gcc/config/powerpcspe/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 STARTING_FRAME_OFFSET
 152 #define STARTING_FRAME_OFFSET                                           \
 153   (FRAME_GROWS_DOWNWARD                                                 \
 154    ? 0                                                                  \
 155    : (RS6000_ALIGN (crtl->outgoing_args_size, 16)               \
 156       + RS6000_SAVE_AREA))
 157
 158 #undef STACK_DYNAMIC_OFFSET
 159 #define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
 160   (RS6000_ALIGN (crtl->outgoing_args_size, 16)          \
 161    + (STACK_POINTER_OFFSET))
 162
 163 /* Darwin uses a function call if everything needs to be saved/restored.  */
 164
 165 #undef WORLD_SAVE_P
 166 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
 167
 168 /* We don't use these on Darwin, they are just place-holders.  */
 169 #define SAVE_FP_PREFIX ""
 170 #define SAVE_FP_SUFFIX ""
 171 #define RESTORE_FP_PREFIX ""
 172 #define RESTORE_FP_SUFFIX ""
 173
 174 /* The assembler wants the alternate register names, but without
 175    leading percent sign.  */
 176 #undef REGISTER_NAMES
 177 #define REGISTER_NAMES                                                  \
 178 {                                                                       \
 179      "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",             \
 180      "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",             \
 181     "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",             \
 182     "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",             \
 183      "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",             \
 184      "f8",  "f9", "f10", "f11", "f12", "f13", "f14", "f15",             \
 185     "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",             \
 186     "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",             \
 187      "mq",  "lr", "ctr",  "ap",                                         \
 188     "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",             \
 189     "xer",                                                              \
 190      "v0",  "v1",  "v2",  "v3",  "v4",  "v5",  "v6",  "v7",             \
 191      "v8",  "v9", "v10", "v11", "v12", "v13", "v14", "v15",             \
 192     "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",             \
 193     "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",             \
 194     "vrsave", "vscr",                                                   \
 195     "spe_acc", "spefscr",                                               \
 196     "sfp",                                                              \
 197     "tfhar", "tfiar", "texasr",                                         \
 198     "rh0",  "rh1",  "rh2",  "rh3",  "rh4",  "rh5",  "rh6",  "rh7",      \
 199     "rh8",  "rh9",  "rh10", "rh11", "rh12", "rh13", "rh14", "rh15",     \
 200     "rh16", "rh17", "rh18", "rh19", "rh20", "rh21", "rh22", "rh23",     \
 201     "rh24", "rh25", "rh26", "rh27", "rh28", "rh29", "rh30", "rh31"      \
 202 }
 203
 204 /* This outputs NAME to FILE.  */
 205
 206 #undef  RS6000_OUTPUT_BASENAME
 207 #define RS6000_OUTPUT_BASENAME(FILE, NAME)      \
 208     assemble_name (FILE, NAME)
 209
 210 /* Globalizing directive for a label.  */
 211 #undef GLOBAL_ASM_OP
 212 #define GLOBAL_ASM_OP "\t.globl "
 213 #undef TARGET_ASM_GLOBALIZE_LABEL
 214
 215 /* This is how to output an internal label prefix.  rs6000.c uses this
 216    when generating traceback tables.  */
 217 /* Not really used for Darwin?  */
 218
 219 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
 220 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 221   fprintf (FILE, "%s", PREFIX)
 222
 223 /* Override the standard rs6000 definition.  */
 224
 225 #undef ASM_COMMENT_START
 226 #define ASM_COMMENT_START ";"
 227
 228 /* This is how to output an assembler line that says to advance
 229    the location counter to a multiple of 2**LOG bytes using the
 230    "nop" instruction as padding.  */
 231
 232 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG)                   \
 233   do                                                          \
 234     {                                                         \
 235       if ((LOG) < 3)                                          \
 236         {                                                     \
 237           ASM_OUTPUT_ALIGN (FILE,LOG);                        \
 238         }                                                     \
 239       else /* nop == ori r0,r0,0 */                           \
 240         fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG));  \
 241     } while (0)
 242
 243 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 244 /* This is supported in cctools 465 and later.  The macro test
 245    above prevents using it in earlier build environments.  */
 246 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)          \
 247   if ((LOG) != 0)                                             \
 248     {                                                         \
 249       if ((MAX_SKIP) == 0)                                    \
 250         fprintf ((FILE), "\t.p2align %d\n", (LOG));           \
 251       else                                                    \
 252         fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
 253     }
 254 #endif
 255
 256 /* Generate insns to call the profiler.  */
 257
 258 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 259
 260 /* Function name to call to do profiling.  */
 261
 262 #define RS6000_MCOUNT "*mcount"
 263
 264 /* Default processor: G4, and G5 for 64-bit.  */
 265
 266 #undef PROCESSOR_DEFAULT
 267 #define PROCESSOR_DEFAULT  PROCESSOR_PPC7400
 268 #undef PROCESSOR_DEFAULT64
 269 #define PROCESSOR_DEFAULT64  PROCESSOR_POWER4
 270
 271 /* Default target flag settings.  Despite the fact that STMW/LMW
 272    serializes, it's still a big code size win to use them.  Use FSEL by
 273    default as well.  */
 274
 275 #undef  TARGET_DEFAULT
 276 #define TARGET_DEFAULT (MASK_MULTIPLE | MASK_PPC_GFXOPT)
 277
 278 /* Darwin always uses IBM long double, never IEEE long double.  */
 279 #undef  TARGET_IEEEQUAD
 280 #define TARGET_IEEEQUAD 0
 281
 282 /* Since Darwin doesn't do TOCs, stub this out.  */
 283
 284 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  ((void)X, (void)MODE, 0)
 285
 286 /* Unlike most other PowerPC targets, chars are signed, for
 287    consistency with other Darwin architectures.  */
 288
 289 #undef DEFAULT_SIGNED_CHAR
 290 #define DEFAULT_SIGNED_CHAR (1)
 291
 292 /* Given an rtx X being reloaded into a reg required to be
 293    in class CLASS, return the class of reg to actually use.
 294    In general this is just CLASS; but on some machines
 295    in some cases it is preferable to use a more restrictive class.
 296
 297    On the RS/6000, we have to return NO_REGS when we want to reload a
 298    floating-point CONST_DOUBLE to force it to be copied to memory.
 299
 300    Don't allow R0 when loading the address of, or otherwise furtling with,
 301    a SYMBOL_REF.  */
 302
 303 #undef PREFERRED_RELOAD_CLASS
 304 #define PREFERRED_RELOAD_CLASS(X,CLASS)                         \
 305   ((CONSTANT_P (X)                                              \
 306     && reg_classes_intersect_p ((CLASS), FLOAT_REGS))           \
 307    ? NO_REGS                                                    \
 308    : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)      \
 309       && reg_class_subset_p (BASE_REGS, (CLASS)))               \
 310    ? BASE_REGS                                                  \
 311    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT                 \
 312       && (CLASS) == NON_SPECIAL_REGS)                           \
 313    ? GENERAL_REGS                                               \
 314    : (CLASS))
 315
 316 /* Compute field alignment.
 317    This implements the 'power' alignment rule by pegging the alignment of
 318    items (beyond the first aggregate field) to 32 bits.  The pegging is
 319    suppressed for vector and long double items (both 128 in size).
 320    There is a dummy use of the FIELD argument to avoid an unused variable
 321    warning (see PR59496).  */
 322 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED)               \
 323   ((void) (FIELD),                                              \
 324     (TARGET_ALIGN_NATURAL                                       \
 325      ? (COMPUTED)                                               \
 326      : (COMPUTED) == 128                                        \
 327         ? 128                                                   \
 328         : MIN ((COMPUTED), 32)))
 329
 330 /* Darwin increases natural record alignment to doubleword if the first
 331    field is an FP double while the FP fields remain word aligned.  */
 332 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                     \
 333   ((TREE_CODE (STRUCT) == RECORD_TYPE                                     \
 334     || TREE_CODE (STRUCT) == UNION_TYPE                                   \
 335     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                             \
 336    && TARGET_ALIGN_NATURAL == 0                                           \
 337    ? darwin_rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
 338    : (TREE_CODE (STRUCT) == VECTOR_TYPE                                   \
 339       && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT)))                        \
 340    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)                             \
 341    : MAX ((COMPUTED), (SPECIFIED)))
 342
 343 /* Specify padding for the last element of a block move between
 344    registers and memory.  FIRST is nonzero if this is the only
 345    element.  */
 346 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 347   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 348
 349 #define DOUBLE_INT_ASM_OP "\t.quad\t"
 350
 351 /* For binary compatibility with 2.95; Darwin C APIs use bool from
 352    stdbool.h, which was an int-sized enum in 2.95.  Users can explicitly
 353    choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
 354 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
 355
 356 #undef REGISTER_TARGET_PRAGMAS
 357 #define REGISTER_TARGET_PRAGMAS() \
 358   do \
 359     { \
 360       DARWIN_REGISTER_TARGET_PRAGMAS(); \
 361       targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
 362     } \
 363   while (0)
 364
 365 #ifdef IN_LIBGCC2
 366 #include <stdbool.h>
 367 #endif
 368
 369 /* True, iff we're generating fast turn around debugging code.  When
 370    true, we arrange for function prologues to start with 5 nops so
 371    that gdb may insert code to redirect them, and for data to be
 372    accessed indirectly.  The runtime uses this indirection to forward
 373    references for data to the original instance of that data.  */
 374
 375 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
 376
 377 /* This is the reserved direct dispatch address for Objective-C.  */
 378 #define OFFS_MSGSEND_FAST               0xFFFEFF00
 379
 380 /* This is the reserved ivar address Objective-C.  */
 381 #define OFFS_ASSIGNIVAR_FAST            0xFFFEFEC0
 382
 383 /* Old versions of Mac OS/Darwin don't have C99 functions available.  */
 384 #undef TARGET_LIBC_HAS_FUNCTION
 385 #define TARGET_LIBC_HAS_FUNCTION darwin_libc_has_function
 386
 387 /* When generating kernel code or kexts, we don't use Altivec by
 388    default, as kernel code doesn't save/restore those registers.  */
 389 #define OS_MISSING_ALTIVEC (flag_mkernel || flag_apple_kext)
 390
 391 /* Darwin has support for section anchors on powerpc*.
 392    It is disabled for any section containing a "zero-sized item" (because these
 393    are re-written as size=1 to be compatible with the OSX ld64).
 394    The re-writing would interfere with the computation of anchor offsets.
 395    Therefore, we place zero-sized items in their own sections and make such
 396    sections unavailable to section anchoring.  */
 397
 398 #undef TARGET_ASM_OUTPUT_ANCHOR
 399 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
 400
 401 #undef TARGET_USE_ANCHORS_FOR_SYMBOL_P
 402 #define TARGET_USE_ANCHORS_FOR_SYMBOL_P darwin_use_anchors_for_symbol_p
 403
 404 #undef DARWIN_SECTION_ANCHORS
 405 #define DARWIN_SECTION_ANCHORS 1
 406
 407 /* PPC Darwin has to rename some of the long double builtins.  */
 408 #undef  SUBTARGET_INIT_BUILTINS
 409 #define SUBTARGET_INIT_BUILTINS                                         \
 410 do {                                                                    \
 411   darwin_patch_builtins ();                                             \
 412   rs6000_builtin_decls[(unsigned) (RS6000_BUILTIN_CFSTRING)]            \
 413     = darwin_init_cfstring_builtins ((unsigned) (RS6000_BUILTIN_CFSTRING)); \
 414 } while(0)
 415
 416 /* So far, there is no rs6000_fold_builtin, if one is introduced, then
 417    this will need to be modified similar to the x86 case.  */
 418 #define TARGET_FOLD_BUILTIN SUBTARGET_FOLD_BUILTIN
 419
 420 /* Use standard DWARF numbering for DWARF debugging information.  */
 421 #define RS6000_USE_DWARF_NUMBERING
 422