gcc/config/cris/cris.h

   1 /* Definitions for GCC.  Part of the machine description for CRIS.
   2    Copyright (C) 1998-2022 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: " #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 #else
 158 #define MAYBE_AS_NO_MUL_BUG_ABORT
 159 #endif
 160
 161 /* Override previous definitions (../linux.h).  */
 162 #undef ASM_SPEC
 163 #define ASM_SPEC \
 164  MAYBE_AS_NO_MUL_BUG_ABORT \
 165  "%(asm_subtarget)\
 166  %{march=*:%{mcpu=*:%edo not specify both -march=... and -mcpu=...}}\
 167  %{march=v0|mcpu=v0|march=v3|mcpu=v3|march=v8|mcpu=v8:--march=v0_v10}\
 168  %{march=v10|mcpu=v10:--march=v10}"
 169
 170 /* For the cris-*-elf subtarget.  */
 171 #define CRIS_ASM_SUBTARGET_SPEC \
 172  "--em=criself %{!march=*:%{!mcpu=*:" CRIS_DEFAULT_ASM_ARCH_OPTION "}}"
 173
 174 /* FIXME: We should propagate the -melf option to make the criself
 175    "emulation" unless a linker script is provided (-T*), but I don't know
 176    how to do that if either of -Ttext, -Tdata or -Tbss is given but no
 177    linker script, as is usually the case.  Leave it to the user for the
 178    time being.  */
 179 #undef LINK_SPEC
 180 #define LINK_SPEC \
 181  "%{v:--verbose}\
 182   %(link_subtarget)"
 183
 184 /* For the cris-*-elf subtarget.  */
 185 #define CRIS_LINK_SUBTARGET_SPEC \
 186  "-mcriself\
 187   %{sim2:%{!T*:-Tdata 0x4000000 -Tbss 0x8000000}}\
 188   %{!r:%{O2|O3: --gc-sections}}"
 189
 190 /* Which library to get.  The simulator uses a different library for
 191    the low-level syscalls (implementing the Linux syscall ABI instead
 192    of direct-iron accesses).  Default everything with the stub "nosys"
 193    library.  */
 194 /* Override previous definitions (linux.h).  */
 195 #undef LIB_SPEC
 196 #define LIB_SPEC \
 197  "%{sim*:--start-group -lc -lsyslinux --end-group}\
 198   %{!sim*:%{g*:-lg}\
 199     %{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} -lbsp}\
 200   -lnosys"
 201
 202 /* Linker startfile options; crt0 flavors.
 203    We need to remove any previous definition (elfos.h).  */
 204 #undef STARTFILE_SPEC
 205 #define STARTFILE_SPEC \
 206  "%{sim*:crt1.o%s}%{!sim*:crt0.o%s}\
 207   crti.o%s crtbegin.o%s"
 208
 209 #undef ENDFILE_SPEC
 210 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
 211
 212 #define EXTRA_SPECS                             \
 213   {"cpp_subtarget", CRIS_CPP_SUBTARGET_SPEC},   \
 214   {"cc1_subtarget", CRIS_CC1_SUBTARGET_SPEC},   \
 215   {"asm_subtarget", CRIS_ASM_SUBTARGET_SPEC},   \
 216   {"link_subtarget", CRIS_LINK_SUBTARGET_SPEC}, \
 217   CRIS_SUBTARGET_EXTRA_SPECS
 218
 219 #define CRIS_SUBTARGET_EXTRA_SPECS
 220
 221
 222 /* Node: Run-time Target */
 223
 224 #define TARGET_CPU_CPP_BUILTINS()               \
 225   do                                            \
 226     {                                           \
 227       builtin_define_std ("cris");              \
 228       builtin_define_std ("CRIS");              \
 229       builtin_define_std ("GNU_CRIS");          \
 230       builtin_define ("__CRIS_ABI_version=2");  \
 231       builtin_assert ("cpu=cris");              \
 232       builtin_assert ("machine=cris");          \
 233     }                                           \
 234   while (0)
 235
 236 /* For the cris-*-elf subtarget.  */
 237 #define CRIS_SUBTARGET_DEFAULT 0
 238
 239 #define CRIS_CPU_BASE 0
 240 #define CRIS_CPU_ETRAX4 3       /* Just lz added.  */
 241 #define CRIS_CPU_SVINTO 8       /* Added swap, jsrc & Co., 32-bit accesses.  */
 242 #define CRIS_CPU_NG 10          /* Added mul[su].  */
 243
 244 #ifndef TARGET_CPU_DEFAULT
 245 #define TARGET_CPU_DEFAULT CRIS_CPU_BASE
 246 #endif
 247
 248 /* Default target_flags if no switches specified.
 249    The alignment-by-32 is to make builtin atomic support for v10
 250    work for *-elf for types without specified alignment (like plain
 251    "int").  See top comment in sync.md.  */
 252 #ifndef TARGET_DEFAULT
 253 # if TARGET_CPU_DEFAULT == 10
 254 #  define TARGET_DEFAULT \
 255  (MASK_SIDE_EFFECT_PREFIXES + MASK_STACK_ALIGN \
 256   + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
 257   + MASK_ALIGN_BY_32 \
 258   + MASK_PROLOGUE_EPILOGUE + MASK_MUL_BUG)
 259 # else  /* 0 */
 260 #  define TARGET_DEFAULT \
 261  (MASK_SIDE_EFFECT_PREFIXES + MASK_STACK_ALIGN \
 262   + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
 263   + MASK_PROLOGUE_EPILOGUE + MASK_MUL_BUG)
 264 # endif
 265 #endif
 266
 267 /* Local, providing a default for cris_cpu_version.  */
 268 #define CRIS_DEFAULT_CPU_VERSION TARGET_CPU_DEFAULT
 269
 270 #define TARGET_HAS_MUL_INSNS (cris_cpu_version >= CRIS_CPU_NG)
 271 #define TARGET_HAS_LZ (cris_cpu_version >= CRIS_CPU_ETRAX4)
 272 #define TARGET_HAS_BREAK (cris_cpu_version >= CRIS_CPU_ETRAX4)
 273 #define TARGET_HAS_SWAP (cris_cpu_version >= CRIS_CPU_SVINTO)
 274
 275 /* The "break" instruction was introduced with ETRAX 4.  */
 276 #define TARGET_TRAP_USING_BREAK8 \
 277  (cris_trap_using_break8 == 2 ? TARGET_HAS_BREAK : cris_trap_using_break8)
 278
 279 /* This condition controls whether to expand atomics inline or call
 280    library functions. */
 281 #define TARGET_ATOMICS_MAY_CALL_LIBFUNCS                \
 282  (cris_atomics_calling_libfunc != 2 && cris_atomics_calling_libfunc != 0)
 283
 284 /* The < v10 atomics turn off interrupts, so they don't need alignment.
 285    Incidentally, by default alignment is off there causing variables to
 286    be default unaligned all over, so we'd have to make support
 287    libraries use a proper atomic type (instead of "int"), one we'd
 288    specify as aligned.  */
 289 #define TARGET_TRAP_UNALIGNED_ATOMIC            \
 290  (cris_trap_unaligned_atomic == 2               \
 291   ? cris_cpu_version == 10                      \
 292   : cris_trap_unaligned_atomic)
 293
 294 /* Node: Storage Layout */
 295
 296 #define BITS_BIG_ENDIAN 0
 297
 298 #define BYTES_BIG_ENDIAN 0
 299
 300 /* WORDS_BIG_ENDIAN is not defined in the hardware, but for consistency,
 301    we use little-endianness, and we may also be able to use
 302    post-increment on DImode indirect.  */
 303 #define WORDS_BIG_ENDIAN 0
 304
 305 #define UNITS_PER_WORD 4
 306
 307 #define CRIS_PROMOTED_MODE(MODE, UNSIGNEDP, TYPE) \
 308  (GET_MODE_CLASS (MODE) == MODE_INT && GET_MODE_SIZE (MODE) < 4) \
 309   ? SImode : MODE
 310
 311 /* We will be using prototype promotion, so they will be 32 bit.  */
 312 #define PARM_BOUNDARY 32
 313
 314 /* Stack boundary is guided by -mstack-align, -mno-stack-align,
 315    -malign.
 316    Old comment: (2.1: still valid in 2.7.2?)
 317     Note that to make this macro affect the alignment of stack
 318    locals, a fix was required, and special precautions when handling
 319    the stack pointer in various other macros (TARGET_ASM_FUNCTION_PROLOGUE
 320    et al) were required.  See file "function.c".  If you would just define
 321    this macro, it would only affect the builtin alloca and variable
 322    local data (non-ANSI, non-K&R, Gnu C extension).  */
 323 #define STACK_BOUNDARY \
 324  (TARGET_STACK_ALIGN ? (TARGET_ALIGN_BY_32 ? 32 : 16) : 8)
 325
 326 #define FUNCTION_BOUNDARY 16
 327
 328 /* Do not change BIGGEST_ALIGNMENT (when optimizing), as it will affect
 329    strange places, at least in 2.1.  */
 330 #define BIGGEST_ALIGNMENT 8
 331
 332 /* If -m16bit,  -m16-bit, -malign or -mdata-align,
 333    align everything to 16 bit.  */
 334 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN)                       \
 335  (TARGET_DATA_ALIGN                                             \
 336   ? (TARGET_ALIGN_BY_32                                         \
 337      ? (BASIC_ALIGN < 32 ? 32 : BASIC_ALIGN)                    \
 338      : (BASIC_ALIGN < 16 ? 16 : BASIC_ALIGN)) : BASIC_ALIGN)
 339
 340 /* FIXME: Define LOCAL_ALIGNMENT for word and dword or arrays and
 341    structures (if -mstack-align=), and check that it is good.  */
 342
 343 #define EMPTY_FIELD_BOUNDARY 8
 344
 345 #define STRUCTURE_SIZE_BOUNDARY 8
 346
 347 #define STRICT_ALIGNMENT 0
 348
 349 /* Remove any previous definition (elfos.h).
 350    ??? If it wasn't for all the other stuff that affects layout of
 351    structures and bit-fields, this could presumably cause incompatibility
 352    with other GNU/Linux ports (i.e. elfos.h users).  */
 353 #undef PCC_BITFIELD_TYPE_MATTERS
 354
 355
 356 /* Node: Type Layout */
 357
 358 /* Note that DOUBLE_TYPE_SIZE is not defined anymore, since the default
 359    value gives a 64-bit double, which is what we now use.  */
 360
 361 /* For compatibility and historical reasons, a char should be signed.  */
 362 #define DEFAULT_SIGNED_CHAR 1
 363
 364 /* Note that WCHAR_TYPE_SIZE is used in cexp.y,
 365    where TARGET_SHORT is not available.  */
 366 #undef WCHAR_TYPE
 367 #define WCHAR_TYPE "long int"
 368
 369 #undef WCHAR_TYPE_SIZE
 370 #define WCHAR_TYPE_SIZE 32
 371
 372
 373 /* Node: Register Basics */
 374
 375 /*  We count all 16 non-special registers, SRP, a faked argument
 376     pointer register, MOF, CCR/DCCR, and the faked frame-pointer.  */
 377 #define FIRST_PSEUDO_REGISTER (16 + 1 + 1 + 1 + 1 + 1)
 378
 379 /* For CRIS, these are r15 (pc) and r14 (sp). Register r8 is used as a
 380    frame-pointer, but is not fixed.  SRP is not included in general
 381    registers and will not be used automatically.  All other special
 382    registers are fixed at the moment.  The faked argument pointer register
 383    is fixed too.  */
 384 #define FIXED_REGISTERS \
 385  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1}
 386
 387 /* Register r9 is used for structure-address, r10-r13 for parameters,
 388    r10- for return values.  */
 389 #define CALL_USED_REGISTERS \
 390  {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1}
 391
 392 /* Node: Allocation Order */
 393
 394 /* We need this on CRIS, because call-used regs should be used first,
 395    (so we don't need to push).  Else start using registers from r0 and up.
 396     This preference is mainly because if we put call-used-regs from r0
 397    and up, then we can't use movem to push the rest, (which have to be
 398    saved if we use them, and movem has to start with r0).
 399    Change here if you change which registers to use as call registers.
 400
 401    The actual need to explicitly prefer call-used registers improved the
 402    situation a lot for 2.1, but might not actually be needed anymore.
 403    Still, this order reflects what GCC should find out by itself, so it
 404    probably does not hurt.
 405
 406    Order of preference: Call-used-regs first, then r0 and up, last fp &
 407    sp & pc as fillers.
 408    Call-used regs in opposite order, so they will cause less conflict if
 409    a function has few args (<= 3) and it wants a scratch reg.
 410     Use struct-return address first, since very few functions use
 411    structure return values so it is likely to be available.  */
 412 #define REG_ALLOC_ORDER \
 413  {9, 13, 12, 11, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 14, 15, 17, 16, 18, 19, \
 414   20}
 415
 416
 417 /* Node: Leaf Functions */
 418 /* (no definitions) */
 419
 420 /* Node: Stack Registers */
 421 /* (no definitions) */
 422
 423
 424 /* Node: Register Classes */
 425
 426 /* We need a separate register class to handle register allocation for
 427    ACR, since it can't be used for post-increment.
 428
 429    It's not obvious, but having subunions of all movable-between
 430    register classes does really help register allocation (pre-IRA
 431    comment).  */
 432 enum reg_class
 433   {
 434     NO_REGS,
 435     ACR_REGS, MOF_REGS, SRP_REGS, CC0_REGS,
 436     MOF_SRP_REGS, SPECIAL_REGS,
 437     SPEC_ACR_REGS, GENNONACR_REGS,
 438     SPEC_GENNONACR_REGS, GENERAL_REGS,
 439     ALL_REGS,
 440     LIM_REG_CLASSES
 441   };
 442
 443 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 444
 445 #define REG_CLASS_NAMES                                         \
 446   {"NO_REGS",                                                   \
 447    "ACR_REGS", "MOF_REGS", "SRP_REGS", "CC0_REGS",              \
 448    "MOF_SRP_REGS", "SPECIAL_REGS",                              \
 449    "SPEC_ACR_REGS", "GENNONACR_REGS", "SPEC_GENNONACR_REGS",    \
 450    "GENERAL_REGS", "ALL_REGS"}
 451
 452 #define CRIS_SPECIAL_REGS_CONTENTS                                      \
 453  ((1 << CRIS_SRP_REGNUM) | (1 << CRIS_MOF_REGNUM) | (1 << CRIS_CC0_REGNUM))
 454
 455 #define CRIS_FAKED_REGS_CONTENTS \
 456  ((1 << CRIS_AP_REGNUM) | (1 << CRIS_FP_REGNUM))
 457
 458 /* Count in the faked argument register in GENERAL_REGS.  Keep out SRP.  */
 459 #define REG_CLASS_CONTENTS                      \
 460   {                                             \
 461    {0},                                         \
 462    {1 << CRIS_ACR_REGNUM},                      \
 463    {1 << CRIS_MOF_REGNUM},                      \
 464    {1 << CRIS_SRP_REGNUM},                      \
 465    {1 << CRIS_CC0_REGNUM},                      \
 466    {(1 << CRIS_MOF_REGNUM)                      \
 467     | (1 << CRIS_SRP_REGNUM)},                  \
 468    {CRIS_SPECIAL_REGS_CONTENTS},                \
 469    {CRIS_SPECIAL_REGS_CONTENTS                  \
 470     | (1 << CRIS_ACR_REGNUM)},                  \
 471    {(0xffff | CRIS_FAKED_REGS_CONTENTS)         \
 472     & ~(1 << CRIS_ACR_REGNUM)},                 \
 473    {(0xffff | CRIS_FAKED_REGS_CONTENTS          \
 474     | CRIS_SPECIAL_REGS_CONTENTS)               \
 475     & ~(1 << CRIS_ACR_REGNUM)},                 \
 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_ACR_REGNUM ? ACR_REGS :      \
 483    (REGNO) == CRIS_MOF_REGNUM ? MOF_REGS :      \
 484    (REGNO) == CRIS_SRP_REGNUM ? SRP_REGS :      \
 485    (REGNO) == CRIS_CC0_REGNUM ? CC0_REGS :      \
 486    GENERAL_REGS)
 487
 488 #define BASE_REG_CLASS GENERAL_REGS
 489
 490 #define MODE_CODE_BASE_REG_CLASS(MODE, AS, OCODE, ICODE)        \
 491   ((OCODE) != POST_INC ? BASE_REG_CLASS : GENNONACR_REGS)
 492
 493 #define INDEX_REG_CLASS GENERAL_REGS
 494
 495 /* Since it uses reg_renumber, it is safe only once reg_renumber
 496    has been allocated, which happens in reginfo.c during register
 497    allocation.  */
 498 #define REGNO_OK_FOR_BASE_P(REGNO)                                      \
 499  ((REGNO) <= CRIS_LAST_GENERAL_REGISTER                                 \
 500   || (REGNO) == FRAME_POINTER_REGNUM                                    \
 501   || (REGNO) == ARG_POINTER_REGNUM                                      \
 502   || (unsigned) reg_renumber[REGNO] <= CRIS_LAST_GENERAL_REGISTER       \
 503   || (unsigned) reg_renumber[REGNO] == FRAME_POINTER_REGNUM             \
 504   || (unsigned) reg_renumber[REGNO] == ARG_POINTER_REGNUM)
 505
 506 /* See REGNO_OK_FOR_BASE_P.  */
 507 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P(REGNO)
 508
 509 /* We can't move special registers to and from memory in smaller than
 510    word_mode.  We also can't move between special registers.  Luckily,
 511    -1, as returned by true_regnum for non-sub/registers, is valid as a
 512    parameter to our REGNO_REG_CLASS, returning GENERAL_REGS, so we get
 513    the effect that any X that isn't a special-register is treated as
 514    a non-empty intersection with GENERAL_REGS.  */
 515 #define SECONDARY_RELOAD_CLASS(CLASS, MODE, X)                          \
 516  ((reg_class_subset_p (CLASS, SPECIAL_REGS)                             \
 517    && ((GET_MODE_SIZE (MODE) < 4 && MEM_P (X))                          \
 518        || !reg_classes_intersect_p (REGNO_REG_CLASS (true_regnum (X)),  \
 519                                     GENERAL_REGS)))                     \
 520    ? GENERAL_REGS : NO_REGS)
 521
 522 /* For CRIS, this is always the size of MODE in words,
 523    since all registers are the same size.  To use omitted modes in
 524    patterns with reload constraints, you must say the widest size
 525    which is allowed for VOIDmode.
 526    FIXME:  Does that still apply for gcc-2.9x?  Keep poisoned until such
 527    patterns are added back.  News: 2001-03-16: Happens as early as the
 528    underscore-test.  */
 529 #define CLASS_MAX_NREGS(CLASS, MODE)                                    \
 530  ((MODE) == VOIDmode                                                    \
 531   ? 1 /* + cris_fatal ("CLASS_MAX_NREGS with VOIDmode") */              \
 532   : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
 533
 534
 535 /* Node: Frame Layout */
 536
 537 #define STACK_GROWS_DOWNWARD 1
 538 #define FRAME_GROWS_DOWNWARD 1
 539
 540 #define FIRST_PARM_OFFSET(FNDECL) 0
 541
 542 #define RETURN_ADDR_RTX(COUNT, FRAMEADDR) \
 543  cris_return_addr_rtx (COUNT, FRAMEADDR)
 544
 545 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, CRIS_SRP_REGNUM)
 546
 547 /* FIXME: Any __builtin_eh_return callers must not return anything and
 548    there must not be collisions with incoming parameters.  Luckily the
 549    number of __builtin_eh_return callers is limited.  For now return
 550    parameter registers in reverse order and hope for the best.  */
 551 #define EH_RETURN_DATA_REGNO(N) \
 552   (IN_RANGE ((N), 0, 3) ? (CRIS_FIRST_ARG_REG + 3 - (N)) : INVALID_REGNUM)
 553
 554 /* Store the stack adjustment in the structure-return-address register.  */
 555 #define CRIS_STACKADJ_REG CRIS_STRUCT_VALUE_REGNUM
 556 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (SImode, CRIS_STACKADJ_REG)
 557
 558 #define EH_RETURN_HANDLER_RTX \
 559   cris_return_addr_rtx (0, NULL)
 560
 561 #define INIT_EXPANDERS cris_init_expanders ()
 562
 563 /* FIXME: Move this to right node (it's not documented properly yet).  */
 564 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (CRIS_SRP_REGNUM)
 565
 566 /* FIXME: Move this to right node (it's not documented properly yet).
 567    FIXME: Check what alignment we can assume regarding
 568    TARGET_STACK_ALIGN and TARGET_ALIGN_BY_32.  */
 569 #define DWARF_CIE_DATA_ALIGNMENT -1
 570
 571 /* If we would ever need an exact mapping between canonical register
 572    number and dwarf frame register, we would either need to include all
 573    registers in the gcc description (with some marked fixed of course), or
 574    an inverse mapping from dwarf register to gcc register.  There is one
 575    need in dwarf2out.c:expand_builtin_init_dwarf_reg_sizes.  Right now, I
 576    don't see that we need exact correspondence between DWARF *frame*
 577    registers and DBX_REGISTER_NUMBER, so map them onto GCC registers.  */
 578 #define DWARF_FRAME_REGNUM(REG) (REG)
 579
 580 /* Node: Stack Checking */
 581 /* (no definitions) FIXME: Check.  */
 582
 583 /* Node: Frame Registers */
 584
 585 #define STACK_POINTER_REGNUM CRIS_SP_REGNUM
 586
 587 /* Register used for frame pointer.  This is also the last of the saved
 588    registers, when a frame pointer is not used.  */
 589 #define HARD_FRAME_POINTER_REGNUM CRIS_REAL_FP_REGNUM
 590
 591 /* Faked register, is always eliminated to at least CRIS_REAL_FP_REGNUM.  */
 592 #define FRAME_POINTER_REGNUM CRIS_FP_REGNUM
 593
 594 /* Faked register, is always eliminated.  We need it to eliminate
 595    allocating stack slots for the return address and the frame pointer.  */
 596 #define ARG_POINTER_REGNUM CRIS_AP_REGNUM
 597
 598 #define STATIC_CHAIN_REGNUM CRIS_STATIC_CHAIN_REGNUM
 599
 600 /* No unwind context is needed for faked registers nor DCCR.  Currently not MOF
 601    too, but let's keep that open.  */
 602 #define DWARF_FRAME_REGISTERS (CRIS_MOF_REGNUM + 1)
 603
 604 /* Node: Elimination */
 605
 606 #define ELIMINABLE_REGS                         \
 607  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 608   {ARG_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM},      \
 609   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
 610   {FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}}
 611
 612 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 613  (OFFSET) = cris_initial_elimination_offset (FROM, TO)
 614
 615
 616 /* Node: Stack Arguments */
 617
 618 /* Since many parameters take up one register each in any case,
 619    defining TARGET_PROMOTE_PROTOTYPES that always returns true would
 620    seem like a good idea, but measurements indicate that a combination
 621    using PROMOTE_MODE is better.  */
 622
 623 #define ACCUMULATE_OUTGOING_ARGS 1
 624
 625
 626 /* Node: Register Arguments */
 627
 628 /* Contrary to what you'd believe, defining FUNCTION_ARG_CALLEE_COPIES
 629    seems like a (small total) loss, at least for gcc-2.7.2 compiling and
 630    running gcc-2.1 (small win in size, small loss running -- 100.1%),
 631    and similarly for size for products (.1 .. .3% bloat, sometimes win).
 632    Due to the empirical likeliness of making slower code, it is not
 633    defined.  */
 634
 635 /* This no longer *needs* to be a structure; but keeping it as such should
 636    not hurt (and hacking the ABI is simpler).  */
 637 #define CUMULATIVE_ARGS struct cum_args
 638 struct cum_args {int regs;};
 639
 640 /* The regs member is an integer, the number of arguments got into
 641    registers so far.  */
 642 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 643  ((CUM).regs = 0)
 644
 645 #define FUNCTION_ARG_REGNO_P(REGNO)                     \
 646  ((REGNO) >= CRIS_FIRST_ARG_REG                         \
 647   && (REGNO) < CRIS_FIRST_ARG_REG + (CRIS_MAX_ARGS_IN_REGS))
 648
 649
 650 /* Node: Aggregate Return */
 651
 652 #define CRIS_STRUCT_VALUE_REGNUM ((CRIS_FIRST_ARG_REG) - 1)
 653
 654
 655 /* Node: Caller Saves */
 656 /* (no definitions) */
 657
 658 /* Node: Function entry */
 659
 660 /* See cris.c for TARGET_ASM_FUNCTION_PROLOGUE and
 661    TARGET_ASM_FUNCTION_EPILOGUE.  */
 662
 663 /* Node: Profiling */
 664
 665 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 666  error ("no FUNCTION_PROFILER for CRIS")
 667
 668 /* FIXME: Some of the undefined macros might be mandatory.  If so, fix
 669    documentation.  */
 670
 671
 672 /* Node: Trampolines */
 673
 674 #define TRAMPOLINE_SIZE 32
 675
 676 /* CRIS wants instructions on word-boundary.  */
 677 #define TRAMPOLINE_ALIGNMENT 16
 678
 679 /* Node: Library Calls */
 680
 681 /* If you change this, you have to check whatever libraries and systems
 682    that use it.  */
 683 #define TARGET_EDOM 33
 684
 685
 686 /* Node: Addressing Modes */
 687
 688 #define HAVE_POST_INCREMENT 1
 689
 690 #define CONSTANT_ADDRESS_P(X) \
 691   (CONSTANT_P (X) && cris_legitimate_address_p (QImode, X, false))
 692
 693 #define MAX_REGS_PER_ADDRESS 2
 694
 695 /* Fix reloads known to cause suboptimal spilling.  */
 696 #define LEGITIMIZE_RELOAD_ADDRESS(X, MODE, OPNUM, TYPE, INDL, WIN)      \
 697   do                                                                    \
 698     {                                                                   \
 699       if (cris_reload_address_legitimized (X, MODE, OPNUM, TYPE, INDL)) \
 700         goto WIN;                                                       \
 701     }                                                                   \
 702   while (0)
 703
 704
 705 /* Node: Condition Code */
 706
 707 /* FIXME: Maybe define TARGET_CANONICALIZE_COMPARISON later, when
 708    playing with optimizations.  */
 709
 710 #define SELECT_CC_MODE(op, x, y) cris_select_cc_mode(op, x, y)
 711
 712 #define REVERSIBLE_CC_MODE(MODE) true
 713
 714 /* No known need to define REVERSE_CONDITION, the default is good.  */
 715
 716 /* Node: Costs */
 717
 718 /* Regardless of the presence of delay slots, the default value of 1 for
 719    BRANCH_COST is the best in the range (1, 2, 3), tested with gcc-2.7.2
 720    with testcases ipps and gcc, giving smallest and fastest code.  */
 721
 722 #define SLOW_BYTE_ACCESS 0
 723
 724 /* This is the threshold *below* which inline move sequences of
 725    word-length sizes will be emitted.  The "9" will translate to
 726    (9 - 1) * 4 = 32 bytes maximum moved, but using 16 instructions
 727    (8 instruction sequences) or less.  */
 728 #define MOVE_RATIO(speed) 9
 729
 730
 731 /* Node: Sections */
 732
 733 #define TEXT_SECTION_ASM_OP "\t.text"
 734
 735 #define DATA_SECTION_ASM_OP "\t.data"
 736
 737 /* The jump table is immediately connected to the preceding insn.  */
 738 #define JUMP_TABLES_IN_TEXT_SECTION 1
 739
 740
 741 /* Node: File Framework */
 742
 743 /* We don't want an .ident for gcc.  To avoid that but still support
 744    #ident, we override TARGET_ASM_OUTPUT_IDENT and, since the gcc .ident
 745    is its only use besides front-end .ident directives, we return if
 746    the state if the cgraph is not PARSING.  */
 747 #undef TARGET_ASM_OUTPUT_IDENT
 748 #define TARGET_ASM_OUTPUT_IDENT cris_asm_output_ident
 749
 750 #define ASM_APP_ON "#APP\n"
 751
 752 #define ASM_APP_OFF "#NO_APP\n"
 753
 754
 755 /* Node: Data Output */
 756
 757 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) (C) == '@'
 758
 759 /* Node: Uninitialized Data */
 760
 761 /* Remember to round off odd values if we want data alignment,
 762    since we cannot do that with an .align directive.
 763
 764    Using .comm causes the space not to be reserved in .bss, but by
 765    tricks with the symbol type.  Not good if other tools than binutils
 766    are used on the object files.  Since ".global ... .lcomm ..." works, we
 767    use that.  Use .._ALIGNED_COMMON, since gcc whines when we only have
 768    ..._COMMON, and we prefer to whine ourselves; BIGGEST_ALIGNMENT is not
 769    the one to check.  */
 770 /* FIXME: I suspect a bug in gcc with alignment.  Do not warn until
 771    investigated; it mucks up the testsuite results.  */
 772 #define CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, LOCAL) \
 773   do                                                                    \
 774     {                                                                   \
 775       int align_ = (ALIGN) / BITS_PER_UNIT;                             \
 776       if (TARGET_DATA_ALIGN && TARGET_ALIGN_BY_32 && align_ < 4)        \
 777         align_ = 4;                                                     \
 778       else if (TARGET_DATA_ALIGN && align_ < 2)                         \
 779         align_ = 2;                                                     \
 780       /* FIXME: Do we need this?  */                                    \
 781       else if (align_ < 1)                                              \
 782         align_ = 1;                                                     \
 783                                                                         \
 784       if (LOCAL)                                                        \
 785         {                                                               \
 786           fprintf ((FILE), "%s", LOCAL_ASM_OP);                         \
 787           assemble_name ((FILE), (NAME));                               \
 788           fprintf ((FILE), "\n");                                       \
 789         }                                                               \
 790       fprintf ((FILE), "%s", COMMON_ASM_OP);                            \
 791       assemble_name ((FILE), (NAME));                                   \
 792       fprintf ((FILE), ",%u,%u\n", (int)(SIZE), align_);                \
 793     }                                                                   \
 794   while (0)
 795
 796 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
 797  CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 0)
 798
 799 #undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
 800 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
 801  CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 1)
 802
 803 /* Node: Label Output */
 804
 805 /* Globalizing directive for a label.  */
 806 #define GLOBAL_ASM_OP "\t.global "
 807
 808 #define SUPPORTS_WEAK 1
 809
 810 #define ASM_OUTPUT_SYMBOL_REF(STREAM, SYM) \
 811  cris_asm_output_symbol_ref (STREAM, SYM)
 812
 813 #define ASM_OUTPUT_LABEL_REF(STREAM, BUF) \
 814  cris_asm_output_label_ref (STREAM, BUF)
 815
 816 /* Remove any previous definition (elfos.h).  */
 817 #undef ASM_GENERATE_INTERNAL_LABEL
 818 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 819   sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long) NUM)
 820
 821 /* Node: Initialization */
 822 /* (no definitions) */
 823
 824 /* Node: Macros for Initialization */
 825 /* (no definitions) */
 826
 827 /* Node: Instruction Output */
 828
 829 #define REGISTER_NAMES                                  \
 830  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", \
 831   "r9", "r10", "r11", "r12", "r13", "sp", "pc", "srp",  \
 832   "mof", "faked_ap", "dccr", "faked_fp"}
 833
 834 #define ADDITIONAL_REGISTER_NAMES \
 835  {{"r14", 14}, {"r15", 15}}
 836
 837 /* Output an empty line to illustrate the presence of the delay slot.  */
 838 #define DBR_OUTPUT_SEQEND(FILE) \
 839   fprintf (FILE, "\n")
 840
 841 #define LOCAL_LABEL_PREFIX "."
 842
 843 /* cppinit.c initializes a const array from this, so it must be constant,
 844    can't have it different based on options.  Luckily, the prefix is
 845    always allowed, so let's have it on all GCC-generated code.  Note that
 846    we have this verbatim everywhere in the back-end, not using %R or %s or
 847    such.  */
 848 #define REGISTER_PREFIX "$"
 849
 850 /* Remove any previous definition (elfos.h).  */
 851 /* We use -fno-leading-underscore to remove it, when necessary.  */
 852 #undef USER_LABEL_PREFIX
 853 #define USER_LABEL_PREFIX "_"
 854
 855 #define ASM_OUTPUT_REG_PUSH(FILE, REGNO)                                \
 856   fprintf (FILE, "\tpush $%s\n", reg_names[REGNO])
 857
 858 #define ASM_OUTPUT_REG_POP(FILE, REGNO) \
 859   fprintf (FILE, "\tmove [$sp+],$%s\n", reg_names[REGNO])
 860
 861
 862 /* Node: Dispatch Tables */
 863
 864 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL)                \
 865   asm_fprintf (FILE, "\t.word %LL%d-%LL%d\n", VALUE, REL)
 866
 867 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
 868   asm_fprintf (FILE, "\t.dword %LL%d\n", VALUE)
 869
 870 /* Defined to also emit an .align in elfos.h.  We don't want that.  */
 871 #undef ASM_OUTPUT_CASE_LABEL
 872
 873 /* Since the "bound" insn loads the comparison value if the compared<
 874    value (register) is out of bounds (0..comparison value-1), we need
 875    to output another case to catch it.
 876    The way to find it is to look for the label_ref at the else-arm inside
 877    the expanded casesi core-insn.
 878    FIXME: Check this construct when changing to new version of gcc.  */
 879 #define ASM_OUTPUT_CASE_END(STREAM, NUM, TABLE)                         \
 880   cris_asm_output_case_end (STREAM, NUM, TABLE)
 881
 882
 883 /* Node: Exception Region Output */
 884 /* (no definitions) */
 885 /* FIXME: Fill in with our own optimized layout.  */
 886
 887 /* Node: Alignment Output */
 888
 889 #define ASM_OUTPUT_ALIGN(FILE, LOG)  \
 890  fprintf (FILE, "\t.align %d\n", (LOG))
 891
 892
 893 /* Node: All Debuggers */
 894
 895 #define DBX_REGISTER_NUMBER(REGNO)                              \
 896  ((REGNO) == CRIS_SRP_REGNUM ? CRIS_CANONICAL_SRP_REGNUM :      \
 897   (REGNO) == CRIS_MOF_REGNUM ? CRIS_CANONICAL_MOF_REGNUM :      \
 898   (REGNO) == CRIS_CC0_REGNUM ? CRIS_CANONICAL_CC0_REGNUM :      \
 899  (REGNO))
 900
 901 /* FIXME: Investigate DEBUGGER_AUTO_OFFSET, DEBUGGER_ARG_OFFSET.  */
 902
 903
 904 /* Node: DWARF */
 905 /* (no definitions) */
 906
 907 /* Node: Misc */
 908
 909 /* A combination of the bound (umin) insn together with a
 910    sign-extended add via the table to PC seems optimal.
 911    If the table overflows, the assembler will take care of it.
 912    Theoretically, in extreme cases (uncertain if they occur), an error
 913    will be emitted, so FIXME: Check how large case-tables are emitted,
 914    possible add an option to emit SImode case-tables.  */
 915 #define CASE_VECTOR_MODE HImode
 916
 917 #define CASE_VECTOR_PC_RELATIVE 1
 918
 919 /* FIXME: Investigate CASE_VECTOR_SHORTEN_MODE to make sure HImode is not
 920    used when broken-.word could possibly fail (plus testcase).  */
 921
 922 /* This is the number of bytes that can be moved in one
 923    reasonably fast instruction sequence.  For CRIS, this is two
 924    instructions: mem => reg, reg => mem.  */
 925 #define MOVE_MAX 4
 926
 927 /* Maybe SHIFT_COUNT_TRUNCATED is safe to define?  FIXME: Check later.  */
 928
 929 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
 930 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
 931
 932 #define Pmode SImode
 933
 934 #define FUNCTION_MODE QImode
 935
 936 /*
 937  * Local variables:
 938  * eval: (c-set-style "gnu")
 939  * indent-tabs-mode: t
 940  * End:
 941  */