1 /* Disassemble AVR instructions. 2 Copyright 1999, 2000, 2002, 2004, 2005, 2006, 2007, 2008 3 Free Software Foundation, Inc. 4 5 Contributed by Denis Chertykov <denisc@overta.ru> 6 7 This file is part of libopcodes. 8 9 This library is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3, or (at your option) 12 any later version. 13 14 It is distributed in the hope that it will be useful, but WITHOUT 15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 17 License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 22 MA 02110-1301, USA. */ 23 24 #include <assert.h> 25 #include "sysdep.h" 26 #include "dis-asm.h" 27 #include "opintl.h" 28 #include "libiberty.h" 29 30 struct avr_opcodes_s 31 { 32 char *name; 33 char *constraints; 34 char *opcode; 35 int insn_size; /* In words. */ 36 int isa; 37 unsigned int bin_opcode; 38 }; 39 40 #define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \ 41 {#NAME, CONSTR, OPCODE, SIZE, ISA, BIN}, 42 43 const struct avr_opcodes_s avr_opcodes[] = 44 { 45 #include "opcode/avr.h" 46 {NULL, NULL, NULL, 0, 0, 0} 47 }; 48 49 static const char * comment_start = "0x"; 50 51 static int 52 avr_operand (unsigned int insn, unsigned int insn2, unsigned int pc, int constraint, 53 char *opcode_str, char *buf, char *comment, int regs, int *sym, bfd_vma *sym_addr) 54 { 55 int ok = 1; 56 *sym = 0; 57 58 switch (constraint) 59 { 60 /* Any register operand. */ 61 case 'r': 62 if (regs) 63 insn = (insn & 0xf) | ((insn & 0x0200) >> 5); /* Source register. */ 64 else 65 insn = (insn & 0x01f0) >> 4; /* Destination register. */ 66 67 sprintf (buf, "r%d", insn); 68 break; 69 70 case 'd': 71 if (regs) 72 sprintf (buf, "r%d", 16 + (insn & 0xf)); 73 else 74 sprintf (buf, "r%d", 16 + ((insn & 0xf0) >> 4)); 75 break; 76 77 case 'w': 78 sprintf (buf, "r%d", 24 + ((insn & 0x30) >> 3)); 79 break; 80 81 case 'a': 82 if (regs) 83 sprintf (buf, "r%d", 16 + (insn & 7)); 84 else 85 sprintf (buf, "r%d", 16 + ((insn >> 4) & 7)); 86 break; 87 88 case 'v': 89 if (regs) 90 sprintf (buf, "r%d", (insn & 0xf) * 2); 91 else 92 sprintf (buf, "r%d", ((insn & 0xf0) >> 3)); 93 break; 94 95 case 'e': 96 { 97 char *xyz; 98 99 switch (insn & 0x100f) 100 { 101 case 0x0000: xyz = "Z"; break; 102 case 0x1001: xyz = "Z+"; break; 103 case 0x1002: xyz = "-Z"; break; 104 case 0x0008: xyz = "Y"; break; 105 case 0x1009: xyz = "Y+"; break; 106 case 0x100a: xyz = "-Y"; break; 107 case 0x100c: xyz = "X"; break; 108 case 0x100d: xyz = "X+"; break; 109 case 0x100e: xyz = "-X"; break; 110 default: xyz = "??"; ok = 0; 111 } 112 strcpy (buf, xyz); 113 114 if (AVR_UNDEF_P (insn)) 115 sprintf (comment, _("undefined")); 116 } 117 break; 118 119 case 'z': 120 *buf++ = 'Z'; 121 122 /* Check for post-increment. */ 123 char *s; 124 for (s = opcode_str; *s; ++s) 125 { 126 if (*s == '+') 127 { 128 *buf++ = '+'; 129 break; 130 } 131 } 132 133 *buf = '\0'; 134 if (AVR_UNDEF_P (insn)) 135 sprintf (comment, _("undefined")); 136 break; 137 138 case 'b': 139 { 140 unsigned int x; 141 142 x = (insn & 7); 143 x |= (insn >> 7) & (3 << 3); 144 x |= (insn >> 8) & (1 << 5); 145 146 if (insn & 0x8) 147 *buf++ = 'Y'; 148 else 149 *buf++ = 'Z'; 150 sprintf (buf, "+%d", x); 151 sprintf (comment, "0x%02x", x); 152 } 153 break; 154 155 case 'h': 156 *sym = 1; 157 *sym_addr = ((((insn & 1) | ((insn & 0x1f0) >> 3)) << 16) | insn2) * 2; 158 /* See PR binutils/2454. Ideally we would like to display the hex 159 value of the address only once, but this would mean recoding 160 objdump_print_address() which would affect many targets. */ 161 sprintf (buf, "%#lx", (unsigned long) *sym_addr); 162 strcpy (comment, comment_start); 163 break; 164 165 case 'L': 166 { 167 int rel_addr = (((insn & 0xfff) ^ 0x800) - 0x800) * 2; 168 sprintf (buf, ".%+-8d", rel_addr); 169 *sym = 1; 170 *sym_addr = pc + 2 + rel_addr; 171 strcpy (comment, comment_start); 172 } 173 break; 174 175 case 'l': 176 { 177 int rel_addr = ((((insn >> 3) & 0x7f) ^ 0x40) - 0x40) * 2; 178 179 sprintf (buf, ".%+-8d", rel_addr); 180 *sym = 1; 181 *sym_addr = pc + 2 + rel_addr; 182 strcpy (comment, comment_start); 183 } 184 break; 185 186 case 'i': 187 sprintf (buf, "0x%04X", insn2); 188 break; 189 190 case 'M': 191 sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf)); 192 sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf)); 193 break; 194 195 case 'n': 196 sprintf (buf, "??"); 197 fprintf (stderr, _("Internal disassembler error")); 198 ok = 0; 199 break; 200 201 case 'K': 202 { 203 unsigned int x; 204 205 x = (insn & 0xf) | ((insn >> 2) & 0x30); 206 sprintf (buf, "0x%02x", x); 207 sprintf (comment, "%d", x); 208 } 209 break; 210 211 case 's': 212 sprintf (buf, "%d", insn & 7); 213 break; 214 215 case 'S': 216 sprintf (buf, "%d", (insn >> 4) & 7); 217 break; 218 219 case 'P': 220 { 221 unsigned int x; 222 223 x = (insn & 0xf); 224 x |= (insn >> 5) & 0x30; 225 sprintf (buf, "0x%02x", x); 226 sprintf (comment, "%d", x); 227 } 228 break; 229 230 case 'p': 231 { 232 unsigned int x; 233 234 x = (insn >> 3) & 0x1f; 235 sprintf (buf, "0x%02x", x); 236 sprintf (comment, "%d", x); 237 } 238 break; 239 240 case 'E': 241 sprintf (buf, "%d", (insn >> 4) & 15); 242 break; 243 244 case '?': 245 *buf = '\0'; 246 break; 247 248 default: 249 sprintf (buf, "??"); 250 fprintf (stderr, _("unknown constraint `%c'"), constraint); 251 ok = 0; 252 } 253 254 return ok; 255 } 256 257 static unsigned short 258 avrdis_opcode (bfd_vma addr, disassemble_info *info) 259 { 260 bfd_byte buffer[2]; 261 int status; 262 263 status = info->read_memory_func (addr, buffer, 2, info); 264 265 if (status == 0) 266 return bfd_getl16 (buffer); 267 268 info->memory_error_func (status, addr, info); 269 return -1; 270 } 271 272 273 int 274 print_insn_avr (bfd_vma addr, disassemble_info *info) 275 { 276 unsigned int insn, insn2; 277 const struct avr_opcodes_s *opcode; 278 static unsigned int *maskptr; 279 void *stream = info->stream; 280 fprintf_ftype prin = info->fprintf_func; 281 static unsigned int *avr_bin_masks; 282 static int initialized; 283 int cmd_len = 2; 284 int ok = 0; 285 char op1[20], op2[20], comment1[40], comment2[40]; 286 int sym_op1 = 0, sym_op2 = 0; 287 bfd_vma sym_addr1, sym_addr2; 288 289 290 if (!initialized) 291 { 292 unsigned int nopcodes; 293 294 /* PR 4045: Try to avoid duplicating the 0x prefix that 295 objdump_print_addr() will put on addresses when there 296 is no symbol table available. */ 297 if (info->symtab_size == 0) 298 comment_start = " "; 299 300 nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s); 301 302 avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int)); 303 304 for (opcode = avr_opcodes, maskptr = avr_bin_masks; 305 opcode->name; 306 opcode++, maskptr++) 307 { 308 char * s; 309 unsigned int bin = 0; 310 unsigned int mask = 0; 311 312 for (s = opcode->opcode; *s; ++s) 313 { 314 bin <<= 1; 315 mask <<= 1; 316 bin |= (*s == '1'); 317 mask |= (*s == '1' || *s == '0'); 318 } 319 assert (s - opcode->opcode == 16); 320 assert (opcode->bin_opcode == bin); 321 *maskptr = mask; 322 } 323 324 initialized = 1; 325 } 326 327 insn = avrdis_opcode (addr, info); 328 329 for (opcode = avr_opcodes, maskptr = avr_bin_masks; 330 opcode->name; 331 opcode++, maskptr++) 332 if ((insn & *maskptr) == opcode->bin_opcode) 333 break; 334 335 /* Special case: disassemble `ldd r,b+0' as `ld r,b', and 336 `std b+0,r' as `st b,r' (next entry in the table). */ 337 338 if (AVR_DISP0_P (insn)) 339 opcode++; 340 341 op1[0] = 0; 342 op2[0] = 0; 343 comment1[0] = 0; 344 comment2[0] = 0; 345 346 if (opcode->name) 347 { 348 char *constraints = opcode->constraints; 349 char *opcode_str = opcode->opcode; 350 351 insn2 = 0; 352 ok = 1; 353 354 if (opcode->insn_size > 1) 355 { 356 insn2 = avrdis_opcode (addr + 2, info); 357 cmd_len = 4; 358 } 359 360 if (*constraints && *constraints != '?') 361 { 362 int regs = REGISTER_P (*constraints); 363 364 ok = avr_operand (insn, insn2, addr, *constraints, opcode_str, op1, comment1, 0, &sym_op1, &sym_addr1); 365 366 if (ok && *(++constraints) == ',') 367 ok = avr_operand (insn, insn2, addr, *(++constraints), opcode_str, op2, 368 *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2); 369 } 370 } 371 372 if (!ok) 373 { 374 /* Unknown opcode, or invalid combination of operands. */ 375 sprintf (op1, "0x%04x", insn); 376 op2[0] = 0; 377 sprintf (comment1, "????"); 378 comment2[0] = 0; 379 } 380 381 (*prin) (stream, "%s", ok ? opcode->name : ".word"); 382 383 if (*op1) 384 (*prin) (stream, "\t%s", op1); 385 386 if (*op2) 387 (*prin) (stream, ", %s", op2); 388 389 if (*comment1) 390 (*prin) (stream, "\t; %s", comment1); 391 392 if (sym_op1) 393 info->print_address_func (sym_addr1, info); 394 395 if (*comment2) 396 (*prin) (stream, " %s", comment2); 397 398 if (sym_op2) 399 info->print_address_func (sym_addr2, info); 400 401 return cmd_len; 402 } 403