gcc/config/rs6000/darwin.h

   1 /* Target definitions for PowerPC running Darwin (Mac OS X).
   2    Copyright (C) 1997-2012 Free Software Foundation, Inc.
   3    Contributed by Apple Computer Inc.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #undef DARWIN_PPC
  22 #define DARWIN_PPC 1
  23
  24 /* The "Darwin ABI" is mostly like AIX, but with some key differences.  */
  25
  26 #define DEFAULT_ABI ABI_DARWIN
  27
  28 #ifdef IN_LIBGCC2
  29 #undef TARGET_64BIT
  30 #ifdef __powerpc64__
  31 #define TARGET_64BIT 1
  32 #else
  33 #define TARGET_64BIT 0
  34 #endif
  35 #endif
  36
  37 /* The object file format is Mach-O.  */
  38
  39 #define TARGET_OBJECT_FORMAT OBJECT_MACHO
  40
  41 /* Size of the Obj-C jump buffer.  */
  42 #define OBJC_JBLEN ((TARGET_64BIT) ? (26*2 + 18*2 + 129 + 1) : (26 + 18*2 + 129 + 1))
  43
  44 /* We're not ever going to do TOCs.  */
  45
  46 #define TARGET_TOC 0
  47 #define TARGET_NO_TOC 1
  48
  49 /* Override the default rs6000 definition.  */
  50 #undef  PTRDIFF_TYPE
  51 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
  52
  53 #define TARGET_OS_CPP_BUILTINS()                        \
  54   do                                                    \
  55     {                                                   \
  56       if (!TARGET_64BIT) builtin_define ("__ppc__");    \
  57       if (TARGET_64BIT) builtin_define ("__ppc64__");   \
  58       builtin_define ("__POWERPC__");                   \
  59       builtin_define ("__NATURAL_ALIGNMENT__");         \
  60       darwin_cpp_builtins (pfile);                      \
  61     }                                                   \
  62   while (0)
  63
  64 /* Generate branch islands stubs if this is true.  */
  65 extern int darwin_emit_branch_islands;
  66
  67 #define SUBTARGET_OVERRIDE_OPTIONS darwin_rs6000_override_options ()
  68
  69 #define C_COMMON_OVERRIDE_OPTIONS do {                                  \
  70   /* On powerpc, __cxa_get_exception_ptr is available starting in the   \
  71      10.4.6 libstdc++.dylib.  */                                        \
  72   if (strverscmp (darwin_macosx_version_min, "10.4.6") < 0              \
  73       && flag_use_cxa_get_exception_ptr == 2)                           \
  74     flag_use_cxa_get_exception_ptr = 0;                                 \
  75   if (flag_mkernel)                                                     \
  76     flag_no_builtin = 1;                                                \
  77   SUBTARGET_C_COMMON_OVERRIDE_OPTIONS;                                  \
  78 } while (0)
  79
  80 /* Darwin has 128-bit long double support in libc in 10.4 and later.
  81    Default to 128-bit long doubles even on earlier platforms for ABI
  82    consistency; arithmetic will work even if libc and libm support is
  83    not available.  */
  84
  85 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
  86
  87
  88 /* We want -fPIC by default, unless we're using -static to compile for
  89    the kernel or some such.  The "-faltivec" option should have been
  90    called "-maltivec" all along.  */
  91
  92 #define CC1_SPEC "\
  93   %(cc1_cpu) \
  94   %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
  95   %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
  96   %{!mmacosx-version-min=*:-mmacosx-version-min=%(darwin_minversion)} \
  97   %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
  98   %{faltivec:-maltivec -include altivec.h} %{fno-altivec:-mno-altivec} \
  99   %<faltivec %<fno-altivec " \
 100   DARWIN_CC1_SPEC
 101
 102 #define DARWIN_ARCH_SPEC "%{m64:ppc64;:ppc}"
 103
 104 #define DARWIN_SUBARCH_SPEC "                   \
 105  %{m64: ppc64}                                  \
 106  %{!m64:                                        \
 107  %{mcpu=601:ppc601;                             \
 108    mcpu=603:ppc603;                             \
 109    mcpu=603e:ppc603;                            \
 110    mcpu=604:ppc604;                             \
 111    mcpu=604e:ppc604e;                           \
 112    mcpu=740:ppc750;                             \
 113    mcpu=750:ppc750;                             \
 114    mcpu=G3:ppc750;                              \
 115    mcpu=7400:ppc7400;                           \
 116    mcpu=G4:ppc7400;                             \
 117    mcpu=7450:ppc7450;                           \
 118    mcpu=970:ppc970;                             \
 119    mcpu=power4:ppc970;                          \
 120    mcpu=G5:ppc970;                              \
 121    :ppc}}"
 122
 123 /* crt2.o is at least partially required for 10.3.x and earlier.  */
 124 #define DARWIN_CRT2_SPEC \
 125   "%{!m64:%:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s)}"
 126
 127 /* Determine a minimum version based on compiler options.  */
 128 #define DARWIN_MINVERSION_SPEC                                  \
 129   "%{m64:%{fgnu-runtime:10.4;                                   \
 130            ,objective-c|,objc-cpp-output:10.5;                  \
 131            ,objective-c-header:10.5;                            \
 132            ,objective-c++|,objective-c++-cpp-output:10.5;       \
 133            ,objective-c++-header|,objc++-cpp-output:10.5;       \
 134            :10.4};                                              \
 135      shared-libgcc:10.3;                                        \
 136      :10.1}"
 137
 138 #undef SUBTARGET_EXTRA_SPECS
 139 #define SUBTARGET_EXTRA_SPECS                   \
 140   DARWIN_EXTRA_SPECS                            \
 141   { "darwin_arch", DARWIN_ARCH_SPEC },          \
 142   { "darwin_crt2", DARWIN_CRT2_SPEC },          \
 143   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 144
 145 /* Output a .machine directive.  */
 146 #undef TARGET_ASM_FILE_START
 147 #define TARGET_ASM_FILE_START rs6000_darwin_file_start
 148
 149 /* Make both r2 and r13 available for allocation.  */
 150 #define FIXED_R2 0
 151 #define FIXED_R13 0
 152
 153 /* Base register for access to local variables of the function.  */
 154
 155 #undef  HARD_FRAME_POINTER_REGNUM
 156 #define HARD_FRAME_POINTER_REGNUM 30
 157
 158 #undef  RS6000_PIC_OFFSET_TABLE_REGNUM
 159 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
 160
 161 /* Pad the outgoing args area to 16 bytes instead of the usual 8.  */
 162
 163 #undef STARTING_FRAME_OFFSET
 164 #define STARTING_FRAME_OFFSET                                           \
 165   (FRAME_GROWS_DOWNWARD                                                 \
 166    ? 0                                                                  \
 167    : (RS6000_ALIGN (crtl->outgoing_args_size, 16)               \
 168       + RS6000_SAVE_AREA))
 169
 170 #undef STACK_DYNAMIC_OFFSET
 171 #define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
 172   (RS6000_ALIGN (crtl->outgoing_args_size, 16)          \
 173    + (STACK_POINTER_OFFSET))
 174
 175 /* Darwin uses a function call if everything needs to be saved/restored.  */
 176
 177 #undef WORLD_SAVE_P
 178 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
 179
 180 /* We don't use these on Darwin, they are just place-holders.  */
 181 #define SAVE_FP_PREFIX ""
 182 #define SAVE_FP_SUFFIX ""
 183 #define RESTORE_FP_PREFIX ""
 184 #define RESTORE_FP_SUFFIX ""
 185
 186 /* The assembler wants the alternate register names, but without
 187    leading percent sign.  */
 188 #undef REGISTER_NAMES
 189 #define REGISTER_NAMES                                                  \
 190 {                                                                       \
 191      "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",             \
 192      "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",             \
 193     "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",             \
 194     "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",             \
 195      "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",             \
 196      "f8",  "f9", "f10", "f11", "f12", "f13", "f14", "f15",             \
 197     "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",             \
 198     "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",             \
 199      "mq",  "lr", "ctr",  "ap",                                         \
 200     "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",             \
 201     "xer",                                                              \
 202      "v0",  "v1",  "v2",  "v3",  "v4",  "v5",  "v6",  "v7",             \
 203      "v8",  "v9", "v10", "v11", "v12", "v13", "v14", "v15",             \
 204     "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",             \
 205     "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",             \
 206     "vrsave", "vscr",                                                   \
 207     "spe_acc", "spefscr",                                               \
 208     "sfp"                                                               \
 209 }
 210
 211 /* This outputs NAME to FILE.  */
 212
 213 #undef  RS6000_OUTPUT_BASENAME
 214 #define RS6000_OUTPUT_BASENAME(FILE, NAME)      \
 215     assemble_name (FILE, NAME)
 216
 217 /* Globalizing directive for a label.  */
 218 #undef GLOBAL_ASM_OP
 219 #define GLOBAL_ASM_OP "\t.globl "
 220 #undef TARGET_ASM_GLOBALIZE_LABEL
 221
 222 /* This is how to output an internal label prefix.  rs6000.c uses this
 223    when generating traceback tables.  */
 224 /* Not really used for Darwin?  */
 225
 226 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
 227 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 228   fprintf (FILE, "%s", PREFIX)
 229
 230 /* Override the standard rs6000 definition.  */
 231
 232 #undef ASM_COMMENT_START
 233 #define ASM_COMMENT_START ";"
 234
 235 /* This is how to output an assembler line that says to advance
 236    the location counter to a multiple of 2**LOG bytes using the
 237    "nop" instruction as padding.  */
 238
 239 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG)                   \
 240   do                                                          \
 241     {                                                         \
 242       if ((LOG) < 3)                                          \
 243         {                                                     \
 244           ASM_OUTPUT_ALIGN (FILE,LOG);                        \
 245         }                                                     \
 246       else /* nop == ori r0,r0,0 */                           \
 247         fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG));  \
 248     } while (0)
 249
 250 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 251 /* This is supported in cctools 465 and later.  The macro test
 252    above prevents using it in earlier build environments.  */
 253 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)          \
 254   if ((LOG) != 0)                                             \
 255     {                                                         \
 256       if ((MAX_SKIP) == 0)                                    \
 257         fprintf ((FILE), "\t.p2align %d\n", (LOG));           \
 258       else                                                    \
 259         fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
 260     }
 261 #endif
 262
 263 /* Generate insns to call the profiler.  */
 264
 265 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 266
 267 /* Function name to call to do profiling.  */
 268
 269 #define RS6000_MCOUNT "*mcount"
 270
 271 /* Default processor: G4, and G5 for 64-bit.  */
 272
 273 #undef PROCESSOR_DEFAULT
 274 #define PROCESSOR_DEFAULT  PROCESSOR_PPC7400
 275 #undef PROCESSOR_DEFAULT64
 276 #define PROCESSOR_DEFAULT64  PROCESSOR_POWER4
 277
 278 /* Default target flag settings.  Despite the fact that STMW/LMW
 279    serializes, it's still a big code size win to use them.  Use FSEL by
 280    default as well.  */
 281
 282 #undef  TARGET_DEFAULT
 283 #define TARGET_DEFAULT (MASK_MULTIPLE | MASK_NEW_MNEMONICS | MASK_PPC_GFXOPT)
 284
 285 /* Darwin only runs on PowerPC, so short-circuit POWER patterns.  */
 286 #undef  TARGET_IEEEQUAD
 287 #define TARGET_IEEEQUAD 0
 288
 289 /* Since Darwin doesn't do TOCs, stub this out.  */
 290
 291 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  ((void)X, (void)MODE, 0)
 292
 293 /* Unlike most other PowerPC targets, chars are signed, for
 294    consistency with other Darwin architectures.  */
 295
 296 #undef DEFAULT_SIGNED_CHAR
 297 #define DEFAULT_SIGNED_CHAR (1)
 298
 299 /* Given an rtx X being reloaded into a reg required to be
 300    in class CLASS, return the class of reg to actually use.
 301    In general this is just CLASS; but on some machines
 302    in some cases it is preferable to use a more restrictive class.
 303
 304    On the RS/6000, we have to return NO_REGS when we want to reload a
 305    floating-point CONST_DOUBLE to force it to be copied to memory.
 306
 307    Don't allow R0 when loading the address of, or otherwise furtling with,
 308    a SYMBOL_REF.  */
 309
 310 #undef PREFERRED_RELOAD_CLASS
 311 #define PREFERRED_RELOAD_CLASS(X,CLASS)                         \
 312   ((CONSTANT_P (X)                                              \
 313     && reg_classes_intersect_p ((CLASS), FLOAT_REGS))           \
 314    ? NO_REGS                                                    \
 315    : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)      \
 316       && reg_class_subset_p (BASE_REGS, (CLASS)))               \
 317    ? BASE_REGS                                                  \
 318    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT                 \
 319       && (CLASS) == NON_SPECIAL_REGS)                           \
 320    ? GENERAL_REGS                                               \
 321    : (CLASS))
 322
 323 /* Compute field alignment.  This is similar to the version of the
 324    macro in the Apple version of GCC, except that version supports
 325    'mac68k' alignment, and that version uses the computed alignment
 326    always for the first field of a structure.  The first-field
 327    behavior is dealt with by
 328    darwin_rs6000_special_round_type_align.  */
 329 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED)     \
 330   (TARGET_ALIGN_NATURAL ? (COMPUTED)            \
 331    : (COMPUTED) == 128 ? 128                    \
 332    : MIN ((COMPUTED), 32))
 333
 334 /* Darwin increases natural record alignment to doubleword if the first
 335    field is an FP double while the FP fields remain word aligned.  */
 336 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                     \
 337   ((TREE_CODE (STRUCT) == RECORD_TYPE                                     \
 338     || TREE_CODE (STRUCT) == UNION_TYPE                                   \
 339     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                             \
 340    && TARGET_ALIGN_NATURAL == 0                                           \
 341    ? darwin_rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
 342    : (TREE_CODE (STRUCT) == VECTOR_TYPE                                   \
 343       && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT)))                        \
 344    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)                             \
 345    : MAX ((COMPUTED), (SPECIFIED)))
 346
 347 /* Specify padding for the last element of a block move between
 348    registers and memory.  FIRST is nonzero if this is the only
 349    element.  */
 350 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 351   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 352
 353 #define DOUBLE_INT_ASM_OP "\t.quad\t"
 354
 355 /* For binary compatibility with 2.95; Darwin C APIs use bool from
 356    stdbool.h, which was an int-sized enum in 2.95.  Users can explicitly
 357    choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
 358 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
 359
 360 #undef REGISTER_TARGET_PRAGMAS
 361 #define REGISTER_TARGET_PRAGMAS() \
 362   do \
 363     { \
 364       DARWIN_REGISTER_TARGET_PRAGMAS(); \
 365       targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
 366     } \
 367   while (0)
 368
 369 #ifdef IN_LIBGCC2
 370 #include <stdbool.h>
 371 #endif
 372
 373 /* True, iff we're generating fast turn around debugging code.  When
 374    true, we arrange for function prologues to start with 5 nops so
 375    that gdb may insert code to redirect them, and for data to be
 376    accessed indirectly.  The runtime uses this indirection to forward
 377    references for data to the original instance of that data.  */
 378
 379 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
 380
 381 /* This is the reserved direct dispatch address for Objective-C.  */
 382 #define OFFS_MSGSEND_FAST               0xFFFEFF00
 383
 384 /* This is the reserved ivar address Objective-C.  */
 385 #define OFFS_ASSIGNIVAR_FAST            0xFFFEFEC0
 386
 387 /* Old versions of Mac OS/Darwin don't have C99 functions available.  */
 388 #undef TARGET_C99_FUNCTIONS
 389 #define TARGET_C99_FUNCTIONS                                    \
 390   (TARGET_64BIT                                                 \
 391    || strverscmp (darwin_macosx_version_min, "10.3") >= 0)
 392
 393 /* When generating kernel code or kexts, we don't use Altivec by
 394    default, as kernel code doesn't save/restore those registers.  */
 395 #define OS_MISSING_ALTIVEC (flag_mkernel || flag_apple_kext)
 396
 397 /* Darwin has support for section anchors on powerpc*.
 398    It is disabled for any section containing a "zero-sized item" (because these
 399    are re-written as size=1 to be compatible with the OSX ld64).
 400    The re-writing would interfere with the computation of anchor offsets.
 401    Therefore, we place zero-sized items in their own sections and make such
 402    sections unavailable to section anchoring.  */
 403
 404 #undef TARGET_ASM_OUTPUT_ANCHOR
 405 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
 406
 407 #undef TARGET_USE_ANCHORS_FOR_SYMBOL_P
 408 #define TARGET_USE_ANCHORS_FOR_SYMBOL_P darwin_use_anchors_for_symbol_p
 409
 410 #undef DARWIN_SECTION_ANCHORS
 411 #define DARWIN_SECTION_ANCHORS 1
 412
 413 /* PPC Darwin has to rename some of the long double builtins.  */
 414 #undef  SUBTARGET_INIT_BUILTINS
 415 #define SUBTARGET_INIT_BUILTINS                                         \
 416 do {                                                                    \
 417   darwin_patch_builtins ();                                             \
 418   rs6000_builtin_decls[(unsigned) (RS6000_BUILTIN_CFSTRING)]            \
 419     = darwin_init_cfstring_builtins ((unsigned) (RS6000_BUILTIN_CFSTRING)); \
 420 } while(0)
 421
 422 /* So far, there is no rs6000_fold_builtin, if one is introduced, then
 423    this will need to be modified similar to the x86 case.  */
 424 #define TARGET_FOLD_BUILTIN SUBTARGET_FOLD_BUILTIN