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) 2009-2025 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 arrays and structures word-aligned to allow faster copying etc.  */
 103 #define DATA_ALIGNMENT(TYPE, ALIGN)                                     \
 104   ((((ALIGN) < BITS_PER_WORD)                                           \
 105     && (TREE_CODE (TYPE) == ARRAY_TYPE                                  \
 106         || TREE_CODE (TYPE) == UNION_TYPE                               \
 107         || TREE_CODE (TYPE) == RECORD_TYPE)) ? BITS_PER_WORD : (ALIGN))
 108
 109 /* We need this for the same reason as DATA_ALIGNMENT, namely to cause
 110    character arrays to be word-aligned so that `strcpy' calls that copy
 111    constants to character arrays can be done inline, and 'strcmp' can be
 112    optimised to use word loads.  */
 113 #define LOCAL_ALIGNMENT(TYPE, ALIGN) \
 114   DATA_ALIGNMENT (TYPE, ALIGN)
 115
 116 /*----------------------------------------*/
 117 /* Layout of source language data types.  */
 118 /*----------------------------------------*/
 119
 120 #define INT_TYPE_SIZE               32
 121 #define SHORT_TYPE_SIZE             16
 122 #define LONG_TYPE_SIZE              32
 123 #define LONG_LONG_TYPE_SIZE         64
 124
 125 #define DEFAULT_SIGNED_CHAR         0
 126
 127 #define SIZE_TYPE "unsigned int"
 128
 129 #define PTRDIFF_TYPE "int"
 130
 131 /*---------------------------*/
 132 /* Standard register usage.  */
 133 /*---------------------------*/
 134
 135 #define FIRST_PSEUDO_REGISTER  32
 136
 137 #define RV_REGNUM   1
 138 #define GP_REGNUM   26
 139 #define FP_REGNUM   27
 140 #define SP_REGNUM   28
 141 #define RA_REGNUM   29
 142
 143 #define G_REG_P(X)      ((X)<32)
 144
 145 #define FIXED_REGISTERS   \
 146 { 1, 0, 0, 0, 0, 0, 0, 0, \
 147   0, 0, 0, 0, 0, 0, 0, 0, \
 148   0, 0, 0, 0, 0, 0, 0, 0, \
 149   0, 0, 1, 0, 1, 0, 1, 1}
 150
 151 #define CALL_USED_REGISTERS \
 152 { 1, 1, 1, 1, 1, 1, 1, 1,   \
 153   1, 1, 1, 0, 0, 0, 0, 0,   \
 154   0, 0, 0, 0, 0, 0, 0, 0,   \
 155   0, 0, 1, 0, 1, 0, 1, 1}
 156
 157 #define AVOID_CCMODE_COPIES
 158
 159 /*----------------------------------*/
 160 /* Register classes and constants.  */
 161 /*----------------------------------*/
 162
 163 enum reg_class
 164 {
 165   NO_REGS,
 166   GENERAL_REGS,
 167   ALL_REGS,
 168   LIM_REG_CLASSES
 169 };
 170
 171 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 172
 173 #define REG_CLASS_NAMES { "NO_REGS", "GENERAL_REGS", "ALL_REGS" }
 174
 175 #define REG_CLASS_CONTENTS      \
 176 { {0x00000000},                 \
 177   {0xffffffff},                 \
 178   {0xffffffff}                  \
 179 }
 180
 181 #define REGNO_REG_CLASS(REGNO) \
 182     (G_REG_P(REGNO) ? GENERAL_REGS : NO_REGS)
 183
 184 #define INDEX_REG_CLASS NO_REGS
 185
 186 #define BASE_REG_CLASS GENERAL_REGS
 187
 188 #define REGNO_OK_FOR_BASE_P(REGNO) \
 189     (G_REG_P (REGNO) || G_REG_P ((unsigned) reg_renumber[REGNO]))
 190
 191 #define REGNO_OK_FOR_INDEX_P(REGNO) 0
 192
 193 /*----------------------------------------*/
 194 /* Stack Layout and Calling Conventions.  */
 195 /*----------------------------------------*/
 196
 197 #define STACK_GROWS_DOWNWARD 1
 198
 199 #define FRAME_GROWS_DOWNWARD 1
 200
 201 #define STACK_POINTER_OFFSET (UNITS_PER_WORD)
 202
 203 #define FIRST_PARM_OFFSET(FNDECL) (UNITS_PER_WORD)
 204
 205 #define STACK_POINTER_REGNUM SP_REGNUM
 206
 207 #define FRAME_POINTER_REGNUM FP_REGNUM
 208
 209 #define ARG_POINTER_REGNUM FRAME_POINTER_REGNUM
 210
 211 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (SImode, RA_REGNUM)
 212
 213 #define RETURN_ADDR_RTX(count, frame)                                   \
 214   lm32_return_addr_rtx (count, frame)
 215
 216 /* FIXME - This is not yet supported.  */
 217 #define STATIC_CHAIN_REGNUM 9
 218
 219 #define ELIMINABLE_REGS \
 220 {{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM },                        \
 221  { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM },                          \
 222 }
 223
 224 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 225   (OFFSET) = lm32_compute_initial_elimination_offset (FROM, TO)
 226
 227 /*-----------------------------*/
 228 /* Function argument passing.  */
 229 /*-----------------------------*/
 230
 231 #define ACCUMULATE_OUTGOING_ARGS 1
 232
 233 /*--------------------------------*/
 234 /* Passing Arguments in Registers */
 235 /*--------------------------------*/
 236
 237 /* The first argument register.  */
 238 #define LM32_FIRST_ARG_REG 1
 239
 240 /* The number of (integer) argument register available.  */
 241 #define LM32_NUM_ARG_REGS 8
 242
 243 #define CUMULATIVE_ARGS int
 244
 245 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,INDIRECT,N_NAMED_ARGS)  \
 246   (CUM) = 0
 247
 248 #define FUNCTION_ARG_REGNO_P(r)                                         \
 249   (((r) >= LM32_FIRST_ARG_REG) && ((r) <= LM32_NUM_ARG_REGS))
 250
 251 /*--------------------*/
 252 /* Function results.  */
 253 /*--------------------*/
 254
 255 #define FUNCTION_VALUE(VALTYPE, FUNC)                                   \
 256    gen_rtx_REG ((INTEGRAL_TYPE_P (VALTYPE)                              \
 257                  && TYPE_PRECISION (VALTYPE) < BITS_PER_WORD)           \
 258                     ? word_mode                                         \
 259                     : TYPE_MODE (VALTYPE),                              \
 260                     RV_REGNUM)
 261
 262 #define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, RV_REGNUM)
 263
 264 #define FUNCTION_VALUE_REGNO_P(N) ((N) == RV_REGNUM)
 265
 266 #define RETURN_IN_MEMORY(TYPE) lm32_return_in_memory (TYPE)
 267
 268 #define DEFAULT_PCC_STRUCT_RETURN 0
 269
 270 /* Convert from bytes to ints.  */
 271 #define LM32_NUM_INTS(X) (((X) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 272
 273 /* The number of (integer) registers required to hold a quantity of
 274    type MODE.  */
 275 #define LM32_NUM_REGS(MODE) LM32_NUM_INTS (GET_MODE_SIZE (MODE))
 276
 277 /* The number of (integer) registers required to hold a quantity of
 278    TYPE MODE.  */
 279 #define LM32_NUM_REGS2(MODE, TYPE)                       \
 280   LM32_NUM_INTS ((MODE) == BLKmode ?                     \
 281   int_size_in_bytes (TYPE) : GET_MODE_SIZE (MODE))
 282
 283 /*---------------------------*/
 284 /* Function entry and exit.  */
 285 /*---------------------------*/
 286
 287 /*-------------*/
 288 /* Profiling.  */
 289 /*-------------*/
 290
 291 #define FUNCTION_PROFILER(FILE, LABELNO)
 292
 293 /*---------------*/
 294 /* Trampolines.  */
 295 /*---------------*/
 296
 297 #define TRAMPOLINE_SIZE         0
 298
 299 /*---------------------*/
 300 /*  Addressing Modes.  */
 301 /*---------------------*/
 302
 303 #define CONSTANT_ADDRESS_P(X)                                           \
 304   ((GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF             \
 305     || GET_CODE (X) == CONST_INT || GET_CODE (X) == HIGH                \
 306     || (GET_CODE (X) == CONST)))
 307
 308 #define MAX_REGS_PER_ADDRESS 1
 309
 310 #define STRICT_REG_OK_FOR_BASE_P(X)                                     \
 311   (REGNO_OK_FOR_BASE_P (REGNO (X)))
 312 #define NONSTRICT_REG_OK_FOR_BASE_P(X)                                  \
 313   (G_REG_P (REGNO (X)) || !HARD_REGISTER_NUM_P (REGNO (X)))
 314
 315 #ifdef REG_OK_STRICT
 316 #define REG_OK_FOR_BASE_P(X) STRICT_REG_OK_FOR_BASE_P(X)
 317 #else
 318 #define REG_OK_FOR_BASE_P(X) NONSTRICT_REG_OK_FOR_BASE_P(X)
 319 #endif
 320
 321 /*-------------------------*/
 322 /* Condition Code Status.  */
 323 /*-------------------------*/
 324
 325 #define REVERSIBLE_CC_MODE(MODE) 1
 326
 327 /*---------*/
 328 /* Costs.  */
 329 /*---------*/
 330
 331 #define SLOW_BYTE_ACCESS 1
 332
 333 #define NO_FUNCTION_CSE 1
 334
 335 #define BRANCH_COST(speed_p, predictable_p) 4
 336
 337 #define MOVE_RATIO(speed) (speed ? 24 : 3)
 338
 339 /*------------*/
 340 /* Sections.  */
 341 /*------------*/
 342
 343 #define TEXT_SECTION_ASM_OP             "\t.section\t.text"
 344 #define DATA_SECTION_ASM_OP             "\t.section\t.data"
 345 #define SDATA_SECTION_ASM_OP            "\t.section\t.sdata,\"aw\""
 346 #define BSS_SECTION_ASM_OP              "\t.section\t.bss"
 347 #define SBSS_SECTION_ASM_OP             "\t.section\t.sbss,\"aw\""
 348
 349 /*-------*/
 350 /* PIC.  */
 351 /*-------*/
 352
 353 #define PIC_OFFSET_TABLE_REGNUM (flag_pic ? GP_REGNUM : INVALID_REGNUM)
 354
 355 #define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)
 356
 357 #define LEGITIMATE_PIC_OPERAND_P(X)                                    \
 358         (!(nonpic_symbol_mentioned_p (X)))
 359
 360 /*-------------*/
 361 /* Assembler.  */
 362 /*-------------*/
 363
 364 #define ASM_COMMENT_START "#"
 365
 366 #define ASM_APP_ON "#APP\n"
 367
 368 #define ASM_APP_OFF "#NO_APP\n"
 369
 370 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 371  do {                                                                   \
 372         fputc ( '\t', FILE);                                            \
 373         assemble_name (FILE, LABEL1);                                   \
 374         fputs ( " = ", FILE);                                           \
 375         assemble_name (FILE, LABEL2);                                   \
 376         fputc ( '\n', FILE);                                            \
 377  } while (0)
 378
 379 /* Override default implementation in elfos.h to support -G.  */
 380 #undef  ASM_OUTPUT_ALIGNED_LOCAL
 381 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)               \
 382 do {                                                                    \
 383   if ((SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value)                \
 384     switch_to_section (sbss_section);                                   \
 385   else                                                                  \
 386     switch_to_section (bss_section);                                    \
 387   ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");                     \
 388   if (!flag_inhibit_size_directive)                                     \
 389     ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE);                       \
 390   ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT));       \
 391   ASM_OUTPUT_LABEL(FILE, NAME);                                         \
 392   ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1);                         \
 393 } while (0)
 394
 395 /* Override default implementation in elfos.h to support -G.  */
 396 #undef  ASM_OUTPUT_ALIGNED_COMMON
 397 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 398 do                                                                      \
 399 {                                                                       \
 400   if ((SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value)                \
 401     {                                                                   \
 402       switch_to_section (sbss_section);                                 \
 403       (*targetm.asm_out.globalize_label) (FILE, NAME);                  \
 404       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");                 \
 405       if (!flag_inhibit_size_directive)                                 \
 406         ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE);                   \
 407       ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT));   \
 408       ASM_OUTPUT_LABEL(FILE, NAME);                                     \
 409       ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1);                     \
 410     }                                                                   \
 411   else                                                                  \
 412     {                                                                   \
 413       switch_to_section (bss_section);                                  \
 414       fprintf ((FILE), "%s", COMMON_ASM_OP);                            \
 415       assemble_name ((FILE), (NAME));                                   \
 416       fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n",          \
 417                (SIZE), (ALIGN) / BITS_PER_UNIT);                        \
 418     }                                                                   \
 419 }                                                                       \
 420 while (0)
 421
 422 #define ASM_OUTPUT_LABEL(FILE, NAME) \
 423   do { assemble_name (FILE, NAME); fputs (":\n", FILE); } while (0)
 424
 425 #define ASM_OUTPUT_LABELREF(FILE,NAME)  \
 426   do {                                  \
 427     const char *xname = (NAME);         \
 428     if (xname[0] == '@')                \
 429       xname += 1;                       \
 430     if (xname[0] == '*')                \
 431       xname += 1;                       \
 432     fputs (xname, FILE);                \
 433   } while (0)
 434
 435 #define ASM_OUTPUT_SYMBOL_REF(STREAM, SYMBOL)                           \
 436   do {                                                                  \
 437     assemble_name (STREAM, XSTR (SYMBOL, 0));                           \
 438   } while (0)
 439
 440 #define GLOBAL_ASM_OP "\t.global\t"
 441
 442 #define REGISTER_NAMES                                          \
 443 {                                                               \
 444  "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",         \
 445  "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",        \
 446  "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",        \
 447  "r24", "r25",  "gp",  "fp",  "sp",  "ra",  "ea",  "ba"}
 448
 449 #define PRINT_OPERAND_PUNCT_VALID_P(CHAR) \
 450   (((CHAR) == '&') || ((CHAR) == '@') || ((CHAR) == '*'))
 451
 452 #define PRINT_OPERAND(FILE, X, CODE)                            \
 453   lm32_print_operand (FILE, X, CODE)
 454
 455 #define PRINT_OPERAND_ADDRESS(FILE, ADDR)                       \
 456   lm32_print_operand_address (FILE, ADDR)
 457
 458 #ifndef LOCAL_LABEL_PREFIX
 459 #define LOCAL_LABEL_PREFIX      "."
 460 #endif
 461
 462 #define ASM_OUTPUT_ALIGN(FILE,LOG)                              \
 463   do { if ((LOG) != 0) fprintf (FILE, "\t.align %d\n", (1 << (LOG))); } while (0)
 464
 465 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)                    \
 466 do {                                                            \
 467   char label[64];                                               \
 468   ASM_GENERATE_INTERNAL_LABEL (label, "L", VALUE);              \
 469   fprintf (FILE, "\n\t.word\t");                                \
 470   assemble_name (FILE, label);                                  \
 471   fprintf (FILE, "\n");                                         \
 472 } while (0)
 473
 474 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL)        \
 475 do {                                                            \
 476   char label[64];                                               \
 477   fprintf (FILE, "\t.word\t(");                                 \
 478   ASM_GENERATE_INTERNAL_LABEL (label, "L", VALUE);              \
 479   assemble_name (FILE, label);                                  \
 480   fprintf (FILE, "-");                                          \
 481   ASM_GENERATE_INTERNAL_LABEL (label, "L", REL);                \
 482   assemble_name (FILE, label);                                  \
 483   fprintf (FILE, ")\n");                                        \
 484 } while (0)
 485
 486 /*-------------*/
 487 /* Debugging.  */
 488 /*-------------*/
 489
 490 #define DEBUGGER_REGNO(REGNO) (REGNO)
 491
 492 #define DEFAULT_GDB_EXTENSIONS 1
 493
 494 /*--------*/
 495 /* Misc.  */
 496 /*--------*/
 497
 498 #define CASE_VECTOR_MODE Pmode
 499
 500 #define WORD_REGISTER_OPERATIONS 1
 501
 502 #define LOAD_EXTEND_OP(MODE) ZERO_EXTEND
 503
 504 #define SHORT_IMMEDIATES_SIGN_EXTEND 1
 505
 506 #define MOVE_MAX        UNITS_PER_WORD
 507 #define MAX_MOVE_MAX    4
 508
 509 #define SHIFT_COUNT_TRUNCATED 1
 510
 511 #define Pmode SImode
 512
 513 #define FUNCTION_MODE SImode
 514
 515 #define STORE_FLAG_VALUE 1