gcc/config/cris/cris.h

   1 /* Definitions for GCC.  Part of the machine description for CRIS.
   2    Copyright (C) 1998-2024 Free Software Foundation, Inc.
   3    Contributed by Axis Communications.  Written by Hans-Peter Nilsson.
   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 /* After the first "Node:" comment comes all preprocessor directives and
  22    attached declarations described in the info files, the "Using and
  23    Porting GCC" manual (uapgcc), in the same order as found in the "Target
  24    macros" section in the gcc-2.9x CVS edition of 2000-03-17.  FIXME: Not
  25    really, but needs an update anyway.
  26
  27    There is no generic copy-of-uapgcc comment, you'll have to see uapgcc
  28    for that.  If applicable, there is a CRIS-specific comment.  The order
  29    of macro definitions follow the order in the manual.  Every section in
  30    the manual (node in the info pages) has an introductory `Node:
  31    <subchapter>' comment.  If no macros are defined for a section, only
  32    the section-comment is present.  */
  33
  34 /* Note that other header files (e.g. config/elfos.h, config/linux.h,
  35    and config/cris/linux.h) are responsible for lots of settings not
  36    repeated below.  This file contains general CRIS definitions
  37    and definitions for the cris-*-elf subtarget.  */
  38
  39 /* We don't want to use gcc_assert for everything, as that can be
  40    compiled out.  */
  41 #define CRIS_ASSERT(x) \
  42  do { if (!(x)) internal_error ("CRIS-port assertion failed: %s", #x); } while (0)
  43
  44 /* Replacement for REG_P since it does not match SUBREGs.  Happens for
  45    testcase Axis-20000320 with gcc-2.9x.  */
  46 #define REG_S_P(x) \
  47  (REG_P (x) || (GET_CODE (x) == SUBREG && REG_P (XEXP (x, 0))))
  48
  49 /* Last register in main register bank r0..r15.  */
  50 #define CRIS_LAST_GENERAL_REGISTER 15
  51
  52 /* Descriptions of registers used for arguments.  */
  53 #define CRIS_FIRST_ARG_REG 10
  54 #define CRIS_MAX_ARGS_IN_REGS 4
  55
  56 /* See also *_REGNUM constants in cris.md.  */
  57
  58 /* Most of the time, we need the index into the register-names array.
  59    When passing debug-info, we need the real hardware register number.  */
  60 #define CRIS_CANONICAL_SRP_REGNUM (16 + 11)
  61 #define CRIS_CANONICAL_MOF_REGNUM (16 + 7)
  62 /* We have CCR in all models including v10, but that's 16 bits, so let's
  63    prefer the DCCR number, which is a DMA pointer in pre-v8, so we'll
  64    never clash with it for GCC purposes.  */
  65 #define CRIS_CANONICAL_CC0_REGNUM (16 + 13)
  66
  67 #define CRIS_FUNCTION_ARG_SIZE(MODE, TYPE)      \
  68   ((MODE) != BLKmode ? GET_MODE_SIZE (MODE)     \
  69    : (unsigned) int_size_in_bytes (TYPE))
  70
  71 /* Which CPU version this is.  The parsed and adjusted cris_cpu_str.  */
  72 extern int cris_cpu_version;
  73
  74
  75 /* Node: Driver */
  76
  77 /* Also provide canonical vN definitions when user specifies an alias.  */
  78
  79 #define CPP_SPEC \
  80  "%{mtune=*:-D__tune_%* %{mtune=v*:-D__CRIS_arch_tune=%*}\
  81    %{mtune=etrax4:-D__tune_v3 -D__CRIS_arch_tune=3}\
  82    %{mtune=etrax100:-D__tune_v8 -D__CRIS_arch_tune=8}\
  83    %{mtune=svinto:-D__tune_v8 -D__CRIS_arch_tune=8}\
  84    %{mtune=etrax100lx:-D__tune_v10 -D__CRIS_arch_tune=10}\
  85    %{mtune=ng:-D__tune_v10 -D__CRIS_arch_tune=10}}\
  86   %{mcpu=*:-D__arch_%* %{mcpu=v*:-D__CRIS_arch_version=%*}\
  87    %{mcpu=etrax4:-D__arch_v3 -D__CRIS_arch_version=3}\
  88    %{mcpu=etrax100:-D__arch_v8 -D__CRIS_arch_version=8}\
  89    %{mcpu=svinto:-D__arch_v8 -D__CRIS_arch_version=8}\
  90    %{mcpu=etrax100lx:-D__arch_v10 -D__CRIS_arch_version=10}\
  91    %{mcpu=ng:-D__arch_v10 -D__CRIS_arch_version=10}}\
  92   %{march=*:-D__arch_%* %{march=v*:-D__CRIS_arch_version=%*}\
  93    %{march=etrax4:-D__arch_v3 -D__CRIS_arch_version=3}\
  94    %{march=etrax100:-D__arch_v8 -D__CRIS_arch_version=8}\
  95    %{march=svinto:-D__arch_v8 -D__CRIS_arch_version=8}\
  96    %{march=etrax100lx:-D__arch_v10 -D__CRIS_arch_version=10}\
  97    %{march=ng:-D__arch_v10 -D__CRIS_arch_version=10}}\
  98   %{metrax100:-D__arch__v8 -D__CRIS_arch_version=8}\
  99   %{metrax4:-D__arch__v3 -D__CRIS_arch_version=3}\
 100   %(cpp_subtarget)"
 101
 102 /* For the cris-*-elf subtarget.  */
 103
 104 #define CRIS_DEFAULT_TUNE "10"
 105 #define CRIS_ARCH_CPP_DEFAULT
 106 #define CRIS_DEFAULT_ASM_ARCH_OPTION ""
 107
 108 #ifdef TARGET_CPU_DEFAULT
 109 #if TARGET_CPU_DEFAULT != 10
 110  #error "Due to '()'; e.g. '#define TARGET_CPU_DEFAULT (10)', stringize TARGET_CPU_DEFAULT isn't useful: update manually."
 111 #endif
 112
 113 #undef CRIS_ARCH_CPP_DEFAULT
 114 #define CRIS_ARCH_CPP_DEFAULT \
 115  "%{!march=*:\
 116    %{!metrax*:\
 117     %{!mcpu=*:\
 118      %{!mtune=*:-D__tune_v" CRIS_DEFAULT_TUNE "}\
 119      -D__arch_v" CRIS_DEFAULT_TUNE \
 120    " -D__CRIS_arch_version=" CRIS_DEFAULT_TUNE "}}}"
 121 #endif
 122
 123 #define CRIS_CPP_SUBTARGET_SPEC \
 124  "%{mbest-lib-options:\
 125    %{!moverride-best-lib-options:\
 126    %{!march=*:%{!metrax*:%{!mcpu=*:\
 127       -D__tune_v" CRIS_DEFAULT_TUNE \
 128     " -D__CRIS_arch_tune=" CRIS_DEFAULT_TUNE "}}}}}"\
 129  CRIS_ARCH_CPP_DEFAULT
 130
 131 /* Override previous definitions (../linux.h).  */
 132 #undef CC1_SPEC
 133 #define CC1_SPEC \
 134  "%{metrax4:-march=v3}\
 135   %{metrax100:-march=v8}\
 136   %{march=*:-march=%*}\
 137   %{mcpu=*:-mcpu=%*}\
 138   %(cc1_subtarget)"
 139
 140 /* For the cris-*-elf subtarget.  */
 141 #define CRIS_CC1_SUBTARGET_SPEC \
 142  "-melf\
 143   %{mbest-lib-options:\
 144    %{!moverride-best-lib-options:\
 145    %{!march=*:%{!mcpu=*:-mtune=v" CRIS_DEFAULT_TUNE\
 146        " -D__CRIS_arch_tune=" CRIS_DEFAULT_TUNE "}}\
 147     %{!finhibit-size-directive:\
 148       %{!fno-function-sections: -ffunction-sections}\
 149       %{!fno-data-sections: -fdata-sections}}}}"
 150
 151 /* This adds to CC1_SPEC.  */
 152 #define CC1PLUS_SPEC ""
 153
 154 #ifdef HAVE_AS_NO_MUL_BUG_ABORT_OPTION
 155 #define MAYBE_AS_NO_MUL_BUG_ABORT \
 156  "%{mno-mul-bug-workaround:-no-mul-bug-abort} " \
 157  "%{mmul-bug-workaround:-mul-bug-abort} " \
 158  "%{!mmul-bug-workaround:%{!mno-mul-bug-workaround:" MUL_BUG_ASM_DEFAULT "}} "
 159 #else
 160 #define MAYBE_AS_NO_MUL_BUG_ABORT
 161 #endif
 162
 163 /* Override previous definitions (../linux.h).  */
 164 #undef ASM_SPEC
 165 #define ASM_SPEC \
 166  MAYBE_AS_NO_MUL_BUG_ABORT \
 167  "%(asm_subtarget)\
 168  %{march=*:%{mcpu=*:%edo not specify both -march=... and -mcpu=...}}\
 169  %{march=v0|mcpu=v0|march=v3|mcpu=v3|march=v8|mcpu=v8:--march=v0_v10}\
 170  %{march=v10|mcpu=v10:--march=v10}"
 171
 172 /* For the cris-*-elf subtarget.  */
 173 #define CRIS_ASM_SUBTARGET_SPEC \
 174  "--em=criself %{!march=*:%{!mcpu=*:" CRIS_DEFAULT_ASM_ARCH_OPTION "}}"
 175
 176 /* FIXME: We should propagate the -melf option to make the criself
 177    "emulation" unless a linker script is provided (-T*), but I don't know
 178    how to do that if either of -Ttext, -Tdata or -Tbss is given but no
 179    linker script, as is usually the case.  Leave it to the user for the
 180    time being.  */
 181 #undef LINK_SPEC
 182 #define LINK_SPEC \
 183  "%{v:--verbose}\
 184   %(link_subtarget)"
 185
 186 /* For the cris-*-elf subtarget.  */
 187 #define CRIS_LINK_SUBTARGET_SPEC \
 188  "-mcriself\
 189   %{sim2:%{!T*:-Tdata 0x4000000 -Tbss 0x8000000}}\
 190   %{!r:%{O2|O3: --gc-sections}}"
 191
 192 /* Which library to get.  The simulator uses a different library for
 193    the low-level syscalls (implementing the Linux syscall ABI instead
 194    of direct-iron accesses).  Default everything with the stub "nosys"
 195    library.  */
 196 /* Override previous definitions (linux.h).  */
 197 #undef LIB_SPEC
 198 #define LIB_SPEC \
 199  "%{sim*:--start-group -lc -lsyslinux --end-group}\
 200   %{!sim*:%{g*:-lg}\
 201     %{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} -lbsp}\
 202   -lnosys"
 203
 204 /* Linker startfile options; crt0 flavors.
 205    We need to remove any previous definition (elfos.h).  */
 206 #undef STARTFILE_SPEC
 207 #define STARTFILE_SPEC \
 208  "%{sim*:crt1.o%s}%{!sim*:crt0.o%s}\
 209   crti.o%s crtbegin.o%s"
 210
 211 #undef ENDFILE_SPEC
 212 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
 213
 214 #define EXTRA_SPECS                             \
 215   {"cpp_subtarget", CRIS_CPP_SUBTARGET_SPEC},   \
 216   {"cc1_subtarget", CRIS_CC1_SUBTARGET_SPEC},   \
 217   {"asm_subtarget", CRIS_ASM_SUBTARGET_SPEC},   \
 218   {"link_subtarget", CRIS_LINK_SUBTARGET_SPEC}, \
 219   CRIS_SUBTARGET_EXTRA_SPECS
 220
 221 #define CRIS_SUBTARGET_EXTRA_SPECS
 222
 223
 224 /* Node: Run-time Target */
 225
 226 #define TARGET_CPU_CPP_BUILTINS()               \
 227   do                                            \
 228     {                                           \
 229       builtin_define_std ("cris");              \
 230       builtin_define_std ("CRIS");              \
 231       builtin_define_std ("GNU_CRIS");          \
 232       builtin_define ("__CRIS_ABI_version=2");  \
 233       builtin_assert ("cpu=cris");              \
 234       builtin_assert ("machine=cris");          \
 235     }                                           \
 236   while (0)
 237
 238 /* For the cris-*-elf subtarget.  */
 239 #define CRIS_SUBTARGET_DEFAULT 0
 240
 241 #define CRIS_CPU_BASE 0
 242 #define CRIS_CPU_ETRAX4 3       /* Just lz added.  */
 243 #define CRIS_CPU_SVINTO 8       /* Added swap, jsrc & Co., 32-bit accesses.  */
 244 #define CRIS_CPU_NG 10          /* Added mul[su].  */
 245
 246 #ifndef TARGET_CPU_DEFAULT
 247 #define TARGET_CPU_DEFAULT CRIS_CPU_BASE
 248 #endif
 249
 250 /* Default target_flags if no switches specified.
 251    The alignment-by-32 is to make builtin atomic support for v10
 252    work for *-elf for types without specified alignment (like plain
 253    "int").  See top comment in sync.md.  */
 254 #ifndef TARGET_DEFAULT
 255 # if TARGET_CPU_DEFAULT == 10
 256 #  define TARGET_DEFAULT \
 257  (MASK_SIDE_EFFECT_PREFIXES + MASK_STACK_ALIGN \
 258   + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
 259   + MASK_ALIGN_BY_32 \
 260   + MASK_PROLOGUE_EPILOGUE)
 261 # else  /* 0 */
 262 #  define TARGET_DEFAULT \
 263  (MASK_SIDE_EFFECT_PREFIXES + MASK_STACK_ALIGN \
 264   + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
 265   + MASK_PROLOGUE_EPILOGUE)
 266 # endif
 267 #endif
 268
 269 /* Don't depend on the assembler default setting for the errata machinery;
 270    always pass the option to turn it on or off explicitly.  But, we have to
 271    decide on which is the *GCC* default, and for that we should only need to
 272    consider what's in TARGET_DEFAULT; no other changes should be necessary.  */
 273
 274 #if (TARGET_DEFAULT & MASK_MUL_BUG)
 275 #define MUL_BUG_ASM_DEFAULT "-mul-bug-abort"
 276 #else
 277 #define MUL_BUG_ASM_DEFAULT "-no-mul-bug-abort"
 278 #endif
 279
 280 /* Local, providing a default for cris_cpu_version.  */
 281 #define CRIS_DEFAULT_CPU_VERSION TARGET_CPU_DEFAULT
 282
 283 #define TARGET_HAS_MUL_INSNS (cris_cpu_version >= CRIS_CPU_NG)
 284 #define TARGET_HAS_LZ (cris_cpu_version >= CRIS_CPU_ETRAX4)
 285 #define TARGET_HAS_BREAK (cris_cpu_version >= CRIS_CPU_ETRAX4)
 286 #define TARGET_HAS_SWAP (cris_cpu_version >= CRIS_CPU_SVINTO)
 287
 288 /* The "break" instruction was introduced with ETRAX 4.  */
 289 #define TARGET_TRAP_USING_BREAK8 \
 290  (cris_trap_using_break8 == 2 ? TARGET_HAS_BREAK : cris_trap_using_break8)
 291
 292 /* This condition controls whether to expand atomics inline or call
 293    library functions. */
 294 #define TARGET_ATOMICS_MAY_CALL_LIBFUNCS                \
 295  (cris_atomics_calling_libfunc != 2 && cris_atomics_calling_libfunc != 0)
 296
 297 /* The < v10 atomics turn off interrupts, so they don't need alignment.
 298    Incidentally, by default alignment is off there causing variables to
 299    be default unaligned all over, so we'd have to make support
 300    libraries use a proper atomic type (instead of "int"), one we'd
 301    specify as aligned.  */
 302 #define TARGET_TRAP_UNALIGNED_ATOMIC            \
 303  (cris_trap_unaligned_atomic == 2               \
 304   ? cris_cpu_version == 10                      \
 305   : cris_trap_unaligned_atomic)
 306
 307 /* Node: Storage Layout */
 308
 309 #define BITS_BIG_ENDIAN 0
 310
 311 #define BYTES_BIG_ENDIAN 0
 312
 313 /* WORDS_BIG_ENDIAN is not defined in the hardware, but for consistency,
 314    we use little-endianness, and we may also be able to use
 315    post-increment on DImode indirect.  */
 316 #define WORDS_BIG_ENDIAN 0
 317
 318 #define UNITS_PER_WORD 4
 319
 320 #define CRIS_PROMOTED_MODE(MODE, UNSIGNEDP, TYPE) \
 321  (GET_MODE_CLASS (MODE) == MODE_INT && GET_MODE_SIZE (MODE) < 4) \
 322   ? SImode : MODE
 323
 324 /* We will be using prototype promotion, so they will be 32 bit.  */
 325 #define PARM_BOUNDARY 32
 326
 327 /* Stack boundary is guided by -mstack-align, -mno-stack-align,
 328    -malign.
 329    Old comment: (2.1: still valid in 2.7.2?)
 330     Note that to make this macro affect the alignment of stack
 331    locals, a fix was required, and special precautions when handling
 332    the stack pointer in various other macros (TARGET_ASM_FUNCTION_PROLOGUE
 333    et al) were required.  See file "function.cc".  If you would just define
 334    this macro, it would only affect the builtin alloca and variable
 335    local data (non-ANSI, non-K&R, Gnu C extension).  */
 336 #define STACK_BOUNDARY \
 337  (TARGET_STACK_ALIGN ? (TARGET_ALIGN_BY_32 ? 32 : 16) : 8)
 338
 339 #define FUNCTION_BOUNDARY 16
 340
 341 /* Do not change BIGGEST_ALIGNMENT (when optimizing), as it will affect
 342    strange places, at least in 2.1.  */
 343 #define BIGGEST_ALIGNMENT 8
 344
 345 /* If -m16bit,  -m16-bit, -malign or -mdata-align,
 346    align everything to 16 bit.  */
 347 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN)                       \
 348  (TARGET_DATA_ALIGN                                             \
 349   ? (TARGET_ALIGN_BY_32                                         \
 350      ? (BASIC_ALIGN < 32 ? 32 : BASIC_ALIGN)                    \
 351      : (BASIC_ALIGN < 16 ? 16 : BASIC_ALIGN)) : BASIC_ALIGN)
 352
 353 /* FIXME: Define LOCAL_ALIGNMENT for word and dword or arrays and
 354    structures (if -mstack-align=), and check that it is good.  */
 355
 356 #define EMPTY_FIELD_BOUNDARY 8
 357
 358 #define STRUCTURE_SIZE_BOUNDARY 8
 359
 360 #define STRICT_ALIGNMENT 0
 361
 362 /* Remove any previous definition (elfos.h).
 363    ??? If it wasn't for all the other stuff that affects layout of
 364    structures and bit-fields, this could presumably cause incompatibility
 365    with other GNU/Linux ports (i.e. elfos.h users).  */
 366 #undef PCC_BITFIELD_TYPE_MATTERS
 367
 368
 369 /* Node: Type Layout */
 370
 371 /* Note that DOUBLE_TYPE_SIZE is not defined anymore, since the default
 372    value gives a 64-bit double, which is what we now use.  */
 373
 374 /* For compatibility and historical reasons, a char should be signed.  */
 375 #define DEFAULT_SIGNED_CHAR 1
 376
 377 /* Note that WCHAR_TYPE_SIZE is used in cexp.y,
 378    where TARGET_SHORT is not available.  */
 379 #undef WCHAR_TYPE
 380 #define WCHAR_TYPE "long int"
 381
 382 #undef WCHAR_TYPE_SIZE
 383 #define WCHAR_TYPE_SIZE 32
 384
 385
 386 /* Node: Register Basics */
 387
 388 /*  We count all 16 non-special registers, SRP, a faked argument
 389     pointer register, MOF, CCR/DCCR, and the faked frame-pointer.  */
 390 #define FIRST_PSEUDO_REGISTER (16 + 1 + 1 + 1 + 1 + 1)
 391
 392 /* For CRIS, these are r15 (pc) and r14 (sp). Register r8 is used as a
 393    frame-pointer, but is not fixed.  SRP is not included in general
 394    registers and will not be used automatically.  All other special
 395    registers are fixed at the moment.  The faked argument pointer register
 396    is fixed too.  */
 397 #define FIXED_REGISTERS \
 398  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1}
 399
 400 /* Register r9 is used for structure-address, r10-r13 for parameters,
 401    r10- for return values.  */
 402 #define CALL_USED_REGISTERS \
 403  {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1}
 404
 405 /* Node: Allocation Order */
 406
 407 /* We need this on CRIS, because call-used regs should be used first,
 408    (so we don't need to push).  Else start using registers from r0 and up.
 409     This preference is mainly because if we put call-used-regs from r0
 410    and up, then we can't use movem to push the rest, (which have to be
 411    saved if we use them, and movem has to start with r0).
 412    Change here if you change which registers to use as call registers.
 413
 414    The actual need to explicitly prefer call-used registers improved the
 415    situation a lot for 2.1, but might not actually be needed anymore.
 416    Still, this order reflects what GCC should find out by itself, so it
 417    probably does not hurt.
 418
 419    Order of preference: Call-used-regs first, then r0 and up, last fp &
 420    sp & pc as fillers.
 421    Call-used regs in opposite order, so they will cause less conflict if
 422    a function has few args (<= 3) and it wants a scratch reg.
 423     Use struct-return address first, since very few functions use
 424    structure return values so it is likely to be available.  */
 425 #define REG_ALLOC_ORDER \
 426  {9, 13, 12, 11, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 14, 15, 17, 16, 18, 19, \
 427   20}
 428
 429
 430 /* Node: Leaf Functions */
 431 /* (no definitions) */
 432
 433 /* Node: Stack Registers */
 434 /* (no definitions) */
 435
 436
 437 /* Node: Register Classes */
 438
 439 /* It's not obvious, but having subunions of all movable-between
 440    register classes does really help register allocation (pre-IRA
 441    comment).  */
 442 enum reg_class
 443   {
 444     NO_REGS,
 445     MOF_REGS, SRP_REGS, CC0_REGS,
 446     MOF_SRP_REGS, SPECIAL_REGS,
 447     GENERAL_REGS,
 448     ALL_REGS,
 449     LIM_REG_CLASSES
 450   };
 451
 452 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 453
 454 #define REG_CLASS_NAMES                                         \
 455   {"NO_REGS",                                                   \
 456    "MOF_REGS", "SRP_REGS", "CC0_REGS",                          \
 457    "MOF_SRP_REGS", "SPECIAL_REGS",                              \
 458    "GENERAL_REGS", "ALL_REGS"}
 459
 460 #define CRIS_SPECIAL_REGS_CONTENTS                                      \
 461  ((1 << CRIS_SRP_REGNUM) | (1 << CRIS_MOF_REGNUM) | (1 << CRIS_CC0_REGNUM))
 462
 463 #define CRIS_FAKED_REGS_CONTENTS \
 464  ((1 << CRIS_AP_REGNUM) | (1 << CRIS_FP_REGNUM))
 465
 466 /* Count in the faked argument register in GENERAL_REGS.  Keep out SRP.  */
 467 #define REG_CLASS_CONTENTS                      \
 468   {                                             \
 469    {0},                                         \
 470    {1 << CRIS_MOF_REGNUM},                      \
 471    {1 << CRIS_SRP_REGNUM},                      \
 472    {1 << CRIS_CC0_REGNUM},                      \
 473    {(1 << CRIS_MOF_REGNUM)                      \
 474     | (1 << CRIS_SRP_REGNUM)},                  \
 475    {CRIS_SPECIAL_REGS_CONTENTS},                \
 476    {0xffff | CRIS_FAKED_REGS_CONTENTS},         \
 477    {0xffff | CRIS_FAKED_REGS_CONTENTS           \
 478     | CRIS_SPECIAL_REGS_CONTENTS}               \
 479   }
 480
 481 #define REGNO_REG_CLASS(REGNO)                  \
 482   ((REGNO) == CRIS_MOF_REGNUM ? MOF_REGS :      \
 483    (REGNO) == CRIS_SRP_REGNUM ? SRP_REGS :      \
 484    (REGNO) == CRIS_CC0_REGNUM ? CC0_REGS :      \
 485    GENERAL_REGS)
 486
 487 #define BASE_REG_CLASS GENERAL_REGS
 488
 489 #define INDEX_REG_CLASS GENERAL_REGS
 490
 491 /* Since it uses reg_renumber, it is safe only once reg_renumber
 492    has been allocated, which happens in reginfo.cc during register
 493    allocation.  */
 494 #define REGNO_OK_FOR_BASE_P(REGNO)                                      \
 495  ((REGNO) <= CRIS_LAST_GENERAL_REGISTER                                 \
 496   || (REGNO) == FRAME_POINTER_REGNUM                                    \
 497   || (REGNO) == ARG_POINTER_REGNUM                                      \
 498   || (unsigned) reg_renumber[REGNO] <= CRIS_LAST_GENERAL_REGISTER       \
 499   || (unsigned) reg_renumber[REGNO] == FRAME_POINTER_REGNUM             \
 500   || (unsigned) reg_renumber[REGNO] == ARG_POINTER_REGNUM)
 501
 502 /* See REGNO_OK_FOR_BASE_P.  */
 503 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P(REGNO)
 504
 505 /* We can't move special registers to and from memory in smaller than
 506    word_mode.  We also can't move between special registers.  Luckily,
 507    -1, as returned by true_regnum for non-sub/registers, is valid as a
 508    parameter to our REGNO_REG_CLASS, returning GENERAL_REGS, so we get
 509    the effect that any X that isn't a special-register is treated as
 510    a non-empty intersection with GENERAL_REGS.  */
 511 #define SECONDARY_RELOAD_CLASS(CLASS, MODE, X)                          \
 512  ((reg_class_subset_p (CLASS, SPECIAL_REGS)                             \
 513    && ((GET_MODE_SIZE (MODE) < 4 && MEM_P (X))                          \
 514        || !reg_classes_intersect_p (REGNO_REG_CLASS (true_regnum (X)),  \
 515                                     GENERAL_REGS)))                     \
 516    ? GENERAL_REGS : NO_REGS)
 517
 518 /* For CRIS, this is always the size of MODE in words,
 519    since all registers are the same size.  To use omitted modes in
 520    patterns with reload constraints, you must say the widest size
 521    which is allowed for VOIDmode.
 522    FIXME:  Does that still apply for gcc-2.9x?  Keep poisoned until such
 523    patterns are added back.  News: 2001-03-16: Happens as early as the
 524    underscore-test.  */
 525 #define CLASS_MAX_NREGS(CLASS, MODE)                                    \
 526  ((MODE) == VOIDmode                                                    \
 527   ? 1 /* + cris_fatal ("CLASS_MAX_NREGS with VOIDmode") */              \
 528   : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
 529
 530
 531 /* Node: Frame Layout */
 532
 533 #define STACK_GROWS_DOWNWARD 1
 534 #define FRAME_GROWS_DOWNWARD 1
 535
 536 #define FIRST_PARM_OFFSET(FNDECL) 0
 537
 538 #define RETURN_ADDR_RTX(COUNT, FRAMEADDR) \
 539  cris_return_addr_rtx (COUNT, FRAMEADDR)
 540
 541 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, CRIS_SRP_REGNUM)
 542
 543 /* FIXME: Any __builtin_eh_return callers must not return anything and
 544    there must not be collisions with incoming parameters.  Luckily the
 545    number of __builtin_eh_return callers is limited.  For now return
 546    parameter registers in reverse order and hope for the best.  */
 547 #define EH_RETURN_DATA_REGNO(N) \
 548   (IN_RANGE ((N), 0, 3) ? (CRIS_FIRST_ARG_REG + 3 - (N)) : INVALID_REGNUM)
 549
 550 /* Store the stack adjustment in the structure-return-address register.  */
 551 #define CRIS_STACKADJ_REG CRIS_STRUCT_VALUE_REGNUM
 552 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (SImode, CRIS_STACKADJ_REG)
 553
 554 #define EH_RETURN_HANDLER_RTX cris_eh_return_handler_rtx ()
 555
 556 #define INIT_EXPANDERS cris_init_expanders ()
 557
 558 /* FIXME: Move this to right node (it's not documented properly yet).  */
 559 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (CRIS_SRP_REGNUM)
 560
 561 /* FIXME: Move this to right node (it's not documented properly yet).
 562    FIXME: Check what alignment we can assume regarding
 563    TARGET_STACK_ALIGN and TARGET_ALIGN_BY_32.  */
 564 #define DWARF_CIE_DATA_ALIGNMENT -1
 565
 566 /* If we would ever need an exact mapping between canonical register
 567    number and dwarf frame register, we would either need to include all
 568    registers in the gcc description (with some marked fixed of course), or
 569    an inverse mapping from dwarf register to gcc register.  There is one
 570    need in dwarf2out.cc:expand_builtin_init_dwarf_reg_sizes.  Right now, I
 571    don't see that we need exact correspondence between DWARF *frame*
 572    registers and DEBUGGER_REGNO, so map them onto GCC registers.  */
 573 #define DWARF_FRAME_REGNUM(REG) (REG)
 574
 575 /* Node: Stack Checking */
 576 /* (no definitions) FIXME: Check.  */
 577
 578 /* Node: Frame Registers */
 579
 580 #define STACK_POINTER_REGNUM CRIS_SP_REGNUM
 581
 582 /* Register used for frame pointer.  This is also the last of the saved
 583    registers, when a frame pointer is not used.  */
 584 #define HARD_FRAME_POINTER_REGNUM CRIS_REAL_FP_REGNUM
 585
 586 /* Faked register, is always eliminated to at least CRIS_REAL_FP_REGNUM.  */
 587 #define FRAME_POINTER_REGNUM CRIS_FP_REGNUM
 588
 589 /* Faked register, is always eliminated.  We need it to eliminate
 590    allocating stack slots for the return address and the frame pointer.  */
 591 #define ARG_POINTER_REGNUM CRIS_AP_REGNUM
 592
 593 #define STATIC_CHAIN_REGNUM CRIS_STATIC_CHAIN_REGNUM
 594
 595 /* No unwind context is needed for faked registers nor DCCR.  Currently not MOF
 596    too, but let's keep that open.  */
 597 #define DWARF_FRAME_REGISTERS (CRIS_MOF_REGNUM + 1)
 598
 599 /* Node: Elimination */
 600
 601 #define ELIMINABLE_REGS                         \
 602  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 603   {ARG_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM},      \
 604   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
 605   {FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}}
 606
 607 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 608  (OFFSET) = cris_initial_elimination_offset (FROM, TO)
 609
 610
 611 /* Node: Stack Arguments */
 612
 613 /* Since many parameters take up one register each in any case,
 614    defining TARGET_PROMOTE_PROTOTYPES that always returns true would
 615    seem like a good idea, but measurements indicate that a combination
 616    using PROMOTE_MODE is better.  */
 617
 618 #define ACCUMULATE_OUTGOING_ARGS 1
 619
 620
 621 /* Node: Register Arguments */
 622
 623 /* Contrary to what you'd believe, defining FUNCTION_ARG_CALLEE_COPIES
 624    seems like a (small total) loss, at least for gcc-2.7.2 compiling and
 625    running gcc-2.1 (small win in size, small loss running -- 100.1%),
 626    and similarly for size for products (.1 .. .3% bloat, sometimes win).
 627    Due to the empirical likeliness of making slower code, it is not
 628    defined.  */
 629
 630 /* This no longer *needs* to be a structure; but keeping it as such should
 631    not hurt (and hacking the ABI is simpler).  */
 632 #define CUMULATIVE_ARGS struct cum_args
 633 struct cum_args {int regs;};
 634
 635 /* The regs member is an integer, the number of arguments got into
 636    registers so far.  */
 637 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 638  ((CUM).regs = 0)
 639
 640 #define FUNCTION_ARG_REGNO_P(REGNO)                     \
 641  ((REGNO) >= CRIS_FIRST_ARG_REG                         \
 642   && (REGNO) < CRIS_FIRST_ARG_REG + (CRIS_MAX_ARGS_IN_REGS))
 643
 644
 645 /* Node: Aggregate Return */
 646
 647 #define CRIS_STRUCT_VALUE_REGNUM ((CRIS_FIRST_ARG_REG) - 1)
 648
 649
 650 /* Node: Caller Saves */
 651 /* (no definitions) */
 652
 653 /* Node: Function entry */
 654
 655 /* See cris.cc for TARGET_ASM_FUNCTION_PROLOGUE and
 656    TARGET_ASM_FUNCTION_EPILOGUE.  */
 657
 658 /* Node: Profiling */
 659
 660 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 661  error ("no %<FUNCTION_PROFILER%> for CRIS")
 662
 663 /* FIXME: Some of the undefined macros might be mandatory.  If so, fix
 664    documentation.  */
 665
 666
 667 /* Node: Trampolines */
 668
 669 #define TRAMPOLINE_SIZE 32
 670
 671 /* CRIS wants instructions on word-boundary.  */
 672 #define TRAMPOLINE_ALIGNMENT 16
 673
 674 /* Node: Library Calls */
 675
 676 /* If you change this, you have to check whatever libraries and systems
 677    that use it.  */
 678 #define TARGET_EDOM 33
 679
 680
 681 /* Node: Addressing Modes */
 682
 683 #define HAVE_POST_INCREMENT 1
 684
 685 #define CONSTANT_ADDRESS_P(X) \
 686   (CONSTANT_P (X) && cris_legitimate_address_p (QImode, X, false))
 687
 688 #define MAX_REGS_PER_ADDRESS 2
 689
 690 /* Fix reloads known to cause suboptimal spilling.  */
 691 #define LEGITIMIZE_RELOAD_ADDRESS(X, MODE, OPNUM, TYPE, INDL, WIN)      \
 692   do                                                                    \
 693     {                                                                   \
 694       if (cris_reload_address_legitimized (X, MODE, OPNUM, TYPE, INDL)) \
 695         goto WIN;                                                       \
 696     }                                                                   \
 697   while (0)
 698
 699
 700 /* Node: Condition Code */
 701
 702 /* FIXME: Maybe define TARGET_CANONICALIZE_COMPARISON later, when
 703    playing with optimizations.  */
 704
 705 #define SELECT_CC_MODE(op, x, y) cris_select_cc_mode(op, x, y)
 706
 707 #define REVERSIBLE_CC_MODE(MODE) true
 708
 709 /* No known need to define REVERSE_CONDITION, the default is good.  */
 710
 711 /* Node: Costs */
 712
 713 /* Regardless of the presence of delay slots, the default value of 1 for
 714    BRANCH_COST is the best in the range (1, 2, 3), tested with gcc-2.7.2
 715    with testcases ipps and gcc, giving smallest and fastest code.  */
 716
 717 #define SLOW_BYTE_ACCESS 0
 718
 719 /* This is the threshold *below* which inline move sequences of
 720    word-length sizes will be emitted.  The "9" will translate to
 721    (9 - 1) * 4 = 32 bytes maximum moved, but using 16 instructions
 722    (8 instruction sequences) or less.  */
 723 #define MOVE_RATIO(speed) 9
 724
 725
 726 /* Node: Sections */
 727
 728 #define TEXT_SECTION_ASM_OP "\t.text"
 729
 730 #define DATA_SECTION_ASM_OP "\t.data"
 731
 732 /* The jump table is immediately connected to the preceding insn.  */
 733 #define JUMP_TABLES_IN_TEXT_SECTION 1
 734
 735
 736 /* Node: File Framework */
 737
 738 /* We don't want an .ident for gcc.  To avoid that but still support
 739    #ident, we override TARGET_ASM_OUTPUT_IDENT and, since the gcc .ident
 740    is its only use besides front-end .ident directives, we return if
 741    the state if the cgraph is not PARSING.  */
 742 #undef TARGET_ASM_OUTPUT_IDENT
 743 #define TARGET_ASM_OUTPUT_IDENT cris_asm_output_ident
 744
 745 #define ASM_APP_ON "#APP\n"
 746
 747 #define ASM_APP_OFF "#NO_APP\n"
 748
 749
 750 /* Node: Data Output */
 751
 752 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) (C) == '@'
 753
 754 /* Node: Uninitialized Data */
 755
 756 /* Remember to round off odd values if we want data alignment,
 757    since we cannot do that with an .align directive.
 758
 759    Using .comm causes the space not to be reserved in .bss, but by
 760    tricks with the symbol type.  Not good if other tools than binutils
 761    are used on the object files.  Since ".global ... .lcomm ..." works, we
 762    use that.  Use .._ALIGNED_COMMON, since gcc whines when we only have
 763    ..._COMMON, and we prefer to whine ourselves; BIGGEST_ALIGNMENT is not
 764    the one to check.  */
 765 /* FIXME: I suspect a bug in gcc with alignment.  Do not warn until
 766    investigated; it mucks up the testsuite results.  */
 767 #define CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, LOCAL) \
 768   do                                                                    \
 769     {                                                                   \
 770       int align_ = (ALIGN) / BITS_PER_UNIT;                             \
 771       if (TARGET_DATA_ALIGN && TARGET_ALIGN_BY_32 && align_ < 4)        \
 772         align_ = 4;                                                     \
 773       else if (TARGET_DATA_ALIGN && align_ < 2)                         \
 774         align_ = 2;                                                     \
 775       /* FIXME: Do we need this?  */                                    \
 776       else if (align_ < 1)                                              \
 777         align_ = 1;                                                     \
 778                                                                         \
 779       if (LOCAL)                                                        \
 780         {                                                               \
 781           fprintf ((FILE), "%s", LOCAL_ASM_OP);                         \
 782           assemble_name ((FILE), (NAME));                               \
 783           fprintf ((FILE), "\n");                                       \
 784         }                                                               \
 785       fprintf ((FILE), "%s", COMMON_ASM_OP);                            \
 786       assemble_name ((FILE), (NAME));                                   \
 787       fprintf ((FILE), ",%u,%u\n", (int)(SIZE), align_);                \
 788     }                                                                   \
 789   while (0)
 790
 791 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
 792  CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 0)
 793
 794 #undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
 795 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
 796  CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 1)
 797
 798 /* Node: Label Output */
 799
 800 /* Globalizing directive for a label.  */
 801 #define GLOBAL_ASM_OP "\t.global "
 802
 803 #define SUPPORTS_WEAK 1
 804
 805 #define ASM_OUTPUT_SYMBOL_REF(STREAM, SYM) \
 806  cris_asm_output_symbol_ref (STREAM, SYM)
 807
 808 #define ASM_OUTPUT_LABEL_REF(STREAM, BUF) \
 809  cris_asm_output_label_ref (STREAM, BUF)
 810
 811 /* Remove any previous definition (elfos.h).  */
 812 #undef ASM_GENERATE_INTERNAL_LABEL
 813 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 814   sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long) NUM)
 815
 816 /* Node: Initialization */
 817 /* (no definitions) */
 818
 819 /* Node: Macros for Initialization */
 820 /* (no definitions) */
 821
 822 /* Node: Instruction Output */
 823
 824 #define REGISTER_NAMES                                  \
 825  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", \
 826   "r9", "r10", "r11", "r12", "r13", "sp", "pc", "srp",  \
 827   "mof", "faked_ap", "dccr", "faked_fp"}
 828
 829 #define ADDITIONAL_REGISTER_NAMES \
 830  {{"r14", 14}, {"r15", 15}}
 831
 832 /* Output an empty line to illustrate the presence of the delay slot.  */
 833 #define DBR_OUTPUT_SEQEND(FILE) \
 834   fprintf (FILE, "\n")
 835
 836 #define LOCAL_LABEL_PREFIX "."
 837
 838 /* cppinit.c initializes a const array from this, so it must be constant,
 839    can't have it different based on options.  Luckily, the prefix is
 840    always allowed, so let's have it on all GCC-generated code.  Note that
 841    we have this verbatim everywhere in the back-end, not using %R or %s or
 842    such.  */
 843 #define REGISTER_PREFIX "$"
 844
 845 /* Remove any previous definition (elfos.h).  */
 846 /* We use -fno-leading-underscore to remove it, when necessary.  */
 847 #undef USER_LABEL_PREFIX
 848 #define USER_LABEL_PREFIX "_"
 849
 850 #define ASM_OUTPUT_REG_PUSH(FILE, REGNO)                                \
 851   fprintf (FILE, "\tpush $%s\n", reg_names[REGNO])
 852
 853 #define ASM_OUTPUT_REG_POP(FILE, REGNO) \
 854   fprintf (FILE, "\tmove [$sp+],$%s\n", reg_names[REGNO])
 855
 856
 857 /* Node: Dispatch Tables */
 858
 859 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL)                \
 860   asm_fprintf (FILE, "\t.word %LL%d-%LL%d\n", VALUE, REL)
 861
 862 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
 863   asm_fprintf (FILE, "\t.dword %LL%d\n", VALUE)
 864
 865 /* Defined to also emit an .align in elfos.h.  We don't want that.  */
 866 #undef ASM_OUTPUT_CASE_LABEL
 867
 868 /* Since the "bound" insn loads the comparison value if the compared<
 869    value (register) is out of bounds (0..comparison value-1), we need
 870    to output another case to catch it.
 871    The way to find it is to look for the label_ref at the else-arm inside
 872    the expanded casesi core-insn.
 873    FIXME: Check this construct when changing to new version of gcc.  */
 874 #define ASM_OUTPUT_CASE_END(STREAM, NUM, TABLE)                         \
 875   cris_asm_output_case_end (STREAM, NUM, TABLE)
 876
 877
 878 /* Node: Exception Region Output */
 879 /* (no definitions) */
 880 /* FIXME: Fill in with our own optimized layout.  */
 881
 882 /* Node: Alignment Output */
 883
 884 #define ASM_OUTPUT_ALIGN(FILE, LOG)  \
 885  fprintf (FILE, "\t.align %d\n", (LOG))
 886
 887
 888 /* Node: All Debuggers */
 889
 890 #define DEBUGGER_REGNO(REGNO)                           \
 891  ((REGNO) == CRIS_SRP_REGNUM ? CRIS_CANONICAL_SRP_REGNUM :      \
 892   (REGNO) == CRIS_MOF_REGNUM ? CRIS_CANONICAL_MOF_REGNUM :      \
 893   (REGNO) == CRIS_CC0_REGNUM ? CRIS_CANONICAL_CC0_REGNUM :      \
 894  (REGNO))
 895
 896 /* FIXME: Investigate DEBUGGER_AUTO_OFFSET, DEBUGGER_ARG_OFFSET.  */
 897
 898
 899 /* Node: DWARF */
 900 /* (no definitions) */
 901
 902 /* Node: Misc */
 903
 904 /* A combination of the bound (umin) insn together with a
 905    sign-extended add via the table to PC seems optimal.
 906    If the table overflows, the assembler will take care of it.
 907    Theoretically, in extreme cases (uncertain if they occur), an error
 908    will be emitted, so FIXME: Check how large case-tables are emitted,
 909    possible add an option to emit SImode case-tables.  */
 910 #define CASE_VECTOR_MODE HImode
 911
 912 #define CASE_VECTOR_PC_RELATIVE 1
 913
 914 /* FIXME: Investigate CASE_VECTOR_SHORTEN_MODE to make sure HImode is not
 915    used when broken-.word could possibly fail (plus testcase).  */
 916
 917 /* This is the number of bytes that can be moved in one
 918    reasonably fast instruction sequence.  For CRIS, this is two
 919    instructions: mem => reg, reg => mem.  */
 920 #define MOVE_MAX 4
 921
 922 /* Maybe SHIFT_COUNT_TRUNCATED is safe to define?  FIXME: Check later.  */
 923
 924 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
 925 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
 926
 927 #define Pmode SImode
 928
 929 #define FUNCTION_MODE QImode
 930
 931 /*
 932  * Local variables:
 933  * eval: (c-set-style "gnu")
 934  * indent-tabs-mode: t
 935  * End:
 936  */