| 1 | /* Disassemble AVR instructions. |
| 2 | Copyright (C) 1999-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by Denis Chertykov <denisc@overta.ru> |
| 5 | |
| 6 | This file is part of libopcodes. |
| 7 | |
| 8 | This library is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | It is distributed in the hope that it will be useful, but WITHOUT |
| 14 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 15 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
| 16 | License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | MA 02110-1301, USA. */ |
| 22 | |
| 23 | #include "sysdep.h" |
| 24 | #include <assert.h> |
| 25 | #include "disassemble.h" |
| 26 | #include "opintl.h" |
| 27 | #include "libiberty.h" |
| 28 | #include "bfd_stdint.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 | { |
| 189 | unsigned int val = insn2 | 0x800000; |
| 190 | *sym = 1; |
| 191 | *sym_addr = val; |
| 192 | sprintf (buf, "0x%04X", insn2); |
| 193 | strcpy (comment, comment_start); |
| 194 | } |
| 195 | break; |
| 196 | |
| 197 | case 'j': |
| 198 | { |
| 199 | unsigned int val = ((insn & 0xf) | ((insn & 0x600) >> 5) |
| 200 | | ((insn & 0x100) >> 2)); |
| 201 | if ((insn & 0x100) == 0) |
| 202 | val |= 0x80; |
| 203 | *sym = 1; |
| 204 | *sym_addr = val | 0x800000; |
| 205 | sprintf (buf, "0x%02x", val); |
| 206 | strcpy (comment, comment_start); |
| 207 | } |
| 208 | break; |
| 209 | |
| 210 | case 'M': |
| 211 | sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf)); |
| 212 | sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf)); |
| 213 | break; |
| 214 | |
| 215 | case 'n': |
| 216 | sprintf (buf, "??"); |
| 217 | /* xgettext:c-format */ |
| 218 | opcodes_error_handler (_("internal disassembler error")); |
| 219 | ok = 0; |
| 220 | break; |
| 221 | |
| 222 | case 'K': |
| 223 | { |
| 224 | unsigned int x; |
| 225 | |
| 226 | x = (insn & 0xf) | ((insn >> 2) & 0x30); |
| 227 | sprintf (buf, "0x%02x", x); |
| 228 | sprintf (comment, "%d", x); |
| 229 | } |
| 230 | break; |
| 231 | |
| 232 | case 's': |
| 233 | sprintf (buf, "%d", insn & 7); |
| 234 | break; |
| 235 | |
| 236 | case 'S': |
| 237 | sprintf (buf, "%d", (insn >> 4) & 7); |
| 238 | break; |
| 239 | |
| 240 | case 'P': |
| 241 | { |
| 242 | unsigned int x; |
| 243 | |
| 244 | x = (insn & 0xf); |
| 245 | x |= (insn >> 5) & 0x30; |
| 246 | sprintf (buf, "0x%02x", x); |
| 247 | sprintf (comment, "%d", x); |
| 248 | } |
| 249 | break; |
| 250 | |
| 251 | case 'p': |
| 252 | { |
| 253 | unsigned int x; |
| 254 | |
| 255 | x = (insn >> 3) & 0x1f; |
| 256 | sprintf (buf, "0x%02x", x); |
| 257 | sprintf (comment, "%d", x); |
| 258 | } |
| 259 | break; |
| 260 | |
| 261 | case 'E': |
| 262 | sprintf (buf, "%d", (insn >> 4) & 15); |
| 263 | break; |
| 264 | |
| 265 | case '?': |
| 266 | *buf = '\0'; |
| 267 | break; |
| 268 | |
| 269 | default: |
| 270 | sprintf (buf, "??"); |
| 271 | /* xgettext:c-format */ |
| 272 | opcodes_error_handler (_("unknown constraint `%c'"), constraint); |
| 273 | ok = 0; |
| 274 | } |
| 275 | |
| 276 | return ok; |
| 277 | } |
| 278 | |
| 279 | /* Read the opcode from ADDR. Return 0 in success and save opcode |
| 280 | in *INSN, otherwise, return -1. */ |
| 281 | |
| 282 | static int |
| 283 | avrdis_opcode (bfd_vma addr, disassemble_info *info, uint16_t *insn) |
| 284 | { |
| 285 | bfd_byte buffer[2]; |
| 286 | int status; |
| 287 | |
| 288 | status = info->read_memory_func (addr, buffer, 2, info); |
| 289 | |
| 290 | if (status == 0) |
| 291 | { |
| 292 | *insn = bfd_getl16 (buffer); |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | info->memory_error_func (status, addr, info); |
| 297 | return -1; |
| 298 | } |
| 299 | |
| 300 | |
| 301 | int |
| 302 | print_insn_avr (bfd_vma addr, disassemble_info *info) |
| 303 | { |
| 304 | uint16_t insn, insn2; |
| 305 | const struct avr_opcodes_s *opcode; |
| 306 | static unsigned int *maskptr; |
| 307 | void *stream = info->stream; |
| 308 | fprintf_ftype prin = info->fprintf_func; |
| 309 | static unsigned int *avr_bin_masks; |
| 310 | static int initialized; |
| 311 | int cmd_len = 2; |
| 312 | int ok = 0; |
| 313 | char op1[20], op2[20], comment1[40], comment2[40]; |
| 314 | int sym_op1 = 0, sym_op2 = 0; |
| 315 | bfd_vma sym_addr1, sym_addr2; |
| 316 | |
| 317 | |
| 318 | if (!initialized) |
| 319 | { |
| 320 | unsigned int nopcodes; |
| 321 | |
| 322 | /* PR 4045: Try to avoid duplicating the 0x prefix that |
| 323 | objdump_print_addr() will put on addresses when there |
| 324 | is no symbol table available. */ |
| 325 | if (info->symtab_size == 0) |
| 326 | comment_start = " "; |
| 327 | |
| 328 | nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s); |
| 329 | |
| 330 | avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int)); |
| 331 | |
| 332 | for (opcode = avr_opcodes, maskptr = avr_bin_masks; |
| 333 | opcode->name; |
| 334 | opcode++, maskptr++) |
| 335 | { |
| 336 | char * s; |
| 337 | unsigned int bin = 0; |
| 338 | unsigned int mask = 0; |
| 339 | |
| 340 | for (s = opcode->opcode; *s; ++s) |
| 341 | { |
| 342 | bin <<= 1; |
| 343 | mask <<= 1; |
| 344 | bin |= (*s == '1'); |
| 345 | mask |= (*s == '1' || *s == '0'); |
| 346 | } |
| 347 | assert (s - opcode->opcode == 16); |
| 348 | assert (opcode->bin_opcode == bin); |
| 349 | *maskptr = mask; |
| 350 | } |
| 351 | |
| 352 | initialized = 1; |
| 353 | } |
| 354 | |
| 355 | if (avrdis_opcode (addr, info, &insn) != 0) |
| 356 | return -1; |
| 357 | |
| 358 | for (opcode = avr_opcodes, maskptr = avr_bin_masks; |
| 359 | opcode->name; |
| 360 | opcode++, maskptr++) |
| 361 | { |
| 362 | if ((opcode->isa == AVR_ISA_TINY) && (info->mach != bfd_mach_avrtiny)) |
| 363 | continue; |
| 364 | if ((insn & *maskptr) == opcode->bin_opcode) |
| 365 | break; |
| 366 | } |
| 367 | |
| 368 | /* Special case: disassemble `ldd r,b+0' as `ld r,b', and |
| 369 | `std b+0,r' as `st b,r' (next entry in the table). */ |
| 370 | |
| 371 | if (AVR_DISP0_P (insn)) |
| 372 | opcode++; |
| 373 | |
| 374 | op1[0] = 0; |
| 375 | op2[0] = 0; |
| 376 | comment1[0] = 0; |
| 377 | comment2[0] = 0; |
| 378 | |
| 379 | if (opcode->name) |
| 380 | { |
| 381 | char *constraints = opcode->constraints; |
| 382 | char *opcode_str = opcode->opcode; |
| 383 | |
| 384 | insn2 = 0; |
| 385 | ok = 1; |
| 386 | |
| 387 | if (opcode->insn_size > 1) |
| 388 | { |
| 389 | if (avrdis_opcode (addr + 2, info, &insn2) != 0) |
| 390 | return -1; |
| 391 | cmd_len = 4; |
| 392 | } |
| 393 | |
| 394 | if (*constraints && *constraints != '?') |
| 395 | { |
| 396 | int regs = REGISTER_P (*constraints); |
| 397 | |
| 398 | ok = avr_operand (insn, insn2, addr, *constraints, opcode_str, op1, comment1, 0, &sym_op1, &sym_addr1); |
| 399 | |
| 400 | if (ok && *(++constraints) == ',') |
| 401 | ok = avr_operand (insn, insn2, addr, *(++constraints), opcode_str, op2, |
| 402 | *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2); |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | if (!ok) |
| 407 | { |
| 408 | /* Unknown opcode, or invalid combination of operands. */ |
| 409 | sprintf (op1, "0x%04x", insn); |
| 410 | op2[0] = 0; |
| 411 | sprintf (comment1, "????"); |
| 412 | comment2[0] = 0; |
| 413 | } |
| 414 | |
| 415 | (*prin) (stream, "%s", ok ? opcode->name : ".word"); |
| 416 | |
| 417 | if (*op1) |
| 418 | (*prin) (stream, "\t%s", op1); |
| 419 | |
| 420 | if (*op2) |
| 421 | (*prin) (stream, ", %s", op2); |
| 422 | |
| 423 | if (*comment1) |
| 424 | (*prin) (stream, "\t; %s", comment1); |
| 425 | |
| 426 | if (sym_op1) |
| 427 | info->print_address_func (sym_addr1, info); |
| 428 | |
| 429 | if (*comment2) |
| 430 | (*prin) (stream, " %s", comment2); |
| 431 | |
| 432 | if (sym_op2) |
| 433 | info->print_address_func (sym_addr2, info); |
| 434 | |
| 435 | return cmd_len; |
| 436 | } |