| 1 | /* GAS interface for targets using CGEN: Cpu tools GENerator. |
| 2 | Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GAS, the GNU Assembler. |
| 6 | |
| 7 | GAS 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 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GAS is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GAS; see the file COPYING. If not, write to the Free Software |
| 19 | Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 20 | |
| 21 | #include <setjmp.h> |
| 22 | #include "ansidecl.h" |
| 23 | #include "libiberty.h" |
| 24 | #include "bfd.h" |
| 25 | #include "symcat.h" |
| 26 | #include "cgen-desc.h" |
| 27 | #include "as.h" |
| 28 | #include "subsegs.h" |
| 29 | #include "cgen.h" |
| 30 | #include "dwarf2dbg.h" |
| 31 | |
| 32 | static void queue_fixup (int, int, expressionS *); |
| 33 | |
| 34 | /* Opcode table descriptor, must be set by md_begin. */ |
| 35 | |
| 36 | CGEN_CPU_DESC gas_cgen_cpu_desc; |
| 37 | |
| 38 | /* Callback to insert a register into the symbol table. |
| 39 | A target may choose to let GAS parse the registers. |
| 40 | ??? Not currently used. */ |
| 41 | |
| 42 | void |
| 43 | cgen_asm_record_register (name, number) |
| 44 | char *name; |
| 45 | int number; |
| 46 | { |
| 47 | /* Use symbol_create here instead of symbol_new so we don't try to |
| 48 | output registers into the object file's symbol table. */ |
| 49 | symbol_table_insert (symbol_create (name, reg_section, |
| 50 | number, &zero_address_frag)); |
| 51 | } |
| 52 | |
| 53 | /* We need to keep a list of fixups. We can't simply generate them as |
| 54 | we go, because that would require us to first create the frag, and |
| 55 | that would screw up references to ``.''. |
| 56 | |
| 57 | This is used by cpu's with simple operands. It keeps knowledge of what |
| 58 | an `expressionS' is and what a `fixup' is out of CGEN which for the time |
| 59 | being is preferable. |
| 60 | |
| 61 | OPINDEX is the index in the operand table. |
| 62 | OPINFO is something the caller chooses to help in reloc determination. */ |
| 63 | |
| 64 | struct fixup |
| 65 | { |
| 66 | int opindex; |
| 67 | int opinfo; |
| 68 | expressionS exp; |
| 69 | }; |
| 70 | |
| 71 | static struct fixup fixups[GAS_CGEN_MAX_FIXUPS]; |
| 72 | static int num_fixups; |
| 73 | |
| 74 | /* Prepare to parse an instruction. |
| 75 | ??? May wish to make this static and delete calls in md_assemble. */ |
| 76 | |
| 77 | void |
| 78 | gas_cgen_init_parse () |
| 79 | { |
| 80 | num_fixups = 0; |
| 81 | } |
| 82 | |
| 83 | /* Queue a fixup. */ |
| 84 | |
| 85 | static void |
| 86 | queue_fixup (opindex, opinfo, expP) |
| 87 | int opindex; |
| 88 | int opinfo; |
| 89 | expressionS * expP; |
| 90 | { |
| 91 | /* We need to generate a fixup for this expression. */ |
| 92 | if (num_fixups >= GAS_CGEN_MAX_FIXUPS) |
| 93 | as_fatal (_("too many fixups")); |
| 94 | fixups[num_fixups].exp = *expP; |
| 95 | fixups[num_fixups].opindex = opindex; |
| 96 | fixups[num_fixups].opinfo = opinfo; |
| 97 | ++ num_fixups; |
| 98 | } |
| 99 | |
| 100 | /* The following functions allow fixup chains to be stored, retrieved, |
| 101 | and swapped. They are a generalization of a pre-existing scheme |
| 102 | for storing, restoring and swapping fixup chains that was used by |
| 103 | the m32r port. The functionality is essentially the same, only |
| 104 | instead of only being able to store a single fixup chain, an entire |
| 105 | array of fixup chains can be stored. It is the user's responsibility |
| 106 | to keep track of how many fixup chains have been stored and which |
| 107 | elements of the array they are in. |
| 108 | |
| 109 | The algorithms used are the same as in the old scheme. Other than the |
| 110 | "array-ness" of the whole thing, the functionality is identical to the |
| 111 | old scheme. |
| 112 | |
| 113 | gas_cgen_initialize_saved_fixups_array(): |
| 114 | Sets num_fixups_in_chain to 0 for each element. Call this from |
| 115 | md_begin() if you plan to use these functions and you want the |
| 116 | fixup count in each element to be set to 0 initially. This is |
| 117 | not necessary, but it's included just in case. It performs |
| 118 | the same function for each element in the array of fixup chains |
| 119 | that gas_init_parse() performs for the current fixups. |
| 120 | |
| 121 | gas_cgen_save_fixups (element): |
| 122 | element - element number of the array you wish to store the fixups |
| 123 | to. No mechanism is built in for tracking what element |
| 124 | was last stored to. |
| 125 | |
| 126 | gas_cgen_restore_fixups (element): |
| 127 | element - element number of the array you wish to restore the fixups |
| 128 | from. |
| 129 | |
| 130 | gas_cgen_swap_fixups(int element): |
| 131 | element - swap the current fixups with those in this element number. |
| 132 | */ |
| 133 | |
| 134 | struct saved_fixups |
| 135 | { |
| 136 | struct fixup fixup_chain[GAS_CGEN_MAX_FIXUPS]; |
| 137 | int num_fixups_in_chain; |
| 138 | }; |
| 139 | |
| 140 | static struct saved_fixups stored_fixups[MAX_SAVED_FIXUP_CHAINS]; |
| 141 | |
| 142 | void |
| 143 | gas_cgen_initialize_saved_fixups_array () |
| 144 | { |
| 145 | int i = 0; |
| 146 | |
| 147 | while (i < MAX_SAVED_FIXUP_CHAINS) |
| 148 | stored_fixups[i++].num_fixups_in_chain = 0; |
| 149 | } |
| 150 | |
| 151 | void |
| 152 | gas_cgen_save_fixups (i) |
| 153 | int i; |
| 154 | { |
| 155 | if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS) |
| 156 | { |
| 157 | as_fatal ("index into stored_fixups[] out of bounds"); |
| 158 | return; |
| 159 | } |
| 160 | |
| 161 | stored_fixups[i].num_fixups_in_chain = num_fixups; |
| 162 | memcpy (stored_fixups[i].fixup_chain, fixups, |
| 163 | sizeof (fixups[0]) * num_fixups); |
| 164 | num_fixups = 0; |
| 165 | } |
| 166 | |
| 167 | void |
| 168 | gas_cgen_restore_fixups (i) |
| 169 | int i; |
| 170 | { |
| 171 | if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS) |
| 172 | { |
| 173 | as_fatal ("index into stored_fixups[] out of bounds"); |
| 174 | return; |
| 175 | } |
| 176 | |
| 177 | num_fixups = stored_fixups[i].num_fixups_in_chain; |
| 178 | memcpy (fixups, stored_fixups[i].fixup_chain, |
| 179 | (sizeof (stored_fixups[i].fixup_chain[0])) * num_fixups); |
| 180 | stored_fixups[i].num_fixups_in_chain = 0; |
| 181 | } |
| 182 | |
| 183 | void |
| 184 | gas_cgen_swap_fixups (i) |
| 185 | int i; |
| 186 | { |
| 187 | if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS) |
| 188 | { |
| 189 | as_fatal ("index into stored_fixups[] out of bounds"); |
| 190 | return; |
| 191 | } |
| 192 | |
| 193 | if (num_fixups == 0) |
| 194 | gas_cgen_restore_fixups (i); |
| 195 | |
| 196 | else if (stored_fixups[i].num_fixups_in_chain == 0) |
| 197 | gas_cgen_save_fixups (i); |
| 198 | |
| 199 | else |
| 200 | { |
| 201 | int tmp; |
| 202 | struct fixup tmp_fixup; |
| 203 | |
| 204 | tmp = stored_fixups[i].num_fixups_in_chain; |
| 205 | stored_fixups[i].num_fixups_in_chain = num_fixups; |
| 206 | num_fixups = tmp; |
| 207 | |
| 208 | for (tmp = GAS_CGEN_MAX_FIXUPS; tmp--;) |
| 209 | { |
| 210 | tmp_fixup = stored_fixups[i].fixup_chain [tmp]; |
| 211 | stored_fixups[i].fixup_chain[tmp] = fixups [tmp]; |
| 212 | fixups [tmp] = tmp_fixup; |
| 213 | } |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | /* Default routine to record a fixup. |
| 218 | This is a cover function to fix_new. |
| 219 | It exists because we record INSN with the fixup. |
| 220 | |
| 221 | FRAG and WHERE are their respective arguments to fix_new_exp. |
| 222 | LENGTH is in bits. |
| 223 | OPINFO is something the caller chooses to help in reloc determination. |
| 224 | |
| 225 | At this point we do not use a bfd_reloc_code_real_type for |
| 226 | operands residing in the insn, but instead just use the |
| 227 | operand index. This lets us easily handle fixups for any |
| 228 | operand type. We pick a BFD reloc type in md_apply_fix. */ |
| 229 | |
| 230 | fixS * |
| 231 | gas_cgen_record_fixup (frag, where, insn, length, operand, opinfo, symbol, offset) |
| 232 | fragS * frag; |
| 233 | int where; |
| 234 | const CGEN_INSN * insn; |
| 235 | int length; |
| 236 | const CGEN_OPERAND * operand; |
| 237 | int opinfo; |
| 238 | symbolS * symbol; |
| 239 | offsetT offset; |
| 240 | { |
| 241 | fixS *fixP; |
| 242 | |
| 243 | /* It may seem strange to use operand->attrs and not insn->attrs here, |
| 244 | but it is the operand that has a pc relative relocation. */ |
| 245 | fixP = fix_new (frag, where, length / 8, symbol, offset, |
| 246 | CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_PCREL_ADDR), |
| 247 | (bfd_reloc_code_real_type) |
| 248 | ((int) BFD_RELOC_UNUSED |
| 249 | + (int) operand->type)); |
| 250 | fixP->fx_cgen.insn = insn; |
| 251 | fixP->fx_cgen.opinfo = opinfo; |
| 252 | |
| 253 | return fixP; |
| 254 | } |
| 255 | |
| 256 | /* Default routine to record a fixup given an expression. |
| 257 | This is a cover function to fix_new_exp. |
| 258 | It exists because we record INSN with the fixup. |
| 259 | |
| 260 | FRAG and WHERE are their respective arguments to fix_new_exp. |
| 261 | LENGTH is in bits. |
| 262 | OPINFO is something the caller chooses to help in reloc determination. |
| 263 | |
| 264 | At this point we do not use a bfd_reloc_code_real_type for |
| 265 | operands residing in the insn, but instead just use the |
| 266 | operand index. This lets us easily handle fixups for any |
| 267 | operand type. We pick a BFD reloc type in md_apply_fix. */ |
| 268 | |
| 269 | fixS * |
| 270 | gas_cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp) |
| 271 | fragS * frag; |
| 272 | int where; |
| 273 | const CGEN_INSN * insn; |
| 274 | int length; |
| 275 | const CGEN_OPERAND * operand; |
| 276 | int opinfo; |
| 277 | expressionS * exp; |
| 278 | { |
| 279 | fixS *fixP; |
| 280 | |
| 281 | /* It may seem strange to use operand->attrs and not insn->attrs here, |
| 282 | but it is the operand that has a pc relative relocation. */ |
| 283 | fixP = fix_new_exp (frag, where, length / 8, exp, |
| 284 | CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_PCREL_ADDR), |
| 285 | (bfd_reloc_code_real_type) |
| 286 | ((int) BFD_RELOC_UNUSED |
| 287 | + (int) operand->type)); |
| 288 | fixP->fx_cgen.insn = insn; |
| 289 | fixP->fx_cgen.opinfo = opinfo; |
| 290 | |
| 291 | return fixP; |
| 292 | } |
| 293 | |
| 294 | /* Used for communication between the next two procedures. */ |
| 295 | static jmp_buf expr_jmp_buf; |
| 296 | static int expr_jmp_buf_p; |
| 297 | |
| 298 | /* Callback for cgen interface. Parse the expression at *STRP. |
| 299 | The result is an error message or NULL for success (in which case |
| 300 | *STRP is advanced past the parsed text). |
| 301 | WANT is an indication of what the caller is looking for. |
| 302 | If WANT == CGEN_ASM_PARSE_INIT the caller is beginning to try to match |
| 303 | a table entry with the insn, reset the queued fixups counter. |
| 304 | An enum cgen_parse_operand_result is stored in RESULTP. |
| 305 | OPINDEX is the operand's table entry index. |
| 306 | OPINFO is something the caller chooses to help in reloc determination. |
| 307 | The resulting value is stored in VALUEP. */ |
| 308 | |
| 309 | const char * |
| 310 | gas_cgen_parse_operand (cd, want, strP, opindex, opinfo, resultP, valueP) |
| 311 | CGEN_CPU_DESC cd ATTRIBUTE_UNUSED; |
| 312 | enum cgen_parse_operand_type want; |
| 313 | const char **strP; |
| 314 | int opindex; |
| 315 | int opinfo; |
| 316 | enum cgen_parse_operand_result *resultP; |
| 317 | bfd_vma *valueP; |
| 318 | { |
| 319 | #ifdef __STDC__ |
| 320 | /* These are volatile to survive the setjmp. */ |
| 321 | char * volatile hold; |
| 322 | enum cgen_parse_operand_result * volatile resultP_1; |
| 323 | volatile int opinfo_1; |
| 324 | #else |
| 325 | static char *hold; |
| 326 | static enum cgen_parse_operand_result *resultP_1; |
| 327 | int opinfo_1; |
| 328 | #endif |
| 329 | const char *errmsg; |
| 330 | expressionS exp; |
| 331 | |
| 332 | if (want == CGEN_PARSE_OPERAND_INIT) |
| 333 | { |
| 334 | gas_cgen_init_parse (); |
| 335 | return NULL; |
| 336 | } |
| 337 | |
| 338 | resultP_1 = resultP; |
| 339 | hold = input_line_pointer; |
| 340 | input_line_pointer = (char *) *strP; |
| 341 | opinfo_1 = opinfo; |
| 342 | |
| 343 | /* We rely on md_operand to longjmp back to us. |
| 344 | This is done via gas_cgen_md_operand. */ |
| 345 | if (setjmp (expr_jmp_buf) != 0) |
| 346 | { |
| 347 | expr_jmp_buf_p = 0; |
| 348 | input_line_pointer = (char *) hold; |
| 349 | *resultP_1 = CGEN_PARSE_OPERAND_RESULT_ERROR; |
| 350 | return _("illegal operand"); |
| 351 | } |
| 352 | |
| 353 | expr_jmp_buf_p = 1; |
| 354 | expression (&exp); |
| 355 | expr_jmp_buf_p = 0; |
| 356 | errmsg = NULL; |
| 357 | |
| 358 | *strP = input_line_pointer; |
| 359 | input_line_pointer = hold; |
| 360 | |
| 361 | #ifdef TC_CGEN_PARSE_FIX_EXP |
| 362 | opinfo_1 = TC_CGEN_PARSE_FIX_EXP (opinfo_1, & exp); |
| 363 | #endif |
| 364 | |
| 365 | /* FIXME: Need to check `want'. */ |
| 366 | |
| 367 | switch (exp.X_op) |
| 368 | { |
| 369 | case O_illegal: |
| 370 | errmsg = _("illegal operand"); |
| 371 | *resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; |
| 372 | break; |
| 373 | case O_absent: |
| 374 | errmsg = _("missing operand"); |
| 375 | *resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; |
| 376 | break; |
| 377 | case O_constant: |
| 378 | if (want == CGEN_PARSE_OPERAND_SYMBOLIC) |
| 379 | goto de_fault; |
| 380 | *valueP = exp.X_add_number; |
| 381 | *resultP = CGEN_PARSE_OPERAND_RESULT_NUMBER; |
| 382 | break; |
| 383 | case O_register: |
| 384 | *valueP = exp.X_add_number; |
| 385 | *resultP = CGEN_PARSE_OPERAND_RESULT_REGISTER; |
| 386 | break; |
| 387 | de_fault: |
| 388 | default: |
| 389 | queue_fixup (opindex, opinfo_1, &exp); |
| 390 | *valueP = 0; |
| 391 | *resultP = CGEN_PARSE_OPERAND_RESULT_QUEUED; |
| 392 | break; |
| 393 | } |
| 394 | |
| 395 | return errmsg; |
| 396 | } |
| 397 | |
| 398 | /* md_operand handler to catch unrecognized expressions and halt the |
| 399 | parsing process so the next entry can be tried. |
| 400 | |
| 401 | ??? This could be done differently by adding code to `expression'. */ |
| 402 | |
| 403 | void |
| 404 | gas_cgen_md_operand (expressionP) |
| 405 | expressionS *expressionP ATTRIBUTE_UNUSED; |
| 406 | { |
| 407 | /* Don't longjmp if we're not called from within cgen_parse_operand(). */ |
| 408 | if (expr_jmp_buf_p) |
| 409 | longjmp (expr_jmp_buf, 1); |
| 410 | } |
| 411 | |
| 412 | /* Finish assembling instruction INSN. |
| 413 | BUF contains what we've built up so far. |
| 414 | LENGTH is the size of the insn in bits. |
| 415 | RELAX_P is non-zero if relaxable insns should be emitted as such. |
| 416 | Otherwise they're emitted in non-relaxable forms. |
| 417 | The "result" is stored in RESULT if non-NULL. */ |
| 418 | |
| 419 | void |
| 420 | gas_cgen_finish_insn (insn, buf, length, relax_p, result) |
| 421 | const CGEN_INSN *insn; |
| 422 | CGEN_INSN_BYTES_PTR buf; |
| 423 | unsigned int length; |
| 424 | int relax_p; |
| 425 | finished_insnS *result; |
| 426 | { |
| 427 | int i; |
| 428 | int relax_operand; |
| 429 | char *f; |
| 430 | unsigned int byte_len = length / 8; |
| 431 | |
| 432 | /* ??? Target foo issues various warnings here, so one might want to provide |
| 433 | a hook here. However, our caller is defined in tc-foo.c so there |
| 434 | shouldn't be a need for a hook. */ |
| 435 | |
| 436 | /* Write out the instruction. |
| 437 | It is important to fetch enough space in one call to `frag_more'. |
| 438 | We use (f - frag_now->fr_literal) to compute where we are and we |
| 439 | don't want frag_now to change between calls. |
| 440 | |
| 441 | Relaxable instructions: We need to ensure we allocate enough |
| 442 | space for the largest insn. */ |
| 443 | |
| 444 | if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED)) |
| 445 | /* These currently shouldn't get here. */ |
| 446 | abort (); |
| 447 | |
| 448 | /* Is there a relaxable insn with the relaxable operand needing a fixup? */ |
| 449 | |
| 450 | relax_operand = -1; |
| 451 | if (relax_p && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXABLE)) |
| 452 | { |
| 453 | /* Scan the fixups for the operand affected by relaxing |
| 454 | (i.e. the branch address). */ |
| 455 | |
| 456 | for (i = 0; i < num_fixups; ++i) |
| 457 | { |
| 458 | if (CGEN_OPERAND_ATTR_VALUE (cgen_operand_lookup_by_num (gas_cgen_cpu_desc, fixups[i].opindex), |
| 459 | CGEN_OPERAND_RELAX)) |
| 460 | { |
| 461 | relax_operand = i; |
| 462 | break; |
| 463 | } |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | if (relax_operand != -1) |
| 468 | { |
| 469 | int max_len; |
| 470 | fragS *old_frag; |
| 471 | expressionS *exp; |
| 472 | symbolS *sym; |
| 473 | offsetT off; |
| 474 | |
| 475 | #ifdef TC_CGEN_MAX_RELAX |
| 476 | max_len = TC_CGEN_MAX_RELAX (insn, byte_len); |
| 477 | #else |
| 478 | max_len = CGEN_MAX_INSN_SIZE; |
| 479 | #endif |
| 480 | /* Ensure variable part and fixed part are in same fragment. */ |
| 481 | /* FIXME: Having to do this seems like a hack. */ |
| 482 | frag_grow (max_len); |
| 483 | |
| 484 | /* Allocate space for the fixed part. */ |
| 485 | f = frag_more (byte_len); |
| 486 | |
| 487 | /* Create a relaxable fragment for this instruction. */ |
| 488 | old_frag = frag_now; |
| 489 | |
| 490 | exp = &fixups[relax_operand].exp; |
| 491 | sym = exp->X_add_symbol; |
| 492 | off = exp->X_add_number; |
| 493 | if (exp->X_op != O_constant && exp->X_op != O_symbol) |
| 494 | { |
| 495 | /* Handle complex expressions. */ |
| 496 | sym = make_expr_symbol (exp); |
| 497 | off = 0; |
| 498 | } |
| 499 | |
| 500 | frag_var (rs_machine_dependent, |
| 501 | max_len - byte_len /* max chars */, |
| 502 | 0 /* variable part already allocated */, |
| 503 | /* FIXME: When we machine generate the relax table, |
| 504 | machine generate a macro to compute subtype. */ |
| 505 | 1 /* subtype */, |
| 506 | sym, |
| 507 | off, |
| 508 | f); |
| 509 | |
| 510 | /* Record the operand number with the fragment so md_convert_frag |
| 511 | can use gas_cgen_md_record_fixup to record the appropriate reloc. */ |
| 512 | old_frag->fr_cgen.insn = insn; |
| 513 | old_frag->fr_cgen.opindex = fixups[relax_operand].opindex; |
| 514 | old_frag->fr_cgen.opinfo = fixups[relax_operand].opinfo; |
| 515 | if (result) |
| 516 | result->frag = old_frag; |
| 517 | } |
| 518 | else |
| 519 | { |
| 520 | f = frag_more (byte_len); |
| 521 | if (result) |
| 522 | result->frag = frag_now; |
| 523 | } |
| 524 | |
| 525 | /* If we're recording insns as numbers (rather than a string of bytes), |
| 526 | target byte order handling is deferred until now. */ |
| 527 | #if CGEN_INT_INSN_P |
| 528 | cgen_put_insn_value (gas_cgen_cpu_desc, (unsigned char *) f, length, *buf); |
| 529 | #else |
| 530 | memcpy (f, buf, byte_len); |
| 531 | #endif |
| 532 | |
| 533 | /* Emit DWARF2 debugging information. */ |
| 534 | dwarf2_emit_insn (byte_len); |
| 535 | |
| 536 | /* Create any fixups. */ |
| 537 | for (i = 0; i < num_fixups; ++i) |
| 538 | { |
| 539 | fixS *fixP; |
| 540 | const CGEN_OPERAND *operand = |
| 541 | cgen_operand_lookup_by_num (gas_cgen_cpu_desc, fixups[i].opindex); |
| 542 | |
| 543 | /* Don't create fixups for these. That's done during relaxation. |
| 544 | We don't need to test for CGEN_INSN_RELAXED as they can't get here |
| 545 | (see above). */ |
| 546 | if (relax_p |
| 547 | && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXABLE) |
| 548 | && CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_RELAX)) |
| 549 | continue; |
| 550 | |
| 551 | #ifndef md_cgen_record_fixup_exp |
| 552 | #define md_cgen_record_fixup_exp gas_cgen_record_fixup_exp |
| 553 | #endif |
| 554 | |
| 555 | fixP = md_cgen_record_fixup_exp (frag_now, f - frag_now->fr_literal, |
| 556 | insn, length, operand, |
| 557 | fixups[i].opinfo, |
| 558 | &fixups[i].exp); |
| 559 | if (result) |
| 560 | result->fixups[i] = fixP; |
| 561 | } |
| 562 | |
| 563 | if (result) |
| 564 | { |
| 565 | result->num_fixups = num_fixups; |
| 566 | result->addr = f; |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | /* Apply a fixup to the object code. This is called for all the |
| 571 | fixups we generated by the call to fix_new_exp, above. In the call |
| 572 | above we used a reloc code which was the largest legal reloc code |
| 573 | plus the operand index. Here we undo that to recover the operand |
| 574 | index. At this point all symbol values should be fully resolved, |
| 575 | and we attempt to completely resolve the reloc. If we can not do |
| 576 | that, we determine the correct reloc code and put it back in the fixup. */ |
| 577 | |
| 578 | /* FIXME: This function handles some of the fixups and bfd_install_relocation |
| 579 | handles the rest. bfd_install_relocation (or some other bfd function) |
| 580 | should handle them all. */ |
| 581 | |
| 582 | void |
| 583 | gas_cgen_md_apply_fix (fixP, valP, seg) |
| 584 | fixS * fixP; |
| 585 | valueT * valP; |
| 586 | segT seg ATTRIBUTE_UNUSED; |
| 587 | { |
| 588 | char *where = fixP->fx_frag->fr_literal + fixP->fx_where; |
| 589 | valueT value = * valP; |
| 590 | /* Canonical name, since used a lot. */ |
| 591 | CGEN_CPU_DESC cd = gas_cgen_cpu_desc; |
| 592 | |
| 593 | if (fixP->fx_addsy == (symbolS *) NULL) |
| 594 | fixP->fx_done = 1; |
| 595 | |
| 596 | /* We don't actually support subtracting a symbol. */ |
| 597 | if (fixP->fx_subsy != (symbolS *) NULL) |
| 598 | as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex")); |
| 599 | |
| 600 | if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED) |
| 601 | { |
| 602 | int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED; |
| 603 | const CGEN_OPERAND *operand = cgen_operand_lookup_by_num (cd, opindex); |
| 604 | const char *errmsg; |
| 605 | bfd_reloc_code_real_type reloc_type; |
| 606 | CGEN_FIELDS *fields = alloca (CGEN_CPU_SIZEOF_FIELDS (cd)); |
| 607 | const CGEN_INSN *insn = fixP->fx_cgen.insn; |
| 608 | |
| 609 | /* If the reloc has been fully resolved finish the operand here. */ |
| 610 | /* FIXME: This duplicates the capabilities of code in BFD. */ |
| 611 | if (fixP->fx_done |
| 612 | /* FIXME: If partial_inplace isn't set bfd_install_relocation won't |
| 613 | finish the job. Testing for pcrel is a temporary hack. */ |
| 614 | || fixP->fx_pcrel) |
| 615 | { |
| 616 | CGEN_CPU_SET_FIELDS_BITSIZE (cd) (fields, CGEN_INSN_BITSIZE (insn)); |
| 617 | CGEN_CPU_SET_VMA_OPERAND (cd) (cd, opindex, fields, (bfd_vma) value); |
| 618 | |
| 619 | #if CGEN_INT_INSN_P |
| 620 | { |
| 621 | CGEN_INSN_INT insn_value = |
| 622 | cgen_get_insn_value (cd, (unsigned char *) where, |
| 623 | CGEN_INSN_BITSIZE (insn)); |
| 624 | |
| 625 | /* ??? 0 is passed for `pc'. */ |
| 626 | errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, |
| 627 | &insn_value, (bfd_vma) 0); |
| 628 | cgen_put_insn_value (cd, (unsigned char *) where, |
| 629 | CGEN_INSN_BITSIZE (insn), insn_value); |
| 630 | } |
| 631 | #else |
| 632 | /* ??? 0 is passed for `pc'. */ |
| 633 | errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, |
| 634 | (unsigned char *) where, |
| 635 | (bfd_vma) 0); |
| 636 | #endif |
| 637 | if (errmsg) |
| 638 | as_bad_where (fixP->fx_file, fixP->fx_line, "%s", errmsg); |
| 639 | } |
| 640 | |
| 641 | if (fixP->fx_done) |
| 642 | return; |
| 643 | |
| 644 | /* The operand isn't fully resolved. Determine a BFD reloc value |
| 645 | based on the operand information and leave it to |
| 646 | bfd_install_relocation. Note that this doesn't work when |
| 647 | partial_inplace == false. */ |
| 648 | |
| 649 | reloc_type = md_cgen_lookup_reloc (insn, operand, fixP); |
| 650 | |
| 651 | if (reloc_type != BFD_RELOC_NONE) |
| 652 | fixP->fx_r_type = reloc_type; |
| 653 | else |
| 654 | { |
| 655 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 656 | _("unresolved expression that must be resolved")); |
| 657 | fixP->fx_done = 1; |
| 658 | return; |
| 659 | } |
| 660 | } |
| 661 | else if (fixP->fx_done) |
| 662 | { |
| 663 | /* We're finished with this fixup. Install it because |
| 664 | bfd_install_relocation won't be called to do it. */ |
| 665 | switch (fixP->fx_r_type) |
| 666 | { |
| 667 | case BFD_RELOC_8: |
| 668 | md_number_to_chars (where, value, 1); |
| 669 | break; |
| 670 | case BFD_RELOC_16: |
| 671 | md_number_to_chars (where, value, 2); |
| 672 | break; |
| 673 | case BFD_RELOC_32: |
| 674 | md_number_to_chars (where, value, 4); |
| 675 | break; |
| 676 | case BFD_RELOC_64: |
| 677 | md_number_to_chars (where, value, 8); |
| 678 | break; |
| 679 | default: |
| 680 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 681 | _("internal error: can't install fix for reloc type %d (`%s')"), |
| 682 | fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type)); |
| 683 | break; |
| 684 | } |
| 685 | } |
| 686 | /* else |
| 687 | bfd_install_relocation will be called to finish things up. */ |
| 688 | |
| 689 | /* Tuck `value' away for use by tc_gen_reloc. |
| 690 | See the comment describing fx_addnumber in write.h. |
| 691 | This field is misnamed (or misused :-). */ |
| 692 | fixP->fx_addnumber = value; |
| 693 | } |
| 694 | |
| 695 | /* Translate internal representation of relocation info to BFD target format. |
| 696 | |
| 697 | FIXME: To what extent can we get all relevant targets to use this? */ |
| 698 | |
| 699 | arelent * |
| 700 | gas_cgen_tc_gen_reloc (section, fixP) |
| 701 | asection * section ATTRIBUTE_UNUSED; |
| 702 | fixS * fixP; |
| 703 | { |
| 704 | arelent *reloc; |
| 705 | |
| 706 | reloc = (arelent *) xmalloc (sizeof (arelent)); |
| 707 | |
| 708 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); |
| 709 | if (reloc->howto == (reloc_howto_type *) NULL) |
| 710 | { |
| 711 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 712 | _("relocation is not supported")); |
| 713 | return NULL; |
| 714 | } |
| 715 | |
| 716 | assert (!fixP->fx_pcrel == !reloc->howto->pc_relative); |
| 717 | |
| 718 | reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); |
| 719 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); |
| 720 | |
| 721 | /* Use fx_offset for these cases. */ |
| 722 | if (fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY |
| 723 | || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT) |
| 724 | reloc->addend = fixP->fx_offset; |
| 725 | else |
| 726 | reloc->addend = fixP->fx_addnumber; |
| 727 | |
| 728 | reloc->address = fixP->fx_frag->fr_address + fixP->fx_where; |
| 729 | return reloc; |
| 730 | } |
| 731 | |
| 732 | /* Perform any cgen specific initialisation. |
| 733 | Called after gas_cgen_cpu_desc has been created. */ |
| 734 | |
| 735 | void |
| 736 | gas_cgen_begin () |
| 737 | { |
| 738 | if (flag_signed_overflow_ok) |
| 739 | cgen_set_signed_overflow_ok (gas_cgen_cpu_desc); |
| 740 | else |
| 741 | cgen_clear_signed_overflow_ok (gas_cgen_cpu_desc); |
| 742 | } |