| 1 | /* tc-cris.c -- Assembler code for the CRIS CPU core. |
| 2 | Copyright 2000, 2001 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by Axis Communications AB, Lund, Sweden. |
| 5 | Originally written for GAS 1.38.1 by Mikael Asker. |
| 6 | Updates, BFDizing, GNUifying and ELF support by Hans-Peter Nilsson. |
| 7 | |
| 8 | This file is part of GAS, the GNU Assembler. |
| 9 | |
| 10 | GAS is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2, or (at your option) |
| 13 | any later version. |
| 14 | |
| 15 | GAS is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with GAS; see the file COPYING. If not, write to the |
| 22 | Free Software Foundation, 59 Temple Place - Suite 330, Boston, |
| 23 | MA 02111-1307, USA. */ |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | #include "as.h" |
| 27 | #include "safe-ctype.h" |
| 28 | #include "subsegs.h" |
| 29 | #include "opcode/cris.h" |
| 30 | #include "dwarf2dbg.h" |
| 31 | |
| 32 | /* Conventions used here: |
| 33 | Generally speaking, pointers to binutils types such as "fragS" and |
| 34 | "expressionS" get parameter and variable names ending in "P", such as |
| 35 | "fragP", to harmonize with the rest of the binutils code. Other |
| 36 | pointers get a "p" suffix, such as "bufp". Any function or type-name |
| 37 | that could clash with a current or future binutils or GAS function get |
| 38 | a "cris_" prefix. */ |
| 39 | |
| 40 | #define SYNTAX_RELAX_REG_PREFIX "no_register_prefix" |
| 41 | #define SYNTAX_ENFORCE_REG_PREFIX "register_prefix" |
| 42 | #define SYNTAX_USER_SYM_LEADING_UNDERSCORE "leading_underscore" |
| 43 | #define SYNTAX_USER_SYM_NO_LEADING_UNDERSCORE "no_leading_underscore" |
| 44 | #define REGISTER_PREFIX_CHAR '$' |
| 45 | |
| 46 | /* Like in ":GOT", ":GOTOFF" etc. Other ports use '@', but that's in |
| 47 | line_separator_chars for CRIS, so we avoid it. */ |
| 48 | #define PIC_SUFFIX_CHAR ':' |
| 49 | |
| 50 | /* This might be CRIS_INSN_NONE if we're assembling a prefix-insn only. |
| 51 | Note that some prefix-insns might be assembled as CRIS_INSN_NORMAL. */ |
| 52 | enum cris_insn_kind |
| 53 | { |
| 54 | CRIS_INSN_NORMAL, CRIS_INSN_NONE, CRIS_INSN_BRANCH |
| 55 | }; |
| 56 | |
| 57 | /* An instruction will have one of these prefixes. |
| 58 | Although the same bit-pattern, we handle BDAP with an immediate |
| 59 | expression (eventually quick or [pc+]) different from when we only have |
| 60 | register expressions. */ |
| 61 | enum prefix_kind |
| 62 | { |
| 63 | PREFIX_NONE, PREFIX_BDAP_IMM, PREFIX_BDAP, PREFIX_BIAP, PREFIX_DIP, |
| 64 | PREFIX_PUSH |
| 65 | }; |
| 66 | |
| 67 | /* The prefix for an instruction. */ |
| 68 | struct cris_prefix |
| 69 | { |
| 70 | enum prefix_kind kind; |
| 71 | int base_reg_number; |
| 72 | unsigned int opcode; |
| 73 | |
| 74 | /* There might be an expression to be evaluated, like I in [rN+I]. */ |
| 75 | expressionS expr; |
| 76 | |
| 77 | /* If there's an expression, we might need a relocation. Here's the |
| 78 | type of what relocation to start relaxaton with. |
| 79 | The relocation is assumed to start immediately after the prefix insn, |
| 80 | so we don't provide an offset. */ |
| 81 | enum bfd_reloc_code_real reloc; |
| 82 | }; |
| 83 | |
| 84 | /* The description of the instruction being assembled. */ |
| 85 | struct cris_instruction |
| 86 | { |
| 87 | /* If CRIS_INSN_NONE, then this insn is of zero length. */ |
| 88 | enum cris_insn_kind insn_type; |
| 89 | |
| 90 | /* If a special register was mentioned, this is its description, else |
| 91 | it is NULL. */ |
| 92 | const struct cris_spec_reg *spec_reg; |
| 93 | |
| 94 | unsigned int opcode; |
| 95 | |
| 96 | /* An insn may have at most one expression; theoretically there could be |
| 97 | another in its prefix (but I don't see how that could happen). */ |
| 98 | expressionS expr; |
| 99 | |
| 100 | /* The expression might need a relocation. Here's one to start |
| 101 | relaxation with. */ |
| 102 | enum bfd_reloc_code_real reloc; |
| 103 | |
| 104 | /* The size in bytes of an immediate expression, or zero if |
| 105 | nonapplicable. */ |
| 106 | int imm_oprnd_size; |
| 107 | }; |
| 108 | |
| 109 | static void cris_process_instruction PARAMS ((char *, |
| 110 | struct cris_instruction *, |
| 111 | struct cris_prefix *)); |
| 112 | static int get_bwd_size_modifier PARAMS ((char **, int *)); |
| 113 | static int get_bw_size_modifier PARAMS ((char **, int *)); |
| 114 | static int get_gen_reg PARAMS ((char **, int *)); |
| 115 | static int get_spec_reg PARAMS ((char **, |
| 116 | const struct cris_spec_reg **)); |
| 117 | static int get_autoinc_prefix_or_indir_op PARAMS ((char **, |
| 118 | struct cris_prefix *, |
| 119 | int *, int *, int *, |
| 120 | expressionS *)); |
| 121 | static int get_3op_or_dip_prefix_op PARAMS ((char **, |
| 122 | struct cris_prefix *)); |
| 123 | static int cris_get_expression PARAMS ((char **, expressionS *)); |
| 124 | static int get_flags PARAMS ((char **, int *)); |
| 125 | static void gen_bdap PARAMS ((int, expressionS *)); |
| 126 | static int branch_disp PARAMS ((int)); |
| 127 | static void gen_cond_branch_32 PARAMS ((char *, char *, fragS *, |
| 128 | symbolS *, symbolS *, long int)); |
| 129 | static void cris_number_to_imm PARAMS ((char *, long, int, fixS *, segT)); |
| 130 | static void cris_create_short_jump PARAMS ((char *, addressT, addressT, |
| 131 | fragS *, symbolS *)); |
| 132 | static void s_syntax PARAMS ((int)); |
| 133 | static void s_cris_file PARAMS ((int)); |
| 134 | static void s_cris_loc PARAMS ((int)); |
| 135 | |
| 136 | /* Get ":GOT", ":GOTOFF", ":PLT" etc. suffixes. */ |
| 137 | static void cris_get_pic_suffix PARAMS ((char **, |
| 138 | bfd_reloc_code_real_type *, |
| 139 | expressionS *)); |
| 140 | static unsigned int cris_get_pic_reloc_size |
| 141 | PARAMS ((bfd_reloc_code_real_type)); |
| 142 | |
| 143 | /* All the .syntax functions. */ |
| 144 | static void cris_force_reg_prefix PARAMS ((void)); |
| 145 | static void cris_relax_reg_prefix PARAMS ((void)); |
| 146 | static void cris_sym_leading_underscore PARAMS ((void)); |
| 147 | static void cris_sym_no_leading_underscore PARAMS ((void)); |
| 148 | static char *cris_insn_first_word_frag PARAMS ((void)); |
| 149 | |
| 150 | /* Handle to the opcode hash table. */ |
| 151 | static struct hash_control *op_hash = NULL; |
| 152 | |
| 153 | /* Whether we demand that registers have a `$' prefix. Default here. */ |
| 154 | static boolean demand_register_prefix = false; |
| 155 | |
| 156 | /* Whether global user symbols have a leading underscore. Default here. */ |
| 157 | static boolean symbols_have_leading_underscore = true; |
| 158 | |
| 159 | /* Whether or not we allow PIC, and expand to PIC-friendly constructs. */ |
| 160 | static boolean pic = false; |
| 161 | |
| 162 | const pseudo_typeS md_pseudo_table[] = |
| 163 | { |
| 164 | {"dword", cons, 4}, |
| 165 | {"syntax", s_syntax, 0}, |
| 166 | {"file", s_cris_file, 0}, |
| 167 | {"loc", s_cris_loc, 0}, |
| 168 | {NULL, 0, 0} |
| 169 | }; |
| 170 | |
| 171 | static int warn_for_branch_expansion = 0; |
| 172 | |
| 173 | const char cris_comment_chars[] = ";"; |
| 174 | |
| 175 | /* This array holds the chars that only start a comment at the beginning of |
| 176 | a line. If the line seems to have the form '# 123 filename' |
| 177 | .line and .file directives will appear in the pre-processed output. */ |
| 178 | /* Note that input_file.c hand-checks for '#' at the beginning of the |
| 179 | first line of the input file. This is because the compiler outputs |
| 180 | #NO_APP at the beginning of its output. */ |
| 181 | /* Also note that slash-star will always start a comment. */ |
| 182 | const char line_comment_chars[] = "#"; |
| 183 | const char line_separator_chars[] = "@"; |
| 184 | |
| 185 | /* Now all floating point support is shut off. See md_atof. */ |
| 186 | const char EXP_CHARS[] = ""; |
| 187 | const char FLT_CHARS[] = ""; |
| 188 | |
| 189 | /* For CRIS, we encode the relax_substateTs (in e.g. fr_substate) as: |
| 190 | 2 1 0 |
| 191 | ---/ /--+-----------------+-----------------+-----------------+ |
| 192 | | what state ? | how long ? | |
| 193 | ---/ /--+-----------------+-----------------+-----------------+ |
| 194 | |
| 195 | The "how long" bits are 00 = byte, 01 = word, 10 = dword (long). |
| 196 | This is a Un*x convention. |
| 197 | Not all lengths are legit for a given value of (what state). |
| 198 | |
| 199 | Groups for CRIS address relaxing: |
| 200 | |
| 201 | 1. Bcc |
| 202 | length: byte, word, 10-byte expansion |
| 203 | |
| 204 | 2. BDAP |
| 205 | length: byte, word, dword */ |
| 206 | |
| 207 | #define STATE_CONDITIONAL_BRANCH (1) |
| 208 | #define STATE_BASE_PLUS_DISP_PREFIX (2) |
| 209 | |
| 210 | #define STATE_LENGTH_MASK (3) |
| 211 | #define STATE_BYTE (0) |
| 212 | #define STATE_WORD (1) |
| 213 | #define STATE_DWORD (2) |
| 214 | /* Symbol undefined. */ |
| 215 | #define STATE_UNDF (3) |
| 216 | #define STATE_MAX_LENGTH (3) |
| 217 | |
| 218 | /* These displacements are relative to the adress following the opcode |
| 219 | word of the instruction. The first letter is Byte, Word. The 2nd |
| 220 | letter is Forward, Backward. */ |
| 221 | |
| 222 | #define BRANCH_BF ( 254) |
| 223 | #define BRANCH_BB (-256) |
| 224 | #define BRANCH_WF (2 + 32767) |
| 225 | #define BRANCH_WB (2 + -32768) |
| 226 | |
| 227 | #define BDAP_BF ( 127) |
| 228 | #define BDAP_BB (-128) |
| 229 | #define BDAP_WF ( 32767) |
| 230 | #define BDAP_WB (-32768) |
| 231 | |
| 232 | #define ENCODE_RELAX(what, length) (((what) << 2) + (length)) |
| 233 | |
| 234 | const relax_typeS md_cris_relax_table[] = |
| 235 | { |
| 236 | /* Error sentinel (0, 0). */ |
| 237 | {1, 1, 0, 0}, |
| 238 | |
| 239 | /* Unused (0, 1). */ |
| 240 | {1, 1, 0, 0}, |
| 241 | |
| 242 | /* Unused (0, 2). */ |
| 243 | {1, 1, 0, 0}, |
| 244 | |
| 245 | /* Unused (0, 3). */ |
| 246 | {1, 1, 0, 0}, |
| 247 | |
| 248 | /* Bcc o (1, 0). */ |
| 249 | {BRANCH_BF, BRANCH_BB, 0, ENCODE_RELAX (1, 1)}, |
| 250 | |
| 251 | /* Bcc [PC+] (1, 1). */ |
| 252 | {BRANCH_WF, BRANCH_WB, 2, ENCODE_RELAX (1, 2)}, |
| 253 | |
| 254 | /* BEXT/BWF, BA, JUMP (external), JUMP (always), Bnot_cc, JUMP (default) |
| 255 | (1, 2). */ |
| 256 | {0, 0, 10, 0}, |
| 257 | |
| 258 | /* Unused (1, 3). */ |
| 259 | {1, 1, 0, 0}, |
| 260 | |
| 261 | /* BDAP o (2, 0). */ |
| 262 | {BDAP_BF, BDAP_BB, 0, ENCODE_RELAX (2, 1)}, |
| 263 | |
| 264 | /* BDAP.[bw] [PC+] (2, 1). */ |
| 265 | {BDAP_WF, BDAP_WB, 2, ENCODE_RELAX (2, 2)}, |
| 266 | |
| 267 | /* BDAP.d [PC+] (2, 2). */ |
| 268 | {0, 0, 4, 0} |
| 269 | }; |
| 270 | |
| 271 | #undef BRANCH_BF |
| 272 | #undef BRANCH_BB |
| 273 | #undef BRANCH_WF |
| 274 | #undef BRANCH_WB |
| 275 | #undef BDAP_BF |
| 276 | #undef BDAP_BB |
| 277 | #undef BDAP_WF |
| 278 | #undef BDAP_WB |
| 279 | |
| 280 | /* Target-specific multicharacter options, not const-declared at usage |
| 281 | in 2.9.1 and CVS of 2000-02-16. */ |
| 282 | struct option md_longopts[] = |
| 283 | { |
| 284 | #define OPTION_NO_US (OPTION_MD_BASE + 0) |
| 285 | {"no-underscore", no_argument, NULL, OPTION_NO_US}, |
| 286 | #define OPTION_US (OPTION_MD_BASE + 1) |
| 287 | {"underscore", no_argument, NULL, OPTION_US}, |
| 288 | #define OPTION_PIC (OPTION_MD_BASE + 2) |
| 289 | {"pic", no_argument, NULL, OPTION_PIC}, |
| 290 | {NULL, no_argument, NULL, 0} |
| 291 | }; |
| 292 | |
| 293 | /* Not const-declared at usage in 2.9.1. */ |
| 294 | size_t md_longopts_size = sizeof (md_longopts); |
| 295 | const char *md_shortopts = "hHN"; |
| 296 | |
| 297 | /* At first glance, this may seems wrong and should be 4 (ba + nop); but |
| 298 | since a short_jump must skip a *number* of long jumps, it must also be |
| 299 | a long jump. Here, we hope to make it a "ba [16bit_offs]" and a "nop" |
| 300 | for the delay slot and hope that the jump table at most needs |
| 301 | 32767/4=8191 long-jumps. A branch is better than a jump, since it is |
| 302 | relative; we will not have a reloc to fix up somewhere. |
| 303 | |
| 304 | Note that we can't add relocs, because relaxation uses these fixed |
| 305 | numbers, and md_create_short_jump is called after relaxation. */ |
| 306 | |
| 307 | const int md_short_jump_size = 6; |
| 308 | const int md_long_jump_size = 6; |
| 309 | |
| 310 | /* Report output format. Small changes in output format (like elf |
| 311 | variants below) can happen until all options are parsed, but after |
| 312 | that, the output format must remain fixed. */ |
| 313 | |
| 314 | const char * |
| 315 | cris_target_format () |
| 316 | { |
| 317 | switch (OUTPUT_FLAVOR) |
| 318 | { |
| 319 | case bfd_target_aout_flavour: |
| 320 | return "a.out-cris"; |
| 321 | |
| 322 | case bfd_target_elf_flavour: |
| 323 | if (symbols_have_leading_underscore) |
| 324 | return "elf32-us-cris"; |
| 325 | return "elf32-cris"; |
| 326 | |
| 327 | default: |
| 328 | abort (); |
| 329 | return NULL; |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | /* Prepare machine-dependent frags for relaxation. |
| 334 | |
| 335 | Called just before relaxation starts. Any symbol that is now undefined |
| 336 | will not become defined. |
| 337 | |
| 338 | Return the correct fr_subtype in the frag. |
| 339 | |
| 340 | Return the initial "guess for fr_var" to caller. The guess for fr_var |
| 341 | is *actually* the growth beyond fr_fix. Whatever we do to grow fr_fix |
| 342 | or fr_var contributes to our returned value. |
| 343 | |
| 344 | Although it may not be explicit in the frag, pretend |
| 345 | fr_var starts with a value. */ |
| 346 | |
| 347 | int |
| 348 | md_estimate_size_before_relax (fragP, segment_type) |
| 349 | fragS *fragP; |
| 350 | /* The segment is either N_DATA or N_TEXT. */ |
| 351 | segT segment_type; |
| 352 | { |
| 353 | int old_fr_fix; |
| 354 | |
| 355 | old_fr_fix = fragP->fr_fix; |
| 356 | |
| 357 | switch (fragP->fr_subtype) |
| 358 | { |
| 359 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_UNDF): |
| 360 | if (S_GET_SEGMENT (fragP->fr_symbol) == segment_type) |
| 361 | /* The symbol lies in the same segment - a relaxable case. */ |
| 362 | fragP->fr_subtype |
| 363 | = ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE); |
| 364 | else |
| 365 | /* Unknown or not the same segment, so not relaxable. */ |
| 366 | fragP->fr_subtype |
| 367 | = ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_DWORD); |
| 368 | fragP->fr_var = md_cris_relax_table[fragP->fr_subtype].rlx_length; |
| 369 | break; |
| 370 | |
| 371 | case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_UNDF): |
| 372 | /* Note that we can not do anything sane with relaxing |
| 373 | [rX + a_known_symbol_in_text], it will have to be a 32-bit |
| 374 | value. |
| 375 | |
| 376 | We could play tricks with managing a constant pool and make |
| 377 | a_known_symbol_in_text a "bdap [pc + offset]" pointing there |
| 378 | (like the GOT for ELF shared libraries), but that's no use, it |
| 379 | would in general be no shorter or faster code, only more |
| 380 | complicated. */ |
| 381 | |
| 382 | if (S_GET_SEGMENT (fragP->fr_symbol) != absolute_section) |
| 383 | { |
| 384 | /* Go for dword if not absolute or same segment. */ |
| 385 | fragP->fr_subtype |
| 386 | = ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_DWORD); |
| 387 | fragP->fr_var = md_cris_relax_table[fragP->fr_subtype].rlx_length; |
| 388 | } |
| 389 | else |
| 390 | { |
| 391 | /* Absolute expression. */ |
| 392 | long int value; |
| 393 | value = S_GET_VALUE (fragP->fr_symbol) + fragP->fr_offset; |
| 394 | |
| 395 | if (value >= -128 && value <= 127) |
| 396 | { |
| 397 | /* Byte displacement. */ |
| 398 | (fragP->fr_opcode)[0] = value; |
| 399 | } |
| 400 | else |
| 401 | { |
| 402 | /* Word or dword displacement. */ |
| 403 | int pow2_of_size = 1; |
| 404 | char *writep; |
| 405 | |
| 406 | if (value < -32768 || value > 32767) |
| 407 | { |
| 408 | /* Outside word range, make it a dword. */ |
| 409 | pow2_of_size = 2; |
| 410 | } |
| 411 | |
| 412 | /* Modify the byte-offset BDAP into a word or dword offset |
| 413 | BDAP. Or really, a BDAP rX,8bit into a |
| 414 | BDAP.[wd] rX,[PC+] followed by a word or dword. */ |
| 415 | (fragP->fr_opcode)[0] = BDAP_PC_LOW + pow2_of_size * 16; |
| 416 | |
| 417 | /* Keep the register number in the highest four bits. */ |
| 418 | (fragP->fr_opcode)[1] &= 0xF0; |
| 419 | (fragP->fr_opcode)[1] |= BDAP_INCR_HIGH; |
| 420 | |
| 421 | /* It grew by two or four bytes. */ |
| 422 | fragP->fr_fix += 1 << pow2_of_size; |
| 423 | writep = fragP->fr_literal + old_fr_fix; |
| 424 | md_number_to_chars (writep, value, 1 << pow2_of_size); |
| 425 | } |
| 426 | frag_wane (fragP); |
| 427 | } |
| 428 | break; |
| 429 | |
| 430 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE): |
| 431 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_WORD): |
| 432 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_DWORD): |
| 433 | case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_BYTE): |
| 434 | case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_WORD): |
| 435 | case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_DWORD): |
| 436 | /* When relaxing a section for the second time, we don't need to |
| 437 | do anything except making sure that fr_var is set right. */ |
| 438 | fragP->fr_var = md_cris_relax_table[fragP->fr_subtype].rlx_length; |
| 439 | break; |
| 440 | |
| 441 | default: |
| 442 | BAD_CASE (fragP->fr_subtype); |
| 443 | } |
| 444 | |
| 445 | return fragP->fr_var + (fragP->fr_fix - old_fr_fix); |
| 446 | } |
| 447 | |
| 448 | /* Perform post-processing of machine-dependent frags after relaxation. |
| 449 | Called after relaxation is finished. |
| 450 | In: Address of frag. |
| 451 | fr_type == rs_machine_dependent. |
| 452 | fr_subtype is what the address relaxed to. |
| 453 | |
| 454 | Out: Any fixS:s and constants are set up. |
| 455 | |
| 456 | The caller will turn the frag into a ".space 0". */ |
| 457 | |
| 458 | void |
| 459 | md_convert_frag (abfd, sec, fragP) |
| 460 | bfd *abfd ATTRIBUTE_UNUSED; |
| 461 | segT sec ATTRIBUTE_UNUSED; |
| 462 | fragS *fragP; |
| 463 | { |
| 464 | /* Pointer to first byte in variable-sized part of the frag. */ |
| 465 | char *var_partp; |
| 466 | |
| 467 | /* Pointer to first opcode byte in frag. */ |
| 468 | char *opcodep; |
| 469 | |
| 470 | /* Used to check integrity of the relaxation. |
| 471 | One of 2 = long, 1 = word, or 0 = byte. */ |
| 472 | int length_code; |
| 473 | |
| 474 | /* Size in bytes of variable-sized part of frag. */ |
| 475 | int var_part_size = 0; |
| 476 | |
| 477 | /* This is part of *fragP. It contains all information about addresses |
| 478 | and offsets to varying parts. */ |
| 479 | symbolS *symbolP; |
| 480 | unsigned long var_part_offset; |
| 481 | |
| 482 | /* Where, in file space, is _var of *fragP? */ |
| 483 | unsigned long address_of_var_part = 0; |
| 484 | |
| 485 | /* Where, in file space, does addr point? */ |
| 486 | unsigned long target_address; |
| 487 | |
| 488 | know (fragP->fr_type == rs_machine_dependent); |
| 489 | |
| 490 | length_code = fragP->fr_subtype & STATE_LENGTH_MASK; |
| 491 | know (length_code >= 0 && length_code < STATE_MAX_LENGTH); |
| 492 | |
| 493 | var_part_offset = fragP->fr_fix; |
| 494 | var_partp = fragP->fr_literal + var_part_offset; |
| 495 | opcodep = fragP->fr_opcode; |
| 496 | |
| 497 | symbolP = fragP->fr_symbol; |
| 498 | target_address = (symbolP ? S_GET_VALUE (symbolP) : 0) + fragP->fr_offset; |
| 499 | address_of_var_part = fragP->fr_address + var_part_offset; |
| 500 | |
| 501 | switch (fragP->fr_subtype) |
| 502 | { |
| 503 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE): |
| 504 | opcodep[0] = branch_disp ((target_address - address_of_var_part)); |
| 505 | var_part_size = 0; |
| 506 | break; |
| 507 | |
| 508 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_WORD): |
| 509 | /* We had a quick immediate branch, now turn it into a word one i.e. a |
| 510 | PC autoincrement. */ |
| 511 | opcodep[0] = BRANCH_PC_LOW; |
| 512 | opcodep[1] &= 0xF0; |
| 513 | opcodep[1] |= BRANCH_INCR_HIGH; |
| 514 | md_number_to_chars (var_partp, |
| 515 | (long) (target_address - (address_of_var_part + 2)), |
| 516 | 2); |
| 517 | var_part_size = 2; |
| 518 | break; |
| 519 | |
| 520 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_DWORD): |
| 521 | gen_cond_branch_32 (fragP->fr_opcode, var_partp, fragP, |
| 522 | fragP->fr_symbol, (symbolS *) NULL, |
| 523 | fragP->fr_offset); |
| 524 | /* Ten bytes added: a branch, nop and a jump. */ |
| 525 | var_part_size = 2 + 2 + 4 + 2; |
| 526 | break; |
| 527 | |
| 528 | case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_BYTE): |
| 529 | var_partp[0] = target_address - (address_of_var_part + 1); |
| 530 | var_part_size = 0; |
| 531 | break; |
| 532 | |
| 533 | case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_WORD): |
| 534 | /* We had a BDAP 8-bit "quick immediate", now turn it into a 16-bit |
| 535 | one that uses PC autoincrement. */ |
| 536 | opcodep[0] = BDAP_PC_LOW + (1 << 4); |
| 537 | opcodep[1] &= 0xF0; |
| 538 | opcodep[1] |= BDAP_INCR_HIGH; |
| 539 | md_number_to_chars (var_partp, (long) (target_address), 2); |
| 540 | var_part_size = 2; |
| 541 | break; |
| 542 | |
| 543 | case ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_DWORD): |
| 544 | /* We had a BDAP 16-bit "word", change the offset to a dword. */ |
| 545 | opcodep[0] = BDAP_PC_LOW + (2 << 4); |
| 546 | opcodep[1] &= 0xF0; |
| 547 | opcodep[1] |= BDAP_INCR_HIGH; |
| 548 | if (fragP->fr_symbol == NULL) |
| 549 | md_number_to_chars (var_partp, fragP->fr_offset, 4); |
| 550 | else |
| 551 | fix_new (fragP, var_partp - fragP->fr_literal, 4, fragP->fr_symbol, |
| 552 | fragP->fr_offset, 0, BFD_RELOC_32); |
| 553 | var_part_size = 4; |
| 554 | break; |
| 555 | |
| 556 | default: |
| 557 | BAD_CASE (fragP->fr_subtype); |
| 558 | break; |
| 559 | } |
| 560 | |
| 561 | fragP->fr_fix += var_part_size; |
| 562 | } |
| 563 | |
| 564 | /* Generate a short jump around a secondary jump table. |
| 565 | Used by md_create_long_jump. |
| 566 | |
| 567 | This used to be md_create_short_jump, but is now called from |
| 568 | md_create_long_jump instead, when sufficient. |
| 569 | since the sizes of the jumps are the same. It used to be brittle, |
| 570 | making possibilities for creating bad code. */ |
| 571 | |
| 572 | static void |
| 573 | cris_create_short_jump (storep, from_addr, to_addr, fragP, to_symbol) |
| 574 | char *storep; |
| 575 | addressT from_addr; |
| 576 | addressT to_addr; |
| 577 | fragS *fragP ATTRIBUTE_UNUSED; |
| 578 | symbolS *to_symbol ATTRIBUTE_UNUSED; |
| 579 | { |
| 580 | long int distance; |
| 581 | |
| 582 | distance = to_addr - from_addr; |
| 583 | |
| 584 | if (-254 <= distance && distance <= 256) |
| 585 | { |
| 586 | /* Create a "short" short jump: "BA distance - 2". */ |
| 587 | storep[0] = branch_disp (distance - 2); |
| 588 | storep[1] = BA_QUICK_HIGH; |
| 589 | |
| 590 | /* A nop for the delay slot. */ |
| 591 | md_number_to_chars (storep + 2, NOP_OPCODE, 2); |
| 592 | |
| 593 | /* The extra word should be filled with something sane too. Make it |
| 594 | a nop to keep disassembly sane. */ |
| 595 | md_number_to_chars (storep + 4, NOP_OPCODE, 2); |
| 596 | } |
| 597 | else |
| 598 | { |
| 599 | /* Make it a "long" short jump: "BA (PC+)". */ |
| 600 | md_number_to_chars (storep, BA_PC_INCR_OPCODE, 2); |
| 601 | |
| 602 | /* ".WORD distance - 4". */ |
| 603 | md_number_to_chars (storep + 2, (long) (distance - 4), 2); |
| 604 | |
| 605 | /* A nop for the delay slot. */ |
| 606 | md_number_to_chars (storep + 4, NOP_OPCODE, 2); |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | /* Generate a long jump in a secondary jump table. |
| 611 | |
| 612 | storep Where to store the jump instruction. |
| 613 | from_addr Address of the jump instruction. |
| 614 | to_addr Destination address of the jump. |
| 615 | fragP Which frag the destination address operand |
| 616 | lies in. |
| 617 | to_symbol Destination symbol. */ |
| 618 | |
| 619 | void |
| 620 | md_create_long_jump (storep, from_addr, to_addr, fragP, to_symbol) |
| 621 | char *storep; |
| 622 | addressT from_addr; |
| 623 | addressT to_addr; |
| 624 | fragS *fragP; |
| 625 | symbolS *to_symbol; |
| 626 | { |
| 627 | long int distance; |
| 628 | |
| 629 | distance = to_addr - from_addr; |
| 630 | |
| 631 | if (-32763 <= distance && distance <= 32772) |
| 632 | { |
| 633 | /* Then make it a "short" long jump. */ |
| 634 | cris_create_short_jump (storep, from_addr, to_addr, fragP, |
| 635 | to_symbol); |
| 636 | } |
| 637 | else |
| 638 | { |
| 639 | /* We have a "long" long jump: "JUMP [PC+]". |
| 640 | Make it an "ADD [PC+],PC" if we're supposed to emit PIC code. */ |
| 641 | md_number_to_chars (storep, |
| 642 | pic ? ADD_PC_INCR_OPCODE : JUMP_PC_INCR_OPCODE, 2); |
| 643 | |
| 644 | /* Follow with a ".DWORD to_addr", PC-relative for PIC. */ |
| 645 | fix_new (fragP, storep + 2 - fragP->fr_literal, 4, to_symbol, |
| 646 | 0, pic ? 1 : 0, pic ? BFD_RELOC_32_PCREL : BFD_RELOC_32); |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | /* Allocate space for the first piece of an insn, and mark it as the |
| 651 | start of the insn for debug-format use. */ |
| 652 | |
| 653 | static char * |
| 654 | cris_insn_first_word_frag () |
| 655 | { |
| 656 | char *insnp = frag_more (2); |
| 657 | |
| 658 | /* We need to mark the start of the insn by passing dwarf2_emit_insn |
| 659 | the offset from the current fragment position. This must be done |
| 660 | after the first fragment is created but before any other fragments |
| 661 | (fixed or varying) are created. Note that the offset only |
| 662 | corresponds to the "size" of the insn for a fixed-size, |
| 663 | non-expanded insn. */ |
| 664 | if (OUTPUT_FLAVOR == bfd_target_elf_flavour) |
| 665 | dwarf2_emit_insn (2); |
| 666 | |
| 667 | return insnp; |
| 668 | } |
| 669 | |
| 670 | /* Port-specific assembler initialization. */ |
| 671 | |
| 672 | void |
| 673 | md_begin () |
| 674 | { |
| 675 | const char *hashret = NULL; |
| 676 | int i = 0; |
| 677 | |
| 678 | /* Set up a hash table for the instructions. */ |
| 679 | op_hash = hash_new (); |
| 680 | if (op_hash == NULL) |
| 681 | as_fatal (_("Virtual memory exhausted")); |
| 682 | |
| 683 | while (cris_opcodes[i].name != NULL) |
| 684 | { |
| 685 | const char *name = cris_opcodes[i].name; |
| 686 | hashret = hash_insert (op_hash, name, (PTR) &cris_opcodes[i]); |
| 687 | |
| 688 | if (hashret != NULL && *hashret != '\0') |
| 689 | as_fatal (_("Can't hash `%s': %s\n"), cris_opcodes[i].name, |
| 690 | *hashret == 0 ? _("(unknown reason)") : hashret); |
| 691 | do |
| 692 | { |
| 693 | if (cris_opcodes[i].match & cris_opcodes[i].lose) |
| 694 | as_fatal (_("Buggy opcode: `%s' \"%s\"\n"), cris_opcodes[i].name, |
| 695 | cris_opcodes[i].args); |
| 696 | |
| 697 | ++i; |
| 698 | } |
| 699 | while (cris_opcodes[i].name != NULL |
| 700 | && strcmp (cris_opcodes[i].name, name) == 0); |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | /* Assemble a source line. */ |
| 705 | |
| 706 | void |
| 707 | md_assemble (str) |
| 708 | char *str; |
| 709 | { |
| 710 | struct cris_instruction output_instruction; |
| 711 | struct cris_prefix prefix; |
| 712 | char *opcodep; |
| 713 | char *p; |
| 714 | |
| 715 | know (str); |
| 716 | |
| 717 | /* Do the low-level grunt - assemble to bits and split up into a prefix |
| 718 | and ordinary insn. */ |
| 719 | cris_process_instruction (str, &output_instruction, &prefix); |
| 720 | |
| 721 | /* Handle any prefixes to the instruction. */ |
| 722 | switch (prefix.kind) |
| 723 | { |
| 724 | case PREFIX_NONE: |
| 725 | break; |
| 726 | |
| 727 | /* When the expression is unknown for a BDAP, it can need 0, 2 or 4 |
| 728 | extra bytes, so we handle it separately. */ |
| 729 | case PREFIX_BDAP_IMM: |
| 730 | /* We only do it if the relocation is unspecified, i.e. not a PIC |
| 731 | relocation. */ |
| 732 | if (prefix.reloc == BFD_RELOC_NONE) |
| 733 | { |
| 734 | gen_bdap (prefix.base_reg_number, &prefix.expr); |
| 735 | break; |
| 736 | } |
| 737 | /* Fall through. */ |
| 738 | case PREFIX_BDAP: |
| 739 | case PREFIX_BIAP: |
| 740 | case PREFIX_DIP: |
| 741 | opcodep = cris_insn_first_word_frag (); |
| 742 | |
| 743 | /* Output the prefix opcode. */ |
| 744 | md_number_to_chars (opcodep, (long) prefix.opcode, 2); |
| 745 | |
| 746 | /* Having a specified reloc only happens for DIP and for BDAP with |
| 747 | PIC operands, but it is ok to drop through here for the other |
| 748 | prefixes as they can have no relocs specified. */ |
| 749 | if (prefix.reloc != BFD_RELOC_NONE) |
| 750 | { |
| 751 | unsigned int relocsize |
| 752 | = (prefix.kind == PREFIX_DIP |
| 753 | ? 4 : cris_get_pic_reloc_size (prefix.reloc)); |
| 754 | |
| 755 | p = frag_more (relocsize); |
| 756 | fix_new_exp (frag_now, (p - frag_now->fr_literal), relocsize, |
| 757 | &prefix.expr, 0, prefix.reloc); |
| 758 | } |
| 759 | break; |
| 760 | |
| 761 | case PREFIX_PUSH: |
| 762 | opcodep = cris_insn_first_word_frag (); |
| 763 | |
| 764 | /* Output the prefix opcode. Being a "push", we add the negative |
| 765 | size of the register to "sp". */ |
| 766 | if (output_instruction.spec_reg != NULL) |
| 767 | { |
| 768 | /* Special register. */ |
| 769 | opcodep[0] = -output_instruction.spec_reg->reg_size; |
| 770 | } |
| 771 | else |
| 772 | { |
| 773 | /* General register. */ |
| 774 | opcodep[0] = -4; |
| 775 | } |
| 776 | opcodep[1] = (REG_SP << 4) + (BDAP_QUICK_OPCODE >> 8); |
| 777 | break; |
| 778 | |
| 779 | default: |
| 780 | BAD_CASE (prefix.kind); |
| 781 | } |
| 782 | |
| 783 | /* If we only had a prefix insn, we're done. */ |
| 784 | if (output_instruction.insn_type == CRIS_INSN_NONE) |
| 785 | return; |
| 786 | |
| 787 | /* Done with the prefix. Continue with the main instruction. */ |
| 788 | if (prefix.kind == PREFIX_NONE) |
| 789 | opcodep = cris_insn_first_word_frag (); |
| 790 | else |
| 791 | opcodep = frag_more (2); |
| 792 | |
| 793 | /* Output the instruction opcode. */ |
| 794 | md_number_to_chars (opcodep, (long) (output_instruction.opcode), 2); |
| 795 | |
| 796 | /* Output the symbol-dependent instruction stuff. */ |
| 797 | if (output_instruction.insn_type == CRIS_INSN_BRANCH) |
| 798 | { |
| 799 | segT to_seg = absolute_section; |
| 800 | int is_undefined = 0; |
| 801 | int length_code; |
| 802 | |
| 803 | if (output_instruction.expr.X_op != O_constant) |
| 804 | { |
| 805 | to_seg = S_GET_SEGMENT (output_instruction.expr.X_add_symbol); |
| 806 | |
| 807 | if (to_seg == undefined_section) |
| 808 | is_undefined = 1; |
| 809 | } |
| 810 | |
| 811 | if (output_instruction.expr.X_op == O_constant |
| 812 | || to_seg == now_seg || is_undefined) |
| 813 | { |
| 814 | /* Handle complex expressions. */ |
| 815 | valueT addvalue |
| 816 | = (output_instruction.expr.X_op_symbol != NULL |
| 817 | ? 0 : output_instruction.expr.X_add_number); |
| 818 | symbolS *sym |
| 819 | = (output_instruction.expr.X_op_symbol != NULL |
| 820 | ? make_expr_symbol (&output_instruction.expr) |
| 821 | : output_instruction.expr.X_add_symbol); |
| 822 | |
| 823 | /* If is_undefined, then the expression may BECOME now_seg. */ |
| 824 | length_code = is_undefined ? STATE_UNDF : STATE_BYTE; |
| 825 | |
| 826 | /* Make room for max ten bytes of variable length. */ |
| 827 | frag_var (rs_machine_dependent, 10, 0, |
| 828 | ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, length_code), |
| 829 | sym, addvalue, opcodep); |
| 830 | } |
| 831 | else |
| 832 | { |
| 833 | /* We have: to_seg != now_seg && to_seg != undefined_section. |
| 834 | This means it is a branch to a known symbol in another |
| 835 | section. Code in data? Weird but valid. Emit a 32-bit |
| 836 | branch. */ |
| 837 | char *cond_jump = frag_more (10); |
| 838 | |
| 839 | gen_cond_branch_32 (opcodep, cond_jump, frag_now, |
| 840 | output_instruction.expr.X_add_symbol, |
| 841 | (symbolS *) NULL, |
| 842 | output_instruction.expr.X_add_number); |
| 843 | } |
| 844 | } |
| 845 | else |
| 846 | { |
| 847 | if (output_instruction.imm_oprnd_size > 0) |
| 848 | { |
| 849 | /* The intruction has an immediate operand. */ |
| 850 | enum bfd_reloc_code_real reloc = BFD_RELOC_NONE; |
| 851 | |
| 852 | switch (output_instruction.imm_oprnd_size) |
| 853 | { |
| 854 | /* Any byte-size immediate constants are treated as |
| 855 | word-size. FIXME: Thus overflow check does not work |
| 856 | correctly. */ |
| 857 | |
| 858 | case 2: |
| 859 | /* Note that size-check for the explicit reloc has already |
| 860 | been done when we get here. */ |
| 861 | if (output_instruction.reloc != BFD_RELOC_NONE) |
| 862 | reloc = output_instruction.reloc; |
| 863 | else |
| 864 | reloc = BFD_RELOC_16; |
| 865 | break; |
| 866 | |
| 867 | case 4: |
| 868 | /* Allow a relocation specified in the operand. */ |
| 869 | if (output_instruction.reloc != BFD_RELOC_NONE) |
| 870 | reloc = output_instruction.reloc; |
| 871 | else |
| 872 | reloc = BFD_RELOC_32; |
| 873 | break; |
| 874 | |
| 875 | default: |
| 876 | BAD_CASE (output_instruction.imm_oprnd_size); |
| 877 | } |
| 878 | |
| 879 | p = frag_more (output_instruction.imm_oprnd_size); |
| 880 | fix_new_exp (frag_now, (p - frag_now->fr_literal), |
| 881 | output_instruction.imm_oprnd_size, |
| 882 | &output_instruction.expr, 0, reloc); |
| 883 | } |
| 884 | else if (output_instruction.reloc != BFD_RELOC_NONE) |
| 885 | { |
| 886 | /* An immediate operand that has a relocation and needs to be |
| 887 | processed further. */ |
| 888 | |
| 889 | /* It is important to use fix_new_exp here and everywhere else |
| 890 | (and not fix_new), as fix_new_exp can handle "difference |
| 891 | expressions" - where the expression contains a difference of |
| 892 | two symbols in the same segment. */ |
| 893 | fix_new_exp (frag_now, (opcodep - frag_now->fr_literal), 2, |
| 894 | &output_instruction.expr, 0, |
| 895 | output_instruction.reloc); |
| 896 | } |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | /* Low level text-to-bits assembly. */ |
| 901 | |
| 902 | static void |
| 903 | cris_process_instruction (insn_text, out_insnp, prefixp) |
| 904 | char *insn_text; |
| 905 | struct cris_instruction *out_insnp; |
| 906 | struct cris_prefix *prefixp; |
| 907 | { |
| 908 | char *s; |
| 909 | char modified_char = 0; |
| 910 | const char *args; |
| 911 | struct cris_opcode *instruction; |
| 912 | char *operands; |
| 913 | int match = 0; |
| 914 | int mode; |
| 915 | int regno; |
| 916 | int size_bits; |
| 917 | |
| 918 | /* Reset these fields to a harmless state in case we need to return in |
| 919 | error. */ |
| 920 | prefixp->kind = PREFIX_NONE; |
| 921 | prefixp->reloc = BFD_RELOC_NONE; |
| 922 | out_insnp->insn_type = CRIS_INSN_NORMAL; |
| 923 | out_insnp->imm_oprnd_size = 0; |
| 924 | |
| 925 | /* Find the end of the opcode mnemonic. We assume (true in 2.9.1) |
| 926 | that the caller has translated the opcode to lower-case, up to the |
| 927 | first non-letter. */ |
| 928 | for (operands = insn_text; ISLOWER (*operands); ++operands) |
| 929 | ; |
| 930 | |
| 931 | /* Terminate the opcode after letters, but save the character there if |
| 932 | it was of significance. */ |
| 933 | switch (*operands) |
| 934 | { |
| 935 | case '\0': |
| 936 | break; |
| 937 | |
| 938 | case '.': |
| 939 | /* Put back the modified character later. */ |
| 940 | modified_char = *operands; |
| 941 | /* Fall through. */ |
| 942 | |
| 943 | case ' ': |
| 944 | /* Consume the character after the mnemonic |
| 945 | and replace it with '\0'. */ |
| 946 | *operands++ = '\0'; |
| 947 | break; |
| 948 | |
| 949 | default: |
| 950 | as_bad (_("Unknown opcode: `%s'"), insn_text); |
| 951 | return; |
| 952 | } |
| 953 | |
| 954 | /* Find the instruction. */ |
| 955 | instruction = (struct cris_opcode *) hash_find (op_hash, insn_text); |
| 956 | if (instruction == NULL) |
| 957 | { |
| 958 | as_bad (_("Unknown opcode: `%s'"), insn_text); |
| 959 | return; |
| 960 | } |
| 961 | |
| 962 | /* Put back the modified character. */ |
| 963 | switch (modified_char) |
| 964 | { |
| 965 | case 0: |
| 966 | break; |
| 967 | |
| 968 | default: |
| 969 | *--operands = modified_char; |
| 970 | } |
| 971 | |
| 972 | /* Try to match an opcode table slot. */ |
| 973 | for (s = operands;;) |
| 974 | { |
| 975 | int imm_expr_found; |
| 976 | |
| 977 | /* Initialize *prefixp, perhaps after being modified for a |
| 978 | "near match". */ |
| 979 | prefixp->kind = PREFIX_NONE; |
| 980 | prefixp->reloc = BFD_RELOC_NONE; |
| 981 | |
| 982 | /* Initialize *out_insnp. */ |
| 983 | memset (out_insnp, 0, sizeof (*out_insnp)); |
| 984 | out_insnp->opcode = instruction->match; |
| 985 | out_insnp->reloc = BFD_RELOC_NONE; |
| 986 | out_insnp->insn_type = CRIS_INSN_NORMAL; |
| 987 | out_insnp->imm_oprnd_size = 0; |
| 988 | |
| 989 | imm_expr_found = 0; |
| 990 | |
| 991 | /* Build the opcode, checking as we go to make sure that the |
| 992 | operands match. */ |
| 993 | for (args = instruction->args;; ++args) |
| 994 | { |
| 995 | switch (*args) |
| 996 | { |
| 997 | case '\0': |
| 998 | /* If we've come to the end of arguments, we're done. */ |
| 999 | if (*s == '\0') |
| 1000 | match = 1; |
| 1001 | break; |
| 1002 | |
| 1003 | case '!': |
| 1004 | /* Non-matcher character for disassembly. |
| 1005 | Ignore it here. */ |
| 1006 | continue; |
| 1007 | |
| 1008 | case ',': |
| 1009 | case ' ': |
| 1010 | /* These must match exactly. */ |
| 1011 | if (*s++ == *args) |
| 1012 | continue; |
| 1013 | break; |
| 1014 | |
| 1015 | case 'B': |
| 1016 | /* This is not really an operand, but causes a "BDAP |
| 1017 | -size,SP" prefix to be output, for PUSH instructions. */ |
| 1018 | prefixp->kind = PREFIX_PUSH; |
| 1019 | continue; |
| 1020 | |
| 1021 | case 'b': |
| 1022 | /* This letter marks an operand that should not be matched |
| 1023 | in the assembler. It is a branch with 16-bit |
| 1024 | displacement. The assembler will create them from the |
| 1025 | 8-bit flavor when necessary. The assembler does not |
| 1026 | support the [rN+] operand, as the [r15+] that is |
| 1027 | generated for 16-bit displacements. */ |
| 1028 | break; |
| 1029 | |
| 1030 | case 'c': |
| 1031 | /* A 5-bit unsigned immediate in bits <4:0>. */ |
| 1032 | if (! cris_get_expression (&s, &out_insnp->expr)) |
| 1033 | break; |
| 1034 | else |
| 1035 | { |
| 1036 | if (out_insnp->expr.X_op == O_constant |
| 1037 | && (out_insnp->expr.X_add_number < 0 |
| 1038 | || out_insnp->expr.X_add_number > 31)) |
| 1039 | as_bad (_("Immediate value not in 5 bit unsigned range: %ld"), |
| 1040 | out_insnp->expr.X_add_number); |
| 1041 | |
| 1042 | out_insnp->reloc = BFD_RELOC_CRIS_UNSIGNED_5; |
| 1043 | continue; |
| 1044 | } |
| 1045 | |
| 1046 | case 'C': |
| 1047 | /* A 4-bit unsigned immediate in bits <3:0>. */ |
| 1048 | if (! cris_get_expression (&s, &out_insnp->expr)) |
| 1049 | break; |
| 1050 | else |
| 1051 | { |
| 1052 | if (out_insnp->expr.X_op == O_constant |
| 1053 | && (out_insnp->expr.X_add_number < 0 |
| 1054 | || out_insnp->expr.X_add_number > 15)) |
| 1055 | as_bad (_("Immediate value not in 4 bit unsigned range: %ld"), |
| 1056 | out_insnp->expr.X_add_number); |
| 1057 | |
| 1058 | out_insnp->reloc = BFD_RELOC_CRIS_UNSIGNED_4; |
| 1059 | continue; |
| 1060 | } |
| 1061 | |
| 1062 | case 'D': |
| 1063 | /* General register in bits <15:12> and <3:0>. */ |
| 1064 | if (! get_gen_reg (&s, ®no)) |
| 1065 | break; |
| 1066 | else |
| 1067 | { |
| 1068 | out_insnp->opcode |= regno /* << 0 */; |
| 1069 | out_insnp->opcode |= regno << 12; |
| 1070 | continue; |
| 1071 | } |
| 1072 | |
| 1073 | case 'f': |
| 1074 | /* Flags from the condition code register. */ |
| 1075 | { |
| 1076 | int flags = 0; |
| 1077 | |
| 1078 | if (! get_flags (&s, &flags)) |
| 1079 | break; |
| 1080 | |
| 1081 | out_insnp->opcode |= ((flags & 0xf0) << 8) | (flags & 0xf); |
| 1082 | continue; |
| 1083 | } |
| 1084 | |
| 1085 | case 'i': |
| 1086 | /* A 6-bit signed immediate in bits <5:0>. */ |
| 1087 | if (! cris_get_expression (&s, &out_insnp->expr)) |
| 1088 | break; |
| 1089 | else |
| 1090 | { |
| 1091 | if (out_insnp->expr.X_op == O_constant |
| 1092 | && (out_insnp->expr.X_add_number < -32 |
| 1093 | || out_insnp->expr.X_add_number > 31)) |
| 1094 | as_bad (_("Immediate value not in 6 bit range: %ld"), |
| 1095 | out_insnp->expr.X_add_number); |
| 1096 | out_insnp->reloc = BFD_RELOC_CRIS_SIGNED_6; |
| 1097 | continue; |
| 1098 | } |
| 1099 | |
| 1100 | case 'I': |
| 1101 | /* A 6-bit unsigned immediate in bits <5:0>. */ |
| 1102 | if (! cris_get_expression (&s, &out_insnp->expr)) |
| 1103 | break; |
| 1104 | else |
| 1105 | { |
| 1106 | if (out_insnp->expr.X_op == O_constant |
| 1107 | && (out_insnp->expr.X_add_number < 0 |
| 1108 | || out_insnp->expr.X_add_number > 63)) |
| 1109 | as_bad (_("Immediate value not in 6 bit unsigned range: %ld"), |
| 1110 | out_insnp->expr.X_add_number); |
| 1111 | out_insnp->reloc = BFD_RELOC_CRIS_UNSIGNED_6; |
| 1112 | continue; |
| 1113 | } |
| 1114 | |
| 1115 | case 'M': |
| 1116 | /* A size modifier, B, W or D, to be put in a bit position |
| 1117 | suitable for CLEAR instructions (i.e. reflecting a zero |
| 1118 | register). */ |
| 1119 | if (! get_bwd_size_modifier (&s, &size_bits)) |
| 1120 | break; |
| 1121 | else |
| 1122 | { |
| 1123 | switch (size_bits) |
| 1124 | { |
| 1125 | case 0: |
| 1126 | out_insnp->opcode |= 0 << 12; |
| 1127 | break; |
| 1128 | |
| 1129 | case 1: |
| 1130 | out_insnp->opcode |= 4 << 12; |
| 1131 | break; |
| 1132 | |
| 1133 | case 2: |
| 1134 | out_insnp->opcode |= 8 << 12; |
| 1135 | break; |
| 1136 | } |
| 1137 | continue; |
| 1138 | } |
| 1139 | |
| 1140 | case 'm': |
| 1141 | /* A size modifier, B, W or D, to be put in bits <5:4>. */ |
| 1142 | if (! get_bwd_size_modifier (&s, &size_bits)) |
| 1143 | break; |
| 1144 | else |
| 1145 | { |
| 1146 | out_insnp->opcode |= size_bits << 4; |
| 1147 | continue; |
| 1148 | } |
| 1149 | |
| 1150 | case 'o': |
| 1151 | /* A branch expression. */ |
| 1152 | if (! cris_get_expression (&s, &out_insnp->expr)) |
| 1153 | break; |
| 1154 | else |
| 1155 | { |
| 1156 | out_insnp->insn_type = CRIS_INSN_BRANCH; |
| 1157 | continue; |
| 1158 | } |
| 1159 | |
| 1160 | case 'O': |
| 1161 | /* A BDAP expression for any size, "expr,r". */ |
| 1162 | if (! cris_get_expression (&s, &prefixp->expr)) |
| 1163 | break; |
| 1164 | else |
| 1165 | { |
| 1166 | if (*s != ',') |
| 1167 | break; |
| 1168 | |
| 1169 | s++; |
| 1170 | |
| 1171 | if (!get_gen_reg (&s, &prefixp->base_reg_number)) |
| 1172 | break; |
| 1173 | |
| 1174 | /* Since 'O' is used with an explicit bdap, we have no |
| 1175 | "real" instruction. */ |
| 1176 | prefixp->kind = PREFIX_BDAP_IMM; |
| 1177 | prefixp->opcode |
| 1178 | = BDAP_QUICK_OPCODE | (prefixp->base_reg_number << 12); |
| 1179 | |
| 1180 | out_insnp->insn_type = CRIS_INSN_NONE; |
| 1181 | continue; |
| 1182 | } |
| 1183 | |
| 1184 | case 'P': |
| 1185 | /* Special register in bits <15:12>. */ |
| 1186 | if (! get_spec_reg (&s, &out_insnp->spec_reg)) |
| 1187 | break; |
| 1188 | else |
| 1189 | { |
| 1190 | /* Use of some special register names come with a |
| 1191 | specific warning. Note that we have no ".cpu type" |
| 1192 | pseudo yet, so some of this is just unused |
| 1193 | framework. */ |
| 1194 | if (out_insnp->spec_reg->warning) |
| 1195 | as_warn (out_insnp->spec_reg->warning); |
| 1196 | else if (out_insnp->spec_reg->applicable_version |
| 1197 | == cris_ver_warning) |
| 1198 | /* Others have a generic warning. */ |
| 1199 | as_warn (_("Unimplemented register `%s' specified"), |
| 1200 | out_insnp->spec_reg->name); |
| 1201 | |
| 1202 | out_insnp->opcode |
| 1203 | |= out_insnp->spec_reg->number << 12; |
| 1204 | continue; |
| 1205 | } |
| 1206 | |
| 1207 | case 'p': |
| 1208 | /* This character is used in the disassembler to |
| 1209 | recognize a prefix instruction to fold into the |
| 1210 | addressing mode for the next instruction. It is |
| 1211 | ignored here. */ |
| 1212 | continue; |
| 1213 | |
| 1214 | case 'R': |
| 1215 | /* General register in bits <15:12>. */ |
| 1216 | if (! get_gen_reg (&s, ®no)) |
| 1217 | break; |
| 1218 | else |
| 1219 | { |
| 1220 | out_insnp->opcode |= regno << 12; |
| 1221 | continue; |
| 1222 | } |
| 1223 | |
| 1224 | case 'r': |
| 1225 | /* General register in bits <3:0>. */ |
| 1226 | if (! get_gen_reg (&s, ®no)) |
| 1227 | break; |
| 1228 | else |
| 1229 | { |
| 1230 | out_insnp->opcode |= regno /* << 0 */; |
| 1231 | continue; |
| 1232 | } |
| 1233 | |
| 1234 | case 'S': |
| 1235 | /* Source operand in bit <10> and a prefix; a 3-operand |
| 1236 | prefix. */ |
| 1237 | if (! get_3op_or_dip_prefix_op (&s, prefixp)) |
| 1238 | break; |
| 1239 | else |
| 1240 | continue; |
| 1241 | |
| 1242 | case 's': |
| 1243 | /* Source operand in bits <10>, <3:0> and optionally a |
| 1244 | prefix; i.e. an indirect operand or an side-effect |
| 1245 | prefix. */ |
| 1246 | if (! get_autoinc_prefix_or_indir_op (&s, prefixp, &mode, |
| 1247 | ®no, |
| 1248 | &imm_expr_found, |
| 1249 | &out_insnp->expr)) |
| 1250 | break; |
| 1251 | else |
| 1252 | { |
| 1253 | if (prefixp->kind != PREFIX_NONE) |
| 1254 | { |
| 1255 | /* A prefix, so it has the autoincrement bit |
| 1256 | set. */ |
| 1257 | out_insnp->opcode |= (AUTOINCR_BIT << 8); |
| 1258 | } |
| 1259 | else |
| 1260 | { |
| 1261 | /* No prefix. The "mode" variable contains bits like |
| 1262 | whether or not this is autoincrement mode. */ |
| 1263 | out_insnp->opcode |= (mode << 10); |
| 1264 | |
| 1265 | /* If there was a PIC reloc specifier, then it was |
| 1266 | attached to the prefix. Note that we can't check |
| 1267 | that the reloc size matches, since we don't have |
| 1268 | all the operands yet in all cases. */ |
| 1269 | if (prefixp->reloc != BFD_RELOC_NONE) |
| 1270 | out_insnp->reloc = prefixp->reloc; |
| 1271 | } |
| 1272 | |
| 1273 | out_insnp->opcode |= regno /* << 0 */ ; |
| 1274 | continue; |
| 1275 | } |
| 1276 | |
| 1277 | case 'x': |
| 1278 | /* Rs.m in bits <15:12> and <5:4>. */ |
| 1279 | if (! get_gen_reg (&s, ®no) |
| 1280 | || ! get_bwd_size_modifier (&s, &size_bits)) |
| 1281 | break; |
| 1282 | else |
| 1283 | { |
| 1284 | out_insnp->opcode |= (regno << 12) | (size_bits << 4); |
| 1285 | continue; |
| 1286 | } |
| 1287 | |
| 1288 | case 'y': |
| 1289 | /* Source operand in bits <10>, <3:0> and optionally a |
| 1290 | prefix; i.e. an indirect operand or an side-effect |
| 1291 | prefix. |
| 1292 | |
| 1293 | The difference to 's' is that this does not allow an |
| 1294 | "immediate" expression. */ |
| 1295 | if (! get_autoinc_prefix_or_indir_op (&s, prefixp, |
| 1296 | &mode, ®no, |
| 1297 | &imm_expr_found, |
| 1298 | &out_insnp->expr) |
| 1299 | || imm_expr_found) |
| 1300 | break; |
| 1301 | else |
| 1302 | { |
| 1303 | if (prefixp->kind != PREFIX_NONE) |
| 1304 | { |
| 1305 | /* A prefix, and those matched here always have |
| 1306 | side-effects (see 's' case). */ |
| 1307 | out_insnp->opcode |= (AUTOINCR_BIT << 8); |
| 1308 | } |
| 1309 | else |
| 1310 | { |
| 1311 | /* No prefix. The "mode" variable contains bits |
| 1312 | like whether or not this is autoincrement |
| 1313 | mode. */ |
| 1314 | out_insnp->opcode |= (mode << 10); |
| 1315 | } |
| 1316 | |
| 1317 | out_insnp->opcode |= regno /* << 0 */; |
| 1318 | continue; |
| 1319 | } |
| 1320 | |
| 1321 | case 'z': |
| 1322 | /* Size modifier (B or W) in bit <4>. */ |
| 1323 | if (! get_bw_size_modifier (&s, &size_bits)) |
| 1324 | break; |
| 1325 | else |
| 1326 | { |
| 1327 | out_insnp->opcode |= size_bits << 4; |
| 1328 | continue; |
| 1329 | } |
| 1330 | |
| 1331 | default: |
| 1332 | BAD_CASE (*args); |
| 1333 | } |
| 1334 | |
| 1335 | /* We get here when we fail a match above or we found a |
| 1336 | complete match. Break out of this loop. */ |
| 1337 | break; |
| 1338 | } |
| 1339 | |
| 1340 | /* Was it a match or a miss? */ |
| 1341 | if (match == 0) |
| 1342 | { |
| 1343 | /* If it's just that the args don't match, maybe the next |
| 1344 | item in the table is the same opcode but with |
| 1345 | matching operands. */ |
| 1346 | if (instruction[1].name != NULL |
| 1347 | && ! strcmp (instruction->name, instruction[1].name)) |
| 1348 | { |
| 1349 | /* Yep. Restart and try that one instead. */ |
| 1350 | ++instruction; |
| 1351 | s = operands; |
| 1352 | continue; |
| 1353 | } |
| 1354 | else |
| 1355 | { |
| 1356 | /* We've come to the end of instructions with this |
| 1357 | opcode, so it must be an error. */ |
| 1358 | as_bad (_("Illegal operands")); |
| 1359 | return; |
| 1360 | } |
| 1361 | } |
| 1362 | else |
| 1363 | { |
| 1364 | /* We have a match. Check if there's anything more to do. */ |
| 1365 | if (imm_expr_found) |
| 1366 | { |
| 1367 | /* There was an immediate mode operand, so we must check |
| 1368 | that it has an appropriate size. */ |
| 1369 | switch (instruction->imm_oprnd_size) |
| 1370 | { |
| 1371 | default: |
| 1372 | case SIZE_NONE: |
| 1373 | /* Shouldn't happen; this one does not have immediate |
| 1374 | operands with different sizes. */ |
| 1375 | BAD_CASE (instruction->imm_oprnd_size); |
| 1376 | break; |
| 1377 | |
| 1378 | case SIZE_FIX_32: |
| 1379 | out_insnp->imm_oprnd_size = 4; |
| 1380 | break; |
| 1381 | |
| 1382 | case SIZE_SPEC_REG: |
| 1383 | switch (out_insnp->spec_reg->reg_size) |
| 1384 | { |
| 1385 | case 1: |
| 1386 | if (out_insnp->expr.X_op == O_constant |
| 1387 | && (out_insnp->expr.X_add_number < -128 |
| 1388 | || out_insnp->expr.X_add_number > 255)) |
| 1389 | as_bad (_("Immediate value not in 8 bit range: %ld"), |
| 1390 | out_insnp->expr.X_add_number); |
| 1391 | /* Fall through. */ |
| 1392 | case 2: |
| 1393 | /* FIXME: We need an indicator in the instruction |
| 1394 | table to pass on, to indicate if we need to check |
| 1395 | overflow for a signed or unsigned number. */ |
| 1396 | if (out_insnp->expr.X_op == O_constant |
| 1397 | && (out_insnp->expr.X_add_number < -32768 |
| 1398 | || out_insnp->expr.X_add_number > 65535)) |
| 1399 | as_bad (_("Immediate value not in 16 bit range: %ld"), |
| 1400 | out_insnp->expr.X_add_number); |
| 1401 | out_insnp->imm_oprnd_size = 2; |
| 1402 | break; |
| 1403 | |
| 1404 | case 4: |
| 1405 | out_insnp->imm_oprnd_size = 4; |
| 1406 | break; |
| 1407 | |
| 1408 | default: |
| 1409 | BAD_CASE (out_insnp->spec_reg->reg_size); |
| 1410 | } |
| 1411 | break; |
| 1412 | |
| 1413 | case SIZE_FIELD: |
| 1414 | switch (size_bits) |
| 1415 | { |
| 1416 | case 0: |
| 1417 | if (out_insnp->expr.X_op == O_constant |
| 1418 | && (out_insnp->expr.X_add_number < -128 |
| 1419 | || out_insnp->expr.X_add_number > 255)) |
| 1420 | as_bad (_("Immediate value not in 8 bit range: %ld"), |
| 1421 | out_insnp->expr.X_add_number); |
| 1422 | /* Fall through. */ |
| 1423 | case 1: |
| 1424 | if (out_insnp->expr.X_op == O_constant |
| 1425 | && (out_insnp->expr.X_add_number < -32768 |
| 1426 | || out_insnp->expr.X_add_number > 65535)) |
| 1427 | as_bad (_("Immediate value not in 16 bit range: %ld"), |
| 1428 | out_insnp->expr.X_add_number); |
| 1429 | out_insnp->imm_oprnd_size = 2; |
| 1430 | break; |
| 1431 | |
| 1432 | case 2: |
| 1433 | out_insnp->imm_oprnd_size = 4; |
| 1434 | break; |
| 1435 | |
| 1436 | default: |
| 1437 | BAD_CASE (out_insnp->spec_reg->reg_size); |
| 1438 | } |
| 1439 | } |
| 1440 | |
| 1441 | /* If there was a relocation specified for the immediate |
| 1442 | expression (i.e. it had a PIC modifier) check that the |
| 1443 | size of the PIC relocation matches the size specified by |
| 1444 | the opcode. */ |
| 1445 | if (out_insnp->reloc != BFD_RELOC_NONE |
| 1446 | && (cris_get_pic_reloc_size (out_insnp->reloc) |
| 1447 | != (unsigned int) out_insnp->imm_oprnd_size)) |
| 1448 | as_bad (_("PIC relocation size does not match operand size")); |
| 1449 | } |
| 1450 | } |
| 1451 | break; |
| 1452 | } |
| 1453 | } |
| 1454 | |
| 1455 | /* Get a B, W, or D size modifier from the string pointed out by *cPP, |
| 1456 | which must point to a '.' in front of the modifier. On successful |
| 1457 | return, *cPP is advanced to the character following the size |
| 1458 | modifier, and is undefined otherwise. |
| 1459 | |
| 1460 | cPP Pointer to pointer to string starting |
| 1461 | with the size modifier. |
| 1462 | |
| 1463 | size_bitsp Pointer to variable to contain the size bits on |
| 1464 | successful return. |
| 1465 | |
| 1466 | Return 1 iff a correct size modifier is found, else 0. */ |
| 1467 | |
| 1468 | static int |
| 1469 | get_bwd_size_modifier (cPP, size_bitsp) |
| 1470 | char **cPP; |
| 1471 | int *size_bitsp; |
| 1472 | { |
| 1473 | if (**cPP != '.') |
| 1474 | return 0; |
| 1475 | else |
| 1476 | { |
| 1477 | /* Consume the '.'. */ |
| 1478 | (*cPP)++; |
| 1479 | |
| 1480 | switch (**cPP) |
| 1481 | { |
| 1482 | case 'B': |
| 1483 | case 'b': |
| 1484 | *size_bitsp = 0; |
| 1485 | break; |
| 1486 | |
| 1487 | case 'W': |
| 1488 | case 'w': |
| 1489 | *size_bitsp = 1; |
| 1490 | break; |
| 1491 | |
| 1492 | case 'D': |
| 1493 | case 'd': |
| 1494 | *size_bitsp = 2; |
| 1495 | break; |
| 1496 | |
| 1497 | default: |
| 1498 | return 0; |
| 1499 | } |
| 1500 | |
| 1501 | /* Consume the size letter. */ |
| 1502 | (*cPP)++; |
| 1503 | return 1; |
| 1504 | } |
| 1505 | } |
| 1506 | |
| 1507 | /* Get a B or W size modifier from the string pointed out by *cPP, |
| 1508 | which must point to a '.' in front of the modifier. On successful |
| 1509 | return, *cPP is advanced to the character following the size |
| 1510 | modifier, and is undefined otherwise. |
| 1511 | |
| 1512 | cPP Pointer to pointer to string starting |
| 1513 | with the size modifier. |
| 1514 | |
| 1515 | size_bitsp Pointer to variable to contain the size bits on |
| 1516 | successful return. |
| 1517 | |
| 1518 | Return 1 iff a correct size modifier is found, else 0. */ |
| 1519 | |
| 1520 | static int |
| 1521 | get_bw_size_modifier (cPP, size_bitsp) |
| 1522 | char **cPP; |
| 1523 | int *size_bitsp; |
| 1524 | { |
| 1525 | if (**cPP != '.') |
| 1526 | return 0; |
| 1527 | else |
| 1528 | { |
| 1529 | /* Consume the '.'. */ |
| 1530 | (*cPP)++; |
| 1531 | |
| 1532 | switch (**cPP) |
| 1533 | { |
| 1534 | case 'B': |
| 1535 | case 'b': |
| 1536 | *size_bitsp = 0; |
| 1537 | break; |
| 1538 | |
| 1539 | case 'W': |
| 1540 | case 'w': |
| 1541 | *size_bitsp = 1; |
| 1542 | break; |
| 1543 | |
| 1544 | default: |
| 1545 | return 0; |
| 1546 | } |
| 1547 | |
| 1548 | /* Consume the size letter. */ |
| 1549 | (*cPP)++; |
| 1550 | return 1; |
| 1551 | } |
| 1552 | } |
| 1553 | |
| 1554 | /* Get a general register from the string pointed out by *cPP. The |
| 1555 | variable *cPP is advanced to the character following the general |
| 1556 | register name on a successful return, and has its initial position |
| 1557 | otherwise. |
| 1558 | |
| 1559 | cPP Pointer to pointer to string, beginning with a general |
| 1560 | register name. |
| 1561 | |
| 1562 | regnop Pointer to int containing the register number. |
| 1563 | |
| 1564 | Return 1 iff a correct general register designator is found, |
| 1565 | else 0. */ |
| 1566 | |
| 1567 | static int |
| 1568 | get_gen_reg (cPP, regnop) |
| 1569 | char **cPP; |
| 1570 | int *regnop; |
| 1571 | { |
| 1572 | char *oldp; |
| 1573 | oldp = *cPP; |
| 1574 | |
| 1575 | /* Handle a sometimes-mandatory dollar sign as register prefix. */ |
| 1576 | if (**cPP == REGISTER_PREFIX_CHAR) |
| 1577 | (*cPP)++; |
| 1578 | else if (demand_register_prefix) |
| 1579 | return 0; |
| 1580 | |
| 1581 | switch (**cPP) |
| 1582 | { |
| 1583 | case 'P': |
| 1584 | case 'p': |
| 1585 | /* "P" as in "PC"? Consume the "P". */ |
| 1586 | (*cPP)++; |
| 1587 | |
| 1588 | if ((**cPP == 'C' || **cPP == 'c') |
| 1589 | && ! ISALNUM ((*cPP)[1])) |
| 1590 | { |
| 1591 | /* It's "PC": consume the "c" and we're done. */ |
| 1592 | (*cPP)++; |
| 1593 | *regnop = REG_PC; |
| 1594 | return 1; |
| 1595 | } |
| 1596 | break; |
| 1597 | |
| 1598 | case 'R': |
| 1599 | case 'r': |
| 1600 | /* Hopefully r[0-9] or r1[0-5]. Consume 'R' or 'r'. */ |
| 1601 | (*cPP)++; |
| 1602 | |
| 1603 | if (ISDIGIT (**cPP)) |
| 1604 | { |
| 1605 | /* It's r[0-9]. Consume and check the next digit. */ |
| 1606 | *regnop = **cPP - '0'; |
| 1607 | (*cPP)++; |
| 1608 | |
| 1609 | if (! ISALNUM (**cPP)) |
| 1610 | { |
| 1611 | /* No more digits, we're done. */ |
| 1612 | return 1; |
| 1613 | } |
| 1614 | else |
| 1615 | { |
| 1616 | /* One more digit. Consume and add. */ |
| 1617 | *regnop = *regnop * 10 + (**cPP - '0'); |
| 1618 | |
| 1619 | /* We need to check for a valid register number; Rn, |
| 1620 | 0 <= n <= MAX_REG. */ |
| 1621 | if (*regnop <= MAX_REG) |
| 1622 | { |
| 1623 | /* Consume second digit. */ |
| 1624 | (*cPP)++; |
| 1625 | return 1; |
| 1626 | } |
| 1627 | } |
| 1628 | } |
| 1629 | break; |
| 1630 | |
| 1631 | case 'S': |
| 1632 | case 's': |
| 1633 | /* "S" as in "SP"? Consume the "S". */ |
| 1634 | (*cPP)++; |
| 1635 | if (**cPP == 'P' || **cPP == 'p') |
| 1636 | { |
| 1637 | /* It's "SP": consume the "p" and we're done. */ |
| 1638 | (*cPP)++; |
| 1639 | *regnop = REG_SP; |
| 1640 | return 1; |
| 1641 | } |
| 1642 | break; |
| 1643 | |
| 1644 | default: |
| 1645 | /* Just here to silence compilation warnings. */ |
| 1646 | ; |
| 1647 | } |
| 1648 | |
| 1649 | /* We get here if we fail. Restore the pointer. */ |
| 1650 | *cPP = oldp; |
| 1651 | return 0; |
| 1652 | } |
| 1653 | |
| 1654 | /* Get a special register from the string pointed out by *cPP. The |
| 1655 | variable *cPP is advanced to the character following the special |
| 1656 | register name if one is found, and retains its original position |
| 1657 | otherwise. |
| 1658 | |
| 1659 | cPP Pointer to pointer to string starting with a special register |
| 1660 | name. |
| 1661 | |
| 1662 | sregpp Pointer to Pointer to struct spec_reg, where a pointer to the |
| 1663 | register description will be stored. |
| 1664 | |
| 1665 | Return 1 iff a correct special register name is found. */ |
| 1666 | |
| 1667 | static int |
| 1668 | get_spec_reg (cPP, sregpp) |
| 1669 | char **cPP; |
| 1670 | const struct cris_spec_reg **sregpp; |
| 1671 | { |
| 1672 | char *s1; |
| 1673 | const char *s2; |
| 1674 | char *name_begin = *cPP; |
| 1675 | |
| 1676 | const struct cris_spec_reg *sregp; |
| 1677 | |
| 1678 | /* Handle a sometimes-mandatory dollar sign as register prefix. */ |
| 1679 | if (*name_begin == REGISTER_PREFIX_CHAR) |
| 1680 | name_begin++; |
| 1681 | else if (demand_register_prefix) |
| 1682 | return 0; |
| 1683 | |
| 1684 | /* Loop over all special registers. */ |
| 1685 | for (sregp = cris_spec_regs; sregp->name != NULL; sregp++) |
| 1686 | { |
| 1687 | /* Start over from beginning of the supposed name. */ |
| 1688 | s1 = name_begin; |
| 1689 | s2 = sregp->name; |
| 1690 | |
| 1691 | while (*s2 != '\0' && TOLOWER (*s1) == *s2) |
| 1692 | { |
| 1693 | s1++; |
| 1694 | s2++; |
| 1695 | } |
| 1696 | |
| 1697 | /* For a match, we must have consumed the name in the table, and we |
| 1698 | must be outside what could be part of a name. Assume here that a |
| 1699 | test for alphanumerics is sufficient for a name test. */ |
| 1700 | if (*s2 == 0 && ! ISALNUM (*s1)) |
| 1701 | { |
| 1702 | /* We have a match. Update the pointer and be done. */ |
| 1703 | *cPP = s1; |
| 1704 | *sregpp = sregp; |
| 1705 | return 1; |
| 1706 | } |
| 1707 | } |
| 1708 | |
| 1709 | /* If we got here, we did not find any name. */ |
| 1710 | return 0; |
| 1711 | } |
| 1712 | |
| 1713 | /* Get an unprefixed or side-effect-prefix operand from the string pointed |
| 1714 | out by *cPP. The pointer *cPP is advanced to the character following |
| 1715 | the indirect operand if we have success, else it contains an undefined |
| 1716 | value. |
| 1717 | |
| 1718 | cPP Pointer to pointer to string beginning with the first |
| 1719 | character of the supposed operand. |
| 1720 | |
| 1721 | prefixp Pointer to structure containing an optional instruction |
| 1722 | prefix. |
| 1723 | |
| 1724 | is_autoincp Pointer to int indicating the indirect or autoincrement |
| 1725 | bits. |
| 1726 | |
| 1727 | src_regnop Pointer to int containing the source register number in |
| 1728 | the instruction. |
| 1729 | |
| 1730 | imm_foundp Pointer to an int indicating if an immediate expression |
| 1731 | is found. |
| 1732 | |
| 1733 | imm_exprP Pointer to a structure containing an immediate |
| 1734 | expression, if success and if *imm_foundp is nonzero. |
| 1735 | |
| 1736 | Return 1 iff a correct indirect operand is found. */ |
| 1737 | |
| 1738 | static int |
| 1739 | get_autoinc_prefix_or_indir_op (cPP, prefixp, is_autoincp, src_regnop, |
| 1740 | imm_foundp, imm_exprP) |
| 1741 | char **cPP; |
| 1742 | struct cris_prefix *prefixp; |
| 1743 | int *is_autoincp; |
| 1744 | int *src_regnop; |
| 1745 | int *imm_foundp; |
| 1746 | expressionS *imm_exprP; |
| 1747 | { |
| 1748 | /* Assume there was no immediate mode expression. */ |
| 1749 | *imm_foundp = 0; |
| 1750 | |
| 1751 | if (**cPP == '[') |
| 1752 | { |
| 1753 | /* So this operand is one of: |
| 1754 | Indirect: [rN] |
| 1755 | Autoincrement: [rN+] |
| 1756 | Indexed with assign: [rN=rM+rO.S] |
| 1757 | Offset with assign: [rN=rM+I], [rN=rM+[rO].s], [rN=rM+[rO+].s] |
| 1758 | |
| 1759 | Either way, consume the '['. */ |
| 1760 | (*cPP)++; |
| 1761 | |
| 1762 | /* Get the rN register. */ |
| 1763 | if (! get_gen_reg (cPP, src_regnop)) |
| 1764 | /* If there was no register, then this cannot match. */ |
| 1765 | return 0; |
| 1766 | else |
| 1767 | { |
| 1768 | /* We got the register, now check the next character. */ |
| 1769 | switch (**cPP) |
| 1770 | { |
| 1771 | case ']': |
| 1772 | /* Indirect mode. We're done here. */ |
| 1773 | prefixp->kind = PREFIX_NONE; |
| 1774 | *is_autoincp = 0; |
| 1775 | break; |
| 1776 | |
| 1777 | case '+': |
| 1778 | /* This must be an auto-increment mode, if there's a |
| 1779 | match. */ |
| 1780 | prefixp->kind = PREFIX_NONE; |
| 1781 | *is_autoincp = 1; |
| 1782 | |
| 1783 | /* We consume this character and break out to check the |
| 1784 | closing ']'. */ |
| 1785 | (*cPP)++; |
| 1786 | break; |
| 1787 | |
| 1788 | case '=': |
| 1789 | /* This must be indexed with assign, or offset with assign |
| 1790 | to match. */ |
| 1791 | (*cPP)++; |
| 1792 | |
| 1793 | /* Either way, the next thing must be a register. */ |
| 1794 | if (! get_gen_reg (cPP, &prefixp->base_reg_number)) |
| 1795 | /* No register, no match. */ |
| 1796 | return 0; |
| 1797 | else |
| 1798 | { |
| 1799 | /* We've consumed "[rN=rM", so we must be looking at |
| 1800 | "+rO.s]" or "+I]", or "-I]", or "+[rO].s]" or |
| 1801 | "+[rO+].s]". */ |
| 1802 | if (**cPP == '+') |
| 1803 | { |
| 1804 | int index_reg_number; |
| 1805 | (*cPP)++; |
| 1806 | |
| 1807 | if (**cPP == '[') |
| 1808 | { |
| 1809 | int size_bits; |
| 1810 | /* This must be [rx=ry+[rz].s] or |
| 1811 | [rx=ry+[rz+].s] or no match. We must be |
| 1812 | looking at rz after consuming the '['. */ |
| 1813 | (*cPP)++; |
| 1814 | |
| 1815 | if (!get_gen_reg (cPP, &index_reg_number)) |
| 1816 | return 0; |
| 1817 | |
| 1818 | prefixp->kind = PREFIX_BDAP; |
| 1819 | prefixp->opcode |
| 1820 | = (BDAP_INDIR_OPCODE |
| 1821 | + (prefixp->base_reg_number << 12) |
| 1822 | + index_reg_number); |
| 1823 | |
| 1824 | if (**cPP == '+') |
| 1825 | { |
| 1826 | /* We've seen "[rx=ry+[rz+" here, so now we |
| 1827 | know that there must be "].s]" left to |
| 1828 | check. */ |
| 1829 | (*cPP)++; |
| 1830 | prefixp->opcode |= AUTOINCR_BIT << 8; |
| 1831 | } |
| 1832 | |
| 1833 | /* If it wasn't autoincrement, we don't need to |
| 1834 | add anything. */ |
| 1835 | |
| 1836 | /* Check the next-to-last ']'. */ |
| 1837 | if (**cPP != ']') |
| 1838 | return 0; |
| 1839 | |
| 1840 | (*cPP)++; |
| 1841 | |
| 1842 | /* Check the ".s" modifier. */ |
| 1843 | if (! get_bwd_size_modifier (cPP, &size_bits)) |
| 1844 | return 0; |
| 1845 | |
| 1846 | prefixp->opcode |= size_bits << 4; |
| 1847 | |
| 1848 | /* Now we got [rx=ry+[rz+].s or [rx=ry+[rz].s. |
| 1849 | We break out to check the final ']'. */ |
| 1850 | break; |
| 1851 | } |
| 1852 | /* It wasn't an indirection. Check if it's a |
| 1853 | register. */ |
| 1854 | else if (get_gen_reg (cPP, &index_reg_number)) |
| 1855 | { |
| 1856 | int size_bits; |
| 1857 | |
| 1858 | /* Indexed with assign mode: "[rN+rM.S]". */ |
| 1859 | prefixp->kind = PREFIX_BIAP; |
| 1860 | prefixp->opcode |
| 1861 | = (BIAP_OPCODE + (index_reg_number << 12) |
| 1862 | + prefixp->base_reg_number /* << 0 */); |
| 1863 | |
| 1864 | if (! get_bwd_size_modifier (cPP, &size_bits)) |
| 1865 | /* Size missing, this isn't a match. */ |
| 1866 | return 0; |
| 1867 | else |
| 1868 | { |
| 1869 | /* Size found, break out to check the |
| 1870 | final ']'. */ |
| 1871 | prefixp->opcode |= size_bits << 4; |
| 1872 | break; |
| 1873 | } |
| 1874 | } |
| 1875 | /* Not a register. Then this must be "[rN+I]". */ |
| 1876 | else if (cris_get_expression (cPP, &prefixp->expr)) |
| 1877 | { |
| 1878 | /* We've got offset with assign mode. Fill |
| 1879 | in the blanks and break out to match the |
| 1880 | final ']'. */ |
| 1881 | prefixp->kind = PREFIX_BDAP_IMM; |
| 1882 | |
| 1883 | /* We tentatively put an opcode corresponding to |
| 1884 | a 32-bit operand here, although it may be |
| 1885 | relaxed when there's no PIC specifier for the |
| 1886 | operand. */ |
| 1887 | prefixp->opcode |
| 1888 | = (BDAP_INDIR_OPCODE |
| 1889 | | (prefixp->base_reg_number << 12) |
| 1890 | | (AUTOINCR_BIT << 8) |
| 1891 | | (2 << 4) |
| 1892 | | REG_PC /* << 0 */); |
| 1893 | |
| 1894 | /* This can have a PIC suffix, specifying reloc |
| 1895 | type to use. */ |
| 1896 | if (pic && **cPP == PIC_SUFFIX_CHAR) |
| 1897 | { |
| 1898 | unsigned int relocsize; |
| 1899 | |
| 1900 | cris_get_pic_suffix (cPP, &prefixp->reloc, |
| 1901 | &prefixp->expr); |
| 1902 | |
| 1903 | /* Tweak the size of the immediate operand |
| 1904 | in the prefix opcode if it isn't what we |
| 1905 | set. */ |
| 1906 | relocsize |
| 1907 | = cris_get_pic_reloc_size (prefixp->reloc); |
| 1908 | if (relocsize != 4) |
| 1909 | prefixp->opcode |
| 1910 | = ((prefixp->opcode & ~(3 << 4)) |
| 1911 | | ((relocsize >> 1) << 4)); |
| 1912 | } |
| 1913 | break; |
| 1914 | } |
| 1915 | else |
| 1916 | /* Neither register nor expression found, so |
| 1917 | this can't be a match. */ |
| 1918 | return 0; |
| 1919 | } |
| 1920 | /* Not "[rN+" but perhaps "[rN-"? */ |
| 1921 | else if (**cPP == '-') |
| 1922 | { |
| 1923 | /* We must have an offset with assign mode. */ |
| 1924 | if (! cris_get_expression (cPP, &prefixp->expr)) |
| 1925 | /* No expression, no match. */ |
| 1926 | return 0; |
| 1927 | else |
| 1928 | { |
| 1929 | /* We've got offset with assign mode. Fill |
| 1930 | in the blanks and break out to match the |
| 1931 | final ']'. |
| 1932 | |
| 1933 | Note that we don't allow a PIC suffix for an |
| 1934 | operand with a minus sign. */ |
| 1935 | prefixp->kind = PREFIX_BDAP_IMM; |
| 1936 | break; |
| 1937 | } |
| 1938 | } |
| 1939 | else |
| 1940 | /* Neither '+' nor '-' after "[rN=rM". Lose. */ |
| 1941 | return 0; |
| 1942 | } |
| 1943 | default: |
| 1944 | /* Neither ']' nor '+' nor '=' after "[rN". Lose. */ |
| 1945 | return 0; |
| 1946 | } |
| 1947 | } |
| 1948 | |
| 1949 | /* When we get here, we have a match and will just check the closing |
| 1950 | ']'. We can still fail though. */ |
| 1951 | if (**cPP != ']') |
| 1952 | return 0; |
| 1953 | else |
| 1954 | { |
| 1955 | /* Don't forget to consume the final ']'. |
| 1956 | Then return in glory. */ |
| 1957 | (*cPP)++; |
| 1958 | return 1; |
| 1959 | } |
| 1960 | } |
| 1961 | /* No indirection. Perhaps a constant? */ |
| 1962 | else if (cris_get_expression (cPP, imm_exprP)) |
| 1963 | { |
| 1964 | /* Expression found, this is immediate mode. */ |
| 1965 | prefixp->kind = PREFIX_NONE; |
| 1966 | *is_autoincp = 1; |
| 1967 | *src_regnop = REG_PC; |
| 1968 | *imm_foundp = 1; |
| 1969 | |
| 1970 | /* This can have a PIC suffix, specifying reloc type to use. The |
| 1971 | caller must check that the reloc size matches the operand size. */ |
| 1972 | if (pic && **cPP == PIC_SUFFIX_CHAR) |
| 1973 | cris_get_pic_suffix (cPP, &prefixp->reloc, imm_exprP); |
| 1974 | |
| 1975 | return 1; |
| 1976 | } |
| 1977 | |
| 1978 | /* No luck today. */ |
| 1979 | return 0; |
| 1980 | } |
| 1981 | |
| 1982 | /* This function gets an indirect operand in a three-address operand |
| 1983 | combination from the string pointed out by *cPP. The pointer *cPP is |
| 1984 | advanced to the character following the indirect operand on success, or |
| 1985 | has an unspecified value on failure. |
| 1986 | |
| 1987 | cPP Pointer to pointer to string begining |
| 1988 | with the operand |
| 1989 | |
| 1990 | prefixp Pointer to structure containing an |
| 1991 | instruction prefix |
| 1992 | |
| 1993 | Returns 1 iff a correct indirect operand is found. */ |
| 1994 | |
| 1995 | static int |
| 1996 | get_3op_or_dip_prefix_op (cPP, prefixp) |
| 1997 | char **cPP; |
| 1998 | struct cris_prefix *prefixp; |
| 1999 | { |
| 2000 | int reg_number; |
| 2001 | |
| 2002 | if (**cPP != '[') |
| 2003 | /* We must have a '[' or it's a clean failure. */ |
| 2004 | return 0; |
| 2005 | |
| 2006 | /* Eat the first '['. */ |
| 2007 | (*cPP)++; |
| 2008 | |
| 2009 | if (**cPP == '[') |
| 2010 | { |
| 2011 | /* A second '[', so this must be double-indirect mode. */ |
| 2012 | (*cPP)++; |
| 2013 | prefixp->kind = PREFIX_DIP; |
| 2014 | prefixp->opcode = DIP_OPCODE; |
| 2015 | |
| 2016 | /* Get the register or fail entirely. */ |
| 2017 | if (! get_gen_reg (cPP, ®_number)) |
| 2018 | return 0; |
| 2019 | else |
| 2020 | { |
| 2021 | prefixp->opcode |= reg_number /* << 0 */ ; |
| 2022 | if (**cPP == '+') |
| 2023 | { |
| 2024 | /* Since we found a '+', this must be double-indirect |
| 2025 | autoincrement mode. */ |
| 2026 | (*cPP)++; |
| 2027 | prefixp->opcode |= AUTOINCR_BIT << 8; |
| 2028 | } |
| 2029 | |
| 2030 | /* There's nothing particular to do, if this was a |
| 2031 | double-indirect *without* autoincrement. */ |
| 2032 | } |
| 2033 | |
| 2034 | /* Check the first ']'. The second one is checked at the end. */ |
| 2035 | if (**cPP != ']') |
| 2036 | return 0; |
| 2037 | |
| 2038 | /* Eat the first ']', so we'll be looking at a second ']'. */ |
| 2039 | (*cPP)++; |
| 2040 | } |
| 2041 | /* No second '['. Then we should have a register here, making |
| 2042 | it "[rN". */ |
| 2043 | else if (get_gen_reg (cPP, &prefixp->base_reg_number)) |
| 2044 | { |
| 2045 | /* This must be indexed or offset mode: "[rN+I]" or |
| 2046 | "[rN+rM.S]" or "[rN+[rM].S]" or "[rN+[rM+].S]". */ |
| 2047 | if (**cPP == '+') |
| 2048 | { |
| 2049 | int index_reg_number; |
| 2050 | |
| 2051 | (*cPP)++; |
| 2052 | |
| 2053 | if (**cPP == '[') |
| 2054 | { |
| 2055 | /* This is "[rx+["... Expect a register next. */ |
| 2056 | int size_bits; |
| 2057 | (*cPP)++; |
| 2058 | |
| 2059 | if (!get_gen_reg (cPP, &index_reg_number)) |
| 2060 | return 0; |
| 2061 | |
| 2062 | prefixp->kind = PREFIX_BDAP; |
| 2063 | prefixp->opcode |
| 2064 | = (BDAP_INDIR_OPCODE |
| 2065 | + (prefixp->base_reg_number << 12) |
| 2066 | + index_reg_number); |
| 2067 | |
| 2068 | /* We've seen "[rx+[ry", so check if this is |
| 2069 | autoincrement. */ |
| 2070 | if (**cPP == '+') |
| 2071 | { |
| 2072 | /* Yep, now at "[rx+[ry+". */ |
| 2073 | (*cPP)++; |
| 2074 | prefixp->opcode |= AUTOINCR_BIT << 8; |
| 2075 | } |
| 2076 | /* If it wasn't autoincrement, we don't need to |
| 2077 | add anything. */ |
| 2078 | |
| 2079 | /* Check a first closing ']': "[rx+[ry]" or |
| 2080 | "[rx+[ry+]". */ |
| 2081 | if (**cPP != ']') |
| 2082 | return 0; |
| 2083 | (*cPP)++; |
| 2084 | |
| 2085 | /* Now expect a size modifier ".S". */ |
| 2086 | if (! get_bwd_size_modifier (cPP, &size_bits)) |
| 2087 | return 0; |
| 2088 | |
| 2089 | prefixp->opcode |= size_bits << 4; |
| 2090 | |
| 2091 | /* Ok, all interesting stuff has been seen: |
| 2092 | "[rx+[ry+].S" or "[rx+[ry].S". We only need to |
| 2093 | expect a final ']', which we'll do in a common |
| 2094 | closing session. */ |
| 2095 | } |
| 2096 | /* Seen "[rN+", but not a '[', so check if we have a |
| 2097 | register. */ |
| 2098 | else if (get_gen_reg (cPP, &index_reg_number)) |
| 2099 | { |
| 2100 | /* This is indexed mode: "[rN+rM.S]" or |
| 2101 | "[rN+rM.S+]". */ |
| 2102 | int size_bits; |
| 2103 | prefixp->kind = PREFIX_BIAP; |
| 2104 | prefixp->opcode |
| 2105 | = (BIAP_OPCODE |
| 2106 | | prefixp->base_reg_number /* << 0 */ |
| 2107 | | (index_reg_number << 12)); |
| 2108 | |
| 2109 | /* Consume the ".S". */ |
| 2110 | if (! get_bwd_size_modifier (cPP, &size_bits)) |
| 2111 | /* Missing size, so fail. */ |
| 2112 | return 0; |
| 2113 | else |
| 2114 | /* Size found. Add that piece and drop down to |
| 2115 | the common checking of the closing ']'. */ |
| 2116 | prefixp->opcode |= size_bits << 4; |
| 2117 | } |
| 2118 | /* Seen "[rN+", but not a '[' or a register, so then |
| 2119 | it must be a constant "I". */ |
| 2120 | else if (cris_get_expression (cPP, &prefixp->expr)) |
| 2121 | { |
| 2122 | /* Expression found, so fill in the bits of offset |
| 2123 | mode and drop down to check the closing ']'. */ |
| 2124 | prefixp->kind = PREFIX_BDAP_IMM; |
| 2125 | |
| 2126 | /* We tentatively put an opcode corresponding to a 32-bit |
| 2127 | operand here, although it may be relaxed when there's no |
| 2128 | PIC specifier for the operand. */ |
| 2129 | prefixp->opcode |
| 2130 | = (BDAP_INDIR_OPCODE |
| 2131 | | (prefixp->base_reg_number << 12) |
| 2132 | | (AUTOINCR_BIT << 8) |
| 2133 | | (2 << 4) |
| 2134 | | REG_PC /* << 0 */); |
| 2135 | |
| 2136 | /* This can have a PIC suffix, specifying reloc type to use. */ |
| 2137 | if (pic && **cPP == PIC_SUFFIX_CHAR) |
| 2138 | { |
| 2139 | unsigned int relocsize; |
| 2140 | |
| 2141 | cris_get_pic_suffix (cPP, &prefixp->reloc, &prefixp->expr); |
| 2142 | |
| 2143 | /* Tweak the size of the immediate operand in the prefix |
| 2144 | opcode if it isn't what we set. */ |
| 2145 | relocsize = cris_get_pic_reloc_size (prefixp->reloc); |
| 2146 | if (relocsize != 4) |
| 2147 | prefixp->opcode |
| 2148 | = ((prefixp->opcode & ~(3 << 4)) |
| 2149 | | ((relocsize >> 1) << 4)); |
| 2150 | } |
| 2151 | } |
| 2152 | else |
| 2153 | /* Nothing valid here: lose. */ |
| 2154 | return 0; |
| 2155 | } |
| 2156 | /* Seen "[rN" but no '+', so check if it's a '-'. */ |
| 2157 | else if (**cPP == '-') |
| 2158 | { |
| 2159 | /* Yep, we must have offset mode. */ |
| 2160 | if (! cris_get_expression (cPP, &prefixp->expr)) |
| 2161 | /* No expression, so we lose. */ |
| 2162 | return 0; |
| 2163 | else |
| 2164 | { |
| 2165 | /* Expression found to make this offset mode, so |
| 2166 | fill those bits and drop down to check the |
| 2167 | closing ']'. |
| 2168 | |
| 2169 | Note that we don't allow a PIC suffix for |
| 2170 | an operand with a minus sign like this. */ |
| 2171 | prefixp->kind = PREFIX_BDAP_IMM; |
| 2172 | } |
| 2173 | } |
| 2174 | else |
| 2175 | { |
| 2176 | /* We've seen "[rN", but not '+' or '-'; rather a ']'. |
| 2177 | Hmm. Normally this is a simple indirect mode that we |
| 2178 | shouldn't match, but if we expect ']', then we have a |
| 2179 | zero offset, so it can be a three-address-operand, |
| 2180 | like "[rN],rO,rP", thus offset mode. |
| 2181 | |
| 2182 | Don't eat the ']', that will be done in the closing |
| 2183 | ceremony. */ |
| 2184 | prefixp->expr.X_op = O_constant; |
| 2185 | prefixp->expr.X_add_number = 0; |
| 2186 | prefixp->expr.X_add_symbol = NULL; |
| 2187 | prefixp->expr.X_op_symbol = NULL; |
| 2188 | prefixp->kind = PREFIX_BDAP_IMM; |
| 2189 | } |
| 2190 | } |
| 2191 | /* A '[', but no second '[', and no register. Check if we |
| 2192 | have an expression, making this "[I]" for a double-indirect |
| 2193 | prefix. */ |
| 2194 | else if (cris_get_expression (cPP, &prefixp->expr)) |
| 2195 | { |
| 2196 | /* Expression found, the so called absolute mode for a |
| 2197 | double-indirect prefix on PC. */ |
| 2198 | prefixp->kind = PREFIX_DIP; |
| 2199 | prefixp->opcode = DIP_OPCODE | (AUTOINCR_BIT << 8) | REG_PC; |
| 2200 | prefixp->reloc = BFD_RELOC_32; |
| 2201 | } |
| 2202 | else |
| 2203 | /* Neither '[' nor register nor expression. We lose. */ |
| 2204 | return 0; |
| 2205 | |
| 2206 | /* We get here as a closing ceremony to a successful match. We just |
| 2207 | need to check the closing ']'. */ |
| 2208 | if (**cPP != ']') |
| 2209 | /* Oops. Close but no air-polluter. */ |
| 2210 | return 0; |
| 2211 | |
| 2212 | /* Don't forget to consume that ']', before returning in glory. */ |
| 2213 | (*cPP)++; |
| 2214 | return 1; |
| 2215 | } |
| 2216 | |
| 2217 | /* Get an expression from the string pointed out by *cPP. |
| 2218 | The pointer *cPP is advanced to the character following the expression |
| 2219 | on a success, or retains its original value otherwise. |
| 2220 | |
| 2221 | cPP Pointer to pointer to string beginning with the expression. |
| 2222 | |
| 2223 | exprP Pointer to structure containing the expression. |
| 2224 | |
| 2225 | Return 1 iff a correct expression is found. */ |
| 2226 | |
| 2227 | static int |
| 2228 | cris_get_expression (cPP, exprP) |
| 2229 | char **cPP; |
| 2230 | expressionS *exprP; |
| 2231 | { |
| 2232 | char *saved_input_line_pointer; |
| 2233 | segT exp; |
| 2234 | |
| 2235 | /* The "expression" function expects to find an expression at the |
| 2236 | global variable input_line_pointer, so we have to save it to give |
| 2237 | the impression that we don't fiddle with global variables. */ |
| 2238 | saved_input_line_pointer = input_line_pointer; |
| 2239 | input_line_pointer = *cPP; |
| 2240 | |
| 2241 | exp = expression (exprP); |
| 2242 | if (exprP->X_op == O_illegal || exprP->X_op == O_absent) |
| 2243 | { |
| 2244 | input_line_pointer = saved_input_line_pointer; |
| 2245 | return 0; |
| 2246 | } |
| 2247 | |
| 2248 | /* Everything seems to be fine, just restore the global |
| 2249 | input_line_pointer and say we're successful. */ |
| 2250 | *cPP = input_line_pointer; |
| 2251 | input_line_pointer = saved_input_line_pointer; |
| 2252 | return 1; |
| 2253 | } |
| 2254 | |
| 2255 | /* Get a sequence of flag characters from *spp. The pointer *cPP is |
| 2256 | advanced to the character following the expression. The flag |
| 2257 | characters are consecutive, no commas or spaces. |
| 2258 | |
| 2259 | cPP Pointer to pointer to string beginning with the expression. |
| 2260 | |
| 2261 | flagp Pointer to int to return the flags expression. |
| 2262 | |
| 2263 | Return 1 iff a correct flags expression is found. */ |
| 2264 | |
| 2265 | static int |
| 2266 | get_flags (cPP, flagsp) |
| 2267 | char **cPP; |
| 2268 | int *flagsp; |
| 2269 | { |
| 2270 | for (;;) |
| 2271 | { |
| 2272 | switch (**cPP) |
| 2273 | { |
| 2274 | case 'd': |
| 2275 | case 'D': |
| 2276 | case 'm': |
| 2277 | case 'M': |
| 2278 | *flagsp |= 0x80; |
| 2279 | break; |
| 2280 | |
| 2281 | case 'e': |
| 2282 | case 'E': |
| 2283 | case 'b': |
| 2284 | case 'B': |
| 2285 | *flagsp |= 0x40; |
| 2286 | break; |
| 2287 | |
| 2288 | case 'i': |
| 2289 | case 'I': |
| 2290 | *flagsp |= 0x20; |
| 2291 | break; |
| 2292 | |
| 2293 | case 'x': |
| 2294 | case 'X': |
| 2295 | *flagsp |= 0x10; |
| 2296 | break; |
| 2297 | |
| 2298 | case 'n': |
| 2299 | case 'N': |
| 2300 | *flagsp |= 0x8; |
| 2301 | break; |
| 2302 | |
| 2303 | case 'z': |
| 2304 | case 'Z': |
| 2305 | *flagsp |= 0x4; |
| 2306 | break; |
| 2307 | |
| 2308 | case 'v': |
| 2309 | case 'V': |
| 2310 | *flagsp |= 0x2; |
| 2311 | break; |
| 2312 | |
| 2313 | case 'c': |
| 2314 | case 'C': |
| 2315 | *flagsp |= 1; |
| 2316 | break; |
| 2317 | |
| 2318 | default: |
| 2319 | /* We consider this successful if we stop at a comma or |
| 2320 | whitespace. Anything else, and we consider it a failure. */ |
| 2321 | if (**cPP != ',' |
| 2322 | && **cPP != 0 |
| 2323 | && ! ISSPACE (**cPP)) |
| 2324 | return 0; |
| 2325 | else |
| 2326 | return 1; |
| 2327 | } |
| 2328 | |
| 2329 | /* Don't forget to consume each flag character. */ |
| 2330 | (*cPP)++; |
| 2331 | } |
| 2332 | } |
| 2333 | |
| 2334 | /* Generate code and fixes for a BDAP prefix. |
| 2335 | |
| 2336 | base_regno Int containing the base register number. |
| 2337 | |
| 2338 | exprP Pointer to structure containing the offset expression. */ |
| 2339 | |
| 2340 | static void |
| 2341 | gen_bdap (base_regno, exprP) |
| 2342 | int base_regno; |
| 2343 | expressionS *exprP; |
| 2344 | { |
| 2345 | unsigned int opcode; |
| 2346 | char *opcodep; |
| 2347 | |
| 2348 | /* Put out the prefix opcode; assume quick immediate mode at first. */ |
| 2349 | opcode = BDAP_QUICK_OPCODE | (base_regno << 12); |
| 2350 | opcodep = cris_insn_first_word_frag (); |
| 2351 | md_number_to_chars (opcodep, opcode, 2); |
| 2352 | |
| 2353 | if (exprP->X_op == O_constant) |
| 2354 | { |
| 2355 | /* We have an absolute expression that we know the size of right |
| 2356 | now. */ |
| 2357 | long int value; |
| 2358 | int size; |
| 2359 | |
| 2360 | value = exprP->X_add_number; |
| 2361 | if (value < -32768 || value > 32767) |
| 2362 | /* Outside range for a "word", make it a dword. */ |
| 2363 | size = 2; |
| 2364 | else |
| 2365 | /* Assume "word" size. */ |
| 2366 | size = 1; |
| 2367 | |
| 2368 | /* If this is a signed-byte value, we can fit it into the prefix |
| 2369 | insn itself. */ |
| 2370 | if (value >= -128 && value <= 127) |
| 2371 | opcodep[0] = value; |
| 2372 | else |
| 2373 | { |
| 2374 | /* This is a word or dword displacement, which will be put in a |
| 2375 | word or dword after the prefix. */ |
| 2376 | char *p; |
| 2377 | |
| 2378 | opcodep[0] = BDAP_PC_LOW + (size << 4); |
| 2379 | opcodep[1] &= 0xF0; |
| 2380 | opcodep[1] |= BDAP_INCR_HIGH; |
| 2381 | p = frag_more (1 << size); |
| 2382 | md_number_to_chars (p, value, 1 << size); |
| 2383 | } |
| 2384 | } |
| 2385 | else |
| 2386 | { |
| 2387 | /* Handle complex expressions. */ |
| 2388 | valueT addvalue |
| 2389 | = exprP->X_op_symbol != NULL ? 0 : exprP->X_add_number; |
| 2390 | symbolS *sym |
| 2391 | = (exprP->X_op_symbol != NULL |
| 2392 | ? make_expr_symbol (exprP) : exprP->X_add_symbol); |
| 2393 | |
| 2394 | /* The expression is not defined yet but may become absolute. We |
| 2395 | make it a relocation to be relaxed. */ |
| 2396 | frag_var (rs_machine_dependent, 4, 0, |
| 2397 | ENCODE_RELAX (STATE_BASE_PLUS_DISP_PREFIX, STATE_UNDF), |
| 2398 | sym, addvalue, opcodep); |
| 2399 | } |
| 2400 | } |
| 2401 | |
| 2402 | /* Encode a branch displacement in the range -256..254 into the form used |
| 2403 | by CRIS conditional branch instructions. |
| 2404 | |
| 2405 | offset The displacement value in bytes. */ |
| 2406 | |
| 2407 | static int |
| 2408 | branch_disp (offset) |
| 2409 | int offset; |
| 2410 | { |
| 2411 | int disp; |
| 2412 | |
| 2413 | disp = offset & 0xFE; |
| 2414 | |
| 2415 | if (offset < 0) |
| 2416 | disp |= 1; |
| 2417 | |
| 2418 | return disp; |
| 2419 | } |
| 2420 | |
| 2421 | /* Generate code and fixes for a 32-bit conditional branch instruction |
| 2422 | created by "extending" an existing 8-bit branch instruction. |
| 2423 | |
| 2424 | opcodep Pointer to the word containing the original 8-bit branch |
| 2425 | instruction. |
| 2426 | |
| 2427 | writep Pointer to "extension area" following the first instruction |
| 2428 | word. |
| 2429 | |
| 2430 | fragP Pointer to the frag containing the instruction. |
| 2431 | |
| 2432 | add_symP, Parts of the destination address expression. |
| 2433 | sub_symP, |
| 2434 | add_num. */ |
| 2435 | |
| 2436 | static void |
| 2437 | gen_cond_branch_32 (opcodep, writep, fragP, add_symP, sub_symP, add_num) |
| 2438 | char *opcodep; |
| 2439 | char *writep; |
| 2440 | fragS *fragP; |
| 2441 | symbolS *add_symP; |
| 2442 | symbolS *sub_symP; |
| 2443 | long int add_num; |
| 2444 | { |
| 2445 | if (warn_for_branch_expansion) |
| 2446 | as_warn_where (fragP->fr_file, fragP->fr_line, |
| 2447 | _("32-bit conditional branch generated")); |
| 2448 | |
| 2449 | /* Here, writep points to what will be opcodep + 2. First, we change |
| 2450 | the actual branch in opcodep[0] and opcodep[1], so that in the |
| 2451 | final insn, it will look like: |
| 2452 | opcodep+10: Bcc .-6 |
| 2453 | |
| 2454 | This means we don't have to worry about changing the opcode or |
| 2455 | messing with the delay-slot instruction. So, we move it to last in |
| 2456 | the "extended" branch, and just change the displacement. Admittedly, |
| 2457 | it's not the optimal extended construct, but we should get this |
| 2458 | rarely enough that it shouldn't matter. */ |
| 2459 | |
| 2460 | writep[8] = branch_disp (-2 - 6); |
| 2461 | writep[9] = opcodep[1]; |
| 2462 | |
| 2463 | /* Then, we change the branch to an unconditional branch over the |
| 2464 | extended part, to the new location of the Bcc: |
| 2465 | opcodep: BA .+10 |
| 2466 | opcodep+2: NOP |
| 2467 | |
| 2468 | Note that these two writes are to currently different locations, |
| 2469 | merged later. */ |
| 2470 | |
| 2471 | md_number_to_chars (opcodep, BA_QUICK_OPCODE + 8, 2); |
| 2472 | md_number_to_chars (writep, NOP_OPCODE, 2); |
| 2473 | |
| 2474 | /* Then the extended thing, the 32-bit jump insn. |
| 2475 | opcodep+4: JUMP [PC+] |
| 2476 | or, in the PIC case, |
| 2477 | opcodep+4: ADD [PC+],PC. */ |
| 2478 | |
| 2479 | md_number_to_chars (writep + 2, |
| 2480 | pic ? ADD_PC_INCR_OPCODE : JUMP_PC_INCR_OPCODE, 2); |
| 2481 | |
| 2482 | /* We have to fill in the actual value too. |
| 2483 | opcodep+6: .DWORD |
| 2484 | This is most probably an expression, but we can cope with an absolute |
| 2485 | value too. FIXME: Testcase needed with and without pic. */ |
| 2486 | |
| 2487 | if (add_symP == NULL && sub_symP == NULL) |
| 2488 | { |
| 2489 | /* An absolute address. */ |
| 2490 | if (pic) |
| 2491 | fix_new (fragP, writep + 4 - fragP->fr_literal, 4, |
| 2492 | section_symbol (absolute_section), |
| 2493 | add_num, 1, BFD_RELOC_32_PCREL); |
| 2494 | else |
| 2495 | md_number_to_chars (writep + 4, add_num, 4); |
| 2496 | } |
| 2497 | else |
| 2498 | { |
| 2499 | if (sub_symP != NULL) |
| 2500 | as_bad_where (fragP->fr_file, fragP->fr_line, |
| 2501 | _("Complex expression not supported")); |
| 2502 | |
| 2503 | /* Not absolute, we have to make it a frag for later evaluation. */ |
| 2504 | fix_new (fragP, writep + 4 - fragP->fr_literal, 4, add_symP, |
| 2505 | add_num, pic ? 1 : 0, pic ? BFD_RELOC_32_PCREL : BFD_RELOC_32); |
| 2506 | } |
| 2507 | } |
| 2508 | |
| 2509 | /* Get the size of an immediate-reloc in bytes. Only valid for PIC |
| 2510 | relocs. */ |
| 2511 | |
| 2512 | static unsigned int |
| 2513 | cris_get_pic_reloc_size (reloc) |
| 2514 | bfd_reloc_code_real_type reloc; |
| 2515 | { |
| 2516 | return reloc == BFD_RELOC_CRIS_16_GOTPLT || reloc == BFD_RELOC_CRIS_16_GOT |
| 2517 | ? 2 : 4; |
| 2518 | } |
| 2519 | |
| 2520 | /* Store a reloc type at *RELOCP corresponding to the PIC suffix at *CPP. |
| 2521 | Adjust *EXPRP with any addend found after the PIC suffix. */ |
| 2522 | |
| 2523 | static void |
| 2524 | cris_get_pic_suffix (cPP, relocp, exprP) |
| 2525 | char **cPP; |
| 2526 | bfd_reloc_code_real_type *relocp; |
| 2527 | expressionS *exprP; |
| 2528 | { |
| 2529 | char *s = *cPP; |
| 2530 | unsigned int i; |
| 2531 | expressionS const_expr; |
| 2532 | |
| 2533 | const struct pic_suffixes_struct |
| 2534 | { |
| 2535 | const char *const suffix; |
| 2536 | unsigned int len; |
| 2537 | bfd_reloc_code_real_type reloc; |
| 2538 | } pic_suffixes[] = |
| 2539 | { |
| 2540 | #undef PICMAP |
| 2541 | #define PICMAP(s, r) {s, sizeof (s) - 1, r} |
| 2542 | /* Keep this in order with longest unambiguous prefix first. */ |
| 2543 | PICMAP ("GOTPLT16", BFD_RELOC_CRIS_16_GOTPLT), |
| 2544 | PICMAP ("GOTPLT", BFD_RELOC_CRIS_32_GOTPLT), |
| 2545 | PICMAP ("PLTG", BFD_RELOC_CRIS_32_PLT_GOTREL), |
| 2546 | PICMAP ("PLT", BFD_RELOC_CRIS_32_PLT_PCREL), |
| 2547 | PICMAP ("GOTOFF", BFD_RELOC_CRIS_32_GOTREL), |
| 2548 | PICMAP ("GOT16", BFD_RELOC_CRIS_16_GOT), |
| 2549 | PICMAP ("GOT", BFD_RELOC_CRIS_32_GOT) |
| 2550 | }; |
| 2551 | |
| 2552 | /* We've already seen the ':', so consume it. */ |
| 2553 | s++; |
| 2554 | |
| 2555 | for (i = 0; i < sizeof (pic_suffixes)/sizeof (pic_suffixes[0]); i++) |
| 2556 | { |
| 2557 | if (strncmp (s, pic_suffixes[i].suffix, pic_suffixes[i].len) == 0 |
| 2558 | && ! is_part_of_name (s[pic_suffixes[i].len])) |
| 2559 | { |
| 2560 | /* We have a match. Consume the suffix and set the relocation |
| 2561 | type. */ |
| 2562 | s += pic_suffixes[i].len; |
| 2563 | |
| 2564 | /* There can be a constant term appended. If so, we will add it |
| 2565 | to *EXPRP. */ |
| 2566 | if (*s == '+' || *s == '-') |
| 2567 | { |
| 2568 | if (! cris_get_expression (&s, &const_expr)) |
| 2569 | /* There was some kind of syntax error. Bail out. */ |
| 2570 | break; |
| 2571 | |
| 2572 | /* Allow complex expressions as the constant part. It still |
| 2573 | has to be an assembly-time constant or there will be an |
| 2574 | error emitting the reloc. This makes the PIC qualifiers |
| 2575 | idempotent; foo:GOTOFF+32 == foo+32:GOTOFF. The former we |
| 2576 | recognize here; the latter is parsed in the incoming |
| 2577 | expression. */ |
| 2578 | exprP->X_add_symbol = make_expr_symbol (exprP); |
| 2579 | exprP->X_op = O_add; |
| 2580 | exprP->X_add_number = 0; |
| 2581 | exprP->X_op_symbol = make_expr_symbol (&const_expr); |
| 2582 | } |
| 2583 | |
| 2584 | *relocp = pic_suffixes[i].reloc; |
| 2585 | *cPP = s; |
| 2586 | return; |
| 2587 | } |
| 2588 | } |
| 2589 | |
| 2590 | /* No match. Don't consume anything; fall back and there will be a |
| 2591 | syntax error. */ |
| 2592 | } |
| 2593 | |
| 2594 | /* This *could* be: |
| 2595 | |
| 2596 | Turn a string in input_line_pointer into a floating point constant |
| 2597 | of type TYPE, and store the appropriate bytes in *LITP. The number |
| 2598 | of LITTLENUMS emitted is stored in *SIZEP. |
| 2599 | |
| 2600 | type A character from FLTCHARS that describes what kind of |
| 2601 | floating-point number is wanted. |
| 2602 | |
| 2603 | litp A pointer to an array that the result should be stored in. |
| 2604 | |
| 2605 | sizep A pointer to an integer where the size of the result is stored. |
| 2606 | |
| 2607 | But we don't support floating point constants in assembly code *at all*, |
| 2608 | since it's suboptimal and just opens up bug opportunities. GCC emits |
| 2609 | the bit patterns as hex. All we could do here is to emit what GCC |
| 2610 | would have done in the first place. *Nobody* writes floating-point |
| 2611 | code as assembly code, but if they do, they should be able enough to |
| 2612 | find out the correct bit patterns and use them. */ |
| 2613 | |
| 2614 | char * |
| 2615 | md_atof (type, litp, sizep) |
| 2616 | char type ATTRIBUTE_UNUSED; |
| 2617 | char *litp ATTRIBUTE_UNUSED; |
| 2618 | int *sizep ATTRIBUTE_UNUSED; |
| 2619 | { |
| 2620 | /* FIXME: Is this function mentioned in the internals.texi manual? If |
| 2621 | not, add it. */ |
| 2622 | return _("Bad call to md_atof () - floating point formats are not supported"); |
| 2623 | } |
| 2624 | |
| 2625 | /* Turn a number as a fixS * into a series of bytes that represents the |
| 2626 | number on the target machine. The purpose of this procedure is the |
| 2627 | same as that of md_number_to_chars but this procedure is supposed to |
| 2628 | handle general bit field fixes and machine-dependent fixups. |
| 2629 | |
| 2630 | bufp Pointer to an array where the result should be stored. |
| 2631 | |
| 2632 | val The value to store. |
| 2633 | |
| 2634 | n The number of bytes in "val" that should be stored. |
| 2635 | |
| 2636 | fixP The fix to be applied to the bit field starting at bufp. |
| 2637 | |
| 2638 | seg The segment containing this number. */ |
| 2639 | |
| 2640 | static void |
| 2641 | cris_number_to_imm (bufp, val, n, fixP, seg) |
| 2642 | char *bufp; |
| 2643 | long val; |
| 2644 | int n; |
| 2645 | fixS *fixP; |
| 2646 | segT seg; |
| 2647 | { |
| 2648 | segT sym_seg; |
| 2649 | |
| 2650 | know (n <= 4); |
| 2651 | know (fixP); |
| 2652 | |
| 2653 | /* We put the relative "vma" for the other segment for inter-segment |
| 2654 | relocations in the object data to stay binary "compatible" (with an |
| 2655 | uninteresting old version) for the relocation. |
| 2656 | Maybe delete some day. */ |
| 2657 | if (fixP->fx_addsy |
| 2658 | && (sym_seg = S_GET_SEGMENT (fixP->fx_addsy)) != seg) |
| 2659 | val += sym_seg->vma; |
| 2660 | |
| 2661 | if (fixP->fx_addsy != NULL || fixP->fx_pcrel) |
| 2662 | switch (fixP->fx_r_type) |
| 2663 | { |
| 2664 | /* These must be fully resolved when getting here. */ |
| 2665 | case BFD_RELOC_32_PCREL: |
| 2666 | case BFD_RELOC_16_PCREL: |
| 2667 | case BFD_RELOC_8_PCREL: |
| 2668 | as_bad_where (fixP->fx_frag->fr_file, fixP->fx_frag->fr_line, |
| 2669 | _("PC-relative relocation must be trivially resolved")); |
| 2670 | default: |
| 2671 | ; |
| 2672 | } |
| 2673 | |
| 2674 | switch (fixP->fx_r_type) |
| 2675 | { |
| 2676 | /* Ditto here, we put the addend into the object code as |
| 2677 | well as the reloc addend. Keep it that way for now, to simplify |
| 2678 | regression tests on the object file contents. FIXME: Seems |
| 2679 | uninteresting now that we have a test suite. */ |
| 2680 | |
| 2681 | case BFD_RELOC_CRIS_16_GOT: |
| 2682 | case BFD_RELOC_CRIS_32_GOT: |
| 2683 | case BFD_RELOC_CRIS_32_GOTREL: |
| 2684 | case BFD_RELOC_CRIS_16_GOTPLT: |
| 2685 | case BFD_RELOC_CRIS_32_GOTPLT: |
| 2686 | case BFD_RELOC_CRIS_32_PLT_GOTREL: |
| 2687 | case BFD_RELOC_CRIS_32_PLT_PCREL: |
| 2688 | /* We don't want to put in any kind of non-zero bits in the data |
| 2689 | being relocated for these. */ |
| 2690 | break; |
| 2691 | |
| 2692 | case BFD_RELOC_32: |
| 2693 | case BFD_RELOC_32_PCREL: |
| 2694 | /* No use having warnings here, since most hosts have a 32-bit type |
| 2695 | for "long" (which will probably change soon, now that I wrote |
| 2696 | this). */ |
| 2697 | bufp[3] = (val >> 24) & 0xFF; |
| 2698 | bufp[2] = (val >> 16) & 0xFF; |
| 2699 | bufp[1] = (val >> 8) & 0xFF; |
| 2700 | bufp[0] = val & 0xFF; |
| 2701 | break; |
| 2702 | |
| 2703 | /* FIXME: The 16 and 8-bit cases should have a way to check |
| 2704 | whether a signed or unsigned (or any signedness) number is |
| 2705 | accepted. |
| 2706 | FIXME: Does the as_bad calls find the line number by themselves, |
| 2707 | or should we change them into as_bad_where? */ |
| 2708 | |
| 2709 | case BFD_RELOC_16: |
| 2710 | case BFD_RELOC_16_PCREL: |
| 2711 | if (val > 0xffff || val < -32768) |
| 2712 | as_bad (_("Value not in 16 bit range: %ld"), val); |
| 2713 | if (! fixP->fx_addsy) |
| 2714 | { |
| 2715 | bufp[1] = (val >> 8) & 0xFF; |
| 2716 | bufp[0] = val & 0xFF; |
| 2717 | } |
| 2718 | break; |
| 2719 | |
| 2720 | case BFD_RELOC_8: |
| 2721 | case BFD_RELOC_8_PCREL: |
| 2722 | if (val > 255 || val < -128) |
| 2723 | as_bad (_("Value not in 8 bit range: %ld"), val); |
| 2724 | if (! fixP->fx_addsy) |
| 2725 | bufp[0] = val & 0xFF; |
| 2726 | break; |
| 2727 | |
| 2728 | case BFD_RELOC_CRIS_UNSIGNED_4: |
| 2729 | if (val > 15 || val < 0) |
| 2730 | as_bad (_("Value not in 4 bit unsigned range: %ld"), val); |
| 2731 | if (! fixP->fx_addsy) |
| 2732 | bufp[0] |= val & 0x0F; |
| 2733 | break; |
| 2734 | |
| 2735 | case BFD_RELOC_CRIS_UNSIGNED_5: |
| 2736 | if (val > 31 || val < 0) |
| 2737 | as_bad (_("Value not in 5 bit unsigned range: %ld"), val); |
| 2738 | if (! fixP->fx_addsy) |
| 2739 | bufp[0] |= val & 0x1F; |
| 2740 | break; |
| 2741 | |
| 2742 | case BFD_RELOC_CRIS_SIGNED_6: |
| 2743 | if (val > 31 || val < -32) |
| 2744 | as_bad (_("Value not in 6 bit range: %ld"), val); |
| 2745 | if (! fixP->fx_addsy) |
| 2746 | bufp[0] |= val & 0x3F; |
| 2747 | break; |
| 2748 | |
| 2749 | case BFD_RELOC_CRIS_UNSIGNED_6: |
| 2750 | if (val > 63 || val < 0) |
| 2751 | as_bad (_("Value not in 6 bit unsigned range: %ld"), val); |
| 2752 | if (! fixP->fx_addsy) |
| 2753 | bufp[0] |= val & 0x3F; |
| 2754 | break; |
| 2755 | |
| 2756 | case BFD_RELOC_CRIS_BDISP8: |
| 2757 | if (! fixP->fx_addsy) |
| 2758 | bufp[0] = branch_disp (val); |
| 2759 | break; |
| 2760 | |
| 2761 | case BFD_RELOC_NONE: |
| 2762 | /* May actually happen automatically. For example at broken |
| 2763 | words, if the word turns out not to be broken. |
| 2764 | FIXME: When? Which testcase? */ |
| 2765 | if (! fixP->fx_addsy) |
| 2766 | md_number_to_chars (bufp, val, n); |
| 2767 | break; |
| 2768 | |
| 2769 | case BFD_RELOC_VTABLE_INHERIT: |
| 2770 | /* This borrowed from tc-ppc.c on a whim. */ |
| 2771 | if (fixP->fx_addsy |
| 2772 | && !S_IS_DEFINED (fixP->fx_addsy) |
| 2773 | && !S_IS_WEAK (fixP->fx_addsy)) |
| 2774 | S_SET_WEAK (fixP->fx_addsy); |
| 2775 | /* Fall through. */ |
| 2776 | |
| 2777 | case BFD_RELOC_VTABLE_ENTRY: |
| 2778 | fixP->fx_done = 0; |
| 2779 | break; |
| 2780 | |
| 2781 | default: |
| 2782 | BAD_CASE (fixP->fx_r_type); |
| 2783 | } |
| 2784 | } |
| 2785 | |
| 2786 | /* Processes machine-dependent command line options. Called once for |
| 2787 | each option on the command line that the machine-independent part of |
| 2788 | GAS does not understand. */ |
| 2789 | |
| 2790 | int |
| 2791 | md_parse_option (arg, argp) |
| 2792 | int arg; |
| 2793 | char *argp ATTRIBUTE_UNUSED; |
| 2794 | { |
| 2795 | switch (arg) |
| 2796 | { |
| 2797 | case 'H': |
| 2798 | case 'h': |
| 2799 | printf (_("Please use --help to see usage and options for this assembler.\n")); |
| 2800 | md_show_usage (stdout); |
| 2801 | exit (EXIT_SUCCESS); |
| 2802 | |
| 2803 | case 'N': |
| 2804 | warn_for_branch_expansion = 1; |
| 2805 | return 1; |
| 2806 | |
| 2807 | case OPTION_NO_US: |
| 2808 | demand_register_prefix = true; |
| 2809 | |
| 2810 | if (OUTPUT_FLAVOR == bfd_target_aout_flavour) |
| 2811 | as_bad (_("--no-underscore is invalid with a.out format")); |
| 2812 | else |
| 2813 | symbols_have_leading_underscore = false; |
| 2814 | return 1; |
| 2815 | |
| 2816 | case OPTION_US: |
| 2817 | demand_register_prefix = false; |
| 2818 | symbols_have_leading_underscore = true; |
| 2819 | return 1; |
| 2820 | |
| 2821 | case OPTION_PIC: |
| 2822 | pic = true; |
| 2823 | return 1; |
| 2824 | |
| 2825 | default: |
| 2826 | return 0; |
| 2827 | } |
| 2828 | } |
| 2829 | |
| 2830 | /* Round up a section size to the appropriate boundary. */ |
| 2831 | valueT |
| 2832 | md_section_align (segment, size) |
| 2833 | segT segment; |
| 2834 | valueT size; |
| 2835 | { |
| 2836 | /* Round all sects to multiple of 4, except the bss section, which |
| 2837 | we'll round to word-size. |
| 2838 | |
| 2839 | FIXME: Check if this really matters. All sections should be |
| 2840 | rounded up, and all sections should (optionally) be assumed to be |
| 2841 | dword-aligned, it's just that there is actual usage of linking to a |
| 2842 | multiple of two. */ |
| 2843 | if (OUTPUT_FLAVOR == bfd_target_aout_flavour) |
| 2844 | { |
| 2845 | if (segment == bss_section) |
| 2846 | return (size + 1) & ~1; |
| 2847 | return (size + 3) & ~3; |
| 2848 | } |
| 2849 | else |
| 2850 | { |
| 2851 | /* FIXME: Is this wanted? It matches the testsuite, but that's not |
| 2852 | really a valid reason. */ |
| 2853 | if (segment == text_section) |
| 2854 | return (size + 3) & ~3; |
| 2855 | } |
| 2856 | |
| 2857 | return size; |
| 2858 | } |
| 2859 | |
| 2860 | /* Generate a machine-dependent relocation. */ |
| 2861 | arelent * |
| 2862 | tc_gen_reloc (section, fixP) |
| 2863 | asection *section ATTRIBUTE_UNUSED; |
| 2864 | fixS *fixP; |
| 2865 | { |
| 2866 | arelent *relP; |
| 2867 | bfd_reloc_code_real_type code; |
| 2868 | |
| 2869 | switch (fixP->fx_r_type) |
| 2870 | { |
| 2871 | case BFD_RELOC_CRIS_16_GOT: |
| 2872 | case BFD_RELOC_CRIS_32_GOT: |
| 2873 | case BFD_RELOC_CRIS_16_GOTPLT: |
| 2874 | case BFD_RELOC_CRIS_32_GOTPLT: |
| 2875 | case BFD_RELOC_CRIS_32_GOTREL: |
| 2876 | case BFD_RELOC_CRIS_32_PLT_GOTREL: |
| 2877 | case BFD_RELOC_CRIS_32_PLT_PCREL: |
| 2878 | case BFD_RELOC_32: |
| 2879 | case BFD_RELOC_16: |
| 2880 | case BFD_RELOC_8: |
| 2881 | case BFD_RELOC_VTABLE_INHERIT: |
| 2882 | case BFD_RELOC_VTABLE_ENTRY: |
| 2883 | code = fixP->fx_r_type; |
| 2884 | break; |
| 2885 | default: |
| 2886 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 2887 | _("Semantics error. This type of operand can not be relocated, it must be an assembly-time constant")); |
| 2888 | return 0; |
| 2889 | } |
| 2890 | |
| 2891 | relP = (arelent *) xmalloc (sizeof (arelent)); |
| 2892 | assert (relP != 0); |
| 2893 | relP->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); |
| 2894 | *relP->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); |
| 2895 | relP->address = fixP->fx_frag->fr_address + fixP->fx_where; |
| 2896 | |
| 2897 | if (fixP->fx_pcrel) |
| 2898 | /* FIXME: Is this correct? */ |
| 2899 | relP->addend = fixP->fx_addnumber; |
| 2900 | else |
| 2901 | /* At least *this one* is correct. */ |
| 2902 | relP->addend = fixP->fx_offset; |
| 2903 | |
| 2904 | /* This is the standard place for KLUDGEs to work around bugs in |
| 2905 | bfd_install_relocation (first such note in the documentation |
| 2906 | appears with binutils-2.8). |
| 2907 | |
| 2908 | That function bfd_install_relocation does the wrong thing with |
| 2909 | putting stuff into the addend of a reloc (it should stay out) for a |
| 2910 | weak symbol. The really bad thing is that it adds the |
| 2911 | "segment-relative offset" of the symbol into the reloc. In this |
| 2912 | case, the reloc should instead be relative to the symbol with no |
| 2913 | other offset than the assembly code shows; and since the symbol is |
| 2914 | weak, any local definition should be ignored until link time (or |
| 2915 | thereafter). |
| 2916 | To wit: weaksym+42 should be weaksym+42 in the reloc, |
| 2917 | not weaksym+(offset_from_segment_of_local_weaksym_definition) |
| 2918 | |
| 2919 | To "work around" this, we subtract the segment-relative offset of |
| 2920 | "known" weak symbols. This evens out the extra offset. |
| 2921 | |
| 2922 | That happens for a.out but not for ELF, since for ELF, |
| 2923 | bfd_install_relocation uses the "special function" field of the |
| 2924 | howto, and does not execute the code that needs to be undone. */ |
| 2925 | |
| 2926 | if (OUTPUT_FLAVOR == bfd_target_aout_flavour |
| 2927 | && fixP->fx_addsy && S_IS_WEAK (fixP->fx_addsy) |
| 2928 | && ! bfd_is_und_section (S_GET_SEGMENT (fixP->fx_addsy))) |
| 2929 | { |
| 2930 | relP->addend -= S_GET_VALUE (fixP->fx_addsy); |
| 2931 | } |
| 2932 | |
| 2933 | relP->howto = bfd_reloc_type_lookup (stdoutput, code); |
| 2934 | if (! relP->howto) |
| 2935 | { |
| 2936 | const char *name; |
| 2937 | |
| 2938 | name = S_GET_NAME (fixP->fx_addsy); |
| 2939 | if (name == NULL) |
| 2940 | name = _("<unknown>"); |
| 2941 | as_fatal (_("Cannot generate relocation type for symbol %s, code %s"), |
| 2942 | name, bfd_get_reloc_code_name (code)); |
| 2943 | } |
| 2944 | |
| 2945 | return relP; |
| 2946 | } |
| 2947 | |
| 2948 | /* Machine-dependent usage-output. */ |
| 2949 | |
| 2950 | void |
| 2951 | md_show_usage (stream) |
| 2952 | FILE *stream; |
| 2953 | { |
| 2954 | /* The messages are formatted to line up with the generic options. */ |
| 2955 | fprintf (stream, _("CRIS-specific options:\n")); |
| 2956 | fprintf (stream, "%s", |
| 2957 | _(" -h, -H Don't execute, print this help text. Deprecated.\n")); |
| 2958 | fprintf (stream, "%s", |
| 2959 | _(" -N Warn when branches are expanded to jumps.\n")); |
| 2960 | fprintf (stream, "%s", |
| 2961 | _(" --underscore User symbols are normally prepended with underscore.\n")); |
| 2962 | fprintf (stream, "%s", |
| 2963 | _(" Registers will not need any prefix.\n")); |
| 2964 | fprintf (stream, "%s", |
| 2965 | _(" --no-underscore User symbols do not have any prefix.\n")); |
| 2966 | fprintf (stream, "%s", |
| 2967 | _(" Registers will require a `$'-prefix.\n")); |
| 2968 | fprintf (stream, "%s", |
| 2969 | _(" --pic Enable generation of position-independent code.\n")); |
| 2970 | } |
| 2971 | |
| 2972 | /* Apply a fixS (fixup of an instruction or data that we didn't have |
| 2973 | enough info to complete immediately) to the data in a frag. */ |
| 2974 | |
| 2975 | int |
| 2976 | md_apply_fix3 (fixP, valP, seg) |
| 2977 | fixS *fixP; |
| 2978 | valueT *valP; |
| 2979 | segT seg; |
| 2980 | { |
| 2981 | long val = *valP; |
| 2982 | |
| 2983 | char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; |
| 2984 | |
| 2985 | if (fixP->fx_addsy == 0 && !fixP->fx_pcrel) |
| 2986 | fixP->fx_done = 1; |
| 2987 | |
| 2988 | if (fixP->fx_bit_fixP || fixP->fx_im_disp != 0) |
| 2989 | { |
| 2990 | as_bad_where (fixP->fx_file, fixP->fx_line, _("Invalid relocation")); |
| 2991 | fixP->fx_done = 1; |
| 2992 | } |
| 2993 | else |
| 2994 | { |
| 2995 | /* I took this from tc-arc.c, since we used to not support |
| 2996 | fx_subsy != NULL. I'm not totally sure it's TRT. */ |
| 2997 | if (fixP->fx_subsy != (symbolS *) NULL) |
| 2998 | { |
| 2999 | if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section) |
| 3000 | val -= S_GET_VALUE (fixP->fx_subsy); |
| 3001 | else |
| 3002 | { |
| 3003 | /* We can't actually support subtracting a symbol. */ |
| 3004 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 3005 | _("expression too complex")); |
| 3006 | } |
| 3007 | } |
| 3008 | |
| 3009 | cris_number_to_imm (buf, val, fixP->fx_size, fixP, seg); |
| 3010 | } |
| 3011 | |
| 3012 | return 1; |
| 3013 | } |
| 3014 | |
| 3015 | /* All relocations are relative to the location just after the fixup; |
| 3016 | the address of the fixup plus its size. */ |
| 3017 | |
| 3018 | long |
| 3019 | md_pcrel_from (fixP) |
| 3020 | fixS *fixP; |
| 3021 | { |
| 3022 | valueT addr = fixP->fx_where + fixP->fx_frag->fr_address; |
| 3023 | |
| 3024 | /* FIXME: We get here only at the end of assembly, when X in ".-X" is |
| 3025 | still unknown. Since we don't have pc-relative relocations in a.out, |
| 3026 | this is invalid. What to do if anything for a.out, is to add |
| 3027 | pc-relative relocations everywhere including the elinux program |
| 3028 | loader. For ELF, allow straight-forward PC-relative relocations, |
| 3029 | which are always relative to the location after the relocation. */ |
| 3030 | if (OUTPUT_FLAVOR != bfd_target_elf_flavour |
| 3031 | || (fixP->fx_r_type != BFD_RELOC_8_PCREL |
| 3032 | && fixP->fx_r_type != BFD_RELOC_16_PCREL |
| 3033 | && fixP->fx_r_type != BFD_RELOC_32_PCREL)) |
| 3034 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 3035 | _("Invalid pc-relative relocation")); |
| 3036 | return fixP->fx_size + addr; |
| 3037 | } |
| 3038 | |
| 3039 | /* We have no need to give defaults for symbol-values. */ |
| 3040 | symbolS * |
| 3041 | md_undefined_symbol (name) |
| 3042 | char *name ATTRIBUTE_UNUSED; |
| 3043 | { |
| 3044 | return 0; |
| 3045 | } |
| 3046 | |
| 3047 | /* Definition of TC_FORCE_RELOCATION. |
| 3048 | FIXME: Unsure of this. Can we omit it? Just copied from tc-i386.c |
| 3049 | when doing multi-object format with ELF, since it's the only other |
| 3050 | multi-object-format target with a.out and ELF. */ |
| 3051 | int |
| 3052 | md_cris_force_relocation (fixp) |
| 3053 | struct fix *fixp; |
| 3054 | { |
| 3055 | switch (fixp->fx_r_type) |
| 3056 | { |
| 3057 | case BFD_RELOC_VTABLE_INHERIT: |
| 3058 | case BFD_RELOC_VTABLE_ENTRY: |
| 3059 | case BFD_RELOC_CRIS_16_GOT: |
| 3060 | case BFD_RELOC_CRIS_32_GOT: |
| 3061 | case BFD_RELOC_CRIS_16_GOTPLT: |
| 3062 | case BFD_RELOC_CRIS_32_GOTPLT: |
| 3063 | case BFD_RELOC_CRIS_32_GOTREL: |
| 3064 | case BFD_RELOC_CRIS_32_PLT_GOTREL: |
| 3065 | case BFD_RELOC_CRIS_32_PLT_PCREL: |
| 3066 | return 1; |
| 3067 | default: |
| 3068 | ; |
| 3069 | } |
| 3070 | |
| 3071 | return 0; |
| 3072 | } |
| 3073 | |
| 3074 | /* Check and emit error if broken-word handling has failed to fix up a |
| 3075 | case-table. This is called from write.c, after doing everything it |
| 3076 | knows about how to handle broken words. */ |
| 3077 | |
| 3078 | void |
| 3079 | tc_cris_check_adjusted_broken_word (new_offset, brokwP) |
| 3080 | offsetT new_offset; |
| 3081 | struct broken_word *brokwP; |
| 3082 | { |
| 3083 | if (new_offset > 32767 || new_offset < -32768) |
| 3084 | /* We really want a genuine error, not a warning, so make it one. */ |
| 3085 | as_bad_where (brokwP->frag->fr_file, brokwP->frag->fr_line, |
| 3086 | _("Adjusted signed .word (%ld) overflows: `switch'-statement too large."), |
| 3087 | (long) new_offset); |
| 3088 | } |
| 3089 | |
| 3090 | /* Make a leading REGISTER_PREFIX_CHAR mandatory for all registers. */ |
| 3091 | |
| 3092 | static void cris_force_reg_prefix () |
| 3093 | { |
| 3094 | demand_register_prefix = true; |
| 3095 | } |
| 3096 | |
| 3097 | /* Do not demand a leading REGISTER_PREFIX_CHAR for all registers. */ |
| 3098 | |
| 3099 | static void cris_relax_reg_prefix () |
| 3100 | { |
| 3101 | demand_register_prefix = false; |
| 3102 | } |
| 3103 | |
| 3104 | /* Adjust for having a leading '_' on all user symbols. */ |
| 3105 | |
| 3106 | static void cris_sym_leading_underscore () |
| 3107 | { |
| 3108 | /* We can't really do anything more than assert that what the program |
| 3109 | thinks symbol starts with agrees with the command-line options, since |
| 3110 | the bfd is already created. */ |
| 3111 | |
| 3112 | if (symbols_have_leading_underscore == false) |
| 3113 | as_bad (_(".syntax %s requires command-line option `--underscore'"), |
| 3114 | SYNTAX_USER_SYM_LEADING_UNDERSCORE); |
| 3115 | } |
| 3116 | |
| 3117 | /* Adjust for not having any particular prefix on user symbols. */ |
| 3118 | |
| 3119 | static void cris_sym_no_leading_underscore () |
| 3120 | { |
| 3121 | if (symbols_have_leading_underscore == true) |
| 3122 | as_bad (_(".syntax %s requires command-line option `--no-underscore'"), |
| 3123 | SYNTAX_USER_SYM_NO_LEADING_UNDERSCORE); |
| 3124 | } |
| 3125 | |
| 3126 | /* Handle the .syntax pseudo, which takes an argument that decides what |
| 3127 | syntax the assembly code has. */ |
| 3128 | |
| 3129 | static void |
| 3130 | s_syntax (ignore) |
| 3131 | int ignore ATTRIBUTE_UNUSED; |
| 3132 | { |
| 3133 | static const struct syntaxes |
| 3134 | { |
| 3135 | const char *operand; |
| 3136 | void (*fn) PARAMS ((void)); |
| 3137 | } syntax_table[] = |
| 3138 | {{SYNTAX_ENFORCE_REG_PREFIX, cris_force_reg_prefix}, |
| 3139 | {SYNTAX_RELAX_REG_PREFIX, cris_relax_reg_prefix}, |
| 3140 | {SYNTAX_USER_SYM_LEADING_UNDERSCORE, cris_sym_leading_underscore}, |
| 3141 | {SYNTAX_USER_SYM_NO_LEADING_UNDERSCORE, cris_sym_no_leading_underscore}}; |
| 3142 | |
| 3143 | const struct syntaxes *sp; |
| 3144 | |
| 3145 | for (sp = syntax_table; |
| 3146 | sp < syntax_table + sizeof (syntax_table) / sizeof (syntax_table[0]); |
| 3147 | sp++) |
| 3148 | { |
| 3149 | if (strncmp (input_line_pointer, sp->operand, |
| 3150 | strlen (sp->operand)) == 0) |
| 3151 | { |
| 3152 | (sp->fn) (); |
| 3153 | |
| 3154 | input_line_pointer += strlen (sp->operand); |
| 3155 | demand_empty_rest_of_line (); |
| 3156 | return; |
| 3157 | } |
| 3158 | } |
| 3159 | |
| 3160 | as_bad (_("Unknown .syntax operand")); |
| 3161 | } |
| 3162 | |
| 3163 | /* Wrapper for dwarf2_directive_file to emit error if this is seen when |
| 3164 | not emitting ELF. */ |
| 3165 | |
| 3166 | static void |
| 3167 | s_cris_file (dummy) |
| 3168 | int dummy; |
| 3169 | { |
| 3170 | if (OUTPUT_FLAVOR != bfd_target_elf_flavour) |
| 3171 | as_bad (_("Pseudodirective .file is only valid when generating ELF")); |
| 3172 | else |
| 3173 | dwarf2_directive_file (dummy); |
| 3174 | } |
| 3175 | |
| 3176 | /* Wrapper for dwarf2_directive_loc to emit error if this is seen when not |
| 3177 | emitting ELF. */ |
| 3178 | |
| 3179 | static void |
| 3180 | s_cris_loc (dummy) |
| 3181 | int dummy; |
| 3182 | { |
| 3183 | if (OUTPUT_FLAVOR != bfd_target_elf_flavour) |
| 3184 | as_bad (_("Pseudodirective .loc is only valid when generating ELF")); |
| 3185 | else |
| 3186 | dwarf2_directive_loc (dummy); |
| 3187 | } |
| 3188 | |
| 3189 | /* |
| 3190 | * Local variables: |
| 3191 | * eval: (c-set-style "gnu") |
| 3192 | * indent-tabs-mode: t |
| 3193 | * End: |
| 3194 | */ |