| 1 | /* xgate-dis.c -- Freescale XGATE disassembly |
| 2 | Copyright 2009, 2010, 2011 |
| 3 | Free Software Foundation, Inc. |
| 4 | Written by Sean Keys (skeys@ipdatasys.com) |
| 5 | |
| 6 | This file is part of the GNU opcodes library. |
| 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 | |
| 24 | #include <assert.h> |
| 25 | #include "sysdep.h" |
| 26 | #include "dis-asm.h" |
| 27 | #include "opintl.h" |
| 28 | #include "libiberty.h" |
| 29 | #include "ansidecl.h" |
| 30 | #include "opcode/xgate.h" |
| 31 | |
| 32 | #define XGATE_TWO_BYTES 0x02 |
| 33 | #define XGATE_NINE_BITS 0x1FF |
| 34 | #define XGATE_TEN_BITS 0x3FF |
| 35 | #define XGATE_NINE_SIGNBIT 0x100 |
| 36 | #define XGATE_TEN_SIGNBIT 0x200 |
| 37 | |
| 38 | /* Structures */ |
| 39 | struct decodeInfo { |
| 40 | unsigned int operMask; |
| 41 | unsigned int operMasksRegisterBits; |
| 42 | struct xgate_opcode *opcodePTR; |
| 43 | }; |
| 44 | |
| 45 | /* Prototypes for local functions. */ |
| 46 | static int |
| 47 | print_insn( bfd_vma, struct disassemble_info *); |
| 48 | static int |
| 49 | read_memory( bfd_vma, bfd_byte*, int, struct disassemble_info *); |
| 50 | static int |
| 51 | ripBits(unsigned int *, int, |
| 52 | struct xgate_opcode *, unsigned int); |
| 53 | int |
| 54 | macro_search(char *, char *); |
| 55 | struct decodeInfo * |
| 56 | find_match(unsigned int raw_code); |
| 57 | |
| 58 | /* statics */ |
| 59 | static struct decodeInfo *decodeTable; |
| 60 | static int initialized; |
| 61 | static char previousOpName[10]; |
| 62 | static unsigned int perviousBin; |
| 63 | |
| 64 | /* Disassemble one instruction at address 'memaddr'. Returns the number |
| 65 | of bytes used by that instruction. */ |
| 66 | static int |
| 67 | print_insn (bfd_vma memaddr, struct disassemble_info* info) |
| 68 | { |
| 69 | int status; |
| 70 | unsigned int raw_code; |
| 71 | char *s = 0; |
| 72 | long bytesRead = 0; |
| 73 | int i = 0; |
| 74 | struct xgate_opcode *opcodePTR = (struct xgate_opcode*) xgate_opcodes; |
| 75 | struct decodeInfo *decodeTablePTR = 0; |
| 76 | struct decodeInfo *decodePTR = 0; |
| 77 | unsigned int operandRegisterBits = 0; |
| 78 | signed int relAddr = 0; |
| 79 | signed int operandOne = 0; |
| 80 | signed int operandTwo = 0; |
| 81 | bfd_byte buffer[4]; |
| 82 | bfd_vma absAddress; |
| 83 | |
| 84 | unsigned int operMaskReg = 0; |
| 85 | /* initialize our array of opcode masks and check them against our constant |
| 86 | table */ |
| 87 | if (!initialized) |
| 88 | { |
| 89 | decodeTable = xmalloc(sizeof(struct decodeInfo) * xgate_num_opcodes); |
| 90 | for (i = 0, decodeTablePTR = decodeTable; i < xgate_num_opcodes; |
| 91 | i++, decodeTablePTR++, opcodePTR++) |
| 92 | { |
| 93 | unsigned int bin = 0; |
| 94 | unsigned int mask = 0; |
| 95 | for (s = opcodePTR->format; *s; s++) |
| 96 | { |
| 97 | bin <<= 1; |
| 98 | mask <<= 1; |
| 99 | operandRegisterBits <<= 1; |
| 100 | bin |= (*s == '1'); |
| 101 | mask |= (*s == '0' || *s == '1'); |
| 102 | operandRegisterBits |= (*s == 'r'); |
| 103 | } |
| 104 | /* asserting will uncover inconsistencies in our table */ |
| 105 | assert( |
| 106 | (s - opcodePTR->format) == 16 || (s - opcodePTR->format) == 32); |
| 107 | assert(opcodePTR->bin_opcode == bin); |
| 108 | decodeTablePTR->operMask = mask; |
| 109 | decodeTablePTR->operMasksRegisterBits = operandRegisterBits; |
| 110 | decodeTablePTR->opcodePTR = opcodePTR; |
| 111 | } |
| 112 | initialized = 1; |
| 113 | } |
| 114 | /* read 16 bits */ |
| 115 | bytesRead += XGATE_TWO_BYTES; |
| 116 | status = read_memory(memaddr, buffer, XGATE_TWO_BYTES, info); |
| 117 | if (status == 0) |
| 118 | { |
| 119 | raw_code = buffer[0]; |
| 120 | raw_code <<= 8; |
| 121 | raw_code += buffer[1]; |
| 122 | |
| 123 | decodePTR = find_match(raw_code); |
| 124 | if (decodePTR) |
| 125 | { |
| 126 | operMaskReg = decodePTR->operMasksRegisterBits; |
| 127 | (*info->fprintf_func)(info->stream, "%s", decodePTR->opcodePTR->name); |
| 128 | /* First we compare the shorthand format of the constraints. If we |
| 129 | still are unable to pinpoint the operands |
| 130 | we analyze the opcodes constraint string. */ |
| 131 | switch (decodePTR->opcodePTR->sh_format) |
| 132 | { |
| 133 | case XG_R_C: |
| 134 | (*info->fprintf_func)(info->stream, " R%x, CCR", |
| 135 | (raw_code >> 8) & 0x7); |
| 136 | break; |
| 137 | case XG_C_R: |
| 138 | (*info->fprintf_func)(info->stream, " CCR, R%x", |
| 139 | (raw_code >> 8) & 0x7); |
| 140 | break; |
| 141 | case XG_R_P: |
| 142 | (*info->fprintf_func)(info->stream, " R%x, PC", |
| 143 | (raw_code >> 8) & 0x7); |
| 144 | break; |
| 145 | case XG_INH: |
| 146 | break; |
| 147 | case XG_R_R_R: |
| 148 | if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_TRI)) |
| 149 | { |
| 150 | (*info->fprintf_func)(info->stream, " R%x, R%x, R%x", |
| 151 | (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, |
| 152 | (raw_code >> 2) & 0x7); |
| 153 | } |
| 154 | else if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_IDR)) |
| 155 | { |
| 156 | if (raw_code & 0x01) |
| 157 | { |
| 158 | (*info->fprintf_func)(info->stream, " R%x, (R%x, R%x+)", |
| 159 | (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, |
| 160 | (raw_code >> 2) & 0x7); |
| 161 | } |
| 162 | else if (raw_code & 0x02) |
| 163 | { |
| 164 | (*info->fprintf_func)(info->stream, " R%x, (R%x, -R%x)", |
| 165 | (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, |
| 166 | (raw_code >> 2) & 0x7); |
| 167 | } |
| 168 | else |
| 169 | { |
| 170 | (*info->fprintf_func)(info->stream, " R%x, (R%x, R%x)", |
| 171 | (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, |
| 172 | (raw_code >> 2) & 0x7); |
| 173 | } |
| 174 | } |
| 175 | else |
| 176 | { |
| 177 | (*info->fprintf_func)(info->stream, " unhandled mode %s", |
| 178 | decodePTR->opcodePTR->constraints); |
| 179 | } |
| 180 | break; |
| 181 | case XG_R_R: |
| 182 | if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_DYA_MON)) |
| 183 | { |
| 184 | operandOne = ripBits(&operMaskReg, 3, decodePTR->opcodePTR, |
| 185 | raw_code); |
| 186 | operandTwo = ripBits(&operMaskReg, 3, decodePTR->opcodePTR, |
| 187 | raw_code); |
| 188 | (*info->fprintf_func)(info->stream, " R%x, R%x", operandOne, |
| 189 | operandTwo); |
| 190 | } |
| 191 | else if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_DYA)) |
| 192 | { |
| 193 | operandOne = ripBits(&operMaskReg, 3, opcodePTR, raw_code); |
| 194 | operandTwo = ripBits(&operMaskReg, 3, opcodePTR, raw_code); |
| 195 | (*info->fprintf_func)(info->stream, " R%x, R%x", operandOne, |
| 196 | operandTwo); |
| 197 | } |
| 198 | else |
| 199 | { |
| 200 | (*info->fprintf_func)(info->stream, " unhandled mode %s", |
| 201 | opcodePTR->constraints); |
| 202 | } |
| 203 | break; |
| 204 | case XG_R_R_I: |
| 205 | (*info->fprintf_func)(info->stream, " R%x, (R%x, #0x%x)", |
| 206 | (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, raw_code & 0x1f); |
| 207 | break; |
| 208 | case XG_R: |
| 209 | operandOne = ripBits(&operMaskReg, 3, decodePTR->opcodePTR, |
| 210 | raw_code); |
| 211 | (*info->fprintf_func)(info->stream, " R%x", operandOne); |
| 212 | break; |
| 213 | case XG_I | XG_PCREL: |
| 214 | if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_REL9)) |
| 215 | { |
| 216 | /* if address is negative handle it accordingly */ |
| 217 | if (raw_code & XGATE_NINE_SIGNBIT) |
| 218 | { |
| 219 | relAddr = XGATE_NINE_BITS >> 1; /* clip sign bit */ |
| 220 | relAddr = ~relAddr; /* make signed */ |
| 221 | relAddr |= (raw_code & 0xFF) + 1; /* apply our value */ |
| 222 | relAddr <<= 1; /* multiply by two as per processor docs */ |
| 223 | } |
| 224 | else |
| 225 | { |
| 226 | relAddr = raw_code & 0xff; |
| 227 | relAddr = (relAddr << 1) + 2; |
| 228 | } |
| 229 | (*info->fprintf_func)(info->stream, " *%d", relAddr); |
| 230 | (*info->fprintf_func)(info->stream, " Abs* 0x"); |
| 231 | (*info->print_address_func)(memaddr + relAddr, info); |
| 232 | } |
| 233 | else if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_REL10)) |
| 234 | { |
| 235 | /* if address is negative handle it accordingly */ |
| 236 | if (raw_code & XGATE_TEN_SIGNBIT) |
| 237 | { |
| 238 | relAddr = XGATE_TEN_BITS >> 1; /* clip sign bit */ |
| 239 | relAddr = ~relAddr; /* make signed */ |
| 240 | relAddr |= (raw_code & 0x1FF) + 1; /* apply our value */ |
| 241 | relAddr <<= 1; /* multiply by two as per processor docs */ |
| 242 | } |
| 243 | else |
| 244 | { |
| 245 | relAddr = raw_code & 0x1FF; |
| 246 | relAddr = (relAddr << 1) + 2; |
| 247 | } |
| 248 | (*info->fprintf_func)(info->stream, " *%d", relAddr); |
| 249 | (*info->fprintf_func)(info->stream, " Abs* 0x"); |
| 250 | (*info->print_address_func)(memaddr + relAddr, info); |
| 251 | } |
| 252 | else |
| 253 | { |
| 254 | (*info->fprintf_func)(info->stream, |
| 255 | " Can't disassemble for mode) %s", |
| 256 | decodePTR->opcodePTR->constraints); |
| 257 | } |
| 258 | break; |
| 259 | case XG_R_I: |
| 260 | if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_IMM4)) |
| 261 | { |
| 262 | (*info->fprintf_func)(info->stream, " R%x, #0x%02x", |
| 263 | (raw_code >> 8) & 0x7, (raw_code >> 4) & 0xF); |
| 264 | } |
| 265 | else if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_IMM8)) |
| 266 | { |
| 267 | if (macro_search(decodePTR->opcodePTR->name, previousOpName) && |
| 268 | previousOpName[0]) |
| 269 | { |
| 270 | absAddress = (0xFF & raw_code) << 8; |
| 271 | absAddress |= perviousBin & 0xFF; |
| 272 | (*info->fprintf_func)(info->stream, " R%x, #0x%02x Abs* 0x", |
| 273 | (raw_code >> 8) & 0x7, raw_code & 0xff); |
| 274 | (*info->print_address_func)(absAddress, info); |
| 275 | previousOpName[0] = 0; |
| 276 | } |
| 277 | else |
| 278 | { |
| 279 | strcpy(previousOpName, decodePTR->opcodePTR->name); |
| 280 | (*info->fprintf_func)(info->stream, " R%x, #0x%02x", |
| 281 | (raw_code >> 8) & 0x7, raw_code & 0xff); |
| 282 | } |
| 283 | } |
| 284 | else |
| 285 | { |
| 286 | (*info->fprintf_func)(info->stream, |
| 287 | " Can't disassemble for mode %s", |
| 288 | decodePTR->opcodePTR->constraints); |
| 289 | } |
| 290 | break; |
| 291 | case XG_I: |
| 292 | (*info->fprintf_func)(info->stream, " #0x%x", |
| 293 | (raw_code >> 8) & 0x7); |
| 294 | break; |
| 295 | default: |
| 296 | (*info->fprintf_func)(info->stream, "address mode not found\t %x", |
| 297 | opcodePTR->bin_opcode); |
| 298 | break; |
| 299 | } |
| 300 | perviousBin = raw_code; |
| 301 | } |
| 302 | else |
| 303 | { |
| 304 | (*info->fprintf_func)(info->stream, |
| 305 | " unable to find opcode match #0%x", raw_code); |
| 306 | } |
| 307 | } |
| 308 | return bytesRead; |
| 309 | } |
| 310 | |
| 311 | int |
| 312 | print_insn_xgate (bfd_vma memaddr, struct disassemble_info* info) |
| 313 | { |
| 314 | return print_insn (memaddr, info); |
| 315 | } |
| 316 | |
| 317 | static int |
| 318 | read_memory (bfd_vma memaddr, bfd_byte* buffer, int size, |
| 319 | struct disassemble_info* info) |
| 320 | { |
| 321 | int status; |
| 322 | status = (*info->read_memory_func) (memaddr, buffer, size, info); |
| 323 | if (status != 0) |
| 324 | { |
| 325 | (*info->memory_error_func) (status, memaddr, info); |
| 326 | return -1; |
| 327 | } |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | static int |
| 332 | ripBits(unsigned int *operandBitsRemaining, int numBitsRequested, |
| 333 | struct xgate_opcode *opcodePTR, unsigned int memory) |
| 334 | { |
| 335 | unsigned int currentBit; |
| 336 | int operand; |
| 337 | int numBitsFound; |
| 338 | for (operand = 0, numBitsFound = 0, currentBit = 1 |
| 339 | << ((opcodePTR->size * 8) - 1); |
| 340 | (numBitsFound < numBitsRequested) && currentBit; currentBit >>= 1) |
| 341 | { |
| 342 | if(currentBit & *operandBitsRemaining) { |
| 343 | *operandBitsRemaining &= ~(currentBit); /* consume the current bit */ |
| 344 | operand <<= 1; /* make room for our next bit */ |
| 345 | numBitsFound++; |
| 346 | operand |= (currentBit & memory) > 0; |
| 347 | } |
| 348 | } |
| 349 | return operand; |
| 350 | } |
| 351 | |
| 352 | int |
| 353 | macro_search(char *currentName, char *lastName) |
| 354 | { |
| 355 | int i; |
| 356 | int length = 0; |
| 357 | char *where; |
| 358 | for (i = 0; i < xgate_num_opcodes; i++) |
| 359 | { |
| 360 | where = strstr(xgate_opcodes[i].constraints, lastName); |
| 361 | if (where) |
| 362 | { |
| 363 | length = strlen(where); |
| 364 | } |
| 365 | if (length) |
| 366 | { |
| 367 | where = strstr(xgate_opcodes[i].constraints, currentName); |
| 368 | if (where) |
| 369 | { |
| 370 | length = strlen(where); |
| 371 | return 1; |
| 372 | } |
| 373 | } |
| 374 | } |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | struct decodeInfo* |
| 379 | find_match(unsigned int raw_code) |
| 380 | { |
| 381 | struct decodeInfo *decodeTablePTR = 0; |
| 382 | int i; |
| 383 | |
| 384 | for (i = 0, decodeTablePTR = decodeTable; i < xgate_num_opcodes; |
| 385 | i++, decodeTablePTR++) |
| 386 | { |
| 387 | if ((raw_code & decodeTablePTR->operMask) |
| 388 | == decodeTablePTR->opcodePTR->bin_opcode) |
| 389 | { |
| 390 | /* make sure we didn't run into a macro or alias */ |
| 391 | if (decodeTablePTR->opcodePTR->cycles_min != 0) |
| 392 | { |
| 393 | return decodeTablePTR; |
| 394 | break; |
| 395 | } |
| 396 | else |
| 397 | { |
| 398 | continue; |
| 399 | } |
| 400 | } |
| 401 | } |
| 402 | return 0; |
| 403 | } |