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 `%s'", 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 %{gused: -g -feliminate-unused-debug-symbols %<gused }\
 130 %{gfull: -g -fno-eliminate-unused-debug-symbols %<gfull }\
 131 %{g: %{!gfull: -feliminate-unused-debug-symbols %<gfull }}\
 132 %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
 133 %{!static:%{!mdynamic-no-pic:-fPIC}}"
 134
 135 /* It's virtually impossible to predict all the possible combinations
 136    of -mcpu and -maltivec and whatnot, so just supply
 137    -force_cpusubtype_ALL if any are seen.  Radar 3492132 against the
 138    assembler is asking for a .machine directive so we could get this
 139    really right.  */
 140 #define ASM_SPEC "-arch ppc \
 141   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL} \
 142   %{!Zforce_cpusubtype_ALL:%{maltivec|mcpu=*|mpowerpc64:-force_cpusubtype_ALL}}"
 143
 144 #undef SUBTARGET_EXTRA_SPECS
 145 #define SUBTARGET_EXTRA_SPECS                   \
 146   { "darwin_arch", "ppc" },
 147
 148 /* The "-faltivec" option should have been called "-maltivec" all
 149    along.  -ffix-and-continue and -findirect-data is for compatibility
 150    for old compilers.  */
 151
 152 #define SUBTARGET_OPTION_TRANSLATE_TABLE                                \
 153   { "-ffix-and-continue", "-mfix-and-continue" },                       \
 154   { "-findirect-data", "-mfix-and-continue" },                          \
 155   { "-faltivec", "-maltivec -include altivec.h" },                      \
 156   { "-fno-altivec", "-mno-altivec" },                                   \
 157   { "-Waltivec-long-deprecated",        "-mwarn-altivec-long" },        \
 158   { "-Wno-altivec-long-deprecated", "-mno-warn-altivec-long" }
 159
 160 /* Make both r2 and r3 available for allocation.  */
 161 #define FIXED_R2 0
 162 #define FIXED_R13 0
 163
 164 /* Base register for access to local variables of the function.  */
 165
 166 #undef  FRAME_POINTER_REGNUM
 167 #define FRAME_POINTER_REGNUM 30
 168
 169 #undef  RS6000_PIC_OFFSET_TABLE_REGNUM
 170 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
 171
 172 /* Pad the outgoing args area to 16 bytes instead of the usual 8.  */
 173
 174 #undef STARTING_FRAME_OFFSET
 175 #define STARTING_FRAME_OFFSET                                           \
 176   (RS6000_ALIGN (current_function_outgoing_args_size, 16)               \
 177    + RS6000_VARARGS_AREA                                                \
 178    + RS6000_SAVE_AREA)
 179
 180 #undef STACK_DYNAMIC_OFFSET
 181 #define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
 182   (RS6000_ALIGN (current_function_outgoing_args_size, 16)               \
 183    + (STACK_POINTER_OFFSET))
 184
 185 /* These are used by -fbranch-probabilities */
 186 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
 187 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
 188                               "__TEXT,__unlikely,regular,pure_instructions"
 189
 190 /* Define cutoff for using external functions to save floating point.
 191    Currently on Darwin, always use inline stores.  */
 192
 193 #undef  FP_SAVE_INLINE
 194 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
 195
 196 /* The assembler wants the alternate register names, but without
 197    leading percent sign.  */
 198 #undef REGISTER_NAMES
 199 #define REGISTER_NAMES                                                  \
 200 {                                                                       \
 201      "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",             \
 202      "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",             \
 203     "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",             \
 204     "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",             \
 205      "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",             \
 206      "f8",  "f9", "f10", "f11", "f12", "f13", "f14", "f15",             \
 207     "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",             \
 208     "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",             \
 209      "mq",  "lr", "ctr",  "ap",                                         \
 210     "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",             \
 211     "xer",                                                              \
 212      "v0",  "v1",  "v2",  "v3",  "v4",  "v5",  "v6",  "v7",             \
 213      "v8",  "v9", "v10", "v11", "v12", "v13", "v14", "v15",             \
 214     "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",             \
 215     "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",             \
 216     "vrsave", "vscr",                                                   \
 217     "spe_acc", "spefscr"                                                \
 218 }
 219
 220 /* This outputs NAME to FILE.  */
 221
 222 #undef  RS6000_OUTPUT_BASENAME
 223 #define RS6000_OUTPUT_BASENAME(FILE, NAME)      \
 224     assemble_name (FILE, NAME)
 225
 226 /* Globalizing directive for a label.  */
 227 #undef GLOBAL_ASM_OP
 228 #define GLOBAL_ASM_OP "\t.globl "
 229 #undef TARGET_ASM_GLOBALIZE_LABEL
 230
 231 /* This is how to output an internal label prefix.  rs6000.c uses this
 232    when generating traceback tables.  */
 233 /* Not really used for Darwin?  */
 234
 235 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
 236 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 237   fprintf (FILE, "%s", PREFIX)
 238
 239 /* This says how to output an assembler line to define a global common
 240    symbol.  */
 241 /* ? */
 242 #undef  ASM_OUTPUT_ALIGNED_COMMON
 243 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)    \
 244   do { fputs (".comm ", (FILE));                        \
 245        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 246        fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n",\
 247                 (SIZE)); } while (0)
 248
 249 /* Override the standard rs6000 definition.  */
 250
 251 #undef ASM_COMMENT_START
 252 #define ASM_COMMENT_START ";"
 253
 254 /* FP save and restore routines.  */
 255 #define SAVE_FP_PREFIX "._savef"
 256 #define SAVE_FP_SUFFIX ""
 257 #define RESTORE_FP_PREFIX "._restf"
 258 #define RESTORE_FP_SUFFIX ""
 259
 260 /* This is how to output an assembler line that says to advance
 261    the location counter to a multiple of 2**LOG bytes using the
 262    "nop" instruction as padding.  */
 263
 264 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG)                   \
 265   do                                                          \
 266     {                                                         \
 267       if ((LOG) < 3)                                          \
 268         {                                                     \
 269           ASM_OUTPUT_ALIGN (FILE,LOG);                        \
 270         }                                                     \
 271       else /* nop == ori r0,r0,0 */                           \
 272         fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG));  \
 273     } while (0)
 274
 275 /* Generate insns to call the profiler.  */
 276
 277 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 278
 279 /* Function name to call to do profiling.  */
 280
 281 #define RS6000_MCOUNT "*mcount"
 282
 283 /* Default processor: G4, and G5 for 64-bit.  */
 284
 285 #undef PROCESSOR_DEFAULT
 286 #define PROCESSOR_DEFAULT  PROCESSOR_PPC7400
 287 #undef PROCESSOR_DEFAULT64
 288 #define PROCESSOR_DEFAULT64  PROCESSOR_POWER4
 289
 290 /* Default target flag settings.  Despite the fact that STMW/LMW
 291    serializes, it's still a big code size win to use them.  Use FSEL by
 292    default as well.  */
 293
 294 #undef  TARGET_DEFAULT
 295 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
 296                       | MASK_PPC_GFXOPT)
 297
 298 /* Since Darwin doesn't do TOCs, stub this out.  */
 299
 300 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  0
 301
 302 /* Unlike most other PowerPC targets, chars are signed, for
 303    consistency with other Darwin architectures.  */
 304
 305 #undef DEFAULT_SIGNED_CHAR
 306 #define DEFAULT_SIGNED_CHAR (1)
 307
 308 /* Given an rtx X being reloaded into a reg required to be
 309    in class CLASS, return the class of reg to actually use.
 310    In general this is just CLASS; but on some machines
 311    in some cases it is preferable to use a more restrictive class.
 312
 313    On the RS/6000, we have to return NO_REGS when we want to reload a
 314    floating-point CONST_DOUBLE to force it to be copied to memory.
 315
 316    Don't allow R0 when loading the address of, or otherwise furtling with,
 317    a SYMBOL_REF.  */
 318
 319 #undef PREFERRED_RELOAD_CLASS
 320 #define PREFERRED_RELOAD_CLASS(X,CLASS)                         \
 321   ((GET_CODE (X) == CONST_DOUBLE                                \
 322     && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT)             \
 323    ? NO_REGS                                                    \
 324    : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)      \
 325       && reg_class_subset_p (BASE_REGS, (CLASS)))               \
 326    ? BASE_REGS                                                  \
 327    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT                 \
 328       && (CLASS) == NON_SPECIAL_REGS)                           \
 329    ? GENERAL_REGS                                               \
 330    : (CLASS))
 331
 332 /* Fix for emit_group_load (): force large constants to be pushed via regs.  */
 333 #define ALWAYS_PUSH_CONSTS_USING_REGS_P         1
 334
 335 /* This now supports a natural alignment mode */
 336 /* Darwin word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
 337 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 338   (TARGET_ALIGN_NATURAL ? (COMPUTED) : \
 339   (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
 340               ? get_inner_array_type (FIELD) \
 341               : TREE_TYPE (FIELD)) == DFmode \
 342    ? MIN ((COMPUTED), 32) : (COMPUTED)))
 343
 344 /* Darwin increases natural record alignment to doubleword if the first
 345    field is an FP double while the FP fields remain word aligned.  */
 346 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 347   ((TREE_CODE (STRUCT) == RECORD_TYPE                                   \
 348     || TREE_CODE (STRUCT) == UNION_TYPE                                 \
 349     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                           \
 350    && TARGET_ALIGN_NATURAL == 0                                         \
 351    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 352    : (TREE_CODE (STRUCT) == VECTOR_TYPE                                 \
 353       && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT)))                      \
 354    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)                            \
 355    : MAX ((COMPUTED), (SPECIFIED)))
 356
 357 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
 358    support 64 bit PowerPC either, so this just keeps things happy.  */
 359 #define DOUBLE_INT_ASM_OP "\t.quad\t"
 360
 361 /* For binary compatibility with 2.95; Darwin C APIs use bool from
 362    stdbool.h, which was an int-sized enum in 2.95.  Users can explicitly
 363    choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
 364 extern const char *darwin_one_byte_bool;
 365 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
 366
 367 #undef REGISTER_TARGET_PRAGMAS
 368 #define REGISTER_TARGET_PRAGMAS DARWIN_REGISTER_TARGET_PRAGMAS
 369
 370 #ifdef IN_LIBGCC2
 371 #include <stdbool.h>
 372 #endif
 373
 374 #define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS)               \
 375   {                                                                     \
 376     extern bool _Unwind_fallback_frame_state_for                        \
 377       (struct _Unwind_Context *context, _Unwind_FrameState *fs);        \
 378                                                                         \
 379     if (_Unwind_fallback_frame_state_for (CONTEXT, FS))                 \
 380       goto SUCCESS;                                                     \
 381   }
 382
 383 #define HAS_MD_FALLBACK_FRAME_STATE_FOR 1
 384
 385 /* True, iff we're generating fast turn around debugging code.  When
 386    true, we arrange for function prologues to start with 4 nops so
 387    that gdb may insert code to redirect them, and for data to accessed
 388    indirectly.  The runtime uses this indirection to forward
 389    references for data to the original instance of that data.  */
 390
 391 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)