| 1 | /* GAS interface for targets using CGEN: Cpu tools GENerator. |
| 2 | Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GAS, the GNU Assembler. |
| 5 | |
| 6 | GAS is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GAS is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GAS; see the file COPYING. If not, write to the Free Software |
| 18 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | #include <setjmp.h> |
| 21 | #include "ansidecl.h" |
| 22 | #include "bfd.h" |
| 23 | #include "symcat.h" |
| 24 | #include "cgen-opc.h" |
| 25 | #include "as.h" |
| 26 | #include "subsegs.h" |
| 27 | #include "cgen.h" |
| 28 | |
| 29 | /* Callback to insert a register into the symbol table. |
| 30 | A target may choose to let GAS parse the registers. |
| 31 | ??? Not currently used. */ |
| 32 | |
| 33 | void |
| 34 | cgen_asm_record_register (name, number) |
| 35 | char * name; |
| 36 | int number; |
| 37 | { |
| 38 | /* Use symbol_create here instead of symbol_new so we don't try to |
| 39 | output registers into the object file's symbol table. */ |
| 40 | symbol_table_insert (symbol_create (name, reg_section, |
| 41 | number, & zero_address_frag)); |
| 42 | } |
| 43 | |
| 44 | /* We need to keep a list of fixups. We can't simply generate them as |
| 45 | we go, because that would require us to first create the frag, and |
| 46 | that would screw up references to ``.''. |
| 47 | |
| 48 | This is used by cpu's with simple operands. It keeps knowledge of what |
| 49 | an `expressionS' is and what a `fixup' is out of CGEN which for the time |
| 50 | being is preferable. |
| 51 | |
| 52 | OPINDEX is the index in the operand table. |
| 53 | OPINFO is something the caller chooses to help in reloc determination. */ |
| 54 | |
| 55 | struct fixup |
| 56 | { |
| 57 | int opindex; |
| 58 | int opinfo; |
| 59 | expressionS exp; |
| 60 | }; |
| 61 | |
| 62 | static struct fixup fixups [CGEN_MAX_FIXUPS]; |
| 63 | static int num_fixups; |
| 64 | |
| 65 | /* Prepare to parse an instruction. |
| 66 | ??? May wish to make this static and delete calls in md_assemble. */ |
| 67 | |
| 68 | void |
| 69 | cgen_asm_init_parse () |
| 70 | { |
| 71 | num_fixups = 0; |
| 72 | } |
| 73 | |
| 74 | /* Queue a fixup. */ |
| 75 | |
| 76 | static void |
| 77 | cgen_queue_fixup (opindex, opinfo, expP) |
| 78 | int opindex; |
| 79 | expressionS * expP; |
| 80 | { |
| 81 | /* We need to generate a fixup for this expression. */ |
| 82 | if (num_fixups >= CGEN_MAX_FIXUPS) |
| 83 | as_fatal (_("too many fixups")); |
| 84 | fixups[num_fixups].exp = * expP; |
| 85 | fixups[num_fixups].opindex = opindex; |
| 86 | fixups[num_fixups].opinfo = opinfo; |
| 87 | ++ num_fixups; |
| 88 | } |
| 89 | |
| 90 | /* The following three functions allow a backup of the fixup chain to be made, |
| 91 | and to have this backup be swapped with the current chain. This allows |
| 92 | certain ports, eg the m32r, to swap two instructions and swap their fixups |
| 93 | at the same time. */ |
| 94 | static struct fixup saved_fixups [CGEN_MAX_FIXUPS]; |
| 95 | static int saved_num_fixups; |
| 96 | |
| 97 | void |
| 98 | cgen_save_fixups () |
| 99 | { |
| 100 | saved_num_fixups = num_fixups; |
| 101 | |
| 102 | memcpy (saved_fixups, fixups, sizeof (fixups[0]) * num_fixups); |
| 103 | |
| 104 | num_fixups = 0; |
| 105 | } |
| 106 | |
| 107 | void |
| 108 | cgen_restore_fixups () |
| 109 | { |
| 110 | num_fixups = saved_num_fixups; |
| 111 | |
| 112 | memcpy (fixups, saved_fixups, sizeof (fixups[0]) * num_fixups); |
| 113 | |
| 114 | saved_num_fixups = 0; |
| 115 | } |
| 116 | |
| 117 | void |
| 118 | cgen_swap_fixups () |
| 119 | { |
| 120 | int tmp; |
| 121 | struct fixup tmp_fixup; |
| 122 | |
| 123 | if (num_fixups == 0) |
| 124 | { |
| 125 | cgen_restore_fixups (); |
| 126 | } |
| 127 | else if (saved_num_fixups == 0) |
| 128 | { |
| 129 | cgen_save_fixups (); |
| 130 | } |
| 131 | else |
| 132 | { |
| 133 | tmp = saved_num_fixups; |
| 134 | saved_num_fixups = num_fixups; |
| 135 | num_fixups = tmp; |
| 136 | |
| 137 | for (tmp = CGEN_MAX_FIXUPS; tmp--;) |
| 138 | { |
| 139 | tmp_fixup = saved_fixups [tmp]; |
| 140 | saved_fixups [tmp] = fixups [tmp]; |
| 141 | fixups [tmp] = tmp_fixup; |
| 142 | } |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | /* Default routine to record a fixup. |
| 147 | This is a cover function to fix_new. |
| 148 | It exists because we record INSN with the fixup. |
| 149 | |
| 150 | FRAG and WHERE are their respective arguments to fix_new_exp. |
| 151 | LENGTH is in bits. |
| 152 | OPINFO is something the caller chooses to help in reloc determination. |
| 153 | |
| 154 | At this point we do not use a bfd_reloc_code_real_type for |
| 155 | operands residing in the insn, but instead just use the |
| 156 | operand index. This lets us easily handle fixups for any |
| 157 | operand type. We pick a BFD reloc type in md_apply_fix. */ |
| 158 | |
| 159 | fixS * |
| 160 | cgen_record_fixup (frag, where, insn, length, operand, opinfo, symbol, offset) |
| 161 | fragS * frag; |
| 162 | int where; |
| 163 | const CGEN_INSN * insn; |
| 164 | int length; |
| 165 | const CGEN_OPERAND * operand; |
| 166 | int opinfo; |
| 167 | symbolS * symbol; |
| 168 | offsetT offset; |
| 169 | { |
| 170 | fixS * fixP; |
| 171 | |
| 172 | /* It may seem strange to use operand->attrs and not insn->attrs here, |
| 173 | but it is the operand that has a pc relative relocation. */ |
| 174 | |
| 175 | fixP = fix_new (frag, where, length / 8, symbol, offset, |
| 176 | CGEN_OPERAND_ATTR (operand, CGEN_OPERAND_PCREL_ADDR) != 0, |
| 177 | (bfd_reloc_code_real_type) ((int) BFD_RELOC_UNUSED + CGEN_OPERAND_INDEX (operand))); |
| 178 | fixP->tc_fix_data.insn = (PTR) insn; |
| 179 | fixP->tc_fix_data.opinfo = opinfo; |
| 180 | |
| 181 | return fixP; |
| 182 | } |
| 183 | |
| 184 | /* Default routine to record a fixup given an expression. |
| 185 | This is a cover function to fix_new_exp. |
| 186 | It exists because we record INSN with the fixup. |
| 187 | |
| 188 | FRAG and WHERE are their respective arguments to fix_new_exp. |
| 189 | LENGTH is in bits. |
| 190 | OPINFO is something the caller chooses to help in reloc determination. |
| 191 | |
| 192 | At this point we do not use a bfd_reloc_code_real_type for |
| 193 | operands residing in the insn, but instead just use the |
| 194 | operand index. This lets us easily handle fixups for any |
| 195 | operand type. We pick a BFD reloc type in md_apply_fix. */ |
| 196 | |
| 197 | fixS * |
| 198 | cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp) |
| 199 | fragS * frag; |
| 200 | int where; |
| 201 | const CGEN_INSN * insn; |
| 202 | int length; |
| 203 | const CGEN_OPERAND * operand; |
| 204 | int opinfo; |
| 205 | expressionS * exp; |
| 206 | { |
| 207 | fixS * fixP; |
| 208 | |
| 209 | /* It may seem strange to use operand->attrs and not insn->attrs here, |
| 210 | but it is the operand that has a pc relative relocation. */ |
| 211 | |
| 212 | fixP = fix_new_exp (frag, where, length / 8, exp, |
| 213 | CGEN_OPERAND_ATTR (operand, CGEN_OPERAND_PCREL_ADDR) != 0, |
| 214 | (bfd_reloc_code_real_type) ((int) BFD_RELOC_UNUSED + CGEN_OPERAND_INDEX (operand))); |
| 215 | fixP->tc_fix_data.insn = (PTR) insn; |
| 216 | fixP->tc_fix_data.opinfo = opinfo; |
| 217 | |
| 218 | return fixP; |
| 219 | } |
| 220 | |
| 221 | /* Used for communication between the next two procedures. */ |
| 222 | static jmp_buf expr_jmp_buf; |
| 223 | |
| 224 | /* Callback for cgen interface. Parse the expression at *STRP. |
| 225 | The result is an error message or NULL for success (in which case |
| 226 | *STRP is advanced past the parsed text). |
| 227 | WANT is an indication of what the caller is looking for. |
| 228 | If WANT == CGEN_ASM_PARSE_INIT the caller is beginning to try to match |
| 229 | a table entry with the insn, reset the queued fixups counter. |
| 230 | An enum cgen_parse_operand_result is stored in RESULTP. |
| 231 | OPINDEX is the operand's table entry index. |
| 232 | OPINFO is something the caller chooses to help in reloc determination. |
| 233 | The resulting value is stored in VALUEP. */ |
| 234 | |
| 235 | const char * |
| 236 | cgen_parse_operand (want, strP, opindex, opinfo, resultP, valueP) |
| 237 | enum cgen_parse_operand_type want; |
| 238 | const char ** strP; |
| 239 | int opindex; |
| 240 | int opinfo; |
| 241 | enum cgen_parse_operand_result * resultP; |
| 242 | bfd_vma * valueP; |
| 243 | { |
| 244 | #ifdef __STDC__ |
| 245 | /* These are volatile to survive the setjmp. */ |
| 246 | char * volatile hold; |
| 247 | enum cgen_parse_operand_result * volatile resultP_1; |
| 248 | #else |
| 249 | static char * hold; |
| 250 | static enum cgen_parse_operand_result * resultP_1; |
| 251 | #endif |
| 252 | const char * errmsg = NULL; |
| 253 | expressionS exp; |
| 254 | |
| 255 | if (want == CGEN_PARSE_OPERAND_INIT) |
| 256 | { |
| 257 | cgen_asm_init_parse (); |
| 258 | return NULL; |
| 259 | } |
| 260 | |
| 261 | resultP_1 = resultP; |
| 262 | hold = input_line_pointer; |
| 263 | input_line_pointer = (char *) * strP; |
| 264 | |
| 265 | /* We rely on md_operand to longjmp back to us. |
| 266 | This is done via cgen_md_operand. */ |
| 267 | if (setjmp (expr_jmp_buf) != 0) |
| 268 | { |
| 269 | input_line_pointer = (char *) hold; |
| 270 | * resultP_1 = CGEN_PARSE_OPERAND_RESULT_ERROR; |
| 271 | return "illegal operand"; |
| 272 | } |
| 273 | |
| 274 | expression (& exp); |
| 275 | |
| 276 | * strP = input_line_pointer; |
| 277 | input_line_pointer = hold; |
| 278 | |
| 279 | /* FIXME: Need to check `want'. */ |
| 280 | |
| 281 | switch (exp.X_op) |
| 282 | { |
| 283 | case O_illegal : |
| 284 | errmsg = _("illegal operand"); |
| 285 | * resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; |
| 286 | break; |
| 287 | case O_absent : |
| 288 | errmsg = _("missing operand"); |
| 289 | * resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; |
| 290 | break; |
| 291 | case O_constant : |
| 292 | * valueP = exp.X_add_number; |
| 293 | * resultP = CGEN_PARSE_OPERAND_RESULT_NUMBER; |
| 294 | break; |
| 295 | case O_register : |
| 296 | * valueP = exp.X_add_number; |
| 297 | * resultP = CGEN_PARSE_OPERAND_RESULT_REGISTER; |
| 298 | break; |
| 299 | default : |
| 300 | cgen_queue_fixup (opindex, opinfo, & exp); |
| 301 | * valueP = 0; |
| 302 | * resultP = CGEN_PARSE_OPERAND_RESULT_QUEUED; |
| 303 | break; |
| 304 | } |
| 305 | |
| 306 | return errmsg; |
| 307 | } |
| 308 | |
| 309 | /* md_operand handler to catch unrecognized expressions and halt the |
| 310 | parsing process so the next entry can be tried. |
| 311 | |
| 312 | ??? This could be done differently by adding code to `expression'. */ |
| 313 | |
| 314 | void |
| 315 | cgen_md_operand (expressionP) |
| 316 | expressionS * expressionP; |
| 317 | { |
| 318 | longjmp (expr_jmp_buf, 1); |
| 319 | } |
| 320 | |
| 321 | /* Finish assembling instruction INSN. |
| 322 | BUF contains what we've built up so far. |
| 323 | LENGTH is the size of the insn in bits. |
| 324 | RELAX_P is non-zero if relaxable insns should be emitted as such. |
| 325 | Otherwise they're emitted in non-relaxable forms. |
| 326 | The "result" is stored in RESULT if non-NULL. */ |
| 327 | |
| 328 | void |
| 329 | cgen_asm_finish_insn (insn, buf, length, relax_p, result) |
| 330 | const CGEN_INSN * insn; |
| 331 | cgen_insn_t * buf; |
| 332 | unsigned int length; |
| 333 | int relax_p; |
| 334 | finished_insnS * result; |
| 335 | { |
| 336 | int i; |
| 337 | int relax_operand; |
| 338 | char * f; |
| 339 | unsigned int byte_len = length / 8; |
| 340 | |
| 341 | /* ??? Target foo issues various warnings here, so one might want to provide |
| 342 | a hook here. However, our caller is defined in tc-foo.c so there |
| 343 | shouldn't be a need for a hook. */ |
| 344 | |
| 345 | /* Write out the instruction. |
| 346 | It is important to fetch enough space in one call to `frag_more'. |
| 347 | We use (f - frag_now->fr_literal) to compute where we are and we |
| 348 | don't want frag_now to change between calls. |
| 349 | |
| 350 | Relaxable instructions: We need to ensure we allocate enough |
| 351 | space for the largest insn. */ |
| 352 | |
| 353 | if (CGEN_INSN_ATTR (insn, CGEN_INSN_RELAX) != 0) |
| 354 | abort (); /* These currently shouldn't get here. */ |
| 355 | |
| 356 | /* Is there a relaxable insn with the relaxable operand needing a fixup? */ |
| 357 | |
| 358 | relax_operand = -1; |
| 359 | if (relax_p && CGEN_INSN_ATTR (insn, CGEN_INSN_RELAXABLE) != 0) |
| 360 | { |
| 361 | /* Scan the fixups for the operand affected by relaxing |
| 362 | (i.e. the branch address). */ |
| 363 | |
| 364 | for (i = 0; i < num_fixups; ++ i) |
| 365 | { |
| 366 | if (CGEN_OPERAND_ATTR (& CGEN_SYM (operand_table) [fixups[i].opindex], |
| 367 | CGEN_OPERAND_RELAX) != 0) |
| 368 | { |
| 369 | relax_operand = i; |
| 370 | break; |
| 371 | } |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | if (relax_operand != -1) |
| 376 | { |
| 377 | int max_len; |
| 378 | fragS * old_frag; |
| 379 | |
| 380 | #ifdef TC_CGEN_MAX_RELAX |
| 381 | max_len = TC_CGEN_MAX_RELAX (insn, byte_len); |
| 382 | #else |
| 383 | max_len = CGEN_MAX_INSN_SIZE; |
| 384 | #endif |
| 385 | /* Ensure variable part and fixed part are in same fragment. */ |
| 386 | /* FIXME: Having to do this seems like a hack. */ |
| 387 | frag_grow (max_len); |
| 388 | |
| 389 | /* Allocate space for the fixed part. */ |
| 390 | f = frag_more (byte_len); |
| 391 | |
| 392 | /* Create a relaxable fragment for this instruction. */ |
| 393 | old_frag = frag_now; |
| 394 | |
| 395 | frag_var (rs_machine_dependent, |
| 396 | max_len - byte_len /* max chars */, |
| 397 | 0 /* variable part already allocated */, |
| 398 | /* FIXME: When we machine generate the relax table, |
| 399 | machine generate a macro to compute subtype. */ |
| 400 | 1 /* subtype */, |
| 401 | fixups[relax_operand].exp.X_add_symbol, |
| 402 | fixups[relax_operand].exp.X_add_number, |
| 403 | f); |
| 404 | |
| 405 | /* Record the operand number with the fragment so md_convert_frag |
| 406 | can use cgen_md_record_fixup to record the appropriate reloc. */ |
| 407 | old_frag->fr_cgen.insn = insn; |
| 408 | old_frag->fr_cgen.opindex = fixups[relax_operand].opindex; |
| 409 | old_frag->fr_cgen.opinfo = fixups[relax_operand].opinfo; |
| 410 | if (result) |
| 411 | result->frag = old_frag; |
| 412 | } |
| 413 | else |
| 414 | { |
| 415 | f = frag_more (byte_len); |
| 416 | if (result) |
| 417 | result->frag = frag_now; |
| 418 | } |
| 419 | |
| 420 | /* If we're recording insns as numbers (rather than a string of bytes), |
| 421 | target byte order handling is deferred until now. */ |
| 422 | #if 0 /*def CGEN_INT_INSN*/ |
| 423 | switch (length) |
| 424 | { |
| 425 | case 16: |
| 426 | if (cgen_big_endian_p) |
| 427 | bfd_putb16 ((bfd_vma) * buf, f); |
| 428 | else |
| 429 | bfd_putl16 ((bfd_vma) * buf, f); |
| 430 | break; |
| 431 | case 32: |
| 432 | if (cgen_big_endian_p) |
| 433 | bfd_putb32 ((bfd_vma) * buf, f); |
| 434 | else |
| 435 | bfd_putl32 ((bfd_vma) * buf, f); |
| 436 | break; |
| 437 | default: |
| 438 | abort (); |
| 439 | } |
| 440 | #else |
| 441 | memcpy (f, buf, byte_len); |
| 442 | #endif |
| 443 | |
| 444 | /* Create any fixups. */ |
| 445 | for (i = 0; i < num_fixups; ++i) |
| 446 | { |
| 447 | fixS * fixP; |
| 448 | |
| 449 | /* Don't create fixups for these. That's done during relaxation. |
| 450 | We don't need to test for CGEN_INSN_RELAX as they can't get here |
| 451 | (see above). */ |
| 452 | if (relax_p |
| 453 | && CGEN_INSN_ATTR (insn, CGEN_INSN_RELAXABLE) != 0 |
| 454 | && CGEN_OPERAND_ATTR (& CGEN_SYM (operand_table) [fixups[i].opindex], |
| 455 | CGEN_OPERAND_RELAX) != 0) |
| 456 | continue; |
| 457 | |
| 458 | #ifndef md_cgen_record_fixup_exp |
| 459 | #define md_cgen_record_fixup_exp cgen_record_fixup_exp |
| 460 | #endif |
| 461 | |
| 462 | fixP = md_cgen_record_fixup_exp (frag_now, f - frag_now->fr_literal, |
| 463 | insn, length, |
| 464 | & CGEN_SYM (operand_table) [fixups[i].opindex], |
| 465 | fixups[i].opinfo, |
| 466 | & fixups[i].exp); |
| 467 | if (result) |
| 468 | result->fixups[i] = fixP; |
| 469 | } |
| 470 | |
| 471 | if (result) |
| 472 | { |
| 473 | result->num_fixups = num_fixups; |
| 474 | result->addr = f; |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | /* Apply a fixup to the object code. This is called for all the |
| 479 | fixups we generated by the call to fix_new_exp, above. In the call |
| 480 | above we used a reloc code which was the largest legal reloc code |
| 481 | plus the operand index. Here we undo that to recover the operand |
| 482 | index. At this point all symbol values should be fully resolved, |
| 483 | and we attempt to completely resolve the reloc. If we can not do |
| 484 | that, we determine the correct reloc code and put it back in the fixup. */ |
| 485 | |
| 486 | /* FIXME: This function handles some of the fixups and bfd_install_relocation |
| 487 | handles the rest. bfd_install_relocation (or some other bfd function) |
| 488 | should handle them all. */ |
| 489 | |
| 490 | int |
| 491 | cgen_md_apply_fix3 (fixP, valueP, seg) |
| 492 | fixS * fixP; |
| 493 | valueT * valueP; |
| 494 | segT seg; |
| 495 | { |
| 496 | char * where = fixP->fx_frag->fr_literal + fixP->fx_where; |
| 497 | valueT value; |
| 498 | |
| 499 | /* FIXME FIXME FIXME: The value we are passed in *valuep includes |
| 500 | the symbol values. Since we are using BFD_ASSEMBLER, if we are |
| 501 | doing this relocation the code in write.c is going to call |
| 502 | bfd_install_relocation, which is also going to use the symbol |
| 503 | value. That means that if the reloc is fully resolved we want to |
| 504 | use *valuep since bfd_install_relocation is not being used. |
| 505 | However, if the reloc is not fully resolved we do not want to use |
| 506 | *valuep, and must use fx_offset instead. However, if the reloc |
| 507 | is PC relative, we do want to use *valuep since it includes the |
| 508 | result of md_pcrel_from. This is confusing. */ |
| 509 | |
| 510 | if (fixP->fx_addsy == (symbolS *) NULL) |
| 511 | { |
| 512 | value = * valueP; |
| 513 | fixP->fx_done = 1; |
| 514 | } |
| 515 | else if (fixP->fx_pcrel) |
| 516 | value = * valueP; |
| 517 | else |
| 518 | { |
| 519 | value = fixP->fx_offset; |
| 520 | if (fixP->fx_subsy != (symbolS *) NULL) |
| 521 | { |
| 522 | if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section) |
| 523 | value -= S_GET_VALUE (fixP->fx_subsy); |
| 524 | else |
| 525 | { |
| 526 | /* We don't actually support subtracting a symbol. */ |
| 527 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 528 | _("expression too complex")); |
| 529 | } |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED) |
| 534 | { |
| 535 | int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED; |
| 536 | const CGEN_OPERAND * operand = & CGEN_SYM (operand_table) [opindex]; |
| 537 | const char * errmsg; |
| 538 | bfd_reloc_code_real_type reloc_type; |
| 539 | CGEN_FIELDS fields; |
| 540 | const CGEN_INSN * insn = (CGEN_INSN *) fixP->tc_fix_data.insn; |
| 541 | |
| 542 | /* If the reloc has been fully resolved finish the operand here. */ |
| 543 | /* FIXME: This duplicates the capabilities of code in BFD. */ |
| 544 | if (fixP->fx_done |
| 545 | /* FIXME: If partial_inplace isn't set bfd_install_relocation won't |
| 546 | finish the job. Testing for pcrel is a temporary hack. */ |
| 547 | || fixP->fx_pcrel) |
| 548 | { |
| 549 | CGEN_FIELDS_BITSIZE (& fields) = CGEN_INSN_BITSIZE (insn); |
| 550 | CGEN_SYM (set_vma_operand) (opindex, & fields, (bfd_vma) value); |
| 551 | /* ??? 0 is passed for `pc' */ |
| 552 | errmsg = CGEN_SYM (insert_operand) (opindex, & fields, where, |
| 553 | (bfd_vma) 0); |
| 554 | if (errmsg) |
| 555 | as_warn_where (fixP->fx_file, fixP->fx_line, "%s", errmsg); |
| 556 | } |
| 557 | |
| 558 | if (fixP->fx_done) |
| 559 | return 1; |
| 560 | |
| 561 | /* The operand isn't fully resolved. Determine a BFD reloc value |
| 562 | based on the operand information and leave it to |
| 563 | bfd_install_relocation. Note that this doesn't work when |
| 564 | partial_inplace == false. */ |
| 565 | |
| 566 | reloc_type = CGEN_SYM (lookup_reloc) (insn, operand, fixP); |
| 567 | if (reloc_type != BFD_RELOC_NONE) |
| 568 | { |
| 569 | fixP->fx_r_type = reloc_type; |
| 570 | } |
| 571 | else |
| 572 | { |
| 573 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 574 | _("unresolved expression that must be resolved")); |
| 575 | fixP->fx_done = 1; |
| 576 | return 1; |
| 577 | } |
| 578 | } |
| 579 | else if (fixP->fx_done) |
| 580 | { |
| 581 | /* We're finished with this fixup. Install it because |
| 582 | bfd_install_relocation won't be called to do it. */ |
| 583 | switch (fixP->fx_r_type) |
| 584 | { |
| 585 | case BFD_RELOC_8: |
| 586 | md_number_to_chars (where, value, 1); |
| 587 | break; |
| 588 | case BFD_RELOC_16: |
| 589 | md_number_to_chars (where, value, 2); |
| 590 | break; |
| 591 | case BFD_RELOC_32: |
| 592 | md_number_to_chars (where, value, 4); |
| 593 | break; |
| 594 | /* FIXME: later add support for 64 bits. */ |
| 595 | default: |
| 596 | abort (); |
| 597 | } |
| 598 | } |
| 599 | else |
| 600 | { |
| 601 | /* bfd_install_relocation will be called to finish things up. */ |
| 602 | } |
| 603 | |
| 604 | /* Tuck `value' away for use by tc_gen_reloc. |
| 605 | See the comment describing fx_addnumber in write.h. |
| 606 | This field is misnamed (or misused :-). */ |
| 607 | fixP->fx_addnumber = value; |
| 608 | |
| 609 | return 1; |
| 610 | } |
| 611 | |
| 612 | /* Translate internal representation of relocation info to BFD target format. |
| 613 | |
| 614 | FIXME: To what extent can we get all relevant targets to use this? */ |
| 615 | |
| 616 | arelent * |
| 617 | cgen_tc_gen_reloc (section, fixP) |
| 618 | asection * section; |
| 619 | fixS * fixP; |
| 620 | { |
| 621 | arelent * reloc; |
| 622 | |
| 623 | reloc = (arelent *) bfd_alloc (stdoutput, sizeof (arelent)); |
| 624 | |
| 625 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); |
| 626 | if (reloc->howto == (reloc_howto_type *) NULL) |
| 627 | { |
| 628 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 629 | _("internal error: can't export reloc type %d (`%s')"), |
| 630 | fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type)); |
| 631 | return NULL; |
| 632 | } |
| 633 | |
| 634 | assert (!fixP->fx_pcrel == !reloc->howto->pc_relative); |
| 635 | |
| 636 | reloc->sym_ptr_ptr = & fixP->fx_addsy->bsym; |
| 637 | reloc->address = fixP->fx_frag->fr_address + fixP->fx_where; |
| 638 | reloc->addend = fixP->fx_addnumber; |
| 639 | |
| 640 | return reloc; |
| 641 | } |