gcc/config/cris/cris.h

   1 /* Definitions for GCC.  Part of the machine description for CRIS.
   2    Copyright (C) 1998-2021 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 /* This is only used for non-scalars.  Strange stuff happens to structs
 356    (FIXME: What?) if we use anything larger than largest actually used
 357    datum size, so lets make it 32.  The type "long long" will still work
 358    as usual.  We can still have DImode insns, but they will only be used
 359    for scalar data (i.e. long long).  */
 360 #define MAX_FIXED_MODE_SIZE 32
 361
 362
 363 /* Node: Type Layout */
 364
 365 /* Note that DOUBLE_TYPE_SIZE is not defined anymore, since the default
 366    value gives a 64-bit double, which is what we now use.  */
 367
 368 /* For compatibility and historical reasons, a char should be signed.  */
 369 #define DEFAULT_SIGNED_CHAR 1
 370
 371 /* Note that WCHAR_TYPE_SIZE is used in cexp.y,
 372    where TARGET_SHORT is not available.  */
 373 #undef WCHAR_TYPE
 374 #define WCHAR_TYPE "long int"
 375
 376 #undef WCHAR_TYPE_SIZE
 377 #define WCHAR_TYPE_SIZE 32
 378
 379
 380 /* Node: Register Basics */
 381
 382 /*  We count all 16 non-special registers, SRP, a faked argument
 383     pointer register, MOF and CCR/DCCR.  */
 384 #define FIRST_PSEUDO_REGISTER (16 + 1 + 1 + 1 + 1)
 385
 386 /* For CRIS, these are r15 (pc) and r14 (sp). Register r8 is used as a
 387    frame-pointer, but is not fixed.  SRP is not included in general
 388    registers and will not be used automatically.  All other special
 389    registers are fixed at the moment.  The faked argument pointer register
 390    is fixed too.  */
 391 #define FIXED_REGISTERS \
 392  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1}
 393
 394 /* Register r9 is used for structure-address, r10-r13 for parameters,
 395    r10- for return values.  */
 396 #define CALL_USED_REGISTERS \
 397  {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1}
 398
 399 /* Node: Allocation Order */
 400
 401 /* We need this on CRIS, because call-used regs should be used first,
 402    (so we don't need to push).  Else start using registers from r0 and up.
 403     This preference is mainly because if we put call-used-regs from r0
 404    and up, then we can't use movem to push the rest, (which have to be
 405    saved if we use them, and movem has to start with r0).
 406    Change here if you change which registers to use as call registers.
 407
 408    The actual need to explicitly prefer call-used registers improved the
 409    situation a lot for 2.1, but might not actually be needed anymore.
 410    Still, this order reflects what GCC should find out by itself, so it
 411    probably does not hurt.
 412
 413    Order of preference: Call-used-regs first, then r0 and up, last fp &
 414    sp & pc as fillers.
 415    Call-used regs in opposite order, so they will cause less conflict if
 416    a function has few args (<= 3) and it wants a scratch reg.
 417     Use struct-return address first, since very few functions use
 418    structure return values so it is likely to be available.  */
 419 #define REG_ALLOC_ORDER \
 420  {9, 13, 12, 11, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 14, 15, 17, 16, 18, 19}
 421
 422
 423 /* Node: Leaf Functions */
 424 /* (no definitions) */
 425
 426 /* Node: Stack Registers */
 427 /* (no definitions) */
 428
 429
 430 /* Node: Register Classes */
 431
 432 /* We need a separate register class to handle register allocation for
 433    ACR, since it can't be used for post-increment.
 434
 435    It's not obvious, but having subunions of all movable-between
 436    register classes does really help register allocation (pre-IRA
 437    comment).  */
 438 enum reg_class
 439   {
 440     NO_REGS,
 441     ACR_REGS, MOF_REGS, SRP_REGS, CC0_REGS,
 442     MOF_SRP_REGS, SPECIAL_REGS,
 443     SPEC_ACR_REGS, GENNONACR_REGS,
 444     SPEC_GENNONACR_REGS, GENERAL_REGS,
 445     ALL_REGS,
 446     LIM_REG_CLASSES
 447   };
 448
 449 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 450
 451 #define REG_CLASS_NAMES                                         \
 452   {"NO_REGS",                                                   \
 453    "ACR_REGS", "MOF_REGS", "SRP_REGS", "CC0_REGS",              \
 454    "MOF_SRP_REGS", "SPECIAL_REGS",                              \
 455    "SPEC_ACR_REGS", "GENNONACR_REGS", "SPEC_GENNONACR_REGS",    \
 456    "GENERAL_REGS", "ALL_REGS"}
 457
 458 #define CRIS_SPECIAL_REGS_CONTENTS                                      \
 459  ((1 << CRIS_SRP_REGNUM) | (1 << CRIS_MOF_REGNUM) | (1 << CRIS_CC0_REGNUM))
 460
 461 /* Count in the faked argument register in GENERAL_REGS.  Keep out SRP.  */
 462 #define REG_CLASS_CONTENTS                      \
 463   {                                             \
 464    {0},                                         \
 465    {1 << CRIS_ACR_REGNUM},                      \
 466    {1 << CRIS_MOF_REGNUM},                      \
 467    {1 << CRIS_SRP_REGNUM},                      \
 468    {1 << CRIS_CC0_REGNUM},                      \
 469    {(1 << CRIS_MOF_REGNUM)                      \
 470     | (1 << CRIS_SRP_REGNUM)},                  \
 471    {CRIS_SPECIAL_REGS_CONTENTS},                \
 472    {CRIS_SPECIAL_REGS_CONTENTS                  \
 473     | (1 << CRIS_ACR_REGNUM)},                  \
 474    {(0xffff | (1 << CRIS_AP_REGNUM))            \
 475     & ~(1 << CRIS_ACR_REGNUM)},                 \
 476    {(0xffff | (1 << CRIS_AP_REGNUM)             \
 477     | CRIS_SPECIAL_REGS_CONTENTS)               \
 478     & ~(1 << CRIS_ACR_REGNUM)},                 \
 479    {0xffff | (1 << CRIS_AP_REGNUM)},            \
 480    {0xffff | (1 << CRIS_AP_REGNUM)              \
 481     | CRIS_SPECIAL_REGS_CONTENTS}               \
 482   }
 483
 484 #define REGNO_REG_CLASS(REGNO)                  \
 485   ((REGNO) == CRIS_ACR_REGNUM ? ACR_REGS :      \
 486    (REGNO) == CRIS_MOF_REGNUM ? MOF_REGS :      \
 487    (REGNO) == CRIS_SRP_REGNUM ? SRP_REGS :      \
 488    (REGNO) == CRIS_CC0_REGNUM ? CC0_REGS :      \
 489    GENERAL_REGS)
 490
 491 #define BASE_REG_CLASS GENERAL_REGS
 492
 493 #define MODE_CODE_BASE_REG_CLASS(MODE, AS, OCODE, ICODE)        \
 494   ((OCODE) != POST_INC ? BASE_REG_CLASS : GENNONACR_REGS)
 495
 496 #define INDEX_REG_CLASS GENERAL_REGS
 497
 498 /* Since it uses reg_renumber, it is safe only once reg_renumber
 499    has been allocated, which happens in reginfo.c during register
 500    allocation.  */
 501 #define REGNO_OK_FOR_BASE_P(REGNO)                                      \
 502  ((REGNO) <= CRIS_LAST_GENERAL_REGISTER                                 \
 503   || (REGNO) == ARG_POINTER_REGNUM                                      \
 504   || (unsigned) reg_renumber[REGNO] <= CRIS_LAST_GENERAL_REGISTER       \
 505   || (unsigned) reg_renumber[REGNO] == ARG_POINTER_REGNUM)
 506
 507 /* See REGNO_OK_FOR_BASE_P.  */
 508 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P(REGNO)
 509
 510 /* We can't move special registers to and from memory in smaller than
 511    word_mode.  We also can't move between special registers.  Luckily,
 512    -1, as returned by true_regnum for non-sub/registers, is valid as a
 513    parameter to our REGNO_REG_CLASS, returning GENERAL_REGS, so we get
 514    the effect that any X that isn't a special-register is treated as
 515    a non-empty intersection with GENERAL_REGS.  */
 516 #define SECONDARY_RELOAD_CLASS(CLASS, MODE, X)                          \
 517  ((reg_class_subset_p (CLASS, SPECIAL_REGS)                             \
 518    && ((GET_MODE_SIZE (MODE) < 4 && MEM_P (X))                          \
 519        || !reg_classes_intersect_p (REGNO_REG_CLASS (true_regnum (X)),  \
 520                                     GENERAL_REGS)))                     \
 521    ? GENERAL_REGS : NO_REGS)
 522
 523 /* For CRIS, this is always the size of MODE in words,
 524    since all registers are the same size.  To use omitted modes in
 525    patterns with reload constraints, you must say the widest size
 526    which is allowed for VOIDmode.
 527    FIXME:  Does that still apply for gcc-2.9x?  Keep poisoned until such
 528    patterns are added back.  News: 2001-03-16: Happens as early as the
 529    underscore-test.  */
 530 #define CLASS_MAX_NREGS(CLASS, MODE)                                    \
 531  ((MODE) == VOIDmode                                                    \
 532   ? 1 /* + cris_fatal ("CLASS_MAX_NREGS with VOIDmode") */              \
 533   : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
 534
 535
 536 /* Node: Frame Layout */
 537
 538 #define STACK_GROWS_DOWNWARD 1
 539 #define FRAME_GROWS_DOWNWARD 1
 540
 541 #define FIRST_PARM_OFFSET(FNDECL) 0
 542
 543 #define RETURN_ADDR_RTX(COUNT, FRAMEADDR) \
 544  cris_return_addr_rtx (COUNT, FRAMEADDR)
 545
 546 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, CRIS_SRP_REGNUM)
 547
 548 /* FIXME: Any __builtin_eh_return callers must not return anything and
 549    there must not be collisions with incoming parameters.  Luckily the
 550    number of __builtin_eh_return callers is limited.  For now return
 551    parameter registers in reverse order and hope for the best.  */
 552 #define EH_RETURN_DATA_REGNO(N) \
 553   (IN_RANGE ((N), 0, 3) ? (CRIS_FIRST_ARG_REG + 3 - (N)) : INVALID_REGNUM)
 554
 555 /* Store the stack adjustment in the structure-return-address register.  */
 556 #define CRIS_STACKADJ_REG CRIS_STRUCT_VALUE_REGNUM
 557 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (SImode, CRIS_STACKADJ_REG)
 558
 559 #define EH_RETURN_HANDLER_RTX \
 560   cris_return_addr_rtx (0, NULL)
 561
 562 #define INIT_EXPANDERS cris_init_expanders ()
 563
 564 /* FIXME: Move this to right node (it's not documented properly yet).  */
 565 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (CRIS_SRP_REGNUM)
 566
 567 /* FIXME: Move this to right node (it's not documented properly yet).
 568    FIXME: Check what alignment we can assume regarding
 569    TARGET_STACK_ALIGN and TARGET_ALIGN_BY_32.  */
 570 #define DWARF_CIE_DATA_ALIGNMENT -1
 571
 572 /* If we would ever need an exact mapping between canonical register
 573    number and dwarf frame register, we would either need to include all
 574    registers in the gcc description (with some marked fixed of course), or
 575    an inverse mapping from dwarf register to gcc register.  There is one
 576    need in dwarf2out.c:expand_builtin_init_dwarf_reg_sizes.  Right now, I
 577    don't see that we need exact correspondence between DWARF *frame*
 578    registers and DBX_REGISTER_NUMBER, so map them onto GCC registers.  */
 579 #define DWARF_FRAME_REGNUM(REG) (REG)
 580
 581 /* Node: Stack Checking */
 582 /* (no definitions) FIXME: Check.  */
 583
 584 /* Node: Frame Registers */
 585
 586 #define STACK_POINTER_REGNUM CRIS_SP_REGNUM
 587
 588 /* Register used for frame pointer.  This is also the last of the saved
 589    registers, when a frame pointer is not used.  */
 590 #define FRAME_POINTER_REGNUM CRIS_FP_REGNUM
 591
 592 /* Faked register, is always eliminated.  We need it to eliminate
 593    allocating stack slots for the return address and the frame pointer.  */
 594 #define ARG_POINTER_REGNUM CRIS_AP_REGNUM
 595
 596 #define STATIC_CHAIN_REGNUM CRIS_STATIC_CHAIN_REGNUM
 597
 598
 599 /* Node: Elimination */
 600
 601 #define ELIMINABLE_REGS                         \
 602  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 603   {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
 604   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
 605
 606 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 607  (OFFSET) = cris_initial_elimination_offset (FROM, TO)
 608
 609
 610 /* Node: Stack Arguments */
 611
 612 /* Since many parameters take up one register each in any case,
 613    defining TARGET_PROMOTE_PROTOTYPES that always returns true would
 614    seem like a good idea, but measurements indicate that a combination
 615    using PROMOTE_MODE is better.  */
 616
 617 #define ACCUMULATE_OUTGOING_ARGS 1
 618
 619
 620 /* Node: Register Arguments */
 621
 622 /* Contrary to what you'd believe, defining FUNCTION_ARG_CALLEE_COPIES
 623    seems like a (small total) loss, at least for gcc-2.7.2 compiling and
 624    running gcc-2.1 (small win in size, small loss running -- 100.1%),
 625    and similarly for size for products (.1 .. .3% bloat, sometimes win).
 626    Due to the empirical likeliness of making slower code, it is not
 627    defined.  */
 628
 629 /* This no longer *needs* to be a structure; but keeping it as such should
 630    not hurt (and hacking the ABI is simpler).  */
 631 #define CUMULATIVE_ARGS struct cum_args
 632 struct cum_args {int regs;};
 633
 634 /* The regs member is an integer, the number of arguments got into
 635    registers so far.  */
 636 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 637  ((CUM).regs = 0)
 638
 639 #define FUNCTION_ARG_REGNO_P(REGNO)                     \
 640  ((REGNO) >= CRIS_FIRST_ARG_REG                         \
 641   && (REGNO) < CRIS_FIRST_ARG_REG + (CRIS_MAX_ARGS_IN_REGS))
 642
 643
 644 /* Node: Aggregate Return */
 645
 646 #define CRIS_STRUCT_VALUE_REGNUM ((CRIS_FIRST_ARG_REG) - 1)
 647
 648
 649 /* Node: Caller Saves */
 650 /* (no definitions) */
 651
 652 /* Node: Function entry */
 653
 654 /* See cris.c for TARGET_ASM_FUNCTION_PROLOGUE and
 655    TARGET_ASM_FUNCTION_EPILOGUE.  */
 656
 657 /* Node: Profiling */
 658
 659 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 660  error ("no FUNCTION_PROFILER for CRIS")
 661
 662 /* FIXME: Some of the undefined macros might be mandatory.  If so, fix
 663    documentation.  */
 664
 665
 666 /* Node: Trampolines */
 667
 668 #define TRAMPOLINE_SIZE 32
 669
 670 /* CRIS wants instructions on word-boundary.  */
 671 #define TRAMPOLINE_ALIGNMENT 16
 672
 673 /* Node: Library Calls */
 674
 675 /* If you change this, you have to check whatever libraries and systems
 676    that use it.  */
 677 #define TARGET_EDOM 33
 678
 679
 680 /* Node: Addressing Modes */
 681
 682 #define HAVE_POST_INCREMENT 1
 683
 684 #define CONSTANT_ADDRESS_P(X) \
 685   (CONSTANT_P (X) && cris_legitimate_address_p (QImode, X, false))
 686
 687 #define MAX_REGS_PER_ADDRESS 2
 688
 689 /* Fix reloads known to cause suboptimal spilling.  */
 690 #define LEGITIMIZE_RELOAD_ADDRESS(X, MODE, OPNUM, TYPE, INDL, WIN)      \
 691   do                                                                    \
 692     {                                                                   \
 693       if (cris_reload_address_legitimized (X, MODE, OPNUM, TYPE, INDL)) \
 694         goto WIN;                                                       \
 695     }                                                                   \
 696   while (0)
 697
 698
 699 /* Node: Condition Code */
 700
 701 /* FIXME: Maybe define TARGET_CANONICALIZE_COMPARISON later, when
 702    playing with optimizations.  */
 703
 704 #define SELECT_CC_MODE(op, x, y) cris_select_cc_mode(op, x, y)
 705
 706 #define REVERSIBLE_CC_MODE(MODE) true
 707
 708 /* No known need to define REVERSE_CONDITION, the default is good.  */
 709
 710 /* Node: Costs */
 711
 712 /* Regardless of the presence of delay slots, the default value of 1 for
 713    BRANCH_COST is the best in the range (1, 2, 3), tested with gcc-2.7.2
 714    with testcases ipps and gcc, giving smallest and fastest code.  */
 715
 716 #define SLOW_BYTE_ACCESS 0
 717
 718 /* This is the threshold *below* which inline move sequences of
 719    word-length sizes will be emitted.  The "9" will translate to
 720    (9 - 1) * 4 = 32 bytes maximum moved, but using 16 instructions
 721    (8 instruction sequences) or less.  */
 722 #define MOVE_RATIO(speed) 9
 723
 724
 725 /* Node: Sections */
 726
 727 #define TEXT_SECTION_ASM_OP "\t.text"
 728
 729 #define DATA_SECTION_ASM_OP "\t.data"
 730
 731 /* The jump table is immediately connected to the preceding insn.  */
 732 #define JUMP_TABLES_IN_TEXT_SECTION 1
 733
 734
 735 /* Node: File Framework */
 736
 737 /* We don't want an .ident for gcc.  To avoid that but still support
 738    #ident, we override TARGET_ASM_OUTPUT_IDENT and, since the gcc .ident
 739    is its only use besides front-end .ident directives, we return if
 740    the state if the cgraph is not PARSING.  */
 741 #undef TARGET_ASM_OUTPUT_IDENT
 742 #define TARGET_ASM_OUTPUT_IDENT cris_asm_output_ident
 743
 744 #define ASM_APP_ON "#APP\n"
 745
 746 #define ASM_APP_OFF "#NO_APP\n"
 747
 748
 749 /* Node: Data Output */
 750
 751 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) (C) == '@'
 752
 753 /* Node: Uninitialized Data */
 754
 755 /* Remember to round off odd values if we want data alignment,
 756    since we cannot do that with an .align directive.
 757
 758    Using .comm causes the space not to be reserved in .bss, but by
 759    tricks with the symbol type.  Not good if other tools than binutils
 760    are used on the object files.  Since ".global ... .lcomm ..." works, we
 761    use that.  Use .._ALIGNED_COMMON, since gcc whines when we only have
 762    ..._COMMON, and we prefer to whine ourselves; BIGGEST_ALIGNMENT is not
 763    the one to check.  */
 764 /* FIXME: I suspect a bug in gcc with alignment.  Do not warn until
 765    investigated; it mucks up the testsuite results.  */
 766 #define CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, LOCAL) \
 767   do                                                                    \
 768     {                                                                   \
 769       int align_ = (ALIGN) / BITS_PER_UNIT;                             \
 770       if (TARGET_DATA_ALIGN && TARGET_ALIGN_BY_32 && align_ < 4)        \
 771         align_ = 4;                                                     \
 772       else if (TARGET_DATA_ALIGN && align_ < 2)                         \
 773         align_ = 2;                                                     \
 774       /* FIXME: Do we need this?  */                                    \
 775       else if (align_ < 1)                                              \
 776         align_ = 1;                                                     \
 777                                                                         \
 778       if (LOCAL)                                                        \
 779         {                                                               \
 780           fprintf ((FILE), "%s", LOCAL_ASM_OP);                         \
 781           assemble_name ((FILE), (NAME));                               \
 782           fprintf ((FILE), "\n");                                       \
 783         }                                                               \
 784       fprintf ((FILE), "%s", COMMON_ASM_OP);                            \
 785       assemble_name ((FILE), (NAME));                                   \
 786       fprintf ((FILE), ",%u,%u\n", (int)(SIZE), align_);                \
 787     }                                                                   \
 788   while (0)
 789
 790 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
 791  CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 0)
 792
 793 #undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
 794 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
 795  CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 1)
 796
 797 /* Node: Label Output */
 798
 799 /* Globalizing directive for a label.  */
 800 #define GLOBAL_ASM_OP "\t.global "
 801
 802 #define SUPPORTS_WEAK 1
 803
 804 #define ASM_OUTPUT_SYMBOL_REF(STREAM, SYM) \
 805  cris_asm_output_symbol_ref (STREAM, SYM)
 806
 807 #define ASM_OUTPUT_LABEL_REF(STREAM, BUF) \
 808  cris_asm_output_label_ref (STREAM, BUF)
 809
 810 /* Remove any previous definition (elfos.h).  */
 811 #undef ASM_GENERATE_INTERNAL_LABEL
 812 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 813   sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long) NUM)
 814
 815 /* Node: Initialization */
 816 /* (no definitions) */
 817
 818 /* Node: Macros for Initialization */
 819 /* (no definitions) */
 820
 821 /* Node: Instruction Output */
 822
 823 #define REGISTER_NAMES                                  \
 824  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", \
 825   "r9", "r10", "r11", "r12", "r13", "sp", "pc", "srp", "mof", "faked_ap", "dccr"}
 826
 827 #define ADDITIONAL_REGISTER_NAMES \
 828  {{"r14", 14}, {"r15", 15}}
 829
 830 /* Output an empty line to illustrate the presence of the delay slot.  */
 831 #define DBR_OUTPUT_SEQEND(FILE) \
 832   fprintf (FILE, "\n")
 833
 834 #define LOCAL_LABEL_PREFIX "."
 835
 836 /* cppinit.c initializes a const array from this, so it must be constant,
 837    can't have it different based on options.  Luckily, the prefix is
 838    always allowed, so let's have it on all GCC-generated code.  Note that
 839    we have this verbatim everywhere in the back-end, not using %R or %s or
 840    such.  */
 841 #define REGISTER_PREFIX "$"
 842
 843 /* Remove any previous definition (elfos.h).  */
 844 /* We use -fno-leading-underscore to remove it, when necessary.  */
 845 #undef USER_LABEL_PREFIX
 846 #define USER_LABEL_PREFIX "_"
 847
 848 #define ASM_OUTPUT_REG_PUSH(FILE, REGNO)                                \
 849   fprintf (FILE, "\tpush $%s\n", reg_names[REGNO])
 850
 851 #define ASM_OUTPUT_REG_POP(FILE, REGNO) \
 852   fprintf (FILE, "\tmove [$sp+],$%s\n", reg_names[REGNO])
 853
 854
 855 /* Node: Dispatch Tables */
 856
 857 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL)                \
 858   asm_fprintf (FILE, "\t.word %LL%d-%LL%d\n", VALUE, REL)
 859
 860 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
 861   asm_fprintf (FILE, "\t.dword %LL%d\n", VALUE)
 862
 863 /* Defined to also emit an .align in elfos.h.  We don't want that.  */
 864 #undef ASM_OUTPUT_CASE_LABEL
 865
 866 /* Since the "bound" insn loads the comparison value if the compared<
 867    value (register) is out of bounds (0..comparison value-1), we need
 868    to output another case to catch it.
 869    The way to find it is to look for the label_ref at the else-arm inside
 870    the expanded casesi core-insn.
 871    FIXME: Check this construct when changing to new version of gcc.  */
 872 #define ASM_OUTPUT_CASE_END(STREAM, NUM, TABLE)                         \
 873   cris_asm_output_case_end (STREAM, NUM, TABLE)
 874
 875
 876 /* Node: Exception Region Output */
 877 /* (no definitions) */
 878 /* FIXME: Fill in with our own optimized layout.  */
 879
 880 /* Node: Alignment Output */
 881
 882 #define ASM_OUTPUT_ALIGN(FILE, LOG)  \
 883  fprintf (FILE, "\t.align %d\n", (LOG))
 884
 885
 886 /* Node: All Debuggers */
 887
 888 #define DBX_REGISTER_NUMBER(REGNO)                              \
 889  ((REGNO) == CRIS_SRP_REGNUM ? CRIS_CANONICAL_SRP_REGNUM :      \
 890   (REGNO) == CRIS_MOF_REGNUM ? CRIS_CANONICAL_MOF_REGNUM :      \
 891   (REGNO) == CRIS_CC0_REGNUM ? CRIS_CANONICAL_CC0_REGNUM :      \
 892  (REGNO))
 893
 894 /* FIXME: Investigate DEBUGGER_AUTO_OFFSET, DEBUGGER_ARG_OFFSET.  */
 895
 896
 897 /* Node: DBX Options */
 898
 899 /* Is this correct? Check later.  */
 900 #define DBX_NO_XREFS
 901
 902 #define DBX_CONTIN_LENGTH 0
 903
 904 /* FIXME: Is this needed when we have 0 DBX_CONTIN_LENGTH?  */
 905 #define DBX_CONTIN_CHAR '?'
 906
 907
 908 /* Node: DBX Hooks */
 909 /* (no definitions) */
 910
 911 /* Node: File names and DBX */
 912 /* (no definitions) */
 913
 914
 915 /* Node: DWARF */
 916 /* (no definitions) */
 917
 918 /* Node: Misc */
 919
 920 /* A combination of the bound (umin) insn together with a
 921    sign-extended add via the table to PC seems optimal.
 922    If the table overflows, the assembler will take care of it.
 923    Theoretically, in extreme cases (uncertain if they occur), an error
 924    will be emitted, so FIXME: Check how large case-tables are emitted,
 925    possible add an option to emit SImode case-tables.  */
 926 #define CASE_VECTOR_MODE HImode
 927
 928 #define CASE_VECTOR_PC_RELATIVE 1
 929
 930 /* FIXME: Investigate CASE_VECTOR_SHORTEN_MODE to make sure HImode is not
 931    used when broken-.word could possibly fail (plus testcase).  */
 932
 933 /* This is the number of bytes that can be moved in one
 934    reasonably fast instruction sequence.  For CRIS, this is two
 935    instructions: mem => reg, reg => mem.  */
 936 #define MOVE_MAX 4
 937
 938 /* Maybe SHIFT_COUNT_TRUNCATED is safe to define?  FIXME: Check later.  */
 939
 940 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
 941 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
 942
 943 #define Pmode SImode
 944
 945 #define FUNCTION_MODE QImode
 946
 947 /*
 948  * Local variables:
 949  * eval: (c-set-style "gnu")
 950  * indent-tabs-mode: t
 951  * End:
 952  */