gcc/config/rs6000/darwin.h

   1 /* Target definitions for PowerPC running Darwin (Mac OS X).
   2    Copyright (C) 1997-2014 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     "tfhar", "tfiar", "texasr"                                          \
 210 }
 211
 212 /* This outputs NAME to FILE.  */
 213
 214 #undef  RS6000_OUTPUT_BASENAME
 215 #define RS6000_OUTPUT_BASENAME(FILE, NAME)      \
 216     assemble_name (FILE, NAME)
 217
 218 /* Globalizing directive for a label.  */
 219 #undef GLOBAL_ASM_OP
 220 #define GLOBAL_ASM_OP "\t.globl "
 221 #undef TARGET_ASM_GLOBALIZE_LABEL
 222
 223 /* This is how to output an internal label prefix.  rs6000.c uses this
 224    when generating traceback tables.  */
 225 /* Not really used for Darwin?  */
 226
 227 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
 228 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 229   fprintf (FILE, "%s", PREFIX)
 230
 231 /* Override the standard rs6000 definition.  */
 232
 233 #undef ASM_COMMENT_START
 234 #define ASM_COMMENT_START ";"
 235
 236 /* This is how to output an assembler line that says to advance
 237    the location counter to a multiple of 2**LOG bytes using the
 238    "nop" instruction as padding.  */
 239
 240 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG)                   \
 241   do                                                          \
 242     {                                                         \
 243       if ((LOG) < 3)                                          \
 244         {                                                     \
 245           ASM_OUTPUT_ALIGN (FILE,LOG);                        \
 246         }                                                     \
 247       else /* nop == ori r0,r0,0 */                           \
 248         fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG));  \
 249     } while (0)
 250
 251 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 252 /* This is supported in cctools 465 and later.  The macro test
 253    above prevents using it in earlier build environments.  */
 254 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)          \
 255   if ((LOG) != 0)                                             \
 256     {                                                         \
 257       if ((MAX_SKIP) == 0)                                    \
 258         fprintf ((FILE), "\t.p2align %d\n", (LOG));           \
 259       else                                                    \
 260         fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
 261     }
 262 #endif
 263
 264 /* Generate insns to call the profiler.  */
 265
 266 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 267
 268 /* Function name to call to do profiling.  */
 269
 270 #define RS6000_MCOUNT "*mcount"
 271
 272 /* Default processor: G4, and G5 for 64-bit.  */
 273
 274 #undef PROCESSOR_DEFAULT
 275 #define PROCESSOR_DEFAULT  PROCESSOR_PPC7400
 276 #undef PROCESSOR_DEFAULT64
 277 #define PROCESSOR_DEFAULT64  PROCESSOR_POWER4
 278
 279 /* Default target flag settings.  Despite the fact that STMW/LMW
 280    serializes, it's still a big code size win to use them.  Use FSEL by
 281    default as well.  */
 282
 283 #undef  TARGET_DEFAULT
 284 #define TARGET_DEFAULT (MASK_MULTIPLE | MASK_PPC_GFXOPT)
 285
 286 /* Darwin always uses IBM long double, never IEEE long double.  */
 287 #undef  TARGET_IEEEQUAD
 288 #define TARGET_IEEEQUAD 0
 289
 290 /* Since Darwin doesn't do TOCs, stub this out.  */
 291
 292 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  ((void)X, (void)MODE, 0)
 293
 294 /* Unlike most other PowerPC targets, chars are signed, for
 295    consistency with other Darwin architectures.  */
 296
 297 #undef DEFAULT_SIGNED_CHAR
 298 #define DEFAULT_SIGNED_CHAR (1)
 299
 300 /* Given an rtx X being reloaded into a reg required to be
 301    in class CLASS, return the class of reg to actually use.
 302    In general this is just CLASS; but on some machines
 303    in some cases it is preferable to use a more restrictive class.
 304
 305    On the RS/6000, we have to return NO_REGS when we want to reload a
 306    floating-point CONST_DOUBLE to force it to be copied to memory.
 307
 308    Don't allow R0 when loading the address of, or otherwise furtling with,
 309    a SYMBOL_REF.  */
 310
 311 #undef PREFERRED_RELOAD_CLASS
 312 #define PREFERRED_RELOAD_CLASS(X,CLASS)                         \
 313   ((CONSTANT_P (X)                                              \
 314     && reg_classes_intersect_p ((CLASS), FLOAT_REGS))           \
 315    ? NO_REGS                                                    \
 316    : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)      \
 317       && reg_class_subset_p (BASE_REGS, (CLASS)))               \
 318    ? BASE_REGS                                                  \
 319    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT                 \
 320       && (CLASS) == NON_SPECIAL_REGS)                           \
 321    ? GENERAL_REGS                                               \
 322    : (CLASS))
 323
 324 /* Compute field alignment.
 325    This implements the 'power' alignment rule by pegging the alignment of
 326    items (beyond the first aggregate field) to 32 bits.  The pegging is
 327    suppressed for vector and long double items (both 128 in size).
 328    There is a dummy use of the FIELD argument to avoid an unused variable
 329    warning (see PR59496).  */
 330 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED)                     \
 331   ((void) (FIELD),                                              \
 332     (TARGET_ALIGN_NATURAL                                       \
 333      ? (COMPUTED)                                               \
 334      : (COMPUTED) == 128                                        \
 335         ? 128                                                   \
 336         : MIN ((COMPUTED), 32)))
 337
 338 /* Darwin increases natural record alignment to doubleword if the first
 339    field is an FP double while the FP fields remain word aligned.  */
 340 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                     \
 341   ((TREE_CODE (STRUCT) == RECORD_TYPE                                     \
 342     || TREE_CODE (STRUCT) == UNION_TYPE                                   \
 343     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                             \
 344    && TARGET_ALIGN_NATURAL == 0                                           \
 345    ? darwin_rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
 346    : (TREE_CODE (STRUCT) == VECTOR_TYPE                                   \
 347       && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT)))                        \
 348    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)                             \
 349    : MAX ((COMPUTED), (SPECIFIED)))
 350
 351 /* Specify padding for the last element of a block move between
 352    registers and memory.  FIRST is nonzero if this is the only
 353    element.  */
 354 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 355   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 356
 357 #define DOUBLE_INT_ASM_OP "\t.quad\t"
 358
 359 /* For binary compatibility with 2.95; Darwin C APIs use bool from
 360    stdbool.h, which was an int-sized enum in 2.95.  Users can explicitly
 361    choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
 362 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
 363
 364 #undef REGISTER_TARGET_PRAGMAS
 365 #define REGISTER_TARGET_PRAGMAS() \
 366   do \
 367     { \
 368       DARWIN_REGISTER_TARGET_PRAGMAS(); \
 369       targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
 370     } \
 371   while (0)
 372
 373 #ifdef IN_LIBGCC2
 374 #include <stdbool.h>
 375 #endif
 376
 377 /* True, iff we're generating fast turn around debugging code.  When
 378    true, we arrange for function prologues to start with 5 nops so
 379    that gdb may insert code to redirect them, and for data to be
 380    accessed indirectly.  The runtime uses this indirection to forward
 381    references for data to the original instance of that data.  */
 382
 383 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
 384
 385 /* This is the reserved direct dispatch address for Objective-C.  */
 386 #define OFFS_MSGSEND_FAST               0xFFFEFF00
 387
 388 /* This is the reserved ivar address Objective-C.  */
 389 #define OFFS_ASSIGNIVAR_FAST            0xFFFEFEC0
 390
 391 /* Old versions of Mac OS/Darwin don't have C99 functions available.  */
 392 #undef TARGET_LIBC_HAS_FUNCTION
 393 #define TARGET_LIBC_HAS_FUNCTION darwin_libc_has_function
 394
 395 /* When generating kernel code or kexts, we don't use Altivec by
 396    default, as kernel code doesn't save/restore those registers.  */
 397 #define OS_MISSING_ALTIVEC (flag_mkernel || flag_apple_kext)
 398
 399 /* Darwin has support for section anchors on powerpc*.
 400    It is disabled for any section containing a "zero-sized item" (because these
 401    are re-written as size=1 to be compatible with the OSX ld64).
 402    The re-writing would interfere with the computation of anchor offsets.
 403    Therefore, we place zero-sized items in their own sections and make such
 404    sections unavailable to section anchoring.  */
 405
 406 #undef TARGET_ASM_OUTPUT_ANCHOR
 407 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
 408
 409 #undef TARGET_USE_ANCHORS_FOR_SYMBOL_P
 410 #define TARGET_USE_ANCHORS_FOR_SYMBOL_P darwin_use_anchors_for_symbol_p
 411
 412 #undef DARWIN_SECTION_ANCHORS
 413 #define DARWIN_SECTION_ANCHORS 1
 414
 415 /* PPC Darwin has to rename some of the long double builtins.  */
 416 #undef  SUBTARGET_INIT_BUILTINS
 417 #define SUBTARGET_INIT_BUILTINS                                         \
 418 do {                                                                    \
 419   darwin_patch_builtins ();                                             \
 420   rs6000_builtin_decls[(unsigned) (RS6000_BUILTIN_CFSTRING)]            \
 421     = darwin_init_cfstring_builtins ((unsigned) (RS6000_BUILTIN_CFSTRING)); \
 422 } while(0)
 423
 424 /* So far, there is no rs6000_fold_builtin, if one is introduced, then
 425    this will need to be modified similar to the x86 case.  */
 426 #define TARGET_FOLD_BUILTIN SUBTARGET_FOLD_BUILTIN
 427
 428 /* Use standard DWARF numbering for DWARF debugging information.  */
 429 #define RS6000_USE_DWARF_NUMBERING
 430