1 /* Disassemble AVR instructions. 2 Copyright 1999, 2000, 2002, 2004, 2005, 2006, 2007, 2008, 2012 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 "sysdep.h" 25 #include <assert.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 if (insn & (1 << (15 - (s - opcode_str)))) 129 *buf++ = '+'; 130 break; 131 } 132 } 133 134 *buf = '\0'; 135 if (AVR_UNDEF_P (insn)) 136 sprintf (comment, _("undefined")); 137 break; 138 139 case 'b': 140 { 141 unsigned int x; 142 143 x = (insn & 7); 144 x |= (insn >> 7) & (3 << 3); 145 x |= (insn >> 8) & (1 << 5); 146 147 if (insn & 0x8) 148 *buf++ = 'Y'; 149 else 150 *buf++ = 'Z'; 151 sprintf (buf, "+%d", x); 152 sprintf (comment, "0x%02x", x); 153 } 154 break; 155 156 case 'h': 157 *sym = 1; 158 *sym_addr = ((((insn & 1) | ((insn & 0x1f0) >> 3)) << 16) | insn2) * 2; 159 /* See PR binutils/2454. Ideally we would like to display the hex 160 value of the address only once, but this would mean recoding 161 objdump_print_address() which would affect many targets. */ 162 sprintf (buf, "%#lx", (unsigned long) *sym_addr); 163 strcpy (comment, comment_start); 164 break; 165 166 case 'L': 167 { 168 int rel_addr = (((insn & 0xfff) ^ 0x800) - 0x800) * 2; 169 sprintf (buf, ".%+-8d", rel_addr); 170 *sym = 1; 171 *sym_addr = pc + 2 + rel_addr; 172 strcpy (comment, comment_start); 173 } 174 break; 175 176 case 'l': 177 { 178 int rel_addr = ((((insn >> 3) & 0x7f) ^ 0x40) - 0x40) * 2; 179 180 sprintf (buf, ".%+-8d", rel_addr); 181 *sym = 1; 182 *sym_addr = pc + 2 + rel_addr; 183 strcpy (comment, comment_start); 184 } 185 break; 186 187 case 'i': 188 sprintf (buf, "0x%04X", insn2); 189 break; 190 191 case 'M': 192 sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf)); 193 sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf)); 194 break; 195 196 case 'n': 197 sprintf (buf, "??"); 198 fprintf (stderr, _("Internal disassembler error")); 199 ok = 0; 200 break; 201 202 case 'K': 203 { 204 unsigned int x; 205 206 x = (insn & 0xf) | ((insn >> 2) & 0x30); 207 sprintf (buf, "0x%02x", x); 208 sprintf (comment, "%d", x); 209 } 210 break; 211 212 case 's': 213 sprintf (buf, "%d", insn & 7); 214 break; 215 216 case 'S': 217 sprintf (buf, "%d", (insn >> 4) & 7); 218 break; 219 220 case 'P': 221 { 222 unsigned int x; 223 224 x = (insn & 0xf); 225 x |= (insn >> 5) & 0x30; 226 sprintf (buf, "0x%02x", x); 227 sprintf (comment, "%d", x); 228 } 229 break; 230 231 case 'p': 232 { 233 unsigned int x; 234 235 x = (insn >> 3) & 0x1f; 236 sprintf (buf, "0x%02x", x); 237 sprintf (comment, "%d", x); 238 } 239 break; 240 241 case 'E': 242 sprintf (buf, "%d", (insn >> 4) & 15); 243 break; 244 245 case '?': 246 *buf = '\0'; 247 break; 248 249 default: 250 sprintf (buf, "??"); 251 fprintf (stderr, _("unknown constraint `%c'"), constraint); 252 ok = 0; 253 } 254 255 return ok; 256 } 257 258 static unsigned short 259 avrdis_opcode (bfd_vma addr, disassemble_info *info) 260 { 261 bfd_byte buffer[2]; 262 int status; 263 264 status = info->read_memory_func (addr, buffer, 2, info); 265 266 if (status == 0) 267 return bfd_getl16 (buffer); 268 269 info->memory_error_func (status, addr, info); 270 return -1; 271 } 272 273 274 int 275 print_insn_avr (bfd_vma addr, disassemble_info *info) 276 { 277 unsigned int insn, insn2; 278 const struct avr_opcodes_s *opcode; 279 static unsigned int *maskptr; 280 void *stream = info->stream; 281 fprintf_ftype prin = info->fprintf_func; 282 static unsigned int *avr_bin_masks; 283 static int initialized; 284 int cmd_len = 2; 285 int ok = 0; 286 char op1[20], op2[20], comment1[40], comment2[40]; 287 int sym_op1 = 0, sym_op2 = 0; 288 bfd_vma sym_addr1, sym_addr2; 289 290 291 if (!initialized) 292 { 293 unsigned int nopcodes; 294 295 /* PR 4045: Try to avoid duplicating the 0x prefix that 296 objdump_print_addr() will put on addresses when there 297 is no symbol table available. */ 298 if (info->symtab_size == 0) 299 comment_start = " "; 300 301 nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s); 302 303 avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int)); 304 305 for (opcode = avr_opcodes, maskptr = avr_bin_masks; 306 opcode->name; 307 opcode++, maskptr++) 308 { 309 char * s; 310 unsigned int bin = 0; 311 unsigned int mask = 0; 312 313 for (s = opcode->opcode; *s; ++s) 314 { 315 bin <<= 1; 316 mask <<= 1; 317 bin |= (*s == '1'); 318 mask |= (*s == '1' || *s == '0'); 319 } 320 assert (s - opcode->opcode == 16); 321 assert (opcode->bin_opcode == bin); 322 *maskptr = mask; 323 } 324 325 initialized = 1; 326 } 327 328 insn = avrdis_opcode (addr, info); 329 330 for (opcode = avr_opcodes, maskptr = avr_bin_masks; 331 opcode->name; 332 opcode++, maskptr++) 333 if ((insn & *maskptr) == opcode->bin_opcode) 334 break; 335 336 /* Special case: disassemble `ldd r,b+0' as `ld r,b', and 337 `std b+0,r' as `st b,r' (next entry in the table). */ 338 339 if (AVR_DISP0_P (insn)) 340 opcode++; 341 342 op1[0] = 0; 343 op2[0] = 0; 344 comment1[0] = 0; 345 comment2[0] = 0; 346 347 if (opcode->name) 348 { 349 char *constraints = opcode->constraints; 350 char *opcode_str = opcode->opcode; 351 352 insn2 = 0; 353 ok = 1; 354 355 if (opcode->insn_size > 1) 356 { 357 insn2 = avrdis_opcode (addr + 2, info); 358 cmd_len = 4; 359 } 360 361 if (*constraints && *constraints != '?') 362 { 363 int regs = REGISTER_P (*constraints); 364 365 ok = avr_operand (insn, insn2, addr, *constraints, opcode_str, op1, comment1, 0, &sym_op1, &sym_addr1); 366 367 if (ok && *(++constraints) == ',') 368 ok = avr_operand (insn, insn2, addr, *(++constraints), opcode_str, op2, 369 *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2); 370 } 371 } 372 373 if (!ok) 374 { 375 /* Unknown opcode, or invalid combination of operands. */ 376 sprintf (op1, "0x%04x", insn); 377 op2[0] = 0; 378 sprintf (comment1, "????"); 379 comment2[0] = 0; 380 } 381 382 (*prin) (stream, "%s", ok ? opcode->name : ".word"); 383 384 if (*op1) 385 (*prin) (stream, "\t%s", op1); 386 387 if (*op2) 388 (*prin) (stream, ", %s", op2); 389 390 if (*comment1) 391 (*prin) (stream, "\t; %s", comment1); 392 393 if (sym_op1) 394 info->print_address_func (sym_addr1, info); 395 396 if (*comment2) 397 (*prin) (stream, " %s", comment2); 398 399 if (sym_op2) 400 info->print_address_func (sym_addr2, info); 401 402 return cmd_len; 403 } 404