1 /* Definitions of target machine for GNU compiler, Lattice Mico32 architecture. 2 Contributed by Jon Beniston <jon@beniston.com> 3 4 Copyright (C) 2009-2021 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 FLOAT_TYPE_SIZE 32 126 #define DOUBLE_TYPE_SIZE 64 127 #define LONG_DOUBLE_TYPE_SIZE 64 128 129 #define DEFAULT_SIGNED_CHAR 0 130 131 #define SIZE_TYPE "unsigned int" 132 133 #define PTRDIFF_TYPE "int" 134 135 /*---------------------------*/ 136 /* Standard register usage. */ 137 /*---------------------------*/ 138 139 #define FIRST_PSEUDO_REGISTER 32 140 141 #define RV_REGNUM 1 142 #define GP_REGNUM 26 143 #define FP_REGNUM 27 144 #define SP_REGNUM 28 145 #define RA_REGNUM 29 146 147 #define G_REG_P(X) ((X)<32) 148 149 #define FIXED_REGISTERS \ 150 { 1, 0, 0, 0, 0, 0, 0, 0, \ 151 0, 0, 0, 0, 0, 0, 0, 0, \ 152 0, 0, 0, 0, 0, 0, 0, 0, \ 153 0, 0, 1, 0, 1, 0, 1, 1} 154 155 #define CALL_USED_REGISTERS \ 156 { 1, 1, 1, 1, 1, 1, 1, 1, \ 157 1, 1, 1, 0, 0, 0, 0, 0, \ 158 0, 0, 0, 0, 0, 0, 0, 0, \ 159 0, 0, 1, 0, 1, 0, 1, 1} 160 161 #define AVOID_CCMODE_COPIES 162 163 /*----------------------------------*/ 164 /* Register classes and constants. */ 165 /*----------------------------------*/ 166 167 enum reg_class 168 { 169 NO_REGS, 170 GENERAL_REGS, 171 ALL_REGS, 172 LIM_REG_CLASSES 173 }; 174 175 #define N_REG_CLASSES (int) LIM_REG_CLASSES 176 177 #define REG_CLASS_NAMES { "NO_REGS", "GENERAL_REGS", "ALL_REGS" } 178 179 #define REG_CLASS_CONTENTS \ 180 { {0x00000000}, \ 181 {0xffffffff}, \ 182 {0xffffffff} \ 183 } 184 185 #define REGNO_REG_CLASS(REGNO) \ 186 (G_REG_P(REGNO) ? GENERAL_REGS : NO_REGS) 187 188 #define INDEX_REG_CLASS NO_REGS 189 190 #define BASE_REG_CLASS GENERAL_REGS 191 192 #define REGNO_OK_FOR_BASE_P(REGNO) \ 193 (G_REG_P (REGNO) || G_REG_P ((unsigned) reg_renumber[REGNO])) 194 195 #define REGNO_OK_FOR_INDEX_P(REGNO) 0 196 197 /*----------------------------------------*/ 198 /* Stack Layout and Calling Conventions. */ 199 /*----------------------------------------*/ 200 201 #define STACK_GROWS_DOWNWARD 1 202 203 #define FRAME_GROWS_DOWNWARD 1 204 205 #define STACK_POINTER_OFFSET (UNITS_PER_WORD) 206 207 #define FIRST_PARM_OFFSET(FNDECL) (UNITS_PER_WORD) 208 209 #define STACK_POINTER_REGNUM SP_REGNUM 210 211 #define FRAME_POINTER_REGNUM FP_REGNUM 212 213 #define ARG_POINTER_REGNUM FRAME_POINTER_REGNUM 214 215 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (SImode, RA_REGNUM) 216 217 #define RETURN_ADDR_RTX(count, frame) \ 218 lm32_return_addr_rtx (count, frame) 219 220 /* FIXME - This is not yet supported. */ 221 #define STATIC_CHAIN_REGNUM 9 222 223 #define ELIMINABLE_REGS \ 224 {{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM }, \ 225 { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM }, \ 226 } 227 228 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \ 229 (OFFSET) = lm32_compute_initial_elimination_offset (FROM, TO) 230 231 /*-----------------------------*/ 232 /* Function argument passing. */ 233 /*-----------------------------*/ 234 235 #define ACCUMULATE_OUTGOING_ARGS 1 236 237 /*--------------------------------*/ 238 /* Passing Arguments in Registers */ 239 /*--------------------------------*/ 240 241 /* The first argument register. */ 242 #define LM32_FIRST_ARG_REG 1 243 244 /* The number of (integer) argument register available. */ 245 #define LM32_NUM_ARG_REGS 8 246 247 #define CUMULATIVE_ARGS int 248 249 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,INDIRECT,N_NAMED_ARGS) \ 250 (CUM) = 0 251 252 #define FUNCTION_ARG_REGNO_P(r) \ 253 (((r) >= LM32_FIRST_ARG_REG) && ((r) <= LM32_NUM_ARG_REGS)) 254 255 /*--------------------*/ 256 /* Function results. */ 257 /*--------------------*/ 258 259 #define FUNCTION_VALUE(VALTYPE, FUNC) \ 260 gen_rtx_REG ((INTEGRAL_TYPE_P (VALTYPE) \ 261 && TYPE_PRECISION (VALTYPE) < BITS_PER_WORD) \ 262 ? word_mode \ 263 : TYPE_MODE (VALTYPE), \ 264 RV_REGNUM) 265 266 #define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, RV_REGNUM) 267 268 #define FUNCTION_VALUE_REGNO_P(N) ((N) == RV_REGNUM) 269 270 #define RETURN_IN_MEMORY(TYPE) lm32_return_in_memory (TYPE) 271 272 #define DEFAULT_PCC_STRUCT_RETURN 0 273 274 /* Convert from bytes to ints. */ 275 #define LM32_NUM_INTS(X) (((X) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) 276 277 /* The number of (integer) registers required to hold a quantity of 278 type MODE. */ 279 #define LM32_NUM_REGS(MODE) LM32_NUM_INTS (GET_MODE_SIZE (MODE)) 280 281 /* The number of (integer) registers required to hold a quantity of 282 TYPE MODE. */ 283 #define LM32_NUM_REGS2(MODE, TYPE) \ 284 LM32_NUM_INTS ((MODE) == BLKmode ? \ 285 int_size_in_bytes (TYPE) : GET_MODE_SIZE (MODE)) 286 287 /*---------------------------*/ 288 /* Function entry and exit. */ 289 /*---------------------------*/ 290 291 /*-------------*/ 292 /* Profiling. */ 293 /*-------------*/ 294 295 #define FUNCTION_PROFILER(FILE, LABELNO) 296 297 /*---------------*/ 298 /* Trampolines. */ 299 /*---------------*/ 300 301 #define TRAMPOLINE_SIZE 0 302 303 /*---------------------*/ 304 /* Addressing Modes. */ 305 /*---------------------*/ 306 307 #define CONSTANT_ADDRESS_P(X) \ 308 ((GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \ 309 || GET_CODE (X) == CONST_INT || GET_CODE (X) == HIGH \ 310 || (GET_CODE (X) == CONST))) 311 312 #define MAX_REGS_PER_ADDRESS 1 313 314 #define STRICT_REG_OK_FOR_BASE_P(X) \ 315 (REGNO_OK_FOR_BASE_P (REGNO (X))) 316 #define NONSTRICT_REG_OK_FOR_BASE_P(X) \ 317 (G_REG_P (REGNO (X)) || !HARD_REGISTER_NUM_P (REGNO (X))) 318 319 #ifdef REG_OK_STRICT 320 #define REG_OK_FOR_BASE_P(X) STRICT_REG_OK_FOR_BASE_P(X) 321 #else 322 #define REG_OK_FOR_BASE_P(X) NONSTRICT_REG_OK_FOR_BASE_P(X) 323 #endif 324 325 /*-------------------------*/ 326 /* Condition Code Status. */ 327 /*-------------------------*/ 328 329 #define REVERSIBLE_CC_MODE(MODE) 1 330 331 /*---------*/ 332 /* Costs. */ 333 /*---------*/ 334 335 #define SLOW_BYTE_ACCESS 1 336 337 #define NO_FUNCTION_CSE 1 338 339 #define BRANCH_COST(speed_p, predictable_p) 4 340 341 #define MOVE_RATIO(speed) (speed ? 24 : 3) 342 343 /*------------*/ 344 /* Sections. */ 345 /*------------*/ 346 347 #define TEXT_SECTION_ASM_OP "\t.section\t.text" 348 #define DATA_SECTION_ASM_OP "\t.section\t.data" 349 #define SDATA_SECTION_ASM_OP "\t.section\t.sdata,\"aw\"" 350 #define BSS_SECTION_ASM_OP "\t.section\t.bss" 351 #define SBSS_SECTION_ASM_OP "\t.section\t.sbss,\"aw\"" 352 353 /*-------*/ 354 /* PIC. */ 355 /*-------*/ 356 357 #define PIC_OFFSET_TABLE_REGNUM (flag_pic ? GP_REGNUM : INVALID_REGNUM) 358 359 #define JUMP_TABLES_IN_TEXT_SECTION (flag_pic) 360 361 #define LEGITIMATE_PIC_OPERAND_P(X) \ 362 (!(nonpic_symbol_mentioned_p (X))) 363 364 /*-------------*/ 365 /* Assembler. */ 366 /*-------------*/ 367 368 #define ASM_COMMENT_START "#" 369 370 #define ASM_APP_ON "#APP\n" 371 372 #define ASM_APP_OFF "#NO_APP\n" 373 374 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \ 375 do { \ 376 fputc ( '\t', FILE); \ 377 assemble_name (FILE, LABEL1); \ 378 fputs ( " = ", FILE); \ 379 assemble_name (FILE, LABEL2); \ 380 fputc ( '\n', FILE); \ 381 } while (0) 382 383 /* Override default implementation in elfos.h to support -G. */ 384 #undef ASM_OUTPUT_ALIGNED_LOCAL 385 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ 386 do { \ 387 if ((SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value) \ 388 switch_to_section (sbss_section); \ 389 else \ 390 switch_to_section (bss_section); \ 391 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ 392 if (!flag_inhibit_size_directive) \ 393 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE); \ 394 ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \ 395 ASM_OUTPUT_LABEL(FILE, NAME); \ 396 ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1); \ 397 } while (0) 398 399 /* Override default implementation in elfos.h to support -G. */ 400 #undef ASM_OUTPUT_ALIGNED_COMMON 401 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ 402 do \ 403 { \ 404 if ((SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value) \ 405 { \ 406 switch_to_section (sbss_section); \ 407 (*targetm.asm_out.globalize_label) (FILE, NAME); \ 408 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ 409 if (!flag_inhibit_size_directive) \ 410 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE); \ 411 ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \ 412 ASM_OUTPUT_LABEL(FILE, NAME); \ 413 ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1); \ 414 } \ 415 else \ 416 { \ 417 switch_to_section (bss_section); \ 418 fprintf ((FILE), "%s", COMMON_ASM_OP); \ 419 assemble_name ((FILE), (NAME)); \ 420 fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \ 421 (SIZE), (ALIGN) / BITS_PER_UNIT); \ 422 } \ 423 } \ 424 while (0) 425 426 #define ASM_OUTPUT_LABEL(FILE, NAME) \ 427 do { assemble_name (FILE, NAME); fputs (":\n", FILE); } while (0) 428 429 #define ASM_OUTPUT_LABELREF(FILE,NAME) \ 430 do { \ 431 const char *xname = (NAME); \ 432 if (xname[0] == '@') \ 433 xname += 1; \ 434 if (xname[0] == '*') \ 435 xname += 1; \ 436 fputs (xname, FILE); \ 437 } while (0) 438 439 #define ASM_OUTPUT_SYMBOL_REF(STREAM, SYMBOL) \ 440 do { \ 441 assemble_name (STREAM, XSTR (SYMBOL, 0)); \ 442 } while (0) 443 444 #define GLOBAL_ASM_OP "\t.global\t" 445 446 #define REGISTER_NAMES \ 447 { \ 448 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ 449 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \ 450 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \ 451 "r24", "r25", "gp", "fp", "sp", "ra", "ea", "ba"} 452 453 #define PRINT_OPERAND_PUNCT_VALID_P(CHAR) \ 454 (((CHAR) == '&') || ((CHAR) == '@') || ((CHAR) == '*')) 455 456 #define PRINT_OPERAND(FILE, X, CODE) \ 457 lm32_print_operand (FILE, X, CODE) 458 459 #define PRINT_OPERAND_ADDRESS(FILE, ADDR) \ 460 lm32_print_operand_address (FILE, ADDR) 461 462 #ifndef LOCAL_LABEL_PREFIX 463 #define LOCAL_LABEL_PREFIX "." 464 #endif 465 466 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 467 do { if ((LOG) != 0) fprintf (FILE, "\t.align %d\n", (1 << (LOG))); } while (0) 468 469 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \ 470 do { \ 471 char label[64]; \ 472 ASM_GENERATE_INTERNAL_LABEL (label, "L", VALUE); \ 473 fprintf (FILE, "\n\t.word\t"); \ 474 assemble_name (FILE, label); \ 475 fprintf (FILE, "\n"); \ 476 } while (0) 477 478 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \ 479 do { \ 480 char label[64]; \ 481 fprintf (FILE, "\t.word\t("); \ 482 ASM_GENERATE_INTERNAL_LABEL (label, "L", VALUE); \ 483 assemble_name (FILE, label); \ 484 fprintf (FILE, "-"); \ 485 ASM_GENERATE_INTERNAL_LABEL (label, "L", REL); \ 486 assemble_name (FILE, label); \ 487 fprintf (FILE, ")\n"); \ 488 } while (0) 489 490 /*-------------*/ 491 /* Debugging. */ 492 /*-------------*/ 493 494 #define DBX_REGISTER_NUMBER(REGNO) (REGNO) 495 496 #define DEFAULT_GDB_EXTENSIONS 1 497 498 /*--------*/ 499 /* Misc. */ 500 /*--------*/ 501 502 #define CASE_VECTOR_MODE Pmode 503 504 #define WORD_REGISTER_OPERATIONS 1 505 506 #define LOAD_EXTEND_OP(MODE) ZERO_EXTEND 507 508 #define SHORT_IMMEDIATES_SIGN_EXTEND 1 509 510 #define MOVE_MAX UNITS_PER_WORD 511 #define MAX_MOVE_MAX 4 512 513 #define SHIFT_COUNT_TRUNCATED 1 514 515 #define Pmode SImode 516 517 #define FUNCTION_MODE SImode 518 519 #define STORE_FLAG_VALUE 1 520