gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000-2013 Free Software Foundation, 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    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 #ifndef RS6000_BI_ARCH
  27
  28 #undef  DEFAULT_ABI
  29 #define DEFAULT_ABI ABI_AIX
  30
  31 #undef  TARGET_64BIT
  32 #define TARGET_64BIT 1
  33
  34 #define DEFAULT_ARCH64_P 1
  35 #define RS6000_BI_ARCH_P 0
  36
  37 #else
  38
  39 #define DEFAULT_ARCH64_P (TARGET_DEFAULT & MASK_64BIT)
  40 #define RS6000_BI_ARCH_P 1
  41
  42 #endif
  43
  44 #ifdef IN_LIBGCC2
  45 #undef TARGET_64BIT
  46 #ifdef __powerpc64__
  47 #define TARGET_64BIT 1
  48 #else
  49 #define TARGET_64BIT 0
  50 #endif
  51 #endif
  52
  53 #undef  TARGET_AIX
  54 #define TARGET_AIX TARGET_64BIT
  55
  56 #ifdef HAVE_LD_NO_DOT_SYMS
  57 /* New ABI uses a local sym for the function entry point.  */
  58 extern int dot_symbols;
  59 #undef DOT_SYMBOLS
  60 #define DOT_SYMBOLS dot_symbols
  61 #endif
  62
  63 #define TARGET_PROFILE_KERNEL profile_kernel
  64
  65 #define TARGET_USES_LINUX64_OPT 1
  66 #ifdef HAVE_LD_LARGE_TOC
  67 #undef TARGET_CMODEL
  68 #define TARGET_CMODEL rs6000_current_cmodel
  69 #define SET_CMODEL(opt) rs6000_current_cmodel = opt
  70 #else
  71 #define SET_CMODEL(opt) do {} while (0)
  72 #endif
  73
  74 #undef  PROCESSOR_DEFAULT
  75 #define PROCESSOR_DEFAULT PROCESSOR_POWER7
  76 #undef  PROCESSOR_DEFAULT64
  77 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER7
  78
  79 /* We don't need to generate entries in .fixup, except when
  80    -mrelocatable or -mrelocatable-lib is given.  */
  81 #undef RELOCATABLE_NEEDS_FIXUP
  82 #define RELOCATABLE_NEEDS_FIXUP \
  83   (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
  84
  85 #undef  RS6000_ABI_NAME
  86 #define RS6000_ABI_NAME "linux"
  87
  88 #define INVALID_64BIT "-m%s not supported in this configuration"
  89 #define INVALID_32BIT INVALID_64BIT
  90
  91 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  92 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  93   do                                                            \
  94     {                                                           \
  95       if (!global_options_set.x_rs6000_alignment_flags)         \
  96         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  97       if (TARGET_64BIT)                                         \
  98         {                                                       \
  99           if (DEFAULT_ABI != ABI_AIX)                           \
 100             {                                                   \
 101               rs6000_current_abi = ABI_AIX;                     \
 102               error (INVALID_64BIT, "call");                    \
 103             }                                                   \
 104           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
 105           if (rs6000_isa_flags & OPTION_MASK_RELOCATABLE)       \
 106             {                                                   \
 107               rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE;     \
 108               error (INVALID_64BIT, "relocatable");             \
 109             }                                                   \
 110           if (rs6000_isa_flags & OPTION_MASK_EABI)              \
 111             {                                                   \
 112               rs6000_isa_flags &= ~OPTION_MASK_EABI;            \
 113               error (INVALID_64BIT, "eabi");                    \
 114             }                                                   \
 115           if (TARGET_PROTOTYPE)                                 \
 116             {                                                   \
 117               target_prototype = 0;                             \
 118               error (INVALID_64BIT, "prototype");               \
 119             }                                                   \
 120           if ((rs6000_isa_flags & OPTION_MASK_POWERPC64) == 0)  \
 121             {                                                   \
 122               rs6000_isa_flags |= OPTION_MASK_POWERPC64;        \
 123               error ("-m64 requires a PowerPC64 cpu");          \
 124             }                                                   \
 125           if ((rs6000_isa_flags_explicit                        \
 126                & OPTION_MASK_MINIMAL_TOC) != 0)                 \
 127             {                                                   \
 128               if (global_options_set.x_rs6000_current_cmodel    \
 129                   && rs6000_current_cmodel != CMODEL_SMALL)     \
 130                 error ("-mcmodel incompatible with other toc options"); \
 131               SET_CMODEL (CMODEL_SMALL);                        \
 132             }                                                   \
 133           else                                                  \
 134             {                                                   \
 135               if (!global_options_set.x_rs6000_current_cmodel)  \
 136                 SET_CMODEL (CMODEL_MEDIUM);                     \
 137               if (rs6000_current_cmodel != CMODEL_SMALL)        \
 138                 {                                               \
 139                   if (!global_options_set.x_TARGET_NO_FP_IN_TOC) \
 140                     TARGET_NO_FP_IN_TOC                         \
 141                       = rs6000_current_cmodel == CMODEL_MEDIUM; \
 142                   if (!global_options_set.x_TARGET_NO_SUM_IN_TOC) \
 143                     TARGET_NO_SUM_IN_TOC = 0;                   \
 144                 }                                               \
 145             }                                                   \
 146         }                                                       \
 147       else                                                      \
 148         {                                                       \
 149           if (!RS6000_BI_ARCH_P)                                \
 150             error (INVALID_32BIT, "32");                        \
 151           if (TARGET_PROFILE_KERNEL)                            \
 152             {                                                   \
 153               TARGET_PROFILE_KERNEL = 0;                        \
 154               error (INVALID_32BIT, "profile-kernel");          \
 155             }                                                   \
 156           if (global_options_set.x_rs6000_current_cmodel)       \
 157             {                                                   \
 158               SET_CMODEL (CMODEL_SMALL);                        \
 159               error (INVALID_32BIT, "cmodel");                  \
 160             }                                                   \
 161         }                                                       \
 162     }                                                           \
 163   while (0)
 164
 165 #undef  ASM_DEFAULT_SPEC
 166 #undef  ASM_SPEC
 167 #undef  LINK_OS_LINUX_SPEC
 168
 169 #ifndef RS6000_BI_ARCH
 170 #define ASM_DEFAULT_SPEC "-mppc64"
 171 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 172 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 173 #else
 174 #if DEFAULT_ARCH64_P
 175 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 176 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 177 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 178 #else
 179 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 180 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 181 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 182 #endif
 183 #endif
 184
 185 #define ASM_SPEC32 "-a32 \
 186 %{mrelocatable} %{mrelocatable-lib} %{fpic|fpie|fPIC|fPIE:-K PIC} \
 187 %{memb|msdata=eabi: -memb}"
 188
 189 #define ASM_SPEC64 "-a64"
 190
 191 #define ASM_SPEC_COMMON "%(asm_cpu) \
 192 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
 193   ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
 194
 195 #undef  SUBSUBTARGET_EXTRA_SPECS
 196 #define SUBSUBTARGET_EXTRA_SPECS \
 197   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 198   { "asm_spec32",               ASM_SPEC32 },                           \
 199   { "asm_spec64",               ASM_SPEC64 },                           \
 200   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 201   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 202
 203 #undef  MULTILIB_DEFAULTS
 204 #if DEFAULT_ARCH64_P
 205 #define MULTILIB_DEFAULTS { "m64" }
 206 #else
 207 #define MULTILIB_DEFAULTS { "m32" }
 208 #endif
 209
 210 #ifndef RS6000_BI_ARCH
 211
 212 /* 64-bit PowerPC Linux always has a TOC.  */
 213 #undef  TARGET_TOC
 214 #define TARGET_TOC              1
 215
 216 /* Some things from sysv4.h we don't do when 64 bit.  */
 217 #undef  OPTION_RELOCATABLE
 218 #define OPTION_RELOCATABLE      0
 219 #undef  OPTION_EABI
 220 #define OPTION_EABI             0
 221 #undef  OPTION_PROTOTYPE
 222 #define OPTION_PROTOTYPE        0
 223 #undef RELOCATABLE_NEEDS_FIXUP
 224 #define RELOCATABLE_NEEDS_FIXUP 0
 225
 226 #endif
 227
 228 /* We use glibc _mcount for profiling.  */
 229 #define NO_PROFILE_COUNTERS 1
 230 #define PROFILE_HOOK(LABEL) \
 231   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 232
 233 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 234 #undef  ADJUST_FIELD_ALIGN
 235 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 236   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 237    ? 128                                                                \
 238    : (TARGET_64BIT                                                      \
 239       && TARGET_ALIGN_NATURAL == 0                                      \
 240       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 241    ? MIN ((COMPUTED), 32)                                               \
 242    : (COMPUTED))
 243
 244 /* PowerPC64 Linux increases natural record alignment to doubleword if
 245    the first field is an FP double, only if in power alignment mode.  */
 246 #undef  ROUND_TYPE_ALIGN
 247 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 248   ((TARGET_64BIT                                                        \
 249     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 250         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 251         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 252     && TARGET_ALIGN_NATURAL == 0)                                       \
 253    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 254    : MAX ((COMPUTED), (SPECIFIED)))
 255
 256 /* Use the default for compiling target libs.  */
 257 #ifdef IN_TARGET_LIBS
 258 #undef TARGET_ALIGN_NATURAL
 259 #define TARGET_ALIGN_NATURAL 1
 260 #endif
 261
 262 /* Indicate that jump tables go in the text section.  */
 263 #undef  JUMP_TABLES_IN_TEXT_SECTION
 264 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 265
 266 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 267    than a doubleword should be padded upward or downward.  You could
 268    reasonably assume that they follow the normal rules for structure
 269    layout treating the parameter area as any other block of memory,
 270    then map the reg param area to registers.  i.e. pad upward.
 271    Setting both of the following defines results in this behavior.
 272    Setting just the first one will result in aggregates that fit in a
 273    doubleword being padded downward, and others being padded upward.
 274    Not a bad idea as this results in struct { int x; } being passed
 275    the same way as an int.  */
 276 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 277 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 278
 279 /* Specify padding for the last element of a block move between
 280    registers and memory.  FIRST is nonzero if this is the only
 281    element.  */
 282 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 283   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 284
 285 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 286    process.  */
 287 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 288
 289 #ifdef SINGLE_LIBC
 290 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
 291 #else
 292 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 293 #endif
 294
 295 /* Determine what functions are present at the runtime;
 296    this includes full c99 runtime and sincos.  */
 297 #undef TARGET_LIBC_HAS_FUNCTION
 298 #define TARGET_LIBC_HAS_FUNCTION linux_android_libc_has_function
 299
 300 #undef  TARGET_OS_CPP_BUILTINS
 301 #define TARGET_OS_CPP_BUILTINS()                        \
 302   do                                                    \
 303     {                                                   \
 304       if (TARGET_64BIT)                                 \
 305         {                                               \
 306           builtin_define ("__PPC__");                   \
 307           builtin_define ("__PPC64__");                 \
 308           builtin_define ("__powerpc__");               \
 309           builtin_define ("__powerpc64__");             \
 310           if (!DOT_SYMBOLS)                             \
 311             builtin_define ("_CALL_LINUX");             \
 312           builtin_assert ("cpu=powerpc64");             \
 313           builtin_assert ("machine=powerpc64");         \
 314         }                                               \
 315       else                                              \
 316         {                                               \
 317           builtin_define_std ("PPC");                   \
 318           builtin_define_std ("powerpc");               \
 319           builtin_assert ("cpu=powerpc");               \
 320           builtin_assert ("machine=powerpc");           \
 321           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 322         }                                               \
 323     }                                                   \
 324   while (0)
 325
 326 #undef  CPP_OS_DEFAULT_SPEC
 327 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 328
 329 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 330    defined on glibc-based systems. This temporary hack accomplishes this,
 331    it should go away as soon as libstdc++-v3 has a real fix.  */
 332 #undef  CPLUSPLUS_CPP_SPEC
 333 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 334
 335 #undef  LINK_SHLIB_SPEC
 336 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 337
 338 #undef  LIB_DEFAULT_SPEC
 339 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 340
 341 #undef  STARTFILE_DEFAULT_SPEC
 342 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 343
 344 #undef  ENDFILE_DEFAULT_SPEC
 345 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 346
 347 #undef  LINK_START_DEFAULT_SPEC
 348 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 349
 350 #undef  LINK_OS_DEFAULT_SPEC
 351 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 352
 353 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 354 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld64.so.1"
 355 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 356 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 357 #if DEFAULT_LIBC == LIBC_UCLIBC
 358 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
 359 #elif DEFAULT_LIBC == LIBC_GLIBC
 360 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
 361 #else
 362 #error "Unsupported DEFAULT_LIBC"
 363 #endif
 364 #define GNU_USER_DYNAMIC_LINKER32 \
 365   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
 366 #define GNU_USER_DYNAMIC_LINKER64 \
 367   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
 368
 369 #undef  DEFAULT_ASM_ENDIAN
 370 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
 371 #define DEFAULT_ASM_ENDIAN " -mlittle"
 372 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 373                                            " -m elf32lppclinux",        \
 374                                            " -m elf32lppclinux")
 375 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 376                                            " -m elf64lppc",             \
 377                                            " -m elf64lppc")
 378 #else
 379 #define DEFAULT_ASM_ENDIAN " -mbig"
 380 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 381                                            " -m elf32lppclinux",        \
 382                                            " -m elf32ppclinux")
 383 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 384                                            " -m elf64lppc",             \
 385                                            " -m elf64ppc")
 386 #endif
 387
 388 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
 389   %{rdynamic:-export-dynamic} \
 390   -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}"
 391
 392 #define LINK_OS_LINUX_SPEC64 LINK_OS_LINUX_EMUL64 " %{!shared: %{!static: \
 393   %{rdynamic:-export-dynamic} \
 394   -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}"
 395
 396 #undef  TOC_SECTION_ASM_OP
 397 #define TOC_SECTION_ASM_OP \
 398   (TARGET_64BIT                                         \
 399    ? "\t.section\t\".toc\",\"aw\""                      \
 400    : "\t.section\t\".got\",\"aw\"")
 401
 402 #undef  MINIMAL_TOC_SECTION_ASM_OP
 403 #define MINIMAL_TOC_SECTION_ASM_OP \
 404   (TARGET_64BIT                                         \
 405    ? "\t.section\t\".toc1\",\"aw\""                     \
 406    : ((TARGET_RELOCATABLE || flag_pic)                  \
 407       ? "\t.section\t\".got2\",\"aw\""                  \
 408       : "\t.section\t\".got1\",\"aw\""))
 409
 410 /* Must be at least as big as our pointer type.  */
 411 #undef  SIZE_TYPE
 412 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 413
 414 #undef  PTRDIFF_TYPE
 415 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 416
 417 #undef  WCHAR_TYPE
 418 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 419 #undef  WCHAR_TYPE_SIZE
 420 #define WCHAR_TYPE_SIZE 32
 421
 422 /* Override rs6000.h definition.  */
 423 #undef  ASM_APP_ON
 424 #define ASM_APP_ON "#APP\n"
 425
 426 /* Override rs6000.h definition.  */
 427 #undef  ASM_APP_OFF
 428 #define ASM_APP_OFF "#NO_APP\n"
 429
 430 #undef  RS6000_MCOUNT
 431 #define RS6000_MCOUNT "_mcount"
 432
 433 #ifdef __powerpc64__
 434 /* _init and _fini functions are built from bits spread across many
 435    object files, each potentially with a different TOC pointer.  For
 436    that reason, place a nop after the call so that the linker can
 437    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 438 #if DOT_SYMBOLS
 439 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 440   asm (SECTION_OP "\n"                                  \
 441 "       bl ." #FUNC "\n"                                \
 442 "       nop\n"                                          \
 443 "       .previous");
 444 #else
 445 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 446   asm (SECTION_OP "\n"                                  \
 447 "       bl " #FUNC "\n"                                 \
 448 "       nop\n"                                          \
 449 "       .previous");
 450 #endif
 451 #endif
 452
 453 /* FP save and restore routines.  */
 454 #undef  SAVE_FP_PREFIX
 455 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 456 #undef  SAVE_FP_SUFFIX
 457 #define SAVE_FP_SUFFIX ""
 458 #undef  RESTORE_FP_PREFIX
 459 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 460 #undef  RESTORE_FP_SUFFIX
 461 #define RESTORE_FP_SUFFIX ""
 462
 463 /* Dwarf2 debugging.  */
 464 #undef  PREFERRED_DEBUGGING_TYPE
 465 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 466
 467 /* This is how to declare the size of a function.  */
 468 #undef  ASM_DECLARE_FUNCTION_SIZE
 469 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 470   do                                                                    \
 471     {                                                                   \
 472       if (!flag_inhibit_size_directive)                                 \
 473         {                                                               \
 474           fputs ("\t.size\t", (FILE));                                  \
 475           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 476             putc ('.', (FILE));                                         \
 477           assemble_name ((FILE), (FNAME));                              \
 478           fputs (",.-", (FILE));                                        \
 479           rs6000_output_function_entry (FILE, FNAME);                   \
 480           putc ('\n', (FILE));                                          \
 481         }                                                               \
 482     }                                                                   \
 483   while (0)
 484
 485 /* Return nonzero if this entry is to be written into the constant
 486    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 487    or a CONST containing one of them.  If -mfp-in-toc (the default),
 488    we also do this for floating-point constants.  We actually can only
 489    do this if the FP formats of the target and host machines are the
 490    same, but we can't check that since not every file that uses
 491    the macros includes real.h.  We also do this when we can write the
 492    entry into the TOC and the entry is not larger than a TOC entry.  */
 493
 494 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 495 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 496   (TARGET_TOC                                                           \
 497    && (GET_CODE (X) == SYMBOL_REF                                       \
 498        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 499            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 500        || GET_CODE (X) == LABEL_REF                                     \
 501        || (GET_CODE (X) == CONST_INT                                    \
 502            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 503        || (GET_CODE (X) == CONST_DOUBLE                                 \
 504            && ((TARGET_64BIT                                            \
 505                 && (TARGET_MINIMAL_TOC                                  \
 506                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 507                         && ! TARGET_NO_FP_IN_TOC)))                     \
 508                || (!TARGET_64BIT                                        \
 509                    && !TARGET_NO_FP_IN_TOC                              \
 510                    && !TARGET_RELOCATABLE                               \
 511                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 512                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 513
 514 /* Select a format to encode pointers in exception handling data.  CODE
 515    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 516    true if the symbol may be affected by dynamic relocations.  */
 517 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 518 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 519   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 520    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 521       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 522    : DW_EH_PE_absptr)
 523
 524 /* For backward compatibility, we must continue to use the AIX
 525    structure return convention.  */
 526 #undef DRAFT_V4_STRUCT_RET
 527 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 528
 529 #define TARGET_POSIX_IO
 530
 531 #define LINK_GCC_C_SEQUENCE_SPEC \
 532   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 533
 534 /* Use --as-needed -lgcc_s for eh support.  */
 535 #ifdef HAVE_LD_AS_NEEDED
 536 #define USE_LD_AS_NEEDED 1
 537 #endif
 538
 539 #ifdef TARGET_LIBC_PROVIDES_SSP
 540 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 541    ppc64 glibc provides it at -0x7010(13).  */
 542 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 543 #endif
 544
 545 #define POWERPC_LINUX
 546
 547 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 548 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 549 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 550 #endif
 551
 552 /* Static stack checking is supported by means of probes.  */
 553 #define STACK_CHECK_STATIC_BUILTIN 1
 554
 555 /* The default value isn't sufficient in 64-bit mode.  */
 556 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)