gcc/config/lm32/lm32.h

   1 /* Definitions of target machine for GNU compiler, Lattice Mico32 architecture.
   2    Contributed by Jon Beniston <jon@beniston.com>
   3
   4    Copyright (C) 2009-2014 Free Software Foundation, Inc.
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 3, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GCC; see the file COPYING3.  If not see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 /*-------------------------------*/
  23 /* Run-time Target Specification */
  24 /*-------------------------------*/
  25
  26 /* Target CPU builtins.  */
  27 #define TARGET_CPU_CPP_BUILTINS()                       \
  28   do                                                    \
  29     {                                                   \
  30       builtin_define ("__lm32__");                      \
  31       builtin_assert ("cpu=lm32");                      \
  32       builtin_assert ("machine=lm32");                  \
  33       if (TARGET_MULTIPLY_ENABLED)                      \
  34         builtin_define ("__multiply_enabled__");        \
  35       if (TARGET_DIVIDE_ENABLED)                        \
  36         builtin_define ("__divide_enabled__");          \
  37       if (TARGET_BARREL_SHIFT_ENABLED)                  \
  38         builtin_define ("__barrel_shift_enabled__");    \
  39       if (TARGET_SIGN_EXTEND_ENABLED)                   \
  40         builtin_define ("__sign_extend_enabled__");     \
  41       if (TARGET_USER_ENABLED)                          \
  42         builtin_define ("__user_enabled__");            \
  43     }                                                   \
  44   while (0)
  45
  46 #undef  ASM_SPEC
  47 #define ASM_SPEC "\
  48 %{mmultiply-enabled} \
  49 %{mdivide-enabled} \
  50 %{mbarrel-shift-enabled} \
  51 %{msign-extend-enabled} \
  52 %{muser-enabled} \
  53 "
  54
  55 /* Let link script define all link options.
  56    Default to using simulator link script.  */
  57
  58 #undef  STARTFILE_SPEC
  59 #define STARTFILE_SPEC ""
  60 #undef  ENDFILE_SPEC
  61 #define ENDFILE_SPEC ""
  62 #undef  LIB_SPEC
  63 #define LIB_SPEC "%{!T*:-T sim.ld}"
  64
  65 #undef  CC1_SPEC
  66 #define CC1_SPEC "%{G*}"
  67
  68 /*---------------------------------*/
  69 /* Target machine storage layout.  */
  70 /*---------------------------------*/
  71
  72 #define BITS_BIG_ENDIAN 0
  73 #define BYTES_BIG_ENDIAN 1
  74 #define WORDS_BIG_ENDIAN 1
  75
  76 #define BITS_PER_WORD 32
  77 #define UNITS_PER_WORD 4
  78
  79 #define POINTER_SIZE 32
  80
  81 #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)               \
  82 do {                                                    \
  83   if (GET_MODE_CLASS (MODE) == MODE_INT                 \
  84       && GET_MODE_SIZE (MODE) < UNITS_PER_WORD)         \
  85     (MODE) = word_mode;                                 \
  86 } while (0)
  87
  88 #define PARM_BOUNDARY 32
  89
  90 #define STACK_BOUNDARY 32
  91
  92 #define BIGGEST_ALIGNMENT 64
  93
  94 #define FUNCTION_BOUNDARY  32
  95
  96 #define EMPTY_FIELD_BOUNDARY 32
  97
  98 #define STRICT_ALIGNMENT 1
  99
 100 #define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT
 101
 102 /* Make strings word-aligned so strcpy from constants will be faster.  */
 103 #define CONSTANT_ALIGNMENT(EXP, ALIGN)  \
 104   (TREE_CODE (EXP) == STRING_CST        \
 105    && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
 106
 107 /* Make arrays and structures word-aligned to allow faster copying etc.  */
 108 #define DATA_ALIGNMENT(TYPE, ALIGN)                                     \
 109   ((((ALIGN) < BITS_PER_WORD)                                           \
 110     && (TREE_CODE (TYPE) == ARRAY_TYPE                                  \
 111         || TREE_CODE (TYPE) == UNION_TYPE                               \
 112         || TREE_CODE (TYPE) == RECORD_TYPE)) ? BITS_PER_WORD : (ALIGN))
 113
 114 /* We need this for the same reason as DATA_ALIGNMENT, namely to cause
 115    character arrays to be word-aligned so that `strcpy' calls that copy
 116    constants to character arrays can be done inline, and 'strcmp' can be
 117    optimised to use word loads.  */
 118 #define LOCAL_ALIGNMENT(TYPE, ALIGN) \
 119   DATA_ALIGNMENT (TYPE, ALIGN)
 120
 121 /*----------------------------------------*/
 122 /* Layout of source language data types.  */
 123 /*----------------------------------------*/
 124
 125 #define INT_TYPE_SIZE               32
 126 #define SHORT_TYPE_SIZE             16
 127 #define LONG_TYPE_SIZE              32
 128 #define LONG_LONG_TYPE_SIZE         64
 129
 130 #define FLOAT_TYPE_SIZE             32
 131 #define DOUBLE_TYPE_SIZE            64
 132 #define LONG_DOUBLE_TYPE_SIZE       64
 133
 134 #define DEFAULT_SIGNED_CHAR         0
 135
 136 #define SIZE_TYPE "unsigned int"
 137
 138 #define PTRDIFF_TYPE "int"
 139
 140 /*---------------------------*/
 141 /* Standard register usage.  */
 142 /*---------------------------*/
 143
 144 #define FIRST_PSEUDO_REGISTER  32
 145
 146 #define RV_REGNUM   1
 147 #define GP_REGNUM   26
 148 #define FP_REGNUM   27
 149 #define SP_REGNUM   28
 150 #define RA_REGNUM   29
 151
 152 #define G_REG_P(X)      ((X)<32)
 153
 154 #define FIXED_REGISTERS   \
 155 { 1, 0, 0, 0, 0, 0, 0, 0, \
 156   0, 0, 0, 0, 0, 0, 0, 0, \
 157   0, 0, 0, 0, 0, 0, 0, 0, \
 158   0, 0, 1, 0, 1, 0, 1, 1}
 159
 160 #define CALL_USED_REGISTERS \
 161 { 1, 1, 1, 1, 1, 1, 1, 1,   \
 162   1, 1, 1, 0, 0, 0, 0, 0,   \
 163   0, 0, 0, 0, 0, 0, 0, 0,   \
 164   0, 0, 1, 0, 1, 0, 1, 1}
 165
 166 #define HARD_REGNO_NREGS(REGNO, MODE)                                   \
 167     ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 168
 169 #define HARD_REGNO_MODE_OK(REGNO, MODE) G_REG_P(REGNO)
 170
 171 #define MODES_TIEABLE_P(MODE1, MODE2)           \
 172 (      GET_MODE_CLASS (MODE1) == MODE_INT               \
 173     && GET_MODE_CLASS (MODE2) == MODE_INT               \
 174     && GET_MODE_SIZE (MODE1) <= UNITS_PER_WORD  \
 175     && GET_MODE_SIZE (MODE2) <= UNITS_PER_WORD)
 176
 177 #define AVOID_CCMODE_COPIES
 178
 179 /*----------------------------------*/
 180 /* Register classes and constants.  */
 181 /*----------------------------------*/
 182
 183 enum reg_class
 184 {
 185   NO_REGS,
 186   GENERAL_REGS,
 187   ALL_REGS,
 188   LIM_REG_CLASSES
 189 };
 190
 191 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 192
 193 #define REG_CLASS_NAMES { "NO_REGS", "GENERAL_REGS", "ALL_REGS" }
 194
 195 #define REG_CLASS_CONTENTS      \
 196 { {0x00000000},                 \
 197   {0xffffffff},                 \
 198   {0xffffffff}                  \
 199 }
 200
 201 #define REGNO_REG_CLASS(REGNO) \
 202     (G_REG_P(REGNO) ? GENERAL_REGS : NO_REGS)
 203
 204 #define INDEX_REG_CLASS NO_REGS
 205
 206 #define BASE_REG_CLASS GENERAL_REGS
 207
 208 #define REGNO_OK_FOR_BASE_P(REGNO) \
 209     (G_REG_P (REGNO) || G_REG_P ((unsigned) reg_renumber[REGNO]))
 210
 211 #define REGNO_OK_FOR_INDEX_P(REGNO) 0
 212
 213 /*----------------------------------------*/
 214 /* Stack Layout and Calling Conventions.  */
 215 /*----------------------------------------*/
 216
 217 #define STACK_GROWS_DOWNWARD 1
 218
 219 #define FRAME_GROWS_DOWNWARD 1
 220
 221 #define STACK_POINTER_OFFSET (UNITS_PER_WORD)
 222
 223 #define STARTING_FRAME_OFFSET (UNITS_PER_WORD)
 224
 225 #define FIRST_PARM_OFFSET(FNDECL) (UNITS_PER_WORD)
 226
 227 #define STACK_POINTER_REGNUM SP_REGNUM
 228
 229 #define FRAME_POINTER_REGNUM FP_REGNUM
 230
 231 #define ARG_POINTER_REGNUM FRAME_POINTER_REGNUM
 232
 233 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (SImode, RA_REGNUM)
 234
 235 #define RETURN_ADDR_RTX(count, frame)                                   \
 236   lm32_return_addr_rtx (count, frame)
 237
 238 /* FIXME - This is not yet supported.  */
 239 #define STATIC_CHAIN_REGNUM 9
 240
 241 #define ELIMINABLE_REGS \
 242 {{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM },                        \
 243  { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM },                          \
 244 }
 245
 246 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 247   (OFFSET) = lm32_compute_initial_elimination_offset (FROM, TO)
 248
 249 /*-----------------------------*/
 250 /* Function argument passing.  */
 251 /*-----------------------------*/
 252
 253 #define ACCUMULATE_OUTGOING_ARGS 1
 254
 255 /*--------------------------------*/
 256 /* Passing Arguments in Registers */
 257 /*--------------------------------*/
 258
 259 /* The first argument register.  */
 260 #define LM32_FIRST_ARG_REG 1
 261
 262 /* The number of (integer) argument register available.  */
 263 #define LM32_NUM_ARG_REGS 8
 264
 265 #define CUMULATIVE_ARGS int
 266
 267 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,INDIRECT,N_NAMED_ARGS)  \
 268   (CUM) = 0
 269
 270 #define FUNCTION_ARG_REGNO_P(r)                                         \
 271   (((r) >= LM32_FIRST_ARG_REG) && ((r) <= LM32_NUM_ARG_REGS))
 272
 273 /*--------------------*/
 274 /* Function results.  */
 275 /*--------------------*/
 276
 277 #define FUNCTION_VALUE(VALTYPE, FUNC)                                   \
 278    gen_rtx_REG ((INTEGRAL_TYPE_P (VALTYPE)                              \
 279                  && TYPE_PRECISION (VALTYPE) < BITS_PER_WORD)           \
 280                     ? word_mode                                         \
 281                     : TYPE_MODE (VALTYPE),                              \
 282                     RV_REGNUM)
 283
 284 #define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, RV_REGNUM)
 285
 286 #define FUNCTION_VALUE_REGNO_P(N) ((N) == RV_REGNUM)
 287
 288 #define RETURN_IN_MEMORY(TYPE) lm32_return_in_memory (TYPE)
 289
 290 #define DEFAULT_PCC_STRUCT_RETURN 0
 291
 292 /* Convert from bytes to ints.  */
 293 #define LM32_NUM_INTS(X) (((X) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 294
 295 /* The number of (integer) registers required to hold a quantity of
 296    type MODE.  */
 297 #define LM32_NUM_REGS(MODE) LM32_NUM_INTS (GET_MODE_SIZE (MODE))
 298
 299 /* The number of (integer) registers required to hold a quantity of
 300    TYPE MODE.  */
 301 #define LM32_NUM_REGS2(MODE, TYPE)                       \
 302   LM32_NUM_INTS ((MODE) == BLKmode ?                     \
 303   int_size_in_bytes (TYPE) : GET_MODE_SIZE (MODE))
 304
 305 #define STRUCT_VALUE 0
 306
 307 /*---------------------------*/
 308 /* Function entry and exit.  */
 309 /*---------------------------*/
 310
 311 /*-------------*/
 312 /* Profiling.  */
 313 /*-------------*/
 314
 315 #define FUNCTION_PROFILER(FILE, LABELNO)
 316
 317 /*---------------*/
 318 /* Trampolines.  */
 319 /*---------------*/
 320
 321 #define TRAMPOLINE_SIZE         0
 322
 323 /*---------------------*/
 324 /*  Addressing Modes.  */
 325 /*---------------------*/
 326
 327 #define CONSTANT_ADDRESS_P(X)                                           \
 328   ((GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF             \
 329     || GET_CODE (X) == CONST_INT || GET_CODE (X) == HIGH                \
 330     || (GET_CODE (X) == CONST)))
 331
 332 #define MAX_REGS_PER_ADDRESS 1
 333
 334 #define STRICT_REG_OK_FOR_BASE_P(X)                                     \
 335   (REGNO_OK_FOR_BASE_P (REGNO (X)))
 336 #define NONSTRICT_REG_OK_FOR_BASE_P(X)                                  \
 337   (G_REG_P (REGNO (X)) || !HARD_REGISTER_NUM_P (REGNO (X)))
 338
 339 #ifdef REG_OK_STRICT
 340 #define REG_OK_FOR_BASE_P(X) STRICT_REG_OK_FOR_BASE_P(X)
 341 #else
 342 #define REG_OK_FOR_BASE_P(X) NONSTRICT_REG_OK_FOR_BASE_P(X)
 343 #endif
 344
 345 /*-------------------------*/
 346 /* Condition Code Status.  */
 347 /*-------------------------*/
 348
 349 #define REVERSIBLE_CC_MODE(MODE) 1
 350
 351 /*---------*/
 352 /* Costs.  */
 353 /*---------*/
 354
 355 #define SLOW_BYTE_ACCESS 1
 356
 357 #define NO_FUNCTION_CSE
 358
 359 #define BRANCH_COST(speed_p, predictable_p) 4
 360
 361 #define MOVE_RATIO(speed) (speed ? 24 : 3)
 362
 363 /*------------*/
 364 /* Sections.  */
 365 /*------------*/
 366
 367 #define TEXT_SECTION_ASM_OP             "\t.section\t.text"
 368 #define DATA_SECTION_ASM_OP             "\t.section\t.data"
 369 #define SDATA_SECTION_ASM_OP            "\t.section\t.sdata,\"aw\""
 370 #define BSS_SECTION_ASM_OP              "\t.section\t.bss"
 371 #define SBSS_SECTION_ASM_OP             "\t.section\t.sbss,\"aw\""
 372
 373 /*-------*/
 374 /* PIC.  */
 375 /*-------*/
 376
 377 #define PIC_OFFSET_TABLE_REGNUM (flag_pic ? GP_REGNUM : INVALID_REGNUM)
 378
 379 #define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)
 380
 381 #define LEGITIMATE_PIC_OPERAND_P(X)                                    \
 382         (!(nonpic_symbol_mentioned_p (X)))
 383
 384 /*-------------*/
 385 /* Assembler.  */
 386 /*-------------*/
 387
 388 #define ASM_COMMENT_START "#"
 389
 390 #define ASM_APP_ON "#APP\n"
 391
 392 #define ASM_APP_OFF "#NO_APP\n"
 393
 394 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 395  do {                                                                   \
 396         fputc ( '\t', FILE);                                            \
 397         assemble_name (FILE, LABEL1);                                   \
 398         fputs ( " = ", FILE);                                           \
 399         assemble_name (FILE, LABEL2);                                   \
 400         fputc ( '\n', FILE);                                            \
 401  } while (0)
 402
 403 /* Override default implementation in elfos.h to support -G.  */
 404 #undef  ASM_OUTPUT_ALIGNED_LOCAL
 405 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)               \
 406 do {                                                                    \
 407   if ((SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value)                \
 408     switch_to_section (sbss_section);                                   \
 409   else                                                                  \
 410     switch_to_section (bss_section);                                    \
 411   ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");                     \
 412   if (!flag_inhibit_size_directive)                                     \
 413     ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE);                       \
 414   ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT));       \
 415   ASM_OUTPUT_LABEL(FILE, NAME);                                         \
 416   ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1);                         \
 417 } while (0)
 418
 419 /* Override default implementation in elfos.h to support -G.  */
 420 #undef  ASM_OUTPUT_ALIGNED_COMMON
 421 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 422 do                                                                      \
 423 {                                                                       \
 424   if ((SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value)                \
 425     {                                                                   \
 426       switch_to_section (sbss_section);                                 \
 427       (*targetm.asm_out.globalize_label) (FILE, NAME);                  \
 428       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");                 \
 429       if (!flag_inhibit_size_directive)                                 \
 430         ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE);                   \
 431       ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT));   \
 432       ASM_OUTPUT_LABEL(FILE, NAME);                                     \
 433       ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1);                     \
 434     }                                                                   \
 435   else                                                                  \
 436     {                                                                   \
 437       switch_to_section (bss_section);                                  \
 438       fprintf ((FILE), "%s", COMMON_ASM_OP);                            \
 439       assemble_name ((FILE), (NAME));                                   \
 440       fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n",          \
 441                (SIZE), (ALIGN) / BITS_PER_UNIT);                        \
 442     }                                                                   \
 443 }                                                                       \
 444 while (0)
 445
 446 #define ASM_OUTPUT_LABEL(FILE, NAME) \
 447   do { assemble_name (FILE, NAME); fputs (":\n", FILE); } while (0)
 448
 449 #define ASM_OUTPUT_LABELREF(FILE,NAME)  \
 450   do {                                  \
 451     const char *xname = (NAME);         \
 452     if (xname[0] == '@')                \
 453       xname += 1;                       \
 454     if (xname[0] == '*')                \
 455       xname += 1;                       \
 456     fputs (xname, FILE);                \
 457   } while (0)
 458
 459 #define ASM_OUTPUT_SYMBOL_REF(STREAM, SYMBOL)                           \
 460   do {                                                                  \
 461     assemble_name (STREAM, XSTR (SYMBOL, 0));                           \
 462   } while (0)
 463
 464 #define GLOBAL_ASM_OP "\t.global\t"
 465
 466 #define REGISTER_NAMES                                          \
 467 {                                                               \
 468  "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",         \
 469  "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",        \
 470  "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",        \
 471  "r24", "r25",  "gp",  "fp",  "sp",  "ra",  "ea",  "ba"}
 472
 473 #define PRINT_OPERAND_PUNCT_VALID_P(CHAR) \
 474   (((CHAR) == '&') || ((CHAR) == '@') || ((CHAR) == '*'))
 475
 476 #define PRINT_OPERAND(FILE, X, CODE)                            \
 477   lm32_print_operand (FILE, X, CODE)
 478
 479 #define PRINT_OPERAND_ADDRESS(FILE, ADDR)                       \
 480   lm32_print_operand_address (FILE, ADDR)
 481
 482 #ifndef LOCAL_LABEL_PREFIX
 483 #define LOCAL_LABEL_PREFIX      "."
 484 #endif
 485
 486 #define ASM_OUTPUT_ALIGN(FILE,LOG)                              \
 487   do { if ((LOG) != 0) fprintf (FILE, "\t.align %d\n", (1 << (LOG))); } while (0)
 488
 489 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)                    \
 490 do {                                                            \
 491   char label[64];                                               \
 492   ASM_GENERATE_INTERNAL_LABEL (label, "L", VALUE);              \
 493   fprintf (FILE, "\n\t.word\t");                                \
 494   assemble_name (FILE, label);                                  \
 495   fprintf (FILE, "\n");                                         \
 496 } while (0)
 497
 498 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL)        \
 499 do {                                                            \
 500   char label[64];                                               \
 501   fprintf (FILE, "\t.word\t(");                                 \
 502   ASM_GENERATE_INTERNAL_LABEL (label, "L", VALUE);              \
 503   assemble_name (FILE, label);                                  \
 504   fprintf (FILE, "-");                                          \
 505   ASM_GENERATE_INTERNAL_LABEL (label, "L", REL);                \
 506   assemble_name (FILE, label);                                  \
 507   fprintf (FILE, ")\n");                                        \
 508 } while (0)
 509
 510 /*-------------*/
 511 /* Debugging.  */
 512 /*-------------*/
 513
 514 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 515
 516 #define DEFAULT_GDB_EXTENSIONS 1
 517
 518 /*--------*/
 519 /* Misc.  */
 520 /*--------*/
 521
 522 #define CASE_VECTOR_MODE Pmode
 523
 524 #define WORD_REGISTER_OPERATIONS
 525
 526 #define LOAD_EXTEND_OP(MODE) ZERO_EXTEND
 527
 528 #define SHORT_IMMEDIATES_SIGN_EXTEND
 529
 530 #define MOVE_MAX        UNITS_PER_WORD
 531 #define MAX_MOVE_MAX    4
 532
 533 #define SHIFT_COUNT_TRUNCATED 1
 534
 535 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
 536
 537 #define Pmode SImode
 538
 539 #define FUNCTION_MODE SImode
 540
 541 #ifndef NO_IMPLICIT_EXTERN_C
 542 #define NO_IMPLICIT_EXTERN_C
 543 #endif
 544
 545 #define STORE_FLAG_VALUE 1