| 1 | /* Altera Nios II assembler. |
| 2 | Copyright (C) 2012, 2013 Free Software Foundation, Inc. |
| 3 | Contributed by Nigel Gray (ngray@altera.com). |
| 4 | Contributed by Mentor Graphics, Inc. |
| 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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA |
| 21 | 02110-1301, USA. */ |
| 22 | |
| 23 | #include "as.h" |
| 24 | #include "opcode/nios2.h" |
| 25 | #include "elf/nios2.h" |
| 26 | #include "tc-nios2.h" |
| 27 | #include "bfd.h" |
| 28 | #include "dwarf2dbg.h" |
| 29 | #include "subsegs.h" |
| 30 | #include "safe-ctype.h" |
| 31 | #include "dw2gencfi.h" |
| 32 | |
| 33 | #ifndef OBJ_ELF |
| 34 | /* We are not supporting any other target so we throw a compile time error. */ |
| 35 | OBJ_ELF not defined |
| 36 | #endif |
| 37 | |
| 38 | /* We can choose our endianness at run-time, regardless of configuration. */ |
| 39 | extern int target_big_endian; |
| 40 | |
| 41 | /* This array holds the chars that always start a comment. If the |
| 42 | pre-processor is disabled, these aren't very useful. */ |
| 43 | const char comment_chars[] = "#"; |
| 44 | |
| 45 | /* This array holds the chars that only start a comment at the beginning of |
| 46 | a line. If the line seems to have the form '# 123 filename' |
| 47 | .line and .file directives will appear in the pre-processed output. */ |
| 48 | /* Note that input_file.c hand checks for '#' at the beginning of the |
| 49 | first line of the input file. This is because the compiler outputs |
| 50 | #NO_APP at the beginning of its output. */ |
| 51 | /* Also note that C style comments are always supported. */ |
| 52 | const char line_comment_chars[] = "#"; |
| 53 | |
| 54 | /* This array holds machine specific line separator characters. */ |
| 55 | const char line_separator_chars[] = ";"; |
| 56 | |
| 57 | /* Chars that can be used to separate mant from exp in floating point nums. */ |
| 58 | const char EXP_CHARS[] = "eE"; |
| 59 | |
| 60 | /* Chars that mean this number is a floating point constant. */ |
| 61 | /* As in 0f12.456 */ |
| 62 | /* or 0d1.2345e12 */ |
| 63 | const char FLT_CHARS[] = "rRsSfFdDxXpP"; |
| 64 | |
| 65 | /* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be |
| 66 | changed in read.c. Ideally it shouldn't have to know about it at all, |
| 67 | but nothing is ideal around here. */ |
| 68 | |
| 69 | /* Machine-dependent command-line options. */ |
| 70 | |
| 71 | const char *md_shortopts = "r"; |
| 72 | |
| 73 | struct option md_longopts[] = { |
| 74 | #define OPTION_RELAX_ALL (OPTION_MD_BASE + 0) |
| 75 | {"relax-all", no_argument, NULL, OPTION_RELAX_ALL}, |
| 76 | #define OPTION_NORELAX (OPTION_MD_BASE + 1) |
| 77 | {"no-relax", no_argument, NULL, OPTION_NORELAX}, |
| 78 | #define OPTION_RELAX_SECTION (OPTION_MD_BASE + 2) |
| 79 | {"relax-section", no_argument, NULL, OPTION_RELAX_SECTION}, |
| 80 | #define OPTION_EB (OPTION_MD_BASE + 3) |
| 81 | {"EB", no_argument, NULL, OPTION_EB}, |
| 82 | #define OPTION_EL (OPTION_MD_BASE + 4) |
| 83 | {"EL", no_argument, NULL, OPTION_EL} |
| 84 | }; |
| 85 | |
| 86 | size_t md_longopts_size = sizeof (md_longopts); |
| 87 | |
| 88 | /* The assembler supports three different relaxation modes, controlled by |
| 89 | command-line options. */ |
| 90 | typedef enum |
| 91 | { |
| 92 | relax_section = 0, |
| 93 | relax_none, |
| 94 | relax_all |
| 95 | } relax_optionT; |
| 96 | |
| 97 | /* Struct contains all assembler options set with .set. */ |
| 98 | struct |
| 99 | { |
| 100 | /* .set noat -> noat = 1 allows assembly code to use at without warning |
| 101 | and macro expansions generate a warning. |
| 102 | .set at -> noat = 0, assembly code using at warn but macro expansions |
| 103 | do not generate warnings. */ |
| 104 | bfd_boolean noat; |
| 105 | |
| 106 | /* .set nobreak -> nobreak = 1 allows assembly code to use ba,bt without |
| 107 | warning. |
| 108 | .set break -> nobreak = 0, assembly code using ba,bt warns. */ |
| 109 | bfd_boolean nobreak; |
| 110 | |
| 111 | /* .cmd line option -relax-all allows all branches and calls to be replaced |
| 112 | with longer versions. |
| 113 | -no-relax inhibits branch/call conversion. |
| 114 | The default value is relax_section, which relaxes branches within |
| 115 | a section. */ |
| 116 | relax_optionT relax; |
| 117 | |
| 118 | } nios2_as_options = {FALSE, FALSE, relax_section}; |
| 119 | |
| 120 | |
| 121 | typedef struct nios2_insn_reloc |
| 122 | { |
| 123 | /* Any expression in the instruction is parsed into this field, |
| 124 | which is passed to fix_new_exp() to generate a fixup. */ |
| 125 | expressionS reloc_expression; |
| 126 | |
| 127 | /* The type of the relocation to be applied. */ |
| 128 | bfd_reloc_code_real_type reloc_type; |
| 129 | |
| 130 | /* PC-relative. */ |
| 131 | unsigned int reloc_pcrel; |
| 132 | |
| 133 | /* The next relocation to be applied to the instruction. */ |
| 134 | struct nios2_insn_reloc *reloc_next; |
| 135 | } nios2_insn_relocS; |
| 136 | |
| 137 | /* This struct is used to hold state when assembling instructions. */ |
| 138 | typedef struct nios2_insn_info |
| 139 | { |
| 140 | /* Assembled instruction. */ |
| 141 | unsigned long insn_code; |
| 142 | /* Pointer to the relevant bit of the opcode table. */ |
| 143 | const struct nios2_opcode *insn_nios2_opcode; |
| 144 | /* After parsing ptrs to the tokens in the instruction fill this array |
| 145 | it is terminated with a null pointer (hence the first +1). |
| 146 | The second +1 is because in some parts of the code the opcode |
| 147 | is not counted as a token, but still placed in this array. */ |
| 148 | const char *insn_tokens[NIOS2_MAX_INSN_TOKENS + 1 + 1]; |
| 149 | |
| 150 | /* This holds information used to generate fixups |
| 151 | and eventually relocations if it is not null. */ |
| 152 | nios2_insn_relocS *insn_reloc; |
| 153 | } nios2_insn_infoS; |
| 154 | |
| 155 | /* This struct associates an argument assemble function with |
| 156 | an argument syntax string. Used by the assembler to find out |
| 157 | how to parse and assemble a set of instruction operands and |
| 158 | return the instruction field values. */ |
| 159 | typedef struct nios2_arg_info |
| 160 | { |
| 161 | const char *args; |
| 162 | void (*assemble_args_func) (nios2_insn_infoS *insn_info); |
| 163 | } nios2_arg_infoS; |
| 164 | |
| 165 | /* This struct is used to convert Nios II pseudo-ops into the |
| 166 | corresponding real op. */ |
| 167 | typedef struct nios2_ps_insn_info |
| 168 | { |
| 169 | /* Map this pseudo_op... */ |
| 170 | const char *pseudo_insn; |
| 171 | |
| 172 | /* ...to this real instruction. */ |
| 173 | const char *insn; |
| 174 | |
| 175 | /* Call this function to modify the operands.... */ |
| 176 | void (*arg_modifer_func) (char ** parsed_args, const char *arg, int num, |
| 177 | int start); |
| 178 | |
| 179 | /* ...with these arguments. */ |
| 180 | const char *arg_modifier; |
| 181 | int num; |
| 182 | int index; |
| 183 | |
| 184 | /* If arg_modifier_func allocates new memory, provide this function |
| 185 | to free it afterwards. */ |
| 186 | void (*arg_cleanup_func) (char **parsed_args, int num, int start); |
| 187 | } nios2_ps_insn_infoS; |
| 188 | |
| 189 | /* Opcode hash table. */ |
| 190 | static struct hash_control *nios2_opcode_hash = NULL; |
| 191 | #define nios2_opcode_lookup(NAME) \ |
| 192 | ((struct nios2_opcode *) hash_find (nios2_opcode_hash, (NAME))) |
| 193 | |
| 194 | /* Register hash table. */ |
| 195 | static struct hash_control *nios2_reg_hash = NULL; |
| 196 | #define nios2_reg_lookup(NAME) \ |
| 197 | ((struct nios2_reg *) hash_find (nios2_reg_hash, (NAME))) |
| 198 | |
| 199 | /* Parse args hash table. */ |
| 200 | static struct hash_control *nios2_arg_hash = NULL; |
| 201 | #define nios2_arg_lookup(NAME) \ |
| 202 | ((nios2_arg_infoS *) hash_find (nios2_arg_hash, (NAME))) |
| 203 | |
| 204 | /* Pseudo-op hash table. */ |
| 205 | static struct hash_control *nios2_ps_hash = NULL; |
| 206 | #define nios2_ps_lookup(NAME) \ |
| 207 | ((nios2_ps_insn_infoS *) hash_find (nios2_ps_hash, (NAME))) |
| 208 | |
| 209 | /* The known current alignment of the current section. */ |
| 210 | static int nios2_current_align; |
| 211 | static segT nios2_current_align_seg; |
| 212 | |
| 213 | static int nios2_auto_align_on = 1; |
| 214 | |
| 215 | /* The last seen label in the current section. This is used to auto-align |
| 216 | labels preceeding instructions. */ |
| 217 | static symbolS *nios2_last_label; |
| 218 | |
| 219 | #ifdef OBJ_ELF |
| 220 | /* Pre-defined "_GLOBAL_OFFSET_TABLE_" */ |
| 221 | symbolS *GOT_symbol; |
| 222 | #endif |
| 223 | |
| 224 | \f |
| 225 | /** Utility routines. */ |
| 226 | /* Function md_chars_to_number takes the sequence of |
| 227 | bytes in buf and returns the corresponding value |
| 228 | in an int. n must be 1, 2 or 4. */ |
| 229 | static valueT |
| 230 | md_chars_to_number (char *buf, int n) |
| 231 | { |
| 232 | int i; |
| 233 | valueT val; |
| 234 | |
| 235 | gas_assert (n == 1 || n == 2 || n == 4); |
| 236 | |
| 237 | val = 0; |
| 238 | if (target_big_endian) |
| 239 | for (i = 0; i < n; ++i) |
| 240 | val = val | ((buf[i] & 0xff) << 8 * (n - (i + 1))); |
| 241 | else |
| 242 | for (i = 0; i < n; ++i) |
| 243 | val = val | ((buf[i] & 0xff) << 8 * i); |
| 244 | return val; |
| 245 | } |
| 246 | |
| 247 | |
| 248 | /* This function turns a C long int, short int or char |
| 249 | into the series of bytes that represent the number |
| 250 | on the target machine. */ |
| 251 | void |
| 252 | md_number_to_chars (char *buf, valueT val, int n) |
| 253 | { |
| 254 | gas_assert (n == 1 || n == 2 || n == 4 || n == 8); |
| 255 | if (target_big_endian) |
| 256 | number_to_chars_bigendian (buf, val, n); |
| 257 | else |
| 258 | number_to_chars_littleendian (buf, val, n); |
| 259 | } |
| 260 | |
| 261 | /* Turn a string in input_line_pointer into a floating point constant |
| 262 | of type TYPE, and store the appropriate bytes in *LITP. The number |
| 263 | of LITTLENUMS emitted is stored in *SIZEP. An error message is |
| 264 | returned, or NULL on OK. */ |
| 265 | char * |
| 266 | md_atof (int type, char *litP, int *sizeP) |
| 267 | { |
| 268 | int prec; |
| 269 | LITTLENUM_TYPE words[4]; |
| 270 | char *t; |
| 271 | int i; |
| 272 | |
| 273 | switch (type) |
| 274 | { |
| 275 | case 'f': |
| 276 | prec = 2; |
| 277 | break; |
| 278 | case 'd': |
| 279 | prec = 4; |
| 280 | break; |
| 281 | default: |
| 282 | *sizeP = 0; |
| 283 | return _("bad call to md_atof"); |
| 284 | } |
| 285 | |
| 286 | t = atof_ieee (input_line_pointer, type, words); |
| 287 | if (t) |
| 288 | input_line_pointer = t; |
| 289 | |
| 290 | *sizeP = prec * 2; |
| 291 | |
| 292 | if (! target_big_endian) |
| 293 | for (i = prec - 1; i >= 0; i--, litP += 2) |
| 294 | md_number_to_chars (litP, (valueT) words[i], 2); |
| 295 | else |
| 296 | for (i = 0; i < prec; i++, litP += 2) |
| 297 | md_number_to_chars (litP, (valueT) words[i], 2); |
| 298 | |
| 299 | return NULL; |
| 300 | } |
| 301 | |
| 302 | /* Return true if STR starts with PREFIX, which should be a string literal. */ |
| 303 | #define strprefix(STR, PREFIX) \ |
| 304 | (strncmp ((STR), PREFIX, strlen (PREFIX)) == 0) |
| 305 | |
| 306 | /* Return true if STR is prefixed with a control register name. */ |
| 307 | static int |
| 308 | nios2_control_register_arg_p (const char *str) |
| 309 | { |
| 310 | return (strprefix (str, "ctl") |
| 311 | || strprefix (str, "cpuid") |
| 312 | || strprefix (str, "status") |
| 313 | || strprefix (str, "estatus") |
| 314 | || strprefix (str, "bstatus") |
| 315 | || strprefix (str, "ienable") |
| 316 | || strprefix (str, "ipending") |
| 317 | || strprefix (str, "exception") |
| 318 | || strprefix (str, "pteaddr") |
| 319 | || strprefix (str, "tlbacc") |
| 320 | || strprefix (str, "tlbmisc") |
| 321 | || strprefix (str, "fstatus") |
| 322 | || strprefix (str, "config") |
| 323 | || strprefix (str, "mpubase") |
| 324 | || strprefix (str, "mpuacc") |
| 325 | || strprefix (str, "badaddr")); |
| 326 | } |
| 327 | |
| 328 | /* Return true if STR is prefixed with a special relocation operator. */ |
| 329 | static int |
| 330 | nios2_special_relocation_p (const char *str) |
| 331 | { |
| 332 | return (strprefix (str, "%lo") |
| 333 | || strprefix (str, "%hi") |
| 334 | || strprefix (str, "%hiadj") |
| 335 | || strprefix (str, "%gprel") |
| 336 | || strprefix (str, "%got") |
| 337 | || strprefix (str, "%call") |
| 338 | || strprefix (str, "%gotoff_lo") |
| 339 | || strprefix (str, "%gotoff_hiadj") |
| 340 | || strprefix (str, "%tls_gd") |
| 341 | || strprefix (str, "%tls_ldm") |
| 342 | || strprefix (str, "%tls_ldo") |
| 343 | || strprefix (str, "%tls_ie") |
| 344 | || strprefix (str, "%tls_le") |
| 345 | || strprefix (str, "%gotoff")); |
| 346 | } |
| 347 | |
| 348 | /* Checks whether the register name is a coprocessor |
| 349 | register - returns TRUE if it is, FALSE otherwise. */ |
| 350 | static bfd_boolean |
| 351 | nios2_coproc_reg (const char *reg_name) |
| 352 | { |
| 353 | gas_assert (reg_name != NULL); |
| 354 | |
| 355 | /* Check that we do have a valid register name and that it is a |
| 356 | coprocessor register. |
| 357 | It must begin with c, not be a control register, and be a valid |
| 358 | register name. */ |
| 359 | if (strprefix (reg_name, "c") |
| 360 | && !strprefix (reg_name, "ctl") |
| 361 | && hash_find (nios2_reg_hash, reg_name) != NULL) |
| 362 | return TRUE; |
| 363 | else |
| 364 | return FALSE; |
| 365 | } |
| 366 | |
| 367 | /* nop fill pattern for text section. */ |
| 368 | static char const nop[4] = { 0x3a, 0x88, 0x01, 0x00 }; |
| 369 | |
| 370 | /* Handles all machine-dependent alignment needs. */ |
| 371 | static void |
| 372 | nios2_align (int log_size, const char *pfill, symbolS *label) |
| 373 | { |
| 374 | int align; |
| 375 | long max_alignment = 15; |
| 376 | |
| 377 | /* The front end is prone to changing segments out from under us |
| 378 | temporarily when -g is in effect. */ |
| 379 | int switched_seg_p = (nios2_current_align_seg != now_seg); |
| 380 | |
| 381 | align = log_size; |
| 382 | if (align > max_alignment) |
| 383 | { |
| 384 | align = max_alignment; |
| 385 | as_bad (_("Alignment too large: %d. assumed"), align); |
| 386 | } |
| 387 | else if (align < 0) |
| 388 | { |
| 389 | as_warn (_("Alignment negative: 0 assumed")); |
| 390 | align = 0; |
| 391 | } |
| 392 | |
| 393 | if (align != 0) |
| 394 | { |
| 395 | if (subseg_text_p (now_seg) && align >= 2) |
| 396 | { |
| 397 | /* First, make sure we're on a four-byte boundary, in case |
| 398 | someone has been putting .byte values the text section. */ |
| 399 | if (nios2_current_align < 2 || switched_seg_p) |
| 400 | frag_align (2, 0, 0); |
| 401 | |
| 402 | /* Now fill in the alignment pattern. */ |
| 403 | if (pfill != NULL) |
| 404 | frag_align_pattern (align, pfill, sizeof nop, 0); |
| 405 | else |
| 406 | frag_align (align, 0, 0); |
| 407 | } |
| 408 | else |
| 409 | frag_align (align, 0, 0); |
| 410 | |
| 411 | if (!switched_seg_p) |
| 412 | nios2_current_align = align; |
| 413 | |
| 414 | /* If the last label was in a different section we can't align it. */ |
| 415 | if (label != NULL && !switched_seg_p) |
| 416 | { |
| 417 | symbolS *sym; |
| 418 | int label_seen = FALSE; |
| 419 | struct frag *old_frag; |
| 420 | valueT old_value; |
| 421 | valueT new_value; |
| 422 | |
| 423 | gas_assert (S_GET_SEGMENT (label) == now_seg); |
| 424 | |
| 425 | old_frag = symbol_get_frag (label); |
| 426 | old_value = S_GET_VALUE (label); |
| 427 | new_value = (valueT) frag_now_fix (); |
| 428 | |
| 429 | /* It is possible to have more than one label at a particular |
| 430 | address, especially if debugging is enabled, so we must |
| 431 | take care to adjust all the labels at this address in this |
| 432 | fragment. To save time we search from the end of the symbol |
| 433 | list, backwards, since the symbols we are interested in are |
| 434 | almost certainly the ones that were most recently added. |
| 435 | Also to save time we stop searching once we have seen at least |
| 436 | one matching label, and we encounter a label that is no longer |
| 437 | in the target fragment. Note, this search is guaranteed to |
| 438 | find at least one match when sym == label, so no special case |
| 439 | code is necessary. */ |
| 440 | for (sym = symbol_lastP; sym != NULL; sym = symbol_previous (sym)) |
| 441 | if (symbol_get_frag (sym) == old_frag |
| 442 | && S_GET_VALUE (sym) == old_value) |
| 443 | { |
| 444 | label_seen = TRUE; |
| 445 | symbol_set_frag (sym, frag_now); |
| 446 | S_SET_VALUE (sym, new_value); |
| 447 | } |
| 448 | else if (label_seen && symbol_get_frag (sym) != old_frag) |
| 449 | break; |
| 450 | } |
| 451 | record_alignment (now_seg, align); |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | \f |
| 456 | /** Support for self-check mode. */ |
| 457 | |
| 458 | /* Mode of the assembler. */ |
| 459 | typedef enum |
| 460 | { |
| 461 | NIOS2_MODE_ASSEMBLE, /* Ordinary operation. */ |
| 462 | NIOS2_MODE_TEST /* Hidden mode used for self testing. */ |
| 463 | } NIOS2_MODE; |
| 464 | |
| 465 | static NIOS2_MODE nios2_mode = NIOS2_MODE_ASSEMBLE; |
| 466 | |
| 467 | /* This function is used to in self-checking mode |
| 468 | to check the assembled instruction |
| 469 | opcode should be the assembled opcode, and exp_opcode |
| 470 | the parsed string representing the expected opcode. */ |
| 471 | static void |
| 472 | nios2_check_assembly (unsigned int opcode, const char *exp_opcode) |
| 473 | { |
| 474 | if (nios2_mode == NIOS2_MODE_TEST) |
| 475 | { |
| 476 | if (exp_opcode == NULL) |
| 477 | as_bad (_("expecting opcode string in self test mode")); |
| 478 | else if (opcode != strtoul (exp_opcode, NULL, 16)) |
| 479 | as_bad (_("assembly 0x%08x, expected %s"), opcode, exp_opcode); |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | \f |
| 484 | /** Support for machine-dependent assembler directives. */ |
| 485 | /* Handle the .align pseudo-op. This aligns to a power of two. It |
| 486 | also adjusts any current instruction label. We treat this the same |
| 487 | way the MIPS port does: .align 0 turns off auto alignment. */ |
| 488 | static void |
| 489 | s_nios2_align (int ignore ATTRIBUTE_UNUSED) |
| 490 | { |
| 491 | int align; |
| 492 | char fill; |
| 493 | const char *pfill = NULL; |
| 494 | long max_alignment = 15; |
| 495 | |
| 496 | align = get_absolute_expression (); |
| 497 | if (align > max_alignment) |
| 498 | { |
| 499 | align = max_alignment; |
| 500 | as_bad (_("Alignment too large: %d. assumed"), align); |
| 501 | } |
| 502 | else if (align < 0) |
| 503 | { |
| 504 | as_warn (_("Alignment negative: 0 assumed")); |
| 505 | align = 0; |
| 506 | } |
| 507 | |
| 508 | if (*input_line_pointer == ',') |
| 509 | { |
| 510 | input_line_pointer++; |
| 511 | fill = get_absolute_expression (); |
| 512 | pfill = (const char *) &fill; |
| 513 | } |
| 514 | else if (subseg_text_p (now_seg)) |
| 515 | pfill = (const char *) &nop; |
| 516 | else |
| 517 | { |
| 518 | pfill = NULL; |
| 519 | nios2_last_label = NULL; |
| 520 | } |
| 521 | |
| 522 | if (align != 0) |
| 523 | { |
| 524 | nios2_auto_align_on = 1; |
| 525 | nios2_align (align, pfill, nios2_last_label); |
| 526 | nios2_last_label = NULL; |
| 527 | } |
| 528 | else |
| 529 | nios2_auto_align_on = 0; |
| 530 | |
| 531 | demand_empty_rest_of_line (); |
| 532 | } |
| 533 | |
| 534 | /* Handle the .text pseudo-op. This is like the usual one, but it |
| 535 | clears the saved last label and resets known alignment. */ |
| 536 | static void |
| 537 | s_nios2_text (int i) |
| 538 | { |
| 539 | s_text (i); |
| 540 | nios2_last_label = NULL; |
| 541 | nios2_current_align = 0; |
| 542 | nios2_current_align_seg = now_seg; |
| 543 | } |
| 544 | |
| 545 | /* Handle the .data pseudo-op. This is like the usual one, but it |
| 546 | clears the saved last label and resets known alignment. */ |
| 547 | static void |
| 548 | s_nios2_data (int i) |
| 549 | { |
| 550 | s_data (i); |
| 551 | nios2_last_label = NULL; |
| 552 | nios2_current_align = 0; |
| 553 | nios2_current_align_seg = now_seg; |
| 554 | } |
| 555 | |
| 556 | /* Handle the .section pseudo-op. This is like the usual one, but it |
| 557 | clears the saved last label and resets known alignment. */ |
| 558 | static void |
| 559 | s_nios2_section (int ignore) |
| 560 | { |
| 561 | obj_elf_section (ignore); |
| 562 | nios2_last_label = NULL; |
| 563 | nios2_current_align = 0; |
| 564 | nios2_current_align_seg = now_seg; |
| 565 | } |
| 566 | |
| 567 | /* Explicitly unaligned cons. */ |
| 568 | static void |
| 569 | s_nios2_ucons (int nbytes) |
| 570 | { |
| 571 | int hold; |
| 572 | hold = nios2_auto_align_on; |
| 573 | nios2_auto_align_on = 0; |
| 574 | cons (nbytes); |
| 575 | nios2_auto_align_on = hold; |
| 576 | } |
| 577 | |
| 578 | /* Handle the .sdata directive. */ |
| 579 | static void |
| 580 | s_nios2_sdata (int ignore ATTRIBUTE_UNUSED) |
| 581 | { |
| 582 | get_absolute_expression (); /* Ignored. */ |
| 583 | subseg_new (".sdata", 0); |
| 584 | demand_empty_rest_of_line (); |
| 585 | } |
| 586 | |
| 587 | /* .set sets assembler options eg noat/at and is also used |
| 588 | to set symbol values (.equ, .equiv ). */ |
| 589 | static void |
| 590 | s_nios2_set (int equiv) |
| 591 | { |
| 592 | char *directive = input_line_pointer; |
| 593 | char delim = get_symbol_end (); |
| 594 | char *endline = input_line_pointer; |
| 595 | *endline = delim; |
| 596 | |
| 597 | /* We only want to handle ".set XXX" if the |
| 598 | user has tried ".set XXX, YYY" they are not |
| 599 | trying a directive. This prevents |
| 600 | us from polluting the name space. */ |
| 601 | SKIP_WHITESPACE (); |
| 602 | if (is_end_of_line[(unsigned char) *input_line_pointer]) |
| 603 | { |
| 604 | bfd_boolean done = TRUE; |
| 605 | *endline = 0; |
| 606 | |
| 607 | if (!strcmp (directive, "noat")) |
| 608 | nios2_as_options.noat = TRUE; |
| 609 | else if (!strcmp (directive, "at")) |
| 610 | nios2_as_options.noat = FALSE; |
| 611 | else if (!strcmp (directive, "nobreak")) |
| 612 | nios2_as_options.nobreak = TRUE; |
| 613 | else if (!strcmp (directive, "break")) |
| 614 | nios2_as_options.nobreak = FALSE; |
| 615 | else if (!strcmp (directive, "norelax")) |
| 616 | nios2_as_options.relax = relax_none; |
| 617 | else if (!strcmp (directive, "relaxsection")) |
| 618 | nios2_as_options.relax = relax_section; |
| 619 | else if (!strcmp (directive, "relaxall")) |
| 620 | nios2_as_options.relax = relax_all; |
| 621 | else |
| 622 | done = FALSE; |
| 623 | |
| 624 | if (done) |
| 625 | { |
| 626 | *endline = delim; |
| 627 | demand_empty_rest_of_line (); |
| 628 | return; |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | /* If we fall through to here, either we have ".set XXX, YYY" |
| 633 | or we have ".set XXX" where XXX is unknown or we have |
| 634 | a syntax error. */ |
| 635 | input_line_pointer = directive; |
| 636 | *endline = delim; |
| 637 | s_set (equiv); |
| 638 | } |
| 639 | |
| 640 | /* Machine-dependent assembler directives. |
| 641 | Format of each entry is: |
| 642 | { "directive", handler_func, param } */ |
| 643 | const pseudo_typeS md_pseudo_table[] = { |
| 644 | {"align", s_nios2_align, 0}, |
| 645 | {"text", s_nios2_text, 0}, |
| 646 | {"data", s_nios2_data, 0}, |
| 647 | {"section", s_nios2_section, 0}, |
| 648 | {"section.s", s_nios2_section, 0}, |
| 649 | {"sect", s_nios2_section, 0}, |
| 650 | {"sect.s", s_nios2_section, 0}, |
| 651 | /* .dword and .half are included for compatibility with MIPS. */ |
| 652 | {"dword", cons, 8}, |
| 653 | {"half", cons, 2}, |
| 654 | /* NIOS2 native word size is 4 bytes, so we override |
| 655 | the GAS default of 2. */ |
| 656 | {"word", cons, 4}, |
| 657 | /* Explicitly unaligned directives. */ |
| 658 | {"2byte", s_nios2_ucons, 2}, |
| 659 | {"4byte", s_nios2_ucons, 4}, |
| 660 | {"8byte", s_nios2_ucons, 8}, |
| 661 | {"16byte", s_nios2_ucons, 16}, |
| 662 | #ifdef OBJ_ELF |
| 663 | {"sdata", s_nios2_sdata, 0}, |
| 664 | #endif |
| 665 | {"set", s_nios2_set, 0}, |
| 666 | {NULL, NULL, 0} |
| 667 | }; |
| 668 | |
| 669 | \f |
| 670 | /** Relaxation support. */ |
| 671 | |
| 672 | /* We support two relaxation modes: a limited PC-relative mode with |
| 673 | -relax-section (the default), and an absolute jump mode with -relax-all. |
| 674 | |
| 675 | Nios II PC-relative branch instructions only support 16-bit offsets. |
| 676 | And, there's no good way to add a 32-bit constant to the PC without |
| 677 | using two registers. |
| 678 | |
| 679 | To deal with this, for the pc-relative relaxation mode we convert |
| 680 | br label |
| 681 | into a series of 16-bit adds, like: |
| 682 | nextpc at |
| 683 | addi at, at, 32767 |
| 684 | ... |
| 685 | addi at, at, remainder |
| 686 | jmp at |
| 687 | |
| 688 | Similarly, conditional branches are converted from |
| 689 | b(condition) r, s, label |
| 690 | into a series like: |
| 691 | b(opposite condition) r, s, skip |
| 692 | nextpc at |
| 693 | addi at, at, 32767 |
| 694 | ... |
| 695 | addi at, at, remainder |
| 696 | jmp at |
| 697 | skip: |
| 698 | |
| 699 | The compiler can do a better job, either by converting the branch |
| 700 | directly into a JMP (going through the GOT for PIC) or by allocating |
| 701 | a second register for the 32-bit displacement. |
| 702 | |
| 703 | For the -relax-all relaxation mode, the conversions are |
| 704 | movhi at, %hi(symbol+offset) |
| 705 | ori at, %lo(symbol+offset) |
| 706 | jmp at |
| 707 | and |
| 708 | b(opposite condition), r, s, skip |
| 709 | movhi at, %hi(symbol+offset) |
| 710 | ori at, %lo(symbol+offset) |
| 711 | jmp at |
| 712 | skip: |
| 713 | respectively. |
| 714 | */ |
| 715 | |
| 716 | /* Arbitrarily limit the number of addis we can insert; we need to be able |
| 717 | to specify the maximum growth size for each frag that contains a |
| 718 | relaxable branch. There's no point in specifying a huge number here |
| 719 | since that means the assembler needs to allocate that much extra |
| 720 | memory for every branch, and almost no real code will ever need it. |
| 721 | Plus, as already noted a better solution is to just use a jmp, or |
| 722 | allocate a second register to hold a 32-bit displacement. |
| 723 | FIXME: Rather than making this a constant, it could be controlled by |
| 724 | a command-line argument. */ |
| 725 | #define RELAX_MAX_ADDI 32 |
| 726 | |
| 727 | /* The fr_subtype field represents the target-specific relocation state. |
| 728 | It has type relax_substateT (unsigned int). We use it to track the |
| 729 | number of addis necessary, plus a bit to track whether this is a |
| 730 | conditional branch. |
| 731 | Regardless of the smaller RELAX_MAX_ADDI limit, we reserve 16 bits |
| 732 | in the fr_subtype to encode the number of addis so that the whole |
| 733 | theoretically-valid range is representable. |
| 734 | For the -relax-all mode, N = 0 represents an in-range branch and N = 1 |
| 735 | represents a branch that needs to be relaxed. */ |
| 736 | #define UBRANCH (0 << 16) |
| 737 | #define CBRANCH (1 << 16) |
| 738 | #define IS_CBRANCH(SUBTYPE) ((SUBTYPE) & CBRANCH) |
| 739 | #define IS_UBRANCH(SUBTYPE) (!IS_CBRANCH (SUBTYPE)) |
| 740 | #define UBRANCH_SUBTYPE(N) (UBRANCH | (N)) |
| 741 | #define CBRANCH_SUBTYPE(N) (CBRANCH | (N)) |
| 742 | #define SUBTYPE_ADDIS(SUBTYPE) ((SUBTYPE) & 0xffff) |
| 743 | |
| 744 | /* For the -relax-section mode, unconditional branches require 2 extra i |
| 745 | nstructions besides the addis, conditional branches require 3. */ |
| 746 | #define UBRANCH_ADDIS_TO_SIZE(N) (((N) + 2) * 4) |
| 747 | #define CBRANCH_ADDIS_TO_SIZE(N) (((N) + 3) * 4) |
| 748 | |
| 749 | /* For the -relax-all mode, unconditional branches require 3 instructions |
| 750 | and conditional branches require 4. */ |
| 751 | #define UBRANCH_JUMP_SIZE 12 |
| 752 | #define CBRANCH_JUMP_SIZE 16 |
| 753 | |
| 754 | /* Maximum sizes of relaxation sequences. */ |
| 755 | #define UBRANCH_MAX_SIZE \ |
| 756 | (nios2_as_options.relax == relax_all \ |
| 757 | ? UBRANCH_JUMP_SIZE \ |
| 758 | : UBRANCH_ADDIS_TO_SIZE (RELAX_MAX_ADDI)) |
| 759 | #define CBRANCH_MAX_SIZE \ |
| 760 | (nios2_as_options.relax == relax_all \ |
| 761 | ? CBRANCH_JUMP_SIZE \ |
| 762 | : CBRANCH_ADDIS_TO_SIZE (RELAX_MAX_ADDI)) |
| 763 | |
| 764 | /* Register number of AT, the assembler temporary. */ |
| 765 | #define AT_REGNUM 1 |
| 766 | |
| 767 | /* Determine how many bytes are required to represent the sequence |
| 768 | indicated by SUBTYPE. */ |
| 769 | static int |
| 770 | nios2_relax_subtype_size (relax_substateT subtype) |
| 771 | { |
| 772 | int n = SUBTYPE_ADDIS (subtype); |
| 773 | if (n == 0) |
| 774 | /* Regular conditional/unconditional branch instruction. */ |
| 775 | return 4; |
| 776 | else if (nios2_as_options.relax == relax_all) |
| 777 | return (IS_CBRANCH (subtype) ? CBRANCH_JUMP_SIZE : UBRANCH_JUMP_SIZE); |
| 778 | else if (IS_CBRANCH (subtype)) |
| 779 | return CBRANCH_ADDIS_TO_SIZE (n); |
| 780 | else |
| 781 | return UBRANCH_ADDIS_TO_SIZE (n); |
| 782 | } |
| 783 | |
| 784 | /* Estimate size of fragp before relaxation. |
| 785 | This could also examine the offset in fragp and adjust |
| 786 | fragp->fr_subtype, but we will do that in nios2_relax_frag anyway. */ |
| 787 | int |
| 788 | md_estimate_size_before_relax (fragS *fragp, segT segment ATTRIBUTE_UNUSED) |
| 789 | { |
| 790 | return nios2_relax_subtype_size (fragp->fr_subtype); |
| 791 | } |
| 792 | |
| 793 | /* Implement md_relax_frag, returning the change in size of the frag. */ |
| 794 | long |
| 795 | nios2_relax_frag (segT segment, fragS *fragp, long stretch) |
| 796 | { |
| 797 | addressT target = fragp->fr_offset; |
| 798 | relax_substateT subtype = fragp->fr_subtype; |
| 799 | symbolS *symbolp = fragp->fr_symbol; |
| 800 | |
| 801 | if (symbolp) |
| 802 | { |
| 803 | fragS *sym_frag = symbol_get_frag (symbolp); |
| 804 | offsetT offset; |
| 805 | int n; |
| 806 | |
| 807 | target += S_GET_VALUE (symbolp); |
| 808 | |
| 809 | /* See comments in write.c:relax_frag about handling of stretch. */ |
| 810 | if (stretch != 0 |
| 811 | && sym_frag->relax_marker != fragp->relax_marker) |
| 812 | { |
| 813 | if (stretch < 0 || sym_frag->region == fragp->region) |
| 814 | target += stretch; |
| 815 | else if (target < fragp->fr_address) |
| 816 | target = fragp->fr_next->fr_address + stretch; |
| 817 | } |
| 818 | |
| 819 | /* We subtract 4 because all pc relative branches are |
| 820 | from the next instruction. */ |
| 821 | offset = target - fragp->fr_address - fragp->fr_fix - 4; |
| 822 | if (offset >= -32768 && offset <= 32764) |
| 823 | /* Fits in PC-relative branch. */ |
| 824 | n = 0; |
| 825 | else if (nios2_as_options.relax == relax_all) |
| 826 | /* Convert to jump. */ |
| 827 | n = 1; |
| 828 | else if (nios2_as_options.relax == relax_section |
| 829 | && S_GET_SEGMENT (symbolp) == segment |
| 830 | && S_IS_DEFINED (symbolp)) |
| 831 | /* Attempt a PC-relative relaxation on a branch to a defined |
| 832 | symbol in the same segment. */ |
| 833 | { |
| 834 | /* The relaxation for conditional branches is offset by 4 |
| 835 | bytes because we insert the inverted branch around the |
| 836 | sequence. */ |
| 837 | if (IS_CBRANCH (subtype)) |
| 838 | offset = offset - 4; |
| 839 | if (offset > 0) |
| 840 | n = offset / 32767 + 1; |
| 841 | else |
| 842 | n = offset / -32768 + 1; |
| 843 | |
| 844 | /* Bail out immediately if relaxation has failed. If we try to |
| 845 | defer the diagnostic to md_convert_frag, some pathological test |
| 846 | cases (e.g. gcc/testsuite/gcc.c-torture/compile/20001226-1.c) |
| 847 | apparently never converge. By returning 0 here we could pretend |
| 848 | to the caller that nothing has changed, but that leaves things |
| 849 | in an inconsistent state when we get to md_convert_frag. */ |
| 850 | if (n > RELAX_MAX_ADDI) |
| 851 | { |
| 852 | as_bad_where (fragp->fr_file, fragp->fr_line, |
| 853 | _("branch offset out of range\n")); |
| 854 | as_fatal (_("branch relaxation failed\n")); |
| 855 | } |
| 856 | } |
| 857 | else |
| 858 | /* We cannot handle this case, diagnose overflow later. */ |
| 859 | return 0; |
| 860 | |
| 861 | if (IS_CBRANCH (subtype)) |
| 862 | fragp->fr_subtype = CBRANCH_SUBTYPE (n); |
| 863 | else |
| 864 | fragp->fr_subtype = UBRANCH_SUBTYPE (n); |
| 865 | |
| 866 | return (nios2_relax_subtype_size (fragp->fr_subtype) |
| 867 | - nios2_relax_subtype_size (subtype)); |
| 868 | } |
| 869 | |
| 870 | /* If we got here, it's probably an error. */ |
| 871 | return 0; |
| 872 | } |
| 873 | |
| 874 | |
| 875 | /* Complete fragp using the data from the relaxation pass. */ |
| 876 | void |
| 877 | md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED, |
| 878 | fragS *fragp) |
| 879 | { |
| 880 | char *buffer = fragp->fr_literal + fragp->fr_fix; |
| 881 | relax_substateT subtype = fragp->fr_subtype; |
| 882 | int n = SUBTYPE_ADDIS (subtype); |
| 883 | addressT target = fragp->fr_offset; |
| 884 | symbolS *symbolp = fragp->fr_symbol; |
| 885 | offsetT offset; |
| 886 | unsigned int addend_mask, addi_mask; |
| 887 | offsetT addend, remainder; |
| 888 | int i; |
| 889 | |
| 890 | /* If we didn't or can't relax, this is a regular branch instruction. |
| 891 | We just need to generate the fixup for the symbol and offset. */ |
| 892 | if (n == 0) |
| 893 | { |
| 894 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset, 1, |
| 895 | BFD_RELOC_16_PCREL); |
| 896 | fragp->fr_fix += 4; |
| 897 | return; |
| 898 | } |
| 899 | |
| 900 | /* Replace the cbranch at fr_fix with one that has the opposite condition |
| 901 | in order to jump around the block of instructions we'll be adding. */ |
| 902 | if (IS_CBRANCH (subtype)) |
| 903 | { |
| 904 | unsigned int br_opcode; |
| 905 | int nbytes; |
| 906 | |
| 907 | /* Account for the nextpc and jmp in the pc-relative case, or the two |
| 908 | load instructions and jump in the absolute case. */ |
| 909 | if (nios2_as_options.relax == relax_section) |
| 910 | nbytes = (n + 2) * 4; |
| 911 | else |
| 912 | nbytes = 12; |
| 913 | |
| 914 | br_opcode = md_chars_to_number (buffer, 4); |
| 915 | switch (br_opcode & OP_MASK_OP) |
| 916 | { |
| 917 | case OP_MATCH_BEQ: |
| 918 | br_opcode = (br_opcode & ~OP_MASK_OP) | OP_MATCH_BNE; |
| 919 | break; |
| 920 | case OP_MATCH_BNE: |
| 921 | br_opcode = (br_opcode & ~OP_MASK_OP) | OP_MATCH_BEQ ; |
| 922 | break; |
| 923 | case OP_MATCH_BGE: |
| 924 | br_opcode = (br_opcode & ~OP_MASK_OP) | OP_MATCH_BLT ; |
| 925 | break; |
| 926 | case OP_MATCH_BGEU: |
| 927 | br_opcode = (br_opcode & ~OP_MASK_OP) | OP_MATCH_BLTU ; |
| 928 | break; |
| 929 | case OP_MATCH_BLT: |
| 930 | br_opcode = (br_opcode & ~OP_MASK_OP) | OP_MATCH_BGE ; |
| 931 | break; |
| 932 | case OP_MATCH_BLTU: |
| 933 | br_opcode = (br_opcode & ~OP_MASK_OP) | OP_MATCH_BGEU ; |
| 934 | break; |
| 935 | default: |
| 936 | as_bad_where (fragp->fr_file, fragp->fr_line, |
| 937 | _("expecting conditional branch for relaxation\n")); |
| 938 | abort (); |
| 939 | } |
| 940 | |
| 941 | br_opcode = br_opcode | (nbytes << OP_SH_IMM16); |
| 942 | md_number_to_chars (buffer, br_opcode, 4); |
| 943 | fragp->fr_fix += 4; |
| 944 | buffer += 4; |
| 945 | } |
| 946 | |
| 947 | /* Load at for the PC-relative case. */ |
| 948 | if (nios2_as_options.relax == relax_section) |
| 949 | { |
| 950 | /* Insert the nextpc instruction. */ |
| 951 | md_number_to_chars (buffer, |
| 952 | OP_MATCH_NEXTPC | (AT_REGNUM << OP_SH_RRD), 4); |
| 953 | fragp->fr_fix += 4; |
| 954 | buffer += 4; |
| 955 | |
| 956 | /* We need to know whether the offset is positive or negative. */ |
| 957 | target += S_GET_VALUE (symbolp); |
| 958 | offset = target - fragp->fr_address - fragp->fr_fix; |
| 959 | if (offset > 0) |
| 960 | addend = 32767; |
| 961 | else |
| 962 | addend = -32768; |
| 963 | addend_mask = (((unsigned int)addend) & 0xffff) << OP_SH_IMM16; |
| 964 | |
| 965 | /* Insert n-1 addi instructions. */ |
| 966 | addi_mask = (OP_MATCH_ADDI |
| 967 | | (AT_REGNUM << OP_SH_IRD) |
| 968 | | (AT_REGNUM << OP_SH_IRS)); |
| 969 | for (i = 0; i < n - 1; i ++) |
| 970 | { |
| 971 | md_number_to_chars (buffer, addi_mask | addend_mask, 4); |
| 972 | fragp->fr_fix += 4; |
| 973 | buffer += 4; |
| 974 | } |
| 975 | |
| 976 | /* Insert the last addi instruction to hold the remainder. */ |
| 977 | remainder = offset - addend * (n - 1); |
| 978 | gas_assert (remainder >= -32768 && remainder <= 32767); |
| 979 | addend_mask = (((unsigned int)remainder) & 0xffff) << OP_SH_IMM16; |
| 980 | md_number_to_chars (buffer, addi_mask | addend_mask, 4); |
| 981 | fragp->fr_fix += 4; |
| 982 | buffer += 4; |
| 983 | } |
| 984 | |
| 985 | /* Load at for the absolute case. */ |
| 986 | else |
| 987 | { |
| 988 | md_number_to_chars (buffer, OP_MATCH_ORHI | 0x00400000, 4); |
| 989 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset, |
| 990 | 0, BFD_RELOC_NIOS2_HI16); |
| 991 | fragp->fr_fix += 4; |
| 992 | buffer += 4; |
| 993 | md_number_to_chars (buffer, OP_MATCH_ORI | 0x08400000, 4); |
| 994 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset, |
| 995 | 0, BFD_RELOC_NIOS2_LO16); |
| 996 | fragp->fr_fix += 4; |
| 997 | buffer += 4; |
| 998 | } |
| 999 | |
| 1000 | /* Insert the jmp instruction. */ |
| 1001 | md_number_to_chars (buffer, OP_MATCH_JMP | (AT_REGNUM << OP_SH_RRS), 4); |
| 1002 | fragp->fr_fix += 4; |
| 1003 | buffer += 4; |
| 1004 | } |
| 1005 | |
| 1006 | \f |
| 1007 | /** Fixups and overflow checking. */ |
| 1008 | |
| 1009 | /* Check a fixup for overflow. */ |
| 1010 | static bfd_boolean |
| 1011 | nios2_check_overflow (valueT fixup, reloc_howto_type *howto) |
| 1012 | { |
| 1013 | /* Apply the rightshift before checking for overflow. */ |
| 1014 | fixup = ((signed)fixup) >> howto->rightshift; |
| 1015 | |
| 1016 | /* Check for overflow - return TRUE if overflow, FALSE if not. */ |
| 1017 | switch (howto->complain_on_overflow) |
| 1018 | { |
| 1019 | case complain_overflow_dont: |
| 1020 | break; |
| 1021 | case complain_overflow_bitfield: |
| 1022 | if ((fixup >> howto->bitsize) != 0 |
| 1023 | && ((signed) fixup >> howto->bitsize) != -1) |
| 1024 | return TRUE; |
| 1025 | break; |
| 1026 | case complain_overflow_signed: |
| 1027 | if ((fixup & 0x80000000) > 0) |
| 1028 | { |
| 1029 | /* Check for negative overflow. */ |
| 1030 | if ((signed) fixup < ((signed) 0x80000000 >> howto->bitsize)) |
| 1031 | return TRUE; |
| 1032 | } |
| 1033 | else |
| 1034 | { |
| 1035 | /* Check for positive overflow. */ |
| 1036 | if (fixup >= ((unsigned) 1 << (howto->bitsize - 1))) |
| 1037 | return TRUE; |
| 1038 | } |
| 1039 | break; |
| 1040 | case complain_overflow_unsigned: |
| 1041 | if ((fixup >> howto->bitsize) != 0) |
| 1042 | return TRUE; |
| 1043 | break; |
| 1044 | default: |
| 1045 | as_bad (_("error checking for overflow - broken assembler")); |
| 1046 | break; |
| 1047 | } |
| 1048 | return FALSE; |
| 1049 | } |
| 1050 | |
| 1051 | /* Emit diagnostic for fixup overflow. */ |
| 1052 | static void |
| 1053 | nios2_diagnose_overflow (valueT fixup, reloc_howto_type *howto, |
| 1054 | fixS *fixP, valueT value) |
| 1055 | { |
| 1056 | if (fixP->fx_r_type == BFD_RELOC_8 |
| 1057 | || fixP->fx_r_type == BFD_RELOC_16 |
| 1058 | || fixP->fx_r_type == BFD_RELOC_32) |
| 1059 | /* These relocs are against data, not instructions. */ |
| 1060 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1061 | _("immediate value 0x%x truncated to 0x%x"), |
| 1062 | (unsigned int) fixup, |
| 1063 | (unsigned int) (~(~(valueT) 0 << howto->bitsize) & fixup)); |
| 1064 | else |
| 1065 | { |
| 1066 | /* What opcode is the instruction? This will determine |
| 1067 | whether we check for overflow in immediate values |
| 1068 | and what error message we get. */ |
| 1069 | const struct nios2_opcode *opcode; |
| 1070 | enum overflow_type overflow_msg_type; |
| 1071 | unsigned int range_min; |
| 1072 | unsigned int range_max; |
| 1073 | unsigned int address; |
| 1074 | gas_assert (fixP->fx_size == 4); |
| 1075 | opcode = nios2_find_opcode_hash (value); |
| 1076 | gas_assert (opcode); |
| 1077 | overflow_msg_type = opcode->overflow_msg; |
| 1078 | switch (overflow_msg_type) |
| 1079 | { |
| 1080 | case call_target_overflow: |
| 1081 | range_min |
| 1082 | = ((fixP->fx_frag->fr_address + fixP->fx_where) & 0xf0000000); |
| 1083 | range_max = range_min + 0x0fffffff; |
| 1084 | address = fixup | range_min; |
| 1085 | |
| 1086 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1087 | _("call target address 0x%08x out of range 0x%08x to 0x%08x"), |
| 1088 | address, range_min, range_max); |
| 1089 | break; |
| 1090 | case branch_target_overflow: |
| 1091 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1092 | _("branch offset %d out of range %d to %d"), |
| 1093 | (int)fixup, -32768, 32767); |
| 1094 | break; |
| 1095 | case address_offset_overflow: |
| 1096 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1097 | _("%s offset %d out of range %d to %d"), |
| 1098 | opcode->name, (int)fixup, -32768, 32767); |
| 1099 | break; |
| 1100 | case signed_immed16_overflow: |
| 1101 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1102 | _("immediate value %d out of range %d to %d"), |
| 1103 | (int)fixup, -32768, 32767); |
| 1104 | break; |
| 1105 | case unsigned_immed16_overflow: |
| 1106 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1107 | _("immediate value %u out of range %u to %u"), |
| 1108 | (unsigned int)fixup, 0, 65535); |
| 1109 | break; |
| 1110 | case unsigned_immed5_overflow: |
| 1111 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1112 | _("immediate value %u out of range %u to %u"), |
| 1113 | (unsigned int)fixup, 0, 31); |
| 1114 | break; |
| 1115 | case custom_opcode_overflow: |
| 1116 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1117 | _("custom instruction opcode %u out of range %u to %u"), |
| 1118 | (unsigned int)fixup, 0, 255); |
| 1119 | break; |
| 1120 | default: |
| 1121 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1122 | _("overflow in immediate argument")); |
| 1123 | break; |
| 1124 | } |
| 1125 | } |
| 1126 | } |
| 1127 | |
| 1128 | /* Apply a fixup to the object file. */ |
| 1129 | void |
| 1130 | md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) |
| 1131 | { |
| 1132 | /* Assert that the fixup is one we can handle. */ |
| 1133 | gas_assert (fixP != NULL && valP != NULL |
| 1134 | && (fixP->fx_r_type == BFD_RELOC_8 |
| 1135 | || fixP->fx_r_type == BFD_RELOC_16 |
| 1136 | || fixP->fx_r_type == BFD_RELOC_32 |
| 1137 | || fixP->fx_r_type == BFD_RELOC_64 |
| 1138 | || fixP->fx_r_type == BFD_RELOC_NIOS2_S16 |
| 1139 | || fixP->fx_r_type == BFD_RELOC_NIOS2_U16 |
| 1140 | || fixP->fx_r_type == BFD_RELOC_16_PCREL |
| 1141 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL26 |
| 1142 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM5 |
| 1143 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CACHE_OPX |
| 1144 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM6 |
| 1145 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM8 |
| 1146 | || fixP->fx_r_type == BFD_RELOC_NIOS2_HI16 |
| 1147 | || fixP->fx_r_type == BFD_RELOC_NIOS2_LO16 |
| 1148 | || fixP->fx_r_type == BFD_RELOC_NIOS2_HIADJ16 |
| 1149 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GPREL |
| 1150 | || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT |
| 1151 | || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY |
| 1152 | || fixP->fx_r_type == BFD_RELOC_NIOS2_UJMP |
| 1153 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CJMP |
| 1154 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALLR |
| 1155 | || fixP->fx_r_type == BFD_RELOC_NIOS2_ALIGN |
| 1156 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOT16 |
| 1157 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL16 |
| 1158 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_LO |
| 1159 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_HA |
| 1160 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_GD16 |
| 1161 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LDM16 |
| 1162 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LDO16 |
| 1163 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_IE16 |
| 1164 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LE16 |
| 1165 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF |
| 1166 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPREL |
| 1167 | /* Add other relocs here as we generate them. */ |
| 1168 | )); |
| 1169 | |
| 1170 | if (fixP->fx_r_type == BFD_RELOC_64) |
| 1171 | { |
| 1172 | /* We may reach here due to .8byte directives, but we never output |
| 1173 | BFD_RELOC_64; it must be resolved. */ |
| 1174 | if (fixP->fx_addsy != NULL) |
| 1175 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1176 | _("cannot create 64-bit relocation")); |
| 1177 | else |
| 1178 | { |
| 1179 | md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, |
| 1180 | *valP, 8); |
| 1181 | fixP->fx_done = 1; |
| 1182 | } |
| 1183 | return; |
| 1184 | } |
| 1185 | |
| 1186 | /* The value passed in valP can be the value of a fully |
| 1187 | resolved expression, or it can be the value of a partially |
| 1188 | resolved expression. In the former case, both fixP->fx_addsy |
| 1189 | and fixP->fx_subsy are NULL, and fixP->fx_offset == *valP, and |
| 1190 | we can fix up the instruction that fixP relates to. |
| 1191 | In the latter case, one or both of fixP->fx_addsy and |
| 1192 | fixP->fx_subsy are not NULL, and fixP->fx_offset may or may not |
| 1193 | equal *valP. We don't need to check for fixP->fx_subsy being null |
| 1194 | because the generic part of the assembler generates an error if |
| 1195 | it is not an absolute symbol. */ |
| 1196 | if (fixP->fx_addsy != NULL) |
| 1197 | /* Partially resolved expression. */ |
| 1198 | { |
| 1199 | fixP->fx_addnumber = fixP->fx_offset; |
| 1200 | fixP->fx_done = 0; |
| 1201 | |
| 1202 | switch (fixP->fx_r_type) |
| 1203 | { |
| 1204 | case BFD_RELOC_NIOS2_TLS_GD16: |
| 1205 | case BFD_RELOC_NIOS2_TLS_LDM16: |
| 1206 | case BFD_RELOC_NIOS2_TLS_LDO16: |
| 1207 | case BFD_RELOC_NIOS2_TLS_IE16: |
| 1208 | case BFD_RELOC_NIOS2_TLS_LE16: |
| 1209 | case BFD_RELOC_NIOS2_TLS_DTPMOD: |
| 1210 | case BFD_RELOC_NIOS2_TLS_DTPREL: |
| 1211 | case BFD_RELOC_NIOS2_TLS_TPREL: |
| 1212 | S_SET_THREAD_LOCAL (fixP->fx_addsy); |
| 1213 | break; |
| 1214 | default: |
| 1215 | break; |
| 1216 | } |
| 1217 | } |
| 1218 | else |
| 1219 | /* Fully resolved fixup. */ |
| 1220 | { |
| 1221 | reloc_howto_type *howto |
| 1222 | = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); |
| 1223 | |
| 1224 | if (howto == NULL) |
| 1225 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1226 | _("relocation is not supported")); |
| 1227 | else |
| 1228 | { |
| 1229 | valueT fixup = *valP; |
| 1230 | valueT value; |
| 1231 | char *buf; |
| 1232 | |
| 1233 | /* If this is a pc-relative relocation, we need to |
| 1234 | subtract the current offset within the object file |
| 1235 | FIXME : for some reason fixP->fx_pcrel isn't 1 when it should be |
| 1236 | so I'm using the howto structure instead to determine this. */ |
| 1237 | if (howto->pc_relative == 1) |
| 1238 | fixup = fixup - (fixP->fx_frag->fr_address + fixP->fx_where + 4); |
| 1239 | |
| 1240 | /* Get the instruction or data to be fixed up. */ |
| 1241 | buf = fixP->fx_frag->fr_literal + fixP->fx_where; |
| 1242 | value = md_chars_to_number (buf, fixP->fx_size); |
| 1243 | |
| 1244 | /* Check for overflow, emitting a diagnostic if necessary. */ |
| 1245 | if (nios2_check_overflow (fixup, howto)) |
| 1246 | nios2_diagnose_overflow (fixup, howto, fixP, value); |
| 1247 | |
| 1248 | /* Apply the right shift. */ |
| 1249 | fixup = ((signed)fixup) >> howto->rightshift; |
| 1250 | |
| 1251 | /* Truncate the fixup to right size. */ |
| 1252 | switch (fixP->fx_r_type) |
| 1253 | { |
| 1254 | case BFD_RELOC_NIOS2_HI16: |
| 1255 | fixup = (fixup >> 16) & 0xFFFF; |
| 1256 | break; |
| 1257 | case BFD_RELOC_NIOS2_LO16: |
| 1258 | fixup = fixup & 0xFFFF; |
| 1259 | break; |
| 1260 | case BFD_RELOC_NIOS2_HIADJ16: |
| 1261 | fixup = ((fixup >> 16) & 0xFFFF) + ((fixup >> 15) & 0x01); |
| 1262 | break; |
| 1263 | default: |
| 1264 | { |
| 1265 | int n = sizeof (fixup) * 8 - howto->bitsize; |
| 1266 | fixup = (fixup << n) >> n; |
| 1267 | break; |
| 1268 | } |
| 1269 | } |
| 1270 | |
| 1271 | /* Fix up the instruction. */ |
| 1272 | value = (value & ~howto->dst_mask) | (fixup << howto->bitpos); |
| 1273 | md_number_to_chars (buf, value, fixP->fx_size); |
| 1274 | } |
| 1275 | |
| 1276 | fixP->fx_done = 1; |
| 1277 | } |
| 1278 | |
| 1279 | if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT) |
| 1280 | { |
| 1281 | fixP->fx_done = 0; |
| 1282 | if (fixP->fx_addsy |
| 1283 | && !S_IS_DEFINED (fixP->fx_addsy) && !S_IS_WEAK (fixP->fx_addsy)) |
| 1284 | S_SET_WEAK (fixP->fx_addsy); |
| 1285 | } |
| 1286 | else if (fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) |
| 1287 | fixP->fx_done = 0; |
| 1288 | } |
| 1289 | |
| 1290 | |
| 1291 | \f |
| 1292 | /** Instruction parsing support. */ |
| 1293 | |
| 1294 | /* Special relocation directive strings. */ |
| 1295 | |
| 1296 | struct nios2_special_relocS |
| 1297 | { |
| 1298 | const char *string; |
| 1299 | bfd_reloc_code_real_type reloc_type; |
| 1300 | }; |
| 1301 | |
| 1302 | struct nios2_special_relocS nios2_special_reloc[] = { |
| 1303 | {"%hiadj", BFD_RELOC_NIOS2_HIADJ16}, |
| 1304 | {"%hi", BFD_RELOC_NIOS2_HI16}, |
| 1305 | {"%lo", BFD_RELOC_NIOS2_LO16}, |
| 1306 | {"%gprel", BFD_RELOC_NIOS2_GPREL}, |
| 1307 | {"%call", BFD_RELOC_NIOS2_CALL16}, |
| 1308 | {"%gotoff_lo", BFD_RELOC_NIOS2_GOTOFF_LO}, |
| 1309 | {"%gotoff_hiadj", BFD_RELOC_NIOS2_GOTOFF_HA}, |
| 1310 | {"%tls_gd", BFD_RELOC_NIOS2_TLS_GD16}, |
| 1311 | {"%tls_ldm", BFD_RELOC_NIOS2_TLS_LDM16}, |
| 1312 | {"%tls_ldo", BFD_RELOC_NIOS2_TLS_LDO16}, |
| 1313 | {"%tls_ie", BFD_RELOC_NIOS2_TLS_IE16}, |
| 1314 | {"%tls_le", BFD_RELOC_NIOS2_TLS_LE16}, |
| 1315 | {"%gotoff", BFD_RELOC_NIOS2_GOTOFF}, |
| 1316 | {"%got", BFD_RELOC_NIOS2_GOT16} |
| 1317 | }; |
| 1318 | |
| 1319 | #define NIOS2_NUM_SPECIAL_RELOCS \ |
| 1320 | (sizeof(nios2_special_reloc)/sizeof(nios2_special_reloc[0])) |
| 1321 | const int nios2_num_special_relocs = NIOS2_NUM_SPECIAL_RELOCS; |
| 1322 | |
| 1323 | /* Creates a new nios2_insn_relocS and returns a pointer to it. */ |
| 1324 | static nios2_insn_relocS * |
| 1325 | nios2_insn_reloc_new (bfd_reloc_code_real_type reloc_type, unsigned int pcrel) |
| 1326 | { |
| 1327 | nios2_insn_relocS *retval; |
| 1328 | retval = (nios2_insn_relocS *) malloc (sizeof (nios2_insn_relocS)); |
| 1329 | if (retval == NULL) |
| 1330 | { |
| 1331 | as_bad (_("can't create relocation")); |
| 1332 | abort (); |
| 1333 | } |
| 1334 | |
| 1335 | /* Fill out the fields with default values. */ |
| 1336 | retval->reloc_next = NULL; |
| 1337 | retval->reloc_type = reloc_type; |
| 1338 | retval->reloc_pcrel = pcrel; |
| 1339 | return retval; |
| 1340 | } |
| 1341 | |
| 1342 | /* Frees up memory previously allocated by nios2_insn_reloc_new(). */ |
| 1343 | /* FIXME: this is never called; memory leak? */ |
| 1344 | #if 0 |
| 1345 | static void |
| 1346 | nios2_insn_reloc_destroy (nios2_insn_relocS *reloc) |
| 1347 | { |
| 1348 | gas_assert (reloc != NULL); |
| 1349 | free (reloc); |
| 1350 | } |
| 1351 | #endif |
| 1352 | |
| 1353 | /* The various nios2_assemble_* functions call this |
| 1354 | function to generate an expression from a string representing an expression. |
| 1355 | It then tries to evaluate the expression, and if it can, returns its value. |
| 1356 | If not, it creates a new nios2_insn_relocS and stores the expression and |
| 1357 | reloc_type for future use. */ |
| 1358 | static unsigned long |
| 1359 | nios2_assemble_expression (const char *exprstr, |
| 1360 | nios2_insn_infoS *insn, |
| 1361 | nios2_insn_relocS *prev_reloc, |
| 1362 | bfd_reloc_code_real_type reloc_type, |
| 1363 | unsigned int pcrel) |
| 1364 | { |
| 1365 | nios2_insn_relocS *reloc; |
| 1366 | char *saved_line_ptr; |
| 1367 | unsigned short value; |
| 1368 | int i; |
| 1369 | |
| 1370 | gas_assert (exprstr != NULL); |
| 1371 | gas_assert (insn != NULL); |
| 1372 | |
| 1373 | /* Check for relocation operators. |
| 1374 | Change the relocation type and advance the ptr to the start of |
| 1375 | the expression proper. */ |
| 1376 | for (i = 0; i < nios2_num_special_relocs; i++) |
| 1377 | if (strstr (exprstr, nios2_special_reloc[i].string) != NULL) |
| 1378 | { |
| 1379 | reloc_type = nios2_special_reloc[i].reloc_type; |
| 1380 | exprstr += strlen (nios2_special_reloc[i].string) + 1; |
| 1381 | |
| 1382 | /* %lo and %hiadj have different meanings for PC-relative |
| 1383 | expressions. */ |
| 1384 | if (pcrel) |
| 1385 | { |
| 1386 | if (reloc_type == BFD_RELOC_NIOS2_LO16) |
| 1387 | reloc_type = BFD_RELOC_NIOS2_PCREL_LO; |
| 1388 | if (reloc_type == BFD_RELOC_NIOS2_HIADJ16) |
| 1389 | reloc_type = BFD_RELOC_NIOS2_PCREL_HA; |
| 1390 | } |
| 1391 | |
| 1392 | break; |
| 1393 | } |
| 1394 | |
| 1395 | /* We potentially have a relocation. */ |
| 1396 | reloc = nios2_insn_reloc_new (reloc_type, pcrel); |
| 1397 | if (prev_reloc != NULL) |
| 1398 | prev_reloc->reloc_next = reloc; |
| 1399 | else |
| 1400 | insn->insn_reloc = reloc; |
| 1401 | |
| 1402 | /* Parse the expression string. */ |
| 1403 | saved_line_ptr = input_line_pointer; |
| 1404 | input_line_pointer = (char *) exprstr; |
| 1405 | expression (&reloc->reloc_expression); |
| 1406 | input_line_pointer = saved_line_ptr; |
| 1407 | |
| 1408 | /* This is redundant as the fixup will put this into |
| 1409 | the instruction, but it is included here so that |
| 1410 | self-test mode (-r) works. */ |
| 1411 | value = 0; |
| 1412 | if (nios2_mode == NIOS2_MODE_TEST |
| 1413 | && reloc->reloc_expression.X_op == O_constant) |
| 1414 | value = reloc->reloc_expression.X_add_number; |
| 1415 | |
| 1416 | return (unsigned long) value; |
| 1417 | } |
| 1418 | |
| 1419 | /* Argument assemble functions. |
| 1420 | All take an instruction argument string, and a pointer |
| 1421 | to an instruction opcode. Upon return the insn_opcode |
| 1422 | has the relevant fields filled in to represent the arg |
| 1423 | string. The return value is NULL if successful, or |
| 1424 | an error message if an error was detected. |
| 1425 | |
| 1426 | The naming conventions for these functions match the args template |
| 1427 | in the nios2_opcode structure, as documented in include/opcode/nios2.h. |
| 1428 | For example, nios2_assemble_args_dst is used for instructions with |
| 1429 | "d,s,t" args. |
| 1430 | See nios2_arg_info_structs below for the exact correspondence. */ |
| 1431 | |
| 1432 | static void |
| 1433 | nios2_assemble_args_dst (nios2_insn_infoS *insn_info) |
| 1434 | { |
| 1435 | if (insn_info->insn_tokens[1] != NULL |
| 1436 | && insn_info->insn_tokens[2] != NULL |
| 1437 | && insn_info->insn_tokens[3] != NULL) |
| 1438 | { |
| 1439 | struct nios2_reg *dst = nios2_reg_lookup (insn_info->insn_tokens[1]); |
| 1440 | struct nios2_reg *src1 = nios2_reg_lookup (insn_info->insn_tokens[2]); |
| 1441 | struct nios2_reg *src2 = nios2_reg_lookup (insn_info->insn_tokens[3]); |
| 1442 | |
| 1443 | if (dst == NULL) |
| 1444 | as_bad (_("unknown register %s"), insn_info->insn_tokens[1]); |
| 1445 | else |
| 1446 | SET_INSN_FIELD (RRD, insn_info->insn_code, dst->index); |
| 1447 | |
| 1448 | if (src1 == NULL) |
| 1449 | as_bad (_("unknown register %s"), insn_info->insn_tokens[2]); |
| 1450 | else |
| 1451 | SET_INSN_FIELD (RRS, insn_info->insn_code, src1->index); |
| 1452 | |
| 1453 | if (src2 == NULL) |
| 1454 | as_bad (_("unknown register %s"), insn_info->insn_tokens[3]); |
| 1455 | else |
| 1456 | SET_INSN_FIELD (RRT, insn_info->insn_code, src2->index); |
| 1457 | |
| 1458 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[4]); |
| 1459 | } |
| 1460 | } |
| 1461 | |
| 1462 | static void |
| 1463 | nios2_assemble_args_tsi (nios2_insn_infoS *insn_info) |
| 1464 | { |
| 1465 | if (insn_info->insn_tokens[1] != NULL && |
| 1466 | insn_info->insn_tokens[2] != NULL && insn_info->insn_tokens[3] != NULL) |
| 1467 | { |
| 1468 | struct nios2_reg *dst = nios2_reg_lookup (insn_info->insn_tokens[1]); |
| 1469 | struct nios2_reg *src1 = nios2_reg_lookup (insn_info->insn_tokens[2]); |
| 1470 | unsigned int src2 |
| 1471 | = nios2_assemble_expression (insn_info->insn_tokens[3], insn_info, |
| 1472 | insn_info->insn_reloc, BFD_RELOC_NIOS2_S16, |
| 1473 | 0); |
| 1474 | |
| 1475 | if (dst == NULL) |
| 1476 | as_bad (_("unknown register %s"), insn_info->insn_tokens[1]); |
| 1477 | else |
| 1478 | SET_INSN_FIELD (IRT, insn_info->insn_code, dst->index); |
| 1479 | |
| 1480 | if (src1 == NULL) |
| 1481 | as_bad (_("unknown register %s"), insn_info->insn_tokens[2]); |
| 1482 | else |
| 1483 | SET_INSN_FIELD (IRS, insn_info->insn_code, src1->index); |
| 1484 | |
| 1485 | SET_INSN_FIELD (IMM16, insn_info->insn_code, src2); |
| 1486 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[4]); |
| 1487 | SET_INSN_FIELD (IMM16, insn_info->insn_code, 0); |
| 1488 | } |
| 1489 | } |
| 1490 | |
| 1491 | static void |
| 1492 | nios2_assemble_args_tsu (nios2_insn_infoS *insn_info) |
| 1493 | { |
| 1494 | if (insn_info->insn_tokens[1] != NULL |
| 1495 | && insn_info->insn_tokens[2] != NULL |
| 1496 | && insn_info->insn_tokens[3] != NULL) |
| 1497 | { |
| 1498 | struct nios2_reg *dst = nios2_reg_lookup (insn_info->insn_tokens[1]); |
| 1499 | struct nios2_reg *src1 = nios2_reg_lookup (insn_info->insn_tokens[2]); |
| 1500 | unsigned int src2 |
| 1501 | = nios2_assemble_expression (insn_info->insn_tokens[3], insn_info, |
| 1502 | insn_info->insn_reloc, BFD_RELOC_NIOS2_U16, |
| 1503 | 0); |
| 1504 | |
| 1505 | if (dst == NULL) |
| 1506 | as_bad (_("unknown register %s"), insn_info->insn_tokens[1]); |
| 1507 | else |
| 1508 | SET_INSN_FIELD (IRT, insn_info->insn_code, dst->index); |
| 1509 | |
| 1510 | if (src1 == NULL) |
| 1511 | as_bad (_("unknown register %s"), insn_info->insn_tokens[2]); |
| 1512 | else |
| 1513 | SET_INSN_FIELD (IRS, insn_info->insn_code, src1->index); |
| 1514 | |
| 1515 | SET_INSN_FIELD (IMM16, insn_info->insn_code, src2); |
| 1516 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[4]); |
| 1517 | SET_INSN_FIELD (IMM16, insn_info->insn_code, 0); |
| 1518 | } |
| 1519 | } |
| 1520 | |
| 1521 | static void |
| 1522 | nios2_assemble_args_sto (nios2_insn_infoS *insn_info) |
| 1523 | { |
| 1524 | if (insn_info->insn_tokens[1] != NULL |
| 1525 | && insn_info->insn_tokens[2] != NULL |
| 1526 | && insn_info->insn_tokens[3] != NULL) |
| 1527 | { |
| 1528 | struct nios2_reg *dst = nios2_reg_lookup (insn_info->insn_tokens[1]); |
| 1529 | struct nios2_reg *src1 = nios2_reg_lookup (insn_info->insn_tokens[2]); |
| 1530 | unsigned int src2 |
| 1531 | = nios2_assemble_expression (insn_info->insn_tokens[3], insn_info, |
| 1532 | insn_info->insn_reloc, BFD_RELOC_16_PCREL, |
| 1533 | 1); |
| 1534 | |
| 1535 | if (dst == NULL) |
| 1536 | as_bad (_("unknown register %s"), insn_info->insn_tokens[1]); |
| 1537 | else |
| 1538 | SET_INSN_FIELD (IRS, insn_info->insn_code, dst->index); |
| 1539 | |
| 1540 | if (src1 == NULL) |
| 1541 | as_bad (_("unknown register %s"), insn_info->insn_tokens[2]); |
| 1542 | else |
| 1543 | SET_INSN_FIELD (IRT, insn_info->insn_code, src1->index); |
| 1544 | |
| 1545 | SET_INSN_FIELD (IMM16, insn_info->insn_code, src2); |
| 1546 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[4]); |
| 1547 | SET_INSN_FIELD (IMM16, insn_info->insn_code, 0); |
| 1548 | } |
| 1549 | } |
| 1550 | |
| 1551 | static void |
| 1552 | nios2_assemble_args_o (nios2_insn_infoS *insn_info) |
| 1553 | { |
| 1554 | if (insn_info->insn_tokens[1] != NULL) |
| 1555 | { |
| 1556 | unsigned long immed |
| 1557 | = nios2_assemble_expression (insn_info->insn_tokens[1], insn_info, |
| 1558 | insn_info->insn_reloc, BFD_RELOC_16_PCREL, |
| 1559 | 1); |
| 1560 | SET_INSN_FIELD (IMM16, insn_info->insn_code, immed); |
| 1561 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[2]); |
| 1562 | SET_INSN_FIELD (IMM16, insn_info->insn_code, 0); |
| 1563 | } |
| 1564 | } |
| 1565 | |
| 1566 | static void |
| 1567 | nios2_assemble_args_is (nios2_insn_infoS *insn_info) |
| 1568 | { |
| 1569 | if (insn_info->insn_tokens[1] != NULL && insn_info->insn_tokens[2] != NULL) |
| 1570 | { |
| 1571 | struct nios2_reg *addr_src = nios2_reg_lookup (insn_info->insn_tokens[2]); |
| 1572 | unsigned long immed |
| 1573 | = nios2_assemble_expression (insn_info->insn_tokens[1], insn_info, |
| 1574 | insn_info->insn_reloc, BFD_RELOC_NIOS2_S16, |
| 1575 | 0); |
| 1576 | |
| 1577 | SET_INSN_FIELD (IMM16, insn_info->insn_code, immed); |
| 1578 | |
| 1579 | if (addr_src == NULL) |
| 1580 | as_bad (_("unknown base register %s"), insn_info->insn_tokens[2]); |
| 1581 | else |
| 1582 | SET_INSN_FIELD (RRS, insn_info->insn_code, addr_src->index); |
| 1583 | |
| 1584 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[3]); |
| 1585 | SET_INSN_FIELD (IMM16, insn_info->insn_code, 0); |
| 1586 | } |
| 1587 | } |
| 1588 | |
| 1589 | static void |
| 1590 | nios2_assemble_args_m (nios2_insn_infoS *insn_info) |
| 1591 | { |
| 1592 | if (insn_info->insn_tokens[1] != NULL) |
| 1593 | { |
| 1594 | unsigned long immed |
| 1595 | = nios2_assemble_expression (insn_info->insn_tokens[1], insn_info, |
| 1596 | insn_info->insn_reloc, |
| 1597 | BFD_RELOC_NIOS2_CALL26, 0); |
| 1598 | |
| 1599 | SET_INSN_FIELD (IMM26, insn_info->insn_code, immed); |
| 1600 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[2]); |
| 1601 | SET_INSN_FIELD (IMM26, insn_info->insn_code, 0); |
| 1602 | } |
| 1603 | } |
| 1604 | |
| 1605 | static void |
| 1606 | nios2_assemble_args_s (nios2_insn_infoS *insn_info) |
| 1607 | { |
| 1608 | if (insn_info->insn_tokens[1] != NULL) |
| 1609 | { |
| 1610 | struct nios2_reg *src = nios2_reg_lookup (insn_info->insn_tokens[1]); |
| 1611 | if (src == NULL) |
| 1612 | as_bad (_("unknown register %s"), insn_info->insn_tokens[1]); |
| 1613 | else |
| 1614 | SET_INSN_FIELD (RRS, insn_info->insn_code, src->index); |
| 1615 | |
| 1616 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[2]); |
| 1617 | } |
| 1618 | } |
| 1619 | |
| 1620 | static void |
| 1621 | nios2_assemble_args_tis (nios2_insn_infoS *insn_info) |
| 1622 | { |
| 1623 | if (insn_info->insn_tokens[1] != NULL |
| 1624 | && insn_info->insn_tokens[2] != NULL |
| 1625 | && insn_info->insn_tokens[3] != NULL) |
| 1626 | { |
| 1627 | struct nios2_reg *dst = nios2_reg_lookup (insn_info->insn_tokens[1]); |
| 1628 | struct nios2_reg *addr_src = nios2_reg_lookup (insn_info->insn_tokens[3]); |
| 1629 | unsigned long immed |
| 1630 | = nios2_assemble_expression (insn_info->insn_tokens[2], insn_info, |
| 1631 | insn_info->insn_reloc, BFD_RELOC_NIOS2_S16, |
| 1632 | 0); |
| 1633 | |
| 1634 | if (addr_src == NULL) |
| 1635 | as_bad (_("unknown register %s"), insn_info->insn_tokens[3]); |
| 1636 | else |
| 1637 | SET_INSN_FIELD (RRS, insn_info->insn_code, addr_src->index); |
| 1638 | |
| 1639 | if (dst == NULL) |
| 1640 | as_bad (_("unknown register %s"), insn_info->insn_tokens[1]); |
| 1641 | else |
| 1642 | SET_INSN_FIELD (RRT, insn_info->insn_code, dst->index); |
| 1643 | |
| 1644 | SET_INSN_FIELD (IMM16, insn_info->insn_code, immed); |
| 1645 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[4]); |
| 1646 | SET_INSN_FIELD (IMM16, insn_info->insn_code, 0); |
| 1647 | } |
| 1648 | } |
| 1649 | |
| 1650 | static void |
| 1651 | nios2_assemble_args_dc (nios2_insn_infoS *insn_info) |
| 1652 | { |
| 1653 | if (insn_info->insn_tokens[1] != NULL && insn_info->insn_tokens[2] != NULL) |
| 1654 | { |
| 1655 | struct nios2_reg *ctl = nios2_reg_lookup (insn_info->insn_tokens[2]); |
| 1656 | struct nios2_reg *dst = nios2_reg_lookup (insn_info->insn_tokens[1]); |
| 1657 | |
| 1658 | if (ctl == NULL) |
| 1659 | as_bad (_("unknown register %s"), insn_info->insn_tokens[1]); |
| 1660 | else |
| 1661 | SET_INSN_FIELD (RCTL, insn_info->insn_code, ctl->index); |
| 1662 | |
| 1663 | if (dst == NULL) |
| 1664 | as_bad (_("unknown register %s"), insn_info->insn_tokens[2]); |
| 1665 | else |
| 1666 | SET_INSN_FIELD (RRD, insn_info->insn_code, dst->index); |
| 1667 | |
| 1668 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[3]); |
| 1669 | } |
| 1670 | } |
| 1671 | |
| 1672 | static void |
| 1673 | nios2_assemble_args_cs (nios2_insn_infoS *insn_info) |
| 1674 | { |
| 1675 | if (insn_info->insn_tokens[1] != NULL && insn_info->insn_tokens[2] != NULL) |
| 1676 | { |
| 1677 | struct nios2_reg *ctl = nios2_reg_lookup (insn_info->insn_tokens[1]); |
| 1678 | struct nios2_reg *src = nios2_reg_lookup (insn_info->insn_tokens[2]); |
| 1679 | |
| 1680 | if (ctl == NULL) |
| 1681 | as_bad (_("unknown register %s"), insn_info->insn_tokens[1]); |
| 1682 | else if (ctl->index == 4) |
| 1683 | as_bad (_("ipending control register (ctl4) is read-only\n")); |
| 1684 | else |
| 1685 | SET_INSN_FIELD (RCTL, insn_info->insn_code, ctl->index); |
| 1686 | |
| 1687 | if (src == NULL) |
| 1688 | as_bad (_("unknown register %s"), insn_info->insn_tokens[2]); |
| 1689 | else |
| 1690 | SET_INSN_FIELD (RRS, insn_info->insn_code, src->index); |
| 1691 | |
| 1692 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[3]); |
| 1693 | } |
| 1694 | } |
| 1695 | |
| 1696 | static void |
| 1697 | nios2_assemble_args_ldst (nios2_insn_infoS *insn_info) |
| 1698 | { |
| 1699 | if (insn_info->insn_tokens[1] != NULL |
| 1700 | && insn_info->insn_tokens[2] != NULL |
| 1701 | && insn_info->insn_tokens[3] != NULL |
| 1702 | && insn_info->insn_tokens[4] != NULL) |
| 1703 | { |
| 1704 | unsigned long custom_n |
| 1705 | = nios2_assemble_expression (insn_info->insn_tokens[1], insn_info, |
| 1706 | insn_info->insn_reloc, |
| 1707 | BFD_RELOC_NIOS2_IMM8, 0); |
| 1708 | |
| 1709 | struct nios2_reg *dst = nios2_reg_lookup (insn_info->insn_tokens[2]); |
| 1710 | struct nios2_reg *src1 = nios2_reg_lookup (insn_info->insn_tokens[3]); |
| 1711 | struct nios2_reg *src2 = nios2_reg_lookup (insn_info->insn_tokens[4]); |
| 1712 | |
| 1713 | SET_INSN_FIELD (CUSTOM_N, insn_info->insn_code, custom_n); |
| 1714 | |
| 1715 | if (dst == NULL) |
| 1716 | as_bad (_("unknown register %s"), insn_info->insn_tokens[2]); |
| 1717 | else |
| 1718 | SET_INSN_FIELD (RRD, insn_info->insn_code, dst->index); |
| 1719 | |
| 1720 | if (src1 == NULL) |
| 1721 | as_bad (_("unknown register %s"), insn_info->insn_tokens[3]); |
| 1722 | else |
| 1723 | SET_INSN_FIELD (RRS, insn_info->insn_code, src1->index); |
| 1724 | |
| 1725 | if (src2 == NULL) |
| 1726 | as_bad (_("unknown register %s"), insn_info->insn_tokens[4]); |
| 1727 | else |
| 1728 | SET_INSN_FIELD (RRT, insn_info->insn_code, src2->index); |
| 1729 | |
| 1730 | /* Set or clear the bits to indicate whether coprocessor registers are |
| 1731 | used. */ |
| 1732 | if (nios2_coproc_reg (insn_info->insn_tokens[2])) |
| 1733 | SET_INSN_FIELD (CUSTOM_C, insn_info->insn_code, 0); |
| 1734 | else |
| 1735 | SET_INSN_FIELD (CUSTOM_C, insn_info->insn_code, 1); |
| 1736 | |
| 1737 | if (nios2_coproc_reg (insn_info->insn_tokens[3])) |
| 1738 | SET_INSN_FIELD (CUSTOM_A, insn_info->insn_code, 0); |
| 1739 | else |
| 1740 | SET_INSN_FIELD (CUSTOM_A, insn_info->insn_code, 1); |
| 1741 | |
| 1742 | if (nios2_coproc_reg (insn_info->insn_tokens[4])) |
| 1743 | SET_INSN_FIELD (CUSTOM_B, insn_info->insn_code, 0); |
| 1744 | else |
| 1745 | SET_INSN_FIELD (CUSTOM_B, insn_info->insn_code, 1); |
| 1746 | |
| 1747 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[5]); |
| 1748 | } |
| 1749 | } |
| 1750 | |
| 1751 | static void |
| 1752 | nios2_assemble_args_none (nios2_insn_infoS *insn_info ATTRIBUTE_UNUSED) |
| 1753 | { |
| 1754 | /* Nothing to do. */ |
| 1755 | } |
| 1756 | |
| 1757 | static void |
| 1758 | nios2_assemble_args_dsj (nios2_insn_infoS *insn_info) |
| 1759 | { |
| 1760 | if (insn_info->insn_tokens[1] != NULL |
| 1761 | && insn_info->insn_tokens[2] != NULL |
| 1762 | && insn_info->insn_tokens[3] != NULL) |
| 1763 | { |
| 1764 | struct nios2_reg *dst = nios2_reg_lookup (insn_info->insn_tokens[1]); |
| 1765 | struct nios2_reg *src1 = nios2_reg_lookup (insn_info->insn_tokens[2]); |
| 1766 | |
| 1767 | /* A 5-bit constant expression. */ |
| 1768 | unsigned int src2 = |
| 1769 | nios2_assemble_expression (insn_info->insn_tokens[3], insn_info, |
| 1770 | insn_info->insn_reloc, |
| 1771 | BFD_RELOC_NIOS2_IMM5, 0); |
| 1772 | |
| 1773 | if (dst == NULL) |
| 1774 | as_bad (_("unknown register %s"), insn_info->insn_tokens[1]); |
| 1775 | else |
| 1776 | SET_INSN_FIELD (RRD, insn_info->insn_code, dst->index); |
| 1777 | |
| 1778 | if (src1 == NULL) |
| 1779 | as_bad (_("unknown register %s"), insn_info->insn_tokens[2]); |
| 1780 | else |
| 1781 | SET_INSN_FIELD (RRS, insn_info->insn_code, src1->index); |
| 1782 | |
| 1783 | SET_INSN_FIELD (IMM5, insn_info->insn_code, src2); |
| 1784 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[4]); |
| 1785 | SET_INSN_FIELD (IMM5, insn_info->insn_code, 0); |
| 1786 | } |
| 1787 | } |
| 1788 | |
| 1789 | static void |
| 1790 | nios2_assemble_args_d (nios2_insn_infoS *insn_info) |
| 1791 | { |
| 1792 | if (insn_info->insn_tokens[1] != NULL) |
| 1793 | { |
| 1794 | struct nios2_reg *dst = nios2_reg_lookup (insn_info->insn_tokens[1]); |
| 1795 | |
| 1796 | if (dst == NULL) |
| 1797 | as_bad (_("unknown register %s"), insn_info->insn_tokens[1]); |
| 1798 | else |
| 1799 | SET_INSN_FIELD (RRD, insn_info->insn_code, dst->index); |
| 1800 | |
| 1801 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[2]); |
| 1802 | } |
| 1803 | } |
| 1804 | |
| 1805 | static void |
| 1806 | nios2_assemble_args_b (nios2_insn_infoS *insn_info) |
| 1807 | { |
| 1808 | unsigned int imm5 = 0; |
| 1809 | |
| 1810 | if (insn_info->insn_tokens[1] != NULL) |
| 1811 | { |
| 1812 | /* A 5-bit constant expression. */ |
| 1813 | imm5 = nios2_assemble_expression (insn_info->insn_tokens[1], |
| 1814 | insn_info, insn_info->insn_reloc, |
| 1815 | BFD_RELOC_NIOS2_IMM5, 0); |
| 1816 | SET_INSN_FIELD (TRAP_IMM5, insn_info->insn_code, imm5); |
| 1817 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[2]); |
| 1818 | } |
| 1819 | |
| 1820 | SET_INSN_FIELD (TRAP_IMM5, insn_info->insn_code, imm5); |
| 1821 | |
| 1822 | nios2_check_assembly (insn_info->insn_code, insn_info->insn_tokens[2]); |
| 1823 | } |
| 1824 | |
| 1825 | /* This table associates pointers to functions that parse the arguments to an |
| 1826 | instruction and fill in the relevant fields of the instruction. */ |
| 1827 | const nios2_arg_infoS nios2_arg_info_structs[] = { |
| 1828 | /* args, assemble_args_func */ |
| 1829 | {"d,s,t", nios2_assemble_args_dst}, |
| 1830 | {"d,s,t,E", nios2_assemble_args_dst}, |
| 1831 | {"t,s,i", nios2_assemble_args_tsi}, |
| 1832 | {"t,s,i,E", nios2_assemble_args_tsi}, |
| 1833 | {"t,s,u", nios2_assemble_args_tsu}, |
| 1834 | {"t,s,u,E", nios2_assemble_args_tsu}, |
| 1835 | {"s,t,o", nios2_assemble_args_sto}, |
| 1836 | {"s,t,o,E", nios2_assemble_args_sto}, |
| 1837 | {"o", nios2_assemble_args_o}, |
| 1838 | {"o,E", nios2_assemble_args_o}, |
| 1839 | {"s", nios2_assemble_args_s}, |
| 1840 | {"s,E", nios2_assemble_args_s}, |
| 1841 | {"", nios2_assemble_args_none}, |
| 1842 | {"E", nios2_assemble_args_none}, |
| 1843 | {"i(s)", nios2_assemble_args_is}, |
| 1844 | {"i(s)E", nios2_assemble_args_is}, |
| 1845 | {"m", nios2_assemble_args_m}, |
| 1846 | {"m,E", nios2_assemble_args_m}, |
| 1847 | {"t,i(s)", nios2_assemble_args_tis}, |
| 1848 | {"t,i(s)E", nios2_assemble_args_tis}, |
| 1849 | {"d,c", nios2_assemble_args_dc}, |
| 1850 | {"d,c,E", nios2_assemble_args_dc}, |
| 1851 | {"c,s", nios2_assemble_args_cs}, |
| 1852 | {"c,s,E", nios2_assemble_args_cs}, |
| 1853 | {"l,d,s,t", nios2_assemble_args_ldst}, |
| 1854 | {"l,d,s,t,E", nios2_assemble_args_ldst}, |
| 1855 | {"d,s,j", nios2_assemble_args_dsj}, |
| 1856 | {"d,s,j,E", nios2_assemble_args_dsj}, |
| 1857 | {"d", nios2_assemble_args_d}, |
| 1858 | {"d,E", nios2_assemble_args_d}, |
| 1859 | {"b", nios2_assemble_args_b}, |
| 1860 | {"b,E", nios2_assemble_args_b} |
| 1861 | }; |
| 1862 | |
| 1863 | #define NIOS2_NUM_ARGS \ |
| 1864 | ((sizeof(nios2_arg_info_structs)/sizeof(nios2_arg_info_structs[0]))) |
| 1865 | const int nios2_num_arg_info_structs = NIOS2_NUM_ARGS; |
| 1866 | |
| 1867 | /* The function consume_arg takes a pointer into a string |
| 1868 | of instruction tokens (args) and a pointer into a string |
| 1869 | representing the expected sequence of tokens and separators. |
| 1870 | It checks whether the first argument in argstr is of the |
| 1871 | expected type, throwing an error if it is not, and returns |
| 1872 | the pointer argstr. */ |
| 1873 | static char * |
| 1874 | nios2_consume_arg (nios2_insn_infoS *insn, char *argstr, const char *parsestr) |
| 1875 | { |
| 1876 | char *temp; |
| 1877 | int regno = -1; |
| 1878 | |
| 1879 | switch (*parsestr) |
| 1880 | { |
| 1881 | case 'c': |
| 1882 | if (!nios2_control_register_arg_p (argstr)) |
| 1883 | as_bad (_("expecting control register")); |
| 1884 | break; |
| 1885 | case 'd': |
| 1886 | case 's': |
| 1887 | case 't': |
| 1888 | |
| 1889 | /* We check to make sure we don't have a control register. */ |
| 1890 | if (nios2_control_register_arg_p (argstr)) |
| 1891 | as_bad (_("illegal use of control register")); |
| 1892 | |
| 1893 | /* And whether coprocessor registers are valid here. */ |
| 1894 | if (nios2_coproc_reg (argstr) |
| 1895 | && insn->insn_nios2_opcode->match != OP_MATCH_CUSTOM) |
| 1896 | as_bad (_("illegal use of coprocessor register\n")); |
| 1897 | |
| 1898 | /* Extract a register number if the register is of the |
| 1899 | form r[0-9]+, if it is a normal register, set |
| 1900 | regno to its number (0-31), else set regno to -1. */ |
| 1901 | if (argstr[0] == 'r' && ISDIGIT (argstr[1])) |
| 1902 | { |
| 1903 | char *p = argstr; |
| 1904 | |
| 1905 | ++p; |
| 1906 | regno = 0; |
| 1907 | do |
| 1908 | { |
| 1909 | regno *= 10; |
| 1910 | regno += *p - '0'; |
| 1911 | ++p; |
| 1912 | } |
| 1913 | while (ISDIGIT (*p)); |
| 1914 | } |
| 1915 | else |
| 1916 | regno = -1; |
| 1917 | |
| 1918 | /* And whether we are using at. */ |
| 1919 | if (!nios2_as_options.noat |
| 1920 | && (regno == 1 || strprefix (argstr, "at"))) |
| 1921 | as_warn (_("Register at (r1) can sometimes be corrupted by assembler " |
| 1922 | "optimizations.\n" |
| 1923 | "Use .set noat to turn off those optimizations (and this " |
| 1924 | "warning).")); |
| 1925 | |
| 1926 | /* And whether we are using oci registers. */ |
| 1927 | if (!nios2_as_options.nobreak |
| 1928 | && (regno == 25 || strprefix (argstr, "bt"))) |
| 1929 | as_warn (_("The debugger will corrupt bt (r25). If you don't need to " |
| 1930 | "debug this\n" |
| 1931 | "code then use .set nobreak to turn off this warning.")); |
| 1932 | |
| 1933 | if (!nios2_as_options.nobreak |
| 1934 | && (regno == 30 || strprefix (argstr, "ba"))) |
| 1935 | as_warn (_("The debugger will corrupt ba (r30). If you don't need to " |
| 1936 | "debug this\n" |
| 1937 | "code then use .set nobreak to turn off this warning.")); |
| 1938 | break; |
| 1939 | case 'i': |
| 1940 | case 'u': |
| 1941 | if (*argstr == '%') |
| 1942 | { |
| 1943 | if (nios2_special_relocation_p (argstr)) |
| 1944 | { |
| 1945 | /* We zap the parentheses because we don't want them confused |
| 1946 | with separators. */ |
| 1947 | temp = strchr (argstr, '('); |
| 1948 | if (temp != NULL) |
| 1949 | *temp = ' '; |
| 1950 | temp = strchr (argstr, ')'); |
| 1951 | if (temp != NULL) |
| 1952 | *temp = ' '; |
| 1953 | } |
| 1954 | else |
| 1955 | as_bad (_("badly formed expression near %s"), argstr); |
| 1956 | } |
| 1957 | break; |
| 1958 | case 'm': |
| 1959 | case 'j': |
| 1960 | case 'k': |
| 1961 | case 'l': |
| 1962 | case 'b': |
| 1963 | /* We can't have %hi, %lo or %hiadj here. */ |
| 1964 | if (*argstr == '%') |
| 1965 | as_bad (_("badly formed expression near %s"), argstr); |
| 1966 | break; |
| 1967 | default: |
| 1968 | break; |
| 1969 | } |
| 1970 | |
| 1971 | return argstr; |
| 1972 | } |
| 1973 | |
| 1974 | /* The function consume_separator takes a pointer into a string |
| 1975 | of instruction tokens (args) and a pointer into a string representing |
| 1976 | the expected sequence of tokens and separators. It finds the first |
| 1977 | instance of the character pointed to by separator in argstr, and |
| 1978 | returns a pointer to the next element of argstr, which is the |
| 1979 | following token in the sequence. */ |
| 1980 | static char * |
| 1981 | nios2_consume_separator (char *argstr, const char *separator) |
| 1982 | { |
| 1983 | char *p; |
| 1984 | |
| 1985 | /* If we have a opcode reg, expr(reg) type instruction, and |
| 1986 | * we are separating the expr from the (reg), we find the last |
| 1987 | * (, just in case the expression has parentheses. */ |
| 1988 | |
| 1989 | if (*separator == '(') |
| 1990 | p = strrchr (argstr, *separator); |
| 1991 | else |
| 1992 | p = strchr (argstr, *separator); |
| 1993 | |
| 1994 | if (p != NULL) |
| 1995 | *p++ = 0; |
| 1996 | else |
| 1997 | as_bad (_("expecting %c near %s"), *separator, argstr); |
| 1998 | return p; |
| 1999 | } |
| 2000 | |
| 2001 | |
| 2002 | /* The principal argument parsing function which takes a string argstr |
| 2003 | representing the instruction arguments for insn, and extracts the argument |
| 2004 | tokens matching parsestr into parsed_args. */ |
| 2005 | static void |
| 2006 | nios2_parse_args (nios2_insn_infoS *insn, char *argstr, |
| 2007 | const char *parsestr, char **parsed_args) |
| 2008 | { |
| 2009 | char *p; |
| 2010 | char *end = NULL; |
| 2011 | int i; |
| 2012 | p = argstr; |
| 2013 | i = 0; |
| 2014 | bfd_boolean terminate = FALSE; |
| 2015 | |
| 2016 | /* This rest of this function is it too fragile and it mostly works, |
| 2017 | therefore special case this one. */ |
| 2018 | if (*parsestr == 0 && argstr != 0) |
| 2019 | { |
| 2020 | as_bad (_("too many arguments")); |
| 2021 | parsed_args[0] = NULL; |
| 2022 | return; |
| 2023 | } |
| 2024 | |
| 2025 | while (p != NULL && !terminate && i < NIOS2_MAX_INSN_TOKENS) |
| 2026 | { |
| 2027 | parsed_args[i] = nios2_consume_arg (insn, p, parsestr); |
| 2028 | ++parsestr; |
| 2029 | if (*parsestr != '\0') |
| 2030 | { |
| 2031 | p = nios2_consume_separator (p, parsestr); |
| 2032 | ++parsestr; |
| 2033 | } |
| 2034 | else |
| 2035 | { |
| 2036 | /* Check that the argument string has no trailing arguments. */ |
| 2037 | /* If we've got a %lo etc relocation, we've zapped the parens with |
| 2038 | spaces. */ |
| 2039 | if (nios2_special_relocation_p (p)) |
| 2040 | end = strpbrk (p, ","); |
| 2041 | else |
| 2042 | end = strpbrk (p, " ,"); |
| 2043 | |
| 2044 | if (end != NULL) |
| 2045 | as_bad (_("too many arguments")); |
| 2046 | } |
| 2047 | |
| 2048 | if (*parsestr == '\0' || (p != NULL && *p == '\0')) |
| 2049 | terminate = TRUE; |
| 2050 | ++i; |
| 2051 | } |
| 2052 | |
| 2053 | parsed_args[i] = NULL; |
| 2054 | |
| 2055 | if (*parsestr != '\0' && insn->insn_nios2_opcode->match != OP_MATCH_BREAK) |
| 2056 | as_bad (_("missing argument")); |
| 2057 | } |
| 2058 | |
| 2059 | |
| 2060 | \f |
| 2061 | /** Support for pseudo-op parsing. These are macro-like opcodes that |
| 2062 | expand into real insns by suitable fiddling with the operands. */ |
| 2063 | |
| 2064 | /* Append the string modifier to the string contained in the argument at |
| 2065 | parsed_args[ndx]. */ |
| 2066 | static void |
| 2067 | nios2_modify_arg (char **parsed_args, const char *modifier, |
| 2068 | int unused ATTRIBUTE_UNUSED, int ndx) |
| 2069 | { |
| 2070 | char *tmp = parsed_args[ndx]; |
| 2071 | |
| 2072 | parsed_args[ndx] |
| 2073 | = (char *) malloc (strlen (parsed_args[ndx]) + strlen (modifier) + 1); |
| 2074 | strcpy (parsed_args[ndx], tmp); |
| 2075 | strcat (parsed_args[ndx], modifier); |
| 2076 | } |
| 2077 | |
| 2078 | /* Modify parsed_args[ndx] by negating that argument. */ |
| 2079 | static void |
| 2080 | nios2_negate_arg (char **parsed_args, const char *modifier ATTRIBUTE_UNUSED, |
| 2081 | int unused ATTRIBUTE_UNUSED, int ndx) |
| 2082 | { |
| 2083 | char *tmp = parsed_args[ndx]; |
| 2084 | |
| 2085 | parsed_args[ndx] |
| 2086 | = (char *) malloc (strlen ("~(") + strlen (parsed_args[ndx]) + |
| 2087 | strlen (")+1") + 1); |
| 2088 | |
| 2089 | strcpy (parsed_args[ndx], "~("); |
| 2090 | strcat (parsed_args[ndx], tmp); |
| 2091 | strcat (parsed_args[ndx], ")+1"); |
| 2092 | } |
| 2093 | |
| 2094 | /* The function nios2_swap_args swaps the pointers at indices index_1 and |
| 2095 | index_2 in the array parsed_args[] - this is used for operand swapping |
| 2096 | for comparison operations. */ |
| 2097 | static void |
| 2098 | nios2_swap_args (char **parsed_args, const char *unused ATTRIBUTE_UNUSED, |
| 2099 | int index_1, int index_2) |
| 2100 | { |
| 2101 | char *tmp; |
| 2102 | gas_assert (index_1 < NIOS2_MAX_INSN_TOKENS |
| 2103 | && index_2 < NIOS2_MAX_INSN_TOKENS); |
| 2104 | tmp = parsed_args[index_1]; |
| 2105 | parsed_args[index_1] = parsed_args[index_2]; |
| 2106 | parsed_args[index_2] = tmp; |
| 2107 | } |
| 2108 | |
| 2109 | /* This function appends the string appnd to the array of strings in |
| 2110 | parsed_args num times starting at index start in the array. */ |
| 2111 | static void |
| 2112 | nios2_append_arg (char **parsed_args, const char *appnd, int num, |
| 2113 | int start) |
| 2114 | { |
| 2115 | int i, count; |
| 2116 | char *tmp; |
| 2117 | |
| 2118 | gas_assert ((start + num) < NIOS2_MAX_INSN_TOKENS); |
| 2119 | |
| 2120 | if (nios2_mode == NIOS2_MODE_TEST) |
| 2121 | tmp = parsed_args[start]; |
| 2122 | else |
| 2123 | tmp = NULL; |
| 2124 | |
| 2125 | for (i = start, count = num; count > 0; ++i, --count) |
| 2126 | parsed_args[i] = (char *) appnd; |
| 2127 | |
| 2128 | gas_assert (i == (start + num)); |
| 2129 | parsed_args[i] = tmp; |
| 2130 | parsed_args[i + 1] = NULL; |
| 2131 | } |
| 2132 | |
| 2133 | /* This function inserts the string insert num times in the array |
| 2134 | parsed_args, starting at the index start. */ |
| 2135 | static void |
| 2136 | nios2_insert_arg (char **parsed_args, const char *insert, int num, |
| 2137 | int start) |
| 2138 | { |
| 2139 | int i, count; |
| 2140 | |
| 2141 | gas_assert ((start + num) < NIOS2_MAX_INSN_TOKENS); |
| 2142 | |
| 2143 | /* Move the existing arguments up to create space. */ |
| 2144 | for (i = NIOS2_MAX_INSN_TOKENS; i - num >= start; --i) |
| 2145 | parsed_args[i] = parsed_args[i - num]; |
| 2146 | |
| 2147 | for (i = start, count = num; count > 0; ++i, --count) |
| 2148 | parsed_args[i] = (char *) insert; |
| 2149 | } |
| 2150 | |
| 2151 | /* Cleanup function to free malloc'ed arg strings. */ |
| 2152 | static void |
| 2153 | nios2_free_arg (char **parsed_args, int num ATTRIBUTE_UNUSED, int start) |
| 2154 | { |
| 2155 | if (parsed_args[start]) |
| 2156 | { |
| 2157 | free (parsed_args[start]); |
| 2158 | parsed_args[start] = NULL; |
| 2159 | } |
| 2160 | } |
| 2161 | |
| 2162 | /* This function swaps the pseudo-op for a real op. */ |
| 2163 | static nios2_ps_insn_infoS* |
| 2164 | nios2_translate_pseudo_insn (nios2_insn_infoS *insn) |
| 2165 | { |
| 2166 | |
| 2167 | nios2_ps_insn_infoS *ps_insn; |
| 2168 | |
| 2169 | /* Find which real insn the pseudo-op transates to and |
| 2170 | switch the insn_info ptr to point to it. */ |
| 2171 | ps_insn = nios2_ps_lookup (insn->insn_nios2_opcode->name); |
| 2172 | |
| 2173 | if (ps_insn != NULL) |
| 2174 | { |
| 2175 | insn->insn_nios2_opcode = nios2_opcode_lookup (ps_insn->insn); |
| 2176 | insn->insn_tokens[0] = insn->insn_nios2_opcode->name; |
| 2177 | /* Modify the args so they work with the real insn. */ |
| 2178 | ps_insn->arg_modifer_func ((char **) insn->insn_tokens, |
| 2179 | ps_insn->arg_modifier, ps_insn->num, |
| 2180 | ps_insn->index); |
| 2181 | } |
| 2182 | else |
| 2183 | /* we cannot recover from this. */ |
| 2184 | as_fatal (_("unrecognized pseudo-instruction %s"), |
| 2185 | ps_insn->pseudo_insn); |
| 2186 | return ps_insn; |
| 2187 | } |
| 2188 | |
| 2189 | /* Invoke the cleanup handler for pseudo-insn ps_insn on insn. */ |
| 2190 | static void |
| 2191 | nios2_cleanup_pseudo_insn (nios2_insn_infoS *insn, |
| 2192 | nios2_ps_insn_infoS *ps_insn) |
| 2193 | { |
| 2194 | if (ps_insn->arg_cleanup_func) |
| 2195 | (ps_insn->arg_cleanup_func) ((char **) insn->insn_tokens, |
| 2196 | ps_insn->num, ps_insn->index); |
| 2197 | } |
| 2198 | |
| 2199 | const nios2_ps_insn_infoS nios2_ps_insn_info_structs[] = { |
| 2200 | /* pseudo-op, real-op, arg, arg_modifier_func, num, index, arg_cleanup_func */ |
| 2201 | {"mov", "add", nios2_append_arg, "zero", 1, 3, NULL}, |
| 2202 | {"movi", "addi", nios2_insert_arg, "zero", 1, 2, NULL}, |
| 2203 | {"movhi", "orhi", nios2_insert_arg, "zero", 1, 2, NULL}, |
| 2204 | {"movui", "ori", nios2_insert_arg, "zero", 1, 2, NULL}, |
| 2205 | {"movia", "orhi", nios2_insert_arg, "zero", 1, 2, NULL}, |
| 2206 | {"nop", "add", nios2_append_arg, "zero", 3, 1, NULL}, |
| 2207 | {"bgt", "blt", nios2_swap_args, "", 1, 2, NULL}, |
| 2208 | {"bgtu", "bltu", nios2_swap_args, "", 1, 2, NULL}, |
| 2209 | {"ble", "bge", nios2_swap_args, "", 1, 2, NULL}, |
| 2210 | {"bleu", "bgeu", nios2_swap_args, "", 1, 2, NULL}, |
| 2211 | {"cmpgt", "cmplt", nios2_swap_args, "", 2, 3, NULL}, |
| 2212 | {"cmpgtu", "cmpltu", nios2_swap_args, "", 2, 3, NULL}, |
| 2213 | {"cmple", "cmpge", nios2_swap_args, "", 2, 3, NULL}, |
| 2214 | {"cmpleu", "cmpgeu", nios2_swap_args, "", 2, 3, NULL}, |
| 2215 | {"cmpgti", "cmpgei", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, |
| 2216 | {"cmpgtui", "cmpgeui", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, |
| 2217 | {"cmplei", "cmplti", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, |
| 2218 | {"cmpleui", "cmpltui", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, |
| 2219 | {"subi", "addi", nios2_negate_arg, "", 0, 3, nios2_free_arg} |
| 2220 | /* Add further pseudo-ops here. */ |
| 2221 | }; |
| 2222 | |
| 2223 | #define NIOS2_NUM_PSEUDO_INSNS \ |
| 2224 | ((sizeof(nios2_ps_insn_info_structs)/ \ |
| 2225 | sizeof(nios2_ps_insn_info_structs[0]))) |
| 2226 | const int nios2_num_ps_insn_info_structs = NIOS2_NUM_PSEUDO_INSNS; |
| 2227 | |
| 2228 | \f |
| 2229 | /** Assembler output support. */ |
| 2230 | |
| 2231 | static int |
| 2232 | can_evaluate_expr (nios2_insn_infoS *insn) |
| 2233 | { |
| 2234 | /* Remove this check for null and the invalid insn "ori r9, 1234" seg faults. */ |
| 2235 | if (!insn->insn_reloc) |
| 2236 | /* ??? Ideally we should do something other than as_fatal here as we can |
| 2237 | continue to assemble. |
| 2238 | However this function (actually the output_* functions) should not |
| 2239 | have been called in the first place once an illegal instruction had |
| 2240 | been encountered. */ |
| 2241 | as_fatal (_("Invalid instruction encountered, cannot recover. No assembly attempted.")); |
| 2242 | |
| 2243 | if (insn->insn_reloc->reloc_expression.X_op == O_constant) |
| 2244 | return 1; |
| 2245 | |
| 2246 | return 0; |
| 2247 | } |
| 2248 | |
| 2249 | static int |
| 2250 | get_expr_value (nios2_insn_infoS *insn) |
| 2251 | { |
| 2252 | int value = 0; |
| 2253 | |
| 2254 | if (insn->insn_reloc->reloc_expression.X_op == O_constant) |
| 2255 | value = insn->insn_reloc->reloc_expression.X_add_number; |
| 2256 | return value; |
| 2257 | } |
| 2258 | |
| 2259 | /* Output a normal instruction. */ |
| 2260 | static void |
| 2261 | output_insn (nios2_insn_infoS *insn) |
| 2262 | { |
| 2263 | char *f; |
| 2264 | nios2_insn_relocS *reloc; |
| 2265 | |
| 2266 | f = frag_more (4); |
| 2267 | /* This allocates enough space for the instruction |
| 2268 | and puts it in the current frag. */ |
| 2269 | md_number_to_chars (f, insn->insn_code, 4); |
| 2270 | /* Emit debug info. */ |
| 2271 | dwarf2_emit_insn (4); |
| 2272 | /* Create any fixups to be acted on later. */ |
| 2273 | for (reloc = insn->insn_reloc; reloc != NULL; reloc = reloc->reloc_next) |
| 2274 | fix_new_exp (frag_now, f - frag_now->fr_literal, 4, |
| 2275 | &reloc->reloc_expression, reloc->reloc_pcrel, |
| 2276 | reloc->reloc_type); |
| 2277 | } |
| 2278 | |
| 2279 | /* Output an unconditional branch. */ |
| 2280 | static void |
| 2281 | output_ubranch (nios2_insn_infoS *insn) |
| 2282 | { |
| 2283 | nios2_insn_relocS *reloc = insn->insn_reloc; |
| 2284 | |
| 2285 | /* If the reloc is NULL, there was an error assembling the branch. */ |
| 2286 | if (reloc != NULL) |
| 2287 | { |
| 2288 | symbolS *symp = reloc->reloc_expression.X_add_symbol; |
| 2289 | offsetT offset = reloc->reloc_expression.X_add_number; |
| 2290 | char *f; |
| 2291 | |
| 2292 | /* Tag dwarf2 debug info to the address at the start of the insn. |
| 2293 | We must do it before frag_var() below closes off the frag. */ |
| 2294 | dwarf2_emit_insn (0); |
| 2295 | |
| 2296 | /* We create a machine dependent frag which can grow |
| 2297 | to accommodate the largest possible instruction sequence |
| 2298 | this may generate. */ |
| 2299 | f = frag_var (rs_machine_dependent, |
| 2300 | UBRANCH_MAX_SIZE, 4, UBRANCH_SUBTYPE (0), |
| 2301 | symp, offset, NULL); |
| 2302 | |
| 2303 | md_number_to_chars (f, insn->insn_code, 4); |
| 2304 | |
| 2305 | /* We leave fixup generation to md_convert_frag. */ |
| 2306 | } |
| 2307 | } |
| 2308 | |
| 2309 | /* Output a conditional branch. */ |
| 2310 | static void |
| 2311 | output_cbranch (nios2_insn_infoS *insn) |
| 2312 | { |
| 2313 | nios2_insn_relocS *reloc = insn->insn_reloc; |
| 2314 | |
| 2315 | /* If the reloc is NULL, there was an error assembling the branch. */ |
| 2316 | if (reloc != NULL) |
| 2317 | { |
| 2318 | symbolS *symp = reloc->reloc_expression.X_add_symbol; |
| 2319 | offsetT offset = reloc->reloc_expression.X_add_number; |
| 2320 | char *f; |
| 2321 | |
| 2322 | /* Tag dwarf2 debug info to the address at the start of the insn. |
| 2323 | We must do it before frag_var() below closes off the frag. */ |
| 2324 | dwarf2_emit_insn (0); |
| 2325 | |
| 2326 | /* We create a machine dependent frag which can grow |
| 2327 | to accommodate the largest possible instruction sequence |
| 2328 | this may generate. */ |
| 2329 | f = frag_var (rs_machine_dependent, |
| 2330 | CBRANCH_MAX_SIZE, 4, CBRANCH_SUBTYPE (0), |
| 2331 | symp, offset, NULL); |
| 2332 | |
| 2333 | md_number_to_chars (f, insn->insn_code, 4); |
| 2334 | |
| 2335 | /* We leave fixup generation to md_convert_frag. */ |
| 2336 | } |
| 2337 | } |
| 2338 | |
| 2339 | /* Output a call sequence. Since calls are not pc-relative for NIOS2, |
| 2340 | but are page-relative, we cannot tell at any stage in assembly |
| 2341 | whether a call will be out of range since a section may be linked |
| 2342 | at any address. So if we are relaxing, we convert all call instructions |
| 2343 | to long call sequences, and rely on the linker to relax them back to |
| 2344 | short calls. */ |
| 2345 | static void |
| 2346 | output_call (nios2_insn_infoS *insn) |
| 2347 | { |
| 2348 | /* This allocates enough space for the instruction |
| 2349 | and puts it in the current frag. */ |
| 2350 | char *f = frag_more (12); |
| 2351 | nios2_insn_relocS *reloc = insn->insn_reloc; |
| 2352 | |
| 2353 | md_number_to_chars (f, OP_MATCH_ORHI | 0x00400000, 4); |
| 2354 | dwarf2_emit_insn (4); |
| 2355 | fix_new_exp (frag_now, f - frag_now->fr_literal, 4, |
| 2356 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_HI16); |
| 2357 | md_number_to_chars (f + 4, OP_MATCH_ORI | 0x08400000, 4); |
| 2358 | dwarf2_emit_insn (4); |
| 2359 | fix_new_exp (frag_now, f - frag_now->fr_literal + 4, 4, |
| 2360 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_LO16); |
| 2361 | md_number_to_chars (f + 8, OP_MATCH_CALLR | 0x08000000, 4); |
| 2362 | dwarf2_emit_insn (4); |
| 2363 | } |
| 2364 | |
| 2365 | /* Output an addi - will silently convert to |
| 2366 | orhi if rA = r0 and (expr & 0xffff0000) == 0. */ |
| 2367 | static void |
| 2368 | output_addi (nios2_insn_infoS *insn) |
| 2369 | { |
| 2370 | if (can_evaluate_expr (insn)) |
| 2371 | { |
| 2372 | int expr_val = get_expr_value (insn); |
| 2373 | if (GET_INSN_FIELD (RRS, insn->insn_code) == 0 |
| 2374 | && (expr_val & 0xffff) == 0 |
| 2375 | && expr_val != 0) |
| 2376 | { |
| 2377 | /* We really want a movhi (orhi) here. */ |
| 2378 | insn->insn_code = (insn->insn_code & ~OP_MATCH_ADDI) | OP_MATCH_ORHI; |
| 2379 | insn->insn_reloc->reloc_expression.X_add_number = |
| 2380 | (insn->insn_reloc->reloc_expression.X_add_number >> 16) & 0xffff; |
| 2381 | insn->insn_reloc->reloc_type = BFD_RELOC_NIOS2_U16; |
| 2382 | } |
| 2383 | } |
| 2384 | |
| 2385 | /* Output an instruction. */ |
| 2386 | output_insn (insn); |
| 2387 | } |
| 2388 | |
| 2389 | static void |
| 2390 | output_andi (nios2_insn_infoS *insn) |
| 2391 | { |
| 2392 | if (can_evaluate_expr (insn)) |
| 2393 | { |
| 2394 | int expr_val = get_expr_value (insn); |
| 2395 | if (expr_val != 0 && (expr_val & 0xffff) == 0) |
| 2396 | { |
| 2397 | /* We really want a movhi (orhi) here. */ |
| 2398 | insn->insn_code = (insn->insn_code & ~OP_MATCH_ANDI) | OP_MATCH_ANDHI; |
| 2399 | insn->insn_reloc->reloc_expression.X_add_number = |
| 2400 | (insn->insn_reloc->reloc_expression.X_add_number >> 16) & 0xffff; |
| 2401 | insn->insn_reloc->reloc_type = BFD_RELOC_NIOS2_U16; |
| 2402 | } |
| 2403 | } |
| 2404 | |
| 2405 | /* Output an instruction. */ |
| 2406 | output_insn (insn); |
| 2407 | } |
| 2408 | |
| 2409 | static void |
| 2410 | output_ori (nios2_insn_infoS *insn) |
| 2411 | { |
| 2412 | if (can_evaluate_expr (insn)) |
| 2413 | { |
| 2414 | int expr_val = get_expr_value (insn); |
| 2415 | if (expr_val != 0 && (expr_val & 0xffff) == 0) |
| 2416 | { |
| 2417 | /* We really want a movhi (orhi) here. */ |
| 2418 | insn->insn_code = (insn->insn_code & ~OP_MATCH_ORI) | OP_MATCH_ORHI; |
| 2419 | insn->insn_reloc->reloc_expression.X_add_number = |
| 2420 | (insn->insn_reloc->reloc_expression.X_add_number >> 16) & 0xffff; |
| 2421 | insn->insn_reloc->reloc_type = BFD_RELOC_NIOS2_U16; |
| 2422 | } |
| 2423 | } |
| 2424 | |
| 2425 | /* Output an instruction. */ |
| 2426 | output_insn (insn); |
| 2427 | } |
| 2428 | |
| 2429 | static void |
| 2430 | output_xori (nios2_insn_infoS *insn) |
| 2431 | { |
| 2432 | if (can_evaluate_expr (insn)) |
| 2433 | { |
| 2434 | int expr_val = get_expr_value (insn); |
| 2435 | if (expr_val != 0 && (expr_val & 0xffff) == 0) |
| 2436 | { |
| 2437 | /* We really want a movhi (orhi) here. */ |
| 2438 | insn->insn_code = (insn->insn_code & ~OP_MATCH_XORI) | OP_MATCH_XORHI; |
| 2439 | insn->insn_reloc->reloc_expression.X_add_number = |
| 2440 | (insn->insn_reloc->reloc_expression.X_add_number >> 16) & 0xffff; |
| 2441 | insn->insn_reloc->reloc_type = BFD_RELOC_NIOS2_U16; |
| 2442 | } |
| 2443 | } |
| 2444 | |
| 2445 | /* Output an instruction. */ |
| 2446 | output_insn (insn); |
| 2447 | } |
| 2448 | |
| 2449 | |
| 2450 | /* Output a movhi/addi pair for the movia pseudo-op. */ |
| 2451 | static void |
| 2452 | output_movia (nios2_insn_infoS *insn) |
| 2453 | { |
| 2454 | /* This allocates enough space for the instruction |
| 2455 | and puts it in the current frag. */ |
| 2456 | char *f = frag_more (8); |
| 2457 | nios2_insn_relocS *reloc = insn->insn_reloc; |
| 2458 | unsigned long reg_index = GET_INSN_FIELD (IRT, insn->insn_code); |
| 2459 | |
| 2460 | /* If the reloc is NULL, there was an error assembling the movia. */ |
| 2461 | if (reloc != NULL) |
| 2462 | { |
| 2463 | md_number_to_chars (f, insn->insn_code, 4); |
| 2464 | dwarf2_emit_insn (4); |
| 2465 | md_number_to_chars (f + 4, |
| 2466 | (OP_MATCH_ADDI | (reg_index << OP_SH_IRT) |
| 2467 | | (reg_index << OP_SH_IRS)), |
| 2468 | 4); |
| 2469 | dwarf2_emit_insn (4); |
| 2470 | fix_new (frag_now, f - frag_now->fr_literal, 4, |
| 2471 | reloc->reloc_expression.X_add_symbol, |
| 2472 | reloc->reloc_expression.X_add_number, 0, |
| 2473 | BFD_RELOC_NIOS2_HIADJ16); |
| 2474 | fix_new (frag_now, f + 4 - frag_now->fr_literal, 4, |
| 2475 | reloc->reloc_expression.X_add_symbol, |
| 2476 | reloc->reloc_expression.X_add_number, 0, BFD_RELOC_NIOS2_LO16); |
| 2477 | } |
| 2478 | } |
| 2479 | |
| 2480 | |
| 2481 | \f |
| 2482 | /** External interfaces. */ |
| 2483 | |
| 2484 | /* The following functions are called by machine-independent parts of |
| 2485 | the assembler. */ |
| 2486 | int |
| 2487 | md_parse_option (int c, char *arg ATTRIBUTE_UNUSED) |
| 2488 | { |
| 2489 | switch (c) |
| 2490 | { |
| 2491 | case 'r': |
| 2492 | /* Hidden option for self-test mode. */ |
| 2493 | nios2_mode = NIOS2_MODE_TEST; |
| 2494 | break; |
| 2495 | case OPTION_RELAX_ALL: |
| 2496 | nios2_as_options.relax = relax_all; |
| 2497 | break; |
| 2498 | case OPTION_NORELAX: |
| 2499 | nios2_as_options.relax = relax_none; |
| 2500 | break; |
| 2501 | case OPTION_RELAX_SECTION: |
| 2502 | nios2_as_options.relax = relax_section; |
| 2503 | break; |
| 2504 | case OPTION_EB: |
| 2505 | target_big_endian = 1; |
| 2506 | break; |
| 2507 | case OPTION_EL: |
| 2508 | target_big_endian = 0; |
| 2509 | break; |
| 2510 | default: |
| 2511 | return 0; |
| 2512 | break; |
| 2513 | } |
| 2514 | |
| 2515 | return 1; |
| 2516 | } |
| 2517 | |
| 2518 | /* Implement TARGET_FORMAT. We can choose to be big-endian or |
| 2519 | little-endian at runtime based on a switch. */ |
| 2520 | const char * |
| 2521 | nios2_target_format (void) |
| 2522 | { |
| 2523 | return target_big_endian ? "elf32-bignios2" : "elf32-littlenios2"; |
| 2524 | } |
| 2525 | |
| 2526 | /* Machine-dependent usage message. */ |
| 2527 | void |
| 2528 | md_show_usage (FILE *stream) |
| 2529 | { |
| 2530 | fprintf (stream, " NIOS2 options:\n" |
| 2531 | " -relax-all replace all branch and call " |
| 2532 | "instructions with jmp and callr sequences\n" |
| 2533 | " -relax-section replace identified out of range " |
| 2534 | "branches with jmp sequences (default)\n" |
| 2535 | " -no-relax do not replace any branches or calls\n" |
| 2536 | " -EB force big-endian byte ordering\n" |
| 2537 | " -EL force little-endian byte ordering\n"); |
| 2538 | } |
| 2539 | |
| 2540 | /* This function is called once, at assembler startup time. |
| 2541 | It should set up all the tables, etc. that the MD part of the |
| 2542 | assembler will need. */ |
| 2543 | void |
| 2544 | md_begin (void) |
| 2545 | { |
| 2546 | int i; |
| 2547 | const char *inserted; |
| 2548 | |
| 2549 | /* Create and fill a hashtable for the Nios II opcodes, registers and |
| 2550 | arguments. */ |
| 2551 | nios2_opcode_hash = hash_new (); |
| 2552 | nios2_reg_hash = hash_new (); |
| 2553 | nios2_arg_hash = hash_new (); |
| 2554 | nios2_ps_hash = hash_new (); |
| 2555 | |
| 2556 | for (i = 0; i < NUMOPCODES; ++i) |
| 2557 | { |
| 2558 | inserted |
| 2559 | = hash_insert (nios2_opcode_hash, nios2_opcodes[i].name, |
| 2560 | (PTR) & nios2_opcodes[i]); |
| 2561 | if (inserted != NULL) |
| 2562 | { |
| 2563 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), |
| 2564 | nios2_opcodes[i].name, inserted); |
| 2565 | /* Probably a memory allocation problem? Give up now. */ |
| 2566 | as_fatal (_("Broken assembler. No assembly attempted.")); |
| 2567 | } |
| 2568 | } |
| 2569 | |
| 2570 | for (i = 0; i < nios2_num_regs; ++i) |
| 2571 | { |
| 2572 | inserted |
| 2573 | = hash_insert (nios2_reg_hash, nios2_regs[i].name, |
| 2574 | (PTR) & nios2_regs[i]); |
| 2575 | if (inserted != NULL) |
| 2576 | { |
| 2577 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), |
| 2578 | nios2_regs[i].name, inserted); |
| 2579 | /* Probably a memory allocation problem? Give up now. */ |
| 2580 | as_fatal (_("Broken assembler. No assembly attempted.")); |
| 2581 | } |
| 2582 | |
| 2583 | } |
| 2584 | |
| 2585 | for (i = 0; i < nios2_num_arg_info_structs; ++i) |
| 2586 | { |
| 2587 | inserted |
| 2588 | = hash_insert (nios2_arg_hash, nios2_arg_info_structs[i].args, |
| 2589 | (PTR) & nios2_arg_info_structs[i]); |
| 2590 | if (inserted != NULL) |
| 2591 | { |
| 2592 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), |
| 2593 | nios2_arg_info_structs[i].args, inserted); |
| 2594 | /* Probably a memory allocation problem? Give up now. */ |
| 2595 | as_fatal (_("Broken assembler. No assembly attempted.")); |
| 2596 | } |
| 2597 | } |
| 2598 | |
| 2599 | for (i = 0; i < nios2_num_ps_insn_info_structs; ++i) |
| 2600 | { |
| 2601 | inserted |
| 2602 | = hash_insert (nios2_ps_hash, nios2_ps_insn_info_structs[i].pseudo_insn, |
| 2603 | (PTR) & nios2_ps_insn_info_structs[i]); |
| 2604 | if (inserted != NULL) |
| 2605 | { |
| 2606 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), |
| 2607 | nios2_ps_insn_info_structs[i].pseudo_insn, inserted); |
| 2608 | /* Probably a memory allocation problem? Give up now. */ |
| 2609 | as_fatal (_("Broken assembler. No assembly attempted.")); |
| 2610 | } |
| 2611 | } |
| 2612 | |
| 2613 | /* Assembler option defaults. */ |
| 2614 | nios2_as_options.noat = FALSE; |
| 2615 | nios2_as_options.nobreak = FALSE; |
| 2616 | |
| 2617 | /* Debug information is incompatible with relaxation. */ |
| 2618 | if (debug_type != DEBUG_UNSPECIFIED) |
| 2619 | nios2_as_options.relax = relax_none; |
| 2620 | |
| 2621 | /* Initialize the alignment data. */ |
| 2622 | nios2_current_align_seg = now_seg; |
| 2623 | nios2_last_label = NULL; |
| 2624 | nios2_current_align = 0; |
| 2625 | } |
| 2626 | |
| 2627 | |
| 2628 | /* Assembles a single line of Nios II assembly language. */ |
| 2629 | void |
| 2630 | md_assemble (char *op_str) |
| 2631 | { |
| 2632 | char *argstr; |
| 2633 | char *op_strdup = NULL; |
| 2634 | nios2_arg_infoS *arg_info; |
| 2635 | unsigned long saved_pinfo = 0; |
| 2636 | nios2_insn_infoS thisinsn; |
| 2637 | nios2_insn_infoS *insn = &thisinsn; |
| 2638 | |
| 2639 | /* Make sure we are aligned on a 4-byte boundary. */ |
| 2640 | if (nios2_current_align < 2) |
| 2641 | nios2_align (2, NULL, nios2_last_label); |
| 2642 | else if (nios2_current_align > 2) |
| 2643 | nios2_current_align = 2; |
| 2644 | nios2_last_label = NULL; |
| 2645 | |
| 2646 | /* We don't want to clobber to op_str |
| 2647 | because we want to be able to use it in messages. */ |
| 2648 | op_strdup = strdup (op_str); |
| 2649 | insn->insn_tokens[0] = strtok (op_strdup, " "); |
| 2650 | argstr = strtok (NULL, ""); |
| 2651 | |
| 2652 | /* Assemble the opcode. */ |
| 2653 | insn->insn_nios2_opcode = nios2_opcode_lookup (insn->insn_tokens[0]); |
| 2654 | insn->insn_reloc = NULL; |
| 2655 | |
| 2656 | if (insn->insn_nios2_opcode != NULL) |
| 2657 | { |
| 2658 | nios2_ps_insn_infoS *ps_insn = NULL; |
| 2659 | /* Set the opcode for the instruction. */ |
| 2660 | insn->insn_code = insn->insn_nios2_opcode->match; |
| 2661 | |
| 2662 | /* Parse the arguments pointed to by argstr. */ |
| 2663 | if (nios2_mode == NIOS2_MODE_ASSEMBLE) |
| 2664 | nios2_parse_args (insn, argstr, insn->insn_nios2_opcode->args, |
| 2665 | (char **) &insn->insn_tokens[1]); |
| 2666 | else |
| 2667 | nios2_parse_args (insn, argstr, insn->insn_nios2_opcode->args_test, |
| 2668 | (char **) &insn->insn_tokens[1]); |
| 2669 | |
| 2670 | /* We need to preserve the MOVIA macro as this is clobbered by |
| 2671 | translate_pseudo_insn. */ |
| 2672 | if (insn->insn_nios2_opcode->pinfo == NIOS2_INSN_MACRO_MOVIA) |
| 2673 | saved_pinfo = NIOS2_INSN_MACRO_MOVIA; |
| 2674 | /* If the instruction is an pseudo-instruction, we want to replace it |
| 2675 | with its real equivalent, and then continue. */ |
| 2676 | if ((insn->insn_nios2_opcode->pinfo & NIOS2_INSN_MACRO) |
| 2677 | == NIOS2_INSN_MACRO) |
| 2678 | ps_insn = nios2_translate_pseudo_insn (insn); |
| 2679 | |
| 2680 | /* Find the assemble function, and call it. */ |
| 2681 | arg_info = nios2_arg_lookup (insn->insn_nios2_opcode->args); |
| 2682 | if (arg_info != NULL) |
| 2683 | { |
| 2684 | arg_info->assemble_args_func (insn); |
| 2685 | |
| 2686 | if (nios2_as_options.relax != relax_none |
| 2687 | && !nios2_as_options.noat |
| 2688 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_UBRANCH) |
| 2689 | output_ubranch (insn); |
| 2690 | else if (nios2_as_options.relax != relax_none |
| 2691 | && !nios2_as_options.noat |
| 2692 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_CBRANCH) |
| 2693 | output_cbranch (insn); |
| 2694 | else if (nios2_as_options.relax == relax_all |
| 2695 | && !nios2_as_options.noat |
| 2696 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_CALL |
| 2697 | && insn->insn_reloc |
| 2698 | && insn->insn_reloc->reloc_type == BFD_RELOC_NIOS2_CALL26) |
| 2699 | output_call (insn); |
| 2700 | else if (insn->insn_nios2_opcode->pinfo & NIOS2_INSN_ANDI) |
| 2701 | output_andi (insn); |
| 2702 | else if (insn->insn_nios2_opcode->pinfo & NIOS2_INSN_ORI) |
| 2703 | output_ori (insn); |
| 2704 | else if (insn->insn_nios2_opcode->pinfo & NIOS2_INSN_XORI) |
| 2705 | output_xori (insn); |
| 2706 | else if (insn->insn_nios2_opcode->pinfo & NIOS2_INSN_ADDI) |
| 2707 | output_addi (insn); |
| 2708 | else if (saved_pinfo == NIOS2_INSN_MACRO_MOVIA) |
| 2709 | output_movia (insn); |
| 2710 | else |
| 2711 | output_insn (insn); |
| 2712 | if (ps_insn) |
| 2713 | nios2_cleanup_pseudo_insn (insn, ps_insn); |
| 2714 | } |
| 2715 | else |
| 2716 | { |
| 2717 | /* The assembler is broken. */ |
| 2718 | fprintf (stderr, |
| 2719 | _("internal error: %s is not a valid argument syntax\n"), |
| 2720 | insn->insn_nios2_opcode->args); |
| 2721 | /* Probably a memory allocation problem. Give up now. */ |
| 2722 | as_fatal (_("Broken assembler. No assembly attempted.")); |
| 2723 | } |
| 2724 | } |
| 2725 | else |
| 2726 | /* Unrecognised instruction - error. */ |
| 2727 | as_bad (_("unrecognised instruction %s"), insn->insn_tokens[0]); |
| 2728 | |
| 2729 | /* Don't leak memory. */ |
| 2730 | free (op_strdup); |
| 2731 | } |
| 2732 | |
| 2733 | /* Round up section size. */ |
| 2734 | valueT |
| 2735 | md_section_align (asection *seg ATTRIBUTE_UNUSED, valueT size) |
| 2736 | { |
| 2737 | /* I think byte alignment is fine here. */ |
| 2738 | return size; |
| 2739 | } |
| 2740 | |
| 2741 | /* Implement TC_FORCE_RELOCATION. */ |
| 2742 | int |
| 2743 | nios2_force_relocation (fixS *fixp) |
| 2744 | { |
| 2745 | if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT |
| 2746 | || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY |
| 2747 | || fixp->fx_r_type == BFD_RELOC_NIOS2_ALIGN) |
| 2748 | return 1; |
| 2749 | |
| 2750 | return generic_force_reloc (fixp); |
| 2751 | } |
| 2752 | |
| 2753 | /* Implement tc_fix_adjustable. */ |
| 2754 | int |
| 2755 | nios2_fix_adjustable (fixS *fixp) |
| 2756 | { |
| 2757 | if (fixp->fx_addsy == NULL) |
| 2758 | return 1; |
| 2759 | |
| 2760 | #ifdef OBJ_ELF |
| 2761 | /* Prevent all adjustments to global symbols. */ |
| 2762 | if (OUTPUT_FLAVOR == bfd_target_elf_flavour |
| 2763 | && (S_IS_EXTERNAL (fixp->fx_addsy) || S_IS_WEAK (fixp->fx_addsy))) |
| 2764 | return 0; |
| 2765 | #endif |
| 2766 | if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT |
| 2767 | || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) |
| 2768 | return 0; |
| 2769 | |
| 2770 | /* Preserve relocations against symbols with function type. */ |
| 2771 | if (symbol_get_bfdsym (fixp->fx_addsy)->flags & BSF_FUNCTION) |
| 2772 | return 0; |
| 2773 | |
| 2774 | /* Don't allow symbols to be discarded on GOT related relocs. */ |
| 2775 | if (fixp->fx_r_type == BFD_RELOC_NIOS2_GOT16 |
| 2776 | || fixp->fx_r_type == BFD_RELOC_NIOS2_CALL16 |
| 2777 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_LO |
| 2778 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_HA |
| 2779 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_GD16 |
| 2780 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LDM16 |
| 2781 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LDO16 |
| 2782 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_IE16 |
| 2783 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LE16 |
| 2784 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPMOD |
| 2785 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPREL |
| 2786 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_TPREL |
| 2787 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF) |
| 2788 | return 0; |
| 2789 | |
| 2790 | return 1; |
| 2791 | } |
| 2792 | |
| 2793 | /* Implement tc_frob_symbol. This is called in adjust_reloc_syms; |
| 2794 | it is used to remove *ABS* references from the symbol table. */ |
| 2795 | int |
| 2796 | nios2_frob_symbol (symbolS *symp) |
| 2797 | { |
| 2798 | if ((OUTPUT_FLAVOR == bfd_target_elf_flavour |
| 2799 | && symp == section_symbol (absolute_section)) |
| 2800 | || !S_IS_DEFINED (symp)) |
| 2801 | return 1; |
| 2802 | else |
| 2803 | return 0; |
| 2804 | } |
| 2805 | |
| 2806 | /* The function tc_gen_reloc creates a relocation structure for the |
| 2807 | fixup fixp, and returns a pointer to it. This structure is passed |
| 2808 | to bfd_install_relocation so that it can be written to the object |
| 2809 | file for linking. */ |
| 2810 | arelent * |
| 2811 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp) |
| 2812 | { |
| 2813 | arelent *reloc = (arelent *) xmalloc (sizeof (arelent)); |
| 2814 | reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); |
| 2815 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); |
| 2816 | |
| 2817 | reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; |
| 2818 | reloc->addend = fixp->fx_offset; /* fixp->fx_addnumber; */ |
| 2819 | |
| 2820 | if (fixp->fx_pcrel) |
| 2821 | { |
| 2822 | switch (fixp->fx_r_type) |
| 2823 | { |
| 2824 | case BFD_RELOC_16: |
| 2825 | fixp->fx_r_type = BFD_RELOC_16_PCREL; |
| 2826 | break; |
| 2827 | case BFD_RELOC_NIOS2_LO16: |
| 2828 | fixp->fx_r_type = BFD_RELOC_NIOS2_PCREL_LO; |
| 2829 | break; |
| 2830 | case BFD_RELOC_NIOS2_HIADJ16: |
| 2831 | fixp->fx_r_type = BFD_RELOC_NIOS2_PCREL_HA; |
| 2832 | break; |
| 2833 | default: |
| 2834 | break; |
| 2835 | } |
| 2836 | } |
| 2837 | |
| 2838 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type); |
| 2839 | if (reloc->howto == NULL) |
| 2840 | { |
| 2841 | as_bad_where (fixp->fx_file, fixp->fx_line, |
| 2842 | _("can't represent relocation type %s"), |
| 2843 | bfd_get_reloc_code_name (fixp->fx_r_type)); |
| 2844 | |
| 2845 | /* Set howto to a garbage value so that we can keep going. */ |
| 2846 | reloc->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_32); |
| 2847 | gas_assert (reloc->howto != NULL); |
| 2848 | } |
| 2849 | return reloc; |
| 2850 | } |
| 2851 | |
| 2852 | long |
| 2853 | md_pcrel_from (fixS *fixP ATTRIBUTE_UNUSED) |
| 2854 | { |
| 2855 | return 0; |
| 2856 | } |
| 2857 | |
| 2858 | /* Called just before the assembler exits. */ |
| 2859 | void |
| 2860 | md_end () |
| 2861 | { |
| 2862 | /* FIXME - not yet implemented */ |
| 2863 | } |
| 2864 | |
| 2865 | /* Under ELF we need to default _GLOBAL_OFFSET_TABLE. |
| 2866 | Otherwise we have no need to default values of symbols. */ |
| 2867 | symbolS * |
| 2868 | md_undefined_symbol (char *name ATTRIBUTE_UNUSED) |
| 2869 | { |
| 2870 | #ifdef OBJ_ELF |
| 2871 | if (name[0] == '_' && name[1] == 'G' |
| 2872 | && strcmp (name, GLOBAL_OFFSET_TABLE_NAME) == 0) |
| 2873 | { |
| 2874 | if (!GOT_symbol) |
| 2875 | { |
| 2876 | if (symbol_find (name)) |
| 2877 | as_bad ("GOT already in the symbol table"); |
| 2878 | |
| 2879 | GOT_symbol = symbol_new (name, undefined_section, |
| 2880 | (valueT) 0, &zero_address_frag); |
| 2881 | } |
| 2882 | |
| 2883 | return GOT_symbol; |
| 2884 | } |
| 2885 | #endif |
| 2886 | |
| 2887 | return 0; |
| 2888 | } |
| 2889 | |
| 2890 | /* Implement tc_frob_label. */ |
| 2891 | void |
| 2892 | nios2_frob_label (symbolS *lab) |
| 2893 | { |
| 2894 | /* Emit dwarf information. */ |
| 2895 | dwarf2_emit_label (lab); |
| 2896 | |
| 2897 | /* Update the label's address with the current output pointer. */ |
| 2898 | symbol_set_frag (lab, frag_now); |
| 2899 | S_SET_VALUE (lab, (valueT) frag_now_fix ()); |
| 2900 | |
| 2901 | /* Record this label for future adjustment after we find out what |
| 2902 | kind of data it references, and the required alignment therewith. */ |
| 2903 | nios2_last_label = lab; |
| 2904 | } |
| 2905 | |
| 2906 | /* Implement md_cons_align. */ |
| 2907 | void |
| 2908 | nios2_cons_align (int size) |
| 2909 | { |
| 2910 | int log_size = 0; |
| 2911 | const char *pfill = NULL; |
| 2912 | |
| 2913 | while ((size >>= 1) != 0) |
| 2914 | ++log_size; |
| 2915 | |
| 2916 | if (subseg_text_p (now_seg)) |
| 2917 | pfill = (const char *) &nop; |
| 2918 | else |
| 2919 | pfill = NULL; |
| 2920 | |
| 2921 | if (nios2_auto_align_on) |
| 2922 | nios2_align (log_size, pfill, NULL); |
| 2923 | |
| 2924 | nios2_last_label = NULL; |
| 2925 | } |
| 2926 | |
| 2927 | /* Map 's' to SHF_NIOS2_GPREL. */ |
| 2928 | /* This is from the Alpha code tc-alpha.c. */ |
| 2929 | int |
| 2930 | nios2_elf_section_letter (int letter, char **ptr_msg) |
| 2931 | { |
| 2932 | if (letter == 's') |
| 2933 | return SHF_NIOS2_GPREL; |
| 2934 | |
| 2935 | *ptr_msg = _("Bad .section directive: want a,s,w,x,M,S,G,T in string"); |
| 2936 | return -1; |
| 2937 | } |
| 2938 | |
| 2939 | /* Map SHF_ALPHA_GPREL to SEC_SMALL_DATA. */ |
| 2940 | /* This is from the Alpha code tc-alpha.c. */ |
| 2941 | flagword |
| 2942 | nios2_elf_section_flags (flagword flags, int attr, int type ATTRIBUTE_UNUSED) |
| 2943 | { |
| 2944 | if (attr & SHF_NIOS2_GPREL) |
| 2945 | flags |= SEC_SMALL_DATA; |
| 2946 | return flags; |
| 2947 | } |
| 2948 | |
| 2949 | /* Implement TC_PARSE_CONS_EXPRESSION to handle %tls_ldo(...) */ |
| 2950 | static int nios2_tls_ldo_reloc; |
| 2951 | |
| 2952 | void |
| 2953 | nios2_cons (expressionS *exp, int size) |
| 2954 | { |
| 2955 | nios2_tls_ldo_reloc = 0; |
| 2956 | |
| 2957 | SKIP_WHITESPACE (); |
| 2958 | if (input_line_pointer[0] == '%') |
| 2959 | { |
| 2960 | if (strprefix (input_line_pointer + 1, "tls_ldo")) |
| 2961 | { |
| 2962 | if (size != 4) |
| 2963 | as_bad (_("Illegal operands: %%tls_ldo in %d-byte data field"), |
| 2964 | size); |
| 2965 | else |
| 2966 | { |
| 2967 | input_line_pointer += 8; |
| 2968 | nios2_tls_ldo_reloc = 1; |
| 2969 | } |
| 2970 | } |
| 2971 | if (nios2_tls_ldo_reloc) |
| 2972 | { |
| 2973 | SKIP_WHITESPACE (); |
| 2974 | if (input_line_pointer[0] != '(') |
| 2975 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); |
| 2976 | else |
| 2977 | { |
| 2978 | int c; |
| 2979 | char *end = ++input_line_pointer; |
| 2980 | int npar = 0; |
| 2981 | |
| 2982 | for (c = *end; !is_end_of_line[c]; end++, c = *end) |
| 2983 | if (c == '(') |
| 2984 | npar++; |
| 2985 | else if (c == ')') |
| 2986 | { |
| 2987 | if (!npar) |
| 2988 | break; |
| 2989 | npar--; |
| 2990 | } |
| 2991 | |
| 2992 | if (c != ')') |
| 2993 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); |
| 2994 | else |
| 2995 | { |
| 2996 | *end = '\0'; |
| 2997 | expression (exp); |
| 2998 | *end = c; |
| 2999 | if (input_line_pointer != end) |
| 3000 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); |
| 3001 | else |
| 3002 | { |
| 3003 | input_line_pointer++; |
| 3004 | SKIP_WHITESPACE (); |
| 3005 | c = *input_line_pointer; |
| 3006 | if (! is_end_of_line[c] && c != ',') |
| 3007 | as_bad (_("Illegal operands: garbage after %%tls_ldo()")); |
| 3008 | } |
| 3009 | } |
| 3010 | } |
| 3011 | } |
| 3012 | } |
| 3013 | if (!nios2_tls_ldo_reloc) |
| 3014 | expression (exp); |
| 3015 | } |
| 3016 | |
| 3017 | /* Implement TC_CONS_FIX_NEW. */ |
| 3018 | void |
| 3019 | nios2_cons_fix_new (fragS *frag, int where, unsigned int nbytes, |
| 3020 | expressionS *exp) |
| 3021 | { |
| 3022 | bfd_reloc_code_real_type r; |
| 3023 | |
| 3024 | r = (nbytes == 1 ? BFD_RELOC_8 |
| 3025 | : (nbytes == 2 ? BFD_RELOC_16 |
| 3026 | : (nbytes == 4 ? BFD_RELOC_32 : BFD_RELOC_64))); |
| 3027 | |
| 3028 | if (nios2_tls_ldo_reloc) |
| 3029 | r = BFD_RELOC_NIOS2_TLS_DTPREL; |
| 3030 | |
| 3031 | fix_new_exp (frag, where, (int) nbytes, exp, 0, r); |
| 3032 | nios2_tls_ldo_reloc = 0; |
| 3033 | } |
| 3034 | |
| 3035 | /* Implement HANDLE_ALIGN. */ |
| 3036 | void |
| 3037 | nios2_handle_align (fragS *fragp) |
| 3038 | { |
| 3039 | /* If we are expecting to relax in the linker, then we must output a |
| 3040 | relocation to tell the linker we are aligning code. */ |
| 3041 | if (nios2_as_options.relax == relax_all |
| 3042 | && (fragp->fr_type == rs_align || fragp->fr_type == rs_align_code) |
| 3043 | && fragp->fr_address + fragp->fr_fix > 0 |
| 3044 | && fragp->fr_offset > 1 |
| 3045 | && now_seg != bss_section) |
| 3046 | fix_new (fragp, fragp->fr_fix, 0, &abs_symbol, fragp->fr_offset, 0, |
| 3047 | BFD_RELOC_NIOS2_ALIGN); |
| 3048 | } |
| 3049 | |
| 3050 | /* Implement tc_regname_to_dw2regnum, to convert REGNAME to a DWARF-2 |
| 3051 | register number. */ |
| 3052 | int |
| 3053 | nios2_regname_to_dw2regnum (char *regname) |
| 3054 | { |
| 3055 | struct nios2_reg *r = nios2_reg_lookup (regname); |
| 3056 | if (r == NULL) |
| 3057 | return -1; |
| 3058 | return r->index; |
| 3059 | } |
| 3060 | |
| 3061 | /* Implement tc_cfi_frame_initial_instructions, to initialize the DWARF-2 |
| 3062 | unwind information for this procedure. */ |
| 3063 | void |
| 3064 | nios2_frame_initial_instructions (void) |
| 3065 | { |
| 3066 | cfi_add_CFA_def_cfa (27, 0); |
| 3067 | } |