gcc/config/cris/cris.h

   1 /* Definitions for GCC.  Part of the machine description for CRIS.
   2    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* After the first "Node:" comment comes all preprocessor directives and
  23    attached declarations described in the info files, the "Using and
  24    Porting GCC" manual (uapgcc), in the same order as found in the "Target
  25    macros" section in the gcc-2.9x CVS edition of 2000-03-17.  FIXME: Not
  26    really, but needs an update anyway.
  27
  28    There is no generic copy-of-uapgcc comment, you'll have to see uapgcc
  29    for that.  If applicable, there is a CRIS-specific comment.  The order
  30    of macro definitions follow the order in the manual.  Every section in
  31    the manual (node in the info pages) has an introductory `Node:
  32    <subchapter>' comment.  If no macros are defined for a section, only
  33    the section-comment is present.  */
  34
  35 /* Note that other header files (e.g. config/elfos.h, config/linux.h,
  36    config/cris/linux.h and config/cris/aout.h) are responsible for lots of
  37    settings not repeated below.  This file contains general CRIS
  38    definitions and definitions for the cris-*-elf subtarget.  */
  39
  40 /* Replacement for REG_P since it does not match SUBREGs.  Happens for
  41    testcase Axis-20000320 with gcc-2.9x.  */
  42 #define REG_S_P(x) \
  43  (REG_P (x) || (GET_CODE (x) == SUBREG && REG_P (XEXP (x, 0))))
  44
  45 /* Last register in main register bank r0..r15.  */
  46 #define CRIS_LAST_GENERAL_REGISTER 15
  47
  48 /* Descriptions of registers used for arguments.  */
  49 #define CRIS_FIRST_ARG_REG 10
  50 #define CRIS_MAX_ARGS_IN_REGS 4
  51
  52 /* Other convenience definitions.  */
  53 #define CRIS_PC_REGNUM 15
  54 #define CRIS_SRP_REGNUM 16
  55
  56 /* Most of the time, we need the index into the register-names array.
  57    When passing debug-info, we need the real register number.  */
  58 #define CRIS_CANONICAL_SRP_REGNUM (16 + 11)
  59 #define CRIS_CANONICAL_MOF_REGNUM (16 + 7)
  60
  61 /* When generating PIC, these suffixes are added to the names of non-local
  62    functions when being output.  Contrary to other ports, we have offsets
  63    relative to the GOT, not the PC.  We might implement PC-relative PLT
  64    semantics later for the general case; they are used in some cases right
  65    now, such as MI thunks.  */
  66 #define CRIS_GOTPLT_SUFFIX ":GOTPLT"
  67 #define CRIS_PLT_GOTOFFSET_SUFFIX ":PLTG"
  68 #define CRIS_PLT_PCOFFSET_SUFFIX ":PLT"
  69
  70 /* If you tweak this, don't forget to check cris_expand_builtin_va_arg.  */
  71 #define CRIS_FUNCTION_ARG_SIZE(MODE, TYPE)      \
  72   ((MODE) != BLKmode ? GET_MODE_SIZE (MODE)     \
  73    : (unsigned) int_size_in_bytes (TYPE))
  74
  75 /* Check for max allowed stackframe. A "const char *" to be parsed.  */
  76 extern const char *cris_max_stackframe_str;
  77
  78 /* Which CPU version this is.  A "const char *" to be parsed.  */
  79 extern const char *cris_cpu_str;
  80
  81 /* Which CPU version this is.  The parsed and adjusted cris_cpu_str.  */
  82 extern int cris_cpu_version;
  83
  84 /* Which CPU version to tune for.  A "const char *" to be parsed.  */
  85 extern const char *cris_tune_str;
  86
  87 /* The argument to "-melinux-stacksize=".  We don't parse it currently;
  88    it's just passed on to the linker.  We might want to do something
  89    here someday.  */
  90 extern const char *cris_elinux_stacksize_str;
  91
  92 /* Changing the order used to be necessary to put the fourth __make_dp
  93    argument (a DImode parameter) in registers, to fit with the libfunc
  94    parameter passing scheme used for intrinsic functions.  FIXME: Check
  95    performance and maybe remove definition from TARGET_LIBGCC2_CFLAGS now
  96    that it isn't strictly necessary.  We used to do this through
  97    TARGET_LIBGCC2_CFLAGS, but that became increasingly difficult as the
  98    parenthesis (that needed quoting) travels through several layers of
  99    make and shell invocations.  */
 100 #ifdef IN_LIBGCC2
 101 #define __make_dp(a,b,c,d) __cris_make_dp(d,a,b,c)
 102 #endif
 103
 104
 105 /* Node: Driver */
 106
 107 /* When using make with defaults.mak for Sun this will handily remove
 108    any "-target sun*" switches.  */
 109 /* We need to override any previous definitions (linux.h) */
 110 #undef WORD_SWITCH_TAKES_ARG
 111 #define WORD_SWITCH_TAKES_ARG(STR)              \
 112  (DEFAULT_WORD_SWITCH_TAKES_ARG (STR)           \
 113   || !strcmp (STR, "target"))
 114
 115 /* Also provide canonical vN definitions when user specifies an alias.
 116    Note that -melf overrides -maout.  */
 117
 118 #define CPP_SPEC \
 119  "%{mtune=*:-D__tune_%* %{mtune=v*:-D__CRIS_arch_tune=%*}}\
 120    %{mtune=etrax4:-D__tune_v3 -D__CRIS_arch_tune=3}\
 121    %{mtune=etrax100:-D__tune_v8 -D__CRIS_arch_tune=8}\
 122    %{mtune=svinto:-D__tune_v8 -D__CRIS_arch_tune=8}\
 123    %{mtune=etrax100lx:-D__tune_v10 -D__CRIS_arch_tune=10}\
 124    %{mtune=ng:-D__tune_v10 -D__CRIS_arch_tune=10}\
 125   %{mcpu=*:-D__arch_%* %{mcpu=v*:-D__CRIS_arch_version=%*}}\
 126    %{mcpu=etrax4:-D__arch_v3 -D__CRIS_arch_version=3}\
 127    %{mcpu=etrax100:-D__arch_v8 -D__CRIS_arch_version=8}\
 128    %{mcpu=svinto:-D__arch_v8 -D__CRIS_arch_version=8}\
 129    %{mcpu=etrax100lx:-D__arch_v10 -D__CRIS_arch_version=10}\
 130    %{mcpu=ng:-D__arch_v10 -D__CRIS_arch_version=10}\
 131   %{march=*:-D__arch_%* %{march=v*:-D__CRIS_arch_version=%*}}\
 132    %{march=etrax4:-D__arch_v3 -D__CRIS_arch_version=3}\
 133    %{march=etrax100:-D__arch_v8 -D__CRIS_arch_version=8}\
 134    %{march=svinto:-D__arch_v8 -D__CRIS_arch_version=8}\
 135    %{march=etrax100lx:-D__arch_v10 -D__CRIS_arch_version=10}\
 136    %{march=ng:-D__arch_v10 -D__CRIS_arch_version=10}\
 137   %{metrax100:-D__arch__v8 -D__CRIS_arch_version=8}\
 138   %{metrax4:-D__arch__v3 -D__CRIS_arch_version=3}\
 139   %(cpp_subtarget)"
 140
 141 /* For the cris-*-elf subtarget.  */
 142 #define CRIS_CPP_SUBTARGET_SPEC \
 143  "%{mbest-lib-options:\
 144    %{!moverride-best-lib-options:\
 145     %{!march=*:%{!metrax*:%{!mcpu=*:-D__tune_v10 -D__CRIS_arch_tune=10}}}}}"
 146
 147 /* Remove those Sun-make "target" switches.  */
 148 /* Override previous definitions (linux.h).  */
 149 #undef CC1_SPEC
 150 #define CC1_SPEC \
 151  "%{target*:}\
 152   %{metrax4:-march=v3}\
 153   %{metrax100:-march=v8}\
 154   %(cc1_subtarget)"
 155
 156 /* For the cris-*-elf subtarget.  */
 157 #define CRIS_CC1_SUBTARGET_SPEC \
 158  "-melf\
 159   %{mbest-lib-options:\
 160    %{!moverride-best-lib-options:\
 161     %{!march=*:%{!mcpu=*:-mtune=v10 -D__CRIS_arch_tune=10}}\
 162     %{!finhibit-size-directive:\
 163       %{!fno-function-sections: -ffunction-sections}\
 164       %{!fno-data-sections: -fdata-sections}}}}"
 165
 166 /* This adds to CC1_SPEC.  When bugs are removed from -fvtable-gc
 167    (-fforce-addr causes invalid .vtable_entry asm in tinfo.cc and
 168    nothing at all works in GCC 3.0-pre), add this line:
 169    "%{mbest-lib-options:%{!moverride-best-lib-options:\
 170    %{!melinux:%{!maout|melf:%{!fno-vtable-gc:-fvtable-gc}}}}}".  */
 171 #define CC1PLUS_SPEC ""
 172
 173 /* Override previous definitions (linux.h).  */
 174 #undef ASM_SPEC
 175 #define ASM_SPEC \
 176  "%{v:-v}\
 177   %(asm_subtarget)"
 178
 179 /* For the cris-*-elf subtarget.  */
 180 #define CRIS_ASM_SUBTARGET_SPEC "--em=criself"
 181
 182 /* FIXME: We should propagate the -melf option to make the criself
 183    "emulation" unless a linker script is provided (-T*), but I don't know
 184    how to do that if either of -Ttext, -Tdata or -Tbss is given but no
 185    linker script, as is usually the case.  Leave it to the user for the
 186    time being.
 187
 188    Note that -melf overrides -maout except that a.out-compiled libraries
 189    are linked in (multilibbing).  The somewhat cryptic -rpath-link pair is
 190    to avoid *only* picking up the linux multilib subdir from the "-B./"
 191    option during build, while still giving it preference.  We'd need some
 192    %s-variant that checked for existence of some specific file.  */
 193 /* Override previous definitions (svr4.h).  */
 194 #undef LINK_SPEC
 195 #define LINK_SPEC \
 196  "%{v:--verbose}\
 197   %(link_subtarget)"
 198
 199 /* For the cris-*-elf subtarget.  */
 200 #define CRIS_LINK_SUBTARGET_SPEC \
 201  "-mcriself\
 202   %{sim2:%{!T*:-Tdata 0x4000000 -Tbss 0x8000000}}\
 203   %{!r:%{O2|O3: --gc-sections}}"
 204
 205 /* Which library to get.  The only difference from the default is to get
 206    libsc.a if -sim is given to the driver.  Repeat -lc -lsysX
 207    {X=sim,linux}, because libsysX needs (at least) errno from libc, and
 208    then we want to resolve new unknowns in libc against libsysX, not
 209    libnosys.  */
 210 /* Override previous definitions (linux.h).  */
 211 #undef LIB_SPEC
 212 #define LIB_SPEC \
 213  "%{sim*:-lc -lsyssim -lc -lsyssim}\
 214   %{!sim*:%{g*:-lg}\
 215     %{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} -lbsp}\
 216   -lnosys"
 217
 218 /* Linker startfile options; crt0 flavors.
 219
 220    At the moment there are no gcrt0.o or mcrt0.o, but keep them here and
 221    link them to crt0.o to be prepared.  Use scrt0.c if running the
 222    simulator, linear style, or s2crt0.c if fixed style.  */
 223 /* We need to remove any previous definition (elfos.h).  */
 224 #undef STARTFILE_SPEC
 225 #define STARTFILE_SPEC \
 226  "%{sim2:s2crt0.o%s}\
 227   %{!sim2:%{sim:scrt0.o%s}\
 228    %{!sim:%{pg:gcrt0.o%s}\
 229     %{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}}\
 230   crtbegin.o%s"
 231
 232 #undef ENDFILE_SPEC
 233 #define ENDFILE_SPEC "crtend.o%s"
 234
 235 #define EXTRA_SPECS                             \
 236   {"cpp_subtarget", CRIS_CPP_SUBTARGET_SPEC},   \
 237   {"cc1_subtarget", CRIS_CC1_SUBTARGET_SPEC},   \
 238   {"asm_subtarget", CRIS_ASM_SUBTARGET_SPEC},   \
 239   {"link_subtarget", CRIS_LINK_SUBTARGET_SPEC}, \
 240   CRIS_SUBTARGET_EXTRA_SPECS
 241
 242 #define CRIS_SUBTARGET_EXTRA_SPECS
 243
 244
 245 /* Node: Run-time Target */
 246
 247 #define TARGET_CPU_CPP_BUILTINS()               \
 248   do                                            \
 249     {                                           \
 250       builtin_define_std ("cris");              \
 251       builtin_define_std ("CRIS");              \
 252       builtin_define_std ("GNU_CRIS");          \
 253       builtin_define ("__CRIS_ABI_version=2");  \
 254       builtin_assert ("cpu=cris");              \
 255       builtin_assert ("machine=cris");          \
 256     }                                           \
 257   while (0)
 258
 259 /* This needs to be at least 32 bits.  */
 260 extern int target_flags;
 261
 262 /* Currently this just affects alignment.  FIXME:  Redundant with
 263    TARGET_ALIGN_BY_32, or put machine stuff here?  */
 264 #define TARGET_MASK_SVINTO 1
 265 #define TARGET_SVINTO (target_flags & TARGET_MASK_SVINTO)
 266
 267 /* If to use condition-codes generated by insns other than the
 268    immediately preceding compare/test insn.
 269     Used to check for errors in notice_update_cc.  */
 270 #define TARGET_MASK_CCINIT 2
 271 #define TARGET_CCINIT (target_flags & TARGET_MASK_CCINIT)
 272
 273 /* Debug option.  */
 274 #define TARGET_MASK_PDEBUG 4
 275 #define TARGET_PDEBUG (target_flags & TARGET_MASK_PDEBUG)
 276
 277 /* If to use side-effect patterns.  Used to debug the [rx=ry+i] type
 278    patterns.  */
 279 #define TARGET_MASK_SIDE_EFFECT_PREFIXES 8
 280 #define TARGET_SIDE_EFFECT_PREFIXES \
 281  (target_flags & TARGET_MASK_SIDE_EFFECT_PREFIXES)
 282
 283 /* If to expand mul into mstep.  Only used when making libc.a.  */
 284 #define TARGET_MASK_EXPAND_MUL 16
 285 #define TARGET_EXPAND_MUL (target_flags & TARGET_MASK_EXPAND_MUL)
 286
 287 /* If to *keep* (not force) alignment of stack at 16 bits.  */
 288 #define TARGET_MASK_STACK_ALIGN 32
 289 #define TARGET_STACK_ALIGN (target_flags & TARGET_MASK_STACK_ALIGN)
 290
 291 /* If to do alignment on individual non-modifiable objects.  */
 292 #define TARGET_MASK_CONST_ALIGN 64
 293 #define TARGET_CONST_ALIGN (target_flags & TARGET_MASK_CONST_ALIGN)
 294
 295 /* If to do alignment on individual modifiable objects.  */
 296 #define TARGET_MASK_DATA_ALIGN 128
 297 #define TARGET_DATA_ALIGN (target_flags & TARGET_MASK_DATA_ALIGN)
 298
 299 /* If not to omit function prologue and epilogue.  */
 300 #define TARGET_MASK_PROLOGUE_EPILOGUE 256
 301 #define TARGET_PROLOGUE_EPILOGUE (target_flags & TARGET_MASK_PROLOGUE_EPILOGUE)
 302
 303 /* Instructions additions from Etrax 4 and up.
 304    (Just "lz", which we don't really generate from GCC -- yet).  */
 305 #define TARGET_MASK_ETRAX4_ADD 512
 306 #define TARGET_ETRAX4_ADD (target_flags & TARGET_MASK_ETRAX4_ADD)
 307
 308 /* Say that all alignment specifications say to prefer 32 rather
 309    than 16 bits.  */
 310 #define TARGET_MASK_ALIGN_BY_32 1024
 311 #define TARGET_ALIGN_BY_32 (target_flags & TARGET_MASK_ALIGN_BY_32)
 312
 313 /* This condition is of limited use, as gcc is riddled with #ifdef:s
 314    controlling this, rather than if (...):s.  */
 315 #define TARGET_MASK_ELF 2048
 316 #define TARGET_ELF (target_flags & TARGET_MASK_ELF)
 317
 318 /* Currently just used to error-check other options.  Note that this is
 319    *not* set for -melinux.  */
 320 #define TARGET_MASK_LINUX 4096
 321 #define TARGET_LINUX (target_flags & TARGET_MASK_LINUX)
 322
 323 /* There's a small setup cost with using GOTPLT references, but should
 324    in total be a win both in code-size and execution-time.  */
 325 #define TARGET_MASK_AVOID_GOTPLT 8192
 326 #define TARGET_AVOID_GOTPLT (target_flags & TARGET_MASK_AVOID_GOTPLT)
 327
 328 #define TARGET_SWITCHES                                                 \
 329  {                                                                      \
 330   /* No "no-etrax" as it does not really imply any model.               \
 331      On the other hand, "etrax" implies the common (and large)          \
 332      subset matching all models.  */                                    \
 333   {"etrax4",                             TARGET_MASK_ETRAX4_ADD,        \
 334    N_("Compile for ETRAX 4 (CRIS v3)")},                                \
 335   {"no-etrax4",                         -TARGET_MASK_ETRAX4_ADD, ""},   \
 336   {"etrax100",                       (TARGET_MASK_SVINTO                \
 337                                       + TARGET_MASK_ETRAX4_ADD          \
 338                                       + TARGET_MASK_ALIGN_BY_32),       \
 339    N_("Compile for ETRAX 100 (CRIS v8)")},                              \
 340   {"no-etrax100",                   -(TARGET_MASK_SVINTO                \
 341                                       + TARGET_MASK_ETRAX4_ADD), ""},   \
 342   {"pdebug",                                 TARGET_MASK_PDEBUG,        \
 343    N_("Emit verbose debug information in assembly code")},              \
 344   {"no-pdebug",                             -TARGET_MASK_PDEBUG, ""},   \
 345   {"cc-init",                                TARGET_MASK_CCINIT,        \
 346    N_("Do not use condition codes from normal instructions")},          \
 347   {"no-cc-init",                            -TARGET_MASK_CCINIT, ""},   \
 348   {"side-effects",             TARGET_MASK_SIDE_EFFECT_PREFIXES, ""},   \
 349   {"no-side-effects",         -TARGET_MASK_SIDE_EFFECT_PREFIXES,        \
 350    N_("Do not emit addressing modes with side-effect assignment")},     \
 351   {"stack-align",                       TARGET_MASK_STACK_ALIGN, ""},   \
 352   {"no-stack-align",                   -TARGET_MASK_STACK_ALIGN,        \
 353    N_("Do not tune stack alignment")},                                  \
 354   {"data-align",                         TARGET_MASK_DATA_ALIGN, ""},   \
 355   {"no-data-align",                     -TARGET_MASK_DATA_ALIGN,        \
 356    N_("Do not tune writable data alignment")},                          \
 357   {"const-align",                       TARGET_MASK_CONST_ALIGN, ""},   \
 358   {"no-const-align",                   -TARGET_MASK_CONST_ALIGN,        \
 359    N_("Do not tune code and read-only data alignment")},                \
 360   {"32-bit",                        (TARGET_MASK_STACK_ALIGN            \
 361                                      + TARGET_MASK_CONST_ALIGN          \
 362                                      + TARGET_MASK_DATA_ALIGN           \
 363                                      + TARGET_MASK_ALIGN_BY_32), ""},   \
 364   {"32bit",                         (TARGET_MASK_STACK_ALIGN            \
 365                                      + TARGET_MASK_CONST_ALIGN          \
 366                                      + TARGET_MASK_DATA_ALIGN           \
 367                                      + TARGET_MASK_ALIGN_BY_32),        \
 368    N_("Align code and data to 32 bits")},                               \
 369   {"16-bit",                         (TARGET_MASK_STACK_ALIGN           \
 370                                       + TARGET_MASK_CONST_ALIGN         \
 371                                       + TARGET_MASK_DATA_ALIGN), ""},   \
 372   {"16bit",                          (TARGET_MASK_STACK_ALIGN           \
 373                                       + TARGET_MASK_CONST_ALIGN         \
 374                                       + TARGET_MASK_DATA_ALIGN), ""},   \
 375   {"8-bit",                         -(TARGET_MASK_STACK_ALIGN           \
 376                                       + TARGET_MASK_CONST_ALIGN         \
 377                                       + TARGET_MASK_DATA_ALIGN), ""},   \
 378   {"8bit",                          -(TARGET_MASK_STACK_ALIGN           \
 379                                       + TARGET_MASK_CONST_ALIGN         \
 380                                       + TARGET_MASK_DATA_ALIGN),        \
 381    N_("Don't align items in code or data")},                            \
 382   {"prologue-epilogue",           TARGET_MASK_PROLOGUE_EPILOGUE, ""},   \
 383   {"no-prologue-epilogue",       -TARGET_MASK_PROLOGUE_EPILOGUE,        \
 384    N_("Do not emit function prologue or epilogue")},                    \
 385   /* We have to handle this m-option here since we can't wash it off in \
 386      both CC1_SPEC and CC1PLUS_SPEC.  */                                \
 387   {"best-lib-options",                                        0,        \
 388  N_("Use the most feature-enabling options allowed by other options")}, \
 389                                                                         \
 390   /* We must call it "override-" since calling it "no-" will cause      \
 391      gcc.c to forget it, if there's a "later" -mbest-lib-options.       \
 392      Kludgy, but needed for some multilibbed files.  */                 \
 393   {"override-best-lib-options",                               0,        \
 394    N_("Override -mbest-lib-options")},                                  \
 395   CRIS_SUBTARGET_SWITCHES                                               \
 396   {"",                  TARGET_DEFAULT | CRIS_SUBTARGET_DEFAULT, ""}}   \
 397
 398 /* For the cris-*-elf subtarget.  */
 399 #define CRIS_SUBTARGET_SWITCHES \
 400  {"elf", 0, ""},
 401
 402 /* Default target_flags if no switches specified.  */
 403 #ifndef TARGET_DEFAULT
 404 # define TARGET_DEFAULT \
 405  (TARGET_MASK_SIDE_EFFECT_PREFIXES + TARGET_MASK_STACK_ALIGN \
 406   + TARGET_MASK_CONST_ALIGN + TARGET_MASK_DATA_ALIGN \
 407   + TARGET_MASK_PROLOGUE_EPILOGUE)
 408 #endif
 409
 410 /* For the cris-*-elf subtarget.  */
 411 #define CRIS_SUBTARGET_DEFAULT TARGET_MASK_ELF
 412
 413 #define CRIS_CPU_BASE 0
 414 #define CRIS_CPU_ETRAX4 3       /* Just lz added.  */
 415 #define CRIS_CPU_SVINTO 8       /* Added swap, jsrc & Co., 32-bit accesses.  */
 416 #define CRIS_CPU_NG 10          /* Added mul[su].  */
 417
 418 /* Local, providing a default for cris_cpu_version.  */
 419 #define CRIS_DEFAULT_CPU_VERSION CRIS_CPU_BASE
 420
 421 #define TARGET_HAS_MUL_INSNS (cris_cpu_version >= CRIS_CPU_NG)
 422
 423 #define TARGET_OPTIONS                                                  \
 424  {{"cpu=", &cris_cpu_str, "", 0},                                       \
 425   {"arch=", &cris_cpu_str,                                              \
 426    N_("Generate code for the specified chip or CPU version"), 0},       \
 427   {"tune=", &cris_tune_str,                                             \
 428    N_("Tune alignment for the specified chip or CPU version"), 0},      \
 429   {"max-stackframe=", &cris_max_stackframe_str,                         \
 430    N_("Warn when a stackframe is larger than the specified size"), 0},  \
 431   CRIS_SUBTARGET_LONG_OPTIONS                                           \
 432   {"ax-stackframe=", &cris_max_stackframe_str, "", 0} }
 433
 434 #define CRIS_SUBTARGET_LONG_OPTIONS
 435
 436 /* Print subsidiary information on the compiler version in use.
 437    Do not use VD.D syntax (D=digit), since this will cause confusion
 438    with the base gcc version among users, when we ask which version of
 439    gcc-cris they are using.  Please use some flavor of "R<number>" for
 440    the version (no need for major.minor versions, I believe).  */
 441 #define TARGET_VERSION \
 442  fprintf (stderr, " [Axis CRIS%s]", CRIS_SUBTARGET_VERSION)
 443
 444 /* For the cris-*-elf subtarget.  */
 445 #define CRIS_SUBTARGET_VERSION " - generic ELF"
 446
 447 #define OVERRIDE_OPTIONS cris_override_options ()
 448
 449 /* The following gives optimal code for gcc-2.7.2, but *may* be subject
 450    to change.  Omitting flag_force_addr gives .1-.7% faster code for gcc
 451    *only*, but 1.3% larger code.  On ipps it gives 5.3-10.6% slower
 452    code(!) and 0.3% larger code.  For products, images gets .1-1.8%
 453    larger.  Do not set strict aliasing from optimization options.  */
 454 #define OPTIMIZATION_OPTIONS(OPTIMIZE, SIZE)    \
 455   do                                            \
 456     {                                           \
 457       if ((OPTIMIZE) >= 2 || (SIZE))            \
 458         {                                       \
 459           flag_force_addr = 1;                  \
 460           flag_omit_frame_pointer = 1;          \
 461         }                                       \
 462     }                                           \
 463   while (0)
 464
 465
 466 /* Node: Storage Layout */
 467
 468 #define BITS_BIG_ENDIAN 0
 469
 470 #define BYTES_BIG_ENDIAN 0
 471
 472 /* WORDS_BIG_ENDIAN is not defined in the hardware, but for consistency,
 473    we use little-endianness, and we may also be able to use
 474    post-increment on DImode indirect.  */
 475 #define WORDS_BIG_ENDIAN 0
 476
 477 #define UNITS_PER_WORD 4
 478
 479 /* A combination of defining PROMOTE_MODE, PROMOTE_FUNCTION_ARGS,
 480    PROMOTE_FOR_CALL_ONLY and *not* defining PROMOTE_PROTOTYPES gives the
 481    best code size and speed for gcc, ipps and products in gcc-2.7.2.  */
 482 #define CRIS_PROMOTED_MODE(MODE, UNSIGNEDP, TYPE) \
 483  (GET_MODE_CLASS (MODE) == MODE_INT && GET_MODE_SIZE (MODE) < 4) \
 484   ? SImode : MODE
 485
 486 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)  \
 487   (MODE) = CRIS_PROMOTED_MODE (MODE, UNSIGNEDP, TYPE)
 488
 489 #define PROMOTE_FUNCTION_ARGS
 490
 491 /* Defining PROMOTE_FUNCTION_RETURN in gcc-2.7.2 uncovers bug 981110 (even
 492    if defining FUNCTION_VALUE with MODE as PROMOTED_MODE ;-)
 493
 494    FIXME: Report this when cris.h is part of GCC, so others can easily
 495    see the problem.  Maybe check other systems that define
 496    PROMOTE_FUNCTION_RETURN.  */
 497 #define PROMOTE_FOR_CALL_ONLY
 498
 499 /* We will be using prototype promotion, so they will be 32 bit.  */
 500 #define PARM_BOUNDARY 32
 501
 502 /* Stack boundary is guided by -mstack-align, -mno-stack-align,
 503    -malign.
 504    Old comment: (2.1: still valid in 2.7.2?)
 505     Note that to make this macro affect the alignment of stack
 506    locals, a fix was required, and special precautions when handling
 507    the stack pointer in various other macros (TARGET_ASM_FUNCTION_PROLOGUE
 508    et al) were required.  See file "function.c".  If you would just define
 509    this macro, it would only affect the builtin alloca and variable
 510    local data (non-ANSI, non-K&R, Gnu C extension).  */
 511 #define STACK_BOUNDARY \
 512  (TARGET_STACK_ALIGN ? (TARGET_ALIGN_BY_32 ? 32 : 16) : 8)
 513
 514 #define FUNCTION_BOUNDARY 16
 515
 516 /* Do not change BIGGEST_ALIGNMENT (when optimizing), as it will affect
 517    strange places, at least in 2.1.  */
 518 #define BIGGEST_ALIGNMENT 8
 519
 520 /* If -m16bit,  -m16-bit, -malign or -mdata-align,
 521    align everything to 16 bit.  */
 522 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN)                       \
 523  (TARGET_DATA_ALIGN                                             \
 524   ? (TARGET_ALIGN_BY_32                                         \
 525      ? (BASIC_ALIGN < 32 ? 32 : BASIC_ALIGN)                    \
 526      : (BASIC_ALIGN < 16 ? 16 : BASIC_ALIGN)) : BASIC_ALIGN)
 527
 528 /* Note that CONSTANT_ALIGNMENT has the effect of making gcc believe that
 529    ALL references to constant stuff (in code segment, like strings) has
 530    this alignment.  That is a rather rushed assumption.  Luckily we do not
 531    care about the "alignment" operand to builtin memcpy (only place where
 532    it counts), so it doesn't affect any bad spots.  */
 533 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN)               \
 534  (TARGET_CONST_ALIGN                                            \
 535   ? (TARGET_ALIGN_BY_32                                         \
 536      ? (BASIC_ALIGN < 32 ? 32 : BASIC_ALIGN)                    \
 537      : (BASIC_ALIGN < 16 ? 16 : BASIC_ALIGN)) : BASIC_ALIGN)
 538
 539 /* FIXME: Define LOCAL_ALIGNMENT for word and dword or arrays and
 540    structures (if -mstack-align=), and check that it is good.  */
 541
 542 #define EMPTY_FIELD_BOUNDARY 8
 543
 544 #define STRUCTURE_SIZE_BOUNDARY 8
 545
 546 #define STRICT_ALIGNMENT 0
 547
 548 /* Remove any previous definition (elfos.h).
 549    ??? If it wasn't for all the other stuff that affects layout of
 550    structures and bit-fields, this could presumably cause incompatibility
 551    with other GNU/Linux ports (i.e. elfos.h users).  */
 552 #undef PCC_BITFIELD_TYPE_MATTERS
 553
 554 /* This is only used for non-scalars.  Strange stuff happens to structs
 555    (FIXME: What?) if we use anything larger than largest actually used
 556    datum size, so lets make it 32.  The type "long long" will still work
 557    as usual.  We can still have DImode insns, but they will only be used
 558    for scalar data (i.e. long long).  */
 559 #define MAX_FIXED_MODE_SIZE 32
 560
 561
 562 /* Node: Type Layout */
 563
 564 /* Note that DOUBLE_TYPE_SIZE is not defined anymore, since the default
 565    value gives a 64-bit double, which is what we now use.  */
 566
 567 /* For compatibility and historical reasons, a char should be signed.  */
 568 #define DEFAULT_SIGNED_CHAR 1
 569
 570 /* No DEFAULT_SHORT_ENUMS, please.  */
 571
 572 /* Note that WCHAR_TYPE_SIZE is used in cexp.y,
 573    where TARGET_SHORT is not available.  */
 574 #undef WCHAR_TYPE
 575 #define WCHAR_TYPE "long int"
 576
 577 #undef WCHAR_TYPE_SIZE
 578 #define WCHAR_TYPE_SIZE 32
 579
 580
 581 /* Node: Register Basics */
 582
 583 /*  We count all 16 non-special registers, SRP and a faked argument
 584     pointer register.  */
 585 #define FIRST_PSEUDO_REGISTER (16 + 1 + 1)
 586
 587 /* For CRIS, these are r15 (pc) and r14 (sp). Register r8 is used as a
 588    frame-pointer, but is not fixed.  SRP is not included in general
 589    registers and will not be used automatically.  All other special
 590    registers are fixed at the moment.  The faked argument pointer register
 591    is fixed too.  */
 592 #define FIXED_REGISTERS \
 593  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1}
 594
 595 /* Register r9 is used for structure-address, r10-r13 for parameters,
 596    r10- for return values.  */
 597 #define CALL_USED_REGISTERS \
 598  {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1}
 599
 600 #define CONDITIONAL_REGISTER_USAGE cris_conditional_register_usage ()
 601
 602
 603 /* Node: Allocation Order */
 604
 605 /* We need this on CRIS, because call-used regs should be used first,
 606    (so we don't need to push).  Else start using registers from r0 and up.
 607     This preference is mainly because if we put call-used-regs from r0
 608    and up, then we can't use movem to push the rest, (which have to be
 609    saved if we use them, and movem has to start with r0).
 610    Change here if you change which registers to use as call registers.
 611
 612    The actual need to explicitly prefer call-used registers improved the
 613    situation a lot for 2.1, but might not actually be needed anymore.
 614    Still, this order reflects what GCC should find out by itself, so it
 615    probably does not hurt.
 616
 617    Order of preference: Call-used-regs first, then r0 and up, last fp &
 618    sp & pc as fillers.
 619    Call-used regs in opposite order, so they will cause less conflict if
 620    a function has few args (<= 3) and it wants a scratch reg.
 621     Use struct-return address first, since very few functions use
 622    structure return values so it is likely to be available.  */
 623 #define REG_ALLOC_ORDER \
 624  {9, 13, 12, 11, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 14, 15, 16, 17}
 625
 626
 627 /* Node: Values in Registers */
 628
 629 /* The VOIDmode test is so we can omit mode on anonymous insns.  FIXME:
 630    Still needed in 2.9x, at least for Axis-20000319.  */
 631 #define HARD_REGNO_NREGS(REGNO, MODE)   \
 632  (MODE == VOIDmode \
 633   ? 1 : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
 634
 635 /* CRIS permits all registers to hold all modes.  */
 636 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
 637
 638 #define MODES_TIEABLE_P(MODE1, MODE2)  1
 639
 640
 641 /* Node: Leaf Functions */
 642 /* (no definitions) */
 643
 644 /* Node: Stack Registers */
 645 /* (no definitions) */
 646
 647
 648 /* Node: Register Classes */
 649
 650 /* CRIS has only one kind of registers, so NO_REGS and ALL_REGS
 651    are the only classes.  FIXME: It actually makes sense to have another
 652    class for special registers, and yet another class for the
 653    multiply-overflow register in v10; then a class for the return
 654    register also makes sense.  */
 655 enum reg_class {NO_REGS, ALL_REGS, LIM_REG_CLASSES};
 656
 657 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 658
 659 #define REG_CLASS_NAMES {"NO_REGS", "ALL_REGS"}
 660
 661 #define GENERAL_REGS ALL_REGS
 662
 663 /* Count in the faked argument register in GENERAL_REGS.  Keep out SRP.  */
 664 #define REG_CLASS_CONTENTS {{0}, {0x2ffff}}
 665
 666 #define REGNO_REG_CLASS(REGNO) GENERAL_REGS
 667
 668 #define BASE_REG_CLASS GENERAL_REGS
 669
 670 #define INDEX_REG_CLASS GENERAL_REGS
 671
 672 /* Get reg_class from a letter such as appears in the machine
 673    description.  No letters are used, since 'r' is used for any
 674    register.  */
 675 #define REG_CLASS_FROM_LETTER(C) NO_REGS
 676
 677 /* Since it uses reg_renumber, it is safe only once reg_renumber
 678    has been allocated, which happens in local-alloc.c.  */
 679 #define REGNO_OK_FOR_BASE_P(REGNO)                                      \
 680  ((REGNO) <= CRIS_LAST_GENERAL_REGISTER                                 \
 681   || (REGNO) == ARG_POINTER_REGNUM                                      \
 682   || (unsigned) reg_renumber[REGNO] <= CRIS_LAST_GENERAL_REGISTER       \
 683   || (unsigned) reg_renumber[REGNO] == ARG_POINTER_REGNUM)
 684
 685 /* See REGNO_OK_FOR_BASE_P.  */
 686 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P(REGNO)
 687
 688 /* It seems like gcc (2.7.2 and 2.9x of 2000-03-22) may send "NO_REGS" as
 689    the class for a constant (testcase: __Mul in arit.c).  To avoid forcing
 690    out a constant into the constant pool, we will trap this case and
 691    return something a bit more sane.  FIXME: Check if this is a bug.  */
 692 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
 693  ((CLASS) == NO_REGS ? GENERAL_REGS : (CLASS))
 694
 695 /* For CRIS, this is always the size of MODE in words,
 696    since all registers are the same size.  To use omitted modes in
 697    patterns with reload constraints, you must say the widest size
 698    which is allowed for VOIDmode.
 699    FIXME:  Does that still apply for gcc-2.9x?  Keep poisoned until such
 700    patterns are added back.  News: 2001-03-16: Happens as early as the
 701    underscore-test.  */
 702 #define CLASS_MAX_NREGS(CLASS, MODE)                                    \
 703  ((MODE) == VOIDmode                                                    \
 704   ? 1 /* + cris_fatal ("CLASS_MAX_NREGS with VOIDmode") */              \
 705   : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
 706
 707 /* We are now out of letters; we could use ten more.  This forces us to
 708    use C-code in the 'md' file.  FIXME: Use some EXTRA_CONSTRAINTS.  */
 709 #define CONST_OK_FOR_LETTER_P(VALUE, C)                 \
 710  (                                                      \
 711   /* MOVEQ, CMPQ, ANDQ, ORQ.  */                        \
 712   (C) == 'I' ? (VALUE) >= -32 && (VALUE) <= 31 :        \
 713   /* ADDQ, SUBQ.  */                                    \
 714   (C) == 'J' ? (VALUE) >= 0 && (VALUE) <= 63 :          \
 715   /* ASRQ, BTSTQ, LSRQ, LSLQ.  */                       \
 716   (C) == 'K' ? (VALUE) >= 0 && (VALUE) <= 31 :          \
 717   /* A 16-bit signed number.  */                        \
 718   (C) == 'L' ? (VALUE) >= -32768 && (VALUE) <= 32767 :  \
 719   /* The constant 0 for CLEAR.  */                      \
 720   (C) == 'M' ? (VALUE) == 0 :                           \
 721   /* A negative ADDQ or SUBQ.  */                       \
 722   (C) == 'N' ? (VALUE) >= -63 && (VALUE) < 0 :          \
 723   /* Quickened ints, QI and HI.  */                     \
 724   (C) == 'O' ? (VALUE) >= 0 && (VALUE) <= 65535         \
 725                 && ((VALUE) >= (65535-31)               \
 726                     || ((VALUE) >= (255-31)             \
 727                         && (VALUE) <= 255 )) :          \
 728   /* A 16-bit number signed *or* unsigned.  */          \
 729   (C) == 'P' ? (VALUE) >= -32768 && (VALUE) <= 65535 :  \
 730   0)
 731
 732 /* It is really simple to make up a 0.0; it is the same as int-0 in
 733    IEEE754.  */
 734 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                  \
 735  ((C) == 'G' && ((VALUE) == CONST0_RTX (DFmode)                 \
 736                  || (VALUE) == CONST0_RTX (SFmode)))
 737
 738 /* We need this on cris to distinguish delay-slottable addressing modes.  */
 739 #define EXTRA_CONSTRAINT(X, C)                  \
 740  (                                              \
 741   /* Slottable address mode?  */                \
 742   (C) == 'Q' ? EXTRA_CONSTRAINT_Q (X) :         \
 743   /* Operand to BDAP or BIAP?  */               \
 744   (C) == 'R' ? EXTRA_CONSTRAINT_R (X) :         \
 745   /* A local PIC symbol?  */                    \
 746   (C) == 'S' ? EXTRA_CONSTRAINT_S (X) :         \
 747   /* A three-address addressing-mode?  */       \
 748   (C) == 'T' ? EXTRA_CONSTRAINT_T (X) :         \
 749   /* A global PIC symbol?  */                   \
 750   (C) == 'U' ? EXTRA_CONSTRAINT_U (X) :         \
 751   0)
 752
 753 #define EXTRA_CONSTRAINT_Q(X)                           \
 754  (                                                      \
 755   /* Slottable addressing modes:                        \
 756      A register?  FIXME: Unnecessary.  */               \
 757   (BASE_P (X) && REGNO (X) != CRIS_PC_REGNUM)           \
 758   /* Indirect register: [reg]?  */                      \
 759   || (GET_CODE (X) == MEM && BASE_P (XEXP (X, 0))       \
 760       && REGNO (XEXP (X, 0)) != CRIS_PC_REGNUM)         \
 761  )
 762
 763 #define EXTRA_CONSTRAINT_R(X)                                   \
 764  (                                                              \
 765   /* An operand to BDAP or BIAP:                                \
 766      A BIAP; r.S? */                                            \
 767   BIAP_INDEX_P (X)                                              \
 768   /* A [reg] or (int) [reg], maybe with post-increment.  */     \
 769   || BDAP_INDEX_P (X)                                           \
 770   || CONSTANT_INDEX_P (X)                                       \
 771  )
 772
 773 #define EXTRA_CONSTRAINT_T(X)                                           \
 774  (                                                                      \
 775   /* Memory three-address operand.  All are indirect-memory:  */        \
 776   GET_CODE (X) == MEM                                                   \
 777   && ((GET_CODE (XEXP (X, 0)) == MEM                                    \
 778        /* Double indirect: [[reg]] or [[reg+]]?  */                     \
 779        && (BASE_OR_AUTOINCR_P (XEXP (XEXP (X, 0), 0))))                 \
 780       /* Just an explicit indirect reference: [const]?  */              \
 781       || CONSTANT_P (XEXP (X, 0))                                       \
 782       /* Something that is indexed; [...+...]?  */                      \
 783       || (GET_CODE (XEXP (X, 0)) == PLUS                                \
 784           /* A BDAP constant: [reg+(8|16|32)bit offset]?  */            \
 785           && ((BASE_P (XEXP (XEXP (X, 0), 0))                           \
 786                && CONSTANT_INDEX_P (XEXP (XEXP (X, 0), 1)))             \
 787               /* Swap arguments to the above.  FIXME: gcc-2.9x? */      \
 788               || (BASE_P (XEXP (XEXP (X, 0), 1))                        \
 789                   && CONSTANT_INDEX_P (XEXP (XEXP (X, 0), 0)))          \
 790               /* A BDAP register: [reg+[reg(+)].S]?  */                 \
 791               || (BASE_P (XEXP (XEXP (X, 0), 0))                        \
 792                   && BDAP_INDEX_P(XEXP(XEXP(X, 0), 1)))                 \
 793               /* Same, but with swapped arguments.  */                  \
 794               || (BASE_P (XEXP (XEXP (X, 0), 1))                        \
 795                   && BDAP_INDEX_P (XEXP (XEXP (X, 0), 0)))              \
 796               /* A BIAP: [reg+reg.S].  */                               \
 797               || (BASE_P (XEXP (XEXP (X, 0), 0))                        \
 798                   && BIAP_INDEX_P (XEXP (XEXP (X, 0), 1)))              \
 799               /* Same, but with swapped arguments.  */                  \
 800               || (BASE_P (XEXP (XEXP (X, 0), 1))                        \
 801                   && BIAP_INDEX_P (XEXP (XEXP (X, 0), 0))))))           \
 802  )
 803
 804 #define EXTRA_CONSTRAINT_S(X) \
 805  (flag_pic && CONSTANT_P (X) && cris_gotless_symbol (X))
 806
 807 #define EXTRA_CONSTRAINT_U(X) \
 808  (flag_pic && CONSTANT_P (X) && cris_got_symbol (X))
 809
 810
 811 /* Node: Frame Layout */
 812
 813 #define STACK_GROWS_DOWNWARD
 814 #define FRAME_GROWS_DOWNWARD
 815
 816 /* It seems to be indicated in the code (at least 2.1) that this is
 817    better a constant, and best 0.  */
 818 #define STARTING_FRAME_OFFSET 0
 819
 820 #define FIRST_PARM_OFFSET(FNDECL) 0
 821
 822 #define RETURN_ADDR_RTX(COUNT, FRAMEADDR) \
 823  cris_return_addr_rtx (COUNT, FRAMEADDR)
 824
 825 #define INCOMING_RETURN_ADDR_RTX gen_rtx (REG, Pmode, CRIS_SRP_REGNUM)
 826
 827 /* FIXME: Any __builtin_eh_return callers must not return anything and
 828    there must not be collisions with incoming parameters.  Luckily the
 829    number of __builtin_eh_return callers is limited.  For now return
 830    parameter registers in reverse order and hope for the best.  */
 831 #define EH_RETURN_DATA_REGNO(N) \
 832   (IN_RANGE ((N), 0, 3) ? (CRIS_FIRST_ARG_REG + 3 - (N)) : INVALID_REGNUM)
 833
 834 /* Store the stack adjustment in the structure-return-address register.  */
 835 #define CRIS_STACKADJ_REG STRUCT_VALUE_REGNUM
 836 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (SImode, CRIS_STACKADJ_REG)
 837
 838 #define EH_RETURN_HANDLER_RTX \
 839   cris_return_addr_rtx (0, NULL)
 840
 841 #define INIT_EXPANDERS cris_init_expanders ()
 842
 843 /* FIXME: Move this to right node (it's not documented properly yet).  */
 844 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (CRIS_SRP_REGNUM)
 845
 846 /* FIXME: Move this to right node (it's not documented properly yet).
 847    FIXME: Check what alignment we can assume regarding
 848    TARGET_STACK_ALIGN and TARGET_ALIGN_BY_32.  */
 849 #define DWARF_CIE_DATA_ALIGNMENT -1
 850
 851 /* If we would ever need an exact mapping between canonical register
 852    number and dwarf frame register, we would either need to include all
 853    registers in the gcc description (with some marked fixed of course), or
 854    an inverse mapping from dwarf register to gcc register.  There is one
 855    need in dwarf2out.c:expand_builtin_init_dwarf_reg_sizes.  Right now, I
 856    don't see that we need exact correspondence between DWARF *frame*
 857    registers and DBX_REGISTER_NUMBER, so map them onto GCC registers.  */
 858 #define DWARF_FRAME_REGNUM(REG) (REG)
 859
 860 /* Node: Stack Checking */
 861 /* (no definitions) FIXME: Check.  */
 862
 863 /* Node: Frame Registers */
 864
 865 #define STACK_POINTER_REGNUM 14
 866
 867 /* Register used for frame pointer.  This is also the last of the saved
 868    registers, when a frame pointer is not used.  */
 869 #define FRAME_POINTER_REGNUM 8
 870
 871 /* Faked register, is always eliminated.  We need it to eliminate
 872    allocating stack slots for the return address and the frame pointer.  */
 873 #define ARG_POINTER_REGNUM 17
 874
 875 #define STATIC_CHAIN_REGNUM 7
 876
 877
 878 /* Node: Elimination */
 879
 880 /* Really only needed if the stack frame has variable length (alloca
 881    or variable sized local arguments (GNU C extension).  */
 882 #define FRAME_POINTER_REQUIRED 0
 883
 884 #define ELIMINABLE_REGS                         \
 885  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 886   {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
 887   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
 888
 889 /* We need not worry about when the frame-pointer is required for other
 890    reasons.  */
 891 #define CAN_ELIMINATE(FROM, TO) 1
 892
 893 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 894  (OFFSET) = cris_initial_elimination_offset (FROM, TO)
 895
 896
 897 /* Node: Stack Arguments */
 898
 899 /* Since many parameters take up one register each in any case,
 900    PROMOTE_PROTOTYPES would seem like a good idea, but measurements
 901    indicate that a combination using PROMOTE_MODE is better.  */
 902
 903 #define ACCUMULATE_OUTGOING_ARGS 1
 904
 905 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
 906
 907
 908 /* Node: Register Arguments */
 909
 910 /* The void_type_node is sent as a "closing" call.  We have to stop it
 911    since it's invalid to FUNCTION_ARG_PASS_BY_REFERENCE (or was invalid at
 912    some time).  */
 913 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)                    \
 914  ((CUM).regs < CRIS_MAX_ARGS_IN_REGS                            \
 915   && (TYPE) != void_type_node                                   \
 916   && ! FUNCTION_ARG_PASS_BY_REFERENCE (CUM, MODE, TYPE, NAMED)  \
 917   ? gen_rtx (REG, MODE, (CRIS_FIRST_ARG_REG) + (CUM).regs)      \
 918   : NULL_RTX)
 919
 920 /* The differences between this and the previous, is that this one checks
 921    that an argument is named, since incoming stdarg/varargs arguments are
 922    pushed onto the stack, and we don't have to check against the "closing"
 923    void_type_node TYPE parameter.  */
 924 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED)                   \
 925  (((NAMED) && (CUM).regs < CRIS_MAX_ARGS_IN_REGS                        \
 926    && ! FUNCTION_ARG_PASS_BY_REFERENCE (CUM, MODE, TYPE, NAMED))        \
 927   ? gen_rtx (REG, MODE, CRIS_FIRST_ARG_REG + (CUM).regs)                \
 928   : NULL_RTX)
 929
 930 #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED)      \
 931  (((CUM).regs == (CRIS_MAX_ARGS_IN_REGS - 1)                    \
 932    && !MUST_PASS_IN_STACK (MODE, TYPE)                          \
 933    && CRIS_FUNCTION_ARG_SIZE (MODE, TYPE) > 4                   \
 934    && CRIS_FUNCTION_ARG_SIZE (MODE, TYPE) <= 8)                 \
 935   ? 1 : 0)
 936
 937 /* Structs may be passed by value, but they must not be more than 8
 938    bytes long.  If you tweak this, don't forget to adjust
 939    cris_expand_builtin_va_arg.  */
 940 #define FUNCTION_ARG_PASS_BY_REFERENCE(CUM, MODE, TYPE, NAMED)          \
 941  (MUST_PASS_IN_STACK (MODE, TYPE)                                       \
 942   || CRIS_FUNCTION_ARG_SIZE (MODE, TYPE) > 8)                           \
 943
 944 /* Contrary to what you'd believe, defining FUNCTION_ARG_CALLEE_COPIES
 945    seems like a (small total) loss, at least for gcc-2.7.2 compiling and
 946    running gcc-2.1 (small win in size, small loss running -- 100.1%),
 947    and similarly for size for products (.1 .. .3% bloat, sometimes win).
 948    Due to the empirical likeliness of making slower code, it is not
 949    defined.  */
 950
 951 /* This no longer *needs* to be a structure; but keeping it as such should
 952    not hurt (and hacking the ABI is simpler).  */
 953 #define CUMULATIVE_ARGS struct cum_args
 954 struct cum_args {int regs;};
 955
 956 /* The regs member is an integer, the number of arguments got into
 957    registers so far.  */
 958 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL)        \
 959  ((CUM).regs = 0)
 960
 961 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)            \
 962  ((CUM).regs                                                    \
 963   = (FUNCTION_ARG_PASS_BY_REFERENCE(CUM, MODE, TYPE, NAMED)     \
 964      ? (CRIS_MAX_ARGS_IN_REGS) + 1                              \
 965      : ((CUM).regs                                              \
 966         + (3 + (CRIS_FUNCTION_ARG_SIZE (MODE, TYPE))) / 4)))
 967
 968 #define FUNCTION_ARG_REGNO_P(REGNO)                     \
 969  ((REGNO) >= CRIS_FIRST_ARG_REG                         \
 970   && (REGNO) < CRIS_FIRST_ARG_REG + (CRIS_MAX_ARGS_IN_REGS))
 971
 972
 973 /* Node: Scalar Return */
 974
 975 /* Let's assume all functions return in r[CRIS_FIRST_ARG_REG] for the
 976    time being.  */
 977 #define FUNCTION_VALUE(VALTYPE, FUNC)  \
 978  gen_rtx (REG, TYPE_MODE (VALTYPE), CRIS_FIRST_ARG_REG)
 979
 980 #define LIBCALL_VALUE(MODE) gen_rtx (REG, MODE, CRIS_FIRST_ARG_REG)
 981
 982 #define FUNCTION_VALUE_REGNO_P(N) ((N) == CRIS_FIRST_ARG_REG)
 983
 984
 985 /* Node: Aggregate Return */
 986
 987 #if 0
 988 /* FIXME: Let's try this some time, so we return structures in registers.
 989    We would cast the result of int_size_in_bytes to unsigned, so we will
 990    get a huge number for "structures" of variable size (-1).  */
 991 #define RETURN_IN_MEMORY(TYPE) \
 992  ((unsigned) int_size_in_bytes (TYPE) > CRIS_MAX_ARGS_IN_REGS * UNITS_PER_WORD)
 993 #endif
 994
 995 #define STRUCT_VALUE_REGNUM ((CRIS_FIRST_ARG_REG) - 1)
 996
 997
 998 /* Node: Caller Saves */
 999 /* (no definitions) */
1000
1001 /* Node: Function entry */
1002
1003 /* See cris.c for TARGET_ASM_FUNCTION_PROLOGUE and
1004    TARGET_ASM_FUNCTION_EPILOGUE.  */
1005
1006 /* If the epilogue uses the "ret" insn, we need to fill the
1007    delay slot.  */
1008 #define DELAY_SLOTS_FOR_EPILOGUE cris_delay_slots_for_epilogue ()
1009
1010 #define ELIGIBLE_FOR_EPILOGUE_DELAY(INSN, N) \
1011   cris_eligible_for_epilogue_delay (INSN)
1012
1013 /* Node: Profiling */
1014
1015 #define FUNCTION_PROFILER(FILE, LABELNO)  \
1016  error ("no FUNCTION_PROFILER for CRIS")
1017
1018 /* FIXME: Some of the undefined macros might be mandatory.  If so, fix
1019    documentation.  */
1020
1021
1022 /* Node: Varargs */
1023
1024 /* We save the register number of the first anonymous argument in
1025    first_vararg_reg, and take care of this in the function prologue.
1026    This behavior is used by at least one more port (the ARM?), but
1027    may be unsafe when compiling nested functions.  (With varargs? Hairy.)
1028    Note that nested-functions is a GNU C extension.
1029
1030    FIXME: We can actually put the size in PRETEND and deduce the number
1031    of registers from it in the prologue and epilogue.  */
1032 #define SETUP_INCOMING_VARARGS(ARGSSF, MODE, TYPE, PRETEND, SECOND)     \
1033   do                                                                    \
1034     {                                                                   \
1035       if ((ARGSSF).regs < (CRIS_MAX_ARGS_IN_REGS))                      \
1036         (PRETEND) = ((CRIS_MAX_ARGS_IN_REGS) - (ARGSSF).regs) * 4;      \
1037       if (TARGET_PDEBUG)                                                \
1038         {                                                               \
1039           fprintf (asm_out_file,                                        \
1040                    "\n; VA:: ANSI: %d args before, anon @ #%d, %dtime\n", \
1041                    (ARGSSF).regs, PRETEND, SECOND);                     \
1042         }                                                               \
1043     }                                                                   \
1044   while (0)
1045
1046 /* FIXME: This and other EXPAND_BUILTIN_VA_... target macros are not
1047    documented, although used by several targets.  */
1048 #define EXPAND_BUILTIN_VA_ARG(VALIST, TYPE) \
1049  cris_expand_builtin_va_arg (VALIST, TYPE)
1050
1051
1052 /* Node: Trampolines */
1053
1054 /* This looks too complicated, and it is.  I assigned r7 to be the
1055    static chain register, but it is call-saved, so we have to save it,
1056    and come back to restore it after the call, so we have to save srp...
1057    Anyway, trampolines are rare enough that we can cope with this
1058    somewhat lack of elegance.
1059     (Do not be tempted to "straighten up" whitespace in the asms; the
1060    assembler #NO_APP state mandates strict spacing).  */
1061 #define TRAMPOLINE_TEMPLATE(FILE)               \
1062   do                                            \
1063     {                                           \
1064       fprintf (FILE, "\tmove.d $%s,[$pc+20]\n", \
1065                reg_names[STATIC_CHAIN_REGNUM]); \
1066       fprintf (FILE, "\tmove $srp,[$pc+22]\n"); \
1067       fprintf (FILE, "\tmove.d 0,$%s\n",        \
1068                reg_names[STATIC_CHAIN_REGNUM]); \
1069       fprintf (FILE, "\tjsr 0\n");              \
1070       fprintf (FILE, "\tmove.d 0,$%s\n",        \
1071                reg_names[STATIC_CHAIN_REGNUM]); \
1072       fprintf (FILE, "\tjump 0\n");             \
1073     }                                           \
1074   while (0)
1075
1076 #define TRAMPOLINE_SIZE 32
1077
1078 /* CRIS wants instructions on word-boundary.
1079    Note that due to a bug (reported) in 2.7.2 and earlier, this is
1080    actually treated as alignment in _bytes_, not _bits_.  (Obviously
1081    this is not fatal, only a slight waste of stack space).  */
1082 #define TRAMPOLINE_ALIGNMENT 16
1083
1084 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)               \
1085   do                                                            \
1086     {                                                           \
1087       emit_move_insn (gen_rtx (MEM, SImode,                     \
1088                                plus_constant (TRAMP, 10)),      \
1089                       CXT);                                     \
1090       emit_move_insn (gen_rtx (MEM, SImode,                     \
1091                                plus_constant (TRAMP, 16)),      \
1092                       FNADDR);                                  \
1093     }                                                           \
1094   while (0)
1095
1096 /* Note that there is no need to do anything with the cache for sake of
1097    a trampoline.  */
1098
1099
1100 /* Node: Library Calls */
1101
1102 /* If you change this, you have to check whatever libraries and systems
1103    that use it.  */
1104 #define TARGET_EDOM 33
1105
1106
1107 /* Node: Addressing Modes */
1108
1109 #define HAVE_POST_INCREMENT 1
1110
1111 #define CONSTANT_ADDRESS_P(X) CONSTANT_P (X)
1112
1113 #define MAX_REGS_PER_ADDRESS 2
1114
1115 /* There are helper macros defined here which are used only in
1116    GO_IF_LEGITIMATE_ADDRESS.
1117
1118    Note that you *have to* reject invalid addressing modes for mode
1119    MODE, even if it is legal for normal addressing modes.  You cannot
1120    rely on the constraints to do this work.  They can only be used to
1121    doublecheck your intentions.  One example is that you HAVE TO reject
1122    (mem:DI (plus:SI (reg:SI x) (reg:SI y))) because for some reason
1123    this cannot be reloaded.  (Which of course you can argue that gcc
1124    should have done.)  FIXME:  Strange.  Check.  */
1125
1126 /* No symbol can be used as an index (or more correct, as a base) together
1127    with a register with PIC; the PIC register must be there.  */
1128 #define CONSTANT_INDEX_P(X) \
1129  (CONSTANT_P (X) && !(flag_pic && cris_symbol (X)))
1130
1131 /* True if X is a valid base register.  */
1132 #define BASE_P(X) \
1133  (REG_P (X) && REG_OK_FOR_BASE_P (X))
1134
1135 /* True if X is a valid base register with or without autoincrement.  */
1136 #define BASE_OR_AUTOINCR_P(X) \
1137  (BASE_P (X) || (GET_CODE (X) == POST_INC && BASE_P (XEXP (X, 0))))
1138
1139 /* True if X is a valid (register) index for BDAP, i.e. [Rs].S or [Rs+].S.  */
1140 #define BDAP_INDEX_P(X)                                 \
1141  ((GET_CODE (X) == MEM && GET_MODE (X) == SImode        \
1142    && BASE_OR_AUTOINCR_P (XEXP (X, 0)))                 \
1143   || (GET_CODE (X) == SIGN_EXTEND                       \
1144       && GET_CODE (XEXP (X, 0)) == MEM                  \
1145       && (GET_MODE (XEXP (X, 0)) == HImode              \
1146           || GET_MODE (XEXP (X, 0)) == QImode)          \
1147       && BASE_OR_AUTOINCR_P (XEXP (XEXP (X, 0), 0))))
1148
1149 /* True if X is a valid (register) index for BIAP, i.e. Rd.m.  */
1150 #define BIAP_INDEX_P(X)                         \
1151  ((BASE_P (X) && REG_OK_FOR_INDEX_P (X))        \
1152   || (GET_CODE (X) == MULT                      \
1153       && BASE_P (XEXP (X, 0))                   \
1154       && REG_OK_FOR_INDEX_P (XEXP (X, 0))       \
1155       && GET_CODE (XEXP (X, 1)) == CONST_INT    \
1156       && (INTVAL (XEXP (X, 1)) == 2             \
1157           || INTVAL (XEXP (X, 1)) == 4)))
1158
1159 /* True if X is an address that doesn't need a prefix i.e. [Rs] or [Rs+].  */
1160 #define SIMPLE_ADDRESS_P(X) \
1161  (BASE_P (X)                                            \
1162   || (GET_CODE (X) == POST_INC                          \
1163       && BASE_P (XEXP (X, 0))))
1164
1165 /* A PIC operand looks like a normal symbol here.  At output we dress it
1166    in "[rPIC+symbol:GOT]" (global symbol) or "rPIC+symbol:GOTOFF" (local
1167    symbol) so we exclude all addressing modes where we can't replace a
1168    plain "symbol" with that.  A global PIC symbol does not fit anywhere
1169    here (but is thankfully a general_operand in itself).  A local PIC
1170    symbol is valid for the plain "symbol + offset" case.  */
1171 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR)                 \
1172  {                                                              \
1173    rtx x1, x2;                                                  \
1174    if (SIMPLE_ADDRESS_P (X))                                    \
1175      goto ADDR;                                                 \
1176    if (CONSTANT_P (X)                                           \
1177        && (! flag_pic                                           \
1178            || cris_gotless_symbol (X)                           \
1179            || ! cris_symbol (X)))                               \
1180      goto ADDR;                                                 \
1181    /* Indexed?  */                                              \
1182    if (GET_CODE (X) == PLUS)                                    \
1183      {                                                          \
1184        x1 = XEXP (X, 0);                                        \
1185        x2 = XEXP (X, 1);                                        \
1186        /* BDAP o, Rd.  */                                       \
1187        if ((BASE_P (x1) && CONSTANT_INDEX_P (x2))               \
1188            || (BASE_P (x2) && CONSTANT_INDEX_P (x1))            \
1189             /* BDAP Rs[+], Rd.  */                              \
1190            || (GET_MODE_SIZE (MODE) <= UNITS_PER_WORD           \
1191                && ((BASE_P (x1) && BDAP_INDEX_P (x2))           \
1192                    || (BASE_P (x2) && BDAP_INDEX_P (x1))        \
1193                    /* BIAP.m Rs, Rd */                          \
1194                    || (BASE_P (x1) && BIAP_INDEX_P (x2))        \
1195                    || (BASE_P (x2) && BIAP_INDEX_P (x1)))))     \
1196          goto ADDR;                                             \
1197      }                                                          \
1198    else if (GET_CODE (X) == MEM)                                \
1199      {                                                          \
1200        /* DIP (Rs).  Reject [[reg+]] and [[reg]] for            \
1201           DImode (long long).  */                               \
1202        if (GET_MODE_SIZE (MODE) <= UNITS_PER_WORD               \
1203            && (BASE_P (XEXP (X, 0))                             \
1204                || BASE_OR_AUTOINCR_P (XEXP (X, 0))))            \
1205          goto ADDR;                                             \
1206      }                                                          \
1207  }
1208
1209 #ifndef REG_OK_STRICT
1210  /* Nonzero if X is a hard reg that can be used as a base reg
1211     or if it is a pseudo reg.  */
1212 # define REG_OK_FOR_BASE_P(X)                   \
1213  (REGNO (X) <= CRIS_LAST_GENERAL_REGISTER       \
1214   || REGNO (X) == ARG_POINTER_REGNUM            \
1215   || REGNO (X) >= FIRST_PSEUDO_REGISTER)
1216 #else
1217  /* Nonzero if X is a hard reg that can be used as a base reg.  */
1218 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
1219 #endif
1220
1221 #ifndef REG_OK_STRICT
1222  /* Nonzero if X is a hard reg that can be used as an index
1223     or if it is a pseudo reg.  */
1224 # define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
1225 #else
1226  /* Nonzero if X is a hard reg that can be used as an index.  */
1227 # define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
1228 #endif
1229
1230 /* For now, don't do anything.  GCC does a good job most often.
1231
1232     Maybe we could do something about gcc:s misbehavior when it
1233    recalculates frame offsets for local variables, from fp+offs to
1234    sp+offs.  The resulting address expression gets screwed up
1235    sometimes, but I'm not sure that it may be fixed here, since it is
1236    already split up in several instructions (Is this still true?).
1237    FIXME: Check and adjust for gcc-2.9x.  */
1238 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN) {}
1239
1240 /* Kludge to solve Axis-990219: Work around imperfection in
1241    reload_load_address1:
1242     (plus (sign_extend (mem:qi (reg))) (reg))
1243    should be reloaded as (plus (reg) (reg)), not
1244     (plus (sign_extend (reg)) (reg)).
1245    There are no checks that reload_load_address_1 "reloads"
1246    addresses correctly, so invalidness is not caught or
1247    corrected.
1248     When the right thing happens in reload, the kludge can
1249    be removed; still not as of 2003-02-27.  */
1250
1251 #define LEGITIMIZE_RELOAD_ADDRESS(X, MODE, OPNUM, TYPE, IND_LEVELS, WIN) \
1252   do                                                                    \
1253     {                                                                   \
1254       if (GET_CODE (X) == PLUS                                          \
1255           && REG_P (XEXP (X, 1))                                        \
1256           && GET_CODE (XEXP (X, 0)) == SIGN_EXTEND                      \
1257           && GET_CODE (XEXP (XEXP (X, 0), 0)) == MEM                    \
1258           && (GET_MODE (XEXP (XEXP (X, 0), 0)) == HImode                \
1259               || GET_MODE (XEXP (XEXP (X, 0), 0)) == QImode)            \
1260           && (REG_P (XEXP (XEXP (XEXP (X, 0), 0), 0))                   \
1261               || (GET_CODE (XEXP (XEXP (XEXP (X, 0), 0), 0))            \
1262                   == POST_INC                                           \
1263                   && REG_P (XEXP (XEXP (XEXP (XEXP (X, 0), 0), 0),      \
1264                                   0)))))                                \
1265         {                                                               \
1266           int something_reloaded = 0;                                   \
1267                                                                         \
1268           if (REGNO (XEXP (X, 1)) >= FIRST_PSEUDO_REGISTER)             \
1269             {                                                           \
1270               /* Second reg is pseudo, reload it.  */                   \
1271               push_reload (XEXP (X, 1), NULL_RTX, &XEXP (X, 1),         \
1272                            NULL,                                        \
1273                            GENERAL_REGS, GET_MODE (X), VOIDmode, 0, 0,  \
1274                            OPNUM, TYPE);                                \
1275               something_reloaded = 1;                                   \
1276             }                                                           \
1277                                                                         \
1278           if (REG_P (XEXP (XEXP (XEXP (X, 0), 0), 0))                   \
1279               && (REGNO (XEXP (XEXP (XEXP (X, 0), 0), 0))               \
1280                   >= FIRST_PSEUDO_REGISTER))                            \
1281             {                                                           \
1282               /* First one is a pseudo - reload that.  */               \
1283               push_reload (XEXP (XEXP (XEXP (X, 0), 0), 0), NULL_RTX,   \
1284                            &XEXP (XEXP (XEXP (X, 0), 0), 0), NULL,      \
1285                            GENERAL_REGS,                                \
1286                            GET_MODE (X), VOIDmode, 0, 0, OPNUM, TYPE);  \
1287               something_reloaded = 1;                                   \
1288             }                                                           \
1289                                                                         \
1290           if (! something_reloaded                                      \
1291               || (GET_CODE (XEXP (XEXP (X, 0), 0)) == POST_INC          \
1292                   && (REGNO (XEXP (XEXP (XEXP (X, 0), 0), 0))           \
1293                       >= FIRST_PSEUDO_REGISTER)))                       \
1294             /* Reload the sign_extend.  Happens if neither reg is a     \
1295                pseudo, or the first one was inside post_increment.  */  \
1296             push_reload (XEXP (X, 0), NULL_RTX, &XEXP (X, 0), NULL,     \
1297                          GENERAL_REGS, GET_MODE (X), VOIDmode, 0, 0,    \
1298                          OPNUM, TYPE);                                  \
1299           goto WIN;                                                     \
1300         }                                                               \
1301     }                                                                   \
1302   while (0)
1303
1304 /* In CRIS, only the postincrement address mode depends thus,
1305    since the increment depends on the size of the operand.  */
1306 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)       \
1307   do                                                    \
1308     {                                                   \
1309       if (GET_CODE (ADDR) == POST_INC)                  \
1310         goto LABEL;                                     \
1311     }                                                   \
1312   while (0)
1313
1314 #define LEGITIMATE_CONSTANT_P(X) 1
1315
1316
1317 /* Node: Condition Code */
1318
1319 #define NOTICE_UPDATE_CC(EXP, INSN) cris_notice_update_cc (EXP, INSN)
1320
1321 /* FIXME: Maybe define CANONICALIZE_COMPARISON later, when playing with
1322    optimizations.  It is needed; currently we do this with instruction
1323    patterns and NOTICE_UPDATE_CC.  */
1324
1325
1326 /* Node: Costs */
1327
1328 /* FIXME: Need to define REGISTER_MOVE_COST when more register classes are
1329    introduced.  */
1330
1331 /* This isn't strictly correct for v0..3 in buswidth-8bit mode, but
1332    should suffice.  */
1333 #define MEMORY_MOVE_COST(M, CLASS, IN) \
1334  (((M) == QImode) ? 4 : ((M) == HImode) ? 4 : 6)
1335
1336 /* Regardless of the presence of delay slots, the default value of 1 for
1337    BRANCH_COST is the best in the range (1, 2, 3), tested with gcc-2.7.2
1338    with testcases ipps and gcc, giving smallest and fastest code.  */
1339
1340 #define SLOW_BYTE_ACCESS 0
1341
1342 /* This is the threshold *below* which inline move sequences of
1343    word-length sizes will be emitted.  The "9" will translate to
1344    (9 - 1) * 4 = 32 bytes maximum moved, but using 16 instructions
1345    (8 instruction sequences) or less.  */
1346 #define MOVE_RATIO 9
1347
1348
1349 /* Node: Sections */
1350
1351 #define TEXT_SECTION_ASM_OP "\t.text"
1352
1353 #define DATA_SECTION_ASM_OP "\t.data"
1354
1355 #define FORCE_EH_FRAME_INFO_IN_DATA_SECTION (! TARGET_ELF)
1356
1357 /* The jump table is immediately connected to the preceding insn.  */
1358 #define JUMP_TABLES_IN_TEXT_SECTION 1
1359
1360 /* We pull a little trick to register the _fini function with atexit,
1361    after (presumably) registering the eh frame info, since we don't handle
1362    _fini (a.k.a. ___fini_start) in crt0 or have a crti for "pure" ELF.  If
1363    you change this, don't forget that you can't have library function
1364    references (e.g. to atexit) in crtend.o, since those won't be resolved
1365    to libraries; those are linked in *before* crtend.o.  */
1366 #ifdef CRT_BEGIN
1367 # define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)             \
1368 static void __attribute__((__used__))                           \
1369 call_ ## FUNC (void)                                            \
1370 {                                                               \
1371   asm (SECTION_OP);                                             \
1372   FUNC ();                                                      \
1373   if (__builtin_strcmp (#FUNC, "frame_dummy") == 0)             \
1374    {                                                            \
1375      extern void __fini__start (void);                          \
1376      atexit (__fini__start);                                    \
1377    }                                                            \
1378   asm (TEXT_SECTION_ASM_OP);                                    \
1379 }
1380 #endif
1381
1382 /* Node: PIC */
1383
1384 #define PIC_OFFSET_TABLE_REGNUM (flag_pic ? 0 : INVALID_REGNUM)
1385
1386 #define LEGITIMATE_PIC_OPERAND_P(X) cris_legitimate_pic_operand (X)
1387
1388
1389 /* Node: File Framework */
1390
1391 /* We don't want an .ident for gcc.  To avoid that but still support
1392    #ident, we override ASM_OUTPUT_IDENT and, since the gcc .ident is its
1393    only use besides ASM_OUTPUT_IDENT, undef IDENT_ASM_OP from elfos.h.  */
1394 #undef IDENT_ASM_OP
1395 #undef ASM_OUTPUT_IDENT
1396 #define ASM_OUTPUT_IDENT(FILE, NAME) \
1397   fprintf (FILE, "%s\"%s\"\n", "\t.ident\t", NAME);
1398
1399 #define ASM_APP_ON "#APP\n"
1400
1401 #define ASM_APP_OFF "#NO_APP\n"
1402
1403
1404 /* Node: Data Output */
1405
1406 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C) (C) == '@'
1407
1408 /* Node: Uninitialized Data */
1409
1410 /* Remember to round off odd values if we want data alignment,
1411    since we cannot do that with an .align directive.
1412
1413    Using .comm causes the space not to be reserved in .bss, but by
1414    tricks with the symbol type.  Not good if other tools than binutils
1415    are used on the object files.  Since ".global ... .lcomm ..." works, we
1416    use that.  Use .._ALIGNED_COMMON, since gcc whines when we only have
1417    ..._COMMON, and we prefer to whine ourselves; BIGGEST_ALIGNMENT is not
1418    the one to check.  This done for a.out only.  */
1419 /* FIXME: I suspect a bug in gcc with alignment.  Do not warn until
1420    investigated; it mucks up the testsuite results.  */
1421 #define CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, LOCAL) \
1422   do                                                                    \
1423     {                                                                   \
1424       int align_ = (ALIGN) / BITS_PER_UNIT;                             \
1425       if (TARGET_DATA_ALIGN && TARGET_ALIGN_BY_32 && align_ < 4)        \
1426         align_ = 4;                                                     \
1427       else if (TARGET_DATA_ALIGN && align_ < 2)                         \
1428         align_ = 2;                                                     \
1429       /* FIXME: Do we need this?  */                                    \
1430       else if (align_ < 1)                                              \
1431         align_ = 1;                                                     \
1432                                                                         \
1433       if (TARGET_ELF)                                                   \
1434         {                                                               \
1435           if (LOCAL)                                                    \
1436             {                                                           \
1437               fprintf ((FILE), "%s", LOCAL_ASM_OP);                     \
1438               assemble_name ((FILE), (NAME));                           \
1439               fprintf ((FILE), "\n");                                   \
1440             }                                                           \
1441           fprintf ((FILE), "%s", COMMON_ASM_OP);                        \
1442           assemble_name ((FILE), (NAME));                               \
1443           fprintf ((FILE), ",%u,%u\n", (int)(SIZE), align_);            \
1444         }                                                               \
1445       else                                                              \
1446         {                                                               \
1447           /* We can't tell a one-only or weak COMM from a "global       \
1448              COMM" so just make all non-locals weak.  */                \
1449           if (! (LOCAL))                                                \
1450             ASM_WEAKEN_LABEL (FILE, NAME);                              \
1451           fputs ("\t.lcomm ", (FILE));                                  \
1452           assemble_name ((FILE), (NAME));                               \
1453           fprintf ((FILE), ",%u\n",                                     \
1454                    ((int)(SIZE) + (align_ - 1)) & ~(align_ - 1));       \
1455         }                                                               \
1456     }                                                                   \
1457   while (0)
1458
1459 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
1460  CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 0)
1461
1462 #undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
1463 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
1464  CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 1)
1465
1466 /* FIXME: define ASM_OUTPUT_SHARED_COMMON and emit an error when it is
1467    used with -melinux and a.out.  */
1468
1469 /* Node: Label Output */
1470
1471 /* Globalizing directive for a label.  */
1472 #define GLOBAL_ASM_OP "\t.global "
1473
1474 #define SUPPORTS_WEAK 1
1475
1476 /* Remove any previous definition (elfos.h).  */
1477 #undef ASM_GENERATE_INTERNAL_LABEL
1478 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
1479   sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long) NUM)
1480
1481 /* Node: Initialization */
1482 /* (no definitions) */
1483
1484 /* Node: Macros for Initialization */
1485 /* (no definitions) */
1486
1487 /* Node: Instruction Output */
1488
1489 #define REGISTER_NAMES                                  \
1490  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", \
1491   "r9", "r10", "r11", "r12", "r13", "sp", "pc", "srp", "faked_ap"}
1492
1493 #define ADDITIONAL_REGISTER_NAMES \
1494  {{"r14", 14}, {"r15", 15}}
1495
1496 #define PRINT_OPERAND(FILE, X, CODE)            \
1497  cris_print_operand (FILE, X, CODE)
1498
1499 /* For delay-slot handling.  */
1500 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) (CODE == '#')
1501
1502 #define PRINT_OPERAND_ADDRESS(FILE, ADDR)       \
1503    cris_print_operand_address (FILE, ADDR)
1504
1505 /* Output an empty line to illustrate the presence of the delay slot.  */
1506 #define DBR_OUTPUT_SEQEND(FILE) \
1507   fprintf (FILE, "\n")
1508
1509 #define LOCAL_LABEL_PREFIX (TARGET_ELF ? "." : "")
1510
1511 /* cppinit.c initializes a const array from this, so it must be constant,
1512    can't have it different based on options.  Luckily, the prefix is
1513    always allowed, so let's have it on all GCC-generated code.  Note that
1514    we have this verbatim everywhere in the back-end, not using %R or %s or
1515    such.  */
1516 #define REGISTER_PREFIX "$"
1517
1518 /* Remove any previous definition (elfos.h).  */
1519 /* We use -fno-leading-underscore to remove it, when necessary.  */
1520 #undef USER_LABEL_PREFIX
1521 #define USER_LABEL_PREFIX "_"
1522
1523 #define ASM_OUTPUT_REG_PUSH(FILE, REGNO) \
1524   fprintf (FILE, "\tpush $%s\n", reg_names[REGNO])
1525
1526 #define ASM_OUTPUT_REG_POP(FILE, REGNO) \
1527   fprintf (FILE, "\tpop $%s\n", reg_names[REGNO])
1528
1529
1530 /* Node: Dispatch Tables */
1531
1532 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL)        \
1533   asm_fprintf (FILE, "\t.word %LL%d-%LL%d\n", VALUE, REL)
1534
1535 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
1536   asm_fprintf (FILE, "\t.dword %LL%d\n", VALUE)
1537
1538 /* Defined to also emit an .align in elfos.h.  We don't want that.  */
1539 #undef ASM_OUTPUT_CASE_LABEL
1540
1541 /* Since the "bound" insn loads the comparison value if the compared<
1542    value (register) is out of bounds (0..comparison value-1), we need
1543    to output another case to catch it.
1544    The way to find it is to look for the label_ref at the else-arm inside
1545    the expanded casesi core-insn.
1546    FIXME: Check this construct when changing to new version of gcc.  */
1547 #define ASM_OUTPUT_CASE_END(STREAM, NUM, TABLE)                         \
1548   do                                                                    \
1549     {                                                                   \
1550       asm_fprintf (STREAM, "\t.word %LL%d-%LL%d%s\n",                   \
1551                    CODE_LABEL_NUMBER                                    \
1552                     (XEXP (XEXP (XEXP                                   \
1553                                   (XVECEXP                              \
1554                                     (PATTERN (PREV_INSN (PREV_INSN      \
1555                                                           (TABLE))),    \
1556                                      0, 0), 1), 2), 0)),                \
1557                    NUM,                                                 \
1558                    (TARGET_PDEBUG ? "; default" : ""));                 \
1559     }                                                                   \
1560   while (0)
1561
1562
1563 /* Node: Exception Region Output */
1564 /* (no definitions) */
1565 /* FIXME: Fill in with our own optimized layout.  */
1566
1567 /* Node: Alignment Output */
1568
1569 #define ASM_OUTPUT_ALIGN(FILE, LOG)  \
1570  fprintf (FILE, "\t.align %d\n", (LOG))
1571
1572
1573 /* Node: All Debuggers */
1574
1575 #define DBX_REGISTER_NUMBER(REGNO) \
1576  ((REGNO) == CRIS_SRP_REGNUM ? CRIS_CANONICAL_SRP_REGNUM : (REGNO))
1577
1578 /* FIXME: Investigate DEBUGGER_AUTO_OFFSET, DEBUGGER_ARG_OFFSET.  */
1579
1580
1581 /* Node: DBX Options */
1582
1583 /* Is this correct? Check later.  */
1584 #define DBX_NO_XREFS
1585
1586 #define DBX_CONTIN_LENGTH 0
1587
1588 /* FIXME: Is this needed when we have 0 DBX_CONTIN_LENGTH?  */
1589 #define DBX_CONTIN_CHAR '?'
1590
1591
1592 /* Node: DBX Hooks */
1593 /* (no definitions) */
1594
1595 /* Node: File names and DBX */
1596 /* (no definitions) */
1597
1598
1599 /* Node: SDB and DWARF */
1600 /* (no definitions) */
1601
1602 /* Node: Misc */
1603
1604 /* FIXME: Check this one more time.  */
1605 #define PREDICATE_CODES                                 \
1606  {"cris_orthogonal_operator",                           \
1607   {PLUS, MINUS, IOR, AND, UMIN}},                       \
1608  {"cris_commutative_orth_op",                           \
1609   {PLUS, IOR, AND, UMIN}},                              \
1610  {"cris_operand_extend_operator",                       \
1611   {PLUS, MINUS, UMIN}},                                 \
1612  {"cris_additive_operand_extend_operator",              \
1613   {PLUS, MINUS}},                                       \
1614  {"cris_extend_operator",                               \
1615   {ZERO_EXTEND, SIGN_EXTEND}},                          \
1616  {"cris_plus_or_bound_operator",                        \
1617   {PLUS, UMIN}},                                        \
1618  {"cris_mem_op",                                        \
1619   {MEM}},                                               \
1620  {"cris_bdap_operand",                                  \
1621   {SUBREG, REG, LABEL_REF, SYMBOL_REF, MEM, CONST_INT,  \
1622    CONST_DOUBLE, CONST, SIGN_EXTEND}},                  \
1623  {"cris_bdap_biap_operand",                             \
1624   {SUBREG, REG, LABEL_REF, SYMBOL_REF, MEM, CONST_INT,  \
1625    CONST_DOUBLE, CONST, SIGN_EXTEND, MULT}},            \
1626  {"cris_general_operand_or_gotless_symbol",             \
1627   {CONST_INT, CONST_DOUBLE, CONST, SYMBOL_REF,          \
1628    LABEL_REF, SUBREG, REG, MEM}},                       \
1629  {"cris_general_operand_or_symbol",                     \
1630   {CONST_INT, CONST_DOUBLE, CONST, SYMBOL_REF,          \
1631    LABEL_REF, SUBREG, REG, MEM}},                       \
1632  {"cris_general_operand_or_plt_symbol",                 \
1633   {CONST_INT, CONST_DOUBLE, CONST, SYMBOL_REF,          \
1634    LABEL_REF, SUBREG, REG, MEM}},                       \
1635  {"cris_mem_call_operand",                              \
1636   {MEM}},
1637
1638 /* A combination of the bound (umin) insn together with a
1639    sign-extended add via the table to PC seems optimal.
1640    If the table overflows, the assembler will take care of it.
1641    Theoretically, in extreme cases (uncertain if they occur), an error
1642    will be emitted, so FIXME: Check how large case-tables are emitted,
1643    possible add an option to emit SImode case-tables.  */
1644 #define CASE_VECTOR_MODE HImode
1645
1646 #define CASE_VECTOR_PC_RELATIVE 1
1647
1648 /* FIXME: Investigate CASE_VECTOR_SHORTEN_MODE to make sure HImode is not
1649    used when broken-.word could possibly fail (plus testcase).  */
1650
1651 #define FIXUNS_TRUNC_LIKE_FIX_TRUNC
1652
1653 /* This is the number of bytes that can be moved in one
1654    reasonably fast instruction sequence.  For CRIS, this is two
1655    instructions: mem => reg, reg => mem.  */
1656 #define MOVE_MAX 4
1657
1658 /* Maybe SHIFT_COUNT_TRUNCATED is safe to define?  FIXME: Check later.  */
1659
1660 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1661
1662 #define Pmode SImode
1663
1664 #define FUNCTION_MODE QImode
1665
1666 #define NO_IMPLICIT_EXTERN_C
1667
1668 /*
1669  * Local variables:
1670  * eval: (c-set-style "gnu")
1671  * indent-tabs-mode: t
1672  * End:
1673  */