opcodes/sh-dis.c

   1 /* Disassemble SH instructions.
   2    Copyright (C) 1993, 1995 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #include <stdio.h>
  19 #define STATIC_TABLE
  20 #define DEFINE_TABLE
  21
  22 #include "sh-opc.h"
  23 #include "dis-asm.h"
  24
  25 #define LITTLE_BIT 2
  26
  27 static int
  28 print_insn_shx(memaddr, info)
  29      bfd_vma memaddr;
  30      struct disassemble_info *info;
  31 {
  32   fprintf_ftype fprintf = info->fprintf_func;
  33   void *stream = info->stream;
  34   unsigned  char insn[2];
  35   unsigned  char nibs[4];
  36   int status;
  37   int relmask = ~0;
  38   sh_opcode_info *op;
  39
  40   status = info->read_memory_func(memaddr, insn, 2, info);
  41
  42   if (status != 0)
  43     {
  44       info->memory_error_func(status, memaddr, info);
  45       return -1;
  46     }
  47
  48
  49
  50   if (info->flags & LITTLE_BIT)
  51     {
  52       nibs[0] = (insn[1] >> 4) & 0xf;
  53       nibs[1] = insn[1] & 0xf;
  54
  55       nibs[2] = (insn[0] >> 4) & 0xf;
  56       nibs[3] = insn[0] & 0xf;
  57     }
  58   else
  59     {
  60       nibs[0] = (insn[0] >> 4) & 0xf;
  61       nibs[1] = insn[0] & 0xf;
  62
  63       nibs[2] = (insn[1] >> 4) & 0xf;
  64       nibs[3] = insn[1] & 0xf;
  65     }
  66
  67   for (op = sh_table; op->name; op++)
  68     {
  69       int n;
  70       int imm;
  71       int rn;
  72       int rm;
  73       for (n = 0; n < 4; n++) {
  74         int i = op->nibbles[n];
  75         if (i < 16)
  76           {
  77             if (nibs[n] == i) continue;
  78             goto fail;
  79           }
  80         switch (i)
  81           {
  82           case BRANCH_8:
  83             imm = (nibs[2] << 4) | (nibs[3]);
  84             if (imm & 0x80)
  85               imm |= ~0xff;
  86             imm = ((char)imm) * 2 + 4 ;
  87             goto ok;
  88
  89           case BRANCH_12:
  90             imm = ((nibs[1]) << 8) | (nibs[2] << 4) | (nibs[3]);
  91             if (imm & 0x800)
  92               imm |= ~0xfff;
  93             imm = imm * 2 + 4;
  94             goto ok;
  95           case IMM_4:
  96             imm = nibs[3];
  97             goto ok;
  98           case IMM_4BY2:
  99             imm = nibs[3] <<1;
 100             goto ok;
 101           case IMM_4BY4:
 102             imm = nibs[3] <<2;
 103             goto ok;
 104
 105
 106           case IMM_8:
 107             imm = (nibs[2] << 4) | nibs[3];
 108             goto ok;
 109           case PCRELIMM_8BY2:
 110             imm = ((nibs[2] << 4) | nibs[3]) <<1;
 111             relmask  = ~1;
 112
 113             goto ok;
 114
 115           case PCRELIMM_8BY4:
 116             imm = ((nibs[2] << 4) | nibs[3]) <<2;
 117             relmask  = ~3;
 118             goto ok;
 119
 120           case IMM_8BY2:
 121             imm = ((nibs[2] << 4) | nibs[3]) <<1;
 122             goto ok;
 123           case IMM_8BY4:
 124             imm = ((nibs[2] << 4) | nibs[3]) <<2;
 125             goto ok;
 126           case DISP_8:
 127             imm = (nibs[2] << 4) | (nibs[3]);
 128             goto ok;
 129           case DISP_4:
 130             imm = nibs[3];
 131             goto ok;
 132           case REG_N:
 133             rn = nibs[n];
 134             break;
 135           case REG_M:
 136             rm = nibs[n];
 137             break;
 138           default:
 139             abort();
 140           }
 141
 142       }
 143     ok:
 144       fprintf(stream,"%s\t", op->name);
 145       for (n = 0; n < 2 && op->arg[n] != A_END; n++)
 146         {
 147           if (n && op->arg[1] != A_END)
 148             fprintf(stream,",");
 149           switch (op->arg[n])
 150             {
 151             case A_IMM:
 152               fprintf(stream,"#%d", (char)(imm));
 153               break;
 154             case A_R0:
 155               fprintf(stream,"r0");
 156               break;
 157             case A_REG_N:
 158               fprintf(stream,"r%d", rn);
 159               break;
 160             case A_INC_N:
 161               fprintf(stream,"@r%d+", rn);
 162               break;
 163             case A_DEC_N:
 164               fprintf(stream,"@-r%d", rn);
 165               break;
 166             case A_IND_N:
 167               fprintf(stream,"@r%d", rn);
 168               break;
 169             case A_DISP_REG_N:
 170               fprintf(stream,"@(%d,r%d)",imm, rn);
 171               break;
 172             case A_REG_M:
 173               fprintf(stream,"r%d", rm);
 174               break;
 175             case A_INC_M:
 176               fprintf(stream,"@r%d+", rm);
 177               break;
 178             case A_DEC_M:
 179               fprintf(stream,"@-r%d", rm);
 180               break;
 181             case A_IND_M:
 182               fprintf(stream,"@r%d", rm);
 183               break;
 184             case A_DISP_REG_M:
 185               fprintf(stream,"@(%d,r%d)",imm, rm);
 186               break;
 187             case A_DISP_PC:
 188               fprintf(stream,"0x%0x", imm+ 4+(memaddr&relmask));
 189               break;
 190             case A_IND_R0_REG_N:
 191               fprintf(stream,"@(r0,r%d)", rn);
 192               break;
 193             case A_IND_R0_REG_M:
 194               fprintf(stream,"@(r0,r%d)", rm);
 195               break;
 196             case A_DISP_GBR:
 197               fprintf(stream,"@(%d,gbr)",imm);
 198               break;
 199             case A_R0_GBR:
 200               fprintf(stream,"@(r0,gbr)");
 201               break;
 202             case A_BDISP12:
 203             case A_BDISP8:
 204               (*info->print_address_func) (imm + memaddr, info);
 205               break;
 206             case A_SR:
 207               fprintf(stream,"sr");
 208               break;
 209             case A_GBR:
 210               fprintf(stream,"gbr");
 211               break;
 212             case A_VBR:
 213               fprintf(stream,"vbr");
 214               break;
 215             case A_MACH:
 216               fprintf(stream,"mach");
 217               break;
 218             case A_MACL:
 219               fprintf(stream,"macl");
 220               break;
 221             case A_PR:
 222               fprintf(stream,"pr");
 223               break;
 224 /* start-sanitize-sh3e */
 225             case F_REG_N:
 226               fprintf(stream,"fr%d", rn);
 227               break;
 228             case F_REG_M:
 229               fprintf(stream,"fr%d", rm);
 230               break;
 231             case FPSCR_M:
 232             case FPSCR_N:
 233               fprintf(stream,"fpscr");
 234               break;
 235             case FPUL_M:
 236             case FPUL_N:
 237               fprintf(stream,"fpul");
 238               break;
 239 /* end-sanitize-sh3e */
 240             default:
 241               abort();
 242             }
 243
 244         }
 245       if (!(info->flags & 1)
 246           && (op->name[0] == 'j'
 247               || (op->name[0] == 'b'
 248                   && (op->name[1] == 'r'
 249                       || op->name[1] == 's'))
 250               || (op->name[0] == 'r' && op->name[1] == 't')
 251               || (op->name[0] == 'b' && op->name[2] == '.')))
 252         {
 253           info->flags |= 1;
 254           fprintf(stream,"\t(slot ");  print_insn_shx(memaddr +2, info);
 255           info->flags &= ~1;
 256           fprintf(stream,")");
 257           return 4;
 258         }
 259
 260       return 2;
 261     fail:
 262       ;
 263
 264     }
 265   fprintf(stream,".word 0x%x%x%x%x", nibs[0], nibs[1], nibs[2], nibs[3]);
 266   return 2;
 267 }
 268
 269
 270 int
 271 print_insn_shl(memaddr, info)
 272      bfd_vma memaddr;
 273      struct disassemble_info *info;
 274 {
 275   int r;
 276   info->flags = LITTLE_BIT;
 277   r =print_insn_shx (memaddr, info);
 278   return r;
 279 }
 280
 281 int
 282 print_insn_sh(memaddr, info)
 283      bfd_vma memaddr;
 284      struct disassemble_info *info;
 285 {
 286   int r;
 287   info->flags = 0;
 288   r =print_insn_shx (memaddr, info);
 289   return r;
 290 }