gcc/config/rs6000/darwin.h

   1 /* Target definitions for PowerPC running Darwin (Mac OS X).
   2    Copyright (C) 1997, 2000, 2001, 2003, 2004, 2005, 2006
   3    Free Software Foundation, Inc.
   4    Contributed by Apple Computer Inc.
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 2, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GCC; see the file COPYING.  If not, write to the
  20    Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #undef  TARGET_VERSION
  24 #define TARGET_VERSION fprintf (stderr, " (Darwin/PowerPC)");
  25
  26 /* The "Darwin ABI" is mostly like AIX, but with some key differences.  */
  27
  28 #define DEFAULT_ABI ABI_DARWIN
  29
  30 /* The object file format is Mach-O.  */
  31
  32 #define TARGET_OBJECT_FORMAT OBJECT_MACHO
  33
  34 /* We're not ever going to do TOCs.  */
  35
  36 #define TARGET_TOC 0
  37 #define TARGET_NO_TOC 1
  38
  39 /* Override the default rs6000 definition.  */
  40 #undef  PTRDIFF_TYPE
  41 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
  42
  43 /* Translate config/rs6000/darwin.opt to config/darwin.h.  */
  44 #define TARGET_DYNAMIC_NO_PIC (TARGET_MACHO_DYNAMIC_NO_PIC)
  45
  46 /* Handle #pragma weak and #pragma pack.  */
  47 #define HANDLE_SYSV_PRAGMA 1
  48
  49
  50 #define TARGET_OS_CPP_BUILTINS()                \
  51   do                                            \
  52     {                                           \
  53       if (!TARGET_64BIT) builtin_define ("__ppc__");   \
  54       if (TARGET_64BIT) builtin_define ("__ppc64__");  \
  55       builtin_define ("__POWERPC__");           \
  56       builtin_define ("__NATURAL_ALIGNMENT__"); \
  57       darwin_cpp_builtins (pfile);              \
  58     }                                           \
  59   while (0)
  60
  61
  62 /* The Darwin ABI always includes AltiVec, can't be (validly) turned
  63    off.  */
  64
  65 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
  66 do {                                                                    \
  67   rs6000_altivec_abi = 1;                                               \
  68   TARGET_ALTIVEC_VRSAVE = 1;                                            \
  69   if (DEFAULT_ABI == ABI_DARWIN)                                        \
  70   {                                                                     \
  71     if (MACHO_DYNAMIC_NO_PIC_P)                                         \
  72       {                                                                 \
  73         if (flag_pic)                                                   \
  74             warning (0, "-mdynamic-no-pic overrides -fpic or -fPIC");   \
  75         flag_pic = 0;                                                   \
  76       }                                                                 \
  77     else if (flag_pic == 1)                                             \
  78       {                                                                 \
  79         /* Darwin doesn't support -fpic.  */                            \
  80         flag_pic = 2;                                                   \
  81       }                                                                 \
  82   }                                                                     \
  83   if (TARGET_64BIT && ! TARGET_POWERPC64)                               \
  84     {                                                                   \
  85       target_flags |= MASK_POWERPC64;                                   \
  86       warning (0, "-m64 requires PowerPC64 architecture, enabling");    \
  87     }                                                                   \
  88 } while(0)
  89
  90 /* Darwin has 128-bit long double support in libc in 10.4 and later.
  91    Default to 128-bit long doubles even on earlier platforms for ABI
  92    consistency; arithmetic will work even if libc and libm support is
  93    not available.  */
  94
  95 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
  96
  97
  98 /* We want -fPIC by default, unless we're using -static to compile for
  99    the kernel or some such.  */
 100
 101 #define CC1_SPEC "\
 102 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
 103 %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
 104 %{!static:%{!mdynamic-no-pic:-fPIC}}"
 105
 106 #define DARWIN_SUBARCH_SPEC "                   \
 107  %{m64: ppc64}                                  \
 108  %{!m64:                                        \
 109  %{mcpu=601:ppc601;                             \
 110    mcpu=603:ppc603;                             \
 111    mcpu=603e:ppc603;                            \
 112    mcpu=604:ppc604;                             \
 113    mcpu=604e:ppc604e;                           \
 114    mcpu=740:ppc750;                             \
 115    mcpu=750:ppc750;                             \
 116    mcpu=G3:ppc750;                              \
 117    mcpu=7400:ppc7400;                           \
 118    mcpu=G4:ppc7400;                             \
 119    mcpu=7450:ppc7450;                           \
 120    mcpu=970:ppc970;                             \
 121    mcpu=power4:ppc970;                          \
 122    mcpu=G5:ppc970;                              \
 123    :ppc}}"
 124
 125 /* crt2.o is at least partially required for 10.3.x and earlier.  */
 126 #define DARWIN_CRT2_SPEC \
 127   "%{!m64:%:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s)}"
 128
 129 #undef SUBTARGET_EXTRA_SPECS
 130 #define SUBTARGET_EXTRA_SPECS                   \
 131   { "darwin_arch", "%{m64:ppc64;:ppc}" },       \
 132   { "darwin_crt2", DARWIN_CRT2_SPEC },          \
 133   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 134
 135 /* Output a .machine directive.  */
 136 #undef TARGET_ASM_FILE_START
 137 #define TARGET_ASM_FILE_START rs6000_darwin_file_start
 138
 139 /* The "-faltivec" option should have been called "-maltivec" all
 140    along.  -ffix-and-continue and -findirect-data is for compatibility
 141    for old compilers.  */
 142
 143 #define SUBTARGET_OPTION_TRANSLATE_TABLE                                \
 144   { "-ffix-and-continue", "-mfix-and-continue" },                       \
 145   { "-findirect-data", "-mfix-and-continue" },                          \
 146   { "-faltivec", "-maltivec -include altivec.h" },                      \
 147   { "-fno-altivec", "-mno-altivec" },                                   \
 148   { "-Waltivec-long-deprecated",        "-mwarn-altivec-long" },        \
 149   { "-Wno-altivec-long-deprecated", "-mno-warn-altivec-long" }
 150
 151 /* Make both r2 and r13 available for allocation.  */
 152 #define FIXED_R2 0
 153 #define FIXED_R13 0
 154
 155 /* Base register for access to local variables of the function.  */
 156
 157 #undef  HARD_FRAME_POINTER_REGNUM
 158 #define HARD_FRAME_POINTER_REGNUM 30
 159
 160 #undef  RS6000_PIC_OFFSET_TABLE_REGNUM
 161 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
 162
 163 /* Pad the outgoing args area to 16 bytes instead of the usual 8.  */
 164
 165 #undef STARTING_FRAME_OFFSET
 166 #define STARTING_FRAME_OFFSET                                           \
 167   (FRAME_GROWS_DOWNWARD                                                 \
 168    ? 0                                                                  \
 169    : (RS6000_ALIGN (current_function_outgoing_args_size, 16)            \
 170       + RS6000_SAVE_AREA))
 171
 172 #undef STACK_DYNAMIC_OFFSET
 173 #define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
 174   (RS6000_ALIGN (current_function_outgoing_args_size, 16)               \
 175    + (STACK_POINTER_OFFSET))
 176
 177 /* These are used by -fbranch-probabilities */
 178 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
 179 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
 180                               "__TEXT,__unlikely,regular,pure_instructions"
 181
 182 /* Define cutoff for using external functions to save floating point.
 183    Currently on Darwin, always use inline stores.  */
 184
 185 #undef  FP_SAVE_INLINE
 186 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
 187
 188 /* Darwin uses a function call if everything needs to be saved/restored.  */
 189 #undef WORLD_SAVE_P
 190 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
 191
 192 /* The assembler wants the alternate register names, but without
 193    leading percent sign.  */
 194 #undef REGISTER_NAMES
 195 #define REGISTER_NAMES                                                  \
 196 {                                                                       \
 197      "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",             \
 198      "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",             \
 199     "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",             \
 200     "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",             \
 201      "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",             \
 202      "f8",  "f9", "f10", "f11", "f12", "f13", "f14", "f15",             \
 203     "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",             \
 204     "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",             \
 205      "mq",  "lr", "ctr",  "ap",                                         \
 206     "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",             \
 207     "xer",                                                              \
 208      "v0",  "v1",  "v2",  "v3",  "v4",  "v5",  "v6",  "v7",             \
 209      "v8",  "v9", "v10", "v11", "v12", "v13", "v14", "v15",             \
 210     "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",             \
 211     "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",             \
 212     "vrsave", "vscr",                                                   \
 213     "spe_acc", "spefscr",                                               \
 214     "sfp"                                                               \
 215 }
 216
 217 /* This outputs NAME to FILE.  */
 218
 219 #undef  RS6000_OUTPUT_BASENAME
 220 #define RS6000_OUTPUT_BASENAME(FILE, NAME)      \
 221     assemble_name (FILE, NAME)
 222
 223 /* Globalizing directive for a label.  */
 224 #undef GLOBAL_ASM_OP
 225 #define GLOBAL_ASM_OP "\t.globl "
 226 #undef TARGET_ASM_GLOBALIZE_LABEL
 227
 228 /* This is how to output an internal label prefix.  rs6000.c uses this
 229    when generating traceback tables.  */
 230 /* Not really used for Darwin?  */
 231
 232 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
 233 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 234   fprintf (FILE, "%s", PREFIX)
 235
 236 /* This says how to output an assembler line to define a global common
 237    symbol.  */
 238 /* ? */
 239 #undef  ASM_OUTPUT_ALIGNED_COMMON
 240 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)                    \
 241   do {                                                                  \
 242     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
 243     fputs (".comm ", (FILE));                                           \
 244     RS6000_OUTPUT_BASENAME ((FILE), (NAME));                            \
 245     if (_new_size == 0) _new_size = 1;                                  \
 246     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", _new_size);   \
 247   } while (0)
 248
 249 /* Override the standard rs6000 definition.  */
 250
 251 #undef ASM_COMMENT_START
 252 #define ASM_COMMENT_START ";"
 253
 254 /* FP save and restore routines.  */
 255 #define SAVE_FP_PREFIX "._savef"
 256 #define SAVE_FP_SUFFIX ""
 257 #define RESTORE_FP_PREFIX "._restf"
 258 #define RESTORE_FP_SUFFIX ""
 259
 260 /* This is how to output an assembler line that says to advance
 261    the location counter to a multiple of 2**LOG bytes using the
 262    "nop" instruction as padding.  */
 263
 264 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG)                   \
 265   do                                                          \
 266     {                                                         \
 267       if ((LOG) < 3)                                          \
 268         {                                                     \
 269           ASM_OUTPUT_ALIGN (FILE,LOG);                        \
 270         }                                                     \
 271       else /* nop == ori r0,r0,0 */                           \
 272         fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG));  \
 273     } while (0)
 274
 275 /* Generate insns to call the profiler.  */
 276
 277 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 278 /* This is supported in cctools 465 and later.  The macro test
 279    above prevents using it in earlier build environments.  */
 280 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)           \
 281    if ((LOG) != 0)                                             \
 282      {                                                         \
 283        if ((MAX_SKIP) == 0)                                    \
 284          fprintf ((FILE), "\t.p2align %d\n", (LOG));           \
 285        else                                                    \
 286          fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
 287      }
 288 #endif
 289
 290 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 291
 292 /* Function name to call to do profiling.  */
 293
 294 #define RS6000_MCOUNT "*mcount"
 295
 296 /* Default processor: G4, and G5 for 64-bit.  */
 297
 298 #undef PROCESSOR_DEFAULT
 299 #define PROCESSOR_DEFAULT  PROCESSOR_PPC7400
 300 #undef PROCESSOR_DEFAULT64
 301 #define PROCESSOR_DEFAULT64  PROCESSOR_POWER4
 302
 303 /* Default target flag settings.  Despite the fact that STMW/LMW
 304    serializes, it's still a big code size win to use them.  Use FSEL by
 305    default as well.  */
 306
 307 #undef  TARGET_DEFAULT
 308 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
 309                       | MASK_PPC_GFXOPT)
 310
 311 /* Darwin only runs on PowerPC, so short-circuit POWER patterns.  */
 312 #undef  TARGET_POWER
 313 #define TARGET_POWER 0
 314 #undef  TARGET_IEEEQUAD
 315 #define TARGET_IEEEQUAD 0
 316
 317 /* Since Darwin doesn't do TOCs, stub this out.  */
 318
 319 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  0
 320
 321 /* Unlike most other PowerPC targets, chars are signed, for
 322    consistency with other Darwin architectures.  */
 323
 324 #undef DEFAULT_SIGNED_CHAR
 325 #define DEFAULT_SIGNED_CHAR (1)
 326
 327 /* Given an rtx X being reloaded into a reg required to be
 328    in class CLASS, return the class of reg to actually use.
 329    In general this is just CLASS; but on some machines
 330    in some cases it is preferable to use a more restrictive class.
 331
 332    On the RS/6000, we have to return NO_REGS when we want to reload a
 333    floating-point CONST_DOUBLE to force it to be copied to memory.
 334
 335    Don't allow R0 when loading the address of, or otherwise furtling with,
 336    a SYMBOL_REF.  */
 337
 338 #undef PREFERRED_RELOAD_CLASS
 339 #define PREFERRED_RELOAD_CLASS(X,CLASS)                         \
 340   ((CONSTANT_P (X)                                              \
 341     && reg_classes_intersect_p ((CLASS), FLOAT_REGS))           \
 342    ? NO_REGS                                                    \
 343    : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)      \
 344       && reg_class_subset_p (BASE_REGS, (CLASS)))               \
 345    ? BASE_REGS                                                  \
 346    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT                 \
 347       && (CLASS) == NON_SPECIAL_REGS)                           \
 348    ? GENERAL_REGS                                               \
 349    : (CLASS))
 350
 351 /* Fix for emit_group_load (): force large constants to be pushed via regs.  */
 352 #define ALWAYS_PUSH_CONSTS_USING_REGS_P         1
 353
 354 /* This now supports a natural alignment mode */
 355 /* Darwin word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
 356 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 357   (TARGET_ALIGN_NATURAL ? (COMPUTED) : \
 358   (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
 359               ? get_inner_array_type (FIELD) \
 360               : TREE_TYPE (FIELD)) == DFmode \
 361    ? MIN ((COMPUTED), 32) : (COMPUTED)))
 362
 363 /* Darwin increases natural record alignment to doubleword if the first
 364    field is an FP double while the FP fields remain word aligned.  */
 365 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 366   ((TREE_CODE (STRUCT) == RECORD_TYPE                                   \
 367     || TREE_CODE (STRUCT) == UNION_TYPE                                 \
 368     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                           \
 369    && TARGET_ALIGN_NATURAL == 0                                         \
 370    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 371    : (TREE_CODE (STRUCT) == VECTOR_TYPE                                 \
 372       && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT)))                      \
 373    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)                            \
 374    : MAX ((COMPUTED), (SPECIFIED)))
 375
 376 /* Specify padding for the last element of a block move between
 377    registers and memory.  FIRST is nonzero if this is the only
 378    element.  */
 379 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 380   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 381
 382 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
 383    support 64 bit PowerPC either, so this just keeps things happy.  */
 384 #define DOUBLE_INT_ASM_OP "\t.quad\t"
 385
 386 /* For binary compatibility with 2.95; Darwin C APIs use bool from
 387    stdbool.h, which was an int-sized enum in 2.95.  Users can explicitly
 388    choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
 389 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
 390
 391 #undef REGISTER_TARGET_PRAGMAS
 392 #define REGISTER_TARGET_PRAGMAS() \
 393   do \
 394     { \
 395       DARWIN_REGISTER_TARGET_PRAGMAS(); \
 396       targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
 397     } \
 398   while (0)
 399
 400 #ifdef IN_LIBGCC2
 401 #include <stdbool.h>
 402 #endif
 403
 404 #define MD_UNWIND_SUPPORT "config/rs6000/darwin-unwind.h"
 405
 406 #define HAS_MD_FALLBACK_FRAME_STATE_FOR 1
 407
 408 /* True, iff we're generating fast turn around debugging code.  When
 409    true, we arrange for function prologues to start with 5 nops so
 410    that gdb may insert code to redirect them, and for data to be
 411    accessed indirectly.  The runtime uses this indirection to forward
 412    references for data to the original instance of that data.  */
 413
 414 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
 415
 416 /* This is the reserved direct dispatch address for Objective-C.  */
 417 #define OFFS_MSGSEND_FAST               0xFFFEFF00
 418
 419 /* This is the reserved ivar address Objective-C.  */
 420 #define OFFS_ASSIGNIVAR_FAST            0xFFFEFEC0
 421
 422 /* Old versions of Mac OS/Darwin don't have C99 functions available.  */
 423 #undef TARGET_C99_FUNCTIONS
 424 #define TARGET_C99_FUNCTIONS                                    \
 425   (TARGET_64BIT                                                 \
 426    || (darwin_macosx_version_min                                \
 427        && strverscmp (darwin_macosx_version_min, "10.3") >= 0))