gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 3, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GCC; see the file COPYING3.  If not see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef RS6000_BI_ARCH
  23
  24 #undef  DEFAULT_ABI
  25 #define DEFAULT_ABI ABI_AIX
  26
  27 #undef  TARGET_64BIT
  28 #define TARGET_64BIT 1
  29
  30 #define DEFAULT_ARCH64_P 1
  31 #define RS6000_BI_ARCH_P 0
  32
  33 #else
  34
  35 #define DEFAULT_ARCH64_P (TARGET_DEFAULT & MASK_64BIT)
  36 #define RS6000_BI_ARCH_P 1
  37
  38 #endif
  39
  40 #ifdef IN_LIBGCC2
  41 #undef TARGET_64BIT
  42 #ifdef __powerpc64__
  43 #define TARGET_64BIT 1
  44 #else
  45 #define TARGET_64BIT 0
  46 #endif
  47 #endif
  48
  49 #undef  TARGET_AIX
  50 #define TARGET_AIX TARGET_64BIT
  51
  52 #ifdef HAVE_LD_NO_DOT_SYMS
  53 /* New ABI uses a local sym for the function entry point.  */
  54 extern int dot_symbols;
  55 #undef DOT_SYMBOLS
  56 #define DOT_SYMBOLS dot_symbols
  57 #endif
  58
  59 #undef  PROCESSOR_DEFAULT
  60 #define PROCESSOR_DEFAULT PROCESSOR_POWER6
  61 #undef  PROCESSOR_DEFAULT64
  62 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER6
  63
  64 /* We don't need to generate entries in .fixup, except when
  65    -mrelocatable or -mrelocatable-lib is given.  */
  66 #undef RELOCATABLE_NEEDS_FIXUP
  67 #define RELOCATABLE_NEEDS_FIXUP \
  68   (target_flags & target_flags_explicit & MASK_RELOCATABLE)
  69
  70 #undef  RS6000_ABI_NAME
  71 #define RS6000_ABI_NAME "linux"
  72
  73 #define INVALID_64BIT "-m%s not supported in this configuration"
  74 #define INVALID_32BIT INVALID_64BIT
  75
  76 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  77 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  78   do                                                            \
  79     {                                                           \
  80       if (!rs6000_explicit_options.alignment)                   \
  81         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  82       if (TARGET_64BIT)                                         \
  83         {                                                       \
  84           if (DEFAULT_ABI != ABI_AIX)                           \
  85             {                                                   \
  86               rs6000_current_abi = ABI_AIX;                     \
  87               error (INVALID_64BIT, "call");                    \
  88             }                                                   \
  89           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
  90           if (target_flags & MASK_RELOCATABLE)                  \
  91             {                                                   \
  92               target_flags &= ~MASK_RELOCATABLE;                \
  93               error (INVALID_64BIT, "relocatable");             \
  94             }                                                   \
  95           if (target_flags & MASK_EABI)                         \
  96             {                                                   \
  97               target_flags &= ~MASK_EABI;                       \
  98               error (INVALID_64BIT, "eabi");                    \
  99             }                                                   \
 100           if (TARGET_PROTOTYPE)                                 \
 101             {                                                   \
 102               TARGET_PROTOTYPE = 0;                             \
 103               error (INVALID_64BIT, "prototype");               \
 104             }                                                   \
 105           if ((target_flags & MASK_POWERPC64) == 0)             \
 106             {                                                   \
 107               target_flags |= MASK_POWERPC64;                   \
 108               error ("-m64 requires a PowerPC64 cpu");          \
 109             }                                                   \
 110         }                                                       \
 111       else                                                      \
 112         {                                                       \
 113           if (!RS6000_BI_ARCH_P)                                \
 114             error (INVALID_32BIT, "32");                        \
 115           if (TARGET_PROFILE_KERNEL)                            \
 116             {                                                   \
 117               target_flags &= ~MASK_PROFILE_KERNEL;             \
 118               error (INVALID_32BIT, "profile-kernel");          \
 119             }                                                   \
 120         }                                                       \
 121     }                                                           \
 122   while (0)
 123
 124 #ifdef  RS6000_BI_ARCH
 125
 126 #undef  OVERRIDE_OPTIONS
 127 #define OVERRIDE_OPTIONS \
 128   rs6000_override_options (((TARGET_DEFAULT ^ target_flags) & MASK_64BIT) \
 129                            ? (char *) 0 : TARGET_CPU_DEFAULT)
 130
 131 #endif
 132
 133 #undef  ASM_DEFAULT_SPEC
 134 #undef  ASM_SPEC
 135 #undef  LINK_OS_LINUX_SPEC
 136
 137 #ifndef RS6000_BI_ARCH
 138 #define ASM_DEFAULT_SPEC "-mppc64"
 139 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 140 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 141 #else
 142 #if DEFAULT_ARCH64_P
 143 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 144 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 145 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 146 #else
 147 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 148 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 149 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 150 #endif
 151 #endif
 152
 153 #define ASM_SPEC32 "-a32 %{n} %{T} %{Ym,*} %{Yd,*} \
 154 %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} \
 155 %{memb} %{!memb: %{msdata: -memb} %{msdata=eabi: -memb}} \
 156 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 157     %{mcall-freebsd: -mbig} \
 158     %{mcall-i960-old: -mlittle} \
 159     %{mcall-linux: -mbig} \
 160     %{mcall-gnu: -mbig} \
 161     %{mcall-netbsd: -mbig} \
 162 }}}}"
 163
 164 #define ASM_SPEC64 "-a64"
 165
 166 #define ASM_SPEC_COMMON "%(asm_cpu) \
 167 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
 168 %{v:-V} %{Qy:} %{!Qn:-Qy} %{Wa,*:%*} \
 169 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 170
 171 #undef  SUBSUBTARGET_EXTRA_SPECS
 172 #define SUBSUBTARGET_EXTRA_SPECS \
 173   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 174   { "asm_spec32",               ASM_SPEC32 },                           \
 175   { "asm_spec64",               ASM_SPEC64 },                           \
 176   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 177   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 178
 179 #undef  MULTILIB_DEFAULTS
 180 #if DEFAULT_ARCH64_P
 181 #define MULTILIB_DEFAULTS { "m64" }
 182 #else
 183 #define MULTILIB_DEFAULTS { "m32" }
 184 #endif
 185
 186 #ifndef RS6000_BI_ARCH
 187
 188 /* 64-bit PowerPC Linux is always big-endian.  */
 189 #undef  TARGET_LITTLE_ENDIAN
 190 #define TARGET_LITTLE_ENDIAN    0
 191
 192 /* 64-bit PowerPC Linux always has a TOC.  */
 193 #undef  TARGET_TOC
 194 #define TARGET_TOC              1
 195
 196 /* Some things from sysv4.h we don't do when 64 bit.  */
 197 #undef  TARGET_RELOCATABLE
 198 #define TARGET_RELOCATABLE      0
 199 #undef  TARGET_EABI
 200 #define TARGET_EABI             0
 201 #undef  TARGET_PROTOTYPE
 202 #define TARGET_PROTOTYPE        0
 203 #undef RELOCATABLE_NEEDS_FIXUP
 204 #define RELOCATABLE_NEEDS_FIXUP 0
 205
 206 #endif
 207
 208 /* We use glibc _mcount for profiling.  */
 209 #define NO_PROFILE_COUNTERS 1
 210 #define PROFILE_HOOK(LABEL) \
 211   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 212
 213 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 214 #undef  ADJUST_FIELD_ALIGN
 215 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 216   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 217    ? 128                                                                \
 218    : (TARGET_64BIT                                                      \
 219       && TARGET_ALIGN_NATURAL == 0                                      \
 220       && TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE         \
 221                     ? get_inner_array_type (FIELD)                      \
 222                     : TREE_TYPE (FIELD)) == DFmode)                     \
 223    ? MIN ((COMPUTED), 32)                                               \
 224    : (COMPUTED))
 225
 226 /* PowerPC64 Linux increases natural record alignment to doubleword if
 227    the first field is an FP double, only if in power alignment mode.  */
 228 #undef  ROUND_TYPE_ALIGN
 229 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 230   ((TARGET_64BIT                                                        \
 231     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 232         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 233         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 234     && TARGET_ALIGN_NATURAL == 0)                                       \
 235    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 236    : MAX ((COMPUTED), (SPECIFIED)))
 237
 238 /* Use the default for compiling target libs.  */
 239 #ifdef IN_TARGET_LIBS
 240 #undef TARGET_ALIGN_NATURAL
 241 #define TARGET_ALIGN_NATURAL 1
 242 #endif
 243
 244 /* Indicate that jump tables go in the text section.  */
 245 #undef  JUMP_TABLES_IN_TEXT_SECTION
 246 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 247
 248 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 249    than a doubleword should be padded upward or downward.  You could
 250    reasonably assume that they follow the normal rules for structure
 251    layout treating the parameter area as any other block of memory,
 252    then map the reg param area to registers.  i.e. pad upward.
 253    Setting both of the following defines results in this behavior.
 254    Setting just the first one will result in aggregates that fit in a
 255    doubleword being padded downward, and others being padded upward.
 256    Not a bad idea as this results in struct { int x; } being passed
 257    the same way as an int.  */
 258 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 259 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 260
 261 /* Specify padding for the last element of a block move between
 262    registers and memory.  FIRST is nonzero if this is the only
 263    element.  */
 264 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 265   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 266
 267 /* __throw will restore its own return address to be the same as the
 268    return address of the function that the throw is being made to.
 269    This is unfortunate, because we want to check the original
 270    return address to see if we need to restore the TOC.
 271    So we have to squirrel it away with this.  */
 272 #define SETUP_FRAME_ADDRESSES() \
 273   do { if (TARGET_64BIT) rs6000_aix_emit_builtin_unwind_init (); } while (0)
 274
 275 /* Override svr4.h  */
 276 #undef MD_EXEC_PREFIX
 277 #undef MD_STARTFILE_PREFIX
 278
 279 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 280    process.  */
 281 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 282
 283 /* glibc has float and long double forms of math functions.  */
 284 #undef  TARGET_C99_FUNCTIONS
 285 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
 286
 287 /* Whether we have sincos that follows the GNU extension.  */
 288 #undef  TARGET_HAS_SINCOS
 289 #define TARGET_HAS_SINCOS (OPTION_GLIBC)
 290
 291 #undef  TARGET_OS_CPP_BUILTINS
 292 #define TARGET_OS_CPP_BUILTINS()                        \
 293   do                                                    \
 294     {                                                   \
 295       if (TARGET_64BIT)                                 \
 296         {                                               \
 297           builtin_define ("__PPC__");                   \
 298           builtin_define ("__PPC64__");                 \
 299           builtin_define ("__powerpc__");               \
 300           builtin_define ("__powerpc64__");             \
 301           builtin_assert ("cpu=powerpc64");             \
 302           builtin_assert ("machine=powerpc64");         \
 303         }                                               \
 304       else                                              \
 305         {                                               \
 306           builtin_define_std ("PPC");                   \
 307           builtin_define_std ("powerpc");               \
 308           builtin_assert ("cpu=powerpc");               \
 309           builtin_assert ("machine=powerpc");           \
 310           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 311         }                                               \
 312     }                                                   \
 313   while (0)
 314
 315 #undef  CPP_OS_DEFAULT_SPEC
 316 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 317
 318 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 319    defined on glibc-based systems. This temporary hack accomplishes this,
 320    it should go away as soon as libstdc++-v3 has a real fix.  */
 321 #undef  CPLUSPLUS_CPP_SPEC
 322 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 323
 324 #undef  LINK_SHLIB_SPEC
 325 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 326
 327 #undef  LIB_DEFAULT_SPEC
 328 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 329
 330 #undef  STARTFILE_DEFAULT_SPEC
 331 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 332
 333 #undef  ENDFILE_DEFAULT_SPEC
 334 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 335
 336 #undef  LINK_START_DEFAULT_SPEC
 337 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 338
 339 #undef  LINK_OS_DEFAULT_SPEC
 340 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 341
 342 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 343 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld64.so.1"
 344 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 345 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 346 #if UCLIBC_DEFAULT
 347 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:%{muclibc:%e-mglibc and -muclibc used together}" G ";:" U "}"
 348 #else
 349 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:%{mglibc:%e-mglibc and -muclibc used together}" U ";:" G "}"
 350 #endif
 351 #define LINUX_DYNAMIC_LINKER32 \
 352   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
 353 #define LINUX_DYNAMIC_LINKER64 \
 354   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
 355
 356
 357 #define LINK_OS_LINUX_SPEC32 "-m elf32ppclinux %{!shared: %{!static: \
 358   %{rdynamic:-export-dynamic} \
 359   %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER32 "}}}"
 360
 361 #define LINK_OS_LINUX_SPEC64 "-m elf64ppc %{!shared: %{!static: \
 362   %{rdynamic:-export-dynamic} \
 363   %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER64 "}}}"
 364
 365 #undef  TOC_SECTION_ASM_OP
 366 #define TOC_SECTION_ASM_OP \
 367   (TARGET_64BIT                                         \
 368    ? "\t.section\t\".toc\",\"aw\""                      \
 369    : "\t.section\t\".got\",\"aw\"")
 370
 371 #undef  MINIMAL_TOC_SECTION_ASM_OP
 372 #define MINIMAL_TOC_SECTION_ASM_OP \
 373   (TARGET_64BIT                                         \
 374    ? "\t.section\t\".toc1\",\"aw\""                     \
 375    : ((TARGET_RELOCATABLE || flag_pic)                  \
 376       ? "\t.section\t\".got2\",\"aw\""                  \
 377       : "\t.section\t\".got1\",\"aw\""))
 378
 379 #undef  TARGET_VERSION
 380 #define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
 381
 382 /* Must be at least as big as our pointer type.  */
 383 #undef  SIZE_TYPE
 384 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 385
 386 #undef  PTRDIFF_TYPE
 387 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 388
 389 #undef  WCHAR_TYPE
 390 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 391 #undef  WCHAR_TYPE_SIZE
 392 #define WCHAR_TYPE_SIZE 32
 393
 394 /* Override rs6000.h definition.  */
 395 #undef  ASM_APP_ON
 396 #define ASM_APP_ON "#APP\n"
 397
 398 /* Override rs6000.h definition.  */
 399 #undef  ASM_APP_OFF
 400 #define ASM_APP_OFF "#NO_APP\n"
 401
 402 /* PowerPC no-op instruction.  */
 403 #undef  RS6000_CALL_GLUE
 404 #define RS6000_CALL_GLUE (TARGET_64BIT ? "nop" : "cror 31,31,31")
 405
 406 #undef  RS6000_MCOUNT
 407 #define RS6000_MCOUNT "_mcount"
 408
 409 #ifdef __powerpc64__
 410 /* _init and _fini functions are built from bits spread across many
 411    object files, each potentially with a different TOC pointer.  For
 412    that reason, place a nop after the call so that the linker can
 413    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 414 #if DOT_SYMBOLS
 415 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 416   asm (SECTION_OP "\n"                                  \
 417 "       bl ." #FUNC "\n"                                \
 418 "       nop\n"                                          \
 419 "       .previous");
 420 #else
 421 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 422   asm (SECTION_OP "\n"                                  \
 423 "       bl " #FUNC "\n"                                 \
 424 "       nop\n"                                          \
 425 "       .previous");
 426 #endif
 427 #endif
 428
 429 /* FP save and restore routines.  */
 430 #undef  SAVE_FP_PREFIX
 431 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 432 #undef  SAVE_FP_SUFFIX
 433 #define SAVE_FP_SUFFIX (TARGET_64BIT ? "" : "_l")
 434 #undef  RESTORE_FP_PREFIX
 435 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 436 #undef  RESTORE_FP_SUFFIX
 437 #define RESTORE_FP_SUFFIX (TARGET_64BIT ? "" : "_l")
 438
 439 /* Dwarf2 debugging.  */
 440 #undef  PREFERRED_DEBUGGING_TYPE
 441 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 442
 443 /* This is how to declare the size of a function.  */
 444 #undef  ASM_DECLARE_FUNCTION_SIZE
 445 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 446   do                                                                    \
 447     {                                                                   \
 448       if (!flag_inhibit_size_directive)                                 \
 449         {                                                               \
 450           fputs ("\t.size\t", (FILE));                                  \
 451           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 452             putc ('.', (FILE));                                         \
 453           assemble_name ((FILE), (FNAME));                              \
 454           fputs (",.-", (FILE));                                        \
 455           rs6000_output_function_entry (FILE, FNAME);                   \
 456           putc ('\n', (FILE));                                          \
 457         }                                                               \
 458     }                                                                   \
 459   while (0)
 460
 461 /* Return nonzero if this entry is to be written into the constant
 462    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 463    or a CONST containing one of them.  If -mfp-in-toc (the default),
 464    we also do this for floating-point constants.  We actually can only
 465    do this if the FP formats of the target and host machines are the
 466    same, but we can't check that since not every file that uses
 467    GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  We also do this when
 468    we can write the entry into the TOC and the entry is not larger
 469    than a TOC entry.  */
 470
 471 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 472 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 473   (TARGET_TOC                                                           \
 474    && (GET_CODE (X) == SYMBOL_REF                                       \
 475        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 476            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 477        || GET_CODE (X) == LABEL_REF                                     \
 478        || (GET_CODE (X) == CONST_INT                                    \
 479            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 480        || (GET_CODE (X) == CONST_DOUBLE                                 \
 481            && ((TARGET_64BIT                                            \
 482                 && (TARGET_POWERPC64                                    \
 483                     || TARGET_MINIMAL_TOC                               \
 484                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 485                         && ! TARGET_NO_FP_IN_TOC)))                     \
 486                || (!TARGET_64BIT                                        \
 487                    && !TARGET_NO_FP_IN_TOC                              \
 488                    && !TARGET_RELOCATABLE                               \
 489                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 490                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 491
 492 /* Select a format to encode pointers in exception handling data.  CODE
 493    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 494    true if the symbol may be affected by dynamic relocations.  */
 495 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 496 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 497   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 498    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 499       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 500    : DW_EH_PE_absptr)
 501
 502 /* For backward compatibility, we must continue to use the AIX
 503    structure return convention.  */
 504 #undef DRAFT_V4_STRUCT_RET
 505 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 506
 507 #define TARGET_ASM_FILE_END rs6000_elf_end_indicate_exec_stack
 508
 509 #define TARGET_POSIX_IO
 510
 511 #define LINK_GCC_C_SEQUENCE_SPEC \
 512   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 513
 514 /* Use --as-needed -lgcc_s for eh support.  */
 515 #ifdef HAVE_LD_AS_NEEDED
 516 #define USE_LD_AS_NEEDED 1
 517 #endif
 518
 519 #define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"
 520
 521 #ifdef TARGET_LIBC_PROVIDES_SSP
 522 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 523    ppc64 glibc provides it at -0x7010(13).  */
 524 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 525 #endif
 526
 527 #define POWERPC_LINUX
 528
 529 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 530 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 531 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 532 #endif