gcc/config/moxie/moxie.h

   1 /* Target Definitions for moxie.
   2    Copyright (C) 2008, 2009, 2010  Free Software Foundation, Inc.
   3    Contributed by Anthony Green.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_MOXIE_H
  22 #define GCC_MOXIE_H
  23
  24 /* This is defined by svr4.h, which is included prior to this file.
  25    However, we should undefine it for moxie-elf, since we don't provide
  26    functions like access() and mkdir() in newlib.  This will have to
  27    be defined again for a Linux port.  */
  28 #undef TARGET_POSIX_IO
  29
  30 /* Another C string constant used much like `LINK_SPEC'.  The difference
  31    between the two is that `STARTFILE_SPEC' is used at the very beginning of
  32    the command given to the linker.
  33
  34    If this macro is not defined, a default is provided that loads the standard
  35    C startup file from the usual place.  See `gcc.c'.
  36
  37    Defined in svr4.h.  */
  38 #undef  STARTFILE_SPEC
  39 #define STARTFILE_SPEC "crt0%O%s crti.o%s crtbegin.o%s"
  40
  41 /* Provide an ENDFILE_SPEC appropriate for svr4.  Here we tack on our own
  42    magical crtend.o file (see crtstuff.c) which provides part of the
  43    support for getting C++ file-scope static object constructed before
  44    entering `main', followed by the normal svr3/svr4 "finalizer" file,
  45    which is either `gcrtn.o' or `crtn.o'.  */
  46
  47 #undef  ENDFILE_SPEC
  48 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
  49
  50 /* Provide a LIB_SPEC appropriate for svr4.  Here we tack on the default
  51    standard C library (unless we are building a shared library) and
  52    the simulator BSP code.  */
  53
  54 #undef LIB_SPEC
  55 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
  56
  57 /* Layout of Source Language Data Types */
  58
  59 #define INT_TYPE_SIZE 32
  60 #define SHORT_TYPE_SIZE 16
  61 #define LONG_TYPE_SIZE 32
  62 #define LONG_LONG_TYPE_SIZE 64
  63
  64 #define FLOAT_TYPE_SIZE 32
  65 #define DOUBLE_TYPE_SIZE 64
  66 #define LONG_DOUBLE_TYPE_SIZE 64
  67
  68 #define DEFAULT_SIGNED_CHAR 1
  69
  70 /* Registers...
  71
  72    $fp  - frame pointer
  73    $sp  - stack pointer
  74    $r0  - general purpose 32-bit register.
  75    $r1  - general purpose 32-bit register.
  76    $r2  - general purpose 32-bit register.
  77    $r3  - general purpose 32-bit register.
  78    $r4  - general purpose 32-bit register.
  79    $r5  - general purpose 32-bit register.
  80    $r6  - general purpose 32-bit register.
  81    $r7  - general purpose 32-bit register.
  82    $r8  - general purpose 32-bit register.
  83    $r9  - general purpose 32-bit register.
  84    $r10 - general purpose 32-bit register.
  85    $r11 - general purpose 32-bit register.
  86    $r12 - general purpose 32-bit register.
  87    $r13 - reserved for execution environment.
  88
  89    Special Registers...
  90
  91    $pc - 32-bit program counter.
  92
  93 */
  94
  95 #define REGISTER_NAMES {        \
  96   "$fp", "$sp", "$r0", "$r1",   \
  97   "$r2", "$r3", "$r4", "$r5",   \
  98   "$r6", "$r7", "$r8", "$r9",   \
  99   "$r10", "$r11", "$r12", "$r13",   \
 100   "?fp", "?ap", "$pc", "?cc" }
 101
 102 #define MOXIE_FP     0
 103 #define MOXIE_SP     1
 104 #define MOXIE_R0     2
 105 #define MOXIE_R1     3
 106 #define MOXIE_R2     4
 107 #define MOXIE_R3     5
 108 #define MOXIE_R4     6
 109 #define MOXIE_R5     7
 110 #define MOXIE_R6     8
 111 #define MOXIE_R7     9
 112 #define MOXIE_R8     10
 113 #define MOXIE_R9     11
 114 #define MOXIE_R10    12
 115 #define MOXIE_R11    13
 116 #define MOXIE_R12    14
 117 #define MOXIE_R13    15
 118 #define MOXIE_QFP    16
 119 #define MOXIE_QAP    17
 120 #define MOXIE_PC     18
 121 #define MOXIE_CC     19
 122
 123 #define FIRST_PSEUDO_REGISTER 20
 124
 125 enum reg_class
 126 {
 127   NO_REGS,
 128   GENERAL_REGS,
 129   SPECIAL_REGS,
 130   CC_REGS,
 131   ALL_REGS,
 132   LIM_REG_CLASSES
 133 };
 134
 135
 136 /* The following macro defines cover classes for Integrated Register
 137    Allocator.  Cover classes is a set of non-intersected register
 138    classes covering all hard registers used for register allocation
 139    purpose.  Any move between two registers of a cover class should be
 140    cheaper than load or store of the registers.  The macro value is
 141    array of register classes with LIM_REG_CLASSES used as the end
 142    marker.  */
 143 #define IRA_COVER_CLASSES { GENERAL_REGS, LIM_REG_CLASSES }
 144
 145 #define REG_CLASS_CONTENTS \
 146 { { 0x00000000 }, /* Empty */                      \
 147   { 0x0003FFFF }, /* $fp, $sp, $r0 to $r13, ?fp */ \
 148   { 0x00040000 }, /* $pc */                        \
 149   { 0x00080000 }, /* ?cc */                        \
 150   { 0x000FFFFF }  /* All registers */              \
 151 }
 152
 153 #define N_REG_CLASSES LIM_REG_CLASSES
 154
 155 #define REG_CLASS_NAMES {\
 156     "NO_REGS", \
 157     "GENERAL_REGS", \
 158     "SPECIAL_REGS", \
 159     "CC_REGS", \
 160     "ALL_REGS" }
 161
 162 #define FIXED_REGISTERS     { 1, 1, 0, 0, \
 163                               0, 0, 0, 0, \
 164                               0, 0, 0, 0, \
 165                               0, 0, 0, 1, \
 166                               1, 1, 1, 1 }
 167
 168 #define CALL_USED_REGISTERS { 1, 1, 1, 1, \
 169                               1, 1, 1, 1, \
 170                               0, 0, 0, 0, \
 171                               0, 0, 1, 1, \
 172                               1, 1, 1, 1 }
 173
 174 /* We can't copy to or from our CC register. */
 175 #define AVOID_CCMODE_COPIES 1
 176
 177 /* A C expression that is nonzero if it is permissible to store a
 178    value of mode MODE in hard register number REGNO (or in several
 179    registers starting with that one).  All gstore registers are
 180    equivalent, so we can set this to 1.  */
 181 #define HARD_REGNO_MODE_OK(R,M) 1
 182
 183 /* A C expression whose value is a register class containing hard
 184    register REGNO.  */
 185 #define REGNO_REG_CLASS(R) ((R < MOXIE_PC) ? GENERAL_REGS :             \
 186                             (R == MOXIE_CC ? CC_REGS : SPECIAL_REGS))
 187
 188 /* A C expression for the number of consecutive hard registers,
 189    starting at register number REGNO, required to hold a value of mode
 190    MODE.  */
 191 #define HARD_REGNO_NREGS(REGNO, MODE)                      \
 192   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1)             \
 193    / UNITS_PER_WORD)
 194
 195 /* A C expression that is nonzero if a value of mode MODE1 is
 196    accessible in mode MODE2 without copying.  */
 197 #define MODES_TIEABLE_P(MODE1, MODE2) 1
 198
 199 /* A C expression for the maximum number of consecutive registers of
 200    class CLASS needed to hold a value of mode MODE.  */
 201 #define CLASS_MAX_NREGS(CLASS, MODE) \
 202   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 203
 204 /* A C expression that places additional restrictions on the register
 205    class to use when it is necessary to copy value X into a register
 206    in class CLASS.  */
 207 #define PREFERRED_RELOAD_CLASS(X,CLASS) CLASS
 208
 209 /* The Overall Framework of an Assembler File */
 210
 211 #undef  ASM_SPEC
 212 #define ASM_COMMENT_START "#"
 213 #define ASM_APP_ON ""
 214 #define ASM_APP_OFF ""
 215
 216 #define FILE_ASM_OP     "\t.file\n"
 217
 218 /* Switch to the text or data segment.  */
 219 #define TEXT_SECTION_ASM_OP  "\t.text"
 220 #define DATA_SECTION_ASM_OP  "\t.data"
 221
 222 /* Assembler Commands for Alignment */
 223
 224 #define ASM_OUTPUT_ALIGN(STREAM,POWER) \
 225         fprintf (STREAM, "\t.p2align\t%d\n", POWER);
 226
 227 /* A C compound statement to output to stdio stream STREAM the
 228    assembler syntax for an instruction operand X.  */
 229 #define PRINT_OPERAND(STREAM, X, CODE) moxie_print_operand (STREAM, X, CODE)
 230
 231 #define PRINT_OPERAND_ADDRESS(STREAM ,X) moxie_print_operand_address (STREAM, X)
 232
 233 /* Output and Generation of Labels */
 234
 235 #define GLOBAL_ASM_OP "\t.global\t"
 236
 237 /* Passing Arguments in Registers */
 238
 239 /* A C expression that controls whether a function argument is passed
 240    in a register, and which register.  */
 241 #define FUNCTION_ARG(CUM,MODE,TYPE,NAMED) \
 242   moxie_function_arg(CUM,MODE,TYPE,NAMED)
 243
 244 /* A C type for declaring a variable that is used as the first
 245    argument of `FUNCTION_ARG' and other related values.  */
 246 #define CUMULATIVE_ARGS unsigned int
 247
 248 /* If defined, the maximum amount of space required for outgoing arguments
 249    will be computed and placed into the variable
 250    `current_function_outgoing_args_size'.  No space will be pushed
 251    onto the stack for each call; instead, the function prologue should
 252    increase the stack frame size by this amount.  */
 253 #define ACCUMULATE_OUTGOING_ARGS 1
 254
 255 /* A C statement (sans semicolon) for initializing the variable CUM
 256    for the state at the beginning of the argument list.
 257    For moxie, the first arg is passed in register 2 (aka $r0).  */
 258 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,FNDECL,N_NAMED_ARGS) \
 259   (CUM = MOXIE_R0)
 260
 261 #define MOXIE_FUNCTION_ARG_SIZE(MODE, TYPE)     \
 262   ((MODE) != BLKmode ? GET_MODE_SIZE (MODE)     \
 263    : (unsigned) int_size_in_bytes (TYPE))
 264
 265 #define FUNCTION_ARG_ADVANCE(CUM,MODE,TYPE,NAMED) \
 266   (CUM = (CUM < MOXIE_R6 ?                        \
 267           CUM + ((3 + MOXIE_FUNCTION_ARG_SIZE(MODE,TYPE))/4) : CUM ))
 268
 269 /* How Scalar Function Values Are Returned */
 270
 271 /* STACK AND CALLING */
 272
 273 /* Define this macro if pushing a word onto the stack moves the stack
 274    pointer to a smaller address.  */
 275 #define STACK_GROWS_DOWNWARD
 276
 277 #define INITIAL_FRAME_POINTER_OFFSET(DEPTH) (DEPTH) = 0
 278
 279 /* Offset from the frame pointer to the first local variable slot to
 280    be allocated.  */
 281 #define STARTING_FRAME_OFFSET 0
 282
 283 /* Define this if the above stack space is to be considered part of the
 284    space allocated by the caller.  */
 285 #define OUTGOING_REG_PARM_STACK_SPACE(FNTYPE) 1
 286 #define STACK_PARMS_IN_REG_PARM_AREA
 287
 288 /* Define this if it is the responsibility of the caller to allocate
 289    the area reserved for arguments passed in registers.  */
 290 #define REG_PARM_STACK_SPACE(FNDECL) (6 * UNITS_PER_WORD)
 291
 292 /* Offset from the argument pointer register to the first argument's
 293    address.  On some machines it may depend on the data type of the
 294    function.  */
 295 #define FIRST_PARM_OFFSET(F) 12
 296
 297 /* Define this macro to nonzero value if the addresses of local variable slots
 298    are at negative offsets from the frame pointer.  */
 299 #define FRAME_GROWS_DOWNWARD 1
 300
 301 /* Define this macro as a C expression that is nonzero for registers that are
 302    used by the epilogue or the return pattern.  The stack and frame
 303    pointer registers are already assumed to be used as needed.  */
 304 #define EPILOGUE_USES(R) (R == MOXIE_R5)
 305
 306 #define OVERRIDE_OPTIONS moxie_override_options ()
 307
 308 /* Storage Layout */
 309
 310 #define BITS_BIG_ENDIAN 0
 311 #define BYTES_BIG_ENDIAN 1
 312 #define WORDS_BIG_ENDIAN 1
 313
 314 /* Alignment required for a function entry point, in bits.  */
 315 #define FUNCTION_BOUNDARY 16
 316
 317 /* Define this macro as a C expression which is nonzero if accessing
 318    less than a word of memory (i.e. a `char' or a `short') is no
 319    faster than accessing a word of memory.  */
 320 #define SLOW_BYTE_ACCESS 1
 321
 322 /* Number of storage units in a word; normally the size of a
 323    general-purpose register, a power of two from 1 or 8.  */
 324 #define UNITS_PER_WORD 4
 325
 326 /* Define this macro to the minimum alignment enforced by hardware
 327    for the stack pointer on this machine.  The definition is a C
 328    expression for the desired alignment (measured in bits).  */
 329 #define STACK_BOUNDARY 32
 330
 331 /* Normal alignment required for function parameters on the stack, in
 332    bits.  All stack parameters receive at least this much alignment
 333    regardless of data type.  */
 334 #define PARM_BOUNDARY 32
 335
 336 /* Alignment of field after `int : 0' in a structure.  */
 337 #define EMPTY_FIELD_BOUNDARY  32
 338
 339 /* No data type wants to be aligned rounder than this.  */
 340 #define BIGGEST_ALIGNMENT 32
 341
 342 /* The best alignment to use in cases where we have a choice.  */
 343 #define FASTEST_ALIGNMENT 32
 344
 345 /* Every structures size must be a multiple of 8 bits.  */
 346 #define STRUCTURE_SIZE_BOUNDARY 8
 347
 348 /* Look at the fundamental type that is used for a bit-field and use
 349    that to impose alignment on the enclosing structure.
 350    struct s {int a:8}; should have same alignment as "int", not "char".  */
 351 #define PCC_BITFIELD_TYPE_MATTERS       1
 352
 353 /* Largest integer machine mode for structures.  If undefined, the default
 354    is GET_MODE_SIZE(DImode).  */
 355 #define MAX_FIXED_MODE_SIZE 32
 356
 357 /* Make strings word-aligned so strcpy from constants will be faster.  */
 358 #define CONSTANT_ALIGNMENT(EXP, ALIGN)  \
 359   ((TREE_CODE (EXP) == STRING_CST       \
 360     && (ALIGN) < FASTEST_ALIGNMENT)     \
 361    ? FASTEST_ALIGNMENT : (ALIGN))
 362
 363 /* Make arrays of chars word-aligned for the same reasons.  */
 364 #define DATA_ALIGNMENT(TYPE, ALIGN)             \
 365   (TREE_CODE (TYPE) == ARRAY_TYPE               \
 366    && TYPE_MODE (TREE_TYPE (TYPE)) == QImode    \
 367    && (ALIGN) < FASTEST_ALIGNMENT ? FASTEST_ALIGNMENT : (ALIGN))
 368
 369 /* Set this nonzero if move instructions will actually fail to work
 370    when given unaligned data.  */
 371 #define STRICT_ALIGNMENT 1
 372
 373 /* Generating Code for Profiling */
 374 #define FUNCTION_PROFILER(FILE,LABELNO) (abort (), 0)
 375
 376 /* Trampolines for Nested Functions.  */
 377 #define TRAMPOLINE_SIZE (2 + 6 + 6 + 2 + 2 + 6)
 378
 379 /* Alignment required for trampolines, in bits.  */
 380 #define TRAMPOLINE_ALIGNMENT 32
 381
 382 /* An alias for the machine mode for pointers.  */
 383 #define Pmode         SImode
 384
 385 /* An alias for the machine mode used for memory references to
 386    functions being called, in `call' RTL expressions.  */
 387 #define FUNCTION_MODE QImode
 388
 389 /* The register number of the stack pointer register, which must also
 390    be a fixed register according to `FIXED_REGISTERS'.  */
 391 #define STACK_POINTER_REGNUM MOXIE_SP
 392
 393 /* The register number of the frame pointer register, which is used to
 394    access automatic variables in the stack frame.  */
 395 #define FRAME_POINTER_REGNUM MOXIE_QFP
 396
 397 /* The register number of the arg pointer register, which is used to
 398    access the function's argument list.  */
 399 #define ARG_POINTER_REGNUM MOXIE_QAP
 400
 401 #define HARD_FRAME_POINTER_REGNUM MOXIE_FP
 402
 403 #define ELIMINABLE_REGS                                                 \
 404 {{ FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM },                   \
 405  { ARG_POINTER_REGNUM,   HARD_FRAME_POINTER_REGNUM }}
 406
 407 /* This macro is similar to `INITIAL_FRAME_POINTER_OFFSET'.  It
 408    specifies the initial difference between the specified pair of
 409    registers.  This macro must be defined if `ELIMINABLE_REGS' is
 410    defined.  */
 411 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 412   do {                                                                  \
 413     (OFFSET) = moxie_initial_elimination_offset ((FROM), (TO));         \
 414   } while (0)
 415
 416 /* A C expression that is nonzero if REGNO is the number of a hard
 417    register in which function arguments are sometimes passed.  */
 418 #define FUNCTION_ARG_REGNO_P(r) (r >= MOXIE_R0 && r <= MOXIE_R5)
 419
 420 /* A macro whose definition is the name of the class to which a valid
 421    base register must belong.  A base register is one used in an
 422    address which is the register value plus a displacement.  */
 423 #define BASE_REG_CLASS GENERAL_REGS
 424
 425 #define INDEX_REG_CLASS NO_REGS
 426
 427 #define HARD_REGNO_OK_FOR_BASE_P(NUM) \
 428   ((NUM) >= 0 && (NUM) < FIRST_PSEUDO_REGISTER \
 429    && (REGNO_REG_CLASS(NUM) == GENERAL_REGS \
 430        || (NUM) == HARD_FRAME_POINTER_REGNUM))
 431
 432 /* A C expression which is nonzero if register number NUM is suitable
 433    for use as a base register in operand addresses.  */
 434 #ifdef REG_OK_STRICT
 435 #define REGNO_OK_FOR_BASE_P(NUM)                 \
 436   (HARD_REGNO_OK_FOR_BASE_P(NUM)                 \
 437    || HARD_REGNO_OK_FOR_BASE_P(reg_renumber[(NUM)]))
 438 #else
 439 #define REGNO_OK_FOR_BASE_P(NUM)                 \
 440   ((NUM) >= FIRST_PSEUDO_REGISTER || HARD_REGNO_OK_FOR_BASE_P(NUM))
 441 #endif
 442
 443 /* A C expression which is nonzero if register number NUM is suitable
 444    for use as an index register in operand addresses.  */
 445 #define REGNO_OK_FOR_INDEX_P(NUM) MOXIE_FP
 446
 447 /* The maximum number of bytes that a single instruction can move
 448    quickly between memory and registers or between two memory
 449    locations.  */
 450 #define MOVE_MAX 4
 451 #define TRULY_NOOP_TRUNCATION(op,ip) 1
 452
 453 /* All load operations zero extend.  */
 454 #define LOAD_EXTEND_OP(MEM) ZERO_EXTEND
 455
 456 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACK_SIZE) 0
 457
 458 /* A C expression that is nonzero if X is a legitimate constant for
 459    an immediate operand on the target machine.  */
 460 #define LEGITIMATE_CONSTANT_P(X) 1
 461
 462 /* A number, the maximum number of registers that can appear in a
 463    valid memory address.  */
 464 #define MAX_REGS_PER_ADDRESS 1
 465
 466 #define TRULY_NOOP_TRUNCATION(op,ip) 1
 467
 468 /* An alias for a machine mode name.  This is the machine mode that
 469    elements of a jump-table should have.  */
 470 #define CASE_VECTOR_MODE SImode
 471
 472 /* A C compound statement with a conditional `goto LABEL;' executed
 473    if X (an RTX) is a legitimate memory address on the target machine
 474    for a memory operand of mode MODE.  */
 475 #define GO_IF_LEGITIMATE_ADDRESS(MODE,X,LABEL)          \
 476   do {                                                  \
 477     if (GET_CODE(X) == PLUS)                            \
 478       {                                                 \
 479         rtx op1,op2;                                    \
 480         op1 = XEXP(X,0);                                \
 481         op2 = XEXP(X,1);                                \
 482         if (GET_CODE(op1) == REG                        \
 483             && CONSTANT_ADDRESS_P(op2)                  \
 484             && REGNO_OK_FOR_BASE_P(REGNO(op1)))         \
 485           goto LABEL;                                   \
 486       }                                                 \
 487     if (REG_P (X) && REGNO_OK_FOR_BASE_P (REGNO (X)))   \
 488       goto LABEL;                                       \
 489     if (GET_CODE (X) == SYMBOL_REF                      \
 490         || GET_CODE (X) == LABEL_REF                    \
 491         || GET_CODE (X) == CONST)                       \
 492       goto LABEL;                                       \
 493   } while (0)
 494
 495 /* Run-time Target Specification */
 496
 497 #define TARGET_CPU_CPP_BUILTINS() \
 498   { \
 499     builtin_define_std ("moxie");               \
 500     builtin_define_std ("MOXIE");               \
 501   }
 502
 503 #define HAS_LONG_UNCOND_BRANCH true
 504
 505 #endif /* GCC_MOXIE_H */