1 /* Disassemble AVR instructions. 2 Copyright 1999, 2000, 2002, 2004, 2005, 2006, 2007 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 *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 sprintf (buf, xyz); 113 114 if (AVR_UNDEF_P (insn)) 115 sprintf (comment, _("undefined")); 116 } 117 break; 118 119 case 'z': 120 *buf++ = 'Z'; 121 if (insn & 0x1) 122 *buf++ = '+'; 123 *buf = '\0'; 124 if (AVR_UNDEF_P (insn)) 125 sprintf (comment, _("undefined")); 126 break; 127 128 case 'b': 129 { 130 unsigned int x; 131 132 x = (insn & 7); 133 x |= (insn >> 7) & (3 << 3); 134 x |= (insn >> 8) & (1 << 5); 135 136 if (insn & 0x8) 137 *buf++ = 'Y'; 138 else 139 *buf++ = 'Z'; 140 sprintf (buf, "+%d", x); 141 sprintf (comment, "0x%02x", x); 142 } 143 break; 144 145 case 'h': 146 *sym = 1; 147 *sym_addr = ((((insn & 1) | ((insn & 0x1f0) >> 3)) << 16) | insn2) * 2; 148 /* See PR binutils/2454. Ideally we would like to display the hex 149 value of the address only once, but this would mean recoding 150 objdump_print_address() which would affect many targets. */ 151 sprintf (buf, "%#lx", (unsigned long) *sym_addr); 152 sprintf (comment, comment_start); 153 break; 154 155 case 'L': 156 { 157 int rel_addr = (((insn & 0xfff) ^ 0x800) - 0x800) * 2; 158 sprintf (buf, ".%+-8d", rel_addr); 159 *sym = 1; 160 *sym_addr = pc + 2 + rel_addr; 161 sprintf (comment, comment_start); 162 } 163 break; 164 165 case 'l': 166 { 167 int rel_addr = ((((insn >> 3) & 0x7f) ^ 0x40) - 0x40) * 2; 168 169 sprintf (buf, ".%+-8d", rel_addr); 170 *sym = 1; 171 *sym_addr = pc + 2 + rel_addr; 172 sprintf (comment, comment_start); 173 } 174 break; 175 176 case 'i': 177 sprintf (buf, "0x%04X", insn2); 178 break; 179 180 case 'M': 181 sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf)); 182 sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf)); 183 break; 184 185 case 'n': 186 sprintf (buf, "??"); 187 fprintf (stderr, _("Internal disassembler error")); 188 ok = 0; 189 break; 190 191 case 'K': 192 { 193 unsigned int x; 194 195 x = (insn & 0xf) | ((insn >> 2) & 0x30); 196 sprintf (buf, "0x%02x", x); 197 sprintf (comment, "%d", x); 198 } 199 break; 200 201 case 's': 202 sprintf (buf, "%d", insn & 7); 203 break; 204 205 case 'S': 206 sprintf (buf, "%d", (insn >> 4) & 7); 207 break; 208 209 case 'P': 210 { 211 unsigned int x; 212 213 x = (insn & 0xf); 214 x |= (insn >> 5) & 0x30; 215 sprintf (buf, "0x%02x", x); 216 sprintf (comment, "%d", x); 217 } 218 break; 219 220 case 'p': 221 { 222 unsigned int x; 223 224 x = (insn >> 3) & 0x1f; 225 sprintf (buf, "0x%02x", x); 226 sprintf (comment, "%d", x); 227 } 228 break; 229 230 case '?': 231 *buf = '\0'; 232 break; 233 234 default: 235 sprintf (buf, "??"); 236 fprintf (stderr, _("unknown constraint `%c'"), constraint); 237 ok = 0; 238 } 239 240 return ok; 241 } 242 243 static unsigned short 244 avrdis_opcode (bfd_vma addr, disassemble_info *info) 245 { 246 bfd_byte buffer[2]; 247 int status; 248 249 status = info->read_memory_func (addr, buffer, 2, info); 250 251 if (status == 0) 252 return bfd_getl16 (buffer); 253 254 info->memory_error_func (status, addr, info); 255 return -1; 256 } 257 258 259 int 260 print_insn_avr (bfd_vma addr, disassemble_info *info) 261 { 262 unsigned int insn, insn2; 263 const struct avr_opcodes_s *opcode; 264 static unsigned int *maskptr; 265 void *stream = info->stream; 266 fprintf_ftype prin = info->fprintf_func; 267 static unsigned int *avr_bin_masks; 268 static int initialized; 269 int cmd_len = 2; 270 int ok = 0; 271 char op1[20], op2[20], comment1[40], comment2[40]; 272 int sym_op1 = 0, sym_op2 = 0; 273 bfd_vma sym_addr1, sym_addr2; 274 275 276 if (!initialized) 277 { 278 unsigned int nopcodes; 279 280 /* PR 4045: Try to avoid duplicating the 0x prefix that 281 objdump_print_addr() will put on addresses when there 282 is no symbol table available. */ 283 if (info->symtab_size == 0) 284 comment_start = " "; 285 286 nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s); 287 288 avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int)); 289 290 for (opcode = avr_opcodes, maskptr = avr_bin_masks; 291 opcode->name; 292 opcode++, maskptr++) 293 { 294 char * s; 295 unsigned int bin = 0; 296 unsigned int mask = 0; 297 298 for (s = opcode->opcode; *s; ++s) 299 { 300 bin <<= 1; 301 mask <<= 1; 302 bin |= (*s == '1'); 303 mask |= (*s == '1' || *s == '0'); 304 } 305 assert (s - opcode->opcode == 16); 306 assert (opcode->bin_opcode == bin); 307 *maskptr = mask; 308 } 309 310 initialized = 1; 311 } 312 313 insn = avrdis_opcode (addr, info); 314 315 for (opcode = avr_opcodes, maskptr = avr_bin_masks; 316 opcode->name; 317 opcode++, maskptr++) 318 if ((insn & *maskptr) == opcode->bin_opcode) 319 break; 320 321 /* Special case: disassemble `ldd r,b+0' as `ld r,b', and 322 `std b+0,r' as `st b,r' (next entry in the table). */ 323 324 if (AVR_DISP0_P (insn)) 325 opcode++; 326 327 op1[0] = 0; 328 op2[0] = 0; 329 comment1[0] = 0; 330 comment2[0] = 0; 331 332 if (opcode->name) 333 { 334 char *op = opcode->constraints; 335 336 insn2 = 0; 337 ok = 1; 338 339 if (opcode->insn_size > 1) 340 { 341 insn2 = avrdis_opcode (addr + 2, info); 342 cmd_len = 4; 343 } 344 345 if (*op && *op != '?') 346 { 347 int regs = REGISTER_P (*op); 348 349 ok = avr_operand (insn, insn2, addr, *op, op1, comment1, 0, &sym_op1, &sym_addr1); 350 351 if (ok && *(++op) == ',') 352 ok = avr_operand (insn, insn2, addr, *(++op), op2, 353 *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2); 354 } 355 } 356 357 if (!ok) 358 { 359 /* Unknown opcode, or invalid combination of operands. */ 360 sprintf (op1, "0x%04x", insn); 361 op2[0] = 0; 362 sprintf (comment1, "????"); 363 comment2[0] = 0; 364 } 365 366 (*prin) (stream, "%s", ok ? opcode->name : ".word"); 367 368 if (*op1) 369 (*prin) (stream, "\t%s", op1); 370 371 if (*op2) 372 (*prin) (stream, ", %s", op2); 373 374 if (*comment1) 375 (*prin) (stream, "\t; %s", comment1); 376 377 if (sym_op1) 378 info->print_address_func (sym_addr1, info); 379 380 if (*comment2) 381 (*prin) (stream, " %s", comment2); 382 383 if (sym_op2) 384 info->print_address_func (sym_addr2, info); 385 386 return cmd_len; 387 } 388