| 1 | /* tc-arc.c -- Assembler for the ARC |
| 2 | Copyright 1994, 1995, 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by Doug Evans (dje@cygnus.com). |
| 5 | |
| 6 | This file is part of GAS, the GNU Assembler. |
| 7 | |
| 8 | GAS 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 2, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | GAS is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with GAS; see the file COPYING. If not, write to the Free |
| 20 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 21 | 02111-1307, USA. */ |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include "libiberty.h" |
| 25 | #include "as.h" |
| 26 | #include "struc-symbol.h" |
| 27 | #include "safe-ctype.h" |
| 28 | #include "subsegs.h" |
| 29 | #include "opcode/arc.h" |
| 30 | #include "../opcodes/arc-ext.h" |
| 31 | #include "elf/arc.h" |
| 32 | #include "dwarf2dbg.h" |
| 33 | |
| 34 | extern int arc_get_mach PARAMS ((char *)); |
| 35 | extern int arc_operand_type PARAMS ((int)); |
| 36 | extern int arc_insn_not_jl PARAMS ((arc_insn)); |
| 37 | extern int arc_limm_fixup_adjust PARAMS ((arc_insn)); |
| 38 | extern int arc_get_noshortcut_flag PARAMS ((void)); |
| 39 | extern int arc_set_ext_seg PARAMS ((void)); |
| 40 | extern void arc_code_symbol PARAMS ((expressionS *)); |
| 41 | |
| 42 | static arc_insn arc_insert_operand PARAMS ((arc_insn, |
| 43 | const struct arc_operand *, int, |
| 44 | const struct arc_operand_value *, |
| 45 | offsetT, char *, unsigned int)); |
| 46 | static void arc_common PARAMS ((int)); |
| 47 | static void arc_extinst PARAMS ((int)); |
| 48 | static void arc_extoper PARAMS ((int)); |
| 49 | static void arc_option PARAMS ((int)); |
| 50 | static int get_arc_exp_reloc_type PARAMS ((int, int, expressionS *, |
| 51 | expressionS *)); |
| 52 | |
| 53 | static void init_opcode_tables PARAMS ((int)); |
| 54 | |
| 55 | const struct suffix_classes { |
| 56 | char *name; |
| 57 | int len; |
| 58 | } suffixclass[] = { |
| 59 | { "SUFFIX_COND|SUFFIX_FLAG",23 }, |
| 60 | { "SUFFIX_FLAG", 11 }, |
| 61 | { "SUFFIX_COND", 11 }, |
| 62 | { "SUFFIX_NONE", 11 } |
| 63 | }; |
| 64 | |
| 65 | #define MAXSUFFIXCLASS (sizeof (suffixclass) / sizeof (struct suffix_classes)) |
| 66 | |
| 67 | const struct syntax_classes { |
| 68 | char *name; |
| 69 | int len; |
| 70 | int class; |
| 71 | } syntaxclass[] = { |
| 72 | { "SYNTAX_3OP|OP1_MUST_BE_IMM", 26, SYNTAX_3OP|OP1_MUST_BE_IMM|SYNTAX_VALID }, |
| 73 | { "OP1_MUST_BE_IMM|SYNTAX_3OP", 26, OP1_MUST_BE_IMM|SYNTAX_3OP|SYNTAX_VALID }, |
| 74 | { "SYNTAX_2OP|OP1_IMM_IMPLIED", 26, SYNTAX_2OP|OP1_IMM_IMPLIED|SYNTAX_VALID }, |
| 75 | { "OP1_IMM_IMPLIED|SYNTAX_2OP", 26, OP1_IMM_IMPLIED|SYNTAX_2OP|SYNTAX_VALID }, |
| 76 | { "SYNTAX_3OP", 10, SYNTAX_3OP|SYNTAX_VALID }, |
| 77 | { "SYNTAX_2OP", 10, SYNTAX_2OP|SYNTAX_VALID } |
| 78 | }; |
| 79 | |
| 80 | #define MAXSYNTAXCLASS (sizeof (syntaxclass) / sizeof (struct syntax_classes)) |
| 81 | |
| 82 | const pseudo_typeS md_pseudo_table[] = { |
| 83 | { "align", s_align_bytes, 0 }, /* Defaulting is invalid (0). */ |
| 84 | { "comm", arc_common, 0 }, |
| 85 | { "common", arc_common, 0 }, |
| 86 | { "lcomm", arc_common, 1 }, |
| 87 | { "lcommon", arc_common, 1 }, |
| 88 | { "2byte", cons, 2 }, |
| 89 | { "half", cons, 2 }, |
| 90 | { "short", cons, 2 }, |
| 91 | { "3byte", cons, 3 }, |
| 92 | { "4byte", cons, 4 }, |
| 93 | { "word", cons, 4 }, |
| 94 | { "option", arc_option, 0 }, |
| 95 | { "cpu", arc_option, 0 }, |
| 96 | { "block", s_space, 0 }, |
| 97 | { "extcondcode", arc_extoper, 0 }, |
| 98 | { "extcoreregister", arc_extoper, 1 }, |
| 99 | { "extauxregister", arc_extoper, 2 }, |
| 100 | { "extinstruction", arc_extinst, 0 }, |
| 101 | { NULL, 0, 0 }, |
| 102 | }; |
| 103 | |
| 104 | /* This array holds the chars that always start a comment. If the |
| 105 | pre-processor is disabled, these aren't very useful. */ |
| 106 | const char comment_chars[] = "#;"; |
| 107 | |
| 108 | /* This array holds the chars that only start a comment at the beginning of |
| 109 | a line. If the line seems to have the form '# 123 filename' |
| 110 | .line and .file directives will appear in the pre-processed output */ |
| 111 | /* Note that input_file.c hand checks for '#' at the beginning of the |
| 112 | first line of the input file. This is because the compiler outputs |
| 113 | #NO_APP at the beginning of its output. */ |
| 114 | /* Also note that comments started like this one will always |
| 115 | work if '/' isn't otherwise defined. */ |
| 116 | const char line_comment_chars[] = "#"; |
| 117 | |
| 118 | const char line_separator_chars[] = ""; |
| 119 | |
| 120 | /* Chars that can be used to separate mant from exp in floating point nums. */ |
| 121 | const char EXP_CHARS[] = "eE"; |
| 122 | |
| 123 | /* Chars that mean this number is a floating point constant |
| 124 | As in 0f12.456 or 0d1.2345e12. */ |
| 125 | const char FLT_CHARS[] = "rRsSfFdD"; |
| 126 | |
| 127 | /* Byte order. */ |
| 128 | extern int target_big_endian; |
| 129 | const char *arc_target_format = DEFAULT_TARGET_FORMAT; |
| 130 | static int byte_order = DEFAULT_BYTE_ORDER; |
| 131 | |
| 132 | static segT arcext_section; |
| 133 | |
| 134 | /* One of bfd_mach_arc_n. */ |
| 135 | static int arc_mach_type = bfd_mach_arc_6; |
| 136 | |
| 137 | /* Non-zero if the cpu type has been explicitly specified. */ |
| 138 | static int mach_type_specified_p = 0; |
| 139 | |
| 140 | /* Non-zero if opcode tables have been initialized. |
| 141 | A .option command must appear before any instructions. */ |
| 142 | static int cpu_tables_init_p = 0; |
| 143 | |
| 144 | static struct hash_control *arc_suffix_hash = NULL; |
| 145 | \f |
| 146 | const char *md_shortopts = ""; |
| 147 | struct option md_longopts[] = { |
| 148 | #define OPTION_EB (OPTION_MD_BASE + 0) |
| 149 | { "EB", no_argument, NULL, OPTION_EB }, |
| 150 | #define OPTION_EL (OPTION_MD_BASE + 1) |
| 151 | { "EL", no_argument, NULL, OPTION_EL }, |
| 152 | #define OPTION_ARC5 (OPTION_MD_BASE + 2) |
| 153 | { "marc5", no_argument, NULL, OPTION_ARC5 }, |
| 154 | { "pre-v6", no_argument, NULL, OPTION_ARC5 }, |
| 155 | #define OPTION_ARC6 (OPTION_MD_BASE + 3) |
| 156 | { "marc6", no_argument, NULL, OPTION_ARC6 }, |
| 157 | #define OPTION_ARC7 (OPTION_MD_BASE + 4) |
| 158 | { "marc7", no_argument, NULL, OPTION_ARC7 }, |
| 159 | #define OPTION_ARC8 (OPTION_MD_BASE + 5) |
| 160 | { "marc8", no_argument, NULL, OPTION_ARC8 }, |
| 161 | #define OPTION_ARC (OPTION_MD_BASE + 6) |
| 162 | { "marc", no_argument, NULL, OPTION_ARC }, |
| 163 | { NULL, no_argument, NULL, 0 } |
| 164 | }; |
| 165 | size_t md_longopts_size = sizeof (md_longopts); |
| 166 | |
| 167 | #define IS_SYMBOL_OPERAND(o) \ |
| 168 | ((o) == 'b' || (o) == 'c' || (o) == 's' || (o) == 'o' || (o) == 'O') |
| 169 | |
| 170 | struct arc_operand_value *get_ext_suffix (char *s); |
| 171 | |
| 172 | /* Invocation line includes a switch not recognized by the base assembler. |
| 173 | See if it's a processor-specific option. */ |
| 174 | |
| 175 | int |
| 176 | md_parse_option (c, arg) |
| 177 | int c; |
| 178 | char *arg ATTRIBUTE_UNUSED; |
| 179 | { |
| 180 | switch (c) |
| 181 | { |
| 182 | case OPTION_ARC5: |
| 183 | arc_mach_type = bfd_mach_arc_5; |
| 184 | break; |
| 185 | case OPTION_ARC: |
| 186 | case OPTION_ARC6: |
| 187 | arc_mach_type = bfd_mach_arc_6; |
| 188 | break; |
| 189 | case OPTION_ARC7: |
| 190 | arc_mach_type = bfd_mach_arc_7; |
| 191 | break; |
| 192 | case OPTION_ARC8: |
| 193 | arc_mach_type = bfd_mach_arc_8; |
| 194 | break; |
| 195 | case OPTION_EB: |
| 196 | byte_order = BIG_ENDIAN; |
| 197 | arc_target_format = "elf32-bigarc"; |
| 198 | break; |
| 199 | case OPTION_EL: |
| 200 | byte_order = LITTLE_ENDIAN; |
| 201 | arc_target_format = "elf32-littlearc"; |
| 202 | break; |
| 203 | default: |
| 204 | return 0; |
| 205 | } |
| 206 | return 1; |
| 207 | } |
| 208 | |
| 209 | void |
| 210 | md_show_usage (stream) |
| 211 | FILE *stream; |
| 212 | { |
| 213 | fprintf (stream, "\ |
| 214 | ARC Options:\n\ |
| 215 | -marc[5|6|7|8] select processor variant (default arc%d)\n\ |
| 216 | -EB assemble code for a big endian cpu\n\ |
| 217 | -EL assemble code for a little endian cpu\n", arc_mach_type + 5); |
| 218 | } |
| 219 | |
| 220 | /* This function is called once, at assembler startup time. It should |
| 221 | set up all the tables, etc. that the MD part of the assembler will need. |
| 222 | Opcode selection is deferred until later because we might see a .option |
| 223 | command. */ |
| 224 | |
| 225 | void |
| 226 | md_begin () |
| 227 | { |
| 228 | /* The endianness can be chosen "at the factory". */ |
| 229 | target_big_endian = byte_order == BIG_ENDIAN; |
| 230 | |
| 231 | if (!bfd_set_arch_mach (stdoutput, bfd_arch_arc, arc_mach_type)) |
| 232 | as_warn ("could not set architecture and machine"); |
| 233 | |
| 234 | /* This call is necessary because we need to initialize `arc_operand_map' |
| 235 | which may be needed before we see the first insn. */ |
| 236 | arc_opcode_init_tables (arc_get_opcode_mach (arc_mach_type, |
| 237 | target_big_endian)); |
| 238 | } |
| 239 | |
| 240 | /* Initialize the various opcode and operand tables. |
| 241 | MACH is one of bfd_mach_arc_xxx. */ |
| 242 | static void |
| 243 | init_opcode_tables (mach) |
| 244 | int mach; |
| 245 | { |
| 246 | int i; |
| 247 | char *last; |
| 248 | |
| 249 | if ((arc_suffix_hash = hash_new ()) == NULL) |
| 250 | as_fatal ("virtual memory exhausted"); |
| 251 | |
| 252 | if (!bfd_set_arch_mach (stdoutput, bfd_arch_arc, mach)) |
| 253 | as_warn ("could not set architecture and machine"); |
| 254 | |
| 255 | /* This initializes a few things in arc-opc.c that we need. |
| 256 | This must be called before the various arc_xxx_supported fns. */ |
| 257 | arc_opcode_init_tables (arc_get_opcode_mach (mach, target_big_endian)); |
| 258 | |
| 259 | /* Only put the first entry of each equivalently named suffix in the |
| 260 | table. */ |
| 261 | last = ""; |
| 262 | for (i = 0; i < arc_suffixes_count; i++) |
| 263 | { |
| 264 | if (strcmp (arc_suffixes[i].name, last) != 0) |
| 265 | hash_insert (arc_suffix_hash, arc_suffixes[i].name, (PTR) (arc_suffixes + i)); |
| 266 | last = arc_suffixes[i].name; |
| 267 | } |
| 268 | |
| 269 | /* Since registers don't have a prefix, we put them in the symbol table so |
| 270 | they can't be used as symbols. This also simplifies argument parsing as |
| 271 | we can let gas parse registers for us. The recorded register number is |
| 272 | the address of the register's entry in arc_reg_names. |
| 273 | |
| 274 | If the register name is already in the table, then the existing |
| 275 | definition is assumed to be from an .ExtCoreRegister pseudo-op. */ |
| 276 | |
| 277 | for (i = 0; i < arc_reg_names_count; i++) |
| 278 | { |
| 279 | if (symbol_find (arc_reg_names[i].name)) |
| 280 | continue; |
| 281 | /* Use symbol_create here instead of symbol_new so we don't try to |
| 282 | output registers into the object file's symbol table. */ |
| 283 | symbol_table_insert (symbol_create (arc_reg_names[i].name, |
| 284 | reg_section, |
| 285 | (int) &arc_reg_names[i], |
| 286 | &zero_address_frag)); |
| 287 | } |
| 288 | |
| 289 | /* Tell `.option' it's too late. */ |
| 290 | cpu_tables_init_p = 1; |
| 291 | } |
| 292 | \f |
| 293 | /* Insert an operand value into an instruction. |
| 294 | If REG is non-NULL, it is a register number and ignore VAL. */ |
| 295 | |
| 296 | static arc_insn |
| 297 | arc_insert_operand (insn, operand, mods, reg, val, file, line) |
| 298 | arc_insn insn; |
| 299 | const struct arc_operand *operand; |
| 300 | int mods; |
| 301 | const struct arc_operand_value *reg; |
| 302 | offsetT val; |
| 303 | char *file; |
| 304 | unsigned int line; |
| 305 | { |
| 306 | if (operand->bits != 32) |
| 307 | { |
| 308 | long min, max; |
| 309 | offsetT test; |
| 310 | |
| 311 | if ((operand->flags & ARC_OPERAND_SIGNED) != 0) |
| 312 | { |
| 313 | if ((operand->flags & ARC_OPERAND_SIGNOPT) != 0) |
| 314 | max = (1 << operand->bits) - 1; |
| 315 | else |
| 316 | max = (1 << (operand->bits - 1)) - 1; |
| 317 | min = - (1 << (operand->bits - 1)); |
| 318 | } |
| 319 | else |
| 320 | { |
| 321 | max = (1 << operand->bits) - 1; |
| 322 | min = 0; |
| 323 | } |
| 324 | |
| 325 | if ((operand->flags & ARC_OPERAND_NEGATIVE) != 0) |
| 326 | test = - val; |
| 327 | else |
| 328 | test = val; |
| 329 | |
| 330 | if (test < (offsetT) min || test > (offsetT) max) |
| 331 | as_warn_value_out_of_range (_("operand"), test, (offsetT) min, (offsetT) max, file, line); |
| 332 | } |
| 333 | |
| 334 | if (operand->insert) |
| 335 | { |
| 336 | const char *errmsg; |
| 337 | |
| 338 | errmsg = NULL; |
| 339 | insn = (*operand->insert) (insn, operand, mods, reg, (long) val, &errmsg); |
| 340 | if (errmsg != (const char *) NULL) |
| 341 | as_warn (errmsg); |
| 342 | } |
| 343 | else |
| 344 | insn |= (((long) val & ((1 << operand->bits) - 1)) |
| 345 | << operand->shift); |
| 346 | |
| 347 | return insn; |
| 348 | } |
| 349 | |
| 350 | /* We need to keep a list of fixups. We can't simply generate them as |
| 351 | we go, because that would require us to first create the frag, and |
| 352 | that would screw up references to ``.''. */ |
| 353 | |
| 354 | struct arc_fixup { |
| 355 | /* index into `arc_operands' */ |
| 356 | int opindex; |
| 357 | expressionS exp; |
| 358 | }; |
| 359 | |
| 360 | #define MAX_FIXUPS 5 |
| 361 | |
| 362 | #define MAX_SUFFIXES 5 |
| 363 | |
| 364 | /* This routine is called for each instruction to be assembled. */ |
| 365 | |
| 366 | void |
| 367 | md_assemble (str) |
| 368 | char *str; |
| 369 | { |
| 370 | const struct arc_opcode *opcode; |
| 371 | const struct arc_opcode *std_opcode; |
| 372 | struct arc_opcode *ext_opcode; |
| 373 | char *start; |
| 374 | const char *last_errmsg = 0; |
| 375 | arc_insn insn; |
| 376 | static int init_tables_p = 0; |
| 377 | |
| 378 | /* Opcode table initialization is deferred until here because we have to |
| 379 | wait for a possible .option command. */ |
| 380 | if (!init_tables_p) |
| 381 | { |
| 382 | init_opcode_tables (arc_mach_type); |
| 383 | init_tables_p = 1; |
| 384 | } |
| 385 | |
| 386 | /* Skip leading white space. */ |
| 387 | while (ISSPACE (*str)) |
| 388 | str++; |
| 389 | |
| 390 | /* The instructions are stored in lists hashed by the first letter (though |
| 391 | we needn't care how they're hashed). Get the first in the list. */ |
| 392 | |
| 393 | ext_opcode = arc_ext_opcodes; |
| 394 | std_opcode = arc_opcode_lookup_asm (str); |
| 395 | |
| 396 | /* Keep looking until we find a match. */ |
| 397 | |
| 398 | start = str; |
| 399 | for (opcode = (ext_opcode ? ext_opcode : std_opcode); |
| 400 | opcode != NULL; |
| 401 | opcode = (ARC_OPCODE_NEXT_ASM (opcode) |
| 402 | ? ARC_OPCODE_NEXT_ASM (opcode) |
| 403 | : (ext_opcode ? ext_opcode = NULL, std_opcode : NULL))) |
| 404 | { |
| 405 | int past_opcode_p, fc, num_suffixes; |
| 406 | int fix_up_at = 0; |
| 407 | char *syn; |
| 408 | struct arc_fixup fixups[MAX_FIXUPS]; |
| 409 | /* Used as a sanity check. If we need a limm reloc, make sure we ask |
| 410 | for an extra 4 bytes from frag_more. */ |
| 411 | int limm_reloc_p; |
| 412 | int ext_suffix_p; |
| 413 | const struct arc_operand_value *insn_suffixes[MAX_SUFFIXES]; |
| 414 | |
| 415 | /* Is this opcode supported by the selected cpu? */ |
| 416 | if (! arc_opcode_supported (opcode)) |
| 417 | continue; |
| 418 | |
| 419 | /* Scan the syntax string. If it doesn't match, try the next one. */ |
| 420 | |
| 421 | arc_opcode_init_insert (); |
| 422 | insn = opcode->value; |
| 423 | fc = 0; |
| 424 | past_opcode_p = 0; |
| 425 | num_suffixes = 0; |
| 426 | limm_reloc_p = 0; |
| 427 | ext_suffix_p = 0; |
| 428 | |
| 429 | /* We don't check for (*str != '\0') here because we want to parse |
| 430 | any trailing fake arguments in the syntax string. */ |
| 431 | for (str = start, syn = opcode->syntax; *syn != '\0';) |
| 432 | { |
| 433 | int mods; |
| 434 | const struct arc_operand *operand; |
| 435 | |
| 436 | /* Non operand chars must match exactly. */ |
| 437 | if (*syn != '%' || *++syn == '%') |
| 438 | { |
| 439 | /* Handle '+' specially as we want to allow "ld r0,[sp-4]". */ |
| 440 | /* ??? The syntax has changed to [sp,-4]. */ |
| 441 | if (0 && *syn == '+' && *str == '-') |
| 442 | { |
| 443 | /* Skip over syn's +, but leave str's - alone. |
| 444 | That makes the case identical to "ld r0,[sp+-4]". */ |
| 445 | ++syn; |
| 446 | } |
| 447 | else if (*str == *syn) |
| 448 | { |
| 449 | if (*syn == ' ') |
| 450 | past_opcode_p = 1; |
| 451 | ++syn; |
| 452 | ++str; |
| 453 | } |
| 454 | else |
| 455 | break; |
| 456 | continue; |
| 457 | } |
| 458 | |
| 459 | /* We have an operand. Pick out any modifiers. */ |
| 460 | mods = 0; |
| 461 | while (ARC_MOD_P (arc_operands[arc_operand_map[(int) *syn]].flags)) |
| 462 | { |
| 463 | mods |= arc_operands[arc_operand_map[(int) *syn]].flags & ARC_MOD_BITS; |
| 464 | ++syn; |
| 465 | } |
| 466 | operand = arc_operands + arc_operand_map[(int) *syn]; |
| 467 | if (operand->fmt == 0) |
| 468 | as_fatal ("unknown syntax format character `%c'", *syn); |
| 469 | |
| 470 | if (operand->flags & ARC_OPERAND_FAKE) |
| 471 | { |
| 472 | const char *errmsg = NULL; |
| 473 | if (operand->insert) |
| 474 | { |
| 475 | insn = (*operand->insert) (insn, operand, mods, NULL, 0, &errmsg); |
| 476 | if (errmsg != (const char *) NULL) |
| 477 | { |
| 478 | last_errmsg = errmsg; |
| 479 | if (operand->flags & ARC_OPERAND_ERROR) |
| 480 | { |
| 481 | as_bad (errmsg); |
| 482 | return; |
| 483 | } |
| 484 | else if (operand->flags & ARC_OPERAND_WARN) |
| 485 | as_warn (errmsg); |
| 486 | break; |
| 487 | } |
| 488 | if (limm_reloc_p |
| 489 | && (operand->flags && operand->flags & ARC_OPERAND_LIMM) |
| 490 | && (operand->flags & |
| 491 | (ARC_OPERAND_ABSOLUTE_BRANCH | ARC_OPERAND_ADDRESS))) |
| 492 | { |
| 493 | fixups[fix_up_at].opindex = arc_operand_map[operand->fmt]; |
| 494 | } |
| 495 | } |
| 496 | ++syn; |
| 497 | } |
| 498 | /* Are we finished with suffixes? */ |
| 499 | else if (!past_opcode_p) |
| 500 | { |
| 501 | int found; |
| 502 | char c; |
| 503 | char *s, *t; |
| 504 | const struct arc_operand_value *suf, *suffix_end; |
| 505 | const struct arc_operand_value *suffix = NULL; |
| 506 | |
| 507 | if (!(operand->flags & ARC_OPERAND_SUFFIX)) |
| 508 | abort (); |
| 509 | |
| 510 | /* If we're at a space in the input string, we want to skip the |
| 511 | remaining suffixes. There may be some fake ones though, so |
| 512 | just go on to try the next one. */ |
| 513 | if (*str == ' ') |
| 514 | { |
| 515 | ++syn; |
| 516 | continue; |
| 517 | } |
| 518 | |
| 519 | s = str; |
| 520 | if (mods & ARC_MOD_DOT) |
| 521 | { |
| 522 | if (*s != '.') |
| 523 | break; |
| 524 | ++s; |
| 525 | } |
| 526 | else |
| 527 | { |
| 528 | /* This can happen in "b.nd foo" and we're currently looking |
| 529 | for "%q" (ie: a condition code suffix). */ |
| 530 | if (*s == '.') |
| 531 | { |
| 532 | ++syn; |
| 533 | continue; |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | /* Pick the suffix out and look it up via the hash table. */ |
| 538 | for (t = s; *t && ISALNUM (*t); ++t) |
| 539 | continue; |
| 540 | c = *t; |
| 541 | *t = '\0'; |
| 542 | if ((suf = get_ext_suffix (s))) |
| 543 | ext_suffix_p = 1; |
| 544 | else |
| 545 | suf = hash_find (arc_suffix_hash, s); |
| 546 | if (!suf) |
| 547 | { |
| 548 | /* This can happen in "blle foo" and we're currently using |
| 549 | the template "b%q%.n %j". The "bl" insn occurs later in |
| 550 | the table so "lle" isn't an illegal suffix. */ |
| 551 | *t = c; |
| 552 | break; |
| 553 | } |
| 554 | |
| 555 | /* Is it the right type? Note that the same character is used |
| 556 | several times, so we have to examine all of them. This is |
| 557 | relatively efficient as equivalent entries are kept |
| 558 | together. If it's not the right type, don't increment `str' |
| 559 | so we try the next one in the series. */ |
| 560 | found = 0; |
| 561 | if (ext_suffix_p && arc_operands[suf->type].fmt == *syn) |
| 562 | { |
| 563 | /* Insert the suffix's value into the insn. */ |
| 564 | *t = c; |
| 565 | if (operand->insert) |
| 566 | insn = (*operand->insert) (insn, operand, |
| 567 | mods, NULL, suf->value, |
| 568 | NULL); |
| 569 | else |
| 570 | insn |= suf->value << operand->shift; |
| 571 | |
| 572 | str = t; |
| 573 | found = 1; |
| 574 | } |
| 575 | else |
| 576 | { |
| 577 | *t = c; |
| 578 | suffix_end = arc_suffixes + arc_suffixes_count; |
| 579 | for (suffix = suf; |
| 580 | suffix < suffix_end && strcmp (suffix->name, suf->name) == 0; |
| 581 | ++suffix) |
| 582 | { |
| 583 | if (arc_operands[suffix->type].fmt == *syn) |
| 584 | { |
| 585 | /* Insert the suffix's value into the insn. */ |
| 586 | if (operand->insert) |
| 587 | insn = (*operand->insert) (insn, operand, |
| 588 | mods, NULL, suffix->value, |
| 589 | NULL); |
| 590 | else |
| 591 | insn |= suffix->value << operand->shift; |
| 592 | |
| 593 | str = t; |
| 594 | found = 1; |
| 595 | break; |
| 596 | } |
| 597 | } |
| 598 | } |
| 599 | ++syn; |
| 600 | if (!found) |
| 601 | /* Wrong type. Just go on to try next insn entry. */ |
| 602 | ; |
| 603 | else |
| 604 | { |
| 605 | if (num_suffixes == MAX_SUFFIXES) |
| 606 | as_bad ("too many suffixes"); |
| 607 | else |
| 608 | insn_suffixes[num_suffixes++] = suffix; |
| 609 | } |
| 610 | } |
| 611 | else |
| 612 | /* This is either a register or an expression of some kind. */ |
| 613 | { |
| 614 | char *hold; |
| 615 | const struct arc_operand_value *reg = NULL; |
| 616 | long value = 0; |
| 617 | expressionS exp; |
| 618 | |
| 619 | if (operand->flags & ARC_OPERAND_SUFFIX) |
| 620 | abort (); |
| 621 | |
| 622 | /* Is there anything left to parse? |
| 623 | We don't check for this at the top because we want to parse |
| 624 | any trailing fake arguments in the syntax string. */ |
| 625 | if (is_end_of_line[(unsigned char) *str]) |
| 626 | break; |
| 627 | |
| 628 | /* Parse the operand. */ |
| 629 | hold = input_line_pointer; |
| 630 | input_line_pointer = str; |
| 631 | expression (&exp); |
| 632 | str = input_line_pointer; |
| 633 | input_line_pointer = hold; |
| 634 | |
| 635 | if (exp.X_op == O_illegal) |
| 636 | as_bad ("illegal operand"); |
| 637 | else if (exp.X_op == O_absent) |
| 638 | as_bad ("missing operand"); |
| 639 | else if (exp.X_op == O_constant) |
| 640 | { |
| 641 | value = exp.X_add_number; |
| 642 | } |
| 643 | else if (exp.X_op == O_register) |
| 644 | { |
| 645 | reg = (struct arc_operand_value *) exp.X_add_number; |
| 646 | } |
| 647 | #define IS_REG_DEST_OPERAND(o) ((o) == 'a') |
| 648 | else if (IS_REG_DEST_OPERAND (*syn)) |
| 649 | as_bad ("symbol as destination register"); |
| 650 | else |
| 651 | { |
| 652 | if (!strncmp (str, "@h30", 4)) |
| 653 | { |
| 654 | arc_code_symbol (&exp); |
| 655 | str += 4; |
| 656 | } |
| 657 | /* We need to generate a fixup for this expression. */ |
| 658 | if (fc >= MAX_FIXUPS) |
| 659 | as_fatal ("too many fixups"); |
| 660 | fixups[fc].exp = exp; |
| 661 | /* We don't support shimm relocs. break here to force |
| 662 | the assembler to output a limm. */ |
| 663 | #define IS_REG_SHIMM_OFFSET(o) ((o) == 'd') |
| 664 | if (IS_REG_SHIMM_OFFSET (*syn)) |
| 665 | break; |
| 666 | /* If this is a register constant (IE: one whose |
| 667 | register value gets stored as 61-63) then this |
| 668 | must be a limm. */ |
| 669 | /* ??? This bit could use some cleaning up. |
| 670 | Referencing the format chars like this goes |
| 671 | against style. */ |
| 672 | if (IS_SYMBOL_OPERAND (*syn)) |
| 673 | { |
| 674 | const char *junk; |
| 675 | limm_reloc_p = 1; |
| 676 | /* Save this, we don't yet know what reloc to use. */ |
| 677 | fix_up_at = fc; |
| 678 | /* Tell insert_reg we need a limm. This is |
| 679 | needed because the value at this point is |
| 680 | zero, a shimm. */ |
| 681 | /* ??? We need a cleaner interface than this. */ |
| 682 | (*arc_operands[arc_operand_map['Q']].insert) |
| 683 | (insn, operand, mods, reg, 0L, &junk); |
| 684 | } |
| 685 | else |
| 686 | fixups[fc].opindex = arc_operand_map[(int) *syn]; |
| 687 | ++fc; |
| 688 | value = 0; |
| 689 | } |
| 690 | |
| 691 | /* Insert the register or expression into the instruction. */ |
| 692 | if (operand->insert) |
| 693 | { |
| 694 | const char *errmsg = NULL; |
| 695 | insn = (*operand->insert) (insn, operand, mods, |
| 696 | reg, (long) value, &errmsg); |
| 697 | if (errmsg != (const char *) NULL) |
| 698 | { |
| 699 | last_errmsg = errmsg; |
| 700 | if (operand->flags & ARC_OPERAND_ERROR) |
| 701 | { |
| 702 | as_bad (errmsg); |
| 703 | return; |
| 704 | } |
| 705 | else if (operand->flags & ARC_OPERAND_WARN) |
| 706 | as_warn (errmsg); |
| 707 | break; |
| 708 | } |
| 709 | } |
| 710 | else |
| 711 | insn |= (value & ((1 << operand->bits) - 1)) << operand->shift; |
| 712 | |
| 713 | ++syn; |
| 714 | } |
| 715 | } |
| 716 | |
| 717 | /* If we're at the end of the syntax string, we're done. */ |
| 718 | /* FIXME: try to move this to a separate function. */ |
| 719 | if (*syn == '\0') |
| 720 | { |
| 721 | int i; |
| 722 | char *f; |
| 723 | long limm, limm_p; |
| 724 | |
| 725 | /* For the moment we assume a valid `str' can only contain blanks |
| 726 | now. IE: We needn't try again with a longer version of the |
| 727 | insn and it is assumed that longer versions of insns appear |
| 728 | before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */ |
| 729 | |
| 730 | while (ISSPACE (*str)) |
| 731 | ++str; |
| 732 | |
| 733 | if (!is_end_of_line[(unsigned char) *str]) |
| 734 | as_bad ("junk at end of line: `%s'", str); |
| 735 | |
| 736 | /* Is there a limm value? */ |
| 737 | limm_p = arc_opcode_limm_p (&limm); |
| 738 | |
| 739 | /* Perform various error and warning tests. */ |
| 740 | |
| 741 | { |
| 742 | static int in_delay_slot_p = 0; |
| 743 | static int prev_insn_needs_cc_nop_p = 0; |
| 744 | /* delay slot type seen */ |
| 745 | int delay_slot_type = ARC_DELAY_NONE; |
| 746 | /* conditional execution flag seen */ |
| 747 | int conditional = 0; |
| 748 | /* 1 if condition codes are being set */ |
| 749 | int cc_set_p = 0; |
| 750 | /* 1 if conditional branch, including `b' "branch always" */ |
| 751 | int cond_branch_p = opcode->flags & ARC_OPCODE_COND_BRANCH; |
| 752 | |
| 753 | for (i = 0; i < num_suffixes; ++i) |
| 754 | { |
| 755 | switch (arc_operands[insn_suffixes[i]->type].fmt) |
| 756 | { |
| 757 | case 'n': |
| 758 | delay_slot_type = insn_suffixes[i]->value; |
| 759 | break; |
| 760 | case 'q': |
| 761 | conditional = insn_suffixes[i]->value; |
| 762 | break; |
| 763 | case 'f': |
| 764 | cc_set_p = 1; |
| 765 | break; |
| 766 | } |
| 767 | } |
| 768 | |
| 769 | /* Putting an insn with a limm value in a delay slot is supposed to |
| 770 | be legal, but let's warn the user anyway. Ditto for 8 byte |
| 771 | jumps with delay slots. */ |
| 772 | if (in_delay_slot_p && limm_p) |
| 773 | as_warn ("8 byte instruction in delay slot"); |
| 774 | if (delay_slot_type != ARC_DELAY_NONE |
| 775 | && limm_p && arc_insn_not_jl (insn)) /* except for jl addr */ |
| 776 | as_warn ("8 byte jump instruction with delay slot"); |
| 777 | in_delay_slot_p = (delay_slot_type != ARC_DELAY_NONE) && !limm_p; |
| 778 | |
| 779 | /* Warn when a conditional branch immediately follows a set of |
| 780 | the condition codes. Note that this needn't be done if the |
| 781 | insn that sets the condition codes uses a limm. */ |
| 782 | if (cond_branch_p && conditional != 0 /* 0 = "always" */ |
| 783 | && prev_insn_needs_cc_nop_p && arc_mach_type == bfd_mach_arc_5) |
| 784 | as_warn ("conditional branch follows set of flags"); |
| 785 | prev_insn_needs_cc_nop_p = |
| 786 | /* FIXME: ??? not required: |
| 787 | (delay_slot_type != ARC_DELAY_NONE) && */ |
| 788 | cc_set_p && !limm_p; |
| 789 | } |
| 790 | |
| 791 | /* Write out the instruction. |
| 792 | It is important to fetch enough space in one call to `frag_more'. |
| 793 | We use (f - frag_now->fr_literal) to compute where we are and we |
| 794 | don't want frag_now to change between calls. */ |
| 795 | if (limm_p) |
| 796 | { |
| 797 | f = frag_more (8); |
| 798 | md_number_to_chars (f, insn, 4); |
| 799 | md_number_to_chars (f + 4, limm, 4); |
| 800 | dwarf2_emit_insn (8); |
| 801 | } |
| 802 | else if (limm_reloc_p) |
| 803 | { |
| 804 | /* We need a limm reloc, but the tables think we don't. */ |
| 805 | abort (); |
| 806 | } |
| 807 | else |
| 808 | { |
| 809 | f = frag_more (4); |
| 810 | md_number_to_chars (f, insn, 4); |
| 811 | dwarf2_emit_insn (4); |
| 812 | } |
| 813 | |
| 814 | /* Create any fixups. */ |
| 815 | for (i = 0; i < fc; ++i) |
| 816 | { |
| 817 | int op_type, reloc_type; |
| 818 | expressionS exptmp; |
| 819 | const struct arc_operand *operand; |
| 820 | |
| 821 | /* Create a fixup for this operand. |
| 822 | At this point we do not use a bfd_reloc_code_real_type for |
| 823 | operands residing in the insn, but instead just use the |
| 824 | operand index. This lets us easily handle fixups for any |
| 825 | operand type, although that is admittedly not a very exciting |
| 826 | feature. We pick a BFD reloc type in md_apply_fix3. |
| 827 | |
| 828 | Limm values (4 byte immediate "constants") must be treated |
| 829 | normally because they're not part of the actual insn word |
| 830 | and thus the insertion routines don't handle them. */ |
| 831 | |
| 832 | if (arc_operands[fixups[i].opindex].flags & ARC_OPERAND_LIMM) |
| 833 | { |
| 834 | /* Modify the fixup addend as required by the cpu. */ |
| 835 | fixups[i].exp.X_add_number += arc_limm_fixup_adjust (insn); |
| 836 | op_type = fixups[i].opindex; |
| 837 | /* FIXME: can we add this data to the operand table? */ |
| 838 | if (op_type == arc_operand_map['L'] |
| 839 | || op_type == arc_operand_map['s'] |
| 840 | || op_type == arc_operand_map['o'] |
| 841 | || op_type == arc_operand_map['O']) |
| 842 | reloc_type = BFD_RELOC_32; |
| 843 | else if (op_type == arc_operand_map['J']) |
| 844 | reloc_type = BFD_RELOC_ARC_B26; |
| 845 | else |
| 846 | abort (); |
| 847 | reloc_type = get_arc_exp_reloc_type (1, reloc_type, |
| 848 | &fixups[i].exp, |
| 849 | &exptmp); |
| 850 | } |
| 851 | else |
| 852 | { |
| 853 | op_type = get_arc_exp_reloc_type (0, fixups[i].opindex, |
| 854 | &fixups[i].exp, &exptmp); |
| 855 | reloc_type = op_type + (int) BFD_RELOC_UNUSED; |
| 856 | } |
| 857 | operand = &arc_operands[op_type]; |
| 858 | fix_new_exp (frag_now, |
| 859 | ((f - frag_now->fr_literal) |
| 860 | + (operand->flags & ARC_OPERAND_LIMM ? 4 : 0)), 4, |
| 861 | &exptmp, |
| 862 | (operand->flags & ARC_OPERAND_RELATIVE_BRANCH) != 0, |
| 863 | (bfd_reloc_code_real_type) reloc_type); |
| 864 | } |
| 865 | |
| 866 | /* All done. */ |
| 867 | return; |
| 868 | } |
| 869 | |
| 870 | /* Try the next entry. */ |
| 871 | } |
| 872 | |
| 873 | if (NULL == last_errmsg) |
| 874 | as_bad ("bad instruction `%s'", start); |
| 875 | else |
| 876 | as_bad (last_errmsg); |
| 877 | } |
| 878 | \f |
| 879 | static void |
| 880 | arc_extoper (opertype) |
| 881 | int opertype; |
| 882 | { |
| 883 | char *name; |
| 884 | char *mode; |
| 885 | char c; |
| 886 | char *p; |
| 887 | int imode = 0; |
| 888 | int number; |
| 889 | struct arc_ext_operand_value *ext_oper; |
| 890 | symbolS *symbolP; |
| 891 | |
| 892 | segT old_sec; |
| 893 | int old_subsec; |
| 894 | |
| 895 | name = input_line_pointer; |
| 896 | c = get_symbol_end (); |
| 897 | name = xstrdup (name); |
| 898 | |
| 899 | p = name; |
| 900 | while (*p) |
| 901 | { |
| 902 | *p = TOLOWER (*p); |
| 903 | p++; |
| 904 | } |
| 905 | |
| 906 | /* just after name is now '\0' */ |
| 907 | p = input_line_pointer; |
| 908 | *p = c; |
| 909 | SKIP_WHITESPACE (); |
| 910 | |
| 911 | if (*input_line_pointer != ',') |
| 912 | { |
| 913 | as_bad ("expected comma after operand name"); |
| 914 | ignore_rest_of_line (); |
| 915 | free (name); |
| 916 | return; |
| 917 | } |
| 918 | |
| 919 | input_line_pointer++; /* skip ',' */ |
| 920 | number = get_absolute_expression (); |
| 921 | |
| 922 | if (number < 0) |
| 923 | { |
| 924 | as_bad ("negative operand number %d", number); |
| 925 | ignore_rest_of_line (); |
| 926 | free (name); |
| 927 | return; |
| 928 | } |
| 929 | |
| 930 | if (opertype) |
| 931 | { |
| 932 | SKIP_WHITESPACE (); |
| 933 | |
| 934 | if (*input_line_pointer != ',') |
| 935 | { |
| 936 | as_bad ("expected comma after register-number"); |
| 937 | ignore_rest_of_line (); |
| 938 | free (name); |
| 939 | return; |
| 940 | } |
| 941 | |
| 942 | input_line_pointer++; /* skip ',' */ |
| 943 | mode = input_line_pointer; |
| 944 | |
| 945 | if (!strncmp (mode, "r|w", 3)) |
| 946 | { |
| 947 | imode = 0; |
| 948 | input_line_pointer += 3; |
| 949 | } |
| 950 | else |
| 951 | { |
| 952 | if (!strncmp (mode, "r", 1)) |
| 953 | { |
| 954 | imode = ARC_REGISTER_READONLY; |
| 955 | input_line_pointer += 1; |
| 956 | } |
| 957 | else |
| 958 | { |
| 959 | if (strncmp (mode, "w", 1)) |
| 960 | { |
| 961 | as_bad ("invalid mode"); |
| 962 | ignore_rest_of_line (); |
| 963 | free (name); |
| 964 | return; |
| 965 | } |
| 966 | else |
| 967 | { |
| 968 | imode = ARC_REGISTER_WRITEONLY; |
| 969 | input_line_pointer += 1; |
| 970 | } |
| 971 | } |
| 972 | } |
| 973 | SKIP_WHITESPACE (); |
| 974 | if (1 == opertype) |
| 975 | { |
| 976 | if (*input_line_pointer != ',') |
| 977 | { |
| 978 | as_bad ("expected comma after register-mode"); |
| 979 | ignore_rest_of_line (); |
| 980 | free (name); |
| 981 | return; |
| 982 | } |
| 983 | |
| 984 | input_line_pointer++; /* skip ',' */ |
| 985 | |
| 986 | if (!strncmp (input_line_pointer, "cannot_shortcut", 15)) |
| 987 | { |
| 988 | imode |= arc_get_noshortcut_flag (); |
| 989 | input_line_pointer += 15; |
| 990 | } |
| 991 | else |
| 992 | { |
| 993 | if (strncmp (input_line_pointer, "can_shortcut", 12)) |
| 994 | { |
| 995 | as_bad ("shortcut designator invalid"); |
| 996 | ignore_rest_of_line (); |
| 997 | free (name); |
| 998 | return; |
| 999 | } |
| 1000 | else |
| 1001 | { |
| 1002 | input_line_pointer += 12; |
| 1003 | } |
| 1004 | } |
| 1005 | } |
| 1006 | } |
| 1007 | |
| 1008 | if ((opertype == 1) && number > 60) |
| 1009 | { |
| 1010 | as_bad ("core register value (%d) too large", number); |
| 1011 | ignore_rest_of_line (); |
| 1012 | free (name); |
| 1013 | return; |
| 1014 | } |
| 1015 | |
| 1016 | if ((opertype == 0) && number > 31) |
| 1017 | { |
| 1018 | as_bad ("condition code value (%d) too large", number); |
| 1019 | ignore_rest_of_line (); |
| 1020 | free (name); |
| 1021 | return; |
| 1022 | } |
| 1023 | |
| 1024 | ext_oper = (struct arc_ext_operand_value *) \ |
| 1025 | xmalloc (sizeof (struct arc_ext_operand_value)); |
| 1026 | |
| 1027 | if (opertype) |
| 1028 | { |
| 1029 | /* If the symbol already exists, point it at the new definition. */ |
| 1030 | if ((symbolP = symbol_find (name))) |
| 1031 | { |
| 1032 | if (S_GET_SEGMENT (symbolP) == reg_section) |
| 1033 | S_SET_VALUE (symbolP, (int) &ext_oper->operand); |
| 1034 | else |
| 1035 | { |
| 1036 | as_bad ("attempt to override symbol: %s", name); |
| 1037 | ignore_rest_of_line (); |
| 1038 | free (name); |
| 1039 | free (ext_oper); |
| 1040 | return; |
| 1041 | } |
| 1042 | } |
| 1043 | else |
| 1044 | { |
| 1045 | /* If its not there, add it. */ |
| 1046 | symbol_table_insert (symbol_create (name, reg_section, |
| 1047 | (int) &ext_oper->operand, &zero_address_frag)); |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | ext_oper->operand.name = name; |
| 1052 | ext_oper->operand.value = number; |
| 1053 | ext_oper->operand.type = arc_operand_type (opertype); |
| 1054 | ext_oper->operand.flags = imode; |
| 1055 | |
| 1056 | ext_oper->next = arc_ext_operands; |
| 1057 | arc_ext_operands = ext_oper; |
| 1058 | |
| 1059 | /* OK, now that we know what this operand is, put a description in |
| 1060 | the arc extension section of the output file. */ |
| 1061 | |
| 1062 | old_sec = now_seg; |
| 1063 | old_subsec = now_subseg; |
| 1064 | |
| 1065 | arc_set_ext_seg (); |
| 1066 | |
| 1067 | switch (opertype) |
| 1068 | { |
| 1069 | case 0: |
| 1070 | p = frag_more (1); |
| 1071 | *p = 3 + strlen (name) + 1; |
| 1072 | p = frag_more (1); |
| 1073 | *p = EXT_COND_CODE; |
| 1074 | p = frag_more (1); |
| 1075 | *p = number; |
| 1076 | p = frag_more (strlen (name) + 1); |
| 1077 | strcpy (p, name); |
| 1078 | break; |
| 1079 | case 1: |
| 1080 | p = frag_more (1); |
| 1081 | *p = 3 + strlen (name) + 1; |
| 1082 | p = frag_more (1); |
| 1083 | *p = EXT_CORE_REGISTER; |
| 1084 | p = frag_more (1); |
| 1085 | *p = number; |
| 1086 | p = frag_more (strlen (name) + 1); |
| 1087 | strcpy (p, name); |
| 1088 | break; |
| 1089 | case 2: |
| 1090 | p = frag_more (1); |
| 1091 | *p = 6 + strlen (name) + 1; |
| 1092 | p = frag_more (1); |
| 1093 | *p = EXT_AUX_REGISTER; |
| 1094 | p = frag_more (1); |
| 1095 | *p = number >> 24 & 0xff; |
| 1096 | p = frag_more (1); |
| 1097 | *p = number >> 16 & 0xff; |
| 1098 | p = frag_more (1); |
| 1099 | *p = number >> 8 & 0xff; |
| 1100 | p = frag_more (1); |
| 1101 | *p = number & 0xff; |
| 1102 | p = frag_more (strlen (name) + 1); |
| 1103 | strcpy (p, name); |
| 1104 | break; |
| 1105 | default: |
| 1106 | as_bad ("invalid opertype"); |
| 1107 | ignore_rest_of_line (); |
| 1108 | free (name); |
| 1109 | return; |
| 1110 | break; |
| 1111 | } |
| 1112 | |
| 1113 | subseg_set (old_sec, old_subsec); |
| 1114 | |
| 1115 | /* Enter all registers into the symbol table. */ |
| 1116 | |
| 1117 | demand_empty_rest_of_line (); |
| 1118 | } |
| 1119 | |
| 1120 | static void |
| 1121 | arc_extinst (ignore) |
| 1122 | int ignore ATTRIBUTE_UNUSED; |
| 1123 | { |
| 1124 | unsigned char syntax[129]; |
| 1125 | char *name; |
| 1126 | char *p; |
| 1127 | char c; |
| 1128 | int suffixcode = -1; |
| 1129 | int opcode, subopcode; |
| 1130 | int i; |
| 1131 | int class = 0; |
| 1132 | int name_len; |
| 1133 | struct arc_opcode *ext_op; |
| 1134 | |
| 1135 | segT old_sec; |
| 1136 | int old_subsec; |
| 1137 | |
| 1138 | name = input_line_pointer; |
| 1139 | c = get_symbol_end (); |
| 1140 | name = xstrdup (name); |
| 1141 | strcpy (syntax, name); |
| 1142 | name_len = strlen (name); |
| 1143 | |
| 1144 | /* just after name is now '\0' */ |
| 1145 | p = input_line_pointer; |
| 1146 | *p = c; |
| 1147 | |
| 1148 | SKIP_WHITESPACE (); |
| 1149 | |
| 1150 | if (*input_line_pointer != ',') |
| 1151 | { |
| 1152 | as_bad ("expected comma after operand name"); |
| 1153 | ignore_rest_of_line (); |
| 1154 | return; |
| 1155 | } |
| 1156 | |
| 1157 | input_line_pointer++; /* skip ',' */ |
| 1158 | opcode = get_absolute_expression (); |
| 1159 | |
| 1160 | SKIP_WHITESPACE (); |
| 1161 | |
| 1162 | if (*input_line_pointer != ',') |
| 1163 | { |
| 1164 | as_bad ("expected comma after opcode"); |
| 1165 | ignore_rest_of_line (); |
| 1166 | return; |
| 1167 | } |
| 1168 | |
| 1169 | input_line_pointer++; /* skip ',' */ |
| 1170 | subopcode = get_absolute_expression (); |
| 1171 | |
| 1172 | if (subopcode < 0) |
| 1173 | { |
| 1174 | as_bad ("negative subopcode %d", subopcode); |
| 1175 | ignore_rest_of_line (); |
| 1176 | return; |
| 1177 | } |
| 1178 | |
| 1179 | if (subopcode) |
| 1180 | { |
| 1181 | if (3 != opcode) |
| 1182 | { |
| 1183 | as_bad ("subcode value found when opcode not equal 0x03"); |
| 1184 | ignore_rest_of_line (); |
| 1185 | return; |
| 1186 | } |
| 1187 | else |
| 1188 | { |
| 1189 | if (subopcode < 0x09 || subopcode == 0x3f) |
| 1190 | { |
| 1191 | as_bad ("invalid subopcode %d", subopcode); |
| 1192 | ignore_rest_of_line (); |
| 1193 | return; |
| 1194 | } |
| 1195 | } |
| 1196 | } |
| 1197 | |
| 1198 | SKIP_WHITESPACE (); |
| 1199 | |
| 1200 | if (*input_line_pointer != ',') |
| 1201 | { |
| 1202 | as_bad ("expected comma after subopcode"); |
| 1203 | ignore_rest_of_line (); |
| 1204 | return; |
| 1205 | } |
| 1206 | |
| 1207 | input_line_pointer++; /* skip ',' */ |
| 1208 | |
| 1209 | for (i = 0; i < (int) MAXSUFFIXCLASS; i++) |
| 1210 | { |
| 1211 | if (!strncmp (suffixclass[i].name,input_line_pointer, suffixclass[i].len)) |
| 1212 | { |
| 1213 | suffixcode = i; |
| 1214 | input_line_pointer += suffixclass[i].len; |
| 1215 | break; |
| 1216 | } |
| 1217 | } |
| 1218 | |
| 1219 | if (-1 == suffixcode) |
| 1220 | { |
| 1221 | as_bad ("invalid suffix class"); |
| 1222 | ignore_rest_of_line (); |
| 1223 | return; |
| 1224 | } |
| 1225 | |
| 1226 | SKIP_WHITESPACE (); |
| 1227 | |
| 1228 | if (*input_line_pointer != ',') |
| 1229 | { |
| 1230 | as_bad ("expected comma after suffix class"); |
| 1231 | ignore_rest_of_line (); |
| 1232 | return; |
| 1233 | } |
| 1234 | |
| 1235 | input_line_pointer++; /* skip ',' */ |
| 1236 | |
| 1237 | for (i = 0; i < (int) MAXSYNTAXCLASS; i++) |
| 1238 | { |
| 1239 | if (!strncmp (syntaxclass[i].name,input_line_pointer, syntaxclass[i].len)) |
| 1240 | { |
| 1241 | class = syntaxclass[i].class; |
| 1242 | input_line_pointer += syntaxclass[i].len; |
| 1243 | break; |
| 1244 | } |
| 1245 | } |
| 1246 | |
| 1247 | if (0 == (SYNTAX_VALID & class)) |
| 1248 | { |
| 1249 | as_bad ("invalid syntax class"); |
| 1250 | ignore_rest_of_line (); |
| 1251 | return; |
| 1252 | } |
| 1253 | |
| 1254 | if ((0x3 == opcode) & (class & SYNTAX_3OP)) |
| 1255 | { |
| 1256 | as_bad ("opcode 0x3 and SYNTAX_3OP invalid"); |
| 1257 | ignore_rest_of_line (); |
| 1258 | return; |
| 1259 | } |
| 1260 | |
| 1261 | switch (suffixcode) |
| 1262 | { |
| 1263 | case 0: |
| 1264 | strcat (syntax, "%.q%.f "); |
| 1265 | break; |
| 1266 | case 1: |
| 1267 | strcat (syntax, "%.f "); |
| 1268 | break; |
| 1269 | case 2: |
| 1270 | strcat (syntax, "%.q "); |
| 1271 | break; |
| 1272 | case 3: |
| 1273 | strcat (syntax, " "); |
| 1274 | break; |
| 1275 | default: |
| 1276 | as_bad ("unknown suffix class"); |
| 1277 | ignore_rest_of_line (); |
| 1278 | return; |
| 1279 | break; |
| 1280 | }; |
| 1281 | |
| 1282 | strcat (syntax, ((opcode == 0x3) ? "%a,%b" : ((class & SYNTAX_3OP) ? "%a,%b,%c" : "%b,%c"))); |
| 1283 | if (suffixcode < 2) |
| 1284 | strcat (syntax, "%F"); |
| 1285 | strcat (syntax, "%S%L"); |
| 1286 | |
| 1287 | ext_op = (struct arc_opcode *) xmalloc (sizeof (struct arc_opcode)); |
| 1288 | ext_op->syntax = xstrdup (syntax); |
| 1289 | |
| 1290 | ext_op->mask = I (-1) | ((0x3 == opcode) ? C (-1) : 0); |
| 1291 | ext_op->value = I (opcode) | ((0x3 == opcode) ? C (subopcode) : 0); |
| 1292 | ext_op->flags = class; |
| 1293 | ext_op->next_asm = arc_ext_opcodes; |
| 1294 | ext_op->next_dis = arc_ext_opcodes; |
| 1295 | arc_ext_opcodes = ext_op; |
| 1296 | |
| 1297 | /* OK, now that we know what this inst is, put a description in the |
| 1298 | arc extension section of the output file. */ |
| 1299 | |
| 1300 | old_sec = now_seg; |
| 1301 | old_subsec = now_subseg; |
| 1302 | |
| 1303 | arc_set_ext_seg (); |
| 1304 | |
| 1305 | p = frag_more (1); |
| 1306 | *p = 5 + name_len + 1; |
| 1307 | p = frag_more (1); |
| 1308 | *p = EXT_INSTRUCTION; |
| 1309 | p = frag_more (1); |
| 1310 | *p = opcode; |
| 1311 | p = frag_more (1); |
| 1312 | *p = subopcode; |
| 1313 | p = frag_more (1); |
| 1314 | *p = (class & (OP1_MUST_BE_IMM | OP1_IMM_IMPLIED) ? IGNORE_FIRST_OPD : 0); |
| 1315 | p = frag_more (name_len); |
| 1316 | strncpy (p, syntax, name_len); |
| 1317 | p = frag_more (1); |
| 1318 | *p = '\0'; |
| 1319 | |
| 1320 | subseg_set (old_sec, old_subsec); |
| 1321 | |
| 1322 | demand_empty_rest_of_line (); |
| 1323 | } |
| 1324 | |
| 1325 | int |
| 1326 | arc_set_ext_seg () |
| 1327 | { |
| 1328 | if (!arcext_section) |
| 1329 | { |
| 1330 | arcext_section = subseg_new (".arcextmap", 0); |
| 1331 | bfd_set_section_flags (stdoutput, arcext_section, |
| 1332 | SEC_READONLY | SEC_HAS_CONTENTS); |
| 1333 | } |
| 1334 | else |
| 1335 | subseg_set (arcext_section, 0); |
| 1336 | return 1; |
| 1337 | } |
| 1338 | |
| 1339 | static void |
| 1340 | arc_common (localScope) |
| 1341 | int localScope; |
| 1342 | { |
| 1343 | char *name; |
| 1344 | char c; |
| 1345 | char *p; |
| 1346 | int align, size; |
| 1347 | symbolS *symbolP; |
| 1348 | |
| 1349 | name = input_line_pointer; |
| 1350 | c = get_symbol_end (); |
| 1351 | /* just after name is now '\0' */ |
| 1352 | p = input_line_pointer; |
| 1353 | *p = c; |
| 1354 | SKIP_WHITESPACE (); |
| 1355 | |
| 1356 | if (*input_line_pointer != ',') |
| 1357 | { |
| 1358 | as_bad ("expected comma after symbol name"); |
| 1359 | ignore_rest_of_line (); |
| 1360 | return; |
| 1361 | } |
| 1362 | |
| 1363 | input_line_pointer++; /* skip ',' */ |
| 1364 | size = get_absolute_expression (); |
| 1365 | |
| 1366 | if (size < 0) |
| 1367 | { |
| 1368 | as_bad ("negative symbol length"); |
| 1369 | ignore_rest_of_line (); |
| 1370 | return; |
| 1371 | } |
| 1372 | |
| 1373 | *p = 0; |
| 1374 | symbolP = symbol_find_or_make (name); |
| 1375 | *p = c; |
| 1376 | |
| 1377 | if (S_IS_DEFINED (symbolP) && ! S_IS_COMMON (symbolP)) |
| 1378 | { |
| 1379 | as_bad ("ignoring attempt to re-define symbol"); |
| 1380 | ignore_rest_of_line (); |
| 1381 | return; |
| 1382 | } |
| 1383 | if (((int) S_GET_VALUE (symbolP) != 0) \ |
| 1384 | && ((int) S_GET_VALUE (symbolP) != size)) |
| 1385 | { |
| 1386 | as_warn ("length of symbol \"%s\" already %ld, ignoring %d", |
| 1387 | S_GET_NAME (symbolP), (long) S_GET_VALUE (symbolP), size); |
| 1388 | } |
| 1389 | assert (symbolP->sy_frag == &zero_address_frag); |
| 1390 | |
| 1391 | /* Now parse the alignment field. This field is optional for |
| 1392 | local and global symbols. Default alignment is zero. */ |
| 1393 | if (*input_line_pointer == ',') |
| 1394 | { |
| 1395 | input_line_pointer++; |
| 1396 | align = get_absolute_expression (); |
| 1397 | if (align < 0) |
| 1398 | { |
| 1399 | align = 0; |
| 1400 | as_warn ("assuming symbol alignment of zero"); |
| 1401 | } |
| 1402 | } |
| 1403 | else |
| 1404 | align = 0; |
| 1405 | |
| 1406 | if (localScope != 0) |
| 1407 | { |
| 1408 | segT old_sec; |
| 1409 | int old_subsec; |
| 1410 | char *pfrag; |
| 1411 | |
| 1412 | old_sec = now_seg; |
| 1413 | old_subsec = now_subseg; |
| 1414 | record_alignment (bss_section, align); |
| 1415 | subseg_set (bss_section, 0); /* ??? subseg_set (bss_section, 1); ??? */ |
| 1416 | |
| 1417 | if (align) |
| 1418 | /* Do alignment. */ |
| 1419 | frag_align (align, 0, 0); |
| 1420 | |
| 1421 | /* Detach from old frag. */ |
| 1422 | if (S_GET_SEGMENT (symbolP) == bss_section) |
| 1423 | symbolP->sy_frag->fr_symbol = NULL; |
| 1424 | |
| 1425 | symbolP->sy_frag = frag_now; |
| 1426 | pfrag = frag_var (rs_org, 1, 1, (relax_substateT) 0, symbolP, |
| 1427 | (offsetT) size, (char *) 0); |
| 1428 | *pfrag = 0; |
| 1429 | |
| 1430 | S_SET_SIZE (symbolP, size); |
| 1431 | S_SET_SEGMENT (symbolP, bss_section); |
| 1432 | S_CLEAR_EXTERNAL (symbolP); |
| 1433 | symbolP->local = 1; |
| 1434 | subseg_set (old_sec, old_subsec); |
| 1435 | } |
| 1436 | else |
| 1437 | { |
| 1438 | S_SET_VALUE (symbolP, (valueT) size); |
| 1439 | S_SET_ALIGN (symbolP, align); |
| 1440 | S_SET_EXTERNAL (symbolP); |
| 1441 | S_SET_SEGMENT (symbolP, bfd_com_section_ptr); |
| 1442 | } |
| 1443 | |
| 1444 | symbolP->bsym->flags |= BSF_OBJECT; |
| 1445 | |
| 1446 | demand_empty_rest_of_line (); |
| 1447 | } |
| 1448 | \f |
| 1449 | /* Select the cpu we're assembling for. */ |
| 1450 | |
| 1451 | static void |
| 1452 | arc_option (ignore) |
| 1453 | int ignore ATTRIBUTE_UNUSED; |
| 1454 | { |
| 1455 | int mach; |
| 1456 | char c; |
| 1457 | char *cpu; |
| 1458 | |
| 1459 | cpu = input_line_pointer; |
| 1460 | c = get_symbol_end (); |
| 1461 | mach = arc_get_mach (cpu); |
| 1462 | *input_line_pointer = c; |
| 1463 | |
| 1464 | /* If an instruction has already been seen, it's too late. */ |
| 1465 | if (cpu_tables_init_p) |
| 1466 | { |
| 1467 | as_bad ("\".option\" directive must appear before any instructions"); |
| 1468 | ignore_rest_of_line (); |
| 1469 | return; |
| 1470 | } |
| 1471 | |
| 1472 | if (mach == -1) |
| 1473 | goto bad_cpu; |
| 1474 | |
| 1475 | if (mach_type_specified_p && mach != arc_mach_type) |
| 1476 | { |
| 1477 | as_bad ("\".option\" directive conflicts with initial definition"); |
| 1478 | ignore_rest_of_line (); |
| 1479 | return; |
| 1480 | } |
| 1481 | else |
| 1482 | { |
| 1483 | /* The cpu may have been selected on the command line. */ |
| 1484 | if (mach != arc_mach_type) |
| 1485 | as_warn ("\".option\" directive overrides command-line (default) value"); |
| 1486 | arc_mach_type = mach; |
| 1487 | if (!bfd_set_arch_mach (stdoutput, bfd_arch_arc, mach)) |
| 1488 | as_fatal ("could not set architecture and machine"); |
| 1489 | mach_type_specified_p = 1; |
| 1490 | } |
| 1491 | demand_empty_rest_of_line (); |
| 1492 | return; |
| 1493 | |
| 1494 | bad_cpu: |
| 1495 | as_bad ("invalid identifier for \".option\""); |
| 1496 | ignore_rest_of_line (); |
| 1497 | } |
| 1498 | \f |
| 1499 | /* Turn a string in input_line_pointer into a floating point constant |
| 1500 | of type TYPE, and store the appropriate bytes in *LITP. The number |
| 1501 | of LITTLENUMS emitted is stored in *SIZEP. An error message is |
| 1502 | returned, or NULL on OK. */ |
| 1503 | |
| 1504 | /* Equal to MAX_PRECISION in atof-ieee.c */ |
| 1505 | #define MAX_LITTLENUMS 6 |
| 1506 | |
| 1507 | char * |
| 1508 | md_atof (type, litP, sizeP) |
| 1509 | int type; |
| 1510 | char *litP; |
| 1511 | int *sizeP; |
| 1512 | { |
| 1513 | int prec; |
| 1514 | LITTLENUM_TYPE words[MAX_LITTLENUMS]; |
| 1515 | LITTLENUM_TYPE *wordP; |
| 1516 | char *t; |
| 1517 | |
| 1518 | switch (type) |
| 1519 | { |
| 1520 | case 'f': |
| 1521 | case 'F': |
| 1522 | prec = 2; |
| 1523 | break; |
| 1524 | |
| 1525 | case 'd': |
| 1526 | case 'D': |
| 1527 | prec = 4; |
| 1528 | break; |
| 1529 | |
| 1530 | default: |
| 1531 | *sizeP = 0; |
| 1532 | return "bad call to md_atof"; |
| 1533 | } |
| 1534 | |
| 1535 | t = atof_ieee (input_line_pointer, type, words); |
| 1536 | if (t) |
| 1537 | input_line_pointer = t; |
| 1538 | *sizeP = prec * sizeof (LITTLENUM_TYPE); |
| 1539 | for (wordP = words; prec--;) |
| 1540 | { |
| 1541 | md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE)); |
| 1542 | litP += sizeof (LITTLENUM_TYPE); |
| 1543 | } |
| 1544 | |
| 1545 | return NULL; |
| 1546 | } |
| 1547 | |
| 1548 | /* Write a value out to the object file, using the appropriate |
| 1549 | endianness. */ |
| 1550 | |
| 1551 | void |
| 1552 | md_number_to_chars (buf, val, n) |
| 1553 | char *buf; |
| 1554 | valueT val; |
| 1555 | int n; |
| 1556 | { |
| 1557 | if (target_big_endian) |
| 1558 | number_to_chars_bigendian (buf, val, n); |
| 1559 | else |
| 1560 | number_to_chars_littleendian (buf, val, n); |
| 1561 | } |
| 1562 | |
| 1563 | /* Round up a section size to the appropriate boundary. */ |
| 1564 | |
| 1565 | valueT |
| 1566 | md_section_align (segment, size) |
| 1567 | segT segment; |
| 1568 | valueT size; |
| 1569 | { |
| 1570 | int align = bfd_get_section_alignment (stdoutput, segment); |
| 1571 | |
| 1572 | return ((size + (1 << align) - 1) & (-1 << align)); |
| 1573 | } |
| 1574 | |
| 1575 | /* We don't have any form of relaxing. */ |
| 1576 | |
| 1577 | int |
| 1578 | md_estimate_size_before_relax (fragp, seg) |
| 1579 | fragS *fragp ATTRIBUTE_UNUSED; |
| 1580 | asection *seg ATTRIBUTE_UNUSED; |
| 1581 | { |
| 1582 | as_fatal (_("md_estimate_size_before_relax\n")); |
| 1583 | return 1; |
| 1584 | } |
| 1585 | |
| 1586 | /* Convert a machine dependent frag. We never generate these. */ |
| 1587 | |
| 1588 | void |
| 1589 | md_convert_frag (abfd, sec, fragp) |
| 1590 | bfd *abfd ATTRIBUTE_UNUSED; |
| 1591 | asection *sec ATTRIBUTE_UNUSED; |
| 1592 | fragS *fragp ATTRIBUTE_UNUSED; |
| 1593 | { |
| 1594 | as_fatal (_("md_convert_frag\n")); |
| 1595 | } |
| 1596 | |
| 1597 | void |
| 1598 | arc_code_symbol (expressionP) |
| 1599 | expressionS *expressionP; |
| 1600 | { |
| 1601 | if (expressionP->X_op == O_symbol && expressionP->X_add_number == 0) |
| 1602 | { |
| 1603 | expressionS two; |
| 1604 | expressionP->X_op = O_right_shift; |
| 1605 | expressionP->X_add_symbol->sy_value.X_op = O_constant; |
| 1606 | two.X_op = O_constant; |
| 1607 | two.X_add_symbol = two.X_op_symbol = NULL; |
| 1608 | two.X_add_number = 2; |
| 1609 | expressionP->X_op_symbol = make_expr_symbol (&two); |
| 1610 | } |
| 1611 | /* Allow %st(sym1-sym2) */ |
| 1612 | else if (expressionP->X_op == O_subtract |
| 1613 | && expressionP->X_add_symbol != NULL |
| 1614 | && expressionP->X_op_symbol != NULL |
| 1615 | && expressionP->X_add_number == 0) |
| 1616 | { |
| 1617 | expressionS two; |
| 1618 | expressionP->X_add_symbol = make_expr_symbol (expressionP); |
| 1619 | expressionP->X_op = O_right_shift; |
| 1620 | two.X_op = O_constant; |
| 1621 | two.X_add_symbol = two.X_op_symbol = NULL; |
| 1622 | two.X_add_number = 2; |
| 1623 | expressionP->X_op_symbol = make_expr_symbol (&two); |
| 1624 | } |
| 1625 | else |
| 1626 | { |
| 1627 | as_bad ("expression too complex code symbol"); |
| 1628 | return; |
| 1629 | } |
| 1630 | } |
| 1631 | |
| 1632 | /* Parse an operand that is machine-specific. |
| 1633 | |
| 1634 | The ARC has a special %-op to adjust addresses so they're usable in |
| 1635 | branches. The "st" is short for the STatus register. |
| 1636 | ??? Later expand this to take a flags value too. |
| 1637 | |
| 1638 | ??? We can't create new expression types so we map the %-op's onto the |
| 1639 | existing syntax. This means that the user could use the chosen syntax |
| 1640 | to achieve the same effect. */ |
| 1641 | |
| 1642 | void |
| 1643 | md_operand (expressionP) |
| 1644 | expressionS *expressionP; |
| 1645 | { |
| 1646 | char *p = input_line_pointer; |
| 1647 | |
| 1648 | if (*p != '%') |
| 1649 | return; |
| 1650 | |
| 1651 | if (strncmp (p, "%st(", 4) == 0) |
| 1652 | { |
| 1653 | input_line_pointer += 4; |
| 1654 | expression (expressionP); |
| 1655 | if (*input_line_pointer != ')') |
| 1656 | { |
| 1657 | as_bad ("missing ')' in %%-op"); |
| 1658 | return; |
| 1659 | } |
| 1660 | ++input_line_pointer; |
| 1661 | arc_code_symbol (expressionP); |
| 1662 | } |
| 1663 | else |
| 1664 | { |
| 1665 | /* It could be a register. */ |
| 1666 | int i, l; |
| 1667 | struct arc_ext_operand_value *ext_oper = arc_ext_operands; |
| 1668 | p++; |
| 1669 | |
| 1670 | while (ext_oper) |
| 1671 | { |
| 1672 | l = strlen (ext_oper->operand.name); |
| 1673 | if (!strncmp (p, ext_oper->operand.name, l) && !ISALNUM (*(p + l))) |
| 1674 | { |
| 1675 | input_line_pointer += l + 1; |
| 1676 | expressionP->X_op = O_register; |
| 1677 | expressionP->X_add_number = (int) &ext_oper->operand; |
| 1678 | return; |
| 1679 | } |
| 1680 | ext_oper = ext_oper->next; |
| 1681 | } |
| 1682 | for (i = 0; i < arc_reg_names_count; i++) |
| 1683 | { |
| 1684 | l = strlen (arc_reg_names[i].name); |
| 1685 | if (!strncmp (p, arc_reg_names[i].name, l) && !ISALNUM (*(p + l))) |
| 1686 | { |
| 1687 | input_line_pointer += l + 1; |
| 1688 | expressionP->X_op = O_register; |
| 1689 | expressionP->X_add_number = (int) &arc_reg_names[i]; |
| 1690 | break; |
| 1691 | } |
| 1692 | } |
| 1693 | } |
| 1694 | } |
| 1695 | |
| 1696 | /* We have no need to default values of symbols. |
| 1697 | We could catch register names here, but that is handled by inserting |
| 1698 | them all in the symbol table to begin with. */ |
| 1699 | |
| 1700 | symbolS * |
| 1701 | md_undefined_symbol (name) |
| 1702 | char *name ATTRIBUTE_UNUSED; |
| 1703 | { |
| 1704 | return 0; |
| 1705 | } |
| 1706 | \f |
| 1707 | /* Functions concerning expressions. */ |
| 1708 | |
| 1709 | /* Parse a .byte, .word, etc. expression. |
| 1710 | |
| 1711 | Values for the status register are specified with %st(label). |
| 1712 | `label' will be right shifted by 2. */ |
| 1713 | |
| 1714 | void |
| 1715 | arc_parse_cons_expression (exp, nbytes) |
| 1716 | expressionS *exp; |
| 1717 | unsigned int nbytes ATTRIBUTE_UNUSED; |
| 1718 | { |
| 1719 | char *p = input_line_pointer; |
| 1720 | int code_symbol_fix = 0; |
| 1721 | |
| 1722 | for (; ! is_end_of_line[(unsigned char) *p]; p++) |
| 1723 | if (*p == '@' && !strncmp (p, "@h30", 4)) |
| 1724 | { |
| 1725 | code_symbol_fix = 1; |
| 1726 | strcpy (p, "; "); |
| 1727 | } |
| 1728 | expr (0, exp); |
| 1729 | if (code_symbol_fix) |
| 1730 | { |
| 1731 | arc_code_symbol (exp); |
| 1732 | input_line_pointer = p; |
| 1733 | } |
| 1734 | } |
| 1735 | |
| 1736 | /* Record a fixup for a cons expression. */ |
| 1737 | |
| 1738 | void |
| 1739 | arc_cons_fix_new (frag, where, nbytes, exp) |
| 1740 | fragS *frag; |
| 1741 | int where; |
| 1742 | int nbytes; |
| 1743 | expressionS *exp; |
| 1744 | { |
| 1745 | if (nbytes == 4) |
| 1746 | { |
| 1747 | int reloc_type; |
| 1748 | expressionS exptmp; |
| 1749 | |
| 1750 | /* This may be a special ARC reloc (eg: %st()). */ |
| 1751 | reloc_type = get_arc_exp_reloc_type (1, BFD_RELOC_32, exp, &exptmp); |
| 1752 | fix_new_exp (frag, where, nbytes, &exptmp, 0, reloc_type); |
| 1753 | } |
| 1754 | else |
| 1755 | { |
| 1756 | fix_new_exp (frag, where, nbytes, exp, 0, |
| 1757 | nbytes == 2 ? BFD_RELOC_16 |
| 1758 | : nbytes == 8 ? BFD_RELOC_64 |
| 1759 | : BFD_RELOC_32); |
| 1760 | } |
| 1761 | } |
| 1762 | \f |
| 1763 | /* Functions concerning relocs. */ |
| 1764 | |
| 1765 | /* The location from which a PC relative jump should be calculated, |
| 1766 | given a PC relative reloc. */ |
| 1767 | |
| 1768 | long |
| 1769 | md_pcrel_from (fixP) |
| 1770 | fixS *fixP; |
| 1771 | { |
| 1772 | /* Return the address of the delay slot. */ |
| 1773 | return fixP->fx_frag->fr_address + fixP->fx_where + fixP->fx_size; |
| 1774 | } |
| 1775 | |
| 1776 | /* Compute the reloc type of an expression. |
| 1777 | The possibly modified expression is stored in EXPNEW. |
| 1778 | |
| 1779 | This is used to convert the expressions generated by the %-op's into |
| 1780 | the appropriate operand type. It is called for both data in instructions |
| 1781 | (operands) and data outside instructions (variables, debugging info, etc.). |
| 1782 | |
| 1783 | Currently supported %-ops: |
| 1784 | |
| 1785 | %st(symbol): represented as "symbol >> 2" |
| 1786 | "st" is short for STatus as in the status register (pc) |
| 1787 | |
| 1788 | DEFAULT_TYPE is the type to use if no special processing is required. |
| 1789 | |
| 1790 | DATA_P is non-zero for data or limm values, zero for insn operands. |
| 1791 | Remember that the opcode "insertion fns" cannot be used on data, they're |
| 1792 | only for inserting operands into insns. They also can't be used for limm |
| 1793 | values as the insertion routines don't handle limm values. When called for |
| 1794 | insns we return fudged reloc types (real_value - BFD_RELOC_UNUSED). When |
| 1795 | called for data or limm values we use real reloc types. */ |
| 1796 | |
| 1797 | static int |
| 1798 | get_arc_exp_reloc_type (data_p, default_type, exp, expnew) |
| 1799 | int data_p; |
| 1800 | int default_type; |
| 1801 | expressionS *exp; |
| 1802 | expressionS *expnew; |
| 1803 | { |
| 1804 | /* If the expression is "symbol >> 2" we must change it to just "symbol", |
| 1805 | as fix_new_exp can't handle it. Similarly for (symbol - symbol) >> 2. |
| 1806 | That's ok though. What's really going on here is that we're using |
| 1807 | ">> 2" as a special syntax for specifying BFD_RELOC_ARC_B26. */ |
| 1808 | |
| 1809 | if (exp->X_op == O_right_shift |
| 1810 | && exp->X_op_symbol != NULL |
| 1811 | && exp->X_op_symbol->sy_value.X_op == O_constant |
| 1812 | && exp->X_op_symbol->sy_value.X_add_number == 2 |
| 1813 | && exp->X_add_number == 0) |
| 1814 | { |
| 1815 | if (exp->X_add_symbol != NULL |
| 1816 | && (exp->X_add_symbol->sy_value.X_op == O_constant |
| 1817 | || exp->X_add_symbol->sy_value.X_op == O_symbol)) |
| 1818 | { |
| 1819 | *expnew = *exp; |
| 1820 | expnew->X_op = O_symbol; |
| 1821 | expnew->X_op_symbol = NULL; |
| 1822 | return data_p ? BFD_RELOC_ARC_B26 : arc_operand_map['J']; |
| 1823 | } |
| 1824 | else if (exp->X_add_symbol != NULL |
| 1825 | && exp->X_add_symbol->sy_value.X_op == O_subtract) |
| 1826 | { |
| 1827 | *expnew = exp->X_add_symbol->sy_value; |
| 1828 | return data_p ? BFD_RELOC_ARC_B26 : arc_operand_map['J']; |
| 1829 | } |
| 1830 | } |
| 1831 | |
| 1832 | *expnew = *exp; |
| 1833 | return default_type; |
| 1834 | } |
| 1835 | |
| 1836 | /* Apply a fixup to the object code. This is called for all the |
| 1837 | fixups we generated by the call to fix_new_exp, above. In the call |
| 1838 | above we used a reloc code which was the largest legal reloc code |
| 1839 | plus the operand index. Here we undo that to recover the operand |
| 1840 | index. At this point all symbol values should be fully resolved, |
| 1841 | and we attempt to completely resolve the reloc. If we can not do |
| 1842 | that, we determine the correct reloc code and put it back in the fixup. */ |
| 1843 | |
| 1844 | void |
| 1845 | md_apply_fix3 (fixP, valP, seg) |
| 1846 | fixS *fixP; |
| 1847 | valueT * valP; |
| 1848 | segT seg; |
| 1849 | { |
| 1850 | valueT value = * valP; |
| 1851 | |
| 1852 | if (fixP->fx_addsy == (symbolS *) NULL) |
| 1853 | fixP->fx_done = 1; |
| 1854 | |
| 1855 | else if (fixP->fx_pcrel) |
| 1856 | { |
| 1857 | /* Hack around bfd_install_relocation brain damage. */ |
| 1858 | if (S_GET_SEGMENT (fixP->fx_addsy) != seg) |
| 1859 | value += md_pcrel_from (fixP); |
| 1860 | } |
| 1861 | |
| 1862 | /* We can't actually support subtracting a symbol. */ |
| 1863 | if (fixP->fx_subsy != NULL) |
| 1864 | as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex")); |
| 1865 | |
| 1866 | if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED) |
| 1867 | { |
| 1868 | int opindex; |
| 1869 | const struct arc_operand *operand; |
| 1870 | char *where; |
| 1871 | arc_insn insn; |
| 1872 | |
| 1873 | opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED; |
| 1874 | |
| 1875 | operand = &arc_operands[opindex]; |
| 1876 | |
| 1877 | /* Fetch the instruction, insert the fully resolved operand |
| 1878 | value, and stuff the instruction back again. */ |
| 1879 | where = fixP->fx_frag->fr_literal + fixP->fx_where; |
| 1880 | if (target_big_endian) |
| 1881 | insn = bfd_getb32 ((unsigned char *) where); |
| 1882 | else |
| 1883 | insn = bfd_getl32 ((unsigned char *) where); |
| 1884 | insn = arc_insert_operand (insn, operand, -1, NULL, (offsetT) value, |
| 1885 | fixP->fx_file, fixP->fx_line); |
| 1886 | if (target_big_endian) |
| 1887 | bfd_putb32 ((bfd_vma) insn, (unsigned char *) where); |
| 1888 | else |
| 1889 | bfd_putl32 ((bfd_vma) insn, (unsigned char *) where); |
| 1890 | |
| 1891 | if (fixP->fx_done) |
| 1892 | { |
| 1893 | /* Nothing else to do here. */ |
| 1894 | return; |
| 1895 | } |
| 1896 | |
| 1897 | /* Determine a BFD reloc value based on the operand information. |
| 1898 | We are only prepared to turn a few of the operands into relocs. |
| 1899 | !!! Note that we can't handle limm values here. Since we're using |
| 1900 | implicit addends the addend must be inserted into the instruction, |
| 1901 | however, the opcode insertion routines currently do nothing with |
| 1902 | limm values. */ |
| 1903 | if (operand->fmt == 'B') |
| 1904 | { |
| 1905 | assert ((operand->flags & ARC_OPERAND_RELATIVE_BRANCH) != 0 |
| 1906 | && operand->bits == 20 |
| 1907 | && operand->shift == 7); |
| 1908 | fixP->fx_r_type = BFD_RELOC_ARC_B22_PCREL; |
| 1909 | } |
| 1910 | else if (operand->fmt == 'J') |
| 1911 | { |
| 1912 | assert ((operand->flags & ARC_OPERAND_ABSOLUTE_BRANCH) != 0 |
| 1913 | && operand->bits == 24 |
| 1914 | && operand->shift == 32); |
| 1915 | fixP->fx_r_type = BFD_RELOC_ARC_B26; |
| 1916 | } |
| 1917 | else if (operand->fmt == 'L') |
| 1918 | { |
| 1919 | assert ((operand->flags & ARC_OPERAND_LIMM) != 0 |
| 1920 | && operand->bits == 32 |
| 1921 | && operand->shift == 32); |
| 1922 | fixP->fx_r_type = BFD_RELOC_32; |
| 1923 | } |
| 1924 | else |
| 1925 | { |
| 1926 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1927 | "unresolved expression that must be resolved"); |
| 1928 | fixP->fx_done = 1; |
| 1929 | return; |
| 1930 | } |
| 1931 | } |
| 1932 | else |
| 1933 | { |
| 1934 | switch (fixP->fx_r_type) |
| 1935 | { |
| 1936 | case BFD_RELOC_8: |
| 1937 | md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, |
| 1938 | value, 1); |
| 1939 | break; |
| 1940 | case BFD_RELOC_16: |
| 1941 | md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, |
| 1942 | value, 2); |
| 1943 | break; |
| 1944 | case BFD_RELOC_32: |
| 1945 | md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, |
| 1946 | value, 4); |
| 1947 | break; |
| 1948 | case BFD_RELOC_ARC_B26: |
| 1949 | /* If !fixP->fx_done then `value' is an implicit addend. |
| 1950 | We must shift it right by 2 in this case as well because the |
| 1951 | linker performs the relocation and then adds this in (as opposed |
| 1952 | to adding this in and then shifting right by 2). */ |
| 1953 | value >>= 2; |
| 1954 | md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, |
| 1955 | value, 4); |
| 1956 | break; |
| 1957 | default: |
| 1958 | abort (); |
| 1959 | } |
| 1960 | } |
| 1961 | } |
| 1962 | |
| 1963 | /* Translate internal representation of relocation info to BFD target |
| 1964 | format. */ |
| 1965 | |
| 1966 | arelent * |
| 1967 | tc_gen_reloc (section, fixP) |
| 1968 | asection *section ATTRIBUTE_UNUSED; |
| 1969 | fixS *fixP; |
| 1970 | { |
| 1971 | arelent *reloc; |
| 1972 | |
| 1973 | reloc = (arelent *) xmalloc (sizeof (arelent)); |
| 1974 | reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); |
| 1975 | |
| 1976 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); |
| 1977 | reloc->address = fixP->fx_frag->fr_address + fixP->fx_where; |
| 1978 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); |
| 1979 | if (reloc->howto == (reloc_howto_type *) NULL) |
| 1980 | { |
| 1981 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1982 | "internal error: can't export reloc type %d (`%s')", |
| 1983 | fixP->fx_r_type, |
| 1984 | bfd_get_reloc_code_name (fixP->fx_r_type)); |
| 1985 | return NULL; |
| 1986 | } |
| 1987 | |
| 1988 | assert (!fixP->fx_pcrel == !reloc->howto->pc_relative); |
| 1989 | |
| 1990 | /* Set addend to account for PC being advanced one insn before the |
| 1991 | target address is computed. */ |
| 1992 | |
| 1993 | reloc->addend = (fixP->fx_pcrel ? -4 : 0); |
| 1994 | |
| 1995 | return reloc; |
| 1996 | } |