| 1 | /* Altera Nios II assembler. |
| 2 | Copyright (C) 2012-2016 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 "libbfd.h" |
| 29 | #include "dwarf2dbg.h" |
| 30 | #include "subsegs.h" |
| 31 | #include "safe-ctype.h" |
| 32 | #include "dw2gencfi.h" |
| 33 | |
| 34 | #ifndef OBJ_ELF |
| 35 | /* We are not supporting any other target so we throw a compile time error. */ |
| 36 | OBJ_ELF not defined |
| 37 | #endif |
| 38 | |
| 39 | /* We can choose our endianness at run-time, regardless of configuration. */ |
| 40 | extern int target_big_endian; |
| 41 | |
| 42 | /* This array holds the chars that always start a comment. If the |
| 43 | pre-processor is disabled, these aren't very useful. */ |
| 44 | const char comment_chars[] = "#"; |
| 45 | |
| 46 | /* This array holds the chars that only start a comment at the beginning of |
| 47 | a line. If the line seems to have the form '# 123 filename' |
| 48 | .line and .file directives will appear in the pre-processed output. */ |
| 49 | /* Note that input_file.c hand checks for '#' at the beginning of the |
| 50 | first line of the input file. This is because the compiler outputs |
| 51 | #NO_APP at the beginning of its output. */ |
| 52 | /* Also note that C style comments are always supported. */ |
| 53 | const char line_comment_chars[] = "#"; |
| 54 | |
| 55 | /* This array holds machine specific line separator characters. */ |
| 56 | const char line_separator_chars[] = ";"; |
| 57 | |
| 58 | /* Chars that can be used to separate mant from exp in floating point nums. */ |
| 59 | const char EXP_CHARS[] = "eE"; |
| 60 | |
| 61 | /* Chars that mean this number is a floating point constant. */ |
| 62 | /* As in 0f12.456 */ |
| 63 | /* or 0d1.2345e12 */ |
| 64 | const char FLT_CHARS[] = "rRsSfFdDxXpP"; |
| 65 | |
| 66 | /* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be |
| 67 | changed in read.c. Ideally it shouldn't have to know about it at all, |
| 68 | but nothing is ideal around here. */ |
| 69 | |
| 70 | /* Machine-dependent command-line options. */ |
| 71 | |
| 72 | const char *md_shortopts = "r"; |
| 73 | |
| 74 | struct option md_longopts[] = { |
| 75 | #define OPTION_RELAX_ALL (OPTION_MD_BASE + 0) |
| 76 | {"relax-all", no_argument, NULL, OPTION_RELAX_ALL}, |
| 77 | #define OPTION_NORELAX (OPTION_MD_BASE + 1) |
| 78 | {"no-relax", no_argument, NULL, OPTION_NORELAX}, |
| 79 | #define OPTION_RELAX_SECTION (OPTION_MD_BASE + 2) |
| 80 | {"relax-section", no_argument, NULL, OPTION_RELAX_SECTION}, |
| 81 | #define OPTION_EB (OPTION_MD_BASE + 3) |
| 82 | {"EB", no_argument, NULL, OPTION_EB}, |
| 83 | #define OPTION_EL (OPTION_MD_BASE + 4) |
| 84 | {"EL", no_argument, NULL, OPTION_EL}, |
| 85 | #define OPTION_MARCH (OPTION_MD_BASE + 5) |
| 86 | {"march", required_argument, NULL, OPTION_MARCH} |
| 87 | }; |
| 88 | |
| 89 | size_t md_longopts_size = sizeof (md_longopts); |
| 90 | |
| 91 | /* The assembler supports three different relaxation modes, controlled by |
| 92 | command-line options. */ |
| 93 | typedef enum |
| 94 | { |
| 95 | relax_section = 0, |
| 96 | relax_none, |
| 97 | relax_all |
| 98 | } relax_optionT; |
| 99 | |
| 100 | /* Struct contains all assembler options set with .set. */ |
| 101 | struct |
| 102 | { |
| 103 | /* .set noat -> noat = 1 allows assembly code to use at without warning |
| 104 | and macro expansions generate a warning. |
| 105 | .set at -> noat = 0, assembly code using at warn but macro expansions |
| 106 | do not generate warnings. */ |
| 107 | bfd_boolean noat; |
| 108 | |
| 109 | /* .set nobreak -> nobreak = 1 allows assembly code to use ba,bt without |
| 110 | warning. |
| 111 | .set break -> nobreak = 0, assembly code using ba,bt warns. */ |
| 112 | bfd_boolean nobreak; |
| 113 | |
| 114 | /* .cmd line option -relax-all allows all branches and calls to be replaced |
| 115 | with longer versions. |
| 116 | -no-relax inhibits branch/call conversion. |
| 117 | The default value is relax_section, which relaxes branches within |
| 118 | a section. */ |
| 119 | relax_optionT relax; |
| 120 | |
| 121 | } nios2_as_options = {FALSE, FALSE, relax_section}; |
| 122 | |
| 123 | |
| 124 | typedef struct nios2_insn_reloc |
| 125 | { |
| 126 | /* Any expression in the instruction is parsed into this field, |
| 127 | which is passed to fix_new_exp() to generate a fixup. */ |
| 128 | expressionS reloc_expression; |
| 129 | |
| 130 | /* The type of the relocation to be applied. */ |
| 131 | bfd_reloc_code_real_type reloc_type; |
| 132 | |
| 133 | /* PC-relative. */ |
| 134 | unsigned int reloc_pcrel; |
| 135 | |
| 136 | /* The next relocation to be applied to the instruction. */ |
| 137 | struct nios2_insn_reloc *reloc_next; |
| 138 | } nios2_insn_relocS; |
| 139 | |
| 140 | /* This struct is used to hold state when assembling instructions. */ |
| 141 | typedef struct nios2_insn_info |
| 142 | { |
| 143 | /* Assembled instruction. */ |
| 144 | unsigned long insn_code; |
| 145 | |
| 146 | /* Constant bits masked into insn_code for self-check mode. */ |
| 147 | unsigned long constant_bits; |
| 148 | |
| 149 | /* Pointer to the relevant bit of the opcode table. */ |
| 150 | const struct nios2_opcode *insn_nios2_opcode; |
| 151 | /* After parsing ptrs to the tokens in the instruction fill this array |
| 152 | it is terminated with a null pointer (hence the first +1). |
| 153 | The second +1 is because in some parts of the code the opcode |
| 154 | is not counted as a token, but still placed in this array. */ |
| 155 | const char *insn_tokens[NIOS2_MAX_INSN_TOKENS + 1 + 1]; |
| 156 | |
| 157 | /* This holds information used to generate fixups |
| 158 | and eventually relocations if it is not null. */ |
| 159 | nios2_insn_relocS *insn_reloc; |
| 160 | } nios2_insn_infoS; |
| 161 | |
| 162 | |
| 163 | /* This struct is used to convert Nios II pseudo-ops into the |
| 164 | corresponding real op. */ |
| 165 | typedef struct nios2_ps_insn_info |
| 166 | { |
| 167 | /* Map this pseudo_op... */ |
| 168 | const char *pseudo_insn; |
| 169 | |
| 170 | /* ...to this real instruction. */ |
| 171 | const char *insn; |
| 172 | |
| 173 | /* Call this function to modify the operands.... */ |
| 174 | void (*arg_modifer_func) (char ** parsed_args, const char *arg, int num, |
| 175 | int start); |
| 176 | |
| 177 | /* ...with these arguments. */ |
| 178 | const char *arg_modifier; |
| 179 | int num; |
| 180 | int index; |
| 181 | |
| 182 | /* If arg_modifier_func allocates new memory, provide this function |
| 183 | to free it afterwards. */ |
| 184 | void (*arg_cleanup_func) (char **parsed_args, int num, int start); |
| 185 | } nios2_ps_insn_infoS; |
| 186 | |
| 187 | /* Opcode hash table. */ |
| 188 | static struct hash_control *nios2_opcode_hash = NULL; |
| 189 | #define nios2_opcode_lookup(NAME) \ |
| 190 | ((struct nios2_opcode *) hash_find (nios2_opcode_hash, (NAME))) |
| 191 | |
| 192 | /* Register hash table. */ |
| 193 | static struct hash_control *nios2_reg_hash = NULL; |
| 194 | #define nios2_reg_lookup(NAME) \ |
| 195 | ((struct nios2_reg *) hash_find (nios2_reg_hash, (NAME))) |
| 196 | |
| 197 | |
| 198 | /* Pseudo-op hash table. */ |
| 199 | static struct hash_control *nios2_ps_hash = NULL; |
| 200 | #define nios2_ps_lookup(NAME) \ |
| 201 | ((nios2_ps_insn_infoS *) hash_find (nios2_ps_hash, (NAME))) |
| 202 | |
| 203 | /* The known current alignment of the current section. */ |
| 204 | static int nios2_current_align; |
| 205 | static segT nios2_current_align_seg; |
| 206 | |
| 207 | static int nios2_auto_align_on = 1; |
| 208 | |
| 209 | /* The last seen label in the current section. This is used to auto-align |
| 210 | labels preceeding instructions. */ |
| 211 | static symbolS *nios2_last_label; |
| 212 | |
| 213 | /* If we saw a 16-bit CDX instruction, we can align on 2-byte boundaries |
| 214 | instead of 4-bytes. Use this to keep track of the minimum power-of-2 |
| 215 | alignment. */ |
| 216 | static int nios2_min_align = 2; |
| 217 | |
| 218 | #ifdef OBJ_ELF |
| 219 | /* Pre-defined "_GLOBAL_OFFSET_TABLE_" */ |
| 220 | symbolS *GOT_symbol; |
| 221 | #endif |
| 222 | |
| 223 | /* The processor architecture value, EF_NIOS2_ARCH_R1 by default. */ |
| 224 | static int nios2_architecture = EF_NIOS2_ARCH_R1; |
| 225 | |
| 226 | \f |
| 227 | /** Utility routines. */ |
| 228 | /* Function md_chars_to_number takes the sequence of |
| 229 | bytes in buf and returns the corresponding value |
| 230 | in an int. n must be 1, 2 or 4. */ |
| 231 | static valueT |
| 232 | md_chars_to_number (char *buf, int n) |
| 233 | { |
| 234 | int i; |
| 235 | valueT val; |
| 236 | |
| 237 | gas_assert (n == 1 || n == 2 || n == 4); |
| 238 | |
| 239 | val = 0; |
| 240 | if (target_big_endian) |
| 241 | for (i = 0; i < n; ++i) |
| 242 | val = val | ((buf[i] & 0xff) << 8 * (n - (i + 1))); |
| 243 | else |
| 244 | for (i = 0; i < n; ++i) |
| 245 | val = val | ((buf[i] & 0xff) << 8 * i); |
| 246 | return val; |
| 247 | } |
| 248 | |
| 249 | |
| 250 | /* This function turns a C long int, short int or char |
| 251 | into the series of bytes that represent the number |
| 252 | on the target machine. */ |
| 253 | void |
| 254 | md_number_to_chars (char *buf, valueT val, int n) |
| 255 | { |
| 256 | gas_assert (n == 1 || n == 2 || n == 4 || n == 8); |
| 257 | if (target_big_endian) |
| 258 | number_to_chars_bigendian (buf, val, n); |
| 259 | else |
| 260 | number_to_chars_littleendian (buf, val, n); |
| 261 | } |
| 262 | |
| 263 | /* Turn a string in input_line_pointer into a floating point constant |
| 264 | of type TYPE, and store the appropriate bytes in *LITP. The number |
| 265 | of LITTLENUMS emitted is stored in *SIZEP. An error message is |
| 266 | returned, or NULL on OK. */ |
| 267 | char * |
| 268 | md_atof (int type, char *litP, int *sizeP) |
| 269 | { |
| 270 | int prec; |
| 271 | LITTLENUM_TYPE words[4]; |
| 272 | char *t; |
| 273 | int i; |
| 274 | |
| 275 | switch (type) |
| 276 | { |
| 277 | case 'f': |
| 278 | prec = 2; |
| 279 | break; |
| 280 | case 'd': |
| 281 | prec = 4; |
| 282 | break; |
| 283 | default: |
| 284 | *sizeP = 0; |
| 285 | return _("bad call to md_atof"); |
| 286 | } |
| 287 | |
| 288 | t = atof_ieee (input_line_pointer, type, words); |
| 289 | if (t) |
| 290 | input_line_pointer = t; |
| 291 | |
| 292 | *sizeP = prec * 2; |
| 293 | |
| 294 | if (! target_big_endian) |
| 295 | for (i = prec - 1; i >= 0; i--, litP += 2) |
| 296 | md_number_to_chars (litP, (valueT) words[i], 2); |
| 297 | else |
| 298 | for (i = 0; i < prec; i++, litP += 2) |
| 299 | md_number_to_chars (litP, (valueT) words[i], 2); |
| 300 | |
| 301 | return NULL; |
| 302 | } |
| 303 | |
| 304 | /* Return true if STR starts with PREFIX, which should be a string literal. */ |
| 305 | #define strprefix(STR, PREFIX) \ |
| 306 | (strncmp ((STR), PREFIX, strlen (PREFIX)) == 0) |
| 307 | |
| 308 | |
| 309 | /* Return true if STR is prefixed with a special relocation operator. */ |
| 310 | static int |
| 311 | nios2_special_relocation_p (const char *str) |
| 312 | { |
| 313 | return (strprefix (str, "%lo") |
| 314 | || strprefix (str, "%hi") |
| 315 | || strprefix (str, "%hiadj") |
| 316 | || strprefix (str, "%gprel") |
| 317 | || strprefix (str, "%got") |
| 318 | || strprefix (str, "%call") |
| 319 | || strprefix (str, "%gotoff_lo") |
| 320 | || strprefix (str, "%gotoff_hiadj") |
| 321 | || strprefix (str, "%tls_gd") |
| 322 | || strprefix (str, "%tls_ldm") |
| 323 | || strprefix (str, "%tls_ldo") |
| 324 | || strprefix (str, "%tls_ie") |
| 325 | || strprefix (str, "%tls_le") |
| 326 | || strprefix (str, "%gotoff")); |
| 327 | } |
| 328 | |
| 329 | |
| 330 | /* nop fill patterns for text section. */ |
| 331 | static char const nop_r1[4] = { 0x3a, 0x88, 0x01, 0x00 }; |
| 332 | static char const nop_r2[4] = { 0x20, 0x00, 0x00, 0xc4 }; |
| 333 | static char const nop_r2_cdx[2] = { 0x3b, 0x00 }; |
| 334 | static char const *nop32 = nop_r1; |
| 335 | static char const *nop16 = NULL; |
| 336 | |
| 337 | /* Handles all machine-dependent alignment needs. */ |
| 338 | static void |
| 339 | nios2_align (int log_size, const char *pfill, symbolS *label) |
| 340 | { |
| 341 | int align; |
| 342 | long max_alignment = 15; |
| 343 | |
| 344 | /* The front end is prone to changing segments out from under us |
| 345 | temporarily when -g is in effect. */ |
| 346 | int switched_seg_p = (nios2_current_align_seg != now_seg); |
| 347 | |
| 348 | align = log_size; |
| 349 | if (align > max_alignment) |
| 350 | { |
| 351 | align = max_alignment; |
| 352 | as_bad (_("Alignment too large: %d. assumed"), align); |
| 353 | } |
| 354 | else if (align < 0) |
| 355 | { |
| 356 | as_warn (_("Alignment negative: 0 assumed")); |
| 357 | align = 0; |
| 358 | } |
| 359 | |
| 360 | if (align != 0) |
| 361 | { |
| 362 | if (subseg_text_p (now_seg) && align >= nios2_min_align) |
| 363 | { |
| 364 | /* First, make sure we're on the minimum boundary, in case |
| 365 | someone has been putting .byte values the text section. */ |
| 366 | if (nios2_current_align < nios2_min_align || switched_seg_p) |
| 367 | frag_align (nios2_min_align, 0, 0); |
| 368 | |
| 369 | /* If we might be on a 2-byte boundary, first align to a |
| 370 | 4-byte boundary using the 2-byte nop as fill. */ |
| 371 | if (nios2_min_align == 1 |
| 372 | && align > nios2_min_align |
| 373 | && pfill == nop32 ) |
| 374 | { |
| 375 | gas_assert (nop16); |
| 376 | frag_align_pattern (2, nop16, 2, 0); |
| 377 | } |
| 378 | |
| 379 | /* Now fill in the alignment pattern. */ |
| 380 | if (pfill != NULL) |
| 381 | frag_align_pattern (align, pfill, 4, 0); |
| 382 | else |
| 383 | frag_align (align, 0, 0); |
| 384 | } |
| 385 | else |
| 386 | frag_align (align, 0, 0); |
| 387 | |
| 388 | if (!switched_seg_p) |
| 389 | nios2_current_align = align; |
| 390 | |
| 391 | /* If the last label was in a different section we can't align it. */ |
| 392 | if (label != NULL && !switched_seg_p) |
| 393 | { |
| 394 | symbolS *sym; |
| 395 | int label_seen = FALSE; |
| 396 | struct frag *old_frag; |
| 397 | valueT old_value; |
| 398 | valueT new_value; |
| 399 | |
| 400 | gas_assert (S_GET_SEGMENT (label) == now_seg); |
| 401 | |
| 402 | old_frag = symbol_get_frag (label); |
| 403 | old_value = S_GET_VALUE (label); |
| 404 | new_value = (valueT) frag_now_fix (); |
| 405 | |
| 406 | /* It is possible to have more than one label at a particular |
| 407 | address, especially if debugging is enabled, so we must |
| 408 | take care to adjust all the labels at this address in this |
| 409 | fragment. To save time we search from the end of the symbol |
| 410 | list, backwards, since the symbols we are interested in are |
| 411 | almost certainly the ones that were most recently added. |
| 412 | Also to save time we stop searching once we have seen at least |
| 413 | one matching label, and we encounter a label that is no longer |
| 414 | in the target fragment. Note, this search is guaranteed to |
| 415 | find at least one match when sym == label, so no special case |
| 416 | code is necessary. */ |
| 417 | for (sym = symbol_lastP; sym != NULL; sym = symbol_previous (sym)) |
| 418 | if (symbol_get_frag (sym) == old_frag |
| 419 | && S_GET_VALUE (sym) == old_value) |
| 420 | { |
| 421 | label_seen = TRUE; |
| 422 | symbol_set_frag (sym, frag_now); |
| 423 | S_SET_VALUE (sym, new_value); |
| 424 | } |
| 425 | else if (label_seen && symbol_get_frag (sym) != old_frag) |
| 426 | break; |
| 427 | } |
| 428 | record_alignment (now_seg, align); |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | \f |
| 433 | /** Support for self-check mode. */ |
| 434 | |
| 435 | /* Mode of the assembler. */ |
| 436 | typedef enum |
| 437 | { |
| 438 | NIOS2_MODE_ASSEMBLE, /* Ordinary operation. */ |
| 439 | NIOS2_MODE_TEST /* Hidden mode used for self testing. */ |
| 440 | } NIOS2_MODE; |
| 441 | |
| 442 | static NIOS2_MODE nios2_mode = NIOS2_MODE_ASSEMBLE; |
| 443 | |
| 444 | /* This function is used to in self-checking mode |
| 445 | to check the assembled instruction |
| 446 | opcode should be the assembled opcode, and exp_opcode |
| 447 | the parsed string representing the expected opcode. */ |
| 448 | static void |
| 449 | nios2_check_assembly (unsigned int opcode, const char *exp_opcode) |
| 450 | { |
| 451 | if (nios2_mode == NIOS2_MODE_TEST) |
| 452 | { |
| 453 | if (exp_opcode == NULL) |
| 454 | as_bad (_("expecting opcode string in self test mode")); |
| 455 | else if (opcode != strtoul (exp_opcode, NULL, 16)) |
| 456 | as_bad (_("assembly 0x%08x, expected %s"), opcode, exp_opcode); |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | \f |
| 461 | /** Support for machine-dependent assembler directives. */ |
| 462 | /* Handle the .align pseudo-op. This aligns to a power of two. It |
| 463 | also adjusts any current instruction label. We treat this the same |
| 464 | way the MIPS port does: .align 0 turns off auto alignment. */ |
| 465 | static void |
| 466 | s_nios2_align (int ignore ATTRIBUTE_UNUSED) |
| 467 | { |
| 468 | int align; |
| 469 | char fill; |
| 470 | const char *pfill = NULL; |
| 471 | long max_alignment = 15; |
| 472 | |
| 473 | align = get_absolute_expression (); |
| 474 | if (align > max_alignment) |
| 475 | { |
| 476 | align = max_alignment; |
| 477 | as_bad (_("Alignment too large: %d. assumed"), align); |
| 478 | } |
| 479 | else if (align < 0) |
| 480 | { |
| 481 | as_warn (_("Alignment negative: 0 assumed")); |
| 482 | align = 0; |
| 483 | } |
| 484 | |
| 485 | if (*input_line_pointer == ',') |
| 486 | { |
| 487 | input_line_pointer++; |
| 488 | fill = get_absolute_expression (); |
| 489 | pfill = (const char *) &fill; |
| 490 | } |
| 491 | else if (subseg_text_p (now_seg)) |
| 492 | pfill = (const char *) nop32; |
| 493 | else |
| 494 | { |
| 495 | pfill = NULL; |
| 496 | nios2_last_label = NULL; |
| 497 | } |
| 498 | |
| 499 | if (align != 0) |
| 500 | { |
| 501 | nios2_auto_align_on = 1; |
| 502 | nios2_align (align, pfill, nios2_last_label); |
| 503 | nios2_last_label = NULL; |
| 504 | } |
| 505 | else |
| 506 | nios2_auto_align_on = 0; |
| 507 | |
| 508 | demand_empty_rest_of_line (); |
| 509 | } |
| 510 | |
| 511 | /* Handle the .text pseudo-op. This is like the usual one, but it |
| 512 | clears the saved last label and resets known alignment. */ |
| 513 | static void |
| 514 | s_nios2_text (int i) |
| 515 | { |
| 516 | s_text (i); |
| 517 | nios2_last_label = NULL; |
| 518 | nios2_current_align = 0; |
| 519 | nios2_current_align_seg = now_seg; |
| 520 | } |
| 521 | |
| 522 | /* Handle the .data pseudo-op. This is like the usual one, but it |
| 523 | clears the saved last label and resets known alignment. */ |
| 524 | static void |
| 525 | s_nios2_data (int i) |
| 526 | { |
| 527 | s_data (i); |
| 528 | nios2_last_label = NULL; |
| 529 | nios2_current_align = 0; |
| 530 | nios2_current_align_seg = now_seg; |
| 531 | } |
| 532 | |
| 533 | /* Handle the .section pseudo-op. This is like the usual one, but it |
| 534 | clears the saved last label and resets known alignment. */ |
| 535 | static void |
| 536 | s_nios2_section (int ignore) |
| 537 | { |
| 538 | obj_elf_section (ignore); |
| 539 | nios2_last_label = NULL; |
| 540 | nios2_current_align = 0; |
| 541 | nios2_current_align_seg = now_seg; |
| 542 | } |
| 543 | |
| 544 | /* Explicitly unaligned cons. */ |
| 545 | static void |
| 546 | s_nios2_ucons (int nbytes) |
| 547 | { |
| 548 | int hold; |
| 549 | hold = nios2_auto_align_on; |
| 550 | nios2_auto_align_on = 0; |
| 551 | cons (nbytes); |
| 552 | nios2_auto_align_on = hold; |
| 553 | } |
| 554 | |
| 555 | /* Handle the .sdata directive. */ |
| 556 | static void |
| 557 | s_nios2_sdata (int ignore ATTRIBUTE_UNUSED) |
| 558 | { |
| 559 | get_absolute_expression (); /* Ignored. */ |
| 560 | subseg_new (".sdata", 0); |
| 561 | demand_empty_rest_of_line (); |
| 562 | } |
| 563 | |
| 564 | /* .set sets assembler options eg noat/at and is also used |
| 565 | to set symbol values (.equ, .equiv ). */ |
| 566 | static void |
| 567 | s_nios2_set (int equiv) |
| 568 | { |
| 569 | char *save = input_line_pointer; |
| 570 | char *directive; |
| 571 | char delim = get_symbol_name (&directive); |
| 572 | char *endline = input_line_pointer; |
| 573 | |
| 574 | (void) restore_line_pointer (delim); |
| 575 | |
| 576 | /* We only want to handle ".set XXX" if the |
| 577 | user has tried ".set XXX, YYY" they are not |
| 578 | trying a directive. This prevents |
| 579 | us from polluting the name space. */ |
| 580 | SKIP_WHITESPACE (); |
| 581 | if (is_end_of_line[(unsigned char) *input_line_pointer]) |
| 582 | { |
| 583 | bfd_boolean done = TRUE; |
| 584 | *endline = 0; |
| 585 | |
| 586 | if (!strcmp (directive, "noat")) |
| 587 | nios2_as_options.noat = TRUE; |
| 588 | else if (!strcmp (directive, "at")) |
| 589 | nios2_as_options.noat = FALSE; |
| 590 | else if (!strcmp (directive, "nobreak")) |
| 591 | nios2_as_options.nobreak = TRUE; |
| 592 | else if (!strcmp (directive, "break")) |
| 593 | nios2_as_options.nobreak = FALSE; |
| 594 | else if (!strcmp (directive, "norelax")) |
| 595 | nios2_as_options.relax = relax_none; |
| 596 | else if (!strcmp (directive, "relaxsection")) |
| 597 | nios2_as_options.relax = relax_section; |
| 598 | else if (!strcmp (directive, "relaxall")) |
| 599 | nios2_as_options.relax = relax_all; |
| 600 | else |
| 601 | done = FALSE; |
| 602 | |
| 603 | if (done) |
| 604 | { |
| 605 | *endline = delim; |
| 606 | demand_empty_rest_of_line (); |
| 607 | return; |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | /* If we fall through to here, either we have ".set XXX, YYY" |
| 612 | or we have ".set XXX" where XXX is unknown or we have |
| 613 | a syntax error. */ |
| 614 | input_line_pointer = save; |
| 615 | s_set (equiv); |
| 616 | } |
| 617 | |
| 618 | /* Machine-dependent assembler directives. |
| 619 | Format of each entry is: |
| 620 | { "directive", handler_func, param } */ |
| 621 | const pseudo_typeS md_pseudo_table[] = { |
| 622 | {"align", s_nios2_align, 0}, |
| 623 | {"text", s_nios2_text, 0}, |
| 624 | {"data", s_nios2_data, 0}, |
| 625 | {"section", s_nios2_section, 0}, |
| 626 | {"section.s", s_nios2_section, 0}, |
| 627 | {"sect", s_nios2_section, 0}, |
| 628 | {"sect.s", s_nios2_section, 0}, |
| 629 | /* .dword and .half are included for compatibility with MIPS. */ |
| 630 | {"dword", cons, 8}, |
| 631 | {"half", cons, 2}, |
| 632 | /* NIOS2 native word size is 4 bytes, so we override |
| 633 | the GAS default of 2. */ |
| 634 | {"word", cons, 4}, |
| 635 | /* Explicitly unaligned directives. */ |
| 636 | {"2byte", s_nios2_ucons, 2}, |
| 637 | {"4byte", s_nios2_ucons, 4}, |
| 638 | {"8byte", s_nios2_ucons, 8}, |
| 639 | {"16byte", s_nios2_ucons, 16}, |
| 640 | #ifdef OBJ_ELF |
| 641 | {"sdata", s_nios2_sdata, 0}, |
| 642 | #endif |
| 643 | {"set", s_nios2_set, 0}, |
| 644 | {NULL, NULL, 0} |
| 645 | }; |
| 646 | |
| 647 | \f |
| 648 | /** Relaxation support. */ |
| 649 | |
| 650 | /* We support two relaxation modes: a limited PC-relative mode with |
| 651 | -relax-section (the default), and an absolute jump mode with -relax-all. |
| 652 | |
| 653 | Nios II PC-relative branch instructions only support 16-bit offsets. |
| 654 | And, there's no good way to add a 32-bit constant to the PC without |
| 655 | using two registers. |
| 656 | |
| 657 | To deal with this, for the pc-relative relaxation mode we convert |
| 658 | br label |
| 659 | into a series of 16-bit adds, like: |
| 660 | nextpc at |
| 661 | addi at, at, 32767 |
| 662 | ... |
| 663 | addi at, at, remainder |
| 664 | jmp at |
| 665 | |
| 666 | Similarly, conditional branches are converted from |
| 667 | b(condition) r, s, label |
| 668 | into a series like: |
| 669 | b(opposite condition) r, s, skip |
| 670 | nextpc at |
| 671 | addi at, at, 32767 |
| 672 | ... |
| 673 | addi at, at, remainder |
| 674 | jmp at |
| 675 | skip: |
| 676 | |
| 677 | The compiler can do a better job, either by converting the branch |
| 678 | directly into a JMP (going through the GOT for PIC) or by allocating |
| 679 | a second register for the 32-bit displacement. |
| 680 | |
| 681 | For the -relax-all relaxation mode, the conversions are |
| 682 | movhi at, %hi(symbol+offset) |
| 683 | ori at, %lo(symbol+offset) |
| 684 | jmp at |
| 685 | and |
| 686 | b(opposite condition), r, s, skip |
| 687 | movhi at, %hi(symbol+offset) |
| 688 | ori at, %lo(symbol+offset) |
| 689 | jmp at |
| 690 | skip: |
| 691 | respectively. |
| 692 | |
| 693 | 16-bit CDX branch instructions are relaxed first into equivalent |
| 694 | 32-bit branches and then the above transformations are applied |
| 695 | if necessary. |
| 696 | |
| 697 | */ |
| 698 | |
| 699 | /* Arbitrarily limit the number of addis we can insert; we need to be able |
| 700 | to specify the maximum growth size for each frag that contains a |
| 701 | relaxable branch. There's no point in specifying a huge number here |
| 702 | since that means the assembler needs to allocate that much extra |
| 703 | memory for every branch, and almost no real code will ever need it. |
| 704 | Plus, as already noted a better solution is to just use a jmp, or |
| 705 | allocate a second register to hold a 32-bit displacement. |
| 706 | FIXME: Rather than making this a constant, it could be controlled by |
| 707 | a command-line argument. */ |
| 708 | #define RELAX_MAX_ADDI 32 |
| 709 | |
| 710 | /* The fr_subtype field represents the target-specific relocation state. |
| 711 | It has type relax_substateT (unsigned int). We use it to track the |
| 712 | number of addis necessary, plus a bit to track whether this is a |
| 713 | conditional branch and a bit for 16-bit CDX instructions. |
| 714 | Regardless of the smaller RELAX_MAX_ADDI limit, we reserve 16 bits |
| 715 | in the fr_subtype to encode the number of addis so that the whole |
| 716 | theoretically-valid range is representable. |
| 717 | For the -relax-all mode, N = 0 represents an in-range branch and N = 1 |
| 718 | represents a branch that needs to be relaxed. */ |
| 719 | #define UBRANCH (0 << 16) |
| 720 | #define CBRANCH (1 << 16) |
| 721 | #define CDXBRANCH (1 << 17) |
| 722 | #define IS_CBRANCH(SUBTYPE) ((SUBTYPE) & CBRANCH) |
| 723 | #define IS_UBRANCH(SUBTYPE) (!IS_CBRANCH (SUBTYPE)) |
| 724 | #define IS_CDXBRANCH(SUBTYPE) ((SUBTYPE) & CDXBRANCH) |
| 725 | #define UBRANCH_SUBTYPE(N) (UBRANCH | (N)) |
| 726 | #define CBRANCH_SUBTYPE(N) (CBRANCH | (N)) |
| 727 | #define CDX_UBRANCH_SUBTYPE(N) (CDXBRANCH | UBRANCH | (N)) |
| 728 | #define CDX_CBRANCH_SUBTYPE(N) (CDXBRANCH | CBRANCH | (N)) |
| 729 | #define SUBTYPE_ADDIS(SUBTYPE) ((SUBTYPE) & 0xffff) |
| 730 | |
| 731 | /* For the -relax-section mode, unconditional branches require 2 extra i |
| 732 | nstructions besides the addis, conditional branches require 3. */ |
| 733 | #define UBRANCH_ADDIS_TO_SIZE(N) (((N) + 2) * 4) |
| 734 | #define CBRANCH_ADDIS_TO_SIZE(N) (((N) + 3) * 4) |
| 735 | |
| 736 | /* For the -relax-all mode, unconditional branches require 3 instructions |
| 737 | and conditional branches require 4. */ |
| 738 | #define UBRANCH_JUMP_SIZE 12 |
| 739 | #define CBRANCH_JUMP_SIZE 16 |
| 740 | |
| 741 | /* Maximum sizes of relaxation sequences. */ |
| 742 | #define UBRANCH_MAX_SIZE \ |
| 743 | (nios2_as_options.relax == relax_all \ |
| 744 | ? UBRANCH_JUMP_SIZE \ |
| 745 | : UBRANCH_ADDIS_TO_SIZE (RELAX_MAX_ADDI)) |
| 746 | #define CBRANCH_MAX_SIZE \ |
| 747 | (nios2_as_options.relax == relax_all \ |
| 748 | ? CBRANCH_JUMP_SIZE \ |
| 749 | : CBRANCH_ADDIS_TO_SIZE (RELAX_MAX_ADDI)) |
| 750 | |
| 751 | /* Register number of AT, the assembler temporary. */ |
| 752 | #define AT_REGNUM 1 |
| 753 | |
| 754 | /* Determine how many bytes are required to represent the sequence |
| 755 | indicated by SUBTYPE. */ |
| 756 | static int |
| 757 | nios2_relax_subtype_size (relax_substateT subtype) |
| 758 | { |
| 759 | int n = SUBTYPE_ADDIS (subtype); |
| 760 | if (n == 0) |
| 761 | /* Regular conditional/unconditional branch instruction. */ |
| 762 | return (IS_CDXBRANCH (subtype) ? 2 : 4); |
| 763 | else if (nios2_as_options.relax == relax_all) |
| 764 | return (IS_CBRANCH (subtype) ? CBRANCH_JUMP_SIZE : UBRANCH_JUMP_SIZE); |
| 765 | else if (IS_CBRANCH (subtype)) |
| 766 | return CBRANCH_ADDIS_TO_SIZE (n); |
| 767 | else |
| 768 | return UBRANCH_ADDIS_TO_SIZE (n); |
| 769 | } |
| 770 | |
| 771 | /* Estimate size of fragp before relaxation. |
| 772 | This could also examine the offset in fragp and adjust |
| 773 | fragp->fr_subtype, but we will do that in nios2_relax_frag anyway. */ |
| 774 | int |
| 775 | md_estimate_size_before_relax (fragS *fragp, segT segment ATTRIBUTE_UNUSED) |
| 776 | { |
| 777 | return nios2_relax_subtype_size (fragp->fr_subtype); |
| 778 | } |
| 779 | |
| 780 | /* Implement md_relax_frag, returning the change in size of the frag. */ |
| 781 | long |
| 782 | nios2_relax_frag (segT segment, fragS *fragp, long stretch) |
| 783 | { |
| 784 | addressT target = fragp->fr_offset; |
| 785 | relax_substateT subtype = fragp->fr_subtype; |
| 786 | symbolS *symbolp = fragp->fr_symbol; |
| 787 | |
| 788 | if (symbolp) |
| 789 | { |
| 790 | fragS *sym_frag = symbol_get_frag (symbolp); |
| 791 | offsetT offset; |
| 792 | int n; |
| 793 | bfd_boolean is_cdx = FALSE; |
| 794 | |
| 795 | target += S_GET_VALUE (symbolp); |
| 796 | |
| 797 | /* See comments in write.c:relax_frag about handling of stretch. */ |
| 798 | if (stretch != 0 |
| 799 | && sym_frag->relax_marker != fragp->relax_marker) |
| 800 | { |
| 801 | if (stretch < 0 || sym_frag->region == fragp->region) |
| 802 | target += stretch; |
| 803 | else if (target < fragp->fr_address) |
| 804 | target = fragp->fr_next->fr_address + stretch; |
| 805 | } |
| 806 | |
| 807 | /* We subtract fr_var (4 for 32-bit insns) because all pc relative |
| 808 | branches are from the next instruction. */ |
| 809 | offset = target - fragp->fr_address - fragp->fr_fix - fragp->fr_var; |
| 810 | if (IS_CDXBRANCH (subtype) && IS_UBRANCH (subtype) |
| 811 | && offset >= -1024 && offset < 1024) |
| 812 | /* PC-relative CDX branch with 11-bit offset. */ |
| 813 | is_cdx = TRUE; |
| 814 | else if (IS_CDXBRANCH (subtype) && IS_CBRANCH (subtype) |
| 815 | && offset >= -128 && offset < 128) |
| 816 | /* PC-relative CDX branch with 8-bit offset. */ |
| 817 | is_cdx = TRUE; |
| 818 | else if (offset >= -32768 && offset < 32768) |
| 819 | /* Fits in PC-relative branch. */ |
| 820 | n = 0; |
| 821 | else if (nios2_as_options.relax == relax_all) |
| 822 | /* Convert to jump. */ |
| 823 | n = 1; |
| 824 | else if (nios2_as_options.relax == relax_section |
| 825 | && S_GET_SEGMENT (symbolp) == segment |
| 826 | && S_IS_DEFINED (symbolp)) |
| 827 | /* Attempt a PC-relative relaxation on a branch to a defined |
| 828 | symbol in the same segment. */ |
| 829 | { |
| 830 | /* The relaxation for conditional branches is offset by 4 |
| 831 | bytes because we insert the inverted branch around the |
| 832 | sequence. */ |
| 833 | if (IS_CBRANCH (subtype)) |
| 834 | offset = offset - 4; |
| 835 | if (offset > 0) |
| 836 | n = offset / 32767 + 1; |
| 837 | else |
| 838 | n = offset / -32768 + 1; |
| 839 | |
| 840 | /* Bail out immediately if relaxation has failed. If we try to |
| 841 | defer the diagnostic to md_convert_frag, some pathological test |
| 842 | cases (e.g. gcc/testsuite/gcc.c-torture/compile/20001226-1.c) |
| 843 | apparently never converge. By returning 0 here we could pretend |
| 844 | to the caller that nothing has changed, but that leaves things |
| 845 | in an inconsistent state when we get to md_convert_frag. */ |
| 846 | if (n > RELAX_MAX_ADDI) |
| 847 | { |
| 848 | as_bad_where (fragp->fr_file, fragp->fr_line, |
| 849 | _("branch offset out of range\n")); |
| 850 | as_fatal (_("branch relaxation failed\n")); |
| 851 | } |
| 852 | } |
| 853 | else |
| 854 | /* We cannot handle this case, diagnose overflow later. */ |
| 855 | return 0; |
| 856 | |
| 857 | if (is_cdx) |
| 858 | fragp->fr_subtype = subtype; |
| 859 | else if (IS_CBRANCH (subtype)) |
| 860 | fragp->fr_subtype = CBRANCH_SUBTYPE (n); |
| 861 | else |
| 862 | fragp->fr_subtype = UBRANCH_SUBTYPE (n); |
| 863 | |
| 864 | return (nios2_relax_subtype_size (fragp->fr_subtype) |
| 865 | - nios2_relax_subtype_size (subtype)); |
| 866 | } |
| 867 | |
| 868 | /* If we got here, it's probably an error. */ |
| 869 | return 0; |
| 870 | } |
| 871 | |
| 872 | |
| 873 | /* Complete fragp using the data from the relaxation pass. */ |
| 874 | void |
| 875 | md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED, |
| 876 | fragS *fragp) |
| 877 | { |
| 878 | char *buffer = fragp->fr_literal + fragp->fr_fix; |
| 879 | relax_substateT subtype = fragp->fr_subtype; |
| 880 | int n = SUBTYPE_ADDIS (subtype); |
| 881 | addressT target = fragp->fr_offset; |
| 882 | symbolS *symbolp = fragp->fr_symbol; |
| 883 | offsetT offset; |
| 884 | unsigned int addend_mask, addi_mask, op; |
| 885 | offsetT addend, remainder; |
| 886 | int i; |
| 887 | bfd_boolean is_r2 = (bfd_get_mach (stdoutput) == bfd_mach_nios2r2); |
| 888 | |
| 889 | /* If this is a CDX branch we're not relaxing, just generate the fixup. */ |
| 890 | if (IS_CDXBRANCH (subtype)) |
| 891 | { |
| 892 | gas_assert (is_r2); |
| 893 | fix_new (fragp, fragp->fr_fix, 2, fragp->fr_symbol, |
| 894 | fragp->fr_offset, 1, |
| 895 | (IS_UBRANCH (subtype) |
| 896 | ? BFD_RELOC_NIOS2_R2_I10_1_PCREL |
| 897 | : BFD_RELOC_NIOS2_R2_T1I7_1_PCREL)); |
| 898 | fragp->fr_fix += 2; |
| 899 | return; |
| 900 | } |
| 901 | |
| 902 | /* If this is a CDX branch we are relaxing, turn it into an equivalent |
| 903 | 32-bit branch and then fall through to the normal non-CDX cases. */ |
| 904 | if (fragp->fr_var == 2) |
| 905 | { |
| 906 | unsigned int opcode = md_chars_to_number (buffer, 2); |
| 907 | gas_assert (is_r2); |
| 908 | if (IS_CBRANCH (subtype)) |
| 909 | { |
| 910 | unsigned int reg = nios2_r2_reg3_mappings[GET_IW_T1I7_A3 (opcode)]; |
| 911 | if (GET_IW_R2_OP (opcode) == R2_OP_BNEZ_N) |
| 912 | opcode = MATCH_R2_BNE | SET_IW_F2I16_A (reg); |
| 913 | else |
| 914 | opcode = MATCH_R2_BEQ | SET_IW_F2I16_A (reg); |
| 915 | } |
| 916 | else |
| 917 | opcode = MATCH_R2_BR; |
| 918 | md_number_to_chars (buffer, opcode, 4); |
| 919 | fragp->fr_var = 4; |
| 920 | } |
| 921 | |
| 922 | /* If we didn't or can't relax, this is a regular branch instruction. |
| 923 | We just need to generate the fixup for the symbol and offset. */ |
| 924 | if (n == 0) |
| 925 | { |
| 926 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, |
| 927 | fragp->fr_offset, 1, BFD_RELOC_16_PCREL); |
| 928 | fragp->fr_fix += 4; |
| 929 | return; |
| 930 | } |
| 931 | |
| 932 | /* Replace the cbranch at fr_fix with one that has the opposite condition |
| 933 | in order to jump around the block of instructions we'll be adding. */ |
| 934 | if (IS_CBRANCH (subtype)) |
| 935 | { |
| 936 | unsigned int br_opcode; |
| 937 | unsigned int old_op, new_op; |
| 938 | int nbytes; |
| 939 | |
| 940 | /* Account for the nextpc and jmp in the pc-relative case, or the two |
| 941 | load instructions and jump in the absolute case. */ |
| 942 | if (nios2_as_options.relax == relax_section) |
| 943 | nbytes = (n + 2) * 4; |
| 944 | else |
| 945 | nbytes = 12; |
| 946 | |
| 947 | br_opcode = md_chars_to_number (buffer, 4); |
| 948 | if (is_r2) |
| 949 | { |
| 950 | old_op = GET_IW_R2_OP (br_opcode); |
| 951 | switch (old_op) |
| 952 | { |
| 953 | case R2_OP_BEQ: |
| 954 | new_op = R2_OP_BNE; |
| 955 | break; |
| 956 | case R2_OP_BNE: |
| 957 | new_op = R2_OP_BEQ; |
| 958 | break; |
| 959 | case R2_OP_BGE: |
| 960 | new_op = R2_OP_BLT; |
| 961 | break; |
| 962 | case R2_OP_BGEU: |
| 963 | new_op = R2_OP_BLTU; |
| 964 | break; |
| 965 | case R2_OP_BLT: |
| 966 | new_op = R2_OP_BGE; |
| 967 | break; |
| 968 | case R2_OP_BLTU: |
| 969 | new_op = R2_OP_BGEU; |
| 970 | break; |
| 971 | default: |
| 972 | abort (); |
| 973 | } |
| 974 | br_opcode = ((br_opcode & ~IW_R2_OP_SHIFTED_MASK) |
| 975 | | SET_IW_R2_OP (new_op)); |
| 976 | br_opcode = br_opcode | SET_IW_F2I16_IMM16 (nbytes); |
| 977 | } |
| 978 | else |
| 979 | { |
| 980 | old_op = GET_IW_R1_OP (br_opcode); |
| 981 | switch (old_op) |
| 982 | { |
| 983 | case R1_OP_BEQ: |
| 984 | new_op = R1_OP_BNE; |
| 985 | break; |
| 986 | case R1_OP_BNE: |
| 987 | new_op = R1_OP_BEQ; |
| 988 | break; |
| 989 | case R1_OP_BGE: |
| 990 | new_op = R1_OP_BLT; |
| 991 | break; |
| 992 | case R1_OP_BGEU: |
| 993 | new_op = R1_OP_BLTU; |
| 994 | break; |
| 995 | case R1_OP_BLT: |
| 996 | new_op = R1_OP_BGE; |
| 997 | break; |
| 998 | case R1_OP_BLTU: |
| 999 | new_op = R1_OP_BGEU; |
| 1000 | break; |
| 1001 | default: |
| 1002 | abort (); |
| 1003 | } |
| 1004 | br_opcode = ((br_opcode & ~IW_R1_OP_SHIFTED_MASK) |
| 1005 | | SET_IW_R1_OP (new_op)); |
| 1006 | br_opcode = br_opcode | SET_IW_I_IMM16 (nbytes); |
| 1007 | } |
| 1008 | md_number_to_chars (buffer, br_opcode, 4); |
| 1009 | fragp->fr_fix += 4; |
| 1010 | buffer += 4; |
| 1011 | } |
| 1012 | |
| 1013 | /* Load at for the PC-relative case. */ |
| 1014 | if (nios2_as_options.relax == relax_section) |
| 1015 | { |
| 1016 | /* Insert the nextpc instruction. */ |
| 1017 | if (is_r2) |
| 1018 | op = MATCH_R2_NEXTPC | SET_IW_F3X6L5_C (AT_REGNUM); |
| 1019 | else |
| 1020 | op = MATCH_R1_NEXTPC | SET_IW_R_C (AT_REGNUM); |
| 1021 | md_number_to_chars (buffer, op, 4); |
| 1022 | fragp->fr_fix += 4; |
| 1023 | buffer += 4; |
| 1024 | |
| 1025 | /* We need to know whether the offset is positive or negative. */ |
| 1026 | target += S_GET_VALUE (symbolp); |
| 1027 | offset = target - fragp->fr_address - fragp->fr_fix; |
| 1028 | if (offset > 0) |
| 1029 | addend = 32767; |
| 1030 | else |
| 1031 | addend = -32768; |
| 1032 | if (is_r2) |
| 1033 | addend_mask = SET_IW_F2I16_IMM16 ((unsigned int)addend); |
| 1034 | else |
| 1035 | addend_mask = SET_IW_I_IMM16 ((unsigned int)addend); |
| 1036 | |
| 1037 | /* Insert n-1 addi instructions. */ |
| 1038 | if (is_r2) |
| 1039 | addi_mask = (MATCH_R2_ADDI |
| 1040 | | SET_IW_F2I16_B (AT_REGNUM) |
| 1041 | | SET_IW_F2I16_A (AT_REGNUM)); |
| 1042 | else |
| 1043 | addi_mask = (MATCH_R1_ADDI |
| 1044 | | SET_IW_I_B (AT_REGNUM) |
| 1045 | | SET_IW_I_A (AT_REGNUM)); |
| 1046 | for (i = 0; i < n - 1; i ++) |
| 1047 | { |
| 1048 | md_number_to_chars (buffer, addi_mask | addend_mask, 4); |
| 1049 | fragp->fr_fix += 4; |
| 1050 | buffer += 4; |
| 1051 | } |
| 1052 | |
| 1053 | /* Insert the last addi instruction to hold the remainder. */ |
| 1054 | remainder = offset - addend * (n - 1); |
| 1055 | gas_assert (remainder >= -32768 && remainder <= 32767); |
| 1056 | if (is_r2) |
| 1057 | addend_mask = SET_IW_F2I16_IMM16 ((unsigned int)remainder); |
| 1058 | else |
| 1059 | addend_mask = SET_IW_I_IMM16 ((unsigned int)remainder); |
| 1060 | md_number_to_chars (buffer, addi_mask | addend_mask, 4); |
| 1061 | fragp->fr_fix += 4; |
| 1062 | buffer += 4; |
| 1063 | } |
| 1064 | |
| 1065 | /* Load at for the absolute case. */ |
| 1066 | else |
| 1067 | { |
| 1068 | if (is_r2) |
| 1069 | op = MATCH_R2_ORHI | SET_IW_F2I16_B (AT_REGNUM) | SET_IW_F2I16_A (0); |
| 1070 | else |
| 1071 | op = MATCH_R1_ORHI | SET_IW_I_B (AT_REGNUM) | SET_IW_I_A (0); |
| 1072 | md_number_to_chars (buffer, op, 4); |
| 1073 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset, |
| 1074 | 0, BFD_RELOC_NIOS2_HI16); |
| 1075 | fragp->fr_fix += 4; |
| 1076 | buffer += 4; |
| 1077 | if (is_r2) |
| 1078 | op = (MATCH_R2_ORI | SET_IW_F2I16_B (AT_REGNUM) |
| 1079 | | SET_IW_F2I16_A (AT_REGNUM)); |
| 1080 | else |
| 1081 | op = (MATCH_R1_ORI | SET_IW_I_B (AT_REGNUM) |
| 1082 | | SET_IW_I_A (AT_REGNUM)); |
| 1083 | md_number_to_chars (buffer, op, 4); |
| 1084 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset, |
| 1085 | 0, BFD_RELOC_NIOS2_LO16); |
| 1086 | fragp->fr_fix += 4; |
| 1087 | buffer += 4; |
| 1088 | } |
| 1089 | |
| 1090 | /* Insert the jmp instruction. */ |
| 1091 | if (is_r2) |
| 1092 | op = MATCH_R2_JMP | SET_IW_F3X6L5_A (AT_REGNUM); |
| 1093 | else |
| 1094 | op = MATCH_R1_JMP | SET_IW_R_A (AT_REGNUM); |
| 1095 | md_number_to_chars (buffer, op, 4); |
| 1096 | fragp->fr_fix += 4; |
| 1097 | buffer += 4; |
| 1098 | } |
| 1099 | |
| 1100 | \f |
| 1101 | /** Fixups and overflow checking. */ |
| 1102 | |
| 1103 | /* Check a fixup for overflow. */ |
| 1104 | static bfd_boolean |
| 1105 | nios2_check_overflow (valueT fixup, reloc_howto_type *howto) |
| 1106 | { |
| 1107 | /* If there is a rightshift, check that the low-order bits are |
| 1108 | zero before applying it. */ |
| 1109 | if (howto->rightshift) |
| 1110 | { |
| 1111 | if ((~(~((valueT) 0) << howto->rightshift) & fixup) |
| 1112 | && howto->complain_on_overflow != complain_overflow_dont) |
| 1113 | return TRUE; |
| 1114 | fixup = ((signed)fixup) >> howto->rightshift; |
| 1115 | } |
| 1116 | |
| 1117 | /* Check for overflow - return TRUE if overflow, FALSE if not. */ |
| 1118 | switch (howto->complain_on_overflow) |
| 1119 | { |
| 1120 | case complain_overflow_dont: |
| 1121 | break; |
| 1122 | case complain_overflow_bitfield: |
| 1123 | if ((fixup >> howto->bitsize) != 0 |
| 1124 | && ((signed) fixup >> howto->bitsize) != -1) |
| 1125 | return TRUE; |
| 1126 | break; |
| 1127 | case complain_overflow_signed: |
| 1128 | if ((fixup & 0x80000000) > 0) |
| 1129 | { |
| 1130 | /* Check for negative overflow. */ |
| 1131 | if ((signed) fixup < ((signed) ~0 << (howto->bitsize-1))) |
| 1132 | return TRUE; |
| 1133 | } |
| 1134 | else |
| 1135 | { |
| 1136 | /* Check for positive overflow. */ |
| 1137 | if (fixup >= ((unsigned) 1 << (howto->bitsize - 1))) |
| 1138 | return TRUE; |
| 1139 | } |
| 1140 | break; |
| 1141 | case complain_overflow_unsigned: |
| 1142 | if ((fixup >> howto->bitsize) != 0) |
| 1143 | return TRUE; |
| 1144 | break; |
| 1145 | default: |
| 1146 | as_bad (_("error checking for overflow - broken assembler")); |
| 1147 | break; |
| 1148 | } |
| 1149 | return FALSE; |
| 1150 | } |
| 1151 | |
| 1152 | /* Emit diagnostic for fixup overflow. */ |
| 1153 | static void |
| 1154 | nios2_diagnose_overflow (valueT fixup, reloc_howto_type *howto, |
| 1155 | fixS *fixP, valueT value) |
| 1156 | { |
| 1157 | if (fixP->fx_r_type == BFD_RELOC_8 |
| 1158 | || fixP->fx_r_type == BFD_RELOC_16 |
| 1159 | || fixP->fx_r_type == BFD_RELOC_32) |
| 1160 | /* These relocs are against data, not instructions. */ |
| 1161 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1162 | _("immediate value 0x%x truncated to 0x%x"), |
| 1163 | (unsigned int) fixup, |
| 1164 | (unsigned int) (~(~(valueT) 0 << howto->bitsize) & fixup)); |
| 1165 | else |
| 1166 | { |
| 1167 | /* What opcode is the instruction? This will determine |
| 1168 | whether we check for overflow in immediate values |
| 1169 | and what error message we get. */ |
| 1170 | const struct nios2_opcode *opcode; |
| 1171 | enum overflow_type overflow_msg_type; |
| 1172 | unsigned int range_min; |
| 1173 | unsigned int range_max; |
| 1174 | unsigned int address; |
| 1175 | |
| 1176 | opcode = nios2_find_opcode_hash (value, bfd_get_mach (stdoutput)); |
| 1177 | gas_assert (opcode); |
| 1178 | gas_assert (fixP->fx_size == opcode->size); |
| 1179 | overflow_msg_type = opcode->overflow_msg; |
| 1180 | switch (overflow_msg_type) |
| 1181 | { |
| 1182 | case call_target_overflow: |
| 1183 | range_min |
| 1184 | = ((fixP->fx_frag->fr_address + fixP->fx_where) & 0xf0000000); |
| 1185 | range_max = range_min + 0x0fffffff; |
| 1186 | address = fixup | range_min; |
| 1187 | |
| 1188 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1189 | _("call target address 0x%08x out of range 0x%08x to 0x%08x"), |
| 1190 | address, range_min, range_max); |
| 1191 | break; |
| 1192 | case branch_target_overflow: |
| 1193 | if (opcode->format == iw_i_type || opcode->format == iw_F2I16_type) |
| 1194 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1195 | _("branch offset %d out of range %d to %d"), |
| 1196 | (int)fixup, -32768, 32767); |
| 1197 | else |
| 1198 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1199 | _("branch offset %d out of range"), |
| 1200 | (int)fixup); |
| 1201 | break; |
| 1202 | case address_offset_overflow: |
| 1203 | if (opcode->format == iw_i_type || opcode->format == iw_F2I16_type) |
| 1204 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1205 | _("%s offset %d out of range %d to %d"), |
| 1206 | opcode->name, (int)fixup, -32768, 32767); |
| 1207 | else |
| 1208 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1209 | _("%s offset %d out of range"), |
| 1210 | opcode->name, (int)fixup); |
| 1211 | break; |
| 1212 | case signed_immed16_overflow: |
| 1213 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1214 | _("immediate value %d out of range %d to %d"), |
| 1215 | (int)fixup, -32768, 32767); |
| 1216 | break; |
| 1217 | case unsigned_immed16_overflow: |
| 1218 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1219 | _("immediate value %u out of range %u to %u"), |
| 1220 | (unsigned int)fixup, 0, 65535); |
| 1221 | break; |
| 1222 | case unsigned_immed5_overflow: |
| 1223 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1224 | _("immediate value %u out of range %u to %u"), |
| 1225 | (unsigned int)fixup, 0, 31); |
| 1226 | break; |
| 1227 | case signed_immed12_overflow: |
| 1228 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1229 | _("immediate value %d out of range %d to %d"), |
| 1230 | (int)fixup, -2048, 2047); |
| 1231 | break; |
| 1232 | case custom_opcode_overflow: |
| 1233 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1234 | _("custom instruction opcode %u out of range %u to %u"), |
| 1235 | (unsigned int)fixup, 0, 255); |
| 1236 | break; |
| 1237 | default: |
| 1238 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1239 | _("overflow in immediate argument")); |
| 1240 | break; |
| 1241 | } |
| 1242 | } |
| 1243 | } |
| 1244 | |
| 1245 | /* Apply a fixup to the object file. */ |
| 1246 | void |
| 1247 | md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) |
| 1248 | { |
| 1249 | /* Assert that the fixup is one we can handle. */ |
| 1250 | gas_assert (fixP != NULL && valP != NULL |
| 1251 | && (fixP->fx_r_type == BFD_RELOC_8 |
| 1252 | || fixP->fx_r_type == BFD_RELOC_16 |
| 1253 | || fixP->fx_r_type == BFD_RELOC_32 |
| 1254 | || fixP->fx_r_type == BFD_RELOC_64 |
| 1255 | || fixP->fx_r_type == BFD_RELOC_NIOS2_S16 |
| 1256 | || fixP->fx_r_type == BFD_RELOC_NIOS2_U16 |
| 1257 | || fixP->fx_r_type == BFD_RELOC_16_PCREL |
| 1258 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL26 |
| 1259 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM5 |
| 1260 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CACHE_OPX |
| 1261 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM6 |
| 1262 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM8 |
| 1263 | || fixP->fx_r_type == BFD_RELOC_NIOS2_HI16 |
| 1264 | || fixP->fx_r_type == BFD_RELOC_NIOS2_LO16 |
| 1265 | || fixP->fx_r_type == BFD_RELOC_NIOS2_HIADJ16 |
| 1266 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GPREL |
| 1267 | || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT |
| 1268 | || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY |
| 1269 | || fixP->fx_r_type == BFD_RELOC_NIOS2_UJMP |
| 1270 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CJMP |
| 1271 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALLR |
| 1272 | || fixP->fx_r_type == BFD_RELOC_NIOS2_ALIGN |
| 1273 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOT16 |
| 1274 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL16 |
| 1275 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_LO |
| 1276 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_HA |
| 1277 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_GD16 |
| 1278 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LDM16 |
| 1279 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LDO16 |
| 1280 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_IE16 |
| 1281 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LE16 |
| 1282 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF |
| 1283 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPREL |
| 1284 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL26_NOAT |
| 1285 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOT_LO |
| 1286 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOT_HA |
| 1287 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL_LO |
| 1288 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL_HA |
| 1289 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_S12 |
| 1290 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_I10_1_PCREL |
| 1291 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1I7_1_PCREL |
| 1292 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1I7_2 |
| 1293 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T2I4 |
| 1294 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T2I4_1 |
| 1295 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T2I4_2 |
| 1296 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_X1I7_2 |
| 1297 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_X2L5 |
| 1298 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_F1I5_2 |
| 1299 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_L5I4X1 |
| 1300 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1X1I6 |
| 1301 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1X1I6_2 |
| 1302 | /* Add other relocs here as we generate them. */ |
| 1303 | )); |
| 1304 | |
| 1305 | if (fixP->fx_r_type == BFD_RELOC_64) |
| 1306 | { |
| 1307 | /* We may reach here due to .8byte directives, but we never output |
| 1308 | BFD_RELOC_64; it must be resolved. */ |
| 1309 | if (fixP->fx_addsy != NULL) |
| 1310 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1311 | _("cannot create 64-bit relocation")); |
| 1312 | else |
| 1313 | { |
| 1314 | md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, |
| 1315 | *valP, 8); |
| 1316 | fixP->fx_done = 1; |
| 1317 | } |
| 1318 | return; |
| 1319 | } |
| 1320 | |
| 1321 | /* The value passed in valP can be the value of a fully |
| 1322 | resolved expression, or it can be the value of a partially |
| 1323 | resolved expression. In the former case, both fixP->fx_addsy |
| 1324 | and fixP->fx_subsy are NULL, and fixP->fx_offset == *valP, and |
| 1325 | we can fix up the instruction that fixP relates to. |
| 1326 | In the latter case, one or both of fixP->fx_addsy and |
| 1327 | fixP->fx_subsy are not NULL, and fixP->fx_offset may or may not |
| 1328 | equal *valP. We don't need to check for fixP->fx_subsy being null |
| 1329 | because the generic part of the assembler generates an error if |
| 1330 | it is not an absolute symbol. */ |
| 1331 | if (fixP->fx_addsy != NULL) |
| 1332 | /* Partially resolved expression. */ |
| 1333 | { |
| 1334 | fixP->fx_addnumber = fixP->fx_offset; |
| 1335 | fixP->fx_done = 0; |
| 1336 | |
| 1337 | switch (fixP->fx_r_type) |
| 1338 | { |
| 1339 | case BFD_RELOC_NIOS2_TLS_GD16: |
| 1340 | case BFD_RELOC_NIOS2_TLS_LDM16: |
| 1341 | case BFD_RELOC_NIOS2_TLS_LDO16: |
| 1342 | case BFD_RELOC_NIOS2_TLS_IE16: |
| 1343 | case BFD_RELOC_NIOS2_TLS_LE16: |
| 1344 | case BFD_RELOC_NIOS2_TLS_DTPMOD: |
| 1345 | case BFD_RELOC_NIOS2_TLS_DTPREL: |
| 1346 | case BFD_RELOC_NIOS2_TLS_TPREL: |
| 1347 | S_SET_THREAD_LOCAL (fixP->fx_addsy); |
| 1348 | break; |
| 1349 | default: |
| 1350 | break; |
| 1351 | } |
| 1352 | } |
| 1353 | else |
| 1354 | /* Fully resolved fixup. */ |
| 1355 | { |
| 1356 | reloc_howto_type *howto |
| 1357 | = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); |
| 1358 | |
| 1359 | if (howto == NULL) |
| 1360 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1361 | _("relocation is not supported")); |
| 1362 | else |
| 1363 | { |
| 1364 | valueT fixup = *valP; |
| 1365 | valueT value; |
| 1366 | char *buf; |
| 1367 | |
| 1368 | /* If this is a pc-relative relocation, we need to |
| 1369 | subtract the current offset within the object file |
| 1370 | FIXME : for some reason fixP->fx_pcrel isn't 1 when it should be |
| 1371 | so I'm using the howto structure instead to determine this. */ |
| 1372 | if (howto->pc_relative == 1) |
| 1373 | { |
| 1374 | fixup = (fixup - (fixP->fx_frag->fr_address + fixP->fx_where |
| 1375 | + fixP->fx_size)); |
| 1376 | *valP = fixup; |
| 1377 | } |
| 1378 | |
| 1379 | /* Get the instruction or data to be fixed up. */ |
| 1380 | buf = fixP->fx_frag->fr_literal + fixP->fx_where; |
| 1381 | value = md_chars_to_number (buf, fixP->fx_size); |
| 1382 | |
| 1383 | /* Check for overflow, emitting a diagnostic if necessary. */ |
| 1384 | if (nios2_check_overflow (fixup, howto)) |
| 1385 | nios2_diagnose_overflow (fixup, howto, fixP, value); |
| 1386 | |
| 1387 | /* Apply the right shift. */ |
| 1388 | fixup = ((signed)fixup) >> howto->rightshift; |
| 1389 | |
| 1390 | /* Truncate the fixup to right size. */ |
| 1391 | switch (fixP->fx_r_type) |
| 1392 | { |
| 1393 | case BFD_RELOC_NIOS2_HI16: |
| 1394 | fixup = (fixup >> 16) & 0xFFFF; |
| 1395 | break; |
| 1396 | case BFD_RELOC_NIOS2_LO16: |
| 1397 | fixup = fixup & 0xFFFF; |
| 1398 | break; |
| 1399 | case BFD_RELOC_NIOS2_HIADJ16: |
| 1400 | fixup = ((((fixup >> 16) & 0xFFFF) + ((fixup >> 15) & 0x01)) |
| 1401 | & 0xFFFF); |
| 1402 | break; |
| 1403 | default: |
| 1404 | { |
| 1405 | int n = sizeof (fixup) * 8 - howto->bitsize; |
| 1406 | fixup = (fixup << n) >> n; |
| 1407 | break; |
| 1408 | } |
| 1409 | } |
| 1410 | |
| 1411 | /* Fix up the instruction. */ |
| 1412 | value = (value & ~howto->dst_mask) | (fixup << howto->bitpos); |
| 1413 | md_number_to_chars (buf, value, fixP->fx_size); |
| 1414 | } |
| 1415 | |
| 1416 | fixP->fx_done = 1; |
| 1417 | } |
| 1418 | |
| 1419 | if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT) |
| 1420 | { |
| 1421 | fixP->fx_done = 0; |
| 1422 | if (fixP->fx_addsy |
| 1423 | && !S_IS_DEFINED (fixP->fx_addsy) && !S_IS_WEAK (fixP->fx_addsy)) |
| 1424 | S_SET_WEAK (fixP->fx_addsy); |
| 1425 | } |
| 1426 | else if (fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) |
| 1427 | fixP->fx_done = 0; |
| 1428 | } |
| 1429 | |
| 1430 | |
| 1431 | \f |
| 1432 | /** Instruction parsing support. */ |
| 1433 | |
| 1434 | /* General internal error routine. */ |
| 1435 | |
| 1436 | static void |
| 1437 | bad_opcode (const struct nios2_opcode *op) |
| 1438 | { |
| 1439 | fprintf (stderr, _("internal error: broken opcode descriptor for `%s %s'\n"), |
| 1440 | op->name, op->args); |
| 1441 | as_fatal (_("Broken assembler. No assembly attempted.")); |
| 1442 | } |
| 1443 | |
| 1444 | /* Special relocation directive strings. */ |
| 1445 | |
| 1446 | struct nios2_special_relocS |
| 1447 | { |
| 1448 | const char *string; |
| 1449 | bfd_reloc_code_real_type reloc_type; |
| 1450 | }; |
| 1451 | |
| 1452 | /* This table is sorted so that prefix strings are listed after the longer |
| 1453 | strings that include them -- e.g., %got after %got_hiadj, etc. */ |
| 1454 | |
| 1455 | struct nios2_special_relocS nios2_special_reloc[] = { |
| 1456 | {"%hiadj", BFD_RELOC_NIOS2_HIADJ16}, |
| 1457 | {"%hi", BFD_RELOC_NIOS2_HI16}, |
| 1458 | {"%lo", BFD_RELOC_NIOS2_LO16}, |
| 1459 | {"%gprel", BFD_RELOC_NIOS2_GPREL}, |
| 1460 | {"%call_lo", BFD_RELOC_NIOS2_CALL_LO}, |
| 1461 | {"%call_hiadj", BFD_RELOC_NIOS2_CALL_HA}, |
| 1462 | {"%call", BFD_RELOC_NIOS2_CALL16}, |
| 1463 | {"%gotoff_lo", BFD_RELOC_NIOS2_GOTOFF_LO}, |
| 1464 | {"%gotoff_hiadj", BFD_RELOC_NIOS2_GOTOFF_HA}, |
| 1465 | {"%gotoff", BFD_RELOC_NIOS2_GOTOFF}, |
| 1466 | {"%got_hiadj", BFD_RELOC_NIOS2_GOT_HA}, |
| 1467 | {"%got_lo", BFD_RELOC_NIOS2_GOT_LO}, |
| 1468 | {"%got", BFD_RELOC_NIOS2_GOT16}, |
| 1469 | {"%tls_gd", BFD_RELOC_NIOS2_TLS_GD16}, |
| 1470 | {"%tls_ldm", BFD_RELOC_NIOS2_TLS_LDM16}, |
| 1471 | {"%tls_ldo", BFD_RELOC_NIOS2_TLS_LDO16}, |
| 1472 | {"%tls_ie", BFD_RELOC_NIOS2_TLS_IE16}, |
| 1473 | {"%tls_le", BFD_RELOC_NIOS2_TLS_LE16}, |
| 1474 | }; |
| 1475 | |
| 1476 | #define NIOS2_NUM_SPECIAL_RELOCS \ |
| 1477 | (sizeof(nios2_special_reloc)/sizeof(nios2_special_reloc[0])) |
| 1478 | const int nios2_num_special_relocs = NIOS2_NUM_SPECIAL_RELOCS; |
| 1479 | |
| 1480 | /* Creates a new nios2_insn_relocS and returns a pointer to it. */ |
| 1481 | static nios2_insn_relocS * |
| 1482 | nios2_insn_reloc_new (bfd_reloc_code_real_type reloc_type, unsigned int pcrel) |
| 1483 | { |
| 1484 | nios2_insn_relocS *retval; |
| 1485 | retval = (nios2_insn_relocS *) malloc (sizeof (nios2_insn_relocS)); |
| 1486 | if (retval == NULL) |
| 1487 | { |
| 1488 | as_bad (_("can't create relocation")); |
| 1489 | abort (); |
| 1490 | } |
| 1491 | |
| 1492 | /* Fill out the fields with default values. */ |
| 1493 | retval->reloc_next = NULL; |
| 1494 | retval->reloc_type = reloc_type; |
| 1495 | retval->reloc_pcrel = pcrel; |
| 1496 | return retval; |
| 1497 | } |
| 1498 | |
| 1499 | /* Frees up memory previously allocated by nios2_insn_reloc_new(). */ |
| 1500 | /* FIXME: this is never called; memory leak? */ |
| 1501 | #if 0 |
| 1502 | static void |
| 1503 | nios2_insn_reloc_destroy (nios2_insn_relocS *reloc) |
| 1504 | { |
| 1505 | gas_assert (reloc != NULL); |
| 1506 | free (reloc); |
| 1507 | } |
| 1508 | #endif |
| 1509 | |
| 1510 | /* Look up a register name and validate it for the given regtype. |
| 1511 | Return the register mapping or NULL on failure. */ |
| 1512 | static struct nios2_reg * |
| 1513 | nios2_parse_reg (const char *token, unsigned long regtype) |
| 1514 | { |
| 1515 | struct nios2_reg *reg = nios2_reg_lookup (token); |
| 1516 | |
| 1517 | if (reg == NULL) |
| 1518 | { |
| 1519 | as_bad (_("unknown register %s"), token); |
| 1520 | return NULL; |
| 1521 | } |
| 1522 | |
| 1523 | /* Matched a register, but is it the wrong type? */ |
| 1524 | if (!(regtype & reg->regtype)) |
| 1525 | { |
| 1526 | if (regtype & REG_CONTROL) |
| 1527 | as_bad (_("expecting control register")); |
| 1528 | else if (reg->regtype & REG_CONTROL) |
| 1529 | as_bad (_("illegal use of control register")); |
| 1530 | else if (reg->regtype & REG_COPROCESSOR) |
| 1531 | as_bad (_("illegal use of coprocessor register")); |
| 1532 | else |
| 1533 | as_bad (_("invalid register %s"), token); |
| 1534 | return NULL; |
| 1535 | } |
| 1536 | |
| 1537 | /* Warn for explicit use of special registers. */ |
| 1538 | if (reg->regtype & REG_NORMAL) |
| 1539 | { |
| 1540 | if (!nios2_as_options.noat && reg->index == 1) |
| 1541 | as_warn (_("Register at (r1) can sometimes be corrupted by " |
| 1542 | "assembler optimizations.\n" |
| 1543 | "Use .set noat to turn off those optimizations " |
| 1544 | "(and this warning).")); |
| 1545 | if (!nios2_as_options.nobreak && reg->index == 25) |
| 1546 | as_warn (_("The debugger will corrupt bt (r25).\n" |
| 1547 | "If you don't need to debug this " |
| 1548 | "code use .set nobreak to turn off this warning.")); |
| 1549 | if (!nios2_as_options.nobreak && reg->index == 30) |
| 1550 | as_warn (_("The debugger will corrupt sstatus/ba (r30).\n" |
| 1551 | "If you don't need to debug this " |
| 1552 | "code use .set nobreak to turn off this warning.")); |
| 1553 | } |
| 1554 | |
| 1555 | return reg; |
| 1556 | } |
| 1557 | |
| 1558 | /* This function parses a reglist for ldwm/stwm and push.n/pop.n |
| 1559 | instructions, given as a brace-enclosed register list. The tokenizer |
| 1560 | has replaced commas in the token with spaces. |
| 1561 | The return value is a bitmask of registers in the set. It also |
| 1562 | sets nios2_reglist_mask and nios2_reglist_dir to allow error checking |
| 1563 | when parsing the base register. */ |
| 1564 | |
| 1565 | static unsigned long nios2_reglist_mask; |
| 1566 | static int nios2_reglist_dir; |
| 1567 | |
| 1568 | static unsigned long |
| 1569 | nios2_parse_reglist (char *token, const struct nios2_opcode *op) |
| 1570 | { |
| 1571 | unsigned long mask = 0; |
| 1572 | int dir = 0; |
| 1573 | unsigned long regtype = 0; |
| 1574 | int last = -1; |
| 1575 | const char *regname; |
| 1576 | |
| 1577 | nios2_reglist_mask = 0; |
| 1578 | nios2_reglist_dir = 0; |
| 1579 | |
| 1580 | if (op->match == MATCH_R2_LDWM || op->match == MATCH_R2_STWM) |
| 1581 | { |
| 1582 | regtype = REG_LDWM; |
| 1583 | dir = 0; |
| 1584 | } |
| 1585 | else if (op->match == MATCH_R2_PUSH_N) |
| 1586 | { |
| 1587 | regtype = REG_POP; |
| 1588 | dir = -1; |
| 1589 | } |
| 1590 | else if (op->match == MATCH_R2_POP_N) |
| 1591 | { |
| 1592 | regtype = REG_POP; |
| 1593 | dir = 1; |
| 1594 | } |
| 1595 | else |
| 1596 | bad_opcode (op); |
| 1597 | |
| 1598 | for (regname = strtok (token, "{ }"); |
| 1599 | regname; |
| 1600 | regname = strtok (NULL, "{ }")) |
| 1601 | { |
| 1602 | int regno; |
| 1603 | struct nios2_reg *reg = nios2_parse_reg (regname, regtype); |
| 1604 | |
| 1605 | if (!reg) |
| 1606 | break; |
| 1607 | regno = reg->index; |
| 1608 | |
| 1609 | /* Make sure registers are listed in proper sequence. */ |
| 1610 | if (last >= 0) |
| 1611 | { |
| 1612 | if (regno == last) |
| 1613 | { |
| 1614 | as_bad ("duplicate register %s\n", reg->name); |
| 1615 | return 0; |
| 1616 | } |
| 1617 | else if (dir == 0) |
| 1618 | dir = (regno < last ? -1 : 1); |
| 1619 | else if ((dir > 0 && regno < last) |
| 1620 | || (dir < 0 && regno > last) |
| 1621 | || (op->match == MATCH_R2_PUSH_N |
| 1622 | && ! ((last == 31 && regno == 28) |
| 1623 | || (last == 31 && regno <= 23) |
| 1624 | || (last == 28 && regno <= 23) |
| 1625 | || (regno < 23 && regno == last - 1))) |
| 1626 | || (op->match == MATCH_R2_POP_N |
| 1627 | && ! ((regno == 31 && last == 28) |
| 1628 | || (regno == 31 && last <= 23) |
| 1629 | || (regno == 28 && last <= 23) |
| 1630 | || (last < 23 && last == regno - 1)))) |
| 1631 | { |
| 1632 | as_bad ("invalid register order"); |
| 1633 | return 0; |
| 1634 | } |
| 1635 | } |
| 1636 | |
| 1637 | mask |= 1 << regno; |
| 1638 | last = regno; |
| 1639 | } |
| 1640 | |
| 1641 | /* Check that all ldwm/stwm regs belong to the same set. */ |
| 1642 | if ((op->match == MATCH_R2_LDWM || op->match == MATCH_R2_STWM) |
| 1643 | && (mask & 0x00003ffc) && (mask & 0x90ffc000)) |
| 1644 | { |
| 1645 | as_bad ("invalid register set in reglist"); |
| 1646 | return 0; |
| 1647 | } |
| 1648 | |
| 1649 | /* Check that push.n/pop.n regs include RA. */ |
| 1650 | if ((op->match == MATCH_R2_PUSH_N || op->match == MATCH_R2_POP_N) |
| 1651 | && ((mask & 0x80000000) == 0)) |
| 1652 | { |
| 1653 | as_bad ("reglist must include ra (r31)"); |
| 1654 | return 0; |
| 1655 | } |
| 1656 | |
| 1657 | /* Check that there is at least one register in the set. */ |
| 1658 | if (!mask) |
| 1659 | { |
| 1660 | as_bad ("reglist must include at least one register"); |
| 1661 | return 0; |
| 1662 | } |
| 1663 | |
| 1664 | /* OK, reglist passed validation. */ |
| 1665 | nios2_reglist_mask = mask; |
| 1666 | nios2_reglist_dir = dir; |
| 1667 | return mask; |
| 1668 | } |
| 1669 | |
| 1670 | /* This function parses the base register and options used by the ldwm/stwm |
| 1671 | instructions. Returns the base register and sets the option arguments |
| 1672 | accordingly. On failure, returns NULL. */ |
| 1673 | static struct nios2_reg * |
| 1674 | nios2_parse_base_register (char *str, int *direction, int *writeback, int *ret) |
| 1675 | { |
| 1676 | char *regname; |
| 1677 | struct nios2_reg *reg; |
| 1678 | |
| 1679 | *direction = 0; |
| 1680 | *writeback = 0; |
| 1681 | *ret = 0; |
| 1682 | |
| 1683 | /* Check for --. */ |
| 1684 | if (strncmp (str, "--", 2) == 0) |
| 1685 | { |
| 1686 | str += 2; |
| 1687 | *direction -= 1; |
| 1688 | } |
| 1689 | |
| 1690 | /* Extract the base register. */ |
| 1691 | if (*str != '(') |
| 1692 | { |
| 1693 | as_bad ("expected '(' before base register"); |
| 1694 | return NULL; |
| 1695 | } |
| 1696 | str++; |
| 1697 | regname = str; |
| 1698 | str = strchr (str, ')'); |
| 1699 | if (!str) |
| 1700 | { |
| 1701 | as_bad ("expected ')' after base register"); |
| 1702 | return NULL; |
| 1703 | } |
| 1704 | *str = '\0'; |
| 1705 | str++; |
| 1706 | reg = nios2_parse_reg (regname, REG_NORMAL); |
| 1707 | if (reg == NULL) |
| 1708 | return NULL; |
| 1709 | |
| 1710 | /* Check for ++. */ |
| 1711 | if (strncmp (str, "++", 2) == 0) |
| 1712 | { |
| 1713 | str += 2; |
| 1714 | *direction += 1; |
| 1715 | } |
| 1716 | |
| 1717 | /* Ensure that either -- or ++ is specified, but not both. */ |
| 1718 | if (*direction == 0) |
| 1719 | { |
| 1720 | as_bad ("invalid base register syntax"); |
| 1721 | return NULL;; |
| 1722 | } |
| 1723 | |
| 1724 | /* Check for options. The tokenizer has replaced commas with spaces. */ |
| 1725 | while (*str) |
| 1726 | { |
| 1727 | while (*str == ' ') |
| 1728 | str++; |
| 1729 | if (strncmp (str, "writeback", 9) == 0) |
| 1730 | { |
| 1731 | *writeback = 1; |
| 1732 | str += 9; |
| 1733 | } |
| 1734 | else if (strncmp (str, "ret", 3) == 0) |
| 1735 | { |
| 1736 | *ret = 1; |
| 1737 | str += 3; |
| 1738 | } |
| 1739 | else if (*str) |
| 1740 | { |
| 1741 | as_bad ("invalid option syntax"); |
| 1742 | return NULL; |
| 1743 | } |
| 1744 | } |
| 1745 | |
| 1746 | return reg; |
| 1747 | } |
| 1748 | |
| 1749 | |
| 1750 | /* The various nios2_assemble_* functions call this |
| 1751 | function to generate an expression from a string representing an expression. |
| 1752 | It then tries to evaluate the expression, and if it can, returns its value. |
| 1753 | If not, it creates a new nios2_insn_relocS and stores the expression and |
| 1754 | reloc_type for future use. */ |
| 1755 | static unsigned long |
| 1756 | nios2_assemble_expression (const char *exprstr, |
| 1757 | nios2_insn_infoS *insn, |
| 1758 | bfd_reloc_code_real_type orig_reloc_type, |
| 1759 | unsigned int pcrel) |
| 1760 | { |
| 1761 | nios2_insn_relocS *reloc; |
| 1762 | char *saved_line_ptr; |
| 1763 | unsigned long value = 0; |
| 1764 | int i; |
| 1765 | bfd_reloc_code_real_type reloc_type = orig_reloc_type; |
| 1766 | |
| 1767 | gas_assert (exprstr != NULL); |
| 1768 | gas_assert (insn != NULL); |
| 1769 | |
| 1770 | /* Check for relocation operators. |
| 1771 | Change the relocation type and advance the ptr to the start of |
| 1772 | the expression proper. */ |
| 1773 | for (i = 0; i < nios2_num_special_relocs; i++) |
| 1774 | if (strstr (exprstr, nios2_special_reloc[i].string) != NULL) |
| 1775 | { |
| 1776 | reloc_type = nios2_special_reloc[i].reloc_type; |
| 1777 | exprstr += strlen (nios2_special_reloc[i].string) + 1; |
| 1778 | |
| 1779 | /* %lo and %hiadj have different meanings for PC-relative |
| 1780 | expressions. */ |
| 1781 | if (pcrel) |
| 1782 | { |
| 1783 | if (reloc_type == BFD_RELOC_NIOS2_LO16) |
| 1784 | reloc_type = BFD_RELOC_NIOS2_PCREL_LO; |
| 1785 | if (reloc_type == BFD_RELOC_NIOS2_HIADJ16) |
| 1786 | reloc_type = BFD_RELOC_NIOS2_PCREL_HA; |
| 1787 | } |
| 1788 | |
| 1789 | break; |
| 1790 | } |
| 1791 | |
| 1792 | /* No relocation allowed; we must have a constant expression. */ |
| 1793 | if (orig_reloc_type == BFD_RELOC_NONE) |
| 1794 | { |
| 1795 | expressionS exp; |
| 1796 | |
| 1797 | /* Parse the expression string. */ |
| 1798 | saved_line_ptr = input_line_pointer; |
| 1799 | input_line_pointer = (char *) exprstr; |
| 1800 | expression (&exp); |
| 1801 | input_line_pointer = saved_line_ptr; |
| 1802 | |
| 1803 | /* If we don't have a constant, give an error. */ |
| 1804 | if (reloc_type != orig_reloc_type || exp.X_op != O_constant) |
| 1805 | as_bad (_("expression must be constant")); |
| 1806 | else |
| 1807 | value = exp.X_add_number; |
| 1808 | return (unsigned long) value; |
| 1809 | } |
| 1810 | |
| 1811 | /* We potentially have a relocation. */ |
| 1812 | reloc = nios2_insn_reloc_new (reloc_type, pcrel); |
| 1813 | reloc->reloc_next = insn->insn_reloc; |
| 1814 | insn->insn_reloc = reloc; |
| 1815 | |
| 1816 | /* Parse the expression string. */ |
| 1817 | saved_line_ptr = input_line_pointer; |
| 1818 | input_line_pointer = (char *) exprstr; |
| 1819 | expression (&reloc->reloc_expression); |
| 1820 | input_line_pointer = saved_line_ptr; |
| 1821 | |
| 1822 | /* This is redundant as the fixup will put this into |
| 1823 | the instruction, but it is included here so that |
| 1824 | self-test mode (-r) works. */ |
| 1825 | if (nios2_mode == NIOS2_MODE_TEST |
| 1826 | && reloc->reloc_expression.X_op == O_constant) |
| 1827 | value = reloc->reloc_expression.X_add_number; |
| 1828 | |
| 1829 | return (unsigned long) value; |
| 1830 | } |
| 1831 | |
| 1832 | /* Encode a 3-bit register number, giving an error if this is not possible. */ |
| 1833 | static unsigned int |
| 1834 | nios2_assemble_reg3 (const char *token) |
| 1835 | { |
| 1836 | struct nios2_reg *reg = nios2_parse_reg (token, REG_3BIT); |
| 1837 | int j; |
| 1838 | |
| 1839 | if (reg == NULL) |
| 1840 | return 0; |
| 1841 | |
| 1842 | for (j = 0; j < nios2_num_r2_reg3_mappings; j++) |
| 1843 | if (nios2_r2_reg3_mappings[j] == reg->index) |
| 1844 | return j; |
| 1845 | |
| 1846 | /* Should never get here if we passed validation. */ |
| 1847 | as_bad (_("invalid register %s"), token); |
| 1848 | return 0; |
| 1849 | } |
| 1850 | |
| 1851 | /* Argument assemble functions. */ |
| 1852 | |
| 1853 | |
| 1854 | /* Control register index. */ |
| 1855 | static void |
| 1856 | nios2_assemble_arg_c (const char *token, nios2_insn_infoS *insn) |
| 1857 | { |
| 1858 | struct nios2_reg *reg = nios2_parse_reg (token, REG_CONTROL); |
| 1859 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 1860 | |
| 1861 | if (reg == NULL) |
| 1862 | return; |
| 1863 | |
| 1864 | switch (op->format) |
| 1865 | { |
| 1866 | case iw_r_type: |
| 1867 | insn->insn_code |= SET_IW_R_IMM5 (reg->index); |
| 1868 | break; |
| 1869 | case iw_F3X6L5_type: |
| 1870 | insn->insn_code |= SET_IW_F3X6L5_IMM5 (reg->index); |
| 1871 | break; |
| 1872 | default: |
| 1873 | bad_opcode (op); |
| 1874 | } |
| 1875 | } |
| 1876 | |
| 1877 | /* Destination register. */ |
| 1878 | static void |
| 1879 | nios2_assemble_arg_d (const char *token, nios2_insn_infoS *insn) |
| 1880 | { |
| 1881 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 1882 | unsigned long regtype = REG_NORMAL; |
| 1883 | struct nios2_reg *reg; |
| 1884 | |
| 1885 | if (op->format == iw_custom_type || op->format == iw_F3X8_type) |
| 1886 | regtype |= REG_COPROCESSOR; |
| 1887 | reg = nios2_parse_reg (token, regtype); |
| 1888 | if (reg == NULL) |
| 1889 | return; |
| 1890 | |
| 1891 | switch (op->format) |
| 1892 | { |
| 1893 | case iw_r_type: |
| 1894 | insn->insn_code |= SET_IW_R_C (reg->index); |
| 1895 | break; |
| 1896 | case iw_custom_type: |
| 1897 | insn->insn_code |= SET_IW_CUSTOM_C (reg->index); |
| 1898 | if (reg->regtype & REG_COPROCESSOR) |
| 1899 | insn->insn_code |= SET_IW_CUSTOM_READC (0); |
| 1900 | else |
| 1901 | insn->insn_code |= SET_IW_CUSTOM_READC (1); |
| 1902 | break; |
| 1903 | case iw_F3X6L5_type: |
| 1904 | case iw_F3X6_type: |
| 1905 | insn->insn_code |= SET_IW_F3X6L5_C (reg->index); |
| 1906 | break; |
| 1907 | case iw_F3X8_type: |
| 1908 | insn->insn_code |= SET_IW_F3X8_C (reg->index); |
| 1909 | if (reg->regtype & REG_COPROCESSOR) |
| 1910 | insn->insn_code |= SET_IW_F3X8_READC (0); |
| 1911 | else |
| 1912 | insn->insn_code |= SET_IW_F3X8_READC (1); |
| 1913 | break; |
| 1914 | case iw_F2_type: |
| 1915 | insn->insn_code |= SET_IW_F2_B (reg->index); |
| 1916 | break; |
| 1917 | default: |
| 1918 | bad_opcode (op); |
| 1919 | } |
| 1920 | } |
| 1921 | |
| 1922 | /* Source register 1. */ |
| 1923 | static void |
| 1924 | nios2_assemble_arg_s (const char *token, nios2_insn_infoS *insn) |
| 1925 | { |
| 1926 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 1927 | unsigned long regtype = REG_NORMAL; |
| 1928 | struct nios2_reg *reg; |
| 1929 | |
| 1930 | if (op->format == iw_custom_type || op->format == iw_F3X8_type) |
| 1931 | regtype |= REG_COPROCESSOR; |
| 1932 | reg = nios2_parse_reg (token, regtype); |
| 1933 | if (reg == NULL) |
| 1934 | return; |
| 1935 | |
| 1936 | switch (op->format) |
| 1937 | { |
| 1938 | case iw_r_type: |
| 1939 | if (op->match == MATCH_R1_JMP && reg->index == 31) |
| 1940 | as_bad (_("r31 cannot be used with jmp; use ret instead")); |
| 1941 | insn->insn_code |= SET_IW_R_A (reg->index); |
| 1942 | break; |
| 1943 | case iw_i_type: |
| 1944 | insn->insn_code |= SET_IW_I_A (reg->index); |
| 1945 | break; |
| 1946 | case iw_custom_type: |
| 1947 | insn->insn_code |= SET_IW_CUSTOM_A (reg->index); |
| 1948 | if (reg->regtype & REG_COPROCESSOR) |
| 1949 | insn->insn_code |= SET_IW_CUSTOM_READA (0); |
| 1950 | else |
| 1951 | insn->insn_code |= SET_IW_CUSTOM_READA (1); |
| 1952 | break; |
| 1953 | case iw_F2I16_type: |
| 1954 | insn->insn_code |= SET_IW_F2I16_A (reg->index); |
| 1955 | break; |
| 1956 | case iw_F2X4I12_type: |
| 1957 | insn->insn_code |= SET_IW_F2X4I12_A (reg->index); |
| 1958 | break; |
| 1959 | case iw_F1X4I12_type: |
| 1960 | insn->insn_code |= SET_IW_F1X4I12_A (reg->index); |
| 1961 | break; |
| 1962 | case iw_F1X4L17_type: |
| 1963 | insn->insn_code |= SET_IW_F1X4L17_A (reg->index); |
| 1964 | break; |
| 1965 | case iw_F3X6L5_type: |
| 1966 | case iw_F3X6_type: |
| 1967 | if (op->match == MATCH_R2_JMP && reg->index == 31) |
| 1968 | as_bad (_("r31 cannot be used with jmp; use ret instead")); |
| 1969 | insn->insn_code |= SET_IW_F3X6L5_A (reg->index); |
| 1970 | break; |
| 1971 | case iw_F2X6L10_type: |
| 1972 | insn->insn_code |= SET_IW_F2X6L10_A (reg->index); |
| 1973 | break; |
| 1974 | case iw_F3X8_type: |
| 1975 | insn->insn_code |= SET_IW_F3X8_A (reg->index); |
| 1976 | if (reg->regtype & REG_COPROCESSOR) |
| 1977 | insn->insn_code |= SET_IW_F3X8_READA (0); |
| 1978 | else |
| 1979 | insn->insn_code |= SET_IW_F3X8_READA (1); |
| 1980 | break; |
| 1981 | case iw_F1X1_type: |
| 1982 | if (op->match == MATCH_R2_JMPR_N && reg->index == 31) |
| 1983 | as_bad (_("r31 cannot be used with jmpr.n; use ret.n instead")); |
| 1984 | insn->insn_code |= SET_IW_F1X1_A (reg->index); |
| 1985 | break; |
| 1986 | case iw_F1I5_type: |
| 1987 | /* Implicit stack pointer reference. */ |
| 1988 | if (reg->index != 27) |
| 1989 | as_bad (_("invalid register %s"), token); |
| 1990 | break; |
| 1991 | case iw_F2_type: |
| 1992 | insn->insn_code |= SET_IW_F2_A (reg->index); |
| 1993 | break; |
| 1994 | default: |
| 1995 | bad_opcode (op); |
| 1996 | } |
| 1997 | } |
| 1998 | |
| 1999 | /* Source register 2. */ |
| 2000 | static void |
| 2001 | nios2_assemble_arg_t (const char *token, nios2_insn_infoS *insn) |
| 2002 | { |
| 2003 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2004 | unsigned long regtype = REG_NORMAL; |
| 2005 | struct nios2_reg *reg; |
| 2006 | |
| 2007 | if (op->format == iw_custom_type || op->format == iw_F3X8_type) |
| 2008 | regtype |= REG_COPROCESSOR; |
| 2009 | reg = nios2_parse_reg (token, regtype); |
| 2010 | if (reg == NULL) |
| 2011 | return; |
| 2012 | |
| 2013 | switch (op->format) |
| 2014 | { |
| 2015 | case iw_r_type: |
| 2016 | insn->insn_code |= SET_IW_R_B (reg->index); |
| 2017 | break; |
| 2018 | case iw_i_type: |
| 2019 | insn->insn_code |= SET_IW_I_B (reg->index); |
| 2020 | break; |
| 2021 | case iw_custom_type: |
| 2022 | insn->insn_code |= SET_IW_CUSTOM_B (reg->index); |
| 2023 | if (reg->regtype & REG_COPROCESSOR) |
| 2024 | insn->insn_code |= SET_IW_CUSTOM_READB (0); |
| 2025 | else |
| 2026 | insn->insn_code |= SET_IW_CUSTOM_READB (1); |
| 2027 | break; |
| 2028 | case iw_F2I16_type: |
| 2029 | insn->insn_code |= SET_IW_F2I16_B (reg->index); |
| 2030 | break; |
| 2031 | case iw_F2X4I12_type: |
| 2032 | insn->insn_code |= SET_IW_F2X4I12_B (reg->index); |
| 2033 | break; |
| 2034 | case iw_F3X6L5_type: |
| 2035 | case iw_F3X6_type: |
| 2036 | insn->insn_code |= SET_IW_F3X6L5_B (reg->index); |
| 2037 | break; |
| 2038 | case iw_F2X6L10_type: |
| 2039 | insn->insn_code |= SET_IW_F2X6L10_B (reg->index); |
| 2040 | break; |
| 2041 | case iw_F3X8_type: |
| 2042 | insn->insn_code |= SET_IW_F3X8_B (reg->index); |
| 2043 | if (reg->regtype & REG_COPROCESSOR) |
| 2044 | insn->insn_code |= SET_IW_F3X8_READB (0); |
| 2045 | else |
| 2046 | insn->insn_code |= SET_IW_F3X8_READB (1); |
| 2047 | break; |
| 2048 | case iw_F1I5_type: |
| 2049 | insn->insn_code |= SET_IW_F1I5_B (reg->index); |
| 2050 | break; |
| 2051 | case iw_F2_type: |
| 2052 | insn->insn_code |= SET_IW_F2_B (reg->index); |
| 2053 | break; |
| 2054 | case iw_T1X1I6_type: |
| 2055 | /* Implicit zero register reference. */ |
| 2056 | if (reg->index != 0) |
| 2057 | as_bad (_("invalid register %s"), token); |
| 2058 | break; |
| 2059 | |
| 2060 | default: |
| 2061 | bad_opcode (op); |
| 2062 | } |
| 2063 | } |
| 2064 | |
| 2065 | /* Destination register w/3-bit encoding. */ |
| 2066 | static void |
| 2067 | nios2_assemble_arg_D (const char *token, nios2_insn_infoS *insn) |
| 2068 | { |
| 2069 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2070 | int reg = nios2_assemble_reg3 (token); |
| 2071 | |
| 2072 | switch (op->format) |
| 2073 | { |
| 2074 | case iw_T1I7_type: |
| 2075 | insn->insn_code |= SET_IW_T1I7_A3 (reg); |
| 2076 | break; |
| 2077 | case iw_T2X1L3_type: |
| 2078 | insn->insn_code |= SET_IW_T2X1L3_B3 (reg); |
| 2079 | break; |
| 2080 | case iw_T2X1I3_type: |
| 2081 | insn->insn_code |= SET_IW_T2X1I3_B3 (reg); |
| 2082 | break; |
| 2083 | case iw_T3X1_type: |
| 2084 | insn->insn_code |= SET_IW_T3X1_C3 (reg); |
| 2085 | break; |
| 2086 | case iw_T2X3_type: |
| 2087 | /* Some instructions using this encoding take 3 register arguments, |
| 2088 | requiring the destination register to be the same as the first |
| 2089 | source register. */ |
| 2090 | if (op->num_args == 3) |
| 2091 | insn->insn_code |= SET_IW_T2X3_A3 (reg); |
| 2092 | else |
| 2093 | insn->insn_code |= SET_IW_T2X3_B3 (reg); |
| 2094 | break; |
| 2095 | default: |
| 2096 | bad_opcode (op); |
| 2097 | } |
| 2098 | } |
| 2099 | |
| 2100 | /* Source register w/3-bit encoding. */ |
| 2101 | static void |
| 2102 | nios2_assemble_arg_S (const char *token, nios2_insn_infoS *insn) |
| 2103 | { |
| 2104 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2105 | int reg = nios2_assemble_reg3 (token); |
| 2106 | |
| 2107 | switch (op->format) |
| 2108 | { |
| 2109 | case iw_T1I7_type: |
| 2110 | insn->insn_code |= SET_IW_T1I7_A3 (reg); |
| 2111 | break; |
| 2112 | case iw_T2I4_type: |
| 2113 | insn->insn_code |= SET_IW_T2I4_A3 (reg); |
| 2114 | break; |
| 2115 | case iw_T2X1L3_type: |
| 2116 | insn->insn_code |= SET_IW_T2X1L3_A3 (reg); |
| 2117 | break; |
| 2118 | case iw_T2X1I3_type: |
| 2119 | insn->insn_code |= SET_IW_T2X1I3_A3 (reg); |
| 2120 | break; |
| 2121 | case iw_T3X1_type: |
| 2122 | insn->insn_code |= SET_IW_T3X1_A3 (reg); |
| 2123 | break; |
| 2124 | case iw_T2X3_type: |
| 2125 | /* Some instructions using this encoding take 3 register arguments, |
| 2126 | requiring the destination register to be the same as the first |
| 2127 | source register. */ |
| 2128 | if (op->num_args == 3) |
| 2129 | { |
| 2130 | int dreg = GET_IW_T2X3_A3 (insn->insn_code); |
| 2131 | if (dreg != reg) |
| 2132 | as_bad ("source and destination registers must be the same"); |
| 2133 | } |
| 2134 | else |
| 2135 | insn->insn_code |= SET_IW_T2X3_A3 (reg); |
| 2136 | break; |
| 2137 | case iw_T1X1I6_type: |
| 2138 | insn->insn_code |= SET_IW_T1X1I6_A3 (reg); |
| 2139 | break; |
| 2140 | default: |
| 2141 | bad_opcode (op); |
| 2142 | } |
| 2143 | } |
| 2144 | |
| 2145 | /* Source register 2 w/3-bit encoding. */ |
| 2146 | static void |
| 2147 | nios2_assemble_arg_T (const char *token, nios2_insn_infoS *insn) |
| 2148 | { |
| 2149 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2150 | int reg = nios2_assemble_reg3 (token); |
| 2151 | |
| 2152 | switch (op->format) |
| 2153 | { |
| 2154 | case iw_T2I4_type: |
| 2155 | insn->insn_code |= SET_IW_T2I4_B3 (reg); |
| 2156 | break; |
| 2157 | case iw_T3X1_type: |
| 2158 | insn->insn_code |= SET_IW_T3X1_B3 (reg); |
| 2159 | break; |
| 2160 | case iw_T2X3_type: |
| 2161 | insn->insn_code |= SET_IW_T2X3_B3 (reg); |
| 2162 | break; |
| 2163 | default: |
| 2164 | bad_opcode (op); |
| 2165 | } |
| 2166 | } |
| 2167 | |
| 2168 | /* 16-bit signed immediate. */ |
| 2169 | static void |
| 2170 | nios2_assemble_arg_i (const char *token, nios2_insn_infoS *insn) |
| 2171 | { |
| 2172 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2173 | unsigned int val; |
| 2174 | |
| 2175 | switch (op->format) |
| 2176 | { |
| 2177 | case iw_i_type: |
| 2178 | val = nios2_assemble_expression (token, insn, |
| 2179 | BFD_RELOC_NIOS2_S16, 0); |
| 2180 | insn->constant_bits |= SET_IW_I_IMM16 (val); |
| 2181 | break; |
| 2182 | case iw_F2I16_type: |
| 2183 | val = nios2_assemble_expression (token, insn, |
| 2184 | BFD_RELOC_NIOS2_S16, 0); |
| 2185 | insn->constant_bits |= SET_IW_F2I16_IMM16 (val); |
| 2186 | break; |
| 2187 | default: |
| 2188 | bad_opcode (op); |
| 2189 | } |
| 2190 | } |
| 2191 | |
| 2192 | /* 12-bit signed immediate. */ |
| 2193 | static void |
| 2194 | nios2_assemble_arg_I (const char *token, nios2_insn_infoS *insn) |
| 2195 | { |
| 2196 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2197 | unsigned int val; |
| 2198 | |
| 2199 | switch (op->format) |
| 2200 | { |
| 2201 | case iw_F2X4I12_type: |
| 2202 | val = nios2_assemble_expression (token, insn, |
| 2203 | BFD_RELOC_NIOS2_R2_S12, 0); |
| 2204 | insn->constant_bits |= SET_IW_F2X4I12_IMM12 (val); |
| 2205 | break; |
| 2206 | case iw_F1X4I12_type: |
| 2207 | val = nios2_assemble_expression (token, insn, |
| 2208 | BFD_RELOC_NIOS2_R2_S12, 0); |
| 2209 | insn->constant_bits |= SET_IW_F2X4I12_IMM12 (val); |
| 2210 | break; |
| 2211 | default: |
| 2212 | bad_opcode (op); |
| 2213 | } |
| 2214 | } |
| 2215 | |
| 2216 | /* 16-bit unsigned immediate. */ |
| 2217 | static void |
| 2218 | nios2_assemble_arg_u (const char *token, nios2_insn_infoS *insn) |
| 2219 | { |
| 2220 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2221 | unsigned int val; |
| 2222 | |
| 2223 | switch (op->format) |
| 2224 | { |
| 2225 | case iw_i_type: |
| 2226 | val = nios2_assemble_expression (token, insn, |
| 2227 | BFD_RELOC_NIOS2_U16, 0); |
| 2228 | insn->constant_bits |= SET_IW_I_IMM16 (val); |
| 2229 | break; |
| 2230 | case iw_F2I16_type: |
| 2231 | val = nios2_assemble_expression (token, insn, |
| 2232 | BFD_RELOC_NIOS2_U16, 0); |
| 2233 | insn->constant_bits |= SET_IW_F2I16_IMM16 (val); |
| 2234 | break; |
| 2235 | default: |
| 2236 | bad_opcode (op); |
| 2237 | } |
| 2238 | } |
| 2239 | |
| 2240 | /* 7-bit unsigned immediate with 2-bit shift. */ |
| 2241 | static void |
| 2242 | nios2_assemble_arg_U (const char *token, nios2_insn_infoS *insn) |
| 2243 | { |
| 2244 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2245 | unsigned int val; |
| 2246 | |
| 2247 | switch (op->format) |
| 2248 | { |
| 2249 | case iw_T1I7_type: |
| 2250 | val = nios2_assemble_expression (token, insn, |
| 2251 | BFD_RELOC_NIOS2_R2_T1I7_2, 0); |
| 2252 | insn->constant_bits |= SET_IW_T1I7_IMM7 (val >> 2); |
| 2253 | break; |
| 2254 | case iw_X1I7_type: |
| 2255 | val = nios2_assemble_expression (token, insn, |
| 2256 | BFD_RELOC_NIOS2_R2_X1I7_2, 0); |
| 2257 | insn->constant_bits |= SET_IW_X1I7_IMM7 (val >> 2); |
| 2258 | break; |
| 2259 | default: |
| 2260 | bad_opcode (op); |
| 2261 | } |
| 2262 | } |
| 2263 | |
| 2264 | /* 5-bit unsigned immediate with 2-bit shift. */ |
| 2265 | static void |
| 2266 | nios2_assemble_arg_V (const char *token, nios2_insn_infoS *insn) |
| 2267 | { |
| 2268 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2269 | unsigned int val; |
| 2270 | |
| 2271 | switch (op->format) |
| 2272 | { |
| 2273 | case iw_F1I5_type: |
| 2274 | val = nios2_assemble_expression (token, insn, |
| 2275 | BFD_RELOC_NIOS2_R2_F1I5_2, 0); |
| 2276 | insn->constant_bits |= SET_IW_F1I5_IMM5 (val >> 2); |
| 2277 | break; |
| 2278 | default: |
| 2279 | bad_opcode (op); |
| 2280 | } |
| 2281 | } |
| 2282 | |
| 2283 | /* 4-bit unsigned immediate with 2-bit shift. */ |
| 2284 | static void |
| 2285 | nios2_assemble_arg_W (const char *token, nios2_insn_infoS *insn) |
| 2286 | { |
| 2287 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2288 | unsigned int val; |
| 2289 | |
| 2290 | switch (op->format) |
| 2291 | { |
| 2292 | case iw_T2I4_type: |
| 2293 | val = nios2_assemble_expression (token, insn, |
| 2294 | BFD_RELOC_NIOS2_R2_T2I4_2, 0); |
| 2295 | insn->constant_bits |= SET_IW_T2I4_IMM4 (val >> 2); |
| 2296 | break; |
| 2297 | case iw_L5I4X1_type: |
| 2298 | /* This argument is optional for push.n/pop.n, and defaults to |
| 2299 | zero if unspecified. */ |
| 2300 | if (token == NULL) |
| 2301 | return; |
| 2302 | |
| 2303 | val = nios2_assemble_expression (token, insn, |
| 2304 | BFD_RELOC_NIOS2_R2_L5I4X1, 0); |
| 2305 | insn->constant_bits |= SET_IW_L5I4X1_IMM4 (val >> 2); |
| 2306 | break; |
| 2307 | default: |
| 2308 | bad_opcode (op); |
| 2309 | } |
| 2310 | } |
| 2311 | |
| 2312 | /* 4-bit unsigned immediate with 1-bit shift. */ |
| 2313 | static void |
| 2314 | nios2_assemble_arg_X (const char *token, nios2_insn_infoS *insn) |
| 2315 | { |
| 2316 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2317 | unsigned int val; |
| 2318 | |
| 2319 | switch (op->format) |
| 2320 | { |
| 2321 | case iw_T2I4_type: |
| 2322 | val = nios2_assemble_expression (token, insn, |
| 2323 | BFD_RELOC_NIOS2_R2_T2I4_1, 0); |
| 2324 | insn->constant_bits |= SET_IW_T2I4_IMM4 (val >> 1); |
| 2325 | break; |
| 2326 | default: |
| 2327 | bad_opcode (op); |
| 2328 | } |
| 2329 | } |
| 2330 | |
| 2331 | /* 4-bit unsigned immediate without shift. */ |
| 2332 | static void |
| 2333 | nios2_assemble_arg_Y (const char *token, nios2_insn_infoS *insn) |
| 2334 | { |
| 2335 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2336 | unsigned int val; |
| 2337 | |
| 2338 | switch (op->format) |
| 2339 | { |
| 2340 | case iw_T2I4_type: |
| 2341 | val = nios2_assemble_expression (token, insn, |
| 2342 | BFD_RELOC_NIOS2_R2_T2I4, 0); |
| 2343 | insn->constant_bits |= SET_IW_T2I4_IMM4 (val); |
| 2344 | break; |
| 2345 | default: |
| 2346 | bad_opcode (op); |
| 2347 | } |
| 2348 | } |
| 2349 | |
| 2350 | |
| 2351 | /* 16-bit signed immediate address offset. */ |
| 2352 | static void |
| 2353 | nios2_assemble_arg_o (const char *token, nios2_insn_infoS *insn) |
| 2354 | { |
| 2355 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2356 | unsigned int val; |
| 2357 | |
| 2358 | switch (op->format) |
| 2359 | { |
| 2360 | case iw_i_type: |
| 2361 | val = nios2_assemble_expression (token, insn, |
| 2362 | BFD_RELOC_16_PCREL, 1); |
| 2363 | insn->constant_bits |= SET_IW_I_IMM16 (val); |
| 2364 | break; |
| 2365 | case iw_F2I16_type: |
| 2366 | val = nios2_assemble_expression (token, insn, |
| 2367 | BFD_RELOC_16_PCREL, 1); |
| 2368 | insn->constant_bits |= SET_IW_F2I16_IMM16 (val); |
| 2369 | break; |
| 2370 | default: |
| 2371 | bad_opcode (op); |
| 2372 | } |
| 2373 | } |
| 2374 | |
| 2375 | /* 10-bit signed address offset with 1-bit shift. */ |
| 2376 | static void |
| 2377 | nios2_assemble_arg_O (const char *token, nios2_insn_infoS *insn) |
| 2378 | { |
| 2379 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2380 | unsigned int val; |
| 2381 | |
| 2382 | switch (op->format) |
| 2383 | { |
| 2384 | case iw_I10_type: |
| 2385 | val = nios2_assemble_expression (token, insn, |
| 2386 | BFD_RELOC_NIOS2_R2_I10_1_PCREL, 1); |
| 2387 | insn->constant_bits |= SET_IW_I10_IMM10 (val >> 1); |
| 2388 | break; |
| 2389 | default: |
| 2390 | bad_opcode (op); |
| 2391 | } |
| 2392 | } |
| 2393 | |
| 2394 | /* 7-bit signed address offset with 1-bit shift. */ |
| 2395 | static void |
| 2396 | nios2_assemble_arg_P (const char *token, nios2_insn_infoS *insn) |
| 2397 | { |
| 2398 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2399 | unsigned int val; |
| 2400 | |
| 2401 | switch (op->format) |
| 2402 | { |
| 2403 | case iw_T1I7_type: |
| 2404 | val = nios2_assemble_expression (token, insn, |
| 2405 | BFD_RELOC_NIOS2_R2_T1I7_1_PCREL, 1); |
| 2406 | insn->constant_bits |= SET_IW_T1I7_IMM7 (val >> 1); |
| 2407 | break; |
| 2408 | default: |
| 2409 | bad_opcode (op); |
| 2410 | } |
| 2411 | } |
| 2412 | |
| 2413 | /* 5-bit unsigned immediate. */ |
| 2414 | static void |
| 2415 | nios2_assemble_arg_j (const char *token, nios2_insn_infoS *insn) |
| 2416 | { |
| 2417 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2418 | unsigned int val; |
| 2419 | |
| 2420 | switch (op->format) |
| 2421 | { |
| 2422 | case iw_r_type: |
| 2423 | val = nios2_assemble_expression (token, insn, |
| 2424 | BFD_RELOC_NIOS2_IMM5, 0); |
| 2425 | insn->constant_bits |= SET_IW_R_IMM5 (val); |
| 2426 | break; |
| 2427 | case iw_F3X6L5_type: |
| 2428 | if (op->match == MATCH_R2_ENI) |
| 2429 | /* Value must be constant 0 or 1. */ |
| 2430 | { |
| 2431 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); |
| 2432 | if (val != 0 && val != 1) |
| 2433 | as_bad ("invalid eni argument %u", val); |
| 2434 | insn->insn_code |= SET_IW_F3X6L5_IMM5 (val); |
| 2435 | } |
| 2436 | else |
| 2437 | { |
| 2438 | val = nios2_assemble_expression (token, insn, |
| 2439 | BFD_RELOC_NIOS2_IMM5, 0); |
| 2440 | insn->constant_bits |= SET_IW_F3X6L5_IMM5 (val); |
| 2441 | } |
| 2442 | break; |
| 2443 | case iw_F2X6L10_type: |
| 2444 | /* Only constant expression without relocation permitted for |
| 2445 | bit position. */ |
| 2446 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); |
| 2447 | if (val > 31) |
| 2448 | as_bad ("invalid bit position %u", val); |
| 2449 | insn->insn_code |= SET_IW_F2X6L10_MSB (val); |
| 2450 | break; |
| 2451 | case iw_X2L5_type: |
| 2452 | val = nios2_assemble_expression (token, insn, |
| 2453 | BFD_RELOC_NIOS2_R2_X2L5, 0); |
| 2454 | insn->constant_bits |= SET_IW_X2L5_IMM5 (val); |
| 2455 | break; |
| 2456 | default: |
| 2457 | bad_opcode (op); |
| 2458 | } |
| 2459 | } |
| 2460 | |
| 2461 | /* Second 5-bit unsigned immediate field. */ |
| 2462 | static void |
| 2463 | nios2_assemble_arg_k (const char *token, nios2_insn_infoS *insn) |
| 2464 | { |
| 2465 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2466 | unsigned int val; |
| 2467 | |
| 2468 | switch (op->format) |
| 2469 | { |
| 2470 | case iw_F2X6L10_type: |
| 2471 | /* Only constant expression without relocation permitted for |
| 2472 | bit position. */ |
| 2473 | val = nios2_assemble_expression (token, insn, |
| 2474 | BFD_RELOC_NONE, 0); |
| 2475 | if (val > 31) |
| 2476 | as_bad ("invalid bit position %u", val); |
| 2477 | else if (GET_IW_F2X6L10_MSB (insn->insn_code) < val) |
| 2478 | as_bad ("MSB must be greater than or equal to LSB"); |
| 2479 | insn->insn_code |= SET_IW_F2X6L10_LSB (val); |
| 2480 | break; |
| 2481 | default: |
| 2482 | bad_opcode (op); |
| 2483 | } |
| 2484 | } |
| 2485 | |
| 2486 | /* 8-bit unsigned immediate. */ |
| 2487 | static void |
| 2488 | nios2_assemble_arg_l (const char *token, nios2_insn_infoS *insn) |
| 2489 | { |
| 2490 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2491 | unsigned int val; |
| 2492 | |
| 2493 | switch (op->format) |
| 2494 | { |
| 2495 | case iw_custom_type: |
| 2496 | val = nios2_assemble_expression (token, insn, |
| 2497 | BFD_RELOC_NIOS2_IMM8, 0); |
| 2498 | insn->constant_bits |= SET_IW_CUSTOM_N (val); |
| 2499 | break; |
| 2500 | case iw_F3X8_type: |
| 2501 | val = nios2_assemble_expression (token, insn, |
| 2502 | BFD_RELOC_NIOS2_IMM8, 0); |
| 2503 | insn->constant_bits |= SET_IW_F3X8_N (val); |
| 2504 | break; |
| 2505 | default: |
| 2506 | bad_opcode (op); |
| 2507 | } |
| 2508 | } |
| 2509 | |
| 2510 | /* 26-bit unsigned immediate. */ |
| 2511 | static void |
| 2512 | nios2_assemble_arg_m (const char *token, nios2_insn_infoS *insn) |
| 2513 | { |
| 2514 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2515 | unsigned int val; |
| 2516 | |
| 2517 | switch (op->format) |
| 2518 | { |
| 2519 | case iw_j_type: |
| 2520 | val = nios2_assemble_expression (token, insn, |
| 2521 | (nios2_as_options.noat |
| 2522 | ? BFD_RELOC_NIOS2_CALL26_NOAT |
| 2523 | : BFD_RELOC_NIOS2_CALL26), |
| 2524 | 0); |
| 2525 | insn->constant_bits |= SET_IW_J_IMM26 (val); |
| 2526 | break; |
| 2527 | case iw_L26_type: |
| 2528 | val = nios2_assemble_expression (token, insn, |
| 2529 | (nios2_as_options.noat |
| 2530 | ? BFD_RELOC_NIOS2_CALL26_NOAT |
| 2531 | : BFD_RELOC_NIOS2_CALL26), |
| 2532 | 0); |
| 2533 | insn->constant_bits |= SET_IW_L26_IMM26 (val); |
| 2534 | break; |
| 2535 | default: |
| 2536 | bad_opcode (op); |
| 2537 | } |
| 2538 | } |
| 2539 | |
| 2540 | /* 6-bit unsigned immediate with no shifting. */ |
| 2541 | static void |
| 2542 | nios2_assemble_arg_M (const char *token, nios2_insn_infoS *insn) |
| 2543 | { |
| 2544 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2545 | unsigned int val; |
| 2546 | |
| 2547 | switch (op->format) |
| 2548 | { |
| 2549 | case iw_T1X1I6_type: |
| 2550 | val = nios2_assemble_expression (token, insn, |
| 2551 | BFD_RELOC_NIOS2_R2_T1X1I6, 0); |
| 2552 | insn->constant_bits |= SET_IW_T1X1I6_IMM6 (val); |
| 2553 | break; |
| 2554 | default: |
| 2555 | bad_opcode (op); |
| 2556 | } |
| 2557 | } |
| 2558 | |
| 2559 | /* 6-bit unsigned immediate with 2-bit shift. */ |
| 2560 | static void |
| 2561 | nios2_assemble_arg_N (const char *token, nios2_insn_infoS *insn) |
| 2562 | { |
| 2563 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2564 | unsigned int val; |
| 2565 | |
| 2566 | switch (op->format) |
| 2567 | { |
| 2568 | case iw_T1X1I6_type: |
| 2569 | val = nios2_assemble_expression (token, insn, |
| 2570 | BFD_RELOC_NIOS2_R2_T1X1I6_2, 0); |
| 2571 | insn->constant_bits |= SET_IW_T1X1I6_IMM6 (val >> 2); |
| 2572 | break; |
| 2573 | default: |
| 2574 | bad_opcode (op); |
| 2575 | } |
| 2576 | } |
| 2577 | |
| 2578 | |
| 2579 | /* Encoded enumeration for addi.n/subi.n. */ |
| 2580 | static void |
| 2581 | nios2_assemble_arg_e (const char *token, nios2_insn_infoS *insn) |
| 2582 | { |
| 2583 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2584 | unsigned int val; |
| 2585 | int i; |
| 2586 | |
| 2587 | switch (op->format) |
| 2588 | { |
| 2589 | case iw_T2X1I3_type: |
| 2590 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); |
| 2591 | for (i = 0; i < nios2_num_r2_asi_n_mappings; i++) |
| 2592 | if (val == nios2_r2_asi_n_mappings[i]) |
| 2593 | break; |
| 2594 | if (i == nios2_num_r2_asi_n_mappings) |
| 2595 | { |
| 2596 | as_bad (_("Invalid constant operand %s"), token); |
| 2597 | return; |
| 2598 | } |
| 2599 | insn->insn_code |= SET_IW_T2X1I3_IMM3 ((unsigned)i); |
| 2600 | break; |
| 2601 | default: |
| 2602 | bad_opcode (op); |
| 2603 | } |
| 2604 | } |
| 2605 | |
| 2606 | /* Encoded enumeration for slli.n/srli.n. */ |
| 2607 | static void |
| 2608 | nios2_assemble_arg_f (const char *token, nios2_insn_infoS *insn) |
| 2609 | { |
| 2610 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2611 | unsigned int val; |
| 2612 | int i; |
| 2613 | |
| 2614 | switch (op->format) |
| 2615 | { |
| 2616 | case iw_T2X1L3_type: |
| 2617 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); |
| 2618 | for (i = 0; i < nios2_num_r2_shi_n_mappings; i++) |
| 2619 | if (val == nios2_r2_shi_n_mappings[i]) |
| 2620 | break; |
| 2621 | if (i == nios2_num_r2_shi_n_mappings) |
| 2622 | { |
| 2623 | as_bad (_("Invalid constant operand %s"), token); |
| 2624 | return; |
| 2625 | } |
| 2626 | insn->insn_code |= SET_IW_T2X1L3_SHAMT ((unsigned)i); |
| 2627 | break; |
| 2628 | default: |
| 2629 | bad_opcode (op); |
| 2630 | } |
| 2631 | } |
| 2632 | |
| 2633 | /* Encoded enumeration for andi.n. */ |
| 2634 | static void |
| 2635 | nios2_assemble_arg_g (const char *token, nios2_insn_infoS *insn) |
| 2636 | { |
| 2637 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2638 | unsigned int val; |
| 2639 | int i; |
| 2640 | |
| 2641 | switch (op->format) |
| 2642 | { |
| 2643 | case iw_T2I4_type: |
| 2644 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); |
| 2645 | for (i = 0; i < nios2_num_r2_andi_n_mappings; i++) |
| 2646 | if (val == nios2_r2_andi_n_mappings[i]) |
| 2647 | break; |
| 2648 | if (i == nios2_num_r2_andi_n_mappings) |
| 2649 | { |
| 2650 | as_bad (_("Invalid constant operand %s"), token); |
| 2651 | return; |
| 2652 | } |
| 2653 | insn->insn_code |= SET_IW_T2I4_IMM4 ((unsigned)i); |
| 2654 | break; |
| 2655 | default: |
| 2656 | bad_opcode (op); |
| 2657 | } |
| 2658 | } |
| 2659 | |
| 2660 | /* Encoded enumeration for movi.n. */ |
| 2661 | static void |
| 2662 | nios2_assemble_arg_h (const char *token, nios2_insn_infoS *insn) |
| 2663 | { |
| 2664 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2665 | unsigned int val; |
| 2666 | int i; |
| 2667 | |
| 2668 | switch (op->format) |
| 2669 | { |
| 2670 | case iw_T1I7_type: |
| 2671 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); |
| 2672 | i = (signed) val; |
| 2673 | if ((signed) i == -1) |
| 2674 | val = 127; |
| 2675 | else if (i == -2) |
| 2676 | val = 126; |
| 2677 | else if (i == 0xff) |
| 2678 | val = 125; |
| 2679 | else if (i < 0 || i > 125) |
| 2680 | { |
| 2681 | as_bad (_("Invalid constant operand %s"), token); |
| 2682 | return; |
| 2683 | } |
| 2684 | insn->insn_code |= SET_IW_T1I7_IMM7 (val); |
| 2685 | break; |
| 2686 | default: |
| 2687 | bad_opcode (op); |
| 2688 | } |
| 2689 | } |
| 2690 | |
| 2691 | /* Encoded REGMASK for ldwm/stwm or push.n/pop.n. */ |
| 2692 | static void |
| 2693 | nios2_assemble_arg_R (const char *token, nios2_insn_infoS *insn) |
| 2694 | { |
| 2695 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2696 | unsigned long mask; |
| 2697 | char *buf = strdup (token); |
| 2698 | unsigned long reglist = nios2_parse_reglist (buf, op); |
| 2699 | free (buf); |
| 2700 | |
| 2701 | if (reglist == 0) |
| 2702 | return; |
| 2703 | |
| 2704 | switch (op->format) |
| 2705 | { |
| 2706 | case iw_F1X4L17_type: |
| 2707 | /* Encoding for ldwm/stwm. */ |
| 2708 | if (reglist & 0x00003ffc) |
| 2709 | mask = reglist >> 2; |
| 2710 | else |
| 2711 | { |
| 2712 | insn->insn_code |= SET_IW_F1X4L17_RS (1); |
| 2713 | mask = (reglist & 0x00ffc000) >> 14; |
| 2714 | if (reglist & (1 << 28)) |
| 2715 | mask |= 1 << 10; |
| 2716 | if (reglist & (1 << 31)) |
| 2717 | mask |= 1 << 11; |
| 2718 | } |
| 2719 | insn->insn_code |= SET_IW_F1X4L17_REGMASK (mask); |
| 2720 | break; |
| 2721 | |
| 2722 | case iw_L5I4X1_type: |
| 2723 | /* Encoding for push.n/pop.n. */ |
| 2724 | if (reglist & (1 << 28)) |
| 2725 | insn->insn_code |= SET_IW_L5I4X1_FP (1); |
| 2726 | mask = reglist & 0x00ff0000; |
| 2727 | if (mask) |
| 2728 | { |
| 2729 | int i; |
| 2730 | |
| 2731 | for (i = 0; i < nios2_num_r2_reg_range_mappings; i++) |
| 2732 | if (nios2_r2_reg_range_mappings[i] == mask) |
| 2733 | break; |
| 2734 | if (i == nios2_num_r2_reg_range_mappings) |
| 2735 | { |
| 2736 | as_bad ("invalid reglist"); |
| 2737 | return; |
| 2738 | } |
| 2739 | insn->insn_code |= SET_IW_L5I4X1_REGRANGE (i); |
| 2740 | insn->insn_code |= SET_IW_L5I4X1_CS (1); |
| 2741 | } |
| 2742 | break; |
| 2743 | |
| 2744 | default: |
| 2745 | bad_opcode (op); |
| 2746 | } |
| 2747 | } |
| 2748 | |
| 2749 | /* Base register for ldwm/stwm. */ |
| 2750 | static void |
| 2751 | nios2_assemble_arg_B (const char *token, nios2_insn_infoS *insn) |
| 2752 | { |
| 2753 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2754 | int direction, writeback, ret; |
| 2755 | char *str = strdup (token); |
| 2756 | struct nios2_reg *reg |
| 2757 | = nios2_parse_base_register (str, &direction, &writeback, &ret); |
| 2758 | |
| 2759 | free (str); |
| 2760 | if (!reg) |
| 2761 | return; |
| 2762 | |
| 2763 | switch (op->format) |
| 2764 | { |
| 2765 | case iw_F1X4L17_type: |
| 2766 | /* For ldwm, check to see if the base register is already inside the |
| 2767 | register list. */ |
| 2768 | if (op->match == MATCH_R2_LDWM |
| 2769 | && (nios2_reglist_mask & (1 << reg->index))) |
| 2770 | { |
| 2771 | as_bad ("invalid base register; %s is inside the reglist", reg->name); |
| 2772 | return; |
| 2773 | } |
| 2774 | |
| 2775 | /* For stwm, ret option is not allowed. */ |
| 2776 | if (op->match == MATCH_R2_STWM && ret) |
| 2777 | { |
| 2778 | as_bad ("invalid option syntax"); |
| 2779 | return; |
| 2780 | } |
| 2781 | |
| 2782 | /* Check that the direction matches the ordering of the reglist. */ |
| 2783 | if (nios2_reglist_dir && direction != nios2_reglist_dir) |
| 2784 | { |
| 2785 | as_bad ("reglist order does not match increment/decrement mode"); |
| 2786 | return; |
| 2787 | } |
| 2788 | |
| 2789 | insn->insn_code |= SET_IW_F1X4L17_A (reg->index); |
| 2790 | if (direction > 0) |
| 2791 | insn->insn_code |= SET_IW_F1X4L17_ID (1); |
| 2792 | if (writeback) |
| 2793 | insn->insn_code |= SET_IW_F1X4L17_WB (1); |
| 2794 | if (ret) |
| 2795 | insn->insn_code |= SET_IW_F1X4L17_PC (1); |
| 2796 | break; |
| 2797 | |
| 2798 | default: |
| 2799 | bad_opcode (op); |
| 2800 | } |
| 2801 | } |
| 2802 | |
| 2803 | static void |
| 2804 | nios2_assemble_args (nios2_insn_infoS *insn) |
| 2805 | { |
| 2806 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 2807 | const char *argptr; |
| 2808 | unsigned int tokidx, ntok; |
| 2809 | |
| 2810 | /* Make sure there are enough arguments. */ |
| 2811 | ntok = (op->pinfo & NIOS2_INSN_OPTARG) ? op->num_args - 1 : op->num_args; |
| 2812 | for (tokidx = 1; tokidx <= ntok; tokidx++) |
| 2813 | if (insn->insn_tokens[tokidx] == NULL) |
| 2814 | { |
| 2815 | as_bad ("missing argument"); |
| 2816 | return; |
| 2817 | } |
| 2818 | |
| 2819 | for (argptr = op->args, tokidx = 1; |
| 2820 | *argptr && insn->insn_tokens[tokidx]; |
| 2821 | argptr++) |
| 2822 | switch (*argptr) |
| 2823 | { |
| 2824 | case ',': |
| 2825 | case '(': |
| 2826 | case ')': |
| 2827 | break; |
| 2828 | |
| 2829 | case 'c': |
| 2830 | nios2_assemble_arg_c (insn->insn_tokens[tokidx++], insn); |
| 2831 | break; |
| 2832 | |
| 2833 | case 'd': |
| 2834 | nios2_assemble_arg_d (insn->insn_tokens[tokidx++], insn); |
| 2835 | break; |
| 2836 | |
| 2837 | case 's': |
| 2838 | nios2_assemble_arg_s (insn->insn_tokens[tokidx++], insn); |
| 2839 | break; |
| 2840 | |
| 2841 | case 't': |
| 2842 | nios2_assemble_arg_t (insn->insn_tokens[tokidx++], insn); |
| 2843 | break; |
| 2844 | |
| 2845 | case 'D': |
| 2846 | nios2_assemble_arg_D (insn->insn_tokens[tokidx++], insn); |
| 2847 | break; |
| 2848 | |
| 2849 | case 'S': |
| 2850 | nios2_assemble_arg_S (insn->insn_tokens[tokidx++], insn); |
| 2851 | break; |
| 2852 | |
| 2853 | case 'T': |
| 2854 | nios2_assemble_arg_T (insn->insn_tokens[tokidx++], insn); |
| 2855 | break; |
| 2856 | |
| 2857 | case 'i': |
| 2858 | nios2_assemble_arg_i (insn->insn_tokens[tokidx++], insn); |
| 2859 | break; |
| 2860 | |
| 2861 | case 'I': |
| 2862 | nios2_assemble_arg_I (insn->insn_tokens[tokidx++], insn); |
| 2863 | break; |
| 2864 | |
| 2865 | case 'u': |
| 2866 | nios2_assemble_arg_u (insn->insn_tokens[tokidx++], insn); |
| 2867 | break; |
| 2868 | |
| 2869 | case 'U': |
| 2870 | nios2_assemble_arg_U (insn->insn_tokens[tokidx++], insn); |
| 2871 | break; |
| 2872 | |
| 2873 | case 'V': |
| 2874 | nios2_assemble_arg_V (insn->insn_tokens[tokidx++], insn); |
| 2875 | break; |
| 2876 | |
| 2877 | case 'W': |
| 2878 | nios2_assemble_arg_W (insn->insn_tokens[tokidx++], insn); |
| 2879 | break; |
| 2880 | |
| 2881 | case 'X': |
| 2882 | nios2_assemble_arg_X (insn->insn_tokens[tokidx++], insn); |
| 2883 | break; |
| 2884 | |
| 2885 | case 'Y': |
| 2886 | nios2_assemble_arg_Y (insn->insn_tokens[tokidx++], insn); |
| 2887 | break; |
| 2888 | |
| 2889 | case 'o': |
| 2890 | nios2_assemble_arg_o (insn->insn_tokens[tokidx++], insn); |
| 2891 | break; |
| 2892 | |
| 2893 | case 'O': |
| 2894 | nios2_assemble_arg_O (insn->insn_tokens[tokidx++], insn); |
| 2895 | break; |
| 2896 | |
| 2897 | case 'P': |
| 2898 | nios2_assemble_arg_P (insn->insn_tokens[tokidx++], insn); |
| 2899 | break; |
| 2900 | |
| 2901 | case 'j': |
| 2902 | nios2_assemble_arg_j (insn->insn_tokens[tokidx++], insn); |
| 2903 | break; |
| 2904 | |
| 2905 | case 'k': |
| 2906 | nios2_assemble_arg_k (insn->insn_tokens[tokidx++], insn); |
| 2907 | break; |
| 2908 | |
| 2909 | case 'l': |
| 2910 | nios2_assemble_arg_l (insn->insn_tokens[tokidx++], insn); |
| 2911 | break; |
| 2912 | |
| 2913 | case 'm': |
| 2914 | nios2_assemble_arg_m (insn->insn_tokens[tokidx++], insn); |
| 2915 | break; |
| 2916 | |
| 2917 | case 'M': |
| 2918 | nios2_assemble_arg_M (insn->insn_tokens[tokidx++], insn); |
| 2919 | break; |
| 2920 | |
| 2921 | case 'N': |
| 2922 | nios2_assemble_arg_N (insn->insn_tokens[tokidx++], insn); |
| 2923 | break; |
| 2924 | |
| 2925 | case 'e': |
| 2926 | nios2_assemble_arg_e (insn->insn_tokens[tokidx++], insn); |
| 2927 | break; |
| 2928 | |
| 2929 | case 'f': |
| 2930 | nios2_assemble_arg_f (insn->insn_tokens[tokidx++], insn); |
| 2931 | break; |
| 2932 | |
| 2933 | case 'g': |
| 2934 | nios2_assemble_arg_g (insn->insn_tokens[tokidx++], insn); |
| 2935 | break; |
| 2936 | |
| 2937 | case 'h': |
| 2938 | nios2_assemble_arg_h (insn->insn_tokens[tokidx++], insn); |
| 2939 | break; |
| 2940 | |
| 2941 | case 'R': |
| 2942 | nios2_assemble_arg_R (insn->insn_tokens[tokidx++], insn); |
| 2943 | break; |
| 2944 | |
| 2945 | case 'B': |
| 2946 | nios2_assemble_arg_B (insn->insn_tokens[tokidx++], insn); |
| 2947 | break; |
| 2948 | |
| 2949 | default: |
| 2950 | bad_opcode (op); |
| 2951 | break; |
| 2952 | } |
| 2953 | |
| 2954 | /* Perform argument checking. */ |
| 2955 | nios2_check_assembly (insn->insn_code | insn->constant_bits, |
| 2956 | insn->insn_tokens[tokidx]); |
| 2957 | } |
| 2958 | |
| 2959 | |
| 2960 | /* The function consume_arg takes a pointer into a string |
| 2961 | of instruction tokens (args) and a pointer into a string |
| 2962 | representing the expected sequence of tokens and separators. |
| 2963 | It checks whether the first argument in argstr is of the |
| 2964 | expected type, throwing an error if it is not, and returns |
| 2965 | the pointer argstr. */ |
| 2966 | static char * |
| 2967 | nios2_consume_arg (char *argstr, const char *parsestr) |
| 2968 | { |
| 2969 | char *temp; |
| 2970 | |
| 2971 | switch (*parsestr) |
| 2972 | { |
| 2973 | case 'c': |
| 2974 | case 'd': |
| 2975 | case 's': |
| 2976 | case 't': |
| 2977 | case 'D': |
| 2978 | case 'S': |
| 2979 | case 'T': |
| 2980 | break; |
| 2981 | |
| 2982 | case 'i': |
| 2983 | case 'u': |
| 2984 | if (*argstr == '%') |
| 2985 | { |
| 2986 | if (nios2_special_relocation_p (argstr)) |
| 2987 | { |
| 2988 | /* We zap the parentheses because we don't want them confused |
| 2989 | with separators. */ |
| 2990 | temp = strchr (argstr, '('); |
| 2991 | if (temp != NULL) |
| 2992 | *temp = ' '; |
| 2993 | temp = strchr (argstr, ')'); |
| 2994 | if (temp != NULL) |
| 2995 | *temp = ' '; |
| 2996 | } |
| 2997 | else |
| 2998 | as_bad (_("badly formed expression near %s"), argstr); |
| 2999 | } |
| 3000 | break; |
| 3001 | case 'm': |
| 3002 | case 'j': |
| 3003 | case 'k': |
| 3004 | case 'l': |
| 3005 | case 'I': |
| 3006 | case 'U': |
| 3007 | case 'V': |
| 3008 | case 'W': |
| 3009 | case 'X': |
| 3010 | case 'Y': |
| 3011 | case 'O': |
| 3012 | case 'P': |
| 3013 | case 'e': |
| 3014 | case 'f': |
| 3015 | case 'g': |
| 3016 | case 'h': |
| 3017 | case 'M': |
| 3018 | case 'N': |
| 3019 | |
| 3020 | /* We can't have %hi, %lo or %hiadj here. */ |
| 3021 | if (*argstr == '%') |
| 3022 | as_bad (_("badly formed expression near %s"), argstr); |
| 3023 | break; |
| 3024 | |
| 3025 | case 'R': |
| 3026 | /* Register list for ldwm/stwm or push.n/pop.n. Replace the commas |
| 3027 | in the list with spaces so we don't confuse them with separators. */ |
| 3028 | if (*argstr != '{') |
| 3029 | { |
| 3030 | as_bad ("missing '{' in register list"); |
| 3031 | break; |
| 3032 | } |
| 3033 | for (temp = argstr + 1; *temp; temp++) |
| 3034 | { |
| 3035 | if (*temp == '}') |
| 3036 | break; |
| 3037 | else if (*temp == ',') |
| 3038 | *temp = ' '; |
| 3039 | } |
| 3040 | if (!*temp) |
| 3041 | { |
| 3042 | as_bad ("missing '}' in register list"); |
| 3043 | break; |
| 3044 | } |
| 3045 | break; |
| 3046 | |
| 3047 | case 'B': |
| 3048 | /* Base register and options for ldwm/stwm. This is the final argument |
| 3049 | and consumes the rest of the argument string; replace commas |
| 3050 | with spaces so that the token splitter doesn't think they are |
| 3051 | separate arguments. */ |
| 3052 | for (temp = argstr; *temp; temp++) |
| 3053 | if (*temp == ',') |
| 3054 | *temp = ' '; |
| 3055 | break; |
| 3056 | |
| 3057 | case 'o': |
| 3058 | case 'E': |
| 3059 | break; |
| 3060 | default: |
| 3061 | BAD_CASE (*parsestr); |
| 3062 | break; |
| 3063 | } |
| 3064 | |
| 3065 | return argstr; |
| 3066 | } |
| 3067 | |
| 3068 | /* The function consume_separator takes a pointer into a string |
| 3069 | of instruction tokens (args) and a pointer into a string representing |
| 3070 | the expected sequence of tokens and separators. It finds the first |
| 3071 | instance of the character pointed to by separator in argstr, and |
| 3072 | returns a pointer to the next element of argstr, which is the |
| 3073 | following token in the sequence. */ |
| 3074 | static char * |
| 3075 | nios2_consume_separator (char *argstr, const char *separator) |
| 3076 | { |
| 3077 | char *p; |
| 3078 | |
| 3079 | /* If we have a opcode reg, expr(reg) type instruction, and |
| 3080 | * we are separating the expr from the (reg), we find the last |
| 3081 | * (, just in case the expression has parentheses. */ |
| 3082 | |
| 3083 | if (*separator == '(') |
| 3084 | p = strrchr (argstr, *separator); |
| 3085 | else |
| 3086 | p = strchr (argstr, *separator); |
| 3087 | |
| 3088 | if (p != NULL) |
| 3089 | *p++ = 0; |
| 3090 | return p; |
| 3091 | } |
| 3092 | |
| 3093 | /* The principal argument parsing function which takes a string argstr |
| 3094 | representing the instruction arguments for insn, and extracts the argument |
| 3095 | tokens matching parsestr into parsed_args. */ |
| 3096 | static void |
| 3097 | nios2_parse_args (nios2_insn_infoS *insn, char *argstr, |
| 3098 | const char *parsestr, char **parsed_args) |
| 3099 | { |
| 3100 | char *p; |
| 3101 | char *end = NULL; |
| 3102 | int i; |
| 3103 | p = argstr; |
| 3104 | i = 0; |
| 3105 | bfd_boolean terminate = FALSE; |
| 3106 | |
| 3107 | /* This rest of this function is it too fragile and it mostly works, |
| 3108 | therefore special case this one. */ |
| 3109 | if (*parsestr == 0 && argstr != 0) |
| 3110 | { |
| 3111 | as_bad (_("too many arguments")); |
| 3112 | parsed_args[0] = NULL; |
| 3113 | return; |
| 3114 | } |
| 3115 | |
| 3116 | while (p != NULL && !terminate && i < NIOS2_MAX_INSN_TOKENS) |
| 3117 | { |
| 3118 | parsed_args[i] = nios2_consume_arg (p, parsestr); |
| 3119 | ++parsestr; |
| 3120 | while (*parsestr == '(' || *parsestr == ')' || *parsestr == ',') |
| 3121 | { |
| 3122 | char *context = p; |
| 3123 | p = nios2_consume_separator (p, parsestr); |
| 3124 | /* Check for missing separators. */ |
| 3125 | if (!p && !(insn->insn_nios2_opcode->pinfo & NIOS2_INSN_OPTARG)) |
| 3126 | { |
| 3127 | as_bad (_("expecting %c near %s"), *parsestr, context); |
| 3128 | break; |
| 3129 | } |
| 3130 | ++parsestr; |
| 3131 | } |
| 3132 | |
| 3133 | if (*parsestr == '\0') |
| 3134 | { |
| 3135 | /* Check that the argument string has no trailing arguments. */ |
| 3136 | end = strpbrk (p, ","); |
| 3137 | if (end != NULL) |
| 3138 | as_bad (_("too many arguments")); |
| 3139 | } |
| 3140 | |
| 3141 | if (*parsestr == '\0' || (p != NULL && *p == '\0')) |
| 3142 | terminate = TRUE; |
| 3143 | ++i; |
| 3144 | } |
| 3145 | |
| 3146 | parsed_args[i] = NULL; |
| 3147 | } |
| 3148 | |
| 3149 | |
| 3150 | \f |
| 3151 | /** Support for pseudo-op parsing. These are macro-like opcodes that |
| 3152 | expand into real insns by suitable fiddling with the operands. */ |
| 3153 | |
| 3154 | /* Append the string modifier to the string contained in the argument at |
| 3155 | parsed_args[ndx]. */ |
| 3156 | static void |
| 3157 | nios2_modify_arg (char **parsed_args, const char *modifier, |
| 3158 | int unused ATTRIBUTE_UNUSED, int ndx) |
| 3159 | { |
| 3160 | char *tmp = parsed_args[ndx]; |
| 3161 | |
| 3162 | parsed_args[ndx] |
| 3163 | = (char *) malloc (strlen (parsed_args[ndx]) + strlen (modifier) + 1); |
| 3164 | strcpy (parsed_args[ndx], tmp); |
| 3165 | strcat (parsed_args[ndx], modifier); |
| 3166 | } |
| 3167 | |
| 3168 | /* Modify parsed_args[ndx] by negating that argument. */ |
| 3169 | static void |
| 3170 | nios2_negate_arg (char **parsed_args, const char *modifier ATTRIBUTE_UNUSED, |
| 3171 | int unused ATTRIBUTE_UNUSED, int ndx) |
| 3172 | { |
| 3173 | char *tmp = parsed_args[ndx]; |
| 3174 | |
| 3175 | parsed_args[ndx] |
| 3176 | = (char *) malloc (strlen ("~(") + strlen (parsed_args[ndx]) + |
| 3177 | strlen (")+1") + 1); |
| 3178 | |
| 3179 | strcpy (parsed_args[ndx], "~("); |
| 3180 | strcat (parsed_args[ndx], tmp); |
| 3181 | strcat (parsed_args[ndx], ")+1"); |
| 3182 | } |
| 3183 | |
| 3184 | /* The function nios2_swap_args swaps the pointers at indices index_1 and |
| 3185 | index_2 in the array parsed_args[] - this is used for operand swapping |
| 3186 | for comparison operations. */ |
| 3187 | static void |
| 3188 | nios2_swap_args (char **parsed_args, const char *unused ATTRIBUTE_UNUSED, |
| 3189 | int index_1, int index_2) |
| 3190 | { |
| 3191 | char *tmp; |
| 3192 | gas_assert (index_1 < NIOS2_MAX_INSN_TOKENS |
| 3193 | && index_2 < NIOS2_MAX_INSN_TOKENS); |
| 3194 | tmp = parsed_args[index_1]; |
| 3195 | parsed_args[index_1] = parsed_args[index_2]; |
| 3196 | parsed_args[index_2] = tmp; |
| 3197 | } |
| 3198 | |
| 3199 | /* This function appends the string appnd to the array of strings in |
| 3200 | parsed_args num times starting at index start in the array. */ |
| 3201 | static void |
| 3202 | nios2_append_arg (char **parsed_args, const char *appnd, int num, |
| 3203 | int start) |
| 3204 | { |
| 3205 | int i, count; |
| 3206 | char *tmp; |
| 3207 | |
| 3208 | gas_assert ((start + num) < NIOS2_MAX_INSN_TOKENS); |
| 3209 | |
| 3210 | if (nios2_mode == NIOS2_MODE_TEST) |
| 3211 | tmp = parsed_args[start]; |
| 3212 | else |
| 3213 | tmp = NULL; |
| 3214 | |
| 3215 | for (i = start, count = num; count > 0; ++i, --count) |
| 3216 | parsed_args[i] = (char *) appnd; |
| 3217 | |
| 3218 | gas_assert (i == (start + num)); |
| 3219 | parsed_args[i] = tmp; |
| 3220 | parsed_args[i + 1] = NULL; |
| 3221 | } |
| 3222 | |
| 3223 | /* This function inserts the string insert num times in the array |
| 3224 | parsed_args, starting at the index start. */ |
| 3225 | static void |
| 3226 | nios2_insert_arg (char **parsed_args, const char *insert, int num, |
| 3227 | int start) |
| 3228 | { |
| 3229 | int i, count; |
| 3230 | |
| 3231 | gas_assert ((start + num) < NIOS2_MAX_INSN_TOKENS); |
| 3232 | |
| 3233 | /* Move the existing arguments up to create space. */ |
| 3234 | for (i = NIOS2_MAX_INSN_TOKENS; i - num >= start; --i) |
| 3235 | parsed_args[i] = parsed_args[i - num]; |
| 3236 | |
| 3237 | for (i = start, count = num; count > 0; ++i, --count) |
| 3238 | parsed_args[i] = (char *) insert; |
| 3239 | } |
| 3240 | |
| 3241 | /* Cleanup function to free malloc'ed arg strings. */ |
| 3242 | static void |
| 3243 | nios2_free_arg (char **parsed_args, int num ATTRIBUTE_UNUSED, int start) |
| 3244 | { |
| 3245 | if (parsed_args[start]) |
| 3246 | { |
| 3247 | free (parsed_args[start]); |
| 3248 | parsed_args[start] = NULL; |
| 3249 | } |
| 3250 | } |
| 3251 | |
| 3252 | /* This function swaps the pseudo-op for a real op. */ |
| 3253 | static nios2_ps_insn_infoS* |
| 3254 | nios2_translate_pseudo_insn (nios2_insn_infoS *insn) |
| 3255 | { |
| 3256 | |
| 3257 | nios2_ps_insn_infoS *ps_insn; |
| 3258 | |
| 3259 | /* Find which real insn the pseudo-op transates to and |
| 3260 | switch the insn_info ptr to point to it. */ |
| 3261 | ps_insn = nios2_ps_lookup (insn->insn_nios2_opcode->name); |
| 3262 | |
| 3263 | if (ps_insn != NULL) |
| 3264 | { |
| 3265 | insn->insn_nios2_opcode = nios2_opcode_lookup (ps_insn->insn); |
| 3266 | insn->insn_tokens[0] = insn->insn_nios2_opcode->name; |
| 3267 | /* Modify the args so they work with the real insn. */ |
| 3268 | ps_insn->arg_modifer_func ((char **) insn->insn_tokens, |
| 3269 | ps_insn->arg_modifier, ps_insn->num, |
| 3270 | ps_insn->index); |
| 3271 | } |
| 3272 | else |
| 3273 | /* we cannot recover from this. */ |
| 3274 | as_fatal (_("unrecognized pseudo-instruction %s"), |
| 3275 | insn->insn_nios2_opcode->name); |
| 3276 | return ps_insn; |
| 3277 | } |
| 3278 | |
| 3279 | /* Invoke the cleanup handler for pseudo-insn ps_insn on insn. */ |
| 3280 | static void |
| 3281 | nios2_cleanup_pseudo_insn (nios2_insn_infoS *insn, |
| 3282 | nios2_ps_insn_infoS *ps_insn) |
| 3283 | { |
| 3284 | if (ps_insn->arg_cleanup_func) |
| 3285 | (ps_insn->arg_cleanup_func) ((char **) insn->insn_tokens, |
| 3286 | ps_insn->num, ps_insn->index); |
| 3287 | } |
| 3288 | |
| 3289 | const nios2_ps_insn_infoS nios2_ps_insn_info_structs[] = { |
| 3290 | /* pseudo-op, real-op, arg, arg_modifier_func, num, index, arg_cleanup_func */ |
| 3291 | {"mov", "add", nios2_append_arg, "zero", 1, 3, NULL}, |
| 3292 | {"movi", "addi", nios2_insert_arg, "zero", 1, 2, NULL}, |
| 3293 | {"movhi", "orhi", nios2_insert_arg, "zero", 1, 2, NULL}, |
| 3294 | {"movui", "ori", nios2_insert_arg, "zero", 1, 2, NULL}, |
| 3295 | {"movia", "orhi", nios2_insert_arg, "zero", 1, 2, NULL}, |
| 3296 | {"nop", "add", nios2_append_arg, "zero", 3, 1, NULL}, |
| 3297 | {"bgt", "blt", nios2_swap_args, "", 1, 2, NULL}, |
| 3298 | {"bgtu", "bltu", nios2_swap_args, "", 1, 2, NULL}, |
| 3299 | {"ble", "bge", nios2_swap_args, "", 1, 2, NULL}, |
| 3300 | {"bleu", "bgeu", nios2_swap_args, "", 1, 2, NULL}, |
| 3301 | {"cmpgt", "cmplt", nios2_swap_args, "", 2, 3, NULL}, |
| 3302 | {"cmpgtu", "cmpltu", nios2_swap_args, "", 2, 3, NULL}, |
| 3303 | {"cmple", "cmpge", nios2_swap_args, "", 2, 3, NULL}, |
| 3304 | {"cmpleu", "cmpgeu", nios2_swap_args, "", 2, 3, NULL}, |
| 3305 | {"cmpgti", "cmpgei", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, |
| 3306 | {"cmpgtui", "cmpgeui", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, |
| 3307 | {"cmplei", "cmplti", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, |
| 3308 | {"cmpleui", "cmpltui", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, |
| 3309 | {"subi", "addi", nios2_negate_arg, "", 0, 3, nios2_free_arg}, |
| 3310 | {"nop.n", "mov.n", nios2_append_arg, "zero", 2, 1, NULL} |
| 3311 | /* Add further pseudo-ops here. */ |
| 3312 | }; |
| 3313 | |
| 3314 | #define NIOS2_NUM_PSEUDO_INSNS \ |
| 3315 | ((sizeof(nios2_ps_insn_info_structs)/ \ |
| 3316 | sizeof(nios2_ps_insn_info_structs[0]))) |
| 3317 | const int nios2_num_ps_insn_info_structs = NIOS2_NUM_PSEUDO_INSNS; |
| 3318 | |
| 3319 | \f |
| 3320 | /** Assembler output support. */ |
| 3321 | |
| 3322 | /* Output a normal instruction. */ |
| 3323 | static void |
| 3324 | output_insn (nios2_insn_infoS *insn) |
| 3325 | { |
| 3326 | char *f; |
| 3327 | nios2_insn_relocS *reloc; |
| 3328 | f = frag_more (insn->insn_nios2_opcode->size); |
| 3329 | /* This allocates enough space for the instruction |
| 3330 | and puts it in the current frag. */ |
| 3331 | md_number_to_chars (f, insn->insn_code, insn->insn_nios2_opcode->size); |
| 3332 | /* Emit debug info. */ |
| 3333 | dwarf2_emit_insn (insn->insn_nios2_opcode->size); |
| 3334 | /* Create any fixups to be acted on later. */ |
| 3335 | |
| 3336 | for (reloc = insn->insn_reloc; reloc != NULL; reloc = reloc->reloc_next) |
| 3337 | fix_new_exp (frag_now, f - frag_now->fr_literal, |
| 3338 | insn->insn_nios2_opcode->size, |
| 3339 | &reloc->reloc_expression, reloc->reloc_pcrel, |
| 3340 | reloc->reloc_type); |
| 3341 | } |
| 3342 | |
| 3343 | /* Output an unconditional branch. */ |
| 3344 | static void |
| 3345 | output_ubranch (nios2_insn_infoS *insn) |
| 3346 | { |
| 3347 | nios2_insn_relocS *reloc = insn->insn_reloc; |
| 3348 | |
| 3349 | /* If the reloc is NULL, there was an error assembling the branch. */ |
| 3350 | if (reloc != NULL) |
| 3351 | { |
| 3352 | symbolS *symp = reloc->reloc_expression.X_add_symbol; |
| 3353 | offsetT offset = reloc->reloc_expression.X_add_number; |
| 3354 | char *f; |
| 3355 | bfd_boolean is_cdx = (insn->insn_nios2_opcode->size == 2); |
| 3356 | |
| 3357 | /* Tag dwarf2 debug info to the address at the start of the insn. |
| 3358 | We must do it before frag_var() below closes off the frag. */ |
| 3359 | dwarf2_emit_insn (0); |
| 3360 | |
| 3361 | /* We create a machine dependent frag which can grow |
| 3362 | to accommodate the largest possible instruction sequence |
| 3363 | this may generate. */ |
| 3364 | f = frag_var (rs_machine_dependent, |
| 3365 | UBRANCH_MAX_SIZE, insn->insn_nios2_opcode->size, |
| 3366 | (is_cdx ? CDX_UBRANCH_SUBTYPE (0) : UBRANCH_SUBTYPE (0)), |
| 3367 | symp, offset, NULL); |
| 3368 | |
| 3369 | md_number_to_chars (f, insn->insn_code, insn->insn_nios2_opcode->size); |
| 3370 | |
| 3371 | /* We leave fixup generation to md_convert_frag. */ |
| 3372 | } |
| 3373 | } |
| 3374 | |
| 3375 | /* Output a conditional branch. */ |
| 3376 | static void |
| 3377 | output_cbranch (nios2_insn_infoS *insn) |
| 3378 | { |
| 3379 | nios2_insn_relocS *reloc = insn->insn_reloc; |
| 3380 | |
| 3381 | /* If the reloc is NULL, there was an error assembling the branch. */ |
| 3382 | if (reloc != NULL) |
| 3383 | { |
| 3384 | symbolS *symp = reloc->reloc_expression.X_add_symbol; |
| 3385 | offsetT offset = reloc->reloc_expression.X_add_number; |
| 3386 | char *f; |
| 3387 | bfd_boolean is_cdx = (insn->insn_nios2_opcode->size == 2); |
| 3388 | |
| 3389 | /* Tag dwarf2 debug info to the address at the start of the insn. |
| 3390 | We must do it before frag_var() below closes off the frag. */ |
| 3391 | dwarf2_emit_insn (0); |
| 3392 | |
| 3393 | /* We create a machine dependent frag which can grow |
| 3394 | to accommodate the largest possible instruction sequence |
| 3395 | this may generate. */ |
| 3396 | f = frag_var (rs_machine_dependent, |
| 3397 | CBRANCH_MAX_SIZE, insn->insn_nios2_opcode->size, |
| 3398 | (is_cdx ? CDX_CBRANCH_SUBTYPE (0) : CBRANCH_SUBTYPE (0)), |
| 3399 | symp, offset, NULL); |
| 3400 | |
| 3401 | md_number_to_chars (f, insn->insn_code, insn->insn_nios2_opcode->size); |
| 3402 | |
| 3403 | /* We leave fixup generation to md_convert_frag. */ |
| 3404 | } |
| 3405 | } |
| 3406 | |
| 3407 | /* Output a call sequence. Since calls are not pc-relative for NIOS2, |
| 3408 | but are page-relative, we cannot tell at any stage in assembly |
| 3409 | whether a call will be out of range since a section may be linked |
| 3410 | at any address. So if we are relaxing, we convert all call instructions |
| 3411 | to long call sequences, and rely on the linker to relax them back to |
| 3412 | short calls. */ |
| 3413 | static void |
| 3414 | output_call (nios2_insn_infoS *insn) |
| 3415 | { |
| 3416 | /* This allocates enough space for the instruction |
| 3417 | and puts it in the current frag. */ |
| 3418 | char *f = frag_more (12); |
| 3419 | nios2_insn_relocS *reloc = insn->insn_reloc; |
| 3420 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 3421 | |
| 3422 | switch (op->format) |
| 3423 | { |
| 3424 | case iw_j_type: |
| 3425 | md_number_to_chars (f, |
| 3426 | (MATCH_R1_ORHI | SET_IW_I_B (AT_REGNUM) |
| 3427 | | SET_IW_I_A (0)), |
| 3428 | 4); |
| 3429 | dwarf2_emit_insn (4); |
| 3430 | fix_new_exp (frag_now, f - frag_now->fr_literal, 4, |
| 3431 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_HI16); |
| 3432 | md_number_to_chars (f + 4, |
| 3433 | (MATCH_R1_ORI | SET_IW_I_B (AT_REGNUM) |
| 3434 | | SET_IW_I_A (AT_REGNUM)), |
| 3435 | 4); |
| 3436 | dwarf2_emit_insn (4); |
| 3437 | fix_new_exp (frag_now, f - frag_now->fr_literal + 4, 4, |
| 3438 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_LO16); |
| 3439 | md_number_to_chars (f + 8, MATCH_R1_CALLR | SET_IW_R_A (AT_REGNUM), 4); |
| 3440 | dwarf2_emit_insn (4); |
| 3441 | break; |
| 3442 | case iw_L26_type: |
| 3443 | md_number_to_chars (f, |
| 3444 | (MATCH_R2_ORHI | SET_IW_F2I16_B (AT_REGNUM) |
| 3445 | | SET_IW_F2I16_A (0)), |
| 3446 | 4); |
| 3447 | dwarf2_emit_insn (4); |
| 3448 | fix_new_exp (frag_now, f - frag_now->fr_literal, 4, |
| 3449 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_HI16); |
| 3450 | md_number_to_chars (f + 4, |
| 3451 | (MATCH_R2_ORI | SET_IW_F2I16_B (AT_REGNUM) |
| 3452 | | SET_IW_F2I16_A (AT_REGNUM)), |
| 3453 | 4); |
| 3454 | dwarf2_emit_insn (4); |
| 3455 | fix_new_exp (frag_now, f - frag_now->fr_literal + 4, 4, |
| 3456 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_LO16); |
| 3457 | md_number_to_chars (f + 8, MATCH_R2_CALLR | SET_IW_F3X6L5_A (AT_REGNUM), |
| 3458 | 4); |
| 3459 | dwarf2_emit_insn (4); |
| 3460 | break; |
| 3461 | default: |
| 3462 | bad_opcode (op); |
| 3463 | } |
| 3464 | } |
| 3465 | |
| 3466 | /* Output a movhi/addi pair for the movia pseudo-op. */ |
| 3467 | static void |
| 3468 | output_movia (nios2_insn_infoS *insn) |
| 3469 | { |
| 3470 | /* This allocates enough space for the instruction |
| 3471 | and puts it in the current frag. */ |
| 3472 | char *f = frag_more (8); |
| 3473 | nios2_insn_relocS *reloc = insn->insn_reloc; |
| 3474 | unsigned long reg, code = 0; |
| 3475 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
| 3476 | |
| 3477 | /* If the reloc is NULL, there was an error assembling the movia. */ |
| 3478 | if (reloc != NULL) |
| 3479 | { |
| 3480 | switch (op->format) |
| 3481 | { |
| 3482 | case iw_i_type: |
| 3483 | reg = GET_IW_I_B (insn->insn_code); |
| 3484 | code = MATCH_R1_ADDI | SET_IW_I_A (reg) | SET_IW_I_B (reg); |
| 3485 | break; |
| 3486 | case iw_F2I16_type: |
| 3487 | reg = GET_IW_F2I16_B (insn->insn_code); |
| 3488 | code = MATCH_R2_ADDI | SET_IW_F2I16_A (reg) | SET_IW_F2I16_B (reg); |
| 3489 | break; |
| 3490 | default: |
| 3491 | bad_opcode (op); |
| 3492 | } |
| 3493 | |
| 3494 | md_number_to_chars (f, insn->insn_code, 4); |
| 3495 | dwarf2_emit_insn (4); |
| 3496 | fix_new (frag_now, f - frag_now->fr_literal, 4, |
| 3497 | reloc->reloc_expression.X_add_symbol, |
| 3498 | reloc->reloc_expression.X_add_number, 0, |
| 3499 | BFD_RELOC_NIOS2_HIADJ16); |
| 3500 | md_number_to_chars (f + 4, code, 4); |
| 3501 | dwarf2_emit_insn (4); |
| 3502 | fix_new (frag_now, f + 4 - frag_now->fr_literal, 4, |
| 3503 | reloc->reloc_expression.X_add_symbol, |
| 3504 | reloc->reloc_expression.X_add_number, 0, BFD_RELOC_NIOS2_LO16); |
| 3505 | } |
| 3506 | } |
| 3507 | |
| 3508 | |
| 3509 | \f |
| 3510 | /** External interfaces. */ |
| 3511 | |
| 3512 | /* Update the selected architecture based on ARCH, giving an error if |
| 3513 | ARCH is an invalid value. */ |
| 3514 | |
| 3515 | static void |
| 3516 | nios2_use_arch (const char *arch) |
| 3517 | { |
| 3518 | if (strcmp (arch, "nios2") == 0 || strcmp (arch, "r1") == 0) |
| 3519 | { |
| 3520 | nios2_architecture |= EF_NIOS2_ARCH_R1; |
| 3521 | nios2_opcodes = (struct nios2_opcode *) nios2_r1_opcodes; |
| 3522 | nios2_num_opcodes = nios2_num_r1_opcodes; |
| 3523 | nop32 = nop_r1; |
| 3524 | nop16 = NULL; |
| 3525 | return; |
| 3526 | } |
| 3527 | else if (strcmp (arch, "r2") == 0) |
| 3528 | { |
| 3529 | nios2_architecture |= EF_NIOS2_ARCH_R2; |
| 3530 | nios2_opcodes = (struct nios2_opcode *) nios2_r2_opcodes; |
| 3531 | nios2_num_opcodes = nios2_num_r2_opcodes; |
| 3532 | nop32 = nop_r2; |
| 3533 | nop16 = nop_r2_cdx; |
| 3534 | return; |
| 3535 | } |
| 3536 | |
| 3537 | as_bad (_("unknown architecture '%s'"), arch); |
| 3538 | } |
| 3539 | |
| 3540 | /* The following functions are called by machine-independent parts of |
| 3541 | the assembler. */ |
| 3542 | int |
| 3543 | md_parse_option (int c, char *arg ATTRIBUTE_UNUSED) |
| 3544 | { |
| 3545 | switch (c) |
| 3546 | { |
| 3547 | case 'r': |
| 3548 | /* Hidden option for self-test mode. */ |
| 3549 | nios2_mode = NIOS2_MODE_TEST; |
| 3550 | break; |
| 3551 | case OPTION_RELAX_ALL: |
| 3552 | nios2_as_options.relax = relax_all; |
| 3553 | break; |
| 3554 | case OPTION_NORELAX: |
| 3555 | nios2_as_options.relax = relax_none; |
| 3556 | break; |
| 3557 | case OPTION_RELAX_SECTION: |
| 3558 | nios2_as_options.relax = relax_section; |
| 3559 | break; |
| 3560 | case OPTION_EB: |
| 3561 | target_big_endian = 1; |
| 3562 | break; |
| 3563 | case OPTION_EL: |
| 3564 | target_big_endian = 0; |
| 3565 | break; |
| 3566 | case OPTION_MARCH: |
| 3567 | nios2_use_arch (arg); |
| 3568 | break; |
| 3569 | default: |
| 3570 | return 0; |
| 3571 | break; |
| 3572 | } |
| 3573 | |
| 3574 | return 1; |
| 3575 | } |
| 3576 | |
| 3577 | /* Implement TARGET_FORMAT. We can choose to be big-endian or |
| 3578 | little-endian at runtime based on a switch. */ |
| 3579 | const char * |
| 3580 | nios2_target_format (void) |
| 3581 | { |
| 3582 | return target_big_endian ? "elf32-bignios2" : "elf32-littlenios2"; |
| 3583 | } |
| 3584 | |
| 3585 | /* Machine-dependent usage message. */ |
| 3586 | void |
| 3587 | md_show_usage (FILE *stream) |
| 3588 | { |
| 3589 | fprintf (stream, " NIOS2 options:\n" |
| 3590 | " -relax-all replace all branch and call " |
| 3591 | "instructions with jmp and callr sequences\n" |
| 3592 | " -relax-section replace identified out of range " |
| 3593 | "branches with jmp sequences (default)\n" |
| 3594 | " -no-relax do not replace any branches or calls\n" |
| 3595 | " -EB force big-endian byte ordering\n" |
| 3596 | " -EL force little-endian byte ordering\n" |
| 3597 | " -march=ARCH enable instructions from architecture ARCH\n"); |
| 3598 | } |
| 3599 | |
| 3600 | |
| 3601 | /* This function is called once, at assembler startup time. |
| 3602 | It should set up all the tables, etc. that the MD part of the |
| 3603 | assembler will need. */ |
| 3604 | void |
| 3605 | md_begin (void) |
| 3606 | { |
| 3607 | int i; |
| 3608 | const char *inserted; |
| 3609 | |
| 3610 | switch (nios2_architecture) |
| 3611 | { |
| 3612 | default: |
| 3613 | case EF_NIOS2_ARCH_R1: |
| 3614 | bfd_default_set_arch_mach (stdoutput, bfd_arch_nios2, bfd_mach_nios2r1); |
| 3615 | break; |
| 3616 | case EF_NIOS2_ARCH_R2: |
| 3617 | if (target_big_endian) |
| 3618 | as_fatal (_("Big-endian R2 is not supported.")); |
| 3619 | bfd_default_set_arch_mach (stdoutput, bfd_arch_nios2, bfd_mach_nios2r2); |
| 3620 | break; |
| 3621 | } |
| 3622 | |
| 3623 | /* Create and fill a hashtable for the Nios II opcodes, registers and |
| 3624 | arguments. */ |
| 3625 | nios2_opcode_hash = hash_new (); |
| 3626 | nios2_reg_hash = hash_new (); |
| 3627 | nios2_ps_hash = hash_new (); |
| 3628 | |
| 3629 | for (i = 0; i < nios2_num_opcodes; ++i) |
| 3630 | { |
| 3631 | inserted |
| 3632 | = hash_insert (nios2_opcode_hash, nios2_opcodes[i].name, |
| 3633 | (PTR) & nios2_opcodes[i]); |
| 3634 | if (inserted != NULL) |
| 3635 | { |
| 3636 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), |
| 3637 | nios2_opcodes[i].name, inserted); |
| 3638 | /* Probably a memory allocation problem? Give up now. */ |
| 3639 | as_fatal (_("Broken assembler. No assembly attempted.")); |
| 3640 | } |
| 3641 | } |
| 3642 | |
| 3643 | for (i = 0; i < nios2_num_regs; ++i) |
| 3644 | { |
| 3645 | inserted |
| 3646 | = hash_insert (nios2_reg_hash, nios2_regs[i].name, |
| 3647 | (PTR) & nios2_regs[i]); |
| 3648 | if (inserted != NULL) |
| 3649 | { |
| 3650 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), |
| 3651 | nios2_regs[i].name, inserted); |
| 3652 | /* Probably a memory allocation problem? Give up now. */ |
| 3653 | as_fatal (_("Broken assembler. No assembly attempted.")); |
| 3654 | } |
| 3655 | |
| 3656 | } |
| 3657 | |
| 3658 | for (i = 0; i < nios2_num_ps_insn_info_structs; ++i) |
| 3659 | { |
| 3660 | inserted |
| 3661 | = hash_insert (nios2_ps_hash, nios2_ps_insn_info_structs[i].pseudo_insn, |
| 3662 | (PTR) & nios2_ps_insn_info_structs[i]); |
| 3663 | if (inserted != NULL) |
| 3664 | { |
| 3665 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), |
| 3666 | nios2_ps_insn_info_structs[i].pseudo_insn, inserted); |
| 3667 | /* Probably a memory allocation problem? Give up now. */ |
| 3668 | as_fatal (_("Broken assembler. No assembly attempted.")); |
| 3669 | } |
| 3670 | } |
| 3671 | |
| 3672 | /* Assembler option defaults. */ |
| 3673 | nios2_as_options.noat = FALSE; |
| 3674 | nios2_as_options.nobreak = FALSE; |
| 3675 | |
| 3676 | /* Debug information is incompatible with relaxation. */ |
| 3677 | if (debug_type != DEBUG_UNSPECIFIED) |
| 3678 | nios2_as_options.relax = relax_none; |
| 3679 | |
| 3680 | /* Initialize the alignment data. */ |
| 3681 | nios2_current_align_seg = now_seg; |
| 3682 | nios2_last_label = NULL; |
| 3683 | nios2_current_align = 0; |
| 3684 | nios2_min_align = 2; |
| 3685 | } |
| 3686 | |
| 3687 | |
| 3688 | /* Assembles a single line of Nios II assembly language. */ |
| 3689 | void |
| 3690 | md_assemble (char *op_str) |
| 3691 | { |
| 3692 | char *argstr; |
| 3693 | char *op_strdup = NULL; |
| 3694 | unsigned long saved_pinfo = 0; |
| 3695 | nios2_insn_infoS thisinsn; |
| 3696 | nios2_insn_infoS *insn = &thisinsn; |
| 3697 | |
| 3698 | /* Make sure we are aligned on an appropriate boundary. */ |
| 3699 | if (nios2_current_align < nios2_min_align) |
| 3700 | nios2_align (nios2_min_align, NULL, nios2_last_label); |
| 3701 | else if (nios2_current_align > nios2_min_align) |
| 3702 | nios2_current_align = nios2_min_align; |
| 3703 | nios2_last_label = NULL; |
| 3704 | |
| 3705 | /* We don't want to clobber to op_str |
| 3706 | because we want to be able to use it in messages. */ |
| 3707 | op_strdup = strdup (op_str); |
| 3708 | insn->insn_tokens[0] = strtok (op_strdup, " "); |
| 3709 | argstr = strtok (NULL, ""); |
| 3710 | |
| 3711 | /* Assemble the opcode. */ |
| 3712 | insn->insn_nios2_opcode = nios2_opcode_lookup (insn->insn_tokens[0]); |
| 3713 | insn->insn_reloc = NULL; |
| 3714 | |
| 3715 | if (insn->insn_nios2_opcode != NULL) |
| 3716 | { |
| 3717 | nios2_ps_insn_infoS *ps_insn = NULL; |
| 3718 | |
| 3719 | /* Note if we've seen a 16-bit instruction. */ |
| 3720 | if (insn->insn_nios2_opcode->size == 2) |
| 3721 | nios2_min_align = 1; |
| 3722 | |
| 3723 | /* Set the opcode for the instruction. */ |
| 3724 | insn->insn_code = insn->insn_nios2_opcode->match; |
| 3725 | insn->constant_bits = 0; |
| 3726 | |
| 3727 | /* Parse the arguments pointed to by argstr. */ |
| 3728 | if (nios2_mode == NIOS2_MODE_ASSEMBLE) |
| 3729 | nios2_parse_args (insn, argstr, insn->insn_nios2_opcode->args, |
| 3730 | (char **) &insn->insn_tokens[1]); |
| 3731 | else |
| 3732 | nios2_parse_args (insn, argstr, insn->insn_nios2_opcode->args_test, |
| 3733 | (char **) &insn->insn_tokens[1]); |
| 3734 | |
| 3735 | /* We need to preserve the MOVIA macro as this is clobbered by |
| 3736 | translate_pseudo_insn. */ |
| 3737 | if (insn->insn_nios2_opcode->pinfo == NIOS2_INSN_MACRO_MOVIA) |
| 3738 | saved_pinfo = NIOS2_INSN_MACRO_MOVIA; |
| 3739 | /* If the instruction is an pseudo-instruction, we want to replace it |
| 3740 | with its real equivalent, and then continue. */ |
| 3741 | if ((insn->insn_nios2_opcode->pinfo & NIOS2_INSN_MACRO) |
| 3742 | == NIOS2_INSN_MACRO) |
| 3743 | ps_insn = nios2_translate_pseudo_insn (insn); |
| 3744 | |
| 3745 | /* Assemble the parsed arguments into the instruction word. */ |
| 3746 | nios2_assemble_args (insn); |
| 3747 | |
| 3748 | /* Handle relaxation and other transformations. */ |
| 3749 | if (nios2_as_options.relax != relax_none |
| 3750 | && !nios2_as_options.noat |
| 3751 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_UBRANCH) |
| 3752 | output_ubranch (insn); |
| 3753 | else if (nios2_as_options.relax != relax_none |
| 3754 | && !nios2_as_options.noat |
| 3755 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_CBRANCH) |
| 3756 | output_cbranch (insn); |
| 3757 | else if (nios2_as_options.relax == relax_all |
| 3758 | && !nios2_as_options.noat |
| 3759 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_CALL |
| 3760 | && insn->insn_reloc |
| 3761 | && ((insn->insn_reloc->reloc_type |
| 3762 | == BFD_RELOC_NIOS2_CALL26) |
| 3763 | || (insn->insn_reloc->reloc_type |
| 3764 | == BFD_RELOC_NIOS2_CALL26_NOAT))) |
| 3765 | output_call (insn); |
| 3766 | else if (saved_pinfo == NIOS2_INSN_MACRO_MOVIA) |
| 3767 | output_movia (insn); |
| 3768 | else |
| 3769 | output_insn (insn); |
| 3770 | if (ps_insn) |
| 3771 | nios2_cleanup_pseudo_insn (insn, ps_insn); |
| 3772 | } |
| 3773 | else |
| 3774 | /* Unrecognised instruction - error. */ |
| 3775 | as_bad (_("unrecognised instruction %s"), insn->insn_tokens[0]); |
| 3776 | |
| 3777 | /* Don't leak memory. */ |
| 3778 | free (op_strdup); |
| 3779 | } |
| 3780 | |
| 3781 | /* Round up section size. */ |
| 3782 | valueT |
| 3783 | md_section_align (asection *seg ATTRIBUTE_UNUSED, valueT size) |
| 3784 | { |
| 3785 | /* I think byte alignment is fine here. */ |
| 3786 | return size; |
| 3787 | } |
| 3788 | |
| 3789 | /* Implement TC_FORCE_RELOCATION. */ |
| 3790 | int |
| 3791 | nios2_force_relocation (fixS *fixp) |
| 3792 | { |
| 3793 | if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT |
| 3794 | || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY |
| 3795 | || fixp->fx_r_type == BFD_RELOC_NIOS2_ALIGN) |
| 3796 | return 1; |
| 3797 | |
| 3798 | return generic_force_reloc (fixp); |
| 3799 | } |
| 3800 | |
| 3801 | /* Implement tc_fix_adjustable. */ |
| 3802 | int |
| 3803 | nios2_fix_adjustable (fixS *fixp) |
| 3804 | { |
| 3805 | if (fixp->fx_addsy == NULL) |
| 3806 | return 1; |
| 3807 | |
| 3808 | #ifdef OBJ_ELF |
| 3809 | /* Prevent all adjustments to global symbols. */ |
| 3810 | if (OUTPUT_FLAVOR == bfd_target_elf_flavour |
| 3811 | && (S_IS_EXTERNAL (fixp->fx_addsy) || S_IS_WEAK (fixp->fx_addsy))) |
| 3812 | return 0; |
| 3813 | #endif |
| 3814 | if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT |
| 3815 | || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) |
| 3816 | return 0; |
| 3817 | |
| 3818 | /* Preserve relocations against symbols with function type. */ |
| 3819 | if (symbol_get_bfdsym (fixp->fx_addsy)->flags & BSF_FUNCTION) |
| 3820 | return 0; |
| 3821 | |
| 3822 | /* Don't allow symbols to be discarded on GOT related relocs. */ |
| 3823 | if (fixp->fx_r_type == BFD_RELOC_NIOS2_GOT16 |
| 3824 | || fixp->fx_r_type == BFD_RELOC_NIOS2_CALL16 |
| 3825 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_LO |
| 3826 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_HA |
| 3827 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_GD16 |
| 3828 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LDM16 |
| 3829 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LDO16 |
| 3830 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_IE16 |
| 3831 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LE16 |
| 3832 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPMOD |
| 3833 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPREL |
| 3834 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_TPREL |
| 3835 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF |
| 3836 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOT_LO |
| 3837 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOT_HA |
| 3838 | || fixp->fx_r_type == BFD_RELOC_NIOS2_CALL_LO |
| 3839 | || fixp->fx_r_type == BFD_RELOC_NIOS2_CALL_HA |
| 3840 | ) |
| 3841 | return 0; |
| 3842 | |
| 3843 | return 1; |
| 3844 | } |
| 3845 | |
| 3846 | /* Implement tc_frob_symbol. This is called in adjust_reloc_syms; |
| 3847 | it is used to remove *ABS* references from the symbol table. */ |
| 3848 | int |
| 3849 | nios2_frob_symbol (symbolS *symp) |
| 3850 | { |
| 3851 | if ((OUTPUT_FLAVOR == bfd_target_elf_flavour |
| 3852 | && symp == section_symbol (absolute_section)) |
| 3853 | || !S_IS_DEFINED (symp)) |
| 3854 | return 1; |
| 3855 | else |
| 3856 | return 0; |
| 3857 | } |
| 3858 | |
| 3859 | /* The function tc_gen_reloc creates a relocation structure for the |
| 3860 | fixup fixp, and returns a pointer to it. This structure is passed |
| 3861 | to bfd_install_relocation so that it can be written to the object |
| 3862 | file for linking. */ |
| 3863 | arelent * |
| 3864 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp) |
| 3865 | { |
| 3866 | arelent *reloc = (arelent *) xmalloc (sizeof (arelent)); |
| 3867 | reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); |
| 3868 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); |
| 3869 | |
| 3870 | reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; |
| 3871 | reloc->addend = fixp->fx_offset; /* fixp->fx_addnumber; */ |
| 3872 | |
| 3873 | if (fixp->fx_pcrel) |
| 3874 | { |
| 3875 | switch (fixp->fx_r_type) |
| 3876 | { |
| 3877 | case BFD_RELOC_16: |
| 3878 | fixp->fx_r_type = BFD_RELOC_16_PCREL; |
| 3879 | break; |
| 3880 | case BFD_RELOC_NIOS2_LO16: |
| 3881 | fixp->fx_r_type = BFD_RELOC_NIOS2_PCREL_LO; |
| 3882 | break; |
| 3883 | case BFD_RELOC_NIOS2_HIADJ16: |
| 3884 | fixp->fx_r_type = BFD_RELOC_NIOS2_PCREL_HA; |
| 3885 | break; |
| 3886 | default: |
| 3887 | break; |
| 3888 | } |
| 3889 | } |
| 3890 | |
| 3891 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type); |
| 3892 | if (reloc->howto == NULL) |
| 3893 | { |
| 3894 | as_bad_where (fixp->fx_file, fixp->fx_line, |
| 3895 | _("can't represent relocation type %s"), |
| 3896 | bfd_get_reloc_code_name (fixp->fx_r_type)); |
| 3897 | |
| 3898 | /* Set howto to a garbage value so that we can keep going. */ |
| 3899 | reloc->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_32); |
| 3900 | gas_assert (reloc->howto != NULL); |
| 3901 | } |
| 3902 | return reloc; |
| 3903 | } |
| 3904 | |
| 3905 | long |
| 3906 | md_pcrel_from (fixS *fixP ATTRIBUTE_UNUSED) |
| 3907 | { |
| 3908 | return 0; |
| 3909 | } |
| 3910 | |
| 3911 | /* Called just before the assembler exits. */ |
| 3912 | void |
| 3913 | md_end () |
| 3914 | { |
| 3915 | /* FIXME - not yet implemented */ |
| 3916 | } |
| 3917 | |
| 3918 | /* Under ELF we need to default _GLOBAL_OFFSET_TABLE. |
| 3919 | Otherwise we have no need to default values of symbols. */ |
| 3920 | symbolS * |
| 3921 | md_undefined_symbol (char *name ATTRIBUTE_UNUSED) |
| 3922 | { |
| 3923 | #ifdef OBJ_ELF |
| 3924 | if (name[0] == '_' && name[1] == 'G' |
| 3925 | && strcmp (name, GLOBAL_OFFSET_TABLE_NAME) == 0) |
| 3926 | { |
| 3927 | if (!GOT_symbol) |
| 3928 | { |
| 3929 | if (symbol_find (name)) |
| 3930 | as_bad ("GOT already in the symbol table"); |
| 3931 | |
| 3932 | GOT_symbol = symbol_new (name, undefined_section, |
| 3933 | (valueT) 0, &zero_address_frag); |
| 3934 | } |
| 3935 | |
| 3936 | return GOT_symbol; |
| 3937 | } |
| 3938 | #endif |
| 3939 | |
| 3940 | return 0; |
| 3941 | } |
| 3942 | |
| 3943 | /* Implement tc_frob_label. */ |
| 3944 | void |
| 3945 | nios2_frob_label (symbolS *lab) |
| 3946 | { |
| 3947 | /* Emit dwarf information. */ |
| 3948 | dwarf2_emit_label (lab); |
| 3949 | |
| 3950 | /* Update the label's address with the current output pointer. */ |
| 3951 | symbol_set_frag (lab, frag_now); |
| 3952 | S_SET_VALUE (lab, (valueT) frag_now_fix ()); |
| 3953 | |
| 3954 | /* Record this label for future adjustment after we find out what |
| 3955 | kind of data it references, and the required alignment therewith. */ |
| 3956 | nios2_last_label = lab; |
| 3957 | } |
| 3958 | |
| 3959 | /* Implement md_cons_align. */ |
| 3960 | void |
| 3961 | nios2_cons_align (int size) |
| 3962 | { |
| 3963 | int log_size = 0; |
| 3964 | const char *pfill = NULL; |
| 3965 | |
| 3966 | while ((size >>= 1) != 0) |
| 3967 | ++log_size; |
| 3968 | |
| 3969 | if (subseg_text_p (now_seg)) |
| 3970 | pfill = (const char *) nop32; |
| 3971 | else |
| 3972 | pfill = NULL; |
| 3973 | |
| 3974 | if (nios2_auto_align_on) |
| 3975 | nios2_align (log_size, pfill, NULL); |
| 3976 | |
| 3977 | nios2_last_label = NULL; |
| 3978 | } |
| 3979 | |
| 3980 | /* Map 's' to SHF_NIOS2_GPREL. */ |
| 3981 | /* This is from the Alpha code tc-alpha.c. */ |
| 3982 | int |
| 3983 | nios2_elf_section_letter (int letter, char **ptr_msg) |
| 3984 | { |
| 3985 | if (letter == 's') |
| 3986 | return SHF_NIOS2_GPREL; |
| 3987 | |
| 3988 | *ptr_msg = _("Bad .section directive: want a,s,w,x,M,S,G,T in string"); |
| 3989 | return -1; |
| 3990 | } |
| 3991 | |
| 3992 | /* Map SHF_ALPHA_GPREL to SEC_SMALL_DATA. */ |
| 3993 | /* This is from the Alpha code tc-alpha.c. */ |
| 3994 | flagword |
| 3995 | nios2_elf_section_flags (flagword flags, int attr, int type ATTRIBUTE_UNUSED) |
| 3996 | { |
| 3997 | if (attr & SHF_NIOS2_GPREL) |
| 3998 | flags |= SEC_SMALL_DATA; |
| 3999 | return flags; |
| 4000 | } |
| 4001 | |
| 4002 | /* Implement TC_PARSE_CONS_EXPRESSION to handle %tls_ldo(...) */ |
| 4003 | bfd_reloc_code_real_type |
| 4004 | nios2_cons (expressionS *exp, int size) |
| 4005 | { |
| 4006 | bfd_reloc_code_real_type nios2_tls_ldo_reloc = BFD_RELOC_NONE; |
| 4007 | |
| 4008 | SKIP_WHITESPACE (); |
| 4009 | if (input_line_pointer[0] == '%') |
| 4010 | { |
| 4011 | if (strprefix (input_line_pointer + 1, "tls_ldo")) |
| 4012 | { |
| 4013 | if (size != 4) |
| 4014 | as_bad (_("Illegal operands: %%tls_ldo in %d-byte data field"), |
| 4015 | size); |
| 4016 | else |
| 4017 | { |
| 4018 | input_line_pointer += 8; |
| 4019 | nios2_tls_ldo_reloc = BFD_RELOC_NIOS2_TLS_DTPREL; |
| 4020 | } |
| 4021 | } |
| 4022 | if (nios2_tls_ldo_reloc != BFD_RELOC_NONE) |
| 4023 | { |
| 4024 | SKIP_WHITESPACE (); |
| 4025 | if (input_line_pointer[0] != '(') |
| 4026 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); |
| 4027 | else |
| 4028 | { |
| 4029 | int c; |
| 4030 | char *end = ++input_line_pointer; |
| 4031 | int npar = 0; |
| 4032 | |
| 4033 | for (c = *end; !is_end_of_line[c]; end++, c = *end) |
| 4034 | if (c == '(') |
| 4035 | npar++; |
| 4036 | else if (c == ')') |
| 4037 | { |
| 4038 | if (!npar) |
| 4039 | break; |
| 4040 | npar--; |
| 4041 | } |
| 4042 | |
| 4043 | if (c != ')') |
| 4044 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); |
| 4045 | else |
| 4046 | { |
| 4047 | *end = '\0'; |
| 4048 | expression (exp); |
| 4049 | *end = c; |
| 4050 | if (input_line_pointer != end) |
| 4051 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); |
| 4052 | else |
| 4053 | { |
| 4054 | input_line_pointer++; |
| 4055 | SKIP_WHITESPACE (); |
| 4056 | c = *input_line_pointer; |
| 4057 | if (! is_end_of_line[c] && c != ',') |
| 4058 | as_bad (_("Illegal operands: garbage after %%tls_ldo()")); |
| 4059 | } |
| 4060 | } |
| 4061 | } |
| 4062 | } |
| 4063 | } |
| 4064 | if (nios2_tls_ldo_reloc == BFD_RELOC_NONE) |
| 4065 | expression (exp); |
| 4066 | return nios2_tls_ldo_reloc; |
| 4067 | } |
| 4068 | |
| 4069 | /* Implement HANDLE_ALIGN. */ |
| 4070 | void |
| 4071 | nios2_handle_align (fragS *fragp) |
| 4072 | { |
| 4073 | /* If we are expecting to relax in the linker, then we must output a |
| 4074 | relocation to tell the linker we are aligning code. */ |
| 4075 | if (nios2_as_options.relax == relax_all |
| 4076 | && (fragp->fr_type == rs_align || fragp->fr_type == rs_align_code) |
| 4077 | && fragp->fr_address + fragp->fr_fix > 0 |
| 4078 | && fragp->fr_offset > 1 |
| 4079 | && now_seg != bss_section) |
| 4080 | fix_new (fragp, fragp->fr_fix, 0, &abs_symbol, fragp->fr_offset, 0, |
| 4081 | BFD_RELOC_NIOS2_ALIGN); |
| 4082 | } |
| 4083 | |
| 4084 | /* Implement tc_regname_to_dw2regnum, to convert REGNAME to a DWARF-2 |
| 4085 | register number. */ |
| 4086 | int |
| 4087 | nios2_regname_to_dw2regnum (char *regname) |
| 4088 | { |
| 4089 | struct nios2_reg *r = nios2_reg_lookup (regname); |
| 4090 | if (r == NULL) |
| 4091 | return -1; |
| 4092 | return r->index; |
| 4093 | } |
| 4094 | |
| 4095 | /* Implement tc_cfi_frame_initial_instructions, to initialize the DWARF-2 |
| 4096 | unwind information for this procedure. */ |
| 4097 | void |
| 4098 | nios2_frame_initial_instructions (void) |
| 4099 | { |
| 4100 | cfi_add_CFA_def_cfa (27, 0); |
| 4101 | } |
| 4102 | |
| 4103 | #ifdef OBJ_ELF |
| 4104 | /* Some special processing for a Nios II ELF file. */ |
| 4105 | |
| 4106 | void |
| 4107 | nios2_elf_final_processing (void) |
| 4108 | { |
| 4109 | elf_elfheader (stdoutput)->e_flags = nios2_architecture; |
| 4110 | } |
| 4111 | #endif |