gcc/config/mmix/mmix.h

   1 /* Definitions of target machine for GNU compiler, for MMIX.
   2    Copyright (C) 2000-2017 Free Software Foundation, Inc.
   3    Contributed by Hans-Peter Nilsson (hp@bitrange.com)
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public 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_MMIX_H
  22 #define GCC_MMIX_H
  23
  24 /* First, some local helper macros.  Note that the "default" value of
  25    FIXED_REGISTERS, CALL_USED_REGISTERS, REG_ALLOC_ORDER and
  26    REG_CLASS_CONTENTS depend on these values.  */
  27 #define MMIX_RESERVED_GNU_ARG_0_REGNUM 231
  28 #define MMIX_FIRST_ARG_REGNUM \
  29   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 16)
  30 #define MMIX_FIRST_INCOMING_ARG_REGNUM \
  31   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
  32 #define MMIX_MAX_ARGS_IN_REGS 16
  33
  34 /* FIXME: This one isn't fully implemented yet.  Return values larger than
  35    one register are passed by reference in MMIX_STRUCT_VALUE_REGNUM by the
  36    caller, except for return values of type "complex".  */
  37 #define MMIX_MAX_REGS_FOR_VALUE 16
  38 #define MMIX_RETURN_VALUE_REGNUM \
  39   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 15)
  40 #define MMIX_OUTGOING_RETURN_VALUE_REGNUM \
  41   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
  42 #define MMIX_STRUCT_VALUE_REGNUM 251
  43 #define MMIX_STATIC_CHAIN_REGNUM 252
  44 #define MMIX_FRAME_POINTER_REGNUM 253
  45 #define MMIX_STACK_POINTER_REGNUM 254
  46 #define MMIX_LAST_GENERAL_REGISTER 255
  47 #define MMIX_INCOMING_RETURN_ADDRESS_REGNUM MMIX_rJ_REGNUM
  48 #define MMIX_HIMULT_REGNUM 258
  49 #define MMIX_REMAINDER_REGNUM MMIX_rR_REGNUM
  50 #define MMIX_ARG_POINTER_REGNUM 261
  51 #define MMIX_rO_REGNUM 262
  52 #define MMIX_LAST_STACK_REGISTER_REGNUM 31
  53
  54 /* Four registers; "ideally, these registers should be call-clobbered", so
  55    just grab a bunch of the common clobbered registers.  FIXME: Last
  56    registers of return-value should be used, with an error if there's a
  57    return-value (that collides in size).  */
  58 #define MMIX_EH_RETURN_DATA_REGNO_START (MMIX_STRUCT_VALUE_REGNUM - 4)
  59
  60 /* Try to keep the definitions from running away on their own.  */
  61 #if (MMIX_EH_RETURN_DATA_REGNO_START \
  62      != MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS)
  63  #error MMIX register definition inconsistency
  64 #endif
  65
  66 #if (MMIX_MAX_REGS_FOR_VALUE + MMIX_MAX_ARGS_IN_REGS > 32)
  67  #error MMIX parameters and return values bad, more than 32 registers
  68 #endif
  69
  70 /* This chosen as "a call-clobbered hard register that is otherwise
  71    untouched by the epilogue".  */
  72 #define MMIX_EH_RETURN_STACKADJ_REGNUM MMIX_STATIC_CHAIN_REGNUM
  73
  74 #define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \
  75  ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE))
  76
  77 /* Per-function machine data.  This is normally an opaque type just
  78    defined and used in the tm.c file, but we need to see the definition in
  79    mmix.md too.  */
  80 struct GTY(()) machine_function
  81  {
  82    int has_landing_pad;
  83    int highest_saved_stack_register;
  84    int in_prologue;
  85  };
  86
  87 /* For these target macros, there is no generic documentation here.  You
  88    should read `Using and Porting GCC' for that.  Only comments specific
  89    to the MMIX target are here.
  90
  91    There are however references to the specific texinfo node (comments
  92    with "Node:"), so there should be little or nothing amiss.  Probably
  93    the opposite, since we don't have to care about old littering and
  94    soon outdated generic comments.  */
  95
  96 /* Node: Driver */
  97
  98 /* User symbols are in the same name-space as built-in symbols, but we
  99    don't need the built-in symbols, so remove those and instead apply
 100    stricter operand checking.  Don't warn when expanding insns.  */
 101 #define ASM_SPEC "-no-predefined-syms -x"
 102
 103 /* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
 104    Provide default program start 0x100 unless -mno-set-program-start.
 105    Don't do this if linking relocatably, with -r.  For a final link,
 106    produce mmo, unless ELF is requested or when linking relocatably.  */
 107 #define LINK_SPEC \
 108  "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
 109   %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
 110   %{!mset-program-start=*:\
 111     %{!mno-set-program-start:\
 112      %{!r:--defsym __.MMIX.start..text=0x100}}}\
 113   %{!melf:%{!r:-m mmo}}%{melf|r:-m elf64mmix}"
 114
 115 /* FIXME: There's no provision for profiling here.  */
 116 #define STARTFILE_SPEC  \
 117   "crti%O%s crtbegin%O%s"
 118
 119 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
 120
 121 /* Node: Run-time Target */
 122
 123 /* Define __LONG_MAX__, since we're advised not to change glimits.h.  */
 124 #define TARGET_CPU_CPP_BUILTINS()                               \
 125   do                                                            \
 126     {                                                           \
 127       builtin_define ("__mmix__");                              \
 128       builtin_define ("__MMIX__");                              \
 129       if (TARGET_ABI_GNU)                                       \
 130         builtin_define ("__MMIX_ABI_GNU__");                    \
 131       else                                                      \
 132         builtin_define ("__MMIX_ABI_MMIXWARE__");               \
 133     }                                                           \
 134   while (0)
 135
 136 #define TARGET_DEFAULT \
 137  (MASK_BRANCH_PREDICT | MASK_BASE_ADDRESSES | MASK_USE_RETURN_INSN)
 138
 139
 140 /* Node: Per-Function Data */
 141 #define INIT_EXPANDERS mmix_init_expanders ()
 142
 143
 144 /* Node: Storage Layout */
 145 /* I see no bit-field instructions.  Anyway, the common order is from low
 146    to high, as the power of two, hence little-endian.  */
 147 #define BITS_BIG_ENDIAN 0
 148 #define BYTES_BIG_ENDIAN 1
 149 #define WORDS_BIG_ENDIAN 1
 150 #define FLOAT_WORDS_BIG_ENDIAN 1
 151 #define UNITS_PER_WORD 8
 152
 153 /* We need to align everything to 64 bits that can affect the alignment
 154    of other types.  Since address N is interpreted in MMIX as (N modulo
 155    access_size), we must align.  */
 156 #define PARM_BOUNDARY 64
 157 #define STACK_BOUNDARY 64
 158 #define FUNCTION_BOUNDARY 32
 159 #define BIGGEST_ALIGNMENT 64
 160
 161 /* This one is only used in the ADA front end.  */
 162 #define MINIMUM_ATOMIC_ALIGNMENT 8
 163
 164 /* Copied from elfos.h.  */
 165 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 166
 167 #define DATA_ABI_ALIGNMENT(TYPE, BASIC_ALIGN) \
 168  mmix_data_alignment (TYPE, BASIC_ALIGN)
 169
 170 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
 171  mmix_local_alignment (TYPE, BASIC_ALIGN)
 172
 173 /* Following other ports, this seems to most commonly be the word-size,
 174    so let's do that here too.  */
 175 #define EMPTY_FIELD_BOUNDARY 64
 176
 177 /* We chose to have this low solely for similarity with the alpha.  It has
 178    nothing to do with passing the tests dg/c99-scope-2 and
 179    execute/align-1.c.  Nothing.  Though the tests seem wrong.  Padding of
 180    the structure is automatically added to get alignment when needed if we
 181    set this to just byte-boundary.  */
 182 #define STRUCTURE_SIZE_BOUNDARY 8
 183
 184 /* The lower bits are ignored.  */
 185 #define STRICT_ALIGNMENT 1
 186
 187
 188 /* Node: Type Layout */
 189
 190 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
 191    but then an occasional MMIX programmer needs to know how to put a lot
 192    of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
 193    than the "intuitive" char, short and int types.  */
 194 #define INT_TYPE_SIZE 32
 195 #define SHORT_TYPE_SIZE 16
 196 #define LONG_LONG_TYPE_SIZE 64
 197
 198 #define FLOAT_TYPE_SIZE 32
 199 #define DOUBLE_TYPE_SIZE 64
 200 #define LONG_DOUBLE_TYPE_SIZE 64
 201
 202 #define DEFAULT_SIGNED_CHAR 1
 203
 204
 205 /* Node: Register Basics */
 206 /* We tell GCC about all 256 general registers, and we also include
 207    rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
 208    clobber them.  We use a faked register for the argument pointer.  It is
 209    always eliminated towards the frame-pointer or the stack-pointer, never
 210    output in assembly.  Any fixed register would do for this, like $255,
 211    but future debugging is easier when using a separate register.  It
 212    counts as a global register for pseudorandom reasons.  */
 213 #define FIRST_PSEUDO_REGISTER 263
 214
 215 /* We treat general registers with no assigned purpose as fixed.  The
 216    stack pointer, $254, is also fixed.  Register $255 is referred to as a
 217    temporary register in the MMIX papers, and used as such in mmixal, so
 218    it should not be used as a stack pointer.  We set it to fixed, and use
 219    it "manually" at times of despair.  */
 220 #define FIXED_REGISTERS \
 221  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 222    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 223    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 224    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 225    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 226    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 227    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 228    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 229    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 230    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 231    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 232    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 233    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 234    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 235    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 236    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
 237    1, 1, 0, 0, 0, 1, 1 \
 238  }
 239
 240 /* General registers are fixed and therefore "historically" marked
 241    call-used.  (FIXME: This has changed).  Registers $15..$31 are
 242    call-clobbered; we'll put arguments in $16 and up, and we need $15 for
 243    the MMIX register-stack "hole".  */
 244 #define CALL_USED_REGISTERS \
 245  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \
 246    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 247    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 248    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 249    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 250    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 251    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 252    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 253    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 254    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 255    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 256    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 257    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 258    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 259    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 260    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
 261    1, 1, 1, 1, 1, 1, 1 \
 262  }
 263
 264 #define INCOMING_REGNO(OUT) mmix_opposite_regno (OUT, 0)
 265
 266 #define OUTGOING_REGNO(IN) mmix_opposite_regno (IN, 1)
 267
 268 /* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
 269    else GCC will be confused that those registers aren't saved and
 270    restored.  */
 271 #define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
 272
 273 /* Node: Allocation Order */
 274
 275 /* We should allocate registers from 0 to 31 by increasing number, because
 276    I think that's what people expect.  Beyond that, just use
 277    call-clobbered global registers first, then call-clobbered special
 278    registers.  Last, the fixed registers.  */
 279 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER       \
 280  { 0, 1, 2, 3, 4, 5, 6, 7,                      \
 281    8, 9, 10, 11, 12, 13, 14, 15,                \
 282    16, 17, 18, 19, 20, 21, 22, 23,              \
 283    24, 25, 26, 27, 28, 29, 30, 31,              \
 284                                                 \
 285    252, 251, 250, 249, 248, 247,                \
 286                                                 \
 287    253,                                         \
 288                                                 \
 289    258, 260, 259,                               \
 290                                                 \
 291    32, 33, 34, 35, 36, 37, 38, 39,              \
 292    40, 41, 42, 43, 44, 45, 46, 47,              \
 293    48, 49, 50, 51, 52, 53, 54, 55,              \
 294    56, 57, 58, 59, 60, 61, 62, 63,              \
 295    64, 65, 66, 67, 68, 69, 70, 71,              \
 296    72, 73, 74, 75, 76, 77, 78, 79,              \
 297    80, 81, 82, 83, 84, 85, 86, 87,              \
 298    88, 89, 90, 91, 92, 93, 94, 95,              \
 299    96, 97, 98, 99, 100, 101, 102, 103,          \
 300    104, 105, 106, 107, 108, 109, 110, 111,      \
 301    112, 113, 114, 115, 116, 117, 118, 119,      \
 302    120, 121, 122, 123, 124, 125, 126, 127,      \
 303    128, 129, 130, 131, 132, 133, 134, 135,      \
 304    136, 137, 138, 139, 140, 141, 142, 143,      \
 305    144, 145, 146, 147, 148, 149, 150, 151,      \
 306    152, 153, 154, 155, 156, 157, 158, 159,      \
 307    160, 161, 162, 163, 164, 165, 166, 167,      \
 308    168, 169, 170, 171, 172, 173, 174, 175,      \
 309    176, 177, 178, 179, 180, 181, 182, 183,      \
 310    184, 185, 186, 187, 188, 189, 190, 191,      \
 311    192, 193, 194, 195, 196, 197, 198, 199,      \
 312    200, 201, 202, 203, 204, 205, 206, 207,      \
 313    208, 209, 210, 211, 212, 213, 214, 215,      \
 314    216, 217, 218, 219, 220, 221, 222, 223,      \
 315    224, 225, 226, 227, 228, 229, 230, 231,      \
 316    232, 233, 234, 235, 236, 237, 238, 239,      \
 317    240, 241, 242, 243, 244, 245, 246,           \
 318                                                 \
 319    254, 255, 256, 257, 261, 262                 \
 320  }
 321
 322 /* As a convenience, we put this nearby, for ease of comparison.
 323    First, call-clobbered registers in reverse order of assignment as
 324    parameters (also the top ones; not because they're parameters, but
 325    for continuity).
 326
 327    Second, saved registers that go on the register-stack.
 328
 329    Third, special registers rH, rR and rJ.  They should not normally be
 330    allocated, but since they're call-clobbered, it is cheaper to use one
 331    of them than using a call-saved register for a call-clobbered use,
 332    assuming it is referenced a very limited number of times.  Other global
 333    and fixed registers come next; they are never allocated.  */
 334 #define MMIX_GNU_ABI_REG_ALLOC_ORDER            \
 335  { 252, 251, 250, 249, 248, 247, 246,           \
 336    245, 244, 243, 242, 241, 240, 239, 238,      \
 337    237, 236, 235, 234, 233, 232, 231,           \
 338                                                 \
 339    0, 1, 2, 3, 4, 5, 6, 7,                      \
 340    8, 9, 10, 11, 12, 13, 14, 15,                \
 341    16, 17, 18, 19, 20, 21, 22, 23,              \
 342    24, 25, 26, 27, 28, 29, 30, 31,              \
 343                                                 \
 344    253,                                         \
 345                                                 \
 346    258, 260, 259,                               \
 347                                                 \
 348    32, 33, 34, 35, 36, 37, 38, 39,              \
 349    40, 41, 42, 43, 44, 45, 46, 47,              \
 350    48, 49, 50, 51, 52, 53, 54, 55,              \
 351    56, 57, 58, 59, 60, 61, 62, 63,              \
 352    64, 65, 66, 67, 68, 69, 70, 71,              \
 353    72, 73, 74, 75, 76, 77, 78, 79,              \
 354    80, 81, 82, 83, 84, 85, 86, 87,              \
 355    88, 89, 90, 91, 92, 93, 94, 95,              \
 356    96, 97, 98, 99, 100, 101, 102, 103,          \
 357    104, 105, 106, 107, 108, 109, 110, 111,      \
 358    112, 113, 114, 115, 116, 117, 118, 119,      \
 359    120, 121, 122, 123, 124, 125, 126, 127,      \
 360    128, 129, 130, 131, 132, 133, 134, 135,      \
 361    136, 137, 138, 139, 140, 141, 142, 143,      \
 362    144, 145, 146, 147, 148, 149, 150, 151,      \
 363    152, 153, 154, 155, 156, 157, 158, 159,      \
 364    160, 161, 162, 163, 164, 165, 166, 167,      \
 365    168, 169, 170, 171, 172, 173, 174, 175,      \
 366    176, 177, 178, 179, 180, 181, 182, 183,      \
 367    184, 185, 186, 187, 188, 189, 190, 191,      \
 368    192, 193, 194, 195, 196, 197, 198, 199,      \
 369    200, 201, 202, 203, 204, 205, 206, 207,      \
 370    208, 209, 210, 211, 212, 213, 214, 215,      \
 371    216, 217, 218, 219, 220, 221, 222, 223,      \
 372    224, 225, 226, 227, 228, 229, 230,           \
 373                                                 \
 374    254, 255, 256, 257, 261, 262                 \
 375  }
 376
 377 /* The default one.  */
 378 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
 379
 380 /* Node: Leaf Functions */
 381 /* (empty) */
 382
 383
 384 /* Node: Register Classes */
 385
 386 enum reg_class
 387  {
 388    NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
 389    SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
 390  };
 391
 392 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 393
 394 #define REG_CLASS_NAMES                                         \
 395  {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG",     \
 396   "SYSTEM_REGS", "ALL_REGS"}
 397
 398 /* Note that the contents of each item is always 32 bits.  */
 399 #define REG_CLASS_CONTENTS                      \
 400  {{0, 0, 0, 0, 0, 0, 0, 0, 0},                  \
 401   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20},       \
 402   {0, 0, 0, 0, 0, 0, 0, 0, 0x10},               \
 403   {0, 0, 0, 0, 0, 0, 0, 0, 4},                  \
 404   {0, 0, 0, 0, 0, 0, 0, 0, 0x7f},               \
 405   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
 406
 407 #define REGNO_REG_CLASS(REGNO)                                  \
 408  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 409   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 410   ? GENERAL_REGS                                                \
 411   : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG            \
 412   : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
 413
 414 #define BASE_REG_CLASS GENERAL_REGS
 415
 416 #define INDEX_REG_CLASS GENERAL_REGS
 417
 418 #define REGNO_OK_FOR_BASE_P(REGNO)                              \
 419  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 420   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 421   || (reg_renumber[REGNO] > 0                                   \
 422       && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
 423
 424 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
 425
 426 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
 427  mmix_secondary_reload_class (CLASS, MODE, X, 1)
 428
 429 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
 430  mmix_secondary_reload_class (CLASS, MODE, X, 0)
 431
 432 #define CLASS_MAX_NREGS(CLASS, MODE) targetm.hard_regno_nregs (CLASS, MODE)
 433
 434
 435 /* Node: Frame Layout */
 436
 437 #define STACK_GROWS_DOWNWARD 1
 438 #define FRAME_GROWS_DOWNWARD 1
 439
 440 #define FIRST_PARM_OFFSET(FUNDECL) 0
 441
 442 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
 443  mmix_dynamic_chain_address (FRAMEADDR)
 444
 445 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented.  */
 446
 447 #define SETUP_FRAME_ADDRESSES() \
 448  mmix_setup_frame_addresses ()
 449
 450 #define RETURN_ADDR_RTX(COUNT, FRAME)           \
 451  mmix_return_addr_rtx (COUNT, FRAME)
 452
 453 /* It's in rJ before we store it somewhere.  */
 454 #define INCOMING_RETURN_ADDR_RTX \
 455  gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 456
 457 /* FIXME: This does not seem properly documented or cross-indexed.
 458    Nowhere except in the code does it say it *has* to be in the range
 459    0..255, or else it will be truncated.  That goes for the default too.  */
 460 #define DWARF_FRAME_RETURN_COLUMN \
 461  DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 462
 463 /* No return address is stored there.  */
 464 #define INCOMING_FRAME_SP_OFFSET 0
 465
 466 /* Node: Stack Checking */
 467 /* (empty) */
 468
 469
 470 /* Node: Exception Handling */
 471
 472 #define EH_RETURN_DATA_REGNO(N) \
 473  mmix_eh_return_data_regno (N)
 474
 475 #define EH_RETURN_STACKADJ_RTX \
 476  mmix_eh_return_stackadj_rtx ()
 477
 478 #define EH_RETURN_HANDLER_RTX \
 479  mmix_eh_return_handler_rtx ()
 480
 481 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 482  mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
 483
 484 /* Node: Frame Registers */
 485 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
 486
 487 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
 488    what register we want to use.  */
 489 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
 490 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
 491
 492 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
 493
 494
 495 /* Node: Elimination */
 496
 497 /* The frame-pointer is stored in a location that either counts to the
 498    offset of incoming parameters, or that counts to the offset of the
 499    frame, so we can't use a single offset.  We therefore eliminate those
 500    two separately.  */
 501 #define ELIMINABLE_REGS                         \
 502  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 503   {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
 504   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
 505
 506 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 507  (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
 508
 509
 510 /* Node: Stack Arguments */
 511
 512 #define ACCUMULATE_OUTGOING_ARGS 1
 513
 514
 515 /* Node: Register Arguments */
 516
 517 typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
 518
 519 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 520  ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
 521
 522 #define FUNCTION_ARG_REGNO_P(REGNO)             \
 523  mmix_function_arg_regno_p (REGNO, 0)
 524
 525
 526 /* Node: Caller Saves */
 527 /* (empty) */
 528
 529
 530 /* Node: Function Entry */
 531
 532 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
 533    TARGET_ASM_FUNCTION_EPILOGUE.  */
 534
 535 /* We need to say that the epilogue uses the return address, so the
 536    initial-value machinery restores it.  FIXME: Some targets
 537    conditionalize on "reload_completed &&".  Investigate difference.
 538    FIXME: Not needed if nonlocal_goto_stack_level.  */
 539 #define EPILOGUE_USES(REGNO) \
 540  ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 541
 542 /* Node: Profiling */
 543 #define FUNCTION_PROFILER(FILE, LABELNO)        \
 544  mmix_function_profiler (FILE, LABELNO)
 545
 546 /* Node: Trampolines */
 547
 548 #define TRAMPOLINE_SIZE         (4*UNITS_PER_WORD)
 549 #define TRAMPOLINE_ALIGNMENT    BITS_PER_WORD
 550
 551 /* Node: Addressing Modes */
 552
 553 #define CONSTANT_ADDRESS_P(X) \
 554  mmix_constant_address_p (X)
 555
 556 #define MAX_REGS_PER_ADDRESS 2
 557
 558
 559 /* Node: Condition Code */
 560
 561 #define SELECT_CC_MODE(OP, X, Y)                \
 562  mmix_select_cc_mode (OP, X, Y)
 563
 564 /* A definition of CANONICALIZE_COMPARISON that changed LE and GT
 565    comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
 566    comparisons with 256 to 255 and LE, LEU, GT and GTU has been
 567    ineffective; the code path for performing the changes did not trig for
 568    neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
 569    itself (core GCC functionality supposedly handling it) with sources
 570    from 2002-06-06.  */
 571
 572 #define REVERSIBLE_CC_MODE(MODE)                \
 573  mmix_reversible_cc_mode (MODE)
 574
 575
 576 /* Node: Costs */
 577
 578 #define SLOW_BYTE_ACCESS 0
 579
 580
 581 /* Node: Sections */
 582
 583 /* This must be a constant string, since it's used in crtstuff.c.  */
 584 #define TEXT_SECTION_ASM_OP \
 585  "\t.text ! mmixal:= 9H LOC 8B"
 586
 587 /* FIXME: Not documented.  */
 588 #define DATA_SECTION_ASM_OP \
 589  mmix_data_section_asm_op ()
 590
 591 #define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
 592
 593 /* Node: PIC */
 594 /* (empty) */
 595
 596
 597 /* Node: File Framework */
 598
 599 /* While any other punctuation character but ";" would do, we prefer "%"
 600    or "!"; "!" is an unary operator and so will not be mistakenly included
 601    in correctly formed expressions.  The hash character adds mass; catches
 602    the eye.  We can't have it as a comment char by itself, since it's a
 603    hex-number prefix.  */
 604 #define ASM_COMMENT_START "!#"
 605
 606 /* These aren't currently functional.  We just keep them as markers.  */
 607 #define ASM_APP_ON "%APP\n"
 608 #define ASM_APP_OFF "%NO_APP\n"
 609
 610 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
 611  mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
 612
 613 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
 614
 615 /* Node: Data Output */
 616
 617 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
 618  mmix_asm_output_ascii (STREAM, PTR, LEN)
 619
 620 /* Node: Uninitialized Data */
 621
 622 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
 623  mmix_asm_output_aligned_common (ST, N, S, A)
 624
 625 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
 626  mmix_asm_output_aligned_local (ST, N, S, A)
 627
 628
 629 /* Node: Label Output */
 630
 631 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
 632  mmix_asm_output_label (STREAM, NAME)
 633
 634 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, NAME) \
 635  mmix_asm_output_internal_label (STREAM, NAME)
 636
 637 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
 638  mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
 639
 640 #define GLOBAL_ASM_OP "\t.global "
 641
 642 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
 643  mmix_asm_weaken_label (STREAM, NAME)
 644
 645 #define MAKE_DECL_ONE_ONLY(DECL) \
 646  mmix_make_decl_one_only (DECL)
 647
 648 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
 649  mmix_asm_output_labelref (STREAM, NAME)
 650
 651 /* We insert a ":" to disambiguate against user symbols like L5.  */
 652 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 653  sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
 654
 655 /* Insert "::"; these are rarer than internal labels.  FIXME: Make sure no
 656    ":" is seen in the object file; we don't really want that mmixal
 657    feature visible there.  We don't want the default, which uses a dot;
 658    that'd be incompatible with mmixal.  */
 659 #define ASM_PN_FORMAT "%s::%lu"
 660
 661 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
 662  mmix_asm_output_def (STREAM, NAME, VALUE)
 663
 664 /* Node: Macros for Initialization */
 665 /* We're compiling to ELF and linking to MMO; fundamental ELF features
 666    that GCC depend on are there.  */
 667
 668 /* These must be constant strings, since they're used in crtstuff.c.  */
 669 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
 670
 671 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
 672
 673 #define OBJECT_FORMAT_ELF
 674
 675
 676 /* Node: Instruction Output */
 677
 678 /* The non-$ register names must be prefixed with ":", since they're
 679    affected by PREFIX.  We provide the non-colon names as additional
 680    names.  */
 681 #define REGISTER_NAMES                                                  \
 682  {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",                       \
 683   "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",                 \
 684   "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",               \
 685   "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31",               \
 686   "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39",               \
 687   "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47",               \
 688   "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55",               \
 689   "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63",               \
 690   "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71",               \
 691   "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79",               \
 692   "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87",               \
 693   "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95",               \
 694   "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103",           \
 695   "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111",       \
 696   "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119",       \
 697   "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127",       \
 698   "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135",       \
 699   "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143",       \
 700   "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151",       \
 701   "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159",       \
 702   "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167",       \
 703   "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175",       \
 704   "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183",       \
 705   "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191",       \
 706   "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199",       \
 707   "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207",       \
 708   "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215",       \
 709   "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223",       \
 710   "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231",       \
 711   "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239",       \
 712   "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247",       \
 713   "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255",       \
 714   ":rD",  ":rE",  ":rH",  ":rJ",  ":rR",  "ap_!BAD!", ":rO"}
 715
 716 #define ADDITIONAL_REGISTER_NAMES                       \
 717  {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257},  \
 718   {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
 719
 720 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
 721  mmix_asm_output_reg_push (STREAM, REGNO)
 722
 723 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
 724  mmix_asm_output_reg_pop (STREAM, REGNO)
 725
 726
 727 /* Node: Dispatch Tables */
 728
 729 /* We define both types, since SImode is the better, but DImode the only
 730    possible for mmixal so that's the one actually used.  */
 731 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
 732  mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
 733
 734 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
 735  mmix_asm_output_addr_vec_elt (STREAM, VALUE)
 736
 737
 738 /* Node: Exception Region Output */
 739 /* (empty) */
 740
 741 /* Node: Alignment Output */
 742
 743 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
 744  mmix_asm_output_skip (STREAM, NBYTES)
 745
 746 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
 747  mmix_asm_output_align (STREAM, POWER)
 748
 749
 750 /* Node: All Debuggers */
 751
 752 #define DBX_REGISTER_NUMBER(REGNO) \
 753  mmix_dbx_register_number (REGNO)
 754
 755
 756 /* Node: DBX Options */
 757 /* (empty) */
 758 /* Node: DBX Hooks */
 759 /* (empty) */
 760 /* Node: File Names and DBX */
 761 /* (empty) */
 762
 763
 764 /* Node: SDB and DWARF */
 765 #define DWARF2_DEBUGGING_INFO 1
 766 #define DWARF2_ASM_LINE_DEBUG_INFO 1
 767
 768 /* Node: Misc */
 769
 770 /* There's no way to get a PC-relative offset into tables for SImode, so
 771    for the moment we have absolute entries in DImode.
 772    When we're going ELF, these should be SImode and 1.  */
 773 #define CASE_VECTOR_MODE DImode
 774 #define CASE_VECTOR_PC_RELATIVE 0
 775
 776 #define WORD_REGISTER_OPERATIONS 1
 777
 778 /* We have a choice, which makes this yet another parameter to tweak.  The
 779    gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
 780    than "unsigned int", and we have signed characters.  FIXME: measure.  */
 781 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
 782
 783 #define MOVE_MAX 8
 784
 785 /* ??? MMIX allows a choice of STORE_FLAG_VALUE.  Revisit later,
 786    we don't have scc expanders yet.  */
 787
 788 #define Pmode DImode
 789
 790 #define FUNCTION_MODE QImode
 791
 792 #define NO_IMPLICIT_EXTERN_C
 793
 794 /* mmix-knuth-mmixware target has no support of C99 runtime */
 795 #undef TARGET_LIBC_HAS_FUNCTION
 796 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
 797
 798 /* These are checked.  */
 799 #define DOLLARS_IN_IDENTIFIERS 0
 800 #define NO_DOLLAR_IN_LABEL
 801 #define NO_DOT_IN_LABEL
 802
 803 #endif /* GCC_MMIX_H */
 804 /*
 805  * Local variables:
 806  * eval: (c-set-style "gnu")
 807  * indent-tabs-mode: t
 808  * End:
 809  */