1 /* Definitions of target machine for Altera Nios II. 2 Copyright (C) 2012-2017 Free Software Foundation, Inc. 3 Contributed by Jonah Graham (jgraham@altera.com), 4 Will Reece (wreece@altera.com), and Jeff DaSilva (jdasilva@altera.com). 5 Contributed by Mentor Graphics, Inc. 6 7 This file is part of GCC. 8 9 GCC is free software; you can redistribute it and/or modify it 10 under the terms of the GNU General Public License as published 11 by the Free Software Foundation; either version 3, or (at your 12 option) any later version. 13 14 GCC is distributed in the hope that it will be useful, but WITHOUT 15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 17 License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with GCC; see the file COPYING3. If not see 21 <http://www.gnu.org/licenses/>. */ 22 23 #ifndef GCC_NIOS2_H 24 #define GCC_NIOS2_H 25 26 /* Indicate R2 ISA level support. */ 27 #define TARGET_ARCH_R2 (nios2_arch_option == ARCH_R2) 28 29 /* FPU insn codes declared here. */ 30 #include "config/nios2/nios2-opts.h" 31 32 /* Define built-in preprocessor macros. */ 33 #define TARGET_CPU_CPP_BUILTINS() \ 34 do \ 35 { \ 36 builtin_define_std ("NIOS2"); \ 37 builtin_define_std ("nios2"); \ 38 if (TARGET_BIG_ENDIAN) \ 39 builtin_define_std ("nios2_big_endian"); \ 40 else \ 41 builtin_define_std ("nios2_little_endian"); \ 42 builtin_define_with_int_value ( \ 43 "__nios2_arch__", (int) nios2_arch_option); \ 44 } \ 45 while (0) 46 47 /* We're little endian, unless otherwise specified by defining 48 BIG_ENDIAN_FLAG. */ 49 #ifndef TARGET_ENDIAN_DEFAULT 50 # define TARGET_ENDIAN_DEFAULT 0 51 #endif 52 53 /* Default target_flags if no switches specified. */ 54 #ifndef TARGET_DEFAULT 55 # define TARGET_DEFAULT (MASK_HAS_MUL | TARGET_ENDIAN_DEFAULT) 56 #endif 57 58 #define OPTION_DEFAULT_SPECS \ 59 {"arch", "%{!march=*:%{!mcpu=*:-march=%(VALUE)}}" } 60 61 #define CC1_SPEC "%{G*}" 62 63 #if TARGET_ENDIAN_DEFAULT == 0 64 # define ASM_SPEC "%{!meb:-EL} %{meb:-EB} %{march=*:-march=%*}" 65 # define LINK_SPEC_ENDIAN "%{!meb:-EL} %{meb:-EB}" 66 # define MULTILIB_DEFAULTS { "EL" } 67 #else 68 # define ASM_SPEC "%{!mel:-EB} %{mel:-EL} %{march=*:-march=%*}" 69 # define LINK_SPEC_ENDIAN "%{!mel:-EB} %{mel:-EL}" 70 # define MULTILIB_DEFAULTS { "EB" } 71 #endif 72 73 #define LINK_SPEC LINK_SPEC_ENDIAN \ 74 " %{shared:-shared} \ 75 %{static:-Bstatic}" 76 77 78 /* Storage layout. */ 79 80 #define DEFAULT_SIGNED_CHAR 1 81 #define BITS_BIG_ENDIAN 0 82 #define BYTES_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0) 83 #define WORDS_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0) 84 #define BITS_PER_WORD 32 85 #define UNITS_PER_WORD 4 86 #define POINTER_SIZE 32 87 #define BIGGEST_ALIGNMENT 32 88 #define STRICT_ALIGNMENT 1 89 #define FUNCTION_BOUNDARY 32 90 #define PARM_BOUNDARY 32 91 #define STACK_BOUNDARY 32 92 #define PREFERRED_STACK_BOUNDARY 32 93 #define MAX_FIXED_MODE_SIZE 64 94 95 #define CONSTANT_ALIGNMENT(EXP, ALIGN) \ 96 ((TREE_CODE (EXP) == STRING_CST) \ 97 && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN)) 98 99 #define LABEL_ALIGN(LABEL) nios2_label_align (LABEL) 100 101 /* Layout of source language data types. */ 102 103 #define INT_TYPE_SIZE 32 104 #define SHORT_TYPE_SIZE 16 105 #define LONG_TYPE_SIZE 32 106 #define LONG_LONG_TYPE_SIZE 64 107 #define FLOAT_TYPE_SIZE 32 108 #define DOUBLE_TYPE_SIZE 64 109 #define LONG_DOUBLE_TYPE_SIZE DOUBLE_TYPE_SIZE 110 111 #undef SIZE_TYPE 112 #define SIZE_TYPE "unsigned int" 113 114 #undef PTRDIFF_TYPE 115 #define PTRDIFF_TYPE "int" 116 117 118 /* Basic characteristics of Nios II registers: 119 120 Regno Name 121 0 r0 zero always zero 122 1 r1 at Assembler Temporary 123 2-3 r2-r3 Return Location 124 4-7 r4-r7 Register Arguments 125 8-15 r8-r15 Caller Saved Registers 126 16-22 r16-r22 Callee Saved Registers 127 22 r22 Global Offset Table pointer (Linux ABI only) 128 23 r23 Thread pointer (Linux ABI only) 129 24 r24 et Exception Temporary 130 25 r25 bt Breakpoint Temporary 131 26 r26 gp Global Pointer 132 27 r27 sp Stack Pointer 133 28 r28 fp Frame Pointer 134 29 r29 ea Exception Return Address 135 30 r30 ba Breakpoint Return Address 136 31 r31 ra Return Address 137 138 32 ctl0 status 139 33 ctl1 estatus STATUS saved by exception 140 34 ctl2 bstatus STATUS saved by break 141 35 ctl3 ipri Interrupt Priority Mask 142 36 ctl4 ecause Exception Cause 143 144 37 pc Not an actual register 145 146 38 fake_fp Fake Frame Pointer (always eliminated) 147 39 fake_ap Fake Argument Pointer (always eliminated) 148 40 First Pseudo Register 149 150 In addition, r12 is used as the static chain register and r13, r14, and r15 151 are clobbered by PLT code sequences. 152 153 The definitions for all the hard register numbers are located in nios2.md. 154 */ 155 156 #define FIXED_REGISTERS \ 157 { \ 158 /* +0 1 2 3 4 5 6 7 8 9 */ \ 159 /* 0 */ 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, \ 160 /* 10 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 161 /* 20 */ 0, 0, TARGET_LINUX_ABI, TARGET_LINUX_ABI, 1, 1, 1, 1, 0, 1, \ 162 /* 30 */ 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, \ 163 } 164 165 /* Call used == caller saved + fixed regs + args + ret vals. */ 166 #define CALL_USED_REGISTERS \ 167 { \ 168 /* +0 1 2 3 4 5 6 7 8 9 */ \ 169 /* 0 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ 170 /* 10 */ 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, \ 171 /* 20 */ 0, 0, TARGET_LINUX_ABI, TARGET_LINUX_ABI, 1, 1, 1, 1, 0, 1, \ 172 /* 30 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ 173 } 174 175 #define MODES_TIEABLE_P(MODE1, MODE2) 1 176 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1 177 #define HARD_REGNO_NREGS(REGNO, MODE) \ 178 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) 179 180 /* Order in which to allocate registers. Each register must be 181 listed once. This is the default ordering for R1 and non-CDX R2 182 code. For CDX, we overwrite this in ADJUST_REG_ALLOC_ORDER. */ 183 #define REG_ALLOC_ORDER \ 184 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \ 185 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, \ 186 37, 38, 39 } 187 188 #define ADJUST_REG_ALLOC_ORDER nios2_adjust_reg_alloc_order () 189 190 /* Caller-save costs can be less emphasized under R2 CDX, where we can 191 use push.n/pop.n. */ 192 #define HONOR_REG_ALLOC_ORDER (TARGET_HAS_CDX) 193 194 /* Register Classes. */ 195 196 enum reg_class 197 { 198 NO_REGS, 199 SIB_REGS, 200 IJMP_REGS, 201 GP_REGS, 202 ALL_REGS, 203 LIM_REG_CLASSES 204 }; 205 206 #define N_REG_CLASSES (int) LIM_REG_CLASSES 207 208 #define REG_CLASS_NAMES \ 209 { "NO_REGS", \ 210 "SIB_REGS", \ 211 "IJMP_REGS", \ 212 "GP_REGS", \ 213 "ALL_REGS" } 214 215 #define GENERAL_REGS ALL_REGS 216 217 #define REG_CLASS_CONTENTS \ 218 { \ 219 /* NO_REGS */ { 0, 0}, \ 220 /* SIB_REGS */ { 0xfe0c, 0}, \ 221 /* IJMP_REGS */ { 0x7fffffff, 0}, \ 222 /* GP_REGS */ {~0, 0}, \ 223 /* ALL_REGS */ {~0,~0} \ 224 } 225 226 227 #define GP_REG_P(REGNO) ((unsigned)(REGNO) <= LAST_GP_REG) 228 #define REGNO_REG_CLASS(REGNO) (GP_REG_P (REGNO) ? GP_REGS : ALL_REGS) 229 #define CLASS_MAX_NREGS(CLASS, MODE) \ 230 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) 231 232 #define CDX_REG_P(REGNO) \ 233 ((REGNO) == 16 || (REGNO) == 17 || (2 <= (REGNO) && (REGNO) <= 7)) 234 235 /* Tests for various kinds of constants used in the Nios II port. */ 236 237 #define SMALL_INT(X) ((unsigned HOST_WIDE_INT)(X) + 0x8000 < 0x10000) 238 #define SMALL_INT12(X) ((unsigned HOST_WIDE_INT)(X) + 0x800 < 0x1000) 239 #define SMALL_INT_UNSIGNED(X) ((X) >= 0 && (X) < 0x10000) 240 #define UPPER16_INT(X) (((X) & 0xffff) == 0) 241 #define SHIFT_INT(X) ((X) >= 0 && (X) <= 31) 242 #define RDWRCTL_INT(X) ((X) >= 0 && (X) <= 31) 243 #define CUSTOM_INSN_OPCODE(X) ((X) >= 0 && (X) <= 255) 244 #define ANDCLEAR_INT(X) \ 245 (((X) & 0xffff) == 0xffff || (((X) >> 16) & 0xffff) == 0xffff) 246 247 /* Say that the epilogue uses the return address register. Note that 248 in the case of sibcalls, the values "used by the epilogue" are 249 considered live at the start of the called function. */ 250 #define EPILOGUE_USES(REGNO) (epilogue_completed && (REGNO) == RA_REGNO) 251 252 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function, 253 the stack pointer does not matter. The value is tested only in 254 functions that have frame pointers. 255 No definition is equivalent to always zero. */ 256 257 #define EXIT_IGNORE_STACK 1 258 259 /* Trampolines use a 5-instruction sequence. */ 260 #define TRAMPOLINE_SIZE 20 261 262 /* Stack layout. */ 263 #define STACK_GROWS_DOWNWARD 1 264 #define STARTING_FRAME_OFFSET 0 265 #define FIRST_PARM_OFFSET(FUNDECL) 0 266 267 /* Before the prologue, RA lives in r31. */ 268 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, RA_REGNO) 269 #define RETURN_ADDR_RTX(C,F) nios2_get_return_address (C) 270 271 #define DWARF_FRAME_RETURN_COLUMN RA_REGNO 272 273 /* The CFA includes the pretend args. */ 274 #define ARG_POINTER_CFA_OFFSET(FNDECL) \ 275 (gcc_assert ((FNDECL) == current_function_decl), \ 276 FIRST_PARM_OFFSET (FNDECL) + crtl->args.pretend_args_size) 277 278 /* Frame/arg pointer elimination settings. */ 279 #define ELIMINABLE_REGS \ 280 {{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \ 281 { ARG_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}, \ 282 { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \ 283 { FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}} 284 285 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \ 286 (OFFSET) = nios2_initial_elimination_offset ((FROM), (TO)) 287 288 /* Calling convention definitions. */ 289 typedef struct nios2_args 290 { 291 int regs_used; 292 } CUMULATIVE_ARGS; 293 294 #define NUM_ARG_REGS (LAST_ARG_REGNO - FIRST_ARG_REGNO + 1) 295 296 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \ 297 do { (CUM).regs_used = 0; } while (0) 298 299 #define FUNCTION_ARG_PADDING(MODE, TYPE) \ 300 (nios2_function_arg_padding ((MODE), (TYPE))) 301 302 #define PAD_VARARGS_DOWN \ 303 (FUNCTION_ARG_PADDING (TYPE_MODE (type), type) == downward) 304 305 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \ 306 (nios2_block_reg_padding ((MODE), (TYPE), (FIRST))) 307 308 #define FUNCTION_ARG_REGNO_P(REGNO) \ 309 ((REGNO) >= FIRST_ARG_REGNO && (REGNO) <= LAST_ARG_REGNO) 310 311 /* Passing function arguments on stack. */ 312 #define PUSH_ARGS 0 313 #define ACCUMULATE_OUTGOING_ARGS 1 314 315 /* We define TARGET_RETURN_IN_MEMORY, so set to zero. */ 316 #define DEFAULT_PCC_STRUCT_RETURN 0 317 318 /* Profiling. */ 319 #define PROFILE_BEFORE_PROLOGUE 320 #define NO_PROFILE_COUNTERS 1 321 #define FUNCTION_PROFILER(FILE, LABELNO) \ 322 nios2_function_profiler ((FILE), (LABELNO)) 323 324 /* Addressing modes. */ 325 326 #define CONSTANT_ADDRESS_P(X) \ 327 (CONSTANT_P (X) && memory_address_p (SImode, X)) 328 329 #define MAX_REGS_PER_ADDRESS 1 330 #define BASE_REG_CLASS ALL_REGS 331 #define INDEX_REG_CLASS NO_REGS 332 333 #define REGNO_OK_FOR_BASE_P(REGNO) nios2_regno_ok_for_base_p ((REGNO), true) 334 #define REGNO_OK_FOR_INDEX_P(REGNO) 0 335 336 /* Describing Relative Costs of Operations. */ 337 #define MOVE_MAX 4 338 #define SLOW_BYTE_ACCESS 1 339 340 /* It is as good to call a constant function address as to call an address 341 kept in a register. */ 342 #define NO_FUNCTION_CSE 1 343 344 /* Position independent code. */ 345 346 #define PIC_OFFSET_TABLE_REGNUM 22 347 #define LEGITIMATE_PIC_OPERAND_P(X) nios2_legitimate_pic_operand_p (X) 348 349 /* Define output assembler language. */ 350 351 #define ASM_APP_ON "#APP\n" 352 #define ASM_APP_OFF "#NO_APP\n" 353 354 #define ASM_COMMENT_START "# " 355 356 #define GLOBAL_ASM_OP "\t.global\t" 357 358 #define REGISTER_NAMES \ 359 { \ 360 "zero", \ 361 "at", \ 362 "r2", \ 363 "r3", \ 364 "r4", \ 365 "r5", \ 366 "r6", \ 367 "r7", \ 368 "r8", \ 369 "r9", \ 370 "r10", \ 371 "r11", \ 372 "r12", \ 373 "r13", \ 374 "r14", \ 375 "r15", \ 376 "r16", \ 377 "r17", \ 378 "r18", \ 379 "r19", \ 380 "r20", \ 381 "r21", \ 382 "r22", \ 383 "r23", \ 384 "et", \ 385 "bt", \ 386 "gp", \ 387 "sp", \ 388 "fp", \ 389 "ta", \ 390 "ba", \ 391 "ra", \ 392 "status", \ 393 "estatus", \ 394 "bstatus", \ 395 "ipri", \ 396 "ecause", \ 397 "pc", \ 398 "fake_fp", \ 399 "fake_ap", \ 400 } 401 402 #define ADDITIONAL_REGISTER_NAMES \ 403 { \ 404 {"r0", 0}, \ 405 {"r1", 1}, \ 406 {"r24", 24}, \ 407 {"r25", 25}, \ 408 {"r26", 26}, \ 409 {"r27", 27}, \ 410 {"r28", 28}, \ 411 {"r29", 29}, \ 412 {"r30", 30}, \ 413 {"r31", 31} \ 414 } 415 416 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \ 417 do \ 418 { \ 419 fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), FILE); \ 420 fprintf (FILE, ".L%u\n", (unsigned) (VALUE)); \ 421 } \ 422 while (0) 423 424 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL)\ 425 do \ 426 { \ 427 fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), STREAM); \ 428 fprintf (STREAM, ".L%u-.L%u\n", (unsigned) (VALUE), (unsigned) (REL)); \ 429 } \ 430 while (0) 431 432 /* Section directives. */ 433 434 /* Output before read-only data. */ 435 #define TEXT_SECTION_ASM_OP "\t.section\t.text" 436 437 /* Output before writable data. */ 438 #define DATA_SECTION_ASM_OP "\t.section\t.data" 439 440 /* Output before uninitialized data. */ 441 #define BSS_SECTION_ASM_OP "\t.section\t.bss" 442 443 /* Output before 'small' uninitialized data. */ 444 #define SBSS_SECTION_ASM_OP "\t.section\t.sbss" 445 446 #ifndef IN_LIBGCC2 447 /* Default the definition of "small data" to 8 bytes. */ 448 extern unsigned HOST_WIDE_INT nios2_section_threshold; 449 #endif 450 451 #define NIOS2_DEFAULT_GVALUE 8 452 453 /* This says how to output assembler code to declare an 454 uninitialized external linkage data object. Under SVR4, 455 the linker seems to want the alignment of data objects 456 to depend on their types. We do exactly that here. */ 457 #undef COMMON_ASM_OP 458 #define COMMON_ASM_OP "\t.comm\t" 459 460 #define ASM_OUTPUT_ALIGN(FILE, LOG) \ 461 do { \ 462 fprintf ((FILE), "%s%d\n", ALIGN_ASM_OP, (LOG)); \ 463 } while (0) 464 465 #undef ASM_OUTPUT_ALIGNED_COMMON 466 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ 467 do \ 468 { \ 469 fprintf ((FILE), "%s", COMMON_ASM_OP); \ 470 assemble_name ((FILE), (NAME)); \ 471 fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", (SIZE), \ 472 (ALIGN) / BITS_PER_UNIT); \ 473 } \ 474 while (0) 475 476 477 /* This says how to output assembler code to declare an 478 uninitialized internal linkage data object. Under SVR4, 479 the linker seems to want the alignment of data objects 480 to depend on their types. We do exactly that here. */ 481 482 #undef ASM_OUTPUT_ALIGNED_LOCAL 483 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ 484 do { \ 485 if ((SIZE) <= nios2_section_threshold) \ 486 switch_to_section (sbss_section); \ 487 else \ 488 switch_to_section (bss_section); \ 489 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ 490 if (!flag_inhibit_size_directive) \ 491 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE); \ 492 ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \ 493 ASM_OUTPUT_LABEL(FILE, NAME); \ 494 ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1); \ 495 } while (0) 496 497 /* Put the jump tables in .text because when using position-independent code, 498 Nios II elf has no relocation that can represent arbitrary differences 499 between symbols in different sections. */ 500 #define JUMP_TABLES_IN_TEXT_SECTION 1 501 502 /* Exception handling. */ 503 504 /* Describe __builtin_eh_return. */ 505 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, LAST_RETVAL_REGNO) 506 #define EH_RETURN_DATA_REGNO(N) ((N) <= (LAST_ARG_REGNO - FIRST_ARG_REGNO) \ 507 ? (N) + FIRST_ARG_REGNO : INVALID_REGNUM) 508 509 /* Nios II has no appropriate relocations for a 32-bit PC-relative or 510 section-relative pointer encoding. This therefore always chooses an 511 absolute representation for pointers. An unfortunate consequence of 512 this is that ld complains about the absolute fde encoding when linking 513 with -shared or -fpie, but the warning is harmless and there seems to 514 be no good way to suppress it. */ 515 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \ 516 (flag_pic ? DW_EH_PE_aligned : DW_EH_PE_sdata4) 517 518 /* Misc. parameters. */ 519 520 #define STORE_FLAG_VALUE 1 521 #define Pmode SImode 522 #define FUNCTION_MODE QImode 523 524 #define CASE_VECTOR_MODE Pmode 525 526 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1 527 528 #define LOAD_EXTEND_OP(MODE) (ZERO_EXTEND) 529 530 #define WORD_REGISTER_OPERATIONS 1 531 532 #endif /* GCC_NIOS2_H */ 533