| 1 | /* TI PRU assembler. |
| 2 | Copyright (C) 2014-2016 Free Software Foundation, Inc. |
| 3 | Contributed by Dimitar Dimitrov <dimitar@dinux.eu> |
| 4 | Based on tc-nios2.c |
| 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 "bfd_stdint.h" |
| 25 | #include "opcode/pru.h" |
| 26 | #include "elf/pru.h" |
| 27 | #include "tc-pru.h" |
| 28 | #include "bfd.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 | #error "OBJ_ELF not defined" |
| 37 | #endif |
| 38 | |
| 39 | /* This array holds the chars that always start a comment. If the |
| 40 | pre-processor is disabled, these aren't very useful. */ |
| 41 | const char comment_chars[] = "#;"; |
| 42 | |
| 43 | /* This array holds the chars that only start a comment at the beginning of |
| 44 | a line. If the line seems to have the form '# 123 filename' |
| 45 | .line and .file directives will appear in the pre-processed output. */ |
| 46 | /* Note that input_file.c hand checks for '#' at the beginning of the |
| 47 | first line of the input file. This is because the compiler outputs |
| 48 | #NO_APP at the beginning of its output. */ |
| 49 | /* Also note that C style comments are always supported. */ |
| 50 | const char line_comment_chars[] = "#;*"; |
| 51 | |
| 52 | /* This array holds machine specific line separator characters. */ |
| 53 | const char line_separator_chars[] = ""; |
| 54 | |
| 55 | /* Chars that can be used to separate mant from exp in floating point nums. */ |
| 56 | const char EXP_CHARS[] = "eE"; |
| 57 | |
| 58 | /* Chars that mean this number is a floating point constant. |
| 59 | As in 0f12.456 |
| 60 | or 0d1.2345e12 */ |
| 61 | const char FLT_CHARS[] = "rRsSfFdDxXpP"; |
| 62 | |
| 63 | /* Machine-dependent command-line options. */ |
| 64 | |
| 65 | struct pru_opt_s |
| 66 | { |
| 67 | /* -mno-link-relax / -mlink-relax: generate (or not) |
| 68 | relocations for linker relaxation. */ |
| 69 | bfd_boolean link_relax; |
| 70 | |
| 71 | /* -mno-warn-regname-label: do not output a warning that a label name |
| 72 | matches a register name. */ |
| 73 | bfd_boolean warn_regname_label; |
| 74 | }; |
| 75 | |
| 76 | static struct pru_opt_s pru_opt = { TRUE, TRUE }; |
| 77 | |
| 78 | const char *md_shortopts = "r"; |
| 79 | |
| 80 | enum options |
| 81 | { |
| 82 | OPTION_LINK_RELAX = OPTION_MD_BASE + 1, |
| 83 | OPTION_NO_LINK_RELAX, |
| 84 | OPTION_NO_WARN_REGNAME_LABEL, |
| 85 | }; |
| 86 | |
| 87 | struct option md_longopts[] = { |
| 88 | { "mlink-relax", no_argument, NULL, OPTION_LINK_RELAX }, |
| 89 | { "mno-link-relax", no_argument, NULL, OPTION_NO_LINK_RELAX }, |
| 90 | { "mno-warn-regname-label", no_argument, NULL, |
| 91 | OPTION_NO_WARN_REGNAME_LABEL }, |
| 92 | { NULL, no_argument, NULL, 0 } |
| 93 | }; |
| 94 | |
| 95 | size_t md_longopts_size = sizeof (md_longopts); |
| 96 | |
| 97 | typedef struct pru_insn_reloc |
| 98 | { |
| 99 | /* Any expression in the instruction is parsed into this field, |
| 100 | which is passed to fix_new_exp () to generate a fixup. */ |
| 101 | expressionS reloc_expression; |
| 102 | |
| 103 | /* The type of the relocation to be applied. */ |
| 104 | bfd_reloc_code_real_type reloc_type; |
| 105 | |
| 106 | /* PC-relative. */ |
| 107 | unsigned int reloc_pcrel; |
| 108 | |
| 109 | /* The next relocation to be applied to the instruction. */ |
| 110 | struct pru_insn_reloc *reloc_next; |
| 111 | } pru_insn_relocS; |
| 112 | |
| 113 | /* This struct is used to hold state when assembling instructions. */ |
| 114 | typedef struct pru_insn_info |
| 115 | { |
| 116 | /* Assembled instruction. */ |
| 117 | unsigned long insn_code; |
| 118 | /* Used for assembling LDI32. */ |
| 119 | unsigned long ldi32_imm32; |
| 120 | |
| 121 | /* Pointer to the relevant bit of the opcode table. */ |
| 122 | const struct pru_opcode *insn_pru_opcode; |
| 123 | /* After parsing ptrs to the tokens in the instruction fill this array |
| 124 | it is terminated with a null pointer (hence the first +1). |
| 125 | The second +1 is because in some parts of the code the opcode |
| 126 | is not counted as a token, but still placed in this array. */ |
| 127 | const char *insn_tokens[PRU_MAX_INSN_TOKENS + 1 + 1]; |
| 128 | |
| 129 | /* This holds information used to generate fixups |
| 130 | and eventually relocations if it is not null. */ |
| 131 | pru_insn_relocS *insn_reloc; |
| 132 | } pru_insn_infoS; |
| 133 | |
| 134 | /* Opcode hash table. */ |
| 135 | static struct hash_control *pru_opcode_hash = NULL; |
| 136 | #define pru_opcode_lookup(NAME) \ |
| 137 | ((struct pru_opcode *) hash_find (pru_opcode_hash, (NAME))) |
| 138 | |
| 139 | /* Register hash table. */ |
| 140 | static struct hash_control *pru_reg_hash = NULL; |
| 141 | #define pru_reg_lookup(NAME) \ |
| 142 | ((struct pru_reg *) hash_find (pru_reg_hash, (NAME))) |
| 143 | |
| 144 | /* The known current alignment of the current section. */ |
| 145 | static int pru_current_align; |
| 146 | static segT pru_current_align_seg; |
| 147 | |
| 148 | static int pru_auto_align_on = 1; |
| 149 | |
| 150 | /* The last seen label in the current section. This is used to auto-align |
| 151 | labels preceeding instructions. */ |
| 152 | static symbolS *pru_last_label; |
| 153 | |
| 154 | \f |
| 155 | /** Utility routines. */ |
| 156 | /* Function md_chars_to_number takes the sequence of |
| 157 | bytes in buf and returns the corresponding value |
| 158 | in an int. n must be 1, 2, 4 or 8. */ |
| 159 | static uint64_t |
| 160 | md_chars_to_number (char *buf, int n) |
| 161 | { |
| 162 | int i; |
| 163 | uint64_t val; |
| 164 | |
| 165 | gas_assert (n == 1 || n == 2 || n == 4 || n == 8); |
| 166 | |
| 167 | val = 0; |
| 168 | for (i = 0; i < n; ++i) |
| 169 | val = val | ((buf[i] & 0xff) << 8 * i); |
| 170 | return val; |
| 171 | } |
| 172 | |
| 173 | |
| 174 | /* This function turns a C long int, short int or char |
| 175 | into the series of bytes that represent the number |
| 176 | on the target machine. */ |
| 177 | void |
| 178 | md_number_to_chars (char *buf, uint64_t val, int n) |
| 179 | { |
| 180 | gas_assert (n == 1 || n == 2 || n == 4 || n == 8); |
| 181 | number_to_chars_littleendian (buf, val, n); |
| 182 | } |
| 183 | |
| 184 | /* Turn a string in input_line_pointer into a floating point constant |
| 185 | of type TYPE, and store the appropriate bytes in *LITP. The number |
| 186 | of LITTLENUMS emitted is stored in *SIZEP. An error message is |
| 187 | returned, or NULL on OK. */ |
| 188 | const char * |
| 189 | md_atof (int type, char *litP, int *sizeP) |
| 190 | { |
| 191 | return ieee_md_atof (type, litP, sizeP, FALSE); |
| 192 | } |
| 193 | |
| 194 | /* Return true if STR starts with PREFIX, which should be a string literal. */ |
| 195 | #define strprefix(STR, PREFIX) \ |
| 196 | (strncmp ((STR), PREFIX, strlen (PREFIX)) == 0) |
| 197 | |
| 198 | /* nop fill pattern for text section. */ |
| 199 | static char const nop[4] = { 0xe0, 0xe0, 0xe0, 0x12 }; |
| 200 | |
| 201 | /* Handles all machine-dependent alignment needs. */ |
| 202 | static void |
| 203 | pru_align (int log_size, const char *pfill, symbolS *label) |
| 204 | { |
| 205 | int align; |
| 206 | long max_alignment = 15; |
| 207 | |
| 208 | /* The front end is prone to changing segments out from under us |
| 209 | temporarily when -g is in effect. */ |
| 210 | int switched_seg_p = (pru_current_align_seg != now_seg); |
| 211 | |
| 212 | align = log_size; |
| 213 | if (align > max_alignment) |
| 214 | { |
| 215 | align = max_alignment; |
| 216 | as_bad (_("Alignment too large: %d assumed"), align); |
| 217 | } |
| 218 | else if (align < 0) |
| 219 | { |
| 220 | as_warn (_("Alignment negative: 0 assumed")); |
| 221 | align = 0; |
| 222 | } |
| 223 | |
| 224 | if (align != 0) |
| 225 | { |
| 226 | if (subseg_text_p (now_seg) && align >= 2) |
| 227 | { |
| 228 | /* First, make sure we're on a four-byte boundary, in case |
| 229 | someone has been putting .byte values the text section. */ |
| 230 | if (pru_current_align < 2 || switched_seg_p) |
| 231 | frag_align (2, 0, 0); |
| 232 | |
| 233 | /* Now fill in the alignment pattern. */ |
| 234 | if (pfill != NULL) |
| 235 | frag_align_pattern (align, pfill, sizeof nop, 0); |
| 236 | else |
| 237 | frag_align (align, 0, 0); |
| 238 | } |
| 239 | else |
| 240 | frag_align (align, 0, 0); |
| 241 | |
| 242 | if (!switched_seg_p) |
| 243 | pru_current_align = align; |
| 244 | |
| 245 | /* If the last label was in a different section we can't align it. */ |
| 246 | if (label != NULL && !switched_seg_p) |
| 247 | { |
| 248 | symbolS *sym; |
| 249 | int label_seen = FALSE; |
| 250 | struct frag *old_frag; |
| 251 | valueT old_value; |
| 252 | valueT new_value; |
| 253 | |
| 254 | gas_assert (S_GET_SEGMENT (label) == now_seg); |
| 255 | |
| 256 | old_frag = symbol_get_frag (label); |
| 257 | old_value = S_GET_VALUE (label); |
| 258 | new_value = (valueT) frag_now_fix (); |
| 259 | |
| 260 | /* It is possible to have more than one label at a particular |
| 261 | address, especially if debugging is enabled, so we must |
| 262 | take care to adjust all the labels at this address in this |
| 263 | fragment. To save time we search from the end of the symbol |
| 264 | list, backwards, since the symbols we are interested in are |
| 265 | almost certainly the ones that were most recently added. |
| 266 | Also to save time we stop searching once we have seen at least |
| 267 | one matching label, and we encounter a label that is no longer |
| 268 | in the target fragment. Note, this search is guaranteed to |
| 269 | find at least one match when sym == label, so no special case |
| 270 | code is necessary. */ |
| 271 | for (sym = symbol_lastP; sym != NULL; sym = symbol_previous (sym)) |
| 272 | if (symbol_get_frag (sym) == old_frag |
| 273 | && S_GET_VALUE (sym) == old_value) |
| 274 | { |
| 275 | label_seen = TRUE; |
| 276 | symbol_set_frag (sym, frag_now); |
| 277 | S_SET_VALUE (sym, new_value); |
| 278 | } |
| 279 | else if (label_seen && symbol_get_frag (sym) != old_frag) |
| 280 | break; |
| 281 | } |
| 282 | record_alignment (now_seg, align); |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | \f |
| 287 | /** Support for self-check mode. */ |
| 288 | |
| 289 | /* Mode of the assembler. */ |
| 290 | typedef enum |
| 291 | { |
| 292 | PRU_MODE_ASSEMBLE, /* Ordinary operation. */ |
| 293 | PRU_MODE_TEST /* Hidden mode used for self testing. */ |
| 294 | } PRU_MODE; |
| 295 | |
| 296 | static PRU_MODE pru_mode = PRU_MODE_ASSEMBLE; |
| 297 | |
| 298 | /* This function is used to in self-checking mode |
| 299 | to check the assembled instruction |
| 300 | opcode should be the assembled opcode, and exp_opcode |
| 301 | the parsed string representing the expected opcode. */ |
| 302 | static void |
| 303 | pru_check_assembly (unsigned int opcode, const char *exp_opcode) |
| 304 | { |
| 305 | if (pru_mode == PRU_MODE_TEST) |
| 306 | { |
| 307 | if (exp_opcode == NULL) |
| 308 | as_bad (_("expecting opcode string in self test mode")); |
| 309 | else if (opcode != strtoul (exp_opcode, NULL, 16)) |
| 310 | as_bad (_("assembly 0x%08x, expected %s"), opcode, exp_opcode); |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | \f |
| 315 | /** Support for machine-dependent assembler directives. */ |
| 316 | /* Handle the .align pseudo-op. This aligns to a power of two. It |
| 317 | also adjusts any current instruction label. We treat this the same |
| 318 | way the MIPS port does: .align 0 turns off auto alignment. */ |
| 319 | static void |
| 320 | s_pru_align (int ignore ATTRIBUTE_UNUSED) |
| 321 | { |
| 322 | int align; |
| 323 | char fill; |
| 324 | const char *pfill = NULL; |
| 325 | long max_alignment = 15; |
| 326 | |
| 327 | align = get_absolute_expression (); |
| 328 | if (align > max_alignment) |
| 329 | { |
| 330 | align = max_alignment; |
| 331 | as_bad (_("Alignment too large: %d assumed"), align); |
| 332 | } |
| 333 | else if (align < 0) |
| 334 | { |
| 335 | as_warn (_("Alignment negative: 0 assumed")); |
| 336 | align = 0; |
| 337 | } |
| 338 | |
| 339 | if (*input_line_pointer == ',') |
| 340 | { |
| 341 | input_line_pointer++; |
| 342 | fill = get_absolute_expression (); |
| 343 | pfill = (const char *) &fill; |
| 344 | } |
| 345 | else if (subseg_text_p (now_seg)) |
| 346 | pfill = (const char *) &nop; |
| 347 | else |
| 348 | { |
| 349 | pfill = NULL; |
| 350 | pru_last_label = NULL; |
| 351 | } |
| 352 | |
| 353 | if (align != 0) |
| 354 | { |
| 355 | pru_auto_align_on = 1; |
| 356 | pru_align (align, pfill, pru_last_label); |
| 357 | pru_last_label = NULL; |
| 358 | } |
| 359 | else |
| 360 | pru_auto_align_on = 0; |
| 361 | |
| 362 | demand_empty_rest_of_line (); |
| 363 | } |
| 364 | |
| 365 | /* Handle the .text pseudo-op. This is like the usual one, but it |
| 366 | clears the saved last label and resets known alignment. */ |
| 367 | static void |
| 368 | s_pru_text (int i) |
| 369 | { |
| 370 | s_text (i); |
| 371 | pru_last_label = NULL; |
| 372 | pru_current_align = 0; |
| 373 | pru_current_align_seg = now_seg; |
| 374 | } |
| 375 | |
| 376 | /* Handle the .data pseudo-op. This is like the usual one, but it |
| 377 | clears the saved last label and resets known alignment. */ |
| 378 | static void |
| 379 | s_pru_data (int i) |
| 380 | { |
| 381 | s_data (i); |
| 382 | pru_last_label = NULL; |
| 383 | pru_current_align = 0; |
| 384 | pru_current_align_seg = now_seg; |
| 385 | } |
| 386 | |
| 387 | /* Handle the .section pseudo-op. This is like the usual one, but it |
| 388 | clears the saved last label and resets known alignment. */ |
| 389 | static void |
| 390 | s_pru_section (int ignore) |
| 391 | { |
| 392 | obj_elf_section (ignore); |
| 393 | pru_last_label = NULL; |
| 394 | pru_current_align = 0; |
| 395 | pru_current_align_seg = now_seg; |
| 396 | } |
| 397 | |
| 398 | /* Explicitly unaligned cons. */ |
| 399 | static void |
| 400 | s_pru_ucons (int nbytes) |
| 401 | { |
| 402 | int hold; |
| 403 | hold = pru_auto_align_on; |
| 404 | pru_auto_align_on = 0; |
| 405 | cons (nbytes); |
| 406 | pru_auto_align_on = hold; |
| 407 | } |
| 408 | |
| 409 | /* .set sets assembler options. */ |
| 410 | static void |
| 411 | s_pru_set (int equiv) |
| 412 | { |
| 413 | char *save = input_line_pointer; |
| 414 | char *directive; |
| 415 | char delim = get_symbol_name (&directive); |
| 416 | char *endline = input_line_pointer; |
| 417 | |
| 418 | (void) restore_line_pointer (delim); |
| 419 | |
| 420 | /* We only want to handle ".set XXX" if the |
| 421 | user has tried ".set XXX, YYY" they are not |
| 422 | trying a directive. This prevents |
| 423 | us from polluting the name space. */ |
| 424 | SKIP_WHITESPACE (); |
| 425 | if (is_end_of_line[(unsigned char) *input_line_pointer]) |
| 426 | { |
| 427 | bfd_boolean done = TRUE; |
| 428 | *endline = 0; |
| 429 | |
| 430 | if (!strcmp (directive, "no_warn_regname_label")) |
| 431 | pru_opt.warn_regname_label = FALSE; |
| 432 | else |
| 433 | done = FALSE; |
| 434 | |
| 435 | if (done) |
| 436 | { |
| 437 | *endline = delim; |
| 438 | demand_empty_rest_of_line (); |
| 439 | return; |
| 440 | } |
| 441 | } |
| 442 | |
| 443 | /* If we fall through to here, either we have ".set XXX, YYY" |
| 444 | or we have ".set XXX" where XXX is unknown or we have |
| 445 | a syntax error. */ |
| 446 | input_line_pointer = save; |
| 447 | s_set (equiv); |
| 448 | } |
| 449 | |
| 450 | /* Machine-dependent assembler directives. |
| 451 | Format of each entry is: |
| 452 | { "directive", handler_func, param } */ |
| 453 | const pseudo_typeS md_pseudo_table[] = { |
| 454 | {"align", s_pru_align, 0}, |
| 455 | {"text", s_pru_text, 0}, |
| 456 | {"data", s_pru_data, 0}, |
| 457 | {"section", s_pru_section, 0}, |
| 458 | {"section.s", s_pru_section, 0}, |
| 459 | {"sect", s_pru_section, 0}, |
| 460 | {"sect.s", s_pru_section, 0}, |
| 461 | /* .dword and .half are included for compatibility with MIPS. */ |
| 462 | {"dword", cons, 8}, |
| 463 | {"half", cons, 2}, |
| 464 | /* PRU native word size is 4 bytes, so we override |
| 465 | the GAS default of 2. */ |
| 466 | {"word", cons, 4}, |
| 467 | /* Explicitly unaligned directives. */ |
| 468 | {"2byte", s_pru_ucons, 2}, |
| 469 | {"4byte", s_pru_ucons, 4}, |
| 470 | {"8byte", s_pru_ucons, 8}, |
| 471 | {"16byte", s_pru_ucons, 16}, |
| 472 | {"set", s_pru_set, 0}, |
| 473 | {NULL, NULL, 0} |
| 474 | }; |
| 475 | |
| 476 | \f |
| 477 | int |
| 478 | md_estimate_size_before_relax (fragS *fragp ATTRIBUTE_UNUSED, |
| 479 | asection *seg ATTRIBUTE_UNUSED) |
| 480 | { |
| 481 | abort (); |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | void |
| 486 | md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED, |
| 487 | fragS *fragp ATTRIBUTE_UNUSED) |
| 488 | { |
| 489 | abort (); |
| 490 | } |
| 491 | |
| 492 | \f |
| 493 | static bfd_boolean |
| 494 | relaxable_section (asection *sec) |
| 495 | { |
| 496 | return ((sec->flags & SEC_DEBUGGING) == 0 |
| 497 | && (sec->flags & SEC_CODE) != 0 |
| 498 | && (sec->flags & SEC_ALLOC) != 0); |
| 499 | } |
| 500 | |
| 501 | /* Does whatever the xtensa port does. */ |
| 502 | int |
| 503 | pru_validate_fix_sub (fixS *fix) |
| 504 | { |
| 505 | segT add_symbol_segment, sub_symbol_segment; |
| 506 | |
| 507 | /* The difference of two symbols should be resolved by the assembler when |
| 508 | linkrelax is not set. If the linker may relax the section containing |
| 509 | the symbols, then an Xtensa DIFF relocation must be generated so that |
| 510 | the linker knows to adjust the difference value. */ |
| 511 | if (!linkrelax || fix->fx_addsy == NULL) |
| 512 | return 0; |
| 513 | |
| 514 | /* Make sure both symbols are in the same segment, and that segment is |
| 515 | "normal" and relaxable. If the segment is not "normal", then the |
| 516 | fix is not valid. If the segment is not "relaxable", then the fix |
| 517 | should have been handled earlier. */ |
| 518 | add_symbol_segment = S_GET_SEGMENT (fix->fx_addsy); |
| 519 | if (! SEG_NORMAL (add_symbol_segment) |
| 520 | || ! relaxable_section (add_symbol_segment)) |
| 521 | return 0; |
| 522 | |
| 523 | sub_symbol_segment = S_GET_SEGMENT (fix->fx_subsy); |
| 524 | return (sub_symbol_segment == add_symbol_segment); |
| 525 | } |
| 526 | |
| 527 | /* TC_FORCE_RELOCATION hook. */ |
| 528 | |
| 529 | /* If linkrelax is turned on, and the symbol to relocate |
| 530 | against is in a relaxable segment, don't compute the value - |
| 531 | generate a relocation instead. */ |
| 532 | int |
| 533 | pru_force_relocation (fixS *fix) |
| 534 | { |
| 535 | if (linkrelax && fix->fx_addsy |
| 536 | && relaxable_section (S_GET_SEGMENT (fix->fx_addsy))) |
| 537 | return 1; |
| 538 | |
| 539 | return generic_force_reloc (fix); |
| 540 | } |
| 541 | |
| 542 | |
| 543 | \f |
| 544 | /** Fixups and overflow checking. */ |
| 545 | |
| 546 | /* Check a fixup for overflow. */ |
| 547 | static bfd_reloc_status_type |
| 548 | pru_check_overflow (valueT fixup, reloc_howto_type *howto) |
| 549 | { |
| 550 | bfd_reloc_status_type ret; |
| 551 | |
| 552 | ret = bfd_check_overflow (howto->complain_on_overflow, |
| 553 | howto->bitsize, |
| 554 | howto->rightshift, |
| 555 | bfd_get_reloc_size (howto) * 8, |
| 556 | fixup); |
| 557 | |
| 558 | return ret; |
| 559 | } |
| 560 | |
| 561 | /* Emit diagnostic for fixup overflow. */ |
| 562 | static void |
| 563 | pru_diagnose_overflow (valueT fixup, reloc_howto_type *howto, |
| 564 | fixS *fixP, valueT value) |
| 565 | { |
| 566 | if (fixP->fx_r_type == BFD_RELOC_8 |
| 567 | || fixP->fx_r_type == BFD_RELOC_16 |
| 568 | || fixP->fx_r_type == BFD_RELOC_32) |
| 569 | /* These relocs are against data, not instructions. */ |
| 570 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 571 | _("immediate value 0x%x truncated to 0x%x"), |
| 572 | (unsigned int) fixup, |
| 573 | (unsigned int) (~(~(valueT) 0 << howto->bitsize) & fixup)); |
| 574 | else |
| 575 | { |
| 576 | /* What opcode is the instruction? This will determine |
| 577 | whether we check for overflow in immediate values |
| 578 | and what error message we get. */ |
| 579 | const struct pru_opcode *opcode; |
| 580 | enum overflow_type overflow_msg_type; |
| 581 | unsigned int range_min; |
| 582 | unsigned int range_max; |
| 583 | unsigned int address; |
| 584 | gas_assert (fixP->fx_size == 4); |
| 585 | opcode = pru_find_opcode (value); |
| 586 | gas_assert (opcode); |
| 587 | overflow_msg_type = opcode->overflow_msg; |
| 588 | switch (overflow_msg_type) |
| 589 | { |
| 590 | case call_target_overflow: |
| 591 | range_min |
| 592 | = ((fixP->fx_frag->fr_address + fixP->fx_where) & 0xf0000000); |
| 593 | range_max = range_min + 0x0fffffff; |
| 594 | address = fixup | range_min; |
| 595 | |
| 596 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 597 | _("call target address 0x%08x out of range 0x%08x to 0x%08x"), |
| 598 | address, range_min, range_max); |
| 599 | break; |
| 600 | case qbranch_target_overflow: |
| 601 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 602 | _("quick branch offset %d out of range %d to %d"), |
| 603 | (int)fixup, -((1<<9) * 4), (1 << 9) * 4); |
| 604 | break; |
| 605 | case address_offset_overflow: |
| 606 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 607 | _("%s offset %d out of range %d to %d"), |
| 608 | opcode->name, (int)fixup, -32768, 32767); |
| 609 | break; |
| 610 | case signed_immed16_overflow: |
| 611 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 612 | _("immediate value %d out of range %d to %d"), |
| 613 | (int)fixup, -32768, 32767); |
| 614 | break; |
| 615 | case unsigned_immed32_overflow: |
| 616 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 617 | _("immediate value %llu out of range %u to %lu"), |
| 618 | (unsigned long long)fixup, 0, 0xfffffffflu); |
| 619 | break; |
| 620 | case unsigned_immed16_overflow: |
| 621 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 622 | _("immediate value %u out of range %u to %u"), |
| 623 | (unsigned int)fixup, 0, 65535); |
| 624 | break; |
| 625 | case unsigned_immed5_overflow: |
| 626 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 627 | _("immediate value %u out of range %u to %u"), |
| 628 | (unsigned int)fixup, 0, 31); |
| 629 | break; |
| 630 | default: |
| 631 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 632 | _("overflow in immediate argument")); |
| 633 | break; |
| 634 | } |
| 635 | } |
| 636 | } |
| 637 | |
| 638 | /* Apply a fixup to the object file. */ |
| 639 | void |
| 640 | md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) |
| 641 | { |
| 642 | unsigned char *where; |
| 643 | valueT value = *valP; |
| 644 | long n; |
| 645 | |
| 646 | /* Assert that the fixup is one we can handle. */ |
| 647 | gas_assert (fixP != NULL && valP != NULL |
| 648 | && (fixP->fx_r_type == BFD_RELOC_8 |
| 649 | || fixP->fx_r_type == BFD_RELOC_16 |
| 650 | || fixP->fx_r_type == BFD_RELOC_32 |
| 651 | || fixP->fx_r_type == BFD_RELOC_64 |
| 652 | || fixP->fx_r_type == BFD_RELOC_PRU_LDI32 |
| 653 | || fixP->fx_r_type == BFD_RELOC_PRU_U16 |
| 654 | || fixP->fx_r_type == BFD_RELOC_PRU_U16_PMEMIMM |
| 655 | || fixP->fx_r_type == BFD_RELOC_PRU_S10_PCREL |
| 656 | || fixP->fx_r_type == BFD_RELOC_PRU_U8_PCREL |
| 657 | || fixP->fx_r_type == BFD_RELOC_PRU_32_PMEM |
| 658 | || fixP->fx_r_type == BFD_RELOC_PRU_16_PMEM |
| 659 | /* Add other relocs here as we generate them. */ |
| 660 | )); |
| 661 | |
| 662 | if (fixP->fx_r_type == BFD_RELOC_64) |
| 663 | { |
| 664 | /* We may reach here due to .8byte directives, but we never output |
| 665 | BFD_RELOC_64; it must be resolved. */ |
| 666 | if (fixP->fx_addsy != NULL) |
| 667 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 668 | _("cannot create 64-bit relocation")); |
| 669 | else |
| 670 | { |
| 671 | md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, |
| 672 | *valP, 8); |
| 673 | fixP->fx_done = 1; |
| 674 | } |
| 675 | return; |
| 676 | } |
| 677 | |
| 678 | /* gas_assert (had_errors () || !fixP->fx_subsy); */ |
| 679 | |
| 680 | /* In general, fix instructions with immediate |
| 681 | constants. But leave LDI32 for the linker, |
| 682 | which is prepared to shorten insns. */ |
| 683 | if (fixP->fx_addsy == (symbolS *) NULL |
| 684 | && fixP->fx_r_type != BFD_RELOC_PRU_LDI32) |
| 685 | fixP->fx_done = 1; |
| 686 | |
| 687 | else if (fixP->fx_pcrel) |
| 688 | { |
| 689 | segT s = S_GET_SEGMENT (fixP->fx_addsy); |
| 690 | |
| 691 | if (s == seg || s == absolute_section) |
| 692 | { |
| 693 | /* Blindly copied from AVR, but I don't understand why |
| 694 | this is needed in the first place. Fail hard to catch |
| 695 | when this curious code snippet is utilized. */ |
| 696 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 697 | _("unexpected PC relative expression")); |
| 698 | value += S_GET_VALUE (fixP->fx_addsy); |
| 699 | fixP->fx_done = 1; |
| 700 | } |
| 701 | } |
| 702 | else if (linkrelax && fixP->fx_subsy) |
| 703 | { |
| 704 | /* For a subtraction relocation expression, generate one |
| 705 | of the DIFF relocs, with the value being the difference. |
| 706 | Note that a sym1 - sym2 expression is adjusted into a |
| 707 | section_start_sym + sym4_offset_from_section_start - sym1 |
| 708 | expression. fixP->fx_addsy holds the section start symbol, |
| 709 | fixP->fx_offset holds sym2's offset, and fixP->fx_subsy |
| 710 | holds sym1. Calculate the current difference and write value, |
| 711 | but leave fx_offset as is - during relaxation, |
| 712 | fx_offset - value gives sym1's value. */ |
| 713 | |
| 714 | offsetT diffval; /* valueT is unsigned, so use offsetT. */ |
| 715 | |
| 716 | diffval = S_GET_VALUE (fixP->fx_addsy) |
| 717 | + fixP->fx_offset - S_GET_VALUE (fixP->fx_subsy); |
| 718 | |
| 719 | switch (fixP->fx_r_type) |
| 720 | { |
| 721 | case BFD_RELOC_8: |
| 722 | fixP->fx_r_type = BFD_RELOC_PRU_GNU_DIFF8; |
| 723 | break; |
| 724 | case BFD_RELOC_16: |
| 725 | fixP->fx_r_type = BFD_RELOC_PRU_GNU_DIFF16; |
| 726 | break; |
| 727 | case BFD_RELOC_32: |
| 728 | fixP->fx_r_type = BFD_RELOC_PRU_GNU_DIFF32; |
| 729 | break; |
| 730 | case BFD_RELOC_PRU_16_PMEM: |
| 731 | fixP->fx_r_type = BFD_RELOC_PRU_GNU_DIFF16_PMEM; |
| 732 | if (diffval % 4) |
| 733 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 734 | _("residual low bits in pmem diff relocation")); |
| 735 | diffval /= 4; |
| 736 | break; |
| 737 | case BFD_RELOC_PRU_32_PMEM: |
| 738 | fixP->fx_r_type = BFD_RELOC_PRU_GNU_DIFF32_PMEM; |
| 739 | if (diffval % 4) |
| 740 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 741 | _("residual low bits in pmem diff relocation")); |
| 742 | diffval /= 4; |
| 743 | break; |
| 744 | default: |
| 745 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 746 | _("expression too complex")); |
| 747 | break; |
| 748 | } |
| 749 | |
| 750 | value = *valP = diffval; |
| 751 | |
| 752 | fixP->fx_subsy = NULL; |
| 753 | } |
| 754 | /* We don't actually support subtracting a symbol. */ |
| 755 | if (fixP->fx_subsy != (symbolS *) NULL) |
| 756 | as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex")); |
| 757 | |
| 758 | /* For the DIFF relocs, write the value into the object file while still |
| 759 | keeping fx_done FALSE, as both the difference (recorded in the object file) |
| 760 | and the sym offset (part of fixP) are needed at link relax time. */ |
| 761 | where = (unsigned char *) fixP->fx_frag->fr_literal + fixP->fx_where; |
| 762 | switch (fixP->fx_r_type) |
| 763 | { |
| 764 | case BFD_RELOC_PRU_GNU_DIFF8: |
| 765 | *where = value; |
| 766 | break; |
| 767 | case BFD_RELOC_PRU_GNU_DIFF16: |
| 768 | case BFD_RELOC_PRU_GNU_DIFF16_PMEM: |
| 769 | bfd_putl16 ((bfd_vma) value, where); |
| 770 | break; |
| 771 | case BFD_RELOC_PRU_GNU_DIFF32: |
| 772 | case BFD_RELOC_PRU_GNU_DIFF32_PMEM: |
| 773 | bfd_putl32 ((bfd_vma) value, where); |
| 774 | break; |
| 775 | default: |
| 776 | break; |
| 777 | } |
| 778 | |
| 779 | if (fixP->fx_done) |
| 780 | /* Fully resolved fixup. */ |
| 781 | { |
| 782 | reloc_howto_type *howto |
| 783 | = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); |
| 784 | |
| 785 | if (howto == NULL) |
| 786 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 787 | _("relocation is not supported")); |
| 788 | else |
| 789 | { |
| 790 | valueT fixup = value; |
| 791 | uint64_t insn; |
| 792 | char *buf; |
| 793 | |
| 794 | /* Get the instruction or data to be fixed up. */ |
| 795 | buf = fixP->fx_frag->fr_literal + fixP->fx_where; |
| 796 | insn = md_chars_to_number (buf, fixP->fx_size); |
| 797 | |
| 798 | /* Check for overflow, emitting a diagnostic if necessary. */ |
| 799 | if (pru_check_overflow (fixup, howto) != bfd_reloc_ok) |
| 800 | pru_diagnose_overflow (fixup, howto, fixP, insn); |
| 801 | |
| 802 | /* Apply the right shift. */ |
| 803 | fixup = ((offsetT)fixup) >> howto->rightshift; |
| 804 | |
| 805 | /* Truncate the fixup to right size. */ |
| 806 | n = sizeof (fixup) * 8 - howto->bitsize; |
| 807 | fixup = (fixup << n) >> n; |
| 808 | |
| 809 | /* Fix up the instruction. Non-contiguous bitfields need |
| 810 | special handling. */ |
| 811 | if (fixP->fx_r_type == BFD_RELOC_PRU_S10_PCREL) |
| 812 | SET_BROFF_URAW (insn, fixup); |
| 813 | else if (fixP->fx_r_type == BFD_RELOC_PRU_LDI32) |
| 814 | { |
| 815 | /* As the only 64-bit "insn", LDI32 needs special handling. */ |
| 816 | uint32_t insn1 = insn & 0xffffffff; |
| 817 | uint32_t insn2 = insn >> 32; |
| 818 | SET_INSN_FIELD (IMM16, insn1, fixup & 0xffff); |
| 819 | SET_INSN_FIELD (IMM16, insn2, fixup >> 16); |
| 820 | insn = insn1 | ((uint64_t)insn2 << 32); |
| 821 | } |
| 822 | else |
| 823 | insn = (insn & ~howto->dst_mask) | (fixup << howto->bitpos); |
| 824 | md_number_to_chars (buf, insn, fixP->fx_size); |
| 825 | } |
| 826 | |
| 827 | fixP->fx_done = 1; |
| 828 | } |
| 829 | |
| 830 | if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT) |
| 831 | { |
| 832 | fixP->fx_done = 0; |
| 833 | if (fixP->fx_addsy |
| 834 | && !S_IS_DEFINED (fixP->fx_addsy) && !S_IS_WEAK (fixP->fx_addsy)) |
| 835 | S_SET_WEAK (fixP->fx_addsy); |
| 836 | } |
| 837 | else if (fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) |
| 838 | fixP->fx_done = 0; |
| 839 | } |
| 840 | |
| 841 | |
| 842 | \f |
| 843 | /** Instruction parsing support. */ |
| 844 | |
| 845 | /* Creates a new pru_insn_relocS and returns a pointer to it. */ |
| 846 | static pru_insn_relocS * |
| 847 | pru_insn_reloc_new (bfd_reloc_code_real_type reloc_type, unsigned int pcrel) |
| 848 | { |
| 849 | pru_insn_relocS *retval; |
| 850 | retval = XNEW (pru_insn_relocS); |
| 851 | if (retval == NULL) |
| 852 | { |
| 853 | as_bad (_("can't create relocation")); |
| 854 | abort (); |
| 855 | } |
| 856 | |
| 857 | /* Fill out the fields with default values. */ |
| 858 | retval->reloc_next = NULL; |
| 859 | retval->reloc_type = reloc_type; |
| 860 | retval->reloc_pcrel = pcrel; |
| 861 | return retval; |
| 862 | } |
| 863 | |
| 864 | /* Frees up memory previously allocated by pru_insn_reloc_new (). */ |
| 865 | static void |
| 866 | pru_insn_reloc_destroy (pru_insn_relocS *reloc) |
| 867 | { |
| 868 | pru_insn_relocS *next; |
| 869 | |
| 870 | while (reloc) |
| 871 | { |
| 872 | next = reloc->reloc_next; |
| 873 | free (reloc); |
| 874 | reloc = next; |
| 875 | } |
| 876 | } |
| 877 | |
| 878 | /* The various pru_assemble_* functions call this |
| 879 | function to generate an expression from a string representing an expression. |
| 880 | It then tries to evaluate the expression, and if it can, returns its value. |
| 881 | If not, it creates a new pru_insn_relocS and stores the expression and |
| 882 | reloc_type for future use. */ |
| 883 | static unsigned long |
| 884 | pru_assemble_expression (const char *exprstr, |
| 885 | pru_insn_infoS *insn, |
| 886 | pru_insn_relocS *prev_reloc, |
| 887 | bfd_reloc_code_real_type reloc_type, |
| 888 | unsigned int pcrel) |
| 889 | { |
| 890 | expressionS *ep; |
| 891 | pru_insn_relocS *reloc; |
| 892 | char *saved_line_ptr; |
| 893 | unsigned short value; |
| 894 | |
| 895 | gas_assert (exprstr != NULL); |
| 896 | gas_assert (insn != NULL); |
| 897 | |
| 898 | /* We use this blank keyword to distinguish register from |
| 899 | label operands. */ |
| 900 | if (strstr (exprstr, "%label") != NULL) |
| 901 | { |
| 902 | exprstr += strlen ("%label") + 1; |
| 903 | } |
| 904 | |
| 905 | /* Check for pmem relocation operator. |
| 906 | Change the relocation type and advance the ptr to the start of |
| 907 | the expression proper. */ |
| 908 | if (strstr (exprstr, "%pmem") != NULL) |
| 909 | { |
| 910 | reloc_type = BFD_RELOC_PRU_U16_PMEMIMM; |
| 911 | exprstr += strlen ("%pmem") + 1; |
| 912 | } |
| 913 | |
| 914 | /* We potentially have a relocation. */ |
| 915 | reloc = pru_insn_reloc_new (reloc_type, pcrel); |
| 916 | if (prev_reloc != NULL) |
| 917 | prev_reloc->reloc_next = reloc; |
| 918 | else |
| 919 | insn->insn_reloc = reloc; |
| 920 | |
| 921 | /* Parse the expression string. */ |
| 922 | ep = &reloc->reloc_expression; |
| 923 | saved_line_ptr = input_line_pointer; |
| 924 | input_line_pointer = (char *) exprstr; |
| 925 | SKIP_WHITESPACE (); |
| 926 | expression (ep); |
| 927 | SKIP_WHITESPACE (); |
| 928 | if (*input_line_pointer) |
| 929 | as_bad (_("trailing garbage after expression: %s"), input_line_pointer); |
| 930 | input_line_pointer = saved_line_ptr; |
| 931 | |
| 932 | |
| 933 | if (ep->X_op == O_illegal || ep->X_op == O_absent) |
| 934 | as_bad (_("expected expression, got %s"), exprstr); |
| 935 | |
| 936 | /* This is redundant as the fixup will put this into |
| 937 | the instruction, but it is included here so that |
| 938 | self-test mode (-r) works. */ |
| 939 | value = 0; |
| 940 | if (pru_mode == PRU_MODE_TEST && ep->X_op == O_constant) |
| 941 | value = ep->X_add_number; |
| 942 | |
| 943 | return (unsigned long) value; |
| 944 | } |
| 945 | |
| 946 | /* Try to parse a non-relocatable expression. */ |
| 947 | static unsigned long |
| 948 | pru_assemble_noreloc_expression (const char *exprstr) |
| 949 | { |
| 950 | expressionS exp; |
| 951 | char *saved_line_ptr; |
| 952 | unsigned long val; |
| 953 | |
| 954 | gas_assert (exprstr != NULL); |
| 955 | |
| 956 | saved_line_ptr = input_line_pointer; |
| 957 | input_line_pointer = (char *) exprstr; |
| 958 | SKIP_WHITESPACE (); |
| 959 | expression (&exp); |
| 960 | SKIP_WHITESPACE (); |
| 961 | if (*input_line_pointer) |
| 962 | as_bad (_("trailing garbage after expression: %s"), input_line_pointer); |
| 963 | input_line_pointer = saved_line_ptr; |
| 964 | |
| 965 | val = 0; |
| 966 | if (exp.X_op != O_constant) |
| 967 | as_bad (_("expected constant expression, got %s"), exprstr); |
| 968 | else |
| 969 | val = exp.X_add_number; |
| 970 | |
| 971 | return val; |
| 972 | } |
| 973 | |
| 974 | /* Argument assemble functions. |
| 975 | All take an instruction argument string, and a pointer |
| 976 | to an instruction opcode. Upon return the insn_opcode |
| 977 | has the relevant fields filled in to represent the arg |
| 978 | string. The return value is NULL if successful, or |
| 979 | an error message if an error was detected. */ |
| 980 | |
| 981 | static void |
| 982 | pru_assemble_arg_d (pru_insn_infoS *insn_info, const char *argstr) |
| 983 | { |
| 984 | struct pru_reg *dst = pru_reg_lookup (argstr); |
| 985 | |
| 986 | if (dst == NULL) |
| 987 | as_bad (_("unknown register %s"), argstr); |
| 988 | else |
| 989 | { |
| 990 | SET_INSN_FIELD (RD, insn_info->insn_code, dst->index); |
| 991 | SET_INSN_FIELD (RDSEL, insn_info->insn_code, dst->regsel); |
| 992 | } |
| 993 | } |
| 994 | |
| 995 | static void |
| 996 | pru_assemble_arg_D (pru_insn_infoS *insn_info, const char *argstr) |
| 997 | { |
| 998 | struct pru_reg *dst; |
| 999 | |
| 1000 | /* The leading & before an address register is optional. */ |
| 1001 | if (*argstr == '&') |
| 1002 | argstr++; |
| 1003 | |
| 1004 | dst = pru_reg_lookup (argstr); |
| 1005 | |
| 1006 | if (dst == NULL) |
| 1007 | as_bad (_("unknown register %s"), argstr); |
| 1008 | else |
| 1009 | { |
| 1010 | unsigned long rxb = 0; |
| 1011 | |
| 1012 | switch (dst->regsel) |
| 1013 | { |
| 1014 | case RSEL_31_0: rxb = 0; break; /* whole register defaults to .b0 */ |
| 1015 | case RSEL_7_0: rxb = 0; break; |
| 1016 | case RSEL_15_8: rxb = 1; break; |
| 1017 | case RSEL_23_16: rxb = 2; break; |
| 1018 | case RSEL_31_24: rxb = 3; break; |
| 1019 | default: |
| 1020 | as_bad (_("data transfer register cannot be halfword")); |
| 1021 | } |
| 1022 | |
| 1023 | SET_INSN_FIELD (RD, insn_info->insn_code, dst->index); |
| 1024 | SET_INSN_FIELD (RDB, insn_info->insn_code, rxb); |
| 1025 | } |
| 1026 | } |
| 1027 | |
| 1028 | static void |
| 1029 | pru_assemble_arg_R (pru_insn_infoS *insn_info, const char *argstr) |
| 1030 | { |
| 1031 | struct pru_reg *dst = pru_reg_lookup (argstr); |
| 1032 | |
| 1033 | if (dst == NULL) |
| 1034 | as_bad (_("unknown register %s"), argstr); |
| 1035 | else |
| 1036 | { |
| 1037 | if (dst->regsel != RSEL_31_0) |
| 1038 | { |
| 1039 | as_bad (_("destination register must be full-word")); |
| 1040 | } |
| 1041 | |
| 1042 | SET_INSN_FIELD (RD, insn_info->insn_code, dst->index); |
| 1043 | SET_INSN_FIELD (RDSEL, insn_info->insn_code, dst->regsel); |
| 1044 | } |
| 1045 | } |
| 1046 | |
| 1047 | static void |
| 1048 | pru_assemble_arg_s (pru_insn_infoS *insn_info, const char *argstr) |
| 1049 | { |
| 1050 | struct pru_reg *src1 = pru_reg_lookup (argstr); |
| 1051 | |
| 1052 | if (src1 == NULL) |
| 1053 | as_bad (_("unknown register %s"), argstr); |
| 1054 | else |
| 1055 | { |
| 1056 | SET_INSN_FIELD (RS1, insn_info->insn_code, src1->index); |
| 1057 | SET_INSN_FIELD (RS1SEL, insn_info->insn_code, src1->regsel); |
| 1058 | } |
| 1059 | } |
| 1060 | |
| 1061 | static void |
| 1062 | pru_assemble_arg_S (pru_insn_infoS *insn_info, const char *argstr) |
| 1063 | { |
| 1064 | struct pru_reg *src1 = pru_reg_lookup (argstr); |
| 1065 | |
| 1066 | if (src1 == NULL) |
| 1067 | as_bad (_("unknown register %s"), argstr); |
| 1068 | else |
| 1069 | { |
| 1070 | if (src1->regsel != RSEL_31_0) |
| 1071 | as_bad (_("cannot use partial register %s for addressing"), argstr); |
| 1072 | SET_INSN_FIELD (RS1, insn_info->insn_code, src1->index); |
| 1073 | } |
| 1074 | } |
| 1075 | |
| 1076 | static void |
| 1077 | pru_assemble_arg_b (pru_insn_infoS *insn_info, const char *argstr) |
| 1078 | { |
| 1079 | struct pru_reg *src2 = pru_reg_lookup (argstr); |
| 1080 | if (src2 == NULL) |
| 1081 | { |
| 1082 | unsigned long imm8 = pru_assemble_noreloc_expression (argstr); |
| 1083 | SET_INSN_FIELD (IMM8, insn_info->insn_code, imm8); |
| 1084 | SET_INSN_FIELD (IO, insn_info->insn_code, 1); |
| 1085 | } |
| 1086 | else |
| 1087 | { |
| 1088 | SET_INSN_FIELD (IO, insn_info->insn_code, 0); |
| 1089 | SET_INSN_FIELD (RS2, insn_info->insn_code, src2->index); |
| 1090 | SET_INSN_FIELD (RS2SEL, insn_info->insn_code, src2->regsel); |
| 1091 | } |
| 1092 | |
| 1093 | } |
| 1094 | |
| 1095 | static void |
| 1096 | pru_assemble_arg_B (pru_insn_infoS *insn_info, const char *argstr) |
| 1097 | { |
| 1098 | struct pru_reg *src2 = pru_reg_lookup (argstr); |
| 1099 | if (src2 == NULL) |
| 1100 | { |
| 1101 | unsigned long imm8; |
| 1102 | imm8 = pru_assemble_noreloc_expression (argstr); |
| 1103 | if (!imm8 || imm8 > 0xff) |
| 1104 | as_bad (_("loop count constant %ld is out of range [1..%d]"), |
| 1105 | imm8, 0xff); |
| 1106 | /* Note: HW expects the immediate loop count field |
| 1107 | to be one less than the actual loop count. */ |
| 1108 | SET_INSN_FIELD (IMM8, insn_info->insn_code, imm8 - 1); |
| 1109 | SET_INSN_FIELD (IO, insn_info->insn_code, 1); |
| 1110 | } |
| 1111 | else |
| 1112 | { |
| 1113 | SET_INSN_FIELD (IO, insn_info->insn_code, 0); |
| 1114 | SET_INSN_FIELD (RS2, insn_info->insn_code, src2->index); |
| 1115 | SET_INSN_FIELD (RS2SEL, insn_info->insn_code, src2->regsel); |
| 1116 | } |
| 1117 | } |
| 1118 | |
| 1119 | static void |
| 1120 | pru_assemble_arg_i (pru_insn_infoS *insn_info, const char *argstr) |
| 1121 | { |
| 1122 | unsigned long imm32; |
| 1123 | |
| 1124 | /* We must not generate PRU_LDI32 relocation if relaxation is disabled in |
| 1125 | GAS. Consider the following scenario: GAS relaxation is disabled, so |
| 1126 | DIFF* expressions are fixed and not emitted as relocations. Then if LD |
| 1127 | has relaxation enabled, it may shorten LDI32 but will not update |
| 1128 | accordingly the DIFF expressions. */ |
| 1129 | if (pru_opt.link_relax) |
| 1130 | imm32 = pru_assemble_expression (argstr, insn_info, |
| 1131 | insn_info->insn_reloc, |
| 1132 | BFD_RELOC_PRU_LDI32, 0); |
| 1133 | else |
| 1134 | imm32 = pru_assemble_noreloc_expression (argstr); |
| 1135 | |
| 1136 | /* QUIRK: LDI must clear IO bit high, even though it has immediate arg. */ |
| 1137 | SET_INSN_FIELD (IO, insn_info->insn_code, 0); |
| 1138 | SET_INSN_FIELD (IMM16, insn_info->insn_code, imm32 & 0xffff); |
| 1139 | insn_info->ldi32_imm32 = imm32; |
| 1140 | } |
| 1141 | |
| 1142 | static void |
| 1143 | pru_assemble_arg_j (pru_insn_infoS *insn_info, const char *argstr) |
| 1144 | { |
| 1145 | struct pru_reg *src2 = pru_reg_lookup (argstr); |
| 1146 | |
| 1147 | if (src2 == NULL) |
| 1148 | { |
| 1149 | unsigned long imm16 = pru_assemble_expression (argstr, insn_info, |
| 1150 | insn_info->insn_reloc, |
| 1151 | BFD_RELOC_PRU_U16_PMEMIMM, |
| 1152 | 0); |
| 1153 | SET_INSN_FIELD (IMM16, insn_info->insn_code, imm16); |
| 1154 | SET_INSN_FIELD (IO, insn_info->insn_code, 1); |
| 1155 | } |
| 1156 | else |
| 1157 | { |
| 1158 | SET_INSN_FIELD (IO, insn_info->insn_code, 0); |
| 1159 | SET_INSN_FIELD (RS2, insn_info->insn_code, src2->index); |
| 1160 | SET_INSN_FIELD (RS2SEL, insn_info->insn_code, src2->regsel); |
| 1161 | } |
| 1162 | } |
| 1163 | |
| 1164 | static void |
| 1165 | pru_assemble_arg_W (pru_insn_infoS *insn_info, const char *argstr) |
| 1166 | { |
| 1167 | unsigned long imm16 = pru_assemble_expression (argstr, insn_info, |
| 1168 | insn_info->insn_reloc, |
| 1169 | BFD_RELOC_PRU_U16, 0); |
| 1170 | /* QUIRK: LDI must clear IO bit high, even though it has immediate arg. */ |
| 1171 | SET_INSN_FIELD (IO, insn_info->insn_code, 0); |
| 1172 | SET_INSN_FIELD (IMM16, insn_info->insn_code, imm16); |
| 1173 | } |
| 1174 | |
| 1175 | static void |
| 1176 | pru_assemble_arg_o (pru_insn_infoS *insn_info, const char *argstr) |
| 1177 | { |
| 1178 | unsigned long imm10 = pru_assemble_expression (argstr, insn_info, |
| 1179 | insn_info->insn_reloc, |
| 1180 | BFD_RELOC_PRU_S10_PCREL, 1); |
| 1181 | SET_BROFF_URAW (insn_info->insn_code, imm10); |
| 1182 | } |
| 1183 | |
| 1184 | static void |
| 1185 | pru_assemble_arg_O (pru_insn_infoS *insn_info, const char *argstr) |
| 1186 | { |
| 1187 | unsigned long imm8 = pru_assemble_expression (argstr, insn_info, |
| 1188 | insn_info->insn_reloc, |
| 1189 | BFD_RELOC_PRU_U8_PCREL, 1); |
| 1190 | SET_INSN_FIELD (LOOP_JMPOFFS, insn_info->insn_code, imm8); |
| 1191 | } |
| 1192 | |
| 1193 | static void |
| 1194 | pru_assemble_arg_l (pru_insn_infoS *insn_info, const char *argstr) |
| 1195 | { |
| 1196 | unsigned long burstlen = 0; |
| 1197 | struct pru_reg *blreg = pru_reg_lookup (argstr); |
| 1198 | |
| 1199 | if (blreg == NULL) |
| 1200 | { |
| 1201 | burstlen = pru_assemble_noreloc_expression (argstr); |
| 1202 | if (!burstlen || burstlen > LSSBBO_BYTECOUNT_R0_BITS7_0) |
| 1203 | as_bad (_("byte count constant %ld is out of range [1..%d]"), |
| 1204 | burstlen, LSSBBO_BYTECOUNT_R0_BITS7_0); |
| 1205 | burstlen--; |
| 1206 | } |
| 1207 | else |
| 1208 | { |
| 1209 | if (blreg->index != 0) |
| 1210 | as_bad (_("only r0 can be used as byte count register")); |
| 1211 | else if (blreg->regsel > RSEL_31_24) |
| 1212 | as_bad (_("only r0.bX byte fields of r0 can be used as byte count")); |
| 1213 | else |
| 1214 | burstlen = LSSBBO_BYTECOUNT_R0_BITS7_0 + blreg->regsel; |
| 1215 | } |
| 1216 | SET_BURSTLEN (insn_info->insn_code, burstlen); |
| 1217 | } |
| 1218 | |
| 1219 | static void |
| 1220 | pru_assemble_arg_n (pru_insn_infoS *insn_info, const char *argstr) |
| 1221 | { |
| 1222 | unsigned long burstlen = 0; |
| 1223 | struct pru_reg *blreg = pru_reg_lookup (argstr); |
| 1224 | |
| 1225 | if (blreg == NULL) |
| 1226 | { |
| 1227 | burstlen = pru_assemble_noreloc_expression (argstr); |
| 1228 | if (!burstlen || burstlen > LSSBBO_BYTECOUNT_R0_BITS7_0) |
| 1229 | as_bad (_("byte count constant %ld is out of range [1..%d]"), |
| 1230 | burstlen, LSSBBO_BYTECOUNT_R0_BITS7_0); |
| 1231 | burstlen--; |
| 1232 | } |
| 1233 | else |
| 1234 | { |
| 1235 | if (blreg->index != 0) |
| 1236 | as_bad (_("only r0 can be used as byte count register")); |
| 1237 | else if (blreg->regsel > RSEL_31_24) |
| 1238 | as_bad (_("only r0.bX byte fields of r0 can be used as byte count")); |
| 1239 | else |
| 1240 | burstlen = LSSBBO_BYTECOUNT_R0_BITS7_0 + blreg->regsel; |
| 1241 | } |
| 1242 | SET_INSN_FIELD (XFR_LENGTH, insn_info->insn_code, burstlen); |
| 1243 | } |
| 1244 | |
| 1245 | static void |
| 1246 | pru_assemble_arg_c (pru_insn_infoS *insn_info, const char *argstr) |
| 1247 | { |
| 1248 | unsigned long cb = pru_assemble_noreloc_expression (argstr); |
| 1249 | |
| 1250 | if (cb > 31) |
| 1251 | as_bad (_("invalid constant table offset %ld"), cb); |
| 1252 | else |
| 1253 | SET_INSN_FIELD (CB, insn_info->insn_code, cb); |
| 1254 | } |
| 1255 | |
| 1256 | static void |
| 1257 | pru_assemble_arg_w (pru_insn_infoS *insn_info, const char *argstr) |
| 1258 | { |
| 1259 | unsigned long wk = pru_assemble_noreloc_expression (argstr); |
| 1260 | |
| 1261 | if (wk != 0 && wk != 1) |
| 1262 | as_bad (_("invalid WakeOnStatus %ld"), wk); |
| 1263 | else |
| 1264 | SET_INSN_FIELD (WAKEONSTATUS, insn_info->insn_code, wk); |
| 1265 | } |
| 1266 | |
| 1267 | static void |
| 1268 | pru_assemble_arg_x (pru_insn_infoS *insn_info, const char *argstr) |
| 1269 | { |
| 1270 | unsigned long wba = pru_assemble_noreloc_expression (argstr); |
| 1271 | |
| 1272 | if (wba > 255) |
| 1273 | as_bad (_("invalid XFR WideBus Address %ld"), wba); |
| 1274 | else |
| 1275 | SET_INSN_FIELD (XFR_WBA, insn_info->insn_code, wba); |
| 1276 | } |
| 1277 | |
| 1278 | /* The function consume_arg takes a pointer into a string |
| 1279 | of instruction tokens (args) and a pointer into a string |
| 1280 | representing the expected sequence of tokens and separators. |
| 1281 | It checks whether the first argument in argstr is of the |
| 1282 | expected type, throwing an error if it is not, and returns |
| 1283 | the pointer argstr. */ |
| 1284 | static char * |
| 1285 | pru_consume_arg (char *argstr, const char *parsestr) |
| 1286 | { |
| 1287 | char *temp; |
| 1288 | |
| 1289 | switch (*parsestr) |
| 1290 | { |
| 1291 | case 'W': |
| 1292 | if (*argstr == '%') |
| 1293 | { |
| 1294 | if (strprefix (argstr, "%pmem") || strprefix (argstr, "%label")) |
| 1295 | { |
| 1296 | /* We zap the parentheses because we don't want them confused |
| 1297 | with separators. */ |
| 1298 | temp = strchr (argstr, '('); |
| 1299 | if (temp != NULL) |
| 1300 | *temp = ' '; |
| 1301 | temp = strchr (argstr, ')'); |
| 1302 | if (temp != NULL) |
| 1303 | *temp = ' '; |
| 1304 | } |
| 1305 | else |
| 1306 | as_bad (_("badly formed expression near %s"), argstr); |
| 1307 | } |
| 1308 | break; |
| 1309 | |
| 1310 | case 'j': |
| 1311 | case 'o': |
| 1312 | case 'O': |
| 1313 | if (*argstr == '%') |
| 1314 | { |
| 1315 | /* Only 'j' really requires %label for distinguishing registers |
| 1316 | from labels, but we include 'o' and 'O' here to avoid |
| 1317 | confusing assembler programmers. Thus for completeness all |
| 1318 | jump operands can be prefixed with %label. */ |
| 1319 | if (strprefix (argstr, "%label")) |
| 1320 | { |
| 1321 | /* We zap the parentheses because we don't want them confused |
| 1322 | with separators. */ |
| 1323 | temp = strchr (argstr, '('); |
| 1324 | if (temp != NULL) |
| 1325 | *temp = ' '; |
| 1326 | temp = strchr (argstr, ')'); |
| 1327 | if (temp != NULL) |
| 1328 | *temp = ' '; |
| 1329 | } |
| 1330 | else |
| 1331 | as_bad (_("badly formed expression near %s"), argstr); |
| 1332 | } |
| 1333 | break; |
| 1334 | |
| 1335 | case 'b': |
| 1336 | case 'B': |
| 1337 | case 'c': |
| 1338 | case 'd': |
| 1339 | case 'D': |
| 1340 | case 'E': |
| 1341 | case 'i': |
| 1342 | case 's': |
| 1343 | case 'S': |
| 1344 | case 'l': |
| 1345 | case 'n': |
| 1346 | case 'R': |
| 1347 | case 'w': |
| 1348 | case 'x': |
| 1349 | /* We can't have %pmem here. */ |
| 1350 | if (*argstr == '%') |
| 1351 | as_bad (_("badly formed expression near %s"), argstr); |
| 1352 | break; |
| 1353 | default: |
| 1354 | BAD_CASE (*parsestr); |
| 1355 | break; |
| 1356 | } |
| 1357 | |
| 1358 | return argstr; |
| 1359 | } |
| 1360 | |
| 1361 | /* The function consume_separator takes a pointer into a string |
| 1362 | of instruction tokens (args) and a pointer into a string representing |
| 1363 | the expected sequence of tokens and separators. It finds the first |
| 1364 | instance of the character pointed to by separator in argstr, and |
| 1365 | returns a pointer to the next element of argstr, which is the |
| 1366 | following token in the sequence. */ |
| 1367 | static char * |
| 1368 | pru_consume_separator (char *argstr, const char *separator) |
| 1369 | { |
| 1370 | char *p; |
| 1371 | |
| 1372 | p = strchr (argstr, *separator); |
| 1373 | |
| 1374 | if (p != NULL) |
| 1375 | *p++ = 0; |
| 1376 | else |
| 1377 | as_bad (_("expecting %c near %s"), *separator, argstr); |
| 1378 | return p; |
| 1379 | } |
| 1380 | |
| 1381 | |
| 1382 | /* The principal argument parsing function which takes a string argstr |
| 1383 | representing the instruction arguments for insn, and extracts the argument |
| 1384 | tokens matching parsestr into parsed_args. */ |
| 1385 | static void |
| 1386 | pru_parse_args (pru_insn_infoS *insn ATTRIBUTE_UNUSED, char *argstr, |
| 1387 | const char *parsestr, char **parsed_args) |
| 1388 | { |
| 1389 | char *p; |
| 1390 | char *end = NULL; |
| 1391 | int i; |
| 1392 | p = argstr; |
| 1393 | i = 0; |
| 1394 | bfd_boolean terminate = FALSE; |
| 1395 | |
| 1396 | /* This rest of this function is it too fragile and it mostly works, |
| 1397 | therefore special case this one. */ |
| 1398 | if (*parsestr == 0 && argstr != 0) |
| 1399 | { |
| 1400 | as_bad (_("too many arguments")); |
| 1401 | parsed_args[0] = NULL; |
| 1402 | return; |
| 1403 | } |
| 1404 | |
| 1405 | while (p != NULL && !terminate && i < PRU_MAX_INSN_TOKENS) |
| 1406 | { |
| 1407 | parsed_args[i] = pru_consume_arg (p, parsestr); |
| 1408 | ++parsestr; |
| 1409 | if (*parsestr != '\0') |
| 1410 | { |
| 1411 | p = pru_consume_separator (p, parsestr); |
| 1412 | ++parsestr; |
| 1413 | } |
| 1414 | else |
| 1415 | { |
| 1416 | /* Check that the argument string has no trailing arguments. */ |
| 1417 | /* If we've got a %pmem relocation, we've zapped the parens with |
| 1418 | spaces. */ |
| 1419 | if (strprefix (p, "%pmem") || strprefix (p, "%label")) |
| 1420 | end = strpbrk (p, ","); |
| 1421 | else |
| 1422 | end = strpbrk (p, " ,"); |
| 1423 | |
| 1424 | if (end != NULL) |
| 1425 | as_bad (_("too many arguments")); |
| 1426 | } |
| 1427 | |
| 1428 | if (*parsestr == '\0' || (p != NULL && *p == '\0')) |
| 1429 | terminate = TRUE; |
| 1430 | ++i; |
| 1431 | } |
| 1432 | |
| 1433 | parsed_args[i] = NULL; |
| 1434 | |
| 1435 | /* There are no instructions with optional arguments; complain. */ |
| 1436 | if (*parsestr != '\0') |
| 1437 | as_bad (_("missing argument")); |
| 1438 | } |
| 1439 | |
| 1440 | \f |
| 1441 | /** Assembler output support. */ |
| 1442 | |
| 1443 | /* Output a normal instruction. */ |
| 1444 | static void |
| 1445 | output_insn (pru_insn_infoS *insn) |
| 1446 | { |
| 1447 | char *f; |
| 1448 | pru_insn_relocS *reloc; |
| 1449 | |
| 1450 | f = frag_more (4); |
| 1451 | /* This allocates enough space for the instruction |
| 1452 | and puts it in the current frag. */ |
| 1453 | md_number_to_chars (f, insn->insn_code, 4); |
| 1454 | /* Emit debug info. */ |
| 1455 | dwarf2_emit_insn (4); |
| 1456 | /* Create any fixups to be acted on later. */ |
| 1457 | for (reloc = insn->insn_reloc; reloc != NULL; reloc = reloc->reloc_next) |
| 1458 | fix_new_exp (frag_now, f - frag_now->fr_literal, 4, |
| 1459 | &reloc->reloc_expression, reloc->reloc_pcrel, |
| 1460 | reloc->reloc_type); |
| 1461 | } |
| 1462 | |
| 1463 | /* Output two LDI instructions from LDI32 macro */ |
| 1464 | static void |
| 1465 | output_insn_ldi32 (pru_insn_infoS *insn) |
| 1466 | { |
| 1467 | char *f; |
| 1468 | pru_insn_relocS *reloc; |
| 1469 | unsigned long insn2; |
| 1470 | |
| 1471 | f = frag_more (8); |
| 1472 | md_number_to_chars (f, insn->insn_code, 4); |
| 1473 | |
| 1474 | insn2 = insn->insn_code; |
| 1475 | SET_INSN_FIELD (IMM16, insn2, insn->ldi32_imm32 >> 16); |
| 1476 | SET_INSN_FIELD (RDSEL, insn2, RSEL_31_16); |
| 1477 | md_number_to_chars (f + 4, insn2, 4); |
| 1478 | |
| 1479 | /* Emit debug info. */ |
| 1480 | dwarf2_emit_insn (8); |
| 1481 | |
| 1482 | /* Create any fixups to be acted on later. */ |
| 1483 | for (reloc = insn->insn_reloc; reloc != NULL; reloc = reloc->reloc_next) |
| 1484 | fix_new_exp (frag_now, f - frag_now->fr_literal, 4, |
| 1485 | &reloc->reloc_expression, reloc->reloc_pcrel, |
| 1486 | reloc->reloc_type); |
| 1487 | } |
| 1488 | |
| 1489 | \f |
| 1490 | /** External interfaces. */ |
| 1491 | |
| 1492 | /* The following functions are called by machine-independent parts of |
| 1493 | the assembler. */ |
| 1494 | int |
| 1495 | md_parse_option (int c, const char *arg ATTRIBUTE_UNUSED) |
| 1496 | { |
| 1497 | switch (c) |
| 1498 | { |
| 1499 | case 'r': |
| 1500 | /* Hidden option for self-test mode. */ |
| 1501 | pru_mode = PRU_MODE_TEST; |
| 1502 | break; |
| 1503 | case OPTION_LINK_RELAX: |
| 1504 | pru_opt.link_relax = TRUE; |
| 1505 | break; |
| 1506 | case OPTION_NO_LINK_RELAX: |
| 1507 | pru_opt.link_relax = FALSE; |
| 1508 | break; |
| 1509 | case OPTION_NO_WARN_REGNAME_LABEL: |
| 1510 | pru_opt.warn_regname_label = FALSE; |
| 1511 | break; |
| 1512 | default: |
| 1513 | return 0; |
| 1514 | break; |
| 1515 | } |
| 1516 | |
| 1517 | return 1; |
| 1518 | } |
| 1519 | |
| 1520 | const char * |
| 1521 | pru_target_format (void) |
| 1522 | { |
| 1523 | return "elf32-pru"; |
| 1524 | } |
| 1525 | |
| 1526 | /* Machine-dependent usage message. */ |
| 1527 | void |
| 1528 | md_show_usage (FILE *stream) |
| 1529 | { |
| 1530 | fprintf (stream, |
| 1531 | _("PRU options:\n" |
| 1532 | " -mlink-relax generate relocations for linker relaxation (default).\n" |
| 1533 | " -mno-link-relax don't generate relocations for linker relaxation.\n" |
| 1534 | )); |
| 1535 | |
| 1536 | } |
| 1537 | |
| 1538 | /* This function is called once, at assembler startup time. |
| 1539 | It should set up all the tables, etc. that the MD part of the |
| 1540 | assembler will need. */ |
| 1541 | void |
| 1542 | md_begin (void) |
| 1543 | { |
| 1544 | int i; |
| 1545 | const char *inserted; |
| 1546 | |
| 1547 | /* Create and fill a hashtable for the PRU opcodes, registers and |
| 1548 | arguments. */ |
| 1549 | pru_opcode_hash = hash_new (); |
| 1550 | pru_reg_hash = hash_new (); |
| 1551 | |
| 1552 | for (i = 0; i < NUMOPCODES; ++i) |
| 1553 | { |
| 1554 | inserted |
| 1555 | = hash_insert (pru_opcode_hash, pru_opcodes[i].name, |
| 1556 | (PTR) & pru_opcodes[i]); |
| 1557 | if (inserted != NULL) |
| 1558 | { |
| 1559 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), |
| 1560 | pru_opcodes[i].name, inserted); |
| 1561 | /* Probably a memory allocation problem? Give up now. */ |
| 1562 | as_fatal (_("Broken assembler. No assembly attempted.")); |
| 1563 | } |
| 1564 | } |
| 1565 | |
| 1566 | for (i = 0; i < pru_num_regs; ++i) |
| 1567 | { |
| 1568 | inserted |
| 1569 | = hash_insert (pru_reg_hash, pru_regs[i].name, |
| 1570 | (PTR) & pru_regs[i]); |
| 1571 | if (inserted != NULL) |
| 1572 | { |
| 1573 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), |
| 1574 | pru_regs[i].name, inserted); |
| 1575 | /* Probably a memory allocation problem? Give up now. */ |
| 1576 | as_fatal (_("Broken assembler. No assembly attempted.")); |
| 1577 | } |
| 1578 | |
| 1579 | } |
| 1580 | |
| 1581 | linkrelax = pru_opt.link_relax; |
| 1582 | /* Initialize the alignment data. */ |
| 1583 | pru_current_align_seg = now_seg; |
| 1584 | pru_last_label = NULL; |
| 1585 | pru_current_align = 0; |
| 1586 | } |
| 1587 | |
| 1588 | |
| 1589 | /* Assembles a single line of PRU assembly language. */ |
| 1590 | void |
| 1591 | md_assemble (char *op_str) |
| 1592 | { |
| 1593 | char *argstr; |
| 1594 | char *op_strdup = NULL; |
| 1595 | pru_insn_infoS thisinsn; |
| 1596 | pru_insn_infoS *insn = &thisinsn; |
| 1597 | |
| 1598 | /* Make sure we are aligned on a 4-byte boundary. */ |
| 1599 | if (pru_current_align < 2) |
| 1600 | pru_align (2, NULL, pru_last_label); |
| 1601 | else if (pru_current_align > 2) |
| 1602 | pru_current_align = 2; |
| 1603 | pru_last_label = NULL; |
| 1604 | |
| 1605 | /* We don't want to clobber to op_str |
| 1606 | because we want to be able to use it in messages. */ |
| 1607 | op_strdup = strdup (op_str); |
| 1608 | insn->insn_tokens[0] = strtok (op_strdup, " "); |
| 1609 | argstr = strtok (NULL, ""); |
| 1610 | |
| 1611 | /* Assemble the opcode. */ |
| 1612 | insn->insn_pru_opcode = pru_opcode_lookup (insn->insn_tokens[0]); |
| 1613 | insn->insn_reloc = NULL; |
| 1614 | |
| 1615 | if (insn->insn_pru_opcode != NULL) |
| 1616 | { |
| 1617 | const char *argsfmt = insn->insn_pru_opcode->args; |
| 1618 | const char **argtk = &insn->insn_tokens[1]; |
| 1619 | const char *argp; |
| 1620 | |
| 1621 | /* Set the opcode for the instruction. */ |
| 1622 | insn->insn_code = insn->insn_pru_opcode->match; |
| 1623 | |
| 1624 | if (pru_mode == PRU_MODE_TEST) |
| 1625 | { |
| 1626 | /* Add the "expected" instruction parameter used for validation. */ |
| 1627 | argsfmt = malloc (strlen (argsfmt) + 3); |
| 1628 | sprintf ((char *)argsfmt, "%s,E", insn->insn_pru_opcode->args); |
| 1629 | } |
| 1630 | pru_parse_args (insn, argstr, argsfmt, |
| 1631 | (char **) &insn->insn_tokens[1]); |
| 1632 | |
| 1633 | for (argp = argsfmt; !had_errors () && *argp && *argtk; ++argp) |
| 1634 | { |
| 1635 | gas_assert (argtk <= &insn->insn_tokens[PRU_MAX_INSN_TOKENS]); |
| 1636 | |
| 1637 | switch (*argp) |
| 1638 | { |
| 1639 | case ',': |
| 1640 | continue; |
| 1641 | |
| 1642 | case 'd': |
| 1643 | pru_assemble_arg_d (insn, *argtk++); |
| 1644 | continue; |
| 1645 | case 'D': |
| 1646 | pru_assemble_arg_D (insn, *argtk++); |
| 1647 | continue; |
| 1648 | case 'R': |
| 1649 | pru_assemble_arg_R (insn, *argtk++); |
| 1650 | continue; |
| 1651 | case 's': |
| 1652 | pru_assemble_arg_s (insn, *argtk++); |
| 1653 | continue; |
| 1654 | case 'S': |
| 1655 | pru_assemble_arg_S (insn, *argtk++); |
| 1656 | continue; |
| 1657 | case 'b': |
| 1658 | pru_assemble_arg_b (insn, *argtk++); |
| 1659 | continue; |
| 1660 | case 'B': |
| 1661 | pru_assemble_arg_B (insn, *argtk++); |
| 1662 | continue; |
| 1663 | case 'i': |
| 1664 | pru_assemble_arg_i (insn, *argtk++); |
| 1665 | continue; |
| 1666 | case 'j': |
| 1667 | pru_assemble_arg_j (insn, *argtk++); |
| 1668 | continue; |
| 1669 | case 'W': |
| 1670 | pru_assemble_arg_W (insn, *argtk++); |
| 1671 | continue; |
| 1672 | case 'o': |
| 1673 | pru_assemble_arg_o (insn, *argtk++); |
| 1674 | continue; |
| 1675 | case 'O': |
| 1676 | pru_assemble_arg_O (insn, *argtk++); |
| 1677 | continue; |
| 1678 | case 'l': |
| 1679 | pru_assemble_arg_l (insn, *argtk++); |
| 1680 | continue; |
| 1681 | case 'n': |
| 1682 | pru_assemble_arg_n (insn, *argtk++); |
| 1683 | continue; |
| 1684 | case 'c': |
| 1685 | pru_assemble_arg_c (insn, *argtk++); |
| 1686 | continue; |
| 1687 | case 'w': |
| 1688 | pru_assemble_arg_w (insn, *argtk++); |
| 1689 | continue; |
| 1690 | case 'x': |
| 1691 | pru_assemble_arg_x (insn, *argtk++); |
| 1692 | continue; |
| 1693 | |
| 1694 | case 'E': |
| 1695 | pru_check_assembly (insn->insn_code, *argtk++); |
| 1696 | default: |
| 1697 | BAD_CASE (*argp); |
| 1698 | } |
| 1699 | } |
| 1700 | |
| 1701 | if (*argp && !had_errors ()) |
| 1702 | as_bad (_("missing argument")); |
| 1703 | |
| 1704 | if (!had_errors ()) |
| 1705 | { |
| 1706 | if (insn->insn_pru_opcode->pinfo & PRU_INSN_LDI32) |
| 1707 | { |
| 1708 | output_insn_ldi32 (insn); |
| 1709 | } |
| 1710 | else |
| 1711 | { |
| 1712 | output_insn (insn); |
| 1713 | } |
| 1714 | } |
| 1715 | |
| 1716 | if (pru_mode == PRU_MODE_TEST) |
| 1717 | free ((char *)argsfmt); |
| 1718 | } |
| 1719 | else |
| 1720 | /* Unrecognised instruction - error. */ |
| 1721 | as_bad (_("unrecognised instruction %s"), insn->insn_tokens[0]); |
| 1722 | |
| 1723 | /* Don't leak memory. */ |
| 1724 | pru_insn_reloc_destroy (insn->insn_reloc); |
| 1725 | free (op_strdup); |
| 1726 | } |
| 1727 | |
| 1728 | /* Round up section size. */ |
| 1729 | valueT |
| 1730 | md_section_align (asection *seg, valueT addr) |
| 1731 | { |
| 1732 | int align = bfd_get_section_alignment (stdoutput, seg); |
| 1733 | return ((addr + (1 << align) - 1) & (-((valueT) 1 << align))); |
| 1734 | } |
| 1735 | |
| 1736 | /* Implement tc_fix_adjustable. */ |
| 1737 | int |
| 1738 | pru_fix_adjustable (fixS *fixp) |
| 1739 | { |
| 1740 | if (fixp->fx_addsy == NULL) |
| 1741 | return 1; |
| 1742 | |
| 1743 | /* Prevent all adjustments to global symbols. */ |
| 1744 | if (OUTPUT_FLAVOR == bfd_target_elf_flavour |
| 1745 | && (S_IS_EXTERNAL (fixp->fx_addsy) || S_IS_WEAK (fixp->fx_addsy))) |
| 1746 | return 0; |
| 1747 | |
| 1748 | if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT |
| 1749 | || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) |
| 1750 | return 0; |
| 1751 | |
| 1752 | /* Preserve relocations against symbols with function type. */ |
| 1753 | if (symbol_get_bfdsym (fixp->fx_addsy)->flags & BSF_FUNCTION) |
| 1754 | return 0; |
| 1755 | |
| 1756 | return 1; |
| 1757 | } |
| 1758 | |
| 1759 | /* The function tc_gen_reloc creates a relocation structure for the |
| 1760 | fixup fixp, and returns a pointer to it. This structure is passed |
| 1761 | to bfd_install_relocation so that it can be written to the object |
| 1762 | file for linking. */ |
| 1763 | arelent * |
| 1764 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp) |
| 1765 | { |
| 1766 | arelent *reloc = XNEW (arelent); |
| 1767 | reloc->sym_ptr_ptr = XNEW (asymbol *); |
| 1768 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); |
| 1769 | |
| 1770 | reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; |
| 1771 | reloc->addend = fixp->fx_offset; /* fixp->fx_addnumber; */ |
| 1772 | |
| 1773 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type); |
| 1774 | if (reloc->howto == NULL) |
| 1775 | { |
| 1776 | as_bad_where (fixp->fx_file, fixp->fx_line, |
| 1777 | _("can't represent relocation type %s"), |
| 1778 | bfd_get_reloc_code_name (fixp->fx_r_type)); |
| 1779 | |
| 1780 | /* Set howto to a garbage value so that we can keep going. */ |
| 1781 | reloc->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_32); |
| 1782 | gas_assert (reloc->howto != NULL); |
| 1783 | } |
| 1784 | return reloc; |
| 1785 | } |
| 1786 | |
| 1787 | long |
| 1788 | md_pcrel_from (fixS *fixP ATTRIBUTE_UNUSED) |
| 1789 | { |
| 1790 | return fixP->fx_where + fixP->fx_frag->fr_address; |
| 1791 | } |
| 1792 | |
| 1793 | /* Called just before the assembler exits. */ |
| 1794 | void |
| 1795 | md_end (void) |
| 1796 | { |
| 1797 | hash_die (pru_opcode_hash); |
| 1798 | hash_die (pru_reg_hash); |
| 1799 | } |
| 1800 | |
| 1801 | symbolS * |
| 1802 | md_undefined_symbol (char *name ATTRIBUTE_UNUSED) |
| 1803 | { |
| 1804 | return NULL; |
| 1805 | } |
| 1806 | |
| 1807 | /* Implement tc_frob_label. */ |
| 1808 | void |
| 1809 | pru_frob_label (symbolS *lab) |
| 1810 | { |
| 1811 | /* Emit dwarf information. */ |
| 1812 | dwarf2_emit_label (lab); |
| 1813 | |
| 1814 | /* Update the label's address with the current output pointer. */ |
| 1815 | symbol_set_frag (lab, frag_now); |
| 1816 | S_SET_VALUE (lab, (valueT) frag_now_fix ()); |
| 1817 | |
| 1818 | /* Record this label for future adjustment after we find out what |
| 1819 | kind of data it references, and the required alignment therewith. */ |
| 1820 | pru_last_label = lab; |
| 1821 | |
| 1822 | if (pru_opt.warn_regname_label && pru_reg_lookup (S_GET_NAME (lab))) |
| 1823 | as_warn (_("Label \"%s\" matches a CPU register name"), S_GET_NAME (lab)); |
| 1824 | } |
| 1825 | |
| 1826 | static inline char * |
| 1827 | skip_space (char *s) |
| 1828 | { |
| 1829 | while (*s == ' ' || *s == '\t') |
| 1830 | ++s; |
| 1831 | return s; |
| 1832 | } |
| 1833 | |
| 1834 | /* Parse special CONS expression: pmem (expression). Idea from AVR. |
| 1835 | |
| 1836 | Used to catch and mark code (program memory) in constant expression |
| 1837 | relocations. Return non-zero for program memory. */ |
| 1838 | |
| 1839 | int |
| 1840 | pru_parse_cons_expression (expressionS *exp, int nbytes) |
| 1841 | { |
| 1842 | int is_pmem = FALSE; |
| 1843 | char *tmp; |
| 1844 | |
| 1845 | tmp = input_line_pointer = skip_space (input_line_pointer); |
| 1846 | |
| 1847 | if (nbytes == 4 || nbytes == 2) |
| 1848 | { |
| 1849 | const char *pmem_str = "%pmem"; |
| 1850 | int len = strlen (pmem_str); |
| 1851 | |
| 1852 | if (strncasecmp (input_line_pointer, pmem_str, len) == 0) |
| 1853 | { |
| 1854 | input_line_pointer = skip_space (input_line_pointer + len); |
| 1855 | |
| 1856 | if (*input_line_pointer == '(') |
| 1857 | { |
| 1858 | input_line_pointer = skip_space (input_line_pointer + 1); |
| 1859 | is_pmem = TRUE; |
| 1860 | expression (exp); |
| 1861 | |
| 1862 | if (*input_line_pointer == ')') |
| 1863 | ++input_line_pointer; |
| 1864 | else |
| 1865 | { |
| 1866 | as_bad (_("`)' required")); |
| 1867 | is_pmem = FALSE; |
| 1868 | } |
| 1869 | |
| 1870 | return is_pmem; |
| 1871 | } |
| 1872 | |
| 1873 | input_line_pointer = tmp; |
| 1874 | } |
| 1875 | } |
| 1876 | |
| 1877 | expression (exp); |
| 1878 | |
| 1879 | return is_pmem; |
| 1880 | } |
| 1881 | |
| 1882 | /* Implement TC_CONS_FIX_NEW. */ |
| 1883 | void |
| 1884 | pru_cons_fix_new (fragS *frag, int where, unsigned int nbytes, |
| 1885 | expressionS *exp, const int is_pmem) |
| 1886 | { |
| 1887 | bfd_reloc_code_real_type r; |
| 1888 | |
| 1889 | switch (nbytes | (!!is_pmem << 8)) |
| 1890 | { |
| 1891 | case 1 | (0 << 8): r = BFD_RELOC_8; break; |
| 1892 | case 2 | (0 << 8): r = BFD_RELOC_16; break; |
| 1893 | case 4 | (0 << 8): r = BFD_RELOC_32; break; |
| 1894 | case 8 | (0 << 8): r = BFD_RELOC_64; break; |
| 1895 | case 2 | (1 << 8): r = BFD_RELOC_PRU_16_PMEM; break; |
| 1896 | case 4 | (1 << 8): r = BFD_RELOC_PRU_32_PMEM; break; |
| 1897 | default: |
| 1898 | as_bad (_("illegal %s relocation size: %d"), |
| 1899 | is_pmem ? "text" : "data", nbytes); |
| 1900 | return; |
| 1901 | } |
| 1902 | |
| 1903 | fix_new_exp (frag, where, (int) nbytes, exp, 0, r); |
| 1904 | } |
| 1905 | |
| 1906 | /* Implement tc_regname_to_dw2regnum, to convert REGNAME to a DWARF-2 |
| 1907 | register number. */ |
| 1908 | int |
| 1909 | pru_regname_to_dw2regnum (char *regname) |
| 1910 | { |
| 1911 | struct pru_reg *r = pru_reg_lookup (regname); |
| 1912 | if (r == NULL) |
| 1913 | return -1; |
| 1914 | return r->index; |
| 1915 | } |
| 1916 | |
| 1917 | /* Implement tc_cfi_frame_initial_instructions, to initialize the DWARF-2 |
| 1918 | unwind information for this procedure. */ |
| 1919 | void |
| 1920 | pru_frame_initial_instructions (void) |
| 1921 | { |
| 1922 | const unsigned fp_regno = 4; |
| 1923 | cfi_add_CFA_def_cfa (fp_regno, 0); |
| 1924 | } |
| 1925 | |
| 1926 | bfd_boolean |
| 1927 | pru_allow_local_subtract (expressionS * left, |
| 1928 | expressionS * right, |
| 1929 | segT section) |
| 1930 | { |
| 1931 | /* If we are not in relaxation mode, subtraction is OK. */ |
| 1932 | if (!linkrelax) |
| 1933 | return TRUE; |
| 1934 | |
| 1935 | /* If the symbols are not in a code section then they are OK. */ |
| 1936 | if ((section->flags & SEC_CODE) == 0) |
| 1937 | return TRUE; |
| 1938 | |
| 1939 | if (left->X_add_symbol == right->X_add_symbol) |
| 1940 | return TRUE; |
| 1941 | |
| 1942 | /* We have to assume that there may be instructions between the |
| 1943 | two symbols and that relaxation may increase the distance between |
| 1944 | them. */ |
| 1945 | return FALSE; |
| 1946 | } |