gcc/config/ft32/ft32.h

   1 /* Target Definitions for ft32.
   2    Copyright (C) 2015-2024 Free Software Foundation, Inc.
   3    Contributed by FTDI <support@ftdi.com>
   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_FT32_H
  22 #define GCC_FT32_H
  23
  24 #undef  STARTFILE_SPEC
  25 #define STARTFILE_SPEC "crt0%O%s %{msim:crti.o%s} %{!msim:crti-hw.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                    %{mcompress:--relax} \
  43                    %{msim:-Tsim.ld}"
  44
  45 #undef  LINK_SPEC
  46 #define LINK_SPEC "%{h*} %{v:-V} \
  47                    %{static:-Bstatic} %{shared:-shared} %{symbolic:-Bsymbolic}"
  48
  49 /* Layout of Source Language Data Types */
  50
  51 #define INT_TYPE_SIZE 32
  52 #define SHORT_TYPE_SIZE 16
  53 #define LONG_TYPE_SIZE 32
  54 #define LONG_LONG_TYPE_SIZE 64
  55
  56 #define DEFAULT_SIGNED_CHAR 1
  57
  58 #undef  SIZE_TYPE
  59 #define SIZE_TYPE "unsigned int"
  60
  61 #undef  PTRDIFF_TYPE
  62 #define PTRDIFF_TYPE "int"
  63
  64 #undef  WCHAR_TYPE
  65 #define WCHAR_TYPE "long int"
  66
  67 #undef  WCHAR_TYPE_SIZE
  68 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  69
  70 #define REGISTER_NAMES {        \
  71   "$fp", "$sp", "$r0", "$r1",   \
  72   "$r2", "$r3", "$r4", "$r5",   \
  73   "$r6", "$r7", "$r8", "$r9",   \
  74   "$r10", "$r11", "$r12", "$r13",   \
  75   "$r14", "$r15", "$r16", "$r17", "$r18", "$r19", "$r20", "$r21", "$r22", "$r23", "$r24", "$r25", "$r26", "$r27", "$r28", "$cc", \
  76   "?fp", "?ap", "$pc", "?cc" }
  77
  78 #define FT32_FP     0
  79 #define FT32_SP     1
  80 #define FT32_R0     2
  81 #define FT32_R1     3
  82 #define FT32_R2     4
  83 #define FT32_R3     5
  84 #define FT32_R4     6
  85 #define FT32_R5     7
  86 #define FT32_R6     8
  87 #define FT32_R7     9
  88 #define FT32_R8     10
  89 #define FT32_R9     11
  90 #define FT32_R10    12
  91 #define FT32_R11    13
  92 #define FT32_R12    14
  93 #define FT32_R13    15
  94 #define FT32_R14    16
  95 #define FT32_R15    17
  96 #define FT32_R16    18
  97 #define FT32_R17    19
  98 #define FT32_R18    20
  99 #define FT32_R19    21
 100 #define FT32_R20    22
 101 #define FT32_R21    23
 102 #define FT32_R22    24
 103 #define FT32_R23    25
 104 #define FT32_R24    26
 105 #define FT32_R25    27
 106 #define FT32_R26    28
 107 #define FT32_R27    29
 108 #define FT32_R28    30
 109 #define FT32_R29    31
 110 #define FT32_QAP    (32 + 1)
 111 #define FT32_PC     (32 + 2)
 112 #define FT32_CC     (32 + 3)
 113 #define FIRST_PSEUDO_REGISTER (32 + 4)
 114
 115 enum reg_class
 116 {
 117   NO_REGS,
 118   GENERAL_REGS,
 119   SPECIAL_REGS,
 120   CC_REGS,
 121   ALL_REGS,
 122   LIM_REG_CLASSES
 123 };
 124
 125 #define REG_CLASS_CONTENTS \
 126 { { 0x00000000, 0x00000000 }, /* Empty */                      \
 127   { 0xFFFFFFFF, 0x00000003 }, /* $fp, $sp, $r0 to $r13, ?fp */ \
 128   { 0x00000000, 0x00000004 }, /* $pc */                        \
 129   { 0x00000000, 0x00000008 }, /* ?cc */                        \
 130   { 0xFFFFFFFF, 0x0000000F }  /* All registers */              \
 131 }
 132
 133 #define N_REG_CLASSES LIM_REG_CLASSES
 134
 135 #define REG_CLASS_NAMES {\
 136     "NO_REGS", \
 137     "GENERAL_REGS", \
 138     "SPECIAL_REGS", \
 139     "CC_REGS", \
 140     "ALL_REGS" }
 141
 142 #define FIXED_REGISTERS  /*  fp  sp  r0  r1 */   { 1, 1, 0, 0, \
 143                          /*  r2  r3  r4  r5 */     0, 0, 0, 0, \
 144                          /*  r6  r7  r8  r9 */     0, 0, 0, 0, \
 145                          /* r10 r11 r12 r13 */     0, 0, 0, 0, \
 146                          /* r14 r15 r16 r17 */     0, 0, 0, 0, \
 147                          /* r18 r19 r20 r21 */     0, 0, 0, 0, \
 148                          /* r22 r23 r24 r25 */     0, 0, 0, 0, \
 149                          /* r26 r27 r28 r29 */     0, 0, 1, 1, \
 150                          /* r30 r31         */     1, 1, 1, 1 }
 151
 152 #define CALL_USED_REGISTERS \
 153                          /*  fp  sp  r0  r1 */   { 1, 1, 1, 1, \
 154                          /*  r2  r3  r4  r5 */     1, 1, 1, 1, \
 155                          /*  r6  r7  r8  r9 */     1, 1, 1, 1, \
 156                          /* r10 r11 r12 r13 */     1, 1, 1, 0, \
 157                          /* r14 r15 r16 r17 */     0, 0, 0, 0, \
 158                          /* r18 r19 r20 r21 */     0, 0, 0, 0, \
 159                          /* r22 r23 r24 r25 */     0, 0, 0, 0, \
 160                          /* r26 r27 r28 r29 */     0, 0, 1, 1, \
 161                          /* r30 r31         */     1, 1, 1, 1 }
 162
 163 /* We can't copy to or from our CC register. */
 164 #define AVOID_CCMODE_COPIES 1
 165
 166 /* A C expression whose value is a register class containing hard
 167    register REGNO.  */
 168 #define REGNO_REG_CLASS(R) ((R < FT32_PC) ? GENERAL_REGS :                \
 169                             (R == FT32_CC ? CC_REGS : SPECIAL_REGS))
 170
 171 /* The Overall Framework of an Assembler File */
 172
 173 #undef  ASM_SPEC
 174 #define ASM_COMMENT_START "#"
 175 #define ASM_APP_ON ""
 176 #define ASM_APP_OFF ""
 177
 178 #define FILE_ASM_OP     "\t.file\n"
 179
 180 /* Switch to the text or data segment.  */
 181 #define TEXT_SECTION_ASM_OP  "\t.text"
 182 #define DATA_SECTION_ASM_OP  "\t.data"
 183
 184 /* Assembler Commands for Alignment */
 185
 186 #define ASM_OUTPUT_ALIGN(STREAM,POWER) \
 187         fprintf (STREAM, "\t.p2align\t%d\n", POWER);
 188
 189 /* A C compound statement to output to stdio stream STREAM the
 190    assembler syntax for an instruction operand X.  */
 191 #define PRINT_OPERAND(STREAM, X, CODE) ft32_print_operand (STREAM, X, CODE)
 192
 193 #define PRINT_OPERAND_ADDRESS(STREAM ,X) ft32_print_operand_address (STREAM, X)
 194
 195 /* Output and Generation of Labels */
 196
 197 #define GLOBAL_ASM_OP "\t.global\t"
 198
 199 #define JUMP_TABLES_IN_TEXT_SECTION (TARGET_NOPM ? 0 : 1)
 200
 201 /* This is how to output an element of a case-vector that is absolute.  */
 202
 203 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
 204     fprintf (FILE, "\t.long\t.L%d\n", VALUE)                            \
 205
 206 /* Passing Arguments in Registers */
 207
 208 /* A C type for declaring a variable that is used as the first
 209    argument of `FUNCTION_ARG' and other related values.  */
 210 #define CUMULATIVE_ARGS unsigned int
 211
 212 /* If defined, the maximum amount of space required for outgoing arguments
 213    will be computed and placed into the variable
 214    `current_function_outgoing_args_size'.  No space will be pushed
 215    onto the stack for each call; instead, the function prologue should
 216    increase the stack frame size by this amount.  */
 217 #define ACCUMULATE_OUTGOING_ARGS 1
 218
 219 /* A C statement (sans semicolon) for initializing the variable CUM
 220    for the state at the beginning of the argument list.
 221    For ft32, the first arg is passed in register 2 (aka $r0).  */
 222 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,FNDECL,N_NAMED_ARGS) \
 223   (CUM = FT32_R0)
 224
 225 /* How Scalar Function Values Are Returned */
 226
 227 /* STACK AND CALLING */
 228
 229 /* Define this macro if pushing a word onto the stack moves the stack
 230    pointer to a smaller address.  */
 231 #define STACK_GROWS_DOWNWARD 1
 232
 233 /* Offset from the argument pointer register to the first argument's
 234    address.  On some machines it may depend on the data type of the
 235    function.  */
 236 #define FIRST_PARM_OFFSET(F) 0
 237
 238 /* Define this macro to nonzero value if the addresses of local variable slots
 239    are at negative offsets from the frame pointer.  */
 240 #define FRAME_GROWS_DOWNWARD 1
 241
 242 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 243    the stack pointer does not matter.  The value is tested only in
 244    functions that have frame pointers.
 245    No definition is equivalent to always zero.  */
 246
 247 #define EXIT_IGNORE_STACK 0
 248
 249 /* Define this macro as a C expression that is nonzero for registers that are
 250    used by the epilogue or the return pattern.  The stack and frame
 251    pointer registers are already assumed to be used as needed.  */
 252 #define EPILOGUE_USES(R) (R == FT32_R5)
 253
 254 /* A C expression whose value is RTL representing the location of the
 255    incoming return address at the beginning of any function, before
 256    the prologue.  */
 257 #define INCOMING_RETURN_ADDR_RTX                                        \
 258   gen_frame_mem (Pmode,                                                 \
 259                  plus_constant (Pmode, stack_pointer_rtx, 333 * UNITS_PER_WORD))
 260
 261 #define RETURN_ADDR_RTX(COUNT, FRAMEADDR)                               \
 262   ((COUNT) == 0                                                         \
 263    ? gen_rtx_MEM (Pmode, gen_rtx_PLUS (Pmode, arg_pointer_rtx, GEN_INT (-4))) \
 264    : NULL_RTX)
 265
 266 /* Describe how we implement __builtin_eh_return.  */
 267 #define EH_RETURN_DATA_REGNO(N) ((N) < 4 ? (N+2) : INVALID_REGNUM)
 268
 269 /* Store the return handler into the call frame.  */
 270 #define EH_RETURN_HANDLER_RTX                                           \
 271   gen_frame_mem (Pmode,                                                 \
 272                  plus_constant (Pmode, frame_pointer_rtx, UNITS_PER_WORD))
 273
 274 /* Storage Layout */
 275
 276 #define BITS_BIG_ENDIAN 0
 277 #define BYTES_BIG_ENDIAN 0
 278 #define WORDS_BIG_ENDIAN 0
 279
 280 /* Alignment required for a function entry point, in bits.  */
 281 #define FUNCTION_BOUNDARY 32
 282
 283 #define BRANCH_COST(speed_p, predictable_p)     2
 284
 285 /* Define this macro as a C expression which is nonzero if accessing
 286    less than a word of memory (i.e. a `char' or a `short') is no
 287    faster than accessing a word of memory.  */
 288 #define SLOW_BYTE_ACCESS 1
 289
 290 #define STORE_FLAG_VALUE                        1
 291
 292 #define MOVE_RATIO(speed) ((speed) ? 6 : 2)
 293
 294 /* Number of storage units in a word; normally the size of a
 295    general-purpose register, a power of two from 1 or 8.  */
 296 #define UNITS_PER_WORD 4
 297
 298 /* Define this macro to the minimum alignment enforced by hardware
 299    for the stack pointer on this machine.  The definition is a C
 300    expression for the desired alignment (measured in bits).  */
 301 #define STACK_BOUNDARY 32
 302
 303 /* Normal alignment required for function parameters on the stack, in
 304    bits.  All stack parameters receive at least this much alignment
 305    regardless of data type.  */
 306 #define PARM_BOUNDARY 32
 307
 308 /* Alignment of field after `int : 0' in a structure.  */
 309 #define EMPTY_FIELD_BOUNDARY  32
 310
 311 /* No data type wants to be aligned rounder than this.  */
 312 #define BIGGEST_ALIGNMENT 32
 313
 314 /* The best alignment to use in cases where we have a choice.  */
 315 #define FASTEST_ALIGNMENT 32
 316
 317 /* Align definitions of arrays, unions and structures so that
 318    initializations and copies can be made more efficient.  This is not
 319    ABI-changing, so it only affects places where we can see the
 320    definition. Increasing the alignment tends to introduce padding,
 321    so don't do this when optimizing for size/conserving stack space. */
 322 #define FT32_EXPAND_ALIGNMENT(COND, EXP, ALIGN)                         \
 323   (((COND) && ((ALIGN) < BITS_PER_WORD)                                 \
 324     && (TREE_CODE (EXP) == ARRAY_TYPE                                   \
 325         || TREE_CODE (EXP) == UNION_TYPE                                \
 326         || TREE_CODE (EXP) == RECORD_TYPE)) ? BITS_PER_WORD : (ALIGN))
 327
 328 /* Make arrays of chars word-aligned for the same reasons.  */
 329 #define DATA_ALIGNMENT(TYPE, ALIGN)             \
 330   (TREE_CODE (TYPE) == ARRAY_TYPE               \
 331    && TYPE_MODE (TREE_TYPE (TYPE)) == QImode    \
 332    && (ALIGN) < FASTEST_ALIGNMENT ? FASTEST_ALIGNMENT : (ALIGN))
 333
 334 /* Similarly, make sure that objects on the stack are sensibly aligned.  */
 335 #define LOCAL_ALIGNMENT(EXP, ALIGN)                             \
 336   FT32_EXPAND_ALIGNMENT(/*!flag_conserve_stack*/ 1, EXP, ALIGN)
 337
 338 /* Every structures size must be a multiple of 8 bits.  */
 339 #define STRUCTURE_SIZE_BOUNDARY 8
 340
 341 /* Look at the fundamental type that is used for a bit-field and use
 342    that to impose alignment on the enclosing structure.
 343    struct s {int a:8}; should have same alignment as "int", not "char".  */
 344 #define PCC_BITFIELD_TYPE_MATTERS       1
 345
 346 /* Largest integer machine mode for structures.  If undefined, the default
 347    is GET_MODE_SIZE(DImode).  */
 348 #define MAX_FIXED_MODE_SIZE 32
 349
 350 /* Set this nonzero if move instructions will actually fail to work
 351    when given unaligned data.  */
 352 #define STRICT_ALIGNMENT 1
 353
 354 /* Generating Code for Profiling */
 355 #define FUNCTION_PROFILER(FILE,LABELNO) (abort (), 0)
 356
 357 /* Trampolines for Nested Functions.  */
 358 #define TRAMPOLINE_SIZE (2 + 6 + 6 + 2 + 2 + 6)
 359
 360 /* Alignment required for trampolines, in bits.  */
 361 #define TRAMPOLINE_ALIGNMENT 32
 362
 363 /* An alias for the machine mode for pointers.  */
 364 #define Pmode         SImode
 365
 366 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE) \
 367 do { \
 368   if (((MODE) == HImode) \
 369    || ((MODE) == QImode)) \
 370        (MODE) = SImode;  \
 371 } while (0)
 372
 373 /* An alias for the machine mode used for memory references to
 374    functions being called, in `call' RTL expressions.  */
 375 #define FUNCTION_MODE QImode
 376
 377 #define STATIC_CHAIN_REGNUM  FT32_R28
 378
 379 /* The register number of the stack pointer register, which must also
 380    be a fixed register according to `FIXED_REGISTERS'.  */
 381 #define STACK_POINTER_REGNUM FT32_SP
 382
 383 /* The register number of the frame pointer register, which is used to
 384    access automatic variables in the stack frame.  */
 385 #define FRAME_POINTER_REGNUM FT32_FP
 386
 387 /* The register number of the arg pointer register, which is used to
 388    access the function's argument list.  */
 389 #define ARG_POINTER_REGNUM FT32_QAP
 390
 391 #define ELIMINABLE_REGS                                 \
 392 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},            \
 393  {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},            \
 394  {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
 395
 396
 397 /* This macro returns the initial difference between the specified pair
 398    of registers.  */
 399 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 400   do {                                                                  \
 401     (OFFSET) = ft32_initial_elimination_offset ((FROM), (TO));            \
 402   } while (0)
 403
 404 /* A C expression that is nonzero if REGNO is the number of a hard
 405    register in which function arguments are sometimes passed.  */
 406 #define FUNCTION_ARG_REGNO_P(r) (r >= FT32_R0 && r <= FT32_R5)
 407
 408 /* A macro whose definition is the name of the class to which a valid
 409    base register must belong.  A base register is one used in an
 410    address which is the register value plus a displacement.  */
 411 #define BASE_REG_CLASS GENERAL_REGS
 412
 413 #define INDEX_REG_CLASS NO_REGS
 414
 415 #define HARD_REGNO_OK_FOR_BASE_P(NUM) \
 416   ((unsigned) (NUM) < FIRST_PSEUDO_REGISTER \
 417    && (REGNO_REG_CLASS(NUM) == GENERAL_REGS \
 418        || (NUM) == HARD_FRAME_POINTER_REGNUM))
 419
 420 /* A C expression which is nonzero if register number NUM is suitable
 421    for use as a base register in operand addresses.  */
 422 #ifdef REG_OK_STRICT
 423 #define REGNO_OK_FOR_BASE_P(NUM)                 \
 424   (HARD_REGNO_OK_FOR_BASE_P(NUM)                 \
 425    || HARD_REGNO_OK_FOR_BASE_P(reg_renumber[(NUM)]))
 426 #else
 427 #define REGNO_OK_FOR_BASE_P(NUM)                 \
 428   ((NUM) >= FIRST_PSEUDO_REGISTER || HARD_REGNO_OK_FOR_BASE_P(NUM))
 429 #endif
 430
 431 /* A C expression which is nonzero if register number NUM is suitable
 432    for use as an index register in operand addresses.  */
 433 #define REGNO_OK_FOR_INDEX_P(NUM) FT32_FP
 434
 435 /* The maximum number of bytes that a single instruction can move
 436    quickly between memory and registers or between two memory
 437    locations.  */
 438 #define MOVE_MAX 4
 439
 440 /* Define this to be nonzero if shift instructions ignore all but the low-order
 441    few bits.  */
 442 #define SHIFT_COUNT_TRUNCATED 1
 443
 444 /* All load operations zero extend.  */
 445 #define LOAD_EXTEND_OP(MEM) ZERO_EXTEND
 446
 447 /* A number, the maximum number of registers that can appear in a
 448    valid memory address.  */
 449 #define MAX_REGS_PER_ADDRESS 1
 450
 451 /* An alias for a machine mode name.  This is the machine mode that
 452    elements of a jump-table should have.  */
 453 #define CASE_VECTOR_MODE SImode
 454
 455 /* Run-time Target Specification */
 456
 457 #define TARGET_CPU_CPP_BUILTINS() \
 458   { \
 459     builtin_define ("__FT32__");          \
 460   }
 461
 462 #define HAS_LONG_UNCOND_BRANCH true
 463
 464 #define NO_FUNCTION_CSE 1
 465
 466 #define ADDR_SPACE_PM 1
 467
 468 #define REGISTER_TARGET_PRAGMAS() do { \
 469   c_register_addr_space ("__flash__", TARGET_NOPM ? 0 : ADDR_SPACE_PM); \
 470 } while (0)
 471
 472 extern int ft32_is_mem_pm(rtx o);
 473
 474 #define ASM_OUTPUT_SYMBOL_REF(stream, sym) \
 475   do { \
 476     assemble_name (stream, XSTR (sym, 0)); \
 477     int section_debug = in_section && \
 478       (SECTION_STYLE (in_section) == SECTION_NAMED) && \
 479       (in_section->named.common.flags & SECTION_DEBUG); \
 480     if (!section_debug && SYMBOL_REF_FLAGS (sym) & 0x1000) \
 481       asm_fprintf (stream, "-0x800000"); \
 482   } while (0)
 483
 484 #endif /* GCC_FT32_H */