disas/moxie.c

   1 /* Disassemble moxie instructions.
   2    Copyright (c) 2009  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, see <http://www.gnu.org/licenses/>. */
  16
  17 #include "qemu/osdep.h"
  18 #define STATIC_TABLE
  19 #define DEFINE_TABLE
  20
  21 #include "disas/dis-asm.h"
  22
  23 static void *stream;
  24
  25 /* Form 1 instructions come in different flavors:
  26
  27    Some have no arguments                          (MOXIE_F1_NARG)
  28    Some only use the A operand                     (MOXIE_F1_A)
  29    Some use A and B registers                      (MOXIE_F1_AB)
  30    Some use A and consume a 4 byte immediate value (MOXIE_F1_A4)
  31    Some use just a 4 byte immediate value          (MOXIE_F1_4)
  32    Some use just a 4 byte memory address           (MOXIE_F1_M)
  33    Some use B and an indirect A                    (MOXIE_F1_AiB)
  34    Some use A and an indirect B                    (MOXIE_F1_ABi)
  35    Some consume a 4 byte immediate value and use X (MOXIE_F1_4A)
  36    Some use B and an indirect A plus 4 bytes       (MOXIE_F1_AiB4)
  37    Some use A and an indirect B plus 4 bytes       (MOXIE_F1_ABi4)
  38
  39    Form 2 instructions also come in different flavors:
  40
  41    Some have no arguments                          (MOXIE_F2_NARG)
  42    Some use the A register and an 8-bit value      (MOXIE_F2_A8V)
  43
  44    Form 3 instructions also come in different flavors:
  45
  46    Some have no arguments                          (MOXIE_F3_NARG)
  47    Some have a 10-bit PC relative operand          (MOXIE_F3_PCREL).  */
  48
  49 #define MOXIE_F1_NARG 0x100
  50 #define MOXIE_F1_A    0x101
  51 #define MOXIE_F1_AB   0x102
  52 /* #define MOXIE_F1_ABC  0x103 */
  53 #define MOXIE_F1_A4   0x104
  54 #define MOXIE_F1_4    0x105
  55 #define MOXIE_F1_AiB  0x106
  56 #define MOXIE_F1_ABi  0x107
  57 #define MOXIE_F1_4A   0x108
  58 #define MOXIE_F1_AiB4 0x109
  59 #define MOXIE_F1_ABi4 0x10a
  60 #define MOXIE_F1_M    0x10b
  61
  62 #define MOXIE_F2_NARG 0x200
  63 #define MOXIE_F2_A8V  0x201
  64
  65 #define MOXIE_F3_NARG  0x300
  66 #define MOXIE_F3_PCREL 0x301
  67
  68 typedef struct moxie_opc_info_t {
  69     short         opcode;
  70     unsigned      itype;
  71     const char *  name;
  72 } moxie_opc_info_t;
  73
  74 extern const moxie_opc_info_t moxie_form1_opc_info[64];
  75 extern const moxie_opc_info_t moxie_form2_opc_info[4];
  76 extern const moxie_opc_info_t moxie_form3_opc_info[16];
  77
  78 /* The moxie processor's 16-bit instructions come in two forms:
  79
  80    FORM 1 instructions start with a 0 bit...
  81
  82    0oooooooaaaabbbb
  83    0              F
  84
  85    ooooooo - form 1 opcode number
  86    aaaa    - operand A
  87    bbbb    - operand B
  88
  89    FORM 2 instructions start with bits "10"...
  90
  91    10ooaaaavvvvvvvv
  92    0              F
  93
  94    oo       - form 2 opcode number
  95    aaaa     - operand A
  96    vvvvvvvv - 8-bit immediate value
  97
  98    FORM 3 instructions start with a bits "11"...
  99
 100    11oooovvvvvvvvvv
 101    0              F
 102
 103    oooo         - form 3 opcode number
 104    vvvvvvvvvv   - 10-bit immediate value.  */
 105
 106 const moxie_opc_info_t moxie_form1_opc_info[64] =
 107     {
 108         { 0x00, MOXIE_F1_NARG, "nop" },
 109         { 0x01, MOXIE_F1_A4,   "ldi.l" },
 110         { 0x02, MOXIE_F1_AB,   "mov" },
 111         { 0x03, MOXIE_F1_M,    "jsra" },
 112         { 0x04, MOXIE_F1_NARG, "ret" },
 113         { 0x05, MOXIE_F1_AB,   "add.l" },
 114         { 0x06, MOXIE_F1_AB,   "push" },
 115         { 0x07, MOXIE_F1_AB,   "pop" },
 116         { 0x08, MOXIE_F1_A4,   "lda.l" },
 117         { 0x09, MOXIE_F1_4A,   "sta.l" },
 118         { 0x0a, MOXIE_F1_ABi,  "ld.l" },
 119         { 0x0b, MOXIE_F1_AiB,  "st.l" },
 120         { 0x0c, MOXIE_F1_ABi4, "ldo.l" },
 121         { 0x0d, MOXIE_F1_AiB4, "sto.l" },
 122         { 0x0e, MOXIE_F1_AB,   "cmp" },
 123         { 0x0f, MOXIE_F1_NARG, "bad" },
 124         { 0x10, MOXIE_F1_NARG, "bad" },
 125         { 0x11, MOXIE_F1_NARG, "bad" },
 126         { 0x12, MOXIE_F1_NARG, "bad" },
 127         { 0x13, MOXIE_F1_NARG, "bad" },
 128         { 0x14, MOXIE_F1_NARG, "bad" },
 129         { 0x15, MOXIE_F1_NARG, "bad" },
 130         { 0x16, MOXIE_F1_NARG, "bad" },
 131         { 0x17, MOXIE_F1_NARG, "bad" },
 132         { 0x18, MOXIE_F1_NARG, "bad" },
 133         { 0x19, MOXIE_F1_A,    "jsr" },
 134         { 0x1a, MOXIE_F1_M,    "jmpa" },
 135         { 0x1b, MOXIE_F1_A4,   "ldi.b" },
 136         { 0x1c, MOXIE_F1_ABi,  "ld.b" },
 137         { 0x1d, MOXIE_F1_A4,   "lda.b" },
 138         { 0x1e, MOXIE_F1_AiB,  "st.b" },
 139         { 0x1f, MOXIE_F1_4A,   "sta.b" },
 140         { 0x20, MOXIE_F1_A4,   "ldi.s" },
 141         { 0x21, MOXIE_F1_ABi,  "ld.s" },
 142         { 0x22, MOXIE_F1_A4,   "lda.s" },
 143         { 0x23, MOXIE_F1_AiB,  "st.s" },
 144         { 0x24, MOXIE_F1_4A,   "sta.s" },
 145         { 0x25, MOXIE_F1_A,    "jmp" },
 146         { 0x26, MOXIE_F1_AB,   "and" },
 147         { 0x27, MOXIE_F1_AB,   "lshr" },
 148         { 0x28, MOXIE_F1_AB,   "ashl" },
 149         { 0x29, MOXIE_F1_AB,   "sub.l" },
 150         { 0x2a, MOXIE_F1_AB,   "neg" },
 151         { 0x2b, MOXIE_F1_AB,   "or" },
 152         { 0x2c, MOXIE_F1_AB,   "not" },
 153         { 0x2d, MOXIE_F1_AB,   "ashr" },
 154         { 0x2e, MOXIE_F1_AB,   "xor" },
 155         { 0x2f, MOXIE_F1_AB,   "mul.l" },
 156         { 0x30, MOXIE_F1_4,    "swi" },
 157         { 0x31, MOXIE_F1_AB,   "div.l" },
 158         { 0x32, MOXIE_F1_AB,   "udiv.l" },
 159         { 0x33, MOXIE_F1_AB,   "mod.l" },
 160         { 0x34, MOXIE_F1_AB,   "umod.l" },
 161         { 0x35, MOXIE_F1_NARG, "brk" },
 162         { 0x36, MOXIE_F1_ABi4, "ldo.b" },
 163         { 0x37, MOXIE_F1_AiB4, "sto.b" },
 164         { 0x38, MOXIE_F1_ABi4, "ldo.s" },
 165         { 0x39, MOXIE_F1_AiB4, "sto.s" },
 166         { 0x3a, MOXIE_F1_NARG, "bad" },
 167         { 0x3b, MOXIE_F1_NARG, "bad" },
 168         { 0x3c, MOXIE_F1_NARG, "bad" },
 169         { 0x3d, MOXIE_F1_NARG, "bad" },
 170         { 0x3e, MOXIE_F1_NARG, "bad" },
 171         { 0x3f, MOXIE_F1_NARG, "bad" }
 172     };
 173
 174 const moxie_opc_info_t moxie_form2_opc_info[4] =
 175     {
 176         { 0x00, MOXIE_F2_A8V,  "inc" },
 177         { 0x01, MOXIE_F2_A8V,  "dec" },
 178         { 0x02, MOXIE_F2_A8V,  "gsr" },
 179         { 0x03, MOXIE_F2_A8V,  "ssr" }
 180     };
 181
 182 const moxie_opc_info_t moxie_form3_opc_info[16] =
 183     {
 184         { 0x00, MOXIE_F3_PCREL,"beq" },
 185         { 0x01, MOXIE_F3_PCREL,"bne" },
 186         { 0x02, MOXIE_F3_PCREL,"blt" },
 187         { 0x03, MOXIE_F3_PCREL,"bgt" },
 188         { 0x04, MOXIE_F3_PCREL,"bltu" },
 189         { 0x05, MOXIE_F3_PCREL,"bgtu" },
 190         { 0x06, MOXIE_F3_PCREL,"bge" },
 191         { 0x07, MOXIE_F3_PCREL,"ble" },
 192         { 0x08, MOXIE_F3_PCREL,"bgeu" },
 193         { 0x09, MOXIE_F3_PCREL,"bleu" },
 194         { 0x0a, MOXIE_F3_NARG, "bad" },
 195         { 0x0b, MOXIE_F3_NARG, "bad" },
 196         { 0x0c, MOXIE_F3_NARG, "bad" },
 197         { 0x0d, MOXIE_F3_NARG, "bad" },
 198         { 0x0e, MOXIE_F3_NARG, "bad" },
 199         { 0x0f, MOXIE_F3_NARG, "bad" }
 200     };
 201
 202 /* Macros to extract operands from the instruction word.  */
 203 #define OP_A(i) ((i >> 4) & 0xf)
 204 #define OP_B(i) (i & 0xf)
 205 #define INST2OFFSET(o) ((((signed short)((o & ((1<<10)-1))<<6))>>6)<<1)
 206
 207 static const char * reg_names[16] =
 208     { "$fp", "$sp", "$r0", "$r1", "$r2", "$r3", "$r4", "$r5",
 209       "$r6", "$r7", "$r8", "$r9", "$r10", "$r11", "$r12", "$r13" };
 210
 211 int
 212 print_insn_moxie(bfd_vma addr, struct disassemble_info * info)
 213 {
 214     int length = 2;
 215     int status;
 216     stream = info->stream;
 217     const moxie_opc_info_t * opcode;
 218     bfd_byte buffer[4];
 219     unsigned short iword;
 220     fprintf_function fpr = info->fprintf_func;
 221
 222     if ((status = info->read_memory_func(addr, buffer, 2, info)))
 223         goto fail;
 224     iword = (bfd_getb16(buffer) >> 16);
 225
 226     /* Form 1 instructions have the high bit set to 0.  */
 227     if ((iword & (1<<15)) == 0) {
 228         /* Extract the Form 1 opcode.  */
 229         opcode = &moxie_form1_opc_info[iword >> 8];
 230         switch (opcode->itype) {
 231         case MOXIE_F1_NARG:
 232             fpr(stream, "%s", opcode->name);
 233             break;
 234         case MOXIE_F1_A:
 235             fpr(stream, "%s\t%s", opcode->name,
 236                 reg_names[OP_A(iword)]);
 237             break;
 238         case MOXIE_F1_AB:
 239             fpr(stream, "%s\t%s, %s", opcode->name,
 240                 reg_names[OP_A(iword)],
 241                 reg_names[OP_B(iword)]);
 242             break;
 243         case MOXIE_F1_A4:
 244             {
 245                 unsigned imm;
 246                 if ((status = info->read_memory_func(addr + 2, buffer, 4, info)))
 247                     goto fail;
 248                 imm = bfd_getb32(buffer);
 249                 fpr(stream, "%s\t%s, 0x%x", opcode->name,
 250                     reg_names[OP_A(iword)], imm);
 251                 length = 6;
 252             }
 253             break;
 254         case MOXIE_F1_4:
 255             {
 256                 unsigned imm;
 257                 if ((status = info->read_memory_func(addr + 2, buffer, 4, info)))
 258                     goto fail;
 259                 imm = bfd_getb32(buffer);
 260                 fpr(stream, "%s\t0x%x", opcode->name, imm);
 261                 length = 6;
 262             }
 263             break;
 264         case MOXIE_F1_M:
 265             {
 266                 unsigned imm;
 267                 if ((status = info->read_memory_func(addr + 2, buffer, 4, info)))
 268                     goto fail;
 269                 imm = bfd_getb32(buffer);
 270                 fpr(stream, "%s\t", opcode->name);
 271                 info->print_address_func((bfd_vma) imm, info);
 272                 length = 6;
 273             }
 274             break;
 275         case MOXIE_F1_AiB:
 276             fpr (stream, "%s\t(%s), %s", opcode->name,
 277                  reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 278             break;
 279         case MOXIE_F1_ABi:
 280             fpr(stream, "%s\t%s, (%s)", opcode->name,
 281                 reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
 282             break;
 283         case MOXIE_F1_4A:
 284             {
 285                 unsigned imm;
 286                 if ((status = info->read_memory_func(addr + 2, buffer, 4, info)))
 287                     goto fail;
 288                 imm = bfd_getb32(buffer);
 289                 fpr(stream, "%s\t0x%x, %s",
 290                     opcode->name, imm, reg_names[OP_A(iword)]);
 291                 length = 6;
 292             }
 293             break;
 294         case MOXIE_F1_AiB4:
 295             {
 296                 unsigned imm;
 297                 if ((status = info->read_memory_func(addr+2, buffer, 4, info)))
 298                     goto fail;
 299                 imm = bfd_getb32(buffer);
 300                 fpr(stream, "%s\t0x%x(%s), %s", opcode->name,
 301                     imm,
 302                     reg_names[OP_A(iword)],
 303                     reg_names[OP_B(iword)]);
 304                 length = 6;
 305             }
 306             break;
 307         case MOXIE_F1_ABi4:
 308             {
 309                 unsigned imm;
 310                 if ((status = info->read_memory_func(addr+2, buffer, 4, info)))
 311                     goto fail;
 312                 imm = bfd_getb32(buffer);
 313                 fpr(stream, "%s\t%s, 0x%x(%s)",
 314                     opcode->name,
 315                     reg_names[OP_A(iword)],
 316                     imm,
 317                     reg_names[OP_B(iword)]);
 318                 length = 6;
 319             }
 320             break;
 321         default:
 322             abort();
 323         }
 324     }
 325     else if ((iword & (1<<14)) == 0) {
 326         /* Extract the Form 2 opcode.  */
 327         opcode = &moxie_form2_opc_info[(iword >> 12) & 3];
 328         switch (opcode->itype) {
 329         case MOXIE_F2_A8V:
 330             fpr(stream, "%s\t%s, 0x%x",
 331                 opcode->name,
 332                 reg_names[(iword >> 8) & 0xf],
 333                 iword & ((1 << 8) - 1));
 334             break;
 335         case MOXIE_F2_NARG:
 336             fpr(stream, "%s", opcode->name);
 337             break;
 338         default:
 339             abort();
 340         }
 341     } else {
 342         /* Extract the Form 3 opcode.  */
 343         opcode = &moxie_form3_opc_info[(iword >> 10) & 15];
 344         switch (opcode->itype) {
 345         case MOXIE_F3_PCREL:
 346             fpr(stream, "%s\t", opcode->name);
 347             info->print_address_func((bfd_vma) (addr + INST2OFFSET(iword) + 2),
 348                                      info);
 349             break;
 350         default:
 351             abort();
 352         }
 353     }
 354
 355     return length;
 356
 357  fail:
 358     info->memory_error_func(status, addr, info);
 359     return -1;
 360 }