| 1 | /* Disassembler interface for targets using CGEN. -*- C -*- |
| 2 | CGEN: Cpu tools GENerator |
| 3 | |
| 4 | This file is used to generate m32r-dis.c. |
| 5 | |
| 6 | Copyright (C) 1996, 1997 Free Software Foundation, Inc. |
| 7 | |
| 8 | This file is part of the GNU Binutils and GDB, the GNU debugger. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2, or (at your option) |
| 13 | any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 23 | |
| 24 | #include <stdio.h> |
| 25 | #include "ansidecl.h" |
| 26 | #include "dis-asm.h" |
| 27 | #include "m32r-opc.h" |
| 28 | #include "bfd.h" |
| 29 | |
| 30 | /* ??? The layout of this stuff is still work in progress. |
| 31 | For speed in assembly/disassembly, we use inline functions. That of course |
| 32 | will only work for GCC. When this stuff is finished, we can decide whether |
| 33 | to keep the inline functions (and only get the performance increase when |
| 34 | compiled with GCC), or switch to macros, or use something else. |
| 35 | */ |
| 36 | |
| 37 | /* Default text to print if an instruction isn't recognized. */ |
| 38 | #define UNKNOWN_INSN_MSG "*unknown*" |
| 39 | |
| 40 | /* FIXME: Machine generate. */ |
| 41 | #ifndef CGEN_PCREL_OFFSET |
| 42 | #define CGEN_PCREL_OFFSET 0 |
| 43 | #endif |
| 44 | |
| 45 | static int print_insn PARAMS ((bfd_vma, disassemble_info *, char *, int)); |
| 46 | |
| 47 | static int extract_insn_normal |
| 48 | PARAMS ((const struct cgen_insn *, void *, cgen_insn_t, struct cgen_fields *)); |
| 49 | static void print_insn_normal |
| 50 | PARAMS ((void *, const struct cgen_insn *, struct cgen_fields *, bfd_vma, int)); |
| 51 | \f |
| 52 | /* Default extraction routine. |
| 53 | |
| 54 | ATTRS is a mask of the boolean attributes. We only need `unsigned', |
| 55 | but for generality we take a bitmask of all of them. */ |
| 56 | |
| 57 | static int |
| 58 | extract_normal (buf_ctrl, insn_value, attrs, start, length, shift, total_length, valuep) |
| 59 | void *buf_ctrl; |
| 60 | cgen_insn_t insn_value; |
| 61 | unsigned int attrs; |
| 62 | int start, length, shift, total_length; |
| 63 | long *valuep; |
| 64 | { |
| 65 | long value; |
| 66 | |
| 67 | #ifdef CGEN_INT_INSN |
| 68 | #if 0 |
| 69 | value = ((insn_value >> (CGEN_BASE_INSN_BITSIZE - (start + length))) |
| 70 | & ((1 << length) - 1)); |
| 71 | #else |
| 72 | value = ((insn_value >> (total_length - (start + length))) |
| 73 | & ((1 << length) - 1)); |
| 74 | #endif |
| 75 | if (! (attrs & CGEN_ATTR_MASK (CGEN_OPERAND_UNSIGNED)) |
| 76 | && (value & (1 << (length - 1)))) |
| 77 | value -= 1 << length; |
| 78 | #else |
| 79 | /* FIXME: unfinished */ |
| 80 | #endif |
| 81 | |
| 82 | /* This is backwards as we undo the effects of insert_normal. */ |
| 83 | if (shift < 0) |
| 84 | value >>= -shift; |
| 85 | else |
| 86 | value <<= shift; |
| 87 | |
| 88 | *valuep = value; |
| 89 | return 1; |
| 90 | } |
| 91 | |
| 92 | /* Default print handler. */ |
| 93 | |
| 94 | static void |
| 95 | print_normal (dis_info, value, attrs, pc, length) |
| 96 | void *dis_info; |
| 97 | long value; |
| 98 | unsigned int attrs; |
| 99 | unsigned long pc; /* FIXME: should be bfd_vma */ |
| 100 | int length; |
| 101 | { |
| 102 | disassemble_info *info = dis_info; |
| 103 | |
| 104 | /* Print the operand as directed by the attributes. */ |
| 105 | if (attrs & CGEN_ATTR_MASK (CGEN_OPERAND_FAKE)) |
| 106 | ; /* nothing to do (??? at least not yet) */ |
| 107 | else if (attrs & CGEN_ATTR_MASK (CGEN_OPERAND_PCREL_ADDR)) |
| 108 | (*info->print_address_func) (pc + CGEN_PCREL_OFFSET + value, info); |
| 109 | /* ??? Not all cases of this are currently caught. */ |
| 110 | else if (attrs & CGEN_ATTR_MASK (CGEN_OPERAND_ABS_ADDR)) |
| 111 | /* FIXME: Why & 0xffffffff? */ |
| 112 | (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info); |
| 113 | else if (attrs & CGEN_ATTR_MASK (CGEN_OPERAND_UNSIGNED)) |
| 114 | (*info->fprintf_func) (info->stream, "0x%lx", value); |
| 115 | else |
| 116 | (*info->fprintf_func) (info->stream, "%ld", value); |
| 117 | } |
| 118 | |
| 119 | /* Keyword print handler. */ |
| 120 | |
| 121 | static void |
| 122 | print_keyword (dis_info, keyword_table, value, attrs) |
| 123 | void *dis_info; |
| 124 | struct cgen_keyword *keyword_table; |
| 125 | long value; |
| 126 | CGEN_ATTR *attrs; |
| 127 | { |
| 128 | disassemble_info *info = dis_info; |
| 129 | const struct cgen_keyword_entry *ke; |
| 130 | |
| 131 | ke = cgen_keyword_lookup_value (keyword_table, value); |
| 132 | if (ke != NULL) |
| 133 | (*info->fprintf_func) (info->stream, "%s", ke->name); |
| 134 | else |
| 135 | (*info->fprintf_func) (info->stream, "???"); |
| 136 | } |
| 137 | \f |
| 138 | /* -- disassembler routines inserted here */ |
| 139 | /* -- dis.c */ |
| 140 | |
| 141 | #undef CGEN_PRINT_INSN |
| 142 | #define CGEN_PRINT_INSN my_print_insn |
| 143 | |
| 144 | static int |
| 145 | my_print_insn (pc, info, buf, buflen) |
| 146 | bfd_vma pc; |
| 147 | disassemble_info *info; |
| 148 | char *buf; |
| 149 | int buflen; |
| 150 | { |
| 151 | unsigned long insn_value; |
| 152 | |
| 153 | /* 32 bit insn? */ |
| 154 | if ((pc & 3) == 0 && (buf[0] & 0x80) != 0) |
| 155 | return print_insn (pc, info, buf, buflen); |
| 156 | |
| 157 | /* Print the first insn. */ |
| 158 | if ((pc & 3) == 0) |
| 159 | { |
| 160 | if (print_insn (pc, info, buf, 16) == 0) |
| 161 | (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG); |
| 162 | buf += 2; |
| 163 | } |
| 164 | |
| 165 | if (buf[0] & 0x80) |
| 166 | { |
| 167 | /* Parallel. */ |
| 168 | (*info->fprintf_func) (info->stream, " || "); |
| 169 | buf[0] &= 0x7f; |
| 170 | } |
| 171 | else |
| 172 | (*info->fprintf_func) (info->stream, " -> "); |
| 173 | |
| 174 | /* The "& 3" is to ensure the branch address is computed correctly |
| 175 | [if it is a branch]. */ |
| 176 | if (print_insn (pc & ~ (bfd_vma) 3, info, buf, 16) == 0) |
| 177 | (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG); |
| 178 | |
| 179 | return (pc & 3) ? 2 : 4; |
| 180 | } |
| 181 | |
| 182 | /* -- */ |
| 183 | |
| 184 | /* Main entry point for operand extraction. |
| 185 | |
| 186 | This function is basically just a big switch statement. Earlier versions |
| 187 | used tables to look up the function to use, but |
| 188 | - if the table contains both assembler and disassembler functions then |
| 189 | the disassembler contains much of the assembler and vice-versa, |
| 190 | - there's a lot of inlining possibilities as things grow, |
| 191 | - using a switch statement avoids the function call overhead. |
| 192 | |
| 193 | This function could be moved into `print_insn_normal', but keeping it |
| 194 | separate makes clear the interface between `print_insn_normal' and each of |
| 195 | the handlers. |
| 196 | */ |
| 197 | |
| 198 | CGEN_INLINE int |
| 199 | m32r_cgen_extract_operand (opindex, buf_ctrl, insn_value, fields) |
| 200 | int opindex; |
| 201 | void *buf_ctrl; |
| 202 | cgen_insn_t insn_value; |
| 203 | struct cgen_fields *fields; |
| 204 | { |
| 205 | int length; |
| 206 | |
| 207 | switch (opindex) |
| 208 | { |
| 209 | case 0 : |
| 210 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_UNSIGNED), 12, 4, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_r2); |
| 211 | break; |
| 212 | case 1 : |
| 213 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_UNSIGNED), 4, 4, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_r1); |
| 214 | break; |
| 215 | case 2 : |
| 216 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_UNSIGNED), 4, 4, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_r1); |
| 217 | break; |
| 218 | case 3 : |
| 219 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_UNSIGNED), 12, 4, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_r2); |
| 220 | break; |
| 221 | case 4 : |
| 222 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_UNSIGNED), 12, 4, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_r2); |
| 223 | break; |
| 224 | case 5 : |
| 225 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_UNSIGNED), 4, 4, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_r1); |
| 226 | break; |
| 227 | case 6 : |
| 228 | length = extract_normal (NULL /*FIXME*/, insn_value, 0, 8, 8, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_simm8); |
| 229 | break; |
| 230 | case 7 : |
| 231 | length = extract_normal (NULL /*FIXME*/, insn_value, 0, 16, 16, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_simm16); |
| 232 | break; |
| 233 | case 8 : |
| 234 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_UNSIGNED), 12, 4, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_uimm4); |
| 235 | break; |
| 236 | case 9 : |
| 237 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_UNSIGNED), 11, 5, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_uimm5); |
| 238 | break; |
| 239 | case 10 : |
| 240 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_UNSIGNED), 16, 16, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_uimm16); |
| 241 | break; |
| 242 | case 11 : |
| 243 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_SIGN_OPT)|(1<<CGEN_OPERAND_UNSIGNED), 16, 16, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_hi16); |
| 244 | break; |
| 245 | case 12 : |
| 246 | length = extract_normal (NULL /*FIXME*/, insn_value, 0, 16, 16, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_simm16); |
| 247 | break; |
| 248 | case 13 : |
| 249 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_UNSIGNED), 16, 16, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_uimm16); |
| 250 | break; |
| 251 | case 14 : |
| 252 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_ABS_ADDR)|(1<<CGEN_OPERAND_UNSIGNED), 8, 24, 0, CGEN_FIELDS_BITSIZE (fields), &fields->f_uimm24); |
| 253 | break; |
| 254 | case 15 : |
| 255 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), 8, 8, 2, CGEN_FIELDS_BITSIZE (fields), &fields->f_disp8); |
| 256 | break; |
| 257 | case 16 : |
| 258 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), 16, 16, 2, CGEN_FIELDS_BITSIZE (fields), &fields->f_disp16); |
| 259 | break; |
| 260 | case 17 : |
| 261 | length = extract_normal (NULL /*FIXME*/, insn_value, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), 8, 24, 2, CGEN_FIELDS_BITSIZE (fields), &fields->f_disp24); |
| 262 | break; |
| 263 | |
| 264 | default : |
| 265 | fprintf (stderr, "Unrecognized field %d while decoding insn.\n", |
| 266 | opindex); |
| 267 | abort (); |
| 268 | } |
| 269 | |
| 270 | return length; |
| 271 | } |
| 272 | |
| 273 | /* Main entry point for printing operands. |
| 274 | |
| 275 | This function is basically just a big switch statement. Earlier versions |
| 276 | used tables to look up the function to use, but |
| 277 | - if the table contains both assembler and disassembler functions then |
| 278 | the disassembler contains much of the assembler and vice-versa, |
| 279 | - there's a lot of inlining possibilities as things grow, |
| 280 | - using a switch statement avoids the function call overhead. |
| 281 | |
| 282 | This function could be moved into `print_insn_normal', but keeping it |
| 283 | separate makes clear the interface between `print_insn_normal' and each of |
| 284 | the handlers. |
| 285 | */ |
| 286 | |
| 287 | CGEN_INLINE void |
| 288 | m32r_cgen_print_operand (opindex, info, fields, attrs, pc, length) |
| 289 | int opindex; |
| 290 | disassemble_info *info; |
| 291 | struct cgen_fields *fields; |
| 292 | int attrs; |
| 293 | bfd_vma pc; |
| 294 | int length; |
| 295 | { |
| 296 | switch (opindex) |
| 297 | { |
| 298 | case 0 : |
| 299 | print_keyword (info, & m32r_cgen_opval_h_gr, fields->f_r2, 0|(1<<CGEN_OPERAND_UNSIGNED)); |
| 300 | break; |
| 301 | case 1 : |
| 302 | print_keyword (info, & m32r_cgen_opval_h_gr, fields->f_r1, 0|(1<<CGEN_OPERAND_UNSIGNED)); |
| 303 | break; |
| 304 | case 2 : |
| 305 | print_keyword (info, & m32r_cgen_opval_h_gr, fields->f_r1, 0|(1<<CGEN_OPERAND_UNSIGNED)); |
| 306 | break; |
| 307 | case 3 : |
| 308 | print_keyword (info, & m32r_cgen_opval_h_gr, fields->f_r2, 0|(1<<CGEN_OPERAND_UNSIGNED)); |
| 309 | break; |
| 310 | case 4 : |
| 311 | print_keyword (info, & m32r_cgen_opval_h_cr, fields->f_r2, 0|(1<<CGEN_OPERAND_UNSIGNED)); |
| 312 | break; |
| 313 | case 5 : |
| 314 | print_keyword (info, & m32r_cgen_opval_h_cr, fields->f_r1, 0|(1<<CGEN_OPERAND_UNSIGNED)); |
| 315 | break; |
| 316 | case 6 : |
| 317 | print_normal (info, fields->f_simm8, 0, pc, length); |
| 318 | break; |
| 319 | case 7 : |
| 320 | print_normal (info, fields->f_simm16, 0, pc, length); |
| 321 | break; |
| 322 | case 8 : |
| 323 | print_normal (info, fields->f_uimm4, 0|(1<<CGEN_OPERAND_UNSIGNED), pc, length); |
| 324 | break; |
| 325 | case 9 : |
| 326 | print_normal (info, fields->f_uimm5, 0|(1<<CGEN_OPERAND_UNSIGNED), pc, length); |
| 327 | break; |
| 328 | case 10 : |
| 329 | print_normal (info, fields->f_uimm16, 0|(1<<CGEN_OPERAND_UNSIGNED), pc, length); |
| 330 | break; |
| 331 | case 11 : |
| 332 | print_normal (info, fields->f_hi16, 0|(1<<CGEN_OPERAND_SIGN_OPT)|(1<<CGEN_OPERAND_UNSIGNED), pc, length); |
| 333 | break; |
| 334 | case 12 : |
| 335 | print_normal (info, fields->f_simm16, 0, pc, length); |
| 336 | break; |
| 337 | case 13 : |
| 338 | print_normal (info, fields->f_uimm16, 0|(1<<CGEN_OPERAND_UNSIGNED), pc, length); |
| 339 | break; |
| 340 | case 14 : |
| 341 | print_normal (info, fields->f_uimm24, 0|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_ABS_ADDR)|(1<<CGEN_OPERAND_UNSIGNED), pc, length); |
| 342 | break; |
| 343 | case 15 : |
| 344 | print_normal (info, fields->f_disp8, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length); |
| 345 | break; |
| 346 | case 16 : |
| 347 | print_normal (info, fields->f_disp16, 0|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length); |
| 348 | break; |
| 349 | case 17 : |
| 350 | print_normal (info, fields->f_disp24, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length); |
| 351 | break; |
| 352 | |
| 353 | default : |
| 354 | fprintf (stderr, "Unrecognized field %d while printing insn.\n", |
| 355 | opindex); |
| 356 | abort (); |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | cgen_extract_fn *m32r_cgen_extract_handlers[] = { |
| 361 | 0, /* default */ |
| 362 | extract_insn_normal, |
| 363 | }; |
| 364 | |
| 365 | cgen_print_fn *m32r_cgen_print_handlers[] = { |
| 366 | 0, /* default */ |
| 367 | print_insn_normal, |
| 368 | }; |
| 369 | |
| 370 | |
| 371 | void |
| 372 | m32r_cgen_init_dis (mach, endian) |
| 373 | int mach; |
| 374 | enum cgen_endian endian; |
| 375 | { |
| 376 | m32r_cgen_init_tables (mach); |
| 377 | cgen_set_cpu (& m32r_cgen_opcode_data, mach, endian); |
| 378 | cgen_dis_init (); |
| 379 | } |
| 380 | |
| 381 | \f |
| 382 | /* Default insn extractor. |
| 383 | |
| 384 | The extracted fields are stored in DIS_FLDS. |
| 385 | BUF_CTRL is used to handle reading variable length insns (FIXME: not done). |
| 386 | Return the length of the insn in bits, or 0 if no match. */ |
| 387 | |
| 388 | static int |
| 389 | extract_insn_normal (insn, buf_ctrl, insn_value, fields) |
| 390 | const struct cgen_insn *insn; |
| 391 | void *buf_ctrl; |
| 392 | cgen_insn_t insn_value; |
| 393 | struct cgen_fields *fields; |
| 394 | { |
| 395 | const struct cgen_syntax *syntax = CGEN_INSN_SYNTAX (insn); |
| 396 | const unsigned char *syn; |
| 397 | |
| 398 | /* ??? Some of the operand extract routines need to know the insn length, |
| 399 | which might be computed as we go. Set a default value and it'll be |
| 400 | modified as necessary. */ |
| 401 | CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn); |
| 402 | |
| 403 | CGEN_INIT_EXTRACT (); |
| 404 | |
| 405 | for (syn = syntax->syntax; *syn; ++syn) |
| 406 | { |
| 407 | int length; |
| 408 | |
| 409 | if (CGEN_SYNTAX_CHAR_P (*syn)) |
| 410 | continue; |
| 411 | |
| 412 | length = m32r_cgen_extract_operand (CGEN_SYNTAX_FIELD (*syn), |
| 413 | buf_ctrl, insn_value, fields); |
| 414 | if (length == 0) |
| 415 | return 0; |
| 416 | } |
| 417 | |
| 418 | /* We recognized and successfully extracted this insn. |
| 419 | If a length is recorded with this insn, it has a fixed length. |
| 420 | Otherwise we require the syntax string to have a fake operand which |
| 421 | sets the `length' field in `flds'. */ |
| 422 | /* FIXME: wip */ |
| 423 | if (syntax->length > 0) |
| 424 | return syntax->length; |
| 425 | return fields->length; |
| 426 | } |
| 427 | |
| 428 | /* Default insn printer. |
| 429 | |
| 430 | DIS_INFO is defined as `void *' so the disassembler needn't know anything |
| 431 | about disassemble_info. |
| 432 | */ |
| 433 | |
| 434 | static void |
| 435 | print_insn_normal (dis_info, insn, fields, pc, length) |
| 436 | void *dis_info; |
| 437 | const struct cgen_insn *insn; |
| 438 | struct cgen_fields *fields; |
| 439 | bfd_vma pc; |
| 440 | int length; |
| 441 | { |
| 442 | const struct cgen_syntax *syntax = CGEN_INSN_SYNTAX (insn); |
| 443 | disassemble_info *info = dis_info; |
| 444 | const unsigned char *syn; |
| 445 | |
| 446 | CGEN_INIT_PRINT (); |
| 447 | |
| 448 | for (syn = syntax->syntax; *syn; ++syn) |
| 449 | { |
| 450 | if (CGEN_SYNTAX_CHAR_P (*syn)) |
| 451 | { |
| 452 | (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn)); |
| 453 | continue; |
| 454 | } |
| 455 | |
| 456 | /* We have an operand. */ |
| 457 | m32r_cgen_print_operand (CGEN_SYNTAX_FIELD (*syn), info, |
| 458 | fields, CGEN_INSN_ATTRS (insn), pc, length); |
| 459 | } |
| 460 | } |
| 461 | \f |
| 462 | /* Default value for CGEN_PRINT_INSN. |
| 463 | Given BUFLEN bytes (target byte order) read into BUF, look up the |
| 464 | insn in the instruction table and disassemble it. |
| 465 | |
| 466 | The result is the size of the insn in bytes. */ |
| 467 | |
| 468 | #ifndef CGEN_PRINT_INSN |
| 469 | #define CGEN_PRINT_INSN print_insn |
| 470 | #endif |
| 471 | |
| 472 | static int |
| 473 | print_insn (pc, info, buf, buflen) |
| 474 | bfd_vma pc; |
| 475 | disassemble_info *info; |
| 476 | char *buf; |
| 477 | int buflen; |
| 478 | { |
| 479 | int i; |
| 480 | unsigned long insn_value; |
| 481 | const CGEN_INSN_LIST *insn_list; |
| 482 | |
| 483 | switch (buflen) |
| 484 | { |
| 485 | case 8: |
| 486 | insn_value = buf[0]; |
| 487 | break; |
| 488 | case 16: |
| 489 | insn_value = info->endian == BFD_ENDIAN_BIG ? bfd_getb16 (buf) : bfd_getl16 (buf); |
| 490 | break; |
| 491 | case 32: |
| 492 | insn_value = info->endian == BFD_ENDIAN_BIG ? bfd_getb32 (buf) : bfd_getl32 (buf); |
| 493 | break; |
| 494 | default: |
| 495 | abort (); |
| 496 | } |
| 497 | |
| 498 | /* The instructions are stored in hash lists. |
| 499 | Pick the first one and keep trying until we find the right one. */ |
| 500 | |
| 501 | insn_list = CGEN_DIS_LOOKUP_INSN (buf, insn_value); |
| 502 | while (insn_list != NULL) |
| 503 | { |
| 504 | const CGEN_INSN *insn = insn_list->insn; |
| 505 | const struct cgen_syntax *syntax = CGEN_INSN_SYNTAX (insn); |
| 506 | struct cgen_fields fields; |
| 507 | int length; |
| 508 | |
| 509 | #if 0 /* not needed as insn shouldn't be in hash lists if not supported */ |
| 510 | /* Supported by this cpu? */ |
| 511 | if (! m32r_cgen_insn_supported (insn)) |
| 512 | continue; |
| 513 | #endif |
| 514 | |
| 515 | /* Basic bit mask must be correct. */ |
| 516 | /* ??? May wish to allow target to defer this check until the extract |
| 517 | handler. */ |
| 518 | if ((insn_value & syntax->mask) == syntax->value) |
| 519 | { |
| 520 | /* Printing is handled in two passes. The first pass parses the |
| 521 | machine insn and extracts the fields. The second pass prints |
| 522 | them. */ |
| 523 | |
| 524 | length = (*CGEN_EXTRACT_FN (insn)) (insn, NULL, insn_value, &fields); |
| 525 | if (length > 0) |
| 526 | { |
| 527 | (*CGEN_PRINT_FN (insn)) (info, insn, &fields, pc, length); |
| 528 | /* length is in bits, result is in bytes */ |
| 529 | return length / 8; |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | insn_list = CGEN_DIS_NEXT_INSN (insn_list); |
| 534 | } |
| 535 | |
| 536 | return 0; |
| 537 | } |
| 538 | |
| 539 | /* Main entry point. |
| 540 | Print one instruction from PC on INFO->STREAM. |
| 541 | Return the size of the instruction (in bytes). */ |
| 542 | |
| 543 | int |
| 544 | print_insn_m32r (pc, info) |
| 545 | bfd_vma pc; |
| 546 | disassemble_info *info; |
| 547 | { |
| 548 | char buffer[CGEN_MAX_INSN_SIZE]; |
| 549 | int status, length; |
| 550 | static int initialized = 0; |
| 551 | static int current_mach = 0; |
| 552 | static int current_big_p = 0; |
| 553 | int mach = info->mach; |
| 554 | int big_p = info->endian == BFD_ENDIAN_BIG; |
| 555 | |
| 556 | /* If we haven't initialized yet, or if we've switched cpu's, initialize. */ |
| 557 | if (!initialized || mach != current_mach || big_p != current_big_p) |
| 558 | { |
| 559 | initialized = 1; |
| 560 | current_mach = mach; |
| 561 | current_big_p = big_p; |
| 562 | m32r_cgen_init_dis (mach, big_p ? CGEN_ENDIAN_BIG : CGEN_ENDIAN_LITTLE); |
| 563 | } |
| 564 | |
| 565 | /* Read enough of the insn so we can look it up in the hash lists. */ |
| 566 | |
| 567 | status = (*info->read_memory_func) (pc, buffer, CGEN_BASE_INSN_SIZE, info); |
| 568 | if (status != 0) |
| 569 | { |
| 570 | (*info->memory_error_func) (status, pc, info); |
| 571 | return -1; |
| 572 | } |
| 573 | |
| 574 | /* We try to have as much common code as possible. |
| 575 | But at this point some targets need to take over. */ |
| 576 | /* ??? Some targets may need a hook elsewhere. Try to avoid this, |
| 577 | but if not possible, try to move this hook elsewhere rather than |
| 578 | have two hooks. */ |
| 579 | length = CGEN_PRINT_INSN (pc, info, buffer, CGEN_BASE_INSN_BITSIZE); |
| 580 | if (length) |
| 581 | return length; |
| 582 | |
| 583 | (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG); |
| 584 | return CGEN_DEFAULT_INSN_SIZE; |
| 585 | } |