| 1 | /* xgate-dis.c -- Freescale XGATE disassembly |
| 2 | Copyright (C) 2009-2020 Free Software Foundation, Inc. |
| 3 | Written by Sean Keys (skeys@ipdatasys.com) |
| 4 | |
| 5 | This file is part of the GNU opcodes library. |
| 6 | |
| 7 | This library is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | It is distributed in the hope that it will be useful, but WITHOUT |
| 13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
| 15 | License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include <assert.h> |
| 24 | #include "disassemble.h" |
| 25 | #include "opintl.h" |
| 26 | #include "libiberty.h" |
| 27 | #include "ansidecl.h" |
| 28 | #include "opcode/xgate.h" |
| 29 | |
| 30 | #define XGATE_TWO_BYTES 0x02 |
| 31 | #define XGATE_NINE_BITS 0x1FF |
| 32 | #define XGATE_TEN_BITS 0x3FF |
| 33 | #define XGATE_NINE_SIGNBIT 0x100 |
| 34 | #define XGATE_TEN_SIGNBIT 0x200 |
| 35 | |
| 36 | /* Structures. */ |
| 37 | struct decodeInfo |
| 38 | { |
| 39 | unsigned int operMask; |
| 40 | unsigned int operMasksRegisterBits; |
| 41 | struct xgate_opcode *opcodePTR; |
| 42 | }; |
| 43 | |
| 44 | /* Prototypes for local functions. */ |
| 45 | static int print_insn (bfd_vma, struct disassemble_info *); |
| 46 | static int read_memory (bfd_vma, bfd_byte*, int, struct disassemble_info *); |
| 47 | static int ripBits (unsigned int *, int, |
| 48 | struct xgate_opcode *, unsigned int); |
| 49 | static int macro_search (char *, char *); |
| 50 | static struct decodeInfo * find_match (unsigned int); |
| 51 | |
| 52 | /* Statics. */ |
| 53 | static struct decodeInfo *decodeTable; |
| 54 | static int initialized; |
| 55 | static char previousOpName[10]; |
| 56 | static unsigned int perviousBin; |
| 57 | |
| 58 | /* Disassemble one instruction at address 'memaddr'. Returns the number |
| 59 | of bytes used by that instruction. */ |
| 60 | |
| 61 | static int |
| 62 | print_insn (bfd_vma memaddr, struct disassemble_info* info) |
| 63 | { |
| 64 | int status; |
| 65 | unsigned int raw_code; |
| 66 | char *s = 0; |
| 67 | long bytesRead = 0; |
| 68 | int i = 0; |
| 69 | struct xgate_opcode *opcodePTR = (struct xgate_opcode*) xgate_opcodes; |
| 70 | struct decodeInfo *decodeTablePTR = 0; |
| 71 | struct decodeInfo *decodePTR = 0; |
| 72 | unsigned int operandRegisterBits = 0; |
| 73 | signed int relAddr = 0; |
| 74 | signed int operandOne = 0; |
| 75 | signed int operandTwo = 0; |
| 76 | bfd_byte buffer[4]; |
| 77 | bfd_vma absAddress; |
| 78 | |
| 79 | unsigned int operMaskReg = 0; |
| 80 | /* Initialize our array of opcode masks and check them against our constant |
| 81 | table. */ |
| 82 | if (!initialized) |
| 83 | { |
| 84 | decodeTable = xmalloc (sizeof (struct decodeInfo) * xgate_num_opcodes); |
| 85 | for (i = 0, decodeTablePTR = decodeTable; i < xgate_num_opcodes; |
| 86 | i++, decodeTablePTR++, opcodePTR++) |
| 87 | { |
| 88 | unsigned int bin = 0; |
| 89 | unsigned int mask = 0; |
| 90 | for (s = opcodePTR->format; *s; s++) |
| 91 | { |
| 92 | bin <<= 1; |
| 93 | mask <<= 1; |
| 94 | operandRegisterBits <<= 1; |
| 95 | bin |= (*s == '1'); |
| 96 | mask |= (*s == '0' || *s == '1'); |
| 97 | operandRegisterBits |= (*s == 'r'); |
| 98 | } |
| 99 | /* Asserting will uncover inconsistencies in our table. */ |
| 100 | assert ((s - opcodePTR->format) == 16 || (s - opcodePTR->format) == 32); |
| 101 | assert (opcodePTR->bin_opcode == bin); |
| 102 | |
| 103 | decodeTablePTR->operMask = mask; |
| 104 | decodeTablePTR->operMasksRegisterBits = operandRegisterBits; |
| 105 | decodeTablePTR->opcodePTR = opcodePTR; |
| 106 | } |
| 107 | initialized = 1; |
| 108 | } |
| 109 | |
| 110 | /* Read 16 bits. */ |
| 111 | bytesRead += XGATE_TWO_BYTES; |
| 112 | status = read_memory (memaddr, buffer, XGATE_TWO_BYTES, info); |
| 113 | if (status == 0) |
| 114 | { |
| 115 | raw_code = buffer[0]; |
| 116 | raw_code <<= 8; |
| 117 | raw_code += buffer[1]; |
| 118 | |
| 119 | decodePTR = find_match (raw_code); |
| 120 | if (decodePTR) |
| 121 | { |
| 122 | operMaskReg = decodePTR->operMasksRegisterBits; |
| 123 | (*info->fprintf_func)(info->stream, "%s", decodePTR->opcodePTR->name); |
| 124 | |
| 125 | /* First we compare the shorthand format of the constraints. If we |
| 126 | still are unable to pinpoint the operands |
| 127 | we analyze the opcodes constraint string. */ |
| 128 | if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON_R_C)) |
| 129 | { |
| 130 | (*info->fprintf_func)(info->stream, " R%x, CCR", |
| 131 | (raw_code >> 8) & 0x7); |
| 132 | } |
| 133 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON_C_R)) |
| 134 | { |
| 135 | (*info->fprintf_func)(info->stream, " CCR, R%x", |
| 136 | (raw_code >> 8) & 0x7); |
| 137 | } |
| 138 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON_R_P)) |
| 139 | { |
| 140 | (*info->fprintf_func)(info->stream, " R%x, PC", |
| 141 | (raw_code >> 8) & 0x7); |
| 142 | } |
| 143 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_TRI)) |
| 144 | { |
| 145 | (*info->fprintf_func)(info->stream, " R%x, R%x, R%x", |
| 146 | (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, |
| 147 | (raw_code >> 2) & 0x7); |
| 148 | } |
| 149 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IDR)) |
| 150 | { |
| 151 | if (raw_code & 0x01) |
| 152 | { |
| 153 | (*info->fprintf_func)(info->stream, " R%x, (R%x, R%x+)", |
| 154 | (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, |
| 155 | (raw_code >> 2) & 0x7); |
| 156 | } |
| 157 | else if (raw_code & 0x02) |
| 158 | { |
| 159 | (*info->fprintf_func)(info->stream, " R%x, (R%x, -R%x)", |
| 160 | (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, |
| 161 | (raw_code >> 2) & 0x7); |
| 162 | } |
| 163 | else |
| 164 | { |
| 165 | (*info->fprintf_func)(info->stream, " R%x, (R%x, R%x)", |
| 166 | (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, |
| 167 | (raw_code >> 2) & 0x7); |
| 168 | } |
| 169 | } |
| 170 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_DYA)) |
| 171 | { |
| 172 | operandOne = ripBits (&operMaskReg, 3, decodePTR->opcodePTR, raw_code); |
| 173 | operandTwo = ripBits (&operMaskReg, 3, decodePTR->opcodePTR, raw_code); |
| 174 | ( *info->fprintf_func)(info->stream, " R%x, R%x", operandOne, |
| 175 | operandTwo); |
| 176 | } |
| 177 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IDO5)) |
| 178 | { |
| 179 | (*info->fprintf_func)(info->stream, " R%x, (R%x, #0x%x)", |
| 180 | (raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, raw_code & 0x1f); |
| 181 | } |
| 182 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_MON)) |
| 183 | { |
| 184 | operandOne = ripBits (&operMaskReg, 3, decodePTR->opcodePTR, |
| 185 | raw_code); |
| 186 | (*info->fprintf_func)(info->stream, " R%x", operandOne); |
| 187 | } |
| 188 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_REL9)) |
| 189 | { |
| 190 | /* If address is negative handle it accordingly. */ |
| 191 | if (raw_code & XGATE_NINE_SIGNBIT) |
| 192 | { |
| 193 | relAddr = XGATE_NINE_BITS >> 1; /* Clip sign bit. */ |
| 194 | relAddr = ~relAddr; /* Make signed. */ |
| 195 | relAddr |= (raw_code & 0xFF) + 1; /* Apply our value. */ |
| 196 | relAddr *= 2; /* Multiply by two as per processor docs. */ |
| 197 | } |
| 198 | else |
| 199 | { |
| 200 | relAddr = raw_code & 0xff; |
| 201 | relAddr = relAddr * 2 + 2; |
| 202 | } |
| 203 | (*info->fprintf_func)(info->stream, " *%d", relAddr); |
| 204 | (*info->fprintf_func)(info->stream, " Abs* 0x"); |
| 205 | (*info->print_address_func)(memaddr + relAddr, info); |
| 206 | } |
| 207 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_REL10)) |
| 208 | { |
| 209 | /* If address is negative handle it accordingly. */ |
| 210 | if (raw_code & XGATE_TEN_SIGNBIT) |
| 211 | { |
| 212 | relAddr = XGATE_TEN_BITS >> 1; /* Clip sign bit. */ |
| 213 | relAddr = ~relAddr; /* Make signed. */ |
| 214 | relAddr |= (raw_code & 0x1FF) + 1; /* Apply our value. */ |
| 215 | relAddr *= 2; /* Multiply by two as per processor docs. */ |
| 216 | } |
| 217 | else |
| 218 | { |
| 219 | relAddr = raw_code & 0x1FF; |
| 220 | relAddr = relAddr * 2 + 2; |
| 221 | } |
| 222 | (*info->fprintf_func)(info->stream, " *%d", relAddr); |
| 223 | (*info->fprintf_func)(info->stream, " Abs* 0x"); |
| 224 | (*info->print_address_func)(memaddr + relAddr, info); |
| 225 | } |
| 226 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IMM4)) |
| 227 | { |
| 228 | (*info->fprintf_func)(info->stream, " R%x, #0x%02x", |
| 229 | (raw_code >> 8) & 0x7, (raw_code >> 4) & 0xF); |
| 230 | } |
| 231 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IMM8)) |
| 232 | { |
| 233 | if (macro_search (decodePTR->opcodePTR->name, previousOpName) && |
| 234 | previousOpName[0]) |
| 235 | { |
| 236 | absAddress = (0xFF & raw_code) << 8; |
| 237 | absAddress |= perviousBin & 0xFF; |
| 238 | (*info->fprintf_func)(info->stream, " R%x, #0x%02x Abs* 0x", |
| 239 | (raw_code >> 8) & 0x7, raw_code & 0xff); |
| 240 | (*info->print_address_func)(absAddress, info); |
| 241 | previousOpName[0] = 0; |
| 242 | } |
| 243 | else |
| 244 | { |
| 245 | strcpy (previousOpName, decodePTR->opcodePTR->name); |
| 246 | (*info->fprintf_func)(info->stream, " R%x, #0x%02x", |
| 247 | (raw_code >> 8) & 0x7, raw_code & 0xff); |
| 248 | } |
| 249 | } |
| 250 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IMM3)) |
| 251 | { |
| 252 | (*info->fprintf_func)(info->stream, " #0x%x", |
| 253 | (raw_code >> 8) & 0x7); |
| 254 | } |
| 255 | else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_INH)) |
| 256 | { |
| 257 | // |
| 258 | } |
| 259 | else |
| 260 | { |
| 261 | (*info->fprintf_func)(info->stream, " unhandled mode %s", |
| 262 | decodePTR->opcodePTR->constraints); |
| 263 | } |
| 264 | perviousBin = raw_code; |
| 265 | } |
| 266 | else |
| 267 | { |
| 268 | (*info->fprintf_func)(info->stream, |
| 269 | " unable to find opcode match #0%x", raw_code); |
| 270 | } |
| 271 | } |
| 272 | return bytesRead; |
| 273 | } |
| 274 | |
| 275 | int |
| 276 | print_insn_xgate (bfd_vma memaddr, struct disassemble_info* info) |
| 277 | { |
| 278 | return print_insn (memaddr, info); |
| 279 | } |
| 280 | |
| 281 | static int |
| 282 | read_memory (bfd_vma memaddr, bfd_byte* buffer, int size, |
| 283 | struct disassemble_info* info) |
| 284 | { |
| 285 | int status; |
| 286 | status = (*info->read_memory_func) (memaddr, buffer, size, info); |
| 287 | if (status != 0) |
| 288 | { |
| 289 | (*info->memory_error_func) (status, memaddr, info); |
| 290 | return -1; |
| 291 | } |
| 292 | return 0; |
| 293 | } |
| 294 | |
| 295 | static int |
| 296 | ripBits (unsigned int *operandBitsRemaining, |
| 297 | int numBitsRequested, |
| 298 | struct xgate_opcode *opcodePTR, |
| 299 | unsigned int memory) |
| 300 | { |
| 301 | unsigned int currentBit; |
| 302 | unsigned int operand = 0; |
| 303 | int numBitsFound; |
| 304 | |
| 305 | for (numBitsFound = 0, currentBit = 1u << ((opcodePTR->size * 8) - 1); |
| 306 | numBitsFound < numBitsRequested && currentBit != 0; |
| 307 | currentBit >>= 1) |
| 308 | { |
| 309 | if (currentBit & *operandBitsRemaining) |
| 310 | { |
| 311 | *operandBitsRemaining &= ~(currentBit); /* Consume the current bit. */ |
| 312 | operand <<= 1; /* Make room for our next bit. */ |
| 313 | numBitsFound++; |
| 314 | operand |= (currentBit & memory) > 0; |
| 315 | } |
| 316 | } |
| 317 | return operand; |
| 318 | } |
| 319 | |
| 320 | static int |
| 321 | macro_search (char *currentName, char *lastName) |
| 322 | { |
| 323 | int i; |
| 324 | int length = 0; |
| 325 | char *where; |
| 326 | |
| 327 | for (i = 0; i < xgate_num_opcodes; i++) |
| 328 | { |
| 329 | where = strstr (xgate_opcodes[i].constraints, lastName); |
| 330 | |
| 331 | if (where) |
| 332 | { |
| 333 | length = strlen (where); |
| 334 | } |
| 335 | if (length) |
| 336 | { |
| 337 | where = strstr (xgate_opcodes[i].constraints, currentName); |
| 338 | if (where) |
| 339 | { |
| 340 | length = strlen (where); |
| 341 | return 1; |
| 342 | } |
| 343 | } |
| 344 | } |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | static struct decodeInfo * |
| 349 | find_match (unsigned int raw_code) |
| 350 | { |
| 351 | struct decodeInfo *decodeTablePTR = 0; |
| 352 | int i; |
| 353 | |
| 354 | for (i = 0, decodeTablePTR = decodeTable; i < xgate_num_opcodes; |
| 355 | i++, decodeTablePTR++) |
| 356 | { |
| 357 | if ((raw_code & decodeTablePTR->operMask) |
| 358 | == decodeTablePTR->opcodePTR->bin_opcode) |
| 359 | { |
| 360 | /* Make sure we didn't run into a macro or alias. */ |
| 361 | if (decodeTablePTR->opcodePTR->cycles_min != 0) |
| 362 | { |
| 363 | return decodeTablePTR; |
| 364 | break; |
| 365 | } |
| 366 | else |
| 367 | continue; |
| 368 | } |
| 369 | } |
| 370 | return 0; |
| 371 | } |