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, 2007, 2008, 2010
   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 3, 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 COPYING3.  If not see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 #undef DARWIN_PPC
  23 #define DARWIN_PPC 1
  24
  25 #undef  TARGET_VERSION
  26 #define TARGET_VERSION fprintf (stderr, " (Darwin/PowerPC)");
  27
  28 /* The "Darwin ABI" is mostly like AIX, but with some key differences.  */
  29
  30 #define DEFAULT_ABI ABI_DARWIN
  31
  32 #ifdef IN_LIBGCC2
  33 #undef TARGET_64BIT
  34 #ifdef __powerpc64__
  35 #define TARGET_64BIT 1
  36 #else
  37 #define TARGET_64BIT 0
  38 #endif
  39 #endif
  40
  41 /* The object file format is Mach-O.  */
  42
  43 #define TARGET_OBJECT_FORMAT OBJECT_MACHO
  44
  45 /* Size of the Obj-C jump buffer.  */
  46 #define OBJC_JBLEN ((TARGET_64BIT) ? (26*2 + 18*2 + 129 + 1) : (26 + 18*2 + 129 + 1))
  47
  48 /* We're not ever going to do TOCs.  */
  49
  50 #define TARGET_TOC 0
  51 #define TARGET_NO_TOC 1
  52
  53 /* Override the default rs6000 definition.  */
  54 #undef  PTRDIFF_TYPE
  55 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
  56
  57 #define TARGET_OS_CPP_BUILTINS()                        \
  58   do                                                    \
  59     {                                                   \
  60       if (!TARGET_64BIT) builtin_define ("__ppc__");    \
  61       if (TARGET_64BIT) builtin_define ("__ppc64__");   \
  62       builtin_define ("__POWERPC__");                   \
  63       builtin_define ("__NATURAL_ALIGNMENT__");         \
  64       darwin_cpp_builtins (pfile);                      \
  65     }                                                   \
  66   while (0)
  67
  68 /* Generate branch islands stubs if this is true.  */
  69 extern int darwin_emit_branch_islands;
  70
  71 #define SUBTARGET_OVERRIDE_OPTIONS darwin_rs6000_override_options ()
  72
  73 #define C_COMMON_OVERRIDE_OPTIONS do {                                  \
  74   /* On powerpc, __cxa_get_exception_ptr is available starting in the   \
  75      10.4.6 libstdc++.dylib.  */                                        \
  76   if (strverscmp (darwin_macosx_version_min, "10.4.6") < 0              \
  77       && flag_use_cxa_get_exception_ptr == 2)                           \
  78     flag_use_cxa_get_exception_ptr = 0;                                 \
  79   if (flag_mkernel)                                                     \
  80     flag_no_builtin = 1;                                                \
  81   SUBTARGET_C_COMMON_OVERRIDE_OPTIONS;                                  \
  82 } while (0)
  83
  84 /* Darwin has 128-bit long double support in libc in 10.4 and later.
  85    Default to 128-bit long doubles even on earlier platforms for ABI
  86    consistency; arithmetic will work even if libc and libm support is
  87    not available.  */
  88
  89 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
  90
  91
  92 /* We want -fPIC by default, unless we're using -static to compile for
  93    the kernel or some such.  The "-faltivec" option should have been
  94    called "-maltivec" all along.  */
  95
  96 #define CC1_SPEC "\
  97   %(cc1_cpu) \
  98   %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
  99   %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
 100   %{!mmacosx-version-min=*:-mmacosx-version-min=%(darwin_minversion)} \
 101   %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
 102   %{faltivec:-maltivec -include altivec.h} %{fno-altivec:-mno-altivec} \
 103   %<faltivec %<fno-altivec " \
 104   DARWIN_CC1_SPEC
 105
 106 #define DARWIN_ARCH_SPEC "%{m64:ppc64;:ppc}"
 107
 108 #define DARWIN_SUBARCH_SPEC "                   \
 109  %{m64: ppc64}                                  \
 110  %{!m64:                                        \
 111  %{mcpu=601:ppc601;                             \
 112    mcpu=603:ppc603;                             \
 113    mcpu=603e:ppc603;                            \
 114    mcpu=604:ppc604;                             \
 115    mcpu=604e:ppc604e;                           \
 116    mcpu=740:ppc750;                             \
 117    mcpu=750:ppc750;                             \
 118    mcpu=G3:ppc750;                              \
 119    mcpu=7400:ppc7400;                           \
 120    mcpu=G4:ppc7400;                             \
 121    mcpu=7450:ppc7450;                           \
 122    mcpu=970:ppc970;                             \
 123    mcpu=power4:ppc970;                          \
 124    mcpu=G5:ppc970;                              \
 125    :ppc}}"
 126
 127 /* crt2.o is at least partially required for 10.3.x and earlier.  */
 128 #define DARWIN_CRT2_SPEC \
 129   "%{!m64:%:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s)}"
 130
 131 /* Determine a minimum version based on compiler options.  */
 132 #define DARWIN_MINVERSION_SPEC                                  \
 133   "%{m64:%{fgnu-runtime:10.4;                                   \
 134            ,objective-c|,objc-cpp-output:10.5;                  \
 135            ,objective-c-header:10.5;                            \
 136            ,objective-c++|,objective-c++-cpp-output:10.5;       \
 137            ,objective-c++-header|,objc++-cpp-output:10.5;       \
 138            :10.4};                                              \
 139      shared-libgcc:10.3;                                        \
 140      :10.1}"
 141
 142 #undef SUBTARGET_EXTRA_SPECS
 143 #define SUBTARGET_EXTRA_SPECS                   \
 144   DARWIN_EXTRA_SPECS                            \
 145   { "darwin_arch", DARWIN_ARCH_SPEC },          \
 146   { "darwin_crt2", DARWIN_CRT2_SPEC },          \
 147   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 148
 149 /* Output a .machine directive.  */
 150 #undef TARGET_ASM_FILE_START
 151 #define TARGET_ASM_FILE_START rs6000_darwin_file_start
 152
 153 /* Make both r2 and r13 available for allocation.  */
 154 #define FIXED_R2 0
 155 #define FIXED_R13 0
 156
 157 /* Base register for access to local variables of the function.  */
 158
 159 #undef  HARD_FRAME_POINTER_REGNUM
 160 #define HARD_FRAME_POINTER_REGNUM 30
 161
 162 #undef  RS6000_PIC_OFFSET_TABLE_REGNUM
 163 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
 164
 165 /* Pad the outgoing args area to 16 bytes instead of the usual 8.  */
 166
 167 #undef STARTING_FRAME_OFFSET
 168 #define STARTING_FRAME_OFFSET                                           \
 169   (FRAME_GROWS_DOWNWARD                                                 \
 170    ? 0                                                                  \
 171    : (RS6000_ALIGN (crtl->outgoing_args_size, 16)               \
 172       + RS6000_SAVE_AREA))
 173
 174 #undef STACK_DYNAMIC_OFFSET
 175 #define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
 176   (RS6000_ALIGN (crtl->outgoing_args_size, 16)          \
 177    + (STACK_POINTER_OFFSET))
 178
 179 /* Define cutoff for using external functions to save floating point.
 180    Currently on Darwin, always use inline stores.  */
 181
 182 #undef  FP_SAVE_INLINE
 183 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
 184 #undef GP_SAVE_INLINE
 185 #define GP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 32)
 186
 187 /* Darwin uses a function call if everything needs to be saved/restored.  */
 188 #undef WORLD_SAVE_P
 189 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
 190
 191 /* The assembler wants the alternate register names, but without
 192    leading percent sign.  */
 193 #undef REGISTER_NAMES
 194 #define REGISTER_NAMES                                                  \
 195 {                                                                       \
 196      "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",             \
 197      "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",             \
 198     "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",             \
 199     "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",             \
 200      "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",             \
 201      "f8",  "f9", "f10", "f11", "f12", "f13", "f14", "f15",             \
 202     "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",             \
 203     "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",             \
 204      "mq",  "lr", "ctr",  "ap",                                         \
 205     "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",             \
 206     "xer",                                                              \
 207      "v0",  "v1",  "v2",  "v3",  "v4",  "v5",  "v6",  "v7",             \
 208      "v8",  "v9", "v10", "v11", "v12", "v13", "v14", "v15",             \
 209     "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",             \
 210     "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",             \
 211     "vrsave", "vscr",                                                   \
 212     "spe_acc", "spefscr",                                               \
 213     "sfp"                                                               \
 214 }
 215
 216 /* This outputs NAME to FILE.  */
 217
 218 #undef  RS6000_OUTPUT_BASENAME
 219 #define RS6000_OUTPUT_BASENAME(FILE, NAME)      \
 220     assemble_name (FILE, NAME)
 221
 222 /* Globalizing directive for a label.  */
 223 #undef GLOBAL_ASM_OP
 224 #define GLOBAL_ASM_OP "\t.globl "
 225 #undef TARGET_ASM_GLOBALIZE_LABEL
 226
 227 /* This is how to output an internal label prefix.  rs6000.c uses this
 228    when generating traceback tables.  */
 229 /* Not really used for Darwin?  */
 230
 231 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
 232 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 233   fprintf (FILE, "%s", PREFIX)
 234
 235 /* Override the standard rs6000 definition.  */
 236
 237 #undef ASM_COMMENT_START
 238 #define ASM_COMMENT_START ";"
 239
 240 /* FP save and restore routines.  */
 241 #define SAVE_FP_PREFIX "._savef"
 242 #define SAVE_FP_SUFFIX ""
 243 #define RESTORE_FP_PREFIX "._restf"
 244 #define RESTORE_FP_SUFFIX ""
 245
 246 /* This is how to output an assembler line that says to advance
 247    the location counter to a multiple of 2**LOG bytes using the
 248    "nop" instruction as padding.  */
 249
 250 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG)                   \
 251   do                                                          \
 252     {                                                         \
 253       if ((LOG) < 3)                                          \
 254         {                                                     \
 255           ASM_OUTPUT_ALIGN (FILE,LOG);                        \
 256         }                                                     \
 257       else /* nop == ori r0,r0,0 */                           \
 258         fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG));  \
 259     } while (0)
 260
 261 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 262 /* This is supported in cctools 465 and later.  The macro test
 263    above prevents using it in earlier build environments.  */
 264 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)          \
 265   if ((LOG) != 0)                                             \
 266     {                                                         \
 267       if ((MAX_SKIP) == 0)                                    \
 268         fprintf ((FILE), "\t.p2align %d\n", (LOG));           \
 269       else                                                    \
 270         fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
 271     }
 272 #endif
 273
 274 /* Generate insns to call the profiler.  */
 275
 276 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 277
 278 /* Function name to call to do profiling.  */
 279
 280 #define RS6000_MCOUNT "*mcount"
 281
 282 /* Default processor: G4, and G5 for 64-bit.  */
 283
 284 #undef PROCESSOR_DEFAULT
 285 #define PROCESSOR_DEFAULT  PROCESSOR_PPC7400
 286 #undef PROCESSOR_DEFAULT64
 287 #define PROCESSOR_DEFAULT64  PROCESSOR_POWER4
 288
 289 /* Default target flag settings.  Despite the fact that STMW/LMW
 290    serializes, it's still a big code size win to use them.  Use FSEL by
 291    default as well.  */
 292
 293 #undef  TARGET_DEFAULT
 294 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
 295                       | MASK_PPC_GFXOPT)
 296
 297 /* Darwin only runs on PowerPC, so short-circuit POWER patterns.  */
 298 #undef  TARGET_POWER
 299 #define TARGET_POWER 0
 300 #undef  TARGET_IEEEQUAD
 301 #define TARGET_IEEEQUAD 0
 302
 303 /* Since Darwin doesn't do TOCs, stub this out.  */
 304
 305 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  ((void)X, (void)MODE, 0)
 306
 307 /* Unlike most other PowerPC targets, chars are signed, for
 308    consistency with other Darwin architectures.  */
 309
 310 #undef DEFAULT_SIGNED_CHAR
 311 #define DEFAULT_SIGNED_CHAR (1)
 312
 313 /* Given an rtx X being reloaded into a reg required to be
 314    in class CLASS, return the class of reg to actually use.
 315    In general this is just CLASS; but on some machines
 316    in some cases it is preferable to use a more restrictive class.
 317
 318    On the RS/6000, we have to return NO_REGS when we want to reload a
 319    floating-point CONST_DOUBLE to force it to be copied to memory.
 320
 321    Don't allow R0 when loading the address of, or otherwise furtling with,
 322    a SYMBOL_REF.  */
 323
 324 #undef PREFERRED_RELOAD_CLASS
 325 #define PREFERRED_RELOAD_CLASS(X,CLASS)                         \
 326   ((CONSTANT_P (X)                                              \
 327     && reg_classes_intersect_p ((CLASS), FLOAT_REGS))           \
 328    ? NO_REGS                                                    \
 329    : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)      \
 330       && reg_class_subset_p (BASE_REGS, (CLASS)))               \
 331    ? BASE_REGS                                                  \
 332    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT                 \
 333       && (CLASS) == NON_SPECIAL_REGS)                           \
 334    ? GENERAL_REGS                                               \
 335    : (CLASS))
 336
 337 /* Compute field alignment.  This is similar to the version of the
 338    macro in the Apple version of GCC, except that version supports
 339    'mac68k' alignment, and that version uses the computed alignment
 340    always for the first field of a structure.  The first-field
 341    behavior is dealt with by
 342    darwin_rs6000_special_round_type_align.  */
 343 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED)     \
 344   (TARGET_ALIGN_NATURAL ? (COMPUTED)            \
 345    : (COMPUTED) == 128 ? 128                    \
 346    : MIN ((COMPUTED), 32))
 347
 348 /* Darwin increases natural record alignment to doubleword if the first
 349    field is an FP double while the FP fields remain word aligned.  */
 350 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                     \
 351   ((TREE_CODE (STRUCT) == RECORD_TYPE                                     \
 352     || TREE_CODE (STRUCT) == UNION_TYPE                                   \
 353     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                             \
 354    && TARGET_ALIGN_NATURAL == 0                                           \
 355    ? darwin_rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
 356    : (TREE_CODE (STRUCT) == VECTOR_TYPE                                   \
 357       && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT)))                        \
 358    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)                             \
 359    : MAX ((COMPUTED), (SPECIFIED)))
 360
 361 /* Specify padding for the last element of a block move between
 362    registers and memory.  FIRST is nonzero if this is the only
 363    element.  */
 364 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 365   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 366
 367 #define DOUBLE_INT_ASM_OP "\t.quad\t"
 368
 369 /* For binary compatibility with 2.95; Darwin C APIs use bool from
 370    stdbool.h, which was an int-sized enum in 2.95.  Users can explicitly
 371    choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
 372 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
 373
 374 #undef REGISTER_TARGET_PRAGMAS
 375 #define REGISTER_TARGET_PRAGMAS() \
 376   do \
 377     { \
 378       DARWIN_REGISTER_TARGET_PRAGMAS(); \
 379       targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
 380     } \
 381   while (0)
 382
 383 #ifdef IN_LIBGCC2
 384 #include <stdbool.h>
 385 #endif
 386
 387 #if !defined(__LP64__) && !defined(DARWIN_LIBSYSTEM_HAS_UNWIND)
 388 #define MD_UNWIND_SUPPORT "config/rs6000/darwin-unwind.h"
 389 #endif
 390
 391 /* True, iff we're generating fast turn around debugging code.  When
 392    true, we arrange for function prologues to start with 5 nops so
 393    that gdb may insert code to redirect them, and for data to be
 394    accessed indirectly.  The runtime uses this indirection to forward
 395    references for data to the original instance of that data.  */
 396
 397 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
 398
 399 /* This is the reserved direct dispatch address for Objective-C.  */
 400 #define OFFS_MSGSEND_FAST               0xFFFEFF00
 401
 402 /* This is the reserved ivar address Objective-C.  */
 403 #define OFFS_ASSIGNIVAR_FAST            0xFFFEFEC0
 404
 405 /* Old versions of Mac OS/Darwin don't have C99 functions available.  */
 406 #undef TARGET_C99_FUNCTIONS
 407 #define TARGET_C99_FUNCTIONS                                    \
 408   (TARGET_64BIT                                                 \
 409    || strverscmp (darwin_macosx_version_min, "10.3") >= 0)
 410
 411 /* When generating kernel code or kexts, we don't use Altivec by
 412    default, as kernel code doesn't save/restore those registers.  */
 413 #define OS_MISSING_ALTIVEC (flag_mkernel || flag_apple_kext)
 414
 415 /* Darwin has support for section anchors on powerpc*.
 416    It is disabled for any section containing a "zero-sized item" (because these
 417    are re-written as size=1 to be compatible with the OSX ld64).
 418    The re-writing would interfere with the computation of anchor offsets.
 419    Therefore, we place zero-sized items in their own sections and make such
 420    sections unavailable to section anchoring.  */
 421
 422 #undef TARGET_ASM_OUTPUT_ANCHOR
 423 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
 424
 425 #undef TARGET_USE_ANCHORS_FOR_SYMBOL_P
 426 #define TARGET_USE_ANCHORS_FOR_SYMBOL_P darwin_use_anchors_for_symbol_p
 427
 428 #undef DARWIN_SECTION_ANCHORS
 429 #define DARWIN_SECTION_ANCHORS 1
 430
 431 /* PPC Darwin has to rename some of the long double builtins.  */
 432 #undef  SUBTARGET_INIT_BUILTINS
 433 #define SUBTARGET_INIT_BUILTINS                                         \
 434 do {                                                                    \
 435   darwin_patch_builtins ();                                             \
 436   rs6000_builtin_decls[(unsigned) (RS6000_BUILTIN_CFSTRING)]            \
 437     = darwin_init_cfstring_builtins ((unsigned) (RS6000_BUILTIN_CFSTRING)); \
 438 } while(0)