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 #ifndef DEBUG
  24 #define DEBUG 0
  25 #endif
  26
  27 #include "dis-asm.h"
  28 #include "opcode/or32.h"
  29 #include "safe-ctype.h"
  30 #include <string.h>
  31 #include <stdlib.h>
  32
  33 #define EXTEND29(x) ((x) & (unsigned long) 0x10000000 ? ((x) | (unsigned long) 0xf0000000) : ((x)))
  34
  35 /* Now find the four bytes of INSN_CH and put them in *INSN.  */
  36
  37 static void
  38 find_bytes_big (unsigned char *insn_ch, unsigned long *insn)
  39 {
  40   *insn =
  41     ((unsigned long) insn_ch[0] << 24) +
  42     ((unsigned long) insn_ch[1] << 16) +
  43     ((unsigned long) insn_ch[2] << 8) +
  44     ((unsigned long) insn_ch[3]);
  45 #if DEBUG
  46   printf ("find_bytes_big3: %lx\n", *insn);
  47 #endif
  48 }
  49
  50 static void
  51 find_bytes_little (unsigned char *insn_ch, unsigned long *insn)
  52 {
  53   *insn =
  54     ((unsigned long) insn_ch[3] << 24) +
  55     ((unsigned long) insn_ch[2] << 16) +
  56     ((unsigned long) insn_ch[1] << 8) +
  57     ((unsigned long) insn_ch[0]);
  58 }
  59
  60 typedef void (*find_byte_func_type) (unsigned char *, unsigned long *);
  61
  62 static unsigned long
  63 or32_extract (char param_ch, char *enc_initial, unsigned long insn)
  64 {
  65   char *enc;
  66   unsigned long ret = 0;
  67   int opc_pos = 0;
  68   int param_pos = 0;
  69
  70   for (enc = enc_initial; *enc != '\0'; enc++)
  71     if (*enc == param_ch)
  72       {
  73         if (enc - 2 >= enc_initial && (*(enc - 2) == '0') && (*(enc - 1) == 'x'))
  74           continue;
  75         else
  76           param_pos++;
  77       }
  78
  79 #if DEBUG
  80   printf ("or32_extract: %c %x ", param_ch, param_pos);
  81 #endif
  82   opc_pos = 32;
  83
  84   for (enc = enc_initial; *enc != '\0'; )
  85     if ((*enc == '0') && (*(enc + 1) == 'x'))
  86       {
  87         opc_pos -= 4;
  88
  89         if ((param_ch == '0') || (param_ch == '1'))
  90           {
  91             unsigned long tmp = strtoul (enc, NULL, 16);
  92 #if DEBUG
  93             printf (" enc=%s, tmp=%lx ", enc, tmp);
  94 #endif
  95             if (param_ch == '0')
  96               tmp = 15 - tmp;
  97             ret |= tmp << opc_pos;
  98           }
  99         enc += 3;
 100       }
 101     else if ((*enc == '0') || (*enc == '1'))
 102       {
 103         opc_pos--;
 104         if (param_ch == *enc)
 105           ret |= 1 << opc_pos;
 106         enc++;
 107       }
 108     else if (*enc == param_ch)
 109       {
 110         opc_pos--;
 111         param_pos--;
 112 #if DEBUG
 113         printf ("\n  ret=%lx opc_pos=%x, param_pos=%x\n", ret, opc_pos, param_pos);
 114 #endif
 115         ret += ((insn >> opc_pos) & 0x1) << param_pos;
 116
 117         if (!param_pos
 118             && letter_signed (param_ch)
 119             && ret >> (letter_range (param_ch) - 1))
 120           {
 121 #if DEBUG
 122             printf ("\n  ret=%lx opc_pos=%x, param_pos=%x\n",
 123                     ret, opc_pos, param_pos);
 124 #endif
 125             ret |= 0xffffffff << letter_range(param_ch);
 126 #if DEBUG
 127             printf ("\n  after conversion to signed: ret=%lx\n", ret);
 128 #endif
 129           }
 130         enc++;
 131       }
 132     else if (ISALPHA (*enc))
 133       {
 134         opc_pos--;
 135         enc++;
 136       }
 137     else if (*enc == '-')
 138       {
 139         opc_pos--;
 140         enc++;
 141       }
 142     else
 143       enc++;
 144
 145 #if DEBUG
 146   printf ("ret=%lx\n", ret);
 147 #endif
 148   return ret;
 149 }
 150
 151 static int
 152 or32_opcode_match (unsigned long insn, char *encoding)
 153 {
 154   unsigned long ones, zeros;
 155
 156 #if DEBUG
 157   printf ("or32_opcode_match: %.8lx\n", insn);
 158 #endif
 159   ones  = or32_extract ('1', encoding, insn);
 160   zeros = or32_extract ('0', encoding, insn);
 161
 162 #if DEBUG
 163   printf ("ones: %lx \n", ones);
 164   printf ("zeros: %lx \n", zeros);
 165 #endif
 166   if ((insn & ones) != ones)
 167     {
 168 #if DEBUG
 169       printf ("ret1\n");
 170 #endif
 171       return 0;
 172     }
 173
 174   if ((~insn & zeros) != zeros)
 175     {
 176 #if DEBUG
 177       printf ("ret2\n");
 178 #endif
 179       return 0;
 180     }
 181
 182 #if DEBUG
 183   printf ("ret3\n");
 184 #endif
 185   return 1;
 186 }
 187
 188 /* Print register to INFO->STREAM. Used only by print_insn.  */
 189
 190 static void
 191 or32_print_register (char param_ch,
 192                      char *encoding,
 193                      unsigned long insn,
 194                      struct disassemble_info *info)
 195 {
 196   int regnum = or32_extract (param_ch, encoding, insn);
 197
 198 #if DEBUG
 199   printf ("or32_print_register: %c, %s, %lx\n", param_ch, encoding, insn);
 200 #endif
 201   if (param_ch == 'A')
 202     (*info->fprintf_func) (info->stream, "r%d", regnum);
 203   else if (param_ch == 'B')
 204     (*info->fprintf_func) (info->stream, "r%d", regnum);
 205   else if (param_ch == 'D')
 206     (*info->fprintf_func) (info->stream, "r%d", regnum);
 207   else if (regnum < 16)
 208     (*info->fprintf_func) (info->stream, "r%d", regnum);
 209   else if (regnum < 32)
 210     (*info->fprintf_func) (info->stream, "r%d", regnum-16);
 211   else
 212     (*info->fprintf_func) (info->stream, "X%d", regnum);
 213 }
 214
 215 /* Print immediate to INFO->STREAM. Used only by print_insn.  */
 216
 217 static void
 218 or32_print_immediate (char param_ch,
 219                       char *encoding,
 220                       unsigned long insn,
 221                       struct disassemble_info *info)
 222 {
 223   int imm = or32_extract(param_ch, encoding, insn);
 224
 225   if (letter_signed(param_ch))
 226     (*info->fprintf_func) (info->stream, "0x%x", imm);
 227 /*    (*info->fprintf_func) (info->stream, "%d", imm); */
 228   else
 229     (*info->fprintf_func) (info->stream, "0x%x", imm);
 230 }
 231
 232 /* Print one instruction from MEMADDR on INFO->STREAM.
 233    Return the size of the instruction (always 4 on or32).  */
 234
 235 static int
 236 print_insn (bfd_vma memaddr, struct disassemble_info *info)
 237 {
 238   /* The raw instruction.  */
 239   unsigned char insn_ch[4];
 240   /* Address. Will be sign extened 27-bit.  */
 241   unsigned long addr;
 242   /* The four bytes of the instruction.  */
 243   unsigned long insn;
 244   find_byte_func_type find_byte_func = (find_byte_func_type) info->private_data;
 245   struct or32_opcode const * opcode;
 246
 247   {
 248     int status =
 249       (*info->read_memory_func) (memaddr, (bfd_byte *) &insn_ch[0], 4, info);
 250
 251     if (status != 0)
 252       {
 253         (*info->memory_error_func) (status, memaddr, info);
 254         return -1;
 255       }
 256   }
 257
 258   (*find_byte_func) (&insn_ch[0], &insn);
 259
 260   for (opcode = &or32_opcodes[0];
 261        opcode < &or32_opcodes[or32_num_opcodes];
 262        ++opcode)
 263     {
 264       if (or32_opcode_match (insn, opcode->encoding))
 265         {
 266           char *s;
 267
 268           (*info->fprintf_func) (info->stream, "%s ", opcode->name);
 269
 270           for (s = opcode->args; *s != '\0'; ++s)
 271             {
 272               switch (*s)
 273                 {
 274                 case '\0':
 275                   return 4;
 276
 277                 case 'r':
 278                   or32_print_register (*++s, opcode->encoding, insn, info);
 279                   break;
 280
 281                 case 'X':
 282                   addr = or32_extract ('X', opcode->encoding, insn) << 2;
 283
 284                   /* Calulate the correct address.  XXX is this really correct ??  */
 285                   addr = memaddr + EXTEND29 (addr);
 286
 287                   (*info->print_address_func)
 288                     (addr, info);
 289                   break;
 290
 291                 default:
 292                   if (strchr (opcode->encoding, *s))
 293                     or32_print_immediate (*s, opcode->encoding, insn, info);
 294                   else
 295                     (*info->fprintf_func) (info->stream, "%c", *s);
 296                 }
 297             }
 298
 299           return 4;
 300         }
 301     }
 302
 303   /* This used to be %8x for binutils.  */
 304   (*info->fprintf_func)
 305     (info->stream, ".word 0x%08lx", insn);
 306   return 4;
 307 }
 308
 309 /* Disassemble a big-endian or32 instruction.  */
 310
 311 int
 312 print_insn_big_or32 (bfd_vma memaddr, struct disassemble_info *info)
 313 {
 314   info->private_data = find_bytes_big;
 315
 316   return print_insn (memaddr, info);
 317 }
 318
 319 /* Disassemble a little-endian or32 instruction.  */
 320
 321 int
 322 print_insn_little_or32 (bfd_vma memaddr, struct disassemble_info *info)
 323 {
 324   info->private_data = find_bytes_little;
 325   return print_insn (memaddr, info);
 326 }