gcc/config/moxie/moxie.h

   1 /* Target Definitions for moxie.
   2    Copyright (C) 2008-2021 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 #undef  STARTFILE_SPEC
  25 #define STARTFILE_SPEC "%{!mno-crt0:crt0%O%s} crti.o%s crtbegin.o%s"
  26
  27 /* Provide an ENDFILE_SPEC appropriate for svr4.  Here we tack on our own
  28    magical crtend.o file (see crtstuff.c) which provides part of the
  29    support for getting C++ file-scope static object constructed before
  30    entering `main', followed by the normal svr3/svr4 "finalizer" file,
  31    which is either `gcrtn.o' or `crtn.o'.  */
  32
  33 #undef  ENDFILE_SPEC
  34 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
  35
  36 /* Provide a LIB_SPEC appropriate for svr4.  Here we tack on the default
  37    standard C library (unless we are building a shared library) and
  38    the simulator BSP code.  */
  39
  40 #undef LIB_SPEC
  41 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
  42
  43 #undef  LINK_SPEC
  44 #define LINK_SPEC "%{h*} %{v:-V} %{!mel:-EB} %{mel:-EL}\
  45                    %{static:-Bstatic} %{shared:-shared} %{symbolic:-Bsymbolic}"
  46
  47 #ifndef MULTILIB_DEFAULTS
  48 #define MULTILIB_DEFAULTS { "meb" }
  49 #endif
  50
  51 /* Layout of Source Language Data Types */
  52
  53 #define INT_TYPE_SIZE 32
  54 #define SHORT_TYPE_SIZE 16
  55 #define LONG_TYPE_SIZE 32
  56 #define LONG_LONG_TYPE_SIZE 64
  57
  58 #define FLOAT_TYPE_SIZE 32
  59 #define DOUBLE_TYPE_SIZE 64
  60 #define LONG_DOUBLE_TYPE_SIZE 64
  61
  62 #define DEFAULT_SIGNED_CHAR 0
  63
  64 #undef  SIZE_TYPE
  65 #define SIZE_TYPE "unsigned int"
  66
  67 #undef  PTRDIFF_TYPE
  68 #define PTRDIFF_TYPE "int"
  69
  70 #undef  WCHAR_TYPE
  71 #define WCHAR_TYPE "unsigned int"
  72
  73 #undef  WCHAR_TYPE_SIZE
  74 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  75
  76 /* Registers...
  77
  78    $fp  - frame pointer
  79    $sp  - stack pointer
  80    $r0  - general purpose 32-bit register.
  81    $r1  - general purpose 32-bit register.
  82    $r2  - general purpose 32-bit register.
  83    $r3  - general purpose 32-bit register.
  84    $r4  - general purpose 32-bit register.
  85    $r5  - general purpose 32-bit register.
  86    $r6  - general purpose 32-bit register.
  87    $r7  - general purpose 32-bit register.
  88    $r8  - general purpose 32-bit register.
  89    $r9  - general purpose 32-bit register.
  90    $r10 - general purpose 32-bit register.
  91    $r11 - general purpose 32-bit register.
  92    $r12 - general purpose 32-bit register.
  93    $r13 - reserved for execution environment.
  94
  95    Special Registers...
  96
  97    $pc - 32-bit program counter.
  98
  99 */
 100
 101 #define REGISTER_NAMES {        \
 102   "$fp", "$sp", "$r0", "$r1",   \
 103   "$r2", "$r3", "$r4", "$r5",   \
 104   "$r6", "$r7", "$r8", "$r9",   \
 105   "$r10", "$r11", "$r12", "$r13",   \
 106   "?fp", "?ap", "$pc", "?cc" }
 107
 108 #define MOXIE_FP     0
 109 #define MOXIE_SP     1
 110 #define MOXIE_R0     2
 111 #define MOXIE_R1     3
 112 #define MOXIE_R2     4
 113 #define MOXIE_R3     5
 114 #define MOXIE_R4     6
 115 #define MOXIE_R5     7
 116 #define MOXIE_R6     8
 117 #define MOXIE_R7     9
 118 #define MOXIE_R8     10
 119 #define MOXIE_R9     11
 120 #define MOXIE_R10    12
 121 #define MOXIE_R11    13
 122 #define MOXIE_R12    14
 123 #define MOXIE_R13    15
 124 #define MOXIE_QFP    16
 125 #define MOXIE_QAP    17
 126 #define MOXIE_PC     18
 127 #define MOXIE_CC     19
 128
 129 #define FIRST_PSEUDO_REGISTER 20
 130
 131 enum reg_class
 132 {
 133   NO_REGS,
 134   GENERAL_REGS,
 135   SPECIAL_REGS,
 136   CC_REGS,
 137   ALL_REGS,
 138   LIM_REG_CLASSES
 139 };
 140
 141
 142 #define REG_CLASS_CONTENTS \
 143 { { 0x00000000 }, /* Empty */                      \
 144   { 0x0003FFFF }, /* $fp, $sp, $r0 to $r13, ?fp */ \
 145   { 0x00040000 }, /* $pc */                        \
 146   { 0x00080000 }, /* ?cc */                        \
 147   { 0x000FFFFF }  /* All registers */              \
 148 }
 149
 150 #define N_REG_CLASSES LIM_REG_CLASSES
 151
 152 #define REG_CLASS_NAMES {\
 153     "NO_REGS", \
 154     "GENERAL_REGS", \
 155     "SPECIAL_REGS", \
 156     "CC_REGS", \
 157     "ALL_REGS" }
 158
 159 #define FIXED_REGISTERS     { 1, 1, 0, 0, \
 160                               0, 0, 0, 0, \
 161                               0, 0, 0, 0, \
 162                               0, 0, 0, 1, \
 163                               1, 1, 1, 1 }
 164
 165 #define CALL_USED_REGISTERS { 1, 1, 1, 1, \
 166                               1, 1, 1, 1, \
 167                               0, 0, 0, 0, \
 168                               0, 0, 1, 1, \
 169                               1, 1, 1, 1 }
 170
 171 /* We can't copy to or from our CC register. */
 172 #define AVOID_CCMODE_COPIES 1
 173
 174 /* A C expression whose value is a register class containing hard
 175    register REGNO.  */
 176 #define REGNO_REG_CLASS(R) ((R < MOXIE_PC) ? GENERAL_REGS :             \
 177                             (R == MOXIE_CC ? CC_REGS : SPECIAL_REGS))
 178
 179 /* The Overall Framework of an Assembler File */
 180
 181 #undef  ASM_SPEC
 182 #define ASM_SPEC "%{!mel:-EB} %{mel:-EL}"
 183 #define ASM_COMMENT_START "#"
 184 #define ASM_APP_ON ""
 185 #define ASM_APP_OFF ""
 186
 187 #define FILE_ASM_OP     "\t.file\n"
 188
 189 /* Switch to the text or data segment.  */
 190 #define TEXT_SECTION_ASM_OP  "\t.text"
 191 #define DATA_SECTION_ASM_OP  "\t.data"
 192
 193 /* Assembler Commands for Alignment */
 194
 195 #define ASM_OUTPUT_ALIGN(STREAM,POWER) \
 196         fprintf (STREAM, "\t.p2align\t%d\n", POWER);
 197
 198 /* Output and Generation of Labels */
 199
 200 #define GLOBAL_ASM_OP "\t.global\t"
 201
 202 /* Passing Arguments in Registers */
 203
 204 /* A C type for declaring a variable that is used as the first
 205    argument of `FUNCTION_ARG' and other related values.  */
 206 #define CUMULATIVE_ARGS unsigned int
 207
 208 /* If defined, the maximum amount of space required for outgoing arguments
 209    will be computed and placed into the variable
 210    `current_function_outgoing_args_size'.  No space will be pushed
 211    onto the stack for each call; instead, the function prologue should
 212    increase the stack frame size by this amount.  */
 213 #define ACCUMULATE_OUTGOING_ARGS 1
 214
 215 /* A C statement (sans semicolon) for initializing the variable CUM
 216    for the state at the beginning of the argument list.
 217    For moxie, the first arg is passed in register 2 (aka $r0).  */
 218 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,FNDECL,N_NAMED_ARGS) \
 219   (CUM = MOXIE_R0)
 220
 221 /* How Scalar Function Values Are Returned */
 222
 223 /* STACK AND CALLING */
 224
 225 /* Define this macro if pushing a word onto the stack moves the stack
 226    pointer to a smaller address.  */
 227 #define STACK_GROWS_DOWNWARD 1
 228
 229 /* Define this if the above stack space is to be considered part of the
 230    space allocated by the caller.  */
 231 #define OUTGOING_REG_PARM_STACK_SPACE(FNTYPE) 1
 232 #define STACK_PARMS_IN_REG_PARM_AREA
 233
 234 /* Define this if it is the responsibility of the caller to allocate
 235    the area reserved for arguments passed in registers.  */
 236 #define REG_PARM_STACK_SPACE(FNDECL) (6 * UNITS_PER_WORD)
 237
 238 /* Offset from the argument pointer register to the first argument's
 239    address.  On some machines it may depend on the data type of the
 240    function.  */
 241 #define FIRST_PARM_OFFSET(F) 12
 242
 243 /* Define this macro to nonzero value if the addresses of local variable slots
 244    are at negative offsets from the frame pointer.  */
 245 #define FRAME_GROWS_DOWNWARD 1
 246
 247 /* Define this macro as a C expression that is nonzero for registers that are
 248    used by the epilogue or the return pattern.  The stack and frame
 249    pointer registers are already assumed to be used as needed.  */
 250 #define EPILOGUE_USES(R) (R == MOXIE_R5)
 251
 252 /* A C expression whose value is RTL representing the location of the
 253    incoming return address at the beginning of any function, before
 254    the prologue.  */
 255 #define INCOMING_RETURN_ADDR_RTX                                        \
 256   gen_frame_mem (Pmode,                                                 \
 257                  plus_constant (Pmode, stack_pointer_rtx, UNITS_PER_WORD))
 258
 259 /* Describe how we implement __builtin_eh_return.  */
 260 #define EH_RETURN_DATA_REGNO(N) ((N) < 4 ? (N+2) : INVALID_REGNUM)
 261
 262 /* Store the return handler into the call frame.  */
 263 #define EH_RETURN_HANDLER_RTX                                           \
 264   gen_frame_mem (Pmode,                                                 \
 265                  plus_constant (Pmode, frame_pointer_rtx, UNITS_PER_WORD))
 266
 267 /* Storage Layout */
 268
 269 #define BITS_BIG_ENDIAN 0
 270 #define BYTES_BIG_ENDIAN ( ! TARGET_LITTLE_ENDIAN )
 271 #define WORDS_BIG_ENDIAN ( ! TARGET_LITTLE_ENDIAN )
 272
 273 /* Alignment required for a function entry point, in bits.  */
 274 #define FUNCTION_BOUNDARY 16
 275
 276 /* Define this macro as a C expression which is nonzero if accessing
 277    less than a word of memory (i.e. a `char' or a `short') is no
 278    faster than accessing a word of memory.  */
 279 #define SLOW_BYTE_ACCESS 1
 280
 281 /* Number of storage units in a word; normally the size of a
 282    general-purpose register, a power of two from 1 or 8.  */
 283 #define UNITS_PER_WORD 4
 284
 285 /* Define this macro to the minimum alignment enforced by hardware
 286    for the stack pointer on this machine.  The definition is a C
 287    expression for the desired alignment (measured in bits).  */
 288 #define STACK_BOUNDARY 32
 289
 290 /* Normal alignment required for function parameters on the stack, in
 291    bits.  All stack parameters receive at least this much alignment
 292    regardless of data type.  */
 293 #define PARM_BOUNDARY 32
 294
 295 /* Alignment of field after `int : 0' in a structure.  */
 296 #define EMPTY_FIELD_BOUNDARY  32
 297
 298 /* No data type wants to be aligned rounder than this.  */
 299 #define BIGGEST_ALIGNMENT 32
 300
 301 /* The best alignment to use in cases where we have a choice.  */
 302 #define FASTEST_ALIGNMENT 32
 303
 304 /* Every structures size must be a multiple of 8 bits.  */
 305 #define STRUCTURE_SIZE_BOUNDARY 8
 306
 307 /* Look at the fundamental type that is used for a bit-field and use
 308    that to impose alignment on the enclosing structure.
 309    struct s {int a:8}; should have same alignment as "int", not "char".  */
 310 #define PCC_BITFIELD_TYPE_MATTERS       1
 311
 312 /* Largest integer machine mode for structures.  If undefined, the default
 313    is GET_MODE_SIZE(DImode).  */
 314 #define MAX_FIXED_MODE_SIZE 32
 315
 316 /* Make arrays of chars word-aligned for the same reasons.  */
 317 #define DATA_ALIGNMENT(TYPE, ALIGN)             \
 318   (TREE_CODE (TYPE) == ARRAY_TYPE               \
 319    && TYPE_MODE (TREE_TYPE (TYPE)) == QImode    \
 320    && (ALIGN) < FASTEST_ALIGNMENT ? FASTEST_ALIGNMENT : (ALIGN))
 321
 322 /* Set this nonzero if move instructions will actually fail to work
 323    when given unaligned data.  */
 324 #define STRICT_ALIGNMENT 1
 325
 326 /* Generating Code for Profiling */
 327 #define FUNCTION_PROFILER(FILE,LABELNO) (abort (), 0)
 328
 329 /* Trampolines for Nested Functions.  */
 330 #define TRAMPOLINE_SIZE (2 + 6 + 4 + 2 + 6)
 331
 332 /* Alignment required for trampolines, in bits.  */
 333 #define TRAMPOLINE_ALIGNMENT 32
 334
 335 /* An alias for the machine mode for pointers.  */
 336 #define Pmode         SImode
 337
 338 /* An alias for the machine mode used for memory references to
 339    functions being called, in `call' RTL expressions.  */
 340 #define FUNCTION_MODE QImode
 341
 342 /* The register number of the stack pointer register, which must also
 343    be a fixed register according to `FIXED_REGISTERS'.  */
 344 #define STACK_POINTER_REGNUM MOXIE_SP
 345
 346 /* The register number of the frame pointer register, which is used to
 347    access automatic variables in the stack frame.  */
 348 #define FRAME_POINTER_REGNUM MOXIE_QFP
 349
 350 /* The register number of the arg pointer register, which is used to
 351    access the function's argument list.  */
 352 #define ARG_POINTER_REGNUM MOXIE_QAP
 353
 354 #define HARD_FRAME_POINTER_REGNUM MOXIE_FP
 355
 356 #define ELIMINABLE_REGS                                                 \
 357 {{ FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM },                   \
 358  { ARG_POINTER_REGNUM,   HARD_FRAME_POINTER_REGNUM }}
 359
 360 /* This macro returns the initial difference between the specified pair
 361    of registers.  */
 362 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 363   do {                                                                  \
 364     (OFFSET) = moxie_initial_elimination_offset ((FROM), (TO));         \
 365   } while (0)
 366
 367 /* A C expression that is nonzero if REGNO is the number of a hard
 368    register in which function arguments are sometimes passed.  */
 369 #define FUNCTION_ARG_REGNO_P(r) (r >= MOXIE_R0 && r <= MOXIE_R5)
 370
 371 /* A macro whose definition is the name of the class to which a valid
 372    base register must belong.  A base register is one used in an
 373    address which is the register value plus a displacement.  */
 374 #define BASE_REG_CLASS GENERAL_REGS
 375
 376 #define INDEX_REG_CLASS NO_REGS
 377
 378 #define HARD_REGNO_OK_FOR_BASE_P(NUM) \
 379   ((unsigned) (NUM) < FIRST_PSEUDO_REGISTER \
 380    && (REGNO_REG_CLASS(NUM) == GENERAL_REGS \
 381        || (NUM) == HARD_FRAME_POINTER_REGNUM))
 382
 383 /* A C expression which is nonzero if register number NUM is suitable
 384    for use as a base register in operand addresses.  */
 385 #ifdef REG_OK_STRICT
 386 #define REGNO_OK_FOR_BASE_P(NUM)                 \
 387   (HARD_REGNO_OK_FOR_BASE_P(NUM)                 \
 388    || HARD_REGNO_OK_FOR_BASE_P(reg_renumber[(NUM)]))
 389 #else
 390 #define REGNO_OK_FOR_BASE_P(NUM)                 \
 391   ((NUM) >= FIRST_PSEUDO_REGISTER || HARD_REGNO_OK_FOR_BASE_P(NUM))
 392 #endif
 393
 394 /* A C expression which is nonzero if register number NUM is suitable
 395    for use as an index register in operand addresses.  */
 396 #define REGNO_OK_FOR_INDEX_P(NUM) MOXIE_FP
 397
 398 /* The maximum number of bytes that a single instruction can move
 399    quickly between memory and registers or between two memory
 400    locations.  */
 401 #define MOVE_MAX 4
 402
 403 /* All load operations zero extend.  */
 404 #define LOAD_EXTEND_OP(MEM) ZERO_EXTEND
 405
 406 /* A number, the maximum number of registers that can appear in a
 407    valid memory address.  */
 408 #define MAX_REGS_PER_ADDRESS 1
 409
 410 /* An alias for a machine mode name.  This is the machine mode that
 411    elements of a jump-table should have.  */
 412 #define CASE_VECTOR_MODE SImode
 413
 414 /* Run-time Target Specification */
 415
 416 #define TARGET_CPU_CPP_BUILTINS() \
 417   { \
 418     builtin_define_std ("moxie");                       \
 419     builtin_define_std ("MOXIE");                       \
 420     if (TARGET_LITTLE_ENDIAN)                           \
 421       builtin_define ("__MOXIE_LITTLE_ENDIAN__");       \
 422     else                                                \
 423       builtin_define ("__MOXIE_BIG_ENDIAN__");          \
 424   }
 425
 426 #define HAS_LONG_UNCOND_BRANCH true
 427
 428 #endif /* GCC_MOXIE_H */