gcc/config/rs6000/darwin.h

   1 /* Target definitions for PowerPC running Darwin (Mac OS X).
   2    Copyright (C) 1997, 2000, 2001, 2003, 2004 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 2, 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 COPYING.  If not, write to the
  19    Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  20    MA 02111-1307, USA.  */
  21
  22 #undef  TARGET_VERSION
  23 #define TARGET_VERSION fprintf (stderr, " (Darwin/PowerPC)");
  24
  25 /* The "Darwin ABI" is mostly like AIX, but with some key differences.  */
  26
  27 #define DEFAULT_ABI ABI_DARWIN
  28
  29 /* The object file format is Mach-O.  */
  30
  31 #define TARGET_OBJECT_FORMAT OBJECT_MACHO
  32
  33 /* We're not ever going to do TOCs.  */
  34
  35 #define TARGET_TOC 0
  36 #define TARGET_NO_TOC 1
  37
  38 /* Override the default rs6000 definition.  */
  39 #undef  PTRDIFF_TYPE
  40 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
  41
  42 /* Darwin switches.  */
  43 /* Use dynamic-no-pic codegen (no picbase reg; not suitable for shlibs.)  */
  44 #define MASK_MACHO_DYNAMIC_NO_PIC 0x00800000
  45
  46 #define TARGET_DYNAMIC_NO_PIC   (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
  47
  48 /* Handle #pragma weak and #pragma pack.  */
  49 #define HANDLE_SYSV_PRAGMA 1
  50
  51
  52 #define TARGET_OS_CPP_BUILTINS()                \
  53   do                                            \
  54     {                                           \
  55       if (!TARGET_64BIT) builtin_define ("__ppc__");   \
  56       if (TARGET_64BIT) builtin_define ("__ppc64__");  \
  57       builtin_define ("__POWERPC__");           \
  58       builtin_define ("__NATURAL_ALIGNMENT__"); \
  59       builtin_define ("__MACH__");              \
  60       builtin_define ("__APPLE__");             \
  61     }                                           \
  62   while (0)
  63
  64
  65 /*  */
  66 #undef  SUBTARGET_SWITCHES
  67 #define SUBTARGET_SWITCHES                                              \
  68   { "64",     MASK_64BIT | MASK_POWERPC64, \
  69         N_("Generate 64-bit code") }, \
  70   { "32",     - (MASK_64BIT | MASK_POWERPC64), \
  71         N_("Generate 32-bit code") }, \
  72   {"dynamic-no-pic",    MASK_MACHO_DYNAMIC_NO_PIC,                      \
  73       N_("Generate code suitable for executables (NOT shared libs)")},  \
  74   {"no-dynamic-no-pic", -MASK_MACHO_DYNAMIC_NO_PIC, ""},
  75
  76
  77 /* The Darwin ABI always includes AltiVec, can't be (validly) turned
  78    off.  */
  79
  80 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
  81 do {                                                                    \
  82   rs6000_altivec_abi = 1;                                               \
  83   rs6000_altivec_vrsave = 1;                                            \
  84   if (DEFAULT_ABI == ABI_DARWIN)                                        \
  85   {                                                                     \
  86     if (MACHO_DYNAMIC_NO_PIC_P)                                         \
  87       {                                                                 \
  88         if (flag_pic)                                                   \
  89             warning ("-mdynamic-no-pic overrides -fpic or -fPIC");      \
  90         flag_pic = 0;                                                   \
  91       }                                                                 \
  92     else if (flag_pic == 1)                                             \
  93       {                                                                 \
  94         /* Darwin doesn't support -fpic.  */                            \
  95         warning ("-fpic is not supported; -fPIC assumed");              \
  96         flag_pic = 2;                                                   \
  97       }                                                                 \
  98                                                                         \
  99     /* Handle -mfix-and-continue.  */                                   \
 100     if (darwin_fix_and_continue_switch)                                 \
 101       {                                                                 \
 102         const char *base = darwin_fix_and_continue_switch;              \
 103         while (base[-1] != 'm') base--;                                 \
 104                                                                         \
 105         if (*darwin_fix_and_continue_switch != '\0')                    \
 106           error ("invalid option %qs", base);                           \
 107         darwin_fix_and_continue = (base[0] != 'n');                     \
 108       }                                                                 \
 109   }                                                                     \
 110   if (TARGET_64BIT && ! TARGET_POWERPC64)                               \
 111     {                                                                   \
 112       target_flags |= MASK_POWERPC64;                                   \
 113       warning ("-m64 requires PowerPC64 architecture, enabling");       \
 114     }                                                                   \
 115 } while(0)
 116
 117 /* Darwin has 128-bit long double support in libc in 10.4 and later.
 118    Default to 128-bit long doubles even on earlier platforms for ABI
 119    consistency; arithmetic will work even if libc and libm support is
 120    not available.  */
 121
 122 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 123
 124
 125 /* We want -fPIC by default, unless we're using -static to compile for
 126    the kernel or some such.  */
 127
 128 #define CC1_SPEC "\
 129 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
 130 %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
 131 %{!static:%{!mdynamic-no-pic:-fPIC}}"
 132
 133 #define DARWIN_SUBARCH_SPEC "                   \
 134  %{m64: ppc64}                                  \
 135  %{!m64:                                        \
 136  %{mcpu=601:ppc601;                             \
 137    mcpu=603:ppc603;                             \
 138    mcpu=603e:ppc603;                            \
 139    mcpu=604:ppc604;                             \
 140    mcpu=604e:ppc604e;                           \
 141    mcpu=740:ppc750;                             \
 142    mcpu=750:ppc750;                             \
 143    mcpu=G3:ppc750;                              \
 144    mcpu=7400:ppc7400;                           \
 145    mcpu=G4:ppc7400;                             \
 146    mcpu=7450:ppc7450;                           \
 147    mcpu=970:ppc970;                             \
 148    mcpu=power4:ppc970;                          \
 149    mcpu=G5:ppc970;                              \
 150    :ppc}}"
 151
 152 #undef SUBTARGET_EXTRA_SPECS
 153 #define SUBTARGET_EXTRA_SPECS                   \
 154   { "darwin_arch", "%{m64:ppc64;:ppc}" },       \
 155   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 156
 157 /* Output a .machine directive.  */
 158 #undef TARGET_ASM_FILE_START
 159 #define TARGET_ASM_FILE_START rs6000_darwin_file_start
 160
 161 /* The "-faltivec" option should have been called "-maltivec" all
 162    along.  -ffix-and-continue and -findirect-data is for compatibility
 163    for old compilers.  */
 164
 165 #define SUBTARGET_OPTION_TRANSLATE_TABLE                                \
 166   { "-ffix-and-continue", "-mfix-and-continue" },                       \
 167   { "-findirect-data", "-mfix-and-continue" },                          \
 168   { "-faltivec", "-maltivec -include altivec.h" },                      \
 169   { "-fno-altivec", "-mno-altivec" },                                   \
 170   { "-Waltivec-long-deprecated",        "-mwarn-altivec-long" },        \
 171   { "-Wno-altivec-long-deprecated", "-mno-warn-altivec-long" }
 172
 173 /* Make both r2 and r13 available for allocation.  */
 174 #define FIXED_R2 0
 175 #define FIXED_R13 0
 176
 177 /* Base register for access to local variables of the function.  */
 178
 179 #undef  FRAME_POINTER_REGNUM
 180 #define FRAME_POINTER_REGNUM 30
 181
 182 #undef  RS6000_PIC_OFFSET_TABLE_REGNUM
 183 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
 184
 185 /* Pad the outgoing args area to 16 bytes instead of the usual 8.  */
 186
 187 #undef STARTING_FRAME_OFFSET
 188 #define STARTING_FRAME_OFFSET                                           \
 189   (RS6000_ALIGN (current_function_outgoing_args_size, 16)               \
 190    + RS6000_VARARGS_AREA                                                \
 191    + RS6000_SAVE_AREA)
 192
 193 #undef STACK_DYNAMIC_OFFSET
 194 #define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
 195   (RS6000_ALIGN (current_function_outgoing_args_size, 16)               \
 196    + (STACK_POINTER_OFFSET))
 197
 198 /* These are used by -fbranch-probabilities */
 199 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
 200 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
 201                               "__TEXT,__unlikely,regular,pure_instructions"
 202
 203 /* Define cutoff for using external functions to save floating point.
 204    Currently on Darwin, always use inline stores.  */
 205
 206 #undef  FP_SAVE_INLINE
 207 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
 208
 209 /* Darwin uses a function call if everything needs to be saved/restored.  */
 210 #undef WORLD_SAVE_P
 211 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
 212
 213 /* The assembler wants the alternate register names, but without
 214    leading percent sign.  */
 215 #undef REGISTER_NAMES
 216 #define REGISTER_NAMES                                                  \
 217 {                                                                       \
 218      "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",             \
 219      "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",             \
 220     "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",             \
 221     "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",             \
 222      "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",             \
 223      "f8",  "f9", "f10", "f11", "f12", "f13", "f14", "f15",             \
 224     "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",             \
 225     "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",             \
 226      "mq",  "lr", "ctr",  "ap",                                         \
 227     "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",             \
 228     "xer",                                                              \
 229      "v0",  "v1",  "v2",  "v3",  "v4",  "v5",  "v6",  "v7",             \
 230      "v8",  "v9", "v10", "v11", "v12", "v13", "v14", "v15",             \
 231     "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",             \
 232     "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",             \
 233     "vrsave", "vscr",                                                   \
 234     "spe_acc", "spefscr"                                                \
 235 }
 236
 237 /* This outputs NAME to FILE.  */
 238
 239 #undef  RS6000_OUTPUT_BASENAME
 240 #define RS6000_OUTPUT_BASENAME(FILE, NAME)      \
 241     assemble_name (FILE, NAME)
 242
 243 /* Globalizing directive for a label.  */
 244 #undef GLOBAL_ASM_OP
 245 #define GLOBAL_ASM_OP "\t.globl "
 246 #undef TARGET_ASM_GLOBALIZE_LABEL
 247
 248 /* This is how to output an internal label prefix.  rs6000.c uses this
 249    when generating traceback tables.  */
 250 /* Not really used for Darwin?  */
 251
 252 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
 253 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 254   fprintf (FILE, "%s", PREFIX)
 255
 256 /* This says how to output an assembler line to define a global common
 257    symbol.  */
 258 /* ? */
 259 #undef  ASM_OUTPUT_ALIGNED_COMMON
 260 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)                    \
 261   do {                                                                  \
 262     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
 263     fputs (".comm ", (FILE));                                           \
 264     RS6000_OUTPUT_BASENAME ((FILE), (NAME));                            \
 265     if (_new_size == 0) _new_size = 1;                                  \
 266     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", _new_size);   \
 267   } while (0)
 268
 269 /* Override the standard rs6000 definition.  */
 270
 271 #undef ASM_COMMENT_START
 272 #define ASM_COMMENT_START ";"
 273
 274 /* FP save and restore routines.  */
 275 #define SAVE_FP_PREFIX "._savef"
 276 #define SAVE_FP_SUFFIX ""
 277 #define RESTORE_FP_PREFIX "._restf"
 278 #define RESTORE_FP_SUFFIX ""
 279
 280 /* This is how to output an assembler line that says to advance
 281    the location counter to a multiple of 2**LOG bytes using the
 282    "nop" instruction as padding.  */
 283
 284 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG)                   \
 285   do                                                          \
 286     {                                                         \
 287       if ((LOG) < 3)                                          \
 288         {                                                     \
 289           ASM_OUTPUT_ALIGN (FILE,LOG);                        \
 290         }                                                     \
 291       else /* nop == ori r0,r0,0 */                           \
 292         fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG));  \
 293     } while (0)
 294
 295 /* Generate insns to call the profiler.  */
 296
 297 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 298
 299 /* Function name to call to do profiling.  */
 300
 301 #define RS6000_MCOUNT "*mcount"
 302
 303 /* Default processor: G4, and G5 for 64-bit.  */
 304
 305 #undef PROCESSOR_DEFAULT
 306 #define PROCESSOR_DEFAULT  PROCESSOR_PPC7400
 307 #undef PROCESSOR_DEFAULT64
 308 #define PROCESSOR_DEFAULT64  PROCESSOR_POWER4
 309
 310 /* Default target flag settings.  Despite the fact that STMW/LMW
 311    serializes, it's still a big code size win to use them.  Use FSEL by
 312    default as well.  */
 313
 314 #undef  TARGET_DEFAULT
 315 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
 316                       | MASK_PPC_GFXOPT)
 317
 318 /* Darwin only runs on PowerPC, so short-circuit POWER patterns.  */
 319 #undef  TARGET_POWER
 320 #define TARGET_POWER 0
 321
 322 /* Since Darwin doesn't do TOCs, stub this out.  */
 323
 324 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  0
 325
 326 /* Unlike most other PowerPC targets, chars are signed, for
 327    consistency with other Darwin architectures.  */
 328
 329 #undef DEFAULT_SIGNED_CHAR
 330 #define DEFAULT_SIGNED_CHAR (1)
 331
 332 /* Given an rtx X being reloaded into a reg required to be
 333    in class CLASS, return the class of reg to actually use.
 334    In general this is just CLASS; but on some machines
 335    in some cases it is preferable to use a more restrictive class.
 336
 337    On the RS/6000, we have to return NO_REGS when we want to reload a
 338    floating-point CONST_DOUBLE to force it to be copied to memory.
 339
 340    Don't allow R0 when loading the address of, or otherwise furtling with,
 341    a SYMBOL_REF.  */
 342
 343 #undef PREFERRED_RELOAD_CLASS
 344 #define PREFERRED_RELOAD_CLASS(X,CLASS)                         \
 345   ((CONSTANT_P (X)                                              \
 346     && reg_classes_intersect_p ((CLASS), FLOAT_REGS))           \
 347    ? NO_REGS                                                    \
 348    : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)      \
 349       && reg_class_subset_p (BASE_REGS, (CLASS)))               \
 350    ? BASE_REGS                                                  \
 351    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT                 \
 352       && (CLASS) == NON_SPECIAL_REGS)                           \
 353    ? GENERAL_REGS                                               \
 354    : (CLASS))
 355
 356 /* Fix for emit_group_load (): force large constants to be pushed via regs.  */
 357 #define ALWAYS_PUSH_CONSTS_USING_REGS_P         1
 358
 359 /* This now supports a natural alignment mode */
 360 /* Darwin word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
 361 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 362   (TARGET_ALIGN_NATURAL ? (COMPUTED) : \
 363   (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
 364               ? get_inner_array_type (FIELD) \
 365               : TREE_TYPE (FIELD)) == DFmode \
 366    ? MIN ((COMPUTED), 32) : (COMPUTED)))
 367
 368 /* Darwin increases natural record alignment to doubleword if the first
 369    field is an FP double while the FP fields remain word aligned.  */
 370 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 371   ((TREE_CODE (STRUCT) == RECORD_TYPE                                   \
 372     || TREE_CODE (STRUCT) == UNION_TYPE                                 \
 373     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                           \
 374    && TARGET_ALIGN_NATURAL == 0                                         \
 375    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 376    : (TREE_CODE (STRUCT) == VECTOR_TYPE                                 \
 377       && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT)))                      \
 378    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)                            \
 379    : MAX ((COMPUTED), (SPECIFIED)))
 380
 381 /* Specify padding for the last element of a block move between
 382    registers and memory.  FIRST is nonzero if this is the only
 383    element.  */
 384 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 385   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 386
 387 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
 388    support 64 bit PowerPC either, so this just keeps things happy.  */
 389 #define DOUBLE_INT_ASM_OP "\t.quad\t"
 390
 391 /* For binary compatibility with 2.95; Darwin C APIs use bool from
 392    stdbool.h, which was an int-sized enum in 2.95.  Users can explicitly
 393    choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
 394 extern const char *darwin_one_byte_bool;
 395 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
 396
 397 #undef REGISTER_TARGET_PRAGMAS
 398 #define REGISTER_TARGET_PRAGMAS DARWIN_REGISTER_TARGET_PRAGMAS
 399
 400 #ifdef IN_LIBGCC2
 401 #include <stdbool.h>
 402 #endif
 403
 404 #define MD_UNWIND_SUPPORT "config/rs6000/darwin-unwind.h"
 405
 406 #define HAS_MD_FALLBACK_FRAME_STATE_FOR 1
 407
 408 /* True, iff we're generating fast turn around debugging code.  When
 409    true, we arrange for function prologues to start with 4 nops so
 410    that gdb may insert code to redirect them, and for data to accessed
 411    indirectly.  The runtime uses this indirection to forward
 412    references for data to the original instance of that data.  */
 413
 414 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)