insn_ch, unsigned long *insn)
  50 {
  51   *insn =
  52     ((unsigned long) insn_ch[3] << 24) +
  53     ((unsigned long) insn_ch[2] << 16) +
  54     ((unsigned long) insn_ch[1] << 8) +
  55     ((unsigned long) insn_ch[0]);
  56 }
  57
  58 typedef void (*find_byte_func_type) (unsigned char *, unsigned long *);
  59
  60 static unsigned long
  61 or32_extract (char param_ch, char *enc_initial, unsigned long insn)
  62 {
  63   char *enc;
  64   unsigned long ret = 0;
  65   int opc_pos = 0;
  66   int param_pos = 0;
  67
  68   for (enc = enc_initial; *enc != '\0'; enc++)
  69     if (*enc == param_ch)
  70       {
  71         if (enc - 2 >= enc_initial && (*(enc - 2) == '0') && (*(enc - 1) == 'x'))
  72           continue;
  73         else
  74           param_pos++;
  75       }
  76
  77 #if DEBUG
  78   printf ("or32_extract: %c %x ", param_ch, param_pos);
  79 #endif
  80   opc_pos = 32;
  81
  82   for (enc = enc_initial; *enc != '\0'; )
  83     if ((*enc == '0') && (*(enc + 1) == 'x'))
  84       {
  85         opc_pos -= 4;
  86
  87         if ((param_ch == '0') || (param_ch == '1'))
  88           {
  89             unsigned long tmp = strtoul (enc, NULL, 16);
  90 #if DEBUG
  91             printf (" enc=%s, tmp=%x ", enc, tmp);
  92 #endif
  93             if (param_ch == '0')
  94               tmp = 15 - tmp;
  95             ret |= tmp << opc_pos;
  96           }
  97         enc += 3;
  98       }
  99     else if ((*enc == '0') || (*enc == '1'))
 100       {
 101         opc_pos--;
 102         if (param_ch == *enc)
 103           ret |= 1 << opc_pos;
 104         enc++;
 105       }
 106     else if (*enc == param_ch)
 107       {
 108         opc_pos--;
 109         param_pos--;
 110 #if DEBUG
 111         printf ("\n  ret=%x opc_pos=%x, param_pos=%x\n", ret, opc_pos, param_pos);
 112 #endif
 113         ret += ((insn >> opc_pos) & 0x1) << param_pos;
 114
 115         if (!param_pos
 116             && letter_signed (param_ch)
 117             && ret >> (letter_range (param_ch) - 1))
 118           {
 119 #if DEBUG
 120             printf ("\n  ret=%x opc_pos=%x, param_pos=%x\n",
 121                     ret, opc_pos, param_pos);
 122 #endif
 123             ret |= 0xffffffff << letter_range(param_ch);
 124 #if DEBUG
 125             printf ("\n  after conversion to signed: ret=%x\n", ret);
 126 #endif
 127           }
 128         enc++;
 129       }
 130     else if (ISALPHA (*enc))
 131       {
 132         opc_pos--;
 133         enc++;
 134       }
 135     else if (*enc == '-')
 136       {
 137         opc_pos--;
 138         enc++;
 139       }
 140     else
 141       enc++;
 142
 143 #if DEBUG
 144   printf ("ret=%x\n", ret);
 145 #endif
 146   return ret;
 147 }
 148
 149 static int
 150 or32_opcode_match (unsigned long insn, char *encoding)
 151 {
 152   unsigned long ones, zeros;
 153
 154 #if DEBUG
 155   printf ("or32_opcode_match: %.8lx\n", insn);
 156 #endif
 157   ones  = or32_extract ('1', encoding, insn);
 158   zeros = or32_extract ('0', encoding, insn);
 159
 160 #if DEBUG
 161   printf ("ones: %x \n", ones);
 162   printf ("zeros: %x \n", zeros);
 163 #endif
 164   if ((insn & ones) != ones)
 165     {
 166 #if DEBUG
 167       printf ("ret1\n");
 168 #endif
 169       return 0;
 170     }
 171
 172   if ((~insn & zeros) != zeros)
 173     {
 174 #if DEBUG
 175       printf ("ret2\n");
 176 #endif
 177       return 0;
 178     }
 179
 180 #if DEBUG
 181   printf ("ret3\n");
 182 #endif
 183   return 1;
 184 }
 185
 186 /* Print register to INFO->STREAM. Used only by print_insn.  */
 187
 188 static void
 189 or32_print_register (char param_ch,
 190                      char *encoding,
 191                      unsigned long insn,
 192                      struct disassemble_info *info)
 193 {
 194   int regnum = or32_extract (param_ch, encoding, insn);
 195
 196 #if DEBUG
 197   printf ("or32_print_register: %c, %s, %x\n", param_ch, encoding, insn);
 198 #endif
 199   if (param_ch == 'A')
 200     (*info->fprintf_func) (info->stream, "r%d", regnum);
 201   else if (param_ch == 'B')
 202     (*info->fprintf_func) (info->stream, "r%d", regnum);
 203   else if (param_ch == 'D')
 204     (*info->fprintf_func) (info->stream, "r%d", regnum);
 205   else if (regnum < 16)
 206     (*info->fprintf_func) (info->stream, "r%d", regnum);
 207   else if (regnum < 32)
 208     (*info->fprintf_func) (info->stream, "r%d", regnum-16);
 209   else
 210     (*info->fprintf_func) (info->stream, "X%d", regnum);
 211 }
 212
 213 /* Print immediate to INFO->STREAM. Used only by print_insn.  */
 214
 215 static void
 216 or32_print_immediate (char param_ch,
 217                       char *encoding,
 218                       unsigned long insn,
 219                       struct disassemble_info *info)
 220 {
 221   int imm = or32_extract(param_ch, encoding, insn);
 222
 223   if (letter_signed(param_ch))
 224     (*info->fprintf_func) (info->stream, "0x%x", imm);
 225 /*    (*info->fprintf_func) (info->stream, "%d", imm); */
 226   else
 227     (*info->fprintf_func) (info->stream, "0x%x", imm);
 228 }
 229
 230 /* Print one instruction from MEMADDR on INFO->STREAM.
 231    Return the size of the instruction (always 4 on or32).  */
 232
 233 static int
 234 print_insn (bfd_vma memaddr, struct disassemble_info *info)
 235 {
 236   /* The raw instruction.  */
 237   unsigned char insn_ch[4];
 238   /* Address. Will be sign extened 27-bit.  */
 239   unsigned long addr;
 240   /* The four bytes of the instruction.  */
 241   unsigned long insn;
 242   find_byte_func_type find_byte_func = (find_byte_func_type) info->private_data;
 243   struct or32_opcode const * opcode;
 244
 245   {
 246     int status =
 247       (*info->read_memory_func) (memaddr, (bfd_byte *) &insn_ch[0], 4, info);
 248
 249     if (status != 0)
 250       {
 251         (*info->memory_error_func) (status, memaddr, info);
 252         return -1;
 253       }
 254   }
 255
 256   (*find_byte_func) (&insn_ch[0], &insn);
 257
 258   for (opcode = &or32_opcodes[0];
 259        opcode < &or32_opcodes[or32_num_opcodes];
 260        ++opcode)
 261     {
 262       if (or32_opcode_match (insn, opcode->encoding))
 263         {
 264           char *s;
 265
 266           (*info->fprintf_func) (info->stream, "%s ", opcode->name);
 267
 268           for (s = opcode->args; *s != '\0'; ++s)
 269             {
 270               switch (*s)
 271                 {
 272                 case '\0':
 273                   return 4;
 274
 275                 case 'r':
 276                   or32_print_register (*++s, opcode->encoding, insn, info);
 277                   break;
 278
 279                 case 'X':
 280                   addr = or32_extract ('X', opcode->encoding, insn) << 2;
 281
 282                   /* Calulate the correct address.  XXX is this really correct ??  */
 283                   addr = memaddr + EXTEND29 (addr);
 284
 285                   (*info->print_address_func)
 286                     (addr, info);
 287                   break;
 288
 289                 default:
 290                   if (strchr (opcode->encoding, *s))
 291                     or32_print_immediate (*s, opcode->encoding, insn, info);
 292                   else
 293                     (*info->fprintf_func) (info->stream, "%c", *s);
 294                 }
 295             }
 296
 297           return 4;
 298         }
 299     }
 300
 301   /* This used to be %8x for binutils.  */
 302   (*info->fprintf_func)
 303     (info->stream, ".word 0x%08lx", insn);
 304   return 4;
 305 }
 306
 307 /* Disassemble a big-endian or32 instruction.  */
 308
 309 int
 310 print_insn_big_or32 (bfd_vma memaddr, struct disassemble_info *info)
 311 {
 312   info->private_data = find_bytes_big;
 313
 314   return print_insn (memaddr, info);
 315 }
 316
 317 /* Disassemble a little-endian or32 instruction.  */
 318
 319 int
 320 print_insn_little_or32 (bfd_vma memaddr, struct disassemble_info *info)
 321 {
 322   info->private_data = find_bytes_little;
 323   return print_insn (memaddr, info);
 324 }