gcc/config/rs6000/darwin.h

   1 /* Target definitions for PowerPC running Darwin (Mac OS X).
   2    Copyright (C) 1997-2017 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   %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
  97   %{faltivec:-maltivec -include altivec.h} %{fno-altivec:-mno-altivec} \
  98   %<faltivec %<fno-altivec " \
  99   DARWIN_CC1_SPEC
 100
 101 #define DARWIN_ARCH_SPEC "%{m64:ppc64;:ppc}"
 102
 103 #define DARWIN_SUBARCH_SPEC "                   \
 104  %{m64: ppc64}                                  \
 105  %{!m64:                                        \
 106  %{mcpu=601:ppc601;                             \
 107    mcpu=603:ppc603;                             \
 108    mcpu=603e:ppc603;                            \
 109    mcpu=604:ppc604;                             \
 110    mcpu=604e:ppc604e;                           \
 111    mcpu=740:ppc750;                             \
 112    mcpu=750:ppc750;                             \
 113    mcpu=G3:ppc750;                              \
 114    mcpu=7400:ppc7400;                           \
 115    mcpu=G4:ppc7400;                             \
 116    mcpu=7450:ppc7450;                           \
 117    mcpu=970:ppc970;                             \
 118    mcpu=power4:ppc970;                          \
 119    mcpu=G5:ppc970;                              \
 120    :ppc}}"
 121
 122 /* crt2.o is at least partially required for 10.3.x and earlier.  */
 123 #define DARWIN_CRT2_SPEC \
 124   "%{!m64:%:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s)}"
 125
 126 #undef SUBTARGET_EXTRA_SPECS
 127 #define SUBTARGET_EXTRA_SPECS                   \
 128   DARWIN_EXTRA_SPECS                            \
 129   { "darwin_arch", DARWIN_ARCH_SPEC },          \
 130   { "darwin_crt2", DARWIN_CRT2_SPEC },          \
 131   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 132
 133 /* Output a .machine directive.  */
 134 #undef TARGET_ASM_FILE_START
 135 #define TARGET_ASM_FILE_START rs6000_darwin_file_start
 136
 137 /* Make both r2 and r13 available for allocation.  */
 138 #define FIXED_R2 0
 139 #define FIXED_R13 0
 140
 141 /* Base register for access to local variables of the function.  */
 142
 143 #undef  HARD_FRAME_POINTER_REGNUM
 144 #define HARD_FRAME_POINTER_REGNUM 30
 145
 146 #undef  RS6000_PIC_OFFSET_TABLE_REGNUM
 147 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
 148
 149 /* Pad the outgoing args area to 16 bytes instead of the usual 8.  */
 150
 151 #undef RS6000_STARTING_FRAME_OFFSET
 152 #define RS6000_STARTING_FRAME_OFFSET                                    \
 153   (RS6000_ALIGN (crtl->outgoing_args_size, 16)                          \
 154    + RS6000_SAVE_AREA)
 155
 156 #undef STACK_DYNAMIC_OFFSET
 157 #define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
 158   (RS6000_ALIGN (crtl->outgoing_args_size, 16)          \
 159    + (STACK_POINTER_OFFSET))
 160
 161 /* Darwin uses a function call if everything needs to be saved/restored.  */
 162
 163 #undef WORLD_SAVE_P
 164 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
 165
 166 /* We don't use these on Darwin, they are just place-holders.  */
 167 #define SAVE_FP_PREFIX ""
 168 #define SAVE_FP_SUFFIX ""
 169 #define RESTORE_FP_PREFIX ""
 170 #define RESTORE_FP_SUFFIX ""
 171
 172 /* The assembler wants the alternate register names, but without
 173    leading percent sign.  */
 174 #undef REGISTER_NAMES
 175 #define REGISTER_NAMES                                                  \
 176 {                                                                       \
 177      "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",             \
 178      "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",             \
 179     "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",             \
 180     "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",             \
 181      "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",             \
 182      "f8",  "f9", "f10", "f11", "f12", "f13", "f14", "f15",             \
 183     "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",             \
 184     "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",             \
 185      "mq",  "lr", "ctr",  "ap",                                         \
 186     "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",             \
 187     "xer",                                                              \
 188      "v0",  "v1",  "v2",  "v3",  "v4",  "v5",  "v6",  "v7",             \
 189      "v8",  "v9", "v10", "v11", "v12", "v13", "v14", "v15",             \
 190     "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",             \
 191     "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",             \
 192     "vrsave", "vscr",                                                   \
 193     "sfp",                                                              \
 194     "tfhar", "tfiar", "texasr"                                          \
 195 }
 196
 197 /* This outputs NAME to FILE.  */
 198
 199 #undef  RS6000_OUTPUT_BASENAME
 200 #define RS6000_OUTPUT_BASENAME(FILE, NAME)      \
 201     assemble_name (FILE, NAME)
 202
 203 /* Globalizing directive for a label.  */
 204 #undef GLOBAL_ASM_OP
 205 #define GLOBAL_ASM_OP "\t.globl "
 206 #undef TARGET_ASM_GLOBALIZE_LABEL
 207
 208 /* This is how to output an internal label prefix.  rs6000.c uses this
 209    when generating traceback tables.  */
 210 /* Not really used for Darwin?  */
 211
 212 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
 213 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 214   fprintf (FILE, "%s", PREFIX)
 215
 216 /* Override the standard rs6000 definition.  */
 217
 218 #undef ASM_COMMENT_START
 219 #define ASM_COMMENT_START ";"
 220
 221 /* This is how to output an assembler line that says to advance
 222    the location counter to a multiple of 2**LOG bytes using the
 223    "nop" instruction as padding.  */
 224
 225 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG)                   \
 226   do                                                          \
 227     {                                                         \
 228       if ((LOG) < 3)                                          \
 229         {                                                     \
 230           ASM_OUTPUT_ALIGN (FILE,LOG);                        \
 231         }                                                     \
 232       else /* nop == ori r0,r0,0 */                           \
 233         fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG));  \
 234     } while (0)
 235
 236 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 237 /* This is supported in cctools 465 and later.  The macro test
 238    above prevents using it in earlier build environments.  */
 239 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)          \
 240   if ((LOG) != 0)                                             \
 241     {                                                         \
 242       if ((MAX_SKIP) == 0)                                    \
 243         fprintf ((FILE), "\t.p2align %d\n", (LOG));           \
 244       else                                                    \
 245         fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
 246     }
 247 #endif
 248
 249 /* Generate insns to call the profiler.  */
 250
 251 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 252
 253 /* Function name to call to do profiling.  */
 254
 255 #define RS6000_MCOUNT "*mcount"
 256
 257 /* Default processor: G4, and G5 for 64-bit.  */
 258
 259 #undef PROCESSOR_DEFAULT
 260 #define PROCESSOR_DEFAULT  PROCESSOR_PPC7400
 261 #undef PROCESSOR_DEFAULT64
 262 #define PROCESSOR_DEFAULT64  PROCESSOR_POWER4
 263
 264 /* Default target flag settings.  Despite the fact that STMW/LMW
 265    serializes, it's still a big code size win to use them.  Use FSEL by
 266    default as well.  */
 267
 268 #undef  TARGET_DEFAULT
 269 #define TARGET_DEFAULT (MASK_MULTIPLE | MASK_PPC_GFXOPT)
 270
 271 /* Darwin always uses IBM long double, never IEEE long double.  */
 272 #undef  TARGET_IEEEQUAD
 273 #define TARGET_IEEEQUAD 0
 274
 275 /* Since Darwin doesn't do TOCs, stub this out.  */
 276
 277 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  ((void)X, (void)MODE, 0)
 278
 279 /* Unlike most other PowerPC targets, chars are signed, for
 280    consistency with other Darwin architectures.  */
 281
 282 #undef DEFAULT_SIGNED_CHAR
 283 #define DEFAULT_SIGNED_CHAR (1)
 284
 285 /* Given an rtx X being reloaded into a reg required to be
 286    in class CLASS, return the class of reg to actually use.
 287    In general this is just CLASS; but on some machines
 288    in some cases it is preferable to use a more restrictive class.
 289
 290    On the RS/6000, we have to return NO_REGS when we want to reload a
 291    floating-point CONST_DOUBLE to force it to be copied to memory.
 292
 293    Don't allow R0 when loading the address of, or otherwise furtling with,
 294    a SYMBOL_REF.  */
 295
 296 #undef PREFERRED_RELOAD_CLASS
 297 #define PREFERRED_RELOAD_CLASS(X,CLASS)                         \
 298   ((CONSTANT_P (X)                                              \
 299     && reg_classes_intersect_p ((CLASS), FLOAT_REGS))           \
 300    ? NO_REGS                                                    \
 301    : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)      \
 302       && reg_class_subset_p (BASE_REGS, (CLASS)))               \
 303    ? BASE_REGS                                                  \
 304    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT                 \
 305       && (CLASS) == NON_SPECIAL_REGS)                           \
 306    ? GENERAL_REGS                                               \
 307    : (CLASS))
 308
 309 /* Compute field alignment.
 310    This implements the 'power' alignment rule by pegging the alignment of
 311    items (beyond the first aggregate field) to 32 bits.  The pegging is
 312    suppressed for vector and long double items (both 128 in size).
 313    There is a dummy use of the FIELD argument to avoid an unused variable
 314    warning (see PR59496).  */
 315 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED)               \
 316   ((void) (FIELD),                                              \
 317     (TARGET_ALIGN_NATURAL                                       \
 318      ? (COMPUTED)                                               \
 319      : (COMPUTED) == 128                                        \
 320         ? 128                                                   \
 321         : MIN ((COMPUTED), 32)))
 322
 323 /* Darwin increases natural record alignment to doubleword if the first
 324    field is an FP double while the FP fields remain word aligned.  */
 325 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                     \
 326   ((TREE_CODE (STRUCT) == RECORD_TYPE                                     \
 327     || TREE_CODE (STRUCT) == UNION_TYPE                                   \
 328     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                             \
 329    && TARGET_ALIGN_NATURAL == 0                                           \
 330    ? darwin_rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
 331    : (TREE_CODE (STRUCT) == VECTOR_TYPE                                   \
 332       && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT)))                        \
 333    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)                             \
 334    : MAX ((COMPUTED), (SPECIFIED)))
 335
 336 /* Specify padding for the last element of a block move between
 337    registers and memory.  FIRST is nonzero if this is the only
 338    element.  */
 339 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 340   (!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE))
 341
 342 #define DOUBLE_INT_ASM_OP "\t.quad\t"
 343
 344 /* For binary compatibility with 2.95; Darwin C APIs use bool from
 345    stdbool.h, which was an int-sized enum in 2.95.  Users can explicitly
 346    choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
 347 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
 348
 349 #undef REGISTER_TARGET_PRAGMAS
 350 #define REGISTER_TARGET_PRAGMAS() \
 351   do \
 352     { \
 353       DARWIN_REGISTER_TARGET_PRAGMAS(); \
 354       targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
 355     } \
 356   while (0)
 357
 358 #ifdef IN_LIBGCC2
 359 #include <stdbool.h>
 360 #endif
 361
 362 /* True, iff we're generating fast turn around debugging code.  When
 363    true, we arrange for function prologues to start with 5 nops so
 364    that gdb may insert code to redirect them, and for data to be
 365    accessed indirectly.  The runtime uses this indirection to forward
 366    references for data to the original instance of that data.  */
 367
 368 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
 369
 370 /* This is the reserved direct dispatch address for Objective-C.  */
 371 #define OFFS_MSGSEND_FAST               0xFFFEFF00
 372
 373 /* This is the reserved ivar address Objective-C.  */
 374 #define OFFS_ASSIGNIVAR_FAST            0xFFFEFEC0
 375
 376 /* Old versions of Mac OS/Darwin don't have C99 functions available.  */
 377 #undef TARGET_LIBC_HAS_FUNCTION
 378 #define TARGET_LIBC_HAS_FUNCTION darwin_libc_has_function
 379
 380 /* When generating kernel code or kexts, we don't use Altivec by
 381    default, as kernel code doesn't save/restore those registers.  */
 382 #define OS_MISSING_ALTIVEC (flag_mkernel || flag_apple_kext)
 383
 384 /* Darwin has support for section anchors on powerpc*.
 385    It is disabled for any section containing a "zero-sized item" (because these
 386    are re-written as size=1 to be compatible with the OSX ld64).
 387    The re-writing would interfere with the computation of anchor offsets.
 388    Therefore, we place zero-sized items in their own sections and make such
 389    sections unavailable to section anchoring.  */
 390
 391 #undef TARGET_ASM_OUTPUT_ANCHOR
 392 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
 393
 394 #undef TARGET_USE_ANCHORS_FOR_SYMBOL_P
 395 #define TARGET_USE_ANCHORS_FOR_SYMBOL_P darwin_use_anchors_for_symbol_p
 396
 397 #undef DARWIN_SECTION_ANCHORS
 398 #define DARWIN_SECTION_ANCHORS 1
 399
 400 /* PPC Darwin has to rename some of the long double builtins.  */
 401 #undef  SUBTARGET_INIT_BUILTINS
 402 #define SUBTARGET_INIT_BUILTINS                                         \
 403 do {                                                                    \
 404   darwin_patch_builtins ();                                             \
 405   rs6000_builtin_decls[(unsigned) (RS6000_BUILTIN_CFSTRING)]            \
 406     = darwin_init_cfstring_builtins ((unsigned) (RS6000_BUILTIN_CFSTRING)); \
 407 } while(0)
 408
 409 /* So far, there is no rs6000_fold_builtin, if one is introduced, then
 410    this will need to be modified similar to the x86 case.  */
 411 #define TARGET_FOLD_BUILTIN SUBTARGET_FOLD_BUILTIN
 412
 413 /* Use standard DWARF numbering for DWARF debugging information.  */
 414 #define RS6000_USE_DWARF_NUMBERING
 415